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"
71 #include "langhooks.h"
73 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
74 #include "dwarf2out.h"
77 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
81 #ifdef SDB_DEBUGGING_INFO
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
95 /* The extra parameters substantially improve the I/O performance. */
98 vms_fopen (fname
, type
)
102 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
103 fixed arguments, which matches ANSI's specification but not VAXCRTL's
104 pre-ANSI implementation. This hack circumvents the mismatch problem. */
105 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
108 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
109 "deq=64", "fop=tef", "shr=nil");
111 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
114 #define fopen vms_fopen
117 #ifndef DEFAULT_GDB_EXTENSIONS
118 #define DEFAULT_GDB_EXTENSIONS 1
121 /* If more than one debugging type is supported, you must define
122 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
124 This is one long line cause VAXC can't handle a \-newline. */
125 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
126 #ifndef PREFERRED_DEBUGGING_TYPE
127 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
128 #endif /* no PREFERRED_DEBUGGING_TYPE */
129 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
130 so the following code needn't care. */
131 #ifdef DBX_DEBUGGING_INFO
132 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
134 #ifdef SDB_DEBUGGING_INFO
135 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
137 #ifdef DWARF_DEBUGGING_INFO
138 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
140 #ifdef DWARF2_DEBUGGING_INFO
141 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
143 #ifdef XCOFF_DEBUGGING_INFO
144 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
146 #endif /* More than one debugger format enabled. */
148 /* If still not defined, must have been because no debugging formats
150 #ifndef PREFERRED_DEBUGGING_TYPE
151 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
154 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
155 extern char **environ
;
158 /* Carry information from ASM_DECLARE_OBJECT_NAME
159 to ASM_FINISH_DECLARE_OBJECT. */
161 extern int size_directive_output
;
162 extern tree last_assemble_variable_decl
;
164 static void general_init
PARAMS ((char *));
165 static void parse_options_and_default_flags
PARAMS ((int, char **));
166 static void process_options
PARAMS ((void));
167 static void lang_independent_init
PARAMS ((void));
168 static void lang_dependent_init
PARAMS ((const char *));
169 static void init_asm_output
PARAMS ((const char *));
171 static void set_target_switch
PARAMS ((const char *));
172 static const char *decl_name
PARAMS ((tree
, int));
174 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
175 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
176 static void set_float_handler
PARAMS ((jmp_buf));
177 static void compile_file
PARAMS ((void));
178 static void display_help
PARAMS ((void));
179 static void display_target_options
PARAMS ((void));
181 static void decode_d_option
PARAMS ((const char *));
182 static int decode_f_option
PARAMS ((const char *));
183 static int decode_W_option
PARAMS ((const char *));
184 static int decode_g_option
PARAMS ((const char *));
185 static unsigned int independent_decode_option
PARAMS ((int, char **));
187 static void print_version
PARAMS ((FILE *, const char *));
188 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
189 const char *, const char *,
190 const char *, const char *));
191 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
192 const char *, const char *));
194 /* Length of line when printing switch values. */
197 /* Name of program invoked, sans directories. */
199 const char *progname
;
201 /* Copy of arguments to toplev_main. */
205 /* Name of current original source file (what was input to cpp).
206 This comes from each #-command in the actual input. */
208 const char *input_filename
;
210 /* Name of top-level original source file (what was input to cpp).
211 This comes from the #-command at the beginning of the actual input.
212 If there isn't any there, then this is the cc1 input file name. */
214 const char *main_input_filename
;
216 /* Current line number in real source file. */
220 /* Nonzero if it is unsafe to create any new pseudo registers. */
223 /* Stack of currently pending input files. */
225 struct file_stack
*input_file_stack
;
227 /* Incremented on each change to input_file_stack. */
228 int input_file_stack_tick
;
230 /* Name to use as base of names for dump output files. */
232 const char *dump_base_name
;
234 /* Bit flags that specify the machine subtype we are compiling for.
235 Bits are tested using macros TARGET_... defined in the tm.h file
236 and set by `-m...' switches. Must be defined in rtlanal.c. */
238 extern int target_flags
;
240 /* Debug hooks - dependent upon command line options. */
242 struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
244 /* Describes a dump file. */
246 struct dump_file_info
248 /* The unique extension to apply, e.g. ".jump". */
249 const char *const extension
;
251 /* The -d<c> character that enables this dump file. */
252 char const debug_switch
;
254 /* True if there is a corresponding graph dump file. */
255 char const graph_dump_p
;
257 /* True if the user selected this dump. */
260 /* True if the files have been initialized (ie truncated). */
264 /* Enumerate the extant dump files. */
303 /* Describes all the dump files. Should be kept in order of the
304 pass and in sync with dump_file_index above.
306 Remaining -d letters:
312 struct dump_file_info dump_file
[DFI_MAX
] =
314 { "rtl", 'r', 0, 0, 0 },
315 { "sibling", 'i', 0, 0, 0 },
316 { "eh", 'h', 0, 0, 0 },
317 { "jump", 'j', 0, 0, 0 },
318 { "ssa", 'e', 1, 0, 0 },
319 { "ssaccp", 'W', 1, 0, 0 },
320 { "ssadce", 'X', 1, 0, 0 },
321 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
322 { "cse", 's', 0, 0, 0 },
323 { "addressof", 'F', 0, 0, 0 },
324 { "gcse", 'G', 1, 0, 0 },
325 { "loop", 'L', 1, 0, 0 },
326 { "cse2", 't', 1, 0, 0 },
327 { "cfg", 'f', 1, 0, 0 },
328 { "bp", 'b', 1, 0, 0 },
329 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
330 { "combine", 'c', 1, 0, 0 },
331 { "ce", 'C', 1, 0, 0 },
332 { "regmove", 'N', 1, 0, 0 },
333 { "sched", 'S', 1, 0, 0 },
334 { "lreg", 'l', 1, 0, 0 },
335 { "greg", 'g', 1, 0, 0 },
336 { "postreload", 'o', 1, 0, 0 },
337 { "flow2", 'w', 1, 0, 0 },
338 { "peephole2", 'z', 1, 0, 0 },
339 { "rnreg", 'n', 1, 0, 0 },
340 { "ce2", 'E', 1, 0, 0 },
341 { "sched2", 'R', 1, 0, 0 },
342 { "stack", 'k', 1, 0, 0 },
343 { "bbro", 'B', 1, 0, 0 },
344 { "mach", 'M', 1, 0, 0 },
345 { "dbr", 'd', 0, 0, 0 },
348 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
349 static void close_dump_file
PARAMS ((enum dump_file_index
,
350 void (*) (FILE *, rtx
), rtx
));
352 /* Other flags saying which kinds of debugging dump have been requested. */
354 int rtl_dump_and_exit
;
355 int flag_print_asm_name
;
356 static int version_flag
;
357 static char *filename
;
358 enum graph_dump_types graph_dump_format
;
360 /* Name for output file of assembly code, specified with -o. */
364 /* Value of the -G xx switch, and whether it was passed or not. */
368 /* Type(s) of debugging information we are producing (if any).
369 See flags.h for the definitions of the different possible
370 types of debugging information. */
371 enum debug_info_type write_symbols
= NO_DEBUG
;
373 /* Level of debugging information we are producing. See flags.h
374 for the definitions of the different possible levels. */
375 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
377 /* Nonzero means use GNU-only extensions in the generated symbolic
378 debugging information. */
379 /* Currently, this only has an effect when write_symbols is set to
380 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
381 int use_gnu_debug_info_extensions
= 0;
383 /* Nonzero means do optimizations. -O.
384 Particular numeric values stand for particular amounts of optimization;
385 thus, -O2 stores 2 here. However, the optimizations beyond the basic
386 ones are not controlled directly by this variable. Instead, they are
387 controlled by individual `flag_...' variables that are defaulted
388 based on this variable. */
392 /* Nonzero means optimize for size. -Os.
393 The only valid values are zero and non-zero. When optimize_size is
394 non-zero, optimize defaults to 2, but certain individual code
395 bloating optimizations are disabled. */
397 int optimize_size
= 0;
399 /* Nonzero if we should exit after parsing options. */
400 static int exit_after_options
= 0;
402 /* The FUNCTION_DECL for the function currently being compiled,
403 or 0 if between functions. */
404 tree current_function_decl
;
406 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
408 tree current_function_func_begin_label
;
410 /* Pointer to function to compute the name to use to print a declaration.
411 DECL is the declaration in question.
412 VERBOSITY determines what information will be printed:
413 0: DECL_NAME, demangled as necessary.
414 1: and scope information.
415 2: and any other information that might be interesting, such as function
416 parameter types in C++. */
418 const char *(*decl_printable_name
) PARAMS ((tree
, int));
420 /* Pointer to function to compute rtl for a language-specific tree code. */
422 typedef rtx (*lang_expand_expr_t
)
423 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
424 enum expand_modifier modifier
));
426 lang_expand_expr_t lang_expand_expr
= 0;
428 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
430 /* Pointer to function to finish handling an incomplete decl at the
431 end of compilation. */
433 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
435 /* Nonzero if doing dwarf2 duplicate elimination. */
437 int flag_eliminate_dwarf2_dups
= 0;
439 /* Nonzero if generating code to do profiling. */
441 int profile_flag
= 0;
443 /* Nonzero if generating code to do profiling on a line-by-line basis. */
445 int profile_block_flag
;
447 /* Nonzero if generating code to profile program flow graph arcs. */
449 int profile_arc_flag
= 0;
451 /* Nonzero if generating info for gcov to calculate line test coverage. */
453 int flag_test_coverage
= 0;
455 /* Nonzero indicates that branch taken probabilities should be calculated. */
457 int flag_branch_probabilities
= 0;
459 /* Nonzero if basic blocks should be reordered. */
461 int flag_reorder_blocks
= 0;
463 /* Nonzero if registers should be renamed. */
465 int flag_rename_registers
= 0;
467 /* Nonzero for -pedantic switch: warn about anything
468 that standard spec forbids. */
472 /* Temporarily suppress certain warnings.
473 This is set while reading code from a system header file. */
475 int in_system_header
= 0;
477 /* Don't print functions as they are compiled. -quiet. */
481 /* Print times taken by the various passes. -ftime-report. */
485 /* Print memory still in use at end of compilation (which may have little
486 to do with peak memory consumption). -fmem-report. */
490 /* Non-zero means to collect statistics which might be expensive
491 and to print them when we are done. */
492 int flag_detailed_statistics
= 0;
497 /* Nonzero means `char' should be signed. */
499 int flag_signed_char
;
501 /* Nonzero means give an enum type only as many bytes as it needs. */
503 int flag_short_enums
;
505 /* Nonzero for -fcaller-saves: allocate values in regs that need to
506 be saved across function calls, if that produces overall better code.
507 Optional now, so people can test it. */
509 #ifdef DEFAULT_CALLER_SAVES
510 int flag_caller_saves
= 1;
512 int flag_caller_saves
= 0;
515 /* Nonzero if structures and unions should be returned in memory.
517 This should only be defined if compatibility with another compiler or
518 with an ABI is needed, because it results in slower code. */
520 #ifndef DEFAULT_PCC_STRUCT_RETURN
521 #define DEFAULT_PCC_STRUCT_RETURN 1
524 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
526 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
528 /* Nonzero for -fforce-mem: load memory value into a register
529 before arithmetic on it. This makes better cse but slower compilation. */
531 int flag_force_mem
= 0;
533 /* Nonzero for -fforce-addr: load memory address into a register before
534 reference to memory. This makes better cse but slower compilation. */
536 int flag_force_addr
= 0;
538 /* Nonzero for -fdefer-pop: don't pop args after each function call;
539 instead save them up to pop many calls' args with one insns. */
541 int flag_defer_pop
= 0;
543 /* Nonzero for -ffloat-store: don't allocate floats and doubles
544 in extended-precision registers. */
546 int flag_float_store
= 0;
548 /* Nonzero for -fcse-follow-jumps:
549 have cse follow jumps to do a more extensive job. */
551 int flag_cse_follow_jumps
;
553 /* Nonzero for -fcse-skip-blocks:
554 have cse follow a branch around a block. */
555 int flag_cse_skip_blocks
;
557 /* Nonzero for -fexpensive-optimizations:
558 perform miscellaneous relatively-expensive optimizations. */
559 int flag_expensive_optimizations
;
561 /* Nonzero for -fthread-jumps:
562 have jump optimize output of loop. */
564 int flag_thread_jumps
;
566 /* Nonzero enables strength-reduction in loop.c. */
568 int flag_strength_reduce
= 0;
570 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
571 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
572 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
575 int flag_unroll_loops
;
577 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
578 This is generally not a win. */
580 int flag_unroll_all_loops
;
582 /* Nonzero forces all invariant computations in loops to be moved
585 int flag_move_all_movables
= 0;
587 /* Nonzero forces all general induction variables in loops to be
590 int flag_reduce_all_givs
= 0;
592 /* Nonzero to perform full register move optimization passes. This is the
595 int flag_regmove
= 0;
597 /* Nonzero for -fwritable-strings:
598 store string constants in data segment and don't uniquize them. */
600 int flag_writable_strings
= 0;
602 /* Nonzero means don't put addresses of constant functions in registers.
603 Used for compiling the Unix kernel, where strange substitutions are
604 done on the assembly output. */
606 int flag_no_function_cse
= 0;
608 /* Nonzero for -fomit-frame-pointer:
609 don't make a frame pointer in simple functions that don't require one. */
611 int flag_omit_frame_pointer
= 0;
613 /* Nonzero means place each function into its own section on those platforms
614 which support arbitrary section names and unlimited numbers of sections. */
616 int flag_function_sections
= 0;
618 /* ... and similar for data. */
620 int flag_data_sections
= 0;
622 /* Nonzero to inhibit use of define_optimization peephole opts. */
624 int flag_no_peephole
= 0;
626 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
628 int flag_optimize_sibling_calls
= 0;
630 /* Nonzero means the front end generally wants `errno' maintained by math
631 operations, like built-in SQRT. */
633 int flag_errno_math
= 1;
635 /* Nonzero means that unsafe floating-point math optimizations are allowed
636 for the sake of speed. IEEE compliance is not guaranteed, and operations
637 are allowed to assume that their arguments and results are "normal"
638 (e.g., nonnegative for SQRT). */
640 int flag_unsafe_math_optimizations
= 0;
642 /* Zero means that floating-point math operations cannot generate a
643 (user-visible) trap. This is the case, for example, in nonstop
644 IEEE 754 arithmetic. */
646 int flag_trapping_math
= 1;
648 /* 0 means straightforward implementation of complex divide acceptable.
649 1 means wide ranges of inputs must work for complex divide.
650 2 means C99-like requirements for complex divide (not yet implemented). */
652 int flag_complex_divide_method
= 0;
654 /* Nonzero means all references through pointers are volatile. */
658 /* Nonzero means treat all global and extern variables as volatile. */
660 int flag_volatile_global
;
662 /* Nonzero means treat all static variables as volatile. */
664 int flag_volatile_static
;
666 /* Nonzero means just do syntax checking; don't output anything. */
668 int flag_syntax_only
= 0;
670 /* Nonzero means perform global cse. */
672 static int flag_gcse
;
674 /* Nonzero means to use global dataflow analysis to eliminate
675 useless null pointer tests. */
677 static int flag_delete_null_pointer_checks
;
679 /* Nonzero means to do the enhanced load motion during gcse, which trys
680 to hoist loads by not killing them when a store to the same location
683 int flag_gcse_lm
= 1;
685 /* Nonzero means to perform store motion after gcse, which will try to
686 move stores closer to the exit block. Its not very effective without
689 int flag_gcse_sm
= 1;
691 /* Nonzero means to rerun cse after loop optimization. This increases
692 compilation time about 20% and picks up a few more common expressions. */
694 static int flag_rerun_cse_after_loop
;
696 /* Nonzero means to run loop optimizations twice. */
698 int flag_rerun_loop_opt
;
700 /* Nonzero for -finline-functions: ok to inline functions that look like
701 good inline candidates. */
703 int flag_inline_functions
;
705 /* Nonzero for -fkeep-inline-functions: even if we make a function
706 go inline everywhere, keep its definition around for debugging
709 int flag_keep_inline_functions
;
711 /* Nonzero means that functions will not be inlined. */
715 /* Nonzero means that we should emit static const variables
716 regardless of whether or not optimization is turned on. */
718 int flag_keep_static_consts
= 1;
720 /* Nonzero means we should be saving declaration info into a .X file. */
722 int flag_gen_aux_info
= 0;
724 /* Specified name of aux-info file. */
726 static char *aux_info_file_name
;
728 /* Nonzero means make the text shared if supported. */
730 int flag_shared_data
;
732 /* Nonzero means schedule into delayed branch slots if supported. */
734 int flag_delayed_branch
;
736 /* Nonzero if we are compiling pure (sharable) code.
737 Value is 1 if we are doing reasonable (i.e. simple
738 offset into offset table) pic. Value is 2 if we can
739 only perform register offsets. */
743 /* Nonzero means generate extra code for exception handling and enable
744 exception handling. */
748 /* Nonzero means generate frame unwind info table when supported. */
750 int flag_unwind_tables
= 0;
752 /* Nonzero means generate frame unwind info table exact at each insn boundary */
754 int flag_asynchronous_unwind_tables
= 0;
756 /* Nonzero means don't place uninitialized global data in common storage
761 /* Nonzero means pretend it is OK to examine bits of target floats,
762 even if that isn't true. The resulting code will have incorrect constants,
763 but the same series of instructions that the native compiler would make. */
765 int flag_pretend_float
;
767 /* Nonzero means change certain warnings into errors.
768 Usually these are warnings about failure to conform to some standard. */
770 int flag_pedantic_errors
= 0;
772 /* flag_schedule_insns means schedule insns within basic blocks (before
774 flag_schedule_insns_after_reload means schedule insns after
777 int flag_schedule_insns
= 0;
778 int flag_schedule_insns_after_reload
= 0;
780 /* The following flags have effect only for scheduling before register
783 flag_schedule_interblock means schedule insns accross basic blocks.
784 flag_schedule_speculative means allow speculative motion of non-load insns.
785 flag_schedule_speculative_load means allow speculative motion of some
787 flag_schedule_speculative_load_dangerous allows speculative motion of more
790 int flag_schedule_interblock
= 1;
791 int flag_schedule_speculative
= 1;
792 int flag_schedule_speculative_load
= 0;
793 int flag_schedule_speculative_load_dangerous
= 0;
795 int flag_single_precision_constant
;
797 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
798 by a cheaper branch on a count register. */
799 int flag_branch_on_count_reg
= 1;
801 /* -finhibit-size-directive inhibits output of .size for ELF.
802 This is used only for compiling crtstuff.c,
803 and it may be extended to other effects
804 needed for crtstuff.c on other systems. */
805 int flag_inhibit_size_directive
= 0;
807 /* -fverbose-asm causes extra commentary information to be produced in
808 the generated assembly code (to make it more readable). This option
809 is generally only of use to those who actually need to read the
810 generated assembly code (perhaps while debugging the compiler itself).
811 -fno-verbose-asm, the default, causes the extra information
812 to be omitted and is useful when comparing two assembler files. */
814 int flag_verbose_asm
= 0;
816 /* -dA causes debug commentary information to be produced in
817 the generated assembly code (to make it more readable). This option
818 is generally only of use to those who actually need to read the
819 generated assembly code (perhaps while debugging the compiler itself).
820 Currently, this switch is only used by dwarfout.c; however, it is intended
821 to be a catchall for printing debug information in the assembler file. */
823 int flag_debug_asm
= 0;
825 /* -dP causes the rtl to be emitted as a comment in assembly. */
827 int flag_dump_rtl_in_asm
= 0;
829 /* -fgnu-linker specifies use of the GNU linker for initializations.
830 (Or, more generally, a linker that handles initializations.)
831 -fno-gnu-linker says that collect2 will be used. */
833 int flag_gnu_linker
= 0;
835 int flag_gnu_linker
= 1;
841 /* Enable ssa conditional constant propagation. */
842 int flag_ssa_ccp
= 0;
844 /* Enable ssa aggressive dead code elimination. */
845 int flag_ssa_dce
= 0;
847 /* Tag all structures with __attribute__(packed). */
848 int flag_pack_struct
= 0;
850 /* Emit code to check for stack overflow; also may cause large objects
851 to be allocated dynamically. */
852 int flag_stack_check
;
854 /* When non-NULL, indicates that whenever space is allocated on the
855 stack, the resulting stack pointer must not pass this
856 address---that is, for stacks that grow downward, the stack pointer
857 must always be greater than or equal to this address; for stacks
858 that grow upward, the stack pointer must be less than this address.
859 At present, the rtx may be either a REG or a SYMBOL_REF, although
860 the support provided depends on the backend. */
863 /* -fcheck-memory-usage causes extra code to be generated in order to check
864 memory accesses. This is used by a detector of bad memory accesses such
866 int flag_check_memory_usage
= 0;
868 /* -fprefix-function-name causes function name to be prefixed. This
869 can be used with -fcheck-memory-usage to isolate code compiled with
870 -fcheck-memory-usage. */
871 int flag_prefix_function_name
= 0;
873 /* 0 if pointer arguments may alias each other. True in C.
874 1 if pointer arguments may not alias each other but may alias
876 2 if pointer arguments may not alias each other and may not
877 alias global variables. True in Fortran.
878 This defaults to 0 for C. */
879 int flag_argument_noalias
= 0;
881 /* Nonzero if we should do (language-dependent) alias analysis.
882 Typically, this analysis will assume that expressions of certain
883 types do not alias expressions of certain other types. Only used
884 if alias analysis (in general) is enabled. */
885 int flag_strict_aliasing
= 0;
887 /* Instrument functions with calls at entry and exit, for profiling. */
888 int flag_instrument_function_entry_exit
= 0;
890 /* Nonzero means ignore `#ident' directives. 0 means handle them.
891 On SVR4 targets, it also controls whether or not to emit a
892 string identifying the compiler. */
894 int flag_no_ident
= 0;
896 /* This will perform a peephole pass before sched2. */
897 int flag_peephole2
= 0;
899 /* This will try to guess branch probabilities. */
900 int flag_guess_branch_prob
= 0;
902 /* -fbounded-pointers causes gcc to compile pointers as composite
903 objects occupying three words: the pointer value, the base address
904 of the referent object, and the address immediately beyond the end
905 of the referent object. The base and extent allow us to perform
906 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
907 int flag_bounded_pointers
= 0;
909 /* -fcheck-bounds causes gcc to generate array bounds checks.
910 For C, C++: defaults to value of flag_bounded_pointers.
911 For ObjC: defaults to off.
912 For Java: defaults to on.
913 For Fortran: defaults to off.
914 For CHILL: defaults to off. */
915 int flag_bounds_check
= 0;
917 /* This will attempt to merge constant section constants, if 1 only
918 string constants and constants from constant pool, if 2 also constant
920 int flag_merge_constants
= 1;
922 /* If one, renumber instruction UIDs to reduce the number of
923 unused UIDs if there are a lot of instructions. If greater than
924 one, unconditionally renumber instruction UIDs. */
925 int flag_renumber_insns
= 1;
927 /* Values of the -falign-* flags: how much to align labels in code.
928 0 means `use default', 1 means `don't align'.
929 For each variable, there is an _log variant which is the power
930 of two not less than the variable, for .align output. */
934 int align_loops_max_skip
;
937 int align_jumps_max_skip
;
939 int align_labels_log
;
940 int align_labels_max_skip
;
942 int align_functions_log
;
944 /* Table of supported debugging formats. */
947 const char *const arg
;
948 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
949 constant expression, we use NO_DEBUG in its place. */
950 const enum debug_info_type debug_type
;
951 const int use_extensions_p
;
952 const char *const description
;
956 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
957 N_("Generate debugging info in default format") },
958 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
959 #ifdef DBX_DEBUGGING_INFO
960 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
961 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
963 #ifdef DWARF_DEBUGGING_INFO
964 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
965 { "dwarf+", DWARF_DEBUG
, 1,
966 N_("Generate extended DWARF-1 format debug info") },
968 #ifdef DWARF2_DEBUGGING_INFO
969 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
971 #ifdef XCOFF_DEBUGGING_INFO
972 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
973 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
975 #ifdef SDB_DEBUGGING_INFO
976 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
986 const char *description
;
988 lang_independent_options
;
992 /* Add or remove a leading underscore from user symbols. */
993 int flag_leading_underscore
= -1;
995 /* The user symbol prefix after having resolved same. */
996 const char *user_label_prefix
;
998 static const param_info lang_independent_params
[] = {
999 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1000 { OPTION, DEFAULT, HELP },
1001 #include "params.def"
1006 /* A default for same. */
1007 #ifndef USER_LABEL_PREFIX
1008 #define USER_LABEL_PREFIX ""
1011 /* Table of language-independent -f options.
1012 STRING is the option name. VARIABLE is the address of the variable.
1013 ON_VALUE is the value to store in VARIABLE
1014 if `-fSTRING' is seen as an option.
1015 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1017 lang_independent_options f_options
[] =
1019 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
1020 N_("Perform DWARF2 duplicate elimination") },
1021 {"float-store", &flag_float_store
, 1,
1022 N_("Do not store floats in registers") },
1023 {"volatile", &flag_volatile
, 1,
1024 N_("Consider all mem refs through pointers as volatile") },
1025 {"volatile-global", &flag_volatile_global
, 1,
1026 N_("Consider all mem refs to global data to be volatile") },
1027 {"volatile-static", &flag_volatile_static
, 1,
1028 N_("Consider all mem refs to static data to be volatile") },
1029 {"defer-pop", &flag_defer_pop
, 1,
1030 N_("Defer popping functions args from stack until later") },
1031 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1032 N_("When possible do not generate stack frames") },
1033 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1034 N_("Optimize sibling and tail recursive calls") },
1035 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1036 N_("When running CSE, follow jumps to their targets") },
1037 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1038 N_("When running CSE, follow conditional jumps") },
1039 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1040 N_("Perform a number of minor, expensive optimisations") },
1041 {"thread-jumps", &flag_thread_jumps
, 1,
1042 N_("Perform jump threading optimisations") },
1043 {"strength-reduce", &flag_strength_reduce
, 1,
1044 N_("Perform strength reduction optimisations") },
1045 {"unroll-loops", &flag_unroll_loops
, 1,
1046 N_("Perform loop unrolling when iteration count is known") },
1047 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1048 N_("Perform loop unrolling for all loops") },
1049 {"move-all-movables", &flag_move_all_movables
, 1,
1050 N_("Force all loop invariant computations out of loops") },
1051 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1052 N_("Strength reduce all loop general induction variables") },
1053 {"writable-strings", &flag_writable_strings
, 1,
1054 N_("Store strings in writable data section") },
1055 {"peephole", &flag_no_peephole
, 0,
1056 N_("Enable machine specific peephole optimisations") },
1057 {"force-mem", &flag_force_mem
, 1,
1058 N_("Copy memory operands into registers before using") },
1059 {"force-addr", &flag_force_addr
, 1,
1060 N_("Copy memory address constants into regs before using") },
1061 {"function-cse", &flag_no_function_cse
, 0,
1062 N_("Allow function addresses to be held in registers") },
1063 {"inline-functions", &flag_inline_functions
, 1,
1064 N_("Integrate simple functions into their callers") },
1065 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1066 N_("Generate code for funcs even if they are fully inlined") },
1067 {"inline", &flag_no_inline
, 0,
1068 N_("Pay attention to the 'inline' keyword") },
1069 {"keep-static-consts", &flag_keep_static_consts
, 1,
1070 N_("Emit static const variables even if they are not used") },
1071 {"syntax-only", &flag_syntax_only
, 1,
1072 N_("Check for syntax errors, then stop") },
1073 {"shared-data", &flag_shared_data
, 1,
1074 N_("Mark data as shared rather than private") },
1075 {"caller-saves", &flag_caller_saves
, 1,
1076 N_("Enable saving registers around function calls") },
1077 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1078 N_("Return 'short' aggregates in memory, not registers") },
1079 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1080 N_("Return 'short' aggregates in registers") },
1081 {"delayed-branch", &flag_delayed_branch
, 1,
1082 N_("Attempt to fill delay slots of branch instructions") },
1083 {"gcse", &flag_gcse
, 1,
1084 N_("Perform the global common subexpression elimination") },
1085 {"gcse-lm", &flag_gcse_lm
, 1,
1086 N_("Perform enhanced load motion during global subexpression elimination") },
1087 {"gcse-sm", &flag_gcse_sm
, 1,
1088 N_("Perform store motion after global subexpression elimination") },
1089 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1090 N_("Run CSE pass after loop optimisations") },
1091 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1092 N_("Run the loop optimiser twice") },
1093 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1094 N_("Delete useless null pointer checks") },
1095 {"pretend-float", &flag_pretend_float
, 1,
1096 N_("Pretend that host and target use the same FP format") },
1097 {"schedule-insns", &flag_schedule_insns
, 1,
1098 N_("Reschedule instructions before register allocation") },
1099 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1100 N_("Reschedule instructions after register allocation") },
1101 {"sched-interblock",&flag_schedule_interblock
, 1,
1102 N_("Enable scheduling across basic blocks") },
1103 {"sched-spec",&flag_schedule_speculative
, 1,
1104 N_("Allow speculative motion of non-loads") },
1105 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1106 N_("Allow speculative motion of some loads") },
1107 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1108 N_("Allow speculative motion of more loads") },
1109 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1110 N_("Replace add,compare,branch with branch on count reg") },
1111 {"pic", &flag_pic
, 1,
1112 N_("Generate position independent code, if possible") },
1113 {"PIC", &flag_pic
, 2, ""},
1114 {"exceptions", &flag_exceptions
, 1,
1115 N_("Enable exception handling") },
1116 {"unwind-tables", &flag_unwind_tables
, 1,
1117 N_("Just generate unwind tables for exception handling") },
1118 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1119 N_("Generate unwind tables exact at each instruction boundary") },
1120 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1121 N_("Support synchronous non-call exceptions") },
1122 {"profile-arcs", &profile_arc_flag
, 1,
1123 N_("Insert arc based program profiling code") },
1124 {"test-coverage", &flag_test_coverage
, 1,
1125 N_("Create data files needed by gcov") },
1126 {"branch-probabilities", &flag_branch_probabilities
, 1,
1127 N_("Use profiling information for branch probabilities") },
1128 {"reorder-blocks", &flag_reorder_blocks
, 1,
1129 N_("Reorder basic blocks to improve code placement") },
1130 {"rename-registers", &flag_rename_registers
, 1,
1131 N_("Do the register renaming optimization pass") },
1132 {"common", &flag_no_common
, 0,
1133 N_("Do not put uninitialized globals in the common section") },
1134 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1135 N_("Do not generate .size directives") },
1136 {"function-sections", &flag_function_sections
, 1,
1137 N_("place each function into its own section") },
1138 {"data-sections", &flag_data_sections
, 1,
1139 N_("place data items into their own section") },
1140 {"verbose-asm", &flag_verbose_asm
, 1,
1141 N_("Add extra commentry to assembler output") },
1142 {"gnu-linker", &flag_gnu_linker
, 1,
1143 N_("Output GNU ld formatted global initialisers") },
1144 {"regmove", &flag_regmove
, 1,
1145 N_("Enables a register move optimisation") },
1146 {"optimize-register-move", &flag_regmove
, 1,
1147 N_("Do the full regmove optimization pass") },
1148 {"pack-struct", &flag_pack_struct
, 1,
1149 N_("Pack structure members together without holes") },
1150 {"stack-check", &flag_stack_check
, 1,
1151 N_("Insert stack checking code into the program") },
1152 {"argument-alias", &flag_argument_noalias
, 0,
1153 N_("Specify that arguments may alias each other & globals") },
1154 {"argument-noalias", &flag_argument_noalias
, 1,
1155 N_("Assume arguments may alias globals but not each other") },
1156 {"argument-noalias-global", &flag_argument_noalias
, 2,
1157 N_("Assume arguments do not alias each other or globals") },
1158 {"strict-aliasing", &flag_strict_aliasing
, 1,
1159 N_("Assume strict aliasing rules apply") },
1160 {"align-loops", &align_loops
, 0,
1161 N_("Align the start of loops") },
1162 {"align-jumps", &align_jumps
, 0,
1163 N_("Align labels which are only reached by jumping") },
1164 {"align-labels", &align_labels
, 0,
1165 N_("Align all labels") },
1166 {"align-functions", &align_functions
, 0,
1167 N_("Align the start of functions") },
1168 {"merge-constants", &flag_merge_constants
, 1,
1169 N_("Attempt to merge identical constants accross compilation units") },
1170 {"merge-all-constants", &flag_merge_constants
, 2,
1171 N_("Attempt to merge identical constants and constant variables") },
1172 {"check-memory-usage", &flag_check_memory_usage
, 1,
1173 N_("Generate code to check every memory access") },
1174 {"prefix-function-name", &flag_prefix_function_name
, 1,
1175 N_("Add a prefix to all function names") },
1176 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1177 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1178 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1179 N_("Instrument function entry/exit with profiling calls") },
1180 {"ssa", &flag_ssa
, 1,
1181 N_("Enable SSA optimizations") },
1182 {"ssa-ccp", &flag_ssa_ccp
, 1,
1183 N_("Enable SSA conditional constant propagation") },
1184 {"ssa-dce", &flag_ssa_dce
, 1,
1185 N_("Enable aggressive SSA dead code elimination") },
1186 {"leading-underscore", &flag_leading_underscore
, 1,
1187 N_("External symbols have a leading underscore") },
1188 {"ident", &flag_no_ident
, 0,
1189 N_("Process #ident directives") },
1190 { "peephole2", &flag_peephole2
, 1,
1191 N_("Enables an rtl peephole pass run before sched2") },
1192 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1193 N_("Enables guessing of branch probabilities") },
1194 {"math-errno", &flag_errno_math
, 1,
1195 N_("Set errno after built-in math functions") },
1196 {"trapping-math", &flag_trapping_math
, 1,
1197 N_("Floating-point operations can trap") },
1198 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1199 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1200 {"bounded-pointers", &flag_bounded_pointers
, 1,
1201 N_("Compile pointers as triples: value, base & end") },
1202 {"bounds-check", &flag_bounds_check
, 1,
1203 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1204 {"single-precision-constant", &flag_single_precision_constant
, 1,
1205 N_("Convert floating point constant to single precision constant") },
1206 {"time-report", &time_report
, 1,
1207 N_("Report time taken by each compiler pass at end of run") },
1208 {"mem-report", &mem_report
, 1,
1209 N_("Report on permanent memory allocation at end of run") },
1210 { "trapv", &flag_trapv
, 1,
1211 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1214 /* Table of language-specific options. */
1216 static const struct lang_opt
1218 const char *const option
;
1219 const char *const description
;
1221 documented_lang_options
[] =
1223 /* In order not to overload the --help output, the convention
1224 used here is to only describe those options which are not
1225 enabled by default. */
1228 N_("Compile just for ISO C89") },
1229 { "-fallow-single-precision",
1230 N_("Do not promote floats to double if using -traditional") },
1232 N_("Determine language standard") },
1234 { "-fsigned-bitfields", "" },
1235 { "-funsigned-bitfields",
1236 N_("Make bitfields by unsigned by default") },
1237 { "-fno-signed-bitfields", "" },
1238 { "-fno-unsigned-bitfields","" },
1240 N_("Make 'char' be signed by default") },
1241 { "-funsigned-char",
1242 N_("Make 'char' be unsigned by default") },
1243 { "-fno-signed-char", "" },
1244 { "-fno-unsigned-char", "" },
1246 { "-ftraditional", "" },
1248 N_("Attempt to support traditional K&R style C") },
1249 { "-fnotraditional", "" },
1250 { "-fno-traditional", "" },
1254 N_("Do not recognise the 'asm' keyword") },
1255 { "-fbuiltin", "" },
1257 N_("Do not recognise any built in functions") },
1259 N_("Assume normal C execution environment") },
1260 { "-fno-hosted", "" },
1262 N_("Assume that standard libraries & main might not exist") },
1263 { "-fno-freestanding", "" },
1264 { "-fcond-mismatch",
1265 N_("Allow different types as args of ? operator") },
1266 { "-fno-cond-mismatch", "" },
1267 { "-fdollars-in-identifiers",
1268 N_("Allow the use of $ inside identifiers") },
1269 { "-fno-dollars-in-identifiers", "" },
1270 { "-fpreprocessed", "" },
1271 { "-fno-preprocessed", "" },
1273 N_("Use the same size for double as for float") },
1274 { "-fno-short-double", "" },
1276 N_("Use the smallest fitting integer to hold enums") },
1277 { "-fno-short-enums", "" },
1279 N_("Override the underlying type for wchar_t to `unsigned short'") },
1280 { "-fno-short-wchar", "" },
1283 N_("Enable most warning messages") },
1284 { "-Wbad-function-cast",
1285 N_("Warn about casting functions to incompatible types") },
1286 { "-Wno-bad-function-cast", "" },
1287 { "-Wno-missing-noreturn", "" },
1288 { "-Wmissing-format-attribute",
1289 N_("Warn about functions which might be candidates for format attributes") },
1290 { "-Wno-missing-format-attribute", "" },
1292 N_("Warn about casts which discard qualifiers") },
1293 { "-Wno-cast-qual", "" },
1294 { "-Wchar-subscripts",
1295 N_("Warn about subscripts whose type is 'char'") },
1296 { "-Wno-char-subscripts", "" },
1298 N_("Warn if nested comments are detected") },
1299 { "-Wno-comment", "" },
1301 N_("Warn if nested comments are detected") },
1302 { "-Wno-comments", "" },
1304 N_("Warn about possibly confusing type conversions") },
1305 { "-Wno-conversion", "" },
1307 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1308 { "-Wno-format", "" },
1309 { "-Wformat-y2k", "" },
1310 { "-Wno-format-y2k",
1311 N_("Don't warn about strftime formats yielding 2 digit years") },
1312 { "-Wformat-extra-args", "" },
1313 { "-Wno-format-extra-args",
1314 N_("Don't warn about too many arguments to format functions") },
1315 { "-Wformat-nonliteral",
1316 N_("Warn about non-string-literal format strings") },
1317 { "-Wno-format-nonliteral", "" },
1318 { "-Wformat-security",
1319 N_("Warn about possible security problems with format functions") },
1320 { "-Wno-format-security", "" },
1321 { "-Wimplicit-function-declaration",
1322 N_("Warn about implicit function declarations") },
1323 { "-Wno-implicit-function-declaration", "" },
1324 { "-Werror-implicit-function-declaration", "" },
1326 N_("Warn when a declaration does not specify a type") },
1327 { "-Wno-implicit-int", "" },
1328 { "-Wimplicit", "" },
1329 { "-Wno-implicit", "" },
1331 N_("Warn about the use of the #import directive") },
1332 { "-Wno-import", "" },
1333 { "-Wlong-long","" },
1335 N_("Do not warn about using 'long long' when -pedantic") },
1337 N_("Warn about suspicious declarations of main") },
1338 { "-Wno-main", "" },
1339 { "-Wmissing-braces",
1340 N_("Warn about possibly missing braces around initialisers") },
1341 { "-Wno-missing-braces", "" },
1342 { "-Wmissing-declarations",
1343 N_("Warn about global funcs without previous declarations") },
1344 { "-Wno-missing-declarations", "" },
1345 { "-Wmissing-prototypes",
1346 N_("Warn about global funcs without prototypes") },
1347 { "-Wno-missing-prototypes", "" },
1349 N_("Warn about use of multicharacter literals") },
1350 { "-Wno-multichar", "" },
1351 { "-Wnested-externs",
1352 N_("Warn about externs not at file scope level") },
1353 { "-Wno-nested-externs", "" },
1355 N_("Warn about possible missing parentheses") },
1356 { "-Wno-parentheses", "" },
1357 { "-Wsequence-point",
1358 N_("Warn about possible violations of sequence point rules") },
1359 { "-Wno-sequence-point", "" },
1360 { "-Wpointer-arith",
1361 N_("Warn about function pointer arithmetic") },
1362 { "-Wno-pointer-arith", "" },
1363 { "-Wredundant-decls",
1364 N_("Warn about multiple declarations of the same object") },
1365 { "-Wno-redundant-decls", "" },
1367 N_("Warn about signed/unsigned comparisons") },
1368 { "-Wno-sign-compare", "" },
1370 N_("Warn about testing equality of floating point numbers") },
1371 { "-Wno-float-equal", "" },
1372 { "-Wunknown-pragmas",
1373 N_("Warn about unrecognized pragmas") },
1374 { "-Wno-unknown-pragmas", "" },
1375 { "-Wstrict-prototypes",
1376 N_("Warn about non-prototyped function decls") },
1377 { "-Wno-strict-prototypes", "" },
1379 N_("Warn about constructs whose meaning change in ISO C") },
1380 { "-Wno-traditional", "" },
1382 N_("Warn when trigraphs are encountered") },
1383 { "-Wno-trigraphs", "" },
1385 { "-Wno-undef", "" },
1386 { "-Wwrite-strings",
1387 N_("Mark strings as 'const char *'") },
1388 { "-Wno-write-strings", "" },
1390 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1392 #include "options.h"
1396 /* Here is a table, controlled by the tm.h file, listing each -m switch
1397 and which bits in `target_switches' it should set or clear.
1398 If VALUE is positive, it is bits to set.
1399 If VALUE is negative, -VALUE is bits to clear.
1400 (The sign bit is not used so there is no confusion.) */
1404 const char *const name
;
1406 const char *const description
;
1408 target_switches
[] = TARGET_SWITCHES
;
1410 /* This table is similar, but allows the switch to have a value. */
1412 #ifdef TARGET_OPTIONS
1415 const char *const prefix
;
1416 const char **const variable
;
1417 const char *const description
;
1419 target_options
[] = TARGET_OPTIONS
;
1422 /* Options controlling warnings. */
1424 /* Don't print warning messages. -w. */
1426 int inhibit_warnings
= 0;
1428 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1430 int warn_system_headers
= 0;
1432 /* Print various extra warnings. -W. */
1434 int extra_warnings
= 0;
1436 /* Treat warnings as errors. -Werror. */
1438 int warnings_are_errors
= 0;
1440 /* Nonzero to warn about unused variables, functions et.al. */
1442 int warn_unused_function
;
1443 int warn_unused_label
;
1444 int warn_unused_parameter
;
1445 int warn_unused_variable
;
1446 int warn_unused_value
;
1448 /* Nonzero to warn about code which is never reached. */
1450 int warn_notreached
;
1452 /* Nonzero to warn about variables used before they are initialized. */
1454 int warn_uninitialized
;
1456 /* Nonzero means warn about all declarations which shadow others. */
1460 /* Warn if a switch on an enum fails to have a case for every enum value. */
1464 /* Nonzero means warn about function definitions that default the return type
1465 or that use a null return and have a return-type other than void. */
1467 int warn_return_type
;
1469 /* Nonzero means warn about pointer casts that increase the required
1470 alignment of the target type (and might therefore lead to a crash
1471 due to a misaligned access). */
1473 int warn_cast_align
;
1475 /* Nonzero means warn about any objects definitions whose size is larger
1476 than N bytes. Also want about function definitions whose returned
1477 values are larger than N bytes. The value N is in `larger_than_size'. */
1479 int warn_larger_than
;
1480 HOST_WIDE_INT larger_than_size
;
1482 /* Nonzero means warn if inline function is too large. */
1486 /* Warn if a function returns an aggregate,
1487 since there are often incompatible calling conventions for doing this. */
1489 int warn_aggregate_return
;
1491 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1495 /* Warn when gcc pads a structure to an alignment boundary. */
1499 /* Warn when an optimization pass is disabled. */
1501 int warn_disabled_optimization
;
1503 /* Warn about functions which might be candidates for attribute noreturn. */
1505 int warn_missing_noreturn
;
1507 /* Likewise for -W. */
1509 lang_independent_options W_options
[] =
1511 {"unused-function", &warn_unused_function
, 1,
1512 N_("Warn when a function is unused") },
1513 {"unused-label", &warn_unused_label
, 1,
1514 N_("Warn when a label is unused") },
1515 {"unused-parameter", &warn_unused_parameter
, 1,
1516 N_("Warn when a function parameter is unused") },
1517 {"unused-variable", &warn_unused_variable
, 1,
1518 N_("Warn when a variable is unused") },
1519 {"unused-value", &warn_unused_value
, 1,
1520 N_("Warn when an expression value is unused") },
1521 {"system-headers", &warn_system_headers
, 1,
1522 N_("Do not suppress warnings from system headers") },
1523 {"error", &warnings_are_errors
, 1,
1524 N_("Treat all warnings as errors") },
1525 {"shadow", &warn_shadow
, 1,
1526 N_("Warn when one local variable shadows another") },
1527 {"switch", &warn_switch
, 1,
1528 N_("Warn about enumerated switches missing a specific case") },
1529 {"aggregate-return", &warn_aggregate_return
, 1,
1530 N_("Warn about returning structures, unions or arrays") },
1531 {"cast-align", &warn_cast_align
, 1,
1532 N_("Warn about pointer casts which increase alignment") },
1533 {"unreachable-code", &warn_notreached
, 1,
1534 N_("Warn about code that will never be executed") },
1535 {"uninitialized", &warn_uninitialized
, 1,
1536 N_("Warn about uninitialized automatic variables") },
1537 {"inline", &warn_inline
, 1,
1538 N_("Warn when an inlined function cannot be inlined") },
1539 {"packed", &warn_packed
, 1,
1540 N_("Warn when the packed attribute has no effect on struct layout") },
1541 {"padded", &warn_padded
, 1,
1542 N_("Warn when padding is required to align struct members") },
1543 {"disabled-optimization", &warn_disabled_optimization
, 1,
1544 N_("Warn when an optimization pass is disabled") },
1545 {"missing-noreturn", &warn_missing_noreturn
, 1,
1546 N_("Warn about functions which might be candidates for attribute noreturn") }
1550 set_Wunused (setting
)
1553 warn_unused_function
= setting
;
1554 warn_unused_label
= setting
;
1555 /* Unused function parameter warnings are reported when either ``-W
1556 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1557 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1559 warn_unused_parameter
= 0;
1560 else if (!warn_unused_parameter
)
1561 warn_unused_parameter
= -1;
1562 warn_unused_variable
= setting
;
1563 warn_unused_value
= setting
;
1566 /* The following routines are useful in setting all the flags that
1567 -ffast-math and -fno-fast-math imply. */
1570 set_fast_math_flags ()
1572 flag_trapping_math
= 0;
1573 flag_unsafe_math_optimizations
= 1;
1574 flag_errno_math
= 0;
1578 set_no_fast_math_flags ()
1580 flag_trapping_math
= 1;
1581 flag_unsafe_math_optimizations
= 0;
1582 flag_errno_math
= 1;
1586 /* Output files for assembler code (real compiler output)
1587 and debugging dumps. */
1590 FILE *aux_info_file
;
1591 FILE *rtl_dump_file
= NULL
;
1593 /* Decode the string P as an integral parameter.
1594 If the string is indeed an integer return its numeric value else
1595 issue an Invalid Option error for the option PNAME and return DEFVAL.
1596 If PNAME is zero just return DEFVAL, do not call error. */
1599 read_integral_parameter (p
, pname
, defval
)
1604 const char *endp
= p
;
1608 if (ISDIGIT (*endp
))
1617 error ("Invalid option `%s'", pname
);
1625 /* This is the default decl_printable_name function. */
1628 decl_name (decl
, verbosity
)
1630 int verbosity ATTRIBUTE_UNUSED
;
1632 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1636 /* This calls abort and is used to avoid problems when abort if a macro.
1637 It is used when we need to pass the address of abort. */
1645 /* When `malloc.c' is compiled with `rcheck' defined,
1646 it calls this function to report clobberage. */
1650 const char *s ATTRIBUTE_UNUSED
;
1655 /* Return the logarithm of X, base 2, considering X unsigned,
1656 if X is a power of 2. Otherwise, returns -1.
1658 This should be used via the `exact_log2' macro. */
1662 unsigned HOST_WIDE_INT x
;
1665 /* Test for 0 or a power of 2. */
1666 if (x
== 0 || x
!= (x
& -x
))
1668 while ((x
>>= 1) != 0)
1673 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1674 If X is 0, return -1.
1676 This should be used via the floor_log2 macro. */
1680 unsigned HOST_WIDE_INT x
;
1689 static int float_handler_set
;
1691 jmp_buf float_handler
;
1693 /* Signals actually come here. */
1696 float_signal (signo
)
1697 /* If this is missing, some compilers complain. */
1698 int signo ATTRIBUTE_UNUSED
;
1700 if (float_handled
== 0)
1701 crash_signal (signo
);
1704 /* On System-V derived systems, we must reinstall the signal handler.
1705 This is harmless on BSD-derived systems. */
1706 signal (SIGFPE
, float_signal
);
1707 longjmp (float_handler
, 1);
1710 /* Specify where to longjmp to when a floating arithmetic error happens.
1711 If HANDLER is 0, it means don't handle the errors any more. */
1714 set_float_handler (handler
)
1717 float_handled
= (handler
!= 0);
1719 memcpy (float_handler
, handler
, sizeof (float_handler
));
1721 if (float_handled
&& ! float_handler_set
)
1723 signal (SIGFPE
, float_signal
);
1724 float_handler_set
= 1;
1728 /* This is a wrapper function for code which might elicit an
1729 arithmetic exception. That code should be passed in as a function
1730 pointer FN, and one argument DATA. DATA is usually a struct which
1731 contains the real input and output for function FN. This function
1732 returns 0 (failure) if longjmp was called (i.e. an exception
1733 occurred.) It returns 1 (success) otherwise. */
1736 do_float_handler (fn
, data
)
1737 void (*fn
) PARAMS ((PTR
));
1744 /* We got here via longjmp () caused by an exception in function
1746 set_float_handler (NULL
);
1750 set_float_handler (buf
);
1752 set_float_handler (NULL
);
1756 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1757 into ICE messages, which is much more user friendly. */
1760 crash_signal (signo
)
1763 internal_error ("Internal error: %s", strsignal (signo
));
1766 /* Strip off a legitimate source ending from the input string NAME of
1767 length LEN. Rather than having to know the names used by all of
1768 our front ends, we strip off an ending of a period followed by
1769 up to five characters. (Java uses ".class".) */
1772 strip_off_ending (name
, len
)
1777 for (i
= 2; i
< 6 && len
> i
; i
++)
1779 if (name
[len
- i
] == '.')
1781 name
[len
- i
] = '\0';
1787 /* Output a quoted string. */
1790 output_quoted_string (asm_file
, string
)
1794 #ifdef OUTPUT_QUOTED_STRING
1795 OUTPUT_QUOTED_STRING (asm_file
, string
);
1799 putc ('\"', asm_file
);
1800 while ((c
= *string
++) != 0)
1802 if (c
== '\"' || c
== '\\')
1803 putc ('\\', asm_file
);
1806 putc ('\"', asm_file
);
1810 /* Output a file name in the form wanted by System V. */
1813 output_file_directive (asm_file
, input_name
)
1815 const char *input_name
;
1817 int len
= strlen (input_name
);
1818 const char *na
= input_name
+ len
;
1820 /* NA gets INPUT_NAME sans directory names. */
1821 while (na
> input_name
)
1823 if (IS_DIR_SEPARATOR (na
[-1]))
1828 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1829 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1831 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1832 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1834 fprintf (asm_file
, "\t.file\t");
1835 output_quoted_string (asm_file
, na
);
1836 fputc ('\n', asm_file
);
1841 /* Routine to open a dump file. Return true if the dump file is enabled. */
1844 open_dump_file (index
, decl
)
1845 enum dump_file_index index
;
1849 const char *open_arg
;
1852 if (! dump_file
[index
].enabled
)
1855 timevar_push (TV_DUMP
);
1856 if (rtl_dump_file
!= NULL
)
1857 fclose (rtl_dump_file
);
1859 sprintf (seq
, ".%02d.", index
);
1861 if (! dump_file
[index
].initialized
)
1863 /* If we've not initialized the files, do so now. */
1864 if (graph_dump_format
!= no_graph
1865 && dump_file
[index
].graph_dump_p
)
1867 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1868 clean_graph_dump_file (dump_base_name
, dump_name
);
1871 dump_file
[index
].initialized
= 1;
1877 dump_name
= concat (dump_base_name
, seq
,
1878 dump_file
[index
].extension
, NULL
);
1880 rtl_dump_file
= fopen (dump_name
, open_arg
);
1881 if (rtl_dump_file
== NULL
)
1882 fatal_io_error ("can't open %s", dump_name
);
1887 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1888 decl_printable_name (decl
, 2));
1890 timevar_pop (TV_DUMP
);
1894 /* Routine to close a dump file. */
1897 close_dump_file (index
, func
, insns
)
1898 enum dump_file_index index
;
1899 void (*func
) PARAMS ((FILE *, rtx
));
1902 if (! rtl_dump_file
)
1905 timevar_push (TV_DUMP
);
1907 && graph_dump_format
!= no_graph
1908 && dump_file
[index
].graph_dump_p
)
1913 sprintf (seq
, ".%02d.", index
);
1914 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1915 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1920 func (rtl_dump_file
, insns
);
1922 fflush (rtl_dump_file
);
1923 fclose (rtl_dump_file
);
1925 rtl_dump_file
= NULL
;
1926 timevar_pop (TV_DUMP
);
1929 /* Do any final processing required for the declarations in VEC, of
1930 which there are LEN. We write out inline functions and variables
1931 that have been deferred until this point, but which are required.
1932 Returns non-zero if anything was put out. */
1935 wrapup_global_declarations (vec
, len
)
1942 int output_something
= 0;
1944 for (i
= 0; i
< len
; i
++)
1948 /* We're not deferring this any longer. */
1949 DECL_DEFER_OUTPUT (decl
) = 0;
1951 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1952 && incomplete_decl_finalize_hook
!= 0)
1953 (*incomplete_decl_finalize_hook
) (decl
);
1956 /* Now emit any global variables or functions that we have been
1957 putting off. We need to loop in case one of the things emitted
1958 here references another one which comes earlier in the list. */
1962 for (i
= 0; i
< len
; i
++)
1966 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1969 /* Don't write out static consts, unless we still need them.
1971 We also keep static consts if not optimizing (for debugging),
1972 unless the user specified -fno-keep-static-consts.
1973 ??? They might be better written into the debug information.
1974 This is possible when using DWARF.
1976 A language processor that wants static constants to be always
1977 written out (even if it is not used) is responsible for
1978 calling rest_of_decl_compilation itself. E.g. the C front-end
1979 calls rest_of_decl_compilation from finish_decl.
1980 One motivation for this is that is conventional in some
1981 environments to write things like:
1982 static const char rcsid[] = "... version string ...";
1983 intending to force the string to be in the executable.
1985 A language processor that would prefer to have unneeded
1986 static constants "optimized away" would just defer writing
1987 them out until here. E.g. C++ does this, because static
1988 constants are often defined in header files.
1990 ??? A tempting alternative (for both C and C++) would be
1991 to force a constant to be written if and only if it is
1992 defined in a main file, as opposed to an include file. */
1994 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1995 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1996 && !DECL_COMDAT (decl
))
1998 && flag_keep_static_consts
1999 && !DECL_ARTIFICIAL (decl
))
2000 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
2003 rest_of_decl_compilation (decl
, NULL
, 1, 1);
2006 if (TREE_CODE (decl
) == FUNCTION_DECL
2007 && DECL_INITIAL (decl
) != 0
2008 && DECL_SAVED_INSNS (decl
) != 0
2009 && (flag_keep_inline_functions
2010 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
2011 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
2014 output_inline_function (decl
);
2019 output_something
= 1;
2023 return output_something
;
2026 /* Issue appropriate warnings for the global declarations in VEC (of
2027 which there are LEN). Output debugging information for them. */
2030 check_global_declarations (vec
, len
)
2037 for (i
= 0; i
< len
; i
++)
2041 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2042 && ! TREE_ASM_WRITTEN (decl
))
2043 /* Cancel the RTL for this decl so that, if debugging info
2044 output for global variables is still to come,
2045 this one will be omitted. */
2046 SET_DECL_RTL (decl
, NULL_RTX
);
2048 /* Warn about any function
2049 declared static but not defined.
2050 We don't warn about variables,
2051 because many programs have static variables
2052 that exist only to get some text into the object file. */
2053 if (TREE_CODE (decl
) == FUNCTION_DECL
2054 && (warn_unused_function
2055 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2056 && DECL_INITIAL (decl
) == 0
2057 && DECL_EXTERNAL (decl
)
2058 && ! DECL_ARTIFICIAL (decl
)
2059 && ! TREE_PUBLIC (decl
))
2061 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2062 pedwarn_with_decl (decl
,
2063 "`%s' used but never defined");
2065 warning_with_decl (decl
,
2066 "`%s' declared `static' but never defined");
2067 /* This symbol is effectively an "extern" declaration now. */
2068 TREE_PUBLIC (decl
) = 1;
2069 assemble_external (decl
);
2072 /* Warn about static fns or vars defined but not used,
2073 but not about inline functions or static consts
2074 since defining those in header files is normal practice. */
2075 if (((warn_unused_function
2076 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2077 || (warn_unused_variable
2078 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2079 && ! DECL_IN_SYSTEM_HEADER (decl
)
2080 && ! DECL_EXTERNAL (decl
)
2081 && ! TREE_PUBLIC (decl
)
2082 && ! TREE_USED (decl
)
2083 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2084 /* The TREE_USED bit for file-scope decls
2085 is kept in the identifier, to handle multiple
2086 external decls in different scopes. */
2087 && ! TREE_USED (DECL_NAME (decl
)))
2088 warning_with_decl (decl
, "`%s' defined but not used");
2090 timevar_push (TV_SYMOUT
);
2091 (*debug_hooks
->global_decl
) (decl
);
2092 timevar_pop (TV_SYMOUT
);
2096 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2097 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2098 INPUT_FILENAME and LINENO accordingly. */
2101 push_srcloc (file
, line
)
2105 struct file_stack
*fs
;
2107 if (input_file_stack
)
2109 input_file_stack
->name
= input_filename
;
2110 input_file_stack
->line
= lineno
;
2113 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2114 fs
->name
= input_filename
= file
;
2115 fs
->line
= lineno
= line
;
2116 fs
->indent_level
= 0;
2117 fs
->next
= input_file_stack
;
2118 input_file_stack
= fs
;
2119 input_file_stack_tick
++;
2122 /* Pop the top entry off the stack of presently open source files.
2123 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2129 struct file_stack
*fs
;
2131 fs
= input_file_stack
;
2132 input_file_stack
= fs
->next
;
2134 input_file_stack_tick
++;
2135 /* The initial source file is never popped. */
2136 if (!input_file_stack
)
2138 input_filename
= input_file_stack
->name
;
2139 lineno
= input_file_stack
->line
;
2142 /* Compile an entire translation unit. Write a file of assembly
2143 output and various debugging dumps. */
2150 /* Initialize yet another pass. */
2152 init_final (main_input_filename
);
2153 init_branch_prob (dump_base_name
);
2155 timevar_push (TV_PARSE
);
2157 /* Call the parser, which parses the entire file
2158 (calling rest_of_compilation for each function). */
2161 /* In case there were missing block closers,
2162 get us back to the global binding level. */
2163 (*lang_hooks
.clear_binding_stack
) ();
2165 /* Compilation is now finished except for writing
2166 what's left of the symbol table output. */
2168 timevar_pop (TV_PARSE
);
2170 if (flag_syntax_only
)
2173 globals
= getdecls ();
2175 /* Really define vars that have had only a tentative definition.
2176 Really output inline functions that must actually be callable
2177 and have not been output so far. */
2180 int len
= list_length (globals
);
2181 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2185 /* Process the decls in reverse order--earliest first.
2186 Put them into VEC from back to front, then take out from front. */
2188 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2189 vec
[len
- i
- 1] = decl
;
2191 wrapup_global_declarations (vec
, len
);
2193 /* This must occur after the loop to output deferred functions. Else
2194 the profiler initializer would not be emitted if all the functions
2195 in this compilation unit were deferred.
2197 output_func_start_profiler can not cause any additional functions or
2198 data to need to be output, so it need not be in the deferred function
2200 output_func_start_profiler ();
2202 check_global_declarations (vec
, len
);
2208 /* Write out any pending weak symbol declarations. */
2212 /* Do dbx symbols. */
2213 timevar_push (TV_SYMOUT
);
2215 #ifdef DWARF2_UNWIND_INFO
2216 if (dwarf2out_do_frame ())
2217 dwarf2out_frame_finish ();
2220 (*debug_hooks
->finish
) (main_input_filename
);
2221 timevar_pop (TV_SYMOUT
);
2223 /* Output some stuff at end of file if nec. */
2225 dw2_output_indirect_constants ();
2227 end_final (dump_base_name
);
2229 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2231 timevar_push (TV_DUMP
);
2232 open_dump_file (DFI_bp
, NULL
);
2236 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2237 timevar_pop (TV_DUMP
);
2241 ASM_FILE_END (asm_out_file
);
2244 /* Attach a special .ident directive to the end of the file to identify
2245 the version of GCC which compiled this code. The format of the .ident
2246 string is patterned after the ones produced by native SVR4 compilers. */
2249 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2250 IDENT_ASM_OP
, version_string
);
2253 /* Language-specific end of compilation actions. */
2255 (*lang_hooks
.finish
) ();
2257 /* Close the dump files. */
2259 if (flag_gen_aux_info
)
2261 fclose (aux_info_file
);
2263 unlink (aux_info_file_name
);
2266 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2268 timevar_push (TV_DUMP
);
2269 dump_combine_total_stats (rtl_dump_file
);
2270 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2271 timevar_pop (TV_DUMP
);
2274 /* Close non-debugging input and output files. Take special care to note
2275 whether fclose returns an error, since the pages might still be on the
2276 buffer chain while the file is open. */
2280 if (ferror (asm_out_file
) != 0)
2281 fatal_io_error ("error writing to %s", asm_file_name
);
2282 if (fclose (asm_out_file
) != 0)
2283 fatal_io_error ("error closing %s", asm_file_name
);
2285 /* Do whatever is necessary to finish printing the graphs. */
2286 if (graph_dump_format
!= no_graph
)
2290 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2291 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2296 sprintf (seq
, ".%02d.", i
);
2297 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2298 finish_graph_dump_file (dump_base_name
, suffix
);
2305 ggc_print_statistics ();
2306 stringpool_statistics ();
2307 dump_tree_statistics ();
2310 /* Free up memory for the benefit of leak detectors. */
2314 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2315 and TYPE_DECL nodes.
2317 This does nothing for local (non-static) variables, unless the
2318 variable is a register variable with an ASMSPEC. In that case, or
2319 if the variable is not an automatic, it sets up the RTL and
2320 outputs any assembler code (label definition, storage allocation
2321 and initialization).
2323 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2324 the assembler symbol name to be used. TOP_LEVEL is nonzero
2325 if this declaration is not within a function. */
2328 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2330 const char *asmspec
;
2334 /* Declarations of variables, and of functions defined elsewhere. */
2336 /* The most obvious approach, to put an #ifndef around where
2337 this macro is used, doesn't work since it's inside a macro call. */
2338 #ifndef ASM_FINISH_DECLARE_OBJECT
2339 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2342 /* Forward declarations for nested functions are not "external",
2343 but we need to treat them as if they were. */
2344 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2345 || TREE_CODE (decl
) == FUNCTION_DECL
)
2347 timevar_push (TV_VARCONST
);
2349 make_decl_rtl (decl
, asmspec
);
2350 /* Don't output anything
2351 when a tentative file-scope definition is seen.
2352 But at end of compilation, do output code for them. */
2353 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2354 assemble_variable (decl
, top_level
, at_end
, 0);
2355 if (decl
== last_assemble_variable_decl
)
2357 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2360 timevar_pop (TV_VARCONST
);
2362 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2364 if (decode_reg_name (asmspec
) >= 0)
2366 SET_DECL_RTL (decl
, NULL_RTX
);
2367 make_decl_rtl (decl
, asmspec
);
2371 error ("invalid register name `%s' for register variable", asmspec
);
2372 DECL_REGISTER (decl
) = 0;
2377 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2378 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2379 && TREE_CODE (decl
) == TYPE_DECL
)
2381 timevar_push (TV_SYMOUT
);
2382 dbxout_symbol (decl
, 0);
2383 timevar_pop (TV_SYMOUT
);
2386 #ifdef SDB_DEBUGGING_INFO
2387 else if (write_symbols
== SDB_DEBUG
&& top_level
2388 && TREE_CODE (decl
) == TYPE_DECL
)
2390 timevar_push (TV_SYMOUT
);
2391 sdbout_symbol (decl
, 0);
2392 timevar_pop (TV_SYMOUT
);
2397 /* Called after finishing a record, union or enumeral type. */
2400 rest_of_type_compilation (type
, toplev
)
2401 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2405 tree type ATTRIBUTE_UNUSED
;
2406 int toplev ATTRIBUTE_UNUSED
;
2409 timevar_push (TV_SYMOUT
);
2410 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2411 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2412 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2414 #ifdef SDB_DEBUGGING_INFO
2415 if (write_symbols
== SDB_DEBUG
)
2416 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2418 #ifdef DWARF2_DEBUGGING_INFO
2419 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2420 dwarf2out_decl (TYPE_STUB_DECL (type
));
2422 timevar_pop (TV_SYMOUT
);
2425 /* This is called from finish_function (within yyparse)
2426 after each top-level definition is parsed.
2427 It is supposed to compile that function or variable
2428 and output the assembler code for it.
2429 After we return, the tree storage is freed. */
2432 rest_of_compilation (decl
)
2438 int rebuild_label_notes_after_reload
;
2439 int register_life_up_to_date
;
2441 timevar_push (TV_REST_OF_COMPILATION
);
2443 /* Now that we're out of the frontend, we shouldn't have any more
2444 CONCATs anywhere. */
2445 generating_concat_p
= 0;
2447 /* When processing delayed functions, prepare_function_start() won't
2448 have been run to re-initialize it. */
2449 cse_not_expected
= ! optimize
;
2451 /* First, make sure that NOTE_BLOCK is set correctly for each
2452 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2453 if (!cfun
->x_whole_function_mode_p
)
2456 /* Then remove any notes we don't need. That will make iterating
2457 over the instruction sequence faster, and allow the garbage
2458 collector to reclaim the memory used by the notes. */
2459 remove_unnecessary_notes ();
2461 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2462 tree in sensible shape. So, we just recalculate it here. */
2463 if (cfun
->x_whole_function_mode_p
)
2468 /* If we are reconsidering an inline function
2469 at the end of compilation, skip the stuff for making it inline. */
2471 if (DECL_SAVED_INSNS (decl
) == 0)
2477 /* If this is nested inside an inlined external function, pretend
2478 it was only declared. Since we cannot inline such functions,
2479 generating code for this one is not only not necessary but will
2480 confuse some debugging output writers. */
2481 for (parent
= DECL_CONTEXT (current_function_decl
);
2482 parent
!= NULL_TREE
;
2483 parent
= get_containing_scope (parent
))
2484 if (TREE_CODE (parent
) == FUNCTION_DECL
2485 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2487 DECL_INITIAL (decl
) = 0;
2488 goto exit_rest_of_compilation
;
2491 /* If requested, consider whether to make this function inline. */
2492 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2493 || flag_inline_functions
)
2495 timevar_push (TV_INTEGRATION
);
2496 lose
= function_cannot_inline_p (decl
);
2497 timevar_pop (TV_INTEGRATION
);
2498 if (lose
|| ! optimize
)
2500 if (warn_inline
&& DECL_INLINE (decl
))
2501 warning_with_decl (decl
, lose
);
2502 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2503 /* Don't really compile an extern inline function.
2504 If we can't make it inline, pretend
2505 it was only declared. */
2506 if (DECL_EXTERNAL (decl
))
2508 DECL_INITIAL (decl
) = 0;
2509 goto exit_rest_of_compilation
;
2513 /* ??? Note that this has the effect of making it look
2514 like "inline" was specified for a function if we choose
2515 to inline it. This isn't quite right, but it's
2516 probably not worth the trouble to fix. */
2517 inlinable
= DECL_INLINE (decl
) = 1;
2520 insns
= get_insns ();
2522 /* Dump the rtl code if we are dumping rtl. */
2524 if (open_dump_file (DFI_rtl
, decl
))
2526 if (DECL_SAVED_INSNS (decl
))
2527 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2528 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2531 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2532 sorts of eh initialization. Delay this until after the
2533 initial rtl dump so that we can see the original nesting. */
2534 convert_from_eh_region_ranges ();
2536 /* If function is inline, and we don't yet know whether to
2537 compile it by itself, defer decision till end of compilation.
2538 finish_compilation will call rest_of_compilation again
2539 for those functions that need to be output. Also defer those
2540 functions that we are supposed to defer. */
2543 || (DECL_INLINE (decl
)
2544 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2545 && ! flag_keep_inline_functions
)
2546 || DECL_EXTERNAL (decl
))))
2547 DECL_DEFER_OUTPUT (decl
) = 1;
2549 if (DECL_INLINE (decl
))
2550 /* DWARF wants separate debugging info for abstract and
2551 concrete instances of all inline functions, including those
2552 declared inline but not inlined, and those inlined even
2553 though they weren't declared inline. Conveniently, that's
2554 what DECL_INLINE means at this point. */
2555 (*debug_hooks
->deferred_inline_function
) (decl
);
2557 if (DECL_DEFER_OUTPUT (decl
))
2559 /* If -Wreturn-type, we have to do a bit of compilation. We just
2560 want to call cleanup the cfg to figure out whether or not we can
2561 fall off the end of the function; we do the minimum amount of
2562 work necessary to make that safe. */
2563 if (warn_return_type
)
2565 int saved_optimize
= optimize
;
2568 rebuild_jump_labels (insns
);
2569 find_exception_handler_labels ();
2570 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2571 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2572 optimize
= saved_optimize
;
2574 /* CFG is no longer maintained up-to-date. */
2575 free_bb_for_insn ();
2578 current_function_nothrow
= nothrow_function_p ();
2579 if (current_function_nothrow
)
2580 /* Now we know that this can't throw; set the flag for the benefit
2581 of other functions later in this translation unit. */
2582 TREE_NOTHROW (current_function_decl
) = 1;
2584 timevar_push (TV_INTEGRATION
);
2585 save_for_inline (decl
);
2586 timevar_pop (TV_INTEGRATION
);
2587 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2588 goto exit_rest_of_compilation
;
2591 /* If specified extern inline but we aren't inlining it, we are
2592 done. This goes for anything that gets here with DECL_EXTERNAL
2593 set, not just things with DECL_INLINE. */
2594 if (DECL_EXTERNAL (decl
))
2595 goto exit_rest_of_compilation
;
2600 /* Initialize some variables used by the optimizers. */
2601 init_function_for_compilation ();
2603 if (! DECL_DEFER_OUTPUT (decl
))
2604 TREE_ASM_WRITTEN (decl
) = 1;
2606 /* Now that integrate will no longer see our rtl, we need not
2607 distinguish between the return value of this function and the
2608 return value of called functions. Also, we can remove all SETs
2609 of subregs of hard registers; they are only here because of
2610 integrate. Also, we can now initialize pseudos intended to
2611 carry magic hard reg data throughout the function. */
2612 rtx_equal_function_value_matters
= 0;
2613 purge_hard_subreg_sets (get_insns ());
2614 emit_initial_value_sets ();
2616 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2617 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2618 goto exit_rest_of_compilation
;
2620 /* We may have potential sibling or tail recursion sites. Select one
2621 (of possibly multiple) methods of performing the call. */
2622 if (flag_optimize_sibling_calls
)
2624 timevar_push (TV_JUMP
);
2625 open_dump_file (DFI_sibling
, decl
);
2627 optimize_sibling_and_tail_recursive_calls ();
2629 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2630 timevar_pop (TV_JUMP
);
2633 /* Complete generation of exception handling code. */
2634 find_exception_handler_labels ();
2637 timevar_push (TV_JUMP
);
2638 open_dump_file (DFI_eh
, decl
);
2640 finish_eh_generation ();
2642 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2643 timevar_pop (TV_JUMP
);
2647 /* If we are doing position-independent code generation, now
2648 is the time to output special prologues and epilogues.
2649 We do not want to do this earlier, because it just clutters
2650 up inline functions with meaningless insns. */
2655 insns
= get_insns ();
2657 /* Copy any shared structure that should not be shared. */
2658 unshare_all_rtl (current_function_decl
, insns
);
2660 #ifdef SETJMP_VIA_SAVE_AREA
2661 /* This must be performed before virtual register instantiation. */
2662 if (current_function_calls_alloca
)
2663 optimize_save_area_alloca (insns
);
2666 /* Instantiate all virtual registers. */
2667 instantiate_virtual_regs (current_function_decl
, insns
);
2669 open_dump_file (DFI_jump
, decl
);
2671 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2672 are initialized and to compute whether control can drop off the end
2675 timevar_push (TV_JUMP
);
2676 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2677 before jump optimization switches branch directions. */
2678 expected_value_to_br_prob ();
2680 reg_scan (insns
, max_reg_num (), 0);
2681 rebuild_jump_labels (insns
);
2682 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2683 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
);
2685 /* CFG is no longer maintained up-to-date. */
2686 free_bb_for_insn ();
2687 copy_loop_headers (insns
);
2688 purge_line_number_notes (insns
);
2690 timevar_pop (TV_JUMP
);
2692 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2693 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2695 close_dump_file (DFI_jump
, print_rtl
, insns
);
2696 goto exit_rest_of_compilation
;
2699 /* Long term, this should probably move before the jump optimizer too,
2700 but I didn't want to disturb the rtl_dump_and_exit and related
2701 stuff at this time. */
2702 if (optimize
> 0 && flag_ssa
)
2704 /* Convert to SSA form. */
2706 timevar_push (TV_TO_SSA
);
2707 open_dump_file (DFI_ssa
, decl
);
2709 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2710 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2713 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2714 timevar_pop (TV_TO_SSA
);
2716 /* Perform sparse conditional constant propagation, if requested. */
2719 timevar_push (TV_SSA_CCP
);
2720 open_dump_file (DFI_ssa_ccp
, decl
);
2724 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2725 timevar_pop (TV_SSA_CCP
);
2728 /* It would be useful to cleanup the CFG at this point, but block
2729 merging and possibly other transformations might leave a PHI
2730 node in the middle of a basic block, which is a strict no-no. */
2732 /* The SSA implementation uses basic block numbers in its phi
2733 nodes. Thus, changing the control-flow graph or the basic
2734 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2735 may cause problems. */
2739 /* Remove dead code. */
2741 timevar_push (TV_SSA_DCE
);
2742 open_dump_file (DFI_ssa_dce
, decl
);
2744 insns
= get_insns ();
2745 ssa_eliminate_dead_code();
2747 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2748 timevar_pop (TV_SSA_DCE
);
2751 /* Convert from SSA form. */
2753 timevar_push (TV_FROM_SSA
);
2754 open_dump_file (DFI_ussa
, decl
);
2756 convert_from_ssa ();
2757 /* New registers have been created. Rescan their usage. */
2758 reg_scan (insns
, max_reg_num (), 1);
2760 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2761 timevar_pop (TV_FROM_SSA
);
2764 /* CFG is no longer maintained up-to-date. */
2765 free_bb_for_insn ();
2768 timevar_push (TV_JUMP
);
2772 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2773 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2775 /* ??? Run if-conversion before delete_null_pointer_checks,
2776 since the later does not preserve the CFG. This should
2777 be changed -- no since converting if's that are going to
2779 timevar_push (TV_IFCVT
);
2781 timevar_pop (TV_IFCVT
);
2783 /* CFG is no longer maintained up-to-date. */
2784 free_bb_for_insn ();
2785 /* Try to identify useless null pointer tests and delete them. */
2786 if (flag_delete_null_pointer_checks
)
2787 delete_null_pointer_checks (insns
);
2790 /* Jump optimization, and the removal of NULL pointer checks, may
2791 have reduced the number of instructions substantially. CSE, and
2792 future passes, allocate arrays whose dimensions involve the
2793 maximum instruction UID, so if we can reduce the maximum UID
2794 we'll save big on memory. */
2795 renumber_insns (rtl_dump_file
);
2796 timevar_pop (TV_JUMP
);
2798 close_dump_file (DFI_jump
, print_rtl
, insns
);
2802 /* Perform common subexpression elimination.
2803 Nonzero value from `cse_main' means that jumps were simplified
2804 and some code may now be unreachable, so do
2805 jump optimization again. */
2809 open_dump_file (DFI_cse
, decl
);
2810 timevar_push (TV_CSE
);
2812 reg_scan (insns
, max_reg_num (), 1);
2814 if (flag_thread_jumps
)
2816 timevar_push (TV_JUMP
);
2817 thread_jumps (insns
, max_reg_num (), 1);
2818 timevar_pop (TV_JUMP
);
2821 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2823 /* If we are not running more CSE passes, then we are no longer
2824 expecting CSE to be run. But always rerun it in a cheap mode. */
2825 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2827 if (tem
|| optimize
> 1)
2829 timevar_push (TV_JUMP
);
2830 rebuild_jump_labels (insns
);
2831 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2832 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2833 timevar_pop (TV_JUMP
);
2834 /* CFG is no longer maintained up-to-date. */
2835 free_bb_for_insn ();
2838 /* Run this after jump optmizations remove all the unreachable code
2839 so that unreachable code will not keep values live. */
2840 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2842 /* Try to identify useless null pointer tests and delete them. */
2843 if (flag_delete_null_pointer_checks
)
2845 timevar_push (TV_JUMP
);
2846 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2848 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2850 delete_null_pointer_checks (insns
);
2851 /* CFG is no longer maintained up-to-date. */
2852 free_bb_for_insn ();
2853 timevar_pop (TV_JUMP
);
2856 /* The second pass of jump optimization is likely to have
2857 removed a bunch more instructions. */
2858 renumber_insns (rtl_dump_file
);
2860 timevar_pop (TV_CSE
);
2861 close_dump_file (DFI_cse
, print_rtl
, insns
);
2864 open_dump_file (DFI_addressof
, decl
);
2866 purge_addressof (insns
);
2867 reg_scan (insns
, max_reg_num (), 1);
2869 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2873 /* Perform global cse. */
2875 if (optimize
> 0 && flag_gcse
)
2877 int save_csb
, save_cfj
;
2880 timevar_push (TV_GCSE
);
2881 open_dump_file (DFI_gcse
, decl
);
2883 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2884 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2885 tem
= gcse_main (insns
, rtl_dump_file
);
2887 save_csb
= flag_cse_skip_blocks
;
2888 save_cfj
= flag_cse_follow_jumps
;
2889 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2891 /* CFG is no longer maintained up-to-date. */
2892 free_bb_for_insn ();
2893 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2895 if (flag_expensive_optimizations
)
2897 timevar_push (TV_CSE
);
2898 reg_scan (insns
, max_reg_num (), 1);
2899 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2900 timevar_pop (TV_CSE
);
2901 cse_not_expected
= !flag_rerun_cse_after_loop
;
2904 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2905 things up. Then possibly re-run CSE again. */
2909 timevar_push (TV_JUMP
);
2910 rebuild_jump_labels (insns
);
2911 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2912 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2913 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2914 /* CFG is no longer maintained up-to-date. */
2915 free_bb_for_insn ();
2916 timevar_pop (TV_JUMP
);
2918 if (flag_expensive_optimizations
)
2920 timevar_push (TV_CSE
);
2921 reg_scan (insns
, max_reg_num (), 1);
2922 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2923 timevar_pop (TV_CSE
);
2927 close_dump_file (DFI_gcse
, print_rtl
, insns
);
2928 timevar_pop (TV_GCSE
);
2931 flag_cse_skip_blocks
= save_csb
;
2932 flag_cse_follow_jumps
= save_cfj
;
2935 /* Move constant computations out of loops. */
2939 timevar_push (TV_LOOP
);
2940 open_dump_file (DFI_loop
, decl
);
2941 free_bb_for_insn ();
2943 if (flag_rerun_loop_opt
)
2945 cleanup_barriers ();
2947 /* We only want to perform unrolling once. */
2949 loop_optimize (insns
, rtl_dump_file
, 0);
2951 /* The first call to loop_optimize makes some instructions
2952 trivially dead. We delete those instructions now in the
2953 hope that doing so will make the heuristics in loop work
2954 better and possibly speed up compilation. */
2955 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2957 /* The regscan pass is currently necessary as the alias
2958 analysis code depends on this information. */
2959 reg_scan (insns
, max_reg_num (), 1);
2961 cleanup_barriers ();
2962 loop_optimize (insns
, rtl_dump_file
,
2963 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
2965 close_dump_file (DFI_loop
, print_rtl
, insns
);
2966 timevar_pop (TV_LOOP
);
2973 timevar_push (TV_CSE2
);
2974 open_dump_file (DFI_cse2
, decl
);
2976 if (flag_rerun_cse_after_loop
)
2978 /* Running another jump optimization pass before the second
2979 cse pass sometimes simplifies the RTL enough to allow
2980 the second CSE pass to do a better job. Jump_optimize can change
2981 max_reg_num so we must rerun reg_scan afterwards.
2982 ??? Rework to not call reg_scan so often. */
2983 timevar_push (TV_JUMP
);
2985 /* The previous call to loop_optimize makes some instructions
2986 trivially dead. We delete those instructions now in the
2987 hope that doing so will make the heuristics in jump work
2988 better and possibly speed up compilation. */
2989 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2991 reg_scan (insns
, max_reg_num (), 0);
2993 timevar_push (TV_IFCVT
);
2995 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2996 cleanup_cfg (CLEANUP_EXPENSIVE
);
2999 timevar_pop(TV_IFCVT
);
3001 timevar_pop (TV_JUMP
);
3003 /* CFG is no longer maintained up-to-date. */
3004 free_bb_for_insn ();
3005 reg_scan (insns
, max_reg_num (), 0);
3006 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
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
);
3014 /* CFG is no longer maintained up-to-date. */
3015 free_bb_for_insn ();
3016 timevar_pop (TV_JUMP
);
3020 if (flag_thread_jumps
)
3022 /* This pass of jump threading straightens out code
3023 that was kinked by loop optimization. */
3024 timevar_push (TV_JUMP
);
3025 reg_scan (insns
, max_reg_num (), 0);
3026 thread_jumps (insns
, max_reg_num (), 0);
3027 timevar_pop (TV_JUMP
);
3030 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3031 timevar_pop (TV_CSE2
);
3036 cse_not_expected
= 1;
3040 /* Do control and data flow analysis; wrote some of the results to
3043 timevar_push (TV_FLOW
);
3044 open_dump_file (DFI_cfg
, decl
);
3046 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3047 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3048 check_function_return_warnings ();
3050 /* It may make more sense to mark constant functions after dead code is
3051 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3052 may insert code making function non-constant, but we still must consider
3053 it as constant, otherwise -fbranch-probabilities will not read data back.
3055 life_analyzis rarely eliminates modification of external memory.
3057 mark_constant_function ();
3059 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3061 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3063 timevar_push (TV_BRANCH_PROB
);
3064 open_dump_file (DFI_bp
, decl
);
3068 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3069 timevar_pop (TV_BRANCH_PROB
);
3072 open_dump_file (DFI_life
, decl
);
3077 /* Discover and record the loop depth at the head of each basic
3078 block. The loop infrastructure does the real job for us. */
3079 flow_loops_find (&loops
, LOOP_TREE
);
3081 /* Estimate using heuristics if no profiling info is available. */
3082 if (flag_guess_branch_prob
)
3083 estimate_probability (&loops
);
3086 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3088 flow_loops_free (&loops
);
3090 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3091 timevar_pop (TV_FLOW
);
3095 if (warn_uninitialized
|| extra_warnings
)
3097 uninitialized_vars_warning (DECL_INITIAL (decl
));
3099 setjmp_args_warning ();
3102 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3106 /* If -opt, try combining insns through substitution. */
3110 int rebuild_jump_labels_after_combine
= 0;
3112 timevar_push (TV_COMBINE
);
3113 open_dump_file (DFI_combine
, decl
);
3115 rebuild_jump_labels_after_combine
3116 = combine_instructions (insns
, max_reg_num ());
3118 /* Always purge dead edges, as we may eliminate an insn throwing
3120 rebuild_jump_labels_after_combine
|= purge_all_dead_edges (true);
3122 /* Combining insns may have turned an indirect jump into a
3123 direct jump. Rebuid the JUMP_LABEL fields of jumping
3125 if (rebuild_jump_labels_after_combine
)
3127 timevar_push (TV_JUMP
);
3128 rebuild_jump_labels (insns
);
3129 timevar_pop (TV_JUMP
);
3131 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3134 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3135 timevar_pop (TV_COMBINE
);
3140 /* Rerun if-conversion, as combine may have simplified things enough to
3141 now meet sequence length restrictions. */
3144 timevar_push (TV_IFCVT
);
3145 open_dump_file (DFI_ce
, decl
);
3151 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3152 timevar_pop (TV_IFCVT
);
3155 /* Register allocation pre-pass, to reduce number of moves
3156 necessary for two-address machines. */
3157 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3159 timevar_push (TV_REGMOVE
);
3160 open_dump_file (DFI_regmove
, decl
);
3162 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3164 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3165 timevar_pop (TV_REGMOVE
);
3170 /* Do unconditional splitting before register allocation to allow machine
3171 description to add extra information not needed previously. */
3172 split_all_insns (1);
3174 /* Any of the several passes since flow1 will have munged register
3175 lifetime data a bit. */
3176 register_life_up_to_date
= 0;
3178 #ifdef OPTIMIZE_MODE_SWITCHING
3179 timevar_push (TV_MODE_SWITCH
);
3182 if (optimize_mode_switching (NULL
))
3184 /* We did work, and so had to regenerate global life information.
3185 Take advantage of this and don't re-recompute register life
3186 information below. */
3187 register_life_up_to_date
= 1;
3191 timevar_pop (TV_MODE_SWITCH
);
3194 timevar_push (TV_SCHED
);
3196 #ifdef INSN_SCHEDULING
3198 /* Print function header into sched dump now
3199 because doing the sched analysis makes some of the dump. */
3200 if (optimize
> 0 && flag_schedule_insns
)
3202 open_dump_file (DFI_sched
, decl
);
3204 /* Do control and data sched analysis,
3205 and write some of the results to dump file. */
3207 schedule_insns (rtl_dump_file
);
3209 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3211 /* Register lifetime information was updated as part of verifying
3213 register_life_up_to_date
= 1;
3216 timevar_pop (TV_SCHED
);
3220 /* Determine if the current function is a leaf before running reload
3221 since this can impact optimizations done by the prologue and
3222 epilogue thus changing register elimination offsets. */
3223 current_function_is_leaf
= leaf_function_p ();
3225 timevar_push (TV_LOCAL_ALLOC
);
3226 open_dump_file (DFI_lreg
, decl
);
3228 /* Allocate pseudo-regs that are used only within 1 basic block.
3230 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3231 jump optimizer after register allocation and reloading are finished. */
3233 if (! register_life_up_to_date
)
3234 recompute_reg_usage (insns
, ! optimize_size
);
3236 /* Allocate the reg_renumber array. */
3237 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3239 /* And the reg_equiv_memory_loc array. */
3240 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3242 allocate_initial_values (reg_equiv_memory_loc
);
3244 regclass (insns
, max_reg_num (), rtl_dump_file
);
3245 rebuild_label_notes_after_reload
= local_alloc ();
3247 timevar_pop (TV_LOCAL_ALLOC
);
3249 if (dump_file
[DFI_lreg
].enabled
)
3251 timevar_push (TV_DUMP
);
3253 dump_flow_info (rtl_dump_file
);
3254 dump_local_alloc (rtl_dump_file
);
3256 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3257 timevar_pop (TV_DUMP
);
3262 timevar_push (TV_GLOBAL_ALLOC
);
3263 open_dump_file (DFI_greg
, decl
);
3265 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3266 pass fixing up any insns that are invalid. */
3269 failure
= global_alloc (rtl_dump_file
);
3272 build_insn_chain (insns
);
3273 failure
= reload (insns
, 0);
3276 timevar_pop (TV_GLOBAL_ALLOC
);
3278 if (dump_file
[DFI_greg
].enabled
)
3280 timevar_push (TV_DUMP
);
3282 dump_global_regs (rtl_dump_file
);
3284 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3285 timevar_pop (TV_DUMP
);
3289 goto exit_rest_of_compilation
;
3293 open_dump_file (DFI_postreload
, decl
);
3295 /* Do a very simple CSE pass over just the hard registers. */
3298 timevar_push (TV_RELOAD_CSE_REGS
);
3299 reload_cse_regs (insns
);
3300 timevar_pop (TV_RELOAD_CSE_REGS
);
3303 /* Register allocation and reloading may have turned an indirect jump into
3304 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3305 jumping instructions. */
3306 if (rebuild_label_notes_after_reload
)
3308 timevar_push (TV_JUMP
);
3310 rebuild_jump_labels (insns
);
3312 timevar_pop (TV_JUMP
);
3315 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3317 /* Re-create the death notes which were deleted during reload. */
3318 timevar_push (TV_FLOW2
);
3319 open_dump_file (DFI_flow2
, decl
);
3321 #ifdef ENABLE_CHECKING
3322 verify_flow_info ();
3325 /* If optimizing, then go ahead and split insns now. */
3327 split_all_insns (0);
3329 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3331 /* On some machines, the prologue and epilogue code, or parts thereof,
3332 can be represented as RTL. Doing so lets us schedule insns between
3333 it and the rest of the code and also allows delayed branch
3334 scheduling to operate in the epilogue. */
3335 thread_prologue_and_epilogue_insns (insns
);
3339 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
);
3340 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3342 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3343 even for machines with possibly nonzero RETURN_POPS_ARGS
3344 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3345 push instructions will have popping returns. */
3346 #ifndef PUSH_ROUNDING
3347 if (!ACCUMULATE_OUTGOING_ARGS
)
3349 combine_stack_adjustments ();
3354 flow2_completed
= 1;
3356 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3357 timevar_pop (TV_FLOW2
);
3359 #ifdef HAVE_peephole2
3360 if (optimize
> 0 && flag_peephole2
)
3362 timevar_push (TV_PEEPHOLE2
);
3363 open_dump_file (DFI_peephole2
, decl
);
3365 peephole2_optimize (rtl_dump_file
);
3367 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3368 timevar_pop (TV_PEEPHOLE2
);
3372 if (optimize
> 0 && flag_rename_registers
)
3374 timevar_push (TV_RENAME_REGISTERS
);
3375 open_dump_file (DFI_rnreg
, decl
);
3377 regrename_optimize ();
3379 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3380 timevar_pop (TV_RENAME_REGISTERS
);
3385 timevar_push (TV_IFCVT2
);
3386 open_dump_file (DFI_ce2
, decl
);
3390 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3391 timevar_pop (TV_IFCVT2
);
3395 split_all_insns (1);
3398 #ifdef INSN_SCHEDULING
3399 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3401 timevar_push (TV_SCHED2
);
3402 open_dump_file (DFI_sched2
, decl
);
3404 /* Do control and data sched analysis again,
3405 and write some more of the results to dump file. */
3407 split_all_insns (1);
3409 schedule_insns (rtl_dump_file
);
3411 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3412 timevar_pop (TV_SCHED2
);
3418 #ifdef LEAF_REGISTERS
3419 current_function_uses_only_leaf_regs
3420 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3424 timevar_push (TV_REG_STACK
);
3425 open_dump_file (DFI_stack
, decl
);
3427 reg_to_stack (insns
, rtl_dump_file
);
3429 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3430 timevar_pop (TV_REG_STACK
);
3436 timevar_push (TV_REORDER_BLOCKS
);
3437 open_dump_file (DFI_bbro
, decl
);
3439 /* Last attempt to optimize CFG, as life analyzis possibly removed
3440 some instructions. */
3441 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3442 | CLEANUP_CROSSJUMP
);
3443 if (flag_reorder_blocks
)
3445 reorder_basic_blocks ();
3446 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3449 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3450 timevar_pop (TV_REORDER_BLOCKS
);
3452 compute_alignments ();
3454 /* CFG is no longer maintained up-to-date. */
3455 free_bb_for_insn ();
3457 /* If a machine dependent reorganization is needed, call it. */
3458 #ifdef MACHINE_DEPENDENT_REORG
3459 timevar_push (TV_MACH_DEP
);
3460 open_dump_file (DFI_mach
, decl
);
3462 MACHINE_DEPENDENT_REORG (insns
);
3464 close_dump_file (DFI_mach
, print_rtl
, insns
);
3465 timevar_pop (TV_MACH_DEP
);
3470 purge_line_number_notes (insns
);
3471 cleanup_barriers ();
3473 /* If a scheduling pass for delayed branches is to be done,
3474 call the scheduling code. */
3477 if (optimize
> 0 && flag_delayed_branch
)
3479 timevar_push (TV_DBR_SCHED
);
3480 open_dump_file (DFI_dbr
, decl
);
3482 dbr_schedule (insns
, rtl_dump_file
);
3484 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3485 timevar_pop (TV_DBR_SCHED
);
3491 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3492 timevar_push (TV_SHORTEN_BRANCH
);
3493 split_all_insns_noflow ();
3494 timevar_pop (TV_SHORTEN_BRANCH
);
3497 convert_to_eh_region_ranges ();
3499 /* Shorten branches. */
3500 timevar_push (TV_SHORTEN_BRANCH
);
3501 shorten_branches (get_insns ());
3502 timevar_pop (TV_SHORTEN_BRANCH
);
3504 current_function_nothrow
= nothrow_function_p ();
3505 if (current_function_nothrow
)
3506 /* Now we know that this can't throw; set the flag for the benefit
3507 of other functions later in this translation unit. */
3508 TREE_NOTHROW (current_function_decl
) = 1;
3510 /* Now turn the rtl into assembler code. */
3512 timevar_push (TV_FINAL
);
3517 /* Get the function's name, as described by its RTL. This may be
3518 different from the DECL_NAME name used in the source file. */
3520 x
= DECL_RTL (decl
);
3521 if (GET_CODE (x
) != MEM
)
3524 if (GET_CODE (x
) != SYMBOL_REF
)
3526 fnname
= XSTR (x
, 0);
3528 assemble_start_function (decl
, fnname
);
3529 final_start_function (insns
, asm_out_file
, optimize
);
3530 final (insns
, asm_out_file
, optimize
, 0);
3531 final_end_function ();
3533 #ifdef IA64_UNWIND_INFO
3534 /* ??? The IA-64 ".handlerdata" directive must be issued before
3535 the ".endp" directive that closes the procedure descriptor. */
3536 output_function_exception_table ();
3539 assemble_end_function (decl
, fnname
);
3541 #ifndef IA64_UNWIND_INFO
3542 /* Otherwise, it feels unclean to switch sections in the middle. */
3543 output_function_exception_table ();
3547 fflush (asm_out_file
);
3549 /* Release all memory allocated by flow. */
3550 free_basic_block_vars (0);
3552 /* Release all memory held by regsets now. */
3553 regset_release_memory ();
3555 timevar_pop (TV_FINAL
);
3559 /* Write DBX symbols if requested. */
3561 /* Note that for those inline functions where we don't initially
3562 know for certain that we will be generating an out-of-line copy,
3563 the first invocation of this routine (rest_of_compilation) will
3564 skip over this code by doing a `goto exit_rest_of_compilation;'.
3565 Later on, finish_compilation will call rest_of_compilation again
3566 for those inline functions that need to have out-of-line copies
3567 generated. During that call, we *will* be routed past here. */
3569 timevar_push (TV_SYMOUT
);
3570 (*debug_hooks
->function_decl
) (decl
);
3571 timevar_pop (TV_SYMOUT
);
3573 exit_rest_of_compilation
:
3575 /* In case the function was not output,
3576 don't leave any temporary anonymous types
3577 queued up for sdb output. */
3578 #ifdef SDB_DEBUGGING_INFO
3579 if (write_symbols
== SDB_DEBUG
)
3580 sdbout_types (NULL_TREE
);
3583 reload_completed
= 0;
3584 flow2_completed
= 0;
3587 timevar_push (TV_FINAL
);
3589 /* Clear out the insn_length contents now that they are no
3591 init_insn_lengths ();
3593 /* Clear out the real_constant_chain before some of the rtx's
3594 it runs through become garbage. */
3595 clear_const_double_mem ();
3597 /* Show no temporary slots allocated. */
3600 free_basic_block_vars (0);
3602 timevar_pop (TV_FINAL
);
3604 /* Make sure volatile mem refs aren't considered valid operands for
3605 arithmetic insns. We must call this here if this is a nested inline
3606 function, since the above code leaves us in the init_recog state
3607 (from final.c), and the function context push/pop code does not
3608 save/restore volatile_ok.
3610 ??? Maybe it isn't necessary for expand_start_function to call this
3611 anymore if we do it here? */
3613 init_recog_no_volatile ();
3615 /* We're done with this function. Free up memory if we can. */
3616 free_after_parsing (cfun
);
3617 if (! DECL_DEFER_OUTPUT (decl
))
3619 free_after_compilation (cfun
);
3621 /* Clear integrate.c's pointer to the cfun structure we just
3623 DECL_SAVED_INSNS (decl
) = 0;
3629 timevar_pop (TV_REST_OF_COMPILATION
);
3639 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3640 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3641 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3642 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3643 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3644 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"));
3646 for (i
= ARRAY_SIZE (f_options
); i
--;)
3648 const char *description
= f_options
[i
].description
;
3650 if (description
!= NULL
&& * description
!= 0)
3651 printf (" -f%-21s %s\n",
3652 f_options
[i
].string
, _(description
));
3655 printf (_(" -O[number] Set optimisation level to [number]\n"));
3656 printf (_(" -Os Optimise for space rather than speed\n"));
3657 for (i
= LAST_PARAM
; i
--;)
3659 const char *description
= compiler_params
[i
].help
;
3660 const int length
= 21-strlen(compiler_params
[i
].option
);
3662 if (description
!= NULL
&& * description
!= 0)
3663 printf (" --param %s=<value>%.*s%s\n",
3664 compiler_params
[i
].option
,
3665 length
> 0 ? length
: 1, " ",
3668 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3669 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3670 printf (_(" -w Suppress warnings\n"));
3671 printf (_(" -W Enable extra warnings\n"));
3673 for (i
= ARRAY_SIZE (W_options
); i
--;)
3675 const char *description
= W_options
[i
].description
;
3677 if (description
!= NULL
&& * description
!= 0)
3678 printf (" -W%-21s %s\n",
3679 W_options
[i
].string
, _(description
));
3682 printf (_(" -Wunused Enable unused warnings\n"));
3683 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3684 printf (_(" -p Enable function profiling\n"));
3685 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3686 printf (_(" -a Enable block profiling \n"));
3688 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3689 printf (_(" -ax Enable jump profiling \n"));
3691 printf (_(" -o <file> Place output into <file> \n"));
3693 -G <number> Put global and static data smaller than <number>\n\
3694 bytes into a special section (on some targets)\n"));
3696 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3698 if (debug_args
[i
].description
!= NULL
)
3699 printf (" -g%-21s %s\n",
3700 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3703 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3704 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3705 printf (_(" -version Display the compiler's version\n"));
3706 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3707 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3708 #if defined INSN_SCHEDULING
3709 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3711 printf (_(" --help Display this information\n"));
3716 /* Display descriptions of language specific options.
3717 If there is no description, note that there is an undocumented option.
3718 If the description is empty, do not display anything. (This allows
3719 options to be deliberately undocumented, for whatever reason).
3720 If the option string is missing, then this is a marker, indicating
3721 that the description string is in fact the name of a language, whose
3722 language specific options are to follow. */
3724 if (ARRAY_SIZE (documented_lang_options
) > 1)
3726 printf (_("\nLanguage specific options:\n"));
3728 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3730 const char *description
= documented_lang_options
[i
].description
;
3731 const char *option
= documented_lang_options
[i
].option
;
3733 if (description
== NULL
)
3738 printf (_(" %-23.23s [undocumented]\n"), option
);
3740 else if (*description
== 0)
3742 else if (option
== NULL
)
3746 (_("\nThere are undocumented %s specific options as well.\n"),
3750 printf (_("\n Options for %s:\n"), description
);
3755 printf (" %-23.23s %s\n", option
, _(description
));
3760 printf (_("\nThere are undocumented %s specific options as well.\n"),
3763 display_target_options ();
3767 display_target_options ()
3771 if (ARRAY_SIZE (target_switches
) > 1
3772 #ifdef TARGET_OPTIONS
3773 || ARRAY_SIZE (target_options
) > 1
3781 printf (_("\nTarget specific options:\n"));
3783 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3785 const char *option
= target_switches
[i
].name
;
3786 const char *description
= target_switches
[i
].description
;
3788 if (option
== NULL
|| *option
== 0)
3790 else if (description
== NULL
)
3795 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3797 else if (* description
!= 0)
3798 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3801 #ifdef TARGET_OPTIONS
3802 for (i
= ARRAY_SIZE (target_options
); i
--;)
3804 const char *option
= target_options
[i
].prefix
;
3805 const char *description
= target_options
[i
].description
;
3807 if (option
== NULL
|| *option
== 0)
3809 else if (description
== NULL
)
3814 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3816 else if (* description
!= 0)
3817 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3823 printf (_("\nThere are undocumented target specific options as well.\n"));
3825 printf (_(" They exist, but they are not documented.\n"));
3830 /* Parse a -d... command line switch. */
3833 decode_d_option (arg
)
3842 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3843 dump_file
[i
].enabled
= 1;
3849 flag_print_asm_name
= 1;
3852 flag_dump_rtl_in_asm
= 1;
3853 flag_print_asm_name
= 1;
3856 graph_dump_format
= vcg
;
3859 rtl_dump_and_exit
= 1;
3862 (*lang_hooks
.set_yydebug
) (1);
3864 case 'D': /* These are handled by the preprocessor. */
3870 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3871 if (c
== dump_file
[i
].debug_switch
)
3873 dump_file
[i
].enabled
= 1;
3878 warning ("unrecognized gcc debugging option: %c", c
);
3883 /* Parse a -f... command line switch. ARG is the value after the -f.
3884 It is safe to access 'ARG - 2' to generate the full switch name.
3885 Return the number of strings consumed. */
3888 decode_f_option (arg
)
3892 const char *option_value
= NULL
;
3894 /* Search for the option in the table of binary f options. */
3895 for (j
= ARRAY_SIZE (f_options
); j
--;)
3897 if (!strcmp (arg
, f_options
[j
].string
))
3899 *f_options
[j
].variable
= f_options
[j
].on_value
;
3903 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3904 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3906 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3911 if (!strcmp (arg
, "fast-math"))
3912 set_fast_math_flags();
3913 else if (!strcmp (arg
, "no-fast-math"))
3914 set_no_fast_math_flags();
3915 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3916 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3919 read_integral_parameter (option_value
, arg
- 2,
3921 set_param_value ("max-inline-insns", val
);
3923 #ifdef INSN_SCHEDULING
3924 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3925 fix_sched_param ("verbose", option_value
);
3927 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3928 fix_register (option_value
, 1, 1);
3929 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3930 fix_register (option_value
, 0, 1);
3931 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3932 fix_register (option_value
, 0, 0);
3933 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3934 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3935 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3937 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3938 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3939 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3940 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3942 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3943 else if ((option_value
3944 = skip_leading_substring (arg
, "stack-limit-register=")))
3946 int reg
= decode_reg_name (option_value
);
3948 error ("unrecognized register name `%s'", option_value
);
3950 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3952 else if ((option_value
3953 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3956 nm
= ggc_strdup (option_value
);
3957 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3959 else if ((option_value
3960 = skip_leading_substring (arg
, "message-length=")))
3961 output_set_maximum_length
3962 (&global_dc
->buffer
, read_integral_parameter
3963 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3964 else if ((option_value
3965 = skip_leading_substring (arg
, "diagnostics-show-location=")))
3967 if (!strcmp (option_value
, "once"))
3968 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
3969 else if (!strcmp (option_value
, "every-line"))
3970 diagnostic_prefixing_rule (global_dc
)
3971 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
3973 error ("Unrecognized option `%s'", arg
- 2);
3975 else if (!strcmp (arg
, "no-stack-limit"))
3976 stack_limit_rtx
= NULL_RTX
;
3977 else if (!strcmp (arg
, "preprocessed"))
3978 /* Recognise this switch but do nothing. This prevents warnings
3979 about an unrecognized switch if cpplib has not been linked in. */
3987 /* Parse a -W... command line switch. ARG is the value after the -W.
3988 It is safe to access 'ARG - 2' to generate the full switch name.
3989 Return the number of strings consumed. */
3992 decode_W_option (arg
)
3995 const char *option_value
= NULL
;
3998 /* Search for the option in the table of binary W options. */
4000 for (j
= ARRAY_SIZE (W_options
); j
--;)
4002 if (!strcmp (arg
, W_options
[j
].string
))
4004 *W_options
[j
].variable
= W_options
[j
].on_value
;
4008 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4009 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4011 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4016 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4017 warning ("-Wid-clash-LEN is no longer supported");
4018 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4020 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4022 warn_larger_than
= larger_than_size
!= -1;
4024 else if (!strcmp (arg
, "unused"))
4028 else if (!strcmp (arg
, "no-unused"))
4038 /* Parse a -g... command line switch. ARG is the value after the -g.
4039 It is safe to access 'ARG - 2' to generate the full switch name.
4040 Return the number of strings consumed. */
4043 decode_g_option (arg
)
4046 static unsigned level
=0;
4047 /* A lot of code assumes write_symbols == NO_DEBUG if the
4048 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4049 of what debugging type has been selected). This records the
4050 selected type. It is an error to specify more than one
4052 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4053 /* Non-zero if debugging format has been explicitly set.
4054 -g and -ggdb don't explicitly set the debugging format so
4055 -gdwarf -g3 is equivalent to -gdwarf3. */
4056 static int type_explicitly_set_p
= 0;
4057 /* Indexed by enum debug_info_type. */
4058 static const char *const debug_type_names
[] =
4060 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4063 /* The maximum admissible debug level value. */
4064 static const unsigned max_debug_level
= 3;
4066 /* Look up ARG in the table. */
4067 for (da
= debug_args
; da
->arg
; da
++)
4069 const int da_len
= strlen (da
->arg
);
4071 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4073 enum debug_info_type type
= da
->debug_type
;
4074 const char *p
= arg
+ da_len
;
4076 if (*p
&& ! ISDIGIT (*p
))
4079 /* A debug flag without a level defaults to level 2.
4080 Note we do not want to call read_integral_parameter
4081 for that case since it will call atoi which
4084 ??? We may want to generalize the interface to
4085 read_integral_parameter to better handle this case
4086 if this case shows up often. */
4088 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4090 level
= (level
== 0) ? 2 : level
;
4092 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4094 error ("use -gdwarf -g%d for DWARF v1, level %d",
4097 error ("use -gdwarf-2 for DWARF v2");
4100 if (level
> max_debug_level
)
4103 ignoring option `%s' due to invalid debug level specification",
4105 level
= debug_info_level
;
4108 if (type
== NO_DEBUG
)
4110 type
= PREFERRED_DEBUGGING_TYPE
;
4112 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4114 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4115 type
= DWARF2_DEBUG
;
4117 #ifdef DBX_DEBUGGING_INFO
4124 if (type
== NO_DEBUG
)
4125 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4127 /* Does it conflict with an already selected type? */
4128 if (type_explicitly_set_p
4129 /* -g/-ggdb don't conflict with anything. */
4130 && da
->debug_type
!= NO_DEBUG
4131 && type
!= selected_debug_type
)
4132 warning ("`%s' ignored, conflicts with `-g%s'",
4133 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4136 /* If the format has already been set, -g/-ggdb
4137 only change the debug level. */
4138 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4139 /* Don't change debugging type. */
4143 selected_debug_type
= type
;
4144 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4147 write_symbols
= (level
== 0
4149 : selected_debug_type
);
4150 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4151 debug_info_level
= (enum debug_info_level
) level
;
4164 /* Decode the first argument in the argv as a language-independent option.
4165 Return the number of strings consumed. */
4168 independent_decode_option (argc
, argv
)
4172 char *arg
= argv
[0];
4174 if (arg
[0] != '-' || arg
[1] == 0)
4186 if (!strcmp (arg
, "-help"))
4189 exit_after_options
= 1;
4192 if (!strcmp (arg
, "-target-help"))
4194 display_target_options ();
4195 exit_after_options
= 1;
4198 if (!strcmp (arg
, "-version"))
4200 print_version (stderr
, "");
4201 exit_after_options
= 1;
4204 /* Handle '--param <name>=<value>'. */
4205 if (strcmp (arg
, "-param") == 0)
4211 error ("-param option missing argument");
4215 /* Get the '<name>=<value>' parameter. */
4217 /* Look for the `='. */
4218 equal
= strchr (arg
, '=');
4220 error ("invalid --param option: %s", arg
);
4225 /* Zero out the `=' sign so that we get two separate strings. */
4227 /* Figure out what value is specified. */
4228 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4229 if (val
!= INVALID_PARAM_VAL
)
4230 set_param_value (arg
, val
);
4232 error ("invalid parameter value `%s'", equal
+ 1);
4247 /* Already been treated in main (). Do nothing. */
4251 set_target_switch (arg
+ 1);
4255 return decode_f_option (arg
+ 1);
4258 return decode_g_option (arg
+ 1);
4261 if (!strcmp (arg
, "dumpbase"))
4266 dump_base_name
= argv
[1];
4270 decode_d_option (arg
+ 1);
4274 if (!strcmp (arg
, "pedantic"))
4276 else if (!strcmp (arg
, "pedantic-errors"))
4277 flag_pedantic_errors
= pedantic
= 1;
4278 else if (arg
[1] == 0)
4285 if (!strcmp (arg
, "quiet"))
4292 if (!strcmp (arg
, "version"))
4300 inhibit_warnings
= 1;
4309 /* We save the value of warn_uninitialized, since if they put
4310 -Wuninitialized on the command line, we need to generate a
4311 warning about not using it without also specifying -O. */
4312 if (warn_uninitialized
!= 1)
4313 warn_uninitialized
= 2;
4316 return decode_W_option (arg
+ 1);
4322 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4323 warning ("`-a' option (basic block profile) not supported");
4325 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4328 else if (!strcmp (arg
, "ax"))
4330 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4331 warning ("`-ax' option (jump profiling) not supported");
4333 profile_block_flag
= (!profile_block_flag
4334 || profile_block_flag
== 2) ? 2 : 3;
4337 else if (!strncmp (arg
, "aux-info", 8))
4344 aux_info_file_name
= argv
[1];
4345 flag_gen_aux_info
= 1;
4348 else if (arg
[8] == '=')
4350 aux_info_file_name
= arg
+ 9;
4351 flag_gen_aux_info
= 1;
4366 asm_file_name
= argv
[1];
4381 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4386 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4390 if (g_switch_val
== -1)
4394 g_switch_set
= TRUE
;
4395 g_switch_value
= g_switch_val
;
4405 /* Decode -m switches. */
4406 /* Decode the switch -mNAME. */
4409 set_target_switch (name
)
4413 int valid_target_option
= 0;
4415 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4416 if (!strcmp (target_switches
[j
].name
, name
))
4418 if (target_switches
[j
].value
< 0)
4419 target_flags
&= ~-target_switches
[j
].value
;
4421 target_flags
|= target_switches
[j
].value
;
4422 valid_target_option
= 1;
4425 #ifdef TARGET_OPTIONS
4426 if (!valid_target_option
)
4427 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4429 int len
= strlen (target_options
[j
].prefix
);
4430 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4432 *target_options
[j
].variable
= name
+ len
;
4433 valid_target_option
= 1;
4438 if (!valid_target_option
)
4439 error ("Invalid option `%s'", name
);
4442 /* Print version information to FILE.
4443 Each line begins with INDENT (for the case where FILE is the
4444 assembler output file). */
4447 print_version (file
, indent
)
4452 #define __VERSION__ "[?]"
4456 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4458 "%s%s%s version %s (%s) compiled by CC.\n"
4460 , indent
, *indent
!= 0 ? " " : "",
4461 lang_hooks
.name
, version_string
, TARGET_NAME
,
4462 indent
, __VERSION__
);
4465 /* Print an option value and return the adjusted position in the line.
4466 ??? We don't handle error returns from fprintf (disk full); presumably
4467 other code will catch a disk full though. */
4470 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4473 const char *indent
, *sep
, *term
, *type
, *name
;
4475 /* The ultrix fprintf returns 0 on success, so compute the result we want
4476 here since we need it for the following test. */
4477 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4482 fprintf (file
, "%s", term
);
4487 fprintf (file
, "%s", indent
);
4488 pos
= strlen (indent
);
4490 fprintf (file
, "%s%s%s", sep
, type
, name
);
4495 /* Print active target switches to FILE.
4496 POS is the current cursor position and MAX is the size of a "line".
4497 Each line begins with INDENT and ends with TERM.
4498 Each switch is separated from the next by SEP. */
4501 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4504 const char *indent
, *sep
, *term
;
4509 /* Print the options as passed. */
4511 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4512 _("options passed: "), "");
4514 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4518 if (strcmp (*p
, "-o") == 0)
4524 if (strcmp (*p
, "-quiet") == 0)
4526 if (strcmp (*p
, "-version") == 0)
4531 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4534 fprintf (file
, "%s", term
);
4536 /* Print the -f and -m options that have been enabled.
4537 We don't handle language specific options but printing argv
4540 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4541 _("options enabled: "), "");
4543 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4544 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4545 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4546 "-f", f_options
[j
].string
);
4548 /* Print target specific options. */
4550 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4551 if (target_switches
[j
].name
[0] != '\0'
4552 && target_switches
[j
].value
> 0
4553 && ((target_switches
[j
].value
& target_flags
)
4554 == target_switches
[j
].value
))
4556 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4557 "-m", target_switches
[j
].name
);
4560 #ifdef TARGET_OPTIONS
4561 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4562 if (*target_options
[j
].variable
!= NULL
)
4565 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4566 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4567 prefix
, *target_options
[j
].variable
);
4571 fprintf (file
, "%s", term
);
4574 /* Open assembly code output file. Do this even if -fsyntax-only is
4575 on, because then the driver will have provided the name of a
4576 temporary file or bit bucket for us. NAME is the file specified on
4577 the command line, possibly NULL. */
4579 init_asm_output (name
)
4582 if (name
== NULL
&& asm_file_name
== 0)
4583 asm_out_file
= stdout
;
4586 if (asm_file_name
== 0)
4588 int len
= strlen (dump_base_name
);
4589 char *dumpname
= (char *) xmalloc (len
+ 6);
4590 memcpy (dumpname
, dump_base_name
, len
+ 1);
4591 strip_off_ending (dumpname
, len
);
4592 strcat (dumpname
, ".s");
4593 asm_file_name
= dumpname
;
4595 if (!strcmp (asm_file_name
, "-"))
4596 asm_out_file
= stdout
;
4598 asm_out_file
= fopen (asm_file_name
, "w");
4599 if (asm_out_file
== 0)
4600 fatal_io_error ("can't open %s for writing", asm_file_name
);
4603 #ifdef IO_BUFFER_SIZE
4604 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4605 _IOFBF
, IO_BUFFER_SIZE
);
4608 if (!flag_syntax_only
)
4610 #ifdef ASM_FILE_START
4611 ASM_FILE_START (asm_out_file
);
4614 #ifdef ASM_COMMENT_START
4615 if (flag_verbose_asm
)
4617 /* Print the list of options in effect. */
4618 print_version (asm_out_file
, ASM_COMMENT_START
);
4619 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4620 ASM_COMMENT_START
, " ", "\n");
4621 /* Add a blank line here so it appears in assembler output but not
4623 fprintf (asm_out_file
, "\n");
4629 /* Initialization of the front end environment, before command line
4630 options are parsed. Signal handlers, internationalization etc.
4631 ARGV0 is main's argv[0]. */
4633 general_init (argv0
)
4638 p
= argv0
+ strlen (argv0
);
4639 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4643 xmalloc_set_program_name (progname
);
4645 gcc_init_libintl ();
4647 /* Install handler for SIGFPE, which may be received while we do
4648 compile-time floating point arithmetic. */
4649 signal (SIGFPE
, float_signal
);
4651 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4653 signal (SIGSEGV
, crash_signal
);
4656 signal (SIGILL
, crash_signal
);
4659 signal (SIGBUS
, crash_signal
);
4662 signal (SIGABRT
, crash_signal
);
4664 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4665 signal (SIGIOT
, crash_signal
);
4668 /* Initialize the diagnostics reporting machinery, so option parsing
4669 can give warnings and errors. */
4670 diagnostic_initialize (global_dc
);
4673 /* Parse command line options and set default flag values, called
4674 after language-independent option-independent intialization. Do
4675 minimal options processing. Outputting diagnostics is OK, but GC
4676 and identifier hashtables etc. are not initialized yet. */
4678 parse_options_and_default_flags (argc
, argv
)
4684 /* Save in case md file wants to emit args as a comment. */
4688 /* Initialize register usage now so switches may override. */
4691 /* Register the language-independent parameters. */
4692 add_params (lang_independent_params
, LAST_PARAM
);
4694 /* Perform language-specific options initialization. */
4695 (*lang_hooks
.init_options
) ();
4697 /* Scan to see what optimization level has been specified. That will
4698 determine the default value of many flags. */
4699 for (i
= 1; i
< argc
; i
++)
4701 if (!strcmp (argv
[i
], "-O"))
4706 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4708 /* Handle -Os, -O2, -O3, -O69, ... */
4709 char *p
= &argv
[i
][2];
4711 if ((p
[0] == 's') && (p
[1] == 0))
4715 /* Optimizing for size forces optimize to be 2. */
4720 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4721 if (optimize_val
!= -1)
4723 optimize
= optimize_val
;
4732 flag_merge_constants
= 0;
4738 flag_thread_jumps
= 1;
4740 flag_delayed_branch
= 1;
4742 #ifdef CAN_DEBUG_WITHOUT_FP
4743 flag_omit_frame_pointer
= 1;
4745 flag_guess_branch_prob
= 1;
4750 flag_optimize_sibling_calls
= 1;
4751 flag_cse_follow_jumps
= 1;
4752 flag_cse_skip_blocks
= 1;
4754 flag_expensive_optimizations
= 1;
4755 flag_strength_reduce
= 1;
4756 flag_rerun_cse_after_loop
= 1;
4757 flag_rerun_loop_opt
= 1;
4758 flag_caller_saves
= 1;
4761 #ifdef INSN_SCHEDULING
4762 flag_schedule_insns
= 1;
4763 flag_schedule_insns_after_reload
= 1;
4766 flag_strict_aliasing
= 1;
4767 flag_delete_null_pointer_checks
= 1;
4768 flag_reorder_blocks
= 1;
4773 flag_inline_functions
= 1;
4774 flag_rename_registers
= 1;
4777 if (optimize
< 2 || optimize_size
)
4782 align_functions
= 1;
4785 /* Initialize whether `char' is signed. */
4786 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4787 #ifdef DEFAULT_SHORT_ENUMS
4788 /* Initialize how much space enums occupy, by default. */
4789 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4792 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4795 set_target_switch ("");
4797 /* Unwind tables are always present in an ABI-conformant IA-64
4798 object file, so the default should be ON. */
4799 #ifdef IA64_UNWIND_INFO
4800 flag_unwind_tables
= IA64_UNWIND_INFO
;
4803 #ifdef OPTIMIZATION_OPTIONS
4804 /* Allow default optimizations to be specified on a per-machine basis. */
4805 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4808 /* Perform normal command line switch decoding. */
4809 for (i
= 1; i
< argc
;)
4812 int indep_processed
;
4814 /* Give the language a chance to decode the option for itself. */
4815 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4817 if (lang_processed
>= 0)
4818 /* Now see if the option also has a language independent meaning.
4819 Some options are both language specific and language independent,
4821 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4824 lang_processed
= -lang_processed
;
4825 indep_processed
= 0;
4828 if (lang_processed
|| indep_processed
)
4829 i
+= MAX (lang_processed
, indep_processed
);
4832 const char *option
= NULL
;
4833 const char *lang
= NULL
;
4836 /* It is possible that the command line switch is not valid for the
4837 current language, but it is valid for another language. In order
4838 to be compatible with previous versions of the compiler (which
4839 did not issue an error message in this case) we check for this
4840 possibility here. If we do find a match, then if extra_warnings
4841 is set we generate a warning message, otherwise we will just
4842 ignore the option. */
4843 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4845 option
= documented_lang_options
[j
].option
;
4848 lang
= documented_lang_options
[j
].description
;
4849 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4853 if (j
!= ARRAY_SIZE (documented_lang_options
))
4857 warning ("Ignoring command line option '%s'", argv
[i
]);
4860 ("(It is valid for %s but not the selected language)",
4864 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4865 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4867 error ("Unrecognized option `%s'", argv
[i
]);
4873 /* All command line options have been processed. */
4874 (*lang_hooks
.post_options
) ();
4877 /* Process the options that have been parsed. */
4881 /* Checker uses the frame pointer. */
4882 if (flag_check_memory_usage
)
4883 flag_omit_frame_pointer
= 0;
4887 /* Inlining does not work if not optimizing,
4888 so force it not to be done. */
4892 /* The c_decode_option function and decode_option hook set
4893 this to `2' if -Wall is used, so we can avoid giving out
4894 lots of errors for people who don't realize what -Wall does. */
4895 if (warn_uninitialized
== 1)
4896 warning ("-Wuninitialized is not supported without -O");
4899 /* We do not currently support sibling-call optimization in the
4900 presence of exceptions. See PR2975 for a test-case that will
4901 fail if we try to combine both of these features. */
4902 if (flag_exceptions
)
4903 flag_optimize_sibling_calls
= 0;
4905 #ifdef OVERRIDE_OPTIONS
4906 /* Some machines may reject certain combinations of options. */
4910 /* Set up the align_*_log variables, defaulting them to 1 if they
4911 were still unset. */
4912 if (align_loops
<= 0) align_loops
= 1;
4913 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4914 align_loops_max_skip
= align_loops
- 1;
4915 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4916 if (align_jumps
<= 0) align_jumps
= 1;
4917 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4918 align_jumps_max_skip
= align_jumps
- 1;
4919 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4920 if (align_labels
<= 0) align_labels
= 1;
4921 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4922 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4923 align_labels_max_skip
= align_labels
- 1;
4924 if (align_functions
<= 0) align_functions
= 1;
4925 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4927 if (profile_block_flag
== 3)
4929 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4930 profile_block_flag
= 2;
4933 /* Unrolling all loops implies that standard loop unrolling must also
4935 if (flag_unroll_all_loops
)
4936 flag_unroll_loops
= 1;
4937 /* Loop unrolling requires that strength_reduction be on also. Silently
4938 turn on strength reduction here if it isn't already on. Also, the loop
4939 unrolling code assumes that cse will be run after loop, so that must
4940 be turned on also. */
4941 if (flag_unroll_loops
)
4943 flag_strength_reduce
= 1;
4944 flag_rerun_cse_after_loop
= 1;
4947 if (flag_non_call_exceptions
)
4948 flag_asynchronous_unwind_tables
= 1;
4949 if (flag_asynchronous_unwind_tables
)
4950 flag_unwind_tables
= 1;
4952 /* Warn about options that are not supported on this machine. */
4953 #ifndef INSN_SCHEDULING
4954 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4955 warning ("instruction scheduling not supported on this target machine");
4958 if (flag_delayed_branch
)
4959 warning ("this target machine does not have delayed branches");
4962 /* Some operating systems do not allow profiling without a frame
4964 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4966 && flag_omit_frame_pointer
)
4968 error ("profiling does not work without a frame pointer");
4969 flag_omit_frame_pointer
= 0;
4972 user_label_prefix
= USER_LABEL_PREFIX
;
4973 if (flag_leading_underscore
!= -1)
4975 /* If the default prefix is more complicated than "" or "_",
4976 issue a warning and ignore this option. */
4977 if (user_label_prefix
[0] == 0 ||
4978 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4980 user_label_prefix
= flag_leading_underscore
? "_" : "";
4983 warning ("-f%sleading-underscore not supported on this target machine",
4984 flag_leading_underscore
? "" : "no-");
4987 /* If we are in verbose mode, write out the version and maybe all the
4988 option flags in use. */
4991 print_version (stderr
, "");
4993 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4999 if (flag_syntax_only
)
5001 write_symbols
= NO_DEBUG
;
5003 profile_block_flag
= 0;
5006 /* Now we know write_symbols, set up the debug hooks based on it.
5007 By default we do nothing for debug output. */
5008 #if defined(DBX_DEBUGGING_INFO)
5009 if (write_symbols
== DBX_DEBUG
)
5010 debug_hooks
= &dbx_debug_hooks
;
5012 #if defined(XCOFF_DEBUGGING_INFO)
5013 if (write_symbols
== XCOFF_DEBUG
)
5014 debug_hooks
= &xcoff_debug_hooks
;
5016 #ifdef SDB_DEBUGGING_INFO
5017 if (write_symbols
== SDB_DEBUG
)
5018 debug_hooks
= &sdb_debug_hooks
;
5020 #ifdef DWARF_DEBUGGING_INFO
5021 if (write_symbols
== DWARF_DEBUG
)
5022 debug_hooks
= &dwarf_debug_hooks
;
5024 #ifdef DWARF2_DEBUGGING_INFO
5025 if (write_symbols
== DWARF2_DEBUG
)
5026 debug_hooks
= &dwarf2_debug_hooks
;
5029 /* If auxiliary info generation is desired, open the output file.
5030 This goes in the same directory as the source file--unlike
5031 all the other output files. */
5032 if (flag_gen_aux_info
)
5034 aux_info_file
= fopen (aux_info_file_name
, "w");
5035 if (aux_info_file
== 0)
5036 fatal_io_error ("can't open %s", aux_info_file_name
);
5039 if (! targetm
.have_named_sections
)
5041 if (flag_function_sections
)
5043 warning ("-ffunction-sections not supported for this target.");
5044 flag_function_sections
= 0;
5046 if (flag_data_sections
)
5048 warning ("-fdata-sections not supported for this target.");
5049 flag_data_sections
= 0;
5053 if (flag_function_sections
5054 && (profile_flag
|| profile_block_flag
))
5056 warning ("-ffunction-sections disabled; it makes profiling impossible.");
5057 flag_function_sections
= 0;
5060 #ifndef OBJECT_FORMAT_ELF
5061 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5062 warning ("-ffunction-sections may affect debugging on some targets.");
5066 /* Language-independent initialization, before language-dependent
5069 lang_independent_init ()
5071 decl_printable_name
= decl_name
;
5072 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
5074 /* Set the language-dependent identifer size. */
5075 tree_code_length
[(int) IDENTIFIER_NODE
]
5076 = ((lang_hooks
.identifier_size
- sizeof (struct tree_common
))
5079 /* Initialize the garbage-collector, and string pools. FIXME: We
5080 should do this later, in independent_init () when we know we
5081 actually want to compile something, but cpplib currently wants to
5082 use the hash table immediately in cpp_create_reader. */
5084 ggc_add_rtx_root (&stack_limit_rtx
, 1);
5085 ggc_add_tree_root (¤t_function_decl
, 1);
5086 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
5091 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5092 || debug_info_level
== DINFO_LEVEL_VERBOSE
5093 || flag_test_coverage
5094 || warn_notreached
);
5100 init_function_once ();
5101 init_stor_layout_once ();
5102 init_varasm_once ();
5103 init_EXPR_INSN_LIST_cache ();
5105 /* The following initialization functions need to generate rtl, so
5106 provide a dummy function context for them. */
5107 init_dummy_function_start ();
5110 if (flag_caller_saves
)
5111 init_caller_save ();
5112 expand_dummy_function_end ();
5115 /* Language-dependent initialization. */
5117 lang_dependent_init (name
)
5120 if (dump_base_name
== 0)
5121 dump_base_name
= name
? name
: "gccdump";
5123 /* Front-end initialization. This hook can assume that GC,
5124 identifier hashes etc. are set up, but debug initialization is
5125 not done yet. This routine must return the original filename
5126 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5127 name
= (*lang_hooks
.init
) (name
);
5130 name
= ggc_strdup (name
);
5132 main_input_filename
= input_filename
= name
;
5133 init_asm_output (name
);
5135 /* These create various _DECL nodes, so need to be called after the
5136 front end is initialized. */
5140 /* Put an entry on the input file stack for the main input file. */
5141 push_srcloc (input_filename
, 0);
5143 /* If dbx symbol table desired, initialize writing it and output the
5144 predefined types. */
5145 timevar_push (TV_SYMOUT
);
5147 #ifdef DWARF2_UNWIND_INFO
5148 if (dwarf2out_do_frame ())
5149 dwarf2out_frame_init ();
5152 /* Now we have the correct original filename, we can initialize
5154 (*debug_hooks
->init
) (name
);
5156 timevar_pop (TV_SYMOUT
);
5159 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5160 Decode command args, then call compile_file.
5161 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5162 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5164 It is not safe to call this function more than once. */
5167 toplev_main (argc
, argv
)
5171 /* Initialization of GCC's environment, and diagnostics. */
5172 general_init (argv
[0]);
5174 /* Parse the options and do minimal processing; basically just
5175 enough to default flags appropriately. */
5176 parse_options_and_default_flags (argc
, argv
);
5178 /* Exit early if we can (e.g. -help). */
5179 if (exit_after_options
)
5180 return (SUCCESS_EXIT_CODE
);
5182 /* Start timing total execution time. */
5184 /* The bulk of command line switch processing. */
5187 /* We cannot start timing until after options are processed since that
5188 says if we run timers or not. */
5190 timevar_start (TV_TOTAL
);
5192 /* Language-independent initialization. Also sets up GC, identifier
5194 lang_independent_init ();
5196 /* Language-dependent initialization. */
5197 lang_dependent_init (filename
);
5201 /* Stop timing and print the times. */
5202 timevar_stop (TV_TOTAL
);
5203 timevar_print (stderr
);
5205 if (errorcount
|| sorrycount
)
5206 return (FATAL_EXIT_CODE
);
5208 return (SUCCESS_EXIT_CODE
);