1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 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. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
73 #include "langhooks.h"
74 #include "cfglayout.h"
76 #include "hosthooks.h"
80 #include "value-prof.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output
;
103 extern tree last_assemble_variable_decl
;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN
;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree
);
127 static void rest_of_handle_cse (tree
, rtx
);
128 static void rest_of_handle_cse2 (tree
, rtx
);
129 static void rest_of_handle_gcse (tree
, rtx
);
130 static void rest_of_handle_life (tree
, rtx
);
131 static void rest_of_handle_loop_optimize (tree
, rtx
);
132 static void rest_of_handle_loop2 (tree
, rtx
);
133 static void rest_of_handle_jump_bypass (tree
, rtx
);
134 static void rest_of_handle_sibling_calls (rtx
);
135 static void rest_of_handle_null_pointer (tree
, rtx
);
136 static void rest_of_handle_addressof (tree
, rtx
);
137 static void rest_of_handle_cfg (tree
, rtx
);
138 static void rest_of_handle_branch_prob (tree
, rtx
);
139 static void rest_of_handle_value_profile_transformations (tree
, rtx
);
140 static void rest_of_handle_if_conversion (tree
, rtx
);
141 static void rest_of_handle_if_after_combine (tree
, rtx
);
142 static void rest_of_handle_tracer (tree
, rtx
);
143 static void rest_of_handle_combine (tree
, rtx
);
144 static void rest_of_handle_regmove (tree
, rtx
);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree
, rtx
);
147 static void rest_of_handle_sched2 (tree
, rtx
);
149 static bool rest_of_handle_new_regalloc (tree
, rtx
);
150 static bool rest_of_handle_old_regalloc (tree
, rtx
);
151 static void rest_of_handle_regrename (tree
, rtx
);
152 static void rest_of_handle_reorder_blocks (tree
, rtx
);
154 static void rest_of_handle_stack_regs (tree
, rtx
);
156 static void rest_of_handle_machine_reorg (tree
, rtx
);
158 static void rest_of_handle_delay_slots (tree
, rtx
);
160 static void rest_of_handle_final (tree
, rtx
);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug
;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend
;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname
;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv
;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename
;
184 /* Current position in real source file. */
186 location_t input_location
;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack
*input_file_stack
;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick
;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name
;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name
;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags
;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit
;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks
*debug_hooks
;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension
;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch
;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p
;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
282 DFI_branch_target_load
,
290 /* Describes all the dump files. Should be kept in order of the
291 pass and in sync with dump_file_index above.
293 Remaining -d letters:
299 static struct dump_file_info dump_file
[DFI_MAX
] =
301 { "cgraph", 'U', 0, 0, 0 },
302 { "rtl", 'r', 0, 0, 0 },
303 { "sibling", 'i', 0, 0, 0 },
304 { "eh", 'h', 0, 0, 0 },
305 { "jump", 'j', 0, 0, 0 },
306 { "null", 'u', 0, 0, 0 },
307 { "cse", 's', 0, 0, 0 },
308 { "addressof", 'F', 0, 0, 0 },
309 { "gcse", 'G', 1, 0, 0 },
310 { "loop", 'L', 1, 0, 0 },
311 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "cfg", 'f', 1, 0, 0 },
313 { "bp", 'b', 1, 0, 0 },
314 { "vpt", 'V', 1, 0, 0 },
315 { "ce1", 'C', 1, 0, 0 },
316 { "tracer", 'T', 1, 0, 0 },
317 { "loop2", 'L', 1, 0, 0 },
318 { "web", 'Z', 0, 0, 0 },
319 { "cse2", 't', 1, 0, 0 },
320 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
321 { "combine", 'c', 1, 0, 0 },
322 { "ce2", 'C', 1, 0, 0 },
323 { "regmove", 'N', 1, 0, 0 },
324 { "sched", 'S', 1, 0, 0 },
325 { "lreg", 'l', 1, 0, 0 },
326 { "greg", 'g', 1, 0, 0 },
327 { "postreload", 'o', 1, 0, 0 },
328 { "flow2", 'w', 1, 0, 0 },
329 { "peephole2", 'z', 1, 0, 0 },
330 { "rnreg", 'n', 1, 0, 0 },
331 { "ce3", 'E', 1, 0, 0 },
332 { "bbro", 'B', 1, 0, 0 },
333 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
334 { "sched2", 'R', 1, 0, 0 },
335 { "stack", 'k', 1, 0, 0 },
336 { "mach", 'M', 1, 0, 0 },
337 { "dbr", 'd', 0, 0, 0 },
340 static int open_dump_file (enum dump_file_index
, tree
);
341 static void close_dump_file (enum dump_file_index
,
342 void (*) (FILE *, rtx
), rtx
);
344 /* Other flags saying which kinds of debugging dump have been requested. */
346 int rtl_dump_and_exit
;
347 int flag_print_asm_name
;
348 enum graph_dump_types graph_dump_format
;
350 /* Name for output file of assembly code, specified with -o. */
352 const char *asm_file_name
;
354 /* Nonzero means do optimizations. -O.
355 Particular numeric values stand for particular amounts of optimization;
356 thus, -O2 stores 2 here. However, the optimizations beyond the basic
357 ones are not controlled directly by this variable. Instead, they are
358 controlled by individual `flag_...' variables that are defaulted
359 based on this variable. */
363 /* Nonzero means optimize for size. -Os.
364 The only valid values are zero and nonzero. When optimize_size is
365 nonzero, optimize defaults to 2, but certain individual code
366 bloating optimizations are disabled. */
368 int optimize_size
= 0;
370 /* The FUNCTION_DECL for the function currently being compiled,
371 or 0 if between functions. */
372 tree current_function_decl
;
374 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
376 tree current_function_func_begin_label
;
378 /* Nonzero if doing dwarf2 duplicate elimination. */
380 int flag_eliminate_dwarf2_dups
= 0;
382 /* Nonzero if doing unused type elimination. */
384 int flag_eliminate_unused_debug_types
= 1;
386 /* Nonzero means emit debugging information only for symbols which are used. */
387 int flag_debug_only_used_symbols
= 0;
389 /* Nonzero if generating code to do profiling. */
391 int profile_flag
= 0;
393 /* Nonzero if generating code to profile program flow graph arcs. */
395 int profile_arc_flag
= 0;
397 /* Nonzero if value histograms should be measured. */
399 int flag_profile_values
= 0;
401 /* Nonzero if value histograms should be used to optimize code. */
402 int flag_value_profile_transformations
= 0;
404 /* Nonzero if generating info for gcov to calculate line test coverage. */
406 int flag_test_coverage
= 0;
408 /* Nonzero indicates that branch taken probabilities should be calculated. */
410 int flag_branch_probabilities
= 0;
412 /* Nonzero if basic blocks should be reordered. */
414 int flag_reorder_blocks
= 0;
416 /* Nonzero if functions should be reordered. */
418 int flag_reorder_functions
= 0;
420 /* Nonzero if registers should be renamed. */
422 int flag_rename_registers
= 0;
423 int flag_cprop_registers
= 0;
425 /* Nonzero for -pedantic switch: warn about anything
426 that standard spec forbids. */
430 /* Temporarily suppress certain warnings.
431 This is set while reading code from a system header file. */
433 int in_system_header
= 0;
435 /* Don't print functions as they are compiled. -quiet. */
439 /* Print times taken by the various passes. -ftime-report. */
443 /* Print memory still in use at end of compilation (which may have little
444 to do with peak memory consumption). -fmem-report. */
448 /* Nonzero means to collect statistics which might be expensive
449 and to print them when we are done. */
450 int flag_detailed_statistics
= 0;
452 /* A random sequence of characters, unless overridden by user. */
453 const char *flag_random_seed
;
455 /* A local time stamp derived from the time of compilation. It will be
456 zero if the system cannot provide a time. It will be -1u, if the
457 user has specified a particular random seed. */
462 /* Nonzero means `char' should be signed. */
464 int flag_signed_char
;
466 /* Nonzero means give an enum type only as many bytes as it needs. */
468 int flag_short_enums
;
470 /* Nonzero for -fcaller-saves: allocate values in regs that need to
471 be saved across function calls, if that produces overall better code.
472 Optional now, so people can test it. */
474 int flag_caller_saves
= 0;
476 /* Nonzero if structures and unions should be returned in memory.
478 This should only be defined if compatibility with another compiler or
479 with an ABI is needed, because it results in slower code. */
481 #ifndef DEFAULT_PCC_STRUCT_RETURN
482 #define DEFAULT_PCC_STRUCT_RETURN 1
485 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
487 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
489 /* Nonzero for -fforce-mem: load memory value into a register
490 before arithmetic on it. This makes better cse but slower compilation. */
492 int flag_force_mem
= 0;
494 /* Nonzero for -fforce-addr: load memory address into a register before
495 reference to memory. This makes better cse but slower compilation. */
497 int flag_force_addr
= 0;
499 /* Nonzero for -fdefer-pop: don't pop args after each function call;
500 instead save them up to pop many calls' args with one insns. */
502 int flag_defer_pop
= 0;
504 /* Nonzero for -ffloat-store: don't allocate floats and doubles
505 in extended-precision registers. */
507 int flag_float_store
= 0;
509 /* Nonzero for -fcse-follow-jumps:
510 have cse follow jumps to do a more extensive job. */
512 int flag_cse_follow_jumps
;
514 /* Nonzero for -fcse-skip-blocks:
515 have cse follow a branch around a block. */
516 int flag_cse_skip_blocks
;
518 /* Nonzero for -fexpensive-optimizations:
519 perform miscellaneous relatively-expensive optimizations. */
520 int flag_expensive_optimizations
;
522 /* Nonzero for -fthread-jumps:
523 have jump optimize output of loop. */
525 int flag_thread_jumps
;
527 /* Nonzero enables strength-reduction in loop.c. */
529 int flag_strength_reduce
= 0;
531 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
532 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
533 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
536 int flag_old_unroll_loops
;
538 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
539 This is generally not a win. */
541 int flag_old_unroll_all_loops
;
543 /* Enables unrolling of simple loops in loop-unroll.c. */
544 int flag_unroll_loops
;
546 /* Enables unrolling of all loops in loop-unroll.c. */
547 int flag_unroll_all_loops
;
549 /* Nonzero enables loop peeling. */
552 /* Nonzero enables loop unswitching. */
553 int flag_unswitch_loops
;
555 /* Nonzero enables prefetch optimizations for arrays in loops. */
557 int flag_prefetch_loop_arrays
;
559 /* Nonzero forces all invariant computations in loops to be moved
562 int flag_move_all_movables
= 0;
564 /* Nonzero forces all general induction variables in loops to be
567 int flag_reduce_all_givs
= 0;
569 /* Nonzero to perform full register move optimization passes. This is the
572 int flag_regmove
= 0;
574 /* Nonzero for -fwritable-strings:
575 store string constants in data segment and don't uniquize them. */
577 int flag_writable_strings
= 0;
579 /* Nonzero means don't put addresses of constant functions in registers.
580 Used for compiling the Unix kernel, where strange substitutions are
581 done on the assembly output. */
583 int flag_no_function_cse
= 0;
585 /* Nonzero for -fomit-frame-pointer:
586 don't make a frame pointer in simple functions that don't require one. */
588 int flag_omit_frame_pointer
= 0;
590 /* Nonzero means place each function into its own section on those platforms
591 which support arbitrary section names and unlimited numbers of sections. */
593 int flag_function_sections
= 0;
595 /* ... and similar for data. */
597 int flag_data_sections
= 0;
599 /* Nonzero to inhibit use of define_optimization peephole opts. */
601 int flag_no_peephole
= 0;
603 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
605 int flag_optimize_sibling_calls
= 0;
607 /* Nonzero means the front end generally wants `errno' maintained by math
608 operations, like built-in SQRT. */
610 int flag_errno_math
= 1;
612 /* Nonzero means that unsafe floating-point math optimizations are allowed
613 for the sake of speed. IEEE compliance is not guaranteed, and operations
614 are allowed to assume that their arguments and results are "normal"
615 (e.g., nonnegative for SQRT). */
617 int flag_unsafe_math_optimizations
= 0;
619 /* Nonzero means that no NaNs or +-Infs are expected. */
621 int flag_finite_math_only
= 0;
623 /* Zero means that floating-point math operations cannot generate a
624 (user-visible) trap. This is the case, for example, in nonstop
625 IEEE 754 arithmetic. Trapping conditions include division by zero,
626 overflow, underflow, invalid and inexact, but does not include
627 operations on signaling NaNs (see below). */
629 int flag_trapping_math
= 1;
631 /* Nonzero means disable transformations that assume default floating
632 point rounding behavior. */
634 int flag_rounding_math
= 0;
636 /* Nonzero means disable transformations observable by signaling NaNs.
637 This option implies that any operation on an IEEE signaling NaN can
638 generate a (user-visible) trap. */
640 int flag_signaling_nans
= 0;
642 /* 0 means straightforward implementation of complex divide acceptable.
643 1 means wide ranges of inputs must work for complex divide.
644 2 means C99-like requirements for complex divide (not yet implemented). */
646 int flag_complex_divide_method
= 0;
648 /* Nonzero means just do syntax checking; don't output anything. */
650 int flag_syntax_only
= 0;
652 /* Nonzero means performs web construction pass. */
656 /* Nonzero means perform loop optimizer. */
658 int flag_loop_optimize
;
660 /* Nonzero means perform crossjumping. */
662 int flag_crossjumping
;
664 /* Nonzero means perform if conversion. */
666 int flag_if_conversion
;
668 /* Nonzero means perform if conversion after reload. */
670 int flag_if_conversion2
;
672 /* Nonzero means to use global dataflow analysis to eliminate
673 useless null pointer tests. */
675 int flag_delete_null_pointer_checks
;
677 /* Nonzero means perform global CSE. */
681 /* Nonzero means to do the enhanced load motion during gcse, which trys
682 to hoist loads by not killing them when a store to the same location
685 int flag_gcse_lm
= 1;
687 /* Nonzero means to perform store motion after gcse, which will try to
688 move stores closer to the exit block. Its not very effective without
691 int flag_gcse_sm
= 1;
693 /* Nonzero if we want to perfrom redundant load after store elimination
696 int flag_gcse_las
= 1;
698 /* Perform target register optimization before prologue / epilogue
701 int flag_branch_target_load_optimize
= 0;
703 /* Perform target register optimization after prologue / epilogue
704 threading and jump2. */
706 int flag_branch_target_load_optimize2
= 0;
708 /* Nonzero means to rerun cse after loop optimization. This increases
709 compilation time about 20% and picks up a few more common expressions. */
711 int flag_rerun_cse_after_loop
;
713 /* Nonzero means to run loop optimizations twice. */
715 int flag_rerun_loop_opt
;
717 /* Nonzero for -finline-functions: ok to inline functions that look like
718 good inline candidates. */
720 int flag_inline_functions
;
722 /* Nonzero for -fkeep-inline-functions: even if we make a function
723 go inline everywhere, keep its definition around for debugging
726 int flag_keep_inline_functions
;
728 /* Nonzero means that functions will not be inlined. */
730 int flag_no_inline
= 2;
732 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
733 not just because the tree inliner turned us off. */
735 int flag_really_no_inline
= 2;
737 /* Nonzero means that we should emit static const variables
738 regardless of whether or not optimization is turned on. */
740 int flag_keep_static_consts
= 1;
742 /* Nonzero means we should be saving declaration info into a .X file. */
744 int flag_gen_aux_info
= 0;
746 /* Specified name of aux-info file. */
748 const char *aux_info_file_name
;
750 /* Nonzero means make the text shared if supported. */
752 int flag_shared_data
;
754 /* Nonzero means schedule into delayed branch slots if supported. */
756 int flag_delayed_branch
;
758 /* Nonzero if we are compiling pure (sharable) code.
759 Value is 1 if we are doing "small" pic; value is 2 if we're doing
764 /* Nonzero if we are compiling position independent code for executable.
765 The value is 1 if we are doing "small" pic; value is 2 if we're doing
770 /* Nonzero if we are compiling code for a shared library, zero for
775 /* Set to the default thread-local storage (tls) model to use. */
777 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
779 /* Nonzero means generate extra code for exception handling and enable
780 exception handling. */
784 /* Nonzero means generate frame unwind info table when supported. */
786 int flag_unwind_tables
= 0;
788 /* Nonzero means generate frame unwind info table exact at each insn
791 int flag_asynchronous_unwind_tables
= 0;
793 /* Nonzero means don't place uninitialized global data in common storage
798 /* Nonzero means change certain warnings into errors.
799 Usually these are warnings about failure to conform to some standard. */
801 int flag_pedantic_errors
= 0;
803 /* flag_schedule_insns means schedule insns within basic blocks (before
805 flag_schedule_insns_after_reload means schedule insns after
808 int flag_schedule_insns
= 0;
809 int flag_schedule_insns_after_reload
= 0;
811 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
812 int flag_sched2_use_superblocks
= 0;
814 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
816 int flag_sched2_use_traces
= 0;
818 /* The following flags have effect only for scheduling before register
821 flag_schedule_interblock means schedule insns across basic blocks.
822 flag_schedule_speculative means allow speculative motion of non-load insns.
823 flag_schedule_speculative_load means allow speculative motion of some
825 flag_schedule_speculative_load_dangerous allows speculative motion of more
828 int flag_schedule_interblock
= 1;
829 int flag_schedule_speculative
= 1;
830 int flag_schedule_speculative_load
= 0;
831 int flag_schedule_speculative_load_dangerous
= 0;
833 /* The following flags have an effect during scheduling after register
836 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
837 of stalled insns into the ready list.
839 flag_sched_stalled_insns_dep controls how many insn groups will be examined
840 for a dependency on a stalled insn that is candidate for premature removal
841 from the queue of stalled insns into the ready list (has an effect only if
842 the flag 'sched_stalled_insns' is set). */
844 int flag_sched_stalled_insns
= 0;
845 int flag_sched_stalled_insns_dep
= 1;
847 int flag_single_precision_constant
;
849 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
850 by a cheaper branch on a count register. */
851 int flag_branch_on_count_reg
= 1;
853 /* -finhibit-size-directive inhibits output of .size for ELF.
854 This is used only for compiling crtstuff.c,
855 and it may be extended to other effects
856 needed for crtstuff.c on other systems. */
857 int flag_inhibit_size_directive
= 0;
859 /* -fverbose-asm causes extra commentary information to be produced in
860 the generated assembly code (to make it more readable). This option
861 is generally only of use to those who actually need to read the
862 generated assembly code (perhaps while debugging the compiler itself).
863 -fno-verbose-asm, the default, causes the extra information
864 to be omitted and is useful when comparing two assembler files. */
866 int flag_verbose_asm
= 0;
868 /* -dA causes debug commentary information to be produced in
869 the generated assembly code (to make it more readable). This option
870 is generally only of use to those who actually need to read the
871 generated assembly code (perhaps while debugging the compiler itself).
872 Currently, this switch is only used by dwarfout.c; however, it is intended
873 to be a catchall for printing debug information in the assembler file. */
875 int flag_debug_asm
= 0;
877 /* -dP causes the rtl to be emitted as a comment in assembly. */
879 int flag_dump_rtl_in_asm
= 0;
881 /* Nonzero means put zero initialized data in the bss section. */
882 int flag_zero_initialized_in_bss
= 1;
884 /* Tag all structures with __attribute__(packed). */
885 int flag_pack_struct
= 0;
887 /* Emit code to check for stack overflow; also may cause large objects
888 to be allocated dynamically. */
889 int flag_stack_check
;
891 /* When non-NULL, indicates that whenever space is allocated on the
892 stack, the resulting stack pointer must not pass this
893 address---that is, for stacks that grow downward, the stack pointer
894 must always be greater than or equal to this address; for stacks
895 that grow upward, the stack pointer must be less than this address.
896 At present, the rtx may be either a REG or a SYMBOL_REF, although
897 the support provided depends on the backend. */
900 /* 0 if pointer arguments may alias each other. True in C.
901 1 if pointer arguments may not alias each other but may alias
903 2 if pointer arguments may not alias each other and may not
904 alias global variables. True in Fortran.
905 This defaults to 0 for C. */
906 int flag_argument_noalias
= 0;
908 /* Nonzero if we should do (language-dependent) alias analysis.
909 Typically, this analysis will assume that expressions of certain
910 types do not alias expressions of certain other types. Only used
911 if alias analysis (in general) is enabled. */
912 int flag_strict_aliasing
= 0;
914 /* Instrument functions with calls at entry and exit, for profiling. */
915 int flag_instrument_function_entry_exit
= 0;
917 /* Nonzero means ignore `#ident' directives. 0 means handle them.
918 On SVR4 targets, it also controls whether or not to emit a
919 string identifying the compiler. */
921 int flag_no_ident
= 0;
923 /* This will perform a peephole pass before sched2. */
924 int flag_peephole2
= 0;
926 /* This will try to guess branch probabilities. */
927 int flag_guess_branch_prob
= 0;
929 /* -fcheck-bounds causes gcc to generate array bounds checks.
930 For C, C++, ObjC: defaults to off.
931 For Java: defaults to on.
932 For Fortran: defaults to off. */
933 int flag_bounds_check
= 0;
935 /* This will attempt to merge constant section constants, if 1 only
936 string constants and constants from constant pool, if 2 also constant
938 int flag_merge_constants
= 1;
940 /* If one, renumber instruction UIDs to reduce the number of
941 unused UIDs if there are a lot of instructions. If greater than
942 one, unconditionally renumber instruction UIDs. */
943 int flag_renumber_insns
= 1;
945 /* If nonzero, use the graph coloring register allocator. */
946 int flag_new_regalloc
= 0;
948 /* Nonzero if we perform superblock formation. */
952 /* Nonzero if we perform whole unit at a time compilation. */
954 int flag_unit_at_a_time
= 0;
956 /* Values of the -falign-* flags: how much to align labels in code.
957 0 means `use default', 1 means `don't align'.
958 For each variable, there is an _log variant which is the power
959 of two not less than the variable, for .align output. */
963 int align_loops_max_skip
;
966 int align_jumps_max_skip
;
968 int align_labels_log
;
969 int align_labels_max_skip
;
971 int align_functions_log
;
973 /* Like align_functions_log above, but used by front-ends to force the
974 minimum function alignment. Zero means no alignment is forced. */
975 int force_align_functions_log
;
979 const char *const string
;
983 lang_independent_options
;
985 /* Nonzero if signed arithmetic overflow should trap. */
988 /* Nonzero if signed arithmetic overflow should wrap around. */
991 /* Nonzero if subexpressions must be evaluated from left-to-right. */
992 int flag_evaluation_order
= 0;
994 /* Add or remove a leading underscore from user symbols. */
995 int flag_leading_underscore
= -1;
997 /* The user symbol prefix after having resolved same. */
998 const char *user_label_prefix
;
1000 static const param_info lang_independent_params
[] = {
1001 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1002 { OPTION, DEFAULT, HELP },
1003 #include "params.def"
1008 /* Table of language-independent -f options.
1009 STRING is the option name. VARIABLE is the address of the variable.
1010 ON_VALUE is the value to store in VARIABLE
1011 if `-fSTRING' is seen as an option.
1012 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1014 static const lang_independent_options f_options
[] =
1016 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1 },
1017 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols
, 1 },
1018 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types
, 1 },
1019 {"float-store", &flag_float_store
, 1 },
1020 {"defer-pop", &flag_defer_pop
, 1 },
1021 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1 },
1022 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1 },
1023 {"tracer", &flag_tracer
, 1 },
1024 {"unit-at-a-time", &flag_unit_at_a_time
, 1 },
1025 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1 },
1026 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1 },
1027 {"expensive-optimizations", &flag_expensive_optimizations
, 1 },
1028 {"thread-jumps", &flag_thread_jumps
, 1 },
1029 {"strength-reduce", &flag_strength_reduce
, 1 },
1030 {"unroll-loops", &flag_unroll_loops
, 1 },
1031 {"unroll-all-loops", &flag_unroll_all_loops
, 1 },
1032 {"old-unroll-loops", &flag_old_unroll_loops
, 1 },
1033 {"old-unroll-all-loops", &flag_old_unroll_all_loops
, 1 },
1034 {"peel-loops", &flag_peel_loops
, 1 },
1035 {"unswitch-loops", &flag_unswitch_loops
, 1 },
1036 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1 },
1037 {"move-all-movables", &flag_move_all_movables
, 1 },
1038 {"reduce-all-givs", &flag_reduce_all_givs
, 1 },
1039 {"writable-strings", &flag_writable_strings
, 1 },
1040 {"peephole", &flag_no_peephole
, 0 },
1041 {"force-mem", &flag_force_mem
, 1 },
1042 {"force-addr", &flag_force_addr
, 1 },
1043 {"function-cse", &flag_no_function_cse
, 0 },
1044 {"inline-functions", &flag_inline_functions
, 1 },
1045 {"keep-inline-functions", &flag_keep_inline_functions
, 1 },
1046 {"inline", &flag_no_inline
, 0 },
1047 {"keep-static-consts", &flag_keep_static_consts
, 1 },
1048 {"syntax-only", &flag_syntax_only
, 1 },
1049 {"shared-data", &flag_shared_data
, 1 },
1050 {"caller-saves", &flag_caller_saves
, 1 },
1051 {"pcc-struct-return", &flag_pcc_struct_return
, 1 },
1052 {"reg-struct-return", &flag_pcc_struct_return
, 0 },
1053 {"delayed-branch", &flag_delayed_branch
, 1 },
1054 {"web", &flag_web
, 1},
1055 {"gcse", &flag_gcse
, 1 },
1056 {"gcse-lm", &flag_gcse_lm
, 1 },
1057 {"gcse-sm", &flag_gcse_sm
, 1 },
1058 {"gcse-las", &flag_gcse_las
, 1 },
1059 {"branch-target-load-optimize", &flag_branch_target_load_optimize
, 1 },
1060 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2
, 1 },
1061 {"loop-optimize", &flag_loop_optimize
, 1 },
1062 {"crossjumping", &flag_crossjumping
, 1 },
1063 {"if-conversion", &flag_if_conversion
, 1 },
1064 {"if-conversion2", &flag_if_conversion2
, 1 },
1065 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1 },
1066 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1 },
1067 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1 },
1068 {"schedule-insns", &flag_schedule_insns
, 1 },
1069 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1 },
1070 {"sched-interblock",&flag_schedule_interblock
, 1 },
1071 {"sched-spec",&flag_schedule_speculative
, 1 },
1072 {"sched-spec-load",&flag_schedule_speculative_load
, 1 },
1073 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1 },
1074 {"sched-stalled-insns", &flag_sched_stalled_insns
, 0 },
1075 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep
, 1 },
1076 {"sched2-use-superblocks", &flag_sched2_use_superblocks
, 1 },
1077 {"sched2-use-traces", &flag_sched2_use_traces
, 1 },
1078 {"branch-count-reg",&flag_branch_on_count_reg
, 1 },
1079 {"pic", &flag_pic
, 1 },
1080 {"PIC", &flag_pic
, 2 },
1081 {"pie", &flag_pie
, 1 },
1082 {"PIE", &flag_pie
, 2 },
1083 {"exceptions", &flag_exceptions
, 1 },
1084 {"unwind-tables", &flag_unwind_tables
, 1 },
1085 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1 },
1086 {"non-call-exceptions", &flag_non_call_exceptions
, 1 },
1087 {"profile-arcs", &profile_arc_flag
, 1 },
1088 {"profile-values", &flag_profile_values
, 1 },
1089 {"vpt", &flag_value_profile_transformations
, 1 },
1090 {"test-coverage", &flag_test_coverage
, 1 },
1091 {"branch-probabilities", &flag_branch_probabilities
, 1 },
1092 {"profile", &profile_flag
, 1 },
1093 {"reorder-blocks", &flag_reorder_blocks
, 1 },
1094 {"reorder-functions", &flag_reorder_functions
, 1 },
1095 {"rename-registers", &flag_rename_registers
, 1 },
1096 {"cprop-registers", &flag_cprop_registers
, 1 },
1097 {"common", &flag_no_common
, 0 },
1098 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1 },
1099 {"function-sections", &flag_function_sections
, 1 },
1100 {"data-sections", &flag_data_sections
, 1 },
1101 {"verbose-asm", &flag_verbose_asm
, 1 },
1102 {"regmove", &flag_regmove
, 1 },
1103 {"optimize-register-move", &flag_regmove
, 1 },
1104 {"pack-struct", &flag_pack_struct
, 1 },
1105 {"stack-check", &flag_stack_check
, 1 },
1106 {"argument-alias", &flag_argument_noalias
, 0 },
1107 {"argument-noalias", &flag_argument_noalias
, 1 },
1108 {"argument-noalias-global", &flag_argument_noalias
, 2 },
1109 {"strict-aliasing", &flag_strict_aliasing
, 1 },
1110 {"align-loops", &align_loops
, 0 },
1111 {"align-jumps", &align_jumps
, 0 },
1112 {"align-labels", &align_labels
, 0 },
1113 {"align-functions", &align_functions
, 0 },
1114 {"merge-constants", &flag_merge_constants
, 1 },
1115 {"merge-all-constants", &flag_merge_constants
, 2 },
1116 {"dump-unnumbered", &flag_dump_unnumbered
, 1 },
1117 {"instrument-functions", &flag_instrument_function_entry_exit
, 1 },
1118 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1 },
1119 {"leading-underscore", &flag_leading_underscore
, 1 },
1120 {"ident", &flag_no_ident
, 0 },
1121 { "peephole2", &flag_peephole2
, 1 },
1122 {"finite-math-only", &flag_finite_math_only
, 1 },
1123 { "guess-branch-probability", &flag_guess_branch_prob
, 1 },
1124 {"math-errno", &flag_errno_math
, 1 },
1125 {"trapping-math", &flag_trapping_math
, 1 },
1126 {"rounding-math", &flag_rounding_math
, 1 },
1127 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1 },
1128 {"signaling-nans", &flag_signaling_nans
, 1 },
1129 {"bounds-check", &flag_bounds_check
, 1 },
1130 {"single-precision-constant", &flag_single_precision_constant
, 1 },
1131 {"time-report", &time_report
, 1 },
1132 {"mem-report", &mem_report
, 1 },
1133 { "trapv", &flag_trapv
, 1 },
1134 { "wrapv", &flag_wrapv
, 1 },
1135 { "new-ra", &flag_new_regalloc
, 1 }
1138 /* Here is a table, controlled by the tm.h file, listing each -m switch
1139 and which bits in `target_switches' it should set or clear.
1140 If VALUE is positive, it is bits to set.
1141 If VALUE is negative, -VALUE is bits to clear.
1142 (The sign bit is not used so there is no confusion.) */
1146 const char *const name
;
1148 const char *const description
;
1150 target_switches
[] = TARGET_SWITCHES
;
1152 /* This table is similar, but allows the switch to have a value. */
1154 #ifdef TARGET_OPTIONS
1157 const char *const prefix
;
1158 const char **const variable
;
1159 const char *const description
;
1160 const char *const value
;
1162 target_options
[] = TARGET_OPTIONS
;
1165 /* Nonzero means warn about function definitions that default the return type
1166 or that use a null return and have a return-type other than void. */
1168 int warn_return_type
;
1170 /* Output files for assembler code (real compiler output)
1171 and debugging dumps. */
1174 FILE *aux_info_file
;
1175 FILE *rtl_dump_file
= NULL
;
1176 FILE *cgraph_dump_file
= NULL
;
1178 /* The current working directory of a translation. It's generally the
1179 directory from which compilation was initiated, but a preprocessed
1180 file may specify the original directory in which it was
1183 static const char *src_pwd
;
1185 /* Initialize src_pwd with the given string, and return true. If it
1186 was already initialized, return false. As a special case, it may
1187 be called with a NULL argument to test whether src_pwd has NOT been
1191 set_src_pwd (const char *pwd
)
1196 src_pwd
= xstrdup (pwd
);
1200 /* Return the directory from which the translation unit was initiated,
1201 in case set_src_pwd() was not called before to assign it a
1208 src_pwd
= getpwd ();
1213 /* Called when the start of a function definition is parsed,
1214 this function prints on stderr the name of the function. */
1216 announce_function (tree decl
)
1220 if (rtl_dump_and_exit
)
1221 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl
)));
1223 verbatim (" %s", (*lang_hooks
.decl_printable_name
) (decl
, 2));
1225 pp_needs_newline (global_dc
->printer
) = true;
1226 diagnostic_set_last_function (global_dc
);
1230 /* Set up a default flag_random_seed and local_tick, unless the user
1231 already specified one. */
1236 if (!flag_random_seed
)
1238 unsigned HOST_WIDE_INT value
;
1239 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
1241 /* Get some more or less random data. */
1242 #ifdef HAVE_GETTIMEOFDAY
1246 gettimeofday (&tv
, NULL
);
1247 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
1251 time_t now
= time (NULL
);
1253 if (now
!= (time_t)-1)
1254 local_tick
= (unsigned) now
;
1257 value
= local_tick
^ getpid ();
1259 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
1260 flag_random_seed
= random_seed
;
1262 else if (!local_tick
)
1267 /* Decode the string P as an integral parameter.
1268 If the string is indeed an integer return its numeric value else
1269 issue an Invalid Option error for the option PNAME and return DEFVAL.
1270 If PNAME is zero just return DEFVAL, do not call error. */
1273 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
1275 const char *endp
= p
;
1279 if (ISDIGIT (*endp
))
1288 error ("invalid option argument `%s'", pname
);
1295 /* Return the logarithm of X, base 2, considering X unsigned,
1296 if X is a power of 2. Otherwise, returns -1.
1298 This should be used via the `exact_log2' macro. */
1301 exact_log2_wide (unsigned HOST_WIDE_INT x
)
1304 /* Test for 0 or a power of 2. */
1305 if (x
== 0 || x
!= (x
& -x
))
1307 while ((x
>>= 1) != 0)
1312 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1313 If X is 0, return -1.
1315 This should be used via the floor_log2 macro. */
1318 floor_log2_wide (unsigned HOST_WIDE_INT x
)
1327 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1328 into ICE messages, which is much more user friendly. In case the
1329 error printer crashes, reset the signal to prevent infinite recursion. */
1332 crash_signal (int signo
)
1334 signal (signo
, SIG_DFL
);
1335 internal_error ("%s", strsignal (signo
));
1338 /* Arrange to dump core on error. (The regular error message is still
1339 printed first, except in the case of abort().) */
1342 setup_core_dumping (void)
1345 signal (SIGABRT
, SIG_DFL
);
1347 #if defined(HAVE_SETRLIMIT)
1350 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
1351 fatal_error ("getting core file size maximum limit: %m");
1352 rlim
.rlim_cur
= rlim
.rlim_max
;
1353 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
1354 fatal_error ("setting core file size limit to maximum: %m");
1357 diagnostic_abort_on_error (global_dc
);
1361 /* Strip off a legitimate source ending from the input string NAME of
1362 length LEN. Rather than having to know the names used by all of
1363 our front ends, we strip off an ending of a period followed by
1364 up to five characters. (Java uses ".class".) */
1367 strip_off_ending (char *name
, int len
)
1370 for (i
= 2; i
< 6 && len
> i
; i
++)
1372 if (name
[len
- i
] == '.')
1374 name
[len
- i
] = '\0';
1380 /* Output a quoted string. */
1383 output_quoted_string (FILE *asm_file
, const char *string
)
1385 #ifdef OUTPUT_QUOTED_STRING
1386 OUTPUT_QUOTED_STRING (asm_file
, string
);
1390 putc ('\"', asm_file
);
1391 while ((c
= *string
++) != 0)
1395 if (c
== '\"' || c
== '\\')
1396 putc ('\\', asm_file
);
1400 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1402 putc ('\"', asm_file
);
1406 /* Output a file name in the form wanted by System V. */
1409 output_file_directive (FILE *asm_file
, const char *input_name
)
1414 if (input_name
== NULL
)
1415 input_name
= "<stdin>";
1417 len
= strlen (input_name
);
1418 na
= input_name
+ len
;
1420 /* NA gets INPUT_NAME sans directory names. */
1421 while (na
> input_name
)
1423 if (IS_DIR_SEPARATOR (na
[-1]))
1428 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1429 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1431 fprintf (asm_file
, "\t.file\t");
1432 output_quoted_string (asm_file
, na
);
1433 fputc ('\n', asm_file
);
1437 /* Routine to open a dump file. Return true if the dump file is enabled. */
1440 open_dump_file (enum dump_file_index index
, tree decl
)
1443 const char *open_arg
;
1446 if (! dump_file
[index
].enabled
)
1449 timevar_push (TV_DUMP
);
1450 if (rtl_dump_file
!= NULL
)
1451 fclose (rtl_dump_file
);
1453 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1455 if (! dump_file
[index
].initialized
)
1457 /* If we've not initialized the files, do so now. */
1458 if (graph_dump_format
!= no_graph
1459 && dump_file
[index
].graph_dump_p
)
1461 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1462 clean_graph_dump_file (dump_base_name
, dump_name
);
1465 dump_file
[index
].initialized
= 1;
1471 dump_name
= concat (dump_base_name
, seq
,
1472 dump_file
[index
].extension
, NULL
);
1474 rtl_dump_file
= fopen (dump_name
, open_arg
);
1475 if (rtl_dump_file
== NULL
)
1476 fatal_error ("can't open %s: %m", dump_name
);
1481 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1482 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1483 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1485 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1486 ? " (unlikely executed)"
1489 timevar_pop (TV_DUMP
);
1493 /* Routine to close a dump file. */
1496 close_dump_file (enum dump_file_index index
,
1497 void (*func
) (FILE *, rtx
),
1500 if (! rtl_dump_file
)
1503 timevar_push (TV_DUMP
);
1505 && graph_dump_format
!= no_graph
1506 && dump_file
[index
].graph_dump_p
)
1511 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1512 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1513 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1518 func (rtl_dump_file
, insns
);
1520 fflush (rtl_dump_file
);
1521 fclose (rtl_dump_file
);
1523 rtl_dump_file
= NULL
;
1524 timevar_pop (TV_DUMP
);
1527 /* Do any final processing required for the declarations in VEC, of
1528 which there are LEN. We write out inline functions and variables
1529 that have been deferred until this point, but which are required.
1530 Returns nonzero if anything was put out. */
1533 wrapup_global_declarations (tree
*vec
, int len
)
1538 int output_something
= 0;
1540 for (i
= 0; i
< len
; i
++)
1544 /* We're not deferring this any longer. Assignment is
1545 conditional to avoid needlessly dirtying PCH pages. */
1546 if (DECL_DEFER_OUTPUT (decl
) != 0)
1547 DECL_DEFER_OUTPUT (decl
) = 0;
1549 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1550 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1553 /* Now emit any global variables or functions that we have been
1554 putting off. We need to loop in case one of the things emitted
1555 here references another one which comes earlier in the list. */
1559 for (i
= 0; i
< len
; i
++)
1563 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1566 /* Don't write out static consts, unless we still need them.
1568 We also keep static consts if not optimizing (for debugging),
1569 unless the user specified -fno-keep-static-consts.
1570 ??? They might be better written into the debug information.
1571 This is possible when using DWARF.
1573 A language processor that wants static constants to be always
1574 written out (even if it is not used) is responsible for
1575 calling rest_of_decl_compilation itself. E.g. the C front-end
1576 calls rest_of_decl_compilation from finish_decl.
1577 One motivation for this is that is conventional in some
1578 environments to write things like:
1579 static const char rcsid[] = "... version string ...";
1580 intending to force the string to be in the executable.
1582 A language processor that would prefer to have unneeded
1583 static constants "optimized away" would just defer writing
1584 them out until here. E.g. C++ does this, because static
1585 constants are often defined in header files.
1587 ??? A tempting alternative (for both C and C++) would be
1588 to force a constant to be written if and only if it is
1589 defined in a main file, as opposed to an include file. */
1591 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1595 if (flag_unit_at_a_time
1596 && cgraph_varpool_node (decl
)->finalized
)
1598 else if ((flag_unit_at_a_time
&& !cgraph_global_info_ready
)
1599 && (TREE_USED (decl
)
1600 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
1602 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1604 else if (DECL_COMDAT (decl
))
1606 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1607 && (optimize
|| !flag_keep_static_consts
1608 || DECL_ARTIFICIAL (decl
)))
1614 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1618 if (TREE_CODE (decl
) == FUNCTION_DECL
1619 && DECL_INITIAL (decl
) != 0
1620 && DECL_SAVED_INSNS (decl
) != 0
1621 && DECL_SAVED_INSNS (decl
)->saved_for_inline
1622 && (flag_keep_inline_functions
1623 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1624 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1627 output_inline_function (decl
);
1632 output_something
= 1;
1636 return output_something
;
1639 /* Issue appropriate warnings for the global declarations in VEC (of
1640 which there are LEN). Output debugging information for them. */
1643 check_global_declarations (tree
*vec
, int len
)
1648 for (i
= 0; i
< len
; i
++)
1652 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1653 && ! TREE_ASM_WRITTEN (decl
))
1654 /* Cancel the RTL for this decl so that, if debugging info
1655 output for global variables is still to come,
1656 this one will be omitted. */
1657 SET_DECL_RTL (decl
, NULL_RTX
);
1659 /* Warn about any function
1660 declared static but not defined.
1661 We don't warn about variables,
1662 because many programs have static variables
1663 that exist only to get some text into the object file. */
1664 if (TREE_CODE (decl
) == FUNCTION_DECL
1665 && (warn_unused_function
1666 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1667 && DECL_INITIAL (decl
) == 0
1668 && DECL_EXTERNAL (decl
)
1669 && ! DECL_ARTIFICIAL (decl
)
1670 && ! TREE_PUBLIC (decl
))
1672 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1673 pedwarn ("%J'%F' used but never defined", decl
, decl
);
1675 warning ("%J'%F' declared `static' but never defined", decl
, decl
);
1676 /* This symbol is effectively an "extern" declaration now. */
1677 TREE_PUBLIC (decl
) = 1;
1678 assemble_external (decl
);
1681 /* Warn about static fns or vars defined but not used. */
1682 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
1683 /* We don't warn about "static const" variables because the
1684 "rcs_id" idiom uses that construction. */
1685 || (warn_unused_variable
1686 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
1687 && ! DECL_IN_SYSTEM_HEADER (decl
)
1688 && ! TREE_USED (decl
)
1689 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1690 to handle multiple external decls in different scopes. */
1691 && ! TREE_USED (DECL_NAME (decl
))
1692 && ! DECL_EXTERNAL (decl
)
1693 && ! TREE_PUBLIC (decl
)
1694 /* A volatile variable might be used in some non-obvious way. */
1695 && ! TREE_THIS_VOLATILE (decl
)
1696 /* Global register variables must be declared to reserve them. */
1697 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
1698 /* Otherwise, ask the language. */
1699 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
1700 warning ("%J'%D' defined but not used", decl
, decl
);
1702 /* Avoid confusing the debug information machinery when there are
1704 if (errorcount
== 0 && sorrycount
== 0)
1706 timevar_push (TV_SYMOUT
);
1707 (*debug_hooks
->global_decl
) (decl
);
1708 timevar_pop (TV_SYMOUT
);
1713 /* Warn about a use of an identifier which was marked deprecated. */
1715 warn_deprecated_use (tree node
)
1717 if (node
== 0 || !warn_deprecated_decl
)
1721 warning ("`%s' is deprecated (declared at %s:%d)",
1722 IDENTIFIER_POINTER (DECL_NAME (node
)),
1723 DECL_SOURCE_FILE (node
), DECL_SOURCE_LINE (node
));
1724 else if (TYPE_P (node
))
1726 const char *what
= NULL
;
1727 tree decl
= TYPE_STUB_DECL (node
);
1729 if (TREE_CODE (TYPE_NAME (node
)) == IDENTIFIER_NODE
)
1730 what
= IDENTIFIER_POINTER (TYPE_NAME (node
));
1731 else if (TREE_CODE (TYPE_NAME (node
)) == TYPE_DECL
1732 && DECL_NAME (TYPE_NAME (node
)))
1733 what
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node
)));
1738 warning ("`%s' is deprecated (declared at %s:%d)", what
,
1739 DECL_SOURCE_FILE (decl
), DECL_SOURCE_LINE (decl
));
1741 warning ("`%s' is deprecated", what
);
1744 warning ("type is deprecated (declared at %s:%d)",
1745 DECL_SOURCE_FILE (decl
), DECL_SOURCE_LINE (decl
));
1747 warning ("type is deprecated");
1751 /* Save the current INPUT_LOCATION on the top entry in the
1752 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1753 INPUT_LOCATION accordingly. */
1756 push_srcloc (const char *file
, int line
)
1758 struct file_stack
*fs
;
1760 fs
= xmalloc (sizeof (struct file_stack
));
1761 fs
->location
= input_location
;
1762 fs
->next
= input_file_stack
;
1763 input_filename
= file
;
1765 input_file_stack
= fs
;
1766 input_file_stack_tick
++;
1769 /* Pop the top entry off the stack of presently open source files.
1770 Restore the INPUT_LOCATION from the new topmost entry on the
1776 struct file_stack
*fs
;
1778 fs
= input_file_stack
;
1779 input_location
= fs
->location
;
1780 input_file_stack
= fs
->next
;
1782 input_file_stack_tick
++;
1785 /* Compile an entire translation unit. Write a file of assembly
1786 output and various debugging dumps. */
1791 /* Initialize yet another pass. */
1793 init_final (main_input_filename
);
1794 coverage_init (aux_base_name
);
1796 timevar_push (TV_PARSE
);
1798 /* Call the parser, which parses the entire file (calling
1799 rest_of_compilation for each function). */
1800 (*lang_hooks
.parse_file
) (set_yydebug
);
1802 /* In case there were missing block closers,
1803 get us back to the global binding level. */
1804 (*lang_hooks
.clear_binding_stack
) ();
1806 /* Compilation is now finished except for writing
1807 what's left of the symbol table output. */
1808 timevar_pop (TV_PARSE
);
1810 if (flag_syntax_only
)
1813 (*lang_hooks
.decls
.final_write_globals
)();
1815 cgraph_varpool_assemble_pending_decls ();
1817 /* This must occur after the loop to output deferred functions.
1818 Else the coverage initializer would not be emitted if all the
1819 functions in this compilation unit were deferred. */
1822 /* Write out any pending weak symbol declarations. */
1826 /* Do dbx symbols. */
1827 timevar_push (TV_SYMOUT
);
1829 #ifdef DWARF2_UNWIND_INFO
1830 if (dwarf2out_do_frame ())
1831 dwarf2out_frame_finish ();
1834 (*debug_hooks
->finish
) (main_input_filename
);
1835 timevar_pop (TV_SYMOUT
);
1837 /* Output some stuff at end of file if nec. */
1839 dw2_output_indirect_constants ();
1841 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
1843 timevar_push (TV_DUMP
);
1844 open_dump_file (DFI_bp
, NULL
);
1848 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
1849 timevar_pop (TV_DUMP
);
1852 targetm
.asm_out
.file_end ();
1854 /* Attach a special .ident directive to the end of the file to identify
1855 the version of GCC which compiled this code. The format of the .ident
1856 string is patterned after the ones produced by native SVR4 compilers. */
1859 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
1860 IDENT_ASM_OP
, version_string
);
1863 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
1865 timevar_push (TV_DUMP
);
1866 dump_combine_total_stats (rtl_dump_file
);
1867 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
1868 timevar_pop (TV_DUMP
);
1872 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1873 and TYPE_DECL nodes.
1875 This does nothing for local (non-static) variables, unless the
1876 variable is a register variable with an ASMSPEC. In that case, or
1877 if the variable is not an automatic, it sets up the RTL and
1878 outputs any assembler code (label definition, storage allocation
1879 and initialization).
1881 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1882 the assembler symbol name to be used. TOP_LEVEL is nonzero
1883 if this declaration is not within a function. */
1886 rest_of_decl_compilation (tree decl
,
1887 const char *asmspec
,
1891 /* We deferred calling assemble_alias so that we could collect
1892 other attributes such as visibility. Emit the alias now. */
1895 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
1898 alias
= TREE_VALUE (TREE_VALUE (alias
));
1899 alias
= get_identifier (TREE_STRING_POINTER (alias
));
1900 assemble_alias (decl
, alias
);
1904 /* Forward declarations for nested functions are not "external",
1905 but we need to treat them as if they were. */
1906 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
1907 || TREE_CODE (decl
) == FUNCTION_DECL
)
1909 timevar_push (TV_VARCONST
);
1912 make_decl_rtl (decl
, asmspec
);
1914 /* Don't output anything when a tentative file-scope definition
1915 is seen. But at end of compilation, do output code for them.
1917 We do output all variables when unit-at-a-time is active and rely on
1918 callgraph code to defer them except for forward declarations
1919 (see gcc.c-torture/compile/920624-1.c) */
1921 || !DECL_DEFER_OUTPUT (decl
)
1922 || (flag_unit_at_a_time
&& DECL_INITIAL (decl
)))
1923 && !DECL_EXTERNAL (decl
))
1925 if (flag_unit_at_a_time
&& !cgraph_global_info_ready
1926 && TREE_CODE (decl
) != FUNCTION_DECL
&& top_level
)
1927 cgraph_varpool_finalize_decl (decl
);
1929 assemble_variable (decl
, top_level
, at_end
, 0);
1932 #ifdef ASM_FINISH_DECLARE_OBJECT
1933 if (decl
== last_assemble_variable_decl
)
1935 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
1940 timevar_pop (TV_VARCONST
);
1942 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
1944 if (decode_reg_name (asmspec
) >= 0)
1946 SET_DECL_RTL (decl
, NULL_RTX
);
1947 make_decl_rtl (decl
, asmspec
);
1951 error ("invalid register name `%s' for register variable", asmspec
);
1952 DECL_REGISTER (decl
) = 0;
1957 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1958 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
1959 && TREE_CODE (decl
) == TYPE_DECL
)
1961 timevar_push (TV_SYMOUT
);
1962 dbxout_symbol (decl
, 0);
1963 timevar_pop (TV_SYMOUT
);
1966 #ifdef SDB_DEBUGGING_INFO
1967 else if (write_symbols
== SDB_DEBUG
&& top_level
1968 && TREE_CODE (decl
) == TYPE_DECL
)
1970 timevar_push (TV_SYMOUT
);
1971 sdbout_symbol (decl
, 0);
1972 timevar_pop (TV_SYMOUT
);
1975 #ifdef DWARF2_DEBUGGING_INFO
1976 else if ((write_symbols
== DWARF2_DEBUG
1977 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
1979 && TREE_CODE (decl
) == TYPE_DECL
)
1981 timevar_push (TV_SYMOUT
);
1982 dwarf2out_decl (decl
);
1983 timevar_pop (TV_SYMOUT
);
1988 /* Called after finishing a record, union or enumeral type. */
1991 rest_of_type_compilation (
1992 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1993 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1997 tree type ATTRIBUTE_UNUSED
,
1998 int toplev ATTRIBUTE_UNUSED
2002 /* Avoid confusing the debug information machinery when there are
2004 if (errorcount
!= 0 || sorrycount
!= 0)
2007 timevar_push (TV_SYMOUT
);
2008 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2009 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2010 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2012 #ifdef SDB_DEBUGGING_INFO
2013 if (write_symbols
== SDB_DEBUG
)
2014 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2016 #ifdef DWARF2_DEBUGGING_INFO
2017 if ((write_symbols
== DWARF2_DEBUG
2018 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2020 dwarf2out_decl (TYPE_STUB_DECL (type
));
2022 timevar_pop (TV_SYMOUT
);
2025 /* Turn the RTL into assembly. */
2027 rest_of_handle_final (tree decl
, rtx insns
)
2029 timevar_push (TV_FINAL
);
2034 /* Get the function's name, as described by its RTL. This may be
2035 different from the DECL_NAME name used in the source file. */
2037 x
= DECL_RTL (decl
);
2038 if (GET_CODE (x
) != MEM
)
2041 if (GET_CODE (x
) != SYMBOL_REF
)
2043 fnname
= XSTR (x
, 0);
2045 assemble_start_function (decl
, fnname
);
2046 final_start_function (insns
, asm_out_file
, optimize
);
2047 final (insns
, asm_out_file
, optimize
, 0);
2048 final_end_function ();
2050 #ifdef IA64_UNWIND_INFO
2051 /* ??? The IA-64 ".handlerdata" directive must be issued before
2052 the ".endp" directive that closes the procedure descriptor. */
2053 output_function_exception_table ();
2056 assemble_end_function (decl
, fnname
);
2058 #ifndef IA64_UNWIND_INFO
2059 /* Otherwise, it feels unclean to switch sections in the middle. */
2060 output_function_exception_table ();
2064 fflush (asm_out_file
);
2066 /* Release all memory allocated by flow. */
2067 free_basic_block_vars (0);
2069 /* Release all memory held by regsets now. */
2070 regset_release_memory ();
2072 timevar_pop (TV_FINAL
);
2078 /* Run delay slot optimization. */
2080 rest_of_handle_delay_slots (tree decl
, rtx insns
)
2082 timevar_push (TV_DBR_SCHED
);
2083 open_dump_file (DFI_dbr
, decl
);
2085 dbr_schedule (insns
, rtl_dump_file
);
2087 close_dump_file (DFI_dbr
, print_rtl
, insns
);
2088 timevar_pop (TV_DBR_SCHED
);
2095 /* Convert register usage from flat register file usage to a stack
2098 rest_of_handle_stack_regs (tree decl
, rtx insns
)
2100 #if defined (HAVE_ATTR_length)
2101 /* If flow2 creates new instructions which need splitting
2102 and scheduling after reload is not done, they might not be
2103 split until final which doesn't allow splitting
2104 if HAVE_ATTR_length. */
2105 #ifdef INSN_SCHEDULING
2106 if (optimize
&& !flag_schedule_insns_after_reload
)
2111 timevar_push (TV_SHORTEN_BRANCH
);
2112 split_all_insns (1);
2113 timevar_pop (TV_SHORTEN_BRANCH
);
2117 timevar_push (TV_REG_STACK
);
2118 open_dump_file (DFI_stack
, decl
);
2120 if (reg_to_stack (insns
, rtl_dump_file
) && optimize
)
2122 if (cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
2123 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0))
2124 && flag_reorder_blocks
)
2126 reorder_basic_blocks ();
2127 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
2131 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
2132 timevar_pop (TV_REG_STACK
);
2139 /* Machine independent reorg pass. */
2141 rest_of_handle_machine_reorg (tree decl
, rtx insns
)
2143 timevar_push (TV_MACH_DEP
);
2144 open_dump_file (DFI_mach
, decl
);
2146 (*targetm
.machine_dependent_reorg
) ();
2148 close_dump_file (DFI_mach
, print_rtl
, insns
);
2149 timevar_pop (TV_MACH_DEP
);
2155 /* Run new register allocator. Return TRUE if we must exit
2156 rest_of_compilation upon return. */
2158 rest_of_handle_new_regalloc (tree decl
, rtx insns
)
2162 delete_trivially_dead_insns (insns
, max_reg_num ());
2165 timevar_pop (TV_LOCAL_ALLOC
);
2166 if (dump_file
[DFI_lreg
].enabled
)
2168 timevar_push (TV_DUMP
);
2170 close_dump_file (DFI_lreg
, NULL
, NULL
);
2171 timevar_pop (TV_DUMP
);
2174 /* XXX clean up the whole mess to bring live info in shape again. */
2175 timevar_push (TV_GLOBAL_ALLOC
);
2176 open_dump_file (DFI_greg
, decl
);
2178 build_insn_chain (insns
);
2179 failure
= reload (insns
, 0);
2181 timevar_pop (TV_GLOBAL_ALLOC
);
2183 if (dump_file
[DFI_greg
].enabled
)
2185 timevar_push (TV_DUMP
);
2187 dump_global_regs (rtl_dump_file
);
2189 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2190 timevar_pop (TV_DUMP
);
2196 reload_completed
= 1;
2201 /* Run old register allocator. Return TRUE if we must exit
2202 rest_of_compilation upon return. */
2204 rest_of_handle_old_regalloc (tree decl
, rtx insns
)
2209 /* Allocate the reg_renumber array. */
2210 allocate_reg_info (max_regno
, FALSE
, TRUE
);
2212 /* And the reg_equiv_memory_loc array. */
2213 reg_equiv_memory_loc
= xcalloc (max_regno
, sizeof (rtx
));
2215 allocate_initial_values (reg_equiv_memory_loc
);
2217 regclass (insns
, max_reg_num (), rtl_dump_file
);
2218 rebuild_notes
= local_alloc ();
2220 timevar_pop (TV_LOCAL_ALLOC
);
2222 /* Local allocation may have turned an indirect jump into a direct
2223 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2227 timevar_push (TV_JUMP
);
2229 rebuild_jump_labels (insns
);
2230 purge_all_dead_edges (0);
2232 timevar_pop (TV_JUMP
);
2235 if (dump_file
[DFI_lreg
].enabled
)
2237 timevar_push (TV_DUMP
);
2239 dump_flow_info (rtl_dump_file
);
2240 dump_local_alloc (rtl_dump_file
);
2242 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
2243 timevar_pop (TV_DUMP
);
2248 timevar_push (TV_GLOBAL_ALLOC
);
2249 open_dump_file (DFI_greg
, decl
);
2251 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2252 pass fixing up any insns that are invalid. */
2255 failure
= global_alloc (rtl_dump_file
);
2258 build_insn_chain (insns
);
2259 failure
= reload (insns
, 0);
2262 timevar_pop (TV_GLOBAL_ALLOC
);
2264 if (dump_file
[DFI_greg
].enabled
)
2266 timevar_push (TV_DUMP
);
2268 dump_global_regs (rtl_dump_file
);
2270 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2271 timevar_pop (TV_DUMP
);
2277 /* Run the regrename and cprop passes. */
2279 rest_of_handle_regrename (tree decl
, rtx insns
)
2281 timevar_push (TV_RENAME_REGISTERS
);
2282 open_dump_file (DFI_rnreg
, decl
);
2284 if (flag_rename_registers
)
2285 regrename_optimize ();
2286 if (flag_cprop_registers
)
2287 copyprop_hardreg_forward ();
2289 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
2290 timevar_pop (TV_RENAME_REGISTERS
);
2293 /* Reorder basic blocks. */
2295 rest_of_handle_reorder_blocks (tree decl
, rtx insns
)
2297 open_dump_file (DFI_bbro
, decl
);
2299 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2300 splitting possibly introduced more crossjumping opportunities. */
2301 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
2302 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
2304 if (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
)
2306 if (flag_reorder_blocks
)
2307 reorder_basic_blocks ();
2308 if (flag_reorder_blocks
2309 || (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
))
2310 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2312 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
2315 #ifdef INSN_SCHEDULING
2316 /* Run instruction scheduler. */
2318 rest_of_handle_sched (tree decl
, rtx insns
)
2320 timevar_push (TV_SCHED
);
2322 /* Print function header into sched dump now
2323 because doing the sched analysis makes some of the dump. */
2324 if (optimize
> 0 && flag_schedule_insns
)
2326 open_dump_file (DFI_sched
, decl
);
2328 /* Do control and data sched analysis,
2329 and write some of the results to dump file. */
2331 schedule_insns (rtl_dump_file
);
2333 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
2335 timevar_pop (TV_SCHED
);
2340 /* Run second scheduling pass after reload. */
2342 rest_of_handle_sched2 (tree decl
, rtx insns
)
2344 timevar_push (TV_SCHED2
);
2345 open_dump_file (DFI_sched2
, decl
);
2347 /* Do control and data sched analysis again,
2348 and write some more of the results to dump file. */
2350 split_all_insns (1);
2352 if (flag_sched2_use_superblocks
|| flag_sched2_use_traces
)
2354 schedule_ebbs (rtl_dump_file
);
2355 /* No liveness updating code yet, but it should be easy to do.
2356 reg-stack recompute the liveness when needed for now. */
2357 count_or_remove_death_notes (NULL
, 1);
2358 cleanup_cfg (CLEANUP_EXPENSIVE
);
2361 schedule_insns (rtl_dump_file
);
2363 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
2364 timevar_pop (TV_SCHED2
);
2370 /* Register allocation pre-pass, to reduce number of moves necessary
2371 for two-address machines. */
2373 rest_of_handle_regmove (tree decl
, rtx insns
)
2375 timevar_push (TV_REGMOVE
);
2376 open_dump_file (DFI_regmove
, decl
);
2378 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
2380 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2381 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
2382 timevar_pop (TV_REGMOVE
);
2389 rest_of_handle_tracer (tree decl
, rtx insns
)
2391 open_dump_file (DFI_tracer
, decl
);
2393 dump_flow_info (rtl_dump_file
);
2395 cleanup_cfg (CLEANUP_EXPENSIVE
);
2396 reg_scan (insns
, max_reg_num (), 0);
2397 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2400 /* If-conversion and CFG cleanup. */
2402 rest_of_handle_if_conversion (tree decl
, rtx insns
)
2404 open_dump_file (DFI_ce1
, decl
);
2405 if (flag_if_conversion
)
2407 timevar_push (TV_IFCVT
);
2409 dump_flow_info (rtl_dump_file
);
2410 cleanup_cfg (CLEANUP_EXPENSIVE
);
2411 reg_scan (insns
, max_reg_num (), 0);
2413 timevar_pop (TV_IFCVT
);
2415 timevar_push (TV_JUMP
);
2416 cleanup_cfg (CLEANUP_EXPENSIVE
);
2417 reg_scan (insns
, max_reg_num (), 0);
2418 timevar_pop (TV_JUMP
);
2419 close_dump_file (DFI_ce1
, print_rtl_with_bb
, get_insns ());
2422 /* Rerun if-conversion, as combine may have simplified things enough
2423 to now meet sequence length restrictions. */
2425 rest_of_handle_if_after_combine (tree decl
, rtx insns
)
2427 timevar_push (TV_IFCVT
);
2428 open_dump_file (DFI_ce2
, decl
);
2434 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
2435 timevar_pop (TV_IFCVT
);
2439 rest_of_handle_web (tree decl
, rtx insns
)
2441 open_dump_file (DFI_web
, decl
);
2442 timevar_push (TV_WEB
);
2444 delete_trivially_dead_insns (insns
, max_reg_num ());
2445 cleanup_cfg (CLEANUP_EXPENSIVE
);
2447 timevar_pop (TV_WEB
);
2448 close_dump_file (DFI_web
, print_rtl_with_bb
, insns
);
2449 reg_scan (get_insns (), max_reg_num (), 0);
2452 /* Do branch profiling and static profile estimation passes. */
2454 rest_of_handle_branch_prob (tree decl
, rtx insns
)
2458 timevar_push (TV_BRANCH_PROB
);
2459 open_dump_file (DFI_bp
, decl
);
2461 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2464 /* Discover and record the loop depth at the head of each basic
2465 block. The loop infrastructure does the real job for us. */
2466 flow_loops_find (&loops
, LOOP_TREE
);
2469 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2471 /* Estimate using heuristics if no profiling info is available. */
2472 if (flag_guess_branch_prob
)
2473 estimate_probability (&loops
);
2475 flow_loops_free (&loops
);
2476 free_dominance_info (CDI_DOMINATORS
);
2477 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2478 timevar_pop (TV_BRANCH_PROB
);
2481 /* Do optimizations based on expression value profiles. */
2483 rest_of_handle_value_profile_transformations (tree decl
, rtx insns
)
2485 open_dump_file (DFI_vpt
, decl
);
2486 timevar_push (TV_VPT
);
2488 if (value_profile_transformations ())
2489 cleanup_cfg (CLEANUP_EXPENSIVE
);
2491 timevar_pop (TV_VPT
);
2492 close_dump_file (DFI_vpt
, print_rtl_with_bb
, insns
);
2495 /* Do control and data flow analysis; write some of the results to the
2498 rest_of_handle_cfg (tree decl
, rtx insns
)
2500 open_dump_file (DFI_cfg
, decl
);
2502 dump_flow_info (rtl_dump_file
);
2504 cleanup_cfg (CLEANUP_EXPENSIVE
2505 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2507 /* It may make more sense to mark constant functions after dead code is
2508 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2509 may insert code making function non-constant, but we still must consider
2510 it as constant, otherwise -fbranch-probabilities will not read data back.
2512 life_analysis rarely eliminates modification of external memory.
2516 /* Alias analysis depends on this information and mark_constant_function
2517 depends on alias analysis. */
2518 reg_scan (insns
, max_reg_num (), 1);
2519 mark_constant_function ();
2522 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2525 /* Purge addressofs. */
2527 rest_of_handle_addressof (tree decl
, rtx insns
)
2529 open_dump_file (DFI_addressof
, decl
);
2531 purge_addressof (insns
);
2532 if (optimize
&& purge_all_dead_edges (0))
2533 delete_unreachable_blocks ();
2534 reg_scan (insns
, max_reg_num (), 1);
2536 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2539 /* We may have potential sibling or tail recursion sites. Select one
2540 (of possibly multiple) methods of performing the call. */
2542 rest_of_handle_sibling_calls (rtx insns
)
2545 optimize_sibling_and_tail_recursive_calls ();
2547 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2548 free_bb_for_insn ();
2549 find_exception_handler_labels ();
2550 rebuild_jump_labels (insns
);
2551 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2553 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2554 notes before simplifying cfg and we must do lowering after sibcall
2555 that unhides parts of RTL chain and cleans up the CFG.
2557 Until sibcall is replaced by tree-level optimizer, lets just
2558 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2559 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2560 if (GET_CODE (insn
) == NOTE
2561 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2564 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2567 /* Perform jump bypassing and control flow optimizations. */
2569 rest_of_handle_jump_bypass (tree decl
, rtx insns
)
2571 timevar_push (TV_BYPASS
);
2572 open_dump_file (DFI_bypass
, decl
);
2574 cleanup_cfg (CLEANUP_EXPENSIVE
);
2575 reg_scan (insns
, max_reg_num (), 1);
2577 if (bypass_jumps (rtl_dump_file
))
2579 rebuild_jump_labels (insns
);
2580 cleanup_cfg (CLEANUP_EXPENSIVE
);
2581 delete_trivially_dead_insns (insns
, max_reg_num ());
2584 close_dump_file (DFI_bypass
, print_rtl_with_bb
, insns
);
2585 timevar_pop (TV_BYPASS
);
2589 #ifdef ENABLE_CHECKING
2590 verify_flow_info ();
2594 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2595 if we must exit rest_of_compilation upon return. */
2597 rest_of_handle_inlining (tree decl
)
2604 /* If we are reconsidering an inline function at the end of
2605 compilation, skip the stuff for making it inline. */
2606 if (cfun
->rtl_inline_init
)
2608 cfun
->rtl_inline_init
= 1;
2610 /* If this is nested inside an inlined external function, pretend
2611 it was only declared. Since we cannot inline such functions,
2612 generating code for this one is not only not necessary but will
2613 confuse some debugging output writers. */
2614 for (parent
= DECL_CONTEXT (current_function_decl
);
2615 parent
!= NULL_TREE
;
2616 parent
= get_containing_scope (parent
))
2617 if (TREE_CODE (parent
) == FUNCTION_DECL
2618 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2620 DECL_INITIAL (decl
) = 0;
2623 else if (TYPE_P (parent
))
2624 /* A function in a local class should be treated normally. */
2627 /* If requested, consider whether to make this function inline. */
2628 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2629 || flag_inline_functions
)
2631 timevar_push (TV_INTEGRATION
);
2632 lose
= function_cannot_inline_p (decl
);
2633 timevar_pop (TV_INTEGRATION
);
2634 if (lose
|| ! optimize
)
2636 if (warn_inline
&& lose
&& DECL_INLINE (decl
))
2638 char *msg
= concat ("%J", lose
, NULL
);
2639 warning (msg
, decl
);
2642 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2643 /* Don't really compile an extern inline function.
2644 If we can't make it inline, pretend
2645 it was only declared. */
2646 if (DECL_EXTERNAL (decl
))
2648 DECL_INITIAL (decl
) = 0;
2653 inlinable
= DECL_INLINE (decl
) = 1;
2656 insns
= get_insns ();
2658 /* Dump the rtl code if we are dumping rtl. */
2660 if (open_dump_file (DFI_rtl
, decl
))
2662 if (DECL_SAVED_INSNS (decl
) && DECL_SAVED_INSNS (decl
)->saved_for_inline
)
2663 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2664 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2667 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2668 sorts of eh initialization. Delay this until after the
2669 initial rtl dump so that we can see the original nesting. */
2670 convert_from_eh_region_ranges ();
2672 /* If function is inline, and we don't yet know whether to
2673 compile it by itself, defer decision till end of compilation.
2674 wrapup_global_declarations will (indirectly) call
2675 rest_of_compilation again for those functions that need to
2676 be output. Also defer those functions that we are supposed
2680 || (DECL_INLINE (decl
)
2681 /* Egad. This RTL deferral test conflicts with Fortran assumptions
2682 for unreferenced symbols. See g77.f-torture/execute/980520-1.f.
2683 But removing this line from the check breaks all languages that
2684 use the call graph to output symbols. This hard-coded check is
2685 the least invasive work-around. */
2686 && (flag_inline_functions
2687 || strcmp (lang_hooks
.name
, "GNU F77") == 0)
2688 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2689 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2690 && ! flag_keep_inline_functions
)
2691 || DECL_EXTERNAL (decl
))))
2692 DECL_DEFER_OUTPUT (decl
) = 1;
2694 if (DECL_INLINE (decl
))
2695 /* DWARF wants separate debugging info for abstract and
2696 concrete instances of all inline functions, including those
2697 declared inline but not inlined, and those inlined even
2698 though they weren't declared inline. Conveniently, that's
2699 what DECL_INLINE means at this point. */
2700 (*debug_hooks
->deferred_inline_function
) (decl
);
2702 if (DECL_DEFER_OUTPUT (decl
))
2704 /* If -Wreturn-type, we have to do a bit of compilation. We just
2705 want to call cleanup the cfg to figure out whether or not we can
2706 fall off the end of the function; we do the minimum amount of
2707 work necessary to make that safe. */
2708 if (warn_return_type
)
2710 int saved_optimize
= optimize
;
2713 rebuild_jump_labels (insns
);
2714 find_exception_handler_labels ();
2715 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2716 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2717 optimize
= saved_optimize
;
2719 /* CFG is no longer maintained up-to-date. */
2720 free_bb_for_insn ();
2723 set_nothrow_function_flags ();
2724 if (current_function_nothrow
)
2725 /* Now we know that this can't throw; set the flag for the benefit
2726 of other functions later in this translation unit. */
2727 TREE_NOTHROW (current_function_decl
) = 1;
2729 timevar_push (TV_INTEGRATION
);
2730 save_for_inline (decl
);
2731 timevar_pop (TV_INTEGRATION
);
2732 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2736 /* If specified extern inline but we aren't inlining it, we are
2737 done. This goes for anything that gets here with DECL_EXTERNAL
2738 set, not just things with DECL_INLINE. */
2739 return (bool) DECL_EXTERNAL (decl
);
2742 /* Try to identify useless null pointer tests and delete them. */
2744 rest_of_handle_null_pointer (tree decl
, rtx insns
)
2746 open_dump_file (DFI_null
, decl
);
2748 dump_flow_info (rtl_dump_file
);
2750 if (delete_null_pointer_checks (insns
))
2751 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2753 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2756 /* Try combining insns through substitution. */
2758 rest_of_handle_combine (tree decl
, rtx insns
)
2760 int rebuild_jump_labels_after_combine
= 0;
2762 timevar_push (TV_COMBINE
);
2763 open_dump_file (DFI_combine
, decl
);
2765 rebuild_jump_labels_after_combine
2766 = combine_instructions (insns
, max_reg_num ());
2768 /* Combining insns may have turned an indirect jump into a
2769 direct jump. Rebuild the JUMP_LABEL fields of jumping
2771 if (rebuild_jump_labels_after_combine
)
2773 timevar_push (TV_JUMP
);
2774 rebuild_jump_labels (insns
);
2775 timevar_pop (TV_JUMP
);
2777 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2780 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
2781 timevar_pop (TV_COMBINE
);
2786 /* Perform life analysis. */
2788 rest_of_handle_life (tree decl
, rtx insns
)
2790 open_dump_file (DFI_life
, decl
);
2793 #ifdef ENABLE_CHECKING
2794 verify_flow_info ();
2796 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
2798 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
2799 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2800 timevar_pop (TV_FLOW
);
2802 if (warn_uninitialized
)
2804 uninitialized_vars_warning (DECL_INITIAL (decl
));
2806 setjmp_args_warning ();
2811 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
2813 /* Insns were inserted, and possibly pseudos created, so
2814 things might look a bit different. */
2815 insns
= get_insns ();
2816 allocate_reg_life_data ();
2817 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
2818 PROP_LOG_LINKS
| PROP_REG_INFO
| PROP_DEATH_NOTES
);
2824 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
2829 /* Perform common subexpression elimination. Nonzero value from
2830 `cse_main' means that jumps were simplified and some code may now
2831 be unreachable, so do jump optimization again. */
2833 rest_of_handle_cse (tree decl
, rtx insns
)
2837 open_dump_file (DFI_cse
, decl
);
2839 dump_flow_info (rtl_dump_file
);
2840 timevar_push (TV_CSE
);
2842 reg_scan (insns
, max_reg_num (), 1);
2844 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2846 rebuild_jump_labels (insns
);
2847 if (purge_all_dead_edges (0))
2848 delete_unreachable_blocks ();
2850 delete_trivially_dead_insns (insns
, max_reg_num ());
2852 /* If we are not running more CSE passes, then we are no longer
2853 expecting CSE to be run. But always rerun it in a cheap mode. */
2854 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2856 if (tem
|| optimize
> 1)
2857 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2858 /* Try to identify useless null pointer tests and delete them. */
2859 if (flag_delete_null_pointer_checks
)
2861 timevar_push (TV_JUMP
);
2863 if (delete_null_pointer_checks (insns
))
2864 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2865 timevar_pop (TV_JUMP
);
2868 /* The second pass of jump optimization is likely to have
2869 removed a bunch more instructions. */
2870 renumber_insns (rtl_dump_file
);
2872 timevar_pop (TV_CSE
);
2873 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2876 /* Run second CSE pass after loop optimizations. */
2878 rest_of_handle_cse2 (tree decl
, rtx insns
)
2882 timevar_push (TV_CSE2
);
2883 open_dump_file (DFI_cse2
, decl
);
2885 dump_flow_info (rtl_dump_file
);
2886 /* CFG is no longer maintained up-to-date. */
2887 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2888 purge_all_dead_edges (0);
2889 delete_trivially_dead_insns (insns
, max_reg_num ());
2893 timevar_push (TV_JUMP
);
2894 rebuild_jump_labels (insns
);
2895 cleanup_cfg (CLEANUP_EXPENSIVE
);
2896 timevar_pop (TV_JUMP
);
2898 reg_scan (insns
, max_reg_num (), 0);
2899 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
2901 timevar_pop (TV_CSE2
);
2904 /* Perform global cse. */
2906 rest_of_handle_gcse (tree decl
, rtx insns
)
2908 int save_csb
, save_cfj
;
2911 timevar_push (TV_GCSE
);
2912 open_dump_file (DFI_gcse
, decl
);
2914 tem
= gcse_main (insns
, rtl_dump_file
);
2915 rebuild_jump_labels (insns
);
2916 delete_trivially_dead_insns (insns
, max_reg_num ());
2918 save_csb
= flag_cse_skip_blocks
;
2919 save_cfj
= flag_cse_follow_jumps
;
2920 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2922 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2923 if (current_function_calls_constant_p
)
2924 purge_builtin_constant_p ();
2926 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2928 if (flag_expensive_optimizations
)
2930 timevar_push (TV_CSE
);
2931 reg_scan (insns
, max_reg_num (), 1);
2932 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2933 purge_all_dead_edges (0);
2934 delete_trivially_dead_insns (insns
, max_reg_num ());
2935 timevar_pop (TV_CSE
);
2936 cse_not_expected
= !flag_rerun_cse_after_loop
;
2939 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2940 things up. Then possibly re-run CSE again. */
2944 timevar_push (TV_JUMP
);
2945 rebuild_jump_labels (insns
);
2946 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2947 timevar_pop (TV_JUMP
);
2949 if (flag_expensive_optimizations
)
2951 timevar_push (TV_CSE
);
2952 reg_scan (insns
, max_reg_num (), 1);
2953 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2954 purge_all_dead_edges (0);
2955 delete_trivially_dead_insns (insns
, max_reg_num ());
2956 timevar_pop (TV_CSE
);
2960 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2961 timevar_pop (TV_GCSE
);
2964 flag_cse_skip_blocks
= save_csb
;
2965 flag_cse_follow_jumps
= save_cfj
;
2966 #ifdef ENABLE_CHECKING
2967 verify_flow_info ();
2971 /* Move constant computations out of loops. */
2973 rest_of_handle_loop_optimize (tree decl
, rtx insns
)
2975 int do_unroll
, do_prefetch
;
2977 timevar_push (TV_LOOP
);
2978 delete_dead_jumptables ();
2979 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2980 open_dump_file (DFI_loop
, decl
);
2982 /* CFG is no longer maintained up-to-date. */
2983 free_bb_for_insn ();
2985 if (flag_unroll_loops
)
2986 do_unroll
= LOOP_AUTO_UNROLL
; /* Having two unrollers is useless. */
2988 do_unroll
= flag_old_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
2989 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
2991 if (flag_rerun_loop_opt
)
2993 cleanup_barriers ();
2995 /* We only want to perform unrolling once. */
2996 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
2999 /* The first call to loop_optimize makes some instructions
3000 trivially dead. We delete those instructions now in the
3001 hope that doing so will make the heuristics in loop work
3002 better and possibly speed up compilation. */
3003 delete_trivially_dead_insns (insns
, max_reg_num ());
3005 /* The regscan pass is currently necessary as the alias
3006 analysis code depends on this information. */
3007 reg_scan (insns
, max_reg_num (), 1);
3009 cleanup_barriers ();
3010 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
3012 /* Loop can create trivially dead instructions. */
3013 delete_trivially_dead_insns (insns
, max_reg_num ());
3014 close_dump_file (DFI_loop
, print_rtl
, insns
);
3015 timevar_pop (TV_LOOP
);
3016 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3021 /* Perform loop optimizations. It might be better to do them a bit
3022 sooner, but we want the profile feedback to work more
3025 rest_of_handle_loop2 (tree decl
, rtx insns
)
3027 struct loops
*loops
;
3028 timevar_push (TV_LOOP
);
3029 open_dump_file (DFI_loop2
, decl
);
3031 dump_flow_info (rtl_dump_file
);
3033 loops
= loop_optimizer_init (rtl_dump_file
);
3037 /* The optimizations: */
3038 if (flag_unswitch_loops
)
3039 unswitch_loops (loops
);
3041 if (flag_peel_loops
|| flag_unroll_loops
)
3042 unroll_and_peel_loops (loops
,
3043 (flag_peel_loops
? UAP_PEEL
: 0) |
3044 (flag_unroll_loops
? UAP_UNROLL
: 0) |
3045 (flag_unroll_all_loops
? UAP_UNROLL_ALL
: 0));
3047 loop_optimizer_finalize (loops
, rtl_dump_file
);
3050 cleanup_cfg (CLEANUP_EXPENSIVE
);
3051 delete_trivially_dead_insns (insns
, max_reg_num ());
3052 reg_scan (insns
, max_reg_num (), 0);
3054 dump_flow_info (rtl_dump_file
);
3055 close_dump_file (DFI_loop2
, print_rtl_with_bb
, get_insns ());
3056 timevar_pop (TV_LOOP
);
3060 /* This is called from finish_function (within langhooks.parse_file)
3061 after each top-level definition is parsed.
3062 It is supposed to compile that function or variable
3063 and output the assembler code for it.
3064 After we return, the tree storage is freed. */
3067 rest_of_compilation (tree decl
)
3071 timevar_push (TV_REST_OF_COMPILATION
);
3073 /* Register rtl specific functions for cfg. */
3074 rtl_register_cfg_hooks ();
3076 /* Now that we're out of the frontend, we shouldn't have any more
3077 CONCATs anywhere. */
3078 generating_concat_p
= 0;
3080 /* When processing delayed functions, prepare_function_start() won't
3081 have been run to re-initialize it. */
3082 cse_not_expected
= ! optimize
;
3084 /* First, make sure that NOTE_BLOCK is set correctly for each
3085 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3086 if (!cfun
->x_whole_function_mode_p
)
3089 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3090 tree in sensible shape. So, we just recalculate it here. */
3091 if (cfun
->x_whole_function_mode_p
)
3096 if (rest_of_handle_inlining (decl
))
3097 goto exit_rest_of_compilation
;
3099 /* If we're emitting a nested function, make sure its parent gets
3100 emitted as well. Doing otherwise confuses debug info. */
3103 for (parent
= DECL_CONTEXT (current_function_decl
);
3104 parent
!= NULL_TREE
;
3105 parent
= get_containing_scope (parent
))
3106 if (TREE_CODE (parent
) == FUNCTION_DECL
)
3107 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
3110 /* We are now committed to emitting code for this function. Do any
3111 preparation, such as emitting abstract debug info for the inline
3112 before it gets mangled by optimization. */
3113 if (cgraph_function_possibly_inlined_p (decl
))
3114 (*debug_hooks
->outlining_inline_function
) (decl
);
3116 /* Remove any notes we don't need. That will make iterating
3117 over the instruction sequence faster, and allow the garbage
3118 collector to reclaim the memory used by the notes. */
3119 remove_unnecessary_notes ();
3124 /* Initialize some variables used by the optimizers. */
3125 init_function_for_compilation ();
3127 if (! DECL_DEFER_OUTPUT (decl
))
3128 TREE_ASM_WRITTEN (decl
) = 1;
3130 /* Now that integrate will no longer see our rtl, we need not
3131 distinguish between the return value of this function and the
3132 return value of called functions. Also, we can remove all SETs
3133 of subregs of hard registers; they are only here because of
3134 integrate. Also, we can now initialize pseudos intended to
3135 carry magic hard reg data throughout the function. */
3136 rtx_equal_function_value_matters
= 0;
3137 purge_hard_subreg_sets (get_insns ());
3139 /* Early return if there were errors. We can run afoul of our
3140 consistency checks, and there's not really much point in fixing them.
3141 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3142 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
3143 || errorcount
|| sorrycount
)
3144 goto exit_rest_of_compilation
;
3146 timevar_push (TV_JUMP
);
3147 open_dump_file (DFI_sibling
, decl
);
3148 insns
= get_insns ();
3149 rebuild_jump_labels (insns
);
3150 find_exception_handler_labels ();
3151 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3153 delete_unreachable_blocks ();
3155 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3156 if (flag_guess_branch_prob
)
3158 timevar_push (TV_BRANCH_PROB
);
3159 note_prediction_to_br_prob ();
3160 timevar_pop (TV_BRANCH_PROB
);
3163 if (flag_optimize_sibling_calls
)
3164 rest_of_handle_sibling_calls (insns
);
3166 /* We have to issue these warnings now already, because CFG cleanups
3167 further down may destroy the required information. However, this
3168 must be done after the sibcall optimization pass because the barrier
3169 emitted for noreturn calls that are candidate for the optimization
3170 is folded into the CALL_PLACEHOLDER until after this pass, so the
3171 CFG is inaccurate. */
3172 check_function_return_warnings ();
3174 timevar_pop (TV_JUMP
);
3176 insn_locators_initialize ();
3177 /* Complete generation of exception handling code. */
3180 timevar_push (TV_JUMP
);
3181 open_dump_file (DFI_eh
, decl
);
3183 finish_eh_generation ();
3185 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
3186 timevar_pop (TV_JUMP
);
3189 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3190 generation, which might create new sets. */
3191 emit_initial_value_sets ();
3194 /* If we are doing position-independent code generation, now
3195 is the time to output special prologues and epilogues.
3196 We do not want to do this earlier, because it just clutters
3197 up inline functions with meaningless insns. */
3202 insns
= get_insns ();
3204 /* Copy any shared structure that should not be shared. */
3205 unshare_all_rtl (current_function_decl
, insns
);
3207 #ifdef SETJMP_VIA_SAVE_AREA
3208 /* This must be performed before virtual register instantiation.
3209 Please be aware the everything in the compiler that can look
3210 at the RTL up to this point must understand that REG_SAVE_AREA
3211 is just like a use of the REG contained inside. */
3212 if (current_function_calls_alloca
)
3213 optimize_save_area_alloca (insns
);
3216 /* Instantiate all virtual registers. */
3217 instantiate_virtual_regs (current_function_decl
, insns
);
3219 open_dump_file (DFI_jump
, decl
);
3221 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3222 are initialized and to compute whether control can drop off the end
3225 timevar_push (TV_JUMP
);
3226 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3227 before jump optimization switches branch directions. */
3228 if (flag_guess_branch_prob
)
3229 expected_value_to_br_prob ();
3231 reg_scan (insns
, max_reg_num (), 0);
3232 rebuild_jump_labels (insns
);
3233 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3234 delete_trivially_dead_insns (insns
, max_reg_num ());
3236 dump_flow_info (rtl_dump_file
);
3237 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
3238 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3242 free_bb_for_insn ();
3243 copy_loop_headers (insns
);
3244 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3246 purge_line_number_notes (insns
);
3248 timevar_pop (TV_JUMP
);
3249 close_dump_file (DFI_jump
, print_rtl
, insns
);
3251 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3252 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
3253 goto exit_rest_of_compilation
;
3255 timevar_push (TV_JUMP
);
3258 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3260 if (flag_delete_null_pointer_checks
)
3261 rest_of_handle_null_pointer (decl
, insns
);
3263 /* Jump optimization, and the removal of NULL pointer checks, may
3264 have reduced the number of instructions substantially. CSE, and
3265 future passes, allocate arrays whose dimensions involve the
3266 maximum instruction UID, so if we can reduce the maximum UID
3267 we'll save big on memory. */
3268 renumber_insns (rtl_dump_file
);
3269 timevar_pop (TV_JUMP
);
3271 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
3276 rest_of_handle_cse (decl
, insns
);
3278 rest_of_handle_addressof (decl
, insns
);
3285 rest_of_handle_gcse (decl
, insns
);
3287 if (flag_loop_optimize
)
3288 rest_of_handle_loop_optimize (decl
, insns
);
3291 timevar_push (TV_FLOW
);
3293 rest_of_handle_cfg (decl
, insns
);
3296 || profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3298 rest_of_handle_branch_prob (decl
, insns
);
3300 if (flag_branch_probabilities
3301 && flag_profile_values
3302 && flag_value_profile_transformations
)
3303 rest_of_handle_value_profile_transformations (decl
, insns
);
3305 /* Remove the death notes created for vpt. */
3306 if (flag_profile_values
)
3307 count_or_remove_death_notes (NULL
, 1);
3311 rest_of_handle_if_conversion (decl
, insns
);
3314 rest_of_handle_tracer (decl
, insns
);
3318 if (flag_unswitch_loops
3320 || flag_unroll_loops
)
3321 rest_of_handle_loop2 (decl
, insns
);
3324 rest_of_handle_jump_bypass (decl
, insns
);
3328 rest_of_handle_web (decl
, insns
);
3330 if (flag_rerun_cse_after_loop
)
3331 rest_of_handle_cse2 (decl
, insns
);
3333 cse_not_expected
= 1;
3335 rest_of_handle_life (decl
, insns
);
3338 rest_of_handle_combine (decl
, insns
);
3340 if (flag_if_conversion
)
3341 rest_of_handle_if_after_combine (decl
, insns
);
3343 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3344 rest_of_handle_regmove (decl
, insns
);
3346 /* Do unconditional splitting before register allocation to allow machine
3347 description to add extra information not needed previously. */
3348 split_all_insns (1);
3350 #ifdef OPTIMIZE_MODE_SWITCHING
3351 timevar_push (TV_MODE_SWITCH
);
3354 optimize_mode_switching (NULL
);
3357 timevar_pop (TV_MODE_SWITCH
);
3360 /* Any of the several passes since flow1 will have munged register
3361 lifetime data a bit. We need it to be up to date for scheduling
3362 (see handling of reg_known_equiv in init_alias_analysis). */
3363 recompute_reg_usage (insns
, !optimize_size
);
3365 #ifdef INSN_SCHEDULING
3366 rest_of_handle_sched (decl
, insns
);
3369 /* Determine if the current function is a leaf before running reload
3370 since this can impact optimizations done by the prologue and
3371 epilogue thus changing register elimination offsets. */
3372 current_function_is_leaf
= leaf_function_p ();
3374 timevar_push (TV_LOCAL_ALLOC
);
3375 open_dump_file (DFI_lreg
, decl
);
3377 if (flag_new_regalloc
)
3379 if (rest_of_handle_new_regalloc (decl
, insns
))
3380 goto exit_rest_of_compilation
;
3384 if (rest_of_handle_old_regalloc (decl
, insns
))
3385 goto exit_rest_of_compilation
;
3390 open_dump_file (DFI_postreload
, decl
);
3392 /* Do a very simple CSE pass over just the hard registers. */
3395 timevar_push (TV_RELOAD_CSE_REGS
);
3396 reload_cse_regs (insns
);
3397 /* reload_cse_regs can eliminate potentially-trapping MEMs.
3398 Remove any EH edges associated with them. */
3399 if (flag_non_call_exceptions
)
3400 purge_all_dead_edges (0);
3401 timevar_pop (TV_RELOAD_CSE_REGS
);
3404 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3406 /* Re-create the death notes which were deleted during reload. */
3407 timevar_push (TV_FLOW2
);
3408 open_dump_file (DFI_flow2
, decl
);
3410 #ifdef ENABLE_CHECKING
3411 verify_flow_info ();
3414 /* If optimizing, then go ahead and split insns now. */
3418 split_all_insns (0);
3420 if (flag_branch_target_load_optimize
)
3422 open_dump_file (DFI_branch_target_load
, decl
);
3424 branch_target_load_optimize (insns
, false);
3426 close_dump_file (DFI_branch_target_load
, print_rtl_with_bb
, insns
);
3432 cleanup_cfg (CLEANUP_EXPENSIVE
);
3434 /* On some machines, the prologue and epilogue code, or parts thereof,
3435 can be represented as RTL. Doing so lets us schedule insns between
3436 it and the rest of the code and also allows delayed branch
3437 scheduling to operate in the epilogue. */
3438 thread_prologue_and_epilogue_insns (insns
);
3439 epilogue_completed
= 1;
3443 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3444 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3445 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3447 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3448 even for machines with possibly nonzero RETURN_POPS_ARGS
3449 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3450 push instructions will have popping returns. */
3451 #ifndef PUSH_ROUNDING
3452 if (!ACCUMULATE_OUTGOING_ARGS
)
3454 combine_stack_adjustments ();
3459 flow2_completed
= 1;
3461 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3462 timevar_pop (TV_FLOW2
);
3464 #ifdef HAVE_peephole2
3465 if (optimize
> 0 && flag_peephole2
)
3467 timevar_push (TV_PEEPHOLE2
);
3468 open_dump_file (DFI_peephole2
, decl
);
3470 peephole2_optimize (rtl_dump_file
);
3472 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3473 timevar_pop (TV_PEEPHOLE2
);
3477 if (flag_if_conversion2
)
3479 timevar_push (TV_IFCVT2
);
3480 open_dump_file (DFI_ce3
, decl
);
3484 close_dump_file (DFI_ce3
, print_rtl_with_bb
, insns
);
3485 timevar_pop (TV_IFCVT2
);
3490 if (flag_rename_registers
|| flag_cprop_registers
)
3491 rest_of_handle_regrename (decl
, insns
);
3493 rest_of_handle_reorder_blocks (decl
, insns
);
3496 if (flag_branch_target_load_optimize2
)
3498 /* Leave this a warning for now so that it is possible to experiment
3499 with running this pass twice. In 3.6, we should either make this
3500 an error, or use separate dump files. */
3501 if (flag_branch_target_load_optimize
)
3502 warning ("branch target register load optimization is not intended "
3505 open_dump_file (DFI_branch_target_load
, decl
);
3507 branch_target_load_optimize (insns
, true);
3509 close_dump_file (DFI_branch_target_load
, print_rtl_with_bb
, insns
);
3514 #ifdef INSN_SCHEDULING
3515 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3516 rest_of_handle_sched2 (decl
, insns
);
3519 #ifdef LEAF_REGISTERS
3520 current_function_uses_only_leaf_regs
3521 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3525 rest_of_handle_stack_regs (decl
, insns
);
3528 compute_alignments ();
3530 /* CFG is no longer maintained up-to-date. */
3531 free_bb_for_insn ();
3533 if (targetm
.machine_dependent_reorg
!= 0)
3534 rest_of_handle_machine_reorg (decl
, insns
);
3536 purge_line_number_notes (insns
);
3537 cleanup_barriers ();
3540 if (optimize
> 0 && flag_delayed_branch
)
3541 rest_of_handle_delay_slots (decl
, insns
);
3544 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3545 timevar_push (TV_SHORTEN_BRANCH
);
3546 split_all_insns_noflow ();
3547 timevar_pop (TV_SHORTEN_BRANCH
);
3550 convert_to_eh_region_ranges ();
3552 /* Shorten branches. */
3553 timevar_push (TV_SHORTEN_BRANCH
);
3554 shorten_branches (get_insns ());
3555 timevar_pop (TV_SHORTEN_BRANCH
);
3557 set_nothrow_function_flags ();
3558 if (current_function_nothrow
)
3559 /* Now we know that this can't throw; set the flag for the benefit
3560 of other functions later in this translation unit. */
3561 TREE_NOTHROW (current_function_decl
) = 1;
3563 rest_of_handle_final (decl
, insns
);
3565 /* Write DBX symbols if requested. */
3567 /* Note that for those inline functions where we don't initially
3568 know for certain that we will be generating an out-of-line copy,
3569 the first invocation of this routine (rest_of_compilation) will
3570 skip over this code by doing a `goto exit_rest_of_compilation;'.
3571 Later on, wrapup_global_declarations will (indirectly) call
3572 rest_of_compilation again for those inline functions that need
3573 to have out-of-line copies generated. During that call, we
3574 *will* be routed past here. */
3576 timevar_push (TV_SYMOUT
);
3577 (*debug_hooks
->function_decl
) (decl
);
3578 timevar_pop (TV_SYMOUT
);
3580 exit_rest_of_compilation
:
3582 coverage_end_function ();
3584 /* In case the function was not output,
3585 don't leave any temporary anonymous types
3586 queued up for sdb output. */
3587 #ifdef SDB_DEBUGGING_INFO
3588 if (write_symbols
== SDB_DEBUG
)
3589 sdbout_types (NULL_TREE
);
3592 reload_completed
= 0;
3593 epilogue_completed
= 0;
3594 flow2_completed
= 0;
3597 timevar_push (TV_FINAL
);
3599 /* Clear out the insn_length contents now that they are no
3601 init_insn_lengths ();
3603 /* Show no temporary slots allocated. */
3606 free_basic_block_vars (0);
3607 free_bb_for_insn ();
3609 timevar_pop (TV_FINAL
);
3611 if ((*targetm
.binds_local_p
) (current_function_decl
))
3613 int pref
= cfun
->preferred_stack_boundary
;
3614 if (cfun
->recursive_call_emit
3615 && cfun
->stack_alignment_needed
> cfun
->preferred_stack_boundary
)
3616 pref
= cfun
->stack_alignment_needed
;
3617 cgraph_rtl_info (current_function_decl
)->preferred_incoming_stack_boundary
3621 /* Make sure volatile mem refs aren't considered valid operands for
3622 arithmetic insns. We must call this here if this is a nested inline
3623 function, since the above code leaves us in the init_recog state
3624 (from final.c), and the function context push/pop code does not
3625 save/restore volatile_ok.
3627 ??? Maybe it isn't necessary for expand_start_function to call this
3628 anymore if we do it here? */
3630 init_recog_no_volatile ();
3632 /* We're done with this function. Free up memory if we can. */
3633 free_after_parsing (cfun
);
3634 if (! DECL_DEFER_OUTPUT (decl
))
3636 free_after_compilation (cfun
);
3637 DECL_SAVED_INSNS (decl
) = 0;
3643 timevar_pop (TV_REST_OF_COMPILATION
);
3646 /* Display help for target options. */
3648 display_target_options (void)
3651 static bool displayed
= false;
3653 /* Avoid double printing for --help --target-help. */
3659 if (ARRAY_SIZE (target_switches
) > 1
3660 #ifdef TARGET_OPTIONS
3661 || ARRAY_SIZE (target_options
) > 1
3669 printf (_("\nTarget specific options:\n"));
3671 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3673 const char *option
= target_switches
[i
].name
;
3674 const char *description
= target_switches
[i
].description
;
3676 if (option
== NULL
|| *option
== 0)
3678 else if (description
== NULL
)
3683 printf (_(" -m%-23s [undocumented]\n"), option
);
3685 else if (*description
!= 0)
3686 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
3689 #ifdef TARGET_OPTIONS
3690 for (i
= ARRAY_SIZE (target_options
); i
--;)
3692 const char *option
= target_options
[i
].prefix
;
3693 const char *description
= target_options
[i
].description
;
3695 if (option
== NULL
|| *option
== 0)
3697 else if (description
== NULL
)
3702 printf (_(" -m%-23s [undocumented]\n"), option
);
3704 else if (*description
!= 0)
3705 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
3711 printf (_("\nThere are undocumented target specific options as well.\n"));
3713 printf (_(" They exist, but they are not documented.\n"));
3718 /* Parse a -d... command line switch. */
3721 decode_d_option (const char *arg
)
3729 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3730 dump_file
[i
].enabled
= 1;
3736 flag_print_asm_name
= 1;
3739 flag_dump_rtl_in_asm
= 1;
3740 flag_print_asm_name
= 1;
3743 graph_dump_format
= vcg
;
3746 rtl_dump_and_exit
= 1;
3751 case 'D': /* These are handled by the preprocessor. */
3755 setup_core_dumping();
3760 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3761 if (c
== dump_file
[i
].debug_switch
)
3763 dump_file
[i
].enabled
= 1;
3768 warning ("unrecognized gcc debugging option: %c", c
);
3773 /* Indexed by enum debug_info_type. */
3774 const char *const debug_type_names
[] =
3776 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3779 /* Decode -m switches. */
3780 /* Decode the switch -mNAME. */
3783 set_target_switch (const char *name
)
3786 int valid_target_option
= 0;
3788 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
3789 if (!strcmp (target_switches
[j
].name
, name
))
3791 if (target_switches
[j
].value
< 0)
3792 target_flags
&= ~-target_switches
[j
].value
;
3794 target_flags
|= target_switches
[j
].value
;
3797 if (target_switches
[j
].value
< 0)
3798 target_flags_explicit
|= -target_switches
[j
].value
;
3800 target_flags_explicit
|= target_switches
[j
].value
;
3802 valid_target_option
= 1;
3805 #ifdef TARGET_OPTIONS
3806 if (!valid_target_option
)
3807 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
3809 int len
= strlen (target_options
[j
].prefix
);
3810 if (target_options
[j
].value
)
3812 if (!strcmp (target_options
[j
].prefix
, name
))
3814 *target_options
[j
].variable
= target_options
[j
].value
;
3815 valid_target_option
= 1;
3820 if (!strncmp (target_options
[j
].prefix
, name
, len
))
3822 *target_options
[j
].variable
= name
+ len
;
3823 valid_target_option
= 1;
3829 if (!valid_target_option
)
3830 error ("invalid option `%s'", name
);
3833 /* Print version information to FILE.
3834 Each line begins with INDENT (for the case where FILE is the
3835 assembler output file). */
3838 print_version (FILE *file
, const char *indent
)
3841 #define __VERSION__ "[?]"
3845 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3847 "%s%s%s version %s (%s) compiled by CC.\n"
3849 , indent
, *indent
!= 0 ? " " : "",
3850 lang_hooks
.name
, version_string
, TARGET_NAME
,
3851 indent
, __VERSION__
);
3852 fnotice (file
, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3853 indent
, *indent
!= 0 ? " " : "",
3854 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
3857 /* Print an option value and return the adjusted position in the line.
3858 ??? We don't handle error returns from fprintf (disk full); presumably
3859 other code will catch a disk full though. */
3862 print_single_switch (FILE *file
, int pos
, int max
,
3863 const char *indent
, const char *sep
, const char *term
,
3864 const char *type
, const char *name
)
3866 /* The ultrix fprintf returns 0 on success, so compute the result we want
3867 here since we need it for the following test. */
3868 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
3873 fprintf (file
, "%s", term
);
3878 fprintf (file
, "%s", indent
);
3879 pos
= strlen (indent
);
3881 fprintf (file
, "%s%s%s", sep
, type
, name
);
3886 /* Print active target switches to FILE.
3887 POS is the current cursor position and MAX is the size of a "line".
3888 Each line begins with INDENT and ends with TERM.
3889 Each switch is separated from the next by SEP. */
3892 print_switch_values (FILE *file
, int pos
, int max
,
3893 const char *indent
, const char *sep
, const char *term
)
3898 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3899 that it can be printed below. This helps reproducibility. */
3902 /* Print the options as passed. */
3903 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
3904 _("options passed: "), "");
3906 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
3910 if (strcmp (*p
, "-o") == 0)
3916 if (strcmp (*p
, "-quiet") == 0)
3918 if (strcmp (*p
, "-version") == 0)
3923 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
3926 fprintf (file
, "%s", term
);
3928 /* Print the -f and -m options that have been enabled.
3929 We don't handle language specific options but printing argv
3932 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
3933 _("options enabled: "), "");
3935 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
3936 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
3937 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
3938 "-f", f_options
[j
].string
);
3940 /* Print target specific options. */
3942 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
3943 if (target_switches
[j
].name
[0] != '\0'
3944 && target_switches
[j
].value
> 0
3945 && ((target_switches
[j
].value
& target_flags
)
3946 == target_switches
[j
].value
))
3948 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
3949 "-m", target_switches
[j
].name
);
3952 #ifdef TARGET_OPTIONS
3953 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
3954 if (*target_options
[j
].variable
!= NULL
)
3957 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
3958 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
3959 prefix
, *target_options
[j
].variable
);
3963 fprintf (file
, "%s", term
);
3966 /* Open assembly code output file. Do this even if -fsyntax-only is
3967 on, because then the driver will have provided the name of a
3968 temporary file or bit bucket for us. NAME is the file specified on
3969 the command line, possibly NULL. */
3971 init_asm_output (const char *name
)
3973 if (name
== NULL
&& asm_file_name
== 0)
3974 asm_out_file
= stdout
;
3977 if (asm_file_name
== 0)
3979 int len
= strlen (dump_base_name
);
3980 char *dumpname
= xmalloc (len
+ 6);
3981 memcpy (dumpname
, dump_base_name
, len
+ 1);
3982 strip_off_ending (dumpname
, len
);
3983 strcat (dumpname
, ".s");
3984 asm_file_name
= dumpname
;
3986 if (!strcmp (asm_file_name
, "-"))
3987 asm_out_file
= stdout
;
3989 asm_out_file
= fopen (asm_file_name
, "w+");
3990 if (asm_out_file
== 0)
3991 fatal_error ("can't open %s for writing: %m", asm_file_name
);
3994 #ifdef IO_BUFFER_SIZE
3995 setvbuf (asm_out_file
, xmalloc (IO_BUFFER_SIZE
),
3996 _IOFBF
, IO_BUFFER_SIZE
);
3999 if (!flag_syntax_only
)
4001 targetm
.asm_out
.file_start ();
4003 #ifdef ASM_COMMENT_START
4004 if (flag_verbose_asm
)
4006 /* Print the list of options in effect. */
4007 print_version (asm_out_file
, ASM_COMMENT_START
);
4008 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4009 ASM_COMMENT_START
, " ", "\n");
4010 /* Add a blank line here so it appears in assembler output but not
4012 fprintf (asm_out_file
, "\n");
4018 /* Default version of get_pch_validity.
4019 By default, every flag difference is fatal; that will be mostly right for
4020 most targets, but completely right for very few. */
4023 default_get_pch_validity (size_t *len
)
4025 #ifdef TARGET_OPTIONS
4030 *len
= sizeof (target_flags
) + 2;
4031 #ifdef TARGET_OPTIONS
4032 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
4035 if (*target_options
[i
].variable
)
4036 *len
+= strlen (*target_options
[i
].variable
);
4040 result
= r
= xmalloc (*len
);
4044 memcpy (r
, &target_flags
, sizeof (target_flags
));
4045 r
+= sizeof (target_flags
);
4047 #ifdef TARGET_OPTIONS
4048 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
4050 const char *str
= *target_options
[i
].variable
;
4054 l
= strlen (str
) + 1;
4063 /* Default version of pch_valid_p. */
4066 default_pch_valid_p (const void *data_p
, size_t len
)
4068 const char *data
= (const char *)data_p
;
4069 const char *flag_that_differs
= NULL
;
4072 /* -fpic and -fpie also usually make a PCH invalid. */
4073 if (data
[0] != flag_pic
)
4074 return _("created and used with different settings of -fpic");
4075 if (data
[1] != flag_pie
)
4076 return _("created and used with different settings of -fpie");
4079 /* Check target_flags. */
4080 if (memcmp (data
, &target_flags
, sizeof (target_flags
)) != 0)
4082 for (i
= 0; i
< ARRAY_SIZE (target_switches
); i
++)
4087 memcpy (&tf
, data
, sizeof (target_flags
));
4089 bits
= target_switches
[i
].value
;
4092 if ((target_flags
& bits
) != (tf
& bits
))
4094 flag_that_differs
= target_switches
[i
].name
;
4100 data
+= sizeof (target_flags
);
4101 len
-= sizeof (target_flags
);
4103 /* Check string options. */
4104 #ifdef TARGET_OPTIONS
4105 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
4107 const char *str
= *target_options
[i
].variable
;
4111 l
= strlen (str
) + 1;
4112 if (len
< l
|| memcmp (data
, str
, l
) != 0)
4114 flag_that_differs
= target_options
[i
].prefix
;
4127 asprintf (&r
, _("created and used with differing settings of `-m%s'"),
4130 return _("out of memory");
4135 /* Default tree printer. Handles declarations only. */
4137 default_tree_printer (pretty_printer
* pp
, text_info
*text
)
4139 switch (*text
->format_spec
)
4145 tree t
= va_arg (*text
->args_ptr
, tree
);
4146 const char *n
= DECL_NAME (t
)
4147 ? (*lang_hooks
.decl_printable_name
) (t
, 2)
4158 /* Initialization of the front end environment, before command line
4159 options are parsed. Signal handlers, internationalization etc.
4160 ARGV0 is main's argv[0]. */
4162 general_init (const char *argv0
)
4166 p
= argv0
+ strlen (argv0
);
4167 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4171 xmalloc_set_program_name (progname
);
4175 gcc_init_libintl ();
4177 /* Initialize the diagnostics reporting machinery, so option parsing
4178 can give warnings and errors. */
4179 diagnostic_initialize (global_dc
);
4180 /* Set a default printer. Language specific initializations will
4181 override it later. */
4182 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
4184 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4186 signal (SIGSEGV
, crash_signal
);
4189 signal (SIGILL
, crash_signal
);
4192 signal (SIGBUS
, crash_signal
);
4195 signal (SIGABRT
, crash_signal
);
4197 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4198 signal (SIGIOT
, crash_signal
);
4201 signal (SIGFPE
, crash_signal
);
4204 /* Other host-specific signal setup. */
4205 (*host_hooks
.extra_signals
)();
4207 /* Initialize the garbage-collector, string pools and tree type hash
4213 /* Initialize register usage now so switches may override. */
4216 /* Register the language-independent parameters. */
4217 add_params (lang_independent_params
, LAST_PARAM
);
4219 /* This must be done after add_params but before argument processing. */
4220 init_ggc_heuristics();
4223 /* Process the options that have been parsed. */
4225 process_options (void)
4227 /* Allow the front end to perform consistency checks and do further
4228 initialization based on the command line options. This hook also
4229 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4230 so we can correctly initialize debug output. */
4231 no_backend
= (*lang_hooks
.post_options
) (&main_input_filename
);
4232 input_filename
= main_input_filename
;
4234 #ifdef OVERRIDE_OPTIONS
4235 /* Some machines may reject certain combinations of options. */
4239 /* Set aux_base_name if not already set. */
4242 else if (main_input_filename
)
4244 char *name
= xstrdup (lbasename (main_input_filename
));
4246 strip_off_ending (name
, strlen (name
));
4247 aux_base_name
= name
;
4250 aux_base_name
= "gccaux";
4252 /* Set up the align_*_log variables, defaulting them to 1 if they
4253 were still unset. */
4254 if (align_loops
<= 0) align_loops
= 1;
4255 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4256 align_loops_max_skip
= align_loops
- 1;
4257 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4258 if (align_jumps
<= 0) align_jumps
= 1;
4259 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4260 align_jumps_max_skip
= align_jumps
- 1;
4261 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4262 if (align_labels
<= 0) align_labels
= 1;
4263 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4264 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4265 align_labels_max_skip
= align_labels
- 1;
4266 if (align_functions
<= 0) align_functions
= 1;
4267 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4269 /* Unrolling all loops implies that standard loop unrolling must also
4271 if (flag_unroll_all_loops
)
4272 flag_unroll_loops
= 1;
4274 if (flag_unroll_loops
)
4276 flag_old_unroll_loops
= 0;
4277 flag_old_unroll_all_loops
= 0;
4280 if (flag_old_unroll_all_loops
)
4281 flag_old_unroll_loops
= 1;
4283 /* Old loop unrolling requires that strength_reduction be on also. Silently
4284 turn on strength reduction here if it isn't already on. Also, the loop
4285 unrolling code assumes that cse will be run after loop, so that must
4286 be turned on also. */
4287 if (flag_old_unroll_loops
)
4289 flag_strength_reduce
= 1;
4290 flag_rerun_cse_after_loop
= 1;
4292 if (flag_unroll_loops
|| flag_peel_loops
)
4293 flag_rerun_cse_after_loop
= 1;
4295 if (flag_non_call_exceptions
)
4296 flag_asynchronous_unwind_tables
= 1;
4297 if (flag_asynchronous_unwind_tables
)
4298 flag_unwind_tables
= 1;
4300 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4302 if (flag_unit_at_a_time
&& ! lang_hooks
.callgraph
.expand_function
)
4303 flag_unit_at_a_time
= 0;
4305 if (flag_value_profile_transformations
)
4306 flag_profile_values
= 1;
4308 /* Warn about options that are not supported on this machine. */
4309 #ifndef INSN_SCHEDULING
4310 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4311 warning ("instruction scheduling not supported on this target machine");
4314 if (flag_delayed_branch
)
4315 warning ("this target machine does not have delayed branches");
4318 user_label_prefix
= USER_LABEL_PREFIX
;
4319 if (flag_leading_underscore
!= -1)
4321 /* If the default prefix is more complicated than "" or "_",
4322 issue a warning and ignore this option. */
4323 if (user_label_prefix
[0] == 0 ||
4324 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4326 user_label_prefix
= flag_leading_underscore
? "_" : "";
4329 warning ("-f%sleading-underscore not supported on this target machine",
4330 flag_leading_underscore
? "" : "no-");
4333 /* If we are in verbose mode, write out the version and maybe all the
4334 option flags in use. */
4337 print_version (stderr
, "");
4339 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4342 if (flag_syntax_only
)
4344 write_symbols
= NO_DEBUG
;
4348 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4350 if (debug_info_level
== DINFO_LEVEL_NONE
)
4351 write_symbols
= NO_DEBUG
;
4353 /* Now we know write_symbols, set up the debug hooks based on it.
4354 By default we do nothing for debug output. */
4355 if (write_symbols
== NO_DEBUG
)
4356 debug_hooks
= &do_nothing_debug_hooks
;
4357 #if defined(DBX_DEBUGGING_INFO)
4358 else if (write_symbols
== DBX_DEBUG
)
4359 debug_hooks
= &dbx_debug_hooks
;
4361 #if defined(XCOFF_DEBUGGING_INFO)
4362 else if (write_symbols
== XCOFF_DEBUG
)
4363 debug_hooks
= &xcoff_debug_hooks
;
4365 #ifdef SDB_DEBUGGING_INFO
4366 else if (write_symbols
== SDB_DEBUG
)
4367 debug_hooks
= &sdb_debug_hooks
;
4369 #ifdef DWARF2_DEBUGGING_INFO
4370 else if (write_symbols
== DWARF2_DEBUG
)
4371 debug_hooks
= &dwarf2_debug_hooks
;
4373 #ifdef VMS_DEBUGGING_INFO
4374 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4375 debug_hooks
= &vmsdbg_debug_hooks
;
4378 error ("target system does not support the \"%s\" debug format",
4379 debug_type_names
[write_symbols
]);
4381 /* If auxiliary info generation is desired, open the output file.
4382 This goes in the same directory as the source file--unlike
4383 all the other output files. */
4384 if (flag_gen_aux_info
)
4386 aux_info_file
= fopen (aux_info_file_name
, "w");
4387 if (aux_info_file
== 0)
4388 fatal_error ("can't open %s: %m", aux_info_file_name
);
4391 if (! targetm
.have_named_sections
)
4393 if (flag_function_sections
)
4395 warning ("-ffunction-sections not supported for this target");
4396 flag_function_sections
= 0;
4398 if (flag_data_sections
)
4400 warning ("-fdata-sections not supported for this target");
4401 flag_data_sections
= 0;
4405 if (flag_function_sections
&& profile_flag
)
4407 warning ("-ffunction-sections disabled; it makes profiling impossible");
4408 flag_function_sections
= 0;
4411 #ifndef HAVE_prefetch
4412 if (flag_prefetch_loop_arrays
)
4414 warning ("-fprefetch-loop-arrays not supported for this target");
4415 flag_prefetch_loop_arrays
= 0;
4418 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
4420 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4421 flag_prefetch_loop_arrays
= 0;
4425 /* This combination of options isn't handled for i386 targets and doesn't
4426 make much sense anyway, so don't allow it. */
4427 if (flag_prefetch_loop_arrays
&& optimize_size
)
4429 warning ("-fprefetch-loop-arrays is not supported with -Os");
4430 flag_prefetch_loop_arrays
= 0;
4433 #ifndef OBJECT_FORMAT_ELF
4434 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
4435 warning ("-ffunction-sections may affect debugging on some targets");
4438 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4439 if (flag_signaling_nans
)
4440 flag_trapping_math
= 1;
4443 /* Initialize the compiler back end. */
4447 init_adjust_machine_modes ();
4449 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
4450 || debug_info_level
== DINFO_LEVEL_VERBOSE
4451 #ifdef VMS_DEBUGGING_INFO
4452 /* Enable line number info for traceback. */
4453 || debug_info_level
> DINFO_LEVEL_NONE
4455 || flag_test_coverage
4456 || warn_notreached
);
4459 init_fake_stack_mems ();
4463 init_function_once ();
4464 init_varasm_once ();
4466 /* The following initialization functions need to generate rtl, so
4467 provide a dummy function context for them. */
4468 init_dummy_function_start ();
4470 if (flag_caller_saves
)
4471 init_caller_save ();
4472 expand_dummy_function_end ();
4475 /* Language-dependent initialization. Returns nonzero on success. */
4477 lang_dependent_init (const char *name
)
4479 if (dump_base_name
== 0)
4480 dump_base_name
= name
? name
: "gccdump";
4482 /* Other front-end initialization. */
4483 if ((*lang_hooks
.init
) () == 0)
4486 init_asm_output (name
);
4488 /* These create various _DECL nodes, so need to be called after the
4489 front end is initialized. */
4493 /* The following initialization functions need to generate rtl, so
4494 provide a dummy function context for them. */
4495 init_dummy_function_start ();
4497 expand_dummy_function_end ();
4499 /* If dbx symbol table desired, initialize writing it and output the
4500 predefined types. */
4501 timevar_push (TV_SYMOUT
);
4503 #ifdef DWARF2_UNWIND_INFO
4504 if (dwarf2out_do_frame ())
4505 dwarf2out_frame_init ();
4508 /* Now we have the correct original filename, we can initialize
4510 (*debug_hooks
->init
) (name
);
4512 timevar_pop (TV_SYMOUT
);
4517 /* Clean up: close opened files, etc. */
4522 /* Close the dump files. */
4523 if (flag_gen_aux_info
)
4525 fclose (aux_info_file
);
4527 unlink (aux_info_file_name
);
4530 /* Close non-debugging input and output files. Take special care to note
4531 whether fclose returns an error, since the pages might still be on the
4532 buffer chain while the file is open. */
4536 if (ferror (asm_out_file
) != 0)
4537 fatal_error ("error writing to %s: %m", asm_file_name
);
4538 if (fclose (asm_out_file
) != 0)
4539 fatal_error ("error closing %s: %m", asm_file_name
);
4542 /* Do whatever is necessary to finish printing the graphs. */
4543 if (graph_dump_format
!= no_graph
)
4547 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4548 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
4553 sprintf (seq
, DUMPFILE_FORMAT
, i
);
4554 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
4555 finish_graph_dump_file (dump_base_name
, suffix
);
4562 ggc_print_statistics ();
4563 stringpool_statistics ();
4564 dump_tree_statistics ();
4565 dump_rtx_statistics ();
4568 /* Free up memory for the benefit of leak detectors. */
4571 /* Language-specific end of compilation actions. */
4572 (*lang_hooks
.finish
) ();
4575 /* Initialize the compiler, and compile the input file. */
4579 /* Initialize timing first. The C front ends read the main file in
4580 the post_options hook, and C++ does file timings. */
4581 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
4583 timevar_start (TV_TOTAL
);
4587 /* Don't do any more if an error has already occurred. */
4590 /* Set up the back-end if requested. */
4594 /* Language-dependent initialization. Returns true on success. */
4595 if (lang_dependent_init (main_input_filename
))
4597 if (flag_unit_at_a_time
)
4599 open_dump_file (DFI_cgraph
, NULL
);
4600 cgraph_dump_file
= rtl_dump_file
;
4601 rtl_dump_file
= NULL
;
4606 if (flag_unit_at_a_time
)
4608 rtl_dump_file
= cgraph_dump_file
;
4609 cgraph_dump_file
= NULL
;
4610 close_dump_file (DFI_cgraph
, NULL
, NULL_RTX
);
4617 /* Stop timing and print the times. */
4618 timevar_stop (TV_TOTAL
);
4619 timevar_print (stderr
);
4622 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4623 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4624 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4626 It is not safe to call this function more than once. */
4629 toplev_main (unsigned int argc
, const char **argv
)
4633 /* Initialization of GCC's environment, and diagnostics. */
4634 general_init (argv
[0]);
4636 /* Parse the options and do minimal processing; basically just
4637 enough to default flags appropriately. */
4638 decode_options (argc
, argv
);
4642 /* Exit early if we can (e.g. -help). */
4643 if (!exit_after_options
)
4646 if (errorcount
|| sorrycount
)
4647 return (FATAL_EXIT_CODE
);
4649 return (SUCCESS_EXIT_CODE
);