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
24 /* This is the top level of cc1/c++.
25 It parses command args, opens files, invokes the various passes
26 in the proper order, and counts the time used by each.
27 Error messages and low-level interface to malloc also handled here. */
30 #undef FLOAT /* This is for hpux. They should change hpux. */
31 #undef FFS /* Some systems define this in param.h. */
33 #include "coretypes.h"
37 #ifdef HAVE_SYS_RESOURCE_H
38 # include <sys/resource.h>
41 #ifdef HAVE_SYS_TIMES_H
42 # include <sys/times.h>
50 #include "insn-attr.h"
51 #include "insn-config.h"
52 #include "insn-flags.h"
53 #include "hard-reg-set.h"
60 #include "basic-block.h"
67 #include "diagnostic.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
78 #include "hosthooks.h"
82 #include "value-prof.h"
83 #include "alloc-pool.h"
85 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
86 #include "dwarf2out.h"
89 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
93 #ifdef SDB_DEBUGGING_INFO
97 #ifdef XCOFF_DEBUGGING_INFO
98 #include "xcoffout.h" /* Needed for external data
99 declarations for e.g. AIX 4.x. */
102 #ifndef HAVE_conditional_execution
103 #define HAVE_conditional_execution 0
106 /* Carry information from ASM_DECLARE_OBJECT_NAME
107 to ASM_FINISH_DECLARE_OBJECT. */
109 extern int size_directive_output;
110 extern tree last_assemble_variable_decl;
112 extern void reg_alloc (void);
114 static void general_init (const char *);
115 static void do_compile (void);
116 static void process_options (void);
117 static void backend_init (void);
118 static int lang_dependent_init (const char *);
119 static void init_asm_output (const char *);
120 static void finalize (void);
122 static void crash_signal (int) ATTRIBUTE_NORETURN;
123 static void setup_core_dumping (void);
124 static void compile_file (void);
126 static int print_single_switch (FILE *, int, int, const char *,
127 const char *, const char *,
128 const char *, const char *);
129 static void print_switch_values (FILE *, int, int, const char *,
130 const char *, const char *);
132 /* Rest of compilation helper functions. */
133 static bool rest_of_handle_inlining (tree);
134 static void rest_of_handle_cse (tree, rtx);
135 static void rest_of_handle_cse2 (tree, rtx);
136 static void rest_of_handle_gcse (tree, rtx);
137 static void rest_of_handle_life (tree, rtx);
138 static void rest_of_handle_loop_optimize (tree, rtx);
139 static void rest_of_handle_loop2 (tree, rtx);
140 static void rest_of_handle_jump_bypass (tree, rtx);
141 static void rest_of_handle_sibling_calls (rtx);
142 static void rest_of_handle_null_pointer (tree, rtx);
143 static void rest_of_handle_addressof (tree, rtx);
144 static void rest_of_handle_cfg (tree, rtx);
145 static void rest_of_handle_branch_prob (tree, rtx);
146 static void rest_of_handle_value_profile_transformations (tree, rtx);
147 static void rest_of_handle_if_conversion (tree, rtx);
148 static void rest_of_handle_if_after_combine (tree, rtx);
149 static void rest_of_handle_tracer (tree, rtx);
150 static void rest_of_handle_combine (tree, rtx);
151 static void rest_of_handle_regmove (tree, rtx);
152 #ifdef INSN_SCHEDULING
153 static void rest_of_handle_sched (tree, rtx);
154 static void rest_of_handle_sched2 (tree, rtx);
156 static bool rest_of_handle_new_regalloc (tree, rtx);
157 static bool rest_of_handle_old_regalloc (tree, rtx);
158 static void rest_of_handle_regrename (tree, rtx);
159 static void rest_of_handle_reorder_blocks (tree, rtx);
161 static void rest_of_handle_stack_regs (tree, rtx);
163 static void rest_of_handle_machine_reorg (tree, rtx);
165 static void rest_of_handle_delay_slots (tree, rtx);
167 static void rest_of_handle_final (tree, rtx);
169 /* Nonzero to dump debug info whilst parsing (-dy option). */
170 static int set_yydebug;
172 /* True if we don't need a backend (e.g. preprocessing only). */
173 static bool no_backend;
175 /* Length of line when printing switch values. */
178 /* Name of program invoked, sans directories. */
180 const char *progname;
182 /* Copy of argument vector to toplev_main. */
183 static const char **save_argv;
185 /* Name of top-level original source file (what was input to cpp).
186 This comes from the #-command at the beginning of the actual input.
187 If there isn't any there, then this is the cc1 input file name. */
189 const char *main_input_filename;
191 /* Current position in real source file. */
193 location_t input_location;
195 /* Nonzero if it is unsafe to create any new pseudo registers. */
198 /* Stack of currently pending input files. */
200 struct file_stack *input_file_stack;
202 /* Incremented on each change to input_file_stack. */
203 int input_file_stack_tick;
205 /* Name to use as base of names for dump output files. */
207 const char *dump_base_name;
209 /* Name to use as a base for auxiliary output files. */
211 const char *aux_base_name;
213 /* Format to use to print dumpfile index value */
214 #ifndef DUMPFILE_FORMAT
215 #define DUMPFILE_FORMAT ".%02d."
218 /* Bit flags that specify the machine subtype we are compiling for.
219 Bits are tested using macros TARGET_... defined in the tm.h file
220 and set by `-m...' switches. Must be defined in rtlanal.c. */
222 extern int target_flags;
224 /* A mask of target_flags that includes bit X if X was set or cleared
225 on the command line. */
227 int target_flags_explicit;
229 /* Debug hooks - dependent upon command line options. */
231 const struct gcc_debug_hooks *debug_hooks;
233 /* Describes a dump file. */
235 struct dump_file_info
237 /* The unique extension to apply, e.g. ".jump". */
238 const char *const extension;
240 /* The -d<c> character that enables this dump file. */
241 char const debug_switch;
243 /* True if there is a corresponding graph dump file. */
244 char const graph_dump_p;
246 /* True if the user selected this dump. */
249 /* True if the files have been initialized (ie truncated). */
253 /* Enumerate the extant dump files. */
289 DFI_branch_target_load,
297 /* Describes all the dump files. Should be kept in order of the
298 pass and in sync with dump_file_index above.
300 Remaining -d letters:
306 static struct dump_file_info dump_file[DFI_MAX] =
308 { "cgraph", 'U', 0, 0, 0 },
309 { "rtl", 'r', 0, 0, 0 },
310 { "sibling", 'i', 0, 0, 0 },
311 { "eh", 'h', 0, 0, 0 },
312 { "jump", 'j', 0, 0, 0 },
313 { "null", 'u', 0, 0, 0 },
314 { "cse", 's', 0, 0, 0 },
315 { "addressof", 'F', 0, 0, 0 },
316 { "gcse", 'G', 1, 0, 0 },
317 { "loop", 'L', 1, 0, 0 },
318 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
319 { "cfg", 'f', 1, 0, 0 },
320 { "bp", 'b', 1, 0, 0 },
321 { "vpt", 'V', 1, 0, 0 },
322 { "ce1", 'C', 1, 0, 0 },
323 { "tracer", 'T', 1, 0, 0 },
324 { "loop2", 'L', 1, 0, 0 },
325 { "web", 'Z', 0, 0, 0 },
326 { "cse2", 't', 1, 0, 0 },
327 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
328 { "combine", 'c', 1, 0, 0 },
329 { "ce2", 'C', 1, 0, 0 },
330 { "regmove", 'N', 1, 0, 0 },
331 { "sched", 'S', 1, 0, 0 },
332 { "lreg", 'l', 1, 0, 0 },
333 { "greg", 'g', 1, 0, 0 },
334 { "postreload", 'o', 1, 0, 0 },
335 { "flow2", 'w', 1, 0, 0 },
336 { "peephole2", 'z', 1, 0, 0 },
337 { "ce3", 'E', 1, 0, 0 },
338 { "rnreg", 'n', 1, 0, 0 },
339 { "bbro", 'B', 1, 0, 0 },
340 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
341 { "sched2", 'R', 1, 0, 0 },
342 { "stack", 'k', 1, 0, 0 },
343 { "mach", 'M', 1, 0, 0 },
344 { "dbr", 'd', 0, 0, 0 },
347 static int open_dump_file (enum dump_file_index, tree);
348 static void close_dump_file (enum dump_file_index,
349 void (*) (FILE *, rtx), rtx);
351 /* Other flags saying which kinds of debugging dump have been requested. */
353 int rtl_dump_and_exit;
354 int flag_print_asm_name;
355 enum graph_dump_types graph_dump_format;
357 /* Name for output file of assembly code, specified with -o. */
359 const char *asm_file_name;
361 /* Nonzero means do optimizations. -O.
362 Particular numeric values stand for particular amounts of optimization;
363 thus, -O2 stores 2 here. However, the optimizations beyond the basic
364 ones are not controlled directly by this variable. Instead, they are
365 controlled by individual `flag_...' variables that are defaulted
366 based on this variable. */
370 /* Nonzero means optimize for size. -Os.
371 The only valid values are zero and nonzero. When optimize_size is
372 nonzero, optimize defaults to 2, but certain individual code
373 bloating optimizations are disabled. */
375 int optimize_size = 0;
377 /* The FUNCTION_DECL for the function currently being compiled,
378 or 0 if between functions. */
379 tree current_function_decl;
381 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
383 tree current_function_func_begin_label;
385 /* Nonzero if doing dwarf2 duplicate elimination. */
387 int flag_eliminate_dwarf2_dups = 0;
389 /* Nonzero if doing unused type elimination. */
391 int flag_eliminate_unused_debug_types = 1;
393 /* Nonzero means emit debugging information only for symbols which are used. */
394 int flag_debug_only_used_symbols = 0;
396 /* Nonzero if generating code to do profiling. */
398 int profile_flag = 0;
400 /* Nonzero if generating code to profile program flow graph arcs. */
402 int profile_arc_flag = 0;
404 /* Nonzero if value histograms should be measured. */
406 int flag_profile_values = 0;
408 /* Nonzero if value histograms should be used to optimize code. */
409 int flag_value_profile_transformations = 0;
411 /* Nonzero if generating info for gcov to calculate line test coverage. */
413 int flag_test_coverage = 0;
415 /* Nonzero indicates that branch taken probabilities should be calculated. */
417 int flag_branch_probabilities = 0;
419 /* Nonzero if basic blocks should be reordered. */
421 int flag_reorder_blocks = 0;
423 /* Nonzero if functions should be reordered. */
425 int flag_reorder_functions = 0;
427 /* Nonzero if registers should be renamed. */
429 int flag_rename_registers = 0;
430 int flag_cprop_registers = 0;
432 /* Nonzero for -pedantic switch: warn about anything
433 that standard spec forbids. */
437 /* Temporarily suppress certain warnings.
438 This is set while reading code from a system header file. */
440 int in_system_header = 0;
442 /* Don't print functions as they are compiled. -quiet. */
446 /* Print times taken by the various passes. -ftime-report. */
450 /* Print memory still in use at end of compilation (which may have little
451 to do with peak memory consumption). -fmem-report. */
455 /* Nonzero means to collect statistics which might be expensive
456 and to print them when we are done. */
457 int flag_detailed_statistics = 0;
459 /* A random sequence of characters, unless overridden by user. */
460 const char *flag_random_seed;
462 /* A local time stamp derived from the time of compilation. It will be
463 zero if the system cannot provide a time. It will be -1u, if the
464 user has specified a particular random seed. */
469 /* Nonzero means `char' should be signed. */
471 int flag_signed_char;
473 /* Nonzero means give an enum type only as many bytes as it needs. */
475 int flag_short_enums;
477 /* Nonzero for -fcaller-saves: allocate values in regs that need to
478 be saved across function calls, if that produces overall better code.
479 Optional now, so people can test it. */
481 int flag_caller_saves = 0;
483 /* Nonzero if structures and unions should be returned in memory.
485 This should only be defined if compatibility with another compiler or
486 with an ABI is needed, because it results in slower code. */
488 #ifndef DEFAULT_PCC_STRUCT_RETURN
489 #define DEFAULT_PCC_STRUCT_RETURN 1
492 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
494 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
496 /* Nonzero for -fforce-mem: load memory value into a register
497 before arithmetic on it. This makes better cse but slower compilation. */
499 int flag_force_mem = 0;
501 /* Nonzero for -fforce-addr: load memory address into a register before
502 reference to memory. This makes better cse but slower compilation. */
504 int flag_force_addr = 0;
506 /* Nonzero for -fdefer-pop: don't pop args after each function call;
507 instead save them up to pop many calls' args with one insns. */
509 int flag_defer_pop = 0;
511 /* Nonzero for -ffloat-store: don't allocate floats and doubles
512 in extended-precision registers. */
514 int flag_float_store = 0;
516 /* Nonzero for -fcse-follow-jumps:
517 have cse follow jumps to do a more extensive job. */
519 int flag_cse_follow_jumps;
521 /* Nonzero for -fcse-skip-blocks:
522 have cse follow a branch around a block. */
523 int flag_cse_skip_blocks;
525 /* Nonzero for -fexpensive-optimizations:
526 perform miscellaneous relatively-expensive optimizations. */
527 int flag_expensive_optimizations;
529 /* Nonzero for -fthread-jumps:
530 have jump optimize output of loop. */
532 int flag_thread_jumps;
534 /* Nonzero enables strength-reduction in loop.c. */
536 int flag_strength_reduce = 0;
538 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
539 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
540 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
543 int flag_old_unroll_loops;
545 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
546 This is generally not a win. */
548 int flag_old_unroll_all_loops;
550 /* Enables unrolling of simple loops in loop-unroll.c. */
551 int flag_unroll_loops;
553 /* Enables unrolling of all loops in loop-unroll.c. */
554 int flag_unroll_all_loops;
556 /* Nonzero enables loop peeling. */
559 /* Nonzero enables loop unswitching. */
560 int flag_unswitch_loops;
562 /* Nonzero enables prefetch optimizations for arrays in loops. */
564 int flag_prefetch_loop_arrays;
566 /* Nonzero forces all invariant computations in loops to be moved
569 int flag_move_all_movables = 0;
571 /* Nonzero forces all general induction variables in loops to be
574 int flag_reduce_all_givs = 0;
576 /* Nonzero to perform full register move optimization passes. This is the
579 int flag_regmove = 0;
581 /* Nonzero for -fwritable-strings:
582 store string constants in data segment and don't uniquize them. */
584 int flag_writable_strings = 0;
586 /* Nonzero means don't put addresses of constant functions in registers.
587 Used for compiling the Unix kernel, where strange substitutions are
588 done on the assembly output. */
590 int flag_no_function_cse = 0;
592 /* Nonzero for -fomit-frame-pointer:
593 don't make a frame pointer in simple functions that don't require one. */
595 int flag_omit_frame_pointer = 0;
597 /* Nonzero means place each function into its own section on those platforms
598 which support arbitrary section names and unlimited numbers of sections. */
600 int flag_function_sections = 0;
602 /* ... and similar for data. */
604 int flag_data_sections = 0;
606 /* Nonzero to inhibit use of define_optimization peephole opts. */
608 int flag_no_peephole = 0;
610 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
612 int flag_optimize_sibling_calls = 0;
614 /* Nonzero means the front end generally wants `errno' maintained by math
615 operations, like built-in SQRT. */
617 int flag_errno_math = 1;
619 /* Nonzero means that unsafe floating-point math optimizations are allowed
620 for the sake of speed. IEEE compliance is not guaranteed, and operations
621 are allowed to assume that their arguments and results are "normal"
622 (e.g., nonnegative for SQRT). */
624 int flag_unsafe_math_optimizations = 0;
626 /* Nonzero means that no NaNs or +-Infs are expected. */
628 int flag_finite_math_only = 0;
630 /* Zero means that floating-point math operations cannot generate a
631 (user-visible) trap. This is the case, for example, in nonstop
632 IEEE 754 arithmetic. Trapping conditions include division by zero,
633 overflow, underflow, invalid and inexact, but does not include
634 operations on signaling NaNs (see below). */
636 int flag_trapping_math = 1;
638 /* Nonzero means disable transformations that assume default floating
639 point rounding behavior. */
641 int flag_rounding_math = 0;
643 /* Nonzero means disable transformations observable by signaling NaNs.
644 This option implies that any operation on an IEEE signaling NaN can
645 generate a (user-visible) trap. */
647 int flag_signaling_nans = 0;
649 /* 0 means straightforward implementation of complex divide acceptable.
650 1 means wide ranges of inputs must work for complex divide.
651 2 means C99-like requirements for complex divide (not yet implemented). */
653 int flag_complex_divide_method = 0;
655 /* Nonzero means just do syntax checking; don't output anything. */
657 int flag_syntax_only = 0;
659 /* Nonzero means performs web construction pass. */
663 /* Nonzero means perform loop optimizer. */
665 int flag_loop_optimize;
667 /* Nonzero means perform crossjumping. */
669 int flag_crossjumping;
671 /* Nonzero means perform if conversion. */
673 int flag_if_conversion;
675 /* Nonzero means perform if conversion after reload. */
677 int flag_if_conversion2;
679 /* Nonzero means to use global dataflow analysis to eliminate
680 useless null pointer tests. */
682 int flag_delete_null_pointer_checks;
684 /* Nonzero means perform global CSE. */
688 /* Nonzero means to do the enhanced load motion during gcse, which trys
689 to hoist loads by not killing them when a store to the same location
692 int flag_gcse_lm = 1;
694 /* Nonzero means to perform store motion after gcse, which will try to
695 move stores closer to the exit block. Its not very effective without
698 int flag_gcse_sm = 1;
700 /* Nonzero if we want to perfrom redundant load after store elimination
703 int flag_gcse_las = 1;
705 /* Perform target register optimization before prologue / epilogue
708 int flag_branch_target_load_optimize = 0;
710 /* Perform target register optimization after prologue / epilogue
711 threading and jump2. */
713 int flag_branch_target_load_optimize2 = 0;
715 /* Nonzero means to rerun cse after loop optimization. This increases
716 compilation time about 20% and picks up a few more common expressions. */
718 int flag_rerun_cse_after_loop;
720 /* Nonzero means to run loop optimizations twice. */
722 int flag_rerun_loop_opt;
724 /* Nonzero for -finline-functions: ok to inline functions that look like
725 good inline candidates. */
727 int flag_inline_functions;
729 /* Nonzero for -fkeep-inline-functions: even if we make a function
730 go inline everywhere, keep its definition around for debugging
733 int flag_keep_inline_functions;
735 /* Nonzero means that functions will not be inlined. */
737 int flag_no_inline = 2;
739 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
740 not just because the tree inliner turned us off. */
742 int flag_really_no_inline = 2;
744 /* Nonzero means that we should emit static const variables
745 regardless of whether or not optimization is turned on. */
747 int flag_keep_static_consts = 1;
749 /* Nonzero means we should be saving declaration info into a .X file. */
751 int flag_gen_aux_info = 0;
753 /* Specified name of aux-info file. */
755 const char *aux_info_file_name;
757 /* Nonzero means make the text shared if supported. */
759 int flag_shared_data;
761 /* Nonzero means schedule into delayed branch slots if supported. */
763 int flag_delayed_branch;
765 /* Nonzero if we are compiling pure (sharable) code.
766 Value is 1 if we are doing "small" pic; value is 2 if we're doing
771 /* Nonzero if we are compiling position independent code for executable.
772 The value is 1 if we are doing "small" pic; value is 2 if we're doing
777 /* Nonzero if we are compiling code for a shared library, zero for
782 /* Set to the default thread-local storage (tls) model to use. */
784 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
786 /* Nonzero means generate extra code for exception handling and enable
787 exception handling. */
791 /* Nonzero means generate frame unwind info table when supported. */
793 int flag_unwind_tables = 0;
795 /* Nonzero means generate frame unwind info table exact at each insn
798 int flag_asynchronous_unwind_tables = 0;
800 /* Nonzero means don't place uninitialized global data in common storage
805 /* Nonzero means change certain warnings into errors.
806 Usually these are warnings about failure to conform to some standard. */
808 int flag_pedantic_errors = 0;
810 /* flag_schedule_insns means schedule insns within basic blocks (before
812 flag_schedule_insns_after_reload means schedule insns after
815 int flag_schedule_insns = 0;
816 int flag_schedule_insns_after_reload = 0;
818 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
819 int flag_sched2_use_superblocks = 0;
821 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
823 int flag_sched2_use_traces = 0;
825 /* The following flags have effect only for scheduling before register
828 flag_schedule_interblock means schedule insns across basic blocks.
829 flag_schedule_speculative means allow speculative motion of non-load insns.
830 flag_schedule_speculative_load means allow speculative motion of some
832 flag_schedule_speculative_load_dangerous allows speculative motion of more
835 int flag_schedule_interblock = 1;
836 int flag_schedule_speculative = 1;
837 int flag_schedule_speculative_load = 0;
838 int flag_schedule_speculative_load_dangerous = 0;
840 /* The following flags have an effect during scheduling after register
843 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
844 of stalled insns into the ready list.
846 flag_sched_stalled_insns_dep controls how many insn groups will be examined
847 for a dependency on a stalled insn that is candidate for premature removal
848 from the queue of stalled insns into the ready list (has an effect only if
849 the flag 'sched_stalled_insns' is set). */
851 int flag_sched_stalled_insns = 0;
852 int flag_sched_stalled_insns_dep = 1;
854 int flag_single_precision_constant;
856 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
857 by a cheaper branch on a count register. */
858 int flag_branch_on_count_reg = 1;
860 /* -finhibit-size-directive inhibits output of .size for ELF.
861 This is used only for compiling crtstuff.c,
862 and it may be extended to other effects
863 needed for crtstuff.c on other systems. */
864 int flag_inhibit_size_directive = 0;
866 /* -fverbose-asm causes extra commentary information to be produced in
867 the generated assembly code (to make it more readable). This option
868 is generally only of use to those who actually need to read the
869 generated assembly code (perhaps while debugging the compiler itself).
870 -fno-verbose-asm, the default, causes the extra information
871 to be omitted and is useful when comparing two assembler files. */
873 int flag_verbose_asm = 0;
875 /* -dA causes debug commentary information to be produced in
876 the generated assembly code (to make it more readable). This option
877 is generally only of use to those who actually need to read the
878 generated assembly code (perhaps while debugging the compiler itself).
879 Currently, this switch is only used by dwarfout.c; however, it is intended
880 to be a catchall for printing debug information in the assembler file. */
882 int flag_debug_asm = 0;
884 /* -dP causes the rtl to be emitted as a comment in assembly. */
886 int flag_dump_rtl_in_asm = 0;
888 /* Nonzero means put zero initialized data in the bss section. */
889 int flag_zero_initialized_in_bss = 1;
891 /* Tag all structures with __attribute__(packed). */
892 int flag_pack_struct = 0;
894 /* Nonzero means that -Wformat accepts certain system-dependent formats. */
895 int flag_format_extensions = 0;
897 /* Emit code to check for stack overflow; also may cause large objects
898 to be allocated dynamically. */
899 int flag_stack_check;
901 /* When non-NULL, indicates that whenever space is allocated on the
902 stack, the resulting stack pointer must not pass this
903 address---that is, for stacks that grow downward, the stack pointer
904 must always be greater than or equal to this address; for stacks
905 that grow upward, the stack pointer must be less than this address.
906 At present, the rtx may be either a REG or a SYMBOL_REF, although
907 the support provided depends on the backend. */
910 /* 0 if pointer arguments may alias each other. True in C.
911 1 if pointer arguments may not alias each other but may alias
913 2 if pointer arguments may not alias each other and may not
914 alias global variables. True in Fortran.
915 This defaults to 0 for C. */
916 int flag_argument_noalias = 0;
918 /* Nonzero if we should do (language-dependent) alias analysis.
919 Typically, this analysis will assume that expressions of certain
920 types do not alias expressions of certain other types. Only used
921 if alias analysis (in general) is enabled. */
922 int flag_strict_aliasing = 0;
924 /* Instrument functions with calls at entry and exit, for profiling. */
925 int flag_instrument_function_entry_exit = 0;
927 /* Nonzero means ignore `#ident' directives. 0 means handle them.
928 On SVR4 targets, it also controls whether or not to emit a
929 string identifying the compiler. */
931 int flag_no_ident = 0;
933 /* This will perform a peephole pass before sched2. */
934 int flag_peephole2 = 0;
936 /* This will try to guess branch probabilities. */
937 int flag_guess_branch_prob = 0;
939 /* -fcheck-bounds causes gcc to generate array bounds checks.
940 For C, C++, ObjC: defaults to off.
941 For Java: defaults to on.
942 For Fortran: defaults to off. */
943 int flag_bounds_check = 0;
945 /* This will attempt to merge constant section constants, if 1 only
946 string constants and constants from constant pool, if 2 also constant
948 int flag_merge_constants = 1;
950 /* If one, renumber instruction UIDs to reduce the number of
951 unused UIDs if there are a lot of instructions. If greater than
952 one, unconditionally renumber instruction UIDs. */
953 int flag_renumber_insns = 1;
955 /* If nonzero, use the graph coloring register allocator. */
956 int flag_new_regalloc = 0;
958 /* Nonzero if we perform superblock formation. */
962 /* Nonzero if we perform whole unit at a time compilation. */
964 int flag_unit_at_a_time = 0;
966 /* Values of the -falign-* flags: how much to align labels in code.
967 0 means `use default', 1 means `don't align'.
968 For each variable, there is an _log variant which is the power
969 of two not less than the variable, for .align output. */
973 int align_loops_max_skip;
976 int align_jumps_max_skip;
978 int align_labels_log;
979 int align_labels_max_skip;
981 int align_functions_log;
983 /* Like align_functions_log above, but used by front-ends to force the
984 minimum function alignment. Zero means no alignment is forced. */
985 int force_align_functions_log;
989 const char *const string;
993 lang_independent_options;
995 /* Nonzero if signed arithmetic overflow should trap. */
998 /* Nonzero if signed arithmetic overflow should wrap around. */
1001 /* Nonzero if subexpressions must be evaluated from left-to-right. */
1002 int flag_evaluation_order = 0;
1004 /* Add or remove a leading underscore from user symbols. */
1005 int flag_leading_underscore = -1;
1007 /* The version of the C++ ABI in use. The following values are
1010 0: The version of the ABI believed most conformant with the
1011 C++ ABI specification. This ABI may change as bugs are
1012 discovered and fixed. Therefore, 0 will not necessarily
1013 indicate the same ABI in different versions of G++.
1015 1: The version of the ABI first used in G++ 3.2.
1017 2: The version of the ABI first used in G++ 3.4.
1019 Additional positive integers will be assigned as new versions of
1020 the ABI become the default version of the ABI. */
1022 int flag_abi_version = 2;
1024 /* The user symbol prefix after having resolved same. */
1025 const char *user_label_prefix;
1027 static const param_info lang_independent_params[] = {
1028 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1029 { OPTION, DEFAULT, HELP },
1030 #include "params.def"
1035 /* Table of language-independent -f options.
1036 STRING is the option name. VARIABLE is the address of the variable.
1037 ON_VALUE is the value to store in VARIABLE
1038 if `-fSTRING' is seen as an option.
1039 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1041 static const lang_independent_options f_options[] =
1043 {"format-extensions", &flag_format_extensions, 1},
1044 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1045 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1046 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1047 {"float-store", &flag_float_store, 1 },
1048 {"defer-pop", &flag_defer_pop, 1 },
1049 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1050 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1051 {"tracer", &flag_tracer, 1 },
1052 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1053 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1054 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1055 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1056 {"thread-jumps", &flag_thread_jumps, 1 },
1057 {"strength-reduce", &flag_strength_reduce, 1 },
1058 {"unroll-loops", &flag_unroll_loops, 1 },
1059 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1060 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1061 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1062 {"peel-loops", &flag_peel_loops, 1 },
1063 {"unswitch-loops", &flag_unswitch_loops, 1 },
1064 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1065 {"move-all-movables", &flag_move_all_movables, 1 },
1066 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1067 {"writable-strings", &flag_writable_strings, 1 },
1068 {"peephole", &flag_no_peephole, 0 },
1069 {"force-mem", &flag_force_mem, 1 },
1070 {"force-addr", &flag_force_addr, 1 },
1071 {"function-cse", &flag_no_function_cse, 0 },
1072 {"inline-functions", &flag_inline_functions, 1 },
1073 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1074 {"inline", &flag_no_inline, 0 },
1075 {"keep-static-consts", &flag_keep_static_consts, 1 },
1076 {"syntax-only", &flag_syntax_only, 1 },
1077 {"shared-data", &flag_shared_data, 1 },
1078 {"caller-saves", &flag_caller_saves, 1 },
1079 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1080 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1081 {"delayed-branch", &flag_delayed_branch, 1 },
1082 {"web", &flag_web, 1},
1083 {"gcse", &flag_gcse, 1 },
1084 {"gcse-lm", &flag_gcse_lm, 1 },
1085 {"gcse-sm", &flag_gcse_sm, 1 },
1086 {"gcse-las", &flag_gcse_las, 1 },
1087 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1088 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1089 {"loop-optimize", &flag_loop_optimize, 1 },
1090 {"crossjumping", &flag_crossjumping, 1 },
1091 {"if-conversion", &flag_if_conversion, 1 },
1092 {"if-conversion2", &flag_if_conversion2, 1 },
1093 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1094 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1095 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1096 {"schedule-insns", &flag_schedule_insns, 1 },
1097 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1098 {"sched-interblock",&flag_schedule_interblock, 1 },
1099 {"sched-spec",&flag_schedule_speculative, 1 },
1100 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1101 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1102 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1103 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1104 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1105 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1106 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1107 {"pic", &flag_pic, 1 },
1108 {"PIC", &flag_pic, 2 },
1109 {"pie", &flag_pie, 1 },
1110 {"PIE", &flag_pie, 2 },
1111 {"exceptions", &flag_exceptions, 1 },
1112 {"unwind-tables", &flag_unwind_tables, 1 },
1113 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1114 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1115 {"profile-arcs", &profile_arc_flag, 1 },
1116 {"profile-values", &flag_profile_values, 1 },
1117 {"vpt", &flag_value_profile_transformations, 1 },
1118 {"test-coverage", &flag_test_coverage, 1 },
1119 {"branch-probabilities", &flag_branch_probabilities, 1 },
1120 {"profile", &profile_flag, 1 },
1121 {"reorder-blocks", &flag_reorder_blocks, 1 },
1122 {"reorder-functions", &flag_reorder_functions, 1 },
1123 {"rename-registers", &flag_rename_registers, 1 },
1124 {"cprop-registers", &flag_cprop_registers, 1 },
1125 {"common", &flag_no_common, 0 },
1126 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1127 {"function-sections", &flag_function_sections, 1 },
1128 {"data-sections", &flag_data_sections, 1 },
1129 {"verbose-asm", &flag_verbose_asm, 1 },
1130 {"regmove", &flag_regmove, 1 },
1131 {"optimize-register-move", &flag_regmove, 1 },
1132 {"pack-struct", &flag_pack_struct, 1 },
1133 {"stack-check", &flag_stack_check, 1 },
1134 {"argument-alias", &flag_argument_noalias, 0 },
1135 {"argument-noalias", &flag_argument_noalias, 1 },
1136 {"argument-noalias-global", &flag_argument_noalias, 2 },
1137 {"strict-aliasing", &flag_strict_aliasing, 1 },
1138 {"align-loops", &align_loops, 0 },
1139 {"align-jumps", &align_jumps, 0 },
1140 {"align-labels", &align_labels, 0 },
1141 {"align-functions", &align_functions, 0 },
1142 {"merge-constants", &flag_merge_constants, 1 },
1143 {"merge-all-constants", &flag_merge_constants, 2 },
1144 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1145 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1146 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1147 {"leading-underscore", &flag_leading_underscore, 1 },
1148 {"ident", &flag_no_ident, 0 },
1149 { "peephole2", &flag_peephole2, 1 },
1150 {"finite-math-only", &flag_finite_math_only, 1 },
1151 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1152 {"math-errno", &flag_errno_math, 1 },
1153 {"trapping-math", &flag_trapping_math, 1 },
1154 {"rounding-math", &flag_rounding_math, 1 },
1155 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1156 {"signaling-nans", &flag_signaling_nans, 1 },
1157 {"bounds-check", &flag_bounds_check, 1 },
1158 {"single-precision-constant", &flag_single_precision_constant, 1 },
1159 {"time-report", &time_report, 1 },
1160 {"mem-report", &mem_report, 1 },
1161 { "trapv", &flag_trapv, 1 },
1162 { "wrapv", &flag_wrapv, 1 },
1163 { "new-ra", &flag_new_regalloc, 1 }
1166 /* Here is a table, controlled by the tm.h file, listing each -m switch
1167 and which bits in `target_switches' it should set or clear.
1168 If VALUE is positive, it is bits to set.
1169 If VALUE is negative, -VALUE is bits to clear.
1170 (The sign bit is not used so there is no confusion.) */
1174 const char *const name;
1176 const char *const description;
1178 target_switches[] = TARGET_SWITCHES;
1180 /* This table is similar, but allows the switch to have a value. */
1182 #ifdef TARGET_OPTIONS
1185 const char *const prefix;
1186 const char **const variable;
1187 const char *const description;
1188 const char *const value;
1190 target_options[] = TARGET_OPTIONS;
1193 /* Nonzero means warn about function definitions that default the return type
1194 or that use a null return and have a return-type other than void. */
1196 int warn_return_type;
1198 /* Output files for assembler code (real compiler output)
1199 and debugging dumps. */
1202 FILE *aux_info_file;
1203 FILE *rtl_dump_file = NULL;
1204 FILE *cgraph_dump_file = NULL;
1206 /* The current working directory of a translation. It's generally the
1207 directory from which compilation was initiated, but a preprocessed
1208 file may specify the original directory in which it was
1211 static const char *src_pwd;
1213 /* Initialize src_pwd with the given string, and return true. If it
1214 was already initialized, return false. As a special case, it may
1215 be called with a NULL argument to test whether src_pwd has NOT been
1219 set_src_pwd (const char *pwd)
1224 src_pwd = xstrdup (pwd);
1228 /* Return the directory from which the translation unit was initiated,
1229 in case set_src_pwd() was not called before to assign it a
1236 src_pwd = getpwd ();
1241 /* Called when the start of a function definition is parsed,
1242 this function prints on stderr the name of the function. */
1244 announce_function (tree decl)
1248 if (rtl_dump_and_exit)
1249 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1251 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1253 pp_needs_newline (global_dc->printer) = true;
1254 diagnostic_set_last_function (global_dc);
1258 /* Set up a default flag_random_seed and local_tick, unless the user
1259 already specified one. */
1264 if (!flag_random_seed)
1266 unsigned HOST_WIDE_INT value;
1267 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1269 /* Get some more or less random data. */
1270 #ifdef HAVE_GETTIMEOFDAY
1274 gettimeofday (&tv, NULL);
1275 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1279 time_t now = time (NULL);
1281 if (now != (time_t)-1)
1282 local_tick = (unsigned) now;
1285 value = local_tick ^ getpid ();
1287 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1288 flag_random_seed = random_seed;
1290 else if (!local_tick)
1295 /* Decode the string P as an integral parameter.
1296 If the string is indeed an integer return its numeric value else
1297 issue an Invalid Option error for the option PNAME and return DEFVAL.
1298 If PNAME is zero just return DEFVAL, do not call error. */
1301 read_integral_parameter (const char *p, const char *pname, const int defval)
1303 const char *endp = p;
1307 if (ISDIGIT (*endp))
1316 error ("invalid option argument `%s'", pname);
1323 /* Return the logarithm of X, base 2, considering X unsigned,
1324 if X is a power of 2. Otherwise, returns -1.
1326 This should be used via the `exact_log2' macro. */
1329 exact_log2_wide (unsigned HOST_WIDE_INT x)
1332 /* Test for 0 or a power of 2. */
1333 if (x == 0 || x != (x & -x))
1335 while ((x >>= 1) != 0)
1340 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1341 If X is 0, return -1.
1343 This should be used via the floor_log2 macro. */
1346 floor_log2_wide (unsigned HOST_WIDE_INT x)
1355 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1356 into ICE messages, which is much more user friendly. In case the
1357 error printer crashes, reset the signal to prevent infinite recursion. */
1360 crash_signal (int signo)
1362 signal (signo, SIG_DFL);
1363 internal_error ("%s", strsignal (signo));
1366 /* Arrange to dump core on error. (The regular error message is still
1367 printed first, except in the case of abort().) */
1370 setup_core_dumping (void)
1373 signal (SIGABRT, SIG_DFL);
1375 #if defined(HAVE_SETRLIMIT)
1378 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1379 fatal_error ("getting core file size maximum limit: %m");
1380 rlim.rlim_cur = rlim.rlim_max;
1381 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1382 fatal_error ("setting core file size limit to maximum: %m");
1385 diagnostic_abort_on_error (global_dc);
1389 /* Strip off a legitimate source ending from the input string NAME of
1390 length LEN. Rather than having to know the names used by all of
1391 our front ends, we strip off an ending of a period followed by
1392 up to five characters. (Java uses ".class".) */
1395 strip_off_ending (char *name, int len)
1398 for (i = 2; i < 6 && len > i; i++)
1400 if (name[len - i] == '.')
1402 name[len - i] = '\0';
1408 /* Output a quoted string. */
1411 output_quoted_string (FILE *asm_file, const char *string)
1413 #ifdef OUTPUT_QUOTED_STRING
1414 OUTPUT_QUOTED_STRING (asm_file, string);
1418 putc ('\"', asm_file);
1419 while ((c = *string++) != 0)
1423 if (c == '\"' || c == '\\')
1424 putc ('\\', asm_file);
1428 fprintf (asm_file, "\\%03o", (unsigned char) c);
1430 putc ('\"', asm_file);
1434 /* Output a file name in the form wanted by System V. */
1437 output_file_directive (FILE *asm_file, const char *input_name)
1442 if (input_name == NULL)
1443 input_name = "<stdin>";
1445 len = strlen (input_name);
1446 na = input_name + len;
1448 /* NA gets INPUT_NAME sans directory names. */
1449 while (na > input_name)
1451 if (IS_DIR_SEPARATOR (na[-1]))
1456 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1457 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1459 fprintf (asm_file, "\t.file\t");
1460 output_quoted_string (asm_file, na);
1461 fputc ('\n', asm_file);
1465 /* Routine to open a dump file. Return true if the dump file is enabled. */
1468 open_dump_file (enum dump_file_index index, tree decl)
1471 const char *open_arg;
1474 if (! dump_file[index].enabled)
1477 timevar_push (TV_DUMP);
1478 if (rtl_dump_file != NULL)
1479 fclose (rtl_dump_file);
1481 sprintf (seq, DUMPFILE_FORMAT, index);
1483 if (! dump_file[index].initialized)
1485 /* If we've not initialized the files, do so now. */
1486 if (graph_dump_format != no_graph
1487 && dump_file[index].graph_dump_p)
1489 dump_name = concat (seq, dump_file[index].extension, NULL);
1490 clean_graph_dump_file (dump_base_name, dump_name);
1493 dump_file[index].initialized = 1;
1499 dump_name = concat (dump_base_name, seq,
1500 dump_file[index].extension, NULL);
1502 rtl_dump_file = fopen (dump_name, open_arg);
1503 if (rtl_dump_file == NULL)
1504 fatal_error ("can't open %s: %m", dump_name);
1509 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1510 (*lang_hooks.decl_printable_name) (decl, 2),
1511 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1513 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1514 ? " (unlikely executed)"
1517 timevar_pop (TV_DUMP);
1521 /* Routine to close a dump file. */
1524 close_dump_file (enum dump_file_index index,
1525 void (*func) (FILE *, rtx),
1528 if (! rtl_dump_file)
1531 timevar_push (TV_DUMP);
1533 && graph_dump_format != no_graph
1534 && dump_file[index].graph_dump_p)
1539 sprintf (seq, DUMPFILE_FORMAT, index);
1540 suffix = concat (seq, dump_file[index].extension, NULL);
1541 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1546 func (rtl_dump_file, insns);
1548 fflush (rtl_dump_file);
1549 fclose (rtl_dump_file);
1551 rtl_dump_file = NULL;
1552 timevar_pop (TV_DUMP);
1555 /* Do any final processing required for the declarations in VEC, of
1556 which there are LEN. We write out inline functions and variables
1557 that have been deferred until this point, but which are required.
1558 Returns nonzero if anything was put out. */
1561 wrapup_global_declarations (tree *vec, int len)
1566 int output_something = 0;
1568 for (i = 0; i < len; i++)
1572 /* We're not deferring this any longer. Assignment is
1573 conditional to avoid needlessly dirtying PCH pages. */
1574 if (DECL_DEFER_OUTPUT (decl) != 0)
1575 DECL_DEFER_OUTPUT (decl) = 0;
1577 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1578 (*lang_hooks.finish_incomplete_decl) (decl);
1581 /* Now emit any global variables or functions that we have been
1582 putting off. We need to loop in case one of the things emitted
1583 here references another one which comes earlier in the list. */
1587 for (i = 0; i < len; i++)
1591 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1594 /* Don't write out static consts, unless we still need them.
1596 We also keep static consts if not optimizing (for debugging),
1597 unless the user specified -fno-keep-static-consts.
1598 ??? They might be better written into the debug information.
1599 This is possible when using DWARF.
1601 A language processor that wants static constants to be always
1602 written out (even if it is not used) is responsible for
1603 calling rest_of_decl_compilation itself. E.g. the C front-end
1604 calls rest_of_decl_compilation from finish_decl.
1605 One motivation for this is that is conventional in some
1606 environments to write things like:
1607 static const char rcsid[] = "... version string ...";
1608 intending to force the string to be in the executable.
1610 A language processor that would prefer to have unneeded
1611 static constants "optimized away" would just defer writing
1612 them out until here. E.g. C++ does this, because static
1613 constants are often defined in header files.
1615 ??? A tempting alternative (for both C and C++) would be
1616 to force a constant to be written if and only if it is
1617 defined in a main file, as opposed to an include file. */
1619 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1623 if (flag_unit_at_a_time
1624 && cgraph_varpool_node (decl)->finalized)
1626 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1627 && (TREE_USED (decl)
1628 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1630 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1632 else if (DECL_COMDAT (decl))
1634 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1635 && (optimize || !flag_keep_static_consts
1636 || DECL_ARTIFICIAL (decl)))
1642 rest_of_decl_compilation (decl, NULL, 1, 1);
1646 if (TREE_CODE (decl) == FUNCTION_DECL
1647 && DECL_INITIAL (decl) != 0
1648 && DECL_SAVED_INSNS (decl) != 0
1649 && DECL_SAVED_INSNS (decl)->saved_for_inline
1650 && (flag_keep_inline_functions
1651 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1652 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1655 output_inline_function (decl);
1660 output_something = 1;
1664 return output_something;
1667 /* Issue appropriate warnings for the global declarations in VEC (of
1668 which there are LEN). Output debugging information for them. */
1671 check_global_declarations (tree *vec, int len)
1676 for (i = 0; i < len; i++)
1680 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1681 && ! TREE_ASM_WRITTEN (decl))
1682 /* Cancel the RTL for this decl so that, if debugging info
1683 output for global variables is still to come,
1684 this one will be omitted. */
1685 SET_DECL_RTL (decl, NULL_RTX);
1687 /* Warn about any function
1688 declared static but not defined.
1689 We don't warn about variables,
1690 because many programs have static variables
1691 that exist only to get some text into the object file. */
1692 if (TREE_CODE (decl) == FUNCTION_DECL
1693 && (warn_unused_function
1694 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1695 && DECL_INITIAL (decl) == 0
1696 && DECL_EXTERNAL (decl)
1697 && ! DECL_ARTIFICIAL (decl)
1698 && ! TREE_PUBLIC (decl))
1700 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1701 pedwarn ("%J'%F' used but never defined", decl, decl);
1703 warning ("%J'%F' declared `static' but never defined", decl, decl);
1704 /* This symbol is effectively an "extern" declaration now. */
1705 TREE_PUBLIC (decl) = 1;
1706 assemble_external (decl);
1709 /* Warn about static fns or vars defined but not used. */
1710 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1711 /* We don't warn about "static const" variables because the
1712 "rcs_id" idiom uses that construction. */
1713 || (warn_unused_variable
1714 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1715 && ! DECL_IN_SYSTEM_HEADER (decl)
1716 && ! TREE_USED (decl)
1717 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1718 to handle multiple external decls in different scopes. */
1719 && ! TREE_USED (DECL_NAME (decl))
1720 && ! DECL_EXTERNAL (decl)
1721 && ! TREE_PUBLIC (decl)
1722 /* A volatile variable might be used in some non-obvious way. */
1723 && ! TREE_THIS_VOLATILE (decl)
1724 /* Global register variables must be declared to reserve them. */
1725 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1726 /* Otherwise, ask the language. */
1727 && (*lang_hooks.decls.warn_unused_global) (decl))
1728 warning ("%J'%D' defined but not used", decl, decl);
1730 /* Avoid confusing the debug information machinery when there are
1732 if (errorcount == 0 && sorrycount == 0)
1734 timevar_push (TV_SYMOUT);
1735 (*debug_hooks->global_decl) (decl);
1736 timevar_pop (TV_SYMOUT);
1741 /* Warn about a use of an identifier which was marked deprecated. */
1743 warn_deprecated_use (tree node)
1745 if (node == 0 || !warn_deprecated_decl)
1749 warning ("`%s' is deprecated (declared at %s:%d)",
1750 IDENTIFIER_POINTER (DECL_NAME (node)),
1751 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1752 else if (TYPE_P (node))
1754 const char *what = NULL;
1755 tree decl = TYPE_STUB_DECL (node);
1757 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1758 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1759 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1760 && DECL_NAME (TYPE_NAME (node)))
1761 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1766 warning ("`%s' is deprecated (declared at %s:%d)", what,
1767 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1769 warning ("`%s' is deprecated", what);
1772 warning ("type is deprecated (declared at %s:%d)",
1773 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1775 warning ("type is deprecated");
1779 /* Save the current INPUT_LOCATION on the top entry in the
1780 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1781 INPUT_LOCATION accordingly. */
1784 push_srcloc (const char *file, int line)
1786 struct file_stack *fs;
1788 fs = xmalloc (sizeof (struct file_stack));
1789 fs->location = input_location;
1790 fs->next = input_file_stack;
1791 input_filename = file;
1793 input_file_stack = fs;
1794 input_file_stack_tick++;
1797 /* Pop the top entry off the stack of presently open source files.
1798 Restore the INPUT_LOCATION from the new topmost entry on the
1804 struct file_stack *fs;
1806 fs = input_file_stack;
1807 input_location = fs->location;
1808 input_file_stack = fs->next;
1810 input_file_stack_tick++;
1813 /* Compile an entire translation unit. Write a file of assembly
1814 output and various debugging dumps. */
1819 /* Initialize yet another pass. */
1821 init_final (main_input_filename);
1822 coverage_init (aux_base_name);
1824 timevar_push (TV_PARSE);
1826 /* Call the parser, which parses the entire file (calling
1827 rest_of_compilation for each function). */
1828 (*lang_hooks.parse_file) (set_yydebug);
1830 /* In case there were missing block closers,
1831 get us back to the global binding level. */
1832 (*lang_hooks.clear_binding_stack) ();
1834 /* Compilation is now finished except for writing
1835 what's left of the symbol table output. */
1836 timevar_pop (TV_PARSE);
1838 if (flag_syntax_only)
1841 (*lang_hooks.decls.final_write_globals)();
1843 cgraph_varpool_assemble_pending_decls ();
1845 /* This must occur after the loop to output deferred functions.
1846 Else the coverage initializer would not be emitted if all the
1847 functions in this compilation unit were deferred. */
1850 /* Write out any pending weak symbol declarations. */
1854 /* Do dbx symbols. */
1855 timevar_push (TV_SYMOUT);
1857 #ifdef DWARF2_UNWIND_INFO
1858 if (dwarf2out_do_frame ())
1859 dwarf2out_frame_finish ();
1862 (*debug_hooks->finish) (main_input_filename);
1863 timevar_pop (TV_SYMOUT);
1865 /* Output some stuff at end of file if nec. */
1867 dw2_output_indirect_constants ();
1869 /* Flush any pending equate directives. */
1870 process_pending_assemble_output_defs ();
1872 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1874 timevar_push (TV_DUMP);
1875 open_dump_file (DFI_bp, NULL);
1879 close_dump_file (DFI_bp, NULL, NULL_RTX);
1880 timevar_pop (TV_DUMP);
1883 targetm.asm_out.file_end ();
1885 /* Attach a special .ident directive to the end of the file to identify
1886 the version of GCC which compiled this code. The format of the .ident
1887 string is patterned after the ones produced by native SVR4 compilers. */
1890 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1891 IDENT_ASM_OP, version_string);
1894 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1896 timevar_push (TV_DUMP);
1897 dump_combine_total_stats (rtl_dump_file);
1898 close_dump_file (DFI_combine, NULL, NULL_RTX);
1899 timevar_pop (TV_DUMP);
1903 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1904 and TYPE_DECL nodes.
1906 This does nothing for local (non-static) variables, unless the
1907 variable is a register variable with an ASMSPEC. In that case, or
1908 if the variable is not an automatic, it sets up the RTL and
1909 outputs any assembler code (label definition, storage allocation
1910 and initialization).
1912 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1913 the assembler symbol name to be used. TOP_LEVEL is nonzero
1914 if this declaration is not within a function. */
1917 rest_of_decl_compilation (tree decl,
1918 const char *asmspec,
1922 /* We deferred calling assemble_alias so that we could collect
1923 other attributes such as visibility. Emit the alias now. */
1926 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1929 alias = TREE_VALUE (TREE_VALUE (alias));
1930 alias = get_identifier (TREE_STRING_POINTER (alias));
1931 assemble_alias (decl, alias);
1935 /* Forward declarations for nested functions are not "external",
1936 but we need to treat them as if they were. */
1937 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1938 || TREE_CODE (decl) == FUNCTION_DECL)
1940 timevar_push (TV_VARCONST);
1943 make_decl_rtl (decl, asmspec);
1945 /* Don't output anything when a tentative file-scope definition
1946 is seen. But at end of compilation, do output code for them.
1948 We do output all variables when unit-at-a-time is active and rely on
1949 callgraph code to defer them except for forward declarations
1950 (see gcc.c-torture/compile/920624-1.c) */
1952 || !DECL_DEFER_OUTPUT (decl)
1953 || (flag_unit_at_a_time && DECL_INITIAL (decl)))
1954 && !DECL_EXTERNAL (decl))
1956 if (flag_unit_at_a_time && !cgraph_global_info_ready
1957 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1958 cgraph_varpool_finalize_decl (decl);
1960 assemble_variable (decl, top_level, at_end, 0);
1963 #ifdef ASM_FINISH_DECLARE_OBJECT
1964 if (decl == last_assemble_variable_decl)
1966 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1971 timevar_pop (TV_VARCONST);
1973 else if (DECL_REGISTER (decl) && asmspec != 0)
1975 if (decode_reg_name (asmspec) >= 0)
1977 SET_DECL_RTL (decl, NULL_RTX);
1978 make_decl_rtl (decl, asmspec);
1982 error ("invalid register name `%s' for register variable", asmspec);
1983 DECL_REGISTER (decl) = 0;
1988 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1989 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1990 && TREE_CODE (decl) == TYPE_DECL)
1992 timevar_push (TV_SYMOUT);
1993 dbxout_symbol (decl, 0);
1994 timevar_pop (TV_SYMOUT);
1997 #ifdef SDB_DEBUGGING_INFO
1998 else if (write_symbols == SDB_DEBUG && top_level
1999 && TREE_CODE (decl) == TYPE_DECL)
2001 timevar_push (TV_SYMOUT);
2002 sdbout_symbol (decl, 0);
2003 timevar_pop (TV_SYMOUT);
2006 #ifdef DWARF2_DEBUGGING_INFO
2007 else if ((write_symbols == DWARF2_DEBUG
2008 || write_symbols == VMS_AND_DWARF2_DEBUG)
2010 && TREE_CODE (decl) == TYPE_DECL)
2012 timevar_push (TV_SYMOUT);
2013 dwarf2out_decl (decl);
2014 timevar_pop (TV_SYMOUT);
2019 /* Called after finishing a record, union or enumeral type. */
2022 rest_of_type_compilation (
2023 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2024 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2028 tree type ATTRIBUTE_UNUSED,
2029 int toplev ATTRIBUTE_UNUSED
2033 /* Avoid confusing the debug information machinery when there are
2035 if (errorcount != 0 || sorrycount != 0)
2038 timevar_push (TV_SYMOUT);
2039 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2040 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2041 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2043 #ifdef SDB_DEBUGGING_INFO
2044 if (write_symbols == SDB_DEBUG)
2045 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2047 #ifdef DWARF2_DEBUGGING_INFO
2048 if ((write_symbols == DWARF2_DEBUG
2049 || write_symbols == VMS_AND_DWARF2_DEBUG)
2051 dwarf2out_decl (TYPE_STUB_DECL (type));
2053 timevar_pop (TV_SYMOUT);
2056 /* Turn the RTL into assembly. */
2058 rest_of_handle_final (tree decl, rtx insns)
2060 timevar_push (TV_FINAL);
2065 /* Get the function's name, as described by its RTL. This may be
2066 different from the DECL_NAME name used in the source file. */
2068 x = DECL_RTL (decl);
2069 if (GET_CODE (x) != MEM)
2072 if (GET_CODE (x) != SYMBOL_REF)
2074 fnname = XSTR (x, 0);
2076 assemble_start_function (decl, fnname);
2077 final_start_function (insns, asm_out_file, optimize);
2078 final (insns, asm_out_file, optimize, 0);
2079 final_end_function ();
2081 #ifdef IA64_UNWIND_INFO
2082 /* ??? The IA-64 ".handlerdata" directive must be issued before
2083 the ".endp" directive that closes the procedure descriptor. */
2084 output_function_exception_table ();
2087 assemble_end_function (decl, fnname);
2089 #ifndef IA64_UNWIND_INFO
2090 /* Otherwise, it feels unclean to switch sections in the middle. */
2091 output_function_exception_table ();
2095 fflush (asm_out_file);
2097 /* Release all memory allocated by flow. */
2098 free_basic_block_vars (0);
2100 /* Release all memory held by regsets now. */
2101 regset_release_memory ();
2103 timevar_pop (TV_FINAL);
2109 /* Run delay slot optimization. */
2111 rest_of_handle_delay_slots (tree decl, rtx insns)
2113 timevar_push (TV_DBR_SCHED);
2114 open_dump_file (DFI_dbr, decl);
2116 dbr_schedule (insns, rtl_dump_file);
2118 close_dump_file (DFI_dbr, print_rtl, insns);
2119 timevar_pop (TV_DBR_SCHED);
2126 /* Convert register usage from flat register file usage to a stack
2129 rest_of_handle_stack_regs (tree decl, rtx insns)
2131 #if defined (HAVE_ATTR_length)
2132 /* If flow2 creates new instructions which need splitting
2133 and scheduling after reload is not done, they might not be
2134 split until final which doesn't allow splitting
2135 if HAVE_ATTR_length. */
2136 #ifdef INSN_SCHEDULING
2137 if (optimize && !flag_schedule_insns_after_reload)
2142 timevar_push (TV_SHORTEN_BRANCH);
2143 split_all_insns (1);
2144 timevar_pop (TV_SHORTEN_BRANCH);
2148 timevar_push (TV_REG_STACK);
2149 open_dump_file (DFI_stack, decl);
2151 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2153 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2154 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2155 && flag_reorder_blocks)
2157 reorder_basic_blocks (0);
2158 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2162 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2163 timevar_pop (TV_REG_STACK);
2170 /* Machine independent reorg pass. */
2172 rest_of_handle_machine_reorg (tree decl, rtx insns)
2174 timevar_push (TV_MACH_DEP);
2175 open_dump_file (DFI_mach, decl);
2177 (*targetm.machine_dependent_reorg) ();
2179 close_dump_file (DFI_mach, print_rtl, insns);
2180 timevar_pop (TV_MACH_DEP);
2186 /* Run new register allocator. Return TRUE if we must exit
2187 rest_of_compilation upon return. */
2189 rest_of_handle_new_regalloc (tree decl, rtx insns)
2193 delete_trivially_dead_insns (insns, max_reg_num ());
2196 timevar_pop (TV_LOCAL_ALLOC);
2197 if (dump_file[DFI_lreg].enabled)
2199 timevar_push (TV_DUMP);
2201 close_dump_file (DFI_lreg, NULL, NULL);
2202 timevar_pop (TV_DUMP);
2205 /* XXX clean up the whole mess to bring live info in shape again. */
2206 timevar_push (TV_GLOBAL_ALLOC);
2207 open_dump_file (DFI_greg, decl);
2209 build_insn_chain (insns);
2210 failure = reload (insns, 0);
2212 timevar_pop (TV_GLOBAL_ALLOC);
2214 if (dump_file[DFI_greg].enabled)
2216 timevar_push (TV_DUMP);
2218 dump_global_regs (rtl_dump_file);
2220 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2221 timevar_pop (TV_DUMP);
2227 reload_completed = 1;
2232 /* Run old register allocator. Return TRUE if we must exit
2233 rest_of_compilation upon return. */
2235 rest_of_handle_old_regalloc (tree decl, rtx insns)
2240 /* Allocate the reg_renumber array. */
2241 allocate_reg_info (max_regno, FALSE, TRUE);
2243 /* And the reg_equiv_memory_loc array. */
2244 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2246 allocate_initial_values (reg_equiv_memory_loc);
2248 regclass (insns, max_reg_num (), rtl_dump_file);
2249 rebuild_notes = local_alloc ();
2251 timevar_pop (TV_LOCAL_ALLOC);
2253 /* Local allocation may have turned an indirect jump into a direct
2254 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2258 timevar_push (TV_JUMP);
2260 rebuild_jump_labels (insns);
2261 purge_all_dead_edges (0);
2263 timevar_pop (TV_JUMP);
2266 if (dump_file[DFI_lreg].enabled)
2268 timevar_push (TV_DUMP);
2270 dump_flow_info (rtl_dump_file);
2271 dump_local_alloc (rtl_dump_file);
2273 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2274 timevar_pop (TV_DUMP);
2279 timevar_push (TV_GLOBAL_ALLOC);
2280 open_dump_file (DFI_greg, decl);
2282 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2283 pass fixing up any insns that are invalid. */
2286 failure = global_alloc (rtl_dump_file);
2289 build_insn_chain (insns);
2290 failure = reload (insns, 0);
2293 timevar_pop (TV_GLOBAL_ALLOC);
2295 if (dump_file[DFI_greg].enabled)
2297 timevar_push (TV_DUMP);
2299 dump_global_regs (rtl_dump_file);
2301 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2302 timevar_pop (TV_DUMP);
2308 /* Run the regrename and cprop passes. */
2310 rest_of_handle_regrename (tree decl, rtx insns)
2312 timevar_push (TV_RENAME_REGISTERS);
2313 open_dump_file (DFI_rnreg, decl);
2315 if (flag_rename_registers)
2316 regrename_optimize ();
2317 if (flag_cprop_registers)
2318 copyprop_hardreg_forward ();
2320 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2321 timevar_pop (TV_RENAME_REGISTERS);
2324 /* Reorder basic blocks. */
2326 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2329 unsigned int liveness_flags;
2331 open_dump_file (DFI_bbro, decl);
2333 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2334 splitting possibly introduced more crossjumping opportunities. */
2335 liveness_flags = (!HAVE_conditional_execution ? CLEANUP_UPDATE_LIFE : 0);
2336 changed = cleanup_cfg (CLEANUP_EXPENSIVE | liveness_flags);
2338 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2339 tracer (liveness_flags);
2340 if (flag_reorder_blocks)
2341 reorder_basic_blocks (liveness_flags);
2342 if (flag_reorder_blocks
2343 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2344 changed |= cleanup_cfg (CLEANUP_EXPENSIVE | liveness_flags);
2346 /* On conditional execution targets we can not update the life cheaply, so
2347 we deffer the updating to after both cleanups. This may lose some cases
2348 but should not be terribly bad. */
2349 if (changed && HAVE_conditional_execution)
2350 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2351 PROP_DEATH_NOTES | PROP_REG_INFO);
2352 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2355 #ifdef INSN_SCHEDULING
2356 /* Run instruction scheduler. */
2358 rest_of_handle_sched (tree decl, rtx insns)
2360 timevar_push (TV_SCHED);
2362 /* Print function header into sched dump now
2363 because doing the sched analysis makes some of the dump. */
2364 if (optimize > 0 && flag_schedule_insns)
2366 open_dump_file (DFI_sched, decl);
2368 /* Do control and data sched analysis,
2369 and write some of the results to dump file. */
2371 schedule_insns (rtl_dump_file);
2373 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2375 timevar_pop (TV_SCHED);
2380 /* Run second scheduling pass after reload. */
2382 rest_of_handle_sched2 (tree decl, rtx insns)
2384 timevar_push (TV_SCHED2);
2385 open_dump_file (DFI_sched2, decl);
2387 /* Do control and data sched analysis again,
2388 and write some more of the results to dump file. */
2390 split_all_insns (1);
2392 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2394 schedule_ebbs (rtl_dump_file);
2395 /* No liveness updating code yet, but it should be easy to do.
2396 reg-stack recompute the liveness when needed for now. */
2397 count_or_remove_death_notes (NULL, 1);
2398 cleanup_cfg (CLEANUP_EXPENSIVE);
2401 schedule_insns (rtl_dump_file);
2403 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2404 timevar_pop (TV_SCHED2);
2410 /* Register allocation pre-pass, to reduce number of moves necessary
2411 for two-address machines. */
2413 rest_of_handle_regmove (tree decl, rtx insns)
2415 timevar_push (TV_REGMOVE);
2416 open_dump_file (DFI_regmove, decl);
2418 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2420 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2421 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2422 timevar_pop (TV_REGMOVE);
2429 rest_of_handle_tracer (tree decl, rtx insns)
2431 open_dump_file (DFI_tracer, decl);
2433 dump_flow_info (rtl_dump_file);
2435 cleanup_cfg (CLEANUP_EXPENSIVE);
2436 reg_scan (insns, max_reg_num (), 0);
2437 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2440 /* If-conversion and CFG cleanup. */
2442 rest_of_handle_if_conversion (tree decl, rtx insns)
2444 open_dump_file (DFI_ce1, decl);
2445 if (flag_if_conversion)
2447 timevar_push (TV_IFCVT);
2449 dump_flow_info (rtl_dump_file);
2450 cleanup_cfg (CLEANUP_EXPENSIVE);
2451 reg_scan (insns, max_reg_num (), 0);
2453 timevar_pop (TV_IFCVT);
2455 timevar_push (TV_JUMP);
2456 cleanup_cfg (CLEANUP_EXPENSIVE);
2457 reg_scan (insns, max_reg_num (), 0);
2458 timevar_pop (TV_JUMP);
2459 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2462 /* Rerun if-conversion, as combine may have simplified things enough
2463 to now meet sequence length restrictions. */
2465 rest_of_handle_if_after_combine (tree decl, rtx insns)
2467 timevar_push (TV_IFCVT);
2468 open_dump_file (DFI_ce2, decl);
2474 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2475 timevar_pop (TV_IFCVT);
2479 rest_of_handle_web (tree decl, rtx insns)
2481 open_dump_file (DFI_web, decl);
2482 timevar_push (TV_WEB);
2484 delete_trivially_dead_insns (insns, max_reg_num ());
2485 cleanup_cfg (CLEANUP_EXPENSIVE);
2487 timevar_pop (TV_WEB);
2488 close_dump_file (DFI_web, print_rtl_with_bb, insns);
2489 reg_scan (get_insns (), max_reg_num (), 0);
2492 /* Do branch profiling and static profile estimation passes. */
2494 rest_of_handle_branch_prob (tree decl, rtx insns)
2498 timevar_push (TV_BRANCH_PROB);
2499 open_dump_file (DFI_bp, decl);
2501 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2504 /* Discover and record the loop depth at the head of each basic
2505 block. The loop infrastructure does the real job for us. */
2506 flow_loops_find (&loops, LOOP_TREE);
2509 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2511 /* Estimate using heuristics if no profiling info is available. */
2512 if (flag_guess_branch_prob)
2513 estimate_probability (&loops);
2515 flow_loops_free (&loops);
2516 free_dominance_info (CDI_DOMINATORS);
2517 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2518 timevar_pop (TV_BRANCH_PROB);
2521 /* Do optimizations based on expression value profiles. */
2523 rest_of_handle_value_profile_transformations (tree decl, rtx insns)
2525 open_dump_file (DFI_vpt, decl);
2526 timevar_push (TV_VPT);
2528 if (value_profile_transformations ())
2529 cleanup_cfg (CLEANUP_EXPENSIVE);
2531 timevar_pop (TV_VPT);
2532 close_dump_file (DFI_vpt, print_rtl_with_bb, insns);
2535 /* Do control and data flow analysis; write some of the results to the
2538 rest_of_handle_cfg (tree decl, rtx insns)
2540 open_dump_file (DFI_cfg, decl);
2542 dump_flow_info (rtl_dump_file);
2544 cleanup_cfg (CLEANUP_EXPENSIVE
2545 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2547 /* It may make more sense to mark constant functions after dead code is
2548 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2549 may insert code making function non-constant, but we still must consider
2550 it as constant, otherwise -fbranch-probabilities will not read data back.
2552 life_analysis rarely eliminates modification of external memory.
2556 /* Alias analysis depends on this information and mark_constant_function
2557 depends on alias analysis. */
2558 reg_scan (insns, max_reg_num (), 1);
2559 mark_constant_function ();
2562 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2565 /* Purge addressofs. */
2567 rest_of_handle_addressof (tree decl, rtx insns)
2569 open_dump_file (DFI_addressof, decl);
2571 purge_addressof (insns);
2572 if (optimize && purge_all_dead_edges (0))
2573 delete_unreachable_blocks ();
2574 reg_scan (insns, max_reg_num (), 1);
2576 close_dump_file (DFI_addressof, print_rtl, insns);
2579 /* We may have potential sibling or tail recursion sites. Select one
2580 (of possibly multiple) methods of performing the call. */
2582 rest_of_handle_sibling_calls (rtx insns)
2585 optimize_sibling_and_tail_recursive_calls ();
2587 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2588 free_bb_for_insn ();
2589 find_exception_handler_labels ();
2590 rebuild_jump_labels (insns);
2591 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2593 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2594 notes before simplifying cfg and we must do lowering after sibcall
2595 that unhides parts of RTL chain and cleans up the CFG.
2597 Until sibcall is replaced by tree-level optimizer, lets just
2598 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2599 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2600 if (GET_CODE (insn) == NOTE
2601 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2604 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2607 /* Perform jump bypassing and control flow optimizations. */
2609 rest_of_handle_jump_bypass (tree decl, rtx insns)
2611 timevar_push (TV_BYPASS);
2612 open_dump_file (DFI_bypass, decl);
2614 cleanup_cfg (CLEANUP_EXPENSIVE);
2615 reg_scan (insns, max_reg_num (), 1);
2617 if (bypass_jumps (rtl_dump_file))
2619 rebuild_jump_labels (insns);
2620 cleanup_cfg (CLEANUP_EXPENSIVE);
2621 delete_trivially_dead_insns (insns, max_reg_num ());
2624 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2625 timevar_pop (TV_BYPASS);
2629 #ifdef ENABLE_CHECKING
2630 verify_flow_info ();
2634 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2635 if we must exit rest_of_compilation upon return. */
2637 rest_of_handle_inlining (tree decl)
2644 /* If we are reconsidering an inline function at the end of
2645 compilation, skip the stuff for making it inline. */
2646 if (cfun->rtl_inline_init)
2648 cfun->rtl_inline_init = 1;
2650 /* If this is nested inside an inlined external function, pretend
2651 it was only declared. Since we cannot inline such functions,
2652 generating code for this one is not only not necessary but will
2653 confuse some debugging output writers. */
2654 for (parent = DECL_CONTEXT (current_function_decl);
2655 parent != NULL_TREE;
2656 parent = get_containing_scope (parent))
2657 if (TREE_CODE (parent) == FUNCTION_DECL
2658 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2660 DECL_INITIAL (decl) = 0;
2663 else if (TYPE_P (parent))
2664 /* A function in a local class should be treated normally. */
2667 /* If requested, consider whether to make this function inline. */
2668 if ((DECL_INLINE (decl) && !flag_no_inline)
2669 || flag_inline_functions)
2671 timevar_push (TV_INTEGRATION);
2672 lose = function_cannot_inline_p (decl);
2673 timevar_pop (TV_INTEGRATION);
2674 if (lose || ! optimize)
2676 if (warn_inline && lose && DECL_INLINE (decl))
2678 char *msg = concat ("%J", lose, NULL);
2679 warning (msg, decl);
2682 DECL_ABSTRACT_ORIGIN (decl) = 0;
2683 /* Don't really compile an extern inline function.
2684 If we can't make it inline, pretend
2685 it was only declared. */
2686 if (DECL_EXTERNAL (decl))
2688 DECL_INITIAL (decl) = 0;
2693 inlinable = DECL_INLINE (decl) = 1;
2696 insns = get_insns ();
2698 /* Dump the rtl code if we are dumping rtl. */
2700 if (open_dump_file (DFI_rtl, decl))
2702 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2703 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2704 close_dump_file (DFI_rtl, print_rtl, insns);
2707 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2708 sorts of eh initialization. Delay this until after the
2709 initial rtl dump so that we can see the original nesting. */
2710 convert_from_eh_region_ranges ();
2712 /* If function is inline, and we don't yet know whether to
2713 compile it by itself, defer decision till end of compilation.
2714 wrapup_global_declarations will (indirectly) call
2715 rest_of_compilation again for those functions that need to
2716 be output. Also defer those functions that we are supposed
2720 || (DECL_INLINE (decl)
2721 /* Egad. This RTL deferral test conflicts with Fortran assumptions
2722 for unreferenced symbols. See g77.f-torture/execute/980520-1.f.
2723 But removing this line from the check breaks all languages that
2724 use the call graph to output symbols. This hard-coded check is
2725 the least invasive work-around. Nested functions need to be
2727 && (flag_inline_functions
2728 || strcmp (lang_hooks.name, "GNU F77") == 0
2729 || (cgraph_n_nodes > 0 && cgraph_node (decl)->origin))
2730 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2731 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2732 && ! flag_keep_inline_functions)
2733 || DECL_EXTERNAL (decl))))
2734 DECL_DEFER_OUTPUT (decl) = 1;
2736 if (DECL_INLINE (decl))
2737 /* DWARF wants separate debugging info for abstract and
2738 concrete instances of all inline functions, including those
2739 declared inline but not inlined, and those inlined even
2740 though they weren't declared inline. Conveniently, that's
2741 what DECL_INLINE means at this point. */
2742 (*debug_hooks->deferred_inline_function) (decl);
2744 if (DECL_DEFER_OUTPUT (decl))
2746 /* If -Wreturn-type, we have to do a bit of compilation. We just
2747 want to call cleanup the cfg to figure out whether or not we can
2748 fall off the end of the function; we do the minimum amount of
2749 work necessary to make that safe. */
2750 if (warn_return_type)
2752 int saved_optimize = optimize;
2755 rebuild_jump_labels (insns);
2756 find_exception_handler_labels ();
2757 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2758 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2759 optimize = saved_optimize;
2761 /* CFG is no longer maintained up-to-date. */
2762 free_bb_for_insn ();
2765 set_nothrow_function_flags ();
2766 if (current_function_nothrow)
2767 /* Now we know that this can't throw; set the flag for the benefit
2768 of other functions later in this translation unit. */
2769 TREE_NOTHROW (current_function_decl) = 1;
2771 timevar_push (TV_INTEGRATION);
2772 save_for_inline (decl);
2773 timevar_pop (TV_INTEGRATION);
2774 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2778 /* If specified extern inline but we aren't inlining it, we are
2779 done. This goes for anything that gets here with DECL_EXTERNAL
2780 set, not just things with DECL_INLINE. */
2781 return (bool) DECL_EXTERNAL (decl);
2784 /* Try to identify useless null pointer tests and delete them. */
2786 rest_of_handle_null_pointer (tree decl, rtx insns)
2788 open_dump_file (DFI_null, decl);
2790 dump_flow_info (rtl_dump_file);
2792 if (delete_null_pointer_checks (insns))
2793 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2795 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2798 /* Try combining insns through substitution. */
2800 rest_of_handle_combine (tree decl, rtx insns)
2802 int rebuild_jump_labels_after_combine = 0;
2804 timevar_push (TV_COMBINE);
2805 open_dump_file (DFI_combine, decl);
2807 rebuild_jump_labels_after_combine
2808 = combine_instructions (insns, max_reg_num ());
2810 /* Combining insns may have turned an indirect jump into a
2811 direct jump. Rebuild the JUMP_LABEL fields of jumping
2813 if (rebuild_jump_labels_after_combine)
2815 timevar_push (TV_JUMP);
2816 rebuild_jump_labels (insns);
2817 timevar_pop (TV_JUMP);
2819 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2822 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2823 timevar_pop (TV_COMBINE);
2828 /* Perform life analysis. */
2830 rest_of_handle_life (tree decl, rtx insns)
2832 open_dump_file (DFI_life, decl);
2835 #ifdef ENABLE_CHECKING
2836 verify_flow_info ();
2838 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2840 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2842 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2843 timevar_pop (TV_FLOW);
2845 if (warn_uninitialized)
2847 uninitialized_vars_warning (DECL_INITIAL (decl));
2849 setjmp_args_warning ();
2854 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2856 /* Insns were inserted, and possibly pseudos created, so
2857 things might look a bit different. */
2858 insns = get_insns ();
2859 allocate_reg_life_data ();
2860 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2861 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2867 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2872 /* Perform common subexpression elimination. Nonzero value from
2873 `cse_main' means that jumps were simplified and some code may now
2874 be unreachable, so do jump optimization again. */
2876 rest_of_handle_cse (tree decl, rtx insns)
2880 open_dump_file (DFI_cse, decl);
2882 dump_flow_info (rtl_dump_file);
2883 timevar_push (TV_CSE);
2885 reg_scan (insns, max_reg_num (), 1);
2887 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2889 rebuild_jump_labels (insns);
2890 if (purge_all_dead_edges (0))
2891 delete_unreachable_blocks ();
2893 delete_trivially_dead_insns (insns, max_reg_num ());
2895 /* If we are not running more CSE passes, then we are no longer
2896 expecting CSE to be run. But always rerun it in a cheap mode. */
2897 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2899 if (tem || optimize > 1)
2900 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2901 /* Try to identify useless null pointer tests and delete them. */
2902 if (flag_delete_null_pointer_checks)
2904 timevar_push (TV_JUMP);
2906 if (delete_null_pointer_checks (insns))
2907 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2908 timevar_pop (TV_JUMP);
2911 /* The second pass of jump optimization is likely to have
2912 removed a bunch more instructions. */
2913 renumber_insns (rtl_dump_file);
2915 timevar_pop (TV_CSE);
2916 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2919 /* Run second CSE pass after loop optimizations. */
2921 rest_of_handle_cse2 (tree decl, rtx insns)
2925 timevar_push (TV_CSE2);
2926 open_dump_file (DFI_cse2, decl);
2928 dump_flow_info (rtl_dump_file);
2929 /* CFG is no longer maintained up-to-date. */
2930 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2932 /* Run a pass to eliminate duplicated assignments to condition code
2933 registers. We have to run this after bypass_jumps, because it
2934 makes it harder for that pass to determine whether a jump can be
2936 cse_condition_code_reg ();
2938 purge_all_dead_edges (0);
2939 delete_trivially_dead_insns (insns, max_reg_num ());
2943 timevar_push (TV_JUMP);
2944 rebuild_jump_labels (insns);
2945 cleanup_cfg (CLEANUP_EXPENSIVE);
2946 timevar_pop (TV_JUMP);
2948 reg_scan (insns, max_reg_num (), 0);
2949 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2951 timevar_pop (TV_CSE2);
2954 /* Perform global cse. */
2956 rest_of_handle_gcse (tree decl, rtx insns)
2958 int save_csb, save_cfj;
2961 timevar_push (TV_GCSE);
2962 open_dump_file (DFI_gcse, decl);
2964 tem = gcse_main (insns, rtl_dump_file);
2965 rebuild_jump_labels (insns);
2966 delete_trivially_dead_insns (insns, max_reg_num ());
2968 save_csb = flag_cse_skip_blocks;
2969 save_cfj = flag_cse_follow_jumps;
2970 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2972 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2973 if (current_function_calls_constant_p)
2974 purge_builtin_constant_p ();
2976 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2978 if (flag_expensive_optimizations)
2980 timevar_push (TV_CSE);
2981 reg_scan (insns, max_reg_num (), 1);
2982 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2983 purge_all_dead_edges (0);
2984 delete_trivially_dead_insns (insns, max_reg_num ());
2985 timevar_pop (TV_CSE);
2986 cse_not_expected = !flag_rerun_cse_after_loop;
2989 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2990 things up. Then possibly re-run CSE again. */
2994 timevar_push (TV_JUMP);
2995 rebuild_jump_labels (insns);
2996 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2997 timevar_pop (TV_JUMP);
2999 if (flag_expensive_optimizations)
3001 timevar_push (TV_CSE);
3002 reg_scan (insns, max_reg_num (), 1);
3003 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3004 purge_all_dead_edges (0);
3005 delete_trivially_dead_insns (insns, max_reg_num ());
3006 timevar_pop (TV_CSE);
3010 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
3011 timevar_pop (TV_GCSE);
3014 flag_cse_skip_blocks = save_csb;
3015 flag_cse_follow_jumps = save_cfj;
3016 #ifdef ENABLE_CHECKING
3017 verify_flow_info ();
3021 /* Move constant computations out of loops. */
3023 rest_of_handle_loop_optimize (tree decl, rtx insns)
3025 int do_unroll, do_prefetch;
3027 timevar_push (TV_LOOP);
3028 delete_dead_jumptables ();
3029 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3030 open_dump_file (DFI_loop, decl);
3032 /* CFG is no longer maintained up-to-date. */
3033 free_bb_for_insn ();
3035 if (flag_unroll_loops)
3036 do_unroll = LOOP_AUTO_UNROLL; /* Having two unrollers is useless. */
3038 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3039 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3041 if (flag_rerun_loop_opt)
3043 cleanup_barriers ();
3045 /* We only want to perform unrolling once. */
3046 loop_optimize (insns, rtl_dump_file, do_unroll);
3049 /* The first call to loop_optimize makes some instructions
3050 trivially dead. We delete those instructions now in the
3051 hope that doing so will make the heuristics in loop work
3052 better and possibly speed up compilation. */
3053 delete_trivially_dead_insns (insns, max_reg_num ());
3055 /* The regscan pass is currently necessary as the alias
3056 analysis code depends on this information. */
3057 reg_scan (insns, max_reg_num (), 1);
3059 cleanup_barriers ();
3060 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3062 /* Loop can create trivially dead instructions. */
3063 delete_trivially_dead_insns (insns, max_reg_num ());
3064 close_dump_file (DFI_loop, print_rtl, insns);
3065 timevar_pop (TV_LOOP);
3066 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3071 /* Perform loop optimizations. It might be better to do them a bit
3072 sooner, but we want the profile feedback to work more
3075 rest_of_handle_loop2 (tree decl, rtx insns)
3077 struct loops *loops;
3078 timevar_push (TV_LOOP);
3079 open_dump_file (DFI_loop2, decl);
3081 dump_flow_info (rtl_dump_file);
3083 loops = loop_optimizer_init (rtl_dump_file);
3087 /* The optimizations: */
3088 if (flag_unswitch_loops)
3089 unswitch_loops (loops);
3091 if (flag_peel_loops || flag_unroll_loops)
3092 unroll_and_peel_loops (loops,
3093 (flag_peel_loops ? UAP_PEEL : 0) |
3094 (flag_unroll_loops ? UAP_UNROLL : 0) |
3095 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3097 loop_optimizer_finalize (loops, rtl_dump_file);
3100 cleanup_cfg (CLEANUP_EXPENSIVE);
3101 delete_trivially_dead_insns (insns, max_reg_num ());
3102 reg_scan (insns, max_reg_num (), 0);
3104 dump_flow_info (rtl_dump_file);
3105 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3106 timevar_pop (TV_LOOP);
3110 /* This is called from finish_function (within langhooks.parse_file)
3111 after each top-level definition is parsed.
3112 It is supposed to compile that function or variable
3113 and output the assembler code for it.
3114 After we return, the tree storage is freed. */
3117 rest_of_compilation (tree decl)
3121 timevar_push (TV_REST_OF_COMPILATION);
3123 /* Register rtl specific functions for cfg. */
3124 rtl_register_cfg_hooks ();
3126 /* Now that we're out of the frontend, we shouldn't have any more
3127 CONCATs anywhere. */
3128 generating_concat_p = 0;
3130 /* When processing delayed functions, prepare_function_start() won't
3131 have been run to re-initialize it. */
3132 cse_not_expected = ! optimize;
3134 /* First, make sure that NOTE_BLOCK is set correctly for each
3135 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3136 if (!cfun->x_whole_function_mode_p)
3139 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3140 tree in sensible shape. So, we just recalculate it here. */
3141 if (cfun->x_whole_function_mode_p)
3146 if (rest_of_handle_inlining (decl))
3147 goto exit_rest_of_compilation;
3149 /* If we're emitting a nested function, make sure its parent gets
3150 emitted as well. Doing otherwise confuses debug info. */
3153 for (parent = DECL_CONTEXT (current_function_decl);
3154 parent != NULL_TREE;
3155 parent = get_containing_scope (parent))
3156 if (TREE_CODE (parent) == FUNCTION_DECL)
3157 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3160 /* We are now committed to emitting code for this function. Do any
3161 preparation, such as emitting abstract debug info for the inline
3162 before it gets mangled by optimization. */
3163 if (cgraph_function_possibly_inlined_p (decl))
3164 (*debug_hooks->outlining_inline_function) (decl);
3166 /* Remove any notes we don't need. That will make iterating
3167 over the instruction sequence faster, and allow the garbage
3168 collector to reclaim the memory used by the notes. */
3169 remove_unnecessary_notes ();
3174 /* Initialize some variables used by the optimizers. */
3175 init_function_for_compilation ();
3177 if (! DECL_DEFER_OUTPUT (decl))
3178 TREE_ASM_WRITTEN (decl) = 1;
3180 /* Now that integrate will no longer see our rtl, we need not
3181 distinguish between the return value of this function and the
3182 return value of called functions. Also, we can remove all SETs
3183 of subregs of hard registers; they are only here because of
3184 integrate. Also, we can now initialize pseudos intended to
3185 carry magic hard reg data throughout the function. */
3186 rtx_equal_function_value_matters = 0;
3187 purge_hard_subreg_sets (get_insns ());
3189 /* Early return if there were errors. We can run afoul of our
3190 consistency checks, and there's not really much point in fixing them.
3191 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3192 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3193 || errorcount || sorrycount)
3194 goto exit_rest_of_compilation;
3196 timevar_push (TV_JUMP);
3197 open_dump_file (DFI_sibling, decl);
3198 insns = get_insns ();
3199 rebuild_jump_labels (insns);
3200 find_exception_handler_labels ();
3201 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3203 delete_unreachable_blocks ();
3205 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3206 if (flag_guess_branch_prob)
3208 timevar_push (TV_BRANCH_PROB);
3209 note_prediction_to_br_prob ();
3210 timevar_pop (TV_BRANCH_PROB);
3213 if (flag_optimize_sibling_calls)
3214 rest_of_handle_sibling_calls (insns);
3216 /* We have to issue these warnings now already, because CFG cleanups
3217 further down may destroy the required information. However, this
3218 must be done after the sibcall optimization pass because the barrier
3219 emitted for noreturn calls that are candidate for the optimization
3220 is folded into the CALL_PLACEHOLDER until after this pass, so the
3221 CFG is inaccurate. */
3222 check_function_return_warnings ();
3224 timevar_pop (TV_JUMP);
3226 insn_locators_initialize ();
3227 /* Complete generation of exception handling code. */
3230 timevar_push (TV_JUMP);
3231 open_dump_file (DFI_eh, decl);
3233 finish_eh_generation ();
3235 close_dump_file (DFI_eh, print_rtl, get_insns ());
3236 timevar_pop (TV_JUMP);
3239 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3240 generation, which might create new sets. */
3241 emit_initial_value_sets ();
3244 /* If we are doing position-independent code generation, now
3245 is the time to output special prologues and epilogues.
3246 We do not want to do this earlier, because it just clutters
3247 up inline functions with meaningless insns. */
3252 insns = get_insns ();
3254 /* Copy any shared structure that should not be shared. */
3255 unshare_all_rtl (current_function_decl, insns);
3257 #ifdef SETJMP_VIA_SAVE_AREA
3258 /* This must be performed before virtual register instantiation.
3259 Please be aware the everything in the compiler that can look
3260 at the RTL up to this point must understand that REG_SAVE_AREA
3261 is just like a use of the REG contained inside. */
3262 if (current_function_calls_alloca)
3263 optimize_save_area_alloca (insns);
3266 /* Instantiate all virtual registers. */
3267 instantiate_virtual_regs (current_function_decl, insns);
3269 open_dump_file (DFI_jump, decl);
3271 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3272 are initialized and to compute whether control can drop off the end
3275 timevar_push (TV_JUMP);
3276 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3277 before jump optimization switches branch directions. */
3278 if (flag_guess_branch_prob)
3279 expected_value_to_br_prob ();
3281 reg_scan (insns, max_reg_num (), 0);
3282 rebuild_jump_labels (insns);
3283 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3284 delete_trivially_dead_insns (insns, max_reg_num ());
3286 dump_flow_info (rtl_dump_file);
3287 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3288 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3292 free_bb_for_insn ();
3293 copy_loop_headers (insns);
3294 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3296 purge_line_number_notes (insns);
3298 timevar_pop (TV_JUMP);
3299 close_dump_file (DFI_jump, print_rtl, insns);
3301 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3302 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3303 goto exit_rest_of_compilation;
3305 timevar_push (TV_JUMP);
3308 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3310 if (flag_delete_null_pointer_checks)
3311 rest_of_handle_null_pointer (decl, insns);
3313 /* Jump optimization, and the removal of NULL pointer checks, may
3314 have reduced the number of instructions substantially. CSE, and
3315 future passes, allocate arrays whose dimensions involve the
3316 maximum instruction UID, so if we can reduce the maximum UID
3317 we'll save big on memory. */
3318 renumber_insns (rtl_dump_file);
3319 timevar_pop (TV_JUMP);
3321 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3326 rest_of_handle_cse (decl, insns);
3328 rest_of_handle_addressof (decl, insns);
3335 rest_of_handle_gcse (decl, insns);
3337 if (flag_loop_optimize)
3338 rest_of_handle_loop_optimize (decl, insns);
3341 rest_of_handle_jump_bypass (decl, insns);
3344 timevar_push (TV_FLOW);
3346 rest_of_handle_cfg (decl, insns);
3349 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3351 rest_of_handle_branch_prob (decl, insns);
3353 if (flag_branch_probabilities
3354 && flag_profile_values
3355 && flag_value_profile_transformations)
3356 rest_of_handle_value_profile_transformations (decl, insns);
3358 /* Remove the death notes created for vpt. */
3359 if (flag_profile_values)
3360 count_or_remove_death_notes (NULL, 1);
3364 rest_of_handle_if_conversion (decl, insns);
3367 rest_of_handle_tracer (decl, insns);
3370 && (flag_unswitch_loops
3372 || flag_unroll_loops))
3373 rest_of_handle_loop2 (decl, insns);
3376 rest_of_handle_web (decl, insns);
3378 if (flag_rerun_cse_after_loop)
3379 rest_of_handle_cse2 (decl, insns);
3381 cse_not_expected = 1;
3383 rest_of_handle_life (decl, insns);
3386 rest_of_handle_combine (decl, insns);
3388 if (flag_if_conversion)
3389 rest_of_handle_if_after_combine (decl, insns);
3391 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3392 rest_of_handle_regmove (decl, insns);
3394 /* Do unconditional splitting before register allocation to allow machine
3395 description to add extra information not needed previously. */
3396 split_all_insns (1);
3398 #ifdef OPTIMIZE_MODE_SWITCHING
3399 timevar_push (TV_MODE_SWITCH);
3402 optimize_mode_switching (NULL);
3405 timevar_pop (TV_MODE_SWITCH);
3408 /* Any of the several passes since flow1 will have munged register
3409 lifetime data a bit. We need it to be up to date for scheduling
3410 (see handling of reg_known_equiv in init_alias_analysis). */
3411 recompute_reg_usage (insns, !optimize_size);
3413 #ifdef INSN_SCHEDULING
3414 rest_of_handle_sched (decl, insns);
3417 /* Determine if the current function is a leaf before running reload
3418 since this can impact optimizations done by the prologue and
3419 epilogue thus changing register elimination offsets. */
3420 current_function_is_leaf = leaf_function_p ();
3422 timevar_push (TV_LOCAL_ALLOC);
3423 open_dump_file (DFI_lreg, decl);
3425 if (flag_new_regalloc)
3427 if (rest_of_handle_new_regalloc (decl, insns))
3428 goto exit_rest_of_compilation;
3432 if (rest_of_handle_old_regalloc (decl, insns))
3433 goto exit_rest_of_compilation;
3438 open_dump_file (DFI_postreload, decl);
3440 /* Do a very simple CSE pass over just the hard registers. */
3443 timevar_push (TV_RELOAD_CSE_REGS);
3444 reload_cse_regs (insns);
3445 /* reload_cse_regs can eliminate potentially-trapping MEMs.
3446 Remove any EH edges associated with them. */
3447 if (flag_non_call_exceptions)
3448 purge_all_dead_edges (0);
3449 timevar_pop (TV_RELOAD_CSE_REGS);
3452 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3454 /* Re-create the death notes which were deleted during reload. */
3455 timevar_push (TV_FLOW2);
3456 open_dump_file (DFI_flow2, decl);
3458 #ifdef ENABLE_CHECKING
3459 verify_flow_info ();
3462 /* If optimizing, then go ahead and split insns now. */
3466 split_all_insns (0);
3468 if (flag_branch_target_load_optimize)
3470 open_dump_file (DFI_branch_target_load, decl);
3472 branch_target_load_optimize (insns, false);
3474 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3480 cleanup_cfg (CLEANUP_EXPENSIVE);
3482 /* On some machines, the prologue and epilogue code, or parts thereof,
3483 can be represented as RTL. Doing so lets us schedule insns between
3484 it and the rest of the code and also allows delayed branch
3485 scheduling to operate in the epilogue. */
3486 thread_prologue_and_epilogue_insns (insns);
3487 epilogue_completed = 1;
3491 life_analysis (insns, rtl_dump_file, PROP_POSTRELOAD);
3492 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3493 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3495 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3496 even for machines with possibly nonzero RETURN_POPS_ARGS
3497 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3498 push instructions will have popping returns. */
3499 #ifndef PUSH_ROUNDING
3500 if (!ACCUMULATE_OUTGOING_ARGS)
3502 combine_stack_adjustments ();
3507 flow2_completed = 1;
3509 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3510 timevar_pop (TV_FLOW2);
3512 #ifdef HAVE_peephole2
3513 if (optimize > 0 && flag_peephole2)
3515 timevar_push (TV_PEEPHOLE2);
3516 open_dump_file (DFI_peephole2, decl);
3518 peephole2_optimize (rtl_dump_file);
3520 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3521 timevar_pop (TV_PEEPHOLE2);
3525 open_dump_file (DFI_ce3, decl);
3527 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3528 splitting possibly introduced more crossjumping opportunities. */
3529 cleanup_cfg (CLEANUP_EXPENSIVE
3530 | CLEANUP_UPDATE_LIFE
3531 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3532 if (flag_if_conversion2)
3534 timevar_push (TV_IFCVT2);
3538 timevar_pop (TV_IFCVT2);
3540 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3544 if (flag_rename_registers || flag_cprop_registers)
3545 rest_of_handle_regrename (decl, insns);
3547 rest_of_handle_reorder_blocks (decl, insns);
3550 if (flag_branch_target_load_optimize2)
3552 /* Leave this a warning for now so that it is possible to experiment
3553 with running this pass twice. In 3.6, we should either make this
3554 an error, or use separate dump files. */
3555 if (flag_branch_target_load_optimize)
3556 warning ("branch target register load optimization is not intended "
3559 open_dump_file (DFI_branch_target_load, decl);
3561 branch_target_load_optimize (insns, true);
3563 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3568 #ifdef INSN_SCHEDULING
3569 if (optimize > 0 && flag_schedule_insns_after_reload)
3570 rest_of_handle_sched2 (decl, insns);
3573 #ifdef LEAF_REGISTERS
3574 current_function_uses_only_leaf_regs
3575 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3579 rest_of_handle_stack_regs (decl, insns);
3582 compute_alignments ();
3584 /* CFG is no longer maintained up-to-date. */
3585 free_bb_for_insn ();
3587 if (targetm.machine_dependent_reorg != 0)
3588 rest_of_handle_machine_reorg (decl, insns);
3590 purge_line_number_notes (insns);
3591 cleanup_barriers ();
3594 if (optimize > 0 && flag_delayed_branch)
3595 rest_of_handle_delay_slots (decl, insns);
3598 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3599 timevar_push (TV_SHORTEN_BRANCH);
3600 split_all_insns_noflow ();
3601 timevar_pop (TV_SHORTEN_BRANCH);
3604 convert_to_eh_region_ranges ();
3606 /* Shorten branches. */
3607 timevar_push (TV_SHORTEN_BRANCH);
3608 shorten_branches (get_insns ());
3609 timevar_pop (TV_SHORTEN_BRANCH);
3611 set_nothrow_function_flags ();
3612 if (current_function_nothrow)
3613 /* Now we know that this can't throw; set the flag for the benefit
3614 of other functions later in this translation unit. */
3615 TREE_NOTHROW (current_function_decl) = 1;
3617 rest_of_handle_final (decl, insns);
3619 /* Write DBX symbols if requested. */
3621 /* Note that for those inline functions where we don't initially
3622 know for certain that we will be generating an out-of-line copy,
3623 the first invocation of this routine (rest_of_compilation) will
3624 skip over this code by doing a `goto exit_rest_of_compilation;'.
3625 Later on, wrapup_global_declarations will (indirectly) call
3626 rest_of_compilation again for those inline functions that need
3627 to have out-of-line copies generated. During that call, we
3628 *will* be routed past here. */
3630 timevar_push (TV_SYMOUT);
3631 (*debug_hooks->function_decl) (decl);
3632 timevar_pop (TV_SYMOUT);
3634 exit_rest_of_compilation:
3636 coverage_end_function ();
3638 /* In case the function was not output,
3639 don't leave any temporary anonymous types
3640 queued up for sdb output. */
3641 #ifdef SDB_DEBUGGING_INFO
3642 if (write_symbols == SDB_DEBUG)
3643 sdbout_types (NULL_TREE);
3646 reload_completed = 0;
3647 epilogue_completed = 0;
3648 flow2_completed = 0;
3651 timevar_push (TV_FINAL);
3653 /* Clear out the insn_length contents now that they are no
3655 init_insn_lengths ();
3657 /* Show no temporary slots allocated. */
3660 free_basic_block_vars (0);
3661 free_bb_for_insn ();
3663 timevar_pop (TV_FINAL);
3665 if ((*targetm.binds_local_p) (current_function_decl))
3667 int pref = cfun->preferred_stack_boundary;
3668 if (cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3669 pref = cfun->stack_alignment_needed;
3670 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3674 /* Make sure volatile mem refs aren't considered valid operands for
3675 arithmetic insns. We must call this here if this is a nested inline
3676 function, since the above code leaves us in the init_recog state
3677 (from final.c), and the function context push/pop code does not
3678 save/restore volatile_ok.
3680 ??? Maybe it isn't necessary for expand_start_function to call this
3681 anymore if we do it here? */
3683 init_recog_no_volatile ();
3685 /* We're done with this function. Free up memory if we can. */
3686 free_after_parsing (cfun);
3687 if (! DECL_DEFER_OUTPUT (decl))
3689 free_after_compilation (cfun);
3690 DECL_SAVED_INSNS (decl) = 0;
3696 timevar_pop (TV_REST_OF_COMPILATION);
3699 /* Display help for target options. */
3701 display_target_options (void)
3704 static bool displayed = false;
3706 /* Avoid double printing for --help --target-help. */
3712 if (ARRAY_SIZE (target_switches) > 1
3713 #ifdef TARGET_OPTIONS
3714 || ARRAY_SIZE (target_options) > 1
3722 printf (_("\nTarget specific options:\n"));
3724 for (i = ARRAY_SIZE (target_switches); i--;)
3726 const char *option = target_switches[i].name;
3727 const char *description = target_switches[i].description;
3729 if (option == NULL || *option == 0)
3731 else if (description == NULL)
3736 printf (_(" -m%-23s [undocumented]\n"), option);
3738 else if (*description != 0)
3739 doc += printf (" -m%-23s %s\n", option, _(description));
3742 #ifdef TARGET_OPTIONS
3743 for (i = ARRAY_SIZE (target_options); i--;)
3745 const char *option = target_options[i].prefix;
3746 const char *description = target_options[i].description;
3748 if (option == NULL || *option == 0)
3750 else if (description == NULL)
3755 printf (_(" -m%-23s [undocumented]\n"), option);
3757 else if (*description != 0)
3758 doc += printf (" -m%-23s %s\n", option, _(description));
3764 printf (_("\nThere are undocumented target specific options as well.\n"));
3766 printf (_(" They exist, but they are not documented.\n"));
3771 /* Parse a -d... command line switch. */
3774 decode_d_option (const char *arg)
3782 for (i = 0; i < (int) DFI_MAX; ++i)
3783 dump_file[i].enabled = 1;
3789 flag_print_asm_name = 1;
3792 flag_dump_rtl_in_asm = 1;
3793 flag_print_asm_name = 1;
3796 graph_dump_format = vcg;
3799 rtl_dump_and_exit = 1;
3804 case 'D': /* These are handled by the preprocessor. */
3808 setup_core_dumping();
3813 for (i = 0; i < (int) DFI_MAX; ++i)
3814 if (c == dump_file[i].debug_switch)
3816 dump_file[i].enabled = 1;
3821 warning ("unrecognized gcc debugging option: %c", c);
3826 /* Indexed by enum debug_info_type. */
3827 const char *const debug_type_names[] =
3829 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3832 /* Decode -m switches. */
3833 /* Decode the switch -mNAME. */
3836 set_target_switch (const char *name)
3839 int valid_target_option = 0;
3841 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3842 if (!strcmp (target_switches[j].name, name))
3844 if (target_switches[j].value < 0)
3845 target_flags &= ~-target_switches[j].value;
3847 target_flags |= target_switches[j].value;
3850 if (target_switches[j].value < 0)
3851 target_flags_explicit |= -target_switches[j].value;
3853 target_flags_explicit |= target_switches[j].value;
3855 valid_target_option = 1;
3858 #ifdef TARGET_OPTIONS
3859 if (!valid_target_option)
3860 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3862 int len = strlen (target_options[j].prefix);
3863 if (target_options[j].value)
3865 if (!strcmp (target_options[j].prefix, name))
3867 *target_options[j].variable = target_options[j].value;
3868 valid_target_option = 1;
3873 if (!strncmp (target_options[j].prefix, name, len))
3875 *target_options[j].variable = name + len;
3876 valid_target_option = 1;
3882 if (!valid_target_option)
3883 error ("invalid option `%s'", name);
3886 /* Print version information to FILE.
3887 Each line begins with INDENT (for the case where FILE is the
3888 assembler output file). */
3891 print_version (FILE *file, const char *indent)
3894 #define __VERSION__ "[?]"
3898 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3900 "%s%s%s version %s (%s) compiled by CC.\n"
3902 , indent, *indent != 0 ? " " : "",
3903 lang_hooks.name, version_string, TARGET_NAME,
3904 indent, __VERSION__);
3905 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3906 indent, *indent != 0 ? " " : "",
3907 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3910 /* Print an option value and return the adjusted position in the line.
3911 ??? We don't handle error returns from fprintf (disk full); presumably
3912 other code will catch a disk full though. */
3915 print_single_switch (FILE *file, int pos, int max,
3916 const char *indent, const char *sep, const char *term,
3917 const char *type, const char *name)
3919 /* The ultrix fprintf returns 0 on success, so compute the result we want
3920 here since we need it for the following test. */
3921 int len = strlen (sep) + strlen (type) + strlen (name);
3926 fprintf (file, "%s", term);
3931 fprintf (file, "%s", indent);
3932 pos = strlen (indent);
3934 fprintf (file, "%s%s%s", sep, type, name);
3939 /* Print active target switches to FILE.
3940 POS is the current cursor position and MAX is the size of a "line".
3941 Each line begins with INDENT and ends with TERM.
3942 Each switch is separated from the next by SEP. */
3945 print_switch_values (FILE *file, int pos, int max,
3946 const char *indent, const char *sep, const char *term)
3951 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3952 that it can be printed below. This helps reproducibility. */
3955 /* Print the options as passed. */
3956 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3957 _("options passed: "), "");
3959 for (p = &save_argv[1]; *p != NULL; p++)
3963 if (strcmp (*p, "-o") == 0)
3969 if (strcmp (*p, "-quiet") == 0)
3971 if (strcmp (*p, "-version") == 0)
3976 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3979 fprintf (file, "%s", term);
3981 /* Print the -f and -m options that have been enabled.
3982 We don't handle language specific options but printing argv
3985 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3986 _("options enabled: "), "");
3988 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3989 if (*f_options[j].variable == f_options[j].on_value)
3990 pos = print_single_switch (file, pos, max, indent, sep, term,
3991 "-f", f_options[j].string);
3993 /* Print target specific options. */
3995 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3996 if (target_switches[j].name[0] != '\0'
3997 && target_switches[j].value > 0
3998 && ((target_switches[j].value & target_flags)
3999 == target_switches[j].value))
4001 pos = print_single_switch (file, pos, max, indent, sep, term,
4002 "-m", target_switches[j].name);
4005 #ifdef TARGET_OPTIONS
4006 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4007 if (*target_options[j].variable != NULL)
4010 sprintf (prefix, "-m%s", target_options[j].prefix);
4011 pos = print_single_switch (file, pos, max, indent, sep, term,
4012 prefix, *target_options[j].variable);
4016 fprintf (file, "%s", term);
4019 /* Open assembly code output file. Do this even if -fsyntax-only is
4020 on, because then the driver will have provided the name of a
4021 temporary file or bit bucket for us. NAME is the file specified on
4022 the command line, possibly NULL. */
4024 init_asm_output (const char *name)
4026 if (name == NULL && asm_file_name == 0)
4027 asm_out_file = stdout;
4030 if (asm_file_name == 0)
4032 int len = strlen (dump_base_name);
4033 char *dumpname = xmalloc (len + 6);
4034 memcpy (dumpname, dump_base_name, len + 1);
4035 strip_off_ending (dumpname, len);
4036 strcat (dumpname, ".s");
4037 asm_file_name = dumpname;
4039 if (!strcmp (asm_file_name, "-"))
4040 asm_out_file = stdout;
4042 asm_out_file = fopen (asm_file_name, "w+");
4043 if (asm_out_file == 0)
4044 fatal_error ("can't open %s for writing: %m", asm_file_name);
4047 #ifdef IO_BUFFER_SIZE
4048 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
4049 _IOFBF, IO_BUFFER_SIZE);
4052 if (!flag_syntax_only)
4054 targetm.asm_out.file_start ();
4056 #ifdef ASM_COMMENT_START
4057 if (flag_verbose_asm)
4059 /* Print the list of options in effect. */
4060 print_version (asm_out_file, ASM_COMMENT_START);
4061 print_switch_values (asm_out_file, 0, MAX_LINE,
4062 ASM_COMMENT_START, " ", "\n");
4063 /* Add a blank line here so it appears in assembler output but not
4065 fprintf (asm_out_file, "\n");
4071 /* Default version of get_pch_validity.
4072 By default, every flag difference is fatal; that will be mostly right for
4073 most targets, but completely right for very few. */
4076 default_get_pch_validity (size_t *len)
4078 #ifdef TARGET_OPTIONS
4083 *len = sizeof (target_flags) + 2;
4084 #ifdef TARGET_OPTIONS
4085 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4088 if (*target_options[i].variable)
4089 *len += strlen (*target_options[i].variable);
4093 result = r = xmalloc (*len);
4097 memcpy (r, &target_flags, sizeof (target_flags));
4098 r += sizeof (target_flags);
4100 #ifdef TARGET_OPTIONS
4101 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4103 const char *str = *target_options[i].variable;
4107 l = strlen (str) + 1;
4116 /* Default version of pch_valid_p. */
4119 default_pch_valid_p (const void *data_p, size_t len)
4121 const char *data = (const char *)data_p;
4122 const char *flag_that_differs = NULL;
4125 /* -fpic and -fpie also usually make a PCH invalid. */
4126 if (data[0] != flag_pic)
4127 return _("created and used with different settings of -fpic");
4128 if (data[1] != flag_pie)
4129 return _("created and used with different settings of -fpie");
4132 /* Check target_flags. */
4133 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
4135 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
4140 memcpy (&tf, data, sizeof (target_flags));
4142 bits = target_switches[i].value;
4145 if ((target_flags & bits) != (tf & bits))
4147 flag_that_differs = target_switches[i].name;
4153 data += sizeof (target_flags);
4154 len -= sizeof (target_flags);
4156 /* Check string options. */
4157 #ifdef TARGET_OPTIONS
4158 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4160 const char *str = *target_options[i].variable;
4164 l = strlen (str) + 1;
4165 if (len < l || memcmp (data, str, l) != 0)
4167 flag_that_differs = target_options[i].prefix;
4180 asprintf (&r, _("created and used with differing settings of `-m%s'"),
4183 return _("out of memory");
4188 /* Default tree printer. Handles declarations only. */
4190 default_tree_printer (pretty_printer * pp, text_info *text)
4192 switch (*text->format_spec)
4198 tree t = va_arg (*text->args_ptr, tree);
4199 const char *n = DECL_NAME (t)
4200 ? (*lang_hooks.decl_printable_name) (t, 2)
4211 /* Initialization of the front end environment, before command line
4212 options are parsed. Signal handlers, internationalization etc.
4213 ARGV0 is main's argv[0]. */
4215 general_init (const char *argv0)
4219 p = argv0 + strlen (argv0);
4220 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4224 xmalloc_set_program_name (progname);
4228 gcc_init_libintl ();
4230 /* Initialize the diagnostics reporting machinery, so option parsing
4231 can give warnings and errors. */
4232 diagnostic_initialize (global_dc);
4233 /* Set a default printer. Language specific initializations will
4234 override it later. */
4235 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4237 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4239 signal (SIGSEGV, crash_signal);
4242 signal (SIGILL, crash_signal);
4245 signal (SIGBUS, crash_signal);
4248 signal (SIGABRT, crash_signal);
4250 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4251 signal (SIGIOT, crash_signal);
4254 signal (SIGFPE, crash_signal);
4257 /* Other host-specific signal setup. */
4258 (*host_hooks.extra_signals)();
4260 /* Initialize the garbage-collector, string pools and tree type hash
4266 /* Initialize register usage now so switches may override. */
4269 /* Register the language-independent parameters. */
4270 add_params (lang_independent_params, LAST_PARAM);
4272 /* This must be done after add_params but before argument processing. */
4273 init_ggc_heuristics();
4276 /* Process the options that have been parsed. */
4278 process_options (void)
4280 /* Allow the front end to perform consistency checks and do further
4281 initialization based on the command line options. This hook also
4282 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4283 so we can correctly initialize debug output. */
4284 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4285 input_filename = main_input_filename;
4287 #ifdef OVERRIDE_OPTIONS
4288 /* Some machines may reject certain combinations of options. */
4292 /* Set aux_base_name if not already set. */
4295 else if (main_input_filename)
4297 char *name = xstrdup (lbasename (main_input_filename));
4299 strip_off_ending (name, strlen (name));
4300 aux_base_name = name;
4303 aux_base_name = "gccaux";
4305 /* Set up the align_*_log variables, defaulting them to 1 if they
4306 were still unset. */
4307 if (align_loops <= 0) align_loops = 1;
4308 if (align_loops_max_skip > align_loops || !align_loops)
4309 align_loops_max_skip = align_loops - 1;
4310 align_loops_log = floor_log2 (align_loops * 2 - 1);
4311 if (align_jumps <= 0) align_jumps = 1;
4312 if (align_jumps_max_skip > align_jumps || !align_jumps)
4313 align_jumps_max_skip = align_jumps - 1;
4314 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4315 if (align_labels <= 0) align_labels = 1;
4316 align_labels_log = floor_log2 (align_labels * 2 - 1);
4317 if (align_labels_max_skip > align_labels || !align_labels)
4318 align_labels_max_skip = align_labels - 1;
4319 if (align_functions <= 0) align_functions = 1;
4320 align_functions_log = floor_log2 (align_functions * 2 - 1);
4322 /* Unrolling all loops implies that standard loop unrolling must also
4324 if (flag_unroll_all_loops)
4325 flag_unroll_loops = 1;
4327 if (flag_unroll_loops)
4329 flag_old_unroll_loops = 0;
4330 flag_old_unroll_all_loops = 0;
4333 if (flag_old_unroll_all_loops)
4334 flag_old_unroll_loops = 1;
4336 /* Old loop unrolling requires that strength_reduction be on also. Silently
4337 turn on strength reduction here if it isn't already on. Also, the loop
4338 unrolling code assumes that cse will be run after loop, so that must
4339 be turned on also. */
4340 if (flag_old_unroll_loops)
4342 flag_strength_reduce = 1;
4343 flag_rerun_cse_after_loop = 1;
4345 if (flag_unroll_loops || flag_peel_loops)
4346 flag_rerun_cse_after_loop = 1;
4348 if (flag_non_call_exceptions)
4349 flag_asynchronous_unwind_tables = 1;
4350 if (flag_asynchronous_unwind_tables)
4351 flag_unwind_tables = 1;
4353 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4355 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4356 flag_unit_at_a_time = 0;
4358 if (flag_value_profile_transformations)
4359 flag_profile_values = 1;
4361 /* Warn about options that are not supported on this machine. */
4362 #ifndef INSN_SCHEDULING
4363 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4364 warning ("instruction scheduling not supported on this target machine");
4367 if (flag_delayed_branch)
4368 warning ("this target machine does not have delayed branches");
4371 user_label_prefix = USER_LABEL_PREFIX;
4372 if (flag_leading_underscore != -1)
4374 /* If the default prefix is more complicated than "" or "_",
4375 issue a warning and ignore this option. */
4376 if (user_label_prefix[0] == 0 ||
4377 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4379 user_label_prefix = flag_leading_underscore ? "_" : "";
4382 warning ("-f%sleading-underscore not supported on this target machine",
4383 flag_leading_underscore ? "" : "no-");
4386 /* If we are in verbose mode, write out the version and maybe all the
4387 option flags in use. */
4390 print_version (stderr, "");
4392 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4395 if (flag_syntax_only)
4397 write_symbols = NO_DEBUG;
4401 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4403 if (debug_info_level == DINFO_LEVEL_NONE)
4404 write_symbols = NO_DEBUG;
4406 /* Now we know write_symbols, set up the debug hooks based on it.
4407 By default we do nothing for debug output. */
4408 if (write_symbols == NO_DEBUG)
4409 debug_hooks = &do_nothing_debug_hooks;
4410 #if defined(DBX_DEBUGGING_INFO)
4411 else if (write_symbols == DBX_DEBUG)
4412 debug_hooks = &dbx_debug_hooks;
4414 #if defined(XCOFF_DEBUGGING_INFO)
4415 else if (write_symbols == XCOFF_DEBUG)
4416 debug_hooks = &xcoff_debug_hooks;
4418 #ifdef SDB_DEBUGGING_INFO
4419 else if (write_symbols == SDB_DEBUG)
4420 debug_hooks = &sdb_debug_hooks;
4422 #ifdef DWARF2_DEBUGGING_INFO
4423 else if (write_symbols == DWARF2_DEBUG)
4424 debug_hooks = &dwarf2_debug_hooks;
4426 #ifdef VMS_DEBUGGING_INFO
4427 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4428 debug_hooks = &vmsdbg_debug_hooks;
4431 error ("target system does not support the \"%s\" debug format",
4432 debug_type_names[write_symbols]);
4434 /* If auxiliary info generation is desired, open the output file.
4435 This goes in the same directory as the source file--unlike
4436 all the other output files. */
4437 if (flag_gen_aux_info)
4439 aux_info_file = fopen (aux_info_file_name, "w");
4440 if (aux_info_file == 0)
4441 fatal_error ("can't open %s: %m", aux_info_file_name);
4444 if (! targetm.have_named_sections)
4446 if (flag_function_sections)
4448 warning ("-ffunction-sections not supported for this target");
4449 flag_function_sections = 0;
4451 if (flag_data_sections)
4453 warning ("-fdata-sections not supported for this target");
4454 flag_data_sections = 0;
4458 if (flag_function_sections && profile_flag)
4460 warning ("-ffunction-sections disabled; it makes profiling impossible");
4461 flag_function_sections = 0;
4464 #ifndef HAVE_prefetch
4465 if (flag_prefetch_loop_arrays)
4467 warning ("-fprefetch-loop-arrays not supported for this target");
4468 flag_prefetch_loop_arrays = 0;
4471 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4473 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4474 flag_prefetch_loop_arrays = 0;
4478 /* This combination of options isn't handled for i386 targets and doesn't
4479 make much sense anyway, so don't allow it. */
4480 if (flag_prefetch_loop_arrays && optimize_size)
4482 warning ("-fprefetch-loop-arrays is not supported with -Os");
4483 flag_prefetch_loop_arrays = 0;
4486 #ifndef OBJECT_FORMAT_ELF
4487 if (flag_function_sections && write_symbols != NO_DEBUG)
4488 warning ("-ffunction-sections may affect debugging on some targets");
4491 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4492 if (flag_signaling_nans)
4493 flag_trapping_math = 1;
4496 /* Initialize the compiler back end. */
4500 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4501 || debug_info_level == DINFO_LEVEL_VERBOSE
4502 #ifdef VMS_DEBUGGING_INFO
4503 /* Enable line number info for traceback. */
4504 || debug_info_level > DINFO_LEVEL_NONE
4506 || flag_test_coverage
4507 || warn_notreached);
4510 init_fake_stack_mems ();
4514 init_function_once ();
4515 init_varasm_once ();
4517 /* The following initialization functions need to generate rtl, so
4518 provide a dummy function context for them. */
4519 init_dummy_function_start ();
4521 if (flag_caller_saves)
4522 init_caller_save ();
4523 expand_dummy_function_end ();
4526 /* Language-dependent initialization. Returns nonzero on success. */
4528 lang_dependent_init (const char *name)
4530 if (dump_base_name == 0)
4531 dump_base_name = name ? name : "gccdump";
4533 /* Other front-end initialization. */
4534 if ((*lang_hooks.init) () == 0)
4537 init_asm_output (name);
4539 /* These create various _DECL nodes, so need to be called after the
4540 front end is initialized. */
4544 /* The following initialization functions need to generate rtl, so
4545 provide a dummy function context for them. */
4546 init_dummy_function_start ();
4548 expand_dummy_function_end ();
4550 /* If dbx symbol table desired, initialize writing it and output the
4551 predefined types. */
4552 timevar_push (TV_SYMOUT);
4554 #ifdef DWARF2_UNWIND_INFO
4555 if (dwarf2out_do_frame ())
4556 dwarf2out_frame_init ();
4559 /* Now we have the correct original filename, we can initialize
4561 (*debug_hooks->init) (name);
4563 timevar_pop (TV_SYMOUT);
4568 /* Clean up: close opened files, etc. */
4573 /* Close the dump files. */
4574 if (flag_gen_aux_info)
4576 fclose (aux_info_file);
4578 unlink (aux_info_file_name);
4581 /* Close non-debugging input and output files. Take special care to note
4582 whether fclose returns an error, since the pages might still be on the
4583 buffer chain while the file is open. */
4587 if (ferror (asm_out_file) != 0)
4588 fatal_error ("error writing to %s: %m", asm_file_name);
4589 if (fclose (asm_out_file) != 0)
4590 fatal_error ("error closing %s: %m", asm_file_name);
4593 /* Do whatever is necessary to finish printing the graphs. */
4594 if (graph_dump_format != no_graph)
4598 for (i = 0; i < (int) DFI_MAX; ++i)
4599 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4604 sprintf (seq, DUMPFILE_FORMAT, i);
4605 suffix = concat (seq, dump_file[i].extension, NULL);
4606 finish_graph_dump_file (dump_base_name, suffix);
4613 ggc_print_statistics ();
4614 stringpool_statistics ();
4615 dump_tree_statistics ();
4616 dump_rtx_statistics ();
4617 dump_varray_statistics ();
4618 dump_alloc_pool_statistics ();
4621 /* Free up memory for the benefit of leak detectors. */
4624 /* Language-specific end of compilation actions. */
4625 (*lang_hooks.finish) ();
4628 /* Initialize the compiler, and compile the input file. */
4632 /* Initialize timing first. The C front ends read the main file in
4633 the post_options hook, and C++ does file timings. */
4634 if (time_report || !quiet_flag || flag_detailed_statistics)
4636 timevar_start (TV_TOTAL);
4640 /* Don't do any more if an error has already occurred. */
4643 /* This must be run always, because it is needed to compute the FP
4644 predefined macros, such as __LDBL_MAX__, for targets using non
4645 default FP formats. */
4646 init_adjust_machine_modes ();
4648 /* Set up the back-end if requested. */
4652 /* Language-dependent initialization. Returns true on success. */
4653 if (lang_dependent_init (main_input_filename))
4655 if (flag_unit_at_a_time)
4657 open_dump_file (DFI_cgraph, NULL);
4658 cgraph_dump_file = rtl_dump_file;
4659 rtl_dump_file = NULL;
4664 if (flag_unit_at_a_time)
4666 rtl_dump_file = cgraph_dump_file;
4667 cgraph_dump_file = NULL;
4668 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4675 /* Stop timing and print the times. */
4676 timevar_stop (TV_TOTAL);
4677 timevar_print (stderr);
4680 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4681 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4682 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4684 It is not safe to call this function more than once. */
4687 toplev_main (unsigned int argc, const char **argv)
4691 /* Initialization of GCC's environment, and diagnostics. */
4692 general_init (argv[0]);
4694 /* Parse the options and do minimal processing; basically just
4695 enough to default flags appropriately. */
4696 decode_options (argc, argv);
4700 /* Exit early if we can (e.g. -help). */
4701 if (!exit_after_options)
4704 if (errorcount || sorrycount)
4705 return (FATAL_EXIT_CODE);
4707 return (SUCCESS_EXIT_CODE);