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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static rtx rest_of_handle_ssa (tree, rtx);
128 static void rest_of_handle_cse (tree, rtx);
129 static void rest_of_handle_cse2 (tree, rtx);
130 static void rest_of_handle_gcse (tree, rtx);
131 static void rest_of_handle_life (tree, rtx);
132 static void rest_of_handle_loop_optimize (tree, rtx);
133 static void rest_of_handle_loop2 (tree, rtx);
134 static void rest_of_handle_jump_bypass (tree, rtx);
135 static void rest_of_handle_sibling_calls (rtx);
136 static void rest_of_handle_null_pointer (tree, rtx);
137 static void rest_of_handle_addressof (tree, rtx);
138 static void rest_of_handle_cfg (tree, rtx);
139 static void rest_of_handle_branch_prob (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx, int *);
150 static bool rest_of_handle_old_regalloc (tree, rtx, int *);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
285 DFI_branch_target_load,
293 /* Describes all the dump files. Should be kept in order of the
294 pass and in sync with dump_file_index above.
296 Remaining -d letters:
302 static struct dump_file_info dump_file[DFI_MAX] =
304 { "cgraph", 'U', 0, 0, 0 },
305 { "rtl", 'r', 0, 0, 0 },
306 { "sibling", 'i', 0, 0, 0 },
307 { "eh", 'h', 0, 0, 0 },
308 { "jump", 'j', 0, 0, 0 },
309 { "ssa", 'e', 1, 0, 0 },
310 { "ssaccp", 'W', 1, 0, 0 },
311 { "ssadce", 'X', 1, 0, 0 },
312 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
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 { "ce1", 'C', 1, 0, 0 },
322 { "tracer", 'T', 1, 0, 0 },
323 { "web", 'Z', 0, 0, 0 },
324 { "loop2", 'L', 1, 0, 0 },
325 { "cse2", 't', 1, 0, 0 },
326 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
327 { "combine", 'c', 1, 0, 0 },
328 { "ce2", 'C', 1, 0, 0 },
329 { "regmove", 'N', 1, 0, 0 },
330 { "sched", 'S', 1, 0, 0 },
331 { "lreg", 'l', 1, 0, 0 },
332 { "greg", 'g', 1, 0, 0 },
333 { "postreload", 'o', 1, 0, 0 },
334 { "flow2", 'w', 1, 0, 0 },
335 { "peephole2", 'z', 1, 0, 0 },
336 { "rnreg", 'n', 1, 0, 0 },
337 { "bbro", 'B', 1, 0, 0 },
338 { "ce3", 'E', 1, 0, 0 },
339 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
340 { "sched2", 'R', 1, 0, 0 },
341 { "stack", 'k', 1, 0, 0 },
342 { "mach", 'M', 1, 0, 0 },
343 { "dbr", 'd', 0, 0, 0 },
346 static int open_dump_file (enum dump_file_index, tree);
347 static void close_dump_file (enum dump_file_index,
348 void (*) (FILE *, rtx), rtx);
350 /* Other flags saying which kinds of debugging dump have been requested. */
352 int rtl_dump_and_exit;
353 int flag_print_asm_name;
354 enum graph_dump_types graph_dump_format;
356 /* Name for output file of assembly code, specified with -o. */
358 const char *asm_file_name;
360 /* Nonzero means do optimizations. -O.
361 Particular numeric values stand for particular amounts of optimization;
362 thus, -O2 stores 2 here. However, the optimizations beyond the basic
363 ones are not controlled directly by this variable. Instead, they are
364 controlled by individual `flag_...' variables that are defaulted
365 based on this variable. */
369 /* Nonzero means optimize for size. -Os.
370 The only valid values are zero and nonzero. When optimize_size is
371 nonzero, optimize defaults to 2, but certain individual code
372 bloating optimizations are disabled. */
374 int optimize_size = 0;
376 /* The FUNCTION_DECL for the function currently being compiled,
377 or 0 if between functions. */
378 tree current_function_decl;
380 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
382 tree current_function_func_begin_label;
384 /* Nonzero if doing dwarf2 duplicate elimination. */
386 int flag_eliminate_dwarf2_dups = 0;
388 /* Nonzero if doing unused type elimination. */
390 int flag_eliminate_unused_debug_types = 1;
392 /* Nonzero means emit debugging information only for symbols which are used. */
393 int flag_debug_only_used_symbols = 0;
395 /* Nonzero if generating code to do profiling. */
397 int profile_flag = 0;
399 /* Nonzero if generating code to profile program flow graph arcs. */
401 int profile_arc_flag = 0;
403 /* Nonzero if value histograms should be measured. */
405 int flag_profile_values = 0;
407 /* Nonzero if generating info for gcov to calculate line test coverage. */
409 int flag_test_coverage = 0;
411 /* Nonzero indicates that branch taken probabilities should be calculated. */
413 int flag_branch_probabilities = 0;
415 /* Nonzero if basic blocks should be reordered. */
417 int flag_reorder_blocks = 0;
419 /* Nonzero if functions should be reordered. */
421 int flag_reorder_functions = 0;
423 /* Nonzero if registers should be renamed. */
425 int flag_rename_registers = 0;
426 int flag_cprop_registers = 0;
428 /* Nonzero for -pedantic switch: warn about anything
429 that standard spec forbids. */
433 /* Temporarily suppress certain warnings.
434 This is set while reading code from a system header file. */
436 int in_system_header = 0;
438 /* Don't print functions as they are compiled. -quiet. */
442 /* Print times taken by the various passes. -ftime-report. */
446 /* Print memory still in use at end of compilation (which may have little
447 to do with peak memory consumption). -fmem-report. */
451 /* Nonzero means to collect statistics which might be expensive
452 and to print them when we are done. */
453 int flag_detailed_statistics = 0;
455 /* A random sequence of characters, unless overridden by user. */
456 const char *flag_random_seed;
458 /* A local time stamp derived from the time of compilation. It will be
459 zero if the system cannot provide a time. It will be -1u, if the
460 user has specified a particular random seed. */
465 /* Nonzero means `char' should be signed. */
467 int flag_signed_char;
469 /* Nonzero means give an enum type only as many bytes as it needs. */
471 int flag_short_enums;
473 /* Nonzero for -fcaller-saves: allocate values in regs that need to
474 be saved across function calls, if that produces overall better code.
475 Optional now, so people can test it. */
477 #ifdef DEFAULT_CALLER_SAVES
478 int flag_caller_saves = 1;
480 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 /* -fgnu-linker specifies use of the GNU linker for initializations.
889 (Or, more generally, a linker that handles initializations.)
890 -fno-gnu-linker says that collect2 will be used. */
892 int flag_gnu_linker = 0;
894 int flag_gnu_linker = 1;
897 /* Nonzero means put zero initialized data in the bss section. */
898 int flag_zero_initialized_in_bss = 1;
903 /* Enable ssa conditional constant propagation. */
904 int flag_ssa_ccp = 0;
906 /* Enable ssa aggressive dead code elimination. */
907 int flag_ssa_dce = 0;
909 /* Tag all structures with __attribute__(packed). */
910 int flag_pack_struct = 0;
912 /* Emit code to check for stack overflow; also may cause large objects
913 to be allocated dynamically. */
914 int flag_stack_check;
916 /* When non-NULL, indicates that whenever space is allocated on the
917 stack, the resulting stack pointer must not pass this
918 address---that is, for stacks that grow downward, the stack pointer
919 must always be greater than or equal to this address; for stacks
920 that grow upward, the stack pointer must be less than this address.
921 At present, the rtx may be either a REG or a SYMBOL_REF, although
922 the support provided depends on the backend. */
925 /* 0 if pointer arguments may alias each other. True in C.
926 1 if pointer arguments may not alias each other but may alias
928 2 if pointer arguments may not alias each other and may not
929 alias global variables. True in Fortran.
930 This defaults to 0 for C. */
931 int flag_argument_noalias = 0;
933 /* Nonzero if we should do (language-dependent) alias analysis.
934 Typically, this analysis will assume that expressions of certain
935 types do not alias expressions of certain other types. Only used
936 if alias analysis (in general) is enabled. */
937 int flag_strict_aliasing = 0;
939 /* Instrument functions with calls at entry and exit, for profiling. */
940 int flag_instrument_function_entry_exit = 0;
942 /* Nonzero means ignore `#ident' directives. 0 means handle them.
943 On SVR4 targets, it also controls whether or not to emit a
944 string identifying the compiler. */
946 int flag_no_ident = 0;
948 /* This will perform a peephole pass before sched2. */
949 int flag_peephole2 = 0;
951 /* This will try to guess branch probabilities. */
952 int flag_guess_branch_prob = 0;
954 /* -fcheck-bounds causes gcc to generate array bounds checks.
955 For C, C++, ObjC: defaults to off.
956 For Java: defaults to on.
957 For Fortran: defaults to off. */
958 int flag_bounds_check = 0;
960 /* This will attempt to merge constant section constants, if 1 only
961 string constants and constants from constant pool, if 2 also constant
963 int flag_merge_constants = 1;
965 /* If one, renumber instruction UIDs to reduce the number of
966 unused UIDs if there are a lot of instructions. If greater than
967 one, unconditionally renumber instruction UIDs. */
968 int flag_renumber_insns = 1;
970 /* If nonzero, use the graph coloring register allocator. */
971 int flag_new_regalloc = 0;
973 /* Nonzero if we perform superblock formation. */
977 /* Nonzero if we perform whole unit at a time compilation. */
979 int flag_unit_at_a_time = 0;
981 /* Values of the -falign-* flags: how much to align labels in code.
982 0 means `use default', 1 means `don't align'.
983 For each variable, there is an _log variant which is the power
984 of two not less than the variable, for .align output. */
988 int align_loops_max_skip;
991 int align_jumps_max_skip;
993 int align_labels_log;
994 int align_labels_max_skip;
996 int align_functions_log;
998 /* Like align_functions_log above, but used by front-ends to force the
999 minimum function alignment. Zero means no alignment is forced. */
1000 int force_align_functions_log;
1004 const char *const string;
1005 int *const variable;
1008 lang_independent_options;
1010 /* Nonzero if signed arithmetic overflow should trap. */
1013 /* Nonzero if signed arithmetic overflow should wrap around. */
1016 /* Nonzero if subexpressions must be evaluated from left-to-right. */
1017 int flag_evaluation_order = 0;
1019 /* Add or remove a leading underscore from user symbols. */
1020 int flag_leading_underscore = -1;
1022 /* The user symbol prefix after having resolved same. */
1023 const char *user_label_prefix;
1025 static const param_info lang_independent_params[] = {
1026 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1027 { OPTION, DEFAULT, HELP },
1028 #include "params.def"
1033 /* Table of language-independent -f options.
1034 STRING is the option name. VARIABLE is the address of the variable.
1035 ON_VALUE is the value to store in VARIABLE
1036 if `-fSTRING' is seen as an option.
1037 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1039 static const lang_independent_options f_options[] =
1041 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1042 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1043 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1044 {"float-store", &flag_float_store, 1 },
1045 {"defer-pop", &flag_defer_pop, 1 },
1046 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1047 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1048 {"tracer", &flag_tracer, 1 },
1049 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1050 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1051 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1052 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1053 {"thread-jumps", &flag_thread_jumps, 1 },
1054 {"strength-reduce", &flag_strength_reduce, 1 },
1055 {"unroll-loops", &flag_unroll_loops, 1 },
1056 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1057 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1058 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1059 {"peel-loops", &flag_peel_loops, 1 },
1060 {"unswitch-loops", &flag_unswitch_loops, 1 },
1061 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1062 {"move-all-movables", &flag_move_all_movables, 1 },
1063 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1064 {"writable-strings", &flag_writable_strings, 1 },
1065 {"peephole", &flag_no_peephole, 0 },
1066 {"force-mem", &flag_force_mem, 1 },
1067 {"force-addr", &flag_force_addr, 1 },
1068 {"function-cse", &flag_no_function_cse, 0 },
1069 {"inline-functions", &flag_inline_functions, 1 },
1070 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1071 {"inline", &flag_no_inline, 0 },
1072 {"keep-static-consts", &flag_keep_static_consts, 1 },
1073 {"syntax-only", &flag_syntax_only, 1 },
1074 {"shared-data", &flag_shared_data, 1 },
1075 {"caller-saves", &flag_caller_saves, 1 },
1076 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1077 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1078 {"delayed-branch", &flag_delayed_branch, 1 },
1079 {"web", &flag_web, 1},
1080 {"gcse", &flag_gcse, 1 },
1081 {"gcse-lm", &flag_gcse_lm, 1 },
1082 {"gcse-sm", &flag_gcse_sm, 1 },
1083 {"gcse-las", &flag_gcse_las, 1 },
1084 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1085 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1086 {"loop-optimize", &flag_loop_optimize, 1 },
1087 {"crossjumping", &flag_crossjumping, 1 },
1088 {"if-conversion", &flag_if_conversion, 1 },
1089 {"if-conversion2", &flag_if_conversion2, 1 },
1090 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1091 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1092 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1093 {"schedule-insns", &flag_schedule_insns, 1 },
1094 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1095 {"sched-interblock",&flag_schedule_interblock, 1 },
1096 {"sched-spec",&flag_schedule_speculative, 1 },
1097 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1098 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1099 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1100 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1101 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1102 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1103 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1104 {"pic", &flag_pic, 1 },
1105 {"PIC", &flag_pic, 2 },
1106 {"pie", &flag_pie, 1 },
1107 {"PIE", &flag_pie, 2 },
1108 {"exceptions", &flag_exceptions, 1 },
1109 {"unwind-tables", &flag_unwind_tables, 1 },
1110 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1111 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1112 {"profile-arcs", &profile_arc_flag, 1 },
1113 {"test-coverage", &flag_test_coverage, 1 },
1114 {"branch-probabilities", &flag_branch_probabilities, 1 },
1115 {"profile", &profile_flag, 1 },
1116 {"reorder-blocks", &flag_reorder_blocks, 1 },
1117 {"reorder-functions", &flag_reorder_functions, 1 },
1118 {"rename-registers", &flag_rename_registers, 1 },
1119 {"cprop-registers", &flag_cprop_registers, 1 },
1120 {"common", &flag_no_common, 0 },
1121 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1122 {"function-sections", &flag_function_sections, 1 },
1123 {"data-sections", &flag_data_sections, 1 },
1124 {"verbose-asm", &flag_verbose_asm, 1 },
1125 {"gnu-linker", &flag_gnu_linker, 1 },
1126 {"regmove", &flag_regmove, 1 },
1127 {"optimize-register-move", &flag_regmove, 1 },
1128 {"pack-struct", &flag_pack_struct, 1 },
1129 {"stack-check", &flag_stack_check, 1 },
1130 {"argument-alias", &flag_argument_noalias, 0 },
1131 {"argument-noalias", &flag_argument_noalias, 1 },
1132 {"argument-noalias-global", &flag_argument_noalias, 2 },
1133 {"strict-aliasing", &flag_strict_aliasing, 1 },
1134 {"align-loops", &align_loops, 0 },
1135 {"align-jumps", &align_jumps, 0 },
1136 {"align-labels", &align_labels, 0 },
1137 {"align-functions", &align_functions, 0 },
1138 {"merge-constants", &flag_merge_constants, 1 },
1139 {"merge-all-constants", &flag_merge_constants, 2 },
1140 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1141 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1142 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1143 {"ssa", &flag_ssa, 1 },
1144 {"ssa-ccp", &flag_ssa_ccp, 1 },
1145 {"ssa-dce", &flag_ssa_dce, 1 },
1146 {"leading-underscore", &flag_leading_underscore, 1 },
1147 {"ident", &flag_no_ident, 0 },
1148 { "peephole2", &flag_peephole2, 1 },
1149 {"finite-math-only", &flag_finite_math_only, 1 },
1150 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1151 {"math-errno", &flag_errno_math, 1 },
1152 {"trapping-math", &flag_trapping_math, 1 },
1153 {"rounding-math", &flag_rounding_math, 1 },
1154 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1155 {"signaling-nans", &flag_signaling_nans, 1 },
1156 {"bounds-check", &flag_bounds_check, 1 },
1157 {"single-precision-constant", &flag_single_precision_constant, 1 },
1158 {"time-report", &time_report, 1 },
1159 {"mem-report", &mem_report, 1 },
1160 { "trapv", &flag_trapv, 1 },
1161 { "wrapv", &flag_wrapv, 1 },
1162 { "new-ra", &flag_new_regalloc, 1 }
1165 /* Here is a table, controlled by the tm.h file, listing each -m switch
1166 and which bits in `target_switches' it should set or clear.
1167 If VALUE is positive, it is bits to set.
1168 If VALUE is negative, -VALUE is bits to clear.
1169 (The sign bit is not used so there is no confusion.) */
1173 const char *const name;
1175 const char *const description;
1177 target_switches[] = TARGET_SWITCHES;
1179 /* This table is similar, but allows the switch to have a value. */
1181 #ifdef TARGET_OPTIONS
1184 const char *const prefix;
1185 const char **const variable;
1186 const char *const description;
1187 const char *const value;
1189 target_options[] = TARGET_OPTIONS;
1192 /* Nonzero means warn about function definitions that default the return type
1193 or that use a null return and have a return-type other than void. */
1195 int warn_return_type;
1197 /* Output files for assembler code (real compiler output)
1198 and debugging dumps. */
1201 FILE *aux_info_file;
1202 FILE *rtl_dump_file = NULL;
1203 FILE *cgraph_dump_file = NULL;
1205 /* The current working directory of a translation. It's generally the
1206 directory from which compilation was initiated, but a preprocessed
1207 file may specify the original directory in which it was
1210 static const char *src_pwd;
1212 /* Initialize src_pwd with the given string, and return true. If it
1213 was already initialized, return false. As a special case, it may
1214 be called with a NULL argument to test whether src_pwd has NOT been
1218 set_src_pwd (const char *pwd)
1223 src_pwd = xstrdup (pwd);
1227 /* Return the directory from which the translation unit was initiated,
1228 in case set_src_pwd() was not called before to assign it a
1235 src_pwd = getpwd ();
1240 /* Called when the start of a function definition is parsed,
1241 this function prints on stderr the name of the function. */
1243 announce_function (tree decl)
1247 if (rtl_dump_and_exit)
1248 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1250 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1252 pp_needs_newline (global_dc->printer) = true;
1253 diagnostic_set_last_function (global_dc);
1257 /* Set up a default flag_random_seed and local_tick, unless the user
1258 already specified one. */
1263 if (!flag_random_seed)
1265 unsigned HOST_WIDE_INT value;
1266 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1268 /* Get some more or less random data. */
1269 #ifdef HAVE_GETTIMEOFDAY
1273 gettimeofday (&tv, NULL);
1274 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1278 time_t now = time (NULL);
1280 if (now != (time_t)-1)
1281 local_tick = (unsigned) now;
1284 value = local_tick ^ getpid ();
1286 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1287 flag_random_seed = random_seed;
1289 else if (!local_tick)
1294 /* Decode the string P as an integral parameter.
1295 If the string is indeed an integer return its numeric value else
1296 issue an Invalid Option error for the option PNAME and return DEFVAL.
1297 If PNAME is zero just return DEFVAL, do not call error. */
1300 read_integral_parameter (const char *p, const char *pname, const int defval)
1302 const char *endp = p;
1306 if (ISDIGIT (*endp))
1315 error ("invalid option argument `%s'", pname);
1322 /* Return the logarithm of X, base 2, considering X unsigned,
1323 if X is a power of 2. Otherwise, returns -1.
1325 This should be used via the `exact_log2' macro. */
1328 exact_log2_wide (unsigned HOST_WIDE_INT x)
1331 /* Test for 0 or a power of 2. */
1332 if (x == 0 || x != (x & -x))
1334 while ((x >>= 1) != 0)
1339 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1340 If X is 0, return -1.
1342 This should be used via the floor_log2 macro. */
1345 floor_log2_wide (unsigned HOST_WIDE_INT x)
1354 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1355 into ICE messages, which is much more user friendly. In case the
1356 error printer crashes, reset the signal to prevent infinite recursion. */
1359 crash_signal (int signo)
1361 signal (signo, SIG_DFL);
1362 internal_error ("%s", strsignal (signo));
1365 /* Arrange to dump core on error. (The regular error message is still
1366 printed first, except in the case of abort().) */
1369 setup_core_dumping (void)
1372 signal (SIGABRT, SIG_DFL);
1374 #if defined(HAVE_SETRLIMIT)
1377 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1378 fatal_error ("getting core file size maximum limit: %m");
1379 rlim.rlim_cur = rlim.rlim_max;
1380 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1381 fatal_error ("setting core file size limit to maximum: %m");
1384 diagnostic_abort_on_error (global_dc);
1388 /* Strip off a legitimate source ending from the input string NAME of
1389 length LEN. Rather than having to know the names used by all of
1390 our front ends, we strip off an ending of a period followed by
1391 up to five characters. (Java uses ".class".) */
1394 strip_off_ending (char *name, int len)
1397 for (i = 2; i < 6 && len > i; i++)
1399 if (name[len - i] == '.')
1401 name[len - i] = '\0';
1407 /* Output a quoted string. */
1410 output_quoted_string (FILE *asm_file, const char *string)
1412 #ifdef OUTPUT_QUOTED_STRING
1413 OUTPUT_QUOTED_STRING (asm_file, string);
1417 putc ('\"', asm_file);
1418 while ((c = *string++) != 0)
1422 if (c == '\"' || c == '\\')
1423 putc ('\\', asm_file);
1427 fprintf (asm_file, "\\%03o", (unsigned char) c);
1429 putc ('\"', asm_file);
1433 /* Output a file name in the form wanted by System V. */
1436 output_file_directive (FILE *asm_file, const char *input_name)
1438 int len = strlen (input_name);
1439 const char *na = input_name + len;
1441 /* NA gets INPUT_NAME sans directory names. */
1442 while (na > input_name)
1444 if (IS_DIR_SEPARATOR (na[-1]))
1449 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1450 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1452 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1453 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1455 fprintf (asm_file, "\t.file\t");
1456 output_quoted_string (asm_file, na);
1457 fputc ('\n', asm_file);
1462 /* Routine to open a dump file. Return true if the dump file is enabled. */
1465 open_dump_file (enum dump_file_index index, tree decl)
1468 const char *open_arg;
1471 if (! dump_file[index].enabled)
1474 timevar_push (TV_DUMP);
1475 if (rtl_dump_file != NULL)
1476 fclose (rtl_dump_file);
1478 sprintf (seq, DUMPFILE_FORMAT, index);
1480 if (! dump_file[index].initialized)
1482 /* If we've not initialized the files, do so now. */
1483 if (graph_dump_format != no_graph
1484 && dump_file[index].graph_dump_p)
1486 dump_name = concat (seq, dump_file[index].extension, NULL);
1487 clean_graph_dump_file (dump_base_name, dump_name);
1490 dump_file[index].initialized = 1;
1496 dump_name = concat (dump_base_name, seq,
1497 dump_file[index].extension, NULL);
1499 rtl_dump_file = fopen (dump_name, open_arg);
1500 if (rtl_dump_file == NULL)
1501 fatal_error ("can't open %s: %m", dump_name);
1506 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1507 (*lang_hooks.decl_printable_name) (decl, 2),
1508 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1510 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1511 ? " (unlikely executed)"
1514 timevar_pop (TV_DUMP);
1518 /* Routine to close a dump file. */
1521 close_dump_file (enum dump_file_index index,
1522 void (*func) (FILE *, rtx),
1525 if (! rtl_dump_file)
1528 timevar_push (TV_DUMP);
1530 && graph_dump_format != no_graph
1531 && dump_file[index].graph_dump_p)
1536 sprintf (seq, DUMPFILE_FORMAT, index);
1537 suffix = concat (seq, dump_file[index].extension, NULL);
1538 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1543 func (rtl_dump_file, insns);
1545 fflush (rtl_dump_file);
1546 fclose (rtl_dump_file);
1548 rtl_dump_file = NULL;
1549 timevar_pop (TV_DUMP);
1552 /* Do any final processing required for the declarations in VEC, of
1553 which there are LEN. We write out inline functions and variables
1554 that have been deferred until this point, but which are required.
1555 Returns nonzero if anything was put out. */
1558 wrapup_global_declarations (tree *vec, int len)
1563 int output_something = 0;
1565 for (i = 0; i < len; i++)
1569 /* We're not deferring this any longer. Assignment is
1570 conditional to avoid needlessly dirtying PCH pages. */
1571 if (DECL_DEFER_OUTPUT (decl) != 0)
1572 DECL_DEFER_OUTPUT (decl) = 0;
1574 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1575 (*lang_hooks.finish_incomplete_decl) (decl);
1578 /* Now emit any global variables or functions that we have been
1579 putting off. We need to loop in case one of the things emitted
1580 here references another one which comes earlier in the list. */
1584 for (i = 0; i < len; i++)
1588 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1591 /* Don't write out static consts, unless we still need them.
1593 We also keep static consts if not optimizing (for debugging),
1594 unless the user specified -fno-keep-static-consts.
1595 ??? They might be better written into the debug information.
1596 This is possible when using DWARF.
1598 A language processor that wants static constants to be always
1599 written out (even if it is not used) is responsible for
1600 calling rest_of_decl_compilation itself. E.g. the C front-end
1601 calls rest_of_decl_compilation from finish_decl.
1602 One motivation for this is that is conventional in some
1603 environments to write things like:
1604 static const char rcsid[] = "... version string ...";
1605 intending to force the string to be in the executable.
1607 A language processor that would prefer to have unneeded
1608 static constants "optimized away" would just defer writing
1609 them out until here. E.g. C++ does this, because static
1610 constants are often defined in header files.
1612 ??? A tempting alternative (for both C and C++) would be
1613 to force a constant to be written if and only if it is
1614 defined in a main file, as opposed to an include file. */
1616 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1620 if (flag_unit_at_a_time
1621 && cgraph_varpool_node (decl)->finalized)
1623 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1624 && (TREE_USED (decl)
1625 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1627 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1629 else if (DECL_COMDAT (decl))
1631 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1632 && (optimize || !flag_keep_static_consts
1633 || DECL_ARTIFICIAL (decl)))
1639 rest_of_decl_compilation (decl, NULL, 1, 1);
1643 if (TREE_CODE (decl) == FUNCTION_DECL
1644 && DECL_INITIAL (decl) != 0
1645 && DECL_SAVED_INSNS (decl) != 0
1646 && DECL_SAVED_INSNS (decl)->saved_for_inline
1647 && (flag_keep_inline_functions
1648 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1649 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1652 output_inline_function (decl);
1657 output_something = 1;
1661 return output_something;
1664 /* Issue appropriate warnings for the global declarations in VEC (of
1665 which there are LEN). Output debugging information for them. */
1668 check_global_declarations (tree *vec, int len)
1673 for (i = 0; i < len; i++)
1677 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1678 && ! TREE_ASM_WRITTEN (decl))
1679 /* Cancel the RTL for this decl so that, if debugging info
1680 output for global variables is still to come,
1681 this one will be omitted. */
1682 SET_DECL_RTL (decl, NULL_RTX);
1684 /* Warn about any function
1685 declared static but not defined.
1686 We don't warn about variables,
1687 because many programs have static variables
1688 that exist only to get some text into the object file. */
1689 if (TREE_CODE (decl) == FUNCTION_DECL
1690 && (warn_unused_function
1691 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1692 && DECL_INITIAL (decl) == 0
1693 && DECL_EXTERNAL (decl)
1694 && ! DECL_ARTIFICIAL (decl)
1695 && ! TREE_PUBLIC (decl))
1697 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1698 pedwarn ("%J'%F' used but never defined", decl, decl);
1700 warning ("%J'%F' declared `static' but never defined", decl, decl);
1701 /* This symbol is effectively an "extern" declaration now. */
1702 TREE_PUBLIC (decl) = 1;
1703 assemble_external (decl);
1706 /* Warn about static fns or vars defined but not used. */
1707 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1708 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1709 && ! TREE_USED (decl)
1710 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1711 to handle multiple external decls in different scopes. */
1712 && ! TREE_USED (DECL_NAME (decl))
1713 && ! DECL_EXTERNAL (decl)
1714 && ! TREE_PUBLIC (decl)
1715 /* A volatile variable might be used in some non-obvious way. */
1716 && ! TREE_THIS_VOLATILE (decl)
1717 /* Global register variables must be declared to reserve them. */
1718 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1719 /* Otherwise, ask the language. */
1720 && (*lang_hooks.decls.warn_unused_global) (decl))
1721 warning ("%J'%D' defined but not used", decl, decl);
1723 /* Avoid confusing the debug information machinery when there are
1725 if (errorcount == 0 && sorrycount == 0)
1727 timevar_push (TV_SYMOUT);
1728 (*debug_hooks->global_decl) (decl);
1729 timevar_pop (TV_SYMOUT);
1734 /* Warn about a use of an identifier which was marked deprecated. */
1736 warn_deprecated_use (tree node)
1738 if (node == 0 || !warn_deprecated_decl)
1742 warning ("`%s' is deprecated (declared at %s:%d)",
1743 IDENTIFIER_POINTER (DECL_NAME (node)),
1744 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1745 else if (TYPE_P (node))
1747 const char *what = NULL;
1748 tree decl = TYPE_STUB_DECL (node);
1750 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1751 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1752 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1753 && DECL_NAME (TYPE_NAME (node)))
1754 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1759 warning ("`%s' is deprecated (declared at %s:%d)", what,
1760 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1762 warning ("`%s' is deprecated", what);
1765 warning ("type is deprecated (declared at %s:%d)",
1766 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1768 warning ("type is deprecated");
1772 /* Save the current INPUT_LOCATION on the top entry in the
1773 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1774 INPUT_LOCATION accordingly. */
1777 push_srcloc (const char *file, int line)
1779 struct file_stack *fs;
1781 fs = xmalloc (sizeof (struct file_stack));
1782 fs->location = input_location;
1783 fs->next = input_file_stack;
1784 input_filename = file;
1786 input_file_stack = fs;
1787 input_file_stack_tick++;
1790 /* Pop the top entry off the stack of presently open source files.
1791 Restore the INPUT_LOCATION from the new topmost entry on the
1797 struct file_stack *fs;
1799 fs = input_file_stack;
1800 input_location = fs->location;
1801 input_file_stack = fs->next;
1803 input_file_stack_tick++;
1806 /* Compile an entire translation unit. Write a file of assembly
1807 output and various debugging dumps. */
1812 /* Initialize yet another pass. */
1814 init_final (main_input_filename);
1815 coverage_init (aux_base_name);
1817 timevar_push (TV_PARSE);
1819 /* Call the parser, which parses the entire file (calling
1820 rest_of_compilation for each function). */
1821 (*lang_hooks.parse_file) (set_yydebug);
1823 /* In case there were missing block closers,
1824 get us back to the global binding level. */
1825 (*lang_hooks.clear_binding_stack) ();
1827 /* Compilation is now finished except for writing
1828 what's left of the symbol table output. */
1829 timevar_pop (TV_PARSE);
1831 if (flag_syntax_only)
1834 (*lang_hooks.decls.final_write_globals)();
1836 cgraph_varpool_assemble_pending_decls ();
1838 /* This must occur after the loop to output deferred functions.
1839 Else the coverage initializer would not be emitted if all the
1840 functions in this compilation unit were deferred. */
1843 /* Write out any pending weak symbol declarations. */
1847 /* Do dbx symbols. */
1848 timevar_push (TV_SYMOUT);
1850 #ifdef DWARF2_UNWIND_INFO
1851 if (dwarf2out_do_frame ())
1852 dwarf2out_frame_finish ();
1855 (*debug_hooks->finish) (main_input_filename);
1856 timevar_pop (TV_SYMOUT);
1858 /* Output some stuff at end of file if nec. */
1860 dw2_output_indirect_constants ();
1862 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1864 timevar_push (TV_DUMP);
1865 open_dump_file (DFI_bp, NULL);
1869 close_dump_file (DFI_bp, NULL, NULL_RTX);
1870 timevar_pop (TV_DUMP);
1873 targetm.asm_out.file_end ();
1875 /* Attach a special .ident directive to the end of the file to identify
1876 the version of GCC which compiled this code. The format of the .ident
1877 string is patterned after the ones produced by native SVR4 compilers. */
1880 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1881 IDENT_ASM_OP, version_string);
1884 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1886 timevar_push (TV_DUMP);
1887 dump_combine_total_stats (rtl_dump_file);
1888 close_dump_file (DFI_combine, NULL, NULL_RTX);
1889 timevar_pop (TV_DUMP);
1893 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1894 and TYPE_DECL nodes.
1896 This does nothing for local (non-static) variables, unless the
1897 variable is a register variable with an ASMSPEC. In that case, or
1898 if the variable is not an automatic, it sets up the RTL and
1899 outputs any assembler code (label definition, storage allocation
1900 and initialization).
1902 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1903 the assembler symbol name to be used. TOP_LEVEL is nonzero
1904 if this declaration is not within a function. */
1907 rest_of_decl_compilation (tree decl,
1908 const char *asmspec,
1912 /* We deferred calling assemble_alias so that we could collect
1913 other attributes such as visibility. Emit the alias now. */
1916 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1919 alias = TREE_VALUE (TREE_VALUE (alias));
1920 alias = get_identifier (TREE_STRING_POINTER (alias));
1921 assemble_alias (decl, alias);
1925 /* Forward declarations for nested functions are not "external",
1926 but we need to treat them as if they were. */
1927 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1928 || TREE_CODE (decl) == FUNCTION_DECL)
1930 timevar_push (TV_VARCONST);
1933 make_decl_rtl (decl, asmspec);
1935 /* Don't output anything when a tentative file-scope definition
1936 is seen. But at end of compilation, do output code for them. */
1937 if ((at_end || !DECL_DEFER_OUTPUT (decl)) && !DECL_EXTERNAL (decl))
1939 if (flag_unit_at_a_time && !cgraph_global_info_ready
1940 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1941 cgraph_varpool_finalize_decl (decl);
1943 assemble_variable (decl, top_level, at_end, 0);
1946 #ifdef ASM_FINISH_DECLARE_OBJECT
1947 if (decl == last_assemble_variable_decl)
1949 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1954 timevar_pop (TV_VARCONST);
1956 else if (DECL_REGISTER (decl) && asmspec != 0)
1958 if (decode_reg_name (asmspec) >= 0)
1960 SET_DECL_RTL (decl, NULL_RTX);
1961 make_decl_rtl (decl, asmspec);
1965 error ("invalid register name `%s' for register variable", asmspec);
1966 DECL_REGISTER (decl) = 0;
1971 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1972 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1973 && TREE_CODE (decl) == TYPE_DECL)
1975 timevar_push (TV_SYMOUT);
1976 dbxout_symbol (decl, 0);
1977 timevar_pop (TV_SYMOUT);
1980 #ifdef SDB_DEBUGGING_INFO
1981 else if (write_symbols == SDB_DEBUG && top_level
1982 && TREE_CODE (decl) == TYPE_DECL)
1984 timevar_push (TV_SYMOUT);
1985 sdbout_symbol (decl, 0);
1986 timevar_pop (TV_SYMOUT);
1989 #ifdef DWARF2_DEBUGGING_INFO
1990 else if ((write_symbols == DWARF2_DEBUG
1991 || write_symbols == VMS_AND_DWARF2_DEBUG)
1993 && TREE_CODE (decl) == TYPE_DECL)
1995 timevar_push (TV_SYMOUT);
1996 dwarf2out_decl (decl);
1997 timevar_pop (TV_SYMOUT);
2002 /* Called after finishing a record, union or enumeral type. */
2005 rest_of_type_compilation (
2006 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2007 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2011 tree type ATTRIBUTE_UNUSED,
2012 int toplev ATTRIBUTE_UNUSED
2016 /* Avoid confusing the debug information machinery when there are
2018 if (errorcount != 0 || sorrycount != 0)
2021 timevar_push (TV_SYMOUT);
2022 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2023 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2024 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2026 #ifdef SDB_DEBUGGING_INFO
2027 if (write_symbols == SDB_DEBUG)
2028 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2030 #ifdef DWARF2_DEBUGGING_INFO
2031 if ((write_symbols == DWARF2_DEBUG
2032 || write_symbols == VMS_AND_DWARF2_DEBUG)
2034 dwarf2out_decl (TYPE_STUB_DECL (type));
2036 timevar_pop (TV_SYMOUT);
2039 /* Turn the RTL into assembly. */
2041 rest_of_handle_final (tree decl, rtx insns)
2043 timevar_push (TV_FINAL);
2048 /* Get the function's name, as described by its RTL. This may be
2049 different from the DECL_NAME name used in the source file. */
2051 x = DECL_RTL (decl);
2052 if (GET_CODE (x) != MEM)
2055 if (GET_CODE (x) != SYMBOL_REF)
2057 fnname = XSTR (x, 0);
2059 assemble_start_function (decl, fnname);
2060 final_start_function (insns, asm_out_file, optimize);
2061 final (insns, asm_out_file, optimize, 0);
2062 final_end_function ();
2064 #ifdef IA64_UNWIND_INFO
2065 /* ??? The IA-64 ".handlerdata" directive must be issued before
2066 the ".endp" directive that closes the procedure descriptor. */
2067 output_function_exception_table ();
2070 assemble_end_function (decl, fnname);
2072 #ifndef IA64_UNWIND_INFO
2073 /* Otherwise, it feels unclean to switch sections in the middle. */
2074 output_function_exception_table ();
2078 fflush (asm_out_file);
2080 /* Release all memory allocated by flow. */
2081 free_basic_block_vars (0);
2083 /* Release all memory held by regsets now. */
2084 regset_release_memory ();
2086 timevar_pop (TV_FINAL);
2092 /* Run delay slot optimization. */
2094 rest_of_handle_delay_slots (tree decl, rtx insns)
2096 timevar_push (TV_DBR_SCHED);
2097 open_dump_file (DFI_dbr, decl);
2099 dbr_schedule (insns, rtl_dump_file);
2101 close_dump_file (DFI_dbr, print_rtl, insns);
2102 timevar_pop (TV_DBR_SCHED);
2109 /* Convert register usage from flat register file usage to a stack
2112 rest_of_handle_stack_regs (tree decl, rtx insns)
2114 #if defined (HAVE_ATTR_length)
2115 /* If flow2 creates new instructions which need splitting
2116 and scheduling after reload is not done, they might not be
2117 splitten until final which doesn't allow splitting
2118 if HAVE_ATTR_length. */
2119 #ifdef INSN_SCHEDULING
2120 if (optimize && !flag_schedule_insns_after_reload)
2125 timevar_push (TV_SHORTEN_BRANCH);
2126 split_all_insns (1);
2127 timevar_pop (TV_SHORTEN_BRANCH);
2131 timevar_push (TV_REG_STACK);
2132 open_dump_file (DFI_stack, decl);
2134 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2136 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2137 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2138 && flag_reorder_blocks)
2140 reorder_basic_blocks ();
2141 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2145 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2146 timevar_pop (TV_REG_STACK);
2153 /* Machine independent reorg pass. */
2155 rest_of_handle_machine_reorg (tree decl, rtx insns)
2157 timevar_push (TV_MACH_DEP);
2158 open_dump_file (DFI_mach, decl);
2160 (*targetm.machine_dependent_reorg) ();
2162 close_dump_file (DFI_mach, print_rtl, insns);
2163 timevar_pop (TV_MACH_DEP);
2169 /* Run new register allocator. Return TRUE if we must exit
2170 rest_of_compilation upon return. */
2172 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2176 delete_trivially_dead_insns (insns, max_reg_num ());
2179 timevar_pop (TV_LOCAL_ALLOC);
2180 if (dump_file[DFI_lreg].enabled)
2182 timevar_push (TV_DUMP);
2184 close_dump_file (DFI_lreg, NULL, NULL);
2185 timevar_pop (TV_DUMP);
2188 /* XXX clean up the whole mess to bring live info in shape again. */
2189 timevar_push (TV_GLOBAL_ALLOC);
2190 open_dump_file (DFI_greg, decl);
2192 build_insn_chain (insns);
2193 failure = reload (insns, 0);
2195 timevar_pop (TV_GLOBAL_ALLOC);
2197 if (dump_file[DFI_greg].enabled)
2199 timevar_push (TV_DUMP);
2201 dump_global_regs (rtl_dump_file);
2203 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2204 timevar_pop (TV_DUMP);
2210 reload_completed = 1;
2216 /* Run old register allocator. Return TRUE if we must exit
2217 rest_of_compilation upon return. */
2219 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2223 /* Allocate the reg_renumber array. */
2224 allocate_reg_info (max_regno, FALSE, TRUE);
2226 /* And the reg_equiv_memory_loc array. */
2227 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2229 allocate_initial_values (reg_equiv_memory_loc);
2231 regclass (insns, max_reg_num (), rtl_dump_file);
2232 *rebuild_notes = local_alloc ();
2234 timevar_pop (TV_LOCAL_ALLOC);
2236 if (dump_file[DFI_lreg].enabled)
2238 timevar_push (TV_DUMP);
2240 dump_flow_info (rtl_dump_file);
2241 dump_local_alloc (rtl_dump_file);
2243 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2244 timevar_pop (TV_DUMP);
2249 timevar_push (TV_GLOBAL_ALLOC);
2250 open_dump_file (DFI_greg, decl);
2252 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2253 pass fixing up any insns that are invalid. */
2256 failure = global_alloc (rtl_dump_file);
2259 build_insn_chain (insns);
2260 failure = reload (insns, 0);
2263 timevar_pop (TV_GLOBAL_ALLOC);
2265 if (dump_file[DFI_greg].enabled)
2267 timevar_push (TV_DUMP);
2269 dump_global_regs (rtl_dump_file);
2271 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2272 timevar_pop (TV_DUMP);
2278 /* Run the regrename and cprop passes. */
2280 rest_of_handle_regrename (tree decl, rtx insns)
2282 timevar_push (TV_RENAME_REGISTERS);
2283 open_dump_file (DFI_rnreg, decl);
2285 if (flag_rename_registers)
2286 regrename_optimize ();
2287 if (flag_cprop_registers)
2288 copyprop_hardreg_forward ();
2290 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2291 timevar_pop (TV_RENAME_REGISTERS);
2294 /* Reorder basic blocks. */
2296 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2298 timevar_push (TV_REORDER_BLOCKS);
2299 open_dump_file (DFI_bbro, decl);
2301 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2302 splitting possibly introduced more crossjumping opportunities. */
2303 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2304 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2306 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2308 if (flag_reorder_blocks)
2309 reorder_basic_blocks ();
2310 if (flag_reorder_blocks
2311 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2312 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2314 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2315 timevar_pop (TV_REORDER_BLOCKS);
2318 #ifdef INSN_SCHEDULING
2319 /* Run instruction scheduler. */
2321 rest_of_handle_sched (tree decl, rtx insns)
2323 timevar_push (TV_SCHED);
2325 /* Print function header into sched dump now
2326 because doing the sched analysis makes some of the dump. */
2327 if (optimize > 0 && flag_schedule_insns)
2329 open_dump_file (DFI_sched, decl);
2331 /* Do control and data sched analysis,
2332 and write some of the results to dump file. */
2334 schedule_insns (rtl_dump_file);
2336 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2338 timevar_pop (TV_SCHED);
2343 /* Run second scheduling pass after reload. */
2345 rest_of_handle_sched2 (tree decl, rtx insns)
2347 timevar_push (TV_SCHED2);
2348 open_dump_file (DFI_sched2, decl);
2350 /* Do control and data sched analysis again,
2351 and write some more of the results to dump file. */
2353 split_all_insns (1);
2355 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2357 schedule_ebbs (rtl_dump_file);
2358 /* No liveness updating code yet, but it should be easy to do.
2359 reg-stack recompute the liveness when needed for now. */
2360 count_or_remove_death_notes (NULL, 1);
2361 cleanup_cfg (CLEANUP_EXPENSIVE);
2364 schedule_insns (rtl_dump_file);
2366 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2367 timevar_pop (TV_SCHED2);
2373 /* Register allocation pre-pass, to reduce number of moves necessary
2374 for two-address machines. */
2376 rest_of_handle_regmove (tree decl, rtx insns)
2378 timevar_push (TV_REGMOVE);
2379 open_dump_file (DFI_regmove, decl);
2381 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2383 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2384 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2385 timevar_pop (TV_REGMOVE);
2392 rest_of_handle_tracer (tree decl, rtx insns)
2394 timevar_push (TV_TRACER);
2395 open_dump_file (DFI_tracer, decl);
2397 dump_flow_info (rtl_dump_file);
2399 cleanup_cfg (CLEANUP_EXPENSIVE);
2400 reg_scan (insns, max_reg_num (), 0);
2401 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2402 timevar_pop (TV_TRACER);
2405 /* If-conversion and CFG cleanup. */
2407 rest_of_handle_if_conversion (tree decl, rtx insns)
2409 open_dump_file (DFI_ce1, decl);
2410 if (flag_if_conversion)
2412 timevar_push (TV_IFCVT);
2414 dump_flow_info (rtl_dump_file);
2415 cleanup_cfg (CLEANUP_EXPENSIVE);
2416 reg_scan (insns, max_reg_num (), 0);
2418 timevar_pop (TV_IFCVT);
2420 timevar_push (TV_JUMP);
2421 cleanup_cfg (CLEANUP_EXPENSIVE);
2422 reg_scan (insns, max_reg_num (), 0);
2423 timevar_pop (TV_JUMP);
2424 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2427 /* Rerun if-conversion, as combine may have simplified things enough
2428 to now meet sequence length restrictions. */
2430 rest_of_handle_if_after_combine (tree decl, rtx insns)
2432 timevar_push (TV_IFCVT);
2433 open_dump_file (DFI_ce2, decl);
2439 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2440 timevar_pop (TV_IFCVT);
2444 rest_of_handle_web (tree decl, rtx insns)
2446 open_dump_file (DFI_web, decl);
2447 timevar_push (TV_WEB);
2449 delete_trivially_dead_insns (insns, max_reg_num ());
2450 cleanup_cfg (CLEANUP_EXPENSIVE);
2452 timevar_pop (TV_WEB);
2453 close_dump_file (DFI_web, print_rtl_with_bb, insns);
2454 reg_scan (get_insns (), max_reg_num (), 0);
2457 /* Do branch profiling and static profile estimation passes. */
2459 rest_of_handle_branch_prob (tree decl, rtx insns)
2463 timevar_push (TV_BRANCH_PROB);
2464 open_dump_file (DFI_bp, decl);
2465 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2468 /* Discover and record the loop depth at the head of each basic
2469 block. The loop infrastructure does the real job for us. */
2470 flow_loops_find (&loops, LOOP_TREE);
2473 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2475 /* Estimate using heuristics if no profiling info is available. */
2476 if (flag_guess_branch_prob)
2477 estimate_probability (&loops);
2479 flow_loops_free (&loops);
2480 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2481 timevar_pop (TV_BRANCH_PROB);
2484 /* Do control and data flow analysis; write some of the results to the
2487 rest_of_handle_cfg (tree decl, rtx insns)
2489 open_dump_file (DFI_cfg, decl);
2491 dump_flow_info (rtl_dump_file);
2493 cleanup_cfg (CLEANUP_EXPENSIVE
2494 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2496 /* It may make more sense to mark constant functions after dead code is
2497 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2498 may insert code making function non-constant, but we still must consider
2499 it as constant, otherwise -fbranch-probabilities will not read data back.
2501 life_analysis rarely eliminates modification of external memory.
2504 mark_constant_function ();
2506 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2509 /* Purge addressofs. */
2511 rest_of_handle_addressof (tree decl, rtx insns)
2513 open_dump_file (DFI_addressof, decl);
2515 purge_addressof (insns);
2516 if (optimize && purge_all_dead_edges (0))
2517 delete_unreachable_blocks ();
2518 reg_scan (insns, max_reg_num (), 1);
2520 close_dump_file (DFI_addressof, print_rtl, insns);
2523 /* We may have potential sibling or tail recursion sites. Select one
2524 (of possibly multiple) methods of performing the call. */
2526 rest_of_handle_sibling_calls (rtx insns)
2529 optimize_sibling_and_tail_recursive_calls ();
2531 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2532 free_bb_for_insn ();
2533 find_exception_handler_labels ();
2534 rebuild_jump_labels (insns);
2535 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2537 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2538 notes before simplifying cfg and we must do lowering after sibcall
2539 that unhides parts of RTL chain and cleans up the CFG.
2541 Until sibcall is replaced by tree-level optimizer, lets just
2542 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2543 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2544 if (GET_CODE (insn) == NOTE
2545 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2548 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2551 /* Perform jump bypassing and control flow optimizations. */
2553 rest_of_handle_jump_bypass (tree decl, rtx insns)
2555 timevar_push (TV_BYPASS);
2556 open_dump_file (DFI_bypass, decl);
2558 cleanup_cfg (CLEANUP_EXPENSIVE);
2560 if (bypass_jumps (rtl_dump_file))
2562 rebuild_jump_labels (insns);
2563 cleanup_cfg (CLEANUP_EXPENSIVE);
2564 delete_trivially_dead_insns (insns, max_reg_num ());
2567 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2568 timevar_pop (TV_BYPASS);
2572 #ifdef ENABLE_CHECKING
2573 verify_flow_info ();
2577 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2578 if we must exit rest_of_compilation upon return. */
2580 rest_of_handle_inlining (tree decl)
2587 /* If we are reconsidering an inline function at the end of
2588 compilation, skip the stuff for making it inline. */
2589 if (cfun->rtl_inline_init)
2591 cfun->rtl_inline_init = 1;
2593 /* If this is nested inside an inlined external function, pretend
2594 it was only declared. Since we cannot inline such functions,
2595 generating code for this one is not only not necessary but will
2596 confuse some debugging output writers. */
2597 for (parent = DECL_CONTEXT (current_function_decl);
2598 parent != NULL_TREE;
2599 parent = get_containing_scope (parent))
2600 if (TREE_CODE (parent) == FUNCTION_DECL
2601 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2603 DECL_INITIAL (decl) = 0;
2606 else if (TYPE_P (parent))
2607 /* A function in a local class should be treated normally. */
2610 /* If requested, consider whether to make this function inline. */
2611 if ((DECL_INLINE (decl) && !flag_no_inline)
2612 || flag_inline_functions)
2614 timevar_push (TV_INTEGRATION);
2615 lose = function_cannot_inline_p (decl);
2616 timevar_pop (TV_INTEGRATION);
2617 if (lose || ! optimize)
2619 if (warn_inline && lose && DECL_INLINE (decl))
2621 char *msg = concat ("%J", lose, NULL);
2622 warning (msg, decl);
2625 DECL_ABSTRACT_ORIGIN (decl) = 0;
2626 /* Don't really compile an extern inline function.
2627 If we can't make it inline, pretend
2628 it was only declared. */
2629 if (DECL_EXTERNAL (decl))
2631 DECL_INITIAL (decl) = 0;
2636 inlinable = DECL_INLINE (decl) = 1;
2639 insns = get_insns ();
2641 /* Dump the rtl code if we are dumping rtl. */
2643 if (open_dump_file (DFI_rtl, decl))
2645 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2646 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2647 close_dump_file (DFI_rtl, print_rtl, insns);
2650 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2651 sorts of eh initialization. Delay this until after the
2652 initial rtl dump so that we can see the original nesting. */
2653 convert_from_eh_region_ranges ();
2655 /* If function is inline, and we don't yet know whether to
2656 compile it by itself, defer decision till end of compilation.
2657 wrapup_global_declarations will (indirectly) call
2658 rest_of_compilation again for those functions that need to
2659 be output. Also defer those functions that we are supposed
2663 || (DECL_INLINE (decl)
2664 && flag_inline_functions
2665 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2666 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2667 && ! flag_keep_inline_functions)
2668 || DECL_EXTERNAL (decl))))
2669 DECL_DEFER_OUTPUT (decl) = 1;
2671 if (DECL_INLINE (decl))
2672 /* DWARF wants separate debugging info for abstract and
2673 concrete instances of all inline functions, including those
2674 declared inline but not inlined, and those inlined even
2675 though they weren't declared inline. Conveniently, that's
2676 what DECL_INLINE means at this point. */
2677 (*debug_hooks->deferred_inline_function) (decl);
2679 if (DECL_DEFER_OUTPUT (decl))
2681 /* If -Wreturn-type, we have to do a bit of compilation. We just
2682 want to call cleanup the cfg to figure out whether or not we can
2683 fall off the end of the function; we do the minimum amount of
2684 work necessary to make that safe. */
2685 if (warn_return_type)
2687 int saved_optimize = optimize;
2690 rebuild_jump_labels (insns);
2691 find_exception_handler_labels ();
2692 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2693 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2694 optimize = saved_optimize;
2696 /* CFG is no longer maintained up-to-date. */
2697 free_bb_for_insn ();
2700 set_nothrow_function_flags ();
2701 if (current_function_nothrow)
2702 /* Now we know that this can't throw; set the flag for the benefit
2703 of other functions later in this translation unit. */
2704 TREE_NOTHROW (current_function_decl) = 1;
2706 timevar_push (TV_INTEGRATION);
2707 save_for_inline (decl);
2708 timevar_pop (TV_INTEGRATION);
2709 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2713 /* If specified extern inline but we aren't inlining it, we are
2714 done. This goes for anything that gets here with DECL_EXTERNAL
2715 set, not just things with DECL_INLINE. */
2716 return (bool) DECL_EXTERNAL (decl);
2719 /* Rest of compilation helper to convert the rtl to SSA form. */
2721 rest_of_handle_ssa (tree decl, rtx insns)
2723 timevar_push (TV_TO_SSA);
2724 open_dump_file (DFI_ssa, decl);
2726 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2729 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2730 timevar_pop (TV_TO_SSA);
2732 /* Perform sparse conditional constant propagation, if requested. */
2735 timevar_push (TV_SSA_CCP);
2736 open_dump_file (DFI_ssa_ccp, decl);
2740 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2741 timevar_pop (TV_SSA_CCP);
2744 /* It would be useful to cleanup the CFG at this point, but block
2745 merging and possibly other transformations might leave a PHI
2746 node in the middle of a basic block, which is a strict no-no. */
2748 /* The SSA implementation uses basic block numbers in its phi
2749 nodes. Thus, changing the control-flow graph or the basic
2750 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2751 may cause problems. */
2755 /* Remove dead code. */
2757 timevar_push (TV_SSA_DCE);
2758 open_dump_file (DFI_ssa_dce, decl);
2760 insns = get_insns ();
2761 ssa_eliminate_dead_code ();
2763 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2764 timevar_pop (TV_SSA_DCE);
2767 /* Convert from SSA form. */
2769 timevar_push (TV_FROM_SSA);
2770 open_dump_file (DFI_ussa, decl);
2772 convert_from_ssa ();
2773 /* New registers have been created. Rescan their usage. */
2774 reg_scan (insns, max_reg_num (), 1);
2776 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2777 timevar_pop (TV_FROM_SSA);
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
2841 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2842 timevar_pop (TV_FLOW);
2844 if (warn_uninitialized)
2846 uninitialized_vars_warning (DECL_INITIAL (decl));
2848 setjmp_args_warning ();
2853 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2855 /* Insns were inserted, and possibly pseudos created, so
2856 things might look a bit different. */
2857 insns = get_insns ();
2858 allocate_reg_life_data ();
2859 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2860 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2866 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2871 /* Perform common subexpression elimination. Nonzero value from
2872 `cse_main' means that jumps were simplified and some code may now
2873 be unreachable, so do jump optimization again. */
2875 rest_of_handle_cse (tree decl, rtx insns)
2879 open_dump_file (DFI_cse, decl);
2881 dump_flow_info (rtl_dump_file);
2882 timevar_push (TV_CSE);
2884 reg_scan (insns, max_reg_num (), 1);
2886 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2888 rebuild_jump_labels (insns);
2889 if (purge_all_dead_edges (0))
2890 delete_unreachable_blocks ();
2892 delete_trivially_dead_insns (insns, max_reg_num ());
2894 /* If we are not running more CSE passes, then we are no longer
2895 expecting CSE to be run. But always rerun it in a cheap mode. */
2896 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2898 if (tem || optimize > 1)
2899 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2900 /* Try to identify useless null pointer tests and delete them. */
2901 if (flag_delete_null_pointer_checks)
2903 timevar_push (TV_JUMP);
2905 if (delete_null_pointer_checks (insns))
2906 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2907 timevar_pop (TV_JUMP);
2910 /* The second pass of jump optimization is likely to have
2911 removed a bunch more instructions. */
2912 renumber_insns (rtl_dump_file);
2914 timevar_pop (TV_CSE);
2915 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2918 /* Run second CSE pass after loop optimizations. */
2920 rest_of_handle_cse2 (tree decl, rtx insns)
2924 timevar_push (TV_CSE2);
2925 open_dump_file (DFI_cse2, decl);
2927 dump_flow_info (rtl_dump_file);
2928 /* CFG is no longer maintained up-to-date. */
2929 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2930 purge_all_dead_edges (0);
2931 delete_trivially_dead_insns (insns, max_reg_num ());
2935 timevar_push (TV_JUMP);
2936 rebuild_jump_labels (insns);
2937 cleanup_cfg (CLEANUP_EXPENSIVE);
2938 timevar_pop (TV_JUMP);
2940 reg_scan (insns, max_reg_num (), 0);
2941 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2943 timevar_pop (TV_CSE2);
2946 /* Perform global cse. */
2948 rest_of_handle_gcse (tree decl, rtx insns)
2950 int save_csb, save_cfj;
2953 timevar_push (TV_GCSE);
2954 open_dump_file (DFI_gcse, decl);
2956 tem = gcse_main (insns, rtl_dump_file);
2957 rebuild_jump_labels (insns);
2958 delete_trivially_dead_insns (insns, max_reg_num ());
2960 save_csb = flag_cse_skip_blocks;
2961 save_cfj = flag_cse_follow_jumps;
2962 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2964 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2965 if (current_function_calls_constant_p)
2966 purge_builtin_constant_p ();
2968 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2970 if (flag_expensive_optimizations)
2972 timevar_push (TV_CSE);
2973 reg_scan (insns, max_reg_num (), 1);
2974 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2975 purge_all_dead_edges (0);
2976 delete_trivially_dead_insns (insns, max_reg_num ());
2977 timevar_pop (TV_CSE);
2978 cse_not_expected = !flag_rerun_cse_after_loop;
2981 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2982 things up. Then possibly re-run CSE again. */
2986 timevar_push (TV_JUMP);
2987 rebuild_jump_labels (insns);
2988 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2989 timevar_pop (TV_JUMP);
2991 if (flag_expensive_optimizations)
2993 timevar_push (TV_CSE);
2994 reg_scan (insns, max_reg_num (), 1);
2995 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2996 purge_all_dead_edges (0);
2997 delete_trivially_dead_insns (insns, max_reg_num ());
2998 timevar_pop (TV_CSE);
3002 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
3003 timevar_pop (TV_GCSE);
3006 flag_cse_skip_blocks = save_csb;
3007 flag_cse_follow_jumps = save_cfj;
3008 #ifdef ENABLE_CHECKING
3009 verify_flow_info ();
3013 /* Move constant computations out of loops. */
3015 rest_of_handle_loop_optimize (tree decl, rtx insns)
3017 int do_unroll, do_prefetch;
3019 timevar_push (TV_LOOP);
3020 delete_dead_jumptables ();
3021 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3022 open_dump_file (DFI_loop, decl);
3024 /* CFG is no longer maintained up-to-date. */
3025 free_bb_for_insn ();
3027 if (flag_unroll_loops)
3028 do_unroll = 0; /* Having two unrollers is useless. */
3030 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3031 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3033 if (flag_rerun_loop_opt)
3035 cleanup_barriers ();
3037 /* We only want to perform unrolling once. */
3038 loop_optimize (insns, rtl_dump_file, do_unroll);
3041 /* The first call to loop_optimize makes some instructions
3042 trivially dead. We delete those instructions now in the
3043 hope that doing so will make the heuristics in loop work
3044 better and possibly speed up compilation. */
3045 delete_trivially_dead_insns (insns, max_reg_num ());
3047 /* The regscan pass is currently necessary as the alias
3048 analysis code depends on this information. */
3049 reg_scan (insns, max_reg_num (), 1);
3051 cleanup_barriers ();
3052 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3054 /* Loop can create trivially dead instructions. */
3055 delete_trivially_dead_insns (insns, max_reg_num ());
3056 close_dump_file (DFI_loop, print_rtl, insns);
3057 timevar_pop (TV_LOOP);
3058 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3063 /* Perform loop optimizations. It might be better to do them a bit
3064 sooner, but we want the profile feedback to work more
3067 rest_of_handle_loop2 (tree decl, rtx insns)
3069 struct loops *loops;
3070 timevar_push (TV_LOOP);
3071 open_dump_file (DFI_loop2, decl);
3073 dump_flow_info (rtl_dump_file);
3075 loops = loop_optimizer_init (rtl_dump_file);
3079 /* The optimizations: */
3080 if (flag_unswitch_loops)
3081 unswitch_loops (loops);
3083 if (flag_peel_loops || flag_unroll_loops)
3084 unroll_and_peel_loops (loops,
3085 (flag_peel_loops ? UAP_PEEL : 0) |
3086 (flag_unroll_loops ? UAP_UNROLL : 0) |
3087 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3089 loop_optimizer_finalize (loops, rtl_dump_file);
3092 cleanup_cfg (CLEANUP_EXPENSIVE);
3093 delete_trivially_dead_insns (insns, max_reg_num ());
3094 reg_scan (insns, max_reg_num (), 0);
3096 dump_flow_info (rtl_dump_file);
3097 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3098 timevar_pop (TV_LOOP);
3102 /* This is called from finish_function (within langhooks.parse_file)
3103 after each top-level definition is parsed.
3104 It is supposed to compile that function or variable
3105 and output the assembler code for it.
3106 After we return, the tree storage is freed. */
3109 rest_of_compilation (tree decl)
3112 int rebuild_label_notes_after_reload;
3114 timevar_push (TV_REST_OF_COMPILATION);
3116 /* Register rtl specific functions for cfg. */
3117 rtl_register_cfg_hooks ();
3119 /* Now that we're out of the frontend, we shouldn't have any more
3120 CONCATs anywhere. */
3121 generating_concat_p = 0;
3123 /* When processing delayed functions, prepare_function_start() won't
3124 have been run to re-initialize it. */
3125 cse_not_expected = ! optimize;
3127 /* First, make sure that NOTE_BLOCK is set correctly for each
3128 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3129 if (!cfun->x_whole_function_mode_p)
3132 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3133 tree in sensible shape. So, we just recalculate it here. */
3134 if (cfun->x_whole_function_mode_p)
3139 if (rest_of_handle_inlining (decl))
3140 goto exit_rest_of_compilation;
3142 /* If we're emitting a nested function, make sure its parent gets
3143 emitted as well. Doing otherwise confuses debug info. */
3146 for (parent = DECL_CONTEXT (current_function_decl);
3147 parent != NULL_TREE;
3148 parent = get_containing_scope (parent))
3149 if (TREE_CODE (parent) == FUNCTION_DECL)
3150 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3153 /* We are now committed to emitting code for this function. Do any
3154 preparation, such as emitting abstract debug info for the inline
3155 before it gets mangled by optimization. */
3156 if (DECL_INLINE (decl))
3157 (*debug_hooks->outlining_inline_function) (decl);
3159 /* Remove any notes we don't need. That will make iterating
3160 over the instruction sequence faster, and allow the garbage
3161 collector to reclaim the memory used by the notes. */
3162 remove_unnecessary_notes ();
3167 /* Initialize some variables used by the optimizers. */
3168 init_function_for_compilation ();
3170 if (! DECL_DEFER_OUTPUT (decl))
3171 TREE_ASM_WRITTEN (decl) = 1;
3173 /* Now that integrate will no longer see our rtl, we need not
3174 distinguish between the return value of this function and the
3175 return value of called functions. Also, we can remove all SETs
3176 of subregs of hard registers; they are only here because of
3177 integrate. Also, we can now initialize pseudos intended to
3178 carry magic hard reg data throughout the function. */
3179 rtx_equal_function_value_matters = 0;
3180 purge_hard_subreg_sets (get_insns ());
3182 /* Early return if there were errors. We can run afoul of our
3183 consistency checks, and there's not really much point in fixing them.
3184 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3185 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3186 || errorcount || sorrycount)
3187 goto exit_rest_of_compilation;
3189 timevar_push (TV_JUMP);
3190 open_dump_file (DFI_sibling, decl);
3191 insns = get_insns ();
3192 rebuild_jump_labels (insns);
3193 find_exception_handler_labels ();
3194 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3196 delete_unreachable_blocks ();
3198 /* We have to issue these warnings now already, because CFG cleanups
3199 further down may destroy the required information. */
3200 check_function_return_warnings ();
3202 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3203 if (flag_guess_branch_prob)
3205 timevar_push (TV_BRANCH_PROB);
3206 note_prediction_to_br_prob ();
3207 timevar_pop (TV_BRANCH_PROB);
3210 if (flag_optimize_sibling_calls)
3211 rest_of_handle_sibling_calls (insns);
3213 timevar_pop (TV_JUMP);
3215 insn_locators_initialize ();
3216 /* Complete generation of exception handling code. */
3219 timevar_push (TV_JUMP);
3220 open_dump_file (DFI_eh, decl);
3222 finish_eh_generation ();
3224 close_dump_file (DFI_eh, print_rtl, get_insns ());
3225 timevar_pop (TV_JUMP);
3228 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3229 generation, which might create new sets. */
3230 emit_initial_value_sets ();
3233 /* If we are doing position-independent code generation, now
3234 is the time to output special prologues and epilogues.
3235 We do not want to do this earlier, because it just clutters
3236 up inline functions with meaningless insns. */
3241 insns = get_insns ();
3243 /* Copy any shared structure that should not be shared. */
3244 unshare_all_rtl (current_function_decl, insns);
3246 #ifdef SETJMP_VIA_SAVE_AREA
3247 /* This must be performed before virtual register instantiation.
3248 Please be aware the everything in the compiler that can look
3249 at the RTL up to this point must understand that REG_SAVE_AREA
3250 is just like a use of the REG contained inside. */
3251 if (current_function_calls_alloca)
3252 optimize_save_area_alloca (insns);
3255 /* Instantiate all virtual registers. */
3256 instantiate_virtual_regs (current_function_decl, insns);
3258 open_dump_file (DFI_jump, decl);
3260 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3261 are initialized and to compute whether control can drop off the end
3264 timevar_push (TV_JUMP);
3265 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3266 before jump optimization switches branch directions. */
3267 if (flag_guess_branch_prob)
3268 expected_value_to_br_prob ();
3270 reg_scan (insns, max_reg_num (), 0);
3271 rebuild_jump_labels (insns);
3272 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3273 delete_trivially_dead_insns (insns, max_reg_num ());
3275 dump_flow_info (rtl_dump_file);
3276 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3277 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3281 free_bb_for_insn ();
3282 copy_loop_headers (insns);
3283 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3285 purge_line_number_notes (insns);
3287 timevar_pop (TV_JUMP);
3288 close_dump_file (DFI_jump, print_rtl, insns);
3290 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3291 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3292 goto exit_rest_of_compilation;
3294 /* Long term, this should probably move before the jump optimizer too,
3295 but I didn't want to disturb the rtl_dump_and_exit and related
3296 stuff at this time. */
3297 if (optimize > 0 && flag_ssa)
3298 insns = rest_of_handle_ssa (decl, insns);
3300 timevar_push (TV_JUMP);
3303 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3305 if (flag_delete_null_pointer_checks)
3306 rest_of_handle_null_pointer (decl, insns);
3308 /* Jump optimization, and the removal of NULL pointer checks, may
3309 have reduced the number of instructions substantially. CSE, and
3310 future passes, allocate arrays whose dimensions involve the
3311 maximum instruction UID, so if we can reduce the maximum UID
3312 we'll save big on memory. */
3313 renumber_insns (rtl_dump_file);
3314 timevar_pop (TV_JUMP);
3316 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3321 rest_of_handle_cse (decl, insns);
3323 rest_of_handle_addressof (decl, insns);
3330 rest_of_handle_gcse (decl, insns);
3332 if (flag_loop_optimize)
3333 rest_of_handle_loop_optimize (decl, insns);
3336 rest_of_handle_jump_bypass (decl, insns);
3339 timevar_push (TV_FLOW);
3341 rest_of_handle_cfg (decl, insns);
3344 rest_of_handle_web (decl, insns);
3347 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3348 rest_of_handle_branch_prob (decl, insns);
3351 rest_of_handle_if_conversion (decl, insns);
3354 rest_of_handle_tracer (decl, insns);
3357 && (flag_unswitch_loops
3359 || flag_unroll_loops))
3360 rest_of_handle_loop2 (decl, insns);
3362 if (flag_rerun_cse_after_loop)
3363 rest_of_handle_cse2 (decl, insns);
3365 cse_not_expected = 1;
3367 rest_of_handle_life (decl, insns);
3370 rest_of_handle_combine (decl, insns);
3372 if (flag_if_conversion)
3373 rest_of_handle_if_after_combine (decl, insns);
3375 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3376 rest_of_handle_regmove (decl, insns);
3378 /* Do unconditional splitting before register allocation to allow machine
3379 description to add extra information not needed previously. */
3380 split_all_insns (1);
3382 #ifdef OPTIMIZE_MODE_SWITCHING
3383 timevar_push (TV_MODE_SWITCH);
3386 optimize_mode_switching (NULL);
3389 timevar_pop (TV_MODE_SWITCH);
3392 /* Any of the several passes since flow1 will have munged register
3393 lifetime data a bit. We need it to be up to date for scheduling
3394 (see handling of reg_known_equiv in init_alias_analysis). */
3395 recompute_reg_usage (insns, !optimize_size);
3397 #ifdef INSN_SCHEDULING
3398 rest_of_handle_sched (decl, insns);
3401 /* Determine if the current function is a leaf before running reload
3402 since this can impact optimizations done by the prologue and
3403 epilogue thus changing register elimination offsets. */
3404 current_function_is_leaf = leaf_function_p ();
3406 timevar_push (TV_LOCAL_ALLOC);
3407 open_dump_file (DFI_lreg, decl);
3409 if (flag_new_regalloc)
3411 if (rest_of_handle_new_regalloc (decl, insns,
3412 &rebuild_label_notes_after_reload))
3413 goto exit_rest_of_compilation;
3417 if (rest_of_handle_old_regalloc (decl, insns,
3418 &rebuild_label_notes_after_reload))
3419 goto exit_rest_of_compilation;
3424 open_dump_file (DFI_postreload, decl);
3426 /* Do a very simple CSE pass over just the hard registers. */
3429 timevar_push (TV_RELOAD_CSE_REGS);
3430 reload_cse_regs (insns);
3431 timevar_pop (TV_RELOAD_CSE_REGS);
3434 /* Register allocation and reloading may have turned an indirect jump into
3435 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3436 jumping instructions. */
3437 if (rebuild_label_notes_after_reload)
3439 timevar_push (TV_JUMP);
3441 rebuild_jump_labels (insns);
3442 purge_all_dead_edges (0);
3444 timevar_pop (TV_JUMP);
3447 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3449 /* Re-create the death notes which were deleted during reload. */
3450 timevar_push (TV_FLOW2);
3451 open_dump_file (DFI_flow2, decl);
3453 #ifdef ENABLE_CHECKING
3454 verify_flow_info ();
3457 /* If optimizing, then go ahead and split insns now. */
3461 split_all_insns (0);
3463 if (flag_branch_target_load_optimize)
3465 open_dump_file (DFI_branch_target_load, decl);
3467 branch_target_load_optimize (insns, false);
3469 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3475 cleanup_cfg (CLEANUP_EXPENSIVE);
3477 /* On some machines, the prologue and epilogue code, or parts thereof,
3478 can be represented as RTL. Doing so lets us schedule insns between
3479 it and the rest of the code and also allows delayed branch
3480 scheduling to operate in the epilogue. */
3481 thread_prologue_and_epilogue_insns (insns);
3482 epilogue_completed = 1;
3486 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3487 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3488 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3490 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3491 even for machines with possibly nonzero RETURN_POPS_ARGS
3492 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3493 push instructions will have popping returns. */
3494 #ifndef PUSH_ROUNDING
3495 if (!ACCUMULATE_OUTGOING_ARGS)
3497 combine_stack_adjustments ();
3502 flow2_completed = 1;
3504 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3505 timevar_pop (TV_FLOW2);
3507 #ifdef HAVE_peephole2
3508 if (optimize > 0 && flag_peephole2)
3510 timevar_push (TV_PEEPHOLE2);
3511 open_dump_file (DFI_peephole2, decl);
3513 peephole2_optimize (rtl_dump_file);
3515 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3516 timevar_pop (TV_PEEPHOLE2);
3522 if (flag_rename_registers || flag_cprop_registers)
3523 rest_of_handle_regrename (decl, insns);
3525 rest_of_handle_reorder_blocks (decl, insns);
3528 if (flag_if_conversion2)
3530 timevar_push (TV_IFCVT2);
3531 open_dump_file (DFI_ce3, decl);
3535 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3536 timevar_pop (TV_IFCVT2);
3539 if (flag_branch_target_load_optimize2)
3541 /* Leave this a warning for now so that it is possible to experiment
3542 with running this pass twice. In 3.6, we should either make this
3543 an error, or use separate dump files. */
3544 if (flag_branch_target_load_optimize)
3545 warning ("branch target register load optimization is not intended "
3548 open_dump_file (DFI_branch_target_load, decl);
3550 branch_target_load_optimize (insns, true);
3552 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3557 #ifdef INSN_SCHEDULING
3558 if (optimize > 0 && flag_schedule_insns_after_reload)
3559 rest_of_handle_sched2 (decl, insns);
3562 #ifdef LEAF_REGISTERS
3563 current_function_uses_only_leaf_regs
3564 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3568 rest_of_handle_stack_regs (decl, insns);
3571 compute_alignments ();
3573 /* CFG is no longer maintained up-to-date. */
3574 free_bb_for_insn ();
3576 if (targetm.machine_dependent_reorg != 0)
3577 rest_of_handle_machine_reorg (decl, insns);
3579 purge_line_number_notes (insns);
3580 cleanup_barriers ();
3583 if (optimize > 0 && flag_delayed_branch)
3584 rest_of_handle_delay_slots (decl, insns);
3587 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3588 timevar_push (TV_SHORTEN_BRANCH);
3589 split_all_insns_noflow ();
3590 timevar_pop (TV_SHORTEN_BRANCH);
3593 convert_to_eh_region_ranges ();
3595 /* Shorten branches. */
3596 timevar_push (TV_SHORTEN_BRANCH);
3597 shorten_branches (get_insns ());
3598 timevar_pop (TV_SHORTEN_BRANCH);
3600 set_nothrow_function_flags ();
3601 if (current_function_nothrow)
3602 /* Now we know that this can't throw; set the flag for the benefit
3603 of other functions later in this translation unit. */
3604 TREE_NOTHROW (current_function_decl) = 1;
3606 rest_of_handle_final (decl, insns);
3608 /* Write DBX symbols if requested. */
3610 /* Note that for those inline functions where we don't initially
3611 know for certain that we will be generating an out-of-line copy,
3612 the first invocation of this routine (rest_of_compilation) will
3613 skip over this code by doing a `goto exit_rest_of_compilation;'.
3614 Later on, wrapup_global_declarations will (indirectly) call
3615 rest_of_compilation again for those inline functions that need
3616 to have out-of-line copies generated. During that call, we
3617 *will* be routed past here. */
3619 timevar_push (TV_SYMOUT);
3620 (*debug_hooks->function_decl) (decl);
3621 timevar_pop (TV_SYMOUT);
3623 exit_rest_of_compilation:
3625 coverage_end_function ();
3627 /* In case the function was not output,
3628 don't leave any temporary anonymous types
3629 queued up for sdb output. */
3630 #ifdef SDB_DEBUGGING_INFO
3631 if (write_symbols == SDB_DEBUG)
3632 sdbout_types (NULL_TREE);
3635 reload_completed = 0;
3636 epilogue_completed = 0;
3637 flow2_completed = 0;
3640 timevar_push (TV_FINAL);
3642 /* Clear out the insn_length contents now that they are no
3644 init_insn_lengths ();
3646 /* Show no temporary slots allocated. */
3649 free_basic_block_vars (0);
3650 free_bb_for_insn ();
3652 timevar_pop (TV_FINAL);
3654 if ((*targetm.binds_local_p) (current_function_decl))
3656 int pref = cfun->preferred_stack_boundary;
3657 if (cfun->recursive_call_emit
3658 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3659 pref = cfun->stack_alignment_needed;
3660 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3664 /* Make sure volatile mem refs aren't considered valid operands for
3665 arithmetic insns. We must call this here if this is a nested inline
3666 function, since the above code leaves us in the init_recog state
3667 (from final.c), and the function context push/pop code does not
3668 save/restore volatile_ok.
3670 ??? Maybe it isn't necessary for expand_start_function to call this
3671 anymore if we do it here? */
3673 init_recog_no_volatile ();
3675 /* We're done with this function. Free up memory if we can. */
3676 free_after_parsing (cfun);
3677 if (! DECL_DEFER_OUTPUT (decl))
3679 free_after_compilation (cfun);
3680 DECL_SAVED_INSNS (decl) = 0;
3686 timevar_pop (TV_REST_OF_COMPILATION);
3689 /* Display help for target options. */
3691 display_target_options (void)
3694 static bool displayed = false;
3696 /* Avoid double printing for --help --target-help. */
3702 if (ARRAY_SIZE (target_switches) > 1
3703 #ifdef TARGET_OPTIONS
3704 || ARRAY_SIZE (target_options) > 1
3712 printf (_("\nTarget specific options:\n"));
3714 for (i = ARRAY_SIZE (target_switches); i--;)
3716 const char *option = target_switches[i].name;
3717 const char *description = target_switches[i].description;
3719 if (option == NULL || *option == 0)
3721 else if (description == NULL)
3726 printf (_(" -m%-23s [undocumented]\n"), option);
3728 else if (*description != 0)
3729 doc += printf (" -m%-23s %s\n", option, _(description));
3732 #ifdef TARGET_OPTIONS
3733 for (i = ARRAY_SIZE (target_options); i--;)
3735 const char *option = target_options[i].prefix;
3736 const char *description = target_options[i].description;
3738 if (option == NULL || *option == 0)
3740 else if (description == NULL)
3745 printf (_(" -m%-23s [undocumented]\n"), option);
3747 else if (*description != 0)
3748 doc += printf (" -m%-23s %s\n", option, _(description));
3754 printf (_("\nThere are undocumented target specific options as well.\n"));
3756 printf (_(" They exist, but they are not documented.\n"));
3761 /* Parse a -d... command line switch. */
3764 decode_d_option (const char *arg)
3772 for (i = 0; i < (int) DFI_MAX; ++i)
3773 dump_file[i].enabled = 1;
3779 flag_print_asm_name = 1;
3782 flag_dump_rtl_in_asm = 1;
3783 flag_print_asm_name = 1;
3786 graph_dump_format = vcg;
3789 rtl_dump_and_exit = 1;
3794 case 'D': /* These are handled by the preprocessor. */
3798 setup_core_dumping();
3803 for (i = 0; i < (int) DFI_MAX; ++i)
3804 if (c == dump_file[i].debug_switch)
3806 dump_file[i].enabled = 1;
3811 warning ("unrecognized gcc debugging option: %c", c);
3816 /* Indexed by enum debug_info_type. */
3817 const char *const debug_type_names[] =
3819 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3822 /* Decode -m switches. */
3823 /* Decode the switch -mNAME. */
3826 set_target_switch (const char *name)
3829 int valid_target_option = 0;
3831 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3832 if (!strcmp (target_switches[j].name, name))
3834 if (target_switches[j].value < 0)
3835 target_flags &= ~-target_switches[j].value;
3837 target_flags |= target_switches[j].value;
3840 if (target_switches[j].value < 0)
3841 target_flags_explicit |= -target_switches[j].value;
3843 target_flags_explicit |= target_switches[j].value;
3845 valid_target_option = 1;
3848 #ifdef TARGET_OPTIONS
3849 if (!valid_target_option)
3850 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3852 int len = strlen (target_options[j].prefix);
3853 if (target_options[j].value)
3855 if (!strcmp (target_options[j].prefix, name))
3857 *target_options[j].variable = target_options[j].value;
3858 valid_target_option = 1;
3863 if (!strncmp (target_options[j].prefix, name, len))
3865 *target_options[j].variable = name + len;
3866 valid_target_option = 1;
3872 if (!valid_target_option)
3873 error ("invalid option `%s'", name);
3876 /* Print version information to FILE.
3877 Each line begins with INDENT (for the case where FILE is the
3878 assembler output file). */
3881 print_version (FILE *file, const char *indent)
3884 #define __VERSION__ "[?]"
3888 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3890 "%s%s%s version %s (%s) compiled by CC.\n"
3892 , indent, *indent != 0 ? " " : "",
3893 lang_hooks.name, version_string, TARGET_NAME,
3894 indent, __VERSION__);
3895 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3896 indent, *indent != 0 ? " " : "",
3897 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3900 /* Print an option value and return the adjusted position in the line.
3901 ??? We don't handle error returns from fprintf (disk full); presumably
3902 other code will catch a disk full though. */
3905 print_single_switch (FILE *file, int pos, int max,
3906 const char *indent, const char *sep, const char *term,
3907 const char *type, const char *name)
3909 /* The ultrix fprintf returns 0 on success, so compute the result we want
3910 here since we need it for the following test. */
3911 int len = strlen (sep) + strlen (type) + strlen (name);
3916 fprintf (file, "%s", term);
3921 fprintf (file, "%s", indent);
3922 pos = strlen (indent);
3924 fprintf (file, "%s%s%s", sep, type, name);
3929 /* Print active target switches to FILE.
3930 POS is the current cursor position and MAX is the size of a "line".
3931 Each line begins with INDENT and ends with TERM.
3932 Each switch is separated from the next by SEP. */
3935 print_switch_values (FILE *file, int pos, int max,
3936 const char *indent, const char *sep, const char *term)
3941 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3942 that it can be printed below. This helps reproducibility. */
3945 /* Print the options as passed. */
3946 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3947 _("options passed: "), "");
3949 for (p = &save_argv[1]; *p != NULL; p++)
3953 if (strcmp (*p, "-o") == 0)
3959 if (strcmp (*p, "-quiet") == 0)
3961 if (strcmp (*p, "-version") == 0)
3966 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3969 fprintf (file, "%s", term);
3971 /* Print the -f and -m options that have been enabled.
3972 We don't handle language specific options but printing argv
3975 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3976 _("options enabled: "), "");
3978 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3979 if (*f_options[j].variable == f_options[j].on_value)
3980 pos = print_single_switch (file, pos, max, indent, sep, term,
3981 "-f", f_options[j].string);
3983 /* Print target specific options. */
3985 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3986 if (target_switches[j].name[0] != '\0'
3987 && target_switches[j].value > 0
3988 && ((target_switches[j].value & target_flags)
3989 == target_switches[j].value))
3991 pos = print_single_switch (file, pos, max, indent, sep, term,
3992 "-m", target_switches[j].name);
3995 #ifdef TARGET_OPTIONS
3996 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3997 if (*target_options[j].variable != NULL)
4000 sprintf (prefix, "-m%s", target_options[j].prefix);
4001 pos = print_single_switch (file, pos, max, indent, sep, term,
4002 prefix, *target_options[j].variable);
4006 fprintf (file, "%s", term);
4009 /* Open assembly code output file. Do this even if -fsyntax-only is
4010 on, because then the driver will have provided the name of a
4011 temporary file or bit bucket for us. NAME is the file specified on
4012 the command line, possibly NULL. */
4014 init_asm_output (const char *name)
4016 if (name == NULL && asm_file_name == 0)
4017 asm_out_file = stdout;
4020 if (asm_file_name == 0)
4022 int len = strlen (dump_base_name);
4023 char *dumpname = xmalloc (len + 6);
4024 memcpy (dumpname, dump_base_name, len + 1);
4025 strip_off_ending (dumpname, len);
4026 strcat (dumpname, ".s");
4027 asm_file_name = dumpname;
4029 if (!strcmp (asm_file_name, "-"))
4030 asm_out_file = stdout;
4032 asm_out_file = fopen (asm_file_name, "w+");
4033 if (asm_out_file == 0)
4034 fatal_error ("can't open %s for writing: %m", asm_file_name);
4037 #ifdef IO_BUFFER_SIZE
4038 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
4039 _IOFBF, IO_BUFFER_SIZE);
4042 if (!flag_syntax_only)
4044 targetm.asm_out.file_start ();
4046 #ifdef ASM_COMMENT_START
4047 if (flag_verbose_asm)
4049 /* Print the list of options in effect. */
4050 print_version (asm_out_file, ASM_COMMENT_START);
4051 print_switch_values (asm_out_file, 0, MAX_LINE,
4052 ASM_COMMENT_START, " ", "\n");
4053 /* Add a blank line here so it appears in assembler output but not
4055 fprintf (asm_out_file, "\n");
4061 /* Default tree printer. Handles declarations only. */
4063 default_tree_printer (pretty_printer * pp, text_info *text)
4065 switch (*text->format_spec)
4071 tree t = va_arg (*text->args_ptr, tree);
4072 const char *n = DECL_NAME (t)
4073 ? (*lang_hooks.decl_printable_name) (t, 2)
4084 /* Initialization of the front end environment, before command line
4085 options are parsed. Signal handlers, internationalization etc.
4086 ARGV0 is main's argv[0]. */
4088 general_init (const char *argv0)
4092 p = argv0 + strlen (argv0);
4093 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4097 xmalloc_set_program_name (progname);
4101 gcc_init_libintl ();
4103 /* Initialize the diagnostics reporting machinery, so option parsing
4104 can give warnings and errors. */
4105 diagnostic_initialize (global_dc);
4106 /* Set a default printer. Language specific initializations will
4107 override it later. */
4108 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4110 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4112 signal (SIGSEGV, crash_signal);
4115 signal (SIGILL, crash_signal);
4118 signal (SIGBUS, crash_signal);
4121 signal (SIGABRT, crash_signal);
4123 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4124 signal (SIGIOT, crash_signal);
4127 signal (SIGFPE, crash_signal);
4130 /* Other host-specific signal setup. */
4131 (*host_hooks.extra_signals)();
4133 /* Initialize the garbage-collector, string pools and tree type hash
4139 /* Initialize register usage now so switches may override. */
4142 /* Register the language-independent parameters. */
4143 add_params (lang_independent_params, LAST_PARAM);
4145 /* This must be done after add_params but before argument processing. */
4146 init_ggc_heuristics();
4149 /* Process the options that have been parsed. */
4151 process_options (void)
4153 /* Allow the front end to perform consistency checks and do further
4154 initialization based on the command line options. This hook also
4155 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4156 so we can correctly initialize debug output. */
4157 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4158 input_filename = main_input_filename;
4160 #ifdef OVERRIDE_OPTIONS
4161 /* Some machines may reject certain combinations of options. */
4165 /* Set aux_base_name if not already set. */
4168 else if (main_input_filename)
4170 char *name = xstrdup (lbasename (main_input_filename));
4172 strip_off_ending (name, strlen (name));
4173 aux_base_name = name;
4176 aux_base_name = "gccaux";
4178 /* Set up the align_*_log variables, defaulting them to 1 if they
4179 were still unset. */
4180 if (align_loops <= 0) align_loops = 1;
4181 if (align_loops_max_skip > align_loops || !align_loops)
4182 align_loops_max_skip = align_loops - 1;
4183 align_loops_log = floor_log2 (align_loops * 2 - 1);
4184 if (align_jumps <= 0) align_jumps = 1;
4185 if (align_jumps_max_skip > align_jumps || !align_jumps)
4186 align_jumps_max_skip = align_jumps - 1;
4187 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4188 if (align_labels <= 0) align_labels = 1;
4189 align_labels_log = floor_log2 (align_labels * 2 - 1);
4190 if (align_labels_max_skip > align_labels || !align_labels)
4191 align_labels_max_skip = align_labels - 1;
4192 if (align_functions <= 0) align_functions = 1;
4193 align_functions_log = floor_log2 (align_functions * 2 - 1);
4195 /* Unrolling all loops implies that standard loop unrolling must also
4197 if (flag_unroll_all_loops)
4198 flag_unroll_loops = 1;
4200 if (flag_unroll_loops)
4202 flag_old_unroll_loops = 0;
4203 flag_old_unroll_all_loops = 0;
4206 if (flag_old_unroll_all_loops)
4207 flag_old_unroll_loops = 1;
4209 /* Old loop unrolling requires that strength_reduction be on also. Silently
4210 turn on strength reduction here if it isn't already on. Also, the loop
4211 unrolling code assumes that cse will be run after loop, so that must
4212 be turned on also. */
4213 if (flag_old_unroll_loops)
4215 flag_strength_reduce = 1;
4216 flag_rerun_cse_after_loop = 1;
4218 if (flag_unroll_loops || flag_peel_loops)
4219 flag_rerun_cse_after_loop = 1;
4221 if (flag_non_call_exceptions)
4222 flag_asynchronous_unwind_tables = 1;
4223 if (flag_asynchronous_unwind_tables)
4224 flag_unwind_tables = 1;
4226 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4228 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4229 flag_unit_at_a_time = 0;
4231 /* Warn about options that are not supported on this machine. */
4232 #ifndef INSN_SCHEDULING
4233 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4234 warning ("instruction scheduling not supported on this target machine");
4237 if (flag_delayed_branch)
4238 warning ("this target machine does not have delayed branches");
4241 user_label_prefix = USER_LABEL_PREFIX;
4242 if (flag_leading_underscore != -1)
4244 /* If the default prefix is more complicated than "" or "_",
4245 issue a warning and ignore this option. */
4246 if (user_label_prefix[0] == 0 ||
4247 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4249 user_label_prefix = flag_leading_underscore ? "_" : "";
4252 warning ("-f%sleading-underscore not supported on this target machine",
4253 flag_leading_underscore ? "" : "no-");
4256 /* If we are in verbose mode, write out the version and maybe all the
4257 option flags in use. */
4260 print_version (stderr, "");
4262 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4265 if (flag_syntax_only)
4267 write_symbols = NO_DEBUG;
4271 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4273 if (debug_info_level == DINFO_LEVEL_NONE)
4274 write_symbols = NO_DEBUG;
4276 /* Now we know write_symbols, set up the debug hooks based on it.
4277 By default we do nothing for debug output. */
4278 if (write_symbols == NO_DEBUG)
4279 debug_hooks = &do_nothing_debug_hooks;
4280 #if defined(DBX_DEBUGGING_INFO)
4281 else if (write_symbols == DBX_DEBUG)
4282 debug_hooks = &dbx_debug_hooks;
4284 #if defined(XCOFF_DEBUGGING_INFO)
4285 else if (write_symbols == XCOFF_DEBUG)
4286 debug_hooks = &xcoff_debug_hooks;
4288 #ifdef SDB_DEBUGGING_INFO
4289 else if (write_symbols == SDB_DEBUG)
4290 debug_hooks = &sdb_debug_hooks;
4292 #ifdef DWARF_DEBUGGING_INFO
4293 else if (write_symbols == DWARF_DEBUG)
4294 debug_hooks = &dwarf_debug_hooks;
4296 #ifdef DWARF2_DEBUGGING_INFO
4297 else if (write_symbols == DWARF2_DEBUG)
4298 debug_hooks = &dwarf2_debug_hooks;
4300 #ifdef VMS_DEBUGGING_INFO
4301 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4302 debug_hooks = &vmsdbg_debug_hooks;
4305 error ("target system does not support the \"%s\" debug format",
4306 debug_type_names[write_symbols]);
4308 /* If auxiliary info generation is desired, open the output file.
4309 This goes in the same directory as the source file--unlike
4310 all the other output files. */
4311 if (flag_gen_aux_info)
4313 aux_info_file = fopen (aux_info_file_name, "w");
4314 if (aux_info_file == 0)
4315 fatal_error ("can't open %s: %m", aux_info_file_name);
4318 if (! targetm.have_named_sections)
4320 if (flag_function_sections)
4322 warning ("-ffunction-sections not supported for this target");
4323 flag_function_sections = 0;
4325 if (flag_data_sections)
4327 warning ("-fdata-sections not supported for this target");
4328 flag_data_sections = 0;
4332 if (flag_function_sections && profile_flag)
4334 warning ("-ffunction-sections disabled; it makes profiling impossible");
4335 flag_function_sections = 0;
4338 #ifndef HAVE_prefetch
4339 if (flag_prefetch_loop_arrays)
4341 warning ("-fprefetch-loop-arrays not supported for this target");
4342 flag_prefetch_loop_arrays = 0;
4345 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4347 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4348 flag_prefetch_loop_arrays = 0;
4352 /* This combination of options isn't handled for i386 targets and doesn't
4353 make much sense anyway, so don't allow it. */
4354 if (flag_prefetch_loop_arrays && optimize_size)
4356 warning ("-fprefetch-loop-arrays is not supported with -Os");
4357 flag_prefetch_loop_arrays = 0;
4360 #ifndef OBJECT_FORMAT_ELF
4361 if (flag_function_sections && write_symbols != NO_DEBUG)
4362 warning ("-ffunction-sections may affect debugging on some targets");
4365 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4366 if (flag_signaling_nans)
4367 flag_trapping_math = 1;
4370 /* Initialize the compiler back end. */
4374 init_adjust_machine_modes ();
4376 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4377 || debug_info_level == DINFO_LEVEL_VERBOSE
4378 #ifdef VMS_DEBUGGING_INFO
4379 /* Enable line number info for traceback. */
4380 || debug_info_level > DINFO_LEVEL_NONE
4382 || flag_test_coverage
4383 || warn_notreached);
4386 init_fake_stack_mems ();
4390 init_function_once ();
4391 init_varasm_once ();
4393 /* The following initialization functions need to generate rtl, so
4394 provide a dummy function context for them. */
4395 init_dummy_function_start ();
4397 if (flag_caller_saves)
4398 init_caller_save ();
4399 expand_dummy_function_end ();
4402 /* Language-dependent initialization. Returns nonzero on success. */
4404 lang_dependent_init (const char *name)
4406 if (dump_base_name == 0)
4407 dump_base_name = name ? name : "gccdump";
4409 /* Other front-end initialization. */
4410 if ((*lang_hooks.init) () == 0)
4413 init_asm_output (name);
4415 /* These create various _DECL nodes, so need to be called after the
4416 front end is initialized. */
4420 /* The following initialization functions need to generate rtl, so
4421 provide a dummy function context for them. */
4422 init_dummy_function_start ();
4424 expand_dummy_function_end ();
4426 /* If dbx symbol table desired, initialize writing it and output the
4427 predefined types. */
4428 timevar_push (TV_SYMOUT);
4430 #ifdef DWARF2_UNWIND_INFO
4431 if (dwarf2out_do_frame ())
4432 dwarf2out_frame_init ();
4435 /* Now we have the correct original filename, we can initialize
4437 (*debug_hooks->init) (name);
4439 timevar_pop (TV_SYMOUT);
4444 /* Clean up: close opened files, etc. */
4449 /* Close the dump files. */
4450 if (flag_gen_aux_info)
4452 fclose (aux_info_file);
4454 unlink (aux_info_file_name);
4457 /* Close non-debugging input and output files. Take special care to note
4458 whether fclose returns an error, since the pages might still be on the
4459 buffer chain while the file is open. */
4463 if (ferror (asm_out_file) != 0)
4464 fatal_error ("error writing to %s: %m", asm_file_name);
4465 if (fclose (asm_out_file) != 0)
4466 fatal_error ("error closing %s: %m", asm_file_name);
4469 /* Do whatever is necessary to finish printing the graphs. */
4470 if (graph_dump_format != no_graph)
4474 for (i = 0; i < (int) DFI_MAX; ++i)
4475 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4480 sprintf (seq, DUMPFILE_FORMAT, i);
4481 suffix = concat (seq, dump_file[i].extension, NULL);
4482 finish_graph_dump_file (dump_base_name, suffix);
4489 ggc_print_statistics ();
4490 stringpool_statistics ();
4491 dump_tree_statistics ();
4494 /* Free up memory for the benefit of leak detectors. */
4497 /* Language-specific end of compilation actions. */
4498 (*lang_hooks.finish) ();
4501 /* Initialize the compiler, and compile the input file. */
4505 /* Initialize timing first. The C front ends read the main file in
4506 the post_options hook, and C++ does file timings. */
4507 if (time_report || !quiet_flag || flag_detailed_statistics)
4509 timevar_start (TV_TOTAL);
4513 /* Don't do any more if an error has already occurred. */
4516 /* Set up the back-end if requested. */
4520 /* Language-dependent initialization. Returns true on success. */
4521 if (lang_dependent_init (main_input_filename))
4523 if (flag_unit_at_a_time)
4525 open_dump_file (DFI_cgraph, NULL);
4526 cgraph_dump_file = rtl_dump_file;
4527 rtl_dump_file = NULL;
4532 if (flag_unit_at_a_time)
4534 rtl_dump_file = cgraph_dump_file;
4535 cgraph_dump_file = NULL;
4536 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4543 /* Stop timing and print the times. */
4544 timevar_stop (TV_TOTAL);
4545 timevar_print (stderr);
4548 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4549 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4550 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4552 It is not safe to call this function more than once. */
4555 toplev_main (unsigned int argc, const char **argv)
4559 /* Initialization of GCC's environment, and diagnostics. */
4560 general_init (argv[0]);
4562 /* Parse the options and do minimal processing; basically just
4563 enough to default flags appropriately. */
4564 decode_options (argc, argv);
4568 /* Exit early if we can (e.g. -help). */
4569 if (!exit_after_options)
4572 if (errorcount || sorrycount)
4573 return (FATAL_EXIT_CODE);
4575 return (SUCCESS_EXIT_CODE);