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. */
284 DFI_branch_target_load,
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 static struct dump_file_info dump_file[DFI_MAX] =
303 { "cgraph", 'U', 0, 0, 0 },
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "null", 'u', 0, 0, 0 },
313 { "cse", 's', 0, 0, 0 },
314 { "addressof", 'F', 0, 0, 0 },
315 { "gcse", 'G', 1, 0, 0 },
316 { "loop", 'L', 1, 0, 0 },
317 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "cfg", 'f', 1, 0, 0 },
319 { "bp", 'b', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "cse2", 't', 1, 0, 0 },
324 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
325 { "combine", 'c', 1, 0, 0 },
326 { "ce2", 'C', 1, 0, 0 },
327 { "regmove", 'N', 1, 0, 0 },
328 { "sched", 'S', 1, 0, 0 },
329 { "lreg", 'l', 1, 0, 0 },
330 { "greg", 'g', 1, 0, 0 },
331 { "postreload", 'o', 1, 0, 0 },
332 { "flow2", 'w', 1, 0, 0 },
333 { "peephole2", 'z', 1, 0, 0 },
334 { "rnreg", 'n', 1, 0, 0 },
335 { "bbro", 'B', 1, 0, 0 },
336 { "ce3", 'E', 1, 0, 0 },
337 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
338 { "sched2", 'R', 1, 0, 0 },
339 { "stack", 'k', 1, 0, 0 },
340 { "mach", 'M', 1, 0, 0 },
341 { "dbr", 'd', 0, 0, 0 },
344 static int open_dump_file (enum dump_file_index, tree);
345 static void close_dump_file (enum dump_file_index,
346 void (*) (FILE *, rtx), rtx);
348 /* Other flags saying which kinds of debugging dump have been requested. */
350 int rtl_dump_and_exit;
351 int flag_print_asm_name;
352 enum graph_dump_types graph_dump_format;
354 /* Name for output file of assembly code, specified with -o. */
356 const char *asm_file_name;
358 /* Nonzero means do optimizations. -O.
359 Particular numeric values stand for particular amounts of optimization;
360 thus, -O2 stores 2 here. However, the optimizations beyond the basic
361 ones are not controlled directly by this variable. Instead, they are
362 controlled by individual `flag_...' variables that are defaulted
363 based on this variable. */
367 /* Nonzero means optimize for size. -Os.
368 The only valid values are zero and nonzero. When optimize_size is
369 nonzero, optimize defaults to 2, but certain individual code
370 bloating optimizations are disabled. */
372 int optimize_size = 0;
374 /* The FUNCTION_DECL for the function currently being compiled,
375 or 0 if between functions. */
376 tree current_function_decl;
378 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
380 tree current_function_func_begin_label;
382 /* Nonzero if doing dwarf2 duplicate elimination. */
384 int flag_eliminate_dwarf2_dups = 0;
386 /* Nonzero if doing unused type elimination. */
388 int flag_eliminate_unused_debug_types = 1;
390 /* Nonzero means emit debugging information only for symbols which are used. */
391 int flag_debug_only_used_symbols = 0;
393 /* Nonzero if generating code to do profiling. */
395 int profile_flag = 0;
397 /* Nonzero if generating code to profile program flow graph arcs. */
399 int profile_arc_flag = 0;
401 /* Nonzero if value histograms should be measured. */
403 int flag_profile_values = 0;
405 /* Nonzero if generating info for gcov to calculate line test coverage. */
407 int flag_test_coverage = 0;
409 /* Nonzero indicates that branch taken probabilities should be calculated. */
411 int flag_branch_probabilities = 0;
413 /* Nonzero if basic blocks should be reordered. */
415 int flag_reorder_blocks = 0;
417 /* Nonzero if functions should be reordered. */
419 int flag_reorder_functions = 0;
421 /* Nonzero if registers should be renamed. */
423 int flag_rename_registers = 0;
424 int flag_cprop_registers = 0;
426 /* Nonzero for -pedantic switch: warn about anything
427 that standard spec forbids. */
431 /* Temporarily suppress certain warnings.
432 This is set while reading code from a system header file. */
434 int in_system_header = 0;
436 /* Don't print functions as they are compiled. -quiet. */
440 /* Print times taken by the various passes. -ftime-report. */
444 /* Print memory still in use at end of compilation (which may have little
445 to do with peak memory consumption). -fmem-report. */
449 /* Nonzero means to collect statistics which might be expensive
450 and to print them when we are done. */
451 int flag_detailed_statistics = 0;
453 /* A random sequence of characters, unless overridden by user. */
454 const char *flag_random_seed;
456 /* A local time stamp derived from the time of compilation. It will be
457 zero if the system cannot provide a time. It will be -1u, if the
458 user has specified a particular random seed. */
463 /* Nonzero means `char' should be signed. */
465 int flag_signed_char;
467 /* Nonzero means give an enum type only as many bytes as it needs. */
469 int flag_short_enums;
471 /* Nonzero for -fcaller-saves: allocate values in regs that need to
472 be saved across function calls, if that produces overall better code.
473 Optional now, so people can test it. */
475 #ifdef DEFAULT_CALLER_SAVES
476 int flag_caller_saves = 1;
478 int flag_caller_saves = 0;
481 /* Nonzero if structures and unions should be returned in memory.
483 This should only be defined if compatibility with another compiler or
484 with an ABI is needed, because it results in slower code. */
486 #ifndef DEFAULT_PCC_STRUCT_RETURN
487 #define DEFAULT_PCC_STRUCT_RETURN 1
490 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
492 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
494 /* Nonzero for -fforce-mem: load memory value into a register
495 before arithmetic on it. This makes better cse but slower compilation. */
497 int flag_force_mem = 0;
499 /* Nonzero for -fforce-addr: load memory address into a register before
500 reference to memory. This makes better cse but slower compilation. */
502 int flag_force_addr = 0;
504 /* Nonzero for -fdefer-pop: don't pop args after each function call;
505 instead save them up to pop many calls' args with one insns. */
507 int flag_defer_pop = 0;
509 /* Nonzero for -ffloat-store: don't allocate floats and doubles
510 in extended-precision registers. */
512 int flag_float_store = 0;
514 /* Nonzero for -fcse-follow-jumps:
515 have cse follow jumps to do a more extensive job. */
517 int flag_cse_follow_jumps;
519 /* Nonzero for -fcse-skip-blocks:
520 have cse follow a branch around a block. */
521 int flag_cse_skip_blocks;
523 /* Nonzero for -fexpensive-optimizations:
524 perform miscellaneous relatively-expensive optimizations. */
525 int flag_expensive_optimizations;
527 /* Nonzero for -fthread-jumps:
528 have jump optimize output of loop. */
530 int flag_thread_jumps;
532 /* Nonzero enables strength-reduction in loop.c. */
534 int flag_strength_reduce = 0;
536 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
537 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
538 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
541 int flag_old_unroll_loops;
543 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
544 This is generally not a win. */
546 int flag_old_unroll_all_loops;
548 /* Enables unrolling of simple loops in loop-unroll.c. */
549 int flag_unroll_loops;
551 /* Enables unrolling of all loops in loop-unroll.c. */
552 int flag_unroll_all_loops;
554 /* Nonzero enables loop peeling. */
557 /* Nonzero enables loop unswitching. */
558 int flag_unswitch_loops;
560 /* Nonzero enables prefetch optimizations for arrays in loops. */
562 int flag_prefetch_loop_arrays;
564 /* Nonzero forces all invariant computations in loops to be moved
567 int flag_move_all_movables = 0;
569 /* Nonzero forces all general induction variables in loops to be
572 int flag_reduce_all_givs = 0;
574 /* Nonzero to perform full register move optimization passes. This is the
577 int flag_regmove = 0;
579 /* Nonzero for -fwritable-strings:
580 store string constants in data segment and don't uniquize them. */
582 int flag_writable_strings = 0;
584 /* Nonzero means don't put addresses of constant functions in registers.
585 Used for compiling the Unix kernel, where strange substitutions are
586 done on the assembly output. */
588 int flag_no_function_cse = 0;
590 /* Nonzero for -fomit-frame-pointer:
591 don't make a frame pointer in simple functions that don't require one. */
593 int flag_omit_frame_pointer = 0;
595 /* Nonzero means place each function into its own section on those platforms
596 which support arbitrary section names and unlimited numbers of sections. */
598 int flag_function_sections = 0;
600 /* ... and similar for data. */
602 int flag_data_sections = 0;
604 /* Nonzero to inhibit use of define_optimization peephole opts. */
606 int flag_no_peephole = 0;
608 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
610 int flag_optimize_sibling_calls = 0;
612 /* Nonzero means the front end generally wants `errno' maintained by math
613 operations, like built-in SQRT. */
615 int flag_errno_math = 1;
617 /* Nonzero means that unsafe floating-point math optimizations are allowed
618 for the sake of speed. IEEE compliance is not guaranteed, and operations
619 are allowed to assume that their arguments and results are "normal"
620 (e.g., nonnegative for SQRT). */
622 int flag_unsafe_math_optimizations = 0;
624 /* Nonzero means that no NaNs or +-Infs are expected. */
626 int flag_finite_math_only = 0;
628 /* Zero means that floating-point math operations cannot generate a
629 (user-visible) trap. This is the case, for example, in nonstop
630 IEEE 754 arithmetic. Trapping conditions include division by zero,
631 overflow, underflow, invalid and inexact, but does not include
632 operations on signaling NaNs (see below). */
634 int flag_trapping_math = 1;
636 /* Nonzero means disable transformations that assume default floating
637 point rounding behavior. */
639 int flag_rounding_math = 0;
641 /* Nonzero means disable transformations observable by signaling NaNs.
642 This option implies that any operation on an IEEE signaling NaN can
643 generate a (user-visible) trap. */
645 int flag_signaling_nans = 0;
647 /* 0 means straightforward implementation of complex divide acceptable.
648 1 means wide ranges of inputs must work for complex divide.
649 2 means C99-like requirements for complex divide (not yet implemented). */
651 int flag_complex_divide_method = 0;
653 /* Nonzero means just do syntax checking; don't output anything. */
655 int flag_syntax_only = 0;
657 /* Nonzero means perform loop optimizer. */
659 int flag_loop_optimize;
661 /* Nonzero means perform crossjumping. */
663 int flag_crossjumping;
665 /* Nonzero means perform if conversion. */
667 int flag_if_conversion;
669 /* Nonzero means perform if conversion after reload. */
671 int flag_if_conversion2;
673 /* Nonzero means to use global dataflow analysis to eliminate
674 useless null pointer tests. */
676 int flag_delete_null_pointer_checks;
678 /* Nonzero means perform global CSE. */
682 /* Nonzero means to do the enhanced load motion during gcse, which trys
683 to hoist loads by not killing them when a store to the same location
686 int flag_gcse_lm = 1;
688 /* Nonzero means to perform store motion after gcse, which will try to
689 move stores closer to the exit block. Its not very effective without
692 int flag_gcse_sm = 1;
694 /* Perform target register optimization before prologue / epilogue
697 int flag_branch_target_load_optimize = 0;
699 /* Perform target register optimization after prologue / epilogue
700 threading and jump2. */
702 int flag_branch_target_load_optimize2 = 0;
704 /* Nonzero means to rerun cse after loop optimization. This increases
705 compilation time about 20% and picks up a few more common expressions. */
707 int flag_rerun_cse_after_loop;
709 /* Nonzero means to run loop optimizations twice. */
711 int flag_rerun_loop_opt;
713 /* Nonzero for -finline-functions: ok to inline functions that look like
714 good inline candidates. */
716 int flag_inline_functions;
718 /* Nonzero for -fkeep-inline-functions: even if we make a function
719 go inline everywhere, keep its definition around for debugging
722 int flag_keep_inline_functions;
724 /* Nonzero means that functions will not be inlined. */
726 int flag_no_inline = 2;
728 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
729 not just because the tree inliner turned us off. */
731 int flag_really_no_inline = 2;
733 /* Nonzero means that we should emit static const variables
734 regardless of whether or not optimization is turned on. */
736 int flag_keep_static_consts = 1;
738 /* Nonzero means we should be saving declaration info into a .X file. */
740 int flag_gen_aux_info = 0;
742 /* Specified name of aux-info file. */
744 const char *aux_info_file_name;
746 /* Nonzero means make the text shared if supported. */
748 int flag_shared_data;
750 /* Nonzero means schedule into delayed branch slots if supported. */
752 int flag_delayed_branch;
754 /* Nonzero if we are compiling pure (sharable) code.
755 Value is 1 if we are doing "small" pic; value is 2 if we're doing
760 /* Nonzero if we are compiling position independent code for executable.
761 The value is 1 if we are doing "small" pic; value is 2 if we're doing
766 /* Nonzero if we are compiling code for a shared library, zero for
771 /* Set to the default thread-local storage (tls) model to use. */
773 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
775 /* Nonzero means generate extra code for exception handling and enable
776 exception handling. */
780 /* Nonzero means generate frame unwind info table when supported. */
782 int flag_unwind_tables = 0;
784 /* Nonzero means generate frame unwind info table exact at each insn
787 int flag_asynchronous_unwind_tables = 0;
789 /* Nonzero means don't place uninitialized global data in common storage
794 /* Nonzero means change certain warnings into errors.
795 Usually these are warnings about failure to conform to some standard. */
797 int flag_pedantic_errors = 0;
799 /* flag_schedule_insns means schedule insns within basic blocks (before
801 flag_schedule_insns_after_reload means schedule insns after
804 int flag_schedule_insns = 0;
805 int flag_schedule_insns_after_reload = 0;
807 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
808 int flag_sched2_use_superblocks = 0;
810 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
812 int flag_sched2_use_traces = 0;
814 /* The following flags have effect only for scheduling before register
817 flag_schedule_interblock means schedule insns across basic blocks.
818 flag_schedule_speculative means allow speculative motion of non-load insns.
819 flag_schedule_speculative_load means allow speculative motion of some
821 flag_schedule_speculative_load_dangerous allows speculative motion of more
824 int flag_schedule_interblock = 1;
825 int flag_schedule_speculative = 1;
826 int flag_schedule_speculative_load = 0;
827 int flag_schedule_speculative_load_dangerous = 0;
829 /* The following flags have an effect during scheduling after register
832 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
833 of stalled insns into the ready list.
835 flag_sched_stalled_insns_dep controls how many insn groups will be examined
836 for a dependency on a stalled insn that is candidate for premature removal
837 from the queue of stalled insns into the ready list (has an effect only if
838 the flag 'sched_stalled_insns' is set). */
840 int flag_sched_stalled_insns = 0;
841 int flag_sched_stalled_insns_dep = 1;
843 int flag_single_precision_constant;
845 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
846 by a cheaper branch on a count register. */
847 int flag_branch_on_count_reg = 1;
849 /* -finhibit-size-directive inhibits output of .size for ELF.
850 This is used only for compiling crtstuff.c,
851 and it may be extended to other effects
852 needed for crtstuff.c on other systems. */
853 int flag_inhibit_size_directive = 0;
855 /* -fverbose-asm causes extra commentary information to be produced in
856 the generated assembly code (to make it more readable). This option
857 is generally only of use to those who actually need to read the
858 generated assembly code (perhaps while debugging the compiler itself).
859 -fno-verbose-asm, the default, causes the extra information
860 to be omitted and is useful when comparing two assembler files. */
862 int flag_verbose_asm = 0;
864 /* -dA causes debug commentary information to be produced in
865 the generated assembly code (to make it more readable). This option
866 is generally only of use to those who actually need to read the
867 generated assembly code (perhaps while debugging the compiler itself).
868 Currently, this switch is only used by dwarfout.c; however, it is intended
869 to be a catchall for printing debug information in the assembler file. */
871 int flag_debug_asm = 0;
873 /* -dP causes the rtl to be emitted as a comment in assembly. */
875 int flag_dump_rtl_in_asm = 0;
877 /* -fgnu-linker specifies use of the GNU linker for initializations.
878 (Or, more generally, a linker that handles initializations.)
879 -fno-gnu-linker says that collect2 will be used. */
881 int flag_gnu_linker = 0;
883 int flag_gnu_linker = 1;
886 /* Nonzero means put zero initialized data in the bss section. */
887 int flag_zero_initialized_in_bss = 1;
892 /* Enable ssa conditional constant propagation. */
893 int flag_ssa_ccp = 0;
895 /* Enable ssa aggressive dead code elimination. */
896 int flag_ssa_dce = 0;
898 /* Tag all structures with __attribute__(packed). */
899 int flag_pack_struct = 0;
901 /* Emit code to check for stack overflow; also may cause large objects
902 to be allocated dynamically. */
903 int flag_stack_check;
905 /* When non-NULL, indicates that whenever space is allocated on the
906 stack, the resulting stack pointer must not pass this
907 address---that is, for stacks that grow downward, the stack pointer
908 must always be greater than or equal to this address; for stacks
909 that grow upward, the stack pointer must be less than this address.
910 At present, the rtx may be either a REG or a SYMBOL_REF, although
911 the support provided depends on the backend. */
914 /* 0 if pointer arguments may alias each other. True in C.
915 1 if pointer arguments may not alias each other but may alias
917 2 if pointer arguments may not alias each other and may not
918 alias global variables. True in Fortran.
919 This defaults to 0 for C. */
920 int flag_argument_noalias = 0;
922 /* Nonzero if we should do (language-dependent) alias analysis.
923 Typically, this analysis will assume that expressions of certain
924 types do not alias expressions of certain other types. Only used
925 if alias analysis (in general) is enabled. */
926 int flag_strict_aliasing = 0;
928 /* Instrument functions with calls at entry and exit, for profiling. */
929 int flag_instrument_function_entry_exit = 0;
931 /* Nonzero means ignore `#ident' directives. 0 means handle them.
932 On SVR4 targets, it also controls whether or not to emit a
933 string identifying the compiler. */
935 int flag_no_ident = 0;
937 /* This will perform a peephole pass before sched2. */
938 int flag_peephole2 = 0;
940 /* This will try to guess branch probabilities. */
941 int flag_guess_branch_prob = 0;
943 /* -fcheck-bounds causes gcc to generate array bounds checks.
944 For C, C++, ObjC: defaults to off.
945 For Java: defaults to on.
946 For Fortran: defaults to off. */
947 int flag_bounds_check = 0;
949 /* This will attempt to merge constant section constants, if 1 only
950 string constants and constants from constant pool, if 2 also constant
952 int flag_merge_constants = 1;
954 /* If one, renumber instruction UIDs to reduce the number of
955 unused UIDs if there are a lot of instructions. If greater than
956 one, unconditionally renumber instruction UIDs. */
957 int flag_renumber_insns = 1;
959 /* If nonzero, use the graph coloring register allocator. */
960 int flag_new_regalloc = 0;
962 /* Nonzero if we perform superblock formation. */
966 /* Nonzero if we perform whole unit at a time compilation. */
968 int flag_unit_at_a_time = 0;
970 /* Values of the -falign-* flags: how much to align labels in code.
971 0 means `use default', 1 means `don't align'.
972 For each variable, there is an _log variant which is the power
973 of two not less than the variable, for .align output. */
977 int align_loops_max_skip;
980 int align_jumps_max_skip;
982 int align_labels_log;
983 int align_labels_max_skip;
985 int align_functions_log;
987 /* Like align_functions_log above, but used by front-ends to force the
988 minimum function alignment. Zero means no alignment is forced. */
989 int force_align_functions_log;
993 const char *const string;
997 lang_independent_options;
999 /* Nonzero if signed arithmetic overflow should trap. */
1002 /* Nonzero if signed arithmetic overflow should wrap around. */
1005 /* Nonzero if subexpressions must be evaluated from left-to-right. */
1006 int flag_evaluation_order = 0;
1008 /* Add or remove a leading underscore from user symbols. */
1009 int flag_leading_underscore = -1;
1011 /* The user symbol prefix after having resolved same. */
1012 const char *user_label_prefix;
1014 static const param_info lang_independent_params[] = {
1015 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1016 { OPTION, DEFAULT, HELP },
1017 #include "params.def"
1022 /* Table of language-independent -f options.
1023 STRING is the option name. VARIABLE is the address of the variable.
1024 ON_VALUE is the value to store in VARIABLE
1025 if `-fSTRING' is seen as an option.
1026 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1028 static const lang_independent_options f_options[] =
1030 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1031 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1032 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1033 {"float-store", &flag_float_store, 1 },
1034 {"defer-pop", &flag_defer_pop, 1 },
1035 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1036 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1037 {"tracer", &flag_tracer, 1 },
1038 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1039 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1040 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1041 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1042 {"thread-jumps", &flag_thread_jumps, 1 },
1043 {"strength-reduce", &flag_strength_reduce, 1 },
1044 {"unroll-loops", &flag_unroll_loops, 1 },
1045 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1046 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1047 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1048 {"peel-loops", &flag_peel_loops, 1 },
1049 {"unswitch-loops", &flag_unswitch_loops, 1 },
1050 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1051 {"move-all-movables", &flag_move_all_movables, 1 },
1052 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1053 {"writable-strings", &flag_writable_strings, 1 },
1054 {"peephole", &flag_no_peephole, 0 },
1055 {"force-mem", &flag_force_mem, 1 },
1056 {"force-addr", &flag_force_addr, 1 },
1057 {"function-cse", &flag_no_function_cse, 0 },
1058 {"inline-functions", &flag_inline_functions, 1 },
1059 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1060 {"inline", &flag_no_inline, 0 },
1061 {"keep-static-consts", &flag_keep_static_consts, 1 },
1062 {"syntax-only", &flag_syntax_only, 1 },
1063 {"shared-data", &flag_shared_data, 1 },
1064 {"caller-saves", &flag_caller_saves, 1 },
1065 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1066 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1067 {"delayed-branch", &flag_delayed_branch, 1 },
1068 {"gcse", &flag_gcse, 1 },
1069 {"gcse-lm", &flag_gcse_lm, 1 },
1070 {"gcse-sm", &flag_gcse_sm, 1 },
1071 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1072 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1073 {"loop-optimize", &flag_loop_optimize, 1 },
1074 {"crossjumping", &flag_crossjumping, 1 },
1075 {"if-conversion", &flag_if_conversion, 1 },
1076 {"if-conversion2", &flag_if_conversion2, 1 },
1077 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1078 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1079 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1080 {"schedule-insns", &flag_schedule_insns, 1 },
1081 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1082 {"sched-interblock",&flag_schedule_interblock, 1 },
1083 {"sched-spec",&flag_schedule_speculative, 1 },
1084 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1085 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1086 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1087 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1088 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1089 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1090 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1091 {"pic", &flag_pic, 1 },
1092 {"PIC", &flag_pic, 2 },
1093 {"pie", &flag_pie, 1 },
1094 {"PIE", &flag_pie, 2 },
1095 {"exceptions", &flag_exceptions, 1 },
1096 {"unwind-tables", &flag_unwind_tables, 1 },
1097 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1098 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1099 {"profile-arcs", &profile_arc_flag, 1 },
1100 {"test-coverage", &flag_test_coverage, 1 },
1101 {"branch-probabilities", &flag_branch_probabilities, 1 },
1102 {"profile", &profile_flag, 1 },
1103 {"reorder-blocks", &flag_reorder_blocks, 1 },
1104 {"reorder-functions", &flag_reorder_functions, 1 },
1105 {"rename-registers", &flag_rename_registers, 1 },
1106 {"cprop-registers", &flag_cprop_registers, 1 },
1107 {"common", &flag_no_common, 0 },
1108 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1109 {"function-sections", &flag_function_sections, 1 },
1110 {"data-sections", &flag_data_sections, 1 },
1111 {"verbose-asm", &flag_verbose_asm, 1 },
1112 {"gnu-linker", &flag_gnu_linker, 1 },
1113 {"regmove", &flag_regmove, 1 },
1114 {"optimize-register-move", &flag_regmove, 1 },
1115 {"pack-struct", &flag_pack_struct, 1 },
1116 {"stack-check", &flag_stack_check, 1 },
1117 {"argument-alias", &flag_argument_noalias, 0 },
1118 {"argument-noalias", &flag_argument_noalias, 1 },
1119 {"argument-noalias-global", &flag_argument_noalias, 2 },
1120 {"strict-aliasing", &flag_strict_aliasing, 1 },
1121 {"align-loops", &align_loops, 0 },
1122 {"align-jumps", &align_jumps, 0 },
1123 {"align-labels", &align_labels, 0 },
1124 {"align-functions", &align_functions, 0 },
1125 {"merge-constants", &flag_merge_constants, 1 },
1126 {"merge-all-constants", &flag_merge_constants, 2 },
1127 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1128 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1129 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1130 {"ssa", &flag_ssa, 1 },
1131 {"ssa-ccp", &flag_ssa_ccp, 1 },
1132 {"ssa-dce", &flag_ssa_dce, 1 },
1133 {"leading-underscore", &flag_leading_underscore, 1 },
1134 {"ident", &flag_no_ident, 0 },
1135 { "peephole2", &flag_peephole2, 1 },
1136 {"finite-math-only", &flag_finite_math_only, 1 },
1137 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1138 {"math-errno", &flag_errno_math, 1 },
1139 {"trapping-math", &flag_trapping_math, 1 },
1140 {"rounding-math", &flag_rounding_math, 1 },
1141 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1142 {"signaling-nans", &flag_signaling_nans, 1 },
1143 {"bounds-check", &flag_bounds_check, 1 },
1144 {"single-precision-constant", &flag_single_precision_constant, 1 },
1145 {"time-report", &time_report, 1 },
1146 {"mem-report", &mem_report, 1 },
1147 { "trapv", &flag_trapv, 1 },
1148 { "wrapv", &flag_wrapv, 1 },
1149 { "new-ra", &flag_new_regalloc, 1 }
1152 /* Here is a table, controlled by the tm.h file, listing each -m switch
1153 and which bits in `target_switches' it should set or clear.
1154 If VALUE is positive, it is bits to set.
1155 If VALUE is negative, -VALUE is bits to clear.
1156 (The sign bit is not used so there is no confusion.) */
1160 const char *const name;
1162 const char *const description;
1164 target_switches[] = TARGET_SWITCHES;
1166 /* This table is similar, but allows the switch to have a value. */
1168 #ifdef TARGET_OPTIONS
1171 const char *const prefix;
1172 const char **const variable;
1173 const char *const description;
1174 const char *const value;
1176 target_options[] = TARGET_OPTIONS;
1179 /* Nonzero means warn about function definitions that default the return type
1180 or that use a null return and have a return-type other than void. */
1182 int warn_return_type;
1184 /* Output files for assembler code (real compiler output)
1185 and debugging dumps. */
1188 FILE *aux_info_file;
1189 FILE *rtl_dump_file = NULL;
1190 FILE *cgraph_dump_file = NULL;
1192 /* The current working directory of a translation. It's generally the
1193 directory from which compilation was initiated, but a preprocessed
1194 file may specify the original directory in which it was
1197 static const char *src_pwd;
1199 /* Initialize src_pwd with the given string, and return true. If it
1200 was already initialized, return false. As a special case, it may
1201 be called with a NULL argument to test whether src_pwd has NOT been
1205 set_src_pwd (const char *pwd)
1210 src_pwd = xstrdup (pwd);
1214 /* Return the directory from which the translation unit was initiated,
1215 in case set_src_pwd() was not called before to assign it a
1222 src_pwd = getpwd ();
1227 /* Called when the start of a function definition is parsed,
1228 this function prints on stderr the name of the function. */
1230 announce_function (tree decl)
1234 if (rtl_dump_and_exit)
1235 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1237 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1239 pp_needs_newline (global_dc->printer) = true;
1240 diagnostic_set_last_function (global_dc);
1244 /* Set up a default flag_random_seed and local_tick, unless the user
1245 already specified one. */
1250 if (!flag_random_seed)
1252 unsigned HOST_WIDE_INT value;
1253 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1255 /* Get some more or less random data. */
1256 #ifdef HAVE_GETTIMEOFDAY
1260 gettimeofday (&tv, NULL);
1261 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1265 time_t now = time (NULL);
1267 if (now != (time_t)-1)
1268 local_tick = (unsigned) now;
1271 value = local_tick ^ getpid ();
1273 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1274 flag_random_seed = random_seed;
1276 else if (!local_tick)
1281 /* Decode the string P as an integral parameter.
1282 If the string is indeed an integer return its numeric value else
1283 issue an Invalid Option error for the option PNAME and return DEFVAL.
1284 If PNAME is zero just return DEFVAL, do not call error. */
1287 read_integral_parameter (const char *p, const char *pname, const int defval)
1289 const char *endp = p;
1293 if (ISDIGIT (*endp))
1302 error ("invalid option argument `%s'", pname);
1309 /* Return the logarithm of X, base 2, considering X unsigned,
1310 if X is a power of 2. Otherwise, returns -1.
1312 This should be used via the `exact_log2' macro. */
1315 exact_log2_wide (unsigned HOST_WIDE_INT x)
1318 /* Test for 0 or a power of 2. */
1319 if (x == 0 || x != (x & -x))
1321 while ((x >>= 1) != 0)
1326 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1327 If X is 0, return -1.
1329 This should be used via the floor_log2 macro. */
1332 floor_log2_wide (unsigned HOST_WIDE_INT x)
1341 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1342 into ICE messages, which is much more user friendly. In case the
1343 error printer crashes, reset the signal to prevent infinite recursion. */
1346 crash_signal (int signo)
1348 signal (signo, SIG_DFL);
1349 internal_error ("%s", strsignal (signo));
1352 /* Arrange to dump core on error. (The regular error message is still
1353 printed first, except in the case of abort().) */
1356 setup_core_dumping (void)
1359 signal (SIGABRT, SIG_DFL);
1361 #if defined(HAVE_SETRLIMIT)
1364 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1365 fatal_error ("getting core file size maximum limit: %m");
1366 rlim.rlim_cur = rlim.rlim_max;
1367 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1368 fatal_error ("setting core file size limit to maximum: %m");
1371 diagnostic_abort_on_error (global_dc);
1375 /* Strip off a legitimate source ending from the input string NAME of
1376 length LEN. Rather than having to know the names used by all of
1377 our front ends, we strip off an ending of a period followed by
1378 up to five characters. (Java uses ".class".) */
1381 strip_off_ending (char *name, int len)
1384 for (i = 2; i < 6 && len > i; i++)
1386 if (name[len - i] == '.')
1388 name[len - i] = '\0';
1394 /* Output a quoted string. */
1397 output_quoted_string (FILE *asm_file, const char *string)
1399 #ifdef OUTPUT_QUOTED_STRING
1400 OUTPUT_QUOTED_STRING (asm_file, string);
1404 putc ('\"', asm_file);
1405 while ((c = *string++) != 0)
1409 if (c == '\"' || c == '\\')
1410 putc ('\\', asm_file);
1414 fprintf (asm_file, "\\%03o", (unsigned char) c);
1416 putc ('\"', asm_file);
1420 /* Output a file name in the form wanted by System V. */
1423 output_file_directive (FILE *asm_file, const char *input_name)
1425 int len = strlen (input_name);
1426 const char *na = input_name + len;
1428 /* NA gets INPUT_NAME sans directory names. */
1429 while (na > input_name)
1431 if (IS_DIR_SEPARATOR (na[-1]))
1436 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1437 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1439 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1440 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1442 fprintf (asm_file, "\t.file\t");
1443 output_quoted_string (asm_file, na);
1444 fputc ('\n', asm_file);
1449 /* Routine to open a dump file. Return true if the dump file is enabled. */
1452 open_dump_file (enum dump_file_index index, tree decl)
1455 const char *open_arg;
1458 if (! dump_file[index].enabled)
1461 timevar_push (TV_DUMP);
1462 if (rtl_dump_file != NULL)
1463 fclose (rtl_dump_file);
1465 sprintf (seq, DUMPFILE_FORMAT, index);
1467 if (! dump_file[index].initialized)
1469 /* If we've not initialized the files, do so now. */
1470 if (graph_dump_format != no_graph
1471 && dump_file[index].graph_dump_p)
1473 dump_name = concat (seq, dump_file[index].extension, NULL);
1474 clean_graph_dump_file (dump_base_name, dump_name);
1477 dump_file[index].initialized = 1;
1483 dump_name = concat (dump_base_name, seq,
1484 dump_file[index].extension, NULL);
1486 rtl_dump_file = fopen (dump_name, open_arg);
1487 if (rtl_dump_file == NULL)
1488 fatal_error ("can't open %s: %m", dump_name);
1493 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1494 (*lang_hooks.decl_printable_name) (decl, 2),
1495 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1497 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1498 ? " (unlikely executed)"
1501 timevar_pop (TV_DUMP);
1505 /* Routine to close a dump file. */
1508 close_dump_file (enum dump_file_index index,
1509 void (*func) (FILE *, rtx),
1512 if (! rtl_dump_file)
1515 timevar_push (TV_DUMP);
1517 && graph_dump_format != no_graph
1518 && dump_file[index].graph_dump_p)
1523 sprintf (seq, DUMPFILE_FORMAT, index);
1524 suffix = concat (seq, dump_file[index].extension, NULL);
1525 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1530 func (rtl_dump_file, insns);
1532 fflush (rtl_dump_file);
1533 fclose (rtl_dump_file);
1535 rtl_dump_file = NULL;
1536 timevar_pop (TV_DUMP);
1539 /* Do any final processing required for the declarations in VEC, of
1540 which there are LEN. We write out inline functions and variables
1541 that have been deferred until this point, but which are required.
1542 Returns nonzero if anything was put out. */
1545 wrapup_global_declarations (tree *vec, int len)
1550 int output_something = 0;
1552 for (i = 0; i < len; i++)
1556 /* We're not deferring this any longer. Assignment is
1557 conditional to avoid needlessly dirtying PCH pages. */
1558 if (DECL_DEFER_OUTPUT (decl) != 0)
1559 DECL_DEFER_OUTPUT (decl) = 0;
1561 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1562 (*lang_hooks.finish_incomplete_decl) (decl);
1565 /* Now emit any global variables or functions that we have been
1566 putting off. We need to loop in case one of the things emitted
1567 here references another one which comes earlier in the list. */
1571 for (i = 0; i < len; i++)
1575 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1578 /* Don't write out static consts, unless we still need them.
1580 We also keep static consts if not optimizing (for debugging),
1581 unless the user specified -fno-keep-static-consts.
1582 ??? They might be better written into the debug information.
1583 This is possible when using DWARF.
1585 A language processor that wants static constants to be always
1586 written out (even if it is not used) is responsible for
1587 calling rest_of_decl_compilation itself. E.g. the C front-end
1588 calls rest_of_decl_compilation from finish_decl.
1589 One motivation for this is that is conventional in some
1590 environments to write things like:
1591 static const char rcsid[] = "... version string ...";
1592 intending to force the string to be in the executable.
1594 A language processor that would prefer to have unneeded
1595 static constants "optimized away" would just defer writing
1596 them out until here. E.g. C++ does this, because static
1597 constants are often defined in header files.
1599 ??? A tempting alternative (for both C and C++) would be
1600 to force a constant to be written if and only if it is
1601 defined in a main file, as opposed to an include file. */
1603 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1607 if (flag_unit_at_a_time
1608 && cgraph_varpool_node (decl)->finalized)
1610 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1611 && (TREE_USED (decl)
1612 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1614 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1616 else if (DECL_COMDAT (decl))
1618 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1619 && (optimize || !flag_keep_static_consts
1620 || DECL_ARTIFICIAL (decl)))
1626 rest_of_decl_compilation (decl, NULL, 1, 1);
1630 if (TREE_CODE (decl) == FUNCTION_DECL
1631 && DECL_INITIAL (decl) != 0
1632 && DECL_SAVED_INSNS (decl) != 0
1633 && DECL_SAVED_INSNS (decl)->saved_for_inline
1634 && (flag_keep_inline_functions
1635 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1636 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1639 output_inline_function (decl);
1644 output_something = 1;
1648 return output_something;
1651 /* Issue appropriate warnings for the global declarations in VEC (of
1652 which there are LEN). Output debugging information for them. */
1655 check_global_declarations (tree *vec, int len)
1660 for (i = 0; i < len; i++)
1664 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1665 && ! TREE_ASM_WRITTEN (decl))
1666 /* Cancel the RTL for this decl so that, if debugging info
1667 output for global variables is still to come,
1668 this one will be omitted. */
1669 SET_DECL_RTL (decl, NULL_RTX);
1671 /* Warn about any function
1672 declared static but not defined.
1673 We don't warn about variables,
1674 because many programs have static variables
1675 that exist only to get some text into the object file. */
1676 if (TREE_CODE (decl) == FUNCTION_DECL
1677 && (warn_unused_function
1678 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1679 && DECL_INITIAL (decl) == 0
1680 && DECL_EXTERNAL (decl)
1681 && ! DECL_ARTIFICIAL (decl)
1682 && ! TREE_PUBLIC (decl))
1684 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1685 pedwarn ("%J'%F' used but never defined", decl, decl);
1687 warning ("%J'%F' declared `static' but never defined", decl, decl);
1688 /* This symbol is effectively an "extern" declaration now. */
1689 TREE_PUBLIC (decl) = 1;
1690 assemble_external (decl);
1693 /* Warn about static fns or vars defined but not used. */
1694 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1695 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1696 && ! TREE_USED (decl)
1697 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1698 to handle multiple external decls in different scopes. */
1699 && ! TREE_USED (DECL_NAME (decl))
1700 && ! DECL_EXTERNAL (decl)
1701 && ! TREE_PUBLIC (decl)
1702 /* A volatile variable might be used in some non-obvious way. */
1703 && ! TREE_THIS_VOLATILE (decl)
1704 /* Global register variables must be declared to reserve them. */
1705 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1706 /* Otherwise, ask the language. */
1707 && (*lang_hooks.decls.warn_unused_global) (decl))
1708 warning ("%J'%D' defined but not used", decl, decl);
1710 /* Avoid confusing the debug information machinery when there are
1712 if (errorcount == 0 && sorrycount == 0)
1714 timevar_push (TV_SYMOUT);
1715 (*debug_hooks->global_decl) (decl);
1716 timevar_pop (TV_SYMOUT);
1721 /* Warn about a use of an identifier which was marked deprecated. */
1723 warn_deprecated_use (tree node)
1725 if (node == 0 || !warn_deprecated_decl)
1729 warning ("`%s' is deprecated (declared at %s:%d)",
1730 IDENTIFIER_POINTER (DECL_NAME (node)),
1731 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1732 else if (TYPE_P (node))
1734 const char *what = NULL;
1735 tree decl = TYPE_STUB_DECL (node);
1737 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1738 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1739 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1740 && DECL_NAME (TYPE_NAME (node)))
1741 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1746 warning ("`%s' is deprecated (declared at %s:%d)", what,
1747 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1749 warning ("`%s' is deprecated", what);
1752 warning ("type is deprecated (declared at %s:%d)",
1753 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1755 warning ("type is deprecated");
1759 /* Save the current INPUT_LOCATION on the top entry in the
1760 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1761 INPUT_LOCATION accordingly. */
1764 push_srcloc (const char *file, int line)
1766 struct file_stack *fs;
1768 fs = xmalloc (sizeof (struct file_stack));
1769 fs->location = input_location;
1770 fs->next = input_file_stack;
1771 input_filename = file;
1773 input_file_stack = fs;
1774 input_file_stack_tick++;
1777 /* Pop the top entry off the stack of presently open source files.
1778 Restore the INPUT_LOCATION from the new topmost entry on the
1784 struct file_stack *fs;
1786 fs = input_file_stack;
1787 input_location = fs->location;
1788 input_file_stack = fs->next;
1790 input_file_stack_tick++;
1793 /* Compile an entire translation unit. Write a file of assembly
1794 output and various debugging dumps. */
1799 /* Initialize yet another pass. */
1801 init_final (main_input_filename);
1802 coverage_init (aux_base_name);
1804 timevar_push (TV_PARSE);
1806 /* Call the parser, which parses the entire file (calling
1807 rest_of_compilation for each function). */
1808 (*lang_hooks.parse_file) (set_yydebug);
1810 /* In case there were missing block closers,
1811 get us back to the global binding level. */
1812 (*lang_hooks.clear_binding_stack) ();
1814 /* Compilation is now finished except for writing
1815 what's left of the symbol table output. */
1816 timevar_pop (TV_PARSE);
1818 if (flag_syntax_only)
1821 (*lang_hooks.decls.final_write_globals)();
1823 cgraph_varpool_assemble_pending_decls ();
1825 /* This must occur after the loop to output deferred functions.
1826 Else the coverage initializer would not be emitted if all the
1827 functions in this compilation unit were deferred. */
1830 /* Write out any pending weak symbol declarations. */
1834 /* Do dbx symbols. */
1835 timevar_push (TV_SYMOUT);
1837 #ifdef DWARF2_UNWIND_INFO
1838 if (dwarf2out_do_frame ())
1839 dwarf2out_frame_finish ();
1842 (*debug_hooks->finish) (main_input_filename);
1843 timevar_pop (TV_SYMOUT);
1845 /* Output some stuff at end of file if nec. */
1847 dw2_output_indirect_constants ();
1849 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1851 timevar_push (TV_DUMP);
1852 open_dump_file (DFI_bp, NULL);
1856 close_dump_file (DFI_bp, NULL, NULL_RTX);
1857 timevar_pop (TV_DUMP);
1860 targetm.asm_out.file_end ();
1862 /* Attach a special .ident directive to the end of the file to identify
1863 the version of GCC which compiled this code. The format of the .ident
1864 string is patterned after the ones produced by native SVR4 compilers. */
1867 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1868 IDENT_ASM_OP, version_string);
1871 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1873 timevar_push (TV_DUMP);
1874 dump_combine_total_stats (rtl_dump_file);
1875 close_dump_file (DFI_combine, NULL, NULL_RTX);
1876 timevar_pop (TV_DUMP);
1880 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1881 and TYPE_DECL nodes.
1883 This does nothing for local (non-static) variables, unless the
1884 variable is a register variable with an ASMSPEC. In that case, or
1885 if the variable is not an automatic, it sets up the RTL and
1886 outputs any assembler code (label definition, storage allocation
1887 and initialization).
1889 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1890 the assembler symbol name to be used. TOP_LEVEL is nonzero
1891 if this declaration is not within a function. */
1894 rest_of_decl_compilation (tree decl,
1895 const char *asmspec,
1899 /* We deferred calling assemble_alias so that we could collect
1900 other attributes such as visibility. Emit the alias now. */
1903 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1906 alias = TREE_VALUE (TREE_VALUE (alias));
1907 alias = get_identifier (TREE_STRING_POINTER (alias));
1908 assemble_alias (decl, alias);
1912 /* Forward declarations for nested functions are not "external",
1913 but we need to treat them as if they were. */
1914 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1915 || TREE_CODE (decl) == FUNCTION_DECL)
1917 timevar_push (TV_VARCONST);
1920 make_decl_rtl (decl, asmspec);
1922 /* Don't output anything when a tentative file-scope definition
1923 is seen. But at end of compilation, do output code for them. */
1924 if ((at_end || !DECL_DEFER_OUTPUT (decl)) && !DECL_EXTERNAL (decl))
1926 if (flag_unit_at_a_time && !cgraph_global_info_ready
1927 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1928 cgraph_varpool_finalize_decl (decl);
1930 assemble_variable (decl, top_level, at_end, 0);
1933 #ifdef ASM_FINISH_DECLARE_OBJECT
1934 if (decl == last_assemble_variable_decl)
1936 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1941 timevar_pop (TV_VARCONST);
1943 else if (DECL_REGISTER (decl) && asmspec != 0)
1945 if (decode_reg_name (asmspec) >= 0)
1947 SET_DECL_RTL (decl, NULL_RTX);
1948 make_decl_rtl (decl, asmspec);
1952 error ("invalid register name `%s' for register variable", asmspec);
1953 DECL_REGISTER (decl) = 0;
1958 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1959 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1960 && TREE_CODE (decl) == TYPE_DECL)
1962 timevar_push (TV_SYMOUT);
1963 dbxout_symbol (decl, 0);
1964 timevar_pop (TV_SYMOUT);
1967 #ifdef SDB_DEBUGGING_INFO
1968 else if (write_symbols == SDB_DEBUG && top_level
1969 && TREE_CODE (decl) == TYPE_DECL)
1971 timevar_push (TV_SYMOUT);
1972 sdbout_symbol (decl, 0);
1973 timevar_pop (TV_SYMOUT);
1976 #ifdef DWARF2_DEBUGGING_INFO
1977 else if ((write_symbols == DWARF2_DEBUG
1978 || write_symbols == VMS_AND_DWARF2_DEBUG)
1980 && TREE_CODE (decl) == TYPE_DECL)
1982 timevar_push (TV_SYMOUT);
1983 dwarf2out_decl (decl);
1984 timevar_pop (TV_SYMOUT);
1989 /* Called after finishing a record, union or enumeral type. */
1992 rest_of_type_compilation (
1993 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1994 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1998 tree type ATTRIBUTE_UNUSED,
1999 int toplev ATTRIBUTE_UNUSED
2003 /* Avoid confusing the debug information machinery when there are
2005 if (errorcount != 0 || sorrycount != 0)
2008 timevar_push (TV_SYMOUT);
2009 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2010 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2011 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2013 #ifdef SDB_DEBUGGING_INFO
2014 if (write_symbols == SDB_DEBUG)
2015 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2017 #ifdef DWARF2_DEBUGGING_INFO
2018 if ((write_symbols == DWARF2_DEBUG
2019 || write_symbols == VMS_AND_DWARF2_DEBUG)
2021 dwarf2out_decl (TYPE_STUB_DECL (type));
2023 timevar_pop (TV_SYMOUT);
2026 /* Turn the RTL into assembly. */
2028 rest_of_handle_final (tree decl, rtx insns)
2030 timevar_push (TV_FINAL);
2035 /* Get the function's name, as described by its RTL. This may be
2036 different from the DECL_NAME name used in the source file. */
2038 x = DECL_RTL (decl);
2039 if (GET_CODE (x) != MEM)
2042 if (GET_CODE (x) != SYMBOL_REF)
2044 fnname = XSTR (x, 0);
2046 assemble_start_function (decl, fnname);
2047 final_start_function (insns, asm_out_file, optimize);
2048 final (insns, asm_out_file, optimize, 0);
2049 final_end_function ();
2051 #ifdef IA64_UNWIND_INFO
2052 /* ??? The IA-64 ".handlerdata" directive must be issued before
2053 the ".endp" directive that closes the procedure descriptor. */
2054 output_function_exception_table ();
2057 assemble_end_function (decl, fnname);
2059 #ifndef IA64_UNWIND_INFO
2060 /* Otherwise, it feels unclean to switch sections in the middle. */
2061 output_function_exception_table ();
2065 fflush (asm_out_file);
2067 /* Release all memory allocated by flow. */
2068 free_basic_block_vars (0);
2070 /* Release all memory held by regsets now. */
2071 regset_release_memory ();
2073 timevar_pop (TV_FINAL);
2079 /* Run delay slot optimization. */
2081 rest_of_handle_delay_slots (tree decl, rtx insns)
2083 timevar_push (TV_DBR_SCHED);
2084 open_dump_file (DFI_dbr, decl);
2086 dbr_schedule (insns, rtl_dump_file);
2088 close_dump_file (DFI_dbr, print_rtl, insns);
2089 timevar_pop (TV_DBR_SCHED);
2096 /* Convert register usage from flat register file usage to a stack
2099 rest_of_handle_stack_regs (tree decl, rtx insns)
2101 #if defined (HAVE_ATTR_length)
2102 /* If flow2 creates new instructions which need splitting
2103 and scheduling after reload is not done, they might not be
2104 splitten until final which doesn't allow splitting
2105 if HAVE_ATTR_length. */
2106 #ifdef INSN_SCHEDULING
2107 if (optimize && !flag_schedule_insns_after_reload)
2112 timevar_push (TV_SHORTEN_BRANCH);
2113 split_all_insns (1);
2114 timevar_pop (TV_SHORTEN_BRANCH);
2118 timevar_push (TV_REG_STACK);
2119 open_dump_file (DFI_stack, decl);
2121 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2123 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2124 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2125 && flag_reorder_blocks)
2127 reorder_basic_blocks ();
2128 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2132 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2133 timevar_pop (TV_REG_STACK);
2140 /* Machine independent reorg pass. */
2142 rest_of_handle_machine_reorg (tree decl, rtx insns)
2144 timevar_push (TV_MACH_DEP);
2145 open_dump_file (DFI_mach, decl);
2147 (*targetm.machine_dependent_reorg) ();
2149 close_dump_file (DFI_mach, print_rtl, insns);
2150 timevar_pop (TV_MACH_DEP);
2156 /* Run new register allocator. Return TRUE if we must exit
2157 rest_of_compilation upon return. */
2159 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2163 delete_trivially_dead_insns (insns, max_reg_num ());
2166 timevar_pop (TV_LOCAL_ALLOC);
2167 if (dump_file[DFI_lreg].enabled)
2169 timevar_push (TV_DUMP);
2171 close_dump_file (DFI_lreg, NULL, NULL);
2172 timevar_pop (TV_DUMP);
2175 /* XXX clean up the whole mess to bring live info in shape again. */
2176 timevar_push (TV_GLOBAL_ALLOC);
2177 open_dump_file (DFI_greg, decl);
2179 build_insn_chain (insns);
2180 failure = reload (insns, 0);
2182 timevar_pop (TV_GLOBAL_ALLOC);
2184 if (dump_file[DFI_greg].enabled)
2186 timevar_push (TV_DUMP);
2188 dump_global_regs (rtl_dump_file);
2190 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2191 timevar_pop (TV_DUMP);
2197 reload_completed = 1;
2203 /* Run old register allocator. Return TRUE if we must exit
2204 rest_of_compilation upon return. */
2206 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2210 /* Allocate the reg_renumber array. */
2211 allocate_reg_info (max_regno, FALSE, TRUE);
2213 /* And the reg_equiv_memory_loc array. */
2214 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2216 allocate_initial_values (reg_equiv_memory_loc);
2218 regclass (insns, max_reg_num (), rtl_dump_file);
2219 *rebuild_notes = local_alloc ();
2221 timevar_pop (TV_LOCAL_ALLOC);
2223 if (dump_file[DFI_lreg].enabled)
2225 timevar_push (TV_DUMP);
2227 dump_flow_info (rtl_dump_file);
2228 dump_local_alloc (rtl_dump_file);
2230 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2231 timevar_pop (TV_DUMP);
2236 timevar_push (TV_GLOBAL_ALLOC);
2237 open_dump_file (DFI_greg, decl);
2239 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2240 pass fixing up any insns that are invalid. */
2243 failure = global_alloc (rtl_dump_file);
2246 build_insn_chain (insns);
2247 failure = reload (insns, 0);
2250 timevar_pop (TV_GLOBAL_ALLOC);
2252 if (dump_file[DFI_greg].enabled)
2254 timevar_push (TV_DUMP);
2256 dump_global_regs (rtl_dump_file);
2258 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2259 timevar_pop (TV_DUMP);
2265 /* Run the regrename and cprop passes. */
2267 rest_of_handle_regrename (tree decl, rtx insns)
2269 timevar_push (TV_RENAME_REGISTERS);
2270 open_dump_file (DFI_rnreg, decl);
2272 if (flag_rename_registers)
2273 regrename_optimize ();
2274 if (flag_cprop_registers)
2275 copyprop_hardreg_forward ();
2277 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2278 timevar_pop (TV_RENAME_REGISTERS);
2281 /* Reorder basic blocks. */
2283 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2285 timevar_push (TV_REORDER_BLOCKS);
2286 open_dump_file (DFI_bbro, decl);
2288 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2289 splitting possibly introduced more crossjumping opportunities. */
2290 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2291 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2293 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2295 if (flag_reorder_blocks)
2296 reorder_basic_blocks ();
2297 if (flag_reorder_blocks
2298 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2299 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2301 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2302 timevar_pop (TV_REORDER_BLOCKS);
2305 #ifdef INSN_SCHEDULING
2306 /* Run instruction scheduler. */
2308 rest_of_handle_sched (tree decl, rtx insns)
2310 timevar_push (TV_SCHED);
2312 /* Print function header into sched dump now
2313 because doing the sched analysis makes some of the dump. */
2314 if (optimize > 0 && flag_schedule_insns)
2316 open_dump_file (DFI_sched, decl);
2318 /* Do control and data sched analysis,
2319 and write some of the results to dump file. */
2321 schedule_insns (rtl_dump_file);
2323 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2325 timevar_pop (TV_SCHED);
2330 /* Run second scheduling pass after reload. */
2332 rest_of_handle_sched2 (tree decl, rtx insns)
2334 timevar_push (TV_SCHED2);
2335 open_dump_file (DFI_sched2, decl);
2337 /* Do control and data sched analysis again,
2338 and write some more of the results to dump file. */
2340 split_all_insns (1);
2342 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2344 schedule_ebbs (rtl_dump_file);
2345 /* No liveness updating code yet, but it should be easy to do.
2346 reg-stack recompute the liveness when needed for now. */
2347 count_or_remove_death_notes (NULL, 1);
2348 cleanup_cfg (CLEANUP_EXPENSIVE);
2351 schedule_insns (rtl_dump_file);
2353 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2354 timevar_pop (TV_SCHED2);
2360 /* Register allocation pre-pass, to reduce number of moves necessary
2361 for two-address machines. */
2363 rest_of_handle_regmove (tree decl, rtx insns)
2365 timevar_push (TV_REGMOVE);
2366 open_dump_file (DFI_regmove, decl);
2368 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2370 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2371 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2372 timevar_pop (TV_REGMOVE);
2379 rest_of_handle_tracer (tree decl, rtx insns)
2381 timevar_push (TV_TRACER);
2382 open_dump_file (DFI_tracer, decl);
2384 dump_flow_info (rtl_dump_file);
2386 cleanup_cfg (CLEANUP_EXPENSIVE);
2387 reg_scan (insns, max_reg_num (), 0);
2388 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2389 timevar_pop (TV_TRACER);
2392 /* If-conversion and CFG cleanup. */
2394 rest_of_handle_if_conversion (tree decl, rtx insns)
2396 open_dump_file (DFI_ce1, decl);
2397 if (flag_if_conversion)
2399 timevar_push (TV_IFCVT);
2401 dump_flow_info (rtl_dump_file);
2402 cleanup_cfg (CLEANUP_EXPENSIVE);
2403 reg_scan (insns, max_reg_num (), 0);
2405 timevar_pop (TV_IFCVT);
2407 timevar_push (TV_JUMP);
2408 cleanup_cfg (CLEANUP_EXPENSIVE);
2409 reg_scan (insns, max_reg_num (), 0);
2410 timevar_pop (TV_JUMP);
2411 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2414 /* Rerun if-conversion, as combine may have simplified things enough
2415 to now meet sequence length restrictions. */
2417 rest_of_handle_if_after_combine (tree decl, rtx insns)
2419 timevar_push (TV_IFCVT);
2420 open_dump_file (DFI_ce2, decl);
2426 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2427 timevar_pop (TV_IFCVT);
2430 /* Do branch profiling and static profile estimation passes. */
2432 rest_of_handle_branch_prob (tree decl, rtx insns)
2436 timevar_push (TV_BRANCH_PROB);
2437 open_dump_file (DFI_bp, decl);
2438 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2441 /* Discover and record the loop depth at the head of each basic
2442 block. The loop infrastructure does the real job for us. */
2443 flow_loops_find (&loops, LOOP_TREE);
2446 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2448 /* Estimate using heuristics if no profiling info is available. */
2449 if (flag_guess_branch_prob)
2450 estimate_probability (&loops);
2452 flow_loops_free (&loops);
2453 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2454 timevar_pop (TV_BRANCH_PROB);
2457 /* Do control and data flow analysis; write some of the results to the
2460 rest_of_handle_cfg (tree decl, rtx insns)
2462 open_dump_file (DFI_cfg, decl);
2464 dump_flow_info (rtl_dump_file);
2466 cleanup_cfg (CLEANUP_EXPENSIVE
2467 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2469 /* It may make more sense to mark constant functions after dead code is
2470 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2471 may insert code making function non-constant, but we still must consider
2472 it as constant, otherwise -fbranch-probabilities will not read data back.
2474 life_analysis rarely eliminates modification of external memory.
2477 mark_constant_function ();
2479 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2482 /* Purge addressofs. */
2484 rest_of_handle_addressof (tree decl, rtx insns)
2486 open_dump_file (DFI_addressof, decl);
2488 purge_addressof (insns);
2489 if (optimize && purge_all_dead_edges (0))
2490 delete_unreachable_blocks ();
2491 reg_scan (insns, max_reg_num (), 1);
2493 close_dump_file (DFI_addressof, print_rtl, insns);
2496 /* We may have potential sibling or tail recursion sites. Select one
2497 (of possibly multiple) methods of performing the call. */
2499 rest_of_handle_sibling_calls (rtx insns)
2502 optimize_sibling_and_tail_recursive_calls ();
2504 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2505 free_bb_for_insn ();
2506 find_exception_handler_labels ();
2507 rebuild_jump_labels (insns);
2508 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2510 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2511 notes before simplifying cfg and we must do lowering after sibcall
2512 that unhides parts of RTL chain and cleans up the CFG.
2514 Until sibcall is replaced by tree-level optimizer, lets just
2515 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2516 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2517 if (GET_CODE (insn) == NOTE
2518 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2521 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2524 /* Perform jump bypassing and control flow optimizations. */
2526 rest_of_handle_jump_bypass (tree decl, rtx insns)
2528 timevar_push (TV_BYPASS);
2529 open_dump_file (DFI_bypass, decl);
2531 cleanup_cfg (CLEANUP_EXPENSIVE);
2533 if (bypass_jumps (rtl_dump_file))
2535 rebuild_jump_labels (insns);
2536 cleanup_cfg (CLEANUP_EXPENSIVE);
2537 delete_trivially_dead_insns (insns, max_reg_num ());
2540 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2541 timevar_pop (TV_BYPASS);
2545 #ifdef ENABLE_CHECKING
2546 verify_flow_info ();
2550 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2551 if we must exit rest_of_compilation upon return. */
2553 rest_of_handle_inlining (tree decl)
2560 /* If we are reconsidering an inline function at the end of
2561 compilation, skip the stuff for making it inline. */
2562 if (cfun->rtl_inline_init)
2564 cfun->rtl_inline_init = 1;
2566 /* If this is nested inside an inlined external function, pretend
2567 it was only declared. Since we cannot inline such functions,
2568 generating code for this one is not only not necessary but will
2569 confuse some debugging output writers. */
2570 for (parent = DECL_CONTEXT (current_function_decl);
2571 parent != NULL_TREE;
2572 parent = get_containing_scope (parent))
2573 if (TREE_CODE (parent) == FUNCTION_DECL
2574 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2576 DECL_INITIAL (decl) = 0;
2579 else if (TYPE_P (parent))
2580 /* A function in a local class should be treated normally. */
2583 /* If requested, consider whether to make this function inline. */
2584 if ((DECL_INLINE (decl) && !flag_no_inline)
2585 || flag_inline_functions)
2587 timevar_push (TV_INTEGRATION);
2588 lose = function_cannot_inline_p (decl);
2589 timevar_pop (TV_INTEGRATION);
2590 if (lose || ! optimize)
2592 if (warn_inline && lose && DECL_INLINE (decl))
2594 char *msg = concat ("%J", lose, NULL);
2595 warning (msg, decl);
2598 DECL_ABSTRACT_ORIGIN (decl) = 0;
2599 /* Don't really compile an extern inline function.
2600 If we can't make it inline, pretend
2601 it was only declared. */
2602 if (DECL_EXTERNAL (decl))
2604 DECL_INITIAL (decl) = 0;
2609 inlinable = DECL_INLINE (decl) = 1;
2612 insns = get_insns ();
2614 /* Dump the rtl code if we are dumping rtl. */
2616 if (open_dump_file (DFI_rtl, decl))
2618 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2619 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2620 close_dump_file (DFI_rtl, print_rtl, insns);
2623 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2624 sorts of eh initialization. Delay this until after the
2625 initial rtl dump so that we can see the original nesting. */
2626 convert_from_eh_region_ranges ();
2628 /* If function is inline, and we don't yet know whether to
2629 compile it by itself, defer decision till end of compilation.
2630 wrapup_global_declarations will (indirectly) call
2631 rest_of_compilation again for those functions that need to
2632 be output. Also defer those functions that we are supposed
2636 || (DECL_INLINE (decl)
2637 && flag_inline_functions
2638 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2639 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2640 && ! flag_keep_inline_functions)
2641 || DECL_EXTERNAL (decl))))
2642 DECL_DEFER_OUTPUT (decl) = 1;
2644 if (DECL_INLINE (decl))
2645 /* DWARF wants separate debugging info for abstract and
2646 concrete instances of all inline functions, including those
2647 declared inline but not inlined, and those inlined even
2648 though they weren't declared inline. Conveniently, that's
2649 what DECL_INLINE means at this point. */
2650 (*debug_hooks->deferred_inline_function) (decl);
2652 if (DECL_DEFER_OUTPUT (decl))
2654 /* If -Wreturn-type, we have to do a bit of compilation. We just
2655 want to call cleanup the cfg to figure out whether or not we can
2656 fall off the end of the function; we do the minimum amount of
2657 work necessary to make that safe. */
2658 if (warn_return_type)
2660 int saved_optimize = optimize;
2663 rebuild_jump_labels (insns);
2664 find_exception_handler_labels ();
2665 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2666 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2667 optimize = saved_optimize;
2669 /* CFG is no longer maintained up-to-date. */
2670 free_bb_for_insn ();
2673 set_nothrow_function_flags ();
2674 if (current_function_nothrow)
2675 /* Now we know that this can't throw; set the flag for the benefit
2676 of other functions later in this translation unit. */
2677 TREE_NOTHROW (current_function_decl) = 1;
2679 timevar_push (TV_INTEGRATION);
2680 save_for_inline (decl);
2681 timevar_pop (TV_INTEGRATION);
2682 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2686 /* If specified extern inline but we aren't inlining it, we are
2687 done. This goes for anything that gets here with DECL_EXTERNAL
2688 set, not just things with DECL_INLINE. */
2689 return (bool) DECL_EXTERNAL (decl);
2692 /* Rest of compilation helper to convert the rtl to SSA form. */
2694 rest_of_handle_ssa (tree decl, rtx insns)
2696 timevar_push (TV_TO_SSA);
2697 open_dump_file (DFI_ssa, decl);
2699 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2702 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2703 timevar_pop (TV_TO_SSA);
2705 /* Perform sparse conditional constant propagation, if requested. */
2708 timevar_push (TV_SSA_CCP);
2709 open_dump_file (DFI_ssa_ccp, decl);
2713 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2714 timevar_pop (TV_SSA_CCP);
2717 /* It would be useful to cleanup the CFG at this point, but block
2718 merging and possibly other transformations might leave a PHI
2719 node in the middle of a basic block, which is a strict no-no. */
2721 /* The SSA implementation uses basic block numbers in its phi
2722 nodes. Thus, changing the control-flow graph or the basic
2723 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2724 may cause problems. */
2728 /* Remove dead code. */
2730 timevar_push (TV_SSA_DCE);
2731 open_dump_file (DFI_ssa_dce, decl);
2733 insns = get_insns ();
2734 ssa_eliminate_dead_code ();
2736 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2737 timevar_pop (TV_SSA_DCE);
2740 /* Convert from SSA form. */
2742 timevar_push (TV_FROM_SSA);
2743 open_dump_file (DFI_ussa, decl);
2745 convert_from_ssa ();
2746 /* New registers have been created. Rescan their usage. */
2747 reg_scan (insns, max_reg_num (), 1);
2749 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2750 timevar_pop (TV_FROM_SSA);
2757 /* Try to identify useless null pointer tests and delete them. */
2759 rest_of_handle_null_pointer (tree decl, rtx insns)
2761 open_dump_file (DFI_null, decl);
2763 dump_flow_info (rtl_dump_file);
2765 if (delete_null_pointer_checks (insns))
2766 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2768 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2771 /* Try combining insns through substitution. */
2773 rest_of_handle_combine (tree decl, rtx insns)
2775 int rebuild_jump_labels_after_combine = 0;
2777 timevar_push (TV_COMBINE);
2778 open_dump_file (DFI_combine, decl);
2780 rebuild_jump_labels_after_combine
2781 = combine_instructions (insns, max_reg_num ());
2783 /* Combining insns may have turned an indirect jump into a
2784 direct jump. Rebuild the JUMP_LABEL fields of jumping
2786 if (rebuild_jump_labels_after_combine)
2788 timevar_push (TV_JUMP);
2789 rebuild_jump_labels (insns);
2790 timevar_pop (TV_JUMP);
2792 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2795 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2796 timevar_pop (TV_COMBINE);
2801 /* Perform life analysis. */
2803 rest_of_handle_life (tree decl, rtx insns)
2805 open_dump_file (DFI_life, decl);
2808 #ifdef ENABLE_CHECKING
2809 verify_flow_info ();
2811 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2813 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2814 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2815 timevar_pop (TV_FLOW);
2817 if (warn_uninitialized)
2819 uninitialized_vars_warning (DECL_INITIAL (decl));
2821 setjmp_args_warning ();
2826 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2828 /* Insns were inserted, and possibly pseudos created, so
2829 things might look a bit different. */
2830 insns = get_insns ();
2831 allocate_reg_life_data ();
2832 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2833 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2839 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2844 /* Perform common subexpression elimination. Nonzero value from
2845 `cse_main' means that jumps were simplified and some code may now
2846 be unreachable, so do jump optimization again. */
2848 rest_of_handle_cse (tree decl, rtx insns)
2852 open_dump_file (DFI_cse, decl);
2854 dump_flow_info (rtl_dump_file);
2855 timevar_push (TV_CSE);
2857 reg_scan (insns, max_reg_num (), 1);
2859 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2861 rebuild_jump_labels (insns);
2862 if (purge_all_dead_edges (0))
2863 delete_unreachable_blocks ();
2865 delete_trivially_dead_insns (insns, max_reg_num ());
2867 /* If we are not running more CSE passes, then we are no longer
2868 expecting CSE to be run. But always rerun it in a cheap mode. */
2869 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2871 if (tem || optimize > 1)
2872 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2873 /* Try to identify useless null pointer tests and delete them. */
2874 if (flag_delete_null_pointer_checks)
2876 timevar_push (TV_JUMP);
2878 if (delete_null_pointer_checks (insns))
2879 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2880 timevar_pop (TV_JUMP);
2883 /* The second pass of jump optimization is likely to have
2884 removed a bunch more instructions. */
2885 renumber_insns (rtl_dump_file);
2887 timevar_pop (TV_CSE);
2888 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2891 /* Run second CSE pass after loop optimizations. */
2893 rest_of_handle_cse2 (tree decl, rtx insns)
2897 timevar_push (TV_CSE2);
2898 open_dump_file (DFI_cse2, decl);
2900 dump_flow_info (rtl_dump_file);
2901 /* CFG is no longer maintained up-to-date. */
2902 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2903 purge_all_dead_edges (0);
2904 delete_trivially_dead_insns (insns, max_reg_num ());
2908 timevar_push (TV_JUMP);
2909 rebuild_jump_labels (insns);
2910 cleanup_cfg (CLEANUP_EXPENSIVE);
2911 timevar_pop (TV_JUMP);
2913 reg_scan (insns, max_reg_num (), 0);
2914 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2916 timevar_pop (TV_CSE2);
2919 /* Perform global cse. */
2921 rest_of_handle_gcse (tree decl, rtx insns)
2923 int save_csb, save_cfj;
2926 timevar_push (TV_GCSE);
2927 open_dump_file (DFI_gcse, decl);
2929 tem = gcse_main (insns, rtl_dump_file);
2930 rebuild_jump_labels (insns);
2931 delete_trivially_dead_insns (insns, max_reg_num ());
2933 save_csb = flag_cse_skip_blocks;
2934 save_cfj = flag_cse_follow_jumps;
2935 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2937 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2938 if (current_function_calls_constant_p)
2939 purge_builtin_constant_p ();
2941 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2943 if (flag_expensive_optimizations)
2945 timevar_push (TV_CSE);
2946 reg_scan (insns, max_reg_num (), 1);
2947 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2948 purge_all_dead_edges (0);
2949 delete_trivially_dead_insns (insns, max_reg_num ());
2950 timevar_pop (TV_CSE);
2951 cse_not_expected = !flag_rerun_cse_after_loop;
2954 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2955 things up. Then possibly re-run CSE again. */
2959 timevar_push (TV_JUMP);
2960 rebuild_jump_labels (insns);
2961 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2962 timevar_pop (TV_JUMP);
2964 if (flag_expensive_optimizations)
2966 timevar_push (TV_CSE);
2967 reg_scan (insns, max_reg_num (), 1);
2968 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2969 purge_all_dead_edges (0);
2970 delete_trivially_dead_insns (insns, max_reg_num ());
2971 timevar_pop (TV_CSE);
2975 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2976 timevar_pop (TV_GCSE);
2979 flag_cse_skip_blocks = save_csb;
2980 flag_cse_follow_jumps = save_cfj;
2981 #ifdef ENABLE_CHECKING
2982 verify_flow_info ();
2986 /* Move constant computations out of loops. */
2988 rest_of_handle_loop_optimize (tree decl, rtx insns)
2990 int do_unroll, do_prefetch;
2992 timevar_push (TV_LOOP);
2993 delete_dead_jumptables ();
2994 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2995 open_dump_file (DFI_loop, decl);
2997 /* CFG is no longer maintained up-to-date. */
2998 free_bb_for_insn ();
3000 if (flag_unroll_loops)
3001 do_unroll = 0; /* Having two unrollers is useless. */
3003 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3004 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3006 if (flag_rerun_loop_opt)
3008 cleanup_barriers ();
3010 /* We only want to perform unrolling once. */
3011 loop_optimize (insns, rtl_dump_file, do_unroll);
3014 /* The first call to loop_optimize makes some instructions
3015 trivially dead. We delete those instructions now in the
3016 hope that doing so will make the heuristics in loop work
3017 better and possibly speed up compilation. */
3018 delete_trivially_dead_insns (insns, max_reg_num ());
3020 /* The regscan pass is currently necessary as the alias
3021 analysis code depends on this information. */
3022 reg_scan (insns, max_reg_num (), 1);
3024 cleanup_barriers ();
3025 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3027 /* Loop can create trivially dead instructions. */
3028 delete_trivially_dead_insns (insns, max_reg_num ());
3029 close_dump_file (DFI_loop, print_rtl, insns);
3030 timevar_pop (TV_LOOP);
3031 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3036 /* Perform loop optimizations. It might be better to do them a bit
3037 sooner, but we want the profile feedback to work more
3040 rest_of_handle_loop2 (tree decl, rtx insns)
3042 struct loops *loops;
3043 timevar_push (TV_LOOP);
3044 open_dump_file (DFI_loop2, decl);
3046 dump_flow_info (rtl_dump_file);
3048 loops = loop_optimizer_init (rtl_dump_file);
3052 /* The optimizations: */
3053 if (flag_unswitch_loops)
3054 unswitch_loops (loops);
3056 if (flag_peel_loops || flag_unroll_loops)
3057 unroll_and_peel_loops (loops,
3058 (flag_peel_loops ? UAP_PEEL : 0) |
3059 (flag_unroll_loops ? UAP_UNROLL : 0) |
3060 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3062 loop_optimizer_finalize (loops, rtl_dump_file);
3065 cleanup_cfg (CLEANUP_EXPENSIVE);
3066 delete_trivially_dead_insns (insns, max_reg_num ());
3067 reg_scan (insns, max_reg_num (), 0);
3069 dump_flow_info (rtl_dump_file);
3070 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3071 timevar_pop (TV_LOOP);
3075 /* This is called from finish_function (within langhooks.parse_file)
3076 after each top-level definition is parsed.
3077 It is supposed to compile that function or variable
3078 and output the assembler code for it.
3079 After we return, the tree storage is freed. */
3082 rest_of_compilation (tree decl)
3085 int rebuild_label_notes_after_reload;
3087 timevar_push (TV_REST_OF_COMPILATION);
3089 /* Register rtl specific functions for cfg. */
3090 rtl_register_cfg_hooks ();
3092 /* Now that we're out of the frontend, we shouldn't have any more
3093 CONCATs anywhere. */
3094 generating_concat_p = 0;
3096 /* When processing delayed functions, prepare_function_start() won't
3097 have been run to re-initialize it. */
3098 cse_not_expected = ! optimize;
3100 /* First, make sure that NOTE_BLOCK is set correctly for each
3101 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3102 if (!cfun->x_whole_function_mode_p)
3105 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3106 tree in sensible shape. So, we just recalculate it here. */
3107 if (cfun->x_whole_function_mode_p)
3112 if (rest_of_handle_inlining (decl))
3113 goto exit_rest_of_compilation;
3115 /* If we're emitting a nested function, make sure its parent gets
3116 emitted as well. Doing otherwise confuses debug info. */
3119 for (parent = DECL_CONTEXT (current_function_decl);
3120 parent != NULL_TREE;
3121 parent = get_containing_scope (parent))
3122 if (TREE_CODE (parent) == FUNCTION_DECL)
3123 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3126 /* We are now committed to emitting code for this function. Do any
3127 preparation, such as emitting abstract debug info for the inline
3128 before it gets mangled by optimization. */
3129 if (DECL_INLINE (decl))
3130 (*debug_hooks->outlining_inline_function) (decl);
3132 /* Remove any notes we don't need. That will make iterating
3133 over the instruction sequence faster, and allow the garbage
3134 collector to reclaim the memory used by the notes. */
3135 remove_unnecessary_notes ();
3140 /* Initialize some variables used by the optimizers. */
3141 init_function_for_compilation ();
3143 if (! DECL_DEFER_OUTPUT (decl))
3144 TREE_ASM_WRITTEN (decl) = 1;
3146 /* Now that integrate will no longer see our rtl, we need not
3147 distinguish between the return value of this function and the
3148 return value of called functions. Also, we can remove all SETs
3149 of subregs of hard registers; they are only here because of
3150 integrate. Also, we can now initialize pseudos intended to
3151 carry magic hard reg data throughout the function. */
3152 rtx_equal_function_value_matters = 0;
3153 purge_hard_subreg_sets (get_insns ());
3155 /* Early return if there were errors. We can run afoul of our
3156 consistency checks, and there's not really much point in fixing them.
3157 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3158 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3159 || errorcount || sorrycount)
3160 goto exit_rest_of_compilation;
3162 timevar_push (TV_JUMP);
3163 open_dump_file (DFI_sibling, decl);
3164 insns = get_insns ();
3165 rebuild_jump_labels (insns);
3166 find_exception_handler_labels ();
3167 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3169 delete_unreachable_blocks ();
3171 /* We have to issue these warnings now already, because CFG cleanups
3172 further down may destroy the required information. */
3173 check_function_return_warnings ();
3175 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3176 if (flag_guess_branch_prob)
3178 timevar_push (TV_BRANCH_PROB);
3179 note_prediction_to_br_prob ();
3180 timevar_pop (TV_BRANCH_PROB);
3183 if (flag_optimize_sibling_calls)
3184 rest_of_handle_sibling_calls (insns);
3186 timevar_pop (TV_JUMP);
3188 insn_locators_initialize ();
3189 /* Complete generation of exception handling code. */
3192 timevar_push (TV_JUMP);
3193 open_dump_file (DFI_eh, decl);
3195 finish_eh_generation ();
3197 close_dump_file (DFI_eh, print_rtl, get_insns ());
3198 timevar_pop (TV_JUMP);
3201 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3202 generation, which might create new sets. */
3203 emit_initial_value_sets ();
3206 /* If we are doing position-independent code generation, now
3207 is the time to output special prologues and epilogues.
3208 We do not want to do this earlier, because it just clutters
3209 up inline functions with meaningless insns. */
3214 insns = get_insns ();
3216 /* Copy any shared structure that should not be shared. */
3217 unshare_all_rtl (current_function_decl, insns);
3219 #ifdef SETJMP_VIA_SAVE_AREA
3220 /* This must be performed before virtual register instantiation.
3221 Please be aware the everything in the compiler that can look
3222 at the RTL up to this point must understand that REG_SAVE_AREA
3223 is just like a use of the REG contained inside. */
3224 if (current_function_calls_alloca)
3225 optimize_save_area_alloca (insns);
3228 /* Instantiate all virtual registers. */
3229 instantiate_virtual_regs (current_function_decl, insns);
3231 open_dump_file (DFI_jump, decl);
3233 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3234 are initialized and to compute whether control can drop off the end
3237 timevar_push (TV_JUMP);
3238 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3239 before jump optimization switches branch directions. */
3240 if (flag_guess_branch_prob)
3241 expected_value_to_br_prob ();
3243 reg_scan (insns, max_reg_num (), 0);
3244 rebuild_jump_labels (insns);
3245 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3246 delete_trivially_dead_insns (insns, max_reg_num ());
3248 dump_flow_info (rtl_dump_file);
3249 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3250 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3254 free_bb_for_insn ();
3255 copy_loop_headers (insns);
3256 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3258 purge_line_number_notes (insns);
3260 timevar_pop (TV_JUMP);
3261 close_dump_file (DFI_jump, print_rtl, insns);
3263 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3264 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3265 goto exit_rest_of_compilation;
3267 /* Long term, this should probably move before the jump optimizer too,
3268 but I didn't want to disturb the rtl_dump_and_exit and related
3269 stuff at this time. */
3270 if (optimize > 0 && flag_ssa)
3271 insns = rest_of_handle_ssa (decl, insns);
3273 timevar_push (TV_JUMP);
3276 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3278 if (flag_delete_null_pointer_checks)
3279 rest_of_handle_null_pointer (decl, insns);
3281 /* Jump optimization, and the removal of NULL pointer checks, may
3282 have reduced the number of instructions substantially. CSE, and
3283 future passes, allocate arrays whose dimensions involve the
3284 maximum instruction UID, so if we can reduce the maximum UID
3285 we'll save big on memory. */
3286 renumber_insns (rtl_dump_file);
3287 timevar_pop (TV_JUMP);
3289 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3294 rest_of_handle_cse (decl, insns);
3296 rest_of_handle_addressof (decl, insns);
3303 rest_of_handle_gcse (decl, insns);
3305 if (flag_loop_optimize)
3306 rest_of_handle_loop_optimize (decl, insns);
3309 rest_of_handle_jump_bypass (decl, insns);
3312 timevar_push (TV_FLOW);
3314 rest_of_handle_cfg (decl, insns);
3317 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3318 rest_of_handle_branch_prob (decl, insns);
3321 rest_of_handle_if_conversion (decl, insns);
3324 rest_of_handle_tracer (decl, insns);
3327 && (flag_unswitch_loops
3329 || flag_unroll_loops))
3330 rest_of_handle_loop2 (decl, insns);
3332 if (flag_rerun_cse_after_loop)
3333 rest_of_handle_cse2 (decl, insns);
3335 cse_not_expected = 1;
3337 rest_of_handle_life (decl, insns);
3340 rest_of_handle_combine (decl, insns);
3342 if (flag_if_conversion)
3343 rest_of_handle_if_after_combine (decl, insns);
3345 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3346 rest_of_handle_regmove (decl, insns);
3348 /* Do unconditional splitting before register allocation to allow machine
3349 description to add extra information not needed previously. */
3350 split_all_insns (1);
3352 #ifdef OPTIMIZE_MODE_SWITCHING
3353 timevar_push (TV_MODE_SWITCH);
3356 optimize_mode_switching (NULL);
3359 timevar_pop (TV_MODE_SWITCH);
3362 /* Any of the several passes since flow1 will have munged register
3363 lifetime data a bit. We need it to be up to date for scheduling
3364 (see handling of reg_known_equiv in init_alias_analysis). */
3365 recompute_reg_usage (insns, !optimize_size);
3367 #ifdef INSN_SCHEDULING
3368 rest_of_handle_sched (decl, insns);
3371 /* Determine if the current function is a leaf before running reload
3372 since this can impact optimizations done by the prologue and
3373 epilogue thus changing register elimination offsets. */
3374 current_function_is_leaf = leaf_function_p ();
3376 timevar_push (TV_LOCAL_ALLOC);
3377 open_dump_file (DFI_lreg, decl);
3379 if (flag_new_regalloc)
3381 if (rest_of_handle_new_regalloc (decl, insns,
3382 &rebuild_label_notes_after_reload))
3383 goto exit_rest_of_compilation;
3387 if (rest_of_handle_old_regalloc (decl, insns,
3388 &rebuild_label_notes_after_reload))
3389 goto exit_rest_of_compilation;
3394 open_dump_file (DFI_postreload, decl);
3396 /* Do a very simple CSE pass over just the hard registers. */
3399 timevar_push (TV_RELOAD_CSE_REGS);
3400 reload_cse_regs (insns);
3401 timevar_pop (TV_RELOAD_CSE_REGS);
3404 /* Register allocation and reloading may have turned an indirect jump into
3405 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3406 jumping instructions. */
3407 if (rebuild_label_notes_after_reload)
3409 timevar_push (TV_JUMP);
3411 rebuild_jump_labels (insns);
3412 purge_all_dead_edges (0);
3414 timevar_pop (TV_JUMP);
3417 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3419 /* Re-create the death notes which were deleted during reload. */
3420 timevar_push (TV_FLOW2);
3421 open_dump_file (DFI_flow2, decl);
3423 #ifdef ENABLE_CHECKING
3424 verify_flow_info ();
3427 /* If optimizing, then go ahead and split insns now. */
3431 split_all_insns (0);
3433 if (flag_branch_target_load_optimize)
3435 open_dump_file (DFI_branch_target_load, decl);
3437 branch_target_load_optimize (insns, false);
3439 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3445 cleanup_cfg (CLEANUP_EXPENSIVE);
3447 /* On some machines, the prologue and epilogue code, or parts thereof,
3448 can be represented as RTL. Doing so lets us schedule insns between
3449 it and the rest of the code and also allows delayed branch
3450 scheduling to operate in the epilogue. */
3451 thread_prologue_and_epilogue_insns (insns);
3452 epilogue_completed = 1;
3456 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3457 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3458 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3460 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3461 even for machines with possibly nonzero RETURN_POPS_ARGS
3462 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3463 push instructions will have popping returns. */
3464 #ifndef PUSH_ROUNDING
3465 if (!ACCUMULATE_OUTGOING_ARGS)
3467 combine_stack_adjustments ();
3472 flow2_completed = 1;
3474 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3475 timevar_pop (TV_FLOW2);
3477 #ifdef HAVE_peephole2
3478 if (optimize > 0 && flag_peephole2)
3480 timevar_push (TV_PEEPHOLE2);
3481 open_dump_file (DFI_peephole2, decl);
3483 peephole2_optimize (rtl_dump_file);
3485 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3486 timevar_pop (TV_PEEPHOLE2);
3492 if (flag_rename_registers || flag_cprop_registers)
3493 rest_of_handle_regrename (decl, insns);
3495 rest_of_handle_reorder_blocks (decl, insns);
3498 if (flag_if_conversion2)
3500 timevar_push (TV_IFCVT2);
3501 open_dump_file (DFI_ce3, decl);
3505 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3506 timevar_pop (TV_IFCVT2);
3509 if (flag_branch_target_load_optimize2)
3511 /* Leave this a warning for now so that it is possible to experiment
3512 with running this pass twice. In 3.6, we should either make this
3513 an error, or use separate dump files. */
3514 if (flag_branch_target_load_optimize)
3515 warning ("branch target register load optimization is not intended "
3518 open_dump_file (DFI_branch_target_load, decl);
3520 branch_target_load_optimize (insns, true);
3522 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3527 #ifdef INSN_SCHEDULING
3528 if (optimize > 0 && flag_schedule_insns_after_reload)
3529 rest_of_handle_sched2 (decl, insns);
3532 #ifdef LEAF_REGISTERS
3533 current_function_uses_only_leaf_regs
3534 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3538 rest_of_handle_stack_regs (decl, insns);
3541 compute_alignments ();
3543 /* CFG is no longer maintained up-to-date. */
3544 free_bb_for_insn ();
3546 if (targetm.machine_dependent_reorg != 0)
3547 rest_of_handle_machine_reorg (decl, insns);
3549 purge_line_number_notes (insns);
3550 cleanup_barriers ();
3553 if (optimize > 0 && flag_delayed_branch)
3554 rest_of_handle_delay_slots (decl, insns);
3557 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3558 timevar_push (TV_SHORTEN_BRANCH);
3559 split_all_insns_noflow ();
3560 timevar_pop (TV_SHORTEN_BRANCH);
3563 convert_to_eh_region_ranges ();
3565 /* Shorten branches. */
3566 timevar_push (TV_SHORTEN_BRANCH);
3567 shorten_branches (get_insns ());
3568 timevar_pop (TV_SHORTEN_BRANCH);
3570 set_nothrow_function_flags ();
3571 if (current_function_nothrow)
3572 /* Now we know that this can't throw; set the flag for the benefit
3573 of other functions later in this translation unit. */
3574 TREE_NOTHROW (current_function_decl) = 1;
3576 rest_of_handle_final (decl, insns);
3578 /* Write DBX symbols if requested. */
3580 /* Note that for those inline functions where we don't initially
3581 know for certain that we will be generating an out-of-line copy,
3582 the first invocation of this routine (rest_of_compilation) will
3583 skip over this code by doing a `goto exit_rest_of_compilation;'.
3584 Later on, wrapup_global_declarations will (indirectly) call
3585 rest_of_compilation again for those inline functions that need
3586 to have out-of-line copies generated. During that call, we
3587 *will* be routed past here. */
3589 timevar_push (TV_SYMOUT);
3590 (*debug_hooks->function_decl) (decl);
3591 timevar_pop (TV_SYMOUT);
3593 exit_rest_of_compilation:
3595 coverage_end_function ();
3597 /* In case the function was not output,
3598 don't leave any temporary anonymous types
3599 queued up for sdb output. */
3600 #ifdef SDB_DEBUGGING_INFO
3601 if (write_symbols == SDB_DEBUG)
3602 sdbout_types (NULL_TREE);
3605 reload_completed = 0;
3606 epilogue_completed = 0;
3607 flow2_completed = 0;
3610 timevar_push (TV_FINAL);
3612 /* Clear out the insn_length contents now that they are no
3614 init_insn_lengths ();
3616 /* Show no temporary slots allocated. */
3619 free_basic_block_vars (0);
3620 free_bb_for_insn ();
3622 timevar_pop (TV_FINAL);
3624 if ((*targetm.binds_local_p) (current_function_decl))
3626 int pref = cfun->preferred_stack_boundary;
3627 if (cfun->recursive_call_emit
3628 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3629 pref = cfun->stack_alignment_needed;
3630 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3634 /* Make sure volatile mem refs aren't considered valid operands for
3635 arithmetic insns. We must call this here if this is a nested inline
3636 function, since the above code leaves us in the init_recog state
3637 (from final.c), and the function context push/pop code does not
3638 save/restore volatile_ok.
3640 ??? Maybe it isn't necessary for expand_start_function to call this
3641 anymore if we do it here? */
3643 init_recog_no_volatile ();
3645 /* We're done with this function. Free up memory if we can. */
3646 free_after_parsing (cfun);
3647 if (! DECL_DEFER_OUTPUT (decl))
3649 free_after_compilation (cfun);
3650 DECL_SAVED_INSNS (decl) = 0;
3656 timevar_pop (TV_REST_OF_COMPILATION);
3659 /* Display help for target options. */
3661 display_target_options (void)
3664 static bool displayed = false;
3666 /* Avoid double printing for --help --target-help. */
3672 if (ARRAY_SIZE (target_switches) > 1
3673 #ifdef TARGET_OPTIONS
3674 || ARRAY_SIZE (target_options) > 1
3682 printf (_("\nTarget specific options:\n"));
3684 for (i = ARRAY_SIZE (target_switches); i--;)
3686 const char *option = target_switches[i].name;
3687 const char *description = target_switches[i].description;
3689 if (option == NULL || *option == 0)
3691 else if (description == NULL)
3696 printf (_(" -m%-23s [undocumented]\n"), option);
3698 else if (*description != 0)
3699 doc += printf (" -m%-23s %s\n", option, _(description));
3702 #ifdef TARGET_OPTIONS
3703 for (i = ARRAY_SIZE (target_options); i--;)
3705 const char *option = target_options[i].prefix;
3706 const char *description = target_options[i].description;
3708 if (option == NULL || *option == 0)
3710 else if (description == NULL)
3715 printf (_(" -m%-23s [undocumented]\n"), option);
3717 else if (*description != 0)
3718 doc += printf (" -m%-23s %s\n", option, _(description));
3724 printf (_("\nThere are undocumented target specific options as well.\n"));
3726 printf (_(" They exist, but they are not documented.\n"));
3731 /* Parse a -d... command line switch. */
3734 decode_d_option (const char *arg)
3742 for (i = 0; i < (int) DFI_MAX; ++i)
3743 dump_file[i].enabled = 1;
3749 flag_print_asm_name = 1;
3752 flag_dump_rtl_in_asm = 1;
3753 flag_print_asm_name = 1;
3756 graph_dump_format = vcg;
3759 rtl_dump_and_exit = 1;
3764 case 'D': /* These are handled by the preprocessor. */
3768 setup_core_dumping();
3773 for (i = 0; i < (int) DFI_MAX; ++i)
3774 if (c == dump_file[i].debug_switch)
3776 dump_file[i].enabled = 1;
3781 warning ("unrecognized gcc debugging option: %c", c);
3786 /* Indexed by enum debug_info_type. */
3787 const char *const debug_type_names[] =
3789 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3792 /* Decode -m switches. */
3793 /* Decode the switch -mNAME. */
3796 set_target_switch (const char *name)
3799 int valid_target_option = 0;
3801 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3802 if (!strcmp (target_switches[j].name, name))
3804 if (target_switches[j].value < 0)
3805 target_flags &= ~-target_switches[j].value;
3807 target_flags |= target_switches[j].value;
3810 if (target_switches[j].value < 0)
3811 target_flags_explicit |= -target_switches[j].value;
3813 target_flags_explicit |= target_switches[j].value;
3815 valid_target_option = 1;
3818 #ifdef TARGET_OPTIONS
3819 if (!valid_target_option)
3820 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3822 int len = strlen (target_options[j].prefix);
3823 if (target_options[j].value)
3825 if (!strcmp (target_options[j].prefix, name))
3827 *target_options[j].variable = target_options[j].value;
3828 valid_target_option = 1;
3833 if (!strncmp (target_options[j].prefix, name, len))
3835 *target_options[j].variable = name + len;
3836 valid_target_option = 1;
3842 if (!valid_target_option)
3843 error ("invalid option `%s'", name);
3846 /* Print version information to FILE.
3847 Each line begins with INDENT (for the case where FILE is the
3848 assembler output file). */
3851 print_version (FILE *file, const char *indent)
3854 #define __VERSION__ "[?]"
3858 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3860 "%s%s%s version %s (%s) compiled by CC.\n"
3862 , indent, *indent != 0 ? " " : "",
3863 lang_hooks.name, version_string, TARGET_NAME,
3864 indent, __VERSION__);
3865 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3866 indent, *indent != 0 ? " " : "",
3867 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3870 /* Print an option value and return the adjusted position in the line.
3871 ??? We don't handle error returns from fprintf (disk full); presumably
3872 other code will catch a disk full though. */
3875 print_single_switch (FILE *file, int pos, int max,
3876 const char *indent, const char *sep, const char *term,
3877 const char *type, const char *name)
3879 /* The ultrix fprintf returns 0 on success, so compute the result we want
3880 here since we need it for the following test. */
3881 int len = strlen (sep) + strlen (type) + strlen (name);
3886 fprintf (file, "%s", term);
3891 fprintf (file, "%s", indent);
3892 pos = strlen (indent);
3894 fprintf (file, "%s%s%s", sep, type, name);
3899 /* Print active target switches to FILE.
3900 POS is the current cursor position and MAX is the size of a "line".
3901 Each line begins with INDENT and ends with TERM.
3902 Each switch is separated from the next by SEP. */
3905 print_switch_values (FILE *file, int pos, int max,
3906 const char *indent, const char *sep, const char *term)
3911 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3912 that it can be printed below. This helps reproducibility. */
3915 /* Print the options as passed. */
3916 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3917 _("options passed: "), "");
3919 for (p = &save_argv[1]; *p != NULL; p++)
3923 if (strcmp (*p, "-o") == 0)
3929 if (strcmp (*p, "-quiet") == 0)
3931 if (strcmp (*p, "-version") == 0)
3936 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3939 fprintf (file, "%s", term);
3941 /* Print the -f and -m options that have been enabled.
3942 We don't handle language specific options but printing argv
3945 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3946 _("options enabled: "), "");
3948 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3949 if (*f_options[j].variable == f_options[j].on_value)
3950 pos = print_single_switch (file, pos, max, indent, sep, term,
3951 "-f", f_options[j].string);
3953 /* Print target specific options. */
3955 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3956 if (target_switches[j].name[0] != '\0'
3957 && target_switches[j].value > 0
3958 && ((target_switches[j].value & target_flags)
3959 == target_switches[j].value))
3961 pos = print_single_switch (file, pos, max, indent, sep, term,
3962 "-m", target_switches[j].name);
3965 #ifdef TARGET_OPTIONS
3966 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3967 if (*target_options[j].variable != NULL)
3970 sprintf (prefix, "-m%s", target_options[j].prefix);
3971 pos = print_single_switch (file, pos, max, indent, sep, term,
3972 prefix, *target_options[j].variable);
3976 fprintf (file, "%s", term);
3979 /* Open assembly code output file. Do this even if -fsyntax-only is
3980 on, because then the driver will have provided the name of a
3981 temporary file or bit bucket for us. NAME is the file specified on
3982 the command line, possibly NULL. */
3984 init_asm_output (const char *name)
3986 if (name == NULL && asm_file_name == 0)
3987 asm_out_file = stdout;
3990 if (asm_file_name == 0)
3992 int len = strlen (dump_base_name);
3993 char *dumpname = xmalloc (len + 6);
3994 memcpy (dumpname, dump_base_name, len + 1);
3995 strip_off_ending (dumpname, len);
3996 strcat (dumpname, ".s");
3997 asm_file_name = dumpname;
3999 if (!strcmp (asm_file_name, "-"))
4000 asm_out_file = stdout;
4002 asm_out_file = fopen (asm_file_name, "w+");
4003 if (asm_out_file == 0)
4004 fatal_error ("can't open %s for writing: %m", asm_file_name);
4007 #ifdef IO_BUFFER_SIZE
4008 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
4009 _IOFBF, IO_BUFFER_SIZE);
4012 if (!flag_syntax_only)
4014 targetm.asm_out.file_start ();
4016 #ifdef ASM_COMMENT_START
4017 if (flag_verbose_asm)
4019 /* Print the list of options in effect. */
4020 print_version (asm_out_file, ASM_COMMENT_START);
4021 print_switch_values (asm_out_file, 0, MAX_LINE,
4022 ASM_COMMENT_START, " ", "\n");
4023 /* Add a blank line here so it appears in assembler output but not
4025 fprintf (asm_out_file, "\n");
4031 /* Default tree printer. Handles declarations only. */
4033 default_tree_printer (pretty_printer * pp, text_info *text)
4035 switch (*text->format_spec)
4041 tree t = va_arg (*text->args_ptr, tree);
4042 const char *n = DECL_NAME (t)
4043 ? (*lang_hooks.decl_printable_name) (t, 2)
4054 /* Initialization of the front end environment, before command line
4055 options are parsed. Signal handlers, internationalization etc.
4056 ARGV0 is main's argv[0]. */
4058 general_init (const char *argv0)
4062 p = argv0 + strlen (argv0);
4063 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4067 xmalloc_set_program_name (progname);
4071 gcc_init_libintl ();
4073 /* Initialize the diagnostics reporting machinery, so option parsing
4074 can give warnings and errors. */
4075 diagnostic_initialize (global_dc);
4076 /* Set a default printer. Language specific initializations will
4077 override it later. */
4078 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4080 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4082 signal (SIGSEGV, crash_signal);
4085 signal (SIGILL, crash_signal);
4088 signal (SIGBUS, crash_signal);
4091 signal (SIGABRT, crash_signal);
4093 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4094 signal (SIGIOT, crash_signal);
4097 signal (SIGFPE, crash_signal);
4100 /* Other host-specific signal setup. */
4101 (*host_hooks.extra_signals)();
4103 /* Initialize the garbage-collector, string pools and tree type hash
4109 /* Initialize register usage now so switches may override. */
4112 /* Register the language-independent parameters. */
4113 add_params (lang_independent_params, LAST_PARAM);
4115 /* This must be done after add_params but before argument processing. */
4116 init_ggc_heuristics();
4119 /* Process the options that have been parsed. */
4121 process_options (void)
4123 /* Allow the front end to perform consistency checks and do further
4124 initialization based on the command line options. This hook also
4125 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4126 so we can correctly initialize debug output. */
4127 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4128 input_filename = main_input_filename;
4130 #ifdef OVERRIDE_OPTIONS
4131 /* Some machines may reject certain combinations of options. */
4135 /* Set aux_base_name if not already set. */
4138 else if (main_input_filename)
4140 char *name = xstrdup (lbasename (main_input_filename));
4142 strip_off_ending (name, strlen (name));
4143 aux_base_name = name;
4146 aux_base_name = "gccaux";
4148 /* Set up the align_*_log variables, defaulting them to 1 if they
4149 were still unset. */
4150 if (align_loops <= 0) align_loops = 1;
4151 if (align_loops_max_skip > align_loops || !align_loops)
4152 align_loops_max_skip = align_loops - 1;
4153 align_loops_log = floor_log2 (align_loops * 2 - 1);
4154 if (align_jumps <= 0) align_jumps = 1;
4155 if (align_jumps_max_skip > align_jumps || !align_jumps)
4156 align_jumps_max_skip = align_jumps - 1;
4157 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4158 if (align_labels <= 0) align_labels = 1;
4159 align_labels_log = floor_log2 (align_labels * 2 - 1);
4160 if (align_labels_max_skip > align_labels || !align_labels)
4161 align_labels_max_skip = align_labels - 1;
4162 if (align_functions <= 0) align_functions = 1;
4163 align_functions_log = floor_log2 (align_functions * 2 - 1);
4165 /* Unrolling all loops implies that standard loop unrolling must also
4167 if (flag_unroll_all_loops)
4168 flag_unroll_loops = 1;
4170 if (flag_unroll_loops)
4172 flag_old_unroll_loops = 0;
4173 flag_old_unroll_all_loops = 0;
4176 if (flag_old_unroll_all_loops)
4177 flag_old_unroll_loops = 1;
4179 /* Old loop unrolling requires that strength_reduction be on also. Silently
4180 turn on strength reduction here if it isn't already on. Also, the loop
4181 unrolling code assumes that cse will be run after loop, so that must
4182 be turned on also. */
4183 if (flag_old_unroll_loops)
4185 flag_strength_reduce = 1;
4186 flag_rerun_cse_after_loop = 1;
4188 if (flag_unroll_loops || flag_peel_loops)
4189 flag_rerun_cse_after_loop = 1;
4191 if (flag_non_call_exceptions)
4192 flag_asynchronous_unwind_tables = 1;
4193 if (flag_asynchronous_unwind_tables)
4194 flag_unwind_tables = 1;
4196 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4198 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4199 flag_unit_at_a_time = 0;
4201 /* Warn about options that are not supported on this machine. */
4202 #ifndef INSN_SCHEDULING
4203 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4204 warning ("instruction scheduling not supported on this target machine");
4207 if (flag_delayed_branch)
4208 warning ("this target machine does not have delayed branches");
4211 user_label_prefix = USER_LABEL_PREFIX;
4212 if (flag_leading_underscore != -1)
4214 /* If the default prefix is more complicated than "" or "_",
4215 issue a warning and ignore this option. */
4216 if (user_label_prefix[0] == 0 ||
4217 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4219 user_label_prefix = flag_leading_underscore ? "_" : "";
4222 warning ("-f%sleading-underscore not supported on this target machine",
4223 flag_leading_underscore ? "" : "no-");
4226 /* If we are in verbose mode, write out the version and maybe all the
4227 option flags in use. */
4230 print_version (stderr, "");
4232 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4235 if (flag_syntax_only)
4237 write_symbols = NO_DEBUG;
4241 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4243 if (debug_info_level == DINFO_LEVEL_NONE)
4244 write_symbols = NO_DEBUG;
4246 /* Now we know write_symbols, set up the debug hooks based on it.
4247 By default we do nothing for debug output. */
4248 if (write_symbols == NO_DEBUG)
4249 debug_hooks = &do_nothing_debug_hooks;
4250 #if defined(DBX_DEBUGGING_INFO)
4251 else if (write_symbols == DBX_DEBUG)
4252 debug_hooks = &dbx_debug_hooks;
4254 #if defined(XCOFF_DEBUGGING_INFO)
4255 else if (write_symbols == XCOFF_DEBUG)
4256 debug_hooks = &xcoff_debug_hooks;
4258 #ifdef SDB_DEBUGGING_INFO
4259 else if (write_symbols == SDB_DEBUG)
4260 debug_hooks = &sdb_debug_hooks;
4262 #ifdef DWARF_DEBUGGING_INFO
4263 else if (write_symbols == DWARF_DEBUG)
4264 debug_hooks = &dwarf_debug_hooks;
4266 #ifdef DWARF2_DEBUGGING_INFO
4267 else if (write_symbols == DWARF2_DEBUG)
4268 debug_hooks = &dwarf2_debug_hooks;
4270 #ifdef VMS_DEBUGGING_INFO
4271 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4272 debug_hooks = &vmsdbg_debug_hooks;
4275 error ("target system does not support the \"%s\" debug format",
4276 debug_type_names[write_symbols]);
4278 /* If auxiliary info generation is desired, open the output file.
4279 This goes in the same directory as the source file--unlike
4280 all the other output files. */
4281 if (flag_gen_aux_info)
4283 aux_info_file = fopen (aux_info_file_name, "w");
4284 if (aux_info_file == 0)
4285 fatal_error ("can't open %s: %m", aux_info_file_name);
4288 if (! targetm.have_named_sections)
4290 if (flag_function_sections)
4292 warning ("-ffunction-sections not supported for this target");
4293 flag_function_sections = 0;
4295 if (flag_data_sections)
4297 warning ("-fdata-sections not supported for this target");
4298 flag_data_sections = 0;
4302 if (flag_function_sections && profile_flag)
4304 warning ("-ffunction-sections disabled; it makes profiling impossible");
4305 flag_function_sections = 0;
4308 #ifndef HAVE_prefetch
4309 if (flag_prefetch_loop_arrays)
4311 warning ("-fprefetch-loop-arrays not supported for this target");
4312 flag_prefetch_loop_arrays = 0;
4315 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4317 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4318 flag_prefetch_loop_arrays = 0;
4322 /* This combination of options isn't handled for i386 targets and doesn't
4323 make much sense anyway, so don't allow it. */
4324 if (flag_prefetch_loop_arrays && optimize_size)
4326 warning ("-fprefetch-loop-arrays is not supported with -Os");
4327 flag_prefetch_loop_arrays = 0;
4330 #ifndef OBJECT_FORMAT_ELF
4331 if (flag_function_sections && write_symbols != NO_DEBUG)
4332 warning ("-ffunction-sections may affect debugging on some targets");
4335 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4336 if (flag_signaling_nans)
4337 flag_trapping_math = 1;
4340 /* Initialize the compiler back end. */
4344 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4345 || debug_info_level == DINFO_LEVEL_VERBOSE
4346 #ifdef VMS_DEBUGGING_INFO
4347 /* Enable line number info for traceback. */
4348 || debug_info_level > DINFO_LEVEL_NONE
4350 || flag_test_coverage
4351 || warn_notreached);
4354 init_fake_stack_mems ();
4358 init_function_once ();
4359 init_varasm_once ();
4361 /* The following initialization functions need to generate rtl, so
4362 provide a dummy function context for them. */
4363 init_dummy_function_start ();
4365 if (flag_caller_saves)
4366 init_caller_save ();
4367 expand_dummy_function_end ();
4370 /* Language-dependent initialization. Returns nonzero on success. */
4372 lang_dependent_init (const char *name)
4374 if (dump_base_name == 0)
4375 dump_base_name = name ? name : "gccdump";
4377 /* Other front-end initialization. */
4378 if ((*lang_hooks.init) () == 0)
4381 init_asm_output (name);
4383 /* These create various _DECL nodes, so need to be called after the
4384 front end is initialized. */
4388 /* The following initialization functions need to generate rtl, so
4389 provide a dummy function context for them. */
4390 init_dummy_function_start ();
4392 expand_dummy_function_end ();
4394 /* If dbx symbol table desired, initialize writing it and output the
4395 predefined types. */
4396 timevar_push (TV_SYMOUT);
4398 #ifdef DWARF2_UNWIND_INFO
4399 if (dwarf2out_do_frame ())
4400 dwarf2out_frame_init ();
4403 /* Now we have the correct original filename, we can initialize
4405 (*debug_hooks->init) (name);
4407 timevar_pop (TV_SYMOUT);
4412 /* Clean up: close opened files, etc. */
4417 /* Close the dump files. */
4418 if (flag_gen_aux_info)
4420 fclose (aux_info_file);
4422 unlink (aux_info_file_name);
4425 /* Close non-debugging input and output files. Take special care to note
4426 whether fclose returns an error, since the pages might still be on the
4427 buffer chain while the file is open. */
4431 if (ferror (asm_out_file) != 0)
4432 fatal_error ("error writing to %s: %m", asm_file_name);
4433 if (fclose (asm_out_file) != 0)
4434 fatal_error ("error closing %s: %m", asm_file_name);
4437 /* Do whatever is necessary to finish printing the graphs. */
4438 if (graph_dump_format != no_graph)
4442 for (i = 0; i < (int) DFI_MAX; ++i)
4443 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4448 sprintf (seq, DUMPFILE_FORMAT, i);
4449 suffix = concat (seq, dump_file[i].extension, NULL);
4450 finish_graph_dump_file (dump_base_name, suffix);
4457 ggc_print_statistics ();
4458 stringpool_statistics ();
4459 dump_tree_statistics ();
4462 /* Free up memory for the benefit of leak detectors. */
4465 /* Language-specific end of compilation actions. */
4466 (*lang_hooks.finish) ();
4469 /* Initialize the compiler, and compile the input file. */
4473 /* Initialize timing first. The C front ends read the main file in
4474 the post_options hook, and C++ does file timings. */
4475 if (time_report || !quiet_flag || flag_detailed_statistics)
4477 timevar_start (TV_TOTAL);
4481 /* Don't do any more if an error has already occurred. */
4484 /* Set up the back-end if requested. */
4488 /* Language-dependent initialization. Returns true on success. */
4489 if (lang_dependent_init (main_input_filename))
4491 if (flag_unit_at_a_time)
4493 open_dump_file (DFI_cgraph, NULL);
4494 cgraph_dump_file = rtl_dump_file;
4495 rtl_dump_file = NULL;
4500 if (flag_unit_at_a_time)
4502 rtl_dump_file = cgraph_dump_file;
4503 cgraph_dump_file = NULL;
4504 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4511 /* Stop timing and print the times. */
4512 timevar_stop (TV_TOTAL);
4513 timevar_print (stderr);
4516 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4517 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4518 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4520 It is not safe to call this function more than once. */
4523 toplev_main (unsigned int argc, const char **argv)
4527 /* Initialization of GCC's environment, and diagnostics. */
4528 general_init (argv[0]);
4530 /* Parse the options and do minimal processing; basically just
4531 enough to default flags appropriately. */
4532 decode_options (argc, argv);
4536 /* Exit early if we can (e.g. -help). */
4537 if (!exit_after_options)
4540 if (errorcount || sorrycount)
4541 return (FATAL_EXIT_CODE);
4543 return (SUCCESS_EXIT_CODE);