1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
73 #include "langhooks.h"
74 #include "cfglayout.h"
76 #include "hosthooks.h"
80 #include "value-prof.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static void rest_of_handle_cse (tree, rtx);
128 static void rest_of_handle_cse2 (tree, rtx);
129 static void rest_of_handle_gcse (tree, rtx);
130 static void rest_of_handle_life (tree, rtx);
131 static void rest_of_handle_loop_optimize (tree, rtx);
132 static void rest_of_handle_loop2 (tree, rtx);
133 static void rest_of_handle_jump_bypass (tree, rtx);
134 static void rest_of_handle_sibling_calls (rtx);
135 static void rest_of_handle_null_pointer (tree, rtx);
136 static void rest_of_handle_addressof (tree, rtx);
137 static void rest_of_handle_cfg (tree, rtx);
138 static void rest_of_handle_branch_prob (tree, rtx);
139 static void rest_of_handle_value_profile_transformations (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx);
150 static bool rest_of_handle_old_regalloc (tree, rtx);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
282 DFI_branch_target_load,
290 /* Describes all the dump files. Should be kept in order of the
291 pass and in sync with dump_file_index above.
293 Remaining -d letters:
299 static struct dump_file_info dump_file[DFI_MAX] =
301 { "cgraph", 'U', 0, 0, 0 },
302 { "rtl", 'r', 0, 0, 0 },
303 { "sibling", 'i', 0, 0, 0 },
304 { "eh", 'h', 0, 0, 0 },
305 { "jump", 'j', 0, 0, 0 },
306 { "null", 'u', 0, 0, 0 },
307 { "cse", 's', 0, 0, 0 },
308 { "addressof", 'F', 0, 0, 0 },
309 { "gcse", 'G', 1, 0, 0 },
310 { "loop", 'L', 1, 0, 0 },
311 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "cfg", 'f', 1, 0, 0 },
313 { "bp", 'b', 1, 0, 0 },
314 { "vpt", 'V', 1, 0, 0 },
315 { "ce1", 'C', 1, 0, 0 },
316 { "tracer", 'T', 1, 0, 0 },
317 { "loop2", 'L', 1, 0, 0 },
318 { "web", 'Z', 0, 0, 0 },
319 { "cse2", 't', 1, 0, 0 },
320 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
321 { "combine", 'c', 1, 0, 0 },
322 { "ce2", 'C', 1, 0, 0 },
323 { "regmove", 'N', 1, 0, 0 },
324 { "sched", 'S', 1, 0, 0 },
325 { "lreg", 'l', 1, 0, 0 },
326 { "greg", 'g', 1, 0, 0 },
327 { "postreload", 'o', 1, 0, 0 },
328 { "flow2", 'w', 1, 0, 0 },
329 { "peephole2", 'z', 1, 0, 0 },
330 { "rnreg", 'n', 1, 0, 0 },
331 { "ce3", 'E', 1, 0, 0 },
332 { "bbro", 'B', 1, 0, 0 },
333 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
334 { "sched2", 'R', 1, 0, 0 },
335 { "stack", 'k', 1, 0, 0 },
336 { "mach", 'M', 1, 0, 0 },
337 { "dbr", 'd', 0, 0, 0 },
340 static int open_dump_file (enum dump_file_index, tree);
341 static void close_dump_file (enum dump_file_index,
342 void (*) (FILE *, rtx), rtx);
344 /* Other flags saying which kinds of debugging dump have been requested. */
346 int rtl_dump_and_exit;
347 int flag_print_asm_name;
348 enum graph_dump_types graph_dump_format;
350 /* Name for output file of assembly code, specified with -o. */
352 const char *asm_file_name;
354 /* Nonzero means do optimizations. -O.
355 Particular numeric values stand for particular amounts of optimization;
356 thus, -O2 stores 2 here. However, the optimizations beyond the basic
357 ones are not controlled directly by this variable. Instead, they are
358 controlled by individual `flag_...' variables that are defaulted
359 based on this variable. */
363 /* Nonzero means optimize for size. -Os.
364 The only valid values are zero and nonzero. When optimize_size is
365 nonzero, optimize defaults to 2, but certain individual code
366 bloating optimizations are disabled. */
368 int optimize_size = 0;
370 /* The FUNCTION_DECL for the function currently being compiled,
371 or 0 if between functions. */
372 tree current_function_decl;
374 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
376 tree current_function_func_begin_label;
378 /* Nonzero if doing dwarf2 duplicate elimination. */
380 int flag_eliminate_dwarf2_dups = 0;
382 /* Nonzero if doing unused type elimination. */
384 int flag_eliminate_unused_debug_types = 1;
386 /* Nonzero means emit debugging information only for symbols which are used. */
387 int flag_debug_only_used_symbols = 0;
389 /* Nonzero if generating code to do profiling. */
391 int profile_flag = 0;
393 /* Nonzero if generating code to profile program flow graph arcs. */
395 int profile_arc_flag = 0;
397 /* Nonzero if value histograms should be measured. */
399 int flag_profile_values = 0;
401 /* Nonzero if value histograms should be used to optimize code. */
402 int flag_value_profile_transformations = 0;
404 /* Nonzero if generating info for gcov to calculate line test coverage. */
406 int flag_test_coverage = 0;
408 /* Nonzero indicates that branch taken probabilities should be calculated. */
410 int flag_branch_probabilities = 0;
412 /* Nonzero if basic blocks should be reordered. */
414 int flag_reorder_blocks = 0;
416 /* Nonzero if functions should be reordered. */
418 int flag_reorder_functions = 0;
420 /* Nonzero if registers should be renamed. */
422 int flag_rename_registers = 0;
423 int flag_cprop_registers = 0;
425 /* Nonzero for -pedantic switch: warn about anything
426 that standard spec forbids. */
430 /* Temporarily suppress certain warnings.
431 This is set while reading code from a system header file. */
433 int in_system_header = 0;
435 /* Don't print functions as they are compiled. -quiet. */
439 /* Print times taken by the various passes. -ftime-report. */
443 /* Print memory still in use at end of compilation (which may have little
444 to do with peak memory consumption). -fmem-report. */
448 /* Nonzero means to collect statistics which might be expensive
449 and to print them when we are done. */
450 int flag_detailed_statistics = 0;
452 /* A random sequence of characters, unless overridden by user. */
453 const char *flag_random_seed;
455 /* A local time stamp derived from the time of compilation. It will be
456 zero if the system cannot provide a time. It will be -1u, if the
457 user has specified a particular random seed. */
462 /* Nonzero means `char' should be signed. */
464 int flag_signed_char;
466 /* Nonzero means give an enum type only as many bytes as it needs. */
468 int flag_short_enums;
470 /* Nonzero for -fcaller-saves: allocate values in regs that need to
471 be saved across function calls, if that produces overall better code.
472 Optional now, so people can test it. */
474 int flag_caller_saves = 0;
476 /* Nonzero if structures and unions should be returned in memory.
478 This should only be defined if compatibility with another compiler or
479 with an ABI is needed, because it results in slower code. */
481 #ifndef DEFAULT_PCC_STRUCT_RETURN
482 #define DEFAULT_PCC_STRUCT_RETURN 1
485 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
487 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
489 /* Nonzero for -fforce-mem: load memory value into a register
490 before arithmetic on it. This makes better cse but slower compilation. */
492 int flag_force_mem = 0;
494 /* Nonzero for -fforce-addr: load memory address into a register before
495 reference to memory. This makes better cse but slower compilation. */
497 int flag_force_addr = 0;
499 /* Nonzero for -fdefer-pop: don't pop args after each function call;
500 instead save them up to pop many calls' args with one insns. */
502 int flag_defer_pop = 0;
504 /* Nonzero for -ffloat-store: don't allocate floats and doubles
505 in extended-precision registers. */
507 int flag_float_store = 0;
509 /* Nonzero for -fcse-follow-jumps:
510 have cse follow jumps to do a more extensive job. */
512 int flag_cse_follow_jumps;
514 /* Nonzero for -fcse-skip-blocks:
515 have cse follow a branch around a block. */
516 int flag_cse_skip_blocks;
518 /* Nonzero for -fexpensive-optimizations:
519 perform miscellaneous relatively-expensive optimizations. */
520 int flag_expensive_optimizations;
522 /* Nonzero for -fthread-jumps:
523 have jump optimize output of loop. */
525 int flag_thread_jumps;
527 /* Nonzero enables strength-reduction in loop.c. */
529 int flag_strength_reduce = 0;
531 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
532 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
533 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
536 int flag_old_unroll_loops;
538 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
539 This is generally not a win. */
541 int flag_old_unroll_all_loops;
543 /* Enables unrolling of simple loops in loop-unroll.c. */
544 int flag_unroll_loops;
546 /* Enables unrolling of all loops in loop-unroll.c. */
547 int flag_unroll_all_loops;
549 /* Nonzero enables loop peeling. */
552 /* Nonzero enables loop unswitching. */
553 int flag_unswitch_loops;
555 /* Nonzero enables prefetch optimizations for arrays in loops. */
557 int flag_prefetch_loop_arrays;
559 /* Nonzero forces all invariant computations in loops to be moved
562 int flag_move_all_movables = 0;
564 /* Nonzero forces all general induction variables in loops to be
567 int flag_reduce_all_givs = 0;
569 /* Nonzero to perform full register move optimization passes. This is the
572 int flag_regmove = 0;
574 /* Nonzero for -fwritable-strings:
575 store string constants in data segment and don't uniquize them. */
577 int flag_writable_strings = 0;
579 /* Nonzero means don't put addresses of constant functions in registers.
580 Used for compiling the Unix kernel, where strange substitutions are
581 done on the assembly output. */
583 int flag_no_function_cse = 0;
585 /* Nonzero for -fomit-frame-pointer:
586 don't make a frame pointer in simple functions that don't require one. */
588 int flag_omit_frame_pointer = 0;
590 /* Nonzero means place each function into its own section on those platforms
591 which support arbitrary section names and unlimited numbers of sections. */
593 int flag_function_sections = 0;
595 /* ... and similar for data. */
597 int flag_data_sections = 0;
599 /* Nonzero to inhibit use of define_optimization peephole opts. */
601 int flag_no_peephole = 0;
603 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
605 int flag_optimize_sibling_calls = 0;
607 /* Nonzero means the front end generally wants `errno' maintained by math
608 operations, like built-in SQRT. */
610 int flag_errno_math = 1;
612 /* Nonzero means that unsafe floating-point math optimizations are allowed
613 for the sake of speed. IEEE compliance is not guaranteed, and operations
614 are allowed to assume that their arguments and results are "normal"
615 (e.g., nonnegative for SQRT). */
617 int flag_unsafe_math_optimizations = 0;
619 /* Nonzero means that no NaNs or +-Infs are expected. */
621 int flag_finite_math_only = 0;
623 /* Zero means that floating-point math operations cannot generate a
624 (user-visible) trap. This is the case, for example, in nonstop
625 IEEE 754 arithmetic. Trapping conditions include division by zero,
626 overflow, underflow, invalid and inexact, but does not include
627 operations on signaling NaNs (see below). */
629 int flag_trapping_math = 1;
631 /* Nonzero means disable transformations that assume default floating
632 point rounding behavior. */
634 int flag_rounding_math = 0;
636 /* Nonzero means disable transformations observable by signaling NaNs.
637 This option implies that any operation on an IEEE signaling NaN can
638 generate a (user-visible) trap. */
640 int flag_signaling_nans = 0;
642 /* 0 means straightforward implementation of complex divide acceptable.
643 1 means wide ranges of inputs must work for complex divide.
644 2 means C99-like requirements for complex divide (not yet implemented). */
646 int flag_complex_divide_method = 0;
648 /* Nonzero means just do syntax checking; don't output anything. */
650 int flag_syntax_only = 0;
652 /* Nonzero means performs web construction pass. */
656 /* Nonzero means perform loop optimizer. */
658 int flag_loop_optimize;
660 /* Nonzero means perform crossjumping. */
662 int flag_crossjumping;
664 /* Nonzero means perform if conversion. */
666 int flag_if_conversion;
668 /* Nonzero means perform if conversion after reload. */
670 int flag_if_conversion2;
672 /* Nonzero means to use global dataflow analysis to eliminate
673 useless null pointer tests. */
675 int flag_delete_null_pointer_checks;
677 /* Nonzero means perform global CSE. */
681 /* Nonzero means to do the enhanced load motion during gcse, which trys
682 to hoist loads by not killing them when a store to the same location
685 int flag_gcse_lm = 1;
687 /* Nonzero means to perform store motion after gcse, which will try to
688 move stores closer to the exit block. Its not very effective without
691 int flag_gcse_sm = 1;
693 /* Nonzero if we want to perfrom redundant load after store elimination
696 int flag_gcse_las = 1;
698 /* Perform target register optimization before prologue / epilogue
701 int flag_branch_target_load_optimize = 0;
703 /* Perform target register optimization after prologue / epilogue
704 threading and jump2. */
706 int flag_branch_target_load_optimize2 = 0;
708 /* Nonzero means to rerun cse after loop optimization. This increases
709 compilation time about 20% and picks up a few more common expressions. */
711 int flag_rerun_cse_after_loop;
713 /* Nonzero means to run loop optimizations twice. */
715 int flag_rerun_loop_opt;
717 /* Nonzero for -finline-functions: ok to inline functions that look like
718 good inline candidates. */
720 int flag_inline_functions;
722 /* Nonzero for -fkeep-inline-functions: even if we make a function
723 go inline everywhere, keep its definition around for debugging
726 int flag_keep_inline_functions;
728 /* Nonzero means that functions will not be inlined. */
730 int flag_no_inline = 2;
732 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
733 not just because the tree inliner turned us off. */
735 int flag_really_no_inline = 2;
737 /* Nonzero means that we should emit static const variables
738 regardless of whether or not optimization is turned on. */
740 int flag_keep_static_consts = 1;
742 /* Nonzero means we should be saving declaration info into a .X file. */
744 int flag_gen_aux_info = 0;
746 /* Specified name of aux-info file. */
748 const char *aux_info_file_name;
750 /* Nonzero means make the text shared if supported. */
752 int flag_shared_data;
754 /* Nonzero means schedule into delayed branch slots if supported. */
756 int flag_delayed_branch;
758 /* Nonzero if we are compiling pure (sharable) code.
759 Value is 1 if we are doing "small" pic; value is 2 if we're doing
764 /* Nonzero if we are compiling position independent code for executable.
765 The value is 1 if we are doing "small" pic; value is 2 if we're doing
770 /* Nonzero if we are compiling code for a shared library, zero for
775 /* Set to the default thread-local storage (tls) model to use. */
777 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
779 /* Nonzero means generate extra code for exception handling and enable
780 exception handling. */
784 /* Nonzero means generate frame unwind info table when supported. */
786 int flag_unwind_tables = 0;
788 /* Nonzero means generate frame unwind info table exact at each insn
791 int flag_asynchronous_unwind_tables = 0;
793 /* Nonzero means don't place uninitialized global data in common storage
798 /* Nonzero means change certain warnings into errors.
799 Usually these are warnings about failure to conform to some standard. */
801 int flag_pedantic_errors = 0;
803 /* flag_schedule_insns means schedule insns within basic blocks (before
805 flag_schedule_insns_after_reload means schedule insns after
808 int flag_schedule_insns = 0;
809 int flag_schedule_insns_after_reload = 0;
811 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
812 int flag_sched2_use_superblocks = 0;
814 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
816 int flag_sched2_use_traces = 0;
818 /* The following flags have effect only for scheduling before register
821 flag_schedule_interblock means schedule insns across basic blocks.
822 flag_schedule_speculative means allow speculative motion of non-load insns.
823 flag_schedule_speculative_load means allow speculative motion of some
825 flag_schedule_speculative_load_dangerous allows speculative motion of more
828 int flag_schedule_interblock = 1;
829 int flag_schedule_speculative = 1;
830 int flag_schedule_speculative_load = 0;
831 int flag_schedule_speculative_load_dangerous = 0;
833 /* The following flags have an effect during scheduling after register
836 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
837 of stalled insns into the ready list.
839 flag_sched_stalled_insns_dep controls how many insn groups will be examined
840 for a dependency on a stalled insn that is candidate for premature removal
841 from the queue of stalled insns into the ready list (has an effect only if
842 the flag 'sched_stalled_insns' is set). */
844 int flag_sched_stalled_insns = 0;
845 int flag_sched_stalled_insns_dep = 1;
847 int flag_single_precision_constant;
849 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
850 by a cheaper branch on a count register. */
851 int flag_branch_on_count_reg = 1;
853 /* -finhibit-size-directive inhibits output of .size for ELF.
854 This is used only for compiling crtstuff.c,
855 and it may be extended to other effects
856 needed for crtstuff.c on other systems. */
857 int flag_inhibit_size_directive = 0;
859 /* -fverbose-asm causes extra commentary information to be produced in
860 the generated assembly code (to make it more readable). This option
861 is generally only of use to those who actually need to read the
862 generated assembly code (perhaps while debugging the compiler itself).
863 -fno-verbose-asm, the default, causes the extra information
864 to be omitted and is useful when comparing two assembler files. */
866 int flag_verbose_asm = 0;
868 /* -dA causes debug commentary information to be produced in
869 the generated assembly code (to make it more readable). This option
870 is generally only of use to those who actually need to read the
871 generated assembly code (perhaps while debugging the compiler itself).
872 Currently, this switch is only used by dwarfout.c; however, it is intended
873 to be a catchall for printing debug information in the assembler file. */
875 int flag_debug_asm = 0;
877 /* -dP causes the rtl to be emitted as a comment in assembly. */
879 int flag_dump_rtl_in_asm = 0;
881 /* Nonzero means put zero initialized data in the bss section. */
882 int flag_zero_initialized_in_bss = 1;
884 /* Tag all structures with __attribute__(packed). */
885 int flag_pack_struct = 0;
887 /* Emit code to check for stack overflow; also may cause large objects
888 to be allocated dynamically. */
889 int flag_stack_check;
891 /* When non-NULL, indicates that whenever space is allocated on the
892 stack, the resulting stack pointer must not pass this
893 address---that is, for stacks that grow downward, the stack pointer
894 must always be greater than or equal to this address; for stacks
895 that grow upward, the stack pointer must be less than this address.
896 At present, the rtx may be either a REG or a SYMBOL_REF, although
897 the support provided depends on the backend. */
900 /* 0 if pointer arguments may alias each other. True in C.
901 1 if pointer arguments may not alias each other but may alias
903 2 if pointer arguments may not alias each other and may not
904 alias global variables. True in Fortran.
905 This defaults to 0 for C. */
906 int flag_argument_noalias = 0;
908 /* Nonzero if we should do (language-dependent) alias analysis.
909 Typically, this analysis will assume that expressions of certain
910 types do not alias expressions of certain other types. Only used
911 if alias analysis (in general) is enabled. */
912 int flag_strict_aliasing = 0;
914 /* Instrument functions with calls at entry and exit, for profiling. */
915 int flag_instrument_function_entry_exit = 0;
917 /* Nonzero means ignore `#ident' directives. 0 means handle them.
918 On SVR4 targets, it also controls whether or not to emit a
919 string identifying the compiler. */
921 int flag_no_ident = 0;
923 /* This will perform a peephole pass before sched2. */
924 int flag_peephole2 = 0;
926 /* This will try to guess branch probabilities. */
927 int flag_guess_branch_prob = 0;
929 /* -fcheck-bounds causes gcc to generate array bounds checks.
930 For C, C++, ObjC: defaults to off.
931 For Java: defaults to on.
932 For Fortran: defaults to off. */
933 int flag_bounds_check = 0;
935 /* This will attempt to merge constant section constants, if 1 only
936 string constants and constants from constant pool, if 2 also constant
938 int flag_merge_constants = 1;
940 /* If one, renumber instruction UIDs to reduce the number of
941 unused UIDs if there are a lot of instructions. If greater than
942 one, unconditionally renumber instruction UIDs. */
943 int flag_renumber_insns = 1;
945 /* If nonzero, use the graph coloring register allocator. */
946 int flag_new_regalloc = 0;
948 /* Nonzero if we perform superblock formation. */
952 /* Nonzero if we perform whole unit at a time compilation. */
954 int flag_unit_at_a_time = 0;
956 /* Values of the -falign-* flags: how much to align labels in code.
957 0 means `use default', 1 means `don't align'.
958 For each variable, there is an _log variant which is the power
959 of two not less than the variable, for .align output. */
963 int align_loops_max_skip;
966 int align_jumps_max_skip;
968 int align_labels_log;
969 int align_labels_max_skip;
971 int align_functions_log;
973 /* Like align_functions_log above, but used by front-ends to force the
974 minimum function alignment. Zero means no alignment is forced. */
975 int force_align_functions_log;
979 const char *const string;
983 lang_independent_options;
985 /* Nonzero if signed arithmetic overflow should trap. */
988 /* Nonzero if signed arithmetic overflow should wrap around. */
991 /* Nonzero if subexpressions must be evaluated from left-to-right. */
992 int flag_evaluation_order = 0;
994 /* Add or remove a leading underscore from user symbols. */
995 int flag_leading_underscore = -1;
997 /* The user symbol prefix after having resolved same. */
998 const char *user_label_prefix;
1000 static const param_info lang_independent_params[] = {
1001 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1002 { OPTION, DEFAULT, HELP },
1003 #include "params.def"
1008 /* Table of language-independent -f options.
1009 STRING is the option name. VARIABLE is the address of the variable.
1010 ON_VALUE is the value to store in VARIABLE
1011 if `-fSTRING' is seen as an option.
1012 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1014 static const lang_independent_options f_options[] =
1016 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1017 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1018 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1019 {"float-store", &flag_float_store, 1 },
1020 {"defer-pop", &flag_defer_pop, 1 },
1021 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1022 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1023 {"tracer", &flag_tracer, 1 },
1024 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1025 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1026 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1027 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1028 {"thread-jumps", &flag_thread_jumps, 1 },
1029 {"strength-reduce", &flag_strength_reduce, 1 },
1030 {"unroll-loops", &flag_unroll_loops, 1 },
1031 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1032 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1033 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1034 {"peel-loops", &flag_peel_loops, 1 },
1035 {"unswitch-loops", &flag_unswitch_loops, 1 },
1036 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1037 {"move-all-movables", &flag_move_all_movables, 1 },
1038 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1039 {"writable-strings", &flag_writable_strings, 1 },
1040 {"peephole", &flag_no_peephole, 0 },
1041 {"force-mem", &flag_force_mem, 1 },
1042 {"force-addr", &flag_force_addr, 1 },
1043 {"function-cse", &flag_no_function_cse, 0 },
1044 {"inline-functions", &flag_inline_functions, 1 },
1045 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1046 {"inline", &flag_no_inline, 0 },
1047 {"keep-static-consts", &flag_keep_static_consts, 1 },
1048 {"syntax-only", &flag_syntax_only, 1 },
1049 {"shared-data", &flag_shared_data, 1 },
1050 {"caller-saves", &flag_caller_saves, 1 },
1051 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1052 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1053 {"delayed-branch", &flag_delayed_branch, 1 },
1054 {"web", &flag_web, 1},
1055 {"gcse", &flag_gcse, 1 },
1056 {"gcse-lm", &flag_gcse_lm, 1 },
1057 {"gcse-sm", &flag_gcse_sm, 1 },
1058 {"gcse-las", &flag_gcse_las, 1 },
1059 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1060 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1061 {"loop-optimize", &flag_loop_optimize, 1 },
1062 {"crossjumping", &flag_crossjumping, 1 },
1063 {"if-conversion", &flag_if_conversion, 1 },
1064 {"if-conversion2", &flag_if_conversion2, 1 },
1065 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1066 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1067 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1068 {"schedule-insns", &flag_schedule_insns, 1 },
1069 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1070 {"sched-interblock",&flag_schedule_interblock, 1 },
1071 {"sched-spec",&flag_schedule_speculative, 1 },
1072 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1073 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1074 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1075 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1076 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1077 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1078 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1079 {"pic", &flag_pic, 1 },
1080 {"PIC", &flag_pic, 2 },
1081 {"pie", &flag_pie, 1 },
1082 {"PIE", &flag_pie, 2 },
1083 {"exceptions", &flag_exceptions, 1 },
1084 {"unwind-tables", &flag_unwind_tables, 1 },
1085 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1086 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1087 {"profile-arcs", &profile_arc_flag, 1 },
1088 {"profile-values", &flag_profile_values, 1 },
1089 {"vpt", &flag_value_profile_transformations, 1 },
1090 {"test-coverage", &flag_test_coverage, 1 },
1091 {"branch-probabilities", &flag_branch_probabilities, 1 },
1092 {"profile", &profile_flag, 1 },
1093 {"reorder-blocks", &flag_reorder_blocks, 1 },
1094 {"reorder-functions", &flag_reorder_functions, 1 },
1095 {"rename-registers", &flag_rename_registers, 1 },
1096 {"cprop-registers", &flag_cprop_registers, 1 },
1097 {"common", &flag_no_common, 0 },
1098 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1099 {"function-sections", &flag_function_sections, 1 },
1100 {"data-sections", &flag_data_sections, 1 },
1101 {"verbose-asm", &flag_verbose_asm, 1 },
1102 {"regmove", &flag_regmove, 1 },
1103 {"optimize-register-move", &flag_regmove, 1 },
1104 {"pack-struct", &flag_pack_struct, 1 },
1105 {"stack-check", &flag_stack_check, 1 },
1106 {"argument-alias", &flag_argument_noalias, 0 },
1107 {"argument-noalias", &flag_argument_noalias, 1 },
1108 {"argument-noalias-global", &flag_argument_noalias, 2 },
1109 {"strict-aliasing", &flag_strict_aliasing, 1 },
1110 {"align-loops", &align_loops, 0 },
1111 {"align-jumps", &align_jumps, 0 },
1112 {"align-labels", &align_labels, 0 },
1113 {"align-functions", &align_functions, 0 },
1114 {"merge-constants", &flag_merge_constants, 1 },
1115 {"merge-all-constants", &flag_merge_constants, 2 },
1116 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1117 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1118 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1119 {"leading-underscore", &flag_leading_underscore, 1 },
1120 {"ident", &flag_no_ident, 0 },
1121 { "peephole2", &flag_peephole2, 1 },
1122 {"finite-math-only", &flag_finite_math_only, 1 },
1123 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1124 {"math-errno", &flag_errno_math, 1 },
1125 {"trapping-math", &flag_trapping_math, 1 },
1126 {"rounding-math", &flag_rounding_math, 1 },
1127 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1128 {"signaling-nans", &flag_signaling_nans, 1 },
1129 {"bounds-check", &flag_bounds_check, 1 },
1130 {"single-precision-constant", &flag_single_precision_constant, 1 },
1131 {"time-report", &time_report, 1 },
1132 {"mem-report", &mem_report, 1 },
1133 { "trapv", &flag_trapv, 1 },
1134 { "wrapv", &flag_wrapv, 1 },
1135 { "new-ra", &flag_new_regalloc, 1 }
1138 /* Here is a table, controlled by the tm.h file, listing each -m switch
1139 and which bits in `target_switches' it should set or clear.
1140 If VALUE is positive, it is bits to set.
1141 If VALUE is negative, -VALUE is bits to clear.
1142 (The sign bit is not used so there is no confusion.) */
1146 const char *const name;
1148 const char *const description;
1150 target_switches[] = TARGET_SWITCHES;
1152 /* This table is similar, but allows the switch to have a value. */
1154 #ifdef TARGET_OPTIONS
1157 const char *const prefix;
1158 const char **const variable;
1159 const char *const description;
1160 const char *const value;
1162 target_options[] = TARGET_OPTIONS;
1165 /* Nonzero means warn about function definitions that default the return type
1166 or that use a null return and have a return-type other than void. */
1168 int warn_return_type;
1170 /* Output files for assembler code (real compiler output)
1171 and debugging dumps. */
1174 FILE *aux_info_file;
1175 FILE *rtl_dump_file = NULL;
1176 FILE *cgraph_dump_file = NULL;
1178 /* The current working directory of a translation. It's generally the
1179 directory from which compilation was initiated, but a preprocessed
1180 file may specify the original directory in which it was
1183 static const char *src_pwd;
1185 /* Initialize src_pwd with the given string, and return true. If it
1186 was already initialized, return false. As a special case, it may
1187 be called with a NULL argument to test whether src_pwd has NOT been
1191 set_src_pwd (const char *pwd)
1196 src_pwd = xstrdup (pwd);
1200 /* Return the directory from which the translation unit was initiated,
1201 in case set_src_pwd() was not called before to assign it a
1208 src_pwd = getpwd ();
1213 /* Called when the start of a function definition is parsed,
1214 this function prints on stderr the name of the function. */
1216 announce_function (tree decl)
1220 if (rtl_dump_and_exit)
1221 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1223 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1225 pp_needs_newline (global_dc->printer) = true;
1226 diagnostic_set_last_function (global_dc);
1230 /* Set up a default flag_random_seed and local_tick, unless the user
1231 already specified one. */
1236 if (!flag_random_seed)
1238 unsigned HOST_WIDE_INT value;
1239 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1241 /* Get some more or less random data. */
1242 #ifdef HAVE_GETTIMEOFDAY
1246 gettimeofday (&tv, NULL);
1247 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1251 time_t now = time (NULL);
1253 if (now != (time_t)-1)
1254 local_tick = (unsigned) now;
1257 value = local_tick ^ getpid ();
1259 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1260 flag_random_seed = random_seed;
1262 else if (!local_tick)
1267 /* Decode the string P as an integral parameter.
1268 If the string is indeed an integer return its numeric value else
1269 issue an Invalid Option error for the option PNAME and return DEFVAL.
1270 If PNAME is zero just return DEFVAL, do not call error. */
1273 read_integral_parameter (const char *p, const char *pname, const int defval)
1275 const char *endp = p;
1279 if (ISDIGIT (*endp))
1288 error ("invalid option argument `%s'", pname);
1295 /* Return the logarithm of X, base 2, considering X unsigned,
1296 if X is a power of 2. Otherwise, returns -1.
1298 This should be used via the `exact_log2' macro. */
1301 exact_log2_wide (unsigned HOST_WIDE_INT x)
1304 /* Test for 0 or a power of 2. */
1305 if (x == 0 || x != (x & -x))
1307 while ((x >>= 1) != 0)
1312 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1313 If X is 0, return -1.
1315 This should be used via the floor_log2 macro. */
1318 floor_log2_wide (unsigned HOST_WIDE_INT x)
1327 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1328 into ICE messages, which is much more user friendly. In case the
1329 error printer crashes, reset the signal to prevent infinite recursion. */
1332 crash_signal (int signo)
1334 signal (signo, SIG_DFL);
1335 internal_error ("%s", strsignal (signo));
1338 /* Arrange to dump core on error. (The regular error message is still
1339 printed first, except in the case of abort().) */
1342 setup_core_dumping (void)
1345 signal (SIGABRT, SIG_DFL);
1347 #if defined(HAVE_SETRLIMIT)
1350 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1351 fatal_error ("getting core file size maximum limit: %m");
1352 rlim.rlim_cur = rlim.rlim_max;
1353 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1354 fatal_error ("setting core file size limit to maximum: %m");
1357 diagnostic_abort_on_error (global_dc);
1361 /* Strip off a legitimate source ending from the input string NAME of
1362 length LEN. Rather than having to know the names used by all of
1363 our front ends, we strip off an ending of a period followed by
1364 up to five characters. (Java uses ".class".) */
1367 strip_off_ending (char *name, int len)
1370 for (i = 2; i < 6 && len > i; i++)
1372 if (name[len - i] == '.')
1374 name[len - i] = '\0';
1380 /* Output a quoted string. */
1383 output_quoted_string (FILE *asm_file, const char *string)
1385 #ifdef OUTPUT_QUOTED_STRING
1386 OUTPUT_QUOTED_STRING (asm_file, string);
1390 putc ('\"', asm_file);
1391 while ((c = *string++) != 0)
1395 if (c == '\"' || c == '\\')
1396 putc ('\\', asm_file);
1400 fprintf (asm_file, "\\%03o", (unsigned char) c);
1402 putc ('\"', asm_file);
1406 /* Output a file name in the form wanted by System V. */
1409 output_file_directive (FILE *asm_file, const char *input_name)
1414 if (input_name == NULL)
1415 input_name = "<stdin>";
1417 len = strlen (input_name);
1418 na = input_name + len;
1420 /* NA gets INPUT_NAME sans directory names. */
1421 while (na > input_name)
1423 if (IS_DIR_SEPARATOR (na[-1]))
1428 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1429 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1431 fprintf (asm_file, "\t.file\t");
1432 output_quoted_string (asm_file, na);
1433 fputc ('\n', asm_file);
1437 /* Routine to open a dump file. Return true if the dump file is enabled. */
1440 open_dump_file (enum dump_file_index index, tree decl)
1443 const char *open_arg;
1446 if (! dump_file[index].enabled)
1449 timevar_push (TV_DUMP);
1450 if (rtl_dump_file != NULL)
1451 fclose (rtl_dump_file);
1453 sprintf (seq, DUMPFILE_FORMAT, index);
1455 if (! dump_file[index].initialized)
1457 /* If we've not initialized the files, do so now. */
1458 if (graph_dump_format != no_graph
1459 && dump_file[index].graph_dump_p)
1461 dump_name = concat (seq, dump_file[index].extension, NULL);
1462 clean_graph_dump_file (dump_base_name, dump_name);
1465 dump_file[index].initialized = 1;
1471 dump_name = concat (dump_base_name, seq,
1472 dump_file[index].extension, NULL);
1474 rtl_dump_file = fopen (dump_name, open_arg);
1475 if (rtl_dump_file == NULL)
1476 fatal_error ("can't open %s: %m", dump_name);
1481 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1482 (*lang_hooks.decl_printable_name) (decl, 2),
1483 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1485 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1486 ? " (unlikely executed)"
1489 timevar_pop (TV_DUMP);
1493 /* Routine to close a dump file. */
1496 close_dump_file (enum dump_file_index index,
1497 void (*func) (FILE *, rtx),
1500 if (! rtl_dump_file)
1503 timevar_push (TV_DUMP);
1505 && graph_dump_format != no_graph
1506 && dump_file[index].graph_dump_p)
1511 sprintf (seq, DUMPFILE_FORMAT, index);
1512 suffix = concat (seq, dump_file[index].extension, NULL);
1513 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1518 func (rtl_dump_file, insns);
1520 fflush (rtl_dump_file);
1521 fclose (rtl_dump_file);
1523 rtl_dump_file = NULL;
1524 timevar_pop (TV_DUMP);
1527 /* Do any final processing required for the declarations in VEC, of
1528 which there are LEN. We write out inline functions and variables
1529 that have been deferred until this point, but which are required.
1530 Returns nonzero if anything was put out. */
1533 wrapup_global_declarations (tree *vec, int len)
1538 int output_something = 0;
1540 for (i = 0; i < len; i++)
1544 /* We're not deferring this any longer. Assignment is
1545 conditional to avoid needlessly dirtying PCH pages. */
1546 if (DECL_DEFER_OUTPUT (decl) != 0)
1547 DECL_DEFER_OUTPUT (decl) = 0;
1549 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1550 (*lang_hooks.finish_incomplete_decl) (decl);
1553 /* Now emit any global variables or functions that we have been
1554 putting off. We need to loop in case one of the things emitted
1555 here references another one which comes earlier in the list. */
1559 for (i = 0; i < len; i++)
1563 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1566 /* Don't write out static consts, unless we still need them.
1568 We also keep static consts if not optimizing (for debugging),
1569 unless the user specified -fno-keep-static-consts.
1570 ??? They might be better written into the debug information.
1571 This is possible when using DWARF.
1573 A language processor that wants static constants to be always
1574 written out (even if it is not used) is responsible for
1575 calling rest_of_decl_compilation itself. E.g. the C front-end
1576 calls rest_of_decl_compilation from finish_decl.
1577 One motivation for this is that is conventional in some
1578 environments to write things like:
1579 static const char rcsid[] = "... version string ...";
1580 intending to force the string to be in the executable.
1582 A language processor that would prefer to have unneeded
1583 static constants "optimized away" would just defer writing
1584 them out until here. E.g. C++ does this, because static
1585 constants are often defined in header files.
1587 ??? A tempting alternative (for both C and C++) would be
1588 to force a constant to be written if and only if it is
1589 defined in a main file, as opposed to an include file. */
1591 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1595 if (flag_unit_at_a_time
1596 && cgraph_varpool_node (decl)->finalized)
1598 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1599 && (TREE_USED (decl)
1600 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1602 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1604 else if (DECL_COMDAT (decl))
1606 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1607 && (optimize || !flag_keep_static_consts
1608 || DECL_ARTIFICIAL (decl)))
1614 rest_of_decl_compilation (decl, NULL, 1, 1);
1618 if (TREE_CODE (decl) == FUNCTION_DECL
1619 && DECL_INITIAL (decl) != 0
1620 && DECL_SAVED_INSNS (decl) != 0
1621 && DECL_SAVED_INSNS (decl)->saved_for_inline
1622 && (flag_keep_inline_functions
1623 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1624 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1627 output_inline_function (decl);
1632 output_something = 1;
1636 return output_something;
1639 /* Issue appropriate warnings for the global declarations in VEC (of
1640 which there are LEN). Output debugging information for them. */
1643 check_global_declarations (tree *vec, int len)
1648 for (i = 0; i < len; i++)
1652 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1653 && ! TREE_ASM_WRITTEN (decl))
1654 /* Cancel the RTL for this decl so that, if debugging info
1655 output for global variables is still to come,
1656 this one will be omitted. */
1657 SET_DECL_RTL (decl, NULL_RTX);
1659 /* Warn about any function
1660 declared static but not defined.
1661 We don't warn about variables,
1662 because many programs have static variables
1663 that exist only to get some text into the object file. */
1664 if (TREE_CODE (decl) == FUNCTION_DECL
1665 && (warn_unused_function
1666 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1667 && DECL_INITIAL (decl) == 0
1668 && DECL_EXTERNAL (decl)
1669 && ! DECL_ARTIFICIAL (decl)
1670 && ! TREE_PUBLIC (decl))
1672 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1673 pedwarn ("%J'%F' used but never defined", decl, decl);
1675 warning ("%J'%F' declared `static' but never defined", decl, decl);
1676 /* This symbol is effectively an "extern" declaration now. */
1677 TREE_PUBLIC (decl) = 1;
1678 assemble_external (decl);
1681 /* Warn about static fns or vars defined but not used. */
1682 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1683 /* We don't warn about "static const" variables because the
1684 "rcs_id" idiom uses that construction. */
1685 || (warn_unused_variable
1686 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1687 && ! DECL_IN_SYSTEM_HEADER (decl)
1688 && ! TREE_USED (decl)
1689 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1690 to handle multiple external decls in different scopes. */
1691 && ! TREE_USED (DECL_NAME (decl))
1692 && ! DECL_EXTERNAL (decl)
1693 && ! TREE_PUBLIC (decl)
1694 /* A volatile variable might be used in some non-obvious way. */
1695 && ! TREE_THIS_VOLATILE (decl)
1696 /* Global register variables must be declared to reserve them. */
1697 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1698 /* Otherwise, ask the language. */
1699 && (*lang_hooks.decls.warn_unused_global) (decl))
1700 warning ("%J'%D' defined but not used", decl, decl);
1702 /* Avoid confusing the debug information machinery when there are
1704 if (errorcount == 0 && sorrycount == 0)
1706 timevar_push (TV_SYMOUT);
1707 (*debug_hooks->global_decl) (decl);
1708 timevar_pop (TV_SYMOUT);
1713 /* Warn about a use of an identifier which was marked deprecated. */
1715 warn_deprecated_use (tree node)
1717 if (node == 0 || !warn_deprecated_decl)
1721 warning ("`%s' is deprecated (declared at %s:%d)",
1722 IDENTIFIER_POINTER (DECL_NAME (node)),
1723 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1724 else if (TYPE_P (node))
1726 const char *what = NULL;
1727 tree decl = TYPE_STUB_DECL (node);
1729 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1730 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1731 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1732 && DECL_NAME (TYPE_NAME (node)))
1733 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1738 warning ("`%s' is deprecated (declared at %s:%d)", what,
1739 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1741 warning ("`%s' is deprecated", what);
1744 warning ("type is deprecated (declared at %s:%d)",
1745 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1747 warning ("type is deprecated");
1751 /* Save the current INPUT_LOCATION on the top entry in the
1752 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1753 INPUT_LOCATION accordingly. */
1756 push_srcloc (const char *file, int line)
1758 struct file_stack *fs;
1760 fs = xmalloc (sizeof (struct file_stack));
1761 fs->location = input_location;
1762 fs->next = input_file_stack;
1763 input_filename = file;
1765 input_file_stack = fs;
1766 input_file_stack_tick++;
1769 /* Pop the top entry off the stack of presently open source files.
1770 Restore the INPUT_LOCATION from the new topmost entry on the
1776 struct file_stack *fs;
1778 fs = input_file_stack;
1779 input_location = fs->location;
1780 input_file_stack = fs->next;
1782 input_file_stack_tick++;
1785 /* Compile an entire translation unit. Write a file of assembly
1786 output and various debugging dumps. */
1791 /* Initialize yet another pass. */
1793 init_final (main_input_filename);
1794 coverage_init (aux_base_name);
1796 timevar_push (TV_PARSE);
1798 /* Call the parser, which parses the entire file (calling
1799 rest_of_compilation for each function). */
1800 (*lang_hooks.parse_file) (set_yydebug);
1802 /* In case there were missing block closers,
1803 get us back to the global binding level. */
1804 (*lang_hooks.clear_binding_stack) ();
1806 /* Compilation is now finished except for writing
1807 what's left of the symbol table output. */
1808 timevar_pop (TV_PARSE);
1810 if (flag_syntax_only)
1813 (*lang_hooks.decls.final_write_globals)();
1815 cgraph_varpool_assemble_pending_decls ();
1817 /* This must occur after the loop to output deferred functions.
1818 Else the coverage initializer would not be emitted if all the
1819 functions in this compilation unit were deferred. */
1822 /* Write out any pending weak symbol declarations. */
1826 /* Do dbx symbols. */
1827 timevar_push (TV_SYMOUT);
1829 #ifdef DWARF2_UNWIND_INFO
1830 if (dwarf2out_do_frame ())
1831 dwarf2out_frame_finish ();
1834 (*debug_hooks->finish) (main_input_filename);
1835 timevar_pop (TV_SYMOUT);
1837 /* Output some stuff at end of file if nec. */
1839 dw2_output_indirect_constants ();
1841 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1843 timevar_push (TV_DUMP);
1844 open_dump_file (DFI_bp, NULL);
1848 close_dump_file (DFI_bp, NULL, NULL_RTX);
1849 timevar_pop (TV_DUMP);
1852 targetm.asm_out.file_end ();
1854 /* Attach a special .ident directive to the end of the file to identify
1855 the version of GCC which compiled this code. The format of the .ident
1856 string is patterned after the ones produced by native SVR4 compilers. */
1859 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1860 IDENT_ASM_OP, version_string);
1863 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1865 timevar_push (TV_DUMP);
1866 dump_combine_total_stats (rtl_dump_file);
1867 close_dump_file (DFI_combine, NULL, NULL_RTX);
1868 timevar_pop (TV_DUMP);
1872 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1873 and TYPE_DECL nodes.
1875 This does nothing for local (non-static) variables, unless the
1876 variable is a register variable with an ASMSPEC. In that case, or
1877 if the variable is not an automatic, it sets up the RTL and
1878 outputs any assembler code (label definition, storage allocation
1879 and initialization).
1881 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1882 the assembler symbol name to be used. TOP_LEVEL is nonzero
1883 if this declaration is not within a function. */
1886 rest_of_decl_compilation (tree decl,
1887 const char *asmspec,
1891 /* We deferred calling assemble_alias so that we could collect
1892 other attributes such as visibility. Emit the alias now. */
1895 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1898 alias = TREE_VALUE (TREE_VALUE (alias));
1899 alias = get_identifier (TREE_STRING_POINTER (alias));
1900 assemble_alias (decl, alias);
1904 /* Forward declarations for nested functions are not "external",
1905 but we need to treat them as if they were. */
1906 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1907 || TREE_CODE (decl) == FUNCTION_DECL)
1909 timevar_push (TV_VARCONST);
1912 make_decl_rtl (decl, asmspec);
1914 /* Don't output anything when a tentative file-scope definition
1915 is seen. But at end of compilation, do output code for them.
1917 We do output all variables when unit-at-a-time is active and rely on
1918 callgraph code to defer them except for forward declarations
1919 (see gcc.c-torture/compile/920624-1.c) */
1921 || !DECL_DEFER_OUTPUT (decl)
1922 || (flag_unit_at_a_time && DECL_INITIAL (decl)))
1923 && !DECL_EXTERNAL (decl))
1925 if (flag_unit_at_a_time && !cgraph_global_info_ready
1926 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1927 cgraph_varpool_finalize_decl (decl);
1929 assemble_variable (decl, top_level, at_end, 0);
1932 #ifdef ASM_FINISH_DECLARE_OBJECT
1933 if (decl == last_assemble_variable_decl)
1935 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1940 timevar_pop (TV_VARCONST);
1942 else if (DECL_REGISTER (decl) && asmspec != 0)
1944 if (decode_reg_name (asmspec) >= 0)
1946 SET_DECL_RTL (decl, NULL_RTX);
1947 make_decl_rtl (decl, asmspec);
1951 error ("invalid register name `%s' for register variable", asmspec);
1952 DECL_REGISTER (decl) = 0;
1957 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1958 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1959 && TREE_CODE (decl) == TYPE_DECL)
1961 timevar_push (TV_SYMOUT);
1962 dbxout_symbol (decl, 0);
1963 timevar_pop (TV_SYMOUT);
1966 #ifdef SDB_DEBUGGING_INFO
1967 else if (write_symbols == SDB_DEBUG && top_level
1968 && TREE_CODE (decl) == TYPE_DECL)
1970 timevar_push (TV_SYMOUT);
1971 sdbout_symbol (decl, 0);
1972 timevar_pop (TV_SYMOUT);
1975 #ifdef DWARF2_DEBUGGING_INFO
1976 else if ((write_symbols == DWARF2_DEBUG
1977 || write_symbols == VMS_AND_DWARF2_DEBUG)
1979 && TREE_CODE (decl) == TYPE_DECL)
1981 timevar_push (TV_SYMOUT);
1982 dwarf2out_decl (decl);
1983 timevar_pop (TV_SYMOUT);
1988 /* Called after finishing a record, union or enumeral type. */
1991 rest_of_type_compilation (
1992 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1993 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1997 tree type ATTRIBUTE_UNUSED,
1998 int toplev ATTRIBUTE_UNUSED
2002 /* Avoid confusing the debug information machinery when there are
2004 if (errorcount != 0 || sorrycount != 0)
2007 timevar_push (TV_SYMOUT);
2008 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2009 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2010 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2012 #ifdef SDB_DEBUGGING_INFO
2013 if (write_symbols == SDB_DEBUG)
2014 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2016 #ifdef DWARF2_DEBUGGING_INFO
2017 if ((write_symbols == DWARF2_DEBUG
2018 || write_symbols == VMS_AND_DWARF2_DEBUG)
2020 dwarf2out_decl (TYPE_STUB_DECL (type));
2022 timevar_pop (TV_SYMOUT);
2025 /* Turn the RTL into assembly. */
2027 rest_of_handle_final (tree decl, rtx insns)
2029 timevar_push (TV_FINAL);
2034 /* Get the function's name, as described by its RTL. This may be
2035 different from the DECL_NAME name used in the source file. */
2037 x = DECL_RTL (decl);
2038 if (GET_CODE (x) != MEM)
2041 if (GET_CODE (x) != SYMBOL_REF)
2043 fnname = XSTR (x, 0);
2045 assemble_start_function (decl, fnname);
2046 final_start_function (insns, asm_out_file, optimize);
2047 final (insns, asm_out_file, optimize, 0);
2048 final_end_function ();
2050 #ifdef IA64_UNWIND_INFO
2051 /* ??? The IA-64 ".handlerdata" directive must be issued before
2052 the ".endp" directive that closes the procedure descriptor. */
2053 output_function_exception_table ();
2056 assemble_end_function (decl, fnname);
2058 #ifndef IA64_UNWIND_INFO
2059 /* Otherwise, it feels unclean to switch sections in the middle. */
2060 output_function_exception_table ();
2064 fflush (asm_out_file);
2066 /* Release all memory allocated by flow. */
2067 free_basic_block_vars (0);
2069 /* Release all memory held by regsets now. */
2070 regset_release_memory ();
2072 timevar_pop (TV_FINAL);
2078 /* Run delay slot optimization. */
2080 rest_of_handle_delay_slots (tree decl, rtx insns)
2082 timevar_push (TV_DBR_SCHED);
2083 open_dump_file (DFI_dbr, decl);
2085 dbr_schedule (insns, rtl_dump_file);
2087 close_dump_file (DFI_dbr, print_rtl, insns);
2088 timevar_pop (TV_DBR_SCHED);
2095 /* Convert register usage from flat register file usage to a stack
2098 rest_of_handle_stack_regs (tree decl, rtx insns)
2100 #if defined (HAVE_ATTR_length)
2101 /* If flow2 creates new instructions which need splitting
2102 and scheduling after reload is not done, they might not be
2103 split until final which doesn't allow splitting
2104 if HAVE_ATTR_length. */
2105 #ifdef INSN_SCHEDULING
2106 if (optimize && !flag_schedule_insns_after_reload)
2111 timevar_push (TV_SHORTEN_BRANCH);
2112 split_all_insns (1);
2113 timevar_pop (TV_SHORTEN_BRANCH);
2117 timevar_push (TV_REG_STACK);
2118 open_dump_file (DFI_stack, decl);
2120 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2122 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2123 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2124 && flag_reorder_blocks)
2126 reorder_basic_blocks ();
2127 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2131 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2132 timevar_pop (TV_REG_STACK);
2139 /* Machine independent reorg pass. */
2141 rest_of_handle_machine_reorg (tree decl, rtx insns)
2143 timevar_push (TV_MACH_DEP);
2144 open_dump_file (DFI_mach, decl);
2146 (*targetm.machine_dependent_reorg) ();
2148 close_dump_file (DFI_mach, print_rtl, insns);
2149 timevar_pop (TV_MACH_DEP);
2155 /* Run new register allocator. Return TRUE if we must exit
2156 rest_of_compilation upon return. */
2158 rest_of_handle_new_regalloc (tree decl, rtx insns)
2162 delete_trivially_dead_insns (insns, max_reg_num ());
2165 timevar_pop (TV_LOCAL_ALLOC);
2166 if (dump_file[DFI_lreg].enabled)
2168 timevar_push (TV_DUMP);
2170 close_dump_file (DFI_lreg, NULL, NULL);
2171 timevar_pop (TV_DUMP);
2174 /* XXX clean up the whole mess to bring live info in shape again. */
2175 timevar_push (TV_GLOBAL_ALLOC);
2176 open_dump_file (DFI_greg, decl);
2178 build_insn_chain (insns);
2179 failure = reload (insns, 0);
2181 timevar_pop (TV_GLOBAL_ALLOC);
2183 if (dump_file[DFI_greg].enabled)
2185 timevar_push (TV_DUMP);
2187 dump_global_regs (rtl_dump_file);
2189 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2190 timevar_pop (TV_DUMP);
2196 reload_completed = 1;
2201 /* Run old register allocator. Return TRUE if we must exit
2202 rest_of_compilation upon return. */
2204 rest_of_handle_old_regalloc (tree decl, rtx insns)
2209 /* Allocate the reg_renumber array. */
2210 allocate_reg_info (max_regno, FALSE, TRUE);
2212 /* And the reg_equiv_memory_loc array. */
2213 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2215 allocate_initial_values (reg_equiv_memory_loc);
2217 regclass (insns, max_reg_num (), rtl_dump_file);
2218 rebuild_notes = local_alloc ();
2220 timevar_pop (TV_LOCAL_ALLOC);
2222 /* Local allocation may have turned an indirect jump into a direct
2223 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2227 timevar_push (TV_JUMP);
2229 rebuild_jump_labels (insns);
2230 purge_all_dead_edges (0);
2232 timevar_pop (TV_JUMP);
2235 if (dump_file[DFI_lreg].enabled)
2237 timevar_push (TV_DUMP);
2239 dump_flow_info (rtl_dump_file);
2240 dump_local_alloc (rtl_dump_file);
2242 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2243 timevar_pop (TV_DUMP);
2248 timevar_push (TV_GLOBAL_ALLOC);
2249 open_dump_file (DFI_greg, decl);
2251 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2252 pass fixing up any insns that are invalid. */
2255 failure = global_alloc (rtl_dump_file);
2258 build_insn_chain (insns);
2259 failure = reload (insns, 0);
2262 timevar_pop (TV_GLOBAL_ALLOC);
2264 if (dump_file[DFI_greg].enabled)
2266 timevar_push (TV_DUMP);
2268 dump_global_regs (rtl_dump_file);
2270 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2271 timevar_pop (TV_DUMP);
2277 /* Run the regrename and cprop passes. */
2279 rest_of_handle_regrename (tree decl, rtx insns)
2281 timevar_push (TV_RENAME_REGISTERS);
2282 open_dump_file (DFI_rnreg, decl);
2284 if (flag_rename_registers)
2285 regrename_optimize ();
2286 if (flag_cprop_registers)
2287 copyprop_hardreg_forward ();
2289 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2290 timevar_pop (TV_RENAME_REGISTERS);
2293 /* Reorder basic blocks. */
2295 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2297 open_dump_file (DFI_bbro, decl);
2299 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2300 splitting possibly introduced more crossjumping opportunities. */
2301 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2302 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2304 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2306 if (flag_reorder_blocks)
2307 reorder_basic_blocks ();
2308 if (flag_reorder_blocks
2309 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2310 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2312 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2315 #ifdef INSN_SCHEDULING
2316 /* Run instruction scheduler. */
2318 rest_of_handle_sched (tree decl, rtx insns)
2320 timevar_push (TV_SCHED);
2322 /* Print function header into sched dump now
2323 because doing the sched analysis makes some of the dump. */
2324 if (optimize > 0 && flag_schedule_insns)
2326 open_dump_file (DFI_sched, decl);
2328 /* Do control and data sched analysis,
2329 and write some of the results to dump file. */
2331 schedule_insns (rtl_dump_file);
2333 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2335 timevar_pop (TV_SCHED);
2340 /* Run second scheduling pass after reload. */
2342 rest_of_handle_sched2 (tree decl, rtx insns)
2344 timevar_push (TV_SCHED2);
2345 open_dump_file (DFI_sched2, decl);
2347 /* Do control and data sched analysis again,
2348 and write some more of the results to dump file. */
2350 split_all_insns (1);
2352 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2354 schedule_ebbs (rtl_dump_file);
2355 /* No liveness updating code yet, but it should be easy to do.
2356 reg-stack recompute the liveness when needed for now. */
2357 count_or_remove_death_notes (NULL, 1);
2358 cleanup_cfg (CLEANUP_EXPENSIVE);
2361 schedule_insns (rtl_dump_file);
2363 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2364 timevar_pop (TV_SCHED2);
2370 /* Register allocation pre-pass, to reduce number of moves necessary
2371 for two-address machines. */
2373 rest_of_handle_regmove (tree decl, rtx insns)
2375 timevar_push (TV_REGMOVE);
2376 open_dump_file (DFI_regmove, decl);
2378 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2380 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2381 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2382 timevar_pop (TV_REGMOVE);
2389 rest_of_handle_tracer (tree decl, rtx insns)
2391 open_dump_file (DFI_tracer, decl);
2393 dump_flow_info (rtl_dump_file);
2395 cleanup_cfg (CLEANUP_EXPENSIVE);
2396 reg_scan (insns, max_reg_num (), 0);
2397 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2400 /* If-conversion and CFG cleanup. */
2402 rest_of_handle_if_conversion (tree decl, rtx insns)
2404 open_dump_file (DFI_ce1, decl);
2405 if (flag_if_conversion)
2407 timevar_push (TV_IFCVT);
2409 dump_flow_info (rtl_dump_file);
2410 cleanup_cfg (CLEANUP_EXPENSIVE);
2411 reg_scan (insns, max_reg_num (), 0);
2413 timevar_pop (TV_IFCVT);
2415 timevar_push (TV_JUMP);
2416 cleanup_cfg (CLEANUP_EXPENSIVE);
2417 reg_scan (insns, max_reg_num (), 0);
2418 timevar_pop (TV_JUMP);
2419 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2422 /* Rerun if-conversion, as combine may have simplified things enough
2423 to now meet sequence length restrictions. */
2425 rest_of_handle_if_after_combine (tree decl, rtx insns)
2427 timevar_push (TV_IFCVT);
2428 open_dump_file (DFI_ce2, decl);
2434 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2435 timevar_pop (TV_IFCVT);
2439 rest_of_handle_web (tree decl, rtx insns)
2441 open_dump_file (DFI_web, decl);
2442 timevar_push (TV_WEB);
2444 delete_trivially_dead_insns (insns, max_reg_num ());
2445 cleanup_cfg (CLEANUP_EXPENSIVE);
2447 timevar_pop (TV_WEB);
2448 close_dump_file (DFI_web, print_rtl_with_bb, insns);
2449 reg_scan (get_insns (), max_reg_num (), 0);
2452 /* Do branch profiling and static profile estimation passes. */
2454 rest_of_handle_branch_prob (tree decl, rtx insns)
2458 timevar_push (TV_BRANCH_PROB);
2459 open_dump_file (DFI_bp, decl);
2461 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2464 /* Discover and record the loop depth at the head of each basic
2465 block. The loop infrastructure does the real job for us. */
2466 flow_loops_find (&loops, LOOP_TREE);
2469 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2471 /* Estimate using heuristics if no profiling info is available. */
2472 if (flag_guess_branch_prob)
2473 estimate_probability (&loops);
2475 flow_loops_free (&loops);
2476 free_dominance_info (CDI_DOMINATORS);
2477 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2478 timevar_pop (TV_BRANCH_PROB);
2481 /* Do optimizations based on expression value profiles. */
2483 rest_of_handle_value_profile_transformations (tree decl, rtx insns)
2485 open_dump_file (DFI_vpt, decl);
2486 timevar_push (TV_VPT);
2488 if (value_profile_transformations ())
2489 cleanup_cfg (CLEANUP_EXPENSIVE);
2491 timevar_pop (TV_VPT);
2492 close_dump_file (DFI_vpt, print_rtl_with_bb, insns);
2495 /* Do control and data flow analysis; write some of the results to the
2498 rest_of_handle_cfg (tree decl, rtx insns)
2500 open_dump_file (DFI_cfg, decl);
2502 dump_flow_info (rtl_dump_file);
2504 cleanup_cfg (CLEANUP_EXPENSIVE
2505 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2507 /* It may make more sense to mark constant functions after dead code is
2508 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2509 may insert code making function non-constant, but we still must consider
2510 it as constant, otherwise -fbranch-probabilities will not read data back.
2512 life_analysis rarely eliminates modification of external memory.
2515 mark_constant_function ();
2517 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2520 /* Purge addressofs. */
2522 rest_of_handle_addressof (tree decl, rtx insns)
2524 open_dump_file (DFI_addressof, decl);
2526 purge_addressof (insns);
2527 if (optimize && purge_all_dead_edges (0))
2528 delete_unreachable_blocks ();
2529 reg_scan (insns, max_reg_num (), 1);
2531 close_dump_file (DFI_addressof, print_rtl, insns);
2534 /* We may have potential sibling or tail recursion sites. Select one
2535 (of possibly multiple) methods of performing the call. */
2537 rest_of_handle_sibling_calls (rtx insns)
2540 optimize_sibling_and_tail_recursive_calls ();
2542 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2543 free_bb_for_insn ();
2544 find_exception_handler_labels ();
2545 rebuild_jump_labels (insns);
2546 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2548 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2549 notes before simplifying cfg and we must do lowering after sibcall
2550 that unhides parts of RTL chain and cleans up the CFG.
2552 Until sibcall is replaced by tree-level optimizer, lets just
2553 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2554 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2555 if (GET_CODE (insn) == NOTE
2556 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2559 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2562 /* Perform jump bypassing and control flow optimizations. */
2564 rest_of_handle_jump_bypass (tree decl, rtx insns)
2566 timevar_push (TV_BYPASS);
2567 open_dump_file (DFI_bypass, decl);
2569 cleanup_cfg (CLEANUP_EXPENSIVE);
2570 reg_scan (insns, max_reg_num (), 1);
2572 if (bypass_jumps (rtl_dump_file))
2574 rebuild_jump_labels (insns);
2575 cleanup_cfg (CLEANUP_EXPENSIVE);
2576 delete_trivially_dead_insns (insns, max_reg_num ());
2579 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2580 timevar_pop (TV_BYPASS);
2584 #ifdef ENABLE_CHECKING
2585 verify_flow_info ();
2589 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2590 if we must exit rest_of_compilation upon return. */
2592 rest_of_handle_inlining (tree decl)
2599 /* If we are reconsidering an inline function at the end of
2600 compilation, skip the stuff for making it inline. */
2601 if (cfun->rtl_inline_init)
2603 cfun->rtl_inline_init = 1;
2605 /* If this is nested inside an inlined external function, pretend
2606 it was only declared. Since we cannot inline such functions,
2607 generating code for this one is not only not necessary but will
2608 confuse some debugging output writers. */
2609 for (parent = DECL_CONTEXT (current_function_decl);
2610 parent != NULL_TREE;
2611 parent = get_containing_scope (parent))
2612 if (TREE_CODE (parent) == FUNCTION_DECL
2613 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2615 DECL_INITIAL (decl) = 0;
2618 else if (TYPE_P (parent))
2619 /* A function in a local class should be treated normally. */
2622 /* If requested, consider whether to make this function inline. */
2623 if ((DECL_INLINE (decl) && !flag_no_inline)
2624 || flag_inline_functions)
2626 timevar_push (TV_INTEGRATION);
2627 lose = function_cannot_inline_p (decl);
2628 timevar_pop (TV_INTEGRATION);
2629 if (lose || ! optimize)
2631 if (warn_inline && lose && DECL_INLINE (decl))
2633 char *msg = concat ("%J", lose, NULL);
2634 warning (msg, decl);
2637 DECL_ABSTRACT_ORIGIN (decl) = 0;
2638 /* Don't really compile an extern inline function.
2639 If we can't make it inline, pretend
2640 it was only declared. */
2641 if (DECL_EXTERNAL (decl))
2643 DECL_INITIAL (decl) = 0;
2648 inlinable = DECL_INLINE (decl) = 1;
2651 insns = get_insns ();
2653 /* Dump the rtl code if we are dumping rtl. */
2655 if (open_dump_file (DFI_rtl, decl))
2657 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2658 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2659 close_dump_file (DFI_rtl, print_rtl, insns);
2662 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2663 sorts of eh initialization. Delay this until after the
2664 initial rtl dump so that we can see the original nesting. */
2665 convert_from_eh_region_ranges ();
2667 /* If function is inline, and we don't yet know whether to
2668 compile it by itself, defer decision till end of compilation.
2669 wrapup_global_declarations will (indirectly) call
2670 rest_of_compilation again for those functions that need to
2671 be output. Also defer those functions that we are supposed
2675 || (DECL_INLINE (decl)
2676 && flag_inline_functions
2677 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2678 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2679 && ! flag_keep_inline_functions)
2680 || DECL_EXTERNAL (decl))))
2681 DECL_DEFER_OUTPUT (decl) = 1;
2683 if (DECL_INLINE (decl))
2684 /* DWARF wants separate debugging info for abstract and
2685 concrete instances of all inline functions, including those
2686 declared inline but not inlined, and those inlined even
2687 though they weren't declared inline. Conveniently, that's
2688 what DECL_INLINE means at this point. */
2689 (*debug_hooks->deferred_inline_function) (decl);
2691 if (DECL_DEFER_OUTPUT (decl))
2693 /* If -Wreturn-type, we have to do a bit of compilation. We just
2694 want to call cleanup the cfg to figure out whether or not we can
2695 fall off the end of the function; we do the minimum amount of
2696 work necessary to make that safe. */
2697 if (warn_return_type)
2699 int saved_optimize = optimize;
2702 rebuild_jump_labels (insns);
2703 find_exception_handler_labels ();
2704 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2705 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2706 optimize = saved_optimize;
2708 /* CFG is no longer maintained up-to-date. */
2709 free_bb_for_insn ();
2712 set_nothrow_function_flags ();
2713 if (current_function_nothrow)
2714 /* Now we know that this can't throw; set the flag for the benefit
2715 of other functions later in this translation unit. */
2716 TREE_NOTHROW (current_function_decl) = 1;
2718 timevar_push (TV_INTEGRATION);
2719 save_for_inline (decl);
2720 timevar_pop (TV_INTEGRATION);
2721 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2725 /* If specified extern inline but we aren't inlining it, we are
2726 done. This goes for anything that gets here with DECL_EXTERNAL
2727 set, not just things with DECL_INLINE. */
2728 return (bool) DECL_EXTERNAL (decl);
2731 /* Try to identify useless null pointer tests and delete them. */
2733 rest_of_handle_null_pointer (tree decl, rtx insns)
2735 open_dump_file (DFI_null, decl);
2737 dump_flow_info (rtl_dump_file);
2739 if (delete_null_pointer_checks (insns))
2740 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2742 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2745 /* Try combining insns through substitution. */
2747 rest_of_handle_combine (tree decl, rtx insns)
2749 int rebuild_jump_labels_after_combine = 0;
2751 timevar_push (TV_COMBINE);
2752 open_dump_file (DFI_combine, decl);
2754 rebuild_jump_labels_after_combine
2755 = combine_instructions (insns, max_reg_num ());
2757 /* Combining insns may have turned an indirect jump into a
2758 direct jump. Rebuild the JUMP_LABEL fields of jumping
2760 if (rebuild_jump_labels_after_combine)
2762 timevar_push (TV_JUMP);
2763 rebuild_jump_labels (insns);
2764 timevar_pop (TV_JUMP);
2766 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2769 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2770 timevar_pop (TV_COMBINE);
2775 /* Perform life analysis. */
2777 rest_of_handle_life (tree decl, rtx insns)
2779 open_dump_file (DFI_life, decl);
2782 #ifdef ENABLE_CHECKING
2783 verify_flow_info ();
2785 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2787 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2788 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2789 timevar_pop (TV_FLOW);
2791 if (warn_uninitialized)
2793 uninitialized_vars_warning (DECL_INITIAL (decl));
2795 setjmp_args_warning ();
2800 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2802 /* Insns were inserted, and possibly pseudos created, so
2803 things might look a bit different. */
2804 insns = get_insns ();
2805 allocate_reg_life_data ();
2806 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2807 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2813 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2818 /* Perform common subexpression elimination. Nonzero value from
2819 `cse_main' means that jumps were simplified and some code may now
2820 be unreachable, so do jump optimization again. */
2822 rest_of_handle_cse (tree decl, rtx insns)
2826 open_dump_file (DFI_cse, decl);
2828 dump_flow_info (rtl_dump_file);
2829 timevar_push (TV_CSE);
2831 reg_scan (insns, max_reg_num (), 1);
2833 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2835 rebuild_jump_labels (insns);
2836 if (purge_all_dead_edges (0))
2837 delete_unreachable_blocks ();
2839 delete_trivially_dead_insns (insns, max_reg_num ());
2841 /* If we are not running more CSE passes, then we are no longer
2842 expecting CSE to be run. But always rerun it in a cheap mode. */
2843 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2845 if (tem || optimize > 1)
2846 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2847 /* Try to identify useless null pointer tests and delete them. */
2848 if (flag_delete_null_pointer_checks)
2850 timevar_push (TV_JUMP);
2852 if (delete_null_pointer_checks (insns))
2853 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2854 timevar_pop (TV_JUMP);
2857 /* The second pass of jump optimization is likely to have
2858 removed a bunch more instructions. */
2859 renumber_insns (rtl_dump_file);
2861 timevar_pop (TV_CSE);
2862 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2865 /* Run second CSE pass after loop optimizations. */
2867 rest_of_handle_cse2 (tree decl, rtx insns)
2871 timevar_push (TV_CSE2);
2872 open_dump_file (DFI_cse2, decl);
2874 dump_flow_info (rtl_dump_file);
2875 /* CFG is no longer maintained up-to-date. */
2876 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2877 purge_all_dead_edges (0);
2878 delete_trivially_dead_insns (insns, max_reg_num ());
2882 timevar_push (TV_JUMP);
2883 rebuild_jump_labels (insns);
2884 cleanup_cfg (CLEANUP_EXPENSIVE);
2885 timevar_pop (TV_JUMP);
2887 reg_scan (insns, max_reg_num (), 0);
2888 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2890 timevar_pop (TV_CSE2);
2893 /* Perform global cse. */
2895 rest_of_handle_gcse (tree decl, rtx insns)
2897 int save_csb, save_cfj;
2900 timevar_push (TV_GCSE);
2901 open_dump_file (DFI_gcse, decl);
2903 tem = gcse_main (insns, rtl_dump_file);
2904 rebuild_jump_labels (insns);
2905 delete_trivially_dead_insns (insns, max_reg_num ());
2907 save_csb = flag_cse_skip_blocks;
2908 save_cfj = flag_cse_follow_jumps;
2909 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2911 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2912 if (current_function_calls_constant_p)
2913 purge_builtin_constant_p ();
2915 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2917 if (flag_expensive_optimizations)
2919 timevar_push (TV_CSE);
2920 reg_scan (insns, max_reg_num (), 1);
2921 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2922 purge_all_dead_edges (0);
2923 delete_trivially_dead_insns (insns, max_reg_num ());
2924 timevar_pop (TV_CSE);
2925 cse_not_expected = !flag_rerun_cse_after_loop;
2928 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2929 things up. Then possibly re-run CSE again. */
2933 timevar_push (TV_JUMP);
2934 rebuild_jump_labels (insns);
2935 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2936 timevar_pop (TV_JUMP);
2938 if (flag_expensive_optimizations)
2940 timevar_push (TV_CSE);
2941 reg_scan (insns, max_reg_num (), 1);
2942 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2943 purge_all_dead_edges (0);
2944 delete_trivially_dead_insns (insns, max_reg_num ());
2945 timevar_pop (TV_CSE);
2949 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2950 timevar_pop (TV_GCSE);
2953 flag_cse_skip_blocks = save_csb;
2954 flag_cse_follow_jumps = save_cfj;
2955 #ifdef ENABLE_CHECKING
2956 verify_flow_info ();
2960 /* Move constant computations out of loops. */
2962 rest_of_handle_loop_optimize (tree decl, rtx insns)
2964 int do_unroll, do_prefetch;
2966 timevar_push (TV_LOOP);
2967 delete_dead_jumptables ();
2968 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2969 open_dump_file (DFI_loop, decl);
2971 /* CFG is no longer maintained up-to-date. */
2972 free_bb_for_insn ();
2974 if (flag_unroll_loops)
2975 do_unroll = LOOP_AUTO_UNROLL; /* Having two unrollers is useless. */
2977 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2978 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2980 if (flag_rerun_loop_opt)
2982 cleanup_barriers ();
2984 /* We only want to perform unrolling once. */
2985 loop_optimize (insns, rtl_dump_file, do_unroll);
2988 /* The first call to loop_optimize makes some instructions
2989 trivially dead. We delete those instructions now in the
2990 hope that doing so will make the heuristics in loop work
2991 better and possibly speed up compilation. */
2992 delete_trivially_dead_insns (insns, max_reg_num ());
2994 /* The regscan pass is currently necessary as the alias
2995 analysis code depends on this information. */
2996 reg_scan (insns, max_reg_num (), 1);
2998 cleanup_barriers ();
2999 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3001 /* Loop can create trivially dead instructions. */
3002 delete_trivially_dead_insns (insns, max_reg_num ());
3003 close_dump_file (DFI_loop, print_rtl, insns);
3004 timevar_pop (TV_LOOP);
3005 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3010 /* Perform loop optimizations. It might be better to do them a bit
3011 sooner, but we want the profile feedback to work more
3014 rest_of_handle_loop2 (tree decl, rtx insns)
3016 struct loops *loops;
3017 timevar_push (TV_LOOP);
3018 open_dump_file (DFI_loop2, decl);
3020 dump_flow_info (rtl_dump_file);
3022 loops = loop_optimizer_init (rtl_dump_file);
3026 /* The optimizations: */
3027 if (flag_unswitch_loops)
3028 unswitch_loops (loops);
3030 if (flag_peel_loops || flag_unroll_loops)
3031 unroll_and_peel_loops (loops,
3032 (flag_peel_loops ? UAP_PEEL : 0) |
3033 (flag_unroll_loops ? UAP_UNROLL : 0) |
3034 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3036 loop_optimizer_finalize (loops, rtl_dump_file);
3039 cleanup_cfg (CLEANUP_EXPENSIVE);
3040 delete_trivially_dead_insns (insns, max_reg_num ());
3041 reg_scan (insns, max_reg_num (), 0);
3043 dump_flow_info (rtl_dump_file);
3044 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3045 timevar_pop (TV_LOOP);
3049 /* This is called from finish_function (within langhooks.parse_file)
3050 after each top-level definition is parsed.
3051 It is supposed to compile that function or variable
3052 and output the assembler code for it.
3053 After we return, the tree storage is freed. */
3056 rest_of_compilation (tree decl)
3060 timevar_push (TV_REST_OF_COMPILATION);
3062 /* Register rtl specific functions for cfg. */
3063 rtl_register_cfg_hooks ();
3065 /* Now that we're out of the frontend, we shouldn't have any more
3066 CONCATs anywhere. */
3067 generating_concat_p = 0;
3069 /* When processing delayed functions, prepare_function_start() won't
3070 have been run to re-initialize it. */
3071 cse_not_expected = ! optimize;
3073 /* First, make sure that NOTE_BLOCK is set correctly for each
3074 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3075 if (!cfun->x_whole_function_mode_p)
3078 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3079 tree in sensible shape. So, we just recalculate it here. */
3080 if (cfun->x_whole_function_mode_p)
3085 if (rest_of_handle_inlining (decl))
3086 goto exit_rest_of_compilation;
3088 /* If we're emitting a nested function, make sure its parent gets
3089 emitted as well. Doing otherwise confuses debug info. */
3092 for (parent = DECL_CONTEXT (current_function_decl);
3093 parent != NULL_TREE;
3094 parent = get_containing_scope (parent))
3095 if (TREE_CODE (parent) == FUNCTION_DECL)
3096 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3099 /* We are now committed to emitting code for this function. Do any
3100 preparation, such as emitting abstract debug info for the inline
3101 before it gets mangled by optimization. */
3102 if (cgraph_function_possibly_inlined_p (decl))
3103 (*debug_hooks->outlining_inline_function) (decl);
3105 /* Remove any notes we don't need. That will make iterating
3106 over the instruction sequence faster, and allow the garbage
3107 collector to reclaim the memory used by the notes. */
3108 remove_unnecessary_notes ();
3113 /* Initialize some variables used by the optimizers. */
3114 init_function_for_compilation ();
3116 if (! DECL_DEFER_OUTPUT (decl))
3117 TREE_ASM_WRITTEN (decl) = 1;
3119 /* Now that integrate will no longer see our rtl, we need not
3120 distinguish between the return value of this function and the
3121 return value of called functions. Also, we can remove all SETs
3122 of subregs of hard registers; they are only here because of
3123 integrate. Also, we can now initialize pseudos intended to
3124 carry magic hard reg data throughout the function. */
3125 rtx_equal_function_value_matters = 0;
3126 purge_hard_subreg_sets (get_insns ());
3128 /* Early return if there were errors. We can run afoul of our
3129 consistency checks, and there's not really much point in fixing them.
3130 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3131 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3132 || errorcount || sorrycount)
3133 goto exit_rest_of_compilation;
3135 timevar_push (TV_JUMP);
3136 open_dump_file (DFI_sibling, decl);
3137 insns = get_insns ();
3138 rebuild_jump_labels (insns);
3139 find_exception_handler_labels ();
3140 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3142 delete_unreachable_blocks ();
3144 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3145 if (flag_guess_branch_prob)
3147 timevar_push (TV_BRANCH_PROB);
3148 note_prediction_to_br_prob ();
3149 timevar_pop (TV_BRANCH_PROB);
3152 if (flag_optimize_sibling_calls)
3153 rest_of_handle_sibling_calls (insns);
3155 /* We have to issue these warnings now already, because CFG cleanups
3156 further down may destroy the required information. However, this
3157 must be done after the sibcall optimization pass because the barrier
3158 emitted for noreturn calls that are candidate for the optimization
3159 is folded into the CALL_PLACEHOLDER until after this pass, so the
3160 CFG is inaccurate. */
3161 check_function_return_warnings ();
3163 timevar_pop (TV_JUMP);
3165 insn_locators_initialize ();
3166 /* Complete generation of exception handling code. */
3169 timevar_push (TV_JUMP);
3170 open_dump_file (DFI_eh, decl);
3172 finish_eh_generation ();
3174 close_dump_file (DFI_eh, print_rtl, get_insns ());
3175 timevar_pop (TV_JUMP);
3178 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3179 generation, which might create new sets. */
3180 emit_initial_value_sets ();
3183 /* If we are doing position-independent code generation, now
3184 is the time to output special prologues and epilogues.
3185 We do not want to do this earlier, because it just clutters
3186 up inline functions with meaningless insns. */
3191 insns = get_insns ();
3193 /* Copy any shared structure that should not be shared. */
3194 unshare_all_rtl (current_function_decl, insns);
3196 #ifdef SETJMP_VIA_SAVE_AREA
3197 /* This must be performed before virtual register instantiation.
3198 Please be aware the everything in the compiler that can look
3199 at the RTL up to this point must understand that REG_SAVE_AREA
3200 is just like a use of the REG contained inside. */
3201 if (current_function_calls_alloca)
3202 optimize_save_area_alloca (insns);
3205 /* Instantiate all virtual registers. */
3206 instantiate_virtual_regs (current_function_decl, insns);
3208 open_dump_file (DFI_jump, decl);
3210 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3211 are initialized and to compute whether control can drop off the end
3214 timevar_push (TV_JUMP);
3215 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3216 before jump optimization switches branch directions. */
3217 if (flag_guess_branch_prob)
3218 expected_value_to_br_prob ();
3220 reg_scan (insns, max_reg_num (), 0);
3221 rebuild_jump_labels (insns);
3222 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3223 delete_trivially_dead_insns (insns, max_reg_num ());
3225 dump_flow_info (rtl_dump_file);
3226 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3227 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3231 free_bb_for_insn ();
3232 copy_loop_headers (insns);
3233 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3235 purge_line_number_notes (insns);
3237 timevar_pop (TV_JUMP);
3238 close_dump_file (DFI_jump, print_rtl, insns);
3240 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3241 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3242 goto exit_rest_of_compilation;
3244 timevar_push (TV_JUMP);
3247 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3249 if (flag_delete_null_pointer_checks)
3250 rest_of_handle_null_pointer (decl, insns);
3252 /* Jump optimization, and the removal of NULL pointer checks, may
3253 have reduced the number of instructions substantially. CSE, and
3254 future passes, allocate arrays whose dimensions involve the
3255 maximum instruction UID, so if we can reduce the maximum UID
3256 we'll save big on memory. */
3257 renumber_insns (rtl_dump_file);
3258 timevar_pop (TV_JUMP);
3260 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3265 rest_of_handle_cse (decl, insns);
3267 rest_of_handle_addressof (decl, insns);
3274 rest_of_handle_gcse (decl, insns);
3276 if (flag_loop_optimize)
3277 rest_of_handle_loop_optimize (decl, insns);
3280 timevar_push (TV_FLOW);
3282 rest_of_handle_cfg (decl, insns);
3285 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3287 rest_of_handle_branch_prob (decl, insns);
3289 if (flag_branch_probabilities
3290 && flag_profile_values
3291 && flag_value_profile_transformations)
3292 rest_of_handle_value_profile_transformations (decl, insns);
3294 /* Remove the death notes created for vpt. */
3295 if (flag_profile_values)
3296 count_or_remove_death_notes (NULL, 1);
3300 rest_of_handle_if_conversion (decl, insns);
3303 rest_of_handle_tracer (decl, insns);
3307 if (flag_unswitch_loops
3309 || flag_unroll_loops)
3310 rest_of_handle_loop2 (decl, insns);
3313 rest_of_handle_jump_bypass (decl, insns);
3317 rest_of_handle_web (decl, insns);
3319 if (flag_rerun_cse_after_loop)
3320 rest_of_handle_cse2 (decl, insns);
3322 cse_not_expected = 1;
3324 rest_of_handle_life (decl, insns);
3327 rest_of_handle_combine (decl, insns);
3329 if (flag_if_conversion)
3330 rest_of_handle_if_after_combine (decl, insns);
3332 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3333 rest_of_handle_regmove (decl, insns);
3335 /* Do unconditional splitting before register allocation to allow machine
3336 description to add extra information not needed previously. */
3337 split_all_insns (1);
3339 #ifdef OPTIMIZE_MODE_SWITCHING
3340 timevar_push (TV_MODE_SWITCH);
3343 optimize_mode_switching (NULL);
3346 timevar_pop (TV_MODE_SWITCH);
3349 /* Any of the several passes since flow1 will have munged register
3350 lifetime data a bit. We need it to be up to date for scheduling
3351 (see handling of reg_known_equiv in init_alias_analysis). */
3352 recompute_reg_usage (insns, !optimize_size);
3354 #ifdef INSN_SCHEDULING
3355 rest_of_handle_sched (decl, insns);
3358 /* Determine if the current function is a leaf before running reload
3359 since this can impact optimizations done by the prologue and
3360 epilogue thus changing register elimination offsets. */
3361 current_function_is_leaf = leaf_function_p ();
3363 timevar_push (TV_LOCAL_ALLOC);
3364 open_dump_file (DFI_lreg, decl);
3366 if (flag_new_regalloc)
3368 if (rest_of_handle_new_regalloc (decl, insns))
3369 goto exit_rest_of_compilation;
3373 if (rest_of_handle_old_regalloc (decl, insns))
3374 goto exit_rest_of_compilation;
3379 open_dump_file (DFI_postreload, decl);
3381 /* Do a very simple CSE pass over just the hard registers. */
3384 timevar_push (TV_RELOAD_CSE_REGS);
3385 reload_cse_regs (insns);
3386 timevar_pop (TV_RELOAD_CSE_REGS);
3389 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3391 /* Re-create the death notes which were deleted during reload. */
3392 timevar_push (TV_FLOW2);
3393 open_dump_file (DFI_flow2, decl);
3395 #ifdef ENABLE_CHECKING
3396 verify_flow_info ();
3399 /* If optimizing, then go ahead and split insns now. */
3403 split_all_insns (0);
3405 if (flag_branch_target_load_optimize)
3407 open_dump_file (DFI_branch_target_load, decl);
3409 branch_target_load_optimize (insns, false);
3411 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3417 cleanup_cfg (CLEANUP_EXPENSIVE);
3419 /* On some machines, the prologue and epilogue code, or parts thereof,
3420 can be represented as RTL. Doing so lets us schedule insns between
3421 it and the rest of the code and also allows delayed branch
3422 scheduling to operate in the epilogue. */
3423 thread_prologue_and_epilogue_insns (insns);
3424 epilogue_completed = 1;
3428 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3429 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3430 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3432 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3433 even for machines with possibly nonzero RETURN_POPS_ARGS
3434 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3435 push instructions will have popping returns. */
3436 #ifndef PUSH_ROUNDING
3437 if (!ACCUMULATE_OUTGOING_ARGS)
3439 combine_stack_adjustments ();
3444 flow2_completed = 1;
3446 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3447 timevar_pop (TV_FLOW2);
3449 #ifdef HAVE_peephole2
3450 if (optimize > 0 && flag_peephole2)
3452 timevar_push (TV_PEEPHOLE2);
3453 open_dump_file (DFI_peephole2, decl);
3455 peephole2_optimize (rtl_dump_file);
3457 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3458 timevar_pop (TV_PEEPHOLE2);
3462 if (flag_if_conversion2)
3464 timevar_push (TV_IFCVT2);
3465 open_dump_file (DFI_ce3, decl);
3469 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3470 timevar_pop (TV_IFCVT2);
3475 if (flag_rename_registers || flag_cprop_registers)
3476 rest_of_handle_regrename (decl, insns);
3478 rest_of_handle_reorder_blocks (decl, insns);
3481 if (flag_branch_target_load_optimize2)
3483 /* Leave this a warning for now so that it is possible to experiment
3484 with running this pass twice. In 3.6, we should either make this
3485 an error, or use separate dump files. */
3486 if (flag_branch_target_load_optimize)
3487 warning ("branch target register load optimization is not intended "
3490 open_dump_file (DFI_branch_target_load, decl);
3492 branch_target_load_optimize (insns, true);
3494 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3499 #ifdef INSN_SCHEDULING
3500 if (optimize > 0 && flag_schedule_insns_after_reload)
3501 rest_of_handle_sched2 (decl, insns);
3504 #ifdef LEAF_REGISTERS
3505 current_function_uses_only_leaf_regs
3506 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3510 rest_of_handle_stack_regs (decl, insns);
3513 compute_alignments ();
3515 /* CFG is no longer maintained up-to-date. */
3516 free_bb_for_insn ();
3518 if (targetm.machine_dependent_reorg != 0)
3519 rest_of_handle_machine_reorg (decl, insns);
3521 purge_line_number_notes (insns);
3522 cleanup_barriers ();
3525 if (optimize > 0 && flag_delayed_branch)
3526 rest_of_handle_delay_slots (decl, insns);
3529 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3530 timevar_push (TV_SHORTEN_BRANCH);
3531 split_all_insns_noflow ();
3532 timevar_pop (TV_SHORTEN_BRANCH);
3535 convert_to_eh_region_ranges ();
3537 /* Shorten branches. */
3538 timevar_push (TV_SHORTEN_BRANCH);
3539 shorten_branches (get_insns ());
3540 timevar_pop (TV_SHORTEN_BRANCH);
3542 set_nothrow_function_flags ();
3543 if (current_function_nothrow)
3544 /* Now we know that this can't throw; set the flag for the benefit
3545 of other functions later in this translation unit. */
3546 TREE_NOTHROW (current_function_decl) = 1;
3548 rest_of_handle_final (decl, insns);
3550 /* Write DBX symbols if requested. */
3552 /* Note that for those inline functions where we don't initially
3553 know for certain that we will be generating an out-of-line copy,
3554 the first invocation of this routine (rest_of_compilation) will
3555 skip over this code by doing a `goto exit_rest_of_compilation;'.
3556 Later on, wrapup_global_declarations will (indirectly) call
3557 rest_of_compilation again for those inline functions that need
3558 to have out-of-line copies generated. During that call, we
3559 *will* be routed past here. */
3561 timevar_push (TV_SYMOUT);
3562 (*debug_hooks->function_decl) (decl);
3563 timevar_pop (TV_SYMOUT);
3565 exit_rest_of_compilation:
3567 coverage_end_function ();
3569 /* In case the function was not output,
3570 don't leave any temporary anonymous types
3571 queued up for sdb output. */
3572 #ifdef SDB_DEBUGGING_INFO
3573 if (write_symbols == SDB_DEBUG)
3574 sdbout_types (NULL_TREE);
3577 reload_completed = 0;
3578 epilogue_completed = 0;
3579 flow2_completed = 0;
3582 timevar_push (TV_FINAL);
3584 /* Clear out the insn_length contents now that they are no
3586 init_insn_lengths ();
3588 /* Show no temporary slots allocated. */
3591 free_basic_block_vars (0);
3592 free_bb_for_insn ();
3594 timevar_pop (TV_FINAL);
3596 if ((*targetm.binds_local_p) (current_function_decl))
3598 int pref = cfun->preferred_stack_boundary;
3599 if (cfun->recursive_call_emit
3600 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3601 pref = cfun->stack_alignment_needed;
3602 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3606 /* Make sure volatile mem refs aren't considered valid operands for
3607 arithmetic insns. We must call this here if this is a nested inline
3608 function, since the above code leaves us in the init_recog state
3609 (from final.c), and the function context push/pop code does not
3610 save/restore volatile_ok.
3612 ??? Maybe it isn't necessary for expand_start_function to call this
3613 anymore if we do it here? */
3615 init_recog_no_volatile ();
3617 /* We're done with this function. Free up memory if we can. */
3618 free_after_parsing (cfun);
3619 if (! DECL_DEFER_OUTPUT (decl))
3621 free_after_compilation (cfun);
3622 DECL_SAVED_INSNS (decl) = 0;
3628 timevar_pop (TV_REST_OF_COMPILATION);
3631 /* Display help for target options. */
3633 display_target_options (void)
3636 static bool displayed = false;
3638 /* Avoid double printing for --help --target-help. */
3644 if (ARRAY_SIZE (target_switches) > 1
3645 #ifdef TARGET_OPTIONS
3646 || ARRAY_SIZE (target_options) > 1
3654 printf (_("\nTarget specific options:\n"));
3656 for (i = ARRAY_SIZE (target_switches); i--;)
3658 const char *option = target_switches[i].name;
3659 const char *description = target_switches[i].description;
3661 if (option == NULL || *option == 0)
3663 else if (description == NULL)
3668 printf (_(" -m%-23s [undocumented]\n"), option);
3670 else if (*description != 0)
3671 doc += printf (" -m%-23s %s\n", option, _(description));
3674 #ifdef TARGET_OPTIONS
3675 for (i = ARRAY_SIZE (target_options); i--;)
3677 const char *option = target_options[i].prefix;
3678 const char *description = target_options[i].description;
3680 if (option == NULL || *option == 0)
3682 else if (description == NULL)
3687 printf (_(" -m%-23s [undocumented]\n"), option);
3689 else if (*description != 0)
3690 doc += printf (" -m%-23s %s\n", option, _(description));
3696 printf (_("\nThere are undocumented target specific options as well.\n"));
3698 printf (_(" They exist, but they are not documented.\n"));
3703 /* Parse a -d... command line switch. */
3706 decode_d_option (const char *arg)
3714 for (i = 0; i < (int) DFI_MAX; ++i)
3715 dump_file[i].enabled = 1;
3721 flag_print_asm_name = 1;
3724 flag_dump_rtl_in_asm = 1;
3725 flag_print_asm_name = 1;
3728 graph_dump_format = vcg;
3731 rtl_dump_and_exit = 1;
3736 case 'D': /* These are handled by the preprocessor. */
3740 setup_core_dumping();
3745 for (i = 0; i < (int) DFI_MAX; ++i)
3746 if (c == dump_file[i].debug_switch)
3748 dump_file[i].enabled = 1;
3753 warning ("unrecognized gcc debugging option: %c", c);
3758 /* Indexed by enum debug_info_type. */
3759 const char *const debug_type_names[] =
3761 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3764 /* Decode -m switches. */
3765 /* Decode the switch -mNAME. */
3768 set_target_switch (const char *name)
3771 int valid_target_option = 0;
3773 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3774 if (!strcmp (target_switches[j].name, name))
3776 if (target_switches[j].value < 0)
3777 target_flags &= ~-target_switches[j].value;
3779 target_flags |= target_switches[j].value;
3782 if (target_switches[j].value < 0)
3783 target_flags_explicit |= -target_switches[j].value;
3785 target_flags_explicit |= target_switches[j].value;
3787 valid_target_option = 1;
3790 #ifdef TARGET_OPTIONS
3791 if (!valid_target_option)
3792 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3794 int len = strlen (target_options[j].prefix);
3795 if (target_options[j].value)
3797 if (!strcmp (target_options[j].prefix, name))
3799 *target_options[j].variable = target_options[j].value;
3800 valid_target_option = 1;
3805 if (!strncmp (target_options[j].prefix, name, len))
3807 *target_options[j].variable = name + len;
3808 valid_target_option = 1;
3814 if (!valid_target_option)
3815 error ("invalid option `%s'", name);
3818 /* Print version information to FILE.
3819 Each line begins with INDENT (for the case where FILE is the
3820 assembler output file). */
3823 print_version (FILE *file, const char *indent)
3826 #define __VERSION__ "[?]"
3830 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3832 "%s%s%s version %s (%s) compiled by CC.\n"
3834 , indent, *indent != 0 ? " " : "",
3835 lang_hooks.name, version_string, TARGET_NAME,
3836 indent, __VERSION__);
3837 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3838 indent, *indent != 0 ? " " : "",
3839 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3842 /* Print an option value and return the adjusted position in the line.
3843 ??? We don't handle error returns from fprintf (disk full); presumably
3844 other code will catch a disk full though. */
3847 print_single_switch (FILE *file, int pos, int max,
3848 const char *indent, const char *sep, const char *term,
3849 const char *type, const char *name)
3851 /* The ultrix fprintf returns 0 on success, so compute the result we want
3852 here since we need it for the following test. */
3853 int len = strlen (sep) + strlen (type) + strlen (name);
3858 fprintf (file, "%s", term);
3863 fprintf (file, "%s", indent);
3864 pos = strlen (indent);
3866 fprintf (file, "%s%s%s", sep, type, name);
3871 /* Print active target switches to FILE.
3872 POS is the current cursor position and MAX is the size of a "line".
3873 Each line begins with INDENT and ends with TERM.
3874 Each switch is separated from the next by SEP. */
3877 print_switch_values (FILE *file, int pos, int max,
3878 const char *indent, const char *sep, const char *term)
3883 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3884 that it can be printed below. This helps reproducibility. */
3887 /* Print the options as passed. */
3888 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3889 _("options passed: "), "");
3891 for (p = &save_argv[1]; *p != NULL; p++)
3895 if (strcmp (*p, "-o") == 0)
3901 if (strcmp (*p, "-quiet") == 0)
3903 if (strcmp (*p, "-version") == 0)
3908 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3911 fprintf (file, "%s", term);
3913 /* Print the -f and -m options that have been enabled.
3914 We don't handle language specific options but printing argv
3917 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3918 _("options enabled: "), "");
3920 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3921 if (*f_options[j].variable == f_options[j].on_value)
3922 pos = print_single_switch (file, pos, max, indent, sep, term,
3923 "-f", f_options[j].string);
3925 /* Print target specific options. */
3927 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3928 if (target_switches[j].name[0] != '\0'
3929 && target_switches[j].value > 0
3930 && ((target_switches[j].value & target_flags)
3931 == target_switches[j].value))
3933 pos = print_single_switch (file, pos, max, indent, sep, term,
3934 "-m", target_switches[j].name);
3937 #ifdef TARGET_OPTIONS
3938 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3939 if (*target_options[j].variable != NULL)
3942 sprintf (prefix, "-m%s", target_options[j].prefix);
3943 pos = print_single_switch (file, pos, max, indent, sep, term,
3944 prefix, *target_options[j].variable);
3948 fprintf (file, "%s", term);
3951 /* Open assembly code output file. Do this even if -fsyntax-only is
3952 on, because then the driver will have provided the name of a
3953 temporary file or bit bucket for us. NAME is the file specified on
3954 the command line, possibly NULL. */
3956 init_asm_output (const char *name)
3958 if (name == NULL && asm_file_name == 0)
3959 asm_out_file = stdout;
3962 if (asm_file_name == 0)
3964 int len = strlen (dump_base_name);
3965 char *dumpname = xmalloc (len + 6);
3966 memcpy (dumpname, dump_base_name, len + 1);
3967 strip_off_ending (dumpname, len);
3968 strcat (dumpname, ".s");
3969 asm_file_name = dumpname;
3971 if (!strcmp (asm_file_name, "-"))
3972 asm_out_file = stdout;
3974 asm_out_file = fopen (asm_file_name, "w+");
3975 if (asm_out_file == 0)
3976 fatal_error ("can't open %s for writing: %m", asm_file_name);
3979 #ifdef IO_BUFFER_SIZE
3980 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
3981 _IOFBF, IO_BUFFER_SIZE);
3984 if (!flag_syntax_only)
3986 targetm.asm_out.file_start ();
3988 #ifdef ASM_COMMENT_START
3989 if (flag_verbose_asm)
3991 /* Print the list of options in effect. */
3992 print_version (asm_out_file, ASM_COMMENT_START);
3993 print_switch_values (asm_out_file, 0, MAX_LINE,
3994 ASM_COMMENT_START, " ", "\n");
3995 /* Add a blank line here so it appears in assembler output but not
3997 fprintf (asm_out_file, "\n");
4003 /* Default version of get_pch_validity.
4004 By default, every flag difference is fatal; that will be mostly right for
4005 most targets, but completely right for very few. */
4008 default_get_pch_validity (size_t *len)
4010 #ifdef TARGET_OPTIONS
4015 *len = sizeof (target_flags) + 2;
4016 #ifdef TARGET_OPTIONS
4017 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4020 if (*target_options[i].variable)
4021 *len += strlen (*target_options[i].variable);
4025 result = r = xmalloc (*len);
4029 memcpy (r, &target_flags, sizeof (target_flags));
4030 r += sizeof (target_flags);
4032 #ifdef TARGET_OPTIONS
4033 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4035 const char *str = *target_options[i].variable;
4039 l = strlen (str) + 1;
4048 /* Default version of pch_valid_p. */
4051 default_pch_valid_p (const void *data_p, size_t len)
4053 const char *data = (const char *)data_p;
4054 const char *flag_that_differs = NULL;
4057 /* -fpic and -fpie also usually make a PCH invalid. */
4058 if (data[0] != flag_pic)
4059 return _("created and used with different settings of -fpic");
4060 if (data[1] != flag_pie)
4061 return _("created and used with different settings of -fpie");
4064 /* Check target_flags. */
4065 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
4067 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
4072 memcpy (&tf, data, sizeof (target_flags));
4074 bits = target_switches[i].value;
4077 if ((target_flags & bits) != (tf & bits))
4079 flag_that_differs = target_switches[i].name;
4085 data += sizeof (target_flags);
4086 len -= sizeof (target_flags);
4088 /* Check string options. */
4089 #ifdef TARGET_OPTIONS
4090 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4092 const char *str = *target_options[i].variable;
4096 l = strlen (str) + 1;
4097 if (len < l || memcmp (data, str, l) != 0)
4099 flag_that_differs = target_options[i].prefix;
4112 asprintf (&r, _("created and used with differing settings of `-m%s'"),
4115 return _("out of memory");
4120 /* Default tree printer. Handles declarations only. */
4122 default_tree_printer (pretty_printer * pp, text_info *text)
4124 switch (*text->format_spec)
4130 tree t = va_arg (*text->args_ptr, tree);
4131 const char *n = DECL_NAME (t)
4132 ? (*lang_hooks.decl_printable_name) (t, 2)
4143 /* Initialization of the front end environment, before command line
4144 options are parsed. Signal handlers, internationalization etc.
4145 ARGV0 is main's argv[0]. */
4147 general_init (const char *argv0)
4151 p = argv0 + strlen (argv0);
4152 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4156 xmalloc_set_program_name (progname);
4160 gcc_init_libintl ();
4162 /* Initialize the diagnostics reporting machinery, so option parsing
4163 can give warnings and errors. */
4164 diagnostic_initialize (global_dc);
4165 /* Set a default printer. Language specific initializations will
4166 override it later. */
4167 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4169 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4171 signal (SIGSEGV, crash_signal);
4174 signal (SIGILL, crash_signal);
4177 signal (SIGBUS, crash_signal);
4180 signal (SIGABRT, crash_signal);
4182 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4183 signal (SIGIOT, crash_signal);
4186 signal (SIGFPE, crash_signal);
4189 /* Other host-specific signal setup. */
4190 (*host_hooks.extra_signals)();
4192 /* Initialize the garbage-collector, string pools and tree type hash
4198 /* Initialize register usage now so switches may override. */
4201 /* Register the language-independent parameters. */
4202 add_params (lang_independent_params, LAST_PARAM);
4204 /* This must be done after add_params but before argument processing. */
4205 init_ggc_heuristics();
4208 /* Process the options that have been parsed. */
4210 process_options (void)
4212 /* Allow the front end to perform consistency checks and do further
4213 initialization based on the command line options. This hook also
4214 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4215 so we can correctly initialize debug output. */
4216 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4217 input_filename = main_input_filename;
4219 #ifdef OVERRIDE_OPTIONS
4220 /* Some machines may reject certain combinations of options. */
4224 /* Set aux_base_name if not already set. */
4227 else if (main_input_filename)
4229 char *name = xstrdup (lbasename (main_input_filename));
4231 strip_off_ending (name, strlen (name));
4232 aux_base_name = name;
4235 aux_base_name = "gccaux";
4237 /* Set up the align_*_log variables, defaulting them to 1 if they
4238 were still unset. */
4239 if (align_loops <= 0) align_loops = 1;
4240 if (align_loops_max_skip > align_loops || !align_loops)
4241 align_loops_max_skip = align_loops - 1;
4242 align_loops_log = floor_log2 (align_loops * 2 - 1);
4243 if (align_jumps <= 0) align_jumps = 1;
4244 if (align_jumps_max_skip > align_jumps || !align_jumps)
4245 align_jumps_max_skip = align_jumps - 1;
4246 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4247 if (align_labels <= 0) align_labels = 1;
4248 align_labels_log = floor_log2 (align_labels * 2 - 1);
4249 if (align_labels_max_skip > align_labels || !align_labels)
4250 align_labels_max_skip = align_labels - 1;
4251 if (align_functions <= 0) align_functions = 1;
4252 align_functions_log = floor_log2 (align_functions * 2 - 1);
4254 /* Unrolling all loops implies that standard loop unrolling must also
4256 if (flag_unroll_all_loops)
4257 flag_unroll_loops = 1;
4259 if (flag_unroll_loops)
4261 flag_old_unroll_loops = 0;
4262 flag_old_unroll_all_loops = 0;
4265 if (flag_old_unroll_all_loops)
4266 flag_old_unroll_loops = 1;
4268 /* Old loop unrolling requires that strength_reduction be on also. Silently
4269 turn on strength reduction here if it isn't already on. Also, the loop
4270 unrolling code assumes that cse will be run after loop, so that must
4271 be turned on also. */
4272 if (flag_old_unroll_loops)
4274 flag_strength_reduce = 1;
4275 flag_rerun_cse_after_loop = 1;
4277 if (flag_unroll_loops || flag_peel_loops)
4278 flag_rerun_cse_after_loop = 1;
4280 if (flag_non_call_exceptions)
4281 flag_asynchronous_unwind_tables = 1;
4282 if (flag_asynchronous_unwind_tables)
4283 flag_unwind_tables = 1;
4285 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4287 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4288 flag_unit_at_a_time = 0;
4290 if (flag_value_profile_transformations)
4291 flag_profile_values = 1;
4293 /* Warn about options that are not supported on this machine. */
4294 #ifndef INSN_SCHEDULING
4295 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4296 warning ("instruction scheduling not supported on this target machine");
4299 if (flag_delayed_branch)
4300 warning ("this target machine does not have delayed branches");
4303 user_label_prefix = USER_LABEL_PREFIX;
4304 if (flag_leading_underscore != -1)
4306 /* If the default prefix is more complicated than "" or "_",
4307 issue a warning and ignore this option. */
4308 if (user_label_prefix[0] == 0 ||
4309 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4311 user_label_prefix = flag_leading_underscore ? "_" : "";
4314 warning ("-f%sleading-underscore not supported on this target machine",
4315 flag_leading_underscore ? "" : "no-");
4318 /* If we are in verbose mode, write out the version and maybe all the
4319 option flags in use. */
4322 print_version (stderr, "");
4324 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4327 if (flag_syntax_only)
4329 write_symbols = NO_DEBUG;
4333 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4335 if (debug_info_level == DINFO_LEVEL_NONE)
4336 write_symbols = NO_DEBUG;
4338 /* Now we know write_symbols, set up the debug hooks based on it.
4339 By default we do nothing for debug output. */
4340 if (write_symbols == NO_DEBUG)
4341 debug_hooks = &do_nothing_debug_hooks;
4342 #if defined(DBX_DEBUGGING_INFO)
4343 else if (write_symbols == DBX_DEBUG)
4344 debug_hooks = &dbx_debug_hooks;
4346 #if defined(XCOFF_DEBUGGING_INFO)
4347 else if (write_symbols == XCOFF_DEBUG)
4348 debug_hooks = &xcoff_debug_hooks;
4350 #ifdef SDB_DEBUGGING_INFO
4351 else if (write_symbols == SDB_DEBUG)
4352 debug_hooks = &sdb_debug_hooks;
4354 #ifdef DWARF2_DEBUGGING_INFO
4355 else if (write_symbols == DWARF2_DEBUG)
4356 debug_hooks = &dwarf2_debug_hooks;
4358 #ifdef VMS_DEBUGGING_INFO
4359 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4360 debug_hooks = &vmsdbg_debug_hooks;
4363 error ("target system does not support the \"%s\" debug format",
4364 debug_type_names[write_symbols]);
4366 /* If auxiliary info generation is desired, open the output file.
4367 This goes in the same directory as the source file--unlike
4368 all the other output files. */
4369 if (flag_gen_aux_info)
4371 aux_info_file = fopen (aux_info_file_name, "w");
4372 if (aux_info_file == 0)
4373 fatal_error ("can't open %s: %m", aux_info_file_name);
4376 if (! targetm.have_named_sections)
4378 if (flag_function_sections)
4380 warning ("-ffunction-sections not supported for this target");
4381 flag_function_sections = 0;
4383 if (flag_data_sections)
4385 warning ("-fdata-sections not supported for this target");
4386 flag_data_sections = 0;
4390 if (flag_function_sections && profile_flag)
4392 warning ("-ffunction-sections disabled; it makes profiling impossible");
4393 flag_function_sections = 0;
4396 #ifndef HAVE_prefetch
4397 if (flag_prefetch_loop_arrays)
4399 warning ("-fprefetch-loop-arrays not supported for this target");
4400 flag_prefetch_loop_arrays = 0;
4403 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4405 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4406 flag_prefetch_loop_arrays = 0;
4410 /* This combination of options isn't handled for i386 targets and doesn't
4411 make much sense anyway, so don't allow it. */
4412 if (flag_prefetch_loop_arrays && optimize_size)
4414 warning ("-fprefetch-loop-arrays is not supported with -Os");
4415 flag_prefetch_loop_arrays = 0;
4418 #ifndef OBJECT_FORMAT_ELF
4419 if (flag_function_sections && write_symbols != NO_DEBUG)
4420 warning ("-ffunction-sections may affect debugging on some targets");
4423 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4424 if (flag_signaling_nans)
4425 flag_trapping_math = 1;
4428 /* Initialize the compiler back end. */
4432 init_adjust_machine_modes ();
4434 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4435 || debug_info_level == DINFO_LEVEL_VERBOSE
4436 #ifdef VMS_DEBUGGING_INFO
4437 /* Enable line number info for traceback. */
4438 || debug_info_level > DINFO_LEVEL_NONE
4440 || flag_test_coverage
4441 || warn_notreached);
4444 init_fake_stack_mems ();
4448 init_function_once ();
4449 init_varasm_once ();
4451 /* The following initialization functions need to generate rtl, so
4452 provide a dummy function context for them. */
4453 init_dummy_function_start ();
4455 if (flag_caller_saves)
4456 init_caller_save ();
4457 expand_dummy_function_end ();
4460 /* Language-dependent initialization. Returns nonzero on success. */
4462 lang_dependent_init (const char *name)
4464 if (dump_base_name == 0)
4465 dump_base_name = name ? name : "gccdump";
4467 /* Other front-end initialization. */
4468 if ((*lang_hooks.init) () == 0)
4471 init_asm_output (name);
4473 /* These create various _DECL nodes, so need to be called after the
4474 front end is initialized. */
4478 /* The following initialization functions need to generate rtl, so
4479 provide a dummy function context for them. */
4480 init_dummy_function_start ();
4482 expand_dummy_function_end ();
4484 /* If dbx symbol table desired, initialize writing it and output the
4485 predefined types. */
4486 timevar_push (TV_SYMOUT);
4488 #ifdef DWARF2_UNWIND_INFO
4489 if (dwarf2out_do_frame ())
4490 dwarf2out_frame_init ();
4493 /* Now we have the correct original filename, we can initialize
4495 (*debug_hooks->init) (name);
4497 timevar_pop (TV_SYMOUT);
4502 /* Clean up: close opened files, etc. */
4507 /* Close the dump files. */
4508 if (flag_gen_aux_info)
4510 fclose (aux_info_file);
4512 unlink (aux_info_file_name);
4515 /* Close non-debugging input and output files. Take special care to note
4516 whether fclose returns an error, since the pages might still be on the
4517 buffer chain while the file is open. */
4521 if (ferror (asm_out_file) != 0)
4522 fatal_error ("error writing to %s: %m", asm_file_name);
4523 if (fclose (asm_out_file) != 0)
4524 fatal_error ("error closing %s: %m", asm_file_name);
4527 /* Do whatever is necessary to finish printing the graphs. */
4528 if (graph_dump_format != no_graph)
4532 for (i = 0; i < (int) DFI_MAX; ++i)
4533 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4538 sprintf (seq, DUMPFILE_FORMAT, i);
4539 suffix = concat (seq, dump_file[i].extension, NULL);
4540 finish_graph_dump_file (dump_base_name, suffix);
4547 ggc_print_statistics ();
4548 stringpool_statistics ();
4549 dump_tree_statistics ();
4550 dump_rtx_statistics ();
4553 /* Free up memory for the benefit of leak detectors. */
4556 /* Language-specific end of compilation actions. */
4557 (*lang_hooks.finish) ();
4560 /* Initialize the compiler, and compile the input file. */
4564 /* Initialize timing first. The C front ends read the main file in
4565 the post_options hook, and C++ does file timings. */
4566 if (time_report || !quiet_flag || flag_detailed_statistics)
4568 timevar_start (TV_TOTAL);
4572 /* Don't do any more if an error has already occurred. */
4575 /* Set up the back-end if requested. */
4579 /* Language-dependent initialization. Returns true on success. */
4580 if (lang_dependent_init (main_input_filename))
4582 if (flag_unit_at_a_time)
4584 open_dump_file (DFI_cgraph, NULL);
4585 cgraph_dump_file = rtl_dump_file;
4586 rtl_dump_file = NULL;
4591 if (flag_unit_at_a_time)
4593 rtl_dump_file = cgraph_dump_file;
4594 cgraph_dump_file = NULL;
4595 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4602 /* Stop timing and print the times. */
4603 timevar_stop (TV_TOTAL);
4604 timevar_print (stderr);
4607 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4608 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4609 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4611 It is not safe to call this function more than once. */
4614 toplev_main (unsigned int argc, const char **argv)
4618 /* Initialization of GCC's environment, and diagnostics. */
4619 general_init (argv[0]);
4621 /* Parse the options and do minimal processing; basically just
4622 enough to default flags appropriately. */
4623 decode_options (argc, argv);
4627 /* Exit early if we can (e.g. -help). */
4628 if (!exit_after_options)
4631 if (errorcount || sorrycount)
4632 return (FATAL_EXIT_CODE);
4634 return (SUCCESS_EXIT_CODE);