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"
81 #include "alloc-pool.h"
83 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
84 #include "dwarf2out.h"
87 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
91 #ifdef SDB_DEBUGGING_INFO
95 #ifdef XCOFF_DEBUGGING_INFO
96 #include "xcoffout.h" /* Needed for external data
97 declarations for e.g. AIX 4.x. */
100 #ifndef HAVE_conditional_execution
101 #define HAVE_conditional_execution 0
104 /* Carry information from ASM_DECLARE_OBJECT_NAME
105 to ASM_FINISH_DECLARE_OBJECT. */
107 extern int size_directive_output;
108 extern tree last_assemble_variable_decl;
110 extern void reg_alloc (void);
112 static void general_init (const char *);
113 static void do_compile (void);
114 static void process_options (void);
115 static void backend_init (void);
116 static int lang_dependent_init (const char *);
117 static void init_asm_output (const char *);
118 static void finalize (void);
120 static void crash_signal (int) ATTRIBUTE_NORETURN;
121 static void setup_core_dumping (void);
122 static void compile_file (void);
124 static int print_single_switch (FILE *, int, int, const char *,
125 const char *, const char *,
126 const char *, const char *);
127 static void print_switch_values (FILE *, int, int, const char *,
128 const char *, const char *);
130 /* Rest of compilation helper functions. */
131 static bool rest_of_handle_inlining (tree);
132 static void rest_of_handle_cse (tree, rtx);
133 static void rest_of_handle_cse2 (tree, rtx);
134 static void rest_of_handle_gcse (tree, rtx);
135 static void rest_of_handle_life (tree, rtx);
136 static void rest_of_handle_loop_optimize (tree, rtx);
137 static void rest_of_handle_loop2 (tree, rtx);
138 static void rest_of_handle_jump_bypass (tree, rtx);
139 static void rest_of_handle_sibling_calls (rtx);
140 static void rest_of_handle_null_pointer (tree, rtx);
141 static void rest_of_handle_addressof (tree, rtx);
142 static void rest_of_handle_cfg (tree, rtx);
143 static void rest_of_handle_branch_prob (tree, rtx);
144 static void rest_of_handle_value_profile_transformations (tree, rtx);
145 static void rest_of_handle_if_conversion (tree, rtx);
146 static void rest_of_handle_if_after_combine (tree, rtx);
147 static void rest_of_handle_tracer (tree, rtx);
148 static void rest_of_handle_combine (tree, rtx);
149 static void rest_of_handle_regmove (tree, rtx);
150 #ifdef INSN_SCHEDULING
151 static void rest_of_handle_sched (tree, rtx);
152 static void rest_of_handle_sched2 (tree, rtx);
154 static bool rest_of_handle_new_regalloc (tree, rtx);
155 static bool rest_of_handle_old_regalloc (tree, rtx);
156 static void rest_of_handle_regrename (tree, rtx);
157 static void rest_of_handle_reorder_blocks (tree, rtx);
159 static void rest_of_handle_stack_regs (tree, rtx);
161 static void rest_of_handle_machine_reorg (tree, rtx);
163 static void rest_of_handle_delay_slots (tree, rtx);
165 static void rest_of_handle_final (tree, rtx);
167 /* Nonzero to dump debug info whilst parsing (-dy option). */
168 static int set_yydebug;
170 /* True if we don't need a backend (e.g. preprocessing only). */
171 static bool no_backend;
173 /* Length of line when printing switch values. */
176 /* Name of program invoked, sans directories. */
178 const char *progname;
180 /* Copy of argument vector to toplev_main. */
181 static const char **save_argv;
183 /* Name of top-level original source file (what was input to cpp).
184 This comes from the #-command at the beginning of the actual input.
185 If there isn't any there, then this is the cc1 input file name. */
187 const char *main_input_filename;
189 /* Current position in real source file. */
191 location_t input_location;
193 /* Nonzero if it is unsafe to create any new pseudo registers. */
196 /* Stack of currently pending input files. */
198 struct file_stack *input_file_stack;
200 /* Incremented on each change to input_file_stack. */
201 int input_file_stack_tick;
203 /* Name to use as base of names for dump output files. */
205 const char *dump_base_name;
207 /* Name to use as a base for auxiliary output files. */
209 const char *aux_base_name;
211 /* Format to use to print dumpfile index value */
212 #ifndef DUMPFILE_FORMAT
213 #define DUMPFILE_FORMAT ".%02d."
216 /* Bit flags that specify the machine subtype we are compiling for.
217 Bits are tested using macros TARGET_... defined in the tm.h file
218 and set by `-m...' switches. Must be defined in rtlanal.c. */
220 extern int target_flags;
222 /* A mask of target_flags that includes bit X if X was set or cleared
223 on the command line. */
225 int target_flags_explicit;
227 /* Debug hooks - dependent upon command line options. */
229 const struct gcc_debug_hooks *debug_hooks;
231 /* Describes a dump file. */
233 struct dump_file_info
235 /* The unique extension to apply, e.g. ".jump". */
236 const char *const extension;
238 /* The -d<c> character that enables this dump file. */
239 char const debug_switch;
241 /* True if there is a corresponding graph dump file. */
242 char const graph_dump_p;
244 /* True if the user selected this dump. */
247 /* True if the files have been initialized (ie truncated). */
251 /* Enumerate the extant dump files. */
287 DFI_branch_target_load,
295 /* Describes all the dump files. Should be kept in order of the
296 pass and in sync with dump_file_index above.
298 Remaining -d letters:
304 static struct dump_file_info dump_file[DFI_MAX] =
306 { "cgraph", 'U', 0, 0, 0 },
307 { "rtl", 'r', 0, 0, 0 },
308 { "sibling", 'i', 0, 0, 0 },
309 { "eh", 'h', 0, 0, 0 },
310 { "jump", 'j', 0, 0, 0 },
311 { "null", 'u', 0, 0, 0 },
312 { "cse", 's', 0, 0, 0 },
313 { "addressof", 'F', 0, 0, 0 },
314 { "gcse", 'G', 1, 0, 0 },
315 { "loop", 'L', 1, 0, 0 },
316 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
317 { "cfg", 'f', 1, 0, 0 },
318 { "bp", 'b', 1, 0, 0 },
319 { "vpt", 'V', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "web", 'Z', 0, 0, 0 },
324 { "cse2", 't', 1, 0, 0 },
325 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
326 { "combine", 'c', 1, 0, 0 },
327 { "ce2", 'C', 1, 0, 0 },
328 { "regmove", 'N', 1, 0, 0 },
329 { "sched", 'S', 1, 0, 0 },
330 { "lreg", 'l', 1, 0, 0 },
331 { "greg", 'g', 1, 0, 0 },
332 { "postreload", 'o', 1, 0, 0 },
333 { "flow2", 'w', 1, 0, 0 },
334 { "peephole2", 'z', 1, 0, 0 },
335 { "ce3", 'E', 1, 0, 0 },
336 { "rnreg", 'n', 1, 0, 0 },
337 { "bbro", 'B', 1, 0, 0 },
338 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
339 { "sched2", 'R', 1, 0, 0 },
340 { "stack", 'k', 1, 0, 0 },
341 { "mach", 'M', 1, 0, 0 },
342 { "dbr", 'd', 0, 0, 0 },
345 static int open_dump_file (enum dump_file_index, tree);
346 static void close_dump_file (enum dump_file_index,
347 void (*) (FILE *, rtx), rtx);
349 /* Other flags saying which kinds of debugging dump have been requested. */
351 int rtl_dump_and_exit;
352 int flag_print_asm_name;
353 enum graph_dump_types graph_dump_format;
355 /* Name for output file of assembly code, specified with -o. */
357 const char *asm_file_name;
359 /* Nonzero means do optimizations. -O.
360 Particular numeric values stand for particular amounts of optimization;
361 thus, -O2 stores 2 here. However, the optimizations beyond the basic
362 ones are not controlled directly by this variable. Instead, they are
363 controlled by individual `flag_...' variables that are defaulted
364 based on this variable. */
368 /* Nonzero means optimize for size. -Os.
369 The only valid values are zero and nonzero. When optimize_size is
370 nonzero, optimize defaults to 2, but certain individual code
371 bloating optimizations are disabled. */
373 int optimize_size = 0;
375 /* The FUNCTION_DECL for the function currently being compiled,
376 or 0 if between functions. */
377 tree current_function_decl;
379 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
381 tree current_function_func_begin_label;
383 /* Nonzero if doing dwarf2 duplicate elimination. */
385 int flag_eliminate_dwarf2_dups = 0;
387 /* Nonzero if doing unused type elimination. */
389 int flag_eliminate_unused_debug_types = 1;
391 /* Nonzero means emit debugging information only for symbols which are used. */
392 int flag_debug_only_used_symbols = 0;
394 /* Nonzero if generating code to do profiling. */
396 int profile_flag = 0;
398 /* Nonzero if generating code to profile program flow graph arcs. */
400 int profile_arc_flag = 0;
402 /* Nonzero if value histograms should be measured. */
404 int flag_profile_values = 0;
406 /* Nonzero if value histograms should be used to optimize code. */
407 int flag_value_profile_transformations = 0;
409 /* Nonzero if generating info for gcov to calculate line test coverage. */
411 int flag_test_coverage = 0;
413 /* Nonzero indicates that branch taken probabilities should be calculated. */
415 int flag_branch_probabilities = 0;
417 /* Nonzero if basic blocks should be reordered. */
419 int flag_reorder_blocks = 0;
421 /* Nonzero if functions should be reordered. */
423 int flag_reorder_functions = 0;
425 /* Nonzero if registers should be renamed. */
427 int flag_rename_registers = 0;
428 int flag_cprop_registers = 0;
430 /* Nonzero for -pedantic switch: warn about anything
431 that standard spec forbids. */
435 /* Temporarily suppress certain warnings.
436 This is set while reading code from a system header file. */
438 int in_system_header = 0;
440 /* Don't print functions as they are compiled. -quiet. */
444 /* Print times taken by the various passes. -ftime-report. */
448 /* Print memory still in use at end of compilation (which may have little
449 to do with peak memory consumption). -fmem-report. */
453 /* Nonzero means to collect statistics which might be expensive
454 and to print them when we are done. */
455 int flag_detailed_statistics = 0;
457 /* A random sequence of characters, unless overridden by user. */
458 const char *flag_random_seed;
460 /* A local time stamp derived from the time of compilation. It will be
461 zero if the system cannot provide a time. It will be -1u, if the
462 user has specified a particular random seed. */
467 /* Nonzero means `char' should be signed. */
469 int flag_signed_char;
471 /* Nonzero means give an enum type only as many bytes as it needs. */
473 int flag_short_enums;
475 /* Nonzero for -fcaller-saves: allocate values in regs that need to
476 be saved across function calls, if that produces overall better code.
477 Optional now, so people can test it. */
479 int flag_caller_saves = 0;
481 /* Nonzero if structures and unions should be returned in memory.
483 This should only be defined if compatibility with another compiler or
484 with an ABI is needed, because it results in slower code. */
486 #ifndef DEFAULT_PCC_STRUCT_RETURN
487 #define DEFAULT_PCC_STRUCT_RETURN 1
490 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
492 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
494 /* Nonzero for -fforce-mem: load memory value into a register
495 before arithmetic on it. This makes better cse but slower compilation. */
497 int flag_force_mem = 0;
499 /* Nonzero for -fforce-addr: load memory address into a register before
500 reference to memory. This makes better cse but slower compilation. */
502 int flag_force_addr = 0;
504 /* Nonzero for -fdefer-pop: don't pop args after each function call;
505 instead save them up to pop many calls' args with one insns. */
507 int flag_defer_pop = 0;
509 /* Nonzero for -ffloat-store: don't allocate floats and doubles
510 in extended-precision registers. */
512 int flag_float_store = 0;
514 /* Nonzero for -fcse-follow-jumps:
515 have cse follow jumps to do a more extensive job. */
517 int flag_cse_follow_jumps;
519 /* Nonzero for -fcse-skip-blocks:
520 have cse follow a branch around a block. */
521 int flag_cse_skip_blocks;
523 /* Nonzero for -fexpensive-optimizations:
524 perform miscellaneous relatively-expensive optimizations. */
525 int flag_expensive_optimizations;
527 /* Nonzero for -fthread-jumps:
528 have jump optimize output of loop. */
530 int flag_thread_jumps;
532 /* Nonzero enables strength-reduction in loop.c. */
534 int flag_strength_reduce = 0;
536 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
537 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
538 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
541 int flag_old_unroll_loops;
543 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
544 This is generally not a win. */
546 int flag_old_unroll_all_loops;
548 /* Enables unrolling of simple loops in loop-unroll.c. */
549 int flag_unroll_loops;
551 /* Enables unrolling of all loops in loop-unroll.c. */
552 int flag_unroll_all_loops;
554 /* Nonzero enables loop peeling. */
557 /* Nonzero enables loop unswitching. */
558 int flag_unswitch_loops;
560 /* Nonzero enables prefetch optimizations for arrays in loops. */
562 int flag_prefetch_loop_arrays;
564 /* Nonzero forces all invariant computations in loops to be moved
567 int flag_move_all_movables = 0;
569 /* Nonzero forces all general induction variables in loops to be
572 int flag_reduce_all_givs = 0;
574 /* Nonzero to perform full register move optimization passes. This is the
577 int flag_regmove = 0;
579 /* Nonzero for -fwritable-strings:
580 store string constants in data segment and don't uniquize them. */
582 int flag_writable_strings = 0;
584 /* Nonzero means don't put addresses of constant functions in registers.
585 Used for compiling the Unix kernel, where strange substitutions are
586 done on the assembly output. */
588 int flag_no_function_cse = 0;
590 /* Nonzero for -fomit-frame-pointer:
591 don't make a frame pointer in simple functions that don't require one. */
593 int flag_omit_frame_pointer = 0;
595 /* Nonzero means place each function into its own section on those platforms
596 which support arbitrary section names and unlimited numbers of sections. */
598 int flag_function_sections = 0;
600 /* ... and similar for data. */
602 int flag_data_sections = 0;
604 /* Nonzero to inhibit use of define_optimization peephole opts. */
606 int flag_no_peephole = 0;
608 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
610 int flag_optimize_sibling_calls = 0;
612 /* Nonzero means the front end generally wants `errno' maintained by math
613 operations, like built-in SQRT. */
615 int flag_errno_math = 1;
617 /* Nonzero means that unsafe floating-point math optimizations are allowed
618 for the sake of speed. IEEE compliance is not guaranteed, and operations
619 are allowed to assume that their arguments and results are "normal"
620 (e.g., nonnegative for SQRT). */
622 int flag_unsafe_math_optimizations = 0;
624 /* Nonzero means that no NaNs or +-Infs are expected. */
626 int flag_finite_math_only = 0;
628 /* Zero means that floating-point math operations cannot generate a
629 (user-visible) trap. This is the case, for example, in nonstop
630 IEEE 754 arithmetic. Trapping conditions include division by zero,
631 overflow, underflow, invalid and inexact, but does not include
632 operations on signaling NaNs (see below). */
634 int flag_trapping_math = 1;
636 /* Nonzero means disable transformations that assume default floating
637 point rounding behavior. */
639 int flag_rounding_math = 0;
641 /* Nonzero means disable transformations observable by signaling NaNs.
642 This option implies that any operation on an IEEE signaling NaN can
643 generate a (user-visible) trap. */
645 int flag_signaling_nans = 0;
647 /* 0 means straightforward implementation of complex divide acceptable.
648 1 means wide ranges of inputs must work for complex divide.
649 2 means C99-like requirements for complex divide (not yet implemented). */
651 int flag_complex_divide_method = 0;
653 /* Nonzero means just do syntax checking; don't output anything. */
655 int flag_syntax_only = 0;
657 /* Nonzero means performs web construction pass. */
661 /* Nonzero means perform loop optimizer. */
663 int flag_loop_optimize;
665 /* Nonzero means perform crossjumping. */
667 int flag_crossjumping;
669 /* Nonzero means perform if conversion. */
671 int flag_if_conversion;
673 /* Nonzero means perform if conversion after reload. */
675 int flag_if_conversion2;
677 /* Nonzero means to use global dataflow analysis to eliminate
678 useless null pointer tests. */
680 int flag_delete_null_pointer_checks;
682 /* Nonzero means perform global CSE. */
686 /* Nonzero means to do the enhanced load motion during gcse, which trys
687 to hoist loads by not killing them when a store to the same location
690 int flag_gcse_lm = 1;
692 /* Nonzero means to perform store motion after gcse, which will try to
693 move stores closer to the exit block. Its not very effective without
696 int flag_gcse_sm = 1;
698 /* Nonzero if we want to perfrom redundant load after store elimination
701 int flag_gcse_las = 1;
703 /* Perform target register optimization before prologue / epilogue
706 int flag_branch_target_load_optimize = 0;
708 /* Perform target register optimization after prologue / epilogue
709 threading and jump2. */
711 int flag_branch_target_load_optimize2 = 0;
713 /* Nonzero means to rerun cse after loop optimization. This increases
714 compilation time about 20% and picks up a few more common expressions. */
716 int flag_rerun_cse_after_loop;
718 /* Nonzero means to run loop optimizations twice. */
720 int flag_rerun_loop_opt;
722 /* Nonzero for -finline-functions: ok to inline functions that look like
723 good inline candidates. */
725 int flag_inline_functions;
727 /* Nonzero for -fkeep-inline-functions: even if we make a function
728 go inline everywhere, keep its definition around for debugging
731 int flag_keep_inline_functions;
733 /* Nonzero means that functions will not be inlined. */
735 int flag_no_inline = 2;
737 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
738 not just because the tree inliner turned us off. */
740 int flag_really_no_inline = 2;
742 /* Nonzero means that we should emit static const variables
743 regardless of whether or not optimization is turned on. */
745 int flag_keep_static_consts = 1;
747 /* Nonzero means we should be saving declaration info into a .X file. */
749 int flag_gen_aux_info = 0;
751 /* Specified name of aux-info file. */
753 const char *aux_info_file_name;
755 /* Nonzero means make the text shared if supported. */
757 int flag_shared_data;
759 /* Nonzero means schedule into delayed branch slots if supported. */
761 int flag_delayed_branch;
763 /* Nonzero if we are compiling pure (sharable) code.
764 Value is 1 if we are doing "small" pic; value is 2 if we're doing
769 /* Nonzero if we are compiling position independent code for executable.
770 The value is 1 if we are doing "small" pic; value is 2 if we're doing
775 /* Nonzero if we are compiling code for a shared library, zero for
780 /* Set to the default thread-local storage (tls) model to use. */
782 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
784 /* Nonzero means generate extra code for exception handling and enable
785 exception handling. */
789 /* Nonzero means generate frame unwind info table when supported. */
791 int flag_unwind_tables = 0;
793 /* Nonzero means generate frame unwind info table exact at each insn
796 int flag_asynchronous_unwind_tables = 0;
798 /* Nonzero means don't place uninitialized global data in common storage
803 /* Nonzero means change certain warnings into errors.
804 Usually these are warnings about failure to conform to some standard. */
806 int flag_pedantic_errors = 0;
808 /* flag_schedule_insns means schedule insns within basic blocks (before
810 flag_schedule_insns_after_reload means schedule insns after
813 int flag_schedule_insns = 0;
814 int flag_schedule_insns_after_reload = 0;
816 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
817 int flag_sched2_use_superblocks = 0;
819 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
821 int flag_sched2_use_traces = 0;
823 /* The following flags have effect only for scheduling before register
826 flag_schedule_interblock means schedule insns across basic blocks.
827 flag_schedule_speculative means allow speculative motion of non-load insns.
828 flag_schedule_speculative_load means allow speculative motion of some
830 flag_schedule_speculative_load_dangerous allows speculative motion of more
833 int flag_schedule_interblock = 1;
834 int flag_schedule_speculative = 1;
835 int flag_schedule_speculative_load = 0;
836 int flag_schedule_speculative_load_dangerous = 0;
838 /* The following flags have an effect during scheduling after register
841 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
842 of stalled insns into the ready list.
844 flag_sched_stalled_insns_dep controls how many insn groups will be examined
845 for a dependency on a stalled insn that is candidate for premature removal
846 from the queue of stalled insns into the ready list (has an effect only if
847 the flag 'sched_stalled_insns' is set). */
849 int flag_sched_stalled_insns = 0;
850 int flag_sched_stalled_insns_dep = 1;
852 int flag_single_precision_constant;
854 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
855 by a cheaper branch on a count register. */
856 int flag_branch_on_count_reg = 1;
858 /* -finhibit-size-directive inhibits output of .size for ELF.
859 This is used only for compiling crtstuff.c,
860 and it may be extended to other effects
861 needed for crtstuff.c on other systems. */
862 int flag_inhibit_size_directive = 0;
864 /* -fverbose-asm causes extra commentary information to be produced in
865 the generated assembly code (to make it more readable). This option
866 is generally only of use to those who actually need to read the
867 generated assembly code (perhaps while debugging the compiler itself).
868 -fno-verbose-asm, the default, causes the extra information
869 to be omitted and is useful when comparing two assembler files. */
871 int flag_verbose_asm = 0;
873 /* -dA causes debug commentary information to be produced in
874 the generated assembly code (to make it more readable). This option
875 is generally only of use to those who actually need to read the
876 generated assembly code (perhaps while debugging the compiler itself).
877 Currently, this switch is only used by dwarfout.c; however, it is intended
878 to be a catchall for printing debug information in the assembler file. */
880 int flag_debug_asm = 0;
882 /* -dP causes the rtl to be emitted as a comment in assembly. */
884 int flag_dump_rtl_in_asm = 0;
886 /* Nonzero means put zero initialized data in the bss section. */
887 int flag_zero_initialized_in_bss = 1;
889 /* Tag all structures with __attribute__(packed). */
890 int flag_pack_struct = 0;
892 /* Emit code to check for stack overflow; also may cause large objects
893 to be allocated dynamically. */
894 int flag_stack_check;
896 /* When non-NULL, indicates that whenever space is allocated on the
897 stack, the resulting stack pointer must not pass this
898 address---that is, for stacks that grow downward, the stack pointer
899 must always be greater than or equal to this address; for stacks
900 that grow upward, the stack pointer must be less than this address.
901 At present, the rtx may be either a REG or a SYMBOL_REF, although
902 the support provided depends on the backend. */
905 /* 0 if pointer arguments may alias each other. True in C.
906 1 if pointer arguments may not alias each other but may alias
908 2 if pointer arguments may not alias each other and may not
909 alias global variables. True in Fortran.
910 This defaults to 0 for C. */
911 int flag_argument_noalias = 0;
913 /* Nonzero if we should do (language-dependent) alias analysis.
914 Typically, this analysis will assume that expressions of certain
915 types do not alias expressions of certain other types. Only used
916 if alias analysis (in general) is enabled. */
917 int flag_strict_aliasing = 0;
919 /* Instrument functions with calls at entry and exit, for profiling. */
920 int flag_instrument_function_entry_exit = 0;
922 /* Nonzero means ignore `#ident' directives. 0 means handle them.
923 On SVR4 targets, it also controls whether or not to emit a
924 string identifying the compiler. */
926 int flag_no_ident = 0;
928 /* This will perform a peephole pass before sched2. */
929 int flag_peephole2 = 0;
931 /* This will try to guess branch probabilities. */
932 int flag_guess_branch_prob = 0;
934 /* -fcheck-bounds causes gcc to generate array bounds checks.
935 For C, C++, ObjC: defaults to off.
936 For Java: defaults to on.
937 For Fortran: defaults to off. */
938 int flag_bounds_check = 0;
940 /* This will attempt to merge constant section constants, if 1 only
941 string constants and constants from constant pool, if 2 also constant
943 int flag_merge_constants = 1;
945 /* If one, renumber instruction UIDs to reduce the number of
946 unused UIDs if there are a lot of instructions. If greater than
947 one, unconditionally renumber instruction UIDs. */
948 int flag_renumber_insns = 1;
950 /* If nonzero, use the graph coloring register allocator. */
951 int flag_new_regalloc = 0;
953 /* Nonzero if we perform superblock formation. */
957 /* Nonzero if we perform whole unit at a time compilation. */
959 int flag_unit_at_a_time = 0;
961 /* Values of the -falign-* flags: how much to align labels in code.
962 0 means `use default', 1 means `don't align'.
963 For each variable, there is an _log variant which is the power
964 of two not less than the variable, for .align output. */
968 int align_loops_max_skip;
971 int align_jumps_max_skip;
973 int align_labels_log;
974 int align_labels_max_skip;
976 int align_functions_log;
978 /* Like align_functions_log above, but used by front-ends to force the
979 minimum function alignment. Zero means no alignment is forced. */
980 int force_align_functions_log;
984 const char *const string;
988 lang_independent_options;
990 /* Nonzero if signed arithmetic overflow should trap. */
993 /* Nonzero if signed arithmetic overflow should wrap around. */
996 /* Nonzero if subexpressions must be evaluated from left-to-right. */
997 int flag_evaluation_order = 0;
999 /* Add or remove a leading underscore from user symbols. */
1000 int flag_leading_underscore = -1;
1002 /* The version of the C++ ABI in use. The following values are
1005 0: The version of the ABI believed most conformant with the
1006 C++ ABI specification. This ABI may change as bugs are
1007 discovered and fixed. Therefore, 0 will not necessarily
1008 indicate the same ABI in different versions of G++.
1010 1: The version of the ABI first used in G++ 3.2.
1012 2: The version of the ABI first used in G++ 3.4.
1014 Additional positive integers will be assigned as new versions of
1015 the ABI become the default version of the ABI. */
1017 int flag_abi_version = 2;
1019 /* The user symbol prefix after having resolved same. */
1020 const char *user_label_prefix;
1022 static const param_info lang_independent_params[] = {
1023 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1024 { OPTION, DEFAULT, HELP },
1025 #include "params.def"
1030 /* Table of language-independent -f options.
1031 STRING is the option name. VARIABLE is the address of the variable.
1032 ON_VALUE is the value to store in VARIABLE
1033 if `-fSTRING' is seen as an option.
1034 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1036 static const lang_independent_options f_options[] =
1038 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1039 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1040 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1041 {"float-store", &flag_float_store, 1 },
1042 {"defer-pop", &flag_defer_pop, 1 },
1043 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1044 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1045 {"tracer", &flag_tracer, 1 },
1046 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1047 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1048 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1049 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1050 {"thread-jumps", &flag_thread_jumps, 1 },
1051 {"strength-reduce", &flag_strength_reduce, 1 },
1052 {"unroll-loops", &flag_unroll_loops, 1 },
1053 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1054 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1055 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1056 {"peel-loops", &flag_peel_loops, 1 },
1057 {"unswitch-loops", &flag_unswitch_loops, 1 },
1058 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1059 {"move-all-movables", &flag_move_all_movables, 1 },
1060 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1061 {"writable-strings", &flag_writable_strings, 1 },
1062 {"peephole", &flag_no_peephole, 0 },
1063 {"force-mem", &flag_force_mem, 1 },
1064 {"force-addr", &flag_force_addr, 1 },
1065 {"function-cse", &flag_no_function_cse, 0 },
1066 {"inline-functions", &flag_inline_functions, 1 },
1067 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1068 {"inline", &flag_no_inline, 0 },
1069 {"keep-static-consts", &flag_keep_static_consts, 1 },
1070 {"syntax-only", &flag_syntax_only, 1 },
1071 {"shared-data", &flag_shared_data, 1 },
1072 {"caller-saves", &flag_caller_saves, 1 },
1073 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1074 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1075 {"delayed-branch", &flag_delayed_branch, 1 },
1076 {"web", &flag_web, 1},
1077 {"gcse", &flag_gcse, 1 },
1078 {"gcse-lm", &flag_gcse_lm, 1 },
1079 {"gcse-sm", &flag_gcse_sm, 1 },
1080 {"gcse-las", &flag_gcse_las, 1 },
1081 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1082 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1083 {"loop-optimize", &flag_loop_optimize, 1 },
1084 {"crossjumping", &flag_crossjumping, 1 },
1085 {"if-conversion", &flag_if_conversion, 1 },
1086 {"if-conversion2", &flag_if_conversion2, 1 },
1087 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1088 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1089 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1090 {"schedule-insns", &flag_schedule_insns, 1 },
1091 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1092 {"sched-interblock",&flag_schedule_interblock, 1 },
1093 {"sched-spec",&flag_schedule_speculative, 1 },
1094 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1095 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1096 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1097 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1098 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1099 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1100 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1101 {"pic", &flag_pic, 1 },
1102 {"PIC", &flag_pic, 2 },
1103 {"pie", &flag_pie, 1 },
1104 {"PIE", &flag_pie, 2 },
1105 {"exceptions", &flag_exceptions, 1 },
1106 {"unwind-tables", &flag_unwind_tables, 1 },
1107 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1108 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1109 {"profile-arcs", &profile_arc_flag, 1 },
1110 {"profile-values", &flag_profile_values, 1 },
1111 {"vpt", &flag_value_profile_transformations, 1 },
1112 {"test-coverage", &flag_test_coverage, 1 },
1113 {"branch-probabilities", &flag_branch_probabilities, 1 },
1114 {"profile", &profile_flag, 1 },
1115 {"reorder-blocks", &flag_reorder_blocks, 1 },
1116 {"reorder-functions", &flag_reorder_functions, 1 },
1117 {"rename-registers", &flag_rename_registers, 1 },
1118 {"cprop-registers", &flag_cprop_registers, 1 },
1119 {"common", &flag_no_common, 0 },
1120 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1121 {"function-sections", &flag_function_sections, 1 },
1122 {"data-sections", &flag_data_sections, 1 },
1123 {"verbose-asm", &flag_verbose_asm, 1 },
1124 {"regmove", &flag_regmove, 1 },
1125 {"optimize-register-move", &flag_regmove, 1 },
1126 {"pack-struct", &flag_pack_struct, 1 },
1127 {"stack-check", &flag_stack_check, 1 },
1128 {"argument-alias", &flag_argument_noalias, 0 },
1129 {"argument-noalias", &flag_argument_noalias, 1 },
1130 {"argument-noalias-global", &flag_argument_noalias, 2 },
1131 {"strict-aliasing", &flag_strict_aliasing, 1 },
1132 {"align-loops", &align_loops, 0 },
1133 {"align-jumps", &align_jumps, 0 },
1134 {"align-labels", &align_labels, 0 },
1135 {"align-functions", &align_functions, 0 },
1136 {"merge-constants", &flag_merge_constants, 1 },
1137 {"merge-all-constants", &flag_merge_constants, 2 },
1138 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1139 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1140 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1141 {"leading-underscore", &flag_leading_underscore, 1 },
1142 {"ident", &flag_no_ident, 0 },
1143 { "peephole2", &flag_peephole2, 1 },
1144 {"finite-math-only", &flag_finite_math_only, 1 },
1145 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1146 {"math-errno", &flag_errno_math, 1 },
1147 {"trapping-math", &flag_trapping_math, 1 },
1148 {"rounding-math", &flag_rounding_math, 1 },
1149 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1150 {"signaling-nans", &flag_signaling_nans, 1 },
1151 {"bounds-check", &flag_bounds_check, 1 },
1152 {"single-precision-constant", &flag_single_precision_constant, 1 },
1153 {"time-report", &time_report, 1 },
1154 {"mem-report", &mem_report, 1 },
1155 { "trapv", &flag_trapv, 1 },
1156 { "wrapv", &flag_wrapv, 1 },
1157 { "new-ra", &flag_new_regalloc, 1 }
1160 /* Here is a table, controlled by the tm.h file, listing each -m switch
1161 and which bits in `target_switches' it should set or clear.
1162 If VALUE is positive, it is bits to set.
1163 If VALUE is negative, -VALUE is bits to clear.
1164 (The sign bit is not used so there is no confusion.) */
1168 const char *const name;
1170 const char *const description;
1172 target_switches[] = TARGET_SWITCHES;
1174 /* This table is similar, but allows the switch to have a value. */
1176 #ifdef TARGET_OPTIONS
1179 const char *const prefix;
1180 const char **const variable;
1181 const char *const description;
1182 const char *const value;
1184 target_options[] = TARGET_OPTIONS;
1187 /* Nonzero means warn about function definitions that default the return type
1188 or that use a null return and have a return-type other than void. */
1190 int warn_return_type;
1192 /* Output files for assembler code (real compiler output)
1193 and debugging dumps. */
1196 FILE *aux_info_file;
1197 FILE *rtl_dump_file = NULL;
1198 FILE *cgraph_dump_file = NULL;
1200 /* The current working directory of a translation. It's generally the
1201 directory from which compilation was initiated, but a preprocessed
1202 file may specify the original directory in which it was
1205 static const char *src_pwd;
1207 /* Initialize src_pwd with the given string, and return true. If it
1208 was already initialized, return false. As a special case, it may
1209 be called with a NULL argument to test whether src_pwd has NOT been
1213 set_src_pwd (const char *pwd)
1218 src_pwd = xstrdup (pwd);
1222 /* Return the directory from which the translation unit was initiated,
1223 in case set_src_pwd() was not called before to assign it a
1230 src_pwd = getpwd ();
1235 /* Called when the start of a function definition is parsed,
1236 this function prints on stderr the name of the function. */
1238 announce_function (tree decl)
1242 if (rtl_dump_and_exit)
1243 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1245 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1247 pp_needs_newline (global_dc->printer) = true;
1248 diagnostic_set_last_function (global_dc);
1252 /* Set up a default flag_random_seed and local_tick, unless the user
1253 already specified one. */
1258 if (!flag_random_seed)
1260 unsigned HOST_WIDE_INT value;
1261 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1263 /* Get some more or less random data. */
1264 #ifdef HAVE_GETTIMEOFDAY
1268 gettimeofday (&tv, NULL);
1269 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1273 time_t now = time (NULL);
1275 if (now != (time_t)-1)
1276 local_tick = (unsigned) now;
1279 value = local_tick ^ getpid ();
1281 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1282 flag_random_seed = random_seed;
1284 else if (!local_tick)
1289 /* Decode the string P as an integral parameter.
1290 If the string is indeed an integer return its numeric value else
1291 issue an Invalid Option error for the option PNAME and return DEFVAL.
1292 If PNAME is zero just return DEFVAL, do not call error. */
1295 read_integral_parameter (const char *p, const char *pname, const int defval)
1297 const char *endp = p;
1301 if (ISDIGIT (*endp))
1310 error ("invalid option argument `%s'", pname);
1317 /* Return the logarithm of X, base 2, considering X unsigned,
1318 if X is a power of 2. Otherwise, returns -1.
1320 This should be used via the `exact_log2' macro. */
1323 exact_log2_wide (unsigned HOST_WIDE_INT x)
1326 /* Test for 0 or a power of 2. */
1327 if (x == 0 || x != (x & -x))
1329 while ((x >>= 1) != 0)
1334 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1335 If X is 0, return -1.
1337 This should be used via the floor_log2 macro. */
1340 floor_log2_wide (unsigned HOST_WIDE_INT x)
1349 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1350 into ICE messages, which is much more user friendly. In case the
1351 error printer crashes, reset the signal to prevent infinite recursion. */
1354 crash_signal (int signo)
1356 signal (signo, SIG_DFL);
1357 internal_error ("%s", strsignal (signo));
1360 /* Arrange to dump core on error. (The regular error message is still
1361 printed first, except in the case of abort().) */
1364 setup_core_dumping (void)
1367 signal (SIGABRT, SIG_DFL);
1369 #if defined(HAVE_SETRLIMIT)
1372 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1373 fatal_error ("getting core file size maximum limit: %m");
1374 rlim.rlim_cur = rlim.rlim_max;
1375 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1376 fatal_error ("setting core file size limit to maximum: %m");
1379 diagnostic_abort_on_error (global_dc);
1383 /* Strip off a legitimate source ending from the input string NAME of
1384 length LEN. Rather than having to know the names used by all of
1385 our front ends, we strip off an ending of a period followed by
1386 up to five characters. (Java uses ".class".) */
1389 strip_off_ending (char *name, int len)
1392 for (i = 2; i < 6 && len > i; i++)
1394 if (name[len - i] == '.')
1396 name[len - i] = '\0';
1402 /* Output a quoted string. */
1405 output_quoted_string (FILE *asm_file, const char *string)
1407 #ifdef OUTPUT_QUOTED_STRING
1408 OUTPUT_QUOTED_STRING (asm_file, string);
1412 putc ('\"', asm_file);
1413 while ((c = *string++) != 0)
1417 if (c == '\"' || c == '\\')
1418 putc ('\\', asm_file);
1422 fprintf (asm_file, "\\%03o", (unsigned char) c);
1424 putc ('\"', asm_file);
1428 /* Output a file name in the form wanted by System V. */
1431 output_file_directive (FILE *asm_file, const char *input_name)
1436 if (input_name == NULL)
1437 input_name = "<stdin>";
1439 len = strlen (input_name);
1440 na = input_name + len;
1442 /* NA gets INPUT_NAME sans directory names. */
1443 while (na > input_name)
1445 if (IS_DIR_SEPARATOR (na[-1]))
1450 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1451 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1453 fprintf (asm_file, "\t.file\t");
1454 output_quoted_string (asm_file, na);
1455 fputc ('\n', asm_file);
1459 /* Routine to open a dump file. Return true if the dump file is enabled. */
1462 open_dump_file (enum dump_file_index index, tree decl)
1465 const char *open_arg;
1468 if (! dump_file[index].enabled)
1471 timevar_push (TV_DUMP);
1472 if (rtl_dump_file != NULL)
1473 fclose (rtl_dump_file);
1475 sprintf (seq, DUMPFILE_FORMAT, index);
1477 if (! dump_file[index].initialized)
1479 /* If we've not initialized the files, do so now. */
1480 if (graph_dump_format != no_graph
1481 && dump_file[index].graph_dump_p)
1483 dump_name = concat (seq, dump_file[index].extension, NULL);
1484 clean_graph_dump_file (dump_base_name, dump_name);
1487 dump_file[index].initialized = 1;
1493 dump_name = concat (dump_base_name, seq,
1494 dump_file[index].extension, NULL);
1496 rtl_dump_file = fopen (dump_name, open_arg);
1497 if (rtl_dump_file == NULL)
1498 fatal_error ("can't open %s: %m", dump_name);
1503 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1504 (*lang_hooks.decl_printable_name) (decl, 2),
1505 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1507 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1508 ? " (unlikely executed)"
1511 timevar_pop (TV_DUMP);
1515 /* Routine to close a dump file. */
1518 close_dump_file (enum dump_file_index index,
1519 void (*func) (FILE *, rtx),
1522 if (! rtl_dump_file)
1525 timevar_push (TV_DUMP);
1527 && graph_dump_format != no_graph
1528 && dump_file[index].graph_dump_p)
1533 sprintf (seq, DUMPFILE_FORMAT, index);
1534 suffix = concat (seq, dump_file[index].extension, NULL);
1535 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1540 func (rtl_dump_file, insns);
1542 fflush (rtl_dump_file);
1543 fclose (rtl_dump_file);
1545 rtl_dump_file = NULL;
1546 timevar_pop (TV_DUMP);
1549 /* Do any final processing required for the declarations in VEC, of
1550 which there are LEN. We write out inline functions and variables
1551 that have been deferred until this point, but which are required.
1552 Returns nonzero if anything was put out. */
1555 wrapup_global_declarations (tree *vec, int len)
1560 int output_something = 0;
1562 for (i = 0; i < len; i++)
1566 /* We're not deferring this any longer. Assignment is
1567 conditional to avoid needlessly dirtying PCH pages. */
1568 if (DECL_DEFER_OUTPUT (decl) != 0)
1569 DECL_DEFER_OUTPUT (decl) = 0;
1571 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1572 (*lang_hooks.finish_incomplete_decl) (decl);
1575 /* Now emit any global variables or functions that we have been
1576 putting off. We need to loop in case one of the things emitted
1577 here references another one which comes earlier in the list. */
1581 for (i = 0; i < len; i++)
1585 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1588 /* Don't write out static consts, unless we still need them.
1590 We also keep static consts if not optimizing (for debugging),
1591 unless the user specified -fno-keep-static-consts.
1592 ??? They might be better written into the debug information.
1593 This is possible when using DWARF.
1595 A language processor that wants static constants to be always
1596 written out (even if it is not used) is responsible for
1597 calling rest_of_decl_compilation itself. E.g. the C front-end
1598 calls rest_of_decl_compilation from finish_decl.
1599 One motivation for this is that is conventional in some
1600 environments to write things like:
1601 static const char rcsid[] = "... version string ...";
1602 intending to force the string to be in the executable.
1604 A language processor that would prefer to have unneeded
1605 static constants "optimized away" would just defer writing
1606 them out until here. E.g. C++ does this, because static
1607 constants are often defined in header files.
1609 ??? A tempting alternative (for both C and C++) would be
1610 to force a constant to be written if and only if it is
1611 defined in a main file, as opposed to an include file. */
1613 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1617 if (flag_unit_at_a_time
1618 && cgraph_varpool_node (decl)->finalized)
1620 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1621 && (TREE_USED (decl)
1622 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1624 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1626 else if (DECL_COMDAT (decl))
1628 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1629 && (optimize || !flag_keep_static_consts
1630 || DECL_ARTIFICIAL (decl)))
1636 rest_of_decl_compilation (decl, NULL, 1, 1);
1640 if (TREE_CODE (decl) == FUNCTION_DECL
1641 && DECL_INITIAL (decl) != 0
1642 && DECL_SAVED_INSNS (decl) != 0
1643 && DECL_SAVED_INSNS (decl)->saved_for_inline
1644 && (flag_keep_inline_functions
1645 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1646 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1649 output_inline_function (decl);
1654 output_something = 1;
1658 return output_something;
1661 /* Issue appropriate warnings for the global declarations in VEC (of
1662 which there are LEN). Output debugging information for them. */
1665 check_global_declarations (tree *vec, int len)
1670 for (i = 0; i < len; i++)
1674 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1675 && ! TREE_ASM_WRITTEN (decl))
1676 /* Cancel the RTL for this decl so that, if debugging info
1677 output for global variables is still to come,
1678 this one will be omitted. */
1679 SET_DECL_RTL (decl, NULL_RTX);
1681 /* Warn about any function
1682 declared static but not defined.
1683 We don't warn about variables,
1684 because many programs have static variables
1685 that exist only to get some text into the object file. */
1686 if (TREE_CODE (decl) == FUNCTION_DECL
1687 && (warn_unused_function
1688 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1689 && DECL_INITIAL (decl) == 0
1690 && DECL_EXTERNAL (decl)
1691 && ! DECL_ARTIFICIAL (decl)
1692 && ! TREE_PUBLIC (decl))
1694 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1695 pedwarn ("%J'%F' used but never defined", decl, decl);
1697 warning ("%J'%F' declared `static' but never defined", decl, decl);
1698 /* This symbol is effectively an "extern" declaration now. */
1699 TREE_PUBLIC (decl) = 1;
1700 assemble_external (decl);
1703 /* Warn about static fns or vars defined but not used. */
1704 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1705 /* We don't warn about "static const" variables because the
1706 "rcs_id" idiom uses that construction. */
1707 || (warn_unused_variable
1708 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1709 && ! DECL_IN_SYSTEM_HEADER (decl)
1710 && ! TREE_USED (decl)
1711 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1712 to handle multiple external decls in different scopes. */
1713 && ! TREE_USED (DECL_NAME (decl))
1714 && ! DECL_EXTERNAL (decl)
1715 && ! TREE_PUBLIC (decl)
1716 /* A volatile variable might be used in some non-obvious way. */
1717 && ! TREE_THIS_VOLATILE (decl)
1718 /* Global register variables must be declared to reserve them. */
1719 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1720 /* Otherwise, ask the language. */
1721 && (*lang_hooks.decls.warn_unused_global) (decl))
1722 warning ("%J'%D' defined but not used", decl, decl);
1724 /* Avoid confusing the debug information machinery when there are
1726 if (errorcount == 0 && sorrycount == 0)
1728 timevar_push (TV_SYMOUT);
1729 (*debug_hooks->global_decl) (decl);
1730 timevar_pop (TV_SYMOUT);
1735 /* Warn about a use of an identifier which was marked deprecated. */
1737 warn_deprecated_use (tree node)
1739 if (node == 0 || !warn_deprecated_decl)
1743 warning ("`%s' is deprecated (declared at %s:%d)",
1744 IDENTIFIER_POINTER (DECL_NAME (node)),
1745 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1746 else if (TYPE_P (node))
1748 const char *what = NULL;
1749 tree decl = TYPE_STUB_DECL (node);
1751 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1752 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1753 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1754 && DECL_NAME (TYPE_NAME (node)))
1755 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1760 warning ("`%s' is deprecated (declared at %s:%d)", what,
1761 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1763 warning ("`%s' is deprecated", what);
1766 warning ("type is deprecated (declared at %s:%d)",
1767 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1769 warning ("type is deprecated");
1773 /* Save the current INPUT_LOCATION on the top entry in the
1774 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1775 INPUT_LOCATION accordingly. */
1778 push_srcloc (const char *file, int line)
1780 struct file_stack *fs;
1782 fs = xmalloc (sizeof (struct file_stack));
1783 fs->location = input_location;
1784 fs->next = input_file_stack;
1785 input_filename = file;
1787 input_file_stack = fs;
1788 input_file_stack_tick++;
1791 /* Pop the top entry off the stack of presently open source files.
1792 Restore the INPUT_LOCATION from the new topmost entry on the
1798 struct file_stack *fs;
1800 fs = input_file_stack;
1801 input_location = fs->location;
1802 input_file_stack = fs->next;
1804 input_file_stack_tick++;
1807 /* Compile an entire translation unit. Write a file of assembly
1808 output and various debugging dumps. */
1813 /* Initialize yet another pass. */
1815 init_final (main_input_filename);
1816 coverage_init (aux_base_name);
1818 timevar_push (TV_PARSE);
1820 /* Call the parser, which parses the entire file (calling
1821 rest_of_compilation for each function). */
1822 (*lang_hooks.parse_file) (set_yydebug);
1824 /* In case there were missing block closers,
1825 get us back to the global binding level. */
1826 (*lang_hooks.clear_binding_stack) ();
1828 /* Compilation is now finished except for writing
1829 what's left of the symbol table output. */
1830 timevar_pop (TV_PARSE);
1832 if (flag_syntax_only)
1835 (*lang_hooks.decls.final_write_globals)();
1837 cgraph_varpool_assemble_pending_decls ();
1839 /* This must occur after the loop to output deferred functions.
1840 Else the coverage initializer would not be emitted if all the
1841 functions in this compilation unit were deferred. */
1844 /* Write out any pending weak symbol declarations. */
1848 /* Do dbx symbols. */
1849 timevar_push (TV_SYMOUT);
1851 #ifdef DWARF2_UNWIND_INFO
1852 if (dwarf2out_do_frame ())
1853 dwarf2out_frame_finish ();
1856 (*debug_hooks->finish) (main_input_filename);
1857 timevar_pop (TV_SYMOUT);
1859 /* Output some stuff at end of file if nec. */
1861 dw2_output_indirect_constants ();
1863 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1865 timevar_push (TV_DUMP);
1866 open_dump_file (DFI_bp, NULL);
1870 close_dump_file (DFI_bp, NULL, NULL_RTX);
1871 timevar_pop (TV_DUMP);
1874 targetm.asm_out.file_end ();
1876 /* Attach a special .ident directive to the end of the file to identify
1877 the version of GCC which compiled this code. The format of the .ident
1878 string is patterned after the ones produced by native SVR4 compilers. */
1881 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1882 IDENT_ASM_OP, version_string);
1885 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1887 timevar_push (TV_DUMP);
1888 dump_combine_total_stats (rtl_dump_file);
1889 close_dump_file (DFI_combine, NULL, NULL_RTX);
1890 timevar_pop (TV_DUMP);
1894 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1895 and TYPE_DECL nodes.
1897 This does nothing for local (non-static) variables, unless the
1898 variable is a register variable with an ASMSPEC. In that case, or
1899 if the variable is not an automatic, it sets up the RTL and
1900 outputs any assembler code (label definition, storage allocation
1901 and initialization).
1903 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1904 the assembler symbol name to be used. TOP_LEVEL is nonzero
1905 if this declaration is not within a function. */
1908 rest_of_decl_compilation (tree decl,
1909 const char *asmspec,
1913 /* We deferred calling assemble_alias so that we could collect
1914 other attributes such as visibility. Emit the alias now. */
1917 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1920 alias = TREE_VALUE (TREE_VALUE (alias));
1921 alias = get_identifier (TREE_STRING_POINTER (alias));
1922 assemble_alias (decl, alias);
1926 /* Forward declarations for nested functions are not "external",
1927 but we need to treat them as if they were. */
1928 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1929 || TREE_CODE (decl) == FUNCTION_DECL)
1931 timevar_push (TV_VARCONST);
1934 make_decl_rtl (decl, asmspec);
1936 /* Don't output anything when a tentative file-scope definition
1937 is seen. But at end of compilation, do output code for them.
1939 We do output all variables when unit-at-a-time is active and rely on
1940 callgraph code to defer them except for forward declarations
1941 (see gcc.c-torture/compile/920624-1.c) */
1943 || !DECL_DEFER_OUTPUT (decl)
1944 || (flag_unit_at_a_time && DECL_INITIAL (decl)))
1945 && !DECL_EXTERNAL (decl))
1947 if (flag_unit_at_a_time && !cgraph_global_info_ready
1948 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1949 cgraph_varpool_finalize_decl (decl);
1951 assemble_variable (decl, top_level, at_end, 0);
1954 #ifdef ASM_FINISH_DECLARE_OBJECT
1955 if (decl == last_assemble_variable_decl)
1957 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1962 timevar_pop (TV_VARCONST);
1964 else if (DECL_REGISTER (decl) && asmspec != 0)
1966 if (decode_reg_name (asmspec) >= 0)
1968 SET_DECL_RTL (decl, NULL_RTX);
1969 make_decl_rtl (decl, asmspec);
1973 error ("invalid register name `%s' for register variable", asmspec);
1974 DECL_REGISTER (decl) = 0;
1979 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1980 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1981 && TREE_CODE (decl) == TYPE_DECL)
1983 timevar_push (TV_SYMOUT);
1984 dbxout_symbol (decl, 0);
1985 timevar_pop (TV_SYMOUT);
1988 #ifdef SDB_DEBUGGING_INFO
1989 else if (write_symbols == SDB_DEBUG && top_level
1990 && TREE_CODE (decl) == TYPE_DECL)
1992 timevar_push (TV_SYMOUT);
1993 sdbout_symbol (decl, 0);
1994 timevar_pop (TV_SYMOUT);
1997 #ifdef DWARF2_DEBUGGING_INFO
1998 else if ((write_symbols == DWARF2_DEBUG
1999 || write_symbols == VMS_AND_DWARF2_DEBUG)
2001 && TREE_CODE (decl) == TYPE_DECL)
2003 timevar_push (TV_SYMOUT);
2004 dwarf2out_decl (decl);
2005 timevar_pop (TV_SYMOUT);
2010 /* Called after finishing a record, union or enumeral type. */
2013 rest_of_type_compilation (
2014 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2015 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2019 tree type ATTRIBUTE_UNUSED,
2020 int toplev ATTRIBUTE_UNUSED
2024 /* Avoid confusing the debug information machinery when there are
2026 if (errorcount != 0 || sorrycount != 0)
2029 timevar_push (TV_SYMOUT);
2030 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2031 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2032 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2034 #ifdef SDB_DEBUGGING_INFO
2035 if (write_symbols == SDB_DEBUG)
2036 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2038 #ifdef DWARF2_DEBUGGING_INFO
2039 if ((write_symbols == DWARF2_DEBUG
2040 || write_symbols == VMS_AND_DWARF2_DEBUG)
2042 dwarf2out_decl (TYPE_STUB_DECL (type));
2044 timevar_pop (TV_SYMOUT);
2047 /* Turn the RTL into assembly. */
2049 rest_of_handle_final (tree decl, rtx insns)
2051 timevar_push (TV_FINAL);
2056 /* Get the function's name, as described by its RTL. This may be
2057 different from the DECL_NAME name used in the source file. */
2059 x = DECL_RTL (decl);
2060 if (GET_CODE (x) != MEM)
2063 if (GET_CODE (x) != SYMBOL_REF)
2065 fnname = XSTR (x, 0);
2067 assemble_start_function (decl, fnname);
2068 final_start_function (insns, asm_out_file, optimize);
2069 final (insns, asm_out_file, optimize, 0);
2070 final_end_function ();
2072 #ifdef IA64_UNWIND_INFO
2073 /* ??? The IA-64 ".handlerdata" directive must be issued before
2074 the ".endp" directive that closes the procedure descriptor. */
2075 output_function_exception_table ();
2078 assemble_end_function (decl, fnname);
2080 #ifndef IA64_UNWIND_INFO
2081 /* Otherwise, it feels unclean to switch sections in the middle. */
2082 output_function_exception_table ();
2086 fflush (asm_out_file);
2088 /* Release all memory allocated by flow. */
2089 free_basic_block_vars (0);
2091 /* Release all memory held by regsets now. */
2092 regset_release_memory ();
2094 timevar_pop (TV_FINAL);
2100 /* Run delay slot optimization. */
2102 rest_of_handle_delay_slots (tree decl, rtx insns)
2104 timevar_push (TV_DBR_SCHED);
2105 open_dump_file (DFI_dbr, decl);
2107 dbr_schedule (insns, rtl_dump_file);
2109 close_dump_file (DFI_dbr, print_rtl, insns);
2110 timevar_pop (TV_DBR_SCHED);
2117 /* Convert register usage from flat register file usage to a stack
2120 rest_of_handle_stack_regs (tree decl, rtx insns)
2122 #if defined (HAVE_ATTR_length)
2123 /* If flow2 creates new instructions which need splitting
2124 and scheduling after reload is not done, they might not be
2125 split until final which doesn't allow splitting
2126 if HAVE_ATTR_length. */
2127 #ifdef INSN_SCHEDULING
2128 if (optimize && !flag_schedule_insns_after_reload)
2133 timevar_push (TV_SHORTEN_BRANCH);
2134 split_all_insns (1);
2135 timevar_pop (TV_SHORTEN_BRANCH);
2139 timevar_push (TV_REG_STACK);
2140 open_dump_file (DFI_stack, decl);
2142 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2144 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2145 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2146 && flag_reorder_blocks)
2148 reorder_basic_blocks ();
2149 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2153 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2154 timevar_pop (TV_REG_STACK);
2161 /* Machine independent reorg pass. */
2163 rest_of_handle_machine_reorg (tree decl, rtx insns)
2165 timevar_push (TV_MACH_DEP);
2166 open_dump_file (DFI_mach, decl);
2168 (*targetm.machine_dependent_reorg) ();
2170 close_dump_file (DFI_mach, print_rtl, insns);
2171 timevar_pop (TV_MACH_DEP);
2177 /* Run new register allocator. Return TRUE if we must exit
2178 rest_of_compilation upon return. */
2180 rest_of_handle_new_regalloc (tree decl, rtx insns)
2184 delete_trivially_dead_insns (insns, max_reg_num ());
2187 timevar_pop (TV_LOCAL_ALLOC);
2188 if (dump_file[DFI_lreg].enabled)
2190 timevar_push (TV_DUMP);
2192 close_dump_file (DFI_lreg, NULL, NULL);
2193 timevar_pop (TV_DUMP);
2196 /* XXX clean up the whole mess to bring live info in shape again. */
2197 timevar_push (TV_GLOBAL_ALLOC);
2198 open_dump_file (DFI_greg, decl);
2200 build_insn_chain (insns);
2201 failure = reload (insns, 0);
2203 timevar_pop (TV_GLOBAL_ALLOC);
2205 if (dump_file[DFI_greg].enabled)
2207 timevar_push (TV_DUMP);
2209 dump_global_regs (rtl_dump_file);
2211 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2212 timevar_pop (TV_DUMP);
2218 reload_completed = 1;
2223 /* Run old register allocator. Return TRUE if we must exit
2224 rest_of_compilation upon return. */
2226 rest_of_handle_old_regalloc (tree decl, rtx insns)
2231 /* Allocate the reg_renumber array. */
2232 allocate_reg_info (max_regno, FALSE, TRUE);
2234 /* And the reg_equiv_memory_loc array. */
2235 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2237 allocate_initial_values (reg_equiv_memory_loc);
2239 regclass (insns, max_reg_num (), rtl_dump_file);
2240 rebuild_notes = local_alloc ();
2242 timevar_pop (TV_LOCAL_ALLOC);
2244 /* Local allocation may have turned an indirect jump into a direct
2245 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2249 timevar_push (TV_JUMP);
2251 rebuild_jump_labels (insns);
2252 purge_all_dead_edges (0);
2254 timevar_pop (TV_JUMP);
2257 if (dump_file[DFI_lreg].enabled)
2259 timevar_push (TV_DUMP);
2261 dump_flow_info (rtl_dump_file);
2262 dump_local_alloc (rtl_dump_file);
2264 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2265 timevar_pop (TV_DUMP);
2270 timevar_push (TV_GLOBAL_ALLOC);
2271 open_dump_file (DFI_greg, decl);
2273 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2274 pass fixing up any insns that are invalid. */
2277 failure = global_alloc (rtl_dump_file);
2280 build_insn_chain (insns);
2281 failure = reload (insns, 0);
2284 timevar_pop (TV_GLOBAL_ALLOC);
2286 if (dump_file[DFI_greg].enabled)
2288 timevar_push (TV_DUMP);
2290 dump_global_regs (rtl_dump_file);
2292 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2293 timevar_pop (TV_DUMP);
2299 /* Run the regrename and cprop passes. */
2301 rest_of_handle_regrename (tree decl, rtx insns)
2303 timevar_push (TV_RENAME_REGISTERS);
2304 open_dump_file (DFI_rnreg, decl);
2306 if (flag_rename_registers)
2307 regrename_optimize ();
2308 if (flag_cprop_registers)
2309 copyprop_hardreg_forward ();
2311 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2312 timevar_pop (TV_RENAME_REGISTERS);
2315 /* Reorder basic blocks. */
2317 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2320 open_dump_file (DFI_bbro, decl);
2322 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2323 splitting possibly introduced more crossjumping opportunities. */
2324 changed = cleanup_cfg (CLEANUP_EXPENSIVE
2325 | (!HAVE_conditional_execution
2326 ? CLEANUP_UPDATE_LIFE : 0));
2328 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2330 if (flag_reorder_blocks)
2331 reorder_basic_blocks ();
2332 if (flag_reorder_blocks
2333 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2334 changed |= cleanup_cfg (CLEANUP_EXPENSIVE
2335 | (!HAVE_conditional_execution
2336 ? CLEANUP_UPDATE_LIFE : 0));
2338 /* On conditional execution targets we can not update the life cheaply, so
2339 we deffer the updating to after both cleanups. This may lose some cases
2340 but should not be terribly bad. */
2341 if (changed && HAVE_conditional_execution)
2342 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2343 PROP_DEATH_NOTES | PROP_REG_INFO);
2344 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2347 #ifdef INSN_SCHEDULING
2348 /* Run instruction scheduler. */
2350 rest_of_handle_sched (tree decl, rtx insns)
2352 timevar_push (TV_SCHED);
2354 /* Print function header into sched dump now
2355 because doing the sched analysis makes some of the dump. */
2356 if (optimize > 0 && flag_schedule_insns)
2358 open_dump_file (DFI_sched, decl);
2360 /* Do control and data sched analysis,
2361 and write some of the results to dump file. */
2363 schedule_insns (rtl_dump_file);
2365 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2367 timevar_pop (TV_SCHED);
2372 /* Run second scheduling pass after reload. */
2374 rest_of_handle_sched2 (tree decl, rtx insns)
2376 timevar_push (TV_SCHED2);
2377 open_dump_file (DFI_sched2, decl);
2379 /* Do control and data sched analysis again,
2380 and write some more of the results to dump file. */
2382 split_all_insns (1);
2384 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2386 schedule_ebbs (rtl_dump_file);
2387 /* No liveness updating code yet, but it should be easy to do.
2388 reg-stack recompute the liveness when needed for now. */
2389 count_or_remove_death_notes (NULL, 1);
2390 cleanup_cfg (CLEANUP_EXPENSIVE);
2393 schedule_insns (rtl_dump_file);
2395 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2396 timevar_pop (TV_SCHED2);
2402 /* Register allocation pre-pass, to reduce number of moves necessary
2403 for two-address machines. */
2405 rest_of_handle_regmove (tree decl, rtx insns)
2407 timevar_push (TV_REGMOVE);
2408 open_dump_file (DFI_regmove, decl);
2410 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2412 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2413 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2414 timevar_pop (TV_REGMOVE);
2421 rest_of_handle_tracer (tree decl, rtx insns)
2423 open_dump_file (DFI_tracer, decl);
2425 dump_flow_info (rtl_dump_file);
2427 cleanup_cfg (CLEANUP_EXPENSIVE);
2428 reg_scan (insns, max_reg_num (), 0);
2429 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2432 /* If-conversion and CFG cleanup. */
2434 rest_of_handle_if_conversion (tree decl, rtx insns)
2436 open_dump_file (DFI_ce1, decl);
2437 if (flag_if_conversion)
2439 timevar_push (TV_IFCVT);
2441 dump_flow_info (rtl_dump_file);
2442 cleanup_cfg (CLEANUP_EXPENSIVE);
2443 reg_scan (insns, max_reg_num (), 0);
2445 timevar_pop (TV_IFCVT);
2447 timevar_push (TV_JUMP);
2448 cleanup_cfg (CLEANUP_EXPENSIVE);
2449 reg_scan (insns, max_reg_num (), 0);
2450 timevar_pop (TV_JUMP);
2451 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2454 /* Rerun if-conversion, as combine may have simplified things enough
2455 to now meet sequence length restrictions. */
2457 rest_of_handle_if_after_combine (tree decl, rtx insns)
2459 timevar_push (TV_IFCVT);
2460 open_dump_file (DFI_ce2, decl);
2466 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2467 timevar_pop (TV_IFCVT);
2471 rest_of_handle_web (tree decl, rtx insns)
2473 open_dump_file (DFI_web, decl);
2474 timevar_push (TV_WEB);
2476 delete_trivially_dead_insns (insns, max_reg_num ());
2477 cleanup_cfg (CLEANUP_EXPENSIVE);
2479 timevar_pop (TV_WEB);
2480 close_dump_file (DFI_web, print_rtl_with_bb, insns);
2481 reg_scan (get_insns (), max_reg_num (), 0);
2484 /* Do branch profiling and static profile estimation passes. */
2486 rest_of_handle_branch_prob (tree decl, rtx insns)
2490 timevar_push (TV_BRANCH_PROB);
2491 open_dump_file (DFI_bp, decl);
2493 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2496 /* Discover and record the loop depth at the head of each basic
2497 block. The loop infrastructure does the real job for us. */
2498 flow_loops_find (&loops, LOOP_TREE);
2501 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2503 /* Estimate using heuristics if no profiling info is available. */
2504 if (flag_guess_branch_prob)
2505 estimate_probability (&loops);
2507 flow_loops_free (&loops);
2508 free_dominance_info (CDI_DOMINATORS);
2509 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2510 timevar_pop (TV_BRANCH_PROB);
2513 /* Do optimizations based on expression value profiles. */
2515 rest_of_handle_value_profile_transformations (tree decl, rtx insns)
2517 open_dump_file (DFI_vpt, decl);
2518 timevar_push (TV_VPT);
2520 if (value_profile_transformations ())
2521 cleanup_cfg (CLEANUP_EXPENSIVE);
2523 timevar_pop (TV_VPT);
2524 close_dump_file (DFI_vpt, print_rtl_with_bb, insns);
2527 /* Do control and data flow analysis; write some of the results to the
2530 rest_of_handle_cfg (tree decl, rtx insns)
2532 open_dump_file (DFI_cfg, decl);
2534 dump_flow_info (rtl_dump_file);
2536 cleanup_cfg (CLEANUP_EXPENSIVE
2537 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2539 /* It may make more sense to mark constant functions after dead code is
2540 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2541 may insert code making function non-constant, but we still must consider
2542 it as constant, otherwise -fbranch-probabilities will not read data back.
2544 life_analysis rarely eliminates modification of external memory.
2548 /* Alias analysis depends on this information and mark_constant_function
2549 depends on alias analysis. */
2550 reg_scan (insns, max_reg_num (), 1);
2551 mark_constant_function ();
2554 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2557 /* Purge addressofs. */
2559 rest_of_handle_addressof (tree decl, rtx insns)
2561 open_dump_file (DFI_addressof, decl);
2563 purge_addressof (insns);
2564 if (optimize && purge_all_dead_edges (0))
2565 delete_unreachable_blocks ();
2566 reg_scan (insns, max_reg_num (), 1);
2568 close_dump_file (DFI_addressof, print_rtl, insns);
2571 /* We may have potential sibling or tail recursion sites. Select one
2572 (of possibly multiple) methods of performing the call. */
2574 rest_of_handle_sibling_calls (rtx insns)
2577 optimize_sibling_and_tail_recursive_calls ();
2579 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2580 free_bb_for_insn ();
2581 find_exception_handler_labels ();
2582 rebuild_jump_labels (insns);
2583 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2585 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2586 notes before simplifying cfg and we must do lowering after sibcall
2587 that unhides parts of RTL chain and cleans up the CFG.
2589 Until sibcall is replaced by tree-level optimizer, lets just
2590 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2591 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2592 if (GET_CODE (insn) == NOTE
2593 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2596 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2599 /* Perform jump bypassing and control flow optimizations. */
2601 rest_of_handle_jump_bypass (tree decl, rtx insns)
2603 timevar_push (TV_BYPASS);
2604 open_dump_file (DFI_bypass, decl);
2606 cleanup_cfg (CLEANUP_EXPENSIVE);
2607 reg_scan (insns, max_reg_num (), 1);
2609 if (bypass_jumps (rtl_dump_file))
2611 rebuild_jump_labels (insns);
2612 cleanup_cfg (CLEANUP_EXPENSIVE);
2613 delete_trivially_dead_insns (insns, max_reg_num ());
2616 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2617 timevar_pop (TV_BYPASS);
2621 #ifdef ENABLE_CHECKING
2622 verify_flow_info ();
2626 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2627 if we must exit rest_of_compilation upon return. */
2629 rest_of_handle_inlining (tree decl)
2636 /* If we are reconsidering an inline function at the end of
2637 compilation, skip the stuff for making it inline. */
2638 if (cfun->rtl_inline_init)
2640 cfun->rtl_inline_init = 1;
2642 /* If this is nested inside an inlined external function, pretend
2643 it was only declared. Since we cannot inline such functions,
2644 generating code for this one is not only not necessary but will
2645 confuse some debugging output writers. */
2646 for (parent = DECL_CONTEXT (current_function_decl);
2647 parent != NULL_TREE;
2648 parent = get_containing_scope (parent))
2649 if (TREE_CODE (parent) == FUNCTION_DECL
2650 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2652 DECL_INITIAL (decl) = 0;
2655 else if (TYPE_P (parent))
2656 /* A function in a local class should be treated normally. */
2659 /* If requested, consider whether to make this function inline. */
2660 if ((DECL_INLINE (decl) && !flag_no_inline)
2661 || flag_inline_functions)
2663 timevar_push (TV_INTEGRATION);
2664 lose = function_cannot_inline_p (decl);
2665 timevar_pop (TV_INTEGRATION);
2666 if (lose || ! optimize)
2668 if (warn_inline && lose && DECL_INLINE (decl))
2670 char *msg = concat ("%J", lose, NULL);
2671 warning (msg, decl);
2674 DECL_ABSTRACT_ORIGIN (decl) = 0;
2675 /* Don't really compile an extern inline function.
2676 If we can't make it inline, pretend
2677 it was only declared. */
2678 if (DECL_EXTERNAL (decl))
2680 DECL_INITIAL (decl) = 0;
2685 inlinable = DECL_INLINE (decl) = 1;
2688 insns = get_insns ();
2690 /* Dump the rtl code if we are dumping rtl. */
2692 if (open_dump_file (DFI_rtl, decl))
2694 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2695 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2696 close_dump_file (DFI_rtl, print_rtl, insns);
2699 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2700 sorts of eh initialization. Delay this until after the
2701 initial rtl dump so that we can see the original nesting. */
2702 convert_from_eh_region_ranges ();
2704 /* If function is inline, and we don't yet know whether to
2705 compile it by itself, defer decision till end of compilation.
2706 wrapup_global_declarations will (indirectly) call
2707 rest_of_compilation again for those functions that need to
2708 be output. Also defer those functions that we are supposed
2712 || (DECL_INLINE (decl)
2713 /* Egad. This RTL deferral test conflicts with Fortran assumptions
2714 for unreferenced symbols. See g77.f-torture/execute/980520-1.f.
2715 But removing this line from the check breaks all languages that
2716 use the call graph to output symbols. This hard-coded check is
2717 the least invasive work-around. */
2718 && (flag_inline_functions
2719 || strcmp (lang_hooks.name, "GNU F77") == 0)
2720 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2721 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2722 && ! flag_keep_inline_functions)
2723 || DECL_EXTERNAL (decl))))
2724 DECL_DEFER_OUTPUT (decl) = 1;
2726 if (DECL_INLINE (decl))
2727 /* DWARF wants separate debugging info for abstract and
2728 concrete instances of all inline functions, including those
2729 declared inline but not inlined, and those inlined even
2730 though they weren't declared inline. Conveniently, that's
2731 what DECL_INLINE means at this point. */
2732 (*debug_hooks->deferred_inline_function) (decl);
2734 if (DECL_DEFER_OUTPUT (decl))
2736 /* If -Wreturn-type, we have to do a bit of compilation. We just
2737 want to call cleanup the cfg to figure out whether or not we can
2738 fall off the end of the function; we do the minimum amount of
2739 work necessary to make that safe. */
2740 if (warn_return_type)
2742 int saved_optimize = optimize;
2745 rebuild_jump_labels (insns);
2746 find_exception_handler_labels ();
2747 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2748 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2749 optimize = saved_optimize;
2751 /* CFG is no longer maintained up-to-date. */
2752 free_bb_for_insn ();
2755 set_nothrow_function_flags ();
2756 if (current_function_nothrow)
2757 /* Now we know that this can't throw; set the flag for the benefit
2758 of other functions later in this translation unit. */
2759 TREE_NOTHROW (current_function_decl) = 1;
2761 timevar_push (TV_INTEGRATION);
2762 save_for_inline (decl);
2763 timevar_pop (TV_INTEGRATION);
2764 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2768 /* If specified extern inline but we aren't inlining it, we are
2769 done. This goes for anything that gets here with DECL_EXTERNAL
2770 set, not just things with DECL_INLINE. */
2771 return (bool) DECL_EXTERNAL (decl);
2774 /* Try to identify useless null pointer tests and delete them. */
2776 rest_of_handle_null_pointer (tree decl, rtx insns)
2778 open_dump_file (DFI_null, decl);
2780 dump_flow_info (rtl_dump_file);
2782 if (delete_null_pointer_checks (insns))
2783 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2785 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2788 /* Try combining insns through substitution. */
2790 rest_of_handle_combine (tree decl, rtx insns)
2792 int rebuild_jump_labels_after_combine = 0;
2794 timevar_push (TV_COMBINE);
2795 open_dump_file (DFI_combine, decl);
2797 rebuild_jump_labels_after_combine
2798 = combine_instructions (insns, max_reg_num ());
2800 /* Combining insns may have turned an indirect jump into a
2801 direct jump. Rebuild the JUMP_LABEL fields of jumping
2803 if (rebuild_jump_labels_after_combine)
2805 timevar_push (TV_JUMP);
2806 rebuild_jump_labels (insns);
2807 timevar_pop (TV_JUMP);
2809 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2812 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2813 timevar_pop (TV_COMBINE);
2818 /* Perform life analysis. */
2820 rest_of_handle_life (tree decl, rtx insns)
2822 open_dump_file (DFI_life, decl);
2825 #ifdef ENABLE_CHECKING
2826 verify_flow_info ();
2828 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2830 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2832 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2833 timevar_pop (TV_FLOW);
2835 if (warn_uninitialized)
2837 uninitialized_vars_warning (DECL_INITIAL (decl));
2839 setjmp_args_warning ();
2844 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2846 /* Insns were inserted, and possibly pseudos created, so
2847 things might look a bit different. */
2848 insns = get_insns ();
2849 allocate_reg_life_data ();
2850 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2851 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2857 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2862 /* Perform common subexpression elimination. Nonzero value from
2863 `cse_main' means that jumps were simplified and some code may now
2864 be unreachable, so do jump optimization again. */
2866 rest_of_handle_cse (tree decl, rtx insns)
2870 open_dump_file (DFI_cse, decl);
2872 dump_flow_info (rtl_dump_file);
2873 timevar_push (TV_CSE);
2875 reg_scan (insns, max_reg_num (), 1);
2877 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2879 rebuild_jump_labels (insns);
2880 if (purge_all_dead_edges (0))
2881 delete_unreachable_blocks ();
2883 delete_trivially_dead_insns (insns, max_reg_num ());
2885 /* If we are not running more CSE passes, then we are no longer
2886 expecting CSE to be run. But always rerun it in a cheap mode. */
2887 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2889 if (tem || optimize > 1)
2890 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2891 /* Try to identify useless null pointer tests and delete them. */
2892 if (flag_delete_null_pointer_checks)
2894 timevar_push (TV_JUMP);
2896 if (delete_null_pointer_checks (insns))
2897 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2898 timevar_pop (TV_JUMP);
2901 /* The second pass of jump optimization is likely to have
2902 removed a bunch more instructions. */
2903 renumber_insns (rtl_dump_file);
2905 timevar_pop (TV_CSE);
2906 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2909 /* Run second CSE pass after loop optimizations. */
2911 rest_of_handle_cse2 (tree decl, rtx insns)
2915 timevar_push (TV_CSE2);
2916 open_dump_file (DFI_cse2, decl);
2918 dump_flow_info (rtl_dump_file);
2919 /* CFG is no longer maintained up-to-date. */
2920 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2922 /* Run a pass to eliminate duplicated assignments to condition code
2923 registers. We have to run this after bypass_jumps, because it
2924 makes it harder for that pass to determine whether a jump can be
2926 cse_condition_code_reg ();
2928 purge_all_dead_edges (0);
2929 delete_trivially_dead_insns (insns, max_reg_num ());
2933 timevar_push (TV_JUMP);
2934 rebuild_jump_labels (insns);
2935 cleanup_cfg (CLEANUP_EXPENSIVE);
2936 timevar_pop (TV_JUMP);
2938 reg_scan (insns, max_reg_num (), 0);
2939 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2941 timevar_pop (TV_CSE2);
2944 /* Perform global cse. */
2946 rest_of_handle_gcse (tree decl, rtx insns)
2948 int save_csb, save_cfj;
2951 timevar_push (TV_GCSE);
2952 open_dump_file (DFI_gcse, decl);
2954 tem = gcse_main (insns, rtl_dump_file);
2955 rebuild_jump_labels (insns);
2956 delete_trivially_dead_insns (insns, max_reg_num ());
2958 save_csb = flag_cse_skip_blocks;
2959 save_cfj = flag_cse_follow_jumps;
2960 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2962 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2963 if (current_function_calls_constant_p)
2964 purge_builtin_constant_p ();
2966 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2968 if (flag_expensive_optimizations)
2970 timevar_push (TV_CSE);
2971 reg_scan (insns, max_reg_num (), 1);
2972 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2973 purge_all_dead_edges (0);
2974 delete_trivially_dead_insns (insns, max_reg_num ());
2975 timevar_pop (TV_CSE);
2976 cse_not_expected = !flag_rerun_cse_after_loop;
2979 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2980 things up. Then possibly re-run CSE again. */
2984 timevar_push (TV_JUMP);
2985 rebuild_jump_labels (insns);
2986 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2987 timevar_pop (TV_JUMP);
2989 if (flag_expensive_optimizations)
2991 timevar_push (TV_CSE);
2992 reg_scan (insns, max_reg_num (), 1);
2993 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2994 purge_all_dead_edges (0);
2995 delete_trivially_dead_insns (insns, max_reg_num ());
2996 timevar_pop (TV_CSE);
3000 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
3001 timevar_pop (TV_GCSE);
3004 flag_cse_skip_blocks = save_csb;
3005 flag_cse_follow_jumps = save_cfj;
3006 #ifdef ENABLE_CHECKING
3007 verify_flow_info ();
3011 /* Move constant computations out of loops. */
3013 rest_of_handle_loop_optimize (tree decl, rtx insns)
3015 int do_unroll, do_prefetch;
3017 timevar_push (TV_LOOP);
3018 delete_dead_jumptables ();
3019 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3020 open_dump_file (DFI_loop, decl);
3022 /* CFG is no longer maintained up-to-date. */
3023 free_bb_for_insn ();
3025 if (flag_unroll_loops)
3026 do_unroll = LOOP_AUTO_UNROLL; /* Having two unrollers is useless. */
3028 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3029 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3031 if (flag_rerun_loop_opt)
3033 cleanup_barriers ();
3035 /* We only want to perform unrolling once. */
3036 loop_optimize (insns, rtl_dump_file, do_unroll);
3039 /* The first call to loop_optimize makes some instructions
3040 trivially dead. We delete those instructions now in the
3041 hope that doing so will make the heuristics in loop work
3042 better and possibly speed up compilation. */
3043 delete_trivially_dead_insns (insns, max_reg_num ());
3045 /* The regscan pass is currently necessary as the alias
3046 analysis code depends on this information. */
3047 reg_scan (insns, max_reg_num (), 1);
3049 cleanup_barriers ();
3050 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3052 /* Loop can create trivially dead instructions. */
3053 delete_trivially_dead_insns (insns, max_reg_num ());
3054 close_dump_file (DFI_loop, print_rtl, insns);
3055 timevar_pop (TV_LOOP);
3056 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3061 /* Perform loop optimizations. It might be better to do them a bit
3062 sooner, but we want the profile feedback to work more
3065 rest_of_handle_loop2 (tree decl, rtx insns)
3067 struct loops *loops;
3068 timevar_push (TV_LOOP);
3069 open_dump_file (DFI_loop2, decl);
3071 dump_flow_info (rtl_dump_file);
3073 loops = loop_optimizer_init (rtl_dump_file);
3077 /* The optimizations: */
3078 if (flag_unswitch_loops)
3079 unswitch_loops (loops);
3081 if (flag_peel_loops || flag_unroll_loops)
3082 unroll_and_peel_loops (loops,
3083 (flag_peel_loops ? UAP_PEEL : 0) |
3084 (flag_unroll_loops ? UAP_UNROLL : 0) |
3085 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3087 loop_optimizer_finalize (loops, rtl_dump_file);
3090 cleanup_cfg (CLEANUP_EXPENSIVE);
3091 delete_trivially_dead_insns (insns, max_reg_num ());
3092 reg_scan (insns, max_reg_num (), 0);
3094 dump_flow_info (rtl_dump_file);
3095 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3096 timevar_pop (TV_LOOP);
3100 /* This is called from finish_function (within langhooks.parse_file)
3101 after each top-level definition is parsed.
3102 It is supposed to compile that function or variable
3103 and output the assembler code for it.
3104 After we return, the tree storage is freed. */
3107 rest_of_compilation (tree decl)
3111 timevar_push (TV_REST_OF_COMPILATION);
3113 /* Register rtl specific functions for cfg. */
3114 rtl_register_cfg_hooks ();
3116 /* Now that we're out of the frontend, we shouldn't have any more
3117 CONCATs anywhere. */
3118 generating_concat_p = 0;
3120 /* When processing delayed functions, prepare_function_start() won't
3121 have been run to re-initialize it. */
3122 cse_not_expected = ! optimize;
3124 /* First, make sure that NOTE_BLOCK is set correctly for each
3125 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3126 if (!cfun->x_whole_function_mode_p)
3129 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3130 tree in sensible shape. So, we just recalculate it here. */
3131 if (cfun->x_whole_function_mode_p)
3136 if (rest_of_handle_inlining (decl))
3137 goto exit_rest_of_compilation;
3139 /* If we're emitting a nested function, make sure its parent gets
3140 emitted as well. Doing otherwise confuses debug info. */
3143 for (parent = DECL_CONTEXT (current_function_decl);
3144 parent != NULL_TREE;
3145 parent = get_containing_scope (parent))
3146 if (TREE_CODE (parent) == FUNCTION_DECL)
3147 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3150 /* We are now committed to emitting code for this function. Do any
3151 preparation, such as emitting abstract debug info for the inline
3152 before it gets mangled by optimization. */
3153 if (cgraph_function_possibly_inlined_p (decl))
3154 (*debug_hooks->outlining_inline_function) (decl);
3156 /* Remove any notes we don't need. That will make iterating
3157 over the instruction sequence faster, and allow the garbage
3158 collector to reclaim the memory used by the notes. */
3159 remove_unnecessary_notes ();
3164 /* Initialize some variables used by the optimizers. */
3165 init_function_for_compilation ();
3167 if (! DECL_DEFER_OUTPUT (decl))
3168 TREE_ASM_WRITTEN (decl) = 1;
3170 /* Now that integrate will no longer see our rtl, we need not
3171 distinguish between the return value of this function and the
3172 return value of called functions. Also, we can remove all SETs
3173 of subregs of hard registers; they are only here because of
3174 integrate. Also, we can now initialize pseudos intended to
3175 carry magic hard reg data throughout the function. */
3176 rtx_equal_function_value_matters = 0;
3177 purge_hard_subreg_sets (get_insns ());
3179 /* Early return if there were errors. We can run afoul of our
3180 consistency checks, and there's not really much point in fixing them.
3181 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3182 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3183 || errorcount || sorrycount)
3184 goto exit_rest_of_compilation;
3186 timevar_push (TV_JUMP);
3187 open_dump_file (DFI_sibling, decl);
3188 insns = get_insns ();
3189 rebuild_jump_labels (insns);
3190 find_exception_handler_labels ();
3191 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3193 delete_unreachable_blocks ();
3195 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3196 if (flag_guess_branch_prob)
3198 timevar_push (TV_BRANCH_PROB);
3199 note_prediction_to_br_prob ();
3200 timevar_pop (TV_BRANCH_PROB);
3203 if (flag_optimize_sibling_calls)
3204 rest_of_handle_sibling_calls (insns);
3206 /* We have to issue these warnings now already, because CFG cleanups
3207 further down may destroy the required information. However, this
3208 must be done after the sibcall optimization pass because the barrier
3209 emitted for noreturn calls that are candidate for the optimization
3210 is folded into the CALL_PLACEHOLDER until after this pass, so the
3211 CFG is inaccurate. */
3212 check_function_return_warnings ();
3214 timevar_pop (TV_JUMP);
3216 insn_locators_initialize ();
3217 /* Complete generation of exception handling code. */
3220 timevar_push (TV_JUMP);
3221 open_dump_file (DFI_eh, decl);
3223 finish_eh_generation ();
3225 close_dump_file (DFI_eh, print_rtl, get_insns ());
3226 timevar_pop (TV_JUMP);
3229 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3230 generation, which might create new sets. */
3231 emit_initial_value_sets ();
3234 /* If we are doing position-independent code generation, now
3235 is the time to output special prologues and epilogues.
3236 We do not want to do this earlier, because it just clutters
3237 up inline functions with meaningless insns. */
3242 insns = get_insns ();
3244 /* Copy any shared structure that should not be shared. */
3245 unshare_all_rtl (current_function_decl, insns);
3247 #ifdef SETJMP_VIA_SAVE_AREA
3248 /* This must be performed before virtual register instantiation.
3249 Please be aware the everything in the compiler that can look
3250 at the RTL up to this point must understand that REG_SAVE_AREA
3251 is just like a use of the REG contained inside. */
3252 if (current_function_calls_alloca)
3253 optimize_save_area_alloca (insns);
3256 /* Instantiate all virtual registers. */
3257 instantiate_virtual_regs (current_function_decl, insns);
3259 open_dump_file (DFI_jump, decl);
3261 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3262 are initialized and to compute whether control can drop off the end
3265 timevar_push (TV_JUMP);
3266 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3267 before jump optimization switches branch directions. */
3268 if (flag_guess_branch_prob)
3269 expected_value_to_br_prob ();
3271 reg_scan (insns, max_reg_num (), 0);
3272 rebuild_jump_labels (insns);
3273 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3274 delete_trivially_dead_insns (insns, max_reg_num ());
3276 dump_flow_info (rtl_dump_file);
3277 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3278 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3282 free_bb_for_insn ();
3283 copy_loop_headers (insns);
3284 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3286 purge_line_number_notes (insns);
3288 timevar_pop (TV_JUMP);
3289 close_dump_file (DFI_jump, print_rtl, insns);
3291 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3292 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3293 goto exit_rest_of_compilation;
3295 timevar_push (TV_JUMP);
3298 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3300 if (flag_delete_null_pointer_checks)
3301 rest_of_handle_null_pointer (decl, insns);
3303 /* Jump optimization, and the removal of NULL pointer checks, may
3304 have reduced the number of instructions substantially. CSE, and
3305 future passes, allocate arrays whose dimensions involve the
3306 maximum instruction UID, so if we can reduce the maximum UID
3307 we'll save big on memory. */
3308 renumber_insns (rtl_dump_file);
3309 timevar_pop (TV_JUMP);
3311 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3316 rest_of_handle_cse (decl, insns);
3318 rest_of_handle_addressof (decl, insns);
3325 rest_of_handle_gcse (decl, insns);
3327 if (flag_loop_optimize)
3328 rest_of_handle_loop_optimize (decl, insns);
3331 rest_of_handle_jump_bypass (decl, insns);
3334 timevar_push (TV_FLOW);
3336 rest_of_handle_cfg (decl, insns);
3339 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3341 rest_of_handle_branch_prob (decl, insns);
3343 if (flag_branch_probabilities
3344 && flag_profile_values
3345 && flag_value_profile_transformations)
3346 rest_of_handle_value_profile_transformations (decl, insns);
3348 /* Remove the death notes created for vpt. */
3349 if (flag_profile_values)
3350 count_or_remove_death_notes (NULL, 1);
3354 rest_of_handle_if_conversion (decl, insns);
3357 rest_of_handle_tracer (decl, insns);
3360 && (flag_unswitch_loops
3362 || flag_unroll_loops))
3363 rest_of_handle_loop2 (decl, insns);
3366 rest_of_handle_web (decl, insns);
3368 if (flag_rerun_cse_after_loop)
3369 rest_of_handle_cse2 (decl, insns);
3371 cse_not_expected = 1;
3373 rest_of_handle_life (decl, insns);
3376 rest_of_handle_combine (decl, insns);
3378 if (flag_if_conversion)
3379 rest_of_handle_if_after_combine (decl, insns);
3381 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3382 rest_of_handle_regmove (decl, insns);
3384 /* Do unconditional splitting before register allocation to allow machine
3385 description to add extra information not needed previously. */
3386 split_all_insns (1);
3388 #ifdef OPTIMIZE_MODE_SWITCHING
3389 timevar_push (TV_MODE_SWITCH);
3392 optimize_mode_switching (NULL);
3395 timevar_pop (TV_MODE_SWITCH);
3398 /* Any of the several passes since flow1 will have munged register
3399 lifetime data a bit. We need it to be up to date for scheduling
3400 (see handling of reg_known_equiv in init_alias_analysis). */
3401 recompute_reg_usage (insns, !optimize_size);
3403 #ifdef INSN_SCHEDULING
3404 rest_of_handle_sched (decl, insns);
3407 /* Determine if the current function is a leaf before running reload
3408 since this can impact optimizations done by the prologue and
3409 epilogue thus changing register elimination offsets. */
3410 current_function_is_leaf = leaf_function_p ();
3412 timevar_push (TV_LOCAL_ALLOC);
3413 open_dump_file (DFI_lreg, decl);
3415 if (flag_new_regalloc)
3417 if (rest_of_handle_new_regalloc (decl, insns))
3418 goto exit_rest_of_compilation;
3422 if (rest_of_handle_old_regalloc (decl, insns))
3423 goto exit_rest_of_compilation;
3428 open_dump_file (DFI_postreload, decl);
3430 /* Do a very simple CSE pass over just the hard registers. */
3433 timevar_push (TV_RELOAD_CSE_REGS);
3434 reload_cse_regs (insns);
3435 /* reload_cse_regs can eliminate potentially-trapping MEMs.
3436 Remove any EH edges associated with them. */
3437 if (flag_non_call_exceptions)
3438 purge_all_dead_edges (0);
3439 timevar_pop (TV_RELOAD_CSE_REGS);
3442 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3444 /* Re-create the death notes which were deleted during reload. */
3445 timevar_push (TV_FLOW2);
3446 open_dump_file (DFI_flow2, decl);
3448 #ifdef ENABLE_CHECKING
3449 verify_flow_info ();
3452 /* If optimizing, then go ahead and split insns now. */
3456 split_all_insns (0);
3458 if (flag_branch_target_load_optimize)
3460 open_dump_file (DFI_branch_target_load, decl);
3462 branch_target_load_optimize (insns, false);
3464 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3470 cleanup_cfg (CLEANUP_EXPENSIVE);
3472 /* On some machines, the prologue and epilogue code, or parts thereof,
3473 can be represented as RTL. Doing so lets us schedule insns between
3474 it and the rest of the code and also allows delayed branch
3475 scheduling to operate in the epilogue. */
3476 thread_prologue_and_epilogue_insns (insns);
3477 epilogue_completed = 1;
3481 life_analysis (insns, rtl_dump_file, PROP_POSTRELOAD);
3482 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3483 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3485 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3486 even for machines with possibly nonzero RETURN_POPS_ARGS
3487 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3488 push instructions will have popping returns. */
3489 #ifndef PUSH_ROUNDING
3490 if (!ACCUMULATE_OUTGOING_ARGS)
3492 combine_stack_adjustments ();
3497 flow2_completed = 1;
3499 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3500 timevar_pop (TV_FLOW2);
3502 #ifdef HAVE_peephole2
3503 if (optimize > 0 && flag_peephole2)
3505 timevar_push (TV_PEEPHOLE2);
3506 open_dump_file (DFI_peephole2, decl);
3508 peephole2_optimize (rtl_dump_file);
3510 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3511 timevar_pop (TV_PEEPHOLE2);
3515 open_dump_file (DFI_ce3, decl);
3517 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3518 splitting possibly introduced more crossjumping opportunities. */
3519 cleanup_cfg (CLEANUP_EXPENSIVE
3520 | CLEANUP_UPDATE_LIFE
3521 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3522 if (flag_if_conversion2)
3524 timevar_push (TV_IFCVT2);
3528 timevar_pop (TV_IFCVT2);
3530 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3534 if (flag_rename_registers || flag_cprop_registers)
3535 rest_of_handle_regrename (decl, insns);
3537 rest_of_handle_reorder_blocks (decl, insns);
3540 if (flag_branch_target_load_optimize2)
3542 /* Leave this a warning for now so that it is possible to experiment
3543 with running this pass twice. In 3.6, we should either make this
3544 an error, or use separate dump files. */
3545 if (flag_branch_target_load_optimize)
3546 warning ("branch target register load optimization is not intended "
3549 open_dump_file (DFI_branch_target_load, decl);
3551 branch_target_load_optimize (insns, true);
3553 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3558 #ifdef INSN_SCHEDULING
3559 if (optimize > 0 && flag_schedule_insns_after_reload)
3560 rest_of_handle_sched2 (decl, insns);
3563 #ifdef LEAF_REGISTERS
3564 current_function_uses_only_leaf_regs
3565 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3569 rest_of_handle_stack_regs (decl, insns);
3572 compute_alignments ();
3574 /* CFG is no longer maintained up-to-date. */
3575 free_bb_for_insn ();
3577 if (targetm.machine_dependent_reorg != 0)
3578 rest_of_handle_machine_reorg (decl, insns);
3580 purge_line_number_notes (insns);
3581 cleanup_barriers ();
3584 if (optimize > 0 && flag_delayed_branch)
3585 rest_of_handle_delay_slots (decl, insns);
3588 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3589 timevar_push (TV_SHORTEN_BRANCH);
3590 split_all_insns_noflow ();
3591 timevar_pop (TV_SHORTEN_BRANCH);
3594 convert_to_eh_region_ranges ();
3596 /* Shorten branches. */
3597 timevar_push (TV_SHORTEN_BRANCH);
3598 shorten_branches (get_insns ());
3599 timevar_pop (TV_SHORTEN_BRANCH);
3601 set_nothrow_function_flags ();
3602 if (current_function_nothrow)
3603 /* Now we know that this can't throw; set the flag for the benefit
3604 of other functions later in this translation unit. */
3605 TREE_NOTHROW (current_function_decl) = 1;
3607 rest_of_handle_final (decl, insns);
3609 /* Write DBX symbols if requested. */
3611 /* Note that for those inline functions where we don't initially
3612 know for certain that we will be generating an out-of-line copy,
3613 the first invocation of this routine (rest_of_compilation) will
3614 skip over this code by doing a `goto exit_rest_of_compilation;'.
3615 Later on, wrapup_global_declarations will (indirectly) call
3616 rest_of_compilation again for those inline functions that need
3617 to have out-of-line copies generated. During that call, we
3618 *will* be routed past here. */
3620 timevar_push (TV_SYMOUT);
3621 (*debug_hooks->function_decl) (decl);
3622 timevar_pop (TV_SYMOUT);
3624 exit_rest_of_compilation:
3626 coverage_end_function ();
3628 /* In case the function was not output,
3629 don't leave any temporary anonymous types
3630 queued up for sdb output. */
3631 #ifdef SDB_DEBUGGING_INFO
3632 if (write_symbols == SDB_DEBUG)
3633 sdbout_types (NULL_TREE);
3636 reload_completed = 0;
3637 epilogue_completed = 0;
3638 flow2_completed = 0;
3641 timevar_push (TV_FINAL);
3643 /* Clear out the insn_length contents now that they are no
3645 init_insn_lengths ();
3647 /* Show no temporary slots allocated. */
3650 free_basic_block_vars (0);
3651 free_bb_for_insn ();
3653 timevar_pop (TV_FINAL);
3655 if ((*targetm.binds_local_p) (current_function_decl))
3657 int pref = cfun->preferred_stack_boundary;
3658 if (cfun->recursive_call_emit
3659 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3660 pref = cfun->stack_alignment_needed;
3661 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3665 /* Make sure volatile mem refs aren't considered valid operands for
3666 arithmetic insns. We must call this here if this is a nested inline
3667 function, since the above code leaves us in the init_recog state
3668 (from final.c), and the function context push/pop code does not
3669 save/restore volatile_ok.
3671 ??? Maybe it isn't necessary for expand_start_function to call this
3672 anymore if we do it here? */
3674 init_recog_no_volatile ();
3676 /* We're done with this function. Free up memory if we can. */
3677 free_after_parsing (cfun);
3678 if (! DECL_DEFER_OUTPUT (decl))
3680 free_after_compilation (cfun);
3681 DECL_SAVED_INSNS (decl) = 0;
3687 timevar_pop (TV_REST_OF_COMPILATION);
3690 /* Display help for target options. */
3692 display_target_options (void)
3695 static bool displayed = false;
3697 /* Avoid double printing for --help --target-help. */
3703 if (ARRAY_SIZE (target_switches) > 1
3704 #ifdef TARGET_OPTIONS
3705 || ARRAY_SIZE (target_options) > 1
3713 printf (_("\nTarget specific options:\n"));
3715 for (i = ARRAY_SIZE (target_switches); i--;)
3717 const char *option = target_switches[i].name;
3718 const char *description = target_switches[i].description;
3720 if (option == NULL || *option == 0)
3722 else if (description == NULL)
3727 printf (_(" -m%-23s [undocumented]\n"), option);
3729 else if (*description != 0)
3730 doc += printf (" -m%-23s %s\n", option, _(description));
3733 #ifdef TARGET_OPTIONS
3734 for (i = ARRAY_SIZE (target_options); i--;)
3736 const char *option = target_options[i].prefix;
3737 const char *description = target_options[i].description;
3739 if (option == NULL || *option == 0)
3741 else if (description == NULL)
3746 printf (_(" -m%-23s [undocumented]\n"), option);
3748 else if (*description != 0)
3749 doc += printf (" -m%-23s %s\n", option, _(description));
3755 printf (_("\nThere are undocumented target specific options as well.\n"));
3757 printf (_(" They exist, but they are not documented.\n"));
3762 /* Parse a -d... command line switch. */
3765 decode_d_option (const char *arg)
3773 for (i = 0; i < (int) DFI_MAX; ++i)
3774 dump_file[i].enabled = 1;
3780 flag_print_asm_name = 1;
3783 flag_dump_rtl_in_asm = 1;
3784 flag_print_asm_name = 1;
3787 graph_dump_format = vcg;
3790 rtl_dump_and_exit = 1;
3795 case 'D': /* These are handled by the preprocessor. */
3799 setup_core_dumping();
3804 for (i = 0; i < (int) DFI_MAX; ++i)
3805 if (c == dump_file[i].debug_switch)
3807 dump_file[i].enabled = 1;
3812 warning ("unrecognized gcc debugging option: %c", c);
3817 /* Indexed by enum debug_info_type. */
3818 const char *const debug_type_names[] =
3820 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3823 /* Decode -m switches. */
3824 /* Decode the switch -mNAME. */
3827 set_target_switch (const char *name)
3830 int valid_target_option = 0;
3832 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3833 if (!strcmp (target_switches[j].name, name))
3835 if (target_switches[j].value < 0)
3836 target_flags &= ~-target_switches[j].value;
3838 target_flags |= target_switches[j].value;
3841 if (target_switches[j].value < 0)
3842 target_flags_explicit |= -target_switches[j].value;
3844 target_flags_explicit |= target_switches[j].value;
3846 valid_target_option = 1;
3849 #ifdef TARGET_OPTIONS
3850 if (!valid_target_option)
3851 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3853 int len = strlen (target_options[j].prefix);
3854 if (target_options[j].value)
3856 if (!strcmp (target_options[j].prefix, name))
3858 *target_options[j].variable = target_options[j].value;
3859 valid_target_option = 1;
3864 if (!strncmp (target_options[j].prefix, name, len))
3866 *target_options[j].variable = name + len;
3867 valid_target_option = 1;
3873 if (!valid_target_option)
3874 error ("invalid option `%s'", name);
3877 /* Print version information to FILE.
3878 Each line begins with INDENT (for the case where FILE is the
3879 assembler output file). */
3882 print_version (FILE *file, const char *indent)
3885 #define __VERSION__ "[?]"
3889 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3891 "%s%s%s version %s (%s) compiled by CC.\n"
3893 , indent, *indent != 0 ? " " : "",
3894 lang_hooks.name, version_string, TARGET_NAME,
3895 indent, __VERSION__);
3896 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3897 indent, *indent != 0 ? " " : "",
3898 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3901 /* Print an option value and return the adjusted position in the line.
3902 ??? We don't handle error returns from fprintf (disk full); presumably
3903 other code will catch a disk full though. */
3906 print_single_switch (FILE *file, int pos, int max,
3907 const char *indent, const char *sep, const char *term,
3908 const char *type, const char *name)
3910 /* The ultrix fprintf returns 0 on success, so compute the result we want
3911 here since we need it for the following test. */
3912 int len = strlen (sep) + strlen (type) + strlen (name);
3917 fprintf (file, "%s", term);
3922 fprintf (file, "%s", indent);
3923 pos = strlen (indent);
3925 fprintf (file, "%s%s%s", sep, type, name);
3930 /* Print active target switches to FILE.
3931 POS is the current cursor position and MAX is the size of a "line".
3932 Each line begins with INDENT and ends with TERM.
3933 Each switch is separated from the next by SEP. */
3936 print_switch_values (FILE *file, int pos, int max,
3937 const char *indent, const char *sep, const char *term)
3942 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3943 that it can be printed below. This helps reproducibility. */
3946 /* Print the options as passed. */
3947 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3948 _("options passed: "), "");
3950 for (p = &save_argv[1]; *p != NULL; p++)
3954 if (strcmp (*p, "-o") == 0)
3960 if (strcmp (*p, "-quiet") == 0)
3962 if (strcmp (*p, "-version") == 0)
3967 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3970 fprintf (file, "%s", term);
3972 /* Print the -f and -m options that have been enabled.
3973 We don't handle language specific options but printing argv
3976 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3977 _("options enabled: "), "");
3979 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3980 if (*f_options[j].variable == f_options[j].on_value)
3981 pos = print_single_switch (file, pos, max, indent, sep, term,
3982 "-f", f_options[j].string);
3984 /* Print target specific options. */
3986 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3987 if (target_switches[j].name[0] != '\0'
3988 && target_switches[j].value > 0
3989 && ((target_switches[j].value & target_flags)
3990 == target_switches[j].value))
3992 pos = print_single_switch (file, pos, max, indent, sep, term,
3993 "-m", target_switches[j].name);
3996 #ifdef TARGET_OPTIONS
3997 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3998 if (*target_options[j].variable != NULL)
4001 sprintf (prefix, "-m%s", target_options[j].prefix);
4002 pos = print_single_switch (file, pos, max, indent, sep, term,
4003 prefix, *target_options[j].variable);
4007 fprintf (file, "%s", term);
4010 /* Open assembly code output file. Do this even if -fsyntax-only is
4011 on, because then the driver will have provided the name of a
4012 temporary file or bit bucket for us. NAME is the file specified on
4013 the command line, possibly NULL. */
4015 init_asm_output (const char *name)
4017 if (name == NULL && asm_file_name == 0)
4018 asm_out_file = stdout;
4021 if (asm_file_name == 0)
4023 int len = strlen (dump_base_name);
4024 char *dumpname = xmalloc (len + 6);
4025 memcpy (dumpname, dump_base_name, len + 1);
4026 strip_off_ending (dumpname, len);
4027 strcat (dumpname, ".s");
4028 asm_file_name = dumpname;
4030 if (!strcmp (asm_file_name, "-"))
4031 asm_out_file = stdout;
4033 asm_out_file = fopen (asm_file_name, "w+");
4034 if (asm_out_file == 0)
4035 fatal_error ("can't open %s for writing: %m", asm_file_name);
4038 #ifdef IO_BUFFER_SIZE
4039 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
4040 _IOFBF, IO_BUFFER_SIZE);
4043 if (!flag_syntax_only)
4045 targetm.asm_out.file_start ();
4047 #ifdef ASM_COMMENT_START
4048 if (flag_verbose_asm)
4050 /* Print the list of options in effect. */
4051 print_version (asm_out_file, ASM_COMMENT_START);
4052 print_switch_values (asm_out_file, 0, MAX_LINE,
4053 ASM_COMMENT_START, " ", "\n");
4054 /* Add a blank line here so it appears in assembler output but not
4056 fprintf (asm_out_file, "\n");
4062 /* Default version of get_pch_validity.
4063 By default, every flag difference is fatal; that will be mostly right for
4064 most targets, but completely right for very few. */
4067 default_get_pch_validity (size_t *len)
4069 #ifdef TARGET_OPTIONS
4074 *len = sizeof (target_flags) + 2;
4075 #ifdef TARGET_OPTIONS
4076 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4079 if (*target_options[i].variable)
4080 *len += strlen (*target_options[i].variable);
4084 result = r = xmalloc (*len);
4088 memcpy (r, &target_flags, sizeof (target_flags));
4089 r += sizeof (target_flags);
4091 #ifdef TARGET_OPTIONS
4092 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4094 const char *str = *target_options[i].variable;
4098 l = strlen (str) + 1;
4107 /* Default version of pch_valid_p. */
4110 default_pch_valid_p (const void *data_p, size_t len)
4112 const char *data = (const char *)data_p;
4113 const char *flag_that_differs = NULL;
4116 /* -fpic and -fpie also usually make a PCH invalid. */
4117 if (data[0] != flag_pic)
4118 return _("created and used with different settings of -fpic");
4119 if (data[1] != flag_pie)
4120 return _("created and used with different settings of -fpie");
4123 /* Check target_flags. */
4124 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
4126 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
4131 memcpy (&tf, data, sizeof (target_flags));
4133 bits = target_switches[i].value;
4136 if ((target_flags & bits) != (tf & bits))
4138 flag_that_differs = target_switches[i].name;
4144 data += sizeof (target_flags);
4145 len -= sizeof (target_flags);
4147 /* Check string options. */
4148 #ifdef TARGET_OPTIONS
4149 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4151 const char *str = *target_options[i].variable;
4155 l = strlen (str) + 1;
4156 if (len < l || memcmp (data, str, l) != 0)
4158 flag_that_differs = target_options[i].prefix;
4171 asprintf (&r, _("created and used with differing settings of `-m%s'"),
4174 return _("out of memory");
4179 /* Default tree printer. Handles declarations only. */
4181 default_tree_printer (pretty_printer * pp, text_info *text)
4183 switch (*text->format_spec)
4189 tree t = va_arg (*text->args_ptr, tree);
4190 const char *n = DECL_NAME (t)
4191 ? (*lang_hooks.decl_printable_name) (t, 2)
4202 /* Initialization of the front end environment, before command line
4203 options are parsed. Signal handlers, internationalization etc.
4204 ARGV0 is main's argv[0]. */
4206 general_init (const char *argv0)
4210 p = argv0 + strlen (argv0);
4211 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4215 xmalloc_set_program_name (progname);
4219 gcc_init_libintl ();
4221 /* Initialize the diagnostics reporting machinery, so option parsing
4222 can give warnings and errors. */
4223 diagnostic_initialize (global_dc);
4224 /* Set a default printer. Language specific initializations will
4225 override it later. */
4226 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4228 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4230 signal (SIGSEGV, crash_signal);
4233 signal (SIGILL, crash_signal);
4236 signal (SIGBUS, crash_signal);
4239 signal (SIGABRT, crash_signal);
4241 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4242 signal (SIGIOT, crash_signal);
4245 signal (SIGFPE, crash_signal);
4248 /* Other host-specific signal setup. */
4249 (*host_hooks.extra_signals)();
4251 /* Initialize the garbage-collector, string pools and tree type hash
4257 /* Initialize register usage now so switches may override. */
4260 /* Register the language-independent parameters. */
4261 add_params (lang_independent_params, LAST_PARAM);
4263 /* This must be done after add_params but before argument processing. */
4264 init_ggc_heuristics();
4267 /* Process the options that have been parsed. */
4269 process_options (void)
4271 /* Allow the front end to perform consistency checks and do further
4272 initialization based on the command line options. This hook also
4273 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4274 so we can correctly initialize debug output. */
4275 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4276 input_filename = main_input_filename;
4278 #ifdef OVERRIDE_OPTIONS
4279 /* Some machines may reject certain combinations of options. */
4283 /* Set aux_base_name if not already set. */
4286 else if (main_input_filename)
4288 char *name = xstrdup (lbasename (main_input_filename));
4290 strip_off_ending (name, strlen (name));
4291 aux_base_name = name;
4294 aux_base_name = "gccaux";
4296 /* Set up the align_*_log variables, defaulting them to 1 if they
4297 were still unset. */
4298 if (align_loops <= 0) align_loops = 1;
4299 if (align_loops_max_skip > align_loops || !align_loops)
4300 align_loops_max_skip = align_loops - 1;
4301 align_loops_log = floor_log2 (align_loops * 2 - 1);
4302 if (align_jumps <= 0) align_jumps = 1;
4303 if (align_jumps_max_skip > align_jumps || !align_jumps)
4304 align_jumps_max_skip = align_jumps - 1;
4305 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4306 if (align_labels <= 0) align_labels = 1;
4307 align_labels_log = floor_log2 (align_labels * 2 - 1);
4308 if (align_labels_max_skip > align_labels || !align_labels)
4309 align_labels_max_skip = align_labels - 1;
4310 if (align_functions <= 0) align_functions = 1;
4311 align_functions_log = floor_log2 (align_functions * 2 - 1);
4313 /* Unrolling all loops implies that standard loop unrolling must also
4315 if (flag_unroll_all_loops)
4316 flag_unroll_loops = 1;
4318 if (flag_unroll_loops)
4320 flag_old_unroll_loops = 0;
4321 flag_old_unroll_all_loops = 0;
4324 if (flag_old_unroll_all_loops)
4325 flag_old_unroll_loops = 1;
4327 /* Old loop unrolling requires that strength_reduction be on also. Silently
4328 turn on strength reduction here if it isn't already on. Also, the loop
4329 unrolling code assumes that cse will be run after loop, so that must
4330 be turned on also. */
4331 if (flag_old_unroll_loops)
4333 flag_strength_reduce = 1;
4334 flag_rerun_cse_after_loop = 1;
4336 if (flag_unroll_loops || flag_peel_loops)
4337 flag_rerun_cse_after_loop = 1;
4339 if (flag_non_call_exceptions)
4340 flag_asynchronous_unwind_tables = 1;
4341 if (flag_asynchronous_unwind_tables)
4342 flag_unwind_tables = 1;
4344 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4346 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4347 flag_unit_at_a_time = 0;
4349 if (flag_value_profile_transformations)
4350 flag_profile_values = 1;
4352 /* Warn about options that are not supported on this machine. */
4353 #ifndef INSN_SCHEDULING
4354 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4355 warning ("instruction scheduling not supported on this target machine");
4358 if (flag_delayed_branch)
4359 warning ("this target machine does not have delayed branches");
4362 user_label_prefix = USER_LABEL_PREFIX;
4363 if (flag_leading_underscore != -1)
4365 /* If the default prefix is more complicated than "" or "_",
4366 issue a warning and ignore this option. */
4367 if (user_label_prefix[0] == 0 ||
4368 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4370 user_label_prefix = flag_leading_underscore ? "_" : "";
4373 warning ("-f%sleading-underscore not supported on this target machine",
4374 flag_leading_underscore ? "" : "no-");
4377 /* If we are in verbose mode, write out the version and maybe all the
4378 option flags in use. */
4381 print_version (stderr, "");
4383 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4386 if (flag_syntax_only)
4388 write_symbols = NO_DEBUG;
4392 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4394 if (debug_info_level == DINFO_LEVEL_NONE)
4395 write_symbols = NO_DEBUG;
4397 /* Now we know write_symbols, set up the debug hooks based on it.
4398 By default we do nothing for debug output. */
4399 if (write_symbols == NO_DEBUG)
4400 debug_hooks = &do_nothing_debug_hooks;
4401 #if defined(DBX_DEBUGGING_INFO)
4402 else if (write_symbols == DBX_DEBUG)
4403 debug_hooks = &dbx_debug_hooks;
4405 #if defined(XCOFF_DEBUGGING_INFO)
4406 else if (write_symbols == XCOFF_DEBUG)
4407 debug_hooks = &xcoff_debug_hooks;
4409 #ifdef SDB_DEBUGGING_INFO
4410 else if (write_symbols == SDB_DEBUG)
4411 debug_hooks = &sdb_debug_hooks;
4413 #ifdef DWARF2_DEBUGGING_INFO
4414 else if (write_symbols == DWARF2_DEBUG)
4415 debug_hooks = &dwarf2_debug_hooks;
4417 #ifdef VMS_DEBUGGING_INFO
4418 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4419 debug_hooks = &vmsdbg_debug_hooks;
4422 error ("target system does not support the \"%s\" debug format",
4423 debug_type_names[write_symbols]);
4425 /* If auxiliary info generation is desired, open the output file.
4426 This goes in the same directory as the source file--unlike
4427 all the other output files. */
4428 if (flag_gen_aux_info)
4430 aux_info_file = fopen (aux_info_file_name, "w");
4431 if (aux_info_file == 0)
4432 fatal_error ("can't open %s: %m", aux_info_file_name);
4435 if (! targetm.have_named_sections)
4437 if (flag_function_sections)
4439 warning ("-ffunction-sections not supported for this target");
4440 flag_function_sections = 0;
4442 if (flag_data_sections)
4444 warning ("-fdata-sections not supported for this target");
4445 flag_data_sections = 0;
4449 if (flag_function_sections && profile_flag)
4451 warning ("-ffunction-sections disabled; it makes profiling impossible");
4452 flag_function_sections = 0;
4455 #ifndef HAVE_prefetch
4456 if (flag_prefetch_loop_arrays)
4458 warning ("-fprefetch-loop-arrays not supported for this target");
4459 flag_prefetch_loop_arrays = 0;
4462 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4464 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4465 flag_prefetch_loop_arrays = 0;
4469 /* This combination of options isn't handled for i386 targets and doesn't
4470 make much sense anyway, so don't allow it. */
4471 if (flag_prefetch_loop_arrays && optimize_size)
4473 warning ("-fprefetch-loop-arrays is not supported with -Os");
4474 flag_prefetch_loop_arrays = 0;
4477 #ifndef OBJECT_FORMAT_ELF
4478 if (flag_function_sections && write_symbols != NO_DEBUG)
4479 warning ("-ffunction-sections may affect debugging on some targets");
4482 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4483 if (flag_signaling_nans)
4484 flag_trapping_math = 1;
4487 /* Initialize the compiler back end. */
4491 init_adjust_machine_modes ();
4493 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4494 || debug_info_level == DINFO_LEVEL_VERBOSE
4495 #ifdef VMS_DEBUGGING_INFO
4496 /* Enable line number info for traceback. */
4497 || debug_info_level > DINFO_LEVEL_NONE
4499 || flag_test_coverage
4500 || warn_notreached);
4503 init_fake_stack_mems ();
4507 init_function_once ();
4508 init_varasm_once ();
4510 /* The following initialization functions need to generate rtl, so
4511 provide a dummy function context for them. */
4512 init_dummy_function_start ();
4514 if (flag_caller_saves)
4515 init_caller_save ();
4516 expand_dummy_function_end ();
4519 /* Language-dependent initialization. Returns nonzero on success. */
4521 lang_dependent_init (const char *name)
4523 if (dump_base_name == 0)
4524 dump_base_name = name ? name : "gccdump";
4526 /* Other front-end initialization. */
4527 if ((*lang_hooks.init) () == 0)
4530 init_asm_output (name);
4532 /* These create various _DECL nodes, so need to be called after the
4533 front end is initialized. */
4537 /* The following initialization functions need to generate rtl, so
4538 provide a dummy function context for them. */
4539 init_dummy_function_start ();
4541 expand_dummy_function_end ();
4543 /* If dbx symbol table desired, initialize writing it and output the
4544 predefined types. */
4545 timevar_push (TV_SYMOUT);
4547 #ifdef DWARF2_UNWIND_INFO
4548 if (dwarf2out_do_frame ())
4549 dwarf2out_frame_init ();
4552 /* Now we have the correct original filename, we can initialize
4554 (*debug_hooks->init) (name);
4556 timevar_pop (TV_SYMOUT);
4561 /* Clean up: close opened files, etc. */
4566 /* Close the dump files. */
4567 if (flag_gen_aux_info)
4569 fclose (aux_info_file);
4571 unlink (aux_info_file_name);
4574 /* Close non-debugging input and output files. Take special care to note
4575 whether fclose returns an error, since the pages might still be on the
4576 buffer chain while the file is open. */
4580 if (ferror (asm_out_file) != 0)
4581 fatal_error ("error writing to %s: %m", asm_file_name);
4582 if (fclose (asm_out_file) != 0)
4583 fatal_error ("error closing %s: %m", asm_file_name);
4586 /* Do whatever is necessary to finish printing the graphs. */
4587 if (graph_dump_format != no_graph)
4591 for (i = 0; i < (int) DFI_MAX; ++i)
4592 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4597 sprintf (seq, DUMPFILE_FORMAT, i);
4598 suffix = concat (seq, dump_file[i].extension, NULL);
4599 finish_graph_dump_file (dump_base_name, suffix);
4606 ggc_print_statistics ();
4607 stringpool_statistics ();
4608 dump_tree_statistics ();
4609 dump_rtx_statistics ();
4610 dump_varray_statistics ();
4611 dump_alloc_pool_statistics ();
4614 /* Free up memory for the benefit of leak detectors. */
4617 /* Language-specific end of compilation actions. */
4618 (*lang_hooks.finish) ();
4621 /* Initialize the compiler, and compile the input file. */
4625 /* Initialize timing first. The C front ends read the main file in
4626 the post_options hook, and C++ does file timings. */
4627 if (time_report || !quiet_flag || flag_detailed_statistics)
4629 timevar_start (TV_TOTAL);
4633 /* Don't do any more if an error has already occurred. */
4636 /* Set up the back-end if requested. */
4640 /* Language-dependent initialization. Returns true on success. */
4641 if (lang_dependent_init (main_input_filename))
4643 if (flag_unit_at_a_time)
4645 open_dump_file (DFI_cgraph, NULL);
4646 cgraph_dump_file = rtl_dump_file;
4647 rtl_dump_file = NULL;
4652 if (flag_unit_at_a_time)
4654 rtl_dump_file = cgraph_dump_file;
4655 cgraph_dump_file = NULL;
4656 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4663 /* Stop timing and print the times. */
4664 timevar_stop (TV_TOTAL);
4665 timevar_print (stderr);
4668 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4669 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4670 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4672 It is not safe to call this function more than once. */
4675 toplev_main (unsigned int argc, const char **argv)
4679 /* Initialization of GCC's environment, and diagnostics. */
4680 general_init (argv[0]);
4682 /* Parse the options and do minimal processing; basically just
4683 enough to default flags appropriately. */
4684 decode_options (argc, argv);
4688 /* Exit early if we can (e.g. -help). */
4689 if (!exit_after_options)
4692 if (errorcount || sorrycount)
4693 return (FATAL_EXIT_CODE);
4695 return (SUCCESS_EXIT_CODE);