gcc/passes.c

   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, 2005 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   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
  10 version.
  11
  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
  15 for more details.
  16
  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, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  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.  */
  26
  27 #include "config.h"
  28 #undef FLOAT /* This is for hpux. They should change hpux.  */
  29 #undef FFS  /* Some systems define this in param.h.  */
  30 #include "system.h"
  31 #include "coretypes.h"
  32 #include "tm.h"
  33 #include <signal.h>
  34
  35 #ifdef HAVE_SYS_RESOURCE_H
  36 # include <sys/resource.h>
  37 #endif
  38
  39 #ifdef HAVE_SYS_TIMES_H
  40 # include <sys/times.h>
  41 #endif
  42
  43 #include "line-map.h"
  44 #include "input.h"
  45 #include "tree.h"
  46 #include "rtl.h"
  47 #include "tm_p.h"
  48 #include "flags.h"
  49 #include "insn-attr.h"
  50 #include "insn-config.h"
  51 #include "insn-flags.h"
  52 #include "hard-reg-set.h"
  53 #include "recog.h"
  54 #include "output.h"
  55 #include "except.h"
  56 #include "function.h"
  57 #include "toplev.h"
  58 #include "expr.h"
  59 #include "basic-block.h"
  60 #include "intl.h"
  61 #include "ggc.h"
  62 #include "graph.h"
  63 #include "regs.h"
  64 #include "timevar.h"
  65 #include "diagnostic.h"
  66 #include "params.h"
  67 #include "reload.h"
  68 #include "dwarf2asm.h"
  69 #include "integrate.h"
  70 #include "real.h"
  71 #include "debug.h"
  72 #include "target.h"
  73 #include "langhooks.h"
  74 #include "cfglayout.h"
  75 #include "cfgloop.h"
  76 #include "hosthooks.h"
  77 #include "cgraph.h"
  78 #include "opts.h"
  79 #include "coverage.h"
  80 #include "value-prof.h"
  81 #include "tree-inline.h"
  82 #include "tree-flow.h"
  83 #include "tree-pass.h"
  84 #include "tree-dump.h"
  85
  86 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
  87 #include "dwarf2out.h"
  88 #endif
  89
  90 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
  91 #include "dbxout.h"
  92 #endif
  93
  94 #ifdef SDB_DEBUGGING_INFO
  95 #include "sdbout.h"
  96 #endif
  97
  98 #ifdef XCOFF_DEBUGGING_INFO
  99 #include "xcoffout.h"           /* Needed for external data
 100                                    declarations for e.g. AIX 4.x.  */
 101 #endif
 102
 103 /* Global variables used to communicate with passes.  */
 104 int dump_flags;
 105 bool in_gimple_form;
 106
 107
 108 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
 109    and TYPE_DECL nodes.
 110
 111    This does nothing for local (non-static) variables, unless the
 112    variable is a register variable with DECL_ASSEMBLER_NAME set.  In
 113    that case, or if the variable is not an automatic, it sets up the
 114    RTL and outputs any assembler code (label definition, storage
 115    allocation and initialization).
 116
 117    DECL is the declaration.  TOP_LEVEL is nonzero
 118    if this declaration is not within a function.  */
 119
 120 void
 121 rest_of_decl_compilation (tree decl,
 122                           int top_level,
 123                           int at_end)
 124 {
 125   /* We deferred calling assemble_alias so that we could collect
 126      other attributes such as visibility.  Emit the alias now.  */
 127   {
 128     tree alias;
 129     alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
 130     if (alias)
 131       {
 132         alias = TREE_VALUE (TREE_VALUE (alias));
 133         alias = get_identifier (TREE_STRING_POINTER (alias));
 134         assemble_alias (decl, alias);
 135       }
 136   }
 137
 138   /* Can't defer this, because it needs to happen before any
 139      later function definitions are processed.  */
 140   if (DECL_ASSEMBLER_NAME_SET_P (decl) && DECL_REGISTER (decl))
 141     make_decl_rtl (decl);
 142
 143   /* Forward declarations for nested functions are not "external",
 144      but we need to treat them as if they were.  */
 145   if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
 146       || TREE_CODE (decl) == FUNCTION_DECL)
 147     {
 148       timevar_push (TV_VARCONST);
 149
 150       /* Don't output anything when a tentative file-scope definition
 151          is seen.  But at end of compilation, do output code for them.
 152
 153          We do output all variables when unit-at-a-time is active and rely on
 154          callgraph code to defer them except for forward declarations
 155          (see gcc.c-torture/compile/920624-1.c) */
 156       if ((at_end
 157            || !DECL_DEFER_OUTPUT (decl)
 158            || DECL_INITIAL (decl))
 159           && !DECL_EXTERNAL (decl))
 160         {
 161           if (TREE_CODE (decl) != FUNCTION_DECL)
 162             cgraph_varpool_finalize_decl (decl);
 163           else
 164             assemble_variable (decl, top_level, at_end, 0);
 165         }
 166
 167 #ifdef ASM_FINISH_DECLARE_OBJECT
 168       if (decl == last_assemble_variable_decl)
 169         {
 170           ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
 171                                      top_level, at_end);
 172         }
 173 #endif
 174
 175       timevar_pop (TV_VARCONST);
 176     }
 177   else if (TREE_CODE (decl) == TYPE_DECL
 178            /* Like in rest_of_type_compilation, avoid confusing the debug
 179               information machinery when there are errors.  */
 180            && !(sorrycount || errorcount))
 181     {
 182       timevar_push (TV_SYMOUT);
 183       debug_hooks->type_decl (decl, !top_level);
 184       timevar_pop (TV_SYMOUT);
 185     }
 186
 187   /* Let cgraph know about the existence of variables.  */
 188   if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
 189     cgraph_varpool_node (decl);
 190 }
 191
 192 /* Called after finishing a record, union or enumeral type.  */
 193
 194 void
 195 rest_of_type_compilation (tree type, int toplev)
 196 {
 197   /* Avoid confusing the debug information machinery when there are
 198      errors.  */
 199   if (errorcount != 0 || sorrycount != 0)
 200     return;
 201
 202   timevar_push (TV_SYMOUT);
 203   debug_hooks->type_decl (TYPE_STUB_DECL (type), !toplev);
 204   timevar_pop (TV_SYMOUT);
 205 }
 206
 207 \f
 208
 209 void
 210 finish_optimization_passes (void)
 211 {
 212   enum tree_dump_index i;
 213   struct dump_file_info *dfi;
 214   char *name;
 215
 216   timevar_push (TV_DUMP);
 217   if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
 218     {
 219       dump_file = dump_begin (pass_branch_prob.static_pass_number, NULL);
 220       end_branch_prob ();
 221       if (dump_file)
 222         dump_end (pass_branch_prob.static_pass_number, dump_file);
 223     }
 224
 225   if (optimize > 0)
 226     {
 227       dump_file = dump_begin (pass_combine.static_pass_number, NULL);
 228       if (dump_file)
 229         {
 230           dump_combine_total_stats (dump_file);
 231           dump_end (pass_combine.static_pass_number, dump_file);
 232         }
 233     }
 234
 235   /* Do whatever is necessary to finish printing the graphs.  */
 236   if (graph_dump_format != no_graph)
 237     for (i = TDI_end; (dfi = get_dump_file_info (i)) != NULL; ++i)
 238       if (dump_initialized_p (i)
 239           && (dfi->flags & TDF_GRAPH) != 0
 240           && (name = get_dump_file_name (i)) != NULL)
 241         {
 242           finish_graph_dump_file (name);
 243           free (name);
 244         }
 245
 246   timevar_pop (TV_DUMP);
 247 }
 248
 249 static bool
 250 gate_rest_of_compilation (void)
 251 {
 252   /* Early return if there were errors.  We can run afoul of our
 253      consistency checks, and there's not really much point in fixing them.  */
 254   return !(rtl_dump_and_exit || flag_syntax_only || errorcount || sorrycount);
 255 }
 256
 257 struct tree_opt_pass pass_rest_of_compilation =
 258 {
 259   NULL,                                 /* name */
 260   gate_rest_of_compilation,             /* gate */
 261   NULL,                                 /* execute */
 262   NULL,                                 /* sub */
 263   NULL,                                 /* next */
 264   0,                                    /* static_pass_number */
 265   TV_REST_OF_COMPILATION,               /* tv_id */
 266   PROP_rtl,                             /* properties_required */
 267   0,                                    /* properties_provided */
 268   0,                                    /* properties_destroyed */
 269   0,                                    /* todo_flags_start */
 270   TODO_ggc_collect,                     /* todo_flags_finish */
 271   0                                     /* letter */
 272 };
 273
 274 static bool
 275 gate_postreload (void)
 276 {
 277   return reload_completed;
 278 }
 279
 280 struct tree_opt_pass pass_postreload =
 281 {
 282   NULL,                                 /* name */
 283   gate_postreload,                      /* gate */
 284   NULL,                                 /* execute */
 285   NULL,                                 /* sub */
 286   NULL,                                 /* next */
 287   0,                                    /* static_pass_number */
 288   0,                                    /* tv_id */
 289   PROP_rtl,                             /* properties_required */
 290   0,                                    /* properties_provided */
 291   0,                                    /* properties_destroyed */
 292   0,                                    /* todo_flags_start */
 293   TODO_ggc_collect,                     /* todo_flags_finish */
 294   0                                     /* letter */
 295 };
 296
 297
 298
 299 /* The root of the compilation pass tree, once constructed.  */
 300 struct tree_opt_pass *all_passes, *all_ipa_passes, *all_lowering_passes;
 301
 302 /* Iterate over the pass tree allocating dump file numbers.  We want
 303    to do this depth first, and independent of whether the pass is
 304    enabled or not.  */
 305
 306 static void
 307 register_one_dump_file (struct tree_opt_pass *pass, bool ipa, int n)
 308 {
 309   char *dot_name, *flag_name, *glob_name;
 310   char num[10];
 311
 312   /* See below in next_pass_1.  */
 313   num[0] = '\0';
 314   if (pass->static_pass_number != -1)
 315     sprintf (num, "%d", ((int) pass->static_pass_number < 0
 316                          ? 1 : pass->static_pass_number));
 317
 318   dot_name = concat (".", pass->name, num, NULL);
 319   if (ipa)
 320     {
 321       flag_name = concat ("ipa-", pass->name, num, NULL);
 322       glob_name = concat ("ipa-", pass->name, NULL);
 323       /* First IPA dump is cgraph that is dumped via separate channels.  */
 324       pass->static_pass_number = dump_register (dot_name, flag_name, glob_name,
 325                                                 TDF_IPA, n + 1, 0);
 326     }
 327   else if (pass->properties_provided & PROP_trees)
 328     {
 329       flag_name = concat ("tree-", pass->name, num, NULL);
 330       glob_name = concat ("tree-", pass->name, NULL);
 331       pass->static_pass_number = dump_register (dot_name, flag_name, glob_name,
 332                                                 TDF_TREE, n + TDI_tree_all, 0);
 333     }
 334   else
 335     {
 336       flag_name = concat ("rtl-", pass->name, num, NULL);
 337       glob_name = concat ("rtl-", pass->name, NULL);
 338       pass->static_pass_number = dump_register (dot_name, flag_name, glob_name,
 339                                                 TDF_RTL, n, pass->letter);
 340     }
 341 }
 342
 343 static int
 344 register_dump_files (struct tree_opt_pass *pass, bool ipa, int properties)
 345 {
 346   static int n = 0;
 347   do
 348     {
 349       int new_properties;
 350       int pass_number;
 351
 352       pass->properties_required = properties;
 353       new_properties =
 354         (properties | pass->properties_provided) & ~pass->properties_destroyed;
 355
 356       /* Reset the counter when we reach RTL-based passes.  */
 357       if ((new_properties ^ pass->properties_required) & PROP_rtl)
 358         n = 0;
 359
 360       pass_number = n;
 361       if (pass->name)
 362         n++;
 363
 364       if (pass->sub)
 365         new_properties = register_dump_files (pass->sub, false, new_properties);
 366
 367       /* If we have a gate, combine the properties that we could have with
 368          and without the pass being examined.  */
 369       if (pass->gate)
 370         properties &= new_properties;
 371       else
 372         properties = new_properties;
 373
 374       pass->properties_provided = properties;
 375       if (pass->name)
 376         register_one_dump_file (pass, ipa, pass_number);
 377
 378       pass = pass->next;
 379     }
 380   while (pass);
 381
 382   return properties;
 383 }
 384
 385 /* Add a pass to the pass list. Duplicate the pass if it's already
 386    in the list.  */
 387
 388 static struct tree_opt_pass **
 389 next_pass_1 (struct tree_opt_pass **list, struct tree_opt_pass *pass)
 390 {
 391
 392   /* A nonzero static_pass_number indicates that the
 393      pass is already in the list.  */
 394   if (pass->static_pass_number)
 395     {
 396       struct tree_opt_pass *new;
 397
 398       new = xmalloc (sizeof (*new));
 399       memcpy (new, pass, sizeof (*new));
 400
 401       /* Indicate to register_dump_files that this pass has duplicates,
 402          and so it should rename the dump file.  The first instance will
 403          be -1, and be number of duplicates = -static_pass_number - 1.
 404          Subsequent instances will be > 0 and just the duplicate number.  */
 405       if (pass->name)
 406         {
 407           pass->static_pass_number -= 1;
 408           new->static_pass_number = -pass->static_pass_number;
 409         }
 410
 411       *list = new;
 412     }
 413   else
 414     {
 415       pass->static_pass_number = -1;
 416       *list = pass;
 417     }
 418
 419   return &(*list)->next;
 420
 421 }
 422
 423 /* Construct the pass tree.  The sequencing of passes is driven by
 424    the cgraph routines:
 425
 426    cgraph_finalize_compilation_unit ()
 427        for each node N in the cgraph
 428            cgraph_analyze_function (N)
 429                cgraph_lower_function (N) -> all_lowering_passes
 430
 431    If we are optimizing, cgraph_optimize is then invoked:
 432
 433    cgraph_optimize ()
 434        ipa_passes ()                    -> all_ipa_passes
 435        cgraph_expand_all_functions ()
 436            for each node N in the cgraph
 437                cgraph_expand_function (N)
 438                    cgraph_lower_function (N)    -> Now a NOP.
 439                    lang_hooks.callgraph.expand_function (DECL (N))
 440                         tree_rest_of_compilation (DECL (N))  -> all_passes
 441 */
 442
 443 void
 444 init_optimization_passes (void)
 445 {
 446   struct tree_opt_pass **p;
 447
 448 #define NEXT_PASS(PASS)  (p = next_pass_1 (p, &PASS))
 449   /* Interprocedural optimization passes.  */
 450   p = &all_ipa_passes;
 451   NEXT_PASS (pass_early_ipa_inline);
 452   NEXT_PASS (pass_early_local_passes);
 453   NEXT_PASS (pass_ipa_cp);
 454   NEXT_PASS (pass_ipa_inline);
 455   NEXT_PASS (pass_ipa_reference);
 456   NEXT_PASS (pass_ipa_pure_const);
 457   NEXT_PASS (pass_ipa_type_escape);
 458   *p = NULL;
 459
 460   /* All passes needed to lower the function into shape optimizers can
 461      operate on.  */
 462   p = &all_lowering_passes;
 463   NEXT_PASS (pass_remove_useless_stmts);
 464   NEXT_PASS (pass_mudflap_1);
 465   NEXT_PASS (pass_lower_cf);
 466   NEXT_PASS (pass_lower_eh);
 467   NEXT_PASS (pass_build_cfg);
 468   NEXT_PASS (pass_lower_complex_O0);
 469   NEXT_PASS (pass_lower_vector);
 470   NEXT_PASS (pass_warn_function_return);
 471   NEXT_PASS (pass_early_tree_profile);
 472   *p = NULL;
 473
 474   p = &pass_early_local_passes.sub;
 475   NEXT_PASS (pass_tree_profile);
 476   NEXT_PASS (pass_cleanup_cfg);
 477   NEXT_PASS (pass_rebuild_cgraph_edges);
 478   *p = NULL;
 479
 480   p = &all_passes;
 481   NEXT_PASS (pass_fixup_cfg);
 482   NEXT_PASS (pass_init_datastructures);
 483   NEXT_PASS (pass_all_optimizations);
 484   NEXT_PASS (pass_warn_function_noreturn);
 485   NEXT_PASS (pass_mudflap_2);
 486   NEXT_PASS (pass_free_datastructures);
 487   NEXT_PASS (pass_free_cfg_annotations);
 488   NEXT_PASS (pass_expand);
 489   NEXT_PASS (pass_rest_of_compilation);
 490   NEXT_PASS (pass_clean_state);
 491   *p = NULL;
 492
 493   p = &pass_all_optimizations.sub;
 494   NEXT_PASS (pass_referenced_vars);
 495   NEXT_PASS (pass_create_structure_vars);
 496   NEXT_PASS (pass_build_ssa);
 497   NEXT_PASS (pass_may_alias);
 498   NEXT_PASS (pass_return_slot);
 499   NEXT_PASS (pass_rename_ssa_copies);
 500   NEXT_PASS (pass_early_warn_uninitialized);
 501   NEXT_PASS (pass_eliminate_useless_stores);
 502
 503   /* Initial scalar cleanups.  */
 504   NEXT_PASS (pass_ccp);
 505   NEXT_PASS (pass_fre);
 506   NEXT_PASS (pass_dce);
 507   NEXT_PASS (pass_forwprop);
 508   NEXT_PASS (pass_copy_prop);
 509   NEXT_PASS (pass_vrp);
 510   NEXT_PASS (pass_dce);
 511   NEXT_PASS (pass_merge_phi);
 512   NEXT_PASS (pass_dominator);
 513
 514   /* The only copy propagation opportunities left after DOM
 515      should be due to degenerate PHI nodes.  So rather than
 516      run the full copy propagator, just discover and copy
 517      propagate away the degenerate PHI nodes.  */
 518   NEXT_PASS (pass_phi_only_copy_prop);
 519
 520   NEXT_PASS (pass_phiopt);
 521   NEXT_PASS (pass_may_alias);
 522   NEXT_PASS (pass_tail_recursion);
 523   NEXT_PASS (pass_profile);
 524   NEXT_PASS (pass_ch);
 525   NEXT_PASS (pass_stdarg);
 526   NEXT_PASS (pass_lower_complex);
 527   NEXT_PASS (pass_sra);
 528   /* FIXME: SRA may generate arbitrary gimple code, exposing new
 529      aliased and call-clobbered variables.  As mentioned below,
 530      pass_may_alias should be a TODO item.  */
 531   NEXT_PASS (pass_may_alias);
 532   NEXT_PASS (pass_rename_ssa_copies);
 533   NEXT_PASS (pass_dominator);
 534
 535   /* The only copy propagation opportunities left after DOM
 536      should be due to degenerate PHI nodes.  So rather than
 537      run the full copy propagator, just discover and copy
 538      propagate away the degenerate PHI nodes.  */
 539   NEXT_PASS (pass_phi_only_copy_prop);
 540
 541   NEXT_PASS (pass_dce);
 542   NEXT_PASS (pass_dse);
 543   NEXT_PASS (pass_may_alias);
 544   NEXT_PASS (pass_forwprop);
 545   NEXT_PASS (pass_phiopt);
 546   NEXT_PASS (pass_object_sizes);
 547   NEXT_PASS (pass_store_ccp);
 548   NEXT_PASS (pass_store_copy_prop);
 549   NEXT_PASS (pass_fold_builtins);
 550   /* FIXME: May alias should a TODO but for 4.0.0,
 551      we add may_alias right after fold builtins
 552      which can create arbitrary GIMPLE.  */
 553   NEXT_PASS (pass_may_alias);
 554   NEXT_PASS (pass_cse_reciprocals);
 555   NEXT_PASS (pass_split_crit_edges);
 556   NEXT_PASS (pass_reassoc);
 557   NEXT_PASS (pass_pre);
 558   NEXT_PASS (pass_sink_code);
 559   NEXT_PASS (pass_tree_loop);
 560   NEXT_PASS (pass_dominator);
 561
 562   /* The only copy propagation opportunities left after DOM
 563      should be due to degenerate PHI nodes.  So rather than
 564      run the full copy propagator, just discover and copy
 565      propagate away the degenerate PHI nodes.  */
 566   NEXT_PASS (pass_phi_only_copy_prop);
 567
 568   NEXT_PASS (pass_cd_dce);
 569
 570   /* FIXME: If DCE is not run before checking for uninitialized uses,
 571      we may get false warnings (e.g., testsuite/gcc.dg/uninit-5.c).
 572      However, this also causes us to misdiagnose cases that should be
 573      real warnings (e.g., testsuite/gcc.dg/pr18501.c).
 574
 575      To fix the false positives in uninit-5.c, we would have to
 576      account for the predicates protecting the set and the use of each
 577      variable.  Using a representation like Gated Single Assignment
 578      may help.  */
 579   NEXT_PASS (pass_late_warn_uninitialized);
 580   NEXT_PASS (pass_dse);
 581   NEXT_PASS (pass_forwprop);
 582   NEXT_PASS (pass_phiopt);
 583   NEXT_PASS (pass_tail_calls);
 584   NEXT_PASS (pass_rename_ssa_copies);
 585   NEXT_PASS (pass_uncprop);
 586   NEXT_PASS (pass_del_ssa);
 587   NEXT_PASS (pass_nrv);
 588   NEXT_PASS (pass_remove_useless_vars);
 589   NEXT_PASS (pass_mark_used_blocks);
 590   NEXT_PASS (pass_cleanup_cfg_post_optimizing);
 591   *p = NULL;
 592
 593   p = &pass_tree_loop.sub;
 594   NEXT_PASS (pass_tree_loop_init);
 595   NEXT_PASS (pass_copy_prop);
 596   NEXT_PASS (pass_lim);
 597   NEXT_PASS (pass_tree_unswitch);
 598   NEXT_PASS (pass_scev_cprop);
 599   NEXT_PASS (pass_empty_loop);
 600   NEXT_PASS (pass_record_bounds);
 601   NEXT_PASS (pass_linear_transform);
 602   NEXT_PASS (pass_iv_canon);
 603   NEXT_PASS (pass_if_conversion);
 604   NEXT_PASS (pass_vectorize);
 605   /* NEXT_PASS (pass_may_alias) cannot be done again because the
 606      vectorizer creates alias relations that are not supported by
 607      pass_may_alias.  */
 608   NEXT_PASS (pass_complete_unroll);
 609   NEXT_PASS (pass_iv_optimize);
 610   NEXT_PASS (pass_tree_loop_done);
 611   *p = NULL;
 612
 613   p = &pass_vectorize.sub;
 614   NEXT_PASS (pass_lower_vector_ssa);
 615   NEXT_PASS (pass_dce_loop);
 616   *p = NULL;
 617
 618   p = &pass_loop2.sub;
 619   NEXT_PASS (pass_rtl_loop_init);
 620   NEXT_PASS (pass_rtl_move_loop_invariants);
 621   NEXT_PASS (pass_rtl_unswitch);
 622   NEXT_PASS (pass_rtl_unroll_and_peel_loops);
 623   NEXT_PASS (pass_rtl_doloop);
 624   NEXT_PASS (pass_rtl_loop_done);
 625   *p = NULL;
 626
 627   p = &pass_rest_of_compilation.sub;
 628   NEXT_PASS (pass_remove_unnecessary_notes);
 629   NEXT_PASS (pass_init_function);
 630   NEXT_PASS (pass_jump);
 631   NEXT_PASS (pass_insn_locators_initialize);
 632   NEXT_PASS (pass_rtl_eh);
 633   NEXT_PASS (pass_initial_value_sets);
 634   NEXT_PASS (pass_unshare_all_rtl);
 635   NEXT_PASS (pass_instantiate_virtual_regs);
 636   NEXT_PASS (pass_jump2);
 637   NEXT_PASS (pass_cse);
 638   NEXT_PASS (pass_gcse);
 639   NEXT_PASS (pass_loop_optimize);
 640   NEXT_PASS (pass_jump_bypass);
 641   NEXT_PASS (pass_cfg);
 642   NEXT_PASS (pass_branch_prob);
 643   NEXT_PASS (pass_rtl_ifcvt);
 644   NEXT_PASS (pass_tracer);
 645   /* Perform loop optimizations.  It might be better to do them a bit
 646      sooner, but we want the profile feedback to work more
 647      efficiently.  */
 648   NEXT_PASS (pass_loop2);
 649   NEXT_PASS (pass_web);
 650   NEXT_PASS (pass_cse2);
 651   NEXT_PASS (pass_life);
 652   NEXT_PASS (pass_combine);
 653   NEXT_PASS (pass_if_after_combine);
 654   NEXT_PASS (pass_partition_blocks);
 655   NEXT_PASS (pass_regmove);
 656   NEXT_PASS (pass_split_all_insns);
 657   NEXT_PASS (pass_mode_switching);
 658   NEXT_PASS (pass_recompute_reg_usage);
 659   NEXT_PASS (pass_sms);
 660   NEXT_PASS (pass_sched);
 661   NEXT_PASS (pass_local_alloc);
 662   NEXT_PASS (pass_global_alloc);
 663   NEXT_PASS (pass_postreload);
 664   *p = NULL;
 665
 666   p = &pass_postreload.sub;
 667   NEXT_PASS (pass_postreload_cse);
 668   NEXT_PASS (pass_gcse2);
 669   NEXT_PASS (pass_flow2);
 670   NEXT_PASS (pass_stack_adjustments);
 671   NEXT_PASS (pass_peephole2);
 672   NEXT_PASS (pass_if_after_reload);
 673   NEXT_PASS (pass_regrename);
 674   NEXT_PASS (pass_reorder_blocks);
 675   NEXT_PASS (pass_branch_target_load_optimize);
 676   NEXT_PASS (pass_leaf_regs);
 677   NEXT_PASS (pass_sched2);
 678   NEXT_PASS (pass_split_before_regstack);
 679   NEXT_PASS (pass_stack_regs);
 680   NEXT_PASS (pass_compute_alignments);
 681   NEXT_PASS (pass_duplicate_computed_gotos);
 682   NEXT_PASS (pass_variable_tracking);
 683   NEXT_PASS (pass_free_cfg);
 684   NEXT_PASS (pass_machine_reorg);
 685   NEXT_PASS (pass_purge_lineno_notes);
 686   NEXT_PASS (pass_cleanup_barriers);
 687   NEXT_PASS (pass_delay_slots);
 688   NEXT_PASS (pass_split_for_shorten_branches);
 689   NEXT_PASS (pass_convert_to_eh_region_ranges);
 690   NEXT_PASS (pass_shorten_branches);
 691   NEXT_PASS (pass_set_nothrow_function_flags);
 692   NEXT_PASS (pass_final);
 693   *p = NULL;
 694
 695 #undef NEXT_PASS
 696
 697   /* Register the passes with the tree dump code.  */
 698   register_dump_files (all_ipa_passes, true, PROP_gimple_leh | PROP_cfg);
 699   register_dump_files (all_lowering_passes, false, PROP_gimple_any);
 700   register_dump_files (all_passes, false, PROP_gimple_leh | PROP_cfg);
 701 }
 702
 703 static unsigned int last_verified;
 704
 705 static void
 706 execute_todo (struct tree_opt_pass *pass, unsigned int flags, bool use_required)
 707 {
 708   int properties
 709     = use_required ? pass->properties_required : pass->properties_provided;
 710
 711 #if defined ENABLE_CHECKING
 712   if (need_ssa_update_p ())
 713     gcc_assert (flags & TODO_update_ssa_any);
 714 #endif
 715
 716   /* Always cleanup the CFG before doing anything else.  */
 717   if (flags & TODO_cleanup_cfg)
 718     {
 719       if (current_loops)
 720         cleanup_tree_cfg_loop ();
 721       else
 722         cleanup_tree_cfg ();
 723
 724       /* When cleanup_tree_cfg merges consecutive blocks, it may
 725          perform some simplistic propagation when removing single
 726          valued PHI nodes.  This propagation may, in turn, cause the
 727          SSA form to become out-of-date (see PR 22037).  So, even
 728          if the parent pass had not scheduled an SSA update, we may
 729          still need to do one.  */
 730       if (!(flags & TODO_update_ssa_any) && need_ssa_update_p ())
 731         flags |= TODO_update_ssa;
 732     }
 733
 734   if (flags & TODO_update_ssa_any)
 735     {
 736       unsigned update_flags = flags & TODO_update_ssa_any;
 737       update_ssa (update_flags);
 738     }
 739
 740   if ((flags & TODO_dump_func)
 741       && dump_file && current_function_decl)
 742     {
 743       if (properties & PROP_trees)
 744         dump_function_to_file (current_function_decl,
 745                                dump_file, dump_flags);
 746       else if (properties & PROP_cfg)
 747         {
 748           print_rtl_with_bb (dump_file, get_insns ());
 749
 750           if (graph_dump_format != no_graph
 751               && (dump_flags & TDF_GRAPH))
 752             print_rtl_graph_with_bb (dump_file_name, get_insns ());
 753         }
 754       else
 755         print_rtl (dump_file, get_insns ());
 756
 757       /* Flush the file.  If verification fails, we won't be able to
 758          close the file before aborting.  */
 759       fflush (dump_file);
 760     }
 761   if ((flags & TODO_dump_cgraph)
 762       && dump_file && !current_function_decl)
 763     {
 764       dump_cgraph (dump_file);
 765       /* Flush the file.  If verification fails, we won't be able to
 766          close the file before aborting.  */
 767       fflush (dump_file);
 768     }
 769
 770   if (flags & TODO_ggc_collect)
 771     {
 772       ggc_collect ();
 773     }
 774
 775 #if defined ENABLE_CHECKING
 776   if ((pass->properties_required & PROP_ssa)
 777       && !(pass->properties_destroyed & PROP_ssa))
 778     verify_ssa (true);
 779   if (flags & TODO_verify_flow)
 780     verify_flow_info ();
 781   if (flags & TODO_verify_stmts)
 782     verify_stmts ();
 783   if (flags & TODO_verify_loops)
 784     verify_loop_closed_ssa ();
 785 #endif
 786 }
 787
 788 static bool
 789 execute_one_pass (struct tree_opt_pass *pass)
 790 {
 791   unsigned int todo;
 792
 793   /* See if we're supposed to run this pass.  */
 794   if (pass->gate && !pass->gate ())
 795     return false;
 796
 797   /* Note that the folders should only create gimple expressions.
 798      This is a hack until the new folder is ready.  */
 799   in_gimple_form = (pass->properties_provided & PROP_trees) != 0;
 800
 801   /* Run pre-pass verification.  */
 802   todo = pass->todo_flags_start & ~last_verified;
 803   if (todo)
 804     execute_todo (pass, todo, true);
 805
 806   /* If a dump file name is present, open it if enabled.  */
 807   if (pass->static_pass_number != -1)
 808     {
 809       bool initializing_dump = !dump_initialized_p (pass->static_pass_number);
 810       dump_file_name = get_dump_file_name (pass->static_pass_number);
 811       dump_file = dump_begin (pass->static_pass_number, &dump_flags);
 812       if (dump_file && current_function_decl)
 813         {
 814           const char *dname, *aname;
 815           dname = lang_hooks.decl_printable_name (current_function_decl, 2);
 816           aname = (IDENTIFIER_POINTER
 817                    (DECL_ASSEMBLER_NAME (current_function_decl)));
 818           fprintf (dump_file, "\n;; Function %s (%s)%s\n\n", dname, aname,
 819              cfun->function_frequency == FUNCTION_FREQUENCY_HOT
 820              ? " (hot)"
 821              : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
 822              ? " (unlikely executed)"
 823              : "");
 824         }
 825
 826       if (initializing_dump
 827           && dump_file
 828           && graph_dump_format != no_graph
 829           && (pass->properties_provided & (PROP_cfg | PROP_rtl))
 830               == (PROP_cfg | PROP_rtl))
 831         {
 832           get_dump_file_info (pass->static_pass_number)->flags |= TDF_GRAPH;
 833           dump_flags |= TDF_GRAPH;
 834           clean_graph_dump_file (dump_file_name);
 835         }
 836     }
 837
 838   /* If a timevar is present, start it.  */
 839   if (pass->tv_id)
 840     timevar_push (pass->tv_id);
 841
 842   /* Do it!  */
 843   if (pass->execute)
 844     pass->execute ();
 845
 846   /* Stop timevar.  */
 847   if (pass->tv_id)
 848     timevar_pop (pass->tv_id);
 849
 850   /* Run post-pass cleanup and verification.  */
 851   todo = pass->todo_flags_finish;
 852   last_verified = todo & TODO_verify_all;
 853   if (todo)
 854     execute_todo (pass, todo, false);
 855
 856   /* Flush and close dump file.  */
 857   if (dump_file_name)
 858     {
 859       free ((char *) dump_file_name);
 860       dump_file_name = NULL;
 861     }
 862   if (dump_file)
 863     {
 864       dump_end (pass->static_pass_number, dump_file);
 865       dump_file = NULL;
 866     }
 867
 868   return true;
 869 }
 870
 871 void
 872 execute_pass_list (struct tree_opt_pass *pass)
 873 {
 874   do
 875     {
 876       if (execute_one_pass (pass) && pass->sub)
 877         execute_pass_list (pass->sub);
 878       pass = pass->next;
 879     }
 880   while (pass);
 881 }
 882
 883 /* Same as execute_pass_list but assume that subpasses of IPA passes
 884    are local passes.  */
 885 void
 886 execute_ipa_pass_list (struct tree_opt_pass *pass)
 887 {
 888   do
 889     {
 890       if (execute_one_pass (pass) && pass->sub)
 891         {
 892           struct cgraph_node *node;
 893           for (node = cgraph_nodes; node; node = node->next)
 894             if (node->analyzed)
 895               {
 896                 push_cfun (DECL_STRUCT_FUNCTION (node->decl));
 897                 current_function_decl = node->decl;
 898                 execute_pass_list (pass->sub);
 899                 free_dominance_info (CDI_DOMINATORS);
 900                 free_dominance_info (CDI_POST_DOMINATORS);
 901                 current_function_decl = NULL;
 902                 pop_cfun ();
 903                 ggc_collect ();
 904               }
 905         }
 906       pass = pass->next;
 907     }
 908   while (pass);
 909 }