Merge all Hydrogen phase declarations into hydrogen-phases.h.

src/hydrogen-gvn.h

-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_HYDROGEN_GVN_H_
-#define V8_HYDROGEN_GVN_H_
-
-#include "hydrogen.h"
-#include "hydrogen-instructions.h"
-#include "compiler.h"
-#include "zone.h"
-
-namespace v8 {
-namespace internal {
-
-// Perform common subexpression elimination and loop-invariant code motion.
-class HGlobalValueNumberingPhase : public HPhase {
- public:
-  explicit HGlobalValueNumberingPhase(HGraph* graph);
-
-  void Run() {
-    Analyze();
-    // Trigger a second analysis pass to further eliminate duplicate values
-    // that could only be discovered by removing side-effect-generating
-    // instructions during the first pass.
-    if (FLAG_smi_only_arrays && removed_side_effects_) {
-      Analyze();
-      ASSERT(!removed_side_effects_);
-    }
-  }
-
- private:
-  void Analyze();
-  GVNFlagSet CollectSideEffectsOnPathsToDominatedBlock(
-      HBasicBlock* dominator,
-      HBasicBlock* dominated);
-  void AnalyzeGraph();
-  void ComputeBlockSideEffects();
-  void LoopInvariantCodeMotion();
-  void ProcessLoopBlock(HBasicBlock* block,
-                        HBasicBlock* before_loop,
-                        GVNFlagSet loop_kills,
-                        GVNFlagSet* accumulated_first_time_depends,
-                        GVNFlagSet* accumulated_first_time_changes);
-  bool AllowCodeMotion();
-  bool ShouldMove(HInstruction* instr, HBasicBlock* loop_header);
-
-  bool removed_side_effects_;
-
-  // A map of block IDs to their side effects.
-  ZoneList<GVNFlagSet> block_side_effects_;
-
-  // A map of loop header block IDs to their loop's side effects.
-  ZoneList<GVNFlagSet> loop_side_effects_;
-
-  // Used when collecting side effects on paths from dominator to
-  // dominated.
-  BitVector visited_on_paths_;
-
-  DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase);
-};
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_HYDROGEN_GVN_H_