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

src/hydrogen-environment-liveness.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
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_HYDROGEN_ENVIRONMENT_LIVENESS_H_
-#define V8_HYDROGEN_ENVIRONMENT_LIVENESS_H_
-
-
-#include "hydrogen.h"
-
-namespace v8 {
-namespace internal {
-
-
-// Trims live ranges of environment slots by doing explicit liveness analysis.
-// Values in the environment are kept alive by every subsequent LInstruction
-// that is assigned an LEnvironment, which creates register pressure and
-// unnecessary spill slot moves. Therefore it is beneficial to trim the
-// live ranges of environment slots by zapping them with a constant after
-// the last lookup that refers to them.
-// Slots are identified by their index and only affected if whitelisted in
-// HOptimizedGraphBuilder::IsEligibleForEnvironmentLivenessAnalysis().
-class HEnvironmentLivenessAnalysisPhase : public HPhase {
- public:
-  explicit HEnvironmentLivenessAnalysisPhase(HGraph* graph);
-
-  void Run();
-
- private:
-  void ZapEnvironmentSlot(int index, HSimulate* simulate);
-  void ZapEnvironmentSlotsInSuccessors(HBasicBlock* block, BitVector* live);
-  void ZapEnvironmentSlotsForInstruction(HEnvironmentMarker* marker);
-  void UpdateLivenessAtBlockEnd(HBasicBlock* block, BitVector* live);
-  void UpdateLivenessAtInstruction(HInstruction* instr, BitVector* live);
-
-  int block_count_;
-
-  // Largest number of local variables in any environment in the graph
-  // (including inlined environments).
-  int maximum_environment_size_;
-
-  // Per-block data. All these lists are indexed by block_id.
-  ZoneList<BitVector*> live_at_block_start_;
-  ZoneList<HSimulate*> first_simulate_;
-  ZoneList<BitVector*> first_simulate_invalid_for_index_;
-
-  // List of all HEnvironmentMarker instructions for quick iteration/deletion.
-  // It is populated during the first pass over the graph, controlled by
-  // |collect_markers_|.
-  ZoneList<HEnvironmentMarker*> markers_;
-  bool collect_markers_;
-
-  // Keeps track of the last simulate seen, as well as the environment slots
-  // for which a new live range has started since (so they must not be zapped
-  // in that simulate when the end of another live range of theirs is found).
-  HSimulate* last_simulate_;
-  BitVector went_live_since_last_simulate_;
-
-  DISALLOW_COPY_AND_ASSIGN(HEnvironmentLivenessAnalysisPhase);
-};
-
-
-} }  // namespace v8::internal
-
-#endif /* V8_HYDROGEN_ENVIRONMENT_LIVENESS_H_ */