1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_HYDROGEN_CHECK_ELIMINATION_H_ 29#define V8_HYDROGEN_CHECK_ELIMINATION_H_ 30 31#include "hydrogen.h" 32#include "hydrogen-alias-analysis.h" 33 34namespace v8 { 35namespace internal { 36 37 38// Remove CheckMaps instructions through flow- and branch-sensitive analysis. 39class HCheckEliminationPhase : public HPhase { 40 public: 41 explicit HCheckEliminationPhase(HGraph* graph) 42 : HPhase("H_Check Elimination", graph), aliasing_() { 43#ifdef DEBUG 44 redundant_ = 0; 45 removed_ = 0; 46 removed_cho_ = 0; 47 narrowed_ = 0; 48 loads_ = 0; 49 empty_ = 0; 50 compares_true_ = 0; 51 compares_false_ = 0; 52 transitions_ = 0; 53#endif 54 } 55 56 void Run(); 57 58 friend class HCheckTable; 59 60 private: 61 void PrintStats(); 62 63 HAliasAnalyzer* aliasing_; 64#ifdef DEBUG 65 int redundant_; 66 int removed_; 67 int removed_cho_; 68 int narrowed_; 69 int loads_; 70 int empty_; 71 int compares_true_; 72 int compares_false_; 73 int transitions_; 74#endif 75}; 76 77 78} } // namespace v8::internal 79 80#endif // V8_HYDROGEN_CHECK_ELIMINATION_H_ 81