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_OSR_H_ 29 #define V8_HYDROGEN_OSR_H_ 30 31 #include "hydrogen.h" 32 #include "ast.h" 33 #include "zone.h" 34 35 namespace v8 { 36 namespace internal { 37 38 // Responsible for building graph parts related to OSR and otherwise 39 // setting up the graph to do an OSR compile. 40 class HOsrBuilder : public ZoneObject { 41 public: HOsrBuilder(HOptimizedGraphBuilder * builder)42 explicit HOsrBuilder(HOptimizedGraphBuilder* builder) 43 : unoptimized_frame_slots_(0), 44 builder_(builder), 45 osr_entry_(NULL), 46 osr_loop_entry_(NULL), 47 osr_values_(NULL) { } 48 49 // Creates the loop entry block for the given statement, setting up OSR 50 // entries as necessary, and sets the current block to the new block. 51 HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement); 52 53 // Process the hydrogen graph after it has been completed, performing 54 // any OSR-specific cleanups or changes. 55 void FinishGraph(); 56 57 // Process the OSR values and phis after initial graph optimization. 58 void FinishOsrValues(); 59 60 // Return the number of slots in the unoptimized frame at the entry to OSR. UnoptimizedFrameSlots()61 int UnoptimizedFrameSlots() const { 62 return unoptimized_frame_slots_; 63 } 64 65 bool HasOsrEntryAt(IterationStatement* statement); 66 67 private: 68 int unoptimized_frame_slots_; 69 HOptimizedGraphBuilder* builder_; 70 HBasicBlock* osr_entry_; 71 HBasicBlock* osr_loop_entry_; 72 ZoneList<HUnknownOSRValue*>* osr_values_; 73 }; 74 75 } } // namespace v8::internal 76 77 #endif // V8_HYDROGEN_OSR_H_ 78