1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_CRANKSHAFT_HYDROGEN_OSR_H_ 6 #define V8_CRANKSHAFT_HYDROGEN_OSR_H_ 7 8 #include "src/crankshaft/hydrogen.h" 9 #include "src/zone/zone.h" 10 11 namespace v8 { 12 namespace internal { 13 14 class IterationStatement; 15 16 // Responsible for building graph parts related to OSR and otherwise 17 // setting up the graph to do an OSR compile. 18 class HOsrBuilder : public ZoneObject { 19 public: HOsrBuilder(HOptimizedGraphBuilder * builder)20 explicit HOsrBuilder(HOptimizedGraphBuilder* builder) 21 : unoptimized_frame_slots_(0), 22 builder_(builder), 23 osr_entry_(NULL), 24 osr_loop_entry_(NULL), 25 osr_values_(NULL) { } 26 27 // Creates the loop entry block for the given statement, setting up OSR 28 // entries as necessary, and sets the current block to the new block. 29 HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement); 30 31 // Process the hydrogen graph after it has been completed, performing 32 // any OSR-specific cleanups or changes. 33 void FinishGraph(); 34 35 // Process the OSR values and phis after initial graph optimization. 36 void FinishOsrValues(); 37 38 // Return the number of slots in the unoptimized frame at the entry to OSR. UnoptimizedFrameSlots()39 int UnoptimizedFrameSlots() const { 40 return unoptimized_frame_slots_; 41 } 42 43 bool HasOsrEntryAt(IterationStatement* statement); 44 45 private: 46 int unoptimized_frame_slots_; 47 HOptimizedGraphBuilder* builder_; 48 HBasicBlock* osr_entry_; 49 HBasicBlock* osr_loop_entry_; 50 ZoneList<HUnknownOSRValue*>* osr_values_; 51 }; 52 53 } // namespace internal 54 } // namespace v8 55 56 #endif // V8_CRANKSHAFT_HYDROGEN_OSR_H_ 57