1 // Copyright 2015 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_INTERPRETER_BYTECODE_REGISTER_ALLOCATOR_H_ 6 #define V8_INTERPRETER_BYTECODE_REGISTER_ALLOCATOR_H_ 7 8 #include "src/zone-containers.h" 9 10 namespace v8 { 11 namespace internal { 12 namespace interpreter { 13 14 class BytecodeArrayBuilder; 15 class Register; 16 17 // A class than allows the instantiator to allocate temporary registers that are 18 // cleaned up when scope is closed. 19 class BytecodeRegisterAllocator { 20 public: 21 explicit BytecodeRegisterAllocator(BytecodeArrayBuilder* builder); 22 ~BytecodeRegisterAllocator(); 23 Register NewRegister(); 24 25 void PrepareForConsecutiveAllocations(size_t count); 26 Register NextConsecutiveRegister(); 27 28 bool RegisterIsAllocatedInThisScope(Register reg) const; 29 30 bool HasConsecutiveAllocations() const { return next_consecutive_count_ > 0; } 31 32 private: 33 void* operator new(size_t size); 34 void operator delete(void* p); 35 36 BytecodeArrayBuilder* builder_; 37 ZoneVector<int> allocated_; 38 int next_consecutive_register_; 39 int next_consecutive_count_; 40 41 DISALLOW_COPY_AND_ASSIGN(BytecodeRegisterAllocator); 42 }; 43 44 } // namespace interpreter 45 } // namespace internal 46 } // namespace v8 47 48 49 #endif // V8_INTERPRETER_BYTECODE_REGISTER_ALLOCATOR_H_ 50
