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_ARRAY_ITERATOR_H_ 6 #define V8_INTERPRETER_BYTECODE_ARRAY_ITERATOR_H_ 7 8 #include "src/handles.h" 9 #include "src/interpreter/bytecodes.h" 10 #include "src/objects.h" 11 #include "src/runtime/runtime.h" 12 13 namespace v8 { 14 namespace internal { 15 namespace interpreter { 16 17 class BytecodeArrayIterator { 18 public: 19 explicit BytecodeArrayIterator(Handle<BytecodeArray> bytecode_array); 20 21 void Advance(); 22 bool done() const; 23 Bytecode current_bytecode() const; 24 int current_bytecode_size() const; 25 int current_offset() const { return bytecode_offset_; } 26 OperandScale current_operand_scale() const { return operand_scale_; } 27 int current_prefix_offset() const { return prefix_offset_; } 28 const Handle<BytecodeArray>& bytecode_array() const { 29 return bytecode_array_; 30 } 31 32 uint32_t GetFlagOperand(int operand_index) const; 33 int32_t GetImmediateOperand(int operand_index) const; 34 uint32_t GetIndexOperand(int operand_index) const; 35 uint32_t GetRegisterCountOperand(int operand_index) const; 36 Register GetRegisterOperand(int operand_index) const; 37 int GetRegisterOperandRange(int operand_index) const; 38 Runtime::FunctionId GetRuntimeIdOperand(int operand_index) const; 39 Runtime::FunctionId GetIntrinsicIdOperand(int operand_index) const; 40 Handle<Object> GetConstantForIndexOperand(int operand_index) const; 41 42 // Returns the absolute offset of the branch target at the current 43 // bytecode. It is an error to call this method if the bytecode is 44 // not for a jump or conditional jump. 45 int GetJumpTargetOffset() const; 46 47 private: 48 uint32_t GetUnsignedOperand(int operand_index, 49 OperandType operand_type) const; 50 int32_t GetSignedOperand(int operand_index, OperandType operand_type) const; 51 52 void UpdateOperandScale(); 53 54 Handle<BytecodeArray> bytecode_array_; 55 int bytecode_offset_; 56 OperandScale operand_scale_; 57 int prefix_offset_; 58 59 DISALLOW_COPY_AND_ASSIGN(BytecodeArrayIterator); 60 }; 61 62 } // namespace interpreter 63 } // namespace internal 64 } // namespace v8 65 66 #endif // V8_INTERPRETER_BYTECODE_GRAPH_ITERATOR_H_ 67
