1 // Copyright 2016 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_ACCESSOR_H_ 6 #define V8_INTERPRETER_BYTECODE_ARRAY_ACCESSOR_H_ 7 8 #include "src/globals.h" 9 #include "src/handles.h" 10 #include "src/interpreter/bytecode-register.h" 11 #include "src/interpreter/bytecodes.h" 12 #include "src/objects.h" 13 #include "src/runtime/runtime.h" 14 15 namespace v8 { 16 namespace internal { 17 namespace interpreter { 18 19 class V8_EXPORT_PRIVATE BytecodeArrayAccessor { 20 public: 21 BytecodeArrayAccessor(Handle<BytecodeArray> bytecode_array, 22 int initial_offset); 23 24 void SetOffset(int offset); 25 26 Bytecode current_bytecode() const; 27 int current_bytecode_size() const; 28 int current_offset() const { return bytecode_offset_; } 29 OperandScale current_operand_scale() const { return operand_scale_; } 30 int current_prefix_offset() const { return prefix_offset_; } 31 const Handle<BytecodeArray>& bytecode_array() const { 32 return bytecode_array_; 33 } 34 35 uint32_t GetFlagOperand(int operand_index) const; 36 uint32_t GetUnsignedImmediateOperand(int operand_index) const; 37 int32_t GetImmediateOperand(int operand_index) const; 38 uint32_t GetIndexOperand(int operand_index) const; 39 uint32_t GetRegisterCountOperand(int operand_index) const; 40 Register GetRegisterOperand(int operand_index) const; 41 int GetRegisterOperandRange(int operand_index) const; 42 Runtime::FunctionId GetRuntimeIdOperand(int operand_index) const; 43 Runtime::FunctionId GetIntrinsicIdOperand(int operand_index) const; 44 Handle<Object> GetConstantForIndexOperand(int operand_index) const; 45 46 // Returns the absolute offset of the branch target at the current 47 // bytecode. It is an error to call this method if the bytecode is 48 // not for a jump or conditional jump. 49 int GetJumpTargetOffset() const; 50 51 bool OffsetWithinBytecode(int offset) const; 52 53 std::ostream& PrintTo(std::ostream& os) const; 54 55 private: 56 bool OffsetInBounds() const; 57 58 uint32_t GetUnsignedOperand(int operand_index, 59 OperandType operand_type) const; 60 int32_t GetSignedOperand(int operand_index, OperandType operand_type) const; 61 62 void UpdateOperandScale(); 63 64 Handle<BytecodeArray> bytecode_array_; 65 int bytecode_offset_; 66 OperandScale operand_scale_; 67 int prefix_offset_; 68 69 DISALLOW_COPY_AND_ASSIGN(BytecodeArrayAccessor); 70 }; 71 72 } // namespace interpreter 73 } // namespace internal 74 } // namespace v8 75 76 #endif // V8_INTERPRETER_BYTECODE_GRAPH_ACCESSOR_H_ 77
