Line data    Source code

       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     1210499 :   int current_offset() const { return bytecode_offset_; }
      29           0 :   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_