[interpreter] Ensure optimizations preserve source positions.

src/interpreter/bytecodes.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_INTERPRETER_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <iosfwd>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 477 matching lines @@
 
   // Returns true if |bytecode| reads the accumulator.
   static bool ReadsAccumulator(Bytecode bytecode);
 
   // Returns true if |bytecode| writes the accumulator.
   static bool WritesAccumulator(Bytecode bytecode);
 
   // Return true if |bytecode| writes the accumulator with a boolean value.
   static bool WritesBooleanToAccumulator(Bytecode bytecode);
 
-  // Return true if |bytecode| is an accumulator load bytecode,
+  // Return true if |bytecode| is an accumulator load without effects,
   // e.g. LdaConstant, LdaTrue, Ldar.
   static bool IsAccumulatorLoadWithoutEffects(Bytecode bytecode);
 
+  // Return true if |bytecode| is a jump without effects,
+  // e.g.  any jump excluding those that include type coercion like
+  // JumpIfTrueToBoolean.
+  static bool IsJumpWithoutEffects(Bytecode bytecode);
+
+  // Return true if |bytecode| is a register load without effects,
+  // e.g. Mov, Star, LdrUndefined.
+  static bool IsRegisterLoadWithoutEffects(Bytecode bytecode);
+
+  // Returns true if |bytecode| has no effects.
+  static bool IsWithoutExternalSideEffects(Bytecode bytecode);
+
   // Returns the i-th operand of |bytecode|.
   static OperandType GetOperandType(Bytecode bytecode, int i);
 
   // Returns a pointer to an array of operand types terminated in
   // OperandType::kNone.
   static const OperandType* GetOperandTypes(Bytecode bytecode);
 
   // Returns the size of the i-th operand of |bytecode|.
   static OperandSize GetOperandSize(Bytecode bytecode, int i,
                                     OperandScale operand_scale);
@@ skipping 69 matching lines @@
 
   // Returns true if the bytecode is Ldar or Star.
   static bool IsLdarOrStar(Bytecode bytecode);
 
   // Returns true if the bytecode has wider operand forms.
   static bool IsBytecodeWithScalableOperands(Bytecode bytecode);
 
   // Returns true if the bytecode is a scaling prefix bytecode.
   static bool IsPrefixScalingBytecode(Bytecode bytecode);
 
-  // Returns true if the bytecode has no effects outside the current
-  // interpreter frame.
-  static bool IsWithoutExternalSideEffects(Bytecode bytecode);
-
   // Returns true if |operand_type| is any type of register operand.
   static bool IsRegisterOperandType(OperandType operand_type);
 
   // Returns true if |operand_type| represents a register used as an input.
   static bool IsRegisterInputOperandType(OperandType operand_type);
 
   // Returns true if |operand_type| represents a register used as an output.
   static bool IsRegisterOutputOperandType(OperandType operand_type);
 
   // Returns the number of registers represented by a register operand. For
@@ skipping 68 matching lines @@
 std::ostream& operator<<(std::ostream& os, const AccumulatorUse& use);
 std::ostream& operator<<(std::ostream& os, const OperandScale& operand_scale);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_