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Unified Diff: src/interpreter/bytecodes.h

Issue 1852213002: [interpreter] Add accumulator use description to bytecodes. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 8 months ago
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Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 8f10766183c2cdb2a6010598b2606ba32a21e64a..a76532b37894a57ce2cb433dd23c5d49345fdb7e 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -48,192 +48,221 @@ namespace interpreter {
REGISTER_OPERAND_TYPE_LIST(V)
// Define one debug break bytecode for each possible size of unscaled
-// bytecodes.
-#define DEBUG_BREAK_PLAIN_BYTECODE_LIST(V) \
- V(DebugBreak0, OperandType::kNone) \
- V(DebugBreak1, OperandType::kReg) \
- V(DebugBreak2, OperandType::kReg, OperandType::kReg) \
- V(DebugBreak3, OperandType::kReg, OperandType::kReg, OperandType::kReg) \
- V(DebugBreak4, OperandType::kReg, OperandType::kReg, OperandType::kReg, \
- OperandType::kReg) \
- V(DebugBreak5, OperandType::kRuntimeId, OperandType::kReg, \
- OperandType::kReg) \
- V(DebugBreak6, OperandType::kRuntimeId, OperandType::kReg, \
- OperandType::kReg, OperandType::kReg)
+// bytecodes. Format is V(<bytecode>, <accumulator_use>, <operands>).
+#define DEBUG_BREAK_PLAIN_BYTECODE_LIST(V) \
+ V(DebugBreak0, AccumulatorUse::kRead) \
+ V(DebugBreak1, AccumulatorUse::kRead, OperandType::kReg) \
+ V(DebugBreak2, AccumulatorUse::kRead, OperandType::kReg, OperandType::kReg) \
+ V(DebugBreak3, AccumulatorUse::kRead, OperandType::kReg, OperandType::kReg, \
+ OperandType::kReg) \
+ V(DebugBreak4, AccumulatorUse::kRead, OperandType::kReg, OperandType::kReg, \
+ OperandType::kReg, OperandType::kReg) \
+ V(DebugBreak5, AccumulatorUse::kRead, OperandType::kRuntimeId, \
+ OperandType::kReg, OperandType::kReg) \
+ V(DebugBreak6, AccumulatorUse::kRead, OperandType::kRuntimeId, \
+ OperandType::kReg, OperandType::kReg, OperandType::kReg)
// Define one debug break for each widening prefix.
#define DEBUG_BREAK_PREFIX_BYTECODE_LIST(V) \
- V(DebugBreakWide, OperandType::kNone) \
- V(DebugBreakExtraWide, OperandType::kNone)
+ V(DebugBreakWide, AccumulatorUse::kRead) \
+ V(DebugBreakExtraWide, AccumulatorUse::kRead)
#define DEBUG_BREAK_BYTECODE_LIST(V) \
DEBUG_BREAK_PLAIN_BYTECODE_LIST(V) \
DEBUG_BREAK_PREFIX_BYTECODE_LIST(V)
// The list of bytecodes which are interpreted by the interpreter.
-#define BYTECODE_LIST(V) \
- /* Extended width operands */ \
- V(Wide, OperandType::kNone) \
- V(ExtraWide, OperandType::kNone) \
- \
- /* Loading the accumulator */ \
- V(LdaZero, OperandType::kNone) \
- V(LdaSmi, OperandType::kImm) \
- V(LdaUndefined, OperandType::kNone) \
- V(LdaNull, OperandType::kNone) \
- V(LdaTheHole, OperandType::kNone) \
- V(LdaTrue, OperandType::kNone) \
- V(LdaFalse, OperandType::kNone) \
- V(LdaConstant, OperandType::kIdx) \
- \
- /* Globals */ \
- V(LdaGlobal, OperandType::kIdx, OperandType::kIdx) \
- V(LdaGlobalInsideTypeof, OperandType::kIdx, OperandType::kIdx) \
- V(StaGlobalSloppy, OperandType::kIdx, OperandType::kIdx) \
- V(StaGlobalStrict, OperandType::kIdx, OperandType::kIdx) \
- \
- /* Context operations */ \
- V(PushContext, OperandType::kReg) \
- V(PopContext, OperandType::kReg) \
- V(LdaContextSlot, OperandType::kReg, OperandType::kIdx) \
- V(StaContextSlot, OperandType::kReg, OperandType::kIdx) \
- \
- /* Load-Store lookup slots */ \
- V(LdaLookupSlot, OperandType::kIdx) \
- V(LdaLookupSlotInsideTypeof, OperandType::kIdx) \
- V(StaLookupSlotSloppy, OperandType::kIdx) \
- V(StaLookupSlotStrict, OperandType::kIdx) \
- \
- /* Register-accumulator transfers */ \
- V(Ldar, OperandType::kReg) \
- V(Star, OperandType::kRegOut) \
- \
- /* Register-register transfers */ \
- V(Mov, OperandType::kReg, OperandType::kRegOut) \
- \
- /* LoadIC operations */ \
- V(LoadIC, OperandType::kReg, OperandType::kIdx, OperandType::kIdx) \
- V(KeyedLoadIC, OperandType::kReg, OperandType::kIdx) \
- \
- /* StoreIC operations */ \
- V(StoreICSloppy, OperandType::kReg, OperandType::kIdx, OperandType::kIdx) \
- V(StoreICStrict, OperandType::kReg, OperandType::kIdx, OperandType::kIdx) \
- V(KeyedStoreICSloppy, OperandType::kReg, OperandType::kReg, \
- OperandType::kIdx) \
- V(KeyedStoreICStrict, OperandType::kReg, OperandType::kReg, \
- OperandType::kIdx) \
- \
- /* Binary Operators */ \
- V(Add, OperandType::kReg) \
- V(Sub, OperandType::kReg) \
- V(Mul, OperandType::kReg) \
- V(Div, OperandType::kReg) \
- V(Mod, OperandType::kReg) \
- V(BitwiseOr, OperandType::kReg) \
- V(BitwiseXor, OperandType::kReg) \
- V(BitwiseAnd, OperandType::kReg) \
- V(ShiftLeft, OperandType::kReg) \
- V(ShiftRight, OperandType::kReg) \
- V(ShiftRightLogical, OperandType::kReg) \
- \
- /* Unary Operators */ \
- V(Inc, OperandType::kNone) \
- V(Dec, OperandType::kNone) \
- V(LogicalNot, OperandType::kNone) \
- V(TypeOf, OperandType::kNone) \
- V(DeletePropertyStrict, OperandType::kReg) \
- V(DeletePropertySloppy, OperandType::kReg) \
- \
- /* Call operations */ \
- V(Call, OperandType::kReg, OperandType::kReg, OperandType::kRegCount, \
- OperandType::kIdx) \
- V(TailCall, OperandType::kReg, OperandType::kReg, OperandType::kRegCount, \
- OperandType::kIdx) \
- V(CallRuntime, OperandType::kRuntimeId, OperandType::kMaybeReg, \
- OperandType::kRegCount) \
- V(CallRuntimeForPair, OperandType::kRuntimeId, OperandType::kMaybeReg, \
- OperandType::kRegCount, OperandType::kRegOutPair) \
- V(CallJSRuntime, OperandType::kIdx, OperandType::kReg, \
- OperandType::kRegCount) \
- \
- /* Intrinsics */ \
- V(InvokeIntrinsic, OperandType::kRuntimeId, OperandType::kMaybeReg, \
- OperandType::kRegCount) \
- \
- /* New operator */ \
- V(New, OperandType::kReg, OperandType::kMaybeReg, OperandType::kRegCount) \
- \
- /* Test Operators */ \
- V(TestEqual, OperandType::kReg) \
- V(TestNotEqual, OperandType::kReg) \
- V(TestEqualStrict, OperandType::kReg) \
- V(TestLessThan, OperandType::kReg) \
- V(TestGreaterThan, OperandType::kReg) \
- V(TestLessThanOrEqual, OperandType::kReg) \
- V(TestGreaterThanOrEqual, OperandType::kReg) \
- V(TestInstanceOf, OperandType::kReg) \
- V(TestIn, OperandType::kReg) \
- \
- /* Cast operators */ \
- V(ToName, OperandType::kNone) \
- V(ToNumber, OperandType::kNone) \
- V(ToObject, OperandType::kNone) \
- \
- /* Literals */ \
- V(CreateRegExpLiteral, OperandType::kIdx, OperandType::kIdx, \
- OperandType::kFlag8) \
- V(CreateArrayLiteral, OperandType::kIdx, OperandType::kIdx, \
- OperandType::kFlag8) \
- V(CreateObjectLiteral, OperandType::kIdx, OperandType::kIdx, \
- OperandType::kFlag8) \
- \
- /* Closure allocation */ \
- V(CreateClosure, OperandType::kIdx, OperandType::kFlag8) \
- \
- /* Arguments allocation */ \
- V(CreateMappedArguments, OperandType::kNone) \
- V(CreateUnmappedArguments, OperandType::kNone) \
- V(CreateRestParameter, OperandType::kNone) \
- \
- /* Control Flow */ \
- V(Jump, OperandType::kImm) \
- V(JumpConstant, OperandType::kIdx) \
- V(JumpIfTrue, OperandType::kImm) \
- V(JumpIfTrueConstant, OperandType::kIdx) \
- V(JumpIfFalse, OperandType::kImm) \
- V(JumpIfFalseConstant, OperandType::kIdx) \
- V(JumpIfToBooleanTrue, OperandType::kImm) \
- V(JumpIfToBooleanTrueConstant, OperandType::kIdx) \
- V(JumpIfToBooleanFalse, OperandType::kImm) \
- V(JumpIfToBooleanFalseConstant, OperandType::kIdx) \
- V(JumpIfNull, OperandType::kImm) \
- V(JumpIfNullConstant, OperandType::kIdx) \
- V(JumpIfUndefined, OperandType::kImm) \
- V(JumpIfUndefinedConstant, OperandType::kIdx) \
- V(JumpIfNotHole, OperandType::kImm) \
- V(JumpIfNotHoleConstant, OperandType::kIdx) \
- \
- /* Complex flow control For..in */ \
- V(ForInPrepare, OperandType::kRegOutTriple) \
- V(ForInDone, OperandType::kReg, OperandType::kReg) \
- V(ForInNext, OperandType::kReg, OperandType::kReg, OperandType::kRegPair, \
- OperandType::kIdx) \
- V(ForInStep, OperandType::kReg) \
- \
- /* Perform a stack guard check */ \
- V(StackCheck, OperandType::kNone) \
- \
- /* Non-local flow control */ \
- V(Throw, OperandType::kNone) \
- V(ReThrow, OperandType::kNone) \
- V(Return, OperandType::kNone) \
- \
- /* Debugger */ \
- V(Debugger, OperandType::kNone) \
- DEBUG_BREAK_BYTECODE_LIST(V) \
- \
- /* Illegal bytecode (terminates execution) */ \
- V(Illegal, OperandType::kNone)
+#define BYTECODE_LIST(V) \
+ /* Extended width operands */ \
+ V(Wide, AccumulatorUse::kNone) \
+ V(ExtraWide, AccumulatorUse::kNone) \
+ \
+ /* Loading the accumulator */ \
+ V(LdaZero, AccumulatorUse::kWrite) \
+ V(LdaSmi, AccumulatorUse::kWrite, OperandType::kImm) \
+ V(LdaUndefined, AccumulatorUse::kWrite) \
+ V(LdaNull, AccumulatorUse::kWrite) \
+ V(LdaTheHole, AccumulatorUse::kWrite) \
+ V(LdaTrue, AccumulatorUse::kWrite) \
+ V(LdaFalse, AccumulatorUse::kWrite) \
+ V(LdaConstant, AccumulatorUse::kWrite, OperandType::kIdx) \
+ \
+ /* Globals */ \
+ V(LdaGlobal, AccumulatorUse::kWrite, OperandType::kIdx, OperandType::kIdx) \
+ V(LdaGlobalInsideTypeof, AccumulatorUse::kWrite, OperandType::kIdx, \
+ OperandType::kIdx) \
+ V(StaGlobalSloppy, AccumulatorUse::kRead, OperandType::kIdx, \
+ OperandType::kIdx) \
+ V(StaGlobalStrict, AccumulatorUse::kRead, OperandType::kIdx, \
+ OperandType::kIdx) \
+ \
+ /* Context operations */ \
+ V(PushContext, AccumulatorUse::kRead, OperandType::kReg) \
+ V(PopContext, AccumulatorUse::kNone, OperandType::kReg) \
+ V(LdaContextSlot, AccumulatorUse::kWrite, OperandType::kReg, \
+ OperandType::kIdx) \
+ V(StaContextSlot, AccumulatorUse::kRead, OperandType::kReg, \
+ OperandType::kIdx) \
+ \
+ /* Load-Store lookup slots */ \
+ V(LdaLookupSlot, AccumulatorUse::kWrite, OperandType::kIdx) \
+ V(LdaLookupSlotInsideTypeof, AccumulatorUse::kWrite, OperandType::kIdx) \
+ V(StaLookupSlotSloppy, AccumulatorUse::kReadWrite, OperandType::kIdx) \
+ V(StaLookupSlotStrict, AccumulatorUse::kReadWrite, OperandType::kIdx) \
+ \
+ /* Register-accumulator transfers */ \
+ V(Ldar, AccumulatorUse::kWrite, OperandType::kReg) \
+ V(Star, AccumulatorUse::kRead, OperandType::kRegOut) \
+ \
+ /* Register-register transfers */ \
+ V(Mov, AccumulatorUse::kNone, OperandType::kReg, OperandType::kRegOut) \
+ \
+ /* LoadIC operations */ \
+ V(LoadIC, AccumulatorUse::kWrite, OperandType::kReg, OperandType::kIdx, \
+ OperandType::kIdx) \
+ V(KeyedLoadIC, AccumulatorUse::kReadWrite, OperandType::kReg, \
+ OperandType::kIdx) \
+ \
+ /* StoreIC operations */ \
+ V(StoreICSloppy, AccumulatorUse::kRead, OperandType::kReg, \
+ OperandType::kIdx, OperandType::kIdx) \
+ V(StoreICStrict, AccumulatorUse::kRead, OperandType::kReg, \
+ OperandType::kIdx, OperandType::kIdx) \
+ V(KeyedStoreICSloppy, AccumulatorUse::kRead, OperandType::kReg, \
+ OperandType::kReg, OperandType::kIdx) \
+ V(KeyedStoreICStrict, AccumulatorUse::kRead, OperandType::kReg, \
+ OperandType::kReg, OperandType::kIdx) \
+ \
+ /* Binary Operators */ \
+ V(Add, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(Sub, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(Mul, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(Div, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(Mod, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(BitwiseOr, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(BitwiseXor, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(BitwiseAnd, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(ShiftLeft, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(ShiftRight, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(ShiftRightLogical, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ \
+ /* Unary Operators */ \
+ V(Inc, AccumulatorUse::kReadWrite) \
+ V(Dec, AccumulatorUse::kReadWrite) \
+ V(LogicalNot, AccumulatorUse::kReadWrite) \
+ V(TypeOf, AccumulatorUse::kReadWrite) \
+ V(DeletePropertyStrict, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(DeletePropertySloppy, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ \
+ /* Call operations */ \
+ V(Call, AccumulatorUse::kWrite, OperandType::kReg, OperandType::kReg, \
+ OperandType::kRegCount, OperandType::kIdx) \
+ V(TailCall, AccumulatorUse::kWrite, OperandType::kReg, OperandType::kReg, \
+ OperandType::kRegCount, OperandType::kIdx) \
+ V(CallRuntime, AccumulatorUse::kWrite, OperandType::kRuntimeId, \
+ OperandType::kMaybeReg, OperandType::kRegCount) \
+ V(CallRuntimeForPair, AccumulatorUse::kNone, OperandType::kRuntimeId, \
+ OperandType::kMaybeReg, OperandType::kRegCount, OperandType::kRegOutPair) \
+ V(CallJSRuntime, AccumulatorUse::kWrite, OperandType::kIdx, \
+ OperandType::kReg, OperandType::kRegCount) \
+ \
+ /* Intrinsics */ \
+ V(InvokeIntrinsic, AccumulatorUse::kWrite, OperandType::kRuntimeId, \
+ OperandType::kMaybeReg, OperandType::kRegCount) \
+ \
+ /* New operator */ \
+ V(New, AccumulatorUse::kReadWrite, OperandType::kReg, \
+ OperandType::kMaybeReg, OperandType::kRegCount) \
+ \
+ /* Test Operators */ \
+ V(TestEqual, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestNotEqual, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestEqualStrict, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestLessThan, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestGreaterThan, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestLessThanOrEqual, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestGreaterThanOrEqual, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestInstanceOf, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ V(TestIn, AccumulatorUse::kReadWrite, OperandType::kReg) \
+ \
+ /* Cast operators */ \
+ V(ToName, AccumulatorUse::kReadWrite) \
+ V(ToNumber, AccumulatorUse::kReadWrite) \
+ V(ToObject, AccumulatorUse::kReadWrite) \
+ \
+ /* Literals */ \
+ V(CreateRegExpLiteral, AccumulatorUse::kWrite, OperandType::kIdx, \
+ OperandType::kIdx, OperandType::kFlag8) \
+ V(CreateArrayLiteral, AccumulatorUse::kWrite, OperandType::kIdx, \
+ OperandType::kIdx, OperandType::kFlag8) \
+ V(CreateObjectLiteral, AccumulatorUse::kWrite, OperandType::kIdx, \
+ OperandType::kIdx, OperandType::kFlag8) \
+ \
+ /* Closure allocation */ \
+ V(CreateClosure, AccumulatorUse::kWrite, OperandType::kIdx, \
+ OperandType::kFlag8) \
+ \
+ /* Arguments allocation */ \
+ V(CreateMappedArguments, AccumulatorUse::kWrite) \
+ V(CreateUnmappedArguments, AccumulatorUse::kWrite) \
+ V(CreateRestParameter, AccumulatorUse::kWrite) \
+ \
+ /* Control Flow */ \
+ V(Jump, AccumulatorUse::kNone, OperandType::kImm) \
+ V(JumpConstant, AccumulatorUse::kNone, OperandType::kIdx) \
+ V(JumpIfTrue, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfTrueConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ V(JumpIfFalse, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfFalseConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ V(JumpIfToBooleanTrue, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfToBooleanTrueConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ V(JumpIfToBooleanFalse, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfToBooleanFalseConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ V(JumpIfNull, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfNullConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ V(JumpIfUndefined, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfUndefinedConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ V(JumpIfNotHole, AccumulatorUse::kRead, OperandType::kImm) \
+ V(JumpIfNotHoleConstant, AccumulatorUse::kRead, OperandType::kIdx) \
+ \
+ /* Complex flow control For..in */ \
+ V(ForInPrepare, AccumulatorUse::kRead, OperandType::kRegOutTriple) \
+ V(ForInDone, AccumulatorUse::kWrite, OperandType::kReg, OperandType::kReg) \
+ V(ForInNext, AccumulatorUse::kWrite, OperandType::kReg, OperandType::kReg, \
+ OperandType::kRegPair, OperandType::kIdx) \
+ V(ForInStep, AccumulatorUse::kWrite, OperandType::kReg) \
+ \
+ /* Perform a stack guard check */ \
+ V(StackCheck, AccumulatorUse::kNone) \
+ \
+ /* Non-local flow control */ \
+ V(Throw, AccumulatorUse::kRead) \
+ V(ReThrow, AccumulatorUse::kRead) \
+ V(Return, AccumulatorUse::kNone) \
+ \
+ /* Debugger */ \
+ V(Debugger, AccumulatorUse::kNone) \
+ DEBUG_BREAK_BYTECODE_LIST(V) \
+ \
+ /* Illegal bytecode (terminates execution) */ \
+ V(Illegal, AccumulatorUse::kNone)
+
+enum class AccumulatorUse : uint8_t {
+ kNone = 0,
+ kRead = 1,
+ kWrite = 2,
rmcilroy 2016/04/05 12:59:22 Nit - could you make this 1 << 1 (and read 1 << 0)
oth 2016/04/05 14:12:10 Done.
+ kReadWrite = kRead | kWrite
+};
+
+V8_INLINE AccumulatorUse operator&(AccumulatorUse lhs, AccumulatorUse rhs) {
+ int result = static_cast<int>(lhs) & static_cast<int>(rhs);
+ return static_cast<AccumulatorUse>(result);
+}
+
+V8_INLINE AccumulatorUse operator|(AccumulatorUse lhs, AccumulatorUse rhs) {
+ int result = static_cast<int>(lhs) | static_cast<int>(rhs);
+ return static_cast<AccumulatorUse>(result);
+}
// Enumeration of scaling factors applicable to scalable operands. Code
// relies on being able to cast values to integer scaling values.
@@ -374,6 +403,9 @@ class Bytecodes {
// Returns string representation of |bytecode|.
static std::string ToString(Bytecode bytecode, OperandScale operand_scale);
+ // Returns string representation of |accumulator_use|.
+ static const char* AccumulatorUseToString(AccumulatorUse accumulator_use);
+
// Returns string representation of |operand_type|.
static const char* OperandTypeToString(OperandType operand_type);
@@ -406,6 +438,15 @@ class Bytecodes {
// is a scaling prefix.
static OperandScale PrefixBytecodeToOperandScale(Bytecode bytecode);
+ // Returns how accumulator is used by |bytecode|.
+ static AccumulatorUse GetAccumulatorUse(Bytecode bytecode);
+
+ // Returns true if |bytecode| reads the accumulator.
+ static bool ReadsAccumulator(Bytecode bytecode);
+
+ // Returns true if |bytecode| writes the accumulator.
+ static bool WritesAccumulator(Bytecode bytecode);
+
// Returns the i-th operand of |bytecode|.
static OperandType GetOperandType(Bytecode bytecode, int i);
@@ -520,6 +561,7 @@ class Bytecodes {
};
std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
+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);
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