core/vm: use pointers to operations vs. copy by value

core/vm/eips.go

@@ -68,12 +68,11 @@ func enable1884(jt *JumpTable) {
 	jt[EXTCODEHASH].constantGas = params.ExtcodeHashGasEIP1884
 
 	// New opcode
-	jt[SELFBALANCE] = operation{
+	jt[SELFBALANCE] = &operation{
 		execute:     opSelfBalance,
 		constantGas: GasFastStep,
 		minStack:    minStack(0, 1),
 		maxStack:    maxStack(0, 1),
-		valid:       true,
 	}
 }
 
@@ -87,12 +86,11 @@ func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx
 // - Adds an opcode that returns the current chain’s EIP-155 unique identifier
 func enable1344(jt *JumpTable) {
 	// New opcode
-	jt[CHAINID] = operation{
+	jt[CHAINID] = &operation{
 		execute:     opChainID,
 		constantGas: GasQuickStep,
 		minStack:    minStack(0, 1),
 		maxStack:    maxStack(0, 1),
-		valid:       true,
 	}
 }
 
@@ -113,29 +111,26 @@ func enable2200(jt *JumpTable) {
 // - Adds opcodes that jump to and return from subroutines
 func enable2315(jt *JumpTable) {
 	// New opcode
-	jt[BEGINSUB] = operation{
+	jt[BEGINSUB] = &operation{
 		execute:     opBeginSub,
 		constantGas: GasQuickStep,
 		minStack:    minStack(0, 0),
 		maxStack:    maxStack(0, 0),
-		valid:       true,
 	}
 	// New opcode
-	jt[JUMPSUB] = operation{
+	jt[JUMPSUB] = &operation{
 		execute:     opJumpSub,
 		constantGas: GasSlowStep,
 		minStack:    minStack(1, 0),
 		maxStack:    maxStack(1, 0),
 		jumps:       true,
-		valid:       true,
 	}
 	// New opcode
-	jt[RETURNSUB] = operation{
+	jt[RETURNSUB] = &operation{
 		execute:     opReturnSub,
 		constantGas: GasFastStep,
 		minStack:    minStack(0, 0),
 		maxStack:    maxStack(0, 0),
-		valid:       true,
 		jumps:       true,
 	}
 }

core/vm/interpreter.go

@@ -32,7 +32,7 @@ type Config struct {
 	NoRecursion             bool   // Disables call, callcode, delegate call and create
 	EnablePreimageRecording bool   // Enables recording of SHA3/keccak preimages
 
-	JumpTable [256]operation // EVM instruction table, automatically populated if unset
+	JumpTable [256]*operation // EVM instruction table, automatically populated if unset
 
 	EWASMInterpreter string // External EWASM interpreter options
 	EVMInterpreter   string // External EVM interpreter options
@@ -96,7 +96,7 @@ func NewEVMInterpreter(evm *EVM, cfg Config) *EVMInterpreter {
 	// We use the STOP instruction whether to see
 	// the jump table was initialised. If it was not
 	// we'll set the default jump table.
-	if !cfg.JumpTable[STOP].valid {
+	if cfg.JumpTable[STOP] == nil {
 		var jt JumpTable
 		switch {
 		case evm.chainRules.IsYoloV1:
@@ -221,7 +221,7 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 		// enough stack items available to perform the operation.
 		op = contract.GetOp(pc)
 		operation := in.cfg.JumpTable[op]
-		if !operation.valid {
+		if operation == nil {
 			return nil, &ErrInvalidOpCode{opcode: op}
 		}
 		// Validate stack