core/vm: update 7702 gas calculation on impacted OpCode

CALL, CALLCODE, STATICCALL, DELEGATECALL. EXTCODE... opcodes are aligned with the EIP update ethereum/EIPs#9248

Author: trantienduchn

core/vm/eips.go

@@ -37,6 +37,7 @@ var activators = map[int]func(*JumpTable){
 	1884: enable1884,
 	1344: enable1344,
 	1153: enable1153,
+	7702: enable7702,
 }
 
 // EnableEIP enables the given EIP on the config.
@@ -319,3 +320,11 @@ func enable6780(jt *JumpTable) {
 		halts:       true,
 	}
 }
+
+// enable7702 the EIP-7702 changes to support delegation designators.
+func enable7702(jt *JumpTable) {
+	jt[CALL].dynamicGas = gasCallEIP7702
+	jt[CALLCODE].dynamicGas = gasCallCodeEIP7702
+	jt[STATICCALL].dynamicGas = gasStaticCallEIP7702
+	jt[DELEGATECALL].dynamicGas = gasDelegateCallEIP7702
+}

core/vm/operations_acl.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/params"
 )
 
@@ -247,3 +248,70 @@ func makeSelfdestructGasFn(refundsEnabled bool) gasFunc {
 	}
 	return gasFunc
 }
+
+var (
+	gasCallEIP7702         = makeCallVariantGasCallEIP7702(gasCall)
+	gasDelegateCallEIP7702 = makeCallVariantGasCallEIP7702(gasDelegateCall)
+	gasStaticCallEIP7702   = makeCallVariantGasCallEIP7702(gasStaticCall)
+	gasCallCodeEIP7702     = makeCallVariantGasCallEIP7702(gasCallCode)
+)
+
+func makeCallVariantGasCallEIP7702(oldCalculator gasFunc) gasFunc {
+	return func(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
+		var (
+			total uint64 // total dynamic gas used
+			addr  = common.Address(stack.Back(1).Bytes20())
+		)
+
+		// Check slot presence in the access list
+		if !evm.StateDB.AddressInAccessList(addr) {
+			evm.StateDB.AddAddressToAccessList(addr)
+			// The WarmStorageReadCostEIP2929 (100) is already deducted in the form of a constant cost, so
+			// the cost to charge for cold access, if any, is Cold - Warm
+			coldCost := params.ColdAccountAccessCostEIP2929 - params.WarmStorageReadCostEIP2929
+			// Charge the remaining difference here already, to correctly calculate available
+			// gas for call
+			if !contract.UseGas(coldCost) {
+				return 0, ErrOutOfGas
+			}
+			total += coldCost
+		}
+
+		// Check if code is a delegation and if so, charge for resolution.
+		if target, ok := types.ParseDelegation(evm.StateDB.GetCode(addr)); ok {
+			var cost uint64
+			if evm.StateDB.AddressInAccessList(target) {
+				cost = params.WarmStorageReadCostEIP2929
+			} else {
+				evm.StateDB.AddAddressToAccessList(target)
+				cost = params.ColdAccountAccessCostEIP2929
+			}
+			if !contract.UseGas(cost) {
+				return 0, ErrOutOfGas
+			}
+			total += cost
+		}
+
+		// Now call the old calculator, which takes into account
+		// - create new account
+		// - transfer value
+		// - memory expansion
+		// - 63/64ths rule
+		old, err := oldCalculator(evm, contract, stack, mem, memorySize)
+		if err != nil {
+			return old, err
+		}
+
+		// Temporarily add the gas charge back to the contract and return value. By
+		// adding it to the return, it will be charged outside of this function, as
+		// part of the dynamic gas. This will ensure it is correctly reported to
+		// tracers.
+		contract.Gas += total
+
+		var overflow bool
+		if total, overflow = math.SafeAdd(old, total); overflow {
+			return 0, ErrGasUintOverflow
+		}
+		return total, nil
+	}
+}