core: introduce GasChangeHook v2 (#34946)

This PR introduces OnGasChangeV2 tracing hook, as the pre-requisite for landing
EIP-8037.

---------

Co-authored-by: Sina M <1591639+s1na@users.noreply.github.com>

core/state_transition.go

@@ -420,8 +420,10 @@ func (st *stateTransition) buyGas() error {
 		return err
 	}
 
-	if st.evm.Config.Tracer != nil && st.evm.Config.Tracer.OnGasChange != nil {
+	if st.evm.Config.Tracer.HasGasHook() {
-		st.evm.Config.Tracer.OnGasChange(0, st.msg.GasLimit, tracing.GasChangeTxInitialBalance)
+		empty := vm.GasBudget{}
+		initial := vm.NewGasBudget(st.msg.GasLimit)
+		st.evm.Config.Tracer.EmitGasChange(empty.AsTracing(), initial.AsTracing(), tracing.GasChangeTxInitialBalance)
 	}
 	st.gasRemaining = vm.NewGasBudget(st.msg.GasLimit)
 	st.initialBudget = st.gasRemaining.Copy()
@@ -566,8 +568,8 @@ func (st *stateTransition) execute() (*ExecutionResult, error) {
 	if !sufficient {
 		return nil, fmt.Errorf("%w: have %d, want %d", ErrIntrinsicGas, st.gasRemaining.RegularGas, cost.RegularGas)
 	}
-	if t := st.evm.Config.Tracer; t != nil && t.OnGasChange != nil {
+	if st.evm.Config.Tracer.HasGasHook() {
-		t.OnGasChange(prior, st.gasRemaining.RegularGas, tracing.GasChangeTxIntrinsicGas)
+		st.evm.Config.Tracer.EmitGasChange(prior.AsTracing(), st.gasRemaining.AsTracing(), tracing.GasChangeTxIntrinsicGas)
 	}
 	// Gas limit suffices for the floor data cost (EIP-7623)
 	if rules.IsPrague {
@@ -651,8 +653,8 @@ func (st *stateTransition) execute() (*ExecutionResult, error) {
 		// After EIP-7623: Data-heavy transactions pay the floor gas.
 		if used := st.gasUsed(); used < floorDataGas {
 			prior, _ := st.gasRemaining.Charge(vm.GasCosts{RegularGas: floorDataGas - used})
-			if t := st.evm.Config.Tracer; t != nil && t.OnGasChange != nil {
+			if st.evm.Config.Tracer.HasGasHook() {
-				t.OnGasChange(prior, st.gasRemaining.RegularGas, tracing.GasChangeTxDataFloor)
+				st.evm.Config.Tracer.EmitGasChange(prior.AsTracing(), st.gasRemaining.AsTracing(), tracing.GasChangeTxDataFloor)
 			}
 		}
 		if peakGasUsed < floorDataGas {
@@ -780,8 +782,11 @@ func (st *stateTransition) calcRefund() vm.GasBudget {
 	if refund > st.state.GetRefund() {
 		refund = st.state.GetRefund()
 	}
-	if st.evm.Config.Tracer != nil && st.evm.Config.Tracer.OnGasChange != nil && refund > 0 {
+	if refund > 0 && st.evm.Config.Tracer.HasGasHook() {
-		st.evm.Config.Tracer.OnGasChange(st.gasRemaining.RegularGas, st.gasRemaining.RegularGas+refund, tracing.GasChangeTxRefunds)
+		after := st.gasRemaining
+		after.RegularGas += refund
+
+		st.evm.Config.Tracer.EmitGasChange(st.gasRemaining.AsTracing(), after.AsTracing(), tracing.GasChangeTxRefunds)
 	}
 	return vm.NewGasBudget(refund)
 }
@@ -793,8 +798,10 @@ func (st *stateTransition) returnGas() {
 	remaining.Mul(remaining, st.msg.GasPrice)
 	st.state.AddBalance(st.msg.From, remaining, tracing.BalanceIncreaseGasReturn)
 
-	if st.evm.Config.Tracer != nil && st.evm.Config.Tracer.OnGasChange != nil && st.gasRemaining.RegularGas > 0 {
+	if st.gasRemaining.RegularGas > 0 && st.evm.Config.Tracer.HasGasHook() {
-		st.evm.Config.Tracer.OnGasChange(st.gasRemaining.RegularGas, 0, tracing.GasChangeTxLeftOverReturned)
+		after := st.gasRemaining
+		after.RegularGas = 0
+		st.evm.Config.Tracer.EmitGasChange(st.gasRemaining.AsTracing(), after.AsTracing(), tracing.GasChangeTxLeftOverReturned)
 	}
 }
 

core/tracing/hooks.go

@@ -164,10 +164,36 @@ type (
 	// FaultHook is invoked when an error occurs during the execution of an opcode.
 	FaultHook = func(pc uint64, op byte, gas, cost uint64, scope OpContext, depth int, err error)
 
-	// GasChangeHook is invoked when the gas changes.
+	// GasChangeHook reports changes to the regular execution gas. Tracers
+	// that don't need visibility into the state-access gas dimension
+	// introduced by EIP-8037 (Amsterdam) can implement only this hook; it
+	// will continue to fire across the Amsterdam fork unchanged.
+	//
+	// If both this hook and GasChangeHookV2 are implemented on the same
+	// tracer, only V2 will be invoked. Implement exactly one to avoid
+	// double-counting.
 	GasChangeHook = func(old, new uint64, reason GasChangeReason)
 
-	// TODO(sina, rjl), please add GasChangeV2Hook by landing the multi-dimensional gas
+	// GasChangeHookV2 is invoked when any gas dimension changes. It is the
+	// multi-dimensional successor to GasChangeHook, exposing the state-access
+	// gas dimension introduced by EIP-8037 (Amsterdam) alongside the regular
+	// dimension.
+	//
+	// Compatibility:
+	//   - Post-Amsterdam: fires for changes to either the regular or the
+	//     state-access dimension. The non-changing dimension is passed through
+	//     unchanged in both `old` and `new` so consumers always observe the
+	//     complete gas vector.
+	//   - Pre-Amsterdam: no state-access gas events occur, so the State field
+	//     of both `old` and `new` is always zero. Tracers that register only
+	//     V2 still receive every regular-gas change as Gas{State: 0} and
+	//     behave identically to a V1 tracer; there is no pre-Amsterdam event
+	//     a V2-only tracer misses.
+	//
+	// V1 and V2 coexist: when both are registered on a tracer, only V2 is
+	// invoked. Tracers SHOULD register at most one of the two to avoid
+	// double-counting.
+	GasChangeHookV2 = func(old, new Gas, reason GasChangeReason)
 
 	/*
 		- Chain events -
@@ -257,6 +283,7 @@ type Hooks struct {
 	OnOpcode      OpcodeHook
 	OnFault       FaultHook
 	OnGasChange   GasChangeHook
+	OnGasChangeV2 GasChangeHookV2
 	// Chain events
 	OnBlockchainInit    BlockchainInitHook
 	OnClose             CloseHook
@@ -280,6 +307,35 @@ type Hooks struct {
 	OnBlockHashRead BlockHashReadHook
 }
 
+// HasGasHook reports whether any gas-change hook is registered. Call sites
+// should use this to short-circuit before constructing the Gas / GasBudget
+// arguments to EmitGasChange when tracing is off — the dispatch is otherwise
+// always paid the cost of evaluating those args.
+func (h *Hooks) HasGasHook() bool {
+	return h != nil && (h.OnGasChangeV2 != nil || h.OnGasChange != nil)
+}
+
+// EmitGasChange dispatches a gas change event to the registered hooks. If the
+// multi-dimensional OnGasChangeV2 hook is set it is invoked with the full Gas
+// vectors; otherwise the single-dimensional OnGasChange hook is invoked with
+// the regular-gas dimension only. The call is a no-op when the receiver is
+// nil, when neither hook is registered, or when the reason is GasChangeIgnored.
+//
+// Call sites SHOULD use this helper instead of invoking the hooks directly so
+// that both variants stay consistent across the Amsterdam fork boundary.
+func (h *Hooks) EmitGasChange(old, new Gas, reason GasChangeReason) {
+	if h == nil || reason == GasChangeIgnored {
+		return
+	}
+	if h.OnGasChangeV2 != nil {
+		h.OnGasChangeV2(old, new, reason)
+		return
+	}
+	if h.OnGasChange != nil {
+		h.OnGasChange(old.Regular, new.Regular, reason)
+	}
+}
+
 // BalanceChangeReason is used to indicate the reason for a balance change, useful
 // for tracing and reporting.
 type BalanceChangeReason byte
@@ -335,6 +391,19 @@ const (
 	BalanceChangeRevert BalanceChangeReason = 15
 )
 
+// Gas represents a multi-dimensional gas budget introduced by EIP-8037.
+// It carries the regular execution gas and the state-access gas, which are
+// metered independently from the Amsterdam fork onwards.
+//
+// Before Amsterdam, gas metering is single-dimensional and only the Regular
+// field is meaningful; State is always zero. The struct is shaped so that
+// pre-Amsterdam call sites can populate it as Gas{Regular: g} without loss
+// of fidelity relative to the legacy single-uint64 hook.
+type Gas struct {
+	Regular uint64 // Regular is the budget for ordinary execution gas.
+	State   uint64 // State is the budget dedicated to state-access gas (zero pre-Amsterdam).
+}
+
 // GasChangeReason is used to indicate the reason for a gas change, useful
 // for tracing and reporting.
 //

core/vm/contract.go

@@ -131,8 +131,8 @@ func (c *Contract) UseGas(cost GasCosts, logger *tracing.Hooks, reason tracing.G
 	if !ok {
 		return false
 	}
-	if logger != nil && logger.OnGasChange != nil && reason != tracing.GasChangeIgnored {
+	if logger.HasGasHook() && reason != tracing.GasChangeIgnored {
-		logger.OnGasChange(prior, c.Gas.RegularGas, reason)
+		logger.EmitGasChange(prior.AsTracing(), c.Gas.AsTracing(), reason)
 	}
 	return true
 }
@@ -143,8 +143,8 @@ func (c *Contract) RefundGas(refund GasBudget, logger *tracing.Hooks, reason tra
 	if !changed {
 		return
 	}
-	if logger != nil && logger.OnGasChange != nil && reason != tracing.GasChangeIgnored {
+	if logger.HasGasHook() && reason != tracing.GasChangeIgnored {
-		logger.OnGasChange(prior, c.Gas.RegularGas, reason)
+		logger.EmitGasChange(prior.AsTracing(), c.Gas.AsTracing(), reason)
 	}
 }
 

core/vm/contracts.go

@@ -269,8 +269,8 @@ func RunPrecompiledContract(stateDB StateDB, p PrecompiledContract, address comm
 		gas.Exhaust()
 		return nil, gas, ErrOutOfGas
 	}
-	if logger != nil && logger.OnGasChange != nil {
+	if logger.HasGasHook() {
-		logger.OnGasChange(prior, gas.RegularGas, tracing.GasChangeCallPrecompiledContract)
+		logger.EmitGasChange(prior.AsTracing(), gas.AsTracing(), tracing.GasChangeCallPrecompiledContract)
 	}
 	// Touch the precompile for block-level accessList recording once Amsterdam
 	// fork is activated.

core/vm/evm.go

@@ -317,8 +317,8 @@ func (evm *EVM) Call(caller common.Address, addr common.Address, input []byte, g
 	if err != nil {
 		evm.StateDB.RevertToSnapshot(snapshot)
 		if err != ErrExecutionReverted {
-			if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+			if evm.Config.Tracer.HasGasHook() {
-				evm.Config.Tracer.OnGasChange(gas.RegularGas, 0, tracing.GasChangeCallFailedExecution)
+				evm.Config.Tracer.EmitGasChange(gas.AsTracing(), tracing.Gas{}, tracing.GasChangeCallFailedExecution)
 			}
 			gas.Exhaust()
 		}
@@ -371,8 +371,8 @@ func (evm *EVM) CallCode(caller common.Address, addr common.Address, input []byt
 	if err != nil {
 		evm.StateDB.RevertToSnapshot(snapshot)
 		if err != ErrExecutionReverted {
-			if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+			if evm.Config.Tracer.HasGasHook() {
-				evm.Config.Tracer.OnGasChange(gas.RegularGas, 0, tracing.GasChangeCallFailedExecution)
+				evm.Config.Tracer.EmitGasChange(gas.AsTracing(), tracing.Gas{}, tracing.GasChangeCallFailedExecution)
 			}
 			gas.Exhaust()
 		}
@@ -415,8 +415,8 @@ func (evm *EVM) DelegateCall(originCaller common.Address, caller common.Address,
 	if err != nil {
 		evm.StateDB.RevertToSnapshot(snapshot)
 		if err != ErrExecutionReverted {
-			if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+			if evm.Config.Tracer.HasGasHook() {
-				evm.Config.Tracer.OnGasChange(gas.RegularGas, 0, tracing.GasChangeCallFailedExecution)
+				evm.Config.Tracer.EmitGasChange(gas.AsTracing(), tracing.Gas{}, tracing.GasChangeCallFailedExecution)
 			}
 			gas.Exhaust()
 		}
@@ -470,8 +470,8 @@ func (evm *EVM) StaticCall(caller common.Address, addr common.Address, input []b
 	if err != nil {
 		evm.StateDB.RevertToSnapshot(snapshot)
 		if err != ErrExecutionReverted {
-			if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+			if evm.Config.Tracer.HasGasHook() {
-				evm.Config.Tracer.OnGasChange(gas.RegularGas, 0, tracing.GasChangeCallFailedExecution)
+				evm.Config.Tracer.EmitGasChange(gas.AsTracing(), tracing.Gas{}, tracing.GasChangeCallFailedExecution)
 			}
 			gas.Exhaust()
 		}
@@ -509,8 +509,8 @@ func (evm *EVM) create(caller common.Address, code []byte, gas GasBudget, value
 			gas.Exhaust()
 			return nil, common.Address{}, gas, ErrOutOfGas
 		}
-		if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+		if evm.Config.Tracer.HasGasHook() {
-			evm.Config.Tracer.OnGasChange(prior, gas.RegularGas, tracing.GasChangeWitnessContractCollisionCheck)
+			evm.Config.Tracer.EmitGasChange(prior.AsTracing(), gas.AsTracing(), tracing.GasChangeWitnessContractCollisionCheck)
 		}
 	}
 
@@ -528,8 +528,8 @@ func (evm *EVM) create(caller common.Address, code []byte, gas GasBudget, value
 	if evm.StateDB.GetNonce(address) != 0 ||
 		(contractHash != (common.Hash{}) && contractHash != types.EmptyCodeHash) || // non-empty code
 		isEIP7610RejectedAccount(evm.ChainConfig().ChainID, address, evm.chainRules.IsEIP158) {
-		if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+		if evm.Config.Tracer.HasGasHook() {
-			evm.Config.Tracer.OnGasChange(gas.RegularGas, 0, tracing.GasChangeCallFailedExecution)
+			evm.Config.Tracer.EmitGasChange(gas.AsTracing(), tracing.Gas{}, tracing.GasChangeCallFailedExecution)
 		}
 		gas.Exhaust()
 		return nil, common.Address{}, gas, ErrContractAddressCollision
@@ -558,8 +558,8 @@ func (evm *EVM) create(caller common.Address, code []byte, gas GasBudget, value
 			return nil, common.Address{}, gas, ErrOutOfGas
 		}
 		prior, _ := gas.Charge(GasCosts{RegularGas: consumed})
-		if evm.Config.Tracer != nil && evm.Config.Tracer.OnGasChange != nil {
+		if evm.Config.Tracer.HasGasHook() {
-			evm.Config.Tracer.OnGasChange(prior, gas.RegularGas, tracing.GasChangeWitnessContractInit)
+			evm.Config.Tracer.EmitGasChange(prior.AsTracing(), gas.AsTracing(), tracing.GasChangeWitnessContractInit)
 		}
 	}
 	evm.Context.Transfer(evm.StateDB, caller, address, value, &evm.chainRules)
@@ -673,15 +673,17 @@ func (evm *EVM) captureBegin(depth int, typ OpCode, from common.Address, to comm
 	if tracer.OnEnter != nil {
 		tracer.OnEnter(depth, byte(typ), from, to, input, startGas, value)
 	}
-	if tracer.OnGasChange != nil {
+	if tracer.HasGasHook() {
-		tracer.OnGasChange(0, startGas, tracing.GasChangeCallInitialBalance)
+		initial := NewGasBudget(startGas)
+		tracer.EmitGasChange(tracing.Gas{}, initial.AsTracing(), tracing.GasChangeCallInitialBalance)
 	}
 }
 
 func (evm *EVM) captureEnd(depth int, startGas uint64, leftOverGas uint64, ret []byte, err error) {
 	tracer := evm.Config.Tracer
-	if leftOverGas != 0 && tracer.OnGasChange != nil {
+	if leftOverGas != 0 && tracer.HasGasHook() {
-		tracer.OnGasChange(leftOverGas, 0, tracing.GasChangeCallLeftOverReturned)
+		leftover := NewGasBudget(leftOverGas)
+		tracer.EmitGasChange(leftover.AsTracing(), tracing.Gas{}, tracing.GasChangeCallLeftOverReturned)
 	}
 	var reverted bool
 	if err != nil {

core/vm/gascosts.go

@@ -16,7 +16,11 @@
 
 package vm
 
-import "fmt"
+import (
+	"fmt"
+
+	"github.com/ethereum/go-ethereum/core/tracing"
+)
 
 // GasCosts denotes a vector of gas costs in the
 // multidimensional metering paradigm. It represents the cost
@@ -77,21 +81,26 @@ func (g GasBudget) CanAfford(cost GasCosts) bool {
 }
 
 // Charge deducts the given gas cost from the budget. It returns the
-// pre-charge gas value and false if the budget does not have sufficient
+// pre-charge budget and false if the budget does not have sufficient
 // gas to cover the cost.
-func (g *GasBudget) Charge(cost GasCosts) (uint64, bool) {
+func (g *GasBudget) Charge(cost GasCosts) (GasBudget, bool) {
-	prior := g.RegularGas
+	prior := *g
-	if prior < cost.RegularGas {
+	if g.RegularGas < cost.RegularGas {
 		return prior, false
 	}
 	g.RegularGas -= cost.RegularGas
 	return prior, true
 }
 
-// Refund adds the given gas budget back. It returns the pre-refund gas
+// Refund adds the given gas budget back. It returns the pre-refund budget
-// value and whether the budget was actually changed.
+// and whether the budget was actually changed.
-func (g *GasBudget) Refund(other GasBudget) (uint64, bool) {
+func (g *GasBudget) Refund(other GasBudget) (GasBudget, bool) {
-	prior := g.RegularGas
+	prior := *g
 	g.RegularGas += other.RegularGas
-	return prior, g.RegularGas != prior
+	return prior, g.RegularGas != prior.RegularGas
+}
+
+// AsTracing converts the GasBudget into the tracing-facing Gas vector.
+func (g GasBudget) AsTracing() tracing.Gas {
+	return tracing.Gas{Regular: g.RegularGas, State: g.StateGas}
 }

core/vm/interpreter.go

@@ -234,8 +234,12 @@ func (evm *EVM) Run(contract *Contract, input []byte, readOnly bool) (ret []byte
 
 		// Do tracing before potential memory expansion
 		if debug {
-			if evm.Config.Tracer.OnGasChange != nil {
+			if evm.Config.Tracer.HasGasHook() {
-				evm.Config.Tracer.OnGasChange(gasCopy, gasCopy-cost, tracing.GasChangeCallOpCode)
+				evm.Config.Tracer.EmitGasChange(
+					tracing.Gas{Regular: gasCopy, State: contract.Gas.StateGas},
+					tracing.Gas{Regular: gasCopy - cost, State: contract.Gas.StateGas},
+					tracing.GasChangeCallOpCode,
+				)
 			}
 			if evm.Config.Tracer.OnOpcode != nil {
 				evm.Config.Tracer.OnOpcode(pc, byte(op), gasCopy, cost, callContext, evm.returnData, evm.depth, VMErrorFromErr(err))

eth/tracers/live/noop.go

@@ -47,6 +47,7 @@ func newNoopTracer(_ json.RawMessage) (*tracing.Hooks, error) {
 		OnOpcode:         t.OnOpcode,
 		OnFault:          t.OnFault,
 		OnGasChange:      t.OnGasChange,
+		OnGasChangeV2:    t.OnGasChangeV2,
 		OnBlockchainInit: t.OnBlockchainInit,
 		OnBlockStart:     t.OnBlockStart,
 		OnBlockEnd:       t.OnBlockEnd,
@@ -113,3 +114,6 @@ func (t *noop) OnBlockHashRead(number uint64, hash common.Hash) {}
 
 func (t *noop) OnGasChange(old, new uint64, reason tracing.GasChangeReason) {
 }
+
+func (t *noop) OnGasChangeV2(old, new tracing.Gas, reason tracing.GasChangeReason) {
+}

eth/tracers/native/mux.go

@@ -65,10 +65,11 @@ func newMuxTracerFromConfig(ctx *tracers.Context, cfg json.RawMessage, chainConf
 // the aggregated JSON result returned by GetResult.
 //
 // For hooks that have both a V1 and V2 form (OnCodeChange / OnCodeChangeV2,
-// OnNonceChange / OnNonceChangeV2, OnSystemCallStart / OnSystemCallStartV2),
+// OnNonceChange / OnNonceChangeV2, OnGasChange / OnGasChangeV2,
-// the mux exposes only the V2 variant upward. The fanout then prefers each
+// OnSystemCallStart / OnSystemCallStartV2), the mux exposes only the V2
-// child's V2 hook and falls back to V1 if only V1 is set, mirroring the
+// variant upward. The fanout then prefers each child's V2 hook and falls
-// precedence already used in core/state_processor.go.
+// back to V1 if only V1 is set, mirroring the precedence already used in
+// core/state_processor.go.
 func NewMuxTracer(names []string, objects []*tracers.Tracer) (*tracers.Tracer, error) {
 	t := &muxTracer{names: names, tracers: objects}
 	return &tracers.Tracer{
@@ -79,7 +80,7 @@ func NewMuxTracer(names []string, objects []*tracers.Tracer) (*tracers.Tracer, e
 			OnExit:              t.OnExit,
 			OnOpcode:            t.OnOpcode,
 			OnFault:             t.OnFault,
-			OnGasChange:         t.OnGasChange,
+			OnGasChangeV2:       t.OnGasChangeV2,
 			OnBalanceChange:     t.OnBalanceChange,
 			OnNonceChangeV2:     t.OnNonceChangeV2,
 			OnCodeChangeV2:      t.OnCodeChangeV2,
@@ -109,10 +110,12 @@ func (t *muxTracer) OnFault(pc uint64, op byte, gas, cost uint64, scope tracing.
 	}
 }
 
-func (t *muxTracer) OnGasChange(old, new uint64, reason tracing.GasChangeReason) {
+func (t *muxTracer) OnGasChangeV2(old, new tracing.Gas, reason tracing.GasChangeReason) {
 	for _, t := range t.tracers {
-		if t.OnGasChange != nil {
+		if t.OnGasChangeV2 != nil {
-			t.OnGasChange(old, new, reason)
+			t.OnGasChangeV2(old, new, reason)
+		} else if t.OnGasChange != nil {
+			t.OnGasChange(old.Regular, new.Regular, reason)
 		}
 	}
 }

eth/tracers/native/noop.go

@@ -47,6 +47,7 @@ func newNoopTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *param
 			OnOpcode:        t.OnOpcode,
 			OnFault:         t.OnFault,
 			OnGasChange:     t.OnGasChange,
+			OnGasChangeV2:   t.OnGasChangeV2,
 			OnBalanceChange: t.OnBalanceChange,
 			OnNonceChange:   t.OnNonceChange,
 			OnCodeChange:    t.OnCodeChange,
@@ -66,6 +67,8 @@ func (t *noopTracer) OnFault(pc uint64, op byte, gas, cost uint64, _ tracing.OpC
 
 func (t *noopTracer) OnGasChange(old, new uint64, reason tracing.GasChangeReason) {}
 
+func (t *noopTracer) OnGasChangeV2(old, new tracing.Gas, reason tracing.GasChangeReason) {}
+
 func (t *noopTracer) OnEnter(depth int, typ byte, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
 }