internal, accounts, eth: utilize vm failed flag to help gas estimation

1 files changed, 13 insertions, 11 deletions

diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index d6d16eb3f..0621e81c2 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -168,7 +168,7 @@ func (b *SimulatedBackend) CallContract(ctx context.Context, call ethereum.CallM
 	if err != nil {
 		return nil, err
 	}
-	rval, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
+	rval, _, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
 	return rval, err
 }
 
@@ -178,7 +178,7 @@ func (b *SimulatedBackend) PendingCallContract(ctx context.Context, call ethereu
 	defer b.mu.Unlock()
 	defer b.pendingState.RevertToSnapshot(b.pendingState.Snapshot())
 
-	rval, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
+	rval, _, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
 	return rval, err
 }
 
@@ -204,8 +204,11 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 	defer b.mu.Unlock()
 
 	// Binary search the gas requirement, as it may be higher than the amount used
-	var lo, hi uint64
-	if call.Gas != nil {
+	var (
+		lo uint64 = params.TxGas - 1
+		hi uint64
+	)
+	if call.Gas != nil && call.Gas.Uint64() >= params.TxGas {
 		hi = call.Gas.Uint64()
 	} else {
 		hi = b.pendingBlock.GasLimit().Uint64()
@@ -216,11 +219,11 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 		call.Gas = new(big.Int).SetUint64(mid)
 
 		snapshot := b.pendingState.Snapshot()
-		_, gas, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
+		_, _, failed, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
 		b.pendingState.RevertToSnapshot(snapshot)
 
-		// If the transaction became invalid or used all the gas (failed), raise the gas limit
-		if err != nil || gas.Cmp(call.Gas) == 0 {
+		// If the transaction became invalid or execution failed, raise the gas limit
+		if err != nil || failed {
 			lo = mid
 			continue
 		}
@@ -232,7 +235,7 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 
 // callContract implemens common code between normal and pending contract calls.
 // state is modified during execution, make sure to copy it if necessary.
-func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, *big.Int, error) {
+func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, *big.Int, bool, error) {
 	// Ensure message is initialized properly.
 	if call.GasPrice == nil {
 		call.GasPrice = big.NewInt(1)
@@ -254,9 +257,8 @@ func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallM
 	// about the transaction and calling mechanisms.
 	vmenv := vm.NewEVM(evmContext, statedb, b.config, vm.Config{})
 	gaspool := new(core.GasPool).AddGas(math.MaxBig256)
-	// TODO utilize returned failed flag to help gas estimation.
-	ret, gasUsed, _, _, err := core.NewStateTransition(vmenv, msg, gaspool).TransitionDb()
-	return ret, gasUsed, err
+	ret, gasUsed, _, failed, err := core.NewStateTransition(vmenv, msg, gaspool).TransitionDb()
+	return ret, gasUsed, failed, err
 }
 
 // SendTransaction updates the pending block to include the given transaction.