Merge pull request #15990 from markya0616/sim_backend_block_hash

accounts/abi, core: add AddTxWithChain in BlockGen for simulation

accounts/abi/bind/backends/simulated.go

@@ -307,9 +307,9 @@ func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transa
 
 	blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) {
 		for _, tx := range b.pendingBlock.Transactions() {
-			block.AddTx(tx)
+			block.AddTxWithChain(b.blockchain, tx)
 		}
-		block.AddTx(tx)
+		block.AddTxWithChain(b.blockchain, tx)
 	})
 	statedb, _ := b.blockchain.State()
 

core/chain_makers.go

@@ -82,11 +82,23 @@ func (b *BlockGen) SetExtra(data []byte) {
 // added. Notably, contract code relying on the BLOCKHASH instruction
 // will panic during execution.
 func (b *BlockGen) AddTx(tx *types.Transaction) {
+	b.AddTxWithChain(nil, tx)
+}
+
+// AddTxWithChain adds a transaction to the generated block. If no coinbase has
+// been set, the block's coinbase is set to the zero address.
+//
+// AddTxWithChain panics if the transaction cannot be executed. In addition to
+// the protocol-imposed limitations (gas limit, etc.), there are some
+// further limitations on the content of transactions that can be
+// added. If contract code relies on the BLOCKHASH instruction,
+// the block in chain will be returned.
+func (b *BlockGen) AddTxWithChain(bc *BlockChain, tx *types.Transaction) {
 	if b.gasPool == nil {
 		b.SetCoinbase(common.Address{})
 	}
 	b.statedb.Prepare(tx.Hash(), common.Hash{}, len(b.txs))
-	receipt, _, err := ApplyTransaction(b.config, nil, &b.header.Coinbase, b.gasPool, b.statedb, b.header, tx, &b.header.GasUsed, vm.Config{})
+	receipt, _, err := ApplyTransaction(b.config, bc, &b.header.Coinbase, b.gasPool, b.statedb, b.header, tx, &b.header.GasUsed, vm.Config{})
 	if err != nil {
 		panic(err)
 	}