Merge pull request ethereum#13 from OffchainLabs/stylus-hostio

Add stylus hooks for hostio

core/vm/instructions_arbitrum.go

@@ -0,0 +1,50 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package vm
+
+import (
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/common"
+)
+
+// adaptation of opBlockHash that doesn't require an EVM stack
+func BlockHashOp(evm *EVM, block *big.Int) common.Hash {
+ if !block.IsUint64() {
+ return common.Hash{}
+ }
+ num64 := block.Uint64()
+ upper, err := evm.ProcessingHook.L1BlockNumber(evm.Context)
+ if err != nil {
+ return common.Hash{}
+ }
+
+ var lower uint64
+ if upper < 257 {
+ lower = 0
+ } else {
+ lower = upper - 256
+ }
+ if num64 >= lower && num64 < upper {
+ hash, err := evm.ProcessingHook.L1BlockHash(evm.Context, num64)
+ if err != nil {
+ return common.Hash{}
+ }
+ return hash
+ }
+ return common.Hash{}
+}

core/vm/operations_acl_arbitrum.go

@@ -142,3 +142,13 @@ func WasmCallCost(db StateDB, contract common.Address, value *big.Int, budget ui
  }
  return total, nil
 }
+
+// Computes the cost of touching an account in wasm
+// Note: the code here is adapted from gasEip2929AccountCheck with the most recent parameters as of The Merge
+func WasmAccountTouchCost(db StateDB, addr common.Address) uint64 {
+ if !db.AddressInAccessList(addr) {
+ db.AddAddressToAccessList(addr)
+ return params.ColdAccountAccessCostEIP2929
+ }
+ return params.WarmStorageReadCostEIP2929
+}