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author | Jeffrey Wilcke <jeffrey@ethereum.org> | 2017-08-15 16:23:23 +0800 |
---|---|---|
committer | Péter Szilágyi <peterke@gmail.com> | 2017-08-15 18:03:49 +0800 |
commit | 3d123bcde67973b57c0a9e7edc219cc2ea589443 (patch) | |
tree | e806ab2faae07184fdcdfe23488b7111e75a9057 /core/vm/evm.go | |
parent | 9facf6423dbd38ebd7fbd9069cbcb98b0fd243c2 (diff) | |
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core/vm: implement metropolis static call opcode
Diffstat (limited to 'core/vm/evm.go')
-rw-r--r-- | core/vm/evm.go | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/core/vm/evm.go b/core/vm/evm.go index b8af9bd15..97a9d3105 100644 --- a/core/vm/evm.go +++ b/core/vm/evm.go @@ -245,6 +245,51 @@ func (evm *EVM) DelegateCall(caller ContractRef, addr common.Address, input []by return ret, contract.Gas, err } +func (evm *EVM) StaticCall(caller ContractRef, addr common.Address, input []byte, gas uint64) (ret []byte, leftOverGas uint64, err error) { + if evm.vmConfig.NoRecursion && evm.depth > 0 { + return nil, gas, nil + } + + // Depth check execution. Fail if we're trying to execute above the + // limit. + if evm.depth > int(params.CallCreateDepth) { + return nil, gas, ErrDepth + } + + // make sure the readonly is only set if we aren't in readonly yet + // this makes also sure that the readonly flag isn't removed for + // child calls. + if !evm.interpreter.readonly { + evm.interpreter.readonly = true + defer func() { evm.interpreter.readonly = false }() + } + + var ( + to = AccountRef(addr) + snapshot = evm.StateDB.Snapshot() + ) + if !evm.StateDB.Exist(addr) { + return nil, gas, nil + } + + // initialise a new contract and set the code that is to be used by the + // EVM. The contract is a scoped evmironment for this execution context + // only. + contract := NewContract(caller, to, new(big.Int), gas) + contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr)) + + ret, err = evm.interpreter.Run(snapshot, contract, input) + // When an error was returned by the EVM or when setting the creation code + // above we revert to the snapshot and consume any gas remaining. Additionally + // when we're in homestead this also counts for code storage gas errors. + if err != nil { + contract.UseGas(contract.Gas) + + evm.StateDB.RevertToSnapshot(snapshot) + } + return ret, contract.Gas, err +} + // Create creates a new contract using code as deployment code. func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) { if evm.vmConfig.NoRecursion && evm.depth > 0 { |