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@ -26,6 +26,7 @@ import ( |
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"github.com/ethereum/go-ethereum/params" |
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) |
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// Execution is the execution environment for the given call or create action.
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type Execution struct { |
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env vm.Environment |
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address *common.Address |
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@ -35,12 +36,15 @@ type Execution struct { |
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Gas, price, value *big.Int |
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} |
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// NewExecution returns a new execution environment that handles all calling
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// and creation logic defined by the YP.
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func NewExecution(env vm.Environment, address *common.Address, input []byte, gas, gasPrice, value *big.Int) *Execution { |
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exe := &Execution{env: env, address: address, input: input, Gas: gas, price: gasPrice, value: value} |
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exe.evm = vm.NewVm(env) |
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return exe |
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} |
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// Call executes within the given context
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func (self *Execution) Call(codeAddr common.Address, caller vm.ContextRef) ([]byte, error) { |
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// Retrieve the executing code
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code := self.env.State().GetCode(codeAddr) |
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@ -48,6 +52,9 @@ func (self *Execution) Call(codeAddr common.Address, caller vm.ContextRef) ([]by |
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return self.exec(&codeAddr, code, caller) |
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} |
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// Create creates a new contract and runs the initialisation procedure of the
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// contract. This returns the returned code for the contract and is stored
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// elsewhere.
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func (self *Execution) Create(caller vm.ContextRef) (ret []byte, err error, account *state.StateObject) { |
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// Input must be nil for create
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code := self.input |
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@ -63,16 +70,24 @@ func (self *Execution) Create(caller vm.ContextRef) (ret []byte, err error, acco |
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return |
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} |
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// exec executes the given code and executes within the contextAddr context.
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func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm.ContextRef) (ret []byte, err error) { |
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env := self.env |
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evm := self.evm |
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// Depth check execution. Fail if we're trying to execute above the
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// limit.
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if env.Depth() > int(params.CallCreateDepth.Int64()) { |
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caller.ReturnGas(self.Gas, self.price) |
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return nil, vm.DepthError |
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} |
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vsnapshot := env.State().Copy() |
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if !env.CanTransfer(env.State().GetStateObject(caller.Address()), self.value) { |
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caller.ReturnGas(self.Gas, self.price) |
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return nil, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", self.value, env.State().GetBalance(caller.Address())) |
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} |
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var createAccount bool |
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if self.address == nil { |
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// Generate a new address
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@ -95,15 +110,7 @@ func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm. |
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} else { |
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to = env.State().GetOrNewStateObject(*self.address) |
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} |
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err = env.Transfer(from, to, self.value) |
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if err != nil { |
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env.State().Set(vsnapshot) |
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caller.ReturnGas(self.Gas, self.price) |
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return nil, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance()) |
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} |
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vm.Transfer(from, to, self.value) |
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context := vm.NewContext(caller, to, self.value, self.Gas, self.price) |
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context.SetCallCode(contextAddr, code) |
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