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feat(evm): added stateful precompile functionnality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package vm | ||
|
|
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| import ( | ||
| "github.com/ethereum/go-ethereum/common" | ||
| ) | ||
|
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| type PrecompileAccessibleState interface { | ||
| GetStateDB() StateDB | ||
| GetBlockContext() BlockContext | ||
| } | ||
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| // StatefulPrecompiledContract is the interface for executing a precompiled contract | ||
| type StatefulPrecompiledContract interface { | ||
| // RequiredGas computes the required gas for the given operation | ||
| RequiredGas(input []byte) uint64 | ||
| // Run executes the precompiled contract. | ||
| Run(accessibleState PrecompileAccessibleState, caller common.Address, addr common.Address, input []byte, suppliedGas uint64, readOnly bool) (ret []byte, remainingGas uint64, err error) | ||
| } | ||
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| // wrappedPrecompiledContract implements StatefulPrecompiledContract by wrapping stateless native precompiled contracts | ||
| // in Ethereum. | ||
| type wrappedPrecompiledContract struct { | ||
| p PrecompiledContract | ||
| } | ||
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| // RequiredGas implements the StatefulPrecompiledContract interface | ||
| func (w *wrappedPrecompiledContract) RequiredGas(input []byte) uint64 { | ||
| return w.p.RequiredGas(input) | ||
| } | ||
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| // Run implements the StatefulPrecompiledContract interface | ||
| func (w *wrappedPrecompiledContract) Run(accessibleState PrecompileAccessibleState, caller common.Address, addr common.Address, input []byte, suppliedGas uint64, readOnly bool) (ret []byte, remainingGas uint64, err error) { | ||
| return RunPrecompiledContract(w.p, input, suppliedGas) | ||
| } | ||
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| // newWrappedPrecompiledContract returns a wrapped version of [PrecompiledContract] to be executed according to the StatefulPrecompiledContract | ||
| // interface. | ||
| func newWrappedPrecompiledContract(p PrecompiledContract) StatefulPrecompiledContract { | ||
| return &wrappedPrecompiledContract{p: p} | ||
| } | ||
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| func RunStatefulPrecompiledContract(sp StatefulPrecompiledContract, accessibleState PrecompileAccessibleState, caller common.Address, addr common.Address, input []byte, suppliedGas uint64, readOnly bool) (ret []byte, remainingGas uint64, err error) { | ||
| gasCost := sp.RequiredGas(input) | ||
| if suppliedGas < gasCost { | ||
| return nil, 0, ErrOutOfGas | ||
| } | ||
| suppliedGas -= gasCost | ||
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| return sp.Run(accessibleState, caller, addr, input, suppliedGas, readOnly) | ||
| } | ||
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| type fheAdd struct{} | ||
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| func (e *fheAdd) RequiredGas(input []byte) uint64 { | ||
| return 8 | ||
| } | ||
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| func (e *fheAdd) Run(accessibleState PrecompileAccessibleState, caller common.Address, addr common.Address, input []byte, suppliedGas uint64, readOnly bool) (ret []byte, remainingGas uint64, err error) { | ||
| // state is editable here, e.g. | ||
| // accessibleState.GetStateDB().SetNonce(caller, 233) | ||
| // will change the caller's (contract that called this precompiled contract) to 233. | ||
|
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| return input, suppliedGas, nil | ||
| } |
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