core/vm, params: implement EXTCODEHASH opcode (#17202)
* core/vm, params: implement EXTCODEHASH opcode * core, params: tiny fixes and polish * core: add function description
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@ -241,6 +241,10 @@ func gasExtCodeCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *Sta
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return gas, nil
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}
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func gasExtCodeHash(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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return gt.ExtcodeHash, nil
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}
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func gasMLoad(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
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var overflow bool
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gas, err := memoryGasCost(mem, memorySize)
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@ -496,6 +496,38 @@ func opExtCodeCopy(pc *uint64, evm *EVM, contract *Contract, memory *Memory, sta
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return nil, nil
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}
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// opExtCodeHash returns the code hash of a specified account.
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// There are several cases when the function is called, while we can relay everything
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// to `state.GetCodeHash` function to ensure the correctness.
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// (1) Caller tries to get the code hash of a normal contract account, state
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// should return the relative code hash and set it as the result.
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//
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// (2) Caller tries to get the code hash of a non-existent account, state should
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// return common.Hash{} and zero will be set as the result.
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//
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// (3) Caller tries to get the code hash for an account without contract code,
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// state should return emptyCodeHash(0xc5d246...) as the result.
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//
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// (4) Caller tries to get the code hash of a precompiled account, the result
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// should be zero or emptyCodeHash.
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//
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// It is worth noting that in order to avoid unnecessary create and clean,
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// all precompile accounts on mainnet have been transferred 1 wei, so the return
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// here should be emptyCodeHash.
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// If the precompile account is not transferred any amount on a private or
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// customized chain, the return value will be zero.
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//
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// (5) Caller tries to get the code hash for an account which is marked as suicided
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// in the current transaction, the code hash of this account should be returned.
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//
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// (6) Caller tries to get the code hash for an account which is marked as deleted,
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// this account should be regarded as a non-existent account and zero should be returned.
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func opExtCodeHash(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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slot := stack.peek()
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slot.SetBytes(evm.StateDB.GetCodeHash(common.BigToAddress(slot)).Bytes())
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return nil, nil
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}
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func opGasprice(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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stack.push(evm.interpreter.intPool.get().Set(evm.GasPrice))
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return nil, nil
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@ -80,6 +80,12 @@ func newConstantinopleInstructionSet() [256]operation {
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validateStack: makeStackFunc(2, 1),
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valid: true,
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}
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instructionSet[EXTCODEHASH] = operation{
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execute: opExtCodeHash,
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gasCost: gasExtCodeHash,
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validateStack: makeStackFunc(1, 1),
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valid: true,
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}
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instructionSet[CREATE2] = operation{
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execute: opCreate2,
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gasCost: gasCreate2,
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@ -90,6 +90,7 @@ const (
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EXTCODECOPY
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RETURNDATASIZE
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RETURNDATACOPY
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EXTCODEHASH
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)
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// 0x40 range - block operations.
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@ -267,6 +268,7 @@ var opCodeToString = map[OpCode]string{
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EXTCODECOPY: "EXTCODECOPY",
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RETURNDATASIZE: "RETURNDATASIZE",
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RETURNDATACOPY: "RETURNDATACOPY",
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EXTCODEHASH: "EXTCODEHASH",
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// 0x40 range - block operations.
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BLOCKHASH: "BLOCKHASH",
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@ -435,6 +437,7 @@ var stringToOp = map[string]OpCode{
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"EXTCODECOPY": EXTCODECOPY,
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"RETURNDATASIZE": RETURNDATASIZE,
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"RETURNDATACOPY": RETURNDATACOPY,
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"EXTCODEHASH": EXTCODEHASH,
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"BLOCKHASH": BLOCKHASH,
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"COINBASE": COINBASE,
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"TIMESTAMP": TIMESTAMP,
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@ -211,6 +211,8 @@ func (c *ChainConfig) GasTable(num *big.Int) GasTable {
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return GasTableHomestead
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}
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switch {
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case c.IsConstantinople(num):
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return GasTableConstantinople
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case c.IsEIP158(num):
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return GasTableEIP158
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case c.IsEIP150(num):
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@ -20,6 +20,7 @@ package params
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type GasTable struct {
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ExtcodeSize uint64
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ExtcodeCopy uint64
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ExtcodeHash uint64
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Balance uint64
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SLoad uint64
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Calls uint64
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@ -63,7 +64,7 @@ var (
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CreateBySuicide: 25000,
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}
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// GasTableEIP158 contain the gas re-prices for
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// the EIP15* phase.
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// the EIP155/EIP158 phase.
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GasTableEIP158 = GasTable{
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ExtcodeSize: 700,
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ExtcodeCopy: 700,
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@ -73,6 +74,20 @@ var (
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Suicide: 5000,
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ExpByte: 50,
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CreateBySuicide: 25000,
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}
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// GasTableConstantinople contain the gas re-prices for
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// the constantinople phase.
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GasTableConstantinople = GasTable{
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ExtcodeSize: 700,
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ExtcodeCopy: 700,
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ExtcodeHash: 400,
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Balance: 400,
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SLoad: 200,
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Calls: 700,
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Suicide: 5000,
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ExpByte: 50,
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CreateBySuicide: 25000,
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}
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)
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