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Verkle EXTCODECOPY implementation (#55)

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* core/vm: verkle extcodecopy naive way (do jumpdest analysis on target contract every EXTCODECOPY)

* no double-charge

* address edge-case in touchEachChunksAndChargeGas

* simplify line

Co-authored-by: Guillaume Ballet <3272758+gballet@users.noreply.github.com>
This commit is contained in:
jwasinger
2022-01-13 02:06:21 -10:00
committed by GitHub
parent d761880fd2
commit 952be80177
5 changed files with 29 additions and 22 deletions
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5
core/vm/gas_table.go
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@ -121,7 +121,7 @@ func gasCodeCopy(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memory
uint64Length = 0xffffffffffffffff
}
_, offset, nonPaddedSize := getDataAndAdjustedBounds(contract.Code, uint64CodeOffset, uint64Length)
statelessGas = touchEachChunksAndChargeGas(offset, nonPaddedSize, contract.Address().Bytes()[:], nil, evm.Accesses)
statelessGas = touchEachChunksAndChargeGas(offset, nonPaddedSize, contract.Address().Bytes()[:], nil, nil, evm.Accesses)
}
usedGas, err := gasCodeCopyStateful(evm, contract, stack, mem, memorySize)
return usedGas + statelessGas, err
@ -133,6 +133,7 @@ func gasExtCodeCopy(evm *EVM, contract *Contract, stack *Stack, mem *Memory, mem
var (
codeOffset = stack.Back(2)
length = stack.Back(3)
targetAddr = stack.Back(0).Bytes20()
)
uint64CodeOffset, overflow := codeOffset.Uint64WithOverflow()
if overflow {
@ -148,7 +149,7 @@ func gasExtCodeCopy(evm *EVM, contract *Contract, stack *Stack, mem *Memory, mem
// behavior from CODECOPY which only charges witness access costs for the part of the range
// which overlaps in the account code. TODO: clarify this is desired behavior and amend the
// spec.
statelessGas = touchEachChunksAndChargeGas(uint64CodeOffset, uint64Length, nil, nil, evm.Accesses)
statelessGas = touchEachChunksAndChargeGas(uint64CodeOffset, uint64Length, targetAddr[:], nil, nil, evm.Accesses)
}
usedGas, err := gasExtCodeCopyStateful(evm, contract, stack, mem, memorySize)
return usedGas + statelessGas, err