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core/vm: implement RETURNDATA metropolis opcodes

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This commit is contained in:
Jeffrey Wilcke
2017-08-16 13:07:33 +03:00
committed by Péter Szilágyi
parent 76069eef38
commit 9bd6068fef
6 changed files with 253 additions and 171 deletions
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23
core/vm/instructions.go
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@ -31,6 +31,7 @@ import (
var (
bigZero = new(big.Int)
errWriteProtection = errors.New("evm: write protection")
errReadOutOfBound = errors.New("evm: read out of bound")
)
func opAdd(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
@ -360,6 +361,28 @@ func opCalldataCopy(pc *uint64, evm *EVM, contract *Contract, memory *Memory, st
return nil, nil
}
func opReturnDataSize(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().SetUint64(uint64(len(evm.interpreter.returnData))))
return nil, nil
}
func opReturnDataCopy(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
var (
mOff = stack.pop()
cOff = stack.pop()
l = stack.pop()
)
defer evm.interpreter.intPool.put(mOff, cOff, l)
cEnd := new(big.Int).Add(cOff, l)
if cEnd.BitLen() > 64 || uint64(len(evm.interpreter.returnData)) < cEnd.Uint64() {
return nil, errReadOutOfBound
}
memory.Set(mOff.Uint64(), l.Uint64(), evm.interpreter.returnData[cOff.Uint64():cEnd.Uint64()])
return nil, nil
}
func opExtCodeSize(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
a := stack.pop()