SSTORE: function (key, val, runState, cb) {
var stateManager = runState.stateManager
var address = runState.address
key = utils.setLengthLeft(key, 32)
var value = utils.unpad(val)
stateManager.getContractStorage(runState.address, key, function (err, found) {
if (err) return cb(err)
try {
if (value.length === 0 && !found.length) {
subGas(runState, new BN(fees.sstoreResetGas.v))
} else if (value.length === 0 && found.length) {
subGas(runState, new BN(fees.sstoreResetGas.v))
runState.gasRefund.iadd(new BN(fees.sstoreRefundGas.v))
} else if (value.length !== 0 && !found.length) {
subGas(runState, new BN(fees.sstoreSetGas.v))
} else if (value.length !== 0 && found.length) {
subGas(runState, new BN(fees.sstoreResetGas.v))
}
} catch (e) {
cb(e.error)
return
}
stateManager.putContractStorage(address, key, value, function (err) {
if (err) return cb(err)
runState.contract = stateManager.cache.get(address)
cb()
})
})
},
self._fetchStorage(keyHex, function (err, rawValue) {
if (err) return cb(err);
var value = ethUtil.toBuffer(rawValue);
value = ethUtil.unpad(value);
var encodedValue = ethUtil.rlp.encode(value);
cb(null, encodedValue);
});
PUSH: function (runState) {
var numToPush = runState.opCode - 0x5f
var loaded = utils.unpad(runState.code.slice(runState.programCounter, runState.programCounter + numToPush))
runState.stack.push(loaded)
runState.programCounter += numToPush
},
MLOAD: function (runState) {
var pos = utils.bufferToInt(runState.stack.pop())
var loaded = utils.unpad(memLoad(runState, pos, 32))
if (loaded === ERROR.OUT_OF_GAS) {
return loaded
}
runState.stack.push(loaded)
},
BLOCKHASH: function (runState, cb) {
var stateManager = runState.stateManager
var number = utils.unpad(runState.stack.pop())
var diff = utils.bufferToInt(runState.block.header.number) - utils.bufferToInt(number)
// block lookups must be within the past 256 blocks
if (diff > 256 || diff <= 0) {
runState.stack.push(new Buffer([0]))
cb()
return
}
stateManager.getBlockHashByNumber(number, function (err, blockHash) {
if (err) return cb(err)
runState.stack.push(blockHash)
cb()
})
},
SSTORE: function (runState, cb) {
var stateManager = runState.stateManager
var address = runState.address
var key = utils.pad(runState.stack.pop(), 32)
var value = utils.unpad(runState.stack.pop())
// format input
if (value.length === 0) {
// deleting a value
// set empty buffer to empty string
value = ''
} else {
value = rlp.encode(value)
}
stateManager.getContractStorage(runState.address, key, function (err, found) {
if (err) return cb(err)
// calculate gas cost
if (value === '' && !found) {
runState.gasLeft = runState.gasLeft.sub(new BN(fees.sstoreResetGas.v))
} else if (value === '' && found) {
runState.gasLeft = runState.gasLeft.sub(new BN(fees.sstoreResetGas.v))
runState.gasRefund = runState.gasRefund.add(new BN(fees.sstoreRefundGas.v))
} else if (value !== '' && !found) {
runState.gasLeft = runState.gasLeft.sub(new BN(fees.sstoreSetGas.v))
} else if (value !== '' && found) {
runState.gasLeft = runState.gasLeft.sub(new BN(fees.sstoreResetGas.v))
}
stateManager.putContractStorage(address, key, value, function () {
runState.contract = stateManager.cache.get(address)
cb()
})
})
},
MLOAD: function (pos, runState) {
pos = utils.bufferToInt(pos)
var loaded = utils.unpad(memLoad(runState, pos, 32))
return loaded
},
EQ: function (a, b, runState) {
a = utils.unpad(a)
b = utils.unpad(b)
return new Buffer([a.toString('hex') === b.toString('hex')])
},
EQ: function (runState) {
const a = utils.unpad(runState.stack.pop())
const b = utils.unpad(runState.stack.pop())
runState.stack.push(new Buffer([a.toString('hex') === b.toString('hex')]))
},