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Move ABI encoder into its own function.

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chriseth authored and Alex Beregszaszi committed 2017-09-15 20:46:32 +01:00
1 parent 73771f5bb2
commit 80ce3ca66f
6 files changed
+82 -65
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libsolidity/codegen/ABIFunctions.cpp
+56 -48
View File
@@ -30,65 +30,73 @@ using namespace std;
using namespace dev;
using namespace dev::solidity;
ABIFunctions::~ABIFunctions()
{
// This throws an exception and thus might cause immediate termination, but hey,
// it's a failed assertion anyway :-)
solAssert(m_requestedFunctions.empty(), "Forgot to call ``requestedFunctions()``.");
}
string ABIFunctions::tupleEncoder(
TypePointers const& _givenTypes,
TypePointers const& _targetTypes,
bool _encodeAsLibraryTypes
)
{
// stack: <$value0> <$value1> ... <$value(n-1)> <$headStart>
string functionName = string("abi_encode_tuple_");
for (auto const& t: _givenTypes)
functionName += t->identifier() + "_";
functionName += "_to_";
for (auto const& t: _targetTypes)
functionName += t->identifier() + "_";
if (_encodeAsLibraryTypes)
functionName += "_library";
solAssert(!_givenTypes.empty(), "");
size_t const headSize_ = headSize(_targetTypes);
return createFunction(functionName, [&]() {
solAssert(!_givenTypes.empty(), "");
Whiskers encoder(R"(
// Note that the values are in reverse due to the difference in calling semantics.
Whiskers templ(R"(
function <functionName>(headStart <valueParams>) -> tail {
tail := add(headStart, <headSize>)
<encodeElements>
}
)");
templ("functionName", functionName);
size_t const headSize_ = headSize(_targetTypes);
templ("headSize", to_string(headSize_));
string valueParams;
string encodeElements;
size_t headPos = 0;
size_t stackPos = 0;
for (size_t i = 0; i < _givenTypes.size(); ++i)
{
let tail := add($headStart, <headSize>)
<encodeElements>
<deepestStackElement> := tail
solAssert(_givenTypes[i], "");
solAssert(_targetTypes[i], "");
size_t sizeOnStack = _givenTypes[i]->sizeOnStack();
string valueNames = "";
for (size_t j = 0; j < sizeOnStack; j++)
{
valueNames += "value" + to_string(stackPos) + ", ";
valueParams = ", value" + to_string(stackPos) + valueParams;
stackPos++;
}
bool dynamic = _targetTypes[i]->isDynamicallyEncoded();
Whiskers elementTempl(
dynamic ?
string(R"(
mstore(add(headStart, <pos>), sub(tail, headStart))
tail := <abiEncode>(<values> tail)
)") :
string(R"(
<abiEncode>(<values> add(headStart, <pos>))
)")
);
elementTempl("values", valueNames);
elementTempl("pos", to_string(headPos));
elementTempl("abiEncode", abiEncodingFunction(*_givenTypes[i], *_targetTypes[i], _encodeAsLibraryTypes, false));
encodeElements += elementTempl.render();
headPos += dynamic ? 0x20 : _targetTypes[i]->calldataEncodedSize();
}
)");
encoder("headSize", to_string(headSize_));
string encodeElements;
size_t headPos = 0;
size_t stackPos = 0;
for (size_t i = 0; i < _givenTypes.size(); ++i)
{
solAssert(_givenTypes[i], "");
solAssert(_targetTypes[i], "");
size_t sizeOnStack = _givenTypes[i]->sizeOnStack();
string valueNames = "";
for (size_t j = 0; j < sizeOnStack; j++)
valueNames += "$value" + to_string(stackPos++) + ", ";
bool dynamic = _targetTypes[i]->isDynamicallyEncoded();
Whiskers elementTempl(
dynamic ?
string(R"(
mstore(add($headStart, <pos>), sub(tail, $headStart))
tail := <abiEncode>(<values> tail)
)") :
string(R"(
<abiEncode>(<values> add($headStart, <pos>))
)")
);
elementTempl("values", valueNames);
elementTempl("pos", to_string(headPos));
elementTempl("abiEncode", abiEncodingFunction(*_givenTypes[i], *_targetTypes[i], _encodeAsLibraryTypes, false));
encodeElements += elementTempl.render();
headPos += dynamic ? 0x20 : _targetTypes[i]->calldataEncodedSize();
}
solAssert(headPos == headSize_, "");
encoder("encodeElements", encodeElements);
encoder("deepestStackElement", stackPos > 0 ? "$value0" : "$headStart");
solAssert(headPos == headSize_, "");
templ("valueParams", valueParams);
templ("encodeElements", encodeElements);
return encoder.render();
return templ.render();
});
}
string ABIFunctions::requestedFunctions()