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[Sol - Yul] Add support for ripemd160 & ecrecover.

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This commit is contained in:
Alexander Arlt
2020-05-14 10:44:39 -05:00
parent b2122d479f
commit 91e9d54c71
8 changed files with 77 additions and 8 deletions
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libsolidity/codegen/ir/IRGeneratorForStatements.cpp
+63 -8
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@@ -952,14 +952,6 @@ void IRGeneratorForStatements::endVisit(FunctionCall const& _functionCall)
"))\n";
break;
}
case FunctionType::Kind::ECRecover:
case FunctionType::Kind::SHA256:
case FunctionType::Kind::RIPEMD160:
{
solAssert(!_functionCall.annotation().tryCall, "");
appendExternalFunctionCall(_functionCall, arguments);
break;
}
case FunctionType::Kind::ArrayPop:
{
auto const& memberAccessExpression = dynamic_cast<MemberAccess const&>(_functionCall.expression()).expression();
@@ -1153,6 +1145,69 @@ void IRGeneratorForStatements::endVisit(FunctionCall const& _functionCall)
break;
}
case FunctionType::Kind::ECRecover:
case FunctionType::Kind::RIPEMD160:
case FunctionType::Kind::SHA256:
{
solAssert(!_functionCall.annotation().tryCall, "");
solAssert(!functionType->valueSet(), "");
solAssert(!functionType->gasSet(), "");
solAssert(!functionType->bound(), "");
static map<FunctionType::Kind, std::tuple<u160, size_t>> precompiles = {
{FunctionType::Kind::ECRecover, std::make_tuple(1, 0)},
{FunctionType::Kind::SHA256, std::make_tuple(2, 0)},
{FunctionType::Kind::RIPEMD160, std::make_tuple(3, 12)},
};
auto [ address, offset ] = precompiles[functionType->kind()];
TypePointers argumentTypes;
vector<string> argumentStrings;
for (auto const& arg: arguments)
{
argumentTypes.emplace_back(&type(*arg));
argumentStrings += IRVariable(*arg).stackSlots();
}
Whiskers templ(R"(
let <pos> := <allocateTemporary>()
let <end> := <encodeArgs>(<pos> <argumentString>)
<?isECRecover>
mstore(0, 0)
</isECRecover>
let <success> := <call>(<gas>, <address> <?isCall>, 0</isCall>, <pos>, sub(<end>, <pos>), 0, 32)
if iszero(<success>) { <forwardingRevert>() }
let <retVars> := <shl>(mload(0))
)");
templ("call", m_context.evmVersion().hasStaticCall() ? "staticcall" : "call");
templ("isCall", !m_context.evmVersion().hasStaticCall());
templ("shl", m_utils.shiftLeftFunction(offset * 8));
templ("allocateTemporary", m_utils.allocationTemporaryMemoryFunction());
templ("pos", m_context.newYulVariable());
templ("end", m_context.newYulVariable());
templ("isECRecover", FunctionType::Kind::ECRecover == functionType->kind());
if (FunctionType::Kind::ECRecover == functionType->kind())
templ("encodeArgs", m_context.abiFunctions().tupleEncoder(argumentTypes, parameterTypes));
else
templ("encodeArgs", m_context.abiFunctions().tupleEncoderPacked(argumentTypes, parameterTypes));
templ("argumentString", joinHumanReadablePrefixed(argumentStrings));
templ("address", toString(address));
templ("success", m_context.newYulVariable());
templ("retVars", IRVariable(_functionCall).commaSeparatedList());
templ("forwardingRevert", m_utils.forwardingRevertFunction());
if (m_context.evmVersion().canOverchargeGasForCall())
// Send all gas (requires tangerine whistle EVM)
templ("gas", "gas()");
else
{
// @todo The value 10 is not exact and this could be fine-tuned,
// but this has worked for years in the old code generator.
u256 gasNeededByCaller = evmasm::GasCosts::callGas(m_context.evmVersion()) + 10 + evmasm::GasCosts::callNewAccountGas;
templ("gas", "sub(gas(), " + formatNumber(gasNeededByCaller) + ")");
}
m_code << templ.render();
break;
}
default:
solUnimplemented("FunctionKind " + toString(static_cast<int>(functionType->kind())) + " not yet implemented");
}