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Simplify yul conversion function even more.

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This commit is contained in:
chriseth 2021-08-05 13:21:08 +02:00
parent 4480662a58
commit 94c4e1e172
2 changed files with 41 additions and 37 deletions
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74
libsolidity/codegen/YulUtilFunctions.cpp
View File

@ -35,6 +35,16 @@ using namespace solidity;
using namespace solidity::util;
using namespace solidity::frontend;
string YulUtilFunctions::identityFunction()
{
string functionName = "identity";
return m_functionCollector.createFunction("identity", [&](vector<string>& _args, vector<string>& _rets) {
_args.push_back("value");
_rets.push_back("ret");
return "ret := value";
});
}
string YulUtilFunctions::combineExternalFunctionIdFunction()
{
string functionName = "combine_external_function_id";
@ -3272,48 +3282,38 @@ string YulUtilFunctions::conversionFunction(Type const& _from, Type const& _to)
if (rational->isFractional())
solAssert(toCategory == Type::Category::FixedPoint, "");
if (toCategory == Type::Category::FixedBytes)
{
FixedBytesType const& toBytesType = dynamic_cast<FixedBytesType const&>(_to);
body =
Whiskers("converted := <shiftLeft>(<clean>(value))")
("shiftLeft", shiftLeftFunction(256 - toBytesType.numBytes() * 8))
("clean", cleanupFunction(_from))
.render();
}
else if (toCategory == Type::Category::Enum)
body =
Whiskers("converted := <cleanEnum>(<cleanInt>(value))")
("cleanEnum", cleanupFunction(_to))
("cleanInt", cleanupFunction(_from))
.render();
else if (toCategory == Type::Category::FixedPoint)
solUnimplemented("Not yet implemented - FixedPointType.");
else if (toCategory == Type::Category::Address || toCategory == Type::Category::Contract)
if (toCategory == Type::Category::Address || toCategory == Type::Category::Contract)
body =
Whiskers("converted := <convert>(value)")
("convert", conversionFunction(_from, IntegerType(160)))
.render();
else if (toCategory == Type::Category::Integer)
{
IntegerType const& to = dynamic_cast<IntegerType const&>(_to);
// Clean according to the "to" type, except if this is
// a widening conversion.
IntegerType const* cleanupType = &to;
if (fromCategory == Type::Category::Integer)
{
IntegerType const& from = dynamic_cast<IntegerType const&>(_from);
if (to.numBits() > from.numBits())
cleanupType = &from;
}
body =
Whiskers("converted := <cleanInt>(value)")
("cleanInt", cleanupFunction(*cleanupType))
.render();
}
else
solAssert(false, "");
{
Whiskers bodyTemplate("converted := <cleanOutput>(<convert>(<cleanInput>(value)))");
bodyTemplate("cleanInput", cleanupFunction(_from));
bodyTemplate("cleanOutput", cleanupFunction(_to));
string convert;
if (auto const* toFixedBytes = dynamic_cast<FixedBytesType const*>(&_to))
convert = shiftLeftFunction(256 - toFixedBytes->numBytes() * 8);
else if (dynamic_cast<FixedPointType const*>(&_to))
solUnimplementedAssert(false, "");
else if (dynamic_cast<IntegerType const*>(&_to))
{
solUnimplementedAssert(fromCategory != Type::Category::FixedPoint, "");
convert = identityFunction();
}
else if (toCategory == Type::Category::Enum)
{
solAssert(fromCategory != Type::Category::FixedPoint, "");
convert = identityFunction();
}
else
solAssert(false, "");
solAssert(!convert.empty(), "");
bodyTemplate("convert", convert);
body = bodyTemplate.render();
}
break;
}
case Type::Category::Bool:

4
libsolidity/codegen/YulUtilFunctions.h
View File

@ -59,6 +59,10 @@ public:
m_functionCollector(_functionCollector)
{}
/// @returns the name of a function that returns its argument.
/// Sometimes needed to satisfy templates.
std::string identityFunction();
/// @returns a function that combines the address and selector to a single value
/// for use in the ABI.
std::string combineExternalFunctionIdFunction();