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Properly force-clean for shortening bytesXX conversions.

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This commit is contained in:
chriseth 2018-04-12 00:39:20 +02:00
parent d8030c9b2a
commit 4c1d39b7a2
2 changed files with 10 additions and 10 deletions
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1
Changelog.md
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@ -30,6 +30,7 @@ Bugfixes:
* Code Generator: Bugfix in modifier lookup in libraries.
* Code Generator: Implement packed encoding of external function types.
* Code Generator: Treat empty base constructor argument list as not provided.
* Code Generator: Properly force-clean bytesXX types for shortening conversions.
* Commandline interface: Fix error messages for imported files that do not exist.
* Commandline interface: Support ``--evm-version constantinople`` properly.
* DocString Parser: Fix error message for empty descriptions.

19
libsolidity/codegen/CompilerUtils.cpp
View File

@ -684,19 +684,17 @@ void CompilerUtils::convertType(
// clear for conversion to longer bytes
solAssert(targetTypeCategory == Type::Category::FixedBytes, "Invalid type conversion requested.");
FixedBytesType const& targetType = dynamic_cast<FixedBytesType const&>(_targetType);
if (targetType.numBytes() > typeOnStack.numBytes() || _cleanupNeeded)
if (typeOnStack.numBytes() == 0 || targetType.numBytes() == 0)
m_context << Instruction::POP << u256(0);
else if (targetType.numBytes() > typeOnStack.numBytes() || _cleanupNeeded)
{
if (typeOnStack.numBytes() == 0)
m_context << Instruction::POP << u256(0);
else
{
m_context << ((u256(1) << (256 - typeOnStack.numBytes() * 8)) - 1);
m_context << Instruction::NOT << Instruction::AND;
}
int bytes = min(typeOnStack.numBytes(), targetType.numBytes());
m_context << ((u256(1) << (256 - bytes * 8)) - 1);
m_context << Instruction::NOT << Instruction::AND;
}
}
}
break;
}
case Type::Category::Enum:
solAssert(_targetType == _typeOnStack || targetTypeCategory == Type::Category::Integer, "");
if (enumOverflowCheckPending)
@ -798,8 +796,9 @@ void CompilerUtils::convertType(
bytesConstRef data(value);
if (targetTypeCategory == Type::Category::FixedBytes)
{
int const numBytes = dynamic_cast<FixedBytesType const&>(_targetType).numBytes();
solAssert(data.size() <= 32, "");
m_context << h256::Arith(h256(data, h256::AlignLeft));
m_context << (h256::Arith(h256(data, h256::AlignLeft)) & (~(u256(-1) >> (8 * numBytes))));
}
else if (targetTypeCategory == Type::Category::Array)
{