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| author | chriseth <chris@ethereum.org> | 2018-04-12 06:39:20 +0800 |
|---|---|---|
| committer | chriseth <chris@ethereum.org> | 2018-04-16 18:47:38 +0800 |
| commit | 4c1d39b7a2bc9e58436da0bf85edf5cd74d5a882 (patch) | |
| tree | 7c75fe2be27af64c309e8dc8bcda00a74adbc361 /libsolidity | |
| parent | d8030c9b2ad0965d7de2637982005da9f4b6b93a (diff) | |
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Properly force-clean for shortening bytesXX conversions.
Diffstat (limited to 'libsolidity')
| -rw-r--r-- | libsolidity/codegen/CompilerUtils.cpp | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/libsolidity/codegen/CompilerUtils.cpp b/libsolidity/codegen/CompilerUtils.cpp index b4550153..4af7d905 100644 --- a/libsolidity/codegen/CompilerUtils.cpp +++ b/libsolidity/codegen/CompilerUtils.cpp @@ -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) { |