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Bugfix.

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This commit is contained in:
Daniel Kirchner
2022-06-14 18:26:16 +02:00
parent a27b063c10
commit 7a84e9c875
2 changed files with 46 additions and 58 deletions
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libsolidity/codegen/ArrayUtils.cpp
+39 -52
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@@ -50,9 +50,8 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
// stack layout: [source_ref] [source length] target_ref (top)
solAssert(_targetType.location() == DataLocation::Storage, "");
Type const* uint256 = TypeProvider::uint256();
Type const* targetBaseType = _targetType.isByteArrayOrString() ? uint256 : _targetType.baseType();
Type const* sourceBaseType = _sourceType.isByteArrayOrString() ? uint256 : _sourceType.baseType();
Type const* targetBaseType = _targetType.baseType();
Type const* sourceBaseType = _sourceType.baseType();
// TODO unroll loop for small sizes
@@ -68,7 +67,38 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
for (unsigned i = _sourceType.sizeOnStack(); i > 0; --i)
m_context << swapInstruction(i);
// stack: target_ref source_ref [source_length]
// stack: target_ref source_ref [source_length]
if (_targetType.isByteArrayOrString())
{
// stack: target_ref source_ref [source_length]
if (fromCalldata && _sourceType.isDynamicallySized())
{
// stack: target_ref source_ref source_length
m_context << Instruction::SWAP1;
// stack: target_ref source_length source_ref
m_context << Instruction::DUP3;
// stack: target_ref source_length source_ref target_ref
m_context.callYulFunction(
m_context.utilFunctions().copyByteArrayToStorageFunction(_sourceType, _targetType),
3,
0
);
}
else
{
// stack: target_ref source_ref
m_context << Instruction::DUP2;
// stack: target_ref source_ref target_ref
m_context.callYulFunction(
m_context.utilFunctions().copyByteArrayToStorageFunction(_sourceType, _targetType),
2,
0
);
}
// stack: target_ref
return;
}
// retrieve source length
if (_sourceType.location() != DataLocation::CallData || !_sourceType.isDynamicallySized())
retrieveLength(_sourceType); // otherwise, length is already there
@@ -97,10 +127,11 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
utils.retrieveLength(_targetType);
// stack: target_ref source_ref source_length target_ref target_length
if (_targetType.isDynamicallySized())
{
// store new target length
if (!_targetType.isByteArrayOrString())
// Otherwise, length will be stored below.
_context << Instruction::DUP3 << Instruction::DUP3 << Instruction::SSTORE;
solAssert(!_targetType.isByteArrayOrString());
_context << Instruction::DUP3 << Instruction::DUP3 << Instruction::SSTORE;
}
if (sourceBaseType->category() == Type::Category::Mapping)
{
solAssert(targetBaseType->category() == Type::Category::Mapping, "");
@@ -125,51 +156,7 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
// stack: target_ref target_data_end source_length target_data_pos source_ref
evmasm::AssemblyItem copyLoopEndWithoutByteOffset = _context.newTag();
// special case for short byte arrays: Store them together with their length.
if (_targetType.isByteArrayOrString())
{
// stack: target_ref target_data_end source_length target_data_pos source_ref
_context << Instruction::DUP3;
evmasm::AssemblyItem nonEmptyByteArray = _context.appendConditionalJump();
// Empty source, just zero out the main slot.
_context << u256(0) << Instruction::DUP6 << Instruction::SSTORE;
_context.appendJumpTo(copyLoopEndWithoutByteOffset);
_context << nonEmptyByteArray;
// Non-empty source.
// stack: target_ref target_data_end source_length target_data_pos source_ref
_context << Instruction::DUP3 << u256(31) << Instruction::LT;
evmasm::AssemblyItem longByteArray = _context.appendConditionalJump();
// store the short byte array
solAssert(_sourceType.isByteArrayOrString(), "");
if (_sourceType.location() == DataLocation::Storage)
{
// just copy the slot, it contains length and data
_context << Instruction::DUP1 << Instruction::SLOAD;
_context << Instruction::DUP6 << Instruction::SSTORE;
}
else
{
_context << Instruction::DUP1;
CompilerUtils(_context).loadFromMemoryDynamic(*sourceBaseType, fromCalldata, true, false);
// stack: target_ref target_data_end source_length target_data_pos source_ref value
// clear the lower-order byte - which will hold the length
_context << u256(0xff) << Instruction::NOT << Instruction::AND;
// fetch the length and shift it left by one
_context << Instruction::DUP4 << Instruction::DUP1 << Instruction::ADD;
// combine value and length and store them
_context << Instruction::OR << Instruction::DUP6 << Instruction::SSTORE;
}
// end of special case, jump right into cleaning target data area
_context.appendJumpTo(copyLoopEndWithoutByteOffset);
_context << longByteArray;
// Store length (2*length+1)
_context << Instruction::DUP3 << Instruction::DUP1 << Instruction::ADD;
_context << u256(1) << Instruction::ADD;
_context << Instruction::DUP6 << Instruction::SSTORE;
}
solAssert(!_targetType.isByteArrayOrString());
// skip copying if source length is zero
_context << Instruction::DUP3 << Instruction::ISZERO;
_context.appendConditionalJumpTo(copyLoopEndWithoutByteOffset);