cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge pull request #5316 from lazaridiscom/4891-memory-store-asserts

Browse Source 
refine memory-store assertions, closes #4891
This commit is contained in:
chriseth 2018-10-28 20:50:41 +01:00 committed by GitHub
commit 4d82831b06
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 37 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
libsolidity/codegen/CompilerUtils.cpp
View File

@ -142,9 +142,13 @@ void CompilerUtils::storeInMemory(unsigned _offset)
void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBoundaries)
{
// process special types (Reference, StringLiteral, Function)
if (auto ref = dynamic_cast<ReferenceType const*>(&_type))
{
solUnimplementedAssert(ref->location() == DataLocation::Memory, "Only in-memory reference type can be stored.");
solUnimplementedAssert(
ref->location() == DataLocation::Memory,
"Only in-memory reference type can be stored."
);
storeInMemoryDynamic(IntegerType(256), _padToWordBoundaries);
}
else if (auto str = dynamic_cast<StringLiteralType const*>(&_type))
@ -166,18 +170,18 @@ void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBound
m_context << Instruction::DUP2 << Instruction::MSTORE;
m_context << u256(_padToWordBoundaries ? 32 : 24) << Instruction::ADD;
}
else
else if (_type.isValueType())
{
unsigned numBytes = prepareMemoryStore(_type, _padToWordBoundaries);
if (numBytes > 0)
{
solUnimplementedAssert(
_type.sizeOnStack() == 1,
"Memory store of types with stack size != 1 not implemented."
);
m_context << Instruction::DUP2 << Instruction::MSTORE;
m_context << u256(numBytes) << Instruction::ADD;
}
m_context << Instruction::DUP2 << Instruction::MSTORE;
m_context << u256(numBytes) << Instruction::ADD;
}
else // Should never happen
{
solAssert(
false,
"Memory store of type " + _type.toString(true) + " not allowed."
);
}
}
@ -1266,18 +1270,30 @@ void CompilerUtils::rightShiftNumberOnStack(unsigned _bits)
unsigned CompilerUtils::prepareMemoryStore(Type const& _type, bool _padToWords)
{
solAssert(
_type.sizeOnStack() == 1,
"Memory store of types with stack size != 1 not allowed (Type: " + _type.toString(true) + ")."
);
unsigned numBytes = _type.calldataEncodedSize(_padToWords);
solAssert(
numBytes > 0,
"Memory store of 0 bytes requested (Type: " + _type.toString(true) + ")."
);
solAssert(
numBytes <= 32,
"Memory store of more than 32 bytes requested (Type: " + _type.toString(true) + ")."
);
bool leftAligned = _type.category() == Type::Category::FixedBytes;
if (numBytes == 0)
m_context << Instruction::POP;
else
{
solAssert(numBytes <= 32, "Memory store of more than 32 bytes requested.");
convertType(_type, _type, true);
if (numBytes != 32 && !leftAligned && !_padToWords)
// shift the value accordingly before storing
leftShiftNumberOnStack((32 - numBytes) * 8);
}
convertType(_type, _type, true);
if (numBytes != 32 && !leftAligned && !_padToWords)
// shift the value accordingly before storing
leftShiftNumberOnStack((32 - numBytes) * 8);
return numBytes;
}