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Copying calldata directly to memory.

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Christian 2015-02-13 01:29:21 +01:00
parent 1c3c1f1e5d
commit 56c6eaf509
1 changed files with 36 additions and 27 deletions
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63
CompilerUtils.cpp
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@ -76,35 +76,44 @@ void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBound
if (_type.getCategory() == Type::Category::ByteArray) if (_type.getCategory() == Type::Category::ByteArray)
{ {
auto const& type = dynamic_cast<ByteArrayType const&>(_type); auto const& type = dynamic_cast<ByteArrayType const&>(_type);
solAssert(type.getLocation() == ByteArrayType::Location::Storage, "Non-storage byte arrays not yet implemented.");
m_context << eth::Instruction::DUP1 << eth::Instruction::SLOAD; if (type.getLocation() == ByteArrayType::Location::CallData)
// stack here: memory_offset storage_offset length_bytes {
// jump to end if length is zero m_context << eth::Instruction::CALLDATASIZE << u256(0) << eth::Instruction::DUP3
m_context << eth::Instruction::DUP1 << eth::Instruction::ISZERO; << eth::Instruction::CALLDATACOPY
eth::AssemblyItem loopEnd = m_context.newTag(); << eth::Instruction::CALLDATASIZE << eth::Instruction::ADD;
m_context.appendConditionalJumpTo(loopEnd); }
// compute memory end offset else
m_context << eth::Instruction::DUP3 << eth::Instruction::ADD << eth::Instruction::SWAP2; {
// actual array data is stored at SHA3(storage_offset) solAssert(type.getLocation() == ByteArrayType::Location::Storage, "Memory byte arrays not yet implemented.");
m_context << eth::Instruction::SWAP1; m_context << eth::Instruction::DUP1 << eth::Instruction::SLOAD;
CompilerUtils(m_context).computeHashStatic(); // stack here: memory_offset storage_offset length_bytes
m_context << eth::Instruction::SWAP1; // jump to end if length is zero
m_context << eth::Instruction::DUP1 << eth::Instruction::ISZERO;
eth::AssemblyItem loopEnd = m_context.newTag();
m_context.appendConditionalJumpTo(loopEnd);
// compute memory end offset
m_context << eth::Instruction::DUP3 << eth::Instruction::ADD << eth::Instruction::SWAP2;
// actual array data is stored at SHA3(storage_offset)
m_context << eth::Instruction::SWAP1;
CompilerUtils(m_context).computeHashStatic();
m_context << eth::Instruction::SWAP1;
// stack here: memory_end_offset storage_data_offset memory_offset // stack here: memory_end_offset storage_data_offset memory_offset
eth::AssemblyItem loopStart = m_context.newTag(); eth::AssemblyItem loopStart = m_context.newTag();
m_context << loopStart m_context << loopStart
// load and store // load and store
<< eth::Instruction::DUP2 << eth::Instruction::SLOAD << eth::Instruction::DUP2 << eth::Instruction::SLOAD
<< eth::Instruction::DUP2 << eth::Instruction::MSTORE << eth::Instruction::DUP2 << eth::Instruction::MSTORE
// increment storage_data_offset by 1 // increment storage_data_offset by 1
<< eth::Instruction::SWAP1 << u256(1) << eth::Instruction::ADD << eth::Instruction::SWAP1 << u256(1) << eth::Instruction::ADD
// increment memory offset by 32 // increment memory offset by 32
<< eth::Instruction::SWAP1 << u256(32) << eth::Instruction::ADD << eth::Instruction::SWAP1 << u256(32) << eth::Instruction::ADD
// check for loop condition // check for loop condition
<< eth::Instruction::DUP1 << eth::Instruction::DUP4 << eth::Instruction::GT; << eth::Instruction::DUP1 << eth::Instruction::DUP4 << eth::Instruction::GT;
m_context.appendConditionalJumpTo(loopStart); m_context.appendConditionalJumpTo(loopStart);
m_context << loopEnd << eth::Instruction::POP << eth::Instruction::POP; m_context << loopEnd << eth::Instruction::POP << eth::Instruction::POP;
}
} }
else else
{ {