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Code generation for creating arrays.

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chriseth
2015-11-26 13:10:12 +01:00
parent bf55aa6ae2
commit 879844dd0a
4 changed files with 111 additions and 9 deletions
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libsolidity/codegen/ExpressionCompiler.cpp
+47
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@@ -703,6 +703,53 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
StorageByteArrayElement(m_context).storeValue(*type, _functionCall.location(), true);
break;
}
case Location::ObjectCreation:
{
// Will allocate at the end of memory (MSIZE) and not write at all unless the base
// type is dynamically sized.
ArrayType const& arrayType = dynamic_cast<ArrayType const&>(*_functionCall.annotation().type);
_functionCall.expression().accept(*this);
solAssert(arguments.size() == 1, "");
// Fetch requested length.
arguments[0]->accept(*this);
utils().convertType(*arguments[0]->annotation().type, IntegerType(256));
// Stack: requested_length
// Allocate at max(MSIZE, freeMemoryPointer)
utils().fetchFreeMemoryPointer();
m_context << eth::Instruction::DUP1 << eth::Instruction::MSIZE;
m_context << eth::Instruction::LT;
auto initialise = m_context.appendConditionalJump();
// Free memory pointer does not point to empty memory, use MSIZE.
m_context << eth::Instruction::POP;
m_context << eth::Instruction::MSIZE;
m_context << initialise;
// Stack: requested_length memptr
m_context << eth::Instruction::SWAP1;
// Stack: memptr requested_length
// store length
m_context << eth::Instruction::DUP1 << eth::Instruction::DUP3 << eth::Instruction::MSTORE;
// Stack: memptr requested_length
// update free memory pointer
m_context << eth::Instruction::DUP1 << arrayType.baseType()->memoryHeadSize();
m_context << eth::Instruction::MUL << u256(32) << eth::Instruction::ADD;
m_context << eth::Instruction::DUP3 << eth::Instruction::ADD;
utils().storeFreeMemoryPointer();
// Stack: memptr requested_length
// We only have to initialise if the base type is a not a value type.
if (dynamic_cast<ReferenceType const*>(arrayType.baseType().get()))
{
m_context << eth::Instruction::DUP2 << u256(32) << eth::Instruction::ADD;
utils().zeroInitialiseMemoryArray(arrayType);
m_context << eth::Instruction::POP;
}
else
m_context << eth::Instruction::POP;
break;
}
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid function type."));
}