Pass return data pointer using callData field

libevmjit/Runtime.cpp

@@ -20,16 +20,16 @@ Runtime::Runtime(RuntimeData* _data, Env* _env) :
 
 bytes_ref Runtime::getReturnData() const
 {
-	// TODO: Handle large indexes
-	auto offset = static_cast<size_t>(m_data.elems[RuntimeData::ReturnDataOffset].a);
+	auto data = m_data.callData;
 	auto size = static_cast<size_t>(m_data.callDataSize);
 
-	assert(offset + size <= m_memory.size() || size == 0);
-	if (offset + size > m_memory.size())
+	if (data < m_memory.data() || data >= m_memory.data() + m_memory.size() || size == 0)
+	{
+		assert(size == 0); // data can be an invalid pointer only if size is 0
 		return {};
+	}
 
-	auto dataBeg = m_memory.data() + offset;
-	return bytes_ref{dataBeg, size};
+	return bytes_ref{data, size};
 }
 
 }

libevmjit/RuntimeData.h

@@ -27,7 +27,6 @@ struct RuntimeData
 
 		_size,
 
-		ReturnDataOffset = CallValue,	// Reuse 2 fields for return data reference
 		SuicideDestAddress = Address,	///< Suicide balance destination address
 	};
 

libevmjit/RuntimeManager.cpp

@@ -127,7 +127,12 @@ void RuntimeManager::set(RuntimeData::Index _index, llvm::Value* _value)
 
 void RuntimeManager::registerReturnData(llvm::Value* _offset, llvm::Value* _size)
 {
-	set(RuntimeData::ReturnDataOffset, _offset);
+	auto memPtr = getBuilder().CreateStructGEP(getRuntimePtr(), 3);
+	auto mem = getBuilder().CreateLoad(memPtr, "memory");
+	auto returnDataPtr = getBuilder().CreateGEP(mem, _offset);
+	auto callDataPtr = getBuilder().CreateStructGEP(getDataPtr(), 1);
+	getBuilder().CreateStore(returnDataPtr, callDataPtr);
+
 	auto ptr = getBuilder().CreateStructGEP(getDataPtr(), 4);
 	assert(ptr->getType() == Type::Size->getPointerTo());
 	assert(_size->getType() == Type::Word);