Copying calldata directly to memory.

libsolidity/CompilerUtils.cpp

@@ -76,8 +76,16 @@ void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBound
 	if (_type.getCategory() == Type::Category::ByteArray)
 	{
 		auto const& type = dynamic_cast<ByteArrayType const&>(_type);
-		solAssert(type.getLocation() == ByteArrayType::Location::Storage, "Non-storage byte arrays not yet implemented.");
 
+		if (type.getLocation() == ByteArrayType::Location::CallData)
+		{
+			m_context << eth::Instruction::CALLDATASIZE << u256(0) << eth::Instruction::DUP3
+					  << eth::Instruction::CALLDATACOPY
+					  << eth::Instruction::CALLDATASIZE << eth::Instruction::ADD;
+		}
+		else
+		{
+			solAssert(type.getLocation() == ByteArrayType::Location::Storage, "Memory byte arrays not yet implemented.");
 			m_context << eth::Instruction::DUP1 << eth::Instruction::SLOAD;
 			// stack here: memory_offset storage_offset length_bytes
 			// jump to end if length is zero
@@ -106,6 +114,7 @@ void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBound
 			m_context.appendConditionalJumpTo(loopStart);
 			m_context << loopEnd << eth::Instruction::POP << eth::Instruction::POP;
 		}
+	}
 	else
 	{
 		unsigned numBytes = prepareMemoryStore(_type, _padToWordBoundaries);

test/SolidityEndToEndTest.cpp

@@ -2273,6 +2273,21 @@ BOOST_AUTO_TEST_CASE(store_bytes)
 	BOOST_CHECK(callContractFunction("save()", "abcdefg") == encodeArgs(24));
 }
 
+BOOST_AUTO_TEST_CASE(bytes_from_calldata_to_memory)
+{
+	char const* sourceCode = R"(
+		contract C {
+			function() returns (hash) {
+				return sha3("abc", msg.data);
+			}
+		}
+	)";
+	compileAndRun(sourceCode);
+	bytes calldata = bytes(61, 0x22) + bytes(12, 0x12);
+	sendMessage(calldata, false);
+	BOOST_CHECK(m_output == encodeArgs(dev::sha3(bytes{'a', 'b', 'c'} + calldata)));
+}
+
 BOOST_AUTO_TEST_CASE(call_forward_bytes)
 {
 	char const* sourceCode = R"(