Merge pull request #8179 from pinkiebell/codegen

libsolidity/codegen: Use calldatacopy to cheaply zero memory..

libsolidity/codegen/CompilerUtils.cpp

@@ -605,7 +605,7 @@ void CompilerUtils::zeroInitialiseMemoryArray(ArrayType const& _type)
 		Whiskers templ(R"({
 			let size := mul(length, <element_size>)
 			// cheap way of zero-initializing a memory range
-			codecopy(memptr, codesize(), size)
+			calldatacopy(memptr, calldatasize(), size)
 			memptr := add(memptr, size)
 		})");
 		templ("element_size", to_string(_type.memoryStride()));

test/libsolidity/SolidityEndToEndTest.cpp

@@ -10131,7 +10131,7 @@ BOOST_AUTO_TEST_CASE(create_dynamic_array_with_zero_length)
 
 BOOST_AUTO_TEST_CASE(correctly_initialize_memory_array_in_constructor)
 {
-	// Memory arrays are initialized using codecopy past the size of the code.
+	// Memory arrays are initialized using calldatacopy past the size of the calldata.
 	// This test checks that it also works in the constructor context.
 	char const* sourceCode = R"(
 		contract C {