GP-4886 Do not assign storage for DEFAULT/unassigned datatype and create

undefined-typedef instead of DWORD-typedef as a default named type when
demangling.

Ghidra/Features/Base/src/main/java/ghidra/app/util/demangler/DemangledDataType.java

@@ -95,8 +95,8 @@ public class DemangledDataType extends DemangledType {
 	private static final String UNSIGNED_LONG = "unsigned long";
 
 	public final static String[] PRIMITIVES =
-		{ VOID, BOOL, CHAR, WCHAR_T, WCHAR16, WCHAR32, CHAR8_T, SHORT, INT, INT0_T, LONG,
+		{ VOID, BOOL, CHAR, WCHAR_T, WCHAR16, WCHAR32, CHAR8_T, SHORT, INT, INT0_T, LONG, LONG_LONG,
-			LONG_LONG, FLOAT, FLOAT2, DOUBLE, INT128, FLOAT128, LONG_DOUBLE, };
+			FLOAT, FLOAT2, DOUBLE, INT128, FLOAT128, LONG_DOUBLE, };
 
 	private int arrayDimensions = 0;
 	private boolean isClass;
@@ -200,10 +200,10 @@ public class DemangledDataType extends DemangledType {
 			else if (dt == null) {
 
 				// I don't know what this is
-				// If it isn't pointed to, or isn't a referent, then assume typedef.
+				// If it isn't pointed to, or isn't a referent, then assume undefined typedef.
 				if (!(isReference() || isPointer())) { // Unknown type
 					dt = new TypedefDataType(getDemanglerCategoryPath(getNamespace()), name,
-						new DWordDataType());
+						DataType.DEFAULT);
 				}
 				else {
 					// try creating empty structures for unknown types instead.

Ghidra/Features/GnuDemangler/src/test/java/ghidra/app/util/demangler/gnu/GnuDemanglerTest.java

@@ -26,6 +26,7 @@ import generic.test.AbstractGenericTest;
 import ghidra.app.util.demangler.*;
 import ghidra.program.database.ProgramDB;
 import ghidra.program.model.address.Address;
+import ghidra.program.model.data.DataType;
 import ghidra.program.model.data.TerminatedStringDataType;
 import ghidra.program.model.listing.CodeUnit;
 import ghidra.program.model.listing.Data;
@@ -132,6 +133,60 @@ public class GnuDemanglerTest extends AbstractGenericTest {
 			fullSignature);
 	}
 
+	@Test
+	public void testUseStandardReplacements2() throws Exception {
+
+		// 
+		// Mangled: _ZN7Greeter5greetENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
+		//
+		// Demangled: undefined Greeter::greet(std::__cxx11::basic_string<char,std::char_traits<char>,std::allocator<char>>)
+		//
+		// Replaced: undefined Greeter::greet(std::string)
+		//
+		String mangled = "_ZN7Greeter5greetENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE";
+
+		GnuDemangler demangler = new GnuDemangler();
+		demangler.canDemangle(program);// this perform initialization
+
+		GnuDemanglerOptions options = new GnuDemanglerOptions();
+		options.setUseStandardReplacements(true);
+		DemangledFunction dobj = (DemangledFunction) demangler.demangle(mangled, options);
+		assertNotNull(dobj);
+
+		String signature = dobj.getSignature();
+		assertEquals("undefined Greeter::greet(std::string)", signature);
+
+		DemangledParameter demangledParameter = dobj.getParameters().get(0);
+		DemangledDataType type = demangledParameter.getType();
+		DataType dt = type.getDataType(program.getDataTypeManager());
+		assertTrue(dt.isNotYetDefined());
+		//@formatter:off
+		assertEquals("/Demangler/std/string\n" + 
+			"pack(disabled)\n" + 
+			"Structure string {\n" + 
+			"}\n" + 
+			"Length: 0 Alignment: 1\n", dt.toString());
+		//@formatter:on
+
+		//
+		// Now disable demangled string replacement
+		// 
+		options.setUseStandardReplacements(false);
+		dobj = (DemangledFunction) demangler.demangle(mangled, options);
+		assertNotNull(dobj);
+
+		String fullSignature = dobj.getSignature();
+		assertEquals(
+			"undefined Greeter::greet(std::__cxx11::basic_string<char,std::char_traits<char>,std::allocator<char>>)",
+			fullSignature);
+
+		demangledParameter = dobj.getParameters().get(0);
+		type = demangledParameter.getType();
+		dt = type.getDataType(program.getDataTypeManager());
+		assertEquals("typedef basic_string undefined", dt.toString());
+
+	}
+
 	@Test
 	public void testDemangleOnlyKnownPatterns_True() throws Exception {
 

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/ParamListStandard.java

@@ -4,9 +4,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -23,8 +23,7 @@ import java.util.ArrayList;
 
 import ghidra.program.model.address.Address;
 import ghidra.program.model.address.AddressSpace;
-import ghidra.program.model.data.DataType;
+import ghidra.program.model.data.*;
-import ghidra.program.model.data.DataTypeManager;
 import ghidra.program.model.lang.protorules.*;
 import ghidra.program.model.listing.Program;
 import ghidra.program.model.listing.VariableStorage;
@@ -133,6 +132,12 @@ public class ParamListStandard implements ParamList {
 		if (dt.isZeroLength()) {
 			return AssignAction.NO_ASSIGNMENT;
 		}
+		if (dt == DataType.DEFAULT) {
+			return AssignAction.NO_ASSIGNMENT;
+		}
+		if (dt instanceof TypeDef td && td.getBaseDataType() == DataType.DEFAULT) {
+			return AssignAction.NO_ASSIGNMENT;
+		}
 		for (ModelRule modelRule : modelRules) {
 			int responseCode = modelRule.assignAddress(dt, proto, pos, dtManager, status, res);
 			if (responseCode != AssignAction.FAIL) {