Fix C code where a typedef name was used for constructor and destructor names in %extend. Deprecate use of typedef names for constructor and destructor names going forwards.

Doc/Manual/Warnings.html

@@ -527,6 +527,8 @@ example.i(4) : Syntax error in input.
 <li>519. %template() contains no name. Template method ignored: <em>declaration</em>
 <li>520. <em>Base/Derived</em> class '<em>classname1</em>' of '<em>classname2</em>' is not similarly marked as a smart pointer.
 <li>521. Illegal destructor name <em>name</em>. Ignored.
+<li>522. Use of an illegal constructor name '<em>name</em>' in %extend is deprecated, the constructor name should be '<em>name</em>'.
+<li>523. Use of an illegal destructor name '<em>name</em>' in %extend is deprecated, the destructor name should be '<em>name</em>'.
 </ul>
 
 <H3><a name="Warnings_nn15"></a>14.9.6 Language module specific (700-899) </H3>

Examples/test-suite/errors/expected.log

@@ -190,7 +190,13 @@ swig_apply_nargs.i:6: Error: Can't apply (char *str,int len) to (int x).  Number
 
 :::::::::::::::::::::::::::::::: swig_extend.i :::::::::::::::::::::::::::::::::::
 swig_extend.i:19: Warning 326: Deprecated %extend name used - the struct name 'StructBName' should be used instead of the typedef name 'StructB'.
+swig_extend.i:45: Warning 326: Deprecated %extend name used - the struct name 'stru_struct' should be used instead of the typedef name 'stru'.
+swig_extend.i:56: Warning 326: Deprecated %extend name used - the union name 'uni_union' should be used instead of the typedef name 'uni'.
 swig_extend.i:34: Warning 303: %extend defined for an undeclared class StructDName.
+swig_extend.i:50: Warning 522: Use of an illegal constructor name 'stru' in %extend is deprecated, the constructor name should be 'stru_struct'.
+swig_extend.i:53: Warning 523: Use of an illegal destructor name 'stru' in %extend is deprecated, the destructor name should be 'stru_struct'.
+swig_extend.i:57: Warning 522: Use of an illegal constructor name 'uni' in %extend is deprecated, the constructor name should be 'uni_union'.
+swig_extend.i:58: Warning 523: Use of an illegal destructor name 'uni' in %extend is deprecated, the destructor name should be 'uni_union'.
 
 :::::::::::::::::::::::::::::::: swig_identifier.i :::::::::::::::::::::::::::::::::::
 swig_identifier.i:5: Warning 503: Can't wrap 'foo bar' unless renamed to a valid identifier.

Examples/test-suite/errors/swig_extend.i

@@ -33,3 +33,28 @@ typedef struct StructD StructDName;
   void method() {}
 }
 
+
+typedef struct stru_struct {
+    int bar;
+} stru;
+typedef union uni_union {
+    int un1;
+    double un2;
+} uni;
+
+%extend stru {
+    stru() {
+        stru* s = (stru*)malloc(sizeof(stru));
+        s->bar = 11;
+        return s;
+    }
+    ~stru() {
+      free($self);
+    }
+}
+
+%extend uni {
+  uni() { return 0; }
+  ~uni() { free($self); }
+}
+

Examples/test-suite/extend_constructor_destructor.i

@@ -2,6 +2,10 @@
 
 %warnfilter(SWIGWARN_PARSE_EXTEND_NAME) Space::tagCStruct;
 %warnfilter(SWIGWARN_PARSE_EXTEND_NAME) tagEStruct;
+%warnfilter(SWIGWARN_LANG_EXTEND_CONSTRUCTOR) Space::tagCStruct::CStruct;
+%warnfilter(SWIGWARN_LANG_EXTEND_DESTRUCTOR) Space::tagCStruct::~CStruct;
+%warnfilter(SWIGWARN_LANG_EXTEND_CONSTRUCTOR) tagEStruct::EStruct;
+%warnfilter(SWIGWARN_LANG_EXTEND_DESTRUCTOR) tagEStruct::~EStruct;
 
 %inline %{
 int globalVar = 0;

Source/Include/swigwarn.h

@@ -197,6 +197,8 @@
 #define WARN_LANG_TEMPLATE_METHOD_IGNORE 519
 #define WARN_LANG_SMARTPTR_MISSING    520
 #define WARN_LANG_ILLEGAL_DESTRUCTOR  521
+#define WARN_LANG_EXTEND_CONSTRUCTOR  522
+#define WARN_LANG_EXTEND_DESTRUCTOR   523
 
 /* -- Reserved (600-799) -- */
 

Source/Modules/lang.cxx

@@ -2631,10 +2631,22 @@ int Language::constructorDeclaration(Node *n) {
       if (!Equal(actual_name, expected_name) && !(Getattr(n, "template"))) {
 	bool illegal_name = true;
 	if (Extend) {
-	  // SWIG extension - allow typedef names as destructor name in %extend - an unnamed struct declared with a typedef can thus be given a 'destructor'.
+	  // Check for typedef names used as a constructor name in %extend. This is deprecated except for anonymous
+	  // typedef structs which have had their symbol names adjusted to the typedef name in the parser.
 	  SwigType *name_resolved = SwigType_typedef_resolve_all(actual_name);
 	  SwigType *expected_name_resolved = SwigType_typedef_resolve_all(expected_name);
+
+	  if (!CPlusPlus) {
+	    if (Strncmp(name_resolved, "struct ", 7) == 0)
+	      Replace(name_resolved, "struct ", "", DOH_REPLACE_FIRST);
+	    else if (Strncmp(name_resolved, "union ", 6) == 0)
+	      Replace(name_resolved, "union ", "", DOH_REPLACE_FIRST);
+	  }
+
 	  illegal_name = !Equal(name_resolved, expected_name_resolved);
+	  if (!illegal_name)
+	    Swig_warning(WARN_LANG_EXTEND_CONSTRUCTOR, input_file, line_number, "Use of an illegal constructor name '%s' in %%extend is deprecated, the constructor name should be '%s'.\n", 
+		SwigType_str(Swig_scopename_last(actual_name), 0), SwigType_str(Swig_scopename_last(expected_name), 0));
 	  Delete(name_resolved);
 	  Delete(expected_name_resolved);
 	}
@@ -2770,10 +2782,22 @@ int Language::destructorDeclaration(Node *n) {
   if (!Equal(actual_name, expected_name) && !(Getattr(n, "template"))) {
     bool illegal_name = true;
     if (Extend) {
-      // SWIG extension - allow typedef names as destructor name in %extend - an unnamed struct declared with a typedef can thus be given a 'destructor'.
+      // Check for typedef names used as a destructor name in %extend. This is deprecated except for anonymous
+      // typedef structs which have had their symbol names adjusted to the typedef name in the parser.
       SwigType *name_resolved = SwigType_typedef_resolve_all(actual_name);
       SwigType *expected_name_resolved = SwigType_typedef_resolve_all(expected_name);
+
+      if (!CPlusPlus) {
+	if (Strncmp(name_resolved, "struct ", 7) == 0)
+	  Replace(name_resolved, "struct ", "", DOH_REPLACE_FIRST);
+	else if (Strncmp(name_resolved, "union ", 6) == 0)
+	  Replace(name_resolved, "union ", "", DOH_REPLACE_FIRST);
+      }
+
       illegal_name = !Equal(name_resolved, expected_name_resolved);
+      if (!illegal_name)
+	Swig_warning(WARN_LANG_EXTEND_DESTRUCTOR, input_file, line_number, "Use of an illegal destructor name '%s' in %%extend is deprecated, the destructor name should be '%s'.\n", 
+	    SwigType_str(Swig_scopename_last(actual_name), 0), SwigType_str(Swig_scopename_last(expected_name), 0));
       Delete(name_resolved);
       Delete(expected_name_resolved);
     }