Fixed a crash caused by deleting forward declarations other declarations might depend on.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Core/Parser/ASTConverter.cs

@@ -835,7 +835,8 @@ namespace CppSharp
             {
                 var decl = ctx.getClasses(i);
                 var _decl = Visit(decl) as AST.Class;
-                _ctx.Classes.Add(_decl);
+                if (!_decl.IsIncomplete)
+                    _ctx.Classes.Add(_decl);
             }
 
             for (uint i = 0; i < ctx.TemplatesCount; ++i)

src/CppParser/AST.cpp

@@ -258,7 +258,7 @@ Namespace* DeclarationContext::FindCreateNamespace(const std::string& Name)
     return _namespace;
 }
 
-Class* DeclarationContext::FindClass(const std::string& Name)
+Class* DeclarationContext::FindClass(const std::string& Name, bool IsComplete)
 {
     if (Name.empty()) return nullptr;
 
@@ -267,7 +267,8 @@ Class* DeclarationContext::FindClass(const std::string& Name)
     if (entries.size() == 1)
     {
         auto _class = std::find_if(Classes.begin(), Classes.end(),
-            [&](Class* klass) { return klass->Name == Name; });
+            [&](Class* klass) { return klass->Name == Name &&
+                (!klass->IsIncomplete || !IsComplete); });
 
         return _class != Classes.end() ? *_class : nullptr;
     }
@@ -281,7 +282,7 @@ Class* DeclarationContext::FindClass(const std::string& Name)
     if (!_namespace)
         return nullptr;
 
-    return _namespace->FindClass(className);
+    return _namespace->FindClass(className, IsComplete);
 }
 
 Class* DeclarationContext::CreateClass(std::string Name, bool IsComplete)
@@ -297,7 +298,7 @@ Class* DeclarationContext::CreateClass(std::string Name, bool IsComplete)
 Class* DeclarationContext::FindClass(const std::string& Name, bool IsComplete,
         bool Create)
 {
-    auto _class = FindClass(Name);
+    auto _class = FindClass(Name, IsComplete);
 
     if (!_class)
     {
@@ -310,31 +311,7 @@ Class* DeclarationContext::FindClass(const std::string& Name, bool IsComplete,
         return _class;
     }
 
-    if (!_class->IsIncomplete || !IsComplete)
-        return _class;
-
-    if (!Create)
-        return nullptr;
-
-    auto newClass = CreateClass(Name, IsComplete);
-
-    // Replace the incomplete declaration with the complete one.
-    if (_class->IsIncomplete)
-    {
-        bool Found = false;
-        std::replace_if(Classes.begin(), Classes.end(),
-            [&](Class* klass)
-            {
-                Found |= (klass == _class);
-                return klass == _class;
-            }, newClass);
-        if (Found)
-            delete _class;
-        else
-            _class->CompleteDeclaration = newClass;
-    }
-
-    return newClass;
+    return _class;
 }
 
 Enumeration* DeclarationContext::FindEnum(void* OriginalPtr)

src/CppParser/AST.h

@@ -433,9 +433,9 @@ public:
     CS_IGNORE CppSharp::CppParser::AST::Namespace* FindCreateNamespace(const std::string& Name);
 
     CS_IGNORE Class* CreateClass(std::string Name, bool IsComplete);
-    CS_IGNORE Class* FindClass(const std::string& Name);
+    CS_IGNORE Class* FindClass(const std::string& Name, bool IsComplete);
     CS_IGNORE Class* FindClass(const std::string& Name, bool IsComplete,
-        bool Create = false);
+        bool Create);
 
     CS_IGNORE ClassTemplate* FindClassTemplate(const std::string& USR);
     CS_IGNORE FunctionTemplate* FindFunctionTemplate(const std::string& USR);

tests/Common/Common.h

@@ -1002,3 +1002,18 @@ void NonTrivialDtor::setDtorCalled(bool value)
 {
     dtorCalled = true;
 }
+
+template <class T> class ForwardedTemplate;
+
+ForwardedTemplate<int> returnsForwardedTemplate();
+
+template <class T> class ForwardedTemplate
+{
+    ForwardedTemplate<T> functionInForwardedTemplate() const;
+};
+
+template <class T>
+ForwardedTemplate<T> ForwardedTemplate<T>::functionInForwardedTemplate() const
+{
+    return ForwardedTemplate<T>();
+}