From 7349221f42c344291320aca9bd65b7abd44c4d25 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Fri, 22 Jun 2007 22:36:32 +0000
Subject: [PATCH] add get_python_pointer()

---
 panda/src/express/memoryUsagePointers.cxx | 71 +++++++++++++++++++++++
 panda/src/express/memoryUsagePointers.h   | 11 ++++
 2 files changed, 82 insertions(+)

diff --git a/panda/src/express/memoryUsagePointers.cxx b/panda/src/express/memoryUsagePointers.cxx
index a7e4eed5f5..72a39ce6f7 100644
--- a/panda/src/express/memoryUsagePointers.cxx
+++ b/panda/src/express/memoryUsagePointers.cxx
@@ -24,6 +24,18 @@
 #include "referenceCount.h"
 #include "typedReferenceCount.h"
 
+#ifdef HAVE_PYTHON
+// Pick up a few declarations so we can create Python wrappers in
+// get_python_pointer(), below.
+
+#include "py_panda.h"  
+
+extern EXPCL_PANDAEXPRESS Dtool_PyTypedObject Dtool_TypedObject;
+extern EXPCL_PANDAEXPRESS Dtool_PyTypedObject Dtool_TypedReferenceCount;
+extern EXPCL_PANDAEXPRESS Dtool_PyTypedObject Dtool_ReferenceCount;
+
+#endif  // HAVE_PYTHON
+
 ////////////////////////////////////////////////////////////////////
 //     Function: MemoryUsagePointers::Constructor
 //       Access: Published
@@ -141,6 +153,65 @@ get_age(int n) const {
   return _entries[n]._age;
 }
 
+#ifdef HAVE_PYTHON
+////////////////////////////////////////////////////////////////////
+//     Function: MemoryUsagePointers::get_python_pointer
+//       Access: Published
+//  Description: Returns the nth object, represented as a Python
+//               object of the appropriate type.  Reference counting
+//               will be properly set on the Python object.
+//
+//               get_typed_pointer() is almost as good as this, but
+//               (a) it does not set the reference count, and (b) it
+//               does not work for objects that do not inherit from
+//               TypedObject.  This will work for any object whose
+//               type is known, which has a Python representation.
+////////////////////////////////////////////////////////////////////
+PyObject *MemoryUsagePointers::
+get_python_pointer(int n) const {
+  nassertr(n >= 0 && n < get_num_pointers(), NULL);
+  TypedObject *typed_ptr = _entries[n]._typed_ptr;
+  ReferenceCount *ref_ptr = _entries[n]._ref_ptr;
+
+  bool memory_rules = false;
+  if (ref_ptr != (ReferenceCount *)NULL) {
+    memory_rules = true;
+    ref_ptr->ref();
+  }
+
+  if (typed_ptr != (TypedObject *)NULL) {
+    return DTool_CreatePyInstanceTyped(typed_ptr, Dtool_TypedObject,
+                                       memory_rules, false, 
+                                       typed_ptr->get_type_index());
+  }
+
+  if (ref_ptr == (ReferenceCount *)NULL) {
+    return Py_BuildValue("");
+  }
+
+  TypeHandle type = _entries[n]._type;
+  if (type != TypeHandle::none()) {
+    // Use TypedReferenceCount if we have it.
+    if (type.is_derived_from(TypedReferenceCount::get_class_type())) {
+      TypedReferenceCount *typed_ref_ptr = (TypedReferenceCount *)ref_ptr;
+      
+      return DTool_CreatePyInstanceTyped(typed_ref_ptr, Dtool_TypedReferenceCount,
+                                         memory_rules, false, 
+                                         type.get_index());
+    }
+
+    // Otherwise, trust that there is a downcast path to the actual type.
+    return DTool_CreatePyInstanceTyped(ref_ptr, Dtool_ReferenceCount,
+                                       memory_rules, false, 
+                                       type.get_index());
+  }
+
+  // If worse comes to worst, just return a ReferenceCount wrapper.
+  return DTool_CreatePyInstance(ref_ptr, Dtool_ReferenceCount, 
+                                memory_rules, false);
+}
+#endif
+
 ////////////////////////////////////////////////////////////////////
 //     Function: MemoryUsagePointers::clear
 //       Access: Published
diff --git a/panda/src/express/memoryUsagePointers.h b/panda/src/express/memoryUsagePointers.h
index 277416f85e..1ab696c1a5 100644
--- a/panda/src/express/memoryUsagePointers.h
+++ b/panda/src/express/memoryUsagePointers.h
@@ -28,6 +28,13 @@
 #include "referenceCount.h"
 #include "pvector.h"
 
+#ifdef HAVE_PYTHON
+
+#undef _POSIX_C_SOURCE
+#include <Python.h>
+
+#endif  // HAVE_PYTHON
+
 ////////////////////////////////////////////////////////////////////
 //       Class : MemoryUsagePointers
 // Description : This is a list of pointers returned by a MemoryUsage
@@ -61,6 +68,10 @@ PUBLISHED:
   string get_type_name(int n) const;
   double get_age(int n) const;
 
+#ifdef HAVE_PYTHON
+  PyObject *get_python_pointer(int n) const;
+#endif
+
   void clear();
 
   void output(ostream &out) const;