fix performance issues with implicit parameter coercion

dtool/src/interrogate/interfaceMakerPythonNative.cxx

@@ -2134,6 +2134,8 @@ write_function_forset(ostream &out, InterfaceMaker::Object *obj,
       << "PyObject *coerced = NULL;\n";
     indent(out,indent_level) 
       << "PyObject **coerced_ptr = NULL;\n";
+    indent(out,indent_level) 
+      << "bool report_errors = false;\n";
     indent(out,indent_level) 
       << "while (true) {\n";
     indent_level += 2;
@@ -2219,16 +2221,28 @@ write_function_forset(ostream &out, InterfaceMaker::Object *obj,
   if (coercion_possible) {
     // Try again, this time with coercion enabled.
     indent(out,indent_level) 
-      << "if (coerced_ptr != NULL) {\n";
+      << "if (coerced_ptr == NULL && !report_errors) {\n";
     indent(out,indent_level + 2) 
-      << "break;\n";
+      << "coerced_ptr = &coerced;\n";
+    indent(out,indent_level + 2) 
+      << "continue;\n";
     indent(out,indent_level) 
       << "}\n";
-    
+
+    // No dice.  Go back one more time, and this time get the error
+    // message.
     indent(out,indent_level) 
-      << "PyErr_Clear();\n";
+      << "if (!report_errors) {\n";
+    indent(out,indent_level + 2) 
+      << "report_errors = true;\n";
+    indent(out,indent_level + 2) 
+      << "continue;\n";
     indent(out,indent_level) 
-      << "coerced_ptr = &coerced;\n";
+      << "}\n";
+
+    // We've been through three times.  We're done.
+    indent(out,indent_level) 
+      << "break;\n";
     
     indent_level -= 2;
     indent(out,indent_level) 
@@ -2453,9 +2467,9 @@ write_function_instance(ostream &out, InterfaceMaker::Object *obj,
         if (coercion_possible && !is_copy_constructor) {
           // We never attempt to coerce a copy constructor parameter.
           // That would lead to infinite recursion.
-          str << ", coerced_ptr";
+          str << ", coerced_ptr, report_errors";
         } else {
-          str << ", NULL";
+          str << ", NULL, true";
         }
         str << ");\n";
 

dtool/src/interrogatedb/py_panda.cxx

@@ -94,10 +94,24 @@ attempt_coercion(PyObject *self, Dtool_PyTypedObject *classdef,
       // temporary object.  Weird.
       Py_DECREF(obj);
     }
+    
+    // Clear the error returned by the coercion constructor.  It's not
+    // the error message we want to report.
+    PyErr_Clear();
   }
   return NULL;
 }
 
+// Temporary function to preserve backward compatibility.
+void *
+DTOOL_Call_GetPointerThisClass(PyObject *self, Dtool_PyTypedObject *classdef,
+                               int param, const string &function_name, bool const_ok,
+                               PyObject **coerced) {
+  return DTOOL_Call_GetPointerThisClass(self, classdef,
+                                        param, function_name, const_ok,
+                                        coerced, true);
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: DTOOL_Call_GetPointerThisClass
 //  Description: Extracts the C++ pointer for an object, given its
@@ -140,7 +154,10 @@ attempt_coercion(PyObject *self, Dtool_PyTypedObject *classdef,
 void *
 DTOOL_Call_GetPointerThisClass(PyObject *self, Dtool_PyTypedObject *classdef,
                                int param, const string &function_name, bool const_ok,
-                               PyObject **coerced) {
+                               PyObject **coerced, bool report_errors) {
+  if (PyErr_Occurred()) {
+    return NULL;
+  }
   if (self != NULL) {
     if (DtoolCanThisBeAPandaInstance(self)) {
       Dtool_PyTypedObject *my_type = ((Dtool_PyInstDef *)self)->_My_Type;
@@ -150,16 +167,53 @@ DTOOL_Call_GetPointerThisClass(PyObject *self, Dtool_PyTypedObject *classdef,
           return result;
         }
 
-        ostringstream str;
-        str << function_name << "() argument " << param << " may not be const";
-        string msg = str.str();
-        PyErr_SetString(PyExc_TypeError, msg.c_str());
+        if (report_errors) {
+          ostringstream str;
+          str << function_name << "() argument " << param << " may not be const";
+          string msg = str.str();
+          PyErr_SetString(PyExc_TypeError, msg.c_str());
+        }
 
       } else {
-        ostringstream str;
-        str << function_name << "() argument " << param << " must be ";
+        if (report_errors) {
+          ostringstream str;
+          str << function_name << "() argument " << param << " must be ";
+          
+          
+          PyObject *fname = PyObject_GetAttrString((PyObject *)classdef, "__name__");
+          if (fname != (PyObject *)NULL) {
+            str << PyString_AsString(fname);
+            Py_DECREF(fname);
+          } else {
+            str << classdef->_name;
+          }
+          
+          PyObject *tname = PyObject_GetAttrString((PyObject *)self->ob_type, "__name__");
+          if (tname != (PyObject *)NULL) {
+            str << ", not " << PyString_AsString(tname);
+            Py_DECREF(tname);
+          } else {
+            str << ", not " << my_type->_name;
+          }
+          
+          string msg = str.str();
+          PyErr_SetString(PyExc_TypeError, msg.c_str());
+        }
+      }
 
+    } else {
+      // The parameter was not a Panda type.  Can we coerce it to the
+      // appropriate type, by creating a temporary object?
+      void *result = attempt_coercion(self, classdef, coerced);
+      if (result != NULL) {
+        return result;
+      }
 
+      // Coercion failed.
+      if (report_errors) {
+        ostringstream str;
+        str << function_name << "() argument " << param << " must be ";
+        
         PyObject *fname = PyObject_GetAttrString((PyObject *)classdef, "__name__");
         if (fname != (PyObject *)NULL) {
           str << PyString_AsString(fname);
@@ -167,50 +221,21 @@ DTOOL_Call_GetPointerThisClass(PyObject *self, Dtool_PyTypedObject *classdef,
         } else {
           str << classdef->_name;
         }
-
+        
         PyObject *tname = PyObject_GetAttrString((PyObject *)self->ob_type, "__name__");
         if (tname != (PyObject *)NULL) {
           str << ", not " << PyString_AsString(tname);
           Py_DECREF(tname);
-        } else {
-          str << ", not " << my_type->_name;
         }
-
+        
         string msg = str.str();
         PyErr_SetString(PyExc_TypeError, msg.c_str());
       }
-
-    } else {
-      // The parameter was not a Panda type.  Can we coerce it to the
-      // appropriate type, by creating a temporary object?
-      void *result = attempt_coercion(self, classdef, coerced);
-      if (result != NULL) {
-        return result;
-      }
-
-      // Coercion failed.
-      ostringstream str;
-      str << function_name << "() argument " << param << " must be ";
-
-      PyObject *fname = PyObject_GetAttrString((PyObject *)classdef, "__name__");
-      if (fname != (PyObject *)NULL) {
-        str << PyString_AsString(fname);
-        Py_DECREF(fname);
-      } else {
-        str << classdef->_name;
-      }
-
-      PyObject *tname = PyObject_GetAttrString((PyObject *)self->ob_type, "__name__");
-      if (tname != (PyObject *)NULL) {
-        str << ", not " << PyString_AsString(tname);
-        Py_DECREF(tname);
-      }
-
-      string msg = str.str();
-      PyErr_SetString(PyExc_TypeError, msg.c_str());
     }
   } else {
-    PyErr_SetString(PyExc_TypeError, "Self Is Null"); 
+    if (report_errors) {
+      PyErr_SetString(PyExc_TypeError, "Self Is Null"); 
+    }
   }
 
   return NULL;

dtool/src/interrogatedb/py_panda.h

@@ -364,6 +364,8 @@ EXPCL_DTOOLCONFIG bool DtoolCanThisBeAPandaInstance(PyObject *self);
 EXPCL_DTOOLCONFIG void DTOOL_Call_ExtractThisPointerForType(PyObject *self, Dtool_PyTypedObject * classdef, void ** answer);
 
 
+EXPCL_DTOOLCONFIG void * DTOOL_Call_GetPointerThisClass(PyObject *self, Dtool_PyTypedObject  *classdef, int param, const string &function_name, bool const_ok, PyObject **coerced, bool report_errors);
+
 EXPCL_DTOOLCONFIG void * DTOOL_Call_GetPointerThisClass(PyObject *self, Dtool_PyTypedObject  *classdef, int param, const string &function_name, bool const_ok, PyObject **coerced);
 
 EXPCL_DTOOLCONFIG void * DTOOL_Call_GetPointerThis(PyObject *self);