bpy rna

Calling rna functions with invalid keywords, too many keywords and too many args would fail silently
- now raise an error with invalid keywords and a list of valid ones, raise an error when too many args are given.
- calling rna functions would alloc a ParameterList each time, changed to use a stack variable (2 pointers and an int).
- store the number of parameters ParameterList
- python exception types were wrong in many cases, (using attribute error rather then type error)
- fixes to small errors in python UI scripts.

7 files changed, 180 insertions, 97 deletions

diff --git a/source/blender/editors/space_console/space_console.c b/source/blender/editors/space_console/space_console.c
index f5bccbce3f5..4585eef2579 100644
--- a/source/blender/editors/space_console/space_console.c
+++ b/source/blender/editors/space_console/space_console.c
@@ -60,7 +60,7 @@
 
 #include "console_intern.h"	// own include
 
-static void console_update_rect(bContext *C, ARegion *ar)
+static void console_update_rect(const bContext *C, ARegion *ar)
 {
 	SpaceConsole *sc= CTX_wm_space_console(C);
 	View2D *v2d= &ar->v2d;
diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index a04a09d4d11..9ad71f4e1d7 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -758,8 +758,9 @@ const struct ListBase *RNA_function_defined_parameters(FunctionRNA *func);
 
 /* Utility */
 
-ParameterList *RNA_parameter_list_create(PointerRNA *ptr, FunctionRNA *func);
+ParameterList *RNA_parameter_list_create(ParameterList *parms, PointerRNA *ptr, FunctionRNA *func);
 void RNA_parameter_list_free(ParameterList *parms);
+int  RNA_parameter_list_size(ParameterList *parms);
 
 void RNA_parameter_list_begin(ParameterList *parms, ParameterIterator *iter);
 void RNA_parameter_list_next(ParameterIterator *iter);
diff --git a/source/blender/makesrna/RNA_types.h b/source/blender/makesrna/RNA_types.h
index dc2a2a1a1de..bf4fa97b6fe 100644
--- a/source/blender/makesrna/RNA_types.h
+++ b/source/blender/makesrna/RNA_types.h
@@ -163,10 +163,19 @@ typedef struct PropertyRNA PropertyRNA;
 
 /* Parameter List */
 
-typedef struct ParameterList ParameterList;
+typedef struct ParameterList {
+	/* storage for parameters */
+	void *data;
+
+	/* store the parameter count */
+	int tot;
+
+	/* function passed at creation time */
+	struct FunctionRNA *func;
+} ParameterList;
 
 typedef struct ParameterIterator {
-	ParameterList *parms;
+	struct ParameterList *parms;
 	PointerRNA funcptr;
 	void *data;
 	int size, offset;
@@ -209,7 +218,7 @@ typedef enum StructFlag {
 } StructFlag;
 
 typedef int (*StructValidateFunc)(struct PointerRNA *ptr, void *data, int *have_function);
-typedef int (*StructCallbackFunc)(struct PointerRNA *ptr, struct FunctionRNA *func, struct ParameterList *list);
+typedef int (*StructCallbackFunc)(struct PointerRNA *ptr, struct FunctionRNA *func, ParameterList *list);
 typedef void (*StructFreeFunc)(void *data);
 typedef struct StructRNA *(*StructRegisterFunc)(const struct bContext *C, struct ReportList *reports, void *data,
 	StructValidateFunc validate, StructCallbackFunc call, StructFreeFunc free);
diff --git a/source/blender/makesrna/intern/rna_access.c b/source/blender/makesrna/intern/rna_access.c
index 838592562b3..b55df31640f 100644
--- a/source/blender/makesrna/intern/rna_access.c
+++ b/source/blender/makesrna/intern/rna_access.c
@@ -1404,9 +1404,10 @@ void RNA_property_collection_add(PointerRNA *ptr, PropertyRNA *prop, PointerRNA
 #if 0
 	else if(cprop->add){
 		if(!(cprop->add->flag & FUNC_USE_CONTEXT)) { /* XXX check for this somewhere else */
-			ParameterList *params= RNA_parameter_list_create(ptr, cprop->add);
-			RNA_function_call(NULL, NULL, ptr, cprop->add, params);
-			RNA_parameter_list_free(params);
+			ParameterList params;
+			RNA_parameter_list_create(&params, ptr, cprop->add);
+			RNA_function_call(NULL, NULL, ptr, cprop->add, &params);
+			RNA_parameter_list_free(&params);
 		}
 	}
 #endif
@@ -1453,9 +1454,10 @@ void RNA_property_collection_remove(PointerRNA *ptr, PropertyRNA *prop, int key)
 #if 0
 	else if(cprop->remove){
 		if(!(cprop->remove->flag & FUNC_USE_CONTEXT)) { /* XXX check for this somewhere else */
-			ParameterList *params= RNA_parameter_list_create(ptr, cprop->remove);
-			RNA_function_call(NULL, NULL, ptr, cprop->remove, params);
-			RNA_parameter_list_free(params);
+			ParameterList params;
+			RNA_parameter_list_create(&ptr, cprop->remove);
+			RNA_function_call(NULL, NULL, ptr, cprop->remove, &params);
+			RNA_parameter_list_free(&params);
 		}
 	}
 #endif
@@ -2787,20 +2789,17 @@ const struct ListBase *RNA_function_defined_parameters(FunctionRNA *func)
 
 /* Utility */
 
-ParameterList *RNA_parameter_list_create(PointerRNA *ptr, FunctionRNA *func)
+ParameterList *RNA_parameter_list_create(ParameterList *parms, PointerRNA *ptr, FunctionRNA *func)
 {
-	ParameterList *parms;
 	PropertyRNA *parm;
-	int tot;
-
-	parms= MEM_callocN(sizeof(ParameterList), "ParameterList");
+	int tot= 0;
 
-	parm= func->cont.properties.first;
-	for(tot= 0; parm; parm= parm->next)
+	for(parm= func->cont.properties.first; parm; parm= parm->next)
 		tot+= rna_parameter_size(parm);
 
 	parms->data= MEM_callocN(tot, "RNA_parameter_list_create");
 	parms->func= func;
+	parms->tot= tot;
 
 	return parms;
 }
@@ -2822,8 +2821,11 @@ void RNA_parameter_list_free(ParameterList *parms)
 	parms->data= NULL;
 
 	parms->func= NULL;
+}
 
-	MEM_freeN(parms);
+int  RNA_parameter_list_size(ParameterList *parms)
+{
+	return parms->tot;
 }
 
 void RNA_parameter_list_begin(ParameterList *parms, ParameterIterator *iter)
@@ -3141,7 +3143,7 @@ static int rna_function_parameter_parse(PointerRNA *ptr, PropertyRNA *prop, Prop
 int RNA_function_call_direct_va(bContext *C, ReportList *reports, PointerRNA *ptr, FunctionRNA *func, const char *format, va_list args)
 {
 	PointerRNA funcptr;
-	ParameterList *parms;
+	ParameterList parms;
 	ParameterIterator iter;
 	PropertyRNA *pret, *parm;
 	PropertyType type;
@@ -3157,8 +3159,8 @@ int RNA_function_call_direct_va(bContext *C, ReportList *reports, PointerRNA *pt
 	pret= RNA_function_return(func);
 	flen= strlen(format);
 
-	parms= RNA_parameter_list_create(ptr, func);
-	RNA_parameter_list_begin(parms, &iter);
+	RNA_parameter_list_create(&parms, ptr, func);
+	RNA_parameter_list_begin(&parms, &iter);
 
 	for(i= 0, ofs= 0; iter.valid; RNA_parameter_list_next(&iter), i++) {
 		parm= iter.parm;
@@ -3240,7 +3242,7 @@ int RNA_function_call_direct_va(bContext *C, ReportList *reports, PointerRNA *pt
 	}
 
 	if (err==0)
-		err= RNA_function_call(C, reports, ptr, func, parms);
+		err= RNA_function_call(C, reports, ptr, func, &parms);
 
 	/* XXX throw error when more parameters than those needed are passed or leave silent? */
 	if (err==0 && pret && ofs<flen && format[ofs++]=='R') {
@@ -3302,7 +3304,7 @@ int RNA_function_call_direct_va(bContext *C, ReportList *reports, PointerRNA *pt
 	}
 
 	RNA_parameter_list_end(&iter);
-	RNA_parameter_list_free(parms);
+	RNA_parameter_list_free(&parms);
 
 	return err;
 }
diff --git a/source/blender/makesrna/intern/rna_internal_types.h b/source/blender/makesrna/intern/rna_internal_types.h
index b63e347e165..12bd876ce52 100644
--- a/source/blender/makesrna/intern/rna_internal_types.h
+++ b/source/blender/makesrna/intern/rna_internal_types.h
@@ -88,14 +88,6 @@ typedef struct ContainerRNA {
 	ListBase properties;
 } ContainerRNA;
 
-struct ParameterList {
-	/* storage for parameters */
-	void *data;
-
-	/* function passed at creation time */
-	FunctionRNA *func;
-};
-
 struct FunctionRNA {
 	/* structs are containers of properties */
 	ContainerRNA cont;
diff --git a/source/blender/makesrna/intern/rna_ui.c b/source/blender/makesrna/intern/rna_ui.c
index b10ca6c5e83..217f1ea00a8 100644
--- a/source/blender/makesrna/intern/rna_ui.c
+++ b/source/blender/makesrna/intern/rna_ui.c
@@ -76,7 +76,7 @@ static ARegionType *region_type_find(ReportList *reports, int space_type, int re
 static int panel_poll(const bContext *C, PanelType *pt)
 {
 	PointerRNA ptr;
-	ParameterList *list;
+	ParameterList list;
 	FunctionRNA *func;
 	void *ret;
 	int visible;
@@ -84,14 +84,14 @@ static int panel_poll(const bContext *C, PanelType *pt)
 	RNA_pointer_create(NULL, pt->py_srna, NULL, &ptr); /* dummy */
 	func= RNA_struct_find_function(&ptr, "poll");
 
-	list= RNA_parameter_list_create(&ptr, func);
-	RNA_parameter_set_lookup(list, "context", &C);
-	pt->py_call(&ptr, func, list);
+	RNA_parameter_list_create(&list, &ptr, func);
+	RNA_parameter_set_lookup(&list, "context", &C);
+	pt->py_call(&ptr, func, &list);
 
-	RNA_parameter_get_lookup(list, "visible", &ret);
+	RNA_parameter_get_lookup(&list, "visible", &ret);
 	visible= *(int*)ret;
 
-	RNA_parameter_list_free(list);
+	RNA_parameter_list_free(&list);
 
 	return visible;
 }
@@ -99,33 +99,33 @@ static int panel_poll(const bContext *C, PanelType *pt)
 static void panel_draw(const bContext *C, Panel *pnl)
 {
 	PointerRNA ptr;
-	ParameterList *list;
+	ParameterList list;
 	FunctionRNA *func;
 
 	RNA_pointer_create(&CTX_wm_screen(C)->id, pnl->type->py_srna, pnl, &ptr);
 	func= RNA_struct_find_function(&ptr, "draw");
 
-	list= RNA_parameter_list_create(&ptr, func);
-	RNA_parameter_set_lookup(list, "context", &C);
-	pnl->type->py_call(&ptr, func, list);
+	RNA_parameter_list_create(&list, &ptr, func);
+	RNA_parameter_set_lookup(&list, "context", &C);
+	pnl->type->py_call(&ptr, func, &list);
 
-	RNA_parameter_list_free(list);
+	RNA_parameter_list_free(&list);
 }
 
 static void panel_draw_header(const bContext *C, Panel *pnl)
 {
 	PointerRNA ptr;
-	ParameterList *list;
+	ParameterList list;
 	FunctionRNA *func;
 
 	RNA_pointer_create(&CTX_wm_screen(C)->id, pnl->type->py_srna, pnl, &ptr);
 	func= RNA_struct_find_function(&ptr, "draw_header");
 
-	list= RNA_parameter_list_create(&ptr, func);
-	RNA_parameter_set_lookup(list, "context", &C);
-	pnl->type->py_call(&ptr, func, list);
+	RNA_parameter_list_create(&list, &ptr, func);
+	RNA_parameter_set_lookup(&list, "context", &C);
+	pnl->type->py_call(&ptr, func, &list);
 
-	RNA_parameter_list_free(list);
+	RNA_parameter_list_free(&list);
 }
 
 static void rna_Panel_unregister(const bContext *C, StructRNA *type)
@@ -210,17 +210,17 @@ static StructRNA* rna_Panel_refine(struct PointerRNA *ptr)
 static void header_draw(const bContext *C, Header *hdr)
 {
 	PointerRNA htr;
-	ParameterList *list;
+	ParameterList list;
 	FunctionRNA *func;
 
 	RNA_pointer_create(&CTX_wm_screen(C)->id, hdr->type->py_srna, hdr, &htr);
 	func= RNA_struct_find_function(&htr, "draw");
 
-	list= RNA_parameter_list_create(&htr, func);
-	RNA_parameter_set_lookup(list, "context", &C);
-	hdr->type->py_call(&htr, func, list);
+	RNA_parameter_list_create(&list, &htr, func);
+	RNA_parameter_set_lookup(&list, "context", &C);
+	hdr->type->py_call(&htr, func, &list);
 
-	RNA_parameter_list_free(list);
+	RNA_parameter_list_free(&list);
 }
 
 static void rna_Header_unregister(const bContext *C, StructRNA *type)
@@ -301,7 +301,7 @@ static StructRNA* rna_Header_refine(struct PointerRNA *htr)
 static int menu_poll(const bContext *C, MenuType *pt)
 {
 	PointerRNA ptr;
-	ParameterList *list;
+	ParameterList list;
 	FunctionRNA *func;
 	void *ret;
 	int visible;
@@ -309,14 +309,14 @@ static int menu_poll(const bContext *C, MenuType *pt)
 	RNA_pointer_create(NULL, pt->py_srna, NULL, &ptr); /* dummy */
 	func= RNA_struct_find_function(&ptr, "poll");
 
-	list= RNA_parameter_list_create(&ptr, func);
-	RNA_parameter_set_lookup(list, "context", &C);
-	pt->py_call(&ptr, func, list);
+	RNA_parameter_list_create(&list, &ptr, func);
+	RNA_parameter_set_lookup(&list, "context", &C);
+	pt->py_call(&ptr, func, &list);
 
-	RNA_parameter_get_lookup(list, "visible", &ret);
+	RNA_parameter_get_lookup(&list, "visible", &ret);
 	visible= *(int*)ret;
 
-	RNA_parameter_list_free(list);
+	RNA_parameter_list_free(&list);
 
 	return visible;
 }
@@ -324,17 +324,17 @@ static int menu_poll(const bContext *C, MenuType *pt)
 static void menu_draw(const bContext *C, Menu *hdr)
 {
 	PointerRNA mtr;
-	ParameterList *list;
+	ParameterList list;
 	FunctionRNA *func;
 
 	RNA_pointer_create(&CTX_wm_screen(C)->id, hdr->type->py_srna, hdr, &mtr);
 	func= RNA_struct_find_function(&mtr, "draw");
 
-	list= RNA_parameter_list_create(&mtr, func);
-	RNA_parameter_set_lookup(list, "context", &C);
-	hdr->type->py_call(&mtr, func, list);
+	RNA_parameter_list_create(&list, &mtr, func);
+	RNA_parameter_set_lookup(&list, "context", &C);
+	hdr->type->py_call(&mtr, func, &list);
 
-	RNA_parameter_list_free(list);
+	RNA_parameter_list_free(&list);
 }
 
 static void rna_Menu_unregister(const bContext *C, StructRNA *type)
diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
index 9ce9ec8e838..34269db7f94 100644
--- a/source/blender/python/intern/bpy_rna.c
+++ b/source/blender/python/intern/bpy_rna.c
@@ -367,7 +367,7 @@ PyObject * pyrna_prop_to_py(PointerRNA *ptr, PropertyRNA *prop)
 		ret = pyrna_prop_CreatePyObject(ptr, prop);
 		break;
 	default:
-		PyErr_Format(PyExc_AttributeError, "RNA Error: unknown type \"%d\" (pyrna_prop_to_py)", type);
+		PyErr_Format(PyExc_TypeError, "RNA Error: unknown type \"%d\" (pyrna_prop_to_py)", type);
 		ret = NULL;
 		break;
 	}
@@ -392,7 +392,7 @@ int pyrna_pydict_to_props(PointerRNA *ptr, PyObject *kw, const char *error_prefi
 		if (strcmp(arg_name, "rna_type")==0) continue;
 
 		if (kw==NULL) {
-			PyErr_Format( PyExc_AttributeError, "%.200s: no keywords, expected \"%.200s\"", error_prefix, arg_name ? arg_name : "<UNKNOWN>");
+			PyErr_Format( PyExc_TypeError, "%.200s: no keywords, expected \"%.200s\"", error_prefix, arg_name ? arg_name : "<UNKNOWN>");
 			error_val= -1;
 			break;
 		}
@@ -400,7 +400,7 @@ int pyrna_pydict_to_props(PointerRNA *ptr, PyObject *kw, const char *error_prefi
 		item= PyDict_GetItemString(kw, arg_name);
 
 		if (item == NULL) {
-			PyErr_Format( PyExc_AttributeError, "%.200s: keyword \"%.200s\" missing", error_prefix, arg_name ? arg_name : "<UNKNOWN>");
+			PyErr_Format( PyExc_TypeError, "%.200s: keyword \"%.200s\" missing", error_prefix, arg_name ? arg_name : "<UNKNOWN>");
 			error_val = -1; /* pyrna_py_to_prop sets the error */
 			break;
 		}
@@ -424,7 +424,7 @@ int pyrna_pydict_to_props(PointerRNA *ptr, PyObject *kw, const char *error_prefi
 			arg_name= NULL;
 		}
 
-		PyErr_Format( PyExc_AttributeError, "%.200s: keyword \"%.200s\" unrecognized", error_prefix, arg_name ? arg_name : "<UNKNOWN>");
+		PyErr_Format( PyExc_TypeError, "%.200s: keyword \"%.200s\" unrecognized", error_prefix, arg_name ? arg_name : "<UNKNOWN>");
 		error_val = -1;
 	}
 
@@ -482,7 +482,7 @@ int pyrna_py_to_prop(PointerRNA *ptr, PropertyRNA *prop, void *data, PyObject *v
 		/* done getting the length */
 		
 		if (py_len != len) {
-			PyErr_Format(PyExc_AttributeError, "python sequence length %d did not match the RNA array length %d.", py_len, len);
+			PyErr_Format(PyExc_TypeError, "python sequence length %d did not match the RNA array length %d.", py_len, len);
 			return -1;
 		}
 		
@@ -647,7 +647,7 @@ int pyrna_py_to_prop(PointerRNA *ptr, PropertyRNA *prop, void *data, PyObject *v
 					else		RNA_property_enum_set(ptr, prop, val);
 				} else {
 					char *enum_str= pyrna_enum_as_string(ptr, prop);
-					PyErr_Format(PyExc_AttributeError, "enum \"%.200s\" not found in (%.200s)", param, enum_str);
+					PyErr_Format(PyExc_TypeError, "enum \"%.200s\" not found in (%.200s)", param, enum_str);
 					MEM_freeN(enum_str);
 					return -1;
 				}
@@ -1807,7 +1807,7 @@ PyObject *pyrna_param_to_py(PointerRNA *ptr, PropertyRNA *prop, void *data)
 				PyTuple_SET_ITEM(ret, a, PyFloat_FromDouble( ((float*)data)[a] ));
 			break;
 		default:
-			PyErr_Format(PyExc_AttributeError, "RNA Error: unknown array type \"%d\" (pyrna_param_to_py)", type);
+			PyErr_Format(PyExc_TypeError, "RNA Error: unknown array type \"%d\" (pyrna_param_to_py)", type);
 			ret = NULL;
 			break;
 		}
@@ -1889,7 +1889,7 @@ PyObject *pyrna_param_to_py(PointerRNA *ptr, PropertyRNA *prop, void *data)
 			break;
 		}
 		default:
-			PyErr_Format(PyExc_AttributeError, "RNA Error: unknown type \"%d\" (pyrna_param_to_py)", type);
+			PyErr_Format(PyExc_TypeError, "RNA Error: unknown type \"%d\" (pyrna_param_to_py)", type);
 			ret = NULL;
 			break;
 		}
@@ -1904,25 +1904,31 @@ static PyObject * pyrna_func_call(PyObject * self, PyObject *args, PyObject *kw)
 	FunctionRNA *self_func=  PyCObject_AsVoidPtr(PyTuple_GET_ITEM(self, 1));
 
 	PointerRNA funcptr;
-	ParameterList *parms;
+	ParameterList parms;
 	ParameterIterator iter;
 	PropertyRNA *pret, *parm;
 	PyObject *ret, *item;
-	int i, tlen, flag, err= 0;
-	const char *tid, *fid, *pid;
+	int i, args_len, parms_len, flag, err= 0, kw_tot= 0;
+	const char *parm_id;
 	void *retdata= NULL;
 
 	/* setup */
 	RNA_pointer_create(NULL, &RNA_Function, self_func, &funcptr);
 
 	pret= RNA_function_return(self_func);
-	tlen= PyTuple_GET_SIZE(args);
+	args_len= PyTuple_GET_SIZE(args);
 
-	parms= RNA_parameter_list_create(self_ptr, self_func);
-	RNA_parameter_list_begin(parms, &iter);
+	RNA_parameter_list_create(&parms, self_ptr, self_func);
+	RNA_parameter_list_begin(&parms, &iter);
+	parms_len = RNA_parameter_list_size(&parms);
+
+	if(args_len + (kw ? PyDict_Size(kw):0) > parms_len) {
+		PyErr_Format(PyExc_TypeError, "%.200s.%.200s(): takes at most %d arguments, got %d", RNA_struct_identifier(self_ptr->type), RNA_function_identifier(self_func), parms_len, args_len);
+		err= -1;
+	}
 
 	/* parse function parameters */
-	for (i= 0; iter.valid; RNA_parameter_list_next(&iter)) {
+	for (i= 0; iter.valid && err==0; RNA_parameter_list_next(&iter)) {
 		parm= iter.parm;
 
 		if (parm==pret) {
@@ -1930,27 +1936,27 @@ static PyObject * pyrna_func_call(PyObject * self, PyObject *args, PyObject *kw)
 			continue;
 		}
 
-		pid= RNA_property_identifier(parm);
+		parm_id= RNA_property_identifier(parm);
 		flag= RNA_property_flag(parm);
 		item= NULL;
 
-		if ((i < tlen) && (flag & PROP_REQUIRED)) {
+		if ((i < args_len) && (flag & PROP_REQUIRED)) {
 			item= PyTuple_GET_ITEM(args, i);
 			i++;
 		}
-		else if (kw != NULL)
-			item= PyDict_GetItemString(kw, pid);  /* borrow ref */
+		else if (kw != NULL) {
+			item= PyDict_GetItemString(kw, parm_id);  /* borrow ref */
+			if(item)
+				kw_tot++; /* make sure invalid keywords are not given */
+		}
 
 		if (item==NULL) {
 			if(flag & PROP_REQUIRED) {
-				tid= RNA_struct_identifier(self_ptr->type);
-				fid= RNA_function_identifier(self_func);
-
-				PyErr_Format(PyExc_AttributeError, "%.200s.%.200s(): required parameter \"%.200s\" not specified", tid, fid, pid);
+				PyErr_Format(PyExc_TypeError, "%.200s.%.200s(): required parameter \"%.200s\" not specified", RNA_struct_identifier(self_ptr->type), RNA_function_identifier(self_func), parm_id);
 				err= -1;
 				break;
 			}
-			else
+			else /* PyDict_GetItemString wont raise an error */
 				continue;
 		}
 
@@ -1960,6 +1966,73 @@ static PyObject * pyrna_func_call(PyObject * self, PyObject *args, PyObject *kw)
 			break;
 	}
 
+
+	/* Check if we gave args that dont exist in the function
+	 * printing the error is slow but it should only happen when developing.
+	 * the if below is quick, checking if it passed less keyword args then we gave */
+	if(kw && (PyDict_Size(kw) > kw_tot)) {
+		PyObject *key, *value;
+		Py_ssize_t pos = 0;
+
+		DynStr *bad_args= BLI_dynstr_new();
+		DynStr *good_args= BLI_dynstr_new();
+
+		char *arg_name, *bad_args_str, *good_args_str;
+		int found= 0, first=1;
+
+		while (PyDict_Next(kw, &pos, &key, &value)) {
+
+			arg_name= _PyUnicode_AsString(key);
+			found= 0;
+
+			if(arg_name==NULL) { /* unlikely the argname is not a string but ignore if it is*/
+				PyErr_Clear();
+			}
+			else {
+				/* Search for arg_name */
+				RNA_parameter_list_begin(&parms, &iter);
+				for(; iter.valid; RNA_parameter_list_next(&iter)) {
+					parm= iter.parm;
+					if (strcmp(arg_name, RNA_property_identifier(parm))==0) {
+						found= 1;
+						break;
+					}
+				}
+
+				RNA_parameter_list_end(&iter);
+
+				if(!found) {
+					BLI_dynstr_appendf(bad_args, first ? "%s" : ", %s", arg_name);
+					first= 0;
+				}
+			}
+		}
+
+		/* list good args */
+		first= 1;
+
+		RNA_parameter_list_begin(&parms, &iter);
+		for(; iter.valid; RNA_parameter_list_next(&iter)) {
+			parm= iter.parm;
+			BLI_dynstr_appendf(good_args, first ? "%s" : ", %s", RNA_property_identifier(parm));
+			first= 0;
+		}
+		RNA_parameter_list_end(&iter);
+
+
+		bad_args_str= BLI_dynstr_get_cstring(bad_args);
+		good_args_str= BLI_dynstr_get_cstring(good_args);
+
+		PyErr_Format(PyExc_TypeError, "%.200s.%.200s(): was called with invalid keyword arguments(s) (%s), expected (%s)", RNA_struct_identifier(self_ptr->type), RNA_function_identifier(self_func), bad_args_str, good_args_str);
+
+		BLI_dynstr_free(bad_args);
+		BLI_dynstr_free(good_args);
+		MEM_freeN(bad_args_str);
+		MEM_freeN(good_args_str);
+
+		err= -1;
+	}
+
 	ret= NULL;
 	if (err==0) {
 		/* call function */
@@ -1967,20 +2040,26 @@ static PyObject * pyrna_func_call(PyObject * self, PyObject *args, PyObject *kw)
 		bContext *C= BPy_GetContext();
 
 		BKE_reports_init(&reports, RPT_STORE);
-		RNA_function_call(C, &reports, self_ptr, self_func, parms);
+		RNA_function_call(C, &reports, self_ptr, self_func, &parms);
 
 		err= (BPy_reports_to_error(&reports))? -1: 0;
 		BKE_reports_clear(&reports);
 
 		/* return value */
-		if(err==0)
-			if(pret)
+		if(err==0) {
+			if(pret) {
 				ret= pyrna_param_to_py(&funcptr, pret, retdata);
+
+				/* possible there is an error in conversion */
+				if(ret==NULL)
+					err= -1;
+			}
+		}
 	}
 
 	/* cleanup */
 	RNA_parameter_list_end(&iter);
-	RNA_parameter_list_free(parms);
+	RNA_parameter_list_free(&parms);
 
 	if (ret)
 		return ret;
@@ -2387,7 +2466,7 @@ static PyObject *pyrna_basetype_getattro( BPy_BaseTypeRNA * self, PyObject *pyna
 		return ret;
 	}
 	else { /* Override the error */
-		PyErr_Format(PyExc_AttributeError, "bpy.types.%.200s not a valid RNA_Struct", _PyUnicode_AsString(pyname));
+		PyErr_Format(PyExc_AttributeError, "bpy.types.%.200s RNA_Struct does not exist", _PyUnicode_AsString(pyname));
 		return NULL;
 	}
 }
@@ -2629,7 +2708,7 @@ static int bpy_class_validate(PointerRNA *dummyptr, void *py_data, int *have_fun
 	if (base_class) {
 		if (!PyObject_IsSubclass(py_class, base_class)) {
 			PyObject *name= PyObject_GetAttrString(base_class, "__name__");
-			PyErr_Format( PyExc_AttributeError, "expected %.200s subclass of class \"%.200s\"", class_type, name ? _PyUnicode_AsString(name):"<UNKNOWN>");
+			PyErr_Format( PyExc_TypeError, "expected %.200s subclass of class \"%.200s\"", class_type, name ? _PyUnicode_AsString(name):"<UNKNOWN>");
 			Py_XDECREF(name);
 			return -1;
 		}
@@ -2667,7 +2746,7 @@ static int bpy_class_validate(PointerRNA *dummyptr, void *py_data, int *have_fun
 				fitem= item; /* py 3.x */
 
 			if (PyFunction_Check(fitem)==0) {
-				PyErr_Format( PyExc_AttributeError, "expected %.200s class \"%.200s\" attribute to be a function", class_type, RNA_function_identifier(func));
+				PyErr_Format( PyExc_TypeError, "expected %.200s class \"%.200s\" attribute to be a function", class_type, RNA_function_identifier(func));
 				return -1;
 			}
 
@@ -2795,12 +2874,12 @@ static int bpy_class_call(PointerRNA *ptr, FunctionRNA *func, ParameterList *par
 		}
 		else {
 			Py_DECREF(py_class_instance);
-			PyErr_Format(PyExc_AttributeError, "could not find function %.200s in %.200s to execute callback.", RNA_function_identifier(func), RNA_struct_identifier(ptr->type));
+			PyErr_Format(PyExc_TypeError, "could not find function %.200s in %.200s to execute callback.", RNA_function_identifier(func), RNA_struct_identifier(ptr->type));
 			err= -1;
 		}
 	}
 	else {
-		PyErr_Format(PyExc_AttributeError, "could not create instance of %.200s to call callback function %.200s.", RNA_struct_identifier(ptr->type), RNA_function_identifier(func));
+		PyErr_Format(PyExc_RuntimeError, "could not create instance of %.200s to call callback function %.200s.", RNA_struct_identifier(ptr->type), RNA_function_identifier(func));
 		err= -1;
 	}