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authordkf <donal.k.fellows@manchester.ac.uk>2012-05-20 07:58:11 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2012-05-20 07:58:11 (GMT)
commit40ff07a07969afd5de9232f869a9405dcc68f2a4 (patch)
tree2ccfc6eb96ab5fc4fb4fec69724fe1f02a54f901 /generic
parent6e977b903ee0e35f5b799abe1c8b3c902a5b5cef (diff)
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* generic/tclOOBasic.c (TclOO_Class_Constructor): [Bug 2023112]: Cut
the amount of hackiness in class constructors, and refactor some of the error message handling from [oo::define] to be saner in the face of odd happenings.
Diffstat (limited to 'generic')
-rw-r--r--generic/tclOO.c68
-rw-r--r--generic/tclOOBasic.c138
-rw-r--r--generic/tclOODefineCmds.c103
-rw-r--r--generic/tclOOInt.h9
-rw-r--r--generic/tclOOMethod.c9
5 files changed, 174 insertions, 153 deletions
diff --git a/generic/tclOO.c b/generic/tclOO.c
index d5cc6e1..26e6d75 100644
--- a/generic/tclOO.c
+++ b/generic/tclOO.c
@@ -123,6 +123,16 @@ static const DeclaredClassMethod objMethods[] = {
};
/*
+ * And for the oo::class constructor...
+ */
+
+static const Tcl_MethodType classConstructor = {
+ TCL_OO_METHOD_VERSION_CURRENT,
+ "oo::class constructor",
+ TclOO_Class_Constructor, NULL, NULL
+};
+
+/*
* Scripted parts of TclOO. First, the master script (cannot be outside this
* file).
*/
@@ -135,18 +145,6 @@ static const char *initScript =
/* " tcloo.tcl OO_LIBRARY oo::library;"; */
/*
- * The body of the constructor for oo::class.
- */
-
-static const char *classConstructorBody =
-"set script [list ::oo::define [self] $definitionScript];"
-"lassign [::oo::UpCatch $script] msg opts;"
-"if {[dict get $opts -code] == 1} {"
-" dict set opts -errorline 0xDeadBeef"
-"};"
-"return -options $opts $msg;";
-
-/*
* The scripted part of the definitions of slots.
*/
@@ -340,12 +338,12 @@ InitFoundation(
TclNewLiteralStringObj(fPtr->constructorName, "<constructor>");
TclNewLiteralStringObj(fPtr->destructorName, "<destructor>");
TclNewLiteralStringObj(fPtr->clonedName, "<cloned>");
+ TclNewLiteralStringObj(fPtr->defineName, "::oo::define");
Tcl_IncrRefCount(fPtr->unknownMethodNameObj);
Tcl_IncrRefCount(fPtr->constructorName);
Tcl_IncrRefCount(fPtr->destructorName);
Tcl_IncrRefCount(fPtr->clonedName);
- Tcl_NRCreateCommand(interp, "::oo::UpCatch", TclOOUpcatchCmd,
- TclOONRUpcatch, NULL, NULL);
+ Tcl_IncrRefCount(fPtr->defineName);
Tcl_CreateObjCommand(interp, "::oo::UnknownDefinition",
TclOOUnknownDefinition, NULL, NULL);
TclNewLiteralStringObj(namePtr, "::oo::UnknownDefinition");
@@ -418,28 +416,19 @@ InitFoundation(
bodyPtr = Tcl_NewStringObj(clonedBody, -1);
TclOONewProcMethod(interp, fPtr->objectCls, 0, fPtr->clonedName, argsPtr,
bodyPtr, NULL);
- Tcl_DecrRefCount(argsPtr);
+ TclDecrRefCount(argsPtr);
/*
* Finish setting up the class of classes by marking the 'new' method as
* private; classes, unlike general objects, must have explicit names. We
* also need to create the constructor for classes.
- *
- * The 0xDeadBeef is a special signal to the errorInfo logger that is used
- * by constructors that stops it from generating extra error information
- * that is confusing.
*/
TclNewLiteralStringObj(namePtr, "new");
Tcl_NewInstanceMethod(interp, (Tcl_Object) fPtr->classCls->thisPtr,
namePtr /* keeps ref */, 0 /* ==private */, NULL, NULL);
-
- TclNewLiteralStringObj(argsPtr, "{definitionScript {}}");
- Tcl_IncrRefCount(argsPtr);
- bodyPtr = Tcl_NewStringObj(classConstructorBody, -1);
- fPtr->classCls->constructorPtr = TclOONewProcMethod(interp,
- fPtr->classCls, 0, NULL, argsPtr, bodyPtr, NULL);
- Tcl_DecrRefCount(argsPtr);
+ fPtr->classCls->constructorPtr = (Method *) Tcl_NewMethod(interp,
+ (Tcl_Class) fPtr->classCls, NULL, 0, &classConstructor, NULL);
/*
* Create non-object commands and plug ourselves into the Tcl [info]
@@ -529,10 +518,11 @@ KillFoundation(
DelRef(fPtr->objectCls->thisPtr);
DelRef(fPtr->objectCls);
- Tcl_DecrRefCount(fPtr->unknownMethodNameObj);
- Tcl_DecrRefCount(fPtr->constructorName);
- Tcl_DecrRefCount(fPtr->destructorName);
- Tcl_DecrRefCount(fPtr->clonedName);
+ TclDecrRefCount(fPtr->unknownMethodNameObj);
+ TclDecrRefCount(fPtr->constructorName);
+ TclDecrRefCount(fPtr->destructorName);
+ TclDecrRefCount(fPtr->clonedName);
+ TclDecrRefCount(fPtr->defineName);
ckfree(fPtr);
}
@@ -789,7 +779,7 @@ ObjectRenamedTrace(
if (flags & TCL_TRACE_RENAME) {
if (oPtr->cachedNameObj) {
- Tcl_DecrRefCount(oPtr->cachedNameObj);
+ TclDecrRefCount(oPtr->cachedNameObj);
oPtr->cachedNameObj = NULL;
}
return;
@@ -1044,7 +1034,7 @@ ReleaseClassContents(
Tcl_Obj *filterObj;
FOREACH(filterObj, clsPtr->filters) {
- Tcl_DecrRefCount(filterObj);
+ TclDecrRefCount(filterObj);
}
ckfree(clsPtr->filters.list);
clsPtr->filters.num = 0;
@@ -1123,7 +1113,7 @@ ObjectNamespaceDeleted(
}
FOREACH(filterObj, oPtr->filters) {
- Tcl_DecrRefCount(filterObj);
+ TclDecrRefCount(filterObj);
}
if (i) {
ckfree(oPtr->filters.list);
@@ -1138,7 +1128,7 @@ ObjectNamespaceDeleted(
}
FOREACH(variableObj, oPtr->variables) {
- Tcl_DecrRefCount(variableObj);
+ TclDecrRefCount(variableObj);
}
if (i) {
ckfree(oPtr->variables.list);
@@ -1149,7 +1139,7 @@ ObjectNamespaceDeleted(
}
if (oPtr->cachedNameObj) {
- Tcl_DecrRefCount(oPtr->cachedNameObj);
+ TclDecrRefCount(oPtr->cachedNameObj);
oPtr->cachedNameObj = NULL;
}
@@ -1180,7 +1170,7 @@ ObjectNamespaceDeleted(
}
FOREACH(filterObj, clsPtr->filters) {
- Tcl_DecrRefCount(filterObj);
+ TclDecrRefCount(filterObj);
}
if (i) {
ckfree(clsPtr->filters.list);
@@ -1225,7 +1215,7 @@ ObjectNamespaceDeleted(
TclOODelMethodRef(clsPtr->destructorPtr);
FOREACH(variableObj, clsPtr->variables) {
- Tcl_DecrRefCount(variableObj);
+ TclDecrRefCount(variableObj);
}
if (i) {
ckfree(clsPtr->variables.list);
@@ -2490,7 +2480,7 @@ TclOOObjectCmdCore(
result = oPtr->mapMethodNameProc(interp, (Tcl_Object) oPtr,
(Tcl_Class *) startClsPtr, mappedMethodName);
if (result != TCL_OK) {
- Tcl_DecrRefCount(mappedMethodName);
+ TclDecrRefCount(mappedMethodName);
if (result == TCL_BREAK) {
goto noMapping;
} else if (result == TCL_ERROR) {
@@ -2506,7 +2496,7 @@ TclOOObjectCmdCore(
Tcl_IncrRefCount(mappedMethodName);
contextPtr = TclOOGetCallContext(oPtr, mappedMethodName,
flags | (oPtr->flags & FILTER_HANDLING), methodNamePtr);
- Tcl_DecrRefCount(mappedMethodName);
+ TclDecrRefCount(mappedMethodName);
if (contextPtr == NULL) {
Tcl_AppendResult(interp, "impossible to invoke method \"",
TclGetString(methodNamePtr),
diff --git a/generic/tclOOBasic.c b/generic/tclOOBasic.c
index 329f0a4..5e983fc 100644
--- a/generic/tclOOBasic.c
+++ b/generic/tclOOBasic.c
@@ -19,6 +19,8 @@
static inline Tcl_Object *AddConstructionFinalizer(Tcl_Interp *interp);
static int AfterNRDestructor(ClientData data[],
Tcl_Interp *interp, int result);
+static int DecrRefsPostClassConstructor(ClientData data[],
+ Tcl_Interp *interp, int result);
static int FinalizeConstruction(ClientData data[],
Tcl_Interp *interp, int result);
static int FinalizeEval(ClientData data[],
@@ -70,6 +72,74 @@ FinalizeConstruction(
/*
* ----------------------------------------------------------------------
*
+ * TclOO_Class_Constructor --
+ *
+ * Implementation for oo::class constructor.
+ *
+ * ----------------------------------------------------------------------
+ */
+
+int
+TclOO_Class_Constructor(
+ ClientData clientData,
+ Tcl_Interp *interp,
+ Tcl_ObjectContext context,
+ int objc,
+ Tcl_Obj *const *objv)
+{
+ Object *oPtr = (Object *) Tcl_ObjectContextObject(context);
+ Tcl_Obj *invoke[3];
+
+ if (objc-1 > Tcl_ObjectContextSkippedArgs(context)) {
+ Tcl_WrongNumArgs(interp, Tcl_ObjectContextSkippedArgs(context), objv,
+ "?definitionScript?");
+ return TCL_ERROR;
+ } else if (objc == Tcl_ObjectContextSkippedArgs(context)) {
+ return TCL_OK;
+ }
+
+ /*
+ * Delegate to [oo::define] to do the work.
+ */
+
+ invoke[0] = oPtr->fPtr->defineName;
+ invoke[1] = TclOOObjectName(interp, oPtr);
+ invoke[2] = objv[objc-1];
+
+ /*
+ * Must add references or errors in configuration script will cause
+ * trouble.
+ */
+
+ Tcl_IncrRefCount(invoke[0]);
+ Tcl_IncrRefCount(invoke[1]);
+ Tcl_IncrRefCount(invoke[2]);
+ TclNRAddCallback(interp, DecrRefsPostClassConstructor,
+ invoke[0], invoke[1], invoke[2], NULL);
+
+ /*
+ * Tricky point: do not want the extra reported level in the Tcl stack
+ * trace, so use TCL_EVAL_NOERR.
+ */
+
+ return TclNREvalObjv(interp, 3, invoke, TCL_EVAL_NOERR, NULL);
+}
+
+static int
+DecrRefsPostClassConstructor(
+ ClientData data[],
+ Tcl_Interp *interp,
+ int result)
+{
+ TclDecrRefCount((Tcl_Obj *) data[0]);
+ TclDecrRefCount((Tcl_Obj *) data[1]);
+ TclDecrRefCount((Tcl_Obj *) data[2]);
+ return result;
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
* TclOO_Class_Create --
*
* Implementation for oo::class->create method.
@@ -1141,74 +1211,6 @@ TclOOCopyObjectCmd(
}
/*
- * ----------------------------------------------------------------------
- *
- * TclOOUpcatchCmd --
- *
- * Implementation of the [oo::UpCatch] command, which is a combination of
- * [uplevel 1] and [catch] that makes it easier to write transparent
- * error handling in scripts.
- *
- * ----------------------------------------------------------------------
- */
-
-int
-TclOOUpcatchCmd(
- ClientData ignored,
- Tcl_Interp *interp,
- int objc,
- Tcl_Obj *const objv[])
-{
- return Tcl_NRCallObjProc(interp, TclOONRUpcatch, NULL, objc, objv);
-}
-
-static int
-UpcatchCallback(
- ClientData data[],
- Tcl_Interp *interp,
- int result)
-{
- Interp *iPtr = (Interp *) interp;
- CallFrame *savedFramePtr = data[0];
- Tcl_Obj *resultObj[2];
- int rewind = iPtr->execEnvPtr->rewind;
-
- iPtr->varFramePtr = savedFramePtr;
- if (rewind || Tcl_LimitExceeded(interp)) {
- Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
- "\n (\"UpCatch\" body line %d)", Tcl_GetErrorLine(interp)));
- return TCL_ERROR;
- }
- resultObj[0] = Tcl_GetObjResult(interp);
- resultObj[1] = Tcl_GetReturnOptions(interp, result);
- Tcl_SetObjResult(interp, Tcl_NewListObj(2, resultObj));
- return TCL_OK;
-}
-
-int
-TclOONRUpcatch(
- ClientData ignored,
- Tcl_Interp *interp,
- int objc,
- Tcl_Obj *const objv[])
-{
- Interp *iPtr = (Interp *) interp;
- CallFrame *savedFramePtr = iPtr->varFramePtr;
-
- if (objc != 2) {
- Tcl_WrongNumArgs(interp, 1, objv, "script");
- return TCL_ERROR;
- }
- if (iPtr->varFramePtr->callerVarPtr != NULL) {
- iPtr->varFramePtr = iPtr->varFramePtr->callerVarPtr;
- }
-
- Tcl_NRAddCallback(interp, UpcatchCallback, savedFramePtr, NULL,NULL,NULL);
- return TclNREvalObjEx(interp, objv[1], TCL_EVAL_NOERR,
- iPtr->cmdFramePtr, 1);
-}
-
-/*
* Local Variables:
* mode: c
* c-basic-offset: 4
diff --git a/generic/tclOODefineCmds.c b/generic/tclOODefineCmds.c
index 3d72690..69cffb0 100644
--- a/generic/tclOODefineCmds.c
+++ b/generic/tclOODefineCmds.c
@@ -17,6 +17,13 @@
#include "tclOOInt.h"
/*
+ * The maximum length of fully-qualified object name to use in an errorinfo
+ * message. Longer than this will be curtailed.
+ */
+
+#define OBJNAME_LENGTH_IN_ERRORINFO_LIMIT 30
+
+/*
* Some things that make it easier to declare a slot.
*/
@@ -40,6 +47,8 @@ struct DeclaredSlot {
static inline void BumpGlobalEpoch(Tcl_Interp *interp, Class *classPtr);
static Tcl_Command FindCommand(Tcl_Interp *interp, Tcl_Obj *stringObj,
Tcl_Namespace *const namespacePtr);
+static void GenerateErrorInfo(Tcl_Interp *interp, Object *oPtr,
+ Tcl_Obj *savedNameObj, const char *typeOfSubject);
static inline Class * GetClassInOuterContext(Tcl_Interp *interp,
Tcl_Obj *className, const char *errMsg);
static inline int InitDefineContext(Tcl_Interp *interp,
@@ -673,6 +682,7 @@ TclOOGetDefineCmdContext(
Tcl_Interp *interp)
{
Interp *iPtr = (Interp *) interp;
+ Tcl_Object object;
if ((iPtr->varFramePtr == NULL)
|| (iPtr->varFramePtr->isProcCallFrame != FRAME_IS_OO_DEFINE)) {
@@ -682,7 +692,14 @@ TclOOGetDefineCmdContext(
Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
return NULL;
}
- return (Tcl_Object) iPtr->varFramePtr->clientData;
+ object = iPtr->varFramePtr->clientData;
+ if (Tcl_ObjectDeleted(object)) {
+ Tcl_AppendResult(interp, "this command cannot be called when the "
+ "object has been deleted", NULL);
+ Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
+ return NULL;
+ }
+ return object;
}
/*
@@ -730,6 +747,44 @@ GetClassInOuterContext(
/*
* ----------------------------------------------------------------------
*
+ * GenerateErrorInfo --
+ * Factored out code to generate part of the error trace messages.
+ *
+ * ----------------------------------------------------------------------
+ */
+
+static void
+GenerateErrorInfo(
+ Tcl_Interp *interp, /* Where to store the error info trace. */
+ Object *oPtr, /* What object (or class) was being configured
+ * when the error occurred? */
+ Tcl_Obj *savedNameObj, /* Name of object saved from before script was
+ * evaluated, which is needed if the object
+ * goes away part way through execution. OTOH,
+ * if the object isn't deleted then its
+ * current name (post-execution) has to be
+ * used. This matters, because the object
+ * could have been renamed... */
+ const char *typeOfSubject) /* Part of the message, saying whether it was
+ * an object, class or class-as-object that
+ * was being configured. */
+{
+ int length;
+ Tcl_Obj *realNameObj = Tcl_ObjectDeleted((Tcl_Object) oPtr)
+ ? savedNameObj : TclOOObjectName(interp, oPtr);
+ const char *objName = Tcl_GetStringFromObj(realNameObj, &length);
+ int limit = OBJNAME_LENGTH_IN_ERRORINFO_LIMIT;
+ int overflow = (length > limit);
+
+ Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
+ "\n (in definition script for %s \"%.*s%s\" line %d)",
+ typeOfSubject, (overflow ? limit : length), objName,
+ (overflow ? "..." : ""), Tcl_GetErrorLine(interp)));
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
* TclOODefineObjCmd --
* Implementation of the "oo::define" command. Works by effectively doing
* the same as 'namespace eval', but with extra magic applied so that the
@@ -779,20 +834,15 @@ TclOODefineObjCmd(
AddRef(oPtr);
if (objc == 3) {
+ Tcl_Obj *objNameObj = TclOOObjectName(interp, oPtr);
+
+ Tcl_IncrRefCount(objNameObj);
result = TclEvalObjEx(interp, objv[2], 0,
((Interp *)interp)->cmdFramePtr, 2);
-
if (result == TCL_ERROR) {
- int length;
- const char *objName = Tcl_GetStringFromObj(objv[1], &length);
- int limit = 60;
- int overflow = (length > limit);
-
- Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
- "\n (in definition script for object \"%.*s%s\" line %d)",
- (overflow ? limit : length), objName,
- (overflow ? "..." : ""), Tcl_GetErrorLine(interp)));
+ GenerateErrorInfo(interp, oPtr, objNameObj, "class");
}
+ TclDecrRefCount(objNameObj);
} else {
Tcl_Obj *objPtr, *obj2Ptr, **objs;
Interp *iPtr = (Interp *) interp;
@@ -898,20 +948,15 @@ TclOOObjDefObjCmd(
AddRef(oPtr);
if (objc == 3) {
+ Tcl_Obj *objNameObj = TclOOObjectName(interp, oPtr);
+
+ Tcl_IncrRefCount(objNameObj);
result = TclEvalObjEx(interp, objv[2], 0,
((Interp *)interp)->cmdFramePtr, 2);
-
if (result == TCL_ERROR) {
- int length;
- const char *objName = Tcl_GetStringFromObj(objv[1], &length);
- int limit = 60;
- int overflow = (length > limit);
-
- Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
- "\n (in definition script for object \"%.*s%s\" line %d)",
- (overflow ? limit : length), objName,
- (overflow ? "..." : ""), Tcl_GetErrorLine(interp)));
+ GenerateErrorInfo(interp, oPtr, objNameObj, "object");
}
+ TclDecrRefCount(objNameObj);
} else {
Tcl_Obj *objPtr, *obj2Ptr, **objs;
Interp *iPtr = (Interp *) interp;
@@ -1017,21 +1062,15 @@ TclOODefineSelfObjCmd(
AddRef(oPtr);
if (objc == 2) {
+ Tcl_Obj *objNameObj = TclOOObjectName(interp, oPtr);
+
+ Tcl_IncrRefCount(objNameObj);
result = TclEvalObjEx(interp, objv[1], 0,
((Interp *)interp)->cmdFramePtr, 2);
-
if (result == TCL_ERROR) {
- int length;
- const char *objName = Tcl_GetStringFromObj(
- TclOOObjectName(interp, oPtr), &length);
- int limit = 60;
- int overflow = (length > limit);
-
- Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
- "\n (in definition script for object \"%.*s%s\" line %d)",
- (overflow ? limit : length), objName,
- (overflow ? "..." : ""), Tcl_GetErrorLine(interp)));
+ GenerateErrorInfo(interp, oPtr, objNameObj, "class object");
}
+ TclDecrRefCount(objNameObj);
} else {
Tcl_Obj *objPtr, *obj2Ptr, **objs;
Interp *iPtr = (Interp *) interp;
diff --git a/generic/tclOOInt.h b/generic/tclOOInt.h
index 7988452..631961f 100644
--- a/generic/tclOOInt.h
+++ b/generic/tclOOInt.h
@@ -322,6 +322,7 @@ typedef struct Foundation {
* destructor. */
Tcl_Obj *clonedName; /* Shared object containing the name of a
* "<cloned>" pseudo-constructor. */
+ Tcl_Obj *defineName; /* Fully qualified name of oo::define. */
} Foundation;
/*
@@ -453,6 +454,9 @@ MODULE_SCOPE int TclOOSelfObjCmd(ClientData clientData,
* Method implementations (in tclOOBasic.c).
*/
+MODULE_SCOPE int TclOO_Class_Constructor(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
MODULE_SCOPE int TclOO_Class_Create(ClientData clientData,
Tcl_Interp *interp, Tcl_ObjectContext context,
int objc, Tcl_Obj *const *objv);
@@ -519,8 +523,6 @@ MODULE_SCOPE int TclNRObjectContextInvokeNext(Tcl_Interp *interp,
Tcl_Obj *const *objv, int skip);
MODULE_SCOPE void TclOONewBasicMethod(Tcl_Interp *interp, Class *clsPtr,
const DeclaredClassMethod *dcm);
-MODULE_SCOPE int TclOONRUpcatch(ClientData ignored, Tcl_Interp *interp,
- int objc, Tcl_Obj *const objv[]);
MODULE_SCOPE Tcl_Obj * TclOOObjectName(Tcl_Interp *interp, Object *oPtr);
MODULE_SCOPE void TclOORemoveFromInstances(Object *oPtr, Class *clsPtr);
MODULE_SCOPE void TclOORemoveFromMixinSubs(Class *subPtr,
@@ -532,9 +534,6 @@ MODULE_SCOPE Tcl_Obj * TclOORenderCallChain(Tcl_Interp *interp,
MODULE_SCOPE void TclOOStashContext(Tcl_Obj *objPtr,
CallContext *contextPtr);
MODULE_SCOPE void TclOOSetupVariableResolver(Tcl_Namespace *nsPtr);
-MODULE_SCOPE int TclOOUpcatchCmd(ClientData ignored,
- Tcl_Interp *interp, int objc,
- Tcl_Obj *const objv[]);
/*
* Include all the private API, generated from tclOO.decls.
diff --git a/generic/tclOOMethod.c b/generic/tclOOMethod.c
index 4e7edb8..877c3db 100644
--- a/generic/tclOOMethod.c
+++ b/generic/tclOOMethod.c
@@ -1204,15 +1204,6 @@ ConstructorErrorHandler(
const char *objectName, *kindName;
int objectNameLen;
- if (Tcl_GetErrorLine(interp) == (int) 0xDEADBEEF) {
- /*
- * Horrible hack to deal with certain constructors that must not add
- * information to the error trace.
- */
-
- return;
- }
-
if (mPtr->declaringObjectPtr != NULL) {
declarerPtr = mPtr->declaringObjectPtr;
kindName = "object";