/* * tclOO.c -- * * This file contains the object-system core (NB: not Tcl_Obj, but ::oo) * * Copyright (c) 2005-2012 by Donal K. Fellows * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "tclInt.h" #include "tclOOInt.h" /* * Commands in oo::define. */ static const struct { const char *name; Tcl_ObjCmdProc *objProc; int flag; } defineCmds[] = { {"constructor", TclOODefineConstructorObjCmd, 0}, {"deletemethod", TclOODefineDeleteMethodObjCmd, 0}, {"destructor", TclOODefineDestructorObjCmd, 0}, {"export", TclOODefineExportObjCmd, 0}, {"forward", TclOODefineForwardObjCmd, 0}, {"method", TclOODefineMethodObjCmd, 0}, {"renamemethod", TclOODefineRenameMethodObjCmd, 0}, {"self", TclOODefineSelfObjCmd, 0}, {"unexport", TclOODefineUnexportObjCmd, 0}, {NULL, NULL, 0} }, objdefCmds[] = { {"class", TclOODefineClassObjCmd, 1}, {"deletemethod", TclOODefineDeleteMethodObjCmd, 1}, {"export", TclOODefineExportObjCmd, 1}, {"forward", TclOODefineForwardObjCmd, 1}, {"method", TclOODefineMethodObjCmd, 1}, {"renamemethod", TclOODefineRenameMethodObjCmd, 1}, {"unexport", TclOODefineUnexportObjCmd, 1}, {NULL, NULL, 0} }; /* * What sort of size of things we like to allocate. */ #define ALLOC_CHUNK 8 /* * Function declarations for things defined in this file. */ static Class * AllocClass(Tcl_Interp *interp, Object *useThisObj); static Object * AllocObject(Tcl_Interp *interp, const char *nameStr, const char *nsNameStr); static int CloneClassMethod(Tcl_Interp *interp, Class *clsPtr, Method *mPtr, Tcl_Obj *namePtr, Method **newMPtrPtr); static int CloneObjectMethod(Tcl_Interp *interp, Object *oPtr, Method *mPtr, Tcl_Obj *namePtr); static void DeletedDefineNamespace(ClientData clientData); static void DeletedObjdefNamespace(ClientData clientData); static void DeletedHelpersNamespace(ClientData clientData); static int FinalizeAlloc(ClientData data[], Tcl_Interp *interp, int result); static int FinalizeNext(ClientData data[], Tcl_Interp *interp, int result); static int FinalizeObjectCall(ClientData data[], Tcl_Interp *interp, int result); static int InitFoundation(Tcl_Interp *interp); static void KillFoundation(ClientData clientData, Tcl_Interp *interp); static void MyDeleted(ClientData clientData); static void ObjectNamespaceDeleted(ClientData clientData); static void ObjectRenamedTrace(ClientData clientData, Tcl_Interp *interp, const char *oldName, const char *newName, int flags); static void ReleaseClassContents(Tcl_Interp *interp,Object *oPtr); static inline void SquelchCachedName(Object *oPtr); static void SquelchedNsFirst(ClientData clientData); static int PublicObjectCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv); static int PublicNRObjectCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv); static int PrivateObjectCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv); static int PrivateNRObjectCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv); /* * Methods in the oo::object and oo::class classes. First, we define a helper * macro that makes building the method type declaration structure a lot * easier. No point in making life harder than it has to be! * * Note that the core methods don't need clone or free proc callbacks. */ #define DCM(name,visibility,proc) \ {name,visibility,\ {TCL_OO_METHOD_VERSION_CURRENT,"core method: "#name,proc,NULL,NULL}} static const DeclaredClassMethod objMethods[] = { DCM("destroy", 1, TclOO_Object_Destroy), DCM("eval", 0, TclOO_Object_Eval), DCM("unknown", 0, TclOO_Object_Unknown), DCM("variable", 0, TclOO_Object_LinkVar), DCM("varname", 0, TclOO_Object_VarName), {NULL, 0, {0, NULL, NULL, NULL, NULL}} }, clsMethods[] = { DCM("create", 1, TclOO_Class_Create), DCM("new", 1, TclOO_Class_New), DCM("createWithNamespace", 0, TclOO_Class_CreateNs), {NULL, 0, {0, NULL, NULL, NULL, NULL}} }; /* * 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). */ static const char *initScript = "package ifneeded TclOO " TCLOO_PATCHLEVEL " {# Already present, OK?};" "namespace eval ::oo { variable version " TCLOO_VERSION " };" "namespace eval ::oo { variable patchlevel " TCLOO_PATCHLEVEL " };"; /* "tcl_findLibrary tcloo $oo::version $oo::version" */ /* " tcloo.tcl OO_LIBRARY oo::library;"; */ /* * The scripted part of the definitions of slots. */ static const char *slotScript = "::oo::define ::oo::Slot {\n" " method Get {} {error unimplemented}\n" " method Set list {error unimplemented}\n" " method -set args {\n" " uplevel 1 [list [namespace which my] Set $args]\n" " }\n" " method -append args {\n" " uplevel 1 [list [namespace which my] Set [list" " {*}[uplevel 1 [list [namespace which my] Get]] {*}$args]]\n" " }\n" " method -clear {} {uplevel 1 [list [namespace which my] Set {}]}\n" " forward --default-operation my -append\n" " method unknown {args} {\n" " set def --default-operation\n" " if {[llength $args] == 0} {\n" " return [uplevel 1 [list [namespace which my] $def]]\n" " } elseif {![string match -* [lindex $args 0]]} {\n" " return [uplevel 1 [list [namespace which my] $def {*}$args]]\n" " }\n" " next {*}$args\n" " }\n" " export -set -append -clear\n" " unexport unknown destroy\n" "}\n" "::oo::objdefine ::oo::define::superclass forward --default-operation my -set\n" "::oo::objdefine ::oo::define::mixin forward --default-operation my -set\n" "::oo::objdefine ::oo::objdefine::mixin forward --default-operation my -set\n"; /* * The body of the method of oo::object. */ static const char *clonedBody = "foreach p [info procs [info object namespace $originObject]::*] {" " set args [info args $p];" " set idx -1;" " foreach a $args {" " lset args [incr idx] " " [if {[info default $p $a d]} {list $a $d} {list $a}]" " };" " set b [info body $p];" " set p [namespace tail $p];" " proc $p $args $b;" "};" "foreach v [info vars [info object namespace $originObject]::*] {" " upvar 0 $v vOrigin;" " namespace upvar [namespace current] [namespace tail $v] vNew;" " if {[info exists vOrigin]} {" " if {[array exists vOrigin]} {" " array set vNew [array get vOrigin];" " } else {" " set vNew $vOrigin;" " }" " }" "}"; /* * The actual definition of the variable holding the TclOO stub table. */ MODULE_SCOPE const TclOOStubs tclOOStubs; /* * Convenience macro for getting the foundation from an interpreter. */ #define GetFoundation(interp) \ ((Foundation *)((Interp *)(interp))->objectFoundation) /* * Macros to make inspecting into the guts of an object cleaner. * * The ocPtr parameter (only in these macros) is assumed to work fine with * either an oPtr or a classPtr. Note that the roots oo::object and oo::class * have _both_ their object and class flags tagged with ROOT_OBJECT and * ROOT_CLASS respectively. */ #define Deleted(oPtr) (((Object *)(oPtr))->command == NULL) #define IsRootObject(ocPtr) ((ocPtr)->flags & ROOT_OBJECT) #define IsRootClass(ocPtr) ((ocPtr)->flags & ROOT_CLASS) #define IsRoot(ocPtr) ((ocPtr)->flags & (ROOT_OBJECT|ROOT_CLASS)) /* * ---------------------------------------------------------------------- * * TclOOInit -- * * Called to initialise the OO system within an interpreter. * * Result: * TCL_OK if the setup succeeded. Currently assumed to always work. * * Side effects: * Creates namespaces, commands, several classes and a number of * callbacks. Upon return, the OO system is ready for use. * * ---------------------------------------------------------------------- */ int TclOOInit( Tcl_Interp *interp) /* The interpreter to install into. */ { /* * Build the core of the OO system. */ if (InitFoundation(interp) != TCL_OK) { return TCL_ERROR; } /* * Run our initialization script and, if that works, declare the package * to be fully provided. */ if (Tcl_EvalEx(interp, initScript, -1, 0) != TCL_OK) { return TCL_ERROR; } return Tcl_PkgProvideEx(interp, "TclOO", TCLOO_PATCHLEVEL, (ClientData) &tclOOStubs); } /* * ---------------------------------------------------------------------- * * TclOOGetFoundation -- * * Get a reference to the OO core class system. * * ---------------------------------------------------------------------- */ Foundation * TclOOGetFoundation( Tcl_Interp *interp) { return GetFoundation(interp); } /* * ---------------------------------------------------------------------- * * InitFoundation -- * * Set up the core of the OO core class system. This is a structure * holding references to the magical bits that need to be known about in * other places, plus the oo::object and oo::class classes. * * ---------------------------------------------------------------------- */ static int InitFoundation( Tcl_Interp *interp) { static Tcl_ThreadDataKey tsdKey; ThreadLocalData *tsdPtr = Tcl_GetThreadData(&tsdKey, sizeof(ThreadLocalData)); Foundation *fPtr = ckalloc(sizeof(Foundation)); Tcl_Obj *namePtr, *argsPtr, *bodyPtr; Tcl_DString buffer; Command *cmdPtr; int i; /* * Initialize the structure that holds the OO system core. This is * attached to the interpreter via an assocData entry; not very efficient, * but the best we can do without hacking the core more. */ memset(fPtr, 0, sizeof(Foundation)); ((Interp *) interp)->objectFoundation = fPtr; fPtr->interp = interp; fPtr->ooNs = Tcl_CreateNamespace(interp, "::oo", fPtr, NULL); Tcl_Export(interp, fPtr->ooNs, "[a-z]*", 1); fPtr->defineNs = Tcl_CreateNamespace(interp, "::oo::define", fPtr, DeletedDefineNamespace); fPtr->objdefNs = Tcl_CreateNamespace(interp, "::oo::objdefine", fPtr, DeletedObjdefNamespace); fPtr->helpersNs = Tcl_CreateNamespace(interp, "::oo::Helpers", fPtr, DeletedHelpersNamespace); fPtr->epoch = 0; fPtr->tsdPtr = tsdPtr; TclNewLiteralStringObj(fPtr->unknownMethodNameObj, "unknown"); TclNewLiteralStringObj(fPtr->constructorName, ""); TclNewLiteralStringObj(fPtr->destructorName, ""); TclNewLiteralStringObj(fPtr->clonedName, ""); TclNewLiteralStringObj(fPtr->defineName, "::oo::define"); Tcl_IncrRefCount(fPtr->unknownMethodNameObj); Tcl_IncrRefCount(fPtr->constructorName); Tcl_IncrRefCount(fPtr->destructorName); Tcl_IncrRefCount(fPtr->clonedName); Tcl_IncrRefCount(fPtr->defineName); Tcl_CreateObjCommand(interp, "::oo::UnknownDefinition", TclOOUnknownDefinition, NULL, NULL); TclNewLiteralStringObj(namePtr, "::oo::UnknownDefinition"); Tcl_SetNamespaceUnknownHandler(interp, fPtr->defineNs, namePtr); Tcl_SetNamespaceUnknownHandler(interp, fPtr->objdefNs, namePtr); /* * Create the subcommands in the oo::define and oo::objdefine spaces. */ Tcl_DStringInit(&buffer); for (i=0 ; defineCmds[i].name ; i++) { TclDStringAppendLiteral(&buffer, "::oo::define::"); Tcl_DStringAppend(&buffer, defineCmds[i].name, -1); Tcl_CreateObjCommand(interp, Tcl_DStringValue(&buffer), defineCmds[i].objProc, INT2PTR(defineCmds[i].flag), NULL); Tcl_DStringFree(&buffer); } for (i=0 ; objdefCmds[i].name ; i++) { TclDStringAppendLiteral(&buffer, "::oo::objdefine::"); Tcl_DStringAppend(&buffer, objdefCmds[i].name, -1); Tcl_CreateObjCommand(interp, Tcl_DStringValue(&buffer), objdefCmds[i].objProc, INT2PTR(objdefCmds[i].flag), NULL); Tcl_DStringFree(&buffer); } Tcl_CallWhenDeleted(interp, KillFoundation, NULL); /* * Create the objects at the core of the object system. These need to be * spliced manually. */ fPtr->objectCls = AllocClass(interp, AllocObject(interp, "::oo::object", NULL)); fPtr->classCls = AllocClass(interp, AllocObject(interp, "::oo::class", NULL)); fPtr->objectCls->thisPtr->selfCls = fPtr->classCls; fPtr->objectCls->thisPtr->flags |= ROOT_OBJECT; fPtr->objectCls->flags |= ROOT_OBJECT; fPtr->objectCls->superclasses.num = 0; ckfree(fPtr->objectCls->superclasses.list); fPtr->objectCls->superclasses.list = NULL; fPtr->classCls->thisPtr->selfCls = fPtr->classCls; fPtr->classCls->thisPtr->flags |= ROOT_CLASS; fPtr->classCls->flags |= ROOT_CLASS; TclOOAddToInstances(fPtr->objectCls->thisPtr, fPtr->classCls); TclOOAddToInstances(fPtr->classCls->thisPtr, fPtr->classCls); AddRef(fPtr->objectCls->thisPtr); AddRef(fPtr->objectCls); /* * Basic method declarations for the core classes. */ for (i=0 ; objMethods[i].name ; i++) { TclOONewBasicMethod(interp, fPtr->objectCls, &objMethods[i]); } for (i=0 ; clsMethods[i].name ; i++) { TclOONewBasicMethod(interp, fPtr->classCls, &clsMethods[i]); } /* * Create the default method implementation, used when 'oo::copy' * is called to finish the copying of one object to another. */ TclNewLiteralStringObj(argsPtr, "originObject"); Tcl_IncrRefCount(argsPtr); bodyPtr = Tcl_NewStringObj(clonedBody, -1); TclOONewProcMethod(interp, fPtr->objectCls, 0, fPtr->clonedName, argsPtr, bodyPtr, NULL); 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. */ TclNewLiteralStringObj(namePtr, "new"); Tcl_NewInstanceMethod(interp, (Tcl_Object) fPtr->classCls->thisPtr, namePtr /* keeps ref */, 0 /* ==private */, NULL, NULL); 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] * ensemble. */ cmdPtr = (Command *) Tcl_NRCreateCommand(interp, "::oo::Helpers::next", NULL, TclOONextObjCmd, NULL, NULL); cmdPtr->compileProc = TclCompileObjectNextCmd; cmdPtr = (Command *) Tcl_NRCreateCommand(interp, "::oo::Helpers::nextto", NULL, TclOONextToObjCmd, NULL, NULL); cmdPtr->compileProc = TclCompileObjectNextToCmd; cmdPtr = (Command *) Tcl_CreateObjCommand(interp, "::oo::Helpers::self", TclOOSelfObjCmd, NULL, NULL); cmdPtr->compileProc = TclCompileObjectSelfCmd; Tcl_CreateObjCommand(interp, "::oo::define", TclOODefineObjCmd, NULL, NULL); Tcl_CreateObjCommand(interp, "::oo::objdefine", TclOOObjDefObjCmd, NULL, NULL); Tcl_CreateObjCommand(interp, "::oo::copy", TclOOCopyObjectCmd, NULL,NULL); TclOOInitInfo(interp); /* * Now make the class of slots. */ if (TclOODefineSlots(fPtr) != TCL_OK) { return TCL_ERROR; } return Tcl_EvalEx(interp, slotScript, -1, 0); } /* * ---------------------------------------------------------------------- * * DeletedDefineNamespace, DeletedObjdefNamespace, DeletedHelpersNamespace -- * * Simple helpers used to clear fields of the foundation when they no * longer hold useful information. * * ---------------------------------------------------------------------- */ static void DeletedDefineNamespace( ClientData clientData) { Foundation *fPtr = clientData; fPtr->defineNs = NULL; } static void DeletedObjdefNamespace( ClientData clientData) { Foundation *fPtr = clientData; fPtr->objdefNs = NULL; } static void DeletedHelpersNamespace( ClientData clientData) { Foundation *fPtr = clientData; fPtr->helpersNs = NULL; } /* * ---------------------------------------------------------------------- * * KillFoundation -- * * Delete those parts of the OO core that are not deleted automatically * when the objects and classes themselves are destroyed. * * ---------------------------------------------------------------------- */ static void KillFoundation( ClientData clientData, /* Pointer to the OO system foundation * structure. */ Tcl_Interp *interp) /* The interpreter containing the OO system * foundation. */ { Foundation *fPtr = GetFoundation(interp); DelRef(fPtr->objectCls->thisPtr); DelRef(fPtr->objectCls); TclDecrRefCount(fPtr->unknownMethodNameObj); TclDecrRefCount(fPtr->constructorName); TclDecrRefCount(fPtr->destructorName); TclDecrRefCount(fPtr->clonedName); TclDecrRefCount(fPtr->defineName); ckfree(fPtr); } /* * ---------------------------------------------------------------------- * * AllocObject -- * * Allocate an object of basic type. Does not splice the object into its * class's instance list. * * ---------------------------------------------------------------------- */ static Object * AllocObject( Tcl_Interp *interp, /* Interpreter within which to create the * object. */ const char *nameStr, /* The name of the object to create, or NULL * if the OO system should pick the object * name itself (equal to the namespace * name). */ const char *nsNameStr) /* The name of the namespace to create, or * NULL if the OO system should pick a unique * name itself. If this is non-NULL but names * a namespace that already exists, the effect * will be the same as if this was NULL. */ { Foundation *fPtr = GetFoundation(interp); Object *oPtr; Command *cmdPtr; CommandTrace *tracePtr; int creationEpoch, ignored; oPtr = ckalloc(sizeof(Object)); memset(oPtr, 0, sizeof(Object)); /* * Every object has a namespace; make one. Note that this also normally * computes the creation epoch value for the object, a sequence number * that is unique to the object (and which allows us to manage method * caching without comparing pointers). * * When creating a namespace, we first check to see if the caller * specified the name for the namespace. If not, we generate namespace * names using the epoch until such time as a new namespace is actually * created. */ if (nsNameStr != NULL) { oPtr->namespacePtr = Tcl_CreateNamespace(interp, nsNameStr, oPtr, ObjectNamespaceDeleted); if (oPtr->namespacePtr != NULL) { creationEpoch = ++fPtr->tsdPtr->nsCount; goto configNamespace; } Tcl_ResetResult(interp); } while (1) { char objName[10 + TCL_INTEGER_SPACE]; sprintf(objName, "::oo::Obj%d", ++fPtr->tsdPtr->nsCount); oPtr->namespacePtr = Tcl_CreateNamespace(interp, objName, oPtr, ObjectNamespaceDeleted); if (oPtr->namespacePtr != NULL) { creationEpoch = fPtr->tsdPtr->nsCount; break; } /* * Could not make that namespace, so we make another. But first we * have to get rid of the error message from Tcl_CreateNamespace, * since that's something that should not be exposed to the user. */ Tcl_ResetResult(interp); } /* * Make the namespace know about the helper commands. This grants access * to the [self] and [next] commands. */ configNamespace: if (fPtr->helpersNs != NULL) { TclSetNsPath((Namespace *) oPtr->namespacePtr, 1, &fPtr->helpersNs); } TclOOSetupVariableResolver(oPtr->namespacePtr); /* * Suppress use of compiled versions of the commands in this object's * namespace and its children; causes wrong behaviour without expensive * recompilation. [Bug 2037727] */ ((Namespace *) oPtr->namespacePtr)->flags |= NS_SUPPRESS_COMPILATION; /* * Set up a callback to get notification of the deletion of a namespace * when enough of the namespace still remains to execute commands and * access variables in it. [Bug 2950259] */ ((Namespace *) oPtr->namespacePtr)->earlyDeleteProc = SquelchedNsFirst; /* * Fill in the rest of the non-zero/NULL parts of the structure. */ oPtr->fPtr = fPtr; oPtr->selfCls = fPtr->objectCls; oPtr->creationEpoch = creationEpoch; oPtr->refCount = 1; oPtr->flags = USE_CLASS_CACHE; /* * Finally, create the object commands and initialize the trace on the * public command (so that the object structures are deleted when the * command is deleted). */ if (!nameStr) { oPtr->command = Tcl_CreateObjCommand(interp, oPtr->namespacePtr->fullName, PublicObjectCmd, oPtr, NULL); } else if (nameStr[0] == ':' && nameStr[1] == ':') { oPtr->command = Tcl_CreateObjCommand(interp, nameStr, PublicObjectCmd, oPtr, NULL); } else { Tcl_DString buffer; Tcl_DStringInit(&buffer); Tcl_DStringAppend(&buffer, Tcl_GetCurrentNamespace(interp)->fullName, -1); TclDStringAppendLiteral(&buffer, "::"); Tcl_DStringAppend(&buffer, nameStr, -1); oPtr->command = Tcl_CreateObjCommand(interp, Tcl_DStringValue(&buffer), PublicObjectCmd, oPtr, NULL); Tcl_DStringFree(&buffer); } /* * Add the NRE command and trace directly. While this breaks a number of * abstractions, it is faster and we're inside Tcl here so we're allowed. */ cmdPtr = (Command *) oPtr->command; cmdPtr->nreProc = PublicNRObjectCmd; cmdPtr->tracePtr = tracePtr = ckalloc(sizeof(CommandTrace)); tracePtr->traceProc = ObjectRenamedTrace; tracePtr->clientData = oPtr; tracePtr->flags = TCL_TRACE_RENAME|TCL_TRACE_DELETE; tracePtr->nextPtr = NULL; tracePtr->refCount = 1; /* * Access the namespace command table directly when creating "my" to avoid * a bottleneck in string manipulation. Another abstraction-buster. */ cmdPtr = ckalloc(sizeof(Command)); memset(cmdPtr, 0, sizeof(Command)); cmdPtr->nsPtr = (Namespace *) oPtr->namespacePtr; cmdPtr->hPtr = Tcl_CreateHashEntry(&cmdPtr->nsPtr->cmdTable, "my", &ignored); cmdPtr->refCount = 1; cmdPtr->objProc = PrivateObjectCmd; cmdPtr->deleteProc = MyDeleted; cmdPtr->objClientData = cmdPtr->deleteData = oPtr; cmdPtr->proc = TclInvokeObjectCommand; cmdPtr->clientData = cmdPtr; cmdPtr->nreProc = PrivateNRObjectCmd; Tcl_SetHashValue(cmdPtr->hPtr, cmdPtr); oPtr->myCommand = (Tcl_Command) cmdPtr; return oPtr; } /* * ---------------------------------------------------------------------- * * SquelchCachedName -- * * Encapsulates how to throw away a cached object name. Called from * object rename traces and at object destruction. * * ---------------------------------------------------------------------- */ static inline void SquelchCachedName( Object *oPtr) { if (oPtr->cachedNameObj) { Tcl_DecrRefCount(oPtr->cachedNameObj); oPtr->cachedNameObj = NULL; } } /* * ---------------------------------------------------------------------- * * MyDeleted -- * * This callback is triggered when the object's [my] command is deleted * by any mechanism. It just marks the object as not having a [my] * command, and so prevents cleanup of that when the object itself is * deleted. * * ---------------------------------------------------------------------- */ static void MyDeleted( ClientData clientData) /* Reference to the object whose [my] has been * squelched. */ { register Object *oPtr = clientData; oPtr->myCommand = NULL; } /* * ---------------------------------------------------------------------- * * SquelchedNsFirst -- * * This callback is triggered when the object's namespace is deleted by * any mechanism. It deletes the object's public command if it has not * already been deleted, so ensuring that destructors get run at an * appropriate time. [Bug 2950259] * * ---------------------------------------------------------------------- */ static void SquelchedNsFirst( ClientData clientData) { Object *oPtr = clientData; if (oPtr->command) { Tcl_DeleteCommandFromToken(oPtr->fPtr->interp, oPtr->command); } } /* * ---------------------------------------------------------------------- * * ObjectRenamedTrace -- * * This callback is triggered when the object is deleted by any * mechanism. It runs the destructors and arranges for the actual cleanup * of the object's namespace, which in turn triggers cleansing of the * object data structures. * * ---------------------------------------------------------------------- */ static void ObjectRenamedTrace( ClientData clientData, /* The object being deleted. */ Tcl_Interp *interp, /* The interpreter containing the object. */ const char *oldName, /* What the object was (last) called. */ const char *newName, /* Always NULL. */ int flags) /* Why was the object deleted? */ { Object *oPtr = clientData; Foundation *fPtr = oPtr->fPtr; /* * If this is a rename and not a delete of the object, we just flush the * cache of the object name. */ if (flags & TCL_TRACE_RENAME) { SquelchCachedName(oPtr); return; } /* * Oh dear, the object really is being deleted. Handle this by running the * destructors and deleting the object's namespace, which in turn causes * the real object structures to be deleted. * * Note that it is possible for the namespace to be deleted before the * command. Because of that case, we must take care here to mark the * command as being deleted so that if we return here we don't run into * reentrancy problems. * * We also do not run destructors on the core class objects when the * interpreter is being deleted; their incestuous nature causes problems * in that case when the destructor is partially deleted before the uses * of it have gone. [Bug 2949397] */ AddRef(oPtr); AddRef(fPtr->classCls); AddRef(fPtr->objectCls); AddRef(fPtr->classCls->thisPtr); AddRef(fPtr->objectCls->thisPtr); oPtr->command = NULL; if (!(oPtr->flags & DESTRUCTOR_CALLED) && !Tcl_InterpDeleted(interp)) { CallContext *contextPtr = TclOOGetCallContext(oPtr, NULL, DESTRUCTOR, NULL); int result; Tcl_InterpState state; oPtr->flags |= DESTRUCTOR_CALLED; if (contextPtr != NULL) { contextPtr->callPtr->flags |= DESTRUCTOR; contextPtr->skip = 0; state = Tcl_SaveInterpState(interp, TCL_OK); result = Tcl_NRCallObjProc(interp, TclOOInvokeContext, contextPtr, 0, NULL); if (result != TCL_OK) { Tcl_BackgroundException(interp, result); } Tcl_RestoreInterpState(interp, state); TclOODeleteContext(contextPtr); } } /* * OK, the destructor's been run. Time to splat the class data (if any) * and nuke the namespace (which triggers the final crushing of the object * structure itself). * * The class of objects needs some special care; if it is deleted (and * we're not killing the whole interpreter) we force the delete of the * class of classes now as well. Due to the incestuous nature of those two * classes, if one goes the other must too and yet the tangle can * sometimes not go away automatically; we force it here. [Bug 2962664] */ if (!Tcl_InterpDeleted(interp) && IsRootObject(oPtr) && !Deleted(fPtr->classCls->thisPtr)) { Tcl_DeleteCommandFromToken(interp, fPtr->classCls->thisPtr->command); } if (oPtr->classPtr != NULL) { AddRef(oPtr->classPtr); ReleaseClassContents(interp, oPtr); } /* * The namespace is only deleted if it hasn't already been deleted. [Bug * 2950259] */ if (((Namespace *) oPtr->namespacePtr)->earlyDeleteProc != NULL) { Tcl_DeleteNamespace(oPtr->namespacePtr); } if (oPtr->classPtr) { DelRef(oPtr->classPtr); } DelRef(fPtr->classCls->thisPtr); DelRef(fPtr->objectCls->thisPtr); DelRef(fPtr->classCls); DelRef(fPtr->objectCls); DelRef(oPtr); } /* * ---------------------------------------------------------------------- * * ReleaseClassContents -- * * Tear down the special class data structure, including deleting all * dependent classes and objects. * * ---------------------------------------------------------------------- */ static void ReleaseClassContents( Tcl_Interp *interp, /* The interpreter containing the class. */ Object *oPtr) /* The object representing the class. */ { FOREACH_HASH_DECLS; int i; Class *clsPtr = oPtr->classPtr, *mixinSubclassPtr, *subclassPtr; Object *instancePtr; Foundation *fPtr = oPtr->fPtr; /* * Sanity check! */ if (!Deleted(oPtr)) { if (IsRootClass(oPtr)) { Tcl_Panic("deleting class structure for non-deleted %s", "::oo::class"); } else if (IsRootObject(oPtr)) { Tcl_Panic("deleting class structure for non-deleted %s", "::oo::object"); } else { Tcl_Panic("deleting class structure for non-deleted %s", "general object"); } } /* * Lock a number of dependent objects until we've stopped putting our * fingers in them. */ FOREACH(mixinSubclassPtr, clsPtr->mixinSubs) { if (mixinSubclassPtr != NULL) { AddRef(mixinSubclassPtr); AddRef(mixinSubclassPtr->thisPtr); } } FOREACH(subclassPtr, clsPtr->subclasses) { if (subclassPtr != NULL && !IsRoot(subclassPtr)) { AddRef(subclassPtr); AddRef(subclassPtr->thisPtr); } } if (!IsRootClass(oPtr)) { FOREACH(instancePtr, clsPtr->instances) { if (instancePtr != NULL && !IsRoot(instancePtr)) { AddRef(instancePtr); } } } /* * Squelch classes that this class has been mixed into. */ FOREACH(mixinSubclassPtr, clsPtr->mixinSubs) { if (mixinSubclassPtr == NULL) { continue; } if (!Deleted(mixinSubclassPtr->thisPtr)) { Tcl_DeleteCommandFromToken(interp, mixinSubclassPtr->thisPtr->command); } DelRef(mixinSubclassPtr->thisPtr); DelRef(mixinSubclassPtr); } if (clsPtr->mixinSubs.list != NULL) { ckfree(clsPtr->mixinSubs.list); clsPtr->mixinSubs.list = NULL; clsPtr->mixinSubs.num = 0; } /* * Squelch subclasses of this class. */ FOREACH(subclassPtr, clsPtr->subclasses) { if (subclassPtr == NULL || IsRoot(subclassPtr)) { continue; } if (!Deleted(subclassPtr->thisPtr)) { Tcl_DeleteCommandFromToken(interp, subclassPtr->thisPtr->command); } DelRef(subclassPtr->thisPtr); DelRef(subclassPtr); } if (clsPtr->subclasses.list != NULL) { ckfree(clsPtr->subclasses.list); clsPtr->subclasses.list = NULL; clsPtr->subclasses.num = 0; } /* * Squelch instances of this class (includes objects we're mixed into). */ if (!IsRootClass(oPtr)) { FOREACH(instancePtr, clsPtr->instances) { if (instancePtr == NULL || IsRoot(instancePtr)) { continue; } if (!Deleted(instancePtr)) { Tcl_DeleteCommandFromToken(interp, instancePtr->command); } DelRef(instancePtr); } } if (clsPtr->instances.list != NULL) { ckfree(clsPtr->instances.list); clsPtr->instances.list = NULL; clsPtr->instances.num = 0; } /* * Special: We delete these after everything else. */ if (IsRootClass(oPtr) && !Deleted(fPtr->objectCls->thisPtr)) { Tcl_DeleteCommandFromToken(interp, fPtr->objectCls->thisPtr->command); } /* * Squelch method implementation chain caches. */ if (clsPtr->constructorChainPtr) { TclOODeleteChain(clsPtr->constructorChainPtr); clsPtr->constructorChainPtr = NULL; } if (clsPtr->destructorChainPtr) { TclOODeleteChain(clsPtr->destructorChainPtr); clsPtr->destructorChainPtr = NULL; } if (clsPtr->classChainCache) { CallChain *callPtr; FOREACH_HASH_VALUE(callPtr, clsPtr->classChainCache) { TclOODeleteChain(callPtr); } Tcl_DeleteHashTable(clsPtr->classChainCache); ckfree(clsPtr->classChainCache); clsPtr->classChainCache = NULL; } /* * Squelch our filter list. */ if (clsPtr->filters.num) { Tcl_Obj *filterObj; FOREACH(filterObj, clsPtr->filters) { TclDecrRefCount(filterObj); } ckfree(clsPtr->filters.list); clsPtr->filters.num = 0; } /* * Squelch our metadata. */ if (clsPtr->metadataPtr != NULL) { Tcl_ObjectMetadataType *metadataTypePtr; ClientData value; FOREACH_HASH(metadataTypePtr, value, clsPtr->metadataPtr) { metadataTypePtr->deleteProc(value); } Tcl_DeleteHashTable(clsPtr->metadataPtr); ckfree(clsPtr->metadataPtr); clsPtr->metadataPtr = NULL; } } /* * ---------------------------------------------------------------------- * * ObjectNamespaceDeleted -- * * Callback when the object's namespace is deleted. Used to clean up the * data structures associated with the object. The complicated bit is * that this can sometimes happen before the object's command is deleted * (interpreter teardown is complex!) * * ---------------------------------------------------------------------- */ static void ObjectNamespaceDeleted( ClientData clientData) /* Pointer to the class whose namespace is * being deleted. */ { Object *oPtr = clientData; FOREACH_HASH_DECLS; Class *clsPtr = oPtr->classPtr, *mixinPtr; Method *mPtr; Tcl_Obj *filterObj, *variableObj; int i; /* * Instruct everyone to no longer use any allocated fields of the object. * Also delete the commands that refer to the object at this point (if * they still exist) because otherwise their references to the object * point into freed memory, allowing crashes. */ if (oPtr->command) { Tcl_DeleteCommandFromToken(oPtr->fPtr->interp, oPtr->command); } if (oPtr->myCommand) { Tcl_DeleteCommandFromToken(oPtr->fPtr->interp, oPtr->myCommand); } /* * Splice the object out of its context. After this, we must *not* call * methods on the object. */ if (!IsRootObject(oPtr)) { TclOORemoveFromInstances(oPtr, oPtr->selfCls); } FOREACH(mixinPtr, oPtr->mixins) { TclOORemoveFromInstances(oPtr, mixinPtr); } if (i) { ckfree(oPtr->mixins.list); } FOREACH(filterObj, oPtr->filters) { TclDecrRefCount(filterObj); } if (i) { ckfree(oPtr->filters.list); } if (oPtr->methodsPtr) { FOREACH_HASH_VALUE(mPtr, oPtr->methodsPtr) { TclOODelMethodRef(mPtr); } Tcl_DeleteHashTable(oPtr->methodsPtr); ckfree(oPtr->methodsPtr); } FOREACH(variableObj, oPtr->variables) { TclDecrRefCount(variableObj); } if (i) { ckfree(oPtr->variables.list); } if (oPtr->chainCache) { TclOODeleteChainCache(oPtr->chainCache); } SquelchCachedName(oPtr); if (oPtr->metadataPtr != NULL) { Tcl_ObjectMetadataType *metadataTypePtr; ClientData value; FOREACH_HASH(metadataTypePtr, value, oPtr->metadataPtr) { metadataTypePtr->deleteProc(value); } Tcl_DeleteHashTable(oPtr->metadataPtr); ckfree(oPtr->metadataPtr); oPtr->metadataPtr = NULL; } if (clsPtr != NULL) { Class *superPtr; Tcl_ObjectMetadataType *metadataTypePtr; ClientData value; if (clsPtr->metadataPtr != NULL) { FOREACH_HASH(metadataTypePtr, value, clsPtr->metadataPtr) { metadataTypePtr->deleteProc(value); } Tcl_DeleteHashTable(clsPtr->metadataPtr); ckfree(clsPtr->metadataPtr); clsPtr->metadataPtr = NULL; } FOREACH(filterObj, clsPtr->filters) { TclDecrRefCount(filterObj); } if (i) { ckfree(clsPtr->filters.list); clsPtr->filters.num = 0; } FOREACH(mixinPtr, clsPtr->mixins) { if (!Deleted(mixinPtr->thisPtr)) { TclOORemoveFromMixinSubs(clsPtr, mixinPtr); } } if (i) { ckfree(clsPtr->mixins.list); clsPtr->mixins.num = 0; } FOREACH(superPtr, clsPtr->superclasses) { if (!Deleted(superPtr->thisPtr)) { TclOORemoveFromSubclasses(clsPtr, superPtr); } } if (i) { ckfree(clsPtr->superclasses.list); clsPtr->superclasses.num = 0; } if (clsPtr->subclasses.list) { ckfree(clsPtr->subclasses.list); clsPtr->subclasses.num = 0; } if (clsPtr->instances.list) { ckfree(clsPtr->instances.list); clsPtr->instances.num = 0; } if (clsPtr->mixinSubs.list) { ckfree(clsPtr->mixinSubs.list); clsPtr->mixinSubs.num = 0; } FOREACH_HASH_VALUE(mPtr, &clsPtr->classMethods) { TclOODelMethodRef(mPtr); } Tcl_DeleteHashTable(&clsPtr->classMethods); TclOODelMethodRef(clsPtr->constructorPtr); TclOODelMethodRef(clsPtr->destructorPtr); FOREACH(variableObj, clsPtr->variables) { TclDecrRefCount(variableObj); } if (i) { ckfree(clsPtr->variables.list); } DelRef(clsPtr); } /* * Delete the object structure itself. */ DelRef(oPtr); } /* * ---------------------------------------------------------------------- * * TclOORemoveFromInstances -- * * Utility function to remove an object from the list of instances within * a class. * * ---------------------------------------------------------------------- */ void TclOORemoveFromInstances( Object *oPtr, /* The instance to remove. */ Class *clsPtr) /* The class (possibly) containing the * reference to the instance. */ { int i; Object *instPtr; FOREACH(instPtr, clsPtr->instances) { if (oPtr == instPtr) { goto removeInstance; } } return; removeInstance: if (Deleted(clsPtr->thisPtr)) { clsPtr->instances.list[i] = NULL; } else { clsPtr->instances.num--; if (i < clsPtr->instances.num) { clsPtr->instances.list[i] = clsPtr->instances.list[clsPtr->instances.num]; } clsPtr->instances.list[clsPtr->instances.num] = NULL; } } /* * ---------------------------------------------------------------------- * * TclOOAddToInstances -- * * Utility function to add an object to the list of instances within a * class. * * ---------------------------------------------------------------------- */ void TclOOAddToInstances( Object *oPtr, /* The instance to add. */ Class *clsPtr) /* The class to add the instance to. It is * assumed that the class is not already * present as an instance in the class. */ { if (Deleted(clsPtr->thisPtr)) { return; } if (clsPtr->instances.num >= clsPtr->instances.size) { clsPtr->instances.size += ALLOC_CHUNK; if (clsPtr->instances.size == ALLOC_CHUNK) { clsPtr->instances.list = ckalloc(sizeof(Object *) * ALLOC_CHUNK); } else { clsPtr->instances.list = ckrealloc(clsPtr->instances.list, sizeof(Object *) * clsPtr->instances.size); } } clsPtr->instances.list[clsPtr->instances.num++] = oPtr; } /* * ---------------------------------------------------------------------- * * TclOORemoveFromSubclasses -- * * Utility function to remove a class from the list of subclasses within * another class. * * ---------------------------------------------------------------------- */ void TclOORemoveFromSubclasses( Class *subPtr, /* The subclass to remove. */ Class *superPtr) /* The superclass to (possibly) remove the * subclass reference from. */ { int i; Class *subclsPtr; FOREACH(subclsPtr, superPtr->subclasses) { if (subPtr == subclsPtr) { goto removeSubclass; } } return; removeSubclass: if (Deleted(superPtr->thisPtr)) { superPtr->subclasses.list[i] = NULL; } else { superPtr->subclasses.num--; if (i < superPtr->subclasses.num) { superPtr->subclasses.list[i] = superPtr->subclasses.list[superPtr->subclasses.num]; } superPtr->subclasses.list[superPtr->subclasses.num] = NULL; } } /* * ---------------------------------------------------------------------- * * TclOOAddToSubclasses -- * * Utility function to add a class to the list of subclasses within * another class. * * ---------------------------------------------------------------------- */ void TclOOAddToSubclasses( Class *subPtr, /* The subclass to add. */ Class *superPtr) /* The superclass to add the subclass to. It * is assumed that the class is not already * present as a subclass in the superclass. */ { if (Deleted(superPtr->thisPtr)) { return; } if (superPtr->subclasses.num >= superPtr->subclasses.size) { superPtr->subclasses.size += ALLOC_CHUNK; if (superPtr->subclasses.size == ALLOC_CHUNK) { superPtr->subclasses.list = ckalloc(sizeof(Class*) * ALLOC_CHUNK); } else { superPtr->subclasses.list = ckrealloc(superPtr->subclasses.list, sizeof(Class *) * superPtr->subclasses.size); } } superPtr->subclasses.list[superPtr->subclasses.num++] = subPtr; } /* * ---------------------------------------------------------------------- * * TclOORemoveFromMixinSubs -- * * Utility function to remove a class from the list of mixinSubs within * another class. * * ---------------------------------------------------------------------- */ void TclOORemoveFromMixinSubs( Class *subPtr, /* The subclass to remove. */ Class *superPtr) /* The superclass to (possibly) remove the * subclass reference from. */ { int i; Class *subclsPtr; FOREACH(subclsPtr, superPtr->mixinSubs) { if (subPtr == subclsPtr) { goto removeSubclass; } } return; removeSubclass: if (Deleted(superPtr->thisPtr)) { superPtr->mixinSubs.list[i] = NULL; } else { superPtr->mixinSubs.num--; if (i < superPtr->mixinSubs.num) { superPtr->mixinSubs.list[i] = superPtr->mixinSubs.list[superPtr->mixinSubs.num]; } superPtr->mixinSubs.list[superPtr->mixinSubs.num] = NULL; } } /* * ---------------------------------------------------------------------- * * TclOOAddToMixinSubs -- * * Utility function to add a class to the list of mixinSubs within * another class. * * ---------------------------------------------------------------------- */ void TclOOAddToMixinSubs( Class *subPtr, /* The subclass to add. */ Class *superPtr) /* The superclass to add the subclass to. It * is assumed that the class is not already * present as a subclass in the superclass. */ { if (Deleted(superPtr->thisPtr)) { return; } if (superPtr->mixinSubs.num >= superPtr->mixinSubs.size) { superPtr->mixinSubs.size += ALLOC_CHUNK; if (superPtr->mixinSubs.size == ALLOC_CHUNK) { superPtr->mixinSubs.list = ckalloc(sizeof(Class *) * ALLOC_CHUNK); } else { superPtr->mixinSubs.list = ckrealloc(superPtr->mixinSubs.list, sizeof(Class *) * superPtr->mixinSubs.size); } } superPtr->mixinSubs.list[superPtr->mixinSubs.num++] = subPtr; } /* * ---------------------------------------------------------------------- * * AllocClass -- * * Allocate a basic class. Does not splice the class object into its * class's instance list. * * ---------------------------------------------------------------------- */ static Class * AllocClass( Tcl_Interp *interp, /* Interpreter within which to allocate the * class. */ Object *useThisObj) /* Object that is to act as the class * representation, or NULL if a new object * (with automatic name) is to be used. */ { Foundation *fPtr = GetFoundation(interp); Class *clsPtr = ckalloc(sizeof(Class)); /* * Make an object if we haven't been given one. */ memset(clsPtr, 0, sizeof(Class)); if (useThisObj == NULL) { clsPtr->thisPtr = AllocObject(interp, NULL, NULL); } else { clsPtr->thisPtr = useThisObj; } /* * Configure the namespace path for the class's object. */ if (fPtr->helpersNs != NULL) { Tcl_Namespace *path[2]; path[0] = fPtr->helpersNs; path[1] = fPtr->ooNs; TclSetNsPath((Namespace *) clsPtr->thisPtr->namespacePtr, 2, path); } else { TclSetNsPath((Namespace *) clsPtr->thisPtr->namespacePtr, 1, &fPtr->ooNs); } /* * Class objects inherit from the class of classes unless they inherit * from some subclass of it. Enforce this right now. */ clsPtr->thisPtr->selfCls = fPtr->classCls; /* * Classes are subclasses of oo::object, i.e. the objects they create are * objects. */ clsPtr->superclasses.num = 1; clsPtr->superclasses.list = ckalloc(sizeof(Class *)); clsPtr->superclasses.list[0] = fPtr->objectCls; /* * Finish connecting the class structure to the object structure. */ clsPtr->thisPtr->classPtr = clsPtr; /* * That's the complicated bit. Now fill in the rest of the non-zero/NULL * fields. */ clsPtr->refCount = 1; Tcl_InitObjHashTable(&clsPtr->classMethods); return clsPtr; } /* * ---------------------------------------------------------------------- * * Tcl_NewObjectInstance -- * * Allocate a new instance of an object. * * ---------------------------------------------------------------------- */ Tcl_Object Tcl_NewObjectInstance( Tcl_Interp *interp, /* Interpreter context. */ Tcl_Class cls, /* Class to create an instance of. */ const char *nameStr, /* Name of object to create, or NULL to ask * the code to pick its own unique name. */ const char *nsNameStr, /* Name of namespace to create inside object, * or NULL to ask the code to pick its own * unique name. */ int objc, /* Number of arguments. Negative value means * do not call constructor. */ Tcl_Obj *const *objv, /* Argument list. */ int skip) /* Number of arguments to _not_ pass to the * constructor. */ { register Class *classPtr = (Class *) cls; Foundation *fPtr = GetFoundation(interp); Object *oPtr; /* * Check if we're going to create an object over an existing command; * that's not allowed. */ if (nameStr && Tcl_FindCommand(interp, nameStr, NULL, TCL_NAMESPACE_ONLY)) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "can't create object \"%s\": command already exists with" " that name", nameStr)); Tcl_SetErrorCode(interp, "TCL", "OO", "OVERWRITE_OBJECT", NULL); return NULL; } /* * Create the object. */ oPtr = AllocObject(interp, nameStr, nsNameStr); oPtr->selfCls = classPtr; TclOOAddToInstances(oPtr, classPtr); /* * Check to see if we're really creating a class. If so, allocate the * class structure as well. */ if (TclOOIsReachable(fPtr->classCls, classPtr)) { /* * Is a class, so attach a class structure. Note that the AllocClass * function splices the structure into the object, so we don't have * to. Once that's done, we need to repatch the object to have the * right class since AllocClass interferes with that. */ AllocClass(interp, oPtr); oPtr->selfCls = classPtr; TclOOAddToSubclasses(oPtr->classPtr, fPtr->objectCls); } /* * Run constructors, except when objc < 0 (a special flag case used for * object cloning only). */ if (objc >= 0) { CallContext *contextPtr = TclOOGetCallContext(oPtr, NULL, CONSTRUCTOR, NULL); if (contextPtr != NULL) { int result; Tcl_InterpState state; state = Tcl_SaveInterpState(interp, TCL_OK); contextPtr->callPtr->flags |= CONSTRUCTOR; contextPtr->skip = skip; /* * Adjust the ensmble tracking record if necessary. [Bug 3514761] */ if (((Interp*) interp)->ensembleRewrite.sourceObjs) { ((Interp*) interp)->ensembleRewrite.numInsertedObjs += skip-1; ((Interp*) interp)->ensembleRewrite.numRemovedObjs += skip-1; } result = Tcl_NRCallObjProc(interp, TclOOInvokeContext, contextPtr, objc, objv); /* * It's an error if the object was whacked in the constructor. * Force this if it isn't already an error (don't want to lose * errors by accident...) [Bug 2903011] */ if (result != TCL_ERROR && Deleted(oPtr)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "object deleted in constructor", -1)); Tcl_SetErrorCode(interp, "TCL", "OO", "STILLBORN", NULL); result = TCL_ERROR; } TclOODeleteContext(contextPtr); if (result != TCL_OK) { Tcl_DiscardInterpState(state); /* * Take care to not delete a deleted object; that would be * bad. [Bug 2903011] */ if (!Deleted(oPtr)) { Tcl_DeleteCommandFromToken(interp, oPtr->command); } return NULL; } Tcl_RestoreInterpState(interp, state); } } return (Tcl_Object) oPtr; } int TclNRNewObjectInstance( Tcl_Interp *interp, /* Interpreter context. */ Tcl_Class cls, /* Class to create an instance of. */ const char *nameStr, /* Name of object to create, or NULL to ask * the code to pick its own unique name. */ const char *nsNameStr, /* Name of namespace to create inside object, * or NULL to ask the code to pick its own * unique name. */ int objc, /* Number of arguments. Negative value means * do not call constructor. */ Tcl_Obj *const *objv, /* Argument list. */ int skip, /* Number of arguments to _not_ pass to the * constructor. */ Tcl_Object *objectPtr) /* Place to write the object reference upon * successful allocation. */ { register Class *classPtr = (Class *) cls; Foundation *fPtr = GetFoundation(interp); CallContext *contextPtr; Tcl_InterpState state; Object *oPtr; /* * Check if we're going to create an object over an existing command; * that's not allowed. */ if (nameStr && Tcl_FindCommand(interp, nameStr, NULL, TCL_NAMESPACE_ONLY)) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "can't create object \"%s\": command already exists with" " that name", nameStr)); Tcl_SetErrorCode(interp, "TCL", "OO", "OVERWRITE_OBJECT", NULL); return TCL_ERROR; } /* * Create the object. */ oPtr = AllocObject(interp, nameStr, nsNameStr); oPtr->selfCls = classPtr; TclOOAddToInstances(oPtr, classPtr); /* * Check to see if we're really creating a class. If so, allocate the * class structure as well. */ if (TclOOIsReachable(fPtr->classCls, classPtr)) { /* * Is a class, so attach a class structure. Note that the AllocClass * function splices the structure into the object, so we don't have * to. Once that's done, we need to repatch the object to have the * right class since AllocClass interferes with that. */ AllocClass(interp, oPtr); oPtr->selfCls = classPtr; TclOOAddToSubclasses(oPtr->classPtr, fPtr->objectCls); } /* * Run constructors, except when objc < 0 (a special flag case used for * object cloning only). If there aren't any constructors, we do nothing. */ if (objc < 0) { *objectPtr = (Tcl_Object) oPtr; return TCL_OK; } contextPtr = TclOOGetCallContext(oPtr, NULL, CONSTRUCTOR, NULL); if (contextPtr == NULL) { *objectPtr = (Tcl_Object) oPtr; return TCL_OK; } state = Tcl_SaveInterpState(interp, TCL_OK); contextPtr->callPtr->flags |= CONSTRUCTOR; contextPtr->skip = skip; /* * Adjust the ensmble tracking record if necessary. [Bug 3514761] */ if (((Interp *) interp)->ensembleRewrite.sourceObjs) { ((Interp *) interp)->ensembleRewrite.numInsertedObjs += skip - 1; ((Interp *) interp)->ensembleRewrite.numRemovedObjs += skip - 1; } /* * Fire off the constructors non-recursively. */ AddRef(oPtr); TclNRAddCallback(interp, FinalizeAlloc, contextPtr, oPtr, state, objectPtr); TclPushTailcallPoint(interp); return TclOOInvokeContext(contextPtr, interp, objc, objv); } static int FinalizeAlloc( ClientData data[], Tcl_Interp *interp, int result) { CallContext *contextPtr = data[0]; Object *oPtr = data[1]; Tcl_InterpState state = data[2]; Tcl_Object *objectPtr = data[3]; /* * It's an error if the object was whacked in the constructor. Force this * if it isn't already an error (don't want to lose errors by accident...) * [Bug 2903011] */ if (result != TCL_ERROR && Deleted(oPtr)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "object deleted in constructor", -1)); Tcl_SetErrorCode(interp, "TCL", "OO", "STILLBORN", NULL); result = TCL_ERROR; } TclOODeleteContext(contextPtr); if (result != TCL_OK) { Tcl_DiscardInterpState(state); /* * Take care to not delete a deleted object; that would be bad. [Bug * 2903011] */ if (!Deleted(oPtr)) { Tcl_DeleteCommandFromToken(interp, oPtr->command); } DelRef(oPtr); return TCL_ERROR; } Tcl_RestoreInterpState(interp, state); *objectPtr = (Tcl_Object) oPtr; DelRef(oPtr); return TCL_OK; } /* * ---------------------------------------------------------------------- * * Tcl_CopyObjectInstance -- * * Creates a copy of an object. Does not copy the backing namespace, * since the correct way to do that (e.g., shallow/deep) depends on the * object/class's own policies. * * ---------------------------------------------------------------------- */ Tcl_Object Tcl_CopyObjectInstance( Tcl_Interp *interp, Tcl_Object sourceObject, const char *targetName, const char *targetNamespaceName) { Object *oPtr = (Object *) sourceObject, *o2Ptr; FOREACH_HASH_DECLS; Method *mPtr; Class *mixinPtr; CallContext *contextPtr; Tcl_Obj *keyPtr, *filterObj, *variableObj, *args[3]; int i, result; /* * Sanity check. */ if (IsRootClass(oPtr)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "may not clone the class of classes", -1)); Tcl_SetErrorCode(interp, "TCL", "OO", "CLONING_CLASS", NULL); return NULL; } /* * Build the instance. Note that this does not run any constructors. */ o2Ptr = (Object *) Tcl_NewObjectInstance(interp, (Tcl_Class) oPtr->selfCls, targetName, targetNamespaceName, -1, NULL, -1); if (o2Ptr == NULL) { return NULL; } /* * Copy the object-local methods to the new object. */ if (oPtr->methodsPtr) { FOREACH_HASH(keyPtr, mPtr, oPtr->methodsPtr) { if (CloneObjectMethod(interp, o2Ptr, mPtr, keyPtr) != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } } /* * Copy the object's mixin references to the new object. */ FOREACH(mixinPtr, o2Ptr->mixins) { if (mixinPtr != o2Ptr->selfCls) { TclOORemoveFromInstances(o2Ptr, mixinPtr); } } DUPLICATE(o2Ptr->mixins, oPtr->mixins, Class *); FOREACH(mixinPtr, o2Ptr->mixins) { if (mixinPtr != o2Ptr->selfCls) { TclOOAddToInstances(o2Ptr, mixinPtr); } } /* * Copy the object's filter list to the new object. */ DUPLICATE(o2Ptr->filters, oPtr->filters, Tcl_Obj *); FOREACH(filterObj, o2Ptr->filters) { Tcl_IncrRefCount(filterObj); } /* * Copy the object's variable resolution list to the new object. */ DUPLICATE(o2Ptr->variables, oPtr->variables, Tcl_Obj *); FOREACH(variableObj, o2Ptr->variables) { Tcl_IncrRefCount(variableObj); } /* * Copy the object's flags to the new object, clearing those that must be * kept object-local. The duplicate is never deleted at this point, nor is * it the root of the object system or in the midst of processing a filter * call. */ o2Ptr->flags = oPtr->flags & ~( OBJECT_DELETED | ROOT_OBJECT | ROOT_CLASS | FILTER_HANDLING); /* * Copy the object's metadata. */ if (oPtr->metadataPtr != NULL) { Tcl_ObjectMetadataType *metadataTypePtr; ClientData value, duplicate; FOREACH_HASH(metadataTypePtr, value, oPtr->metadataPtr) { if (metadataTypePtr->cloneProc == NULL) { duplicate = value; } else { if (metadataTypePtr->cloneProc(interp, value, &duplicate) != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } if (duplicate != NULL) { Tcl_ObjectSetMetadata((Tcl_Object) o2Ptr, metadataTypePtr, duplicate); } } } /* * Copy the class, if present. Note that if there is a class present in * the source object, there must also be one in the copy. */ if (oPtr->classPtr != NULL) { Class *clsPtr = oPtr->classPtr; Class *cls2Ptr = o2Ptr->classPtr; Class *superPtr; /* * Copy the class flags across. */ cls2Ptr->flags = clsPtr->flags; /* * Ensure that the new class's superclass structure is the same as the * old class's. */ FOREACH(superPtr, cls2Ptr->superclasses) { TclOORemoveFromSubclasses(cls2Ptr, superPtr); } if (cls2Ptr->superclasses.num) { cls2Ptr->superclasses.list = ckrealloc(cls2Ptr->superclasses.list, sizeof(Class *) * clsPtr->superclasses.num); } else { cls2Ptr->superclasses.list = ckalloc(sizeof(Class *) * clsPtr->superclasses.num); } memcpy(cls2Ptr->superclasses.list, clsPtr->superclasses.list, sizeof(Class *) * clsPtr->superclasses.num); cls2Ptr->superclasses.num = clsPtr->superclasses.num; FOREACH(superPtr, cls2Ptr->superclasses) { TclOOAddToSubclasses(cls2Ptr, superPtr); } /* * Duplicate the source class's filters. */ DUPLICATE(cls2Ptr->filters, clsPtr->filters, Tcl_Obj *); FOREACH(filterObj, cls2Ptr->filters) { Tcl_IncrRefCount(filterObj); } /* * Copy the source class's variable resolution list. */ DUPLICATE(cls2Ptr->variables, clsPtr->variables, Tcl_Obj *); FOREACH(variableObj, cls2Ptr->variables) { Tcl_IncrRefCount(variableObj); } /* * Duplicate the source class's mixins (which cannot be circular * references to the duplicate). */ FOREACH(mixinPtr, cls2Ptr->mixins) { TclOORemoveFromMixinSubs(cls2Ptr, mixinPtr); } if (cls2Ptr->mixins.num != 0) { ckfree(clsPtr->mixins.list); } DUPLICATE(cls2Ptr->mixins, clsPtr->mixins, Class *); FOREACH(mixinPtr, cls2Ptr->mixins) { TclOOAddToMixinSubs(cls2Ptr, mixinPtr); } /* * Duplicate the source class's methods, constructor and destructor. */ FOREACH_HASH(keyPtr, mPtr, &clsPtr->classMethods) { if (CloneClassMethod(interp, cls2Ptr, mPtr, keyPtr, NULL) != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } if (clsPtr->constructorPtr) { if (CloneClassMethod(interp, cls2Ptr, clsPtr->constructorPtr, NULL, &cls2Ptr->constructorPtr) != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } if (clsPtr->destructorPtr) { if (CloneClassMethod(interp, cls2Ptr, clsPtr->destructorPtr, NULL, &cls2Ptr->destructorPtr) != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } /* * Duplicate the class's metadata. */ if (clsPtr->metadataPtr != NULL) { Tcl_ObjectMetadataType *metadataTypePtr; ClientData value, duplicate; FOREACH_HASH(metadataTypePtr, value, clsPtr->metadataPtr) { if (metadataTypePtr->cloneProc == NULL) { duplicate = value; } else { if (metadataTypePtr->cloneProc(interp, value, &duplicate) != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } if (duplicate != NULL) { Tcl_ClassSetMetadata((Tcl_Class) cls2Ptr, metadataTypePtr, duplicate); } } } } TclResetRewriteEnsemble(interp, 1); contextPtr = TclOOGetCallContext(o2Ptr, oPtr->fPtr->clonedName, 0, NULL); if (contextPtr) { args[0] = TclOOObjectName(interp, o2Ptr); args[1] = oPtr->fPtr->clonedName; args[2] = TclOOObjectName(interp, oPtr); Tcl_IncrRefCount(args[0]); Tcl_IncrRefCount(args[1]); Tcl_IncrRefCount(args[2]); result = Tcl_NRCallObjProc(interp, TclOOInvokeContext, contextPtr, 3, args); TclDecrRefCount(args[0]); TclDecrRefCount(args[1]); TclDecrRefCount(args[2]); TclOODeleteContext(contextPtr); if (result == TCL_ERROR) { Tcl_AddErrorInfo(interp, "\n (while performing post-copy callback)"); } if (result != TCL_OK) { Tcl_DeleteCommandFromToken(interp, o2Ptr->command); return NULL; } } return (Tcl_Object) o2Ptr; } /* * ---------------------------------------------------------------------- * * CloneObjectMethod, CloneClassMethod -- * * Helper functions used for cloning methods. They work identically to * each other, except for the difference between them in how they * register the cloned method on a successful clone. * * ---------------------------------------------------------------------- */ static int CloneObjectMethod( Tcl_Interp *interp, Object *oPtr, Method *mPtr, Tcl_Obj *namePtr) { if (mPtr->typePtr == NULL) { Tcl_NewInstanceMethod(interp, (Tcl_Object) oPtr, namePtr, mPtr->flags & PUBLIC_METHOD, NULL, NULL); } else if (mPtr->typePtr->cloneProc) { ClientData newClientData; if (mPtr->typePtr->cloneProc(interp, mPtr->clientData, &newClientData) != TCL_OK) { return TCL_ERROR; } Tcl_NewInstanceMethod(interp, (Tcl_Object) oPtr, namePtr, mPtr->flags & PUBLIC_METHOD, mPtr->typePtr, newClientData); } else { Tcl_NewInstanceMethod(interp, (Tcl_Object) oPtr, namePtr, mPtr->flags & PUBLIC_METHOD, mPtr->typePtr, mPtr->clientData); } return TCL_OK; } static int CloneClassMethod( Tcl_Interp *interp, Class *clsPtr, Method *mPtr, Tcl_Obj *namePtr, Method **m2PtrPtr) { Method *m2Ptr; if (mPtr->typePtr == NULL) { m2Ptr = (Method *) Tcl_NewMethod(interp, (Tcl_Class) clsPtr, namePtr, mPtr->flags & PUBLIC_METHOD, NULL, NULL); } else if (mPtr->typePtr->cloneProc) { ClientData newClientData; if (mPtr->typePtr->cloneProc(interp, mPtr->clientData, &newClientData) != TCL_OK) { return TCL_ERROR; } m2Ptr = (Method *) Tcl_NewMethod(interp, (Tcl_Class) clsPtr, namePtr, mPtr->flags & PUBLIC_METHOD, mPtr->typePtr, newClientData); } else { m2Ptr = (Method *) Tcl_NewMethod(interp, (Tcl_Class) clsPtr, namePtr, mPtr->flags & PUBLIC_METHOD, mPtr->typePtr, mPtr->clientData); } if (m2PtrPtr != NULL) { *m2PtrPtr = m2Ptr; } return TCL_OK; } /* * ---------------------------------------------------------------------- * * Tcl_ClassGetMetadata, Tcl_ClassSetMetadata, Tcl_ObjectGetMetadata, * Tcl_ObjectSetMetadata -- * * Metadata management API. The metadata system allows code in extensions * to attach arbitrary non-NULL pointers to objects and classes without * the different things that might be interested being able to interfere * with each other. Apart from non-NULL-ness, these routines attach no * interpretation to the meaning of the metadata pointers. * * The Tcl_*GetMetadata routines get the metadata pointer attached that * has been related with a particular type, or NULL if no metadata * associated with the given type has been attached. * * The Tcl_*SetMetadata routines set or delete the metadata pointer that * is related to a particular type. The value associated with the type is * deleted (if present; no-op otherwise) if the value is NULL, and * attached (replacing the previous value, which is deleted if present) * otherwise. This means it is impossible to attach a NULL value for any * metadata type. * * ---------------------------------------------------------------------- */ ClientData Tcl_ClassGetMetadata( Tcl_Class clazz, const Tcl_ObjectMetadataType *typePtr) { Class *clsPtr = (Class *) clazz; Tcl_HashEntry *hPtr; /* * If there's no metadata store attached, the type in question has * definitely not been attached either! */ if (clsPtr->metadataPtr == NULL) { return NULL; } /* * There is a metadata store, so look in it for the given type. */ hPtr = Tcl_FindHashEntry(clsPtr->metadataPtr, (char *) typePtr); /* * Return the metadata value if we found it, otherwise NULL. */ if (hPtr == NULL) { return NULL; } return Tcl_GetHashValue(hPtr); } void Tcl_ClassSetMetadata( Tcl_Class clazz, const Tcl_ObjectMetadataType *typePtr, ClientData metadata) { Class *clsPtr = (Class *) clazz; Tcl_HashEntry *hPtr; int isNew; /* * Attach the metadata store if not done already. */ if (clsPtr->metadataPtr == NULL) { if (metadata == NULL) { return; } clsPtr->metadataPtr = ckalloc(sizeof(Tcl_HashTable)); Tcl_InitHashTable(clsPtr->metadataPtr, TCL_ONE_WORD_KEYS); } /* * If the metadata is NULL, we're deleting the metadata for the type. */ if (metadata == NULL) { hPtr = Tcl_FindHashEntry(clsPtr->metadataPtr, (char *) typePtr); if (hPtr != NULL) { typePtr->deleteProc(Tcl_GetHashValue(hPtr)); Tcl_DeleteHashEntry(hPtr); } return; } /* * Otherwise we're attaching the metadata. Note that if there was already * some metadata attached of this type, we delete that first. */ hPtr = Tcl_CreateHashEntry(clsPtr->metadataPtr, (char *) typePtr, &isNew); if (!isNew) { typePtr->deleteProc(Tcl_GetHashValue(hPtr)); } Tcl_SetHashValue(hPtr, metadata); } ClientData Tcl_ObjectGetMetadata( Tcl_Object object, const Tcl_ObjectMetadataType *typePtr) { Object *oPtr = (Object *) object; Tcl_HashEntry *hPtr; /* * If there's no metadata store attached, the type in question has * definitely not been attached either! */ if (oPtr->metadataPtr == NULL) { return NULL; } /* * There is a metadata store, so look in it for the given type. */ hPtr = Tcl_FindHashEntry(oPtr->metadataPtr, (char *) typePtr); /* * Return the metadata value if we found it, otherwise NULL. */ if (hPtr == NULL) { return NULL; } return Tcl_GetHashValue(hPtr); } void Tcl_ObjectSetMetadata( Tcl_Object object, const Tcl_ObjectMetadataType *typePtr, ClientData metadata) { Object *oPtr = (Object *) object; Tcl_HashEntry *hPtr; int isNew; /* * Attach the metadata store if not done already. */ if (oPtr->metadataPtr == NULL) { if (metadata == NULL) { return; } oPtr->metadataPtr = ckalloc(sizeof(Tcl_HashTable)); Tcl_InitHashTable(oPtr->metadataPtr, TCL_ONE_WORD_KEYS); } /* * If the metadata is NULL, we're deleting the metadata for the type. */ if (metadata == NULL) { hPtr = Tcl_FindHashEntry(oPtr->metadataPtr, (char *) typePtr); if (hPtr != NULL) { typePtr->deleteProc(Tcl_GetHashValue(hPtr)); Tcl_DeleteHashEntry(hPtr); } return; } /* * Otherwise we're attaching the metadata. Note that if there was already * some metadata attached of this type, we delete that first. */ hPtr = Tcl_CreateHashEntry(oPtr->metadataPtr, (char *) typePtr, &isNew); if (!isNew) { typePtr->deleteProc(Tcl_GetHashValue(hPtr)); } Tcl_SetHashValue(hPtr, metadata); } /* * ---------------------------------------------------------------------- * * PublicObjectCmd, PrivateObjectCmd, TclOOInvokeObject -- * * Main entry point for object invokations. The Public* and Private* * wrapper functions (implementations of both object instance commands * and [my]) are just thin wrappers round the main TclOOObjectCmdCore * function. Note that the core is function is NRE-aware. * * ---------------------------------------------------------------------- */ static int PublicObjectCmd( ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv) { return Tcl_NRCallObjProc(interp, PublicNRObjectCmd, clientData,objc,objv); } static int PublicNRObjectCmd( ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv) { return TclOOObjectCmdCore(clientData, interp, objc, objv, PUBLIC_METHOD, NULL); } static int PrivateObjectCmd( ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv) { return Tcl_NRCallObjProc(interp, PrivateNRObjectCmd,clientData,objc,objv); } static int PrivateNRObjectCmd( ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const *objv) { return TclOOObjectCmdCore(clientData, interp, objc, objv, 0, NULL); } int TclOOInvokeObject( Tcl_Interp *interp, /* Interpreter for commands, variables, * results, error reporting, etc. */ Tcl_Object object, /* The object to invoke. */ Tcl_Class startCls, /* Where in the class chain to start the * invoke from, or NULL to traverse the whole * chain including filters. */ int publicPrivate, /* Whether this is an invoke from a public * context (PUBLIC_METHOD), a private context * (PRIVATE_METHOD), or a *really* private * context (any other value; conventionally * 0). */ int objc, /* Number of arguments. */ Tcl_Obj *const *objv) /* Array of argument objects. It is assumed * that the name of the method to invoke will * be at index 1. */ { switch (publicPrivate) { case PUBLIC_METHOD: return TclOOObjectCmdCore((Object *) object, interp, objc, objv, PUBLIC_METHOD, (Class *) startCls); case PRIVATE_METHOD: return TclOOObjectCmdCore((Object *) object, interp, objc, objv, PRIVATE_METHOD, (Class *) startCls); default: return TclOOObjectCmdCore((Object *) object, interp, objc, objv, 0, (Class *) startCls); } } /* * ---------------------------------------------------------------------- * * TclOOObjectCmdCore, FinalizeObjectCall -- * * Main function for object invokations. Does call chain creation, * management and invokation. The function FinalizeObjectCall exists to * clean up after the non-recursive processing of TclOOObjectCmdCore. * * ---------------------------------------------------------------------- */ int TclOOObjectCmdCore( Object *oPtr, /* The object being invoked. */ Tcl_Interp *interp, /* The interpreter containing the object. */ int objc, /* How many arguments are being passed in. */ Tcl_Obj *const *objv, /* The array of arguments. */ int flags, /* Whether this is an invokation through the * public or the private command interface. */ Class *startCls) /* Where to start in the call chain, or NULL * if we are to start at the front with * filters and the object's methods (which is * the normal case). */ { CallContext *contextPtr; Tcl_Obj *methodNamePtr; int result; /* * If we've no method name, throw this directly into the unknown * processing. */ if (objc < 2) { flags |= FORCE_UNKNOWN; methodNamePtr = NULL; goto noMapping; } /* * Give plugged in code a chance to remap the method name. */ methodNamePtr = objv[1]; if (oPtr->mapMethodNameProc != NULL) { register Class **startClsPtr = &startCls; Tcl_Obj *mappedMethodName = Tcl_DuplicateObj(methodNamePtr); result = oPtr->mapMethodNameProc(interp, (Tcl_Object) oPtr, (Tcl_Class *) startClsPtr, mappedMethodName); if (result != TCL_OK) { TclDecrRefCount(mappedMethodName); if (result == TCL_BREAK) { goto noMapping; } else if (result == TCL_ERROR) { Tcl_AddErrorInfo(interp, "\n (while mapping method name)"); } return result; } /* * Get the call chain for the remapped name. */ Tcl_IncrRefCount(mappedMethodName); contextPtr = TclOOGetCallContext(oPtr, mappedMethodName, flags | (oPtr->flags & FILTER_HANDLING), methodNamePtr); TclDecrRefCount(mappedMethodName); if (contextPtr == NULL) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "impossible to invoke method \"%s\": no defined method or" " unknown method", TclGetString(methodNamePtr))); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD_MAPPED", TclGetString(methodNamePtr), NULL); return TCL_ERROR; } } else { /* * Get the call chain. */ noMapping: contextPtr = TclOOGetCallContext(oPtr, methodNamePtr, flags | (oPtr->flags & FILTER_HANDLING), NULL); if (contextPtr == NULL) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "impossible to invoke method \"%s\": no defined method or" " unknown method", TclGetString(methodNamePtr))); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD", TclGetString(methodNamePtr), NULL); return TCL_ERROR; } } /* * Check to see if we need to apply magical tricks to start part way * through the call chain. */ if (startCls != NULL) { for (; contextPtr->index < contextPtr->callPtr->numChain; contextPtr->index++) { register struct MInvoke *miPtr = &contextPtr->callPtr->chain[contextPtr->index]; if (miPtr->isFilter) { continue; } if (miPtr->mPtr->declaringClassPtr == startCls) { break; } } if (contextPtr->index >= contextPtr->callPtr->numChain) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "no valid method implementation", -1)); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD", TclGetString(methodNamePtr), NULL); TclOODeleteContext(contextPtr); return TCL_ERROR; } } /* * Invoke the call chain, locking the object structure against deletion * for the duration. */ TclNRAddCallback(interp, FinalizeObjectCall, contextPtr, NULL,NULL,NULL); return TclOOInvokeContext(contextPtr, interp, objc, objv); } static int FinalizeObjectCall( ClientData data[], Tcl_Interp *interp, int result) { /* * Dispose of the call chain, which drops the lock on the object's * structure. */ TclOODeleteContext(data[0]); return result; } /* * ---------------------------------------------------------------------- * * Tcl_ObjectContextInvokeNext, TclNRObjectContextInvokeNext, FinalizeNext -- * * Invokes the next stage of the call chain described in an object * context. This is the core of the implementation of the [next] command. * Does not do management of the call-frame stack. Available in public * (standard API) and private (NRE-aware) forms. FinalizeNext is a * private function used to clean up in the NRE case. * * ---------------------------------------------------------------------- */ int Tcl_ObjectContextInvokeNext( Tcl_Interp *interp, Tcl_ObjectContext context, int objc, Tcl_Obj *const *objv, int skip) { CallContext *contextPtr = (CallContext *) context; int savedIndex = contextPtr->index; int savedSkip = contextPtr->skip; int result; if (contextPtr->index+1 >= contextPtr->callPtr->numChain) { /* * We're at the end of the chain; generate an error message unless the * interpreter is being torn down, in which case we might be getting * here because of methods/destructors doing a [next] (or equivalent) * unexpectedly. */ const char *methodType; if (Tcl_InterpDeleted(interp)) { return TCL_OK; } if (contextPtr->callPtr->flags & CONSTRUCTOR) { methodType = "constructor"; } else if (contextPtr->callPtr->flags & DESTRUCTOR) { methodType = "destructor"; } else { methodType = "method"; } Tcl_SetObjResult(interp, Tcl_ObjPrintf( "no next %s implementation", methodType)); Tcl_SetErrorCode(interp, "TCL", "OO", "NOTHING_NEXT", NULL); return TCL_ERROR; } /* * Advance to the next method implementation in the chain in the method * call context while we process the body. However, need to adjust the * argument-skip control because we're guaranteed to have a single prefix * arg (i.e., 'next') and not the variable amount that can happen because * method invokations (i.e., '$obj meth' and 'my meth'), constructors * (i.e., '$cls new' and '$cls create obj') and destructors (no args at * all) come through the same code. */ contextPtr->index++; contextPtr->skip = skip; /* * Invoke the (advanced) method call context in the caller context. */ result = Tcl_NRCallObjProc(interp, TclOOInvokeContext, contextPtr, objc, objv); /* * Restore the call chain context index as we've finished the inner invoke * and want to operate in the outer context again. */ contextPtr->index = savedIndex; contextPtr->skip = savedSkip; return result; } int TclNRObjectContextInvokeNext( Tcl_Interp *interp, Tcl_ObjectContext context, int objc, Tcl_Obj *const *objv, int skip) { register CallContext *contextPtr = (CallContext *) context; if (contextPtr->index+1 >= contextPtr->callPtr->numChain) { /* * We're at the end of the chain; generate an error message unless the * interpreter is being torn down, in which case we might be getting * here because of methods/destructors doing a [next] (or equivalent) * unexpectedly. */ const char *methodType; if (Tcl_InterpDeleted(interp)) { return TCL_OK; } if (contextPtr->callPtr->flags & CONSTRUCTOR) { methodType = "constructor"; } else if (contextPtr->callPtr->flags & DESTRUCTOR) { methodType = "destructor"; } else { methodType = "method"; } Tcl_SetObjResult(interp, Tcl_ObjPrintf( "no next %s implementation", methodType)); Tcl_SetErrorCode(interp, "TCL", "OO", "NOTHING_NEXT", NULL); return TCL_ERROR; } /* * Advance to the next method implementation in the chain in the method * call context while we process the body. However, need to adjust the * argument-skip control because we're guaranteed to have a single prefix * arg (i.e., 'next') and not the variable amount that can happen because * method invokations (i.e., '$obj meth' and 'my meth'), constructors * (i.e., '$cls new' and '$cls create obj') and destructors (no args at * all) come through the same code. */ TclNRAddCallback(interp, FinalizeNext, contextPtr, INT2PTR(contextPtr->index), INT2PTR(contextPtr->skip), NULL); contextPtr->index++; contextPtr->skip = skip; /* * Invoke the (advanced) method call context in the caller context. */ return TclOOInvokeContext(contextPtr, interp, objc, objv); } static int FinalizeNext( ClientData data[], Tcl_Interp *interp, int result) { CallContext *contextPtr = data[0]; /* * Restore the call chain context index as we've finished the inner invoke * and want to operate in the outer context again. */ contextPtr->index = PTR2INT(data[1]); contextPtr->skip = PTR2INT(data[2]); return result; } /* * ---------------------------------------------------------------------- * * Tcl_GetObjectFromObj -- * * Utility function to get an object from a Tcl_Obj containing its name. * * ---------------------------------------------------------------------- */ Tcl_Object Tcl_GetObjectFromObj( Tcl_Interp *interp, /* Interpreter in which to locate the object. * Will have an error message placed in it if * the name does not refer to an object. */ Tcl_Obj *objPtr) /* The name of the object to look up, which is * exactly the name of its public command. */ { Command *cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, objPtr); if (cmdPtr == NULL) { goto notAnObject; } if (cmdPtr->objProc != PublicObjectCmd) { cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr); if (cmdPtr == NULL || cmdPtr->objProc != PublicObjectCmd) { goto notAnObject; } } return cmdPtr->objClientData; notAnObject: Tcl_SetObjResult(interp, Tcl_ObjPrintf( "%s does not refer to an object", TclGetString(objPtr))); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "OBJECT", TclGetString(objPtr), NULL); return NULL; } /* * ---------------------------------------------------------------------- * * TclOOIsReachable -- * * Utility function that tests whether a class is a subclass (whether * directly or indirectly) of another class. * * ---------------------------------------------------------------------- */ int TclOOIsReachable( Class *targetPtr, Class *startPtr) { int i; Class *superPtr; tailRecurse: if (startPtr == targetPtr) { return 1; } if (startPtr->superclasses.num == 1 && startPtr->mixins.num == 0) { startPtr = startPtr->superclasses.list[0]; goto tailRecurse; } FOREACH(superPtr, startPtr->superclasses) { if (TclOOIsReachable(targetPtr, superPtr)) { return 1; } } FOREACH(superPtr, startPtr->mixins) { if (TclOOIsReachable(targetPtr, superPtr)) { return 1; } } return 0; } /* * ---------------------------------------------------------------------- * * TclOOObjectName, Tcl_GetObjectName -- * * Utility function that returns the name of the object. Note that this * simplifies cache management by keeping the code to do it in one place * and not sprayed all over. The value returned always has a reference * count of at least one. * * ---------------------------------------------------------------------- */ Tcl_Obj * TclOOObjectName( Tcl_Interp *interp, Object *oPtr) { Tcl_Obj *namePtr; if (oPtr->cachedNameObj) { return oPtr->cachedNameObj; } namePtr = Tcl_NewObj(); Tcl_GetCommandFullName(interp, oPtr->command, namePtr); Tcl_IncrRefCount(namePtr); oPtr->cachedNameObj = namePtr; return namePtr; } Tcl_Obj * Tcl_GetObjectName( Tcl_Interp *interp, Tcl_Object object) { return TclOOObjectName(interp, (Object *) object); } /* * ---------------------------------------------------------------------- * * assorted trivial 'getter' functions * * ---------------------------------------------------------------------- */ Tcl_Method Tcl_ObjectContextMethod( Tcl_ObjectContext context) { CallContext *contextPtr = (CallContext *) context; return (Tcl_Method) contextPtr->callPtr->chain[contextPtr->index].mPtr; } int Tcl_ObjectContextIsFiltering( Tcl_ObjectContext context) { CallContext *contextPtr = (CallContext *) context; return contextPtr->callPtr->chain[contextPtr->index].isFilter; } Tcl_Object Tcl_ObjectContextObject( Tcl_ObjectContext context) { return (Tcl_Object) ((CallContext *)context)->oPtr; } int Tcl_ObjectContextSkippedArgs( Tcl_ObjectContext context) { return ((CallContext *)context)->skip; } Tcl_Namespace * Tcl_GetObjectNamespace( Tcl_Object object) { return ((Object *)object)->namespacePtr; } Tcl_Command Tcl_GetObjectCommand( Tcl_Object object) { return ((Object *)object)->command; } Tcl_Class Tcl_GetObjectAsClass( Tcl_Object object) { return (Tcl_Class) ((Object *)object)->classPtr; } int Tcl_ObjectDeleted( Tcl_Object object) { return Deleted(object) ? 1 : 0; } Tcl_Object Tcl_GetClassAsObject( Tcl_Class clazz) { return (Tcl_Object) ((Class *)clazz)->thisPtr; } Tcl_ObjectMapMethodNameProc * Tcl_ObjectGetMethodNameMapper( Tcl_Object object) { return ((Object *) object)->mapMethodNameProc; } void Tcl_ObjectSetMethodNameMapper( Tcl_Object object, Tcl_ObjectMapMethodNameProc *mapMethodNameProc) { ((Object *) object)->mapMethodNameProc = mapMethodNameProc; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */