Tcl Source Code

    if (oldRefPtr != NULL) {
	cmdPtr->importRefPtr = oldRefPtr;
	while (oldRefPtr != NULL) {
	    Command *refCmdPtr = oldRefPtr->importedCmdPtr;

	    dataPtr = (ImportedCmdData*)refCmdPtr->objClientData;
	    cmdPtr->refCount++;
	    TclCleanupCommandMacro(dataPtr->realCmdPtr);
	    dataPtr->realCmdPtr = cmdPtr;
	    oldRefPtr = oldRefPtr->nextPtr;
	}
    }

    /*
     * We just created a command, so in its namespace and all of its parent

    char *name;

    /*
     * Add the full name of the containing namespace, followed by the "::"
     * separator, and the command name.
     */

    if ((cmdPtr != NULL) && TclRoutineHasName(cmdPtr)) {
	if (cmdPtr->nsPtr != NULL) {
	    Tcl_AppendToObj(objPtr, cmdPtr->nsPtr->fullName, -1);
	    if (cmdPtr->nsPtr != iPtr->globalNsPtr) {
		Tcl_AppendToObj(objPtr, "::", 2);
	    }
	}
	if (cmdPtr->hPtr != NULL) {

     * invoking the deletion callback because there are cases where the
     * deletion callback needs to invoke the command (e.g. object systems such
     * as OTcl). However, this means that the callback could try to delete or
     * rename the command. The deleted flag allows us to detect these cases
     * and skip nested deletes.
     */

    if (cmdPtr->flags & CMD_DYING) {
	/*
	 * Another deletion is already in progress. Remove the hash table
	 * entry now, but don't invoke a callback or free the command
	 * structure. Take care to only remove the hash entry if it has not
	 * already been removed; otherwise if we manage to hit this function
	 * three times, everything goes up in smoke. [Bug 1220058]
	 */

     * We must delete this command, even though both traces and delete procs
     * may try to avoid this (renaming the command etc). Also traces and
     * delete procs may try to delete the command themselves. This flag
     * declares that a delete is in progress and that recursive deletes should
     * be ignored.
     */

    cmdPtr->flags |= CMD_DYING;

    /*
     * Call trace functions for the command being deleted. Then delete its
     * traces.
     */

    cmdPtr->nsPtr->refCount++;

	    }
	    tracePtr = nextPtr;
	}
	cmdPtr->tracePtr = NULL;
    }

    /*
     * The list of commands exported from the namespace might have changed.
     * However, we do not need to recompute this just yet; next time we need
     * the info will be soon enough.
     */

    TclInvalidateNsCmdLookup(cmdPtr->nsPtr);
    TclNsDecrRefCount(cmdPtr->nsPtr);

    Tcl_InterpState state = NULL;

    if (cmdPtr->flags & CMD_TRACE_ACTIVE) {
	/*
	 * While a rename trace is active, we will not process any more rename
	 * traces; while a delete trace is active we will never reach here -
	 * because Tcl_DeleteCommandFromToken checks for the condition
	 * (cmdPtr->flags & CMD_DYING) and returns immediately when a
	 * command deletion is in progress. For all other traces, delete
	 * traces will not be invoked but a call to TraceCommandProc will
	 * ensure that tracePtr->clientData is freed whenever the command
	 * "oldName" is deleted.
	 */

	if (cmdPtr->flags & TCL_TRACE_RENAME) {

    int objc = PTR2INT(data[0]);
    Tcl_Obj *commandPtr = (Tcl_Obj *)data[1];
    Command *cmdPtr = (Command *)data[2];
    Tcl_Obj **objv = (Tcl_Obj **)data[3];
    int length;
    const char *command = TclGetStringFromObj(commandPtr, &length);

    if (!(cmdPtr->flags & CMD_DYING)) {
	if (cmdPtr->flags & CMD_HAS_EXEC_TRACES) {
	    traceCode = TclCheckExecutionTraces(interp, command, length,
		    cmdPtr, result, TCL_TRACE_LEAVE_EXEC, objc, objv);
	}
	if (iPtr->tracePtr != NULL && traceCode == TCL_OK) {
	    traceCode = TclCheckInterpTraces(interp, command, length,
		    cmdPtr, result, TCL_TRACE_LEAVE_EXEC, objc, objv);

	 * This also preserves any associations between list elements and
	 * location information for such elements.
	 */

	/*
	 * Shimmer protection! Always pass an unshared obj. The caller could
	 * incr the refCount of objPtr AFTER calling us! To be completely safe
	 * we always make a copy. The callback takes care of the refCounts for
	 * both listPtr and objPtr.
	 *
	 * TODO: Create a test to demo this need, or eliminate it.
	 * FIXME OPT: preserve just the internal rep?
	 */

	Tcl_IncrRefCount(objPtr);

	return result;
    }

    NRE_ASSERT(COR_IS_SUSPENDED(corPtr));
    SAVE_CONTEXT(corPtr->running);
    RESTORE_CONTEXT(corPtr->caller);

    if (cmdPtr->flags & CMD_DYING) {
	/*
	 * The command was deleted while it was running: wind down the
	 * execEnv, this will do the complete cleanup. RewindCoroutine will
	 * restore both the caller's context and interp state.
	 */

	return RewindCoroutine(corPtr, result);

    CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

    if (corPtr && !(corPtr->cmdPtr->flags & CMD_DYING)) {
	Tcl_Obj *namePtr;

	TclNewObj(namePtr);
	Tcl_GetCommandFullName(interp, (Tcl_Command) corPtr->cmdPtr, namePtr);
	Tcl_SetObjResult(interp, namePtr);
    }
    return TCL_OK;

    if ((cmdPtr != NULL) && (cmdPtr->flags & CMD_VIA_RESOLVER)) {
	extraLiteralFlags |= LITERAL_UNSHARED;
    }

    bytes = TclGetStringFromObj(cmdObj, &numBytes);
    cmdLitIdx = TclRegisterLiteral(envPtr, bytes, numBytes, extraLiteralFlags);

    if (cmdPtr && TclRoutineHasName(cmdPtr)) {
	TclSetCmdNameObj(interp, TclFetchLiteral(envPtr, cmdLitIdx), cmdPtr);
    }
    TclEmitPush(cmdLitIdx, envPtr);
}

void
TclCompileInvocation(

	    goto cleanup;
	}
	ensemble = (Tcl_Command) cmdPtr;
	goto checkNextWord;
    }

    /*
     * Now that the mapping process is done we actually try to compile.
     * If there is a subcommand compiler and that successfully produces code,
     * we'll use that. Otherwise, we fall back to generating opcodes to do the
     * invoke at runtime.
     */

    invokeAnyway = 1;
    if (TCL_OK == TclAttemptCompileProc(interp, parsePtr, depth, cmdPtr,

    if (cmdPtr->compileProc == NULL) {
	return TCL_ERROR;
    }

    /*
     * Advance parsePtr->tokenPtr so that it points at the last subcommand.
     * This will be wrong but it will not matter, and it will put the
     * tokens for the arguments in the right place without the need to
     * allocate a synthetic Tcl_Parse struct or copy tokens around.
     */

    for (i = 0; i < depth - 1; i++) {
	parsePtr->tokenPtr = TokenAfter(parsePtr->tokenPtr);
    }
    parsePtr->numWords -= (depth - 1);

	NEXT_INST_F(1, 0, 1);
    }
    break;
    case INST_COROUTINE_NAME: {
	CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;

	TclNewObj(objResultPtr);
	if (corPtr && !(corPtr->cmdPtr->flags & CMD_DYING)) {
	    Tcl_GetCommandFullName(interp, (Tcl_Command) corPtr->cmdPtr,
		    objResultPtr);
	}
	TRACE_WITH_OBJ(("=> "), objResultPtr);
	NEXT_INST_F(1, 0, 1);
    }
    break;

	TRACE_WITH_OBJ(("\"%.20s\" => ", O2S(OBJ_AT_TOS)), objResultPtr);
	NEXT_INST_F(1, 1, 1);

    case INST_ORIGIN_COMMAND:
	TRACE(("\"%.30s\" => ", O2S(OBJ_AT_TOS)));
	cmd = Tcl_GetCommandFromObj(interp, OBJ_AT_TOS);
	if (cmd == NULL) {
	    goto instOriginError;
	}
	origCmd = TclGetOriginalCommand(cmd);
	if (origCmd == NULL) {
	    origCmd = cmd;
	} 

	TclNewObj(objResultPtr);
	Tcl_GetCommandFullName(interp, origCmd, objResultPtr);
	if (TclCheckEmptyString(objResultPtr) == TCL_EMPTYSTRING_YES ) {
	    Tcl_DecrRefCount(objResultPtr);
	    instOriginError:
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "invalid command name \"%s\"", TclGetString(OBJ_AT_TOS)));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND",
		    TclGetString(OBJ_AT_TOS), NULL);
	    CACHE_STACK_INFO();
	    TRACE_APPEND(("ERROR: not command\n"));
	    goto gotError;
	}






	TRACE_APPEND(("\"%.30s\"", O2S(OBJ_AT_TOS)));
	NEXT_INST_F(1, 1, 1);
    }

    /*
     * -----------------------------------------------------------------
     *	   Start of TclOO support instructions.

				 * command. */
    Tcl_ObjCmdProc *nreProc;	/* NRE implementation of this command. */
} Command;

/*
 * Flag bits for commands.
 *
 * CMD_DYING -			If 1 the command is in the process of
 *				being deleted (its deleteProc is currently
 *				executing). Other attempts to delete the
 *				command should be ignored.
 * CMD_TRACE_ACTIVE -		If 1 the trace processing is currently
 *				underway for a rename/delete change. See the
 *				two flags below for which is currently being
 *				processed.
 * CMD_HAS_EXEC_TRACES -	If 1 means that this command has at least one
 *				execution trace (as opposed to simple
 *				delete/rename traces) in its tracePtr list.
 * CMD_COMPILES_EXPANDED -	If 1 this command has a compiler that
 *				can handle expansion (provided it is not the
 *				first word).
 * TCL_TRACE_RENAME -		A rename trace is in progress. Further
 *				recursive renames will not be traced.
 * TCL_TRACE_DELETE -		A delete trace is in progress. Further
 *				recursive deletes will not be traced.
 * (these last two flags are defined in tcl.h)
 */

#define CMD_DYING		    0x01
#define CMD_TRACE_ACTIVE	    0x02
#define CMD_HAS_EXEC_TRACES	    0x04
#define CMD_COMPILES_EXPANDED	    0x08
#define CMD_REDEF_IN_PROGRESS	    0x10
#define CMD_VIA_RESOLVER	    0x20
#define CMD_DEAD                    0x40

/*
 *----------------------------------------------------------------
 * Inline version of TclCleanupCommand; still need the function as it is in
 * the internal stubs, but the core can use the macro instead.
 */

#define TclCleanupCommandMacro(cmdPtr)		\
    do {					\
	if ((cmdPtr)->refCount-- <= 1) {	\
	    ckfree(cmdPtr);			\
	}					\
    } while (0)


/*
 * inside this routine crement refCount first incase cmdPtr is replacing itself
 */
#define TclRoutineAssign(location, cmdPtr)	    \
    do {					    \
	(cmdPtr)->refCount++;			    \
	if ((location) != NULL			    \
	    && (location--) <= 1) {		    \
	    ckfree(((location)));		    \
	}					    \
	(location) = (cmdPtr);			    \
    } while (0)
    

#define TclRoutineHasName(cmdPtr) \
    (cmdPtr)->hPtr != NULL

/*
 *----------------------------------------------------------------
 * Inline versions of Tcl_LimitReady() and Tcl_LimitExceeded to limit number
 * of calls out of the critical path. Note that this code isn't particularly
 * readable; the non-inline version (in tclInterp.c) is much easier to
 * understand. Note also that these macros takes different args (iPtr->limit)

	}

	dataPtr = (ImportedCmdData *)ckalloc(sizeof(ImportedCmdData));
	importedCmd = Tcl_NRCreateCommand(interp, Tcl_DStringValue(&ds),
		TclInvokeImportedCmd, InvokeImportedNRCmd, dataPtr,
		DeleteImportedCmd);
	dataPtr->realCmdPtr = cmdPtr;
	/* corresponding decrement is in DeleteImportedCmd */ 
	cmdPtr->refCount++;
	dataPtr->selfPtr = (Command *) importedCmd;
	dataPtr->selfPtr->compileProc = cmdPtr->compileProc;
	Tcl_DStringFree(&ds);

	/*
	 * Create an ImportRef structure describing this new import command
	 * and add it to the import ref list in the "real" command.

	    if (prevPtr == NULL) { /* refPtr is first in list. */
		realCmdPtr->importRefPtr = refPtr->nextPtr;
	    } else {
		prevPtr->nextPtr = refPtr->nextPtr;
	    }
	    ckfree(refPtr);
	    TclCleanupCommandMacro(realCmdPtr);
	    ckfree(dataPtr);
	    return;
	}
	prevPtr = refPtr;
    }

    Tcl_Panic("DeleteImportedCmd: did not find cmd in real cmd's list of import references");

static int
NamespaceOriginCmd(
    TCL_UNUSED(ClientData),
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Command cmd, origCmd;
    Tcl_Obj *resultPtr;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "name");
	return TCL_ERROR;
    }

    cmd = Tcl_GetCommandFromObj(interp, objv[1]);
    if (cmd == NULL) {
	goto namespaceOriginError;
    }
    origCmd = TclGetOriginalCommand(cmd);
    if (origCmd == NULL) {
	origCmd = cmd;
    } 
    TclNewObj(resultPtr);
    Tcl_GetCommandFullName(interp, origCmd, resultPtr);
    if (TclCheckEmptyString(resultPtr) == TCL_EMPTYSTRING_YES ) {
	Tcl_DecrRefCount(resultPtr);
	namespaceOriginError:
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "invalid command name \"%s\"", TclGetString(objv[1])));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND",
		TclGetString(objv[1]), NULL);
	return TCL_ERROR;
    }













    Tcl_SetObjResult(interp, resultPtr);
    return TCL_OK;
}


/*
 *----------------------------------------------------------------------
 *
 * NamespaceParentCmd --
 *
 *	Invoked to implement the "namespace parent" command that returns the

    /*
     * Instruct everyone to no longer use any allocated fields of the object.
     * Also delete the command that refers to the object at this point (if it
     * still exists) because otherwise its pointer to the object points into
     * freed memory.
     */

    if (((Command *) oPtr->command)->flags && CMD_DYING) {
	/*
	 * Something has already started the command deletion process. We can
	 * go ahead and clean up the the namespace,
	 */
    } else {
	/*
	 * The namespace must have been deleted directly.  Delete the command

	    Tcl_FindCommand(interp, name, /*ns*/ NULL, /*flags*/ 0);

    /*
     * Stop shimmering and caching nothing when we found nothing.  Just
     * report the failure to find the command as an error.
     */

    if (cmdPtr == NULL || !TclRoutineHasName(cmdPtr)) {
	return TCL_ERROR;
    }

    resPtr = (ResolvedCmdName *)objPtr->internalRep.twoPtrValue.ptr1;
    if ((objPtr->typePtr == &tclCmdNameType) && (resPtr->refCount == 1)) {
	/*
	 * Re-use existing ResolvedCmdName struct when possible.

    namespace eval src {namespace export foo; proc foo {} {}}
    namespace eval dst {namespace import [namespace parent]::src::foo}
    trace add command src::foo delete \
        "[list namespace delete [namespace current]::dst] ;#"
    proc src::foo {} {}
    namespace delete src
} {}


test namespace-13.3 {
    deleting origin of import in trace on deletion of import
} -setup {
    namespace eval ns0 {
	namespace export *
	variable res {}

	proc traced {oldname newname op} {
		variable res

		lappend res {Is oldname the name of the imported routine?}
		set expected [namespace qualifiers [namespace current]::fake]::ns2::ns1
		if {$oldname eq $expected} {
		    lappend res 1
		} else {
		    lappend res 0
		}

		lappend res {[namespace which] finds the old name}
		set which [namespace which $oldname]
		if {$which eq $expected} {
		    lappend res 1
		} else {
		    lappend res $which
		}

		lappend res {Is origin name correct}
		catch {
		    namespace origin $oldname
		} cres copts
		set expected [namespace qualifiers [namespace current]::fake]::ns1
		if {$cres eq $expected} {
		    lappend res 1
		} else {
		    lappend res $cres
		}

		set origin $cres
		rename $origin {}

		lappend res {After deletion of the origin is it an error to ask for the origin (compiled)?}
		set status [catch {
		    namespace origin $oldname
		} cres copts]
		if {$status && [string match {invalid command name "*::ns2::ns1"} $cres]} {
		    lappend res 1
		} else {
		    lappend res $cres
		}

		lappend res {After deletion of the origin is it an error to ask for the origin (uncompiled)?}
		set status [catch {
		    namespace eval [namespace current] "namespace origin $oldname"
		} cres copts]
		if {$status && [string match {invalid command name "*::ns2::ns1"} $cres]} {
		    lappend res 1
		} else {
		    lappend res $cres
		}

		lappend res {after deletion of origin, [namespace which] on the imported routine returns the empty string}
		set which [namespace which $oldname]
		if {$which eq {}} {
		    lappend res 1
		} else {
		    lappend res $which
		}

		return
	}

    }
} -body {
    namespace eval ns0::ns1 {
	    namespace ensemble create
    }

    namespace eval ns0::ns2 {
	    namespace import [namespace parent]::ns1
	    trace add command ns1 delete [namespace parent]::traced
	    rename ns1 {}
    }
    return $ns0::res
} -cleanup {
    namespace delete ns0
} -result [list \
    {Is oldname the name of the imported routine?} 1 \
    {[namespace which] finds the old name} 1 \
    {Is origin name correct} 1 \
    {After deletion of the origin is it an error to ask for the origin (compiled)?} 1 \
    {After deletion of the origin is it an error to ask for the origin (uncompiled)?} 1 \
    {after deletion of origin, [namespace which] on the imported routine returns the empty string} 1 \
]


test namespace-14.1 {TclGetNamespaceForQualName, absolute names} -setup {
    catch {namespace delete {*}[namespace children :: test_ns_*]}
    variable v 10
    namespace eval test_ns_1::test_ns_2 {
        variable v 20
    }