* Variables that are part of the [apply] command implementation and which
 * have to be passed to the other side of the NRE call.
 */

typedef struct {
    int isRootEnsemble;
    Command cmd;
    ExtraFrameInfo efi;
} ApplyExtraData;

/*
 * Prototypes for static functions in this file
 */

static void		DupLambdaInternalRep(Tcl_Obj *objPtr,

     * later when the procedure is called to determine what namespace the
     * procedure will run in. This will be different than the current
     * namespace if the proc was renamed into a different namespace.
     */

    procPtr->cmdPtr = (Command *) cmd;

    /*
     * TIP #280: Remember the line the procedure body is starting on. In a
     * bytecode context we ask the engine to provide us with the necessary
     * information. This is for the initialization of the byte code compiler
     * when the body is used for the first time.
     *
     * This code is nearly identical to the #280 code in SetLambdaFromAny, see
     * this file. The differences are the different index of the body in the
     * line array of the context, and the lamdba code requires some special
     * processing. Find a way to factor the common elements into a single
     * function.
     */

    if (iPtr->cmdFramePtr) {
	CmdFrame *contextPtr = TclStackAlloc(interp, sizeof(CmdFrame));

	*contextPtr = *iPtr->cmdFramePtr;
	if (contextPtr->type == TCL_LOCATION_BC) {
	    /*
	     * Retrieve source information from the bytecode, if possible. If
	     * the information is retrieved successfully, context.type will be
	     * TCL_LOCATION_SOURCE and the reference held by
	     * context.data.eval.path will be counted.
	     */

	    TclGetSrcInfoForPc(contextPtr);
	} else if (contextPtr->type == TCL_LOCATION_SOURCE) {
	    /*
	     * The copy into 'context' up above has created another reference
	     * to 'context.data.eval.path'; account for it.
	     */

	    Tcl_IncrRefCount(contextPtr->data.eval.path);
	}

	if (contextPtr->type == TCL_LOCATION_SOURCE) {
	    /*
	     * We can account for source location within a proc only if the
	     * proc body was not created by substitution.
	     */

	    if (contextPtr->line
		    && (contextPtr->nline >= 4) && (contextPtr->line[3] >= 0)) {
		int isNew;
		Tcl_HashEntry *hePtr;
		CmdFrame *cfPtr = ckalloc(sizeof(CmdFrame));

		cfPtr->level = -1;
		cfPtr->type = contextPtr->type;
		cfPtr->line = ckalloc(sizeof(int));
		cfPtr->line[0] = contextPtr->line[3];
		cfPtr->nline = 1;
		cfPtr->framePtr = NULL;
		cfPtr->nextPtr = NULL;

		cfPtr->data.eval.path = contextPtr->data.eval.path;
		Tcl_IncrRefCount(cfPtr->data.eval.path);

		cfPtr->cmd.str.cmd = NULL;
		cfPtr->cmd.str.len = 0;

		hePtr = Tcl_CreateHashEntry(iPtr->linePBodyPtr,
			procPtr, &isNew);
		if (!isNew) {
		    /*
		     * Get the old command frame and release it. See also
		     * TclProcCleanupProc in this file. Currently it seems as
		     * if only the procbodytest::proc command of the testsuite
		     * is able to trigger this situation.
		     */

		    CmdFrame *cfOldPtr = Tcl_GetHashValue(hePtr);

		    if (cfOldPtr->type == TCL_LOCATION_SOURCE) {
			Tcl_DecrRefCount(cfOldPtr->data.eval.path);
			cfOldPtr->data.eval.path = NULL;
		    }
		    ckfree(cfOldPtr->line);
		    cfOldPtr->line = NULL;
		    ckfree(cfOldPtr);
		}
		Tcl_SetHashValue(hePtr, cfPtr);
	    }

	    /*
	     * 'contextPtr' is going out of scope; account for the reference
	     * that it's holding to the path name.
	     */

	    Tcl_DecrRefCount(contextPtr->data.eval.path);
	    contextPtr->data.eval.path = NULL;
	}
	TclStackFree(interp, contextPtr);
    }

    /*
     * Optimize for no-op procs: if the body is not precompiled (like a TclPro
     * procbody), and the argument list is just "args" and the body is empty,
     * define a compileProc to compile a no-op.
     *
     * Notes:
     *	 - cannot be done for any argument list without having different

	 * means that the same code can not be shared by two procedures that
	 * have a different number of arguments, even if their bodies are
	 * identical. Note that we don't use Tcl_DuplicateObj since we would
	 * not want any bytecode internal representation.
	 */

	if (Tcl_IsShared(bodyPtr)) {
	    Tcl_Obj *sharedBodyPtr = bodyPtr;

	    bytes = TclGetStringFromObj(bodyPtr, &length);
	    bodyPtr = Tcl_NewStringObj(bytes, length);

	    /*
	     * TIP #280.
	     * Ensure that the continuation line data for the original body is
	     * not lost and applies to the new body as well.
	     */

	    TclContinuationsCopy(bodyPtr, sharedBodyPtr);
	}

	/*
	 * Create and initialize a Proc structure for the procedure. We
	 * increment the ref count of the procedure's body object since there
	 * will be a reference to it in the Proc structure.
	 */

    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{

    register Interp *iPtr = (Interp *) interp;
    CmdFrame *invoker = NULL;
    int word = 0;
    int result;
    CallFrame *savedVarFramePtr, *framePtr;
    Tcl_Obj *objPtr;

    if (objc < 2) {
    uplevelSyntax:
	Tcl_WrongNumArgs(interp, 1, objv, "?level? command ?arg ...?");

    iPtr->varFramePtr = framePtr;

    /*
     * Execute the residual arguments as a command.
     */

    if (objc == 1) {
	/*
	 * TIP #280. Make actual argument location available to eval'd script
	 */

	TclArgumentGet(interp, objv[0], &invoker, &word);
	objPtr = objv[0];

    } else {
	/*
	 * More than one argument: concatenate them together with spaces
	 * between, then evaluate the result. Tcl_EvalObjEx will delete the
	 * object when it decrements its refcount after eval'ing it.
	 */

	objPtr = Tcl_ConcatObj(objc, objv);
    }

    TclNRAddCallback(interp, Uplevel_Callback, savedVarFramePtr, NULL, NULL,
	    NULL);
    return TclNREvalObjEx(interp, objPtr, 0, invoker, word);
}

/*
 *----------------------------------------------------------------------
 *
 * TclFindProc --
 *

	    a[i] = (l < iPtr->varFramePtr->objc ?
		    TclGetString(iPtr->varFramePtr->objv[l]) : NULL);
	    l++;
	}
	TCL_DTRACE_PROC_ARGS(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
		a[8], a[9]);
    }
    if (TCL_DTRACE_PROC_INFO_ENABLED() && iPtr->cmdFramePtr) {
	Tcl_Obj *info = TclInfoFrame(interp, iPtr->cmdFramePtr);
	const char *a[6]; int i[2];

	TclDTraceInfo(info, a, i);
	TCL_DTRACE_PROC_INFO(a[0], a[1], a[2], a[3], i[0], i[1], a[4], a[5]);
	TclDecrRefCount(info);
    }
    if (TCL_DTRACE_PROC_ENTRY_ENABLED()) {
	int l = iPtr->varFramePtr->isProcCallFrame & FRAME_IS_LAMBDA ? 1 : 0;

	TCL_DTRACE_PROC_ENTRY(l < iPtr->varFramePtr->objc ?
		TclGetString(iPtr->varFramePtr->objv[l]) : NULL,
		iPtr->varFramePtr->objc - l - 1,
		(Tcl_Obj **)(iPtr->varFramePtr->objv + l + 1));

	} else {
	    bodyPtr->typePtr->freeIntRepProc(bodyPtr);
	    bodyPtr->typePtr = NULL;
	}
    }

    if (bodyPtr->typePtr != &tclByteCodeType) {
	Tcl_HashEntry *hePtr;

#ifdef TCL_COMPILE_DEBUG
	if (tclTraceCompile >= 1) {
	    /*
	     * Display a line summarizing the top level command we are about
	     * to compile.
	     */

	    }
	    procPtr->numCompiledLocals = procPtr->numArgs;
	}

	TclPushStackFrame(interp, &framePtr, (Tcl_Namespace *) nsPtr,
		/* isProcCallFrame */ 0);

	/*
	 * TIP #280: We get the invoking context from the cmdFrame which
	 * was saved by 'Tcl_ProcObjCmd' (using linePBodyPtr).
	 */

	hePtr = Tcl_FindHashEntry(iPtr->linePBodyPtr, (char *) procPtr);

	/*
	 * Constructed saved frame has body as word 0. See Tcl_ProcObjCmd.
	 */

	iPtr->invokeWord = 0;
	iPtr->invokeCmdFramePtr = (hePtr ? Tcl_GetHashValue(hePtr) : NULL);
	tclByteCodeType.setFromAnyProc(interp, bodyPtr);
	iPtr->invokeCmdFramePtr = NULL;
	TclPopStackFrame(interp);
    } else if (codePtr->nsEpoch != nsPtr->resolverEpoch) {
	/*
	 * The resolver epoch has changed, but we only need to invalidate the
	 * resolver cache.
	 */

TclProcCleanupProc(
    register Proc *procPtr)	/* Procedure to be deleted. */
{
    register CompiledLocal *localPtr;
    Tcl_Obj *bodyPtr = procPtr->bodyPtr;
    Tcl_Obj *defPtr;
    Tcl_ResolvedVarInfo *resVarInfo;
    Tcl_HashEntry *hePtr = NULL;
    CmdFrame *cfPtr = NULL;
    Interp *iPtr = procPtr->iPtr;

    if (bodyPtr != NULL) {
	Tcl_DecrRefCount(bodyPtr);
    }
    for (localPtr = procPtr->firstLocalPtr; localPtr != NULL; ) {
	CompiledLocal *nextPtr = localPtr->nextPtr;

	    defPtr = localPtr->defValuePtr;
	    Tcl_DecrRefCount(defPtr);
	}
	ckfree(localPtr);
	localPtr = nextPtr;
    }
    ckfree(procPtr);

    /*
     * TIP #280: Release the location data associated with this Proc
     * structure, if any. The interpreter may not exist (For example for
     * procbody structures created by tbcload.
     */

    if (!iPtr) {
	return;
    }

    hePtr = Tcl_FindHashEntry(iPtr->linePBodyPtr, (char *) procPtr);
    if (!hePtr) {
	return;
    }

    cfPtr = Tcl_GetHashValue(hePtr);

    if (cfPtr->type == TCL_LOCATION_SOURCE) {
	Tcl_DecrRefCount(cfPtr->data.eval.path);
	cfPtr->data.eval.path = NULL;
    }
    ckfree(cfPtr->line);
    cfPtr->line = NULL;
    ckfree(cfPtr);
    Tcl_DeleteHashEntry(hePtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclUpdateReturnInfo --
 *

}

static int
SetLambdaFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr)	/* The object to convert. */
{
    Interp *iPtr = (Interp *) interp;
    const char *name;
    Tcl_Obj *argsPtr, *bodyPtr, *nsObjPtr, **objv, *errPtr;
    int objc, result;
    Proc *procPtr;

    /*
     * Convert objPtr to list type first; if it cannot be converted, or if its

    /*
     * CAREFUL: TclCreateProc returns refCount==1! [Bug 1578454]
     * procPtr->refCount = 1;
     */

    procPtr->cmdPtr = NULL;

    /*
     * TIP #280: Remember the line the apply body is starting on. In a Byte
     * code context we ask the engine to provide us with the necessary
     * information. This is for the initialization of the byte code compiler
     * when the body is used for the first time.
     *
     * NOTE: The body is the second word in the 'objPtr'. Its location,
     * accessible through 'context.line[1]' (see below) is therefore only the
     * first approximation of the actual line the body is on. We have to use
     * the string rep of the 'objPtr' to determine the exact line. This is
     * available already through 'name'. Use 'TclListLines', see 'switch'
     * (tclCmdMZ.c).
     *
     * This code is nearly identical to the #280 code in Tcl_ProcObjCmd, see
     * this file. The differences are the different index of the body in the
     * line array of the context, and the special processing mentioned in the
     * previous paragraph to track into the list. Find a way to factor the
     * common elements into a single function.
     */

    if (iPtr->cmdFramePtr) {
	CmdFrame *contextPtr = TclStackAlloc(interp, sizeof(CmdFrame));

	*contextPtr = *iPtr->cmdFramePtr;
	if (contextPtr->type == TCL_LOCATION_BC) {
	    /*
	     * Retrieve the source context from the bytecode. This call
	     * accounts for the reference to the source file, if any, held in
	     * 'context.data.eval.path'.
	     */

	    TclGetSrcInfoForPc(contextPtr);
	} else if (contextPtr->type == TCL_LOCATION_SOURCE) {
	    /*
	     * We created a new reference to the source file path name when we
	     * created 'context' above. Account for the reference.
	     */

	    Tcl_IncrRefCount(contextPtr->data.eval.path);

	}

	if (contextPtr->type == TCL_LOCATION_SOURCE) {
	    /*
	     * We can record source location within a lambda only if the body
	     * was not created by substitution.
	     */

	    if (contextPtr->line
		    && (contextPtr->nline >= 2) && (contextPtr->line[1] >= 0)) {
		int isNew, buf[2];
		CmdFrame *cfPtr = ckalloc(sizeof(CmdFrame));

		/*
		 * Move from approximation (line of list cmd word) to actual
		 * location (line of 2nd list element).
		 */

		TclListLines(objPtr, contextPtr->line[1], 2, buf, NULL);

		cfPtr->level = -1;
		cfPtr->type = contextPtr->type;
		cfPtr->line = ckalloc(sizeof(int));
		cfPtr->line[0] = buf[1];
		cfPtr->nline = 1;
		cfPtr->framePtr = NULL;
		cfPtr->nextPtr = NULL;

		cfPtr->data.eval.path = contextPtr->data.eval.path;
		Tcl_IncrRefCount(cfPtr->data.eval.path);

		cfPtr->cmd.str.cmd = NULL;
		cfPtr->cmd.str.len = 0;

		Tcl_SetHashValue(Tcl_CreateHashEntry(iPtr->linePBodyPtr,
			procPtr, &isNew), cfPtr);
	    }

	    /*
	     * 'contextPtr' is going out of scope. Release the reference that
	     * it's holding to the source file path
	     */

	    Tcl_DecrRefCount(contextPtr->data.eval.path);
	}
	TclStackFree(interp, contextPtr);
    }

    /*
     * Set the namespace for this lambda: given by objv[2] understood as a
     * global reference, or else global per default.
     */

    if (objc == 2) {
	TclNewLiteralStringObj(nsObjPtr, "::");

    }

    extraPtr = TclStackAlloc(interp, sizeof(ApplyExtraData));
    memset(&extraPtr->cmd, 0, sizeof(Command));
    procPtr->cmdPtr = &extraPtr->cmd;
    extraPtr->cmd.nsPtr = (Namespace *) nsPtr;

    /*
     * TIP#280 (semi-)HACK!
     *
     * Using cmd.clientData to tell [info frame] how to render the lambdaPtr.
     * The InfoFrameCmd will detect this case by testing cmd.hPtr for NULL.
     * This condition holds here because of the memset() above, and nowhere
     * else (in the core). Regular commands always have a valid hPtr, and
     * lambda's never.
     */

    extraPtr->efi.length = 1;
    extraPtr->efi.fields[0].name = "lambda";
    extraPtr->efi.fields[0].proc = NULL;
    extraPtr->efi.fields[0].clientData = lambdaPtr;
    extraPtr->cmd.clientData = &extraPtr->efi;

    isRootEnsemble = (iPtr->ensembleRewrite.sourceObjs == NULL);
    if (isRootEnsemble) {
	iPtr->ensembleRewrite.sourceObjs = objv;
	iPtr->ensembleRewrite.numRemovedObjs = 1;
	iPtr->ensembleRewrite.numInsertedObjs = 0;
    } else {
	iPtr->ensembleRewrite.numInsertedObjs -= 1;