* Copyright (c) 1994-1998 Sun Microsystems, Inc.
 * Copyright (c) 2004-2006 Miguel Sofer
 * Copyright (c) 2007 Daniel A. Steffen <das@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclProc.c,v 1.46.2.54 2009/01/09 14:17:14 dgp Exp $
 */

#include "tclInt.h"
#include "tclCompile.h"
#include "tclOOInt.h"

/*

				 * Tcl_GetStringFromObj should panic
				 * instead. */
    NULL			/* SetFromAny function; Tcl_ConvertToType
				 * should panic instead. */
};

/*
 * The [upvar]/[uplevel] level reference type. Uses the ptrAndLongRep field,
 * encoding the type of level reference in ptr and the actual parsed out
 * offset in value.
 *
 * Uses the default behaviour throughout, and never disposes of the string
 * rep; it's just a cache type.
 */

static const Tcl_ObjType levelReferenceType = {
    "levelReference",

    /*
     * Parse object to figure out which level number to go to.
     */

    result = 1;
    curLevel = iPtr->varFramePtr->level;
    if (objPtr->typePtr == &levelReferenceType) {
	if (objPtr->internalRep.ptrAndLongRep.ptr != NULL) {
	    level = curLevel - objPtr->internalRep.ptrAndLongRep.value;
	} else {
	    level = objPtr->internalRep.ptrAndLongRep.value;
	}
	if (level < 0) {
	    goto levelError;
	}
	/* TODO: Consider skipping the typePtr checks */
    } else if (objPtr->typePtr == &tclIntType
#ifndef NO_WIDE_TYPE

	 * Cache for future reference.
	 *
	 * TODO: Use the new ptrAndLongRep intrep
	 */

	TclFreeIntRep(objPtr);
	objPtr->typePtr = &levelReferenceType;
	objPtr->internalRep.ptrAndLongRep.ptr = NULL;
	objPtr->internalRep.ptrAndLongRep.value = level;
    } else if (isdigit(UCHAR(*name))) { /* INTL: digit */
	if (Tcl_GetInt(interp, name, &level) != TCL_OK) {
	    return -1;
	}

	/*
	 * Cache for future reference.
	 *
	 * TODO: Use the new ptrAndLongRep intrep
	 */

	TclFreeIntRep(objPtr);
	objPtr->typePtr = &levelReferenceType;
	objPtr->internalRep.ptrAndLongRep.ptr = (void *) 1; /* non-NULL */
	objPtr->internalRep.ptrAndLongRep.value = level;
	level = curLevel - level;
    } else {
	/*
	 * Don't cache as the object *isn't* a level reference.
	 */

	level = curLevel - 1;

    }
    *framePtrPtr = framePtr;
    return result;

  levelError:
    Tcl_ResetResult(interp);
    Tcl_AppendResult(interp, "bad level \"", name, "\"", NULL);
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "LEVEL", NULL);
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_UplevelObjCmd --

     */

    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.