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markom |
/*
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* ------------------------------------------------------------------------
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* PACKAGE: [incr Tcl]
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* DESCRIPTION: Object-Oriented Extensions to Tcl
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*
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* This file contains procedures that belong in the Tcl/Tk core.
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* Hopefully, they'll migrate there soon.
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*
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* ========================================================================
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* AUTHOR: Michael J. McLennan
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* Bell Labs Innovations for Lucent Technologies
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* mmclennan@lucent.com
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* http://www.tcltk.com/itcl
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*
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* RCS: $Id: itcl_migrate.c,v 1.1.1.1 2002-01-16 10:24:46 markom Exp $
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* ========================================================================
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* Copyright (c) 1993-1998 Lucent Technologies, Inc.
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* ------------------------------------------------------------------------
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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#include "itclInt.h"
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/*
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*----------------------------------------------------------------------
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*
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* _Tcl_GetCallFrame --
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*
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* Checks the call stack and returns the call frame some number
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* of levels up. It is often useful to know the invocation
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* context for a command.
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*
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* Results:
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* Returns a token for the call frame 0 or more levels up in
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* the call stack.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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Tcl_CallFrame*
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_Tcl_GetCallFrame(interp, level)
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Tcl_Interp *interp; /* interpreter being queried */
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int level; /* number of levels up in the call stack (>= 0) */
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{
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Interp *iPtr = (Interp*)interp;
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CallFrame *framePtr;
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if (level < 0) {
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panic("itcl: _Tcl_GetCallFrame called with bad number of levels");
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}
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framePtr = iPtr->varFramePtr;
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while (framePtr && level > 0) {
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framePtr = framePtr->callerVarPtr;
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level--;
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}
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return (Tcl_CallFrame*)framePtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* _Tcl_ActivateCallFrame --
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*
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* Makes an existing call frame the current frame on the
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* call stack. Usually called in conjunction with
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* _Tcl_GetCallFrame to simulate the effect of an "uplevel"
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* command.
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*
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* Note that this procedure is different from Tcl_PushCallFrame,
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* which adds a new call frame to the call stack. This procedure
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* assumes that the call frame is already initialized, and it
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* merely activates it on the call stack.
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*
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* Results:
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* Returns a token for the call frame that was in effect before
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* activating the new context. That call frame can be restored
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* by calling _Tcl_ActivateCallFrame again.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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Tcl_CallFrame*
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_Tcl_ActivateCallFrame(interp, framePtr)
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Tcl_Interp *interp; /* interpreter being queried */
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Tcl_CallFrame *framePtr; /* call frame to be activated */
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{
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Interp *iPtr = (Interp*)interp;
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CallFrame *oldFramePtr;
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oldFramePtr = iPtr->varFramePtr;
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iPtr->varFramePtr = (CallFrame *) framePtr;
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return (Tcl_CallFrame *) oldFramePtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* _TclNewVar --
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*
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* Create a new heap-allocated variable that will eventually be
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* entered into a hashtable.
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*
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* Results:
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* The return value is a pointer to the new variable structure. It is
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* marked as a scalar variable (and not a link or array variable). Its
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* value initially is NULL. The variable is not part of any hash table
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* yet. Since it will be in a hashtable and not in a call frame, its
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* name field is set NULL. It is initially marked as undefined.
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*
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* Side effects:
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* Storage gets allocated.
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*
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*----------------------------------------------------------------------
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*/
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Var *
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_TclNewVar()
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{
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register Var *varPtr;
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varPtr = (Var *) ckalloc(sizeof(Var));
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varPtr->value.objPtr = NULL;
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varPtr->name = NULL;
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varPtr->nsPtr = NULL;
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varPtr->hPtr = NULL;
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varPtr->refCount = 0;
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varPtr->tracePtr = NULL;
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varPtr->searchPtr = NULL;
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varPtr->flags = (VAR_SCALAR | VAR_UNDEFINED | VAR_IN_HASHTABLE);
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return varPtr;
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}
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