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authorFred Drake <fdrake@acm.org>1998-02-26 22:01:23 (GMT)
committerFred Drake <fdrake@acm.org>1998-02-26 22:01:23 (GMT)
commitf39ed67fa27392e3c2e12503d608f09ad21c26b6 (patch)
treec5f396d02468c4a25ac7aaf95f1b127f5a53b795 /Doc
parent6c2176eea702f54cdc333f58b7b6944eaa9f756d (diff)
downloadcpython-f39ed67fa27392e3c2e12503d608f09ad21c26b6.zip
cpython-f39ed67fa27392e3c2e12503d608f09ad21c26b6.tar.gz
cpython-f39ed67fa27392e3c2e12503d608f09ad21c26b6.tar.bz2
Added \label{}s for logical addressing.
Diffstat (limited to 'Doc')
-rw-r--r--Doc/api.tex44
-rw-r--r--Doc/api/api.tex44
2 files changed, 88 insertions, 0 deletions
diff --git a/Doc/api.tex b/Doc/api.tex
index a0e6bc4..1a9eba4 100644
--- a/Doc/api.tex
+++ b/Doc/api.tex
@@ -36,6 +36,7 @@ source code releases.
% XXX a *really* short intro only.
\chapter{Introduction}
+\label{intro}
The Application Programmer's Interface to Python gives \C{} and \Cpp{}
programmers access to the Python interpreter at a variety of levels.
@@ -65,6 +66,7 @@ good idea to become familiar with writing an extension before
attempting to embed Python in a real application.
\section{Include Files}
+\label{includes}
All function, type and macro definitions needed to use the Python/C
API are included in your code by the following line:
@@ -89,6 +91,7 @@ versions, which may define additional names beginning with one of
these prefixes.
\section{Objects, Types and Reference Counts}
+\label{objects}
Most Python/C API functions have one or more arguments as well as a
return value of type \code{PyObject *}. This type is a pointer
@@ -110,6 +113,7 @@ object is of that type; for instance, \samp{PyList_Check(\var{a})} is
true iff the object pointed to by \var{a} is a Python list.
\subsection{Reference Counts}
+\label{refcounts}
The reference count is important because today's computers have a
finite (and often severly limited) memory size; it counts how many
@@ -170,6 +174,7 @@ the caller with the responsibility to call \cfunction{Py_DECREF()}
when they are done with the result; this soon becomes second nature.
\subsubsection{Reference Count Details}
+\label{refcountDetails}
The reference count behavior of functions in the Python/C API is best
expelained in terms of \emph{ownership of references}. Note that we
@@ -329,6 +334,7 @@ long sum_sequence(PyObject *sequence)
\end{verbatim}
\subsection{Types}
+\label{types}
There are few other data types that play a significant role in
the Python/C API; most are simple \C{} types such as \code{int},
@@ -338,6 +344,7 @@ by a module or the data attributes of a new object type. These will
be discussed together with the functions that use them.
\section{Exceptions}
+\label{exceptions}
The Python programmer only needs to deal with exceptions if specific
error handling is required; unhandled exceptions are automatically
@@ -470,6 +477,7 @@ successful.
\section{Embedding Python}
+\label{embedding}
The one important task that only embedders (as opposed to extension
writers) of the Python interpreter have to worry about is the
@@ -531,6 +539,7 @@ a later chapter.
\chapter{The Very High Level Layer}
+\label{veryhigh}
The functions in this chapter will let you execute Python source code
given in a file or a buffer, but they will not let you interact in a
@@ -568,6 +577,7 @@ more detailed way with the interpreter.
\chapter{Reference Counting}
+\label{countingRefs}
The macros in this section are used for managing reference counts
of Python objects.
@@ -620,6 +630,7 @@ PyMem_RESIZE(), PyMem_DEL(), PyMem_XDEL().
\chapter{Exception Handling}
+\label{exceptionHandling}
The functions in this chapter will let you handle and raise Python
exceptions. It is important to understand some of the basics of
@@ -809,6 +820,7 @@ variables and methods.
\section{Standard Exceptions}
+\label{standardExceptions}
All standard Python exceptions are available as global variables whose
names are \samp{PyExc_} followed by the Python exception name.
@@ -842,12 +854,14 @@ variables:
\chapter{Utilities}
+\label{utilities}
The functions in this chapter perform various utility tasks, such as
parsing function arguments and constructing Python values from \C{}
values.
\section{OS Utilities}
+\label{os}
\begin{cfuncdesc}{int}{Py_FdIsInteractive}{FILE *fp, char *filename}
Return true (nonzero) if the standard I/O file \var{fp} with name
@@ -866,6 +880,7 @@ the standard \C{} library function \cfunction{time()}.
\section{Process Control}
+\label{processControl}
\begin{cfuncdesc}{void}{Py_FatalError}{char *message}
Print a fatal error message and kill the process. No cleanup is
@@ -897,6 +912,7 @@ by \var{func}.
\section{Importing Modules}
+\label{importing}
\begin{cfuncdesc}{PyObject *}{PyImport_ImportModule}{char *name}
This is a simplified interface to \cfunction{PyImport_ImportModuleEx()}
@@ -1028,6 +1044,7 @@ dynamically created collection of frozen modules.
\chapter{Abstract Objects Layer}
+\label{abstract}
The functions in this chapter interact with Python objects regardless
of their type, or with wide classes of object types (e.g. all
@@ -1035,6 +1052,7 @@ numerical types, or all sequence types). When used on object types
for which they do not apply, they will flag a Python exception.
\section{Object Protocol}
+\label{object}
\begin{cfuncdesc}{int}{PyObject_Print}{PyObject *o, FILE *fp, int flags}
Print an object \var{o}, on file \var{fp}. Returns \code{-1} on error
@@ -1233,6 +1251,7 @@ failure. This is the equivalent of the Python statement \samp{del
\section{Number Protocol}
+\label{number}
\begin{cfuncdesc}{int}{PyNumber_Check}{PyObject *o}
Returns \code{1} if the object \var{o} provides numeric protocols, and
@@ -1390,6 +1409,7 @@ on failure. This is the equivalent of the Python expression
\section{Sequence Protocol}
+\label{sequence}
\begin{cfuncdesc}{int}{PySequence_Check}{PyObject *o}
Return \code{1} if the object provides sequence protocol, and \code{0}
@@ -1474,7 +1494,9 @@ Return the first index \var{i} for which \code{\var{o}[\var{i}] ==
the Python expression \samp{\var{o}.index(\var{value})}.
\end{cfuncdesc}
+
\section{Mapping Protocol}
+\label{mapping}
\begin{cfuncdesc}{int}{PyMapping_Check}{PyObject *o}
Return \code{1} if the object provides mapping protocol, and \code{0}
@@ -1626,6 +1648,7 @@ failure.
\chapter{Concrete Objects Layer}
+\label{concrete}
The functions in this chapter are specific to certain Python object
types. Passing them an object of the wrong type is not a good idea;
@@ -1637,12 +1660,14 @@ e.g. to check that an object is a dictionary, use
\section{Fundamental Objects}
+\label{fundamental}
This section describes Python type objects and the singleton object
\code{None}.
\subsection{Type Objects}
+\label{typeObjects}
\begin{ctypedesc}{PyTypeObject}
@@ -1654,6 +1679,7 @@ This section describes Python type objects and the singleton object
\subsection{The None Object}
+\label{noneObject}
\begin{cvardesc}{PyObject *}{Py_None}
XXX macro
@@ -1661,6 +1687,7 @@ XXX macro
\section{Sequence Objects}
+\label{sequenceObjects}
Generic operations on sequence objects were discussed in the previous
chapter; this section deals with the specific kinds of sequence
@@ -1668,6 +1695,7 @@ objects that are intrinsic to the Python language.
\subsection{String Objects}
+\label{stringObjects}
\begin{ctypedesc}{PyStringObject}
This subtype of \code{PyObject} represents a Python string object.
@@ -1731,6 +1759,7 @@ This instance of \code{PyTypeObject} represents the Python string type.
\subsection{Tuple Objects}
+\label{tupleObjects}
\begin{ctypedesc}{PyTupleObject}
This subtype of \code{PyObject} represents a Python tuple object.
@@ -1799,6 +1828,7 @@ tuple and creating a new one, only more efficiently.
\subsection{List Objects}
+\label{listObjects}
\begin{ctypedesc}{PyListObject}
This subtype of \code{PyObject} represents a Python list object.
@@ -1866,8 +1896,10 @@ Returns true if its argument is a \code{PyListObject}.
\section{Mapping Objects}
+\label{mapObjects}
\subsection{Dictionary Objects}
+\label{dictObjects}
\begin{ctypedesc}{PyDictObject}
This subtype of \code{PyObject} represents a Python dictionary object.
@@ -1956,8 +1988,10 @@ Returns the number of items in the dictionary.
\section{Numeric Objects}
+\label{numericObjects}
\subsection{Plain Integer Objects}
+\label{intObjects}
\begin{ctypedesc}{PyIntObject}
This subtype of \code{PyObject} represents a Python integer object.
@@ -1999,6 +2033,7 @@ Returns the systems idea of the largest integer it can handle
\subsection{Long Integer Objects}
+\label{longObjects}
\begin{ctypedesc}{PyLongObject}
This subtype of \code{PyObject} represents a Python long integer
@@ -2044,6 +2079,7 @@ Returns true if its argument is a \code{PyLongObject}.
\subsection{Floating Point Objects}
+\label{floatObjects}
\begin{ctypedesc}{PyFloatObject}
This subtype of \code{PyObject} represents a Python floating point
@@ -2073,6 +2109,7 @@ Returns true if its argument is a \code{PyFloatObject}.
\subsection{Complex Number Objects}
+\label{complexObjects}
\begin{ctypedesc}{Py_complex}
The \C{} structure which corresponds to the value portion of a Python
@@ -2148,8 +2185,10 @@ Returns true if its argument is a \code{PyComplexObject}.
\section{Other Objects}
+\label{otherObjects}
\subsection{File Objects}
+\label{fileObjects}
\begin{ctypedesc}{PyFileObject}
This subtype of \code{PyObject} represents a Python file object.
@@ -2211,11 +2250,13 @@ Writes string \var{s} to file object \var{p}.
\subsection{CObjects}
+\label{cObjects}
XXX
\chapter{Initialization, Finalization, and Threads}
+\label{initialization}
\begin{cfuncdesc}{void}{Py_Initialize}{}
Initialize the Python interpreter. In an application embedding
@@ -2505,6 +2546,7 @@ the variable \code{sys.version}.
% XXX Other PySys thingies (doesn't really belong in this chapter)
\section{Thread State and the Global Interpreter Lock}
+\label{threads}
The Python interpreter is not fully thread safe. In order to support
multi-threaded Python programs, there's a global lock that must be
@@ -2814,6 +2856,7 @@ must be held.
\chapter{Defining New Object Types}
+\label{newTypes}
\begin{cfuncdesc}{PyObject *}{_PyObject_New}{PyTypeObject *type}
\end{cfuncdesc}
@@ -2859,6 +2902,7 @@ Py_None, _Py_NoneStruct
\chapter{Debugging}
+\label{debugging}
XXX Explain Py_DEBUG, Py_TRACE_REFS, Py_REF_DEBUG.
diff --git a/Doc/api/api.tex b/Doc/api/api.tex
index a0e6bc4..1a9eba4 100644
--- a/Doc/api/api.tex
+++ b/Doc/api/api.tex
@@ -36,6 +36,7 @@ source code releases.
% XXX a *really* short intro only.
\chapter{Introduction}
+\label{intro}
The Application Programmer's Interface to Python gives \C{} and \Cpp{}
programmers access to the Python interpreter at a variety of levels.
@@ -65,6 +66,7 @@ good idea to become familiar with writing an extension before
attempting to embed Python in a real application.
\section{Include Files}
+\label{includes}
All function, type and macro definitions needed to use the Python/C
API are included in your code by the following line:
@@ -89,6 +91,7 @@ versions, which may define additional names beginning with one of
these prefixes.
\section{Objects, Types and Reference Counts}
+\label{objects}
Most Python/C API functions have one or more arguments as well as a
return value of type \code{PyObject *}. This type is a pointer
@@ -110,6 +113,7 @@ object is of that type; for instance, \samp{PyList_Check(\var{a})} is
true iff the object pointed to by \var{a} is a Python list.
\subsection{Reference Counts}
+\label{refcounts}
The reference count is important because today's computers have a
finite (and often severly limited) memory size; it counts how many
@@ -170,6 +174,7 @@ the caller with the responsibility to call \cfunction{Py_DECREF()}
when they are done with the result; this soon becomes second nature.
\subsubsection{Reference Count Details}
+\label{refcountDetails}
The reference count behavior of functions in the Python/C API is best
expelained in terms of \emph{ownership of references}. Note that we
@@ -329,6 +334,7 @@ long sum_sequence(PyObject *sequence)
\end{verbatim}
\subsection{Types}
+\label{types}
There are few other data types that play a significant role in
the Python/C API; most are simple \C{} types such as \code{int},
@@ -338,6 +344,7 @@ by a module or the data attributes of a new object type. These will
be discussed together with the functions that use them.
\section{Exceptions}
+\label{exceptions}
The Python programmer only needs to deal with exceptions if specific
error handling is required; unhandled exceptions are automatically
@@ -470,6 +477,7 @@ successful.
\section{Embedding Python}
+\label{embedding}
The one important task that only embedders (as opposed to extension
writers) of the Python interpreter have to worry about is the
@@ -531,6 +539,7 @@ a later chapter.
\chapter{The Very High Level Layer}
+\label{veryhigh}
The functions in this chapter will let you execute Python source code
given in a file or a buffer, but they will not let you interact in a
@@ -568,6 +577,7 @@ more detailed way with the interpreter.
\chapter{Reference Counting}
+\label{countingRefs}
The macros in this section are used for managing reference counts
of Python objects.
@@ -620,6 +630,7 @@ PyMem_RESIZE(), PyMem_DEL(), PyMem_XDEL().
\chapter{Exception Handling}
+\label{exceptionHandling}
The functions in this chapter will let you handle and raise Python
exceptions. It is important to understand some of the basics of
@@ -809,6 +820,7 @@ variables and methods.
\section{Standard Exceptions}
+\label{standardExceptions}
All standard Python exceptions are available as global variables whose
names are \samp{PyExc_} followed by the Python exception name.
@@ -842,12 +854,14 @@ variables:
\chapter{Utilities}
+\label{utilities}
The functions in this chapter perform various utility tasks, such as
parsing function arguments and constructing Python values from \C{}
values.
\section{OS Utilities}
+\label{os}
\begin{cfuncdesc}{int}{Py_FdIsInteractive}{FILE *fp, char *filename}
Return true (nonzero) if the standard I/O file \var{fp} with name
@@ -866,6 +880,7 @@ the standard \C{} library function \cfunction{time()}.
\section{Process Control}
+\label{processControl}
\begin{cfuncdesc}{void}{Py_FatalError}{char *message}
Print a fatal error message and kill the process. No cleanup is
@@ -897,6 +912,7 @@ by \var{func}.
\section{Importing Modules}
+\label{importing}
\begin{cfuncdesc}{PyObject *}{PyImport_ImportModule}{char *name}
This is a simplified interface to \cfunction{PyImport_ImportModuleEx()}
@@ -1028,6 +1044,7 @@ dynamically created collection of frozen modules.
\chapter{Abstract Objects Layer}
+\label{abstract}
The functions in this chapter interact with Python objects regardless
of their type, or with wide classes of object types (e.g. all
@@ -1035,6 +1052,7 @@ numerical types, or all sequence types). When used on object types
for which they do not apply, they will flag a Python exception.
\section{Object Protocol}
+\label{object}
\begin{cfuncdesc}{int}{PyObject_Print}{PyObject *o, FILE *fp, int flags}
Print an object \var{o}, on file \var{fp}. Returns \code{-1} on error
@@ -1233,6 +1251,7 @@ failure. This is the equivalent of the Python statement \samp{del
\section{Number Protocol}
+\label{number}
\begin{cfuncdesc}{int}{PyNumber_Check}{PyObject *o}
Returns \code{1} if the object \var{o} provides numeric protocols, and
@@ -1390,6 +1409,7 @@ on failure. This is the equivalent of the Python expression
\section{Sequence Protocol}
+\label{sequence}
\begin{cfuncdesc}{int}{PySequence_Check}{PyObject *o}
Return \code{1} if the object provides sequence protocol, and \code{0}
@@ -1474,7 +1494,9 @@ Return the first index \var{i} for which \code{\var{o}[\var{i}] ==
the Python expression \samp{\var{o}.index(\var{value})}.
\end{cfuncdesc}
+
\section{Mapping Protocol}
+\label{mapping}
\begin{cfuncdesc}{int}{PyMapping_Check}{PyObject *o}
Return \code{1} if the object provides mapping protocol, and \code{0}
@@ -1626,6 +1648,7 @@ failure.
\chapter{Concrete Objects Layer}
+\label{concrete}
The functions in this chapter are specific to certain Python object
types. Passing them an object of the wrong type is not a good idea;
@@ -1637,12 +1660,14 @@ e.g. to check that an object is a dictionary, use
\section{Fundamental Objects}
+\label{fundamental}
This section describes Python type objects and the singleton object
\code{None}.
\subsection{Type Objects}
+\label{typeObjects}
\begin{ctypedesc}{PyTypeObject}
@@ -1654,6 +1679,7 @@ This section describes Python type objects and the singleton object
\subsection{The None Object}
+\label{noneObject}
\begin{cvardesc}{PyObject *}{Py_None}
XXX macro
@@ -1661,6 +1687,7 @@ XXX macro
\section{Sequence Objects}
+\label{sequenceObjects}
Generic operations on sequence objects were discussed in the previous
chapter; this section deals with the specific kinds of sequence
@@ -1668,6 +1695,7 @@ objects that are intrinsic to the Python language.
\subsection{String Objects}
+\label{stringObjects}
\begin{ctypedesc}{PyStringObject}
This subtype of \code{PyObject} represents a Python string object.
@@ -1731,6 +1759,7 @@ This instance of \code{PyTypeObject} represents the Python string type.
\subsection{Tuple Objects}
+\label{tupleObjects}
\begin{ctypedesc}{PyTupleObject}
This subtype of \code{PyObject} represents a Python tuple object.
@@ -1799,6 +1828,7 @@ tuple and creating a new one, only more efficiently.
\subsection{List Objects}
+\label{listObjects}
\begin{ctypedesc}{PyListObject}
This subtype of \code{PyObject} represents a Python list object.
@@ -1866,8 +1896,10 @@ Returns true if its argument is a \code{PyListObject}.
\section{Mapping Objects}
+\label{mapObjects}
\subsection{Dictionary Objects}
+\label{dictObjects}
\begin{ctypedesc}{PyDictObject}
This subtype of \code{PyObject} represents a Python dictionary object.
@@ -1956,8 +1988,10 @@ Returns the number of items in the dictionary.
\section{Numeric Objects}
+\label{numericObjects}
\subsection{Plain Integer Objects}
+\label{intObjects}
\begin{ctypedesc}{PyIntObject}
This subtype of \code{PyObject} represents a Python integer object.
@@ -1999,6 +2033,7 @@ Returns the systems idea of the largest integer it can handle
\subsection{Long Integer Objects}
+\label{longObjects}
\begin{ctypedesc}{PyLongObject}
This subtype of \code{PyObject} represents a Python long integer
@@ -2044,6 +2079,7 @@ Returns true if its argument is a \code{PyLongObject}.
\subsection{Floating Point Objects}
+\label{floatObjects}
\begin{ctypedesc}{PyFloatObject}
This subtype of \code{PyObject} represents a Python floating point
@@ -2073,6 +2109,7 @@ Returns true if its argument is a \code{PyFloatObject}.
\subsection{Complex Number Objects}
+\label{complexObjects}
\begin{ctypedesc}{Py_complex}
The \C{} structure which corresponds to the value portion of a Python
@@ -2148,8 +2185,10 @@ Returns true if its argument is a \code{PyComplexObject}.
\section{Other Objects}
+\label{otherObjects}
\subsection{File Objects}
+\label{fileObjects}
\begin{ctypedesc}{PyFileObject}
This subtype of \code{PyObject} represents a Python file object.
@@ -2211,11 +2250,13 @@ Writes string \var{s} to file object \var{p}.
\subsection{CObjects}
+\label{cObjects}
XXX
\chapter{Initialization, Finalization, and Threads}
+\label{initialization}
\begin{cfuncdesc}{void}{Py_Initialize}{}
Initialize the Python interpreter. In an application embedding
@@ -2505,6 +2546,7 @@ the variable \code{sys.version}.
% XXX Other PySys thingies (doesn't really belong in this chapter)
\section{Thread State and the Global Interpreter Lock}
+\label{threads}
The Python interpreter is not fully thread safe. In order to support
multi-threaded Python programs, there's a global lock that must be
@@ -2814,6 +2856,7 @@ must be held.
\chapter{Defining New Object Types}
+\label{newTypes}
\begin{cfuncdesc}{PyObject *}{_PyObject_New}{PyTypeObject *type}
\end{cfuncdesc}
@@ -2859,6 +2902,7 @@ Py_None, _Py_NoneStruct
\chapter{Debugging}
+\label{debugging}
XXX Explain Py_DEBUG, Py_TRACE_REFS, Py_REF_DEBUG.
#n118'>118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 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/*
 * tclExecute.c --
 *
 *	This file contains procedures that execute byte-compiled Tcl commands.
 *
 * Copyright (c) 1996-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 by Scriptics Corporation.
 * Copyright (c) 2001 by Kevin B. Kenny. All rights reserved.
 * Copyright (c) 2002-2010 by Miguel Sofer.
 * Copyright (c) 2005-2007 by Donal K. Fellows.
 * Copyright (c) 2007 Daniel A. Steffen <das@users.sourceforge.net>
 * Copyright (c) 2006-2008 by Joe Mistachkin.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#include "tclCompile.h"
#include "tclOOInt.h"
#include "tommath.h"
#include <math.h>
#include <assert.h>

/*
 * Hack to determine whether we may expect IEEE floating point. The hack is
 * formally incorrect in that non-IEEE platforms might have the same precision
 * and range, but VAX, IBM, and Cray do not; are there any other floating
 * point units that we might care about?
 */

#if (FLT_RADIX == 2) && (DBL_MANT_DIG == 53) && (DBL_MAX_EXP == 1024)
#define IEEE_FLOATING_POINT
#endif

/*
 * A counter that is used to work out when the bytecode engine should call
 * Tcl_AsyncReady() to see whether there is a signal that needs handling, and
 * other expensive periodic operations.
 */

#ifndef ASYNC_CHECK_COUNT
#   define ASYNC_CHECK_COUNT	64
#endif /* !ASYNC_CHECK_COUNT */

/*
 * Boolean flag indicating whether the Tcl bytecode interpreter has been
 * initialized.
 */

static int execInitialized = 0;
TCL_DECLARE_MUTEX(execMutex)

static int cachedInExit = 0;

#ifdef TCL_COMPILE_DEBUG
/*
 * Variable that controls whether execution tracing is enabled and, if so,
 * what level of tracing is desired:
 *    0: no execution tracing
 *    1: trace invocations of Tcl procs only
 *    2: trace invocations of all (not compiled away) commands
 *    3: display each instruction executed
 * This variable is linked to the Tcl variable "tcl_traceExec".
 */

int tclTraceExec = 0;
#endif

/*
 * Mapping from expression instruction opcodes to strings; used for error
 * messages. Note that these entries must match the order and number of the
 * expression opcodes (e.g., INST_LOR) in tclCompile.h.
 *
 * Does not include the string for INST_EXPON (and beyond), as that is
 * disjoint for backward-compatability reasons.
 */

static const char *const operatorStrings[] = {
    "||", "&&", "|", "^", "&", "==", "!=", "<", ">", "<=", ">=", "<<", ">>",
    "+", "-", "*", "/", "%", "+", "-", "~", "!"
};

/*
 * Mapping from Tcl result codes to strings; used for error and debugging
 * messages.
 */

#ifdef TCL_COMPILE_DEBUG
static const char *const resultStrings[] = {
    "TCL_OK", "TCL_ERROR", "TCL_RETURN", "TCL_BREAK", "TCL_CONTINUE"
};
#endif

/*
 * These are used by evalstats to monitor object usage in Tcl.
 */

#ifdef TCL_COMPILE_STATS
long		tclObjsAlloced = 0;
long		tclObjsFreed = 0;
long		tclObjsShared[TCL_MAX_SHARED_OBJ_STATS] = { 0, 0, 0, 0, 0 };
#endif /* TCL_COMPILE_STATS */

/*
 * Support pre-8.5 bytecodes unless specifically requested otherwise.
 */

#ifndef TCL_SUPPORT_84_BYTECODE
#define TCL_SUPPORT_84_BYTECODE 1
#endif

#if TCL_SUPPORT_84_BYTECODE
/*
 * We need to know the tclBuiltinFuncTable to support translation of pre-8.5
 * math functions to the namespace-based ::tcl::mathfunc::op in 8.5+.
 */

typedef struct {
    const char *name;		/* Name of function. */
    int numArgs;		/* Number of arguments for function. */
} BuiltinFunc;

/*
 * Table describing the built-in math functions. Entries in this table are
 * indexed by the values of the INST_CALL_BUILTIN_FUNC instruction's
 * operand byte.
 */

static BuiltinFunc const tclBuiltinFuncTable[] = {
    {"acos", 1},
    {"asin", 1},
    {"atan", 1},
    {"atan2", 2},
    {"ceil", 1},
    {"cos", 1},
    {"cosh", 1},
    {"exp", 1},
    {"floor", 1},
    {"fmod", 2},
    {"hypot", 2},
    {"log", 1},
    {"log10", 1},
    {"pow", 2},
    {"sin", 1},
    {"sinh", 1},
    {"sqrt", 1},
    {"tan", 1},
    {"tanh", 1},
    {"abs", 1},
    {"double", 1},
    {"int", 1},
    {"rand", 0},
    {"round", 1},
    {"srand", 1},
    {"wide", 1},
    {NULL, 0},
};

#define LAST_BUILTIN_FUNC	25
#endif

/*
 * NR_TEBC
 * Helpers for NR - non-recursive calls to TEBC
 * Minimal data required to fully reconstruct the execution state.
 */

typedef struct TEBCdata {
    ByteCode *codePtr;		/* Constant until the BC returns */
				/* -----------------------------------------*/
    ptrdiff_t *catchTop;	/* These fields are used on return TO this */
    Tcl_Obj *auxObjList;	/* this level: they record the state when a */
    CmdFrame cmdFrame;		/* new codePtr was received for NR */
                                /* execution. */
    void *stack[1];		/* Start of the actual combined catch and obj
				 * stacks; the struct will be expanded as
				 * necessary */
} TEBCdata;

#define TEBC_YIELD() \
    do {						\
	esPtr->tosPtr = tosPtr;				\
	TclNRAddCallback(interp, TEBCresume,		\
		TD, pc, INT2PTR(cleanup), NULL);	\
    } while (0)

#define TEBC_DATA_DIG() \
    do {					\
	tosPtr = esPtr->tosPtr;			\
    } while (0)

#define PUSH_TAUX_OBJ(objPtr) \
    do {							\
	if (auxObjList) {					\
	    objPtr->length += auxObjList->length;		\
	}							\
	objPtr->internalRep.twoPtrValue.ptr1 = auxObjList;	\
	auxObjList = objPtr;					\
    } while (0)

#define POP_TAUX_OBJ() \
    do {							\
	tmpPtr = auxObjList;					\
	auxObjList = tmpPtr->internalRep.twoPtrValue.ptr1;	\
	Tcl_DecrRefCount(tmpPtr);				\
    } while (0)

/*
 * These variable-access macros have to coincide with those in tclVar.c
 */

#define VarHashGetValue(hPtr) \
    ((Var *) ((char *)hPtr - TclOffset(VarInHash, entry)))

static inline Var *
VarHashCreateVar(
    TclVarHashTable *tablePtr,
    Tcl_Obj *key,
    int *newPtr)
{
    Tcl_HashEntry *hPtr = Tcl_CreateHashEntry(&tablePtr->table,
	    key, newPtr);

    if (!hPtr) {
	return NULL;
    }
    return VarHashGetValue(hPtr);
}

#define VarHashFindVar(tablePtr, key) \
    VarHashCreateVar((tablePtr), (key), NULL)

/*
 * The new macro for ending an instruction; note that a reasonable C-optimiser
 * will resolve all branches at compile time. (result) is always a constant;
 * the macro NEXT_INST_F handles constant (nCleanup), NEXT_INST_V is resolved
 * at runtime for variable (nCleanup).
 *
 * ARGUMENTS:
 *    pcAdjustment: how much to increment pc
 *    nCleanup: how many objects to remove from the stack
 *    resultHandling: 0 indicates no object should be pushed on the stack;
 *	otherwise, push objResultPtr. If (result < 0), objResultPtr already
 *	has the correct reference count.
 *
 * We use the new compile-time assertions to check that nCleanup is constant
 * and within range.
 */

/* Verify the stack depth, only when no expansion is in progress */

#ifdef TCL_COMPILE_DEBUG
#define CHECK_STACK()							\
    do {								\
	ValidatePcAndStackTop(codePtr, pc, CURR_DEPTH,			\
		/*checkStack*/ !(starting || auxObjList));		\
	starting = 0;							\
    } while (0)
#else
#define CHECK_STACK()
#endif

#define NEXT_INST_F(pcAdjustment, nCleanup, resultHandling)	\
    do {							\
	TCL_CT_ASSERT((nCleanup >= 0) && (nCleanup <= 2));	\
	CHECK_STACK();						\
	if (nCleanup == 0) {					\
	    if (resultHandling != 0) {				\
		if ((resultHandling) > 0) {			\
		    PUSH_OBJECT(objResultPtr);			\
		} else {					\
		    *(++tosPtr) = objResultPtr;			\
		}						\
	    }							\
	    pc += (pcAdjustment);				\
	    goto cleanup0;					\
	} else if (resultHandling != 0) {			\
	    if ((resultHandling) > 0) {				\
		Tcl_IncrRefCount(objResultPtr);			\
	    }							\
	    pc += (pcAdjustment);				\
	    switch (nCleanup) {					\
	    case 1: goto cleanup1_pushObjResultPtr;		\
	    case 2: goto cleanup2_pushObjResultPtr;		\
	    case 0: break;					\
	    }							\
	} else {						\
	    pc += (pcAdjustment);				\
	    switch (nCleanup) {					\
	    case 1: goto cleanup1;				\
	    case 2: goto cleanup2;				\
	    case 0: break;					\
	    }							\
	}							\
    } while (0)

#define NEXT_INST_V(pcAdjustment, nCleanup, resultHandling)	\
    CHECK_STACK();						\
    do {							\
	pc += (pcAdjustment);					\
	cleanup = (nCleanup);					\
	if (resultHandling) {					\
	    if ((resultHandling) > 0) {				\
		Tcl_IncrRefCount(objResultPtr);			\
	    }							\
	    goto cleanupV_pushObjResultPtr;			\
	} else {						\
	    goto cleanupV;					\
	}							\
    } while (0)

#ifndef TCL_COMPILE_DEBUG
#define JUMP_PEEPHOLE_F(condition, pcAdjustment, cleanup) \
    do {								\
	pc += (pcAdjustment);						\
	switch (*pc) {							\
	case INST_JUMP_FALSE1:						\
	    NEXT_INST_F(((condition)? 2 : TclGetInt1AtPtr(pc+1)), (cleanup), 0); \
	case INST_JUMP_TRUE1:						\
	    NEXT_INST_F(((condition)? TclGetInt1AtPtr(pc+1) : 2), (cleanup), 0); \
	case INST_JUMP_FALSE4:						\
	    NEXT_INST_F(((condition)? 5 : TclGetInt4AtPtr(pc+1)), (cleanup), 0); \
	case INST_JUMP_TRUE4:						\
	    NEXT_INST_F(((condition)? TclGetInt4AtPtr(pc+1) : 5), (cleanup), 0); \
	default:							\
	    if ((condition) < 0) {					\
		TclNewLongObj(objResultPtr, -1);				\
	    } else {							\
		objResultPtr = TCONST((condition) > 0);			\
	    }								\
	    NEXT_INST_F(0, (cleanup), 1);				\
	}								\
    } while (0)
#define JUMP_PEEPHOLE_V(condition, pcAdjustment, cleanup) \
    do {								\
	pc += (pcAdjustment);						\
	switch (*pc) {							\
	case INST_JUMP_FALSE1:						\
	    NEXT_INST_V(((condition)? 2 : TclGetInt1AtPtr(pc+1)), (cleanup), 0); \
	case INST_JUMP_TRUE1:						\
	    NEXT_INST_V(((condition)? TclGetInt1AtPtr(pc+1) : 2), (cleanup), 0); \
	case INST_JUMP_FALSE4:						\
	    NEXT_INST_V(((condition)? 5 : TclGetInt4AtPtr(pc+1)), (cleanup), 0); \
	case INST_JUMP_TRUE4:						\
	    NEXT_INST_V(((condition)? TclGetInt4AtPtr(pc+1) : 5), (cleanup), 0); \
	default:							\
	    if ((condition) < 0) {					\
		TclNewLongObj(objResultPtr, -1);				\
	    } else {							\
		objResultPtr = TCONST((condition) > 0);			\
	    }								\
	    NEXT_INST_V(0, (cleanup), 1);				\
	}								\
    } while (0)
#else /* TCL_COMPILE_DEBUG */
#define JUMP_PEEPHOLE_F(condition, pcAdjustment, cleanup) \
    do{									\
	if ((condition) < 0) {						\
	    TclNewLongObj(objResultPtr, -1);				\
	} else {							\
	    objResultPtr = TCONST((condition) > 0);			\
	}								\
	NEXT_INST_F((pcAdjustment), (cleanup), 1);			\
    } while (0)
#define JUMP_PEEPHOLE_V(condition, pcAdjustment, cleanup) \
    do{									\
	if ((condition) < 0) {						\
	    TclNewLongObj(objResultPtr, -1);				\
	} else {							\
	    objResultPtr = TCONST((condition) > 0);			\
	}								\
	NEXT_INST_V((pcAdjustment), (cleanup), 1);			\
    } while (0)
#endif

/*
 * Macros used to cache often-referenced Tcl evaluation stack information
 * in local variables. Note that a DECACHE_STACK_INFO()-CACHE_STACK_INFO()
 * pair must surround any call inside TclNRExecuteByteCode (and a few other
 * procedures that use this scheme) that could result in a recursive call
 * to TclNRExecuteByteCode.
 */

#define CACHE_STACK_INFO() \
    checkInterp = 1

#define DECACHE_STACK_INFO() \
    esPtr->tosPtr = tosPtr

/*
 * Macros used to access items on the Tcl evaluation stack. PUSH_OBJECT
 * increments the object's ref count since it makes the stack have another
 * reference pointing to the object. However, POP_OBJECT does not decrement
 * the ref count. This is because the stack may hold the only reference to the
 * object, so the object would be destroyed if its ref count were decremented
 * before the caller had a chance to, e.g., store it in a variable. It is the
 * caller's responsibility to decrement the ref count when it is finished with
 * an object.
 *
 * WARNING! It is essential that objPtr only appear once in the PUSH_OBJECT
 * macro. The actual parameter might be an expression with side effects, and
 * this ensures that it will be executed only once.
 */

#define PUSH_OBJECT(objPtr) \
    Tcl_IncrRefCount(*(++tosPtr) = (objPtr))

#define POP_OBJECT()	*(tosPtr--)

#define OBJ_AT_TOS	*tosPtr

#define OBJ_UNDER_TOS	*(tosPtr-1)

#define OBJ_AT_DEPTH(n)	*(tosPtr-(n))

#define CURR_DEPTH	((ptrdiff_t) (tosPtr - initTosPtr))

#define STACK_BASE(esPtr) ((esPtr)->stackWords - 1)

/*
 * Macros used to trace instruction execution. The macros TRACE,
 * TRACE_WITH_OBJ, and O2S are only used inside TclNRExecuteByteCode. O2S is
 * only used in TRACE* calls to get a string from an object.
 */

#ifdef TCL_COMPILE_DEBUG
#   define TRACE(a) \
    while (traceInstructions) {					\
	fprintf(stdout, "%2d: %2d (%u) %s ", iPtr->numLevels,	\
		(int) CURR_DEPTH,				\
		(unsigned) (pc - codePtr->codeStart),		\
		GetOpcodeName(pc));				\
	printf a;						\
	break;							\
    }
#   define TRACE_APPEND(a) \
    while (traceInstructions) {		\
	printf a;			\
	break;				\
    }
#   define TRACE_ERROR(interp) \
    TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
#   define TRACE_WITH_OBJ(a, objPtr) \
    while (traceInstructions) {					\
	fprintf(stdout, "%2d: %2d (%u) %s ", iPtr->numLevels,	\
		(int) CURR_DEPTH,				\
		(unsigned) (pc - codePtr->codeStart),		\
		GetOpcodeName(pc));				\
	printf a;						\
	TclPrintObject(stdout, objPtr, 30);			\
	fprintf(stdout, "\n");					\
	break;							\
    }
#   define O2S(objPtr) \
    (objPtr ? TclGetString(objPtr) : "")
#else /* !TCL_COMPILE_DEBUG */
#   define TRACE(a)
#   define TRACE_APPEND(a)
#   define TRACE_ERROR(interp)
#   define TRACE_WITH_OBJ(a, objPtr)
#   define O2S(objPtr)
#endif /* TCL_COMPILE_DEBUG */

/*
 * DTrace instruction probe macros.
 */

#define TCL_DTRACE_INST_NEXT() \
    do {								\
	if (TCL_DTRACE_INST_DONE_ENABLED()) {				\
	    if (curInstName) {						\
		TCL_DTRACE_INST_DONE(curInstName, (int) CURR_DEPTH,	\
			tosPtr);					\
	    }								\
	    curInstName = tclInstructionTable[*pc].name;		\
	    if (TCL_DTRACE_INST_START_ENABLED()) {			\
		TCL_DTRACE_INST_START(curInstName, (int) CURR_DEPTH,	\
			tosPtr);					\
	    }								\
	} else if (TCL_DTRACE_INST_START_ENABLED()) {			\
	    TCL_DTRACE_INST_START(tclInstructionTable[*pc].name,	\
			(int) CURR_DEPTH, tosPtr);			\
	}								\
    } while (0)
#define TCL_DTRACE_INST_LAST() \
    do {								\
	if (TCL_DTRACE_INST_DONE_ENABLED() && curInstName) {		\
	    TCL_DTRACE_INST_DONE(curInstName, (int) CURR_DEPTH, tosPtr);\
	}								\
    } while (0)

/*
 * Macro used in this file to save a function call for common uses of
 * TclGetNumberFromObj(). The ANSI C "prototype" is:
 *
 * MODULE_SCOPE int GetNumberFromObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
 *			ClientData *ptrPtr, int *tPtr);
 */

#ifdef TCL_WIDE_INT_IS_LONG
#define GetNumberFromObj(interp, objPtr, ptrPtr, tPtr) \
    (((objPtr)->typePtr == &tclIntType)					\
	?	(*(tPtr) = TCL_NUMBER_LONG,				\
		*(ptrPtr) = (ClientData)				\
		    (&((objPtr)->internalRep.longValue)), TCL_OK) :	\
    ((objPtr)->typePtr == &tclDoubleType)				\
	?	(((TclIsNaN((objPtr)->internalRep.doubleValue))		\
		    ?	(*(tPtr) = TCL_NUMBER_NAN)			\
		    :	(*(tPtr) = TCL_NUMBER_DOUBLE)),			\
		*(ptrPtr) = (ClientData)				\
		    (&((objPtr)->internalRep.doubleValue)), TCL_OK) :	\
    (((objPtr)->bytes != NULL) && ((objPtr)->length == 0))		\
	? TCL_ERROR :			\
    TclGetNumberFromObj((interp), (objPtr), (ptrPtr), (tPtr)))
#else /* !TCL_WIDE_INT_IS_LONG */
#define GetNumberFromObj(interp, objPtr, ptrPtr, tPtr) \
    (((objPtr)->typePtr == &tclIntType)					\
	?	(*(tPtr) = TCL_NUMBER_LONG,				\
		*(ptrPtr) = (ClientData)				\
		    (&((objPtr)->internalRep.longValue)), TCL_OK) :	\
    ((objPtr)->typePtr == &tclWideIntType)				\
	?	(*(tPtr) = TCL_NUMBER_WIDE,				\
		*(ptrPtr) = (ClientData)				\
		    (&((objPtr)->internalRep.wideValue)), TCL_OK) :	\
    ((objPtr)->typePtr == &tclDoubleType)				\
	?	(((TclIsNaN((objPtr)->internalRep.doubleValue))		\
		    ?	(*(tPtr) = TCL_NUMBER_NAN)			\
		    :	(*(tPtr) = TCL_NUMBER_DOUBLE)),			\
		*(ptrPtr) = (ClientData)				\
		    (&((objPtr)->internalRep.doubleValue)), TCL_OK) :	\
    (((objPtr)->bytes != NULL) && ((objPtr)->length == 0))		\
	? TCL_ERROR :			\
    TclGetNumberFromObj((interp), (objPtr), (ptrPtr), (tPtr)))
#endif /* TCL_WIDE_INT_IS_LONG */

/*
 * Macro used in this file to save a function call for common uses of
 * Tcl_GetBooleanFromObj(). The ANSI C "prototype" is:
 *
 * MODULE_SCOPE int TclGetBooleanFromObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
 *			int *boolPtr);
 */

#define TclGetBooleanFromObj(interp, objPtr, boolPtr) \
    ((((objPtr)->typePtr == &tclIntType)				\
	|| ((objPtr)->typePtr == &tclBooleanType))			\
	? (*(boolPtr) = ((objPtr)->internalRep.longValue!=0), TCL_OK)	\
	: Tcl_GetBooleanFromObj((interp), (objPtr), (boolPtr)))

/*
 * Macro used to make the check for type overflow more mnemonic. This works by
 * comparing sign bits; the rest of the word is irrelevant. The ANSI C
 * "prototype" (where inttype_t is any integer type) is:
 *
 * MODULE_SCOPE int Overflowing(inttype_t a, inttype_t b, inttype_t sum);
 *
 * Check first the condition most likely to fail in usual code (at least for
 * usage in [incr]: do the first summand and the sum have != signs?
 */

#define Overflowing(a,b,sum) ((((a)^(sum)) < 0) && (((a)^(b)) >= 0))

/*
 * Macro for checking whether the type is NaN, used when we're thinking about
 * throwing an error for supplying a non-number number.
 */

#ifndef ACCEPT_NAN
#define IsErroringNaNType(type)		((type) == TCL_NUMBER_NAN)
#else
#define IsErroringNaNType(type)		0
#endif

/*
 * Auxiliary tables used to compute powers of small integers.
 */

#if (LONG_MAX == 0x7fffffff)

/*
 * Maximum base that, when raised to powers 2, 3, ... 8, fits in a 32-bit
 * signed integer.
 */

static const long MaxBase32[] = {46340, 1290, 215, 73, 35, 21, 14};
static const size_t MaxBase32Size = sizeof(MaxBase32)/sizeof(long);

/*
 * Table giving 3, 4, ..., 11, raised to the powers 9, 10, ..., as far as they
 * fit in a 32-bit signed integer. Exp32Index[i] gives the starting index of
 * powers of i+3; Exp32Value[i] gives the corresponding powers.
 */

static const unsigned short Exp32Index[] = {
    0, 11, 18, 23, 26, 29, 31, 32, 33
};
static const size_t Exp32IndexSize =
    sizeof(Exp32Index) / sizeof(unsigned short);
static const long Exp32Value[] = {
    19683, 59049, 177147, 531441, 1594323, 4782969, 14348907, 43046721,
    129140163, 387420489, 1162261467, 262144, 1048576, 4194304,
    16777216, 67108864, 268435456, 1073741824, 1953125, 9765625,
    48828125, 244140625, 1220703125, 10077696, 60466176, 362797056,
    40353607, 282475249, 1977326743, 134217728, 1073741824, 387420489,
    1000000000
};
static const size_t Exp32ValueSize = sizeof(Exp32Value)/sizeof(long);
#endif /* LONG_MAX == 0x7fffffff -- 32 bit machine */

#if (LONG_MAX > 0x7fffffff) || !defined(TCL_WIDE_INT_IS_LONG)

/*
 * Maximum base that, when raised to powers 2, 3, ..., 16, fits in a
 * Tcl_WideInt.
 */

static const Tcl_WideInt MaxBase64[] = {
    (Tcl_WideInt)46340*65536+62259,	/* 3037000499 == isqrt(2**63-1) */
    (Tcl_WideInt)2097151, (Tcl_WideInt)55108, (Tcl_WideInt)6208,
    (Tcl_WideInt)1448, (Tcl_WideInt)511, (Tcl_WideInt)234, (Tcl_WideInt)127,
    (Tcl_WideInt)78, (Tcl_WideInt)52, (Tcl_WideInt)38, (Tcl_WideInt)28,
    (Tcl_WideInt)22, (Tcl_WideInt)18, (Tcl_WideInt)15
};
static const size_t MaxBase64Size = sizeof(MaxBase64)/sizeof(Tcl_WideInt);

/*
 * Table giving 3, 4, ..., 13 raised to powers greater than 16 when the
 * results fit in a 64-bit signed integer.
 */

static const unsigned short Exp64Index[] = {
    0, 23, 38, 49, 57, 63, 67, 70, 72, 74, 75, 76
};
static const size_t Exp64IndexSize =
    sizeof(Exp64Index) / sizeof(unsigned short);
static const Tcl_WideInt Exp64Value[] = {
    (Tcl_WideInt)243*243*243*3*3,
    (Tcl_WideInt)243*243*243*3*3*3,
    (Tcl_WideInt)243*243*243*3*3*3*3,
    (Tcl_WideInt)243*243*243*243,
    (Tcl_WideInt)243*243*243*243*3,
    (Tcl_WideInt)243*243*243*243*3*3,
    (Tcl_WideInt)243*243*243*243*3*3*3,
    (Tcl_WideInt)243*243*243*243*3*3*3*3,
    (Tcl_WideInt)243*243*243*243*243,
    (Tcl_WideInt)243*243*243*243*243*3,
    (Tcl_WideInt)243*243*243*243*243*3*3,
    (Tcl_WideInt)243*243*243*243*243*3*3*3,
    (Tcl_WideInt)243*243*243*243*243*3*3*3*3,
    (Tcl_WideInt)243*243*243*243*243*243,
    (Tcl_WideInt)243*243*243*243*243*243*3,
    (Tcl_WideInt)243*243*243*243*243*243*3*3,
    (Tcl_WideInt)243*243*243*243*243*243*3*3*3,
    (Tcl_WideInt)243*243*243*243*243*243*3*3*3*3,
    (Tcl_WideInt)243*243*243*243*243*243*243,
    (Tcl_WideInt)243*243*243*243*243*243*243*3,
    (Tcl_WideInt)243*243*243*243*243*243*243*3*3,
    (Tcl_WideInt)243*243*243*243*243*243*243*3*3*3,
    (Tcl_WideInt)243*243*243*243*243*243*243*3*3*3*3,
    (Tcl_WideInt)1024*1024*1024*4*4,
    (Tcl_WideInt)1024*1024*1024*4*4*4,
    (Tcl_WideInt)1024*1024*1024*4*4*4*4,
    (Tcl_WideInt)1024*1024*1024*1024,
    (Tcl_WideInt)1024*1024*1024*1024*4,
    (Tcl_WideInt)1024*1024*1024*1024*4*4,
    (Tcl_WideInt)1024*1024*1024*1024*4*4*4,
    (Tcl_WideInt)1024*1024*1024*1024*4*4*4*4,
    (Tcl_WideInt)1024*1024*1024*1024*1024,
    (Tcl_WideInt)1024*1024*1024*1024*1024*4,
    (Tcl_WideInt)1024*1024*1024*1024*1024*4*4,
    (Tcl_WideInt)1024*1024*1024*1024*1024*4*4*4,
    (Tcl_WideInt)1024*1024*1024*1024*1024*4*4*4*4,
    (Tcl_WideInt)1024*1024*1024*1024*1024*1024,
    (Tcl_WideInt)1024*1024*1024*1024*1024*1024*4,
    (Tcl_WideInt)3125*3125*3125*5*5,
    (Tcl_WideInt)3125*3125*3125*5*5*5,
    (Tcl_WideInt)3125*3125*3125*5*5*5*5,
    (Tcl_WideInt)3125*3125*3125*3125,
    (Tcl_WideInt)3125*3125*3125*3125*5,
    (Tcl_WideInt)3125*3125*3125*3125*5*5,
    (Tcl_WideInt)3125*3125*3125*3125*5*5*5,
    (Tcl_WideInt)3125*3125*3125*3125*5*5*5*5,
    (Tcl_WideInt)3125*3125*3125*3125*3125,
    (Tcl_WideInt)3125*3125*3125*3125*3125*5,
    (Tcl_WideInt)3125*3125*3125*3125*3125*5*5,
    (Tcl_WideInt)7776*7776*7776*6*6,
    (Tcl_WideInt)7776*7776*7776*6*6*6,
    (Tcl_WideInt)7776*7776*7776*6*6*6*6,
    (Tcl_WideInt)7776*7776*7776*7776,
    (Tcl_WideInt)7776*7776*7776*7776*6,
    (Tcl_WideInt)7776*7776*7776*7776*6*6,
    (Tcl_WideInt)7776*7776*7776*7776*6*6*6,
    (Tcl_WideInt)7776*7776*7776*7776*6*6*6*6,
    (Tcl_WideInt)16807*16807*16807*7*7,
    (Tcl_WideInt)16807*16807*16807*7*7*7,
    (Tcl_WideInt)16807*16807*16807*7*7*7*7,
    (Tcl_WideInt)16807*16807*16807*16807,
    (Tcl_WideInt)16807*16807*16807*16807*7,
    (Tcl_WideInt)16807*16807*16807*16807*7*7,
    (Tcl_WideInt)32768*32768*32768*8*8,
    (Tcl_WideInt)32768*32768*32768*8*8*8,
    (Tcl_WideInt)32768*32768*32768*8*8*8*8,
    (Tcl_WideInt)32768*32768*32768*32768,
    (Tcl_WideInt)59049*59049*59049*9*9,
    (Tcl_WideInt)59049*59049*59049*9*9*9,
    (Tcl_WideInt)59049*59049*59049*9*9*9*9,
    (Tcl_WideInt)100000*100000*100000*10*10,
    (Tcl_WideInt)100000*100000*100000*10*10*10,
    (Tcl_WideInt)161051*161051*161051*11*11,
    (Tcl_WideInt)161051*161051*161051*11*11*11,
    (Tcl_WideInt)248832*248832*248832*12*12,
    (Tcl_WideInt)371293*371293*371293*13*13
};
static const size_t Exp64ValueSize = sizeof(Exp64Value) / sizeof(Tcl_WideInt);
#endif /* (LONG_MAX > 0x7fffffff) || !defined(TCL_WIDE_INT_IS_LONG) */

/*
 * Markers for ExecuteExtendedBinaryMathOp.
 */

#define DIVIDED_BY_ZERO		((Tcl_Obj *) -1)
#define EXPONENT_OF_ZERO	((Tcl_Obj *) -2)
#define GENERAL_ARITHMETIC_ERROR ((Tcl_Obj *) -3)

/*
 * Declarations for local procedures to this file:
 */

#ifdef TCL_COMPILE_STATS
static int		EvalStatsCmd(ClientData clientData,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
#endif /* TCL_COMPILE_STATS */
#ifdef TCL_COMPILE_DEBUG
static const char *	GetOpcodeName(const unsigned char *pc);
static void		PrintByteCodeInfo(ByteCode *codePtr);
static const char *	StringForResultCode(int result);
static void		ValidatePcAndStackTop(ByteCode *codePtr,
			    const unsigned char *pc, int stackTop,
			    int checkStack);
#endif /* TCL_COMPILE_DEBUG */
static ByteCode *	CompileExprObj(Tcl_Interp *interp, Tcl_Obj *objPtr);
static void		DeleteExecStack(ExecStack *esPtr);
static void		DupExprCodeInternalRep(Tcl_Obj *srcPtr,
			    Tcl_Obj *copyPtr);
MODULE_SCOPE int	TclCompareTwoNumbers(Tcl_Obj *valuePtr,
			    Tcl_Obj *value2Ptr);
static Tcl_Obj *	ExecuteExtendedBinaryMathOp(Tcl_Interp *interp,
			    int opcode, Tcl_Obj **constants,
			    Tcl_Obj *valuePtr, Tcl_Obj *value2Ptr);
static Tcl_Obj *	ExecuteExtendedUnaryMathOp(int opcode,
			    Tcl_Obj *valuePtr);
static void		FreeExprCodeInternalRep(Tcl_Obj *objPtr);
static ExceptionRange *	GetExceptRangeForPc(const unsigned char *pc,
			    int searchMode, ByteCode *codePtr);
static const char *	GetSrcInfoForPc(const unsigned char *pc,
			    ByteCode *codePtr, int *lengthPtr,
			    const unsigned char **pcBeg, int *cmdIdxPtr);
static Tcl_Obj **	GrowEvaluationStack(ExecEnv *eePtr, int growth,
			    int move);
static void		IllegalExprOperandType(Tcl_Interp *interp,
			    const unsigned char *pc, Tcl_Obj *opndPtr);
static void		InitByteCodeExecution(Tcl_Interp *interp);
static inline int	wordSkip(void *ptr);
static void		ReleaseDictIterator(Tcl_Obj *objPtr);
/* Useful elsewhere, make available in tclInt.h or stubs? */
static Tcl_Obj **	StackAllocWords(Tcl_Interp *interp, int numWords);
static Tcl_Obj **	StackReallocWords(Tcl_Interp *interp, int numWords);
static Tcl_NRPostProc	CopyCallback;
static Tcl_NRPostProc	ExprObjCallback;
static Tcl_NRPostProc	FinalizeOONext;
static Tcl_NRPostProc	FinalizeOONextFilter;
static Tcl_NRPostProc   TEBCresume;

/*
 * The structure below defines a bytecode Tcl object type to hold the
 * compiled bytecode for Tcl expressions.
 */

static const Tcl_ObjType exprCodeType = {
    "exprcode",
    FreeExprCodeInternalRep,	/* freeIntRepProc */
    DupExprCodeInternalRep,	/* dupIntRepProc */
    NULL,			/* updateStringProc */
    NULL			/* setFromAnyProc */
};

/*
 * Custom object type only used in this file; values of its type should never
 * be seen by user scripts.
 */

static const Tcl_ObjType dictIteratorType = {
    "dictIterator",
    ReleaseDictIterator,
    NULL, NULL, NULL
};

/*
 *----------------------------------------------------------------------
 *
 * ReleaseDictIterator --
 *
 *	This takes apart a dictionary iterator that is stored in the given Tcl
 *	object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deallocates memory, marks the object as being untyped.
 *
 *----------------------------------------------------------------------
 */

static void
ReleaseDictIterator(
    Tcl_Obj *objPtr)
{
    Tcl_DictSearch *searchPtr;
    Tcl_Obj *dictPtr;

    /*
     * First kill the search, and then release the reference to the dictionary
     * that we were holding.
     */

    searchPtr = objPtr->internalRep.twoPtrValue.ptr1;
    Tcl_DictObjDone(searchPtr);
    ckfree(searchPtr);

    dictPtr = objPtr->internalRep.twoPtrValue.ptr2;
    TclDecrRefCount(dictPtr);

    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * InitByteCodeExecution --
 *
 *	This procedure is called once to initialize the Tcl bytecode
 *	interpreter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	This procedure initializes the array of instruction names. If
 *	compiling with the TCL_COMPILE_STATS flag, it initializes the array
 *	that counts the executions of each instruction and it creates the
 *	"evalstats" command. It also establishes the link between the Tcl
 *	"tcl_traceExec" and C "tclTraceExec" variables.
 *
 *----------------------------------------------------------------------
 */

static void
InitByteCodeExecution(
    Tcl_Interp *interp)		/* Interpreter for which the Tcl variable
				 * "tcl_traceExec" is linked to control
				 * instruction tracing. */
{
#ifdef TCL_COMPILE_DEBUG
    if (Tcl_LinkVar(interp, "tcl_traceExec", (char *) &tclTraceExec,
	    TCL_LINK_INT) != TCL_OK) {
	Tcl_Panic("InitByteCodeExecution: can't create link for tcl_traceExec variable");
    }
#endif
#ifdef TCL_COMPILE_STATS
    Tcl_CreateObjCommand(interp, "evalstats", EvalStatsCmd, NULL, NULL);
#endif /* TCL_COMPILE_STATS */
}

/*
 *----------------------------------------------------------------------
 *
 * TclCreateExecEnv --
 *
 *	This procedure creates a new execution environment for Tcl bytecode
 *	execution. An ExecEnv points to a Tcl evaluation stack. An ExecEnv is
 *	typically created once for each Tcl interpreter (Interp structure) and
 *	recursively passed to TclNRExecuteByteCode to execute ByteCode sequences
 *	for nested commands.
 *
 * Results:
 *	A newly allocated ExecEnv is returned. This points to an empty
 *	evaluation stack of the standard initial size.
 *
 * Side effects:
 *	The bytecode interpreter is also initialized here, as this procedure
 *	will be called before any call to TclNRExecuteByteCode.
 *
 *----------------------------------------------------------------------
 */

ExecEnv *
TclCreateExecEnv(
    Tcl_Interp *interp,		/* Interpreter for which the execution
				 * environment is being created. */
    int size)			/* The initial stack size, in number of words
				 * [sizeof(Tcl_Obj*)] */
{
    ExecEnv *eePtr = ckalloc(sizeof(ExecEnv));
    ExecStack *esPtr = ckalloc(sizeof(ExecStack)
	    + (size_t) (size-1) * sizeof(Tcl_Obj *));

    eePtr->execStackPtr = esPtr;
    TclNewLongObj(eePtr->constants[0], 0);
    Tcl_IncrRefCount(eePtr->constants[0]);
    TclNewLongObj(eePtr->constants[1], 1);
    Tcl_IncrRefCount(eePtr->constants[1]);
    eePtr->interp = interp;
    eePtr->callbackPtr = NULL;
    eePtr->corPtr = NULL;
    eePtr->rewind = 0;

    esPtr->prevPtr = NULL;
    esPtr->nextPtr = NULL;
    esPtr->markerPtr = NULL;
    esPtr->endPtr = &esPtr->stackWords[size-1];
    esPtr->tosPtr = STACK_BASE(esPtr);

    Tcl_MutexLock(&execMutex);
    if (!execInitialized) {
	InitByteCodeExecution(interp);
	execInitialized = 1;
    }
    Tcl_MutexUnlock(&execMutex);

    return eePtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclDeleteExecEnv --
 *
 *	Frees the storage for an ExecEnv.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Storage for an ExecEnv and its contained storage (e.g. the evaluation
 *	stack) is freed.
 *
 *----------------------------------------------------------------------
 */

static void
DeleteExecStack(
    ExecStack *esPtr)
{
    if (esPtr->markerPtr && !cachedInExit) {
	Tcl_Panic("freeing an execStack which is still in use");
    }

    if (esPtr->prevPtr) {
	esPtr->prevPtr->nextPtr = esPtr->nextPtr;
    }
    if (esPtr->nextPtr) {
	esPtr->nextPtr->prevPtr = esPtr->prevPtr;
    }
    ckfree(esPtr);
}

void
TclDeleteExecEnv(
    ExecEnv *eePtr)		/* Execution environment to free. */
{
    ExecStack *esPtr = eePtr->execStackPtr, *tmpPtr;

	cachedInExit = TclInExit();

    /*
     * Delete all stacks in this exec env.
     */

    while (esPtr->nextPtr) {
	esPtr = esPtr->nextPtr;
    }
    while (esPtr) {
	tmpPtr = esPtr;
	esPtr = tmpPtr->prevPtr;
	DeleteExecStack(tmpPtr);
    }

    TclDecrRefCount(eePtr->constants[0]);
    TclDecrRefCount(eePtr->constants[1]);
    if (eePtr->callbackPtr && !cachedInExit) {
	Tcl_Panic("Deleting execEnv with pending TEOV callbacks!");
    }
    if (eePtr->corPtr && !cachedInExit) {
	Tcl_Panic("Deleting execEnv with existing coroutine");
    }
    ckfree(eePtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeExecution --
 *
 *	Finalizes the execution environment setup so that it can be later
 *	reinitialized.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	After this call, the next time TclCreateExecEnv will be called it will
 *	call InitByteCodeExecution.
 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeExecution(void)
{
    Tcl_MutexLock(&execMutex);
    execInitialized = 0;
    Tcl_MutexUnlock(&execMutex);
}

/*
 * Auxiliary code to insure that GrowEvaluationStack always returns correctly
 * aligned memory.
 *
 * WALLOCALIGN represents the alignment reqs in words, just as TCL_ALLOCALIGN
 * represents the reqs in bytes. This assumes that TCL_ALLOCALIGN is a
 * multiple of the wordsize 'sizeof(Tcl_Obj *)'.
 */

#define WALLOCALIGN \
    (TCL_ALLOCALIGN/sizeof(Tcl_Obj *))

/*
 * wordSkip computes how many words have to be skipped until the next aligned
 * word. Note that we are only interested in the low order bits of ptr, so
 * that any possible information loss in PTR2INT is of no consequence.
 */

static inline int
wordSkip(
    void *ptr)
{
    int mask = TCL_ALLOCALIGN-1;
    int base = PTR2INT(ptr) & mask;
    return (TCL_ALLOCALIGN - base)/sizeof(Tcl_Obj *);
}

/*
 * Given a marker, compute where the following aligned memory starts.
 */

#define MEMSTART(markerPtr) \
    ((markerPtr) + wordSkip(markerPtr))

/*
 *----------------------------------------------------------------------
 *
 * GrowEvaluationStack --
 *
 *	This procedure grows a Tcl evaluation stack stored in an ExecEnv,
 *	copying over the words since the last mark if so requested. A mark is
 *	set at the beginning of the new area when no copying is requested.
 *
 * Results:
 *	Returns a pointer to the first usable word in the (possibly) grown
 *	stack.
 *
 * Side effects:
 *	The size of the evaluation stack may be grown, a marker is set
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj **
GrowEvaluationStack(
    ExecEnv *eePtr,		/* Points to the ExecEnv with an evaluation
				 * stack to enlarge. */
    int growth,			/* How much larger than the current used
				 * size. */
    int move)			/* 1 if move words since last marker. */
{
    ExecStack *esPtr = eePtr->execStackPtr, *oldPtr = NULL;
    int newBytes, newElems, currElems;
    int needed = growth - (esPtr->endPtr - esPtr->tosPtr);
    Tcl_Obj **markerPtr = esPtr->markerPtr, **memStart;
    int moveWords = 0;

    if (move) {
	if (!markerPtr) {
	    Tcl_Panic("STACK: Reallocating with no previous alloc");
	}
	if (needed <= 0) {
	    return MEMSTART(markerPtr);
	}
    } else {
#ifndef PURIFY
	Tcl_Obj **tmpMarkerPtr = esPtr->tosPtr + 1;
	int offset = wordSkip(tmpMarkerPtr);

	if (needed + offset < 0) {
	    /*
	     * Put a marker pointing to the previous marker in this stack, and
	     * store it in esPtr as the current marker. Return a pointer to
	     * the start of aligned memory.
	     */

	    esPtr->markerPtr = tmpMarkerPtr;
	    memStart = tmpMarkerPtr + offset;
	    esPtr->tosPtr = memStart - 1;
	    *esPtr->markerPtr = (Tcl_Obj *) markerPtr;
	    return memStart;
	}
#endif
    }

    /*
     * Reset move to hold the number of words to be moved to new stack (if
     * any) and growth to hold the complete stack requirements: add one for
     * the marker, (WALLOCALIGN-1) for the maximal possible offset.
     */

    if (move) {
	moveWords = esPtr->tosPtr - MEMSTART(markerPtr) + 1;
    }
    needed = growth + moveWords + WALLOCALIGN;


    /*
     * Check if there is enough room in the next stack (if there is one, it
     * should be both empty and the last one!)
     */

    if (esPtr->nextPtr) {
	oldPtr = esPtr;
	esPtr = oldPtr->nextPtr;
	currElems = esPtr->endPtr - STACK_BASE(esPtr);
	if (esPtr->markerPtr || (esPtr->tosPtr != STACK_BASE(esPtr))) {
	    Tcl_Panic("STACK: Stack after current is in use");
	}
	if (esPtr->nextPtr) {
	    Tcl_Panic("STACK: Stack after current is not last");
	}
	if (needed <= currElems) {
	    goto newStackReady;
	}
	DeleteExecStack(esPtr);
	esPtr = oldPtr;
    } else {
	currElems = esPtr->endPtr - STACK_BASE(esPtr);
    }

    /*
     * We need to allocate a new stack! It needs to store 'growth' words,
     * including the elements to be copied over and the new marker.
     */

#ifndef PURIFY
    newElems = 2*currElems;
    while (needed > newElems) {
	newElems *= 2;
    }
#else
    newElems = needed;
#endif

    newBytes = sizeof(ExecStack) + (newElems-1) * sizeof(Tcl_Obj *);

    oldPtr = esPtr;
    esPtr = ckalloc(newBytes);

    oldPtr->nextPtr = esPtr;
    esPtr->prevPtr = oldPtr;
    esPtr->nextPtr = NULL;
    esPtr->endPtr = &esPtr->stackWords[newElems-1];

  newStackReady:
    eePtr->execStackPtr = esPtr;

    /*
     * Store a NULL marker at the beginning of the stack, to indicate that
     * this is the first marker in this stack and that rewinding to here
     * should actually be a return to the previous stack.
     */

    esPtr->stackWords[0] = NULL;
    esPtr->markerPtr = &esPtr->stackWords[0];
    memStart = MEMSTART(esPtr->markerPtr);
    esPtr->tosPtr = memStart - 1;

    if (move) {
	memcpy(memStart, MEMSTART(markerPtr), moveWords*sizeof(Tcl_Obj *));
	esPtr->tosPtr += moveWords;
	oldPtr->markerPtr = (Tcl_Obj **) *markerPtr;
	oldPtr->tosPtr = markerPtr-1;
    }

    /*
     * Free the old stack if it is now unused.
     */

    if (!oldPtr->markerPtr) {
	DeleteExecStack(oldPtr);
    }

    return memStart;
}

/*
 *--------------------------------------------------------------
 *
 * TclStackAlloc, TclStackRealloc, TclStackFree --
 *
 *	Allocate memory from the execution stack; it has to be returned later
 *	with a call to TclStackFree.
 *
 * Results:
 *	A pointer to the first byte allocated, or panics if the allocation did
 *	not succeed.
 *
 * Side effects:
 *	The execution stack may be grown.
 *
 *--------------------------------------------------------------
 */

static Tcl_Obj **
StackAllocWords(
    Tcl_Interp *interp,
    int numWords)
{
    /*
     * Note that GrowEvaluationStack sets a marker in the stack. This marker
     * is read when rewinding, e.g., by TclStackFree.
     */

    Interp *iPtr = (Interp *) interp;
    ExecEnv *eePtr = iPtr->execEnvPtr;
    Tcl_Obj **resPtr = GrowEvaluationStack(eePtr, numWords, 0);

    eePtr->execStackPtr->tosPtr += numWords;
    return resPtr;
}

static Tcl_Obj **
StackReallocWords(
    Tcl_Interp *interp,
    int numWords)
{
    Interp *iPtr = (Interp *) interp;
    ExecEnv *eePtr = iPtr->execEnvPtr;
    Tcl_Obj **resPtr = GrowEvaluationStack(eePtr, numWords, 1);

    eePtr->execStackPtr->tosPtr += numWords;
    return resPtr;
}

void
TclStackFree(
    Tcl_Interp *interp,
    void *freePtr)
{
    Interp *iPtr = (Interp *) interp;
    ExecEnv *eePtr;
    ExecStack *esPtr;
    Tcl_Obj **markerPtr, *marker;

    if (iPtr == NULL || iPtr->execEnvPtr == NULL) {
	ckfree(freePtr);
	return;
    }

    /*
     * Rewind the stack to the previous marker position. The current marker,
     * as set in the last call to GrowEvaluationStack, contains a pointer to
     * the previous marker.
     */

    eePtr = iPtr->execEnvPtr;
    esPtr = eePtr->execStackPtr;
    markerPtr = esPtr->markerPtr;
    marker = *markerPtr;

    if ((freePtr != NULL) && (MEMSTART(markerPtr) != (Tcl_Obj **)freePtr)) {
	Tcl_Panic("TclStackFree: incorrect freePtr (%p != %p). Call out of sequence?",
		freePtr, MEMSTART(markerPtr));
    }

    esPtr->tosPtr = markerPtr - 1;
    esPtr->markerPtr = (Tcl_Obj **) marker;
    if (marker) {
	return;
    }

    /*
     * Return to previous active stack. Note that repeated expansions or
     * reallocs could have generated several unused intervening stacks: free
     * them too.
     */

    while (esPtr->nextPtr) {
	esPtr = esPtr->nextPtr;
    }
    esPtr->tosPtr = STACK_BASE(esPtr);
    while (esPtr->prevPtr) {
	ExecStack *tmpPtr = esPtr->prevPtr;
	if (tmpPtr->tosPtr == STACK_BASE(tmpPtr)) {
	    DeleteExecStack(tmpPtr);
	} else {
	    break;
	}
    }
    if (esPtr->prevPtr) {
	eePtr->execStackPtr = esPtr->prevPtr;
#ifdef PURIFY
	eePtr->execStackPtr->nextPtr = NULL;
	DeleteExecStack(esPtr);
#endif
    } else {
	eePtr->execStackPtr = esPtr;
    }
}

void *
TclStackAlloc(
    Tcl_Interp *interp,
    int numBytes)
{
    Interp *iPtr = (Interp *) interp;
    int numWords = (numBytes + (sizeof(Tcl_Obj *) - 1))/sizeof(Tcl_Obj *);

    if (iPtr == NULL || iPtr->execEnvPtr == NULL) {
	return (void *) ckalloc(numBytes);
    }

    return (void *) StackAllocWords(interp, numWords);
}

void *
TclStackRealloc(
    Tcl_Interp *interp,
    void *ptr,
    int numBytes)
{
    Interp *iPtr = (Interp *) interp;
    ExecEnv *eePtr;
    ExecStack *esPtr;
    Tcl_Obj **markerPtr;
    int numWords;

    if (iPtr == NULL || iPtr->execEnvPtr == NULL) {
	return (void *) ckrealloc((char *) ptr, numBytes);
    }

    eePtr = iPtr->execEnvPtr;
    esPtr = eePtr->execStackPtr;
    markerPtr = esPtr->markerPtr;

    if (MEMSTART(markerPtr) != (Tcl_Obj **)ptr) {
	Tcl_Panic("TclStackRealloc: incorrect ptr. Call out of sequence?");
    }

    numWords = (numBytes + (sizeof(Tcl_Obj *) - 1))/sizeof(Tcl_Obj *);
    return (void *) StackReallocWords(interp, numWords);
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_ExprObj --
 *
 *	Evaluate an expression in a Tcl_Obj.
 *
 * Results:
 *	A standard Tcl object result. If the result is other than TCL_OK, then
 *	the interpreter's result contains an error message. If the result is
 *	TCL_OK, then a pointer to the expression's result value object is
 *	stored in resultPtrPtr. In that case, the object's ref count is
 *	incremented to reflect the reference returned to the caller; the
 *	caller is then responsible for the resulting object and must, for
 *	example, decrement the ref count when it is finished with the object.
 *
 * Side effects:
 *	Any side effects caused by subcommands in the expression, if any. The
 *	interpreter result is not modified unless there is an error.
 *
 *--------------------------------------------------------------
 */

int
Tcl_ExprObj(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    register Tcl_Obj *objPtr,	/* Points to Tcl object containing expression
				 * to evaluate. */
    Tcl_Obj **resultPtrPtr)	/* Where the Tcl_Obj* that is the expression
				 * result is stored if no errors occur. */
{
    NRE_callback *rootPtr = TOP_CB(interp);
    Tcl_Obj *resultPtr;

    TclNewObj(resultPtr);
    TclNRAddCallback(interp, CopyCallback, resultPtrPtr, resultPtr,
	    NULL, NULL);
    Tcl_NRExprObj(interp, objPtr, resultPtr);
    return TclNRRunCallbacks(interp, TCL_OK, rootPtr);
}

static int
CopyCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Tcl_Obj **resultPtrPtr = data[0];
    Tcl_Obj *resultPtr = data[1];

    if (result == TCL_OK) {
	*resultPtrPtr = resultPtr;
	Tcl_IncrRefCount(resultPtr);
    } else {
	Tcl_DecrRefCount(resultPtr);
    }
    return result;
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_NRExprObj --
 *
 *	Request evaluation of the expression in a Tcl_Obj by the NR stack.
 *
 * Results:
 *	Returns TCL_OK.
 *
 * Side effects:
 *	Compiles objPtr as a Tcl expression and places callbacks on the
 *	NR stack to execute the bytecode and store the result in resultPtr.
 *	If bytecode execution raises an exception, nothing is written
 *	to resultPtr, and the exceptional return code flows up the NR
 *	stack.  If the exception is TCL_ERROR, an error message is left
 *	in the interp result and the interp's return options dictionary
 *	holds additional error information too.  Execution of the bytecode
 *	may have other side effects, depending on the expression.
 *
 *--------------------------------------------------------------
 */

int
Tcl_NRExprObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr,
    Tcl_Obj *resultPtr)
{
    ByteCode *codePtr;
    Tcl_InterpState state = Tcl_SaveInterpState(interp, TCL_OK);

    Tcl_ResetResult(interp);
    codePtr = CompileExprObj(interp, objPtr);

    Tcl_NRAddCallback(interp, ExprObjCallback, state, resultPtr,
	    NULL, NULL);
    return TclNRExecuteByteCode(interp, codePtr);
}

static int
ExprObjCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Tcl_InterpState state = data[0];
    Tcl_Obj *resultPtr = data[1];

    if (result == TCL_OK) {
	TclSetDuplicateObj(resultPtr, Tcl_GetObjResult(interp));
	(void) Tcl_RestoreInterpState(interp, state);
    } else {
	Tcl_DiscardInterpState(state);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * CompileExprObj --
 *	Compile a Tcl expression value into ByteCode.
 *
 * Results:
 *	A (ByteCode *) is returned pointing to the resulting ByteCode.
 *
 * Side effects:
 *	The Tcl_ObjType of objPtr is changed to the "exprcode" type,
 *	and the ByteCode is kept in the internal rep (along with context
 *	data for checking validity) for faster operations the next time
 *	CompileExprObj is called on the same value.
 *
 *----------------------------------------------------------------------
 */

static ByteCode *
CompileExprObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr)
{
    Interp *iPtr = (Interp *) interp;
    CompileEnv compEnv;		/* Compilation environment structure allocated
				 * in frame. */
    register ByteCode *codePtr = NULL;
				/* Tcl Internal type of bytecode. Initialized
				 * to avoid compiler warning. */

    /*
     * Get the expression ByteCode from the object. If it exists, make sure it
     * is valid in the current context.
     */
    if (objPtr->typePtr == &exprCodeType) {
	Namespace *namespacePtr = iPtr->varFramePtr->nsPtr;

	codePtr = objPtr->internalRep.twoPtrValue.ptr1;
	if (((Interp *) *codePtr->interpHandle != iPtr)
		|| (codePtr->compileEpoch != iPtr->compileEpoch)
		|| (codePtr->nsPtr != namespacePtr)
		|| (codePtr->nsEpoch != namespacePtr->resolverEpoch)
		|| (codePtr->localCachePtr != iPtr->varFramePtr->localCachePtr)) {
	    TclFreeIntRep(objPtr);
	}
    }
    if (objPtr->typePtr != &exprCodeType) {
	/*
	 * TIP #280: No invoker (yet) - Expression compilation.
	 */

	const char *string = TclGetString(objPtr);

	TclInitCompileEnv(interp, &compEnv, string, objPtr->length, NULL, 0);
	TclCompileExpr(interp, string, objPtr->length, &compEnv, 0);

	/*
	 * Successful compilation. If the expression yielded no instructions,
	 * push an zero object as the expression's result.
	 */

	if (compEnv.codeNext == compEnv.codeStart) {
	    TclEmitPush(TclRegisterLiteral(&compEnv, "0", 1, 0),
		    &compEnv);
	}

	/*
	 * Add a "done" instruction as the last instruction and change the
	 * object into a ByteCode object. Ownership of the literal objects and
	 * aux data items is given to the ByteCode object.
	 */

	TclEmitOpcode(INST_DONE, &compEnv);
	codePtr = TclInitByteCodeObj(objPtr, &exprCodeType, &compEnv);
	TclFreeCompileEnv(&compEnv);
	if (iPtr->varFramePtr->localCachePtr) {
	    codePtr->localCachePtr = iPtr->varFramePtr->localCachePtr;
	    codePtr->localCachePtr->refCount++;
	}
#ifdef TCL_COMPILE_DEBUG
	if (tclTraceCompile == 2) {
	    TclPrintByteCodeObj(interp, objPtr);
	    fflush(stdout);
	}
#endif /* TCL_COMPILE_DEBUG */
    }
    return codePtr;
}

/*
 *----------------------------------------------------------------------
 *
 * DupExprCodeInternalRep --
 *
 *	Part of the Tcl object type implementation for Tcl expression
 *	bytecode. We do not copy the bytecode intrep. Instead, we return
 *	without setting copyPtr->typePtr, so the copy is a plain string copy
 *	of the expression value, and if it is to be used as a compiled
 *	expression, it will just need a recompile.
 *
 *	This makes sense, because with Tcl's copy-on-write practices, the
 *	usual (only?) time Tcl_DuplicateObj() will be called is when the copy
 *	is about to be modified, which would invalidate any copied bytecode
 *	anyway. The only reason it might make sense to copy the bytecode is if
 *	we had some modifying routines that operated directly on the intrep,
 *	like we do for lists and dicts.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
DupExprCodeInternalRep(
    Tcl_Obj *srcPtr,
    Tcl_Obj *copyPtr)
{
    return;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeExprCodeInternalRep --
 *
 *	Part of the Tcl object type implementation for Tcl expression
 *	bytecode. Frees the storage allocated to hold the internal rep, unless
 *	ref counts indicate bytecode execution is still in progress.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May free allocated memory. Leaves objPtr untyped.
 *
 *----------------------------------------------------------------------
 */

static void
FreeExprCodeInternalRep(
    Tcl_Obj *objPtr)
{
    ByteCode *codePtr = objPtr->internalRep.twoPtrValue.ptr1;

    TclReleaseByteCode(codePtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileObj --
 *
 *	This procedure compiles the script contained in a Tcl_Obj.
 *
 * Results:
 *	A pointer to the corresponding ByteCode, never NULL.
 *
 * Side effects:
 *	The object is shimmered to bytecode type.
 *
 *----------------------------------------------------------------------
 */

ByteCode *
TclCompileObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr,
    const CmdFrame *invoker,
    int word)
{
    register Interp *iPtr = (Interp *) interp;
    register ByteCode *codePtr;	/* Tcl Internal type of bytecode. */
    Namespace *namespacePtr = iPtr->varFramePtr->nsPtr;

    /*
     * If the object is not already of tclByteCodeType, compile it (and reset
     * the compilation flags in the interpreter; this should be done after any
     * compilation). Otherwise, check that it is "fresh" enough.
     */

    if (objPtr->typePtr == &tclByteCodeType) {
	/*
	 * Make sure the Bytecode hasn't been invalidated by, e.g., someone
	 * redefining a command with a compile procedure (this might make the
	 * compiled code wrong). The object needs to be recompiled if it was
	 * compiled in/for a different interpreter, or for a different
	 * namespace, or for the same namespace but with different name
	 * resolution rules. Precompiled objects, however, are immutable and
	 * therefore they are not recompiled, even if the epoch has changed.
	 *
	 * To be pedantically correct, we should also check that the
	 * originating procPtr is the same as the current context procPtr
	 * (assuming one exists at all - none for global level). This code is
	 * #def'ed out because [info body] was changed to never return a
	 * bytecode type object, which should obviate us from the extra checks
	 * here.
	 */

	codePtr = objPtr->internalRep.twoPtrValue.ptr1;
	if (((Interp *) *codePtr->interpHandle != iPtr)
		|| (codePtr->compileEpoch != iPtr->compileEpoch)
		|| (codePtr->nsPtr != namespacePtr)
		|| (codePtr->nsEpoch != namespacePtr->resolverEpoch)) {
	    if (!(codePtr->flags & TCL_BYTECODE_PRECOMPILED)) {
		goto recompileObj;
	    }
	    if ((Interp *) *codePtr->interpHandle != iPtr) {
		Tcl_Panic("Tcl_EvalObj: compiled script jumped interps");
	    }
	    codePtr->compileEpoch = iPtr->compileEpoch;
	}

	/*
	 * Check that any compiled locals do refer to the current proc
	 * environment! If not, recompile.
	 */

	if (!(codePtr->flags & TCL_BYTECODE_PRECOMPILED) &&
		(codePtr->procPtr == NULL) &&
		(codePtr->localCachePtr != iPtr->varFramePtr->localCachePtr)){
	    goto recompileObj;
	}

	/*
	 * #280.
	 * Literal sharing fix. This part of the fix is not required by 8.4
	 * nor 8.5, because they eval-direct any literals, so just saving the
	 * argument locations per command in bytecode is enough, embedded
	 * 'eval' commands, etc. get the correct information.
	 *
	 * But in 8.6 all the embedded script are compiled, and the resulting
	 * bytecode stored in the literal. Now the shared literal has bytecode
	 * with location data for _one_ particular location this literal is
	 * found at. If we get executed from a different location the bytecode
	 * has to be recompiled to get the correct locations. Not doing this
	 * will execute the saved bytecode with data for a different location,
	 * causing 'info frame' to point to the wrong place in the sources.
	 *
	 * Future optimizations ...
	 * (1) Save the location data (ExtCmdLoc) keyed by start line. In that
	 *     case we recompile once per location of the literal, but not
	 *     continously, because the moment we have all locations we do not
	 *     need to recompile any longer.
	 *
	 * (2) Alternative: Do not recompile, tell the execution engine the
	 *     offset between saved starting line and actual one. Then modify
	 *     the users to adjust the locations they have by this offset.
	 *
	 * (3) Alternative 2: Do not fully recompile, adjust just the location
	 *     information.
	 */

	if (invoker == NULL) {
	    return codePtr;
	} else {
	    Tcl_HashEntry *hePtr =
		    Tcl_FindHashEntry(iPtr->lineBCPtr, codePtr);
	    ExtCmdLoc *eclPtr;
	    CmdFrame *ctxCopyPtr;
	    int redo;

	    if (!hePtr) {
		return codePtr;
	    }

	    eclPtr = Tcl_GetHashValue(hePtr);
	    redo = 0;
	    ctxCopyPtr = TclStackAlloc(interp, sizeof(CmdFrame));
	    *ctxCopyPtr = *invoker;

	    if (invoker->type == TCL_LOCATION_BC) {
		/*
		 * Note: Type BC => ctx.data.eval.path    is not used.
		 *		    ctx.data.tebc.codePtr used instead
		 */

		TclGetSrcInfoForPc(ctxCopyPtr);
		if (ctxCopyPtr->type == TCL_LOCATION_SOURCE) {
		    /*
		     * The reference made by 'TclGetSrcInfoForPc' is dead.
		     */

		    Tcl_DecrRefCount(ctxCopyPtr->data.eval.path);
		    ctxCopyPtr->data.eval.path = NULL;
		}
	    }

	    if (word < ctxCopyPtr->nline) {
		/*
		 * Note: We do not care if the line[word] is -1. This is a
		 * difference and requires a recompile (location changed from
		 * absolute to relative, literal is used fixed and through
		 * variable)
		 *
		 * Example:
		 * test info-32.0 using literal of info-24.8
		 *     (dict with ... vs           set body ...).
		 */

		redo = ((eclPtr->type == TCL_LOCATION_SOURCE)
			    && (eclPtr->start != ctxCopyPtr->line[word]))
			|| ((eclPtr->type == TCL_LOCATION_BC)
			    && (ctxCopyPtr->type == TCL_LOCATION_SOURCE));
	    }

	    TclStackFree(interp, ctxCopyPtr);
	    if (!redo) {
		return codePtr;
	    }
	}
    }

  recompileObj:
    iPtr->errorLine = 1;

    /*
     * TIP #280. Remember the invoker for a moment in the interpreter
     * structures so that the byte code compiler can pick it up when
     * initializing the compilation environment, i.e. the extended location
     * information.
     */

    iPtr->invokeCmdFramePtr = invoker;
    iPtr->invokeWord = word;
    TclSetByteCodeFromAny(interp, objPtr, NULL, NULL);
    iPtr->invokeCmdFramePtr = NULL;
    codePtr = objPtr->internalRep.twoPtrValue.ptr1;
    if (iPtr->varFramePtr->localCachePtr) {
	codePtr->localCachePtr = iPtr->varFramePtr->localCachePtr;
	codePtr->localCachePtr->refCount++;
    }
    return codePtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclIncrObj --
 *
 *	Increment an integeral value in a Tcl_Obj by an integeral value held
 *	in another Tcl_Obj. Caller is responsible for making sure we can
 *	update the first object.
 *
 * Results:
 *	TCL_ERROR if either object is non-integer, and TCL_OK otherwise. On
 *	error, an error message is left in the interpreter (if it is not NULL,
 *	of course).
 *
 * Side effects:
 *	valuePtr gets the new incrmented value.
 *
 *----------------------------------------------------------------------
 */

int
TclIncrObj(
    Tcl_Interp *interp,
    Tcl_Obj *valuePtr,
    Tcl_Obj *incrPtr)
{
    ClientData ptr1, ptr2;
    int type1, type2;
    mp_int value, incr;

    if (Tcl_IsShared(valuePtr)) {
	Tcl_Panic("%s called with shared object", "TclIncrObj");
    }

    if (GetNumberFromObj(NULL, valuePtr, &ptr1, &type1) != TCL_OK) {
	/*
	 * Produce error message (reparse?!)
	 */

	return TclGetIntFromObj(interp, valuePtr, &type1);
    }
    if (GetNumberFromObj(NULL, incrPtr, &ptr2, &type2) != TCL_OK) {
	/*
	 * Produce error message (reparse?!)
	 */

	TclGetIntFromObj(interp, incrPtr, &type1);
	Tcl_AddErrorInfo(interp, "\n    (reading increment)");
	return TCL_ERROR;
    }

    if ((type1 == TCL_NUMBER_LONG) && (type2 == TCL_NUMBER_LONG)) {
	long augend = *((const long *) ptr1);
	long addend = *((const long *) ptr2);
	long sum = augend + addend;

	/*
	 * Overflow when (augend and sum have different sign) and (augend and
	 * addend have the same sign). This is encapsulated in the Overflowing
	 * macro.
	 */

	if (!Overflowing(augend, addend, sum)) {
	    TclSetLongObj(valuePtr, sum);
	    return TCL_OK;
	}
#ifndef TCL_WIDE_INT_IS_LONG
	{
	    Tcl_WideInt w1 = (Tcl_WideInt) augend;
	    Tcl_WideInt w2 = (Tcl_WideInt) addend;

	    /*
	     * We know the sum value is outside the long range, so we use the
	     * macro form that doesn't range test again.
	     */

	    TclSetWideIntObj(valuePtr, w1 + w2);
	    return TCL_OK;
	}
#endif
    }

    if ((type1 == TCL_NUMBER_DOUBLE) || (type1 == TCL_NUMBER_NAN)) {
	/*
	 * Produce error message (reparse?!)
	 */

	return TclGetIntFromObj(interp, valuePtr, &type1);
    }
    if ((type2 == TCL_NUMBER_DOUBLE) || (type2 == TCL_NUMBER_NAN)) {
	/*
	 * Produce error message (reparse?!)
	 */

	TclGetIntFromObj(interp, incrPtr, &type1);
	Tcl_AddErrorInfo(interp, "\n    (reading increment)");
	return TCL_ERROR;
    }

#ifndef TCL_WIDE_INT_IS_LONG
    if ((type1 != TCL_NUMBER_BIG) && (type2 != TCL_NUMBER_BIG)) {
	Tcl_WideInt w1, w2, sum;

	TclGetWideIntFromObj(NULL, valuePtr, &w1);
	TclGetWideIntFromObj(NULL, incrPtr, &w2);
	sum = w1 + w2;

	/*
	 * Check for overflow.
	 */

	if (!Overflowing(w1, w2, sum)) {
	    Tcl_SetWideIntObj(valuePtr, sum);
	    return TCL_OK;
	}
    }
#endif

    Tcl_TakeBignumFromObj(interp, valuePtr, &value);
    Tcl_GetBignumFromObj(interp, incrPtr, &incr);
    mp_add(&value, &incr, &value);
    mp_clear(&incr);
    Tcl_SetBignumObj(valuePtr, &value);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * ArgumentBCEnter --
 *
 *	This is a helper for TclNRExecuteByteCode/TEBCresume that encapsulates
 *	a code sequence that is fairly common in the code but *not* commonly
 *	called.
 *
 * Results:
 *	None
 *
 * Side effects:
 *	May register information about the bytecode in the command frame.
 *
 *----------------------------------------------------------------------
 */

static void
ArgumentBCEnter(
    Tcl_Interp *interp,
    ByteCode *codePtr,
    TEBCdata *tdPtr,
    const unsigned char *pc,
    int objc,
    Tcl_Obj **objv)
{
    int cmd;

    if (GetSrcInfoForPc(pc, codePtr, NULL, NULL, &cmd)) {
	TclArgumentBCEnter(interp, objv, objc, codePtr, &tdPtr->cmdFrame, cmd,
		pc - codePtr->codeStart);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclNRExecuteByteCode --
 *
 *	This procedure executes the instructions of a ByteCode structure. It
 *	returns when a "done" instruction is executed or an error occurs.
 *
 * Results:
 *	The return value is one of the return codes defined in tcl.h (such as
 *	TCL_OK), and interp->objResultPtr refers to a Tcl object that either
 *	contains the result of executing the code or an error message.
 *
 * Side effects:
 *	Almost certainly, depending on the ByteCode's instructions.
 *
 *----------------------------------------------------------------------
 */
#define	bcFramePtr	(&TD->cmdFrame)
#define	initCatchTop	((ptrdiff_t *) (&TD->stack[-1]))
#define	initTosPtr	((Tcl_Obj **) (initCatchTop+codePtr->maxExceptDepth))
#define esPtr		(iPtr->execEnvPtr->execStackPtr)

int
TclNRExecuteByteCode(
    Tcl_Interp *interp,		/* Token for command interpreter. */
    ByteCode *codePtr)		/* The bytecode sequence to interpret. */
{
    Interp *iPtr = (Interp *) interp;
    TEBCdata *TD;
    int size = sizeof(TEBCdata) - 1
	    + (codePtr->maxStackDepth + codePtr->maxExceptDepth)
		* sizeof(void *);
    int numWords = (size + sizeof(Tcl_Obj *) - 1) / sizeof(Tcl_Obj *);

    TclPreserveByteCode(codePtr);

    /*
     * Reserve the stack, setup the TEBCdataPtr (TD) and CallFrame
     *
     * The execution uses a unified stack: first a TEBCdata, immediately
     * above it a CmdFrame, then the catch stack, then the execution stack.
     *
     * Make sure the catch stack is large enough to hold the maximum number of
     * catch commands that could ever be executing at the same time (this will
     * be no more than the exception range array's depth). Make sure the
     * execution stack is large enough to execute this ByteCode.
     */

    TD = (TEBCdata *) GrowEvaluationStack(iPtr->execEnvPtr, numWords, 0);
    esPtr->tosPtr = initTosPtr;

    TD->codePtr     = codePtr;
    TD->catchTop    = initCatchTop;
    TD->auxObjList  = NULL;

    /*
     * TIP #280: Initialize the frame. Do not push it yet: it will be pushed
     * every time that we call out from this TD, popped when we return to it.
     */

    bcFramePtr->type = ((codePtr->flags & TCL_BYTECODE_PRECOMPILED)
	    ? TCL_LOCATION_PREBC : TCL_LOCATION_BC);
    bcFramePtr->level = (iPtr->cmdFramePtr ? iPtr->cmdFramePtr->level+1 : 1);
    bcFramePtr->framePtr = iPtr->framePtr;
    bcFramePtr->nextPtr = iPtr->cmdFramePtr;
    bcFramePtr->nline = 0;
    bcFramePtr->line = NULL;
    bcFramePtr->litarg = NULL;
    bcFramePtr->data.tebc.codePtr = codePtr;
    bcFramePtr->data.tebc.pc = NULL;
    bcFramePtr->cmdObj = NULL;
    bcFramePtr->cmd = NULL;
    bcFramePtr->len = 0;

#ifdef TCL_COMPILE_STATS
    iPtr->stats.numExecutions++;
#endif

    /*
     * Test namespace-50.9 demonstrates the need for this call.
     * Use a --enable-symbols=mem bug to see.
     */

    TclResetRewriteEnsemble(interp, 1);

    /*
     * Push the callback for bytecode execution
     */

    TclNRAddCallback(interp, TEBCresume, TD, /* pc */ NULL,
	    /* cleanup */ INT2PTR(0), NULL);
    return TCL_OK;
}

static int
TEBCresume(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    /*
     * Compiler cast directive - not a real variable.
     *	   Interp *iPtr = (Interp *) interp;
     */
#define iPtr ((Interp *) interp)

    /*
     * Check just the read-traced/write-traced bit of a variable.
     */

#define ReadTraced(varPtr) ((varPtr)->flags & VAR_TRACED_READ)
#define WriteTraced(varPtr) ((varPtr)->flags & VAR_TRACED_WRITE)
#define UnsetTraced(varPtr) ((varPtr)->flags & VAR_TRACED_UNSET)

    /*
     * Bottom of allocated stack holds the NR data
     */

    /*
     * Constants: variables that do not change during the execution, used
     * sporadically: no special need for speed.
     */

    unsigned interruptCounter = 1;
				/* Counter that is used to work out when to
				 * call Tcl_AsyncReady(). This must be 1
				 * initially so that we call the async-check
				 * stanza early, otherwise there are command
				 * sequences that can make the interpreter
				 * busy-loop without an opportunity to
				 * recognise an interrupt. */
    const char *curInstName;
#ifdef TCL_COMPILE_DEBUG
    int traceInstructions;	/* Whether we are doing instruction-level
				 * tracing or not. */
#endif

    Var *compiledLocals = iPtr->varFramePtr->compiledLocals;
    Tcl_Obj **constants = &iPtr->execEnvPtr->constants[0];

#define LOCAL(i)	(&compiledLocals[(i)])
#define TCONST(i)	(constants[(i)])

    /*
     * These macros are just meant to save some global variables that are not
     * used too frequently
     */

    TEBCdata *TD = data[0];
#define auxObjList	(TD->auxObjList)
#define catchTop	(TD->catchTop)
#define codePtr		(TD->codePtr)

    /*
     * Globals: variables that store state, must remain valid at all times.
     */

    Tcl_Obj **tosPtr;		/* Cached pointer to top of evaluation
				 * stack. */
    const unsigned char *pc = data[1];
                                /* The current program counter. */
    unsigned char inst;         /* The currently running instruction */

    /*
     * Transfer variables - needed only between opcodes, but not while
     * executing an instruction.
     */

    int cleanup = PTR2INT(data[2]);
    Tcl_Obj *objResultPtr;
    int checkInterp;            /* Indicates when a check of interp readyness
				 * is necessary. Set by CACHE_STACK_INFO() */

    /*
     * Locals - variables that are used within opcodes or bounded sections of
     * the file (jumps between opcodes within a family).
     * NOTE: These are now mostly defined locally where needed.
     */

    Tcl_Obj *objPtr, *valuePtr, *value2Ptr, *part1Ptr, *part2Ptr, *tmpPtr;
    Tcl_Obj **objv;
    int objc = 0;
    int opnd, length, pcAdjustment;
    Var *varPtr, *arrayPtr;
#ifdef TCL_COMPILE_DEBUG
    char cmdNameBuf[21];
#endif

#ifdef TCL_COMPILE_DEBUG
    int starting = 1;
    traceInstructions = (tclTraceExec == 3);
#endif

    TEBC_DATA_DIG();

#ifdef TCL_COMPILE_DEBUG
    if (!pc && (tclTraceExec >= 2)) {
	PrintByteCodeInfo(codePtr);
	fprintf(stdout, "  Starting stack top=%d\n", (int) CURR_DEPTH);
	fflush(stdout);
    }
#endif

    if (!pc) {
	/* bytecode is starting from scratch */
	checkInterp = 0;
	pc = codePtr->codeStart;
	goto cleanup0;
    } else {
        /* resume from invocation */
	CACHE_STACK_INFO();

	NRE_ASSERT(iPtr->cmdFramePtr == bcFramePtr);
	if (bcFramePtr->cmdObj) {
	    Tcl_DecrRefCount(bcFramePtr->cmdObj);
	    bcFramePtr->cmdObj = NULL;
	    bcFramePtr->cmd = NULL;
	}
	iPtr->cmdFramePtr = bcFramePtr->nextPtr;
	if (iPtr->flags & INTERP_DEBUG_FRAME) {
	    TclArgumentBCRelease(interp, bcFramePtr);
	}
	if (iPtr->execEnvPtr->rewind) {
	    result = TCL_ERROR;
	    goto abnormalReturn;
	}
	if (codePtr->flags & TCL_BYTECODE_RECOMPILE) {
	    iPtr->flags |= ERR_ALREADY_LOGGED;
	    codePtr->flags &= ~TCL_BYTECODE_RECOMPILE;
	}

	if (result != TCL_OK) {
	    pc--;
	    goto processExceptionReturn;
	}

	/*
	 * Push the call's object result and continue execution with the next
	 * instruction.
	 */

	TRACE_WITH_OBJ(("%u => ... after \"%.20s\": TCL_OK, result=",
		objc, cmdNameBuf), Tcl_GetObjResult(interp));

	/*
	 * Reset the interp's result to avoid possible duplications of large
	 * objects [Bug 781585]. We do not call Tcl_ResetResult to avoid any
	 * side effects caused by the resetting of errorInfo and errorCode
	 * [Bug 804681], which are not needed here. We chose instead to
	 * manipulate the interp's object result directly.
	 *
	 * Note that the result object is now in objResultPtr, it keeps the
	 * refCount it had in its role of iPtr->objResultPtr.
	 */

	objResultPtr = Tcl_GetObjResult(interp);
	TclNewObj(objPtr);
	Tcl_IncrRefCount(objPtr);
	iPtr->objResultPtr = objPtr;
#ifndef TCL_COMPILE_DEBUG
	if (*pc == INST_POP) {
	    TclDecrRefCount(objResultPtr);
	    NEXT_INST_V(1, cleanup, 0);
	}
#endif
	NEXT_INST_V(0, cleanup, -1);
    }

    /*
     * Targets for standard instruction endings; unrolled for speed in the
     * most frequent cases (instructions that consume up to two stack
     * elements).
     *
     * This used to be a "for(;;)" loop, with each instruction doing its own
     * cleanup.
     */

  cleanupV_pushObjResultPtr:
    switch (cleanup) {
    case 0:
	*(++tosPtr) = (objResultPtr);
	goto cleanup0;
    default:
	cleanup -= 2;
	while (cleanup--) {
	    objPtr = POP_OBJECT();
	    TclDecrRefCount(objPtr);
	}
    case 2:
    cleanup2_pushObjResultPtr:
	objPtr = POP_OBJECT();
	TclDecrRefCount(objPtr);
    case 1:
    cleanup1_pushObjResultPtr:
	objPtr = OBJ_AT_TOS;
	TclDecrRefCount(objPtr);
    }
    OBJ_AT_TOS = objResultPtr;
    goto cleanup0;

  cleanupV:
    switch (cleanup) {
    default:
	cleanup -= 2;
	while (cleanup--) {
	    objPtr = POP_OBJECT();
	    TclDecrRefCount(objPtr);
	}
    case 2:
    cleanup2:
	objPtr = POP_OBJECT();
	TclDecrRefCount(objPtr);
    case 1:
    cleanup1:
	objPtr = POP_OBJECT();
	TclDecrRefCount(objPtr);
    case 0:
	/*
	 * We really want to do nothing now, but this is needed for some
	 * compilers (SunPro CC).
	 */

	break;
    }
  cleanup0:

    /*
     * Check for asynchronous handlers [Bug 746722]; we do the check every
     * ASYNC_CHECK_COUNT instructions.
     */

    if ((--interruptCounter) == 0) {
	interruptCounter = ASYNC_CHECK_COUNT;
	DECACHE_STACK_INFO();
	if (TclAsyncReady(iPtr)) {
	    result = Tcl_AsyncInvoke(interp, result);
	    if (result == TCL_ERROR) {
		CACHE_STACK_INFO();
		goto gotError;
	    }
	}

	if (TclCanceled(iPtr)) {
	    if (Tcl_Canceled(interp, TCL_LEAVE_ERR_MSG) == TCL_ERROR) {
		CACHE_STACK_INFO();
		goto gotError;
	    }
	}

	if (TclLimitReady(iPtr->limit)) {
	    if (Tcl_LimitCheck(interp) == TCL_ERROR) {
		CACHE_STACK_INFO();
		goto gotError;
	    }
	}
	CACHE_STACK_INFO();
    }

    /*
     * These two instructions account for 26% of all instructions (according
     * to measurements on tclbench by Ben Vitale
     * [http://www.cs.toronto.edu/syslab/pubs/tcl2005-vitale-zaleski.pdf]
     * Resolving them before the switch reduces the cost of branch
     * mispredictions, seems to improve runtime by 5% to 15%, and (amazingly!)
     * reduces total obj size.
     */

    inst = *pc;

    peepholeStart:
#ifdef TCL_COMPILE_STATS
    iPtr->stats.instructionCount[*pc]++;
#endif

#ifdef TCL_COMPILE_DEBUG
    /*
     * Skip the stack depth check if an expansion is in progress.
     */

    CHECK_STACK();
    if (traceInstructions) {
	fprintf(stdout, "%2d: %2d ", iPtr->numLevels, (int) CURR_DEPTH);
	TclPrintInstruction(codePtr, pc);
	fflush(stdout);
    }
#endif /* TCL_COMPILE_DEBUG */

    TCL_DTRACE_INST_NEXT();

    if (inst == INST_LOAD_SCALAR1) {
	goto instLoadScalar1;
    } else if (inst == INST_PUSH1) {
	PUSH_OBJECT(codePtr->objArrayPtr[TclGetUInt1AtPtr(pc+1)]);
	TRACE_WITH_OBJ(("%u => ", TclGetUInt1AtPtr(pc+1)), OBJ_AT_TOS);
	inst = *(pc += 2);
	goto peepholeStart;
    } else if (inst == INST_START_CMD) {
	/*
	 * Peephole: do not run INST_START_CMD, just skip it
	 */

	iPtr->cmdCount += TclGetUInt4AtPtr(pc+5);
	if (checkInterp) {
	    checkInterp = 0;
	    if (((codePtr->compileEpoch != iPtr->compileEpoch) ||
		 (codePtr->nsEpoch != iPtr->varFramePtr->nsPtr->resolverEpoch)) &&
		!(codePtr->flags & TCL_BYTECODE_PRECOMPILED)) {
		goto instStartCmdFailed;
	    }
	}
	inst = *(pc += 9);
	goto peepholeStart;
    } else if (inst == INST_NOP) {
#ifndef TCL_COMPILE_DEBUG
	while (inst == INST_NOP)
#endif
	{
	    inst = *++pc;
	}
	goto peepholeStart;
    }

    switch (inst) {
    case INST_SYNTAX:
    case INST_RETURN_IMM: {
	int code = TclGetInt4AtPtr(pc+1);
	int level = TclGetUInt4AtPtr(pc+5);

	/*
	 * OBJ_AT_TOS is returnOpts, OBJ_UNDER_TOS is resultObjPtr.
	 */

	TRACE(("%u %u => ", code, level));
	result = TclProcessReturn(interp, code, level, OBJ_AT_TOS);
	if (result == TCL_OK) {
	    TRACE_APPEND(("continuing to next instruction (result=\"%.30s\")\n",
		    O2S(objResultPtr)));
	    NEXT_INST_F(9, 1, 0);
	}
	Tcl_SetObjResult(interp, OBJ_UNDER_TOS);
	if (*pc == INST_SYNTAX) {
	    iPtr->flags &= ~ERR_ALREADY_LOGGED;
	}
	cleanup = 2;
	TRACE_APPEND(("\n"));
	goto processExceptionReturn;
    }

    case INST_RETURN_STK:
	TRACE(("=> "));
	objResultPtr = POP_OBJECT();
	result = Tcl_SetReturnOptions(interp, OBJ_AT_TOS);
	if (result == TCL_OK) {
	    Tcl_DecrRefCount(OBJ_AT_TOS);
	    OBJ_AT_TOS = objResultPtr;
	    TRACE_APPEND(("continuing to next instruction (result=\"%.30s\")\n",
		    O2S(objResultPtr)));
	    NEXT_INST_F(1, 0, 0);
	} else if (result == TCL_ERROR) {
	    /*
	     * BEWARE! Must do this in this order, because an error in the
	     * option dictionary overrides the result (and can be verified by
	     * test).
	     */

	    Tcl_SetObjResult(interp, objResultPtr);
	    Tcl_SetReturnOptions(interp, OBJ_AT_TOS);
	    Tcl_DecrRefCount(OBJ_AT_TOS);
	    OBJ_AT_TOS = objResultPtr;
	} else {
	    Tcl_DecrRefCount(OBJ_AT_TOS);
	    OBJ_AT_TOS = objResultPtr;
	    Tcl_SetObjResult(interp, objResultPtr);
	}
	cleanup = 1;
	TRACE_APPEND(("\n"));
	goto processExceptionReturn;

    {
	CoroutineData *corPtr;
	int yieldParameter;

    case INST_YIELD:
	corPtr = iPtr->execEnvPtr->corPtr;
	TRACE(("%.30s => ", O2S(OBJ_AT_TOS)));
	if (!corPtr) {
	    TRACE_APPEND(("ERROR: yield outside coroutine\n"));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "yield can only be called in a coroutine", -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "ILLEGAL_YIELD",
		    NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}

#ifdef TCL_COMPILE_DEBUG
	if (tclTraceExec >= 2) {
	    if (traceInstructions) {
		TRACE_APPEND(("YIELD...\n"));
	    } else {
		fprintf(stdout, "%d: (%u) yielding value \"%.30s\"\n",
			iPtr->numLevels, (unsigned)(pc - codePtr->codeStart),
			Tcl_GetString(OBJ_AT_TOS));
	    }
	    fflush(stdout);
	}
#endif
	yieldParameter = 0;
	Tcl_SetObjResult(interp, OBJ_AT_TOS);
	goto doYield;

    case INST_YIELD_TO_INVOKE:
	corPtr = iPtr->execEnvPtr->corPtr;
	valuePtr = OBJ_AT_TOS;
	if (!corPtr) {
	    TRACE(("[%.30s] => ERROR: yield outside coroutine\n",
		    O2S(valuePtr)));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "yieldto can only be called in a coroutine", -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "ILLEGAL_YIELD",
		    NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}
	if (((Namespace *)TclGetCurrentNamespace(interp))->flags & NS_DYING) {
	    TRACE(("[%.30s] => ERROR: yield in deleted\n",
		    O2S(valuePtr)));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "yieldto called in deleted namespace", -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "YIELDTO_IN_DELETED",
		    NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}

#ifdef TCL_COMPILE_DEBUG
	if (tclTraceExec >= 2) {
	    if (traceInstructions) {
		TRACE(("[%.30s] => YIELD...\n", O2S(valuePtr)));
	    } else {
		/* FIXME: What is the right thing to trace? */
		fprintf(stdout, "%d: (%u) yielding to [%.30s]\n",
			iPtr->numLevels, (unsigned)(pc - codePtr->codeStart),
			TclGetString(valuePtr));
	    }
	    fflush(stdout);
	}
#endif

	/*
	 * Install a tailcall record in the caller and continue with the
	 * yield. The yield is switched into multi-return mode (via the
	 * 'yieldParameter').
	 */

	Tcl_IncrRefCount(valuePtr);
	iPtr->execEnvPtr = corPtr->callerEEPtr;
	TclSetTailcall(interp, valuePtr);
	iPtr->execEnvPtr = corPtr->eePtr;
	yieldParameter = (PTR2INT(NULL)+1);	/*==CORO_ACTIVATE_YIELDM*/

    doYield:
	/* TIP #280: Record the last piece of info needed by
	 * 'TclGetSrcInfoForPc', and push the frame.
	 */

	bcFramePtr->data.tebc.pc = (char *) pc;
	iPtr->cmdFramePtr = bcFramePtr;

	if (iPtr->flags & INTERP_DEBUG_FRAME) {
	    ArgumentBCEnter(interp, codePtr, TD, pc, objc, objv);
	}

	pc++;
	cleanup = 1;
	TEBC_YIELD();
	TclNRAddCallback(interp, TclNRCoroutineActivateCallback, corPtr,
		INT2PTR(yieldParameter), NULL, NULL);
	return TCL_OK;
    }

    case INST_TAILCALL: {
	Tcl_Obj *listPtr, *nsObjPtr;

	opnd = TclGetUInt1AtPtr(pc+1);

	if (!(iPtr->varFramePtr->isProcCallFrame & 1)) {
	    TRACE(("%d => ERROR: tailcall in non-proc context\n", opnd));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "tailcall can only be called from a proc or lambda", -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "TAILCALL", "ILLEGAL", NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}

#ifdef TCL_COMPILE_DEBUG
	/* FIXME: What is the right thing to trace? */
	{
	    register int i;

	    TRACE(("%d [", opnd));
	    for (i=opnd-1 ; i>=0 ; i--) {
		TRACE_APPEND(("\"%.30s\"", O2S(OBJ_AT_DEPTH(i))));
		if (i > 0) {
		    TRACE_APPEND((" "));
		}
	    }
	    TRACE_APPEND(("] => RETURN..."));
	}
#endif

	/*
	 * Push the evaluation of the called command into the NR callback
	 * stack.
	 */

	listPtr = Tcl_NewListObj(opnd, &OBJ_AT_DEPTH(opnd-1));
	nsObjPtr = Tcl_NewStringObj(iPtr->varFramePtr->nsPtr->fullName, -1);
	TclListObjSetElement(interp, listPtr, 0, nsObjPtr);
	if (iPtr->varFramePtr->tailcallPtr) {
	    Tcl_DecrRefCount(iPtr->varFramePtr->tailcallPtr);
	}
	iPtr->varFramePtr->tailcallPtr = listPtr;

	result = TCL_RETURN;
	cleanup = opnd;
	goto processExceptionReturn;
    }

    case INST_DONE:
	if (tosPtr > initTosPtr) {
	    /*
	     * Set the interpreter's object result to point to the topmost
	     * object from the stack, and check for a possible [catch]. The
	     * stackTop's level and refCount will be handled by "processCatch"
	     * or "abnormalReturn".
	     */

	    Tcl_SetObjResult(interp, OBJ_AT_TOS);
#ifdef TCL_COMPILE_DEBUG
	    TRACE_WITH_OBJ(("=> return code=%d, result=", result),
		    iPtr->objResultPtr);
	    if (traceInstructions) {
		fprintf(stdout, "\n");
	    }
#endif
	    goto checkForCatch;
	}
	(void) POP_OBJECT();
	goto abnormalReturn;

    case INST_PUSH4:
	objResultPtr = codePtr->objArrayPtr[TclGetUInt4AtPtr(pc+1)];
	TRACE_WITH_OBJ(("%u => ", TclGetUInt4AtPtr(pc+1)), objResultPtr);
	NEXT_INST_F(5, 0, 1);

    case INST_POP:
	TRACE_WITH_OBJ(("=> discarding "), OBJ_AT_TOS);
	objPtr = POP_OBJECT();
	TclDecrRefCount(objPtr);
	NEXT_INST_F(1, 0, 0);

    case INST_DUP:
	objResultPtr = OBJ_AT_TOS;
	TRACE_WITH_OBJ(("=> "), objResultPtr);
	NEXT_INST_F(1, 0, 1);

    case INST_OVER:
	opnd = TclGetUInt4AtPtr(pc+1);
	objResultPtr = OBJ_AT_DEPTH(opnd);
	TRACE_WITH_OBJ(("%u => ", opnd), objResultPtr);
	NEXT_INST_F(5, 0, 1);

    case INST_REVERSE: {
	Tcl_Obj **a, **b;

	opnd = TclGetUInt4AtPtr(pc+1);
	a = tosPtr-(opnd-1);
	b = tosPtr;
	while (a<b) {
	    tmpPtr = *a;
	    *a = *b;
	    *b = tmpPtr;
	    a++; b--;
	}
	TRACE(("%u => OK\n", opnd));
	NEXT_INST_F(5, 0, 0);
    }

    case INST_STR_CONCAT1:

	opnd = TclGetUInt1AtPtr(pc+1);

	if (TCL_OK != TclStringCatObjv(interp, /* inPlace */ 1,
		opnd, &OBJ_AT_DEPTH(opnd-1), &objResultPtr)) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	TRACE_WITH_OBJ(("%u => ", opnd), objResultPtr);
	NEXT_INST_V(2, opnd, 1);

    case INST_CONCAT_STK:
	/*
	 * Pop the opnd (objc) top stack elements, run through Tcl_ConcatObj,
	 * and then decrement their ref counts.
	 */

	opnd = TclGetUInt4AtPtr(pc+1);
	objResultPtr = Tcl_ConcatObj(opnd, &OBJ_AT_DEPTH(opnd-1));
	TRACE_WITH_OBJ(("%u => ", opnd), objResultPtr);
	NEXT_INST_V(5, opnd, 1);

    case INST_EXPAND_START:
	/*
	 * Push an element to the auxObjList. This records the current
	 * stack depth - i.e., the point in the stack where the expanded
	 * command starts.
	 *
	 * Use a Tcl_Obj as linked list element; slight mem waste, but faster
	 * allocation than ckalloc. This also abuses the Tcl_Obj structure, as
	 * we do not define a special tclObjType for it. It is not dangerous
	 * as the obj is never passed anywhere, so that all manipulations are
	 * performed here and in INST_INVOKE_EXPANDED (in case of an expansion
	 * error, also in INST_EXPAND_STKTOP).
	 */

	TclNewObj(objPtr);
	objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(CURR_DEPTH);
	objPtr->length = 0;
	PUSH_TAUX_OBJ(objPtr);
	TRACE(("=> mark depth as %d\n", (int) CURR_DEPTH));
	NEXT_INST_F(1, 0, 0);

    case INST_EXPAND_DROP:
	/*
	 * Drops an element of the auxObjList, popping stack elements to
	 * restore the stack to the state before the point where the aux
	 * element was created.
	 */

	CLANG_ASSERT(auxObjList);
	objc = CURR_DEPTH - PTR2INT(auxObjList->internalRep.twoPtrValue.ptr2);
	POP_TAUX_OBJ();
#ifdef TCL_COMPILE_DEBUG
	/* Ugly abuse! */
	starting = 1;
#endif
	TRACE(("=> drop %d items\n", objc));
	NEXT_INST_V(1, objc, 0);

    case INST_EXPAND_STKTOP: {
	int i;
	ptrdiff_t moved;

	/*
	 * Make sure that the element at stackTop is a list; if not, just
	 * leave with an error. Note that the element from the expand list
	 * will be removed at checkForCatch.
	 */

	objPtr = OBJ_AT_TOS;
	TRACE(("\"%.30s\" => ", O2S(objPtr)));
	if (TclListObjGetElements(interp, objPtr, &objc, &objv) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	(void) POP_OBJECT();

	/*
	 * Make sure there is enough room in the stack to expand this list
	 * *and* process the rest of the command (at least up to the next
	 * argument expansion or command end). The operand is the current
	 * stack depth, as seen by the compiler.
	 */

	auxObjList->length += objc - 1;
	if ((objc > 1) && (auxObjList->length > 0)) {
	    length = auxObjList->length /* Total expansion room we need */
		    + codePtr->maxStackDepth /* Beyond the original max */
		    - CURR_DEPTH;	/* Relative to where we are */
	    DECACHE_STACK_INFO();
	    moved = GrowEvaluationStack(iPtr->execEnvPtr, length, 1)
		    - (Tcl_Obj **) TD;
	    if (moved) {
		/*
		 * Change the global data to point to the new stack: move the
		 * TEBCdataPtr TD, recompute the position of every other
		 * stack-allocated parameter, update the stack pointers.
		 */

		TD = (TEBCdata *) (((Tcl_Obj **)TD) + moved);

		catchTop += moved;
		tosPtr += moved;
	    }
	}

	/*
	 * Expand the list at stacktop onto the stack; free the list. Knowing
	 * that it has a freeIntRepProc we use Tcl_DecrRefCount().
	 */

	for (i = 0; i < objc; i++) {
	    PUSH_OBJECT(objv[i]);
	}

	TRACE_APPEND(("OK\n"));
	Tcl_DecrRefCount(objPtr);
	NEXT_INST_F(5, 0, 0);
    }

    case INST_EXPR_STK: {
	ByteCode *newCodePtr;

	bcFramePtr->data.tebc.pc = (char *) pc;
	iPtr->cmdFramePtr = bcFramePtr;
	DECACHE_STACK_INFO();
	newCodePtr = CompileExprObj(interp, OBJ_AT_TOS);
	CACHE_STACK_INFO();
	cleanup = 1;
	pc++;
	TEBC_YIELD();
	return TclNRExecuteByteCode(interp, newCodePtr);
    }

	/*
	 * INVOCATION BLOCK
	 */

    instEvalStk:
    case INST_EVAL_STK:
	bcFramePtr->data.tebc.pc = (char *) pc;
	iPtr->cmdFramePtr = bcFramePtr;

	cleanup = 1;
	pc += 1;
	TEBC_YIELD();
	return TclNREvalObjEx(interp, OBJ_AT_TOS, 0, NULL, 0);

    case INST_INVOKE_EXPANDED:
	CLANG_ASSERT(auxObjList);
	objc = CURR_DEPTH - PTR2INT(auxObjList->internalRep.twoPtrValue.ptr2);
	POP_TAUX_OBJ();
	if (objc) {
	    pcAdjustment = 1;
	    goto doInvocation;
	}

	/*
	 * Nothing was expanded, return {}.
	 */

	TclNewObj(objResultPtr);
	NEXT_INST_F(1, 0, 1);

    case INST_INVOKE_STK4:
	objc = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	goto doInvocation;

    case INST_INVOKE_STK1:
	objc = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;

    doInvocation:
	objv = &OBJ_AT_DEPTH(objc-1);
	cleanup = objc;

#ifdef TCL_COMPILE_DEBUG
	if (tclTraceExec >= 2) {
	    int i;

	    if (traceInstructions) {
		strncpy(cmdNameBuf, TclGetString(objv[0]), 20);
		TRACE(("%u => call ", objc));
	    } else {
		fprintf(stdout, "%d: (%u) invoking ", iPtr->numLevels,
			(unsigned)(pc - codePtr->codeStart));
	    }
	    for (i = 0;  i < objc;  i++) {
		TclPrintObject(stdout, objv[i], 15);
		fprintf(stdout, " ");
	    }
	    fprintf(stdout, "\n");
	    fflush(stdout);
	}
#endif /*TCL_COMPILE_DEBUG*/

	/*
	 * Finally, let TclEvalObjv handle the command.
	 *
	 * TIP #280: Record the last piece of info needed by
	 * 'TclGetSrcInfoForPc', and push the frame.
	 */

	bcFramePtr->data.tebc.pc = (char *) pc;
	iPtr->cmdFramePtr = bcFramePtr;

	if (iPtr->flags & INTERP_DEBUG_FRAME) {
	    ArgumentBCEnter(interp, codePtr, TD, pc, objc, objv);
	}

	DECACHE_STACK_INFO();

	pc += pcAdjustment;
	TEBC_YIELD();
	return TclNREvalObjv(interp, objc, objv,
		TCL_EVAL_NOERR | TCL_EVAL_SOURCE_IN_FRAME, NULL);

#if TCL_SUPPORT_84_BYTECODE
    case INST_CALL_BUILTIN_FUNC1:
	/*
	 * Call one of the built-in pre-8.5 Tcl math functions. This
	 * translates to INST_INVOKE_STK1 with the first argument of
	 * ::tcl::mathfunc::$objv[0]. We need to insert the named math
	 * function into the stack.
	 */

	opnd = TclGetUInt1AtPtr(pc+1);
	if ((opnd < 0) || (opnd > LAST_BUILTIN_FUNC)) {
	    TRACE(("UNRECOGNIZED BUILTIN FUNC CODE %d\n", opnd));
	    Tcl_Panic("TclNRExecuteByteCode: unrecognized builtin function code %d", opnd);
	}

	TclNewLiteralStringObj(objPtr, "::tcl::mathfunc::");
	Tcl_AppendToObj(objPtr, tclBuiltinFuncTable[opnd].name, -1);

	/*
	 * Only 0, 1 or 2 args.
	 */

	{
	    int numArgs = tclBuiltinFuncTable[opnd].numArgs;
	    Tcl_Obj *tmpPtr1, *tmpPtr2;

	    if (numArgs == 0) {
		PUSH_OBJECT(objPtr);
	    } else if (numArgs == 1) {
		tmpPtr1 = POP_OBJECT();
		PUSH_OBJECT(objPtr);
		PUSH_OBJECT(tmpPtr1);
		Tcl_DecrRefCount(tmpPtr1);
	    } else {
		tmpPtr2 = POP_OBJECT();
		tmpPtr1 = POP_OBJECT();
		PUSH_OBJECT(objPtr);
		PUSH_OBJECT(tmpPtr1);
		PUSH_OBJECT(tmpPtr2);
		Tcl_DecrRefCount(tmpPtr1);
		Tcl_DecrRefCount(tmpPtr2);
	    }
	    objc = numArgs + 1;
	}
	pcAdjustment = 2;
	goto doInvocation;

    case INST_CALL_FUNC1:
	/*
	 * Call a non-builtin Tcl math function previously registered by a
	 * call to Tcl_CreateMathFunc pre-8.5. This is essentially
	 * INST_INVOKE_STK1 converting the first arg to
	 * ::tcl::mathfunc::$objv[0].
	 */

	objc = TclGetUInt1AtPtr(pc+1);	/* Number of arguments. The function
					 * name is the 0-th argument. */

	objPtr = OBJ_AT_DEPTH(objc-1);
	TclNewLiteralStringObj(tmpPtr, "::tcl::mathfunc::");
	Tcl_AppendObjToObj(tmpPtr, objPtr);
	Tcl_DecrRefCount(objPtr);

	/*
	 * Variation of PUSH_OBJECT.
	 */

	OBJ_AT_DEPTH(objc-1) = tmpPtr;
	Tcl_IncrRefCount(tmpPtr);

	pcAdjustment = 2;
	goto doInvocation;
#else
    /*
     * INST_CALL_BUILTIN_FUNC1 and INST_CALL_FUNC1 were made obsolete by the
     * changes to add a ::tcl::mathfunc namespace in 8.5. Optional support
     * remains for existing bytecode precompiled files.
     */

    case INST_CALL_BUILTIN_FUNC1:
	Tcl_Panic("TclNRExecuteByteCode: obsolete INST_CALL_BUILTIN_FUNC1 found");
    case INST_CALL_FUNC1:
	Tcl_Panic("TclNRExecuteByteCode: obsolete INST_CALL_FUNC1 found");
#endif

    case INST_INVOKE_REPLACE:
	objc = TclGetUInt4AtPtr(pc+1);
	opnd = TclGetUInt1AtPtr(pc+5);
	objPtr = POP_OBJECT();
	objv = &OBJ_AT_DEPTH(objc-1);
	cleanup = objc;
#ifdef TCL_COMPILE_DEBUG
	if (tclTraceExec >= 2) {
	    int i;

	    if (traceInstructions) {
		strncpy(cmdNameBuf, TclGetString(objv[0]), 20);
		TRACE(("%u => call (implementation %s) ", objc, O2S(objPtr)));
	    } else {
		fprintf(stdout,
			"%d: (%u) invoking (using implementation %s) ",
			iPtr->numLevels, (unsigned)(pc - codePtr->codeStart),
			O2S(objPtr));
	    }
	    for (i = 0;  i < objc;  i++) {
		if (i < opnd) {
		    fprintf(stdout, "<");
		    TclPrintObject(stdout, objv[i], 15);
		    fprintf(stdout, ">");
		} else {
		    TclPrintObject(stdout, objv[i], 15);
		}
		fprintf(stdout, " ");
	    }
	    fprintf(stdout, "\n");
	    fflush(stdout);
	}
#endif /*TCL_COMPILE_DEBUG*/

	bcFramePtr->data.tebc.pc = (char *) pc;
	iPtr->cmdFramePtr = bcFramePtr;
	if (iPtr->flags & INTERP_DEBUG_FRAME) {
	    ArgumentBCEnter(interp, codePtr, TD, pc, objc, objv);
	}

	TclInitRewriteEnsemble(interp, opnd, 1, objv);

	{
	    Tcl_Obj *copyPtr = Tcl_NewListObj(objc - opnd + 1, NULL);

	    Tcl_ListObjAppendElement(NULL, copyPtr, objPtr);
	    Tcl_ListObjReplace(NULL, copyPtr, LIST_MAX, 0,
		    objc - opnd, objv + opnd);
	    Tcl_DecrRefCount(objPtr);
	    objPtr = copyPtr;
	}

	DECACHE_STACK_INFO();
	pc += 6;
	TEBC_YIELD();

	TclMarkTailcall(interp);
	TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL, NULL);
	Tcl_ListObjGetElements(NULL, objPtr, &objc, &objv);
	TclNRAddCallback(interp, TclNRReleaseValues, objPtr, NULL, NULL, NULL);
	return TclNREvalObjv(interp, objc, objv, TCL_EVAL_INVOKE, NULL);

    /*
     * -----------------------------------------------------------------
     *	   Start of INST_LOAD instructions.
     *
     * WARNING: more 'goto' here than your doctor recommended! The different
     * instructions set the value of some variables and then jump to some
     * common execution code.
     */

    case INST_LOAD_SCALAR1:
    instLoadScalar1:
	opnd = TclGetUInt1AtPtr(pc+1);
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u => ", opnd));
	if (TclIsVarDirectReadable(varPtr)) {
	    /*
	     * No errors, no traces: just get the value.
	     */

	    objResultPtr = varPtr->value.objPtr;
	    TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	    NEXT_INST_F(2, 0, 1);
	}
	pcAdjustment = 2;
	cleanup = 0;
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;
	goto doCallPtrGetVar;

    case INST_LOAD_SCALAR4:
	opnd = TclGetUInt4AtPtr(pc+1);
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u => ", opnd));
	if (TclIsVarDirectReadable(varPtr)) {
	    /*
	     * No errors, no traces: just get the value.
	     */

	    objResultPtr = varPtr->value.objPtr;
	    TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	    NEXT_INST_F(5, 0, 1);
	}
	pcAdjustment = 5;
	cleanup = 0;
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;
	goto doCallPtrGetVar;

    case INST_LOAD_ARRAY4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	goto doLoadArray;

    case INST_LOAD_ARRAY1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;

    doLoadArray:
	part1Ptr = NULL;
	part2Ptr = OBJ_AT_TOS;
	arrayPtr = LOCAL(opnd);
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	TRACE(("%u \"%.30s\" => ", opnd, O2S(part2Ptr)));
	if (TclIsVarArray(arrayPtr) && !ReadTraced(arrayPtr)) {
	    varPtr = VarHashFindVar(arrayPtr->value.tablePtr, part2Ptr);
	    if (varPtr && TclIsVarDirectReadable(varPtr)) {
		/*
		 * No errors, no traces: just get the value.
		 */

		objResultPtr = varPtr->value.objPtr;
		TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
		NEXT_INST_F(pcAdjustment, 1, 1);
	    }
	}
	varPtr = TclLookupArrayElement(interp, part1Ptr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "read", 0, 1, arrayPtr, opnd);
	if (varPtr == NULL) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	cleanup = 1;
	goto doCallPtrGetVar;

    case INST_LOAD_ARRAY_STK:
	cleanup = 2;
	part2Ptr = OBJ_AT_TOS;		/* element name */
	objPtr = OBJ_UNDER_TOS;		/* array name */
	TRACE(("\"%.30s(%.30s)\" => ", O2S(objPtr), O2S(part2Ptr)));
	goto doLoadStk;

    case INST_LOAD_STK:
    case INST_LOAD_SCALAR_STK:
	cleanup = 1;
	part2Ptr = NULL;
	objPtr = OBJ_AT_TOS;		/* variable name */
	TRACE(("\"%.30s\" => ", O2S(objPtr)));

    doLoadStk:
	part1Ptr = objPtr;
	varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "read", /*createPart1*/0, /*createPart2*/1,
		&arrayPtr);
	if (!varPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	if (TclIsVarDirectReadable2(varPtr, arrayPtr)) {
	    /*
	     * No errors, no traces: just get the value.
	     */

	    objResultPtr = varPtr->value.objPtr;
	    TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	    NEXT_INST_V(1, cleanup, 1);
	}
	pcAdjustment = 1;
	opnd = -1;

    doCallPtrGetVar:
	/*
	 * There are either errors or the variable is traced: call
	 * TclPtrGetVar to process fully.
	 */

	DECACHE_STACK_INFO();
	objResultPtr = TclPtrGetVar(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, TCL_LEAVE_ERR_MSG, opnd);
	CACHE_STACK_INFO();
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	NEXT_INST_V(pcAdjustment, cleanup, 1);

    /*
     *	   End of INST_LOAD instructions.
     * -----------------------------------------------------------------
     *	   Start of INST_STORE and related instructions.
     *
     * WARNING: more 'goto' here than your doctor recommended! The different
     * instructions set the value of some variables and then jump to somme
     * common execution code.
     */

    {
	int storeFlags, len;

    case INST_STORE_ARRAY4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	goto doStoreArrayDirect;

    case INST_STORE_ARRAY1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;

    doStoreArrayDirect:
	valuePtr = OBJ_AT_TOS;
	part2Ptr = OBJ_UNDER_TOS;
	arrayPtr = LOCAL(opnd);
	TRACE(("%u \"%.30s\" <- \"%.30s\" => ", opnd, O2S(part2Ptr),
		O2S(valuePtr)));
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	if (TclIsVarArray(arrayPtr) && !WriteTraced(arrayPtr)) {
	    varPtr = VarHashFindVar(arrayPtr->value.tablePtr, part2Ptr);
	    if (varPtr && TclIsVarDirectWritable(varPtr)) {
		tosPtr--;
		Tcl_DecrRefCount(OBJ_AT_TOS);
		OBJ_AT_TOS = valuePtr;
		goto doStoreVarDirect;
	    }
	}
	cleanup = 2;
	storeFlags = TCL_LEAVE_ERR_MSG;
	part1Ptr = NULL;
	goto doStoreArrayDirectFailed;

    case INST_STORE_SCALAR4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	goto doStoreScalarDirect;

    case INST_STORE_SCALAR1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;

    doStoreScalarDirect:
	valuePtr = OBJ_AT_TOS;
	varPtr = LOCAL(opnd);
	TRACE(("%u <- \"%.30s\" => ", opnd, O2S(valuePtr)));
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	if (!TclIsVarDirectWritable(varPtr)) {
	    storeFlags = TCL_LEAVE_ERR_MSG;
	    part1Ptr = NULL;
	    goto doStoreScalar;
	}

	/*
	 * No traces, no errors, plain 'set': we can safely inline. The value
	 * *will* be set to what's requested, so that the stack top remains
	 * pointing to the same Tcl_Obj.
	 */

    doStoreVarDirect:
	valuePtr = varPtr->value.objPtr;
	if (valuePtr != NULL) {
	    TclDecrRefCount(valuePtr);
	}
	objResultPtr = OBJ_AT_TOS;
	varPtr->value.objPtr = objResultPtr;
#ifndef TCL_COMPILE_DEBUG
	if (*(pc+pcAdjustment) == INST_POP) {
	    tosPtr--;
	    NEXT_INST_F((pcAdjustment+1), 0, 0);
	}
#else
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
#endif
	Tcl_IncrRefCount(objResultPtr);
	NEXT_INST_F(pcAdjustment, 0, 0);

    case INST_LAPPEND_STK:
	valuePtr = OBJ_AT_TOS; /* value to append */
	part2Ptr = NULL;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
		| TCL_LIST_ELEMENT);
	goto doStoreStk;

    case INST_LAPPEND_ARRAY_STK:
	valuePtr = OBJ_AT_TOS; /* value to append */
	part2Ptr = OBJ_UNDER_TOS;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
		| TCL_LIST_ELEMENT);
	goto doStoreStk;

    case INST_APPEND_STK:
	valuePtr = OBJ_AT_TOS; /* value to append */
	part2Ptr = NULL;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
	goto doStoreStk;

    case INST_APPEND_ARRAY_STK:
	valuePtr = OBJ_AT_TOS; /* value to append */
	part2Ptr = OBJ_UNDER_TOS;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
	goto doStoreStk;

    case INST_STORE_ARRAY_STK:
	valuePtr = OBJ_AT_TOS;
	part2Ptr = OBJ_UNDER_TOS;
	storeFlags = TCL_LEAVE_ERR_MSG;
	goto doStoreStk;

    case INST_STORE_STK:
    case INST_STORE_SCALAR_STK:
	valuePtr = OBJ_AT_TOS;
	part2Ptr = NULL;
	storeFlags = TCL_LEAVE_ERR_MSG;

    doStoreStk:
	objPtr = OBJ_AT_DEPTH(1 + (part2Ptr != NULL)); /* variable name */
	part1Ptr = objPtr;
#ifdef TCL_COMPILE_DEBUG
	if (part2Ptr == NULL) {
	    TRACE(("\"%.30s\" <- \"%.30s\" =>", O2S(part1Ptr),O2S(valuePtr)));
	} else {
	    TRACE(("\"%.30s(%.30s)\" <- \"%.30s\" => ",
		    O2S(part1Ptr), O2S(part2Ptr), O2S(valuePtr)));
	}
#endif
	varPtr = TclObjLookupVarEx(interp, objPtr,part2Ptr, TCL_LEAVE_ERR_MSG,
		"set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
	if (!varPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	cleanup = ((part2Ptr == NULL)? 2 : 3);
	pcAdjustment = 1;
	opnd = -1;
	goto doCallPtrSetVar;

    case INST_LAPPEND_ARRAY4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
		| TCL_LIST_ELEMENT);
	goto doStoreArray;

    case INST_LAPPEND_ARRAY1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
		| TCL_LIST_ELEMENT);
	goto doStoreArray;

    case INST_APPEND_ARRAY4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
	goto doStoreArray;

    case INST_APPEND_ARRAY1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
	goto doStoreArray;

    doStoreArray:
	valuePtr = OBJ_AT_TOS;
	part2Ptr = OBJ_UNDER_TOS;
	arrayPtr = LOCAL(opnd);
	TRACE(("%u \"%.30s\" <- \"%.30s\" => ", opnd, O2S(part2Ptr),
		O2S(valuePtr)));
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	cleanup = 2;
	part1Ptr = NULL;

    doStoreArrayDirectFailed:
	varPtr = TclLookupArrayElement(interp, part1Ptr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "set", 1, 1, arrayPtr, opnd);
	if (!varPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	goto doCallPtrSetVar;

    case INST_LAPPEND_SCALAR4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
		| TCL_LIST_ELEMENT);
	goto doStoreScalar;

    case INST_LAPPEND_SCALAR1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
		| TCL_LIST_ELEMENT);
	goto doStoreScalar;

    case INST_APPEND_SCALAR4:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
	goto doStoreScalar;

    case INST_APPEND_SCALAR1:
	opnd = TclGetUInt1AtPtr(pc+1);
	pcAdjustment = 2;
	storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
	goto doStoreScalar;

    doStoreScalar:
	valuePtr = OBJ_AT_TOS;
	varPtr = LOCAL(opnd);
	TRACE(("%u <- \"%.30s\" => ", opnd, O2S(valuePtr)));
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	cleanup = 1;
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;

    doCallPtrSetVar:
	DECACHE_STACK_INFO();
	objResultPtr = TclPtrSetVar(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, valuePtr, storeFlags, opnd);
	CACHE_STACK_INFO();
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
#ifndef TCL_COMPILE_DEBUG
	if (*(pc+pcAdjustment) == INST_POP) {
	    NEXT_INST_V((pcAdjustment+1), cleanup, 0);
	}
#endif
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	NEXT_INST_V(pcAdjustment, cleanup, 1);

    case INST_LAPPEND_LIST:
	opnd = TclGetUInt4AtPtr(pc+1);
	valuePtr = OBJ_AT_TOS;
	varPtr = LOCAL(opnd);
	cleanup = 1;
	pcAdjustment = 5;
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u <- \"%.30s\" => ", opnd, O2S(valuePtr)));
	if (TclListObjGetElements(interp, valuePtr, &objc, &objv)
		!= TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	if (TclIsVarDirectReadable(varPtr)
		&& TclIsVarDirectWritable(varPtr)) {
	    goto lappendListDirect;
	}
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;
	goto lappendListPtr;

    case INST_LAPPEND_LIST_ARRAY:
	opnd = TclGetUInt4AtPtr(pc+1);
	valuePtr = OBJ_AT_TOS;
	part1Ptr = NULL;
	part2Ptr = OBJ_UNDER_TOS;
	arrayPtr = LOCAL(opnd);
	cleanup = 2;
	pcAdjustment = 5;
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	TRACE(("%u \"%.30s\" \"%.30s\" => ",
		opnd, O2S(part2Ptr), O2S(valuePtr)));
	if (TclListObjGetElements(interp, valuePtr, &objc, &objv)
		!= TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	if (TclIsVarArray(arrayPtr) && !ReadTraced(arrayPtr)
		&& !WriteTraced(arrayPtr)) {
	    varPtr = VarHashFindVar(arrayPtr->value.tablePtr, part2Ptr);
	    if (varPtr && TclIsVarDirectReadable(varPtr)
		    && TclIsVarDirectWritable(varPtr)) {
		goto lappendListDirect;
	    }
	}
	varPtr = TclLookupArrayElement(interp, part1Ptr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "set", 1, 1, arrayPtr, opnd);
	if (varPtr == NULL) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	goto lappendListPtr;

    case INST_LAPPEND_LIST_ARRAY_STK:
	pcAdjustment = 1;
	cleanup = 3;
	valuePtr = OBJ_AT_TOS;
	part2Ptr = OBJ_UNDER_TOS;	/* element name */
	part1Ptr = OBJ_AT_DEPTH(2);	/* array name */
	TRACE(("\"%.30s(%.30s)\" \"%.30s\" => ",
		O2S(part1Ptr), O2S(part2Ptr), O2S(valuePtr)));
	goto lappendList;

    case INST_LAPPEND_LIST_STK:
	pcAdjustment = 1;
	cleanup = 2;
	valuePtr = OBJ_AT_TOS;
	part2Ptr = NULL;
	part1Ptr = OBJ_UNDER_TOS;	/* variable name */
	TRACE(("\"%.30s\" \"%.30s\" => ", O2S(part1Ptr), O2S(valuePtr)));
	goto lappendList;

    lappendListDirect:
	objResultPtr = varPtr->value.objPtr;
	if (TclListObjLength(interp, objResultPtr, &len) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	if (Tcl_IsShared(objResultPtr)) {
	    Tcl_Obj *newValue = Tcl_DuplicateObj(objResultPtr);

	    TclDecrRefCount(objResultPtr);
	    varPtr->value.objPtr = objResultPtr = newValue;
	    Tcl_IncrRefCount(newValue);
	}
	if (Tcl_ListObjReplace(interp, objResultPtr, len, 0, objc, objv)
		!= TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	NEXT_INST_V(pcAdjustment, cleanup, 1);

    lappendList:
	opnd = -1;
	if (TclListObjGetElements(interp, valuePtr, &objc, &objv)
		!= TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	DECACHE_STACK_INFO();
	varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "set", 1, 1, &arrayPtr);
	CACHE_STACK_INFO();
	if (!varPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

    lappendListPtr:
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)++;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)++;
	}
	DECACHE_STACK_INFO();
	objResultPtr = TclPtrGetVar(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, TCL_LEAVE_ERR_MSG, opnd);
	CACHE_STACK_INFO();
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)--;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)--;
	}

	{
	    int createdNewObj = 0;

	    if (!objResultPtr) {
		objResultPtr = valuePtr;
	    } else if (TclListObjLength(interp, objResultPtr, &len)!=TCL_OK) {
		TRACE_ERROR(interp);
		goto gotError;
	    } else {
		if (Tcl_IsShared(objResultPtr)) {
		    objResultPtr = Tcl_DuplicateObj(objResultPtr);
		    createdNewObj = 1;
		}
		if (Tcl_ListObjReplace(interp, objResultPtr, len,0, objc,objv)
			!= TCL_OK) {
		    goto errorInLappendListPtr;
		}
	    }
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr,
		    part2Ptr, objResultPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (!objResultPtr) {
	    errorInLappendListPtr:
		if (createdNewObj) {
		    TclDecrRefCount(objResultPtr);
		}
		TRACE_ERROR(interp);
		goto gotError;
	    }
	}
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	NEXT_INST_V(pcAdjustment, cleanup, 1);
    }

    /*
     *	   End of INST_STORE and related instructions.
     * -----------------------------------------------------------------
     *	   Start of INST_INCR instructions.
     *
     * WARNING: more 'goto' here than your doctor recommended! The different
     * instructions set the value of some variables and then jump to somme
     * common execution code.
     */

/*TODO: Consider more untangling here; merge with LOAD and STORE ? */

    {
	Tcl_Obj *incrPtr;
#ifndef TCL_WIDE_INT_IS_LONG
	Tcl_WideInt w;
#endif
	long increment;

    case INST_INCR_SCALAR1:
    case INST_INCR_ARRAY1:
    case INST_INCR_ARRAY_STK:
    case INST_INCR_SCALAR_STK:
    case INST_INCR_STK:
	opnd = TclGetUInt1AtPtr(pc+1);
	incrPtr = POP_OBJECT();
	switch (*pc) {
	case INST_INCR_SCALAR1:
	    pcAdjustment = 2;
	    goto doIncrScalar;
	case INST_INCR_ARRAY1:
	    pcAdjustment = 2;
	    goto doIncrArray;
	default:
	    pcAdjustment = 1;
	    goto doIncrStk;
	}

    case INST_INCR_ARRAY_STK_IMM:
    case INST_INCR_SCALAR_STK_IMM:
    case INST_INCR_STK_IMM:
	increment = TclGetInt1AtPtr(pc+1);
	incrPtr = Tcl_NewIntObj(increment);
	Tcl_IncrRefCount(incrPtr);
	pcAdjustment = 2;

    doIncrStk:
	if ((*pc == INST_INCR_ARRAY_STK_IMM)
		|| (*pc == INST_INCR_ARRAY_STK)) {
	    part2Ptr = OBJ_AT_TOS;
	    objPtr = OBJ_UNDER_TOS;
	    TRACE(("\"%.30s(%.30s)\" (by %ld) => ",
		    O2S(objPtr), O2S(part2Ptr), increment));
	} else {
	    part2Ptr = NULL;
	    objPtr = OBJ_AT_TOS;
	    TRACE(("\"%.30s\" (by %ld) => ", O2S(objPtr), increment));
	}
	part1Ptr = objPtr;
	opnd = -1;
	varPtr = TclObjLookupVarEx(interp, objPtr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "read", 1, 1, &arrayPtr);
	if (!varPtr) {
	    DECACHE_STACK_INFO();
	    Tcl_AddErrorInfo(interp,
		    "\n    (reading value of variable to increment)");
	    CACHE_STACK_INFO();
	    TRACE_ERROR(interp);
	    Tcl_DecrRefCount(incrPtr);
	    goto gotError;
	}
	cleanup = ((part2Ptr == NULL)? 1 : 2);
	goto doIncrVar;

    case INST_INCR_ARRAY1_IMM:
	opnd = TclGetUInt1AtPtr(pc+1);
	increment = TclGetInt1AtPtr(pc+2);
	incrPtr = Tcl_NewIntObj(increment);
	Tcl_IncrRefCount(incrPtr);
	pcAdjustment = 3;

    doIncrArray:
	part1Ptr = NULL;
	part2Ptr = OBJ_AT_TOS;
	arrayPtr = LOCAL(opnd);
	cleanup = 1;
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	TRACE(("%u \"%.30s\" (by %ld) => ", opnd, O2S(part2Ptr), increment));
	varPtr = TclLookupArrayElement(interp, part1Ptr, part2Ptr,
		TCL_LEAVE_ERR_MSG, "read", 1, 1, arrayPtr, opnd);
	if (!varPtr) {
	    TRACE_ERROR(interp);
	    Tcl_DecrRefCount(incrPtr);
	    goto gotError;
	}
	goto doIncrVar;

    case INST_INCR_SCALAR1_IMM:
	opnd = TclGetUInt1AtPtr(pc+1);
	increment = TclGetInt1AtPtr(pc+2);
	pcAdjustment = 3;
	cleanup = 0;
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}

	if (TclIsVarDirectModifyable(varPtr)) {
	    ClientData ptr;
	    int type;

	    objPtr = varPtr->value.objPtr;
	    if (GetNumberFromObj(NULL, objPtr, &ptr, &type) == TCL_OK) {
		if (type == TCL_NUMBER_LONG) {
		    long augend = *((const long *)ptr);
		    long sum = augend + increment;

		    /*
		     * Overflow when (augend and sum have different sign) and
		     * (augend and increment have the same sign). This is
		     * encapsulated in the Overflowing macro.
		     */

		    if (!Overflowing(augend, increment, sum)) {
			TRACE(("%u %ld => ", opnd, increment));
			if (Tcl_IsShared(objPtr)) {
			    objPtr->refCount--;	/* We know it's shared. */
			    TclNewLongObj(objResultPtr, sum);
			    Tcl_IncrRefCount(objResultPtr);
			    varPtr->value.objPtr = objResultPtr;
			} else {
			    objResultPtr = objPtr;
			    TclSetLongObj(objPtr, sum);
			}
			goto doneIncr;
		    }
#ifndef TCL_WIDE_INT_IS_LONG
		    w = (Tcl_WideInt)augend;

		    TRACE(("%u %ld => ", opnd, increment));
		    if (Tcl_IsShared(objPtr)) {
			objPtr->refCount--;	/* We know it's shared. */
			objResultPtr = Tcl_NewWideIntObj(w+increment);
			Tcl_IncrRefCount(objResultPtr);
			varPtr->value.objPtr = objResultPtr;
		    } else {
			objResultPtr = objPtr;

			/*
			 * We know the sum value is outside the long range;
			 * use macro form that doesn't range test again.
			 */

			TclSetWideIntObj(objPtr, w+increment);
		    }
		    goto doneIncr;
#endif
		}	/* end if (type == TCL_NUMBER_LONG) */
#ifndef TCL_WIDE_INT_IS_LONG
		if (type == TCL_NUMBER_WIDE) {
		    Tcl_WideInt sum;

		    w = *((const Tcl_WideInt *) ptr);
		    sum = w + increment;

		    /*
		     * Check for overflow.
		     */

		    if (!Overflowing(w, increment, sum)) {
			TRACE(("%u %ld => ", opnd, increment));
			if (Tcl_IsShared(objPtr)) {
			    objPtr->refCount--;	/* We know it's shared. */
			    objResultPtr = Tcl_NewWideIntObj(sum);
			    Tcl_IncrRefCount(objResultPtr);
			    varPtr->value.objPtr = objResultPtr;
			} else {
			    objResultPtr = objPtr;

			    /*
			     * We *do not* know the sum value is outside the
			     * long range (wide + long can yield long); use
			     * the function call that checks range.
			     */

			    Tcl_SetWideIntObj(objPtr, sum);
			}
			goto doneIncr;
		    }
		}
#endif
	    }
	    if (Tcl_IsShared(objPtr)) {
		objPtr->refCount--;	/* We know it's shared */
		objResultPtr = Tcl_DuplicateObj(objPtr);
		Tcl_IncrRefCount(objResultPtr);
		varPtr->value.objPtr = objResultPtr;
	    } else {
		objResultPtr = objPtr;
	    }
	    TclNewLongObj(incrPtr, increment);
	    if (TclIncrObj(interp, objResultPtr, incrPtr) != TCL_OK) {
		Tcl_DecrRefCount(incrPtr);
		TRACE_ERROR(interp);
		goto gotError;
	    }
	    Tcl_DecrRefCount(incrPtr);
	    goto doneIncr;
	}

	/*
	 * All other cases, flow through to generic handling.
	 */

	TclNewLongObj(incrPtr, increment);
	Tcl_IncrRefCount(incrPtr);

    doIncrScalar:
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;
	cleanup = 0;
	TRACE(("%u %s => ", opnd, Tcl_GetString(incrPtr)));

    doIncrVar:
	if (TclIsVarDirectModifyable2(varPtr, arrayPtr)) {
	    objPtr = varPtr->value.objPtr;
	    if (Tcl_IsShared(objPtr)) {
		objPtr->refCount--;	/* We know it's shared */
		objResultPtr = Tcl_DuplicateObj(objPtr);
		Tcl_IncrRefCount(objResultPtr);
		varPtr->value.objPtr = objResultPtr;
	    } else {
		objResultPtr = objPtr;
	    }
	    if (TclIncrObj(interp, objResultPtr, incrPtr) != TCL_OK) {
		Tcl_DecrRefCount(incrPtr);
		TRACE_ERROR(interp);
		goto gotError;
	    }
	    Tcl_DecrRefCount(incrPtr);
	} else {
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrIncrObjVar(interp, varPtr, arrayPtr,
		    part1Ptr, part2Ptr, incrPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    Tcl_DecrRefCount(incrPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
	}
    doneIncr:
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
#ifndef TCL_COMPILE_DEBUG
	if (*(pc+pcAdjustment) == INST_POP) {
	    NEXT_INST_V((pcAdjustment+1), cleanup, 0);
	}
#endif
	NEXT_INST_V(pcAdjustment, cleanup, 1);
    }

    /*
     *	   End of INST_INCR instructions.
     * -----------------------------------------------------------------
     *	   Start of INST_EXIST instructions.
     */

    case INST_EXIST_SCALAR:
	cleanup = 0;
	pcAdjustment = 5;
	opnd = TclGetUInt4AtPtr(pc+1);
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u => ", opnd));
	if (ReadTraced(varPtr)) {
	    DECACHE_STACK_INFO();
	    TclObjCallVarTraces(iPtr, NULL, varPtr, NULL, NULL,
		    TCL_TRACE_READS, 0, opnd);
	    CACHE_STACK_INFO();
	    if (TclIsVarUndefined(varPtr)) {
		TclCleanupVar(varPtr, NULL);
		varPtr = NULL;
	    }
	}
	goto afterExistsPeephole;

    case INST_EXIST_ARRAY:
	cleanup = 1;
	pcAdjustment = 5;
	opnd = TclGetUInt4AtPtr(pc+1);
	part2Ptr = OBJ_AT_TOS;
	arrayPtr = LOCAL(opnd);
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	TRACE(("%u \"%.30s\" => ", opnd, O2S(part2Ptr)));
	if (TclIsVarArray(arrayPtr) && !ReadTraced(arrayPtr)) {
	    varPtr = VarHashFindVar(arrayPtr->value.tablePtr, part2Ptr);
	    if (!varPtr || !ReadTraced(varPtr)) {
		goto afterExistsPeephole;
	    }
	}
	varPtr = TclLookupArrayElement(interp, NULL, part2Ptr, 0, "access",
		0, 1, arrayPtr, opnd);
	if (varPtr) {
	    if (ReadTraced(varPtr) || (arrayPtr && ReadTraced(arrayPtr))) {
		DECACHE_STACK_INFO();
		TclObjCallVarTraces(iPtr, arrayPtr, varPtr, NULL, part2Ptr,
			TCL_TRACE_READS, 0, opnd);
		CACHE_STACK_INFO();
	    }
	    if (TclIsVarUndefined(varPtr)) {
		TclCleanupVar(varPtr, arrayPtr);
		varPtr = NULL;
	    }
	}
	goto afterExistsPeephole;

    case INST_EXIST_ARRAY_STK:
	cleanup = 2;
	pcAdjustment = 1;
	part2Ptr = OBJ_AT_TOS;		/* element name */
	part1Ptr = OBJ_UNDER_TOS;	/* array name */
	TRACE(("\"%.30s(%.30s)\" => ", O2S(part1Ptr), O2S(part2Ptr)));
	goto doExistStk;

    case INST_EXIST_STK:
	cleanup = 1;
	pcAdjustment = 1;
	part2Ptr = NULL;
	part1Ptr = OBJ_AT_TOS;		/* variable name */
	TRACE(("\"%.30s\" => ", O2S(part1Ptr)));

    doExistStk:
	varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, 0, "access",
		/*createPart1*/0, /*createPart2*/1, &arrayPtr);
	if (varPtr) {
	    if (ReadTraced(varPtr) || (arrayPtr && ReadTraced(arrayPtr))) {
		DECACHE_STACK_INFO();
		TclObjCallVarTraces(iPtr, arrayPtr, varPtr, part1Ptr,part2Ptr,
			TCL_TRACE_READS, 0, -1);
		CACHE_STACK_INFO();
	    }
	    if (TclIsVarUndefined(varPtr)) {
		TclCleanupVar(varPtr, arrayPtr);
		varPtr = NULL;
	    }
	}

	/*
	 * Peep-hole optimisation: if you're about to jump, do jump from here.
	 */

    afterExistsPeephole: {
	int found = (varPtr && !TclIsVarUndefined(varPtr));

	TRACE_APPEND(("%d\n", found ? 1 : 0));
	JUMP_PEEPHOLE_V(found, pcAdjustment, cleanup);
    }

    /*
     *	   End of INST_EXIST instructions.
     * -----------------------------------------------------------------
     *	   Start of INST_UNSET instructions.
     */

    {
	int flags;

    case INST_UNSET_SCALAR:
	flags = TclGetUInt1AtPtr(pc+1) ? TCL_LEAVE_ERR_MSG : 0;
	opnd = TclGetUInt4AtPtr(pc+2);
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%s %u => ", (flags ? "normal" : "noerr"), opnd));
	if (TclIsVarDirectUnsettable(varPtr) && !TclIsVarInHash(varPtr)) {
	    /*
	     * No errors, no traces, no searches: just make the variable cease
	     * to exist.
	     */

	    if (!TclIsVarUndefined(varPtr)) {
		TclDecrRefCount(varPtr->value.objPtr);
	    } else if (flags & TCL_LEAVE_ERR_MSG) {
		goto slowUnsetScalar;
	    }
	    varPtr->value.objPtr = NULL;
	    TRACE_APPEND(("OK\n"));
	    NEXT_INST_F(6, 0, 0);
	}

    slowUnsetScalar:
	DECACHE_STACK_INFO();
	if (TclPtrUnsetVar(interp, varPtr, NULL, NULL, NULL, flags,
		opnd) != TCL_OK && flags) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	NEXT_INST_F(6, 0, 0);

    case INST_UNSET_ARRAY:
	flags = TclGetUInt1AtPtr(pc+1) ? TCL_LEAVE_ERR_MSG : 0;
	opnd = TclGetUInt4AtPtr(pc+2);
	part2Ptr = OBJ_AT_TOS;
	arrayPtr = LOCAL(opnd);
	while (TclIsVarLink(arrayPtr)) {
	    arrayPtr = arrayPtr->value.linkPtr;
	}
	TRACE(("%s %u \"%.30s\" => ",
		(flags ? "normal" : "noerr"), opnd, O2S(part2Ptr)));
	if (TclIsVarArray(arrayPtr) && !UnsetTraced(arrayPtr)) {
	    varPtr = VarHashFindVar(arrayPtr->value.tablePtr, part2Ptr);
	    if (varPtr && TclIsVarDirectUnsettable(varPtr)) {
		/*
		 * No nasty traces and element exists, so we can proceed to
		 * unset it. Might still not exist though...
		 */

		if (!TclIsVarUndefined(varPtr)) {
		    TclDecrRefCount(varPtr->value.objPtr);
		    TclSetVarUndefined(varPtr);
		    TclClearVarNamespaceVar(varPtr);
		    TclCleanupVar(varPtr, arrayPtr);
		} else if (flags & TCL_LEAVE_ERR_MSG) {
		    goto slowUnsetArray;
		}
		TRACE_APPEND(("OK\n"));
		NEXT_INST_F(6, 1, 0);
	    } else if (!varPtr && !(flags & TCL_LEAVE_ERR_MSG)) {
		/*
		 * Don't need to do anything here.
		 */

		TRACE_APPEND(("OK\n"));
		NEXT_INST_F(6, 1, 0);
	    }
	}
    slowUnsetArray:
	DECACHE_STACK_INFO();
	varPtr = TclLookupArrayElement(interp, NULL, part2Ptr, flags, "unset",
		0, 0, arrayPtr, opnd);
	if (!varPtr) {
	    if (flags & TCL_LEAVE_ERR_MSG) {
		goto errorInUnset;
	    }
	} else if (TclPtrUnsetVar(interp, varPtr, arrayPtr, NULL, part2Ptr,
		flags, opnd) != TCL_OK && (flags & TCL_LEAVE_ERR_MSG)) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	NEXT_INST_F(6, 1, 0);

    case INST_UNSET_ARRAY_STK:
	flags = TclGetUInt1AtPtr(pc+1) ? TCL_LEAVE_ERR_MSG : 0;
	cleanup = 2;
	part2Ptr = OBJ_AT_TOS;		/* element name */
	part1Ptr = OBJ_UNDER_TOS;	/* array name */
	TRACE(("%s \"%.30s(%.30s)\" => ", (flags ? "normal" : "noerr"),
		O2S(part1Ptr), O2S(part2Ptr)));
	goto doUnsetStk;

    case INST_UNSET_STK:
	flags = TclGetUInt1AtPtr(pc+1) ? TCL_LEAVE_ERR_MSG : 0;
	cleanup = 1;
	part2Ptr = NULL;
	part1Ptr = OBJ_AT_TOS;		/* variable name */
	TRACE(("%s \"%.30s\" => ", (flags ? "normal" : "noerr"),
		O2S(part1Ptr)));

    doUnsetStk:
	DECACHE_STACK_INFO();
	if (TclObjUnsetVar2(interp, part1Ptr, part2Ptr, flags) != TCL_OK
		&& (flags & TCL_LEAVE_ERR_MSG)) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	TRACE_APPEND(("OK\n"));
	NEXT_INST_V(2, cleanup, 0);

    errorInUnset:
	CACHE_STACK_INFO();
	TRACE_ERROR(interp);
	goto gotError;

	/*
	 * This is really an unset operation these days. Do not issue.
	 */

    case INST_DICT_DONE:
	opnd = TclGetUInt4AtPtr(pc+1);
	TRACE(("%u => OK\n", opnd));
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	if (TclIsVarDirectUnsettable(varPtr) && !TclIsVarInHash(varPtr)) {
	    if (!TclIsVarUndefined(varPtr)) {
		TclDecrRefCount(varPtr->value.objPtr);
	    }
	    varPtr->value.objPtr = NULL;
	} else {
	    DECACHE_STACK_INFO();
	    TclPtrUnsetVar(interp, varPtr, NULL, NULL, NULL, 0, opnd);
	    CACHE_STACK_INFO();
	}
	NEXT_INST_F(5, 0, 0);
    }

    /*
     *	   End of INST_UNSET instructions.
     * -----------------------------------------------------------------
     *	   Start of INST_ARRAY instructions.
     */

    case INST_ARRAY_EXISTS_IMM:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	cleanup = 0;
	part1Ptr = NULL;
	arrayPtr = NULL;
	TRACE(("%u => ", opnd));
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	goto doArrayExists;
    case INST_ARRAY_EXISTS_STK:
	opnd = -1;
	pcAdjustment = 1;
	cleanup = 1;
	part1Ptr = OBJ_AT_TOS;
	TRACE(("\"%.30s\" => ", O2S(part1Ptr)));
	varPtr = TclObjLookupVarEx(interp, part1Ptr, NULL, 0, NULL,
		/*createPart1*/0, /*createPart2*/0, &arrayPtr);
    doArrayExists:
	if (varPtr && (varPtr->flags & VAR_TRACED_ARRAY)
		&& (TclIsVarArray(varPtr) || TclIsVarUndefined(varPtr))) {
	    DECACHE_STACK_INFO();
	    result = TclObjCallVarTraces(iPtr, arrayPtr, varPtr, part1Ptr,
		    NULL, (TCL_LEAVE_ERR_MSG|TCL_NAMESPACE_ONLY|
		    TCL_GLOBAL_ONLY|TCL_TRACE_ARRAY), 1, opnd);
	    CACHE_STACK_INFO();
	    if (result == TCL_ERROR) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
	}
	if (varPtr && TclIsVarArray(varPtr) && !TclIsVarUndefined(varPtr)) {
	    objResultPtr = TCONST(1);
	} else {
	    objResultPtr = TCONST(0);
	}
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	NEXT_INST_V(pcAdjustment, cleanup, 1);

    case INST_ARRAY_MAKE_IMM:
	opnd = TclGetUInt4AtPtr(pc+1);
	pcAdjustment = 5;
	cleanup = 0;
	part1Ptr = NULL;
	arrayPtr = NULL;
	TRACE(("%u => ", opnd));
	varPtr = LOCAL(opnd);
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	goto doArrayMake;
    case INST_ARRAY_MAKE_STK:
	opnd = -1;
	pcAdjustment = 1;
	cleanup = 1;
	part1Ptr = OBJ_AT_TOS;
	TRACE(("\"%.30s\" => ", O2S(part1Ptr)));
	varPtr = TclObjLookupVarEx(interp, part1Ptr, NULL, TCL_LEAVE_ERR_MSG,
		"set", /*createPart1*/1, /*createPart2*/0, &arrayPtr);
	if (varPtr == NULL) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
    doArrayMake:
	if (varPtr && !TclIsVarArray(varPtr)) {
	    if (TclIsVarArrayElement(varPtr) || !TclIsVarUndefined(varPtr)) {
		/*
		 * Either an array element, or a scalar: lose!
		 */

		TclObjVarErrMsg(interp, part1Ptr, NULL, "array set",
			"variable isn't array", opnd);
		DECACHE_STACK_INFO();
		Tcl_SetErrorCode(interp, "TCL", "WRITE", "ARRAY", NULL);
		CACHE_STACK_INFO();
		TRACE_ERROR(interp);
		goto gotError;
	    }
	    TclSetVarArray(varPtr);
	    varPtr->value.tablePtr = ckalloc(sizeof(TclVarHashTable));
	    TclInitVarHashTable(varPtr->value.tablePtr,
		    TclGetVarNsPtr(varPtr));
#ifdef TCL_COMPILE_DEBUG
	    TRACE_APPEND(("done\n"));
	} else {
	    TRACE_APPEND(("nothing to do\n"));
#endif
	}
	NEXT_INST_V(pcAdjustment, cleanup, 0);

    /*
     *	   End of INST_ARRAY instructions.
     * -----------------------------------------------------------------
     *	   Start of variable linking instructions.
     */

    {
	Var *otherPtr;
	CallFrame *framePtr, *savedFramePtr;
	Tcl_Namespace *nsPtr;
	Namespace *savedNsPtr;

    case INST_UPVAR:
	TRACE(("%d %.30s %.30s => ", TclGetInt4AtPtr(pc+1),
		O2S(OBJ_UNDER_TOS), O2S(OBJ_AT_TOS)));

	if (TclObjGetFrame(interp, OBJ_UNDER_TOS, &framePtr) == -1) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Locate the other variable.
	 */

	savedFramePtr = iPtr->varFramePtr;
	iPtr->varFramePtr = framePtr;
	otherPtr = TclObjLookupVarEx(interp, OBJ_AT_TOS, NULL,
		TCL_LEAVE_ERR_MSG, "access", /*createPart1*/ 1,
		/*createPart2*/ 1, &varPtr);
	iPtr->varFramePtr = savedFramePtr;
	if (!otherPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	goto doLinkVars;

    case INST_NSUPVAR:
	TRACE(("%d %.30s %.30s => ", TclGetInt4AtPtr(pc+1),
		O2S(OBJ_UNDER_TOS), O2S(OBJ_AT_TOS)));
	if (TclGetNamespaceFromObj(interp, OBJ_UNDER_TOS, &nsPtr) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Locate the other variable.
	 */

	savedNsPtr = iPtr->varFramePtr->nsPtr;
	iPtr->varFramePtr->nsPtr = (Namespace *) nsPtr;
	otherPtr = TclObjLookupVarEx(interp, OBJ_AT_TOS, NULL,
		(TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG|TCL_AVOID_RESOLVERS),
		"access", /*createPart1*/ 1, /*createPart2*/ 1, &varPtr);
	iPtr->varFramePtr->nsPtr = savedNsPtr;
	if (!otherPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	goto doLinkVars;

    case INST_VARIABLE:
	TRACE(("%d, %.30s => ", TclGetInt4AtPtr(pc+1), O2S(OBJ_AT_TOS)));
	otherPtr = TclObjLookupVarEx(interp, OBJ_AT_TOS, NULL,
		(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), "access",
		/*createPart1*/ 1, /*createPart2*/ 1, &varPtr);
	if (!otherPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Do the [variable] magic.
	 */

	TclSetVarNamespaceVar(otherPtr);

    doLinkVars:

	/*
	 * If we are here, the local variable has already been created: do the
	 * little work of TclPtrMakeUpvar that remains to be done right here
	 * if there are no errors; otherwise, let it handle the case.
	 */

	opnd = TclGetInt4AtPtr(pc+1);
	varPtr = LOCAL(opnd);
	if ((varPtr != otherPtr) && !TclIsVarTraced(varPtr)
		&& (TclIsVarUndefined(varPtr) || TclIsVarLink(varPtr))) {
	    if (!TclIsVarUndefined(varPtr)) {
		/*
		 * Then it is a defined link.
		 */

		Var *linkPtr = varPtr->value.linkPtr;

		if (linkPtr == otherPtr) {
		    TRACE_APPEND(("already linked\n"));
		    NEXT_INST_F(5, 1, 0);
		}
		if (TclIsVarInHash(linkPtr)) {
		    VarHashRefCount(linkPtr)--;
		    if (TclIsVarUndefined(linkPtr)) {
			TclCleanupVar(linkPtr, NULL);
		    }
		}
	    }
	    TclSetVarLink(varPtr);
	    varPtr->value.linkPtr = otherPtr;
	    if (TclIsVarInHash(otherPtr)) {
		VarHashRefCount(otherPtr)++;
	    }
	} else if (TclPtrObjMakeUpvar(interp, otherPtr, NULL, 0,
		opnd) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Do not pop the namespace or frame index, it may be needed for other
	 * variables - and [variable] did not push it at all.
	 */

	TRACE_APPEND(("link made\n"));
	NEXT_INST_F(5, 1, 0);
    }

    /*
     *	   End of variable linking instructions.
     * -----------------------------------------------------------------
     */

    case INST_JUMP1:
	opnd = TclGetInt1AtPtr(pc+1);
	TRACE(("%d => new pc %u\n", opnd,
		(unsigned)(pc + opnd - codePtr->codeStart)));
	NEXT_INST_F(opnd, 0, 0);

    case INST_JUMP4:
	opnd = TclGetInt4AtPtr(pc+1);
	TRACE(("%d => new pc %u\n", opnd,
		(unsigned)(pc + opnd - codePtr->codeStart)));
	NEXT_INST_F(opnd, 0, 0);

    {
	int jmpOffset[2], b;

	/* TODO: consider rewrite so we don't compute the offset we're not
	 * going to take. */
    case INST_JUMP_FALSE4:
	jmpOffset[0] = TclGetInt4AtPtr(pc+1);	/* FALSE offset */
	jmpOffset[1] = 5;			/* TRUE offset */
	goto doCondJump;

    case INST_JUMP_TRUE4:
	jmpOffset[0] = 5;
	jmpOffset[1] = TclGetInt4AtPtr(pc+1);
	goto doCondJump;

    case INST_JUMP_FALSE1:
	jmpOffset[0] = TclGetInt1AtPtr(pc+1);
	jmpOffset[1] = 2;
	goto doCondJump;

    case INST_JUMP_TRUE1:
	jmpOffset[0] = 2;
	jmpOffset[1] = TclGetInt1AtPtr(pc+1);

    doCondJump:
	valuePtr = OBJ_AT_TOS;
	TRACE(("%d => ", jmpOffset[
		(*pc==INST_JUMP_FALSE1 || *pc==INST_JUMP_FALSE4) ? 0 : 1]));

	/* TODO - check claim that taking address of b harms performance */
	/* TODO - consider optimization search for constants */
	if (TclGetBooleanFromObj(interp, valuePtr, &b) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

#ifdef TCL_COMPILE_DEBUG
	if (b) {
	    if ((*pc == INST_JUMP_TRUE1) || (*pc == INST_JUMP_TRUE4)) {
		TRACE_APPEND(("%.20s true, new pc %u\n", O2S(valuePtr),
			(unsigned)(pc + jmpOffset[1] - codePtr->codeStart)));
	    } else {
		TRACE_APPEND(("%.20s true\n", O2S(valuePtr)));
	    }
	} else {
	    if ((*pc == INST_JUMP_TRUE1) || (*pc == INST_JUMP_TRUE4)) {
		TRACE_APPEND(("%.20s false\n", O2S(valuePtr)));
	    } else {
		TRACE_APPEND(("%.20s false, new pc %u\n", O2S(valuePtr),
			(unsigned)(pc + jmpOffset[0] - codePtr->codeStart)));
	    }
	}
#endif
	NEXT_INST_F(jmpOffset[b], 1, 0);
    }

    case INST_JUMP_TABLE: {
	Tcl_HashEntry *hPtr;
	JumptableInfo *jtPtr;

	/*
	 * Jump to location looked up in a hashtable; fall through to next
	 * instr if lookup fails.
	 */

	opnd = TclGetInt4AtPtr(pc+1);
	jtPtr = (JumptableInfo *) codePtr->auxDataArrayPtr[opnd].clientData;
	TRACE(("%d \"%.20s\" => ", opnd, O2S(OBJ_AT_TOS)));
	hPtr = Tcl_FindHashEntry(&jtPtr->hashTable, TclGetString(OBJ_AT_TOS));
	if (hPtr != NULL) {
	    int jumpOffset = PTR2INT(Tcl_GetHashValue(hPtr));

	    TRACE_APPEND(("found in table, new pc %u\n",
		    (unsigned)(pc - codePtr->codeStart + jumpOffset)));
	    NEXT_INST_F(jumpOffset, 1, 0);
	} else {
	    TRACE_APPEND(("not found in table\n"));
	    NEXT_INST_F(5, 1, 0);
	}
    }

    /*
     * These two instructions are now redundant: the complete logic of the LOR
     * and LAND is now handled by the expression compiler.
     */

    case INST_LOR:
    case INST_LAND: {
	/*
	 * Operands must be boolean or numeric. No int->double conversions are
	 * performed.
	 */

	int i1, i2, iResult;

	value2Ptr = OBJ_AT_TOS;
	valuePtr = OBJ_UNDER_TOS;
	if (TclGetBooleanFromObj(NULL, valuePtr, &i1) != TCL_OK) {
	    TRACE(("\"%.20s\" => ILLEGAL TYPE %s \n", O2S(valuePtr),
		    (valuePtr->typePtr? valuePtr->typePtr->name : "null")));
	    DECACHE_STACK_INFO();
	    IllegalExprOperandType(interp, pc, valuePtr);
	    CACHE_STACK_INFO();
	    goto gotError;
	}

	if (TclGetBooleanFromObj(NULL, value2Ptr, &i2) != TCL_OK) {
	    TRACE(("\"%.20s\" => ILLEGAL TYPE %s \n", O2S(value2Ptr),
		    (value2Ptr->typePtr? value2Ptr->typePtr->name : "null")));
	    DECACHE_STACK_INFO();
	    IllegalExprOperandType(interp, pc, value2Ptr);
	    CACHE_STACK_INFO();
	    goto gotError;
	}

	if (*pc == INST_LOR) {
	    iResult = (i1 || i2);
	} else {
	    iResult = (i1 && i2);
	}
	objResultPtr = TCONST(iResult);
	TRACE(("%.20s %.20s => %d\n", O2S(valuePtr),O2S(value2Ptr),iResult));
	NEXT_INST_F(1, 2, 1);
    }

    /*
     * -----------------------------------------------------------------
     *	   Start of general introspector instructions.
     */

    case INST_NS_CURRENT: {
	Namespace *currNsPtr = (Namespace *) TclGetCurrentNamespace(interp);

	if (currNsPtr == (Namespace *) TclGetGlobalNamespace(interp)) {
	    TclNewLiteralStringObj(objResultPtr, "::");
	} else {
	    TclNewStringObj(objResultPtr, currNsPtr->fullName,
		    strlen(currNsPtr->fullName));
	}
	TRACE_WITH_OBJ(("=> "), objResultPtr);
	NEXT_INST_F(1, 0, 1);
    }
    case INST_COROUTINE_NAME: {
	CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;

	TclNewObj(objResultPtr);
	if (corPtr && !(corPtr->cmdPtr->flags & CMD_IS_DELETED)) {
	    Tcl_GetCommandFullName(interp, (Tcl_Command) corPtr->cmdPtr,
		    objResultPtr);
	}
	TRACE_WITH_OBJ(("=> "), objResultPtr);
	NEXT_INST_F(1, 0, 1);
    }
    case INST_INFO_LEVEL_NUM:
	TclNewLongObj(objResultPtr, iPtr->varFramePtr->level);
	TRACE_WITH_OBJ(("=> "), objResultPtr);
	NEXT_INST_F(1, 0, 1);
    case INST_INFO_LEVEL_ARGS: {
	int level;
	register CallFrame *framePtr = iPtr->varFramePtr;
	register CallFrame *rootFramePtr = iPtr->rootFramePtr;

	TRACE(("\"%.30s\" => ", O2S(OBJ_AT_TOS)));
	if (TclGetIntFromObj(interp, OBJ_AT_TOS, &level) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	if (level <= 0) {
	    level += framePtr->level;
	}
	for (; (framePtr->level!=level) && (framePtr!=rootFramePtr) ;
		framePtr = framePtr->callerVarPtr) {
	    /* Empty loop body */
	}
	if (framePtr == rootFramePtr) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "bad level \"%s\"", TclGetString(OBJ_AT_TOS)));
	    TRACE_ERROR(interp);
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "STACK_LEVEL",
		    TclGetString(OBJ_AT_TOS), NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}
	objResultPtr = Tcl_NewListObj(framePtr->objc, framePtr->objv);
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
	NEXT_INST_F(1, 1, 1);
    }
    {
	Tcl_Command cmd, origCmd;

    case INST_RESOLVE_COMMAND:
	cmd = Tcl_GetCommandFromObj(interp, OBJ_AT_TOS);
	TclNewObj(objResultPtr);
	if (cmd != NULL) {
	    Tcl_GetCommandFullName(interp, cmd, objResultPtr);
	}
	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) {
	    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;
	}
	origCmd = TclGetOriginalCommand(cmd);
	if (origCmd == NULL) {
	    origCmd = cmd;
	}
	TclNewObj(objResultPtr);
	Tcl_GetCommandFullName(interp, origCmd, objResultPtr);
	TRACE_APPEND(("\"%.30s\"", O2S(OBJ_AT_TOS)));
	NEXT_INST_F(1, 1, 1);
    }

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

    {
	Object *oPtr;
	CallFrame *framePtr;
	CallContext *contextPtr;
	int skip, newDepth;

    case INST_TCLOO_SELF:
	framePtr = iPtr->varFramePtr;
	if (framePtr == NULL ||
		!(framePtr->isProcCallFrame & FRAME_IS_METHOD)) {
	    TRACE(("=> ERROR: no TclOO call context\n"));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "self may only be called from inside a method",
		    -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}
	contextPtr = framePtr->clientData;

	/*
	 * Call out to get the name; it's expensive to compute but cached.
	 */

	objResultPtr = TclOOObjectName(interp, contextPtr->oPtr);
	TRACE_WITH_OBJ(("=> "), objResultPtr);
	NEXT_INST_F(1, 0, 1);

    case INST_TCLOO_NEXT_CLASS:
	opnd = TclGetUInt1AtPtr(pc+1);
	framePtr = iPtr->varFramePtr;
	valuePtr = OBJ_AT_DEPTH(opnd - 2);
	objv = &OBJ_AT_DEPTH(opnd - 1);
	skip = 2;
	TRACE(("%d => ", opnd));
	if (framePtr == NULL ||
		!(framePtr->isProcCallFrame & FRAME_IS_METHOD)) {
	    TRACE_APPEND(("ERROR: no TclOO call context\n"));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "nextto may only be called from inside a method",
		    -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}
	contextPtr = framePtr->clientData;

	oPtr = (Object *) Tcl_GetObjectFromObj(interp, valuePtr);
	if (oPtr == NULL) {
	    TRACE_APPEND(("ERROR: \"%.30s\" not object\n", O2S(valuePtr)));
	    goto gotError;
	} else {
	    Class *classPtr = oPtr->classPtr;
	    struct MInvoke *miPtr;
	    int i;
	    const char *methodType;

	    if (classPtr == NULL) {
		TRACE_APPEND(("ERROR: \"%.30s\" not class\n", O2S(valuePtr)));
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"\"%s\" is not a class", TclGetString(valuePtr)));
		DECACHE_STACK_INFO();
		Tcl_SetErrorCode(interp, "TCL", "OO", "CLASS_REQUIRED", NULL);
		CACHE_STACK_INFO();
		goto gotError;
	    }

	    for (i=contextPtr->index+1 ; i<contextPtr->callPtr->numChain ; i++) {
		miPtr = contextPtr->callPtr->chain + i;
		if (!miPtr->isFilter &&
			miPtr->mPtr->declaringClassPtr == classPtr) {
		    newDepth = i;
#ifdef TCL_COMPILE_DEBUG
		    if (tclTraceExec >= 2) {
			if (traceInstructions) {
			    strncpy(cmdNameBuf, TclGetString(objv[0]), 20);
			} else {
			    fprintf(stdout, "%d: (%u) invoking ",
				    iPtr->numLevels,
				    (unsigned)(pc - codePtr->codeStart));
			}
			for (i = 0;  i < opnd;  i++) {
			    TclPrintObject(stdout, objv[i], 15);
			    fprintf(stdout, " ");
			}
			fprintf(stdout, "\n");
			fflush(stdout);
		    }
#endif /*TCL_COMPILE_DEBUG*/
		    goto doInvokeNext;
		}
	    }

	    if (contextPtr->callPtr->flags & CONSTRUCTOR) {
		methodType = "constructor";
	    } else if (contextPtr->callPtr->flags & DESTRUCTOR) {
		methodType = "destructor";
	    } else {
		methodType = "method";
	    }

	    TRACE_APPEND(("ERROR: \"%.30s\" not on reachable chain\n",
		    O2S(valuePtr)));
	    for (i=contextPtr->index ; i>=0 ; i--) {
		miPtr = contextPtr->callPtr->chain + i;
		if (miPtr->isFilter
			|| miPtr->mPtr->declaringClassPtr != classPtr) {
		    continue;
		}
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"%s implementation by \"%s\" not reachable from here",
			methodType, TclGetString(valuePtr)));
		DECACHE_STACK_INFO();
		Tcl_SetErrorCode(interp, "TCL", "OO", "CLASS_NOT_REACHABLE",
			NULL);
		CACHE_STACK_INFO();
		goto gotError;
	    }
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "%s has no non-filter implementation by \"%s\"",
		    methodType, TclGetString(valuePtr)));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "OO", "CLASS_NOT_THERE", NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}

    case INST_TCLOO_NEXT:
	opnd = TclGetUInt1AtPtr(pc+1);
	objv = &OBJ_AT_DEPTH(opnd - 1);
	framePtr = iPtr->varFramePtr;
	skip = 1;
	TRACE(("%d => ", opnd));
	if (framePtr == NULL ||
		!(framePtr->isProcCallFrame & FRAME_IS_METHOD)) {
	    TRACE_APPEND(("ERROR: no TclOO call context\n"));
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "next may only be called from inside a method",
		    -1));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
	}
	contextPtr = framePtr->clientData;

	newDepth = contextPtr->index + 1;
	if (newDepth >= 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 (contextPtr->callPtr->flags & CONSTRUCTOR) {
		methodType = "constructor";
	    } else if (contextPtr->callPtr->flags & DESTRUCTOR) {
		methodType = "destructor";
	    } else {
		methodType = "method";
	    }

	    TRACE_APPEND(("ERROR: no TclOO next impl\n"));
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "no next %s implementation", methodType));
	    DECACHE_STACK_INFO();
	    Tcl_SetErrorCode(interp, "TCL", "OO", "NOTHING_NEXT", NULL);
	    CACHE_STACK_INFO();
	    goto gotError;
#ifdef TCL_COMPILE_DEBUG
	} else if (tclTraceExec >= 2) {
	    int i;

	    if (traceInstructions) {
		strncpy(cmdNameBuf, TclGetString(objv[0]), 20);
	    } else {
		fprintf(stdout, "%d: (%u) invoking ",
			iPtr->numLevels, (unsigned)(pc - codePtr->codeStart));
	    }
	    for (i = 0;  i < opnd;  i++) {
		TclPrintObject(stdout, objv[i], 15);
		fprintf(stdout, " ");
	    }
	    fprintf(stdout, "\n");
	    fflush(stdout);
#endif /*TCL_COMPILE_DEBUG*/
	}

    doInvokeNext:
	bcFramePtr->data.tebc.pc = (char *) pc;
	iPtr->cmdFramePtr = bcFramePtr;

	if (iPtr->flags & INTERP_DEBUG_FRAME) {
	    ArgumentBCEnter(interp, codePtr, TD, pc, opnd, objv);
	}

	pcAdjustment = 2;
	cleanup = opnd;
	DECACHE_STACK_INFO();
	iPtr->varFramePtr = framePtr->callerVarPtr;
	pc += pcAdjustment;
	TEBC_YIELD();

	TclPushTailcallPoint(interp);
	oPtr = contextPtr->oPtr;
	if (oPtr->flags & FILTER_HANDLING) {
	    TclNRAddCallback(interp, FinalizeOONextFilter,
		    framePtr, contextPtr, INT2PTR(contextPtr->index),
		    INT2PTR(contextPtr->skip));
	} else {
	    TclNRAddCallback(interp, FinalizeOONext,
		    framePtr, contextPtr, INT2PTR(contextPtr->index),
		    INT2PTR(contextPtr->skip));
	}
	contextPtr->skip = skip;
	contextPtr->index = newDepth;
	if (contextPtr->callPtr->chain[newDepth].isFilter
		|| contextPtr->callPtr->flags & FILTER_HANDLING) {
	    oPtr->flags |= FILTER_HANDLING;
	} else {
	    oPtr->flags &= ~FILTER_HANDLING;
	}

	{
	    register Method *const mPtr =
		    contextPtr->callPtr->chain[newDepth].mPtr;

	    return mPtr->typePtr->callProc(mPtr->clientData, interp,
		    (Tcl_ObjectContext) contextPtr, opnd, objv);
	}

    case INST_TCLOO_IS_OBJECT:
	oPtr = (Object *) Tcl_GetObjectFromObj(interp, OBJ_AT_TOS);
	objResultPtr = TCONST(oPtr != NULL ? 1 : 0);
	TRACE_WITH_OBJ(("%.30s => ", O2S(OBJ_AT_TOS)), objResultPtr);
	NEXT_INST_F(1, 1, 1);
    case INST_TCLOO_CLASS:
	oPtr = (Object *) Tcl_GetObjectFromObj(interp, OBJ_AT_TOS);
	if (oPtr == NULL) {
	    TRACE(("%.30s => ERROR: not object\n", O2S(OBJ_AT_TOS)));
	    goto gotError;
	}
	objResultPtr = TclOOObjectName(interp, oPtr->selfCls->thisPtr);
	TRACE_WITH_OBJ(("%.30s => ", O2S(OBJ_AT_TOS)), objResultPtr);
	NEXT_INST_F(1, 1, 1);
    case INST_TCLOO_NS:
	oPtr = (Object *) Tcl_GetObjectFromObj(interp, OBJ_AT_TOS);
	if (oPtr == NULL) {
	    TRACE(("%.30s => ERROR: not object\n", O2S(OBJ_AT_TOS)));
	    goto gotError;
	}

	/*
	 * TclOO objects *never* have the global namespace as their NS.
	 */

	TclNewStringObj(objResultPtr, oPtr->namespacePtr->fullName,
		strlen(oPtr->namespacePtr->fullName));
	TRACE_WITH_OBJ(("%.30s => ", O2S(OBJ_AT_TOS)), objResultPtr);
	NEXT_INST_F(1, 1, 1);
    }

    /*
     *     End of TclOO support instructions.
     * -----------------------------------------------------------------
     *	   Start of INST_LIST and related instructions.
     */

    {
	int index, numIndices, fromIdx, toIdx;
	int nocase, match, length2, cflags, s1len, s2len;
	const char *s1, *s2;

    case INST_LIST:
	/*
	 * Pop the opnd (objc) top stack elements into a new list obj and then
	 * decrement their ref counts.
	 */

	opnd = TclGetUInt4AtPtr(pc+1);
	objResultPtr = Tcl_NewListObj(opnd, &OBJ_AT_DEPTH(opnd-1));
	TRACE_WITH_OBJ(("%u => ", opnd), objResultPtr);
	NEXT_INST_V(5, opnd, 1);

    case INST_LIST_LENGTH:
	TRACE(("\"%.30s\" => ", O2S(OBJ_AT_TOS)));
	if (TclListObjLength(interp, OBJ_AT_TOS, &length) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	TclNewLongObj(objResultPtr, length);
	TRACE_APPEND(("%d\n", length));
	NEXT_INST_F(1, 1, 1);

    case INST_LIST_INDEX:	/* lindex with objc == 3 */
	value2Ptr = OBJ_AT_TOS;
	valuePtr = OBJ_UNDER_TOS;
	TRACE(("\"%.30s\" \"%.30s\" => ", O2S(valuePtr), O2S(value2Ptr)));

	/*
	 * Extract the desired list element.
	 */

	if ((TclListObjGetElements(interp, valuePtr, &objc, &objv) == TCL_OK)
		&& (value2Ptr->typePtr != &tclListType)
		&& (TclGetIntForIndexM(NULL , value2Ptr, objc-1,
			&index) == TCL_OK)) {
	    TclDecrRefCount(value2Ptr);
	    tosPtr--;
	    pcAdjustment = 1;
	    goto lindexFastPath;
	}

	objResultPtr = TclLindexList(interp, valuePtr, value2Ptr);
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Stash the list element on the stack.
	 */

	TRACE_APPEND(("\"%.30s\"\n", O2S(objResultPtr)));
	NEXT_INST_F(1, 2, -1);	/* Already has the correct refCount */

    case INST_LIST_INDEX_IMM:	/* lindex with objc==3 and index in bytecode
				 * stream */

	/*
	 * Pop the list and get the index.
	 */

	valuePtr = OBJ_AT_TOS;
	opnd = TclGetInt4AtPtr(pc+1);
	TRACE(("\"%.30s\" %d => ", O2S(valuePtr), opnd));

	/*
	 * Get the contents of the list, making sure that it really is a list
	 * in the process.
	 */

	if (TclListObjGetElements(interp, valuePtr, &objc, &objv) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Select the list item based on the index. Negative operand means
	 * end-based indexing.
	 */

	if (opnd < -1) {
	    index = opnd+1 + objc;
	} else {
	    index = opnd;
	}
	pcAdjustment = 5;

    lindexFastPath:
	if (index >= 0 && index < objc) {
	    objResultPtr = objv[index];
	} else {
	    TclNewObj(objResultPtr);
	}

	TRACE_APPEND(("\"%.30s\"\n", O2S(objResultPtr)));
	NEXT_INST_F(pcAdjustment, 1, 1);

    case INST_LIST_INDEX_MULTI:	/* 'lindex' with multiple index args */
	/*
	 * Determine the count of index args.
	 */

	opnd = TclGetUInt4AtPtr(pc+1);
	numIndices = opnd-1;

	/*
	 * Do the 'lindex' operation.
	 */

	TRACE(("%d => ", opnd));
	objResultPtr = TclLindexFlat(interp, OBJ_AT_DEPTH(numIndices),
		numIndices, &OBJ_AT_DEPTH(numIndices - 1));
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Set result.
	 */

	TRACE_APPEND(("\"%.30s\"\n", O2S(objResultPtr)));
	NEXT_INST_V(5, opnd, -1);

    case INST_LSET_FLAT:
	/*
	 * Lset with 3, 5, or more args. Get the number of index args.
	 */

	opnd = TclGetUInt4AtPtr(pc + 1);
	numIndices = opnd - 2;
	TRACE(("%d => ", opnd));

	/*
	 * Get the old value of variable, and remove the stack ref. This is
	 * safe because the variable still references the object; the ref
	 * count will never go zero here - we can use the smaller macro
	 * Tcl_DecrRefCount.
	 */

	valuePtr = POP_OBJECT();
	Tcl_DecrRefCount(valuePtr); /* This one should be done here */

	/*
	 * Compute the new variable value.
	 */

	objResultPtr = TclLsetFlat(interp, valuePtr, numIndices,
		&OBJ_AT_DEPTH(numIndices), OBJ_AT_TOS);
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Set result.
	 */

	TRACE_APPEND(("\"%.30s\"\n", O2S(objResultPtr)));
	NEXT_INST_V(5, numIndices+1, -1);

    case INST_LSET_LIST:	/* 'lset' with 4 args */
	/*
	 * Get the old value of variable, and remove the stack ref. This is
	 * safe because the variable still references the object; the ref
	 * count will never go zero here - we can use the smaller macro
	 * Tcl_DecrRefCount.
	 */

	objPtr = POP_OBJECT();
	Tcl_DecrRefCount(objPtr);	/* This one should be done here. */

	/*
	 * Get the new element value, and the index list.
	 */

	valuePtr = OBJ_AT_TOS;
	value2Ptr = OBJ_UNDER_TOS;
	TRACE(("\"%.30s\" \"%.30s\" \"%.30s\" => ",
		O2S(value2Ptr), O2S(valuePtr), O2S(objPtr)));

	/*
	 * Compute the new variable value.
	 */

	objResultPtr = TclLsetList(interp, objPtr, value2Ptr, valuePtr);
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Set result.
	 */

	TRACE_APPEND(("\"%.30s\"\n", O2S(objResultPtr)));
	NEXT_INST_F(1, 2, -1);

    case INST_LIST_RANGE_IMM:	/* lrange with objc==4 and both indices in
				 * bytecode stream */

	/*
	 * Pop the list and get the indices.
	 */

	valuePtr = OBJ_AT_TOS;
	fromIdx = TclGetInt4AtPtr(pc+1);
	toIdx = TclGetInt4AtPtr(pc+5);
	TRACE(("\"%.30s\" %d %d => ", O2S(valuePtr), TclGetInt4AtPtr(pc+1),
		TclGetInt4AtPtr(pc+5)));

	/*
	 * Get the contents of the list, making sure that it really is a list
	 * in the process.
	 */

	if (TclListObjGetElements(interp, valuePtr, &objc, &objv) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Skip a lot of work if we're about to throw the result away (common
	 * with uses of [lassign]).
	 */

#ifndef TCL_COMPILE_DEBUG
	if (*(pc+9) == INST_POP) {
	    NEXT_INST_F(10, 1, 0);
	}
#endif

	/*
	 * Adjust the indices for end-based handling.
	 */

	if (fromIdx < -1) {
	    fromIdx += 1+objc;
	    if (fromIdx < -1) {
		fromIdx = -1;
	    }
	} else if (fromIdx > objc) {
	    fromIdx = objc;
	}
	if (toIdx < -1) {
	    toIdx += 1 + objc;
	    if (toIdx < -1) {
		toIdx = -1;
	    }
	} else if (toIdx > objc) {
	    toIdx = objc;
	}

	/*
	 * Check if we are referring to a valid, non-empty list range, and if
	 * so, build the list of elements in that range.
	 */

	if (fromIdx<=toIdx && fromIdx<objc && toIdx>=0) {
	    if (fromIdx < 0) {
		fromIdx = 0;
	    }
	    if (toIdx >= objc) {
		toIdx = objc-1;
	    }
	    if (fromIdx == 0 && toIdx != objc-1 && !Tcl_IsShared(valuePtr)) {
		Tcl_ListObjReplace(interp, valuePtr,
			toIdx + 1, LIST_MAX, 0, NULL);
		TRACE_APPEND(("%.30s\n", O2S(valuePtr)));
		NEXT_INST_F(9, 0, 0);
	    }
	    objResultPtr = Tcl_NewListObj(toIdx-fromIdx+1, objv+fromIdx);
	} else {
	    TclNewObj(objResultPtr);
	}

	TRACE_APPEND(("\"%.30s\"", O2S(objResultPtr)));
	NEXT_INST_F(9, 1, 1);

    case INST_LIST_IN:
    case INST_LIST_NOT_IN:	/* Basic list containment operators. */
	value2Ptr = OBJ_AT_TOS;
	valuePtr = OBJ_UNDER_TOS;

	s1 = TclGetStringFromObj(valuePtr, &s1len);
	TRACE(("\"%.30s\" \"%.30s\" => ", O2S(valuePtr), O2S(value2Ptr)));
	if (TclListObjLength(interp, value2Ptr, &length) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	match = 0;
	if (length > 0) {
	    int i = 0;