/*
 * Static functions defined in this file.
 */

static void		AddBasicBlockRangeToErrorInfo(AssemblyEnv*,
			    BasicBlock*);


static BasicBlock *	AllocBB(AssemblyEnv*);
static int		AssembleOneLine(AssemblyEnv* envPtr);
static void		BBAdjustStackDepth(BasicBlock* bbPtr, int consumed,
			    int produced);
static void		BBUpdateStackReqs(BasicBlock* bbPtr, int tblIdx,
			    int count);
static void		BBEmitInstInt1(AssemblyEnv* assemEnvPtr, int tblIdx,

    "assemblecode",
    FreeAssembleCodeInternalRep, /* freeIntRepProc */
    DupAssembleCodeInternalRep,	 /* dupIntRepProc */
    NULL,			 /* updateStringProc */
    NULL			 /* setFromAnyProc */
};

/*
 * TIP #280: Remember the per-word line information of the current command. An
 * index is used instead of a pointer as recursive compilation may reallocate,
 * i.e. move, the array. This is also the reason to save the nuloc now, it may
 * change during the course of the function.
 *
 * Macro to encapsulate the variable definition and setup.
 */

#define DefineLineInformation \
    ExtCmdLoc *mapPtr = envPtr->extCmdMapPtr;				\
    int eclIndex = mapPtr->nuloc - 1

#define SetLineInformation(word) \
    envPtr->line = mapPtr->loc[eclIndex].line[(word)];			\
    envPtr->clNext = mapPtr->loc[eclIndex].next[(word)]

/*
 * Flags bits used by PushVarName.
 */

#define TCL_NO_LARGE_INDEX 1	/* Do not return localIndex value > 255 */

    INST_STR_MAP,						/* 143 */
    INST_STR_FIND,						/* 144 */
    INST_COROUTINE_NAME,					/* 149 */
    INST_NS_CURRENT,						/* 151 */
    INST_INFO_LEVEL_NUM,					/* 152 */
    INST_RESOLVE_COMMAND					/* 154 */
};
















/*
 * Helper macros.
 */

#if defined(TCL_DEBUG_ASSEMBLY) && defined(__GNUC__) && __GNUC__ > 2
#define DEBUG_PRINT(...)	fprintf(stderr, ##__VA_ARGS__);fflush(stderr)

	/*
	 * Not valid, so free it and regenerate.
	 */

	FreeAssembleCodeInternalRep(objPtr);
    }

    /*
     * Set up the compilation environment, and assemble the code.
     */

    source = TclGetStringFromObj(objPtr, &sourceLen);
    TclInitCompileEnv(interp, &compEnv, source, sourceLen, NULL, 0);
    status = TclAssembleCode(&compEnv, source, sourceLen, TCL_EVAL_DIRECT);
    if (status != TCL_OK) {
	/*
	 * Assembly failed. Clean up and report the error.
	 */
	TclFreeCompileEnv(&compEnv);
	return NULL;
    }

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

	    return TCL_ERROR;
	}

	/*
	 * Advance the pointers around any leading commentary.
	 */

	TclAdvanceLines(&assemEnvPtr->cmdLine, instPtr,
		parsePtr->commandStart);
	TclAdvanceContinuations(&assemEnvPtr->cmdLine, &assemEnvPtr->clNext,
		parsePtr->commandStart - envPtr->source);

	/*
	 * Process the line of code.
	 */

	if (parsePtr->numWords > 0) {
	    /*

	/*
	 * Advance to the next line of code.
	 */

	nextPtr = parsePtr->commandStart + parsePtr->commandSize;
	bytesLeft -= (nextPtr - instPtr);
	instPtr = nextPtr;
	TclAdvanceLines(&assemEnvPtr->cmdLine, parsePtr->commandStart,
		instPtr);
	TclAdvanceContinuations(&assemEnvPtr->cmdLine, &assemEnvPtr->clNext,
		instPtr - envPtr->source);
	Tcl_FreeParse(parsePtr);
    } while (bytesLeft > 0);

    /*
     * Done with parsing the code.
     */

    AssemblyEnv* assemEnvPtr = TclStackAlloc(interp, sizeof(AssemblyEnv));
				/* Assembler environment under construction */
    Tcl_Parse* parsePtr = TclStackAlloc(interp, sizeof(Tcl_Parse));
				/* Parse of one line of assembly code */

    assemEnvPtr->envPtr = envPtr;
    assemEnvPtr->parsePtr = parsePtr;
    assemEnvPtr->cmdLine = envPtr->line;
    assemEnvPtr->clNext = envPtr->clNext;

    /*
     * Make the hashtables that store symbol resolution.
     */

    Tcl_InitHashTable(&assemEnvPtr->labelHash, TCL_STRING_KEYS);

/*
 * Declarations for managing contexts for non-recursive coroutines. Contexts
 * are used to save the evaluation state between NR calls to each coro.
 */

#define SAVE_CONTEXT(context)				\
    (context).framePtr = iPtr->framePtr;		\
    (context).varFramePtr = iPtr->varFramePtr;		\
    (context).cmdFramePtr = iPtr->cmdFramePtr;		\
    (context).lineLABCPtr = iPtr->lineLABCPtr

#define RESTORE_CONTEXT(context)			\
    iPtr->framePtr = (context).framePtr;		\
    iPtr->varFramePtr = (context).varFramePtr;		\
    iPtr->cmdFramePtr = (context).cmdFramePtr;		\
    iPtr->lineLABCPtr = (context).lineLABCPtr

/*
 * Static functions in this file:
 */

static char *		CallCommandTraces(Interp *iPtr, Command *cmdPtr,
			    const char *oldName, const char *newName,

static Tcl_NRPostProc	TEOV_NotFoundCallback;
static Tcl_NRPostProc	TEOV_RestoreVarFrame;
static Tcl_NRPostProc	TEOV_RunLeaveTraces;

static Tcl_ObjCmdProc NRCoroInjectObjCmd;

MODULE_SCOPE const TclStubs tclStubs;


























/*
 * Magical counts for the number of arguments accepted by a coroutine command
 * after particular kinds of [yield].
 */

#define CORO_ACTIVATE_YIELD    PTR2INT(NULL)

    iPtr->interpInfo = NULL;

    iPtr->numLevels = 0;
    iPtr->maxNestingDepth = MAX_NESTING_DEPTH;
    iPtr->framePtr = NULL;	/* Initialise as soon as :: is available */
    iPtr->varFramePtr = NULL;	/* Initialise as soon as :: is available */

    /*
     * TIP #280 - Initialize the arrays used to extend the ByteCode and Proc
     * structures.
     */

    iPtr->cmdFramePtr = NULL;
    iPtr->linePBodyPtr = ckalloc(sizeof(Tcl_HashTable));
    iPtr->lineBCPtr = ckalloc(sizeof(Tcl_HashTable));
    iPtr->lineLAPtr = ckalloc(sizeof(Tcl_HashTable));
    iPtr->lineLABCPtr = ckalloc(sizeof(Tcl_HashTable));
    Tcl_InitHashTable(iPtr->linePBodyPtr, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(iPtr->lineBCPtr, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(iPtr->lineLAPtr, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(iPtr->lineLABCPtr, TCL_ONE_WORD_KEYS);
    iPtr->scriptCLLocPtr = NULL;

    iPtr->activeVarTracePtr = NULL;

    iPtr->returnOpts = NULL;
    iPtr->errorInfo = NULL;
    TclNewLiteralStringObj(iPtr->eiVar, "::errorInfo");
    Tcl_IncrRefCount(iPtr->eiVar);
    iPtr->errorStack = Tcl_NewListObj(0, NULL);
    Tcl_IncrRefCount(iPtr->errorStack);
    iPtr->resetErrorStack = 1;
    TclNewLiteralStringObj(iPtr->upLiteral,"UP");
    Tcl_IncrRefCount(iPtr->upLiteral);
    TclNewLiteralStringObj(iPtr->callLiteral,"CALL");
    Tcl_IncrRefCount(iPtr->callLiteral);
    TclNewLiteralStringObj(iPtr->innerLiteral,"INNER");
    Tcl_IncrRefCount(iPtr->innerLiteral);
    iPtr->innerContext = Tcl_NewListObj(0, NULL);
    Tcl_IncrRefCount(iPtr->innerContext);
    iPtr->errorCode = NULL;
    TclNewLiteralStringObj(iPtr->ecVar, "::errorCode");
    Tcl_IncrRefCount(iPtr->ecVar);
    iPtr->returnLevel = 1;
    iPtr->returnCode = TCL_OK;

    iPtr->rootFramePtr = NULL;	/* Initialise as soon as :: is available */

    iPtr->allocCache = TclpGetAllocCache();
#else
    iPtr->allocCache = NULL;
#endif
    iPtr->pendingObjDataPtr = NULL;
    iPtr->asyncReadyPtr = TclGetAsyncReadyPtr();
    iPtr->deferredCallbacks = NULL;



    /*
     * Create the core commands. Do it here, rather than calling
     * Tcl_CreateCommand, because it's faster (there's no need to check for a
     * pre-existing command by the same name). If a command has a Tcl_CmdProc
     * but no Tcl_ObjCmdProc, set the Tcl_ObjCmdProc to
     * TclInvokeStringCommand. This is an object-based wrapper function that

    Tcl_Interp *interp)		/* Interpreter to delete. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    Tcl_HashTable *hTablePtr;
    ResolverScheme *resPtr, *nextResPtr;
    int i;

    /*
     * Punt if there is an error in the Tcl_Release/Tcl_Preserve matchup,
	 * unless we are exiting.
     */

    if ((iPtr->numLevels > 0) && !TclInExit()) {

	iPtr->errorCode = NULL;
    }
    Tcl_DecrRefCount(iPtr->eiVar);
    if (iPtr->errorInfo) {
	Tcl_DecrRefCount(iPtr->errorInfo);
	iPtr->errorInfo = NULL;
    }
    Tcl_DecrRefCount(iPtr->errorStack);
    iPtr->errorStack = NULL;
    Tcl_DecrRefCount(iPtr->upLiteral);
    Tcl_DecrRefCount(iPtr->callLiteral);
    Tcl_DecrRefCount(iPtr->innerLiteral);
    Tcl_DecrRefCount(iPtr->innerContext);
    if (iPtr->returnOpts) {
	Tcl_DecrRefCount(iPtr->returnOpts);
    }
    if (iPtr->appendResult != NULL) {
	ckfree(iPtr->appendResult);
	iPtr->appendResult = NULL;
    }

    /*
     * Free up literal objects created for scripts compiled by the
     * interpreter.
     */

    TclDeleteLiteralTable(interp, &iPtr->literalTable);

    /*
     * TIP #280 - Release the arrays for ByteCode/Proc extension, and
     * contents.
     */

    for (hPtr = Tcl_FirstHashEntry(iPtr->linePBodyPtr, &search);
	    hPtr != NULL;
	    hPtr = Tcl_NextHashEntry(&search)) {
	CmdFrame *cfPtr = Tcl_GetHashValue(hPtr);
	Proc *procPtr = (Proc *) Tcl_GetHashKey(iPtr->linePBodyPtr, hPtr);

	procPtr->iPtr = NULL;
	if (cfPtr) {
	    if (cfPtr->type == TCL_LOCATION_SOURCE) {
		Tcl_DecrRefCount(cfPtr->data.eval.path);
	    }
	    ckfree(cfPtr->line);
	    ckfree(cfPtr);
	}
	Tcl_DeleteHashEntry(hPtr);
    }
    Tcl_DeleteHashTable(iPtr->linePBodyPtr);
    ckfree(iPtr->linePBodyPtr);
    iPtr->linePBodyPtr = NULL;

    /*
     * See also tclCompile.c, TclCleanupByteCode
     */

    for (hPtr = Tcl_FirstHashEntry(iPtr->lineBCPtr, &search);
	    hPtr != NULL;
	    hPtr = Tcl_NextHashEntry(&search)) {
	ExtCmdLoc *eclPtr = Tcl_GetHashValue(hPtr);

	if (eclPtr->type == TCL_LOCATION_SOURCE) {
	    Tcl_DecrRefCount(eclPtr->path);
	}
	for (i=0; i< eclPtr->nuloc; i++) {
	    ckfree(eclPtr->loc[i].line);
	}

	if (eclPtr->loc != NULL) {
	    ckfree(eclPtr->loc);
	}

	Tcl_DeleteHashTable(&eclPtr->litInfo);

	ckfree(eclPtr);
	Tcl_DeleteHashEntry(hPtr);
    }
    Tcl_DeleteHashTable(iPtr->lineBCPtr);
    ckfree(iPtr->lineBCPtr);
    iPtr->lineBCPtr = NULL;

    /*
     * Location stack for uplevel/eval/... scripts which were passed through
     * proc arguments. Actually we track all arguments as we do not and cannot
     * know which arguments will be used as scripts and which will not.
     */

    if (iPtr->lineLAPtr->numEntries && !TclInExit()) {
	/*
	 * When the interp goes away we have nothing on the stack, so there
	 * are no arguments, so this table has to be empty.
	 */

	Tcl_Panic("Argument location tracking table not empty");
    }

    Tcl_DeleteHashTable(iPtr->lineLAPtr);
    ckfree((char *) iPtr->lineLAPtr);
    iPtr->lineLAPtr = NULL;

    if (iPtr->lineLABCPtr->numEntries && !TclInExit()) {
	/*
	 * When the interp goes away we have nothing on the stack, so there
	 * are no arguments, so this table has to be empty.
	 */

	Tcl_Panic("Argument location tracking table not empty");
    }

    Tcl_DeleteHashTable(iPtr->lineLABCPtr);
    ckfree(iPtr->lineLABCPtr);
    iPtr->lineLABCPtr = NULL;

    /*
     * Squelch the tables of traces on variables and searches over arrays in
     * the in the interpreter.
     */

    Tcl_DeleteHashTable(&iPtr->varTraces);
    Tcl_DeleteHashTable(&iPtr->varSearches);

static Tcl_Obj *
GetCommandSource(
    Interp *iPtr,
    int objc,
    Tcl_Obj *const objv[],
    int lookup)
{
    Tcl_Obj *objPtr, *obj2Ptr;
    CmdFrame *cfPtr = iPtr->cmdFramePtr;
    const char *command = NULL;
    int numChars;

    objPtr = Tcl_NewListObj(objc, objv);
    if (lookup && cfPtr && (cfPtr->numLevels == iPtr->numLevels-1)) {
	switch (cfPtr->type) {
	case TCL_LOCATION_EVAL:
	case TCL_LOCATION_SOURCE:
	    command = cfPtr->cmd.str.cmd;

	    numChars = cfPtr->cmd.str.len;
	    break;
	case TCL_LOCATION_BC:
	case TCL_LOCATION_PREBC:
	    command = TclGetSrcInfoForCmd(iPtr, &numChars);
	    break;
	case TCL_LOCATION_EVAL_LIST:
	    /* Got it already */
	    break;
	}
	if (command) {
	    obj2Ptr = Tcl_NewStringObj(command, numChars);
	    objPtr->bytes = obj2Ptr->bytes;

	    objPtr->length = numChars;
	    obj2Ptr->bytes = NULL;



	    Tcl_DecrRefCount(obj2Ptr);


	}

    }
    Tcl_IncrRefCount(objPtr);
    return objPtr;
}

/*
 *----------------------------------------------------------------------

	if (!cmdPtr) {
	    return TEOV_NotFound(interp, objc, objv, lookupNsPtr);
	}
	if (result != TCL_OK) {
	    return result;
	}
    }



#ifdef USE_DTRACE
    if (TCL_DTRACE_CMD_ARGS_ENABLED()) {
	const char *a[10];
	int i = 0;

	while (i < 10) {
	    a[i] = i < objc ? TclGetString(objv[i]) : NULL; i++;
	}
	TCL_DTRACE_CMD_ARGS(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
		a[8], a[9]);
    }
    if (TCL_DTRACE_CMD_INFO_ENABLED() && iPtr->cmdFramePtr) {
	Tcl_Obj *info = TclInfoFrame(interp, iPtr->cmdFramePtr);
	const char *a[6]; int i[2];

	TclDTraceInfo(info, a, i);
	TCL_DTRACE_CMD_INFO(a[0], a[1], a[2], a[3], i[0], i[1], a[4], a[5]);
	TclDecrRefCount(info);
    }
    if (TCL_DTRACE_CMD_RETURN_ENABLED() || TCL_DTRACE_CMD_RESULT_ENABLED()) {
	TclNRAddCallback(interp, DTraceCmdReturn, objv[0], NULL, NULL, NULL);
    }
    if (TCL_DTRACE_CMD_ENTRY_ENABLED()) {
	TCL_DTRACE_CMD_ENTRY(TclGetString(objv[0]), objc - 1,
		(Tcl_Obj **)(objv + 1));
    }

				 * execute nested commands, and report
				 * errors. */
    Tcl_Token *tokenPtr,	/* Pointer to first in an array of tokens to
				 * evaluate and concatenate. */
    int count)			/* Number of tokens to consider at tokenPtr.
				 * Must be at least 1. */
{
    return TclSubstTokens(interp, tokenPtr, count, /* numLeftPtr */ NULL, 1,
	    NULL, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalTokens --
 *

 * Results:
 *	The return value is a standard Tcl completion code such as TCL_OK or
 *	TCL_ERROR. A result or error message is left in interp's result.
 *
 * Side effects:
 *	Depends on the script.
 *
 * TIP #280 : Keep public API, internally extended API.
 *----------------------------------------------------------------------
 */

int
Tcl_EvalEx(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * script. Also used for error reporting. */
    const char *script,		/* First character of script to evaluate. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first null character. */
    int flags)			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL is currently supported. */
{
    return TclEvalEx(interp, script, numBytes, flags, 1, NULL, script);
}

int
TclEvalEx(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * script. Also used for error reporting. */
    const char *script,		/* First character of script to evaluate. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first NUL character. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL is currently supported. */
    int line,			/* The line the script starts on. */
    int *clNextOuter,		/* Information about an outer context for */
    const char *outerScript)	/* continuation line data. This is set only in
				 * TclSubstTokens(), to properly handle
				 * [...]-nested commands. The 'outerScript'
				 * refers to the most-outer script containing
				 * the embedded command, which is refered to
				 * by 'script'. The 'clNextOuter' refers to
				 * the current entry in the table of
				 * continuation lines in this "master script",
				 * and the character offsets are relative to
				 * the 'outerScript' as well.
				 *
				 * If outerScript == script, then this call is
				 * for the outer-most script/command. See
				 * Tcl_EvalEx() and TclEvalObjEx() for places
				 * generating arguments for which this is
				 * true. */
{
    Interp *iPtr = (Interp *) interp;
    const char *p, *next;
    const unsigned int minObjs = 20;
    Tcl_Obj **objv, **objvSpace;
    int *expand, *lines, *lineSpace;
    Tcl_Token *tokenPtr;
    int commandLength, bytesLeft, expandRequested, code = TCL_OK;
    CallFrame *savedVarFramePtr;/* Saves old copy of iPtr->varFramePtr in case
				 * TCL_EVAL_GLOBAL was set. */
    int allowExceptions = (iPtr->evalFlags & TCL_ALLOW_EXCEPTIONS);
    int gotParse = 0;
    unsigned int i, objectsUsed = 0;
				/* These variables keep track of how much
				 * state has been allocated while evaluating
				 * the script, so that it can be freed
				 * properly if an error occurs. */
    Tcl_Parse *parsePtr = TclStackAlloc(interp, sizeof(Tcl_Parse));
    CmdFrame *eeFramePtr = TclStackAlloc(interp, sizeof(CmdFrame));
    Tcl_Obj **stackObjArray =
	    TclStackAlloc(interp, minObjs * sizeof(Tcl_Obj *));
    int *expandStack = TclStackAlloc(interp, minObjs * sizeof(int));
    int *linesStack = TclStackAlloc(interp, minObjs * sizeof(int));
				/* TIP #280 Structures for tracking of command
				 * locations. */
    int *clNext = NULL;		/* Pointer for the tracking of invisible
				 * continuation lines. Initialized only if the
				 * caller gave us a table of locations to
				 * track, via scriptCLLocPtr. It always refers
				 * to the table entry holding the location of
				 * the next invisible continuation line to
				 * look for, while parsing the script. */

    if (iPtr->scriptCLLocPtr) {
	if (clNextOuter) {
	    clNext = clNextOuter;
	} else {
	    clNext = &iPtr->scriptCLLocPtr->loc[0];
	}
    }

    if (numBytes < 0) {
	numBytes = strlen(script);
    }
    Tcl_ResetResult(interp);

    savedVarFramePtr = iPtr->varFramePtr;
    if (flags & TCL_EVAL_GLOBAL) {
	iPtr->varFramePtr = iPtr->rootFramePtr;
    }

    /*
     * Each iteration through the following loop parses the next command from
     * the script and then executes it.
     */

    objv = objvSpace = stackObjArray;
    lines = lineSpace = linesStack;
    expand = expandStack;
    p = script;
    bytesLeft = numBytes;

    /*
     * TIP #280 Initialize tracking. Do not push on the frame stack yet.
     *
     * We may continue counting based on a specific context (CTX), or open a
     * new context, either for a sourced script, or 'eval'. For sourced files
     * we always have a path object, even if nothing was specified in the
     * interp itself. That makes code using it simpler as NULL checks can be
     * left out. Sourced file without path in the 'scriptFile' is possible
     * during Tcl initialization.
     */

    eeFramePtr->level = iPtr->cmdFramePtr ? iPtr->cmdFramePtr->level + 1 : 1;
    eeFramePtr->numLevels = iPtr->numLevels;
    eeFramePtr->framePtr = iPtr->framePtr;
    eeFramePtr->nextPtr = iPtr->cmdFramePtr;
    eeFramePtr->nline = 0;
    eeFramePtr->line = NULL;

    iPtr->cmdFramePtr = eeFramePtr;
    if (iPtr->evalFlags & TCL_EVAL_CTX) {
	/*
	 * Path information comes out of the context.
	 */

	eeFramePtr->type = TCL_LOCATION_SOURCE;
	eeFramePtr->data.eval.path = iPtr->invokeCmdFramePtr->data.eval.path;
	Tcl_IncrRefCount(eeFramePtr->data.eval.path);
    } else if (iPtr->evalFlags & TCL_EVAL_FILE) {
	/*
	 * Set up for a sourced file.
	 */

	eeFramePtr->type = TCL_LOCATION_SOURCE;

	if (iPtr->scriptFile) {
	    /*
	     * Normalization here, to have the correct pwd. Should have
	     * negligible impact on performance, as the norm should have been
	     * done already by the 'source' invoking us, and it caches the
	     * result.
	     */

	    Tcl_Obj *norm = Tcl_FSGetNormalizedPath(interp, iPtr->scriptFile);

	    if (norm == NULL) {
		/*
		 * Error message in the interp result.
		 */

		code = TCL_ERROR;
		goto error;
	    }
	    eeFramePtr->data.eval.path = norm;
	} else {
	    TclNewLiteralStringObj(eeFramePtr->data.eval.path, "");
	}
	Tcl_IncrRefCount(eeFramePtr->data.eval.path);
    } else {
	/*
	 * Set up for plain eval.
	 */

	eeFramePtr->type = TCL_LOCATION_EVAL;
	eeFramePtr->data.eval.path = NULL;
    }

    iPtr->evalFlags = 0;
    do {
	if (Tcl_ParseCommand(interp, p, bytesLeft, 0, parsePtr) != TCL_OK) {
	    code = TCL_ERROR;
	    goto error;
	}

	/*
	 * TIP #280 Track lines. The parser may have skipped text till it
	 * found the command we are now at. We have to count the lines in this
	 * block, and do not forget invisible continuation lines.
	 */

	TclAdvanceLines(&line, p, parsePtr->commandStart);
	TclAdvanceContinuations(&line, &clNext,
		parsePtr->commandStart - outerScript);

	gotParse = 1;
	if (parsePtr->numWords > 0) {
	    /*
	     * TIP #280. Track lines within the words of the current
	     * command. We use a separate pointer into the table of
	     * continuation line locations to not lose our position for the
	     * per-command parsing.
	     */

	    int wordLine = line;
	    const char *wordStart = parsePtr->commandStart;
	    int *wordCLNext = clNext;
	    unsigned int objectsNeeded = 0;
	    unsigned int numWords = parsePtr->numWords;

	    /*
	     * Generate an array of objects for the words of the command.
	     */

	    if (numWords > minObjs) {
		expand =    ckalloc(numWords * sizeof(int));
		objvSpace = ckalloc(numWords * sizeof(Tcl_Obj *));
		lineSpace = ckalloc(numWords * sizeof(int));
	    }
	    expandRequested = 0;
	    objv = objvSpace;
	    lines = lineSpace;

	    iPtr->cmdFramePtr = eeFramePtr->nextPtr;
	    for (objectsUsed = 0, tokenPtr = parsePtr->tokenPtr;
		    objectsUsed < numWords;
		    objectsUsed++, tokenPtr += tokenPtr->numComponents+1) {
		/*
		 * TIP #280. Track lines to current word. Save the information
		 * on a per-word basis, signaling dynamic words as needed.
		 * Make the information available to the recursively called
		 * evaluator as well, including the type of context (source
		 * vs. eval).
		 */

		TclAdvanceLines(&wordLine, wordStart, tokenPtr->start);
		TclAdvanceContinuations(&wordLine, &wordCLNext,
			tokenPtr->start - outerScript);
		wordStart = tokenPtr->start;

		lines[objectsUsed] = TclWordKnownAtCompileTime(tokenPtr, NULL)
			? wordLine : -1;

		if (eeFramePtr->type == TCL_LOCATION_SOURCE) {
		    iPtr->evalFlags |= TCL_EVAL_FILE;
		}

		code = TclSubstTokens(interp, tokenPtr+1,
			tokenPtr->numComponents, NULL, wordLine,
			wordCLNext, outerScript);

		iPtr->evalFlags = 0;

		if (code != TCL_OK) {
		    break;
		}
		objv[objectsUsed] = Tcl_GetObjResult(interp);

		    objectsNeeded += (numElements ? numElements : 1);
		} else {
		    expand[objectsUsed] = 0;
		    objectsNeeded++;
		}

		if (wordCLNext) {
		    TclContinuationsEnterDerived(objv[objectsUsed],
			    wordStart - outerScript, wordCLNext);
		}
	    } /* for loop */
	    iPtr->cmdFramePtr = eeFramePtr;
	    if (code != TCL_OK) {
		goto error;
	    }
	    if (expandRequested) {
		/*
		 * Some word expansion was requested. Check for objv resize.
		 */

		Tcl_Obj **copy = objvSpace;
		int *lcopy = lineSpace;
		int wordIdx = numWords;
		int objIdx = objectsNeeded - 1;

		if ((numWords > minObjs) || (objectsNeeded > minObjs)) {
		    objv = objvSpace =
			    ckalloc(objectsNeeded * sizeof(Tcl_Obj *));
		    lines = lineSpace = ckalloc(objectsNeeded * sizeof(int));
		}

		objectsUsed = 0;
		while (wordIdx--) {
		    if (expand[wordIdx]) {
			int numElements;
			Tcl_Obj **elements, *temp = copy[wordIdx];

			Tcl_ListObjGetElements(NULL, temp, &numElements,
				&elements);
			objectsUsed += numElements;
			while (numElements--) {
			    lines[objIdx] = -1;
			    objv[objIdx--] = elements[numElements];
			    Tcl_IncrRefCount(elements[numElements]);
			}
			Tcl_DecrRefCount(temp);
		    } else {
			lines[objIdx] = lcopy[wordIdx];
			objv[objIdx--] = copy[wordIdx];
			objectsUsed++;
		    }
		}
		objv += objIdx+1;

		if (copy != stackObjArray) {
		    ckfree(copy);
		}
		if (lcopy != linesStack) {
		    ckfree(lcopy);
		}
	    }

	    /*
	     * Execute the command and free the objects for its words.
	     *
	     * TIP #280: Remember the command itself for 'info frame'. We
	     * shorten the visible command by one char to exclude the
	     * termination character, if necessary. Here is where we put our
	     * frame on the stack of frames too. _After_ the nested commands
	     * have been executed.
	     */

	    eeFramePtr->cmd.str.cmd = parsePtr->commandStart;
	    eeFramePtr->cmd.str.len = parsePtr->commandSize;

	    if (parsePtr->term ==
		    parsePtr->commandStart + parsePtr->commandSize - 1) {
		eeFramePtr->cmd.str.len--;
	    }

	    eeFramePtr->nline = objectsUsed;


	    eeFramePtr->line = lines;

	    TclArgumentEnter(interp, objv, objectsUsed, eeFramePtr);
	    code = Tcl_EvalObjv(interp, objectsUsed, objv, TCL_EVAL_NOERR);
	    TclArgumentRelease(interp, objv, objectsUsed);


	    eeFramePtr->line = NULL;
	    eeFramePtr->nline = 0;

	    if (code != TCL_OK) {
		goto error;
	    }
	    for (i = 0; i < objectsUsed; i++) {
		Tcl_DecrRefCount(objv[i]);
	    }
	    objectsUsed = 0;
	    if (objvSpace != stackObjArray) {
		ckfree(objvSpace);
		objvSpace = stackObjArray;
		ckfree(lineSpace);
		lineSpace = linesStack;
	    }

	    /*
	     * Free expand separately since objvSpace could have been
	     * reallocated above.
	     */

	    if (expand != expandStack) {
		ckfree(expand);
		expand = expandStack;
	    }
	}

	/*
	 * Advance to the next command in the script.
	 *
	 * TIP #280 Track Lines. Now we track how many lines were in the
	 * executed command.
	 */

	next = parsePtr->commandStart + parsePtr->commandSize;
	bytesLeft -= next - p;
	p = next;
	TclAdvanceLines(&line, parsePtr->commandStart, p);
	Tcl_FreeParse(parsePtr);
	gotParse = 0;
    } while (bytesLeft > 0);
    iPtr->varFramePtr = savedVarFramePtr;
    code = TCL_OK;
    goto cleanup_return;

	Tcl_DecrRefCount(objv[i]);
    }
    if (gotParse) {
	Tcl_FreeParse(parsePtr);
    }
    if (objvSpace != stackObjArray) {
	ckfree(objvSpace);
	ckfree(lineSpace);
    }
    if (expand != expandStack) {
	ckfree(expand);
    }
    iPtr->varFramePtr = savedVarFramePtr;

 cleanup_return:
    /*
     * TIP #280. Release the local CmdFrame, and its contents.
     */

    iPtr->cmdFramePtr = iPtr->cmdFramePtr->nextPtr;
    if (eeFramePtr->type == TCL_LOCATION_SOURCE) {
	Tcl_DecrRefCount(eeFramePtr->data.eval.path);
    }
    TclStackFree(interp, linesStack);
    TclStackFree(interp, expandStack);
    TclStackFree(interp, stackObjArray);
    TclStackFree(interp, eeFramePtr);
    TclStackFree(interp, parsePtr);

    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * TclAdvanceLines --
 *
 *	This function is a helper which counts the number of lines in a block
 *	of text and advances an external counter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The specified counter is advanced per the number of lines found.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclAdvanceLines(
    int *line,
    const char *start,
    const char *end)
{
    register const char *p;

    for (p = start; p < end; p++) {
	if (*p == '\n') {
	    (*line)++;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclAdvanceContinuations --
 *
 *	This procedure is a helper which counts the number of continuation
 *	lines (CL) in a block of text using a table of CL locations and
 *	advances an external counter, and the pointer into the table.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The specified counter is advanced per the number of continuation lines
 *	found.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclAdvanceContinuations(
    int *line,
    int **clNextPtrPtr,
    int loc)
{
    /*
     * Track the invisible continuation lines embedded in a script, if any.
     * Here they are just spaces (already). They were removed by
     * TclSubstTokens via TclParseBackslash.
     *
     * *clNextPtrPtr         <=> We have continuation lines to track.
     * **clNextPtrPtr >= 0   <=> We are not beyond the last possible location.
     * loc >= **clNextPtrPtr <=> We stepped beyond the current cont. line.
     */

    while (*clNextPtrPtr && (**clNextPtrPtr >= 0)
	    && (loc >= **clNextPtrPtr)) {
	/*
	 * We just stepped over an invisible continuation line. Adjust the
	 * line counter and step to the table entry holding the location of
	 * the next continuation line to track.
	 */

	(*line)++;
	(*clNextPtrPtr)++;
    }
}

/*
 *----------------------------------------------------------------------
 * Note: The whole data structure access for argument location tracking is
 * hidden behind these three functions. The only parts open are the lineLAPtr
 * field in the Interp structure. The CFWord definition is internal to here.
 * Should make it easier to redo the data structures if we find something more
 * space/time efficient.
 */

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentEnter --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	enters location references for the arguments of a command to be
 *	invoked. Only the first entry has the actual data, further entries
 *	simply count the usage up.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May allocate memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentEnter(
    Tcl_Interp *interp,
    Tcl_Obj **objv,
    int objc,
    CmdFrame *cfPtr)
{
    Interp *iPtr = (Interp *) interp;
    int new, i;
    Tcl_HashEntry *hPtr;
    CFWord *cfwPtr;

    for (i = 1; i < objc; i++) {
	/*
	 * Ignore argument words without line information (= dynamic). If they
	 * are variables they may have location information associated with
	 * that, either through globally recorded 'set' invokations, or
	 * literals in bytecode. Eitehr way there is no need to record
	 * something here.
	 */

	if (cfPtr->line[i] < 0) {
	    continue;
	}
	hPtr = Tcl_CreateHashEntry(iPtr->lineLAPtr, objv[i], &new);
	if (new) {
	    /*
	     * The word is not on the stack yet, remember the current location
	     * and initialize references.
	     */

	    cfwPtr = ckalloc(sizeof(CFWord));
	    cfwPtr->framePtr = cfPtr;
	    cfwPtr->word = i;
	    cfwPtr->refCount = 1;
	    Tcl_SetHashValue(hPtr, cfwPtr);
	} else {
	    /*
	     * The word is already on the stack, its current location is not
	     * relevant. Just remember the reference to prevent early removal.
	     */

	    cfwPtr = Tcl_GetHashValue(hPtr);
	    cfwPtr->refCount++;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentRelease --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	removes the location references for the arguments of a command just
 *	done. Usage is counted down, the data is removed only when no user is
 *	left over.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May release memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentRelease(
    Tcl_Interp *interp,
    Tcl_Obj **objv,
    int objc)
{
    Interp *iPtr = (Interp *) interp;
    int i;

    for (i = 1; i < objc; i++) {
	CFWord *cfwPtr;
	Tcl_HashEntry *hPtr =
		Tcl_FindHashEntry(iPtr->lineLAPtr, (char *) objv[i]);

	if (!hPtr) {
	    continue;
	}
	cfwPtr = Tcl_GetHashValue(hPtr);

	cfwPtr->refCount--;
	if (cfwPtr->refCount > 0) {
	    continue;
	}

	ckfree(cfwPtr);
	Tcl_DeleteHashEntry(hPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentBCEnter --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	enters location references for the literal arguments of commands in
 *	bytecode about to be invoked. Only the first entry has the actual
 *	data, further entries simply count the usage up.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May allocate memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentBCEnter(
    Tcl_Interp *interp,
    Tcl_Obj *objv[],
    int objc,
    void *codePtr,
    CmdFrame *cfPtr,
    int pc)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hePtr =
	    Tcl_FindHashEntry(iPtr->lineBCPtr, (char *) codePtr);
    ExtCmdLoc *eclPtr;

    if (!hePtr) {
	return;
    }
    eclPtr = Tcl_GetHashValue(hePtr);
    hePtr = Tcl_FindHashEntry(&eclPtr->litInfo, INT2PTR(pc));
    if (hePtr) {
	int word;
	int cmd = PTR2INT(Tcl_GetHashValue(hePtr));
	ECL *ePtr = &eclPtr->loc[cmd];
	CFWordBC *lastPtr = NULL;

	/*
	 * A few truths ...
	 * (1) ePtr->nline == objc
	 * (2) (ePtr->line[word] < 0) => !literal, for all words
	 * (3) (word == 0) => !literal
	 *
	 * Item (2) is why we can use objv to get the literals, and do not
	 * have to save them at compile time.
	 */

        if (ePtr->nline != objc) {
            Tcl_Panic ("TIP 280 data structure inconsistency");
        }

	for (word = 1; word < objc; word++) {
	    if (ePtr->line[word] >= 0) {
		int isnew;
		Tcl_HashEntry *hPtr = Tcl_CreateHashEntry(iPtr->lineLABCPtr,
			objv[word], &isnew);
		CFWordBC *cfwPtr = ckalloc(sizeof(CFWordBC));

		cfwPtr->framePtr = cfPtr;
		cfwPtr->obj = objv[word];
		cfwPtr->pc = pc;
		cfwPtr->word = word;
		cfwPtr->nextPtr = lastPtr;
		lastPtr = cfwPtr;

		if (isnew) {
		    /*
		     * The word is not on the stack yet, remember the current
		     * location and initialize references.
		     */

		    cfwPtr->prevPtr = NULL;
		} else {
		    /*
		     * The object is already on the stack, however it may have
		     * a different location now (literal sharing may map
		     * multiple location to a single Tcl_Obj*. Save the old
		     * information in the new structure.
		     */

		    cfwPtr->prevPtr = Tcl_GetHashValue(hPtr);
		}

		Tcl_SetHashValue(hPtr, cfwPtr);
	    }
	} /* for */

	cfPtr->litarg = lastPtr;
    } /* if */
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentBCRelease --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	removes the location references for the literal arguments of commands
 *	in bytecode just done. Usage is counted down, the data is removed only
 *	when no user is left over.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May release memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentBCRelease(
    Tcl_Interp *interp,
    CmdFrame *cfPtr)
{
    Interp *iPtr = (Interp *) interp;
    CFWordBC *cfwPtr = (CFWordBC *) cfPtr->litarg;

    while (cfwPtr) {
	CFWordBC *nextPtr = cfwPtr->nextPtr;
	Tcl_HashEntry *hPtr =
		Tcl_FindHashEntry(iPtr->lineLABCPtr, (char *) cfwPtr->obj);
	CFWordBC *xPtr = Tcl_GetHashValue(hPtr);

	if (xPtr != cfwPtr) {
	    Tcl_Panic("TclArgumentBC Enter/Release Mismatch");
	}

	if (cfwPtr->prevPtr) {
	    Tcl_SetHashValue(hPtr, cfwPtr->prevPtr);
	} else {
	    Tcl_DeleteHashEntry(hPtr);
	}

	ckfree(cfwPtr);
	cfwPtr = nextPtr;
    }

    cfPtr->litarg = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentGet --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	finds the location references for a Tcl_Obj, if any.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Writes found location information into the result arguments.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentGet(
    Tcl_Interp *interp,
    Tcl_Obj *obj,
    CmdFrame **cfPtrPtr,
    int *wordPtr)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hPtr;
    CmdFrame *framePtr;

    /*
     * An object which either has no string rep or else is a canonical list is
     * guaranteed to have been generated dynamically: bail out, this cannot
     * have a usable absolute location. _Do not touch_ the information the set
     * up by the caller. It knows better than us.
     */

    if ((obj->bytes == NULL) || TclListObjIsCanonical(obj)) {
	return;
    }

    /*
     * First look for location information recorded in the argument
     * stack. That is nearest.
     */

    hPtr = Tcl_FindHashEntry(iPtr->lineLAPtr, (char *) obj);
    if (hPtr) {
	CFWord *cfwPtr = Tcl_GetHashValue(hPtr);

	*wordPtr = cfwPtr->word;
	*cfPtrPtr = cfwPtr->framePtr;
	return;
    }

    /*
     * Check if the Tcl_Obj has location information as a bytecode literal, in
     * that stack.
     */

    hPtr = Tcl_FindHashEntry(iPtr->lineLABCPtr, (char *) obj);
    if (hPtr) {
	CFWordBC *cfwPtr = Tcl_GetHashValue(hPtr);

	framePtr = cfwPtr->framePtr;
	framePtr->data.tebc.pc = (char *) (((ByteCode *)
		framePtr->data.tebc.codePtr)->codeStart + cfwPtr->pc);
	*cfPtrPtr = cfwPtr->framePtr;
	*wordPtr = cfwPtr->word;
	return;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Eval --
 *
 *	Execute a Tcl command in a string. This function executes the script

 *	the return code.
 *
 * Side effects:
 *	The object is converted, if necessary, to a ByteCode object that holds
 *	the bytecode instructions for the commands. Executing the commands
 *	will almost certainly have side effects that depend on those commands.
 *
 * TIP #280 : Keep public API, internally extended API.
 *----------------------------------------------------------------------
 */

int
Tcl_EvalObjEx(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
    register Tcl_Obj *objPtr,	/* Pointer to object containing commands to
				 * execute. */
    int flags)			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Supported values
				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
{
    return TclEvalObjEx(interp, objPtr, flags, NULL, 0);
}

int
TclEvalObjEx(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
    register Tcl_Obj *objPtr,	/* Pointer to object containing commands to
				 * execute. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Supported values
				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
    const CmdFrame *invoker,	/* Frame of the command doing the eval. */
    int word)			/* Index of the word which is in objPtr. */
{
    int result = TCL_OK;
    NRE_callback *rootPtr = TOP_CB(interp);

    result = TclNREvalObjEx(interp, objPtr, flags, invoker, word);
    return TclNRRunCallbacks(interp, result, rootPtr);
}

int
TclNREvalObjEx(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
    register Tcl_Obj *objPtr,	/* Pointer to object containing commands to
				 * execute. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Supported values
				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
    const CmdFrame *invoker,	/* Frame of the command doing the eval. */
    int word)			/* Index of the word which is in objPtr. */
{
    Interp *iPtr = (Interp *) interp;
    int result;

    /*
     * This function consists of three independent blocks for: direct
     * evaluation of canonical lists, compilation and bytecode execution and
     * finally direct evaluation. Precisely one of these blocks will be run.
     */

    if (TclListObjIsCanonical(objPtr)) {
	Tcl_Obj *listPtr = objPtr;
	CmdFrame *eoFramePtr = NULL;
	int objc;
	Tcl_Obj **objv;

	/*
	 * Pure List Optimization (no string representation). In this case, we
	 * can safely use Tcl_EvalObjv instead and get an appreciable
	 * improvement in execution speed. This is because it allows us to

	 */

	Tcl_IncrRefCount(objPtr);
	listPtr = TclListObjCopy(interp, objPtr);
	Tcl_IncrRefCount(listPtr);
	TclDecrRefCount(objPtr);

	if (word != INT_MIN) {
	    /*
	     * TIP #280 Structures for tracking lines. As we know that this is
	     * dynamic execution we ignore the invoker, even if known.
	     *
	     * TIP #280. We do _not_ compute all the line numbers for the
	     * words in the command. For the eval of a pure list the most
	     * sensible choice is to put all words on line 1. Given that we
	     * neither need memory for them nor compute anything. 'line' is
	     * left NULL. The two places using this information (TclInfoFrame,
	     * and TclInitCompileEnv), are special-cased to use the proper
	     * line number directly instead of accessing the 'line' array.
	     *
	     * Note that we use (word==INTMIN) to signal that no command frame
	     * should be pushed, as needed by alias and ensemble redirections.
	     */

	    eoFramePtr = TclStackAlloc(interp, sizeof(CmdFrame));
	    eoFramePtr->nline = 0;
	    eoFramePtr->line = NULL;

	    eoFramePtr->type = TCL_LOCATION_EVAL_LIST;
	    eoFramePtr->level = (iPtr->cmdFramePtr == NULL?
		    1 : iPtr->cmdFramePtr->level + 1);
	    eoFramePtr->numLevels = iPtr->numLevels;
	    eoFramePtr->framePtr = iPtr->framePtr;
	    eoFramePtr->nextPtr = iPtr->cmdFramePtr;

	    eoFramePtr->cmd.listPtr = listPtr;
	    eoFramePtr->data.eval.path = NULL;

	    iPtr->cmdFramePtr = eoFramePtr;
	}

	TclMarkTailcall(interp);
        TclNRAddCallback(interp, TEOEx_ListCallback, listPtr, eoFramePtr,
		NULL, NULL);

	ListObjGetElements(listPtr, objc, objv);
	return TclNREvalObjv(interp, objc, objv, flags, NULL);
    }

    if (!(flags & TCL_EVAL_DIRECT)) {
	/*
	 * Let the compiler/engine subsystem do the evaluation.
	 *
	 * TIP #280 The invoker provides us with the context for the script.
	 * We transfer this to the byte code compiler.
	 */

	int allowExceptions = (iPtr->evalFlags & TCL_ALLOW_EXCEPTIONS);
	ByteCode *codePtr;
	CallFrame *savedVarFramePtr = NULL;	/* Saves old copy of
						 * iPtr->varFramePtr in case
						 * TCL_EVAL_GLOBAL was set. */

        if (TclInterpReady(interp) != TCL_OK) {
            return TCL_ERROR;
        }
	if (flags & TCL_EVAL_GLOBAL) {
	    savedVarFramePtr = iPtr->varFramePtr;
	    iPtr->varFramePtr = iPtr->rootFramePtr;
	}
	Tcl_IncrRefCount(objPtr);
	codePtr = TclCompileObj(interp, objPtr, invoker, word);

	TclNRAddCallback(interp, TEOEx_ByteCodeCallback, savedVarFramePtr,
		objPtr, INT2PTR(allowExceptions), NULL);
        return TclNRExecuteByteCode(interp, codePtr);
    }

    {
	/*
	 * We're not supposed to use the compiler or byte-code
	 * interpreter. Let Tcl_EvalEx evaluate the command directly (and
	 * probably more slowly).
	 *
	 * TIP #280. Propagate context as much as we can. Especially if the
	 * script to evaluate is a single literal it makes sense to look if
	 * our context is one with absolute line numbers we can then track
	 * into the literal itself too.
	 *
	 * See also tclCompile.c, TclInitCompileEnv, for the equivalent code
	 * in the bytecode compiler.
	 */

	const char *script;
	int numSrcBytes;

	/*
	 * Now we check if we have data about invisible continuation lines for
	 * the script, and make it available to the direct script parser and
	 * evaluator we are about to call, if so.
	 *
	 * It may be possible that the script Tcl_Obj* can be free'd while the
	 * evaluator is using it, leading to the release of the associated
	 * ContLineLoc structure as well. To ensure that the latter doesn't
	 * happen we set a lock on it. We release this lock later in this
	 * function, after the evaluator is done. The relevant "lineCLPtr"
	 * hashtable is managed in the file "tclObj.c".
	 *
	 * Another important action is to save (and later restore) the
	 * continuation line information of the caller, in case we are
	 * executing nested commands in the eval/direct path.
	 */

	ContLineLoc *saveCLLocPtr = iPtr->scriptCLLocPtr;
	ContLineLoc *clLocPtr = TclContinuationsGet(objPtr);

	if (clLocPtr) {
	    iPtr->scriptCLLocPtr = clLocPtr;
	    Tcl_Preserve(iPtr->scriptCLLocPtr);
	} else {
	    iPtr->scriptCLLocPtr = NULL;
	}

	Tcl_IncrRefCount(objPtr);
	if (invoker == NULL) {
	    /*
	     * No context, force opening of our own.
	     */

	    script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);
	    result = Tcl_EvalEx(interp, script, numSrcBytes, flags);
	} else {
	    /*
	     * We have an invoker, describing the command asking for the
	     * evaluation of a subordinate script. This script may originate
	     * in a literal word, or from a variable, etc. Using the line
	     * array we now check if we have good line information for the
	     * relevant word. The type of context is relevant as well. In a
	     * non-'source' context we don't have to try tracking lines.
	     *
	     * First see if the word exists and is a literal. If not we go
	     * through the easy dynamic branch. No need to perform more
	     * complex invokations.
	     */

	    int pc = 0;
	    CmdFrame *ctxPtr = TclStackAlloc(interp, sizeof(CmdFrame));

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

		TclGetSrcInfoForPc(ctxPtr);
		pc = 1;
	    }

	    script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);

	    if ((invoker->nline <= word) ||
		    (invoker->line[word] < 0) ||
		    (ctxPtr->type != TCL_LOCATION_SOURCE)) {
		/*
		 * Dynamic script, or dynamic context, force our own context.
		 */

		result = Tcl_EvalEx(interp, script, numSrcBytes, flags);
	    } else {
		/*
		 * Absolute context to reuse.
		 */

		iPtr->invokeCmdFramePtr = ctxPtr;
		iPtr->evalFlags |= TCL_EVAL_CTX;

		result = TclEvalEx(interp, script, numSrcBytes, flags,
			ctxPtr->line[word], NULL, script);
	    }
	    if (pc && (ctxPtr->type == TCL_LOCATION_SOURCE)) {
		/*
		 * Death of SrcInfo reference.
		 */

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

	/*
	 * Now release the lock on the continuation line information, if any,
	 * and restore the caller's settings.
	 */

	if (iPtr->scriptCLLocPtr) {
	    Tcl_Release(iPtr->scriptCLLocPtr);
	}
	iPtr->scriptCLLocPtr = saveCLLocPtr;
	TclDecrRefCount(objPtr);
	return result;
    }
}

static int
TEOEx_ByteCodeCallback(

static int
TEOEx_ListCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *listPtr = data[0];
    CmdFrame *eoFramePtr = data[1];

    /*
     * Remove the cmdFrame
     */

    if (eoFramePtr) {
	iPtr->cmdFramePtr = eoFramePtr->nextPtr;
	TclStackFree(interp, eoFramePtr);
    }
    TclDecrRefCount(listPtr);

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * ProcessUnexpectedResult --

    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclDTraceInfo --
 *
 *	Extract information from a TIP280 dict for use by DTrace probes.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclDTraceInfo(
    Tcl_Obj *info,
    const char **args,
    int *argsi)
{
    static Tcl_Obj *keys[10] = { NULL };
    Tcl_Obj **k = keys, *val;
    int i = 0;

    if (!*k) {
#define kini(s) TclNewLiteralStringObj(keys[i], s); i++
	kini("cmd");	kini("type");	kini("proc");	kini("file");
	kini("method");	kini("class");	kini("lambda");	kini("object");
	kini("line");	kini("level");
#undef kini
    }
    for (i = 0; i < 6; i++) {
	Tcl_DictObjGet(NULL, info, *k++, &val);
	args[i] = val ? TclGetString(val) : NULL;
    }
    /* no "proc" -> use "lambda" */
    if (!args[2]) {
	Tcl_DictObjGet(NULL, info, *k, &val);
	args[2] = val ? TclGetString(val) : NULL;
    }
    k++;
    /* no "class" -> use "object" */
    if (!args[5]) {
	Tcl_DictObjGet(NULL, info, *k, &val);
	args[5] = val ? TclGetString(val) : NULL;
    }
    k++;
    for (i = 0; i < 2; i++) {
	Tcl_DictObjGet(NULL, info, *k++, &val);
	if (val) {
	    TclGetIntFromObj(NULL, val, &argsi[i]);
	} else {
	    argsi[i] = 0;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DTraceCmdReturn --
 *
 *	NR callback for DTrace command return probes.
 *
 * Results:
 *	None.
 *

	while (i < 10) {
	    a[i] = i < objc ? TclGetString(objv[i]) : NULL; i++;
	}
	TCL_DTRACE_CMD_ARGS(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
		a[8], a[9]);
    }
    if (TCL_DTRACE_CMD_INFO_ENABLED() && ((Interp *) interp)->cmdFramePtr) {
	Tcl_Obj *info = TclInfoFrame(interp, ((Interp *) interp)->cmdFramePtr);
	const char *a[6]; int i[2];

	TclDTraceInfo(info, a, i);
	TCL_DTRACE_CMD_INFO(a[0], a[1], a[2], a[3], i[0], i[1], a[4], a[5]);
	TclDecrRefCount(info);
    }
    if ((TCL_DTRACE_CMD_RETURN_ENABLED() || TCL_DTRACE_CMD_RESULT_ENABLED())
	    && objc) {
	TclNRAddCallback(interp, DTraceCmdReturn, objv[0], NULL, NULL, NULL);
    }
    if (TCL_DTRACE_CMD_ENTRY_ENABLED() && objc) {
	TCL_DTRACE_CMD_ENTRY(TclGetString(objv[0]), objc - 1,
		(Tcl_Obj **)(objv + 1));

int
Tcl_NREvalObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr,
    int flags)
{
    return TclNREvalObjEx(interp, objPtr, flags, NULL, INT_MIN);
}

int
Tcl_NREvalObjv(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * command. Also used for error reporting. */
    int objc,			/* Number of words in command. */

	/*
	 * The execEnv was wound down but not deleted for our sake. We finish
	 * the job here. The caller context has already been restored.
	 */

	NRE_ASSERT(iPtr->varFramePtr == corPtr->caller.varFramePtr);
	NRE_ASSERT(iPtr->framePtr == corPtr->caller.framePtr);
	NRE_ASSERT(iPtr->cmdFramePtr == corPtr->caller.cmdFramePtr);
	ckfree(corPtr);
	return result;
    }

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

    corPtr->eePtr->corPtr = NULL;
    TclDeleteExecEnv(corPtr->eePtr);
    corPtr->eePtr = NULL;

    corPtr->stackLevel = NULL;

    /*
     * #280.
     * Drop the coroutine-owned copy of the lineLABCPtr hashtable for literal
     * command arguments in bytecode.
     */

    Tcl_DeleteHashTable(corPtr->lineLABCPtr);
    ckfree(corPtr->lineLABCPtr);
    corPtr->lineLABCPtr = NULL;

    RESTORE_CONTEXT(corPtr->caller);
    iPtr->execEnvPtr = corPtr->callerEEPtr;
    iPtr->numLevels++;

    return result;
}


    /*
     * Add the callback to the coro's execEnv, so that it is the first thing
     * to happen when the coro is resumed.
     */

    iPtr->execEnvPtr = corPtr->eePtr;
    TclNREvalObjEx(interp, Tcl_NewListObj(objc-2, objv+2), 0, NULL, INT_MIN);
    iPtr->execEnvPtr = savedEEPtr;

    return TCL_OK;
}

int
TclNRInterpCoroutine(

    cmdPtr = (Command *) Tcl_NRCreateCommand(interp, Tcl_DStringValue(&ds),
	    /*objProc*/ NULL, TclNRInterpCoroutine, corPtr, DeleteCoroutine);
    Tcl_DStringFree(&ds);

    corPtr->cmdPtr = cmdPtr;
    cmdPtr->refCount++;

    /*
     * #280.
     * Provide the new coroutine with its own copy of the lineLABCPtr
     * hashtable for literal command arguments in bytecode. Note that that
     * CFWordBC chains are not duplicated, only the entrypoints to them. This
     * means that in the presence of coroutines each chain is potentially a
     * tree. Like the chain -> tree conversion of the CmdFrame stack.
     */

    {
	Tcl_HashSearch hSearch;
	Tcl_HashEntry *hePtr;

	corPtr->lineLABCPtr = ckalloc(sizeof(Tcl_HashTable));
	Tcl_InitHashTable(corPtr->lineLABCPtr, TCL_ONE_WORD_KEYS);

	for (hePtr = Tcl_FirstHashEntry(iPtr->lineLABCPtr,&hSearch);
		hePtr; hePtr = Tcl_NextHashEntry(&hSearch)) {
	    int isNew;
	    Tcl_HashEntry *newPtr =
		    Tcl_CreateHashEntry(corPtr->lineLABCPtr,
		    Tcl_GetHashKey(iPtr->lineLABCPtr, hePtr),
		    &isNew);

	    Tcl_SetHashValue(newPtr, Tcl_GetHashValue(hePtr));
	}
    }

    /*
     * Create the base context.
     */

    corPtr->running.framePtr = iPtr->rootFramePtr;
    corPtr->running.varFramePtr = iPtr->rootFramePtr;
    corPtr->running.cmdFramePtr = NULL;
    corPtr->running.lineLABCPtr = corPtr->lineLABCPtr;
    corPtr->stackLevel = NULL;
    corPtr->auxNumLevels = 0;

    /*
     * Create the coro's execEnv, switch to it to push the exit and coro
     * command callbacks, then switch back.
     */

    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *varNamePtr = NULL;
    Tcl_Obj *optionVarNamePtr = NULL;
    Interp *iPtr = (Interp *) interp;

    if ((objc < 2) || (objc > 4)) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"script ?resultVarName? ?optionVarName?");
	return TCL_ERROR;
    }

    if (objc >= 3) {
	varNamePtr = objv[2];
    }
    if (objc == 4) {
	optionVarNamePtr = objv[3];
    }

    TclNRAddCallback(interp, CatchObjCmdCallback, INT2PTR(objc),
	    varNamePtr, optionVarNamePtr, NULL);

    /*
     * TIP #280. Make invoking context available to caught script.
     */

    return TclNREvalObjEx(interp, objv[1], 0, iPtr->cmdFramePtr, 1);
}

static int
CatchObjCmdCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)

TclNREvalObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    register Tcl_Obj *objPtr;
    Interp *iPtr = (Interp *) interp;
    CmdFrame *invoker = NULL;
    int word = 0;

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "arg ?arg ...?");
	return TCL_ERROR;
    }

    if (objc == 2) {
	/*
	 * TIP #280. Make argument location available to eval'd script.
	 */

	invoker = iPtr->cmdFramePtr;
	word = 1;
	objPtr = objv[1];
	TclArgumentGet(interp, objPtr, &invoker, &word);
    } else {
	/*
	 * More than one argument: concatenate them together with spaces
	 * between, then evaluate the result. Tcl_EvalObjEx will delete the
	 * object when it decrements its refcount after eval'ing it.
	 *
	 * TIP #280. Make invoking context available to eval'd script, done
	 * with the default values.
	 */

	objPtr = Tcl_ConcatObj(objc-1, objv+1);
    }
    TclNRAddCallback(interp, EvalCmdErrMsg, NULL, NULL, NULL, NULL);
    return TclNREvalObjEx(interp, objPtr, 0, invoker, word);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ExitObjCmd --
 *

int
TclNRForObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;
    ForIterData *iterPtr;

    if (objc != 5) {
	Tcl_WrongNumArgs(interp, 1, objv, "start test next command");
	return TCL_ERROR;
    }

    TclSmallAllocEx(interp, sizeof(ForIterData), iterPtr);
    iterPtr->cond = objv[2];
    iterPtr->body = objv[4];
    iterPtr->next = objv[3];
    iterPtr->msg  = "\n    (\"for\" body line %d)";
    iterPtr->word = 4;

    TclNRAddCallback(interp, ForSetupCallback, iterPtr, NULL, NULL, NULL);

    /*
     * TIP #280. Make invoking context available to initial script.
     */

    return TclNREvalObjEx(interp, objv[1], 0, iPtr->cmdFramePtr, 1);
}

static int
ForSetupCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)

static int
ForCondCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    ForIterData *iterPtr = data[0];
    Tcl_Obj *boolObj = data[1];
    int value;

    if (result != TCL_OK) {
	Tcl_DecrRefCount(boolObj);
	TclSmallFreeEx(interp, iterPtr);
	return result;
    } else if (Tcl_GetBooleanFromObj(interp, boolObj, &value) != TCL_OK) {
	Tcl_DecrRefCount(boolObj);
	TclSmallFreeEx(interp, iterPtr);
	return TCL_ERROR;
    }
    Tcl_DecrRefCount(boolObj);

    if (value) {
	/* TIP #280. */
	if (iterPtr->next) {
	    TclNRAddCallback(interp, ForNextCallback, iterPtr, NULL, NULL,
		    NULL);
	} else {
	    TclNRAddCallback(interp, TclNRForIterCallback, iterPtr, NULL,
		    NULL, NULL);
	}
	return TclNREvalObjEx(interp, iterPtr->body, 0, iPtr->cmdFramePtr,
		iterPtr->word);
    }
    TclSmallFreeEx(interp, iterPtr);
    return result;
}

static int
ForNextCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    ForIterData *iterPtr = data[0];
    Tcl_Obj *next = iterPtr->next;

    if ((result == TCL_OK) || (result == TCL_CONTINUE)) {
	TclNRAddCallback(interp, ForPostNextCallback, iterPtr, NULL, NULL,
		NULL);

	/*
	 * TIP #280. Make invoking context available to next script.
	 */

	return TclNREvalObjEx(interp, next, 0, iPtr->cmdFramePtr, 3);
    }

    TclNRAddCallback(interp, TclNRForIterCallback, iterPtr, NULL, NULL, NULL);
    return result;
}

static int

    if (statePtr->maxj > 0) {
	result = ForeachAssignments(interp, statePtr);
	if (result == TCL_ERROR) {
	    goto done;
	}

	TclNRAddCallback(interp, ForeachLoopStep, statePtr, NULL, NULL, NULL);
	return TclNREvalObjEx(interp, objv[objc-1], 0,
		((Interp *) interp)->cmdFramePtr, objc-1);
    }

    /*
     * This cleanup stage is only used when an error occurs during setup or if
     * there is no work to do.
     */

    if (statePtr->maxj > ++statePtr->j) {
	result = ForeachAssignments(interp, statePtr);
	if (result == TCL_ERROR) {
	    goto done;
	}

	TclNRAddCallback(interp, ForeachLoopStep, statePtr, NULL, NULL, NULL);
	return TclNREvalObjEx(interp, statePtr->bodyPtr, 0,
		((Interp *) interp)->cmdFramePtr, statePtr->bodyIdx);
    }

    /*
     * We're done. Tidy up our work space and finish off.
     */

  finish:

			    int objc, Tcl_Obj *const objv[]);
static int		InfoCommandsCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoCompleteCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoDefaultCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
/* TIP #348 - New 'info' subcommand 'errorstack' */
static int		InfoErrorStackCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
/* TIP #280 - New 'info' subcommand 'frame' */
static int		InfoFrameCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoFunctionsCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoHostnameCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoLevelCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoLibraryCmd(ClientData dummy, Tcl_Interp *interp,

    {"args",		   InfoArgsCmd,		    TclCompileBasic1ArgCmd, NULL, NULL, 0},
    {"body",		   InfoBodyCmd,		    TclCompileBasic1ArgCmd, NULL, NULL, 0},
    {"cmdcount",	   InfoCmdCountCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"commands",	   InfoCommandsCmd,	    TclCompileInfoCommandsCmd, NULL, NULL, 0},
    {"complete",	   InfoCompleteCmd,	    TclCompileBasic1ArgCmd, NULL, NULL, 0},
    {"coroutine",	   TclInfoCoroutineCmd,     TclCompileInfoCoroutineCmd, NULL, NULL, 0},
    {"default",		   InfoDefaultCmd,	    TclCompileBasic3ArgCmd, NULL, NULL, 0},
    {"errorstack",	   InfoErrorStackCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"exists",		   TclInfoExistsCmd,	    TclCompileInfoExistsCmd, NULL, NULL, 0},
    {"frame",		   InfoFrameCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"functions",	   InfoFunctionsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"globals",		   TclInfoGlobalsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"hostname",	   InfoHostnameCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"level",		   InfoLevelCmd,	    TclCompileInfoLevelCmd, NULL, NULL, 0},
    {"library",		   InfoLibraryCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"loaded",		   InfoLoadedCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"locals",		   TclInfoLocalsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},

static int
IfConditionCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    int objc = PTR2INT(data[0]);
    Tcl_Obj *const *objv = data[1];
    int i = PTR2INT(data[2]);
    Tcl_Obj *boolObj = data[3];
    int value, thenScriptIndex = 0;
    const char *clause;

	 * The expression evaluated to false. Skip the command, then see if
	 * there is an "else" or "elseif" clause.
	 */

	i++;
	if (i >= objc) {
	    if (thenScriptIndex) {
		/*
		 * TIP #280. Make invoking context available to branch.
		 */

		return TclNREvalObjEx(interp, objv[thenScriptIndex], 0,
			iPtr->cmdFramePtr, thenScriptIndex);
	    }
	    return TCL_OK;
	}
	clause = TclGetString(objv[i]);
	if ((clause[0] != 'e') || (strcmp(clause, "elseif") != 0)) {
	    break;
	}

	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"wrong # args: extra words after \"else\" clause in \"if\" command",
		-1));
	Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
	return TCL_ERROR;
    }
    if (thenScriptIndex) {
	/*
	 * TIP #280. Make invoking context available to branch/else.
	 */

	return TclNREvalObjEx(interp, objv[thenScriptIndex], 0,
		iPtr->cmdFramePtr, thenScriptIndex);
    }
    return TclNREvalObjEx(interp, objv[i], 0, iPtr->cmdFramePtr, i);

  missingScript:
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "wrong # args: no script following \"%s\" argument",
	    TclGetString(objv[i-1])));
    Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
    return TCL_ERROR;

    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARGUMENT", argName, NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoErrorStackCmd --
 *
 *	Called to implement the "info errorstack" command that returns information
 *	about the last error's call stack. Handles the following syntax:
 *
 *	    info errorstack ?interp?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoErrorStackCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Interp *target;
    Interp *iPtr;

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

    target = interp;
    if (objc == 2) {
	target = Tcl_GetSlave(interp, Tcl_GetString(objv[1]));
	if (target == NULL) {
	    return TCL_ERROR;
	}
    }

    iPtr = (Interp *) target;
    Tcl_SetObjResult(interp, iPtr->errorStack);

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInfoExistsCmd --
 *
 *	Called to implement the "info exists" command that determines whether
 *	a variable exists. Handles the following syntax:
 *
 *	    info exists varName
 *

    varName = TclGetString(objv[1]);
    varPtr = TclVarTraceExists(interp, varName);

    Tcl_SetObjResult(interp,
	    Tcl_NewBooleanObj(varPtr && varPtr->value.objPtr));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoFrameCmd --
 *	TIP #280
 *
 *	Called to implement the "info frame" command that returns the location
 *	of either the currently executing command, or its caller. Handles the
 *	following syntax:
 *
 *		info frame ?number?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoFrameCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;
    int level, topLevel, code = TCL_OK;
    CmdFrame *runPtr, *framePtr;
    CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?number?");
	return TCL_ERROR;
    }

    topLevel = ((iPtr->cmdFramePtr == NULL)
	    ? 0
	    : iPtr->cmdFramePtr->level);

    if (corPtr) {
	/*
	 * A coroutine: must fix the level computations AND the cmdFrame chain,
	 * which is interrupted at the base.
	 */

	CmdFrame *lastPtr = NULL;

	runPtr = iPtr->cmdFramePtr;

	/* TODO - deal with overflow */
	topLevel += corPtr->caller.cmdFramePtr->level;
	while (runPtr) {
	    runPtr->level += corPtr->caller.cmdFramePtr->level;
	    lastPtr = runPtr;
	    runPtr = runPtr->nextPtr;
	}
	if (lastPtr) {
	    lastPtr->nextPtr = corPtr->caller.cmdFramePtr;
	} else {
	    iPtr->cmdFramePtr = corPtr->caller.cmdFramePtr;
	}
    }

    if (objc == 1) {
	/*
	 * Just "info frame".
	 */

	Tcl_SetObjResult(interp, Tcl_NewIntObj(topLevel));
	goto done;
    }

    /*
     * We've got "info frame level" and must parse the level first.
     */

    if (TclGetIntFromObj(interp, objv[1], &level) != TCL_OK) {
	code = TCL_ERROR;
	goto done;
    }

    if ((level > topLevel) || (level <= - topLevel)) {
    levelError:
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"bad level \"%s\"", TclGetString(objv[1])));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "STACK_FRAME",
		TclGetString(objv[1]), NULL);
	code = TCL_ERROR;
	goto done;
    }

    /*
     * Let us convert to relative so that we know how many levels to go back
     */

    if (level > 0) {
	level -= topLevel;
    }

    framePtr = iPtr->cmdFramePtr;
    while (++level <= 0) {
	framePtr = framePtr->nextPtr;
	if (!framePtr) {
	    goto levelError;
	}
    }

    Tcl_SetObjResult(interp, TclInfoFrame(interp, framePtr));

  done:
    if (corPtr) {

	if (iPtr->cmdFramePtr == corPtr->caller.cmdFramePtr) {
	    iPtr->cmdFramePtr = NULL;
	} else {
	    runPtr = iPtr->cmdFramePtr;
	    while (runPtr->nextPtr != corPtr->caller.cmdFramePtr) {
	    	runPtr->level -= corPtr->caller.cmdFramePtr->level;
		runPtr = runPtr->nextPtr;
	    }
	    runPtr->level = 1;
	    runPtr->nextPtr = NULL;
	}

    }
    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInfoFrame --
 *
 *	Core of InfoFrameCmd, returns TIP280 dict for a given frame.
 *
 * Results:
 *	Returns TIP280 dict.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclInfoFrame(
    Tcl_Interp *interp,		/* Current interpreter. */
    CmdFrame *framePtr)		/* Frame to get info for. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *tmpObj;
    Tcl_Obj *lv[20];		/* Keep uptodate when more keys are added to
				 * the dict. */
    int lc = 0;
    /*
     * This array is indexed by the TCL_LOCATION_... values, except
     * for _LAST.
     */
    static const char *const typeString[TCL_LOCATION_LAST] = {
	"eval", "eval", "eval", "precompiled", "source", "proc"
    };
    Proc *procPtr = framePtr->framePtr ? framePtr->framePtr->procPtr : NULL;

    /*
     * Pull the information and construct the dictionary to return, as list.
     * Regarding use of the CmdFrame fields see tclInt.h, and its definition.
     */

#define ADD_PAIR(name, value) \
	TclNewLiteralStringObj(tmpObj, name); \
	lv[lc++] = tmpObj; \
	lv[lc++] = (value)

    switch (framePtr->type) {
    case TCL_LOCATION_EVAL:
	/*
	 * Evaluation, dynamic script. Type, line, cmd, the latter through
	 * str.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	ADD_PAIR("line", Tcl_NewIntObj(framePtr->line[0]));
	ADD_PAIR("cmd", Tcl_NewStringObj(framePtr->cmd.str.cmd,
		framePtr->cmd.str.len));
	break;

    case TCL_LOCATION_EVAL_LIST:
	/*
	 * List optimized evaluation. Type, line, cmd, the latter through
	 * listPtr, possibly a frame.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	ADD_PAIR("line", Tcl_NewIntObj(1));

	/*
	 * We put a duplicate of the command list obj into the result to
	 * ensure that the 'pure List'-property of the command itself is not
	 * destroyed. Otherwise the query here would disable the list
	 * optimization path in Tcl_EvalObjEx.
	 */

	ADD_PAIR("cmd", Tcl_DuplicateObj(framePtr->cmd.listPtr));
	break;

    case TCL_LOCATION_PREBC:
	/*
	 * Precompiled. Result contains the type as signal, nothing else.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	break;

    case TCL_LOCATION_BC: {
	/*
	 * Execution of bytecode. Talk to the BC engine to fill out the frame.
	 */

	CmdFrame *fPtr = TclStackAlloc(interp, sizeof(CmdFrame));

	*fPtr = *framePtr;

	/*
	 * Note:
	 * Type BC => f.data.eval.path	  is not used.
	 *	      f.data.tebc.codePtr is used instead.
	 */

	TclGetSrcInfoForPc(fPtr);

	/*
	 * Now filled: cmd.str.(cmd,len), line
	 * Possibly modified: type, path!
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[fPtr->type], -1));
	if (fPtr->line) {
	    ADD_PAIR("line", Tcl_NewIntObj(fPtr->line[0]));
	}

	if (fPtr->type == TCL_LOCATION_SOURCE) {
	    ADD_PAIR("file", fPtr->data.eval.path);

	    /*
	     * Death of reference by TclGetSrcInfoForPc.
	     */

	    Tcl_DecrRefCount(fPtr->data.eval.path);
	}

	ADD_PAIR("cmd",
		Tcl_NewStringObj(fPtr->cmd.str.cmd, fPtr->cmd.str.len));
	TclStackFree(interp, fPtr);
	break;
    }

    case TCL_LOCATION_SOURCE:
	/*
	 * Evaluation of a script file.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	ADD_PAIR("line", Tcl_NewIntObj(framePtr->line[0]));
	ADD_PAIR("file", framePtr->data.eval.path);

	/*
	 * Refcount framePtr->data.eval.path goes up when lv is converted into
	 * the result list object.
	 */

	ADD_PAIR("cmd", Tcl_NewStringObj(framePtr->cmd.str.cmd,
		framePtr->cmd.str.len));
	break;

    case TCL_LOCATION_PROC:
	Tcl_Panic("TCL_LOCATION_PROC found in standard frame");
	break;
    }

    /*
     * 'proc'. Common to all frame types. Conditional on having an associated
     * Procedure CallFrame.
     */

    if (procPtr != NULL) {
	Tcl_HashEntry *namePtr = procPtr->cmdPtr->hPtr;

	if (namePtr) {
	    Tcl_Obj *procNameObj;

	    /*
	     * This is a regular command.
	     */

	    TclNewObj(procNameObj);
	    Tcl_GetCommandFullName(interp, (Tcl_Command) procPtr->cmdPtr,
		    procNameObj);
	    ADD_PAIR("proc", procNameObj);
	} else if (procPtr->cmdPtr->clientData) {
	    ExtraFrameInfo *efiPtr = procPtr->cmdPtr->clientData;
	    int i;

	    /*
	     * This is a non-standard command. Luckily, it's told us how to
	     * render extra information about its frame.
	     */

	    for (i=0 ; i<efiPtr->length ; i++) {
		lv[lc++] = Tcl_NewStringObj(efiPtr->fields[i].name, -1);
		if (efiPtr->fields[i].proc) {
		    lv[lc++] =
			efiPtr->fields[i].proc(efiPtr->fields[i].clientData);
		} else {
		    lv[lc++] = efiPtr->fields[i].clientData;
		}
	    }
	}
    }

    /*
     * 'level'. Common to all frame types. Conditional on having an associated
     * _visible_ CallFrame.
     */

    if ((framePtr->framePtr != NULL) && (iPtr->varFramePtr != NULL)) {
	CallFrame *current = framePtr->framePtr;
	CallFrame *top = iPtr->varFramePtr;
	CallFrame *idx;

	for (idx=top ; idx!=NULL ; idx=idx->callerVarPtr) {
	    if (idx == current) {
		int c = framePtr->framePtr->level;
		int t = iPtr->varFramePtr->level;

		ADD_PAIR("level", Tcl_NewIntObj(t - c));
		break;
	    }
	}
    }

    return Tcl_NewListObj(lc, lv);
}

/*
 *----------------------------------------------------------------------
 *
 * InfoFunctionsCmd --
 *
 *	Called to implement the "info functions" command that returns the list

{
    int i,j, index, mode, foundmode, splitObjs, numMatchesSaved;
    int noCase, patternLength;
    const char *pattern;
    Tcl_Obj *stringObj, *indexVarObj, *matchVarObj;
    Tcl_Obj *const *savedObjv = objv;
    Tcl_RegExp regExpr = NULL;
    Interp *iPtr = (Interp *) interp;
    int pc = 0;
    int bidx = 0;		/* Index of body argument. */
    Tcl_Obj *blist = NULL;	/* List obj which is the body */
    CmdFrame *ctxPtr;		/* Copy of the topmost cmdframe, to allow us
				 * to mess with the line information */

    /*
     * If you add options that make -e and -g not unique prefixes of -exact or
     * -glob, you *must* fix TclCompileSwitchCmd's option parser as well.
     */

    static const char *const options[] = {

		"MODERESTRICTION", NULL);
	return TCL_ERROR;
    }

    stringObj = objv[i];
    objc -= i + 1;
    objv += i + 1;
    bidx = i + 1;		/* First after the match string. */

    /*
     * If all of the pattern/command pairs are lumped into a single argument,
     * split them out again.
     *
     * TIP #280: Determine the lines the words in the list start at, based on
     * the same data for the list word itself. The cmdFramePtr line
     * information is manipulated directly.
     */

    splitObjs = 0;
    if (objc == 1) {
	Tcl_Obj **listv;

	blist = objv[0];
	if (TclListObjGetElements(interp, objv[0], &objc, &listv) != TCL_OK){
	    return TCL_ERROR;
	}

	/*
	 * Ensure that the list is non-empty.
	 */

    /*
     * We've got a match. Find a body to execute, skipping bodies that are
     * "-".
     */

  matchFound:
    ctxPtr = TclStackAlloc(interp, sizeof(CmdFrame));
    *ctxPtr = *iPtr->cmdFramePtr;

    if (splitObjs) {
	/*
	 * We have to perform the GetSrc and other type dependent handling of
	 * the frame here because we are munging with the line numbers,
	 * something the other commands like if, etc. are not doing. Them are
	 * fine with simply passing the CmdFrame through and having the
	 * special handling done in 'info frame', or the bc compiler
	 */

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

	    TclGetSrcInfoForPc(ctxPtr);
	    pc = 1;

	    /*
	     * The line information in the cmdFrame is now a copy we do not
	     * own.
	     */
	}

	if (ctxPtr->type == TCL_LOCATION_SOURCE && ctxPtr->line[bidx] >= 0) {
	    int bline = ctxPtr->line[bidx];

	    ctxPtr->line = ckalloc(objc * sizeof(int));
	    ctxPtr->nline = objc;
	    TclListLines(blist, bline, objc, ctxPtr->line, objv);
	} else {
	    /*
	     * This is either a dynamic code word, when all elements are
	     * relative to themselves, or something else less expected and
	     * where we have no information. The result is the same in both
	     * cases; tell the code to come that it doesn't know where it is,
	     * which triggers reversion to the old behavior.
	     */

	    int k;

	    ctxPtr->line = ckalloc(objc * sizeof(int));
	    ctxPtr->nline = objc;
	    for (k=0; k < objc; k++) {
		ctxPtr->line[k] = -1;
	    }
	}
    }

    for (j = i + 1; ; j += 2) {
	if (j >= objc) {
	    /*
	     * This shouldn't happen since we've checked that the last body is
	     * not a continuation...
	     */

	    Tcl_Panic("fall-out when searching for body to match pattern");
	}
	if (strcmp(TclGetString(objv[j]), "-") != 0) {
	    break;
	}
    }

    /*
     * TIP #280: Make invoking context available to switch branch.
     */

    Tcl_NRAddCallback(interp, SwitchPostProc, INT2PTR(splitObjs), ctxPtr,
	    INT2PTR(pc), (ClientData) pattern);
    return TclNREvalObjEx(interp, objv[j], 0, ctxPtr, splitObjs ? j : bidx+j);
}

static int
SwitchPostProc(
    ClientData data[],		/* Data passed from Tcl_NRAddCallback above */
    Tcl_Interp *interp,		/* Tcl interpreter */
    int result)			/* Result to return*/
{
    /* Unpack the preserved data */

    int splitObjs = PTR2INT(data[0]);
    CmdFrame *ctxPtr = data[1];
    int pc = PTR2INT(data[2]);
    const char *pattern = data[3];
    int patternLength = strlen(pattern);

    /*
     * Clean up TIP 280 context information
     */

    if (splitObjs) {
	ckfree(ctxPtr->line);
	if (pc && (ctxPtr->type == TCL_LOCATION_SOURCE)) {
	    /*
	     * Death of SrcInfo reference.
	     */

	    Tcl_DecrRefCount(ctxPtr->data.eval.path);
	}
    }

    /*
     * Generate an error message if necessary.
     */

    if (result == TCL_ERROR) {
	int limit = 50;
	int overflow = (patternLength > limit);

	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
		"\n    (\"%.*s%s\" arm line %d)",
		(overflow ? limit : patternLength), pattern,
		(overflow ? "..." : ""), Tcl_GetErrorLine(interp)));
    }
    TclStackFree(interp, ctxPtr);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ThrowObjCmd --

    /*
     * Execute the body.
     */

    Tcl_NRAddCallback(interp, TryPostBody, handlersObj, finallyObj,
	    (ClientData)objv, INT2PTR(objc));
    return TclNREvalObjEx(interp, bodyObj, 0,
	    ((Interp *) interp)->cmdFramePtr, 1);
}

/*
 *----------------------------------------------------------------------
 *
 * During --
 *

	     * arguments to [try] and so are still on the Tcl value stack.
	     */

	    handlerBodyObj = info[4];
	    Tcl_NRAddCallback(interp, TryPostHandler, objv, options, info[0],
		    INT2PTR((finallyObj == NULL) ? 0 : objc - 1));
	    Tcl_DecrRefCount(handlersObj);
	    return TclNREvalObjEx(interp, handlerBodyObj, 0,
		    ((Interp *) interp)->cmdFramePtr, 4*i + 5);

	handlerFailed:
	    resultObj = Tcl_GetObjResult(interp);
	    Tcl_IncrRefCount(resultObj);
	    options = During(interp, result, options, NULL);
	    break;

    /*
     * Process the finally clause.
     */

    if (finallyObj != NULL) {
	Tcl_NRAddCallback(interp, TryPostFinal, resultObj, options, cmdObj,
		NULL);
	return TclNREvalObjEx(interp, finallyObj, 0,
		((Interp *) interp)->cmdFramePtr, objc - 1);
    }

    /*
     * Install the correct result/options into the interpreter and clean up
     * any temporary storage.
     */

    }

    /*
     * Process the finally clause if it is present.
     */

    if (finallyObj != NULL) {
	Interp *iPtr = (Interp *) interp;

	Tcl_NRAddCallback(interp, TryPostFinal, resultObj, options, cmdObj,
		NULL);

	/* The 'finally' script is always the last argument word. */
	return TclNREvalObjEx(interp, finallyObj, 0, iPtr->cmdFramePtr,
		finally);
    }

    /*
     * Install the correct result/options into the interpreter and clean up
     * any temporary storage.
     */

     */

    TclSmallAllocEx(interp, sizeof(ForIterData), iterPtr);
    iterPtr->cond = objv[1];
    iterPtr->body = objv[2];
    iterPtr->next = NULL;
    iterPtr->msg  = "\n    (\"while\" body line %d)";
    iterPtr->word = 2;

    TclNRAddCallback(interp, TclNRForIterCallback, iterPtr, NULL,
	    NULL, NULL);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclListLines --
 *
 *	???
 *
 * Results:
 *	Filled in array of line numbers?
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclListLines(
    Tcl_Obj *listObj,		/* Pointer to obj holding a string with list
				 * structure. Assumed to be valid. Assumed to
				 * contain n elements. */
    int line,			/* Line the list as a whole starts on. */
    int n,			/* #elements in lines */
    int *lines,			/* Array of line numbers, to fill. */
    Tcl_Obj *const *elems)      /* The list elems as Tcl_Obj*, in need of
				 * derived continuation data */
{
    const char *listStr = Tcl_GetString(listObj);
    const char *listHead = listStr;
    int i, length = strlen(listStr);
    const char *element = NULL, *next = NULL;
    ContLineLoc *clLocPtr = TclContinuationsGet(listObj);
    int *clNext = (clLocPtr ? &clLocPtr->loc[0] : NULL);

    for (i = 0; i < n; i++) {
	TclFindElement(NULL, listStr, length, &element, &next, NULL, NULL);

	TclAdvanceLines(&line, listStr, element);
				/* Leading whitespace */
	TclAdvanceContinuations(&line, &clNext, element - listHead);
	if (elems && clNext) {
	    TclContinuationsEnterDerived(elems[i], element-listHead, clNext);
	}
	lines[i] = line;
	length -= (next - listStr);
	TclAdvanceLines(&line, element, next);
				/* Element */
	listStr = next;

	if (*element == 0) {
	    /* ASSERT i == n */
	    break;
	}
    }
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

			    unsigned char op, int code, int level,
			    Tcl_Obj *returnOpts);
static int		IndexTailVarIfKnown(Tcl_Interp *interp,
			    Tcl_Token *varTokenPtr, CompileEnv *envPtr);
static int		PushVarName(Tcl_Interp *interp,
			    Tcl_Token *varTokenPtr, CompileEnv *envPtr,
			    int flags, int *localIndexPtr,
			    int *simpleVarNamePtr, int *isScalarPtr,
			    int line, int *clNext);
static int		CompileEachloopCmd(Tcl_Interp *interp,
			    Tcl_Parse *parsePtr, Command *cmdPtr,
			    CompileEnv *envPtr, int collect);
static int		CompileDictEachCmd(Tcl_Interp *interp,
			    Tcl_Parse *parsePtr, Command *cmdPtr,
			    struct CompileEnv *envPtr, int collect);


/*
 * Macro that encapsulates an efficiency trick that avoids a function call for
 * the simplest of compiles. The ANSI C "prototype" for this macro is:
 *
 * static void		CompileWord(CompileEnv *envPtr, Tcl_Token *tokenPtr,
 *			    Tcl_Interp *interp, int word);
 */

#define CompileWord(envPtr, tokenPtr, interp, word) \
    if ((tokenPtr)->type == TCL_TOKEN_SIMPLE_WORD) {			\
	TclEmitPush(TclRegisterNewLiteral((envPtr), (tokenPtr)[1].start, \
		(tokenPtr)[1].size), (envPtr));				\
    } else {								\
	envPtr->line = mapPtr->loc[eclIndex].line[word];		\
	envPtr->clNext = mapPtr->loc[eclIndex].next[word];		\
	TclCompileTokens((interp), (tokenPtr)+1, (tokenPtr)->numComponents, \
		(envPtr));						\
    }

/*
 * TIP #280: Remember the per-word line information of the current command. An
 * index is used instead of a pointer as recursive compilation may reallocate,
 * i.e. move, the array. This is also the reason to save the nuloc now, it may
 * change during the course of the function.
 *
 * Macro to encapsulate the variable definition and setup.
 */

#define DefineLineInformation \
    ExtCmdLoc *mapPtr = envPtr->extCmdMapPtr;				\
    int eclIndex = mapPtr->nuloc - 1

#define SetLineInformation(word) \
    envPtr->line = mapPtr->loc[eclIndex].line[(word)];			\
    envPtr->clNext = mapPtr->loc[eclIndex].next[(word)]

#define PushVarNameWord(i,v,e,f,l,s,sc,word) \
    PushVarName(i,v,e,f,l,s,sc,						\
	    mapPtr->loc[eclIndex].line[(word)],				\
	    mapPtr->loc[eclIndex].next[(word)])

/*
 * Often want to issue one of two versions of an instruction based on whether
 * the argument will fit in a single byte or not. This makes it much clearer.
 */

#define Emit14Inst(nm,idx,envPtr) \
    if (idx <= 255) {							\

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr, *valueTokenPtr;
    int simpleVarName, isScalar, localIndex, numWords;
    DefineLineInformation;	/* TIP #280 */

    numWords = parsePtr->numWords;
    if (numWords == 1) {
	return TCL_ERROR;
    } else if (numWords == 2) {
	/*
	 * append varName == set varName

     * slot (entry in the array of local vars) if we are compiling a procedure
     * body and if the name is simple text that does not include namespace
     * qualifiers.
     */

    varTokenPtr = TokenAfter(parsePtr->tokenPtr);

    PushVarNameWord(interp, varTokenPtr, envPtr, 0,
	    &localIndex, &simpleVarName, &isScalar, 1);

    /*
     * We are doing an assignment, otherwise TclCompileSetCmd was called, so
     * push the new value. This will need to be extended to push a value for
     * each argument.
     */

    if (numWords > 2) {
	valueTokenPtr = TokenAfter(varTokenPtr);
	CompileWord(envPtr, valueTokenPtr, interp, 2);
    }

    /*
     * Emit instructions to set/get the variable.
     */

    if (simpleVarName) {

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;
    int simpleVarName, isScalar, localIndex;

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }

    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    PushVarNameWord(interp, tokenPtr, envPtr, TCL_NO_ELEMENT,
	    &localIndex, &simpleVarName, &isScalar, 1);
    if (!isScalar) {
	return TCL_ERROR;
    }

    if (localIndex >= 0) {
	TclEmitInstInt4(INST_ARRAY_EXISTS_IMM, localIndex,	envPtr);
    } else {

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *varTokenPtr, *dataTokenPtr;
    int simpleVarName, isScalar, localIndex;
    int isDataLiteral, isDataValid, isDataEven, len;
    int dataVar, iterVar, keyVar, valVar, infoIndex;
    int back, fwd, offsetBack, offsetFwd, savedStackDepth;
    Tcl_Obj *literalObj;
    ForeachInfo *infoPtr;

    if (parsePtr->numWords != 3) {
	return TCL_ERROR;
    }

    varTokenPtr = TokenAfter(parsePtr->tokenPtr);
    PushVarNameWord(interp, varTokenPtr, envPtr, TCL_NO_ELEMENT,
	    &localIndex, &simpleVarName, &isScalar, 1);
    if (!isScalar) {
	return TCL_ERROR;
    }
    dataTokenPtr = TokenAfter(varTokenPtr);
    literalObj = Tcl_NewObj();
    isDataLiteral = TclWordKnownAtCompileTime(dataTokenPtr, literalObj);
    isDataValid = (isDataLiteral

	Tcl_GetCommandFullName(interp, (Tcl_Command) cmdPtr, objPtr);
	bytes = Tcl_GetStringFromObj(objPtr, &length);
	cmdLit = TclRegisterNewCmdLiteral(envPtr, bytes, length);
	TclSetCmdNameObj(interp, TclFetchLiteral(envPtr, cmdLit), cmdPtr);
	TclEmitPush(cmdLit, envPtr);
	TclDecrRefCount(objPtr);
	if (localIndex >= 0) {
	    CompileWord(envPtr, varTokenPtr, interp, 1);
	} else {
	    TclEmitInstInt4(INST_REVERSE, 2,			envPtr);
	}
	CompileWord(envPtr, dataTokenPtr, interp, 2);
	TclEmitInstInt1(INST_INVOKE_STK1, 3,			envPtr);
	goto done;
    }

    infoPtr = ckalloc(sizeof(ForeachInfo) + sizeof(ForeachVarList *));
    infoPtr->numLists = 1;
    infoPtr->firstValueTemp = dataVar;
    infoPtr->loopCtTemp = iterVar;
    infoPtr->varLists[0] = ckalloc(sizeof(ForeachVarList) * 2*sizeof(int));
    infoPtr->varLists[0]->numVars = 2;
    infoPtr->varLists[0]->varIndexes[0] = keyVar;
    infoPtr->varLists[0]->varIndexes[1] = valVar;
    infoIndex = TclCreateAuxData(infoPtr, &tclForeachInfoType, envPtr);

    /*
     * Start issuing instructions to write to the array.
     */

    CompileWord(envPtr, dataTokenPtr, interp, 2);
    if (!isDataLiteral || !isDataValid) {
	/*
	 * Only need this safety check if we're handling a non-literal or list
	 * containing an invalid literal; with valid list literals, we've
	 * already checked (worth it because literals are a very common
	 * use-case with [array set]).
	 */

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);
    int simpleVarName, isScalar, localIndex, savedStackDepth;

    if (parsePtr->numWords != 2) {
	return TclCompileBasic2ArgCmd(interp, parsePtr, cmdPtr, envPtr);
    }

    PushVarNameWord(interp, tokenPtr, envPtr, TCL_NO_ELEMENT,
	    &localIndex, &simpleVarName, &isScalar, 1);
    if (!isScalar) {
	return TCL_ERROR;
    }

    if (localIndex >= 0) {
	TclEmitInstInt4(INST_ARRAY_EXISTS_IMM, localIndex,	envPtr);
	TclEmitInstInt1(INST_JUMP_FALSE1, 8,			envPtr);

{
    JumpFixup jumpFixup;
    Tcl_Token *cmdTokenPtr, *resultNameTokenPtr, *optsNameTokenPtr;
    const char *name;
    int resultIndex, optsIndex, nameChars, range;
    int initStackDepth = envPtr->currStackDepth;
    int savedStackDepth;
    DefineLineInformation;	/* TIP #280 */

    /*
     * If syntax does not match what we expect for [catch], do not compile.
     * Let runtime checks determine if syntax has changed.
     */

    if ((parsePtr->numWords < 2) || (parsePtr->numWords > 4)) {

     * Care has to be taken to make sure that substitution happens outside the
     * catch range so that errors in the substitution are not caught.
     * [Bug 219184]
     * The reason for duplicating the script is that EVAL_STK would otherwise
     * begin by undeflowing the stack below the mark set by BEGIN_CATCH4.
     */

    SetLineInformation(1);
    if (cmdTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) {
	savedStackDepth = envPtr->currStackDepth;
	TclEmitInstInt4(	INST_BEGIN_CATCH4, range,	envPtr);
	ExceptionRangeStarts(envPtr, range);
	CompileBody(envPtr, cmdTokenPtr, interp);
    } else {
	CompileTokens(envPtr, cmdTokenPtr, interp);

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    int numWords, i;
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *varTokenPtr;
    int dictVarIndex, nameChars;
    const char *name;

    /*
     * There must be at least one argument after the command.
     */

    /*
     * Remaining words (key path and value to set) can be handled normally.
     */

    tokenPtr = TokenAfter(varTokenPtr);
    numWords = parsePtr->numWords-1;
    for (i=1 ; i<numWords ; i++) {
	CompileWord(envPtr, tokenPtr, interp, i);
	tokenPtr = TokenAfter(tokenPtr);
    }

    /*
     * Now emit the instruction to do the dict manipulation.
     */

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *varTokenPtr, *keyTokenPtr;
    int dictVarIndex, nameChars, incrAmount;
    const char *name;

    /*
     * There must be at least two arguments after the command.
     */

	return TclCompileBasic2Or3ArgCmd(interp, parsePtr, cmdPtr, envPtr);
    }

    /*
     * Emit the key and the code to actually do the increment.
     */

    CompileWord(envPtr, keyTokenPtr, interp, 3);
    TclEmitInstInt4( INST_DICT_INCR_IMM, incrAmount,	envPtr);
    TclEmitInt4(     dictVarIndex,			envPtr);
    return TCL_OK;
}

int
TclCompileDictGetCmd(
    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    int numWords, i;
    DefineLineInformation;	/* TIP #280 */

    /*
     * There must be at least two arguments after the command (the single-arg
     * case is legal, but too special and magic for us to deal with here).
     */

    if (parsePtr->numWords < 3) {
	return TCL_ERROR;
    }
    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    numWords = parsePtr->numWords-1;

    /*
     * Only compile this because we need INST_DICT_GET anyway.
     */

    for (i=0 ; i<numWords ; i++) {
	CompileWord(envPtr, tokenPtr, interp, i);
	tokenPtr = TokenAfter(tokenPtr);
    }
    TclEmitInstInt4(INST_DICT_GET, numWords-1, envPtr);
    TclAdjustStackDepth(-1, envPtr);
    return TCL_OK;
}

int
TclCompileDictExistsCmd(
    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    int numWords, i;
    DefineLineInformation;	/* TIP #280 */

    /*
     * There must be at least two arguments after the command (the single-arg
     * case is legal, but too special and magic for us to deal with here).
     */

    if (parsePtr->numWords < 3) {
	return TCL_ERROR;
    }
    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    numWords = parsePtr->numWords-1;

    /*
     * Now we do the code generation.
     */

    for (i=0 ; i<numWords ; i++) {
	CompileWord(envPtr, tokenPtr, interp, i);
	tokenPtr = TokenAfter(tokenPtr);
    }
    TclEmitInstInt4(INST_DICT_EXISTS, numWords-1, envPtr);
    TclAdjustStackDepth(-1, envPtr);
    return TCL_OK;
}

int
TclCompileDictUnsetCmd(
    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    DefineLineInformation;	/* TIP #280 */
    int i, dictVarIndex, nameChars;
    const char *name;

    /*
     * There must be at least one argument after the variable name for us to
     * compile to bytecode.
     */

    /*
     * Remaining words (the key path) can be handled normally.
     */

    for (i=2 ; i<parsePtr->numWords ; i++) {
	tokenPtr = TokenAfter(tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, i);
    }

    /*
     * Now emit the instruction to do the dict manipulation.
     */

    TclEmitInstInt4( INST_DICT_UNSET, parsePtr->numWords-2,	envPtr);
    TclEmitInt4(	dictVarIndex,				envPtr);
    return TCL_OK;
}

int
TclCompileDictCreateCmd(
    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    int worker;			/* Temp var for building the value in. */
    Tcl_Token *tokenPtr;
    Tcl_Obj *keyObj, *valueObj, *dictObj;
    const char *bytes;
    int i, len;

    if ((parsePtr->numWords & 1) == 0) {

    }

    PushLiteral(envPtr,		"", 0);
    Emit14Inst(			INST_STORE_SCALAR, worker,	envPtr);
    TclEmitOpcode(		INST_POP,			envPtr);
    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    for (i=1 ; i<parsePtr->numWords ; i+=2) {
	CompileWord(envPtr, tokenPtr, interp, i);
	tokenPtr = TokenAfter(tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, i+1);
	tokenPtr = TokenAfter(tokenPtr);
	TclEmitInstInt4(	INST_DICT_SET, 1,		envPtr);
	TclEmitInt4(			worker,			envPtr);
	TclAdjustStackDepth(-1, envPtr);
	TclEmitOpcode(		INST_POP,			envPtr);
    }
    Emit14Inst(			INST_LOAD_SCALAR, worker,	envPtr);

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;
    int i, workerIndex, infoIndex, outLoop;

    /*
     * Deal with some special edge cases. Note that in the case with one
     * argument, the only thing to do is to verify the dict-ness.
     */

    if (parsePtr->numWords < 2) {
	PushLiteral(envPtr, "", 0);
	return TCL_OK;
    } else if (parsePtr->numWords == 2) {
	tokenPtr = TokenAfter(parsePtr->tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, 1);
	TclEmitOpcode(		INST_DUP,			envPtr);
	TclEmitOpcode(		INST_DICT_VERIFY,		envPtr);
	return TCL_OK;
    }

    /*
     * There's real merging work to do.

    infoIndex = TclFindCompiledLocal(NULL, 0, 1, envPtr);

    /*
     * Get the first dictionary and verify that it is so.
     */

    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    CompileWord(envPtr, tokenPtr, interp, 1);
    TclEmitOpcode(		INST_DUP,			envPtr);
    TclEmitOpcode(		INST_DICT_VERIFY,		envPtr);
    Emit14Inst(			INST_STORE_SCALAR, workerIndex,	envPtr);
    TclEmitOpcode(		INST_POP,			envPtr);

    /*
     * For each of the remaining dictionaries...
     */

    outLoop = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE);
    TclEmitInstInt4(		INST_BEGIN_CATCH4, outLoop,	envPtr);
    ExceptionRangeStarts(envPtr, outLoop);
    for (i=2 ; i<parsePtr->numWords ; i++) {
	/*
	 * Get the dictionary, and merge its pairs into the first dict (using
	 * a small loop).
	 */

	tokenPtr = TokenAfter(tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, i);
	TclEmitInstInt4(	INST_DICT_FIRST, infoIndex,	envPtr);
	TclEmitInstInt1(	INST_JUMP_TRUE1, 24,		envPtr);
	TclEmitInstInt4(	INST_REVERSE, 2,		envPtr);
	TclEmitInstInt4(	INST_DICT_SET, 1,		envPtr);
	TclEmitInt4(			workerIndex,		envPtr);
	TclAdjustStackDepth(-1, envPtr);
	TclEmitOpcode(		INST_POP,			envPtr);

    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr,		/* Holds resulting instructions. */
    int collect)		/* Flag == TCL_EACH_COLLECT to collect and
				 * construct a new dictionary with the loop
				 * body result. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *varsTokenPtr, *dictTokenPtr, *bodyTokenPtr;
    int keyVarIndex, valueVarIndex, nameChars, loopRange, catchRange;
    int infoIndex, jumpDisplacement, bodyTargetOffset, emptyTargetOffset;
    int numVars, endTargetOffset;
    int collectVar = -1;	/* Index of temp var holding the result
				 * dict. */
    int savedStackDepth = envPtr->currStackDepth;

    }

    /*
     * Get the dictionary and start the iteration. No catching of errors at
     * this point.
     */

    CompileWord(envPtr, dictTokenPtr, interp, 3);
    TclEmitInstInt4(	INST_DICT_FIRST, infoIndex,		envPtr);
    emptyTargetOffset = CurrentOffset(envPtr);
    TclEmitInstInt4(	INST_JUMP_TRUE4, 0,			envPtr);

    /*
     * Now we catch errors from here on so that we can finalize the search
     * started by Tcl_DictObjFirst above.

    loopRange = DeclareExceptionRange(envPtr, LOOP_EXCEPTION_RANGE);
    ExceptionRangeStarts(envPtr, loopRange);

    /*
     * Compile the loop body itself. It should be stack-neutral.
     */

    SetLineInformation(3);
    CompileBody(envPtr, bodyTokenPtr, interp);
    if (collect == TCL_EACH_COLLECT) {
	Emit14Inst(	INST_LOAD_SCALAR, keyVarIndex,		envPtr);
	TclEmitInstInt4(INST_OVER, 1,				envPtr);
	TclEmitInstInt4(INST_DICT_SET, 1,			envPtr);
	TclEmitInt4(		collectVar,			envPtr);
	TclAdjustStackDepth(-1, envPtr);

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    const char *name;
    int i, nameChars, dictIndex, numVars, range, infoIndex;
    Tcl_Token **keyTokenPtrs, *dictVarTokenPtr, *bodyTokenPtr, *tokenPtr;
    int savedStackDepth = envPtr->currStackDepth;
    DictUpdateInfo *duiPtr;
    JumpFixup jumpFixup;

     * The list of variables to bind is stored in auxiliary data so that it
     * can't be snagged by literal sharing and forced to shimmer dangerously.
     */

    infoIndex = TclCreateAuxData(duiPtr, &tclDictUpdateInfoType, envPtr);

    for (i=0 ; i<numVars ; i++) {
	CompileWord(envPtr, keyTokenPtrs[i], interp, i);
    }
    TclEmitInstInt4(	INST_LIST, numVars,			envPtr);
    TclEmitInstInt4(	INST_DICT_UPDATE_START, dictIndex,	envPtr);
    TclEmitInt4(	infoIndex,				envPtr);

    range = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE);
    TclEmitInstInt4(	INST_BEGIN_CATCH4, range,		envPtr);

    ExceptionRangeStarts(envPtr, range);
    envPtr->currStackDepth++;
    SetLineInformation(parsePtr->numWords - 1);
    CompileBody(envPtr, bodyTokenPtr, interp);
    envPtr->currStackDepth = savedStackDepth;
    ExceptionRangeEnds(envPtr, range);

    /*
     * Normal termination code: the stack has the key list below the result of
     * the body evaluation: swap them and finish the update code.

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;
    int i, dictVarIndex;

    /*
     * There must be at least two argument after the command. And we impose an
     * (arbirary) safe limit; anyone exceeding it should stop worrying about
     * speed quite so much. ;-)

    /*
     * Produce the string to concatenate onto the dictionary entry.
     */

    tokenPtr = TokenAfter(tokenPtr);
    for (i=2 ; i<parsePtr->numWords ; i++) {
	CompileWord(envPtr, tokenPtr, interp, i);
	tokenPtr = TokenAfter(tokenPtr);
    }
    if (parsePtr->numWords > 4) {
	TclEmitInstInt1(INST_CONCAT1, parsePtr->numWords-3, envPtr);
    }

    /*

    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *varTokenPtr, *keyTokenPtr, *valueTokenPtr;
    int dictVarIndex, nameChars;
    const char *name;

    /*
     * There must be three arguments after the command.
     */

    if (!TclIsLocalScalar(name, nameChars)) {
	return TclCompileBasic3ArgCmd(interp, parsePtr, cmdPtr, envPtr);
    }
    dictVarIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr);
    if (dictVarIndex < 0) {
	return TclCompileBasic3ArgCmd(interp, parsePtr, cmdPtr, envPtr);
    }
    CompileWord(envPtr, keyTokenPtr, interp, 3);
    CompileWord(envPtr, valueTokenPtr, interp, 4);
    TclEmitInstInt4(	INST_DICT_LAPPEND, dictVarIndex,	envPtr);
    return TCL_OK;
}

int
TclCompileDictWithCmd(
    Tcl_Interp *interp,		/* Used for looking up stuff. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    int i, range, varNameTmp, pathTmp, keysTmp, gotPath, dictVar = -1;
    int bodyIsEmpty = 1;
    Tcl_Token *varTokenPtr, *tokenPtr;
    int savedStackDepth = envPtr->currStackDepth;
    JumpFixup jumpFixup;
    const char *ptr, *end;

	    if (gotPath) {
		/*
		 * Case: Path into dict in LVT with empty body.
		 */

		tokenPtr = TokenAfter(varTokenPtr);
		for (i=2 ; i<parsePtr->numWords-1 ; i++) {
		    CompileWord(envPtr, tokenPtr, interp, i-1);
		    tokenPtr = TokenAfter(tokenPtr);
		}
		TclEmitInstInt4(INST_LIST, parsePtr->numWords-3,envPtr);
		Emit14Inst(	INST_LOAD_SCALAR, dictVar,	envPtr);
		TclEmitInstInt4(INST_OVER, 1,			envPtr);
		TclEmitOpcode(	INST_DICT_EXPAND,		envPtr);
		TclEmitInstInt4(INST_DICT_RECOMBINE_IMM, dictVar, envPtr);

	    if (gotPath) {
		/*
		 * Case: Path into dict in non-simple var with empty body.
		 */

		tokenPtr = varTokenPtr;
		for (i=1 ; i<parsePtr->numWords-1 ; i++) {
		    CompileWord(envPtr, tokenPtr, interp, i-1);
		    tokenPtr = TokenAfter(tokenPtr);
		}
		TclEmitInstInt4(INST_LIST, parsePtr->numWords-3,envPtr);
		TclEmitInstInt4(INST_OVER, 1,			envPtr);
		TclEmitOpcode(	INST_LOAD_STK,			envPtr);
		TclEmitInstInt4(INST_OVER, 1,			envPtr);
		TclEmitOpcode(	INST_DICT_EXPAND,		envPtr);
		TclEmitOpcode(	INST_DICT_RECOMBINE_STK,	envPtr);
		PushLiteral(envPtr, "", 0);
	    } else {
		/*
		 * Case: Direct dict in non-simple var with empty body.
		 */

		CompileWord(envPtr, varTokenPtr, interp, 0);
		TclEmitOpcode(	INST_DUP,			envPtr);
		TclEmitOpcode(	INST_LOAD_STK,			envPtr);
		PushLiteral(envPtr, "", 0);
		TclEmitOpcode(	INST_DICT_EXPAND,		envPtr);
		PushLiteral(envPtr, "", 0);
		TclEmitInstInt4(INST_REVERSE, 2,		envPtr);
		TclEmitOpcode(	INST_DICT_RECOMBINE_STK,	envPtr);

    keysTmp = TclFindCompiledLocal(NULL, 0, 1, envPtr);

    /*
     * Issue instructions. First, the part to expand the dictionary.
     */

    if (varNameTmp > -1) {
	CompileWord(envPtr, varTokenPtr, interp, 0);
	Emit14Inst(		INST_STORE_SCALAR, varNameTmp,	envPtr);
    }
    tokenPtr = TokenAfter(varTokenPtr);
    if (gotPath) {
	for (i=2 ; i<parsePtr->numWords-1 ; i++) {
	    CompileWord(envPtr, tokenPtr, interp, i-1);
	    tokenPtr = TokenAfter(tokenPtr);
	}
	TclEmitInstInt4(	INST_LIST, parsePtr->numWords-3,envPtr);
	Emit14Inst(		INST_STORE_SCALAR, pathTmp,	envPtr);
	TclEmitOpcode(		INST_POP,			envPtr);
    }
    if (dictVar == -1) {

     */

    range = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE);
    TclEmitInstInt4(		INST_BEGIN_CATCH4, range,	envPtr);

    ExceptionRangeStarts(envPtr, range);
    envPtr->currStackDepth++;
    SetLineInformation(parsePtr->numWords-1);
    CompileBody(envPtr, tokenPtr, interp);
    envPtr->currStackDepth = savedStackDepth;
    ExceptionRangeEnds(envPtr, range);

    /*
     * Now fold the results back into the dictionary in the OK case.
     */

{
    /*
     * General syntax: [error message ?errorInfo? ?errorCode?]
     * However, we only deal with the case where there is just a message.
     */
    Tcl_Token *messageTokenPtr;
    int savedStackDepth = envPtr->currStackDepth;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }
    messageTokenPtr = TokenAfter(parsePtr->tokenPtr);

    PushLiteral(envPtr, "-code error -level 0", 20);
    CompileWord(envPtr, messageTokenPtr, interp, 1);
    TclEmitOpcode(INST_RETURN_STK, envPtr);
    envPtr->currStackDepth = savedStackDepth + 1;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------

{
    Tcl_Token *firstWordPtr;

    if (parsePtr->numWords == 1) {
	return TCL_ERROR;
    }

    /*
     * TIP #280: Use the per-word line information of the current command.
     */

    envPtr->line = envPtr->extCmdMapPtr->loc[
	    envPtr->extCmdMapPtr->nuloc-1].line[1];

    firstWordPtr = TokenAfter(parsePtr->tokenPtr);
    TclCompileExprWords(interp, firstWordPtr, parsePtr->numWords-1, envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------

    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *startTokenPtr, *testTokenPtr, *nextTokenPtr, *bodyTokenPtr;
    JumpFixup jumpEvalCondFixup;
    int testCodeOffset, bodyCodeOffset, nextCodeOffset, jumpDist;
    int bodyRange, nextRange;
    int savedStackDepth = envPtr->currStackDepth;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 5) {
	return TCL_ERROR;
    }

    /*
     * If the test expression requires substitutions, don't compile the for

    bodyRange = DeclareExceptionRange(envPtr, LOOP_EXCEPTION_RANGE);
    nextRange = TclCreateExceptRange(LOOP_EXCEPTION_RANGE, envPtr);

    /*
     * Inline compile the initial command.
     */

    SetLineInformation(1);
    CompileBody(envPtr, startTokenPtr, interp);
    TclEmitOpcode(INST_POP, envPtr);

    /*
     * Jump to the evaluation of the condition. This code uses the "loop
     * rotation" optimisation (which eliminates one branch from the loop).
     * "for start cond next body" produces then:

    TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpEvalCondFixup);

    /*
     * Compile the loop body.
     */

    bodyCodeOffset = ExceptionRangeStarts(envPtr, bodyRange);
    SetLineInformation(4);
    CompileBody(envPtr, bodyTokenPtr, interp);
    ExceptionRangeEnds(envPtr, bodyRange);
    envPtr->currStackDepth = savedStackDepth + 1;
    TclEmitOpcode(INST_POP, envPtr);

    /*
     * Compile the "next" subcommand.
     */

    envPtr->currStackDepth = savedStackDepth;
    nextCodeOffset = ExceptionRangeStarts(envPtr, nextRange);
    SetLineInformation(3);
    CompileBody(envPtr, nextTokenPtr, interp);
    ExceptionRangeEnds(envPtr, nextRange);
    envPtr->currStackDepth = savedStackDepth + 1;
    TclEmitOpcode(INST_POP, envPtr);
    envPtr->currStackDepth = savedStackDepth;

    /*
     * Compile the test expression then emit the conditional jump that
     * terminates the for.
     */

    testCodeOffset = CurrentOffset(envPtr);

    jumpDist = testCodeOffset - jumpEvalCondFixup.codeOffset;
    if (TclFixupForwardJump(envPtr, &jumpEvalCondFixup, jumpDist, 127)) {
	bodyCodeOffset += 3;
	nextCodeOffset += 3;
	testCodeOffset += 3;
    }

    SetLineInformation(2);
    envPtr->currStackDepth = savedStackDepth;
    TclCompileExprWords(interp, testTokenPtr, 1, envPtr);
    envPtr->currStackDepth = savedStackDepth + 1;

    jumpDist = CurrentOffset(envPtr) - bodyCodeOffset;
    if (jumpDist > 127) {
	TclEmitInstInt4(INST_JUMP_TRUE4, -jumpDist, envPtr);

				 * iteration count. */
    int collectVar = -1;	/* Index of temp var holding the result var
				 * index. */

    Tcl_Token *tokenPtr, *bodyTokenPtr;
    unsigned char *jumpPc;
    JumpFixup jumpFalseFixup;
    int jumpBackDist, jumpBackOffset, infoIndex, range, bodyIndex;
    int numWords, numLists, numVars, loopIndex, tempVar, i, j, code;
    int savedStackDepth = envPtr->currStackDepth;
    DefineLineInformation;	/* TIP #280 */

    /*
     * We parse the variable list argument words and create two arrays:
     *    varcList[i] is number of variables in i-th var list.
     *    varvList[i] points to array of var names in i-th var list.
     */

	tokenPtr = TokenAfter(tokenPtr);
    }
    bodyTokenPtr = tokenPtr;
    if (bodyTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
	return TCL_ERROR;
    }

    bodyIndex = i-1;

    /*
     * Allocate storage for the varcList and varvList arrays if necessary.
     */

    numLists = (numWords - 2)/2;
    varcList = TclStackAlloc(interp, numLists * sizeof(int));
    memset(varcList, 0, numLists * sizeof(int));

     */

    loopIndex = 0;
    for (i = 0, tokenPtr = parsePtr->tokenPtr;
	    i < numWords-1;
	    i++, tokenPtr = TokenAfter(tokenPtr)) {
	if ((i%2 == 0) && (i > 0)) {
	    SetLineInformation(i);
	    CompileTokens(envPtr, tokenPtr, interp);
	    tempVar = (firstValueTemp + loopIndex);
	    Emit14Inst(		INST_STORE_SCALAR, tempVar,	envPtr);
	    TclEmitOpcode(	INST_POP,			envPtr);
	    loopIndex++;
	}
    }

    TclEmitInstInt4(		INST_FOREACH_STEP4, infoIndex,	envPtr);
    TclEmitForwardJump(envPtr, TCL_FALSE_JUMP, &jumpFalseFixup);

    /*
     * Inline compile the loop body.
     */

    SetLineInformation(bodyIndex);
    ExceptionRangeStarts(envPtr, range);
    CompileBody(envPtr, bodyTokenPtr, interp);
    ExceptionRangeEnds(envPtr, range);
    envPtr->currStackDepth = savedStackDepth + 1;

    if (collect == TCL_EACH_COLLECT) {
	Emit14Inst(		INST_LAPPEND_SCALAR, collectVar,envPtr);

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr = parsePtr->tokenPtr;
    Tcl_Obj **objv, *formatObj, *tmpObj;
    char *bytes, *start;
    int i, j, len;

    /*
     * Don't handle any guaranteed-error cases.

		/*
		 * Push the code to produce the string that would be
		 * substituted with %s, except we'll be concatenating
		 * directly.
		 */

		CompileWord(envPtr, tokenPtr, interp, j);
		tokenPtr = TokenAfter(tokenPtr);
		j++;
		i++;
	    }
	    start = bytes + 1;
	}
    }

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr;
    int localIndex, numWords, i;
    DefineLineInformation;	/* TIP #280 */

    numWords = parsePtr->numWords;
    if (numWords < 2) {
	return TCL_ERROR;
    }

    /*

    for (i=2; i<=numWords; varTokenPtr = TokenAfter(varTokenPtr),i++) {
	localIndex = IndexTailVarIfKnown(interp, varTokenPtr, envPtr);

	if (localIndex < 0) {
	    return TCL_ERROR;
	}

	CompileWord(envPtr, varTokenPtr, interp, 1);
	TclEmitInstInt4(	INST_NSUPVAR, localIndex,	envPtr);
    }

    /*
     * Pop the namespace, and set the result to empty
     */

				/* Saved stack depth at the start of the first
				 * test; the envPtr current depth is restored
				 * to this value at the start of each test. */
    int realCond = 1;		/* Set to 0 for static conditions:
				 * "if 0 {..}" */
    int boolVal;		/* Value of static condition. */
    int compileScripts = 1;
    DefineLineInformation;	/* TIP #280 */

    /*
     * Only compile the "if" command if all arguments are simple words, in
     * order to insure correct substitution [Bug 219166]
     */

    tokenPtr = parsePtr->tokenPtr;

		 */

		realCond = 0;
		if (!boolVal) {
		    compileScripts = 0;
		}
	    } else {
		SetLineInformation(wordIdx);
		Tcl_ResetResult(interp);
		TclCompileExprWords(interp, testTokenPtr, 1, envPtr);
		if (jumpFalseFixupArray.next >= jumpFalseFixupArray.end) {
		    TclExpandJumpFixupArray(&jumpFalseFixupArray);
		}
		jumpIndex = jumpFalseFixupArray.next;
		jumpFalseFixupArray.next++;

	}

	/*
	 * Compile the "then" command body.
	 */

	if (compileScripts) {
	    SetLineInformation(wordIdx);
	    envPtr->currStackDepth = savedStackDepth;
	    CompileBody(envPtr, tokenPtr, interp);
	}

	if (realCond) {
	    /*
	     * Jump to the end of the "if" command. Both jumpFalseFixupArray

	}

	if (compileScripts) {
	    /*
	     * Compile the else command body.
	     */

	    SetLineInformation(wordIdx);
	    CompileBody(envPtr, tokenPtr, interp);
	}

	/*
	 * Make sure there are no words after the else clause.
	 */

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr, *incrTokenPtr;
    int simpleVarName, isScalar, localIndex, haveImmValue, immValue;
    DefineLineInformation;	/* TIP #280 */

    if ((parsePtr->numWords != 2) && (parsePtr->numWords != 3)) {
	return TCL_ERROR;
    }

    varTokenPtr = TokenAfter(parsePtr->tokenPtr);

    PushVarNameWord(interp, varTokenPtr, envPtr, TCL_NO_LARGE_INDEX,
	    &localIndex, &simpleVarName, &isScalar, 1);

    /*
     * If an increment is given, push it, but see first if it's a small
     * integer.
     */

    haveImmValue = 0;

	    if ((code == TCL_OK) && (-127 <= immValue) && (immValue <= 127)) {
		haveImmValue = 1;
	    }
	    if (!haveImmValue) {
		PushLiteral(envPtr, word, numBytes);
	    }
	} else {
	    SetLineInformation(2);
	    CompileTokens(envPtr, incrTokenPtr, interp);
	}
    } else {			/* No incr amount given so use 1. */
	haveImmValue = 1;
    }

    /*

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;
    Tcl_Obj *objPtr;
    char *bytes;

    /*
     * We require one compile-time known argument for the case we can compile.
     */

    Tcl_DecrRefCount(objPtr);

    /*
     * Confirmed as a literal that will not frighten the horses. Compile. Note
     * that the result needs to be list-ified.
     */

    CompileWord(envPtr, tokenPtr,		interp, 1);
    TclEmitOpcode(	INST_RESOLVE_COMMAND,	envPtr);
    TclEmitOpcode(	INST_DUP,		envPtr);
    TclEmitOpcode(	INST_STR_LEN,		envPtr);
    TclEmitInstInt1(	INST_JUMP_FALSE1, 7,	envPtr);
    TclEmitInstInt4(	INST_LIST, 1,		envPtr);
    return TCL_OK;

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    int isScalar, simpleVarName, localIndex;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }

    /*
     * Decide if we can use a frame slot for the var/array name or if we need
     * to emit code to compute and push the name at runtime. We use a frame
     * slot (entry in the array of local vars) if we are compiling a procedure
     * body and if the name is simple text that does not include namespace
     * qualifiers.
     */

    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    PushVarNameWord(interp, tokenPtr, envPtr, 0, &localIndex,
	    &simpleVarName, &isScalar, 1);

    /*
     * Emit instruction to check the variable for existence.
     */

    if (!simpleVarName) {
	TclEmitOpcode(		INST_EXIST_STK,			envPtr);

	 * Not much to do; we compile to a single instruction...
	 */

	TclEmitOpcode(		INST_INFO_LEVEL_NUM,		envPtr);
    } else if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    } else {
	DefineLineInformation;	/* TIP #280 */

	/*
	 * Compile the argument, then add the instruction to convert it into a
	 * list of arguments.
	 */

	SetLineInformation(1);
	CompileTokens(envPtr, TokenAfter(parsePtr->tokenPtr), interp);
	TclEmitOpcode(		INST_INFO_LEVEL_ARGS,		envPtr);
    }
    return TCL_OK;
}

int
TclCompileInfoObjectClassCmd(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }
    CompileWord(envPtr,		tokenPtr,		interp, 1);
    TclEmitOpcode(		INST_TCLOO_CLASS,	envPtr);
    return TCL_OK;
}

int
TclCompileInfoObjectIsACmd(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);

    /*
     * We only handle [info object isa object <somevalue>]. The first three
     * words are compressed to a single token by the ensemble compilation
     * engine.
     */

    }
    tokenPtr = TokenAfter(tokenPtr);

    /*
     * Issue the code.
     */

    CompileWord(envPtr,		tokenPtr,		interp, 2);
    TclEmitOpcode(		INST_TCLOO_IS_OBJECT,	envPtr);
    return TCL_OK;
}

int
TclCompileInfoObjectNamespaceCmd(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }
    CompileWord(envPtr,		tokenPtr,		interp, 1);
    TclEmitOpcode(		INST_TCLOO_NS,		envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr;
    int simpleVarName, isScalar, localIndex, numWords;
    DefineLineInformation;	/* TIP #280 */

    /*
     * If we're not in a procedure, don't compile.
     */

    if (envPtr->procPtr == NULL) {
	return TCL_ERROR;

     * frame slot (entry in the array of local vars) if we are compiling a
     * procedure body and if the name is simple text that does not include
     * namespace qualifiers.
     */

    varTokenPtr = TokenAfter(parsePtr->tokenPtr);

    PushVarNameWord(interp, varTokenPtr, envPtr, 0,
	    &localIndex, &simpleVarName, &isScalar, 1);

    /*
     * If we are doing an assignment, push the new value. In the no values
     * case, create an empty object.
     */

    if (numWords > 2) {
	Tcl_Token *valueTokenPtr = TokenAfter(varTokenPtr);

	CompileWord(envPtr, valueTokenPtr, interp, 2);
    }

    /*
     * Emit instructions to set/get the variable.
     */

    /*

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    int simpleVarName, isScalar, localIndex, numWords, idx;
    DefineLineInformation;	/* TIP #280 */

    numWords = parsePtr->numWords;

    /*
     * Check for command syntax error, but we'll punt that to runtime.
     */

    if (numWords < 3) {
	return TCL_ERROR;
    }

    /*
     * Generate code to push list being taken apart by [lassign].
     */

    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    CompileWord(envPtr, tokenPtr, interp, 1);

    /*
     * Generate code to assign values from the list to variables.
     */

    for (idx=0 ; idx<numWords-2 ; idx++) {
	tokenPtr = TokenAfter(tokenPtr);

	/*
	 * Generate the next variable name.
	 */

	PushVarNameWord(interp, tokenPtr, envPtr, 0, &localIndex,
		&simpleVarName, &isScalar, idx+2);

	/*
	 * Emit instructions to get the idx'th item out of the list value on
	 * the stack and assign it to the variable.
	 */

	if (!simpleVarName) {

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *idxTokenPtr, *valTokenPtr;
    int i, numWords = parsePtr->numWords;
    DefineLineInformation;	/* TIP #280 */

    /*
     * Quit if too few args.
     */

    if (numWords <= 1) {
	return TCL_ERROR;

	     * these constructs:
	     *	 lindex <arbitraryValue> <posInt>
	     *	 lindex <arbitraryValue> end-<posInt>
	     * This is best compiled as a push of the arbitrary value followed
	     * by an "immediate lindex" which is the most efficient variety.
	     */

	    CompileWord(envPtr, valTokenPtr, interp, 1);
	    TclEmitInstInt4(	INST_LIST_INDEX_IMM, idx,	envPtr);
	    return TCL_OK;
	}

	/*
	 * If the conversion failed or the value was negative, we just keep on
	 * going with the more complex compilation.
	 */
    }

    /*
     * Push the operands onto the stack.
     */

  emitComplexLindex:
    for (i=1 ; i<numWords ; i++) {
	CompileWord(envPtr, valTokenPtr, interp, i);
	valTokenPtr = TokenAfter(valTokenPtr);
    }

    /*
     * Emit INST_LIST_INDEX if objc==3, or INST_LIST_INDEX_MULTI if there are
     * multiple index args.
     */

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *valueTokenPtr;
    int i, numWords;

    /*
     * If we're not in a procedure, don't compile.
     */

	/*
	 * Push the all values onto the stack.
	 */

	numWords = parsePtr->numWords;
	valueTokenPtr = TokenAfter(parsePtr->tokenPtr);
	for (i = 1; i < numWords; i++) {
	    CompileWord(envPtr, valueTokenPtr, interp, i);
	    valueTokenPtr = TokenAfter(valueTokenPtr);
	}
	TclEmitInstInt4(	INST_LIST, numWords - 1,	envPtr);
    }

    return TCL_OK;
}

    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }
    varTokenPtr = TokenAfter(parsePtr->tokenPtr);

    CompileWord(envPtr, varTokenPtr, interp, 1);
    TclEmitOpcode(		INST_LIST_LENGTH,		envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *

    Tcl_Parse *parsePtr,	/* Points to a parse structure for the
				 * command. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_Token *tokenPtr, *listTokenPtr;
    DefineLineInformation;	/* TIP #280 */
    Tcl_Obj *tmpObj;
    int idx1, idx2, result;

    if (parsePtr->numWords != 4) {
	return TCL_ERROR;
    }
    listTokenPtr = TokenAfter(parsePtr->tokenPtr);

    /*
     * Issue instructions. It's not safe to skip doing the LIST_RANGE, as
     * we've not proved that the 'list' argument is really a list. Not that it
     * is worth trying to do that given current knowledge.
     */

    CompileWord(envPtr, listTokenPtr, interp, 1);
    TclEmitInstInt4(		INST_LIST_RANGE_IMM, idx1,	envPtr);
    TclEmitInt4(		idx2,				envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------

    Tcl_Parse *parsePtr,	/* Points to a parse structure for the
				 * command. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_Token *tokenPtr, *listTokenPtr;
    DefineLineInformation;	/* TIP #280 */
    Tcl_Obj *tmpObj;
    int idx1, idx2, result, guaranteedDropAll = 0;

    if (parsePtr->numWords != 4) {
	return TCL_ERROR;
    }
    listTokenPtr = TokenAfter(parsePtr->tokenPtr);

    /*
     * Issue instructions. It's not safe to skip doing the LIST_RANGE, as
     * we've not proved that the 'list' argument is really a list. Not that it
     * is worth trying to do that given current knowledge.
     */

    CompileWord(envPtr, listTokenPtr, interp, 1);
    if (guaranteedDropAll) {
	TclEmitOpcode(		INST_LIST_LENGTH,		envPtr);
	TclEmitOpcode(		INST_POP,			envPtr);
	PushLiteral(envPtr, "", 0);
    } else {
	TclEmitInstInt4(	INST_LIST_RANGE_IMM, idx1,	envPtr);
	TclEmitInt4(		idx2,				envPtr);

				 * code burst. */
    Tcl_Token *varTokenPtr;	/* Pointer to the Tcl_Token representing the
				 * parse of the variable name. */
    int localIndex;		/* Index of var in local var table. */
    int simpleVarName;		/* Flag == 1 if var name is simple. */
    int isScalar;		/* Flag == 1 if scalar, 0 if array. */
    int i;
    DefineLineInformation;	/* TIP #280 */

    /*
     * Check argument count.
     */

    if (parsePtr->numWords < 3) {
	/*

     * to emit code to compute and push the name at runtime. We use a frame
     * slot (entry in the array of local vars) if we are compiling a procedure
     * body and if the name is simple text that does not include namespace
     * qualifiers.
     */

    varTokenPtr = TokenAfter(parsePtr->tokenPtr);
    PushVarNameWord(interp, varTokenPtr, envPtr, 0,
	    &localIndex, &simpleVarName, &isScalar, 1);

    /*
     * Push the "index" args and the new element value.
     */

    for (i=2 ; i<parsePtr->numWords ; ++i) {
	varTokenPtr = TokenAfter(varTokenPtr);
	CompileWord(envPtr, varTokenPtr, interp, i);
    }

    /*
     * Duplicate the variable name if it's been pushed.
     */

    if (!simpleVarName || localIndex < 0) {

    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }
    tokenPtr = TokenAfter(parsePtr->tokenPtr);

    /*

     * name directly here, because TclOO plays complex games with namespaces;
     * the value needs to be determined at runtime for safety.
     */

    PushLiteral(envPtr,		"::namespace",		11);
    PushLiteral(envPtr,		"inscope",		7);
    TclEmitOpcode(		INST_NS_CURRENT,	envPtr);
    CompileWord(envPtr,		tokenPtr,		interp, 1);
    TclEmitInstInt4(		INST_LIST, 4,		envPtr);
    return TCL_OK;
}

int
TclCompileNamespaceQualifiersCmd(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);
    DefineLineInformation;	/* TIP #280 */
    int off;

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }

    CompileWord(envPtr, tokenPtr, interp, 1);
    PushLiteral(envPtr, "0", 1);
    PushLiteral(envPtr, "::", 2);
    TclEmitInstInt4(	INST_OVER, 2,			envPtr);
    TclEmitOpcode(	INST_STR_FIND_LAST,		envPtr);
    off = CurrentOffset(envPtr);
    PushLiteral(envPtr, "1", 1);
    TclEmitOpcode(	INST_SUB,			envPtr);

    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);
    DefineLineInformation;	/* TIP #280 */
    JumpFixup jumpFixup;

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }

    /*
     * Take care; only add 2 to found index if the string was actually found.
     */

    CompileWord(envPtr, tokenPtr, interp, 1);
    PushLiteral(envPtr, "::", 2);
    TclEmitInstInt4(	INST_OVER, 1,			envPtr);
    TclEmitOpcode(	INST_STR_FIND_LAST,		envPtr);
    TclEmitOpcode(	INST_DUP,			envPtr);
    PushLiteral(envPtr, "0", 1);
    TclEmitOpcode(	INST_GE,			envPtr);
    TclEmitForwardJump(envPtr, TCL_FALSE_JUMP, &jumpFixup);

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr, *otherTokenPtr, *localTokenPtr;
    int simpleVarName, isScalar, localIndex, numWords, i;
    DefineLineInformation;	/* TIP #280 */

    if (envPtr->procPtr == NULL) {
	return TCL_ERROR;
    }

    /*
     * Only compile [namespace upvar ...]: needs an even number of args, >=4
     */

    numWords = parsePtr->numWords;
    if ((numWords % 2) || (numWords < 4)) {
	return TCL_ERROR;
    }

    /*
     * Push the namespace
     */

    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    CompileWord(envPtr, tokenPtr, interp, 1);

    /*
     * Loop over the (otherVar, thisVar) pairs. If any of the thisVar is not a
     * local variable, return an error so that the non-compiled command will
     * be called at runtime.
     */

    localTokenPtr = tokenPtr;
    for (i=3; i<=numWords; i+=2) {
	otherTokenPtr = TokenAfter(localTokenPtr);
	localTokenPtr = TokenAfter(otherTokenPtr);

	CompileWord(envPtr, otherTokenPtr, interp, 1);
	PushVarNameWord(interp, localTokenPtr, envPtr, 0,
		&localIndex, &simpleVarName, &isScalar, 1);

	if ((localIndex < 0) || !isScalar) {
	    return TCL_ERROR;
	}
	TclEmitInstInt4(	INST_NSUPVAR, localIndex,	envPtr);
    }

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr, *opt;
    int idx;

    if (parsePtr->numWords < 2 || parsePtr->numWords > 3) {
	return TCL_ERROR;
    }
    tokenPtr = TokenAfter(parsePtr->tokenPtr);

	idx++;
    }

    /*
     * Issue the bytecode.
     */

    CompileWord(envPtr,		tokenPtr,		interp, idx);
    TclEmitOpcode(		INST_RESOLVE_COMMAND,	envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *

				 * compiled. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_Token *varTokenPtr;	/* Pointer to the Tcl_Token representing the
				 * parse of the RE or string. */
    int i, len, nocase, exact, sawLast, simple;
    const char *str;
    DefineLineInformation;	/* TIP #280 */

    /*
     * We are only interested in compiling simple regexp cases. Currently
     * supported compile cases are:
     *   regexp ?-nocase? ?--? staticString $var
     *   regexp ?-nocase? ?--? {^staticString$} $var
     */

	    simple = 1;
	    PushLiteral(envPtr, Tcl_DStringValue(&ds),Tcl_DStringLength(&ds));
	    Tcl_DStringFree(&ds);
	}
    }

    if (!simple) {
	CompileWord(envPtr, varTokenPtr, interp, parsePtr->numWords-2);
    }

    /*
     * Push the string arg.
     */

    varTokenPtr = TokenAfter(varTokenPtr);
    CompileWord(envPtr, varTokenPtr, interp, parsePtr->numWords-1);

    if (simple) {
	if (exact && !nocase) {
	    TclEmitOpcode(	INST_STR_EQ,			envPtr);
	} else {
	    TclEmitInstInt1(	INST_STR_MATCH, nocase,		envPtr);
	}

     * In short, we look for:
     *
     *   regsub -all [--] simpleRE string simpleReplacement
     *
     * The only optional part is the "--", and no other options are handled.
     */

    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr, *stringTokenPtr;
    Tcl_Obj *patternObj = NULL, *replacementObj = NULL;
    Tcl_DString pattern;
    const char *bytes;
    int len, exact, result = TCL_ERROR;

    if (parsePtr->numWords < 5 || parsePtr->numWords > 6) {

     */

    result = TCL_OK;
    bytes = Tcl_DStringValue(&pattern) + 1;
    PushLiteral(envPtr,	bytes, len);
    bytes = Tcl_GetStringFromObj(replacementObj, &len);
    PushLiteral(envPtr,	bytes, len);
    CompileWord(envPtr,	stringTokenPtr, interp, parsePtr->numWords-2);
    TclEmitOpcode(	INST_STR_MAP,	envPtr);

  done:
    Tcl_DStringFree(&pattern);
    if (patternObj) {
	Tcl_DecrRefCount(patternObj);
    }

    int level, code, objc, size, status = TCL_OK;
    int numWords = parsePtr->numWords;
    int explicitResult = (0 == (numWords % 2));
    int numOptionWords = numWords - 1 - explicitResult;
    int savedStackDepth = envPtr->currStackDepth;
    Tcl_Obj *returnOpts, **objv;
    Tcl_Token *wordTokenPtr = TokenAfter(parsePtr->tokenPtr);
    DefineLineInformation;	/* TIP #280 */

    /*
     * Check for special case which can always be compiled:
     *	    return -options <opts> <msg>
     * Unlike the normal [return] compilation, this version does everything at
     * runtime so it can handle arbitrary words and not just literals. Note
     * that if INST_RETURN_STK wasn't already needed for something else
     * ('finally' clause processing) this piece of code would not be present.
     */

    if ((numWords == 4) && (wordTokenPtr->type == TCL_TOKEN_SIMPLE_WORD)
	    && (wordTokenPtr[1].size == 8)
	    && (strncmp(wordTokenPtr[1].start, "-options", 8) == 0)) {
	Tcl_Token *optsTokenPtr = TokenAfter(wordTokenPtr);
	Tcl_Token *msgTokenPtr = TokenAfter(optsTokenPtr);

	CompileWord(envPtr, optsTokenPtr, interp, 2);
	CompileWord(envPtr, msgTokenPtr,  interp, 3);
	TclEmitOpcode(INST_RETURN_STK, envPtr);
	envPtr->currStackDepth = savedStackDepth + 1;
	return TCL_OK;
    }

    /*
     * Allocate some working space.

    /*
     * All options are known at compile time, so we're going to bytecompile.
     * Emit instructions to push the result on the stack.
     */

    if (explicitResult) {
	 CompileWord(envPtr, wordTokenPtr, interp, numWords-1);
    } else {
	/*
	 * No explict result argument, so default result is empty string.
	 */

	PushLiteral(envPtr, "", 0);
    }

    Tcl_Interp *interp,
    CompileEnv *envPtr)
{
    Tcl_Obj *msg = Tcl_GetObjResult(interp);
    int numBytes;
    const char *bytes = TclGetStringFromObj(msg, &numBytes);

    TclErrorStackResetIf(interp, bytes, numBytes);
    TclEmitPush(TclRegisterNewLiteral(envPtr, bytes, numBytes), envPtr);
    CompileReturnInternal(envPtr, INST_SYNTAX, TCL_ERROR, 0,
	    TclNoErrorStack(interp, Tcl_GetReturnOptions(interp, TCL_ERROR)));
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileUpvarCmd --
 *

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr, *otherTokenPtr, *localTokenPtr;
    int simpleVarName, isScalar, localIndex, numWords, i;
    DefineLineInformation;	/* TIP #280 */
    Tcl_Obj *objPtr = Tcl_NewObj();

    if (envPtr->procPtr == NULL) {
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;
    }

	newTypePtr = objPtr->typePtr;
	Tcl_DecrRefCount(objPtr);

	if (newTypePtr != typePtr) {
	    if (numWords%2) {
		return TCL_ERROR;
	    }
	    CompileWord(envPtr, tokenPtr, interp, 1);
	    otherTokenPtr = TokenAfter(tokenPtr);
	    i = 4;
	} else {
	    if (!(numWords%2)) {
		return TCL_ERROR;
	    }
	    PushLiteral(envPtr, "1", 1);

     * local variable, return an error so that the non-compiled command will
     * be called at runtime.
     */

    for (; i<=numWords; i+=2, otherTokenPtr = TokenAfter(localTokenPtr)) {
	localTokenPtr = TokenAfter(otherTokenPtr);

	CompileWord(envPtr, otherTokenPtr, interp, 1);
	PushVarNameWord(interp, localTokenPtr, envPtr, 0,
		&localIndex, &simpleVarName, &isScalar, 1);

	if ((localIndex < 0) || !isScalar) {
	    return TCL_ERROR;
	}
	TclEmitInstInt4(	INST_UPVAR, localIndex,		envPtr);
    }

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr, *valueTokenPtr;
    int localIndex, numWords, i;
    DefineLineInformation;	/* TIP #280 */

    numWords = parsePtr->numWords;
    if (numWords < 2) {
	return TCL_ERROR;
    }

    /*

	localIndex = IndexTailVarIfKnown(interp, varTokenPtr, envPtr);

	if (localIndex < 0) {
	    return TCL_ERROR;
	}

	CompileWord(envPtr, varTokenPtr, interp, i);
	TclEmitInstInt4(	INST_VARIABLE, localIndex,	envPtr);

	if (i+1 < numWords) {
	    /*
	     * A value has been given: set the variable, pop the value
	     */

	    CompileWord(envPtr, valueTokenPtr, interp, i+1);
	    Emit14Inst(		INST_STORE_SCALAR, localIndex,	envPtr);
	    TclEmitOpcode(	INST_POP,			envPtr);
	}
    }

    /*
     * Set the result to empty

PushVarName(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Token *varTokenPtr,	/* Points to a variable token. */
    CompileEnv *envPtr,		/* Holds resulting instructions. */
    int flags,			/* TCL_NO_LARGE_INDEX | TCL_NO_ELEMENT. */
    int *localIndexPtr,		/* Must not be NULL. */
    int *simpleVarNamePtr,	/* Must not be NULL. */
    int *isScalarPtr,		/* Must not be NULL. */
    int line,			/* Line the token starts on. */
    int *clNext)		/* Reference to offset of next hidden cont.
				 * line. */
{
    register const char *p;
    const char *name, *elName;
    register int i, n;
    Tcl_Token *elemTokenPtr = NULL;
    int nameChars, elNameChars, simpleVarName, localIndex;
    int elemTokenCount = 0, allocedTokens = 0, removedParen = 0;

	/*
	 * Compile the element script, if any, and only if not inhibited. [Bug
	 * 3600328]
	 */

	if (elName != NULL && !(flags & TCL_NO_ELEMENT)) {
	    if (elNameChars) {
		envPtr->line = line;
		envPtr->clNext = clNext;
		TclCompileTokens(interp, elemTokenPtr, elemTokenCount,
			envPtr);
	    } else {
		PushLiteral(envPtr, "", 0);
	    }
	}
    } else {
	/*
	 * The var name isn't simple: compile and push it.
	 */

	envPtr->line = line;
	envPtr->clNext = clNext;
	CompileTokens(envPtr, varTokenPtr, interp);
    }

    if (removedParen) {
	varTokenPtr[removedParen].size++;
    }
    if (allocedTokens) {

static void		FreeJumptableInfo(ClientData clientData);
static void		PrintJumptableInfo(ClientData clientData,
			    Tcl_Obj *appendObj, ByteCode *codePtr,
			    unsigned int pcOffset);
static int		PushVarName(Tcl_Interp *interp,
			    Tcl_Token *varTokenPtr, CompileEnv *envPtr,
			    int flags, int *localIndexPtr,
			    int *simpleVarNamePtr, int *isScalarPtr,
			    int line, int *clNext);
static int		CompileAssociativeBinaryOpCmd(Tcl_Interp *interp,
			    Tcl_Parse *parsePtr, const char *identity,
			    int instruction, CompileEnv *envPtr);
static int		CompileComparisonOpCmd(Tcl_Interp *interp,
			    Tcl_Parse *parsePtr, int instruction,
			    CompileEnv *envPtr);
static int		CompileStrictlyBinaryOpCmd(Tcl_Interp *interp,
			    Tcl_Parse *parsePtr, int instruction,
			    CompileEnv *envPtr);
static int		CompileUnaryOpCmd(Tcl_Interp *interp,
			    Tcl_Parse *parsePtr, int instruction,
			    CompileEnv *envPtr);
static void		IssueSwitchChainedTests(Tcl_Interp *interp,
			    CompileEnv *envPtr, ExtCmdLoc *mapPtr,
			    int eclIndex, int mode, int noCase,
			    int valueIndex, Tcl_Token *valueTokenPtr,
			    int numWords, Tcl_Token **bodyToken,
			    int *bodyLines, int **bodyNext);
static void		IssueSwitchJumpTable(Tcl_Interp *interp,
			    CompileEnv *envPtr, ExtCmdLoc *mapPtr,
			    int eclIndex, int valueIndex,
			    Tcl_Token *valueTokenPtr, int numWords,
			    Tcl_Token **bodyToken, int *bodyLines,
			    int **bodyContLines);
static int		IssueTryFinallyInstructions(Tcl_Interp *interp,
			    CompileEnv *envPtr, Tcl_Token *bodyToken,
			    int numHandlers, int *matchCodes,
			    Tcl_Obj **matchClauses, int *resultVarIndices,
			    int *optionVarIndices, Tcl_Token **handlerTokens,
			    Tcl_Token *finallyToken);
static int		IssueTryInstructions(Tcl_Interp *interp,

 */

#define CompileWord(envPtr, tokenPtr, interp, word) \
    if ((tokenPtr)->type == TCL_TOKEN_SIMPLE_WORD) {			\
	TclEmitPush(TclRegisterNewLiteral((envPtr), (tokenPtr)[1].start, \
		(tokenPtr)[1].size), (envPtr));				\
    } else {								\
	envPtr->line = mapPtr->loc[eclIndex].line[word];		\
	envPtr->clNext = mapPtr->loc[eclIndex].next[word];		\
	TclCompileTokens((interp), (tokenPtr)+1, (tokenPtr)->numComponents, \
		(envPtr));						\
    }

/*
 * TIP #280: Remember the per-word line information of the current command. An
 * index is used instead of a pointer as recursive compilation may reallocate,
 * i.e. move, the array. This is also the reason to save the nuloc now, it may
 * change during the course of the function.
 *
 * Macro to encapsulate the variable definition and setup.
 */

#define DefineLineInformation \
    ExtCmdLoc *mapPtr = envPtr->extCmdMapPtr;				\
    int eclIndex = mapPtr->nuloc - 1

#define SetLineInformation(word) \
    envPtr->line = mapPtr->loc[eclIndex].line[(word)];			\
    envPtr->clNext = mapPtr->loc[eclIndex].next[(word)]

#define PushVarNameWord(i,v,e,f,l,s,sc,word) \
    PushVarName(i,v,e,f,l,s,sc,						\
	    mapPtr->loc[eclIndex].line[(word)],				\
	    mapPtr->loc[eclIndex].next[(word)])

/*
 * Flags bits used by PushVarName.
 */

#define TCL_NO_LARGE_INDEX 1	/* Do not return localIndex value > 255 */

/*

#define OP1(name,val)	TclEmitInstInt1(INST_##name,(val),envPtr)
#define OP4(name,val)	TclEmitInstInt4(INST_##name,(val),envPtr)
#define OP14(name,val1,val2) \
    TclEmitInstInt1(INST_##name,(val1),envPtr);TclEmitInt4((val2),envPtr)
#define OP44(name,val1,val2) \
    TclEmitInstInt4(INST_##name,(val1),envPtr);TclEmitInt4((val2),envPtr)
#define BODY(token,index) \
    SetLineInformation((index));CompileBody(envPtr,(token),interp)
#define PUSH(str) \
    PushLiteral(envPtr,(str),strlen(str))
#define JUMP(var,name) \
    (var) = CurrentOffset(envPtr);TclEmitInstInt4(INST_##name,0,envPtr)
#define FIXJUMP(var) \
    TclStoreInt4AtPtr(CurrentOffset(envPtr)-(var),envPtr->codeStart+(var)+1)
#define LOAD(idx) \

				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr, *valueTokenPtr;
    int isAssignment, isScalar, simpleVarName, localIndex, numWords;
    DefineLineInformation;	/* TIP #280 */

    numWords = parsePtr->numWords;
    if ((numWords != 2) && (numWords != 3)) {
	return TCL_ERROR;
    }
    isAssignment = (numWords == 3);

    /*
     * Decide if we can use a frame slot for the var/array name or if we need
     * to emit code to compute and push the name at runtime. We use a frame
     * slot (entry in the array of local vars) if we are compiling a procedure
     * body and if the name is simple text that does not include namespace
     * qualifiers.
     */

    varTokenPtr = TokenAfter(parsePtr->tokenPtr);
    PushVarNameWord(interp, varTokenPtr, envPtr, 0,
	    &localIndex, &simpleVarName, &isScalar, 1);

    /*
     * If we are doing an assignment, push the new value.
     */

    if (isAssignment) {
	valueTokenPtr = TokenAfter(varTokenPtr);

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;

    /*
     * We don't support any flags; the bytecode isn't that sophisticated.
     */

    if (parsePtr->numWords != 3) {

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;

    /*
     * We don't support any flags; the bytecode isn't that sophisticated.
     */

    if (parsePtr->numWords != 3) {

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;

    /*
     * We don't support any flags; the bytecode isn't that sophisticated.
     */

    if (parsePtr->numWords != 3) {

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;

    /*
     * We don't support any flags; the bytecode isn't that sophisticated.
     */

    if (parsePtr->numWords != 3) {

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;

    if (parsePtr->numWords != 3) {
	return TCL_ERROR;
    }

    /*

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;
    int i, length, exactMatch = 0, nocase = 0;
    const char *str;

    if (parsePtr->numWords < 3 || parsePtr->numWords > 4) {
	return TCL_ERROR;
    }

		Tcl_IncrRefCount(copy);
		exactMatch = TclMatchIsTrivial(TclGetString(copy));
		TclDecrRefCount(copy);
	    }
	    PushLiteral(envPtr, str, length);
	} else {
	    SetLineInformation(i+1+nocase);
	    CompileTokens(envPtr, tokenPtr, interp);
	}
	tokenPtr = TokenAfter(tokenPtr);
    }

    /*
     * Push the matcher.

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr;
    Tcl_Obj *objPtr;

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }

	char buf[TCL_INTEGER_SPACE];
	int len = Tcl_GetCharLength(objPtr);

	len = sprintf(buf, "%d", len);
	PushLiteral(envPtr, buf, len);
    } else {
	SetLineInformation(1);
	CompileTokens(envPtr, tokenPtr, interp);
	TclEmitOpcode(INST_STR_LEN, envPtr);
    }
    TclDecrRefCount(objPtr);
    return TCL_OK;
}

int
TclCompileStringMapCmd(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *mapTokenPtr, *stringTokenPtr;
    Tcl_Obj *mapObj, **objv;
    char *bytes;
    int len;

    /*
     * We only handle the case:

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *stringTokenPtr, *fromTokenPtr, *toTokenPtr;
    Tcl_Obj *tmpObj;
    int idx1, idx2, result;

    if (parsePtr->numWords != 4) {
	return TCL_ERROR;
    }

{
    int numArgs = parsePtr->numWords - 1;
    int numOpts = numArgs - 1;
    int objc, flags = TCL_SUBST_ALL;
    Tcl_Obj **objv/*, *toSubst = NULL*/;
    Tcl_Token *wordTokenPtr = TokenAfter(parsePtr->tokenPtr);
    int code = TCL_ERROR;
    DefineLineInformation;	/* TIP #280 */

    if (numArgs == 0) {
	return TCL_ERROR;
    }

    objv = TclStackAlloc(interp, /*numArgs*/ numOpts * sizeof(Tcl_Obj *));

	TclDecrRefCount(objv[objc]);
    }
    TclStackFree(interp, objv);
    if (/*toSubst == NULL*/ code != TCL_OK) {
	return TCL_ERROR;
    }

    SetLineInformation(numArgs);
    TclSubstCompile(interp, wordTokenPtr[1].start, wordTokenPtr[1].size,
	    flags, mapPtr->loc[eclIndex].line[numArgs], envPtr);

/*    TclDecrRefCount(toSubst);*/
    return TCL_OK;
}

void
TclSubstCompile(
    Tcl_Interp *interp,
    const char *bytes,
    int numBytes,
    int flags,
    int line,
    CompileEnv *envPtr)
{
    Tcl_Token *endTokenPtr, *tokenPtr;
    int breakOffset = 0, count = 0, bline = line;
    Tcl_Parse parse;
    Tcl_InterpState state = NULL;

    TclSubstParse(interp, bytes, numBytes, flags, &parse, &state);

    /*
     * Tricky point! If the first token does not result in a *guaranteed* push

	JumpFixup continueFixup, otherFixup, endFixup;

	switch (tokenPtr->type) {
	case TCL_TOKEN_TEXT:
	    literal = TclRegisterNewLiteral(envPtr,
		    tokenPtr->start, tokenPtr->size);
	    TclEmitPush(literal, envPtr);
	    TclAdvanceLines(&bline, tokenPtr->start,
		    tokenPtr->start + tokenPtr->size);
	    count++;
	    continue;
	case TCL_TOKEN_BS:
	    length = TclParseBackslash(tokenPtr->start, tokenPtr->size,
		    NULL, buf);
	    literal = TclRegisterNewLiteral(envPtr, buf, length);
	    TclEmitPush(literal, envPtr);

		    }
		}
		if (foundCommand) {
		    break;
		}
	    }

	    envPtr->line = bline;
	    TclCompileVarSubst(interp, tokenPtr, envPtr);
	    bline = envPtr->line;
	    count++;
	    continue;
	}

	while (count > 255) {
	    OP1(		CONCAT1, 255);
	    count -= 254;

	    /* Start */
	    if (TclFixupForwardJumpToHere(envPtr, &startFixup, 127)) {
		Tcl_Panic("TclCompileSubstCmd: bad start jump distance %d",
			(int) (CurrentOffset(envPtr) - startFixup.codeOffset));
	    }
	}

	envPtr->line = bline;
	catchRange = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE);
	OP4(	BEGIN_CATCH4, catchRange);
	ExceptionRangeStarts(envPtr, catchRange);

	switch (tokenPtr->type) {
	case TCL_TOKEN_COMMAND:
	    TclCompileScript(interp, tokenPtr->start+1, tokenPtr->size-2,

	}

	/* CONTINUE jump to here */
	if (TclFixupForwardJumpToHere(envPtr, &endFixup, 127)) {
	    Tcl_Panic("TclCompileSubstCmd: bad end jump distance %d",
		    (int) (CurrentOffset(envPtr) - endFixup.codeOffset));
	}
	bline = envPtr->line;
    }

    while (count > 255) {
	OP1(	CONCAT1, 255);
	count -= 254;
    }
    if (count > 1) {

    Tcl_Token *valueTokenPtr;	/* Token for the value to switch on. */
    enum {Switch_Exact, Switch_Glob, Switch_Regexp} mode;
				/* What kind of switch are we doing? */

    Tcl_Token *bodyTokenArray;	/* Array of real pattern list items. */
    Tcl_Token **bodyToken;	/* Array of pointers to pattern list items. */
    int *bodyLines;		/* Array of line numbers for body list
				 * items. */
    int **bodyContLines;	/* Array of continuation line info. */
    int noCase;			/* Has the -nocase flag been given? */
    int foundMode = 0;		/* Have we seen a mode flag yet? */
    int i, valueIndex;
    int result = TCL_ERROR;
    DefineLineInformation;	/* TIP #280 */
    int *clNext = envPtr->clNext;

    /*
     * Only handle the following versions:
     *   switch         ?--? word {pattern body ...}
     *   switch -exact  ?--? word {pattern body ...}
     *   switch -glob   ?--? word {pattern body ...}
     *   switch -regexp ?--? word {pattern body ...}

     * causes a crash during exception handling). When multiple tokens are
     * available at this point, this is pretty easy.
     */

    if (numWords == 1) {
	const char *bytes;
	int maxLen, numBytes;
	int bline;		/* TIP #280: line of the pattern/action list,
				 * and start of list for when tracking the
				 * location. This list comes immediately after
				 * the value we switch on. */

	if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
	    return TCL_ERROR;
	}
	bytes = tokenPtr[1].start;
	numBytes = tokenPtr[1].size;

	/* Allocate enough space to work in. */
	maxLen = TclMaxListLength(bytes, numBytes, NULL);
	if (maxLen < 2)  {
	    return TCL_ERROR;
	}
	bodyTokenArray = ckalloc(sizeof(Tcl_Token) * maxLen);
	bodyToken = ckalloc(sizeof(Tcl_Token *) * maxLen);
	bodyLines = ckalloc(sizeof(int) * maxLen);
	bodyContLines = ckalloc(sizeof(int*) * maxLen);

	bline = mapPtr->loc[eclIndex].line[valueIndex+1];
	numWords = 0;

	while (numBytes > 0) {
	    const char *prevBytes = bytes;
	    int literal;

	    if (TCL_OK != TclFindElement(NULL, bytes, numBytes,
		    &(bodyTokenArray[numWords].start), &bytes,
		    &(bodyTokenArray[numWords].size), &literal) || !literal) {
		goto abort;
	    }

	    bodyTokenArray[numWords].type = TCL_TOKEN_TEXT;
	    bodyTokenArray[numWords].numComponents = 0;
	    bodyToken[numWords] = bodyTokenArray + numWords;

	    /*
	     * TIP #280: Now determine the line the list element starts on
	     * (there is no need to do it earlier, due to the possibility of
	     * aborting, see above).
	     */

	    TclAdvanceLines(&bline, prevBytes, bodyTokenArray[numWords].start);
	    TclAdvanceContinuations(&bline, &clNext,
		    bodyTokenArray[numWords].start - envPtr->source);
	    bodyLines[numWords] = bline;
	    bodyContLines[numWords] = clNext;
	    TclAdvanceLines(&bline, bodyTokenArray[numWords].start, bytes);
	    TclAdvanceContinuations(&bline, &clNext, bytes - envPtr->source);

	    numBytes -= (bytes - prevBytes);
	    numWords++;
	}
	if (numWords % 2) {
	abort:
	    ckfree((char *) bodyToken);
	    ckfree((char *) bodyTokenArray);
	    ckfree((char *) bodyLines);
	    ckfree((char *) bodyContLines);
	    return TCL_ERROR;
	}
    } else if (numWords % 2 || numWords == 0) {
	/*
	 * Odd number of words (>1) available, or no words at all available.
	 * Both are error cases, so punt and let the interpreted-version
	 * generate the error message. Note that the second case probably
	 * should get caught earlier, but it's easy to check here again anyway
	 * because it'd cause a nasty crash otherwise.
	 */

	return TCL_ERROR;
    } else {
	/*
	 * Multi-word definition of patterns & actions.
	 */

	bodyToken = ckalloc(sizeof(Tcl_Token *) * numWords);
	bodyLines = ckalloc(sizeof(int) * numWords);
	bodyContLines = ckalloc(sizeof(int*) * numWords);
	bodyTokenArray = NULL;
	for (i=0 ; i<numWords ; i++) {
	    /*
	     * We only handle the very simplest case. Anything more complex is
	     * a good reason to go to the interpreted case anyway due to
	     * traces, etc.
	     */

	    if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
		goto freeTemporaries;
	    }
	    bodyToken[i] = tokenPtr+1;

	    /*
	     * TIP #280: Copy line information from regular cmd info.
	     */

	    bodyLines[i] = mapPtr->loc[eclIndex].line[valueIndex+1+i];
	    bodyContLines[i] = mapPtr->loc[eclIndex].next[valueIndex+1+i];
	    tokenPtr = TokenAfter(tokenPtr);
	}
    }

    /*
     * Fall back to interpreted if the last body is a continuation (it's
     * illegal, but this makes the error happen at the right time).

     * Check if we can generate a jump table, since if so that's faster than
     * doing an explicit compare with each body. Note that we're definitely
     * over-conservative with determining whether we can do the jump table,
     * but it handles the most common case well enough.
     */

    if (mode == Switch_Exact) {
	IssueSwitchJumpTable(interp, envPtr, mapPtr, eclIndex, valueIndex,
		valueTokenPtr, numWords, bodyToken, bodyLines, bodyContLines);
    } else {
	IssueSwitchChainedTests(interp, envPtr, mapPtr, eclIndex, mode,noCase,
		valueIndex, valueTokenPtr, numWords, bodyToken, bodyLines,
		bodyContLines);
    }
    result = TCL_OK;

    /*
     * Clean up all our temporary space and return.
     */

  freeTemporaries:
    ckfree(bodyToken);
    ckfree(bodyLines);
    ckfree(bodyContLines);
    if (bodyTokenArray != NULL) {
	ckfree(bodyTokenArray);
    }
    return result;
}

/*

 *----------------------------------------------------------------------
 */

static void
IssueSwitchChainedTests(
    Tcl_Interp *interp,		/* Context for compiling script bodies. */
    CompileEnv *envPtr,		/* Holds resulting instructions. */
    ExtCmdLoc *mapPtr,		/* For mapping tokens to their source code
				 * location. */
    int eclIndex,
    int mode,			/* Exact, Glob or Regexp */
    int noCase,			/* Case-insensitivity flag. */
    int valueIndex,		/* The value to match against. */
    Tcl_Token *valueTokenPtr,
    int numBodyTokens,		/* Number of tokens describing things the
				 * switch can match against and bodies to
				 * execute when the match succeeds. */
    Tcl_Token **bodyToken,	/* Array of pointers to pattern list items. */
    int *bodyLines,		/* Array of line numbers for body list
				 * items. */
    int **bodyContLines)	/* Array of continuation line info. */
{
    enum {Switch_Exact, Switch_Glob, Switch_Regexp};
    int savedStackDepth = envPtr->currStackDepth;
    int foundDefault;		/* Flag to indicate whether a "default" clause
				 * is present. */
    JumpFixup *fixupArray;	/* Array of forward-jump fixup records. */
    int *fixupTargetArray;	/* Array of places for fixups to point at. */

    int simple, exact;		/* For extracting the type of regexp. */
    int i;

    /*
     * First, we push the value we're matching against on the stack.
     */

    SetLineInformation(valueIndex);
    CompileTokens(envPtr, valueTokenPtr, interp);

    /*
     * Generate a test for each arm.
     */

    contFixIndex = -1;

	 * Now do the actual compilation. Note that we do not use CompileBody
	 * because we may have synthesized the tokens in a non-standard
	 * pattern.
	 */

	OP(	POP);
	envPtr->currStackDepth = savedStackDepth + 1;
	envPtr->line = bodyLines[i+1];		/* TIP #280 */
	envPtr->clNext = bodyContLines[i+1];	/* TIP #280 */
	TclCompileCmdWord(interp, bodyToken[i+1], 1, envPtr);

	if (!foundDefault) {
	    TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP,
		    &fixupArray[fixupCount]);
	    fixupCount++;
	    fixupTargetArray[nextArmFixupIndex] = CurrentOffset(envPtr);

 *----------------------------------------------------------------------
 */

static void
IssueSwitchJumpTable(
    Tcl_Interp *interp,		/* Context for compiling script bodies. */
    CompileEnv *envPtr,		/* Holds resulting instructions. */
    ExtCmdLoc *mapPtr,		/* For mapping tokens to their source code
				 * location. */
    int eclIndex,
    int valueIndex,		/* The value to match against. */
    Tcl_Token *valueTokenPtr,
    int numBodyTokens,		/* Number of tokens describing things the
				 * switch can match against and bodies to
				 * execute when the match succeeds. */
    Tcl_Token **bodyToken,	/* Array of pointers to pattern list items. */
    int *bodyLines,		/* Array of line numbers for body list
				 * items. */
    int **bodyContLines)	/* Array of continuation line info. */
{
    JumptableInfo *jtPtr;
    int savedStackDepth = envPtr->currStackDepth;
    int infoIndex, isNew, *finalFixups, numRealBodies = 0, jumpLocation;
    int mustGenerate, foundDefault, jumpToDefault, i;
    Tcl_DString buffer;
    Tcl_HashEntry *hPtr;

    /*
     * First, we push the value we're matching against on the stack.
     */

    SetLineInformation(valueIndex);
    CompileTokens(envPtr, valueTokenPtr, interp);

    /*
     * Compile the switch by using a jump table, which is basically a
     * hashtable that maps from literal values to match against to the offset
     * (relative to the INST_JUMP_TABLE instruction) to jump to. The jump
     * table itself is independent of any invokation of the bytecode, and as

	mustGenerate = 0;

	/*
	 * Compile the body of the arm.
	 */

	envPtr->currStackDepth = savedStackDepth;
	envPtr->line = bodyLines[i+1];		/* TIP #280 */
	envPtr->clNext = bodyContLines[i+1];	/* TIP #280 */
	TclCompileCmdWord(interp, bodyToken[i+1], 1, envPtr);

	/*
	 * Compile a jump in to the end of the command if this body is
	 * anything other than a user-supplied default arm (to either skip
	 * over the remaining bodies or the code that generates an empty
	 * result).

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    Tcl_Token *tokenPtr = parsePtr->tokenPtr;
    int i;

    if (parsePtr->numWords < 2 || parsePtr->numWords > 256
	    || envPtr->procPtr == NULL) {
	return TCL_ERROR;
    }

    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    DefineLineInformation;	/* TIP #280 */
    int numWords = parsePtr->numWords;
    int savedStackDepth = envPtr->currStackDepth;
    Tcl_Token *codeToken, *msgToken;
    Tcl_Obj *objPtr;

    if (numWords != 3) {
	return TCL_ERROR;

    bodyToken = TokenAfter(parsePtr->tokenPtr);

    if (numWords == 2) {
	/*
	 * No handlers or finally; do nothing beyond evaluating the body.
	 */

	DefineLineInformation;	/* TIP #280 */
	SetLineInformation(1);
	CompileBody(envPtr, bodyToken, interp);
	return TCL_OK;
    }

    numWords -= 2;
    tokenPtr = TokenAfter(bodyToken);

    int numHandlers,
    int *matchCodes,
    Tcl_Obj **matchClauses,
    int *resultVars,
    int *optionVars,
    Tcl_Token **handlerTokens)
{
    DefineLineInformation;	/* TIP #280 */
    int range, resultVar, optionsVar;
    int savedStackDepth = envPtr->currStackDepth;
    int i, j, len, forwardsNeedFixing = 0;
    int *addrsToFix, *forwardsToFix, notCodeJumpSource, notECJumpSource;
    char buf[TCL_INTEGER_SPACE];

    resultVar = TclFindCompiledLocal(NULL, 0, 1, envPtr);

    int *matchCodes,
    Tcl_Obj **matchClauses,
    int *resultVars,
    int *optionVars,
    Tcl_Token **handlerTokens,
    Tcl_Token *finallyToken)	/* Not NULL */
{
    DefineLineInformation;	/* TIP #280 */
    int savedStackDepth = envPtr->currStackDepth;
    int range, resultVar, optionsVar, i, j, len, forwardsNeedFixing = 0;
    int *addrsToFix, *forwardsToFix, notCodeJumpSource, notECJumpSource;
    char buf[TCL_INTEGER_SPACE];

    resultVar = TclFindCompiledLocal(NULL, 0, 1, envPtr);
    optionsVar = TclFindCompiledLocal(NULL, 0, 1, envPtr);

    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *varTokenPtr;
    int isScalar, simpleVarName, localIndex, numWords, flags, i;
    Tcl_Obj *leadingWord;
    DefineLineInformation;	/* TIP #280 */

    numWords = parsePtr->numWords-1;
    flags = 1;
    varTokenPtr = TokenAfter(parsePtr->tokenPtr);
    leadingWord = Tcl_NewObj();
    if (numWords > 0 && TclWordKnownAtCompileTime(varTokenPtr, leadingWord)) {
	int len;

	 * Decide if we can use a frame slot for the var/array name or if we
	 * need to emit code to compute and push the name at runtime. We use a
	 * frame slot (entry in the array of local vars) if we are compiling a
	 * procedure body and if the name is simple text that does not include
	 * namespace qualifiers.
	 */

	PushVarNameWord(interp, varTokenPtr, envPtr, 0,
		&localIndex, &simpleVarName, &isScalar, 1);

	/*
	 * Emit instructions to unset the variable.
	 */

	if (!simpleVarName) {
	    OP1(	UNSET_STK, flags);

    Tcl_Token *testTokenPtr, *bodyTokenPtr;
    JumpFixup jumpEvalCondFixup;
    int testCodeOffset, bodyCodeOffset, jumpDist, range, code, boolVal;
    int savedStackDepth = envPtr->currStackDepth;
    int loopMayEnd = 1;		/* This is set to 0 if it is recognized as an
				 * infinite loop. */
    Tcl_Obj *boolObj;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 3) {
	return TCL_ERROR;
    }

    /*
     * If the test expression requires substitutions, don't compile the while

	testCodeOffset = CurrentOffset(envPtr);
    }

    /*
     * Compile the loop body.
     */

    SetLineInformation(2);
    bodyCodeOffset = ExceptionRangeStarts(envPtr, range);
    CompileBody(envPtr, bodyTokenPtr, interp);
    ExceptionRangeEnds(envPtr, range);
    envPtr->currStackDepth = savedStackDepth + 1;
    OP(		POP);

    /*
     * Compile the test expression then emit the conditional jump that
     * terminates the while. We already know it's a simple word.
     */

    if (loopMayEnd) {
	testCodeOffset = CurrentOffset(envPtr);
	jumpDist = testCodeOffset - jumpEvalCondFixup.codeOffset;
	if (TclFixupForwardJump(envPtr, &jumpEvalCondFixup, jumpDist, 127)) {
	    bodyCodeOffset += 3;
	    testCodeOffset += 3;
	}
	envPtr->currStackDepth = savedStackDepth;
	SetLineInformation(1);
	TclCompileExprWords(interp, testTokenPtr, 1, envPtr);
	envPtr->currStackDepth = savedStackDepth + 1;

	jumpDist = CurrentOffset(envPtr) - bodyCodeOffset;
	if (jumpDist > 127) {
	    TclEmitInstInt4(INST_JUMP_TRUE4, -jumpDist, envPtr);
	} else {

    if (parsePtr->numWords < 1 || parsePtr->numWords > 2) {
	return TCL_ERROR;
    }

    if (parsePtr->numWords == 1) {
	PushLiteral(envPtr, "", 0);
    } else {
	DefineLineInformation;	/* TIP #280 */
	Tcl_Token *valueTokenPtr = TokenAfter(parsePtr->tokenPtr);

	CompileWord(envPtr, valueTokenPtr, interp, 1);
    }
    OP(		YIELD);
    return TCL_OK;
}

PushVarName(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Token *varTokenPtr,	/* Points to a variable token. */
    CompileEnv *envPtr,		/* Holds resulting instructions. */
    int flags,			/* TCL_NO_LARGE_INDEX. */
    int *localIndexPtr,		/* Must not be NULL. */
    int *simpleVarNamePtr,	/* Must not be NULL. */
    int *isScalarPtr,		/* Must not be NULL. */
    int line,			/* Line the token starts on. */
    int *clNext)		/* Reference to offset of next hidden cont.
				 * line. */
{
    register const char *p;
    const char *name, *elName;
    register int i, n;
    Tcl_Token *elemTokenPtr = NULL;
    int nameChars, elNameChars, simpleVarName, localIndex;
    int elemTokenCount = 0, allocedTokens = 0, removedParen = 0;

	/*
	 * Compile the element script, if any.
	 */

	if (elName != NULL) {
	    if (elNameChars) {
		envPtr->line = line;
		envPtr->clNext = clNext;
		TclCompileTokens(interp, elemTokenPtr, elemTokenCount,
			envPtr);
	    } else {
		PushLiteral(envPtr, "", 0);
	    }
	}
    } else {
	/*
	 * The var name isn't simple: compile and push it.
	 */

	envPtr->line = line;
	envPtr->clNext = clNext;
	CompileTokens(envPtr, varTokenPtr, interp);
    }

    if (removedParen) {
	varTokenPtr[removedParen].size++;
    }
    if (allocedTokens) {

CompileUnaryOpCmd(
    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    int instruction,
    CompileEnv *envPtr)
{
    Tcl_Token *tokenPtr;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }
    tokenPtr = TokenAfter(parsePtr->tokenPtr);
    CompileWord(envPtr, tokenPtr, interp, 1);
    TclEmitOpcode(instruction, envPtr);

    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    const char *identity,
    int instruction,
    CompileEnv *envPtr)
{
    Tcl_Token *tokenPtr = parsePtr->tokenPtr;
    DefineLineInformation;	/* TIP #280 */
    int words;

    for (words=1 ; words<parsePtr->numWords ; words++) {
	tokenPtr = TokenAfter(tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, words);
    }
    if (parsePtr->numWords <= 2) {

CompileComparisonOpCmd(
    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    int instruction,
    CompileEnv *envPtr)
{
    Tcl_Token *tokenPtr;
    DefineLineInformation;	/* TIP #280 */

    if (parsePtr->numWords < 3) {
	PushLiteral(envPtr, "1", 1);
    } else if (parsePtr->numWords == 3) {
	tokenPtr = TokenAfter(parsePtr->tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, 1);
	tokenPtr = TokenAfter(tokenPtr);

{
    /*
     * This one has its own implementation because the ** operator is the only
     * one with right associativity.
     */

    Tcl_Token *tokenPtr = parsePtr->tokenPtr;
    DefineLineInformation;	/* TIP #280 */
    int words;

    for (words=1 ; words<parsePtr->numWords ; words++) {
	tokenPtr = TokenAfter(tokenPtr);
	CompileWord(envPtr, tokenPtr, interp, words);
    }
    if (parsePtr->numWords <= 2) {

    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)
{
    Tcl_Token *tokenPtr = parsePtr->tokenPtr;
    DefineLineInformation;	/* TIP #280 */
    int words;

    if (parsePtr->numWords == 1) {
	/*
	 * Fallback to direct eval to report syntax error.
	 */

    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    Command *cmdPtr,		/* Points to defintion of command being
				 * compiled. */
    CompileEnv *envPtr)
{
    Tcl_Token *tokenPtr = parsePtr->tokenPtr;
    DefineLineInformation;	/* TIP #280 */
    int words;

    if (parsePtr->numWords == 1) {
	/*
	 * Fallback to direct eval to report syntax error.
	 */

	 * Valid parse; compile the tree.
	 */

	int objc;
	Tcl_Obj *const *litObjv;
	Tcl_Obj **funcObjv;

	/* TIP #280 : Track Lines within the expression */
	TclAdvanceLines(&envPtr->line, script,
		script + TclParseAllWhiteSpace(script, numBytes));

	TclListObjGetElements(NULL, litList, &objc, (Tcl_Obj ***)&litObjv);
	TclListObjGetElements(NULL, funcList, &objc, &funcObjv);
	CompileExprTree(interp, opTree, 0, &litObjv, funcObjv,
		parsePtr->tokenPtr, envPtr, optimize);
    } else {
	TclCompileSyntaxError(interp, envPtr);
    }

    /*
     * Note we are compiling an expression with literal arguments. This means
     * there can be no [info frame] calls when we execute the resulting
     * bytecode, so there's no need to tend to TIP 280 issues.
     */

    envPtr = TclStackAlloc(interp, sizeof(CompileEnv));
    TclInitCompileEnv(interp, envPtr, NULL, 0, NULL, 0);
    CompileExprTree(interp, nodes, index, litObjvPtr, NULL, NULL, envPtr,
	    0 /* optimize */);
    TclEmitOpcode(INST_DONE, envPtr);
    Tcl_IncrRefCount(byteCodeObj);
    TclInitByteCodeObj(byteCodeObj, envPtr);
    TclFreeCompileEnv(envPtr);
    TclStackFree(interp, envPtr);

static void		RegisterAuxDataType(const AuxDataType *typePtr);
static int		SetByteCodeFromAny(Tcl_Interp *interp,
			    Tcl_Obj *objPtr);
static int		FormatInstruction(ByteCode *codePtr,
			    const unsigned char *pc, Tcl_Obj *bufferObj);
static void		PrintSourceToObj(Tcl_Obj *appendObj,
			    const char *stringPtr, int maxChars);
static void		UpdateStringOfInstName(Tcl_Obj *objPtr);

/*
 * TIP #280: Helper for building the per-word line information of all compiled
 * commands.
 */
static void		EnterCmdWordData(ExtCmdLoc *eclPtr, int srcOffset,
			    Tcl_Token *tokenPtr, const char *cmd, int len,
			    int numWords, int line, int *clNext, int **lines,
			    CompileEnv *envPtr);
static void		ReleaseCmdWordData(ExtCmdLoc *eclPtr);

/*
 * The structure below defines the bytecode Tcl object type by means of
 * procedures that can be invoked by generic object code.
 */

const Tcl_ObjType tclByteCodeType = {

    "substcode",		/* name */
    FreeSubstCodeInternalRep,	/* freeIntRepProc */
    DupByteCodeInternalRep,	/* dupIntRepProc - shared with bytecode */
    NULL,			/* updateStringProc */
    NULL,			/* setFromAnyProc */
};

/*
 * The structure below defines an instruction name Tcl object to allow
 * reporting of inner contexts in errorstack without string allocation.
 */

static const Tcl_ObjType tclInstNameType = {
    "instname",			/* name */
    NULL,			/* freeIntRepProc */
    NULL,			/* dupIntRepProc */
    UpdateStringOfInstName,	/* updateStringProc */
    NULL,			/* setFromAnyProc */
};

/*
 *----------------------------------------------------------------------
 *
 * TclSetByteCodeFromAny --
 *
 *	Part of the bytecode Tcl object type implementation. Attempts to

TclSetByteCodeFromAny(
    Tcl_Interp *interp,		/* The interpreter for which the code is being
				 * compiled. Must not be NULL. */
    Tcl_Obj *objPtr,		/* The object to make a ByteCode object. */
    CompileHookProc *hookProc,	/* Procedure to invoke after compilation. */
    ClientData clientData)	/* Hook procedure private data. */
{
    Interp *iPtr = (Interp *) interp;
    CompileEnv compEnv;		/* Compilation environment structure allocated
				 * in frame. */
    int length, result = TCL_OK;
    const char *stringPtr;
    ContLineLoc *clLocPtr;

#ifdef TCL_COMPILE_DEBUG
    if (!traceInitialized) {
	if (Tcl_LinkVar(interp, "tcl_traceCompile",
		(char *) &tclTraceCompile, TCL_LINK_INT) != TCL_OK) {
	    Tcl_Panic("SetByteCodeFromAny: unable to create link for tcl_traceCompile variable");
	}
	traceInitialized = 1;
    }
#endif

    stringPtr = TclGetStringFromObj(objPtr, &length);

    /*
     * TIP #280: Pick up the CmdFrame in which the BC compiler was invoked and
     * use to initialize the tracking in the compiler. This information was
     * stored by TclCompEvalObj and ProcCompileProc.
     */

    TclInitCompileEnv(interp, &compEnv, stringPtr, length,
	    iPtr->invokeCmdFramePtr, iPtr->invokeWord);

    /*
     * Now we check if we have data about invisible continuation lines for the
     * script, and make it available to the compile environment, if so.
     *
     * It is not clear if the script Tcl_Obj* can be free'd while the compiler
     * is using it, leading to the release of the associated ContLineLoc
     * structure as well. To ensure that the latter doesn't happen we set a
     * lock on it. We release this lock in the function TclFreeCompileEnv(),
     * found in this file. The "lineCLPtr" hashtable is managed in the file
     * "tclObj.c".
     */

    clLocPtr = TclContinuationsGet(objPtr);
    if (clLocPtr) {
	compEnv.clLoc = clLocPtr;
	compEnv.clNext = &compEnv.clLoc->loc[0];
	Tcl_Preserve(compEnv.clLoc);
    }

    TclCompileScript(interp, stringPtr, length, &compEnv);

    /*
     * Successful compilation. Add a "done" instruction at the end.
     */

    TclEmitOpcode(INST_DONE, &compEnv);

 */

void
TclCleanupByteCode(
    register ByteCode *codePtr)	/* Points to the ByteCode to free. */
{
    Tcl_Interp *interp = (Tcl_Interp *) *codePtr->interpHandle;
    Interp *iPtr = (Interp *) interp;
    int numLitObjects = codePtr->numLitObjects;
    int numAuxDataItems = codePtr->numAuxDataItems;
    register Tcl_Obj **objArrayPtr, *objPtr;
    register const AuxData *auxDataPtr;
    int i;
#ifdef TCL_COMPILE_STATS

    if (interp != NULL) {
	ByteCodeStats *statsPtr;
	Tcl_Time destroyTime;
	int lifetimeSec, lifetimeMicroSec, log2;

	statsPtr = &iPtr->stats;

	statsPtr->numByteCodesFreed++;
	statsPtr->currentSrcBytes -= (double) codePtr->numSrcBytes;
	statsPtr->currentByteCodeBytes -= (double) codePtr->structureSize;

	statsPtr->currentInstBytes -= (double) codePtr->numCodeBytes;
	statsPtr->currentLitBytes -= (double)

    auxDataPtr = codePtr->auxDataArrayPtr;
    for (i = 0;  i < numAuxDataItems;  i++) {
	if (auxDataPtr->type->freeProc != NULL) {
	    auxDataPtr->type->freeProc(auxDataPtr->clientData);
	}
	auxDataPtr++;
    }

    /*
     * TIP #280. Release the location data associated with this byte code
     * structure, if any. NOTE: The interp we belong to may be gone already,
     * and the data with it.
     *
     * See also tclBasic.c, DeleteInterpProc
     */

    if (iPtr) {
	Tcl_HashEntry *hePtr = Tcl_FindHashEntry(iPtr->lineBCPtr,
		(char *) codePtr);

	if (hePtr) {
	    ReleaseCmdWordData(Tcl_GetHashValue(hePtr));
	    Tcl_DeleteHashEntry(hePtr);
	}
    }

    if (codePtr->localCachePtr && (--codePtr->localCachePtr->refCount == 0)) {
	TclFreeLocalCache(interp, codePtr->localCachePtr);
    }

    TclHandleRelease(codePtr->interpHandle);

	}
    }
    if (objPtr->typePtr != &substCodeType) {
	CompileEnv compEnv;
	int numBytes;
	const char *bytes = Tcl_GetStringFromObj(objPtr, &numBytes);

	/* TODO: Check for more TIP 280 */
	TclInitCompileEnv(interp, &compEnv, bytes, numBytes, NULL, 0);

	TclSubstCompile(interp, bytes, numBytes, flags, 1, &compEnv);

	TclEmitOpcode(INST_DONE, &compEnv);
	TclInitByteCodeObj(objPtr, &compEnv);
	objPtr->typePtr = &substCodeType;
	TclFreeCompileEnv(&compEnv);

	codePtr = objPtr->internalRep.twoPtrValue.ptr1;

    objPtr->typePtr = NULL;
    codePtr->refCount--;
    if (codePtr->refCount <= 0) {
	TclCleanupByteCode(codePtr);
    }
}

static void
ReleaseCmdWordData(
    ExtCmdLoc *eclPtr)
{
    int i;

    if (eclPtr->type == TCL_LOCATION_SOURCE) {
	Tcl_DecrRefCount(eclPtr->path);
    }
    for (i=0 ; i<eclPtr->nuloc ; i++) {
	ckfree((char *) eclPtr->loc[i].line);
    }

    if (eclPtr->loc != NULL) {
	ckfree((char *) eclPtr->loc);
    }

    Tcl_DeleteHashTable (&eclPtr->litInfo);

    ckfree((char *) eclPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclInitCompileEnv --
 *
 *	Initializes a CompileEnv compilation environment structure for the

void
TclInitCompileEnv(
    Tcl_Interp *interp,		/* The interpreter for which a CompileEnv
				 * structure is initialized. */
    register CompileEnv *envPtr,/* Points to the CompileEnv structure to
				 * initialize. */
    const char *stringPtr,	/* The source string to be compiled. */
    int numBytes,		/* Number of bytes in source string. */
    const CmdFrame *invoker,	/* Location context invoking the bcc */
    int word)			/* Index of the word in that context getting
				 * compiled */
{
    Interp *iPtr = (Interp *) interp;

    envPtr->iPtr = iPtr;
    envPtr->source = stringPtr;
    envPtr->numSrcBytes = numBytes;
    envPtr->procPtr = iPtr->compiledProcPtr;

    envPtr->mallocedExceptArray = 0;

    envPtr->cmdMapPtr = envPtr->staticCmdMapSpace;
    envPtr->cmdMapEnd = COMPILEENV_INIT_CMD_MAP_SIZE;
    envPtr->mallocedCmdMap = 0;
    envPtr->atCmdStart = 1;

    /*
     * TIP #280: Set up the extended command location information, based on
     * the context invoking the byte code compiler. This structure is used to
     * keep the per-word line information for all compiled commands.
     *
     * See also tclBasic.c, TclEvalObjEx, for the equivalent code in the
     * non-compiling evaluator
     */

    envPtr->extCmdMapPtr = ckalloc(sizeof(ExtCmdLoc));
    envPtr->extCmdMapPtr->loc = NULL;
    envPtr->extCmdMapPtr->nloc = 0;
    envPtr->extCmdMapPtr->nuloc = 0;
    envPtr->extCmdMapPtr->path = NULL;
    Tcl_InitHashTable(&envPtr->extCmdMapPtr->litInfo, TCL_ONE_WORD_KEYS);

    if ((invoker == NULL) || (invoker->type == TCL_LOCATION_EVAL_LIST)) {
	/*
	 * Initialize the compiler for relative counting in case of a
	 * dynamic context.
	 */

	envPtr->line = 1;
	if (iPtr->evalFlags & TCL_EVAL_FILE) {
	    iPtr->evalFlags &= ~TCL_EVAL_FILE;
	    envPtr->extCmdMapPtr->type = TCL_LOCATION_SOURCE;

	    if (iPtr->scriptFile) {
		/*
		 * Normalization here, to have the correct pwd. Should have
		 * negligible impact on performance, as the norm should have
		 * been done already by the 'source' invoking us, and it
		 * caches the result.
		 */

		Tcl_Obj *norm =
			Tcl_FSGetNormalizedPath(interp, iPtr->scriptFile);

		if (norm == NULL) {
		    /*
		     * Error message in the interp result. No place to put it.
		     * And no place to serve the error itself to either. Fake
		     * a path, empty string.
		     */

		    TclNewLiteralStringObj(envPtr->extCmdMapPtr->path, "");
		} else {
		    envPtr->extCmdMapPtr->path = norm;
		}
	    } else {
		TclNewLiteralStringObj(envPtr->extCmdMapPtr->path, "");
	    }

	    Tcl_IncrRefCount(envPtr->extCmdMapPtr->path);
	} else {
	    envPtr->extCmdMapPtr->type =
		(envPtr->procPtr ? TCL_LOCATION_PROC : TCL_LOCATION_BC);
	}
    } else {
	/*
	 * Initialize the compiler using the context, making counting absolute
	 * to that context. Note that the context can be byte code execution.
	 * In that case we have to fill out the missing pieces (line, path,
	 * ...) which may make change the type as well.
	 */

	CmdFrame *ctxPtr = TclStackAlloc(interp, sizeof(CmdFrame));
	int pc = 0;

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

	    TclGetSrcInfoForPc(ctxPtr);
	    pc = 1;
	}

	if ((ctxPtr->nline <= word) || (ctxPtr->line[word] < 0)) {
	    /*
	     * Word is not a literal, relative counting.
	     */

	    envPtr->line = 1;
	    envPtr->extCmdMapPtr->type =
		    (envPtr->procPtr ? TCL_LOCATION_PROC : TCL_LOCATION_BC);

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

		Tcl_DecrRefCount(ctxPtr->data.eval.path);
	    }
	} else {
	    envPtr->line = ctxPtr->line[word];
	    envPtr->extCmdMapPtr->type = ctxPtr->type;

	    if (ctxPtr->type == TCL_LOCATION_SOURCE) {
		envPtr->extCmdMapPtr->path = ctxPtr->data.eval.path;

		if (pc) {
		    /*
		     * The reference 'TclGetSrcInfoForPc' made is transfered.
		     */

		    ctxPtr->data.eval.path = NULL;
		} else {
		    /*
		     * We have a new reference here.
		     */

		    Tcl_IncrRefCount(envPtr->extCmdMapPtr->path);
		}
	    }
	}

	TclStackFree(interp, ctxPtr);
    }

    envPtr->extCmdMapPtr->start = envPtr->line;

    /*
     * Initialize the data about invisible continuation lines as empty, i.e.
     * not used. The caller (TclSetByteCodeFromAny) will set this up, if such
     * data is available.
     */

    envPtr->clLoc = NULL;
    envPtr->clNext = NULL;

    envPtr->auxDataArrayPtr = envPtr->staticAuxDataArraySpace;
    envPtr->auxDataArrayNext = 0;
    envPtr->auxDataArrayEnd = COMPILEENV_INIT_AUX_DATA_SIZE;
    envPtr->mallocedAuxDataArray = 0;
}


    }
    if (envPtr->mallocedCmdMap) {
	ckfree(envPtr->cmdMapPtr);
    }
    if (envPtr->mallocedAuxDataArray) {
	ckfree(envPtr->auxDataArrayPtr);
    }
    if (envPtr->extCmdMapPtr) {
	ReleaseCmdWordData(envPtr->extCmdMapPtr);
	envPtr->extCmdMapPtr = NULL;
    }

    /*
     * If we used data about invisible continuation lines, then now is the
     * time to release on our hold on it. The lock was set in function
     * TclSetByteCodeFromAny(), found in this file.
     */

    if (envPtr->clLoc) {
	Tcl_Release(envPtr->clLoc);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclWordKnownAtCompileTime --
 *

    unsigned char *entryCodeNext = envPtr->codeNext;
    const char *p, *next;
    Namespace *cmdNsPtr;
    Command *cmdPtr;
    Tcl_Token *tokenPtr;
    int bytesLeft, isFirstCmd, wordIdx, currCmdIndex, commandLength, objIndex;
    Tcl_DString ds;
    /* TIP #280 */
    ExtCmdLoc *eclPtr = envPtr->extCmdMapPtr;
    int *wlines, wlineat, cmdLine, *clNext;
    Tcl_Parse *parsePtr = TclStackAlloc(interp, sizeof(Tcl_Parse));

    if (envPtr->iPtr == NULL) {
	Tcl_Panic("TclCompileScript() called on uninitialized CompileEnv");
    }

    Tcl_DStringInit(&ds);

    /*
     * Each iteration through the following loop compiles the next command
     * from the script.
     */

    p = script;
    bytesLeft = numBytes;
    cmdLine = envPtr->line;
    clNext = envPtr->clNext;
    do {
	if (Tcl_ParseCommand(interp, p, bytesLeft, 0, parsePtr) != TCL_OK) {
	    /*
	     * Compile bytecodes to report the parse error at runtime.
	     */

	    Tcl_LogCommandInfo(interp, script, parsePtr->commandStart,
		    /* Drop the command terminator (";","]") if appropriate */
		    (parsePtr->term ==
		    parsePtr->commandStart + parsePtr->commandSize - 1)?
		    parsePtr->commandSize - 1 : parsePtr->commandSize);
	    TclCompileSyntaxError(interp, envPtr);
	    break;
	}

	/*
	 * TIP #280: We have to count newlines before the command even in the
	 * degenerate case when the command has no words. (See test
	 * info-30.33).
	 * So make that counting here, and not in the (numWords > 0) branch
	 * below.
	 */

	TclAdvanceLines(&cmdLine, p, parsePtr->commandStart);
	TclAdvanceContinuations(&cmdLine, &clNext,
		parsePtr->commandStart - envPtr->source);

	if (parsePtr->numWords > 0) {
	    int expand = 0;	/* Set if there are dynamic expansions to
				 * handle */

	    /*
	     * If not the first command, pop the previous command's result
	     * and, if we're compiling a top level command, update the last

	     * started" so that the command range is correct in the bytecode.
	     */

	    if (expand) {
		TclEmitOpcode(INST_EXPAND_START, envPtr);
	    }

	    /*
	     * TIP #280. Scan the words and compute the extended location
	     * information. The map first contain full per-word line
	     * information for use by the compiler. This is later replaced by
	     * a reduced form which signals non-literal words, stored in
	     * 'wlines'.
	     */

	    EnterCmdWordData(eclPtr, parsePtr->commandStart - envPtr->source,
		    parsePtr->tokenPtr, parsePtr->commandStart,
		    parsePtr->commandSize, parsePtr->numWords, cmdLine,
		    clNext, &wlines, envPtr);
	    wlineat = eclPtr->nuloc - 1;

	    /*
	     * Each iteration of the following loop compiles one word from the
	     * command.
	     */

	    for (wordIdx = 0, tokenPtr = parsePtr->tokenPtr;
		    wordIdx < parsePtr->numWords; wordIdx++,
		    tokenPtr += tokenPtr->numComponents + 1) {

		envPtr->line = eclPtr->loc[wlineat].line[wordIdx];
		envPtr->clNext = eclPtr->loc[wlineat].next[wordIdx];
		if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
		    /*
		     * The word is not a simple string of characters.
		     */

		    TclCompileTokens(interp, tokenPtr+1,
			    tokenPtr->numComponents, envPtr);

		     * uplevel, etc. commands, should they encounter it
		     * unmodified. We care only if the we are in a context
		     * which already allows absolute counting.
		     */

		    objIndex = TclRegisterNewLiteral(envPtr,
			    tokenPtr[1].start, tokenPtr[1].size);

		    if (envPtr->clNext) {
			TclContinuationsEnterDerived(
				TclFetchLiteral(envPtr, objIndex),
				tokenPtr[1].start - envPtr->source,
				eclPtr->loc[wlineat].next[wordIdx]);
		    }
		}
		TclEmitPush(objIndex, envPtr);
	    } /* for loop */

	    /*
	     * Emit an invoke instruction for the command. We skip this if a
	     * compile procedure was found for the command.

		 * is being prepared and run, INST_EXPAND_STKTOP is not
		 * stack-neutral in general.
		 */

		TclEmitOpcode(INST_INVOKE_EXPANDED, envPtr);
		TclAdjustStackDepth((1-wordIdx), envPtr);
	    } else if (wordIdx > 0) {
		/*
		 * Save PC -> command map for the TclArgumentBC* functions.
		 */

		int isnew;
		Tcl_HashEntry *hePtr = Tcl_CreateHashEntry(&eclPtr->litInfo,
			INT2PTR(envPtr->codeNext - envPtr->codeStart),
			&isnew);

		Tcl_SetHashValue(hePtr, INT2PTR(wlineat));
		if (wordIdx <= 255) {
		    TclEmitInstInt1(INST_INVOKE_STK1, wordIdx, envPtr);
		} else {
		    TclEmitInstInt4(INST_INVOKE_STK4, wordIdx, envPtr);
		}
	    }

	    /*
	     * Update the compilation environment structure and record the
	     * offsets of the source and code for the command.
	     */

	finishCommand:
	    EnterCmdExtentData(envPtr, currCmdIndex, commandLength,
		    (envPtr->codeNext-envPtr->codeStart) - startCodeOffset);
	    isFirstCmd = 0;

	    /*
	     * TIP #280: Free full form of per-word line data and insert the
	     * reduced form now
	     */

	    ckfree(eclPtr->loc[wlineat].line);
	    ckfree(eclPtr->loc[wlineat].next);
	    eclPtr->loc[wlineat].line = wlines;
	    eclPtr->loc[wlineat].next = NULL;
	} /* end if parsePtr->numWords > 0 */

	/*
	 * Advance to the next command in the script.
	 */

	next = parsePtr->commandStart + parsePtr->commandSize;
	bytesLeft -= next - p;
	p = next;

	/*
	 * TIP #280: Track lines in the just compiled command.
	 */

	TclAdvanceLines(&cmdLine, parsePtr->commandStart, p);
	TclAdvanceContinuations(&cmdLine, &clNext, p - envPtr->source);
	Tcl_FreeParse(parsePtr);
    } while (bytesLeft > 0);

    /*
     * TIP #280: Bring the line counts in the CompEnv up to date.
     *	See tests info-30.33,34,35 .
     */

    envPtr->line = cmdLine;
    envPtr->clNext = clNext;

    /*
     * If the source script yielded no instructions (e.g., if it was empty),
     * push an empty string as the command's result.
     */

    if (envPtr->codeNext == entryCodeNext) {
	TclEmitPush(TclRegisterNewLiteral(envPtr, "", 0), envPtr);

	TclEmitPush(TclRegisterNewLiteral(envPtr, name, nameBytes), envPtr);
    }

    /*
     * Emit instructions to load the variable.
     */

    TclAdvanceLines(&envPtr->line, tokenPtr[1].start,
	    tokenPtr[1].start + tokenPtr[1].size);

    if (tokenPtr->numComponents == 1) {
	if (localVar < 0) {
	    TclEmitOpcode(INST_LOAD_SCALAR_STK, envPtr);
	} else if (localVar <= 255) {
	    TclEmitInstInt1(INST_LOAD_SCALAR1, localVar, envPtr);
	} else {
	    TclEmitInstInt4(INST_LOAD_SCALAR4, localVar, envPtr);

    int count,			/* Number of tokens to consider at tokenPtr.
				 * Must be at least 1. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_DString textBuffer;	/* Holds concatenated chars from adjacent
				 * TCL_TOKEN_TEXT, TCL_TOKEN_BS tokens. */
    char buffer[TCL_UTF_MAX];
    int i, numObjsToConcat, length;
    unsigned char *entryCodeNext = envPtr->codeNext;
#define NUM_STATIC_POS 20
    int isLiteral, maxNumCL, numCL;
    int *clPosition = NULL;

    /*
     * For the handling of continuation lines in literals we first check if
     * this is actually a literal. For if not we can forego the additional
     * processing. Otherwise we pre-allocate a small table to store the
     * locations of all continuation lines we find in this literal, if any.
     * The table is extended if needed.
     *
     * Note: Different to the equivalent code in function 'TclSubstTokens()'
     * (see file "tclParse.c") we do not seem to need the 'adjust' variable.
     * We also do not seem to need code which merges continuation line
     * information of multiple words which concat'd at runtime. Either that or
     * I have not managed to find a test case for these two possibilities yet.
     * It might be a difference between compile- versus run-time processing.
     */

    numCL = 0;
    maxNumCL = 0;
    isLiteral = 1;
    for (i=0 ; i < count; i++) {
	if ((tokenPtr[i].type != TCL_TOKEN_TEXT)
		&& (tokenPtr[i].type != TCL_TOKEN_BS)) {
	    isLiteral = 0;
	    break;
	}
    }

    if (isLiteral) {
	maxNumCL = NUM_STATIC_POS;
	clPosition = ckalloc(maxNumCL * sizeof(int));
    }

    Tcl_DStringInit(&textBuffer);
    numObjsToConcat = 0;
    for ( ;  count > 0;  count--, tokenPtr++) {
	switch (tokenPtr->type) {
	case TCL_TOKEN_TEXT:
	    TclDStringAppendToken(&textBuffer, tokenPtr);
	    TclAdvanceLines(&envPtr->line, tokenPtr->start,
		    tokenPtr->start + tokenPtr->size);
	    break;

	case TCL_TOKEN_BS:
	    length = TclParseBackslash(tokenPtr->start, tokenPtr->size,
		    NULL, buffer);
	    Tcl_DStringAppend(&textBuffer, buffer, length);

	    /*
	     * If the backslash sequence we found is in a literal, and
	     * represented a continuation line, we compute and store its
	     * location (as char offset to the beginning of the _result_
	     * script). We may have to extend the table of locations.
	     *
	     * Note that the continuation line information is relevant even if
	     * the word we are processing is not a literal, as it can affect
	     * nested commands. See the branch for TCL_TOKEN_COMMAND below,
	     * where the adjustment we are tracking here is taken into
	     * account. The good thing is that we do not need a table of
	     * everything, just the number of lines we have to add as
	     * correction.
	     */

	    if ((length == 1) && (buffer[0] == ' ') &&
		(tokenPtr->start[1] == '\n')) {
		if (isLiteral) {
		    int clPos = Tcl_DStringLength(&textBuffer);

		    if (numCL >= maxNumCL) {
			maxNumCL *= 2;
			clPosition = ckrealloc(clPosition,
                                maxNumCL * sizeof(int));
		    }
		    clPosition[numCL] = clPos;
		    numCL ++;
		}
	    }
	    break;

	case TCL_TOKEN_COMMAND:
	    /*
	     * Push any accumulated chars appearing before the command.
	     */

	    if (Tcl_DStringLength(&textBuffer) > 0) {
		int literal = TclRegisterDStringLiteral(envPtr, &textBuffer);

		TclEmitPush(literal, envPtr);
		numObjsToConcat++;
		Tcl_DStringFree(&textBuffer);

		if (numCL) {
		    TclContinuationsEnter(TclFetchLiteral(envPtr, literal),
			    numCL, clPosition);
		}
		numCL = 0;
	    }

	    TclCompileScript(interp, tokenPtr->start+1,
		    tokenPtr->size-2, envPtr);
	    numObjsToConcat++;
	    break;

     */

    if (Tcl_DStringLength(&textBuffer) > 0) {
	int literal = TclRegisterDStringLiteral(envPtr, &textBuffer);

	TclEmitPush(literal, envPtr);
	numObjsToConcat++;
	if (numCL) {
	    TclContinuationsEnter(TclFetchLiteral(envPtr, literal),
		    numCL, clPosition);
	}
	numCL = 0;
    }

    /*
     * If necessary, concatenate the parts of the word.
     */

    while (numObjsToConcat > 255) {

     * If the tokens yielded no instructions, push an empty string.
     */

    if (envPtr->codeNext == entryCodeNext) {
	TclEmitPush(TclRegisterNewLiteral(envPtr, "", 0), envPtr);
    }
    Tcl_DStringFree(&textBuffer);

    /*
     * Release the temp table we used to collect the locations of continuation
     * lines, if any.
     */

    if (maxNumCL) {
	ckfree(clPosition);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileCmdWord --
 *

    size_t auxDataArrayBytes, structureSize;
    register unsigned char *p;
#ifdef TCL_COMPILE_DEBUG
    unsigned char *nextPtr;
#endif
    int numLitObjects = envPtr->literalArrayNext;
    Namespace *namespacePtr;
    int i, isNew;
    Interp *iPtr;

    if (envPtr->iPtr == NULL) {
	Tcl_Panic("TclInitByteCodeObj() called on uninitialized CompileEnv");
    }

    iPtr = envPtr->iPtr;

     * by making its internal rep point to the just compiled ByteCode.
     */

    TclFreeIntRep(objPtr);
    objPtr->internalRep.twoPtrValue.ptr1 = codePtr;
    objPtr->typePtr = &tclByteCodeType;

    /*
     * TIP #280. Associate the extended per-word line information with the
     * byte code object (internal rep), for use with the bc compiler.
     */

    Tcl_SetHashValue(Tcl_CreateHashEntry(iPtr->lineBCPtr, codePtr,
	    &isNew), envPtr->extCmdMapPtr);
    envPtr->extCmdMapPtr = NULL;

    /* We've used up the CompileEnv.  Mark as uninitialized. */
    envPtr->iPtr = NULL;

    codePtr->localCachePtr = NULL;
}

/*

		cmdIndex);
    }

    cmdLocPtr = &envPtr->cmdMapPtr[cmdIndex];
    cmdLocPtr->numSrcBytes = numSrcBytes;
    cmdLocPtr->numCodeBytes = numCodeBytes;
}

/*
 *----------------------------------------------------------------------
 * TIP #280
 *
 * EnterCmdWordData --
 *
 *	Registers the lines for the words of a command. This information is
 *	used at runtime by 'info frame'.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Inserts word location information into the compilation environment
 *	envPtr for the command at index cmdIndex. The compilation
 *	environment's ExtCmdLoc.ECL array is grown if necessary.
 *
 *----------------------------------------------------------------------
 */

static void
EnterCmdWordData(
    ExtCmdLoc *eclPtr,		/* Points to the map environment structure in
				 * which to enter command location
				 * information. */
    int srcOffset,		/* Offset of first char of the command. */
    Tcl_Token *tokenPtr,
    const char *cmd,
    int len,
    int numWords,
    int line,
    int *clNext,
    int **wlines,
    CompileEnv *envPtr)
{
    ECL *ePtr;
    const char *last;
    int wordIdx, wordLine, *wwlines, *wordNext;

    if (eclPtr->nuloc >= eclPtr->nloc) {
	/*
	 * Expand the ECL array by allocating more storage from the heap. The
	 * currently allocated ECL entries are stored from eclPtr->loc[0] up
	 * to eclPtr->loc[eclPtr->nuloc-1] (inclusive).
	 */

	size_t currElems = eclPtr->nloc;
	size_t newElems = (currElems ? 2*currElems : 1);
	size_t newBytes = newElems * sizeof(ECL);

	eclPtr->loc = ckrealloc(eclPtr->loc, newBytes);
	eclPtr->nloc = newElems;
    }

    ePtr = &eclPtr->loc[eclPtr->nuloc];
    ePtr->srcOffset = srcOffset;
    ePtr->line = ckalloc(numWords * sizeof(int));
    ePtr->next = ckalloc(numWords * sizeof(int *));
    ePtr->nline = numWords;
    wwlines = ckalloc(numWords * sizeof(int));

    last = cmd;
    wordLine = line;
    wordNext = clNext;
    for (wordIdx=0 ; wordIdx<numWords;
	    wordIdx++, tokenPtr += tokenPtr->numComponents + 1) {
	TclAdvanceLines(&wordLine, last, tokenPtr->start);
	TclAdvanceContinuations(&wordLine, &wordNext,
		tokenPtr->start - envPtr->source);
	wwlines[wordIdx] =
		(TclWordKnownAtCompileTime(tokenPtr, NULL) ? wordLine : -1);
	ePtr->line[wordIdx] = wordLine;
	ePtr->next[wordIdx] = wordNext;
	last = tokenPtr->start;
    }

    *wlines = wwlines;
    eclPtr->nuloc ++;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCreateExceptRange --
 *
 *	Procedure that allocates and initializes a new ExceptionRange

	    rangePtr->catchOffset += 3;
	    break;
	default:
	    Tcl_Panic("TclFixupForwardJump: bad ExceptionRange type %d",
		    rangePtr->type);
	}
    }

    /*
     * TIP #280: Adjust the mapping from PC values to the per-command
     * information about arguments and their line numbers.
     *
     * Note: We cannot simply remove an out-of-date entry and then reinsert
     * with the proper PC, because then we might overwrite another entry which
     * was at that location. Therefore we pull (copy + delete) all effected
     * entries (beyond the fixed PC) into an array, update them there, and at
     * last reinsert them all.
     */

    {
	ExtCmdLoc* eclPtr = envPtr->extCmdMapPtr;

	/* A helper structure */

	typedef struct {
	    int pc;
	    int cmd;
	} MAP;

	/*
	 * And the helper array. At most the whole hashtable is placed into
	 * this.
	 */

	MAP *map = (MAP*) ckalloc (sizeof(MAP) * eclPtr->litInfo.numEntries);

	Tcl_HashSearch hSearch;
	Tcl_HashEntry* hPtr;
	int n, k, isnew;

	/*
	 * Phase I: Locate the affected entries, and save them in adjusted
	 * form to the array. This removes them from the hash.
	 */

	for (n = 0, hPtr = Tcl_FirstHashEntry(&eclPtr->litInfo, &hSearch);
	     hPtr != NULL;
	     hPtr = Tcl_NextHashEntry(&hSearch)) {

	    map [n].cmd = PTR2INT(Tcl_GetHashValue(hPtr));
	    map [n].pc  = PTR2INT(Tcl_GetHashKey (&eclPtr->litInfo,hPtr));

	    if (map[n].pc >= (jumpFixupPtr->codeOffset + 2)) {
		Tcl_DeleteHashEntry(hPtr);
		map [n].pc += 3;
		n++;
	    }
	}

	/*
	 * Phase II: Re-insert the modified entries into the hash.
	 */

	for (k=0;k<n;k++) {
	    hPtr = Tcl_CreateHashEntry(&eclPtr->litInfo, INT2PTR(map[k].pc), &isnew);
	    Tcl_SetHashValue(hPtr, INT2PTR(map[k].cmd));
	}

	ckfree (map);
    }

    return 1;			/* the jump was grown */
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetInstructionTable --

	Tcl_AppendToObj(bufferObj, "\t\t[", -1);
	auxPtr->type->printProc(auxPtr->clientData, bufferObj, codePtr,
		pcOffset);
	Tcl_AppendToObj(bufferObj, "]\n", -1);
    }
    return numBytes;
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetInnerContext --
 *
 *	If possible, returns a list capturing the inner context. Otherwise
 *	return NULL.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclGetInnerContext(
    Tcl_Interp *interp,
    const unsigned char *pc,
    Tcl_Obj **tosPtr)
{
    int objc = 0, off = 0;
    Tcl_Obj *result;
    Interp *iPtr = (Interp *) interp;

    switch (*pc) {
    case INST_STR_LEN:
    case INST_LNOT:
    case INST_BITNOT:
    case INST_UMINUS:
    case INST_UPLUS:
    case INST_TRY_CVT_TO_NUMERIC:
    case INST_EXPAND_STKTOP:
    case INST_EXPR_STK:
        objc = 1;
        break;

    case INST_LIST_IN:
    case INST_LIST_NOT_IN:	/* Basic list containment operators. */
    case INST_STR_EQ:
    case INST_STR_NEQ:		/* String (in)equality check */
    case INST_STR_CMP:		/* String compare. */
    case INST_STR_INDEX:
    case INST_STR_MATCH:
    case INST_REGEXP:
    case INST_EQ:
    case INST_NEQ:
    case INST_LT:
    case INST_GT:
    case INST_LE:
    case INST_GE:
    case INST_MOD:
    case INST_LSHIFT:
    case INST_RSHIFT:
    case INST_BITOR:
    case INST_BITXOR:
    case INST_BITAND:
    case INST_EXPON:
    case INST_ADD:
    case INST_SUB:
    case INST_DIV:
    case INST_MULT:
        objc = 2;
        break;

    case INST_RETURN_STK:
        /* early pop. TODO: dig out opt dict too :/ */
        objc = 1;
        break;

    case INST_SYNTAX:
    case INST_RETURN_IMM:
        objc = 2;
        break;

    case INST_INVOKE_STK4:
	objc = TclGetUInt4AtPtr(pc+1);
        break;

    case INST_INVOKE_STK1:
	objc = TclGetUInt1AtPtr(pc+1);
	break;
    }

    result = iPtr->innerContext;
    if (Tcl_IsShared(result)) {
        Tcl_DecrRefCount(result);
        iPtr->innerContext = result = Tcl_NewListObj(objc + 1, NULL);
        Tcl_IncrRefCount(result);
    } else {
        int len;

        /*
         * Reset while keeping the list intrep as much as possible.
         */

	Tcl_ListObjLength(interp, result, &len);
        Tcl_ListObjReplace(interp, result, 0, len, 0, NULL);
    }
    Tcl_ListObjAppendElement(NULL, result, TclNewInstNameObj(*pc));

    for (; objc>0 ; objc--) {
        Tcl_Obj *objPtr;

        objPtr = tosPtr[1 - objc + off];
        if (!objPtr) {
            Tcl_Panic("InnerContext: bad tos -- appending null object");
        }
        if ((objPtr->refCount<=0)
#ifdef TCL_MEM_DEBUG
                || (objPtr->refCount==0x61616161)
#endif
        ) {
            Tcl_Panic("InnerContext: bad tos -- appending freed object %p",
                    objPtr);
        }
        Tcl_ListObjAppendElement(NULL, result, objPtr);
    }

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclNewInstNameObj --
 *
 *	Creates a new InstName Tcl_Obj based on the given instruction
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclNewInstNameObj(
    unsigned char inst)
{
    Tcl_Obj *objPtr = Tcl_NewObj();

    objPtr->typePtr = &tclInstNameType;
    objPtr->internalRep.longValue = (long) inst;
    objPtr->bytes = NULL;

    return objPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfInstName --
 *
 *	Update the string representation for an instruction name object.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfInstName(
    Tcl_Obj *objPtr)
{
    int inst = objPtr->internalRep.longValue;
    char *s, buf[20];
    int len;

    if ((inst < 0) || (inst > LAST_INST_OPCODE)) {
        sprintf(buf, "inst_%d", inst);
        s = buf;
    } else {
        s = (char *) tclInstructionTable[objPtr->internalRep.longValue].name;
    }
    len = strlen(s);
    objPtr->bytes = ckalloc(len + 1);
    memcpy(objPtr->bytes, s, len + 1);
    objPtr->length = len;
}

/*
 *----------------------------------------------------------------------
 *
 * PrintSourceToObj --
 *
 *	Appends a quoted representation of a string to a Tcl_Obj.

typedef struct CmdLocation {
    int codeOffset;		/* Offset of first byte of command code. */
    int numCodeBytes;		/* Number of bytes for command's code. */
    int srcOffset;		/* Offset of first char of the command. */
    int numSrcBytes;		/* Number of command source chars. */
} CmdLocation;

/*
 * TIP #280
 * Structure to record additional location information for byte code. This
 * information is internal and not saved. i.e. tbcload'ed code will not have
 * this information. It records the lines for all words of all commands found
 * in the byte code. The association with a ByteCode structure BC is done
 * through the 'lineBCPtr' HashTable in Interp, keyed by the address of BC.
 * Also recorded is information coming from the context, i.e. type of the
 * frame and associated information, like the path of a sourced file.
 */

typedef struct ECL {
    int srcOffset;		/* Command location to find the entry. */
    int nline;			/* Number of words in the command */
    int *line;			/* Line information for all words in the
				 * command. */
    int **next;			/* Transient information used by the compiler
				 * for tracking of hidden continuation
				 * lines. */
} ECL;

typedef struct ExtCmdLoc {
    int type;			/* Context type. */
    int start;			/* Starting line for compiled script. Needed
				 * for the extended recompile check in
				 * tclCompileObj. */
    Tcl_Obj *path;		/* Path of the sourced file the command is
				 * in. */
    ECL *loc;			/* Command word locations (lines). */
    int nloc;			/* Number of allocated entries in 'loc'. */
    int nuloc;			/* Number of used entries in 'loc'. */
    Tcl_HashTable litInfo;	/* Indexed by bytecode 'PC', to have the
				 * information accessible per command and
				 * argument, not per whole bytecode. Value is
				 * index of command in 'loc', giving us the
				 * literals to associate with line information
				 * as command argument, see
				 * TclArgumentBCEnter() */
} ExtCmdLoc;

/*
 * CompileProcs need the ability to record information during compilation that
 * can be used by bytecode instructions during execution. The AuxData
 * structure provides this "auxiliary data" mechanism. An arbitrary number of
 * these structures can be stored in the ByteCode record (during compilation
 * they are stored in a CompileEnv structure). Each AuxData record holds one
 * word of client-specified data (often a pointer) and is given an index that

				/* Initial storage of LiteralEntry array. */
    ExceptionRange staticExceptArraySpace[COMPILEENV_INIT_EXCEPT_RANGES];
				/* Initial ExceptionRange array storage. */
    CmdLocation staticCmdMapSpace[COMPILEENV_INIT_CMD_MAP_SIZE];
				/* Initial storage for cmd location map. */
    AuxData staticAuxDataArraySpace[COMPILEENV_INIT_AUX_DATA_SIZE];
				/* Initial storage for aux data array. */
    /* TIP #280 */
    ExtCmdLoc *extCmdMapPtr;	/* Extended command location information for
				 * 'info frame'. */
    int line;			/* First line of the script, based on the
				 * invoking context, then the line of the
				 * command currently compiled. */
    int atCmdStart;		/* Flag to say whether an INST_START_CMD
				 * should be issued; they should never be
				 * issued repeatedly, as that is significantly
				 * inefficient. */
    ContLineLoc *clLoc;		/* If not NULL, the table holding the
				 * locations of the invisible continuation
				 * lines in the input script, to adjust the
				 * line counter. */
    int *clNext;		/* If not NULL, it refers to the next slot in
				 * clLoc to check for an invisible
				 * continuation line. */
} CompileEnv;

/*
 * The structure defining the bytecode instructions resulting from compiling a
 * Tcl script. Note that this structure is variable length: a single heap
 * object is allocated to hold the ByteCode structure immediately followed by
 * the code bytes, the literal object array, the ExceptionRange array, the

/*
 *----------------------------------------------------------------
 * Procedures exported by the engine to be used by tclBasic.c
 *----------------------------------------------------------------
 */

MODULE_SCOPE ByteCode *	TclCompileObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
			    const CmdFrame *invoker, int word);

/*
 *----------------------------------------------------------------
 * Procedures shared among Tcl bytecode compilation and execution modules but
 * not used outside:
 *----------------------------------------------------------------
 */

MODULE_SCOPE void	TclFreeCompileEnv(CompileEnv *envPtr);
MODULE_SCOPE void	TclFreeJumpFixupArray(JumpFixupArray *fixupArrayPtr);
MODULE_SCOPE void	TclInitAuxDataTypeTable(void);
MODULE_SCOPE void	TclInitByteCodeObj(Tcl_Obj *objPtr,
			    CompileEnv *envPtr);
MODULE_SCOPE void	TclInitCompileEnv(Tcl_Interp *interp,
			    CompileEnv *envPtr, const char *string,
			    int numBytes, const CmdFrame *invoker, int word);
MODULE_SCOPE void	TclInitJumpFixupArray(JumpFixupArray *fixupArrayPtr);
MODULE_SCOPE void	TclInitLiteralTable(LiteralTable *tablePtr);
#ifdef TCL_COMPILE_STATS
MODULE_SCOPE char *	TclLiteralStats(LiteralTable *tablePtr);
MODULE_SCOPE int	TclLog2(int value);
#endif
#ifdef TCL_COMPILE_DEBUG

			    Tcl_Obj *const objv[]);
#ifdef TCL_COMPILE_DEBUG
MODULE_SCOPE void	TclVerifyGlobalLiteralTable(Interp *iPtr);
MODULE_SCOPE void	TclVerifyLocalLiteralTable(CompileEnv *envPtr);
#endif
MODULE_SCOPE int	TclWordKnownAtCompileTime(Tcl_Token *tokenPtr,
			    Tcl_Obj *valuePtr);
MODULE_SCOPE void	TclLogCommandInfo(Tcl_Interp *interp,
					  const char *script,
					  const char *command, int length,
					  const unsigned char *pc, Tcl_Obj **tosPtr); 
MODULE_SCOPE Tcl_Obj	*TclGetInnerContext(Tcl_Interp *interp,
					    const unsigned char *pc, Tcl_Obj **tosPtr);
MODULE_SCOPE Tcl_Obj	*TclNewInstNameObj(unsigned char inst);


/*
 *----------------------------------------------------------------
 * Macros and flag values used by Tcl bytecode compilation and execution
 * modules inside the Tcl core but not used outside.
 *----------------------------------------------------------------
 */