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/*
 * tclExecute.c --
 *
 *  This file contains procedures that execute byte-compiled Tcl
 *  commands.
 *
 * Copyright (c) 1996-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 by Scriptics Corporation.
 * Copyright (c) 2001 by Kevin B. Kenny.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclExecute.c,v 1.94.2.18 2005/12/12 11:28:22 rmax Exp $
 */
 
#include "tclInt.h"
#include "tclCompile.h"
 
#ifndef TCL_NO_MATH
#   include "tclMath.h"
#endif
 
/*
 * The stuff below is a bit of a hack so that this file can be used
 * in environments that include no UNIX, i.e. no errno.  Just define
 * errno here.
 */
 
#ifndef TCL_GENERIC_ONLY
#   include "tclPort.h"
#else /* TCL_GENERIC_ONLY */
#   ifndef NO_FLOAT_H
# include <float.h>
#   else /* NO_FLOAT_H */
# ifndef NO_VALUES_H
#     include <values.h>
# endif /* !NO_VALUES_H */
#   endif /* !NO_FLOAT_H */
#   define NO_ERRNO_H
#endif /* !TCL_GENERIC_ONLY */
 
#ifdef NO_ERRNO_H
int errno;
#   define EDOM   33
#   define ERANGE 34
#endif
 
/*
 * Need DBL_MAX for IS_INF() macro...
 */
#ifndef DBL_MAX
#   ifdef MAXDOUBLE
# define DBL_MAX MAXDOUBLE
#   else /* !MAXDOUBLE */
/*
 * This value is from the Solaris headers, but doubles seem to be the
 * same size everywhere.  Long doubles aren't, but we don't use those.
 */
# define DBL_MAX 1.79769313486231570e+308
#   endif /* MAXDOUBLE */
#endif /* !DBL_MAX */
 
/*
 * Boolean flag indicating whether the Tcl bytecode interpreter has been
 * initialized.
 */
 
static int execInitialized = 0;
TCL_DECLARE_MUTEX(execMutex)
 
#ifdef TCL_COMPILE_DEBUG
/*
 * Variable that controls whether execution tracing is enabled and, if so,
 * what level of tracing is desired:
 *    0: no execution tracing
 *    1: trace invocations of Tcl procs only
 *    2: trace invocations of all (not compiled away) commands
 *    3: display each instruction executed
 * This variable is linked to the Tcl variable "tcl_traceExec".
 */
 
int tclTraceExec = 0;
#endif
 
/*
 * Mapping from expression instruction opcodes to strings; used for error
 * messages. Note that these entries must match the order and number of the
 * expression opcodes (e.g., INST_LOR) in tclCompile.h.
 */
 
static char *operatorStrings[] = {
    "||", "&&", "|", "^", "&", "==", "!=", "<", ">", "<=", ">=", "<<", ">>",
    "+", "-", "*", "/", "%", "+", "-", "~", "!",
    "BUILTIN FUNCTION", "FUNCTION",
    "", "", "", "", "", "", "", "", "eq", "ne",
};
 
/*
 * Mapping from Tcl result codes to strings; used for error and debugging
 * messages.
 */
 
#ifdef TCL_COMPILE_DEBUG
static char *resultStrings[] = {
    "TCL_OK", "TCL_ERROR", "TCL_RETURN", "TCL_BREAK", "TCL_CONTINUE"
};
#endif
 
/*
 * These are used by evalstats to monitor object usage in Tcl.
 */
 
#ifdef TCL_COMPILE_STATS
long    tclObjsAlloced = 0;
long    tclObjsFreed   = 0;
#define TCL_MAX_SHARED_OBJ_STATS 5
long    tclObjsShared[TCL_MAX_SHARED_OBJ_STATS] = { 0, 0, 0, 0, 0 };
#endif /* TCL_COMPILE_STATS */
 
/*
 * Macros for testing floating-point values for certain special cases. Test
 * for not-a-number by comparing a value against itself; test for infinity
 * by comparing against the largest floating-point value.
 */
 
#define IS_NAN(v) ((v) != (v))
#define IS_INF(v) (((v) > DBL_MAX) || ((v) < -DBL_MAX))
 
/*
 * The new macro for ending an instruction; note that a
 * reasonable C-optimiser will resolve all branches
 * at compile time. (result) is always a constant; the macro
 * NEXT_INST_F handles constant (nCleanup), NEXT_INST_V is
 * resolved at runtime for variable (nCleanup).
 *
 * ARGUMENTS:
 *    pcAdjustment: how much to increment pc
 *    nCleanup: how many objects to remove from the stack
 *    result: 0 indicates no object should be pushed on the
 *       stack; otherwise, push objResultPtr. If (result < 0),
 *       objResultPtr already has the correct reference count.
 */
 
#define NEXT_INST_F(pcAdjustment, nCleanup, result) \
     if (nCleanup == 0) {\
   if (result != 0) {\
       if ((result) > 0) {\
     PUSH_OBJECT(objResultPtr);\
       } else {\
     stackPtr[++stackTop] = objResultPtr;\
       }\
   } \
   pc += (pcAdjustment);\
   goto cleanup0;\
     } else if (result != 0) {\
   if ((result) > 0) {\
       Tcl_IncrRefCount(objResultPtr);\
   }\
   pc += (pcAdjustment);\
   switch (nCleanup) {\
       case 1: goto cleanup1_pushObjResultPtr;\
       case 2: goto cleanup2_pushObjResultPtr;\
       default: panic("ERROR: bad usage of macro NEXT_INST_F");\
   }\
     } else {\
   pc += (pcAdjustment);\
   switch (nCleanup) {\
       case 1: goto cleanup1;\
       case 2: goto cleanup2;\
       default: panic("ERROR: bad usage of macro NEXT_INST_F");\
   }\
     }
 
#define NEXT_INST_V(pcAdjustment, nCleanup, result) \
    pc += (pcAdjustment);\
    cleanup = (nCleanup);\
    if (result) {\
  if ((result) > 0) {\
      Tcl_IncrRefCount(objResultPtr);\
  }\
  goto cleanupV_pushObjResultPtr;\
    } else {\
  goto cleanupV;\
    }
 
 
/*
 * Macros used to cache often-referenced Tcl evaluation stack information
 * in local variables. Note that a DECACHE_STACK_INFO()-CACHE_STACK_INFO()
 * pair must surround any call inside TclExecuteByteCode (and a few other
 * procedures that use this scheme) that could result in a recursive call
 * to TclExecuteByteCode.
 */
 
#define CACHE_STACK_INFO() \
    stackPtr = eePtr->stackPtr; \
    stackTop = eePtr->stackTop
 
#define DECACHE_STACK_INFO() \
    eePtr->stackTop = stackTop
 
 
/*
 * Macros used to access items on the Tcl evaluation stack. PUSH_OBJECT
 * increments the object's ref count since it makes the stack have another
 * reference pointing to the object. However, POP_OBJECT does not decrement
 * the ref count. This is because the stack may hold the only reference to
 * the object, so the object would be destroyed if its ref count were
 * decremented before the caller had a chance to, e.g., store it in a
 * variable. It is the caller's responsibility to decrement the ref count
 * when it is finished with an object.
 *
 * WARNING! It is essential that objPtr only appear once in the PUSH_OBJECT
 * macro. The actual parameter might be an expression with side effects,
 * and this ensures that it will be executed only once.
 */
 
#define PUSH_OBJECT(objPtr) \
    Tcl_IncrRefCount(stackPtr[++stackTop] = (objPtr))
 
#define POP_OBJECT() \
    (stackPtr[stackTop--])
 
/*
 * Macros used to trace instruction execution. The macros TRACE,
 * TRACE_WITH_OBJ, and O2S are only used inside TclExecuteByteCode.
 * O2S is only used in TRACE* calls to get a string from an object.
 */
 
#ifdef TCL_COMPILE_DEBUG
#   define TRACE(a) \
    if (traceInstructions) { \
        fprintf(stdout, "%2d: %2d (%u) %s ", iPtr->numLevels, stackTop, \
         (unsigned int)(pc - codePtr->codeStart), \
         GetOpcodeName(pc)); \
  printf a; \
    }
#   define TRACE_APPEND(a) \
    if (traceInstructions) { \
  printf a; \
    }
#   define TRACE_WITH_OBJ(a, objPtr) \
    if (traceInstructions) { \
        fprintf(stdout, "%2d: %2d (%u) %s ", iPtr->numLevels, stackTop, \
         (unsigned int)(pc - codePtr->codeStart), \
         GetOpcodeName(pc)); \
  printf a; \
        TclPrintObject(stdout, objPtr, 30); \
        fprintf(stdout, "\n"); \
    }
#   define O2S(objPtr) \
    (objPtr ? TclGetString(objPtr) : "")
#else /* !TCL_COMPILE_DEBUG */
#   define TRACE(a)
#   define TRACE_APPEND(a)
#   define TRACE_WITH_OBJ(a, objPtr)
#   define O2S(objPtr)
#endif /* TCL_COMPILE_DEBUG */
 
/*
 * Macro to read a string containing either a wide or an int and
 * decide which it is while decoding it at the same time.  This
 * enforces the policy that integer constants between LONG_MIN and
 * LONG_MAX (inclusive) are represented by normal longs, and integer
 * constants outside that range are represented by wide ints.
 *
 * GET_WIDE_OR_INT is the same as REQUIRE_WIDE_OR_INT except it never
 * generates an error message.
 */
#define REQUIRE_WIDE_OR_INT(resultVar, objPtr, longVar, wideVar)  \
    (resultVar) = Tcl_GetWideIntFromObj(interp, (objPtr), &(wideVar));  \
    if ((resultVar) == TCL_OK && (wideVar) >= Tcl_LongAsWide(LONG_MIN)  \
      && (wideVar) <= Tcl_LongAsWide(LONG_MAX)) {     \
  (objPtr)->typePtr = &tclIntType;        \
  (objPtr)->internalRep.longValue = (longVar)     \
    = Tcl_WideAsLong(wideVar);        \
    }
#define GET_WIDE_OR_INT(resultVar, objPtr, longVar, wideVar)    \
    (resultVar) = Tcl_GetWideIntFromObj((Tcl_Interp *) NULL, (objPtr),  \
      &(wideVar));            \
    if ((resultVar) == TCL_OK && (wideVar) >= Tcl_LongAsWide(LONG_MIN)  \
      && (wideVar) <= Tcl_LongAsWide(LONG_MAX)) {     \
  (objPtr)->typePtr = &tclIntType;        \
  (objPtr)->internalRep.longValue = (longVar)     \
    = Tcl_WideAsLong(wideVar);        \
    }
/*
 * Combined with REQUIRE_WIDE_OR_INT, this gets a long value from
 * an obj.
 */
#define FORCE_LONG(objPtr, longVar, wideVar)        \
    if ((objPtr)->typePtr == &tclWideIntType) {       \
  (longVar) = Tcl_WideAsLong(wideVar);        \
    }
#define IS_INTEGER_TYPE(typePtr)          \
  ((typePtr) == &tclIntType || (typePtr) == &tclWideIntType)
#define IS_NUMERIC_TYPE(typePtr)          \
  (IS_INTEGER_TYPE(typePtr) || (typePtr) == &tclDoubleType)
 
#define W0  Tcl_LongAsWide(0)
/*
 * For tracing that uses wide values.
 */
#define LLD       "%" TCL_LL_MODIFIER "d"
 
#ifndef TCL_WIDE_INT_IS_LONG
/*
 * Extract a double value from a general numeric object.
 */
#define GET_DOUBLE_VALUE(doubleVar, objPtr, typePtr)      \
    if ((typePtr) == &tclIntType) {         \
  (doubleVar) = (double) (objPtr)->internalRep.longValue;   \
    } else if ((typePtr) == &tclWideIntType) {        \
  (doubleVar) = Tcl_WideAsDouble((objPtr)->internalRep.wideValue);\
    } else {                \
  (doubleVar) = (objPtr)->internalRep.doubleValue;    \
    }
#else /* TCL_WIDE_INT_IS_LONG */
#define GET_DOUBLE_VALUE(doubleVar, objPtr, typePtr)      \
    if (((typePtr) == &tclIntType) || ((typePtr) == &tclWideIntType)) { \
  (doubleVar) = (double) (objPtr)->internalRep.longValue;   \
    } else {                \
  (doubleVar) = (objPtr)->internalRep.doubleValue;    \
    }
#endif /* TCL_WIDE_INT_IS_LONG */
 
/*
 * Declarations for local procedures to this file:
 */
 
static int    TclExecuteByteCode _ANSI_ARGS_((Tcl_Interp *interp,
          ByteCode *codePtr));
static int    ExprAbsFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprBinaryFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprCallMathFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, int objc, Tcl_Obj **objv));
static int    ExprDoubleFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprIntFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprRandFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprRoundFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprSrandFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprUnaryFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
static int    ExprWideFunc _ANSI_ARGS_((Tcl_Interp *interp,
          ExecEnv *eePtr, ClientData clientData));
#ifdef TCL_COMPILE_STATS
static int              EvalStatsCmd _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, int objc,
          Tcl_Obj *CONST objv[]));
#endif /* TCL_COMPILE_STATS */
#ifdef TCL_COMPILE_DEBUG
static char *   GetOpcodeName _ANSI_ARGS_((unsigned char *pc));
#endif /* TCL_COMPILE_DEBUG */
static ExceptionRange * GetExceptRangeForPc _ANSI_ARGS_((unsigned char *pc,
          int catchOnly, ByteCode* codePtr));
static char *   GetSrcInfoForPc _ANSI_ARGS_((unsigned char *pc,
                ByteCode* codePtr, int *lengthPtr));
static void   GrowEvaluationStack _ANSI_ARGS_((ExecEnv *eePtr));
static void   IllegalExprOperandType _ANSI_ARGS_((
          Tcl_Interp *interp, unsigned char *pc,
          Tcl_Obj *opndPtr));
static void   InitByteCodeExecution _ANSI_ARGS_((
          Tcl_Interp *interp));
#ifdef TCL_COMPILE_DEBUG
static void   PrintByteCodeInfo _ANSI_ARGS_((ByteCode *codePtr));
static char *   StringForResultCode _ANSI_ARGS_((int result));
static void   ValidatePcAndStackTop _ANSI_ARGS_((
          ByteCode *codePtr, unsigned char *pc,
          int stackTop, int stackLowerBound));
#endif /* TCL_COMPILE_DEBUG */
static int    VerifyExprObjType _ANSI_ARGS_((Tcl_Interp *interp,
          Tcl_Obj *objPtr));
 
/*
 * Table describing the built-in math functions. Entries in this table are
 * indexed by the values of the INST_CALL_BUILTIN_FUNC instruction's
 * operand byte.
 */
 
BuiltinFunc tclBuiltinFuncTable[] = {
#ifndef TCL_NO_MATH
    {"acos", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) acos},
    {"asin", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) asin},
    {"atan", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) atan},
    {"atan2", 2, {TCL_DOUBLE, TCL_DOUBLE}, ExprBinaryFunc, (ClientData) atan2},
    {"ceil", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) ceil},
    {"cos", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) cos},
    {"cosh", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) cosh},
    {"exp", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) exp},
    {"floor", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) floor},
    {"fmod", 2, {TCL_DOUBLE, TCL_DOUBLE}, ExprBinaryFunc, (ClientData) fmod},
    {"hypot", 2, {TCL_DOUBLE, TCL_DOUBLE}, ExprBinaryFunc, (ClientData) hypot},
    {"log", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) log},
    {"log10", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) log10},
    {"pow", 2, {TCL_DOUBLE, TCL_DOUBLE}, ExprBinaryFunc, (ClientData) pow},
    {"sin", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) sin},
    {"sinh", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) sinh},
    {"sqrt", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) sqrt},
    {"tan", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) tan},
    {"tanh", 1, {TCL_DOUBLE}, ExprUnaryFunc, (ClientData) tanh},
#endif
    {"abs", 1, {TCL_EITHER}, ExprAbsFunc, 0},
    {"double", 1, {TCL_EITHER}, ExprDoubleFunc, 0},
    {"int", 1, {TCL_EITHER}, ExprIntFunc, 0},
    {"rand", 0, {TCL_EITHER}, ExprRandFunc, 0}, /* NOTE: rand takes no args. */
    {"round", 1, {TCL_EITHER}, ExprRoundFunc, 0},
    {"srand", 1, {TCL_INT}, ExprSrandFunc, 0},
    {"wide", 1, {TCL_EITHER}, ExprWideFunc, 0},
    {0},
};
 
/*
 *----------------------------------------------------------------------
 *
 * InitByteCodeExecution --
 *
 *  This procedure is called once to initialize the Tcl bytecode
 *  interpreter.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  This procedure initializes the array of instruction names. If
 *  compiling with the TCL_COMPILE_STATS flag, it initializes the
 *  array that counts the executions of each instruction and it
 *  creates the "evalstats" command. It also establishes the link
 *      between the Tcl "tcl_traceExec" and C "tclTraceExec" variables.
 *
 *----------------------------------------------------------------------
 */
 
static void
InitByteCodeExecution(interp)
    Tcl_Interp *interp;   /* Interpreter for which the Tcl variable
         * "tcl_traceExec" is linked to control
         * instruction tracing. */
{
#ifdef TCL_COMPILE_DEBUG
    if (Tcl_LinkVar(interp, "tcl_traceExec", (char *) &tclTraceExec,
        TCL_LINK_INT) != TCL_OK) {
  panic("InitByteCodeExecution: can't create link for tcl_traceExec variable");
    }
#endif
#ifdef TCL_COMPILE_STATS
    Tcl_CreateObjCommand(interp, "evalstats", EvalStatsCmd,
      (ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);
#endif /* TCL_COMPILE_STATS */
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclCreateExecEnv --
 *
 *  This procedure creates a new execution environment for Tcl bytecode
 *  execution. An ExecEnv points to a Tcl evaluation stack. An ExecEnv
 *  is typically created once for each Tcl interpreter (Interp
 *  structure) and recursively passed to TclExecuteByteCode to execute
 *  ByteCode sequences for nested commands.
 *
 * Results:
 *  A newly allocated ExecEnv is returned. This points to an empty
 *  evaluation stack of the standard initial size.
 *
 * Side effects:
 *  The bytecode interpreter is also initialized here, as this
 *  procedure will be called before any call to TclExecuteByteCode.
 *
 *----------------------------------------------------------------------
 */
 
#define TCL_STACK_INITIAL_SIZE 2000
 
ExecEnv *
TclCreateExecEnv(interp)
    Tcl_Interp *interp;   /* Interpreter for which the execution
         * environment is being created. */
{
    ExecEnv *eePtr = (ExecEnv *) ckalloc(sizeof(ExecEnv));
    Tcl_Obj **stackPtr;
 
    stackPtr = (Tcl_Obj **)
  ckalloc((size_t) (TCL_STACK_INITIAL_SIZE * sizeof(Tcl_Obj *)));
 
    /*
     * Use the bottom pointer to keep a reference count; the
     * execution environment holds a reference.
     */
 
    stackPtr++;
    eePtr->stackPtr = stackPtr;
    stackPtr[-1] = (Tcl_Obj *) ((char *) 1);
 
    eePtr->stackTop = -1;
    eePtr->stackEnd = (TCL_STACK_INITIAL_SIZE - 2);
 
    eePtr->errorInfo = Tcl_NewStringObj("::errorInfo", -1);
    Tcl_IncrRefCount(eePtr->errorInfo);
 
    eePtr->errorCode = Tcl_NewStringObj("::errorCode", -1);
    Tcl_IncrRefCount(eePtr->errorCode);
 
    Tcl_MutexLock(&execMutex);
    if (!execInitialized) {
  TclInitAuxDataTypeTable();
  InitByteCodeExecution(interp);
  execInitialized = 1;
    }
    Tcl_MutexUnlock(&execMutex);
 
    return eePtr;
}
#undef TCL_STACK_INITIAL_SIZE
 
/*
 *----------------------------------------------------------------------
 *
 * TclDeleteExecEnv --
 *
 *  Frees the storage for an ExecEnv.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  Storage for an ExecEnv and its contained storage (e.g. the
 *  evaluation stack) is freed.
 *
 *----------------------------------------------------------------------
 */
 
void
TclDeleteExecEnv(eePtr)
    ExecEnv *eePtr;   /* Execution environment to free. */
{
    if (eePtr->stackPtr[-1] == (Tcl_Obj *) ((char *) 1)) {
  ckfree((char *) (eePtr->stackPtr-1));
    } else {
  panic("ERROR: freeing an execEnv whose stack is still in use.\n");
    }
    TclDecrRefCount(eePtr->errorInfo);
    TclDecrRefCount(eePtr->errorCode);
    ckfree((char *) eePtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeExecution --
 *
 *  Finalizes the execution environment setup so that it can be
 *  later reinitialized.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  After this call, the next time TclCreateExecEnv will be called
 *  it will call InitByteCodeExecution.
 *
 *----------------------------------------------------------------------
 */
 
void
TclFinalizeExecution()
{
    Tcl_MutexLock(&execMutex);
    execInitialized = 0;
    Tcl_MutexUnlock(&execMutex);
    TclFinalizeAuxDataTypeTable();
}
 
/*
 *----------------------------------------------------------------------
 *
 * GrowEvaluationStack --
 *
 *  This procedure grows a Tcl evaluation stack stored in an ExecEnv.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  The size of the evaluation stack is doubled.
 *
 *----------------------------------------------------------------------
 */
 
static void
GrowEvaluationStack(eePtr)
    register ExecEnv *eePtr; /* Points to the ExecEnv with an evaluation
            * stack to enlarge. */
{
    /*
     * The current Tcl stack elements are stored from eePtr->stackPtr[0]
     * to eePtr->stackPtr[eePtr->stackEnd] (inclusive).
     */
 
    int currElems = (eePtr->stackEnd + 1);
    int newElems  = 2*currElems;
    int currBytes = currElems * sizeof(Tcl_Obj *);
    int newBytes  = 2*currBytes;
    Tcl_Obj **newStackPtr = (Tcl_Obj **) ckalloc((unsigned) newBytes);
    Tcl_Obj **oldStackPtr = eePtr->stackPtr;
 
    /*
     * We keep the stack reference count as a (char *), as that
     * works nicely as a portable pointer-sized counter.
     */
 
    char *refCount = (char *) oldStackPtr[-1];
 
    /*
     * Copy the existing stack items to the new stack space, free the old
     * storage if appropriate, and record the refCount of the new stack
     * held by the environment.
     */
 
    newStackPtr++;
    memcpy((VOID *) newStackPtr, (VOID *) oldStackPtr,
     (size_t) currBytes);
 
    if (refCount == (char *) 1) {
  ckfree((VOID *) (oldStackPtr-1));
    } else {
  /*
   * Remove the reference corresponding to the
   * environment pointer.
   */
 
  oldStackPtr[-1] = (Tcl_Obj *) (refCount-1);
    }
 
    eePtr->stackPtr = newStackPtr;
    eePtr->stackEnd = (newElems - 2); /* index of last usable item */
    newStackPtr[-1] = (Tcl_Obj *) ((char *) 1);
}
 
/*
 *--------------------------------------------------------------
 *
 * Tcl_ExprObj --
 *
 *  Evaluate an expression in a Tcl_Obj.
 *
 * Results:
 *  A standard Tcl object result. If the result is other than TCL_OK,
 *  then the interpreter's result contains an error message. If the
 *  result is TCL_OK, then a pointer to the expression's result value
 *  object is stored in resultPtrPtr. In that case, the object's ref
 *  count is incremented to reflect the reference returned to the
 *  caller; the caller is then responsible for the resulting object
 *  and must, for example, decrement the ref count when it is finished
 *  with the object.
 *
 * Side effects:
 *  Any side effects caused by subcommands in the expression, if any.
 *  The interpreter result is not modified unless there is an error.
 *
 *--------------------------------------------------------------
 */
 
int
Tcl_ExprObj(interp, objPtr, resultPtrPtr)
    Tcl_Interp *interp;   /* Context in which to evaluate the
         * expression. */
    register Tcl_Obj *objPtr; /* Points to Tcl object containing
         * expression to evaluate. */
    Tcl_Obj **resultPtrPtr; /* Where the Tcl_Obj* that is the expression
         * result is stored if no errors occur. */
{
    Interp *iPtr = (Interp *) interp;
    CompileEnv compEnv;   /* Compilation environment structure
         * allocated in frame. */
    LiteralTable *localTablePtr = &(compEnv.localLitTable);
    register ByteCode *codePtr = NULL;
            /* Tcl Internal type of bytecode.
         * Initialized to avoid compiler warning. */
    AuxData *auxDataPtr;
    LiteralEntry *entryPtr;
    Tcl_Obj *saveObjPtr;
    char *string;
    int length, i, result;
 
    /*
     * First handle some common expressions specially.
     */
 
    string = Tcl_GetStringFromObj(objPtr, &length);
    if (length == 1) {
  if (*string == '0') {
      *resultPtrPtr = Tcl_NewLongObj(0);
      Tcl_IncrRefCount(*resultPtrPtr);
      return TCL_OK;
  } else if (*string == '1') {
      *resultPtrPtr = Tcl_NewLongObj(1);
      Tcl_IncrRefCount(*resultPtrPtr);
      return TCL_OK;
  }
    } else if ((length == 2) && (*string == '!')) {
  if (*(string+1) == '0') {
      *resultPtrPtr = Tcl_NewLongObj(1);
      Tcl_IncrRefCount(*resultPtrPtr);
      return TCL_OK;
  } else if (*(string+1) == '1') {
      *resultPtrPtr = Tcl_NewLongObj(0);
      Tcl_IncrRefCount(*resultPtrPtr);
      return TCL_OK;
  }
    }
 
    /*
     * Get the ByteCode from the object. If it exists, make sure it hasn't
     * been invalidated by, e.g., someone redefining a command with a
     * compile procedure (this might make the compiled code wrong). If
     * necessary, convert the object to be a ByteCode object and compile it.
     * Also, if the code was compiled in/for a different interpreter, we
     * recompile it.
     *
     * Precompiled expressions, however, are immutable and therefore
     * they are not recompiled, even if the epoch has changed.
     *
     */
 
    if (objPtr->typePtr == &tclByteCodeType) {
  codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr;
  if (((Interp *) *codePtr->interpHandle != iPtr)
          || (codePtr->compileEpoch != iPtr->compileEpoch)) {
            if (codePtr->flags & TCL_BYTECODE_PRECOMPILED) {
                if ((Interp *) *codePtr->interpHandle != iPtr) {
                    panic("Tcl_ExprObj: compiled expression jumped interps");
                }
          codePtr->compileEpoch = iPtr->compileEpoch;
            } else {
                (*tclByteCodeType.freeIntRepProc)(objPtr);
                objPtr->typePtr = (Tcl_ObjType *) NULL;
            }
  }
    }
    if (objPtr->typePtr != &tclByteCodeType) {
  TclInitCompileEnv(interp, &compEnv, string, length);
  result = TclCompileExpr(interp, string, length, &compEnv);
 
  /*
   * Free the compilation environment's literal table bucket array if
   * it was dynamically allocated.
   */
 
  if (localTablePtr->buckets != localTablePtr->staticBuckets) {
      ckfree((char *) localTablePtr->buckets);
  }
 
  if (result != TCL_OK) {
      /*
       * Compilation errors. Free storage allocated for compilation.
       */
 
#ifdef TCL_COMPILE_DEBUG
      TclVerifyLocalLiteralTable(&compEnv);
#endif /*TCL_COMPILE_DEBUG*/
      entryPtr = compEnv.literalArrayPtr;
      for (i = 0;  i < compEnv.literalArrayNext;  i++) {
    TclReleaseLiteral(interp, entryPtr->objPtr);
    entryPtr++;
      }
#ifdef TCL_COMPILE_DEBUG
      TclVerifyGlobalLiteralTable(iPtr);
#endif /*TCL_COMPILE_DEBUG*/
 
      auxDataPtr = compEnv.auxDataArrayPtr;
      for (i = 0;  i < compEnv.auxDataArrayNext;  i++) {
    if (auxDataPtr->type->freeProc != NULL) {
        auxDataPtr->type->freeProc(auxDataPtr->clientData);
    }
    auxDataPtr++;
      }
      TclFreeCompileEnv(&compEnv);
      return result;
  }
 
  /*
   * Successful compilation. If the expression yielded no
   * instructions, push an zero object as the expression's result.
   */
 
  if (compEnv.codeNext == compEnv.codeStart) {
      TclEmitPush(TclRegisterLiteral(&compEnv, "0", 1, /*onHeap*/ 0),
              &compEnv);
  }
 
  /*
   * Add a "done" instruction as the last instruction and change the
   * object into a ByteCode object. Ownership of the literal objects
   * and aux data items is given to the ByteCode object.
   */
 
  compEnv.numSrcBytes = iPtr->termOffset;
  TclEmitOpcode(INST_DONE, &compEnv);
  TclInitByteCodeObj(objPtr, &compEnv);
  TclFreeCompileEnv(&compEnv);
  codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr;
#ifdef TCL_COMPILE_DEBUG
  if (tclTraceCompile == 2) {
      TclPrintByteCodeObj(interp, objPtr);
  }
#endif /* TCL_COMPILE_DEBUG */
    }
 
    /*
     * Execute the expression after first saving the interpreter's result.
     */
 
    saveObjPtr = Tcl_GetObjResult(interp);
    Tcl_IncrRefCount(saveObjPtr);
    Tcl_ResetResult(interp);
 
    /*
     * Increment the code's ref count while it is being executed. If
     * afterwards no references to it remain, free the code.
     */
 
    codePtr->refCount++;
    result = TclExecuteByteCode(interp, codePtr);
    codePtr->refCount--;
    if (codePtr->refCount <= 0) {
  TclCleanupByteCode(codePtr);
  objPtr->typePtr = NULL;
  objPtr->internalRep.otherValuePtr = NULL;
    }
 
    /*
     * If the expression evaluated successfully, store a pointer to its
     * value object in resultPtrPtr then restore the old interpreter result.
     * We increment the object's ref count to reflect the reference that we
     * are returning to the caller. We also decrement the ref count of the
     * interpreter's result object after calling Tcl_SetResult since we
     * next store into that field directly.
     */
 
    if (result == TCL_OK) {
  *resultPtrPtr = iPtr->objResultPtr;
  Tcl_IncrRefCount(iPtr->objResultPtr);
 
  Tcl_SetObjResult(interp, saveObjPtr);
    }
    TclDecrRefCount(saveObjPtr);
    return result;
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclCompEvalObj --
 *
 *  This procedure evaluates the script contained in a Tcl_Obj by
 *      first compiling it and then passing it to TclExecuteByteCode.
 *
 * Results:
 *  The return value is one of the return codes defined in tcl.h
 *  (such as TCL_OK), and interp->objResultPtr refers to a Tcl object
 *  that either contains the result of executing the code or an
 *  error message.
 *
 * Side effects:
 *  Almost certainly, depending on the ByteCode's instructions.
 *
 *----------------------------------------------------------------------
 */
 
int
TclCompEvalObj(interp, objPtr)
    Tcl_Interp *interp;
    Tcl_Obj *objPtr;
{
    register Interp *iPtr = (Interp *) interp;
    register ByteCode* codePtr;   /* Tcl Internal type of bytecode. */
    int oldCount = iPtr->cmdCount;  /* Used to tell whether any commands
           * at all were executed. */
    char *script;
    int numSrcBytes;
    int result;
    Namespace *namespacePtr;
 
 
    /*
     * Check that the interpreter is ready to execute scripts
     */
 
    iPtr->numLevels++;
    if (TclInterpReady(interp) == TCL_ERROR) {
  iPtr->numLevels--;
  return TCL_ERROR;
    }
 
    if (iPtr->varFramePtr != NULL) {
        namespacePtr = iPtr->varFramePtr->nsPtr;
    } else {
        namespacePtr = iPtr->globalNsPtr;
    }
 
    /*
     * If the object is not already of tclByteCodeType, compile it (and
     * reset the compilation flags in the interpreter; this should be
     * done after any compilation).
     * Otherwise, check that it is "fresh" enough.
     */
 
    if (objPtr->typePtr != &tclByteCodeType) {
        recompileObj:
  iPtr->errorLine = 1;
  result = tclByteCodeType.setFromAnyProc(interp, objPtr);
  if (result != TCL_OK) {
      iPtr->numLevels--;
      return result;
  }
  codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr;
    } else {
  /*
   * Make sure the Bytecode hasn't been invalidated by, e.g., someone
   * redefining a command with a compile procedure (this might make the
   * compiled code wrong).
   * The object needs to be recompiled if it was compiled in/for a
   * different interpreter, or for a different namespace, or for the
   * same namespace but with different name resolution rules.
   * Precompiled objects, however, are immutable and therefore
   * they are not recompiled, even if the epoch has changed.
   *
   * To be pedantically correct, we should also check that the
   * originating procPtr is the same as the current context procPtr
   * (assuming one exists at all - none for global level).  This
   * code is #def'ed out because [info body] was changed to never
   * return a bytecode type object, which should obviate us from
   * the extra checks here.
   */
  codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr;
  if (((Interp *) *codePtr->interpHandle != iPtr)
          || (codePtr->compileEpoch != iPtr->compileEpoch)
#ifdef CHECK_PROC_ORIGINATION /* [Bug: 3412 Pedantic] */
    || (codePtr->procPtr != NULL && !(iPtr->varFramePtr &&
      iPtr->varFramePtr->procPtr == codePtr->procPtr))
#endif
          || (codePtr->nsPtr != namespacePtr)
          || (codePtr->nsEpoch != namespacePtr->resolverEpoch)) {
            if (codePtr->flags & TCL_BYTECODE_PRECOMPILED) {
                if ((Interp *) *codePtr->interpHandle != iPtr) {
                    panic("Tcl_EvalObj: compiled script jumped interps");
                }
          codePtr->compileEpoch = iPtr->compileEpoch;
            } else {
    /*
     * This byteCode is invalid: free it and recompile
     */
                tclByteCodeType.freeIntRepProc(objPtr);
    goto recompileObj;
      }
  }
    }
 
    /*
     * Execute the commands. If the code was compiled from an empty string,
     * don't bother executing the code.
     */
 
    numSrcBytes = codePtr->numSrcBytes;
    if ((numSrcBytes > 0) || (codePtr->flags & TCL_BYTECODE_PRECOMPILED)) {
  /*
   * Increment the code's ref count while it is being executed. If
   * afterwards no references to it remain, free the code.
   */
 
  codePtr->refCount++;
  result = TclExecuteByteCode(interp, codePtr);
  codePtr->refCount--;
  if (codePtr->refCount <= 0) {
      TclCleanupByteCode(codePtr);
  }
    } else {
  result = TCL_OK;
    }
    iPtr->numLevels--;
 
 
    /*
     * If no commands at all were executed, check for asynchronous
     * handlers so that they at least get one change to execute.
     * This is needed to handle event loops written in Tcl with
     * empty bodies.
     */
 
    if ((oldCount == iPtr->cmdCount) && Tcl_AsyncReady()) {
  result = Tcl_AsyncInvoke(interp, result);
 
 
  /*
   * If an error occurred, record information about what was being
   * executed when the error occurred.
   */
 
  if ((result == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) {
      script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);
      Tcl_LogCommandInfo(interp, script, script, numSrcBytes);
  }
    }
 
    /*
     * Set the interpreter's termOffset member to the offset of the
     * character just after the last one executed. We approximate the offset
     * of the last character executed by using the number of characters
     * compiled.
     */
 
    iPtr->termOffset = numSrcBytes;
    iPtr->flags &= ~ERR_ALREADY_LOGGED;
 
    return result;
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclExecuteByteCode --
 *
 *  This procedure executes the instructions of a ByteCode structure.
 *  It returns when a "done" instruction is executed or an error occurs.
 *
 * Results:
 *  The return value is one of the return codes defined in tcl.h
 *  (such as TCL_OK), and interp->objResultPtr refers to a Tcl object
 *  that either contains the result of executing the code or an
 *  error message.
 *
 * Side effects:
 *  Almost certainly, depending on the ByteCode's instructions.
 *
 *----------------------------------------------------------------------
 */
 
static int
TclExecuteByteCode(interp, codePtr)
    Tcl_Interp *interp;   /* Token for command interpreter. */
    ByteCode *codePtr;    /* The bytecode sequence to interpret. */
{
    Interp *iPtr = (Interp *) interp;
    ExecEnv *eePtr = iPtr->execEnvPtr;
            /* Points to the execution environment. */
    register Tcl_Obj **stackPtr = eePtr->stackPtr;
            /* Cached evaluation stack base pointer. */
    register int stackTop = eePtr->stackTop;
            /* Cached top index of evaluation stack. */
    register unsigned char *pc = codePtr->codeStart;
        /* The current program counter. */
    int opnd;     /* Current instruction's operand byte(s). */
    int pcAdjustment;   /* Hold pc adjustment after instruction. */
    int initStackTop = stackTop;/* Stack top at start of execution. */
    ExceptionRange *rangePtr; /* Points to closest loop or catch exception
         * range enclosing the pc. Used by various
         * instructions and processCatch to
         * process break, continue, and errors. */
    int result = TCL_OK;  /* Return code returned after execution. */
    int storeFlags;
    Tcl_Obj *valuePtr, *value2Ptr, *objPtr;
    char *bytes;
    int length;
    long i = 0;     /* Init. avoids compiler warning. */
    Tcl_WideInt w;
    register int cleanup;
    Tcl_Obj *objResultPtr;
    char *part1, *part2;
    Var *varPtr, *arrayPtr;
    CallFrame *varFramePtr = iPtr->varFramePtr;
#ifdef TCL_COMPILE_DEBUG
    int traceInstructions = (tclTraceExec == 3);
    char cmdNameBuf[21];
#endif
 
    /*
     * This procedure uses a stack to hold information about catch commands.
     * This information is the current operand stack top when starting to
     * execute the code for each catch command. It starts out with stack-
     * allocated space but uses dynamically-allocated storage if needed.
     */
 
#define STATIC_CATCH_STACK_SIZE 4
    int (catchStackStorage[STATIC_CATCH_STACK_SIZE]);
    int *catchStackPtr = catchStackStorage;
    int catchTop = -1;
 
#ifdef TCL_COMPILE_DEBUG
    if (tclTraceExec >= 2) {
  PrintByteCodeInfo(codePtr);
  fprintf(stdout, "  Starting stack top=%d\n", eePtr->stackTop);
  fflush(stdout);
    }
    opnd = 0;     /* Init. avoids compiler warning. */
#endif
 
#ifdef TCL_COMPILE_STATS
    iPtr->stats.numExecutions++;
#endif
 
    /*
     * Make sure the catch stack is large enough to hold the maximum number
     * of catch commands that could ever be executing at the same time. This
     * will be no more than the exception range array's depth.
     */
 
    if (codePtr->maxExceptDepth > STATIC_CATCH_STACK_SIZE) {
  catchStackPtr = (int *)
          ckalloc(codePtr->maxExceptDepth * sizeof(int));
    }
 
    /*
     * Make sure the stack has enough room to execute this ByteCode.
     */
 
    while ((stackTop + codePtr->maxStackDepth) > eePtr->stackEnd) {
        GrowEvaluationStack(eePtr);
        stackPtr = eePtr->stackPtr;
    }
 
    /*
     * Loop executing instructions until a "done" instruction, a
     * TCL_RETURN, or some error.
     */
 
    goto cleanup0;
 
 
    /*
     * Targets for standard instruction endings; unrolled
     * for speed in the most frequent cases (instructions that
     * consume up to two stack elements).
     *
     * This used to be a "for(;;)" loop, with each instruction doing
     * its own cleanup.
     */
 
    cleanupV_pushObjResultPtr:
    switch (cleanup) {
        case 0:
      stackPtr[++stackTop] = (objResultPtr);
      goto cleanup0;
        default:
      cleanup -= 2;
      while (cleanup--) {
    valuePtr = POP_OBJECT();
    TclDecrRefCount(valuePtr);
      }
        case 2:
        cleanup2_pushObjResultPtr:
      valuePtr = POP_OBJECT();
      TclDecrRefCount(valuePtr);
        case 1:
        cleanup1_pushObjResultPtr:
      valuePtr = stackPtr[stackTop];
      TclDecrRefCount(valuePtr);
    }
    stackPtr[stackTop] = objResultPtr;
    goto cleanup0;
 
    cleanupV:
    switch (cleanup) {
        default:
      cleanup -= 2;
      while (cleanup--) {
    valuePtr = POP_OBJECT();
    TclDecrRefCount(valuePtr);
      }
        case 2:
        cleanup2:
      valuePtr = POP_OBJECT();
      TclDecrRefCount(valuePtr);
        case 1:
        cleanup1:
      valuePtr = POP_OBJECT();
      TclDecrRefCount(valuePtr);
        case 0:
      /*
       * We really want to do nothing now, but this is needed
       * for some compilers (SunPro CC)
       */
      break;
    }
 
    cleanup0:
 
#ifdef TCL_COMPILE_DEBUG
    ValidatePcAndStackTop(codePtr, pc, stackTop, initStackTop);
    if (traceInstructions) {
  fprintf(stdout, "%2d: %2d ", iPtr->numLevels, stackTop);
  TclPrintInstruction(codePtr, pc);
  fflush(stdout);
    }
#endif /* TCL_COMPILE_DEBUG */
 
#ifdef TCL_COMPILE_STATS
    iPtr->stats.instructionCount[*pc]++;
#endif
    switch (*pc) {
    case INST_DONE:
  if (stackTop <= initStackTop) {
      stackTop--;
      goto abnormalReturn;
  }
 
  /*
   * Set the interpreter's object result to point to the
   * topmost object from the stack, and check for a possible
   * [catch]. The stackTop's level and refCount will be handled
   * by "processCatch" or "abnormalReturn".
   */
 
  valuePtr = stackPtr[stackTop];
  Tcl_SetObjResult(interp, valuePtr);
#ifdef TCL_COMPILE_DEBUG
  TRACE_WITH_OBJ(("=> return code=%d, result=", result),
          iPtr->objResultPtr);
  if (traceInstructions) {
      fprintf(stdout, "\n");
  }
#endif
  goto checkForCatch;
 
    case INST_PUSH1:
  objResultPtr = codePtr->objArrayPtr[TclGetUInt1AtPtr(pc+1)];
  TRACE_WITH_OBJ(("%u => ", TclGetInt1AtPtr(pc+1)), objResultPtr);
  NEXT_INST_F(2, 0, 1);
 
    case INST_PUSH4:
  objResultPtr = codePtr->objArrayPtr[TclGetUInt4AtPtr(pc+1)];
  TRACE_WITH_OBJ(("%u => ", TclGetUInt4AtPtr(pc+1)), objResultPtr);
  NEXT_INST_F(5, 0, 1);
 
    case INST_POP:
  TRACE_WITH_OBJ(("=> discarding "), stackPtr[stackTop]);
  valuePtr = POP_OBJECT();
  TclDecrRefCount(valuePtr);
  NEXT_INST_F(1, 0, 0);
 
    case INST_DUP:
  objResultPtr = stackPtr[stackTop];
  TRACE_WITH_OBJ(("=> "), objResultPtr);
  NEXT_INST_F(1, 0, 1);
 
    case INST_OVER:
  opnd = TclGetUInt4AtPtr( pc+1 );
  objResultPtr = stackPtr[ stackTop - opnd ];
  TRACE_WITH_OBJ(("=> "), objResultPtr);
  NEXT_INST_F(5, 0, 1);
 
    case INST_CONCAT1:
  opnd = TclGetUInt1AtPtr(pc+1);
  {
      int totalLen = 0;
 
      /*
       * Peephole optimisation for appending an empty string.
       * This enables replacing 'K $x [set x{}]' by '$x[set x{}]'
       * for fastest execution. Avoid doing the optimisation for wide
       * ints - a case where equal strings may refer to different values
       * (see [Bug 1251791]).
       */
 
      if ((opnd == 2) && (stackPtr[stackTop-1]->typePtr != &tclWideIntType)) {
    Tcl_GetStringFromObj(stackPtr[stackTop], &length);
    if (length == 0) {
        /* Just drop the top item from the stack */
        NEXT_INST_F(2, 1, 0);
    }
      }
 
      /*
       * Concatenate strings (with no separators) from the top
       * opnd items on the stack starting with the deepest item.
       * First, determine how many characters are needed.
       */
 
      for (i = (stackTop - (opnd-1));  i <= stackTop;  i++) {
    bytes = Tcl_GetStringFromObj(stackPtr[i], &length);
    if (bytes != NULL) {
        totalLen += length;
    }
      }
 
      /*
       * Initialize the new append string object by appending the
       * strings of the opnd stack objects. Also pop the objects.
       */
 
      TclNewObj(objResultPtr);
      if (totalLen > 0) {
    char *p = (char *) ckalloc((unsigned) (totalLen + 1));
    objResultPtr->bytes = p;
    objResultPtr->length = totalLen;
    for (i = (stackTop - (opnd-1));  i <= stackTop;  i++) {
        valuePtr = stackPtr[i];
        bytes = Tcl_GetStringFromObj(valuePtr, &length);
        if (bytes != NULL) {
      memcpy((VOID *) p, (VOID *) bytes,
             (size_t) length);
      p += length;
        }
    }
    *p = '\0';
      }
 
      TRACE_WITH_OBJ(("%u => ", opnd), objResultPtr);
      NEXT_INST_V(2, opnd, 1);
  }
 
    case INST_INVOKE_STK4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  goto doInvocation;
 
    case INST_INVOKE_STK1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
 
    doInvocation:
  {
      int objc = opnd; /* The number of arguments. */
      Tcl_Obj **objv;  /* The array of argument objects. */
 
      /*
       * We keep the stack reference count as a (char *), as that
       * works nicely as a portable pointer-sized counter.
       */
 
      char **preservedStackRefCountPtr;
 
      /*
       * Reference to memory block containing
       * objv array (must be kept live throughout
       * trace and command invokations.)
       */
 
      objv = &(stackPtr[stackTop - (objc-1)]);
 
#ifdef TCL_COMPILE_DEBUG
      if (tclTraceExec >= 2) {
    if (traceInstructions) {
        strncpy(cmdNameBuf, TclGetString(objv[0]), 20);
        TRACE(("%u => call ", objc));
    } else {
        fprintf(stdout, "%d: (%u) invoking ",
          iPtr->numLevels,
          (unsigned int)(pc - codePtr->codeStart));
    }
    for (i = 0;  i < objc;  i++) {
        TclPrintObject(stdout, objv[i], 15);
        fprintf(stdout, " ");
    }
    fprintf(stdout, "\n");
    fflush(stdout);
      }
#endif /*TCL_COMPILE_DEBUG*/
 
      /*
       * If trace procedures will be called, we need a
       * command string to pass to TclEvalObjvInternal; note
       * that a copy of the string will be made there to
       * include the ending \0.
       */
 
      bytes = NULL;
      length = 0;
      if (iPtr->tracePtr != NULL) {
    Trace *tracePtr, *nextTracePtr;
 
    for (tracePtr = iPtr->tracePtr;  tracePtr != NULL;
         tracePtr = nextTracePtr) {
        nextTracePtr = tracePtr->nextPtr;
        if (tracePtr->level == 0 ||
      iPtr->numLevels <= tracePtr->level) {
      /*
       * Traces will be called: get command string
       */
 
      bytes = GetSrcInfoForPc(pc, codePtr, &length);
      break;
        }
    }
      } else {
    Command *cmdPtr;
    cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, objv[0]);
    if ((cmdPtr != NULL) && (cmdPtr->flags & CMD_HAS_EXEC_TRACES)) {
        bytes = GetSrcInfoForPc(pc, codePtr, &length);
    }
      }
 
      /*
       * A reference to part of the stack vector itself
       * escapes our control: increase its refCount
       * to stop it from being deallocated by a recursive
       * call to ourselves.  The extra variable is needed
       * because all others are liable to change due to the
       * trace procedures.
       */
 
      preservedStackRefCountPtr = (char **) (stackPtr-1);
      ++*preservedStackRefCountPtr;
 
      /*
       * Finally, let TclEvalObjvInternal handle the command.
       */
 
      DECACHE_STACK_INFO();
      Tcl_ResetResult(interp);
      result = TclEvalObjvInternal(interp, objc, objv, bytes, length, 0);
      CACHE_STACK_INFO();
 
      /*
       * If the old stack is going to be released, it is
       * safe to do so now, since no references to objv are
       * going to be used from now on.
       */
 
      --*preservedStackRefCountPtr;
      if (*preservedStackRefCountPtr == (char *) 0) {
    ckfree((VOID *) preservedStackRefCountPtr);
      }
 
      if (result == TCL_OK) {
    /*
     * Push the call's object result and continue execution
     * with the next instruction.
     */
 
    TRACE_WITH_OBJ(("%u => ... after \"%.20s\": TCL_OK, result=",
            objc, cmdNameBuf), Tcl_GetObjResult(interp));
 
    objResultPtr = Tcl_GetObjResult(interp);
 
    /*
     * Reset the interp's result to avoid possible duplications
     * of large objects [Bug 781585]. We do not call
     * Tcl_ResetResult() to avoid any side effects caused by
     * the resetting of errorInfo and errorCode [Bug 804681],
     * which are not needed here. We chose instead to manipulate
     * the interp's object result directly.
     *
     * Note that the result object is now in objResultPtr, it
     * keeps the refCount it had in its role of iPtr->objResultPtr.
     */
    {
        Tcl_Obj *newObjResultPtr;
        TclNewObj(newObjResultPtr);
        Tcl_IncrRefCount(newObjResultPtr);
        iPtr->objResultPtr = newObjResultPtr;
    }
 
    NEXT_INST_V(pcAdjustment, opnd, -1);
      } else {
    cleanup = opnd;
    goto processExceptionReturn;
      }
  }
 
    case INST_EVAL_STK:
  /*
   * Note to maintainers: it is important that INST_EVAL_STK
   * pop its argument from the stack before jumping to
   * checkForCatch! DO NOT OPTIMISE!
   */
 
  objPtr = stackPtr[stackTop];
  DECACHE_STACK_INFO();
  result = TclCompEvalObj(interp, objPtr);
  CACHE_STACK_INFO();
  if (result == TCL_OK) {
      /*
       * Normal return; push the eval's object result.
       */
 
      objResultPtr = Tcl_GetObjResult(interp);
      TRACE_WITH_OBJ(("\"%.30s\" => ", O2S(objPtr)),
         Tcl_GetObjResult(interp));
 
      /*
       * Reset the interp's result to avoid possible duplications
       * of large objects [Bug 781585]. We do not call
       * Tcl_ResetResult() to avoid any side effects caused by
       * the resetting of errorInfo and errorCode [Bug 804681],
       * which are not needed here. We chose instead to manipulate
       * the interp's object result directly.
       *
       * Note that the result object is now in objResultPtr, it
       * keeps the refCount it had in its role of iPtr->objResultPtr.
       */
      {
          Tcl_Obj *newObjResultPtr;
    TclNewObj(newObjResultPtr);
    Tcl_IncrRefCount(newObjResultPtr);
    iPtr->objResultPtr = newObjResultPtr;
      }
 
      NEXT_INST_F(1, 1, -1);
  } else {
      cleanup = 1;
      goto processExceptionReturn;
  }
 
    case INST_EXPR_STK:
  objPtr = stackPtr[stackTop];
  DECACHE_STACK_INFO();
  Tcl_ResetResult(interp);
  result = Tcl_ExprObj(interp, objPtr, &valuePtr);
  CACHE_STACK_INFO();
  if (result != TCL_OK) {
      TRACE_WITH_OBJ(("\"%.30s\" => ERROR: ",
          O2S(objPtr)), Tcl_GetObjResult(interp));
      goto checkForCatch;
  }
  objResultPtr = valuePtr;
  TRACE_WITH_OBJ(("\"%.30s\" => ", O2S(objPtr)), valuePtr);
  NEXT_INST_F(1, 1, -1); /* already has right refct */
 
    /*
     * ---------------------------------------------------------
     *     Start of INST_LOAD instructions.
     *
     * WARNING: more 'goto' here than your doctor recommended!
     * The different instructions set the value of some variables
     * and then jump to somme common execution code.
     */
 
    case INST_LOAD_SCALAR1:
  opnd = TclGetUInt1AtPtr(pc+1);
  varPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = varPtr->name;
  while (TclIsVarLink(varPtr)) {
      varPtr = varPtr->value.linkPtr;
  }
  TRACE(("%u => ", opnd));
  if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)
          && (varPtr->tracePtr == NULL)) {
      /*
       * No errors, no traces: just get the value.
       */
      objResultPtr = varPtr->value.objPtr;
      TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
      NEXT_INST_F(2, 0, 1);
  }
  pcAdjustment = 2;
  cleanup = 0;
  arrayPtr = NULL;
  part2 = NULL;
  goto doCallPtrGetVar;
 
    case INST_LOAD_SCALAR4:
  opnd = TclGetUInt4AtPtr(pc+1);
  varPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = varPtr->name;
  while (TclIsVarLink(varPtr)) {
      varPtr = varPtr->value.linkPtr;
  }
  TRACE(("%u => ", opnd));
  if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)
          && (varPtr->tracePtr == NULL)) {
      /*
       * No errors, no traces: just get the value.
       */
      objResultPtr = varPtr->value.objPtr;
      TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
      NEXT_INST_F(5, 0, 1);
  }
  pcAdjustment = 5;
  cleanup = 0;
  arrayPtr = NULL;
  part2 = NULL;
  goto doCallPtrGetVar;
 
    case INST_LOAD_ARRAY_STK:
  cleanup = 2;
  part2 = Tcl_GetString(stackPtr[stackTop]);  /* element name */
  objPtr = stackPtr[stackTop-1]; /* array name */
  TRACE(("\"%.30s(%.30s)\" => ", O2S(objPtr), part2));
  goto doLoadStk;
 
    case INST_LOAD_STK:
    case INST_LOAD_SCALAR_STK:
  cleanup = 1;
  part2 = NULL;
  objPtr = stackPtr[stackTop]; /* variable name */
  TRACE(("\"%.30s\" => ", O2S(objPtr)));
 
    doLoadStk:
  part1 = TclGetString(objPtr);
  varPtr = TclObjLookupVar(interp, objPtr, part2,
           TCL_LEAVE_ERR_MSG, "read",
                 /*createPart1*/ 0,
           /*createPart2*/ 1, &arrayPtr);
  if (varPtr == NULL) {
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)
          && (varPtr->tracePtr == NULL)
          && ((arrayPtr == NULL)
            || (arrayPtr->tracePtr == NULL))) {
      /*
       * No errors, no traces: just get the value.
       */
      objResultPtr = varPtr->value.objPtr;
      TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
      NEXT_INST_V(1, cleanup, 1);
  }
  pcAdjustment = 1;
  goto doCallPtrGetVar;
 
    case INST_LOAD_ARRAY4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  goto doLoadArray;
 
    case INST_LOAD_ARRAY1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
 
    doLoadArray:
  part2 = TclGetString(stackPtr[stackTop]);
  arrayPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = arrayPtr->name;
  while (TclIsVarLink(arrayPtr)) {
      arrayPtr = arrayPtr->value.linkPtr;
  }
  TRACE(("%u \"%.30s\" => ", opnd, part2));
  varPtr = TclLookupArrayElement(interp, part1, part2,
          TCL_LEAVE_ERR_MSG, "read", 0, 1, arrayPtr);
  if (varPtr == NULL) {
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)
          && (varPtr->tracePtr == NULL)
          && ((arrayPtr == NULL)
            || (arrayPtr->tracePtr == NULL))) {
      /*
       * No errors, no traces: just get the value.
       */
      objResultPtr = varPtr->value.objPtr;
      TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
      NEXT_INST_F(pcAdjustment, 1, 1);
  }
  cleanup = 1;
  goto doCallPtrGetVar;
 
    doCallPtrGetVar:
  /*
   * There are either errors or the variable is traced:
   * call TclPtrGetVar to process fully.
   */
 
  DECACHE_STACK_INFO();
  objResultPtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1,
          part2, TCL_LEAVE_ERR_MSG);
  CACHE_STACK_INFO();
  if (objResultPtr == NULL) {
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
  NEXT_INST_V(pcAdjustment, cleanup, 1);
 
    /*
     *     End of INST_LOAD instructions.
     * ---------------------------------------------------------
     */
 
    /*
     * ---------------------------------------------------------
     *     Start of INST_STORE and related instructions.
     *
     * WARNING: more 'goto' here than your doctor recommended!
     * The different instructions set the value of some variables
     * and then jump to somme common execution code.
     */
 
    case INST_LAPPEND_STK:
  valuePtr = stackPtr[stackTop]; /* value to append */
  part2 = NULL;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
          | TCL_LIST_ELEMENT | TCL_TRACE_READS);
  goto doStoreStk;
 
    case INST_LAPPEND_ARRAY_STK:
  valuePtr = stackPtr[stackTop]; /* value to append */
  part2 = TclGetString(stackPtr[stackTop - 1]);
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
          | TCL_LIST_ELEMENT | TCL_TRACE_READS);
  goto doStoreStk;
 
    case INST_APPEND_STK:
  valuePtr = stackPtr[stackTop]; /* value to append */
  part2 = NULL;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
  goto doStoreStk;
 
    case INST_APPEND_ARRAY_STK:
  valuePtr = stackPtr[stackTop]; /* value to append */
  part2 = TclGetString(stackPtr[stackTop - 1]);
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
  goto doStoreStk;
 
    case INST_STORE_ARRAY_STK:
  valuePtr = stackPtr[stackTop];
  part2 = TclGetString(stackPtr[stackTop - 1]);
  storeFlags = TCL_LEAVE_ERR_MSG;
  goto doStoreStk;
 
    case INST_STORE_STK:
    case INST_STORE_SCALAR_STK:
  valuePtr = stackPtr[stackTop];
  part2 = NULL;
  storeFlags = TCL_LEAVE_ERR_MSG;
 
    doStoreStk:
  objPtr = stackPtr[stackTop - 1 - (part2 != NULL)]; /* variable name */
  part1 = TclGetString(objPtr);
#ifdef TCL_COMPILE_DEBUG
  if (part2 == NULL) {
      TRACE(("\"%.30s\" <- \"%.30s\" =>",
              part1, O2S(valuePtr)));
  } else {
      TRACE(("\"%.30s(%.30s)\" <- \"%.30s\" => ",
        part1, part2, O2S(valuePtr)));
  }
#endif
  varPtr = TclObjLookupVar(interp, objPtr, part2,
           TCL_LEAVE_ERR_MSG, "set",
                 /*createPart1*/ 1,
           /*createPart2*/ 1, &arrayPtr);
  if (varPtr == NULL) {
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  cleanup = ((part2 == NULL)? 2 : 3);
  pcAdjustment = 1;
  goto doCallPtrSetVar;
 
    case INST_LAPPEND_ARRAY4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
          | TCL_LIST_ELEMENT | TCL_TRACE_READS);
  goto doStoreArray;
 
    case INST_LAPPEND_ARRAY1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
          | TCL_LIST_ELEMENT | TCL_TRACE_READS);
  goto doStoreArray;
 
    case INST_APPEND_ARRAY4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
  goto doStoreArray;
 
    case INST_APPEND_ARRAY1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
  goto doStoreArray;
 
    case INST_STORE_ARRAY4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  storeFlags = TCL_LEAVE_ERR_MSG;
  goto doStoreArray;
 
    case INST_STORE_ARRAY1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
  storeFlags = TCL_LEAVE_ERR_MSG;
 
    doStoreArray:
  valuePtr = stackPtr[stackTop];
  part2 = TclGetString(stackPtr[stackTop - 1]);
  arrayPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = arrayPtr->name;
  TRACE(("%u \"%.30s\" <- \"%.30s\" => ",
        opnd, part2, O2S(valuePtr)));
  while (TclIsVarLink(arrayPtr)) {
      arrayPtr = arrayPtr->value.linkPtr;
  }
  varPtr = TclLookupArrayElement(interp, part1, part2,
          TCL_LEAVE_ERR_MSG, "set", 1, 1, arrayPtr);
  if (varPtr == NULL) {
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  cleanup = 2;
  goto doCallPtrSetVar;
 
    case INST_LAPPEND_SCALAR4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
          | TCL_LIST_ELEMENT | TCL_TRACE_READS);
  goto doStoreScalar;
 
    case INST_LAPPEND_SCALAR1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE
          | TCL_LIST_ELEMENT | TCL_TRACE_READS);
  goto doStoreScalar;
 
    case INST_APPEND_SCALAR4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
  goto doStoreScalar;
 
    case INST_APPEND_SCALAR1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
  storeFlags = (TCL_LEAVE_ERR_MSG | TCL_APPEND_VALUE);
  goto doStoreScalar;
 
    case INST_STORE_SCALAR4:
  opnd = TclGetUInt4AtPtr(pc+1);
  pcAdjustment = 5;
  storeFlags = TCL_LEAVE_ERR_MSG;
  goto doStoreScalar;
 
    case INST_STORE_SCALAR1:
  opnd = TclGetUInt1AtPtr(pc+1);
  pcAdjustment = 2;
  storeFlags = TCL_LEAVE_ERR_MSG;
 
    doStoreScalar:
  valuePtr = stackPtr[stackTop];
  varPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = varPtr->name;
  TRACE(("%u <- \"%.30s\" => ", opnd, O2S(valuePtr)));
  while (TclIsVarLink(varPtr)) {
      varPtr = varPtr->value.linkPtr;
  }
  cleanup = 1;
  arrayPtr = NULL;
  part2 = NULL;
 
    doCallPtrSetVar:
  if ((storeFlags == TCL_LEAVE_ERR_MSG)
          && !((varPtr->flags & VAR_IN_HASHTABLE)
            && (varPtr->hPtr == NULL))
          && (varPtr->tracePtr == NULL)
          && (TclIsVarScalar(varPtr)
            || TclIsVarUndefined(varPtr))
          && ((arrayPtr == NULL)
            || (arrayPtr->tracePtr == NULL))) {
      /*
       * No traces, no errors, plain 'set': we can safely inline.
       * The value *will* be set to what's requested, so that
       * the stack top remains pointing to the same Tcl_Obj.
       */
      valuePtr = varPtr->value.objPtr;
      objResultPtr = stackPtr[stackTop];
      if (valuePtr != objResultPtr) {
    if (valuePtr != NULL) {
        TclDecrRefCount(valuePtr);
    } else {
        TclSetVarScalar(varPtr);
        TclClearVarUndefined(varPtr);
    }
    varPtr->value.objPtr = objResultPtr;
    Tcl_IncrRefCount(objResultPtr);
      }
#ifndef TCL_COMPILE_DEBUG
      if (*(pc+pcAdjustment) == INST_POP) {
    NEXT_INST_V((pcAdjustment+1), cleanup, 0);
      }
#else
  TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
#endif
      NEXT_INST_V(pcAdjustment, cleanup, 1);
  } else {
      DECACHE_STACK_INFO();
      objResultPtr = TclPtrSetVar(interp, varPtr, arrayPtr,
              part1, part2, valuePtr, storeFlags);
      CACHE_STACK_INFO();
      if (objResultPtr == NULL) {
    TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
    result = TCL_ERROR;
    goto checkForCatch;
      }
  }
#ifndef TCL_COMPILE_DEBUG
  if (*(pc+pcAdjustment) == INST_POP) {
      NEXT_INST_V((pcAdjustment+1), cleanup, 0);
  }
#endif
  TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
  NEXT_INST_V(pcAdjustment, cleanup, 1);
 
 
    /*
     *     End of INST_STORE and related instructions.
     * ---------------------------------------------------------
     */
 
    /*
     * ---------------------------------------------------------
     *     Start of INST_INCR instructions.
     *
     * WARNING: more 'goto' here than your doctor recommended!
     * The different instructions set the value of some variables
     * and then jump to somme common execution code.
     */
 
    case INST_INCR_SCALAR1:
    case INST_INCR_ARRAY1:
    case INST_INCR_ARRAY_STK:
    case INST_INCR_SCALAR_STK:
    case INST_INCR_STK:
  opnd = TclGetUInt1AtPtr(pc+1);
  valuePtr = stackPtr[stackTop];
  if (valuePtr->typePtr == &tclIntType) {
      i = valuePtr->internalRep.longValue;
  } else if (valuePtr->typePtr == &tclWideIntType) {
      TclGetLongFromWide(i,valuePtr);
  } else {
      REQUIRE_WIDE_OR_INT(result, valuePtr, i, w);
      if (result != TCL_OK) {
    TRACE_WITH_OBJ(("%u (by %s) => ERROR converting increment amount to int: ",
            opnd, O2S(valuePtr)), Tcl_GetObjResult(interp));
    DECACHE_STACK_INFO();
    Tcl_AddErrorInfo(interp, "\n    (reading increment)");
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
      FORCE_LONG(valuePtr, i, w);
  }
  stackTop--;
  TclDecrRefCount(valuePtr);
  switch (*pc) {
      case INST_INCR_SCALAR1:
    pcAdjustment = 2;
    goto doIncrScalar;
      case INST_INCR_ARRAY1:
    pcAdjustment = 2;
    goto doIncrArray;
      default:
    pcAdjustment = 1;
    goto doIncrStk;
  }
 
    case INST_INCR_ARRAY_STK_IMM:
    case INST_INCR_SCALAR_STK_IMM:
    case INST_INCR_STK_IMM:
  i = TclGetInt1AtPtr(pc+1);
  pcAdjustment = 2;
 
    doIncrStk:
  if ((*pc == INST_INCR_ARRAY_STK_IMM)
          || (*pc == INST_INCR_ARRAY_STK)) {
      part2 = TclGetString(stackPtr[stackTop]);
      objPtr = stackPtr[stackTop - 1];
      TRACE(("\"%.30s(%.30s)\" (by %ld) => ",
        O2S(objPtr), part2, i));
  } else {
      part2 = NULL;
      objPtr = stackPtr[stackTop];
      TRACE(("\"%.30s\" (by %ld) => ", O2S(objPtr), i));
  }
  part1 = TclGetString(objPtr);
 
  varPtr = TclObjLookupVar(interp, objPtr, part2,
          TCL_LEAVE_ERR_MSG, "read", 0, 1, &arrayPtr);
  if (varPtr == NULL) {
      DECACHE_STACK_INFO();
      Tcl_AddObjErrorInfo(interp,
              "\n    (reading value of variable to increment)", -1);
      CACHE_STACK_INFO();
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  cleanup = ((part2 == NULL)? 1 : 2);
  goto doIncrVar;
 
    case INST_INCR_ARRAY1_IMM:
  opnd = TclGetUInt1AtPtr(pc+1);
  i = TclGetInt1AtPtr(pc+2);
  pcAdjustment = 3;
 
    doIncrArray:
  part2 = TclGetString(stackPtr[stackTop]);
  arrayPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = arrayPtr->name;
  while (TclIsVarLink(arrayPtr)) {
      arrayPtr = arrayPtr->value.linkPtr;
  }
  TRACE(("%u \"%.30s\" (by %ld) => ",
        opnd, part2, i));
  varPtr = TclLookupArrayElement(interp, part1, part2,
          TCL_LEAVE_ERR_MSG, "read", 0, 1, arrayPtr);
  if (varPtr == NULL) {
      TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
      result = TCL_ERROR;
      goto checkForCatch;
  }
  cleanup = 1;
  goto doIncrVar;
 
    case INST_INCR_SCALAR1_IMM:
  opnd = TclGetUInt1AtPtr(pc+1);
  i = TclGetInt1AtPtr(pc+2);
  pcAdjustment = 3;
 
    doIncrScalar:
  varPtr = &(varFramePtr->compiledLocals[opnd]);
  part1 = varPtr->name;
  while (TclIsVarLink(varPtr)) {
      varPtr = varPtr->value.linkPtr;
  }
  arrayPtr = NULL;
  part2 = NULL;
  cleanup = 0;
  TRACE(("%u %ld => ", opnd, i));
 
 
    doIncrVar:
  objPtr = varPtr->value.objPtr;
  if (TclIsVarScalar(varPtr)
          && !TclIsVarUndefined(varPtr)
          && (varPtr->tracePtr == NULL)
          && ((arrayPtr == NULL)
            || (arrayPtr->tracePtr == NULL))
          && (objPtr->typePtr == &tclIntType)) {
      /*
       * No errors, no traces, the variable already has an
       * integer value: inline processing.
       */
 
      i += objPtr->internalRep.longValue;
      if (Tcl_IsShared(objPtr)) {
    objResultPtr = Tcl_NewLongObj(i);
    TclDecrRefCount(objPtr);
    Tcl_IncrRefCount(objResultPtr);
    varPtr->value.objPtr = objResultPtr;
      } else {
    Tcl_SetLongObj(objPtr, i);
    objResultPtr = objPtr;
      }
      TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
  } else {
      DECACHE_STACK_INFO();
      objResultPtr = TclPtrIncrVar(interp, varPtr, arrayPtr, part1,
                    part2, i, TCL_LEAVE_ERR_MSG);
      CACHE_STACK_INFO();
      if (objResultPtr == NULL) {
    TRACE_APPEND(("ERROR: %.30s\n", O2S(Tcl_GetObjResult(interp))));
    result = TCL_ERROR;
    goto checkForCatch;
      }
  }
  TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
#ifndef TCL_COMPILE_DEBUG
  if (*(pc+pcAdjustment) == INST_POP) {
      NEXT_INST_V((pcAdjustment+1), cleanup, 0);
  }
#endif
  NEXT_INST_V(pcAdjustment, cleanup, 1);
 
    /*
     *     End of INST_INCR instructions.
     * ---------------------------------------------------------
     */
 
 
    case INST_JUMP1:
  opnd = TclGetInt1AtPtr(pc+1);
  TRACE(("%d => new pc %u\n", opnd,
          (unsigned int)(pc + opnd - codePtr->codeStart)));
  NEXT_INST_F(opnd, 0, 0);
 
    case INST_JUMP4:
  opnd = TclGetInt4AtPtr(pc+1);
  TRACE(("%d => new pc %u\n", opnd,
          (unsigned int)(pc + opnd - codePtr->codeStart)));
  NEXT_INST_F(opnd, 0, 0);
 
    case INST_JUMP_FALSE4:
  opnd = 5;                             /* TRUE */
  pcAdjustment = TclGetInt4AtPtr(pc+1); /* FALSE */
  goto doJumpTrue;
 
    case INST_JUMP_TRUE4:
  opnd = TclGetInt4AtPtr(pc+1);         /* TRUE */
  pcAdjustment = 5;                     /* FALSE */
  goto doJumpTrue;
 
    case INST_JUMP_FALSE1:
  opnd = 2;                             /* TRUE */
  pcAdjustment = TclGetInt1AtPtr(pc+1); /* FALSE */
  goto doJumpTrue;
 
    case INST_JUMP_TRUE1:
  opnd = TclGetInt1AtPtr(pc+1);          /* TRUE */
  pcAdjustment = 2;                      /* FALSE */
 
    doJumpTrue:
  {
      int b;
 
      valuePtr = stackPtr[stackTop];
      if (valuePtr->typePtr == &tclIntType) {
    b = (valuePtr->internalRep.longValue != 0);
      } else if (valuePtr->typePtr == &tclDoubleType) {
    b = (valuePtr->internalRep.doubleValue != 0.0);
      } else if (valuePtr->typePtr == &tclWideIntType) {
    TclGetWide(w,valuePtr);
    b = (w != W0);
      } else {
    result = Tcl_GetBooleanFromObj(interp, valuePtr, &b);
    if (result != TCL_OK) {
        TRACE_WITH_OBJ(("%d => ERROR: ", opnd), Tcl_GetObjResult(interp));
        goto checkForCatch;
    }
      }
#ifndef TCL_COMPILE_DEBUG
      NEXT_INST_F((b? opnd : pcAdjustment), 1, 0);
#else
      if (b) {
    if ((*pc == INST_JUMP_TRUE1) || (*pc == INST_JUMP_TRUE1)) {
        TRACE(("%d => %.20s true, new pc %u\n", opnd, O2S(valuePtr),
                (unsigned int)(pc+opnd - codePtr->codeStart)));
    } else {
        TRACE(("%d => %.20s true\n", pcAdjustment, O2S(valuePtr)));
    }
    NEXT_INST_F(opnd, 1, 0);
      } else {
    if ((*pc == INST_JUMP_TRUE1) || (*pc == INST_JUMP_TRUE1)) {
        TRACE(("%d => %.20s false\n", opnd, O2S(valuePtr)));
    } else {
        opnd = pcAdjustment;
        TRACE(("%d => %.20s false, new pc %u\n", opnd, O2S(valuePtr),
                (unsigned int)(pc + opnd - codePtr->codeStart)));
    }
    NEXT_INST_F(pcAdjustment, 1, 0);
      }
#endif
  }
 
    case INST_LOR:
    case INST_LAND:
    {
  /*
   * Operands must be boolean or numeric. No int->double
   * conversions are performed.
   */
 
  int i1, i2;
  int iResult;
  char *s;
  Tcl_ObjType *t1Ptr, *t2Ptr;
 
  value2Ptr = stackPtr[stackTop];
  valuePtr  = stackPtr[stackTop - 1];;
  t1Ptr = valuePtr->typePtr;
  t2Ptr = value2Ptr->typePtr;
 
  if ((t1Ptr == &tclIntType) || (t1Ptr == &tclBooleanType)) {
      i1 = (valuePtr->internalRep.longValue != 0);
  } else if (t1Ptr == &tclWideIntType) {
      TclGetWide(w,valuePtr);
      i1 = (w != W0);
  } else if (t1Ptr == &tclDoubleType) {
      i1 = (valuePtr->internalRep.doubleValue != 0.0);
  } else {
      s = Tcl_GetStringFromObj(valuePtr, &length);
      if (TclLooksLikeInt(s, length)) {
    GET_WIDE_OR_INT(result, valuePtr, i, w);
    if (valuePtr->typePtr == &tclIntType) {
        i1 = (i != 0);
    } else {
        i1 = (w != W0);
    }
      } else {
    result = Tcl_GetBooleanFromObj((Tcl_Interp *) NULL,
                 valuePtr, &i1);
    i1 = (i1 != 0);
      }
      if (result != TCL_OK) {
    TRACE(("\"%.20s\" => ILLEGAL TYPE %s \n", O2S(valuePtr),
            (t1Ptr? t1Ptr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, valuePtr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
  }
 
  if ((t2Ptr == &tclIntType) || (t2Ptr == &tclBooleanType)) {
      i2 = (value2Ptr->internalRep.longValue != 0);
  } else if (t2Ptr == &tclWideIntType) {
      TclGetWide(w,value2Ptr);
      i2 = (w != W0);
  } else if (t2Ptr == &tclDoubleType) {
      i2 = (value2Ptr->internalRep.doubleValue != 0.0);
  } else {
      s = Tcl_GetStringFromObj(value2Ptr, &length);
      if (TclLooksLikeInt(s, length)) {
    GET_WIDE_OR_INT(result, value2Ptr, i, w);
    if (value2Ptr->typePtr == &tclIntType) {
        i2 = (i != 0);
    } else {
        i2 = (w != W0);
    }
      } else {
    result = Tcl_GetBooleanFromObj((Tcl_Interp *) NULL, value2Ptr, &i2);
      }
      if (result != TCL_OK) {
    TRACE(("\"%.20s\" => ILLEGAL TYPE %s \n", O2S(value2Ptr),
            (t2Ptr? t2Ptr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, value2Ptr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
  }
 
  /*
   * Reuse the valuePtr object already on stack if possible.
   */
 
  if (*pc == INST_LOR) {
      iResult = (i1 || i2);
  } else {
      iResult = (i1 && i2);
  }
  if (Tcl_IsShared(valuePtr)) {
      objResultPtr = Tcl_NewLongObj(iResult);
      TRACE(("%.20s %.20s => %d\n", O2S(valuePtr), O2S(value2Ptr), iResult));
      NEXT_INST_F(1, 2, 1);
  } else {  /* reuse the valuePtr object */
      TRACE(("%.20s %.20s => %d\n", O2S(valuePtr), O2S(value2Ptr), iResult));
      Tcl_SetLongObj(valuePtr, iResult);
      NEXT_INST_F(1, 1, 0);
  }
    }
 
    /*
     * ---------------------------------------------------------
     *     Start of INST_LIST and related instructions.
     */
 
    case INST_LIST:
  /*
   * Pop the opnd (objc) top stack elements into a new list obj
   * and then decrement their ref counts.
   */
 
  opnd = TclGetUInt4AtPtr(pc+1);
  objResultPtr = Tcl_NewListObj(opnd, &(stackPtr[stackTop - (opnd-1)]));
  TRACE_WITH_OBJ(("%u => ", opnd), objResultPtr);
  NEXT_INST_V(5, opnd, 1);
 
    case INST_LIST_LENGTH:
  valuePtr = stackPtr[stackTop];
 
  result = Tcl_ListObjLength(interp, valuePtr, &length);
  if (result != TCL_OK) {
      TRACE_WITH_OBJ(("%.30s => ERROR: ", O2S(valuePtr)),
              Tcl_GetObjResult(interp));
      goto checkForCatch;
  }
  objResultPtr = Tcl_NewIntObj(length);
  TRACE(("%.20s => %d\n", O2S(valuePtr), length));
  NEXT_INST_F(1, 1, 1);
 
    case INST_LIST_INDEX:
  /*** lindex with objc == 3 ***/
 
  /*
   * Pop the two operands
   */
  value2Ptr = stackPtr[stackTop];
  valuePtr  = stackPtr[stackTop- 1];
 
  /*
   * Extract the desired list element
   */
  objResultPtr = TclLindexList(interp, valuePtr, value2Ptr);
  if (objResultPtr == NULL) {
      TRACE_WITH_OBJ(("%.30s %.30s => ERROR: ", O2S(valuePtr), O2S(value2Ptr)),
              Tcl_GetObjResult(interp));
      result = TCL_ERROR;
      goto checkForCatch;
  }
 
  /*
   * Stash the list element on the stack
   */
  TRACE(("%.20s %.20s => %s\n",
          O2S(valuePtr), O2S(value2Ptr), O2S(objResultPtr)));
  NEXT_INST_F(1, 2, -1); /* already has the correct refCount */
 
    case INST_LIST_INDEX_MULTI:
    {
  /*
   * 'lindex' with multiple index args:
   *
   * Determine the count of index args.
   */
 
  int numIdx;
 
  opnd = TclGetUInt4AtPtr(pc+1);
  numIdx = opnd-1;
 
  /*
   * Do the 'lindex' operation.
   */
  objResultPtr = TclLindexFlat(interp, stackPtr[stackTop - numIdx],
          numIdx, stackPtr + stackTop - numIdx + 1);
 
  /*
   * Check for errors
   */
  if (objResultPtr == NULL) {
      TRACE_WITH_OBJ(("%d => ERROR: ", opnd), Tcl_GetObjResult(interp));
      result = TCL_ERROR;
      goto checkForCatch;
  }
 
  /*
   * Set result
   */
  TRACE(("%d => %s\n", opnd, O2S(objResultPtr)));
  NEXT_INST_V(5, opnd, -1);
    }
 
    case INST_LSET_FLAT:
    {
  /*
   * Lset with 3, 5, or more args.  Get the number
   * of index args.
   */
  int numIdx;
 
  opnd = TclGetUInt4AtPtr( pc + 1 );
  numIdx = opnd - 2;
 
  /*
   * Get the old value of variable, and remove the stack ref.
   * This is safe because the variable still references the
   * object; the ref count will never go zero here.
   */
  value2Ptr = POP_OBJECT();
  TclDecrRefCount(value2Ptr); /* This one should be done here */
 
  /*
   * Get the new element value.
   */
  valuePtr = stackPtr[stackTop];
 
  /*
   * Compute the new variable value
   */
  objResultPtr = TclLsetFlat(interp, value2Ptr, numIdx,
          stackPtr + stackTop - numIdx, valuePtr);
 
 
  /*
   * Check for errors
   */
  if (objResultPtr == NULL) {
      TRACE_WITH_OBJ(("%d => ERROR: ", opnd), Tcl_GetObjResult(interp));
      result = TCL_ERROR;
      goto checkForCatch;
  }
 
  /*
   * Set result
   */
  TRACE(("%d => %s\n", opnd, O2S(objResultPtr)));
  NEXT_INST_V(5, (numIdx+1), -1);
    }
 
    case INST_LSET_LIST:
  /*
   * 'lset' with 4 args.
   *
   * Get the old value of variable, and remove the stack ref.
   * This is safe because the variable still references the
   * object; the ref count will never go zero here.
   */
  objPtr = POP_OBJECT();
  TclDecrRefCount(objPtr); /* This one should be done here */
 
  /*
   * Get the new element value, and the index list
   */
  valuePtr = stackPtr[stackTop];
  value2Ptr = stackPtr[stackTop - 1];
 
  /*
   * Compute the new variable value
   */
  objResultPtr = TclLsetList(interp, objPtr, value2Ptr, valuePtr);
 
  /*
   * Check for errors
   */
  if (objResultPtr == NULL) {
      TRACE_WITH_OBJ(("\"%.30s\" => ERROR: ", O2S(value2Ptr)),
              Tcl_GetObjResult(interp));
      result = TCL_ERROR;
      goto checkForCatch;
  }
 
  /*
   * Set result
   */
  TRACE(("=> %s\n", O2S(objResultPtr)));
  NEXT_INST_F(1, 2, -1);
 
    /*
     *     End of INST_LIST and related instructions.
     * ---------------------------------------------------------
     */
 
    case INST_STR_EQ:
    case INST_STR_NEQ:
    {
  /*
   * String (in)equality check
   */
  int iResult;
 
  value2Ptr = stackPtr[stackTop];
  valuePtr = stackPtr[stackTop - 1];
 
  if (valuePtr == value2Ptr) {
      /*
       * On the off-chance that the objects are the same,
       * we don't really have to think hard about equality.
       */
      iResult = (*pc == INST_STR_EQ);
  } else {
      char *s1, *s2;
      int s1len, s2len;
 
      s1 = Tcl_GetStringFromObj(valuePtr, &s1len);
      s2 = Tcl_GetStringFromObj(value2Ptr, &s2len);
      if (s1len == s2len) {
    /*
     * We only need to check (in)equality when
     * we have equal length strings.
     */
    if (*pc == INST_STR_NEQ) {
        iResult = (strcmp(s1, s2) != 0);
    } else {
        /* INST_STR_EQ */
        iResult = (strcmp(s1, s2) == 0);
    }
      } else {
    iResult = (*pc == INST_STR_NEQ);
      }
  }
 
  TRACE(("%.20s %.20s => %d\n", O2S(valuePtr), O2S(value2Ptr), iResult));
 
  /*
   * Peep-hole optimisation: if you're about to jump, do jump
   * from here.
   */
 
  pc++;
#ifndef TCL_COMPILE_DEBUG
  switch (*pc) {
      case INST_JUMP_FALSE1:
    NEXT_INST_F((iResult? 2 : TclGetInt1AtPtr(pc+1)), 2, 0);
      case INST_JUMP_TRUE1:
    NEXT_INST_F((iResult? TclGetInt1AtPtr(pc+1) : 2), 2, 0);
      case INST_JUMP_FALSE4:
    NEXT_INST_F((iResult? 5 : TclGetInt4AtPtr(pc+1)), 2, 0);
      case INST_JUMP_TRUE4:
    NEXT_INST_F((iResult? TclGetInt4AtPtr(pc+1) : 5), 2, 0);
  }
#endif
  objResultPtr = Tcl_NewIntObj(iResult);
  NEXT_INST_F(0, 2, 1);
    }
 
    case INST_STR_CMP:
    {
  /*
   * String compare
   */
  CONST char *s1, *s2;
  int s1len, s2len, iResult;
 
  value2Ptr = stackPtr[stackTop];
  valuePtr = stackPtr[stackTop - 1];
 
  /*
   * The comparison function should compare up to the
   * minimum byte length only.
   */
  if (valuePtr == value2Ptr) {
      /*
       * In the pure equality case, set lengths too for
       * the checks below (or we could goto beyond it).
       */
      iResult = s1len = s2len = 0;
  } else if ((valuePtr->typePtr == &tclByteArrayType)
          && (value2Ptr->typePtr == &tclByteArrayType)) {
      s1 = (char *) Tcl_GetByteArrayFromObj(valuePtr, &s1len);
      s2 = (char *) Tcl_GetByteArrayFromObj(value2Ptr, &s2len);
      iResult = memcmp(s1, s2,
              (size_t) ((s1len < s2len) ? s1len : s2len));
  } else if (((valuePtr->typePtr == &tclStringType)
          && (value2Ptr->typePtr == &tclStringType))) {
      /*
       * Do a unicode-specific comparison if both of the args are of
       * String type.  If the char length == byte length, we can do a
       * memcmp.  In benchmark testing this proved the most efficient
       * check between the unicode and string comparison operations.
       */
 
      s1len = Tcl_GetCharLength(valuePtr);
      s2len = Tcl_GetCharLength(value2Ptr);
      if ((s1len == valuePtr->length) && (s2len == value2Ptr->length)) {
    iResult = memcmp(valuePtr->bytes, value2Ptr->bytes,
      (unsigned) ((s1len < s2len) ? s1len : s2len));
      } else {
    iResult = TclUniCharNcmp(Tcl_GetUnicode(valuePtr),
      Tcl_GetUnicode(value2Ptr),
      (unsigned) ((s1len < s2len) ? s1len : s2len));
      }
  } else {
      /*
       * We can't do a simple memcmp in order to handle the
       * special Tcl \xC0\x80 null encoding for utf-8.
       */
      s1 = Tcl_GetStringFromObj(valuePtr, &s1len);
      s2 = Tcl_GetStringFromObj(value2Ptr, &s2len);
      iResult = TclpUtfNcmp2(s1, s2,
              (size_t) ((s1len < s2len) ? s1len : s2len));
  }
 
  /*
   * Make sure only -1,0,1 is returned
   */
  if (iResult == 0) {
      iResult = s1len - s2len;
  }
  if (iResult < 0) {
      iResult = -1;
  } else if (iResult > 0) {
      iResult = 1;
  }
 
  objResultPtr = Tcl_NewIntObj(iResult);
  TRACE(("%.20s %.20s => %d\n", O2S(valuePtr), O2S(value2Ptr), iResult));
  NEXT_INST_F(1, 2, 1);
    }
 
    case INST_STR_LEN:
    {
  int length1;
 
  valuePtr = stackPtr[stackTop];
 
  if (valuePtr->typePtr == &tclByteArrayType) {
      (void) Tcl_GetByteArrayFromObj(valuePtr, &length1);
  } else {
      length1 = Tcl_GetCharLength(valuePtr);
  }
  objResultPtr = Tcl_NewIntObj(length1);
  TRACE(("%.20s => %d\n", O2S(valuePtr), length1));
  NEXT_INST_F(1, 1, 1);
    }
 
    case INST_STR_INDEX:
    {
  /*
   * String compare
   */
  int index;
  bytes = NULL; /* lint */
 
  value2Ptr = stackPtr[stackTop];
  valuePtr = stackPtr[stackTop - 1];
 
  /*
   * If we have a ByteArray object, avoid indexing in the
   * Utf string since the byte array contains one byte per
   * character.  Otherwise, use the Unicode string rep to
   * get the index'th char.
   */
 
  if (valuePtr->typePtr == &tclByteArrayType) {
      bytes = (char *)Tcl_GetByteArrayFromObj(valuePtr, &length);
  } else {
      /*
       * Get Unicode char length to calulate what 'end' means.
       */
      length = Tcl_GetCharLength(valuePtr);
  }
 
  result = TclGetIntForIndex(interp, value2Ptr, length - 1, &index);
  if (result != TCL_OK) {
      goto checkForCatch;
  }
 
  if ((index >= 0) && (index < length)) {
      if (valuePtr->typePtr == &tclByteArrayType) {
    objResultPtr = Tcl_NewByteArrayObj((unsigned char *)
            (&bytes[index]), 1);
      } else if (valuePtr->bytes && length == valuePtr->length) {
    objResultPtr = Tcl_NewStringObj((CONST char *)
            (&valuePtr->bytes[index]), 1);
      } else {
    char buf[TCL_UTF_MAX];
    Tcl_UniChar ch;
 
    ch = Tcl_GetUniChar(valuePtr, index);
    /*
     * This could be:
     * Tcl_NewUnicodeObj((CONST Tcl_UniChar *)&ch, 1)
     * but creating the object as a string seems to be
     * faster in practical use.
     */
    length = Tcl_UniCharToUtf(ch, buf);
    objResultPtr = Tcl_NewStringObj(buf, length);
      }
  } else {
      TclNewObj(objResultPtr);
  }
 
  TRACE(("%.20s %.20s => %s\n", O2S(valuePtr), O2S(value2Ptr),
          O2S(objResultPtr)));
  NEXT_INST_F(1, 2, 1);
    }
 
    case INST_STR_MATCH:
    {
  int nocase, match;
 
  nocase    = TclGetInt1AtPtr(pc+1);
  valuePtr  = stackPtr[stackTop];         /* String */
  value2Ptr = stackPtr[stackTop - 1]; /* Pattern */
 
  /*
   * Check that at least one of the objects is Unicode before
   * promoting both.
   */
 
  if ((valuePtr->typePtr == &tclStringType)
          || (value2Ptr->typePtr == &tclStringType)) {
      Tcl_UniChar *ustring1, *ustring2;
      int length1, length2;
 
      ustring1 = Tcl_GetUnicodeFromObj(valuePtr, &length1);
      ustring2 = Tcl_GetUnicodeFromObj(value2Ptr, &length2);
      match = TclUniCharMatch(ustring1, length1, ustring2, length2,
        nocase);
  } else {
      match = Tcl_StringCaseMatch(TclGetString(valuePtr),
        TclGetString(value2Ptr), nocase);
  }
 
  /*
   * Reuse value2Ptr object already on stack if possible.
   * Adjustment is 2 due to the nocase byte
   */
 
  TRACE(("%.20s %.20s => %d\n", O2S(valuePtr), O2S(value2Ptr), match));
  if (Tcl_IsShared(value2Ptr)) {
      objResultPtr = Tcl_NewIntObj(match);
      NEXT_INST_F(2, 2, 1);
  } else {  /* reuse the valuePtr object */
      Tcl_SetIntObj(value2Ptr, match);
      NEXT_INST_F(2, 1, 0);
  }
    }
 
    case INST_EQ:
    case INST_NEQ:
    case INST_LT:
    case INST_GT:
    case INST_LE:
    case INST_GE:
    {
  /*
   * Any type is allowed but the two operands must have the
   * same type. We will compute value op value2.
   */
 
  Tcl_ObjType *t1Ptr, *t2Ptr;
  char *s1 = NULL;  /* Init. avoids compiler warning. */
  char *s2 = NULL;  /* Init. avoids compiler warning. */
  long i2 = 0;    /* Init. avoids compiler warning. */
  double d1 = 0.0;  /* Init. avoids compiler warning. */
  double d2 = 0.0;  /* Init. avoids compiler warning. */
  long iResult = 0; /* Init. avoids compiler warning. */
 
  value2Ptr = stackPtr[stackTop];
  valuePtr  = stackPtr[stackTop - 1];
 
  /*
   * Be careful in the equal-object case; 'NaN' isn't supposed
   * to be equal to even itself. [Bug 761471]
   */
 
  t1Ptr = valuePtr->typePtr;
  if (valuePtr == value2Ptr) {
      /*
       * If we are numeric already, we can proceed to the main
       * equality check right now.  Otherwise, we need to try to
       * coerce to a numeric type so we can see if we've got a
       * NaN but haven't parsed it as numeric.
       */
      if (!IS_NUMERIC_TYPE(t1Ptr)) {
    if (t1Ptr == &tclListType) {
        int length;
        /*
         * Only a list of length 1 can be NaN or such
         * things.
         */
        (void) Tcl_ListObjLength(NULL, valuePtr, &length);
        if (length == 1) {
      goto mustConvertForNaNCheck;
        }
    } else {
        /*
         * Too bad, we'll have to compute the string and
         * try the conversion
         */
 
      mustConvertForNaNCheck:
        s1 = Tcl_GetStringFromObj(valuePtr, &length);
        if (TclLooksLikeInt(s1, length)) {
      GET_WIDE_OR_INT(iResult, valuePtr, i, w);
        } else {
      (void) Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
        valuePtr, &d1);
        }
        t1Ptr = valuePtr->typePtr;
    }
      }
 
      switch (*pc) {
      case INST_EQ:
      case INST_LE:
      case INST_GE:
    iResult = !((t1Ptr == &tclDoubleType)
      && IS_NAN(valuePtr->internalRep.doubleValue));
    break;
      case INST_LT:
      case INST_GT:
    iResult = 0;
    break;
      case INST_NEQ:
    iResult = ((t1Ptr == &tclDoubleType)
      && IS_NAN(valuePtr->internalRep.doubleValue));
    break;
      }
      goto foundResult;
  }
 
  t2Ptr = value2Ptr->typePtr;
 
  /*
   * We only want to coerce numeric validation if neither type
   * is NULL.  A NULL type means the arg is essentially an empty
   * object ("", {} or [list]).
   */
  if (!(     (!t1Ptr && !valuePtr->bytes)
          || (valuePtr->bytes && !valuePtr->length)
       || (!t2Ptr && !value2Ptr->bytes)
       || (value2Ptr->bytes && !value2Ptr->length))) {
      if (!IS_NUMERIC_TYPE(t1Ptr)) {
    s1 = Tcl_GetStringFromObj(valuePtr, &length);
    if (TclLooksLikeInt(s1, length)) {
        GET_WIDE_OR_INT(iResult, valuePtr, i, w);
    } else {
        (void) Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
                valuePtr, &d1);
    }
    t1Ptr = valuePtr->typePtr;
      }
      if (!IS_NUMERIC_TYPE(t2Ptr)) {
    s2 = Tcl_GetStringFromObj(value2Ptr, &length);
    if (TclLooksLikeInt(s2, length)) {
        GET_WIDE_OR_INT(iResult, value2Ptr, i2, w);
    } else {
        (void) Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
                value2Ptr, &d2);
    }
    t2Ptr = value2Ptr->typePtr;
      }
  }
  if (!IS_NUMERIC_TYPE(t1Ptr) || !IS_NUMERIC_TYPE(t2Ptr)) {
      /*
       * One operand is not numeric. Compare as strings.  NOTE:
       * strcmp is not correct for \x00 < \x01, but that is
       * unlikely to occur here.  We could use the TclUtfNCmp2
       * to handle this.
       */
      int s1len, s2len;
      s1 = Tcl_GetStringFromObj(valuePtr, &s1len);
      s2 = Tcl_GetStringFromObj(value2Ptr, &s2len);
      switch (*pc) {
          case INST_EQ:
        if (s1len == s2len) {
      iResult = (strcmp(s1, s2) == 0);
        } else {
      iResult = 0;
        }
        break;
          case INST_NEQ:
        if (s1len == s2len) {
      iResult = (strcmp(s1, s2) != 0);
        } else {
      iResult = 1;
        }
        break;
          case INST_LT:
        iResult = (strcmp(s1, s2) < 0);
        break;
          case INST_GT:
        iResult = (strcmp(s1, s2) > 0);
        break;
          case INST_LE:
        iResult = (strcmp(s1, s2) <= 0);
        break;
          case INST_GE:
        iResult = (strcmp(s1, s2) >= 0);
        break;
      }
  } else if ((t1Ptr == &tclDoubleType)
       || (t2Ptr == &tclDoubleType)) {
      /*
       * Compare as doubles.
       */
      if (t1Ptr == &tclDoubleType) {
    d1 = valuePtr->internalRep.doubleValue;
    GET_DOUBLE_VALUE(d2, value2Ptr, t2Ptr);
      } else {  /* t1Ptr is integer, t2Ptr is double */
    GET_DOUBLE_VALUE(d1, valuePtr, t1Ptr);
    d2 = value2Ptr->internalRep.doubleValue;
      }
      switch (*pc) {
          case INST_EQ:
        iResult = d1 == d2;
        break;
          case INST_NEQ:
        iResult = d1 != d2;
        break;
          case INST_LT:
        iResult = d1 < d2;
        break;
          case INST_GT:
        iResult = d1 > d2;
        break;
          case INST_LE:
        iResult = d1 <= d2;
        break;
          case INST_GE:
        iResult = d1 >= d2;
        break;
      }
  } else if ((t1Ptr == &tclWideIntType)
          || (t2Ptr == &tclWideIntType)) {
      Tcl_WideInt w2;
      /*
       * Compare as wide ints (neither are doubles)
       */
      if (t1Ptr == &tclIntType) {
    w  = Tcl_LongAsWide(valuePtr->internalRep.longValue);
    TclGetWide(w2,value2Ptr);
      } else if (t2Ptr == &tclIntType) {
    TclGetWide(w,valuePtr);
    w2 = Tcl_LongAsWide(value2Ptr->internalRep.longValue);
      } else {
    TclGetWide(w,valuePtr);
    TclGetWide(w2,value2Ptr);
      }
      switch (*pc) {
          case INST_EQ:
        iResult = w == w2;
        break;
          case INST_NEQ:
        iResult = w != w2;
        break;
          case INST_LT:
        iResult = w < w2;
        break;
          case INST_GT:
        iResult = w > w2;
        break;
          case INST_LE:
        iResult = w <= w2;
        break;
          case INST_GE:
        iResult = w >= w2;
        break;
      }
  } else {
      /*
       * Compare as ints.
       */
      i  = valuePtr->internalRep.longValue;
      i2 = value2Ptr->internalRep.longValue;
      switch (*pc) {
          case INST_EQ:
        iResult = i == i2;
        break;
          case INST_NEQ:
        iResult = i != i2;
        break;
          case INST_LT:
        iResult = i < i2;
        break;
          case INST_GT:
        iResult = i > i2;
        break;
          case INST_LE:
        iResult = i <= i2;
        break;
          case INST_GE:
        iResult = i >= i2;
        break;
      }
  }
 
    foundResult:
  TRACE(("%.20s %.20s => %ld\n", O2S(valuePtr), O2S(value2Ptr), iResult));
 
  /*
   * Peep-hole optimisation: if you're about to jump, do jump
   * from here.
   */
 
  pc++;
#ifndef TCL_COMPILE_DEBUG
  switch (*pc) {
      case INST_JUMP_FALSE1:
    NEXT_INST_F((iResult? 2 : TclGetInt1AtPtr(pc+1)), 2, 0);
      case INST_JUMP_TRUE1:
    NEXT_INST_F((iResult? TclGetInt1AtPtr(pc+1) : 2), 2, 0);
      case INST_JUMP_FALSE4:
    NEXT_INST_F((iResult? 5 : TclGetInt4AtPtr(pc+1)), 2, 0);
      case INST_JUMP_TRUE4:
    NEXT_INST_F((iResult? TclGetInt4AtPtr(pc+1) : 5), 2, 0);
  }
#endif
  objResultPtr = Tcl_NewIntObj(iResult);
  NEXT_INST_F(0, 2, 1);
    }
 
    case INST_MOD:
    case INST_LSHIFT:
    case INST_RSHIFT:
    case INST_BITOR:
    case INST_BITXOR:
    case INST_BITAND:
    {
  /*
   * Only integers are allowed. We compute value op value2.
   */
 
  long i2 = 0, rem, negative;
  long iResult = 0; /* Init. avoids compiler warning. */
  Tcl_WideInt w2, wResult = W0;
  int doWide = 0;
 
  value2Ptr = stackPtr[stackTop];
  valuePtr  = stackPtr[stackTop - 1];
  if (valuePtr->typePtr == &tclIntType) {
      i = valuePtr->internalRep.longValue;
  } else if (valuePtr->typePtr == &tclWideIntType) {
      TclGetWide(w,valuePtr);
  } else {  /* try to convert to int */
      REQUIRE_WIDE_OR_INT(result, valuePtr, i, w);
      if (result != TCL_OK) {
    TRACE(("%.20s %.20s => ILLEGAL 1st TYPE %s\n",
            O2S(valuePtr), O2S(value2Ptr),
            (valuePtr->typePtr?
           valuePtr->typePtr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, valuePtr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
  }
  if (value2Ptr->typePtr == &tclIntType) {
      i2 = value2Ptr->internalRep.longValue;
  } else if (value2Ptr->typePtr == &tclWideIntType) {
      TclGetWide(w2,value2Ptr);
  } else {
      REQUIRE_WIDE_OR_INT(result, value2Ptr, i2, w2);
      if (result != TCL_OK) {
    TRACE(("%.20s %.20s => ILLEGAL 2nd TYPE %s\n",
            O2S(valuePtr), O2S(value2Ptr),
            (value2Ptr->typePtr?
          value2Ptr->typePtr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, value2Ptr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
  }
 
  switch (*pc) {
  case INST_MOD:
      /*
       * This code is tricky: C doesn't guarantee much about
       * the quotient or remainder, but Tcl does. The
       * remainder always has the same sign as the divisor and
       * a smaller absolute value.
       */
      if (value2Ptr->typePtr == &tclWideIntType && w2 == W0) {
    if (valuePtr->typePtr == &tclIntType) {
        TRACE(("%ld "LLD" => DIVIDE BY ZERO\n", i, w2));
    } else {
        TRACE((LLD" "LLD" => DIVIDE BY ZERO\n", w, w2));
    }
    goto divideByZero;
      }
      if (value2Ptr->typePtr == &tclIntType && i2 == 0) {
    if (valuePtr->typePtr == &tclIntType) {
        TRACE(("%ld %ld => DIVIDE BY ZERO\n", i, i2));
    } else {
        TRACE((LLD" %ld => DIVIDE BY ZERO\n", w, i2));
    }
    goto divideByZero;
      }
      negative = 0;
      if (valuePtr->typePtr == &tclWideIntType
    || value2Ptr->typePtr == &tclWideIntType) {
    Tcl_WideInt wRemainder;
    /*
     * Promote to wide
     */
    if (valuePtr->typePtr == &tclIntType) {
        w = Tcl_LongAsWide(i);
    } else if (value2Ptr->typePtr == &tclIntType) {
        w2 = Tcl_LongAsWide(i2);
    }
    if (w2 < 0) {
        w2 = -w2;
        w = -w;
        negative = 1;
    }
    wRemainder  = w % w2;
    if (wRemainder < 0) {
        wRemainder += w2;
    }
    if (negative) {
        wRemainder = -wRemainder;
    }
    wResult = wRemainder;
    doWide = 1;
    break;
      }
      if (i2 < 0) {
    i2 = -i2;
    i = -i;
    negative = 1;
      }
      rem  = i % i2;
      if (rem < 0) {
    rem += i2;
      }
      if (negative) {
    rem = -rem;
      }
      iResult = rem;
      break;
  case INST_LSHIFT:
      /*
       * Shifts are never usefully 64-bits wide!
       */
      FORCE_LONG(value2Ptr, i2, w2);
      if (valuePtr->typePtr == &tclWideIntType) {
#ifdef TCL_COMPILE_DEBUG
    w2 = Tcl_LongAsWide(i2);
#endif /* TCL_COMPILE_DEBUG */
    wResult = w;
    /*
     * Shift in steps when the shift gets large to prevent
     * annoying compiler/processor bugs. [Bug 868467]
     */
    if (i2 >= 64) {
        wResult = Tcl_LongAsWide(0);
    } else if (i2 > 60) {
        wResult = w << 30;
        wResult <<= 30;
        wResult <<= i2-60;
    } else if (i2 > 30) {
        wResult = w << 30;
        wResult <<= i2-30;
    } else {
        wResult = w << i2;
    }
    doWide = 1;
    break;
      }
      /*
       * Shift in steps when the shift gets large to prevent
       * annoying compiler/processor bugs. [Bug 868467]
       */
      if (i2 >= 64) {
    iResult = 0;
      } else if (i2 > 60) {
    iResult = i << 30;
    iResult <<= 30;
    iResult <<= i2-60;
      } else if (i2 > 30) {
    iResult = i << 30;
    iResult <<= i2-30;
      } else {
    iResult = i << i2;
      }
      break;
  case INST_RSHIFT:
      /*
       * The following code is a bit tricky: it ensures that
       * right shifts propagate the sign bit even on machines
       * where ">>" won't do it by default.
       */
      /*
       * Shifts are never usefully 64-bits wide!
       */
      FORCE_LONG(value2Ptr, i2, w2);
      if (valuePtr->typePtr == &tclWideIntType) {
#ifdef TCL_COMPILE_DEBUG
    w2 = Tcl_LongAsWide(i2);
#endif /* TCL_COMPILE_DEBUG */
    if (w < 0) {
        wResult = ~w;
    } else {
        wResult = w;
    }
    /*
     * Shift in steps when the shift gets large to prevent
     * annoying compiler/processor bugs. [Bug 868467]
     */
    if (i2 >= 64) {
        wResult = Tcl_LongAsWide(0);
    } else if (i2 > 60) {
        wResult >>= 30;
        wResult >>= 30;
        wResult >>= i2-60;
    } else if (i2 > 30) {
        wResult >>= 30;
        wResult >>= i2-30;
    } else {
        wResult >>= i2;
    }
    if (w < 0) {
        wResult = ~wResult;
    }
    doWide = 1;
    break;
      }
      if (i < 0) {
    iResult = ~i;
      } else {
    iResult = i;
      }
      /*
       * Shift in steps when the shift gets large to prevent
       * annoying compiler/processor bugs. [Bug 868467]
       */
      if (i2 >= 64) {
    iResult = 0;
      } else if (i2 > 60) {
    iResult >>= 30;
    iResult >>= 30;
    iResult >>= i2-60;
      } else if (i2 > 30) {
    iResult >>= 30;
    iResult >>= i2-30;
      } else {
    iResult >>= i2;
      }
      if (i < 0) {
    iResult = ~iResult;
      }
      break;
  case INST_BITOR:
      if (valuePtr->typePtr == &tclWideIntType
    || value2Ptr->typePtr == &tclWideIntType) {
    /*
     * Promote to wide
     */
    if (valuePtr->typePtr == &tclIntType) {
        w = Tcl_LongAsWide(i);
    } else if (value2Ptr->typePtr == &tclIntType) {
        w2 = Tcl_LongAsWide(i2);
    }
    wResult = w | w2;
    doWide = 1;
    break;
      }
      iResult = i | i2;
      break;
  case INST_BITXOR:
      if (valuePtr->typePtr == &tclWideIntType
    || value2Ptr->typePtr == &tclWideIntType) {
    /*
     * Promote to wide
     */
    if (valuePtr->typePtr == &tclIntType) {
        w = Tcl_LongAsWide(i);
    } else if (value2Ptr->typePtr == &tclIntType) {
        w2 = Tcl_LongAsWide(i2);
    }
    wResult = w ^ w2;
    doWide = 1;
    break;
      }
      iResult = i ^ i2;
      break;
  case INST_BITAND:
      if (valuePtr->typePtr == &tclWideIntType
    || value2Ptr->typePtr == &tclWideIntType) {
    /*
     * Promote to wide
     */
    if (valuePtr->typePtr == &tclIntType) {
        w = Tcl_LongAsWide(i);
    } else if (value2Ptr->typePtr == &tclIntType) {
        w2 = Tcl_LongAsWide(i2);
    }
    wResult = w & w2;
    doWide = 1;
    break;
      }
      iResult = i & i2;
      break;
  }
 
  /*
   * Reuse the valuePtr object already on stack if possible.
   */
 
  if (Tcl_IsShared(valuePtr)) {
      if (doWide) {
    objResultPtr = Tcl_NewWideIntObj(wResult);
    TRACE((LLD" "LLD" => "LLD"\n", w, w2, wResult));
      } else {
    objResultPtr = Tcl_NewLongObj(iResult);
    TRACE(("%ld %ld => %ld\n", i, i2, iResult));
      }
      NEXT_INST_F(1, 2, 1);
  } else {  /* reuse the valuePtr object */
      if (doWide) {
    TRACE((LLD" "LLD" => "LLD"\n", w, w2, wResult));
    Tcl_SetWideIntObj(valuePtr, wResult);
      } else {
    TRACE(("%ld %ld => %ld\n", i, i2, iResult));
    Tcl_SetLongObj(valuePtr, iResult);
      }
      NEXT_INST_F(1, 1, 0);
  }
    }
 
    case INST_ADD:
    case INST_SUB:
    case INST_MULT:
    case INST_DIV:
    {
  /*
   * Operands must be numeric and ints get converted to floats
   * if necessary. We compute value op value2.
   */
 
  Tcl_ObjType *t1Ptr, *t2Ptr;
  long i2 = 0, quot, rem; /* Init. avoids compiler warning. */
  double d1, d2;
  long iResult = 0; /* Init. avoids compiler warning. */
  double dResult = 0.0; /* Init. avoids compiler warning. */
  int doDouble = 0; /* 1 if doing floating arithmetic */
  Tcl_WideInt w2, wquot, wrem;
  Tcl_WideInt wResult = W0; /* Init. avoids compiler warning. */
  int doWide = 0;   /* 1 if doing wide arithmetic. */
 
  value2Ptr = stackPtr[stackTop];
  valuePtr  = stackPtr[stackTop - 1];
  t1Ptr = valuePtr->typePtr;
  t2Ptr = value2Ptr->typePtr;
 
  if (t1Ptr == &tclIntType) {
      i = valuePtr->internalRep.longValue;
  } else if (t1Ptr == &tclWideIntType) {
      TclGetWide(w,valuePtr);
  } else if ((t1Ptr == &tclDoubleType)
       && (valuePtr->bytes == NULL)) {
      /*
       * We can only use the internal rep directly if there is
       * no string rep.  Otherwise the string rep might actually
       * look like an integer, which is preferred.
       */
 
      d1 = valuePtr->internalRep.doubleValue;
  } else {
      char *s = Tcl_GetStringFromObj(valuePtr, &length);
      if (TclLooksLikeInt(s, length)) {
    GET_WIDE_OR_INT(result, valuePtr, i, w);
      } else {
    result = Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
                valuePtr, &d1);
      }
      if (result != TCL_OK) {
    TRACE(("%.20s %.20s => ILLEGAL 1st TYPE %s\n",
            s, O2S(valuePtr),
            (valuePtr->typePtr?
          valuePtr->typePtr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, valuePtr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
      t1Ptr = valuePtr->typePtr;
  }
 
  if (t2Ptr == &tclIntType) {
      i2 = value2Ptr->internalRep.longValue;
  } else if (t2Ptr == &tclWideIntType) {
      TclGetWide(w2,value2Ptr);
  } else if ((t2Ptr == &tclDoubleType)
       && (value2Ptr->bytes == NULL)) {
      /*
       * We can only use the internal rep directly if there is
       * no string rep.  Otherwise the string rep might actually
       * look like an integer, which is preferred.
       */
 
      d2 = value2Ptr->internalRep.doubleValue;
  } else {
      char *s = Tcl_GetStringFromObj(value2Ptr, &length);
      if (TclLooksLikeInt(s, length)) {
    GET_WIDE_OR_INT(result, value2Ptr, i2, w2);
      } else {
    result = Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
            value2Ptr, &d2);
      }
      if (result != TCL_OK) {
    TRACE(("%.20s %.20s => ILLEGAL 2nd TYPE %s\n",
            O2S(value2Ptr), s,
            (value2Ptr->typePtr?
          value2Ptr->typePtr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, value2Ptr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
      t2Ptr = value2Ptr->typePtr;
  }
 
  if ((t1Ptr == &tclDoubleType) || (t2Ptr == &tclDoubleType)) {
      /*
       * Do double arithmetic.
       */
      doDouble = 1;
      if (t1Ptr == &tclIntType) {
    d1 = i;       /* promote value 1 to double */
      } else if (t2Ptr == &tclIntType) {
    d2 = i2;      /* promote value 2 to double */
      } else if (t1Ptr == &tclWideIntType) {
    d1 = Tcl_WideAsDouble(w);
      } else if (t2Ptr == &tclWideIntType) {
    d2 = Tcl_WideAsDouble(w2);
      }
      switch (*pc) {
          case INST_ADD:
        dResult = d1 + d2;
        break;
          case INST_SUB:
        dResult = d1 - d2;
        break;
          case INST_MULT:
        dResult = d1 * d2;
        break;
          case INST_DIV:
        if (d2 == 0.0) {
      TRACE(("%.6g %.6g => DIVIDE BY ZERO\n", d1, d2));
      goto divideByZero;
        }
        dResult = d1 / d2;
        break;
      }
 
      /*
       * Check now for IEEE floating-point error.
       */
 
      if (IS_NAN(dResult) || IS_INF(dResult)) {
    TRACE(("%.20s %.20s => IEEE FLOATING PT ERROR\n",
            O2S(valuePtr), O2S(value2Ptr)));
    DECACHE_STACK_INFO();
    TclExprFloatError(interp, dResult);
    CACHE_STACK_INFO();
    result = TCL_ERROR;
    goto checkForCatch;
      }
  } else if ((t1Ptr == &tclWideIntType)
       || (t2Ptr == &tclWideIntType)) {
      /*
       * Do wide integer arithmetic.
       */
      doWide = 1;
      if (t1Ptr == &tclIntType) {
    w = Tcl_LongAsWide(i);
      } else if (t2Ptr == &tclIntType) {
    w2 = Tcl_LongAsWide(i2);
      }
      switch (*pc) {
          case INST_ADD:
        wResult = w + w2;
        break;
          case INST_SUB:
        wResult = w - w2;
        break;
          case INST_MULT:
        wResult = w * w2;
        break;
          case INST_DIV:
        /*
         * This code is tricky: C doesn't guarantee much
         * about the quotient or remainder, but Tcl does.
         * The remainder always has the same sign as the
         * divisor and a smaller absolute value.
         */
        if (w2 == W0) {
      TRACE((LLD" "LLD" => DIVIDE BY ZERO\n", w, w2));
      goto divideByZero;
        }
        if (w2 < 0) {
      w2 = -w2;
      w = -w;
        }
        wquot = w / w2;
        wrem  = w % w2;
        if (wrem < W0) {
      wquot -= 1;
        }
        wResult = wquot;
        break;
      }
  } else {
      /*
         * Do integer arithmetic.
         */
      switch (*pc) {
          case INST_ADD:
        iResult = i + i2;
        break;
          case INST_SUB:
        iResult = i - i2;
        break;
          case INST_MULT:
        iResult = i * i2;
        break;
          case INST_DIV:
        /*
         * This code is tricky: C doesn't guarantee much
         * about the quotient or remainder, but Tcl does.
         * The remainder always has the same sign as the
         * divisor and a smaller absolute value.
         */
        if (i2 == 0) {
      TRACE(("%ld %ld => DIVIDE BY ZERO\n", i, i2));
      goto divideByZero;
        }
        if (i2 < 0) {
      i2 = -i2;
      i = -i;
        }
        quot = i / i2;
        rem  = i % i2;
        if (rem < 0) {
      quot -= 1;
        }
        iResult = quot;
        break;
      }
  }
 
  /*
   * Reuse the valuePtr object already on stack if possible.
   */
 
  if (Tcl_IsShared(valuePtr)) {
      if (doDouble) {
    objResultPtr = Tcl_NewDoubleObj(dResult);
    TRACE(("%.6g %.6g => %.6g\n", d1, d2, dResult));
      } else if (doWide) {
    objResultPtr = Tcl_NewWideIntObj(wResult);
    TRACE((LLD" "LLD" => "LLD"\n", w, w2, wResult));
      } else {
    objResultPtr = Tcl_NewLongObj(iResult);
    TRACE(("%ld %ld => %ld\n", i, i2, iResult));
      }
      NEXT_INST_F(1, 2, 1);
  } else {      /* reuse the valuePtr object */
      if (doDouble) { /* NB: stack top is off by 1 */
    TRACE(("%.6g %.6g => %.6g\n", d1, d2, dResult));
    Tcl_SetDoubleObj(valuePtr, dResult);
      } else if (doWide) {
    TRACE((LLD" "LLD" => "LLD"\n", w, w2, wResult));
    Tcl_SetWideIntObj(valuePtr, wResult);
      } else {
    TRACE(("%ld %ld => %ld\n", i, i2, iResult));
    Tcl_SetLongObj(valuePtr, iResult);
      }
      NEXT_INST_F(1, 1, 0);
  }
    }
 
    case INST_UPLUS:
    {
  /*
   * Operand must be numeric.
   */
 
  double d;
  Tcl_ObjType *tPtr;
 
  valuePtr = stackPtr[stackTop];
  tPtr = valuePtr->typePtr;
  if (!IS_INTEGER_TYPE(tPtr) && ((tPtr != &tclDoubleType)
                || (valuePtr->bytes != NULL))) {
      char *s = Tcl_GetStringFromObj(valuePtr, &length);
      if (TclLooksLikeInt(s, length)) {
    GET_WIDE_OR_INT(result, valuePtr, i, w);
      } else {
    result = Tcl_GetDoubleFromObj((Tcl_Interp *) NULL, valuePtr, &d);
      }
      if (result != TCL_OK) {
    TRACE(("\"%.20s\" => ILLEGAL TYPE %s \n",
            s, (tPtr? tPtr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, valuePtr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
      tPtr = valuePtr->typePtr;
  }
 
  /*
   * Ensure that the operand's string rep is the same as the
   * formatted version of its internal rep. This makes sure
   * that "expr +000123" yields "83", not "000123". We
   * implement this by _discarding_ the string rep since we
   * know it will be regenerated, if needed later, by
   * formatting the internal rep's value.
   */
 
  if (Tcl_IsShared(valuePtr)) {
      if (tPtr == &tclIntType) {
    i = valuePtr->internalRep.longValue;
    objResultPtr = Tcl_NewLongObj(i);
      } else if (tPtr == &tclWideIntType) {
    TclGetWide(w,valuePtr);
    objResultPtr = Tcl_NewWideIntObj(w);
      } else {
    d = valuePtr->internalRep.doubleValue;
    objResultPtr = Tcl_NewDoubleObj(d);
      }
      TRACE_WITH_OBJ(("%s => ", O2S(objResultPtr)), objResultPtr);
      NEXT_INST_F(1, 1, 1);
  } else {
      Tcl_InvalidateStringRep(valuePtr);
      TRACE_WITH_OBJ(("%s => ", O2S(valuePtr)), valuePtr);
      NEXT_INST_F(1, 0, 0);
  }
    }
 
    case INST_UMINUS:
    case INST_LNOT:
    {
  /*
   * The operand must be numeric or a boolean string as
   * accepted by Tcl_GetBooleanFromObj(). If the operand
   * object is unshared modify it directly, otherwise
   * create a copy to modify: this is "copy on write".
   * Free any old string representation since it is now
   * invalid.
   */
 
  double d;
  int boolvar;
  Tcl_ObjType *tPtr;
 
  valuePtr = stackPtr[stackTop];
  tPtr = valuePtr->typePtr;
  if (!IS_INTEGER_TYPE(tPtr) && ((tPtr != &tclDoubleType)
          || (valuePtr->bytes != NULL))) {
      if ((tPtr == &tclBooleanType) && (valuePtr->bytes == NULL)) {
    valuePtr->typePtr = &tclIntType;
      } else {
    char *s = Tcl_GetStringFromObj(valuePtr, &length);
    if (TclLooksLikeInt(s, length)) {
        GET_WIDE_OR_INT(result, valuePtr, i, w);
    } else {
        result = Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
                valuePtr, &d);
    }
    if (result == TCL_ERROR && *pc == INST_LNOT) {
        result = Tcl_GetBooleanFromObj((Tcl_Interp *)NULL,
                valuePtr, &boolvar);
        i = (long)boolvar; /* i is long, not int! */
    }
    if (result != TCL_OK) {
        TRACE(("\"%.20s\" => ILLEGAL TYPE %s\n",
                s, (tPtr? tPtr->name : "null")));
        DECACHE_STACK_INFO();
        IllegalExprOperandType(interp, pc, valuePtr);
        CACHE_STACK_INFO();
        goto checkForCatch;
    }
      }
      tPtr = valuePtr->typePtr;
  }
 
  if (Tcl_IsShared(valuePtr)) {
      /*
       * Create a new object.
       */
      if ((tPtr == &tclIntType) || (tPtr == &tclBooleanType)) {
    i = valuePtr->internalRep.longValue;
    objResultPtr = Tcl_NewLongObj(
        (*pc == INST_UMINUS)? -i : !i);
    TRACE_WITH_OBJ(("%ld => ", i), objResultPtr);
      } else if (tPtr == &tclWideIntType) {
    TclGetWide(w,valuePtr);
    if (*pc == INST_UMINUS) {
        objResultPtr = Tcl_NewWideIntObj(-w);
    } else {
        objResultPtr = Tcl_NewLongObj(w == W0);
    }
    TRACE_WITH_OBJ((LLD" => ", w), objResultPtr);
      } else {
    d = valuePtr->internalRep.doubleValue;
    if (*pc == INST_UMINUS) {
        objResultPtr = Tcl_NewDoubleObj(-d);
    } else {
        /*
         * Should be able to use "!d", but apparently
         * some compilers can't handle it.
         */
        objResultPtr = Tcl_NewLongObj((d==0.0)? 1 : 0);
    }
    TRACE_WITH_OBJ(("%.6g => ", d), objResultPtr);
      }
      NEXT_INST_F(1, 1, 1);
  } else {
      /*
       * valuePtr is unshared. Modify it directly.
       */
      if ((tPtr == &tclIntType) || (tPtr == &tclBooleanType)) {
    i = valuePtr->internalRep.longValue;
    Tcl_SetLongObj(valuePtr,
                  (*pc == INST_UMINUS)? -i : !i);
    TRACE_WITH_OBJ(("%ld => ", i), valuePtr);
      } else if (tPtr == &tclWideIntType) {
    TclGetWide(w,valuePtr);
    if (*pc == INST_UMINUS) {
        Tcl_SetWideIntObj(valuePtr, -w);
    } else {
        Tcl_SetLongObj(valuePtr, w == W0);
    }
    TRACE_WITH_OBJ((LLD" => ", w), valuePtr);
      } else {
    d = valuePtr->internalRep.doubleValue;
    if (*pc == INST_UMINUS) {
        Tcl_SetDoubleObj(valuePtr, -d);
    } else {
        /*
         * Should be able to use "!d", but apparently
         * some compilers can't handle it.
         */
        Tcl_SetLongObj(valuePtr, (d==0.0)? 1 : 0);
    }
    TRACE_WITH_OBJ(("%.6g => ", d), valuePtr);
      }
      NEXT_INST_F(1, 0, 0);
  }
    }
 
    case INST_BITNOT:
    {
  /*
   * The operand must be an integer. If the operand object is
   * unshared modify it directly, otherwise modify a copy.
   * Free any old string representation since it is now
   * invalid.
   */
 
  Tcl_ObjType *tPtr;
 
  valuePtr = stackPtr[stackTop];
  tPtr = valuePtr->typePtr;
  if (!IS_INTEGER_TYPE(tPtr)) {
      REQUIRE_WIDE_OR_INT(result, valuePtr, i, w);
      if (result != TCL_OK) {   /* try to convert to double */
    TRACE(("\"%.20s\" => ILLEGAL TYPE %s\n",
            O2S(valuePtr), (tPtr? tPtr->name : "null")));
    DECACHE_STACK_INFO();
    IllegalExprOperandType(interp, pc, valuePtr);
    CACHE_STACK_INFO();
    goto checkForCatch;
      }
  }
 
  if (valuePtr->typePtr == &tclWideIntType) {
      TclGetWide(w,valuePtr);
      if (Tcl_IsShared(valuePtr)) {
    objResultPtr = Tcl_NewWideIntObj(~w);
    TRACE(("0x%llx => (%llu)\n", w, ~w));
    NEXT_INST_F(1, 1, 1);
      } else {
    /*
     * valuePtr is unshared. Modify it directly.
     */
    Tcl_SetWideIntObj(valuePtr, ~w);
    TRACE(("0x%llx => (%llu)\n", w, ~w));
    NEXT_INST_F(1, 0, 0);
      }
  } else {
      i = valuePtr->internalRep.longValue;
      if (Tcl_IsShared(valuePtr)) {
    objResultPtr = Tcl_NewLongObj(~i);
    TRACE(("0x%lx => (%lu)\n", i, ~i));
    NEXT_INST_F(1, 1, 1);
      } else {
    /*
     * valuePtr is unshared. Modify it directly.
     */
    Tcl_SetLongObj(valuePtr, ~i);
    TRACE(("0x%lx => (%lu)\n", i, ~i));
    NEXT_INST_F(1, 0, 0);
      }
  }
    }
 
    case INST_CALL_BUILTIN_FUNC1:
  opnd = TclGetUInt1AtPtr(pc+1);
  {
      /*
       * Call one of the built-in Tcl math functions.
       */
 
      BuiltinFunc *mathFuncPtr;
 
      if ((opnd < 0) || (opnd > LAST_BUILTIN_FUNC)) {
    TRACE(("UNRECOGNIZED BUILTIN FUNC CODE %d\n", opnd));
    panic("TclExecuteByteCode: unrecognized builtin function code %d", opnd);
      }
      mathFuncPtr = &(tclBuiltinFuncTable[opnd]);
      DECACHE_STACK_INFO();
      result = (*mathFuncPtr->proc)(interp, eePtr,
              mathFuncPtr->clientData);
      CACHE_STACK_INFO();
      if (result != TCL_OK) {
    goto checkForCatch;
      }
      TRACE_WITH_OBJ(("%d => ", opnd), stackPtr[stackTop]);
  }
  NEXT_INST_F(2, 0, 0);
 
    case INST_CALL_FUNC1:
  opnd = TclGetUInt1AtPtr(pc+1);
  {
      /*
       * Call a non-builtin Tcl math function previously
       * registered by a call to Tcl_CreateMathFunc.
       */
 
      int objc = opnd;   /* Number of arguments. The function name
        * is the 0-th argument. */
      Tcl_Obj **objv;    /* The array of arguments. The function
        * name is objv[0]. */
 
      objv = &(stackPtr[stackTop - (objc-1)]); /* "objv[0]" */
      DECACHE_STACK_INFO();
      result = ExprCallMathFunc(interp, eePtr, objc, objv);
      CACHE_STACK_INFO();
      if (result != TCL_OK) {
    goto checkForCatch;
      }
      TRACE_WITH_OBJ(("%d => ", objc), stackPtr[stackTop]);
  }
  NEXT_INST_F(2, 0, 0);
 
    case INST_TRY_CVT_TO_NUMERIC:
    {
  /*
   * Try to convert the topmost stack object to an int or
   * double object. This is done in order to support Tcl's
   * policy of interpreting operands if at all possible as
   * first integers, else floating-point numbers.
   */
 
  double d;
  char *s;
  Tcl_ObjType *tPtr;
  int converted, needNew;
 
  valuePtr = stackPtr[stackTop];
  tPtr = valuePtr->typePtr;
  converted = 0;
  if (!IS_INTEGER_TYPE(tPtr) && ((tPtr != &tclDoubleType)
          || (valuePtr->bytes != NULL))) {
      if ((tPtr == &tclBooleanType) && (valuePtr->bytes == NULL)) {
    valuePtr->typePtr = &tclIntType;
    converted = 1;
      } else {
    s = Tcl_GetStringFromObj(valuePtr, &length);
    if (TclLooksLikeInt(s, length)) {
        GET_WIDE_OR_INT(result, valuePtr, i, w);
    } else {
        result = Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,
                valuePtr, &d);
    }
    if (result == TCL_OK) {
        converted = 1;
    }
    result = TCL_OK; /* reset the result variable */
      }
      tPtr = valuePtr->typePtr;
  }
 
  /*
   * Ensure that the topmost stack object, if numeric, has a
   * string rep the same as the formatted version of its
   * internal rep. This is used, e.g., to make sure that "expr
   * {0001}" yields "1", not "0001". We implement this by
   * _discarding_ the string rep since we know it will be
   * regenerated, if needed later, by formatting the internal
   * rep's value. Also check if there has been an IEEE
   * floating point error.
   */
 
  objResultPtr = valuePtr;
  needNew = 0;
  if (IS_NUMERIC_TYPE(tPtr)) {
      if (Tcl_IsShared(valuePtr)) {
    if (valuePtr->bytes != NULL) {
        /*
         * We only need to make a copy of the object
         * when it already had a string rep
         */
        needNew = 1;
        if (tPtr == &tclIntType) {
      i = valuePtr->internalRep.longValue;
      objResultPtr = Tcl_NewLongObj(i);
        } else if (tPtr == &tclWideIntType) {
      TclGetWide(w,valuePtr);
      objResultPtr = Tcl_NewWideIntObj(w);
        } else {
      d = valuePtr->internalRep.doubleValue;
      objResultPtr = Tcl_NewDoubleObj(d);
        }
        tPtr = objResultPtr->typePtr;
    }
      } else {
    Tcl_InvalidateStringRep(valuePtr);
      }
 
      if (tPtr == &tclDoubleType) {
    d = objResultPtr->internalRep.doubleValue;
    if (IS_NAN(d) || IS_INF(d)) {
        TRACE(("\"%.20s\" => IEEE FLOATING PT ERROR\n",
                O2S(objResultPtr)));
        DECACHE_STACK_INFO();
        TclExprFloatError(interp, d);
        CACHE_STACK_INFO();
        result = TCL_ERROR;
        goto checkForCatch;
    }
      }
      converted = converted;  /* lint, converted not used. */
      TRACE(("\"%.20s\" => numeric, %s, %s\n", O2S(valuePtr),
              (converted? "converted" : "not converted"),
        (needNew? "new Tcl_Obj" : "same Tcl_Obj")));
  } else {
      TRACE(("\"%.20s\" => not numeric\n", O2S(valuePtr)));
  }
  if (needNew) {
      NEXT_INST_F(1, 1, 1);
  } else {
      NEXT_INST_F(1, 0, 0);
  }
    }
 
    case INST_BREAK:
  DECACHE_STACK_INFO();
  Tcl_ResetResult(interp);
  CACHE_STACK_INFO();
  result = TCL_BREAK;
  cleanup = 0;
  goto processExceptionReturn;
 
    case INST_CONTINUE:
  DECACHE_STACK_INFO();
  Tcl_ResetResult(interp);
  CACHE_STACK_INFO();
  result = TCL_CONTINUE;
  cleanup = 0;
  goto processExceptionReturn;
 
    case INST_FOREACH_START4:
  opnd = TclGetUInt4AtPtr(pc+1);
  {
      /*
       * Initialize the temporary local var that holds the count
       * of the number of iterations of the loop body to -1.
       */
 
      ForeachInfo *infoPtr = (ForeachInfo *)
              codePtr->auxDataArrayPtr[opnd].clientData;
      int iterTmpIndex = infoPtr->loopCtTemp;
      Var *compiledLocals = iPtr->varFramePtr->compiledLocals;
      Var *iterVarPtr = &(compiledLocals[iterTmpIndex]);
      Tcl_Obj *oldValuePtr = iterVarPtr->value.objPtr;
 
      if (oldValuePtr == NULL) {
    iterVarPtr->value.objPtr = Tcl_NewLongObj(-1);
    Tcl_IncrRefCount(iterVarPtr->value.objPtr);
      } else {
    Tcl_SetLongObj(oldValuePtr, -1);
      }
      TclSetVarScalar(iterVarPtr);
      TclClearVarUndefined(iterVarPtr);
      TRACE(("%u => loop iter count temp %d\n",
       opnd, iterTmpIndex));
  }
 
#ifndef TCL_COMPILE_DEBUG
  /*
   * Remark that the compiler ALWAYS sets INST_FOREACH_STEP4
   * immediately after INST_FOREACH_START4 - let us just fall
   * through instead of jumping back to the top.
   */
 
  pc += 5;
#else
  NEXT_INST_F(5, 0, 0);
#endif
    case INST_FOREACH_STEP4:
  opnd = TclGetUInt4AtPtr(pc+1);
  {
      /*
       * "Step" a foreach loop (i.e., begin its next iteration) by
       * assigning the next value list element to each loop var.
       */
 
      ForeachInfo *infoPtr = (ForeachInfo *)
              codePtr->auxDataArrayPtr[opnd].clientData;
      ForeachVarList *varListPtr;
      int numLists = infoPtr->numLists;
      Var *compiledLocals = iPtr->varFramePtr->compiledLocals;
      Tcl_Obj *listPtr;
      List *listRepPtr;
      Var *iterVarPtr, *listVarPtr;
      int iterNum, listTmpIndex, listLen, numVars;
      int varIndex, valIndex, continueLoop, j;
 
      /*
       * Increment the temp holding the loop iteration number.
       */
 
      iterVarPtr = &(compiledLocals[infoPtr->loopCtTemp]);
      valuePtr = iterVarPtr->value.objPtr;
      iterNum = (valuePtr->internalRep.longValue + 1);
      Tcl_SetLongObj(valuePtr, iterNum);
 
      /*
       * Check whether all value lists are exhausted and we should
       * stop the loop.
       */
 
      continueLoop = 0;
      listTmpIndex = infoPtr->firstValueTemp;
      for (i = 0;  i < numLists;  i++) {
    varListPtr = infoPtr->varLists[i];
    numVars = varListPtr->numVars;
 
    listVarPtr = &(compiledLocals[listTmpIndex]);
    listPtr = listVarPtr->value.objPtr;
    result = Tcl_ListObjLength(interp, listPtr, &listLen);
    if (result != TCL_OK) {
        TRACE_WITH_OBJ(("%u => ERROR converting list %ld, \"%s\": ",
                opnd, i, O2S(listPtr)), Tcl_GetObjResult(interp));
        goto checkForCatch;
    }
    if (listLen > (iterNum * numVars)) {
        continueLoop = 1;
    }
    listTmpIndex++;
      }
 
      /*
       * If some var in some var list still has a remaining list
       * element iterate one more time. Assign to var the next
       * element from its value list. We already checked above
       * that each list temp holds a valid list object.
       */
 
      if (continueLoop) {
    listTmpIndex = infoPtr->firstValueTemp;
    for (i = 0;  i < numLists;  i++) {
        varListPtr = infoPtr->varLists[i];
        numVars = varListPtr->numVars;
 
        listVarPtr = &(compiledLocals[listTmpIndex]);
        listPtr = listVarPtr->value.objPtr;
        listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1;
        listLen = listRepPtr->elemCount;
 
        valIndex = (iterNum * numVars);
        for (j = 0;  j < numVars;  j++) {
      if (valIndex >= listLen) {
          TclNewObj(valuePtr);
      } else {
          valuePtr = listRepPtr->elements[valIndex];
      }
 
      varIndex = varListPtr->varIndexes[j];
      varPtr = &(varFramePtr->compiledLocals[varIndex]);
      part1 = varPtr->name;
      while (TclIsVarLink(varPtr)) {
          varPtr = varPtr->value.linkPtr;
      }
      if (!((varPtr->flags & VAR_IN_HASHTABLE) && (varPtr->hPtr == NULL))
              && (varPtr->tracePtr == NULL)
              && (TclIsVarScalar(varPtr) || TclIsVarUndefined(varPtr))) {
          value2Ptr = varPtr->value.objPtr;
          if (valuePtr != value2Ptr) {
        if (value2Ptr != NULL) {
            TclDecrRefCount(value2Ptr);
        } else {
            TclSetVarScalar(varPtr);
            TclClearVarUndefined(varPtr);
        }
        varPtr->value.objPtr = valuePtr;
        Tcl_IncrRefCount(valuePtr);
          }
      } else {
          DECACHE_STACK_INFO();
          Tcl_IncrRefCount(valuePtr);
          value2Ptr = TclPtrSetVar(interp, varPtr, NULL, part1,
                 NULL, valuePtr, TCL_LEAVE_ERR_MSG);
          TclDecrRefCount(valuePtr);
          CACHE_STACK_INFO();
          if (value2Ptr == NULL) {
        TRACE_WITH_OBJ(("%u => ERROR init. index temp %d: ",
            opnd, varIndex),
                 Tcl_GetObjResult(interp));
        result = TCL_ERROR;
        goto checkForCatch;
          }
      }
      valIndex++;
        }
        listTmpIndex++;
    }
      }
      TRACE(("%u => %d lists, iter %d, %s loop\n", opnd, numLists,
              iterNum, (continueLoop? "continue" : "exit")));
 
      /*
       * Run-time peep-hole optimisation: the compiler ALWAYS follows
       * INST_FOREACH_STEP4 with an INST_JUMP_FALSE. We just skip that
       * instruction and jump direct from here.
       */
 
      pc += 5;
      if (*pc == INST_JUMP_FALSE1) {
    NEXT_INST_F((continueLoop? 2 : TclGetInt1AtPtr(pc+1)), 0, 0);
      } else {
    NEXT_INST_F((continueLoop? 5 : TclGetInt4AtPtr(pc+1)), 0, 0);
      }
  }
 
    case INST_BEGIN_CATCH4:
  /*
   * Record start of the catch command with exception range index
   * equal to the operand. Push the current stack depth onto the
   * special catch stack.
   */
  catchStackPtr[++catchTop] = stackTop;
  TRACE(("%u => catchTop=%d, stackTop=%d\n",
         TclGetUInt4AtPtr(pc+1), catchTop, stackTop));
  NEXT_INST_F(5, 0, 0);
 
    case INST_END_CATCH:
  catchTop--;
  result = TCL_OK;
  TRACE(("=> catchTop=%d\n", catchTop));
  NEXT_INST_F(1, 0, 0);
 
    case INST_PUSH_RESULT:
  objResultPtr = Tcl_GetObjResult(interp);
  TRACE_WITH_OBJ(("=> "), Tcl_GetObjResult(interp));
 
  /*
   * See the comments at INST_INVOKE_STK
   */
  {
      Tcl_Obj *newObjResultPtr;
      TclNewObj(newObjResultPtr);
      Tcl_IncrRefCount(newObjResultPtr);
      iPtr->objResultPtr = newObjResultPtr;
  }
 
  NEXT_INST_F(1, 0, -1);
 
    case INST_PUSH_RETURN_CODE:
  objResultPtr = Tcl_NewLongObj(result);
  TRACE(("=> %u\n", result));
  NEXT_INST_F(1, 0, 1);
 
    default:
  panic("TclExecuteByteCode: unrecognized opCode %u", *pc);
    } /* end of switch on opCode */
 
    /*
     * Division by zero in an expression. Control only reaches this
     * point by "goto divideByZero".
     */
 
 divideByZero:
    DECACHE_STACK_INFO();
    Tcl_ResetResult(interp);
    Tcl_AppendToObj(Tcl_GetObjResult(interp), "divide by zero", -1);
    Tcl_SetErrorCode(interp, "ARITH", "DIVZERO", "divide by zero",
            (char *) NULL);
    CACHE_STACK_INFO();
 
    result = TCL_ERROR;
    goto checkForCatch;
 
    /*
     * An external evaluation (INST_INVOKE or INST_EVAL) returned
     * something different from TCL_OK, or else INST_BREAK or
     * INST_CONTINUE were called.
     */
 
 processExceptionReturn:
#if TCL_COMPILE_DEBUG
    switch (*pc) {
        case INST_INVOKE_STK1:
        case INST_INVOKE_STK4:
      TRACE(("%u => ... after \"%.20s\": ", opnd, cmdNameBuf));
      break;
        case INST_EVAL_STK:
      /*
       * Note that the object at stacktop has to be used
       * before doing the cleanup.
       */
 
      TRACE(("\"%.30s\" => ", O2S(stackPtr[stackTop])));
      break;
        default:
      TRACE(("=> "));
    }
#endif
    if ((result == TCL_CONTINUE) || (result == TCL_BREAK)) {
  rangePtr = GetExceptRangeForPc(pc, /*catchOnly*/ 0, codePtr);
  if (rangePtr == NULL) {
      TRACE_APPEND(("no encl. loop or catch, returning %s\n",
              StringForResultCode(result)));
      goto abnormalReturn;
  }
  if (rangePtr->type == CATCH_EXCEPTION_RANGE) {
      TRACE_APPEND(("%s ...\n", StringForResultCode(result)));
      goto processCatch;
  }
  while (cleanup--) {
      valuePtr = POP_OBJECT();
      TclDecrRefCount(valuePtr);
  }
  if (result == TCL_BREAK) {
      result = TCL_OK;
      pc = (codePtr->codeStart + rangePtr->breakOffset);
      TRACE_APPEND(("%s, range at %d, new pc %d\n",
       StringForResultCode(result),
       rangePtr->codeOffset, rangePtr->breakOffset));
      NEXT_INST_F(0, 0, 0);
  } else {
      if (rangePtr->continueOffset == -1) {
    TRACE_APPEND(("%s, loop w/o continue, checking for catch\n",
            StringForResultCode(result)));
    goto checkForCatch;
      }
      result = TCL_OK;
      pc = (codePtr->codeStart + rangePtr->continueOffset);
      TRACE_APPEND(("%s, range at %d, new pc %d\n",
       StringForResultCode(result),
       rangePtr->codeOffset, rangePtr->continueOffset));
      NEXT_INST_F(0, 0, 0);
  }
#if TCL_COMPILE_DEBUG
    } else if (traceInstructions) {
  if ((result != TCL_ERROR) && (result != TCL_RETURN))  {
      objPtr = Tcl_GetObjResult(interp);
      TRACE_APPEND(("OTHER RETURN CODE %d, result= \"%s\"\n ",
        result, O2S(objPtr)));
  } else {
      objPtr = Tcl_GetObjResult(interp);
      TRACE_APPEND(("%s, result= \"%s\"\n",
              StringForResultCode(result), O2S(objPtr)));
  }
#endif
    }
 
    /*
     * Execution has generated an "exception" such as TCL_ERROR. If the
     * exception is an error, record information about what was being
     * executed when the error occurred. Find the closest enclosing
     * catch range, if any. If no enclosing catch range is found, stop
     * execution and return the "exception" code.
     */
 
 checkForCatch:
    if ((result == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) {
  bytes = GetSrcInfoForPc(pc, codePtr, &length);
  if (bytes != NULL) {
      DECACHE_STACK_INFO();
      Tcl_LogCommandInfo(interp, codePtr->source, bytes, length);
            CACHE_STACK_INFO();
      iPtr->flags |= ERR_ALREADY_LOGGED;
  }
    }
    if (catchTop == -1) {
#ifdef TCL_COMPILE_DEBUG
  if (traceInstructions) {
      fprintf(stdout, "   ... no enclosing catch, returning %s\n",
              StringForResultCode(result));
  }
#endif
  goto abnormalReturn;
    }
    rangePtr = GetExceptRangeForPc(pc, /*catchOnly*/ 1, codePtr);
    if (rangePtr == NULL) {
  /*
   * This is only possible when compiling a [catch] that sends its
   * script to INST_EVAL. Cannot correct the compiler without
   * breakingcompat with previous .tbc compiled scripts.
   */
#ifdef TCL_COMPILE_DEBUG
  if (traceInstructions) {
      fprintf(stdout, "   ... no enclosing catch, returning %s\n",
              StringForResultCode(result));
  }
#endif
  goto abnormalReturn;
    }
 
    /*
     * A catch exception range (rangePtr) was found to handle an
     * "exception". It was found either by checkForCatch just above or
     * by an instruction during break, continue, or error processing.
     * Jump to its catchOffset after unwinding the operand stack to
     * the depth it had when starting to execute the range's catch
     * command.
     */
 
 processCatch:
    while (stackTop > catchStackPtr[catchTop]) {
  valuePtr = POP_OBJECT();
  TclDecrRefCount(valuePtr);
    }
#ifdef TCL_COMPILE_DEBUG
    if (traceInstructions) {
  fprintf(stdout, "  ... found catch at %d, catchTop=%d, unwound to %d, new pc %u\n",
          rangePtr->codeOffset, catchTop, catchStackPtr[catchTop],
          (unsigned int)(rangePtr->catchOffset));
    }
#endif
    pc = (codePtr->codeStart + rangePtr->catchOffset);
    NEXT_INST_F(0, 0, 0); /* restart the execution loop at pc */
 
    /*
     * end of infinite loop dispatching on instructions.
     */
 
    /*
     * Abnormal return code. Restore the stack to state it had when starting
     * to execute the ByteCode. Panic if the stack is below the initial level.
     */
 
 abnormalReturn:
    while (stackTop > initStackTop) {
  valuePtr = POP_OBJECT();
  TclDecrRefCount(valuePtr);
    }
    if (stackTop < initStackTop) {
  fprintf(stderr, "\nTclExecuteByteCode: abnormal return at pc %u: stack top %d < entry stack top %d\n",
          (unsigned int)(pc - codePtr->codeStart),
    (unsigned int) stackTop,
    (unsigned int) initStackTop);
  panic("TclExecuteByteCode execution failure: end stack top < start stack top");
    }
 
    /*
     * Free the catch stack array if malloc'ed storage was used.
     */
 
    if (catchStackPtr != catchStackStorage) {
  ckfree((char *) catchStackPtr);
    }
    eePtr->stackTop = initStackTop;
    return result;
#undef STATIC_CATCH_STACK_SIZE
}
 
#ifdef TCL_COMPILE_DEBUG
/*
 *----------------------------------------------------------------------
 *
 * PrintByteCodeInfo --
 *
 *  This procedure prints a summary about a bytecode object to stdout.
 *  It is called by TclExecuteByteCode when starting to execute the
 *  bytecode object if tclTraceExec has the value 2 or more.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  None.
 *
 *----------------------------------------------------------------------
 */
 
static void
PrintByteCodeInfo(codePtr)
    register ByteCode *codePtr; /* The bytecode whose summary is printed
         * to stdout. */
{
    Proc *procPtr = codePtr->procPtr;
    Interp *iPtr = (Interp *) *codePtr->interpHandle;
 
    fprintf(stdout, "\nExecuting ByteCode 0x%x, refCt %u, epoch %u, interp 0x%x (epoch %u)\n",
      (unsigned int) codePtr, codePtr->refCount,
      codePtr->compileEpoch, (unsigned int) iPtr,
      iPtr->compileEpoch);
 
    fprintf(stdout, "  Source: ");
    TclPrintSource(stdout, codePtr->source, 60);
 
    fprintf(stdout, "\n  Cmds %d, src %d, inst %u, litObjs %u, aux %d, stkDepth %u, code/src %.2f\n",
            codePtr->numCommands, codePtr->numSrcBytes,
      codePtr->numCodeBytes, codePtr->numLitObjects,
      codePtr->numAuxDataItems, codePtr->maxStackDepth,
#ifdef TCL_COMPILE_STATS
      (codePtr->numSrcBytes?
              ((float)codePtr->structureSize)/((float)codePtr->numSrcBytes) : 0.0));
#else
      0.0);
#endif
#ifdef TCL_COMPILE_STATS
    fprintf(stdout, "  Code %d = header %d+inst %d+litObj %d+exc %d+aux %d+cmdMap %d\n",
      codePtr->structureSize,
      (sizeof(ByteCode) - (sizeof(size_t) + sizeof(Tcl_Time))),
      codePtr->numCodeBytes,
      (codePtr->numLitObjects * sizeof(Tcl_Obj *)),
      (codePtr->numExceptRanges * sizeof(ExceptionRange)),
      (codePtr->numAuxDataItems * sizeof(AuxData)),
      codePtr->numCmdLocBytes);
#endif /* TCL_COMPILE_STATS */
    if (procPtr != NULL) {
  fprintf(stdout,
    "  Proc 0x%x, refCt %d, args %d, compiled locals %d\n",
    (unsigned int) procPtr, procPtr->refCount,
    procPtr->numArgs, procPtr->numCompiledLocals);
    }
}
#endif /* TCL_COMPILE_DEBUG */
 
/*
 *----------------------------------------------------------------------
 *
 * ValidatePcAndStackTop --
 *
 *  This procedure is called by TclExecuteByteCode when debugging to
 *  verify that the program counter and stack top are valid during
 *  execution.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  Prints a message to stderr and panics if either the pc or stack
 *  top are invalid.
 *
 *----------------------------------------------------------------------
 */
 
#ifdef TCL_COMPILE_DEBUG
static void
ValidatePcAndStackTop(codePtr, pc, stackTop, stackLowerBound)
    register ByteCode *codePtr; /* The bytecode whose summary is printed
         * to stdout. */
    unsigned char *pc;    /* Points to first byte of a bytecode
         * instruction. The program counter. */
    int stackTop;   /* Current stack top. Must be between
         * stackLowerBound and stackUpperBound
         * (inclusive). */
    int stackLowerBound;  /* Smallest legal value for stackTop. */
{
    int stackUpperBound = stackLowerBound +  codePtr->maxStackDepth;
                                /* Greatest legal value for stackTop. */
    unsigned int relativePc = (unsigned int) (pc - codePtr->codeStart);
    unsigned int codeStart = (unsigned int) codePtr->codeStart;
    unsigned int codeEnd = (unsigned int)
      (codePtr->codeStart + codePtr->numCodeBytes);
    unsigned char opCode = *pc;
 
    if (((unsigned int) pc < codeStart) || ((unsigned int) pc > codeEnd)) {
  fprintf(stderr, "\nBad instruction pc 0x%x in TclExecuteByteCode\n",
    (unsigned int) pc);
  panic("TclExecuteByteCode execution failure: bad pc");
    }
    if ((unsigned int) opCode > LAST_INST_OPCODE) {
  fprintf(stderr, "\nBad opcode %d at pc %u in TclExecuteByteCode\n",
    (unsigned int) opCode, relativePc);
        panic("TclExecuteByteCode execution failure: bad opcode");
    }
    if ((stackTop < stackLowerBound) || (stackTop > stackUpperBound)) {
  int numChars;
  char *cmd = GetSrcInfoForPc(pc, codePtr, &numChars);
  char *ellipsis = "";
 
  fprintf(stderr, "\nBad stack top %d at pc %u in TclExecuteByteCode (min %i, max %i)",
    stackTop, relativePc, stackLowerBound, stackUpperBound);
  if (cmd != NULL) {
      if (numChars > 100) {
    numChars = 100;
    ellipsis = "...";
      }
      fprintf(stderr, "\n executing %.*s%s\n", numChars, cmd,
        ellipsis);
  } else {
      fprintf(stderr, "\n");
  }
  panic("TclExecuteByteCode execution failure: bad stack top");
    }
}
#endif /* TCL_COMPILE_DEBUG */
 
/*
 *----------------------------------------------------------------------
 *
 * IllegalExprOperandType --
 *
 *  Used by TclExecuteByteCode to add an error message to errorInfo
 *  when an illegal operand type is detected by an expression
 *  instruction. The argument opndPtr holds the operand object in error.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  An error message is appended to errorInfo.
 *
 *----------------------------------------------------------------------
 */
 
static void
IllegalExprOperandType(interp, pc, opndPtr)
    Tcl_Interp *interp;   /* Interpreter to which error information
         * pertains. */
    unsigned char *pc;    /* Points to the instruction being executed
         * when the illegal type was found. */
    Tcl_Obj *opndPtr;   /* Points to the operand holding the value
         * with the illegal type. */
{
    unsigned char opCode = *pc;
 
    Tcl_ResetResult(interp);
    if ((opndPtr->bytes == NULL) || (opndPtr->length == 0)) {
  Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
    "can't use empty string as operand of \"",
    operatorStrings[opCode - INST_LOR], "\"", (char *) NULL);
    } else {
  char *msg = "non-numeric string";
  char *s, *p;
  int length;
  int looksLikeInt = 0;
 
  s = Tcl_GetStringFromObj(opndPtr, &length);
  p = s;
  /*
   * strtod() isn't at all consistent about detecting Inf and
   * NaN between platforms.
   */
  if (length == 3) {
      if ((s[0]=='n' || s[0]=='N') && (s[1]=='a' || s[1]=='A') &&
        (s[2]=='n' || s[2]=='N')) {
    msg = "non-numeric floating-point value";
    goto makeErrorMessage;
      }
      if ((s[0]=='i' || s[0]=='I') && (s[1]=='n' || s[1]=='N') &&
        (s[2]=='f' || s[2]=='F')) {
    msg = "infinite floating-point value";
    goto makeErrorMessage;
      }
  }
 
  /*
   * We cannot use TclLooksLikeInt here because it passes strings
   * like "10;" [Bug 587140]. We'll accept as "looking like ints"
   * for the present purposes any string that looks formally like
   * a (decimal|octal|hex) integer.
   */
 
  while (length && isspace(UCHAR(*p))) {
      length--;
      p++;
  }
  if (length && ((*p == '+') || (*p == '-'))) {
      length--;
      p++;
  }
  if (length) {
      if ((*p == '0') && ((*(p+1) == 'x') || (*(p+1) == 'X'))) {
    p += 2;
    length -= 2;
    looksLikeInt = ((length > 0) && isxdigit(UCHAR(*p)));
    if (looksLikeInt) {
        length--;
        p++;
        while (length && isxdigit(UCHAR(*p))) {
      length--;
      p++;
        }
    }
      } else {
    looksLikeInt = (length && isdigit(UCHAR(*p)));
    if (looksLikeInt) {
        length--;
        p++;
        while (length && isdigit(UCHAR(*p))) {
      length--;
      p++;
        }
    }
      }
      while (length && isspace(UCHAR(*p))) {
    length--;
    p++;
      }
      looksLikeInt = !length;
  }
  if (looksLikeInt) {
      /*
       * If something that looks like an integer could not be
       * converted, then it *must* be a bad octal or too large
       * to represent [Bug 542588].
       */
 
      if (TclCheckBadOctal(NULL, s)) {
    msg = "invalid octal number";
      } else {
    msg = "integer value too large to represent";
    Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
        "integer value too large to represent", (char *) NULL);
      }
  } else {
      /*
       * See if the operand can be interpreted as a double in
       * order to improve the error message.
       */
 
      double d;
 
      if (Tcl_GetDouble((Tcl_Interp *) NULL, s, &d) == TCL_OK) {
    msg = "floating-point value";
      }
  }
      makeErrorMessage:
  Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "can't use ",
    msg, " as operand of \"", operatorStrings[opCode - INST_LOR],
    "\"", (char *) NULL);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * GetSrcInfoForPc --
 *
 *  Given a program counter value, finds the closest command in the
 *  bytecode code unit's CmdLocation array and returns information about
 *  that command's source: a pointer to its first byte and the number of
 *  characters.
 *
 * Results:
 *  If a command is found that encloses the program counter value, a
 *  pointer to the command's source is returned and the length of the
 *  source is stored at *lengthPtr. If multiple commands resulted in
 *  code at pc, information about the closest enclosing command is
 *  returned. If no matching command is found, NULL is returned and
 *  *lengthPtr is unchanged.
 *
 * Side effects:
 *  None.
 *
 *----------------------------------------------------------------------
 */
 
static char *
GetSrcInfoForPc(pc, codePtr, lengthPtr)
    unsigned char *pc;    /* The program counter value for which to
         * return the closest command's source info.
         * This points to a bytecode instruction
         * in codePtr's code. */
    ByteCode *codePtr;    /* The bytecode sequence in which to look
         * up the command source for the pc. */
    int *lengthPtr;   /* If non-NULL, the location where the
         * length of the command's source should be
         * stored. If NULL, no length is stored. */
{
    register int pcOffset = (pc - codePtr->codeStart);
    int numCmds = codePtr->numCommands;
    unsigned char *codeDeltaNext, *codeLengthNext;
    unsigned char *srcDeltaNext, *srcLengthNext;
    int codeOffset, codeLen, codeEnd, srcOffset, srcLen, delta, i;
    int bestDist = INT_MAX; /* Distance of pc to best cmd's start pc. */
    int bestSrcOffset = -1; /* Initialized to avoid compiler warning. */
    int bestSrcLength = -1; /* Initialized to avoid compiler warning. */
 
    if ((pcOffset < 0) || (pcOffset >= codePtr->numCodeBytes)) {
  return NULL;
    }
 
    /*
     * Decode the code and source offset and length for each command. The
     * closest enclosing command is the last one whose code started before
     * pcOffset.
     */
 
    codeDeltaNext = codePtr->codeDeltaStart;
    codeLengthNext = codePtr->codeLengthStart;
    srcDeltaNext  = codePtr->srcDeltaStart;
    srcLengthNext = codePtr->srcLengthStart;
    codeOffset = srcOffset = 0;
    for (i = 0;  i < numCmds;  i++) {
  if ((unsigned int) (*codeDeltaNext) == (unsigned int) 0xFF) {
      codeDeltaNext++;
      delta = TclGetInt4AtPtr(codeDeltaNext);
      codeDeltaNext += 4;
  } else {
      delta = TclGetInt1AtPtr(codeDeltaNext);
      codeDeltaNext++;
  }
  codeOffset += delta;
 
  if ((unsigned int) (*codeLengthNext) == (unsigned int) 0xFF) {
      codeLengthNext++;
      codeLen = TclGetInt4AtPtr(codeLengthNext);
      codeLengthNext += 4;
  } else {
      codeLen = TclGetInt1AtPtr(codeLengthNext);
      codeLengthNext++;
  }
  codeEnd = (codeOffset + codeLen - 1);
 
  if ((unsigned int) (*srcDeltaNext) == (unsigned int) 0xFF) {
      srcDeltaNext++;
      delta = TclGetInt4AtPtr(srcDeltaNext);
      srcDeltaNext += 4;
  } else {
      delta = TclGetInt1AtPtr(srcDeltaNext);
      srcDeltaNext++;
  }
  srcOffset += delta;
 
  if ((unsigned int) (*srcLengthNext) == (unsigned int) 0xFF) {
      srcLengthNext++;
      srcLen = TclGetInt4AtPtr(srcLengthNext);
      srcLengthNext += 4;
  } else {
      srcLen = TclGetInt1AtPtr(srcLengthNext);
      srcLengthNext++;
  }
 
  if (codeOffset > pcOffset) {      /* best cmd already found */
      break;
  } else if (pcOffset <= codeEnd) { /* this cmd's code encloses pc */
      int dist = (pcOffset - codeOffset);
      if (dist <= bestDist) {
    bestDist = dist;
    bestSrcOffset = srcOffset;
    bestSrcLength = srcLen;
      }
  }
    }
 
    if (bestDist == INT_MAX) {
  return NULL;
    }
 
    if (lengthPtr != NULL) {
  *lengthPtr = bestSrcLength;
    }
    return (codePtr->source + bestSrcOffset);
}
 
/*
 *----------------------------------------------------------------------
 *
 * GetExceptRangeForPc --
 *
 *  Given a program counter value, return the closest enclosing
 *  ExceptionRange.
 *
 * Results:
 *  In the normal case, catchOnly is 0 (false) and this procedure
 *  returns a pointer to the most closely enclosing ExceptionRange
 *  structure regardless of whether it is a loop or catch exception
 *  range. This is appropriate when processing a TCL_BREAK or
 *  TCL_CONTINUE, which will be "handled" either by a loop exception
 *  range or a closer catch range. If catchOnly is nonzero, this
 *  procedure ignores loop exception ranges and returns a pointer to the
 *  closest catch range. If no matching ExceptionRange is found that
 *  encloses pc, a NULL is returned.
 *
 * Side effects:
 *  None.
 *
 *----------------------------------------------------------------------
 */
 
static ExceptionRange *
GetExceptRangeForPc(pc, catchOnly, codePtr)
    unsigned char *pc;    /* The program counter value for which to
         * search for a closest enclosing exception
         * range. This points to a bytecode
         * instruction in codePtr's code. */
    int catchOnly;    /* If 0, consider either loop or catch
         * ExceptionRanges in search. If nonzero
         * consider only catch ranges (and ignore
         * any closer loop ranges). */
    ByteCode* codePtr;    /* Points to the ByteCode in which to search
         * for the enclosing ExceptionRange. */
{
    ExceptionRange *rangeArrayPtr;
    int numRanges = codePtr->numExceptRanges;
    register ExceptionRange *rangePtr;
    int pcOffset = (pc - codePtr->codeStart);
    register int start;
 
    if (numRanges == 0) {
  return NULL;
    }
 
    /*
     * This exploits peculiarities of our compiler: nested ranges
     * are always *after* their containing ranges, so that by scanning
     * backwards we are sure that the first matching range is indeed
     * the deepest.
     */
 
    rangeArrayPtr = codePtr->exceptArrayPtr;
    rangePtr = rangeArrayPtr + numRanges;
    while (--rangePtr >= rangeArrayPtr) {
  start = rangePtr->codeOffset;
  if ((start <= pcOffset) &&
          (pcOffset < (start + rangePtr->numCodeBytes))) {
      if ((!catchOnly)
        || (rangePtr->type == CATCH_EXCEPTION_RANGE)) {
    return rangePtr;
      }
  }
    }
    return NULL;
}
 
/*
 *----------------------------------------------------------------------
 *
 * GetOpcodeName --
 *
 *  This procedure is called by the TRACE and TRACE_WITH_OBJ macros
 *  used in TclExecuteByteCode when debugging. It returns the name of
 *  the bytecode instruction at a specified instruction pc.
 *
 * Results:
 *  A character string for the instruction.
 *
 * Side effects:
 *  None.
 *
 *----------------------------------------------------------------------
 */
 
#ifdef TCL_COMPILE_DEBUG
static char *
GetOpcodeName(pc)
    unsigned char *pc;    /* Points to the instruction whose name
         * should be returned. */
{
    unsigned char opCode = *pc;
 
    return tclInstructionTable[opCode].name;
}
#endif /* TCL_COMPILE_DEBUG */
 
/*
 *----------------------------------------------------------------------
 *
 * VerifyExprObjType --
 *
 *  This procedure is called by the math functions to verify that
 *  the object is either an int or double, coercing it if necessary.
 *  If an error occurs during conversion, an error message is left
 *  in the interpreter's result unless "interp" is NULL.
 *
 * Results:
 *  TCL_OK if it was int or double, TCL_ERROR otherwise
 *
 * Side effects:
 *  objPtr is ensured to be of tclIntType, tclWideIntType or
 *  tclDoubleType.
 *
 *----------------------------------------------------------------------
 */
 
static int
VerifyExprObjType(interp, objPtr)
    Tcl_Interp *interp;   /* The interpreter in which to execute the
         * function. */
    Tcl_Obj *objPtr;    /* Points to the object to type check. */
{
    if (IS_NUMERIC_TYPE(objPtr->typePtr)) {
  return TCL_OK;
    } else {
  int length, result = TCL_OK;
  char *s = Tcl_GetStringFromObj(objPtr, &length);
 
  if (TclLooksLikeInt(s, length)) {
      long i;
      Tcl_WideInt w;
      GET_WIDE_OR_INT(result, objPtr, i, w);
  } else {
      double d;
      result = Tcl_GetDoubleFromObj((Tcl_Interp *) NULL, objPtr, &d);
  }
  if ((result != TCL_OK) && (interp != NULL)) {
      Tcl_ResetResult(interp);
      if (TclCheckBadOctal((Tcl_Interp *) NULL, s)) {
    Tcl_AppendToObj(Tcl_GetObjResult(interp),
      "argument to math function was an invalid octal number",
      -1);
      } else {
    Tcl_AppendToObj(Tcl_GetObjResult(interp),
      "argument to math function didn't have numeric value",
      -1);
      }
  }
  return result;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Math Functions --
 *
 *  This page contains the procedures that implement all of the
 *  built-in math functions for expressions.
 *
 * Results:
 *  Each procedure returns TCL_OK if it succeeds and pushes an
 *  Tcl object holding the result. If it fails it returns TCL_ERROR
 *  and leaves an error message in the interpreter's result.
 *
 * Side effects:
 *  None.
 *
 *----------------------------------------------------------------------
 */
 
static int
ExprUnaryFunc(interp, eePtr, clientData)
    Tcl_Interp *interp;   /* The interpreter in which to execute the
         * function. */
    ExecEnv *eePtr;   /* Points to the environment for executing
         * the function. */
    ClientData clientData;  /* Contains the address of a procedure that
         * takes one double argument and returns a
         * double result. */
{
    Tcl_Obj **stackPtr;   /* Cached evaluation stack base pointer. */
    register int stackTop;  /* Cached top index of evaluation stack. */
    register Tcl_Obj *valuePtr;
    double d, dResult;
    int result;
 
    double (*func) _ANSI_ARGS_((double)) =
  (double (*)_ANSI_ARGS_((double))) clientData;
 
    /*
     * Set stackPtr and stackTop from eePtr.
     */
 
    result = TCL_OK;
    CACHE_STACK_INFO();
 
    /*
     * Pop the function's argument from the evaluation stack. Convert it
     * to a double if necessary.
     */
 
    valuePtr = POP_OBJECT();
 
    if (VerifyExprObjType(interp, valuePtr) != TCL_OK) {
  result = TCL_ERROR;
  goto done;
    }
 
    GET_DOUBLE_VALUE(d, valuePtr, valuePtr->typePtr);
 
    errno = 0;
    dResult = (*func)(d);
    if ((errno != 0) || IS_NAN(dResult) || IS_INF(dResult)) {
  TclExprFloatError(interp, dResult);
  result = TCL_ERROR;
  goto done;
    }
 
    /*
     * Push a Tcl object holding the result.
     */
 
    PUSH_OBJECT(Tcl_NewDoubleObj(dResult));
 
    /*
     * Reflect the change to stackTop back in eePtr.
     */
 
    done:
    TclDecrRefCount(valuePtr);
    DECACHE_STACK_INFO();
    return result;
}
 
static int
ExprBinaryFunc(interp, eePtr, clientData)
    Tcl_Interp *interp;   /* The interpreter in which to execute the
         * function. */
    ExecEnv *eePtr;   /* Points to the environment for executing
         * the function. */
    ClientData clientData;  /* Contains the address of a procedure that

Line No.	Rev	Author	Line
1	2072	malin	`/*`
2			`* tclExecute.c --`
3			`*`
4			`* This file contains procedures that execute byte-compiled Tcl`
5			`* commands.`
6			`*`
7			`* Copyright (c) 1996-1997 Sun Microsystems, Inc.`
8			`* Copyright (c) 1998-2000 by Scriptics Corporation.`
9			`* Copyright (c) 2001 by Kevin B. Kenny. All rights reserved.`
10			`*`
11			`* See the file "license.terms" for information on usage and redistribution`
12			`* of this file, and for a DISCLAIMER OF ALL WARRANTIES.`
13			`*`
14			`* RCS: @(#) $Id: tclExecute.c,v 1.94.2.18 2005/12/12 11:28:22 rmax Exp $`
15			`*/`
16
17			`#include "tclInt.h"`
18			`#include "tclCompile.h"`
19
20			`#ifndef TCL_NO_MATH`
21			`# include "tclMath.h"`
22			`#endif`
23
24			`/*`
25			`* The stuff below is a bit of a hack so that this file can be used`
26			`* in environments that include no UNIX, i.e. no errno. Just define`
27			`* errno here.`
28			`*/`
29
30			`#ifndef TCL_GENERIC_ONLY`
31			`# include "tclPort.h"`
32			`#else /* TCL_GENERIC_ONLY */`
33			`# ifndef NO_FLOAT_H`
34			`# include <float.h>`
35			`# else /* NO_FLOAT_H */`
36			`# ifndef NO_VALUES_H`
37			`# include <values.h>`
38			`# endif /* !NO_VALUES_H */`
39			`# endif /* !NO_FLOAT_H */`
40			`# define NO_ERRNO_H`
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