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tclObj.c

/* 
 * tclObj.c --
 *
 *    This file contains Tcl object-related procedures that are used by
 *    many Tcl commands.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 1999 by Scriptics Corporation.
 * Copyright (c) 2001 by ActiveState Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclObj.c,v 1.42.2.14 2005/11/29 14:02:04 dkf Exp $
 */

#include "tclInt.h"
#include "tclCompile.h"
#include "tclPort.h"

/*
 * Table of all object types.
 */

static Tcl_HashTable typeTable;
static int typeTableInitialized = 0;    /* 0 means not yet initialized. */
TCL_DECLARE_MUTEX(tableMutex)

/*
 * Head of the list of free Tcl_Obj structs we maintain.
 */

Tcl_Obj *tclFreeObjList = NULL;

/*
 * The object allocator is single threaded.  This mutex is referenced
 * by the TclNewObj macro, however, so must be visible.
 */

#ifdef TCL_THREADS
Tcl_Mutex tclObjMutex;
#endif

/*
 * Pointer to a heap-allocated string of length zero that the Tcl core uses
 * as the value of an empty string representation for an object. This value
 * is shared by all new objects allocated by Tcl_NewObj.
 */

char tclEmptyString = '\0';
char *tclEmptyStringRep = &tclEmptyString;

/*
 * Prototypes for procedures defined later in this file:
 */

static int        SetBooleanFromAny _ANSI_ARGS_((Tcl_Interp *interp,
                      Tcl_Obj *objPtr));
static int        SetDoubleFromAny _ANSI_ARGS_((Tcl_Interp *interp,
                      Tcl_Obj *objPtr));
static int        SetIntFromAny _ANSI_ARGS_((Tcl_Interp *interp,
                      Tcl_Obj *objPtr));
static int        SetIntOrWideFromAny _ANSI_ARGS_((Tcl_Interp* interp,
                                           Tcl_Obj *objPtr));
static void       UpdateStringOfBoolean _ANSI_ARGS_((Tcl_Obj *objPtr));
static void       UpdateStringOfDouble _ANSI_ARGS_((Tcl_Obj *objPtr));
static void       UpdateStringOfInt _ANSI_ARGS_((Tcl_Obj *objPtr));
static int        SetWideIntFromAny _ANSI_ARGS_((Tcl_Interp *interp,
                      Tcl_Obj *objPtr));

#ifndef TCL_WIDE_INT_IS_LONG
static void       UpdateStringOfWideInt _ANSI_ARGS_((Tcl_Obj *objPtr));
#endif

/*
 * Prototypes for the array hash key methods.
 */

static Tcl_HashEntry *  AllocObjEntry _ANSI_ARGS_((
                      Tcl_HashTable *tablePtr, VOID *keyPtr));
static int        CompareObjKeys _ANSI_ARGS_((
                      VOID *keyPtr, Tcl_HashEntry *hPtr));
static void       FreeObjEntry _ANSI_ARGS_((
                      Tcl_HashEntry *hPtr));
static unsigned int     HashObjKey _ANSI_ARGS_((
                      Tcl_HashTable *tablePtr,
                      VOID *keyPtr));

/*
 * Prototypes for the CommandName object type.
 */

static void       DupCmdNameInternalRep _ANSI_ARGS_((Tcl_Obj *objPtr,
                      Tcl_Obj *copyPtr));
static void       FreeCmdNameInternalRep _ANSI_ARGS_((
                      Tcl_Obj *objPtr));
static int        SetCmdNameFromAny _ANSI_ARGS_((Tcl_Interp *interp,
                      Tcl_Obj *objPtr));


/*
 * The structures below defines the Tcl object types defined in this file by
 * means of procedures that can be invoked by generic object code. See also
 * tclStringObj.c, tclListObj.c, tclByteCode.c for other type manager
 * implementations.
 */

Tcl_ObjType tclBooleanType = {
    "boolean",                      /* name */
    (Tcl_FreeInternalRepProc *) NULL,   /* freeIntRepProc */
    (Tcl_DupInternalRepProc *) NULL,      /* dupIntRepProc */
    UpdateStringOfBoolean,          /* updateStringProc */
    SetBooleanFromAny               /* setFromAnyProc */
};

Tcl_ObjType tclDoubleType = {
    "double",                       /* name */
    (Tcl_FreeInternalRepProc *) NULL,   /* freeIntRepProc */
    (Tcl_DupInternalRepProc *) NULL,      /* dupIntRepProc */
    UpdateStringOfDouble,           /* updateStringProc */
    SetDoubleFromAny                /* setFromAnyProc */
};

Tcl_ObjType tclIntType = {
    "int",                    /* name */
    (Tcl_FreeInternalRepProc *) NULL,   /* freeIntRepProc */
    (Tcl_DupInternalRepProc *) NULL,      /* dupIntRepProc */
    UpdateStringOfInt,              /* updateStringProc */
    SetIntFromAny             /* setFromAnyProc */
};

Tcl_ObjType tclWideIntType = {
    "wideInt",                      /* name */
    (Tcl_FreeInternalRepProc *) NULL,   /* freeIntRepProc */
    (Tcl_DupInternalRepProc *) NULL,      /* dupIntRepProc */
#ifdef TCL_WIDE_INT_IS_LONG
    UpdateStringOfInt,              /* updateStringProc */
#else /* !TCL_WIDE_INT_IS_LONG */
    UpdateStringOfWideInt,          /* updateStringProc */
#endif
    SetWideIntFromAny               /* setFromAnyProc */
};

/*
 * The structure below defines the Tcl obj hash key type.
 */
Tcl_HashKeyType tclObjHashKeyType = {
    TCL_HASH_KEY_TYPE_VERSION,            /* version */
    0,                              /* flags */
    HashObjKey,                     /* hashKeyProc */
    CompareObjKeys,                 /* compareKeysProc */
    AllocObjEntry,                  /* allocEntryProc */
    FreeObjEntry              /* freeEntryProc */
};

/*
 * The structure below defines the command name Tcl object type by means of
 * procedures that can be invoked by generic object code. Objects of this
 * type cache the Command pointer that results from looking up command names
 * in the command hashtable. Such objects appear as the zeroth ("command
 * name") argument in a Tcl command.
 *
 * NOTE: the ResolvedCmdName that gets cached is stored in the
 * twoPtrValue.ptr1 field, and the twoPtrValue.ptr2 field is unused.
 * You might think you could use the simpler otherValuePtr field to
 * store the single ResolvedCmdName pointer, but DO NOT DO THIS.  It
 * seems that some extensions use the second internal pointer field
 * of the twoPtrValue field for their own purposes.
 */

static Tcl_ObjType tclCmdNameType = {
    "cmdName",                      /* name */
    FreeCmdNameInternalRep,         /* freeIntRepProc */
    DupCmdNameInternalRep,          /* dupIntRepProc */
    (Tcl_UpdateStringProc *) NULL,  /* updateStringProc */
    SetCmdNameFromAny               /* setFromAnyProc */
};


/*
 * Structure containing a cached pointer to a command that is the result
 * of resolving the command's name in some namespace. It is the internal
 * representation for a cmdName object. It contains the pointer along
 * with some information that is used to check the pointer's validity.
 */

typedef struct ResolvedCmdName {
    Command *cmdPtr;          /* A cached Command pointer. */
    Namespace *refNsPtr;      /* Points to the namespace containing the
                         * reference (not the namespace that
                         * contains the referenced command). */
    long refNsId;       /* refNsPtr's unique namespace id. Used to
                         * verify that refNsPtr is still valid
                         * (e.g., it's possible that the cmd's
                         * containing namespace was deleted and a
                         * new one created at the same address). */
    int refNsCmdEpoch;        /* Value of the referencing namespace's
                         * cmdRefEpoch when the pointer was cached.
                         * Before using the cached pointer, we check
                         * if the namespace's epoch was incremented;
                         * if so, this cached pointer is invalid. */
    int cmdEpoch;       /* Value of the command's cmdEpoch when this
                         * pointer was cached. Before using the
                         * cached pointer, we check if the cmd's
                         * epoch was incremented; if so, the cmd was
                         * renamed, deleted, hidden, or exposed, and
                         * so the pointer is invalid. */
    int refCount;       /* Reference count: 1 for each cmdName
                         * object that has a pointer to this
                         * ResolvedCmdName structure as its internal
                         * rep. This structure can be freed when
                         * refCount becomes zero. */
} ResolvedCmdName;


/*
 *-------------------------------------------------------------------------
 *
 * TclInitObjectSubsystem --
 *
 *    This procedure is invoked to perform once-only initialization of
 *    the type table. It also registers the object types defined in 
 *    this file.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Initializes the table of defined object types "typeTable" with
 *    builtin object types defined in this file.  
 *
 *-------------------------------------------------------------------------
 */

void
TclInitObjSubsystem()
{
    Tcl_MutexLock(&tableMutex);
    typeTableInitialized = 1;
    Tcl_InitHashTable(&typeTable, TCL_STRING_KEYS);
    Tcl_MutexUnlock(&tableMutex);

    Tcl_RegisterObjType(&tclBooleanType);
    Tcl_RegisterObjType(&tclByteArrayType);
    Tcl_RegisterObjType(&tclDoubleType);
    Tcl_RegisterObjType(&tclEndOffsetType);
    Tcl_RegisterObjType(&tclIntType);
    Tcl_RegisterObjType(&tclWideIntType);
    Tcl_RegisterObjType(&tclStringType);
    Tcl_RegisterObjType(&tclListType);
    Tcl_RegisterObjType(&tclByteCodeType);
    Tcl_RegisterObjType(&tclProcBodyType);
    Tcl_RegisterObjType(&tclArraySearchType);
    Tcl_RegisterObjType(&tclIndexType);
    Tcl_RegisterObjType(&tclNsNameType);
    Tcl_RegisterObjType(&tclCmdNameType);

#ifdef TCL_COMPILE_STATS
    Tcl_MutexLock(&tclObjMutex);
    tclObjsAlloced = 0;
    tclObjsFreed = 0;
    {
      int i;
      for (i = 0;  i < TCL_MAX_SHARED_OBJ_STATS;  i++) {
          tclObjsShared[i] = 0;
      }
    }
    Tcl_MutexUnlock(&tclObjMutex);
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeObjects --
 *
 *    This procedure is called by Tcl_Finalize to clean up all
 *    registered Tcl_ObjType's and to reset the tclFreeObjList.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeObjects()
{
    Tcl_MutexLock(&tableMutex);
    if (typeTableInitialized) {
        Tcl_DeleteHashTable(&typeTable);
        typeTableInitialized = 0;
    }
    Tcl_MutexUnlock(&tableMutex);

    /* 
     * All we do here is reset the head pointer of the linked list of
     * free Tcl_Obj's to NULL;  the memory finalization will take care
     * of releasing memory for us.
     */
    Tcl_MutexLock(&tclObjMutex);
    tclFreeObjList = NULL;
    Tcl_MutexUnlock(&tclObjMutex);
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_RegisterObjType --
 *
 *    This procedure is called to register a new Tcl object type
 *    in the table of all object types supported by Tcl.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The type is registered in the Tcl type table. If there was already
 *    a type with the same name as in typePtr, it is replaced with the
 *    new type.
 *
 *--------------------------------------------------------------
 */

void
Tcl_RegisterObjType(typePtr)
    Tcl_ObjType *typePtr;     /* Information about object type;
                         * storage must be statically
                         * allocated (must live forever). */
{
    int new;
    Tcl_MutexLock(&tableMutex);
    Tcl_SetHashValue(
          Tcl_CreateHashEntry(&typeTable, typePtr->name, &new), typePtr);
    Tcl_MutexUnlock(&tableMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AppendAllObjTypes --
 *
 *    This procedure appends onto the argument object the name of each
 *    object type as a list element. This includes the builtin object
 *    types (e.g. int, list) as well as those added using
 *    Tcl_NewObj. These names can be used, for example, with
 *    Tcl_GetObjType to get pointers to the corresponding Tcl_ObjType
 *    structures.
 *
 * Results:
 *    The return value is normally TCL_OK; in this case the object
 *    referenced by objPtr has each type name appended to it. If an
 *    error occurs, TCL_ERROR is returned and the interpreter's result
 *    holds an error message.
 *
 * Side effects:
 *    If necessary, the object referenced by objPtr is converted into
 *    a list object.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_AppendAllObjTypes(interp, objPtr)
    Tcl_Interp *interp;       /* Interpreter used for error reporting. */
    Tcl_Obj *objPtr;          /* Points to the Tcl object onto which the
                         * name of each registered type is appended
                         * as a list element. */
{
    register Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    int objc;
    Tcl_Obj **objv;

    /*
     * Get the test for a valid list out of the way first.
     */

    if (Tcl_ListObjGetElements(interp, objPtr, &objc, &objv) != TCL_OK) {
      return TCL_ERROR;
    }

    /*
     * Type names are NUL-terminated, not counted strings.
     * This code relies on that.
     */

    Tcl_MutexLock(&tableMutex);
    for (hPtr = Tcl_FirstHashEntry(&typeTable, &search);
          hPtr != NULL;  hPtr = Tcl_NextHashEntry(&search)) {
      Tcl_ListObjAppendElement(NULL, objPtr,
              Tcl_NewStringObj(Tcl_GetHashKey(&typeTable, hPtr), -1));
    }
    Tcl_MutexUnlock(&tableMutex);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetObjType --
 *
 *    This procedure looks up an object type by name.
 *
 * Results:
 *    If an object type with name matching "typeName" is found, a pointer
 *    to its Tcl_ObjType structure is returned; otherwise, NULL is
 *    returned.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

Tcl_ObjType *
Tcl_GetObjType(typeName)
    CONST char *typeName;     /* Name of Tcl object type to look up. */
{
    register Tcl_HashEntry *hPtr;
    Tcl_ObjType *typePtr = NULL;

    Tcl_MutexLock(&tableMutex);
    hPtr = Tcl_FindHashEntry(&typeTable, typeName);
    if (hPtr != (Tcl_HashEntry *) NULL) {
        typePtr = (Tcl_ObjType *) Tcl_GetHashValue(hPtr);
    }
    Tcl_MutexUnlock(&tableMutex);
    return typePtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ConvertToType --
 *
 *    Convert the Tcl object "objPtr" to have type "typePtr" if possible.
 *
 * Results:
 *    The return value is TCL_OK on success and TCL_ERROR on failure. If
 *    TCL_ERROR is returned, then the interpreter's result contains an
 *    error message unless "interp" is NULL. Passing a NULL "interp"
 *    allows this procedure to be used as a test whether the conversion
 *    could be done (and in fact was done).
 *
 * Side effects:
 *    Any internal representation for the old type is freed.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_ConvertToType(interp, objPtr, typePtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    Tcl_Obj *objPtr;          /* The object to convert. */
    Tcl_ObjType *typePtr;     /* The target type. */
{
    if (objPtr->typePtr == typePtr) {
      return TCL_OK;
    }

    /*
     * Use the target type's Tcl_SetFromAnyProc to set "objPtr"s internal
     * form as appropriate for the target type. This frees the old internal
     * representation.
     */

    return typePtr->setFromAnyProc(interp, objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewObj --
 *
 *    This procedure is normally called when not debugging: i.e., when
 *    TCL_MEM_DEBUG is not defined. It creates new Tcl objects that denote
 *    the empty string. These objects have a NULL object type and NULL
 *    string representation byte pointer. Type managers call this routine
 *    to allocate new objects that they further initialize.
 *
 *    When TCL_MEM_DEBUG is defined, this procedure just returns the
 *    result of calling the debugging version Tcl_DbNewObj.
 *
 * Results:
 *    The result is a newly allocated object that represents the empty
 *    string. The new object's typePtr is set NULL and its ref count
 *    is set to 0.
 *
 * Side effects:
 *    If compiling with TCL_COMPILE_STATS, this procedure increments
 *    the global count of allocated objects (tclObjsAlloced).
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewObj

Tcl_Obj *
Tcl_NewObj()
{
    return Tcl_DbNewObj("unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewObj()
{
    register Tcl_Obj *objPtr;

    /*
     * Use the macro defined in tclInt.h - it will use the
     * correct allocator.
     */

    TclNewObj(objPtr);
    return objPtr;
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewObj --
 *
 *    This procedure is normally called when debugging: i.e., when
 *    TCL_MEM_DEBUG is defined. It creates new Tcl objects that denote the
 *    empty string. It is the same as the Tcl_NewObj procedure above
 *    except that it calls Tcl_DbCkalloc directly with the file name and
 *    line number from its caller. This simplifies debugging since then
 *    the [memory active] command will report the correct file name and line
 *    number when reporting objects that haven't been freed.
 *
 *    When TCL_MEM_DEBUG is not defined, this procedure just returns the
 *    result of calling Tcl_NewObj.
 *
 * Results:
 *    The result is a newly allocated that represents the empty string.
 *    The new object's typePtr is set NULL and its ref count is set to 0.
 *
 * Side effects:
 *    If compiling with TCL_COMPILE_STATS, this procedure increments
 *    the global count of allocated objects (tclObjsAlloced).
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewObj(file, line)
    register CONST char *file;      /* The name of the source file calling this
                         * procedure; used for debugging. */
    register int line;        /* Line number in the source file; used
                         * for debugging. */
{
    register Tcl_Obj *objPtr;

    /*
     * Use the macro defined in tclInt.h - it will use the
     * correct allocator.
     */

    TclDbNewObj(objPtr, file, line);
    return objPtr;
}
#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewObj(file, line)
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    return Tcl_NewObj();
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * TclAllocateFreeObjects --
 *
 *    Procedure to allocate a number of free Tcl_Objs. This is done using
 *    a single ckalloc to reduce the overhead for Tcl_Obj allocation.
 *
 *    Assumes mutex is held.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    tclFreeObjList, the head of the list of free Tcl_Objs, is set to the
 *    first of a number of free Tcl_Obj's linked together by their
 *    internalRep.otherValuePtrs.
 *
 *----------------------------------------------------------------------
 */

#define OBJS_TO_ALLOC_EACH_TIME 100

void
TclAllocateFreeObjects()
{
    size_t bytesToAlloc = (OBJS_TO_ALLOC_EACH_TIME * sizeof(Tcl_Obj));
    char *basePtr;
    register Tcl_Obj *prevPtr, *objPtr;
    register int i;

    /*
     * This has been noted by Purify to be a potential leak.  The problem is
     * that Tcl, when not TCL_MEM_DEBUG compiled, keeps around all allocated
     * Tcl_Obj's, pointed to by tclFreeObjList, when freed instead of
     * actually freeing the memory.  TclFinalizeObjects() does not ckfree()
     * this memory, but leaves it to Tcl's memory subsystem finalziation to
     * release it.  Purify apparently can't figure that out, and fires a
     * false alarm.
     */

    basePtr = (char *) ckalloc(bytesToAlloc);
    memset(basePtr, 0, bytesToAlloc);

    prevPtr = NULL;
    objPtr = (Tcl_Obj *) basePtr;
    for (i = 0; i < OBJS_TO_ALLOC_EACH_TIME; i++) {
      objPtr->internalRep.otherValuePtr = (VOID *) prevPtr;
      prevPtr = objPtr;
      objPtr++;
    }
    tclFreeObjList = prevPtr;
}
#undef OBJS_TO_ALLOC_EACH_TIME

/*
 *----------------------------------------------------------------------
 *
 * TclFreeObj --
 *
 *    This procedure frees the memory associated with the argument
 *    object. It is called by the tcl.h macro Tcl_DecrRefCount when an
 *    object's ref count is zero. It is only "public" since it must
 *    be callable by that macro wherever the macro is used. It should not
 *    be directly called by clients.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Deallocates the storage for the object's Tcl_Obj structure
 *    after deallocating the string representation and calling the
 *    type-specific Tcl_FreeInternalRepProc to deallocate the object's
 *    internal representation. If compiling with TCL_COMPILE_STATS,
 *    this procedure increments the global count of freed objects
 *    (tclObjsFreed).
 *
 *----------------------------------------------------------------------
 */

void
TclFreeObj(objPtr)
    register Tcl_Obj *objPtr; /* The object to be freed. */
{
    register Tcl_ObjType *typePtr = objPtr->typePtr;
    
#ifdef TCL_MEM_DEBUG
    if ((objPtr)->refCount < -1) {
      panic("Reference count for %lx was negative", objPtr);
    }
#endif /* TCL_MEM_DEBUG */

    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
      typePtr->freeIntRepProc(objPtr);
    }
    Tcl_InvalidateStringRep(objPtr);

    /*
     * If debugging Tcl's memory usage, deallocate the object using ckfree.
     * Otherwise, deallocate it by adding it onto the list of free
     * Tcl_Obj structs we maintain.
     */

#if defined(TCL_MEM_DEBUG) || defined(PURIFY)
    Tcl_MutexLock(&tclObjMutex);
    ckfree((char *) objPtr);
    Tcl_MutexUnlock(&tclObjMutex);
#elif defined(TCL_THREADS) && defined(USE_THREAD_ALLOC) 
    TclThreadFreeObj(objPtr); 
#else 
    Tcl_MutexLock(&tclObjMutex);
    objPtr->internalRep.otherValuePtr = (VOID *) tclFreeObjList;
    tclFreeObjList = objPtr;
    Tcl_MutexUnlock(&tclObjMutex);
#endif /* TCL_MEM_DEBUG */

#ifdef TCL_COMPILE_STATS
    tclObjsFreed++;
#endif /* TCL_COMPILE_STATS */
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DuplicateObj --
 *
 *    Create and return a new object that is a duplicate of the argument
 *    object.
 *
 * Results:
 *    The return value is a pointer to a newly created Tcl_Obj. This
 *    object has reference count 0 and the same type, if any, as the
 *    source object objPtr. Also:
 *      1) If the source object has a valid string rep, we copy it;
 *         otherwise, the duplicate's string rep is set NULL to mark
 *         it invalid.
 *      2) If the source object has an internal representation (i.e. its
 *         typePtr is non-NULL), the new object's internal rep is set to
 *         a copy; otherwise the new internal rep is marked invalid.
 *
 * Side effects:
 *      What constitutes "copying" the internal representation depends on
 *    the type. For example, if the argument object is a list,
 *    the element objects it points to will not actually be copied but
 *    will be shared with the duplicate list. That is, the ref counts of
 *    the element objects will be incremented.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
Tcl_DuplicateObj(objPtr)
    register Tcl_Obj *objPtr;       /* The object to duplicate. */
{
    register Tcl_ObjType *typePtr = objPtr->typePtr;
    register Tcl_Obj *dupPtr;

    TclNewObj(dupPtr);

    if (objPtr->bytes == NULL) {
      dupPtr->bytes = NULL;
    } else if (objPtr->bytes != tclEmptyStringRep) {
      TclInitStringRep(dupPtr, objPtr->bytes, objPtr->length);
    }
    
    if (typePtr != NULL) {
      if (typePtr->dupIntRepProc == NULL) {
          dupPtr->internalRep = objPtr->internalRep;
          dupPtr->typePtr = typePtr;
      } else {
          (*typePtr->dupIntRepProc)(objPtr, dupPtr);
      }
    }
    return dupPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetString --
 *
 *    Returns the string representation byte array pointer for an object.
 *
 * Results:
 *    Returns a pointer to the string representation of objPtr. The byte
 *    array referenced by the returned pointer must not be modified by the
 *    caller. Furthermore, the caller must copy the bytes if they need to
 *    retain them since the object's string rep can change as a result of
 *    other operations.
 *
 * Side effects:
 *    May call the object's updateStringProc to update the string
 *    representation from the internal representation.
 *
 *----------------------------------------------------------------------
 */

char *
Tcl_GetString(objPtr)
    register Tcl_Obj *objPtr; /* Object whose string rep byte pointer
                         * should be returned. */
{
    if (objPtr->bytes != NULL) {
      return objPtr->bytes;
    }

    if (objPtr->typePtr->updateStringProc == NULL) {
      panic("UpdateStringProc should not be invoked for type %s",
            objPtr->typePtr->name);
    }
    (*objPtr->typePtr->updateStringProc)(objPtr);
    return objPtr->bytes;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetStringFromObj --
 *
 *    Returns the string representation's byte array pointer and length
 *    for an object.
 *
 * Results:
 *    Returns a pointer to the string representation of objPtr. If
 *    lengthPtr isn't NULL, the length of the string representation is
 *    stored at *lengthPtr. The byte array referenced by the returned
 *    pointer must not be modified by the caller. Furthermore, the
 *    caller must copy the bytes if they need to retain them since the
 *    object's string rep can change as a result of other operations.
 *
 * Side effects:
 *    May call the object's updateStringProc to update the string
 *    representation from the internal representation.
 *
 *----------------------------------------------------------------------
 */

char *
Tcl_GetStringFromObj(objPtr, lengthPtr)
    register Tcl_Obj *objPtr; /* Object whose string rep byte pointer should
                         * be returned. */
    register int *lengthPtr;  /* If non-NULL, the location where the string
                         * rep's byte array length should * be stored.
                         * If NULL, no length is stored. */
{
    if (objPtr->bytes == NULL) {
      if (objPtr->typePtr->updateStringProc == NULL) {
          panic("UpdateStringProc should not be invoked for type %s",
                objPtr->typePtr->name);
      }
      (*objPtr->typePtr->updateStringProc)(objPtr);
    }

    if (lengthPtr != NULL) {
      *lengthPtr = objPtr->length;
    }
    return objPtr->bytes;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InvalidateStringRep --
 *
 *    This procedure is called to invalidate an object's string
 *    representation. 
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Deallocates the storage for any old string representation, then
 *    sets the string representation NULL to mark it invalid.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_InvalidateStringRep(objPtr)
     register Tcl_Obj *objPtr;      /* Object whose string rep byte pointer
                         * should be freed. */
{
    if (objPtr->bytes != NULL) {
      if (objPtr->bytes != tclEmptyStringRep) {
          ckfree((char *) objPtr->bytes);
      }
      objPtr->bytes = NULL;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewBooleanObj --
 *
 *    This procedure is normally called when not debugging: i.e., when
 *    TCL_MEM_DEBUG is not defined. It creates a new Tcl_Obj and
 *    initializes it from the argument boolean value. A nonzero
 *    "boolValue" is coerced to 1.
 *
 *    When TCL_MEM_DEBUG is defined, this procedure just returns the
 *    result of calling the debugging version Tcl_DbNewBooleanObj.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewBooleanObj

Tcl_Obj *
Tcl_NewBooleanObj(boolValue)
    register int boolValue;   /* Boolean used to initialize new object. */
{
    return Tcl_DbNewBooleanObj(boolValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewBooleanObj(boolValue)
    register int boolValue;   /* Boolean used to initialize new object. */
{
    register Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.longValue = (boolValue? 1 : 0);
    objPtr->typePtr = &tclBooleanType;
    return objPtr;
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewBooleanObj --
 *
 *    This procedure is normally called when debugging: i.e., when
 *    TCL_MEM_DEBUG is defined. It creates new boolean objects. It is the
 *    same as the Tcl_NewBooleanObj procedure above except that it calls
 *    Tcl_DbCkalloc directly with the file name and line number from its
 *    caller. This simplifies debugging since then the [memory active]
 *    command     will report the correct file name and line number when
 *    reporting objects that haven't been freed.
 *
 *    When TCL_MEM_DEBUG is not defined, this procedure just returns the
 *    result of calling Tcl_NewBooleanObj.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewBooleanObj(boolValue, file, line)
    register int boolValue;   /* Boolean used to initialize new object. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.longValue = (boolValue? 1 : 0);
    objPtr->typePtr = &tclBooleanType;
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewBooleanObj(boolValue, file, line)
    register int boolValue;   /* Boolean used to initialize new object. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    return Tcl_NewBooleanObj(boolValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetBooleanObj --
 *
 *    Modify an object to be a boolean object and to have the specified
 *    boolean value. A nonzero "boolValue" is coerced to 1.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's old string rep, if any, is freed. Also, any old
 *    internal rep is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetBooleanObj(objPtr, boolValue)
    register Tcl_Obj *objPtr; /* Object whose internal rep to init. */
    register int boolValue;   /* Boolean used to set object's value. */
{
    register Tcl_ObjType *oldTypePtr = objPtr->typePtr;

    if (Tcl_IsShared(objPtr)) {
      panic("Tcl_SetBooleanObj called with shared object");
    }
    
    if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.longValue = (boolValue? 1 : 0);
    objPtr->typePtr = &tclBooleanType;
    Tcl_InvalidateStringRep(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetBooleanFromObj --
 *
 *    Attempt to return a boolean from the Tcl object "objPtr". If the
 *    object is not already a boolean, an attempt will be made to convert
 *    it to one.
 *
 * Results:
 *    The return value is a standard Tcl object result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If the object is not already a boolean, the conversion will free
 *    any old internal representation. 
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetBooleanFromObj(interp, objPtr, boolPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object from which to get boolean. */
    register int *boolPtr;    /* Place to store resulting boolean. */
{
    register int result;

    if (objPtr->typePtr == &tclBooleanType) {
      result = TCL_OK;
    } else {
      result = SetBooleanFromAny(interp, objPtr);
    }

    if (result == TCL_OK) {
      *boolPtr = (int) objPtr->internalRep.longValue;
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * SetBooleanFromAny --
 *
 *    Attempt to generate a boolean internal form for the Tcl object
 *    "objPtr".
 *
 * Results:
 *    The return value is a standard Tcl result. If an error occurs during
 *    conversion, an error message is left in the interpreter's result
 *    unless "interp" is NULL.
 *
 * Side effects:
 *    If no error occurs, an integer 1 or 0 is stored as "objPtr"s
 *    internal representation and the type of "objPtr" is set to boolean.
 *
 *----------------------------------------------------------------------
 */

static int
SetBooleanFromAny(interp, objPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object to convert. */
{
    Tcl_ObjType *oldTypePtr = objPtr->typePtr;
    char *string, *end;
    register char c;
    char lowerCase[10];
    int newBool, length;
    register int i;

    /*
     * Get the string representation. Make it up-to-date if necessary.
     */
    
    string = Tcl_GetStringFromObj(objPtr, &length);

    /*
     * Use the obvious shortcuts for numerical values; if objPtr is not
     * of numerical type, parse its string rep.
     */
      
    if (objPtr->typePtr == &tclIntType) {
      newBool = (objPtr->internalRep.longValue != 0);
    } else if (objPtr->typePtr == &tclDoubleType) {
      newBool = (objPtr->internalRep.doubleValue != 0.0);
    } else if (objPtr->typePtr == &tclWideIntType) {
      newBool = (objPtr->internalRep.wideValue != 0);
    } else {
      /*
       * Copy the string converting its characters to lower case.
       */
      
      for (i = 0;  (i < 9) && (i < length);  i++) {
          c = string[i];
          /*
           * Weed out international characters so we can safely operate
           * on single bytes.
           */
          
          if (c & 0x80) {
            goto badBoolean;
          }
          if (Tcl_UniCharIsUpper(UCHAR(c))) {
            c = (char) Tcl_UniCharToLower(UCHAR(c));
          }
          lowerCase[i] = c;
      }
      lowerCase[i] = 0;
      
      /*
       * Parse the string as a boolean. We use an implementation here that
       * doesn't report errors in interp if interp is NULL.
       */
      
      c = lowerCase[0];
      if ((c == '0') && (lowerCase[1] == '\0')) {
          newBool = 0;
      } else if ((c == '1') && (lowerCase[1] == '\0')) {
          newBool = 1;
      } else if ((c == 'y') && (strncmp(lowerCase, "yes", (size_t) length) == 0)) {
          newBool = 1;
      } else if ((c == 'n') && (strncmp(lowerCase, "no", (size_t) length) == 0)) {
          newBool = 0;
      } else if ((c == 't') && (strncmp(lowerCase, "true", (size_t) length) == 0)) {
          newBool = 1;
      } else if ((c == 'f') && (strncmp(lowerCase, "false", (size_t) length) == 0)) {
          newBool = 0;
      } else if ((c == 'o') && (length >= 2)) {
          if (strncmp(lowerCase, "on", (size_t) length) == 0) {
            newBool = 1;
          } else if (strncmp(lowerCase, "off", (size_t) length) == 0) {
            newBool = 0;
          } else {
            goto badBoolean;
          }
      } else {
          double dbl;
          /*
           * Boolean values can be extracted from ints or doubles.  Note
           * that we don't use strtoul or strtoull here because we don't
           * care about what the value is, just whether it is equal to
           * zero or not.
           */
#ifdef TCL_WIDE_INT_IS_LONG
          newBool = strtol(string, &end, 0);
          if (end != string) {
            /*
             * Make sure the string has no garbage after the end of
             * the int.
             */
            while ((end < (string+length))
                   && isspace(UCHAR(*end))) { /* INTL: ISO only */
                end++;
            }
            if (end == (string+length)) {
                newBool = (newBool != 0);
                goto goodBoolean;
            }
          }
#else /* !TCL_WIDE_INT_IS_LONG */
          Tcl_WideInt wide = strtoll(string, &end, 0);
          if (end != string) {
            /*
             * Make sure the string has no garbage after the end of
             * the wide int.
             */
            while ((end < (string+length))
                   && isspace(UCHAR(*end))) { /* INTL: ISO only */
                end++;
            }
            if (end == (string+length)) {
                newBool = (wide != Tcl_LongAsWide(0));
                goto goodBoolean;
            }
          }
#endif /* TCL_WIDE_INT_IS_LONG */
          /*
           * Still might be a string containing the characters representing an
           * int or double that wasn't handled above. This would be a string
           * like "27" or "1.0" that is non-zero and not "1". Such a string
           * would result in the boolean value true. We try converting to
           * double. If that succeeds and the resulting double is non-zero, we
           * have a "true". Note that numbers can't have embedded NULLs.
           */
          
          dbl = strtod(string, &end);
          if (end == string) {
            goto badBoolean;
          }
          
          /*
           * Make sure the string has no garbage after the end of the double.
           */
          
          while ((end < (string+length))
               && isspace(UCHAR(*end))) { /* INTL: ISO only */
            end++;
          }
          if (end != (string+length)) {
            goto badBoolean;
          }
          newBool = (dbl != 0.0);
      }
    }

    /*
     * Free the old internalRep before setting the new one. We do this as
     * late as possible to allow the conversion code, in particular
     * Tcl_GetStringFromObj, to use that old internalRep.
     */

    goodBoolean:
    if ((oldTypePtr != NULL) &&     (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }

    objPtr->internalRep.longValue = newBool;
    objPtr->typePtr = &tclBooleanType;
    return TCL_OK;

    badBoolean:
    if (interp != NULL) {
      /*
       * Must copy string before resetting the result in case a caller
       * is trying to convert the interpreter's result to a boolean.
       */
      
      char buf[100];
      sprintf(buf, "expected boolean value but got \"%.50s\"", string);
      Tcl_ResetResult(interp);
      Tcl_AppendToObj(Tcl_GetObjResult(interp), buf, -1);
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfBoolean --
 *
 *    Update the string representation for a boolean object.
 *    Note: This procedure does not free an existing old string rep
 *    so storage will be lost if this has not already been done. 
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's string is set to a valid string that results from
 *    the boolean-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfBoolean(objPtr)
    register Tcl_Obj *objPtr; /* Int object whose string rep to update. */
{
    char *s = ckalloc((unsigned) 2);
    
    s[0] = (char) (objPtr->internalRep.longValue? '1' : '0');
    s[1] = '\0';
    objPtr->bytes = s;
    objPtr->length = 1;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewDoubleObj --
 *
 *    This procedure is normally called when not debugging: i.e., when
 *    TCL_MEM_DEBUG is not defined. It creates a new double object and
 *    initializes it from the argument double value.
 *
 *    When TCL_MEM_DEBUG is defined, this procedure just returns the
 *    result of calling the debugging version Tcl_DbNewDoubleObj.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewDoubleObj

Tcl_Obj *
Tcl_NewDoubleObj(dblValue)
    register double dblValue; /* Double used to initialize the object. */
{
    return Tcl_DbNewDoubleObj(dblValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewDoubleObj(dblValue)
    register double dblValue; /* Double used to initialize the object. */
{
    register Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.doubleValue = dblValue;
    objPtr->typePtr = &tclDoubleType;
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewDoubleObj --
 *
 *    This procedure is normally called when debugging: i.e., when
 *    TCL_MEM_DEBUG is defined. It creates new double objects. It is the
 *    same as the Tcl_NewDoubleObj procedure above except that it calls
 *    Tcl_DbCkalloc directly with the file name and line number from its
 *    caller. This simplifies debugging since then the [memory active]
 *    command     will report the correct file name and line number when
 *    reporting objects that haven't been freed.
 *
 *    When TCL_MEM_DEBUG is not defined, this procedure just returns the
 *    result of calling Tcl_NewDoubleObj.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewDoubleObj(dblValue, file, line)
    register double dblValue; /* Double used to initialize the object. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.doubleValue = dblValue;
    objPtr->typePtr = &tclDoubleType;
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewDoubleObj(dblValue, file, line)
    register double dblValue; /* Double used to initialize the object. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    return Tcl_NewDoubleObj(dblValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetDoubleObj --
 *
 *    Modify an object to be a double object and to have the specified
 *    double value.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's old string rep, if any, is freed. Also, any old
 *    internal rep is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetDoubleObj(objPtr, dblValue)
    register Tcl_Obj *objPtr; /* Object whose internal rep to init. */
    register double dblValue; /* Double used to set the object's value. */
{
    register Tcl_ObjType *oldTypePtr = objPtr->typePtr;

    if (Tcl_IsShared(objPtr)) {
      panic("Tcl_SetDoubleObj called with shared object");
    }

    if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.doubleValue = dblValue;
    objPtr->typePtr = &tclDoubleType;
    Tcl_InvalidateStringRep(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetDoubleFromObj --
 *
 *    Attempt to return a double from the Tcl object "objPtr". If the
 *    object is not already a double, an attempt will be made to convert
 *    it to one.
 *
 * Results:
 *    The return value is a standard Tcl object result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If the object is not already a double, the conversion will free
 *    any old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetDoubleFromObj(interp, objPtr, dblPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object from which to get a double. */
    register double *dblPtr;  /* Place to store resulting double. */
{
    register int result;
    
    if (objPtr->typePtr == &tclDoubleType) {
      *dblPtr = objPtr->internalRep.doubleValue;
      return TCL_OK;
    }

    result = SetDoubleFromAny(interp, objPtr);
    if (result == TCL_OK) {
      *dblPtr = objPtr->internalRep.doubleValue;
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * SetDoubleFromAny --
 *
 *    Attempt to generate an double-precision floating point internal form
 *    for the Tcl object "objPtr".
 *
 * Results:
 *    The return value is a standard Tcl object result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If no error occurs, a double is stored as "objPtr"s internal
 *    representation.
 *
 *----------------------------------------------------------------------
 */

static int
SetDoubleFromAny(interp, objPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object to convert. */
{
    Tcl_ObjType *oldTypePtr = objPtr->typePtr;
    char *string, *end;
    double newDouble;
    int length;

    /*
     * Get the string representation. Make it up-to-date if necessary.
     */

    string = Tcl_GetStringFromObj(objPtr, &length);

    /*
     * Now parse "objPtr"s string as an double. Numbers can't have embedded
     * NULLs. We use an implementation here that doesn't report errors in
     * interp if interp is NULL.
     */

    errno = 0;
    newDouble = strtod(string, &end);
    if (end == string) {
      badDouble:
      if (interp != NULL) {
          /*
           * Must copy string before resetting the result in case a caller
           * is trying to convert the interpreter's result to an int.
           */
          
          char buf[100];
          sprintf(buf, "expected floating-point number but got \"%.50s\"",
                  string);
          Tcl_ResetResult(interp);
          Tcl_AppendToObj(Tcl_GetObjResult(interp), buf, -1);
      }
      return TCL_ERROR;
    }
    if (errno != 0) {
      if (interp != NULL) {
          TclExprFloatError(interp, newDouble);
      }
      return TCL_ERROR;
    }

    /*
     * Make sure that the string has no garbage after the end of the double.
     */
    
    while ((end < (string+length))
          && isspace(UCHAR(*end))) { /* INTL: ISO space. */
      end++;
    }
    if (end != (string+length)) {
      goto badDouble;
    }
    
    /*
     * The conversion to double succeeded. Free the old internalRep before
     * setting the new one. We do this as late as possible to allow the
     * conversion code, in particular Tcl_GetStringFromObj, to use that old
     * internalRep.
     */
    
    if ((oldTypePtr != NULL) &&     (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }

    objPtr->internalRep.doubleValue = newDouble;
    objPtr->typePtr = &tclDoubleType;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfDouble --
 *
 *    Update the string representation for a double-precision floating
 *    point object. This must obey the current tcl_precision value for
 *    double-to-string conversions. Note: This procedure does not free an
 *    existing old string rep so storage will be lost if this has not
 *    already been done.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's string is set to a valid string that results from
 *    the double-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfDouble(objPtr)
    register Tcl_Obj *objPtr; /* Double obj with string rep to update. */
{
    char buffer[TCL_DOUBLE_SPACE];
    register int len;
    
    Tcl_PrintDouble((Tcl_Interp *) NULL, objPtr->internalRep.doubleValue,
          buffer);
    len = strlen(buffer);
    
    objPtr->bytes = (char *) ckalloc((unsigned) len + 1);
    strcpy(objPtr->bytes, buffer);
    objPtr->length = len;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewIntObj --
 *
 *    If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *    Tcl_NewIntObj to create a new integer object end up calling the
 *    debugging procedure Tcl_DbNewLongObj instead.
 *
 *    Otherwise, if the client is compiled without TCL_MEM_DEBUG defined,
 *    calls to Tcl_NewIntObj result in a call to one of the two
 *    Tcl_NewIntObj implementations below. We provide two implementations
 *    so that the Tcl core can be compiled to do memory debugging of the 
 *    core even if a client does not request it for itself.
 *
 *    Integer and long integer objects share the same "integer" type
 *    implementation. We store all integers as longs and Tcl_GetIntFromObj
 *    checks whether the current value of the long can be represented by
 *    an int.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewIntObj

Tcl_Obj *
Tcl_NewIntObj(intValue)
    register int intValue;    /* Int used to initialize the new object. */
{
    return Tcl_DbNewLongObj((long)intValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewIntObj(intValue)
    register int intValue;    /* Int used to initialize the new object. */
{
    register Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.longValue = (long)intValue;
    objPtr->typePtr = &tclIntType;
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetIntObj --
 *
 *    Modify an object to be an integer and to have the specified integer
 *    value.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's old string rep, if any, is freed. Also, any old
 *    internal rep is freed. 
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetIntObj(objPtr, intValue)
    register Tcl_Obj *objPtr; /* Object whose internal rep to init. */
    register int intValue;    /* Integer used to set object's value. */
{
    register Tcl_ObjType *oldTypePtr = objPtr->typePtr;

    if (Tcl_IsShared(objPtr)) {
      panic("Tcl_SetIntObj called with shared object");
    }
    
    if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.longValue = (long) intValue;
    objPtr->typePtr = &tclIntType;
    Tcl_InvalidateStringRep(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetIntFromObj --
 *
 *    Attempt to return an int from the Tcl object "objPtr". If the object
 *    is not already an int, an attempt will be made to convert it to one.
 *
 *    Integer and long integer objects share the same "integer" type
 *    implementation. We store all integers as longs and Tcl_GetIntFromObj
 *    checks whether the current value of the long can be represented by
 *    an int.
 *
 * Results:
 *    The return value is a standard Tcl object result. If an error occurs
 *    during conversion or if the long integer held by the object
 *    can not be represented by an int, an error message is left in
 *    the interpreter's result unless "interp" is NULL.
 *
 * Side effects:
 *    If the object is not already an int, the conversion will free
 *    any old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetIntFromObj(interp, objPtr, intPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object from which to get a int. */
    register int *intPtr;     /* Place to store resulting int. */
{
    int result;
    Tcl_WideInt w = 0;

    /*
     * If the object isn't already an integer of any width, try to
     * convert it to one.
     */

    if (objPtr->typePtr != &tclIntType && objPtr->typePtr != &tclWideIntType) {
      result = SetIntOrWideFromAny(interp, objPtr);
      if (result != TCL_OK) {
          return result;
      }
    }

    /*
     * Object should now be either int or wide. Get its value.
     */

#ifndef TCL_WIDE_INT_IS_LONG
    if (objPtr->typePtr == &tclWideIntType) {
      w = objPtr->internalRep.wideValue;
    } else
#endif
    {
      w = Tcl_LongAsWide(objPtr->internalRep.longValue);
    }

    if ((LLONG_MAX > UINT_MAX)
          && ((w > UINT_MAX) || (w < -(Tcl_WideInt)UINT_MAX))) {
      if (interp != NULL) {
          Tcl_SetObjResult(interp, Tcl_NewStringObj(
            "integer value too large to represent as non-long integer",
            -1));
      }
      return TCL_ERROR;
    }
    *intPtr = (int)w;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * SetIntFromAny --
 *
 *    Attempts to force the internal representation for a Tcl object
 *    to tclIntType, specifically.
 *
 * Results:
 *    The return value is a standard object Tcl result.  If an
 *    error occurs during conversion, an error message is left in
 *    the interpreter's result unless "interp" is NULL.
 *
 *----------------------------------------------------------------------
 */

static int
SetIntFromAny( Tcl_Interp* interp, 
                        /* Tcl interpreter */
             Tcl_Obj* objPtr )
                        /* Pointer to the object to convert */
{
    int result;

    result = SetIntOrWideFromAny( interp, objPtr );
    if ( result != TCL_OK ) {
      return result;
    }
    if ( objPtr->typePtr != &tclIntType ) {
      if ( interp != NULL ) {
          char *s = "integer value too large to represent";
          Tcl_ResetResult(interp);
          Tcl_AppendToObj(Tcl_GetObjResult(interp), s, -1);
          Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW", s, (char *) NULL);
      }
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * SetIntOrWideFromAny --
 *
 *    Attempt to generate an integer internal form for the Tcl object
 *    "objPtr".
 *
 * Results:
 *    The return value is a standard object Tcl result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If no error occurs, an int is stored as "objPtr"s internal
 *    representation. 
 *
 *----------------------------------------------------------------------
 */

static int
SetIntOrWideFromAny(interp, objPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object to convert. */
{
    Tcl_ObjType *oldTypePtr = objPtr->typePtr;
    char *string, *end;
    int length;
    register char *p;
    unsigned long newLong;
    int isNegative = 0;
    int isWide = 0;

    /*
     * Get the string representation. Make it up-to-date if necessary.
     */

    p = string = Tcl_GetStringFromObj(objPtr, &length);

    /*
     * Now parse "objPtr"s string as an int. We use an implementation here
     * that doesn't report errors in interp if interp is NULL. Note: use
     * strtoul instead of strtol for integer conversions to allow full-size
     * unsigned numbers, but don't depend on strtoul to handle sign
     * characters; it won't in some implementations.
     */

    errno = 0;
    for ( ;  isspace(UCHAR(*p));  p++) { /* INTL: ISO space. */
      /* Empty loop body. */
    }
    if (*p == '-') {
      p++;
      isNegative = 1;
    } else if (*p == '+') {
      p++;
    }
    if (!isdigit(UCHAR(*p))) {
      badInteger:
      if (interp != NULL) {
          /*
           * Must copy string before resetting the result in case a caller
           * is trying to convert the interpreter's result to an int.
           */
          
          char buf[100];
          sprintf(buf, "expected integer but got \"%.50s\"", string);
          Tcl_ResetResult(interp);
          Tcl_AppendToObj(Tcl_GetObjResult(interp), buf, -1);
          TclCheckBadOctal(interp, string);
      }
      return TCL_ERROR;
    }
    newLong = strtoul(p, &end, 0);
    if (end == p) {
      goto badInteger;
    }
    if (errno == ERANGE) {
      if (interp != NULL) {
          char *s = "integer value too large to represent";
          Tcl_ResetResult(interp);
          Tcl_AppendToObj(Tcl_GetObjResult(interp), s, -1);
          Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW", s, (char *) NULL);
      }
      return TCL_ERROR;
    }

    /*
     * Make sure that the string has no garbage after the end of the int.
     */
    
    while ((end < (string+length))
          && isspace(UCHAR(*end))) { /* INTL: ISO space. */
      end++;
    }
    if (end != (string+length)) {
      goto badInteger;
    }

    /*
     * If the resulting integer will exceed the range of a long,
     * put it into a wide instead.  (Tcl Bug #868489)
     */

#ifndef TCL_WIDE_INT_IS_LONG
    if ((isNegative && newLong > (unsigned long) (LONG_MAX) + 1)
          || (!isNegative && newLong > LONG_MAX)) {
      isWide = 1;
    }
#endif

    /*
     * The conversion to int succeeded. Free the old internalRep before
     * setting the new one. We do this as late as possible to allow the
     * conversion code, in particular Tcl_GetStringFromObj, to use that old
     * internalRep.
     */

    if ((oldTypePtr != NULL) &&     (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }

    if (isWide) {
      objPtr->internalRep.wideValue =
            (isNegative ? -(Tcl_WideInt)newLong : (Tcl_WideInt)newLong);
      objPtr->typePtr = &tclWideIntType;
    } else {
      objPtr->internalRep.longValue =
            (isNegative ? -(long)newLong : (long)newLong);
      objPtr->typePtr = &tclIntType;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfInt --
 *
 *    Update the string representation for an integer object.
 *    Note: This procedure does not free an existing old string rep
 *    so storage will be lost if this has not already been done. 
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's string is set to a valid string that results from
 *    the int-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfInt(objPtr)
    register Tcl_Obj *objPtr; /* Int object whose string rep to update. */
{
    char buffer[TCL_INTEGER_SPACE];
    register int len;
    
    len = TclFormatInt(buffer, objPtr->internalRep.longValue);
    
    objPtr->bytes = ckalloc((unsigned) len + 1);
    strcpy(objPtr->bytes, buffer);
    objPtr->length = len;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewLongObj --
 *
 *    If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *    Tcl_NewLongObj to create a new long integer object end up calling
 *    the debugging procedure Tcl_DbNewLongObj instead.
 *
 *    Otherwise, if the client is compiled without TCL_MEM_DEBUG defined,
 *    calls to Tcl_NewLongObj result in a call to one of the two
 *    Tcl_NewLongObj implementations below. We provide two implementations
 *    so that the Tcl core can be compiled to do memory debugging of the 
 *    core even if a client does not request it for itself.
 *
 *    Integer and long integer objects share the same "integer" type
 *    implementation. We store all integers as longs and Tcl_GetIntFromObj
 *    checks whether the current value of the long can be represented by
 *    an int.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewLongObj

Tcl_Obj *
Tcl_NewLongObj(longValue)
    register long longValue;  /* Long integer used to initialize the
                         * new object. */
{
    return Tcl_DbNewLongObj(longValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewLongObj(longValue)
    register long longValue;  /* Long integer used to initialize the
                         * new object. */
{
    register Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.longValue = longValue;
    objPtr->typePtr = &tclIntType;
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewLongObj --
 *
 *    If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *    Tcl_NewIntObj and Tcl_NewLongObj to create new integer or
 *    long integer objects end up calling the debugging procedure
 *    Tcl_DbNewLongObj instead. We provide two implementations of
 *    Tcl_DbNewLongObj so that whether the Tcl core is compiled to do
 *    memory debugging of the core is independent of whether a client
 *    requests debugging for itself.
 *
 *    When the core is compiled with TCL_MEM_DEBUG defined,
 *    Tcl_DbNewLongObj calls Tcl_DbCkalloc directly with the file name and
 *    line number from its caller. This simplifies debugging since then
 *    the [memory active] command will report the caller's file name and
 *    line number when reporting objects that haven't been freed.
 *
 *    Otherwise, when the core is compiled without TCL_MEM_DEBUG defined,
 *    this procedure just returns the result of calling Tcl_NewLongObj.
 *
 * Results:
 *    The newly created long integer object is returned. This object
 *    will have an invalid string representation. The returned object has
 *    ref count 0.
 *
 * Side effects:
 *    Allocates memory.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewLongObj(longValue, file, line)
    register long longValue;  /* Long integer used to initialize the
                         * new object. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.longValue = longValue;
    objPtr->typePtr = &tclIntType;
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewLongObj(longValue, file, line)
    register long longValue;  /* Long integer used to initialize the
                         * new object. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
    return Tcl_NewLongObj(longValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetLongObj --
 *
 *    Modify an object to be an integer object and to have the specified
 *    long integer value.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's old string rep, if any, is freed. Also, any old
 *    internal rep is freed. 
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetLongObj(objPtr, longValue)
    register Tcl_Obj *objPtr; /* Object whose internal rep to init. */
    register long longValue;  /* Long integer used to initialize the
                         * object's value. */
{
    register Tcl_ObjType *oldTypePtr = objPtr->typePtr;

    if (Tcl_IsShared(objPtr)) {
      panic("Tcl_SetLongObj called with shared object");
    }

    if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.longValue = longValue;
    objPtr->typePtr = &tclIntType;
    Tcl_InvalidateStringRep(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetLongFromObj --
 *
 *    Attempt to return an long integer from the Tcl object "objPtr". If
 *    the object is not already an int object, an attempt will be made to
 *    convert it to one.
 *
 * Results:
 *    The return value is a standard Tcl object result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If the object is not already an int object, the conversion will free
 *    any old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetLongFromObj(interp, objPtr, longPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object from which to get a long. */
    register long *longPtr;   /* Place to store resulting long. */
{
    register int result;
    
    if (objPtr->typePtr != &tclIntType && objPtr->typePtr != &tclWideIntType) {
      result = SetIntOrWideFromAny(interp, objPtr);
      if (result != TCL_OK) {
          return result;
      }
    }

#ifndef TCL_WIDE_INT_IS_LONG
    if (objPtr->typePtr == &tclWideIntType) {
      /*
       * If the object is already a wide integer, don't convert it.
       * This code allows for any integer in the range -ULONG_MAX to
       * ULONG_MAX to be converted to a long, ignoring overflow.
       * The rule preserves existing semantics for conversion of
       * integers on input, but avoids inadvertent demotion of
       * wide integers to 32-bit ones in the internal rep.
       */

      Tcl_WideInt w = objPtr->internalRep.wideValue;
      if (w >= -(Tcl_WideInt)(ULONG_MAX) && w <= (Tcl_WideInt)(ULONG_MAX)) {
          *longPtr = Tcl_WideAsLong(w);
          return TCL_OK;
      } else {
          if (interp != NULL) {
            Tcl_ResetResult(interp);
            Tcl_AppendToObj(Tcl_GetObjResult(interp),
                  "integer value too large to represent", -1);
          }
          return TCL_ERROR;
      }
    }
#endif

    *longPtr = objPtr->internalRep.longValue;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * SetWideIntFromAny --
 *
 *    Attempt to generate an integer internal form for the Tcl object
 *    "objPtr".
 *
 * Results:
 *    The return value is a standard object Tcl result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If no error occurs, an int is stored as "objPtr"s internal
 *    representation. 
 *
 *----------------------------------------------------------------------
 */

static int
SetWideIntFromAny(interp, objPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object to convert. */
{
#ifndef TCL_WIDE_INT_IS_LONG
    Tcl_ObjType *oldTypePtr = objPtr->typePtr;
    char *string, *end;
    int length;
    register char *p;
    Tcl_WideInt newWide;

    /*
     * Get the string representation. Make it up-to-date if necessary.
     */

    p = string = Tcl_GetStringFromObj(objPtr, &length);

    /*
     * Now parse "objPtr"s string as an int. We use an implementation here
     * that doesn't report errors in interp if interp is NULL. Note: use
     * strtoull instead of strtoll for integer conversions to allow full-size
     * unsigned numbers, but don't depend on strtoull to handle sign
     * characters; it won't in some implementations.
     */

    errno = 0;
#ifdef TCL_STRTOUL_SIGN_CHECK
    for ( ;  isspace(UCHAR(*p));  p++) { /* INTL: ISO space. */
      /* Empty loop body. */
    }
    if (*p == '-') {
      p++;
      newWide = -((Tcl_WideInt)strtoull(p, &end, 0));
    } else if (*p == '+') {
      p++;
      newWide = strtoull(p, &end, 0);
    } else
#else
      newWide = strtoull(p, &end, 0);
#endif
    if (end == p) {
      badInteger:
      if (interp != NULL) {
          /*
           * Must copy string before resetting the result in case a caller
           * is trying to convert the interpreter's result to an int.
           */
          
          char buf[100];
          sprintf(buf, "expected integer but got \"%.50s\"", string);
          Tcl_ResetResult(interp);
          Tcl_AppendToObj(Tcl_GetObjResult(interp), buf, -1);
          TclCheckBadOctal(interp, string);
      }
      return TCL_ERROR;
    }
    if (errno == ERANGE) {
      if (interp != NULL) {
          char *s = "integer value too large to represent";
          Tcl_ResetResult(interp);
          Tcl_AppendToObj(Tcl_GetObjResult(interp), s, -1);
          Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW", s, (char *) NULL);
      }
      return TCL_ERROR;
    }

    /*
     * Make sure that the string has no garbage after the end of the int.
     */
    
    while ((end < (string+length))
          && isspace(UCHAR(*end))) { /* INTL: ISO space. */
      end++;
    }
    if (end != (string+length)) {
      goto badInteger;
    }

    /*
     * The conversion to int succeeded. Free the old internalRep before
     * setting the new one. We do this as late as possible to allow the
     * conversion code, in particular Tcl_GetStringFromObj, to use that old
     * internalRep.
     */

    if ((oldTypePtr != NULL) &&     (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.wideValue = newWide;
#else 
    if (TCL_ERROR == SetIntFromAny(interp, objPtr)) {
      return TCL_ERROR;
    }
#endif
    objPtr->typePtr = &tclWideIntType;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfWideInt --
 *
 *    Update the string representation for a wide integer object.
 *    Note: This procedure does not free an existing old string rep
 *    so storage will be lost if this has not already been done. 
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's string is set to a valid string that results from
 *    the wideInt-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

#ifndef TCL_WIDE_INT_IS_LONG
static void
UpdateStringOfWideInt(objPtr)
    register Tcl_Obj *objPtr; /* Int object whose string rep to update. */
{
    char buffer[TCL_INTEGER_SPACE+2];
    register unsigned len;
    register Tcl_WideInt wideVal = objPtr->internalRep.wideValue;

    /*
     * Note that sprintf will generate a compiler warning under
     * Mingw claiming %I64 is an unknown format specifier.
     * Just ignore this warning. We can't use %L as the format
     * specifier since that gets printed as a 32 bit value.
     */
    sprintf(buffer, "%" TCL_LL_MODIFIER "d", wideVal);
    len = strlen(buffer);
    objPtr->bytes = ckalloc((unsigned) len + 1);
    memcpy(objPtr->bytes, buffer, len + 1);
    objPtr->length = len;
}
#endif /* TCL_WIDE_INT_IS_LONG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewWideIntObj --
 *
 *    If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *    Tcl_NewWideIntObj to create a new 64-bit integer object end up calling
 *    the debugging procedure Tcl_DbNewWideIntObj instead.
 *
 *    Otherwise, if the client is compiled without TCL_MEM_DEBUG defined,
 *    calls to Tcl_NewWideIntObj result in a call to one of the two
 *    Tcl_NewWideIntObj implementations below. We provide two implementations
 *    so that the Tcl core can be compiled to do memory debugging of the 
 *    core even if a client does not request it for itself.
 *
 * Results:
 *    The newly created object is returned. This object will have an
 *    invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewWideIntObj

Tcl_Obj *
Tcl_NewWideIntObj(wideValue)
    register Tcl_WideInt wideValue; /* Wide integer used to initialize
                               * the new object. */
{
    return Tcl_DbNewWideIntObj(wideValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewWideIntObj(wideValue)
    register Tcl_WideInt wideValue; /* Wide integer used to initialize
                               * the new object. */
{
    register Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.wideValue = wideValue;
    objPtr->typePtr = &tclWideIntType;
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewWideIntObj --
 *
 *    If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *    Tcl_NewWideIntObj to create new wide integer end up calling
 *    the debugging procedure Tcl_DbNewWideIntObj instead. We
 *    provide two implementations of Tcl_DbNewWideIntObj so that
 *    whether the Tcl core is compiled to do memory debugging of the
 *    core is independent of whether a client requests debugging for
 *    itself.
 *
 *    When the core is compiled with TCL_MEM_DEBUG defined,
 *    Tcl_DbNewWideIntObj calls Tcl_DbCkalloc directly with the file
 *    name and line number from its caller. This simplifies
 *    debugging since then the checkmem command will report the
 *    caller's file name and line number when reporting objects that
 *    haven't been freed.
 *
 *    Otherwise, when the core is compiled without TCL_MEM_DEBUG defined,
 *    this procedure just returns the result of calling Tcl_NewWideIntObj.
 *
 * Results:
 *    The newly created wide integer object is returned. This object
 *    will have an invalid string representation. The returned object has
 *    ref count 0.
 *
 * Side effects:
 *    Allocates memory.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewWideIntObj(wideValue, file, line)
    register Tcl_WideInt wideValue; /* Wide integer used to initialize
                               * the new object. */
    CONST char *file;               /* The name of the source file
                               * calling this procedure; used for
                               * debugging. */
    int line;                       /* Line number in the source file;
                               * used for debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    objPtr->bytes = NULL;
    
    objPtr->internalRep.wideValue = wideValue;
    objPtr->typePtr = &tclWideIntType;
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewWideIntObj(wideValue, file, line)
    register Tcl_WideInt wideValue; /* Long integer used to initialize
                               * the new object. */
    CONST char *file;               /* The name of the source file
                               * calling this procedure; used for
                               * debugging. */
    int line;                       /* Line number in the source file;
                               * used for debugging. */
{
    return Tcl_NewWideIntObj(wideValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetWideIntObj --
 *
 *    Modify an object to be a wide integer object and to have the
 *    specified wide integer value.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's old string rep, if any, is freed. Also, any old
 *    internal rep is freed. 
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetWideIntObj(objPtr, wideValue)
    register Tcl_Obj *objPtr;       /* Object w. internal rep to init. */
    register Tcl_WideInt wideValue; /* Wide integer used to initialize
                               * the object's value. */
{
    register Tcl_ObjType *oldTypePtr = objPtr->typePtr;

    if (Tcl_IsShared(objPtr)) {
      panic("Tcl_SetWideIntObj called with shared object");
    }

    if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.wideValue = wideValue;
    objPtr->typePtr = &tclWideIntType;
    Tcl_InvalidateStringRep(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetWideIntFromObj --
 *
 *    Attempt to return a wide integer from the Tcl object "objPtr". If
 *    the object is not already a wide int object, an attempt will be made
 *    to convert it to one.
 *
 * Results:
 *    The return value is a standard Tcl object result. If an error occurs
 *    during conversion, an error message is left in the interpreter's
 *    result unless "interp" is NULL.
 *
 * Side effects:
 *    If the object is not already an int object, the conversion will free
 *    any old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetWideIntFromObj(interp, objPtr, wideIntPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* Object from which to get a wide int. */
    register Tcl_WideInt *wideIntPtr; /* Place to store resulting long. */
{
    register int result;

    if (objPtr->typePtr == &tclWideIntType) {
    gotWide:
      *wideIntPtr = objPtr->internalRep.wideValue;
      return TCL_OK;
    }
    if (objPtr->typePtr == &tclIntType) {
      /*
       * This cast is safe; all valid ints/longs are wides.
       */

      objPtr->internalRep.wideValue =
            Tcl_LongAsWide(objPtr->internalRep.longValue);
      objPtr->typePtr = &tclWideIntType;
      goto gotWide;
    }
    result = SetWideIntFromAny(interp, objPtr);
    if (result == TCL_OK) {
      *wideIntPtr = objPtr->internalRep.wideValue;
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbIncrRefCount --
 *
 *    This procedure is normally called when debugging: i.e., when
 *    TCL_MEM_DEBUG is defined. This checks to see whether or not
 *    the memory has been freed before incrementing the ref count.
 *
 *    When TCL_MEM_DEBUG is not defined, this procedure just increments
 *    the reference count of the object.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's ref count is incremented.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DbIncrRefCount(objPtr, file, line)
    register Tcl_Obj *objPtr; /* The object we are registering a
                         * reference to. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
#ifdef TCL_MEM_DEBUG
    if (objPtr->refCount == 0x61616161) {
      fprintf(stderr, "file = %s, line = %d\n", file, line);
      fflush(stderr);
      panic("Trying to increment refCount of previously disposed object.");
    }
#endif
    ++(objPtr)->refCount;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbDecrRefCount --
 *
 *    This procedure is normally called when debugging: i.e., when
 *    TCL_MEM_DEBUG is defined. This checks to see whether or not
 *    the memory has been freed before decrementing the ref count.
 *
 *    When TCL_MEM_DEBUG is not defined, this procedure just decrements
 *    the reference count of the object.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's ref count is incremented.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DbDecrRefCount(objPtr, file, line)
    register Tcl_Obj *objPtr; /* The object we are releasing a reference
                         * to. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
#ifdef TCL_MEM_DEBUG
    if (objPtr->refCount == 0x61616161) {
      fprintf(stderr, "file = %s, line = %d\n", file, line);
      fflush(stderr);
      panic("Trying to decrement refCount of previously disposed object.");
    }
#endif
    if (--(objPtr)->refCount <= 0) {
      TclFreeObj(objPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbIsShared --
 *
 *    This procedure is normally called when debugging: i.e., when
 *    TCL_MEM_DEBUG is defined. It tests whether the object has a ref
 *    count greater than one.
 *
 *    When TCL_MEM_DEBUG is not defined, this procedure just tests
 *    if the object has a ref count greater than one.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_DbIsShared(objPtr, file, line)
    register Tcl_Obj *objPtr; /* The object to test for being shared. */
    CONST char *file;         /* The name of the source file calling this
                         * procedure; used for debugging. */
    int line;                 /* Line number in the source file; used
                         * for debugging. */
{
#ifdef TCL_MEM_DEBUG
    if (objPtr->refCount == 0x61616161) {
      fprintf(stderr, "file = %s, line = %d\n", file, line);
      fflush(stderr);
      panic("Trying to check whether previously disposed object is shared.");
    }
#endif
#ifdef TCL_COMPILE_STATS
    Tcl_MutexLock(&tclObjMutex);
    if ((objPtr)->refCount <= 1) {
      tclObjsShared[1]++;
    } else if ((objPtr)->refCount < TCL_MAX_SHARED_OBJ_STATS) {
      tclObjsShared[(objPtr)->refCount]++;
    } else {
      tclObjsShared[0]++;
    }
    Tcl_MutexUnlock(&tclObjMutex);
#endif
    return ((objPtr)->refCount > 1);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitObjHashTable --
 *
 *    Given storage for a hash table, set up the fields to prepare
 *    the hash table for use, the keys are Tcl_Obj *.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    TablePtr is now ready to be passed to Tcl_FindHashEntry and
 *    Tcl_CreateHashEntry.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_InitObjHashTable(tablePtr)
    register Tcl_HashTable *tablePtr;     /* Pointer to table record, which
                               * is supplied by the caller. */
{
    Tcl_InitCustomHashTable(tablePtr, TCL_CUSTOM_PTR_KEYS,
          &tclObjHashKeyType);
}

/*
 *----------------------------------------------------------------------
 *
 * AllocObjEntry --
 *
 *    Allocate space for a Tcl_HashEntry containing the Tcl_Obj * key.
 *
 * Results:
 *    The return value is a pointer to the created entry.
 *
 * Side effects:
 *    Increments the reference count on the object.
 *
 *----------------------------------------------------------------------
 */

static Tcl_HashEntry *
AllocObjEntry(tablePtr, keyPtr)
    Tcl_HashTable *tablePtr;  /* Hash table. */
    VOID *keyPtr;       /* Key to store in the hash table entry. */
{
    Tcl_Obj *objPtr = (Tcl_Obj *) keyPtr;
    Tcl_HashEntry *hPtr;

    hPtr = (Tcl_HashEntry *) ckalloc((unsigned) (sizeof(Tcl_HashEntry)));
    hPtr->key.oneWordValue = (char *) objPtr;
    Tcl_IncrRefCount (objPtr);

    return hPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * CompareObjKeys --
 *
 *    Compares two Tcl_Obj * keys.
 *
 * Results:
 *    The return value is 0 if they are different and 1 if they are
 *    the same.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static int
CompareObjKeys(keyPtr, hPtr)
    VOID *keyPtr;       /* New key to compare. */
    Tcl_HashEntry *hPtr;            /* Existing key to compare. */
{
    Tcl_Obj *objPtr1 = (Tcl_Obj *) keyPtr;
    Tcl_Obj *objPtr2 = (Tcl_Obj *) hPtr->key.oneWordValue;
    register CONST char *p1, *p2;
    register int l1, l2;

    /*
     * If the object pointers are the same then they match.
     */
    if (objPtr1 == objPtr2) {
      return 1;
    }

    /*
     * Don't use Tcl_GetStringFromObj as it would prevent l1 and l2 being
     * in a register.
     */
    p1 = TclGetString(objPtr1);
    l1 = objPtr1->length;
    p2 = TclGetString(objPtr2);
    l2 = objPtr2->length;
    
    /*
     * Only compare if the string representations are of the same length.
     */
    if (l1 == l2) {
      for (;; p1++, p2++, l1--) {
          if (*p1 != *p2) {
            break;
          }
          if (l1 == 0) {
            return 1;
          }
      }
    }

    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeObjEntry --
 *
 *    Frees space for a Tcl_HashEntry containing the Tcl_Obj * key.
 *
 * Results:
 *    The return value is a pointer to the created entry.
 *
 * Side effects:
 *    Decrements the reference count of the object.
 *
 *----------------------------------------------------------------------
 */

static void
FreeObjEntry(hPtr)
    Tcl_HashEntry *hPtr;      /* Hash entry to free. */
{
    Tcl_Obj *objPtr = (Tcl_Obj *) hPtr->key.oneWordValue;

    Tcl_DecrRefCount (objPtr);
    ckfree ((char *) hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * HashObjKey --
 *
 *    Compute a one-word summary of the string representation of the
 *    Tcl_Obj, which can be used to generate a hash index.
 *
 * Results:
 *    The return value is a one-word summary of the information in
 *    the string representation of the Tcl_Obj.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static unsigned int
HashObjKey(tablePtr, keyPtr)
    Tcl_HashTable *tablePtr;  /* Hash table. */
    VOID *keyPtr;       /* Key from which to compute hash value. */
{
    Tcl_Obj *objPtr = (Tcl_Obj *) keyPtr;
    CONST char *string = TclGetString(objPtr);
    int length = objPtr->length;
    unsigned int result;
    int i;

    /*
     * I tried a zillion different hash functions and asked many other
     * people for advice.  Many people had their own favorite functions,
     * all different, but no-one had much idea why they were good ones.
     * I chose the one below (multiply by 9 and add new character)
     * because of the following reasons:
     *
     * 1. Multiplying by 10 is perfect for keys that are decimal strings,
     *    and multiplying by 9 is just about as good.
     * 2. Times-9 is (shift-left-3) plus (old).  This means that each
     *    character's bits hang around in the low-order bits of the
     *    hash value for ever, plus they spread fairly rapidly up to
     *    the high-order bits to fill out the hash value.  This seems
     *    works well both for decimal and non-decimal strings.
     */

    result = 0;
    for (i=0 ; i<length ; i++) {
      result += (result<<3) + string[i];
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCommandFromObj --
 *
 *      Returns the command specified by the name in a Tcl_Obj.
 *
 * Results:
 *    Returns a token for the command if it is found. Otherwise, if it
 *    can't be found or there is an error, returns NULL.
 *
 * Side effects:
 *      May update the internal representation for the object, caching
 *      the command reference so that the next time this procedure is
 *    called with the same object, the command can be found quickly.
 *
 *----------------------------------------------------------------------
 */

Tcl_Command
Tcl_GetCommandFromObj(interp, objPtr)
    Tcl_Interp *interp;       /* The interpreter in which to resolve the
                         * command and to report errors. */
    register Tcl_Obj *objPtr; /* The object containing the command's
                         * name. If the name starts with "::", will
                         * be looked up in global namespace. Else,
                         * looked up first in the current namespace,
                         * then in global namespace. */
{
    Interp *iPtr = (Interp *) interp;
    register ResolvedCmdName *resPtr;
    register Command *cmdPtr;
    Namespace *currNsPtr;
    int result;
    CallFrame *savedFramePtr;
    char *name;

    /*
     * If the variable name is fully qualified, do as if the lookup were
     * done from the global namespace; this helps avoid repeated lookups 
     * of fully qualified names. It costs close to nothing, and may be very
     * helpful for OO applications which pass along a command name ("this"),
     * [Patch 456668]
     */

    savedFramePtr = iPtr->varFramePtr;
    name = Tcl_GetString(objPtr);
    if ((*name++ == ':') && (*name == ':')) {
      iPtr->varFramePtr = NULL;
    }

    /*
     * Get the internal representation, converting to a command type if
     * needed. The internal representation is a ResolvedCmdName that points
     * to the actual command.
     */
    
    if (objPtr->typePtr != &tclCmdNameType) {
        result = tclCmdNameType.setFromAnyProc(interp, objPtr);
        if (result != TCL_OK) {
          iPtr->varFramePtr = savedFramePtr;
            return (Tcl_Command) NULL;
        }
    }
    resPtr = (ResolvedCmdName *) objPtr->internalRep.twoPtrValue.ptr1;

    /*
     * Get the current namespace.
     */
    
    if (iPtr->varFramePtr != NULL) {
      currNsPtr = iPtr->varFramePtr->nsPtr;
    } else {
      currNsPtr = iPtr->globalNsPtr;
    }

    /*
     * Check the context namespace and the namespace epoch of the resolved
     * symbol to make sure that it is fresh. If not, then force another
     * conversion to the command type, to discard the old rep and create a
     * new one. Note that we verify that the namespace id of the context
     * namespace is the same as the one we cached; this insures that the
     * namespace wasn't deleted and a new one created at the same address
     * with the same command epoch.
     */
    
    cmdPtr = NULL;
    if ((resPtr != NULL)
          && (resPtr->refNsPtr == currNsPtr)
          && (resPtr->refNsId == currNsPtr->nsId)
          && (resPtr->refNsCmdEpoch == currNsPtr->cmdRefEpoch)) {
        cmdPtr = resPtr->cmdPtr;
        if (cmdPtr->cmdEpoch != resPtr->cmdEpoch) {
            cmdPtr = NULL;
        }
    }

    if (cmdPtr == NULL) {
        result = tclCmdNameType.setFromAnyProc(interp, objPtr);
        if (result != TCL_OK) {
          iPtr->varFramePtr = savedFramePtr;
            return (Tcl_Command) NULL;
        }
        resPtr = (ResolvedCmdName *) objPtr->internalRep.twoPtrValue.ptr1;
        if (resPtr != NULL) {
            cmdPtr = resPtr->cmdPtr;
        }
    }
    iPtr->varFramePtr = savedFramePtr;
    return (Tcl_Command) cmdPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclSetCmdNameObj --
 *
 *    Modify an object to be an CmdName object that refers to the argument
 *    Command structure.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The object's old internal rep is freed. It's string rep is not
 *    changed. The refcount in the Command structure is incremented to
 *    keep it from being freed if the command is later deleted until
 *    TclExecuteByteCode has a chance to recognize that it was deleted.
 *
 *----------------------------------------------------------------------
 */

void
TclSetCmdNameObj(interp, objPtr, cmdPtr)
    Tcl_Interp *interp;       /* Points to interpreter containing command
                         * that should be cached in objPtr. */
    register Tcl_Obj *objPtr; /* Points to Tcl object to be changed to
                         * a CmdName object. */
    Command *cmdPtr;          /* Points to Command structure that the
                         * CmdName object should refer to. */
{
    Interp *iPtr = (Interp *) interp;
    register ResolvedCmdName *resPtr;
    Tcl_ObjType *oldTypePtr = objPtr->typePtr;
    register Namespace *currNsPtr;

    if (oldTypePtr == &tclCmdNameType) {
      return;
    }
    
    /*
     * Get the current namespace.
     */
    
    if (iPtr->varFramePtr != NULL) {
      currNsPtr = iPtr->varFramePtr->nsPtr;
    } else {
      currNsPtr = iPtr->globalNsPtr;
    }
    
    cmdPtr->refCount++;
    resPtr = (ResolvedCmdName *) ckalloc(sizeof(ResolvedCmdName));
    resPtr->cmdPtr = cmdPtr;
    resPtr->refNsPtr = currNsPtr;
    resPtr->refNsId  = currNsPtr->nsId;
    resPtr->refNsCmdEpoch = currNsPtr->cmdRefEpoch;
    resPtr->cmdEpoch = cmdPtr->cmdEpoch;
    resPtr->refCount = 1;
    
    if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
      oldTypePtr->freeIntRepProc(objPtr);
    }
    objPtr->internalRep.twoPtrValue.ptr1 = (VOID *) resPtr;
    objPtr->internalRep.twoPtrValue.ptr2 = NULL;
    objPtr->typePtr = &tclCmdNameType;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeCmdNameInternalRep --
 *
 *    Frees the resources associated with a cmdName object's internal
 *    representation.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Decrements the ref count of any cached ResolvedCmdName structure
 *    pointed to by the cmdName's internal representation. If this is 
 *    the last use of the ResolvedCmdName, it is freed. This in turn
 *    decrements the ref count of the Command structure pointed to by 
 *    the ResolvedSymbol, which may free the Command structure.
 *
 *----------------------------------------------------------------------
 */

static void
FreeCmdNameInternalRep(objPtr)
    register Tcl_Obj *objPtr; /* CmdName object with internal
                         * representation to free. */
{
    register ResolvedCmdName *resPtr =
      (ResolvedCmdName *) objPtr->internalRep.twoPtrValue.ptr1;

    if (resPtr != NULL) {
      /*
       * Decrement the reference count of the ResolvedCmdName structure.
       * If there are no more uses, free the ResolvedCmdName structure.
       */
    
        resPtr->refCount--;
        if (resPtr->refCount == 0) {
            /*
           * Now free the cached command, unless it is still in its
             * hash table or if there are other references to it
             * from other cmdName objects.
           */
          
            Command *cmdPtr = resPtr->cmdPtr;
            TclCleanupCommand(cmdPtr);
            ckfree((char *) resPtr);
        }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DupCmdNameInternalRep --
 *
 *    Initialize the internal representation of an cmdName Tcl_Obj to a
 *    copy of the internal representation of an existing cmdName object. 
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    "copyPtr"s internal rep is set to point to the ResolvedCmdName
 *    structure corresponding to "srcPtr"s internal rep. Increments the
 *    ref count of the ResolvedCmdName structure pointed to by the
 *    cmdName's internal representation.
 *
 *----------------------------------------------------------------------
 */

static void
DupCmdNameInternalRep(srcPtr, copyPtr)
    Tcl_Obj *srcPtr;          /* Object with internal rep to copy. */
    register Tcl_Obj *copyPtr;      /* Object with internal rep to set. */
{
    register ResolvedCmdName *resPtr =
        (ResolvedCmdName *) srcPtr->internalRep.twoPtrValue.ptr1;

    copyPtr->internalRep.twoPtrValue.ptr1 = (VOID *) resPtr;
    copyPtr->internalRep.twoPtrValue.ptr2 = NULL;
    if (resPtr != NULL) {
        resPtr->refCount++;
    }
    copyPtr->typePtr = &tclCmdNameType;
}

/*
 *----------------------------------------------------------------------
 *
 * SetCmdNameFromAny --
 *
 *    Generate an cmdName internal form for the Tcl object "objPtr".
 *
 * Results:
 *    The return value is a standard Tcl result. The conversion always
 *    succeeds and TCL_OK is returned.
 *
 * Side effects:
 *    A pointer to a ResolvedCmdName structure that holds a cached pointer
 *    to the command with a name that matches objPtr's string rep is
 *    stored as objPtr's internal representation. This ResolvedCmdName
 *    pointer will be NULL if no matching command was found. The ref count
 *    of the cached Command's structure (if any) is also incremented.
 *
 *----------------------------------------------------------------------
 */

static int
SetCmdNameFromAny(interp, objPtr)
    Tcl_Interp *interp;       /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr; /* The object to convert. */
{
    Interp *iPtr = (Interp *) interp;
    char *name;
    Tcl_Command cmd;
    register Command *cmdPtr;
    Namespace *currNsPtr;
    register ResolvedCmdName *resPtr;

    /*
     * Get "objPtr"s string representation. Make it up-to-date if necessary.
     */

    name = objPtr->bytes;
    if (name == NULL) {
      name = Tcl_GetString(objPtr);
    }

    /*
     * Find the Command structure, if any, that describes the command called
     * "name". Build a ResolvedCmdName that holds a cached pointer to this
     * Command, and bump the reference count in the referenced Command
     * structure. A Command structure will not be deleted as long as it is
     * referenced from a CmdName object.
     */

    cmd = Tcl_FindCommand(interp, name, (Tcl_Namespace *) NULL,
          /*flags*/ 0);
    cmdPtr = (Command *) cmd;
    if (cmdPtr != NULL) {
      /*
       * Get the current namespace.
       */
      
      if (iPtr->varFramePtr != NULL) {
          currNsPtr = iPtr->varFramePtr->nsPtr;
      } else {
          currNsPtr = iPtr->globalNsPtr;
      }
      
      cmdPtr->refCount++;
        resPtr = (ResolvedCmdName *) ckalloc(sizeof(ResolvedCmdName));
        resPtr->cmdPtr        = cmdPtr;
        resPtr->refNsPtr      = currNsPtr;
        resPtr->refNsId       = currNsPtr->nsId;
        resPtr->refNsCmdEpoch = currNsPtr->cmdRefEpoch;
        resPtr->cmdEpoch      = cmdPtr->cmdEpoch;
        resPtr->refCount      = 1;
    } else {
      resPtr = NULL;    /* no command named "name" was found */
    }

    /*
     * Free the old internalRep before setting the new one. We do this as
     * late as possible to allow the conversion code, in particular
     * GetStringFromObj, to use that old internalRep. If no Command
     * structure was found, leave NULL as the cached value.
     */

    if ((objPtr->typePtr != NULL)
          && (objPtr->typePtr->freeIntRepProc != NULL)) {
      objPtr->typePtr->freeIntRepProc(objPtr);
    }
    
    objPtr->internalRep.twoPtrValue.ptr1 = (VOID *) resPtr;
    objPtr->internalRep.twoPtrValue.ptr2 = NULL;
    objPtr->typePtr = &tclCmdNameType;
    return TCL_OK;
}

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