tcl.h

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				 * does not need freeing. */
    Tcl_DupInternalRepProc *dupIntRepProc;
    				/* Called to create a new object as a copy
				 * of an existing object. */
    Tcl_UpdateStringProc *updateStringProc;
    				/* Called to update the string rep from the
				 * type's internal representation. */
    Tcl_SetFromAnyProc *setFromAnyProc;
    				/* Called to convert the object's internal
				 * rep to this type. Frees the internal rep
				 * of the old type. Returns TCL_ERROR on
				 * failure. */
} Tcl_ObjType;


/*
 * One of the following structures exists for each object in the Tcl
 * system. An object stores a value as either a string, some internal
 * representation, or both.
 */

typedef struct Tcl_Obj {
    int refCount;		/* When 0 the object will be freed. */
    char *bytes;		/* This points to the first byte of the
				 * object's string representation. The array
				 * must be followed by a null byte (i.e., at
				 * offset length) but may also contain
				 * embedded null characters. The array's
				 * storage is allocated by ckalloc. NULL
				 * means the string rep is invalid and must
				 * be regenerated from the internal rep.
				 * Clients should use Tcl_GetStringFromObj
				 * or Tcl_GetString to get a pointer to the
				 * byte array as a readonly value. */
    int length;			/* The number of bytes at *bytes, not
				 * including the terminating null. */
    Tcl_ObjType *typePtr;	/* Denotes the object's type. Always
				 * corresponds to the type of the object's
				 * internal rep. NULL indicates the object
				 * has no internal rep (has no type). */
    union {			/* The internal representation: */
	long longValue;		/*   - an long integer value */
	double doubleValue;	/*   - a double-precision floating value */
	VOID *otherValuePtr;	/*   - another, type-specific value */
	Tcl_WideInt wideValue;	/*   - a long long value */
	struct {		/*   - internal rep as two pointers */
	    VOID *ptr1;
	    VOID *ptr2;
	} twoPtrValue;
    } internalRep;
} Tcl_Obj;


/*
 * Macros to increment and decrement a Tcl_Obj's reference count, and to
 * test whether an object is shared (i.e. has reference count > 1).
 * Note: clients should use Tcl_DecrRefCount() when they are finished using
 * an object, and should never call TclFreeObj() directly. TclFreeObj() is
 * only defined and made public in tcl.h to support Tcl_DecrRefCount's macro
 * definition. Note also that Tcl_DecrRefCount() refers to the parameter
 * "obj" twice. This means that you should avoid calling it with an
 * expression that is expensive to compute or has side effects.
 */
void		Tcl_IncrRefCount _ANSI_ARGS_((Tcl_Obj *objPtr));
void		Tcl_DecrRefCount _ANSI_ARGS_((Tcl_Obj *objPtr));
int		Tcl_IsShared _ANSI_ARGS_((Tcl_Obj *objPtr));

#ifdef TCL_MEM_DEBUG
#   define Tcl_IncrRefCount(objPtr) \
	Tcl_DbIncrRefCount(objPtr, __FILE__, __LINE__)
#   define Tcl_DecrRefCount(objPtr) \
	Tcl_DbDecrRefCount(objPtr, __FILE__, __LINE__)
#   define Tcl_IsShared(objPtr) \
	Tcl_DbIsShared(objPtr, __FILE__, __LINE__)
#else
#   define Tcl_IncrRefCount(objPtr) \
	++(objPtr)->refCount
#   define Tcl_DecrRefCount(objPtr) \
	if (--(objPtr)->refCount <= 0) TclFreeObj(objPtr)
#   define Tcl_IsShared(objPtr) \
	((objPtr)->refCount > 1)
#endif

/*
 * Macros and definitions that help to debug the use of Tcl objects.
 * When TCL_MEM_DEBUG is defined, the Tcl_New declarations are 
 * overridden to call debugging versions of the object creation procedures.
 */

#ifdef TCL_MEM_DEBUG
#  define Tcl_NewBooleanObj(val) \
     Tcl_DbNewBooleanObj(val, __FILE__, __LINE__)
#  define Tcl_NewByteArrayObj(bytes, len) \
     Tcl_DbNewByteArrayObj(bytes, len, __FILE__, __LINE__)
#  define Tcl_NewDoubleObj(val) \
     Tcl_DbNewDoubleObj(val, __FILE__, __LINE__)
#  define Tcl_NewIntObj(val) \
     Tcl_DbNewLongObj(val, __FILE__, __LINE__)
#  define Tcl_NewListObj(objc, objv) \
     Tcl_DbNewListObj(objc, objv, __FILE__, __LINE__)
#  define Tcl_NewLongObj(val) \
     Tcl_DbNewLongObj(val, __FILE__, __LINE__)
#  define Tcl_NewObj() \
     Tcl_DbNewObj(__FILE__, __LINE__)
#  define Tcl_NewStringObj(bytes, len) \
     Tcl_DbNewStringObj(bytes, len, __FILE__, __LINE__)
#  define Tcl_NewWideIntObj(val) \
     Tcl_DbNewWideIntObj(val, __FILE__, __LINE__)
#endif /* TCL_MEM_DEBUG */


/*
 * The following structure contains the state needed by
 * Tcl_SaveResult.  No-one outside of Tcl should access any of these
 * fields.  This structure is typically allocated on the stack.
 */
typedef struct Tcl_SavedResult {
    char *result;
    Tcl_FreeProc *freeProc;
    Tcl_Obj *objResultPtr;
    char *appendResult;
    int appendAvl;
    int appendUsed;
    char resultSpace[TCL_RESULT_SIZE+1];
} Tcl_SavedResult;


/*
 * The following definitions support Tcl's namespace facility.
 * Note: the first five fields must match exactly the fields in a
 * Namespace structure (see tclInt.h). 
 */

typedef struct Tcl_Namespace {
    char *name;                 /* The namespace's name within its parent
				 * namespace. This contains no ::'s. The
				 * name of the global namespace is ""
				 * although "::" is an synonym. */
    char *fullName;             /* The namespace's fully qualified name.
				 * This starts with ::. */
    ClientData clientData;      /* Arbitrary value associated with this
				 * namespace. */
    Tcl_NamespaceDeleteProc* deleteProc;
                                /* Procedure invoked when deleting the
				 * namespace to, e.g., free clientData. */
    struct Tcl_Namespace* parentPtr;
                                /* Points to the namespace that contains
				 * this one. NULL if this is the global
				 * namespace. */
} Tcl_Namespace;


/*
 * The following structure represents a call frame, or activation record.
 * A call frame defines a naming context for a procedure call: its local
 * scope (for local variables) and its namespace scope (used for non-local
 * variables; often the global :: namespace). A call frame can also define
 * the naming context for a namespace eval or namespace inscope command:
 * the namespace in which the command's code should execute. The
 * Tcl_CallFrame structures exist only while procedures or namespace
 * eval/inscope's are being executed, and provide a Tcl call stack.
 * 
 * A call frame is initialized and pushed using Tcl_PushCallFrame and
 * popped using Tcl_PopCallFrame. Storage for a Tcl_CallFrame must be
 * provided by the Tcl_PushCallFrame caller, and callers typically allocate
 * them on the C call stack for efficiency. For this reason, Tcl_CallFrame
 * is defined as a structure and not as an opaque token. However, most
 * Tcl_CallFrame fields are hidden since applications should not access
 * them directly; others are declared as "dummyX".
 *
 * WARNING!! The structure definition must be kept consistent with the
 * CallFrame structure in tclInt.h. If you change one, change the other.
 */

typedef struct Tcl_CallFrame {
    Tcl_Namespace *nsPtr;
    int dummy1;
    int dummy2;
    char *dummy3;
    char *dummy4;
    char *dummy5;
    int dummy6;
    char *dummy7;
    char *dummy8;
    int dummy9;
    char* dummy10;
} Tcl_CallFrame;


/*
 * Information about commands that is returned by Tcl_GetCommandInfo and
 * passed to Tcl_SetCommandInfo. objProc is an objc/objv object-based
 * command procedure while proc is a traditional Tcl argc/argv
 * string-based procedure. Tcl_CreateObjCommand and Tcl_CreateCommand
 * ensure that both objProc and proc are non-NULL and can be called to
 * execute the command. However, it may be faster to call one instead of
 * the other. The member isNativeObjectProc is set to 1 if an
 * object-based procedure was registered by Tcl_CreateObjCommand, and to
 * 0 if a string-based procedure was registered by Tcl_CreateCommand.
 * The other procedure is typically set to a compatibility wrapper that
 * does string-to-object or object-to-string argument conversions then
 * calls the other procedure.
 */

typedef struct Tcl_CmdInfo {
    int isNativeObjectProc;	 /* 1 if objProc was registered by a call to
				  * Tcl_CreateObjCommand; 0 otherwise.
				  * Tcl_SetCmdInfo does not modify this
				  * field. */
    Tcl_ObjCmdProc *objProc;	 /* Command's object-based procedure. */
    ClientData objClientData;	 /* ClientData for object proc. */
    Tcl_CmdProc *proc;		 /* Command's string-based procedure. */
    ClientData clientData;	 /* ClientData for string proc. */
    Tcl_CmdDeleteProc *deleteProc;
                                 /* Procedure to call when command is
                                  * deleted. */
    ClientData deleteData;	 /* Value to pass to deleteProc (usually
				  * the same as clientData). */
    Tcl_Namespace *namespacePtr; /* Points to the namespace that contains
				  * this command. Note that Tcl_SetCmdInfo
				  * will not change a command's namespace;
				  * use Tcl_RenameCommand to do that. */

} Tcl_CmdInfo;

/*
 * The structure defined below is used to hold dynamic strings.  The only
 * field that clients should use is the string field, accessible via the
 * macro Tcl_DStringValue.  
 */
#define TCL_DSTRING_STATIC_SIZE 200
typedef struct Tcl_DString {
    char *string;		/* Points to beginning of string:  either
				 * staticSpace below or a malloced array. */
    int length;			/* Number of non-NULL characters in the
				 * string. */
    int spaceAvl;		/* Total number of bytes available for the
				 * string and its terminating NULL char. */
    char staticSpace[TCL_DSTRING_STATIC_SIZE];
				/* Space to use in common case where string
				 * is small. */
} Tcl_DString;

#define Tcl_DStringLength(dsPtr) ((dsPtr)->length)
#define Tcl_DStringValue(dsPtr) ((dsPtr)->string)
#define Tcl_DStringTrunc Tcl_DStringSetLength

/*
 * Definitions for the maximum number of digits of precision that may
 * be specified in the "tcl_precision" variable, and the number of
 * bytes of buffer space required by Tcl_PrintDouble.
 */
#define TCL_MAX_PREC 17
#define TCL_DOUBLE_SPACE (TCL_MAX_PREC+10)

/*
 * Definition for a number of bytes of buffer space sufficient to hold the
 * string representation of an integer in base 10 (assuming the existence
 * of 64-bit integers).
 */
#define TCL_INTEGER_SPACE	24

/*
 * Flag that may be passed to Tcl_ConvertElement to force it not to
 * output braces (careful!  if you change this flag be sure to change
 * the definitions at the front of tclUtil.c).
 */
#define TCL_DONT_USE_BRACES	1

/*
 * Flag that may be passed to Tcl_GetIndexFromObj to force it to disallow
 * abbreviated strings.
 */
#define TCL_EXACT	1

/*
 * Flag values passed to Tcl_RecordAndEval and/or Tcl_EvalObj.
 * WARNING: these bit choices must not conflict with the bit choices
 * for evalFlag bits in tclInt.h!!
 */
#define TCL_NO_EVAL		0x10000
#define TCL_EVAL_GLOBAL		0x20000
#define TCL_EVAL_DIRECT		0x40000
#define TCL_EVAL_INVOKE	        0x80000

/*
 * Special freeProc values that may be passed to Tcl_SetResult (see
 * the man page for details):
 */
#define TCL_VOLATILE	((Tcl_FreeProc *) 1)
#define TCL_STATIC	((Tcl_FreeProc *) 0)
#define TCL_DYNAMIC	((Tcl_FreeProc *) 3)

/*
 * Flag values passed to variable-related procedures.
 */
#define TCL_GLOBAL_ONLY		 1
#define TCL_NAMESPACE_ONLY	 2
#define TCL_APPEND_VALUE	 4
#define TCL_LIST_ELEMENT	 8
#define TCL_TRACE_READS		 0x10
#define TCL_TRACE_WRITES	 0x20
#define TCL_TRACE_UNSETS	 0x40
#define TCL_TRACE_DESTROYED	 0x80
#define TCL_INTERP_DESTROYED	 0x100
#define TCL_LEAVE_ERR_MSG	 0x200
#define TCL_TRACE_ARRAY		 0x800
#ifndef TCL_REMOVE_OBSOLETE_TRACES
/* Required to support old variable/vdelete/vinfo traces */
#define TCL_TRACE_OLD_STYLE	 0x1000
#endif
/* Indicate the semantics of the result of a trace */
#define TCL_TRACE_RESULT_DYNAMIC 0x8000
#define TCL_TRACE_RESULT_OBJECT  0x10000

/*
 * Flag values passed to command-related procedures.
 */

#define TCL_TRACE_RENAME 0x2000
#define TCL_TRACE_DELETE 0x4000

#define TCL_ALLOW_INLINE_COMPILATION 0x20000

/*
 * Flag values passed to Tcl_CreateObjTrace, and used internally
 * by command execution traces.  Slots 4,8,16 and 32 are
 * used internally by execution traces (see tclCmdMZ.c)
 */
#define TCL_TRACE_ENTER_EXEC		1
#define TCL_TRACE_LEAVE_EXEC		2

/*
 * The TCL_PARSE_PART1 flag is deprecated and has no effect. 
 * The part1 is now always parsed whenever the part2 is NULL.
 * (This is to avoid a common error when converting code to
 *  use the new object based APIs and forgetting to give the
 *  flag)
 */
#ifndef TCL_NO_DEPRECATED
#   define TCL_PARSE_PART1      0x400
#endif


/*
 * Types for linked variables:
 */
#define TCL_LINK_INT		1
#define TCL_LINK_DOUBLE		2
#define TCL_LINK_BOOLEAN	3
#define TCL_LINK_STRING		4
#define TCL_LINK_WIDE_INT	5
#define TCL_LINK_READ_ONLY	0x80


/*
 * Forward declarations of Tcl_HashTable and related types.
 */
typedef struct Tcl_HashKeyType Tcl_HashKeyType;
typedef struct Tcl_HashTable Tcl_HashTable;
typedef struct Tcl_HashEntry Tcl_HashEntry;

typedef unsigned int (Tcl_HashKeyProc) _ANSI_ARGS_((Tcl_HashTable *tablePtr,
	VOID *keyPtr));