tclint.h

tcl是工具命令语言

    struct Command *selfPtr;	/* Pointer to this imported command. Needed
				 * only when deleting it in order to remove
				 * it from the real command's linked list of
				 * imported commands that refer to it. */
} ImportedCmdData;

/*
 * A Command structure exists for each command in a namespace. The
 * Tcl_Command opaque type actually refers to these structures.
 */

typedef struct Command {
    Tcl_HashEntry *hPtr;	/* Pointer to the hash table entry that
				 * refers to this command. The hash table is
				 * either a namespace's command table or an
				 * interpreter's hidden command table. This
				 * pointer is used to get a command's name
				 * from its Tcl_Command handle. NULL means
				 * that the hash table entry has been
				 * removed already (this can happen if
				 * deleteProc causes the command to be
				 * deleted or recreated). */
    Namespace *nsPtr;		/* Points to the namespace containing this
				 * command. */
    int refCount;		/* 1 if in command hashtable plus 1 for each
				 * reference from a CmdName Tcl object
				 * representing a command's name in a
				 * ByteCode instruction sequence. This
				 * structure can be freed when refCount
				 * becomes zero. */
    int cmdEpoch;		/* Incremented to invalidate any references
				 * that point to this command when it is
				 * renamed, deleted, hidden, or exposed. */
    CompileProc *compileProc;	/* Procedure called to compile command. NULL
				 * if no compile proc exists for command. */
    Tcl_ObjCmdProc *objProc;	/* Object-based command procedure. */
    ClientData objClientData;	/* Arbitrary value passed to object proc. */
    Tcl_CmdProc *proc;		/* String-based command procedure. */
    ClientData clientData;	/* Arbitrary value passed to string proc. */
    Tcl_CmdDeleteProc *deleteProc;
				/* Procedure invoked when deleting command
				 * to, e.g., free all client data. */
    ClientData deleteData;	/* Arbitrary value passed to deleteProc. */
    int flags;			/* Miscellaneous bits of information about
				 * command. See below for definitions. */
    ImportRef *importRefPtr;	/* List of each imported Command created in
				 * another namespace when this command is
				 * imported. These imported commands
				 * redirect invocations back to this
				 * command. The list is used to remove all
				 * those imported commands when deleting
				 * this "real" command. */
    CommandTrace *tracePtr;	/* First in list of all traces set for this
				 * command. */
} Command;

/*
 * Flag bits for commands. 
 *
 * CMD_IS_DELETED -		Means that the command is in the process
 *                              of being deleted (its deleteProc is
 *                              currently executing). Other attempts to
 *                              delete the command should be ignored.
 * CMD_TRACE_ACTIVE -		1 means that trace processing is currently
 *				underway for a rename/delete change.
 *				See the two flags below for which is
 *				currently being processed.
 * CMD_HAS_EXEC_TRACES -	1 means that this command has at least
 *                              one execution trace (as opposed to simple
 *                              delete/rename traces) in its tracePtr list.
 * TCL_TRACE_RENAME -           A rename trace is in progress. Further
 *                              recursive renames will not be traced.
 * TCL_TRACE_DELETE -           A delete trace is in progress. Further 
 *                              recursive deletes will not be traced.
 * (these last two flags are defined in tcl.h)
 */
#define CMD_IS_DELETED		0x1
#define CMD_TRACE_ACTIVE	0x2
#define CMD_HAS_EXEC_TRACES	0x4

/*
 *----------------------------------------------------------------
 * Data structures related to name resolution procedures.
 *----------------------------------------------------------------
 */

/*
 * The interpreter keeps a linked list of name resolution schemes.
 * The scheme for a namespace is consulted first, followed by the
 * list of schemes in an interpreter, followed by the default
 * name resolution in Tcl.  Schemes are added/removed from the
 * interpreter's list by calling Tcl_AddInterpResolver and
 * Tcl_RemoveInterpResolver.
 */

typedef struct ResolverScheme {
    char *name;			/* Name identifying this scheme. */
    Tcl_ResolveCmdProc *cmdResProc;
				/* Procedure handling command name
				 * resolution. */
    Tcl_ResolveVarProc *varResProc;
				/* Procedure handling variable name
				 * resolution for variables that
				 * can only be handled at runtime. */
    Tcl_ResolveCompiledVarProc *compiledVarResProc;
				/* Procedure handling variable name
				 * resolution at compile time. */

    struct ResolverScheme *nextPtr;
				/* Pointer to next record in linked list. */
} ResolverScheme;

/*
 *----------------------------------------------------------------
 * This structure defines an interpreter, which is a collection of
 * commands plus other state information related to interpreting
 * commands, such as variable storage. Primary responsibility for
 * this data structure is in tclBasic.c, but almost every Tcl
 * source file uses something in here.
 *----------------------------------------------------------------
 */

typedef struct Interp {

    /*
     * Note:  the first three fields must match exactly the fields in
     * a Tcl_Interp struct (see tcl.h).	 If you change one, be sure to
     * change the other.
     *
     * The interpreter's result is held in both the string and the
     * objResultPtr fields. These fields hold, respectively, the result's
     * string or object value. The interpreter's result is always in the
     * result field if that is non-empty, otherwise it is in objResultPtr.
     * The two fields are kept consistent unless some C code sets
     * interp->result directly. Programs should not access result and
     * objResultPtr directly; instead, they should always get and set the
     * result using procedures such as Tcl_SetObjResult, Tcl_GetObjResult,
     * and Tcl_GetStringResult. See the SetResult man page for details.
     */

    char *result;		/* If the last command returned a string
				 * result, this points to it. Should not be
				 * accessed directly; see comment above. */
    Tcl_FreeProc *freeProc;	/* Zero means a string result is statically
				 * allocated. TCL_DYNAMIC means string
				 * result was allocated with ckalloc and
				 * should be freed with ckfree. Other values
				 * give address of procedure to invoke to
				 * free the string result. Tcl_Eval must
				 * free it before executing next command. */
    int errorLine;		/* When TCL_ERROR is returned, this gives
				 * the line number in the command where the
				 * error occurred (1 means first line). */
    struct TclStubs *stubTable;
				/* Pointer to the exported Tcl stub table.
				 * On previous versions of Tcl this is a
				 * pointer to the objResultPtr or a pointer
				 * to a buckets array in a hash table. We
				 * therefore have to do some careful checking
				 * before we can use this. */

    TclHandle handle;		/* Handle used to keep track of when this
				 * interp is deleted. */

    Namespace *globalNsPtr;	/* The interpreter's global namespace. */
    Tcl_HashTable *hiddenCmdTablePtr;
				/* Hash table used by tclBasic.c to keep
				 * track of hidden commands on a per-interp
				 * basis. */
    ClientData interpInfo;	/* Information used by tclInterp.c to keep
				 * track of master/slave interps on
				 * a per-interp basis. */
    Tcl_HashTable mathFuncTable;/* Contains all the math functions currently
				 * defined for the interpreter.	 Indexed by
				 * strings (function names); values have
				 * type (MathFunc *). */



    /*
     * Information related to procedures and variables. See tclProc.c
     * and tclVar.c for usage.
     */

    int numLevels;		/* Keeps track of how many nested calls to
				 * Tcl_Eval are in progress for this
				 * interpreter.	 It's used to delay deletion
				 * of the table until all Tcl_Eval
				 * invocations are completed. */
    int maxNestingDepth;	/* If numLevels exceeds this value then Tcl
				 * assumes that infinite recursion has
				 * occurred and it generates an error. */
    CallFrame *framePtr;	/* Points to top-most in stack of all nested
				 * procedure invocations.  NULL means there
				 * are no active procedures. */
    CallFrame *varFramePtr;	/* Points to the call frame whose variables
				 * are currently in use (same as framePtr
				 * unless an "uplevel" command is
				 * executing). NULL means no procedure is
				 * active or "uplevel 0" is executing. */
    ActiveVarTrace *activeVarTracePtr;
				/* First in list of active traces for
				 * interp, or NULL if no active traces. */
    int returnCode;		/* Completion code to return if current
				 * procedure exits with TCL_RETURN code. */
    char *errorInfo;		/* Value to store in errorInfo if returnCode
				 * is TCL_ERROR.  Malloc'ed, may be NULL */
    char *errorCode;		/* Value to store in errorCode if returnCode
				 * is TCL_ERROR.  Malloc'ed, may be NULL */

    /*
     * Information used by Tcl_AppendResult to keep track of partial
     * results.	 See Tcl_AppendResult code for details.
     */

    char *appendResult;		/* Storage space for results generated
				 * by Tcl_AppendResult.	 Malloc-ed.  NULL
				 * means not yet allocated. */
    int appendAvl;		/* Total amount of space available at
				 * partialResult. */
    int appendUsed;		/* Number of non-null bytes currently
				 * stored at partialResult. */

    /*
     * Information about packages.  Used only in tclPkg.c.
     */

    Tcl_HashTable packageTable;	/* Describes all of the packages loaded
				 * in or available to this interpreter.
				 * Keys are package names, values are
				 * (Package *) pointers. */
    char *packageUnknown;	/* Command to invoke during "package
				 * require" commands for packages that
				 * aren't described in packageTable. 
				 * Malloc'ed, may be NULL. */

    /*
     * Miscellaneous information:
     */

    int cmdCount;		/* Total number of times a command procedure
				 * has been called for this interpreter. */
    int evalFlags;		/* Flags to control next call to Tcl_Eval.
				 * Normally zero, but may be set before
				 * calling Tcl_Eval.  See below for valid
				 * values. */
    int termOffset;		/* Offset of character just after last one
				 * compiled or executed by Tcl_EvalObj. */
    LiteralTable literalTable;	/* Contains LiteralEntry's describing all
				 * Tcl objects holding literals of scripts
				 * compiled by the interpreter. Indexed by
				 * the string representations of literals.
				 * Used to avoid creating duplicate
				 * objects. */
    int compileEpoch;		/* Holds the current "compilation epoch"
				 * for this interpreter. This is
				 * incremented to invalidate existing
				 * ByteCodes when, e.g., a command with a
				 * compile procedure is redefined. */
    Proc *compiledProcPtr;	/* If a procedure is being compiled, a
				 * pointer to its Proc structure; otherwise,
				 * this is NULL. Set by ObjInterpProc in
				 * tclProc.c and used by tclCompile.c to
				 * process local variables appropriately. */
    ResolverScheme *resolverPtr;
				/* Linked list of name resolution schemes
				 * added to this interpreter.  Schemes
				 * are added/removed by calling
				 * Tcl_AddInterpResolvers and
				 * Tcl_RemoveInterpResolver. */
    Tcl_Obj *scriptFile;	/* NULL means there is no nested source
				 * command active;  otherwise this points to
				 * pathPtr of the file being sourced. */
    int flags;			/* Various flag bits.  See below. */
    long randSeed;		/* Seed used for rand() function. */
    Trace *tracePtr;		/* List of traces for this interpreter. */
    Tcl_HashTable *assocData;	/* Hash table for associating data with
				 * this interpreter. Cleaned up when
				 * this interpreter is deleted. */
    struct ExecEnv *execEnvPtr;	/* Execution environment for Tcl bytecode
				 * execution. Contains a pointer to the
				 * Tcl evaluation stack. */
    Tcl_Obj *emptyObjPtr;	/* Points to an object holding an empty
				 * string. Returned by Tcl_ObjSetVar2 when
				 * variable traces change a variable in a
				 * gross way. */
    char resultSpace[TCL_RESULT_SIZE+1];
				/* Static space holding small results. */
    Tcl_Obj *objResultPtr;	/* If the last command returned an object
				 * result, this points to it. Should not be
				 * accessed directly; see comment above. */
    Tcl_ThreadId threadId;	/* ID of thread that owns the interpreter */

    ActiveCommandTrace *activeCmdTracePtr;
				/* First in list of active command traces for
				 * interp, or NULL if no active traces. */
    ActiveInterpTrace *activeInterpTracePtr;
				/* First in list of active traces for
				 * interp, or NULL if no active traces. */

    int tracesForbiddingInline; /* Count of traces (in the list headed by
				 * tracePtr) that forbid inline bytecode
				 * compilation */
    /*
     * Statistical information about the bytecode compiler and interpreter's
     * operation.
     */

#ifdef TCL_COMPILE_STATS
    ByteCodeStats stats;	/* Holds compilation and execution
				 * statistics for this interpreter. */
#endif /* TCL_COMPILE_STATS */	  
} Interp;

/*
 * EvalFlag bits for Interp structures:
 *
 * TCL_BRACKET_TERM	1 means that the current script is terminated by
 *			a close bracket rather than the end of the string.
 * TCL_ALLOW_EXCEPTIONS	1 means it's OK for the script to terminate with
 *			a code other than TCL_OK or TCL_ERROR;	0 means
 *			codes other than these should be turned into errors.
 */

#define TCL_BRACKET_TERM	  1
#define TCL_ALLOW_EXCEPTIONS	  4

/*
 * Flag bits for Interp structures:
 *
 * DELETED:		Non-zero means the interpreter has been deleted:
 *			don't process any more commands for it, and destroy
 *			the structure as soon as all nested invocations of
 *			Tcl_Eval are done.
 * ERR_IN_PROGRESS:	Non-zero means an error unwind is already in