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1.1     ! root        1: /*
        !             2:  * tclInt.h --
        !             3:  *
        !             4:  *     Declarations of things used internally by the Tcl interpreter.
        !             5:  *
        !             6:  * Copyright 1987 Regents of the University of California
        !             7:  * Permission to use, copy, modify, and distribute this
        !             8:  * software and its documentation for any purpose and without
        !             9:  * fee is hereby granted, provided that the above copyright
        !            10:  * notice appear in all copies.  The University of California
        !            11:  * makes no representations about the suitability of this
        !            12:  * software for any purpose.  It is provided "as is" without
        !            13:  * express or implied warranty.
        !            14:  *
        !            15:  * $Header: /sprite/src/lib/tcl/RCS/tclInt.h,v 1.22 90/03/29 10:55:01 ouster Exp $ SPRITE (Berkeley)
        !            16:  */
        !            17: 
        !            18: #ifndef _TCLINT
        !            19: #define _TCLINT
        !            20: 
        !            21: #ifndef _TCL
        !            22: #include "tcl.h"
        !            23: #endif
        !            24: 
        !            25: #define        bcopy(src,dest,count)   memcpy(dest,src,count)
        !            26: 
        !            27: /*
        !            28:  * The structure below defines one Tcl command, by associating a procedure
        !            29:  * with a textual string.
        !            30:  */
        !            31: 
        !            32: typedef struct Command {
        !            33:     int (*proc)();             /* Procedure to process command. */
        !            34:     ClientData clientData;     /* Arbitrary value to pass to proc. */
        !            35:     void (*deleteProc)();      /* Procedure to invoke when deleting
        !            36:                                 * command. */
        !            37:     struct Command *nextPtr;   /* Pointer to next command in list, or NULL
        !            38:                                 * for end of list. */
        !            39:     char name[4];              /* Name of command.  The actual size of this
        !            40:                                 * portion is as large as is necessary to
        !            41:                                 * hold the characters.  This must be the
        !            42:                                 * last subfield of the record. */
        !            43: } Command;
        !            44: 
        !            45: #define CMD_SIZE(nameLength) ((unsigned) sizeof(Command) + nameLength - 3)
        !            46: 
        !            47: /*
        !            48:  * The structure below defines a variable, which associates a string name
        !            49:  * with a string value.  To cut down on the number of malloc's and free's
        !            50:  * (particularly for procedure parameters), space for both the variable's
        !            51:  * name and initial value is allocated at the end of the structure (in
        !            52:  * "storage").  If the variable's value changes later, a new dynamic
        !            53:  * string is allocated, if there is insufficient space in the current
        !            54:  * storage area.
        !            55:  */
        !            56: 
        !            57: typedef struct Var {
        !            58:     char *value;               /* Current value of variable (either points
        !            59:                                 * to static space after name, or to dynamic
        !            60:                                 * space if VAR_DYNAMIC is set). */
        !            61:     int valueLength;           /* Number of bytes of storage at the place
        !            62:                                 * referred to by value, not including space
        !            63:                                 * for NULL terminator. */
        !            64:     int flags;                 /* Miscellaneous flags:  see below. */
        !            65:     struct Var *globalPtr;     /* If VAR_GLOBAL is set, this points to the
        !            66:                                 * global variable corresponding to name. */
        !            67:     struct Var *nextPtr;       /* Next variable in list, or NULL for end
        !            68:                                 * of list. */
        !            69:     char name[4];              /* Storage space for variable's name (and
        !            70:                                 * initial value).  The name is at the
        !            71:                                 * beginning, and is null-terminated.
        !            72:                                 * May contain more than 4 bytes (see
        !            73:                                 * VAR_SIZE macro below). */
        !            74: } Var;
        !            75: 
        !            76: #define VAR_SIZE(nameLength, valueLength) \
        !            77:        ((unsigned) sizeof(Var) + nameLength + valueLength - 2)
        !            78: 
        !            79: /*
        !            80:  * Variable flags:
        !            81:  *
        !            82:  * VAR_DYNAMIC:                1 means the storage space for the value was
        !            83:  *                     dynamically allocated, and must eventually be
        !            84:  *                     freed.
        !            85:  * VAR_GLOBAL:         Used only in local variables.  Means that this
        !            86:  *                     is really a global variable.
        !            87:  * VAR_DOESNT_EXIST:   1 means this variable has not yet been assigned
        !            88:  *                     a value.  Used when a "global" command refers
        !            89:  *                     to a variable that hasn't been set yet.
        !            90:  */
        !            91: 
        !            92: #define VAR_DYNAMIC            1
        !            93: #define VAR_GLOBAL             2
        !            94: #define VAR_DOESNT_EXIST       4
        !            95: 
        !            96: /*
        !            97:  * The structure below defines a command procedure, which consists of
        !            98:  * a collection of Tcl commands plus information about arguments and
        !            99:  * variables.
        !           100:  */
        !           101: 
        !           102: typedef struct Proc {
        !           103:     struct Interp *iPtr;       /* Interpreter for which this command
        !           104:                                 * is defined. */
        !           105:     char *command;             /* Command that constitutes the body of
        !           106:                                 * the procedure (dynamically allocated). */
        !           107:     Var *argPtr;               /* Pointer to first in list of variables
        !           108:                                 * giving names to the procedure's arguments.
        !           109:                                 * The order of the variables is the same
        !           110:                                 * as the order of the arguments.  The "value"
        !           111:                                 * fields of the variables are the default
        !           112:                                 * values. */
        !           113: } Proc;
        !           114: 
        !           115: /*
        !           116:  * The structure below defines a trace.  This is used to allow Tcl
        !           117:  * clients to find out whenever a command is about to be executed.
        !           118:  */
        !           119: 
        !           120: typedef struct Trace {
        !           121:     int level;                 /* Only trace commands at nesting level
        !           122:                                 * less than or equal to this. */
        !           123:     void (*proc)();            /* Procedure to call to trace command. */
        !           124:     ClientData clientData;     /* Arbitrary value to pass to proc. */
        !           125:     struct Trace *nextPtr;     /* Next in list of traces for this interp. */
        !           126: } Trace;
        !           127: 
        !           128: /*
        !           129:  * The stucture below defines an interpreter callback, which is
        !           130:  * a procedure to invoke just before an interpreter is deleted.
        !           131:  */
        !           132: 
        !           133: typedef struct InterpCallback {
        !           134:     void (*proc)();            /* Procedure to call. */
        !           135:     ClientData clientData;     /* Value to pass to procedure. */
        !           136:     struct InterpCallback *nextPtr;
        !           137:                                /* Next in list of callbacks for this
        !           138:                                 * interpreter (or NULL for end of
        !           139:                                 * list). */
        !           140: } InterpCallback;
        !           141: 
        !           142: /*
        !           143:  * The structure below defines a frame, which is a procedure invocation.
        !           144:  * These structures exist only while procedures are being executed, and
        !           145:  * provide a sort of call stack.
        !           146:  */
        !           147: 
        !           148: typedef struct CallFrame {
        !           149:     Var *varPtr;               /* First in list of all local variables
        !           150:                                 * and arguments for this procedure
        !           151:                                 * invocation. */
        !           152:     int level;                 /* Level of this procedure, for "uplevel"
        !           153:                                 * purposes (i.e. corresponds to nesting of
        !           154:                                 * callerVarPtr's, not callerPtr's).  1 means
        !           155:                                 * outer-most procedure, 0 means top-level. */
        !           156:     int argc;                  /* This and argv below describe name and
        !           157:                                 * arguments for this procedure invocation. */
        !           158:     char **argv;               /* Array of arguments. */
        !           159:     struct CallFrame *callerPtr;
        !           160:                                /* Frame of procedure that invoked this one
        !           161:                                 * (NULL if level == 1). */
        !           162:     struct CallFrame *callerVarPtr;
        !           163:                                /* Frame used by caller for accessing local
        !           164:                                 * variables (same as callerPtr unless an
        !           165:                                 * "uplevel" command was active in the
        !           166:                                 * caller).  This field is used in the
        !           167:                                 * implementation of "uplevel". */
        !           168: } CallFrame;
        !           169: 
        !           170: /*
        !           171:  * The structure below defines one history event (a previously-executed
        !           172:  * command that can be re-executed in whole or in part).
        !           173:  */
        !           174: 
        !           175: typedef struct {
        !           176:     char *command;             /* String containing previously-executed
        !           177:                                 * command. */
        !           178:     int bytesAvl;              /* Total # of bytes available at *event (not
        !           179:                                 * all are necessarily in use now). */
        !           180: } HistoryEvent;
        !           181: 
        !           182: /*
        !           183:  * The structure below defines a pending revision to the most recent
        !           184:  * history event.  Changes are linked together into a list and applied
        !           185:  * during the next call to Tcl_RecordHistory.  See the comments at the
        !           186:  * beginning of tclHistory.c for information on revisions.
        !           187:  */
        !           188: 
        !           189: typedef struct HistoryRev {
        !           190:     int firstIndex;            /* Index of the first byte to replace in
        !           191:                                 * current history event. */
        !           192:     int lastIndex;             /* Index of last byte to replace in
        !           193:                                 * current history event. */
        !           194:     int newSize;               /* Number of bytes in newBytes. */
        !           195:     char *newBytes;            /* Replacement for the range given by
        !           196:                                 * firstIndex and lastIndex. */
        !           197:     struct HistoryRev *nextPtr;        /* Next in chain of revisions to apply, or
        !           198:                                 * NULL for end of list. */
        !           199: } HistoryRev;
        !           200: 
        !           201: /*
        !           202:  * This structure defines an interpreter, which is a collection of commands
        !           203:  * plus other state information related to interpreting commands, such as
        !           204:  * variable storage.  The lists of commands and variables are sorted by usage:
        !           205:  * each time a command or variable is used it is pulled to the front of its
        !           206:  * list.
        !           207:  */
        !           208: 
        !           209: typedef struct Interp {
        !           210: 
        !           211:     /*
        !           212:      * Note:  the first three fields must match exactly the fields in
        !           213:      * a Tcl_Interp struct (see tcl.h).  If you change one, be sure to
        !           214:      * change the other.
        !           215:      */
        !           216: 
        !           217:     char *result;              /* Points to result returned by last
        !           218:                                 * command. */
        !           219:     int dynamic;               /* Non-zero means result is dynamically-
        !           220:                                 * allocated and must be freed by Tcl_Eval
        !           221:                                 * before executing the next command. */
        !           222:     int errorLine;             /* When TCL_ERROR is returned, this gives
        !           223:                                 * the line number within the command where
        !           224:                                 * the error occurred (1 means first line). */
        !           225:     Command *commandPtr;       /* First command in list containing all
        !           226:                                 * commands defined for this table. */
        !           227: 
        !           228:     /*
        !           229:      * Information related to procedures and variables.  See tclProc.c
        !           230:      * for usage.
        !           231:      */
        !           232: 
        !           233:     Var *globalPtr;            /* First in list of all global variables for
        !           234:                                 * this command table. */
        !           235:     Var *localPtr;             /* First in list of all local variables and
        !           236:                                 * arguments for the Tcl procedure that is
        !           237:                                 * currently being executed.  If no procedure
        !           238:                                 * is being executed, or if it has no vars or
        !           239:                                 * args, this will be NULL. */
        !           240:     int numLevels;             /* Keeps track of how many nested calls to
        !           241:                                 * Tcl_Eval are in progress for this
        !           242:                                 * interpreter.  It's used to delay deletion
        !           243:                                 * of the table until all Tcl_Eval invocations
        !           244:                                 * are completed. */
        !           245:     CallFrame *framePtr;       /* If a procedure is being executed, this
        !           246:                                 * points to the call frame for the current
        !           247:                                 * procedure (most recently-called).  NULL
        !           248:                                 * means no procedure is active. */
        !           249:     CallFrame *varFramePtr;    /* Points to the call frame whose variables
        !           250:                                 * are currently in use (same as framePtr
        !           251:                                 * unless an "uplevel" command is being
        !           252:                                 * executed).  NULL means no procedure is
        !           253:                                 * active or "uplevel 0" is being exec'ed. */
        !           254: 
        !           255:     /*
        !           256:      * Information related to history:
        !           257:      */
        !           258: 
        !           259:     int numEvents;             /* Number of previously-executed commands
        !           260:                                 * to retain. */
        !           261:     HistoryEvent *events;      /* Array containing numEvents entries
        !           262:                                 * (dynamically allocated). */
        !           263:     int curEvent;              /* Index into events of place where current
        !           264:                                 * (or most recent) command is recorded. */
        !           265:     int curEventNum;           /* Event number associated with the slot
        !           266:                                 * given by curEvent. */
        !           267:     HistoryRev *revPtr;                /* First in list of pending revisions. */
        !           268:     char *historyFirst;                /* First char. of current command executed
        !           269:                                 * from history module.  NULL means don't
        !           270:                                 * do history revision (see tclHistory.c
        !           271:                                 * for details on revision). */
        !           272:     char *evalFirst;           /* If TCL_RECORD_BOUNDS flag set, Tcl_Eval
        !           273:                                 * sets this field to point to the first
        !           274:                                 * char. of text from which the current
        !           275:                                 * command came.  Otherwise Tcl_Eval sets
        !           276:                                 * this to NULL. */
        !           277:     char *evalLast;            /* Similar to evalFirst, except points to
        !           278:                                 * last character of current command. */
        !           279: 
        !           280:     /*
        !           281:      * Miscellaneous information:
        !           282:      */
        !           283: 
        !           284:     int cmdCount;              /* Total number of times a command procedure
        !           285:                                 * has been called for this interpreter. */
        !           286:     int noEval;                        /* Non-zero means no commands should actually
        !           287:                                 * be executed:  just parse only.  Used in
        !           288:                                 * expressions when the result is already
        !           289:                                 * determined. */
        !           290:     int flags;                 /* Various flag bits.  See below. */
        !           291:     Trace *tracePtr;           /* List of traces for this interpreter. */
        !           292:     InterpCallback *callbackPtr;/* List of callbacks to invoke when
        !           293:                                 * interpreter is deleted. */
        !           294:     char resultSpace[TCL_RESULT_SIZE];
        !           295:                                /* Static space for storing small results. */
        !           296: } Interp;
        !           297: 
        !           298: /*
        !           299:  * Flag bits for Interp structures:
        !           300:  *
        !           301:  * DELETED:            Non-zero means the interpreter has been deleted:
        !           302:  *                     don't process any more commands for it, and destroy
        !           303:  *                     the structure as soon as all nested invocations of
        !           304:  *                     Tcl_Eval are done.
        !           305:  * ERR_IN_PROGRESS:    Non-zero means an error unwind is already in progress.
        !           306:  *                     Zero means a command proc has been invoked since last
        !           307:  *                     error occured.
        !           308:  * ERR_ALREADY_LOGGED: Non-zero means information has already been logged
        !           309:  *                     in $errorInfo for the current Tcl_Eval instance,
        !           310:  *                     so Tcl_Eval needn't log it (used to implement the
        !           311:  *                     "error message log" command).
        !           312:  */
        !           313: 
        !           314: #define DELETED                        1
        !           315: #define ERR_IN_PROGRESS                2
        !           316: #define ERR_ALREADY_LOGGED     4
        !           317: 
        !           318: /*
        !           319:  * Additional flags passed to Tcl_Eval.  See tcl.h for other flags to
        !           320:  * Tcl_Eval;  these ones are only used internally by Tcl.
        !           321:  *
        !           322:  * TCL_RECORD_BOUNDS   Tells Tcl_Eval to record information in the
        !           323:  *                     evalFirst and evalLast fields for each command
        !           324:  *                     executed directly from the string (top-level
        !           325:  *                     commands and those from command substitution).
        !           326:  */
        !           327: 
        !           328: #define TCL_RECORD_BOUNDS      0x100
        !           329: 
        !           330: /*
        !           331:  * Maximum number of levels of nesting permitted in Tcl commands.
        !           332:  */
        !           333: 
        !           334: #define MAX_NESTING_DEPTH      100
        !           335: 
        !           336: /*
        !           337:  * Procedures shared among Tcl modules but not used by the outside
        !           338:  * world:
        !           339:  */
        !           340: 
        !           341: extern void            TclCopyAndCollapse();
        !           342: extern void            TclDeleteVars();
        !           343: extern Command *       TclFindCmd();
        !           344: extern int             TclFindElement();
        !           345: extern Proc *          TclFindProc();
        !           346: extern Proc *          TclIsProc();
        !           347: extern char *          TclWordEnd();
        !           348: 
        !           349: #endif _TCLINT

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