/* * tclTrace.c -- * * This file contains code to handle most trace management. * * Copyright (c) 1987-1993 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright (c) 1998-2000 Scriptics Corporation. * Copyright (c) 2002 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: tclTrace.c,v 1.8 2004/02/17 04:56:01 hobbs Exp $ */ #include "tclInt.h" /* * Structure used to hold information about variable traces: */ typedef struct { int flags; /* Operations for which Tcl command is * to be invoked. */ size_t length; /* Number of non-NULL chars. in command. */ char command[4]; /* Space for Tcl command to invoke. Actual * size will be as large as necessary to * hold command. This field must be the * last in the structure, so that it can * be larger than 4 bytes. */ } TraceVarInfo; /* * Structure used to hold information about command traces: */ typedef struct { int flags; /* Operations for which Tcl command is * to be invoked. */ size_t length; /* Number of non-NULL chars. in command. */ Tcl_Trace stepTrace; /* Used for execution traces, when tracing * inside the given command */ int startLevel; /* Used for bookkeeping with step execution * traces, store the level at which the step * trace was invoked */ char *startCmd; /* Used for bookkeeping with step execution * traces, store the command name which invoked * step trace */ int curFlags; /* Trace flags for the current command */ int curCode; /* Return code for the current command */ int refCount; /* Used to ensure this structure is * not deleted too early. Keeps track * of how many pieces of code have * a pointer to this structure. */ char command[4]; /* Space for Tcl command to invoke. Actual * size will be as large as necessary to * hold command. This field must be the * last in the structure, so that it can * be larger than 4 bytes. */ } TraceCommandInfo; /* * Used by command execution traces. Note that we assume in the code * that the first two defines are exactly 4 times the * 'TCL_TRACE_ENTER_EXEC' and 'TCL_TRACE_LEAVE_EXEC' constants. * * TCL_TRACE_ENTER_DURING_EXEC - Trace each command inside the command * currently being traced, before execution. * TCL_TRACE_LEAVE_DURING_EXEC - Trace each command inside the command * currently being traced, after execution. * TCL_TRACE_ANY_EXEC - OR'd combination of all EXEC flags. * TCL_TRACE_EXEC_IN_PROGRESS - The callback procedure on this trace * is currently executing. Therefore we * don't let further traces execute. * TCL_TRACE_EXEC_DIRECT - This execution trace is triggered directly * by the command being traced, not because * of an internal trace. * The flags 'TCL_TRACE_DESTROYED' and 'TCL_INTERP_DESTROYED' may also * be used in command execution traces. */ #define TCL_TRACE_ENTER_DURING_EXEC 4 #define TCL_TRACE_LEAVE_DURING_EXEC 8 #define TCL_TRACE_ANY_EXEC 15 #define TCL_TRACE_EXEC_IN_PROGRESS 0x10 #define TCL_TRACE_EXEC_DIRECT 0x20 /* * Forward declarations for procedures defined in this file: */ typedef int (Tcl_TraceTypeObjCmd) _ANSI_ARGS_((Tcl_Interp *interp, int optionIndex, int objc, Tcl_Obj *CONST objv[])); Tcl_TraceTypeObjCmd TclTraceVariableObjCmd; Tcl_TraceTypeObjCmd TclTraceCommandObjCmd; Tcl_TraceTypeObjCmd TclTraceExecutionObjCmd; /* * Each subcommand has a number of 'types' to which it can apply. * Currently 'execution', 'command' and 'variable' are the only * types supported. These three arrays MUST be kept in sync! * In the future we may provide an API to add to the list of * supported trace types. */ static CONST char *traceTypeOptions[] = { "execution", "command", "variable", (char*) NULL }; static Tcl_TraceTypeObjCmd* traceSubCmds[] = { TclTraceExecutionObjCmd, TclTraceCommandObjCmd, TclTraceVariableObjCmd, }; /* * Declarations for local procedures to this file: */ static int CallTraceProcedure _ANSI_ARGS_((Tcl_Interp *interp, Trace *tracePtr, Command *cmdPtr, CONST char *command, int numChars, int objc, Tcl_Obj *CONST objv[])); static char * TraceVarProc _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, CONST char *name1, CONST char *name2, int flags)); static void TraceCommandProc _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, CONST char *oldName, CONST char *newName, int flags)); static Tcl_CmdObjTraceProc TraceExecutionProc; static int StringTraceProc _ANSI_ARGS_((ClientData clientData, Tcl_Interp* interp, int level, CONST char* command, Tcl_Command commandInfo, int objc, Tcl_Obj *CONST objv[])); static void StringTraceDeleteProc _ANSI_ARGS_((ClientData clientData)); static void DisposeTraceResult _ANSI_ARGS_((int flags, char *result)); /* * The following structure holds the client data for string-based * trace procs */ typedef struct StringTraceData { ClientData clientData; /* Client data from Tcl_CreateTrace */ Tcl_CmdTraceProc* proc; /* Trace procedure from Tcl_CreateTrace */ } StringTraceData; /* *---------------------------------------------------------------------- * * Tcl_TraceObjCmd -- * * This procedure is invoked to process the "trace" Tcl command. * See the user documentation for details on what it does. * * Standard syntax as of Tcl 8.4 is * * trace {add|info|remove} {command|variable} name ops cmd * * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_TraceObjCmd(dummy, interp, objc, objv) ClientData dummy; /* Not used. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { int optionIndex, commandLength; char *name, *flagOps, *command, *p; size_t length; /* Main sub commands to 'trace' */ static CONST char *traceOptions[] = { "add", "info", "remove", #ifndef TCL_REMOVE_OBSOLETE_TRACES "variable", "vdelete", "vinfo", #endif (char *) NULL }; /* 'OLD' options are pre-Tcl-8.4 style */ enum traceOptions { TRACE_ADD, TRACE_INFO, TRACE_REMOVE, #ifndef TCL_REMOVE_OBSOLETE_TRACES TRACE_OLD_VARIABLE, TRACE_OLD_VDELETE, TRACE_OLD_VINFO #endif }; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], traceOptions, "option", 0, &optionIndex) != TCL_OK) { return TCL_ERROR; } switch ((enum traceOptions) optionIndex) { case TRACE_ADD: case TRACE_REMOVE: { /* * All sub commands of trace add/remove must take at least * one more argument. Beyond that we let the subcommand itself * control the argument structure. */ int typeIndex; if (objc < 3) { Tcl_WrongNumArgs(interp, 2, objv, "type ?arg arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[2], traceTypeOptions, "option", 0, &typeIndex) != TCL_OK) { return TCL_ERROR; } return (traceSubCmds[typeIndex])(interp, optionIndex, objc, objv); } case TRACE_INFO: { /* * All sub commands of trace info must take exactly two * more arguments which name the type of thing being * traced and the name of the thing being traced. */ int typeIndex; if (objc < 3) { /* * Delegate other complaints to the type-specific code * which can give a better error message. */ Tcl_WrongNumArgs(interp, 2, objv, "type name"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[2], traceTypeOptions, "option", 0, &typeIndex) != TCL_OK) { return TCL_ERROR; } return (traceSubCmds[typeIndex])(interp, optionIndex, objc, objv); break; } #ifndef TCL_REMOVE_OBSOLETE_TRACES case TRACE_OLD_VARIABLE: { int flags; TraceVarInfo *tvarPtr; if (objc != 5) { Tcl_WrongNumArgs(interp, 2, objv, "name ops command"); return TCL_ERROR; } flags = 0; flagOps = Tcl_GetString(objv[3]); for (p = flagOps; *p != 0; p++) { if (*p == 'r') { flags |= TCL_TRACE_READS; } else if (*p == 'w') { flags |= TCL_TRACE_WRITES; } else if (*p == 'u') { flags |= TCL_TRACE_UNSETS; } else if (*p == 'a') { flags |= TCL_TRACE_ARRAY; } else { goto badVarOps; } } if (flags == 0) { goto badVarOps; } flags |= TCL_TRACE_OLD_STYLE; command = Tcl_GetStringFromObj(objv[4], &commandLength); length = (size_t) commandLength; tvarPtr = (TraceVarInfo *) ckalloc((unsigned) (sizeof(TraceVarInfo) - sizeof(tvarPtr->command) + length + 1)); tvarPtr->flags = flags; tvarPtr->length = length; flags |= TCL_TRACE_UNSETS | TCL_TRACE_RESULT_OBJECT; strcpy(tvarPtr->command, command); name = Tcl_GetString(objv[2]); if (Tcl_TraceVar(interp, name, flags, TraceVarProc, (ClientData) tvarPtr) != TCL_OK) { ckfree((char *) tvarPtr); return TCL_ERROR; } break; } case TRACE_OLD_VDELETE: { int flags; TraceVarInfo *tvarPtr; ClientData clientData; if (objc != 5) { Tcl_WrongNumArgs(interp, 2, objv, "name ops command"); return TCL_ERROR; } flags = 0; flagOps = Tcl_GetString(objv[3]); for (p = flagOps; *p != 0; p++) { if (*p == 'r') { flags |= TCL_TRACE_READS; } else if (*p == 'w') { flags |= TCL_TRACE_WRITES; } else if (*p == 'u') { flags |= TCL_TRACE_UNSETS; } else if (*p == 'a') { flags |= TCL_TRACE_ARRAY; } else { goto badVarOps; } } if (flags == 0) { goto badVarOps; } flags |= TCL_TRACE_OLD_STYLE; /* * Search through all of our traces on this variable to * see if there's one with the given command. If so, then * delete the first one that matches. */ command = Tcl_GetStringFromObj(objv[4], &commandLength); length = (size_t) commandLength; clientData = 0; name = Tcl_GetString(objv[2]); while ((clientData = Tcl_VarTraceInfo(interp, name, 0, TraceVarProc, clientData)) != 0) { tvarPtr = (TraceVarInfo *) clientData; if ((tvarPtr->length == length) && (tvarPtr->flags == flags) && (strncmp(command, tvarPtr->command, (size_t) length) == 0)) { Tcl_UntraceVar2(interp, name, NULL, flags | TCL_TRACE_UNSETS | TCL_TRACE_RESULT_OBJECT, TraceVarProc, clientData); Tcl_EventuallyFree((ClientData) tvarPtr, TCL_DYNAMIC); break; } } break; } case TRACE_OLD_VINFO: { ClientData clientData; char ops[5]; Tcl_Obj *resultListPtr, *pairObjPtr, *elemObjPtr; if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "name"); return TCL_ERROR; } resultListPtr = Tcl_GetObjResult(interp); clientData = 0; name = Tcl_GetString(objv[2]); while ((clientData = Tcl_VarTraceInfo(interp, name, 0, TraceVarProc, clientData)) != 0) { TraceVarInfo *tvarPtr = (TraceVarInfo *) clientData; pairObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); p = ops; if (tvarPtr->flags & TCL_TRACE_READS) { *p = 'r'; p++; } if (tvarPtr->flags & TCL_TRACE_WRITES) { *p = 'w'; p++; } if (tvarPtr->flags & TCL_TRACE_UNSETS) { *p = 'u'; p++; } if (tvarPtr->flags & TCL_TRACE_ARRAY) { *p = 'a'; p++; } *p = '\0'; /* * Build a pair (2-item list) with the ops string as * the first obj element and the tvarPtr->command string * as the second obj element. Append the pair (as an * element) to the end of the result object list. */ elemObjPtr = Tcl_NewStringObj(ops, -1); Tcl_ListObjAppendElement(NULL, pairObjPtr, elemObjPtr); elemObjPtr = Tcl_NewStringObj(tvarPtr->command, -1); Tcl_ListObjAppendElement(NULL, pairObjPtr, elemObjPtr); Tcl_ListObjAppendElement(interp, resultListPtr, pairObjPtr); } Tcl_SetObjResult(interp, resultListPtr); break; } #endif /* TCL_REMOVE_OBSOLETE_TRACES */ } return TCL_OK; badVarOps: Tcl_AppendResult(interp, "bad operations \"", flagOps, "\": should be one or more of rwua", (char *) NULL); return TCL_ERROR; } /* *---------------------------------------------------------------------- * * TclTraceExecutionObjCmd -- * * Helper function for Tcl_TraceObjCmd; implements the * [trace {add|remove|info} execution ...] subcommands. * See the user documentation for details on what these do. * * Results: * Standard Tcl result. * * Side effects: * Depends on the operation (add, remove, or info) being performed; * may add or remove command traces on a command. * *---------------------------------------------------------------------- */ int TclTraceExecutionObjCmd(interp, optionIndex, objc, objv) Tcl_Interp *interp; /* Current interpreter. */ int optionIndex; /* Add, info or remove */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { int commandLength, index; char *name, *command; size_t length; enum traceOptions { TRACE_ADD, TRACE_INFO, TRACE_REMOVE }; static CONST char *opStrings[] = { "enter", "leave", "enterstep", "leavestep", (char *) NULL }; enum operations { TRACE_EXEC_ENTER, TRACE_EXEC_LEAVE, TRACE_EXEC_ENTER_STEP, TRACE_EXEC_LEAVE_STEP }; switch ((enum traceOptions) optionIndex) { case TRACE_ADD: case TRACE_REMOVE: { int flags = 0; int i, listLen, result; Tcl_Obj **elemPtrs; if (objc != 6) { Tcl_WrongNumArgs(interp, 3, objv, "name opList command"); return TCL_ERROR; } /* * Make sure the ops argument is a list object; get its length and * a pointer to its array of element pointers. */ result = Tcl_ListObjGetElements(interp, objv[4], &listLen, &elemPtrs); if (result != TCL_OK) { return result; } if (listLen == 0) { Tcl_SetResult(interp, "bad operation list \"\": must be " "one or more of enter, leave, enterstep, or leavestep", TCL_STATIC); return TCL_ERROR; } for (i = 0; i < listLen; i++) { if (Tcl_GetIndexFromObj(interp, elemPtrs[i], opStrings, "operation", TCL_EXACT, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum operations) index) { case TRACE_EXEC_ENTER: flags |= TCL_TRACE_ENTER_EXEC; break; case TRACE_EXEC_LEAVE: flags |= TCL_TRACE_LEAVE_EXEC; break; case TRACE_EXEC_ENTER_STEP: flags |= TCL_TRACE_ENTER_DURING_EXEC; break; case TRACE_EXEC_LEAVE_STEP: flags |= TCL_TRACE_LEAVE_DURING_EXEC; break; } } command = Tcl_GetStringFromObj(objv[5], &commandLength); length = (size_t) commandLength; if ((enum traceOptions) optionIndex == TRACE_ADD) { TraceCommandInfo *tcmdPtr; tcmdPtr = (TraceCommandInfo *) ckalloc((unsigned) (sizeof(TraceCommandInfo) - sizeof(tcmdPtr->command) + length + 1)); tcmdPtr->flags = flags; tcmdPtr->stepTrace = NULL; tcmdPtr->startLevel = 0; tcmdPtr->startCmd = NULL; tcmdPtr->length = length; tcmdPtr->refCount = 1; flags |= TCL_TRACE_DELETE; if (flags & (TCL_TRACE_ENTER_DURING_EXEC | TCL_TRACE_LEAVE_DURING_EXEC)) { flags |= (TCL_TRACE_ENTER_EXEC | TCL_TRACE_LEAVE_EXEC); } strcpy(tcmdPtr->command, command); name = Tcl_GetString(objv[3]); if (Tcl_TraceCommand(interp, name, flags, TraceCommandProc, (ClientData) tcmdPtr) != TCL_OK) { ckfree((char *) tcmdPtr); return TCL_ERROR; } } else { /* * Search through all of our traces on this command to * see if there's one with the given command. If so, then * delete the first one that matches. */ TraceCommandInfo *tcmdPtr; ClientData clientData = NULL; name = Tcl_GetString(objv[3]); /* First ensure the name given is valid */ if (Tcl_FindCommand(interp, name, NULL, TCL_LEAVE_ERR_MSG) == NULL) { return TCL_ERROR; } while ((clientData = Tcl_CommandTraceInfo(interp, name, 0, TraceCommandProc, clientData)) != NULL) { tcmdPtr = (TraceCommandInfo *) clientData; /* * In checking the 'flags' field we must remove any * extraneous flags which may have been temporarily * added by various pieces of the trace mechanism. */ if ((tcmdPtr->length == length) && ((tcmdPtr->flags & (TCL_TRACE_ANY_EXEC | TCL_TRACE_RENAME | TCL_TRACE_DELETE)) == flags) && (strncmp(command, tcmdPtr->command, (size_t) length) == 0)) { flags |= TCL_TRACE_DELETE; if (flags & (TCL_TRACE_ENTER_DURING_EXEC | TCL_TRACE_LEAVE_DURING_EXEC)) { flags |= (TCL_TRACE_ENTER_EXEC | TCL_TRACE_LEAVE_EXEC); } Tcl_UntraceCommand(interp, name, flags, TraceCommandProc, clientData); if (tcmdPtr->stepTrace != NULL) { /* * We need to remove the interpreter-wide trace * which we created to allow 'step' traces. */ Tcl_DeleteTrace(interp, tcmdPtr->stepTrace); tcmdPtr->stepTrace = NULL; if (tcmdPtr->startCmd != NULL) { ckfree((char *)tcmdPtr->startCmd); } } if (tcmdPtr->flags & TCL_TRACE_EXEC_IN_PROGRESS) { /* Postpone deletion */ tcmdPtr->flags = 0; } if ((--tcmdPtr->refCount) <= 0) { ckfree((char*)tcmdPtr); } break; } } } break; } case TRACE_INFO: { ClientData clientData; Tcl_Obj *resultListPtr, *eachTraceObjPtr, *elemObjPtr; if (objc != 4) { Tcl_WrongNumArgs(interp, 3, objv, "name"); return TCL_ERROR; } clientData = NULL; name = Tcl_GetString(objv[3]); /* First ensure the name given is valid */ if (Tcl_FindCommand(interp, name, NULL, TCL_LEAVE_ERR_MSG) == NULL) { return TCL_ERROR; } resultListPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); while ((clientData = Tcl_CommandTraceInfo(interp, name, 0, TraceCommandProc, clientData)) != NULL) { int numOps = 0; TraceCommandInfo *tcmdPtr = (TraceCommandInfo *) clientData; /* * Build a list with the ops list as the first obj * element and the tcmdPtr->command string as the * second obj element. Append this list (as an * element) to the end of the result object list. */ elemObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); Tcl_IncrRefCount(elemObjPtr); if (tcmdPtr->flags & TCL_TRACE_ENTER_EXEC) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("enter",5)); } if (tcmdPtr->flags & TCL_TRACE_LEAVE_EXEC) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("leave",5)); } if (tcmdPtr->flags & TCL_TRACE_ENTER_DURING_EXEC) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("enterstep",9)); } if (tcmdPtr->flags & TCL_TRACE_LEAVE_DURING_EXEC) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("leavestep",9)); } Tcl_ListObjLength(NULL, elemObjPtr, &numOps); if (0 == numOps) { Tcl_DecrRefCount(elemObjPtr); continue; } eachTraceObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); Tcl_ListObjAppendElement(NULL, eachTraceObjPtr, elemObjPtr); Tcl_DecrRefCount(elemObjPtr); elemObjPtr = NULL; Tcl_ListObjAppendElement(NULL, eachTraceObjPtr, Tcl_NewStringObj(tcmdPtr->command, -1)); Tcl_ListObjAppendElement(interp, resultListPtr, eachTraceObjPtr); } Tcl_SetObjResult(interp, resultListPtr); break; } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclTraceCommandObjCmd -- * * Helper function for Tcl_TraceObjCmd; implements the * [trace {add|info|remove} command ...] subcommands. * See the user documentation for details on what these do. * * Results: * Standard Tcl result. * * Side effects: * Depends on the operation (add, remove, or info) being performed; * may add or remove command traces on a command. * *---------------------------------------------------------------------- */ int TclTraceCommandObjCmd(interp, optionIndex, objc, objv) Tcl_Interp *interp; /* Current interpreter. */ int optionIndex; /* Add, info or remove */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { int commandLength, index; char *name, *command; size_t length; enum traceOptions { TRACE_ADD, TRACE_INFO, TRACE_REMOVE }; static CONST char *opStrings[] = { "delete", "rename", (char *) NULL }; enum operations { TRACE_CMD_DELETE, TRACE_CMD_RENAME }; switch ((enum traceOptions) optionIndex) { case TRACE_ADD: case TRACE_REMOVE: { int flags = 0; int i, listLen, result; Tcl_Obj **elemPtrs; if (objc != 6) { Tcl_WrongNumArgs(interp, 3, objv, "name opList command"); return TCL_ERROR; } /* * Make sure the ops argument is a list object; get its length and * a pointer to its array of element pointers. */ result = Tcl_ListObjGetElements(interp, objv[4], &listLen, &elemPtrs); if (result != TCL_OK) { return result; } if (listLen == 0) { Tcl_SetResult(interp, "bad operation list \"\": must be " "one or more of delete or rename", TCL_STATIC); return TCL_ERROR; } for (i = 0; i < listLen; i++) { if (Tcl_GetIndexFromObj(interp, elemPtrs[i], opStrings, "operation", TCL_EXACT, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum operations) index) { case TRACE_CMD_RENAME: flags |= TCL_TRACE_RENAME; break; case TRACE_CMD_DELETE: flags |= TCL_TRACE_DELETE; break; } } command = Tcl_GetStringFromObj(objv[5], &commandLength); length = (size_t) commandLength; if ((enum traceOptions) optionIndex == TRACE_ADD) { TraceCommandInfo *tcmdPtr; tcmdPtr = (TraceCommandInfo *) ckalloc((unsigned) (sizeof(TraceCommandInfo) - sizeof(tcmdPtr->command) + length + 1)); tcmdPtr->flags = flags; tcmdPtr->stepTrace = NULL; tcmdPtr->startLevel = 0; tcmdPtr->startCmd = NULL; tcmdPtr->length = length; tcmdPtr->refCount = 1; flags |= TCL_TRACE_DELETE; strcpy(tcmdPtr->command, command); name = Tcl_GetString(objv[3]); if (Tcl_TraceCommand(interp, name, flags, TraceCommandProc, (ClientData) tcmdPtr) != TCL_OK) { ckfree((char *) tcmdPtr); return TCL_ERROR; } } else { /* * Search through all of our traces on this command to * see if there's one with the given command. If so, then * delete the first one that matches. */ TraceCommandInfo *tcmdPtr; ClientData clientData = NULL; name = Tcl_GetString(objv[3]); /* First ensure the name given is valid */ if (Tcl_FindCommand(interp, name, NULL, TCL_LEAVE_ERR_MSG) == NULL) { return TCL_ERROR; } while ((clientData = Tcl_CommandTraceInfo(interp, name, 0, TraceCommandProc, clientData)) != NULL) { tcmdPtr = (TraceCommandInfo *) clientData; if ((tcmdPtr->length == length) && (tcmdPtr->flags == flags) && (strncmp(command, tcmdPtr->command, (size_t) length) == 0)) { Tcl_UntraceCommand(interp, name, flags | TCL_TRACE_DELETE, TraceCommandProc, clientData); tcmdPtr->flags |= TCL_TRACE_DESTROYED; if ((--tcmdPtr->refCount) <= 0) { ckfree((char *) tcmdPtr); } break; } } } break; } case TRACE_INFO: { ClientData clientData; Tcl_Obj *resultListPtr, *eachTraceObjPtr, *elemObjPtr; if (objc != 4) { Tcl_WrongNumArgs(interp, 3, objv, "name"); return TCL_ERROR; } clientData = NULL; name = Tcl_GetString(objv[3]); /* First ensure the name given is valid */ if (Tcl_FindCommand(interp, name, NULL, TCL_LEAVE_ERR_MSG) == NULL) { return TCL_ERROR; } resultListPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); while ((clientData = Tcl_CommandTraceInfo(interp, name, 0, TraceCommandProc, clientData)) != NULL) { int numOps = 0; TraceCommandInfo *tcmdPtr = (TraceCommandInfo *) clientData; /* * Build a list with the ops list as * the first obj element and the tcmdPtr->command string * as the second obj element. Append this list (as an * element) to the end of the result object list. */ elemObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); Tcl_IncrRefCount(elemObjPtr); if (tcmdPtr->flags & TCL_TRACE_RENAME) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("rename",6)); } if (tcmdPtr->flags & TCL_TRACE_DELETE) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("delete",6)); } Tcl_ListObjLength(NULL, elemObjPtr, &numOps); if (0 == numOps) { Tcl_DecrRefCount(elemObjPtr); continue; } eachTraceObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); Tcl_ListObjAppendElement(NULL, eachTraceObjPtr, elemObjPtr); Tcl_DecrRefCount(elemObjPtr); elemObjPtr = Tcl_NewStringObj(tcmdPtr->command, -1); Tcl_ListObjAppendElement(NULL, eachTraceObjPtr, elemObjPtr); Tcl_ListObjAppendElement(interp, resultListPtr, eachTraceObjPtr); } Tcl_SetObjResult(interp, resultListPtr); break; } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclTraceVariableObjCmd -- * * Helper function for Tcl_TraceObjCmd; implements the * [trace {add|info|remove} variable ...] subcommands. * See the user documentation for details on what these do. * * Results: * Standard Tcl result. * * Side effects: * Depends on the operation (add, remove, or info) being performed; * may add or remove variable traces on a variable. * *---------------------------------------------------------------------- */ int TclTraceVariableObjCmd(interp, optionIndex, objc, objv) Tcl_Interp *interp; /* Current interpreter. */ int optionIndex; /* Add, info or remove */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { int commandLength, index; char *name, *command; size_t length; enum traceOptions { TRACE_ADD, TRACE_INFO, TRACE_REMOVE }; static CONST char *opStrings[] = { "array", "read", "unset", "write", (char *) NULL }; enum operations { TRACE_VAR_ARRAY, TRACE_VAR_READ, TRACE_VAR_UNSET, TRACE_VAR_WRITE }; switch ((enum traceOptions) optionIndex) { case TRACE_ADD: case TRACE_REMOVE: { int flags = 0; int i, listLen, result; Tcl_Obj **elemPtrs; if (objc != 6) { Tcl_WrongNumArgs(interp, 3, objv, "name opList command"); return TCL_ERROR; } /* * Make sure the ops argument is a list object; get its length and * a pointer to its array of element pointers. */ result = Tcl_ListObjGetElements(interp, objv[4], &listLen, &elemPtrs); if (result != TCL_OK) { return result; } if (listLen == 0) { Tcl_SetResult(interp, "bad operation list \"\": must be " "one or more of array, read, unset, or write", TCL_STATIC); return TCL_ERROR; } for (i = 0; i < listLen ; i++) { if (Tcl_GetIndexFromObj(interp, elemPtrs[i], opStrings, "operation", TCL_EXACT, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum operations) index) { case TRACE_VAR_ARRAY: flags |= TCL_TRACE_ARRAY; break; case TRACE_VAR_READ: flags |= TCL_TRACE_READS; break; case TRACE_VAR_UNSET: flags |= TCL_TRACE_UNSETS; break; case TRACE_VAR_WRITE: flags |= TCL_TRACE_WRITES; break; } } command = Tcl_GetStringFromObj(objv[5], &commandLength); length = (size_t) commandLength; if ((enum traceOptions) optionIndex == TRACE_ADD) { TraceVarInfo *tvarPtr; tvarPtr = (TraceVarInfo *) ckalloc((unsigned) (sizeof(TraceVarInfo) - sizeof(tvarPtr->command) + length + 1)); tvarPtr->flags = flags; tvarPtr->length = length; flags |= TCL_TRACE_UNSETS | TCL_TRACE_RESULT_OBJECT; strcpy(tvarPtr->command, command); name = Tcl_GetString(objv[3]); if (Tcl_TraceVar(interp, name, flags, TraceVarProc, (ClientData) tvarPtr) != TCL_OK) { ckfree((char *) tvarPtr); return TCL_ERROR; } } else { /* * Search through all of our traces on this variable to * see if there's one with the given command. If so, then * delete the first one that matches. */ TraceVarInfo *tvarPtr; ClientData clientData = 0; name = Tcl_GetString(objv[3]); while ((clientData = Tcl_VarTraceInfo(interp, name, 0, TraceVarProc, clientData)) != 0) { tvarPtr = (TraceVarInfo *) clientData; if ((tvarPtr->length == length) && (tvarPtr->flags == flags) && (strncmp(command, tvarPtr->command, (size_t) length) == 0)) { Tcl_UntraceVar2(interp, name, NULL, flags | TCL_TRACE_UNSETS | TCL_TRACE_RESULT_OBJECT, TraceVarProc, clientData); Tcl_EventuallyFree((ClientData) tvarPtr, TCL_DYNAMIC); break; } } } break; } case TRACE_INFO: { ClientData clientData; Tcl_Obj *resultListPtr, *eachTraceObjPtr, *elemObjPtr; if (objc != 4) { Tcl_WrongNumArgs(interp, 3, objv, "name"); return TCL_ERROR; } resultListPtr = Tcl_GetObjResult(interp); clientData = 0; name = Tcl_GetString(objv[3]); while ((clientData = Tcl_VarTraceInfo(interp, name, 0, TraceVarProc, clientData)) != 0) { TraceVarInfo *tvarPtr = (TraceVarInfo *) clientData; /* * Build a list with the ops list as * the first obj element and the tcmdPtr->command string * as the second obj element. Append this list (as an * element) to the end of the result object list. */ elemObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); if (tvarPtr->flags & TCL_TRACE_ARRAY) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("array", 5)); } if (tvarPtr->flags & TCL_TRACE_READS) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("read", 4)); } if (tvarPtr->flags & TCL_TRACE_WRITES) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("write", 5)); } if (tvarPtr->flags & TCL_TRACE_UNSETS) { Tcl_ListObjAppendElement(NULL, elemObjPtr, Tcl_NewStringObj("unset", 5)); } eachTraceObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL); Tcl_ListObjAppendElement(NULL, eachTraceObjPtr, elemObjPtr); elemObjPtr = Tcl_NewStringObj(tvarPtr->command, -1); Tcl_ListObjAppendElement(NULL, eachTraceObjPtr, elemObjPtr); Tcl_ListObjAppendElement(interp, resultListPtr, eachTraceObjPtr); } Tcl_SetObjResult(interp, resultListPtr); break; } } return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_CommandTraceInfo -- * * Return the clientData value associated with a trace on a * command. This procedure can also be used to step through * all of the traces on a particular command that have the * same trace procedure. * * Results: * The return value is the clientData value associated with * a trace on the given command. Information will only be * returned for a trace with proc as trace procedure. If * the clientData argument is NULL then the first such trace is * returned; otherwise, the next relevant one after the one * given by clientData will be returned. If the command * doesn't exist then an error message is left in the interpreter * and NULL is returned. Also, if there are no (more) traces for * the given command, NULL is returned. * * Side effects: * None. * *---------------------------------------------------------------------- */ ClientData Tcl_CommandTraceInfo(interp, cmdName, flags, proc, prevClientData) Tcl_Interp *interp; /* Interpreter containing command. */ CONST char *cmdName; /* Name of command. */ int flags; /* OR-ed combo or TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY (can be 0). */ Tcl_CommandTraceProc *proc; /* Procedure assocated with trace. */ ClientData prevClientData; /* If non-NULL, gives last value returned * by this procedure, so this call will * return the next trace after that one. * If NULL, this call will return the * first trace. */ { Command *cmdPtr; register CommandTrace *tracePtr; cmdPtr = (Command*)Tcl_FindCommand(interp, cmdName, NULL, TCL_LEAVE_ERR_MSG); if (cmdPtr == NULL) { return NULL; } /* * Find the relevant trace, if any, and return its clientData. */ tracePtr = cmdPtr->tracePtr; if (prevClientData != NULL) { for ( ; tracePtr != NULL; tracePtr = tracePtr->nextPtr) { if ((tracePtr->clientData == prevClientData) && (tracePtr->traceProc == proc)) { tracePtr = tracePtr->nextPtr; break; } } } for ( ; tracePtr != NULL; tracePtr = tracePtr->nextPtr) { if (tracePtr->traceProc == proc) { return tracePtr->clientData; } } return NULL; } /* *---------------------------------------------------------------------- * * Tcl_TraceCommand -- * * Arrange for rename/deletes to a command to cause a * procedure to be invoked, which can monitor the operations. * * Also optionally arrange for execution of that command * to cause a procedure to be invoked. * * Results: * A standard Tcl return value. * * Side effects: * A trace is set up on the command given by cmdName, such that * future changes to the command will be intermediated by * proc. See the manual entry for complete details on the calling * sequence for proc. * *---------------------------------------------------------------------- */ int Tcl_TraceCommand(interp, cmdName, flags, proc, clientData) Tcl_Interp *interp; /* Interpreter in which command is * to be traced. */ CONST char *cmdName; /* Name of command. */ int flags; /* OR-ed collection of bits, including any * of TCL_TRACE_RENAME, TCL_TRACE_DELETE, * and any of the TRACE_*_EXEC flags */ Tcl_CommandTraceProc *proc; /* Procedure to call when specified ops are * invoked upon cmdName. */ ClientData clientData; /* Arbitrary argument to pass to proc. */ { Command *cmdPtr; register CommandTrace *tracePtr; cmdPtr = (Command*)Tcl_FindCommand(interp, cmdName, NULL, TCL_LEAVE_ERR_MSG); if (cmdPtr == NULL) { return TCL_ERROR; } /* * Set up trace information. */ tracePtr = (CommandTrace *) ckalloc(sizeof(CommandTrace)); tracePtr->traceProc = proc; tracePtr->clientData = clientData; tracePtr->flags = flags & (TCL_TRACE_RENAME | TCL_TRACE_DELETE | TCL_TRACE_ANY_EXEC); tracePtr->nextPtr = cmdPtr->tracePtr; tracePtr->refCount = 1; cmdPtr->tracePtr = tracePtr; if (tracePtr->flags & TCL_TRACE_ANY_EXEC) { cmdPtr->flags |= CMD_HAS_EXEC_TRACES; } return TCL_OK; } /* *---------------------------------------------------------------------- * * Tcl_UntraceCommand -- * * Remove a previously-created trace for a command. * * Results: * None. * * Side effects: * If there exists a trace for the command given by cmdName * with the given flags, proc, and clientData, then that trace * is removed. * *---------------------------------------------------------------------- */ void Tcl_UntraceCommand(interp, cmdName, flags, proc, clientData) Tcl_Interp *interp; /* Interpreter containing command. */ CONST char *cmdName; /* Name of command. */ int flags; /* OR-ed collection of bits, including any * of TCL_TRACE_RENAME, TCL_TRACE_DELETE, * and any of the TRACE_*_EXEC flags */ Tcl_CommandTraceProc *proc; /* Procedure assocated with trace. */ ClientData clientData; /* Arbitrary argument to pass to proc. */ { register CommandTrace *tracePtr; CommandTrace *prevPtr; Command *cmdPtr; Interp *iPtr = (Interp *) interp; ActiveCommandTrace *activePtr; int hasExecTraces = 0; cmdPtr = (Command*)Tcl_FindCommand(interp, cmdName, NULL, TCL_LEAVE_ERR_MSG); if (cmdPtr == NULL) { return; } flags &= (TCL_TRACE_RENAME | TCL_TRACE_DELETE | TCL_TRACE_ANY_EXEC); for (tracePtr = cmdPtr->tracePtr, prevPtr = NULL; ; prevPtr = tracePtr, tracePtr = tracePtr->nextPtr) { if (tracePtr == NULL) { return; } if ((tracePtr->traceProc == proc) && ((tracePtr->flags & (TCL_TRACE_RENAME | TCL_TRACE_DELETE | TCL_TRACE_ANY_EXEC)) == flags) && (tracePtr->clientData == clientData)) { if (tracePtr->flags & TCL_TRACE_ANY_EXEC) { hasExecTraces = 1; } break; } } /* * The code below makes it possible to delete traces while traces * are active: it makes sure that the deleted trace won't be * processed by CallCommandTraces. */ for (activePtr = iPtr->activeCmdTracePtr; activePtr != NULL; activePtr = activePtr->nextPtr) { if (activePtr->nextTracePtr == tracePtr) { activePtr->nextTracePtr = tracePtr->nextPtr; } } if (prevPtr == NULL) { cmdPtr->tracePtr = tracePtr->nextPtr; } else { prevPtr->nextPtr = tracePtr->nextPtr; } tracePtr->flags = 0; if ((--tracePtr->refCount) <= 0) { ckfree((char*)tracePtr); } if (hasExecTraces) { for (tracePtr = cmdPtr->tracePtr, prevPtr = NULL; tracePtr != NULL ; prevPtr = tracePtr, tracePtr = tracePtr->nextPtr) { if (tracePtr->flags & TCL_TRACE_ANY_EXEC) { return; } } /* * None of the remaining traces on this command are execution * traces. We therefore remove this flag: */ cmdPtr->flags &= ~CMD_HAS_EXEC_TRACES; } } /* *---------------------------------------------------------------------- * * TraceCommandProc -- * * This procedure is called to handle command changes that have * been traced using the "trace" command, when using the * 'rename' or 'delete' options. * * Results: * None. * * Side effects: * Depends on the command associated with the trace. * *---------------------------------------------------------------------- */ /* ARGSUSED */ static void TraceCommandProc(clientData, interp, oldName, newName, flags) ClientData clientData; /* Information about the command trace. */ Tcl_Interp *interp; /* Interpreter containing command. */ CONST char *oldName; /* Name of command being changed. */ CONST char *newName; /* New name of command. Empty string * or NULL means command is being deleted * (renamed to ""). */ int flags; /* OR-ed bits giving operation and other * information. */ { Interp *iPtr = (Interp *) interp; Tcl_Obj *stateReturnOpts; Tcl_SavedResult state; TraceCommandInfo *tcmdPtr = (TraceCommandInfo *) clientData; int code; Tcl_DString cmd; tcmdPtr->refCount++; if ((tcmdPtr->flags & flags) && !(flags & TCL_INTERP_DESTROYED)) { /* * Generate a command to execute by appending list elements * for the old and new command name and the operation. */ Tcl_DStringInit(&cmd); Tcl_DStringAppend(&cmd, tcmdPtr->command, (int) tcmdPtr->length); Tcl_DStringAppendElement(&cmd, oldName); Tcl_DStringAppendElement(&cmd, (newName ? newName : "")); if (flags & TCL_TRACE_RENAME) { Tcl_DStringAppend(&cmd, " rename", 7); } else if (flags & TCL_TRACE_DELETE) { Tcl_DStringAppend(&cmd, " delete", 7); } /* * Execute the command. Save the interp's result used for the * command, including the value of iPtr->returnOpts which may be * modified when Tcl_Eval is invoked. We discard any object * result the command returns. * * Add the TCL_TRACE_DESTROYED flag to tcmdPtr to indicate to * other areas that this will be destroyed by us, otherwise a * double-free might occur depending on what the eval does. */ Tcl_SaveResult(interp, &state); stateReturnOpts = iPtr->returnOpts; Tcl_IncrRefCount(stateReturnOpts); if (flags & TCL_TRACE_DESTROYED) { tcmdPtr->flags |= TCL_TRACE_DESTROYED; } code = Tcl_EvalEx(interp, Tcl_DStringValue(&cmd), Tcl_DStringLength(&cmd), 0); if (code != TCL_OK) { /* We ignore errors in these traced commands */ } Tcl_RestoreResult(interp, &state); if (iPtr->returnOpts != stateReturnOpts) { Tcl_DecrRefCount(iPtr->returnOpts); iPtr->returnOpts = stateReturnOpts; Tcl_IncrRefCount(iPtr->returnOpts); } Tcl_DecrRefCount(stateReturnOpts); Tcl_DStringFree(&cmd); } /* * We delete when the trace was destroyed or if this is a delete trace, * because command deletes are unconditional, so the trace must go away. */ if (flags & (TCL_TRACE_DESTROYED | TCL_TRACE_DELETE)) { int untraceFlags = tcmdPtr->flags; if (tcmdPtr->stepTrace != NULL) { Tcl_DeleteTrace(interp, tcmdPtr->stepTrace); tcmdPtr->stepTrace = NULL; if (tcmdPtr->startCmd != NULL) { ckfree((char *)tcmdPtr->startCmd); } } if (tcmdPtr->flags & TCL_TRACE_EXEC_IN_PROGRESS) { /* Postpone deletion, until exec trace returns */ tcmdPtr->flags = 0; } /* * We need to construct the same flags for Tcl_UntraceCommand * as were passed to Tcl_TraceCommand. Reproduce the processing * of [trace add execution/command]. Be careful to keep this * code in sync with that. */ if (untraceFlags & TCL_TRACE_ANY_EXEC) { untraceFlags |= TCL_TRACE_DELETE; if (untraceFlags & (TCL_TRACE_ENTER_DURING_EXEC | TCL_TRACE_LEAVE_DURING_EXEC)) { untraceFlags |= (TCL_TRACE_ENTER_EXEC | TCL_TRACE_LEAVE_EXEC); } } else if (untraceFlags & TCL_TRACE_RENAME) { untraceFlags |= TCL_TRACE_DELETE; } /* * Remove the trace since TCL_TRACE_DESTROYED tells us to, or the * command we're tracing has just gone away. Then decrement the * clientData refCount that was set up by trace creation. */ Tcl_UntraceCommand(interp, oldName, untraceFlags, TraceCommandProc, clientData); tcmdPtr->refCount--; } if ((--tcmdPtr->refCount) <= 0) { ckfree((char*)tcmdPtr); } return; } /* *---------------------------------------------------------------------- * * TclCheckExecutionTraces -- * * Checks on all current command execution traces, and invokes * procedures which have been registered. This procedure can be * used by other code which performs execution to unify the * tracing system, so that execution traces will function for that * other code. * * For instance extensions like [incr Tcl] which use their * own execution technique can make use of Tcl's tracing. * * This procedure is called by 'TclEvalObjvInternal' * * Results: * The return value is a standard Tcl completion code such as * TCL_OK or TCL_ERROR, etc. * * Side effects: * Those side effects made by any trace procedures called. * *---------------------------------------------------------------------- */ int TclCheckExecutionTraces(interp, command, numChars, cmdPtr, code, traceFlags, objc, objv) Tcl_Interp *interp; /* The current interpreter. */ CONST char *command; /* Pointer to beginning of the current * command string. */ int numChars; /* The number of characters in 'command' * which are part of the command string. */ Command *cmdPtr; /* Points to command's Command struct. */ int code; /* The current result code. */ int traceFlags; /* Current tracing situation. */ int objc; /* Number of arguments for the command. */ Tcl_Obj *CONST objv[]; /* Pointers to Tcl_Obj of each argument. */ { Interp *iPtr = (Interp *) interp; CommandTrace *tracePtr, *lastTracePtr; ActiveCommandTrace active; int curLevel; int traceCode = TCL_OK; TraceCommandInfo* tcmdPtr; if (command == NULL || cmdPtr->tracePtr == NULL) { return traceCode; } curLevel = ((iPtr->varFramePtr == NULL) ? 0 : iPtr->varFramePtr->level); active.nextPtr = iPtr->activeCmdTracePtr; iPtr->activeCmdTracePtr = &active; active.cmdPtr = cmdPtr; lastTracePtr = NULL; for (tracePtr = cmdPtr->tracePtr; (traceCode == TCL_OK) && (tracePtr != NULL); tracePtr = active.nextTracePtr) { if (traceFlags & TCL_TRACE_LEAVE_EXEC) { /* execute the trace command in order of creation for "leave" */ active.nextTracePtr = NULL; tracePtr = cmdPtr->tracePtr; while (tracePtr->nextPtr != lastTracePtr) { active.nextTracePtr = tracePtr; tracePtr = tracePtr->nextPtr; } } else { active.nextTracePtr = tracePtr->nextPtr; } tcmdPtr = (TraceCommandInfo*)tracePtr->clientData; if (tcmdPtr->flags != 0) { tcmdPtr->curFlags = traceFlags | TCL_TRACE_EXEC_DIRECT; tcmdPtr->curCode = code; tcmdPtr->refCount++; traceCode = TraceExecutionProc((ClientData)tcmdPtr, interp, curLevel, command, (Tcl_Command)cmdPtr, objc, objv); if ((--tcmdPtr->refCount) <= 0) { ckfree((char*)tcmdPtr); } } lastTracePtr = tracePtr; } iPtr->activeCmdTracePtr = active.nextPtr; return(traceCode); } /* *---------------------------------------------------------------------- * * TclCheckInterpTraces -- * * Checks on all current traces, and invokes procedures which * have been registered. This procedure can be used by other * code which performs execution to unify the tracing system. * For instance extensions like [incr Tcl] which use their * own execution technique can make use of Tcl's tracing. * * This procedure is called by 'TclEvalObjvInternal' * * Results: * The return value is a standard Tcl completion code such as * TCL_OK or TCL_ERROR, etc. * * Side effects: * Those side effects made by any trace procedures called. * *---------------------------------------------------------------------- */ int TclCheckInterpTraces(interp, command, numChars, cmdPtr, code, traceFlags, objc, objv) Tcl_Interp *interp; /* The current interpreter. */ CONST char *command; /* Pointer to beginning of the current * command string. */ int numChars; /* The number of characters in 'command' * which are part of the command string. */ Command *cmdPtr; /* Points to command's Command struct. */ int code; /* The current result code. */ int traceFlags; /* Current tracing situation. */ int objc; /* Number of arguments for the command. */ Tcl_Obj *CONST objv[]; /* Pointers to Tcl_Obj of each argument. */ { Interp *iPtr = (Interp *) interp; Trace *tracePtr, *lastTracePtr; ActiveInterpTrace active; int curLevel; int traceCode = TCL_OK; TraceCommandInfo* tcmdPtr; if (command == NULL || iPtr->tracePtr == NULL || (iPtr->flags & INTERP_TRACE_IN_PROGRESS)) { return(traceCode); } curLevel = ((iPtr->varFramePtr == NULL) ? 0 : iPtr->varFramePtr->level); active.nextPtr = iPtr->activeInterpTracePtr; iPtr->activeInterpTracePtr = &active; lastTracePtr = NULL; for ( tracePtr = iPtr->tracePtr; (traceCode == TCL_OK) && (tracePtr != NULL); tracePtr = active.nextTracePtr) { if (traceFlags & TCL_TRACE_ENTER_EXEC) { /* * Execute the trace command in reverse order of creation * for "enterstep" operation. The order is changed for * "enterstep" instead of for "leavestep" as was done in * TclCheckExecutionTraces because for step traces, * Tcl_CreateObjTrace creates one more linked list of traces * which results in one more reversal of trace invocation. */ active.nextTracePtr = NULL; tracePtr = iPtr->tracePtr; while (tracePtr->nextPtr != lastTracePtr) { active.nextTracePtr = tracePtr; tracePtr = tracePtr->nextPtr; } } else { active.nextTracePtr = tracePtr->nextPtr; } if (tracePtr->level > 0 && curLevel > tracePtr->level) { continue; } if (!(tracePtr->flags & TCL_TRACE_EXEC_IN_PROGRESS)) { /* * The proc invoked might delete the traced command which * which might try to free tracePtr. We want to use tracePtr * until the end of this if section, so we use * Tcl_Preserve() and Tcl_Release() to be sure it is not * freed while we still need it. */ Tcl_Preserve((ClientData) tracePtr); tracePtr->flags |= TCL_TRACE_EXEC_IN_PROGRESS; if (tracePtr->flags & (TCL_TRACE_ENTER_EXEC | TCL_TRACE_LEAVE_EXEC)) { /* New style trace */ if ((tracePtr->flags != TCL_TRACE_EXEC_IN_PROGRESS) && ((tracePtr->flags & traceFlags) != 0)) { tcmdPtr = (TraceCommandInfo*)tracePtr->clientData; tcmdPtr->curFlags = traceFlags; tcmdPtr->curCode = code; traceCode = (tracePtr->proc)((ClientData)tcmdPtr, (Tcl_Interp*)interp, curLevel, command, (Tcl_Command)cmdPtr, objc, objv); } } else { /* Old-style trace */ if (traceFlags & TCL_TRACE_ENTER_EXEC) { /* * Old-style interpreter-wide traces only trigger * before the command is executed. */ traceCode = CallTraceProcedure(interp, tracePtr, cmdPtr, command, numChars, objc, objv); } } tracePtr->flags &= ~TCL_TRACE_EXEC_IN_PROGRESS; Tcl_Release((ClientData) tracePtr); } lastTracePtr = tracePtr; } iPtr->activeInterpTracePtr = active.nextPtr; return(traceCode); } /* *---------------------------------------------------------------------- * * CallTraceProcedure -- * * Invokes a trace procedure registered with an interpreter. These * procedures trace command execution. Currently this trace procedure * is called with the address of the string-based Tcl_CmdProc for the * command, not the Tcl_ObjCmdProc. * * Results: * None. * * Side effects: * Those side effects made by the trace procedure. * *---------------------------------------------------------------------- */ static int CallTraceProcedure(interp, tracePtr, cmdPtr, command, numChars, objc, objv) Tcl_Interp *interp; /* The current interpreter. */ register Trace *tracePtr; /* Describes the trace procedure to call. */ Command *cmdPtr; /* Points to command's Command struct. */ CONST char *command; /* Points to the first character of the * command's source before substitutions. */ int numChars; /* The number of characters in the * command's source. */ register int objc; /* Number of arguments for the command. */ Tcl_Obj *CONST objv[]; /* Pointers to Tcl_Obj of each argument. */ { Interp *iPtr = (Interp *) interp; char *commandCopy; int traceCode; /* * Copy the command characters into a new string. */ commandCopy = (char *) ckalloc((unsigned) (numChars + 1)); memcpy((VOID *) commandCopy, (VOID *) command, (size_t) numChars); commandCopy[numChars] = '\0'; /* * Call the trace procedure then free allocated storage. */ traceCode = (tracePtr->proc)( tracePtr->clientData, (Tcl_Interp*) iPtr, iPtr->numLevels, commandCopy, (Tcl_Command) cmdPtr, objc, objv ); ckfree((char *) commandCopy); return(traceCode); } /* *---------------------------------------------------------------------- * * CommandObjTraceDeleted -- * * Ensure the trace is correctly deleted by decrementing its * refCount and only deleting if no other references exist. * * Results: * None. * * Side effects: * May release memory. * *---------------------------------------------------------------------- */ static void CommandObjTraceDeleted(ClientData clientData) { TraceCommandInfo* tcmdPtr = (TraceCommandInfo*)clientData; if ((--tcmdPtr->refCount) <= 0) { ckfree((char*)tcmdPtr); } } /* *---------------------------------------------------------------------- * * TraceExecutionProc -- * * This procedure is invoked whenever code relevant to a * 'trace execution' command is executed. It is called in one * of two ways in Tcl's core: * * (i) by the TclCheckExecutionTraces, when an execution trace * has been triggered. * (ii) by TclCheckInterpTraces, when a prior execution trace has * created a trace of the internals of a procedure, passing in * this procedure as the one to be called. * * Results: * The return value is a standard Tcl completion code such as * TCL_OK or TCL_ERROR, etc. * * Side effects: * May invoke an arbitrary Tcl procedure, and may create or * delete an interpreter-wide trace. * *---------------------------------------------------------------------- */ static int TraceExecutionProc(ClientData clientData, Tcl_Interp *interp, int level, CONST char* command, Tcl_Command cmdInfo, int objc, struct Tcl_Obj *CONST objv[]) { int call = 0; Interp *iPtr = (Interp *) interp; TraceCommandInfo* tcmdPtr = (TraceCommandInfo*)clientData; int flags = tcmdPtr->curFlags; int code = tcmdPtr->curCode; int traceCode = TCL_OK; if (tcmdPtr->flags & TCL_TRACE_EXEC_IN_PROGRESS) { /* * Inside any kind of execution trace callback, we do * not allow any further execution trace callbacks to * be called for the same trace. */ return traceCode; } if (!(flags & TCL_INTERP_DESTROYED)) { /* * Check whether the current call is going to eval arbitrary * Tcl code with a generated trace, or whether we are only * going to setup interpreter-wide traces to implement the * 'step' traces. This latter situation can happen if * we create a command trace without either before or after * operations, but with either of the step operations. */ if (flags & TCL_TRACE_EXEC_DIRECT) { call = flags & tcmdPtr->flags & (TCL_TRACE_ENTER_EXEC | TCL_TRACE_LEAVE_EXEC); } else { call = 1; } /* * First, if we have returned back to the level at which we * created an interpreter trace for enterstep and/or leavestep * execution traces, we remove it here. */ if (flags & TCL_TRACE_LEAVE_EXEC) { if ((tcmdPtr->stepTrace != NULL) && (level == tcmdPtr->startLevel) && (strcmp(command, tcmdPtr->startCmd) == 0)) { Tcl_DeleteTrace(interp, tcmdPtr->stepTrace); tcmdPtr->stepTrace = NULL; if (tcmdPtr->startCmd != NULL) { ckfree((char *)tcmdPtr->startCmd); } } } /* * Second, create the tcl callback, if required. */ if (call) { Tcl_SavedResult state; Tcl_Obj *stateReturnOpts; Tcl_DString cmd; Tcl_DString sub; int i; Tcl_DStringInit(&cmd); Tcl_DStringAppend(&cmd, tcmdPtr->command, (int)tcmdPtr->length); /* Append command with arguments */ Tcl_DStringInit(&sub); for (i = 0; i < objc; i++) { char* str; int len; str = Tcl_GetStringFromObj(objv[i],&len); Tcl_DStringAppendElement(&sub, str); } Tcl_DStringAppendElement(&cmd, Tcl_DStringValue(&sub)); Tcl_DStringFree(&sub); if (flags & TCL_TRACE_ENTER_EXEC) { /* Append trace operation */ if (flags & TCL_TRACE_EXEC_DIRECT) { Tcl_DStringAppendElement(&cmd, "enter"); } else { Tcl_DStringAppendElement(&cmd, "enterstep"); } } else if (flags & TCL_TRACE_LEAVE_EXEC) { Tcl_Obj* resultCode; char* resultCodeStr; /* Append result code */ resultCode = Tcl_NewIntObj(code); resultCodeStr = Tcl_GetString(resultCode); Tcl_DStringAppendElement(&cmd, resultCodeStr); Tcl_DecrRefCount(resultCode); /* Append result string */ Tcl_DStringAppendElement(&cmd, Tcl_GetStringResult(interp)); /* Append trace operation */ if (flags & TCL_TRACE_EXEC_DIRECT) { Tcl_DStringAppendElement(&cmd, "leave"); } else { Tcl_DStringAppendElement(&cmd, "leavestep"); } } else { Tcl_Panic("TraceExecutionProc: bad flag combination"); } /* * Execute the command. Save the interp's result used for * the command, including the value of iPtr->returnOpts which * may be modified when Tcl_Eval is invoked. We discard any * object result the command returns. */ Tcl_SaveResult(interp, &state); stateReturnOpts = iPtr->returnOpts; Tcl_IncrRefCount(stateReturnOpts); tcmdPtr->flags |= TCL_TRACE_EXEC_IN_PROGRESS; iPtr->flags |= INTERP_TRACE_IN_PROGRESS; tcmdPtr->refCount++; /* * This line can have quite arbitrary side-effects, * including deleting the trace, the command being * traced, or even the interpreter. */ traceCode = Tcl_Eval(interp, Tcl_DStringValue(&cmd)); tcmdPtr->flags &= ~TCL_TRACE_EXEC_IN_PROGRESS; iPtr->flags &= ~INTERP_TRACE_IN_PROGRESS; if (tcmdPtr->flags == 0) { flags |= TCL_TRACE_DESTROYED; } if (traceCode == TCL_OK) { /* Restore result if trace execution was successful */ Tcl_RestoreResult(interp, &state); if (iPtr->returnOpts != stateReturnOpts) { Tcl_DecrRefCount(iPtr->returnOpts); iPtr->returnOpts = stateReturnOpts; Tcl_IncrRefCount(iPtr->returnOpts); } } else { Tcl_DiscardResult(&state); } Tcl_DecrRefCount(stateReturnOpts); Tcl_DStringFree(&cmd); } /* * Third, if there are any step execution traces for this proc, * we register an interpreter trace to invoke enterstep and/or * leavestep traces. * We also need to save the current stack level and the proc * string in startLevel and startCmd so that we can delete this * interpreter trace when it reaches the end of this proc. */ if ((flags & TCL_TRACE_ENTER_EXEC) && (tcmdPtr->stepTrace == NULL) && (tcmdPtr->flags & (TCL_TRACE_ENTER_DURING_EXEC | TCL_TRACE_LEAVE_DURING_EXEC))) { tcmdPtr->startLevel = level; tcmdPtr->startCmd = (char *) ckalloc((unsigned) (strlen(command) + 1)); strcpy(tcmdPtr->startCmd, command); tcmdPtr->refCount++; tcmdPtr->stepTrace = Tcl_CreateObjTrace(interp, 0, (tcmdPtr->flags & TCL_TRACE_ANY_EXEC) >> 2, TraceExecutionProc, (ClientData)tcmdPtr, CommandObjTraceDeleted); } } if (flags & TCL_TRACE_DESTROYED) { if (tcmdPtr->stepTrace != NULL) { Tcl_DeleteTrace(interp, tcmdPtr->stepTrace); tcmdPtr->stepTrace = NULL; if (tcmdPtr->startCmd != NULL) { ckfree((char *)tcmdPtr->startCmd); } } } if (call) { if ((--tcmdPtr->refCount) <= 0) { ckfree((char*)tcmdPtr); } } return traceCode; } /* *---------------------------------------------------------------------- * * TraceVarProc -- * * This procedure is called to handle variable accesses that have * been traced using the "trace" command. * * Results: * Normally returns NULL. If the trace command returns an error, * then this procedure returns an error string. * * Side effects: * Depends on the command associated with the trace. * *---------------------------------------------------------------------- */ /* ARGSUSED */ static char * TraceVarProc(clientData, interp, name1, name2, flags) ClientData clientData; /* Information about the variable trace. */ Tcl_Interp *interp; /* Interpreter containing variable. */ CONST char *name1; /* Name of variable or array. */ CONST char *name2; /* Name of element within array; NULL means * scalar variable is being referenced. */ int flags; /* OR-ed bits giving operation and other * information. */ { Tcl_SavedResult state; TraceVarInfo *tvarPtr = (TraceVarInfo *) clientData; char *result; int code; Tcl_DString cmd; /* * We might call Tcl_Eval() below, and that might evaluate * [trace vdelete] which might try to free tvarPtr. We want * to use tvarPtr until the end of this function, so we use * Tcl_Preserve() and Tcl_Release() to be sure it is not * freed while we still need it. */ Tcl_Preserve((ClientData) tvarPtr); result = NULL; if ((tvarPtr->flags & flags) && !(flags & TCL_INTERP_DESTROYED)) { if (tvarPtr->length != (size_t) 0) { /* * Generate a command to execute by appending list elements * for the two variable names and the operation. */ Tcl_DStringInit(&cmd); Tcl_DStringAppend(&cmd, tvarPtr->command, (int) tvarPtr->length); Tcl_DStringAppendElement(&cmd, name1); Tcl_DStringAppendElement(&cmd, (name2 ? name2 : "")); #ifndef TCL_REMOVE_OBSOLETE_TRACES if (tvarPtr->flags & TCL_TRACE_OLD_STYLE) { if (flags & TCL_TRACE_ARRAY) { Tcl_DStringAppend(&cmd, " a", 2); } else if (flags & TCL_TRACE_READS) { Tcl_DStringAppend(&cmd, " r", 2); } else if (flags & TCL_TRACE_WRITES) { Tcl_DStringAppend(&cmd, " w", 2); } else if (flags & TCL_TRACE_UNSETS) { Tcl_DStringAppend(&cmd, " u", 2); } } else { #endif if (flags & TCL_TRACE_ARRAY) { Tcl_DStringAppend(&cmd, " array", 6); } else if (flags & TCL_TRACE_READS) { Tcl_DStringAppend(&cmd, " read", 5); } else if (flags & TCL_TRACE_WRITES) { Tcl_DStringAppend(&cmd, " write", 6); } else if (flags & TCL_TRACE_UNSETS) { Tcl_DStringAppend(&cmd, " unset", 6); } #ifndef TCL_REMOVE_OBSOLETE_TRACES } #endif /* * Execute the command. Save the interp's result used for * the command. We discard any object result the command returns. * * Add the TCL_TRACE_DESTROYED flag to tvarPtr to indicate to * other areas that this will be destroyed by us, otherwise a * double-free might occur depending on what the eval does. */ Tcl_SaveResult(interp, &state); if (flags & TCL_TRACE_DESTROYED) { tvarPtr->flags |= TCL_TRACE_DESTROYED; } code = Tcl_EvalEx(interp, Tcl_DStringValue(&cmd), Tcl_DStringLength(&cmd), 0); if (code != TCL_OK) { /* copy error msg to result */ register Tcl_Obj *errMsgObj = Tcl_GetObjResult(interp); Tcl_IncrRefCount(errMsgObj); result = (char *) errMsgObj; } Tcl_RestoreResult(interp, &state); Tcl_DStringFree(&cmd); } } if (flags & TCL_TRACE_DESTROYED) { if (result != NULL) { register Tcl_Obj *errMsgObj = (Tcl_Obj *) result; Tcl_DecrRefCount(errMsgObj); result = NULL; } Tcl_EventuallyFree((ClientData) tvarPtr, TCL_DYNAMIC); } Tcl_Release((ClientData) tvarPtr); return result; } /* *---------------------------------------------------------------------- * * Tcl_CreateObjTrace -- * * Arrange for a procedure to be called to trace command execution. * * Results: * The return value is a token for the trace, which may be passed * to Tcl_DeleteTrace to eliminate the trace. * * Side effects: * From now on, proc will be called just before a command procedure * is called to execute a Tcl command. Calls to proc will have the * following form: * * void proc( ClientData clientData, * Tcl_Interp* interp, * int level, * CONST char* command, * Tcl_Command commandInfo, * int objc, * Tcl_Obj *CONST objv[] ); * * The 'clientData' and 'interp' arguments to 'proc' will be the * same as the arguments to Tcl_CreateObjTrace. The 'level' * argument gives the nesting depth of command interpretation within * the interpreter. The 'command' argument is the ASCII text of * the command being evaluated -- before any substitutions are * performed. The 'commandInfo' argument gives a handle to the * command procedure that will be evaluated. The 'objc' and 'objv' * parameters give the parameter vector that will be passed to the * command procedure. proc does not return a value. * * It is permissible for 'proc' to call Tcl_SetCommandTokenInfo * to change the command procedure or client data for the command * being evaluated, and these changes will take effect with the * current evaluation. * * The 'level' argument specifies the maximum nesting level of calls * to be traced. If the execution depth of the interpreter exceeds * 'level', the trace callback is not executed. * * The 'flags' argument is either zero or the value, * TCL_ALLOW_INLINE_COMPILATION. If the TCL_ALLOW_INLINE_COMPILATION * flag is not present, the bytecode compiler will not generate inline * code for Tcl's built-in commands. This behavior will have a significant * impact on performance, but will ensure that all command evaluations are * traced. If the TCL_ALLOW_INLINE_COMPILATION flag is present, the * bytecode compiler will have its normal behavior of compiling in-line * code for some of Tcl's built-in commands. In this case, the tracing * will be imprecise -- in-line code will not be traced -- but run-time * performance will be improved. The latter behavior is desired for * many applications such as profiling of run time. * * When the trace is deleted, the 'delProc' procedure will be invoked, * passing it the original client data. * *---------------------------------------------------------------------- */ Tcl_Trace Tcl_CreateObjTrace( interp, level, flags, proc, clientData, delProc ) Tcl_Interp* interp; /* Tcl interpreter */ int level; /* Maximum nesting level */ int flags; /* Flags, see above */ Tcl_CmdObjTraceProc* proc; /* Trace callback */ ClientData clientData; /* Client data for the callback */ Tcl_CmdObjTraceDeleteProc* delProc; /* Procedure to call when trace is deleted */ { register Trace *tracePtr; register Interp *iPtr = (Interp *) interp; /* Test if this trace allows inline compilation of commands */ if (!(flags & TCL_ALLOW_INLINE_COMPILATION)) { if (iPtr->tracesForbiddingInline == 0) { /* * When the first trace forbidding inline compilation is * created, invalidate existing compiled code for this * interpreter and arrange (by setting the * DONT_COMPILE_CMDS_INLINE flag) that when compiling new * code, no commands will be compiled inline (i.e., into * an inline sequence of instructions). We do this because * commands that were compiled inline will never result in * a command trace being called. */ iPtr->compileEpoch++; iPtr->flags |= DONT_COMPILE_CMDS_INLINE; } iPtr->tracesForbiddingInline++; } tracePtr = (Trace *) ckalloc(sizeof(Trace)); tracePtr->level = level; tracePtr->proc = proc; tracePtr->clientData = clientData; tracePtr->delProc = delProc; tracePtr->nextPtr = iPtr->tracePtr; tracePtr->flags = flags; iPtr->tracePtr = tracePtr; return (Tcl_Trace) tracePtr; } /* *---------------------------------------------------------------------- * * Tcl_CreateTrace -- * * Arrange for a procedure to be called to trace command execution. * * Results: * The return value is a token for the trace, which may be passed * to Tcl_DeleteTrace to eliminate the trace. * * Side effects: * From now on, proc will be called just before a command procedure * is called to execute a Tcl command. Calls to proc will have the * following form: * * void * proc(clientData, interp, level, command, cmdProc, cmdClientData, * argc, argv) * ClientData clientData; * Tcl_Interp *interp; * int level; * char *command; * int (*cmdProc)(); * ClientData cmdClientData; * int argc; * char **argv; * { * } * * The clientData and interp arguments to proc will be the same * as the corresponding arguments to this procedure. Level gives * the nesting level of command interpretation for this interpreter * (0 corresponds to top level). Command gives the ASCII text of * the raw command, cmdProc and cmdClientData give the procedure that * will be called to process the command and the ClientData value it * will receive, and argc and argv give the arguments to the * command, after any argument parsing and substitution. Proc * does not return a value. * *---------------------------------------------------------------------- */ Tcl_Trace Tcl_CreateTrace(interp, level, proc, clientData) Tcl_Interp *interp; /* Interpreter in which to create trace. */ int level; /* Only call proc for commands at nesting * level<=argument level (1=>top level). */ Tcl_CmdTraceProc *proc; /* Procedure to call before executing each * command. */ ClientData clientData; /* Arbitrary value word to pass to proc. */ { StringTraceData* data; data = (StringTraceData*) ckalloc( sizeof( *data )); data->clientData = clientData; data->proc = proc; return Tcl_CreateObjTrace( interp, level, 0, StringTraceProc, (ClientData) data, StringTraceDeleteProc ); } /* *---------------------------------------------------------------------- * * StringTraceProc -- * * Invoke a string-based trace procedure from an object-based * callback. * * Results: * None. * * Side effects: * Whatever the string-based trace procedure does. * *---------------------------------------------------------------------- */ static int StringTraceProc( clientData, interp, level, command, commandInfo, objc, objv ) ClientData clientData; Tcl_Interp* interp; int level; CONST char* command; Tcl_Command commandInfo; int objc; Tcl_Obj *CONST *objv; { StringTraceData* data = (StringTraceData*) clientData; Command* cmdPtr = (Command*) commandInfo; CONST char** argv; /* Args to pass to string trace proc */ int i; /* * This is a bit messy because we have to emulate the old trace * interface, which uses strings for everything. */ argv = (CONST char **) ckalloc((unsigned) ( (objc + 1) * sizeof(CONST char *) )); for (i = 0; i < objc; i++) { argv[i] = Tcl_GetString(objv[i]); } argv[objc] = 0; /* * Invoke the command procedure. Note that we cast away const-ness * on two parameters for compatibility with legacy code; the code * MUST NOT modify either command or argv. */ ( data->proc )( data->clientData, interp, level, (char*) command, cmdPtr->proc, cmdPtr->clientData, objc, argv ); ckfree( (char*) argv ); return TCL_OK; } /* *---------------------------------------------------------------------- * * StringTraceDeleteProc -- * * Clean up memory when a string-based trace is deleted. * * Results: * None. * * Side effects: * Allocated memory is returned to the system. * *---------------------------------------------------------------------- */ static void StringTraceDeleteProc( clientData ) ClientData clientData; { ckfree( (char*) clientData ); } /* *---------------------------------------------------------------------- * * Tcl_DeleteTrace -- * * Remove a trace. * * Results: * None. * * Side effects: * From now on there will be no more calls to the procedure given * in trace. * *---------------------------------------------------------------------- */ void Tcl_DeleteTrace(interp, trace) Tcl_Interp *interp; /* Interpreter that contains trace. */ Tcl_Trace trace; /* Token for trace (returned previously by * Tcl_CreateTrace). */ { Interp *iPtr = (Interp *) interp; Trace *tracePtr = (Trace *) trace; register Trace **tracePtr2 = &(iPtr->tracePtr); /* * Locate the trace entry in the interpreter's trace list, * and remove it from the list. */ while ((*tracePtr2) != NULL && (*tracePtr2) != tracePtr) { tracePtr2 = &((*tracePtr2)->nextPtr); } if (*tracePtr2 == NULL) { return; } (*tracePtr2) = (*tracePtr2)->nextPtr; /* * If the trace forbids bytecode compilation, change the interpreter's * state. If bytecode compilation is now permitted, flag the fact and * advance the compilation epoch so that procs will be recompiled to * take advantage of it. */ if (!(tracePtr->flags & TCL_ALLOW_INLINE_COMPILATION)) { iPtr->tracesForbiddingInline--; if (iPtr->tracesForbiddingInline == 0) { iPtr->flags &= ~DONT_COMPILE_CMDS_INLINE; iPtr->compileEpoch++; } } /* * Execute any delete callback. */ if (tracePtr->delProc != NULL) { (tracePtr->delProc)(tracePtr->clientData); } /* Delete the trace object */ Tcl_EventuallyFree((char*)tracePtr, TCL_DYNAMIC); } /* *---------------------------------------------------------------------- * * TclTraceVarExists -- * * This is called from info exists. We need to trigger read * and/or array traces because they may end up creating a * variable that doesn't currently exist. * * Results: * A pointer to the Var structure, or NULL. * * Side effects: * May fill in error messages in the interp. * *---------------------------------------------------------------------- */ Var * TclVarTraceExists(interp, varName) Tcl_Interp *interp; /* The interpreter */ CONST char *varName; /* The variable name */ { Var *varPtr; Var *arrayPtr; /* * The choice of "create" flag values is delicate here, and * matches the semantics of GetVar. Things are still not perfect, * however, because if you do "info exists x" you get a varPtr * and therefore trigger traces. However, if you do * "info exists x(i)", then you only get a varPtr if x is already * known to be an array. Otherwise you get NULL, and no trace * is triggered. This matches Tcl 7.6 semantics. */ varPtr = TclLookupVar(interp, varName, (char *) NULL, 0, "access", /*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return NULL; } if ((varPtr->tracePtr != NULL) || ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) { TclCallVarTraces((Interp *)interp, arrayPtr, varPtr, varName, NULL, TCL_TRACE_READS, /* leaveErrMsg */ 0); } /* * If the variable doesn't exist anymore and no-one's using * it, then free up the relevant structures and hash table entries. */ if (TclIsVarUndefined(varPtr)) { TclCleanupVar(varPtr, arrayPtr); return NULL; } return varPtr; } /* *---------------------------------------------------------------------- * * TclCallVarTraces -- * * This procedure is invoked to find and invoke relevant * trace procedures associated with a particular operation on * a variable. This procedure invokes traces both on the * variable and on its containing array (where relevant). * * Results: * Returns TCL_OK to indicate normal operation. Returns TCL_ERROR * if invocation of a trace procedure indicated an error. When * TCL_ERROR is returned and leaveErrMsg is true, then the * ::errorInfo variable of iPtr has information about the error * appended to it. * * Side effects: * Almost anything can happen, depending on trace; this procedure * itself doesn't have any side effects. * *---------------------------------------------------------------------- */ int TclCallVarTraces(iPtr, arrayPtr, varPtr, part1, part2, flags, leaveErrMsg) Interp *iPtr; /* Interpreter containing variable. */ register Var *arrayPtr; /* Pointer to array variable that contains * the variable, or NULL if the variable * isn't an element of an array. */ Var *varPtr; /* Variable whose traces are to be * invoked. */ CONST char *part1; CONST char *part2; /* Variable's two-part name. */ int flags; /* Flags passed to trace procedures: * indicates what's happening to variable, * plus other stuff like TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY, and * TCL_INTERP_DESTROYED. */ int leaveErrMsg; /* If true, and one of the traces indicates an * error, then leave an error message and stack * trace information in *iPTr. */ { register VarTrace *tracePtr; ActiveVarTrace active; char *result; CONST char *openParen, *p; Tcl_DString nameCopy; int copiedName; int code = TCL_OK; int disposeFlags = 0; /* * If there are already similar trace procedures active for the * variable, don't call them again. */ if (varPtr->flags & VAR_TRACE_ACTIVE) { return code; } varPtr->flags |= VAR_TRACE_ACTIVE; varPtr->refCount++; if (arrayPtr != NULL) { arrayPtr->refCount++; } /* * If the variable name hasn't been parsed into array name and * element, do it here. If there really is an array element, * make a copy of the original name so that NULLs can be * inserted into it to separate the names (can't modify the name * string in place, because the string might get used by the * callbacks we invoke). */ copiedName = 0; if (part2 == NULL) { for (p = part1; *p ; p++) { if (*p == '(') { openParen = p; do { p++; } while (*p != '\0'); p--; if (*p == ')') { int offset = (openParen - part1); char *newPart1; Tcl_DStringInit(&nameCopy); Tcl_DStringAppend(&nameCopy, part1, (p-part1)); newPart1 = Tcl_DStringValue(&nameCopy); newPart1[offset] = 0; part1 = newPart1; part2 = newPart1 + offset + 1; copiedName = 1; } break; } } } /* * Invoke traces on the array containing the variable, if relevant. */ result = NULL; active.nextPtr = iPtr->activeVarTracePtr; iPtr->activeVarTracePtr = &active; Tcl_Preserve((ClientData) iPtr); if (arrayPtr != NULL && !(arrayPtr->flags & VAR_TRACE_ACTIVE)) { active.varPtr = arrayPtr; for (tracePtr = arrayPtr->tracePtr; tracePtr != NULL; tracePtr = active.nextTracePtr) { active.nextTracePtr = tracePtr->nextPtr; if (!(tracePtr->flags & flags)) { continue; } Tcl_Preserve((ClientData) tracePtr); result = (*tracePtr->traceProc)(tracePtr->clientData, (Tcl_Interp *) iPtr, part1, part2, flags); if (result != NULL) { if (flags & TCL_TRACE_UNSETS) { /* Ignore errors in unset traces */ DisposeTraceResult(tracePtr->flags, result); } else { disposeFlags = tracePtr->flags; code = TCL_ERROR; } } Tcl_Release((ClientData) tracePtr); if (code == TCL_ERROR) { goto done; } } } /* * Invoke traces on the variable itself. */ if (flags & TCL_TRACE_UNSETS) { flags |= TCL_TRACE_DESTROYED; } active.varPtr = varPtr; for (tracePtr = varPtr->tracePtr; tracePtr != NULL; tracePtr = active.nextTracePtr) { active.nextTracePtr = tracePtr->nextPtr; if (!(tracePtr->flags & flags)) { continue; } Tcl_Preserve((ClientData) tracePtr); result = (*tracePtr->traceProc)(tracePtr->clientData, (Tcl_Interp *) iPtr, part1, part2, flags); if (result != NULL) { if (flags & TCL_TRACE_UNSETS) { /* Ignore errors in unset traces */ DisposeTraceResult(tracePtr->flags, result); } else { disposeFlags = tracePtr->flags; code = TCL_ERROR; } } Tcl_Release((ClientData) tracePtr); if (code == TCL_ERROR) { goto done; } } /* * Restore the variable's flags, remove the record of our active * traces, and then return. */ done: if (code == TCL_ERROR) { if (leaveErrMsg) { CONST char *type = ""; switch (flags&(TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_ARRAY)) { case TCL_TRACE_READS: { type = "read"; break; } case TCL_TRACE_WRITES: { type = "set"; break; } case TCL_TRACE_ARRAY: { type = "trace array"; break; } } if (disposeFlags & TCL_TRACE_RESULT_OBJECT) { TclVarErrMsg((Tcl_Interp *) iPtr, part1, part2, type, Tcl_GetString((Tcl_Obj *) result)); } else { TclVarErrMsg((Tcl_Interp *) iPtr, part1, part2, type, result); } } DisposeTraceResult(disposeFlags,result); } if (arrayPtr != NULL) { arrayPtr->refCount--; } if (copiedName) { Tcl_DStringFree(&nameCopy); } varPtr->flags &= ~VAR_TRACE_ACTIVE; varPtr->refCount--; iPtr->activeVarTracePtr = active.nextPtr; Tcl_Release((ClientData) iPtr); return code; } /* *---------------------------------------------------------------------- * * DisposeTraceResult-- * * This procedure is called to dispose of the result returned from * a trace procedure. The disposal method appropriate to the type * of result is determined by flags. * * Results: * None. * * Side effects: * The memory allocated for the trace result may be freed. * *---------------------------------------------------------------------- */ static void DisposeTraceResult(flags, result) int flags; /* Indicates type of result to determine * proper disposal method */ char *result; /* The result returned from a trace * procedure to be disposed */ { if (flags & TCL_TRACE_RESULT_DYNAMIC) { ckfree(result); } else if (flags & TCL_TRACE_RESULT_OBJECT) { Tcl_DecrRefCount((Tcl_Obj *) result); } } /* *---------------------------------------------------------------------- * * Tcl_UntraceVar -- * * Remove a previously-created trace for a variable. * * Results: * None. * * Side effects: * If there exists a trace for the variable given by varName * with the given flags, proc, and clientData, then that trace * is removed. * *---------------------------------------------------------------------- */ void Tcl_UntraceVar(interp, varName, flags, proc, clientData) Tcl_Interp *interp; /* Interpreter containing variable. */ CONST char *varName; /* Name of variable; may end with "(index)" * to signify an array reference. */ int flags; /* OR-ed collection of bits describing * current trace, including any of * TCL_TRACE_READS, TCL_TRACE_WRITES, * TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY * and TCL_NAMESPACE_ONLY. */ Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */ ClientData clientData; /* Arbitrary argument to pass to proc. */ { Tcl_UntraceVar2(interp, varName, (char *) NULL, flags, proc, clientData); } /* *---------------------------------------------------------------------- * * Tcl_UntraceVar2 -- * * Remove a previously-created trace for a variable. * * Results: * None. * * Side effects: * If there exists a trace for the variable given by part1 * and part2 with the given flags, proc, and clientData, then * that trace is removed. * *---------------------------------------------------------------------- */ void Tcl_UntraceVar2(interp, part1, part2, flags, proc, clientData) Tcl_Interp *interp; /* Interpreter containing variable. */ CONST char *part1; /* Name of variable or array. */ CONST char *part2; /* Name of element within array; NULL means * trace applies to scalar variable or array * as-a-whole. */ int flags; /* OR-ed collection of bits describing * current trace, including any of * TCL_TRACE_READS, TCL_TRACE_WRITES, * TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY, * and TCL_NAMESPACE_ONLY. */ Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */ ClientData clientData; /* Arbitrary argument to pass to proc. */ { register VarTrace *tracePtr; VarTrace *prevPtr; Var *varPtr, *arrayPtr; Interp *iPtr = (Interp *) interp; ActiveVarTrace *activePtr; int flagMask; /* * Set up a mask to mask out the parts of the flags that we are not * interested in now. */ flagMask = TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY; varPtr = TclLookupVar(interp, part1, part2, flags & flagMask, /*msg*/ (char *) NULL, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); if (varPtr == NULL) { return; } /* * Set up a mask to mask out the parts of the flags that we are not * interested in now. */ flagMask = TCL_TRACE_READS | TCL_TRACE_WRITES | TCL_TRACE_UNSETS | TCL_TRACE_ARRAY | TCL_TRACE_RESULT_DYNAMIC | TCL_TRACE_RESULT_OBJECT; #ifndef TCL_REMOVE_OBSOLETE_TRACES flagMask |= TCL_TRACE_OLD_STYLE; #endif flags &= flagMask; for (tracePtr = varPtr->tracePtr, prevPtr = NULL; ; prevPtr = tracePtr, tracePtr = tracePtr->nextPtr) { if (tracePtr == NULL) { return; } if ((tracePtr->traceProc == proc) && (tracePtr->flags == flags) && (tracePtr->clientData == clientData)) { break; } } /* * The code below makes it possible to delete traces while traces * are active: it makes sure that the deleted trace won't be * processed by TclCallVarTraces. */ for (activePtr = iPtr->activeVarTracePtr; activePtr != NULL; activePtr = activePtr->nextPtr) { if (activePtr->nextTracePtr == tracePtr) { activePtr->nextTracePtr = tracePtr->nextPtr; } } if (prevPtr == NULL) { varPtr->tracePtr = tracePtr->nextPtr; } else { prevPtr->nextPtr = tracePtr->nextPtr; } Tcl_EventuallyFree((ClientData) tracePtr, TCL_DYNAMIC); /* * If this is the last trace on the variable, and the variable is * unset and unused, then free up the variable. */ if (TclIsVarUndefined(varPtr)) { TclCleanupVar(varPtr, (Var *) NULL); } } /* *---------------------------------------------------------------------- * * Tcl_VarTraceInfo -- * * Return the clientData value associated with a trace on a * variable. This procedure can also be used to step through * all of the traces on a particular variable that have the * same trace procedure. * * Results: * The return value is the clientData value associated with * a trace on the given variable. Information will only be * returned for a trace with proc as trace procedure. If * the clientData argument is NULL then the first such trace is * returned; otherwise, the next relevant one after the one * given by clientData will be returned. If the variable * doesn't exist, or if there are no (more) traces for it, * then NULL is returned. * * Side effects: * None. * *---------------------------------------------------------------------- */ ClientData Tcl_VarTraceInfo(interp, varName, flags, proc, prevClientData) Tcl_Interp *interp; /* Interpreter containing variable. */ CONST char *varName; /* Name of variable; may end with "(index)" * to signify an array reference. */ int flags; /* OR-ed combo or TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY (can be 0). */ Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */ ClientData prevClientData; /* If non-NULL, gives last value returned * by this procedure, so this call will * return the next trace after that one. * If NULL, this call will return the * first trace. */ { return Tcl_VarTraceInfo2(interp, varName, (char *) NULL, flags, proc, prevClientData); } /* *---------------------------------------------------------------------- * * Tcl_VarTraceInfo2 -- * * Same as Tcl_VarTraceInfo, except takes name in two pieces * instead of one. * * Results: * Same as Tcl_VarTraceInfo. * * Side effects: * None. * *---------------------------------------------------------------------- */ ClientData Tcl_VarTraceInfo2(interp, part1, part2, flags, proc, prevClientData) Tcl_Interp *interp; /* Interpreter containing variable. */ CONST char *part1; /* Name of variable or array. */ CONST char *part2; /* Name of element within array; NULL means * trace applies to scalar variable or array * as-a-whole. */ int flags; /* OR-ed combination of TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY. */ Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */ ClientData prevClientData; /* If non-NULL, gives last value returned * by this procedure, so this call will * return the next trace after that one. * If NULL, this call will return the * first trace. */ { register VarTrace *tracePtr; Var *varPtr, *arrayPtr; varPtr = TclLookupVar(interp, part1, part2, flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY), /*msg*/ (char *) NULL, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); if (varPtr == NULL) { return NULL; } /* * Find the relevant trace, if any, and return its clientData. */ tracePtr = varPtr->tracePtr; if (prevClientData != NULL) { for ( ; tracePtr != NULL; tracePtr = tracePtr->nextPtr) { if ((tracePtr->clientData == prevClientData) && (tracePtr->traceProc == proc)) { tracePtr = tracePtr->nextPtr; break; } } } for ( ; tracePtr != NULL; tracePtr = tracePtr->nextPtr) { if (tracePtr->traceProc == proc) { return tracePtr->clientData; } } return NULL; } /* *---------------------------------------------------------------------- * * Tcl_TraceVar -- * * Arrange for reads and/or writes to a variable to cause a * procedure to be invoked, which can monitor the operations * and/or change their actions. * * Results: * A standard Tcl return value. * * Side effects: * A trace is set up on the variable given by varName, such that * future references to the variable will be intermediated by * proc. See the manual entry for complete details on the calling * sequence for proc. * *---------------------------------------------------------------------- */ int Tcl_TraceVar(interp, varName, flags, proc, clientData) Tcl_Interp *interp; /* Interpreter in which variable is * to be traced. */ CONST char *varName; /* Name of variable; may end with "(index)" * to signify an array reference. */ int flags; /* OR-ed collection of bits, including any * of TCL_TRACE_READS, TCL_TRACE_WRITES, * TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY, and * TCL_NAMESPACE_ONLY. */ Tcl_VarTraceProc *proc; /* Procedure to call when specified ops are * invoked upon varName. */ ClientData clientData; /* Arbitrary argument to pass to proc. */ { return Tcl_TraceVar2(interp, varName, (char *) NULL, flags, proc, clientData); } /* *---------------------------------------------------------------------- * * Tcl_TraceVar2 -- * * Arrange for reads and/or writes to a variable to cause a * procedure to be invoked, which can monitor the operations * and/or change their actions. * * Results: * A standard Tcl return value. * * Side effects: * A trace is set up on the variable given by part1 and part2, such * that future references to the variable will be intermediated by * proc. See the manual entry for complete details on the calling * sequence for proc. * *---------------------------------------------------------------------- */ int Tcl_TraceVar2(interp, part1, part2, flags, proc, clientData) Tcl_Interp *interp; /* Interpreter in which variable is * to be traced. */ CONST char *part1; /* Name of scalar variable or array. */ CONST char *part2; /* Name of element within array; NULL means * trace applies to scalar variable or array * as-a-whole. */ int flags; /* OR-ed collection of bits, including any * of TCL_TRACE_READS, TCL_TRACE_WRITES, * TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY, * and TCL_NAMESPACE_ONLY. */ Tcl_VarTraceProc *proc; /* Procedure to call when specified ops are * invoked upon varName. */ ClientData clientData; /* Arbitrary argument to pass to proc. */ { Var *varPtr, *arrayPtr; register VarTrace *tracePtr; int flagMask; /* * We strip 'flags' down to just the parts which are relevant to * TclLookupVar, to avoid conflicts between trace flags and * internal namespace flags such as 'FIND_ONLY_NS'. This can * now occur since we have trace flags with values 0x1000 and higher. */ flagMask = TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY; varPtr = TclLookupVar(interp, part1, part2, (flags & flagMask) | TCL_LEAVE_ERR_MSG, "trace", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } /* * Check for a nonsense flag combination. Note that this is a * Tcl_Panic() because there should be no code path that ever sets * both flags. */ if ((flags&TCL_TRACE_RESULT_DYNAMIC) && (flags&TCL_TRACE_RESULT_OBJECT)) { Tcl_Panic("bad result flag combination"); } /* * Set up trace information. */ flagMask = TCL_TRACE_READS | TCL_TRACE_WRITES | TCL_TRACE_UNSETS | TCL_TRACE_ARRAY | TCL_TRACE_RESULT_DYNAMIC | TCL_TRACE_RESULT_OBJECT; #ifndef TCL_REMOVE_OBSOLETE_TRACES flagMask |= TCL_TRACE_OLD_STYLE; #endif tracePtr = (VarTrace *) ckalloc(sizeof(VarTrace)); tracePtr->traceProc = proc; tracePtr->clientData = clientData; tracePtr->flags = flags & flagMask; tracePtr->nextPtr = varPtr->tracePtr; varPtr->tracePtr = tracePtr; return TCL_OK; }