tclVar.c Go to the documentation of this file. /* * tclVar.c -- * * This file contains routines that implement Tcl variables (both scalars * and arrays). * * The implementation of arrays is modelled after an initial * implementation by Mark Diekhans and Karl Lehenbauer. * * Copyright (c) 1987-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright (c) 1998-1999 by Scriptics Corporation. * Copyright (c) 2001 by Kevin B. Kenny. All rights reserved. * Copyright (c) 2007 Miguel Sofer * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tclVar.c,v 1.159 2007/12/13 15:23:21 dgp Exp $ */ #include "tclInt.h" /* * Prototypes for the variable hash key methods. */ static Tcl_HashEntry * AllocVarEntry(Tcl_HashTable *tablePtr, void *keyPtr); static void FreeVarEntry(Tcl_HashEntry *hPtr); static int CompareVarKeys(void *keyPtr, Tcl_HashEntry *hPtr); static unsigned int HashVarKey(Tcl_HashTable *tablePtr, void *keyPtr); static Tcl_HashKeyType tclVarHashKeyType = { TCL_HASH_KEY_TYPE_VERSION, /* version */ 0, /* flags */ HashVarKey, /* hashKeyProc */ CompareVarKeys, /* compareKeysProc */ AllocVarEntry, /* allocEntryProc */ FreeVarEntry /* freeEntryProc */ }; static inline Var * VarHashCreateVar(TclVarHashTable *tablePtr, Tcl_Obj *key, int *newPtr); static inline Var * VarHashFirstVar(TclVarHashTable *tablePtr, Tcl_HashSearch *searchPtr); static inline Var * VarHashNextVar(Tcl_HashSearch *searchPtr); static inline void CleanupVar(Var *varPtr, Var *arrayPtr); #define VarHashGetValue(hPtr) \ ((Var *) ((char *)hPtr - TclOffset(VarInHash, entry))) static inline Var * VarHashCreateVar( TclVarHashTable *tablePtr, Tcl_Obj *key, int *newPtr) { Tcl_HashEntry *hPtr = Tcl_CreateHashEntry((Tcl_HashTable *) tablePtr, (char *) key, newPtr); if (hPtr) { return VarHashGetValue(hPtr); } else { return NULL; } } #define VarHashFindVar(tablePtr, key) \ VarHashCreateVar((tablePtr), (key), NULL) #define VarHashInvalidateEntry(varPtr) \ ((varPtr)->flags |= VAR_DEAD_HASH) #define VarHashDeleteEntry(varPtr) \ Tcl_DeleteHashEntry(&(((VarInHash *) varPtr)->entry)) #define VarHashFirstEntry(tablePtr, searchPtr) \ Tcl_FirstHashEntry((Tcl_HashTable *) (tablePtr), (searchPtr)) #define VarHashNextEntry(searchPtr) \ Tcl_NextHashEntry((searchPtr)) static inline Var * VarHashFirstVar( TclVarHashTable *tablePtr, Tcl_HashSearch *searchPtr) { Tcl_HashEntry *hPtr = VarHashFirstEntry(tablePtr, searchPtr); if (hPtr) { return VarHashGetValue(hPtr); } else { return NULL; } } static inline Var * VarHashNextVar( Tcl_HashSearch *searchPtr) { Tcl_HashEntry *hPtr = VarHashNextEntry(searchPtr); if (hPtr) { return VarHashGetValue(hPtr); } else { return NULL; } } #define VarHashGetKey(varPtr) \ (((VarInHash *)(varPtr))->entry.key.objPtr) #define VarHashDeleteTable(tablePtr) \ Tcl_DeleteHashTable((Tcl_HashTable *) (tablePtr)) /* * The strings below are used to indicate what went wrong when a variable * access is denied. */ static const char *noSuchVar = "no such variable"; static const char *isArray = "variable is array"; static const char *needArray = "variable isn't array"; static const char *noSuchElement = "no such element in array"; static const char *danglingElement = "upvar refers to element in deleted array"; static const char *danglingVar = "upvar refers to variable in deleted namespace"; static const char *badNamespace = "parent namespace doesn't exist"; static const char *missingName = "missing variable name"; static const char *isArrayElement = "name refers to an element in an array"; /* * A test to see if we are in a call frame that has local variables. This is * true if we are inside a procedure body. */ #define HasLocalVars(framePtr) ((framePtr)->isProcCallFrame & FRAME_IS_PROC) /* * Forward references to functions defined later in this file: */ static void AppendLocals(Tcl_Interp *interp, Tcl_Obj *listPtr, Tcl_Obj *patternPtr, int includeLinks); static void DeleteSearches(Interp *iPtr, Var *arrayVarPtr); static void DeleteArray(Interp *iPtr, Tcl_Obj *arrayNamePtr, Var *varPtr, int flags); static Tcl_Var ObjFindNamespaceVar(Tcl_Interp *interp, Tcl_Obj *namePtr, Tcl_Namespace *contextNsPtr, int flags); static int ObjMakeUpvar(Tcl_Interp *interp, CallFrame *framePtr, Tcl_Obj *otherP1Ptr, const char *otherP2, const int otherFlags, Tcl_Obj *myNamePtr, int myFlags, int index); static ArraySearch * ParseSearchId(Tcl_Interp *interp, const Var *varPtr, Tcl_Obj *varNamePtr, Tcl_Obj *handleObj); static void UnsetVarStruct(Var *varPtr, Var *arrayPtr, Interp *iPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, int flags); static int SetArraySearchObj(Tcl_Interp *interp, Tcl_Obj *objPtr); /* * Functions defined in this file that may be exported in the future for use * by the bytecode compiler and engine or to the public interface. */ MODULE_SCOPE Var * TclLookupSimpleVar(Tcl_Interp *interp, Tcl_Obj *varNamePtr, int flags, const int create, const char **errMsgPtr, int *indexPtr); static Tcl_DupInternalRepProc DupLocalVarName; static Tcl_FreeInternalRepProc FreeLocalVarName; static Tcl_UpdateStringProc PanicOnUpdateVarName; static Tcl_FreeInternalRepProc FreeParsedVarName; static Tcl_DupInternalRepProc DupParsedVarName; static Tcl_UpdateStringProc UpdateParsedVarName; static Tcl_UpdateStringProc PanicOnUpdateVarName; static Tcl_SetFromAnyProc PanicOnSetVarName; /* * Types of Tcl_Objs used to cache variable lookups. * * localVarName - INTERNALREP DEFINITION: * ptrAndLongRep.ptr: pointer to name obj in varFramePtr->localCache * or NULL if it is this same obj * ptrAndLongRep.value: index into locals table * * nsVarName - INTERNALREP DEFINITION: * twoPtrValue.ptr1: pointer to the namespace containing the reference * twoPtrValue.ptr2: pointer to the corresponding Var * * parsedVarName - INTERNALREP DEFINITION: * twoPtrValue.ptr1: pointer to the array name Tcl_Obj, or NULL if it is a * scalar variable * twoPtrValue.ptr2: pointer to the element name string (owned by this * Tcl_Obj), or NULL if it is a scalar variable */ static Tcl_ObjType localVarNameType = { "localVarName", FreeLocalVarName, DupLocalVarName, PanicOnUpdateVarName, PanicOnSetVarName }; /* * Caching of namespace variables disabled: no simple way was found to avoid * interfering with the resolver's idea of variable existence. A cached * varName may keep a variable's name in the namespace's hash table, which is * the resolver's criterion for existence (see test namespace-17.10). */ #define ENABLE_NS_VARNAME_CACHING 0 #if ENABLE_NS_VARNAME_CACHING static Tcl_FreeInternalRepProc FreeNsVarName; static Tcl_DupInternalRepProc DupNsVarName; static Tcl_ObjType tclNsVarNameType = { "namespaceVarName", FreeNsVarName, DupNsVarName, PanicOnUpdateVarName, PanicOnSetVarName }; #endif static Tcl_ObjType tclParsedVarNameType = { "parsedVarName", FreeParsedVarName, DupParsedVarName, UpdateParsedVarName, PanicOnSetVarName }; /* * Type of Tcl_Objs used to speed up array searches. * * INTERNALREP DEFINITION: * twoPtrValue.ptr1: searchIdNumber (cast to pointer) * twoPtrValue.ptr2: variableNameStartInString (cast to pointer) * * Note that the value stored in ptr2 is the offset into the string of the * start of the variable name and not the address of the variable name itself, * as this can be safely copied. */ Tcl_ObjType tclArraySearchType = { "array search", NULL, NULL, NULL, SetArraySearchObj };  Var * TclVarHashCreateVar( TclVarHashTable *tablePtr, const char *key, int *newPtr) { Tcl_Obj *keyPtr; Var *varPtr; keyPtr = Tcl_NewStringObj(key, -1); Tcl_IncrRefCount(keyPtr); varPtr = VarHashCreateVar(tablePtr, keyPtr, newPtr); Tcl_DecrRefCount(keyPtr); return varPtr; }  /* *---------------------------------------------------------------------- * * TclCleanupVar -- * * This function is called when it looks like it may be OK to free up a * variable's storage. If the variable is in a hashtable, its Var * structure and hash table entry will be freed along with those of its * containing array, if any. This function is called, for example, when * a trace on a variable deletes a variable. * * Results: * None. * * Side effects: * If the variable (or its containing array) really is dead and in a * hashtable, then its Var structure, and possibly its hash table entry, * is freed up. * *---------------------------------------------------------------------- */ static inline void CleanupVar( Var *varPtr, /* Pointer to variable that may be a candidate * for being expunged. */ Var *arrayPtr) /* Array that contains the variable, or NULL * if this variable isn't an array element. */ { if (TclIsVarUndefined(varPtr) && TclIsVarInHash(varPtr) && !TclIsVarTraced(varPtr) && (VarHashRefCount(varPtr) == !TclIsVarDeadHash(varPtr))) { if (VarHashRefCount(varPtr) == 0) { ckfree((char *) varPtr); } else { VarHashDeleteEntry(varPtr); } } if (arrayPtr != NULL && TclIsVarUndefined(arrayPtr) && TclIsVarInHash(arrayPtr) && !TclIsVarTraced(arrayPtr) && (VarHashRefCount(arrayPtr) == !TclIsVarDeadHash(arrayPtr))) { if (VarHashRefCount(arrayPtr) == 0) { ckfree((char *) arrayPtr); } else { VarHashDeleteEntry(arrayPtr); } } } void TclCleanupVar( Var *varPtr, /* Pointer to variable that may be a candidate * for being expunged. */ Var *arrayPtr) /* Array that contains the variable, or NULL * if this variable isn't an array element. */ { CleanupVar(varPtr, arrayPtr); }  /* *---------------------------------------------------------------------- * * TclLookupVar -- * * This function is used to locate a variable given its name(s). It has * been mostly superseded by TclObjLookupVar, it is now only used by the * trace code. It is kept in tcl8.5 mainly because it is in the internal * stubs table, so that some extension may be calling it. * * Results: * The return value is a pointer to the variable structure indicated by * part1 and part2, or NULL if the variable couldn't be found. If the * variable is found, *arrayPtrPtr is filled in with the address of the * variable structure for the array that contains the variable (or NULL * if the variable is a scalar). If the variable can't be found and * either createPart1 or createPart2 are 1, a new as-yet-undefined * (VAR_UNDEFINED) variable structure is created, entered into a hash * table, and returned. * * If the variable isn't found and creation wasn't specified, or some * other error occurs, NULL is returned and an error message is left in * the interp's result if TCL_LEAVE_ERR_MSG is set in flags. * * Note: it's possible for the variable returned to be VAR_UNDEFINED even * if createPart1 or createPart2 are 1 (these only cause the hash table * entry or array to be created). For example, the variable might be a * global that has been unset but is still referenced by a procedure, or * a variable that has been unset but it only being kept in existence (if * VAR_UNDEFINED) by a trace. * * Side effects: * New hashtable entries may be created if createPart1 or createPart2 * are 1. * *---------------------------------------------------------------------- */ Var * TclLookupVar( Tcl_Interp *interp, /* Interpreter to use for lookup. */ const char *part1, /* If part2 isn't NULL, this is the name of an * array. Otherwise, this is a full variable * name that could include a parenthesized * array element. */ const char *part2, /* Name of element within array, or NULL. */ int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * and TCL_LEAVE_ERR_MSG bits matter. */ const char *msg, /* Verb to use in error messages, e.g. "read" * or "set". Only needed if TCL_LEAVE_ERR_MSG * is set in flags. */ int createPart1, /* If 1, create hash table entry for part 1 of * name, if it doesn't already exist. If 0, * return error if it doesn't exist. */ int createPart2, /* If 1, create hash table entry for part 2 of * name, if it doesn't already exist. If 0, * return error if it doesn't exist. */ Var **arrayPtrPtr) /* If the name refers to an element of an * array, *arrayPtrPtr gets filled in with * address of array variable. Otherwise this * is set to NULL. */ { Tcl_Obj *part1Ptr; Var *varPtr; part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); varPtr = TclObjLookupVar(interp, part1Ptr, part2, flags, msg, createPart1, createPart2, arrayPtrPtr); TclDecrRefCount(part1Ptr); return varPtr; }  /* *---------------------------------------------------------------------- * * TclObjLookupVar, TclObjLookupVarEx -- * * This function is used by virtually all of the variable code to locate * a variable given its name(s). The parsing into array/element * components and (if possible) the lookup results are cached in * part1Ptr, which is converted to one of the varNameTypes. * * Results: * The return value is a pointer to the variable structure indicated by * part1Ptr and part2, or NULL if the variable couldn't be found. If * * the variable is found, *arrayPtrPtr is filled with the address of the * variable structure for the array that contains the variable (or NULL * if the variable is a scalar). If the variable can't be found and * either createPart1 or createPart2 are 1, a new as-yet-undefined * (VAR_UNDEFINED) variable structure is created, entered into a hash * table, and returned. * * If the variable isn't found and creation wasn't specified, or some * other error occurs, NULL is returned and an error message is left in * the interp's result if TCL_LEAVE_ERR_MSG is set in flags. * * Note: it's possible for the variable returned to be VAR_UNDEFINED even * if createPart1 or createPart2 are 1 (these only cause the hash table * entry or array to be created). For example, the variable might be a * global that has been unset but is still referenced by a procedure, or * a variable that has been unset but it only being kept in existence (if * VAR_UNDEFINED) by a trace. * * Side effects: * New hashtable entries may be created if createPart1 or createPart2 * are 1. The object part1Ptr is converted to one of localVarNameType, * tclNsVarNameType or tclParsedVarNameType and caches as much of the * lookup as it can. * *---------------------------------------------------------------------- */ Var * TclObjLookupVar( Tcl_Interp *interp, /* Interpreter to use for lookup. */ register Tcl_Obj *part1Ptr, /* If part2 isn't NULL, this is the name of an * array. Otherwise, this is a full variable * name that could include a parenthesized * array element. */ const char *part2, /* Name of element within array, or NULL. */ int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * and TCL_LEAVE_ERR_MSG bits matter. */ const char *msg, /* Verb to use in error messages, e.g. "read" * or "set". Only needed if TCL_LEAVE_ERR_MSG * is set in flags. */ const int createPart1, /* If 1, create hash table entry for part 1 of * name, if it doesn't already exist. If 0, * return error if it doesn't exist. */ const int createPart2, /* If 1, create hash table entry for part 2 of * name, if it doesn't already exist. If 0, * return error if it doesn't exist. */ Var **arrayPtrPtr) /* If the name refers to an element of an * array, *arrayPtrPtr gets filled in with * address of array variable. Otherwise this * is set to NULL. */ { Tcl_Obj *part2Ptr; Var *resPtr; if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } else { part2Ptr = NULL; } resPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, msg, createPart1, createPart2, arrayPtrPtr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } return resPtr; } Var * TclObjLookupVarEx( Tcl_Interp *interp, /* Interpreter to use for lookup. */ Tcl_Obj *part1Ptr, /* If part2Ptr isn't NULL, this is the name of * an array. Otherwise, this is a full * variable name that could include a * parenthesized array element. */ Tcl_Obj *part2Ptr, /* Name of element within array, or NULL. */ int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * and TCL_LEAVE_ERR_MSG bits matter. */ const char *msg, /* Verb to use in error messages, e.g. "read" * or "set". Only needed if TCL_LEAVE_ERR_MSG * is set in flags. */ const int createPart1, /* If 1, create hash table entry for part 1 of * name, if it doesn't already exist. If 0, * return error if it doesn't exist. */ const int createPart2, /* If 1, create hash table entry for part 2 of * name, if it doesn't already exist. If 0, * return error if it doesn't exist. */ Var **arrayPtrPtr) /* If the name refers to an element of an * array, *arrayPtrPtr gets filled in with * address of array variable. Otherwise this * is set to NULL. */ { Interp *iPtr = (Interp *) interp; register Var *varPtr; /* Points to the variable's in-frame Var * structure. */ char *part1; int index, len1, len2; int parsed = 0; Tcl_Obj *objPtr; const Tcl_ObjType *typePtr = part1Ptr->typePtr; const char *errMsg = NULL; CallFrame *varFramePtr = iPtr->varFramePtr; Namespace *nsPtr; char *part2 = part2Ptr? TclGetString(part2Ptr):NULL; char *newPart2 = NULL; *arrayPtrPtr = NULL; if (varFramePtr) { nsPtr = varFramePtr->nsPtr; } else { /* * Some variables in the global ns have to be initialized before the * root call frame is in place. */ nsPtr = NULL; } if (typePtr == &localVarNameType) { int localIndex; localVarNameTypeHandling: localIndex = (int) part1Ptr->internalRep.ptrAndLongRep.value; if (HasLocalVars(varFramePtr) && !(flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)) && (localIndex < varFramePtr->numCompiledLocals)) { /* * Use the cached index if the names coincide. */ Tcl_Obj *namePtr = (Tcl_Obj *) part1Ptr->internalRep.ptrAndLongRep.ptr; Tcl_Obj *checkNamePtr = localName(iPtr->varFramePtr, localIndex); if ((!namePtr && (checkNamePtr == part1Ptr)) || (namePtr && (checkNamePtr == namePtr))) { varPtr = (Var *) &(varFramePtr->compiledLocals[localIndex]); goto donePart1; } } goto doneParsing; #if ENABLE_NS_VARNAME_CACHING } else if (typePtr == &tclNsVarNameType) { int useGlobal, useReference; Namespace *cachedNsPtr = part1Ptr->internalRep.twoPtrValue.ptr1; varPtr = part1Ptr->internalRep.twoPtrValue.ptr2; useGlobal = (cachedNsPtr == iPtr->globalNsPtr) && ( (flags & TCL_GLOBAL_ONLY) || (part1[0]==':' && part1[1]==':') || (!HasLocalVars(varFramePtr) && (nsPtr==iPtr->globalNsPtr))); useReference = useGlobal || ((cachedNsPtr == nsPtr) && ( (flags & TCL_NAMESPACE_ONLY) || (!HasLocalVars(varFramePtr) && !(flags & TCL_GLOBAL_ONLY) && /* * Careful: an undefined ns variable could be hiding a valid * global reference. */ !TclIsVarUndefined(varPtr)))); if (useReference && !TclIsVarDeadHash(varPtr)) { /* * A straight global or namespace reference, use it. It isn't so * simple to deal with 'implicit' namespace references, i.e., * those where the reference could be to either a namespace or a * global variable. Those we lookup again. * * If TclIsVarDeadHash(varPtr), this might be a reference to a * variable in a deleted namespace, kept alive by e.g. part1Ptr. * We could conceivably be so unlucky that a new namespace was * created at the same address as the deleted one, so to be safe * we test for a valid hPtr. */ goto donePart1; } goto doneParsing; #endif } /* * If part1Ptr is a tclParsedVarNameType, separate it into the pre-parsed * parts. */ if (typePtr == &tclParsedVarNameType) { if (part1Ptr->internalRep.twoPtrValue.ptr1 != NULL) { if (part2Ptr != NULL) { /* * ERROR: part1Ptr is already an array element, cannot specify * a part2. */ if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg, noSuchVar, -1); } return NULL; } part2 = newPart2 = part1Ptr->internalRep.twoPtrValue.ptr2; if (newPart2) { part2Ptr = Tcl_NewStringObj(newPart2, -1); Tcl_IncrRefCount(part2Ptr); } part1Ptr = part1Ptr->internalRep.twoPtrValue.ptr1; typePtr = part1Ptr->typePtr; if (typePtr == &localVarNameType) { goto localVarNameTypeHandling; } } parsed = 1; } part1 = TclGetStringFromObj(part1Ptr, &len1); if (!parsed && (*(part1 + len1 - 1) == ')')) { /* * part1Ptr is possibly an unparsed array element. */ register int i; len2 = -1; for (i = 0; i < len1; i++) { if (*(part1 + i) == '(') { if (part2Ptr != NULL) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg, needArray, -1); } return NULL; } /* * part1Ptr points to an array element; first copy the element * name to a new string part2. */ part2 = part1 + i + 1; len2 = len1 - i - 2; len1 = i; newPart2 = ckalloc((unsigned int) (len2+1)); memcpy(newPart2, part2, (unsigned int) len2); *(newPart2+len2) = '\0'; part2 = newPart2; part2Ptr = Tcl_NewStringObj(newPart2, -1); Tcl_IncrRefCount(part2Ptr); /* * Free the internal rep of the original part1Ptr, now renamed * objPtr, and set it to tclParsedVarNameType. */ objPtr = part1Ptr; TclFreeIntRep(objPtr); objPtr->typePtr = &tclParsedVarNameType; /* * Define a new string object to hold the new part1Ptr, i.e., * the array name. Set the internal rep of objPtr, reset * typePtr and part1 to contain the references to the array * name. */ TclNewStringObj(part1Ptr, part1, len1); Tcl_IncrRefCount(part1Ptr); objPtr->internalRep.twoPtrValue.ptr1 = part1Ptr; objPtr->internalRep.twoPtrValue.ptr2 = (void *) part2; typePtr = part1Ptr->typePtr; part1 = TclGetString(part1Ptr); break; } } } doneParsing: /* * part1Ptr is not an array element; look it up, and convert it to one of * the cached types if possible. */ TclFreeIntRep(part1Ptr); part1Ptr->typePtr = NULL; varPtr = TclLookupSimpleVar(interp, part1Ptr, flags, createPart1, &errMsg, &index); if (varPtr == NULL) { if ((errMsg != NULL) && (flags & TCL_LEAVE_ERR_MSG)) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg, errMsg, -1); } if (newPart2) { Tcl_DecrRefCount(part2Ptr); } return NULL; } /* * Cache the newly found variable if possible. */ if (index >= 0) { /* * An indexed local variable. */ part1Ptr->typePtr = &localVarNameType; if (part1Ptr != localName(iPtr->varFramePtr, index)) { part1Ptr->internalRep.ptrAndLongRep.ptr = localName(iPtr->varFramePtr, index); Tcl_IncrRefCount((Tcl_Obj *) part1Ptr->internalRep.ptrAndLongRep.ptr); } else { part1Ptr->internalRep.ptrAndLongRep.ptr = NULL; } part1Ptr->internalRep.ptrAndLongRep.value = (long) index; #if ENABLE_NS_VARNAME_CACHING } else if (index > -3) { /* * A cacheable namespace or global variable. */ Namespace *nsPtr; nsPtr = ((index == -1) ? iPtr->globalNsPtr : varFramePtr->nsPtr); varPtr->refCount++; part1Ptr->typePtr = &tclNsVarNameType; part1Ptr->internalRep.twoPtrValue.ptr1 = nsPtr; part1Ptr->internalRep.twoPtrValue.ptr2 = varPtr; #endif } else { /* * At least mark part1Ptr as already parsed. */ part1Ptr->typePtr = &tclParsedVarNameType; part1Ptr->internalRep.twoPtrValue.ptr1 = NULL; part1Ptr->internalRep.twoPtrValue.ptr2 = NULL; } donePart1: #if 0 if (varPtr == NULL) { if (flags & TCL_LEAVE_ERR_MSG) { part1 = TclGetString(part1Ptr); TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg, "Cached variable reference is NULL.", -1); } return NULL; } #endif while (TclIsVarLink(varPtr)) { varPtr = varPtr->value.linkPtr; } if (part2Ptr != NULL) { /* * Array element sought: look it up. */ *arrayPtrPtr = varPtr; varPtr = TclLookupArrayElement(interp, part1Ptr, part2Ptr, flags, msg, createPart1, createPart2, varPtr, -1); if (newPart2) { Tcl_DecrRefCount(part2Ptr); } } return varPtr; }  /* * This flag bit should not interfere with TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY, or TCL_LEAVE_ERR_MSG; it signals that the variable * lookup is performed for upvar (or similar) purposes, with slightly * different rules: * - Bug #696893 - variable is either proc-local or in the current * namespace; never follow the second (global) resolution path * - Bug #631741 - do not use special namespace or interp resolvers * * It should also not collide with the (deprecated) TCL_PARSE_PART1 flag * (Bug #835020) */ #define AVOID_RESOLVERS 0x40000 /* *---------------------------------------------------------------------- * * TclLookupSimpleVar -- * * This function is used by to locate a simple variable (i.e., not an * array element) given its name. * * Results: * The return value is a pointer to the variable structure indicated by * varName, or NULL if the variable couldn't be found. If the variable * can't be found and create is 1, a new as-yet-undefined (VAR_UNDEFINED) * variable structure is created, entered into a hash table, and * returned. * * If the current CallFrame corresponds to a proc and the variable found * is one of the compiledLocals, its index is placed in *indexPtr. * Otherwise, *indexPtr will be set to (according to the needs of * TclObjLookupVar): * -1 a global reference * -2 a reference to a namespace variable * -3 a non-cachable reference, i.e., one of: * . non-indexed local var * . a reference of unknown origin; * . resolution by a namespace or interp resolver * * If the variable isn't found and creation wasn't specified, or some * other error occurs, NULL is returned and the corresponding error * message is left in *errMsgPtr. * * Note: it's possible for the variable returned to be VAR_UNDEFINED even * if create is 1 (this only causes the hash table entry to be created). * For example, the variable might be a global that has been unset but is * still referenced by a procedure, or a variable that has been unset but * it only being kept in existence (if VAR_UNDEFINED) by a trace. * * Side effects: * A new hashtable entry may be created if create is 1. * *---------------------------------------------------------------------- */ Var * TclLookupSimpleVar( Tcl_Interp *interp, /* Interpreter to use for lookup. */ Tcl_Obj *varNamePtr, /* This is a simple variable name that could * represent a scalar or an array. */ int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * AVOID_RESOLVERS and TCL_LEAVE_ERR_MSG bits * matter. */ const int create, /* If 1, create hash table entry for varname, * if it doesn't already exist. If 0, return * error if it doesn't exist. */ const char **errMsgPtr, int *indexPtr) { Interp *iPtr = (Interp *) interp; CallFrame *varFramePtr = iPtr->varFramePtr; /* Points to the procedure call frame whose * variables are currently in use. Same as the * current procedure's frame, if any, unless * an "uplevel" is executing. */ TclVarHashTable *tablePtr; /* Points to the hashtable, if any, in which * to look up the variable. */ Tcl_Var var; /* Used to search for global names. */ Var *varPtr; /* Points to the Var structure returned for * the variable. */ Namespace *varNsPtr, *cxtNsPtr, *dummy1Ptr, *dummy2Ptr; ResolverScheme *resPtr; int isNew, i, result; const char *varName = TclGetString(varNamePtr); varPtr = NULL; varNsPtr = NULL; /* Set non-NULL if a nonlocal variable. */ *indexPtr = -3; if (flags & TCL_GLOBAL_ONLY) { cxtNsPtr = iPtr->globalNsPtr; } else { cxtNsPtr = iPtr->varFramePtr->nsPtr; } /* * If this namespace has a variable resolver, then give it first crack at * the variable resolution. It may return a Tcl_Var value, it may signal * to continue onward, or it may signal an error. */ if ((cxtNsPtr->varResProc != NULL || iPtr->resolverPtr != NULL) && !(flags & AVOID_RESOLVERS)) { resPtr = iPtr->resolverPtr; if (cxtNsPtr->varResProc) { result = (*cxtNsPtr->varResProc)(interp, varName, (Tcl_Namespace *) cxtNsPtr, flags, &var); } else { result = TCL_CONTINUE; } while (result == TCL_CONTINUE && resPtr) { if (resPtr->varResProc) { result = (*resPtr->varResProc)(interp, varName, (Tcl_Namespace *) cxtNsPtr, flags, &var); } resPtr = resPtr->nextPtr; } if (result == TCL_OK) { return (Var *) var; } else if (result != TCL_CONTINUE) { return NULL; } } /* * Look up varName. Look it up as either a namespace variable or as a * local variable in a procedure call frame (varFramePtr). Interpret * varName as a namespace variable if: * 1) so requested by a TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY flag, * 2) there is no active frame (we're at the global :: scope), * 3) the active frame was pushed to define the namespace context for a * "namespace eval" or "namespace inscope" command, * 4) the name has namespace qualifiers ("::"s). * Otherwise, if varName is a local variable, search first in the frame's * array of compiler-allocated local variables, then in its hashtable for * runtime-created local variables. * * If create and the variable isn't found, create the variable and, if * necessary, create varFramePtr's local var hashtable. */ if (((flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)) != 0) || !HasLocalVars(varFramePtr) || (strstr(varName, "::") != NULL)) { const char *tail; int lookGlobal = (flags & TCL_GLOBAL_ONLY) || (cxtNsPtr == iPtr->globalNsPtr) || ((*varName == ':') && (*(varName+1) == ':')); if (lookGlobal) { *indexPtr = -1; flags = (flags | TCL_GLOBAL_ONLY) & ~TCL_NAMESPACE_ONLY; } else { if (flags & AVOID_RESOLVERS) { flags = (flags | TCL_NAMESPACE_ONLY); } if (flags & TCL_NAMESPACE_ONLY) { *indexPtr = -2; } } /* * Don't pass TCL_LEAVE_ERR_MSG, we may yet create the variable, or * otherwise generate our own error! */ varPtr = (Var *) ObjFindNamespaceVar(interp, varNamePtr, (Tcl_Namespace *) cxtNsPtr, (flags | AVOID_RESOLVERS) & ~TCL_LEAVE_ERR_MSG); if (varPtr == NULL) { Tcl_Obj *tailPtr; if (create) { /* Var wasn't found so create it. */ TclGetNamespaceForQualName(interp, varName, cxtNsPtr, flags, &varNsPtr, &dummy1Ptr, &dummy2Ptr, &tail); if (varNsPtr == NULL) { *errMsgPtr = badNamespace; return NULL; } else if (tail == NULL) { *errMsgPtr = missingName; return NULL; } if (tail != varName) { tailPtr = Tcl_NewStringObj(tail, -1); } else { tailPtr = varNamePtr; } varPtr = VarHashCreateVar(&varNsPtr->varTable, tailPtr, &isNew); if (lookGlobal) { /* * The variable was created starting from the global * namespace: a global reference is returned even if it * wasn't explicitly requested. */ *indexPtr = -1; } else { *indexPtr = -2; } } else { /* Var wasn't found and not to create it. */ *errMsgPtr = noSuchVar; return NULL; } } } else { /* Local var: look in frame varFramePtr. */ Proc *procPtr = varFramePtr->procPtr; int localCt = procPtr->numCompiledLocals; Tcl_Obj **objPtrPtr = &varFramePtr->localCachePtr->varName0; for (i=0 ; i<localCt ; i++, objPtrPtr++) { register Tcl_Obj *objPtr = *objPtrPtr; if (objPtr) { char *localName = TclGetString(objPtr); if ((varName[0] == localName[0]) && (strcmp(varName, localName) == 0)) { *indexPtr = i; return (Var *) &varFramePtr->compiledLocals[i]; } } } tablePtr = varFramePtr->varTablePtr; if (create) { if (tablePtr == NULL) { tablePtr = (TclVarHashTable *) ckalloc(sizeof(TclVarHashTable)); TclInitVarHashTable(tablePtr, NULL); varFramePtr->varTablePtr = tablePtr; } varPtr = VarHashCreateVar(tablePtr, varNamePtr, &isNew); } else { varPtr = NULL; if (tablePtr != NULL) { varPtr = VarHashFindVar(tablePtr, varNamePtr); } if (varPtr == NULL) { *errMsgPtr = noSuchVar; } } } return varPtr; }  /* *---------------------------------------------------------------------- * * TclLookupArrayElement -- * * This function is used to locate a variable which is in an array's * hashtable given a pointer to the array's Var structure and the * element's name. * * Results: * The return value is a pointer to the variable structure , or NULL if * the variable couldn't be found. * * If arrayPtr points to a variable that isn't an array and createPart1 * is 1, the corresponding variable will be converted to an array. * Otherwise, NULL is returned and an error message is left in the * interp's result if TCL_LEAVE_ERR_MSG is set in flags. * * If the variable is not found and createPart2 is 1, the variable is * created. Otherwise, NULL is returned and an error message is left in * the interp's result if TCL_LEAVE_ERR_MSG is set in flags. * * Note: it's possible for the variable returned to be VAR_UNDEFINED even * if createPart1 or createPart2 are 1 (these only cause the hash table * entry or array to be created). For example, the variable might be a * global that has been unset but is still referenced by a procedure, or * a variable that has been unset but it only being kept in existence (if * VAR_UNDEFINED) by a trace. * * Side effects: * The variable at arrayPtr may be converted to be an array if * createPart1 is 1. A new hashtable entry may be created if createPart2 * is 1. * *---------------------------------------------------------------------- */ Var * TclLookupArrayElement( Tcl_Interp *interp, /* Interpreter to use for lookup. */ Tcl_Obj *arrayNamePtr, /* This is the name of the array, or NULL if * index>= 0. */ Tcl_Obj *elNamePtr, /* Name of element within array. */ const int flags, /* Only TCL_LEAVE_ERR_MSG bit matters. */ const char *msg, /* Verb to use in error messages, e.g. "read" * or "set". Only needed if TCL_LEAVE_ERR_MSG * is set in flags. */ const int createArray, /* If 1, transform arrayName to be an array if * it isn't one yet and the transformation is * possible. If 0, return error if it isn't * already an array. */ const int createElem, /* If 1, create hash table entry for the * element, if it doesn't already exist. If 0, * return error if it doesn't exist. */ Var *arrayPtr, /* Pointer to the array's Var structure. */ int index) /* If >=0, the index of the local array. */ { int isNew; Var *varPtr; TclVarHashTable *tablePtr; Namespace *nsPtr; /* * We're dealing with an array element. Make sure the variable is an array * and look up the element (create the element if desired). */ if (TclIsVarUndefined(arrayPtr) && !TclIsVarArrayElement(arrayPtr)) { if (!createArray) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg, noSuchVar, index); } return NULL; } /* * Make sure we are not resurrecting a namespace variable from a * deleted namespace! */ if (TclIsVarDeadHash(arrayPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg, danglingVar, index); } return NULL; } TclSetVarArray(arrayPtr); tablePtr = (TclVarHashTable *) ckalloc(sizeof(TclVarHashTable)); arrayPtr->value.tablePtr = tablePtr; if (TclIsVarInHash(arrayPtr) && TclGetVarNsPtr(arrayPtr)) { nsPtr = TclGetVarNsPtr(arrayPtr); } else { nsPtr = NULL; } TclInitVarHashTable(arrayPtr->value.tablePtr, nsPtr); } else if (!TclIsVarArray(arrayPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg, needArray, index); } return NULL; } if (createElem) { varPtr = VarHashCreateVar(arrayPtr->value.tablePtr, elNamePtr, &isNew); if (isNew) { if (arrayPtr->flags & VAR_SEARCH_ACTIVE) { DeleteSearches((Interp *) interp, arrayPtr); } TclSetVarArrayElement(varPtr); } } else { varPtr = VarHashFindVar(arrayPtr->value.tablePtr, elNamePtr); if (varPtr == NULL) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg, noSuchElement, index); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ELEMENT", TclGetString(elNamePtr), NULL); } } } return varPtr; }  /* *---------------------------------------------------------------------- * * Tcl_GetVar -- * * Return the value of a Tcl variable as a string. * * Results: * The return value points to the current value of varName as a string. * If the variable is not defined or can't be read because of a clash in * array usage then a NULL pointer is returned and an error message is * left in the interp's result if the TCL_LEAVE_ERR_MSG flag is set. * Note: the return value is only valid up until the next change to the * variable; if you depend on the value lasting longer than that, then * make yourself a private copy. * * Side effects: * None. * *---------------------------------------------------------------------- */ const char * Tcl_GetVar( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ const char *varName, /* Name of a variable in interp. */ int flags) /* OR-ed combination of TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY or TCL_LEAVE_ERR_MSG * bits. */ { return Tcl_GetVar2(interp, varName, NULL, flags); }  /* *---------------------------------------------------------------------- * * Tcl_GetVar2 -- * * Return the value of a Tcl variable as a string, given a two-part name * consisting of array name and element within array. * * Results: * The return value points to the current value of the variable given by * part1 and part2 as a string. If the specified variable doesn't exist, * or if there is a clash in array usage, then NULL is returned and a * message will be left in the interp's result if the TCL_LEAVE_ERR_MSG * flag is set. Note: the return value is only valid up until the next * change to the variable; if you depend on the value lasting longer than * that, then make yourself a private copy. * * Side effects: * None. * *---------------------------------------------------------------------- */ const char * Tcl_GetVar2( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ const char *part1, /* Name of an array (if part2 is non-NULL) or * the name of a variable. */ const char *part2, /* If non-NULL, gives the name of an element * in the array part1. */ int flags) /* OR-ed combination of TCL_GLOBAL_ONLY, * TCL_NAMESPACE_ONLY and TCL_LEAVE_ERR_MSG * * bits. */ { Tcl_Obj *objPtr; objPtr = Tcl_GetVar2Ex(interp, part1, part2, flags); if (objPtr == NULL) { return NULL; } return TclGetString(objPtr); }  /* *---------------------------------------------------------------------- * * Tcl_GetVar2Ex -- * * Return the value of a Tcl variable as a Tcl object, given a two-part * name consisting of array name and element within array. * * Results: * The return value points to the current object value of the variable * given by part1Ptr and part2Ptr. If the specified variable doesn't * exist, or if there is a clash in array usage, then NULL is returned * and a message will be left in the interpreter's result if the * TCL_LEAVE_ERR_MSG flag is set. * * Side effects: * The ref count for the returned object is _not_ incremented to reflect * the returned reference; if you want to keep a reference to the object * you must increment its ref count yourself. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_GetVar2Ex( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ const char *part1, /* Name of an array (if part2 is non-NULL) or * the name of a variable. */ const char *part2, /* If non-NULL, gives the name of an element * in the array part1. */ int flags) /* OR-ed combination of TCL_GLOBAL_ONLY, and * TCL_LEAVE_ERR_MSG bits. */ { Tcl_Obj *part1Ptr, *part2Ptr, *resPtr; part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } else { part2Ptr = NULL; } resPtr = Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags); Tcl_DecrRefCount(part1Ptr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } return resPtr; }  /* *---------------------------------------------------------------------- * * Tcl_ObjGetVar2 -- * * Return the value of a Tcl variable as a Tcl object, given a two-part * name consisting of array name and element within array. * * Results: * The return value points to the current object value of the variable * given by part1Ptr and part2Ptr. If the specified variable doesn't * exist, or if there is a clash in array usage, then NULL is returned * and a message will be left in the interpreter's result if the * TCL_LEAVE_ERR_MSG flag is set. * * Side effects: * The ref count for the returned object is _not_ incremented to reflect * the returned reference; if you want to keep a reference to the object * you must increment its ref count yourself. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_ObjGetVar2( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ register Tcl_Obj *part1Ptr, /* Points to an object holding the name of an * array (if part2 is non-NULL) or the name of * a variable. */ register Tcl_Obj *part2Ptr, /* If non-null, points to an object holding * the name of an element in the array * part1Ptr. */ int flags) /* OR-ed combination of TCL_GLOBAL_ONLY and * TCL_LEAVE_ERR_MSG bits. */ { Var *varPtr, *arrayPtr; /* * Filter to pass through only the flags this interface supports. */ flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG); varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read", /*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return NULL; } return TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, flags, -1); }  /* *---------------------------------------------------------------------- * * TclPtrGetVar -- * * Return the value of a Tcl variable as a Tcl object, given the pointers * to the variable's (and possibly containing array's) VAR structure. * * Results: * The return value points to the current object value of the variable * given by varPtr. If the specified variable doesn't exist, or if there * is a clash in array usage, then NULL is returned and a message will be * left in the interpreter's result if the TCL_LEAVE_ERR_MSG flag is set. * * Side effects: * The ref count for the returned object is _not_ incremented to reflect * the returned reference; if you want to keep a reference to the object * you must increment its ref count yourself. * *---------------------------------------------------------------------- */ Tcl_Obj * TclPtrGetVar( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ register Var *varPtr, /* The variable to be read.*/ Var *arrayPtr, /* NULL for scalar variables, pointer to the * containing array otherwise. */ Tcl_Obj *part1Ptr, /* Name of an array (if part2 is non-NULL) or * the name of a variable. */ Tcl_Obj *part2Ptr, /* If non-NULL, gives the name of an element * in the array part1. */ const int flags, /* OR-ed combination of TCL_GLOBAL_ONLY, and * TCL_LEAVE_ERR_MSG bits. */ int index) /* Index into the local variable table of the * variable, or -1. Only used when part1Ptr is * NULL. */ { Interp *iPtr = (Interp *) interp; const char *msg; /* * Invoke any read traces that have been set for the variable. */ if ((varPtr->flags & VAR_TRACED_READ) || (arrayPtr && (arrayPtr->flags & VAR_TRACED_READ))) { if (TCL_ERROR == TclObjCallVarTraces(iPtr, arrayPtr, varPtr, part1Ptr, part2Ptr, (flags & (TCL_NAMESPACE_ONLY|TCL_GLOBAL_ONLY)) | TCL_TRACE_READS, (flags & TCL_LEAVE_ERR_MSG), index)) { goto errorReturn; } } /* * Return the element if it's an existing scalar variable. */ if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) { return varPtr->value.objPtr; } if (flags & TCL_LEAVE_ERR_MSG) { if (TclIsVarUndefined(varPtr) && arrayPtr && !TclIsVarUndefined(arrayPtr)) { msg = noSuchElement; } else if (TclIsVarArray(varPtr)) { msg = isArray; } else { msg = noSuchVar; } TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "read", msg, index); } /* * An error. If the variable doesn't exist anymore and no-one's using it, * then free up the relevant structures and hash table entries. */ errorReturn: if (TclIsVarUndefined(varPtr)) { TclCleanupVar(varPtr, arrayPtr); } return NULL; }  /* *---------------------------------------------------------------------- * * Tcl_SetObjCmd -- * * This function is invoked to process the "set" Tcl command. See the * user documentation for details on what it does. * * Results: * A standard Tcl result value. * * Side effects: * A variable's value may be changed. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_SetObjCmd( ClientData dummy, /* Not used. */ register Tcl_Interp *interp,/* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Tcl_Obj *varValueObj; if (objc == 2) { varValueObj = Tcl_ObjGetVar2(interp, objv[1], NULL,TCL_LEAVE_ERR_MSG); if (varValueObj == NULL) { return TCL_ERROR; } Tcl_SetObjResult(interp, varValueObj); return TCL_OK; } else if (objc == 3) { varValueObj = Tcl_ObjSetVar2(interp, objv[1], NULL, objv[2], TCL_LEAVE_ERR_MSG); if (varValueObj == NULL) { return TCL_ERROR; } Tcl_SetObjResult(interp, varValueObj); return TCL_OK; } else { Tcl_WrongNumArgs(interp, 1, objv, "varName ?newValue?"); return TCL_ERROR; } }  /* *---------------------------------------------------------------------- * * Tcl_SetVar -- * * Change the value of a variable. * * Results: * Returns a pointer to the malloc'ed string which is the character * representation of the variable's new value. The caller must not modify * this string. If the write operation was disallowed then NULL is * returned; if the TCL_LEAVE_ERR_MSG flag is set, then an explanatory * message will be left in the interp's result. Note that the returned * string may not be the same as newValue; this is because variable * traces may modify the variable's value. * * Side effects: * If varName is defined as a local or global variable in interp, its * value is changed to newValue. If varName isn't currently defined, then * a new global variable by that name is created. * *---------------------------------------------------------------------- */ const char * Tcl_SetVar( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ const char *varName, /* Name of a variable in interp. */ const char *newValue, /* New value for varName. */ int flags) /* Various flags that tell how to set value: * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_APPEND_VALUE, TCL_LIST_ELEMENT, * TCL_LEAVE_ERR_MSG. */ { return Tcl_SetVar2(interp, varName, NULL, newValue, flags); }  /* *---------------------------------------------------------------------- * * Tcl_SetVar2 -- * * Given a two-part variable name, which may refer either to a scalar * variable or an element of an array, change the value of the variable. * If the named scalar or array or element doesn't exist then create one. * * Results: * Returns a pointer to the malloc'ed string which is the character * representation of the variable's new value. The caller must not modify * this string. If the write operation was disallowed because an array * was expected but not found (or vice versa), then NULL is returned; if * the TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be * left in the interp's result. Note that the returned string may not be * the same as newValue; this is because variable traces may modify the * variable's value. * * Side effects: * The value of the given variable is set. If either the array or the * entry didn't exist then a new one is created. * *---------------------------------------------------------------------- */ const char * Tcl_SetVar2( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ const char *part1, /* If part2 is NULL, this is name of scalar * variable. Otherwise it is the name of an * array. */ const char *part2, /* Name of an element within an array, or * NULL. */ const char *newValue, /* New value for variable. */ int flags) /* Various flags that tell how to set value: * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_APPEND_VALUE, TCL_LIST_ELEMENT, or * TCL_LEAVE_ERR_MSG. */ { register Tcl_Obj *valuePtr; Tcl_Obj *varValuePtr; /* * Create an object holding the variable's new value and use Tcl_SetVar2Ex * to actually set the variable. */ valuePtr = Tcl_NewStringObj(newValue, -1); Tcl_IncrRefCount(valuePtr); varValuePtr = Tcl_SetVar2Ex(interp, part1, part2, valuePtr, flags); Tcl_DecrRefCount(valuePtr); if (varValuePtr == NULL) { return NULL; } return TclGetString(varValuePtr); }  /* *---------------------------------------------------------------------- * * Tcl_SetVar2Ex -- * * Given a two-part variable name, which may refer either to a scalar * variable or an element of an array, change the value of the variable * to a new Tcl object value. If the named scalar or array or element * doesn't exist then create one. * * Results: * Returns a pointer to the Tcl_Obj holding the new value of the * variable. If the write operation was disallowed because an array was * expected but not found (or vice versa), then NULL is returned; if the * TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be * left in the interpreter's result. Note that the returned object may * not be the same one referenced by newValuePtr; this is because * variable traces may modify the variable's value. * * Side effects: * The value of the given variable is set. If either the array or the * entry didn't exist then a new variable is created. * * The reference count is decremented for any old value of the variable * and incremented for its new value. If the new value for the variable * is not the same one referenced by newValuePtr (perhaps as a result of * a variable trace), then newValuePtr's ref count is left unchanged by * Tcl_SetVar2Ex. newValuePtr's ref count is also left unchanged if we * are appending it as a string value: that is, if "flags" includes * TCL_APPEND_VALUE but not TCL_LIST_ELEMENT. * * The reference count for the returned object is _not_ incremented: if * you want to keep a reference to the object you must increment its ref * count yourself. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_SetVar2Ex( Tcl_Interp *interp, /* Command interpreter in which variable is to * be found. */ const char *part1, /* Name of an array (if part2 is non-NULL) or * the name of a variable. */ const char *part2, /* If non-NULL, gives the name of an element * in the array part1. */ Tcl_Obj *newValuePtr, /* New value for variable. */ int flags) /* Various flags that tell how to set value: * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_APPEND_VALUE, TCL_LIST_ELEMENT or * TCL_LEAVE_ERR_MSG. */ { Tcl_Obj *part1Ptr, *part2Ptr, *resPtr; part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } else { part2Ptr = NULL; } resPtr = Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, newValuePtr, flags); Tcl_DecrRefCount(part1Ptr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } return resPtr; }  /* *---------------------------------------------------------------------- * * Tcl_ObjSetVar2 -- * * This function is the same as Tcl_SetVar2Ex above, except the variable * names are passed in Tcl object instead of strings. * * Results: * Returns a pointer to the Tcl_Obj holding the new value of the * variable. If the write operation was disallowed because an array was * expected but not found (or vice versa), then NULL is returned; if the * TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be * left in the interpreter's result. Note that the returned object may * not be the same one referenced by newValuePtr; this is because * variable traces may modify the variable's value. * * Side effects: * The value of the given variable is set. If either the array or the * entry didn't exist then a new variable is created. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_ObjSetVar2( Tcl_Interp *interp, /* Command interpreter in which variable is to * be found. */ register Tcl_Obj *part1Ptr, /* Points to an object holding the name of an * array (if part2 is non-NULL) or the name of * a variable. */ register Tcl_Obj *part2Ptr, /* If non-NULL, points to an object holding * the name of an element in the array * part1Ptr. */ Tcl_Obj *newValuePtr, /* New value for variable. */ int flags) /* Various flags that tell how to set value: * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_APPEND_VALUE, TCL_LIST_ELEMENT, or * TCL_LEAVE_ERR_MSG. */ { Var *varPtr, *arrayPtr; /* * Filter to pass through only the flags this interface supports. */ flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG |TCL_APPEND_VALUE|TCL_LIST_ELEMENT); varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { if (newValuePtr->refCount == 0) { Tcl_DecrRefCount(newValuePtr); } return NULL; } return TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, newValuePtr, flags, -1); }  /* *---------------------------------------------------------------------- * * TclPtrSetVar -- * * This function is the same as Tcl_SetVar2Ex above, except that it * requires pointers to the variable's Var structs in addition to the * variable names. * * Results: * Returns a pointer to the Tcl_Obj holding the new value of the * variable. If the write operation was disallowed because an array was * expected but not found (or vice versa), then NULL is returned; if the * TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be * left in the interpreter's result. Note that the returned object may * not be the same one referenced by newValuePtr; this is because * variable traces may modify the variable's value. * * Side effects: * The value of the given variable is set. If either the array or the * entry didn't exist then a new variable is created. * *---------------------------------------------------------------------- */ Tcl_Obj * TclPtrSetVar( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ register Var *varPtr, /* Reference to the variable to set. */ Var *arrayPtr, /* Reference to the array containing the * variable, or NULL if the variable is a * scalar. */ Tcl_Obj *part1Ptr, /* Name of an array (if part2 is non-NULL) or * the name of a variable. NULL if the 'index' * parameter is >= 0 */ Tcl_Obj *part2Ptr, /* If non-NULL, gives the name of an element * in the array part1. */ Tcl_Obj *newValuePtr, /* New value for variable. */ const int flags, /* OR-ed combination of TCL_GLOBAL_ONLY, and * TCL_LEAVE_ERR_MSG bits. */ int index) /* Index of local var where part1 is to be * found. */ { Interp *iPtr = (Interp *) interp; Tcl_Obj *oldValuePtr; Tcl_Obj *resultPtr = NULL; int result; /* * If the variable is in a hashtable and its hPtr field is NULL, then we * may have an upvar to an array element where the array was deleted or an * upvar to a namespace variable whose namespace was deleted. Generate an * error (allowing the variable to be reset would screw up our storage * allocation and is meaningless anyway). */ if (TclIsVarDeadHash(varPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { if (TclIsVarArrayElement(varPtr)) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set", danglingElement, index); } else { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set", danglingVar, index); } } goto earlyError; } /* * It's an error to try to set an array variable itself. */ if (TclIsVarArray(varPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set", isArray,index); } goto earlyError; } /* * Invoke any read traces that have been set for the variable if it is * requested; this is only done in the core by the INST_LAPPEND_* * instructions. */ if ((flags & TCL_TRACE_READS) && ((varPtr->flags & VAR_TRACED_READ) || (arrayPtr && (arrayPtr->flags & VAR_TRACED_READ)))) { if (TCL_ERROR == TclObjCallVarTraces(iPtr, arrayPtr, varPtr, part1Ptr, part2Ptr, TCL_TRACE_READS, (flags & TCL_LEAVE_ERR_MSG), index)) { goto earlyError; } } /* * Set the variable's new value. If appending, append the new value to the * variable, either as a list element or as a string. Also, if appending, * then if the variable's old value is unshared we can modify it directly, * otherwise we must create a new copy to modify: this is "copy on write". */ oldValuePtr = varPtr->value.objPtr; if (flags & TCL_LIST_ELEMENT && !(flags & TCL_APPEND_VALUE)) { varPtr->value.objPtr = NULL; } if (flags & (TCL_APPEND_VALUE|TCL_LIST_ELEMENT)) { #if 0 /* * Can't happen now! */ if (TclIsVarUndefined(varPtr) && (oldValuePtr != NULL)) { TclDecrRefCount(oldValuePtr); /* Discard old value. */ varPtr->value.objPtr = NULL; oldValuePtr = NULL; } #endif if (flags & TCL_LIST_ELEMENT) { /* Append list element. */ if (oldValuePtr == NULL) { TclNewObj(oldValuePtr); varPtr->value.objPtr = oldValuePtr; Tcl_IncrRefCount(oldValuePtr); /* Since var is referenced. */ } else if (Tcl_IsShared(oldValuePtr)) { varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr); TclDecrRefCount(oldValuePtr); oldValuePtr = varPtr->value.objPtr; Tcl_IncrRefCount(oldValuePtr); /* Since var is referenced. */ } result = Tcl_ListObjAppendElement(interp, oldValuePtr, newValuePtr); if (result != TCL_OK) { goto earlyError; } } else { /* Append string. */ /* * We append newValuePtr's bytes but don't change its ref count. */ if (oldValuePtr == NULL) { varPtr->value.objPtr = newValuePtr; Tcl_IncrRefCount(newValuePtr); } else { if (Tcl_IsShared(oldValuePtr)) { /* Append to copy. */ varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr); TclDecrRefCount(oldValuePtr); oldValuePtr = varPtr->value.objPtr; Tcl_IncrRefCount(oldValuePtr); /* Since var is ref */ } Tcl_AppendObjToObj(oldValuePtr, newValuePtr); } } } else if (newValuePtr != oldValuePtr) { /* * In this case we are replacing the value, so we don't need to do * more than swap the objects. */ varPtr->value.objPtr = newValuePtr; Tcl_IncrRefCount(newValuePtr); /* Var is another ref. */ if (oldValuePtr != NULL) { TclDecrRefCount(oldValuePtr); /* Discard old value. */ } } /* * Invoke any write traces for the variable. */ if ((varPtr->flags & VAR_TRACED_WRITE) || (arrayPtr && (arrayPtr->flags & VAR_TRACED_WRITE))) { if (TCL_ERROR == TclObjCallVarTraces(iPtr, arrayPtr, varPtr, part1Ptr, part2Ptr, (flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_WRITES, (flags & TCL_LEAVE_ERR_MSG), index)) { goto cleanup; } } /* * Return the variable's value unless the variable was changed in some * gross way by a trace (e.g. it was unset and then recreated as an * array). */ if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) { return varPtr->value.objPtr; } /* * A trace changed the value in some gross way. Return an empty string * object. */ resultPtr = iPtr->emptyObjPtr; /* * If the variable doesn't exist anymore and no-one's using it, then free * up the relevant structures and hash table entries. */ cleanup: if (TclIsVarUndefined(varPtr)) { TclCleanupVar(varPtr, arrayPtr); } return resultPtr; earlyError: if (newValuePtr->refCount == 0) { Tcl_DecrRefCount(newValuePtr); } goto cleanup; }  /* *---------------------------------------------------------------------- * * TclIncrObjVar2 -- * * Given a two-part variable name, which may refer either to a scalar * variable or an element of an array, increment the Tcl object value of * the variable by a specified Tcl_Obj increment value. * * Results: * Returns a pointer to the Tcl_Obj holding the new value of the * variable. If the specified variable doesn't exist, or there is a clash * in array usage, or an error occurs while executing variable traces, * then NULL is returned and a message will be left in the interpreter's * result. * * Side effects: * The value of the given variable is incremented by the specified * amount. If either the array or the entry didn't exist then a new * variable is created. The ref count for the returned object is _not_ * incremented to reflect the returned reference; if you want to keep a * reference to the object you must increment its ref count yourself. * *---------------------------------------------------------------------- */ Tcl_Obj * TclIncrObjVar2( Tcl_Interp *interp, /* Command interpreter in which variable is to * be found. */ Tcl_Obj *part1Ptr, /* Points to an object holding the name of an * array (if part2 is non-NULL) or the name of * a variable. */ Tcl_Obj *part2Ptr, /* If non-null, points to an object holding * the name of an element in the array * part1Ptr. */ Tcl_Obj *incrPtr, /* Amount to be added to variable. */ int flags) /* Various flags that tell how to incr value: * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_APPEND_VALUE, TCL_LIST_ELEMENT, * TCL_LEAVE_ERR_MSG. */ { Var *varPtr, *arrayPtr; varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read", 1, 1, &arrayPtr); if (varPtr == NULL) { Tcl_AddObjErrorInfo(interp, "\n (reading value of variable to increment)", -1); return NULL; } return TclPtrIncrObjVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, incrPtr, flags, -1); }  /* *---------------------------------------------------------------------- * * TclPtrIncrObjVar -- * * Given the pointers to a variable and possible containing array, * increment the Tcl object value of the variable by a Tcl_Obj increment. * * Results: * Returns a pointer to the Tcl_Obj holding the new value of the * variable. If the specified variable doesn't exist, or there is a clash * in array usage, or an error occurs while executing variable traces, * then NULL is returned and a message will be left in the interpreter's * result. * * Side effects: * The value of the given variable is incremented by the specified * amount. If either the array or the entry didn't exist then a new * variable is created. The ref count for the returned object is _not_ * incremented to reflect the returned reference; if you want to keep a * reference to the object you must increment its ref count yourself. * *---------------------------------------------------------------------- */ Tcl_Obj * TclPtrIncrObjVar( Tcl_Interp *interp, /* Command interpreter in which variable is to * be found. */ Var *varPtr, /* Reference to the variable to set. */ Var *arrayPtr, /* Reference to the array containing the * variable, or NULL if the variable is a * scalar. */ Tcl_Obj *part1Ptr, /* Points to an object holding the name of an * array (if part2 is non-NULL) or the name of * a variable. */ Tcl_Obj *part2Ptr, /* If non-null, points to an object holding * the name of an element in the array * part1Ptr. */ Tcl_Obj *incrPtr, /* Increment value. */ /* TODO: Which of these flag values really make sense? */ const int flags, /* Various flags that tell how to incr value: * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_APPEND_VALUE, TCL_LIST_ELEMENT, * TCL_LEAVE_ERR_MSG. */ int index) /* Index into the local variable table of the * variable, or -1. Only used when part1Ptr is * NULL. */ { register Tcl_Obj *varValuePtr, *newValuePtr = NULL; int duplicated, code; if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)++; } varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, flags, index); if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)--; } if (varValuePtr == NULL) { varValuePtr = Tcl_NewIntObj(0); } if (Tcl_IsShared(varValuePtr)) { duplicated = 1; varValuePtr = Tcl_DuplicateObj(varValuePtr); } else { duplicated = 0; } code = TclIncrObj(interp, varValuePtr, incrPtr); if (code == TCL_OK) { newValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, varValuePtr, flags, index); } else if (duplicated) { Tcl_DecrRefCount(varValuePtr); } return newValuePtr; }  /* *---------------------------------------------------------------------- * * Tcl_UnsetVar -- * * Delete a variable, so that it may not be accessed anymore. * * Results: * Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if * the variable can't be unset. In the event of an error, if the * TCL_LEAVE_ERR_MSG flag is set then an error message is left in the * interp's result. * * Side effects: * If varName is defined as a local or global variable in interp, it is * deleted. * *---------------------------------------------------------------------- */ int Tcl_UnsetVar( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ const char *varName, /* Name of a variable in interp. May be either * a scalar name or an array name or an * element in an array. */ int flags) /* OR-ed combination of any of * TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY or * TCL_LEAVE_ERR_MSG. */ { return Tcl_UnsetVar2(interp, varName, NULL, flags); }  /* *---------------------------------------------------------------------- * * Tcl_UnsetVar2 -- * * Delete a variable, given a 2-part name. * * Results: * Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if * the variable can't be unset. In the event of an error, if the * TCL_LEAVE_ERR_MSG flag is set then an error message is left in the * interp's result. * * Side effects: * If part1 and part2 indicate a local or global variable in interp, it * is deleted. If part1 is an array name and part2 is NULL, then the * whole array is deleted. * *---------------------------------------------------------------------- */ int Tcl_UnsetVar2( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ const char *part1, /* Name of variable or array. */ const char *part2, /* Name of element within array or NULL. */ int flags) /* OR-ed combination of any of * TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_LEAVE_ERR_MSG. */ { int result; Tcl_Obj *part1Ptr, *part2Ptr = NULL; part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } /* * Filter to pass through only the flags this interface supports. */ flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG); result = TclObjUnsetVar2(interp, part1Ptr, part2Ptr, flags); Tcl_DecrRefCount(part1Ptr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } return result; }  /* *---------------------------------------------------------------------- * * TclObjUnsetVar2 -- * * Delete a variable, given a 2-object name. * * Results: * Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if * the variable can't be unset. In the event of an error, if the * TCL_LEAVE_ERR_MSG flag is set then an error message is left in the * interp's result. * * Side effects: * If part1ptr and part2Ptr indicate a local or global variable in * interp, it is deleted. If part1Ptr is an array name and part2Ptr is * NULL, then the whole array is deleted. * *---------------------------------------------------------------------- */ int TclObjUnsetVar2( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ Tcl_Obj *part1Ptr, /* Name of variable or array. */ Tcl_Obj *part2Ptr, /* Name of element within array or NULL. */ int flags) /* OR-ed combination of any of * TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_LEAVE_ERR_MSG. */ { Var *varPtr; Interp *iPtr = (Interp *) interp; Var *arrayPtr; int result; varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "unset", /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } result = (TclIsVarUndefined(varPtr)? TCL_ERROR : TCL_OK); /* * Keep the variable alive until we're done with it. We used to * increase/decrease the refCount for each operation, making it hard to * find [Bug 735335] - caused by unsetting the variable whose value was * the variable's name. */ if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)++; } UnsetVarStruct(varPtr, arrayPtr, iPtr, part1Ptr, part2Ptr, flags); /* * It's an error to unset an undefined variable. */ if (result != TCL_OK) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "unset", ((arrayPtr == NULL) ? noSuchVar : noSuchElement), -1); } } #if ENABLE_NS_VARNAME_CACHING /* * Try to avoid keeping the Var struct allocated due to a tclNsVarNameType * keeping a reference. This removes some additional exteriorisations of * [Bug 736729], but may be a good thing independently of the bug. */ if (part1Ptr->typePtr == &tclNsVarNameType) { TclFreeIntRep(part1Ptr); part1Ptr->typePtr = NULL; } #endif /* * Finally, if the variable is truly not in use then free up its Var * structure and remove it from its hash table, if any. The ref count of * its value object, if any, was decremented above. */ if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)--; CleanupVar(varPtr, arrayPtr); } return result; }  /* *---------------------------------------------------------------------- * * UnsetVarStruct -- * * Unset and delete a variable. This does the internal work for * TclObjUnsetVar2 and TclDeleteNamespaceVars, which call here for each * variable to be unset and deleted. * * Results: * None. * * Side effects: * If the arguments indicate a local or global variable in iPtr, it is * unset and deleted. * *---------------------------------------------------------------------- */ static void UnsetVarStruct( Var *varPtr, Var *arrayPtr, Interp *iPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, int flags) { Var dummyVar; int traced = TclIsVarTraced(varPtr) || (arrayPtr && (arrayPtr->flags & VAR_TRACED_UNSET)); if (arrayPtr && (arrayPtr->flags & VAR_SEARCH_ACTIVE)) { DeleteSearches(iPtr, arrayPtr); } else if (varPtr->flags & VAR_SEARCH_ACTIVE) { DeleteSearches(iPtr, varPtr); } /* * The code below is tricky, because of the possibility that a trace * function might try to access a variable being deleted. To handle this * situation gracefully, do things in three steps: * 1. Copy the contents of the variable to a dummy variable structure, and * mark the original Var structure as undefined. * 2. Invoke traces and clean up the variable, using the dummy copy. * 3. If at the end of this the original variable is still undefined and * has no outstanding references, then delete it (but it could have * gotten recreated by a trace). */ dummyVar = *varPtr; dummyVar.flags &= ~VAR_ALL_HASH; TclSetVarUndefined(varPtr); /* * Call trace functions for the variable being deleted. Then delete its * traces. Be sure to abort any other traces for the variable that are * still pending. Special tricks: * 1. We need to increment varPtr's refCount around this: TclCallVarTraces * will use dummyVar so it won't increment varPtr's refCount itself. * 2. Turn off the VAR_TRACE_ACTIVE flag in dummyVar: we want to call * unset traces even if other traces are pending. */ if (traced) { VarTrace *tracePtr = NULL; Tcl_HashEntry *tPtr = NULL; if (TclIsVarTraced(&dummyVar)) { /* * Transfer any existing traces on var, IF there are unset traces. * Otherwise just delete them. */ int isNew; Tcl_HashEntry *tPtr = Tcl_FindHashEntry(&iPtr->varTraces, (char *) varPtr); tracePtr = Tcl_GetHashValue(tPtr); varPtr->flags &= ~VAR_ALL_TRACES; Tcl_DeleteHashEntry(tPtr); if (dummyVar.flags & VAR_TRACED_UNSET) { tPtr = Tcl_CreateHashEntry(&iPtr->varTraces, (char *) &dummyVar, &isNew); Tcl_SetHashValue(tPtr, tracePtr); } else { tPtr = NULL; } } if ((dummyVar.flags & VAR_TRACED_UNSET) || (arrayPtr && (arrayPtr->flags & VAR_TRACED_UNSET))) { dummyVar.flags &= ~VAR_TRACE_ACTIVE; TclObjCallVarTraces(iPtr, arrayPtr, (Var *) &dummyVar, part1Ptr, part2Ptr, (flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_UNSETS, /* leaveErrMsg */ 0, -1); if (tPtr) { Tcl_DeleteHashEntry(tPtr); } } if (tracePtr) { ActiveVarTrace *activePtr; while (tracePtr) { VarTrace *prevPtr = tracePtr; tracePtr = tracePtr->nextPtr; Tcl_EventuallyFree((ClientData) prevPtr, TCL_DYNAMIC); } for (activePtr = iPtr->activeVarTracePtr; activePtr != NULL; activePtr = activePtr->nextPtr) { if (activePtr->varPtr == varPtr) { activePtr->nextTracePtr = NULL; } } dummyVar.flags &= ~VAR_ALL_TRACES; } } if (TclIsVarScalar(&dummyVar) && (dummyVar.value.objPtr != NULL)) { /* * Decrement the ref count of the var's value. */ Tcl_Obj *objPtr = dummyVar.value.objPtr; TclDecrRefCount(objPtr); } else if (TclIsVarArray(&dummyVar)) { /* * If the variable is an array, delete all of its elements. This must * be done after calling and deleting the traces on the array, above * (that's the way traces are defined). If the array name is not * present and is required for a trace on some element, it will be * computed at DeleteArray. */ DeleteArray(iPtr, part1Ptr, (Var *) &dummyVar, (flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_UNSETS); } else if (TclIsVarLink(&dummyVar)) { /* * For global/upvar variables referenced in procedures, decrement the * reference count on the variable referred to, and free the * referenced variable if it's no longer needed. */ Var *linkPtr = dummyVar.value.linkPtr; if (TclIsVarInHash(linkPtr)) { VarHashRefCount(linkPtr)--; CleanupVar(linkPtr, NULL); } } /* * If the variable was a namespace variable, decrement its reference * count. */ TclClearVarNamespaceVar(varPtr); }  /* *---------------------------------------------------------------------- * * Tcl_UnsetObjCmd -- * * This object-based function is invoked to process the "unset" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl object result value. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_UnsetObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { register int i, flags = TCL_LEAVE_ERR_MSG; register char *name; if (objc == 1) { /* * Do nothing if no arguments supplied, so as to match command * documentation. */ return TCL_OK; } /* * Simple, restrictive argument parsing. The only options are -- and * -nocomplain (which must come first and be given exactly to be an * option). */ i = 1; name = TclGetString(objv[i]); if (name[0] == '-') { if (strcmp("-nocomplain", name) == 0) { i++; if (i == objc) { return TCL_OK; } flags = 0; name = TclGetString(objv[i]); } if (strcmp("--", name) == 0) { i++; } } for (; i < objc; i++) { if ((TclObjUnsetVar2(interp, objv[i], NULL, flags) != TCL_OK) && (flags == TCL_LEAVE_ERR_MSG)) { return TCL_ERROR; } } return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_AppendObjCmd -- * * This object-based function is invoked to process the "append" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl object result value. * * Side effects: * A variable's value may be changed. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_AppendObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Var *varPtr, *arrayPtr; register Tcl_Obj *varValuePtr = NULL; /* Initialized to avoid compiler warning. */ int i; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?"); return TCL_ERROR; } if (objc == 2) { varValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL,TCL_LEAVE_ERR_MSG); if (varValuePtr == NULL) { return TCL_ERROR; } } else { varPtr = TclObjLookupVarEx(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG, "set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } for (i=2 ; i<objc ; i++) { /* * Note that we do not need to increase the refCount of the Var * pointers: should a trace delete the variable, the return value * of TclPtrSetVar will be NULL, and we will not access the * variable again. */ varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1], NULL, objv[i], TCL_APPEND_VALUE|TCL_LEAVE_ERR_MSG, -1); if (varValuePtr == NULL) { return TCL_ERROR; } } } Tcl_SetObjResult(interp, varValuePtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_LappendObjCmd -- * * This object-based function is invoked to process the "lappend" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl object result value. * * Side effects: * A variable's value may be changed. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_LappendObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Tcl_Obj *varValuePtr, *newValuePtr; int numElems, createdNewObj; Var *varPtr, *arrayPtr; int result; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?"); return TCL_ERROR; } if (objc == 2) { newValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL, 0); if (newValuePtr == NULL) { /* * The variable doesn't exist yet. Just create it with an empty * initial value. */ TclNewObj(varValuePtr); newValuePtr = Tcl_ObjSetVar2(interp, objv[1], NULL, varValuePtr, TCL_LEAVE_ERR_MSG); if (newValuePtr == NULL) { return TCL_ERROR; } } else { result = TclListObjLength(interp, newValuePtr, &numElems); if (result != TCL_OK) { return result; } } } else { /* * We have arguments to append. We used to call Tcl_SetVar2 to append * each argument one at a time to ensure that traces were run for each * append step. We now append the arguments all at once because it's * faster. Note that a read trace and a write trace for the variable * will now each only be called once. Also, if the variable's old * value is unshared we modify it directly, otherwise we create a new * copy to modify: this is "copy on write". */ createdNewObj = 0; /* * Protect the variable pointers around the TclPtrGetVar call * to insure that they remain valid even if the variable was undefined * and unused. */ varPtr = TclObjLookupVarEx(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG, "set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)++; } if (arrayPtr && TclIsVarInHash(arrayPtr)) { VarHashRefCount(arrayPtr)++; } varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, objv[1], NULL, TCL_LEAVE_ERR_MSG, -1); if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)--; } if (arrayPtr && TclIsVarInHash(arrayPtr)) { VarHashRefCount(arrayPtr)--; } if (varValuePtr == NULL) { /* * We couldn't read the old value: either the var doesn't yet * exist or it's an array element. If it's new, we will try to * create it with Tcl_ObjSetVar2 below. */ TclNewObj(varValuePtr); createdNewObj = 1; } else if (Tcl_IsShared(varValuePtr)) { varValuePtr = Tcl_DuplicateObj(varValuePtr); createdNewObj = 1; } result = TclListObjLength(interp, varValuePtr, &numElems); if (result == TCL_OK) { result = Tcl_ListObjReplace(interp, varValuePtr, numElems, 0, (objc-2), (objv+2)); } if (result != TCL_OK) { if (createdNewObj) { TclDecrRefCount(varValuePtr); /* Free unneeded obj. */ } return result; } /* * Now store the list object back into the variable. If there is an * error setting the new value, decrement its ref count if it was new * and we didn't create the variable. */ newValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1], NULL, varValuePtr, TCL_LEAVE_ERR_MSG, -1); if (newValuePtr == NULL) { return TCL_ERROR; } } /* * Set the interpreter's object result to refer to the variable's value * object. */ Tcl_SetObjResult(interp, newValuePtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_ArrayObjCmd -- * * This object-based function is invoked to process the "array" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_ArrayObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { /* * The list of constants below should match the arrayOptions string array * below. */ enum { ARRAY_ANYMORE, ARRAY_DONESEARCH, ARRAY_EXISTS, ARRAY_GET, ARRAY_NAMES, ARRAY_NEXTELEMENT, ARRAY_SET, ARRAY_SIZE, ARRAY_STARTSEARCH, ARRAY_STATISTICS, ARRAY_UNSET }; static const char *arrayOptions[] = { "anymore", "donesearch", "exists", "get", "names", "nextelement", "set", "size", "startsearch", "statistics", "unset", NULL }; Interp *iPtr = (Interp *) interp; Var *varPtr, *arrayPtr; Tcl_HashEntry *hPtr; Tcl_Obj *varNamePtr; int notArray; int index, result; if (objc < 3) { Tcl_WrongNumArgs(interp, 1, objv, "option arrayName ?arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], arrayOptions, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } /* * Locate the array variable */ varNamePtr = objv[2]; varPtr = TclObjLookupVarEx(interp, varNamePtr, NULL, /*flags*/ 0, /*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); /* * Special array trace used to keep the env array in sync for array names, * array get, etc. */ if (varPtr && (varPtr->flags & VAR_TRACED_ARRAY) && (TclIsVarArray(varPtr) || TclIsVarUndefined(varPtr))) { if (TclObjCallVarTraces(iPtr, arrayPtr, varPtr, varNamePtr, NULL, (TCL_LEAVE_ERR_MSG|TCL_NAMESPACE_ONLY|TCL_GLOBAL_ONLY| TCL_TRACE_ARRAY), /* leaveErrMsg */ 1, -1) == TCL_ERROR) { return TCL_ERROR; } } /* * Verify that it is indeed an array variable. This test comes after the * traces - the variable may actually become an array as an effect of said * traces. */ notArray = 0; if ((varPtr == NULL) || !TclIsVarArray(varPtr) || TclIsVarUndefined(varPtr)) { notArray = 1; } switch (index) { case ARRAY_ANYMORE: { ArraySearch *searchPtr; if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName searchId"); return TCL_ERROR; } if (notArray) { goto error; } searchPtr = ParseSearchId(interp, varPtr, varNamePtr, objv[3]); if (searchPtr == NULL) { return TCL_ERROR; } while (1) { Var *varPtr2; if (searchPtr->nextEntry != NULL) { varPtr2 = VarHashGetValue(searchPtr->nextEntry); if (!TclIsVarUndefined(varPtr2)) { break; } } searchPtr->nextEntry = Tcl_NextHashEntry(&searchPtr->search); if (searchPtr->nextEntry == NULL) { Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[0]); return TCL_OK; } } Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[1]); break; } case ARRAY_DONESEARCH: { ArraySearch *searchPtr, *prevPtr; if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName searchId"); return TCL_ERROR; } if (notArray) { goto error; } searchPtr = ParseSearchId(interp, varPtr, varNamePtr, objv[3]); if (searchPtr == NULL) { return TCL_ERROR; } hPtr = Tcl_FindHashEntry(&iPtr->varSearches,(char *) varPtr); if (searchPtr == Tcl_GetHashValue(hPtr)) { if (searchPtr->nextPtr) { Tcl_SetHashValue(hPtr, searchPtr->nextPtr); } else { varPtr->flags &= ~VAR_SEARCH_ACTIVE; Tcl_DeleteHashEntry(hPtr); } } else { for (prevPtr=Tcl_GetHashValue(hPtr) ;; prevPtr=prevPtr->nextPtr) { if (prevPtr->nextPtr == searchPtr) { prevPtr->nextPtr = searchPtr->nextPtr; break; } } } ckfree((char *) searchPtr); break; } case ARRAY_NEXTELEMENT: { ArraySearch *searchPtr; Tcl_HashEntry *hPtr; Var *varPtr2; if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName searchId"); return TCL_ERROR; } if (notArray) { goto error; } searchPtr = ParseSearchId(interp, varPtr, varNamePtr, objv[3]); if (searchPtr == NULL) { return TCL_ERROR; } while (1) { hPtr = searchPtr->nextEntry; if (hPtr == NULL) { hPtr = Tcl_NextHashEntry(&searchPtr->search); if (hPtr == NULL) { return TCL_OK; } } else { searchPtr->nextEntry = NULL; } varPtr2 = VarHashGetValue(hPtr); if (!TclIsVarUndefined(varPtr2)) { break; } } Tcl_SetObjResult(interp, VarHashGetKey(varPtr2)); break; } case ARRAY_STARTSEARCH: { ArraySearch *searchPtr; int isNew; char *varName = TclGetString(varNamePtr); if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName"); return TCL_ERROR; } if (notArray) { goto error; } searchPtr = (ArraySearch *) ckalloc(sizeof(ArraySearch)); hPtr = Tcl_CreateHashEntry(&iPtr->varSearches, (char *) varPtr, &isNew); if (isNew) { searchPtr->id = 1; Tcl_AppendResult(interp, "s-1-", varName, NULL); varPtr->flags |= VAR_SEARCH_ACTIVE; searchPtr->nextPtr = NULL; } else { char string[TCL_INTEGER_SPACE]; searchPtr->id = ((ArraySearch *) Tcl_GetHashValue(hPtr))->id + 1; TclFormatInt(string, searchPtr->id); Tcl_AppendResult(interp, "s-", string, "-", varName, NULL); searchPtr->nextPtr = Tcl_GetHashValue(hPtr); } searchPtr->varPtr = varPtr; searchPtr->nextEntry = VarHashFirstEntry(varPtr->value.tablePtr, &searchPtr->search); Tcl_SetHashValue(hPtr, searchPtr); break; } case ARRAY_EXISTS: if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName"); return TCL_ERROR; } Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[!notArray]); break; case ARRAY_GET: { Tcl_HashSearch search; Var *varPtr2; char *pattern = NULL; char *name; Tcl_Obj *namePtr, *valuePtr, *nameLstPtr, *tmpResPtr, **namePtrPtr; int i, count; if ((objc != 3) && (objc != 4)) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?"); return TCL_ERROR; } if (notArray) { return TCL_OK; } if (objc == 4) { pattern = TclGetString(objv[3]); } /* * Store the array names in a new object. */ TclNewObj(nameLstPtr); Tcl_IncrRefCount(nameLstPtr); if ((pattern != NULL) && TclMatchIsTrivial(pattern)) { varPtr2 = VarHashFindVar(varPtr->value.tablePtr, objv[3]); if (varPtr2 == NULL) { goto searchDone; } if (TclIsVarUndefined(varPtr2)) { goto searchDone; } result = Tcl_ListObjAppendElement(interp, nameLstPtr, VarHashGetKey(varPtr2)); if (result != TCL_OK) { TclDecrRefCount(nameLstPtr); return result; } goto searchDone; } for (varPtr2 = VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2; varPtr2 = VarHashNextVar(&search)) { if (TclIsVarUndefined(varPtr2)) { continue; } namePtr = VarHashGetKey(varPtr2); name = TclGetString(namePtr); if ((objc == 4) && !Tcl_StringMatch(name, pattern)) { continue; /* Element name doesn't match pattern. */ } result = Tcl_ListObjAppendElement(interp, nameLstPtr, namePtr); if (result != TCL_OK) { TclDecrRefCount(nameLstPtr); return result; } } searchDone: /* * Make sure the Var structure of the array is not removed by a trace * while we're working. */ if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)++; } /* * Get the array values corresponding to each element name. */ TclNewObj(tmpResPtr); result = Tcl_ListObjGetElements(interp, nameLstPtr, &count, &namePtrPtr); if (result != TCL_OK) { goto errorInArrayGet; } for (i=0 ; i<count ; i++) { namePtr = *namePtrPtr++; valuePtr = Tcl_ObjGetVar2(interp, objv[2], namePtr, TCL_LEAVE_ERR_MSG); if (valuePtr == NULL) { /* * Some trace played a trick on us; we need to diagnose to * adapt our behaviour: was the array element unset, or did * the modification modify the complete array? */ if (TclIsVarArray(varPtr)) { /* * The array itself looks OK, the variable was undefined: * forget it. */ continue; } else { result = TCL_ERROR; goto errorInArrayGet; } } result = Tcl_DictObjPut(interp, tmpResPtr, namePtr, valuePtr); if (result != TCL_OK) { goto errorInArrayGet; } } if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)--; } Tcl_SetObjResult(interp, tmpResPtr); TclDecrRefCount(nameLstPtr); break; errorInArrayGet: if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)--; } TclDecrRefCount(nameLstPtr); TclDecrRefCount(tmpResPtr); /* Free unneeded temp result. */ return result; } case ARRAY_NAMES: { Tcl_HashSearch search; Var *varPtr2; char *pattern; char *name; Tcl_Obj *namePtr, *resultPtr, *patternPtr; int mode, matched = 0; static const char *options[] = { "-exact", "-glob", "-regexp", NULL }; enum options { OPT_EXACT, OPT_GLOB, OPT_REGEXP }; mode = OPT_GLOB; if ((objc < 3) || (objc > 5)) { Tcl_WrongNumArgs(interp, 2,objv, "arrayName ?mode? ?pattern?"); return TCL_ERROR; } if (notArray) { return TCL_OK; } if (objc == 4) { patternPtr = objv[3]; pattern = TclGetString(patternPtr); } else if (objc == 5) { patternPtr = objv[4]; pattern = TclGetString(patternPtr); if (Tcl_GetIndexFromObj(interp, objv[3], options, "option", 0, &mode) != TCL_OK) { return TCL_ERROR; } } else { patternPtr = NULL; pattern = NULL; } TclNewObj(resultPtr); if (((enum options) mode)==OPT_GLOB && pattern!=NULL && TclMatchIsTrivial(pattern)) { varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternPtr); if ((varPtr2 != NULL) && !TclIsVarUndefined(varPtr2)) { result = Tcl_ListObjAppendElement(interp, resultPtr, VarHashGetKey(varPtr2)); if (result != TCL_OK) { TclDecrRefCount(resultPtr); return result; } } Tcl_SetObjResult(interp, resultPtr); return TCL_OK; } for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) { if (TclIsVarUndefined(varPtr2)) { continue; } namePtr = VarHashGetKey(varPtr2); name = TclGetString(namePtr); if (objc > 3) { switch ((enum options) mode) { case OPT_EXACT: matched = (strcmp(name, pattern) == 0); break; case OPT_GLOB: matched = Tcl_StringMatch(name, pattern); break; case OPT_REGEXP: matched = Tcl_RegExpMatch(interp, name, pattern); if (matched < 0) { TclDecrRefCount(resultPtr); return TCL_ERROR; } break; } if (matched == 0) { continue; } } result = Tcl_ListObjAppendElement(interp, resultPtr, namePtr); if (result != TCL_OK) { TclDecrRefCount(namePtr); /* Free unneeded name obj. */ return result; } } Tcl_SetObjResult(interp, resultPtr); break; } case ARRAY_SET: if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName list"); return TCL_ERROR; } return TclArraySet(interp, objv[2], objv[3]); case ARRAY_UNSET: { Tcl_HashSearch search; Var *varPtr2; char *pattern = NULL; if ((objc != 3) && (objc != 4)) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?"); return TCL_ERROR; } if (notArray) { return TCL_OK; } if (objc == 3) { /* * When no pattern is given, just unset the whole array. */ if (TclObjUnsetVar2(interp, varNamePtr, NULL, 0) != TCL_OK) { return TCL_ERROR; } } else { pattern = TclGetString(objv[3]); if (TclMatchIsTrivial(pattern)) { varPtr2 = VarHashFindVar(varPtr->value.tablePtr, objv[3]); if (varPtr2 != NULL && !TclIsVarUndefined(varPtr2)) { return TclObjUnsetVar2(interp, varNamePtr, objv[3], 0); } return TCL_OK; } for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) { Tcl_Obj *namePtr; if (TclIsVarUndefined(varPtr2)) { continue; } namePtr = VarHashGetKey(varPtr2); if (Tcl_StringMatch(TclGetString(namePtr), pattern) && TclObjUnsetVar2(interp, varNamePtr, namePtr, 0) != TCL_OK) { return TCL_ERROR; } } } break; } case ARRAY_SIZE: { Tcl_HashSearch search; Var *varPtr2; int size; if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName"); return TCL_ERROR; } size = 0; /* * Must iterate in order to get chance to check for present but * "undefined" entries. */ if (!notArray) { for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) { if (TclIsVarUndefined(varPtr2)) { continue; } size++; } } Tcl_SetObjResult(interp, Tcl_NewIntObj(size)); break; } case ARRAY_STATISTICS: { const char *stats; if (notArray) { goto error; } stats = Tcl_HashStats((Tcl_HashTable *) varPtr->value.tablePtr); if (stats != NULL) { Tcl_SetObjResult(interp, Tcl_NewStringObj(stats, -1)); ckfree((void *)stats); } else { Tcl_SetResult(interp,"error reading array statistics",TCL_STATIC); return TCL_ERROR; } break; } } return TCL_OK; error: Tcl_AppendResult(interp, "\"", TclGetString(varNamePtr), "\" isn't an array", NULL); return TCL_ERROR; }  /* *---------------------------------------------------------------------- * * TclArraySet -- * * Set the elements of an array. If there are no elements to set, create * an empty array. This routine is used by the Tcl_ArrayObjCmd and by the * TclSetupEnv routine. * * Results: * A standard Tcl result object. * * Side effects: * A variable will be created if one does not already exist. * *---------------------------------------------------------------------- */ int TclArraySet( Tcl_Interp *interp, /* Current interpreter. */ Tcl_Obj *arrayNameObj, /* The array name. */ Tcl_Obj *arrayElemObj) /* The array elements list or dict. If this is * NULL, create an empty array. */ { Var *varPtr, *arrayPtr; int result, i; varPtr = TclObjLookupVarEx(interp, arrayNameObj, NULL, /*flags*/ TCL_LEAVE_ERR_MSG, /*msg*/ "set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } if (arrayPtr) { CleanupVar(varPtr, arrayPtr); TclObjVarErrMsg(interp, arrayNameObj, NULL, "set", needArray, -1); return TCL_ERROR; } if (arrayElemObj == NULL) { goto ensureArray; } /* * Install the contents of the dictionary or list into the array. */ if (arrayElemObj->typePtr == &tclDictType) { Tcl_Obj *keyPtr, *valuePtr; Tcl_DictSearch search; int done; if (Tcl_DictObjSize(interp, arrayElemObj, &done) != TCL_OK) { return TCL_ERROR; } if (done == 0) { /* * Empty, so we'll just force the array to be properly existing * instead. */ goto ensureArray; } /* * Don't need to look at result of Tcl_DictObjFirst as we've just * successfully used a dictionary operation on the same object. */ for (Tcl_DictObjFirst(interp, arrayElemObj, &search, &keyPtr, &valuePtr, &done) ; !done ; Tcl_DictObjNext(&search, &keyPtr, &valuePtr, &done)) { /* * At this point, it would be nice if the key was directly usable * by the array. This isn't the case though. */ Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj, keyPtr, TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1); if ((elemVarPtr == NULL) || (TclPtrSetVar(interp, elemVarPtr, varPtr, arrayNameObj, keyPtr, valuePtr, TCL_LEAVE_ERR_MSG, -1) == NULL)) { Tcl_DictObjDone(&search); return TCL_ERROR; } } return TCL_OK; } else { /* * Not a dictionary, so assume (and convert to, for backward- * -compatability reasons) a list. */ int elemLen; Tcl_Obj **elemPtrs, *copyListObj; result = TclListObjGetElements(interp, arrayElemObj, &elemLen, &elemPtrs); if (result != TCL_OK) { return result; } if (elemLen & 1) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "list must have an even number of elements", -1)); return TCL_ERROR; } if (elemLen == 0) { goto ensureArray; } /* * We needn't worry about traces invalidating arrayPtr: should that be * the case, TclPtrSetVar will return NULL so that we break out of the * loop and return an error. */ copyListObj = TclListObjCopy(NULL, arrayElemObj); for (i=0 ; i<elemLen ; i+=2) { Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj, elemPtrs[i], TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1); if ((elemVarPtr == NULL) || (TclPtrSetVar(interp, elemVarPtr, varPtr, arrayNameObj, elemPtrs[i],elemPtrs[i+1],TCL_LEAVE_ERR_MSG,-1) == NULL)){ result = TCL_ERROR; break; } } Tcl_DecrRefCount(copyListObj); return result; } /* * The list is empty make sure we have an array, or create one if * necessary. */ ensureArray: if (varPtr != NULL) { if (TclIsVarArray(varPtr)) { /* * Already an array, done. */ return TCL_OK; } if (TclIsVarArrayElement(varPtr) || !TclIsVarUndefined(varPtr)) { /* * Either an array element, or a scalar: lose! */ TclObjVarErrMsg(interp, arrayNameObj, NULL, "array set", needArray, -1); return TCL_ERROR; } } TclSetVarArray(varPtr); varPtr->value.tablePtr = (TclVarHashTable *) ckalloc(sizeof(TclVarHashTable)); TclInitVarHashTable(varPtr->value.tablePtr, TclGetVarNsPtr(varPtr)); return TCL_OK; }  /* *---------------------------------------------------------------------- * * ObjMakeUpvar -- * * This function does all of the work of the "global" and "upvar" * commands. * * Results: * A standard Tcl completion code. If an error occurs then an error * message is left in iPtr->result. * * Side effects: * The variable given by myName is linked to the variable in framePtr * given by otherP1 and otherP2, so that references to myName are * redirected to the other variable like a symbolic link. * *---------------------------------------------------------------------- */ static int ObjMakeUpvar( Tcl_Interp *interp, /* Interpreter containing variables. Used for * error messages, too. */ CallFrame *framePtr, /* Call frame containing "other" variable. * NULL means use global :: context. */ Tcl_Obj *otherP1Ptr, const char *otherP2, /* Two-part name of variable in framePtr. */ const int otherFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of "other" variable. */ Tcl_Obj *myNamePtr, /* Name of variable which will refer to * otherP1/otherP2. Must be a scalar. */ int myFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of myName. */ int index) /* If the variable to be linked is an indexed * scalar, this is its index. Otherwise, -1 */ { Interp *iPtr = (Interp *) interp; Var *otherPtr, *arrayPtr; CallFrame *varFramePtr; /* * Find "other" in "framePtr". If not looking up other in just the current * namespace, temporarily replace the current var frame pointer in the * interpreter in order to use TclObjLookupVar. */ if (framePtr == NULL) { framePtr = iPtr->rootFramePtr; } varFramePtr = iPtr->varFramePtr; if (!(otherFlags & TCL_NAMESPACE_ONLY)) { iPtr->varFramePtr = framePtr; } otherPtr = TclObjLookupVar(interp, otherP1Ptr, otherP2, (otherFlags | TCL_LEAVE_ERR_MSG), "access", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (!(otherFlags & TCL_NAMESPACE_ONLY)) { iPtr->varFramePtr = varFramePtr; } if (otherPtr == NULL) { return TCL_ERROR; } /* * Check that we are not trying to create a namespace var linked to a * local variable in a procedure. If we allowed this, the local * variable in the shorter-lived procedure frame could go away leaving * the namespace var's reference invalid. */ if (index < 0) { if (!(arrayPtr != NULL ? (TclIsVarInHash(arrayPtr) && TclGetVarNsPtr(arrayPtr)) : (TclIsVarInHash(otherPtr) && TclGetVarNsPtr(otherPtr))) && ((myFlags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)) || (varFramePtr == NULL) || !HasLocalVars(varFramePtr) || (strstr(TclGetString(myNamePtr), "::") != NULL))) { Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"", TclGetString(myNamePtr), "\": upvar won't create " "namespace variable that refers to procedure variable", NULL); return TCL_ERROR; } } return TclPtrObjMakeUpvar(interp, otherPtr, myNamePtr, myFlags, index); }  /* *---------------------------------------------------------------------- * * TclPtrMakeUpvar -- * * This procedure does all of the work of the "global" and "upvar" * commands. * * Results: * A standard Tcl completion code. If an error occurs then an error * message is left in iPtr->result. * * Side effects: * The variable given by myName is linked to the variable in framePtr * given by otherP1 and otherP2, so that references to myName are * redirected to the other variable like a symbolic link. * *---------------------------------------------------------------------- */ int TclPtrMakeUpvar( Tcl_Interp *interp, /* Interpreter containing variables. Used for * error messages, too. */ Var *otherPtr, /* Pointer to the variable being linked-to. */ const char *myName, /* Name of variable which will refer to * otherP1/otherP2. Must be a scalar. */ int myFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of myName. */ int index) /* If the variable to be linked is an indexed * scalar, this is its index. Otherwise, -1 */ { Tcl_Obj *myNamePtr; int result; if (myName) { myNamePtr = Tcl_NewStringObj(myName, -1); Tcl_IncrRefCount(myNamePtr); } else { myNamePtr = NULL; } result = TclPtrObjMakeUpvar(interp, otherPtr, myNamePtr, myFlags, index); if (myNamePtr) { Tcl_DecrRefCount(myNamePtr); } return result; } int TclPtrObjMakeUpvar( Tcl_Interp *interp, /* Interpreter containing variables. Used for * error messages, too. */ Var *otherPtr, /* Pointer to the variable being linked-to. */ Tcl_Obj *myNamePtr, /* Name of variable which will refer to * otherP1/otherP2. Must be a scalar. */ int myFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of myName. */ int index) /* If the variable to be linked is an indexed * scalar, this is its index. Otherwise, -1 */ { Interp *iPtr = (Interp *) interp; CallFrame *varFramePtr = iPtr->varFramePtr; const char *errMsg, *p, *myName; Var *varPtr; if (index >= 0) { if (!HasLocalVars(varFramePtr)) { Tcl_Panic("ObjMakeUpvar called with an index outside from a proc"); } varPtr = (Var *) &(varFramePtr->compiledLocals[index]); myNamePtr = localName(iPtr->varFramePtr, index); myName = myNamePtr? TclGetString(myNamePtr) : NULL; } else { /* * Do not permit the new variable to look like an array reference, as * it will not be reachable in that case [Bug 600812, TIP 184]. The * "definition" of what "looks like an array reference" is consistent * (and must remain consistent) with the code in TclObjLookupVar(). */ myName = TclGetString(myNamePtr); p = strstr(myName, "("); if (p != NULL) { p += strlen(p)-1; if (*p == ')') { /* * myName looks like an array reference. */ Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"", myName, "\": upvar won't create a scalar variable " "that looks like an array element", NULL); return TCL_ERROR; } } /* * Lookup and eventually create the new variable. Set the flag bit * AVOID_RESOLVERS to indicate the special resolution rules for upvar * purposes: * - Bug #696893 - variable is either proc-local or in the current * namespace; never follow the second (global) resolution path. * - Bug #631741 - do not use special namespace or interp resolvers. */ varPtr = TclLookupSimpleVar(interp, myNamePtr, myFlags|AVOID_RESOLVERS, /* create */ 1, &errMsg, &index); if (varPtr == NULL) { TclObjVarErrMsg(interp, myNamePtr, NULL, "create", errMsg, -1); return TCL_ERROR; } } if (varPtr == otherPtr) { Tcl_SetResult((Tcl_Interp *) iPtr, "can't upvar from variable to itself", TCL_STATIC); return TCL_ERROR; } if (TclIsVarTraced(varPtr)) { Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName, "\" has traces: can't use for upvar", NULL); return TCL_ERROR; } else if (!TclIsVarUndefined(varPtr)) { /* * The variable already existed. Make sure this variable "varPtr" * isn't the same as "otherPtr" (avoid circular links). Also, if it's * not an upvar then it's an error. If it is an upvar, then just * disconnect it from the thing it currently refers to. */ if (TclIsVarLink(varPtr)) { Var *linkPtr = varPtr->value.linkPtr; if (linkPtr == otherPtr) { return TCL_OK; } if (TclIsVarInHash(linkPtr)) { VarHashRefCount(linkPtr)--; if (TclIsVarUndefined(linkPtr)) { CleanupVar(linkPtr, NULL); } } } else { Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName, "\" already exists", NULL); return TCL_ERROR; } } TclSetVarLink(varPtr); varPtr->value.linkPtr = otherPtr; if (TclIsVarInHash(otherPtr)) { VarHashRefCount(otherPtr)++; } return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_UpVar -- * * This function links one variable to another, just like the "upvar" * command. * * Results: * A standard Tcl completion code. If an error occurs then an error * message is left in the interp's result. * * Side effects: * The variable in frameName whose name is given by varName becomes * accessible under the name localName, so that references to localName * are redirected to the other variable like a symbolic link. * *---------------------------------------------------------------------- */ int Tcl_UpVar( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ const char *frameName, /* Name of the frame containing the source * variable, such as "1" or "#0". */ const char *varName, /* Name of a variable in interp to link to. * May be either a scalar name or an element * in an array. */ const char *localName, /* Name of link variable. */ int flags) /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of localName. */ { return Tcl_UpVar2(interp, frameName, varName, NULL, localName, flags); }  /* *---------------------------------------------------------------------- * * Tcl_UpVar2 -- * * This function links one variable to another, just like the "upvar" * command. * * Results: * A standard Tcl completion code. If an error occurs then an error * message is left in the interp's result. * * Side effects: * The variable in frameName whose name is given by part1 and part2 * becomes accessible under the name localName, so that references to * localName are redirected to the other variable like a symbolic link. * *---------------------------------------------------------------------- */ int Tcl_UpVar2( Tcl_Interp *interp, /* Interpreter containing variables. Used for * error messages too. */ const char *frameName, /* Name of the frame containing the source * variable, such as "1" or "#0". */ const char *part1, const char *part2, /* Two parts of source variable name to link * to. */ const char *localName, /* Name of link variable. */ int flags) /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of localName. */ { int result; CallFrame *framePtr; Tcl_Obj *part1Ptr, *localNamePtr; if (TclGetFrame(interp, frameName, &framePtr) == -1) { return TCL_ERROR; } part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); localNamePtr = Tcl_NewStringObj(localName, -1); Tcl_IncrRefCount(localNamePtr); result = ObjMakeUpvar(interp, framePtr, part1Ptr, part2, 0, localNamePtr, flags, -1); Tcl_DecrRefCount(part1Ptr); Tcl_DecrRefCount(localNamePtr); return result; }  /* *---------------------------------------------------------------------- * * Tcl_GetVariableFullName -- * * Given a Tcl_Var token returned by Tcl_FindNamespaceVar, this function * appends to an object the namespace variable's full name, qualified by * a sequence of parent namespace names. * * Results: * None. * * Side effects: * The variable's fully-qualified name is appended to the string * representation of objPtr. * *---------------------------------------------------------------------- */ void Tcl_GetVariableFullName( Tcl_Interp *interp, /* Interpreter containing the variable. */ Tcl_Var variable, /* Token for the variable returned by a * previous call to Tcl_FindNamespaceVar. */ Tcl_Obj *objPtr) /* Points to the object onto which the * variable's full name is appended. */ { Interp *iPtr = (Interp *) interp; register Var *varPtr = (Var *) variable; Tcl_Obj *namePtr; Namespace *nsPtr; /* * Add the full name of the containing namespace (if any), followed by the * "::" separator, then the variable name. */ if (varPtr) { if (!TclIsVarArrayElement(varPtr)) { nsPtr = TclGetVarNsPtr(varPtr); if (nsPtr) { Tcl_AppendToObj(objPtr, nsPtr->fullName, -1); if (nsPtr != iPtr->globalNsPtr) { Tcl_AppendToObj(objPtr, "::", 2); } } if (TclIsVarInHash(varPtr)) { if (!TclIsVarDeadHash(varPtr)) { namePtr = VarHashGetKey(varPtr); Tcl_AppendObjToObj(objPtr, namePtr); } } else if (iPtr->varFramePtr->procPtr) { int index = varPtr - iPtr->varFramePtr->compiledLocals; if (index < iPtr->varFramePtr->numCompiledLocals) { namePtr = localName(iPtr->varFramePtr, index); Tcl_AppendObjToObj(objPtr, namePtr); } } } } }  /* *---------------------------------------------------------------------- * * Tcl_GlobalObjCmd -- * * This object-based function is invoked to process the "global" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl object result value. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ int Tcl_GlobalObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; register Tcl_Obj *objPtr, *tailPtr; char *varName; register char *tail; int result, i; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "varName ?varName ...?"); return TCL_ERROR; } /* * If we are not executing inside a Tcl procedure, just return. */ if (!HasLocalVars(iPtr->varFramePtr)) { return TCL_OK; } for (i=1 ; i<objc ; i++) { /* * Make a local variable linked to its counterpart in the global :: * namespace. */ objPtr = objv[i]; varName = TclGetString(objPtr); /* * The variable name might have a scope qualifier, but the name for * the local "link" variable must be the simple name at the tail. */ for (tail=varName ; *tail!='\0' ; tail++) { /* empty body */ } while ((tail > varName) && ((*tail != ':') || (*(tail-1) != ':'))) { tail--; } if ((*tail == ':') && (tail > varName)) { tail++; } if (tail == varName) { tailPtr = objPtr; } else { tailPtr = Tcl_NewStringObj(tail, -1); Tcl_IncrRefCount(tailPtr); } /* * Link to the variable "varName" in the global :: namespace. */ result = ObjMakeUpvar(interp, NULL, objPtr, NULL, TCL_GLOBAL_ONLY, /*myName*/ tailPtr, /*myFlags*/ 0, -1); if (tail != varName) { Tcl_DecrRefCount(tailPtr); } if (result != TCL_OK) { return result; } } return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_VariableObjCmd -- * * Invoked to implement the "variable" command that creates one or more * global variables. Handles the following syntax: * * variable ?name value...? name ?value? * * One or more variables can be created. The variables are initialized * with the specified values. The value for the last variable is * optional. * * If the variable does not exist, it is created and given the optional * value. If it already exists, it is simply set to the optional value. * Normally, "name" is an unqualified name, so it is created in the * current namespace. If it includes namespace qualifiers, it can be * created in another namespace. * * If the variable command is executed inside a Tcl procedure, it creates * a local variable linked to the newly-created namespace variable. * * Results: * Returns TCL_OK if the variable is found or created. Returns TCL_ERROR * if anything goes wrong. * * Side effects: * If anything goes wrong, this function returns an error message as the * result in the interpreter's result object. * *---------------------------------------------------------------------- */ int Tcl_VariableObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; char *varName, *tail, *cp; Var *varPtr, *arrayPtr; Tcl_Obj *varValuePtr; int i, result; Tcl_Obj *varNamePtr, *tailPtr; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "?name value...? name ?value?"); return TCL_ERROR; } for (i=1 ; i<objc ; i+=2) { /* * Look up each variable in the current namespace context, creating it * if necessary. */ varNamePtr = objv[i]; varName = TclGetString(varNamePtr); varPtr = TclObjLookupVarEx(interp, varNamePtr, NULL, (TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), "define", /*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr); if (arrayPtr != NULL) { /* * Variable cannot be an element in an array. If arrayPtr is * non-NULL, it is, so throw up an error and return. */ TclObjVarErrMsg(interp, varNamePtr, NULL, "define", isArrayElement, -1); return TCL_ERROR; } if (varPtr == NULL) { return TCL_ERROR; } /* * Mark the variable as a namespace variable and increment its * reference count so that it will persist until its namespace is * destroyed or until the variable is unset. */ TclSetVarNamespaceVar(varPtr); /* * If a value was specified, set the variable to that value. * Otherwise, if the variable is new, leave it undefined. (If the * variable already exists and no value was specified, leave its value * unchanged; just create the local link if we're in a Tcl procedure). */ if (i+1 < objc) { /* A value was specified. */ varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, varNamePtr, NULL, objv[i+1], TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG,-1); if (varValuePtr == NULL) { return TCL_ERROR; } } /* * If we are executing inside a Tcl procedure, create a local variable * linked to the new namespace variable "varName". */ if (HasLocalVars(iPtr->varFramePtr)) { /* * varName might have a scope qualifier, but the name for the * local "link" variable must be the simple name at the tail. * * Locate tail in one pass: drop any prefix after two *or more* * consecutive ":" characters). */ for (tail=cp=varName ; *cp!='\0' ;) { if (*cp++ == ':') { while (*cp == ':') { tail = ++cp; } } } /* * Create a local link "tail" to the variable "varName" in the * current namespace. */ if (tail == varName) { tailPtr = varNamePtr; } else { tailPtr = Tcl_NewStringObj(tail, -1); Tcl_IncrRefCount(tailPtr); } result = ObjMakeUpvar(interp, NULL, varNamePtr, /*otherP2*/ NULL, /*otherFlags*/ TCL_NAMESPACE_ONLY, /*myName*/ tailPtr, /*myFlags*/ 0, -1); if (tail != varName) { Tcl_DecrRefCount(tailPtr); } if (result != TCL_OK) { return result; } } } return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_UpvarObjCmd -- * * This object-based function is invoked to process the "upvar" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl object result value. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_UpvarObjCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { CallFrame *framePtr; int result; if (objc < 3) { upvarSyntax: Tcl_WrongNumArgs(interp, 1, objv, "?level? otherVar localVar ?otherVar localVar ...?"); return TCL_ERROR; } /* * Find the call frame containing each of the "other variables" to be * linked to. */ result = TclObjGetFrame(interp, objv[1], &framePtr); if (result == -1) { return TCL_ERROR; } objc -= result+1; if ((objc & 1) != 0) { goto upvarSyntax; } objv += result+1; /* * Iterate over each (other variable, local variable) pair. Divide the * other variable name into two parts, then call MakeUpvar to do all the * work of linking it to the local variable. */ for (; objc>0 ; objc-=2, objv+=2) { result = ObjMakeUpvar(interp, framePtr, /* othervarName */ objv[0], NULL, 0, /* myVarName */ objv[1], /*flags*/ 0, -1); if (result != TCL_OK) { return TCL_ERROR; } } return TCL_OK; }  /* *---------------------------------------------------------------------- * * SetArraySearchObj -- * * This function converts the given tcl object into one that has the * "array search" internal type. * * Results: * TCL_OK if the conversion succeeded, and TCL_ERROR if it failed (when * an error message will be placed in the interpreter's result.) * * Side effects: * Updates the internal type and representation of the object to make * this an array-search object. See the tclArraySearchType declaration * above for details of the internal representation. * *---------------------------------------------------------------------- */ static int SetArraySearchObj( Tcl_Interp *interp, Tcl_Obj *objPtr) { char *string; char *end; int id; size_t offset; /* * Get the string representation. Make it up-to-date if necessary. */ string = TclGetString(objPtr); /* * Parse the id into the three parts separated by dashes. */ if ((string[0] != 's') || (string[1] != '-')) { goto syntax; } id = strtoul(string+2, &end, 10); if ((end == (string+2)) || (*end != '-')) { goto syntax; } /* * Can't perform value check in this context, so place reference to place * in string to use for the check in the object instead. */ end++; offset = end - string; TclFreeIntRep(objPtr); objPtr->typePtr = &tclArraySearchType; objPtr->internalRep.twoPtrValue.ptr1 = INT2PTR(id); objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(offset); return TCL_OK; syntax: Tcl_AppendResult(interp, "illegal search identifier \"",string,"\"",NULL); return TCL_ERROR; }  /* *---------------------------------------------------------------------- * * ParseSearchId -- * * This function translates from a tcl object to a pointer to an active * array search (if there is one that matches the string). * * Results: * The return value is a pointer to the array search indicated by string, * or NULL if there isn't one. If NULL is returned, the interp's result * contains an error message. * * Side effects: * The tcl object might have its internal type and representation * modified. * *---------------------------------------------------------------------- */ static ArraySearch * ParseSearchId( Tcl_Interp *interp, /* Interpreter containing variable. */ const Var *varPtr, /* Array variable search is for. */ Tcl_Obj *varNamePtr, /* Name of array variable that search is * supposed to be for. */ Tcl_Obj *handleObj) /* Object containing id of search. Must have * form "search-num-var" where "num" is a * decimal number and "var" is a variable * name. */ { Interp *iPtr = (Interp *) interp; register char *string; register size_t offset; int id; ArraySearch *searchPtr; char *varName = TclGetString(varNamePtr); /* * Parse the id. */ if (Tcl_ConvertToType(interp, handleObj, &tclArraySearchType) != TCL_OK) { return NULL; } /* * Extract the information out of the Tcl_Obj. */ #if 1 id = PTR2INT(handleObj->internalRep.twoPtrValue.ptr1); string = TclGetString(handleObj); offset = PTR2INT(handleObj->internalRep.twoPtrValue.ptr2); #else id = (int)(((char *) handleObj->internalRep.twoPtrValue.ptr1) - ((char *) NULL)); string = TclGetString(handleObj); offset = (((char *) handleObj->internalRep.twoPtrValue.ptr2) - ((char *) NULL)); #endif /* * This test cannot be placed inside the Tcl_Obj machinery, since it is * dependent on the variable context. */ if (strcmp(string+offset, varName) != 0) { Tcl_AppendResult(interp, "search identifier \"", string, "\" isn't for variable \"", varName, "\"", NULL); goto badLookup; } /* * Search through the list of active searches on the interpreter to see if * the desired one exists. * * Note that we cannot store the searchPtr directly in the Tcl_Obj as that * would run into trouble when DeleteSearches() was called so we must scan * this list every time. */ if (varPtr->flags & VAR_SEARCH_ACTIVE) { Tcl_HashEntry *hPtr = Tcl_FindHashEntry(&iPtr->varSearches, (char *) varPtr); for (searchPtr = (ArraySearch *) Tcl_GetHashValue(hPtr); searchPtr != NULL; searchPtr = searchPtr->nextPtr) { if (searchPtr->id == id) { return searchPtr; } } } Tcl_AppendResult(interp, "couldn't find search \"", string, "\"", NULL); badLookup: Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAYSEARCH", string, NULL); return NULL; }  /* *---------------------------------------------------------------------- * * DeleteSearches -- * * This function is called to free up all of the searches associated * with an array variable. * * Results: * None. * * Side effects: * Memory is released to the storage allocator. * *---------------------------------------------------------------------- */ static void DeleteSearches( Interp *iPtr, register Var *arrayVarPtr) /* Variable whose searches are to be * deleted. */ { ArraySearch *searchPtr, *nextPtr; Tcl_HashEntry *sPtr; if (arrayVarPtr->flags & VAR_SEARCH_ACTIVE) { sPtr = Tcl_FindHashEntry(&iPtr->varSearches, (char *) arrayVarPtr); for (searchPtr = (ArraySearch *) Tcl_GetHashValue(sPtr); searchPtr != NULL; searchPtr = nextPtr) { nextPtr = searchPtr->nextPtr; ckfree((char *) searchPtr); } arrayVarPtr->flags &= ~VAR_SEARCH_ACTIVE; Tcl_DeleteHashEntry(sPtr); } }  /* *---------------------------------------------------------------------- * * TclDeleteNamespaceVars -- * * This function is called to recycle all the storage space associated * with a namespace's table of variables. * * Results: * None. * * Side effects: * Variables are deleted and trace functions are invoked, if any are * declared. * *---------------------------------------------------------------------- */ void TclDeleteNamespaceVars( Namespace *nsPtr) { TclVarHashTable *tablePtr = &nsPtr->varTable; Tcl_Interp *interp = nsPtr->interp; Interp *iPtr = (Interp *)interp; Tcl_HashSearch search; int flags = 0; Var *varPtr; /* * Determine what flags to pass to the trace callback functions. */ if (nsPtr == iPtr->globalNsPtr) { flags = TCL_GLOBAL_ONLY; } else if (nsPtr == (Namespace *) TclGetCurrentNamespace(interp)) { flags = TCL_NAMESPACE_ONLY; } for (varPtr = VarHashFirstVar(tablePtr, &search); varPtr != NULL; varPtr = VarHashFirstVar(tablePtr, &search)) { VarHashRefCount(varPtr)++; /* Make sure we get to remove from * hash. */ UnsetVarStruct(varPtr, NULL, iPtr, /* part1 */ VarHashGetKey(varPtr), NULL, flags); /* * Remove the variable from the table and force it undefined in case * an unset trace brought it back from the dead. */ if (TclIsVarTraced(varPtr)) { Tcl_HashEntry *tPtr = Tcl_FindHashEntry(&iPtr->varTraces, (char *) varPtr); VarTrace *tracePtr = (VarTrace *) Tcl_GetHashValue(tPtr); while (tracePtr) { VarTrace *prevPtr = tracePtr; tracePtr = tracePtr->nextPtr; Tcl_EventuallyFree((ClientData) prevPtr, TCL_DYNAMIC); } Tcl_DeleteHashEntry(tPtr); varPtr->flags &= ~VAR_ALL_TRACES; } VarHashRefCount(varPtr)--; VarHashDeleteEntry(varPtr); } VarHashDeleteTable(tablePtr); }  /* *---------------------------------------------------------------------- * * TclDeleteVars -- * * This function is called to recycle all the storage space associated * with a table of variables. For this function to work correctly, it * must not be possible for any of the variables in the table to be * accessed from Tcl commands (e.g. from trace functions). * * Results: * None. * * Side effects: * Variables are deleted and trace functions are invoked, if any are * declared. * *---------------------------------------------------------------------- */ void TclDeleteVars( Interp *iPtr, /* Interpreter to which variables belong. */ TclVarHashTable *tablePtr) /* Hash table containing variables to * delete. */ { Tcl_Interp *interp = (Tcl_Interp *) iPtr; Tcl_HashSearch search; register Var *varPtr; int flags; Namespace *currNsPtr = (Namespace *) TclGetCurrentNamespace(interp); /* * Determine what flags to pass to the trace callback functions. */ flags = TCL_TRACE_UNSETS; if (tablePtr == &iPtr->globalNsPtr->varTable) { flags |= TCL_GLOBAL_ONLY; } else if (tablePtr == &currNsPtr->varTable) { flags |= TCL_NAMESPACE_ONLY; } for (varPtr = VarHashFirstVar(tablePtr, &search); varPtr != NULL; varPtr = VarHashNextVar(&search)) { /* * Lie about the validity of the hashtable entry. In this way the * variables will be deleted by VarHashDeleteTable. */ VarHashInvalidateEntry(varPtr); UnsetVarStruct(varPtr, NULL, iPtr, VarHashGetKey(varPtr), NULL, flags); } VarHashDeleteTable(tablePtr); }  /* *---------------------------------------------------------------------- * * TclDeleteCompiledLocalVars -- * * This function is called to recycle storage space associated with the * compiler-allocated array of local variables in a procedure call frame. * This function resembles TclDeleteVars above except that each variable * is stored in a call frame and not a hash table. For this function to * work correctly, it must not be possible for any of the variable in the * table to be accessed from Tcl commands (e.g. from trace functions). * * Results: * None. * * Side effects: * Variables are deleted and trace functions are invoked, if any are * declared. * *---------------------------------------------------------------------- */ void TclDeleteCompiledLocalVars( Interp *iPtr, /* Interpreter to which variables belong. */ CallFrame *framePtr) /* Procedure call frame containing compiler- * assigned local variables to delete. */ { register Var *varPtr; int numLocals, i; Tcl_Obj **namePtrPtr; numLocals = framePtr->numCompiledLocals; varPtr = framePtr->compiledLocals; namePtrPtr = &localName(framePtr, 0); for (i=0 ; i<numLocals ; i++, namePtrPtr++, varPtr++) { UnsetVarStruct(varPtr, NULL, iPtr, *namePtrPtr, NULL, TCL_TRACE_UNSETS); } }  /* *---------------------------------------------------------------------- * * DeleteArray -- * * This function is called to free up everything in an array variable. * It's the caller's responsibility to make sure that the array is no * longer accessible before this function is called. * * Results: * None. * * Side effects: * All storage associated with varPtr's array elements is deleted * (including the array's hash table). Deletion trace functions for * array elements are invoked, then deleted. Any pending traces for array * elements are also deleted. * *---------------------------------------------------------------------- */ static void DeleteArray( Interp *iPtr, /* Interpreter containing array. */ Tcl_Obj *arrayNamePtr, /* Name of array (used for trace callbacks), * or NULL if it is to be computed on * demand. */ Var *varPtr, /* Pointer to variable structure. */ int flags) /* Flags to pass to TclCallVarTraces: * TCL_TRACE_UNSETS and sometimes * TCL_NAMESPACE_ONLY or TCL_GLOBAL_ONLY. */ { Tcl_HashSearch search; Tcl_HashEntry *tPtr; register Var *elPtr; ActiveVarTrace *activePtr; Tcl_Obj *objPtr; VarTrace *tracePtr; if (varPtr->flags & VAR_SEARCH_ACTIVE) { DeleteSearches(iPtr, varPtr); } for (elPtr = VarHashFirstVar(varPtr->value.tablePtr, &search); elPtr != NULL; elPtr = VarHashNextVar(&search)) { if (TclIsVarScalar(elPtr) && (elPtr->value.objPtr != NULL)) { objPtr = elPtr->value.objPtr; TclDecrRefCount(objPtr); elPtr->value.objPtr = NULL; } /* * Lie about the validity of the hashtable entry. In this way the * variables will be deleted by VarHashDeleteTable. */ VarHashInvalidateEntry(elPtr); if (TclIsVarTraced(elPtr)) { /* * Compute the array name if it was not supplied. */ if (elPtr->flags & VAR_TRACED_UNSET) { Tcl_Obj *elNamePtr = VarHashGetKey(elPtr); elPtr->flags &= ~VAR_TRACE_ACTIVE; TclObjCallVarTraces(iPtr, NULL, elPtr, arrayNamePtr, elNamePtr, flags,/* leaveErrMsg */ 0, -1); } tPtr = Tcl_FindHashEntry(&iPtr->varTraces, (char *) elPtr); tracePtr = (VarTrace *) Tcl_GetHashValue(tPtr); while (tracePtr) { VarTrace *prevPtr = tracePtr; tracePtr = tracePtr->nextPtr; Tcl_EventuallyFree((ClientData) prevPtr, TCL_DYNAMIC); } Tcl_DeleteHashEntry(tPtr); elPtr->flags &= ~VAR_ALL_TRACES; for (activePtr = iPtr->activeVarTracePtr; activePtr != NULL; activePtr = activePtr->nextPtr) { if (activePtr->varPtr == elPtr) { activePtr->nextTracePtr = NULL; } } } TclSetVarUndefined(elPtr); /* * Even though array elements are not supposed to be namespace * variables, some combinations of [upvar] and [variable] may create * such beasts - see [Bug 604239]. This is necessary to avoid leaking * the corresponding Var struct, and is otherwise harmless. */ TclClearVarNamespaceVar(elPtr); } VarHashDeleteTable(varPtr->value.tablePtr); ckfree((char *) varPtr->value.tablePtr); }  /* *---------------------------------------------------------------------- * * TclTclObjVarErrMsg -- * * Generate a reasonable error message describing why a variable * operation failed. * * Results: * None. * * Side effects: * The interp's result is set to hold a message identifying the variable * given by part1 and part2 and describing why the variable operation * failed. * *---------------------------------------------------------------------- */ void TclVarErrMsg( Tcl_Interp *interp, /* Interpreter in which to record message. */ const char *part1, const char *part2, /* Variable's two-part name. */ const char *operation, /* String describing operation that failed, * e.g. "read", "set", or "unset". */ const char *reason) /* String describing why operation failed. */ { Tcl_Obj *part1Ptr = NULL, *part2Ptr = NULL; part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } else { part2 = NULL; } TclObjVarErrMsg(interp, part1Ptr, part2Ptr, operation, reason, -1); Tcl_DecrRefCount(part1Ptr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } } void TclObjVarErrMsg( Tcl_Interp *interp, /* Interpreter in which to record message. */ Tcl_Obj *part1Ptr, /* (may be NULL, if index >= 0) */ Tcl_Obj *part2Ptr, /* Variable's two-part name. */ const char *operation, /* String describing operation that failed, * e.g. "read", "set", or "unset". */ const char *reason, /* String describing why operation failed. */ int index) /* Index into the local variable table of the * variable, or -1. Only used when part1Ptr is * NULL. */ { Tcl_ResetResult(interp); if (!part1Ptr) { part1Ptr = localName(((Interp *)interp)->varFramePtr, index); } Tcl_AppendResult(interp, "can't ", operation, " \"", TclGetString(part1Ptr), NULL); if (part2Ptr) { Tcl_AppendResult(interp, "(", TclGetString(part2Ptr), ")", NULL); } Tcl_AppendResult(interp, "\": ", reason, NULL); }  /* *---------------------------------------------------------------------- * * Internal functions for variable name object types -- * *---------------------------------------------------------------------- */ /* * Panic functions that should never be called in normal operation. */ static void PanicOnUpdateVarName( Tcl_Obj *objPtr) { Tcl_Panic("%s of type %s should not be called", "updateStringProc", objPtr->typePtr->name); } static int PanicOnSetVarName( Tcl_Interp *interp, Tcl_Obj *objPtr) { Tcl_Panic("%s of type %s should not be called", "setFromAnyProc", objPtr->typePtr->name); return TCL_ERROR; } /* * localVarName - * * INTERNALREP DEFINITION: * ptrAndLongRep.ptr: pointer to name obj in varFramePtr->localCache * or NULL if it is this same obj * ptrAndLongRep.value: index into locals table */ static void FreeLocalVarName( Tcl_Obj *objPtr) { Tcl_Obj *namePtr = (Tcl_Obj *) objPtr->internalRep.ptrAndLongRep.ptr; if (namePtr) { Tcl_DecrRefCount(namePtr); } } static void DupLocalVarName( Tcl_Obj *srcPtr, Tcl_Obj *dupPtr) { Tcl_Obj *namePtr = srcPtr->internalRep.ptrAndLongRep.ptr; if (!namePtr) { namePtr = srcPtr; } dupPtr->internalRep.ptrAndLongRep.ptr = namePtr; Tcl_IncrRefCount(namePtr); dupPtr->internalRep.ptrAndLongRep.value = srcPtr->internalRep.ptrAndLongRep.value; dupPtr->typePtr = &localVarNameType; } #if ENABLE_NS_VARNAME_CACHING /* * nsVarName - * * INTERNALREP DEFINITION: * twoPtrValue.ptr1: pointer to the namespace containing the reference. * twoPtrValue.ptr2: pointer to the corresponding Var */ static void FreeNsVarName( Tcl_Obj *objPtr) { register Var *varPtr = objPtr->internalRep.twoPtrValue.ptr2; if (TclIsVarInHash(varPtr)) { varPtr->refCount--; if (TclIsVarUndefined(varPtr) && (varPtr->refCount == 0)) { CleanupVar(varPtr, NULL); } } } static void DupNsVarName( Tcl_Obj *srcPtr, Tcl_Obj *dupPtr) { Namespace *nsPtr = srcPtr->internalRep.twoPtrValue.ptr1; register Var *varPtr = srcPtr->internalRep.twoPtrValue.ptr2; dupPtr->internalRep.twoPtrValue.ptr1 = nsPtr; dupPtr->internalRep.twoPtrValue.ptr2 = varPtr; if (TclIsVarInHash(varPtr)) { varPtr->refCount++; } dupPtr->typePtr = &tclNsVarNameType; } #endif /* * parsedVarName - * * INTERNALREP DEFINITION: * twoPtrValue.ptr1 = pointer to the array name Tcl_Obj (NULL if scalar) * twoPtrValue.ptr2 = pointer to the element name string (owned by this * Tcl_Obj), or NULL if it is a scalar variable */ static void FreeParsedVarName( Tcl_Obj *objPtr) { register Tcl_Obj *arrayPtr = objPtr->internalRep.twoPtrValue.ptr1; register char *elem = objPtr->internalRep.twoPtrValue.ptr2; if (arrayPtr != NULL) { TclDecrRefCount(arrayPtr); ckfree(elem); } } static void DupParsedVarName( Tcl_Obj *srcPtr, Tcl_Obj *dupPtr) { register Tcl_Obj *arrayPtr = srcPtr->internalRep.twoPtrValue.ptr1; register char *elem = srcPtr->internalRep.twoPtrValue.ptr2; char *elemCopy; unsigned int elemLen; if (arrayPtr != NULL) { Tcl_IncrRefCount(arrayPtr); elemLen = strlen(elem); elemCopy = ckalloc(elemLen+1); memcpy(elemCopy, elem, elemLen); *(elemCopy + elemLen) = '\0'; elem = elemCopy; } dupPtr->internalRep.twoPtrValue.ptr1 = arrayPtr; dupPtr->internalRep.twoPtrValue.ptr2 = elem; dupPtr->typePtr = &tclParsedVarNameType; } static void UpdateParsedVarName( Tcl_Obj *objPtr) { Tcl_Obj *arrayPtr = objPtr->internalRep.twoPtrValue.ptr1; char *part2 = objPtr->internalRep.twoPtrValue.ptr2; char *part1, *p; int len1, len2, totalLen; if (arrayPtr == NULL) { /* * This is a parsed scalar name: what is it doing here? */ Tcl_Panic("scalar parsedVarName without a string rep"); } part1 = TclGetStringFromObj(arrayPtr, &len1); len2 = strlen(part2); totalLen = len1 + len2 + 2; p = ckalloc((unsigned int) totalLen + 1); objPtr->bytes = p; objPtr->length = totalLen; memcpy(p, part1, (unsigned int) len1); p += len1; *p++ = '('; memcpy(p, part2, (unsigned int) len2); p += len2; *p++ = ')'; *p = '\0'; }  /* *---------------------------------------------------------------------- * * Tcl_FindNamespaceVar -- MOVED OVER from tclNamesp.c * * Searches for a namespace variable, a variable not local to a * procedure. The variable can be either a scalar or an array, but may * not be an element of an array. * * Results: * Returns a token for the variable if it is found. Otherwise, if it * can't be found or there is an error, returns NULL and leaves an error * message in the interpreter's result object if "flags" contains * TCL_LEAVE_ERR_MSG. * * Side effects: * None. * *---------------------------------------------------------------------- */ Tcl_Var Tcl_FindNamespaceVar( Tcl_Interp *interp, /* The interpreter in which to find the * variable. */ const char *name, /* Variable's name. If it starts with "::", * will be looked up in global namespace. * Else, looked up first in contextNsPtr * (current namespace if contextNsPtr is * NULL), then in global namespace. */ Tcl_Namespace *contextNsPtr,/* Ignored if TCL_GLOBAL_ONLY flag set. * Otherwise, points to namespace in which to * resolve name. If NULL, look up name in the * current namespace. */ int flags) /* An OR'd combination of: AVOID_RESOLVERS, * TCL_GLOBAL_ONLY (look up name only in * global namespace), TCL_NAMESPACE_ONLY (look * up only in contextNsPtr, or the current * namespace if contextNsPtr is NULL), and * TCL_LEAVE_ERR_MSG. If both TCL_GLOBAL_ONLY * and TCL_NAMESPACE_ONLY are given, * TCL_GLOBAL_ONLY is ignored. */ { Tcl_Obj *namePtr = Tcl_NewStringObj(name, -1); Tcl_Var var; Tcl_IncrRefCount(namePtr); var = ObjFindNamespaceVar(interp, namePtr, contextNsPtr, flags); Tcl_DecrRefCount(namePtr); return var; } static Tcl_Var ObjFindNamespaceVar( Tcl_Interp *interp, /* The interpreter in which to find the * variable. */ Tcl_Obj *namePtr, /* Variable's name. If it starts with "::", * will be looked up in global namespace. * Else, looked up first in contextNsPtr * (current namespace if contextNsPtr is * NULL), then in global namespace. */ Tcl_Namespace *contextNsPtr,/* Ignored if TCL_GLOBAL_ONLY flag set. * Otherwise, points to namespace in which to * resolve name. If NULL, look up name in the * current namespace. */ int flags) /* An OR'd combination of: AVOID_RESOLVERS, * TCL_GLOBAL_ONLY (look up name only in * global namespace), TCL_NAMESPACE_ONLY (look * up only in contextNsPtr, or the current * namespace if contextNsPtr is NULL), and * TCL_LEAVE_ERR_MSG. If both TCL_GLOBAL_ONLY * and TCL_NAMESPACE_ONLY are given, * TCL_GLOBAL_ONLY is ignored. */ { Interp *iPtr = (Interp *) interp; ResolverScheme *resPtr; Namespace *nsPtr[2], *cxtNsPtr; const char *simpleName; Var *varPtr; register int search; int result; Tcl_Var var; Tcl_Obj *simpleNamePtr; char *name = TclGetString(namePtr); /* * If this namespace has a variable resolver, then give it first crack at * the variable resolution. It may return a Tcl_Var value, it may signal * to continue onward, or it may signal an error. */ if ((flags & TCL_GLOBAL_ONLY) != 0) { cxtNsPtr = (Namespace *) TclGetGlobalNamespace(interp); } else if (contextNsPtr != NULL) { cxtNsPtr = (Namespace *) contextNsPtr; } else { cxtNsPtr = (Namespace *) TclGetCurrentNamespace(interp); } if (!(flags & AVOID_RESOLVERS) && (cxtNsPtr->varResProc != NULL || iPtr->resolverPtr != NULL)) { resPtr = iPtr->resolverPtr; if (cxtNsPtr->varResProc) { result = (*cxtNsPtr->varResProc)(interp, name, (Tcl_Namespace *) cxtNsPtr, flags, &var); } else { result = TCL_CONTINUE; } while (result == TCL_CONTINUE && resPtr) { if (resPtr->varResProc) { result = (*resPtr->varResProc)(interp, name, (Tcl_Namespace *) cxtNsPtr, flags, &var); } resPtr = resPtr->nextPtr; } if (result == TCL_OK) { return var; } else if (result != TCL_CONTINUE) { return (Tcl_Var) NULL; } } /* * Find the namespace(s) that contain the variable. */ TclGetNamespaceForQualName(interp, name, (Namespace *) contextNsPtr, flags, &nsPtr[0], &nsPtr[1], &cxtNsPtr, &simpleName); /* * Look for the variable in the variable table of its namespace. Be sure * to check both possible search paths: from the specified namespace * context and from the global namespace. */ varPtr = NULL; if (simpleName != name) { simpleNamePtr = Tcl_NewStringObj(simpleName, -1); Tcl_IncrRefCount(simpleNamePtr); } else { simpleNamePtr = namePtr; } for (search = 0; (search < 2) && (varPtr == NULL); search++) { if ((nsPtr[search] != NULL) && (simpleName != NULL)) { varPtr = VarHashFindVar(&nsPtr[search]->varTable, simpleNamePtr); } } if (simpleName != name) { Tcl_DecrRefCount(simpleNamePtr); } if ((varPtr == NULL) && (flags & TCL_LEAVE_ERR_MSG)) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "unknown variable \"", name, "\"", NULL); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARIABLE", name, NULL); } return (Tcl_Var) varPtr; }  /* *---------------------------------------------------------------------- * * InfoVarsCmd -- (moved over from tclCmdIL.c) * * Called to implement the "info vars" command that returns the list of * variables in the interpreter that match an optional pattern. The * pattern, if any, consists of an optional sequence of namespace names * separated by "::" qualifiers, which is followed by a glob-style * pattern that restricts which variables are returned. Handles the * following syntax: * * info vars ?pattern? * * Results: * Returns TCL_OK if successful and TCL_ERROR if there is an error. * * Side effects: * Returns a result in the interpreter's result object. If there is an * error, the result is an error message. * *---------------------------------------------------------------------- */ int TclInfoVarsCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; char *varName, *pattern; const char *simplePattern; Tcl_HashSearch search; Var *varPtr; Namespace *nsPtr; Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp); Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp); Tcl_Obj *listPtr, *elemObjPtr; int specificNsInPattern = 0;/* Init. to avoid compiler warning. */ Tcl_Obj *simplePatternPtr = NULL, *varNamePtr; /* * Get the pattern and find the "effective namespace" in which to list * variables. We only use this effective namespace if there's no active * Tcl procedure frame. */ if (objc == 1) { simplePattern = NULL; nsPtr = currNsPtr; specificNsInPattern = 0; } else if (objc == 2) { /* * From the pattern, get the effective namespace and the simple * pattern (no namespace qualifiers or ::'s) at the end. If an error * was found while parsing the pattern, return it. Otherwise, if the * namespace wasn't found, just leave nsPtr NULL: we will return an * empty list since no variables there can be found. */ Namespace *dummy1NsPtr, *dummy2NsPtr; pattern = TclGetString(objv[1]); TclGetNamespaceForQualName(interp, pattern, (Namespace *) NULL, /*flags*/ 0, &nsPtr, &dummy1NsPtr, &dummy2NsPtr, &simplePattern); if (nsPtr != NULL) { /* We successfully found the pattern's ns. */ specificNsInPattern = (strcmp(simplePattern, pattern) != 0); if (simplePattern == pattern) { simplePatternPtr = objv[1]; } else { simplePatternPtr = Tcl_NewStringObj(simplePattern, -1); } Tcl_IncrRefCount(simplePatternPtr); } } else { Tcl_WrongNumArgs(interp, 1, objv, "?pattern?"); return TCL_ERROR; } /* * If the namespace specified in the pattern wasn't found, just return. */ if (nsPtr == NULL) { return TCL_OK; } listPtr = Tcl_NewListObj(0, NULL); if (!(iPtr->varFramePtr->isProcCallFrame & FRAME_IS_PROC) || specificNsInPattern) { /* * There is no frame pointer, the frame pointer was pushed only to * activate a namespace, or we are in a procedure call frame but a * specific namespace was specified. Create a list containing only the * variables in the effective namespace's variable table. */ if (simplePattern && TclMatchIsTrivial(simplePattern)) { /* * If we can just do hash lookups, that simplifies things a lot. */ varPtr = VarHashFindVar(&nsPtr->varTable, simplePatternPtr); if (varPtr) { if (!TclIsVarUndefined(varPtr) || TclIsVarNamespaceVar(varPtr)) { if (specificNsInPattern) { elemObjPtr = Tcl_NewObj(); Tcl_GetVariableFullName(interp, (Tcl_Var) varPtr, elemObjPtr); } else { elemObjPtr = VarHashGetKey(varPtr); } Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr); } } else if ((nsPtr != globalNsPtr) && !specificNsInPattern) { varPtr = VarHashFindVar(&globalNsPtr->varTable, simplePatternPtr); if (varPtr) { if (!TclIsVarUndefined(varPtr) || TclIsVarNamespaceVar(varPtr)) { Tcl_ListObjAppendElement(interp, listPtr, VarHashGetKey(varPtr)); } } } } else { /* * Have to scan the tables of variables. */ varPtr = VarHashFirstVar(&nsPtr->varTable, &search); while (varPtr) { if (!TclIsVarUndefined(varPtr) || TclIsVarNamespaceVar(varPtr)) { varNamePtr = VarHashGetKey(varPtr); varName = TclGetString(varNamePtr); if ((simplePattern == NULL) || Tcl_StringMatch(varName, simplePattern)) { if (specificNsInPattern) { elemObjPtr = Tcl_NewObj(); Tcl_GetVariableFullName(interp, (Tcl_Var) varPtr, elemObjPtr); } else { elemObjPtr = varNamePtr; } Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr); } } varPtr = VarHashNextVar(&search); } /* * If the effective namespace isn't the global :: namespace, and a * specific namespace wasn't requested in the pattern (i.e., the * pattern only specifies variable names), then add in all global * :: variables that match the simple pattern. Of course, add in * only those variables that aren't hidden by a variable in the * effective namespace. */ if ((nsPtr != globalNsPtr) && !specificNsInPattern) { varPtr = VarHashFirstVar(&globalNsPtr->varTable,&search); while (varPtr) { if (!TclIsVarUndefined(varPtr) || TclIsVarNamespaceVar(varPtr)) { varNamePtr = VarHashGetKey(varPtr); varName = TclGetString(varNamePtr); if ((simplePattern == NULL) || Tcl_StringMatch(varName, simplePattern)) { if (VarHashFindVar(&nsPtr->varTable, varNamePtr) == NULL) { Tcl_ListObjAppendElement(interp, listPtr, varNamePtr); } } } varPtr = VarHashNextVar(&search); } } } } else if (((Interp *)interp)->varFramePtr->procPtr != NULL) { AppendLocals(interp, listPtr, simplePatternPtr, 1); } if (simplePatternPtr) { Tcl_DecrRefCount(simplePatternPtr); } Tcl_SetObjResult(interp, listPtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * InfoGlobalsCmd -- (moved over from tclCmdIL.c) * * Called to implement the "info globals" command that returns the list * of global variables matching an optional pattern. Handles the * following syntax: * * info globals ?pattern? * * Results: * Returns TCL_OK if successful and TCL_ERROR if there is an error. * * Side effects: * Returns a result in the interpreter's result object. If there is an * error, the result is an error message. * *---------------------------------------------------------------------- */ int TclInfoGlobalsCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { char *varName, *pattern; Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp); Tcl_HashSearch search; Var *varPtr; Tcl_Obj *listPtr, *varNamePtr, *patternPtr; if (objc == 1) { pattern = NULL; } else if (objc == 2) { pattern = TclGetString(objv[1]); /* * Strip leading global-namespace qualifiers. [Bug 1057461] */ if (pattern[0] == ':' && pattern[1] == ':') { while (*pattern == ':') { pattern++; } } } else { Tcl_WrongNumArgs(interp, 1, objv, "?pattern?"); return TCL_ERROR; } /* * Scan through the global :: namespace's variable table and create a list * of all global variables that match the pattern. */ listPtr = Tcl_NewListObj(0, NULL); if (pattern != NULL && TclMatchIsTrivial(pattern)) { if (pattern == TclGetString(objv[1])) { patternPtr = objv[1]; } else { patternPtr = Tcl_NewStringObj(pattern, -1); } Tcl_IncrRefCount(patternPtr); varPtr = VarHashFindVar(&globalNsPtr->varTable, patternPtr); if (varPtr) { if (!TclIsVarUndefined(varPtr)) { Tcl_ListObjAppendElement(interp, listPtr, VarHashGetKey(varPtr)); } } Tcl_DecrRefCount(patternPtr); } else { for (varPtr = VarHashFirstVar(&globalNsPtr->varTable, &search); varPtr != NULL; varPtr = VarHashNextVar(&search)) { if (TclIsVarUndefined(varPtr)) { continue; } varNamePtr = VarHashGetKey(varPtr); varName = TclGetString(varNamePtr); if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) { Tcl_ListObjAppendElement(interp, listPtr, varNamePtr); } } } Tcl_SetObjResult(interp, listPtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * TclInfoLocalsCmd -- (moved over from tclCmdIl.c) * * Called to implement the "info locals" command to return a list of * local variables that match an optional pattern. Handles the following * syntax: * * info locals ?pattern? * * Results: * Returns TCL_OK if successful and TCL_ERROR if there is an error. * * Side effects: * Returns a result in the interpreter's result object. If there is an * error, the result is an error message. * *---------------------------------------------------------------------- */ int TclInfoLocalsCmd( ClientData dummy, /* Not used. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; Tcl_Obj *patternPtr; Tcl_Obj *listPtr; if (objc == 1) { patternPtr = NULL; } else if (objc == 2) { patternPtr = objv[1]; } else { Tcl_WrongNumArgs(interp, 1, objv, "?pattern?"); return TCL_ERROR; } if (!(iPtr->varFramePtr->isProcCallFrame & FRAME_IS_PROC )) { return TCL_OK; } /* * Return a list containing names of first the compiled locals (i.e. the * ones stored in the call frame), then the variables in the local hash * table (if one exists). */ listPtr = Tcl_NewListObj(0, NULL); AppendLocals(interp, listPtr, patternPtr, 0); Tcl_SetObjResult(interp, listPtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * AppendLocals -- * * Append the local variables for the current frame to the specified list * object. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void AppendLocals( Tcl_Interp *interp, /* Current interpreter. */ Tcl_Obj *listPtr, /* List object to append names to. */ Tcl_Obj *patternPtr, /* Pattern to match against. */ int includeLinks) /* 1 if upvars should be included, else 0. */ { Interp *iPtr = (Interp *) interp; Var *varPtr; int i, localVarCt; Tcl_Obj **varNamePtr; char *varName; TclVarHashTable *localVarTablePtr; Tcl_HashSearch search; const char *pattern = patternPtr? TclGetString(patternPtr) : NULL; Tcl_Obj *objNamePtr; localVarCt = iPtr->varFramePtr->numCompiledLocals; varPtr = iPtr->varFramePtr->compiledLocals; localVarTablePtr = iPtr->varFramePtr->varTablePtr; varNamePtr = &iPtr->varFramePtr->localCachePtr->varName0; for (i = 0; i < localVarCt; i++, varNamePtr++) { /* * Skip nameless (temporary) variables and undefined variables. */ if (*varNamePtr && !TclIsVarUndefined(varPtr) && (includeLinks || !TclIsVarLink(varPtr))) { varName = TclGetString(*varNamePtr); if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) { Tcl_ListObjAppendElement(interp, listPtr, *varNamePtr); } } varPtr++; } /* * Do nothing if no local variables. */ if (localVarTablePtr == NULL) { return; } /* * Check for the simple and fast case. */ if ((pattern != NULL) && TclMatchIsTrivial(pattern)) { varPtr = VarHashFindVar(localVarTablePtr, patternPtr); if (varPtr != NULL) { if (!TclIsVarUndefined(varPtr) && (includeLinks || !TclIsVarLink(varPtr))) { Tcl_ListObjAppendElement(interp, listPtr, VarHashGetKey(varPtr)); } } return; } /* * Scan over and process all local variables. */ for (varPtr = VarHashFirstVar(localVarTablePtr, &search); varPtr != NULL; varPtr = VarHashNextVar(&search)) { if (!TclIsVarUndefined(varPtr) && (includeLinks || !TclIsVarLink(varPtr))) { objNamePtr = VarHashGetKey(varPtr); varName = TclGetString(objNamePtr); if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) { Tcl_ListObjAppendElement(interp, listPtr, objNamePtr); } } } }  /* * Hash table implementation - first, just copy and adapt the obj key stuff */ void TclInitVarHashTable( TclVarHashTable *tablePtr, Namespace *nsPtr) { Tcl_InitCustomHashTable(&tablePtr->table, TCL_CUSTOM_TYPE_KEYS, &tclVarHashKeyType); tablePtr->nsPtr = nsPtr; } static Tcl_HashEntry * AllocVarEntry( Tcl_HashTable *tablePtr, /* Hash table. */ void *keyPtr) /* Key to store in the hash table entry. */ { Tcl_Obj *objPtr = (Tcl_Obj *) keyPtr; Tcl_HashEntry *hPtr; Var *varPtr; varPtr = (Var *) ckalloc(sizeof(VarInHash)); varPtr->flags = VAR_IN_HASHTABLE; varPtr->value.objPtr = NULL; VarHashRefCount(varPtr) = 1; hPtr = &(((VarInHash *)varPtr)->entry); Tcl_SetHashValue(hPtr, varPtr); hPtr->key.objPtr = objPtr; Tcl_IncrRefCount(objPtr); return hPtr; } static void FreeVarEntry( Tcl_HashEntry *hPtr) { Var *varPtr = VarHashGetValue(hPtr); Tcl_Obj *objPtr = hPtr->key.objPtr; if (TclIsVarUndefined(varPtr) && !TclIsVarTraced(varPtr) && (VarHashRefCount(varPtr) == 1)) { ckfree((char *) varPtr); } else { VarHashInvalidateEntry(varPtr); TclSetVarUndefined(varPtr); VarHashRefCount(varPtr)--; } Tcl_DecrRefCount(objPtr); } static int CompareVarKeys( void *keyPtr, /* New key to compare. */ Tcl_HashEntry *hPtr) /* Existing key to compare. */ { Tcl_Obj *objPtr1 = (Tcl_Obj *) keyPtr; Tcl_Obj *objPtr2 = hPtr->key.objPtr; register const char *p1, *p2; register int l1, l2; /* * If the object pointers are the same then they match. */ if (objPtr1 == objPtr2) { return 1; } /* * Don't use Tcl_GetStringFromObj as it would prevent l1 and l2 being in a * register. */ p1 = TclGetString(objPtr1); l1 = objPtr1->length; p2 = TclGetString(objPtr2); l2 = objPtr2->length; /* * Only compare if the string representations are of the same length. */ if (l1 == l2) { for (;; p1++, p2++, l1--) { if (*p1 != *p2) { break; } if (l1 == 0) { return 1; } } } return 0; } static unsigned int HashVarKey( Tcl_HashTable *tablePtr, /* Hash table. */ void *keyPtr) /* Key from which to compute hash value. */ { Tcl_Obj *objPtr = (Tcl_Obj *) keyPtr; const char *string = TclGetString(objPtr); int length = objPtr->length; unsigned int result = 0; int i; /* * I tried a zillion different hash functions and asked many other people * for advice. Many people had their own favorite functions, all * different, but no-one had much idea why they were good ones. I chose * the one below (multiply by 9 and add new character) because of the * following reasons: * * 1. Multiplying by 10 is perfect for keys that are decimal strings, and * multiplying by 9 is just about as good. * 2. Times-9 is (shift-left-3) plus (old). This means that each * character's bits hang around in the low-order bits of the hash value * for ever, plus they spread fairly rapidly up to the high-order bits * to fill out the hash value. This seems works well both for decimal * and non-decimal strings. */ for (i=0 ; i<length ; i++) { result += (result << 3) + string[i]; } return result; }  /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */

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