/* * 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 © 1987-1994 The Regents of the University of California. * Copyright © 1994-1997 Sun Microsystems, Inc. * Copyright © 1998-1999 Scriptics Corporation. * Copyright © 2001 Kevin B. Kenny. All rights reserved. * Copyright © 2007 Miguel Sofer * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "tclInt.h" #include "tclOOInt.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 const Tcl_HashKeyType tclVarHashKeyType = { TCL_HASH_KEY_TYPE_VERSION, /* version */ TCL_HASH_KEY_DIRECT_COMPARE,/* allows compare keys by pointers */ TclHashObjKey, /* 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 - offsetof(VarInHash, entry))) /* * NOTE: VarHashCreateVar increments the recount of its key argument. * All callers that will call Tcl_DecrRefCount on that argument must * call Tcl_IncrRefCount on it before passing it in. This requirement * can bubble up to callers of callers .... etc. */ static inline Var * VarHashCreateVar( TclVarHashTable *tablePtr, Tcl_Obj *key, int *newPtr) { Tcl_HashEntry *hPtr = Tcl_CreateHashEntry(&tablePtr->table, key, newPtr); if (!hPtr) { return NULL; } return VarHashGetValue(hPtr); } #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(&(tablePtr)->table, (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 NULL; } return VarHashGetValue(hPtr); } static inline Var * VarHashNextVar( Tcl_HashSearch *searchPtr) { Tcl_HashEntry *hPtr = VarHashNextEntry(searchPtr); if (!hPtr) { return NULL; } return VarHashGetValue(hPtr); } #define VarHashDeleteTable(tablePtr) \ Tcl_DeleteHashTable(&(tablePtr)->table) /* * 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"; static const char ISCONST[] = "variable is a constant"; static const char EXISTS[] = "variable already exists"; /* * 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) /* * The following structure describes an enumerative search in progress on an * array variable; this are invoked with options to the "array" command. */ typedef struct ArraySearch { Tcl_Obj *name; /* Name of this search */ int id; /* Integer id used to distinguish among * multiple concurrent searches for the same * array. */ struct Var *varPtr; /* Pointer to array variable that's being * searched. */ Tcl_HashSearch search; /* Info kept by the hash module about progress * through the array. */ Tcl_HashEntry *nextEntry; /* Non-null means this is the next element to * be enumerated (it's leftover from the * Tcl_FirstHashEntry call or from an "array * anymore" command). NULL means must call * Tcl_NextHashEntry to get value to * return. */ struct ArraySearch *nextPtr;/* Next in list of all active searches for * this variable, or NULL if this is the last * one. */ } ArraySearch; /* * TIP #508: [array default] * * The following structure extends the regular TclVarHashTable used by array * variables to store their optional default value. */ typedef struct ArrayVarHashTable { TclVarHashTable table; Tcl_Obj *defaultObj; } ArrayVarHashTable; /* * Forward references to functions defined later in this file: */ static void AppendLocals(Tcl_Interp *interp, Tcl_Obj *listPtr, Tcl_Obj *patternPtr, int includeLinks, int justConstants); static void ArrayPopulateSearch(Tcl_Interp *interp, Tcl_Obj *arrayNameObj, Var *varPtr, ArraySearch *searchPtr); static void ArrayDoneSearch(Interp *iPtr, Var *varPtr, ArraySearch *searchPtr); static Tcl_NRPostProc ArrayForLoopCallback; static Tcl_ObjCmdProc ArrayForNRCmd; static void DeleteSearches(Interp *iPtr, Var *arrayVarPtr); static void DeleteArray(Interp *iPtr, Tcl_Obj *arrayNamePtr, Var *varPtr, int flags, int index); static int LocateArray(Tcl_Interp *interp, Tcl_Obj *name, Var **varPtrPtr, int *isArrayPtr); static int NotArrayError(Tcl_Interp *interp, Tcl_Obj *name); 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, 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, int index); /* * TIP #508: [array default] */ static Tcl_ObjCmdProc ArrayDefaultCmd; static void DeleteArrayVar(Var *arrayPtr); static void SetArrayDefault(Var *arrayPtr, Tcl_Obj *defaultObj); /* * 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, int create, const char **errMsgPtr, int *indexPtr); static Tcl_DupInternalRepProc DupLocalVarName; static Tcl_FreeInternalRepProc FreeLocalVarName; static Tcl_FreeInternalRepProc FreeParsedVarName; static Tcl_DupInternalRepProc DupParsedVarName; /* * Types of Tcl_Objs used to cache variable lookups. * * localVarName - INTERNALREP DEFINITION: * twoPtrValue.ptr1: pointer to name obj in varFramePtr->localCache * or NULL if it is this same obj * twoPtrValue.ptr2: index into locals table * * 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 const Tcl_ObjType localVarNameType = { "localVarName", FreeLocalVarName, DupLocalVarName, NULL, NULL, TCL_OBJTYPE_V0 }; #define LocalSetInternalRep(objPtr, index, namePtr) \ do { \ Tcl_ObjInternalRep ir; \ Tcl_Obj *ptr = (namePtr); \ if (ptr) {Tcl_IncrRefCount(ptr);} \ ir.twoPtrValue.ptr1 = ptr; \ ir.twoPtrValue.ptr2 = INT2PTR(index); \ Tcl_StoreInternalRep((objPtr), &localVarNameType, &ir); \ } while (0) #define LocalGetInternalRep(objPtr, index, name) \ do { \ const Tcl_ObjInternalRep *irPtr; \ irPtr = TclFetchInternalRep((objPtr), &localVarNameType); \ (name) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr1 : NULL; \ (index) = irPtr ? PTR2INT(irPtr->twoPtrValue.ptr2) : TCL_INDEX_NONE; \ } while (0) static const Tcl_ObjType parsedVarNameType = { "parsedVarName", FreeParsedVarName, DupParsedVarName, NULL, NULL, TCL_OBJTYPE_V0 }; #define ParsedSetInternalRep(objPtr, arrayPtr, elem) \ do { \ Tcl_ObjInternalRep ir; \ Tcl_Obj *ptr1 = (arrayPtr); \ Tcl_Obj *ptr2 = (elem); \ if (ptr1) {Tcl_IncrRefCount(ptr1);} \ if (ptr2) {Tcl_IncrRefCount(ptr2);} \ ir.twoPtrValue.ptr1 = ptr1; \ ir.twoPtrValue.ptr2 = ptr2; \ Tcl_StoreInternalRep((objPtr), &parsedVarNameType, &ir); \ } while (0) #define ParsedGetInternalRep(objPtr, parsed, array, elem) \ do { \ const Tcl_ObjInternalRep *irPtr; \ irPtr = TclFetchInternalRep((objPtr), &parsedVarNameType); \ (parsed) = (irPtr != NULL); \ (array) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr1 : NULL; \ (elem) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr2 : NULL; \ } while (0) 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; } static int LocateArray( Tcl_Interp *interp, Tcl_Obj *name, Var **varPtrPtr, int *isArrayPtr) { Var *arrayPtr, *varPtr = TclObjLookupVarEx(interp, name, NULL, /*flags*/ 0, /*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); if (TclCheckArrayTraces(interp, varPtr, arrayPtr, name, -1) == TCL_ERROR) { return TCL_ERROR; } if (varPtrPtr) { *varPtrPtr = varPtr; } if (isArrayPtr) { *isArrayPtr = varPtr && !TclIsVarUndefined(varPtr) && TclIsVarArray(varPtr); } return TCL_OK; } static int NotArrayError( Tcl_Interp *interp, Tcl_Obj *name) { const char *nameStr = TclGetString(name); Tcl_SetObjResult(interp, Tcl_ObjPrintf("\"%s\" isn't an array", nameStr)); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAY", nameStr, (char *)NULL); return TCL_ERROR; } /* *---------------------------------------------------------------------- * * 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) == (Tcl_Size) !TclIsVarDeadHash(varPtr))) { if (VarHashRefCount(varPtr) == 0) { Tcl_Free(varPtr); } else { VarHashDeleteEntry(varPtr); } } if (arrayPtr != NULL && TclIsVarUndefined(arrayPtr) && TclIsVarInHash(arrayPtr) && !TclIsVarTraced(arrayPtr) && (VarHashRefCount(arrayPtr) == (Tcl_Size) !TclIsVarDeadHash(arrayPtr))) { if (VarHashRefCount(arrayPtr) == 0) { Tcl_Free(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. */ { Var *varPtr; Tcl_Obj *part1Ptr = Tcl_NewStringObj(part1, -1); if (createPart1) { 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 * or parsedVarNameType and caches as much of the lookup as it can. * When createPart1 is 1, callers must IncrRefCount part1Ptr if they * plan to DecrRefCount it. * *---------------------------------------------------------------------- */ Var * TclObjLookupVar( Tcl_Interp *interp, /* Interpreter to use for lookup. */ 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. */ 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 *part2Ptr = NULL; Var *resPtr; if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); if (createPart2) { Tcl_IncrRefCount(part2Ptr); } } resPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, msg, createPart1, createPart2, arrayPtrPtr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } return resPtr; } /* * When createPart1 is 1, callers must IncrRefCount part1Ptr if they * plan to DecrRefCount it. * When createPart2 is 1, callers must IncrRefCount part2Ptr if they * plan to DecrRefCount it. */ 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. */ 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. */ { Interp *iPtr = (Interp *) interp; CallFrame *varFramePtr = iPtr->varFramePtr; Var *varPtr; /* Points to the variable's in-frame Var * structure. */ const char *errMsg = NULL; int index, parsed = 0; Tcl_Size localIndex; Tcl_Obj *namePtr, *arrayPtr, *elem; *arrayPtrPtr = NULL; restart: LocalGetInternalRep(part1Ptr, localIndex, namePtr); if (localIndex >= 0) { if (HasLocalVars(varFramePtr) && !(flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)) && (localIndex < varFramePtr->numCompiledLocals)) { /* * Use the cached index if the names coincide. */ Tcl_Obj *checkNamePtr = localName(varFramePtr, localIndex); if ((!namePtr && (checkNamePtr == part1Ptr)) || (namePtr && (checkNamePtr == namePtr))) { varPtr = (Var *) &(varFramePtr->compiledLocals[localIndex]); goto donePart1; } } goto doneParsing; } /* * If part1Ptr is a parsedVarNameType, retrieve the preparsed parts. */ ParsedGetInternalRep(part1Ptr, parsed, arrayPtr, elem); if (parsed && arrayPtr) { 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); Tcl_SetErrorCode(interp, "TCL", "VALUE", "VARNAME", (char *)NULL); } return NULL; } part2Ptr = elem; part1Ptr = arrayPtr; goto restart; } if (!parsed) { /* * part1Ptr is possibly an unparsed array element. */ Tcl_Size len; const char *part1 = TclGetStringFromObj(part1Ptr, &len); if ((len > 1) && (part1[len - 1] == ')')) { const char *part2 = strchr(part1, '('); if (part2) { if (part2Ptr != NULL) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg, NEEDARRAY, -1); Tcl_SetErrorCode(interp, "TCL", "VALUE", "VARNAME", (char *)NULL); } return NULL; } arrayPtr = Tcl_NewStringObj(part1, (part2 - part1)); part2Ptr = Tcl_NewStringObj(part2 + 1, len - (part2 - part1) - 2); ParsedSetInternalRep(part1Ptr, arrayPtr, part2Ptr); part1Ptr = arrayPtr; } } } doneParsing: /* * part1Ptr is not an array element; look it up, and convert it to one of * the cached types if possible. */ 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); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", TclGetString(part1Ptr), (char *)NULL); } return NULL; } /* * Cache the newly found variable if possible. */ if (index >= 0) { /* * An indexed local variable. */ Tcl_Obj *cachedNamePtr = localName(varFramePtr, index); if (part1Ptr == cachedNamePtr) { LocalSetInternalRep(part1Ptr, index, NULL); } else { /* * [80304238ac] Trickiness here. We will store and incr the * refcount on cachedNamePtr. Trouble is that it's possible * (see test var-22.1) for cachedNamePtr to have an internalrep * that contains a stored and refcounted part1Ptr. This * would be a reference cycle which leads to a memory leak. * * The solution here is to wipe away all internalrep(s) in * cachedNamePtr and leave it as string only. This is * radical and destructive, so a better idea would be welcome. */ /* * Firstly set cached local var reference (avoid free before set, * see [45b9faf103f2]) */ LocalSetInternalRep(part1Ptr, index, cachedNamePtr); /* Then wipe it */ TclFreeInternalRep(cachedNamePtr); /* * Now go ahead and convert it the the "localVarName" type, * since we suspect at least some use of the value as a * varname and we want to resolve it quickly. */ LocalSetInternalRep(cachedNamePtr, index, NULL); } } else { /* * At least mark part1Ptr as already parsed. */ ParsedSetInternalRep(part1Ptr, NULL, NULL); } donePart1: 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); } return varPtr; } /* *---------------------------------------------------------------------- * * 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-cacheable 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. * Callers must Incr varNamePtr if they plan to Decr it 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, * TCL_AVOID_RESOLVERS and TCL_LEAVE_ERR_MSG * bits matter. */ 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, result; Tcl_Size i, varLen; const char *varName = TclGetStringFromObj(varNamePtr, &varLen); 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 & TCL_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[0] == ':') && (varName[1] == ':')); if (lookGlobal) { *indexPtr = -1; flags = (flags | TCL_GLOBAL_ONLY) & ~TCL_NAMESPACE_ONLY; } else { flags = (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 | TCL_AVOID_RESOLVERS) & ~TCL_LEAVE_ERR_MSG); if (varPtr == NULL) { Tcl_Obj *tailPtr; if (!create) { /* Var wasn't found and not to create it. */ *errMsgPtr = NOSUCHVAR; return NULL; } /* * 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 { /* Local var: look in frame varFramePtr. */ Tcl_Size localCt = varFramePtr->numCompiledLocals; if (localCt > 0) { Tcl_Obj **objPtrPtr = &varFramePtr->localCachePtr->varName0; const char *localNameStr; Tcl_Size localLen; for (i=0 ; icompiledLocals[i]; } } } } tablePtr = varFramePtr->varTablePtr; if (create) { if (tablePtr == NULL) { tablePtr = (TclVarHashTable *)Tcl_Alloc(sizeof(TclVarHashTable)); TclInitVarHashTable(tablePtr, NULL); tablePtr->arrayPtr = varPtr; 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. * When createElem is 1, callers must incr elNamePtr if they plan * to decr it. * *---------------------------------------------------------------------- */ 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. */ 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. */ 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. */ 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; /* * 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); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", arrayNamePtr?TclGetString(arrayNamePtr):NULL, (char *)NULL); } 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); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", arrayNamePtr?TclGetString(arrayNamePtr):NULL, (char *)NULL); } return NULL; } TclInitArrayVar(arrayPtr); } else if (!TclIsVarArray(arrayPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg, NEEDARRAY, index); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", arrayNamePtr?TclGetString(arrayNamePtr):NULL, (char *)NULL); } 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), (char *)NULL); } } } return varPtr; } /* *---------------------------------------------------------------------- * * 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 *resultPtr; Tcl_Obj *part2Ptr = NULL, *part1Ptr = Tcl_NewStringObj(part1, -1); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } resultPtr = Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags); Tcl_DecrRefCount(part1Ptr); if (part2Ptr) { Tcl_DecrRefCount(part2Ptr); } if (resultPtr == NULL) { return NULL; } return TclGetString(resultPtr); } /* *---------------------------------------------------------------------- * * 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 *resPtr, *part2Ptr = NULL, *part1Ptr = Tcl_NewStringObj(part1, -1); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } 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. * * Callers must incr part2Ptr if they plan to decr it. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_ObjGetVar2( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ 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. */ 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 TclPtrGetVarIdx(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. */ Tcl_Var varPtr, /* The variable to be read.*/ Tcl_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. */ int flags) /* OR-ed combination of TCL_GLOBAL_ONLY, and * TCL_LEAVE_ERR_MSG bits. */ { if (varPtr == NULL) { Tcl_Panic("varPtr must not be NULL"); } if (part1Ptr == NULL) { Tcl_Panic("part1Ptr must not be NULL"); } return TclPtrGetVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr, part1Ptr, part2Ptr, flags, -1); } /* *---------------------------------------------------------------------- * * TclPtrGetVarIdx -- * * 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 * TclPtrGetVarIdx( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ 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. */ 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; Var *initialArrayPtr = arrayPtr; TclVarFindHiddenArray(varPtr, arrayPtr); /* * 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; } /* * Return the array default value if any. */ if (arrayPtr && TclIsVarArray(arrayPtr) && TclGetArrayDefault(arrayPtr)) { return TclGetArrayDefault(arrayPtr); } if (TclIsVarArrayElement(varPtr) && !arrayPtr) { /* * UGLY! Peek inside the implementation of things. This lets us get * the default of an array even when we've been [upvar]ed to just an * element of the array. */ ArrayVarHashTable *avhtPtr = (ArrayVarHashTable *) ((VarInHash *) varPtr)->entry.tablePtr; if (avhtPtr->defaultObj) { return avhtPtr->defaultObj; } } if (flags & TCL_LEAVE_ERR_MSG) { if (TclIsVarUndefined(varPtr) && initialArrayPtr && !TclIsVarUndefined(initialArrayPtr)) { 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: Tcl_SetErrorCode(interp, "TCL", "READ", "VARNAME", (char *)NULL); 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. * *---------------------------------------------------------------------- */ int Tcl_SetObjCmd( TCL_UNUSED(void *), 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_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. */ { Tcl_Obj *varValuePtr = Tcl_SetVar2Ex(interp, part1, part2, Tcl_NewStringObj(newValue, -1), flags); 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 *resPtr, *part2Ptr = NULL, *part1Ptr = Tcl_NewStringObj(part1, -1); Tcl_IncrRefCount(part1Ptr); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); Tcl_IncrRefCount(part2Ptr); } 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. * Callers must Incr part1Ptr if they plan to Decr it. * Callers must Incr part2Ptr if they plan to Decr it. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_ObjSetVar2( 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 *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 TclPtrSetVarIdx(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. */ Tcl_Var varPtr, /* Reference to the variable to set. */ Tcl_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. */ Tcl_Obj *part2Ptr, /* If non-NULL, gives the name of an element * in the array part1. */ Tcl_Obj *newValuePtr, /* New value for variable. */ int flags) /* OR-ed combination of TCL_GLOBAL_ONLY, and * TCL_LEAVE_ERR_MSG bits. */ { if (varPtr == NULL) { Tcl_Panic("varPtr must not be NULL"); } if (part1Ptr == NULL) { Tcl_Panic("part1Ptr must not be NULL"); } if (newValuePtr == NULL) { Tcl_Panic("newValuePtr must not be NULL"); } return TclPtrSetVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr, part1Ptr, part2Ptr, newValuePtr, flags, -1); } /* *---------------------------------------------------------------------- * * ListAppendInVar, StringAppendInVar -- * * Support functions for TclPtrSetVarIdx that implement various types of * appending operations. * * Results: * ListAppendInVar returns a Tcl result code (from the core list append * operation). StringAppendInVar has no return value. * * Side effects: * The variable or element of the array is updated. This may make the * variable/element exist. Reference counts of values may be updated. * *---------------------------------------------------------------------- */ static inline int ListAppendInVar( Tcl_Interp *interp, Var *varPtr, Var *arrayPtr, Tcl_Obj *oldValuePtr, Tcl_Obj *newValuePtr) { if (oldValuePtr == NULL) { /* * No previous value. Check for defaults if there's an array we can * ask this of. */ if (arrayPtr) { Tcl_Obj *defValuePtr = TclGetArrayDefault(arrayPtr); if (defValuePtr) { oldValuePtr = Tcl_DuplicateObj(defValuePtr); } } if (oldValuePtr == NULL) { /* * No default. [lappend] semantics say this is like being an empty * string. */ 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. */ } return Tcl_ListObjAppendElement(interp, oldValuePtr, newValuePtr); } static inline void StringAppendInVar( Var *varPtr, Var *arrayPtr, Tcl_Obj *oldValuePtr, Tcl_Obj *newValuePtr) { /* * If there was no previous value, either we use the array's default (if * this is an array with a default at all) or we treat this as a simple * set. */ if (oldValuePtr == NULL) { if (arrayPtr) { Tcl_Obj *defValuePtr = TclGetArrayDefault(arrayPtr); if (defValuePtr) { /* * This is *almost* the same as the shared path below, except * that the original value reference in defValuePtr is not * decremented. */ Tcl_Obj *valuePtr = Tcl_DuplicateObj(defValuePtr); varPtr->value.objPtr = valuePtr; TclContinuationsCopy(valuePtr, defValuePtr); Tcl_IncrRefCount(valuePtr); Tcl_AppendObjToObj(valuePtr, newValuePtr); if (newValuePtr->refCount == 0) { Tcl_DecrRefCount(newValuePtr); } return; } } varPtr->value.objPtr = newValuePtr; Tcl_IncrRefCount(newValuePtr); return; } /* * We append newValuePtr's bytes but don't change its ref count. Unless * the reference is shared, when we have to duplicate in order to be safe * to modify at all. */ if (Tcl_IsShared(oldValuePtr)) { /* Append to copy. */ varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr); TclContinuationsCopy(varPtr->value.objPtr, oldValuePtr); TclDecrRefCount(oldValuePtr); oldValuePtr = varPtr->value.objPtr; Tcl_IncrRefCount(oldValuePtr); /* Since var is ref */ } Tcl_AppendObjToObj(oldValuePtr, newValuePtr); if (newValuePtr->refCount == 0) { Tcl_DecrRefCount(newValuePtr); } } /* *---------------------------------------------------------------------- * * TclPtrSetVarIdx -- * * 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 * TclPtrSetVarIdx( Tcl_Interp *interp, /* Command interpreter in which variable is to * be looked up. */ 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. */ 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; int cleanupOnEarlyError = (newValuePtr->refCount == 0); /* * 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); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ELEMENT", (char *)NULL); } else { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set", DANGLINGVAR, index); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", (char *)NULL); } } goto earlyError; } /* * It's an error to try to set a constant. */ if (TclIsVarConstant(varPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set", ISCONST,index); Tcl_SetErrorCode(interp, "TCL", "WRITE", "CONST", (void *)NULL); } 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); Tcl_SetErrorCode(interp, "TCL", "WRITE", "ARRAY", (char *)NULL); } goto earlyError; } TclVarFindHiddenArray(varPtr, arrayPtr); /* * Invoke any read traces that have been set for the variable if it is * requested. This was done for INST_LAPPEND_* but that was inconsistent * with the non-bc instruction, and would cause failures trying to * lappend to any non-existing ::env var, which is inconsistent with * documented behavior. [Bug #3057639]. */ 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 (flags & TCL_LIST_ELEMENT) { /* Append list element. */ result = ListAppendInVar(interp, varPtr, arrayPtr, oldValuePtr, newValuePtr); if (result != TCL_OK) { goto earlyError; } } else { /* Append string. */ StringAppendInVar(varPtr, arrayPtr, 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 (resultPtr == NULL) { Tcl_SetErrorCode(interp, "TCL", "WRITE", "VARNAME", (char *)NULL); } if (TclIsVarUndefined(varPtr)) { TclCleanupVar(varPtr, arrayPtr); } return resultPtr; earlyError: if (cleanupOnEarlyError) { 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. * Callers must Incr part1Ptr if they plan to Decr it. * Callers must Incr part2Ptr if they plan to Decr it. * *---------------------------------------------------------------------- */ 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_AddErrorInfo(interp, "\n (reading value of variable to increment)"); return NULL; } return TclPtrIncrObjVarIdx(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. */ Tcl_Var varPtr, /* Reference to the variable to set. */ Tcl_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? */ 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. */ { if (varPtr == NULL) { Tcl_Panic("varPtr must not be NULL"); } if (part1Ptr == NULL) { Tcl_Panic("part1Ptr must not be NULL"); } return TclPtrIncrObjVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr, part1Ptr, part2Ptr, incrPtr, flags, -1); } /* *---------------------------------------------------------------------- * * TclPtrIncrObjVarIdx -- * * 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 * TclPtrIncrObjVarIdx( 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? */ 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. */ { Tcl_Obj *varValuePtr; /* * It's an error to try to increment a constant. */ if (TclIsVarConstant(varPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "incr", ISCONST,index); Tcl_SetErrorCode(interp, "TCL", "WRITE", "CONST", (void *)NULL); } return NULL; } if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)++; } varValuePtr = TclPtrGetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, flags, index); if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)--; } if (varValuePtr == NULL) { TclNewIntObj(varValuePtr, 0); } if (Tcl_IsShared(varValuePtr)) { /* Copy on write */ varValuePtr = Tcl_DuplicateObj(varValuePtr); if (TCL_OK == TclIncrObj(interp, varValuePtr, incrPtr)) { return TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, varValuePtr, flags, index); } else { Tcl_DecrRefCount(varValuePtr); return NULL; } } else { /* Unshared - can Incr in place */ if (TCL_OK == TclIncrObj(interp, varValuePtr, incrPtr)) { /* * This seems dumb to write the incremeted value into the var * after we just adjusted the value in place, but the spec for * [incr] requires that write traces fire, and making this call * is the way to make that happen. */ return TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, varValuePtr, flags, index); } else { return NULL; } } } /* *---------------------------------------------------------------------- * * 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 *part2Ptr = NULL, *part1Ptr = Tcl_NewStringObj(part1, -1); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); } /* * 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, *arrayPtr; varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "unset", /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } return TclPtrUnsetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, flags, -1); } /* *---------------------------------------------------------------------- * * TclPtrUnsetVar -- * * Delete a variable, given the pointers to the variable's (and possibly * containing array's) VAR structure. * * 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 varPtr and arrayPtr indicate a local or global variable in interp, * it is deleted. If varPtr is an array reference and part2Ptr is NULL, * then the whole array is deleted. * *---------------------------------------------------------------------- */ int TclPtrUnsetVar( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ Tcl_Var varPtr, /* The variable to be unset. */ Tcl_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. */ int flags) /* OR-ed combination of any of * TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_LEAVE_ERR_MSG. */ { if (varPtr == NULL) { Tcl_Panic("varPtr must not be NULL"); } if (part1Ptr == NULL) { Tcl_Panic("part1Ptr must not be NULL"); } return TclPtrUnsetVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr, part1Ptr, part2Ptr, flags, -1); } /* *---------------------------------------------------------------------- * * TclPtrUnsetVarIdx -- * * Delete a variable, given the pointers to the variable's (and possibly * containing array's) VAR structure. * * 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 varPtr and arrayPtr indicate a local or global variable in interp, * it is deleted. If varPtr is an array reference and part2Ptr is NULL, * then the whole array is deleted. * *---------------------------------------------------------------------- */ int TclPtrUnsetVarIdx( Tcl_Interp *interp, /* Command interpreter in which varName is to * be looked up. */ Var *varPtr, /* The variable to be unset. */ 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. */ int flags, /* OR-ed combination of any of * TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY, * TCL_LEAVE_ERR_MSG. */ int index) /* Index into the local variable table of the * variable, or -1. Only used when part1Ptr is * NULL. */ { Interp *iPtr = (Interp *) interp; int result = (TclIsVarUndefined(varPtr)? TCL_ERROR : TCL_OK); Var *initialArrayPtr = arrayPtr; /* * It's an error to try to unset a constant. */ if (TclIsVarConstant(varPtr)) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "unset", ISCONST,index); Tcl_SetErrorCode(interp, "TCL", "UNSET", "CONST", (void *)NULL); } return TCL_ERROR; } /* * 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)++; } TclVarFindHiddenArray(varPtr, arrayPtr); UnsetVarStruct(varPtr, arrayPtr, iPtr, part1Ptr, part2Ptr, flags, index); /* * It's an error to unset an undefined variable. */ if (result != TCL_OK) { if (flags & TCL_LEAVE_ERR_MSG) { TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "unset", ((initialArrayPtr == NULL) ? NOSUCHVAR : NOSUCHELEMENT), index); Tcl_SetErrorCode(interp, "TCL", "UNSET", "VARNAME", (char *)NULL); } } /* * 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, int index) { 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; if (TclIsVarTraced(&dummyVar)) { /* * Transfer any existing traces on var, IF there are unset traces. * Otherwise just delete them. */ int isNew; tPtr = Tcl_FindHashEntry(&iPtr->varTraces, varPtr); tracePtr = (VarTrace *)Tcl_GetHashValue(tPtr); varPtr->flags &= ~VAR_ALL_TRACES; Tcl_DeleteHashEntry(tPtr); if (dummyVar.flags & VAR_TRACED_UNSET) { tPtr = Tcl_CreateHashEntry(&iPtr->varTraces, &dummyVar, &isNew); Tcl_SetHashValue(tPtr, tracePtr); } } if ((dummyVar.flags & VAR_TRACED_UNSET) || (arrayPtr && (arrayPtr->flags & VAR_TRACED_UNSET))) { /* * Pass the array element name to TclObjCallVarTraces(), because * it cannot be determined from dummyVar. Alternatively, indicate * via flags whether the variable involved in the code that caused * the trace to be triggered was an array element, for the correct * formatting of error messages. */ if (part2Ptr) { flags |= VAR_ARRAY_ELEMENT; } else if (TclIsVarArrayElement(varPtr)) { part2Ptr = VarHashGetKey(varPtr); } dummyVar.flags &= ~VAR_TRACE_ACTIVE; TclObjCallVarTraces(iPtr, arrayPtr, &dummyVar, part1Ptr, part2Ptr, (flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|VAR_ARRAY_ELEMENT)) | TCL_TRACE_UNSETS, /* leaveErrMsg */ 0, index); /* * The traces that we just called may have triggered a change in * the set of traces. If so, reload the traces to manipulate. */ tracePtr = NULL; if (TclIsVarTraced(&dummyVar)) { tPtr = Tcl_FindHashEntry(&iPtr->varTraces, &dummyVar); if (tPtr) { tracePtr = (VarTrace *)Tcl_GetHashValue(tPtr); Tcl_DeleteHashEntry(tPtr); } } } if (tracePtr) { ActiveVarTrace *activePtr; while (tracePtr) { VarTrace *prevPtr = tracePtr; tracePtr = tracePtr->nextPtr; prevPtr->nextPtr = NULL; Tcl_EventuallyFree(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, index); } 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. * *---------------------------------------------------------------------- */ int Tcl_UnsetObjCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { int i, flags = TCL_LEAVE_ERR_MSG; const 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. * *---------------------------------------------------------------------- */ int Tcl_AppendObjCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Var *varPtr, *arrayPtr; Tcl_Obj *varValuePtr = NULL; /* Initialized to avoid compiler warning. */ int i; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "varName ?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 ; iemptyObjPtr)) { 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. * *---------------------------------------------------------------------- */ int Tcl_LappendObjCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Tcl_Obj *varValuePtr, *newValuePtr; Tcl_Size numElems; Var *varPtr, *arrayPtr; int result, createdNewObj; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "varName ?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 TclPtrGetVarIdx 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 = TclPtrGetVarIdx(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 = TclPtrSetVarIdx(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; } /* *---------------------------------------------------------------------- * * ArrayForObjCmd, ArrayForNRCmd, ArrayForLoopCallback, ArrayObjNext -- * * These functions implement the "array for" Tcl command. * array for {k v} a {} * The array for command iterates over the array, setting the the * specified loop variables, and executing the body each iteration. * * ArrayForObjCmd() is the standard wrapper around ArrayForNRCmd(). * * ArrayForNRCmd() sets up the ArraySearch structure, sets arrayNamePtr * inside the structure and calls VarHashFirstEntry to start the hash * iteration. * * ArrayForNRCmd() does not execute the body or set the loop variables, * it only initializes the iterator. * * ArrayForLoopCallback() iterates over the entire array, executing the * body each time. * *---------------------------------------------------------------------- */ static int ArrayObjNext( Tcl_Interp *interp, Tcl_Obj *arrayNameObj, /* array */ Var *varPtr, /* array */ ArraySearch *searchPtr, Tcl_Obj **keyPtrPtr, /* Pointer to a variable to have the key * written into, or NULL. */ Tcl_Obj **valuePtrPtr) /* Pointer to a variable to have the * value written into, or NULL.*/ { Tcl_Obj *keyObj; Tcl_Obj *valueObj = NULL; int gotValue; int donerc; donerc = TCL_BREAK; if ((varPtr->flags & VAR_SEARCH_ACTIVE) != VAR_SEARCH_ACTIVE) { donerc = TCL_ERROR; return donerc; } gotValue = 0; while (1) { Tcl_HashEntry *hPtr = searchPtr->nextEntry; if (hPtr != NULL) { searchPtr->nextEntry = NULL; } else { hPtr = Tcl_NextHashEntry(&searchPtr->search); if (hPtr == NULL) { gotValue = 0; break; } } varPtr = VarHashGetValue(hPtr); if (!TclIsVarUndefined(varPtr)) { gotValue = 1; break; } } if (!gotValue) { return donerc; } donerc = TCL_CONTINUE; keyObj = VarHashGetKey(varPtr); *keyPtrPtr = keyObj; valueObj = Tcl_ObjGetVar2(interp, arrayNameObj, keyObj, TCL_LEAVE_ERR_MSG); *valuePtrPtr = valueObj; return donerc; } static int ArrayForObjCmd( void *clientData, Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { return Tcl_NRCallObjProc(interp, ArrayForNRCmd, clientData, objc, objv); } static int ArrayForNRCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const *objv) { Tcl_Obj *varListObj, *arrayNameObj, *scriptObj; ArraySearch *searchPtr = NULL; Var *varPtr; int isArray; Tcl_Size numVars; /* * array for {k v} a body */ if (objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "{key value} arrayName script"); return TCL_ERROR; } /* * Parse arguments. */ if (TclListObjLength(interp, objv[1], &numVars) != TCL_OK) { return TCL_ERROR; } if (numVars != 2) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "must have two variable names", -1)); Tcl_SetErrorCode(interp, "TCL", "SYNTAX", "array", "for", (char *)NULL); return TCL_ERROR; } arrayNameObj = objv[2]; if (TCL_ERROR == LocateArray(interp, arrayNameObj, &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return NotArrayError(interp, arrayNameObj); } /* * Make a new array search, put it on the stack. */ searchPtr = (ArraySearch *)Tcl_Alloc(sizeof(ArraySearch)); ArrayPopulateSearch(interp, arrayNameObj, varPtr, searchPtr); /* * Make sure that these objects (which we need throughout the body of the * loop) don't vanish. */ varListObj = TclListObjCopy(NULL, objv[1]); if (!varListObj) { return TCL_ERROR; } scriptObj = objv[3]; Tcl_IncrRefCount(scriptObj); /* * Run the script. */ TclNRAddCallback(interp, ArrayForLoopCallback, searchPtr, varListObj, arrayNameObj, scriptObj); return TCL_OK; } static int ArrayForLoopCallback( void *data[], Tcl_Interp *interp, int result) { Interp *iPtr = (Interp *) interp; ArraySearch *searchPtr = (ArraySearch *)data[0]; Tcl_Obj *varListObj = (Tcl_Obj *)data[1]; Tcl_Obj *arrayNameObj = (Tcl_Obj *)data[2]; Tcl_Obj *scriptObj = (Tcl_Obj *)data[3]; Tcl_Obj **varv; Tcl_Obj *keyObj, *valueObj; Var *varPtr; Var *arrayPtr; int done; Tcl_Size varc; /* * Process the result from the previous execution of the script body. */ done = TCL_ERROR; if (result == TCL_CONTINUE) { result = TCL_OK; } else if (result != TCL_OK) { if (result == TCL_BREAK) { Tcl_ResetResult(interp); result = TCL_OK; } else if (result == TCL_ERROR) { Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf( "\n (\"array for\" body line %d)", Tcl_GetErrorLine(interp))); } goto arrayfordone; } /* * Get the next mapping from the array. */ keyObj = NULL; valueObj = NULL; varPtr = TclObjLookupVarEx(interp, arrayNameObj, NULL, /*flags*/ 0, /*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr); if (varPtr == NULL) { done = TCL_ERROR; } else { done = ArrayObjNext(interp, arrayNameObj, varPtr, searchPtr, &keyObj, &valueObj); } result = TCL_OK; if (done != TCL_CONTINUE) { Tcl_ResetResult(interp); if (done == TCL_ERROR) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "array changed during iteration", -1)); Tcl_SetErrorCode(interp, "TCL", "READ", "array", "for", (char *)NULL); varPtr->flags |= TCL_LEAVE_ERR_MSG; result = done; } goto arrayfordone; } result = TclListObjGetElements(NULL, varListObj, &varc, &varv); if (result != TCL_OK) { goto arrayfordone; } if (Tcl_ObjSetVar2(interp, varv[0], NULL, keyObj, TCL_LEAVE_ERR_MSG) == NULL) { result = TCL_ERROR; goto arrayfordone; } if (valueObj != NULL) { if (Tcl_ObjSetVar2(interp, varv[1], NULL, valueObj, TCL_LEAVE_ERR_MSG) == NULL) { result = TCL_ERROR; goto arrayfordone; } } /* * Run the script. */ TclNRAddCallback(interp, ArrayForLoopCallback, searchPtr, varListObj, arrayNameObj, scriptObj); return TclNREvalObjEx(interp, scriptObj, 0, iPtr->cmdFramePtr, 3); /* * For unwinding everything once the iterating is done. */ arrayfordone: if (done != TCL_ERROR) { /* * If the search was terminated by an array change, the * VAR_SEARCH_ACTIVE flag will no longer be set. */ ArrayDoneSearch(iPtr, varPtr, searchPtr); Tcl_DecrRefCount(searchPtr->name); Tcl_Free(searchPtr); } TclDecrRefCount(varListObj); TclDecrRefCount(scriptObj); return result; } /* * ArrayPopulateSearch */ static void ArrayPopulateSearch( Tcl_Interp *interp, Tcl_Obj *arrayNameObj, Var *varPtr, ArraySearch *searchPtr) { Interp *iPtr = (Interp *) interp; Tcl_HashEntry *hPtr; int isNew; hPtr = Tcl_CreateHashEntry(&iPtr->varSearches, varPtr, &isNew); if (isNew) { searchPtr->id = 1; varPtr->flags |= VAR_SEARCH_ACTIVE; searchPtr->nextPtr = NULL; } else { searchPtr->id = ((ArraySearch *) Tcl_GetHashValue(hPtr))->id + 1; searchPtr->nextPtr = (ArraySearch *)Tcl_GetHashValue(hPtr); } searchPtr->varPtr = varPtr; searchPtr->nextEntry = VarHashFirstEntry(varPtr->value.tablePtr, &searchPtr->search); Tcl_SetHashValue(hPtr, searchPtr); searchPtr->name = Tcl_ObjPrintf("s-%d-%s", searchPtr->id, TclGetString(arrayNameObj)); Tcl_IncrRefCount(searchPtr->name); } /* *---------------------------------------------------------------------- * * ArrayStartSearchCmd -- * * This object-based function is invoked to process the "array * startsearch" Tcl command. See the user documentation for details on * what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayStartSearchCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Var *varPtr; int isArray; ArraySearch *searchPtr; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName"); return TCL_ERROR; } if (TCL_ERROR == LocateArray(interp, objv[1], &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return NotArrayError(interp, objv[1]); } /* * Make a new array search with a free name. */ searchPtr = (ArraySearch *)Tcl_Alloc(sizeof(ArraySearch)); ArrayPopulateSearch(interp, objv[1], varPtr, searchPtr); Tcl_SetObjResult(interp, searchPtr->name); return TCL_OK; } /* *---------------------------------------------------------------------- * * ArrayDoneSearch -- * * Removes the search from the hash of active searches. * *---------------------------------------------------------------------- */ static void ArrayDoneSearch( Interp *iPtr, Var *varPtr, ArraySearch *searchPtr) { Tcl_HashEntry *hPtr; ArraySearch *prevPtr; /* * Unhook the search from the list of searches associated with the * variable. */ hPtr = Tcl_FindHashEntry(&iPtr->varSearches, varPtr); if (hPtr == NULL) { return; } 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 = (ArraySearch *)Tcl_GetHashValue(hPtr); ; prevPtr=prevPtr->nextPtr) { if (prevPtr->nextPtr == searchPtr) { prevPtr->nextPtr = searchPtr->nextPtr; break; } } } } /* *---------------------------------------------------------------------- * * ArrayAnyMoreCmd -- * * This object-based function is invoked to process the "array anymore" * Tcl command. See the user documentation for details on what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayAnyMoreCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Interp *iPtr = (Interp *) interp; Var *varPtr; Tcl_Obj *varNameObj, *searchObj; int gotValue, isArray; ArraySearch *searchPtr; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName searchId"); return TCL_ERROR; } varNameObj = objv[1]; searchObj = objv[2]; if (TCL_ERROR == LocateArray(interp, varNameObj, &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return NotArrayError(interp, varNameObj); } /* * Get the search. */ searchPtr = ParseSearchId(interp, varPtr, varNameObj, searchObj); if (searchPtr == NULL) { return TCL_ERROR; } /* * Scan forward to find if there are any further elements in the array * that are defined. */ while (1) { if (searchPtr->nextEntry != NULL) { varPtr = VarHashGetValue(searchPtr->nextEntry); if (!TclIsVarUndefined(varPtr)) { gotValue = 1; break; } } searchPtr->nextEntry = Tcl_NextHashEntry(&searchPtr->search); if (searchPtr->nextEntry == NULL) { gotValue = 0; break; } } Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[gotValue]); return TCL_OK; } /* *---------------------------------------------------------------------- * * ArrayNextElementCmd -- * * This object-based function is invoked to process the "array * nextelement" Tcl command. See the user documentation for details on * what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayNextElementCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Var *varPtr; Tcl_Obj *varNameObj, *searchObj; ArraySearch *searchPtr; int isArray; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName searchId"); return TCL_ERROR; } varNameObj = objv[1]; searchObj = objv[2]; if (TCL_ERROR == LocateArray(interp, varNameObj, &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return NotArrayError(interp, varNameObj); } /* * Get the search. */ searchPtr = ParseSearchId(interp, varPtr, varNameObj, searchObj); if (searchPtr == NULL) { return TCL_ERROR; } /* * Get the next element from the search, or the empty string on * exhaustion. Note that the [array anymore] command may well have already * pulled a value from the hash enumeration, so we have to check the cache * there first. */ while (1) { Tcl_HashEntry *hPtr = searchPtr->nextEntry; if (hPtr == NULL) { hPtr = Tcl_NextHashEntry(&searchPtr->search); if (hPtr == NULL) { return TCL_OK; } } else { searchPtr->nextEntry = NULL; } varPtr = VarHashGetValue(hPtr); if (!TclIsVarUndefined(varPtr)) { Tcl_SetObjResult(interp, VarHashGetKey(varPtr)); return TCL_OK; } } } /* *---------------------------------------------------------------------- * * ArrayDoneSearchCmd -- * * This object-based function is invoked to process the "array * donesearch" Tcl command. See the user documentation for details on * what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayDoneSearchCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Interp *iPtr = (Interp *) interp; Var *varPtr; Tcl_Obj *varNameObj, *searchObj; ArraySearch *searchPtr; int isArray; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName searchId"); return TCL_ERROR; } varNameObj = objv[1]; searchObj = objv[2]; if (TCL_ERROR == LocateArray(interp, varNameObj, &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return NotArrayError(interp, varNameObj); } /* * Get the search. */ searchPtr = ParseSearchId(interp, varPtr, varNameObj, searchObj); if (searchPtr == NULL) { return TCL_ERROR; } ArrayDoneSearch(iPtr, varPtr, searchPtr); Tcl_DecrRefCount(searchPtr->name); Tcl_Free(searchPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * ArrayExistsCmd -- * * This object-based function is invoked to process the "array exists" * Tcl command. See the user documentation for details on what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayExistsCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Interp *iPtr = (Interp *)interp; int isArray; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName"); return TCL_ERROR; } if (TCL_ERROR == LocateArray(interp, objv[1], NULL, &isArray)) { return TCL_ERROR; } Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[isArray]); return TCL_OK; } /* *---------------------------------------------------------------------- * * ArrayGetCmd -- * * This object-based function is invoked to process the "array get" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayGetCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Var *varPtr, *varPtr2; Tcl_Obj *varNameObj, *nameObj, *valueObj, *nameLstObj, *tmpResObj; Tcl_Obj **nameObjPtr, *patternObj; Tcl_HashSearch search; const char *pattern; Tcl_Size i, count; int result, isArray; switch (objc) { case 2: varNameObj = objv[1]; patternObj = NULL; break; case 3: varNameObj = objv[1]; patternObj = objv[2]; break; default: Tcl_WrongNumArgs(interp, 1, objv, "arrayName ?pattern?"); return TCL_ERROR; } if (TCL_ERROR == LocateArray(interp, varNameObj, &varPtr, &isArray)) { return TCL_ERROR; } /* If not an array, it's an empty result. */ if (!isArray) { return TCL_OK; } pattern = (patternObj ? TclGetString(patternObj) : NULL); /* * Store the array names in a new object. */ TclNewObj(nameLstObj); Tcl_IncrRefCount(nameLstObj); if ((patternObj != NULL) && TclMatchIsTrivial(pattern)) { varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternObj); if (varPtr2 == NULL) { goto searchDone; } if (TclIsVarUndefined(varPtr2)) { goto searchDone; } result = Tcl_ListObjAppendElement(interp, nameLstObj, VarHashGetKey(varPtr2)); if (result != TCL_OK) { TclDecrRefCount(nameLstObj); return result; } goto searchDone; } for (varPtr2 = VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2; varPtr2 = VarHashNextVar(&search)) { if (TclIsVarUndefined(varPtr2)) { continue; } nameObj = VarHashGetKey(varPtr2); if (patternObj && !Tcl_StringMatch(TclGetString(nameObj), pattern)) { continue; /* Element name doesn't match pattern. */ } result = Tcl_ListObjAppendElement(interp, nameLstObj, nameObj); if (result != TCL_OK) { TclDecrRefCount(nameLstObj); return result; } } /* * Make sure the Var structure of the array is not removed by a trace * while we're working. */ searchDone: if (TclIsVarInHash(varPtr)) { VarHashRefCount(varPtr)++; } /* * Get the array values corresponding to each element name. */ TclNewObj(tmpResObj); result = TclListObjGetElements(interp, nameLstObj, &count, &nameObjPtr); if (result != TCL_OK) { goto errorInArrayGet; } for (i=0 ; i 4)) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName ?mode? ?pattern?"); return TCL_ERROR; } patternObj = (objc > 2 ? objv[objc-1] : NULL); if (TCL_ERROR == LocateArray(interp, objv[1], &varPtr, &isArray)) { return TCL_ERROR; } /* * Finish parsing the arguments. */ if ((objc == 4) && Tcl_GetIndexFromObj(interp, objv[2], options, "option", 0, &mode) != TCL_OK) { return TCL_ERROR; } /* If not an array, the result is empty. */ if (!isArray) { return TCL_OK; } /* * Check for the trivial cases where we can use a direct lookup. */ TclNewObj(resultObj); if (patternObj) { pattern = TclGetString(patternObj); } if ((mode==OPT_GLOB && patternObj && TclMatchIsTrivial(pattern)) || (mode==OPT_EXACT)) { varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternObj); if ((varPtr2 != NULL) && !TclIsVarUndefined(varPtr2)) { /* * This can't fail; lappending to an empty object always works. */ Tcl_ListObjAppendElement(NULL, resultObj, VarHashGetKey(varPtr2)); } Tcl_SetObjResult(interp, resultObj); return TCL_OK; } /* * Must scan the array to select the elements. */ for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) { if (TclIsVarUndefined(varPtr2)) { continue; } nameObj = VarHashGetKey(varPtr2); if (patternObj) { const char *name = TclGetString(nameObj); int matched = 0; switch (mode) { case OPT_EXACT: Tcl_Panic("exact matching shouldn't get here"); case OPT_GLOB: matched = Tcl_StringMatch(name, pattern); break; case OPT_REGEXP: matched = Tcl_RegExpMatchObj(interp, nameObj, patternObj); if (matched < 0) { TclDecrRefCount(resultObj); return TCL_ERROR; } break; } if (matched == 0) { continue; } } Tcl_ListObjAppendElement(NULL, resultObj, nameObj); } Tcl_SetObjResult(interp, resultObj); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclFindArrayPtrElements -- * * Fill out a hash table (which *must* use Tcl_Obj* keys) with an entry * for each existing element of the given array. The provided hash table * is assumed to be initially empty. * * Result: * none * * Side effects: * The keys of the array gain an extra reference. The supplied hash table * has elements added to it. * *---------------------------------------------------------------------- */ void TclFindArrayPtrElements( Var *arrayPtr, Tcl_HashTable *tablePtr) { Var *varPtr; Tcl_HashSearch search; if ((arrayPtr == NULL) || !TclIsVarArray(arrayPtr) || TclIsVarUndefined(arrayPtr)) { return; } for (varPtr=VarHashFirstVar(arrayPtr->value.tablePtr, &search); varPtr!=NULL ; varPtr=VarHashNextVar(&search)) { Tcl_HashEntry *hPtr; Tcl_Obj *nameObj; int dummy; if (TclIsVarUndefined(varPtr)) { continue; } nameObj = VarHashGetKey(varPtr); hPtr = Tcl_CreateHashEntry(tablePtr, nameObj, &dummy); Tcl_SetHashValue(hPtr, nameObj); } } /* *---------------------------------------------------------------------- * * ArraySetCmd -- * * This object-based function is invoked to process the "array set" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArraySetCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Tcl_Obj *arrayNameObj; Tcl_Obj *arrayElemObj; Var *varPtr, *arrayPtr; int result; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName list"); return TCL_ERROR; } if (TCL_ERROR == LocateArray(interp, objv[1], NULL, NULL)) { return TCL_ERROR; } arrayNameObj = objv[1]; 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); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", TclGetString(arrayNameObj), (char *)NULL); return TCL_ERROR; } /* * Install the contents of the dictionary or list into the array. */ arrayElemObj = objv[2]; if (TclHasInternalRep(arrayElemObj, &tclDictType) && arrayElemObj->bytes == NULL) { Tcl_Obj *keyPtr, *valuePtr; Tcl_DictSearch search; int done; Tcl_Size size; if (Tcl_DictObjSize(interp, arrayElemObj, &size) != TCL_OK) { return TCL_ERROR; } if (size == 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) || (TclPtrSetVarIdx(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- * -compatibility reasons) a list. */ Tcl_Size elemLen; Tcl_Obj **elemPtrs, *copyListObj; Tcl_Size i; result = TclListObjLength(interp, arrayElemObj, &elemLen); if (result != TCL_OK) { return result; } if (elemLen & 1) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "list must have an even number of elements", -1)); Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "FORMAT", (char *)NULL); return TCL_ERROR; } if (elemLen == 0) { goto ensureArray; } result = TclListObjGetElements(interp, arrayElemObj, &elemLen, &elemPtrs); if (result != TCL_OK) { return result; } /* * We needn't worry about traces invalidating arrayPtr: should that be * the case, TclPtrSetVarIdx will return NULL so that we break out of * the loop and return an error. */ copyListObj = TclListObjCopy(NULL, arrayElemObj); if (!copyListObj) { return TCL_ERROR; } for (i=0 ; ivalue.tablePtr, &search); varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) { if (!TclIsVarUndefined(varPtr2)) { size++; } } } Tcl_SetObjResult(interp, Tcl_NewWideIntObj(size)); return TCL_OK; } /* *---------------------------------------------------------------------- * * ArrayStatsCmd -- * * This object-based function is invoked to process the "array * statistics" Tcl command. See the user documentation for details on * what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayStatsCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Var *varPtr; Tcl_Obj *varNameObj; char *stats; int isArray; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "arrayName"); return TCL_ERROR; } varNameObj = objv[1]; if (TCL_ERROR == LocateArray(interp, varNameObj, &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return NotArrayError(interp, varNameObj); } stats = Tcl_HashStats((Tcl_HashTable *) varPtr->value.tablePtr); if (stats == NULL) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "error reading array statistics", -1)); return TCL_ERROR; } Tcl_SetObjResult(interp, Tcl_NewStringObj(stats, -1)); Tcl_Free(stats); return TCL_OK; } /* *---------------------------------------------------------------------- * * ArrayUnsetCmd -- * * This object-based function is invoked to process the "array unset" Tcl * command. See the user documentation for details on what it does. * * Results: * A standard Tcl result object. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayUnsetCmd( TCL_UNUSED(void *), Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) { Var *varPtr, *varPtr2, *protectedVarPtr; Tcl_Obj *varNameObj, *patternObj, *nameObj; Tcl_HashSearch search; const char *pattern; int unsetFlags = 0; /* Should this be TCL_LEAVE_ERR_MSG? */ int isArray; switch (objc) { case 2: varNameObj = objv[1]; patternObj = NULL; break; case 3: varNameObj = objv[1]; patternObj = objv[2]; break; default: Tcl_WrongNumArgs(interp, 1, objv, "arrayName ?pattern?"); return TCL_ERROR; } if (TCL_ERROR == LocateArray(interp, varNameObj, &varPtr, &isArray)) { return TCL_ERROR; } if (!isArray) { return TCL_OK; } if (!patternObj) { /* * When no pattern is given, just unset the whole array. */ return TclObjUnsetVar2(interp, varNameObj, NULL, 0); } /* * With a trivial pattern, we can just unset. */ pattern = TclGetString(patternObj); if (TclMatchIsTrivial(pattern)) { varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternObj); if (!varPtr2 || TclIsVarUndefined(varPtr2)) { return TCL_OK; } return TclPtrUnsetVarIdx(interp, varPtr2, varPtr, varNameObj, patternObj, unsetFlags, -1); } /* * Non-trivial case (well, deeply tricky really). We peek inside the hash * iterator in order to allow us to guarantee that the following element * in the array will not be scrubbed until we have dealt with it. This * stops the overall iterator from ending up pointing into deallocated * memory. [Bug 2939073] */ protectedVarPtr = NULL; for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search); varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) { /* * Drop the extra ref immediately. We don't need to free it at this * point though; we'll be unsetting it if necessary soon. */ if (varPtr2 == protectedVarPtr) { VarHashRefCount(varPtr2)--; } /* * Guard the next (peeked) item in the search chain by incrementing * its refcount. This guarantees that the hash table iterator won't be * dangling on the next time through the loop. */ if (search.nextEntryPtr != NULL) { protectedVarPtr = VarHashGetValue(search.nextEntryPtr); VarHashRefCount(protectedVarPtr)++; } else { protectedVarPtr = NULL; } /* * If the variable is undefined, clean it out as it has been hit by * something else (i.e., an unset trace). */ if (TclIsVarUndefined(varPtr2)) { CleanupVar(varPtr2, varPtr); continue; } nameObj = VarHashGetKey(varPtr2); if (Tcl_StringMatch(TclGetString(nameObj), pattern) && TclPtrUnsetVarIdx(interp, varPtr2, varPtr, varNameObj, nameObj, unsetFlags, -1) != TCL_OK) { /* * If we incremented a refcount, we must decrement it here as we * will not be coming back properly due to the error. */ if (protectedVarPtr) { VarHashRefCount(protectedVarPtr)--; CleanupVar(protectedVarPtr, varPtr); } return TCL_ERROR; } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclInitArrayCmd -- * * This creates the ensemble for the "array" command. * * Results: * The handle for the created ensemble. * * Side effects: * Creates a command in the global namespace. * *---------------------------------------------------------------------- */ Tcl_Command TclInitArrayCmd( Tcl_Interp *interp) /* Current interpreter. */ { static const EnsembleImplMap arrayImplMap[] = { {"anymore", ArrayAnyMoreCmd, TclCompileBasic2ArgCmd, NULL, NULL, 0}, {"default", ArrayDefaultCmd, TclCompileBasic2Or3ArgCmd, NULL, NULL, 0}, {"donesearch", ArrayDoneSearchCmd, TclCompileBasic2ArgCmd, NULL, NULL, 0}, {"exists", ArrayExistsCmd, TclCompileArrayExistsCmd, NULL, NULL, 0}, {"for", ArrayForObjCmd, TclCompileBasic3ArgCmd, ArrayForNRCmd, NULL, 0}, {"get", ArrayGetCmd, TclCompileBasic1Or2ArgCmd, NULL, NULL, 0}, {"names", ArrayNamesCmd, TclCompileBasic1To3ArgCmd, NULL, NULL, 0}, {"nextelement", ArrayNextElementCmd, TclCompileBasic2ArgCmd, NULL, NULL, 0}, {"set", ArraySetCmd, TclCompileArraySetCmd, NULL, NULL, 0}, {"size", ArraySizeCmd, TclCompileBasic1ArgCmd, NULL, NULL, 0}, {"startsearch", ArrayStartSearchCmd, TclCompileBasic1ArgCmd, NULL, NULL, 0}, {"statistics", ArrayStatsCmd, TclCompileBasic1ArgCmd, NULL, NULL, 0}, {"unset", ArrayUnsetCmd, TclCompileArrayUnsetCmd, NULL, NULL, 0}, {NULL, NULL, NULL, NULL, NULL, 0} }; return TclMakeEnsemble(interp, "array", arrayImplMap); } /* *---------------------------------------------------------------------- * * 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 interp. * * 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. * Callers must Incr myNamePtr if they plan to Decr it. * Callers must Incr otherP1Ptr if they plan to Decr it. * *---------------------------------------------------------------------- */ 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. */ 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_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf( "bad variable name \"%s\": can't create namespace " "variable that refers to procedure variable", TclGetString(myNamePtr))); Tcl_SetErrorCode(interp, "TCL", "UPVAR", "INVERTED", (char *)NULL); return TCL_ERROR; } } return TclPtrObjMakeUpvarIdx(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 interp. * * 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 = NULL; int result; if (myName) { myNamePtr = Tcl_NewStringObj(myName, -1); Tcl_IncrRefCount(myNamePtr); } result = TclPtrObjMakeUpvarIdx(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. */ Tcl_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. */ { return TclPtrObjMakeUpvarIdx(interp, (Var *) otherPtr, myNamePtr, myFlags, -1); } /* Callers must Incr myNamePtr if they plan to Decr it. */ int TclPtrObjMakeUpvarIdx( 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_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf( "bad variable name \"%s\": can't create a scalar " "variable that looks like an array element", myName)); Tcl_SetErrorCode(interp, "TCL", "UPVAR", "LOCAL_ELEMENT", (char *)NULL); return TCL_ERROR; } } /* * Lookup and eventually create the new variable. Set the flag bit * TCL_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|TCL_AVOID_RESOLVERS, /* create */ 1, &errMsg, &index); if (varPtr == NULL) { TclObjVarErrMsg(interp, myNamePtr, NULL, "create", errMsg, -1); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", TclGetString(myNamePtr), (char *)NULL); return TCL_ERROR; } } if (varPtr == otherPtr) { Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_NewStringObj( "can't upvar from variable to itself", -1)); Tcl_SetErrorCode(interp, "TCL", "UPVAR", "SELF", (char *)NULL); return TCL_ERROR; } if (TclIsVarTraced(varPtr)) { Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf( "variable \"%s\" has traces: can't use for upvar", myName)); Tcl_SetErrorCode(interp, "TCL", "UPVAR", "TRACED", (char *)NULL); return TCL_ERROR; } else if (!TclIsVarUndefined(varPtr)) { Var *linkPtr; /* * 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)) { Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf( "variable \"%s\" already exists", myName)); Tcl_SetErrorCode(interp, "TCL", "UPVAR", "EXISTS", (char *)NULL); return TCL_ERROR; } linkPtr = varPtr->value.linkPtr; if (linkPtr == otherPtr) { return TCL_OK; } if (TclIsVarInHash(linkPtr)) { VarHashRefCount(linkPtr)--; if (TclIsVarUndefined(linkPtr)) { CleanupVar(linkPtr, NULL); } } } TclSetVarLink(varPtr); varPtr->value.linkPtr = otherPtr; if (TclIsVarInHash(otherPtr)) { VarHashRefCount(otherPtr)++; } return TCL_OK; } /* *---------------------------------------------------------------------- * * 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 localNameStr, so that references to * localNameStr 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 *localNameStr, /* Name of link variable. */ int flags) /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY: * indicates scope of localNameStr. */ { 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(localNameStr, -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; Var *varPtr = (Var *) variable; Tcl_Obj *namePtr; Namespace *nsPtr; if (!varPtr || TclIsVarArrayElement(varPtr)) { return; } /* * Add the full name of the containing namespace (if any), followed by the * "::" separator, then the variable name. */ 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) { Tcl_Size index = varPtr - iPtr->varFramePtr->compiledLocals; if (index < iPtr->varFramePtr->numCompiledLocals) { namePtr = localName(iPtr->varFramePtr, index); Tcl_AppendObjToObj(objPtr, namePtr); } } } /* *---------------------------------------------------------------------- * * Tcl_ConstObjCmd -- * * This function is invoked to process the "const" 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_ConstObjCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Var *varPtr, *arrayPtr; Tcl_Obj *part1Ptr; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "varName value"); return TCL_ERROR; } part1Ptr = objv[1]; varPtr = TclObjLookupVarEx(interp, part1Ptr, NULL, TCL_LEAVE_ERR_MSG, "const", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (TclIsVarArray(varPtr)) { TclObjVarErrMsg(interp, part1Ptr, NULL, "make constant", ISARRAY, -1); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CONST", (void *)NULL); return TCL_ERROR; } if (TclIsVarArrayElement(varPtr)) { if (TclIsVarUndefined(varPtr)) { CleanupVar(varPtr, arrayPtr); } TclObjVarErrMsg(interp, part1Ptr, NULL, "make constant", ISARRAYELEMENT, -1); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CONST", (void *)NULL); return TCL_ERROR; } /* * If already exists, either a constant (no problem) or an error. */ if (!TclIsVarUndefined(varPtr)) { if (TclIsVarConstant(varPtr)) { return TCL_OK; } TclObjVarErrMsg(interp, part1Ptr, NULL, "make constant", EXISTS, -1); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CONST", (void *)NULL); return TCL_ERROR; } /* * Make the variable and flag it as a constant. */ if (TclPtrSetVar(interp, (Tcl_Var) varPtr, NULL, objv[1], NULL, objv[2], TCL_LEAVE_ERR_MSG) == NULL) { if (TclIsVarUndefined(varPtr)) { CleanupVar(varPtr, arrayPtr); } return TCL_ERROR; }; TclSetVarConstant(varPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * 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( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; Tcl_Obj *objPtr, *tailPtr; const char *varName; const char *tail; int result, i; /* * If we are not executing inside a Tcl procedure, just return. */ if (!HasLocalVars(iPtr->varFramePtr)) { return TCL_OK; } for (i=1 ; i varName) && ((tail[0] != ':') || (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( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; const char *varName, *tail, *cp; Var *varPtr, *arrayPtr; Tcl_Obj *varValuePtr; int i, result; Tcl_Obj *varNamePtr, *tailPtr; for (i=1 ; ivarFramePtr)) { /* * 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. * *---------------------------------------------------------------------- */ int Tcl_UpvarObjCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { CallFrame *framePtr; int result, hasLevel; Tcl_Obj *levelObj; if (objc < 3) { Tcl_WrongNumArgs(interp, 1, objv, "?level? otherVar localVar ?otherVar localVar ...?"); return TCL_ERROR; } if (objc & 1) { /* * Even number of arguments, so use the default level of "1" by * passing NULL to TclObjGetFrame. */ levelObj = NULL; hasLevel = 0; } else { /* * Odd number of arguments, so objv[1] must contain the level. */ levelObj = objv[1]; hasLevel = 1; } /* * Find the call frame containing each of the "other variables" to be * linked to. */ result = TclObjGetFrame(interp, levelObj, &framePtr); if (result == -1) { return TCL_ERROR; } if ((result == 0) && hasLevel) { /* * Synthesize an error message since TclObjGetFrame doesn't do this * for this particular case. */ Tcl_SetObjResult(interp, Tcl_ObjPrintf( "bad level \"%s\"", TclGetString(levelObj))); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LEVEL", TclGetString(levelObj), (char *)NULL); return TCL_ERROR; } /* * We've now finished with parsing levels; skip to the variable names. */ objc -= hasLevel + 1; objv += hasLevel + 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; } /* *---------------------------------------------------------------------- * * 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. * *---------------------------------------------------------------------- */ 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; ArraySearch *searchPtr; const char *handle = TclGetString(handleObj); char *end; if (varPtr->flags & VAR_SEARCH_ACTIVE) { Tcl_HashEntry *hPtr = Tcl_FindHashEntry(&iPtr->varSearches, varPtr); /* First look for same (Tcl_Obj *) */ for (searchPtr = (ArraySearch *)Tcl_GetHashValue(hPtr); searchPtr != NULL; searchPtr = searchPtr->nextPtr) { if (searchPtr->name == handleObj) { return searchPtr; } } /* Fallback: do string compares. */ for (searchPtr = (ArraySearch *)Tcl_GetHashValue(hPtr); searchPtr != NULL; searchPtr = searchPtr->nextPtr) { if (strcmp(TclGetString(searchPtr->name), handle) == 0) { return searchPtr; } } } if ((handle[0] != 's') || (handle[1] != '-') || (strtoul(handle + 2, &end, 10), end == (handle + 2)) || (*end != '-')) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "illegal search identifier \"%s\"", handle)); } else if (strcmp(end + 1, TclGetString(varNamePtr)) != 0) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "search identifier \"%s\" isn't for variable \"%s\"", handle, TclGetString(varNamePtr))); } else { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "couldn't find search \"%s\"", handle)); } Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAYSEARCH", handle, (char *)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, 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, arrayVarPtr); for (searchPtr = (ArraySearch *)Tcl_GetHashValue(sPtr); searchPtr != NULL; searchPtr = nextPtr) { nextPtr = searchPtr->nextPtr; Tcl_DecrRefCount(searchPtr->name); Tcl_Free(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)) { Tcl_Obj *objPtr; TclNewObj(objPtr); VarHashRefCount(varPtr)++; /* Make sure we get to remove from * hash. */ Tcl_GetVariableFullName(interp, (Tcl_Var) varPtr, objPtr); UnsetVarStruct(varPtr, NULL, iPtr, /* part1 */ objPtr, NULL, flags, -1); /* * We just unset the variable. However, an unset trace might * have re-set it, or might have re-established traces on it. * This namespace and its vartable are going away unconditionally, * so we cannot let such things linger. That would be a leak. * * First we destroy all traces. ... */ if (TclIsVarTraced(varPtr)) { Tcl_HashEntry *tPtr = Tcl_FindHashEntry(&iPtr->varTraces, varPtr); VarTrace *tracePtr = (VarTrace *)Tcl_GetHashValue(tPtr); ActiveVarTrace *activePtr; while (tracePtr) { VarTrace *prevPtr = tracePtr; tracePtr = tracePtr->nextPtr; prevPtr->nextPtr = NULL; Tcl_EventuallyFree(prevPtr, TCL_DYNAMIC); } Tcl_DeleteHashEntry(tPtr); varPtr->flags &= ~VAR_ALL_TRACES; for (activePtr = iPtr->activeVarTracePtr; activePtr != NULL; activePtr = activePtr->nextPtr) { if (activePtr->varPtr == varPtr) { activePtr->nextTracePtr = NULL; } } } /* * ...and then, if the variable still holds a value, we unset it * again. This time with no traces left, we're sure it goes away. */ if (!TclIsVarUndefined(varPtr)) { UnsetVarStruct(varPtr, NULL, iPtr, /* part1 */ objPtr, NULL, flags, -1); } Tcl_DecrRefCount(objPtr); /* free no longer needed obj */ 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; 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 = VarHashFirstVar(tablePtr, &search)) { UnsetVarStruct(varPtr, NULL, iPtr, VarHashGetKey(varPtr), NULL, flags, -1); VarHashDeleteEntry(varPtr); } 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. */ { Var *varPtr; Tcl_Size numLocals, i; Tcl_Obj **namePtrPtr; numLocals = framePtr->numCompiledLocals; varPtr = framePtr->compiledLocals; namePtrPtr = &localName(framePtr, 0); for (i=0 ; inumCompiledLocals = 0; } /* *---------------------------------------------------------------------- * * 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. */ int index) { Tcl_HashSearch search; Tcl_HashEntry *tPtr; Var *elPtr; ActiveVarTrace *activePtr; Tcl_Obj *objPtr; VarTrace *tracePtr; 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, index); } tPtr = Tcl_FindHashEntry(&iPtr->varTraces, elPtr); tracePtr = (VarTrace *)Tcl_GetHashValue(tPtr); while (tracePtr) { VarTrace *prevPtr = tracePtr; tracePtr = tracePtr->nextPtr; prevPtr->nextPtr = NULL; Tcl_EventuallyFree(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); } DeleteArrayVar(varPtr); } /* *---------------------------------------------------------------------- * * TclObjVarErrMsg -- * * 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 *part2Ptr = NULL, *part1Ptr = Tcl_NewStringObj(part1, -1); if (part2) { part2Ptr = Tcl_NewStringObj(part2, -1); } 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. */ { if (!part1Ptr) { if (index == -1) { Tcl_Panic("invalid part1Ptr and invalid index together"); } part1Ptr = localName(((Interp *)interp)->varFramePtr, index); } Tcl_SetObjResult(interp, Tcl_ObjPrintf("can't %s \"%s%s%s%s\": %s", operation, TclGetString(part1Ptr), (part2Ptr ? "(" : ""), (part2Ptr ? TclGetString(part2Ptr) : ""), (part2Ptr ? ")" : ""), reason)); } /* *---------------------------------------------------------------------- * * Internal functions for variable name object types -- * *---------------------------------------------------------------------- */ /* * localVarName - * * INTERNALREP DEFINITION: * twoPtrValue.ptr1: pointer to name obj in varFramePtr->localCache * or NULL if it is this same obj * twoPtrValue.ptr2: index into locals table */ static void FreeLocalVarName( Tcl_Obj *objPtr) { Tcl_Size index; Tcl_Obj *namePtr; LocalGetInternalRep(objPtr, index, namePtr); index++; /* Compiler warning bait. */ if (namePtr) { Tcl_DecrRefCount(namePtr); } } static void DupLocalVarName( Tcl_Obj *srcPtr, Tcl_Obj *dupPtr) { Tcl_Size index; Tcl_Obj *namePtr; LocalGetInternalRep(srcPtr, index, namePtr); if (!namePtr) { namePtr = srcPtr; } LocalSetInternalRep(dupPtr, index, namePtr); } /* * 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) { Tcl_Obj *arrayPtr, *elem; int parsed; ParsedGetInternalRep(objPtr, parsed, arrayPtr, elem); parsed++; /* Silence compiler. */ if (arrayPtr != NULL) { TclDecrRefCount(arrayPtr); TclDecrRefCount(elem); } } static void DupParsedVarName( Tcl_Obj *srcPtr, Tcl_Obj *dupPtr) { Tcl_Obj *arrayPtr, *elem; int parsed; ParsedGetInternalRep(srcPtr, parsed, arrayPtr, elem); parsed++; /* Silence compiler. */ ParsedSetInternalRep(dupPtr, arrayPtr, elem); } /* *---------------------------------------------------------------------- * * 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: * TCL_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; 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: * TCL_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; int search; int result; Tcl_Var var; Tcl_Obj *simpleNamePtr; const 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 & TCL_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 NULL; } } /* * Find the namespace(s) that contain the variable. */ if (!(flags & TCL_GLOBAL_ONLY)) { flags |= TCL_NAMESPACE_ONLY; } 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); } 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_SetObjResult(interp, Tcl_ObjPrintf( "unknown variable \"%s\"", name)); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARIABLE", name, (char *)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( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; const char *varName, *pattern, *simplePattern; Tcl_HashSearch search; Var *varPtr; Namespace *nsPtr; Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp); Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp); Tcl_Obj *listPtr, *elemObjPtr, *varNamePtr; int specificNsInPattern = 0;/* Init. to avoid compiler warning. */ Tcl_Obj *simplePatternPtr = NULL; /* * 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, 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 (!HasLocalVars(iPtr->varFramePtr) || 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) { TclNewObj(elemObjPtr); 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) { TclNewObj(elemObjPtr); 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 (iPtr->varFramePtr->procPtr != NULL) { AppendLocals(interp, listPtr, simplePatternPtr, 1, 0); } 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( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { const 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( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; Tcl_Obj *patternPtr, *listPtr; if (objc == 1) { patternPtr = NULL; } else if (objc == 2) { patternPtr = objv[1]; } else { Tcl_WrongNumArgs(interp, 1, objv, "?pattern?"); return TCL_ERROR; } if (!HasLocalVars(iPtr->varFramePtr)) { 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, 0); Tcl_SetObjResult(interp, listPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclInfoConstsCmd -- * * Called to implement the "info consts" command that returns the list of * constants 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 consts ?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 TclInfoConstsCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Interp *iPtr = (Interp *) interp; const char *varName, *pattern, *simplePattern; Tcl_HashSearch search; Var *varPtr; Namespace *nsPtr; Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp); Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp); Tcl_Obj *listPtr, *elemObjPtr, *varNamePtr; int specificNsInPattern = 0;/* Init. to avoid compiler warning. */ Tcl_Obj *simplePatternPtr = NULL; /* * 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, 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 (!HasLocalVars(iPtr->varFramePtr) || 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 && TclIsVarConstant(varPtr)) { if (!TclIsVarUndefined(varPtr) || TclIsVarNamespaceVar(varPtr)) { if (specificNsInPattern) { TclNewObj(elemObjPtr); 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 && TclIsVarConstant(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 (TclIsVarConstant(varPtr) && (!TclIsVarUndefined(varPtr) || TclIsVarNamespaceVar(varPtr))) { varNamePtr = VarHashGetKey(varPtr); varName = TclGetString(varNamePtr); if ((simplePattern == NULL) || Tcl_StringMatch(varName, simplePattern)) { if (specificNsInPattern) { TclNewObj(elemObjPtr); 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 (TclIsVarConstant(varPtr) && (!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 (iPtr->varFramePtr->procPtr != NULL) { AppendLocals(interp, listPtr, simplePatternPtr, 1, 1); } if (simplePatternPtr) { Tcl_DecrRefCount(simplePatternPtr); } 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 int ContextObjectContainsConstant( Tcl_ObjectContext context, Tcl_Obj *varNamePtr) { /* * Helper for AppendLocals to check if an object contains a variable * that is a constant. It's too complicated without factoring this * check out! */ Object *oPtr = (Object *) Tcl_ObjectContextObject(context); Namespace *nsPtr = (Namespace *) oPtr->namespacePtr; Var *varPtr = VarHashFindVar(&nsPtr->varTable, varNamePtr); return !TclIsVarUndefined(varPtr) && TclIsVarConstant(varPtr); } 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. */ int justConstants) /* 1 if just constants should be included. */ { Interp *iPtr = (Interp *) interp; Var *varPtr; Tcl_Size i, localVarCt; int added; Tcl_Obj *objNamePtr; const char *varName; TclVarHashTable *localVarTablePtr; Tcl_HashSearch search; Tcl_HashTable addedTable; const char *pattern = patternPtr? TclGetString(patternPtr) : NULL; localVarCt = iPtr->varFramePtr->numCompiledLocals; varPtr = iPtr->varFramePtr->compiledLocals; localVarTablePtr = iPtr->varFramePtr->varTablePtr; if (includeLinks) { Tcl_InitObjHashTable(&addedTable); } if (localVarCt > 0) { Tcl_Obj **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)) { if (!justConstants || TclIsVarConstant(varPtr)) { Tcl_ListObjAppendElement(interp, listPtr, *varNamePtr); } if (includeLinks) { Tcl_CreateHashEntry(&addedTable, *varNamePtr, &added); } } } varPtr++; } } /* * Do nothing if no local variables. */ if (localVarTablePtr == NULL) { goto objectVars; } /* * 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))) { if ((!justConstants || TclIsVarConstant(varPtr))) { Tcl_ListObjAppendElement(interp, listPtr, VarHashGetKey(varPtr)); } if (includeLinks) { Tcl_CreateHashEntry(&addedTable, VarHashGetKey(varPtr), &added); } } } goto objectVars; } /* * 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)) { if (!justConstants || TclIsVarConstant(varPtr)) { Tcl_ListObjAppendElement(interp, listPtr, objNamePtr); } if (includeLinks) { Tcl_CreateHashEntry(&addedTable, objNamePtr, &added); } } } } objectVars: if (!includeLinks) { return; } if (iPtr->varFramePtr->isProcCallFrame & FRAME_IS_METHOD) { Tcl_ObjectContext context = (Tcl_ObjectContext) iPtr->varFramePtr->clientData; Method *mPtr = (Method *) Tcl_ObjectContextMethod(context); PrivateVariableMapping *privatePtr; if (mPtr->declaringObjectPtr) { Object *oPtr = mPtr->declaringObjectPtr; FOREACH(objNamePtr, oPtr->variables) { Tcl_CreateHashEntry(&addedTable, objNamePtr, &added); if (justConstants && !ContextObjectContainsConstant(context, objNamePtr)) { continue; } if (added && (!pattern || Tcl_StringMatch(TclGetString(objNamePtr), pattern))) { Tcl_ListObjAppendElement(interp, listPtr, objNamePtr); } } FOREACH_STRUCT(privatePtr, oPtr->privateVariables) { Tcl_CreateHashEntry(&addedTable, privatePtr->variableObj, &added); if (justConstants && !ContextObjectContainsConstant(context, privatePtr->fullNameObj)) { continue; } if (added && (!pattern || Tcl_StringMatch(TclGetString(privatePtr->variableObj), pattern))) { Tcl_ListObjAppendElement(interp, listPtr, privatePtr->variableObj); } } } else { Class *clsPtr = mPtr->declaringClassPtr; FOREACH(objNamePtr, clsPtr->variables) { Tcl_CreateHashEntry(&addedTable, objNamePtr, &added); if (justConstants && !ContextObjectContainsConstant(context, objNamePtr)) { continue; } if (added && (!pattern || Tcl_StringMatch(TclGetString(objNamePtr), pattern))) { Tcl_ListObjAppendElement(interp, listPtr, objNamePtr); } } FOREACH_STRUCT(privatePtr, clsPtr->privateVariables) { Tcl_CreateHashEntry(&addedTable, privatePtr->variableObj, &added); if (justConstants && !ContextObjectContainsConstant(context, privatePtr->fullNameObj)) { continue; } if (added && (!pattern || Tcl_StringMatch(TclGetString(privatePtr->variableObj), pattern))) { Tcl_ListObjAppendElement(interp, listPtr, privatePtr->variableObj); } } } } Tcl_DeleteHashTable(&addedTable); } /* *---------------------------------------------------------------------- * * TclInfoConstantCmd -- * * Called to implement the "info constant" command that tests whether a * specific variable is a constant. Handles the following syntax: * * info constant varName * * 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 TclInfoConstantCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Var *varPtr, *arrayPtr; int result; if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "varName"); return TCL_ERROR; } varPtr = TclObjLookupVar(interp, objv[1], NULL, 0, "lookup", 0, 0, &arrayPtr); result = (varPtr && TclIsVarConstant(varPtr)); Tcl_SetObjResult(interp, Tcl_NewBooleanObj(result)); return TCL_OK; } /* * 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; tablePtr->arrayPtr = NULL; } static Tcl_HashEntry * AllocVarEntry( TCL_UNUSED(Tcl_HashTable *), void *keyPtr) /* Key to store in the hash table entry. */ { Tcl_Obj *objPtr = (Tcl_Obj *)keyPtr; Tcl_HashEntry *hPtr; Var *varPtr; varPtr = (Var *)Tcl_Alloc(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)) { Tcl_Free(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; const char *p1, *p2; size_t l1, l2; /* * If the object pointers are the same then they match. * OPT: this comparison was moved to the caller * * 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 string representations of the same length. */ return ((l1 == l2) && !memcmp(p1, p2, l1)); } /*---------------------------------------------------------------------- * * ArrayDefaultCmd -- * * This function implements the 'array default' Tcl command. * Refer to the user documentation for details on what it does. * * Results: * Returns a standard Tcl result. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ static int ArrayDefaultCmd( TCL_UNUSED(void *), Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { static const char *const options[] = { "get", "set", "exists", "unset", NULL }; enum arrayDefaultOptionsEnum { OPT_GET, OPT_SET, OPT_EXISTS, OPT_UNSET } option; Tcl_Obj *arrayNameObj, *defaultValueObj; Var *varPtr, *arrayPtr; int isArray; /* * Parse arguments. */ if (objc != 3 && objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "option arrayName ?value?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0, &option) != TCL_OK) { return TCL_ERROR; } arrayNameObj = objv[2]; if (TCL_ERROR == LocateArray(interp, arrayNameObj, &varPtr, &isArray)) { return TCL_ERROR; } switch (option) { case OPT_GET: if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName"); return TCL_ERROR; } if (!varPtr || TclIsVarUndefined(varPtr) || !isArray) { return NotArrayError(interp, arrayNameObj); } defaultValueObj = TclGetArrayDefault(varPtr); if (!defaultValueObj) { /* Array default must exist. */ Tcl_SetObjResult(interp, Tcl_NewStringObj( "array has no default value", -1)); Tcl_SetErrorCode(interp, "TCL", "READ", "ARRAY", "DEFAULT", (char *)NULL); return TCL_ERROR; } Tcl_SetObjResult(interp, defaultValueObj); return TCL_OK; case OPT_SET: if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName value"); return TCL_ERROR; } /* * Attempt to create array if needed. */ varPtr = TclObjLookupVarEx(interp, arrayNameObj, NULL, /*flags*/ TCL_LEAVE_ERR_MSG, /*msg*/ "array default set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr); if (varPtr == NULL) { return TCL_ERROR; } if (arrayPtr) { /* * Not a valid array name. */ CleanupVar(varPtr, arrayPtr); TclObjVarErrMsg(interp, arrayNameObj, NULL, "array default set", NEEDARRAY, -1); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARNAME", TclGetString(arrayNameObj), (char *)NULL); return TCL_ERROR; } if (!TclIsVarArray(varPtr) && !TclIsVarUndefined(varPtr)) { /* * Not an array. */ TclObjVarErrMsg(interp, arrayNameObj, NULL, "array default set", NEEDARRAY, -1); Tcl_SetErrorCode(interp, "TCL", "WRITE", "ARRAY", (char *)NULL); return TCL_ERROR; } if (!TclIsVarArray(varPtr)) { TclInitArrayVar(varPtr); } defaultValueObj = objv[3]; SetArrayDefault(varPtr, defaultValueObj); return TCL_OK; case OPT_EXISTS: if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName"); return TCL_ERROR; } /* * Undefined variables (whether or not they have storage allocated) do * not have defaults, and this is not an error case. */ if (!varPtr || TclIsVarUndefined(varPtr)) { Tcl_SetObjResult(interp, Tcl_NewBooleanObj(0)); } else if (!isArray) { return NotArrayError(interp, arrayNameObj); } else { defaultValueObj = TclGetArrayDefault(varPtr); Tcl_SetObjResult(interp, Tcl_NewBooleanObj(!!defaultValueObj)); } return TCL_OK; case OPT_UNSET: if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "arrayName"); return TCL_ERROR; } if (varPtr && !TclIsVarUndefined(varPtr)) { if (!isArray) { return NotArrayError(interp, arrayNameObj); } SetArrayDefault(varPtr, NULL); } return TCL_OK; } /* Unreached */ return TCL_ERROR; } /* * Initialize array variable. */ void TclInitArrayVar( Var *arrayPtr) { ArrayVarHashTable *tablePtr = (ArrayVarHashTable *)Tcl_Alloc(sizeof(ArrayVarHashTable)); /* * Mark the variable as an array. */ TclSetVarArray(arrayPtr); /* * Regular TclVarHashTable initialization. */ arrayPtr->value.tablePtr = (TclVarHashTable *) tablePtr; TclInitVarHashTable(arrayPtr->value.tablePtr, TclGetVarNsPtr(arrayPtr)); arrayPtr->value.tablePtr->arrayPtr = arrayPtr; /* * Default value initialization. */ tablePtr->defaultObj = NULL; } /* * Cleanup array variable. */ static void DeleteArrayVar( Var *arrayPtr) { ArrayVarHashTable *tablePtr = (ArrayVarHashTable *) arrayPtr->value.tablePtr; /* * Default value cleanup. */ SetArrayDefault(arrayPtr, NULL); /* * Regular TclVarHashTable cleanup. */ VarHashDeleteTable(arrayPtr->value.tablePtr); Tcl_Free(tablePtr); } /* * Get array default value if any. */ Tcl_Obj * TclGetArrayDefault( Var *arrayPtr) { ArrayVarHashTable *tablePtr = (ArrayVarHashTable *) arrayPtr->value.tablePtr; return tablePtr->defaultObj; } /* * Set/replace/unset array default value. */ static void SetArrayDefault( Var *arrayPtr, Tcl_Obj *defaultObj) { ArrayVarHashTable *tablePtr = (ArrayVarHashTable *) arrayPtr->value.tablePtr; /* * Increment/decrement refcount twice to ensure that the object is shared, * so that it doesn't get modified accidentally by the folling code: * * array default set v 1 * lappend v(a) 2; # returns a new object {1 2} * set v(b); # returns the original default object "1" */ if (tablePtr->defaultObj) { Tcl_DecrRefCount(tablePtr->defaultObj); Tcl_DecrRefCount(tablePtr->defaultObj); } tablePtr->defaultObj = defaultObj; if (tablePtr->defaultObj) { Tcl_IncrRefCount(tablePtr->defaultObj); Tcl_IncrRefCount(tablePtr->defaultObj); } } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */