/*
* tclVar.c --
*
* This file contains routines that implement Tcl variables (both scalars
* and arrays).
*
* The implementation of arrays is modelled after an initial
* implementation by Mark Diekhans and Karl Lehenbauer.
*
* Copyright (c) 1987-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 1998-1999 by Scriptics Corporation.
* Copyright (c) 2001 by Kevin B. Kenny. All rights reserved.
* Copyright (c) 2007 Miguel Sofer
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclVar.c,v 1.160.2.11 2010/09/01 19:42:40 andreas_kupries Exp $
*/
#include "tclInt.h"
/*
* Prototypes for the variable hash key methods.
*/
static Tcl_HashEntry * AllocVarEntry(Tcl_HashTable *tablePtr, void *keyPtr);
static void FreeVarEntry(Tcl_HashEntry *hPtr);
static int CompareVarKeys(void *keyPtr, Tcl_HashEntry *hPtr);
static unsigned int HashVarKey(Tcl_HashTable *tablePtr, void *keyPtr);
static Tcl_HashKeyType tclVarHashKeyType = {
TCL_HASH_KEY_TYPE_VERSION, /* version */
0, /* flags */
HashVarKey, /* hashKeyProc */
CompareVarKeys, /* compareKeysProc */
AllocVarEntry, /* allocEntryProc */
FreeVarEntry /* freeEntryProc */
};
static inline Var * VarHashCreateVar(TclVarHashTable *tablePtr,
Tcl_Obj *key, int *newPtr);
static inline Var * VarHashFirstVar(TclVarHashTable *tablePtr,
Tcl_HashSearch *searchPtr);
static inline Var * VarHashNextVar(Tcl_HashSearch *searchPtr);
static inline void CleanupVar(Var *varPtr, Var *arrayPtr);
#define VarHashGetValue(hPtr) \
((Var *) ((char *)hPtr - TclOffset(VarInHash, entry)))
static inline Var *
VarHashCreateVar(
TclVarHashTable *tablePtr,
Tcl_Obj *key,
int *newPtr)
{
Tcl_HashEntry *hPtr = Tcl_CreateHashEntry((Tcl_HashTable *) tablePtr,
(char *) key, newPtr);
if (hPtr) {
return VarHashGetValue(hPtr);
} else {
return NULL;
}
}
#define VarHashFindVar(tablePtr, key) \
VarHashCreateVar((tablePtr), (key), NULL)
#ifdef _AIX
/* Work around AIX cc problem causing crash in TclDeleteVars. Possible
* optimizer bug. Do _NOT_ inline this function, this re-activates the
* problem.
*/
static void
VarHashInvalidateEntry(Var* varPtr) {
varPtr->flags |= VAR_DEAD_HASH;
}
#else
#define VarHashInvalidateEntry(varPtr) \
((varPtr)->flags |= VAR_DEAD_HASH)
#endif
#define VarHashDeleteEntry(varPtr) \
Tcl_DeleteHashEntry(&(((VarInHash *) varPtr)->entry))
#define VarHashFirstEntry(tablePtr, searchPtr) \
Tcl_FirstHashEntry((Tcl_HashTable *) (tablePtr), (searchPtr))
#define VarHashNextEntry(searchPtr) \
Tcl_NextHashEntry((searchPtr))
static inline Var *
VarHashFirstVar(
TclVarHashTable *tablePtr,
Tcl_HashSearch *searchPtr)
{
Tcl_HashEntry *hPtr = VarHashFirstEntry(tablePtr, searchPtr);
if (hPtr) {
return VarHashGetValue(hPtr);
} else {
return NULL;
}
}
static inline Var *
VarHashNextVar(
Tcl_HashSearch *searchPtr)
{
Tcl_HashEntry *hPtr = VarHashNextEntry(searchPtr);
if (hPtr) {
return VarHashGetValue(hPtr);
} else {
return NULL;
}
}
#define VarHashGetKey(varPtr) \
(((VarInHash *)(varPtr))->entry.key.objPtr)
#define VarHashDeleteTable(tablePtr) \
Tcl_DeleteHashTable((Tcl_HashTable *) (tablePtr))
/*
* The strings below are used to indicate what went wrong when a variable
* access is denied.
*/
static const char *noSuchVar = "no such variable";
static const char *isArray = "variable is array";
static const char *needArray = "variable isn't array";
static const char *noSuchElement = "no such element in array";
static const char *danglingElement =
"upvar refers to element in deleted array";
static const char *danglingVar =
"upvar refers to variable in deleted namespace";
static const char *badNamespace = "parent namespace doesn't exist";
static const char *missingName = "missing variable name";
static const char *isArrayElement =
"name refers to an element in an array";
/*
* A test to see if we are in a call frame that has local variables. This is
* true if we are inside a procedure body.
*/
#define HasLocalVars(framePtr) ((framePtr)->isProcCallFrame & FRAME_IS_PROC)
/*
* Forward references to functions defined later in this file:
*/
static void AppendLocals(Tcl_Interp *interp, Tcl_Obj *listPtr,
Tcl_Obj *patternPtr, int includeLinks);
static void DeleteSearches(Interp *iPtr, Var *arrayVarPtr);
static void DeleteArray(Interp *iPtr, Tcl_Obj *arrayNamePtr,
Var *varPtr, int flags);
static Tcl_Var ObjFindNamespaceVar(Tcl_Interp *interp,
Tcl_Obj *namePtr, Tcl_Namespace *contextNsPtr,
int flags);
static int ObjMakeUpvar(Tcl_Interp *interp,
CallFrame *framePtr, Tcl_Obj *otherP1Ptr,
const char *otherP2, const int otherFlags,
Tcl_Obj *myNamePtr, int myFlags, int index);
static ArraySearch * ParseSearchId(Tcl_Interp *interp, const Var *varPtr,
Tcl_Obj *varNamePtr, Tcl_Obj *handleObj);
static void UnsetVarStruct(Var *varPtr, Var *arrayPtr,
Interp *iPtr, Tcl_Obj *part1Ptr,
Tcl_Obj *part2Ptr, int flags);
static int SetArraySearchObj(Tcl_Interp *interp,
Tcl_Obj *objPtr);
/*
* Functions defined in this file that may be exported in the future for use
* by the bytecode compiler and engine or to the public interface.
*/
MODULE_SCOPE Var * TclLookupSimpleVar(Tcl_Interp *interp,
Tcl_Obj *varNamePtr, int flags, const int create,
const char **errMsgPtr, int *indexPtr);
static Tcl_DupInternalRepProc DupLocalVarName;
static Tcl_FreeInternalRepProc FreeLocalVarName;
static Tcl_UpdateStringProc PanicOnUpdateVarName;
static Tcl_FreeInternalRepProc FreeParsedVarName;
static Tcl_DupInternalRepProc DupParsedVarName;
static Tcl_UpdateStringProc UpdateParsedVarName;
static Tcl_UpdateStringProc PanicOnUpdateVarName;
static Tcl_SetFromAnyProc PanicOnSetVarName;
/*
* Types of Tcl_Objs used to cache variable lookups.
*
* localVarName - INTERNALREP DEFINITION:
* ptrAndLongRep.ptr: pointer to name obj in varFramePtr->localCache
* or NULL if it is this same obj
* ptrAndLongRep.value: index into locals table
*
* nsVarName - INTERNALREP DEFINITION:
* twoPtrValue.ptr1: pointer to the namespace containing the reference
* twoPtrValue.ptr2: pointer to the corresponding Var
*
* parsedVarName - INTERNALREP DEFINITION:
* twoPtrValue.ptr1: pointer to the array name Tcl_Obj, or NULL if it is a
* scalar variable
* twoPtrValue.ptr2: pointer to the element name string (owned by this
* Tcl_Obj), or NULL if it is a scalar variable
*/
static Tcl_ObjType localVarNameType = {
"localVarName",
FreeLocalVarName, DupLocalVarName, PanicOnUpdateVarName, PanicOnSetVarName
};
/*
* Caching of namespace variables disabled: no simple way was found to avoid
* interfering with the resolver's idea of variable existence. A cached
* varName may keep a variable's name in the namespace's hash table, which is
* the resolver's criterion for existence (see test namespace-17.10).
*/
#define ENABLE_NS_VARNAME_CACHING 0
#if ENABLE_NS_VARNAME_CACHING
static Tcl_FreeInternalRepProc FreeNsVarName;
static Tcl_DupInternalRepProc DupNsVarName;
static Tcl_ObjType tclNsVarNameType = {
"namespaceVarName",
FreeNsVarName, DupNsVarName, PanicOnUpdateVarName, PanicOnSetVarName
};
#endif
static Tcl_ObjType tclParsedVarNameType = {
"parsedVarName",
FreeParsedVarName, DupParsedVarName, UpdateParsedVarName, PanicOnSetVarName
};
/*
* Type of Tcl_Objs used to speed up array searches.
*
* INTERNALREP DEFINITION:
* twoPtrValue.ptr1: searchIdNumber (cast to pointer)
* twoPtrValue.ptr2: variableNameStartInString (cast to pointer)
*
* Note that the value stored in ptr2 is the offset into the string of the
* start of the variable name and not the address of the variable name itself,
* as this can be safely copied.
*/
Tcl_ObjType tclArraySearchType = {
"array search",
NULL, NULL, NULL, SetArraySearchObj
};
Var *
TclVarHashCreateVar(
TclVarHashTable *tablePtr,
const char *key,
int *newPtr)
{
Tcl_Obj *keyPtr;
Var *varPtr;
keyPtr = Tcl_NewStringObj(key, -1);
Tcl_IncrRefCount(keyPtr);
varPtr = VarHashCreateVar(tablePtr, keyPtr, newPtr);
Tcl_DecrRefCount(keyPtr);
return varPtr;
}
/*
*----------------------------------------------------------------------
*
* TclCleanupVar --
*
* This function is called when it looks like it may be OK to free up a
* variable's storage. If the variable is in a hashtable, its Var
* structure and hash table entry will be freed along with those of its
* containing array, if any. This function is called, for example, when
* a trace on a variable deletes a variable.
*
* Results:
* None.
*
* Side effects:
* If the variable (or its containing array) really is dead and in a
* hashtable, then its Var structure, and possibly its hash table entry,
* is freed up.
*
*----------------------------------------------------------------------
*/
static inline void
CleanupVar(
Var *varPtr, /* Pointer to variable that may be a candidate
* for being expunged. */
Var *arrayPtr) /* Array that contains the variable, or NULL
* if this variable isn't an array element. */
{
if (TclIsVarUndefined(varPtr) && TclIsVarInHash(varPtr)
&& !TclIsVarTraced(varPtr)
&& (VarHashRefCount(varPtr) == !TclIsVarDeadHash(varPtr))) {
if (VarHashRefCount(varPtr) == 0) {
ckfree((char *) varPtr);
} else {
VarHashDeleteEntry(varPtr);
}
}
if (arrayPtr != NULL && TclIsVarUndefined(arrayPtr) &&
TclIsVarInHash(arrayPtr) && !TclIsVarTraced(arrayPtr) &&
(VarHashRefCount(arrayPtr) == !TclIsVarDeadHash(arrayPtr))) {
if (VarHashRefCount(arrayPtr) == 0) {
ckfree((char *) arrayPtr);
} else {
VarHashDeleteEntry(arrayPtr);
}
}
}
void
TclCleanupVar(
Var *varPtr, /* Pointer to variable that may be a candidate
* for being expunged. */
Var *arrayPtr) /* Array that contains the variable, or NULL
* if this variable isn't an array element. */
{
CleanupVar(varPtr, arrayPtr);
}
/*
*----------------------------------------------------------------------
*
* TclLookupVar --
*
* This function is used to locate a variable given its name(s). It has
* been mostly superseded by TclObjLookupVar, it is now only used by the
* trace code. It is kept in tcl8.5 mainly because it is in the internal
* stubs table, so that some extension may be calling it.
*
* Results:
* The return value is a pointer to the variable structure indicated by
* part1 and part2, or NULL if the variable couldn't be found. If the
* variable is found, *arrayPtrPtr is filled in with the address of the
* variable structure for the array that contains the variable (or NULL
* if the variable is a scalar). If the variable can't be found and
* either createPart1 or createPart2 are 1, a new as-yet-undefined
* (VAR_UNDEFINED) variable structure is created, entered into a hash
* table, and returned.
*
* If the variable isn't found and creation wasn't specified, or some
* other error occurs, NULL is returned and an error message is left in
* the interp's result if TCL_LEAVE_ERR_MSG is set in flags.
*
* Note: it's possible for the variable returned to be VAR_UNDEFINED even
* if createPart1 or createPart2 are 1 (these only cause the hash table
* entry or array to be created). For example, the variable might be a
* global that has been unset but is still referenced by a procedure, or
* a variable that has been unset but it only being kept in existence (if
* VAR_UNDEFINED) by a trace.
*
* Side effects:
* New hashtable entries may be created if createPart1 or createPart2
* are 1.
*
*----------------------------------------------------------------------
*/
Var *
TclLookupVar(
Tcl_Interp *interp, /* Interpreter to use for lookup. */
const char *part1, /* If part2 isn't NULL, this is the name of an
* array. Otherwise, this is a full variable
* name that could include a parenthesized
* array element. */
const char *part2, /* Name of element within array, or NULL. */
int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* and TCL_LEAVE_ERR_MSG bits matter. */
const char *msg, /* Verb to use in error messages, e.g. "read"
* or "set". Only needed if TCL_LEAVE_ERR_MSG
* is set in flags. */
int createPart1, /* If 1, create hash table entry for part 1 of
* name, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
int createPart2, /* If 1, create hash table entry for part 2 of
* name, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
Var **arrayPtrPtr) /* If the name refers to an element of an
* array, *arrayPtrPtr gets filled in with
* address of array variable. Otherwise this
* is set to NULL. */
{
Tcl_Obj *part1Ptr;
Var *varPtr;
part1Ptr = Tcl_NewStringObj(part1, -1);
Tcl_IncrRefCount(part1Ptr);
varPtr = TclObjLookupVar(interp, part1Ptr, part2, flags, msg,
createPart1, createPart2, arrayPtrPtr);
TclDecrRefCount(part1Ptr);
return varPtr;
}
/*
*----------------------------------------------------------------------
*
* TclObjLookupVar, TclObjLookupVarEx --
*
* This function is used by virtually all of the variable code to locate
* a variable given its name(s). The parsing into array/element
* components and (if possible) the lookup results are cached in
* part1Ptr, which is converted to one of the varNameTypes.
*
* Results:
* The return value is a pointer to the variable structure indicated by
* part1Ptr and part2, or NULL if the variable couldn't be found. If *
* the variable is found, *arrayPtrPtr is filled with the address of the
* variable structure for the array that contains the variable (or NULL
* if the variable is a scalar). If the variable can't be found and
* either createPart1 or createPart2 are 1, a new as-yet-undefined
* (VAR_UNDEFINED) variable structure is created, entered into a hash
* table, and returned.
*
* If the variable isn't found and creation wasn't specified, or some
* other error occurs, NULL is returned and an error message is left in
* the interp's result if TCL_LEAVE_ERR_MSG is set in flags.
*
* Note: it's possible for the variable returned to be VAR_UNDEFINED even
* if createPart1 or createPart2 are 1 (these only cause the hash table
* entry or array to be created). For example, the variable might be a
* global that has been unset but is still referenced by a procedure, or
* a variable that has been unset but it only being kept in existence (if
* VAR_UNDEFINED) by a trace.
*
* Side effects:
* New hashtable entries may be created if createPart1 or createPart2
* are 1. The object part1Ptr is converted to one of localVarNameType,
* tclNsVarNameType or tclParsedVarNameType and caches as much of the
* lookup as it can.
*
*----------------------------------------------------------------------
*/
Var *
TclObjLookupVar(
Tcl_Interp *interp, /* Interpreter to use for lookup. */
register Tcl_Obj *part1Ptr, /* If part2 isn't NULL, this is the name of an
* array. Otherwise, this is a full variable
* name that could include a parenthesized
* array element. */
const char *part2, /* Name of element within array, or NULL. */
int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* and TCL_LEAVE_ERR_MSG bits matter. */
const char *msg, /* Verb to use in error messages, e.g. "read"
* or "set". Only needed if TCL_LEAVE_ERR_MSG
* is set in flags. */
const int createPart1, /* If 1, create hash table entry for part 1 of
* name, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
const int createPart2, /* If 1, create hash table entry for part 2 of
* name, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
Var **arrayPtrPtr) /* If the name refers to an element of an
* array, *arrayPtrPtr gets filled in with
* address of array variable. Otherwise this
* is set to NULL. */
{
Tcl_Obj *part2Ptr;
Var *resPtr;
if (part2) {
part2Ptr = Tcl_NewStringObj(part2, -1);
Tcl_IncrRefCount(part2Ptr);
} else {
part2Ptr = NULL;
}
resPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr,
flags, msg, createPart1, createPart2, arrayPtrPtr);
if (part2Ptr) {
Tcl_DecrRefCount(part2Ptr);
}
return resPtr;
}
Var *
TclObjLookupVarEx(
Tcl_Interp *interp, /* Interpreter to use for lookup. */
Tcl_Obj *part1Ptr, /* If part2Ptr isn't NULL, this is the name of
* an array. Otherwise, this is a full
* variable name that could include a
* parenthesized array element. */
Tcl_Obj *part2Ptr, /* Name of element within array, or NULL. */
int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* and TCL_LEAVE_ERR_MSG bits matter. */
const char *msg, /* Verb to use in error messages, e.g. "read"
* or "set". Only needed if TCL_LEAVE_ERR_MSG
* is set in flags. */
const int createPart1, /* If 1, create hash table entry for part 1 of
* name, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
const int createPart2, /* If 1, create hash table entry for part 2 of
* name, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
Var **arrayPtrPtr) /* If the name refers to an element of an
* array, *arrayPtrPtr gets filled in with
* address of array variable. Otherwise this
* is set to NULL. */
{
Interp *iPtr = (Interp *) interp;
register Var *varPtr; /* Points to the variable's in-frame Var
* structure. */
char *part1;
int index, len1, len2;
int parsed = 0;
Tcl_Obj *objPtr;
const Tcl_ObjType *typePtr = part1Ptr->typePtr;
const char *errMsg = NULL;
CallFrame *varFramePtr = iPtr->varFramePtr;
#if ENABLE_NS_VARNAME_CACHING
Namespace *nsPtr;
#endif
char *part2 = part2Ptr? TclGetString(part2Ptr):NULL;
char *newPart2 = NULL;
*arrayPtrPtr = NULL;
#if ENABLE_NS_VARNAME_CACHING
if (varFramePtr) {
nsPtr = varFramePtr->nsPtr;
} else {
/*
* Some variables in the global ns have to be initialized before the
* root call frame is in place.
*/
nsPtr = NULL;
}
#endif
if (typePtr == &localVarNameType) {
int localIndex;
localVarNameTypeHandling:
localIndex = (int) part1Ptr->internalRep.ptrAndLongRep.value;
if (HasLocalVars(varFramePtr)
&& !(flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY))
&& (localIndex < varFramePtr->numCompiledLocals)) {
/*
* Use the cached index if the names coincide.
*/
Tcl_Obj *namePtr = (Tcl_Obj *)
part1Ptr->internalRep.ptrAndLongRep.ptr;
Tcl_Obj *checkNamePtr = localName(iPtr->varFramePtr, localIndex);
if ((!namePtr && (checkNamePtr == part1Ptr)) ||
(namePtr && (checkNamePtr == namePtr))) {
varPtr = (Var *) &(varFramePtr->compiledLocals[localIndex]);
goto donePart1;
}
}
goto doneParsing;
#if ENABLE_NS_VARNAME_CACHING
} else if (typePtr == &tclNsVarNameType) {
int useGlobal, useReference;
Namespace *cachedNsPtr = part1Ptr->internalRep.twoPtrValue.ptr1;
varPtr = part1Ptr->internalRep.twoPtrValue.ptr2;
useGlobal = (cachedNsPtr == iPtr->globalNsPtr) && (
(flags & TCL_GLOBAL_ONLY) ||
(part1[0]==':' && part1[1]==':') ||
(!HasLocalVars(varFramePtr) && (nsPtr==iPtr->globalNsPtr)));
useReference = useGlobal || ((cachedNsPtr == nsPtr) && (
(flags & TCL_NAMESPACE_ONLY) ||
(!HasLocalVars(varFramePtr) && !(flags & TCL_GLOBAL_ONLY) &&
/*
* Careful: an undefined ns variable could be hiding a valid
* global reference.
*/
!TclIsVarUndefined(varPtr))));
if (useReference && !TclIsVarDeadHash(varPtr)) {
/*
* A straight global or namespace reference, use it. It isn't so
* simple to deal with 'implicit' namespace references, i.e.,
* those where the reference could be to either a namespace or a
* global variable. Those we lookup again.
*
* If TclIsVarDeadHash(varPtr), this might be a reference to a
* variable in a deleted namespace, kept alive by e.g. part1Ptr.
* We could conceivably be so unlucky that a new namespace was
* created at the same address as the deleted one, so to be safe
* we test for a valid hPtr.
*/
goto donePart1;
}
goto doneParsing;
#endif
}
/*
* If part1Ptr is a tclParsedVarNameType, separate it into the pre-parsed
* parts.
*/
if (typePtr == &tclParsedVarNameType) {
if (part1Ptr->internalRep.twoPtrValue.ptr1 != NULL) {
if (part2Ptr != NULL) {
/*
* ERROR: part1Ptr is already an array element, cannot specify
* a part2.
*/
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg,
noSuchVar, -1);
}
return NULL;
}
part2 = newPart2 = part1Ptr->internalRep.twoPtrValue.ptr2;
if (newPart2) {
part2Ptr = Tcl_NewStringObj(newPart2, -1);
Tcl_IncrRefCount(part2Ptr);
}
part1Ptr = part1Ptr->internalRep.twoPtrValue.ptr1;
typePtr = part1Ptr->typePtr;
if (typePtr == &localVarNameType) {
goto localVarNameTypeHandling;
}
}
parsed = 1;
}
part1 = TclGetStringFromObj(part1Ptr, &len1);
if (!parsed && (*(part1 + len1 - 1) == ')')) {
/*
* part1Ptr is possibly an unparsed array element.
*/
register int i;
len2 = -1;
for (i = 0; i < len1; i++) {
if (*(part1 + i) == '(') {
if (part2Ptr != NULL) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg,
needArray, -1);
}
return NULL;
}
/*
* part1Ptr points to an array element; first copy the element
* name to a new string part2.
*/
part2 = part1 + i + 1;
len2 = len1 - i - 2;
len1 = i;
newPart2 = ckalloc((unsigned int) (len2+1));
memcpy(newPart2, part2, (unsigned int) len2);
*(newPart2+len2) = '\0';
part2 = newPart2;
part2Ptr = Tcl_NewStringObj(newPart2, -1);
Tcl_IncrRefCount(part2Ptr);
/*
* Free the internal rep of the original part1Ptr, now renamed
* objPtr, and set it to tclParsedVarNameType.
*/
objPtr = part1Ptr;
TclFreeIntRep(objPtr);
objPtr->typePtr = &tclParsedVarNameType;
/*
* Define a new string object to hold the new part1Ptr, i.e.,
* the array name. Set the internal rep of objPtr, reset
* typePtr and part1 to contain the references to the array
* name.
*/
TclNewStringObj(part1Ptr, part1, len1);
Tcl_IncrRefCount(part1Ptr);
objPtr->internalRep.twoPtrValue.ptr1 = part1Ptr;
objPtr->internalRep.twoPtrValue.ptr2 = (void *) part2;
typePtr = part1Ptr->typePtr;
part1 = TclGetString(part1Ptr);
break;
}
}
}
doneParsing:
/*
* part1Ptr is not an array element; look it up, and convert it to one of
* the cached types if possible.
*/
TclFreeIntRep(part1Ptr);
part1Ptr->typePtr = NULL;
varPtr = TclLookupSimpleVar(interp, part1Ptr, flags, createPart1,
&errMsg, &index);
if (varPtr == NULL) {
if ((errMsg != NULL) && (flags & TCL_LEAVE_ERR_MSG)) {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg, errMsg, -1);
}
if (newPart2) {
Tcl_DecrRefCount(part2Ptr);
}
return NULL;
}
/*
* Cache the newly found variable if possible.
*/
if (index >= 0) {
/*
* An indexed local variable.
*/
part1Ptr->typePtr = &localVarNameType;
if (part1Ptr != localName(iPtr->varFramePtr, index)) {
part1Ptr->internalRep.ptrAndLongRep.ptr =
localName(iPtr->varFramePtr, index);
Tcl_IncrRefCount((Tcl_Obj *)
part1Ptr->internalRep.ptrAndLongRep.ptr);
} else {
part1Ptr->internalRep.ptrAndLongRep.ptr = NULL;
}
part1Ptr->internalRep.ptrAndLongRep.value = (long) index;
#if ENABLE_NS_VARNAME_CACHING
} else if (index > -3) {
/*
* A cacheable namespace or global variable.
*/
Namespace *nsPtr;
nsPtr = ((index == -1) ? iPtr->globalNsPtr : varFramePtr->nsPtr);
varPtr->refCount++;
part1Ptr->typePtr = &tclNsVarNameType;
part1Ptr->internalRep.twoPtrValue.ptr1 = nsPtr;
part1Ptr->internalRep.twoPtrValue.ptr2 = varPtr;
#endif
} else {
/*
* At least mark part1Ptr as already parsed.
*/
part1Ptr->typePtr = &tclParsedVarNameType;
part1Ptr->internalRep.twoPtrValue.ptr1 = NULL;
part1Ptr->internalRep.twoPtrValue.ptr2 = NULL;
}
donePart1:
#if 0
if (varPtr == NULL) {
if (flags & TCL_LEAVE_ERR_MSG) {
part1 = TclGetString(part1Ptr);
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, msg,
"Cached variable reference is NULL.", -1);
}
return NULL;
}
#endif
while (TclIsVarLink(varPtr)) {
varPtr = varPtr->value.linkPtr;
}
if (part2Ptr != NULL) {
/*
* Array element sought: look it up.
*/
*arrayPtrPtr = varPtr;
varPtr = TclLookupArrayElement(interp, part1Ptr, part2Ptr, flags, msg,
createPart1, createPart2, varPtr, -1);
if (newPart2) {
Tcl_DecrRefCount(part2Ptr);
}
}
return varPtr;
}
/*
* This flag bit should not interfere with TCL_GLOBAL_ONLY,
* TCL_NAMESPACE_ONLY, or TCL_LEAVE_ERR_MSG; it signals that the variable
* lookup is performed for upvar (or similar) purposes, with slightly
* different rules:
* - Bug #696893 - variable is either proc-local or in the current
* namespace; never follow the second (global) resolution path
* - Bug #631741 - do not use special namespace or interp resolvers
*
* It should also not collide with the (deprecated) TCL_PARSE_PART1 flag
* (Bug #835020)
*/
#define AVOID_RESOLVERS 0x40000
/*
*----------------------------------------------------------------------
*
* TclLookupSimpleVar --
*
* This function is used by to locate a simple variable (i.e., not an
* array element) given its name.
*
* Results:
* The return value is a pointer to the variable structure indicated by
* varName, or NULL if the variable couldn't be found. If the variable
* can't be found and create is 1, a new as-yet-undefined (VAR_UNDEFINED)
* variable structure is created, entered into a hash table, and
* returned.
*
* If the current CallFrame corresponds to a proc and the variable found
* is one of the compiledLocals, its index is placed in *indexPtr.
* Otherwise, *indexPtr will be set to (according to the needs of
* TclObjLookupVar):
* -1 a global reference
* -2 a reference to a namespace variable
* -3 a non-cachable reference, i.e., one of:
* . non-indexed local var
* . a reference of unknown origin;
* . resolution by a namespace or interp resolver
*
* If the variable isn't found and creation wasn't specified, or some
* other error occurs, NULL is returned and the corresponding error
* message is left in *errMsgPtr.
*
* Note: it's possible for the variable returned to be VAR_UNDEFINED even
* if create is 1 (this only causes the hash table entry to be created).
* For example, the variable might be a global that has been unset but is
* still referenced by a procedure, or a variable that has been unset but
* it only being kept in existence (if VAR_UNDEFINED) by a trace.
*
* Side effects:
* A new hashtable entry may be created if create is 1.
*
*----------------------------------------------------------------------
*/
Var *
TclLookupSimpleVar(
Tcl_Interp *interp, /* Interpreter to use for lookup. */
Tcl_Obj *varNamePtr, /* This is a simple variable name that could
* represent a scalar or an array. */
int flags, /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* AVOID_RESOLVERS and TCL_LEAVE_ERR_MSG bits
* matter. */
const int create, /* If 1, create hash table entry for varname,
* if it doesn't already exist. If 0, return
* error if it doesn't exist. */
const char **errMsgPtr,
int *indexPtr)
{
Interp *iPtr = (Interp *) interp;
CallFrame *varFramePtr = iPtr->varFramePtr;
/* Points to the procedure call frame whose
* variables are currently in use. Same as the
* current procedure's frame, if any, unless
* an "uplevel" is executing. */
TclVarHashTable *tablePtr; /* Points to the hashtable, if any, in which
* to look up the variable. */
Tcl_Var var; /* Used to search for global names. */
Var *varPtr; /* Points to the Var structure returned for
* the variable. */
Namespace *varNsPtr, *cxtNsPtr, *dummy1Ptr, *dummy2Ptr;
ResolverScheme *resPtr;
int isNew, i, result;
const char *varName = TclGetString(varNamePtr);
varPtr = NULL;
varNsPtr = NULL; /* Set non-NULL if a nonlocal variable. */
*indexPtr = -3;
if (flags & TCL_GLOBAL_ONLY) {
cxtNsPtr = iPtr->globalNsPtr;
} else {
cxtNsPtr = iPtr->varFramePtr->nsPtr;
}
/*
* If this namespace has a variable resolver, then give it first crack at
* the variable resolution. It may return a Tcl_Var value, it may signal
* to continue onward, or it may signal an error.
*/
if ((cxtNsPtr->varResProc != NULL || iPtr->resolverPtr != NULL)
&& !(flags & AVOID_RESOLVERS)) {
resPtr = iPtr->resolverPtr;
if (cxtNsPtr->varResProc) {
result = (*cxtNsPtr->varResProc)(interp, varName,
(Tcl_Namespace *) cxtNsPtr, flags, &var);
} else {
result = TCL_CONTINUE;
}
while (result == TCL_CONTINUE && resPtr) {
if (resPtr->varResProc) {
result = (*resPtr->varResProc)(interp, varName,
(Tcl_Namespace *) cxtNsPtr, flags, &var);
}
resPtr = resPtr->nextPtr;
}
if (result == TCL_OK) {
return (Var *) var;
} else if (result != TCL_CONTINUE) {
return NULL;
}
}
/*
* Look up varName. Look it up as either a namespace variable or as a
* local variable in a procedure call frame (varFramePtr). Interpret
* varName as a namespace variable if:
* 1) so requested by a TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY flag,
* 2) there is no active frame (we're at the global :: scope),
* 3) the active frame was pushed to define the namespace context for a
* "namespace eval" or "namespace inscope" command,
* 4) the name has namespace qualifiers ("::"s).
* Otherwise, if varName is a local variable, search first in the frame's
* array of compiler-allocated local variables, then in its hashtable for
* runtime-created local variables.
*
* If create and the variable isn't found, create the variable and, if
* necessary, create varFramePtr's local var hashtable.
*/
if (((flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)) != 0)
|| !HasLocalVars(varFramePtr)
|| (strstr(varName, "::") != NULL)) {
const char *tail;
int lookGlobal = (flags & TCL_GLOBAL_ONLY)
|| (cxtNsPtr == iPtr->globalNsPtr)
|| ((*varName == ':') && (*(varName+1) == ':'));
if (lookGlobal) {
*indexPtr = -1;
flags = (flags | TCL_GLOBAL_ONLY) & ~TCL_NAMESPACE_ONLY;
} else {
if (flags & AVOID_RESOLVERS) {
flags = (flags | TCL_NAMESPACE_ONLY);
}
if (flags & TCL_NAMESPACE_ONLY) {
*indexPtr = -2;
}
}
/*
* Don't pass TCL_LEAVE_ERR_MSG, we may yet create the variable, or
* otherwise generate our own error!
*/
varPtr = (Var *) ObjFindNamespaceVar(interp, varNamePtr,
(Tcl_Namespace *) cxtNsPtr,
(flags | AVOID_RESOLVERS) & ~TCL_LEAVE_ERR_MSG);
if (varPtr == NULL) {
Tcl_Obj *tailPtr;
if (create) { /* Var wasn't found so create it. */
TclGetNamespaceForQualName(interp, varName, cxtNsPtr,
flags, &varNsPtr, &dummy1Ptr, &dummy2Ptr, &tail);
if (varNsPtr == NULL) {
*errMsgPtr = badNamespace;
return NULL;
} else if (tail == NULL) {
*errMsgPtr = missingName;
return NULL;
}
if (tail != varName) {
tailPtr = Tcl_NewStringObj(tail, -1);
} else {
tailPtr = varNamePtr;
}
varPtr = VarHashCreateVar(&varNsPtr->varTable, tailPtr,
&isNew);
if (lookGlobal) {
/*
* The variable was created starting from the global
* namespace: a global reference is returned even if it
* wasn't explicitly requested.
*/
*indexPtr = -1;
} else {
*indexPtr = -2;
}
} else { /* Var wasn't found and not to create it. */
*errMsgPtr = noSuchVar;
return NULL;
}
}
} else { /* Local var: look in frame varFramePtr. */
int localCt = varFramePtr->numCompiledLocals;
Tcl_Obj **objPtrPtr = &varFramePtr->localCachePtr->varName0;
for (i=0 ; i<localCt ; i++, objPtrPtr++) {
register Tcl_Obj *objPtr = *objPtrPtr;
if (objPtr) {
char *localName = TclGetString(objPtr);
if ((varName[0] == localName[0])
&& (strcmp(varName, localName) == 0)) {
*indexPtr = i;
return (Var *) &varFramePtr->compiledLocals[i];
}
}
}
tablePtr = varFramePtr->varTablePtr;
if (create) {
if (tablePtr == NULL) {
tablePtr = (TclVarHashTable *)
ckalloc(sizeof(TclVarHashTable));
TclInitVarHashTable(tablePtr, NULL);
varFramePtr->varTablePtr = tablePtr;
}
varPtr = VarHashCreateVar(tablePtr, varNamePtr, &isNew);
} else {
varPtr = NULL;
if (tablePtr != NULL) {
varPtr = VarHashFindVar(tablePtr, varNamePtr);
}
if (varPtr == NULL) {
*errMsgPtr = noSuchVar;
}
}
}
return varPtr;
}
/*
*----------------------------------------------------------------------
*
* TclLookupArrayElement --
*
* This function is used to locate a variable which is in an array's
* hashtable given a pointer to the array's Var structure and the
* element's name.
*
* Results:
* The return value is a pointer to the variable structure , or NULL if
* the variable couldn't be found.
*
* If arrayPtr points to a variable that isn't an array and createPart1
* is 1, the corresponding variable will be converted to an array.
* Otherwise, NULL is returned and an error message is left in the
* interp's result if TCL_LEAVE_ERR_MSG is set in flags.
*
* If the variable is not found and createPart2 is 1, the variable is
* created. Otherwise, NULL is returned and an error message is left in
* the interp's result if TCL_LEAVE_ERR_MSG is set in flags.
*
* Note: it's possible for the variable returned to be VAR_UNDEFINED even
* if createPart1 or createPart2 are 1 (these only cause the hash table
* entry or array to be created). For example, the variable might be a
* global that has been unset but is still referenced by a procedure, or
* a variable that has been unset but it only being kept in existence (if
* VAR_UNDEFINED) by a trace.
*
* Side effects:
* The variable at arrayPtr may be converted to be an array if
* createPart1 is 1. A new hashtable entry may be created if createPart2
* is 1.
*
*----------------------------------------------------------------------
*/
Var *
TclLookupArrayElement(
Tcl_Interp *interp, /* Interpreter to use for lookup. */
Tcl_Obj *arrayNamePtr, /* This is the name of the array, or NULL if
* index>= 0. */
Tcl_Obj *elNamePtr, /* Name of element within array. */
const int flags, /* Only TCL_LEAVE_ERR_MSG bit matters. */
const char *msg, /* Verb to use in error messages, e.g. "read"
* or "set". Only needed if TCL_LEAVE_ERR_MSG
* is set in flags. */
const int createArray, /* If 1, transform arrayName to be an array if
* it isn't one yet and the transformation is
* possible. If 0, return error if it isn't
* already an array. */
const int createElem, /* If 1, create hash table entry for the
* element, if it doesn't already exist. If 0,
* return error if it doesn't exist. */
Var *arrayPtr, /* Pointer to the array's Var structure. */
int index) /* If >=0, the index of the local array. */
{
int isNew;
Var *varPtr;
TclVarHashTable *tablePtr;
Namespace *nsPtr;
/*
* We're dealing with an array element. Make sure the variable is an array
* and look up the element (create the element if desired).
*/
if (TclIsVarUndefined(arrayPtr) && !TclIsVarArrayElement(arrayPtr)) {
if (!createArray) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg,
noSuchVar, index);
}
return NULL;
}
/*
* Make sure we are not resurrecting a namespace variable from a
* deleted namespace!
*/
if (TclIsVarDeadHash(arrayPtr)) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg,
danglingVar, index);
}
return NULL;
}
TclSetVarArray(arrayPtr);
tablePtr = (TclVarHashTable *) ckalloc(sizeof(TclVarHashTable));
arrayPtr->value.tablePtr = tablePtr;
if (TclIsVarInHash(arrayPtr) && TclGetVarNsPtr(arrayPtr)) {
nsPtr = TclGetVarNsPtr(arrayPtr);
} else {
nsPtr = NULL;
}
TclInitVarHashTable(arrayPtr->value.tablePtr, nsPtr);
} else if (!TclIsVarArray(arrayPtr)) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg, needArray,
index);
}
return NULL;
}
if (createElem) {
varPtr = VarHashCreateVar(arrayPtr->value.tablePtr, elNamePtr,
&isNew);
if (isNew) {
if (arrayPtr->flags & VAR_SEARCH_ACTIVE) {
DeleteSearches((Interp *) interp, arrayPtr);
}
TclSetVarArrayElement(varPtr);
}
} else {
varPtr = VarHashFindVar(arrayPtr->value.tablePtr, elNamePtr);
if (varPtr == NULL) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, arrayNamePtr, elNamePtr, msg,
noSuchElement, index);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ELEMENT",
TclGetString(elNamePtr), NULL);
}
}
}
return varPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetVar --
*
* Return the value of a Tcl variable as a string.
*
* Results:
* The return value points to the current value of varName as a string.
* If the variable is not defined or can't be read because of a clash in
* array usage then a NULL pointer is returned and an error message is
* left in the interp's result if the TCL_LEAVE_ERR_MSG flag is set.
* Note: the return value is only valid up until the next change to the
* variable; if you depend on the value lasting longer than that, then
* make yourself a private copy.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
const char *
Tcl_GetVar(
Tcl_Interp *interp, /* Command interpreter in which varName is to
* be looked up. */
const char *varName, /* Name of a variable in interp. */
int flags) /* OR-ed combination of TCL_GLOBAL_ONLY,
* TCL_NAMESPACE_ONLY or TCL_LEAVE_ERR_MSG
* bits. */
{
return Tcl_GetVar2(interp, varName, NULL, flags);
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetVar2 --
*
* Return the value of a Tcl variable as a string, given a two-part name
* consisting of array name and element within array.
*
* Results:
* The return value points to the current value of the variable given by
* part1 and part2 as a string. If the specified variable doesn't exist,
* or if there is a clash in array usage, then NULL is returned and a
* message will be left in the interp's result if the TCL_LEAVE_ERR_MSG
* flag is set. Note: the return value is only valid up until the next
* change to the variable; if you depend on the value lasting longer than
* that, then make yourself a private copy.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
const char *
Tcl_GetVar2(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be looked up. */
const char *part1, /* Name of an array (if part2 is non-NULL) or
* the name of a variable. */
const char *part2, /* If non-NULL, gives the name of an element
* in the array part1. */
int flags) /* OR-ed combination of TCL_GLOBAL_ONLY,
* TCL_NAMESPACE_ONLY and TCL_LEAVE_ERR_MSG *
* bits. */
{
Tcl_Obj *objPtr;
objPtr = Tcl_GetVar2Ex(interp, part1, part2, flags);
if (objPtr == NULL) {
return NULL;
}
return TclGetString(objPtr);
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetVar2Ex --
*
* Return the value of a Tcl variable as a Tcl object, given a two-part
* name consisting of array name and element within array.
*
* Results:
* The return value points to the current object value of the variable
* given by part1Ptr and part2Ptr. If the specified variable doesn't
* exist, or if there is a clash in array usage, then NULL is returned
* and a message will be left in the interpreter's result if the
* TCL_LEAVE_ERR_MSG flag is set.
*
* Side effects:
* The ref count for the returned object is _not_ incremented to reflect
* the returned reference; if you want to keep a reference to the object
* you must increment its ref count yourself.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_GetVar2Ex(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be looked up. */
const char *part1, /* Name of an array (if part2 is non-NULL) or
* the name of a variable. */
const char *part2, /* If non-NULL, gives the name of an element
* in the array part1. */
int flags) /* OR-ed combination of TCL_GLOBAL_ONLY, and
* TCL_LEAVE_ERR_MSG bits. */
{
Tcl_Obj *part1Ptr, *part2Ptr, *resPtr;
part1Ptr = Tcl_NewStringObj(part1, -1);
Tcl_IncrRefCount(part1Ptr);
if (part2) {
part2Ptr = Tcl_NewStringObj(part2, -1);
Tcl_IncrRefCount(part2Ptr);
} else {
part2Ptr = NULL;
}
resPtr = Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags);
Tcl_DecrRefCount(part1Ptr);
if (part2Ptr) {
Tcl_DecrRefCount(part2Ptr);
}
return resPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ObjGetVar2 --
*
* Return the value of a Tcl variable as a Tcl object, given a two-part
* name consisting of array name and element within array.
*
* Results:
* The return value points to the current object value of the variable
* given by part1Ptr and part2Ptr. If the specified variable doesn't
* exist, or if there is a clash in array usage, then NULL is returned
* and a message will be left in the interpreter's result if the
* TCL_LEAVE_ERR_MSG flag is set.
*
* Side effects:
* The ref count for the returned object is _not_ incremented to reflect
* the returned reference; if you want to keep a reference to the object
* you must increment its ref count yourself.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_ObjGetVar2(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be looked up. */
register Tcl_Obj *part1Ptr, /* Points to an object holding the name of an
* array (if part2 is non-NULL) or the name of
* a variable. */
register Tcl_Obj *part2Ptr, /* If non-null, points to an object holding
* the name of an element in the array
* part1Ptr. */
int flags) /* OR-ed combination of TCL_GLOBAL_ONLY and
* TCL_LEAVE_ERR_MSG bits. */
{
Var *varPtr, *arrayPtr;
/*
* Filter to pass through only the flags this interface supports.
*/
flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG);
varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read",
/*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr);
if (varPtr == NULL) {
return NULL;
}
return TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
flags, -1);
}
/*
*----------------------------------------------------------------------
*
* TclPtrGetVar --
*
* Return the value of a Tcl variable as a Tcl object, given the pointers
* to the variable's (and possibly containing array's) VAR structure.
*
* Results:
* The return value points to the current object value of the variable
* given by varPtr. If the specified variable doesn't exist, or if there
* is a clash in array usage, then NULL is returned and a message will be
* left in the interpreter's result if the TCL_LEAVE_ERR_MSG flag is set.
*
* Side effects:
* The ref count for the returned object is _not_ incremented to reflect
* the returned reference; if you want to keep a reference to the object
* you must increment its ref count yourself.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclPtrGetVar(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be looked up. */
register Var *varPtr, /* The variable to be read.*/
Var *arrayPtr, /* NULL for scalar variables, pointer to the
* containing array otherwise. */
Tcl_Obj *part1Ptr, /* Name of an array (if part2 is non-NULL) or
* the name of a variable. */
Tcl_Obj *part2Ptr, /* If non-NULL, gives the name of an element
* in the array part1. */
const int flags, /* OR-ed combination of TCL_GLOBAL_ONLY, and
* TCL_LEAVE_ERR_MSG bits. */
int index) /* Index into the local variable table of the
* variable, or -1. Only used when part1Ptr is
* NULL. */
{
Interp *iPtr = (Interp *) interp;
const char *msg;
/*
* Invoke any read traces that have been set for the variable.
*/
if ((varPtr->flags & VAR_TRACED_READ)
|| (arrayPtr && (arrayPtr->flags & VAR_TRACED_READ))) {
if (TCL_ERROR == TclObjCallVarTraces(iPtr, arrayPtr, varPtr,
part1Ptr, part2Ptr,
(flags & (TCL_NAMESPACE_ONLY|TCL_GLOBAL_ONLY))
| TCL_TRACE_READS, (flags & TCL_LEAVE_ERR_MSG), index)) {
goto errorReturn;
}
}
/*
* Return the element if it's an existing scalar variable.
*/
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
return varPtr->value.objPtr;
}
if (flags & TCL_LEAVE_ERR_MSG) {
if (TclIsVarUndefined(varPtr) && arrayPtr
&& !TclIsVarUndefined(arrayPtr)) {
msg = noSuchElement;
} else if (TclIsVarArray(varPtr)) {
msg = isArray;
} else {
msg = noSuchVar;
}
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "read", msg, index);
}
/*
* An error. If the variable doesn't exist anymore and no-one's using it,
* then free up the relevant structures and hash table entries.
*/
errorReturn:
if (TclIsVarUndefined(varPtr)) {
TclCleanupVar(varPtr, arrayPtr);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetObjCmd --
*
* This function is invoked to process the "set" Tcl command. See the
* user documentation for details on what it does.
*
* Results:
* A standard Tcl result value.
*
* Side effects:
* A variable's value may be changed.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_SetObjCmd(
ClientData dummy, /* Not used. */
register Tcl_Interp *interp,/* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Obj *varValueObj;
if (objc == 2) {
varValueObj = Tcl_ObjGetVar2(interp, objv[1], NULL,TCL_LEAVE_ERR_MSG);
if (varValueObj == NULL) {
return TCL_ERROR;
}
Tcl_SetObjResult(interp, varValueObj);
return TCL_OK;
} else if (objc == 3) {
varValueObj = Tcl_ObjSetVar2(interp, objv[1], NULL, objv[2],
TCL_LEAVE_ERR_MSG);
if (varValueObj == NULL) {
return TCL_ERROR;
}
Tcl_SetObjResult(interp, varValueObj);
return TCL_OK;
} else {
Tcl_WrongNumArgs(interp, 1, objv, "varName ?newValue?");
return TCL_ERROR;
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetVar --
*
* Change the value of a variable.
*
* Results:
* Returns a pointer to the malloc'ed string which is the character
* representation of the variable's new value. The caller must not modify
* this string. If the write operation was disallowed then NULL is
* returned; if the TCL_LEAVE_ERR_MSG flag is set, then an explanatory
* message will be left in the interp's result. Note that the returned
* string may not be the same as newValue; this is because variable
* traces may modify the variable's value.
*
* Side effects:
* If varName is defined as a local or global variable in interp, its
* value is changed to newValue. If varName isn't currently defined, then
* a new global variable by that name is created.
*
*----------------------------------------------------------------------
*/
const char *
Tcl_SetVar(
Tcl_Interp *interp, /* Command interpreter in which varName is to
* be looked up. */
const char *varName, /* Name of a variable in interp. */
const char *newValue, /* New value for varName. */
int flags) /* Various flags that tell how to set value:
* any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_APPEND_VALUE, TCL_LIST_ELEMENT,
* TCL_LEAVE_ERR_MSG. */
{
return Tcl_SetVar2(interp, varName, NULL, newValue, flags);
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetVar2 --
*
* Given a two-part variable name, which may refer either to a scalar
* variable or an element of an array, change the value of the variable.
* If the named scalar or array or element doesn't exist then create one.
*
* Results:
* Returns a pointer to the malloc'ed string which is the character
* representation of the variable's new value. The caller must not modify
* this string. If the write operation was disallowed because an array
* was expected but not found (or vice versa), then NULL is returned; if
* the TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be
* left in the interp's result. Note that the returned string may not be
* the same as newValue; this is because variable traces may modify the
* variable's value.
*
* Side effects:
* The value of the given variable is set. If either the array or the
* entry didn't exist then a new one is created.
*
*----------------------------------------------------------------------
*/
const char *
Tcl_SetVar2(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be looked up. */
const char *part1, /* If part2 is NULL, this is name of scalar
* variable. Otherwise it is the name of an
* array. */
const char *part2, /* Name of an element within an array, or
* NULL. */
const char *newValue, /* New value for variable. */
int flags) /* Various flags that tell how to set value:
* any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_APPEND_VALUE, TCL_LIST_ELEMENT, or
* TCL_LEAVE_ERR_MSG. */
{
register Tcl_Obj *valuePtr;
Tcl_Obj *varValuePtr;
/*
* Create an object holding the variable's new value and use Tcl_SetVar2Ex
* to actually set the variable.
*/
valuePtr = Tcl_NewStringObj(newValue, -1);
Tcl_IncrRefCount(valuePtr);
varValuePtr = Tcl_SetVar2Ex(interp, part1, part2, valuePtr, flags);
Tcl_DecrRefCount(valuePtr);
if (varValuePtr == NULL) {
return NULL;
}
return TclGetString(varValuePtr);
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetVar2Ex --
*
* Given a two-part variable name, which may refer either to a scalar
* variable or an element of an array, change the value of the variable
* to a new Tcl object value. If the named scalar or array or element
* doesn't exist then create one.
*
* Results:
* Returns a pointer to the Tcl_Obj holding the new value of the
* variable. If the write operation was disallowed because an array was
* expected but not found (or vice versa), then NULL is returned; if the
* TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be
* left in the interpreter's result. Note that the returned object may
* not be the same one referenced by newValuePtr; this is because
* variable traces may modify the variable's value.
*
* Side effects:
* The value of the given variable is set. If either the array or the
* entry didn't exist then a new variable is created.
*
* The reference count is decremented for any old value of the variable
* and incremented for its new value. If the new value for the variable
* is not the same one referenced by newValuePtr (perhaps as a result of
* a variable trace), then newValuePtr's ref count is left unchanged by
* Tcl_SetVar2Ex. newValuePtr's ref count is also left unchanged if we
* are appending it as a string value: that is, if "flags" includes
* TCL_APPEND_VALUE but not TCL_LIST_ELEMENT.
*
* The reference count for the returned object is _not_ incremented: if
* you want to keep a reference to the object you must increment its ref
* count yourself.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_SetVar2Ex(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be found. */
const char *part1, /* Name of an array (if part2 is non-NULL) or
* the name of a variable. */
const char *part2, /* If non-NULL, gives the name of an element
* in the array part1. */
Tcl_Obj *newValuePtr, /* New value for variable. */
int flags) /* Various flags that tell how to set value:
* any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_APPEND_VALUE, TCL_LIST_ELEMENT or
* TCL_LEAVE_ERR_MSG. */
{
Tcl_Obj *part1Ptr, *part2Ptr, *resPtr;
part1Ptr = Tcl_NewStringObj(part1, -1);
Tcl_IncrRefCount(part1Ptr);
if (part2) {
part2Ptr = Tcl_NewStringObj(part2, -1);
Tcl_IncrRefCount(part2Ptr);
} else {
part2Ptr = NULL;
}
resPtr = Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, newValuePtr, flags);
Tcl_DecrRefCount(part1Ptr);
if (part2Ptr) {
Tcl_DecrRefCount(part2Ptr);
}
return resPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ObjSetVar2 --
*
* This function is the same as Tcl_SetVar2Ex above, except the variable
* names are passed in Tcl object instead of strings.
*
* Results:
* Returns a pointer to the Tcl_Obj holding the new value of the
* variable. If the write operation was disallowed because an array was
* expected but not found (or vice versa), then NULL is returned; if the
* TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be
* left in the interpreter's result. Note that the returned object may
* not be the same one referenced by newValuePtr; this is because
* variable traces may modify the variable's value.
*
* Side effects:
* The value of the given variable is set. If either the array or the
* entry didn't exist then a new variable is created.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_ObjSetVar2(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be found. */
register Tcl_Obj *part1Ptr, /* Points to an object holding the name of an
* array (if part2 is non-NULL) or the name of
* a variable. */
register Tcl_Obj *part2Ptr, /* If non-NULL, points to an object holding
* the name of an element in the array
* part1Ptr. */
Tcl_Obj *newValuePtr, /* New value for variable. */
int flags) /* Various flags that tell how to set value:
* any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_APPEND_VALUE, TCL_LIST_ELEMENT, or
* TCL_LEAVE_ERR_MSG. */
{
Var *varPtr, *arrayPtr;
/*
* Filter to pass through only the flags this interface supports.
*/
flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG
|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "set",
/*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
if (varPtr == NULL) {
if (newValuePtr->refCount == 0) {
Tcl_DecrRefCount(newValuePtr);
}
return NULL;
}
return TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
newValuePtr, flags, -1);
}
/*
*----------------------------------------------------------------------
*
* TclPtrSetVar --
*
* This function is the same as Tcl_SetVar2Ex above, except that it
* requires pointers to the variable's Var structs in addition to the
* variable names.
*
* Results:
* Returns a pointer to the Tcl_Obj holding the new value of the
* variable. If the write operation was disallowed because an array was
* expected but not found (or vice versa), then NULL is returned; if the
* TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be
* left in the interpreter's result. Note that the returned object may
* not be the same one referenced by newValuePtr; this is because
* variable traces may modify the variable's value.
*
* Side effects:
* The value of the given variable is set. If either the array or the
* entry didn't exist then a new variable is created.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclPtrSetVar(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be looked up. */
register Var *varPtr, /* Reference to the variable to set. */
Var *arrayPtr, /* Reference to the array containing the
* variable, or NULL if the variable is a
* scalar. */
Tcl_Obj *part1Ptr, /* Name of an array (if part2 is non-NULL) or
* the name of a variable. NULL if the 'index'
* parameter is >= 0 */
Tcl_Obj *part2Ptr, /* If non-NULL, gives the name of an element
* in the array part1. */
Tcl_Obj *newValuePtr, /* New value for variable. */
const int flags, /* OR-ed combination of TCL_GLOBAL_ONLY, and
* TCL_LEAVE_ERR_MSG bits. */
int index) /* Index of local var where part1 is to be
* found. */
{
Interp *iPtr = (Interp *) interp;
Tcl_Obj *oldValuePtr;
Tcl_Obj *resultPtr = NULL;
int result;
/*
* If the variable is in a hashtable and its hPtr field is NULL, then we
* may have an upvar to an array element where the array was deleted or an
* upvar to a namespace variable whose namespace was deleted. Generate an
* error (allowing the variable to be reset would screw up our storage
* allocation and is meaningless anyway).
*/
if (TclIsVarDeadHash(varPtr)) {
if (flags & TCL_LEAVE_ERR_MSG) {
if (TclIsVarArrayElement(varPtr)) {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set",
danglingElement, index);
} else {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set",
danglingVar, index);
}
}
goto earlyError;
}
/*
* It's an error to try to set an array variable itself.
*/
if (TclIsVarArray(varPtr)) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "set", isArray,index);
}
goto earlyError;
}
/*
* Invoke any read traces that have been set for the variable if it is
* requested. This 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 0
/*
* Can't happen now!
*/
if (TclIsVarUndefined(varPtr) && (oldValuePtr != NULL)) {
TclDecrRefCount(oldValuePtr); /* Discard old value. */
varPtr->value.objPtr = NULL;
oldValuePtr = NULL;
}
#endif
if (flags & TCL_LIST_ELEMENT) { /* Append list element. */
if (oldValuePtr == NULL) {
TclNewObj(oldValuePtr);
varPtr->value.objPtr = oldValuePtr;
Tcl_IncrRefCount(oldValuePtr); /* Since var is referenced. */
} else if (Tcl_IsShared(oldValuePtr)) {
varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr);
TclDecrRefCount(oldValuePtr);
oldValuePtr = varPtr->value.objPtr;
Tcl_IncrRefCount(oldValuePtr); /* Since var is referenced. */
}
result = Tcl_ListObjAppendElement(interp, oldValuePtr,
newValuePtr);
if (result != TCL_OK) {
goto earlyError;
}
} else { /* Append string. */
/*
* We append newValuePtr's bytes but don't change its ref count.
*/
if (oldValuePtr == NULL) {
varPtr->value.objPtr = newValuePtr;
Tcl_IncrRefCount(newValuePtr);
} else {
if (Tcl_IsShared(oldValuePtr)) { /* Append to copy. */
varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr);
/*
* TIP #280.
* Ensure that the continuation line data for the string
* is not lost and applies to the extended script as well.
*/
TclContinuationsCopy (varPtr->value.objPtr, oldValuePtr);
TclDecrRefCount(oldValuePtr);
oldValuePtr = varPtr->value.objPtr;
Tcl_IncrRefCount(oldValuePtr); /* Since var is ref */
}
Tcl_AppendObjToObj(oldValuePtr, newValuePtr);
}
}
} else if (newValuePtr != oldValuePtr) {
/*
* In this case we are replacing the value, so we don't need to do
* more than swap the objects.
*/
varPtr->value.objPtr = newValuePtr;
Tcl_IncrRefCount(newValuePtr); /* Var is another ref. */
if (oldValuePtr != NULL) {
TclDecrRefCount(oldValuePtr); /* Discard old value. */
}
}
/*
* Invoke any write traces for the variable.
*/
if ((varPtr->flags & VAR_TRACED_WRITE)
|| (arrayPtr && (arrayPtr->flags & VAR_TRACED_WRITE))) {
if (TCL_ERROR == TclObjCallVarTraces(iPtr, arrayPtr, varPtr, part1Ptr,
part2Ptr, (flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY))
| TCL_TRACE_WRITES, (flags & TCL_LEAVE_ERR_MSG), index)) {
goto cleanup;
}
}
/*
* Return the variable's value unless the variable was changed in some
* gross way by a trace (e.g. it was unset and then recreated as an
* array).
*/
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
return varPtr->value.objPtr;
}
/*
* A trace changed the value in some gross way. Return an empty string
* object.
*/
resultPtr = iPtr->emptyObjPtr;
/*
* If the variable doesn't exist anymore and no-one's using it, then free
* up the relevant structures and hash table entries.
*/
cleanup:
if (TclIsVarUndefined(varPtr)) {
TclCleanupVar(varPtr, arrayPtr);
}
return resultPtr;
earlyError:
if (newValuePtr->refCount == 0) {
Tcl_DecrRefCount(newValuePtr);
}
goto cleanup;
}
/*
*----------------------------------------------------------------------
*
* TclIncrObjVar2 --
*
* Given a two-part variable name, which may refer either to a scalar
* variable or an element of an array, increment the Tcl object value of
* the variable by a specified Tcl_Obj increment value.
*
* Results:
* Returns a pointer to the Tcl_Obj holding the new value of the
* variable. If the specified variable doesn't exist, or there is a clash
* in array usage, or an error occurs while executing variable traces,
* then NULL is returned and a message will be left in the interpreter's
* result.
*
* Side effects:
* The value of the given variable is incremented by the specified
* amount. If either the array or the entry didn't exist then a new
* variable is created. The ref count for the returned object is _not_
* incremented to reflect the returned reference; if you want to keep a
* reference to the object you must increment its ref count yourself.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclIncrObjVar2(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be found. */
Tcl_Obj *part1Ptr, /* Points to an object holding the name of an
* array (if part2 is non-NULL) or the name of
* a variable. */
Tcl_Obj *part2Ptr, /* If non-null, points to an object holding
* the name of an element in the array
* part1Ptr. */
Tcl_Obj *incrPtr, /* Amount to be added to variable. */
int flags) /* Various flags that tell how to incr value:
* any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_APPEND_VALUE, TCL_LIST_ELEMENT,
* TCL_LEAVE_ERR_MSG. */
{
Var *varPtr, *arrayPtr;
varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read",
1, 1, &arrayPtr);
if (varPtr == NULL) {
Tcl_AddObjErrorInfo(interp,
"\n (reading value of variable to increment)", -1);
return NULL;
}
return TclPtrIncrObjVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
incrPtr, flags, -1);
}
/*
*----------------------------------------------------------------------
*
* TclPtrIncrObjVar --
*
* Given the pointers to a variable and possible containing array,
* increment the Tcl object value of the variable by a Tcl_Obj increment.
*
* Results:
* Returns a pointer to the Tcl_Obj holding the new value of the
* variable. If the specified variable doesn't exist, or there is a clash
* in array usage, or an error occurs while executing variable traces,
* then NULL is returned and a message will be left in the interpreter's
* result.
*
* Side effects:
* The value of the given variable is incremented by the specified
* amount. If either the array or the entry didn't exist then a new
* variable is created. The ref count for the returned object is _not_
* incremented to reflect the returned reference; if you want to keep a
* reference to the object you must increment its ref count yourself.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclPtrIncrObjVar(
Tcl_Interp *interp, /* Command interpreter in which variable is to
* be found. */
Var *varPtr, /* Reference to the variable to set. */
Var *arrayPtr, /* Reference to the array containing the
* variable, or NULL if the variable is a
* scalar. */
Tcl_Obj *part1Ptr, /* Points to an object holding the name of an
* array (if part2 is non-NULL) or the name of
* a variable. */
Tcl_Obj *part2Ptr, /* If non-null, points to an object holding
* the name of an element in the array
* part1Ptr. */
Tcl_Obj *incrPtr, /* Increment value. */
/* TODO: Which of these flag values really make sense? */
const int flags, /* Various flags that tell how to incr value:
* any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_APPEND_VALUE, TCL_LIST_ELEMENT,
* TCL_LEAVE_ERR_MSG. */
int index) /* Index into the local variable table of the
* variable, or -1. Only used when part1Ptr is
* NULL. */
{
register Tcl_Obj *varValuePtr, *newValuePtr = NULL;
int duplicated, code;
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)++;
}
varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
flags, index);
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)--;
}
if (varValuePtr == NULL) {
varValuePtr = Tcl_NewIntObj(0);
}
if (Tcl_IsShared(varValuePtr)) {
duplicated = 1;
varValuePtr = Tcl_DuplicateObj(varValuePtr);
} else {
duplicated = 0;
}
code = TclIncrObj(interp, varValuePtr, incrPtr);
if (code == TCL_OK) {
newValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr,
part2Ptr, varValuePtr, flags, index);
} else if (duplicated) {
Tcl_DecrRefCount(varValuePtr);
}
return newValuePtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_UnsetVar --
*
* Delete a variable, so that it may not be accessed anymore.
*
* Results:
* Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if
* the variable can't be unset. In the event of an error, if the
* TCL_LEAVE_ERR_MSG flag is set then an error message is left in the
* interp's result.
*
* Side effects:
* If varName is defined as a local or global variable in interp, it is
* deleted.
*
*----------------------------------------------------------------------
*/
int
Tcl_UnsetVar(
Tcl_Interp *interp, /* Command interpreter in which varName is to
* be looked up. */
const char *varName, /* Name of a variable in interp. May be either
* a scalar name or an array name or an
* element in an array. */
int flags) /* OR-ed combination of any of
* TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY or
* TCL_LEAVE_ERR_MSG. */
{
return Tcl_UnsetVar2(interp, varName, NULL, flags);
}
/*
*----------------------------------------------------------------------
*
* Tcl_UnsetVar2 --
*
* Delete a variable, given a 2-part name.
*
* Results:
* Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if
* the variable can't be unset. In the event of an error, if the
* TCL_LEAVE_ERR_MSG flag is set then an error message is left in the
* interp's result.
*
* Side effects:
* If part1 and part2 indicate a local or global variable in interp, it
* is deleted. If part1 is an array name and part2 is NULL, then the
* whole array is deleted.
*
*----------------------------------------------------------------------
*/
int
Tcl_UnsetVar2(
Tcl_Interp *interp, /* Command interpreter in which varName is to
* be looked up. */
const char *part1, /* Name of variable or array. */
const char *part2, /* Name of element within array or NULL. */
int flags) /* OR-ed combination of any of
* TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_LEAVE_ERR_MSG. */
{
int result;
Tcl_Obj *part1Ptr, *part2Ptr = NULL;
part1Ptr = Tcl_NewStringObj(part1, -1);
Tcl_IncrRefCount(part1Ptr);
if (part2) {
part2Ptr = Tcl_NewStringObj(part2, -1);
Tcl_IncrRefCount(part2Ptr);
}
/*
* Filter to pass through only the flags this interface supports.
*/
flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG);
result = TclObjUnsetVar2(interp, part1Ptr, part2Ptr, flags);
Tcl_DecrRefCount(part1Ptr);
if (part2Ptr) {
Tcl_DecrRefCount(part2Ptr);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* TclObjUnsetVar2 --
*
* Delete a variable, given a 2-object name.
*
* Results:
* Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if
* the variable can't be unset. In the event of an error, if the
* TCL_LEAVE_ERR_MSG flag is set then an error message is left in the
* interp's result.
*
* Side effects:
* If part1ptr and part2Ptr indicate a local or global variable in
* interp, it is deleted. If part1Ptr is an array name and part2Ptr is
* NULL, then the whole array is deleted.
*
*----------------------------------------------------------------------
*/
int
TclObjUnsetVar2(
Tcl_Interp *interp, /* Command interpreter in which varName is to
* be looked up. */
Tcl_Obj *part1Ptr, /* Name of variable or array. */
Tcl_Obj *part2Ptr, /* Name of element within array or NULL. */
int flags) /* OR-ed combination of any of
* TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_LEAVE_ERR_MSG. */
{
Var *varPtr;
Interp *iPtr = (Interp *) interp;
Var *arrayPtr;
int result;
varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "unset",
/*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
if (varPtr == NULL) {
return TCL_ERROR;
}
result = (TclIsVarUndefined(varPtr)? TCL_ERROR : TCL_OK);
/*
* Keep the variable alive until we're done with it. We used to
* increase/decrease the refCount for each operation, making it hard to
* find [Bug 735335] - caused by unsetting the variable whose value was
* the variable's name.
*/
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)++;
}
UnsetVarStruct(varPtr, arrayPtr, iPtr, part1Ptr, part2Ptr, flags);
/*
* It's an error to unset an undefined variable.
*/
if (result != TCL_OK) {
if (flags & TCL_LEAVE_ERR_MSG) {
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, "unset",
((arrayPtr == NULL) ? noSuchVar : noSuchElement), -1);
}
}
#if ENABLE_NS_VARNAME_CACHING
/*
* Try to avoid keeping the Var struct allocated due to a tclNsVarNameType
* keeping a reference. This removes some additional exteriorisations of
* [Bug 736729], but may be a good thing independently of the bug.
*/
if (part1Ptr->typePtr == &tclNsVarNameType) {
TclFreeIntRep(part1Ptr);
part1Ptr->typePtr = NULL;
}
#endif
/*
* Finally, if the variable is truly not in use then free up its Var
* structure and remove it from its hash table, if any. The ref count of
* its value object, if any, was decremented above.
*/
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)--;
CleanupVar(varPtr, arrayPtr);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* UnsetVarStruct --
*
* Unset and delete a variable. This does the internal work for
* TclObjUnsetVar2 and TclDeleteNamespaceVars, which call here for each
* variable to be unset and deleted.
*
* Results:
* None.
*
* Side effects:
* If the arguments indicate a local or global variable in iPtr, it is
* unset and deleted.
*
*----------------------------------------------------------------------
*/
static void
UnsetVarStruct(
Var *varPtr,
Var *arrayPtr,
Interp *iPtr,
Tcl_Obj *part1Ptr,
Tcl_Obj *part2Ptr,
int flags)
{
Var dummyVar;
int traced = TclIsVarTraced(varPtr)
|| (arrayPtr && (arrayPtr->flags & VAR_TRACED_UNSET));
if (arrayPtr && (arrayPtr->flags & VAR_SEARCH_ACTIVE)) {
DeleteSearches(iPtr, arrayPtr);
} else if (varPtr->flags & VAR_SEARCH_ACTIVE) {
DeleteSearches(iPtr, varPtr);
}
/*
* The code below is tricky, because of the possibility that a trace
* function might try to access a variable being deleted. To handle this
* situation gracefully, do things in three steps:
* 1. Copy the contents of the variable to a dummy variable structure, and
* mark the original Var structure as undefined.
* 2. Invoke traces and clean up the variable, using the dummy copy.
* 3. If at the end of this the original variable is still undefined and
* has no outstanding references, then delete it (but it could have
* gotten recreated by a trace).
*/
dummyVar = *varPtr;
dummyVar.flags &= ~VAR_ALL_HASH;
TclSetVarUndefined(varPtr);
/*
* Call trace functions for the variable being deleted. Then delete its
* traces. Be sure to abort any other traces for the variable that are
* still pending. Special tricks:
* 1. We need to increment varPtr's refCount around this: TclCallVarTraces
* will use dummyVar so it won't increment varPtr's refCount itself.
* 2. Turn off the VAR_TRACE_ACTIVE flag in dummyVar: we want to call
* unset traces even if other traces are pending.
*/
if (traced) {
VarTrace *tracePtr = NULL;
Tcl_HashEntry *tPtr = NULL;
if (TclIsVarTraced(&dummyVar)) {
/*
* Transfer any existing traces on var, IF there are unset traces.
* Otherwise just delete them.
*/
int isNew;
Tcl_HashEntry *tPtr =
Tcl_FindHashEntry(&iPtr->varTraces, (char *) varPtr);
tracePtr = Tcl_GetHashValue(tPtr);
varPtr->flags &= ~VAR_ALL_TRACES;
Tcl_DeleteHashEntry(tPtr);
if (dummyVar.flags & VAR_TRACED_UNSET) {
tPtr = Tcl_CreateHashEntry(&iPtr->varTraces,
(char *) &dummyVar, &isNew);
Tcl_SetHashValue(tPtr, tracePtr);
} else {
tPtr = NULL;
}
}
if ((dummyVar.flags & VAR_TRACED_UNSET)
|| (arrayPtr && (arrayPtr->flags & VAR_TRACED_UNSET))) {
dummyVar.flags &= ~VAR_TRACE_ACTIVE;
TclObjCallVarTraces(iPtr, arrayPtr, &dummyVar, part1Ptr, part2Ptr,
(flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY))
| TCL_TRACE_UNSETS,
/* leaveErrMsg */ 0, -1);
/*
* The traces that we just called may have triggered a change in
* the set of traces. [Bug 2629338]
*/
tracePtr = NULL;
if (TclIsVarTraced(&dummyVar)) {
tPtr = Tcl_FindHashEntry(&iPtr->varTraces, (char *) &dummyVar);
tracePtr = Tcl_GetHashValue(tPtr);
}
if (tPtr) {
Tcl_DeleteHashEntry(tPtr);
}
}
if (tracePtr) {
ActiveVarTrace *activePtr;
while (tracePtr) {
VarTrace *prevPtr = tracePtr;
tracePtr = tracePtr->nextPtr;
prevPtr->nextPtr = NULL;
Tcl_EventuallyFree((ClientData) prevPtr, TCL_DYNAMIC);
}
for (activePtr = iPtr->activeVarTracePtr; activePtr != NULL;
activePtr = activePtr->nextPtr) {
if (activePtr->varPtr == varPtr) {
activePtr->nextTracePtr = NULL;
}
}
dummyVar.flags &= ~VAR_ALL_TRACES;
}
}
if (TclIsVarScalar(&dummyVar) && (dummyVar.value.objPtr != NULL)) {
/*
* Decrement the ref count of the var's value.
*/
Tcl_Obj *objPtr = dummyVar.value.objPtr;
TclDecrRefCount(objPtr);
} else if (TclIsVarArray(&dummyVar)) {
/*
* If the variable is an array, delete all of its elements. This must
* be done after calling and deleting the traces on the array, above
* (that's the way traces are defined). If the array name is not
* present and is required for a trace on some element, it will be
* computed at DeleteArray.
*/
DeleteArray(iPtr, part1Ptr, (Var *) &dummyVar, (flags
& (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_UNSETS);
} else if (TclIsVarLink(&dummyVar)) {
/*
* For global/upvar variables referenced in procedures, decrement the
* reference count on the variable referred to, and free the
* referenced variable if it's no longer needed.
*/
Var *linkPtr = dummyVar.value.linkPtr;
if (TclIsVarInHash(linkPtr)) {
VarHashRefCount(linkPtr)--;
CleanupVar(linkPtr, NULL);
}
}
/*
* If the variable was a namespace variable, decrement its reference
* count.
*/
TclClearVarNamespaceVar(varPtr);
}
/*
*----------------------------------------------------------------------
*
* Tcl_UnsetObjCmd --
*
* This object-based function is invoked to process the "unset" Tcl
* command. See the user documentation for details on what it does.
*
* Results:
* A standard Tcl object result value.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_UnsetObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
register int i, flags = TCL_LEAVE_ERR_MSG;
register char *name;
if (objc == 1) {
/*
* Do nothing if no arguments supplied, so as to match command
* documentation.
*/
return TCL_OK;
}
/*
* Simple, restrictive argument parsing. The only options are -- and
* -nocomplain (which must come first and be given exactly to be an
* option).
*/
i = 1;
name = TclGetString(objv[i]);
if (name[0] == '-') {
if (strcmp("-nocomplain", name) == 0) {
i++;
if (i == objc) {
return TCL_OK;
}
flags = 0;
name = TclGetString(objv[i]);
}
if (strcmp("--", name) == 0) {
i++;
}
}
for (; i < objc; i++) {
if ((TclObjUnsetVar2(interp, objv[i], NULL, flags) != TCL_OK)
&& (flags == TCL_LEAVE_ERR_MSG)) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_AppendObjCmd --
*
* This object-based function is invoked to process the "append" Tcl
* command. See the user documentation for details on what it does.
*
* Results:
* A standard Tcl object result value.
*
* Side effects:
* A variable's value may be changed.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_AppendObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Var *varPtr, *arrayPtr;
register Tcl_Obj *varValuePtr = NULL;
/* Initialized to avoid compiler warning. */
int i;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?");
return TCL_ERROR;
}
if (objc == 2) {
varValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL,TCL_LEAVE_ERR_MSG);
if (varValuePtr == NULL) {
return TCL_ERROR;
}
} else {
varPtr = TclObjLookupVarEx(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG,
"set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
if (varPtr == NULL) {
return TCL_ERROR;
}
for (i=2 ; i<objc ; i++) {
/*
* Note that we do not need to increase the refCount of the Var
* pointers: should a trace delete the variable, the return value
* of TclPtrSetVar will be NULL, and we will not access the
* variable again.
*/
varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1],
NULL, objv[i], TCL_APPEND_VALUE|TCL_LEAVE_ERR_MSG, -1);
if (varValuePtr == NULL) {
return TCL_ERROR;
}
}
}
Tcl_SetObjResult(interp, varValuePtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_LappendObjCmd --
*
* This object-based function is invoked to process the "lappend" Tcl
* command. See the user documentation for details on what it does.
*
* Results:
* A standard Tcl object result value.
*
* Side effects:
* A variable's value may be changed.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_LappendObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Obj *varValuePtr, *newValuePtr;
int numElems, createdNewObj;
Var *varPtr, *arrayPtr;
int result;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?");
return TCL_ERROR;
}
if (objc == 2) {
newValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL, 0);
if (newValuePtr == NULL) {
/*
* The variable doesn't exist yet. Just create it with an empty
* initial value.
*/
TclNewObj(varValuePtr);
newValuePtr = Tcl_ObjSetVar2(interp, objv[1], NULL, varValuePtr,
TCL_LEAVE_ERR_MSG);
if (newValuePtr == NULL) {
return TCL_ERROR;
}
} else {
result = TclListObjLength(interp, newValuePtr, &numElems);
if (result != TCL_OK) {
return result;
}
}
} else {
/*
* We have arguments to append. We used to call Tcl_SetVar2 to append
* each argument one at a time to ensure that traces were run for each
* append step. We now append the arguments all at once because it's
* faster. Note that a read trace and a write trace for the variable
* will now each only be called once. Also, if the variable's old
* value is unshared we modify it directly, otherwise we create a new
* copy to modify: this is "copy on write".
*/
createdNewObj = 0;
/*
* Protect the variable pointers around the TclPtrGetVar call
* to insure that they remain valid even if the variable was undefined
* and unused.
*/
varPtr = TclObjLookupVarEx(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG,
"set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
if (varPtr == NULL) {
return TCL_ERROR;
}
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)++;
}
if (arrayPtr && TclIsVarInHash(arrayPtr)) {
VarHashRefCount(arrayPtr)++;
}
varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, objv[1], NULL,
TCL_LEAVE_ERR_MSG, -1);
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)--;
}
if (arrayPtr && TclIsVarInHash(arrayPtr)) {
VarHashRefCount(arrayPtr)--;
}
if (varValuePtr == NULL) {
/*
* We couldn't read the old value: either the var doesn't yet
* exist or it's an array element. If it's new, we will try to
* create it with Tcl_ObjSetVar2 below.
*/
TclNewObj(varValuePtr);
createdNewObj = 1;
} else if (Tcl_IsShared(varValuePtr)) {
varValuePtr = Tcl_DuplicateObj(varValuePtr);
createdNewObj = 1;
}
result = TclListObjLength(interp, varValuePtr, &numElems);
if (result == TCL_OK) {
result = Tcl_ListObjReplace(interp, varValuePtr, numElems, 0,
(objc-2), (objv+2));
}
if (result != TCL_OK) {
if (createdNewObj) {
TclDecrRefCount(varValuePtr); /* Free unneeded obj. */
}
return result;
}
/*
* Now store the list object back into the variable. If there is an
* error setting the new value, decrement its ref count if it was new
* and we didn't create the variable.
*/
newValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1], NULL,
varValuePtr, TCL_LEAVE_ERR_MSG, -1);
if (newValuePtr == NULL) {
return TCL_ERROR;
}
}
/*
* Set the interpreter's object result to refer to the variable's value
* object.
*/
Tcl_SetObjResult(interp, newValuePtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ArrayObjCmd --
*
* This object-based function is invoked to process the "array" Tcl
* command. See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result object.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_ArrayObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
/*
* The list of constants below should match the arrayOptions string array
* below.
*/
enum {
ARRAY_ANYMORE, ARRAY_DONESEARCH, ARRAY_EXISTS, ARRAY_GET,
ARRAY_NAMES, ARRAY_NEXTELEMENT, ARRAY_SET, ARRAY_SIZE,
ARRAY_STARTSEARCH, ARRAY_STATISTICS, ARRAY_UNSET
};
static const char *arrayOptions[] = {
"anymore", "donesearch", "exists", "get", "names", "nextelement",
"set", "size", "startsearch", "statistics", "unset", NULL
};
Interp *iPtr = (Interp *) interp;
Var *varPtr, *arrayPtr;
Tcl_HashEntry *hPtr;
Tcl_Obj *varNamePtr;
int notArray;
int index, result;
if (objc < 3) {
Tcl_WrongNumArgs(interp, 1, objv, "option arrayName ?arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], arrayOptions, "option",
0, &index) != TCL_OK) {
return TCL_ERROR;
}
/*
* Locate the array variable
*/
varNamePtr = objv[2];
varPtr = TclObjLookupVarEx(interp, varNamePtr, NULL, /*flags*/ 0,
/*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
/*
* Special array trace used to keep the env array in sync for array names,
* array get, etc.
*/
if (varPtr && (varPtr->flags & VAR_TRACED_ARRAY)
&& (TclIsVarArray(varPtr) || TclIsVarUndefined(varPtr))) {
if (TclObjCallVarTraces(iPtr, arrayPtr, varPtr, varNamePtr, NULL,
(TCL_LEAVE_ERR_MSG|TCL_NAMESPACE_ONLY|TCL_GLOBAL_ONLY|
TCL_TRACE_ARRAY), /* leaveErrMsg */ 1, -1) == TCL_ERROR) {
return TCL_ERROR;
}
}
/*
* Verify that it is indeed an array variable. This test comes after the
* traces - the variable may actually become an array as an effect of said
* traces.
*/
notArray = 0;
if ((varPtr == NULL) || !TclIsVarArray(varPtr)
|| TclIsVarUndefined(varPtr)) {
notArray = 1;
}
switch (index) {
case ARRAY_ANYMORE: {
ArraySearch *searchPtr;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName searchId");
return TCL_ERROR;
}
if (notArray) {
goto error;
}
searchPtr = ParseSearchId(interp, varPtr, varNamePtr, objv[3]);
if (searchPtr == NULL) {
return TCL_ERROR;
}
while (1) {
Var *varPtr2;
if (searchPtr->nextEntry != NULL) {
varPtr2 = VarHashGetValue(searchPtr->nextEntry);
if (!TclIsVarUndefined(varPtr2)) {
break;
}
}
searchPtr->nextEntry = Tcl_NextHashEntry(&searchPtr->search);
if (searchPtr->nextEntry == NULL) {
Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[0]);
return TCL_OK;
}
}
Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[1]);
break;
}
case ARRAY_DONESEARCH: {
ArraySearch *searchPtr, *prevPtr;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName searchId");
return TCL_ERROR;
}
if (notArray) {
goto error;
}
searchPtr = ParseSearchId(interp, varPtr, varNamePtr, objv[3]);
if (searchPtr == NULL) {
return TCL_ERROR;
}
hPtr = Tcl_FindHashEntry(&iPtr->varSearches,(char *) varPtr);
if (searchPtr == Tcl_GetHashValue(hPtr)) {
if (searchPtr->nextPtr) {
Tcl_SetHashValue(hPtr, searchPtr->nextPtr);
} else {
varPtr->flags &= ~VAR_SEARCH_ACTIVE;
Tcl_DeleteHashEntry(hPtr);
}
} else {
for (prevPtr=Tcl_GetHashValue(hPtr) ;; prevPtr=prevPtr->nextPtr) {
if (prevPtr->nextPtr == searchPtr) {
prevPtr->nextPtr = searchPtr->nextPtr;
break;
}
}
}
ckfree((char *) searchPtr);
break;
}
case ARRAY_NEXTELEMENT: {
ArraySearch *searchPtr;
Tcl_HashEntry *hPtr;
Var *varPtr2;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName searchId");
return TCL_ERROR;
}
if (notArray) {
goto error;
}
searchPtr = ParseSearchId(interp, varPtr, varNamePtr, objv[3]);
if (searchPtr == NULL) {
return TCL_ERROR;
}
while (1) {
hPtr = searchPtr->nextEntry;
if (hPtr == NULL) {
hPtr = Tcl_NextHashEntry(&searchPtr->search);
if (hPtr == NULL) {
return TCL_OK;
}
} else {
searchPtr->nextEntry = NULL;
}
varPtr2 = VarHashGetValue(hPtr);
if (!TclIsVarUndefined(varPtr2)) {
break;
}
}
Tcl_SetObjResult(interp, VarHashGetKey(varPtr2));
break;
}
case ARRAY_STARTSEARCH: {
ArraySearch *searchPtr;
int isNew;
char *varName = TclGetString(varNamePtr);
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName");
return TCL_ERROR;
}
if (notArray) {
goto error;
}
searchPtr = (ArraySearch *) ckalloc(sizeof(ArraySearch));
hPtr = Tcl_CreateHashEntry(&iPtr->varSearches,
(char *) varPtr, &isNew);
if (isNew) {
searchPtr->id = 1;
Tcl_AppendResult(interp, "s-1-", varName, NULL);
varPtr->flags |= VAR_SEARCH_ACTIVE;
searchPtr->nextPtr = NULL;
} else {
char string[TCL_INTEGER_SPACE];
searchPtr->id = ((ArraySearch *) Tcl_GetHashValue(hPtr))->id + 1;
TclFormatInt(string, searchPtr->id);
Tcl_AppendResult(interp, "s-", string, "-", varName, NULL);
searchPtr->nextPtr = Tcl_GetHashValue(hPtr);
}
searchPtr->varPtr = varPtr;
searchPtr->nextEntry = VarHashFirstEntry(varPtr->value.tablePtr,
&searchPtr->search);
Tcl_SetHashValue(hPtr, searchPtr);
break;
}
case ARRAY_EXISTS:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName");
return TCL_ERROR;
}
Tcl_SetObjResult(interp, iPtr->execEnvPtr->constants[!notArray]);
break;
case ARRAY_GET: {
Tcl_HashSearch search;
Var *varPtr2;
char *pattern = NULL;
char *name;
Tcl_Obj *namePtr, *valuePtr, *nameLstPtr, *tmpResPtr, **namePtrPtr;
int i, count;
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?");
return TCL_ERROR;
}
if (notArray) {
return TCL_OK;
}
if (objc == 4) {
pattern = TclGetString(objv[3]);
}
/*
* Store the array names in a new object.
*/
TclNewObj(nameLstPtr);
Tcl_IncrRefCount(nameLstPtr);
if ((pattern != NULL) && TclMatchIsTrivial(pattern)) {
varPtr2 = VarHashFindVar(varPtr->value.tablePtr, objv[3]);
if (varPtr2 == NULL) {
goto searchDone;
}
if (TclIsVarUndefined(varPtr2)) {
goto searchDone;
}
result = Tcl_ListObjAppendElement(interp, nameLstPtr,
VarHashGetKey(varPtr2));
if (result != TCL_OK) {
TclDecrRefCount(nameLstPtr);
return result;
}
goto searchDone;
}
for (varPtr2 = VarHashFirstVar(varPtr->value.tablePtr, &search);
varPtr2; varPtr2 = VarHashNextVar(&search)) {
if (TclIsVarUndefined(varPtr2)) {
continue;
}
namePtr = VarHashGetKey(varPtr2);
name = TclGetString(namePtr);
if ((objc == 4) && !Tcl_StringMatch(name, pattern)) {
continue; /* Element name doesn't match pattern. */
}
result = Tcl_ListObjAppendElement(interp, nameLstPtr, namePtr);
if (result != TCL_OK) {
TclDecrRefCount(nameLstPtr);
return result;
}
}
searchDone:
/*
* Make sure the Var structure of the array is not removed by a trace
* while we're working.
*/
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)++;
}
/*
* Get the array values corresponding to each element name.
*/
TclNewObj(tmpResPtr);
result = Tcl_ListObjGetElements(interp, nameLstPtr, &count,
&namePtrPtr);
if (result != TCL_OK) {
goto errorInArrayGet;
}
for (i=0 ; i<count ; i++) {
namePtr = *namePtrPtr++;
valuePtr = Tcl_ObjGetVar2(interp, objv[2], namePtr,
TCL_LEAVE_ERR_MSG);
if (valuePtr == NULL) {
/*
* Some trace played a trick on us; we need to diagnose to
* adapt our behaviour: was the array element unset, or did
* the modification modify the complete array?
*/
if (TclIsVarArray(varPtr)) {
/*
* The array itself looks OK, the variable was undefined:
* forget it.
*/
continue;
} else {
result = TCL_ERROR;
goto errorInArrayGet;
}
}
result = Tcl_DictObjPut(interp, tmpResPtr, namePtr, valuePtr);
if (result != TCL_OK) {
goto errorInArrayGet;
}
}
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)--;
}
Tcl_SetObjResult(interp, tmpResPtr);
TclDecrRefCount(nameLstPtr);
break;
errorInArrayGet:
if (TclIsVarInHash(varPtr)) {
VarHashRefCount(varPtr)--;
}
TclDecrRefCount(nameLstPtr);
TclDecrRefCount(tmpResPtr); /* Free unneeded temp result. */
return result;
}
case ARRAY_NAMES: {
Tcl_HashSearch search;
Var *varPtr2;
char *pattern;
char *name;
Tcl_Obj *namePtr, *resultPtr, *patternPtr;
int mode, matched = 0;
static const char *options[] = {
"-exact", "-glob", "-regexp", NULL
};
enum options { OPT_EXACT, OPT_GLOB, OPT_REGEXP };
mode = OPT_GLOB;
if ((objc < 3) || (objc > 5)) {
Tcl_WrongNumArgs(interp, 2,objv, "arrayName ?mode? ?pattern?");
return TCL_ERROR;
}
if (notArray) {
return TCL_OK;
}
if (objc == 4) {
patternPtr = objv[3];
pattern = TclGetString(patternPtr);
} else if (objc == 5) {
patternPtr = objv[4];
pattern = TclGetString(patternPtr);
if (Tcl_GetIndexFromObj(interp, objv[3], options, "option", 0,
&mode) != TCL_OK) {
return TCL_ERROR;
}
} else {
patternPtr = NULL;
pattern = NULL;
}
TclNewObj(resultPtr);
if (((enum options) mode)==OPT_GLOB && pattern!=NULL &&
TclMatchIsTrivial(pattern)) {
varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternPtr);
if ((varPtr2 != NULL) && !TclIsVarUndefined(varPtr2)) {
result = Tcl_ListObjAppendElement(interp, resultPtr,
VarHashGetKey(varPtr2));
if (result != TCL_OK) {
TclDecrRefCount(resultPtr);
return result;
}
}
Tcl_SetObjResult(interp, resultPtr);
return TCL_OK;
}
for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search);
varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) {
if (TclIsVarUndefined(varPtr2)) {
continue;
}
namePtr = VarHashGetKey(varPtr2);
name = TclGetString(namePtr);
if (objc > 3) {
switch ((enum options) mode) {
case OPT_EXACT:
matched = (strcmp(name, pattern) == 0);
break;
case OPT_GLOB:
matched = Tcl_StringMatch(name, pattern);
break;
case OPT_REGEXP:
matched = Tcl_RegExpMatch(interp, name, pattern);
if (matched < 0) {
TclDecrRefCount(resultPtr);
return TCL_ERROR;
}
break;
}
if (matched == 0) {
continue;
}
}
result = Tcl_ListObjAppendElement(interp, resultPtr, namePtr);
if (result != TCL_OK) {
TclDecrRefCount(namePtr); /* Free unneeded name obj. */
return result;
}
}
Tcl_SetObjResult(interp, resultPtr);
break;
}
case ARRAY_SET:
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName list");
return TCL_ERROR;
}
return TclArraySet(interp, objv[2], objv[3]);
case ARRAY_UNSET:
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?");
return TCL_ERROR;
}
if (notArray) {
return TCL_OK;
}
if (objc == 3) {
/*
* When no pattern is given, just unset the whole array.
*/
return TclObjUnsetVar2(interp, varNamePtr, NULL, 0);
} else {
Tcl_HashSearch search;
Var *varPtr2, *protectedVarPtr;
const char *pattern = TclGetString(objv[3]);
/*
* With a trivial pattern, we can just unset.
*/
if (TclMatchIsTrivial(pattern)) {
varPtr2 = VarHashFindVar(varPtr->value.tablePtr, objv[3]);
if (varPtr2 != NULL && !TclIsVarUndefined(varPtr2)) {
return TclObjUnsetVar2(interp, varNamePtr, objv[3], 0);
}
return TCL_OK;
}
/*
* 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 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 (!TclIsVarUndefined(varPtr2)) {
Tcl_Obj *namePtr = VarHashGetKey(varPtr2);
if (Tcl_StringMatch(TclGetString(namePtr), pattern)
&& TclObjUnsetVar2(interp, varNamePtr, namePtr,
0) != 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;
}
} else {
CleanupVar(varPtr2, varPtr);
}
}
break;
}
case ARRAY_SIZE: {
Tcl_HashSearch search;
Var *varPtr2;
int size;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "arrayName");
return TCL_ERROR;
}
size = 0;
/*
* Must iterate in order to get chance to check for present but
* "undefined" entries.
*/
if (!notArray) {
for (varPtr2=VarHashFirstVar(varPtr->value.tablePtr, &search);
varPtr2!=NULL ; varPtr2=VarHashNextVar(&search)) {
if (TclIsVarUndefined(varPtr2)) {
continue;
}
size++;
}
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(size));
break;
}
case ARRAY_STATISTICS: {
const char *stats;
if (notArray) {
goto error;
}
stats = Tcl_HashStats((Tcl_HashTable *) varPtr->value.tablePtr);
if (stats != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(stats, -1));
ckfree((void *)stats);
} else {
Tcl_SetResult(interp,"error reading array statistics",TCL_STATIC);
return TCL_ERROR;
}
break;
}
}
return TCL_OK;
error:
Tcl_AppendResult(interp, "\"", TclGetString(varNamePtr),
"\" isn't an array", NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* TclArraySet --
*
* Set the elements of an array. If there are no elements to set, create
* an empty array. This routine is used by the Tcl_ArrayObjCmd and by the
* TclSetupEnv routine.
*
* Results:
* A standard Tcl result object.
*
* Side effects:
* A variable will be created if one does not already exist.
*
*----------------------------------------------------------------------
*/
int
TclArraySet(
Tcl_Interp *interp, /* Current interpreter. */
Tcl_Obj *arrayNameObj, /* The array name. */
Tcl_Obj *arrayElemObj) /* The array elements list or dict. If this is
* NULL, create an empty array. */
{
Var *varPtr, *arrayPtr;
int result, i;
varPtr = TclObjLookupVarEx(interp, arrayNameObj, NULL,
/*flags*/ TCL_LEAVE_ERR_MSG, /*msg*/ "set", /*createPart1*/ 1,
/*createPart2*/ 1, &arrayPtr);
if (varPtr == NULL) {
return TCL_ERROR;
}
if (arrayPtr) {
CleanupVar(varPtr, arrayPtr);
TclObjVarErrMsg(interp, arrayNameObj, NULL, "set", needArray, -1);
return TCL_ERROR;
}
if (arrayElemObj == NULL) {
goto ensureArray;
}
/*
* Install the contents of the dictionary or list into the array.
*/
if (arrayElemObj->typePtr == &tclDictType) {
Tcl_Obj *keyPtr, *valuePtr;
Tcl_DictSearch search;
int done;
if (Tcl_DictObjSize(interp, arrayElemObj, &done) != TCL_OK) {
return TCL_ERROR;
}
if (done == 0) {
/*
* Empty, so we'll just force the array to be properly existing
* instead.
*/
goto ensureArray;
}
/*
* Don't need to look at result of Tcl_DictObjFirst as we've just
* successfully used a dictionary operation on the same object.
*/
for (Tcl_DictObjFirst(interp, arrayElemObj, &search,
&keyPtr, &valuePtr, &done) ; !done ;
Tcl_DictObjNext(&search, &keyPtr, &valuePtr, &done)) {
/*
* At this point, it would be nice if the key was directly usable
* by the array. This isn't the case though.
*/
Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj,
keyPtr, TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1);
if ((elemVarPtr == NULL) ||
(TclPtrSetVar(interp, elemVarPtr, varPtr, arrayNameObj,
keyPtr, valuePtr, TCL_LEAVE_ERR_MSG, -1) == NULL)) {
Tcl_DictObjDone(&search);
return TCL_ERROR;
}
}
return TCL_OK;
} else {
/*
* Not a dictionary, so assume (and convert to, for backward-
* -compatability reasons) a list.
*/
int elemLen;
Tcl_Obj **elemPtrs, *copyListObj;
result = TclListObjGetElements(interp, arrayElemObj,
&elemLen, &elemPtrs);
if (result != TCL_OK) {
return result;
}
if (elemLen & 1) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"list must have an even number of elements", -1));
return TCL_ERROR;
}
if (elemLen == 0) {
goto ensureArray;
}
/*
* We needn't worry about traces invalidating arrayPtr: should that be
* the case, TclPtrSetVar will return NULL so that we break out of the
* loop and return an error.
*/
copyListObj = TclListObjCopy(NULL, arrayElemObj);
for (i=0 ; i<elemLen ; i+=2) {
Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj,
elemPtrs[i], TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1);
if ((elemVarPtr == NULL) ||
(TclPtrSetVar(interp, elemVarPtr, varPtr, arrayNameObj,
elemPtrs[i],elemPtrs[i+1],TCL_LEAVE_ERR_MSG,-1) == NULL)){
result = TCL_ERROR;
break;
}
}
Tcl_DecrRefCount(copyListObj);
return result;
}
/*
* The list is empty make sure we have an array, or create one if
* necessary.
*/
ensureArray:
if (varPtr != NULL) {
if (TclIsVarArray(varPtr)) {
/*
* Already an array, done.
*/
return TCL_OK;
}
if (TclIsVarArrayElement(varPtr) || !TclIsVarUndefined(varPtr)) {
/*
* Either an array element, or a scalar: lose!
*/
TclObjVarErrMsg(interp, arrayNameObj, NULL, "array set",
needArray, -1);
return TCL_ERROR;
}
}
TclSetVarArray(varPtr);
varPtr->value.tablePtr = (TclVarHashTable *)
ckalloc(sizeof(TclVarHashTable));
TclInitVarHashTable(varPtr->value.tablePtr, TclGetVarNsPtr(varPtr));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ObjMakeUpvar --
*
* This function does all of the work of the "global" and "upvar"
* commands.
*
* Results:
* A standard Tcl completion code. If an error occurs then an error
* message is left in iPtr->result.
*
* Side effects:
* The variable given by myName is linked to the variable in framePtr
* given by otherP1 and otherP2, so that references to myName are
* redirected to the other variable like a symbolic link.
*
*----------------------------------------------------------------------
*/
static int
ObjMakeUpvar(
Tcl_Interp *interp, /* Interpreter containing variables. Used for
* error messages, too. */
CallFrame *framePtr, /* Call frame containing "other" variable.
* NULL means use global :: context. */
Tcl_Obj *otherP1Ptr,
const char *otherP2, /* Two-part name of variable in framePtr. */
const int otherFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of "other" variable. */
Tcl_Obj *myNamePtr, /* Name of variable which will refer to
* otherP1/otherP2. Must be a scalar. */
int myFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of myName. */
int index) /* If the variable to be linked is an indexed
* scalar, this is its index. Otherwise, -1 */
{
Interp *iPtr = (Interp *) interp;
Var *otherPtr, *arrayPtr;
CallFrame *varFramePtr;
/*
* Find "other" in "framePtr". If not looking up other in just the current
* namespace, temporarily replace the current var frame pointer in the
* interpreter in order to use TclObjLookupVar.
*/
if (framePtr == NULL) {
framePtr = iPtr->rootFramePtr;
}
varFramePtr = iPtr->varFramePtr;
if (!(otherFlags & TCL_NAMESPACE_ONLY)) {
iPtr->varFramePtr = framePtr;
}
otherPtr = TclObjLookupVar(interp, otherP1Ptr, otherP2,
(otherFlags | TCL_LEAVE_ERR_MSG), "access",
/*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
if (!(otherFlags & TCL_NAMESPACE_ONLY)) {
iPtr->varFramePtr = varFramePtr;
}
if (otherPtr == NULL) {
return TCL_ERROR;
}
/*
* Check that we are not trying to create a namespace var linked to a
* local variable in a procedure. If we allowed this, the local
* variable in the shorter-lived procedure frame could go away leaving
* the namespace var's reference invalid.
*/
if (index < 0) {
if (!(arrayPtr != NULL
? (TclIsVarInHash(arrayPtr) && TclGetVarNsPtr(arrayPtr))
: (TclIsVarInHash(otherPtr) && TclGetVarNsPtr(otherPtr)))
&& ((myFlags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY))
|| (varFramePtr == NULL)
|| !HasLocalVars(varFramePtr)
|| (strstr(TclGetString(myNamePtr), "::") != NULL))) {
Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
TclGetString(myNamePtr), "\": upvar won't create "
"namespace variable that refers to procedure variable",
NULL);
return TCL_ERROR;
}
}
return TclPtrObjMakeUpvar(interp, otherPtr, myNamePtr, myFlags, index);
}
/*
*----------------------------------------------------------------------
*
* TclPtrMakeUpvar --
*
* This procedure does all of the work of the "global" and "upvar"
* commands.
*
* Results:
* A standard Tcl completion code. If an error occurs then an error
* message is left in iPtr->result.
*
* Side effects:
* The variable given by myName is linked to the variable in framePtr
* given by otherP1 and otherP2, so that references to myName are
* redirected to the other variable like a symbolic link.
*
*----------------------------------------------------------------------
*/
int
TclPtrMakeUpvar(
Tcl_Interp *interp, /* Interpreter containing variables. Used for
* error messages, too. */
Var *otherPtr, /* Pointer to the variable being linked-to. */
const char *myName, /* Name of variable which will refer to
* otherP1/otherP2. Must be a scalar. */
int myFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of myName. */
int index) /* If the variable to be linked is an indexed
* scalar, this is its index. Otherwise, -1 */
{
Tcl_Obj *myNamePtr;
int result;
if (myName) {
myNamePtr = Tcl_NewStringObj(myName, -1);
Tcl_IncrRefCount(myNamePtr);
} else {
myNamePtr = NULL;
}
result = TclPtrObjMakeUpvar(interp, otherPtr, myNamePtr, myFlags, index);
if (myNamePtr) {
Tcl_DecrRefCount(myNamePtr);
}
return result;
}
int
TclPtrObjMakeUpvar(
Tcl_Interp *interp, /* Interpreter containing variables. Used for
* error messages, too. */
Var *otherPtr, /* Pointer to the variable being linked-to. */
Tcl_Obj *myNamePtr, /* Name of variable which will refer to
* otherP1/otherP2. Must be a scalar. */
int myFlags, /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of myName. */
int index) /* If the variable to be linked is an indexed
* scalar, this is its index. Otherwise, -1 */
{
Interp *iPtr = (Interp *) interp;
CallFrame *varFramePtr = iPtr->varFramePtr;
const char *errMsg, *p, *myName;
Var *varPtr;
if (index >= 0) {
if (!HasLocalVars(varFramePtr)) {
Tcl_Panic("ObjMakeUpvar called with an index outside from a proc");
}
varPtr = (Var *) &(varFramePtr->compiledLocals[index]);
myNamePtr = localName(iPtr->varFramePtr, index);
myName = myNamePtr? TclGetString(myNamePtr) : NULL;
} else {
/*
* Do not permit the new variable to look like an array reference, as
* it will not be reachable in that case [Bug 600812, TIP 184]. The
* "definition" of what "looks like an array reference" is consistent
* (and must remain consistent) with the code in TclObjLookupVar().
*/
myName = TclGetString(myNamePtr);
p = strstr(myName, "(");
if (p != NULL) {
p += strlen(p)-1;
if (*p == ')') {
/*
* myName looks like an array reference.
*/
Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
myName, "\": upvar won't create a scalar variable "
"that looks like an array element", NULL);
return TCL_ERROR;
}
}
/*
* Lookup and eventually create the new variable. Set the flag bit
* AVOID_RESOLVERS to indicate the special resolution rules for upvar
* purposes:
* - Bug #696893 - variable is either proc-local or in the current
* namespace; never follow the second (global) resolution path.
* - Bug #631741 - do not use special namespace or interp resolvers.
*/
varPtr = TclLookupSimpleVar(interp, myNamePtr,
myFlags|AVOID_RESOLVERS, /* create */ 1, &errMsg, &index);
if (varPtr == NULL) {
TclObjVarErrMsg(interp, myNamePtr, NULL, "create", errMsg, -1);
return TCL_ERROR;
}
}
if (varPtr == otherPtr) {
Tcl_SetResult((Tcl_Interp *) iPtr,
"can't upvar from variable to itself", TCL_STATIC);
return TCL_ERROR;
}
if (TclIsVarTraced(varPtr)) {
Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
"\" has traces: can't use for upvar", NULL);
return TCL_ERROR;
} else if (!TclIsVarUndefined(varPtr)) {
/*
* The variable already existed. Make sure this variable "varPtr"
* isn't the same as "otherPtr" (avoid circular links). Also, if it's
* not an upvar then it's an error. If it is an upvar, then just
* disconnect it from the thing it currently refers to.
*/
if (TclIsVarLink(varPtr)) {
Var *linkPtr = varPtr->value.linkPtr;
if (linkPtr == otherPtr) {
return TCL_OK;
}
if (TclIsVarInHash(linkPtr)) {
VarHashRefCount(linkPtr)--;
if (TclIsVarUndefined(linkPtr)) {
CleanupVar(linkPtr, NULL);
}
}
} else {
Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
"\" already exists", NULL);
return TCL_ERROR;
}
}
TclSetVarLink(varPtr);
varPtr->value.linkPtr = otherPtr;
if (TclIsVarInHash(otherPtr)) {
VarHashRefCount(otherPtr)++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_UpVar --
*
* This function links one variable to another, just like the "upvar"
* command.
*
* Results:
* A standard Tcl completion code. If an error occurs then an error
* message is left in the interp's result.
*
* Side effects:
* The variable in frameName whose name is given by varName becomes
* accessible under the name localName, so that references to localName
* are redirected to the other variable like a symbolic link.
*
*----------------------------------------------------------------------
*/
int
Tcl_UpVar(
Tcl_Interp *interp, /* Command interpreter in which varName is to
* be looked up. */
const char *frameName, /* Name of the frame containing the source
* variable, such as "1" or "#0". */
const char *varName, /* Name of a variable in interp to link to.
* May be either a scalar name or an element
* in an array. */
const char *localName, /* Name of link variable. */
int flags) /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of localName. */
{
return Tcl_UpVar2(interp, frameName, varName, NULL, localName, flags);
}
/*
*----------------------------------------------------------------------
*
* Tcl_UpVar2 --
*
* This function links one variable to another, just like the "upvar"
* command.
*
* Results:
* A standard Tcl completion code. If an error occurs then an error
* message is left in the interp's result.
*
* Side effects:
* The variable in frameName whose name is given by part1 and part2
* becomes accessible under the name localName, so that references to
* localName are redirected to the other variable like a symbolic link.
*
*----------------------------------------------------------------------
*/
int
Tcl_UpVar2(
Tcl_Interp *interp, /* Interpreter containing variables. Used for
* error messages too. */
const char *frameName, /* Name of the frame containing the source
* variable, such as "1" or "#0". */
const char *part1,
const char *part2, /* Two parts of source variable name to link
* to. */
const char *localName, /* Name of link variable. */
int flags) /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of localName. */
{
int result;
CallFrame *framePtr;
Tcl_Obj *part1Ptr, *localNamePtr;
if (TclGetFrame(interp, frameName, &framePtr) == -1) {
return TCL_ERROR;
}
part1Ptr = Tcl_NewStringObj(part1, -1);
Tcl_IncrRefCount(part1Ptr);
localNamePtr = Tcl_NewStringObj(localName, -1);
Tcl_IncrRefCount(localNamePtr);
result = ObjMakeUpvar(interp, framePtr, part1Ptr, part2, 0,
localNamePtr, flags, -1);
Tcl_DecrRefCount(part1Ptr);
Tcl_DecrRefCount(localNamePtr);
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetVariableFullName --
*
* Given a Tcl_Var token returned by Tcl_FindNamespaceVar, this function
* appends to an object the namespace variable's full name, qualified by
* a sequence of parent namespace names.
*
* Results:
* None.
*
* Side effects:
* The variable's fully-qualified name is appended to the string
* representation of objPtr.
*
*----------------------------------------------------------------------
*/
void
Tcl_GetVariableFullName(
Tcl_Interp *interp, /* Interpreter containing the variable. */
Tcl_Var variable, /* Token for the variable returned by a
* previous call to Tcl_FindNamespaceVar. */
Tcl_Obj *objPtr) /* Points to the object onto which the
* variable's full name is appended. */
{
Interp *iPtr = (Interp *) interp;
register Var *varPtr = (Var *) variable;
Tcl_Obj *namePtr;
Namespace *nsPtr;
/*
* Add the full name of the containing namespace (if any), followed by the
* "::" separator, then the variable name.
*/
if (varPtr) {
if (!TclIsVarArrayElement(varPtr)) {
nsPtr = TclGetVarNsPtr(varPtr);
if (nsPtr) {
Tcl_AppendToObj(objPtr, nsPtr->fullName, -1);
if (nsPtr != iPtr->globalNsPtr) {
Tcl_AppendToObj(objPtr, "::", 2);
}
}
if (TclIsVarInHash(varPtr)) {
if (!TclIsVarDeadHash(varPtr)) {
namePtr = VarHashGetKey(varPtr);
Tcl_AppendObjToObj(objPtr, namePtr);
}
} else if (iPtr->varFramePtr->procPtr) {
int index = varPtr - iPtr->varFramePtr->compiledLocals;
if (index < iPtr->varFramePtr->numCompiledLocals) {
namePtr = localName(iPtr->varFramePtr, index);
Tcl_AppendObjToObj(objPtr, namePtr);
}
}
}
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_GlobalObjCmd --
*
* This object-based function is invoked to process the "global" Tcl
* command. See the user documentation for details on what it does.
*
* Results:
* A standard Tcl object result value.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
int
Tcl_GlobalObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Interp *iPtr = (Interp *) interp;
register Tcl_Obj *objPtr, *tailPtr;
char *varName;
register char *tail;
int result, i;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "varName ?varName ...?");
return TCL_ERROR;
}
/*
* If we are not executing inside a Tcl procedure, just return.
*/
if (!HasLocalVars(iPtr->varFramePtr)) {
return TCL_OK;
}
for (i=1 ; i<objc ; i++) {
/*
* Make a local variable linked to its counterpart in the global ::
* namespace.
*/
objPtr = objv[i];
varName = TclGetString(objPtr);
/*
* The variable name might have a scope qualifier, but the name for
* the local "link" variable must be the simple name at the tail.
*/
for (tail=varName ; *tail!='\0' ; tail++) {
/* empty body */
}
while ((tail > varName) && ((*tail != ':') || (*(tail-1) != ':'))) {
tail--;
}
if ((*tail == ':') && (tail > varName)) {
tail++;
}
if (tail == varName) {
tailPtr = objPtr;
} else {
tailPtr = Tcl_NewStringObj(tail, -1);
Tcl_IncrRefCount(tailPtr);
}
/*
* Link to the variable "varName" in the global :: namespace.
*/
result = ObjMakeUpvar(interp, NULL, objPtr, NULL,
TCL_GLOBAL_ONLY, /*myName*/ tailPtr, /*myFlags*/ 0, -1);
if (tail != varName) {
Tcl_DecrRefCount(tailPtr);
}
if (result != TCL_OK) {
return result;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_VariableObjCmd --
*
* Invoked to implement the "variable" command that creates one or more
* global variables. Handles the following syntax:
*
* variable ?name value...? name ?value?
*
* One or more variables can be created. The variables are initialized
* with the specified values. The value for the last variable is
* optional.
*
* If the variable does not exist, it is created and given the optional
* value. If it already exists, it is simply set to the optional value.
* Normally, "name" is an unqualified name, so it is created in the
* current namespace. If it includes namespace qualifiers, it can be
* created in another namespace.
*
* If the variable command is executed inside a Tcl procedure, it creates
* a local variable linked to the newly-created namespace variable.
*
* Results:
* Returns TCL_OK if the variable is found or created. Returns TCL_ERROR
* if anything goes wrong.
*
* Side effects:
* If anything goes wrong, this function returns an error message as the
* result in the interpreter's result object.
*
*----------------------------------------------------------------------
*/
int
Tcl_VariableObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Interp *iPtr = (Interp *) interp;
char *varName, *tail, *cp;
Var *varPtr, *arrayPtr;
Tcl_Obj *varValuePtr;
int i, result;
Tcl_Obj *varNamePtr, *tailPtr;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "?name value...? name ?value?");
return TCL_ERROR;
}
for (i=1 ; i<objc ; i+=2) {
/*
* Look up each variable in the current namespace context, creating it
* if necessary.
*/
varNamePtr = objv[i];
varName = TclGetString(varNamePtr);
varPtr = TclObjLookupVarEx(interp, varNamePtr, NULL,
(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), "define",
/*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr);
if (arrayPtr != NULL) {
/*
* Variable cannot be an element in an array. If arrayPtr is
* non-NULL, it is, so throw up an error and return.
*/
TclObjVarErrMsg(interp, varNamePtr, NULL, "define",
isArrayElement, -1);
return TCL_ERROR;
}
if (varPtr == NULL) {
return TCL_ERROR;
}
/*
* Mark the variable as a namespace variable and increment its
* reference count so that it will persist until its namespace is
* destroyed or until the variable is unset.
*/
TclSetVarNamespaceVar(varPtr);
/*
* If a value was specified, set the variable to that value.
* Otherwise, if the variable is new, leave it undefined. (If the
* variable already exists and no value was specified, leave its value
* unchanged; just create the local link if we're in a Tcl procedure).
*/
if (i+1 < objc) { /* A value was specified. */
varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, varNamePtr,
NULL, objv[i+1], TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG,-1);
if (varValuePtr == NULL) {
return TCL_ERROR;
}
}
/*
* If we are executing inside a Tcl procedure, create a local variable
* linked to the new namespace variable "varName".
*/
if (HasLocalVars(iPtr->varFramePtr)) {
/*
* varName might have a scope qualifier, but the name for the
* local "link" variable must be the simple name at the tail.
*
* Locate tail in one pass: drop any prefix after two *or more*
* consecutive ":" characters).
*/
for (tail=cp=varName ; *cp!='\0' ;) {
if (*cp++ == ':') {
while (*cp == ':') {
tail = ++cp;
}
}
}
/*
* Create a local link "tail" to the variable "varName" in the
* current namespace.
*/
if (tail == varName) {
tailPtr = varNamePtr;
} else {
tailPtr = Tcl_NewStringObj(tail, -1);
Tcl_IncrRefCount(tailPtr);
}
result = ObjMakeUpvar(interp, NULL, varNamePtr, /*otherP2*/ NULL,
/*otherFlags*/ TCL_NAMESPACE_ONLY,
/*myName*/ tailPtr, /*myFlags*/ 0, -1);
if (tail != varName) {
Tcl_DecrRefCount(tailPtr);
}
if (result != TCL_OK) {
return result;
}
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_UpvarObjCmd --
*
* This object-based function is invoked to process the "upvar" Tcl
* command. See the user documentation for details on what it does.
*
* Results:
* A standard Tcl object result value.
*
* Side effects:
* See the user documentation.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_UpvarObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
CallFrame *framePtr;
int result;
if (objc < 3) {
upvarSyntax:
Tcl_WrongNumArgs(interp, 1, objv,
"?level? otherVar localVar ?otherVar localVar ...?");
return TCL_ERROR;
}
/*
* Find the call frame containing each of the "other variables" to be
* linked to.
*/
result = TclObjGetFrame(interp, objv[1], &framePtr);
if (result == -1) {
return TCL_ERROR;
}
objc -= result+1;
if ((objc & 1) != 0) {
goto upvarSyntax;
}
objv += result+1;
/*
* Iterate over each (other variable, local variable) pair. Divide the
* other variable name into two parts, then call MakeUpvar to do all the
* work of linking it to the local variable.
*/
for (; objc>0 ; objc-=2, objv+=2) {
result = ObjMakeUpvar(interp, framePtr, /* othervarName */ objv[0],
NULL, 0, /* myVarName */ objv[1], /*flags*/ 0, -1);
if (result != TCL_OK) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* SetArraySearchObj --
*
* This function converts the given tcl object into one that has the
* "array search" internal type.
*
* Results:
* TCL_OK if the conversion succeeded, and TCL_ERROR if it failed (when
* an error message will be placed in the interpreter's result.)
*
* Side effects:
* Updates the internal type and representation of the object to make
* this an array-search object. See the tclArraySearchType declaration
* above for details of the internal representation.
*
*----------------------------------------------------------------------
*/
static int
SetArraySearchObj(
Tcl_Interp *interp,
Tcl_Obj *objPtr)
{
char *string;
char *end;
int id;
size_t offset;
/*
* Get the string representation. Make it up-to-date if necessary.
*/
string = TclGetString(objPtr);
/*
* Parse the id into the three parts separated by dashes.
*/
if ((string[0] != 's') || (string[1] != '-')) {
goto syntax;
}
id = strtoul(string+2, &end, 10);
if ((end == (string+2)) || (*end != '-')) {
goto syntax;
}
/*
* Can't perform value check in this context, so place reference to place
* in string to use for the check in the object instead.
*/
end++;
offset = end - string;
TclFreeIntRep(objPtr);
objPtr->typePtr = &tclArraySearchType;
objPtr->internalRep.twoPtrValue.ptr1 = INT2PTR(id);
objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(offset);
return TCL_OK;
syntax:
Tcl_AppendResult(interp, "illegal search identifier \"",string,"\"",NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* ParseSearchId --
*
* This function translates from a tcl object to a pointer to an active
* array search (if there is one that matches the string).
*
* Results:
* The return value is a pointer to the array search indicated by string,
* or NULL if there isn't one. If NULL is returned, the interp's result
* contains an error message.
*
* Side effects:
* The tcl object might have its internal type and representation
* modified.
*
*----------------------------------------------------------------------
*/
static ArraySearch *
ParseSearchId(
Tcl_Interp *interp, /* Interpreter containing variable. */
const Var *varPtr, /* Array variable search is for. */
Tcl_Obj *varNamePtr, /* Name of array variable that search is
* supposed to be for. */
Tcl_Obj *handleObj) /* Object containing id of search. Must have
* form "search-num-var" where "num" is a
* decimal number and "var" is a variable
* name. */
{
Interp *iPtr = (Interp *) interp;
register char *string;
register size_t offset;
int id;
ArraySearch *searchPtr;
char *varName = TclGetString(varNamePtr);
/*
* Parse the id.
*/
if (Tcl_ConvertToType(interp, handleObj, &tclArraySearchType) != TCL_OK) {
return NULL;
}
/*
* Extract the information out of the Tcl_Obj.
*/
#if 1
id = PTR2INT(handleObj->internalRep.twoPtrValue.ptr1);
string = TclGetString(handleObj);
offset = PTR2INT(handleObj->internalRep.twoPtrValue.ptr2);
#else
id = (int)(((char *) handleObj->internalRep.twoPtrValue.ptr1) -
((char *) NULL));
string = TclGetString(handleObj);
offset = (((char *) handleObj->internalRep.twoPtrValue.ptr2) -
((char *) NULL));
#endif
/*
* This test cannot be placed inside the Tcl_Obj machinery, since it is
* dependent on the variable context.
*/
if (strcmp(string+offset, varName) != 0) {
Tcl_AppendResult(interp, "search identifier \"", string,
"\" isn't for variable \"", varName, "\"", NULL);
goto badLookup;
}
/*
* Search through the list of active searches on the interpreter to see if
* the desired one exists.
*
* Note that we cannot store the searchPtr directly in the Tcl_Obj as that
* would run into trouble when DeleteSearches() was called so we must scan
* this list every time.
*/
if (varPtr->flags & VAR_SEARCH_ACTIVE) {
Tcl_HashEntry *hPtr =
Tcl_FindHashEntry(&iPtr->varSearches, (char *) varPtr);
for (searchPtr = (ArraySearch *) Tcl_GetHashValue(hPtr);
searchPtr != NULL; searchPtr = searchPtr->nextPtr) {
if (searchPtr->id == id) {
return searchPtr;
}
}
}
Tcl_AppendResult(interp, "couldn't find search \"", string, "\"", NULL);
badLookup:
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAYSEARCH", string, NULL);
return NULL;
}
/*
*----------------------------------------------------------------------
*
* DeleteSearches --
*
* This function is called to free up all of the searches associated
* with an array variable.
*
* Results:
* None.
*
* Side effects:
* Memory is released to the storage allocator.
*
*----------------------------------------------------------------------
*/
static void
DeleteSearches(
Interp *iPtr,
register Var *arrayVarPtr) /* Variable whose searches are to be
* deleted. */
{
ArraySearch *searchPtr, *nextPtr;
Tcl_HashEntry *sPtr;
if (arrayVarPtr->flags & VAR_SEARCH_ACTIVE) {
sPtr = Tcl_FindHashEntry(&iPtr->varSearches, (char *) arrayVarPtr);
for (searchPtr = (ArraySearch *) Tcl_GetHashValue(sPtr);
searchPtr != NULL; searchPtr = nextPtr) {
nextPtr = searchPtr->nextPtr;
ckfree((char *) searchPtr);
}
arrayVarPtr->flags &= ~VAR_SEARCH_ACTIVE;
Tcl_DeleteHashEntry(sPtr);
}
}
/*
*----------------------------------------------------------------------
*
* TclDeleteNamespaceVars --
*
* This function is called to recycle all the storage space associated
* with a namespace's table of variables.
*
* Results:
* None.
*
* Side effects:
* Variables are deleted and trace functions are invoked, if any are
* declared.
*
*----------------------------------------------------------------------
*/
void
TclDeleteNamespaceVars(
Namespace *nsPtr)
{
TclVarHashTable *tablePtr = &nsPtr->varTable;
Tcl_Interp *interp = nsPtr->interp;
Interp *iPtr = (Interp *)interp;
Tcl_HashSearch search;
int flags = 0;
Var *varPtr;
/*
* Determine what flags to pass to the trace callback functions.
*/
if (nsPtr == iPtr->globalNsPtr) {
flags = TCL_GLOBAL_ONLY;
} else if (nsPtr == (Namespace *) TclGetCurrentNamespace(interp)) {
flags = TCL_NAMESPACE_ONLY;
}
for (varPtr = VarHashFirstVar(tablePtr, &search); varPtr != NULL;
varPtr = VarHashFirstVar(tablePtr, &search)) {
Tcl_Obj *objPtr = Tcl_NewObj();
Tcl_IncrRefCount(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);
Tcl_DecrRefCount(objPtr); /* free no longer needed obj */
/*
* Remove the variable from the table and force it undefined in case
* an unset trace brought it back from the dead.
*/
if (TclIsVarTraced(varPtr)) {
ActiveVarTrace *activePtr;
Tcl_HashEntry *tPtr = Tcl_FindHashEntry(&iPtr->varTraces,
(char *) varPtr);
VarTrace *tracePtr = (VarTrace *) Tcl_GetHashValue(tPtr);
while (tracePtr) {
VarTrace *prevPtr = tracePtr;
tracePtr = tracePtr->nextPtr;
prevPtr->nextPtr = NULL;
Tcl_EventuallyFree((ClientData) 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;
}
}
}
VarHashRefCount(varPtr)--;
VarHashDeleteEntry(varPtr);
}
VarHashDeleteTable(tablePtr);
}
/*
*----------------------------------------------------------------------
*
* TclDeleteVars --
*
* This function is called to recycle all the storage space associated
* with a table of variables. For this function to work correctly, it
* must not be possible for any of the variables in the table to be
* accessed from Tcl commands (e.g. from trace functions).
*
* Results:
* None.
*
* Side effects:
* Variables are deleted and trace functions are invoked, if any are
* declared.
*
*----------------------------------------------------------------------
*/
void
TclDeleteVars(
Interp *iPtr, /* Interpreter to which variables belong. */
TclVarHashTable *tablePtr) /* Hash table containing variables to
* delete. */
{
Tcl_Interp *interp = (Tcl_Interp *) iPtr;
Tcl_HashSearch search;
register Var *varPtr;
int flags;
Namespace *currNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
/*
* Determine what flags to pass to the trace callback functions.
*/
flags = TCL_TRACE_UNSETS;
if (tablePtr == &iPtr->globalNsPtr->varTable) {
flags |= TCL_GLOBAL_ONLY;
} else if (tablePtr == &currNsPtr->varTable) {
flags |= TCL_NAMESPACE_ONLY;
}
for (varPtr = VarHashFirstVar(tablePtr, &search); varPtr != NULL;
varPtr = VarHashFirstVar(tablePtr, &search)) {
UnsetVarStruct(varPtr, NULL, iPtr, VarHashGetKey(varPtr), NULL, flags);
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. */
{
register Var *varPtr;
int numLocals, i;
Tcl_Obj **namePtrPtr;
numLocals = framePtr->numCompiledLocals;
varPtr = framePtr->compiledLocals;
namePtrPtr = &localName(framePtr, 0);
for (i=0 ; i<numLocals ; i++, namePtrPtr++, varPtr++) {
UnsetVarStruct(varPtr, NULL, iPtr, *namePtrPtr, NULL,
TCL_TRACE_UNSETS);
}
framePtr->numCompiledLocals = 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. */
{
Tcl_HashSearch search;
Tcl_HashEntry *tPtr;
register Var *elPtr;
ActiveVarTrace *activePtr;
Tcl_Obj *objPtr;
VarTrace *tracePtr;
if (varPtr->flags & VAR_SEARCH_ACTIVE) {
DeleteSearches(iPtr, varPtr);
}
for (elPtr = VarHashFirstVar(varPtr->value.tablePtr, &search);
elPtr != NULL; elPtr = VarHashNextVar(&search)) {
if (TclIsVarScalar(elPtr) && (elPtr->value.objPtr != NULL)) {
objPtr = elPtr->value.objPtr;
TclDecrRefCount(objPtr);
elPtr->value.objPtr = NULL;
}
/*
* Lie about the validity of the hashtable entry. In this way the
* variables will be deleted by VarHashDeleteTable.
*/
VarHashInvalidateEntry(elPtr);
if (TclIsVarTraced(elPtr)) {
/*
* Compute the array name if it was not supplied.
*/
if (elPtr->flags & VAR_TRACED_UNSET) {
Tcl_Obj *elNamePtr = VarHashGetKey(elPtr);
elPtr->flags &= ~VAR_TRACE_ACTIVE;
TclObjCallVarTraces(iPtr, NULL, elPtr, arrayNamePtr,
elNamePtr, flags,/* leaveErrMsg */ 0, -1);
}
tPtr = Tcl_FindHashEntry(&iPtr->varTraces, (char *) elPtr);
tracePtr = (VarTrace *) Tcl_GetHashValue(tPtr);
while (tracePtr) {
VarTrace *prevPtr = tracePtr;
tracePtr = tracePtr->nextPtr;
Tcl_EventuallyFree((ClientData) prevPtr, TCL_DYNAMIC);
}
Tcl_DeleteHashEntry(tPtr);
elPtr->flags &= ~VAR_ALL_TRACES;
for (activePtr = iPtr->activeVarTracePtr; activePtr != NULL;
activePtr = activePtr->nextPtr) {
if (activePtr->varPtr == elPtr) {
activePtr->nextTracePtr = NULL;
}
}
}
TclSetVarUndefined(elPtr);
/*
* Even though array elements are not supposed to be namespace
* variables, some combinations of [upvar] and [variable] may create
* such beasts - see [Bug 604239]. This is necessary to avoid leaking
* the corresponding Var struct, and is otherwise harmless.
*/
TclClearVarNamespaceVar(elPtr);
}
VarHashDeleteTable(varPtr->value.tablePtr);
ckfree((char *) varPtr->value.tablePtr);
}
/*
*----------------------------------------------------------------------
*
* TclTclObjVarErrMsg --
*
* Generate a reasonable error message describing why a variable
* operation failed.
*
* Results:
* None.
*
* Side effects:
* The interp's result is set to hold a message identifying the variable
* given by part1 and part2 and describing why the variable operation
* failed.
*
*----------------------------------------------------------------------
*/
void
TclVarErrMsg(
Tcl_Interp *interp, /* Interpreter in which to record message. */
const char *part1,
const char *part2, /* Variable's two-part name. */
const char *operation, /* String describing operation that failed,
* e.g. "read", "set", or "unset". */
const char *reason) /* String describing why operation failed. */
{
Tcl_Obj *part1Ptr = NULL, *part2Ptr = NULL;
part1Ptr = Tcl_NewStringObj(part1, -1);
Tcl_IncrRefCount(part1Ptr);
if (part2) {
part2Ptr = Tcl_NewStringObj(part2, -1);
Tcl_IncrRefCount(part2Ptr);
} else {
part2 = NULL;
}
TclObjVarErrMsg(interp, part1Ptr, part2Ptr, operation, reason, -1);
Tcl_DecrRefCount(part1Ptr);
if (part2Ptr) {
Tcl_DecrRefCount(part2Ptr);
}
}
void
TclObjVarErrMsg(
Tcl_Interp *interp, /* Interpreter in which to record message. */
Tcl_Obj *part1Ptr, /* (may be NULL, if index >= 0) */
Tcl_Obj *part2Ptr, /* Variable's two-part name. */
const char *operation, /* String describing operation that failed,
* e.g. "read", "set", or "unset". */
const char *reason, /* String describing why operation failed. */
int index) /* Index into the local variable table of the
* variable, or -1. Only used when part1Ptr is
* NULL. */
{
if (!part1Ptr) {
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 --
*
*----------------------------------------------------------------------
*/
/*
* Panic functions that should never be called in normal operation.
*/
static void
PanicOnUpdateVarName(
Tcl_Obj *objPtr)
{
Tcl_Panic("%s of type %s should not be called", "updateStringProc",
objPtr->typePtr->name);
}
static int
PanicOnSetVarName(
Tcl_Interp *interp,
Tcl_Obj *objPtr)
{
Tcl_Panic("%s of type %s should not be called", "setFromAnyProc",
objPtr->typePtr->name);
return TCL_ERROR;
}
/*
* localVarName -
*
* INTERNALREP DEFINITION:
* ptrAndLongRep.ptr: pointer to name obj in varFramePtr->localCache
* or NULL if it is this same obj
* ptrAndLongRep.value: index into locals table
*/
static void
FreeLocalVarName(
Tcl_Obj *objPtr)
{
Tcl_Obj *namePtr = (Tcl_Obj *) objPtr->internalRep.ptrAndLongRep.ptr;
if (namePtr) {
Tcl_DecrRefCount(namePtr);
}
}
static void
DupLocalVarName(
Tcl_Obj *srcPtr,
Tcl_Obj *dupPtr)
{
Tcl_Obj *namePtr = srcPtr->internalRep.ptrAndLongRep.ptr;
if (!namePtr) {
namePtr = srcPtr;
}
dupPtr->internalRep.ptrAndLongRep.ptr = namePtr;
Tcl_IncrRefCount(namePtr);
dupPtr->internalRep.ptrAndLongRep.value =
srcPtr->internalRep.ptrAndLongRep.value;
dupPtr->typePtr = &localVarNameType;
}
#if ENABLE_NS_VARNAME_CACHING
/*
* nsVarName -
*
* INTERNALREP DEFINITION:
* twoPtrValue.ptr1: pointer to the namespace containing the reference.
* twoPtrValue.ptr2: pointer to the corresponding Var
*/
static void
FreeNsVarName(
Tcl_Obj *objPtr)
{
register Var *varPtr = objPtr->internalRep.twoPtrValue.ptr2;
if (TclIsVarInHash(varPtr)) {
varPtr->refCount--;
if (TclIsVarUndefined(varPtr) && (varPtr->refCount == 0)) {
CleanupVar(varPtr, NULL);
}
}
}
static void
DupNsVarName(
Tcl_Obj *srcPtr,
Tcl_Obj *dupPtr)
{
Namespace *nsPtr = srcPtr->internalRep.twoPtrValue.ptr1;
register Var *varPtr = srcPtr->internalRep.twoPtrValue.ptr2;
dupPtr->internalRep.twoPtrValue.ptr1 = nsPtr;
dupPtr->internalRep.twoPtrValue.ptr2 = varPtr;
if (TclIsVarInHash(varPtr)) {
varPtr->refCount++;
}
dupPtr->typePtr = &tclNsVarNameType;
}
#endif
/*
* parsedVarName -
*
* INTERNALREP DEFINITION:
* twoPtrValue.ptr1 = pointer to the array name Tcl_Obj (NULL if scalar)
* twoPtrValue.ptr2 = pointer to the element name string (owned by this
* Tcl_Obj), or NULL if it is a scalar variable
*/
static void
FreeParsedVarName(
Tcl_Obj *objPtr)
{
register Tcl_Obj *arrayPtr = objPtr->internalRep.twoPtrValue.ptr1;
register char *elem = objPtr->internalRep.twoPtrValue.ptr2;
if (arrayPtr != NULL) {
TclDecrRefCount(arrayPtr);
ckfree(elem);
}
}
static void
DupParsedVarName(
Tcl_Obj *srcPtr,
Tcl_Obj *dupPtr)
{
register Tcl_Obj *arrayPtr = srcPtr->internalRep.twoPtrValue.ptr1;
register char *elem = srcPtr->internalRep.twoPtrValue.ptr2;
char *elemCopy;
unsigned int elemLen;
if (arrayPtr != NULL) {
Tcl_IncrRefCount(arrayPtr);
elemLen = strlen(elem);
elemCopy = ckalloc(elemLen+1);
memcpy(elemCopy, elem, elemLen);
*(elemCopy + elemLen) = '\0';
elem = elemCopy;
}
dupPtr->internalRep.twoPtrValue.ptr1 = arrayPtr;
dupPtr->internalRep.twoPtrValue.ptr2 = elem;
dupPtr->typePtr = &tclParsedVarNameType;
}
static void
UpdateParsedVarName(
Tcl_Obj *objPtr)
{
Tcl_Obj *arrayPtr = objPtr->internalRep.twoPtrValue.ptr1;
char *part2 = objPtr->internalRep.twoPtrValue.ptr2;
char *part1, *p;
int len1, len2, totalLen;
if (arrayPtr == NULL) {
/*
* This is a parsed scalar name: what is it doing here?
*/
Tcl_Panic("scalar parsedVarName without a string rep");
}
part1 = TclGetStringFromObj(arrayPtr, &len1);
len2 = strlen(part2);
totalLen = len1 + len2 + 2;
p = ckalloc((unsigned int) totalLen + 1);
objPtr->bytes = p;
objPtr->length = totalLen;
memcpy(p, part1, (unsigned int) len1);
p += len1;
*p++ = '(';
memcpy(p, part2, (unsigned int) len2);
p += len2;
*p++ = ')';
*p = '\0';
}
/*
*----------------------------------------------------------------------
*
* Tcl_FindNamespaceVar -- MOVED OVER from tclNamesp.c
*
* Searches for a namespace variable, a variable not local to a
* procedure. The variable can be either a scalar or an array, but may
* not be an element of an array.
*
* Results:
* Returns a token for the variable if it is found. Otherwise, if it
* can't be found or there is an error, returns NULL and leaves an error
* message in the interpreter's result object if "flags" contains
* TCL_LEAVE_ERR_MSG.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Var
Tcl_FindNamespaceVar(
Tcl_Interp *interp, /* The interpreter in which to find the
* variable. */
const char *name, /* Variable's name. If it starts with "::",
* will be looked up in global namespace.
* Else, looked up first in contextNsPtr
* (current namespace if contextNsPtr is
* NULL), then in global namespace. */
Tcl_Namespace *contextNsPtr,/* Ignored if TCL_GLOBAL_ONLY flag set.
* Otherwise, points to namespace in which to
* resolve name. If NULL, look up name in the
* current namespace. */
int flags) /* An OR'd combination of: AVOID_RESOLVERS,
* TCL_GLOBAL_ONLY (look up name only in
* global namespace), TCL_NAMESPACE_ONLY (look
* up only in contextNsPtr, or the current
* namespace if contextNsPtr is NULL), and
* TCL_LEAVE_ERR_MSG. If both TCL_GLOBAL_ONLY
* and TCL_NAMESPACE_ONLY are given,
* TCL_GLOBAL_ONLY is ignored. */
{
Tcl_Obj *namePtr = Tcl_NewStringObj(name, -1);
Tcl_Var var;
Tcl_IncrRefCount(namePtr);
var = ObjFindNamespaceVar(interp, namePtr, contextNsPtr, flags);
Tcl_DecrRefCount(namePtr);
return var;
}
static Tcl_Var
ObjFindNamespaceVar(
Tcl_Interp *interp, /* The interpreter in which to find the
* variable. */
Tcl_Obj *namePtr, /* Variable's name. If it starts with "::",
* will be looked up in global namespace.
* Else, looked up first in contextNsPtr
* (current namespace if contextNsPtr is
* NULL), then in global namespace. */
Tcl_Namespace *contextNsPtr,/* Ignored if TCL_GLOBAL_ONLY flag set.
* Otherwise, points to namespace in which to
* resolve name. If NULL, look up name in the
* current namespace. */
int flags) /* An OR'd combination of: AVOID_RESOLVERS,
* TCL_GLOBAL_ONLY (look up name only in
* global namespace), TCL_NAMESPACE_ONLY (look
* up only in contextNsPtr, or the current
* namespace if contextNsPtr is NULL), and
* TCL_LEAVE_ERR_MSG. If both TCL_GLOBAL_ONLY
* and TCL_NAMESPACE_ONLY are given,
* TCL_GLOBAL_ONLY is ignored. */
{
Interp *iPtr = (Interp *) interp;
ResolverScheme *resPtr;
Namespace *nsPtr[2], *cxtNsPtr;
const char *simpleName;
Var *varPtr;
register int search;
int result;
Tcl_Var var;
Tcl_Obj *simpleNamePtr;
char *name = TclGetString(namePtr);
/*
* If this namespace has a variable resolver, then give it first crack at
* the variable resolution. It may return a Tcl_Var value, it may signal
* to continue onward, or it may signal an error.
*/
if ((flags & TCL_GLOBAL_ONLY) != 0) {
cxtNsPtr = (Namespace *) TclGetGlobalNamespace(interp);
} else if (contextNsPtr != NULL) {
cxtNsPtr = (Namespace *) contextNsPtr;
} else {
cxtNsPtr = (Namespace *) TclGetCurrentNamespace(interp);
}
if (!(flags & AVOID_RESOLVERS) &&
(cxtNsPtr->varResProc != NULL || iPtr->resolverPtr != NULL)) {
resPtr = iPtr->resolverPtr;
if (cxtNsPtr->varResProc) {
result = (*cxtNsPtr->varResProc)(interp, name,
(Tcl_Namespace *) cxtNsPtr, flags, &var);
} else {
result = TCL_CONTINUE;
}
while (result == TCL_CONTINUE && resPtr) {
if (resPtr->varResProc) {
result = (*resPtr->varResProc)(interp, name,
(Tcl_Namespace *) cxtNsPtr, flags, &var);
}
resPtr = resPtr->nextPtr;
}
if (result == TCL_OK) {
return var;
} else if (result != TCL_CONTINUE) {
return (Tcl_Var) NULL;
}
}
/*
* Find the namespace(s) that contain the variable.
*/
TclGetNamespaceForQualName(interp, name, (Namespace *) contextNsPtr,
flags, &nsPtr[0], &nsPtr[1], &cxtNsPtr, &simpleName);
/*
* Look for the variable in the variable table of its namespace. Be sure
* to check both possible search paths: from the specified namespace
* context and from the global namespace.
*/
varPtr = NULL;
if (simpleName != name) {
simpleNamePtr = Tcl_NewStringObj(simpleName, -1);
Tcl_IncrRefCount(simpleNamePtr);
} else {
simpleNamePtr = namePtr;
}
for (search = 0; (search < 2) && (varPtr == NULL); search++) {
if ((nsPtr[search] != NULL) && (simpleName != NULL)) {
varPtr = VarHashFindVar(&nsPtr[search]->varTable, simpleNamePtr);
}
}
if (simpleName != name) {
Tcl_DecrRefCount(simpleNamePtr);
}
if ((varPtr == NULL) && (flags & TCL_LEAVE_ERR_MSG)) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "unknown variable \"", name, "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARIABLE", name, NULL);
}
return (Tcl_Var) varPtr;
}
/*
*----------------------------------------------------------------------
*
* InfoVarsCmd -- (moved over from tclCmdIL.c)
*
* Called to implement the "info vars" command that returns the list of
* variables in the interpreter that match an optional pattern. The
* pattern, if any, consists of an optional sequence of namespace names
* separated by "::" qualifiers, which is followed by a glob-style
* pattern that restricts which variables are returned. Handles the
* following syntax:
*
* info vars ?pattern?
*
* Results:
* Returns TCL_OK if successful and TCL_ERROR if there is an error.
*
* Side effects:
* Returns a result in the interpreter's result object. If there is an
* error, the result is an error message.
*
*----------------------------------------------------------------------
*/
int
TclInfoVarsCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Interp *iPtr = (Interp *) interp;
char *varName, *pattern;
const char *simplePattern;
Tcl_HashSearch search;
Var *varPtr;
Namespace *nsPtr;
Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp);
Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp);
Tcl_Obj *listPtr, *elemObjPtr;
int specificNsInPattern = 0;/* Init. to avoid compiler warning. */
Tcl_Obj *simplePatternPtr = NULL, *varNamePtr;
/*
* Get the pattern and find the "effective namespace" in which to list
* variables. We only use this effective namespace if there's no active
* Tcl procedure frame.
*/
if (objc == 1) {
simplePattern = NULL;
nsPtr = currNsPtr;
specificNsInPattern = 0;
} else if (objc == 2) {
/*
* From the pattern, get the effective namespace and the simple
* pattern (no namespace qualifiers or ::'s) at the end. If an error
* was found while parsing the pattern, return it. Otherwise, if the
* namespace wasn't found, just leave nsPtr NULL: we will return an
* empty list since no variables there can be found.
*/
Namespace *dummy1NsPtr, *dummy2NsPtr;
pattern = TclGetString(objv[1]);
TclGetNamespaceForQualName(interp, pattern, (Namespace *) NULL,
/*flags*/ 0, &nsPtr, &dummy1NsPtr, &dummy2NsPtr,
&simplePattern);
if (nsPtr != NULL) { /* We successfully found the pattern's ns. */
specificNsInPattern = (strcmp(simplePattern, pattern) != 0);
if (simplePattern == pattern) {
simplePatternPtr = objv[1];
} else {
simplePatternPtr = Tcl_NewStringObj(simplePattern, -1);
}
Tcl_IncrRefCount(simplePatternPtr);
}
} else {
Tcl_WrongNumArgs(interp, 1, objv, "?pattern?");
return TCL_ERROR;
}
/*
* If the namespace specified in the pattern wasn't found, just return.
*/
if (nsPtr == NULL) {
return TCL_OK;
}
listPtr = Tcl_NewListObj(0, NULL);
if (!(iPtr->varFramePtr->isProcCallFrame & FRAME_IS_PROC)
|| specificNsInPattern) {
/*
* There is no frame pointer, the frame pointer was pushed only to
* activate a namespace, or we are in a procedure call frame but a
* specific namespace was specified. Create a list containing only the
* variables in the effective namespace's variable table.
*/
if (simplePattern && TclMatchIsTrivial(simplePattern)) {
/*
* If we can just do hash lookups, that simplifies things a lot.
*/
varPtr = VarHashFindVar(&nsPtr->varTable, simplePatternPtr);
if (varPtr) {
if (!TclIsVarUndefined(varPtr)
|| TclIsVarNamespaceVar(varPtr)) {
if (specificNsInPattern) {
elemObjPtr = Tcl_NewObj();
Tcl_GetVariableFullName(interp, (Tcl_Var) varPtr,
elemObjPtr);
} else {
elemObjPtr = VarHashGetKey(varPtr);
}
Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
}
} else if ((nsPtr != globalNsPtr) && !specificNsInPattern) {
varPtr = VarHashFindVar(&globalNsPtr->varTable,
simplePatternPtr);
if (varPtr) {
if (!TclIsVarUndefined(varPtr)
|| TclIsVarNamespaceVar(varPtr)) {
Tcl_ListObjAppendElement(interp, listPtr,
VarHashGetKey(varPtr));
}
}
}
} else {
/*
* Have to scan the tables of variables.
*/
varPtr = VarHashFirstVar(&nsPtr->varTable, &search);
while (varPtr) {
if (!TclIsVarUndefined(varPtr)
|| TclIsVarNamespaceVar(varPtr)) {
varNamePtr = VarHashGetKey(varPtr);
varName = TclGetString(varNamePtr);
if ((simplePattern == NULL)
|| Tcl_StringMatch(varName, simplePattern)) {
if (specificNsInPattern) {
elemObjPtr = Tcl_NewObj();
Tcl_GetVariableFullName(interp, (Tcl_Var) varPtr,
elemObjPtr);
} else {
elemObjPtr = varNamePtr;
}
Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
}
}
varPtr = VarHashNextVar(&search);
}
/*
* If the effective namespace isn't the global :: namespace, and a
* specific namespace wasn't requested in the pattern (i.e., the
* pattern only specifies variable names), then add in all global
* :: variables that match the simple pattern. Of course, add in
* only those variables that aren't hidden by a variable in the
* effective namespace.
*/
if ((nsPtr != globalNsPtr) && !specificNsInPattern) {
varPtr = VarHashFirstVar(&globalNsPtr->varTable,&search);
while (varPtr) {
if (!TclIsVarUndefined(varPtr)
|| TclIsVarNamespaceVar(varPtr)) {
varNamePtr = VarHashGetKey(varPtr);
varName = TclGetString(varNamePtr);
if ((simplePattern == NULL)
|| Tcl_StringMatch(varName, simplePattern)) {
if (VarHashFindVar(&nsPtr->varTable,
varNamePtr) == NULL) {
Tcl_ListObjAppendElement(interp, listPtr,
varNamePtr);
}
}
}
varPtr = VarHashNextVar(&search);
}
}
}
} else if (((Interp *)interp)->varFramePtr->procPtr != NULL) {
AppendLocals(interp, listPtr, simplePatternPtr, 1);
}
if (simplePatternPtr) {
Tcl_DecrRefCount(simplePatternPtr);
}
Tcl_SetObjResult(interp, listPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* InfoGlobalsCmd -- (moved over from tclCmdIL.c)
*
* Called to implement the "info globals" command that returns the list
* of global variables matching an optional pattern. Handles the
* following syntax:
*
* info globals ?pattern?
*
* Results:
* Returns TCL_OK if successful and TCL_ERROR if there is an error.
*
* Side effects:
* Returns a result in the interpreter's result object. If there is an
* error, the result is an error message.
*
*----------------------------------------------------------------------
*/
int
TclInfoGlobalsCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
char *varName, *pattern;
Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp);
Tcl_HashSearch search;
Var *varPtr;
Tcl_Obj *listPtr, *varNamePtr, *patternPtr;
if (objc == 1) {
pattern = NULL;
} else if (objc == 2) {
pattern = TclGetString(objv[1]);
/*
* Strip leading global-namespace qualifiers. [Bug 1057461]
*/
if (pattern[0] == ':' && pattern[1] == ':') {
while (*pattern == ':') {
pattern++;
}
}
} else {
Tcl_WrongNumArgs(interp, 1, objv, "?pattern?");
return TCL_ERROR;
}
/*
* Scan through the global :: namespace's variable table and create a list
* of all global variables that match the pattern.
*/
listPtr = Tcl_NewListObj(0, NULL);
if (pattern != NULL && TclMatchIsTrivial(pattern)) {
if (pattern == TclGetString(objv[1])) {
patternPtr = objv[1];
} else {
patternPtr = Tcl_NewStringObj(pattern, -1);
}
Tcl_IncrRefCount(patternPtr);
varPtr = VarHashFindVar(&globalNsPtr->varTable, patternPtr);
if (varPtr) {
if (!TclIsVarUndefined(varPtr)) {
Tcl_ListObjAppendElement(interp, listPtr,
VarHashGetKey(varPtr));
}
}
Tcl_DecrRefCount(patternPtr);
} else {
for (varPtr = VarHashFirstVar(&globalNsPtr->varTable, &search);
varPtr != NULL;
varPtr = VarHashNextVar(&search)) {
if (TclIsVarUndefined(varPtr)) {
continue;
}
varNamePtr = VarHashGetKey(varPtr);
varName = TclGetString(varNamePtr);
if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) {
Tcl_ListObjAppendElement(interp, listPtr, varNamePtr);
}
}
}
Tcl_SetObjResult(interp, listPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclInfoLocalsCmd -- (moved over from tclCmdIl.c)
*
* Called to implement the "info locals" command to return a list of
* local variables that match an optional pattern. Handles the following
* syntax:
*
* info locals ?pattern?
*
* Results:
* Returns TCL_OK if successful and TCL_ERROR if there is an error.
*
* Side effects:
* Returns a result in the interpreter's result object. If there is an
* error, the result is an error message.
*
*----------------------------------------------------------------------
*/
int
TclInfoLocalsCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Interp *iPtr = (Interp *) interp;
Tcl_Obj *patternPtr;
Tcl_Obj *listPtr;
if (objc == 1) {
patternPtr = NULL;
} else if (objc == 2) {
patternPtr = objv[1];
} else {
Tcl_WrongNumArgs(interp, 1, objv, "?pattern?");
return TCL_ERROR;
}
if (!(iPtr->varFramePtr->isProcCallFrame & FRAME_IS_PROC )) {
return TCL_OK;
}
/*
* Return a list containing names of first the compiled locals (i.e. the
* ones stored in the call frame), then the variables in the local hash
* table (if one exists).
*/
listPtr = Tcl_NewListObj(0, NULL);
AppendLocals(interp, listPtr, patternPtr, 0);
Tcl_SetObjResult(interp, listPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* AppendLocals --
*
* Append the local variables for the current frame to the specified list
* object.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
AppendLocals(
Tcl_Interp *interp, /* Current interpreter. */
Tcl_Obj *listPtr, /* List object to append names to. */
Tcl_Obj *patternPtr, /* Pattern to match against. */
int includeLinks) /* 1 if upvars should be included, else 0. */
{
Interp *iPtr = (Interp *) interp;
Var *varPtr;
int i, localVarCt;
Tcl_Obj **varNamePtr;
char *varName;
TclVarHashTable *localVarTablePtr;
Tcl_HashSearch search;
const char *pattern = patternPtr? TclGetString(patternPtr) : NULL;
Tcl_Obj *objNamePtr;
localVarCt = iPtr->varFramePtr->numCompiledLocals;
varPtr = iPtr->varFramePtr->compiledLocals;
localVarTablePtr = iPtr->varFramePtr->varTablePtr;
varNamePtr = &iPtr->varFramePtr->localCachePtr->varName0;
for (i = 0; i < localVarCt; i++, varNamePtr++) {
/*
* Skip nameless (temporary) variables and undefined variables.
*/
if (*varNamePtr && !TclIsVarUndefined(varPtr)
&& (includeLinks || !TclIsVarLink(varPtr))) {
varName = TclGetString(*varNamePtr);
if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) {
Tcl_ListObjAppendElement(interp, listPtr, *varNamePtr);
}
}
varPtr++;
}
/*
* Do nothing if no local variables.
*/
if (localVarTablePtr == NULL) {
return;
}
/*
* Check for the simple and fast case.
*/
if ((pattern != NULL) && TclMatchIsTrivial(pattern)) {
varPtr = VarHashFindVar(localVarTablePtr, patternPtr);
if (varPtr != NULL) {
if (!TclIsVarUndefined(varPtr)
&& (includeLinks || !TclIsVarLink(varPtr))) {
Tcl_ListObjAppendElement(interp, listPtr,
VarHashGetKey(varPtr));
}
}
return;
}
/*
* Scan over and process all local variables.
*/
for (varPtr = VarHashFirstVar(localVarTablePtr, &search);
varPtr != NULL;
varPtr = VarHashNextVar(&search)) {
if (!TclIsVarUndefined(varPtr)
&& (includeLinks || !TclIsVarLink(varPtr))) {
objNamePtr = VarHashGetKey(varPtr);
varName = TclGetString(objNamePtr);
if ((pattern == NULL) || Tcl_StringMatch(varName, pattern)) {
Tcl_ListObjAppendElement(interp, listPtr, objNamePtr);
}
}
}
}
/*
* Hash table implementation - first, just copy and adapt the obj key stuff
*/
void
TclInitVarHashTable(
TclVarHashTable *tablePtr,
Namespace *nsPtr)
{
Tcl_InitCustomHashTable(&tablePtr->table,
TCL_CUSTOM_TYPE_KEYS, &tclVarHashKeyType);
tablePtr->nsPtr = nsPtr;
}
static Tcl_HashEntry *
AllocVarEntry(
Tcl_HashTable *tablePtr, /* Hash table. */
void *keyPtr) /* Key to store in the hash table entry. */
{
Tcl_Obj *objPtr = (Tcl_Obj *) keyPtr;
Tcl_HashEntry *hPtr;
Var *varPtr;
varPtr = (Var *) ckalloc(sizeof(VarInHash));
varPtr->flags = VAR_IN_HASHTABLE;
varPtr->value.objPtr = NULL;
VarHashRefCount(varPtr) = 1;
hPtr = &(((VarInHash *)varPtr)->entry);
Tcl_SetHashValue(hPtr, varPtr);
hPtr->key.objPtr = objPtr;
Tcl_IncrRefCount(objPtr);
return hPtr;
}
static void
FreeVarEntry(
Tcl_HashEntry *hPtr)
{
Var *varPtr = VarHashGetValue(hPtr);
Tcl_Obj *objPtr = hPtr->key.objPtr;
if (TclIsVarUndefined(varPtr) && !TclIsVarTraced(varPtr)
&& (VarHashRefCount(varPtr) == 1)) {
ckfree((char *) varPtr);
} else {
VarHashInvalidateEntry(varPtr);
TclSetVarUndefined(varPtr);
VarHashRefCount(varPtr)--;
}
Tcl_DecrRefCount(objPtr);
}
static int
CompareVarKeys(
void *keyPtr, /* New key to compare. */
Tcl_HashEntry *hPtr) /* Existing key to compare. */
{
Tcl_Obj *objPtr1 = (Tcl_Obj *) keyPtr;
Tcl_Obj *objPtr2 = hPtr->key.objPtr;
register const char *p1, *p2;
register int l1, l2;
/*
* If the object pointers are the same then they match.
*/
if (objPtr1 == objPtr2) {
return 1;
}
/*
* Don't use Tcl_GetStringFromObj as it would prevent l1 and l2 being in a
* register.
*/
p1 = TclGetString(objPtr1);
l1 = objPtr1->length;
p2 = TclGetString(objPtr2);
l2 = objPtr2->length;
/*
* Only compare if the string representations are of the same length.
*/
if (l1 == l2) {
for (;; p1++, p2++, l1--) {
if (*p1 != *p2) {
break;
}
if (l1 == 0) {
return 1;
}
}
}
return 0;
}
static unsigned int
HashVarKey(
Tcl_HashTable *tablePtr, /* Hash table. */
void *keyPtr) /* Key from which to compute hash value. */
{
Tcl_Obj *objPtr = (Tcl_Obj *) keyPtr;
const char *string = TclGetString(objPtr);
int length = objPtr->length;
unsigned int result = 0;
int i;
/*
* I tried a zillion different hash functions and asked many other people
* for advice. Many people had their own favorite functions, all
* different, but no-one had much idea why they were good ones. I chose
* the one below (multiply by 9 and add new character) because of the
* following reasons:
*
* 1. Multiplying by 10 is perfect for keys that are decimal strings, and
* multiplying by 9 is just about as good.
* 2. Times-9 is (shift-left-3) plus (old). This means that each
* character's bits hang around in the low-order bits of the hash value
* for ever, plus they spread fairly rapidly up to the high-order bits
* to fill out the hash value. This seems works well both for decimal
* and non-decimal strings.
*/
for (i=0 ; i<length ; i++) {
result += (result << 3) + string[i];
}
return result;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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