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-rw-r--r--generic/tclVar.c1772
1 files changed, 1281 insertions, 491 deletions
diff --git a/generic/tclVar.c b/generic/tclVar.c
index 4a60c5e..14b33f9 100644
--- a/generic/tclVar.c
+++ b/generic/tclVar.c
@@ -15,7 +15,7 @@
* 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 1.53 2002/06/17 22:52:51 hobbs Exp $
+ * RCS: @(#) $Id: tclVar.c,v 1.54 2002/07/15 22:18:07 msofer Exp $
*/
#include "tclInt.h"
@@ -26,15 +26,15 @@
* variable access is denied.
*/
-static char *noSuchVar = "no such variable";
-static char *isArray = "variable is array";
-static char *needArray = "variable isn't array";
-static char *noSuchElement = "no such element in array";
-static char *danglingElement = "upvar refers to element in deleted array";
-static char *danglingVar = "upvar refers to variable in deleted namespace";
-static char *badNamespace = "parent namespace doesn't exist";
-static char *missingName = "missing variable name";
-static char *isArrayElement = "name refers to an element in an array";
+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";
/*
* Forward references to procedures defined later in this file:
@@ -42,7 +42,7 @@ static char *isArrayElement = "name refers to an element in an array";
static int CallVarTraces _ANSI_ARGS_((Interp *iPtr, Var *arrayPtr,
Var *varPtr, char *part1, CONST char *part2,
- int flags, int leaveErrMsg));
+ int flags, CONST int leaveErrMsg));
static void CleanupVar _ANSI_ARGS_((Var *varPtr,
Var *arrayPtr));
static void DeleteSearches _ANSI_ARGS_((Var *arrayVarPtr));
@@ -50,19 +50,90 @@ static void DeleteArray _ANSI_ARGS_((Interp *iPtr,
char *arrayName, Var *varPtr, int flags));
static void DisposeTraceResult _ANSI_ARGS_((int flags,
char *result));
-static int MakeUpvar _ANSI_ARGS_((
- Interp *iPtr, CallFrame *framePtr,
- char *otherP1, CONST char *otherP2, int otherFlags,
- CONST char *myName, int myFlags));
+static int ObjMakeUpvar _ANSI_ARGS_((Tcl_Interp *interp,
+ CallFrame *framePtr, Tcl_Obj *otherP1Ptr,
+ CONST char *otherP2, CONST int otherFlags,
+ CONST char *myName, CONST int myFlags, int index));
static Var * NewVar _ANSI_ARGS_((void));
static ArraySearch * ParseSearchId _ANSI_ARGS_((Tcl_Interp *interp,
- Var *varPtr, char *varName, Tcl_Obj *handleObj));
+ CONST Var *varPtr, CONST char *varName, Tcl_Obj *handleObj));
static void VarErrMsg _ANSI_ARGS_((Tcl_Interp *interp,
- char *part1, CONST char *part2, char *operation,
- char *reason));
+ CONST char *part1, CONST char *part2, CONST char *operation,
+ CONST char *reason));
static int SetArraySearchObj _ANSI_ARGS_((Tcl_Interp *interp,
Tcl_Obj *objPtr));
+
+/*
+ * Functions defined in this file and currently only used here and by the
+ * bytecode compiler and engine. Some of these could later be placed
+ * in the public interface.
+ */
+
+Var * TclLookupArrayElement _ANSI_ARGS_((Tcl_Interp *interp,
+ CONST char *arrayName, CONST char *elName, CONST int flags, CONST char *msg,
+ CONST int createPart1, CONST int createPart2, Var *arrayPtr));
+Var * TclLookupSimpleVar _ANSI_ARGS_((Tcl_Interp *interp, CONST char *varName,
+ int flags, CONST int create, CONST char **errMsgPtr, int *indexPtr));
+Var * TclObjLookupVar _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Obj *part1Ptr,
+ CONST char *part2, int flags, CONST char *msg, CONST int createPart1,
+ CONST int createPart2, Var **arrayPtrPtr));
+int TclObjUnsetVar2 _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Obj *part1Ptr,
+ CONST char *part2, int flags));
+Tcl_Obj * TclPtrGetVar _ANSI_ARGS_((Tcl_Interp *interp, Var *varPtr,
+ Var *arrayPtr, char *part1, CONST char *part2, CONST int flags));
+Tcl_Obj * TclPtrSetVar _ANSI_ARGS_((Tcl_Interp *interp, Var *varPtr,
+ Var *arrayPtr, char *part1, CONST char *part2,
+ Tcl_Obj *newValuePtr, CONST int flags));
+Tcl_Obj * TclPtrIncrVar _ANSI_ARGS_((Tcl_Interp *interp, Var *varPtr,
+ Var *arrayPtr, char *part1, CONST char *part2,
+ CONST long i, CONST int flags));
+
+static Tcl_FreeInternalRepProc FreeLocalVarName;
+static Tcl_DupInternalRepProc DupLocalVarName;
+static Tcl_UpdateStringProc UpdateLocalVarName;
+static Tcl_FreeInternalRepProc FreeNsVarName;
+static Tcl_DupInternalRepProc DupNsVarName;
+static Tcl_FreeInternalRepProc FreeParsedVarName;
+static Tcl_DupInternalRepProc DupParsedVarName;
+static Tcl_UpdateStringProc UpdateParsedVarName;
+
+/*
+ * Types of Tcl_Objs used to cache variable lookups.
+ *
+ *
+ * localVarName - INTERNALREP DEFINITION:
+ * twoPtrValue.ptr1 = pointer to the corresponding Proc
+ * twoPtrValue.ptr2 = 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
+ */
+
+Tcl_ObjType tclLocalVarNameType = {
+ "localVarName",
+ FreeLocalVarName, DupLocalVarName, UpdateLocalVarName, NULL
+};
+
+Tcl_ObjType tclNsVarNameType = {
+ "namespaceVarName",
+ FreeNsVarName, DupNsVarName, NULL, NULL
+};
+
+Tcl_ObjType tclParsedVarNameType = {
+ "parsedVarName",
+ FreeParsedVarName, DupParsedVarName, UpdateParsedVarName, NULL
+};
+
/*
* Type of Tcl_Objs used to speed up array searches.
*
@@ -85,8 +156,11 @@ Tcl_ObjType tclArraySearchType = {
*
* TclLookupVar --
*
- * This procedure is used by virtually all of the variable code to
- * locate a variable given its name(s).
+ * This procedure is used to locate a variable given its name(s). It
+ * has been mostly superseded by TclObjLookupVar, it is now only used
+ * by the string-based interfaces. It is kept in tcl8.4 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
@@ -115,7 +189,6 @@ Tcl_ObjType tclArraySearchType = {
*
*----------------------------------------------------------------------
*/
-
Var *
TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
arrayPtrPtr)
@@ -127,7 +200,7 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
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. */
- char *msg; /* Verb to use in error messages, e.g.
+ 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
@@ -141,17 +214,7 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
* address of array variable. Otherwise
* this is set to NULL. */
{
- 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. */
- Tcl_HashTable *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. */
+ Var *varPtr;
CONST char *elName; /* Name of array element or NULL; may be
* same as part2, or may be openParen+1. */
char *openParen, *closeParen;
@@ -160,16 +223,13 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
* parens around the index. Otherwise they
* are NULL. These are needed to restore
* the parens after parsing the name. */
- Namespace *varNsPtr, *cxtNsPtr, *dummy1Ptr, *dummy2Ptr;
- ResolverScheme *resPtr;
- Tcl_HashEntry *hPtr;
register char *p;
- int new, i, result;
+ CONST char *errMsg = NULL;
+ int index;
varPtr = NULL;
*arrayPtrPtr = NULL;
openParen = closeParen = NULL;
- varNsPtr = NULL; /* set non-NULL if a nonlocal variable */
/*
* Parse part1 into array name and index.
@@ -208,13 +268,410 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
}
}
+ varPtr = TclLookupSimpleVar(interp, part1, flags,
+ createPart1, &errMsg, &index);
+ if (varPtr == NULL) {
+ if ((errMsg != NULL) && (flags & TCL_LEAVE_ERR_MSG)) {
+ VarErrMsg(interp, part1, elName, msg, errMsg);
+ }
+ return NULL;
+ }
+
+ while (TclIsVarLink(varPtr)) {
+ varPtr = varPtr->value.linkPtr;
+ }
+ if (elName == NULL) {
+ return varPtr;
+ }
+ *arrayPtrPtr = varPtr;
+ varPtr = TclLookupArrayElement(interp, part1, elName, flags,
+ msg, createPart1, createPart2, varPtr);
+
+ done:
+ if (openParen != NULL) {
+ *openParen = '(';
+ *closeParen = ')';
+ }
+ return varPtr;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclObjLookupVar --
+ *
+ * This procedure 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 tclLocalVarNameType,
+ * tclNsVarNameType or tclParsedVarNameType and caches as much of the
+ * lookup as it can.
+ *
+ *----------------------------------------------------------------------
+ */
+Var *
+TclObjLookupVar(interp, part1Ptr, part2, flags, msg, createPart1, createPart2,
+ arrayPtrPtr)
+ 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. */
+{
+ 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;
+ Tcl_ObjType *typePtr = part1Ptr->typePtr;
+ CONST char *errMsg = NULL;
+ CallFrame *varFramePtr = iPtr->varFramePtr;
+ Namespace *nsPtr;
+
+ /*
+ * If part1Ptr is a tclParsedVarNameType, separate it into the
+ * pre-parsed parts.
+ */
+
+ *arrayPtrPtr = NULL;
+ if (typePtr == &tclParsedVarNameType) {
+ if (part1Ptr->internalRep.twoPtrValue.ptr1 != NULL) {
+ if (part2 != NULL) {
+ /*
+ * ERROR: part1Ptr is already an array element, cannot
+ * specify a part2.
+ */
+
+ if (flags & TCL_LEAVE_ERR_MSG) {
+ part1 = TclGetString(part1Ptr);
+ VarErrMsg(interp, part1, part2, msg, needArray);
+ }
+ return NULL;
+ }
+ part2 = (char *) part1Ptr->internalRep.twoPtrValue.ptr2;
+ part1Ptr = (Tcl_Obj *) part1Ptr->internalRep.twoPtrValue.ptr1;
+ typePtr = part1Ptr->typePtr;
+ }
+ parsed = 1;
+ }
+ part1 = Tcl_GetStringFromObj(part1Ptr, &len1);
+
+ nsPtr = ((varFramePtr == NULL)? iPtr->globalNsPtr : varFramePtr->nsPtr);
+ if (nsPtr->varResProc != NULL || iPtr->resolverPtr != NULL) {
+ goto doParse;
+ }
+
+ if (typePtr == &tclLocalVarNameType) {
+ Proc *procPtr = (Proc *) part1Ptr->internalRep.twoPtrValue.ptr1;
+ int localIndex = (int) part1Ptr->internalRep.twoPtrValue.ptr2;
+ int useLocal;
+
+ useLocal = ((varFramePtr != NULL) && varFramePtr->isProcCallFrame
+ && !(flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)));
+ if (useLocal && (procPtr == varFramePtr->procPtr)) {
+ /*
+ * part1Ptr points to an indexed local variable of the
+ * correct procedure: use the cached value.
+ */
+
+ varPtr = &(varFramePtr->compiledLocals[localIndex]);
+ goto donePart1;
+ }
+ goto doneParsing;
+ } else if (typePtr == &tclNsVarNameType) {
+ Namespace *cachedNsPtr;
+ int useGlobal, useReference;
+
+ varPtr = (Var *) part1Ptr->internalRep.twoPtrValue.ptr2;
+ cachedNsPtr = (Namespace *) part1Ptr->internalRep.twoPtrValue.ptr1;
+ useGlobal = (cachedNsPtr == iPtr->globalNsPtr)
+ && ((flags & TCL_GLOBAL_ONLY)
+ || ((*part1 == ':') && (*(part1+1) == ':'))
+ || (varFramePtr == NULL)
+ || (!varFramePtr->isProcCallFrame
+ && (nsPtr == iPtr->globalNsPtr)));
+ useReference = useGlobal || ((cachedNsPtr == nsPtr)
+ && ((flags & TCL_NAMESPACE_ONLY)
+ || (varFramePtr && !varFramePtr->isProcCallFrame
+ && !(flags & TCL_GLOBAL_ONLY)
+ /* careful: an undefined ns variable could
+ * be hiding a valid global reference. */
+ && !(varPtr->flags & VAR_UNDEFINED))));
+ if (useReference && (varPtr->hPtr != NULL)) {
+ /*
+ * 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 (varPtr->hPtr == NULL), 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;
+ }
+
+ doParse:
+ if (!parsed && (*(part1 + len1 - 1) == ')')) {
+ /*
+ * part1Ptr is possibly an unparsed array element.
+ */
+ register int i;
+ char *newPart2;
+ len2 = -1;
+ for (i = 0; i < len1; i++) {
+ if (*(part1 + i) == '(') {
+ if (part2 != NULL) {
+ if (flags & TCL_LEAVE_ERR_MSG) {
+ VarErrMsg(interp, part1, part2, msg, needArray);
+ }
+ }
+
+ /*
+ * part1Ptr points to an array element: convert it to
+ * tclParsedVarNameType.
+ */
+
+ 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;
+
+ objPtr = part1Ptr;
+ objPtr->typePtr = &tclParsedVarNameType;
+
+ part1Ptr = Tcl_NewStringObj(part1, len1);
+ Tcl_IncrRefCount(part1Ptr);
+ typePtr = part1Ptr->typePtr;
+ if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
+ typePtr->freeIntRepProc(objPtr);
+ }
+
+ objPtr->internalRep.twoPtrValue.ptr1 = (VOID *) part1Ptr;
+ objPtr->internalRep.twoPtrValue.ptr2 = (VOID *) part2;
+ 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.
+ */
+
+ if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
+ typePtr->freeIntRepProc(part1Ptr);
+ part1Ptr->typePtr = NULL;
+ }
+
+ varPtr = TclLookupSimpleVar(interp, part1, flags,
+ createPart1, &errMsg, &index);
+ if (varPtr == NULL) {
+ if ((errMsg != NULL) && (flags & TCL_LEAVE_ERR_MSG)) {
+ VarErrMsg(interp, part1, part2, msg, errMsg);
+ }
+ return NULL;
+ }
+
+ /*
+ * Cache the newly found variable if possible.
+ */
+
+ if (index >= 0) {
+ /*
+ * An indexed local variable.
+ */
+
+ Proc *procPtr = ((Interp *) interp)->varFramePtr->procPtr;
+
+ part1Ptr->typePtr = &tclLocalVarNameType;
+ procPtr->refCount++;
+ part1Ptr->internalRep.twoPtrValue.ptr1 = (VOID *) procPtr;
+ part1Ptr->internalRep.twoPtrValue.ptr2 = (VOID *) index;
+ } else if (index > -3) {
+ Namespace *nsPtr;
+
+ nsPtr = ((index == -1)? iPtr->globalNsPtr : varFramePtr->nsPtr);
+ varPtr->refCount++;
+ part1Ptr->typePtr = &tclNsVarNameType;
+ part1Ptr->internalRep.twoPtrValue.ptr1 = (VOID *) nsPtr;
+ part1Ptr->internalRep.twoPtrValue.ptr2 = (VOID *) varPtr;
+ } 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);
+ VarErrMsg(interp, part1, part2, msg, "Cached variable reference is NULL.");
+ }
+ return NULL;
+ }
+#endif
+ while (TclIsVarLink(varPtr)) {
+ varPtr = varPtr->value.linkPtr;
+ }
+ if (part2 == NULL) {
+ /*
+ * Scalar variable or array found, return.
+ */
+
+ return varPtr;
+ } else {
+ /*
+ * Array element sought: look it up.
+ */
+
+ part1 = TclGetString(part1Ptr);
+ *arrayPtrPtr = varPtr;
+
+ return TclLookupArrayElement(interp, part1, part2, flags,
+ msg, createPart1, createPart2, varPtr);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclLookupSimpleVar --
+ *
+ * This procedure 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(interp, varName, flags, create, errMsgPtr, indexPtr)
+ Tcl_Interp *interp; /* Interpreter to use for lookup. */
+ CONST char *varName; /* This is a simple variable name that could
+ * representa scalar or an array. */
+ int flags; /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
+ * 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. */
+ Tcl_HashTable *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;
+ Tcl_HashEntry *hPtr;
+ int new, i, result;
+
+ varPtr = NULL;
+ varNsPtr = NULL; /* set non-NULL if a nonlocal variable */
+ *indexPtr = -3;
+
/*
* 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 || iPtr->varFramePtr == NULL) {
+ if ((flags & TCL_GLOBAL_ONLY) || iPtr->varFramePtr == NULL) {
cxtNsPtr = iPtr->globalNsPtr;
} else {
cxtNsPtr = iPtr->varFramePtr->nsPtr;
@@ -224,7 +681,7 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
resPtr = iPtr->resolverPtr;
if (cxtNsPtr->varResProc) {
- result = (*cxtNsPtr->varResProc)(interp, part1,
+ result = (*cxtNsPtr->varResProc)(interp, varName,
(Tcl_Namespace *) cxtNsPtr, flags, &var);
} else {
result = TCL_CONTINUE;
@@ -232,7 +689,7 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
while (result == TCL_CONTINUE && resPtr) {
if (resPtr->varResProc) {
- result = (*resPtr->varResProc)(interp, part1,
+ result = (*resPtr->varResProc)(interp, varName,
(Tcl_Namespace *) cxtNsPtr, flags, &var);
}
resPtr = resPtr->nextPtr;
@@ -240,74 +697,85 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
if (result == TCL_OK) {
varPtr = (Var *) var;
- goto lookupVarPart2;
+ return varPtr;
} else if (result != TCL_CONTINUE) {
- varPtr = (Var *) NULL;
- /* can't just return here as input string is in an
- * inconsistent state... */
- goto done;
+ return NULL;
}
}
/*
- * Look up part1. Look it up as either a namespace variable or as a
+ * Look up varName. Look it up as either a namespace variable or as a
* local variable in a procedure call frame (varFramePtr).
- * Interpret part1 as a namespace variable if:
+ * 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 part1 is a local variable, search first in the
+ * 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 createPart1 and the variable isn't found, create the variable and,
+ * 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)
|| (varFramePtr == NULL)
|| !varFramePtr->isProcCallFrame
- || (strstr(part1, "::") != NULL)) {
+ || (strstr(varName, "::") != NULL)) {
CONST char *tail;
+ int lookGlobal;
+ 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 & TCL_NAMESPACE_ONLY) {
+ *indexPtr = -2;
+ }
+
/*
* Don't pass TCL_LEAVE_ERR_MSG, we may yet create the variable,
* or otherwise generate our own error!
*/
- var = Tcl_FindNamespaceVar(interp, part1, (Tcl_Namespace *) NULL,
+ var = Tcl_FindNamespaceVar(interp, varName, (Tcl_Namespace *) cxtNsPtr,
flags & ~TCL_LEAVE_ERR_MSG);
if (var != (Tcl_Var) NULL) {
varPtr = (Var *) var;
}
if (varPtr == NULL) {
- if (createPart1) { /* var wasn't found so create it */
- TclGetNamespaceForQualName(interp, part1, (Namespace *) NULL,
+ if (create) { /* var wasn't found so create it */
+ TclGetNamespaceForQualName(interp, varName, cxtNsPtr,
flags, &varNsPtr, &dummy1Ptr, &dummy2Ptr, &tail);
-
if (varNsPtr == NULL) {
- if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, badNamespace);
- }
- goto done;
+ *errMsgPtr = badNamespace;
+ return NULL;
}
if (tail == NULL) {
- if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, missingName);
- }
- goto done;
+ *errMsgPtr = missingName;
+ return NULL;
}
hPtr = Tcl_CreateHashEntry(&varNsPtr->varTable, tail, &new);
varPtr = NewVar();
Tcl_SetHashValue(hPtr, varPtr);
varPtr->hPtr = hPtr;
varPtr->nsPtr = varNsPtr;
- } else { /* var wasn't found and not to create it */
- if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, noSuchVar);
+ if ((lookGlobal) || (varNsPtr == NULL)) {
+ /*
+ * 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;
}
- goto done;
+ } else { /* var wasn't found and not to create it */
+ *errMsgPtr = noSuchVar;
+ return NULL;
}
}
} else { /* local var: look in frame varFramePtr */
@@ -315,143 +783,170 @@ TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
int localCt = procPtr->numCompiledLocals;
CompiledLocal *localPtr = procPtr->firstLocalPtr;
Var *localVarPtr = varFramePtr->compiledLocals;
- int part1Len = strlen(part1);
+ int varNameLen = strlen(varName);
for (i = 0; i < localCt; i++) {
if (!TclIsVarTemporary(localPtr)) {
register char *localName = localVarPtr->name;
- if ((part1[0] == localName[0])
- && (part1Len == localPtr->nameLength)
- && (strcmp(part1, localName) == 0)) {
- varPtr = localVarPtr;
- break;
+ if ((varName[0] == localName[0])
+ && (varNameLen == localPtr->nameLength)
+ && (strcmp(varName, localName) == 0)) {
+ *indexPtr = i;
+ return localVarPtr;
}
}
localVarPtr++;
localPtr = localPtr->nextPtr;
}
- if (varPtr == NULL) { /* look in the frame's var hash table */
- tablePtr = varFramePtr->varTablePtr;
- if (createPart1) {
- if (tablePtr == NULL) {
- tablePtr = (Tcl_HashTable *)
- ckalloc(sizeof(Tcl_HashTable));
- Tcl_InitHashTable(tablePtr, TCL_STRING_KEYS);
- varFramePtr->varTablePtr = tablePtr;
- }
- hPtr = Tcl_CreateHashEntry(tablePtr, part1, &new);
- if (new) {
- varPtr = NewVar();
- Tcl_SetHashValue(hPtr, varPtr);
- varPtr->hPtr = hPtr;
- varPtr->nsPtr = NULL; /* a local variable */
- } else {
- varPtr = (Var *) Tcl_GetHashValue(hPtr);
- }
+ tablePtr = varFramePtr->varTablePtr;
+ if (create) {
+ if (tablePtr == NULL) {
+ tablePtr = (Tcl_HashTable *)
+ ckalloc(sizeof(Tcl_HashTable));
+ Tcl_InitHashTable(tablePtr, TCL_STRING_KEYS);
+ varFramePtr->varTablePtr = tablePtr;
+ }
+ hPtr = Tcl_CreateHashEntry(tablePtr, varName, &new);
+ if (new) {
+ varPtr = NewVar();
+ Tcl_SetHashValue(hPtr, varPtr);
+ varPtr->hPtr = hPtr;
+ varPtr->nsPtr = NULL; /* a local variable */
} else {
- hPtr = NULL;
- if (tablePtr != NULL) {
- hPtr = Tcl_FindHashEntry(tablePtr, part1);
- }
- if (hPtr == NULL) {
- if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, noSuchVar);
- }
- goto done;
- }
varPtr = (Var *) Tcl_GetHashValue(hPtr);
}
+ } else {
+ hPtr = NULL;
+ if (tablePtr != NULL) {
+ hPtr = Tcl_FindHashEntry(tablePtr, varName);
+ }
+ if (hPtr == NULL) {
+ *errMsgPtr = noSuchVar;
+ return NULL;
+ }
+ varPtr = (Var *) Tcl_GetHashValue(hPtr);
}
}
+ return varPtr;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclLookupArrayElement --
+ *
+ * This procedure 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.
+ *
+ *----------------------------------------------------------------------
+ */
- lookupVarPart2:
- /*
- * If varPtr is a link variable, we have a reference to some variable
- * that was created through an "upvar" or "global" command. Traverse
- * through any links until we find the referenced variable.
- */
-
- while (TclIsVarLink(varPtr)) {
- varPtr = varPtr->value.linkPtr;
- }
-
- /*
- * If we're not dealing with an array element, return varPtr.
- */
-
- if (elName == NULL) {
- goto done;
- }
+Var *
+TclLookupArrayElement(interp, arrayName, elName, flags, msg, createArray, createElem, arrayPtr)
+ Tcl_Interp *interp; /* Interpreter to use for lookup. */
+ CONST char *arrayName; /* This is the name of the array. */
+ CONST char *elName; /* 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. */
+{
+ Tcl_HashEntry *hPtr;
+ int new;
+ Var *varPtr;
/*
* We're dealing with an array element. Make sure the variable is an
* array and look up the element (create the element if desired).
*/
- if (TclIsVarUndefined(varPtr) && !TclIsVarArrayElement(varPtr)) {
- if (!createPart1) {
+ if (TclIsVarUndefined(arrayPtr) && !TclIsVarArrayElement(arrayPtr)) {
+ if (!createArray) {
if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, noSuchVar);
+ VarErrMsg(interp, arrayName, elName, msg, noSuchVar);
}
- varPtr = NULL;
- goto done;
+ return NULL;
}
/*
* Make sure we are not resurrecting a namespace variable from a
* deleted namespace!
*/
- if ((varPtr->flags & VAR_IN_HASHTABLE) && (varPtr->hPtr == NULL)) {
+ if ((arrayPtr->flags & VAR_IN_HASHTABLE) && (arrayPtr->hPtr == NULL)) {
if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, danglingVar);
+ VarErrMsg(interp, arrayName, elName, msg, danglingVar);
}
- varPtr = NULL;
- goto done;
+ return NULL;
}
- TclSetVarArray(varPtr);
- TclClearVarUndefined(varPtr);
- varPtr->value.tablePtr =
+ TclSetVarArray(arrayPtr);
+ TclClearVarUndefined(arrayPtr);
+ arrayPtr->value.tablePtr =
(Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
- Tcl_InitHashTable(varPtr->value.tablePtr, TCL_STRING_KEYS);
- } else if (!TclIsVarArray(varPtr)) {
+ Tcl_InitHashTable(arrayPtr->value.tablePtr, TCL_STRING_KEYS);
+ } else if (!TclIsVarArray(arrayPtr)) {
if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, needArray);
+ VarErrMsg(interp, arrayName, elName, msg, needArray);
}
- varPtr = NULL;
- goto done;
+ return NULL;
}
- *arrayPtrPtr = varPtr;
- if (createPart2) {
- hPtr = Tcl_CreateHashEntry(varPtr->value.tablePtr, elName, &new);
+
+ if (createElem) {
+ hPtr = Tcl_CreateHashEntry(arrayPtr->value.tablePtr, elName, &new);
if (new) {
- if (varPtr->searchPtr != NULL) {
- DeleteSearches(varPtr);
+ if (arrayPtr->searchPtr != NULL) {
+ DeleteSearches(arrayPtr);
}
varPtr = NewVar();
Tcl_SetHashValue(hPtr, varPtr);
varPtr->hPtr = hPtr;
- varPtr->nsPtr = varNsPtr;
+ varPtr->nsPtr = arrayPtr->nsPtr;
TclSetVarArrayElement(varPtr);
}
} else {
- hPtr = Tcl_FindHashEntry(varPtr->value.tablePtr, elName);
+ hPtr = Tcl_FindHashEntry(arrayPtr->value.tablePtr, elName);
if (hPtr == NULL) {
if (flags & TCL_LEAVE_ERR_MSG) {
- VarErrMsg(interp, part1, elName, msg, noSuchElement);
+ VarErrMsg(interp, arrayName, elName, msg, noSuchElement);
}
- varPtr = NULL;
- goto done;
+ return NULL;
}
}
- varPtr = (Var *) Tcl_GetHashValue(hPtr);
-
- done:
- if (openParen != NULL) {
- *openParen = '(';
- *closeParen = ')';
- }
- return varPtr;
+ return (Var *) Tcl_GetHashValue(hPtr);
}
/*
@@ -531,6 +1026,58 @@ Tcl_GetVar2(interp, part1, part2, flags)
}
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(interp, part1, part2, flags)
+ Tcl_Interp *interp; /* Command interpreter in which variable is
+ * to be looked up. */
+ 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. */
+{
+ Var *varPtr, *arrayPtr;
+
+ /*
+ * We need a special flag check to see if we want to create part 1,
+ * because commands like lappend require read traces to trigger for
+ * previously non-existent values.
+ */
+ varPtr = TclLookupVar(interp, part1, part2, flags, "read",
+ /*createPart1*/ (flags & TCL_TRACE_READS),
+ /*createPart2*/ 1, &arrayPtr);
+ if (varPtr == NULL) {
+ return NULL;
+ }
+
+ return TclPtrGetVar(interp, varPtr, arrayPtr, part1, part2, flags);
+}
+
/*
*----------------------------------------------------------------------
*
@@ -567,32 +1114,41 @@ Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags)
int flags; /* OR-ed combination of TCL_GLOBAL_ONLY and
* TCL_LEAVE_ERR_MSG bits. */
{
+ Var *varPtr, *arrayPtr;
char *part1, *part2;
part1 = Tcl_GetString(part1Ptr);
- if (part2Ptr != NULL) {
- part2 = Tcl_GetString(part2Ptr);
- } else {
- part2 = NULL;
- }
+ part2 = ((part2Ptr == NULL) ? NULL : Tcl_GetString(part2Ptr));
- return Tcl_GetVar2Ex(interp, part1, part2, flags);
+ /*
+ * We need a special flag check to see if we want to create part 1,
+ * because commands like lappend require read traces to trigger for
+ * previously non-existent values.
+ */
+ varPtr = TclObjLookupVar(interp, part1Ptr, part2, flags, "read",
+ /*createPart1*/ (flags & TCL_TRACE_READS),
+ /*createPart2*/ 1, &arrayPtr);
+ if (varPtr == NULL) {
+ return NULL;
+ }
+
+ return TclPtrGetVar(interp, varPtr, arrayPtr, part1, part2, flags);
}
/*
*----------------------------------------------------------------------
*
- * Tcl_GetVar2Ex --
+ * TclPtrGetVar --
*
- * Return the value of a Tcl variable as a Tcl object, given a
- * two-part name consisting of array name and element within array.
+ * 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 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.
+ * 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
@@ -603,32 +1159,21 @@ Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags)
*/
Tcl_Obj *
-Tcl_GetVar2Ex(interp, part1, part2, flags)
+TclPtrGetVar(interp, varPtr, arrayPtr, part1, part2, flags)
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. */
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,
+ CONST int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
* and TCL_LEAVE_ERR_MSG bits. */
{
Interp *iPtr = (Interp *) interp;
- register Var *varPtr;
- Var *arrayPtr;
- char *msg;
-
- /*
- * We need a special flag check to see if we want to create part 1,
- * because commands like lappend require read traces to trigger for
- * previously non-existent values.
- */
- varPtr = TclLookupVar(interp, part1, part2, flags, "read",
- /*createPart1*/ (flags & TCL_TRACE_READS),
- /*createPart2*/ 1, &arrayPtr);
- if (varPtr == NULL) {
- return NULL;
- }
+ CONST char *msg;
/*
* Invoke any traces that have been set for the variable.
@@ -719,7 +1264,7 @@ TclGetIndexedScalar(interp, localIndex, flags)
register Var *varPtr; /* Points to the variable's in-frame Var
* structure. */
char *varName; /* Name of the local variable. */
- char *msg;
+ CONST char *msg;
#ifdef TCL_COMPILE_DEBUG
int localCt = varFramePtr->procPtr->numCompiledLocals;
@@ -833,7 +1378,7 @@ TclGetElementOfIndexedArray(interp, localIndex, elemPtr, flags)
Var *varPtr = NULL; /* Points to the element's Var structure
* that we return. Initialized to avoid
* compiler warning. */
- char *elem, *msg;
+ CONST char *elem, *msg;
int new;
#ifdef TCL_COMPILE_DEBUG
@@ -1097,9 +1642,73 @@ Tcl_SetVar2(interp, part1, part2, newValue, flags)
/*
*----------------------------------------------------------------------
*
+ * 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(interp, part1, part2, newValuePtr, flags)
+ Tcl_Interp *interp; /* Command interpreter in which variable is
+ * to be found. */
+ 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. */
+{
+ Var *varPtr, *arrayPtr;
+
+ varPtr = TclLookupVar(interp, part1, part2, flags, "set",
+ /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
+ if (varPtr == NULL) {
+ return NULL;
+ }
+
+ return TclPtrSetVar(interp, varPtr, arrayPtr, part1, part2,
+ newValuePtr, flags);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
* Tcl_ObjSetVar2 --
*
- * This function is the same as Tcl_SetVar2Ex below, except the
+ * This function is the same as Tcl_SetVar2Ex above, except the
* variable names are passed in Tcl object instead of strings.
*
* Results:
@@ -1114,7 +1723,6 @@ Tcl_SetVar2(interp, part1, part2, newValue, flags)
* 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.
-
*
*----------------------------------------------------------------------
*/
@@ -1135,27 +1743,31 @@ Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, newValuePtr, flags)
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
* TCL_LIST_ELEMENT, or TCL_LEAVE_ERR_MSG. */
{
+ Var *varPtr, *arrayPtr;
char *part1, *part2;
- part1 = Tcl_GetString(part1Ptr);
- if (part2Ptr != NULL) {
- part2 = Tcl_GetString(part2Ptr);
- } else {
- part2 = NULL;
+ part1 = TclGetString(part1Ptr);
+ part2 = ((part2Ptr == NULL) ? NULL : Tcl_GetString(part2Ptr));
+
+ varPtr = TclObjLookupVar(interp, part1Ptr, part2, flags, "set",
+ /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
+ if (varPtr == NULL) {
+ return NULL;
}
-
- return Tcl_SetVar2Ex(interp, part1, part2, newValuePtr, flags);
+
+ return TclPtrSetVar(interp, varPtr, arrayPtr, part1, part2,
+ newValuePtr, flags);
}
+
/*
*----------------------------------------------------------------------
*
- * Tcl_SetVar2Ex --
+ * TclPtrSetVar --
*
- * 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.
+ * 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
@@ -1169,49 +1781,30 @@ Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, newValuePtr, flags)
* 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(interp, part1, part2, newValuePtr, flags)
+TclPtrSetVar(interp, varPtr, arrayPtr, part1, part2, newValuePtr, flags)
Tcl_Interp *interp; /* Command interpreter in which variable is
- * to be found. */
+ * to be looked up. */
+ register Var *varPtr;
+ Var *arrayPtr;
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. */
+ CONST int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
+ * and TCL_LEAVE_ERR_MSG bits. */
{
Interp *iPtr = (Interp *) interp;
- register Var *varPtr;
- Var *arrayPtr;
Tcl_Obj *oldValuePtr;
Tcl_Obj *resultPtr = NULL;
int result;
- varPtr = TclLookupVar(interp, part1, part2, flags, "set",
- /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
- if (varPtr == NULL) {
- return NULL;
- }
-
/*
* 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
@@ -1903,13 +2496,73 @@ TclIncrVar2(interp, part1Ptr, part2Ptr, incrAmount, flags)
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
* TCL_LIST_ELEMENT, TCL_LEAVE_ERR_MSG. */
{
+ Var *varPtr, *arrayPtr;
+ char *part1, *part2;
+
+ part1 = TclGetString(part1Ptr);
+ part2 = ((part2Ptr == NULL)? NULL : TclGetString(part2Ptr));
+
+ varPtr = TclObjLookupVar(interp, part1Ptr, part2, flags, "read", 0, 1, &arrayPtr);
+ if (varPtr == NULL) {
+ Tcl_AddObjErrorInfo(interp,
+ "\n (reading value of variable to increment)", -1);
+ return NULL;
+ }
+ return TclPtrIncrVar(interp, varPtr, arrayPtr, part1, part2, incrAmount, flags);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclPtrIncrVar --
+ *
+ * Given the pointers to a variable and possible containing array,
+ * increment the Tcl object value of the variable by a specified
+ * amount.
+ *
+ * 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 *
+TclPtrIncrVar(interp, varPtr, arrayPtr, part1, part2, incrAmount, flags)
+ Tcl_Interp *interp; /* Command interpreter in which variable is
+ * to be found. */
+ Var *varPtr;
+ Var *arrayPtr;
+ char *part1; /* Points to an object holding the name of
+ * an array (if part2 is non-NULL) or the
+ * name of a variable. */
+ CONST char *part2; /* If non-null, points to an object holding
+ * the name of an element in the array
+ * part1Ptr. */
+ long incrAmount; /* 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. */
+{
register Tcl_Obj *varValuePtr;
int createdNewObj; /* Set 1 if var's value object is shared
* so we must increment a copy (i.e. copy
* on write). */
long i;
- varValuePtr = Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags);
+ varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1, part2, flags);
+
if (varValuePtr == NULL) {
Tcl_AddObjErrorInfo(interp,
"\n (reading value of variable to increment)", -1);
@@ -1967,7 +2620,7 @@ TclIncrVar2(interp, part1Ptr, part2Ptr, incrAmount, flags)
* Store the variable's new value and run any write traces.
*/
- return Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, varValuePtr, flags);
+ return TclPtrSetVar(interp, varPtr, arrayPtr, part1, part2, varValuePtr, flags);
}
/*
@@ -2244,6 +2897,49 @@ Tcl_UnsetVar2(interp, part1, part2, flags)
* TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
* TCL_LEAVE_ERR_MSG. */
{
+ int result;
+ Tcl_Obj *part1Ptr;
+
+ part1Ptr = Tcl_NewStringObj(part1, -1);
+ Tcl_IncrRefCount(part1Ptr);
+ result = TclObjUnsetVar2(interp, part1Ptr, part2, flags);
+ TclDecrRefCount(part1Ptr);
+
+ 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(interp, part1Ptr, part2, flags)
+ Tcl_Interp *interp; /* Command interpreter in which varName is
+ * to be looked up. */
+ Tcl_Obj *part1Ptr; /* 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. */
+{
Var dummyVar;
Var *varPtr, *dummyVarPtr;
Interp *iPtr = (Interp *) interp;
@@ -2251,12 +2947,15 @@ Tcl_UnsetVar2(interp, part1, part2, flags)
ActiveVarTrace *activePtr;
Tcl_Obj *objPtr;
int result;
+ char *part1;
- varPtr = TclLookupVar(interp, part1, part2, flags, "unset",
+ part1 = TclGetString(part1Ptr);
+ varPtr = TclObjLookupVar(interp, part1Ptr, part2, flags, "unset",
/*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
if (varPtr == NULL) {
return TCL_ERROR;
}
+
result = (TclIsVarUndefined(varPtr)? TCL_ERROR : TCL_OK);
if ((arrayPtr != NULL) && (arrayPtr->searchPtr != NULL)) {
@@ -2808,8 +3507,7 @@ Tcl_UnsetObjCmd(dummy, interp, objc, objv)
}
for (; i < objc; i++) {
- name = TclGetString(objv[i]);
- if ((Tcl_UnsetVar2(interp, name, (char *) NULL, flags) != TCL_OK)
+ if ((TclObjUnsetVar2(interp, objv[i], NULL, flags) != TCL_OK)
&& (flags == TCL_LEAVE_ERR_MSG)) {
return TCL_ERROR;
}
@@ -2842,6 +3540,9 @@ Tcl_AppendObjCmd(dummy, interp, objc, objv)
int objc; /* Number of arguments. */
Tcl_Obj *CONST objv[]; /* Argument objects. */
{
+ Var *varPtr, *arrayPtr;
+ char *part1;
+
register Tcl_Obj *varValuePtr = NULL;
/* Initialized to avoid compiler
* warning. */
@@ -2851,15 +3552,29 @@ Tcl_AppendObjCmd(dummy, interp, objc, objv)
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 {
- for (i = 2; i < objc; i++) {
- varValuePtr = Tcl_ObjSetVar2(interp, objv[1], (Tcl_Obj *) NULL,
- objv[i], (TCL_APPEND_VALUE | TCL_LEAVE_ERR_MSG));
+ varPtr = TclObjLookupVar(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG, "set",
+ /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
+ part1 = TclGetString(objv[1]);
+ 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, part1, NULL,
+ objv[i], (TCL_APPEND_VALUE | TCL_LEAVE_ERR_MSG));
if (varValuePtr == NULL) {
return TCL_ERROR;
}
@@ -2898,6 +3613,8 @@ Tcl_LappendObjCmd(dummy, interp, objc, objv)
register List *listRepPtr;
register Tcl_Obj **elemPtrs;
int numElems, numRequired, createdNewObj, createVar, i, j;
+ Var *varPtr, *arrayPtr;
+ char *part1;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?");
@@ -2932,12 +3649,33 @@ Tcl_LappendObjCmd(dummy, interp, objc, objv)
createdNewObj = 0;
createVar = 1;
+
/*
* Use the TCL_TRACE_READS flag to ensure that if we have an
* array with no elements set yet, but with a read trace on it,
* we will create the variable and get read traces triggered.
+ * Note that you have to protect the variable pointers around
+ * the TclPtrGetVar call to insure that they remain valid
+ * even if the variable was undefined and unused.
*/
- varValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL, TCL_TRACE_READS);
+
+ varPtr = TclObjLookupVar(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG, "set",
+ /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
+ if (varPtr == NULL) {
+ return TCL_ERROR;
+ }
+ varPtr->refCount++;
+ if (arrayPtr != NULL) {
+ arrayPtr->refCount++;
+ }
+ part1 = TclGetString(objv[1]);
+ varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1, NULL,
+ (TCL_TRACE_READS | TCL_LEAVE_ERR_MSG));
+ varPtr->refCount--;
+ if (arrayPtr != NULL) {
+ arrayPtr->refCount--;
+ }
+
if (varValuePtr == NULL) {
/*
* We couldn't read the old value: either the var doesn't yet
@@ -2945,24 +3683,7 @@ Tcl_LappendObjCmd(dummy, interp, objc, objv)
* create it with Tcl_ObjSetVar2 below.
*/
- char *p, *varName;
- int nameBytes, i;
-
- varName = Tcl_GetStringFromObj(objv[1], &nameBytes);
- for (i = 0, p = varName; i < nameBytes; i++, p++) {
- if (*p == '(') {
- p = (varName + nameBytes-1);
- if (*p == ')') { /* last char is ')' => array ref */
- /*
- * This case occurs when we tried something like:
- set x ""
- lappend x(0) 44
- */
- createVar = 0;
- }
- break;
- }
- }
+ createVar = (TclIsVarUndefined(varPtr));
varValuePtr = Tcl_NewObj();
createdNewObj = 1;
} else if (Tcl_IsShared(varValuePtr)) {
@@ -3029,8 +3750,8 @@ Tcl_LappendObjCmd(dummy, interp, objc, objv)
* was new and we didn't create the variable.
*/
- newValuePtr = Tcl_ObjSetVar2(interp, objv[1], NULL, varValuePtr,
- TCL_LEAVE_ERR_MSG);
+ newValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, part1, NULL,
+ varValuePtr, TCL_LEAVE_ERR_MSG);
if (newValuePtr == NULL) {
if (createdNewObj && !createVar) {
Tcl_DecrRefCount(varValuePtr); /* free unneeded obj */
@@ -3089,7 +3810,7 @@ Tcl_ArrayObjCmd(dummy, interp, objc, objv)
Interp *iPtr = (Interp *) interp;
Var *varPtr, *arrayPtr;
Tcl_HashEntry *hPtr;
- Tcl_Obj *resultPtr;
+ Tcl_Obj *resultPtr, *varNamePtr;
int notArray;
char *varName;
int index, result;
@@ -3109,8 +3830,9 @@ Tcl_ArrayObjCmd(dummy, interp, objc, objv)
* Locate the array variable
*/
- varName = TclGetString(objv[2]);
- varPtr = TclLookupVar(interp, varName, (char *) NULL, /*flags*/ 0,
+ varNamePtr = objv[2];
+ varName = TclGetString(varNamePtr);
+ varPtr = TclObjLookupVar(interp, varNamePtr, NULL, /*flags*/ 0,
/*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
/*
@@ -3528,7 +4250,7 @@ Tcl_ArrayObjCmd(dummy, interp, objc, objv)
/*
* When no pattern is given, just unset the whole array
*/
- if (Tcl_UnsetVar2(interp, varName, (char *) NULL, 0)
+ if (TclObjUnsetVar2(interp, varNamePtr, NULL, 0)
!= TCL_OK) {
return TCL_ERROR;
}
@@ -3543,7 +4265,7 @@ Tcl_ArrayObjCmd(dummy, interp, objc, objv)
}
name = Tcl_GetHashKey(varPtr->value.tablePtr, hPtr);
if (Tcl_StringMatch(name, pattern) &&
- (Tcl_UnsetVar2(interp, varName, name, 0)
+ (TclObjUnsetVar2(interp, varNamePtr, name, 0)
!= TCL_OK)) {
return TCL_ERROR;
}
@@ -3587,26 +4309,25 @@ TclArraySet(interp, arrayNameObj, arrayElemObj)
{
Var *varPtr, *arrayPtr;
Tcl_Obj **elemPtrs;
- int result, elemLen, i;
+ int result, elemLen, i, nameLen;
char *varName, *p;
- varName = TclGetString(arrayNameObj);
- for (p = varName; *p ; p++) {
- if (*p == '(') {
- do {
- p++;
- } while (*p != '\0');
- p--;
- if (*p == ')') {
+ varName = Tcl_GetStringFromObj(arrayNameObj, &nameLen);
+ p = varName + nameLen - 1;
+ if (*p == ')') {
+ while (--p >= varName) {
+ if (*p == '(') {
VarErrMsg(interp, varName, NULL, "set", needArray);
return TCL_ERROR;
}
- break;
}
}
- varPtr = TclLookupVar(interp, varName, (char *) NULL, /*flags*/ 0,
- /*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
+ varPtr = TclObjLookupVar(interp, arrayNameObj, NULL, /*flags*/ TCL_LEAVE_ERR_MSG,
+ /*msg*/ "set", /*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr);
+ if (varPtr == NULL) {
+ return TCL_ERROR;
+ }
if (arrayElemObj != NULL) {
result = Tcl_ListObjGetElements(interp, arrayElemObj,
@@ -3621,9 +4342,19 @@ TclArraySet(interp, arrayNameObj, arrayElemObj)
return TCL_ERROR;
}
if (elemLen > 0) {
+ /*
+ * 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.
+ */
+
for (i = 0; i < elemLen; i += 2) {
- if (Tcl_ObjSetVar2(interp, arrayNameObj, elemPtrs[i],
- elemPtrs[i+1], TCL_LEAVE_ERR_MSG) == NULL) {
+ char *part2 = TclGetString(elemPtrs[i]);
+ Var *elemVarPtr = TclLookupArrayElement(interp, varName,
+ part2, TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr);
+ if ((elemVarPtr == NULL) ||
+ (TclPtrSetVar(interp, elemVarPtr, varPtr, varName, part2,
+ elemPtrs[i+1], TCL_LEAVE_ERR_MSG) == NULL)) {
result = TCL_ERROR;
break;
}
@@ -3653,22 +4384,6 @@ TclArraySet(interp, arrayNameObj, arrayElemObj)
VarErrMsg(interp, varName, (char *)NULL, "array set", needArray);
return TCL_ERROR;
}
- } else {
- /*
- * Create variable for new array.
- */
-
- varPtr = TclLookupVar(interp, varName, (char *) NULL,
- TCL_LEAVE_ERR_MSG, "set",
- /*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr);
-
- /*
- * Still couldn't do it - this can occur if a non-existent
- * namespace was specified
- */
- if (varPtr == NULL) {
- return TCL_ERROR;
- }
}
TclSetVarArray(varPtr);
TclClearVarUndefined(varPtr);
@@ -3681,7 +4396,7 @@ TclArraySet(interp, arrayNameObj, arrayElemObj)
/*
*----------------------------------------------------------------------
*
- * MakeUpvar --
+ * ObjMakeUpvar --
*
* This procedure does all of the work of the "global" and "upvar"
* commands.
@@ -3699,159 +4414,101 @@ TclArraySet(interp, arrayNameObj, arrayElemObj)
*/
static int
-MakeUpvar(iPtr, framePtr, otherP1, otherP2, otherFlags, myName, myFlags)
- Interp *iPtr; /* Interpreter containing variables. Used
- * for error messages, too. */
+ObjMakeUpvar(interp, framePtr, otherP1Ptr, otherP2, otherFlags, myName, myFlags, index)
+ Tcl_Interp *interp; /* Interpreter containing variables. Used
+ * for error messages, too. */
CallFrame *framePtr; /* Call frame containing "other" variable.
* NULL means use global :: context. */
- char *otherP1;
+ Tcl_Obj *otherP1Ptr;
CONST char *otherP2; /* Two-part name of variable in framePtr. */
- int otherFlags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
+ CONST int otherFlags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of "other" variable. */
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:
+ CONST 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_HashEntry *hPtr;
+ Interp *iPtr = (Interp *) interp;
Var *otherPtr, *varPtr, *arrayPtr;
CallFrame *varFramePtr;
- CallFrame *savedFramePtr = NULL; /* Init. to avoid compiler warning. */
- Tcl_HashTable *tablePtr;
- Namespace *nsPtr, *altNsPtr, *dummyNsPtr;
- CONST char *tail;
- int new;
+ CONST char *errMsg;
/*
* 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 TclLookupVar.
+ * pointer in the interpreter in order to use TclObjLookupVar.
*/
+ varFramePtr = iPtr->varFramePtr;
if (!(otherFlags & TCL_NAMESPACE_ONLY)) {
- savedFramePtr = iPtr->varFramePtr;
iPtr->varFramePtr = framePtr;
}
- otherPtr = TclLookupVar((Tcl_Interp *) iPtr, otherP1, otherP2,
+ otherPtr = TclObjLookupVar(interp, otherP1Ptr, otherP2,
(otherFlags | TCL_LEAVE_ERR_MSG), "access",
/*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
if (!(otherFlags & TCL_NAMESPACE_ONLY)) {
- iPtr->varFramePtr = savedFramePtr;
+ iPtr->varFramePtr = varFramePtr;
}
if (otherPtr == NULL) {
return TCL_ERROR;
}
- /*
- * Now create a hashtable entry for "myName". Create it as either a
- * namespace variable or as a local variable in a procedure call
- * frame. Interpret myName 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).
- * If creating myName in the active procedure, look first in the
- * frame's array of compiler-allocated local variables, then in its
- * hashtable for runtime-created local variables. Create that
- * procedure's local variable hashtable if necessary.
- */
-
- varFramePtr = iPtr->varFramePtr;
- if ((myFlags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY))
- || (varFramePtr == NULL)
- || !varFramePtr->isProcCallFrame
- || (strstr(myName, "::") != NULL)) {
- TclGetNamespaceForQualName((Tcl_Interp *) iPtr, myName,
- (Namespace *) NULL, myFlags, &nsPtr, &altNsPtr, &dummyNsPtr, &tail);
-
- if (nsPtr == NULL) {
- nsPtr = altNsPtr;
- }
- if (nsPtr == NULL) {
- Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
- myName, "\": unknown namespace", (char *) NULL);
- return TCL_ERROR;
- }
-
+ if (index >= 0) {
+ if (!varFramePtr->isProcCallFrame) {
+ panic("ObjMakeUpVar called with an index outside from a proc.\n");
+ }
+ varPtr = &(varFramePtr->compiledLocals[index]);
+ } else {
/*
* 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 ((otherP2 ? arrayPtr->nsPtr : otherPtr->nsPtr) == NULL) {
+
+ if (((otherP2 ? arrayPtr->nsPtr : otherPtr->nsPtr) == NULL)
+ && ((myFlags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY))
+ || (varFramePtr == NULL)
+ || !varFramePtr->isProcCallFrame
+ || (strstr(myName, "::") != NULL))) {
Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
- myName, "\": upvar won't create namespace variable that refers to procedure variable",
- (char *) NULL);
- return TCL_ERROR;
- }
+ myName, "\": upvar won't create namespace variable that refers to procedure variable",
+ (char *) NULL);
+ return TCL_ERROR;
+ }
- hPtr = Tcl_CreateHashEntry(&nsPtr->varTable, tail, &new);
- if (new) {
- varPtr = NewVar();
- Tcl_SetHashValue(hPtr, varPtr);
- varPtr->hPtr = hPtr;
- varPtr->nsPtr = nsPtr;
- } else {
- varPtr = (Var *) Tcl_GetHashValue(hPtr);
+ /*
+ * Lookup and eventually create the new variable.
+ */
+
+ varPtr = TclLookupSimpleVar(interp, myName, myFlags, /*create*/ 1,
+ &errMsg, &index);
+ if (varPtr == NULL) {
+ VarErrMsg(interp, myName, NULL, "create", errMsg);
+ return TCL_ERROR;
}
- } else { /* look in the call frame */
- Proc *procPtr = varFramePtr->procPtr;
- int localCt = procPtr->numCompiledLocals;
- CompiledLocal *localPtr = procPtr->firstLocalPtr;
- Var *localVarPtr = varFramePtr->compiledLocals;
- int nameLen = strlen(myName);
- int i;
+ }
- varPtr = NULL;
- for (i = 0; i < localCt; i++) {
- if (!TclIsVarTemporary(localPtr)) {
- char *localName = localVarPtr->name;
- if ((myName[0] == localName[0])
- && (nameLen == localPtr->nameLength)
- && (strcmp(myName, localName) == 0)) {
- varPtr = localVarPtr;
- new = 0;
- break;
- }
- }
- localVarPtr++;
- localPtr = localPtr->nextPtr;
- }
- if (varPtr == NULL) { /* look in frame's local var hashtable */
- tablePtr = varFramePtr->varTablePtr;
- if (tablePtr == NULL) {
- tablePtr = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
- Tcl_InitHashTable(tablePtr, TCL_STRING_KEYS);
- varFramePtr->varTablePtr = tablePtr;
- }
- hPtr = Tcl_CreateHashEntry(tablePtr, myName, &new);
- if (new) {
- varPtr = NewVar();
- Tcl_SetHashValue(hPtr, varPtr);
- varPtr->hPtr = hPtr;
- varPtr->nsPtr = varFramePtr->nsPtr;
- } else {
- varPtr = (Var *) Tcl_GetHashValue(hPtr);
- }
- }
+ if (varPtr == otherPtr) {
+ Tcl_SetResult((Tcl_Interp *) iPtr,
+ "can't upvar from variable to itself", TCL_STATIC);
+ return TCL_ERROR;
}
- if (!new) {
+ if (varPtr->tracePtr != NULL) {
+ Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
+ "\" has traces: can't use for upvar", (char *) NULL);
+ return TCL_ERROR;
+ } else if (!TclIsVarUndefined(varPtr)) {
/*
- * The variable already exists. Make sure this variable "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 (varPtr == otherPtr) {
- Tcl_SetResult((Tcl_Interp *) iPtr,
- "can't upvar from variable to itself", TCL_STATIC);
- return TCL_ERROR;
- }
if (TclIsVarLink(varPtr)) {
Var *linkPtr = varPtr->value.linkPtr;
if (linkPtr == otherPtr) {
@@ -3861,14 +4518,10 @@ MakeUpvar(iPtr, framePtr, otherP1, otherP2, otherFlags, myName, myFlags)
if (TclIsVarUndefined(linkPtr)) {
CleanupVar(linkPtr, (Var *) NULL);
}
- } else if (!TclIsVarUndefined(varPtr)) {
+ } else {
Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
"\" already exists", (char *) NULL);
return TCL_ERROR;
- } else if (varPtr->tracePtr != NULL) {
- Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
- "\" has traces: can't use for upvar", (char *) NULL);
- return TCL_ERROR;
}
}
TclSetVarLink(varPtr);
@@ -3912,43 +4565,7 @@ Tcl_UpVar(interp, frameName, varName, localName, flags)
int flags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
* indicates scope of localName. */
{
- int result;
- CallFrame *framePtr;
- register char *p;
-
- result = TclGetFrame(interp, frameName, &framePtr);
- if (result == -1) {
- return TCL_ERROR;
- }
-
- /*
- * Figure out whether varName is an array reference, then call
- * MakeUpvar to do all the real work.
- */
-
- for (p = varName; *p != '\0'; p++) {
- if (*p == '(') {
- char *openParen = p;
- do {
- p++;
- } while (*p != '\0');
- p--;
- if (*p != ')') {
- goto scalar;
- }
- *openParen = '\0';
- *p = '\0';
- result = MakeUpvar((Interp *) interp, framePtr, varName,
- openParen+1, 0, localName, flags);
- *openParen = '(';
- *p = ')';
- return result;
- }
- }
-
- scalar:
- return MakeUpvar((Interp *) interp, framePtr, varName, (char *) NULL,
- 0, localName, flags);
+ return Tcl_UpVar2(interp, frameName, varName, NULL, localName, flags);
}
/*
@@ -3987,13 +4604,20 @@ Tcl_UpVar2(interp, frameName, part1, part2, localName, flags)
{
int result;
CallFrame *framePtr;
+ Tcl_Obj *part1Ptr;
+
+ part1Ptr = Tcl_NewStringObj(part1, -1);
+ Tcl_IncrRefCount(part1Ptr);
result = TclGetFrame(interp, frameName, &framePtr);
if (result == -1) {
return TCL_ERROR;
}
- return MakeUpvar((Interp *) interp, framePtr, part1, part2, 0,
- localName, flags);
+ result = ObjMakeUpvar(interp, framePtr, part1Ptr, part2, 0,
+ localName, flags, -1);
+
+ TclDecrRefCount(part1Ptr);
+ return result;
}
/*
@@ -4122,9 +4746,9 @@ Tcl_GlobalObjCmd(dummy, interp, objc, objv)
* Link to the variable "varName" in the global :: namespace.
*/
- result = MakeUpvar(iPtr, (CallFrame *) NULL,
- varName, (char *) NULL, /*otherFlags*/ TCL_GLOBAL_ONLY,
- /*myName*/ tail, /*myFlags*/ 0);
+ result = ObjMakeUpvar(interp, (CallFrame *) NULL,
+ objPtr, NULL, /*otherFlags*/ TCL_GLOBAL_ONLY,
+ /*myName*/ tail, /*myFlags*/ 0, -1);
if (result != TCL_OK) {
return result;
}
@@ -4179,6 +4803,7 @@ Tcl_VariableObjCmd(dummy, interp, objc, objv)
Var *varPtr, *arrayPtr;
Tcl_Obj *varValuePtr;
int i, result;
+ Tcl_Obj *varNamePtr;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "?name value...? name ?value?");
@@ -4191,8 +4816,9 @@ Tcl_VariableObjCmd(dummy, interp, objc, objv)
* it if necessary.
*/
- varName = TclGetString(objv[i]);
- varPtr = TclLookupVar(interp, varName, (char *) NULL,
+ varNamePtr = objv[i];
+ varName = TclGetString(varNamePtr);
+ varPtr = TclObjLookupVar(interp, varNamePtr, NULL,
(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), "define",
/*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr);
@@ -4229,7 +4855,7 @@ Tcl_VariableObjCmd(dummy, interp, objc, objv)
*/
if (i+1 < objc) { /* a value was specified */
- varValuePtr = Tcl_ObjSetVar2(interp, objv[i], NULL, objv[i+1],
+ varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, varName, NULL, objv[i+1],
(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG));
if (varValuePtr == NULL) {
return TCL_ERROR;
@@ -4264,10 +4890,10 @@ Tcl_VariableObjCmd(dummy, interp, objc, objv)
* current namespace.
*/
- result = MakeUpvar(iPtr, (CallFrame *) NULL,
- /*otherP1*/ varName, /*otherP2*/ (char *) NULL,
+ result = ObjMakeUpvar(interp, (CallFrame *) NULL,
+ /*otherP1*/ varNamePtr, /*otherP2*/ NULL,
/*otherFlags*/ TCL_NAMESPACE_ONLY,
- /*myName*/ tail, /*myFlags*/ 0);
+ /*myName*/ tail, /*myFlags*/ 0, -1);
if (result != TCL_OK) {
return result;
}
@@ -4301,10 +4927,8 @@ Tcl_UpvarObjCmd(dummy, interp, objc, objv)
int objc; /* Number of arguments. */
Tcl_Obj *CONST objv[]; /* Argument objects. */
{
- register Interp *iPtr = (Interp *) interp;
CallFrame *framePtr;
- char *frameSpec, *otherVarName, *myVarName;
- register char *p;
+ char *frameSpec, *localName;
int result;
if (objc < 3) {
@@ -4337,34 +4961,9 @@ Tcl_UpvarObjCmd(dummy, interp, objc, objv)
*/
for ( ; objc > 0; objc -= 2, objv += 2) {
- myVarName = TclGetString(objv[1]);
- otherVarName = TclGetString(objv[0]);
- for (p = otherVarName; *p != 0; p++) {
- if (*p == '(') {
- char *openParen = p;
-
- do {
- p++;
- } while (*p != '\0');
- p--;
- if (*p != ')') {
- goto scalar;
- }
- *openParen = '\0';
- *p = '\0';
- result = MakeUpvar(iPtr, framePtr,
- otherVarName, openParen+1, /*otherFlags*/ 0,
- myVarName, /*flags*/ 0);
- *openParen = '(';
- *p = ')';
- goto checkResult;
- }
- }
- scalar:
- result = MakeUpvar(iPtr, framePtr, otherVarName, (char *) NULL, 0,
- myVarName, /*flags*/ 0);
-
- checkResult:
+ localName = TclGetString(objv[1]);
+ result = ObjMakeUpvar(interp, framePtr, /* othervarName */ objv[0], NULL,
+ 0, /* myVarName */ localName, /*flags*/ 0, -1);
if (result != TCL_OK) {
return TCL_ERROR;
}
@@ -4443,7 +5042,7 @@ CallVarTraces(iPtr, arrayPtr, varPtr, part1, part2, flags, leaveErrMsg)
* plus other stuff like TCL_GLOBAL_ONLY,
* TCL_NAMESPACE_ONLY, and
* TCL_INTERP_DESTROYED. */
- int leaveErrMsg; /* If true, and one of the traces indicates an
+ CONST int leaveErrMsg; /* If true, and one of the traces indicates an
* error, then leave an error message and stack
* trace information in *iPTr. */
{
@@ -4576,7 +5175,7 @@ CallVarTraces(iPtr, arrayPtr, varPtr, part1, part2, flags, leaveErrMsg)
done:
if (code == TCL_ERROR) {
if (leaveErrMsg) {
- char *type = "";
+ CONST char *type = "";
switch (flags&(TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_ARRAY)) {
case TCL_TRACE_READS: {
type = "read";
@@ -4741,8 +5340,8 @@ SetArraySearchObj(interp, objPtr)
static ArraySearch *
ParseSearchId(interp, varPtr, varName, handleObj)
Tcl_Interp *interp; /* Interpreter containing variable. */
- Var *varPtr; /* Array variable search is for. */
- char *varName; /* Name of array variable that search is
+ CONST Var *varPtr; /* Array variable search is for. */
+ CONST char *varName; /* 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
@@ -5228,11 +5827,11 @@ CleanupVar(varPtr, arrayPtr)
static void
VarErrMsg(interp, part1, part2, operation, reason)
Tcl_Interp *interp; /* Interpreter in which to record message. */
- char *part1;
+ CONST char *part1;
CONST char *part2; /* Variable's two-part name. */
- char *operation; /* String describing operation that failed,
+ CONST char *operation; /* String describing operation that failed,
* e.g. "read", "set", or "unset". */
- char *reason; /* String describing why operation failed. */
+ CONST char *reason; /* String describing why operation failed. */
{
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "can't ", operation, " \"", part1,
@@ -5242,7 +5841,6 @@ VarErrMsg(interp, part1, part2, operation, reason)
}
Tcl_AppendResult(interp, "\": ", reason, (char *) NULL);
}
-
/*
*----------------------------------------------------------------------
@@ -5305,3 +5903,195 @@ TclVarTraceExists(interp, varName)
return varPtr;
}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Internal functions for variable name object types --
+ *
+ *----------------------------------------------------------------------
+ */
+
+/*
+ * localVarName -
+ *
+ * INTERNALREP DEFINITION:
+ * twoPtrValue.ptr1 = pointer to the corresponding Proc
+ * twoPtrValue.ptr2 = index into locals table
+*/
+
+static void
+FreeLocalVarName(objPtr)
+ Tcl_Obj *objPtr;
+{
+ register Proc *procPtr = (Proc *) objPtr->internalRep.twoPtrValue.ptr1;
+ procPtr->refCount--;
+ if (procPtr->refCount <= 0) {
+ TclProcCleanupProc(procPtr);
+ }
+}
+
+static void
+DupLocalVarName(srcPtr, dupPtr)
+ Tcl_Obj *srcPtr;
+ Tcl_Obj *dupPtr;
+{
+ register Proc *procPtr = (Proc *) srcPtr->internalRep.twoPtrValue.ptr1;
+
+ dupPtr->internalRep.twoPtrValue.ptr1 = (VOID *) procPtr;
+ dupPtr->internalRep.twoPtrValue.ptr2 = srcPtr->internalRep.twoPtrValue.ptr2;
+ procPtr->refCount++;
+ dupPtr->typePtr = &tclLocalVarNameType;
+}
+
+static void
+UpdateLocalVarName(objPtr)
+ Tcl_Obj *objPtr;
+{
+ Proc *procPtr = (Proc *) objPtr->internalRep.twoPtrValue.ptr1;
+ unsigned int index = (unsigned int) objPtr->internalRep.twoPtrValue.ptr2;
+ CompiledLocal *localPtr = procPtr->firstLocalPtr;
+ unsigned int nameLen;
+
+ if (localPtr == NULL) {
+ goto emptyName;
+ }
+ while (index--) {
+ localPtr = localPtr->nextPtr;
+ if (localPtr == NULL) {
+ goto emptyName;
+ }
+ }
+
+ nameLen = (unsigned int) localPtr->nameLength;
+ objPtr->bytes = ckalloc(nameLen + 1);
+ memcpy(objPtr->bytes, localPtr->name, nameLen + 1);
+ objPtr->length = nameLen;
+ return;
+
+ emptyName:
+ objPtr->bytes = ckalloc(1);
+ *(objPtr->bytes) = '\0';
+ objPtr->length = 0;
+}
+
+/*
+ * nsVarName -
+ *
+ * INTERNALREP DEFINITION:
+ * twoPtrValue.ptr1: pointer to the namespace containing the
+ * reference.
+ * twoPtrValue.ptr2: pointer to the corresponding Var
+*/
+
+static void
+FreeNsVarName(objPtr)
+ Tcl_Obj *objPtr;
+{
+ register Var *varPtr = (Var *) objPtr->internalRep.twoPtrValue.ptr2;
+
+ varPtr->refCount--;
+ if (TclIsVarUndefined(varPtr) && (varPtr->refCount <= 0)) {
+ if (TclIsVarLink(varPtr)) {
+ Var *linkPtr = varPtr->value.linkPtr;
+ linkPtr->refCount--;
+ if (TclIsVarUndefined(linkPtr) && (linkPtr->refCount <= 0)) {
+ CleanupVar(linkPtr, (Var *) NULL);
+ }
+ }
+ CleanupVar(varPtr, NULL);
+ }
+}
+
+static void
+DupNsVarName(srcPtr, dupPtr)
+ Tcl_Obj *srcPtr;
+ Tcl_Obj *dupPtr;
+{
+ Namespace *nsPtr = (Namespace *) srcPtr->internalRep.twoPtrValue.ptr1;
+ register Var *varPtr = (Var *) srcPtr->internalRep.twoPtrValue.ptr2;
+
+ dupPtr->internalRep.twoPtrValue.ptr1 = (VOID *) nsPtr;
+ dupPtr->internalRep.twoPtrValue.ptr2 = (VOID *) varPtr;
+ varPtr->refCount++;
+ dupPtr->typePtr = &tclNsVarNameType;
+}
+
+/*
+ * parsedVarName -
+ *
+ * INTERNALREP DEFINITION:
+ * twoPtrValue.ptr1 = pointer to the array name Tcl_Obj
+ * (NULL if scalar)
+ * twoPtrValue.ptr2 = pointer to the element name Tcl_Obj
+ * (NULL if scalar)
+ */
+
+static void
+FreeParsedVarName(objPtr)
+ Tcl_Obj *objPtr;
+{
+ register Tcl_Obj *arrayPtr = (Tcl_Obj *) objPtr->internalRep.twoPtrValue.ptr1;
+ register char *elem = (char *) objPtr->internalRep.twoPtrValue.ptr2;
+
+ if (arrayPtr != NULL) {
+ TclDecrRefCount(arrayPtr);
+ ckfree(elem);
+ }
+}
+
+static void
+DupParsedVarName(srcPtr, dupPtr)
+ Tcl_Obj *srcPtr;
+ Tcl_Obj *dupPtr;
+{
+ register Tcl_Obj *arrayPtr = (Tcl_Obj *) srcPtr->internalRep.twoPtrValue.ptr1;
+ register char *elem = (char *) 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';
+
+ dupPtr->internalRep.twoPtrValue.ptr1 = (VOID *) arrayPtr;
+ dupPtr->internalRep.twoPtrValue.ptr2 = (VOID *) elemCopy;
+ dupPtr->typePtr = &tclParsedVarNameType;
+}
+
+static void
+UpdateParsedVarName(objPtr)
+ Tcl_Obj *objPtr;
+{
+ Tcl_Obj *arrayPtr = (Tcl_Obj *) objPtr->internalRep.twoPtrValue.ptr1;
+ char *part2 = (char *) 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?
+ */
+ panic("ERROR: scalar parsedVarName without a string rep.\n");
+ }
+ part1 = Tcl_GetStringFromObj(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';
+}