diff options
Diffstat (limited to 'generic/tclListObj.c')
| -rw-r--r-- | generic/tclListObj.c | 775 |
1 files changed, 416 insertions, 359 deletions
diff --git a/generic/tclListObj.c b/generic/tclListObj.c index 6745f62..3668b45 100644 --- a/generic/tclListObj.c +++ b/generic/tclListObj.c @@ -9,8 +9,6 @@ * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. - * - * RCS: @(#) $Id: tclListObj.c,v 1.60 2010/03/18 20:34:48 dgp Exp $ */ #include "tclInt.h" @@ -19,7 +17,9 @@ * Prototypes for functions defined later in this file: */ -static List * NewListIntRep(int objc, Tcl_Obj *const objv[]); +static List * AttemptNewList(Tcl_Interp *interp, int objc, + Tcl_Obj *const objv[]); +static List * NewListIntRep(int objc, Tcl_Obj *const objv[], int p); static void DupListInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr); static void FreeListInternalRep(Tcl_Obj *listPtr); static int SetListFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr); @@ -45,22 +45,26 @@ const Tcl_ObjType tclListType = { UpdateStringOfList, /* updateStringProc */ SetListFromAny /* setFromAnyProc */ }; + +#ifndef TCL_MIN_ELEMENT_GROWTH +#define TCL_MIN_ELEMENT_GROWTH TCL_MIN_GROWTH/sizeof(Tcl_Obj *) +#endif /* *---------------------------------------------------------------------- * * NewListIntRep -- * - * If objc>0 and objv!=NULL, this function creates a list internal rep - * with objc elements given in the array objv. If objc>0 and objv==NULL - * it creates the list internal rep of a list with 0 elements, where - * enough space has been preallocated to store objc elements. If objc<=0, - * it returns NULL. + * Creates a list internal rep with space for objc elements. objc + * must be > 0. If objv!=NULL, initializes with the first objc values + * in that array. If objv==NULL, initalize list internal rep to have + * 0 elements, with space to add objc more. Flag value "p" indicates + * how to behave on failure. * * Results: - * A new List struct is returned. If objc<=0 or if the allocation fails - * for lack of memory, NULL is returned. The list returned has refCount - * 0. + * A new List struct with refCount 0 is returned. If some failure + * prevents this then if p=0, NULL is returned and otherwise the + * routine panics. * * Side effects: * The ref counts of the elements in objv are incremented since the @@ -72,12 +76,13 @@ const Tcl_ObjType tclListType = { static List * NewListIntRep( int objc, - Tcl_Obj *const objv[]) + Tcl_Obj *const objv[], + int p) { List *listRepPtr; if (objc <= 0) { - return NULL; + Tcl_Panic("NewListIntRep: expects postive element count"); } /* @@ -87,13 +92,20 @@ NewListIntRep( * requires API changes to fix. See [Bug 219196] for a discussion. */ - if ((size_t)objc > INT_MAX/sizeof(Tcl_Obj *)) { + if ((size_t)objc > LIST_MAX) { + if (p) { + Tcl_Panic("max length of a Tcl list (%d elements) exceeded", + LIST_MAX); + } return NULL; } - listRepPtr = (List *) - attemptckalloc(sizeof(List) + ((objc-1) * sizeof(Tcl_Obj *))); + listRepPtr = attemptckalloc(LIST_SIZE(objc)); if (listRepPtr == NULL) { + if (p) { + Tcl_Panic("list creation failed: unable to alloc %u bytes", + LIST_SIZE(objc)); + } return NULL; } @@ -120,6 +132,51 @@ NewListIntRep( /* *---------------------------------------------------------------------- * + * AttemptNewList -- + * + * Creates a list internal rep with space for objc elements. objc + * must be > 0. If objv!=NULL, initializes with the first objc values + * in that array. If objv==NULL, initalize list internal rep to have + * 0 elements, with space to add objc more. + * + * Results: + * A new List struct with refCount 0 is returned. If some failure + * prevents this then NULL is returned, and an error message is left + * in the interp result, unless interp is NULL. + * + * Side effects: + * The ref counts of the elements in objv are incremented since the + * resulting list now refers to them. + * + *---------------------------------------------------------------------- + */ + +static List * +AttemptNewList( + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + List *listRepPtr = NewListIntRep(objc, objv, 0); + + if (interp != NULL && listRepPtr == NULL) { + if (objc > LIST_MAX) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "max length of a Tcl list (%d elements) exceeded", + LIST_MAX)); + } else { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "list creation failed: unable to alloc %u bytes", + LIST_SIZE(objc))); + } + Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL); + } + return listRepPtr; +} + +/* + *---------------------------------------------------------------------- + * * Tcl_NewListObj -- * * This function is normally called when not debugging: i.e., when @@ -174,21 +231,14 @@ Tcl_NewListObj( * Create the internal rep. */ - listRepPtr = NewListIntRep(objc, objv); - if (!listRepPtr) { - Tcl_Panic("Not enough memory to allocate list"); - } + listRepPtr = NewListIntRep(objc, objv, 1); /* * Now create the object. */ Tcl_InvalidateStringRep(listPtr); - listPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; - listPtr->internalRep.twoPtrValue.ptr2 = NULL; - listPtr->typePtr = &tclListType; - listRepPtr->refCount++; - + ListSetIntRep(listPtr, listRepPtr); return listPtr; } #endif /* if TCL_MEM_DEBUG */ @@ -246,20 +296,14 @@ Tcl_DbNewListObj( * Create the internal rep. */ - listRepPtr = NewListIntRep(objc, objv); - if (!listRepPtr) { - Tcl_Panic("Not enough memory to allocate list"); - } + listRepPtr = NewListIntRep(objc, objv, 1); /* * Now create the object. */ Tcl_InvalidateStringRep(listPtr); - listPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; - listPtr->internalRep.twoPtrValue.ptr2 = NULL; - listPtr->typePtr = &tclListType; - listRepPtr->refCount++; + ListSetIntRep(listPtr, listRepPtr); return listPtr; } @@ -318,7 +362,6 @@ Tcl_SetListObj( */ TclFreeIntRep(objPtr); - objPtr->typePtr = NULL; Tcl_InvalidateStringRep(objPtr); /* @@ -328,14 +371,8 @@ Tcl_SetListObj( */ if (objc > 0) { - listRepPtr = NewListIntRep(objc, objv); - if (!listRepPtr) { - Tcl_Panic("Cannot allocate enough memory for Tcl_SetListObj"); - } - objPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; - objPtr->internalRep.twoPtrValue.ptr2 = NULL; - objPtr->typePtr = &tclListType; - listRepPtr->refCount++; + listRepPtr = NewListIntRep(objc, objv, 1); + ListSetIntRep(objPtr, listRepPtr); } else { objPtr->bytes = tclEmptyStringRep; objPtr->length = 0; @@ -426,30 +463,19 @@ Tcl_ListObjGetElements( register List *listRepPtr; if (listPtr->typePtr != &tclListType) { - int result, length; - - /* - * Don't get the string version of a dictionary; that transformation - * is not lossy, but is expensive. - */ + int result; - if (listPtr->typePtr == &tclDictType) { - (void) Tcl_DictObjSize(NULL, listPtr, &length); - } else { - (void) TclGetStringFromObj(listPtr, &length); - } - if (!length) { + if (listPtr->bytes == tclEmptyStringRep) { *objcPtr = 0; *objvPtr = NULL; return TCL_OK; } - result = SetListFromAny(interp, listPtr); if (result != TCL_OK) { return result; } } - listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + listRepPtr = ListRepPtr(listPtr); *objcPtr = listRepPtr->elemCount; *objvPtr = &listRepPtr->elements; return TCL_OK; @@ -460,16 +486,13 @@ Tcl_ListObjGetElements( * * Tcl_ListObjAppendList -- * - * This function appends the objects in the list referenced by - * elemListPtr to the list object referenced by listPtr. If listPtr is - * not already a list object, an attempt will be made to convert it to - * one. + * This function appends the elements in the list value referenced by + * elemListPtr to the list value referenced by listPtr. * * Results: * The return value is normally TCL_OK. If listPtr or elemListPtr do not - * refer to list objects and they can not be converted to one, TCL_ERROR - * is returned and an error message is left in the interpreter's result - * if interp is not NULL. + * refer to list values, TCL_ERROR is returned and an error message is + * left in the interpreter's result if interp is not NULL. * * Side effects: * The reference counts of the elements in elemListPtr are incremented @@ -487,29 +510,27 @@ Tcl_ListObjAppendList( register Tcl_Obj *listPtr, /* List object to append elements to. */ Tcl_Obj *elemListPtr) /* List obj with elements to append. */ { - int listLen, objc, result; + int objc; Tcl_Obj **objv; if (Tcl_IsShared(listPtr)) { Tcl_Panic("%s called with shared object", "Tcl_ListObjAppendList"); } - result = TclListObjLength(interp, listPtr, &listLen); - if (result != TCL_OK) { - return result; - } + /* + * Pull the elements to append from elemListPtr. + */ - result = TclListObjGetElements(interp, elemListPtr, &objc, &objv); - if (result != TCL_OK) { - return result; + if (TCL_OK != TclListObjGetElements(interp, elemListPtr, &objc, &objv)) { + return TCL_ERROR; } /* - * Insert objc new elements starting after the lists's last element. + * Insert the new elements starting after the lists's last element. * Delete zero existing elements. */ - return Tcl_ListObjReplace(interp, listPtr, listLen, 0, objc, objv); + return Tcl_ListObjReplace(interp, listPtr, LIST_MAX, 0, objc, objv); } /* @@ -545,77 +566,129 @@ Tcl_ListObjAppendElement( Tcl_Obj *listPtr, /* List object to append objPtr to. */ Tcl_Obj *objPtr) /* Object to append to listPtr's list. */ { - register List *listRepPtr; - register Tcl_Obj **elemPtrs; - int numElems, numRequired, newMax, newSize, i; + register List *listRepPtr, *newPtr = NULL; + int numElems, numRequired, needGrow, isShared, attempt; if (Tcl_IsShared(listPtr)) { Tcl_Panic("%s called with shared object", "Tcl_ListObjAppendElement"); } if (listPtr->typePtr != &tclListType) { - int result, length; + int result; - (void) TclGetStringFromObj(listPtr, &length); - if (!length) { + if (listPtr->bytes == tclEmptyStringRep) { Tcl_SetListObj(listPtr, 1, &objPtr); return TCL_OK; } - result = SetListFromAny(interp, listPtr); if (result != TCL_OK) { return result; } } - listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + listRepPtr = ListRepPtr(listPtr); numElems = listRepPtr->elemCount; numRequired = numElems + 1 ; + needGrow = (numRequired > listRepPtr->maxElemCount); + isShared = (listRepPtr->refCount > 1); - /* - * If there is no room in the current array of element pointers, allocate - * a new, larger array and copy the pointers to it. If the List struct is - * shared, allocate a new one. - */ + if (numRequired > LIST_MAX) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "max length of a Tcl list (%d elements) exceeded", + LIST_MAX)); + Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL); + } + return TCL_ERROR; + } - if (numRequired > listRepPtr->maxElemCount){ - newMax = 2 * numRequired; - newSize = sizeof(List) + ((newMax-1) * sizeof(Tcl_Obj *)); - } else { - newMax = listRepPtr->maxElemCount; - newSize = 0; + if (needGrow && !isShared) { + /* + * Need to grow + unshared intrep => try to realloc + */ + + attempt = 2 * numRequired; + if (attempt <= LIST_MAX) { + newPtr = attemptckrealloc(listRepPtr, LIST_SIZE(attempt)); + } + if (newPtr == NULL) { + attempt = numRequired + 1 + TCL_MIN_ELEMENT_GROWTH; + if (attempt > LIST_MAX) { + attempt = LIST_MAX; + } + newPtr = attemptckrealloc(listRepPtr, LIST_SIZE(attempt)); + } + if (newPtr == NULL) { + attempt = numRequired; + newPtr = attemptckrealloc(listRepPtr, LIST_SIZE(attempt)); + } + if (newPtr) { + listRepPtr = newPtr; + listRepPtr->maxElemCount = attempt; + needGrow = 0; + } } + if (isShared || needGrow) { + Tcl_Obj **dst, **src = &listRepPtr->elements; - if (listRepPtr->refCount > 1) { - List *oldListRepPtr = listRepPtr; - Tcl_Obj **oldElems; + /* + * Either we have a shared intrep and we must copy to write, or we + * need to grow and realloc attempts failed. Attempt intrep copy. + */ - listRepPtr = NewListIntRep(newMax, NULL); - if (!listRepPtr) { - Tcl_Panic("Not enough memory to allocate list"); + attempt = 2 * numRequired; + newPtr = AttemptNewList(NULL, attempt, NULL); + if (newPtr == NULL) { + attempt = numRequired + 1 + TCL_MIN_ELEMENT_GROWTH; + if (attempt > LIST_MAX) { + attempt = LIST_MAX; + } + newPtr = AttemptNewList(NULL, attempt, NULL); } - oldElems = &oldListRepPtr->elements; - elemPtrs = &listRepPtr->elements; - for (i=0; i<numElems; i++) { - elemPtrs[i] = oldElems[i]; - Tcl_IncrRefCount(elemPtrs[i]); + if (newPtr == NULL) { + attempt = numRequired; + newPtr = AttemptNewList(interp, attempt, NULL); } - listRepPtr->elemCount = numElems; - listRepPtr->refCount++; - oldListRepPtr->refCount--; - listPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; - } else if (newSize) { - listRepPtr = (List *) ckrealloc((char *)listRepPtr, (size_t)newSize); - listRepPtr->maxElemCount = newMax; - listPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; + if (newPtr == NULL) { + /* + * All growth attempts failed; throw the error. + */ + + return TCL_ERROR; + } + + dst = &newPtr->elements; + newPtr->refCount++; + newPtr->canonicalFlag = listRepPtr->canonicalFlag; + newPtr->elemCount = listRepPtr->elemCount; + + if (isShared) { + /* + * The original intrep must remain undisturbed. Copy into the new + * one and bump refcounts + */ + while (numElems--) { + *dst = *src++; + Tcl_IncrRefCount(*dst++); + } + listRepPtr->refCount--; + } else { + /* + * Old intrep to be freed, re-use refCounts. + */ + + memcpy(dst, src, (size_t) numElems * sizeof(Tcl_Obj *)); + ckfree(listRepPtr); + } + listRepPtr = newPtr; } + listPtr->internalRep.twoPtrValue.ptr1 = listRepPtr; /* * Add objPtr to the end of listPtr's array of element pointers. Increment * the ref count for the (now shared) objPtr. */ - elemPtrs = &listRepPtr->elements; - elemPtrs[numElems] = objPtr; + *(&listRepPtr->elements + listRepPtr->elemCount) = objPtr; Tcl_IncrRefCount(objPtr); listRepPtr->elemCount++; @@ -664,21 +737,19 @@ Tcl_ListObjIndex( register List *listRepPtr; if (listPtr->typePtr != &tclListType) { - int result, length; + int result; - (void) TclGetStringFromObj(listPtr, &length); - if (!length) { + if (listPtr->bytes == tclEmptyStringRep) { *objPtrPtr = NULL; return TCL_OK; } - result = SetListFromAny(interp, listPtr); if (result != TCL_OK) { return result; } } - listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + listRepPtr = ListRepPtr(listPtr); if ((index < 0) || (index >= listRepPtr->elemCount)) { *objPtrPtr = NULL; } else { @@ -719,21 +790,19 @@ Tcl_ListObjLength( register List *listRepPtr; if (listPtr->typePtr != &tclListType) { - int result, length; + int result; - (void) TclGetStringFromObj(listPtr, &length); - if (!length) { + if (listPtr->bytes == tclEmptyStringRep) { *intPtr = 0; return TCL_OK; } - result = SetListFromAny(interp, listPtr); if (result != TCL_OK) { return result; } } - listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + listRepPtr = ListRepPtr(listPtr); *intPtr = listRepPtr->elemCount; return TCL_OK; } @@ -794,15 +863,11 @@ Tcl_ListObjReplace( Tcl_Panic("%s called with shared object", "Tcl_ListObjReplace"); } if (listPtr->typePtr != &tclListType) { - int length; - - (void) TclGetStringFromObj(listPtr, &length); - if (!length) { - if (objc) { - Tcl_SetListObj(listPtr, objc, NULL); - } else { + if (listPtr->bytes == tclEmptyStringRep) { + if (!objc) { return TCL_OK; } + Tcl_SetListObj(listPtr, objc, NULL); } else { int result = SetListFromAny(interp, listPtr); @@ -820,7 +885,7 @@ Tcl_ListObjReplace( * Resist any temptation to optimize this case. */ - listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + listRepPtr = ListRepPtr(listPtr); elemPtrs = &listRepPtr->elements; numElems = listRepPtr->elemCount; @@ -835,8 +900,9 @@ Tcl_ListObjReplace( } else if (numElems < first+count || first+count < 0) { /* * The 'first+count < 0' condition here guards agains integer - * overflow in determining 'first+count' + * overflow in determining 'first+count'. */ + count = numElems - first; } @@ -886,12 +952,23 @@ Tcl_ListObjReplace( newMax = listRepPtr->maxElemCount; } - listRepPtr = NewListIntRep(newMax, NULL); - if (!listRepPtr) { - Tcl_Panic("Not enough memory to allocate list"); + listRepPtr = AttemptNewList(NULL, newMax, NULL); + if (listRepPtr == NULL) { + unsigned int limit = LIST_MAX - numRequired; + unsigned int extra = numRequired - numElems + + TCL_MIN_ELEMENT_GROWTH; + int growth = (int) ((extra > limit) ? limit : extra); + + listRepPtr = AttemptNewList(NULL, numRequired + growth, NULL); + if (listRepPtr == NULL) { + listRepPtr = AttemptNewList(interp, numRequired, NULL); + if (listRepPtr == NULL) { + return TCL_ERROR; + } + } } - listPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; + listPtr->internalRep.twoPtrValue.ptr1 = listRepPtr; listRepPtr->refCount++; elemPtrs = &listRepPtr->elements; @@ -945,7 +1022,7 @@ Tcl_ListObjReplace( (size_t) numAfterLast * sizeof(Tcl_Obj *)); } - ckfree((char *) oldListRepPtr); + ckfree(oldListRepPtr); } } @@ -1008,8 +1085,6 @@ TclLindexList( { int index; /* Index into the list. */ - Tcl_Obj **indices; /* Array of list indices. */ - int indexCount; /* Size of the array of list indices. */ Tcl_Obj *indexListCopy; /* @@ -1049,8 +1124,19 @@ TclLindexList( return TclLindexFlat(interp, listPtr, 1, &argPtr); } - TclListObjGetElements(NULL, indexListCopy, &indexCount, &indices); - listPtr = TclLindexFlat(interp, listPtr, indexCount, indices); + if (indexListCopy->typePtr == &tclListType) { + List *listRepPtr = ListRepPtr(indexListCopy); + + listPtr = TclLindexFlat(interp, listPtr, listRepPtr->elemCount, + &listRepPtr->elements); + } else { + int indexCount = -1; /* Size of the array of list indices. */ + Tcl_Obj **indices = NULL; + /* Array of list indices. */ + + Tcl_ListObjGetElements(NULL, indexListCopy, &indexCount, &indices); + listPtr = TclLindexFlat(interp, listPtr, indexCount, indices); + } Tcl_DecrRefCount(indexListCopy); return listPtr; } @@ -1232,8 +1318,8 @@ TclLsetList( * * Results: * Returns the new value of the list variable, or NULL if an error - * occurred. The returned object includes one reference count for - * the pointer returned. + * occurred. The returned object includes one reference count for the + * pointer returned. * * Side effects: * On entry, the reference count of the variable value does not reflect @@ -1279,8 +1365,8 @@ TclLsetFlat( Tcl_Obj *subListPtr, *retValuePtr, *chainPtr; /* - * If there are no indices, simply return the new value. - * (Without indices, [lset] is a synonym for [set]. + * If there are no indices, simply return the new value. (Without + * indices, [lset] is a synonym for [set]. */ if (indexCount == 0) { @@ -1289,14 +1375,14 @@ TclLsetFlat( } /* - * If the list is shared, make a copy we can modify (copy-on-write). - * We use Tcl_DuplicateObj() instead of TclListObjCopy() for a few - * reasons: 1) we have not yet confirmed listPtr is actually a list; - * 2) We make a verbatim copy of any existing string rep, and when - * we combine that with the delayed invalidation of string reps of - * modified Tcl_Obj's implemented below, the outcome is that any - * error condition that causes this routine to return NULL, will - * leave the string rep of listPtr and all elements to be unchanged. + * If the list is shared, make a copy we can modify (copy-on-write). We + * use Tcl_DuplicateObj() instead of TclListObjCopy() for a few reasons: + * 1) we have not yet confirmed listPtr is actually a list; 2) We make a + * verbatim copy of any existing string rep, and when we combine that with + * the delayed invalidation of string reps of modified Tcl_Obj's + * implemented below, the outcome is that any error condition that causes + * this routine to return NULL, will leave the string rep of listPtr and + * all elements to be unchanged. */ subListPtr = Tcl_IsShared(listPtr) ? Tcl_DuplicateObj(listPtr) : listPtr; @@ -1308,21 +1394,25 @@ TclLsetFlat( retValuePtr = subListPtr; chainPtr = NULL; + result = TCL_OK; /* - * Loop through all the index arguments, and for each one dive - * into the appropriate sublist. + * Loop through all the index arguments, and for each one dive into the + * appropriate sublist. */ do { int elemCount; Tcl_Obj *parentList, **elemPtrs; - /* Check for the possible error conditions... */ - result = TCL_ERROR; + /* + * Check for the possible error conditions... + */ + if (TclListObjGetElements(interp, subListPtr, &elemCount, &elemPtrs) != TCL_OK) { /* ...the sublist we're indexing into isn't a list at all. */ + result = TCL_ERROR; break; } @@ -1334,6 +1424,7 @@ TclLsetFlat( if (TclGetIntForIndexM(interp, *indexArray, elemCount - 1, &index) != TCL_OK) { /* ...the index we're trying to use isn't an index at all. */ + result = TCL_ERROR; indexArray++; break; } @@ -1341,19 +1432,23 @@ TclLsetFlat( if (index < 0 || index > elemCount) { /* ...the index points outside the sublist. */ - Tcl_SetObjResult(interp, - Tcl_NewStringObj("list index out of range", -1)); + if (interp != NULL) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj("list index out of range", -1)); + Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSET", + "BADINDEX", NULL); + } + result = TCL_ERROR; break; } /* - * No error conditions. As long as we're not yet on the last - * index, determine the next sublist for the next pass through - * the loop, and take steps to make sure it is an unshared copy, - * as we intend to modify it. + * No error conditions. As long as we're not yet on the last index, + * determine the next sublist for the next pass through the loop, and + * take steps to make sure it is an unshared copy, as we intend to + * modify it. */ - result = TCL_OK; if (--indexCount) { parentList = subListPtr; if (index == elemCount) { @@ -1370,8 +1465,8 @@ TclLsetFlat( * we know to be unshared. This call will also deal with the * situation where parentList shares its intrep with other * Tcl_Obj's. Dealing with the shared intrep case can cause - * subListPtr to become shared again, so detect that case and - * make and store another copy. + * subListPtr to become shared again, so detect that case and make + * and store another copy. */ if (index == elemCount) { @@ -1385,62 +1480,71 @@ TclLsetFlat( } /* - * The TclListObjSetElement() calls do not spoil the string - * rep of parentList, and that's fine for now, since all we've - * done so far is replace a list element with an unshared copy. - * The list value remains the same, so the string rep. is still - * valid, and unchanged, which is good because if this whole - * routine returns NULL, we'd like to leave no change to the - * value of the lset variable. Later on, when we set valuePtr - * in its proper place, then all containing lists will have - * their values changed, and will need their string reps spoiled. - * We maintain a list of all those Tcl_Obj's (via a little intrep - * surgery) so we can spoil them at that time. + * The TclListObjSetElement() calls do not spoil the string rep of + * parentList, and that's fine for now, since all we've done so + * far is replace a list element with an unshared copy. The list + * value remains the same, so the string rep. is still valid, and + * unchanged, which is good because if this whole routine returns + * NULL, we'd like to leave no change to the value of the lset + * variable. Later on, when we set valuePtr in its proper place, + * then all containing lists will have their values changed, and + * will need their string reps spoiled. We maintain a list of all + * those Tcl_Obj's (via a little intrep surgery) so we can spoil + * them at that time. */ - parentList->internalRep.twoPtrValue.ptr2 = (void *) chainPtr; + parentList->internalRep.twoPtrValue.ptr2 = chainPtr; chainPtr = parentList; } } while (indexCount > 0); /* - * Either we've detected and error condition, and exited the loop - * with result == TCL_ERROR, or we've successfully reached the last - * index, and we're ready to store valuePtr. In either case, we - * need to clean up our string spoiling list of Tcl_Obj's. + * Either we've detected and error condition, and exited the loop with + * result == TCL_ERROR, or we've successfully reached the last index, and + * we're ready to store valuePtr. In either case, we need to clean up our + * string spoiling list of Tcl_Obj's. */ while (chainPtr) { Tcl_Obj *objPtr = chainPtr; if (result == TCL_OK) { - /* - * We're going to store valuePtr, so spoil string reps - * of all containing lists. + * We're going to store valuePtr, so spoil string reps of all + * containing lists. */ Tcl_InvalidateStringRep(objPtr); } - /* Clear away our intrep surgery mess */ - chainPtr = (Tcl_Obj *) objPtr->internalRep.twoPtrValue.ptr2; + /* + * Clear away our intrep surgery mess. + */ + + chainPtr = objPtr->internalRep.twoPtrValue.ptr2; objPtr->internalRep.twoPtrValue.ptr2 = NULL; } if (result != TCL_OK) { /* - * Error return; message is already in interp. Clean up - * any excess memory. + * Error return; message is already in interp. Clean up any excess + * memory. */ + if (retValuePtr != listPtr) { Tcl_DecrRefCount(retValuePtr); } return NULL; } - /* Store valuePtr in proper sublist and return */ - Tcl_ListObjLength(NULL, subListPtr, &len); + /* + * Store valuePtr in proper sublist and return. The -1 is to avoid a + * compiler warning (not a problem because we checked that we have a + * proper list - or something convertible to one - above). + */ + + len = -1; + TclListObjLength(NULL, subListPtr, &len); if (index == len) { Tcl_ListObjAppendElement(NULL, subListPtr, valuePtr); } else { @@ -1503,12 +1607,15 @@ TclListObjSetElement( Tcl_Panic("%s called with shared object", "TclListObjSetElement"); } if (listPtr->typePtr != &tclListType) { - int length, result; + int result; - (void) TclGetStringFromObj(listPtr, &length); - if (!length) { - Tcl_SetObjResult(interp, - Tcl_NewStringObj("list index out of range", -1)); + if (listPtr->bytes == tclEmptyStringRep) { + if (interp != NULL) { + Tcl_SetObjResult(interp, + Tcl_NewStringObj("list index out of range", -1)); + Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSET", + "BADINDEX", NULL); + } return TCL_ERROR; } result = SetListFromAny(interp, listPtr); @@ -1517,9 +1624,8 @@ TclListObjSetElement( } } - listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + listRepPtr = ListRepPtr(listPtr); elemCount = listRepPtr->elemCount; - elemPtrs = &listRepPtr->elements; /* * Ensure that the index is in bounds. @@ -1529,6 +1635,8 @@ TclListObjSetElement( if (interp != NULL) { Tcl_SetObjResult(interp, Tcl_NewStringObj("list index out of range", -1)); + Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSET", "BADINDEX", + NULL); } return TCL_ERROR; } @@ -1538,25 +1646,30 @@ TclListObjSetElement( */ if (listRepPtr->refCount > 1) { - List *oldListRepPtr = listRepPtr; - Tcl_Obj **oldElemPtrs = elemPtrs; - int i; + Tcl_Obj **dst, **src = &listRepPtr->elements; + List *newPtr = AttemptNewList(NULL, listRepPtr->maxElemCount, NULL); - listRepPtr = NewListIntRep(listRepPtr->maxElemCount, NULL); - if (listRepPtr == NULL) { - Tcl_Panic("Not enough memory to allocate list"); + if (newPtr == NULL) { + newPtr = AttemptNewList(interp, elemCount, NULL); + if (newPtr == NULL) { + return TCL_ERROR; + } } - listRepPtr->canonicalFlag = oldListRepPtr->canonicalFlag; - elemPtrs = &listRepPtr->elements; - for (i=0; i < elemCount; i++) { - elemPtrs[i] = oldElemPtrs[i]; - Tcl_IncrRefCount(elemPtrs[i]); + newPtr->refCount++; + newPtr->elemCount = elemCount; + newPtr->canonicalFlag = listRepPtr->canonicalFlag; + + dst = &newPtr->elements; + while (elemCount--) { + *dst = *src++; + Tcl_IncrRefCount(*dst++); } - listRepPtr->refCount++; - listRepPtr->elemCount = elemCount; - listPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; - oldListRepPtr->refCount--; + + listRepPtr->refCount--; + + listPtr->internalRep.twoPtrValue.ptr1 = listRepPtr = newPtr; } + elemPtrs = &listRepPtr->elements; /* * Add a reference to the new list element. @@ -1602,18 +1715,16 @@ static void FreeListInternalRep( Tcl_Obj *listPtr) /* List object with internal rep to free. */ { - register List *listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; - register Tcl_Obj **elemPtrs = &listRepPtr->elements; - register Tcl_Obj *objPtr; - int numElems = listRepPtr->elemCount; - int i; + List *listRepPtr = ListRepPtr(listPtr); if (--listRepPtr->refCount <= 0) { + Tcl_Obj **elemPtrs = &listRepPtr->elements; + int i, numElems = listRepPtr->elemCount; + for (i = 0; i < numElems; i++) { - objPtr = elemPtrs[i]; - Tcl_DecrRefCount(objPtr); + Tcl_DecrRefCount(elemPtrs[i]); } - ckfree((char *) listRepPtr); + ckfree(listRepPtr); } listPtr->internalRep.twoPtrValue.ptr1 = NULL; @@ -1643,12 +1754,9 @@ DupListInternalRep( Tcl_Obj *srcPtr, /* Object with internal rep to copy. */ Tcl_Obj *copyPtr) /* Object with internal rep to set. */ { - List *listRepPtr = (List *) srcPtr->internalRep.twoPtrValue.ptr1; + List *listRepPtr = ListRepPtr(srcPtr); - listRepPtr->refCount++; - copyPtr->internalRep.twoPtrValue.ptr1 = (void *) listRepPtr; - copyPtr->internalRep.twoPtrValue.ptr2 = NULL; - copyPtr->typePtr = &tclListType; + ListSetIntRep(copyPtr, listRepPtr); } /* @@ -1675,15 +1783,8 @@ SetListFromAny( Tcl_Interp *interp, /* Used for error reporting if not NULL. */ Tcl_Obj *objPtr) /* The object to convert. */ { - const char *string; - char *s; - const char *elemStart, *nextElem; - int lenRemain, length, estCount, elemSize, hasBrace, i, j, result; - const char *limit; /* Points just after string's last byte. */ - register const char *p; - register Tcl_Obj **elemPtrs; - register Tcl_Obj *elemPtr; List *listRepPtr; + Tcl_Obj **elemPtrs; /* * Dictionaries are a special case; they have a string representation such @@ -1708,12 +1809,8 @@ SetListFromAny( */ Tcl_DictObjSize(NULL, objPtr, &size); - listRepPtr = NewListIntRep(size > 0 ? 2*size : 1, NULL); + listRepPtr = AttemptNewList(interp, size > 0 ? 2*size : 1, NULL); if (!listRepPtr) { - Tcl_SetResult(interp, - "insufficient memory to allocate list working space", - TCL_STATIC); - Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL); return TCL_ERROR; } listRepPtr->elemCount = 2 * size; @@ -1724,117 +1821,75 @@ SetListFromAny( elemPtrs = &listRepPtr->elements; Tcl_DictObjFirst(NULL, objPtr, &search, &keyPtr, &valuePtr, &done); - i = 0; while (!done) { - elemPtrs[i++] = keyPtr; - elemPtrs[i++] = valuePtr; + *elemPtrs++ = keyPtr; + *elemPtrs++ = valuePtr; Tcl_IncrRefCount(keyPtr); Tcl_IncrRefCount(valuePtr); Tcl_DictObjNext(&search, &keyPtr, &valuePtr, &done); } + } else { + int estCount, length; + const char *limit, *nextElem = TclGetStringFromObj(objPtr, &length); /* - * Swap the representations. + * Allocate enough space to hold a (Tcl_Obj *) for each + * (possible) list element. */ - goto commitRepresentation; - } - - /* - * Get the string representation. Make it up-to-date if necessary. - */ - - string = TclGetStringFromObj(objPtr, &length); - - /* - * Parse the string into separate string objects, and create a List - * structure that points to the element string objects. We use a modified - * version of Tcl_SplitList's implementation to avoid one malloc and a - * string copy for each list element. First, estimate the number of - * elements by counting the number of space characters in the list. - */ - - limit = string + length; - estCount = 1; - for (p = string; p < limit; p++) { - if (isspace(UCHAR(*p))) { /* INTL: ISO space. */ - estCount++; + estCount = TclMaxListLength(nextElem, length, &limit); + estCount += (estCount == 0); /* Smallest list struct holds 1 + * element. */ + listRepPtr = AttemptNewList(interp, estCount, NULL); + if (listRepPtr == NULL) { + return TCL_ERROR; } - } + elemPtrs = &listRepPtr->elements; - /* - * Allocate a new List structure with enough room for "estCount" elements. - * Each element is a pointer to a Tcl_Obj with the appropriate string rep. - * The initial "estCount" elements are set using the corresponding "argv" - * strings. - */ + /* + * Each iteration, parse and store a list element. + */ - listRepPtr = NewListIntRep(estCount, NULL); - if (!listRepPtr) { - Tcl_SetObjResult(interp, Tcl_NewStringObj( - "Not enough memory to allocate the list internal rep", -1)); - Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL); - return TCL_ERROR; - } - elemPtrs = &listRepPtr->elements; + while (nextElem < limit) { + const char *elemStart; + int elemSize, literal; - for (p=string, lenRemain=length, i=0; - lenRemain > 0; - p=nextElem, lenRemain=limit-nextElem, i++) { - result = TclFindElement(interp, p, lenRemain, &elemStart, &nextElem, - &elemSize, &hasBrace); - if (result != TCL_OK) { - for (j = 0; j < i; j++) { - elemPtr = elemPtrs[j]; - Tcl_DecrRefCount(elemPtr); + if (TCL_OK != TclFindElement(interp, nextElem, limit - nextElem, + &elemStart, &nextElem, &elemSize, &literal)) { + while (--elemPtrs >= &listRepPtr->elements) { + Tcl_DecrRefCount(*elemPtrs); + } + ckfree((char *) listRepPtr); + return TCL_ERROR; } - ckfree((char *) listRepPtr); - if (interp != NULL) { - Tcl_SetErrorCode(interp, "TCL", "VALUE", "LIST", NULL); + if (elemStart == limit) { + break; } - return result; - } - if (elemStart >= limit) { - break; - } - if (i > estCount) { - Tcl_Panic("SetListFromAny: bad size estimate for list"); - } - /* - * Allocate a Tcl object for the element and initialize it from the - * "elemSize" bytes starting at "elemStart". - */ + /* TODO: replace panic with error on alloc failure? */ + if (literal) { + TclNewStringObj(*elemPtrs, elemStart, elemSize); + } else { + TclNewObj(*elemPtrs); + (*elemPtrs)->bytes = ckalloc((unsigned) elemSize + 1); + (*elemPtrs)->length = TclCopyAndCollapse(elemSize, elemStart, + (*elemPtrs)->bytes); + } - s = ckalloc((unsigned) elemSize + 1); - if (hasBrace) { - memcpy(s, elemStart, (size_t) elemSize); - s[elemSize] = 0; - } else { - elemSize = TclCopyAndCollapse(elemSize, elemStart, s); + Tcl_IncrRefCount(*elemPtrs++);/* Since list now holds ref to it. */ } - TclNewObj(elemPtr); - elemPtr->bytes = s; - elemPtr->length = elemSize; - elemPtrs[i] = elemPtr; - Tcl_IncrRefCount(elemPtr); /* Since list now holds ref to it. */ + listRepPtr->elemCount = elemPtrs - &listRepPtr->elements; } - listRepPtr->elemCount = i; - /* * Free the old internalRep before setting the new one. We do this as late * as possible to allow the conversion code, in particular * Tcl_GetStringFromObj, to use that old internalRep. */ - commitRepresentation: - listRepPtr->refCount++; TclFreeIntRep(objPtr); - objPtr->internalRep.twoPtrValue.ptr1 = listRepPtr; - objPtr->internalRep.twoPtrValue.ptr2 = NULL; - objPtr->typePtr = &tclListType; + ListSetIntRep(objPtr, listRepPtr); return TCL_OK; } @@ -1864,20 +1919,32 @@ UpdateStringOfList( Tcl_Obj *listPtr) /* List object with string rep to update. */ { # define LOCAL_SIZE 20 - int localFlags[LOCAL_SIZE], *flagPtr; - List *listRepPtr = (List *) listPtr->internalRep.twoPtrValue.ptr1; + int localFlags[LOCAL_SIZE], *flagPtr = NULL; + List *listRepPtr = ListRepPtr(listPtr); int numElems = listRepPtr->elemCount; - register int i; + int i, length, bytesNeeded = 0; const char *elem; char *dst; - int length; Tcl_Obj **elemPtrs; /* - * Convert each element of the list to string form and then convert it to - * proper list element form, adding it to the result buffer. + * Mark the list as being canonical; although it will now have a string + * rep, it is one we derived through proper "canonical" quoting and so + * it's known to be free from nasties relating to [concat] and [eval]. */ + listRepPtr->canonicalFlag = 1; + + /* + * Handle empty list case first, so rest of the routine is simpler. + */ + + if (numElems == 0) { + listPtr->bytes = tclEmptyStringRep; + listPtr->length = 0; + return; + } + /* * Pass 1: estimate space, gather flags. */ @@ -1885,54 +1952,44 @@ UpdateStringOfList( if (numElems <= LOCAL_SIZE) { flagPtr = localFlags; } else { - flagPtr = (int *) ckalloc((unsigned) numElems * sizeof(int)); + /* + * We know numElems <= LIST_MAX, so this is safe. + */ + + flagPtr = ckalloc(numElems * sizeof(int)); } - listPtr->length = 1; elemPtrs = &listRepPtr->elements; for (i = 0; i < numElems; i++) { + flagPtr[i] = (i ? TCL_DONT_QUOTE_HASH : 0); elem = TclGetStringFromObj(elemPtrs[i], &length); - listPtr->length += Tcl_ScanCountedElement(elem, length, flagPtr+i)+1; - - /* - * Check for continued sanity. [Bug 1267380] - */ - - if (listPtr->length < 1) { - Tcl_Panic("string representation size exceeds sane bounds"); + bytesNeeded += TclScanElement(elem, length, flagPtr+i); + if (bytesNeeded < 0) { + Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX); } } + if (bytesNeeded > INT_MAX - numElems + 1) { + Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX); + } + bytesNeeded += numElems; /* * Pass 2: copy into string rep buffer. */ - listPtr->bytes = ckalloc((unsigned) listPtr->length); + listPtr->length = bytesNeeded - 1; + listPtr->bytes = ckalloc(bytesNeeded); dst = listPtr->bytes; for (i = 0; i < numElems; i++) { + flagPtr[i] |= (i ? TCL_DONT_QUOTE_HASH : 0); elem = TclGetStringFromObj(elemPtrs[i], &length); - dst += Tcl_ConvertCountedElement(elem, length, dst, - flagPtr[i] | (i==0 ? 0 : TCL_DONT_QUOTE_HASH)); - *dst = ' '; - dst++; + dst += TclConvertElement(elem, length, dst, flagPtr[i]); + *dst++ = ' '; } + listPtr->bytes[listPtr->length] = '\0'; + if (flagPtr != localFlags) { - ckfree((char *) flagPtr); + ckfree(flagPtr); } - if (dst == listPtr->bytes) { - *dst = 0; - } else { - dst--; - *dst = 0; - } - listPtr->length = dst - listPtr->bytes; - - /* - * Mark the list as being canonical; although it has a string rep, it is - * one we derived through proper "canonical" quoting and so it's known to - * be free from nasties relating to [concat] and [eval]. - */ - - listRepPtr->canonicalFlag = 1; } /* |