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Revert "get rid of QString::shared_empty member"

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This reverts commit 93d76d14e7.
This commit is contained in:
Ivailo Monev 2021-03-25 23:42:51 +02:00
parent 93d76d14e7
commit bbff940f49
2 changed files with 22 additions and 10 deletions
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31
src/core/tools/qstring.cpp
View file

@ -576,6 +576,8 @@ static int findChar(const QChar *str, int len, QChar ch, int from,
QString::Data QString::shared_null = { QAtomicInt(1),
0, 0, 0, shared_null.array, {0} };
QString::Data QString::shared_empty = { QAtomicInt(1),
0, 0, 0, shared_empty.array, {0} };
int QString::grow(int size)
{
@ -821,9 +823,12 @@ int QString::toWCharArray(wchar_t *array) const
*/
QString::QString(const QChar *unicode, int size)
{
if (!unicode || size <= 0) {
if (!unicode) {
d = &shared_null;
d->ref.ref();
} else if (size <= 0) {
d = &shared_empty;
d->ref.ref();
} else {
d = static_cast<Data*>(::malloc(sizeof(Data)+size*sizeof(QChar)));
Q_CHECK_PTR(d);
@ -845,7 +850,7 @@ QString::QString(const QChar *unicode, int size)
QString::QString(const int size, const QChar ch)
{
if (size <= 0) {
d = &shared_null;
d = &shared_empty;
d->ref.ref();
} else {
d = static_cast<Data*>(::malloc(sizeof(Data)+size*sizeof(QChar)));
@ -956,8 +961,8 @@ QString::QString(const QChar ch)
void QString::freeData(Data *d)
{
if(d != &shared_null)
::free(d);
if(d != &shared_null && d != &shared_empty)
free(d);
}
/*!
@ -996,7 +1001,7 @@ void QString::resize(int size)
size = 0;
if (size == 0 && !d->capacity) {
Data *x = &shared_null;
Data *x = &shared_empty;
x->ref.ref();
if (!d->ref.deref())
QString::freeData(d);
@ -1287,7 +1292,7 @@ QString& QString::insert(int i, QChar ch)
*/
QString &QString::append(const QString &str)
{
if (str.d != &shared_null) {
if (str.d != &shared_null && str.d != &shared_empty) {
if (d->ref != 1 || d->size + str.d->size > d->alloc)
reallocData(grow(d->size + str.d->size));
memcpy(d->data + d->size, str.d->data, str.d->size * sizeof(QChar));
@ -3126,7 +3131,7 @@ QString QString::right(int n) const
QString QString::mid(int position, int n) const
{
if (d == &shared_null || position >= d->size)
if (d == &shared_null || d == &shared_empty || position >= d->size)
return QString();
if (n < 0)
n = d->size - position;
@ -3403,9 +3408,12 @@ QVector<uint> QString::toUcs4() const
QString::Data *QString::fromLatin1_helper(const char *str, int size)
{
Data *d;
if (!str || size == 0 || (!*str && size < 0)) {
if (!str) {
d = &shared_null;
d->ref.ref();
} else if (size == 0 || (!*str && size < 0)) {
d = &shared_empty;
d->ref.ref();
} else {
if (size < 0)
size = qstrlen(str);
@ -3428,9 +3436,12 @@ QString::Data *QString::fromAscii_helper(const char *str, int size)
#ifndef QT_NO_TEXTCODEC
if (codecForCStrings) {
Data *d;
if (!str || size == 0 || (!*str && size < 0)) {
if (!str) {
d = &shared_null;
d->ref.ref();
} else if (size == 0 || (!*str && size < 0)) {
d = &shared_empty;
d->ref.ref();
} else {
if (size < 0)
size = qstrlen(str);
@ -7692,7 +7703,7 @@ QStringRef QString::rightRef(int n) const
QStringRef QString::midRef(int position, int n) const
{
if (d == &shared_null || position >= d->size)
if (d == &shared_null || d == &shared_empty || position >= d->size)
return QStringRef();
if (n < 0)
n = d->size - position;

1
src/core/tools/qstring.h
View file

@ -477,6 +477,7 @@ private:
ushort array[1];
};
static Data shared_null;
static Data shared_empty;
Data *d;
QString(Data *dd, int /*dummy*/) : d(dd) {}
#ifndef QT_NO_TEXTCODEC