From a41c61fb2d2f973fd1cd5e95ee5be1ac1a4f8433 Mon Sep 17 00:00:00 2001 From: Alex Trotsenko Date: Tue, 11 Aug 2020 19:30:15 +0300 Subject: QIODevice: implement a "zero-copy" strategy for buffered writes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit It works as follows: - user calls write(const QByteArray &); - this function keeps a pointer to the chunk and calls a regular write(data, len); - write(data, len) calls a virtual writeData(); - subclass calls a new QIODevicePrivate::write(); - QIODevicePrivate::write() makes a shallow copy of the byte array. Proposed solution is fully compatible with existing subclasses. By replacing a call to d->writeBuffer.append() with d->write(), subclasses can improve their performance. Bump the TypeInformationVersion field in qtHookData, to notify the Qt Creator developers that the offset of QFilePrivate::fileName was changed and dumpers should be adapted. Change-Id: I24713386cc74a9f37e5223c617e4b1ba97f968dc Reviewed-by: Oswald Buddenhagen Reviewed-by: Mårten Nordheim --- tests/auto/other/toolsupport/tst_toolsupport.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'tests/auto/other/toolsupport') diff --git a/tests/auto/other/toolsupport/tst_toolsupport.cpp b/tests/auto/other/toolsupport/tst_toolsupport.cpp index 19b6adb4b3..fc3a13267e 100644 --- a/tests/auto/other/toolsupport/tst_toolsupport.cpp +++ b/tests/auto/other/toolsupport/tst_toolsupport.cpp @@ -126,9 +126,9 @@ void tst_toolsupport::offsets_data() #ifdef Q_PROCESSOR_X86 // x86 32-bit has weird alignment rules. Refer to QtPrivate::AlignOf in // qglobal.h for more details. - data << 184 << 288; + data << 188 << 296; #else - data << 188 << 288; + data << 192 << 296; #endif } #endif -- cgit v1.2.3