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Reviewed-by: Trust Me
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This commit introduces a new internal JS object type,
QScriptStaticScopeObject, that enables the JS compiler to make
more aggressive optimizations of scoped property access.
QScriptStaticScopeObject registers all its properties in a
symbol table that the JS compiler has access to. If the compiler
finds the property in the symbol table, it will generate the
fast index-based op_{get,put}_scoped_var bytecodes, rather than
the dynamic (slow) op_resolve and friends.
If the compiler _doesn't_ find the property in the symbol table,
it infers that it's safe to skip the scope object when later
resolving the property, which will also improve performance
(see op_resolve_skip bytecode).
QScriptStaticScopeObject is only safe to use when all relevant
properties are known at JS compile time; that is, when a
function that has the static scope object in its scope chain is
compiled.
It's up to the user of the class (e.g. QtDeclarative) to ensure
that this constraint is not violated.
The API for constructing QScriptStaticScopeObject instances is
not public; it lives in QScriptDeclarativeClass for now, an
internal class exported for the purpose of QML. The instance is
returned as a QScriptValue and can be manipulated like any
other JS object (e.g. by QScriptValue::setProperty()).
The other part of this commit utilizes QScriptStaticScopeObject
in QtDeclarative in the two major places where it's currently
possible:
1) QML disallows adding properties to the Global Object.
Furthermore, it's not possible for QML IDs and properties to
"shadow" global variables. Hence, a QScriptStaticScopeObject
can be used to hold all the standard ECMA properties, and this
scope object can come _before_ the QML component in the scope
chain. This enables binding expressions and scripts to have
optimized (direct) access to e.g. Math.sin.
2) Imported scripts can have their properties (resulting from
variable declarations ("var" statements) and function
declarations) added to a static scope object. This enables
functions in the script to have optimized (direct) access to
the script's own properties, as well as to global properties
such as Math.
With this change, it's no longer possible to delete properties
of the Global Object, nor delete properties of an imported
script. It's a compromise we make in order to make the
optimization safe.
Task-number: QTBUG-8576
Reviewed-by: Aaron Kennedy
Reviewed-by: Olivier Goffart
Reviewed-by: Jedrzej Nowacki
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Conflicts:
src/3rdparty/webkit/VERSION
src/3rdparty/webkit/WebCore/ChangeLog
src/3rdparty/webkit/WebCore/page/FrameView.cpp
src/3rdparty/webkit/WebCore/rendering/RenderWidget.cpp
src/3rdparty/webkit/WebKit/qt/symbian/eabi/QtWebKitu.def
src/s60installs/bwins/QtCoreu.def
src/s60installs/bwins/QtGuiu.def
src/s60installs/bwins/QtNetworku.def
src/s60installs/eabi/QtGuiu.def
tests/auto/qscriptextqobject/tst_qscriptextqobject.cpp
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That's a more realistic case, since translations are usually
tied to a physical script.
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4.7-integration
* '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1: (72 commits)
different approach to fixing "the other" aliasing issue
fix aliasing issue in node_construct()
detach in fewer cases, remove redundant calculation
SSL: Fix memleak related to local certificate
Improve keyboard layout detection on X11
Compile on ARM with -Werror -Wold-style-cast
Use the vista-style native dialog for QFileDialog::getExistingDirectory
Apply the stdset attribute for resource properties
doc: Completed sentence about HideNameFilterDetails
Doc fix in QLocale
Doc for for QGestureRecognizer::create.
Fix broken setCollectionFile (creating multiple models instead reusing)
Enable the fast paths when converting to Rgb565
qdoc: ifdefed out all the debug code.
Add missing QtScript API shims
Further fix license whitespace.
Remove NetworkManager test-bed application.
Remove configure test for NetworkManager.
Fix QDir::entryList regression
Add DEFINES to mingw32/windres.exe command line.
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Reviewed-by: Benjamin Poulain
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Many of the benchmarks generate executables with same names as
the autotests. This is a big problem for Symbian, where all binaries
are stored into single directory. Renamed benchmark targets to include
'bench' in their name to ensure no overlap in target names.
Part of QtP delta reduction effort.
Reviewed-by: Liang Qi
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Reviewed-by: Benjamin Poulain
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4.6-integration
* '4.6' of scm.dev.nokia.troll.no:qt/oslo-staging-2:
Fixed some global QIcon/QPixmap instances that leaked handles on X11.
Speed up QListView test
QListView: fix crash when hiding many of the lasts item in a QListView
Fixed warnings and crash when painting graphics effects outside scene.
Stabilize QLineEdit test on X11
(sqlite) Allow shared cache mode
Make generate uid3 (symbian) work on 64 bit host platform.
Updated the docs for QPainter::begin/endNativePainting()
Compile fix for network benchmarks.
Add a pixmap modification hook to blur pixmap filter cache
Delete benchmark examples (qtestlib-simple and qtwidgets).
Restructure tests/benchmarks directory.
Fixed QImagReader::setAutoDetectImageFormat() to work with plugins.
QLineEdit: regression: read-only line edits would eat shortcuts.
QGraphicsItem: Do not crash at exit if there is static QGraphicsItem.
Make QTextCodec reentrant.
Fixed bug where GL widget was not fully updated on Vista.
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We follow the same structure as used in the src directory. This makes it
easier to navigate through the jungel, especially now that we are going
to add functional tests etc.
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