We don't have access to an appropriate context to create the dead wrapper in
when the callback is nuked, so instead, this patch creates a new dead wrapper
in the caller compartment each time the property is accessed. This is the same
behavior we'd get when trying to re-wrap a cross-compartment dead wrapper, so
it's consistent with the way we handle these situations elsewhere.
MozReview-Commit-ID: 3cMeR4z8EOe
--HG--
extra : rebase_source : 7e8cf4a195ef64deb7677ce4ac9818d342815667
Rooted used to only work when the JSContext was in a request. This has long
been rectified, so the comments referring to that constraint are confusing at
best.
Using a simple |const char*| is more memory-efficient than allocating a
JS string. We still have to allocate the JS string for passing things
into JS, but ideally we will be able to move the point of allocation
much closer to where it's actually needed, rather than indiscriminantly
doing it all the time.
Using a simple |const char*| is more memory-efficient than allocating a
JS string. We still have to allocate the JS string for passing things
into JS, but ideally we will be able to move the point of allocation
much closer to where it's actually needed, rather than indiscriminantly
doing it all the time.
In general, using an AutoJSAPI inited with an object is NOT the same as using
AutoSafeJSContext (or AutoJSAPI inited without an object) and then entering the
compartment of the object: the former will report exceptions to the global of
the object as it comes off the stack, while the latter will not. This only
really matters if we have an object from a window or worker global and hence
might fire error events, or report internal stuff to the web console.
The changes to initing with an object made in this bug are OK for the following
reasons:
1) dom/base/Console.cpp: Always clears its exception before coming off the stack.
2) dom/base/nsDOMClassInfo.cpp: Inits with a non-web global.
3) dom/base/nsFrameMessageManager.cpp: Inits with a non-web global.
4) dom/media/MediaPermissionGonk.cpp: We probably want the caller to notice if
anything here throws.
5) dom/xbl/nsXBLPrototypeBinding.cpp: Inits with a non-web global.
6) dom/xul/nsXULElement.cpp: Inits with a non-web global.
7) extensions/pref/autoconfig/src/nsJSConfigTriggers.cpp: Inits with a non-web global.
8) ipc/testshell/XPCShellEnvironment.cpp: Inits with a non-web global.
Using a simple |const char*| is more memory-efficient than allocating a
JS string. We still have to allocate the JS string for passing things
into JS, but ideally we will be able to move the point of allocation
much closer to where it's actually needed, rather than indiscriminantly
doing it all the time.
The bulk of this commit was generated with a script, executed at the top
level of a typical source code checkout. The only non-machine-generated
part was modifying MFBT's moz.build to reflect the new naming.
CLOSED TREE makes big refactorings like this a piece of cake.
# The main substitution.
find . -name '*.cpp' -o -name '*.cc' -o -name '*.h' -o -name '*.mm' -o -name '*.idl'| \
xargs perl -p -i -e '
s/nsRefPtr\.h/RefPtr\.h/g; # handle includes
s/nsRefPtr ?</RefPtr</g; # handle declarations and variables
'
# Handle a special friend declaration in gfx/layers/AtomicRefCountedWithFinalize.h.
perl -p -i -e 's/::nsRefPtr;/::RefPtr;/' gfx/layers/AtomicRefCountedWithFinalize.h
# Handle nsRefPtr.h itself, a couple places that define constructors
# from nsRefPtr, and code generators specially. We do this here, rather
# than indiscriminantly s/nsRefPtr/RefPtr/, because that would rename
# things like nsRefPtrHashtable.
perl -p -i -e 's/nsRefPtr/RefPtr/g' \
mfbt/nsRefPtr.h \
xpcom/glue/nsCOMPtr.h \
xpcom/base/OwningNonNull.h \
ipc/ipdl/ipdl/lower.py \
ipc/ipdl/ipdl/builtin.py \
dom/bindings/Codegen.py \
python/lldbutils/lldbutils/utils.py
# In our indiscriminate substitution above, we renamed
# nsRefPtrGetterAddRefs, the class behind getter_AddRefs. Fix that up.
find . -name '*.cpp' -o -name '*.h' -o -name '*.idl' | \
xargs perl -p -i -e 's/nsRefPtrGetterAddRefs/RefPtrGetterAddRefs/g'
if [ -d .git ]; then
git mv mfbt/nsRefPtr.h mfbt/RefPtr.h
else
hg mv mfbt/nsRefPtr.h mfbt/RefPtr.h
fi
--HG--
rename : mfbt/nsRefPtr.h => mfbt/RefPtr.h
Kris Maglione
Boris Zbarsky
Thomas Wisniewski
Michael Layzell
Olli Pettay
Ms2ger
Nathan Froyd
Wes Kocher
Nathan Froyd
Kyle Huey
Jan de Mooij
Bobby Holley
Tom Tromey
Ryan VanderMeulen
Andrew McCreight
Jim Blandy
Eddy Bruël