The other option, of course, is to just define an "expando slot count" constant
in the header and then static_assert it has the right value once the
ExpandoSlots enum is declared.
js::Class op are often all null. And when they're not all null, they're often
duplicated among classes. By pulling them out into their own struct, and using a
(possibly null) pointer in js::Class, we can save 114 KiB per process on
64-bit, and half that on 32-bit.
* * *
imported patch separate-ClassOps-2
js::ClassSpec is often all null. When it's not all null, it's often duplicated
among classes. By pulling it out into its own struct, and using a (possibly
null) pointer in js::Class, we can save 138 KiB per process on 64-bit, and half
that on 32-bit.
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
JSClass::convert is no longer used after this, but to minimize the noise, it will be deleted in a separate patch. However all non-nullptr convert hook implementations must be replaced with [@@toPrimitive] methods in this patch to avoid changing the behavior.
The changes in XrayWrapper.cpp fix a pre-existing bug: when an Xray wrapper tries to emit the "Silently denied access" warning, if id is a symbol, the existing code triggers an error trying to convert it to a string for the warning message. Implementing Symbol.toPrimitive revealed this bug; the fix is straightforward.
JSClass::convert is no longer used after this, but to minimize the noise, it will be deleted in a separate patch. However all non-nullptr convert hook implementations must be replaced with [@@toPrimitive] methods in this patch to avoid changing the behavior.
The changes in XrayWrapper.cpp fix a pre-existing bug: when an Xray wrapper tries to emit the "Silently denied access" warning, if id is a symbol, the existing code triggers an error trying to convert it to a string for the warning message. Implementing Symbol.toPrimitive revealed this bug; the fix is straightforward.
