It was accidentally changed from 524288 to 32768 on Android by bug 1448222.
This commit changes it back.
--HG--
extra : rebase_source : 9181928dccf0cfcd0f70c1c3840d43c378f38ca4
The main change is that the patch copies js/public/HashTable.h to
mfbt/HashTable.h, and then changes it as follows.
- Changes `js` namespaces to `mozilla` (and removes some now-unnecessary
`mozilla::` qualifiers).
- Changes the default AllocPolicy from the SpiderMonkey-specific
`TempAllocPolicy` to the generic `MallocAllocPolicy`.
- Adds `#include "AllocPolicy.h"` (like mfbt/Vector.h).
- Changes `JS_DEBUG` use to `DEBUG`.
- Minor comment updates, as necessary.
js/public/HashTable.h is now tiny, holding just a few renamings of things from
the `mozilla` namespace into the `js` namespace to minimize churn elsewhere.
(Those renamings keep `TempAllocPolicy` as the default AllocPolicy for
js::Hash{Set,Map}.)
Also, various template specializations had to be moved from the `js` namespace
to the `mozilla` namespace to avoid compile errors.
MozReview-Commit-ID: GS9Qn9YeYDA
--HG--
rename : js/public/HashTable.h => mfbt/HashTable.h
DONTBUILD because NPOTB.
--HG--
extra : _rewrite_noise : b71a655d40278495b9049ba3e167ec2540ce3ead
extra : rebase_source : ea8d4a767eb330107967d1010ec627a91d0b3dff
extra : topic : jorendb.fix
extra : amend_source : 2a9e9d7bf19a5ef8c43bce3bf374aac15d90e725
Currently we have three ways of representing hash values.
- uint32_t: used in HashFunctions.h.
- PLDHashNumber: defined in PLDHashTable.{h,cpp}.
- js::HashNumber: defined in js/public/Utility.h.
Functions that create hash values with functions from HashFunctions.h use a mix
of these three types. It's a bit of a mess.
This patch introduces mozilla::HashNumber, and redefines PLDHashNumber and
js::HashNumber as synonyms. It also changes HashFunctions.h to use
mozilla::HashNumber throughout instead of uint32_t.
This leaves plenty of places that still use uint32_t that should use
mozilla::HashNumber or one of its synonyms, but I didn't want to tackle that
now.
The patch also:
- Does similar things for the constants defining the number of bits in each
hash number type.
- Moves js::HashNumber from Utility.h to HashTable.h, which is a better spot
for it. (This required changing the signature of ScrambleHashCode(); that's
ok, it'll get moved by the next patch anyway.)
MozReview-Commit-ID: EdoWlCm7OUC
--HG--
extra : rebase_source : 5b92c0c3560eb56850cd8832f8ee514d25e3c16f
Because it's more precise, and gives us more consistency.
MozReview-Commit-ID: BLYXYSHgZ7v
--HG--
extra : rebase_source : 527379499a7f2868e032982d7967005df6599bf1
Everything that goes in a PLDHashtable (and its derivatives, like
nsTHashtable) needs to inherit from PLDHashEntryHdr. But through a lack
of enforcement, copy constructors for these derived classes didn't
explicitly invoke the copy constructor for PLDHashEntryHdr (and the
compiler didn't invoke the copy constructor for us). Instead,
PLDHashTable explicitly copied around the bits that the copy constructor
would have.
The current setup has two problems:
1) Derived classes should be using move construction, not copy
construction, since anything that's shuffling hash table keys/entries
around will be using move construction.
2) Derived classes should take responsibility for transferring bits of
superclass state around, and not rely on something else to handle
that.
The second point is not a huge problem for PLDHashTable (PLDHashTable
only has to copy PLDHashEntryHdr's bits in a single place), but future
hash table implementations that might move entries around more
aggressively would have to insert compensation code all over the place.
Additionally, if moving entries is implemented via memcpy (which is
quite common), PLDHashTable copying around bits *again* is inefficient.
Let's fix all these problems in one go, by:
1) Explicitly declaring the set of constructors that PLDHashEntryHdr
implements (and does not implement). In particular, the copy
constructor is deleted, so any derived classes that attempt to make
themselves copyable will be detected at compile time: the compiler
will complain that the superclass type is not copyable.
This change on its own will result in many compiler errors, so...
2) Change any derived classes to implement move constructors instead
of copy constructors. Note that some of these move constructors are,
strictly speaking, unnecessary, since the relevant classes are moved
via memcpy in nsTHashtable and its derivatives.
Jon Coppeard
Nicholas Nethercote
Jan de Mooij
Andrew Swan
Steve Fink
Tooru Fujisawa
Coroiu Cristina
Cosmin Sabou
Jonathan Kew
Andreea Pavel
Robert Bartlensky
qiaopengcheng
Dave Townsend
Jeff Walden
Andrea Marchesini
Nathan Froyd