Also remove most C++-side optimizations for avoiding calls to Rust
for short strings now that we have LTO between C++ and Rust. Since
LTO still leaves the overhead of one function call layer, inlined
function call avoidance optimization is left in place in the
IsUTF8 and in the 8-bit IsASCII cases for which perfherder flags
the difference as significant for the length 15.
Differential Revision: https://phabricator.services.mozilla.com/D40999
--HG--
extra : moz-landing-system : lando
This way we don't have to go through a bunch of printf nonsense, and we
ought to be able to arrive at optimized routines that take advantage of
constant radices, etc.
Differential Revision: https://phabricator.services.mozilla.com/D25141
--HG--
extra : moz-landing-system : lando
We should catch these issues ASAP. This NS_ASSERTION also bit me in the past.
Differential Revision: https://phabricator.services.mozilla.com/D24115
--HG--
extra : moz-landing-system : lando
This is a best effort attempt at ensuring that the adverse impact of
reformatting the entire tree over the comments would be minimal. I've used a
combination of strategies including disabling of formatting, some manual
formatting and some changes to formatting to work around some clang-format
limitations.
Differential Revision: https://phabricator.services.mozilla.com/D13371
--HG--
extra : moz-landing-system : lando
Clang format does not always reflow comments correctly to get them
within 80 columns.
The major categories of failures I have noticed in xpcom/ are:
- Comments that are lists. I fixed these by manually getting them so
they'll be within 80 columns after clang-format runs.
- Comments intermixed with lists of things like enums, initializers,
or even fields in a class. It doesn't seem to associate the comment
with the item in the list correctly. The worst cases of these happen
when it changes initializer lists from having commas at the start of
each item to having them at the end. In the initializer comma cases,
I fixed them by making the commas at the end, so clang-format won't
mix things up. For other cases, I often moved the comment for an
item onto its own line, because it was not possible to have both the
comment and the item on the same line and stay within 80 columns.
- One odd case is nsEnumeratorUtils.cpp, where the end of line comment
after a NS_DECL macro confused clang-format and made it stop
realizing that the NS_DECL thing was a complete statement. I also
added a blank line to that file before a declaration because I think
that is better.
Depends on D13183
Differential Revision: https://phabricator.services.mozilla.com/D13184
--HG--
extra : moz-landing-system : lando
There is no advantage in making these methods more restrictive on their
parameters than AssignLiteral.
The current implementation of the AppendLiteral overloads for equivalent
char_types is more permissive than AssignLiteral, but comments in the
implementation mention the possible optimization used in AssignLiteral and so
are assuming a similar constant and static storage duration restriction on its
parameter. The optimization may never be implemented, but clients that would
benefit from support for non-constant or non-static parameters are also
expected to be rare, so there is little value in ruling out the optimization
at this stage.
ReplaceLiteral currently uses the AssignLiteral optimization.
Differential Revision: https://phabricator.services.mozilla.com/D8777
--HG--
extra : moz-landing-system : lando
A character array initialized with a list of character literals will not
necessarily have a trailing null-terminator required for AssignLiteral or
trimmed in EqualsLiteral.
Depends on D8775
Differential Revision: https://phabricator.services.mozilla.com/D8951
--HG--
extra : moz-landing-system : lando
"Bound" is the term used in the C++ standard to describe the number of
elements in an array.
EqualsLiteral has no opportunity to optimize for constant and static storage
duration parameters.
Depends on D8773
Differential Revision: https://phabricator.services.mozilla.com/D8774
--HG--
extra : moz-landing-system : lando
There is no advantage in AssignASCII() for char, and AssignASCII() does not
exist for char16_t array and char_type. Similarly for ReplaceASCII and
AppendASCII. This AssignLiteral() overload already says it is not only for
ASCII.
Depends on D8771
Differential Revision: https://phabricator.services.mozilla.com/D8773
--HG--
extra : moz-landing-system : lando
Since https://hg.mozilla.org/mozilla-central/rev/9db7cf4cc385#l13.44 the type
system always excludes calls with character pointers and so there is no need
to mention this in the comment.
The comment for the 8-bit to 16-bit AssignLiteral overload is modified a
little to use "char" instead of "character" so as not to imply that anything
other than 8-bit char parameters may be provided to that overload.
The ReplaceLiteral and InsertLiteral comments are adjusted to use "character"
instead of "char" so as not to imply that the method or comment is limited to
8-bit char parameters.
Differential Revision: https://phabricator.services.mozilla.com/D8770
--HG--
extra : moz-landing-system : lando
This removes the rarely used and somewhat odd
`iterator& BeginWriting/EndWriting(iterator&)` functions that take an iterator
as an in/out param and then return it.
--HG--
extra : rebase_source : 92066f996595e9b7df9642813c08592cee47c630
XPCOM strings mark logically unused parts of nsStringBuffer as uninitialized
in debug builds by writing a marker byte and if memory checking is active,
by telling the memory checking that the range of memory is uninitialized.
This patch limits such marking to up to 16 code units to avoid quadratic
behavior, which is especially bad when there's a large disparity between
length and capacity (after a call to SetCapacity()).
The assumption here is that even a small poisoned memory range is enough
to detect the bugs that the poisoning is intended to detect.
MozReview-Commit-ID: 178rp0ckztj
Differential Revision: https://phabricator.services.mozilla.com/D5838
--HG--
extra : moz-landing-system : lando
This restores the old allocation semantics for "append" operations between
Latin1 and UTF-16 while keeping the buffer re-use optimization for the
"assign" cases.
MozReview-Commit-ID: 8JCw3AaCNLN
Differential Revision: https://phabricator.services.mozilla.com/D3582
--HG--
extra : moz-landing-system : lando
Shrinking the buffer is purely a memory footprint optimization and can be
omitted as far as the string semantics visible to the caller are concerned.
Since shrinking is optional, it doesn't make sense to propagate error when
it fails due to OOM.
MozReview-Commit-ID: BuyBLCBmYzZ
Differential Revision: https://phabricator.services.mozilla.com/D3866
--HG--
extra : moz-landing-system : lando
Alex Henrie
Mihai Alexandru Michis
Boris Zbarsky
Henri Sivonen
Hiroyuki Ikezoe
Nathan Froyd
Cameron McCormack
Sylvestre Ledru
Ciure Andrei
Emilio Cobos Álvarez
Ehsan Akhgari
Andrew McCreight
Karl Tomlinson
Eric Rahm
Margareta Eliza Balazs