We currently turn off the C++14 sized-deallocation facility on MSVC, and
we'd like to ensure we do the same thing for clang and gcc. To do so,
we add new functionality to moz.configure for checking and adding
compilation flags, similar to the facility for checking and adding
warning flags. The newly added facility is then used to add
-fno-sized-deallocation to the compilation flags, when the option is
supported.
Once we do this, we can't define the sized deallocation functions in
mozalloc.h; the compiler will complain that we are using
-fno-sized-deallocation, yet defining these special functions that we'll
never use. These functions were added for MinGW, where we needed to
compile with C++14 ahead of other platforms to be compatible with MSVC
headers. But they're no longer necessary, though they would be if we
removed -fno-sized-deallocation; the compiler will complain if we do
that and we'll add them back at that point.
mozalloc_abort is not marked as a noreturn function on ARM, so clang
complains when abort calls mozalloc_abort, which calls MOZ_CRASH, which
calls abort(). We know this is OK, so just disable the warning.
jemalloc_ptr_info() gives info about any pointer, such as whether it's within a
live or free allocation, and if so, info about that allocation. It's useful for
debugging.
moz_malloc_enclosing_size_of() uses jemalloc_ptr_info() to measure the size of
an allocation from an interior pointer. It's useful for memory reporting,
especially for Rust code.
--HG--
extra : rebase_source : caa19cccf8c2d1f79cf004fe6a408775de5a7b22
This avoids many additions of `extern "C"` in C++ code and will avoid
having to do the same to mozjemalloc once built as C++.
--HG--
extra : rebase_source : af55696262f40a9dd16a19c29edcb9bb307d4957
This avoids many additions of `extern "C"` in C++ code and will avoid
having to do the same to mozjemalloc once built as C++.
--HG--
extra : rebase_source : af55696262f40a9dd16a19c29edcb9bb307d4957
1. The current asynchronous behavior is pointless, because we still remove the
hashtable entry synchronously, which deletes the value, and it's the value
we're using.
2. Trying to asynchronously delete the value is difficult, and not currently
needed because we can't get a memory-pressure notification while we're using
the value, and hence can't expire it from the expiration tracker.
Note: we can't get this memory-pressure notification because the stage 2 of
mozalloc_handle_oom() to reclaim memory when OOM is not implemented yet.
Bug 1207519 added maybe_pod_* methods to the allocation policy
classes, but did not add them to InfallibleAllocPolicy.
I think the idea of these methods is that the callers are explicitly
opting into fallible behavior, so they will deal with any errors that
occur. For instance, in js::HashTable, this is used to try to shrink
the hash table when there are a lot of unused entries. If the shrink
fails, it just continues to use the existing block of memory.
However, having fallible methods in a supposedly infallible class is
weird, so for now, just use the infallible version.
MozReview-Commit-ID: 97D66Z4oLfl
--HG--
extra : rebase_source : 9a3e0b50a5602a8e4772da88c16e1715c25da7df
Code that uses InfallibleAllocPolicy presumably wants for operations
to always succeed. However, Vector and HashTable can end up detecting
that growing the data structure will fail due to integer overflow, and
then will call reportAllocOverflow() and fail. I think these cases
should crash.
In addition, pod_malloc and pod_realloc should crash rather than
returning NULL when they detect overflow.
This calls mozalloc_abort rather than MOZ_CRASH directly to avoid
circular #includes, because Assertions.h includes nsTraceRefcnt.h
which includes nscore.h which includes mozalloc.h.
MozReview-Commit-ID: 1g99BXLceQI
--HG--
extra : rebase_source : 927d842588c1f85a50a7a1c50a5546d5f688555f
This removes the unnecessary setting of c-basic-offset from all
python-mode files.
This was automatically generated using
perl -pi -e 's/; *c-basic-offset: *[0-9]+//'
... on the affected files.
The bulk of these files are moz.build files but there a few others as
well.
MozReview-Commit-ID: 2pPf3DEiZqx
--HG--
extra : rebase_source : 0a7dcac80b924174a2c429b093791148ea6ac204
The Win32 has non-malloc based heap allocation functions. They are not
widely used in the Gecko code base, but there are a few places that do
use them. They could be replaced with uses of malloc/free/realloc or
new/delete, but there is now an entirely separate problem that
requires wrapping those functions: the Rust static libraries are using
those functions to allocate memory.
Since the introduction of the STL wrappers, they have included
mozalloc.h, and multiple times, we've hit header reentrancy problems,
and worked around them as best as we could.
Taking a step back, all mozalloc.h does is:
- declare moz_* allocator functions.
- define inline implementations of various operator new/delete variants.
The first only requires the functions to be declared before they are used,
so mozalloc.h only needs to be included before anything that would use
those functions.
The second doesn't actually require a specific order, as long as the
declaration for those functions comes before their use, and they are
either declared in <new> or implicitly by the C++ compiler.
So all in all, it doesn't matter that mozalloc.h is included before the
wrapped STL headers. What matters is that it's included when STL headers
are included. So arrange things such that mozalloc.h is included after
the first wrapped STL header is fully preprocessed (and all its includes
have been included).
It's an annotation that is used a lot, and should be used even more, so a
shorter name is better.
MozReview-Commit-ID: 1VS4Dney4WX
--HG--
extra : rebase_source : b26919c1b0fcb32e5339adeef5be5becae6032cf
The patch removes 455 occurrences of FAIL_ON_WARNINGS from moz.build files, and
adds 78 instances of ALLOW_COMPILER_WARNINGS. About half of those 78 are in
code we control and which should be removable with a little effort.
--HG--
extra : rebase_source : 82e3387abfbd5f1471e953961d301d3d97ed2973
The bulk of this commit was generated by running:
run-clang-tidy.py \
-checks='-*,llvm-namespace-comment' \
-header-filter=^/.../mozilla-central/.* \
-fix
We need to use _impl variants within mozalloc.h when they are defined because
of how mozglue.dll is linked on Windows, where using malloc/free would use
the symbols from the MSVCRT instead of ours.
Nathan Froyd
Sylvestre Ledru
Tom Ritter
Chris Manchester
Nicholas Nethercote
Sebastian Hengst
Botond Ballo
Petr Sumbera
Jeff Gilbert
Mike Hommey
Carsten "Tomcat" Book
Bevis Tseng
Dimitry Andric
Wes Kocher
Emanuel Hoogeveen
Andrew McCreight
Tom Tromey
Bill McCloskey
Chris Peterson
Jan Beich
Lee Salzman
Birunthan Mohanathas
Ted Mielczarek
Christian Holler
Jim Blandy
ISHIKAWA, Chiaki