When we modify the debug map, we could be racing with the system linker,
either when we modify the entries or when we change page protection
flags. To fix the race, we need to take the system linker's internal
lock when we perform any kind of modification on the debug map.
One way to hold the system linker lock is to call dl_iterate_phdr, and
perform our actions inside the callback, which is invoked with the
lock being held. However, dl_iterate_phdr is only present on Android
5.0+, and even then, dl_iterate_phdr is only protected by the linker
lock on Android 6.0+.
This means that with this patch, we can only safely modify the debug map
on Android 6.0+, which I think is acceptable for an operation that only
benefits a debugger.
MozReview-Commit-ID: BowBEO8tu8Z
--HG--
extra : amend_source : 837631dfc2ef17b24ffe5778bcb70dc29b7dfc66
* This allows us to use a single blocklist definition in multiple places.
* This patch also adds support for a new initialization flag that, when enabled,
disables the DLL Blocking part of the mozglue blocklist but leaves the
profiling and stackwalking suppression bits intact.
* This allows us to use a single blocklist definition in multiple places.
* This patch also adds support for a new initialization flag that, when enabled,
disables the DLL Blocking part of the mozglue blocklist but leaves the
profiling and stackwalking suppression bits intact.
--HG--
extra : rebase_source : ff4dad72f57c5662fc9e1bbd9e4efb3ff01470ef
GetThreadContext() returns a context pointing to its own frame when it
gets called with the current thread handle. That frame can go away after
it returns. This patch instead uses RtlCaptureContext(), which captures
the context of its caller, when walking the current thread.
In the past, we also used a walker thread when nullptr is passed in for
aThread, but the check doesn't cover all the cases, and having another
thread is apparently more complicated than this approach.
MozReview-Commit-ID: 3TAatDc9BLh
--HG--
extra : rebase_source : 7978cce48b8939a723cd5ccafe86d3f7aca6d3ac
GetCurrentThread() returns a pseudo handle, so comparing it against
the passed in argument doesn't make sense in most cases. This patch
changes it to using the thread id for comparison, which is guaranteed
to be unique in the whole lifetime of a thread.
MozReview-Commit-ID: 5TNAgLkcS6m
--HG--
extra : rebase_source : d5bb21ac57a4c1149b8d332ea7b28a78ed994c62
GetThreadContext() returns a context pointing to its own frame when it
gets called with the current thread handle. That frame can go away after
it returns. This patch instead uses RtlCaptureContext(), which captures
the context of its caller, when walking the current thread.
MozReview-Commit-ID: 3TAatDc9BLh
--HG--
extra : rebase_source : d5d88f0a9fa07da5b31f27c51c78ee2bfb527a8e
GetCurrentThread() returns a pseudo handle, so comparing it against
the passed in argument doesn't make sense in most cases. This patch
changes it to using the thread id for comparison, which is guaranteed
to be unique in the whole lifetime of a thread.
MozReview-Commit-ID: 5TNAgLkcS6m
--HG--
extra : rebase_source : 0e72e8f6196c8079086ca697b9a121c6987ef43e
Same approach as the other bug, mostly replacing automatically by removing
'using mozilla::Forward;' and then:
s/mozilla::Forward/std::forward/
s/Forward</std::forward</
The only file that required manual fixup was TestTreeTraversal.cpp, which had
a class called TestNodeForward with template parameters :)
MozReview-Commit-ID: A88qFG5AccP
This was done automatically replacing:
s/mozilla::Move/std::move/
s/ Move(/ std::move(/
s/(Move(/(std::move(/
Removing the 'using mozilla::Move;' lines.
And then with a few manual fixups, see the bug for the split series..
MozReview-Commit-ID: Jxze3adipUh
We are apparently still crashing even after mprotect() with write flag
returns successfully. This patch reads the flags again after mprotect()
returns, and hopefully the flags will tell the truth of whether the page
is truly writable or not after calling mprotect().
MozReview-Commit-ID: Jsg8vHKFEvJ
--HG--
extra : rebase_source : b028aa0d5cefd50302bfc2502292d9129d202e09
This also changes many references to the 'pseudo stack' to refer to the 'label
stack' instead. The label stack is one of the two stacks that are managed by
the profiling stack, the other stack being the JS interpreter stack.
MozReview-Commit-ID: Ed0YMMeCBY8
--HG--
extra : rebase_source : 5675d670f424c7d7dda04bafc2b3431fa2485e3c
The term "entry" is already used for elements in the profile buffer.
MozReview-Commit-ID: 1aB22V6veQh
--HG--
extra : rebase_source : c664eb4d6bed6cb74ba8a1b67ea99bd8ca57bcf7
extra : source : 3264c0cc0027b240b55bd3aebf27263b1e1d1cc0
The name Cpp was confusing, because C++ functions are in the native stack, not
in the pseudo stack. The pseudo stack only contains frames for manually
instrumented code that uses AutoProfilerLabel, and JS frames.
MozReview-Commit-ID: 9ptfhREo0qy
--HG--
extra : rebase_source : 76a1a32acb4c946aeb2ad45e904e419c1c9e2ad1
It was necessary back when we were doing decompression from a signal
handler, because we couldn't then have zlib call malloc, but we don't
do that anymore, so the whole wrapping is effectively unused.
With the wrapping gone, we manually initialize the zalloc, zfree and
opaque fields, as specified in the zlib documentation.
--HG--
extra : rebase_source : c4e84009e65f71f6c43362468c2934e04a8abda1
