The Lexan and MSVC toolchains both set _MSC_VER. The MSVC toolchain must set `ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE` and `ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE`, in order to use Abseil workarounds in the absence of these types. This is not necessary for clang-cl.
This change excludes clang-cl from the predicate setting these variables.
PiperOrigin-RevId: 465589196
Change-Id: I0426ec4f844aabe7cdde5c60725f6a9a6b16479f
There's no point redefining these functions if they are supported by the compiler and the version of libstdc++. Also, some of the builtins used by the absl implementation of these functions (e.g. __has_trivial_destructor) have been deprecated in Clang 15.
PiperOrigin-RevId: 465554125
Change-Id: I8674c3a5270ce3c654cdf58ae7dbd9d2bda8faa5
In the case that we are unwinding with context, if the retreived frame pointer
matches the signal context, assume that the value is valid and do not perform
confidence checks. In any other case, continue to perform some validation to
avoid returning an incorrect frame pointer.
Given that the VDSO path is currently untested, remove the code to simplify the
logic in the frame walking.
PiperOrigin-RevId: 465360612
Change-Id: Iac656012182a12814bafecf20225ba68b90b4db1
The change breaks existing code by changing the return type of absl::bit_width.
PiperOrigin-RevId: 465295951
Change-Id: Id4ce7c2ac3699ce22aa2b4851a949f9e0104a3d7
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .cc files in dirs n-t, except string.)
Bug: chromium:1292951
PiperOrigin-RevId: 465287204
Change-Id: I0fe98ff78bf3c08d86992019eb626755f8b6803e
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .cc files in strings/, except /internal/.)
Bug: chromium:1292951
PiperOrigin-RevId: 465285043
Change-Id: I37e9d1b4c4e9aa655b720da1467927af2aba995e
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .cc files in dirs a-h.)
Bug: chromium:1292951
PiperOrigin-RevId: 464541951
Change-Id: If23b63ccea8e9b730159ff1c7288e9300a40b6bd
The changes in d6f96eda14 enabled handling cases
where the stack may be non-contiguous or not fully symbolicated (e.g. in cases
of alternate signal stacks). However, it did not properly honour the requests
from the caller to perform a strict unwinding where such frames are terminated
upon the discontinuity. This repairs that condition.
Hoist the alignment check since that is safe to perform early.
PiperOrigin-RevId: 464160529
Change-Id: Ic65645928ec60c2a3b4844f3abd4fed1b991edab
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .h and win32 .inc files.)
Bug: chromium:1292951
PiperOrigin-RevId: 463835431
Change-Id: If8e5f7f651d5cd96035e23e4623bdb08a7fedabe
The frame pointer sanity check in NextStackFrame() was more restrictive than it is necessary. The frame pointer is used to load the saved link-register and the address for the next stack frame. So it only needs to be 8-byte aligned. The aarch64 ABI does not specify an alignment requirement for the frame point.
PiperOrigin-RevId: 463368519
Change-Id: I473e05181603288f14734fe29013900c7505e201
POSIX is unclear what state a file descriptor is in after a signal is delivered in the middle of close. On Linux, the file is closed even if it returns -1 with errno=EINTR.
As such, do not use errno at all when closing files.
PiperOrigin-RevId: 462638735
Change-Id: Ie73da1f3c83b1099bef146e1ea32e9a4818597cf
In the PostSynchEvent() function, the pos integer uses an implementation
of snprintf that is fundamentally unsafe: since the return value of
snprintf is the number of characters that would have been written to the
buffer, if an operation reaches the end of the buffer with more than one
character discarded, the return value will be greater than the buffer
size, requiring a check of the buffer's current size.
Signed-off-by: Elijah Conners <business@elijahpepe.com>
In some places, we check if the amount we read is a multiple of some amount we are interested in. However, ReadFromOffset returns -1 when it errors. Certain record sizes can cause ReadFromOffset to cause us to think that we succeeded when we did not.
It also results in confusing messages in logs.
PiperOrigin-RevId: 461798762
Change-Id: I8c9c7f2cea4d1789e95e50833d5405239a47f02e
The Cord::GetCustomAppendBuffer() method provides the same functionality as Cord::GetAppendBuffer(), except that callers can specify a custom block size/limit if the method returns a newly allocated buffer.
In other words: Cord::GetAppendBuffer() defaults to CordBuffer::CreateWithDefaultLimit(), Cord::GetCustomAppendBuffer() defaults to CordBuffer::CreateWithCustomLimit().
PiperOrigin-RevId: 461231989
Change-Id: I5c03f31139d9b068feee1bea76d59e1c5e30ef07
Add a hook to permit checking whether an address is in bounds for the stack.
PiperOrigin-RevId: 460997074
Change-Id: Ib3b4d0cf656e614aa083457abb079c40ef8db0ff
using decl 'Pointee' is unused
missing #include <utility> for 'std::move'
missing #include <memory> for 'std::unique_ptr'
PiperOrigin-RevId: 460980847
Change-Id: I5ebfca39d6b93ef396b32d1b91a5d8748d43e018
Clang recently added this warning which flags inconsistencies between
array parameters in function declarations.
See https://crbug.com/1343303
PiperOrigin-RevId: 460725261
Change-Id: I57b1e99f13698c947e948c6024e3f6f4642ea189
There are many reports that sigaltstack() on Apple platforms stops
backtrace() from tracing an original stack, e.g.
* d39ead4105
* https://reviews.llvm.org/D28265
If we disable an alternate stack for signal handler, we won't be able to
catch stack overflow errors, but backrace() will work again.
This test indicates it has a 90% chance of timing out at its current 60 second limit.
Stats over 1000 runs: max = 102.5s, min = 40.4s, avg = 71.1s, dev = 11.2s
Note that if you run this test locally from a workstation without flags, it'll take maybe 3 to 5 seconds. However, the test is run with config of android_arm, which seems to drastically change the execution time.
PiperOrigin-RevId: 459503103
Change-Id: I7b7aaa2db7880370f47d1a83d295a3234f738a18
Adds policy checks the raise the minimum C++ version to C++14
and the minimum GCC version to GCC 5
Updates the docs to indicate the C++14 minimum.
PiperOrigin-RevId: 459401288
Change-Id: I18878f0e13001c57e97e26ad7c9a9c9c12c39265
This seems to have caused some regressions by causing a flaky failure in some
cases. Revert the change to enable investigation.
PiperOrigin-RevId: 459331687
Change-Id: Iaa4e4bfcb3013a75a2cd72768d980ac5e450f70c
The alternate signal stack may be sufficiently beyond the esimated frame size
(100k). If we run into the case that the frame is not in the correct direction
assume that the frames may be non-contiguous due to an alternate signal stack
layout. In such a case, if we find that there is an alternate stack configured,
ignore the discontiuity (assuming that it is a removable point-wise
discontinuity) and continue the stack unwinding. This permits us to capture
stack traces in more cases.
PiperOrigin-RevId: 458327775
Change-Id: Ia8b461847401492f72a23ba26601c72e0109402c
Abseil Team
Copybara-Service
Kim Hyun
Gennadiy Rozental
Saleem Abdulrasool
Thomas Köppe
Evan Brown
David Majnemer
Elijah Conners
Andy Getzendanner
Benjamin Barenblat
Martijn Vels
Dino Radakovic
Andrei Polushin
Derek Mauro
Bruno Pitrus