Make `absl::StatusOr::AssignStatus` public. Recommend against using it outside of generic programming

PiperOrigin-RevId: 529484669
Change-Id: I9889a9f7a7fa7dc6ef8c731f1b583a74e6afd2cf

Also do some minor refactoring in btree.h.

PiperOrigin-RevId: 529460378
Change-Id: I278833ada93bbb7652e149fceed08ce3485e4312

PiperOrigin-RevId: 529423722
Change-Id: Ib1cc427299100956c0f2ae6cb5214467ef5a3790

PiperOrigin-RevId: 529119690
Change-Id: If585274c409e2a344c8d60759da6f8f990023d29

PiperOrigin-RevId: 529086715
Change-Id: Id5462322d5707a1b4475438520fcb70ee7b15450

When we insert a new element, when ASan is enabled, we replace the node that the new element is on in order to try to detect cases of code depending on pointer/reference-stability.

PiperOrigin-RevId: 528826645
Change-Id: Ie5c15c13016a8aa831a0d1edc3ad33c1f5ca4d65

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1433

Some 32-bit configurations may use 64-bit time_t, which leads to different layout of userspace timespec and the one expected by SYS_futex implementation in kernel. In particular the issue occurs when using musl libc which has switched to unconditional 64-bit time_t definition.

This patch introduces custom struct timespec with two longs when old SYS_futex is used to match the kernel timespec definition.
Merge 2eaca415da825b3f31a90f58a35bdef2b6d2a6c5 into f8bf9091

Merging this change closes #1433

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1433 from olegartys:futex_time64_bug 2eaca415da825b3f31a90f58a35bdef2b6d2a6c5
PiperOrigin-RevId: 528796119
Change-Id: Idaa952f64bd97c6dc9703a8b44deac43e29ff9ae

on timing as flaky.

This will run them up to 3 times (in the default configuration) and only
consider the test failed if it fails each time.

PiperOrigin-RevId: 528785128
Change-Id: I4aa5b74aa3a6873c83f2a01734c679351b1cd5d0

Instantiate LogMessage::CopyToEncodedBuffer separately for literals and non-literals to save an instruction at each operator<<(string) callsite.

The operator<<s get inlined at the callsite.  The saved instruction is a 'load immediate' to put the StringType argument in a register for passing.

This does make the logging TU slightly larger, but it will be an overall size win for all but the smallest programs.  Smaller, faster code at callsites is worth it anyway.

PiperOrigin-RevId: 528569773
Change-Id: Id8185266a975a12ab6f1a553c2c0846261822396

PiperOrigin-RevId: 528547013
Change-Id: I9b57ee062ef666d6a34696778ff16a46c5ccb17d

Shrink most LOG callsites by one instruction (SysV x86_64 ABI) by dispatching to per-severity constructors and omitting the severity argument.

In that particular ABI, the empty tag structs are NO_CLASS and don't appear in the generated code.

https://godbolt.org/z/crqaPh8Kv

PiperOrigin-RevId: 527989179
Change-Id: I365f11f6ca1de2623690d0a04e6f02f7de82b1fc

These functions are meant to allow for avoiding complex SFINAE pre-C++17.

PiperOrigin-RevId: 527968428
Change-Id: I6524206c9dc50663d7c38abf6d0e8080ca93fc30

PiperOrigin-RevId: 527598377
Change-Id: I0ae1505db595b7f3a420f2f608c6e02f8800f138

PiperOrigin-RevId: 527066823
Change-Id: Ifa1e9a43c7490b34f9f4dbfa12d3acbed6b49777

PiperOrigin-RevId: 526675031
Change-Id: Ib84423ccea2d0183166194a0916a97a7ed32915c

PiperOrigin-RevId: 526653332
Change-Id: I0a20d4ac636da3f1a930f96e0cdb9275527e4688

PiperOrigin-RevId: 526644558
Change-Id: I050162c2c0d667c32f7e11f51201054cca52667d

Currently static analysis tools built using the Clang Dataflow Analysis framework can't prove that code under `switch (0) case 0:` is executed on all paths. The Clang Dataflow Analysis framework should ultimately be improved to handle these cases. In the meantime, to enable the use of such tools in their current state, we add a `default` case back to the `switch` statement in `ABSL_LOG_INTERNAL_STATELESS_CONDITION` to help them understand that the code is executed on all paths.

PiperOrigin-RevId: 526638852
Change-Id: I49490dd477ba777aae2530697b75b583242aebc5

`AbslHashValue()` applied to a C-style array simply decays the array to a pointer and hashes that, which is very unlikely to be what the author intended.

PiperOrigin-RevId: 525923741
Change-Id: I876dbde341f0b0642fa3d10e3f67b0b31d0311bf

for __ANDROID_API__ >= 30

https://android.googlesource.com/platform/bionic/+/69010802d037dbc10377416bd9cc696fa34b9384%5E%21/libc/include/pthread.h

PiperOrigin-RevId: 525815479
Change-Id: I88cd1a06a4f7bb5380ff7c1e6a8f45e2b04b7df8

PiperOrigin-RevId: 525808747
Change-Id: I01aeef6b8558673bf1fc38a948dcecf00300b641

PiperOrigin-RevId: 525792213
Change-Id: I4386385e6e05d74a4ccc18cea505530e919f0e28

This lets us avoid having to do the addition manually.

PiperOrigin-RevId: 525462751
Change-Id: Ibd6202cb95e79a48a6b39ccc4b74ead04128eb91

PiperOrigin-RevId: 525241200
Change-Id: I8d1536cb813da8b80a978340343b0243a49928f7

PiperOrigin-RevId: 525178448
Change-Id: I0f35a38f23316b25621148b7fe59becf72bafeff

Add an API to clear the saved LogBacktraceAt location, and call it when setting an empty or invalid flag value.

PiperOrigin-RevId: 525065479
Change-Id: I3c0822db8301e0999b0669394b415df82edd445f

PiperOrigin-RevId: 524368346
Change-Id: I68b57a1abc8d805aa5cb4b45c5d7449ade231579

PiperOrigin-RevId: 524347923
Change-Id: I4538eb8d5d6e8befbeb8ab992b0ad44dd8f4f00c

Reland "Get rid of tail padding within `absl::Duration`. This reduces memory usage needs when storing duration in containers (e.g. `vector<absl::Duration>` uses 25% less memory), and allows classes with `absl::Duration` fields to fit other stuff in memory previously used by tail padding (e.g. `std::optional<absl::Duration>` is now 16 bytes instead of 24)."

PiperOrigin-RevId: 524256689
Change-Id: Ibf40d9e5411020179fa34c972349c7b58aa9d908

PiperOrigin-RevId: 524112966
Change-Id: I197f98f95b1c4de7f53295a6a01db9b0379b4f55

tests under sanitizers. The overrides break the sanitizers.

PiperOrigin-RevId: 524037272
Change-Id: I85b87d3870c488cb316505e94b394c6f98e9f60f

for relative timeouts

PiperOrigin-RevId: 523789416
Change-Id: Ide4cfdcae9ea7bffca3355c80ea9c8833a9536e6

PiperOrigin-RevId: 523745259
Change-Id: Ia2be4ee672a4c1b72c6ecc035ed9c2e401b56d1e

In debug mode, detect cases of btree comparators that violate transitivity, i.e. comp(A,B) && comp(B,C) -> comp(A,C).

When inserting a new element, we verify that the key is ordered correctly with respect to all the other values on the node, which can be done in constant time.

PiperOrigin-RevId: 523729309
Change-Id: Idb5a5912a9aa5411d086cb9fa76791523046778a

std::is_trivially_copyable

PiperOrigin-RevId: 523724345
Change-Id: Id68c79c3bbb253d892bdef4659ac8a926e023d12

Use Linux's prctl(PR_SET_VMA) system call to name memory arenas being
allocated using mmap(MAP_ANONYMOUS).

This change allows Abseil's memory arena(s) to be distinguished from
other uses of anonymous memory within a process, which in turn helps
investigations into the memory usage of applications.

The change adds a new prctl() system call to the code paths that call
mmap(). This is not expected to add significant overhead to applications.

The call to prctl(PR_SET_VMA, ...) can fail if the Linux kernel in use was
not configured with the CONFIG_ANON_VMA_NAME kernel option.  This should
be OK since the naming memory regions is primarily a debugging aid.

PiperOrigin-RevId: 523687348
Change-Id: Ie404e5eeef0a6da53330b3a56149c4f3bc6bf5c7