PiperOrigin-RevId: 539726003
Change-Id: Ie38f8d48a7b4c9d498fc1c4c4af6138048f80f68

This is a conservative change, in that it only contains bugfixes and allows new patterns that used to be compile errors.  There are other changes we would like to make (as reflected in the comments in char_formatting_test.cc), but we are being careful about the implications of such behavior changes.

The two implementation changes are:
* Apply integral promotions to enums before printing them, so they are always treated as integers (and not chars) by StrCat and StrFormat.
* Classify `unsigned char` and `signed char` as integer-like rather than char-like, so that `StrFormat("%v", v)` accepts those types as integers (consistent with `StrCat()`.)

The behavior changes are:
* StrCat() now accepts char-backed enums (rather than failing to compile).
* StrFormat("%v") now accepts `signed char` and `unsigned char` as integral (rather than failing to compile).
* StrFormat("%v") now correctly formats 8-bit enums as integers (rather than failing internally and emitting nothing).

Tested:
  Modified the char_formatting_test.cc case to reflect changes.
  Re-ran all other tests.
PiperOrigin-RevId: 539659674
Change-Id: Ief56335f5a57e4582af396d00eaa9e7b6be4ddc6

off_t is best for portability. Its size varies with the platform.
off64_t is non-standard, but is present in glibc and some BSDs.
It also matches the signature specified in the manual.
https://man7.org/linux/man-pages/man2/mmap.2.html

This is a re-spin of #1349, but correctly casts the type to the type
expected by the kernel for mmap2.
https://man7.org/linux/man-pages/man2/mmap2.2.html

Fixes #1473

PiperOrigin-RevId: 539656313
Change-Id: I7a30dd9d3eb6af03a99da0d93d721a86f6521b25

Introduce kHighRefcountMask which masks off flags and the LSb of the refcount value. In the cases where this mask is used, we don't need to check the LSb because we can assume the refcount is 1 when the rest of the masked RefcountAndFlags is empty, and the LSb doesn't matter if the masked value is not empty (either it's immortal or refcount > 1). This saves an instruction and a cycle (and + cmp -> tst) https://godbolt.org/z/Kz69eqfhq

PiperOrigin-RevId: 539151659
Change-Id: I2ec7d72918f052c4b0938edd746af9d5b3052c7e

PiperOrigin-RevId: 539145188
Change-Id: Ic8dc8112f77ca720a8871de57ee389f15693ab00

This fixes an endless loop in the absl Arm stack unwinder where encountering a
second signal return trampoline (as one has in nested signal frames), would restart
unwinding at the outermost signal, resulting in an endless loop.

This does not change any behavior in the non-nested signal case, so I believe
it is safe for any stack that hasn't encountered this bug already.

I would love to test this beyond the absl unwinding test cases and the
fingerprint_test included here, but I'm at a loss for other test cases.

PiperOrigin-RevId: 539113007
Change-Id: I10037f9fa77b45cc4db61f89b9c6380ec3529113

This is a simplification but not a behavior change; we used to choose %u for unsigned ints, but %u and %d generate the same output for these types.

PiperOrigin-RevId: 539104599
Change-Id: I9d7ff561b969a6287889f95063636d6b77a4a78b

PiperOrigin-RevId: 539104398
Change-Id: I6385662e0c5694d40c57887f983b16adc9eced14

This patch makes it use `memcpy` for performance and consistency with other overloads.

PiperOrigin-RevId: 539079130
Change-Id: I5aea9dd9b8a1ce708c787df7d6c9a75ae419c484

in NACL pthread_self() returns a pointer that isn't directly convertible to arithmetic type.

PiperOrigin-RevId: 539023020
Change-Id: I3745ec5565f3a99ccb1d9df12c27a80e57ca4755

PiperOrigin-RevId: 538778978
Change-Id: I0c04b09987eb4d97892825e3c994656d4e300f60

PiperOrigin-RevId: 538651091
Change-Id: Id1aa7ab287beb252f4826f70e26b7e3bfa80c462

PiperOrigin-RevId: 538534137
Change-Id: Ifb2e59c36ffce183d3c93081d9300201757f82d4

Fixes #1469

PiperOrigin-RevId: 538534014
Change-Id: Iab84f73c0a0665355b614e85c62f686dc54c8671

PiperOrigin-RevId: 538488164
Change-Id: I680dcbc2f27dca3beba416b3cd0a55943751cf4c

Update XML output to properly print special characters. Non printable characters are skipped in output. All the "whitespace-like" (including \t, \r, \n) characters printed as plain space ' '.

PiperOrigin-RevId: 538479923
Change-Id: I62dff39bb21f376d00a7b9480f8f1d31d7015e45

PiperOrigin-RevId: 538241594
Change-Id: Ie6f0d913bcf07dea2f33e47198ba952b3800d70e

This is only a workaround, working only with gcc/clang, while waiting
for a better long term fix not using std::aligned_storage, which is
tracked by b/260219225.

Add a unit test that captures the current behavior of formatting of char types and char-backed enum types through StrCat(), StrFormat("%v"), and Substitute().

This test allows us to modify the behavior in this space without introducing undesired changes elsewhere.

PiperOrigin-RevId: 537981963
Change-Id: Icda91b66efcc0dc8c263011b137e130a3db2dc19

PiperOrigin-RevId: 537825067
Change-Id: I3ce8712d5130068fb7d77b563eb502e2e9560810

PiperOrigin-RevId: 537400816
Change-Id: I06794a6b8b6a441e34121047024380190d42869a

PiperOrigin-RevId: 537372070
Change-Id: I46ff6e42856aea2cd8da6ff7105cf58613603dd4

PiperOrigin-RevId: 537120102
Change-Id: I7952e53aca10319eb433e4c4d60cf3d7fe74d19a

PiperOrigin-RevId: 537088042
Change-Id: I6ef219a1a76baf3a751a6084a8fb8639c9bdac51

PiperOrigin-RevId: 537078029
Change-Id: Ibf0be0a8e83f62d492e96f1f1ed7839dbde30fae

Note that RE2 has taken a dependency on Abseil, so the `main` branch
should be used from now on. The `abseil` branch will go away soon...

PiperOrigin-RevId: 536941231
Change-Id: I502fc643a3763de51292396297b0939613473485

 https://google.github.io/styleguide/cppguide.html#Function_Comments

PiperOrigin-RevId: 536785792
Change-Id: I2963dea81a75b01b7275d784f6a2908816d0c7bf

Motivation is for WebAssembly to avoid perror which in turn requires file system emulation.

PiperOrigin-RevId: 536737294
Change-Id: I5177064c9451fb630ec5e9d0c0a0679fabd98afa

This avoids the need to use filesystem APIs just to write to stderr, which emscripten implements the same as this under the hood.

PiperOrigin-RevId: 536525710
Change-Id: I0a647a4593eacfba324505b6e8c4acfb577ac839

the cyclecounter by default, since it may be unsafe in some situations
(for example, if the system may enter a sleep state).

Fixes #1460

PiperOrigin-RevId: 535641718
Change-Id: I41c9cc4bc7a8ae7280ff9df00abd57668205045b

PiperOrigin-RevId: 535534819
Change-Id: Iccf8da3e0b084131e4c0dba205f3e190d3a66f4e

The fallback isn't totally portable, even within POSIX, but we can special case any future platforms where it's not just like this change does for Apple.

PiperOrigin-RevId: 535324103
Change-Id: Ib628925c4946b6c112373678fe37e9bb44259090

hash_test.cc leans heavily on INSTANTIATE_TYPED_TEST_SUITE_P, which is
quite memory- and CPU-hungry. Split a few heavyweight tests into a new
hash_instantiated_test.cc, reducing peak RAM consumption (or, on
multicore systems, compilation time).

PiperOrigin-RevId: 535305679
Change-Id: Ic204da0a47c749c3f7db5f902ade8d74ed3043bb

PiperOrigin-RevId: 535245982
Change-Id: I816f60c8b6476536df6836500f01c9a3ad88ddd4

PiperOrigin-RevId: 534841675
Change-Id: I6fbee6f0fe61d8dd51c9c7d93c3b47684a2f4d9f