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authorGravatar Abseil Team <absl-team@google.com>2020-02-25 08:48:42 -0800
committerGravatar CJ Johnson <johnsoncj@google.com>2020-02-25 13:12:47 -0500
commit0d5ce2797eb695aee7e019e25323251ef6ffc277 (patch)
treee8f17f3202cce51bcb9f25175349b7a61e7ba664 /absl/base
parentb69c7d880caddfc25bf348dbcfe9d45fdd8bc6e6 (diff)
Export of internal Abseil changes
-- 20405fc394419d434d3ea09b2e62e4edcb282421 by Christian Blichmann <cblichmann@google.com>: Include `status` subdirectory in main `CMakeLists.txt` PiperOrigin-RevId: 297125966 -- 101087af9689612bdda679ee0869e5cde4472244 by Matt Kulukundis <kfm@google.com>: Fix typo PiperOrigin-RevId: 296991360 -- 55ff5bc6970d46214c0459d3a7a23973c7dc69b9 by Andy Getzendanner <durandal@google.com>: Extract logging's ErrnoSaver to absl::base_internal and use it in a couple other places. PiperOrigin-RevId: 296969168 -- b7cd7550297d53766576f751436617200c65831b by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 296951474 -- 8c04c73fc53f9a09c3e2400812b931157f35fe07 by Andy Soffer <asoffer@google.com>: Auto-generate list of files in the DLL, and add new build targets to the DLL. PiperOrigin-RevId: 296932061 -- 2f77829e196094f1addefd8ac2ac9e398c5b6100 by Andy Soffer <asoffer@google.com>: Fix bug introduced by DLL where we couldn't build shared libraries on non-windows platforms. Fixes #623 PiperOrigin-RevId: 296919347 -- b768163dbbff0c561b9dff0218a699e5e4fd33f3 by Abseil Team <absl-team@google.com>: typo: microprosessor PiperOrigin-RevId: 296904933 -- b185da0dac44c91855373f0723df9242cbfb3db3 by Matthew Brown <matthewbr@google.com>: Internal cleanup PiperOrigin-RevId: 296509711 GitOrigin-RevId: 20405fc394419d434d3ea09b2e62e4edcb282421 Change-Id: I55c8eba6f353ceb337455ae144ab743ea21edbef
Diffstat (limited to 'absl/base')
-rw-r--r--absl/base/BUILD.bazel24
-rw-r--r--absl/base/CMakeLists.txt25
-rw-r--r--absl/base/attributes.h2
-rw-r--r--absl/base/internal/errno_saver.h43
-rw-r--r--absl/base/internal/errno_saver_test.cc44
-rw-r--r--absl/base/internal/spinlock_linux.inc5
-rw-r--r--absl/base/internal/spinlock_posix.inc6
7 files changed, 142 insertions, 7 deletions
diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel
index c6948a27..bae79427 100644
--- a/absl/base/BUILD.bazel
+++ b/absl/base/BUILD.bazel
@@ -41,6 +41,17 @@ cc_library(
)
cc_library(
+ name = "errno_saver",
+ hdrs = ["internal/errno_saver.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl:__subpackages__",
+ ],
+ deps = [":config"],
+)
+
+cc_library(
name = "log_severity",
srcs = ["log_severity.cc"],
hdrs = ["log_severity.h"],
@@ -87,6 +98,7 @@ cc_library(
deps = [
":base_internal",
":core_headers",
+ ":errno_saver",
],
)
@@ -287,6 +299,18 @@ cc_test(
],
)
+cc_test(
+ name = "errno_saver_test",
+ size = "small",
+ srcs = ["internal/errno_saver_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":errno_saver",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
cc_library(
name = "exception_testing",
testonly = 1,
diff --git a/absl/base/CMakeLists.txt b/absl/base/CMakeLists.txt
index c21571be..14c52eab 100644
--- a/absl/base/CMakeLists.txt
+++ b/absl/base/CMakeLists.txt
@@ -30,6 +30,17 @@ absl_cc_library(
absl_cc_library(
NAME
+ errno_saver
+ HDRS
+ "internal/errno_saver.h"
+ DEPS
+ absl::config
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+)
+
+absl_cc_library(
+ NAME
log_severity
HDRS
"log_severity.h"
@@ -73,6 +84,7 @@ absl_cc_library(
DEPS
absl::base_internal
absl::core_headers
+ absl::errno_saver
)
absl_cc_library(
@@ -307,6 +319,19 @@ absl_cc_test(
absl_cc_test(
NAME
+ errno_saver_test
+ SRCS
+ "internal/errno_saver_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::errno_saver
+ gmock
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
throw_delegate_test
SRCS
"throw_delegate_test.cc"
diff --git a/absl/base/attributes.h b/absl/base/attributes.h
index 8f77db77..ff138629 100644
--- a/absl/base/attributes.h
+++ b/absl/base/attributes.h
@@ -575,7 +575,7 @@
// When applying ABSL_ATTRIBUTE_PACKED only to specific structure members the
// natural alignment of structure members not annotated is preserved. Aligned
// member accesses are faster than non-aligned member accesses even if the
-// targeted microprosessor supports non-aligned accesses.
+// targeted microprocessor supports non-aligned accesses.
#if ABSL_HAVE_ATTRIBUTE(packed) || (defined(__GNUC__) && !defined(__clang__))
#define ABSL_ATTRIBUTE_PACKED __attribute__((__packed__))
#else
diff --git a/absl/base/internal/errno_saver.h b/absl/base/internal/errno_saver.h
new file mode 100644
index 00000000..251de510
--- /dev/null
+++ b/absl/base/internal/errno_saver.h
@@ -0,0 +1,43 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
+#define ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
+
+#include <cerrno>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+
+// `ErrnoSaver` captures the value of `errno` upon construction and restores it
+// upon deletion. It is used in low-level code and must be super fast. Do not
+// add instrumentation, even in debug modes.
+class ErrnoSaver {
+ public:
+ ErrnoSaver() : saved_errno_(errno) {}
+ ~ErrnoSaver() { errno = saved_errno_; }
+ int operator()() const { return saved_errno_; }
+
+ private:
+ const int saved_errno_;
+};
+
+} // namespace base_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
diff --git a/absl/base/internal/errno_saver_test.cc b/absl/base/internal/errno_saver_test.cc
new file mode 100644
index 00000000..b845e2dd
--- /dev/null
+++ b/absl/base/internal/errno_saver_test.cc
@@ -0,0 +1,44 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/errno_saver.h"
+
+#include <cerrno>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace {
+using ::testing::Eq;
+
+struct ErrnoPrinter {
+ int no;
+};
+std::ostream &operator<<(std::ostream &os, ErrnoPrinter ep) {
+ return os << strerror(ep.no) << " [" << ep.no << "]";
+}
+bool operator==(ErrnoPrinter one, ErrnoPrinter two) { return one.no == two.no; }
+
+TEST(ErrnoSaverTest, Works) {
+ errno = EDOM;
+ {
+ absl::base_internal::ErrnoSaver errno_saver;
+ EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
+ errno = ERANGE;
+ EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{ERANGE}));
+ EXPECT_THAT(ErrnoPrinter{errno_saver()}, Eq(ErrnoPrinter{EDOM}));
+ }
+ EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
+}
+} // namespace
diff --git a/absl/base/internal/spinlock_linux.inc b/absl/base/internal/spinlock_linux.inc
index 28e29d19..323edd62 100644
--- a/absl/base/internal/spinlock_linux.inc
+++ b/absl/base/internal/spinlock_linux.inc
@@ -19,12 +19,12 @@
#include <unistd.h>
#include <atomic>
-#include <cerrno>
#include <climits>
#include <cstdint>
#include <ctime>
#include "absl/base/attributes.h"
+#include "absl/base/internal/errno_saver.h"
// The SpinLock lockword is `std::atomic<uint32_t>`. Here we assert that
// `std::atomic<uint32_t>` is bitwise equivalent of the `int` expected
@@ -51,12 +51,11 @@ extern "C" {
ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
std::atomic<uint32_t> *w, uint32_t value, int loop,
absl::base_internal::SchedulingMode) {
- int save_errno = errno;
+ absl::base_internal::ErrnoSaver errno_saver;
struct timespec tm;
tm.tv_sec = 0;
tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
syscall(SYS_futex, w, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, value, &tm);
- errno = save_errno;
}
ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(std::atomic<uint32_t> *w,
diff --git a/absl/base/internal/spinlock_posix.inc b/absl/base/internal/spinlock_posix.inc
index f025b5f8..fcd21b15 100644
--- a/absl/base/internal/spinlock_posix.inc
+++ b/absl/base/internal/spinlock_posix.inc
@@ -15,10 +15,11 @@
// This file is a Posix-specific part of spinlock_wait.cc
#include <sched.h>
+
#include <atomic>
#include <ctime>
-#include <cerrno>
+#include "absl/base/internal/errno_saver.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/port.h"
@@ -27,7 +28,7 @@ extern "C" {
ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop,
absl::base_internal::SchedulingMode /* mode */) {
- int save_errno = errno;
+ absl::base_internal::ErrnoSaver errno_saver;
if (loop == 0) {
} else if (loop == 1) {
sched_yield();
@@ -37,7 +38,6 @@ ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
nanosleep(&tm, nullptr);
}
- errno = save_errno;
}
ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(