diff options
| -rw-r--r-- | FAQ.md (renamed from absl/FAQ.md) | 0 | ||||
| -rwxr-xr-x | absl/abseil.podspec.gen.py | 18 | ||||
| -rw-r--r-- | absl/base/config.h | 14 | ||||
| -rw-r--r-- | absl/container/node_hash_set.h | 4 | ||||
| -rw-r--r-- | absl/debugging/failure_signal_handler.cc | 13 | ||||
| -rw-r--r-- | absl/flags/BUILD.bazel | 1 | ||||
| -rw-r--r-- | absl/flags/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | absl/flags/internal/flag.cc | 29 | ||||
| -rw-r--r-- | absl/flags/internal/flag.h | 19 | ||||
| -rwxr-xr-x | ci/macos_xcode_cmake.sh | 1 |
10 files changed, 44 insertions, 56 deletions
diff --git a/absl/abseil.podspec.gen.py b/absl/abseil.podspec.gen.py index 2bf153c..6aefb79 100755 --- a/absl/abseil.podspec.gen.py +++ b/absl/abseil.podspec.gen.py @@ -46,18 +46,6 @@ Pod::Spec.new do |s| s.watchos.deployment_target = '2.0' """ -# Limited platforms that abseil supports. -# This is mainly because of sigaltstack unavailable on watchOS. -LIMITED_SUPPORT_PLATFORMS = [ - "ios.deployment_target = '7.0'", - "osx.deployment_target = '10.9'", -] - -# Custom specification per rule. -CUSTOM_SPEC_MAP = { - "//absl/debugging:failure_signal_handler": LIMITED_SUPPORT_PLATFORMS, -} - # Rule object representing the rule of Bazel BUILD. Rule = collections.namedtuple( "Rule", "type name package srcs hdrs textual_hdrs deps visibility testonly") @@ -200,12 +188,6 @@ def write_podspec_rule(f, rule, depth): name = get_spec_name(dep.replace(":", "/")) f.write("{indent}{var}.dependency '{dep}'\n".format( indent=indent, var=spec_var, dep=name)) - # Writes custom specification. - custom_spec = CUSTOM_SPEC_MAP.get(rule.package + ":" + rule.name) - if custom_spec: - for spec in custom_spec: - f.write("{indent}{var}.{spec}\n".format( - indent=indent, var=spec_var, spec=spec)) def write_indented_list(f, leading, values): diff --git a/absl/base/config.h b/absl/base/config.h index eac5d26..ee99f94 100644 --- a/absl/base/config.h +++ b/absl/base/config.h @@ -316,13 +316,19 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' || #error ABSL_HAVE_EXCEPTIONS cannot be directly set. #elif defined(__clang__) -// TODO(calabrese) -// Switch to using __cpp_exceptions when we no longer support versions < 3.6. -// For details on this check, see: -// http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro + +#if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6) +// Clang >= 3.6 +#if __has_feature(cxx_exceptions) +#define ABSL_HAVE_EXCEPTIONS 1 +#endif // __has_feature(cxx_exceptions) +#else +// Clang < 3.6 +// http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro #if defined(__EXCEPTIONS) && __has_feature(cxx_exceptions) #define ABSL_HAVE_EXCEPTIONS 1 #endif // defined(__EXCEPTIONS) && __has_feature(cxx_exceptions) +#endif // __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6) // Handle remaining special cases and default to exceptions being supported. #elif !(defined(__GNUC__) && (__GNUC__ < 5) && !defined(__EXCEPTIONS)) && \ diff --git a/absl/container/node_hash_set.h b/absl/container/node_hash_set.h index 0e2dee5..ad54b6d 100644 --- a/absl/container/node_hash_set.h +++ b/absl/container/node_hash_set.h @@ -77,7 +77,7 @@ struct NodeHashSetPolicy; // // // Create a node hash set of three strings // absl::node_hash_map<std::string, std::string> ducks = -// {"huey", "dewey"}, "louie"}; +// {"huey", "dewey", "louie"}; // // // Insert a new element into the node hash map // ducks.insert("donald"}; @@ -111,7 +111,7 @@ class node_hash_set // * Initializer List constructor // // absl::node_hash_set<std::string> set2 = - // {{"huey"}, {"dewey"}, {"louie"},}; + // {{"huey"}, {"dewey"}, {"louie"}}; // // * Copy constructor // diff --git a/absl/debugging/failure_signal_handler.cc b/absl/debugging/failure_signal_handler.cc index 470d676..cd141ec 100644 --- a/absl/debugging/failure_signal_handler.cc +++ b/absl/debugging/failure_signal_handler.cc @@ -24,6 +24,10 @@ #include <unistd.h> #endif +#ifdef __APPLE__ +#include <TargetConditionals.h> +#endif + #ifdef ABSL_HAVE_MMAP #include <sys/mman.h> #endif @@ -44,6 +48,11 @@ #ifndef _WIN32 #define ABSL_HAVE_SIGACTION +// Apple WatchOS and TVOS don't allow sigaltstack +#if !(defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) && \ + !(defined(TARGET_OS_TV) && TARGET_OS_TV) +#define ABSL_HAVE_SIGALTSTACK +#endif #endif namespace absl { @@ -117,7 +126,7 @@ const char* FailureSignalToString(int signo) { } // namespace debugging_internal -#ifndef _WIN32 +#ifdef ABSL_HAVE_SIGALTSTACK static bool SetupAlternateStackOnce() { #if defined(__wasm__) || defined (__asjms__) @@ -169,7 +178,7 @@ static bool SetupAlternateStackOnce() { // Returns the appropriate flag for sig_action.sa_flags // if the system supports using an alternate stack. static int MaybeSetupAlternateStack() { -#ifndef _WIN32 +#ifdef ABSL_HAVE_SIGALTSTACK ABSL_ATTRIBUTE_UNUSED static const bool kOnce = SetupAlternateStackOnce(); return SA_ONSTACK; #else diff --git a/absl/flags/BUILD.bazel b/absl/flags/BUILD.bazel index d2ca5c6..cdb4e7e 100644 --- a/absl/flags/BUILD.bazel +++ b/absl/flags/BUILD.bazel @@ -41,6 +41,7 @@ cc_library( ":config", ":handle", ":registry", + "//absl/base", "//absl/base:config", "//absl/base:core_headers", "//absl/memory", diff --git a/absl/flags/CMakeLists.txt b/absl/flags/CMakeLists.txt index 20e6682..1d25f0d 100644 --- a/absl/flags/CMakeLists.txt +++ b/absl/flags/CMakeLists.txt @@ -27,6 +27,7 @@ absl_cc_library( LINKOPTS ${ABSL_DEFAULT_LINKOPTS} DEPS + absl::base absl::config absl::flags_config absl::flags_handle diff --git a/absl/flags/internal/flag.cc b/absl/flags/internal/flag.cc index ba70da9..721e411 100644 --- a/absl/flags/internal/flag.cc +++ b/absl/flags/internal/flag.cc @@ -80,41 +80,22 @@ class MutexRelock { absl::Mutex* mu_; }; -// This global lock guards the initialization and destruction of data_guard_, -// which is used to guard the other Flag data. -ABSL_CONST_INIT static absl::Mutex flag_mutex_lifetime_guard(absl::kConstInit); - } // namespace void FlagImpl::Init() { - { - absl::MutexLock lock(&flag_mutex_lifetime_guard); - - // Must initialize data guard for this flag. - if (!is_data_guard_inited_) { - new (&data_guard_) absl::Mutex; - is_data_guard_inited_ = true; - } - } + new (&data_guard_) absl::Mutex; absl::MutexLock lock(reinterpret_cast<absl::Mutex*>(&data_guard_)); - if (value_.dynamic != nullptr) { - inited_.store(true, std::memory_order_release); - } else { - // Need to initialize cur field. - value_.dynamic = MakeInitValue().release(); - StoreAtomic(); - inited_.store(true, std::memory_order_release); - } + value_.dynamic = MakeInitValue().release(); + StoreAtomic(); } // Ensures that the lazily initialized data is initialized, // and returns pointer to the mutex guarding flags data. absl::Mutex* FlagImpl::DataGuard() const { - if (ABSL_PREDICT_FALSE(!inited_.load(std::memory_order_acquire))) { - const_cast<FlagImpl*>(this)->Init(); - } + absl::call_once(const_cast<FlagImpl*>(this)->init_control_, &FlagImpl::Init, + const_cast<FlagImpl*>(this)); // data_guard_ is initialized. return reinterpret_cast<absl::Mutex*>(&data_guard_); diff --git a/absl/flags/internal/flag.h b/absl/flags/internal/flag.h index ef30a22..b426ccb 100644 --- a/absl/flags/internal/flag.h +++ b/absl/flags/internal/flag.h @@ -24,6 +24,7 @@ #include <string> #include <type_traits> +#include "absl/base/call_once.h" #include "absl/base/config.h" #include "absl/base/thread_annotations.h" #include "absl/flags/config.h" @@ -281,10 +282,8 @@ class FlagImpl { help_(help.source), help_source_kind_(static_cast<uint8_t>(help.kind)), def_kind_(static_cast<uint8_t>(FlagDefaultKind::kGenFunc)), - is_data_guard_inited_(false), modified_(false), on_command_line_(false), - inited_(false), counter_(0), callback_(nullptr), default_src_(default_value_gen), @@ -406,20 +405,28 @@ class FlagImpl { // Indicates if help message was supplied as literal or generator func. const uint8_t help_source_kind_ : 1; + // ------------------------------------------------------------------------ + // The bytes containing the const bitfields must not be shared with bytes + // containing the mutable bitfields. + // ------------------------------------------------------------------------ + + // Unique tag for absl::call_once call to initialize this flag. + // + // The placement of this variable between the immutable and mutable bitfields + // is important as prevents them from occupying the same byte. If you remove + // this variable, make sure to maintain this property. + absl::once_flag init_control_; + // Mutable flag's state (guarded by `data_guard_`). // If def_kind_ == kDynamicValue, default_src_ holds a dynamically allocated // value. uint8_t def_kind_ : 1 ABSL_GUARDED_BY(*DataGuard()); - // Protects against multiple concurrent constructions of `data_guard_`. - bool is_data_guard_inited_ : 1; // Has this flag's value been modified? bool modified_ : 1 ABSL_GUARDED_BY(*DataGuard()); // Has this flag been specified on command line. bool on_command_line_ : 1 ABSL_GUARDED_BY(*DataGuard()); - // Indicates that the flag state is initialized. - std::atomic<bool> inited_; // Mutation counter int64_t counter_ ABSL_GUARDED_BY(*DataGuard()); // Optional flag's callback and absl::Mutex to guard the invocations. diff --git a/ci/macos_xcode_cmake.sh b/ci/macos_xcode_cmake.sh index 75b0f2d..a1f4a85 100755 --- a/ci/macos_xcode_cmake.sh +++ b/ci/macos_xcode_cmake.sh @@ -36,6 +36,7 @@ for compilation_mode in ${ABSL_CMAKE_BUILD_TYPES}; do time cmake ${ABSEIL_ROOT} \ -GXcode \ -DCMAKE_BUILD_TYPE=${compilation_mode} \ + -DCMAKE_CXX_STANDARD=11 \ -DABSL_USE_GOOGLETEST_HEAD=ON \ -DABSL_RUN_TESTS=ON time cmake --build . |