Squashed 'third_party/abseil/' changes from ddf8e52a2..384af0e91
384af0e91 Export of internal Abseil changes
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9f8b87b71 Add missing word 'library' in the 'status' description (#868)
e2b1bab19 Export of internal Abseil changes
1bae23e32 Export of internal Abseil changes
6df644c56 Include the status library into the main README. (#863)
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6b03bf543 fix build dll (#797)
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e96d49687 Export of internal Abseil changes
731852f10 Fix stacktrace on aarch64 architecture. Fixes #805 (#827)
2e5f2bcfd moved deleted functions to public for better compiler errors. (#828)
e9e9b9fc7 Export of internal Abseil changes
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e493d6acb fix compile fails with asan and -Wredundant-decls (#801)
e63a5a610 Export of internal Abseil changes
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40fdb59d3 btree: fix sign-compare warnings (#800)
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9927a0989 Export of internal Abseil changes
7680a5f8e Added missing asserts for seq.index() < capacity_ and unified their usage based on has_element(). (#781)
d3614de61 Export of internal Abseil changes
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41a6263fd Export of internal Abseil changes
3c2bed2e7 Export of internal Abseil changes
ea8a689cf fix build on P9 (#739)
672d9e0ae Export of internal Abseil changes
f624790b7 Export of internal Abseil changes
55c04eb92 Export of internal Abseil changes
302b250e1 Disable pthread for standalone wasm build support (#721)
61d8bc057 Merge branch 'master' of https://github.com/abseil/abseil-cpp into master
4b5b25a28 cmake: remove unneeded enable_testing() cmd (#736)
63f2c695e cmake: flag conformance_testing as TESTONLY (#737)
d5269a8b6 Export of internal Abseil changes
23f1f9cf6 Typo in comment (#733)
259301a52 Fix CMake path for INSTALL_INCLUDEDIR (#723)
dc464c1dc Allow overriding Abseil IDE folder (#724)
bf655de09 Export of internal Abseil changes
38db52adb Export of internal Abseil changes
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1d31b5c36 Export of internal Abseil changes
da3a87690 Export of internal Abseil changes
8faf20461 Exclude empty directories (#697)
2069dc796 Export of internal Abseil changes
4832bf6bf Added a BUILD file in root to expose license. (#695)
af8f994af Export of internal Abseil changes
33caf1097 Export of internal Abseil changes
cf1a02e2d Export of internal Abseil changes
768eb2ca2 Export of internal Abseil changes
3f347c462 Fix build on riscv32 (#675)
62cf6a704 Export of internal Abseil changes
d118d4bb1 Export of internal Abseil changes
f2bc9d11e Fix public target name of the random library (#684)
0fecf0e63 Export of internal Abseil changes
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c45d1c09d Export of internal Abseil changes
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bd317cae3 Export of internal Abseil changes
b11574465 fix MSVC warning 4245: conversion signed => unsigned during initialization (#678)
d85783fd0 Export of internal Abseil changes
a1d668990 Export of internal Abseil changes
ca9856cab Export of internal Abseil changes
6e18c7115 Export of internal Abseil changes
3f48ce1c4 init (#673)
cde2e2410 Export of internal Abseil changes
68494aae9 Fix CMake Threads dependency issue
902909a43 Export of internal Abseil changes
cb52b05ea Export of internal Abseil changes
1a02b7a20 Use "-lrt" instead of the resolved find_library result when linking librt (#665)
df60c82df Export of internal Abseil changes
b35973e3e Export of internal Abseil changes
db5773a72 Export of internal Abseil changes
71079e42c Export of internal Abseil changes
2946ac0de Use base_internal::AtomicHook instead of std::atomic (#661)
567bee2f7 Fix ABSL_RANDOM_RANDEN_COPTS setting on FreeBSD (#664)
bf6166a63 Export of internal Abseil changes
111260963 Export of internal Abseil changes
73ea9a957 Export of internal Abseil changes
c01b9916e Add option to use an externally provided GoogleTest target (for usage of abseil as add_subdirectory target) (#647)
d43b7997c Export of internal Abseil changes
62f05b1f5 Export of internal Abseil changes
fba8a316c Export of internal Abseil changes
79e0dc115 Export of internal Abseil changes
132d791b4 bazel: Add missing load statements for cc_binary (#645)
518f17501 Export of internal Abseil changes
092ed9793 Export of internal Abseil changes
2d2a8aea2 Export of internal Abseil changes
7853a7586 Export of internal Abseil changes
c6954897f Export of internal Abseil changes
b92f35f65 Fix CompressedTuple move constructor on MSVC (#637)
a877af1f2 Export of internal Abseil changes
d936052d3 Export of internal Abseil changes
238b9a59c Skip the .exe suffix in the helpshort filter on Windows (#629)
417ea99cb UWP doesn't allow reading regkeys (#594)
40a0e58eb Export of internal Abseil changes
cf3a1998e Export of internal Abseil changes
b19ba9676 Export of internal Abseil changes
06f0e767d BuildBreak: UWP apps can't call GetModuleHandle (#596)
bcefbdcdf Export of internal Abseil changes
0033c9ea9 Fix build on FreeBSD/powerpc (#616)
0d5ce2797 Export of internal Abseil changes
b69c7d880 Export of internal Abseil changes
2a5633fc0 Merge "Export of internal Abseil changes"
f9b3d6e49 Add RISCV support to GetProgramCounter() (#621)
914ff4451 Export of internal Abseil changes
0232c87f2 Add missing ABSL_HAVE_VDSO_SUPPORT conditional (#622)
3c8141051 Export of internal Abseil changes
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08a7e7bf9 Export of internal Abseil changes
36bcd9599 Fix pointer format specifier in documentation (#614)
0f86336b6 Export of internal Abseil changes
c512f118d Export of internal Abseil changes
37dd2562e Export of internal Abseil changes
444277026 fix: Add support for more ARM processors detection (#608)
159bf2bf6 Export of internal Abseil changes
a2e6adecc Use https links. (#586)
564001ae5 Export of internal Abseil changes
b3aaac8a3 Export of internal Abseil changes
63ee2f887 Export of internal Abseil changes
a048203a8 Export of internal Abseil changes
1de016636 Export of internal Abseil changes
ad904b6cd Export of internal Abseil changes
7bd1935dc cmake: Fix x86_64 check on Windows for random copts (#518)
292351391 Export of internal Abseil changes
bf86cfe16 Export of internal Abseil changes
12bc53e03 Export of internal Abseil changes
1e39f8626 Export of internal Abseil changes
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bcaae6009 Export of internal Abseil changes
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2103fd9ac Export of internal Abseil changes
3df7b52a6 Export of internal Abseil changes
fa8c75182 Export of internal Abseil changes
85092b4b6 Fix Conan builds (#400)
e96ae2203 Export of internal Abseil changes
20de2db74 Export of internal Abseil changes
846e5dbed Export of internal Abseil changes
83880e3d8 Merge branch 'master' of https://github.com/abseil/abseil-cpp
8207907f4 Export of internal Abseil changes
39d68a422 docs: fix typo (#397)
078b89b3c Export of internal Abseil changes
19b021cb3 Export of internal Abseil changes
ecc0033b5 Always enable proper symbolize implementation on Windows (#257)
2796d500a Export of internal Abseil changes
e4c8d0eb8 Export of internal Abseil changes
a15364ce4 Export of internal Abseil changes
ab3552a18 Export of internal Abseil changes
e9f9000c7 Fix ABSL_WAITER_MODE detection for mingw (#342)
abea769b5 Fix ABSL_HAVE_ALARM check on mingw (#341)
25597bdfc Export of internal Abseil changes
aad33fefa Export of internal Abseil changes
8fe7214fe Export of internal Abseil changes
debac94cf Export of internal Abseil changes
882b3501a Fix spelling errors (#384)
502efe6d7 Export of internal Abseil changes
ccdd1d57b Export of internal Abseil changes
Change-Id: I59864a0053f6e03d88cc9d5e2a92757039a05484
git-subtree-dir: third_party/abseil
git-subtree-split: 384af0e9141283172e2bff3210dae79fb7130d9c
diff --git a/absl/flags/internal/commandlineflag.h b/absl/flags/internal/commandlineflag.h
index 284286b..ebfe81b 100644
--- a/absl/flags/internal/commandlineflag.h
+++ b/absl/flags/internal/commandlineflag.h
@@ -16,29 +16,19 @@
#ifndef ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
#define ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
-#include <atomic>
-
-#include "absl/base/macros.h"
-#include "absl/flags/marshalling.h"
-#include "absl/synchronization/mutex.h"
-#include "absl/types/optional.h"
+#include "absl/base/config.h"
+#include "absl/base/internal/fast_type_id.h"
namespace absl {
+ABSL_NAMESPACE_BEGIN
namespace flags_internal {
-// Type-specific operations, eg., parsing, copying, etc. are provided
-// by function specific to that type with a signature matching FlagOpFn.
-enum FlagOp {
- kDelete,
- kClone,
- kCopy,
- kCopyConstruct,
- kSizeof,
- kParse,
- kUnparse
-};
-using FlagOpFn = void* (*)(FlagOp, const void*, void*);
-using FlagMarshallingOpFn = void* (*)(FlagOp, const void*, void*, void*);
+// An alias for flag fast type id. This value identifies the flag value type
+// similarly to typeid(T), without relying on RTTI being available. In most
+// cases this id is enough to uniquely identify the flag's value type. In a few
+// cases we'll have to resort to using actual RTTI implementation if it is
+// available.
+using FlagFastTypeId = absl::base_internal::FastTypeIdType;
// Options that control SetCommandLineOptionWithMode.
enum FlagSettingMode {
@@ -53,7 +43,7 @@
SET_FLAGS_DEFAULT
};
-// Options that control SetFromString: Source of a value.
+// Options that control ParseFrom: Source of a value.
enum ValueSource {
// Flag is being set by value specified on a command line.
kCommandLine,
@@ -61,309 +51,18 @@
kProgrammaticChange,
};
-// Signature for the help generation function used as an argument for the
-// absl::Flag constructor.
-using HelpGenFunc = std::string (*)();
-
-// Signature for the function generating the initial flag value based (usually
-// based on default value supplied in flag's definition)
-using InitialValGenFunc = void* (*)();
-
-extern const char kStrippedFlagHelp[];
-
-// The per-type function
-template <typename T>
-void* FlagOps(FlagOp op, const void* v1, void* v2) {
- switch (op) {
- case kDelete:
- delete static_cast<const T*>(v1);
- return nullptr;
- case kClone:
- return new T(*static_cast<const T*>(v1));
- case kCopy:
- *static_cast<T*>(v2) = *static_cast<const T*>(v1);
- return nullptr;
- case kCopyConstruct:
- new (v2) T(*static_cast<const T*>(v1));
- return nullptr;
- case kSizeof:
- return reinterpret_cast<void*>(sizeof(T));
- default:
- return nullptr;
- }
-}
-
-template <typename T>
-void* FlagMarshallingOps(FlagOp op, const void* v1, void* v2, void* v3) {
- switch (op) {
- case kParse: {
- // initialize the temporary instance of type T based on current value in
- // destination (which is going to be flag's default value).
- T temp(*static_cast<T*>(v2));
- if (!absl::ParseFlag<T>(*static_cast<const absl::string_view*>(v1), &temp,
- static_cast<std::string*>(v3))) {
- return nullptr;
- }
- *static_cast<T*>(v2) = std::move(temp);
- return v2;
- }
- case kUnparse:
- *static_cast<std::string*>(v2) =
- absl::UnparseFlag<T>(*static_cast<const T*>(v1));
- return nullptr;
- default:
- return nullptr;
- }
-}
-
-// Functions that invoke flag-type-specific operations.
-inline void Delete(FlagOpFn op, const void* obj) {
- op(flags_internal::kDelete, obj, nullptr);
-}
-
-inline void* Clone(FlagOpFn op, const void* obj) {
- return op(flags_internal::kClone, obj, nullptr);
-}
-
-inline void Copy(FlagOpFn op, const void* src, void* dst) {
- op(flags_internal::kCopy, src, dst);
-}
-
-inline void CopyConstruct(FlagOpFn op, const void* src, void* dst) {
- op(flags_internal::kCopyConstruct, src, dst);
-}
-
-inline bool Parse(FlagMarshallingOpFn op, absl::string_view text, void* dst,
- std::string* error) {
- return op(flags_internal::kParse, &text, dst, error) != nullptr;
-}
-
-inline std::string Unparse(FlagMarshallingOpFn op, const void* val) {
- std::string result;
- op(flags_internal::kUnparse, val, &result, nullptr);
- return result;
-}
-
-inline size_t Sizeof(FlagOpFn op) {
- // This sequence of casts reverses the sequence from base::internal::FlagOps()
- return static_cast<size_t>(reinterpret_cast<intptr_t>(
- op(flags_internal::kSizeof, nullptr, nullptr)));
-}
-
-// The following struct contains the locks in a CommandLineFlag struct.
-// They are in a separate struct that is lazily allocated to avoid problems
-// with static initialization and to avoid multiple allocations.
-struct CommandLineFlagLocks {
- absl::Mutex primary_mu; // protects several fields in CommandLineFlag
- absl::Mutex callback_mu; // used to serialize callbacks
-};
-
-// Holds either a pointer to help text or a function which produces it. This is
-// needed for supporting both static initialization of Flags while supporting
-// the legacy registration framework. We can't use absl::variant<const char*,
-// const char*(*)()> since anybody passing 0 or nullptr in to a CommandLineFlag
-// would find an ambiguity.
-class HelpText {
+// Handle to FlagState objects. Specific flag state objects will restore state
+// of a flag produced this flag state from method CommandLineFlag::SaveState().
+class FlagStateInterface {
public:
- static constexpr HelpText FromFunctionPointer(const HelpGenFunc fn) {
- return HelpText(fn, nullptr);
- }
- static constexpr HelpText FromStaticCString(const char* msg) {
- return HelpText(nullptr, msg);
- }
+ virtual ~FlagStateInterface();
- std::string GetHelpText() const;
-
- HelpText() = delete;
- HelpText(const HelpText&) = default;
- HelpText(HelpText&&) = default;
-
- private:
- explicit constexpr HelpText(const HelpGenFunc fn, const char* msg)
- : help_function_(fn), help_message_(msg) {}
-
- HelpGenFunc help_function_;
- const char* help_message_;
+ // Restores the flag originated this object to the saved state.
+ virtual void Restore() const = 0;
};
-// Holds all information for a flag.
-class CommandLineFlag {
- public:
- constexpr CommandLineFlag(
- const char* name, HelpText help_text, const char* filename,
- const flags_internal::FlagOpFn op,
- const flags_internal::FlagMarshallingOpFn marshalling_op,
- const flags_internal::InitialValGenFunc initial_value_gen, void* def,
- void* cur)
- : name_(name),
- help_(help_text),
- filename_(filename),
- op_(op),
- marshalling_op_(marshalling_op),
- make_init_value_(initial_value_gen),
- inited_(false),
- modified_(false),
- on_command_line_(false),
- def_(def),
- cur_(cur),
- counter_(0),
- locks_(nullptr) {}
-
- // Virtual destructor
- virtual void Destroy() const = 0;
-
- // Not copyable/assignable.
- CommandLineFlag(const CommandLineFlag&) = delete;
- CommandLineFlag& operator=(const CommandLineFlag&) = delete;
-
- // Access methods.
-
- // Returns true iff this object corresponds to retired flag
- virtual bool IsRetired() const { return false; }
- // Returns true iff this is a handle to an Abseil Flag.
- virtual bool IsAbseilFlag() const { return true; }
-
- absl::string_view Name() const { return name_; }
- std::string Help() const { return help_.GetHelpText(); }
- bool IsModified() const;
- void SetModified(bool is_modified);
- bool IsSpecifiedOnCommandLine() const;
-
- absl::string_view Typename() const;
- std::string Filename() const;
- std::string DefaultValue() const;
- std::string CurrentValue() const;
-
- // Interface to store the value in atomic if one used. This is short term
- // interface. To be reworked once cur_ is moved.
- virtual void StoreAtomic() {}
-
- // Interfaces to operate on validators.
- virtual bool HasValidatorFn() const { return false; }
- virtual bool InvokeValidator(const void* /*value*/) const { return true; }
- // Invoke the flag validators for old flags.
- // TODO(rogeeff): implement proper validators for Abseil Flags
- bool ValidateDefaultValue() const;
- bool ValidateInputValue(absl::string_view value) const;
-
- // Return true iff flag has type T.
- template <typename T>
- inline bool IsOfType() const {
- return op_ == &flags_internal::FlagOps<T>;
- }
-
- // Attempts to retrieve the flag value. Returns value on success,
- // absl::nullopt otherwise.
- template <typename T>
- absl::optional<T> Get() const {
- if (IsRetired() || flags_internal::FlagOps<T> != op_) return absl::nullopt;
-
- T res;
- Read(&res, flags_internal::FlagOps<T>);
-
- return res;
- }
-
- // Interfaces to overate on callbacks.
- virtual void InvokeCallback() {}
-
- // Sets the value of the flag based on specified std::string `value`. If the flag
- // was successfully set to new value, it returns true. Otherwise, sets `error`
- // to indicate the error, leaves the flag unchanged, and returns false. There
- // are three ways to set the flag's value:
- // * Update the current flag value
- // * Update the flag's default value
- // * Update the current flag value if it was never set before
- // The mode is selected based on `set_mode` parameter.
- bool SetFromString(absl::string_view value,
- flags_internal::FlagSettingMode set_mode,
- flags_internal::ValueSource source, std::string* error);
-
- void CheckDefaultValueParsingRoundtrip() const;
-
- // Constant configuration for a particular flag.
- protected:
- ~CommandLineFlag() = default;
-
- const char* const name_;
- const HelpText help_;
- const char* const filename_;
-
- const FlagOpFn op_; // Type-specific handler
- const FlagMarshallingOpFn marshalling_op_; // Marshalling ops handler
- const InitialValGenFunc make_init_value_; // Makes initial value for the flag
- std::atomic<bool> inited_; // fields have been lazily initialized
-
- // Mutable state (guarded by locks_->primary_mu).
- bool modified_; // Has flag value been modified?
- bool on_command_line_; // Specified on command line.
- void* def_; // Lazily initialized pointer to default value
- void* cur_; // Lazily initialized pointer to current value
- int64_t counter_; // Mutation counter
-
- // Lazily initialized mutexes for this flag value. We cannot inline a
- // SpinLock or Mutex here because those have non-constexpr constructors and
- // so would prevent constant initialization of this type.
- // TODO(rogeeff): fix it once Mutex has constexpr constructor
- struct CommandLineFlagLocks* locks_; // locks, laziliy allocated.
-
- // Ensure that the lazily initialized fields of *flag have been initialized,
- // and return the lock which should be locked when flag's state is mutated.
- absl::Mutex* InitFlagIfNecessary() const ABSL_LOCK_RETURNED(locks_->primary_mu);
-
- // copy construct new value of flag's type in a memory referenced by dst
- // based on current flag's value
- void Read(void* dst, const flags_internal::FlagOpFn dst_op) const;
- // updates flag's value to *src (locked)
- void Write(const void* src, const flags_internal::FlagOpFn src_op);
-
- friend class FlagRegistry;
- friend class FlagPtrMap;
- friend class FlagSaverImpl;
- friend bool TryParseLocked(CommandLineFlag* flag, void* dst,
- absl::string_view value, std::string* err);
- friend absl::Mutex* InitFlag(CommandLineFlag* flag);
-
- // This is a short term, until we completely rework persistent state
- // storage API.
- virtual void* GetValidator() const { return nullptr; }
- virtual bool SetValidator(void*) { return false; }
-};
-
-// Update any copy of the flag value that is stored in an atomic word.
-// In addition if flag has a mutation callback this function invokes it. While
-// callback is being invoked the primary flag's mutex is unlocked and it is
-// re-locked back after call to callback is completed. Callback invocation is
-// guarded by flag's secondary mutex instead which prevents concurrent callback
-// invocation. Note that it is possible for other thread to grab the primary
-// lock and update flag's value at any time during the callback invocation.
-// This is by design. Callback can get a value of the flag if necessary, but it
-// might be different from the value initiated the callback and it also can be
-// different by the time the callback invocation is completed.
-// Requires that *primary_lock be held in exclusive mode; it may be released
-// and reacquired by the implementation.
-void UpdateCopy(CommandLineFlag* flag);
-// Return true iff flag value was changed via direct-access.
-bool ChangedDirectly(CommandLineFlag* flag, const void* a, const void* b);
-
-// This macro is the "source of truth" for the list of supported flag types we
-// expect to perform lock free operations on. Specifically it generates code,
-// a one argument macro operating on a type, supplied as a macro argument, for
-// each type in the list.
-#define ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(A) \
- A(bool) \
- A(short) \
- A(unsigned short) \
- A(int) \
- A(unsigned int) \
- A(long) \
- A(unsigned long) \
- A(long long) \
- A(unsigned long long) \
- A(double) \
- A(float)
-
} // namespace flags_internal
+ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_