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Diffstat (limited to 'absl/base/dynamic_annotations.h')
| -rw-r--r-- | absl/base/dynamic_annotations.h | 763 |
1 files changed, 428 insertions, 335 deletions
diff --git a/absl/base/dynamic_annotations.h b/absl/base/dynamic_annotations.h index 65a54b44..545f8cbc 100644 --- a/absl/base/dynamic_annotations.h +++ b/absl/base/dynamic_annotations.h @@ -1,389 +1,482 @@ -/* - * 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. - */ -/* This file defines dynamic annotations for use with dynamic analysis - tool such as valgrind, PIN, etc. - - Dynamic annotation is a source code annotation that affects - the generated code (that is, the annotation is not a comment). - Each such annotation is attached to a particular - instruction and/or to a particular object (address) in the program. - - The annotations that should be used by users are macros in all upper-case - (e.g., ANNOTATE_THREAD_NAME). - - Actual implementation of these macros may differ depending on the - dynamic analysis tool being used. - - This file supports the following configurations: - - Dynamic Annotations enabled (with static thread-safety warnings disabled). - In this case, macros expand to functions implemented by Thread Sanitizer, - when building with TSan. When not provided an external implementation, - dynamic_annotations.cc provides no-op implementations. - - - Static Clang thread-safety warnings enabled. - When building with a Clang compiler that supports thread-safety warnings, - a subset of annotations can be statically-checked at compile-time. We - expand these macros to static-inline functions that can be analyzed for - thread-safety, but afterwards elided when building the final binary. - - - All annotations are disabled. - If neither Dynamic Annotations nor Clang thread-safety warnings are - enabled, then all annotation-macros expand to empty. */ +// 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. + +// This file defines dynamic annotations for use with dynamic analysis tool +// such as valgrind, PIN, etc. +// +// Dynamic annotation is a source code annotation that affects the generated +// code (that is, the annotation is not a comment). Each such annotation is +// attached to a particular instruction and/or to a particular object (address) +// in the program. +// +// The annotations that should be used by users are macros in all upper-case +// (e.g., ABSL_ANNOTATE_THREAD_NAME). +// +// Actual implementation of these macros may differ depending on the dynamic +// analysis tool being used. +// +// This file supports the following configurations: +// - Dynamic Annotations enabled (with static thread-safety warnings disabled). +// In this case, macros expand to functions implemented by Thread Sanitizer, +// when building with TSan. When not provided an external implementation, +// dynamic_annotations.cc provides no-op implementations. +// +// - Static Clang thread-safety warnings enabled. +// When building with a Clang compiler that supports thread-safety warnings, +// a subset of annotations can be statically-checked at compile-time. We +// expand these macros to static-inline functions that can be analyzed for +// thread-safety, but afterwards elided when building the final binary. +// +// - All annotations are disabled. +// If neither Dynamic Annotations nor Clang thread-safety warnings are +// enabled, then all annotation-macros expand to empty. #ifndef ABSL_BASE_DYNAMIC_ANNOTATIONS_H_ #define ABSL_BASE_DYNAMIC_ANNOTATIONS_H_ -#ifndef DYNAMIC_ANNOTATIONS_ENABLED -# define DYNAMIC_ANNOTATIONS_ENABLED 0 -#endif +#include <stddef.h> -#if DYNAMIC_ANNOTATIONS_ENABLED != 0 - - /* ------------------------------------------------------------- - Annotations that suppress errors. It is usually better to express the - program's synchronization using the other annotations, but these can - be used when all else fails. */ - - /* Report that we may have a benign race at "pointer", with size - "sizeof(*(pointer))". "pointer" must be a non-void* pointer. Insert at the - point where "pointer" has been allocated, preferably close to the point - where the race happens. See also ANNOTATE_BENIGN_RACE_STATIC. */ - #define ANNOTATE_BENIGN_RACE(pointer, description) \ - AnnotateBenignRaceSized(__FILE__, __LINE__, pointer, \ - sizeof(*(pointer)), description) - - /* Same as ANNOTATE_BENIGN_RACE(address, description), but applies to - the memory range [address, address+size). */ - #define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \ - AnnotateBenignRaceSized(__FILE__, __LINE__, address, size, description) - - /* Enable (enable!=0) or disable (enable==0) race detection for all threads. - This annotation could be useful if you want to skip expensive race analysis - during some period of program execution, e.g. during initialization. */ - #define ANNOTATE_ENABLE_RACE_DETECTION(enable) \ - AnnotateEnableRaceDetection(__FILE__, __LINE__, enable) - - /* ------------------------------------------------------------- - Annotations useful for debugging. */ - - /* Report the current thread name to a race detector. */ - #define ANNOTATE_THREAD_NAME(name) \ - AnnotateThreadName(__FILE__, __LINE__, name) - - /* ------------------------------------------------------------- - Annotations useful when implementing locks. They are not - normally needed by modules that merely use locks. - The "lock" argument is a pointer to the lock object. */ - - /* Report that a lock has been created at address "lock". */ - #define ANNOTATE_RWLOCK_CREATE(lock) \ - AnnotateRWLockCreate(__FILE__, __LINE__, lock) - - /* Report that a linker initialized lock has been created at address "lock". - */ -#ifdef THREAD_SANITIZER - #define ANNOTATE_RWLOCK_CREATE_STATIC(lock) \ - AnnotateRWLockCreateStatic(__FILE__, __LINE__, lock) -#else - #define ANNOTATE_RWLOCK_CREATE_STATIC(lock) ANNOTATE_RWLOCK_CREATE(lock) +#include "absl/base/attributes.h" +#include "absl/base/config.h" +#ifdef __cplusplus +#include "absl/base/macros.h" #endif - /* Report that the lock at address "lock" is about to be destroyed. */ - #define ANNOTATE_RWLOCK_DESTROY(lock) \ - AnnotateRWLockDestroy(__FILE__, __LINE__, lock) +// TODO(rogeeff): Remove after the backward compatibility period. +#include "absl/base/internal/dynamic_annotations.h" // IWYU pragma: export - /* Report that the lock at address "lock" has been acquired. - is_w=1 for writer lock, is_w=0 for reader lock. */ - #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \ - AnnotateRWLockAcquired(__FILE__, __LINE__, lock, is_w) +// ------------------------------------------------------------------------- +// Decide which features are enabled. - /* Report that the lock at address "lock" is about to be released. */ - #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \ - AnnotateRWLockReleased(__FILE__, __LINE__, lock, is_w) +#ifdef ABSL_HAVE_THREAD_SANITIZER -#else /* DYNAMIC_ANNOTATIONS_ENABLED == 0 */ +#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 1 +#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 1 +#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 1 +#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0 +#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED 1 - #define ANNOTATE_RWLOCK_CREATE(lock) /* empty */ - #define ANNOTATE_RWLOCK_CREATE_STATIC(lock) /* empty */ - #define ANNOTATE_RWLOCK_DESTROY(lock) /* empty */ - #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) /* empty */ - #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) /* empty */ - #define ANNOTATE_BENIGN_RACE(address, description) /* empty */ - #define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) /* empty */ - #define ANNOTATE_THREAD_NAME(name) /* empty */ - #define ANNOTATE_ENABLE_RACE_DETECTION(enable) /* empty */ +#else -#endif /* DYNAMIC_ANNOTATIONS_ENABLED */ +#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 0 +#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 0 +#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 0 -/* These annotations are also made available to LLVM's Memory Sanitizer */ -#if DYNAMIC_ANNOTATIONS_ENABLED == 1 || defined(MEMORY_SANITIZER) - #define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \ - AnnotateMemoryIsInitialized(__FILE__, __LINE__, address, size) +// Clang provides limited support for static thread-safety analysis through a +// feature called Annotalysis. We configure macro-definitions according to +// whether Annotalysis support is available. When running in opt-mode, GCC +// will issue a warning, if these attributes are compiled. Only include them +// when compiling using Clang. - #define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \ - AnnotateMemoryIsUninitialized(__FILE__, __LINE__, address, size) +#if defined(__clang__) +#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 1 +#if !defined(SWIG) +#define ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED 1 +#endif #else - #define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) /* empty */ - #define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) /* empty */ -#endif /* DYNAMIC_ANNOTATIONS_ENABLED || MEMORY_SANITIZER */ - -/* TODO(delesley) -- Replace __CLANG_SUPPORT_DYN_ANNOTATION__ with the - appropriate feature ID. */ -#if defined(__clang__) && (!defined(SWIG)) \ - && defined(__CLANG_SUPPORT_DYN_ANNOTATION__) - - #if DYNAMIC_ANNOTATIONS_ENABLED == 0 - #define ANNOTALYSIS_ENABLED - #endif - - /* When running in opt-mode, GCC will issue a warning, if these attributes are - compiled. Only include them when compiling using Clang. */ - #define ATTRIBUTE_IGNORE_READS_BEGIN \ - __attribute((exclusive_lock_function("*"))) - #define ATTRIBUTE_IGNORE_READS_END \ - __attribute((unlock_function("*"))) +#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0 +#endif + +// Read/write annotations are enabled in Annotalysis mode; disabled otherwise. +#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED \ + ABSL_INTERNAL_ANNOTALYSIS_ENABLED + +#endif // ABSL_HAVE_THREAD_SANITIZER + +#ifdef __cplusplus +#define ABSL_INTERNAL_BEGIN_EXTERN_C extern "C" { +#define ABSL_INTERNAL_END_EXTERN_C } // extern "C" +#define ABSL_INTERNAL_GLOBAL_SCOPED(F) ::F +#define ABSL_INTERNAL_STATIC_INLINE inline #else - #define ATTRIBUTE_IGNORE_READS_BEGIN /* empty */ - #define ATTRIBUTE_IGNORE_READS_END /* empty */ -#endif /* defined(__clang__) && ... */ +#define ABSL_INTERNAL_BEGIN_EXTERN_C // empty +#define ABSL_INTERNAL_END_EXTERN_C // empty +#define ABSL_INTERNAL_GLOBAL_SCOPED(F) F +#define ABSL_INTERNAL_STATIC_INLINE static inline +#endif -#if (DYNAMIC_ANNOTATIONS_ENABLED != 0) || defined(ANNOTALYSIS_ENABLED) - #define ANNOTATIONS_ENABLED +// ------------------------------------------------------------------------- +// Define race annotations. + +#if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1 + +// ------------------------------------------------------------- +// Annotations that suppress errors. It is usually better to express the +// program's synchronization using the other annotations, but these can be used +// when all else fails. + +// Report that we may have a benign race at `pointer`, with size +// "sizeof(*(pointer))". `pointer` must be a non-void* pointer. Insert at the +// point where `pointer` has been allocated, preferably close to the point +// where the race happens. See also ABSL_ANNOTATE_BENIGN_RACE_STATIC. +#define ABSL_ANNOTATE_BENIGN_RACE(pointer, description) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \ + (__FILE__, __LINE__, pointer, sizeof(*(pointer)), description) + +// Same as ABSL_ANNOTATE_BENIGN_RACE(`address`, `description`), but applies to +// the memory range [`address`, `address`+`size`). +#define ABSL_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \ + (__FILE__, __LINE__, address, size, description) + +// Enable (`enable`!=0) or disable (`enable`==0) race detection for all threads. +// This annotation could be useful if you want to skip expensive race analysis +// during some period of program execution, e.g. during initialization. +#define ABSL_ANNOTATE_ENABLE_RACE_DETECTION(enable) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateEnableRaceDetection) \ + (__FILE__, __LINE__, enable) + +// ------------------------------------------------------------- +// Annotations useful for debugging. + +// Report the current thread `name` to a race detector. +#define ABSL_ANNOTATE_THREAD_NAME(name) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateThreadName)(__FILE__, __LINE__, name) + +// ------------------------------------------------------------- +// Annotations useful when implementing locks. They are not normally needed by +// modules that merely use locks. The `lock` argument is a pointer to the lock +// object. + +// Report that a lock has been created at address `lock`. +#define ABSL_ANNOTATE_RWLOCK_CREATE(lock) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreate)(__FILE__, __LINE__, lock) + +// Report that a linker initialized lock has been created at address `lock`. +#ifdef ABSL_HAVE_THREAD_SANITIZER +#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreateStatic) \ + (__FILE__, __LINE__, lock) +#else +#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) \ + ABSL_ANNOTATE_RWLOCK_CREATE(lock) #endif -#if (DYNAMIC_ANNOTATIONS_ENABLED != 0) +// Report that the lock at address `lock` is about to be destroyed. +#define ABSL_ANNOTATE_RWLOCK_DESTROY(lock) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockDestroy)(__FILE__, __LINE__, lock) + +// Report that the lock at address `lock` has been acquired. +// `is_w`=1 for writer lock, `is_w`=0 for reader lock. +#define ABSL_ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockAcquired) \ + (__FILE__, __LINE__, lock, is_w) + +// Report that the lock at address `lock` is about to be released. +// `is_w`=1 for writer lock, `is_w`=0 for reader lock. +#define ABSL_ANNOTATE_RWLOCK_RELEASED(lock, is_w) \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockReleased) \ + (__FILE__, __LINE__, lock, is_w) + +// Apply ABSL_ANNOTATE_BENIGN_RACE_SIZED to a static variable `static_var`. +#define ABSL_ANNOTATE_BENIGN_RACE_STATIC(static_var, description) \ + namespace { \ + class static_var##_annotator { \ + public: \ + static_var##_annotator() { \ + ABSL_ANNOTATE_BENIGN_RACE_SIZED(&static_var, sizeof(static_var), \ + #static_var ": " description); \ + } \ + }; \ + static static_var##_annotator the##static_var##_annotator; \ + } // namespace + +// Function prototypes of annotations provided by the compiler-based sanitizer +// implementation. +ABSL_INTERNAL_BEGIN_EXTERN_C +void AnnotateRWLockCreate(const char* file, int line, + const volatile void* lock); +void AnnotateRWLockCreateStatic(const char* file, int line, + const volatile void* lock); +void AnnotateRWLockDestroy(const char* file, int line, + const volatile void* lock); +void AnnotateRWLockAcquired(const char* file, int line, + const volatile void* lock, long is_w); // NOLINT +void AnnotateRWLockReleased(const char* file, int line, + const volatile void* lock, long is_w); // NOLINT +void AnnotateBenignRace(const char* file, int line, + const volatile void* address, const char* description); +void AnnotateBenignRaceSized(const char* file, int line, + const volatile void* address, size_t size, + const char* description); +void AnnotateThreadName(const char* file, int line, const char* name); +void AnnotateEnableRaceDetection(const char* file, int line, int enable); +ABSL_INTERNAL_END_EXTERN_C + +#else // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 0 + +#define ABSL_ANNOTATE_RWLOCK_CREATE(lock) // empty +#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) // empty +#define ABSL_ANNOTATE_RWLOCK_DESTROY(lock) // empty +#define ABSL_ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) // empty +#define ABSL_ANNOTATE_RWLOCK_RELEASED(lock, is_w) // empty +#define ABSL_ANNOTATE_BENIGN_RACE(address, description) // empty +#define ABSL_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) // empty +#define ABSL_ANNOTATE_THREAD_NAME(name) // empty +#define ABSL_ANNOTATE_ENABLE_RACE_DETECTION(enable) // empty +#define ABSL_ANNOTATE_BENIGN_RACE_STATIC(static_var, description) // empty + +#endif // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED + +// ------------------------------------------------------------------------- +// Define memory annotations. + +#ifdef ABSL_HAVE_MEMORY_SANITIZER + +#include <sanitizer/msan_interface.h> + +#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \ + __msan_unpoison(address, size) + +#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \ + __msan_allocated_memory(address, size) + +#else // !defined(ABSL_HAVE_MEMORY_SANITIZER) + +// TODO(rogeeff): remove this branch +#ifdef ABSL_HAVE_THREAD_SANITIZER +#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \ + do { \ + (void)(address); \ + (void)(size); \ + } while (0) +#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \ + do { \ + (void)(address); \ + (void)(size); \ + } while (0) +#else - /* Request the analysis tool to ignore all reads in the current thread - until ANNOTATE_IGNORE_READS_END is called. - Useful to ignore intentional racey reads, while still checking - other reads and all writes. - See also ANNOTATE_UNPROTECTED_READ. */ - #define ANNOTATE_IGNORE_READS_BEGIN() \ - AnnotateIgnoreReadsBegin(__FILE__, __LINE__) +#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) // empty +#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) // empty - /* Stop ignoring reads. */ - #define ANNOTATE_IGNORE_READS_END() \ - AnnotateIgnoreReadsEnd(__FILE__, __LINE__) +#endif + +#endif // ABSL_HAVE_MEMORY_SANITIZER + +// ------------------------------------------------------------------------- +// Define IGNORE_READS_BEGIN/_END attributes. + +#if defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED) + +#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE \ + __attribute((exclusive_lock_function("*"))) +#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE \ + __attribute((unlock_function("*"))) + +#else // !defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED) + +#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE // empty +#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE // empty - /* Similar to ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead. */ - #define ANNOTATE_IGNORE_WRITES_BEGIN() \ - AnnotateIgnoreWritesBegin(__FILE__, __LINE__) +#endif // defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED) - /* Stop ignoring writes. */ - #define ANNOTATE_IGNORE_WRITES_END() \ - AnnotateIgnoreWritesEnd(__FILE__, __LINE__) +// ------------------------------------------------------------------------- +// Define IGNORE_READS_BEGIN/_END annotations. -/* Clang provides limited support for static thread-safety analysis - through a feature called Annotalysis. We configure macro-definitions - according to whether Annotalysis support is available. */ -#elif defined(ANNOTALYSIS_ENABLED) +#if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1 - #define ANNOTATE_IGNORE_READS_BEGIN() \ - StaticAnnotateIgnoreReadsBegin(__FILE__, __LINE__) +// Request the analysis tool to ignore all reads in the current thread until +// ABSL_ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey +// reads, while still checking other reads and all writes. +// See also ABSL_ANNOTATE_UNPROTECTED_READ. +#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin)(__FILE__, __LINE__) - #define ANNOTATE_IGNORE_READS_END() \ - StaticAnnotateIgnoreReadsEnd(__FILE__, __LINE__) +// Stop ignoring reads. +#define ABSL_ANNOTATE_IGNORE_READS_END() \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd)(__FILE__, __LINE__) - #define ANNOTATE_IGNORE_WRITES_BEGIN() \ - StaticAnnotateIgnoreWritesBegin(__FILE__, __LINE__) +// Function prototypes of annotations provided by the compiler-based sanitizer +// implementation. +ABSL_INTERNAL_BEGIN_EXTERN_C +void AnnotateIgnoreReadsBegin(const char* file, int line) + ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE; +void AnnotateIgnoreReadsEnd(const char* file, + int line) ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE; +ABSL_INTERNAL_END_EXTERN_C - #define ANNOTATE_IGNORE_WRITES_END() \ - StaticAnnotateIgnoreWritesEnd(__FILE__, __LINE__) +#elif defined(ABSL_INTERNAL_ANNOTALYSIS_ENABLED) + +// When Annotalysis is enabled without Dynamic Annotations, the use of +// static-inline functions allows the annotations to be read at compile-time, +// while still letting the compiler elide the functions from the final build. +// +// TODO(delesley) -- The exclusive lock here ignores writes as well, but +// allows IGNORE_READS_AND_WRITES to work properly. + +#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \ + ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsBegin)() + +#define ABSL_ANNOTATE_IGNORE_READS_END() \ + ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsEnd)() + +ABSL_INTERNAL_STATIC_INLINE void AbslInternalAnnotateIgnoreReadsBegin() + ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE {} + +ABSL_INTERNAL_STATIC_INLINE void AbslInternalAnnotateIgnoreReadsEnd() + ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE {} #else - #define ANNOTATE_IGNORE_READS_BEGIN() /* empty */ - #define ANNOTATE_IGNORE_READS_END() /* empty */ - #define ANNOTATE_IGNORE_WRITES_BEGIN() /* empty */ - #define ANNOTATE_IGNORE_WRITES_END() /* empty */ + +#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() // empty +#define ABSL_ANNOTATE_IGNORE_READS_END() // empty + #endif -/* Implement the ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more - primitive annotations defined above. */ -#if defined(ANNOTATIONS_ENABLED) +// ------------------------------------------------------------------------- +// Define IGNORE_WRITES_BEGIN/_END annotations. + +#if ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED == 1 - /* Start ignoring all memory accesses (both reads and writes). */ - #define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \ - do { \ - ANNOTATE_IGNORE_READS_BEGIN(); \ - ANNOTATE_IGNORE_WRITES_BEGIN(); \ - }while (0) +// Similar to ABSL_ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead. +#define ABSL_ANNOTATE_IGNORE_WRITES_BEGIN() \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesBegin)(__FILE__, __LINE__) - /* Stop ignoring both reads and writes. */ - #define ANNOTATE_IGNORE_READS_AND_WRITES_END() \ - do { \ - ANNOTATE_IGNORE_WRITES_END(); \ - ANNOTATE_IGNORE_READS_END(); \ - }while (0) +// Stop ignoring writes. +#define ABSL_ANNOTATE_IGNORE_WRITES_END() \ + ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesEnd)(__FILE__, __LINE__) + +// Function prototypes of annotations provided by the compiler-based sanitizer +// implementation. +ABSL_INTERNAL_BEGIN_EXTERN_C +void AnnotateIgnoreWritesBegin(const char* file, int line); +void AnnotateIgnoreWritesEnd(const char* file, int line); +ABSL_INTERNAL_END_EXTERN_C #else - #define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() /* empty */ - #define ANNOTATE_IGNORE_READS_AND_WRITES_END() /* empty */ -#endif -/* Use the macros above rather than using these functions directly. */ -#include <stddef.h> -#ifdef __cplusplus -extern "C" { -#endif -void AnnotateRWLockCreate(const char *file, int line, - const volatile void *lock); -void AnnotateRWLockCreateStatic(const char *file, int line, - const volatile void *lock); -void AnnotateRWLockDestroy(const char *file, int line, - const volatile void *lock); -void AnnotateRWLockAcquired(const char *file, int line, - const volatile void *lock, long is_w); /* NOLINT */ -void AnnotateRWLockReleased(const char *file, int line, - const volatile void *lock, long is_w); /* NOLINT */ -void AnnotateBenignRace(const char *file, int line, - const volatile void *address, - const char *description); -void AnnotateBenignRaceSized(const char *file, int line, - const volatile void *address, - size_t size, - const char *description); -void AnnotateThreadName(const char *file, int line, - const char *name); -void AnnotateEnableRaceDetection(const char *file, int line, int enable); -void AnnotateMemoryIsInitialized(const char *file, int line, - const volatile void *mem, size_t size); -void AnnotateMemoryIsUninitialized(const char *file, int line, - const volatile void *mem, size_t size); - -/* Annotations expand to these functions, when Dynamic Annotations are enabled. - These functions are either implemented as no-op calls, if no Sanitizer is - attached, or provided with externally-linked implementations by a library - like ThreadSanitizer. */ -void AnnotateIgnoreReadsBegin(const char *file, int line) - ATTRIBUTE_IGNORE_READS_BEGIN; -void AnnotateIgnoreReadsEnd(const char *file, int line) - ATTRIBUTE_IGNORE_READS_END; -void AnnotateIgnoreWritesBegin(const char *file, int line); -void AnnotateIgnoreWritesEnd(const char *file, int line); - -#if defined(ANNOTALYSIS_ENABLED) -/* When Annotalysis is enabled without Dynamic Annotations, the use of - static-inline functions allows the annotations to be read at compile-time, - while still letting the compiler elide the functions from the final build. - - TODO(delesley) -- The exclusive lock here ignores writes as well, but - allows IGNORE_READS_AND_WRITES to work properly. */ -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wunused-function" -static inline void StaticAnnotateIgnoreReadsBegin(const char *file, int line) - ATTRIBUTE_IGNORE_READS_BEGIN { (void)file; (void)line; } -static inline void StaticAnnotateIgnoreReadsEnd(const char *file, int line) - ATTRIBUTE_IGNORE_READS_END { (void)file; (void)line; } -static inline void StaticAnnotateIgnoreWritesBegin( - const char *file, int line) { (void)file; (void)line; } -static inline void StaticAnnotateIgnoreWritesEnd( - const char *file, int line) { (void)file; (void)line; } -#pragma GCC diagnostic pop +#define ABSL_ANNOTATE_IGNORE_WRITES_BEGIN() // empty +#define ABSL_ANNOTATE_IGNORE_WRITES_END() // empty + #endif -/* Return non-zero value if running under valgrind. - - If "valgrind.h" is included into dynamic_annotations.cc, - the regular valgrind mechanism will be used. - See http://valgrind.org/docs/manual/manual-core-adv.html about - RUNNING_ON_VALGRIND and other valgrind "client requests". - The file "valgrind.h" may be obtained by doing - svn co svn://svn.valgrind.org/valgrind/trunk/include - - If for some reason you can't use "valgrind.h" or want to fake valgrind, - there are two ways to make this function return non-zero: - - Use environment variable: export RUNNING_ON_VALGRIND=1 - - Make your tool intercept the function RunningOnValgrind() and - change its return value. - */ -int RunningOnValgrind(void); - -/* ValgrindSlowdown returns: - * 1.0, if (RunningOnValgrind() == 0) - * 50.0, if (RunningOnValgrind() != 0 && getenv("VALGRIND_SLOWDOWN") == NULL) - * atof(getenv("VALGRIND_SLOWDOWN")) otherwise - This function can be used to scale timeout values: - EXAMPLE: - for (;;) { - DoExpensiveBackgroundTask(); - SleepForSeconds(5 * ValgrindSlowdown()); - } - */ -double ValgrindSlowdown(void); +// ------------------------------------------------------------------------- +// Define the ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more +// primitive annotations defined above. +// +// Instead of doing +// ABSL_ANNOTATE_IGNORE_READS_BEGIN(); +// ... = x; +// ABSL_ANNOTATE_IGNORE_READS_END(); +// one can use +// ... = ABSL_ANNOTATE_UNPROTECTED_READ(x); + +#if defined(ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED) + +// Start ignoring all memory accesses (both reads and writes). +#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \ + do { \ + ABSL_ANNOTATE_IGNORE_READS_BEGIN(); \ + ABSL_ANNOTATE_IGNORE_WRITES_BEGIN(); \ + } while (0) + +// Stop ignoring both reads and writes. +#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END() \ + do { \ + ABSL_ANNOTATE_IGNORE_WRITES_END(); \ + ABSL_ANNOTATE_IGNORE_READS_END(); \ + } while (0) #ifdef __cplusplus -} -#endif +// ABSL_ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads. +#define ABSL_ANNOTATE_UNPROTECTED_READ(x) \ + absl::base_internal::AnnotateUnprotectedRead(x) -/* ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads. +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace base_internal { - Instead of doing - ANNOTATE_IGNORE_READS_BEGIN(); - ... = x; - ANNOTATE_IGNORE_READS_END(); - one can use - ... = ANNOTATE_UNPROTECTED_READ(x); */ -#if defined(__cplusplus) && defined(ANNOTATIONS_ENABLED) template <typename T> -inline T ANNOTATE_UNPROTECTED_READ(const volatile T &x) { /* NOLINT */ - ANNOTATE_IGNORE_READS_BEGIN(); +inline T AnnotateUnprotectedRead(const volatile T& x) { // NOLINT + ABSL_ANNOTATE_IGNORE_READS_BEGIN(); T res = x; - ANNOTATE_IGNORE_READS_END(); + ABSL_ANNOTATE_IGNORE_READS_END(); return res; - } +} + +} // namespace base_internal +ABSL_NAMESPACE_END +} // namespace absl +#endif + #else - #define ANNOTATE_UNPROTECTED_READ(x) (x) + +#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() // empty +#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END() // empty +#define ABSL_ANNOTATE_UNPROTECTED_READ(x) (x) + +#endif + +#ifdef __cplusplus +#ifdef ABSL_HAVE_THREAD_SANITIZER +ABSL_INTERNAL_BEGIN_EXTERN_C +int RunningOnValgrind(); +double ValgrindSlowdown(); +ABSL_INTERNAL_END_EXTERN_C +#else +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace base_internal { +ABSL_DEPRECATED( + "Don't use this interface. It is misleading and is being deleted.") +ABSL_ATTRIBUTE_ALWAYS_INLINE inline int RunningOnValgrind() { return 0; } +ABSL_DEPRECATED( + "Don't use this interface. It is misleading and is being deleted.") +ABSL_ATTRIBUTE_ALWAYS_INLINE inline double ValgrindSlowdown() { return 1.0; } +} // namespace base_internal +ABSL_NAMESPACE_END +} // namespace absl + +using absl::base_internal::RunningOnValgrind; +using absl::base_internal::ValgrindSlowdown; +#endif #endif -#if DYNAMIC_ANNOTATIONS_ENABLED != 0 && defined(__cplusplus) - /* Apply ANNOTATE_BENIGN_RACE_SIZED to a static variable. */ - #define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) \ - namespace { \ - class static_var ## _annotator { \ - public: \ - static_var ## _annotator() { \ - ANNOTATE_BENIGN_RACE_SIZED(&static_var, \ - sizeof(static_var), \ - # static_var ": " description); \ - } \ - }; \ - static static_var ## _annotator the ## static_var ## _annotator;\ - } // namespace -#else /* DYNAMIC_ANNOTATIONS_ENABLED == 0 */ - #define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) /* empty */ -#endif /* DYNAMIC_ANNOTATIONS_ENABLED */ - -#ifdef ADDRESS_SANITIZER -/* Describe the current state of a contiguous container such as e.g. - * std::vector or std::string. For more details see - * sanitizer/common_interface_defs.h, which is provided by the compiler. */ +// ------------------------------------------------------------------------- +// Address sanitizer annotations + +#ifdef ABSL_HAVE_ADDRESS_SANITIZER +// Describe the current state of a contiguous container such as e.g. +// std::vector or std::string. For more details see +// sanitizer/common_interface_defs.h, which is provided by the compiler. #include <sanitizer/common_interface_defs.h> -#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \ + +#define ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \ __sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid) -#define ADDRESS_SANITIZER_REDZONE(name) \ - struct { char x[8] __attribute__ ((aligned (8))); } name +#define ABSL_ADDRESS_SANITIZER_REDZONE(name) \ + struct { \ + char x[8] __attribute__((aligned(8))); \ + } name + #else -#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) -#define ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "") -#endif // ADDRESS_SANITIZER -/* Undefine the macros intended only in this file. */ -#undef ANNOTALYSIS_ENABLED -#undef ANNOTATIONS_ENABLED -#undef ATTRIBUTE_IGNORE_READS_BEGIN -#undef ATTRIBUTE_IGNORE_READS_END +#define ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) // empty +#define ABSL_ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "") + +#endif // ABSL_HAVE_ADDRESS_SANITIZER + +// ------------------------------------------------------------------------- +// Undefine the macros intended only for this file. + +#undef ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED +#undef ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED +#undef ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED +#undef ABSL_INTERNAL_ANNOTALYSIS_ENABLED +#undef ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED +#undef ABSL_INTERNAL_BEGIN_EXTERN_C +#undef ABSL_INTERNAL_END_EXTERN_C +#undef ABSL_INTERNAL_STATIC_INLINE -#endif /* ABSL_BASE_DYNAMIC_ANNOTATIONS_H_ */ +#endif // ABSL_BASE_DYNAMIC_ANNOTATIONS_H_ |