399 lines
16 KiB
C
399 lines
16 KiB
C
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// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file defines dynamic annotations for use with dynamic analysis tool
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// such as valgrind, PIN, etc.
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//
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// Dynamic annotation is a source code annotation that affects the generated
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// code (that is, the annotation is not a comment). Each such annotation is
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// attached to a particular instruction and/or to a particular object (address)
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// in the program.
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//
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// The annotations that should be used by users are macros in all upper-case
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// (e.g., ANNOTATE_THREAD_NAME).
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//
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// Actual implementation of these macros may differ depending on the dynamic
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// analysis tool being used.
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//
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// This file supports the following configurations:
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// - Dynamic Annotations enabled (with static thread-safety warnings disabled).
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// In this case, macros expand to functions implemented by Thread Sanitizer,
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// when building with TSan. When not provided an external implementation,
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// dynamic_annotations.cc provides no-op implementations.
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//
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// - Static Clang thread-safety warnings enabled.
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// When building with a Clang compiler that supports thread-safety warnings,
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// a subset of annotations can be statically-checked at compile-time. We
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// expand these macros to static-inline functions that can be analyzed for
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// thread-safety, but afterwards elided when building the final binary.
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//
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// - All annotations are disabled.
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// If neither Dynamic Annotations nor Clang thread-safety warnings are
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// enabled, then all annotation-macros expand to empty.
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#ifndef ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
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#define ABSL_BASE_INTERNAL_DYNAMIC_ANNOTATIONS_H_
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#include <stddef.h>
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#include "absl/base/config.h"
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// -------------------------------------------------------------------------
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// Decide which features are enabled
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#ifndef DYNAMIC_ANNOTATIONS_ENABLED
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#define DYNAMIC_ANNOTATIONS_ENABLED 0
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#endif
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#if defined(__clang__) && !defined(SWIG)
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#define ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED 1
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#endif
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#if DYNAMIC_ANNOTATIONS_ENABLED != 0
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#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 1
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#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 1
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#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 1
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#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
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#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED 1
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#else
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#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 0
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#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 0
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#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 0
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// Clang provides limited support for static thread-safety analysis through a
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// feature called Annotalysis. We configure macro-definitions according to
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// whether Annotalysis support is available. When running in opt-mode, GCC
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// will issue a warning, if these attributes are compiled. Only include them
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// when compiling using Clang.
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// ANNOTALYSIS_ENABLED == 1 when IGNORE_READ_ATTRIBUTE_ENABLED == 1
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#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED \
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defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
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// Read/write annotations are enabled in Annotalysis mode; disabled otherwise.
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#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED \
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ABSL_INTERNAL_ANNOTALYSIS_ENABLED
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#endif
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// Memory annotations are also made available to LLVM's Memory Sanitizer
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#if defined(ABSL_HAVE_MEMORY_SANITIZER) && !defined(__native_client__)
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#define ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED 1
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#endif
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#ifndef ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
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#define ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED 0
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#endif
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#ifdef __cplusplus
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#define ABSL_INTERNAL_BEGIN_EXTERN_C extern "C" {
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#define ABSL_INTERNAL_END_EXTERN_C } // extern "C"
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#define ABSL_INTERNAL_GLOBAL_SCOPED(F) ::F
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#define ABSL_INTERNAL_STATIC_INLINE inline
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#else
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#define ABSL_INTERNAL_BEGIN_EXTERN_C // empty
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#define ABSL_INTERNAL_END_EXTERN_C // empty
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#define ABSL_INTERNAL_GLOBAL_SCOPED(F) F
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#define ABSL_INTERNAL_STATIC_INLINE static inline
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#endif
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// -------------------------------------------------------------------------
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// Define race annotations.
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#if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1
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// -------------------------------------------------------------
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// Annotations that suppress errors. It is usually better to express the
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// program's synchronization using the other annotations, but these can be used
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// when all else fails.
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// Report that we may have a benign race at `pointer`, with size
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// "sizeof(*(pointer))". `pointer` must be a non-void* pointer. Insert at the
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// point where `pointer` has been allocated, preferably close to the point
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// where the race happens. See also ANNOTATE_BENIGN_RACE_STATIC.
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#define ANNOTATE_BENIGN_RACE(pointer, description) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
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(__FILE__, __LINE__, pointer, sizeof(*(pointer)), description)
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// Same as ANNOTATE_BENIGN_RACE(`address`, `description`), but applies to
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// the memory range [`address`, `address`+`size`).
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#define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
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(__FILE__, __LINE__, address, size, description)
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// Enable (`enable`!=0) or disable (`enable`==0) race detection for all threads.
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// This annotation could be useful if you want to skip expensive race analysis
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// during some period of program execution, e.g. during initialization.
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#define ANNOTATE_ENABLE_RACE_DETECTION(enable) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateEnableRaceDetection) \
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(__FILE__, __LINE__, enable)
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// -------------------------------------------------------------
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// Annotations useful for debugging.
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// Report the current thread `name` to a race detector.
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#define ANNOTATE_THREAD_NAME(name) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateThreadName)(__FILE__, __LINE__, name)
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// -------------------------------------------------------------
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// Annotations useful when implementing locks. They are not normally needed by
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// modules that merely use locks. The `lock` argument is a pointer to the lock
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// object.
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// Report that a lock has been created at address `lock`.
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#define ANNOTATE_RWLOCK_CREATE(lock) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreate)(__FILE__, __LINE__, lock)
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// Report that a linker initialized lock has been created at address `lock`.
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#ifdef ABSL_HAVE_THREAD_SANITIZER
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#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreateStatic) \
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(__FILE__, __LINE__, lock)
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#else
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#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) ANNOTATE_RWLOCK_CREATE(lock)
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#endif
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// Report that the lock at address `lock` is about to be destroyed.
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#define ANNOTATE_RWLOCK_DESTROY(lock) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockDestroy)(__FILE__, __LINE__, lock)
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// Report that the lock at address `lock` has been acquired.
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// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
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#define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockAcquired) \
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(__FILE__, __LINE__, lock, is_w)
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// Report that the lock at address `lock` is about to be released.
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// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
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#define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockReleased) \
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(__FILE__, __LINE__, lock, is_w)
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// Apply ANNOTATE_BENIGN_RACE_SIZED to a static variable `static_var`.
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#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) \
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namespace { \
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class static_var##_annotator { \
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public: \
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static_var##_annotator() { \
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ANNOTATE_BENIGN_RACE_SIZED(&static_var, sizeof(static_var), \
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#static_var ": " description); \
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} \
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}; \
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static static_var##_annotator the##static_var##_annotator; \
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} // namespace
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#else // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 0
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#define ANNOTATE_RWLOCK_CREATE(lock) // empty
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#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) // empty
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#define ANNOTATE_RWLOCK_DESTROY(lock) // empty
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#define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) // empty
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#define ANNOTATE_RWLOCK_RELEASED(lock, is_w) // empty
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#define ANNOTATE_BENIGN_RACE(address, description) // empty
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#define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) // empty
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#define ANNOTATE_THREAD_NAME(name) // empty
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#define ANNOTATE_ENABLE_RACE_DETECTION(enable) // empty
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#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) // empty
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#endif // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
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// -------------------------------------------------------------------------
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// Define memory annotations.
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#if ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED == 1
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#include <sanitizer/msan_interface.h>
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#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
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__msan_unpoison(address, size)
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#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
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__msan_allocated_memory(address, size)
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#else // ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED == 0
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#if DYNAMIC_ANNOTATIONS_ENABLED == 1
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#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
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do { \
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(void)(address); \
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(void)(size); \
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} while (0)
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#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
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do { \
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(void)(address); \
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(void)(size); \
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} while (0)
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#else
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#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) // empty
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#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) // empty
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#endif
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#endif // ABSL_INTERNAL_MEMORY_ANNOTATIONS_ENABLED
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// -------------------------------------------------------------------------
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// Define IGNORE_READS_BEGIN/_END attributes.
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#if defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
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#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE \
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__attribute((exclusive_lock_function("*")))
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#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE \
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__attribute((unlock_function("*")))
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#else // !defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
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#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE // empty
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#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE // empty
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#endif // defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
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// -------------------------------------------------------------------------
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// Define IGNORE_READS_BEGIN/_END annotations.
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#if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1
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// Request the analysis tool to ignore all reads in the current thread until
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// ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey
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// reads, while still checking other reads and all writes.
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// See also ANNOTATE_UNPROTECTED_READ.
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#define ANNOTATE_IGNORE_READS_BEGIN() \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin)(__FILE__, __LINE__)
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// Stop ignoring reads.
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#define ANNOTATE_IGNORE_READS_END() \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd)(__FILE__, __LINE__)
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#elif defined(ABSL_INTERNAL_ANNOTALYSIS_ENABLED)
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// When Annotalysis is enabled without Dynamic Annotations, the use of
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// static-inline functions allows the annotations to be read at compile-time,
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// while still letting the compiler elide the functions from the final build.
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//
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// TODO(delesley) -- The exclusive lock here ignores writes as well, but
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// allows IGNORE_READS_AND_WRITES to work properly.
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#define ANNOTATE_IGNORE_READS_BEGIN() \
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ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsBegin)()
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#define ANNOTATE_IGNORE_READS_END() \
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ABSL_INTERNAL_GLOBAL_SCOPED(AbslInternalAnnotateIgnoreReadsEnd)()
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#else
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#define ANNOTATE_IGNORE_READS_BEGIN() // empty
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#define ANNOTATE_IGNORE_READS_END() // empty
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#endif
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// -------------------------------------------------------------------------
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// Define IGNORE_WRITES_BEGIN/_END annotations.
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#if ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED == 1
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// Similar to ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead.
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#define ANNOTATE_IGNORE_WRITES_BEGIN() \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesBegin)(__FILE__, __LINE__)
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// Stop ignoring writes.
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#define ANNOTATE_IGNORE_WRITES_END() \
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ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesEnd)(__FILE__, __LINE__)
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#else
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#define ANNOTATE_IGNORE_WRITES_BEGIN() // empty
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#define ANNOTATE_IGNORE_WRITES_END() // empty
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#endif
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// -------------------------------------------------------------------------
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// Define the ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more
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// primitive annotations defined above.
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//
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// Instead of doing
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// ANNOTATE_IGNORE_READS_BEGIN();
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// ... = x;
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// ANNOTATE_IGNORE_READS_END();
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// one can use
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// ... = ANNOTATE_UNPROTECTED_READ(x);
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#if defined(ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED)
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||
|
|
// 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)
|
||
|
|
|
||
|
|
// Stop ignoring both reads and writes.
|
||
|
|
#define ANNOTATE_IGNORE_READS_AND_WRITES_END() \
|
||
|
|
do { \
|
||
|
|
ANNOTATE_IGNORE_WRITES_END(); \
|
||
|
|
ANNOTATE_IGNORE_READS_END(); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
// ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads.
|
||
|
|
#define ANNOTATE_UNPROTECTED_READ(x) \
|
||
|
|
absl::base_internal::AnnotateUnprotectedRead(x)
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() // empty
|
||
|
|
#define ANNOTATE_IGNORE_READS_AND_WRITES_END() // empty
|
||
|
|
#define ANNOTATE_UNPROTECTED_READ(x) (x)
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// -------------------------------------------------------------------------
|
||
|
|
// 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) \
|
||
|
|
__sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid)
|
||
|
|
#define 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 // ABSL_HAVE_ADDRESS_SANITIZER
|
||
|
|
|
||
|
|
// -------------------------------------------------------------------------
|
||
|
|
// Undefine the macros intended only for this file.
|
||
|
|
|
||
|
|
#undef ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
|
||
|
|
#undef ABSL_INTERNAL_MEMORY_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_INTERNAL_DYNAMIC_ANNOTATIONS_H_
|