fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
386 lines
16 KiB
C++
386 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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*/
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/* This file defines dynamic annotations for use with dynamic analysis
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tool such as valgrind, PIN, etc.
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Dynamic annotation is a source code annotation that affects
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the generated code (that is, the annotation is not a comment).
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Each such annotation is attached to a particular
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instruction and/or to a particular object (address) in the program.
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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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Actual implementation of these macros may differ depending on the
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dynamic analysis tool being used.
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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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- 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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- 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_DYNAMIC_ANNOTATIONS_H_
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#define ABSL_BASE_DYNAMIC_ANNOTATIONS_H_
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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 DYNAMIC_ANNOTATIONS_ENABLED != 0
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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
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be used 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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AnnotateBenignRaceSized(__FILE__, __LINE__, pointer, \
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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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AnnotateBenignRaceSized(__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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AnnotateEnableRaceDetection(__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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AnnotateThreadName(__FILE__, __LINE__, name)
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/* -------------------------------------------------------------
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Annotations useful when implementing locks. They are not
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normally needed by modules that merely use locks.
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The "lock" argument is a pointer to the lock 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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AnnotateRWLockCreate(__FILE__, __LINE__, lock)
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/* Report that a linker initialized lock has been created at address "lock".
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*/
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#ifdef THREAD_SANITIZER
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#define ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
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AnnotateRWLockCreateStatic(__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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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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AnnotateRWLockAcquired(__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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#define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \
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AnnotateRWLockReleased(__FILE__, __LINE__, lock, is_w)
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#else /* DYNAMIC_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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#endif /* DYNAMIC_ANNOTATIONS_ENABLED */
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/* These annotations are also made available to LLVM's Memory Sanitizer */
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#if DYNAMIC_ANNOTATIONS_ENABLED == 1 || defined(MEMORY_SANITIZER)
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#define ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
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AnnotateMemoryIsInitialized(__FILE__, __LINE__, address, size)
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#define ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
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AnnotateMemoryIsUninitialized(__FILE__, __LINE__, address, size)
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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 /* DYNAMIC_ANNOTATIONS_ENABLED || MEMORY_SANITIZER */
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#if defined(__clang__) && !defined(SWIG)
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#if DYNAMIC_ANNOTATIONS_ENABLED == 0
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#define ANNOTALYSIS_ENABLED
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#endif
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/* When running in opt-mode, GCC will issue a warning, if these attributes are
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compiled. Only include them when compiling using Clang. */
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#define ATTRIBUTE_IGNORE_READS_BEGIN \
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__attribute((exclusive_lock_function("*")))
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#define ATTRIBUTE_IGNORE_READS_END \
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__attribute((unlock_function("*")))
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#else
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#define ATTRIBUTE_IGNORE_READS_BEGIN /* empty */
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#define ATTRIBUTE_IGNORE_READS_END /* empty */
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#endif /* defined(__clang__) && ... */
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#if (DYNAMIC_ANNOTATIONS_ENABLED != 0) || defined(ANNOTALYSIS_ENABLED)
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#define ANNOTATIONS_ENABLED
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#endif
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#if (DYNAMIC_ANNOTATIONS_ENABLED != 0)
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/* Request the analysis tool to ignore all reads in the current thread
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until ANNOTATE_IGNORE_READS_END is called.
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Useful to ignore intentional racey reads, while still checking
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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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AnnotateIgnoreReadsBegin(__FILE__, __LINE__)
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/* Stop ignoring reads. */
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#define ANNOTATE_IGNORE_READS_END() \
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AnnotateIgnoreReadsEnd(__FILE__, __LINE__)
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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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AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
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/* Stop ignoring writes. */
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#define ANNOTATE_IGNORE_WRITES_END() \
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AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
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/* Clang provides limited support for static thread-safety analysis
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through a feature called Annotalysis. We configure macro-definitions
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according to whether Annotalysis support is available. */
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#elif defined(ANNOTALYSIS_ENABLED)
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#define ANNOTATE_IGNORE_READS_BEGIN() \
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StaticAnnotateIgnoreReadsBegin(__FILE__, __LINE__)
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#define ANNOTATE_IGNORE_READS_END() \
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StaticAnnotateIgnoreReadsEnd(__FILE__, __LINE__)
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#define ANNOTATE_IGNORE_WRITES_BEGIN() \
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StaticAnnotateIgnoreWritesBegin(__FILE__, __LINE__)
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#define ANNOTATE_IGNORE_WRITES_END() \
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StaticAnnotateIgnoreWritesEnd(__FILE__, __LINE__)
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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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#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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/* Implement the ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more
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primitive annotations defined above. */
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#if defined(ANNOTATIONS_ENABLED)
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/* Start ignoring all memory accesses (both reads and writes). */
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#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \
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do { \
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ANNOTATE_IGNORE_READS_BEGIN(); \
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ANNOTATE_IGNORE_WRITES_BEGIN(); \
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}while (0)
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/* Stop ignoring both reads and writes. */
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#define ANNOTATE_IGNORE_READS_AND_WRITES_END() \
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do { \
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ANNOTATE_IGNORE_WRITES_END(); \
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ANNOTATE_IGNORE_READS_END(); \
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}while (0)
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#else
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#define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() /* empty */
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#define ANNOTATE_IGNORE_READS_AND_WRITES_END() /* empty */
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#endif
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/* Use the macros above rather than using these functions directly. */
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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void AnnotateRWLockCreate(const char *file, int line,
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const volatile void *lock);
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void AnnotateRWLockCreateStatic(const char *file, int line,
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const volatile void *lock);
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void AnnotateRWLockDestroy(const char *file, int line,
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const volatile void *lock);
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void AnnotateRWLockAcquired(const char *file, int line,
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const volatile void *lock, long is_w); /* NOLINT */
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void AnnotateRWLockReleased(const char *file, int line,
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const volatile void *lock, long is_w); /* NOLINT */
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void AnnotateBenignRace(const char *file, int line,
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const volatile void *address,
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const char *description);
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void AnnotateBenignRaceSized(const char *file, int line,
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const volatile void *address,
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size_t size,
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const char *description);
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void AnnotateThreadName(const char *file, int line,
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const char *name);
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void AnnotateEnableRaceDetection(const char *file, int line, int enable);
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void AnnotateMemoryIsInitialized(const char *file, int line,
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const volatile void *mem, size_t size);
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void AnnotateMemoryIsUninitialized(const char *file, int line,
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const volatile void *mem, size_t size);
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/* Annotations expand to these functions, when Dynamic Annotations are enabled.
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These functions are either implemented as no-op calls, if no Sanitizer is
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attached, or provided with externally-linked implementations by a library
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like ThreadSanitizer. */
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void AnnotateIgnoreReadsBegin(const char *file, int line)
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ATTRIBUTE_IGNORE_READS_BEGIN;
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void AnnotateIgnoreReadsEnd(const char *file, int line)
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ATTRIBUTE_IGNORE_READS_END;
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void AnnotateIgnoreWritesBegin(const char *file, int line);
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void AnnotateIgnoreWritesEnd(const char *file, int line);
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#if defined(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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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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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-function"
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static inline void StaticAnnotateIgnoreReadsBegin(const char *file, int line)
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ATTRIBUTE_IGNORE_READS_BEGIN { (void)file; (void)line; }
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static inline void StaticAnnotateIgnoreReadsEnd(const char *file, int line)
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ATTRIBUTE_IGNORE_READS_END { (void)file; (void)line; }
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static inline void StaticAnnotateIgnoreWritesBegin(
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const char *file, int line) { (void)file; (void)line; }
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static inline void StaticAnnotateIgnoreWritesEnd(
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const char *file, int line) { (void)file; (void)line; }
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#pragma GCC diagnostic pop
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#endif
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/* Return non-zero value if running under valgrind.
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If "valgrind.h" is included into dynamic_annotations.cc,
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the regular valgrind mechanism will be used.
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See http://valgrind.org/docs/manual/manual-core-adv.html about
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RUNNING_ON_VALGRIND and other valgrind "client requests".
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The file "valgrind.h" may be obtained by doing
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svn co svn://svn.valgrind.org/valgrind/trunk/include
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If for some reason you can't use "valgrind.h" or want to fake valgrind,
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there are two ways to make this function return non-zero:
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- Use environment variable: export RUNNING_ON_VALGRIND=1
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- Make your tool intercept the function RunningOnValgrind() and
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change its return value.
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*/
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int RunningOnValgrind(void);
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/* ValgrindSlowdown returns:
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* 1.0, if (RunningOnValgrind() == 0)
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* 50.0, if (RunningOnValgrind() != 0 && getenv("VALGRIND_SLOWDOWN") == NULL)
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* atof(getenv("VALGRIND_SLOWDOWN")) otherwise
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This function can be used to scale timeout values:
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EXAMPLE:
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for (;;) {
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DoExpensiveBackgroundTask();
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SleepForSeconds(5 * ValgrindSlowdown());
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}
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*/
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double ValgrindSlowdown(void);
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#ifdef __cplusplus
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}
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#endif
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/* ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads.
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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(__cplusplus) && defined(ANNOTATIONS_ENABLED)
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template <typename T>
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inline T ANNOTATE_UNPROTECTED_READ(const volatile T &x) { /* NOLINT */
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ANNOTATE_IGNORE_READS_BEGIN();
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T res = x;
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ANNOTATE_IGNORE_READS_END();
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return res;
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}
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#else
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#define ANNOTATE_UNPROTECTED_READ(x) (x)
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#endif
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#if DYNAMIC_ANNOTATIONS_ENABLED != 0 && defined(__cplusplus)
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/* Apply ANNOTATE_BENIGN_RACE_SIZED to a static variable. */
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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, \
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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 /* DYNAMIC_ANNOTATIONS_ENABLED == 0 */
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#define ANNOTATE_BENIGN_RACE_STATIC(static_var, description) /* empty */
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#endif /* DYNAMIC_ANNOTATIONS_ENABLED */
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#ifdef ADDRESS_SANITIZER
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/* Describe the current state of a contiguous container such as e.g.
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* std::vector or std::string. For more details see
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* sanitizer/common_interface_defs.h, which is provided by the compiler. */
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#include <sanitizer/common_interface_defs.h>
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#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \
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__sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid)
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#define ADDRESS_SANITIZER_REDZONE(name) \
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struct { char x[8] __attribute__ ((aligned (8))); } name
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#else
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#define ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid)
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#define ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "")
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#endif // ADDRESS_SANITIZER
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/* Undefine the macros intended only in this file. */
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#undef ANNOTALYSIS_ENABLED
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#undef ANNOTATIONS_ENABLED
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#undef ATTRIBUTE_IGNORE_READS_BEGIN
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#undef ATTRIBUTE_IGNORE_READS_END
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#endif /* ABSL_BASE_DYNAMIC_ANNOTATIONS_H_ */
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