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include/qemu: Added tsan.h for annotations. 

These annotations will allow us to give tsan
additional hints.  For example, we can inform
tsan about reads/writes to ignore to silence certain
classes of warnings.
We can also annotate threads so that the proper thread
naming shows up in tsan warning results.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200609200738.445-11-robert.foley@linaro.org>
Message-Id: <20200612190237.30436-14-alex.bennee@linaro.org>
stable-6.0
Robert Foley 2020-06-12 20:02:32 +01:00 committed by Alex Bennée
parent df79fd5667
commit e51345eea9
1 changed files with 71 additions and 0 deletions
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include/qemu/tsan.h 100644
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#ifndef QEMU_TSAN_H
#define QEMU_TSAN_H
/*
* tsan.h
*
* This file defines macros used to give ThreadSanitizer
* additional information to help suppress warnings.
* This is necessary since TSan does not provide a header file
* for these annotations. The standard way to include these
* is via the below macros.
*
* Annotation examples can be found here:
* https://github.com/llvm/llvm-project/tree/master/compiler-rt/test/tsan
* annotate_happens_before.cpp or ignore_race.cpp are good places to start.
*
* The full set of annotations can be found here in tsan_interface_ann.cpp.
* https://github.com/llvm/llvm-project/blob/master/compiler-rt/lib/tsan/rtl/
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifdef CONFIG_TSAN
/*
* Informs TSan of a happens before/after relationship.
*/
#define QEMU_TSAN_ANNOTATE_HAPPENS_BEFORE(addr) \
AnnotateHappensBefore(__FILE__, __LINE__, (void *)(addr))
#define QEMU_TSAN_ANNOTATE_HAPPENS_AFTER(addr) \
AnnotateHappensAfter(__FILE__, __LINE__, (void *)(addr))
/*
* Gives TSan more information about thread names it can report the
* name of the thread in the warning report.
*/
#define QEMU_TSAN_ANNOTATE_THREAD_NAME(name) \
AnnotateThreadName(__FILE__, __LINE__, (void *)(name))
/*
* Allows defining a region of code on which TSan will not record memory READS.
* This has the effect of disabling race detection for this section of code.
*/
#define QEMU_TSAN_ANNOTATE_IGNORE_READS_BEGIN() \
AnnotateIgnoreReadsBegin(__FILE__, __LINE__)
#define QEMU_TSAN_ANNOTATE_IGNORE_READS_END() \
AnnotateIgnoreReadsEnd(__FILE__, __LINE__)
/*
* Allows defining a region of code on which TSan will not record memory
* WRITES. This has the effect of disabling race detection for this
* section of code.
*/
#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_BEGIN() \
AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_END() \
AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
#else
#define QEMU_TSAN_ANNOTATE_HAPPENS_BEFORE(addr)
#define QEMU_TSAN_ANNOTATE_HAPPENS_AFTER(addr)
#define QEMU_TSAN_ANNOTATE_THREAD_NAME(name)
#define QEMU_TSAN_ANNOTATE_IGNORE_READS_BEGIN()
#define QEMU_TSAN_ANNOTATE_IGNORE_READS_END()
#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_BEGIN()
#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_END()
#endif
void AnnotateHappensBefore(const char *f, int l, void *addr);
void AnnotateHappensAfter(const char *f, int l, void *addr);
void AnnotateThreadName(const char *f, int l, char *name);
void AnnotateIgnoreReadsBegin(const char *f, int l);
void AnnotateIgnoreReadsEnd(const char *f, int l);
void AnnotateIgnoreWritesBegin(const char *f, int l);
void AnnotateIgnoreWritesEnd(const char *f, int l);
#endif