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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>
72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
#ifndef QEMU_TSAN_H
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#define QEMU_TSAN_H
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/*
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* tsan.h
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*
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* This file defines macros used to give ThreadSanitizer
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* additional information to help suppress warnings.
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* This is necessary since TSan does not provide a header file
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* for these annotations. The standard way to include these
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* is via the below macros.
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*
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* Annotation examples can be found here:
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* https://github.com/llvm/llvm-project/tree/master/compiler-rt/test/tsan
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* annotate_happens_before.cpp or ignore_race.cpp are good places to start.
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*
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* The full set of annotations can be found here in tsan_interface_ann.cpp.
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* https://github.com/llvm/llvm-project/blob/master/compiler-rt/lib/tsan/rtl/
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifdef CONFIG_TSAN
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/*
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* Informs TSan of a happens before/after relationship.
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*/
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#define QEMU_TSAN_ANNOTATE_HAPPENS_BEFORE(addr) \
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AnnotateHappensBefore(__FILE__, __LINE__, (void *)(addr))
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#define QEMU_TSAN_ANNOTATE_HAPPENS_AFTER(addr) \
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AnnotateHappensAfter(__FILE__, __LINE__, (void *)(addr))
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/*
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* Gives TSan more information about thread names it can report the
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* name of the thread in the warning report.
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*/
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#define QEMU_TSAN_ANNOTATE_THREAD_NAME(name) \
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AnnotateThreadName(__FILE__, __LINE__, (void *)(name))
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/*
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* Allows defining a region of code on which TSan will not record memory READS.
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* This has the effect of disabling race detection for this section of code.
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*/
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#define QEMU_TSAN_ANNOTATE_IGNORE_READS_BEGIN() \
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AnnotateIgnoreReadsBegin(__FILE__, __LINE__)
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#define QEMU_TSAN_ANNOTATE_IGNORE_READS_END() \
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AnnotateIgnoreReadsEnd(__FILE__, __LINE__)
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/*
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* Allows defining a region of code on which TSan will not record memory
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* WRITES. This has the effect of disabling race detection for this
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* section of code.
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*/
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#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_BEGIN() \
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AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
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#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_END() \
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AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
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#else
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#define QEMU_TSAN_ANNOTATE_HAPPENS_BEFORE(addr)
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#define QEMU_TSAN_ANNOTATE_HAPPENS_AFTER(addr)
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#define QEMU_TSAN_ANNOTATE_THREAD_NAME(name)
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#define QEMU_TSAN_ANNOTATE_IGNORE_READS_BEGIN()
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#define QEMU_TSAN_ANNOTATE_IGNORE_READS_END()
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#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_BEGIN()
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#define QEMU_TSAN_ANNOTATE_IGNORE_WRITES_END()
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#endif
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void AnnotateHappensBefore(const char *f, int l, void *addr);
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void AnnotateHappensAfter(const char *f, int l, void *addr);
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void AnnotateThreadName(const char *f, int l, char *name);
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void AnnotateIgnoreReadsBegin(const char *f, int l);
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void AnnotateIgnoreReadsEnd(const char *f, int l);
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void AnnotateIgnoreWritesBegin(const char *f, int l);
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void AnnotateIgnoreWritesEnd(const char *f, int l);
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#endif
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