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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - lambdas with reference default capture should inherit NO_THREAD_SAFETY_ANALYSIS annotation from parent function"
href="https://bugs.llvm.org/show_bug.cgi?id=52467">52467</a>
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<th>Summary</th>
<td>lambdas with reference default capture should inherit NO_THREAD_SAFETY_ANALYSIS annotation from parent function
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>redbeard0531@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Lambdas like [&] are generally only valid to call within the scope of their
parent function. Given this, they should inherit the NO_THREAD_SAFETY_ANALYSIS
state from their parent function. This is especially important inside of
constructors, which are implicitly NO_THREAD_SAFETY_ANALYSIS, so their [&]
lambdas should get the same treatment.
<a href="https://godbolt.org/z/WcqY7P8za">https://godbolt.org/z/WcqY7P8za</a>
#define CAPABILITY(x) __attribute__((capability(x)))
#define GUARDED_BY(x) __attribute__((guarded_by(x)))
#define NO_THREAD_SAFETY_ANALYSIS __attribute__((no_thread_safety_analysis))
class CAPABILITY("mutex") CheckedMutex {};
template <typename F>
void call(F&& f) { f(); }
struct Example {
Example() { // Implicitly NO_THREAD_SAFETY_ANALYSIS
member++; // Fine
call([&] { member++; }); // Warns
call([&] () NO_THREAD_SAFETY_ANALYSIS { member++; }); // Fine
}
mutable CheckedMutex mx;
int member GUARDED_BY(mx) = 0;
};</pre>
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