[Xray] llvm-xray fix possible segfault
top argument when superior to the instrumentated code list capacity can lead to a segfault. Reviewers: dberris Reviewed By: dberris Differential Revision: https://reviews.llvm.org/D52224 llvm-svn: 342461
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@ -358,8 +358,11 @@ void LatencyAccountant::exportStats(const XRayFileHeader &Header, F Fn) const {
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break;
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}
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if (AccountTop > 0)
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Results.erase(Results.begin() + AccountTop.getValue(), Results.end());
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if (AccountTop > 0) {
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auto MaxTop =
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std::min(AccountTop.getValue(), static_cast<int>(Results.size()));
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Results.erase(Results.begin() + MaxTop, Results.end());
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}
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for (const auto &R : Results)
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Fn(std::get<0>(R), std::get<1>(R), std::get<2>(R));
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