llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang Author: Prabhu Rajasekaran (Prabhuk) <details> <summary>Changes</summary> When the variable guared by a lock was enclosed in parenthesis, access violation warnings were not emitted. This patch fixes it and adds a regression test. --- Full diff: https://github.com/llvm/llvm-project/pull/140656.diff 2 Files Affected: - (modified) clang/lib/Analysis/ThreadSafety.cpp (+1-1) - (added) clang/test/Analysis/thread-safety-handle-parenthesis.cpp (+20) ``````````diff diff --git a/clang/lib/Analysis/ThreadSafety.cpp b/clang/lib/Analysis/ThreadSafety.cpp index 7e86af6b4a317..156df51a71012 100644 --- a/clang/lib/Analysis/ThreadSafety.cpp +++ b/clang/lib/Analysis/ThreadSafety.cpp @@ -1671,7 +1671,7 @@ void ThreadSafetyAnalyzer::checkAccess(const FactSet &FSet, const Expr *Exp, // Guard against self-initialization. e.g., int &i = i; if (E == Exp) break; - Exp = E; + Exp = E->IgnoreImplicit()->IgnoreParenCasts(); continue; } } diff --git a/clang/test/Analysis/thread-safety-handle-parenthesis.cpp b/clang/test/Analysis/thread-safety-handle-parenthesis.cpp new file mode 100644 index 0000000000000..6be8362a650e0 --- /dev/null +++ b/clang/test/Analysis/thread-safety-handle-parenthesis.cpp @@ -0,0 +1,20 @@ + +// RUN: %clang_cc1 -verify -fsyntax-only -std=c++20 -Wthread-safety %s + +class __attribute__((lockable)) Lock {}; + +void sink_protected(int) {} + +class Baz { +public: + Lock lock_; + int protected_num_ __attribute__((guarded_by(lock_))) = 1; +}; + +void baz_paran_test() { + Baz baz; + int& n = baz.protected_num_; + sink_protected(n); // expected-warning{{reading variable 'protected_num_' requires holding mutex 'baz.lock_'}} + int& n2 = (baz.protected_num_); + sink_protected(n2); // expected-warning{{reading variable 'protected_num_' requires holding mutex 'baz.lock_'}} +} `````````` </details> https://github.com/llvm/llvm-project/pull/140656 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
