[clang] [clang] Implement lifetime analysis for lifetime_capture_by(X) (PR #115921)
Utkarsh Saxena via cfe-commits
cfe-commits at lists.llvm.org
Fri Nov 15 02:14:31 PST 2024
================
@@ -793,3 +806,202 @@ void test13() {
}
} // namespace GH100526
+
+namespace lifetime_capture_by {
+struct X {
+ const int *x;
+ void captureInt(const int& x [[clang::lifetime_capture_by(this)]]) { this->x = &x; }
+ void captureSV(std::string_view sv [[clang::lifetime_capture_by(this)]]);
+};
+///////////////////////////
+// Detect dangling cases.
+///////////////////////////
+void captureInt(const int& i [[clang::lifetime_capture_by(x)]], X& x);
+void captureRValInt(int&& i [[clang::lifetime_capture_by(x)]], X& x);
+void noCaptureInt(int i [[clang::lifetime_capture_by(x)]], X& x);
+
+std::string_view substr(const std::string& s [[clang::lifetimebound]]);
+std::string_view strcopy(const std::string& s);
+
+void captureSV(std::string_view s [[clang::lifetime_capture_by(x)]], X& x);
+void captureRValSV(std::string_view&& sv [[clang::lifetime_capture_by(x)]], X& x);
+void noCaptureSV(std::string_view sv, X& x);
+void captureS(const std::string& s [[clang::lifetime_capture_by(x)]], X& x);
+void captureRValS(std::string&& s [[clang::lifetime_capture_by(x)]], X& x);
+
+const std::string& getLB(const std::string& s[[clang::lifetimebound]]);
+const std::string& getLB(std::string_view sv[[clang::lifetimebound]]);
+const std::string* getPointerLB(const std::string& s[[clang::lifetimebound]]);
+const std::string* getPointerNoLB(const std::string& s);
+
+void capturePointer(const std::string* sp [[clang::lifetime_capture_by(x)]], X& x);
+
+struct ThisIsCaptured {
+ void capture(X& x) [[clang::lifetime_capture_by(x)]];
+ void bar(X& x) [[clang::lifetime_capture_by(abcd)]]; // expected-error {{'lifetime_capture_by' attribute argument 'abcd' is not a known function parameter}}
----------------
usx95 wrote:
Done.
https://github.com/llvm/llvm-project/pull/115921
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