================
@@ -0,0 +1,256 @@
+// RUN: %clang_cc1 -fsyntax-only -fblocks -fcxx-exceptions -std=c++20 -verify
%s
+// These are in a separate file because errors (e.g. incompatible attributes)
currently prevent
+// the FXAnalysis pass from running at all.
+
+// This diagnostic is re-enabled and exercised in isolation later in this file.
+#pragma clang diagnostic ignored "-Wperf-constraint-implies-noexcept"
+
+// --- CONSTRAINTS ---
+
+void nb1() [[clang::nonblocking]]
+{
+ int *pInt = new int; // expected-warning {{'nonblocking' function must
not allocate or deallocate memory}}
+ delete pInt; // expected-warning {{'nonblocking' function must not
allocate or deallocate memory}}
+}
+
+void nb2() [[clang::nonblocking]]
+{
+ static int global; // expected-warning {{'nonblocking' function must
not have static locals}}
+}
+
+void nb3() [[clang::nonblocking]]
+{
+ try {
+ throw 42; // expected-warning {{'nonblocking' function must not
throw or catch exceptions}}
+ }
+ catch (...) { // expected-warning {{'nonblocking' function must not
throw or catch exceptions}}
+ }
+}
+
----------------
dougsonos wrote:
Tracking whether the violation originated from a member initializer, and
changing "function" to "member initializer" in the diagnostic is a bunch of
busywork but straightforward:
```
warning: 'nonblocking' member initializer must not allocate or deallocate
memory [-Wfunction-effects]
12 | int *x = new int(42);
note: member initializer cannot be inferred 'nonblocking' because it allocates
or deallocates memory
28 | int *x = new int(42);
```
In both cases this could be followed by a note "invoked by constructor here"...
https://github.com/llvm/llvm-project/pull/99656
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