Merge pull request github#18510 from jketema/noreturn

C++: Support more "noreturn" attributes in DefaultOptions

Author: jketema

cpp/ql/lib/DefaultOptions.qll

@@ -54,11 +54,11 @@ class Options extends string {
    *
    * By default, this holds for `exit`, `_exit`, `_Exit`, `abort`,
    * `__assert_fail`, `longjmp`, `__builtin_unreachable` and any
-   * function with a `noreturn` or `__noreturn__` attribute or
-   * `noreturn` specifier.
+   * function with a `noreturn`, `__noreturn__`, or `_Noreturn`
+   * attribute or `noreturn` specifier.
    */
   predicate exits(Function f) {
-    f.getAnAttribute().hasName(["noreturn", "__noreturn__"])
+    f.getAnAttribute().hasName(["noreturn", "__noreturn__", "_Noreturn"])
     or
     f.getASpecifier().hasName("noreturn")
     or

cpp/ql/lib/change-notes/2025-01-16-noreturn.md

@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* `DefaultOptions::exits` now holds for C23 functions with the `_Noreturn` or `___Noreturn__` attribute.

cpp/ql/test/query-tests/jsf/4.13 Functions/AV Rule 114/test.c

@@ -1,4 +1,4 @@
-// semmle-extractor-options: -std=c11
+// semmle-extractor-options: -std=c23
 int f1(void) {
     int x = 1;
     return 2;
@@ -110,3 +110,27 @@ int f17() {
     if (__builtin_expect(1, 0))
         __builtin_unreachable(); // GOOD
 }
+
+[[_Noreturn]] void f18();
+
+int f19() {
+    f18(); // GOOD
+}
+
+[[___Noreturn__]] void f20();
+
+int f21() {
+    f20(); // GOOD
+}
+
+[[noreturn]] void f22();
+
+int f23() {
+    f22(); // GOOD
+}
+
+[[__noreturn__]] void f24();
+
+int f25() {
+    f24(); // GOOD
+}

cpp/ql/test/query-tests/jsf/4.13 Functions/AV Rule 114/test.cpp

@@ -188,3 +188,10 @@ int g22() {
 int g23() {
 	Aborting().a(); // GOOD [FALSE POSITIVE]
 }
+
+[[__noreturn__]]
+int g24();
+
+int g25() {
+	g24(); // GOOD
+}