[clang][Interp][NFC] Add thread_local tests

clang/test/AST/Interp/cxx23.cpp

@@ -0,0 +1,84 @@
+// RUN: %clang_cc1 -std=c++20 -fsyntax-only -fcxx-exceptions -verify=ref20 %s
+// RUN: %clang_cc1 -std=c++23 -fsyntax-only -fcxx-exceptions -verify=ref23 %s
+// RUN: %clang_cc1 -std=c++20 -fsyntax-only -fcxx-exceptions -verify=expected20 %s -fexperimental-new-constant-interpreter
+// RUN: %clang_cc1 -std=c++23 -fsyntax-only -fcxx-exceptions -verify=expected23 %s -fexperimental-new-constant-interpreter
+
+
+// expected23-no-diagnostics
+
+
+/// FIXME: The new interpreter is missing all the 'control flows through...' diagnostics.
+
+constexpr int f(int n) {  // ref20-error {{constexpr function never produces a constant expression}} \
+                          // ref23-error {{constexpr function never produces a constant expression}}
+  static const int m = n; // ref20-note {{control flows through the definition of a static variable}} \
+                          // ref20-warning {{is a C++23 extension}} \
+                          // ref23-note {{control flows through the definition of a static variable}} \
+                          // expected20-warning {{is a C++23 extension}}
+
+  return m;
+}
+constexpr int g(int n) {        // ref20-error {{constexpr function never produces a constant expression}} \
+                                // ref23-error {{constexpr function never produces a constant expression}}
+  thread_local const int m = n; // ref20-note {{control flows through the definition of a thread_local variable}} \
+                                // ref20-warning {{is a C++23 extension}} \
+                                // ref23-note {{control flows through the definition of a thread_local variable}} \
+                                // expected20-warning {{is a C++23 extension}}
+  return m;
+}
+
+constexpr int c_thread_local(int n) { // ref20-error {{constexpr function never produces a constant expression}} \
+                                      // ref23-error {{constexpr function never produces a constant expression}}
+  static _Thread_local int m = 0;     // ref20-note {{control flows through the definition of a thread_local variable}} \
+                                      // ref20-warning {{is a C++23 extension}} \
+                                      // ref23-note {{control flows through the definition of a thread_local variable}} \
+                                      // expected20-warning {{is a C++23 extension}}
+  return m;
+}
+
+
+constexpr int gnu_thread_local(int n) { // ref20-error {{constexpr function never produces a constant expression}} \
+                                        // ref23-error {{constexpr function never produces a constant expression}}
+  static __thread int m = 0;            // ref20-note {{control flows through the definition of a thread_local variable}} \
+                                        // ref20-warning {{is a C++23 extension}} \
+                                        // ref23-note {{control flows through the definition of a thread_local variable}} \
+                                        // expected20-warning {{is a C++23 extension}}
+  return m;
+}
+
+constexpr int h(int n) {  // ref20-error {{constexpr function never produces a constant expression}} \
+                          // ref23-error {{constexpr function never produces a constant expression}}
+  static const int m = n; // ref20-note {{control flows through the definition of a static variable}} \
+                          // ref20-warning {{is a C++23 extension}} \
+                          // ref23-note {{control flows through the definition of a static variable}} \
+                          // expected20-warning {{is a C++23 extension}}
+  return &m - &m;
+}
+
+constexpr int i(int n) {        // ref20-error {{constexpr function never produces a constant expression}} \
+                                // ref23-error {{constexpr function never produces a constant expression}}
+  thread_local const int m = n; // ref20-note {{control flows through the definition of a thread_local variable}} \
+                                // ref20-warning {{is a C++23 extension}} \
+                                // ref23-note {{control flows through the definition of a thread_local variable}} \
+                                // expected20-warning {{is a C++23 extension}}
+  return &m - &m;
+}
+
+constexpr int j(int n) {
+  if (!n)
+    return 0;
+  static const int m = n; // ref20-warning {{is a C++23 extension}} \
+                          // expected20-warning {{is a C++23 extension}}
+  return m;
+}
+constexpr int j0 = j(0);
+
+constexpr int k(int n) {
+  if (!n)
+    return 0;
+  thread_local const int m = n; // ref20-warning {{is a C++23 extension}} \
+                                // expected20-warning {{is a C++23 extension}}
+
+  return m;
+}
+constexpr int k0 = k(0);