Add tests for non-virtual call checking.

[jfb]

lgtm besides comment.

test/cfi/nvcall.cpp

51

Could you add a comment which explain the point of B32/B64/BM? IIUC it's just creating bigger numbers of derived classes, all with a bunch of virtuals?

[pcc]

test/cfi/nvcall.cpp

51

Most of the tests in this directory use these macros, so I've documented them in a README.txt file in this directory.

test/cfi/nvcall.cpp

+// RUN: %clangxx_cfi -o %t %s
+// RUN: not --crash %t 2>&1 | FileCheck --check-prefix=CFI %s
+
+// RUN: %clangxx_cfi -DB32 -o %t %s
+// RUN: not --crash %t 2>&1 | FileCheck --check-prefix=CFI %s
+
+// RUN: %clangxx_cfi -DB64 -o %t %s
+// RUN: not --crash %t 2>&1 | FileCheck --check-prefix=CFI %s
+
+// RUN: %clangxx_cfi -DBM -o %t %s
+// RUN: not --crash %t 2>&1 | FileCheck --check-prefix=CFI %s
+
+// RUN: %clangxx -o %t %s
+// RUN: %t 2>&1 | FileCheck --check-prefix=NCFI %s
+
+// Tests that the CFI mechanism crashes the program when making a non-virtual
+// call to an object of the wrong class, by casting a pointer to such an object
+// and attempting to make a call through it.
+
+#include <stdio.h>
+#include "utils.h"
+
+struct A {
+  virtual void f();
+};
+
+void A::f() {}
+
+struct B {
+  void f();
+  virtual void g();
+};
+
+void B::f() {}
+void B::g() {}
+
+int main() {
+#ifdef B32
+  break_optimization(new Deriver<B, 0>);
+#endif
+
+#ifdef B64
+  break_optimization(new Deriver<B, 0>);
+  break_optimization(new Deriver<B, 1>);
+#endif
+
+#ifdef BM
+  break_optimization(new Deriver<B, 0>);
+  break_optimization(new Deriver<B, 1>);
+  break_optimization(new Deriver<B, 2>);
+#endif
+
+  A *a = new A;
+  break_optimization(a);
+
+  // CFI: 1
+  // NCFI: 1
+  fprintf(stderr, "1\n");
+
+  ((B *)a)->f(); // UB here
+
+  // CFI-NOT: 2
+  // NCFI: 2
+  fprintf(stderr, "2\n");
+}

test/cfi/simple-pass.cpp

 // RUN: %clangxx_cfi -o %t %s
 // RUN: %t
 
 // Tests that the CFI mechanism does not crash the program when making various
 // kinds of valid calls involving classes with various different linkages and
-// types of inheritance.
+// types of inheritance, and both virtual and non-virtual member functions.
 
 #include "utils.h"
 
 struct A {
   virtual void f();
+  void g();
 };
 
 void A::f() {}
+void A::g() {}
 
 struct A2 : A {
   virtual void f();
+  void g();
 };
 
 void A2::f() {}
+void A2::g() {}
 
 struct B {
   virtual void f() {}
+  void g() {}
 };
 
 struct B2 : B {
   virtual void f() {}
+  void g() {}
 };
 
 namespace {
 
 struct C {
   virtual void f();
+  void g();
 };
 
 void C::f() {}
+void C::g() {}
 
 struct C2 : C {
   virtual void f();
+  void g();
 };
 
 void C2::f() {}
+void C2::g() {}
 
 struct D {
   virtual void f() {}
+  void g() {}
 };
 
 struct D2 : D {
   virtual void f() {}
+  void g() {}
 };
 
 }
 
 struct E {
   virtual void f() {}
+  void g() {}
 };
 
 struct E2 : virtual E {
   virtual void f() {}
+  void g() {}
 };
 
 int main() {
   A *a = new A;
   break_optimization(a);
   a->f();
+  a->g();
   a = new A2;
   break_optimization(a);
   a->f();
+  a->g();
 
   B *b = new B;
   break_optimization(b);
   b->f();
+  b->g();
   b = new B2;
   break_optimization(b);
   b->f();
+  b->g();
 
   C *c = new C;
   break_optimization(c);
   c->f();
+  c->g();
   c = new C2;
   break_optimization(c);
   c->f();
+  c->g();
 
   D *d = new D;
   break_optimization(d);
   d->f();
+  d->g();
   d = new D2;
   break_optimization(d);
   d->f();
+  d->g();
 
   E *e = new E;
   break_optimization(e);
   e->f();
+  e->g();
   e = new E2;
   break_optimization(e);
   e->f();
+  e->g();
 }