clang/test/CodeGen/init-randomized-struct-fwd-decl.c

   1 // RUN: %clang_cc1 -triple=x86_64-unknown-linux -emit-llvm -frandomize-layout-seed=1234567890abcdef < %s | FileCheck %s
   2 // PR60349
   3
   4 // Clang will add a forward declaration of "struct bar" and "enum qux" to the
   5 // structures. This shouldn't prevent these structures from being randomized.
   6 // So the 'f' element shouldn't be at the start of the structure anymore.
   7
   8 struct foo {
   9   struct bar *(*f)(void);
  10   struct bar *(*g)(void);
  11   struct bar *(*h)(void);
  12   struct bar *(*i)(void);
  13   struct bar *(*j)(void);
  14   struct bar *(*k)(void);
  15 };
  16
  17 // CHECK-LABEL: define {{.*}}@t1(
  18 // CHECK-NOT: getelementptr inbounds %struct.foo, ptr %3, i32 0, i32 0
  19 struct bar *t1(struct foo *z) {
  20   return z->f();
  21 }
  22
  23 struct baz {
  24   enum qux *(*f)(void);
  25   enum qux *(*g)(void);
  26   enum qux *(*h)(void);
  27   enum qux *(*i)(void);
  28   enum qux *(*j)(void);
  29   enum qux *(*k)(void);
  30 };
  31
  32 // CHECK-LABEL: define {{.*}}@t2(
  33 // CHECK-NOT: getelementptr inbounds %struct.baz, ptr %3, i32 0, i32 0
  34 enum qux *t2(struct baz *z) {
  35   return z->f();
  36 }