test/CodeGen/2008-07-30-redef-of-bitcasted-decl.c

   1 // RUN: %clang_cc1 -emit-llvm -o - %s
   2 // <rdar://problem/6108358>
   3
   4 /* For posterity, the issue here begins initial "char []" decl for
   5  * s. This is a tentative definition and so a global was being
   6  * emitted, however the mapping in GlobalDeclMap referred to a bitcast
   7  * of this global.
   8  *
   9  * The problem was that later when the correct definition for s is
  10  * emitted we were doing a RAUW on the old global which was destroying
  11  * the bitcast in the GlobalDeclMap (since it cannot be replaced
  12  * properly), leaving a dangling pointer.
  13  *
  14  * The purpose of bar is just to trigger a use of the old decl
  15  * sometime after the dangling pointer has been introduced.
  16  */
  17
  18 char s[];
  19
  20 static void bar(void *db) {
  21   eek(s);
  22 }
  23
  24 char s[5] = "hi";
  25
  26 int foo() {
  27   bar(0);
  28 }