clang/test/CodeGen/fixup-depth-overflow.c

   1 // RUN: %clang_cc1 -O1 -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s
   2
   3 #define M if (x) goto L1;
   4 #define M10 M M M M M M M M M M
   5 #define M100 M10 M10 M10 M10 M10 M10 M10 M10 M10 M10
   6 #define M1000 M100 M100 M100 M100 M100 M100 M100 M100 M100 M100
   7
   8 void f(int x) {
   9   int h;
  10
  11   // Many gotos to not-yet-emitted labels would cause EHScope's FixupDepth
  12   // to overflow (PR23490).
  13   M1000 M1000 M1000
  14
  15   if (x == 5) {
  16     // This will cause us to emit a clean-up of the stack variable. If the
  17     // FixupDepths are broken, fixups will erroneously get threaded through it.
  18     int i;
  19   }
  20
  21 L1:
  22   return;
  23 }
  24
  25 // CHECK-LABEL: define {{(dso_local )?}}void @f
  26 // CHECK-NOT: cleanup
  27 // CHECK: {{^!0 = }}
  28 // We might see 'cleanup' as part of a pathname or versioning in metadata