clang/test/CodeGen/pr52382.c

   1 // RUN: %clang -target x86_64-unknown-linux-gnu -S -emit-llvm -o - -fsanitize=address %s | FileCheck %s
   2
   3 // Ensure that ASan properly instruments a load into a global where the index
   4 // happens to be within the padding after the global which is used for the
   5 // redzone.
   6
   7 // This global is 400 bytes long, but gets padded with 112 bytes for redzones,
   8 // rounding the total size after instrumentation to 512.
   9 int global_array[100] = {-1};
  10
  11 // This access is 412 bytes after the start of the global: past the end of the
  12 // uninstrumented array, but within the bounds of the extended instrumented
  13 // array. We should ensure this is still instrumented.
  14 int main(void) { return global_array[103]; }
  15
  16 // CHECK: @main
  17 // CHECK-NEXT: entry:
  18 // CHECK: call void @__asan_report_load4
  19 // CHECK: }