Update test

Author: vitalybuka

compiler-rt/test/asan/TestCases/disable_fake_stack.cpp

@@ -2,27 +2,30 @@
 
 #include "defines.h"
 
+#include <cassert>
 #include <sanitizer/asan_interface.h>
 
-volatile char *saved;
+volatile uintptr_t saved;
+
+ATTRIBUTE_NOINLINE bool IsOnRealStack(uintptr_t caller_frame) {
+  uintptr_t this_frame = reinterpret_cast<uintptr_t>(__builtin_frame_address(0));
+  return this_frame <= saved && saved <= caller_frame;
+}
 
 ATTRIBUTE_NOINLINE bool IsOnStack() {
   volatile char temp = ' ';
-  void *fake_stack = __asan_get_current_fake_stack();
-  void *real = __asan_addr_is_in_fake_stack(
-      fake_stack, const_cast<char *>(&temp), nullptr, nullptr);
-  saved = &temp;
-  return real == nullptr;
+  saved = reinterpret_cast<uintptr_t>(&temp);
+  return IsOnRealStack(reinterpret_cast<uintptr_t>(__builtin_frame_address(0)));
 }
 
 int main(int argc, char *argv[]) {
+  assert(!IsOnStack());
+
   __asan_disable_fake_stack();
-  if (!IsOnStack()) {
-    return 1;
-  }
+  assert(IsOnStack());
+
   __asan_enable_fake_stack();
-  if (IsOnStack()) {
-    return 2;
-  }
+  assert(!IsOnStack());
+
   return 0;
 }