1 files changed, 44 insertions, 0 deletions
diff --git a/compiler-rt/test/asan/TestCases/alloca_constant_size.cc b/compiler-rt/test/asan/TestCases/alloca_constant_size.cc
new file mode 100644
index 00000000000..43144b4736a
--- /dev/null
+++ b/compiler-rt/test/asan/TestCases/alloca_constant_size.cc
@@ -0,0 +1,44 @@
+// Regression test for https://github.com/google/sanitizers/issues/691
+
+// RUN: %clangxx_asan -O0 %s -o %t -fstack-protector
+// RUN: %run %t 1 2>&1 | FileCheck %s
+// RUN: %run %t 2 2>&1 | FileCheck %s
+
+#include <alloca.h>
+#include <stdio.h>
+#include <string.h>
+
+void f1_alloca() {
+  char *dynamic_buffer = (char *)alloca(200);
+  fprintf(stderr, "dynamic_buffer = %p\n", dynamic_buffer);
+  memset(dynamic_buffer, 'y', 200);
+  return;
+}
+
+static const int kDynamicArraySize = 200;
+
+void f1_vla() {
+  char dynamic_buffer[kDynamicArraySize];
+  fprintf(stderr, "dynamic_buffer = %p\n", dynamic_buffer);
+  memset(dynamic_buffer, 'y', kDynamicArraySize);
+  return;
+}
+
+void f2() {
+  char buf[1024];
+  memset(buf, 'x', 1024);
+}
+
+int main(int argc, const char *argv[]) {
+  if (!strcmp(argv[1], "1")) {
+    f1_alloca();
+  } else if (!strcmp(argv[1], "2")) {
+    f1_vla();
+  }
+  f2();
+  fprintf(stderr, "Done.\n");
+  return 0;
+}
+
+// CHECK-NOT: ERROR: AddressSanitizer
+// CHECK: Done.