[ASAN] Add test to check detection of stack-use-after-scope on various types

[vitalybuka]

Summary

Test for D22657

PR27453

[vitalybuka]

format

[eugenis]

LGTM

test/asan/TestCases/use-after-scope-types.cc

83

maybe change the condition to if (argc == 1) to avoid the magic constant "12" meaning "run all tests".

test/asan/TestCases/use-after-scope-chars.cc

-// RUN: %clangxx_asan -O1 -fsanitize-address-use-after-scope %s -o %t && \
-// RUN:     not %run %t 2>&1 | FileCheck %s
-// XFAIL: *
-
-// FIXME: This works only for arraysize <= 8.
-
-char *p = 0;
-
-int main() {
-  {
-    char x[1024] = {};
-    p = x;
-  }
-  return *p;  // BOOM
-}

test/asan/TestCases/use-after-scope-types.cc

+// RUN: %clangxx_asan -std=c++11 -O0 -fsanitize-address-use-after-scope %s -o %t
+// RUN: export %env_asan_opts=detect_stack_use_after_scope=1
+// RUN: not %run %t 0 2>&1 | FileCheck %s
+// RUN: not %run %t 1 2>&1 | FileCheck %s
+// RUN: not %run %t 2 2>&1 | FileCheck %s
+// RUN: not %run %t 3 2>&1 | FileCheck %s
+// RUN: not %run %t 4 2>&1 | FileCheck %s
+// RUN: not %run %t 5 2>&1 | FileCheck %s
+// RUN: not %run %t 6 2>&1 | FileCheck %s
+// RUN: not %run %t 7 2>&1 | FileCheck %s
+// RUN: not %run %t 8 2>&1 | FileCheck %s
+// RUN: not %run %t 9 2>&1 | FileCheck %s
+// RUN: not %run %t 10 2>&1 | FileCheck %s
+// RUN: not %run %t 11 2>&1 | FileCheck %s
+
+// RUN: %env_asan_opts=detect_stack_use_after_scope=0 %run %t 12
+
+#include <stdlib.h>
+#include <string>
+#include <vector>
+
+template <class T> struct Ptr {
+  void Store(T *ptr) { t = ptr; }
+
+  void Access() { *t = {}; }
+
+  T *t;
+};
+
+template <class T, size_t N> struct Ptr<T[N]> {
+  using Type = T[N];
+  void Store(Type *ptr) { t = *ptr; }
+
+  void Access() { *t = {}; }
+
+  T *t;
+};
+
+template <class T> void test() {
+  Ptr<T> ptr;
+  {
+    T x;
+    ptr.Store(&x);
+  }
+
+  ptr.Access();
+  // CHECK: ERROR: AddressSanitizer: stack-use-after-scope
+  // CHECK:  #{{[0-9]+}} 0x{{.*}} in void test{{.*}}(){{.*}}use-after-scope-types.cc:[[@LINE-2]]
+  // CHECK: Address 0x{{.*}} is located in stack of thread T{{.*}} at offset [[OFFSET:[^ ]+]] in frame
+  // {{\[}}[[OFFSET]], {{[0-9]+}}) 'x'
+}
+
+int main(int argc, char **argv) {
+  using Tests = void (*)();
+  Tests tests[] = {
+    &test<bool>,
+    &test<char>,
+    &test<int>,
+    &test<double>,
+    &test<float>,
+    &test<uint64_t>,
+    &test<void*>,
+    &test<std::vector<std::string>>,
+    &test<int[3]>,
+    &test<int[1000]>,
+    &test<char[3]>,
+    &test<char[1000]>,
+  };
+
+  int n = atoi(argv[1]);
+  if (n == sizeof(tests) / sizeof(tests[0])) {
+    for (auto te : tests)
+      te();
+  } else {
+    tests[n]();
+  }
+
+  return 0;
+}