Roll forward poisoned pointer API and fix portability issues.

Also, return the middle of the poisoned block.

PiperOrigin-RevId: 651119057
Change-Id: Iae0fc3dcb40e32cd449f469d9b8d62c37f3773f4

1 files changed, 41 insertions, 0 deletions

diff --git a/absl/base/internal/poison_test.cc b/absl/base/internal/poison_test.cc
new file mode 100644
index 00000000..6596b454
--- /dev/null
+++ b/absl/base/internal/poison_test.cc
@@ -0,0 +1,41 @@
+// Copyright 2024 The Abseil Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/poison.h"
+
+#include <iostream>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace base_internal {
+namespace {
+
+TEST(PoisonTest, CrashesOnDereference) {
+#ifdef __ANDROID__
+  GTEST_SKIP() << "On Android, poisoned pointer dereference times out instead "
+                  "of crashing.";
+#endif
+  int* poisoned_ptr = static_cast<int*>(get_poisoned_pointer());
+  EXPECT_DEATH_IF_SUPPORTED(std::cout << *poisoned_ptr, "");
+  EXPECT_DEATH_IF_SUPPORTED(std::cout << *(poisoned_ptr - 10), "");
+  EXPECT_DEATH_IF_SUPPORTED(std::cout << *(poisoned_ptr + 10), "");
+}
+
+}  // namespace
+}  // namespace base_internal
+ABSL_NAMESPACE_END
+}  // namespace absl