1 files changed, 106 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestAllocReplacement.cpp b/xpcom/tests/gtest/TestAllocReplacement.cpp
new file mode 100644
index 0000000000..4b2c41b0f3
--- /dev/null
+++ b/xpcom/tests/gtest/TestAllocReplacement.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozmemory.h"
+#include "gtest/gtest.h"
+
+// We want to ensure that various functions are hooked properly and that
+// allocations are getting routed through jemalloc.  The strategy
+// pursued below relies on jemalloc_info_ptr knowing about the pointers
+// returned by the allocator.  If the function has been hooked correctly,
+// then jemalloc_info_ptr returns a TagLiveAlloc tag, or TagUnknown
+// otherwise.
+// We could also check the hooking of |free| and similar functions: once
+// we free() the returned pointer, jemalloc_info_ptr would return a tag
+// that is not TagLiveAlloc. However, in the GTests environment, with
+// other threads running in the background, it is possible for some of
+// them to get a new allocation at the same location we just freed, and
+// jemalloc_info_ptr would return a TagLiveAlloc tag.
+
+#define ASSERT_ALLOCATION_HAPPENED(lambda) \
+  ASSERT_TRUE(ValidateHookedAllocation(lambda, free));
+
+// We do run the risk of OOM'ing when we allocate something...all we can
+// do is try to allocate something so small that OOM'ing is unlikely.
+const size_t kAllocAmount = 16;
+
+static bool ValidateHookedAllocation(void* (*aAllocator)(void),
+                                     void (*aFreeFunction)(void*)) {
+  void* p = aAllocator();
+
+  if (!p) {
+    return false;
+  }
+
+  jemalloc_ptr_info_t info;
+  jemalloc_ptr_info(p, &info);
+
+  // Regardless of whether that call succeeded or failed, we are done with
+  // the allocated buffer now.
+  aFreeFunction(p);
+
+  return (info.tag == PtrInfoTag::TagLiveAlloc);
+}
+
+TEST(AllocReplacement, malloc_check)
+{
+  ASSERT_ALLOCATION_HAPPENED([] { return malloc(kAllocAmount); });
+}
+
+TEST(AllocReplacement, calloc_check)
+{
+  ASSERT_ALLOCATION_HAPPENED([] { return calloc(1, kAllocAmount); });
+}
+
+TEST(AllocReplacement, realloc_check)
+{
+  ASSERT_ALLOCATION_HAPPENED([] { return realloc(nullptr, kAllocAmount); });
+}
+
+#if defined(HAVE_POSIX_MEMALIGN)
+TEST(AllocReplacement, posix_memalign_check)
+{
+  ASSERT_ALLOCATION_HAPPENED([] {
+    void* p = nullptr;
+    int result = posix_memalign(&p, sizeof(void*), kAllocAmount);
+    if (result != 0) {
+      return static_cast<void*>(nullptr);
+    }
+    return p;
+  });
+}
+#endif
+
+#if defined(XP_WIN)
+#  include <windows.h>
+
+#  undef ASSERT_ALLOCATION_HAPPENED
+#  define ASSERT_ALLOCATION_HAPPENED(lambda) \
+    ASSERT_TRUE(ValidateHookedAllocation(    \
+        lambda, [](void* p) { HeapFree(GetProcessHeap(), 0, p); }));
+
+TEST(AllocReplacement, HeapAlloc_check)
+{
+  ASSERT_ALLOCATION_HAPPENED([] {
+    HANDLE h = GetProcessHeap();
+    return HeapAlloc(h, 0, kAllocAmount);
+  });
+}
+
+TEST(AllocReplacement, HeapReAlloc_check)
+{
+  ASSERT_ALLOCATION_HAPPENED([] {
+    HANDLE h = GetProcessHeap();
+    void* p = HeapAlloc(h, 0, kAllocAmount / 2);
+
+    if (!p) {
+      return static_cast<void*>(nullptr);
+    }
+
+    return HeapReAlloc(h, 0, p, kAllocAmount);
+  });
+}
+#endif