import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

memory/volatile/tests/TestVolatileBuffer.cpp

@@ -0,0 +1,102 @@
+/* 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 "gtest/gtest.h"
+#include "mozilla/VolatileBuffer.h"
+#include <string.h>
+
+#if defined(ANDROID)
+#include <fcntl.h>
+#include <linux/ashmem.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#elif defined(XP_DARWIN)
+#include <mach/mach.h>
+#endif
+
+using namespace mozilla;
+
+TEST(VolatileBufferTest, HeapVolatileBuffersWork)
+{
+  RefPtr<VolatileBuffer> heapbuf = new VolatileBuffer();
+
+  ASSERT_TRUE(heapbuf) << "Failed to create VolatileBuffer";
+  ASSERT_TRUE(heapbuf->Init(512)) << "Failed to initialize VolatileBuffer";
+
+  VolatileBufferPtr<char> ptr(heapbuf);
+
+  EXPECT_FALSE(ptr.WasBufferPurged())
+    << "Buffer should not be purged immediately after initialization";
+  EXPECT_TRUE(ptr) << "Couldn't get pointer from VolatileBufferPtr";
+}
+
+TEST(VolatileBufferTest, RealVolatileBuffersWork)
+{
+  RefPtr<VolatileBuffer> buf = new VolatileBuffer();
+
+  ASSERT_TRUE(buf) << "Failed to create VolatileBuffer";
+  ASSERT_TRUE(buf->Init(16384)) << "Failed to initialize VolatileBuffer";
+
+  const char teststr[] = "foobar";
+
+  {
+    VolatileBufferPtr<char> ptr(buf);
+
+    EXPECT_FALSE(ptr.WasBufferPurged())
+      << "Buffer should not be purged immediately after initialization";
+    EXPECT_TRUE(ptr) << "Couldn't get pointer from VolatileBufferPtr";
+
+    {
+      VolatileBufferPtr<char> ptr2(buf);
+
+      EXPECT_FALSE(ptr.WasBufferPurged())
+        << "Failed to lock buffer again while currently locked";
+      ASSERT_TRUE(ptr2) << "Didn't get a pointer on the second lock";
+
+      strcpy(ptr2, teststr);
+    }
+  }
+
+  {
+    VolatileBufferPtr<char> ptr(buf);
+
+    EXPECT_FALSE(ptr.WasBufferPurged())
+      << "Buffer was immediately purged after unlock";
+    EXPECT_STREQ(ptr, teststr) << "Buffer failed to retain data after unlock";
+  }
+
+  // Test purging if we know how to
+#if defined(MOZ_WIDGET_GONK)
+  // This also works on Android, but we need root.
+  int fd = open("/" ASHMEM_NAME_DEF, O_RDWR);
+
+  ASSERT_GE(fd, 0) << "Failed to open ashmem device";
+  ASSERT_GE(ioctl(fd, ASHMEM_PURGE_ALL_CACHES, NULL), 0)
+    << "Failed to purge ashmem caches";
+#elif defined(XP_DARWIN)
+  int state;
+  vm_purgable_control(mach_task_self(), (vm_address_t)NULL,
+                      VM_PURGABLE_PURGE_ALL, &state);
+#else
+  return;
+#endif
+
+  EXPECT_GT(buf->NonHeapSizeOfExcludingThis(), 0ul)
+    << "Buffer should not be allocated on heap";
+
+  {
+    VolatileBufferPtr<char> ptr(buf);
+
+    EXPECT_TRUE(ptr.WasBufferPurged())
+      << "Buffer should not be unpurged after forced purge";
+    EXPECT_STRNE(ptr, teststr) << "Purge did not actually purge data";
+  }
+
+  {
+    VolatileBufferPtr<char> ptr(buf);
+
+    EXPECT_FALSE(ptr.WasBufferPurged()) << "Buffer still purged after lock";
+  }
+}