1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/base/allocator/partition_allocator/partition_root_base.cc b/third_party/base/allocator/partition_allocator/partition_root_base.cc
new file mode 100644
index 0000000000..313658419a
--- /dev/null
+++ b/third_party/base/allocator/partition_allocator/partition_root_base.cc
@@ -0,0 +1,42 @@
+// Copyright (c) 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "third_party/base/allocator/partition_allocator/partition_root_base.h"
+
+#include "build/build_config.h"
+#include "third_party/base/allocator/partition_allocator/oom.h"
+#include "third_party/base/allocator/partition_allocator/partition_oom.h"
+#include "third_party/base/allocator/partition_allocator/partition_page.h"
+
+namespace pdfium {
+namespace base {
+namespace internal {
+
+NOINLINE void PartitionRootBase::OutOfMemory() {
+#if !defined(ARCH_CPU_64_BITS)
+  // Check whether this OOM is due to a lot of super pages that are allocated
+  // but not committed, probably due to http://crbug.com/421387.
+  if (total_size_of_super_pages + total_size_of_direct_mapped_pages -
+          total_size_of_committed_pages >
+      kReasonableSizeOfUnusedPages) {
+    PartitionOutOfMemoryWithLotsOfUncommitedPages();
+  }
+#endif
+  if (PartitionRootBase::gOomHandlingFunction)
+    (*PartitionRootBase::gOomHandlingFunction)();
+  OOM_CRASH();
+}
+
+void PartitionRootBase::DecommitEmptyPages() {
+  for (size_t i = 0; i < kMaxFreeableSpans; ++i) {
+    internal::PartitionPage* page = global_empty_page_ring[i];
+    if (page)
+      page->DecommitIfPossible(this);
+    global_empty_page_ring[i] = nullptr;
+  }
+}
+
+}  // namespace internal
+}  // namespace base
+}  // namespace pdfium