[cleanup] Introduce LsanPageAllocator decorator

... in order to avoid page allocator filtering when notifying leak sanitizer.

Bug: v8:8015
Change-Id: I2a3222030dbbf0c467808d0f397a064c40324189
Reviewed-on: https://chromium-review.googlesource.com/1216182Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55760}

BUILD.gn

@@ -3039,6 +3039,8 @@ v8_component("v8_libbase") {
     "src/base/list.h",
     "src/base/logging.cc",
     "src/base/logging.h",
+    "src/base/lsan-page-allocator.cc",
+    "src/base/lsan-page-allocator.h",
     "src/base/macros.h",
     "src/base/once.cc",
     "src/base/once.h",

src/allocation.cc

@@ -8,6 +8,7 @@
 #include "src/base/bits.h"
 #include "src/base/lazy-instance.h"
 #include "src/base/logging.h"
+#include "src/base/lsan-page-allocator.h"
 #include "src/base/page-allocator.h"
 #include "src/base/platform/platform.h"
 #include "src/utils.h"
@@ -17,10 +18,6 @@
 #include <malloc.h>  // NOLINT
 #endif
 
-#if defined(LEAK_SANITIZER)
-#include <sanitizer/lsan_interface.h>
-#endif
-
 namespace v8 {
 namespace internal {
 
@@ -51,6 +48,12 @@ struct InitializePageAllocator {
       static v8::base::PageAllocator default_allocator;
       page_allocator = &default_allocator;
     }
+#if defined(LEAK_SANITIZER)
+    {
+      static v8::base::LsanPageAllocator lsan_allocator(page_allocator);
+      page_allocator = &lsan_allocator;
+    }
+#endif
     *page_allocator_ptr = page_allocator;
   }
 };
@@ -160,13 +163,6 @@ void* AllocatePages(v8::PageAllocator* page_allocator, void* address,
     size_t request_size = size + alignment - page_allocator->AllocatePageSize();
     if (!OnCriticalMemoryPressure(request_size)) break;
   }
-#if defined(LEAK_SANITIZER)
-  if (result != nullptr && page_allocator == GetPlatformPageAllocator()) {
-    // Notify LSAN only about the plaform memory allocations or we will
-    // "allocate"/"deallocate" certain parts of memory twice.
-    __lsan_register_root_region(result, size);
-  }
-#endif
   return result;
 }
 
@@ -174,31 +170,14 @@ bool FreePages(v8::PageAllocator* page_allocator, void* address,
                const size_t size) {
   DCHECK_NOT_NULL(page_allocator);
   DCHECK_EQ(0UL, size & (page_allocator->AllocatePageSize() - 1));
-  bool result = page_allocator->FreePages(address, size);
-#if defined(LEAK_SANITIZER)
-  if (result && page_allocator == GetPlatformPageAllocator()) {
-    // Notify LSAN only about the plaform memory allocations or we will
-    // "allocate"/"deallocate" certain parts of memory twice.
-    __lsan_unregister_root_region(address, size);
-  }
-#endif
-  return result;
+  return page_allocator->FreePages(address, size);
 }
 
 bool ReleasePages(v8::PageAllocator* page_allocator, void* address, size_t size,
                   size_t new_size) {
   DCHECK_NOT_NULL(page_allocator);
   DCHECK_LT(new_size, size);
-  bool result = page_allocator->ReleasePages(address, size, new_size);
-#if defined(LEAK_SANITIZER)
-  if (result && page_allocator == GetPlatformPageAllocator()) {
-    // Notify LSAN only about the plaform memory allocations or we will
-    // "allocate"/"deallocate" certain parts of memory twice.
-    __lsan_unregister_root_region(address, size);
-    __lsan_register_root_region(address, new_size);
-  }
-#endif
-  return result;
+  return page_allocator->ReleasePages(address, size, new_size);
 }
 
 bool SetPermissions(v8::PageAllocator* page_allocator, void* address,

src/base/lsan-page-allocator.cc

+// Copyright 2018 the V8 project 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 "src/base/lsan-page-allocator.h"
+
+#include "src/base/logging.h"
+
+#if defined(LEAK_SANITIZER)
+#include <sanitizer/lsan_interface.h>
+#endif
+
+namespace v8 {
+namespace base {
+
+LsanPageAllocator::LsanPageAllocator(v8::PageAllocator* page_allocator)
+    : page_allocator_(page_allocator),
+      allocate_page_size_(page_allocator_->AllocatePageSize()),
+      commit_page_size_(page_allocator_->CommitPageSize()) {
+  DCHECK_NOT_NULL(page_allocator);
+}
+
+void* LsanPageAllocator::AllocatePages(void* address, size_t size,
+                                       size_t alignment,
+                                       PageAllocator::Permission access) {
+  void* result =
+      page_allocator_->AllocatePages(address, size, alignment, access);
+#if defined(LEAK_SANITIZER)
+  if (result != nullptr) {
+    __lsan_register_root_region(result, size);
+  }
+#endif
+  return result;
+}
+
+bool LsanPageAllocator::FreePages(void* address, size_t size) {
+  bool result = page_allocator_->FreePages(address, size);
+#if defined(LEAK_SANITIZER)
+  if (result) {
+    __lsan_unregister_root_region(address, size);
+  }
+#endif
+  return result;
+}
+
+bool LsanPageAllocator::ReleasePages(void* address, size_t size,
+                                     size_t new_size) {
+  bool result = page_allocator_->ReleasePages(address, size, new_size);
+#if defined(LEAK_SANITIZER)
+  if (result) {
+    __lsan_unregister_root_region(address, size);
+    __lsan_register_root_region(address, new_size);
+  }
+#endif
+  return result;
+}
+
+}  // namespace base
+}  // namespace v8

src/base/lsan-page-allocator.h

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_BASE_LSAN_PAGE_ALLOCATOR_H_
+#define V8_BASE_LSAN_PAGE_ALLOCATOR_H_
+
+#include "include/v8-platform.h"
+#include "src/base/base-export.h"
+#include "src/base/compiler-specific.h"
+
+namespace v8 {
+namespace base {
+
+// This is a v8::PageAllocator implementation that decorates provided page
+// allocator object with leak sanitizer notifications when LEAK_SANITIZER
+// is defined.
+class V8_BASE_EXPORT LsanPageAllocator
+    : public NON_EXPORTED_BASE(::v8::PageAllocator) {
+ public:
+  LsanPageAllocator(v8::PageAllocator* page_allocator);
+  virtual ~LsanPageAllocator() = default;
+
+  size_t AllocatePageSize() override { return allocate_page_size_; }
+
+  size_t CommitPageSize() override { return commit_page_size_; }
+
+  void SetRandomMmapSeed(int64_t seed) override {
+    return page_allocator_->SetRandomMmapSeed(seed);
+  }
+
+  void* GetRandomMmapAddr() override {
+    return page_allocator_->GetRandomMmapAddr();
+  }
+
+  void* AllocatePages(void* address, size_t size, size_t alignment,
+                      PageAllocator::Permission access) override;
+
+  bool FreePages(void* address, size_t size) override;
+
+  bool ReleasePages(void* address, size_t size, size_t new_size) override;
+
+  bool SetPermissions(void* address, size_t size,
+                      PageAllocator::Permission access) override {
+    return page_allocator_->SetPermissions(address, size, access);
+  }
+
+ private:
+  v8::PageAllocator* const page_allocator_;
+  const size_t allocate_page_size_;
+  const size_t commit_page_size_;
+};
+
+}  // namespace base
+}  // namespace v8
+#endif  // V8_BASE_LSAN_PAGE_ALLOCATOR_H_