gin/v8_platform_page_allocator.h

   1 // Copyright 2021 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GIN_V8_PLATFORM_PAGE_ALLOCATOR_H_
   6 #define GIN_V8_PLATFORM_PAGE_ALLOCATOR_H_
   7
   8 #include "build/build_config.h"
   9 #include "build/buildflag.h"
  10
  11 #include "base/allocator/partition_allocator/src/partition_alloc/partition_alloc_buildflags.h"
  12
  13 #if BUILDFLAG(USE_PARTITION_ALLOC)
  14
  15 #include "base/allocator/partition_allocator/src/partition_alloc/page_allocator.h"
  16 #include "gin/gin_export.h"
  17 #include "v8/include/v8-platform.h"
  18
  19 namespace gin {
  20
  21 // A v8::PageAllocator implementation to use with gin.
  22 class GIN_EXPORT PageAllocator final : public v8::PageAllocator {
  23  public:
  24   ~PageAllocator() override;
  25
  26   size_t AllocatePageSize() override;
  27
  28   size_t CommitPageSize() override;
  29
  30   void SetRandomMmapSeed(int64_t seed) override;
  31
  32   void* GetRandomMmapAddr() override;
  33
  34   void* AllocatePages(void* address,
  35                       size_t length,
  36                       size_t alignment,
  37                       v8::PageAllocator::Permission permissions) override;
  38
  39   bool FreePages(void* address, size_t length) override;
  40
  41   bool ReleasePages(void* address, size_t length, size_t new_length) override;
  42
  43   bool SetPermissions(void* address,
  44                       size_t length,
  45                       Permission permissions) override;
  46
  47   bool RecommitPages(void* address,
  48                      size_t length,
  49                      Permission permissions) override;
  50
  51   bool DiscardSystemPages(void* address, size_t size) override;
  52
  53   bool DecommitPages(void* address, size_t size) override;
  54
  55   // For testing purposes only: Map the v8 page permissions into a page
  56   // configuration from base.
  57   ::partition_alloc::PageAccessibilityConfiguration::Permissions
  58   GetPageConfigPermissionsForTesting(v8::PageAllocator::Permission permission);
  59 };
  60 }  // namespace gin
  61
  62 #endif  // BUILDFLAG(USE_PARTITION_ALLOC)
  63
  64 #endif  // GIN_V8_PLATFORM_PAGE_ALLOCATOR_H_