Line data    Source code

       1             : // Copyright 2017 the V8 project authors. All rights reserved.
       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 V8_BASE_PAGE_ALLOCATOR_H_
       6             : #define V8_BASE_PAGE_ALLOCATOR_H_
       7             : 
       8             : #include "include/v8-platform.h"
       9             : #include "src/base/base-export.h"
      10             : #include "src/base/compiler-specific.h"
      11             : 
      12             : namespace v8 {
      13             : namespace base {
      14             : 
      15             : class V8_BASE_EXPORT PageAllocator
      16             :     : public NON_EXPORTED_BASE(::v8::PageAllocator) {
      17             :  public:
      18             :   PageAllocator();
      19      115872 :   ~PageAllocator() override = default;
      20             : 
      21    10474349 :   size_t AllocatePageSize() override { return allocate_page_size_; }
      22             : 
      23    26807774 :   size_t CommitPageSize() override { return commit_page_size_; }
      24             : 
      25             :   void SetRandomMmapSeed(int64_t seed) override;
      26             : 
      27             :   void* GetRandomMmapAddr() override;
      28             : 
      29             :   void* AllocatePages(void* address, size_t size, size_t alignment,
      30             :                       PageAllocator::Permission access) override;
      31             : 
      32             :   bool FreePages(void* address, size_t size) override;
      33             : 
      34             :   bool ReleasePages(void* address, size_t size, size_t new_size) override;
      35             : 
      36             :   bool SetPermissions(void* address, size_t size,
      37             :                       PageAllocator::Permission access) override;
      38             : 
      39             :   bool DiscardSystemPages(void* address, size_t size) override;
      40             : 
      41             :  private:
      42             :   const size_t allocate_page_size_;
      43             :   const size_t commit_page_size_;
      44             : };
      45             : 
      46             : }  // namespace base
      47             : }  // namespace v8
      48             : #endif  // V8_BASE_PAGE_ALLOCATOR_H_