| // Copyright 2023 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef TOOLS_MEMORY_SIMULATOR_MEMORY_HOLDER_H_ |
| #define TOOLS_MEMORY_SIMULATOR_MEMORY_HOLDER_H_ |
| |
| #include <stdint.h> |
| |
| #include "base/rand_util.h" |
| |
| namespace memory_simulator { |
| |
| // Interface for a class that supports these operations: |
| // - Allocate a new memory page |
| // - Read the next memory page |
| // - Write the next memory page |
| class MemoryHolder { |
| public: |
| MemoryHolder(); |
| virtual ~MemoryHolder(); |
| |
| // Add a page filled with zeros to the "private footprint" of this process. |
| virtual void Allocate() = 0; |
| |
| // Read the next memory page. When the end is reached, goes back to the first |
| // page. No-ops if no page was allocated yet. |
| virtual void Read() = 0; |
| |
| // Writes to the next memory page. When the end is reached, goes back to the |
| // first page. No-ops if no page was allocated yet. |
| virtual void Write() = 0; |
| |
| protected: |
| // Returns a random number for use by Write() implementations. |
| uint64_t Rand(); |
| |
| private: |
| base::InsecureRandomGenerator random_generator_; |
| }; |
| |
| } // namespace memory_simulator |
| |
| #endif // TOOLS_MEMORY_SIMULATOR_MEMORY_HOLDER_H_ |