1 /* Copyright (c) 2007-2023. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_MC_SOSP_REGION_HPP
7 #define SIMGRID_MC_SOSP_REGION_HPP
9 #include "src/mc/remote/RemotePtr.hpp"
10 #include "src/mc/sosp/ChunkedData.hpp"
15 namespace simgrid::mc {
17 enum class RegionType { Heap = 1, Data = 2 };
19 /** A copy/snapshot of a given memory region, where identical pages are stored only once */
22 static const RegionType HeapRegion = RegionType::Heap;
23 static const RegionType DataRegion = RegionType::Data;
26 RegionType region_type_;
27 simgrid::mc::ObjectInformation* object_info_ = nullptr;
29 /** @brief Virtual address of the region in the simulated process */
30 void* start_addr_ = nullptr;
32 /** @brief Size of the data region in bytes */
33 std::size_t size_ = 0;
38 Region(PageStore& store, const RemoteProcessMemory& memory, RegionType type, void* start_addr, size_t size);
39 Region(Region const&) = delete;
40 Region& operator=(Region const&) = delete;
41 Region(Region&& that) = delete;
42 Region& operator=(Region&& that) = delete;
46 ChunkedData const& get_chunks() const { return chunks_; }
48 simgrid::mc::ObjectInformation* object_info() const { return object_info_; }
49 void object_info(simgrid::mc::ObjectInformation* info) { object_info_ = info; }
53 RemotePtr<void> start() const { return remote(start_addr_); }
54 RemotePtr<void> end() const { return remote((char*)start_addr_ + size_); }
55 std::size_t size() const { return size_; }
56 RegionType region_type() const { return region_type_; }
58 bool contain(RemotePtr<void> p) const { return p >= start() && p < end(); }
60 /** @brief Restore a region from a snapshot */
61 void restore(const RemoteProcessMemory& memory) const;
63 /** @brief Read memory that was snapshotted in this region
65 * @param target Buffer to store contiguously the value if it spans over several pages
66 * @param addr Process (non-snapshot) address of the data
67 * @param size Size of the data to read in bytes
68 * @return Pointer where the data is located (either target buffer or original location)
70 void* read(void* target, const void* addr, std::size_t size) const;
73 } // namespace simgrid::mc
75 int MC_snapshot_region_memcmp(const void* addr1, const simgrid::mc::Region* region1, const void* addr2,
76 const simgrid::mc::Region* region2, std::size_t size);
78 static XBT_ALWAYS_INLINE void* MC_region_read_pointer(const simgrid::mc::Region* region, const void* addr)
81 return *(void**)region->read(&res, addr, sizeof(void*));