1 /* Copyright (c) 2007-2019. 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_SNAPSHOT_HPP
7 #define SIMGRID_MC_SNAPSHOT_HPP
9 #include "src/mc/ModelChecker.hpp"
10 #include "src/mc/mc_unw.hpp"
11 #include "src/mc/remote/RemoteClient.hpp"
12 #include "src/mc/sosp/RegionSnapshot.hpp"
14 // ***** Snapshot region
16 XBT_PRIVATE void mc_region_restore_sparse(simgrid::mc::RemoteClient* process, simgrid::mc::RegionSnapshot* reg);
18 static XBT_ALWAYS_INLINE void* mc_translate_address_region_chunked(uintptr_t addr, simgrid::mc::RegionSnapshot* region)
20 auto split = simgrid::mc::mmu::split(addr - region->start().address());
21 auto pageno = split.first;
22 auto offset = split.second;
23 const void* snapshot_page = region->page_data().page(pageno);
24 return (char*)snapshot_page + offset;
27 static XBT_ALWAYS_INLINE void* mc_translate_address_region(uintptr_t addr, simgrid::mc::RegionSnapshot* region,
30 switch (region->storage_type()) {
31 case simgrid::mc::StorageType::Flat: {
32 uintptr_t offset = (uintptr_t)addr - (uintptr_t)region->start().address();
33 return (void*)((uintptr_t)region->flat_data().get() + offset);
35 case simgrid::mc::StorageType::Chunked:
36 return mc_translate_address_region_chunked(addr, region);
37 case simgrid::mc::StorageType::Privatized: {
38 xbt_assert(process_index >= 0, "Missing process index for privatized region");
39 xbt_assert((size_t)process_index < region->privatized_data().size(), "Out of range process index");
40 simgrid::mc::RegionSnapshot& subregion = region->privatized_data()[process_index];
41 return mc_translate_address_region(addr, &subregion, process_index);
43 default: // includes StorageType::NoData
44 xbt_die("Storage type not supported");
48 XBT_PRIVATE simgrid::mc::RegionSnapshot* mc_get_snapshot_region(const void* addr, const simgrid::mc::Snapshot* snapshot,
55 * Some parts of the snapshot are ignored by zeroing them out: the real
56 * values is stored here.
58 struct s_mc_snapshot_ignored_data_t {
60 std::vector<char> data;
63 /** Information about a given stack frame */
64 struct s_mc_stack_frame_t {
65 /** Instruction pointer */
69 unw_word_t frame_base;
70 simgrid::mc::Frame* frame;
71 std::string frame_name;
72 unw_cursor_t unw_cursor;
74 typedef s_mc_stack_frame_t* mc_stack_frame_t;
76 struct s_local_variable_t {
77 simgrid::mc::Frame* subprogram;
80 simgrid::mc::Type* type;
84 typedef s_local_variable_t* local_variable_t;
86 struct XBT_PRIVATE s_mc_snapshot_stack_t {
87 std::vector<s_local_variable_t> local_variables;
88 simgrid::mc::UnwindContext context;
89 std::vector<s_mc_stack_frame_t> stack_frames;
92 typedef s_mc_snapshot_stack_t* mc_snapshot_stack_t;
97 class XBT_PRIVATE Snapshot final : public AddressSpace {
99 Snapshot(RemoteClient* process, int num_state);
100 ~Snapshot() = default;
101 const void* read_bytes(void* buffer, std::size_t size, RemotePtr<void> address, int process_index = ProcessIndexAny,
102 ReadOptions options = ReadOptions::none()) const override;
106 std::size_t heap_bytes_used;
107 std::vector<std::unique_ptr<RegionSnapshot>> snapshot_regions;
108 std::set<pid_t> enabled_processes;
109 int privatization_index;
110 std::vector<std::size_t> stack_sizes;
111 std::vector<s_mc_snapshot_stack_t> stacks;
112 std::vector<simgrid::mc::IgnoredHeapRegion> to_ignore;
114 std::vector<s_mc_snapshot_ignored_data_t> ignored_data;
117 } // namespace simgrid
119 static XBT_ALWAYS_INLINE simgrid::mc::RegionSnapshot* mc_get_region_hinted(void* addr, simgrid::mc::Snapshot* snapshot,
121 simgrid::mc::RegionSnapshot* region)
123 if (region->contain(simgrid::mc::remote(addr)))
126 return mc_get_snapshot_region(addr, snapshot, process_index);
129 static const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot);
134 XBT_PRIVATE std::shared_ptr<Snapshot> take_snapshot(int num_state);
135 XBT_PRIVATE void restore_snapshot(std::shared_ptr<Snapshot> snapshot);
137 } // namespace simgrid
139 XBT_PRIVATE void mc_restore_page_snapshot_region(simgrid::mc::RemoteClient* process, void* start_addr,
140 simgrid::mc::ChunkedData const& pagenos);
142 const void* MC_region_read_fragmented(simgrid::mc::RegionSnapshot* region, void* target, const void* addr,
145 int MC_snapshot_region_memcmp(const void* addr1, simgrid::mc::RegionSnapshot* region1, const void* addr2,
146 simgrid::mc::RegionSnapshot* region2, std::size_t size);
148 static XBT_ALWAYS_INLINE const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot)
150 if (snapshot == nullptr)
151 xbt_die("snapshot is nullptr");
152 return mc_model_checker->process().get_heap()->breakval;
155 /** @brief Read memory from a snapshot region
157 * @param addr Process (non-snapshot) address of the data
158 * @param region Snapshot memory region where the data is located
159 * @param target Buffer to store the value
160 * @param size Size of the data to read in bytes
161 * @return Pointer where the data is located (target buffer of original location)
163 static XBT_ALWAYS_INLINE const void* MC_region_read(simgrid::mc::RegionSnapshot* region, void* target, const void* addr,
168 std::uintptr_t offset = (std::uintptr_t)addr - (std::uintptr_t)region->start().address();
170 xbt_assert(region->contain(simgrid::mc::remote(addr)), "Trying to read out of the region boundary.");
172 switch (region->storage_type()) {
173 case simgrid::mc::StorageType::Flat:
174 return (char*)region->flat_data().get() + offset;
176 case simgrid::mc::StorageType::Chunked: {
177 // Last byte of the region:
178 void* end = (char*)addr + size - 1;
179 if (simgrid::mc::mmu::sameChunk((std::uintptr_t)addr, (std::uintptr_t)end)) {
180 // The memory is contained in a single page:
181 return mc_translate_address_region_chunked((uintptr_t)addr, region);
183 // Otherwise, the memory spans several pages:
184 return MC_region_read_fragmented(region, target, addr, size);
188 // includes StorageType::NoData and StorageType::Privatized (we currently do not pass the process_index to this
189 // function so we assume that the privatized region has been resolved in the callers)
190 xbt_die("Storage type not supported");
194 static XBT_ALWAYS_INLINE void* MC_region_read_pointer(simgrid::mc::RegionSnapshot* region, const void* addr)
197 return *(void**)MC_region_read(region, &res, addr, sizeof(void*));