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/inspect/mc_unw.hpp"
11 #include "src/mc/remote/RemoteClient.hpp"
12 #include "src/mc/sosp/RegionSnapshot.hpp"
14 // ***** Snapshot region
16 static XBT_ALWAYS_INLINE void* mc_translate_address_region_chunked(uintptr_t addr, simgrid::mc::RegionSnapshot* region)
18 auto split = simgrid::mc::mmu::split(addr - region->start().address());
19 auto pageno = split.first;
20 auto offset = split.second;
21 const void* snapshot_page = region->page_data().page(pageno);
22 return (char*)snapshot_page + offset;
25 static XBT_ALWAYS_INLINE void* mc_translate_address_region(uintptr_t addr, simgrid::mc::RegionSnapshot* region)
27 switch (region->storage_type()) {
28 case simgrid::mc::StorageType::Flat: {
29 uintptr_t offset = (uintptr_t)addr - (uintptr_t)region->start().address();
30 return (void*)((uintptr_t)region->flat_data().get() + offset);
32 case simgrid::mc::StorageType::Chunked:
33 return mc_translate_address_region_chunked(addr, region);
34 default: // includes StorageType::NoData
35 xbt_die("Storage type not supported");
43 * Some parts of the snapshot are ignored by zeroing them out: the real
44 * values is stored here.
46 struct s_mc_snapshot_ignored_data_t {
48 std::vector<char> data;
51 /** Information about a given stack frame */
52 struct s_mc_stack_frame_t {
53 /** Instruction pointer */
57 unw_word_t frame_base;
58 simgrid::mc::Frame* frame;
59 std::string frame_name;
60 unw_cursor_t unw_cursor;
62 typedef s_mc_stack_frame_t* mc_stack_frame_t;
64 struct s_local_variable_t {
65 simgrid::mc::Frame* subprogram;
68 simgrid::mc::Type* type;
71 typedef s_local_variable_t* local_variable_t;
73 struct XBT_PRIVATE s_mc_snapshot_stack_t {
74 std::vector<s_local_variable_t> local_variables;
75 simgrid::mc::UnwindContext context;
76 std::vector<s_mc_stack_frame_t> stack_frames;
78 typedef s_mc_snapshot_stack_t* mc_snapshot_stack_t;
83 class XBT_PRIVATE Snapshot final : public AddressSpace {
85 Snapshot(int num_state, RemoteClient* process = &mc_model_checker->process());
86 ~Snapshot() = default;
91 const void* read_bytes(void* buffer, std::size_t size, RemotePtr<void> address,
92 ReadOptions options = ReadOptions::none()) const override;
93 RegionSnapshot* get_region(const void* addr) const;
94 RegionSnapshot* get_region(const void* addr, RegionSnapshot* hinted_region) const;
95 void restore(RemoteClient* process);
99 std::size_t heap_bytes_used_;
100 std::vector<std::unique_ptr<RegionSnapshot>> snapshot_regions_;
101 std::set<pid_t> enabled_processes_;
102 std::vector<std::size_t> stack_sizes_;
103 std::vector<s_mc_snapshot_stack_t> stacks_;
104 std::vector<simgrid::mc::IgnoredHeapRegion> to_ignore_;
105 std::uint64_t hash_ = 0;
106 std::vector<s_mc_snapshot_ignored_data_t> ignored_data_;
109 void add_region(RegionType type, ObjectInformation* object_info, void* start_addr, void* permanent_addr,
111 void snapshot_regions(simgrid::mc::RemoteClient* process);
112 void snapshot_stacks(simgrid::mc::RemoteClient* process);
115 } // namespace simgrid
117 static const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot);
122 XBT_PRIVATE std::shared_ptr<Snapshot> take_snapshot(int num_state);
124 } // namespace simgrid
126 const void* MC_region_read_fragmented(simgrid::mc::RegionSnapshot* region, void* target, const void* addr,
129 int MC_snapshot_region_memcmp(const void* addr1, simgrid::mc::RegionSnapshot* region1, const void* addr2,
130 simgrid::mc::RegionSnapshot* region2, std::size_t size);
132 static XBT_ALWAYS_INLINE const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot)
134 if (snapshot == nullptr)
135 xbt_die("snapshot is nullptr");
136 return mc_model_checker->process().get_heap()->breakval;
139 /** @brief Read memory from a snapshot region
141 * @param addr Process (non-snapshot) address of the data
142 * @param region Snapshot memory region where the data is located
143 * @param target Buffer to store the value
144 * @param size Size of the data to read in bytes
145 * @return Pointer where the data is located (target buffer of original location)
147 static XBT_ALWAYS_INLINE const void* MC_region_read(simgrid::mc::RegionSnapshot* region, void* target, const void* addr,
152 std::uintptr_t offset = (std::uintptr_t)addr - (std::uintptr_t)region->start().address();
154 xbt_assert(region->contain(simgrid::mc::remote(addr)), "Trying to read out of the region boundary.");
156 switch (region->storage_type()) {
157 case simgrid::mc::StorageType::Flat:
158 return (char*)region->flat_data().get() + offset;
160 case simgrid::mc::StorageType::Chunked: {
161 // Last byte of the region:
162 void* end = (char*)addr + size - 1;
163 if (simgrid::mc::mmu::same_chunk((std::uintptr_t)addr, (std::uintptr_t)end)) {
164 // The memory is contained in a single page:
165 return mc_translate_address_region_chunked((uintptr_t)addr, region);
167 // Otherwise, the memory spans several pages:
168 return MC_region_read_fragmented(region, target, addr, size);
172 xbt_die("StorageType::NoData not supported");
176 static XBT_ALWAYS_INLINE void* MC_region_read_pointer(simgrid::mc::RegionSnapshot* region, const void* addr)
179 return *(void**)MC_region_read(region, &res, addr, sizeof(void*));