1 /* Copyright (c) 2007-2017. 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_H
7 #define SIMGRID_MC_SNAPSHOT_H
14 #include "src/mc/ModelChecker.hpp"
15 #include "src/mc/RegionSnapshot.hpp"
16 #include "src/mc/mc_forward.hpp"
17 #include "src/mc/mc_unw.h"
21 // ***** Snapshot region
23 XBT_PRIVATE void mc_region_restore_sparse(simgrid::mc::RemoteClient* process, mc_mem_region_t reg);
25 static XBT_ALWAYS_INLINE void* mc_translate_address_region_chunked(uintptr_t addr, mc_mem_region_t region)
27 auto split = simgrid::mc::mmu::split(addr - region->start().address());
28 auto pageno = split.first;
29 auto offset = split.second;
30 const void* snapshot_page = region->page_data().page(pageno);
31 return (char*) snapshot_page + offset;
34 static XBT_ALWAYS_INLINE void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region, int process_index)
36 switch (region->storage_type()) {
37 case simgrid::mc::StorageType::NoData:
39 xbt_die("Storage type not supported");
41 case simgrid::mc::StorageType::Flat:
43 uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start().address();
44 return (void *) ((uintptr_t) region->flat_data().get() + offset);
47 case simgrid::mc::StorageType::Chunked:
48 return mc_translate_address_region_chunked(addr, region);
50 case simgrid::mc::StorageType::Privatized:
52 xbt_assert(process_index >=0,
53 "Missing process index for privatized region");
54 xbt_assert((size_t) process_index < region->privatized_data().size(),
55 "Out of range process index");
56 simgrid::mc::RegionSnapshot& subregion= region->privatized_data()[process_index];
57 return mc_translate_address_region(addr, &subregion, process_index);
62 XBT_PRIVATE mc_mem_region_t mc_get_snapshot_region(
63 const void* addr, const simgrid::mc::Snapshot *snapshot, int process_index);
71 * Some parts of the snapshot are ignored by zeroing them out: the real
72 * values is stored here.
74 typedef struct s_mc_snapshot_ignored_data {
76 std::vector<char> data;
77 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
79 typedef struct s_fd_infos{
82 off_t current_position;
84 }s_fd_infos_t, *fd_infos_t;
86 /** Information about a given stack frame
89 typedef struct s_mc_stack_frame {
90 /** Instruction pointer */
94 unw_word_t frame_base;
95 simgrid::mc::Frame* frame;
96 std::string frame_name;
97 unw_cursor_t unw_cursor;
98 } s_mc_stack_frame_t, *mc_stack_frame_t;
100 typedef struct s_local_variable{
101 simgrid::mc::Frame* subprogram;
104 simgrid::mc::Type* type;
107 } s_local_variable_t, *local_variable_t;
109 typedef struct XBT_PRIVATE s_mc_snapshot_stack {
110 std::vector<s_local_variable> local_variables;
111 simgrid::mc::UnwindContext context;
112 std::vector<s_mc_stack_frame_t> stack_frames;
114 } s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
119 class XBT_PRIVATE Snapshot final : public AddressSpace {
121 Snapshot(RemoteClient* process, int num_state);
122 ~Snapshot() = default;
123 const void* read_bytes(void* buffer, std::size_t size,
124 RemotePtr<void> address, int process_index = ProcessIndexAny,
125 ReadOptions options = ReadOptions::none()) const override;
126 public: // To be private
128 std::size_t heap_bytes_used;
129 std::vector<std::unique_ptr<s_mc_mem_region_t>> snapshot_regions;
130 std::set<pid_t> enabled_processes;
131 int privatization_index;
132 std::vector<std::size_t> stack_sizes;
133 std::vector<s_mc_snapshot_stack_t> stacks;
134 std::vector<simgrid::mc::IgnoredHeapRegion> to_ignore;
136 std::vector<s_mc_snapshot_ignored_data> ignored_data;
137 std::vector<s_fd_infos_t> current_fds;
145 static XBT_ALWAYS_INLINE mc_mem_region_t mc_get_region_hinted(void* addr, simgrid::mc::Snapshot* snapshot,
146 int process_index, mc_mem_region_t region)
148 if (region->contain(simgrid::mc::remote(addr)))
151 return mc_get_snapshot_region(addr, snapshot, process_index);
154 static const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot);
163 XBT_PRIVATE std::shared_ptr<simgrid::mc::Snapshot> take_snapshot(int num_state);
164 XBT_PRIVATE void restore_snapshot(std::shared_ptr<simgrid::mc::Snapshot> snapshot);
173 XBT_PRIVATE void mc_restore_page_snapshot_region(simgrid::mc::RemoteClient* process, void* start_addr,
174 simgrid::mc::ChunkedData const& pagenos);
176 const void* MC_region_read_fragmented(
177 mc_mem_region_t region, void* target, const void* addr, std::size_t size);
179 int MC_snapshot_region_memcmp(
180 const void* addr1, mc_mem_region_t region1,
181 const void* addr2, mc_mem_region_t region2, std::size_t size);
182 XBT_PRIVATE int MC_snapshot_memcmp(
183 const void* addr1, simgrid::mc::Snapshot* snapshot1,
184 const void* addr2, simgrid::mc::Snapshot* snapshot2, int process_index, std::size_t size);
186 static XBT_ALWAYS_INLINE const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot)
188 if(snapshot==nullptr)
189 xbt_die("snapshot is nullptr");
190 return mc_model_checker->process().get_heap()->breakval;
193 /** @brief Read memory from a snapshot region
195 * @param addr Process (non-snapshot) address of the data
196 * @param region Snapshot memory region where the data is located
197 * @param target Buffer to store the value
198 * @param size Size of the data to read in bytes
199 * @return Pointer where the data is located (target buffer of original location)
201 static XBT_ALWAYS_INLINE const void* MC_region_read(mc_mem_region_t region, void* target, const void* addr,
206 std::uintptr_t offset = (std::uintptr_t)addr - (std::uintptr_t)region->start().address();
208 xbt_assert(region->contain(simgrid::mc::remote(addr)), "Trying to read out of the region boundary.");
210 switch (region->storage_type()) {
211 case simgrid::mc::StorageType::NoData:
213 xbt_die("Storage type not supported");
215 case simgrid::mc::StorageType::Flat:
216 return (char*) region->flat_data().get() + offset;
218 case simgrid::mc::StorageType::Chunked:
220 // Last byte of the region:
221 void* end = (char*) addr + size - 1;
222 if (simgrid::mc::mmu::sameChunk((std::uintptr_t) addr, (std::uintptr_t) end) ) {
223 // The memory is contained in a single page:
224 return mc_translate_address_region_chunked((uintptr_t) addr, region);
226 // The memory spans several pages:
227 return MC_region_read_fragmented(region, target, addr, size);
231 // We currently do not pass the process_index to this function so we assume
232 // that the privatized region has been resolved in the callers:
233 case simgrid::mc::StorageType::Privatized:
234 xbt_die("Storage type not supported");
238 static XBT_ALWAYS_INLINE void* MC_region_read_pointer(mc_mem_region_t region, const void* addr)
241 return *(void**) MC_region_read(region, &res, addr, sizeof(void*));