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
17 #include <sys/types.h> // off_t
19 #include "src/xbt/mmalloc/mmprivate.h"
20 #include <xbt/asserts.h>
23 #include "src/mc/mc_forward.hpp"
24 #include "src/mc/ModelChecker.hpp"
25 #include "src/mc/PageStore.hpp"
26 #include "src/mc/AddressSpace.hpp"
27 #include "src/mc/mc_unw.h"
28 #include "src/mc/RegionSnapshot.hpp"
32 // ***** Snapshot region
34 XBT_PRIVATE void mc_region_restore_sparse(simgrid::mc::Process* process, mc_mem_region_t reg);
36 static XBT_ALWAYS_INLINE void* mc_translate_address_region_chunked(uintptr_t addr, mc_mem_region_t region)
38 auto split = simgrid::mc::mmu::split(addr - region->start().address());
39 auto pageno = split.first;
40 auto offset = split.second;
41 const void* snapshot_page = region->page_data().page(pageno);
42 return (char*) snapshot_page + offset;
45 static XBT_ALWAYS_INLINE void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region, int process_index)
47 switch (region->storage_type()) {
48 case simgrid::mc::StorageType::NoData:
50 xbt_die("Storage type not supported");
52 case simgrid::mc::StorageType::Flat:
54 uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start().address();
55 return (void *) ((uintptr_t) region->flat_data().get() + offset);
58 case simgrid::mc::StorageType::Chunked:
59 return mc_translate_address_region_chunked(addr, region);
61 case simgrid::mc::StorageType::Privatized:
63 xbt_assert(process_index >=0,
64 "Missing process index for privatized region");
65 xbt_assert((size_t) process_index < region->privatized_data().size(),
66 "Out of range process index");
67 simgrid::mc::RegionSnapshot& subregion= region->privatized_data()[process_index];
68 return mc_translate_address_region(addr, &subregion, process_index);
73 XBT_PRIVATE mc_mem_region_t mc_get_snapshot_region(
74 const void* addr, const simgrid::mc::Snapshot *snapshot, int process_index);
82 * Some parts of the snapshot are ignored by zeroing them out: the real
83 * values is stored here.
85 typedef struct s_mc_snapshot_ignored_data {
87 std::vector<char> data;
88 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
90 typedef struct s_fd_infos{
93 off_t current_position;
95 }s_fd_infos_t, *fd_infos_t;
97 /** Information about a given stack frame
100 typedef struct s_mc_stack_frame {
101 /** Instruction pointer */
105 unw_word_t frame_base;
106 simgrid::mc::Frame* frame;
107 std::string frame_name;
108 unw_cursor_t unw_cursor;
109 } s_mc_stack_frame_t, *mc_stack_frame_t;
111 typedef struct s_local_variable{
112 simgrid::mc::Frame* subprogram;
115 simgrid::mc::Type* type;
118 } s_local_variable_t, *local_variable_t;
120 typedef struct XBT_PRIVATE s_mc_snapshot_stack {
121 std::vector<s_local_variable> local_variables;
122 simgrid::mc::UnwindContext context;
123 std::vector<s_mc_stack_frame_t> stack_frames;
125 } s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
130 class XBT_PRIVATE Snapshot final : public AddressSpace {
132 Snapshot(Process* process, int num_state);
133 ~Snapshot() = default;
134 const void* read_bytes(void* buffer, std::size_t size,
135 RemotePtr<void> address, int process_index = ProcessIndexAny,
136 ReadOptions options = ReadOptions::none()) const override;
137 public: // To be private
139 std::size_t heap_bytes_used;
140 std::vector<std::unique_ptr<s_mc_mem_region_t>> snapshot_regions;
141 std::set<pid_t> enabled_processes;
142 int privatization_index;
143 std::vector<std::size_t> stack_sizes;
144 std::vector<s_mc_snapshot_stack_t> stacks;
145 std::vector<simgrid::mc::IgnoredHeapRegion> to_ignore;
147 std::vector<s_mc_snapshot_ignored_data> ignored_data;
148 std::vector<s_fd_infos_t> current_fds;
156 static XBT_ALWAYS_INLINE mc_mem_region_t mc_get_region_hinted(void* addr, simgrid::mc::Snapshot* snapshot,
157 int process_index, mc_mem_region_t region)
159 if (region->contain(simgrid::mc::remote(addr)))
162 return mc_get_snapshot_region(addr, snapshot, process_index);
165 static const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot);
174 XBT_PRIVATE std::shared_ptr<simgrid::mc::Snapshot> take_snapshot(int num_state);
175 XBT_PRIVATE void restore_snapshot(std::shared_ptr<simgrid::mc::Snapshot> snapshot);
184 XBT_PRIVATE void mc_restore_page_snapshot_region(
185 simgrid::mc::Process* process,
186 void* start_addr, simgrid::mc::ChunkedData const& pagenos);
188 const void* MC_region_read_fragmented(
189 mc_mem_region_t region, void* target, const void* addr, std::size_t size);
191 int MC_snapshot_region_memcmp(
192 const void* addr1, mc_mem_region_t region1,
193 const void* addr2, mc_mem_region_t region2, std::size_t size);
194 XBT_PRIVATE int MC_snapshot_memcmp(
195 const void* addr1, simgrid::mc::Snapshot* snapshot1,
196 const void* addr2, simgrid::mc::Snapshot* snapshot2, int process_index, std::size_t size);
198 static XBT_ALWAYS_INLINE const void* mc_snapshot_get_heap_end(simgrid::mc::Snapshot* snapshot)
200 if(snapshot==nullptr)
201 xbt_die("snapshot is nullptr");
202 return mc_model_checker->process().get_heap()->breakval;
205 /** @brief Read memory from a snapshot region
207 * @param addr Process (non-snapshot) address of the data
208 * @param region Snapshot memory region where the data is located
209 * @param target Buffer to store the value
210 * @param size Size of the data to read in bytes
211 * @return Pointer where the data is located (target buffer of original location)
213 static XBT_ALWAYS_INLINE const void* MC_region_read(mc_mem_region_t region, void* target, const void* addr,
218 std::uintptr_t offset = (std::uintptr_t)addr - (std::uintptr_t)region->start().address();
220 xbt_assert(region->contain(simgrid::mc::remote(addr)), "Trying to read out of the region boundary.");
222 switch (region->storage_type()) {
223 case simgrid::mc::StorageType::NoData:
225 xbt_die("Storage type not supported");
227 case simgrid::mc::StorageType::Flat:
228 return (char*) region->flat_data().get() + offset;
230 case simgrid::mc::StorageType::Chunked:
232 // Last byte of the region:
233 void* end = (char*) addr + size - 1;
234 if (simgrid::mc::mmu::sameChunk((std::uintptr_t) addr, (std::uintptr_t) end) ) {
235 // The memory is contained in a single page:
236 return mc_translate_address_region_chunked((uintptr_t) addr, region);
238 // The memory spans several pages:
239 return MC_region_read_fragmented(region, target, addr, size);
243 // We currently do not pass the process_index to this function so we assume
244 // that the privatized region has been resolved in the callers:
245 case simgrid::mc::StorageType::Privatized:
246 xbt_die("Storage type not supported");
250 static XBT_ALWAYS_INLINE void* MC_region_read_pointer(mc_mem_region_t region, const void* addr)
253 return *(void**) MC_region_read(region, &res, addr, sizeof(void*));