1 /* Copyright (c) 2007-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include <sys/types.h> // off_t
11 #include <stdint.h> // size_t
15 #include <simgrid_config.h>
16 #include "../xbt/mmalloc/mmprivate.h"
17 #include <xbt/asserts.h>
18 #include <xbt/dynar.h>
20 #include "mc_forward.h"
21 #include "ModelChecker.hpp"
22 #include "PageStore.hpp"
23 #include "mc_mmalloc.h"
24 #include "mc/AddressSpace.hpp"
26 #include "RegionSnapshot.hpp"
30 // ***** Snapshot region
32 XBT_INTERNAL void mc_region_restore_sparse(mc_process_t process, mc_mem_region_t reg);
34 static inline __attribute__((always_inline))
35 void* mc_translate_address_region_chunked(uintptr_t addr, mc_mem_region_t region)
37 size_t pageno = mc_page_number((void*)region->start().address(), (void*) addr);
38 const void* snapshot_page =
39 region->page_data().page(pageno);
40 return (char*) snapshot_page + mc_page_offset((void*) addr);
43 static inline __attribute__((always_inline))
44 void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region, int process_index)
46 switch (region->storage_type()) {
47 case simgrid::mc::StorageType::NoData:
49 xbt_die("Storage type not supported");
51 case simgrid::mc::StorageType::Flat:
53 uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start().address();
54 return (void *) ((uintptr_t) region->flat_data().data() + offset);
57 case simgrid::mc::StorageType::Chunked:
58 return mc_translate_address_region_chunked(addr, region);
60 case simgrid::mc::StorageType::Privatized:
62 xbt_assert(process_index >=0,
63 "Missing process index for privatized region");
64 xbt_assert((size_t) process_index < region->privatized_data().size(),
65 "Out of range process index");
66 simgrid::mc::RegionSnapshot& subregion= region->privatized_data()[process_index];
67 return mc_translate_address_region(addr, &subregion, process_index);
72 XBT_INTERNAL mc_mem_region_t mc_get_snapshot_region(
73 const void* addr, const s_mc_snapshot_t *snapshot, int process_index);
79 * Some parts of the snapshot are ignored by zeroing them out: the real
80 * values is stored here.
82 typedef struct s_mc_snapshot_ignored_data {
86 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
88 typedef struct s_fd_infos{
91 off_t current_position;
93 }s_fd_infos_t, *fd_infos_t;
100 class Snapshot : public AddressSpace {
104 const void* read_bytes(void* buffer, std::size_t size,
105 remote_ptr<void> address, int process_index = ProcessIndexAny,
106 ReadMode mode = Normal) const MC_OVERRIDE;
107 public: // To be private
108 mc_process_t process;
110 size_t heap_bytes_used;
111 mc_mem_region_t* snapshot_regions;
112 size_t snapshot_regions_count;
113 std::set<pid_t> enabled_processes;
114 int privatization_index;
117 xbt_dynar_t to_ignore;
119 xbt_dynar_t ignored_data;
121 fd_infos_t *current_fd;
129 static inline __attribute__ ((always_inline))
130 mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
132 if (region->contain(simgrid::mc::remote(addr)))
135 return mc_get_snapshot_region(addr, snapshot, process_index);
138 /** Information about a given stack frame
141 typedef struct s_mc_stack_frame {
142 /** Instruction pointer */
146 unw_word_t frame_base;
149 unw_cursor_t unw_cursor;
150 } s_mc_stack_frame_t, *mc_stack_frame_t;
152 typedef struct s_mc_snapshot_stack{
153 xbt_dynar_t local_variables;
154 mc_unw_context_t context;
155 xbt_dynar_t stack_frames; // mc_stack_frame_t
157 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
159 typedef struct s_mc_global_t {
160 mc_snapshot_t snapshot;
163 int initial_communications_pattern_done;
164 int recv_deterministic;
165 int send_deterministic;
168 }s_mc_global_t, *mc_global_t;
170 static const void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot);
172 XBT_INTERNAL mc_snapshot_t MC_take_snapshot(int num_state);
173 XBT_INTERNAL void MC_restore_snapshot(mc_snapshot_t);
175 XBT_INTERNAL void mc_restore_page_snapshot_region(
176 mc_process_t process,
177 void* start_addr, simgrid::mc::PerPageCopy const& pagenos);
179 MC_SHOULD_BE_INTERNAL const void* MC_region_read_fragmented(
180 mc_mem_region_t region, void* target, const void* addr, size_t size);
182 MC_SHOULD_BE_INTERNAL int MC_snapshot_region_memcmp(
183 const void* addr1, mc_mem_region_t region1,
184 const void* addr2, mc_mem_region_t region2, size_t size);
185 XBT_INTERNAL int MC_snapshot_memcmp(
186 const void* addr1, mc_snapshot_t snapshot1,
187 const void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size);
189 static inline __attribute__ ((always_inline))
190 const void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot)
193 xbt_die("snapshot is NULL");
194 return mc_model_checker->process().get_heap()->breakval;
197 /** @brief Read memory from a snapshot region
199 * @param addr Process (non-snapshot) address of the data
200 * @param region Snapshot memory region where the data is located
201 * @param target Buffer to store the value
202 * @param size Size of the data to read in bytes
203 * @return Pointer where the data is located (target buffer of original location)
205 static inline __attribute__((always_inline))
206 const void* MC_region_read(mc_mem_region_t region, void* target, const void* addr, size_t size)
210 uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start().address();
212 xbt_assert(region->contain(simgrid::mc::remote(addr)),
213 "Trying to read out of the region boundary.");
215 switch (region->storage_type()) {
216 case simgrid::mc::StorageType::NoData:
218 xbt_die("Storage type not supported");
220 case simgrid::mc::StorageType::Flat:
221 return (char*) region->flat_data().data() + offset;
223 case simgrid::mc::StorageType::Chunked:
225 // Last byte of the region:
226 void* end = (char*) addr + size - 1;
227 if (mc_same_page(addr, end) ) {
228 // The memory is contained in a single page:
229 return mc_translate_address_region_chunked((uintptr_t) addr, region);
231 // The memory spans several pages:
232 return MC_region_read_fragmented(region, target, addr, size);
236 // We currently do not pass the process_index to this function so we assume
237 // that the privatized region has been resolved in the callers:
238 case simgrid::mc::StorageType::Privatized:
239 xbt_die("Storage type not supported");
243 static inline __attribute__ ((always_inline))
244 void* MC_region_read_pointer(mc_mem_region_t region, const void* addr)
247 return *(void**) MC_region_read(region, &res, addr, sizeof(void*));