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
13 #include <simgrid_config.h>
14 #include "../xbt/mmalloc/mmprivate.h"
15 #include <xbt/asserts.h>
16 #include <xbt/dynar.h>
18 #include "mc_forward.h"
19 #include "ModelChecker.hpp"
20 #include "PageStore.hpp"
21 #include "mc_mmalloc.h"
22 #include "mc/AddressSpace.hpp"
24 #include "RegionSnapshot.hpp"
28 // ***** Snapshot region
30 XBT_INTERNAL void mc_region_restore_sparse(mc_process_t process, mc_mem_region_t reg);
32 static inline __attribute__((always_inline))
33 void* mc_translate_address_region_chunked(uintptr_t addr, mc_mem_region_t region)
35 size_t pageno = mc_page_number((void*)region->start().address(), (void*) addr);
36 const void* snapshot_page =
37 region->page_data().page(pageno);
38 return (char*) snapshot_page + mc_page_offset((void*) addr);
41 static inline __attribute__((always_inline))
42 void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region, int process_index)
44 switch (region->storage_type()) {
45 case simgrid::mc::StorageType::NoData:
47 xbt_die("Storage type not supported");
49 case simgrid::mc::StorageType::Flat:
51 uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start().address();
52 return (void *) ((uintptr_t) region->flat_data().data() + offset);
55 case simgrid::mc::StorageType::Chunked:
56 return mc_translate_address_region_chunked(addr, region);
58 case simgrid::mc::StorageType::Privatized:
60 xbt_assert(process_index >=0,
61 "Missing process index for privatized region");
62 xbt_assert((size_t) process_index < region->privatized_data().size(),
63 "Out of range process index");
64 simgrid::mc::RegionSnapshot& subregion= region->privatized_data()[process_index];
65 return mc_translate_address_region(addr, &subregion, process_index);
70 XBT_INTERNAL mc_mem_region_t mc_get_snapshot_region(
71 const void* addr, const s_mc_snapshot_t *snapshot, int process_index);
77 * Some parts of the snapshot are ignored by zeroing them out: the real
78 * values is stored here.
80 typedef struct s_mc_snapshot_ignored_data {
84 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
86 typedef struct s_fd_infos{
89 off_t current_position;
91 }s_fd_infos_t, *fd_infos_t;
98 class Snapshot : public AddressSpace {
102 const void* read_bytes(void* buffer, std::size_t size,
103 remote_ptr<void> address, int process_index = ProcessIndexAny,
104 ReadMode mode = Normal) const MC_OVERRIDE;
105 public: // To be private
106 mc_process_t process;
108 size_t heap_bytes_used;
109 mc_mem_region_t* snapshot_regions;
110 size_t snapshot_regions_count;
111 xbt_dynar_t enabled_processes;
112 int privatization_index;
115 xbt_dynar_t to_ignore;
117 xbt_dynar_t ignored_data;
119 fd_infos_t *current_fd;
127 static inline __attribute__ ((always_inline))
128 mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
130 if (region->contain(simgrid::mc::remote(addr)))
133 return mc_get_snapshot_region(addr, snapshot, process_index);
136 /** Information about a given stack frame
139 typedef struct s_mc_stack_frame {
140 /** Instruction pointer */
144 unw_word_t frame_base;
147 unw_cursor_t unw_cursor;
148 } s_mc_stack_frame_t, *mc_stack_frame_t;
150 typedef struct s_mc_snapshot_stack{
151 xbt_dynar_t local_variables;
152 mc_unw_context_t context;
153 xbt_dynar_t stack_frames; // mc_stack_frame_t
155 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
157 typedef struct s_mc_global_t {
158 mc_snapshot_t snapshot;
161 int initial_communications_pattern_done;
162 int recv_deterministic;
163 int send_deterministic;
166 }s_mc_global_t, *mc_global_t;
168 static const void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot);
170 XBT_INTERNAL mc_snapshot_t MC_take_snapshot(int num_state);
171 XBT_INTERNAL void MC_restore_snapshot(mc_snapshot_t);
173 XBT_INTERNAL void mc_restore_page_snapshot_region(
174 mc_process_t process,
175 void* start_addr, simgrid::mc::PerPageCopy const& pagenos);
177 MC_SHOULD_BE_INTERNAL const void* MC_region_read_fragmented(
178 mc_mem_region_t region, void* target, const void* addr, size_t size);
180 MC_SHOULD_BE_INTERNAL int MC_snapshot_region_memcmp(
181 const void* addr1, mc_mem_region_t region1,
182 const void* addr2, mc_mem_region_t region2, size_t size);
183 XBT_INTERNAL int MC_snapshot_memcmp(
184 const void* addr1, mc_snapshot_t snapshot1,
185 const void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size);
187 static inline __attribute__ ((always_inline))
188 const void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot)
191 xbt_die("snapshot is NULL");
192 return mc_model_checker->process().get_heap()->breakval;
195 /** @brief Read memory from a snapshot region
197 * @param addr Process (non-snapshot) address of the data
198 * @param region Snapshot memory region where the data is located
199 * @param target Buffer to store the value
200 * @param size Size of the data to read in bytes
201 * @return Pointer where the data is located (target buffer of original location)
203 static inline __attribute__((always_inline))
204 const void* MC_region_read(mc_mem_region_t region, void* target, const void* addr, size_t size)
208 uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start().address();
210 xbt_assert(region->contain(simgrid::mc::remote(addr)),
211 "Trying to read out of the region boundary.");
213 switch (region->storage_type()) {
214 case simgrid::mc::StorageType::NoData:
216 xbt_die("Storage type not supported");
218 case simgrid::mc::StorageType::Flat:
219 return (char*) region->flat_data().data() + offset;
221 case simgrid::mc::StorageType::Chunked:
223 // Last byte of the region:
224 void* end = (char*) addr + size - 1;
225 if (mc_same_page(addr, end) ) {
226 // The memory is contained in a single page:
227 return mc_translate_address_region_chunked((uintptr_t) addr, region);
229 // The memory spans several pages:
230 return MC_region_read_fragmented(region, target, addr, size);
234 // We currently do not pass the process_index to this function so we assume
235 // that the privatized region has been resolved in the callers:
236 case simgrid::mc::StorageType::Privatized:
237 xbt_die("Storage type not supported");
241 static inline __attribute__ ((always_inline))
242 void* MC_region_read_pointer(mc_mem_region_t region, const void* addr)
245 return *(void**) MC_region_read(region, &res, addr, sizeof(void*));