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
16 #include <simgrid_config.h>
17 #include "../xbt/mmalloc/mmprivate.h"
18 #include <xbt/asserts.h>
19 #include <xbt/dynar.h>
21 #include "mc_forward.h"
22 #include "ModelChecker.hpp"
23 #include "PageStore.hpp"
24 #include "mc_mmalloc.h"
25 #include "mc/AddressSpace.hpp"
27 #include "RegionSnapshot.hpp"
31 // ***** Snapshot region
33 XBT_INTERNAL void mc_region_restore_sparse(mc_process_t process, mc_mem_region_t reg);
35 static inline __attribute__((always_inline))
36 void* mc_translate_address_region_chunked(uintptr_t addr, mc_mem_region_t region)
38 size_t pageno = mc_page_number((void*)region->start().address(), (void*) addr);
39 const void* snapshot_page =
40 region->page_data().page(pageno);
41 return (char*) snapshot_page + mc_page_offset((void*) addr);
44 static inline __attribute__((always_inline))
45 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().data() + 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_INTERNAL mc_mem_region_t mc_get_snapshot_region(
74 const void* addr, const s_mc_snapshot_t *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 {
89 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
91 typedef struct s_fd_infos{
94 off_t current_position;
96 }s_fd_infos_t, *fd_infos_t;
98 /** Information about a given stack frame
101 typedef struct s_mc_stack_frame {
102 /** Instruction pointer */
106 unw_word_t frame_base;
109 unw_cursor_t unw_cursor;
110 } s_mc_stack_frame_t, *mc_stack_frame_t;
112 typedef struct s_mc_snapshot_stack{
113 xbt_dynar_t local_variables;
114 mc_unw_context_t context;
115 xbt_dynar_t stack_frames; // mc_stack_frame_t
117 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
119 typedef struct s_mc_global_t {
120 mc_snapshot_t snapshot;
123 int initial_communications_pattern_done;
124 int recv_deterministic;
125 int send_deterministic;
128 }s_mc_global_t, *mc_global_t;
133 class Snapshot : public AddressSpace {
137 const void* read_bytes(void* buffer, std::size_t size,
138 remote_ptr<void> address, int process_index = ProcessIndexAny,
139 ReadMode mode = Normal) const MC_OVERRIDE;
140 public: // To be private
141 mc_process_t process;
143 size_t heap_bytes_used;
144 mc_mem_region_t* snapshot_regions;
145 size_t snapshot_regions_count;
146 std::set<pid_t> enabled_processes;
147 int privatization_index;
148 std::vector<size_t> stack_sizes;
150 xbt_dynar_t to_ignore;
152 xbt_dynar_t ignored_data;
153 std::vector<s_fd_infos_t> current_fds;
161 static inline __attribute__ ((always_inline))
162 mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
164 if (region->contain(simgrid::mc::remote(addr)))
167 return mc_get_snapshot_region(addr, snapshot, process_index);
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*));