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 "mc_model_checker.h"
20 #include "mc_page_store.h"
21 #include "mc_mmalloc.h"
25 void mc_softdirty_reset(void);
27 // ***** Snapshot region
29 typedef enum e_mc_region_type_t {
30 MC_REGION_TYPE_UNKNOWN = 0,
31 MC_REGION_TYPE_HEAP = 1,
32 MC_REGION_TYPE_DATA = 2
35 // TODO, use OO instead of this
36 typedef enum e_mc_region_storeage_type_t {
37 MC_REGION_STORAGE_TYPE_NONE = 0,
38 MC_REGION_STORAGE_TYPE_FLAT = 1,
39 MC_REGION_STORAGE_TYPE_CHUNKED = 2,
40 MC_REGION_STORAGE_TYPE_PRIVATIZED = 3
41 } mc_region_storage_type_t;
43 /** @brief Copy/snapshot of a given memory region
45 * Different types of region snapshot storage types exist:
47 * <li>flat/dense snapshots are a simple copy of the region;</li>
48 * <li>sparse/per-page snapshots are snaapshots which shared
49 * identical pages.</li>
50 * <li>privatized (SMPI global variable privatisation).
53 * This is handled with a variant based approch:
55 * * `storage_type` identified the type of storage;
56 * * an anonymous enum is used to distinguish the relevant types for
59 typedef struct s_mc_mem_region s_mc_mem_region_t, *mc_mem_region_t;
61 struct s_mc_mem_region {
62 mc_region_type_t region_type;
63 mc_region_storage_type_t storage_type;
64 mc_object_info_t object_info;
66 /** @brief Virtual address of the region in the simulated process */
69 /** @brief Size of the data region in bytes */
72 /** @brief Permanent virtual address of the region
74 * This is usually the same address as the simuilated process address.
75 * However, when using SMPI privatization of global variables,
76 * each SMPI process has its own set of global variables stored
77 * at a different virtual address. The scheduler maps those region
78 * on the region of the global variables.
85 /** @brief Copy of the snapshot for flat snapshots regions (NULL otherwise) */
89 /** @brief Pages indices in the page store for per-page snapshots (NULL otherwise) */
94 mc_mem_region_t* regions;
100 mc_mem_region_t mc_region_new_sparse(mc_region_type_t type, void *start_addr, void* data_addr, size_t size, mc_mem_region_t ref_reg);
101 void MC_region_destroy(mc_mem_region_t reg);
102 void mc_region_restore_sparse(mc_mem_region_t reg, mc_mem_region_t ref_reg);
104 static inline __attribute__ ((always_inline))
105 bool mc_region_contain(mc_mem_region_t region, void* p)
107 return p >= region->start_addr &&
108 p < (void*)((char*) region->start_addr + region->size);
111 static inline __attribute__((always_inline))
112 void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region)
114 size_t pageno = mc_page_number(region->start_addr, (void*) addr);
115 size_t snapshot_pageno = region->chunked.page_numbers[pageno];
116 const void* snapshot_page = mc_page_store_get_page(mc_model_checker->pages, snapshot_pageno);
117 return (char*) snapshot_page + mc_page_offset((void*) addr);
120 mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot, int process_index);
122 /** \brief Translate a pointer from process address space to snapshot address space
124 * The address space contains snapshot of the main/application memory:
125 * this function finds the address in a given snaphot for a given
126 * real/application address.
128 * For read only memory regions and other regions which are not int the
129 * snapshot, the address is not changed.
131 * \param addr Application address
132 * \param snapshot The snapshot of interest (if NULL no translation is done)
133 * \return Translated address in the snapshot address space
135 static inline __attribute__((always_inline))
136 void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot, int process_index)
139 // If not in a process state/clone:
141 return (uintptr_t *) addr;
144 mc_mem_region_t region = mc_get_snapshot_region((void*) addr, snapshot, process_index);
146 xbt_assert(mc_region_contain(region, (void*) addr), "Trying to read out of the region boundary.");
149 return (void *) addr;
152 switch (region->storage_type) {
153 case MC_REGION_STORAGE_TYPE_NONE:
155 xbt_die("Storage type not supported");
157 case MC_REGION_STORAGE_TYPE_FLAT:
159 uintptr_t offset = addr - (uintptr_t) region->start_addr;
160 return (void *) ((uintptr_t) region->flat.data + offset);
163 case MC_REGION_STORAGE_TYPE_CHUNKED:
164 return mc_translate_address_region(addr, region);
166 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
168 xbt_assert(process_index >=0,
169 "Missing process index for privatized region");
170 xbt_assert((size_t) process_index < region->privatized.regions_count,
171 "Out of range process index");
172 mc_mem_region_t subregion = region->privatized.regions[process_index];
173 xbt_assert(subregion, "Missing memory region for process %i", process_index);
174 return mc_translate_address(addr, snapshot, process_index);
183 * Some parts of the snapshot are ignored by zeroing them out: the real
184 * values is stored here.
186 typedef struct s_mc_snapshot_ignored_data {
190 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
192 typedef struct s_fd_infos{
195 off_t current_position;
197 }s_fd_infos_t, *fd_infos_t;
199 struct s_mc_snapshot{
200 size_t heap_bytes_used;
201 mc_mem_region_t* snapshot_regions;
202 size_t snapshot_regions_count;
203 xbt_dynar_t enabled_processes;
204 int privatization_index;
207 xbt_dynar_t to_ignore;
209 xbt_dynar_t ignored_data;
211 fd_infos_t *current_fd;
214 /** @brief Process index used when no process is available
216 * The expected behaviour is that if a process index is needed it will fail.
218 #define MC_NO_PROCESS_INDEX -1
220 /** @brief Process index when any process is suitable
222 * We could use a special negative value in the future.
224 #define MC_ANY_PROCESS_INDEX 0
226 static inline __attribute__ ((always_inline))
227 mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
229 if (mc_region_contain(region, addr))
232 return mc_get_snapshot_region(addr, snapshot, process_index);
235 /** Information about a given stack frame
238 typedef struct s_mc_stack_frame {
239 /** Instruction pointer */
243 unw_word_t frame_base;
246 unw_cursor_t unw_cursor;
247 } s_mc_stack_frame_t, *mc_stack_frame_t;
249 typedef struct s_mc_snapshot_stack{
250 xbt_dynar_t local_variables;
251 xbt_dynar_t stack_frames; // mc_stack_frame_t
253 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
255 typedef struct s_mc_global_t{
256 mc_snapshot_t snapshot;
260 int initial_communications_pattern_done;
261 int comm_deterministic;
262 int send_deterministic;
263 }s_mc_global_t, *mc_global_t;
265 typedef struct s_mc_checkpoint_ignore_region{
268 }s_mc_checkpoint_ignore_region_t, *mc_checkpoint_ignore_region_t;
270 static void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot);
272 mc_snapshot_t MC_take_snapshot(int num_state);
273 void MC_restore_snapshot(mc_snapshot_t);
274 void MC_free_snapshot(mc_snapshot_t);
276 int mc_important_snapshot(mc_snapshot_t snapshot);
278 size_t* mc_take_page_snapshot_region(void* data, size_t page_count, uint64_t* pagemap, size_t* reference_pages);
279 void mc_free_page_snapshot_region(size_t* pagenos, size_t page_count);
280 void mc_restore_page_snapshot_region(void* start_addr, size_t page_count, size_t* pagenos, uint64_t* pagemap, size_t* reference_pagenos);
282 void* mc_snapshot_read_fragmented(void* addr, mc_mem_region_t region, void* target, size_t size);
284 void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, int process_index, void* target, size_t size);
285 int mc_snapshot_region_memcmp(
286 void* addr1, mc_mem_region_t region1,
287 void* addr2, mc_mem_region_t region2, size_t size);
288 int mc_snapshot_memcmp(
289 void* addr1, mc_snapshot_t snapshot1,
290 void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size);
292 static void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot, int process_index);
294 static inline __attribute__ ((always_inline))
295 void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot, int process_index)
298 return *(void**) mc_snapshot_read(addr, snapshot, process_index, &res, sizeof(void*));
301 static inline __attribute__ ((always_inline))
302 void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot) {
304 xbt_die("snapshot is NULL");
305 void** addr = &(std_heap->breakval);
306 return mc_snapshot_read_pointer(addr, snapshot, MC_ANY_PROCESS_INDEX);
309 /** @brief Read memory from a snapshot region
311 * @param addr Process (non-snapshot) address of the data
312 * @param region Snapshot memory region where the data is located
313 * @param target Buffer to store the value
314 * @param size Size of the data to read in bytes
315 * @return Pointer where the data is located (target buffer of original location)
317 static inline __attribute__((always_inline))
318 void* mc_snapshot_read_region(void* addr, mc_mem_region_t region, void* target, size_t size)
323 uintptr_t offset = (char*) addr - (char*) region->start_addr;
325 xbt_assert(mc_region_contain(region, addr),
326 "Trying to read out of the region boundary.");
328 switch (region->storage_type) {
329 case MC_REGION_STORAGE_TYPE_NONE:
331 xbt_die("Storage type not supported");
333 case MC_REGION_STORAGE_TYPE_FLAT:
334 return (char*) region->flat.data + offset;
336 case MC_REGION_STORAGE_TYPE_CHUNKED:
338 // Last byte of the region:
339 void* end = (char*) addr + size - 1;
340 if( mc_same_page(addr, end) ) {
341 // The memory is contained in a single page:
342 return mc_translate_address_region((uintptr_t) addr, region);
344 // The memory spans several pages:
345 return mc_snapshot_read_fragmented(addr, region, target, size);
349 // We currently do not pass the process_index to this function so we assume
350 // that the privatized region has been resolved in the callers:
351 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
352 xbt_die("Storage type not supported");
356 static inline __attribute__ ((always_inline))
357 void* mc_snapshot_read_pointer_region(void* addr, mc_mem_region_t region)
360 return *(void**) mc_snapshot_read_region(addr, region, &res, sizeof(void*));