1 /* Copyright (c) 2008-2013. 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. */
12 #include "mc_private.h"
13 #include "xbt/module.h"
14 #include <xbt/mmalloc.h>
16 #include "../simix/smx_private.h"
18 #include <libunwind.h>
21 #include "mc_private.h"
23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
24 "Logging specific to mc_checkpoint");
26 char *libsimgrid_path;
28 static void MC_find_object_address(memory_map_t maps, mc_object_info_t result);
30 /************************************ Free functions **************************************/
31 /*****************************************************************************************/
33 static void MC_snapshot_stack_free(mc_snapshot_stack_t s){
35 xbt_dynar_free(&(s->local_variables));
40 static void MC_snapshot_stack_free_voidp(void *s){
41 MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
44 static void local_variable_free(local_variable_t v){
51 static void local_variable_free_voidp(void *v){
52 local_variable_free((local_variable_t) * (void **) v);
55 static void MC_region_destroy(mc_mem_region_t reg)
61 void MC_free_snapshot(mc_snapshot_t snapshot){
63 for(i=0; i < NB_REGIONS; i++)
64 MC_region_destroy(snapshot->regions[i]);
66 xbt_free(snapshot->stack_sizes);
67 xbt_dynar_free(&(snapshot->stacks));
68 xbt_dynar_free(&(snapshot->to_ignore));
73 /******************************* Snapshot regions ********************************/
74 /*********************************************************************************/
76 static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
78 mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
79 new_reg->start_addr = start_addr;
81 new_reg->data = xbt_malloc(size);
82 memcpy(new_reg->data, start_addr, size);
84 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
89 static void MC_region_restore(mc_mem_region_t reg)
91 /*FIXME: check if start_addr is still mapped, if it is not, then map it
92 before copying the data */
94 memcpy(reg->start_addr, reg->data, reg->size);
98 static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
100 mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
101 snapshot->regions[type] = new_reg;
105 static void MC_get_memory_regions(mc_snapshot_t snapshot){
112 char *lfields[6] = {0}, *tok;
113 void *start_addr, *start_addr1, *end_addr;
117 fp = fopen("/proc/self/maps", "r");
120 "Cannot open /proc/self/maps to investigate the memory map of the process. Please report this bug.");
124 while((read = xbt_getline(&line, &n, fp)) != -1){
126 /* Wipeout the new line character */
127 line[read - 1] = '\0';
129 /* Tokenize the line using spaces as delimiters and store each token */
130 lfields[0] = strtok(line, " ");
132 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
133 lfields[i] = strtok(NULL, " ");
136 /* First get the permissions flags, need write permission */
137 if(lfields[1][1] == 'w'){
139 /* Get the start address of the map */
140 tok = strtok(lfields[0], "-");
141 start_addr = (void *)strtoul(tok, NULL, 16);
143 if(start_addr == std_heap){ /* Std_heap ? */
144 tok = strtok(NULL, "-");
145 end_addr = (void *)strtoul(tok, NULL, 16);
146 MC_snapshot_add_region(snapshot, 0, start_addr, (char*)end_addr - (char*)start_addr);
147 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
148 }else{ /* map name == libsimgrid || binary_name ? */
149 if(lfields[5] != NULL){
150 if(!memcmp(basename(lfields[5]), "libsimgrid", 10)){
151 tok = strtok(NULL, "-");
152 end_addr = (void *)strtoul(tok, NULL, 16);
153 size = (char*)end_addr - (char*)start_addr;
154 /* BSS and data segments may be separated according to the OS */
155 if((read = xbt_getline(&line, &n, fp)) != -1){
156 line[read - 1] = '\0';
157 lfields[0] = strtok(line, " ");
158 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
159 lfields[i] = strtok(NULL, " ");
161 if(lfields[1][1] == 'w' && lfields[5] == NULL){
162 tok = strtok(lfields[0], "-");
163 start_addr1 = (void *)strtoul(tok, NULL, 16);
164 tok = strtok(NULL, "-");
165 size += (char *)(void *)strtoul(tok, NULL, 16) - (char*)start_addr1;
168 MC_snapshot_add_region(snapshot, 1, start_addr, size);
169 }else if(!memcmp(basename(lfields[5]), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
170 tok = strtok(NULL, "-");
171 end_addr = (void *)strtoul(tok, NULL, 16);
172 size = (char*)end_addr - (char*)start_addr;
173 /* BSS and data segments may be separated according to the OS */
174 if((read = xbt_getline(&line, &n, fp)) != -1){
175 line[read - 1] = '\0';
176 lfields[0] = strtok(line, " ");
177 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
178 lfields[i] = strtok(NULL, " ");
180 tok = strtok(lfields[0], "-");
181 start_addr1 = (void *)strtoul(tok, NULL, 16);
182 if(lfields[1][1] == 'w'){
183 if(start_addr1 == std_heap){ /* Std_heap ? */
184 tok = strtok(NULL, "-");
185 end_addr = (void *)strtoul(tok, NULL, 16);
186 MC_snapshot_add_region(snapshot, 0, start_addr1, (char*)end_addr - (char*)start_addr1);
187 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
188 }else if(start_addr1 != raw_heap){
189 tok = strtok(NULL, "-");
190 size += (char *)(void *)strtoul(tok, NULL, 16) - (char *)start_addr1;
194 MC_snapshot_add_region(snapshot, 2, start_addr, size);
195 }else if (!memcmp(lfields[5], "[stack]", 7)){
196 maestro_stack_start = start_addr;
197 tok = strtok(NULL, "-");
198 maestro_stack_end = (void *)strtoul(tok, NULL, 16);
211 /** @brief Finds the range of the different memory segments and binary paths */
212 void MC_init_memory_map_info(){
216 memory_map_t maps = MC_get_memory_map();
218 maestro_stack_start = NULL;
219 maestro_stack_end = NULL;
220 libsimgrid_path = NULL;
222 while (i < maps->mapsize) {
223 reg = maps->regions[i];
224 if (maps->regions[i].pathname == NULL) {
227 else if ((reg.prot & PROT_WRITE) && !memcmp(maps->regions[i].pathname, "[stack]", 7)){
228 maestro_stack_start = reg.start_addr;
229 maestro_stack_end = reg.end_addr;
230 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
231 if(libsimgrid_path == NULL)
232 libsimgrid_path = strdup(maps->regions[i].pathname);
237 xbt_assert(maestro_stack_start, "maestro_stack_start");
238 xbt_assert(maestro_stack_end, "maestro_stack_end");
239 xbt_assert(libsimgrid_path, "libsimgrid_path&");
241 MC_free_memory_map(maps);
245 /** \brief Fill/llokup the "subtype" field.
247 static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) {
249 if(type->dw_type_id==NULL)
251 type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
252 if(type->subtype==NULL)
254 if(type->subtype->byte_size != 0)
256 if(type->subtype->name==NULL)
258 // Try to find a more complete description of the type:
259 // We need to fix in order to support C++.
261 dw_type_t subtype = xbt_dict_get_or_null(info->types_by_name, type->subtype->name);
263 type->subtype = subtype;
266 // TODO, support "switch type" (looking up the type in another lib) when possible
269 static void MC_post_process_types(mc_object_info_t info) {
270 xbt_dict_cursor_t cursor = NULL;
274 // Lookup "subtype" field:
275 xbt_dict_foreach(info->types, cursor, origin, type){
276 MC_resolve_subtype(info, type);
280 if(type->members!=NULL) xbt_dynar_foreach(type->members, i, member) {
281 MC_resolve_subtype(info, member);
286 /** \brief Finds informations about a given shared object/executable */
287 mc_object_info_t MC_find_object_info(memory_map_t maps, char* name) {
288 mc_object_info_t result = MC_new_object_info();
289 result->file_name = xbt_strdup(name);
290 MC_find_object_address(maps, result);
291 MC_dwarf_get_variables(result);
292 MC_post_process_types(result);
296 /** \brief Fills the position of the .bss and .data sections. */
297 static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) {
301 const char* name = basename(result->file_name);
302 while (i < maps->mapsize) {
303 reg = maps->regions[i];
304 if (maps->regions[i].pathname == NULL || strcmp(basename(maps->regions[i].pathname), name)) {
307 else if ((reg.prot & PROT_WRITE)){
308 xbt_assert(!result->start_rw,
309 "Multiple read-write segments for %s, not supported",
310 maps->regions[i].pathname);
311 result->start_rw = reg.start_addr;
312 result->end_rw = reg.end_addr;
313 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
314 xbt_assert(!result->start_exec,
315 "Multiple executable segments for %s, not supported",
316 maps->regions[i].pathname);
317 result->start_exec = reg.start_addr;
318 result->end_exec = reg.end_addr;
320 else if((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
321 xbt_assert(!result->start_ro,
322 "Multiple read only segments for %s, not supported",
323 maps->regions[i].pathname);
324 result->start_ro = reg.start_addr;
325 result->end_ro = reg.end_addr;
330 xbt_assert(result->file_name);
331 xbt_assert(result->start_rw);
332 xbt_assert(result->start_exec);
335 /************************************* Take Snapshot ************************************/
336 /****************************************************************************************/
338 static xbt_dynar_t MC_get_local_variables_values(void *stack_context){
343 char frame_name[256];
345 ret = unw_init_local(&c, (unw_context_t *)stack_context);
347 XBT_INFO("unw_init_local failed");
354 unsigned int cursor = 0;
355 dw_variable_t current_variable;
357 void *frame_pointer_address = NULL;
361 xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
363 while(ret >= 0 && !stop){
365 unw_get_reg(&c, UNW_REG_IP, &ip);
367 unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off);
369 if(!strcmp(frame_name, "smx_ctx_sysv_wrapper")) /* Stop before context switch with maestro */
372 if((long)ip > (long) mc_libsimgrid_info->start_exec)
373 frame = xbt_dict_get_or_null(mc_libsimgrid_info->local_variables, frame_name);
375 frame = xbt_dict_get_or_null(mc_binary_info->local_variables, frame_name);
382 true_ip = (long)frame->low_pc + (long)off;
383 frame_pointer_address = mc_find_frame_base(true_ip, frame, &c);
387 xbt_dynar_foreach(frame->variables, cursor, current_variable){
389 if((long)ip > (long)mc_libsimgrid_info->start_exec)
394 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
395 new_var->frame = xbt_strdup(frame_name);
396 new_var->ip = (unsigned long)ip;
397 new_var->name = xbt_strdup(current_variable->name);
398 new_var->type = strdup(current_variable->type_origin);
399 new_var->region= region_type;
401 /* if(current_variable->address!=NULL) {
402 new_var->address = current_variable->address;
404 if(current_variable->location != NULL){
405 new_var->address = (void*) MC_dwarf_resolve_location(&c, current_variable->location, frame_pointer_address);
408 xbt_dynar_push(variables, &new_var);
421 static void *MC_get_stack_pointer(void *stack_context, void *heap){
427 ret = unw_init_local(&c, (unw_context_t *)stack_context);
429 XBT_INFO("unw_init_local failed");
433 unw_get_reg(&c, UNW_REG_SP, &sp);
435 return ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
439 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){
441 xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), MC_snapshot_stack_free_voidp);
443 unsigned int cursor = 0;
444 stack_region_t current_stack;
446 xbt_dynar_foreach(stacks_areas, cursor, current_stack){
447 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
448 st->local_variables = MC_get_local_variables_values(current_stack->context);
449 st->stack_pointer = MC_get_stack_pointer(current_stack->context, heap);
450 st->real_address = current_stack->address;
451 xbt_dynar_push(res, &st);
452 (*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
453 (*snapshot)->stack_sizes[cursor] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap)));
460 static xbt_dynar_t MC_take_snapshot_ignore(){
462 if(mc_heap_comparison_ignore == NULL)
465 xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp);
467 unsigned int cursor = 0;
468 mc_heap_ignore_region_t current_region;
470 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region){
471 mc_heap_ignore_region_t new_region = NULL;
472 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
473 new_region->address = current_region->address;
474 new_region->size = current_region->size;
475 new_region->block = current_region->block;
476 new_region->fragment = current_region->fragment;
477 xbt_dynar_push(cpy, &new_region);
484 static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){
486 unsigned int cursor = 0;
487 mc_checkpoint_ignore_region_t region;
490 xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){
491 if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){
492 offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr;
493 memset((char *)snapshot->regions[0]->data + offset, 0, region->size);
494 }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){
495 offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr;
496 memset((char *)snapshot->regions[2]->data + offset, 0, region->size);
497 }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){
498 offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr;
499 memset((char *)snapshot->regions[1]->data + offset, 0, region->size);
506 mc_snapshot_t MC_take_snapshot(int num_state){
508 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
509 snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
510 if(MC_USE_SNAPSHOT_HASH) {
511 snapshot->hash = mc_hash_processes_state(num_state);
516 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
517 MC_get_memory_regions(snapshot);
519 snapshot->to_ignore = MC_take_snapshot_ignore();
521 if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){
522 snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data);
526 MC_dump_checkpoint_ignore(snapshot);
532 void MC_restore_snapshot(mc_snapshot_t snapshot){
534 for(i=0; i < NB_REGIONS; i++){
535 MC_region_restore(snapshot->regions[i]);
540 mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
541 return MC_take_snapshot(1);
544 void *MC_snapshot(void){
545 return simcall_mc_snapshot();