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));
36 xbt_dynar_free(&(s->stack_frames));
41 static void MC_snapshot_stack_free_voidp(void *s){
42 MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
45 static void local_variable_free(local_variable_t v){
52 static void local_variable_free_voidp(void *v){
53 local_variable_free((local_variable_t) * (void **) v);
56 static void MC_region_destroy(mc_mem_region_t reg)
62 void MC_free_snapshot(mc_snapshot_t snapshot){
64 for(i=0; i < NB_REGIONS; i++)
65 MC_region_destroy(snapshot->regions[i]);
67 xbt_free(snapshot->stack_sizes);
68 xbt_dynar_free(&(snapshot->stacks));
69 xbt_dynar_free(&(snapshot->to_ignore));
74 /******************************* Snapshot regions ********************************/
75 /*********************************************************************************/
77 static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
79 mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
80 new_reg->start_addr = start_addr;
82 new_reg->data = xbt_malloc(size);
83 memcpy(new_reg->data, start_addr, size);
85 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
90 static void MC_region_restore(mc_mem_region_t reg)
92 /*FIXME: check if start_addr is still mapped, if it is not, then map it
93 before copying the data */
95 memcpy(reg->start_addr, reg->data, reg->size);
99 static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
101 mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
102 snapshot->regions[type] = new_reg;
106 static void MC_get_memory_regions(mc_snapshot_t snapshot){
113 char *lfields[6] = {0}, *tok;
114 void *start_addr, *start_addr1, *end_addr;
118 fp = fopen("/proc/self/maps", "r");
121 "Cannot open /proc/self/maps to investigate the memory map of the process. Please report this bug.");
125 while((read = xbt_getline(&line, &n, fp)) != -1){
127 /* Wipeout the new line character */
128 line[read - 1] = '\0';
130 /* Tokenize the line using spaces as delimiters and store each token */
131 lfields[0] = strtok(line, " ");
133 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
134 lfields[i] = strtok(NULL, " ");
137 /* First get the permissions flags, need write permission */
138 if(lfields[1][1] == 'w'){
140 /* Get the start address of the map */
141 tok = strtok(lfields[0], "-");
142 start_addr = (void *)strtoul(tok, NULL, 16);
144 if(start_addr == std_heap){ /* Std_heap ? */
145 tok = strtok(NULL, "-");
146 end_addr = (void *)strtoul(tok, NULL, 16);
147 MC_snapshot_add_region(snapshot, 0, start_addr, (char*)end_addr - (char*)start_addr);
148 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
149 }else{ /* map name == libsimgrid || binary_name ? */
150 if(lfields[5] != NULL){
151 if(!memcmp(basename(lfields[5]), "libsimgrid", 10)){
152 tok = strtok(NULL, "-");
153 end_addr = (void *)strtoul(tok, NULL, 16);
154 size = (char*)end_addr - (char*)start_addr;
155 /* BSS and data segments may be separated according to the OS */
156 if((read = xbt_getline(&line, &n, fp)) != -1){
157 line[read - 1] = '\0';
158 lfields[0] = strtok(line, " ");
159 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
160 lfields[i] = strtok(NULL, " ");
162 if(lfields[1][1] == 'w' && lfields[5] == NULL){
163 tok = strtok(lfields[0], "-");
164 start_addr1 = (void *)strtoul(tok, NULL, 16);
165 tok = strtok(NULL, "-");
166 size += (char *)(void *)strtoul(tok, NULL, 16) - (char*)start_addr1;
169 MC_snapshot_add_region(snapshot, 1, start_addr, size);
170 }else if(!memcmp(basename(lfields[5]), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
171 tok = strtok(NULL, "-");
172 end_addr = (void *)strtoul(tok, NULL, 16);
173 size = (char*)end_addr - (char*)start_addr;
174 /* BSS and data segments may be separated according to the OS */
175 if((read = xbt_getline(&line, &n, fp)) != -1){
176 line[read - 1] = '\0';
177 lfields[0] = strtok(line, " ");
178 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
179 lfields[i] = strtok(NULL, " ");
181 tok = strtok(lfields[0], "-");
182 start_addr1 = (void *)strtoul(tok, NULL, 16);
183 if(lfields[1][1] == 'w'){
184 if(start_addr1 == std_heap){ /* Std_heap ? */
185 tok = strtok(NULL, "-");
186 end_addr = (void *)strtoul(tok, NULL, 16);
187 MC_snapshot_add_region(snapshot, 0, start_addr1, (char*)end_addr - (char*)start_addr1);
188 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
189 }else if(start_addr1 != raw_heap){
190 tok = strtok(NULL, "-");
191 size += (char *)(void *)strtoul(tok, NULL, 16) - (char *)start_addr1;
195 MC_snapshot_add_region(snapshot, 2, start_addr, size);
196 }else if (!memcmp(lfields[5], "[stack]", 7)){
197 maestro_stack_start = start_addr;
198 tok = strtok(NULL, "-");
199 maestro_stack_end = (void *)strtoul(tok, NULL, 16);
212 /** @brief Finds the range of the different memory segments and binary paths */
213 void MC_init_memory_map_info(){
217 memory_map_t maps = MC_get_memory_map();
219 maestro_stack_start = NULL;
220 maestro_stack_end = NULL;
221 libsimgrid_path = NULL;
223 while (i < maps->mapsize) {
224 reg = maps->regions[i];
225 if (maps->regions[i].pathname == NULL) {
228 else if ((reg.prot & PROT_WRITE) && !memcmp(maps->regions[i].pathname, "[stack]", 7)){
229 maestro_stack_start = reg.start_addr;
230 maestro_stack_end = reg.end_addr;
231 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
232 if(libsimgrid_path == NULL)
233 libsimgrid_path = strdup(maps->regions[i].pathname);
238 xbt_assert(maestro_stack_start, "maestro_stack_start");
239 xbt_assert(maestro_stack_end, "maestro_stack_end");
240 xbt_assert(libsimgrid_path, "libsimgrid_path&");
242 MC_free_memory_map(maps);
246 /** \brief Fill/llokup the "subtype" field.
248 static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) {
250 if(type->dw_type_id==NULL)
252 type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
253 if(type->subtype==NULL)
255 if(type->subtype->byte_size != 0)
257 if(type->subtype->name==NULL)
259 // Try to find a more complete description of the type:
260 // We need to fix in order to support C++.
262 dw_type_t subtype = xbt_dict_get_or_null(info->types_by_name, type->subtype->name);
264 type->subtype = subtype;
267 // TODO, support "switch type" (looking up the type in another lib) when possible
270 static void MC_post_process_types(mc_object_info_t info) {
271 xbt_dict_cursor_t cursor = NULL;
275 // Lookup "subtype" field:
276 xbt_dict_foreach(info->types, cursor, origin, type){
277 MC_resolve_subtype(info, type);
281 if(type->members!=NULL) xbt_dynar_foreach(type->members, i, member) {
282 MC_resolve_subtype(info, member);
287 /** \brief Finds informations about a given shared object/executable */
288 mc_object_info_t MC_find_object_info(memory_map_t maps, char* name) {
289 mc_object_info_t result = MC_new_object_info();
290 result->file_name = xbt_strdup(name);
291 MC_find_object_address(maps, result);
292 MC_dwarf_get_variables(result);
293 MC_post_process_types(result);
297 /** \brief Fills the position of the .bss and .data sections. */
298 static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) {
302 const char* name = basename(result->file_name);
303 while (i < maps->mapsize) {
304 reg = maps->regions[i];
305 if (maps->regions[i].pathname == NULL || strcmp(basename(maps->regions[i].pathname), name)) {
308 else if ((reg.prot & PROT_WRITE)){
309 xbt_assert(!result->start_rw,
310 "Multiple read-write segments for %s, not supported",
311 maps->regions[i].pathname);
312 result->start_rw = reg.start_addr;
313 result->end_rw = reg.end_addr;
314 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
315 xbt_assert(!result->start_exec,
316 "Multiple executable segments for %s, not supported",
317 maps->regions[i].pathname);
318 result->start_exec = reg.start_addr;
319 result->end_exec = reg.end_addr;
321 else if((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
322 xbt_assert(!result->start_ro,
323 "Multiple read only segments for %s, not supported",
324 maps->regions[i].pathname);
325 result->start_ro = reg.start_addr;
326 result->end_ro = reg.end_addr;
331 xbt_assert(result->file_name);
332 xbt_assert(result->start_rw);
333 xbt_assert(result->start_exec);
336 /************************************* Take Snapshot ************************************/
337 /****************************************************************************************/
339 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){
341 unsigned cursor1 = 0;
342 mc_stack_frame_t stack_frame;
343 xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
345 xbt_dynar_foreach(stack_frames,cursor1,stack_frame) {
347 unsigned cursor2 = 0;
348 dw_variable_t current_variable;
349 xbt_dynar_foreach(stack_frame->frame->variables, cursor2, current_variable){
352 if((long)stack_frame->ip > (long)mc_libsimgrid_info->start_exec)
357 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
358 new_var->frame = xbt_strdup(stack_frame->frame_name);
359 new_var->ip = stack_frame->ip;
360 new_var->name = xbt_strdup(current_variable->name);
361 new_var->type = strdup(current_variable->type_origin);
362 new_var->region= region_type;
364 /* if(current_variable->address!=NULL) {
365 new_var->address = current_variable->address;
367 if(current_variable->location != NULL){
368 new_var->address = (void*) MC_dwarf_resolve_location(
369 &(stack_frame->unw_cursor), current_variable->location, (void*)stack_frame->frame_base);
372 xbt_dynar_push(variables, &new_var);
381 static void MC_stack_frame_free_voipd(void *s){
382 mc_stack_frame_t stack_frame = *(mc_stack_frame_t*)s;
384 xbt_free(stack_frame->frame_name);
385 xbt_free(stack_frame);
389 static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) {
390 xbt_dynar_t result = xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
394 char frame_name[256];
397 for(ret = unw_init_local(&c, (unw_context_t *)stack_context); ret >= 0; ret = unw_step(&c)){
398 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
399 xbt_dynar_push(result, &stack_frame);
401 stack_frame->unw_cursor = c;
403 unw_get_reg(&c, UNW_REG_IP, &stack_frame->ip);
404 unw_get_reg(&c, UNW_REG_SP, &stack_frame->sp);
407 unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off);
408 stack_frame->frame_name = xbt_strdup(frame_name);
411 if((long)stack_frame->ip > (long) mc_libsimgrid_info->start_exec)
412 frame = xbt_dict_get_or_null(mc_libsimgrid_info->local_variables, frame_name);
414 frame = xbt_dict_get_or_null(mc_binary_info->local_variables, frame_name);
415 stack_frame->frame = frame;
418 unw_word_t normalized_ip = (unw_word_t)frame->low_pc + (unw_word_t)off;
419 stack_frame->frame_base = (unw_word_t)mc_find_frame_base(normalized_ip, frame, &c);
421 stack_frame->frame_base = 0;
424 /* Stop before context switch with maestro */
425 if(!strcmp(frame_name, "smx_ctx_sysv_wrapper"))
429 if(xbt_dynar_length(result) == 0){
430 XBT_INFO("unw_init_local failed");
437 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){
439 xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), MC_snapshot_stack_free_voidp);
441 unsigned int cursor = 0;
442 stack_region_t current_stack;
444 xbt_dynar_foreach(stacks_areas, cursor, current_stack){
445 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
446 st->stack_frames = MC_unwind_stack_frames(current_stack->context);
447 st->local_variables = MC_get_local_variables_values(st->stack_frames);
449 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
450 st->stack_pointer = ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
452 st->real_address = current_stack->address;
453 xbt_dynar_push(res, &st);
454 (*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
455 (*snapshot)->stack_sizes[cursor] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap)));
462 static xbt_dynar_t MC_take_snapshot_ignore(){
464 if(mc_heap_comparison_ignore == NULL)
467 xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp);
469 unsigned int cursor = 0;
470 mc_heap_ignore_region_t current_region;
472 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region){
473 mc_heap_ignore_region_t new_region = NULL;
474 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
475 new_region->address = current_region->address;
476 new_region->size = current_region->size;
477 new_region->block = current_region->block;
478 new_region->fragment = current_region->fragment;
479 xbt_dynar_push(cpy, &new_region);
486 static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){
488 unsigned int cursor = 0;
489 mc_checkpoint_ignore_region_t region;
492 xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){
493 if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){
494 offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr;
495 memset((char *)snapshot->regions[0]->data + offset, 0, region->size);
496 }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){
497 offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr;
498 memset((char *)snapshot->regions[2]->data + offset, 0, region->size);
499 }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){
500 offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr;
501 memset((char *)snapshot->regions[1]->data + offset, 0, region->size);
508 mc_snapshot_t MC_take_snapshot(int num_state){
510 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
511 snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
513 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
514 MC_get_memory_regions(snapshot);
516 snapshot->to_ignore = MC_take_snapshot_ignore();
518 if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){
519 snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data);
520 if(_sg_mc_hash && snapshot->stacks!=NULL) {
521 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
531 MC_dump_checkpoint_ignore(snapshot);
537 void MC_restore_snapshot(mc_snapshot_t snapshot){
539 for(i=0; i < NB_REGIONS; i++){
540 MC_region_restore(snapshot->regions[i]);
545 mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
546 return MC_take_snapshot(1);
549 void *MC_snapshot(void){
550 return simcall_mc_snapshot();