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 "xbt/mmalloc/mmprivate.h"
18 #include "../simix/smx_private.h"
20 #include <libunwind.h>
23 #include "mc_private.h"
25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
26 "Logging specific to mc_checkpoint");
28 char *libsimgrid_path;
30 static void MC_find_object_address(memory_map_t maps, mc_object_info_t result);
32 /************************************ Free functions **************************************/
33 /*****************************************************************************************/
35 static void MC_snapshot_stack_free(mc_snapshot_stack_t s){
37 xbt_dynar_free(&(s->local_variables));
38 xbt_dynar_free(&(s->stack_frames));
43 static void MC_snapshot_stack_free_voidp(void *s){
44 MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
47 static void local_variable_free(local_variable_t v){
54 static void local_variable_free_voidp(void *v){
55 local_variable_free((local_variable_t) * (void **) v);
58 static void MC_region_destroy(mc_mem_region_t reg)
64 void MC_free_snapshot(mc_snapshot_t snapshot){
66 for(i=0; i < NB_REGIONS; i++)
67 MC_region_destroy(snapshot->regions[i]);
69 xbt_free(snapshot->stack_sizes);
70 xbt_dynar_free(&(snapshot->stacks));
71 xbt_dynar_free(&(snapshot->to_ignore));
76 /******************************* Snapshot regions ********************************/
77 /*********************************************************************************/
79 static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
81 mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
82 new_reg->start_addr = start_addr;
84 new_reg->data = xbt_malloc(size);
85 memcpy(new_reg->data, start_addr, size);
87 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
92 static void MC_region_restore(mc_mem_region_t reg)
94 /*FIXME: check if start_addr is still mapped, if it is not, then map it
95 before copying the data */
97 memcpy(reg->start_addr, reg->data, reg->size);
101 static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
103 mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
104 snapshot->regions[type] = new_reg;
108 static void MC_get_memory_regions(mc_snapshot_t snapshot){
110 void* start_heap = ((xbt_mheap_t)std_heap)->base;
111 void* end_heap = ((xbt_mheap_t)std_heap)->breakval;
112 MC_snapshot_add_region(snapshot, 0, start_heap, (char*) end_heap - (char*) start_heap);
113 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
121 char *lfields[6] = {0}, *tok;
122 void *start_addr, *start_addr1, *end_addr;
126 fp = fopen("/proc/self/maps", "r");
129 "Cannot open /proc/self/maps to investigate the memory map of the process. Please report this bug.");
133 while((read = xbt_getline(&line, &n, fp)) != -1){
135 /* Wipeout the new line character */
136 line[read - 1] = '\0';
138 /* Tokenize the line using spaces as delimiters and store each token */
139 lfields[0] = strtok(line, " ");
141 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
142 lfields[i] = strtok(NULL, " ");
145 /* First get the permissions flags, need write permission */
146 if(lfields[1][1] == 'w'){
148 /* Get the start address of the map */
149 tok = strtok(lfields[0], "-");
150 start_addr = (void *)strtoul(tok, NULL, 16);
152 if(start_addr == std_heap){ /* Std_heap ? */
154 }else{ /* map name == libsimgrid || binary_name ? */
155 if(lfields[5] != NULL){
156 if(!memcmp(basename(lfields[5]), "libsimgrid", 10)){
157 tok = strtok(NULL, "-");
158 end_addr = (void *)strtoul(tok, NULL, 16);
159 size = (char*)end_addr - (char*)start_addr;
160 /* BSS and data segments may be separated according to the OS */
161 if((read = xbt_getline(&line, &n, fp)) != -1){
162 line[read - 1] = '\0';
163 lfields[0] = strtok(line, " ");
164 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
165 lfields[i] = strtok(NULL, " ");
167 if(lfields[1][1] == 'w' && lfields[5] == NULL){
168 tok = strtok(lfields[0], "-");
169 start_addr1 = (void *)strtoul(tok, NULL, 16);
170 tok = strtok(NULL, "-");
171 size += (char *)(void *)strtoul(tok, NULL, 16) - (char*)start_addr1;
174 MC_snapshot_add_region(snapshot, 1, start_addr, size);
175 }else if(!memcmp(basename(lfields[5]), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
176 tok = strtok(NULL, "-");
177 end_addr = (void *)strtoul(tok, NULL, 16);
178 size = (char*)end_addr - (char*)start_addr;
179 /* BSS and data segments may be separated according to the OS */
180 if((read = xbt_getline(&line, &n, fp)) != -1){
181 line[read - 1] = '\0';
182 lfields[0] = strtok(line, " ");
183 for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) {
184 lfields[i] = strtok(NULL, " ");
186 tok = strtok(lfields[0], "-");
187 start_addr1 = (void *)strtoul(tok, NULL, 16);
188 if(lfields[1][1] == 'w'){
189 if(start_addr1 == std_heap){ /* Std_heap ? */
191 }else if(start_addr1 != raw_heap){
192 tok = strtok(NULL, "-");
193 size += (char *)(void *)strtoul(tok, NULL, 16) - (char *)start_addr1;
197 MC_snapshot_add_region(snapshot, 2, start_addr, size);
198 }else if (!memcmp(lfields[5], "[stack]", 7)){
199 maestro_stack_start = start_addr;
200 tok = strtok(NULL, "-");
201 maestro_stack_end = (void *)strtoul(tok, NULL, 16);
214 /** @brief Finds the range of the different memory segments and binary paths */
215 void MC_init_memory_map_info(){
219 memory_map_t maps = MC_get_memory_map();
221 maestro_stack_start = NULL;
222 maestro_stack_end = NULL;
223 libsimgrid_path = NULL;
225 while (i < maps->mapsize) {
226 reg = maps->regions[i];
227 if (maps->regions[i].pathname == NULL) {
230 else if ((reg.prot & PROT_WRITE) && !memcmp(maps->regions[i].pathname, "[stack]", 7)){
231 maestro_stack_start = reg.start_addr;
232 maestro_stack_end = reg.end_addr;
233 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
234 if(libsimgrid_path == NULL)
235 libsimgrid_path = strdup(maps->regions[i].pathname);
240 xbt_assert(maestro_stack_start, "maestro_stack_start");
241 xbt_assert(maestro_stack_end, "maestro_stack_end");
242 xbt_assert(libsimgrid_path, "libsimgrid_path&");
244 MC_free_memory_map(maps);
248 /** \brief Fill/llokup the "subtype" field.
250 static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) {
252 if(type->dw_type_id==NULL)
254 type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
255 if(type->subtype==NULL)
257 if(type->subtype->byte_size != 0)
259 if(type->subtype->name==NULL)
261 // Try to find a more complete description of the type:
262 // We need to fix in order to support C++.
264 dw_type_t subtype = xbt_dict_get_or_null(info->types_by_name, type->subtype->name);
266 type->subtype = subtype;
269 // TODO, support "switch type" (looking up the type in another lib) when possible
272 static void MC_post_process_types(mc_object_info_t info) {
273 xbt_dict_cursor_t cursor = NULL;
277 // Lookup "subtype" field:
278 xbt_dict_foreach(info->types, cursor, origin, type){
279 MC_resolve_subtype(info, type);
283 if(type->members!=NULL) xbt_dynar_foreach(type->members, i, member) {
284 MC_resolve_subtype(info, member);
289 /** \brief Finds informations about a given shared object/executable */
290 mc_object_info_t MC_find_object_info(memory_map_t maps, char* name) {
291 mc_object_info_t result = MC_new_object_info();
292 result->file_name = xbt_strdup(name);
293 MC_find_object_address(maps, result);
294 MC_dwarf_get_variables(result);
295 MC_post_process_types(result);
299 /** \brief Fills the position of the .bss and .data sections. */
300 static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) {
304 const char* name = basename(result->file_name);
305 while (i < maps->mapsize) {
306 reg = maps->regions[i];
307 if (maps->regions[i].pathname == NULL || strcmp(basename(maps->regions[i].pathname), name)) {
310 else if ((reg.prot & PROT_WRITE)){
311 xbt_assert(!result->start_rw,
312 "Multiple read-write segments for %s, not supported",
313 maps->regions[i].pathname);
314 result->start_rw = reg.start_addr;
315 result->end_rw = reg.end_addr;
316 // .bss is usually after the .data:
317 // TODO, use dl_iterate_phdr to be more robust
318 s_map_region_t* next = &(maps->regions[i+1]);
319 if(next->pathname == NULL && (next->prot & PROT_WRITE) && next->start_addr == reg.end_addr) {
320 result->end_rw = maps->regions[i+1].end_addr;
322 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
323 xbt_assert(!result->start_exec,
324 "Multiple executable segments for %s, not supported",
325 maps->regions[i].pathname);
326 result->start_exec = reg.start_addr;
327 result->end_exec = reg.end_addr;
329 else if((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
330 xbt_assert(!result->start_ro,
331 "Multiple read only segments for %s, not supported",
332 maps->regions[i].pathname);
333 result->start_ro = reg.start_addr;
334 result->end_ro = reg.end_addr;
339 xbt_assert(result->file_name);
340 xbt_assert(result->start_rw);
341 xbt_assert(result->start_exec);
344 /************************************* Take Snapshot ************************************/
345 /****************************************************************************************/
347 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){
349 unsigned cursor1 = 0;
350 mc_stack_frame_t stack_frame;
351 xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
353 xbt_dynar_foreach(stack_frames,cursor1,stack_frame) {
355 unsigned cursor2 = 0;
356 dw_variable_t current_variable;
357 xbt_dynar_foreach(stack_frame->frame->variables, cursor2, current_variable){
360 if((long)stack_frame->ip > (long)mc_libsimgrid_info->start_exec)
365 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
366 new_var->frame = xbt_strdup(stack_frame->frame_name);
367 new_var->ip = stack_frame->ip;
368 new_var->name = xbt_strdup(current_variable->name);
369 new_var->type = strdup(current_variable->type_origin);
370 new_var->region= region_type;
372 /* if(current_variable->address!=NULL) {
373 new_var->address = current_variable->address;
375 if(current_variable->location != NULL){
376 new_var->address = (void*) MC_dwarf_resolve_location(
377 &(stack_frame->unw_cursor), current_variable->location, (void*)stack_frame->frame_base);
380 xbt_dynar_push(variables, &new_var);
389 static void MC_stack_frame_free_voipd(void *s){
390 mc_stack_frame_t stack_frame = *(mc_stack_frame_t*)s;
392 xbt_free(stack_frame->frame_name);
393 xbt_free(stack_frame);
397 static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) {
398 xbt_dynar_t result = xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
402 char frame_name[256];
405 for(ret = unw_init_local(&c, (unw_context_t *)stack_context); ret >= 0; ret = unw_step(&c)){
406 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
407 xbt_dynar_push(result, &stack_frame);
409 stack_frame->unw_cursor = c;
411 unw_get_reg(&c, UNW_REG_IP, &stack_frame->ip);
412 unw_get_reg(&c, UNW_REG_SP, &stack_frame->sp);
415 unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off);
416 stack_frame->frame_name = xbt_strdup(frame_name);
419 if((long)stack_frame->ip > (long) mc_libsimgrid_info->start_exec)
420 frame = xbt_dict_get_or_null(mc_libsimgrid_info->local_variables, frame_name);
422 frame = xbt_dict_get_or_null(mc_binary_info->local_variables, frame_name);
423 stack_frame->frame = frame;
426 unw_word_t normalized_ip = (unw_word_t)frame->low_pc + (unw_word_t)off;
427 stack_frame->frame_base = (unw_word_t)mc_find_frame_base(normalized_ip, frame, &c);
429 stack_frame->frame_base = 0;
432 /* Stop before context switch with maestro */
433 if(!strcmp(frame_name, "smx_ctx_sysv_wrapper"))
437 if(xbt_dynar_length(result) == 0){
438 XBT_INFO("unw_init_local failed");
445 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){
447 xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), MC_snapshot_stack_free_voidp);
449 unsigned int cursor = 0;
450 stack_region_t current_stack;
452 xbt_dynar_foreach(stacks_areas, cursor, current_stack){
453 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
454 st->stack_frames = MC_unwind_stack_frames(current_stack->context);
455 st->local_variables = MC_get_local_variables_values(st->stack_frames);
457 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
458 st->stack_pointer = ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
460 st->real_address = current_stack->address;
461 xbt_dynar_push(res, &st);
462 (*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
463 (*snapshot)->stack_sizes[cursor] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap)));
470 static xbt_dynar_t MC_take_snapshot_ignore(){
472 if(mc_heap_comparison_ignore == NULL)
475 xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp);
477 unsigned int cursor = 0;
478 mc_heap_ignore_region_t current_region;
480 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region){
481 mc_heap_ignore_region_t new_region = NULL;
482 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
483 new_region->address = current_region->address;
484 new_region->size = current_region->size;
485 new_region->block = current_region->block;
486 new_region->fragment = current_region->fragment;
487 xbt_dynar_push(cpy, &new_region);
494 static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){
496 unsigned int cursor = 0;
497 mc_checkpoint_ignore_region_t region;
500 xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){
501 if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){
502 offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr;
503 memset((char *)snapshot->regions[0]->data + offset, 0, region->size);
504 }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){
505 offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr;
506 memset((char *)snapshot->regions[2]->data + offset, 0, region->size);
507 }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){
508 offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr;
509 memset((char *)snapshot->regions[1]->data + offset, 0, region->size);
516 mc_snapshot_t MC_take_snapshot(int num_state){
518 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
519 snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
521 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
522 MC_get_memory_regions(snapshot);
524 snapshot->to_ignore = MC_take_snapshot_ignore();
526 if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){
527 snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data);
528 if(_sg_mc_hash && snapshot->stacks!=NULL) {
529 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
539 MC_dump_checkpoint_ignore(snapshot);
545 void MC_restore_snapshot(mc_snapshot_t snapshot){
547 for(i=0; i < NB_REGIONS; i++){
548 MC_region_restore(snapshot->regions[i]);
553 mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
554 return MC_take_snapshot(1);
557 void *MC_snapshot(void){
558 return simcall_mc_snapshot();