1 /* Copyright (c) 2008-2014. 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. */
12 #include "mc_private.h"
13 #include "xbt/module.h"
14 #include <xbt/mmalloc.h>
15 #include "../smpi/private.h"
17 #include "xbt/mmalloc/mmprivate.h"
19 #include "../simix/smx_private.h"
21 #include <libunwind.h>
24 #include "mc_private.h"
26 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
27 "Logging specific to mc_checkpoint");
29 char *libsimgrid_path;
31 /************************************ Free functions **************************************/
32 /*****************************************************************************************/
34 static void MC_snapshot_stack_free(mc_snapshot_stack_t s){
36 xbt_dynar_free(&(s->local_variables));
37 xbt_dynar_free(&(s->stack_frames));
42 static void MC_snapshot_stack_free_voidp(void *s){
43 MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
46 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)
57 //munmap(reg->data, reg->size);
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));
71 if(snapshot->privatization_regions){
72 size_t n = snapshot->nb_processes;
74 MC_region_destroy(snapshot->privatization_regions[i]);
76 xbt_free(snapshot->privatization_regions);
83 /******************************* Snapshot regions ********************************/
84 /*********************************************************************************/
86 static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
88 mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
89 new_reg->start_addr = start_addr;
91 //new_reg->data = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
92 //if(new_reg->data==MAP_FAILED)
93 //xbt_die("Could not mmap new memory for snapshot.");
94 new_reg->data = xbt_malloc(size);
95 memcpy(new_reg->data, start_addr, size);
96 //madvise(new_reg->data, size, MADV_MERGEABLE);
98 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
103 static void MC_region_restore(mc_mem_region_t reg)
105 /*FIXME: check if start_addr is still mapped, if it is not, then map it
106 before copying the data */
108 memcpy(reg->start_addr, reg->data, reg->size);
112 static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
114 mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
115 snapshot->regions[type] = new_reg;
119 static void MC_get_memory_regions(mc_snapshot_t snapshot){
122 void* start_heap = ((xbt_mheap_t)std_heap)->base;
123 void* end_heap = ((xbt_mheap_t)std_heap)->breakval;
124 MC_snapshot_add_region(snapshot, 0, start_heap, (char*) end_heap - (char*) start_heap);
125 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
127 MC_snapshot_add_region(snapshot, 1, mc_libsimgrid_info->start_rw, mc_libsimgrid_info->end_rw - mc_libsimgrid_info->start_rw);
128 if(!smpi_privatize_global_variables) {
129 MC_snapshot_add_region(snapshot, 2, mc_binary_info->start_rw, mc_binary_info->end_rw - mc_binary_info->start_rw);
130 snapshot->privatization_regions = NULL;
131 snapshot->privatization_index = -1;
133 snapshot->privatization_regions = xbt_new(mc_mem_region_t, SIMIX_process_count());
134 for (i=0; i< SIMIX_process_count(); i++){
135 snapshot->privatization_regions[i] = MC_region_new(-1, mappings[i], size_data_exe);
137 snapshot->privatization_index = loaded_page;
141 /** @brief Finds the range of the different memory segments and binary paths */
142 void MC_init_memory_map_info(){
146 memory_map_t maps = MC_get_memory_map();
148 maestro_stack_start = NULL;
149 maestro_stack_end = NULL;
150 libsimgrid_path = NULL;
152 while (i < maps->mapsize) {
153 reg = maps->regions[i];
154 if (maps->regions[i].pathname == NULL) {
157 else if ((reg.prot & PROT_WRITE) && !memcmp(maps->regions[i].pathname, "[stack]", 7)){
158 maestro_stack_start = reg.start_addr;
159 maestro_stack_end = reg.end_addr;
160 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
161 if(libsimgrid_path == NULL)
162 libsimgrid_path = strdup(maps->regions[i].pathname);
167 xbt_assert(maestro_stack_start, "maestro_stack_start");
168 xbt_assert(maestro_stack_end, "maestro_stack_end");
169 xbt_assert(libsimgrid_path, "libsimgrid_path&");
171 MC_free_memory_map(maps);
175 /** \brief Fill/lookup the "subtype" field.
177 static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) {
179 if(type->dw_type_id==NULL)
181 type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
182 if(type->subtype==NULL)
184 if(type->subtype->byte_size != 0)
186 if(type->subtype->name==NULL)
188 // Try to find a more complete description of the type:
189 // We need to fix in order to support C++.
191 dw_type_t subtype = xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name);
193 type->subtype = subtype;
198 void MC_post_process_types(mc_object_info_t info) {
199 xbt_dict_cursor_t cursor = NULL;
203 // Lookup "subtype" field:
204 xbt_dict_foreach(info->types, cursor, origin, type){
205 MC_resolve_subtype(info, type);
209 if(type->members!=NULL) xbt_dynar_foreach(type->members, i, member) {
210 MC_resolve_subtype(info, member);
215 /** \brief Fills the position of the segments (executable, read-only, read/write).
217 * TODO, use dl_iterate_phdr to be more robust
219 void MC_find_object_address(memory_map_t maps, mc_object_info_t result) {
223 const char* name = basename(result->file_name);
224 while (i < maps->mapsize) {
225 reg = maps->regions[i];
226 if (maps->regions[i].pathname == NULL || strcmp(basename(maps->regions[i].pathname), name)) {
229 else if ((reg.prot & PROT_WRITE)){
230 xbt_assert(!result->start_rw,
231 "Multiple read-write segments for %s, not supported",
232 maps->regions[i].pathname);
233 result->start_rw = reg.start_addr;
234 result->end_rw = reg.end_addr;
235 // .bss is usually after the .data:
236 s_map_region_t* next = &(maps->regions[i+1]);
237 if(next->pathname == NULL && (next->prot & PROT_WRITE) && next->start_addr == reg.end_addr) {
238 result->end_rw = maps->regions[i+1].end_addr;
240 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
241 xbt_assert(!result->start_exec,
242 "Multiple executable segments for %s, not supported",
243 maps->regions[i].pathname);
244 result->start_exec = reg.start_addr;
245 result->end_exec = reg.end_addr;
247 else if((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
248 xbt_assert(!result->start_ro,
249 "Multiple read only segments for %s, not supported",
250 maps->regions[i].pathname);
251 result->start_ro = reg.start_addr;
252 result->end_ro = reg.end_addr;
257 xbt_assert(result->file_name);
258 xbt_assert(result->start_rw);
259 xbt_assert(result->start_exec);
262 /************************************* Take Snapshot ************************************/
263 /****************************************************************************************/
265 /** \brief Checks whether the variable is in scope for a given IP.
267 * A variable may be defined only from a given value of IP.
269 * \param var Variable description
270 * \param frame Scope description
271 * \param ip Instruction pointer
272 * \return true if the variable is valid
274 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope, const void* ip) {
275 // The variable is not yet valid:
276 if((const void*)((const char*) scope->low_pc + var->start_scope) > ip)
282 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame, dw_frame_t scope, xbt_dynar_t result) {
283 void* ip = (void*) stack_frame->ip;
284 if(ip < scope->low_pc || ip>= scope->high_pc)
288 dw_variable_t current_variable;
289 xbt_dynar_foreach(scope->variables, cursor, current_variable){
291 if(!mc_valid_variable(current_variable, scope, (void*) stack_frame->ip))
295 if((long)stack_frame->ip > (long)mc_libsimgrid_info->start_exec)
300 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
301 new_var->subprogram = stack_frame->frame;
302 new_var->ip = stack_frame->ip;
303 new_var->name = xbt_strdup(current_variable->name);
304 new_var->type = current_variable->type;
305 new_var->region= region_type;
307 if(current_variable->address!=NULL) {
308 new_var->address = current_variable->address;
310 if(current_variable->locations.size != 0){
311 new_var->address = (void*) mc_dwarf_resolve_locations(¤t_variable->locations,
312 current_variable->object_info,
313 &(stack_frame->unw_cursor), (void*)stack_frame->frame_base, NULL);
315 xbt_die("No address");
318 xbt_dynar_push(result, &new_var);
321 // Recursive processing of nested scopes:
322 dw_frame_t nested_scope = NULL;
323 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
324 mc_fill_local_variables_values(stack_frame, nested_scope, result);
328 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){
330 unsigned cursor1 = 0;
331 mc_stack_frame_t stack_frame;
332 xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
334 xbt_dynar_foreach(stack_frames,cursor1,stack_frame) {
335 mc_fill_local_variables_values(stack_frame, stack_frame->frame, variables);
341 static void MC_stack_frame_free_voipd(void *s){
342 mc_stack_frame_t stack_frame = *(mc_stack_frame_t*)s;
344 xbt_free(stack_frame->frame_name);
345 xbt_free(stack_frame);
349 static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) {
350 xbt_dynar_t result = xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
354 // TODO, check condition check (unw_init_local==0 means end of frame)
355 if(unw_init_local(&c, (unw_context_t *)stack_context)!=0) {
357 xbt_die("Could not initialize stack unwinding");
361 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
362 xbt_dynar_push(result, &stack_frame);
364 stack_frame->unw_cursor = c;
368 unw_get_reg(&c, UNW_REG_IP, &ip);
369 unw_get_reg(&c, UNW_REG_SP, &sp);
371 stack_frame->ip = ip;
372 stack_frame->sp = sp;
374 // TODO, use real addresses in frame_t instead of fixing it here
376 dw_frame_t frame = MC_find_function_by_ip((void*) ip);
377 stack_frame->frame = frame;
380 stack_frame->frame_name = xbt_strdup(frame->name);
381 stack_frame->frame_base = (unw_word_t)mc_find_frame_base(frame, frame->object_info, &c);
383 stack_frame->frame_base = 0;
384 stack_frame->frame_name = NULL;
387 /* Stop before context switch with maestro */
388 if(frame!=NULL && frame->name!=NULL && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
391 int ret = ret = unw_step(&c);
393 xbt_die("Unexpected end of stack.");
395 xbt_die("Error while unwinding stack.");
399 if(xbt_dynar_length(result) == 0){
400 XBT_INFO("unw_init_local failed");
407 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){
409 xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), MC_snapshot_stack_free_voidp);
411 unsigned int cursor = 0;
412 stack_region_t current_stack;
414 xbt_dynar_foreach(stacks_areas, cursor, current_stack){
415 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
416 st->stack_frames = MC_unwind_stack_frames(current_stack->context);
417 st->local_variables = MC_get_local_variables_values(st->stack_frames);
419 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
420 st->stack_pointer = ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
422 st->real_address = current_stack->address;
423 xbt_dynar_push(res, &st);
424 (*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
425 (*snapshot)->stack_sizes[cursor] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap)));
432 static xbt_dynar_t MC_take_snapshot_ignore(){
434 if(mc_heap_comparison_ignore == NULL)
437 xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp);
439 unsigned int cursor = 0;
440 mc_heap_ignore_region_t current_region;
442 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region){
443 mc_heap_ignore_region_t new_region = NULL;
444 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
445 new_region->address = current_region->address;
446 new_region->size = current_region->size;
447 new_region->block = current_region->block;
448 new_region->fragment = current_region->fragment;
449 xbt_dynar_push(cpy, &new_region);
456 static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){
458 unsigned int cursor = 0;
459 mc_checkpoint_ignore_region_t region;
462 xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){
463 if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){
464 offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr;
465 memset((char *)snapshot->regions[0]->data + offset, 0, region->size);
466 }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){
467 offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr;
468 memset((char *)snapshot->regions[2]->data + offset, 0, region->size);
469 }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){
470 offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr;
471 memset((char *)snapshot->regions[1]->data + offset, 0, region->size);
478 mc_snapshot_t MC_take_snapshot(int num_state){
480 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
481 snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
483 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
484 MC_get_memory_regions(snapshot);
486 snapshot->to_ignore = MC_take_snapshot_ignore();
488 if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){
489 snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data);
490 if(_sg_mc_hash && snapshot->stacks!=NULL) {
491 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
501 MC_dump_checkpoint_ignore(snapshot);
503 // mprotect the region after zero-ing ignored parts:
505 for(i=0; i!=NB_REGIONS; ++i) {
506 mc_mem_region_t region = snapshot->regions[i];
507 mprotect(region->data, region->size, PROT_READ);
514 void MC_restore_snapshot(mc_snapshot_t snapshot){
516 for(i=0; i < NB_REGIONS; i++){
517 // For privatized, variables we decided it was not necessary to take the snapshot:
518 if(snapshot->regions[i])
519 MC_region_restore(snapshot->regions[i]);
522 if(snapshot->privatization_regions) {
523 for (i=0; i< SIMIX_process_count(); i++){
524 if(snapshot->privatization_regions[i]) {
525 MC_region_restore(snapshot->privatization_regions[i]);
528 switch_data_segment(snapshot->privatization_index);
532 void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot) {
534 // If not in a process state/clone:
536 return (uintptr_t*) addr;
539 // If it is in a snapshot:
540 for(size_t i=0; i!=NB_REGIONS; ++i) {
541 mc_mem_region_t region = snapshot->regions[i];
542 uintptr_t start = (uintptr_t) region->start_addr;
543 uintptr_t end = start + region->size;
545 // The address is in this region:
546 if(addr >= start && addr < end) {
547 uintptr_t offset = addr - start;
548 return (void*) ((uintptr_t)region->data + offset);
553 // It is not in a snapshot:
557 uintptr_t mc_untranslate_address(void* addr, mc_snapshot_t snapshot) {
559 return (uintptr_t) addr;
562 for(size_t i=0; i!=NB_REGIONS; ++i) {
563 mc_mem_region_t region = snapshot->regions[i];
564 if(addr>=region->data && addr<=(void*)(((char*)region->data)+region->size)) {
565 size_t offset = (size_t) ((char*) addr - (char*) region->data);
566 return ((uintptr_t) region->start_addr) + offset;
570 return (uintptr_t) addr;
573 mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
574 return MC_take_snapshot(1);
577 void *MC_snapshot(void){
578 return simcall_mc_snapshot();