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>
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 /************************************ 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){
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){
107 void* start_heap = ((xbt_mheap_t)std_heap)->base;
108 void* end_heap = ((xbt_mheap_t)std_heap)->breakval;
109 MC_snapshot_add_region(snapshot, 0, start_heap, (char*) end_heap - (char*) start_heap);
110 snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap);
112 MC_snapshot_add_region(snapshot, 1, mc_libsimgrid_info->start_rw, mc_libsimgrid_info->end_rw - mc_libsimgrid_info->start_rw);
113 MC_snapshot_add_region(snapshot, 2, mc_binary_info->start_rw, mc_binary_info->end_rw - mc_binary_info->start_rw);
116 /** @brief Finds the range of the different memory segments and binary paths */
117 void MC_init_memory_map_info(){
121 memory_map_t maps = MC_get_memory_map();
123 maestro_stack_start = NULL;
124 maestro_stack_end = NULL;
125 libsimgrid_path = NULL;
127 while (i < maps->mapsize) {
128 reg = maps->regions[i];
129 if (maps->regions[i].pathname == NULL) {
132 else if ((reg.prot & PROT_WRITE) && !memcmp(maps->regions[i].pathname, "[stack]", 7)){
133 maestro_stack_start = reg.start_addr;
134 maestro_stack_end = reg.end_addr;
135 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
136 if(libsimgrid_path == NULL)
137 libsimgrid_path = strdup(maps->regions[i].pathname);
142 xbt_assert(maestro_stack_start, "maestro_stack_start");
143 xbt_assert(maestro_stack_end, "maestro_stack_end");
144 xbt_assert(libsimgrid_path, "libsimgrid_path&");
146 MC_free_memory_map(maps);
150 /** \brief Fill/lookup the "subtype" field.
152 static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) {
154 if(type->dw_type_id==NULL)
156 type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id);
157 if(type->subtype==NULL)
159 if(type->subtype->byte_size != 0)
161 if(type->subtype->name==NULL)
163 // Try to find a more complete description of the type:
164 // We need to fix in order to support C++.
166 dw_type_t subtype = xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name);
168 type->subtype = subtype;
173 void MC_post_process_types(mc_object_info_t info) {
174 xbt_dict_cursor_t cursor = NULL;
178 // Lookup "subtype" field:
179 xbt_dict_foreach(info->types, cursor, origin, type){
180 MC_resolve_subtype(info, type);
184 if(type->members!=NULL) xbt_dynar_foreach(type->members, i, member) {
185 MC_resolve_subtype(info, member);
190 /** \brief Fills the position of the segments (executable, read-only, read/write).
192 * TODO, use dl_iterate_phdr to be more robust
194 void MC_find_object_address(memory_map_t maps, mc_object_info_t result) {
198 const char* name = basename(result->file_name);
199 while (i < maps->mapsize) {
200 reg = maps->regions[i];
201 if (maps->regions[i].pathname == NULL || strcmp(basename(maps->regions[i].pathname), name)) {
204 else if ((reg.prot & PROT_WRITE)){
205 xbt_assert(!result->start_rw,
206 "Multiple read-write segments for %s, not supported",
207 maps->regions[i].pathname);
208 result->start_rw = reg.start_addr;
209 result->end_rw = reg.end_addr;
210 // .bss is usually after the .data:
211 s_map_region_t* next = &(maps->regions[i+1]);
212 if(next->pathname == NULL && (next->prot & PROT_WRITE) && next->start_addr == reg.end_addr) {
213 result->end_rw = maps->regions[i+1].end_addr;
215 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
216 xbt_assert(!result->start_exec,
217 "Multiple executable segments for %s, not supported",
218 maps->regions[i].pathname);
219 result->start_exec = reg.start_addr;
220 result->end_exec = reg.end_addr;
222 else if((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
223 xbt_assert(!result->start_ro,
224 "Multiple read only segments for %s, not supported",
225 maps->regions[i].pathname);
226 result->start_ro = reg.start_addr;
227 result->end_ro = reg.end_addr;
232 xbt_assert(result->file_name);
233 xbt_assert(result->start_rw);
234 xbt_assert(result->start_exec);
237 /************************************* Take Snapshot ************************************/
238 /****************************************************************************************/
240 /** \brief Checks whether the variable is in scope for a given IP.
242 * A variable may be defined only from a given value of IP.
244 * \param var Variable description
245 * \param frame Scope description
246 * \param ip Instruction pointer
247 * \return true if the variable is valid
249 static bool mc_valid_variable(dw_variable_t var, dw_frame_t frame, const void* ip) {
250 // The variable is not yet valid:
251 if((const void*)((const char*) frame->low_pc + var->start_scope) > ip)
257 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){
259 unsigned cursor1 = 0;
260 mc_stack_frame_t stack_frame;
261 xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
263 xbt_dynar_foreach(stack_frames,cursor1,stack_frame) {
265 unsigned cursor2 = 0;
266 dw_variable_t current_variable;
267 xbt_dynar_foreach(stack_frame->frame->variables, cursor2, current_variable){
269 if(!mc_valid_variable(current_variable, stack_frame->frame, (void*) stack_frame->ip))
273 if((long)stack_frame->ip > (long)mc_libsimgrid_info->start_exec)
278 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
279 new_var->frame = xbt_strdup(stack_frame->frame_name);
280 new_var->ip = stack_frame->ip;
281 new_var->name = xbt_strdup(current_variable->name);
282 new_var->type = current_variable->type;
283 new_var->region= region_type;
285 /* if(current_variable->address!=NULL) {
286 new_var->address = current_variable->address;
288 if(current_variable->locations.size != 0){
289 new_var->address = (void*) mc_dwarf_resolve_locations(¤t_variable->locations,
290 &(stack_frame->unw_cursor), (void*)stack_frame->frame_base, NULL);
293 xbt_dynar_push(variables, &new_var);
302 static void MC_stack_frame_free_voipd(void *s){
303 mc_stack_frame_t stack_frame = *(mc_stack_frame_t*)s;
305 xbt_free(stack_frame->frame_name);
306 xbt_free(stack_frame);
310 static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) {
311 xbt_dynar_t result = xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
316 for(ret = unw_init_local(&c, (unw_context_t *)stack_context); ret >= 0; ret = unw_step(&c)){
317 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
318 xbt_dynar_push(result, &stack_frame);
320 stack_frame->unw_cursor = c;
324 unw_get_reg(&c, UNW_REG_IP, &ip);
325 unw_get_reg(&c, UNW_REG_SP, &sp);
327 stack_frame->ip = ip;
328 stack_frame->sp = sp;
330 // TODO, use real addresses in frame_t instead of fixing it here
332 dw_frame_t frame = MC_find_function_by_ip((void*) ip);
333 stack_frame->frame = frame;
336 stack_frame->frame_name = xbt_strdup(frame->name);
337 stack_frame->frame_base = (unw_word_t)mc_find_frame_base(frame, &c);
339 stack_frame->frame_base = 0;
342 /* Stop before context switch with maestro */
343 if(frame!=NULL && frame->name!=NULL && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
347 if(xbt_dynar_length(result) == 0){
348 XBT_INFO("unw_init_local failed");
355 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){
357 xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), MC_snapshot_stack_free_voidp);
359 unsigned int cursor = 0;
360 stack_region_t current_stack;
362 xbt_dynar_foreach(stacks_areas, cursor, current_stack){
363 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
364 st->stack_frames = MC_unwind_stack_frames(current_stack->context);
365 st->local_variables = MC_get_local_variables_values(st->stack_frames);
367 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
368 st->stack_pointer = ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
370 st->real_address = current_stack->address;
371 xbt_dynar_push(res, &st);
372 (*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
373 (*snapshot)->stack_sizes[cursor] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap)));
380 static xbt_dynar_t MC_take_snapshot_ignore(){
382 if(mc_heap_comparison_ignore == NULL)
385 xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp);
387 unsigned int cursor = 0;
388 mc_heap_ignore_region_t current_region;
390 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region){
391 mc_heap_ignore_region_t new_region = NULL;
392 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
393 new_region->address = current_region->address;
394 new_region->size = current_region->size;
395 new_region->block = current_region->block;
396 new_region->fragment = current_region->fragment;
397 xbt_dynar_push(cpy, &new_region);
404 static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){
406 unsigned int cursor = 0;
407 mc_checkpoint_ignore_region_t region;
410 xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){
411 if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){
412 offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr;
413 memset((char *)snapshot->regions[0]->data + offset, 0, region->size);
414 }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){
415 offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr;
416 memset((char *)snapshot->regions[2]->data + offset, 0, region->size);
417 }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){
418 offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr;
419 memset((char *)snapshot->regions[1]->data + offset, 0, region->size);
426 mc_snapshot_t MC_take_snapshot(int num_state){
428 mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
429 snapshot->nb_processes = xbt_swag_size(simix_global->process_list);
431 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
432 MC_get_memory_regions(snapshot);
434 snapshot->to_ignore = MC_take_snapshot_ignore();
436 if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){
437 snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data);
438 if(_sg_mc_hash && snapshot->stacks!=NULL) {
439 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
449 MC_dump_checkpoint_ignore(snapshot);
455 void MC_restore_snapshot(mc_snapshot_t snapshot){
457 for(i=0; i < NB_REGIONS; i++){
458 MC_region_restore(snapshot->regions[i]);
463 void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot) {
465 // If not in a process state/clone:
467 return (uintptr_t*) addr;
470 // If it is in a snapshot:
471 for(size_t i=0; i!=NB_REGIONS; ++i) {
472 mc_mem_region_t region = snapshot->regions[i];
473 uintptr_t start = (uintptr_t) region->start_addr;
474 uintptr_t end = start + region->size;
476 // The address is in this region:
477 if(addr >= start && addr < end) {
478 uintptr_t offset = addr - start;
479 return (void*) ((uintptr_t)region->data + offset);
484 // It is not in a snapshot:
488 uintptr_t mc_untranslate_address(void* addr, mc_snapshot_t snapshot) {
490 return (uintptr_t) addr;
493 for(size_t i=0; i!=NB_REGIONS; ++i) {
494 mc_mem_region_t region = snapshot->regions[i];
495 if(addr>=region->data && addr<=(void*)(((char*)region->data)+region->size)) {
496 size_t offset = (size_t) ((char*) addr - (char*) region->data);
497 return ((uintptr_t) region->start_addr) + offset;
501 return (uintptr_t) addr;
504 mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
505 return MC_take_snapshot(1);
508 void *MC_snapshot(void){
509 return simcall_mc_snapshot();