1 /* Copyright (c) 2007-2014. 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. */
10 #include "simgrid_config.h"
16 #include <elfutils/libdw.h>
20 #include "mc/datatypes.h"
22 #include "xbt/config.h"
23 #include "xbt/function_types.h"
24 #include "xbt/mmalloc.h"
25 #include "../simix/smx_private.h"
26 #include "../xbt/mmalloc/mmprivate.h"
27 #include "xbt/automaton.h"
30 #include "msg/datatypes.h"
31 #include "xbt/strbuff.h"
32 #include "xbt/parmap.h"
34 #include "mc_page_store.h"
35 #include "mc_interface.h"
39 typedef struct s_dw_frame s_dw_frame_t, *dw_frame_t;
40 typedef struct s_mc_function_index_item s_mc_function_index_item_t, *mc_function_index_item_t;
42 /****************************** Snapshots ***********************************/
44 #define NB_REGIONS 3 /* binary data (data + BSS) (type = 2), libsimgrid data (data + BSS) (type = 1), std_heap (type = 0)*/
46 /** @brief Copy/snapshot of a given memory region
48 * Two types of region snapshots exist:
50 * <li>flat/dense snapshots are a simple copy of the region;</li>
51 * <li>sparse/per-page snapshots are snaapshots which shared
52 * identical pages.</li>
55 typedef struct s_mc_mem_region{
56 /** @brief Virtual address of the region in the simulated process */
59 /** @brief Permanent virtual address of the region
61 * This is usually the same address as the simuilated process address.
62 * However, when using SMPI privatization of global variables,
63 * each SMPI process has its own set of global variables stored
64 * at a different virtual address. The scheduler maps those region
65 * on the region of the global variables.
70 /** @brief Copy of the snapshot for flat snapshots regions (NULL otherwise) */
73 /** @brief Size of the data region in bytes */
76 /** @brief Pages indices in the page store for per-page snapshots (NULL otherwise) */
79 } s_mc_mem_region_t, *mc_mem_region_t;
81 static inline __attribute__ ((always_inline))
82 bool mc_region_contain(mc_mem_region_t region, void* p)
84 return p >= region->start_addr &&
85 p < (void*)((char*) region->start_addr + region->size);
90 * Some parts of the snapshot are ignored by zeroing them out: the real
91 * values is stored here.
93 typedef struct s_mc_snapshot_ignored_data {
97 } s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t;
99 typedef struct s_fd_infos{
102 off_t current_position;
104 }s_fd_infos_t, *fd_infos_t;
106 typedef struct s_mc_snapshot{
107 size_t heap_bytes_used;
108 mc_mem_region_t regions[NB_REGIONS];
109 xbt_dynar_t enabled_processes;
110 mc_mem_region_t* privatization_regions;
111 int privatization_index;
114 xbt_dynar_t to_ignore;
116 xbt_dynar_t ignored_data;
118 fd_infos_t *current_fd;
122 /** @brief Process index used when no process is available
124 * The expected behaviour is that if a process index is needed it will fail.
126 #define MC_NO_PROCESS_INDEX -1
128 /** @brief Process index when any process is suitable
130 * We could use a special negative value in the future.
132 #define MC_ANY_PROCESS_INDEX 0
134 mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot, int process_index);
136 static inline __attribute__ ((always_inline))
137 mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
139 if (mc_region_contain(region, addr))
142 return mc_get_snapshot_region(addr, snapshot, process_index);
145 /** Information about a given stack frame
148 typedef struct s_mc_stack_frame {
149 /** Instruction pointer */
153 unw_word_t frame_base;
156 unw_cursor_t unw_cursor;
157 } s_mc_stack_frame_t, *mc_stack_frame_t;
159 typedef struct s_mc_snapshot_stack{
160 xbt_dynar_t local_variables;
161 xbt_dynar_t stack_frames; // mc_stack_frame_t
163 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
165 typedef struct s_mc_global_t{
166 mc_snapshot_t snapshot;
170 int initial_communications_pattern_done;
171 int comm_deterministic;
172 int send_deterministic;
173 }s_mc_global_t, *mc_global_t;
175 typedef struct s_mc_checkpoint_ignore_region{
178 }s_mc_checkpoint_ignore_region_t, *mc_checkpoint_ignore_region_t;
180 static void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot);
182 mc_snapshot_t MC_take_snapshot(int num_state);
183 void MC_restore_snapshot(mc_snapshot_t);
184 void MC_free_snapshot(mc_snapshot_t);
186 int mc_important_snapshot(mc_snapshot_t snapshot);
188 size_t* mc_take_page_snapshot_region(void* data, size_t page_count, uint64_t* pagemap, size_t* reference_pages);
189 void mc_free_page_snapshot_region(size_t* pagenos, size_t page_count);
190 void mc_restore_page_snapshot_region(void* start_addr, size_t page_count, size_t* pagenos, uint64_t* pagemap, size_t* reference_pagenos);
192 mc_mem_region_t mc_region_new_sparse(int type, void *start_addr, void* data_addr, size_t size, mc_mem_region_t ref_reg);
193 void MC_region_destroy(mc_mem_region_t reg);
194 void mc_region_restore_sparse(mc_mem_region_t reg, mc_mem_region_t ref_reg);
195 void mc_softdirty_reset();
197 static inline __attribute__((always_inline))
198 bool mc_snapshot_region_linear(mc_mem_region_t region) {
199 return !region || !region->data;
202 void* mc_snapshot_read_fragmented(void* addr, mc_mem_region_t region, void* target, size_t size);
204 void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, int process_index, void* target, size_t size);
205 int mc_snapshot_region_memcmp(
206 void* addr1, mc_mem_region_t region1,
207 void* addr2, mc_mem_region_t region2, size_t size);
208 int mc_snapshot_memcmp(
209 void* addr1, mc_snapshot_t snapshot1,
210 void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size);
212 static void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot, int process_index);
214 /** @brief State of the model-checker (global variables for the model checker)
216 * Each part of the state of the model chercker represented as a global
217 * variable prevents some sharing between snapshots and must be ignored.
218 * By moving as much state as possible in this structure allocated
219 * on the model-chercker heap, we avoid those issues.
221 typedef struct s_mc_model_checker {
222 // This is the parent snapshot of the current state:
223 mc_snapshot_t parent_snapshot;
224 mc_pages_store_t pages;
228 } s_mc_model_checker_t, *mc_model_checker_t;
230 mc_model_checker_t MC_model_checker_new(void);
231 void MC_model_checker_delete(mc_model_checker_t mc);
232 extern mc_model_checker_t mc_model_checker;
234 extern xbt_dynar_t mc_checkpoint_ignore;
236 /********************************* MC Global **********************************/
238 extern double *mc_time;
239 extern FILE *dot_output;
240 extern const char* colors[13];
241 extern xbt_parmap_t parmap;
243 extern int user_max_depth_reached;
245 int MC_deadlock_check(void);
246 void MC_replay(xbt_fifo_t stack, int start);
247 void MC_replay_liveness(xbt_fifo_t stack, int all_stack);
248 void MC_show_deadlock(smx_simcall_t req);
249 void MC_show_stack_safety(xbt_fifo_t stack);
250 void MC_dump_stack_safety(xbt_fifo_t stack);
252 /** Stack (of `mc_state_t`) representing the current position of the
253 * the MC in the exploration graph
255 * It is managed by its head (`xbt_fifo_shift` and `xbt_fifo_unshift`).
257 extern xbt_fifo_t mc_stack;
259 int get_search_interval(xbt_dynar_t list, void *ref, int *min, int *max);
261 /********************************* Requests ***********************************/
263 int MC_request_depend(smx_simcall_t req1, smx_simcall_t req2);
264 char* MC_request_to_string(smx_simcall_t req, int value);
265 unsigned int MC_request_testany_fail(smx_simcall_t req);
266 /*int MC_waitany_is_enabled_by_comm(smx_req_t req, unsigned int comm);*/
267 int MC_request_is_visible(smx_simcall_t req);
269 /** Can this requests can be executed.
271 * Most requests are always enabled but WAIT and WAITANY
272 * are not always enabled: a WAIT where the communication does not
273 * have both a source and a destination yet is not enabled
274 * (unless timeout is enabled in the wait and enabeld in SimGridMC).
276 int MC_request_is_enabled(smx_simcall_t req);
277 int MC_request_is_enabled_by_idx(smx_simcall_t req, unsigned int idx);
279 /** Is the process ready to execute its simcall?
281 * This is true if the request associated with the process is ready.
283 int MC_process_is_enabled(smx_process_t process);
285 char *MC_request_get_dot_output(smx_simcall_t req, int value);
288 /******************************** States **************************************/
290 extern mc_global_t initial_global_state;
292 /* Possible exploration status of a process in a state */
294 MC_NOT_INTERLEAVE=0, /* Do not interleave (do not execute) */
295 MC_INTERLEAVE, /* Interleave the process (one or more request) */
296 MC_MORE_INTERLEAVE, /* Interleave twice the process (for mc_random simcall) */
297 MC_DONE /* Already interleaved */
298 } e_mc_process_state_t;
300 /* On every state, each process has an entry of the following type */
301 typedef struct mc_procstate{
302 e_mc_process_state_t state; /* Exploration control information */
303 unsigned int interleave_count; /* Number of times that the process was
305 } s_mc_procstate_t, *mc_procstate_t;
307 /* An exploration state.
309 * The `executed_state` is sometimes transformed into another `internal_req`.
310 * For example WAITANY is transformes into a WAIT and TESTANY into TEST.
311 * See `MC_state_set_executed_request()`.
313 typedef struct mc_state {
314 unsigned long max_pid; /* Maximum pid at state's creation time */
315 mc_procstate_t proc_status; /* State's exploration status by process */
316 s_smx_synchro_t internal_comm; /* To be referenced by the internal_req */
317 s_smx_simcall_t internal_req; /* Internal translation of request */
318 s_smx_simcall_t executed_req; /* The executed request of the state */
319 int req_num; /* The request number (in the case of a
320 multi-request like waitany ) */
321 mc_snapshot_t system_state; /* Snapshot of system state */
323 } s_mc_state_t, *mc_state_t;
325 mc_state_t MC_state_new(void);
326 void MC_state_delete(mc_state_t state);
327 void MC_state_interleave_process(mc_state_t state, smx_process_t process);
328 unsigned int MC_state_interleave_size(mc_state_t state);
329 int MC_state_process_is_done(mc_state_t state, smx_process_t process);
330 void MC_state_set_executed_request(mc_state_t state, smx_simcall_t req, int value);
331 smx_simcall_t MC_state_get_executed_request(mc_state_t state, int *value);
332 smx_simcall_t MC_state_get_internal_request(mc_state_t state);
333 smx_simcall_t MC_state_get_request(mc_state_t state, int *value);
334 void MC_state_remove_interleave_process(mc_state_t state, smx_process_t process);
337 /****************************** Statistics ************************************/
339 typedef struct mc_stats {
340 unsigned long state_size;
341 unsigned long visited_states;
342 unsigned long visited_pairs;
343 unsigned long expanded_states;
344 unsigned long expanded_pairs;
345 unsigned long executed_transitions;
346 } s_mc_stats_t, *mc_stats_t;
348 extern mc_stats_t mc_stats;
350 void MC_print_statistics(mc_stats_t);
353 /********************************** MEMORY ******************************/
354 /* The possible memory modes for the modelchecker are standard and raw. */
355 /* Normally the system should operate in std, for switching to raw mode */
356 /* you must wrap the code between MC_SET_RAW_MODE and MC_UNSET_RAW_MODE */
358 extern xbt_mheap_t std_heap;
359 extern xbt_mheap_t mc_heap;
362 /* FIXME: Horrible hack! because the mmalloc library doesn't provide yet of */
363 /* an API to query about the status of a heap, we simply call mmstats and */
364 /* because I now how does structure looks like, then I redefine it here */
366 /* struct mstats { */
367 /* size_t bytes_total; /\* Total size of the heap. *\/ */
368 /* size_t chunks_used; /\* Chunks allocated by the user. *\/ */
369 /* size_t bytes_used; /\* Byte total of user-allocated chunks. *\/ */
370 /* size_t chunks_free; /\* Chunks in the free list. *\/ */
371 /* size_t bytes_free; /\* Byte total of chunks in the free list. *\/ */
374 #define MC_SET_MC_HEAP mmalloc_set_current_heap(mc_heap)
375 #define MC_SET_STD_HEAP mmalloc_set_current_heap(std_heap)
378 /******************************* MEMORY MAPPINGS ***************************/
379 /* These functions and data structures implements a binary interface for */
380 /* the proc maps ascii interface */
382 /* Each field is defined as documented in proc's manual page */
383 typedef struct s_map_region {
385 void *start_addr; /* Start address of the map */
386 void *end_addr; /* End address of the map */
387 int prot; /* Memory protection */
388 int flags; /* Additional memory flags */
389 void *offset; /* Offset in the file/whatever */
390 char dev_major; /* Major of the device */
391 char dev_minor; /* Minor of the device */
392 unsigned long inode; /* Inode in the device */
393 char *pathname; /* Path name of the mapped file */
397 typedef struct s_memory_map {
399 s_map_region_t *regions; /* Pointer to an array of regions */
400 int mapsize; /* Number of regions in the memory */
402 } s_memory_map_t, *memory_map_t;
405 void MC_init_memory_map_info(void);
406 memory_map_t MC_get_memory_map(void);
407 void MC_free_memory_map(memory_map_t map);
409 extern char *libsimgrid_path;
411 /********************************** Snapshot comparison **********************************/
413 typedef struct s_mc_comparison_times{
414 double nb_processes_comparison_time;
415 double bytes_used_comparison_time;
416 double stacks_sizes_comparison_time;
417 double binary_global_variables_comparison_time;
418 double libsimgrid_global_variables_comparison_time;
419 double heap_comparison_time;
420 double stacks_comparison_time;
421 }s_mc_comparison_times_t, *mc_comparison_times_t;
423 extern __thread mc_comparison_times_t mc_comp_times;
424 extern __thread double mc_snapshot_comparison_time;
426 int snapshot_compare(void *state1, void *state2);
427 void print_comparison_times(void);
432 /********************************** Safety verification **************************************/
440 extern e_mc_reduce_t mc_reduce_kind;
441 extern xbt_dict_t first_enabled_state;
443 void MC_pre_modelcheck_safety(void);
444 void MC_modelcheck_safety(void);
446 typedef struct s_mc_visited_state{
447 mc_snapshot_t system_state;
448 size_t heap_bytes_used;
451 int other_num; // dot_output for
452 }s_mc_visited_state_t, *mc_visited_state_t;
454 extern xbt_dynar_t visited_states;
455 mc_visited_state_t is_visited_state(void);
456 void visited_state_free(mc_visited_state_t state);
457 void visited_state_free_voidp(void *s);
459 /********************************** Liveness verification **************************************/
461 extern xbt_automaton_t _mc_property_automaton;
463 typedef struct s_mc_pair{
466 mc_state_t graph_state; /* System state included */
467 xbt_automaton_state_t automaton_state;
468 xbt_dynar_t atomic_propositions;
470 }s_mc_pair_t, *mc_pair_t;
472 typedef struct s_mc_visited_pair{
474 int other_num; /* Dot output for */
476 mc_state_t graph_state; /* System state included */
477 xbt_automaton_state_t automaton_state;
478 xbt_dynar_t atomic_propositions;
479 size_t heap_bytes_used;
481 int acceptance_removed;
483 }s_mc_visited_pair_t, *mc_visited_pair_t;
485 mc_pair_t MC_pair_new(void);
486 void MC_pair_delete(mc_pair_t);
487 void mc_pair_free_voidp(void *p);
488 mc_visited_pair_t MC_visited_pair_new(int pair_num, xbt_automaton_state_t automaton_state, xbt_dynar_t atomic_propositions);
489 void MC_visited_pair_delete(mc_visited_pair_t p);
491 void MC_pre_modelcheck_liveness(void);
492 void MC_modelcheck_liveness(void);
493 void MC_show_stack_liveness(xbt_fifo_t stack);
494 void MC_dump_stack_liveness(xbt_fifo_t stack);
496 extern xbt_dynar_t visited_pairs;
497 int is_visited_pair(mc_visited_pair_t pair, int pair_num, xbt_automaton_state_t automaton_state, xbt_dynar_t atomic_propositions);
500 /********************************** Variables with DWARF **********************************/
502 #define MC_OBJECT_INFO_EXECUTABLE 1
504 struct s_mc_object_info {
507 char *start_exec, *end_exec; // Executable segment
508 char *start_rw, *end_rw; // Read-write segment
509 char *start_ro, *end_ro; // read-only segment
510 xbt_dict_t subprograms; // xbt_dict_t<origin as hexadecimal string, dw_frame_t>
511 xbt_dynar_t global_variables; // xbt_dynar_t<dw_variable_t>
512 xbt_dict_t types; // xbt_dict_t<origin as hexadecimal string, dw_type_t>
513 xbt_dict_t full_types_by_name; // xbt_dict_t<name, dw_type_t> (full defined type only)
515 // Here we sort the minimal information for an efficient (and cache-efficient)
516 // lookup of a function given an instruction pointer.
517 // The entries are sorted by low_pc and a binary search can be used to look them up.
518 xbt_dynar_t functions_index;
521 mc_object_info_t MC_new_object_info(void);
522 mc_object_info_t MC_find_object_info(memory_map_t maps, char* name, int executable);
523 void MC_free_object_info(mc_object_info_t* p);
525 void MC_dwarf_get_variables(mc_object_info_t info);
526 void MC_dwarf_get_variables_libdw(mc_object_info_t info);
527 const char* MC_dwarf_attrname(int attr);
528 const char* MC_dwarf_tagname(int tag);
530 dw_frame_t MC_find_function_by_ip(void* ip);
531 mc_object_info_t MC_ip_find_object_info(void* ip);
533 extern mc_object_info_t mc_libsimgrid_info;
534 extern mc_object_info_t mc_binary_info;
535 extern mc_object_info_t mc_object_infos[2];
536 extern size_t mc_object_infos_size;
538 void MC_find_object_address(memory_map_t maps, mc_object_info_t result);
539 void MC_post_process_object_info(mc_object_info_t info);
543 /** \brief a DWARF expression with optional validity contraints */
544 typedef struct s_mc_expression {
547 // Optional validity:
548 void* lowpc, *highpc;
549 } s_mc_expression_t, *mc_expression_t;
551 /** A location list (list of location expressions) */
552 typedef struct s_mc_location_list {
554 mc_expression_t locations;
555 } s_mc_location_list_t, *mc_location_list_t;
557 /** A location is either a location in memory of a register location
561 * * mc_dwarf_resolve_locations or mc_dwarf_resolve_location is used
562 * to find the location of a given location expression or location list;
564 * * mc_get_location_type MUST be used to find the location type;
566 * * for MC_LOCATION_TYPE_ADDRESS, memory_address is the resulting address
568 * * for MC_LOCATION_TYPE_REGISTER, unw_get_reg(l.cursor, l.register_id, value)
569 * and unw_get_reg(l.cursor, l.register_id, value) can be used to read/write
573 typedef struct s_mc_location {
574 void* memory_location;
575 unw_cursor_t* cursor;
577 } s_mc_location_t, *mc_location_t;
579 /** Type of a given location
581 * Use `mc_get_location_type(location)` to find the type.
583 typedef enum mc_location_type {
584 MC_LOCATION_TYPE_ADDRESS,
585 MC_LOCATION_TYPE_REGISTER
588 /** Find the type of a location */
589 static inline __attribute__ ((always_inline))
590 enum mc_location_type mc_get_location_type(mc_location_t location) {
591 if (location->cursor) {
592 return MC_LOCATION_TYPE_REGISTER;
594 return MC_LOCATION_TYPE_ADDRESS;
598 void mc_dwarf_resolve_location(mc_location_t location, mc_expression_t expression, mc_object_info_t object_info, unw_cursor_t* c, void* frame_pointer_address, mc_snapshot_t snapshot, int process_index);
599 void mc_dwarf_resolve_locations(mc_location_t location, mc_location_list_t locations, mc_object_info_t object_info, unw_cursor_t* c, void* frame_pointer_address, mc_snapshot_t snapshot, int process_index);
601 void mc_dwarf_expression_clear(mc_expression_t expression);
602 void mc_dwarf_expression_init(mc_expression_t expression, size_t len, Dwarf_Op* ops);
604 void mc_dwarf_location_list_clear(mc_location_list_t list);
606 void mc_dwarf_location_list_init_from_expression(mc_location_list_t target, size_t len, Dwarf_Op* ops);
607 void mc_dwarf_location_list_init(mc_location_list_t target, mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr);
609 // ***** Variables and functions
613 Dwarf_Off id; /* Offset in the section (in hexadecimal form) */
614 char *name; /* Name of the type */
615 int byte_size; /* Size in bytes */
616 int element_count; /* Number of elements for array type */
617 char *dw_type_id; /* DW_AT_type id */
618 xbt_dynar_t members; /* if DW_TAG_structure_type, DW_TAG_class_type, DW_TAG_union_type*/
621 // Location (for members) is either of:
622 struct s_mc_expression location;
625 dw_type_t subtype; // DW_AT_type
626 dw_type_t full_type; // The same (but more complete) type
629 void* mc_member_resolve(const void* base, dw_type_t type, dw_type_t member, mc_snapshot_t snapshot, int process_index);
631 typedef struct s_dw_variable{
632 Dwarf_Off dwarf_offset; /* Global offset of the field. */
639 s_mc_location_list_t locations;
643 mc_object_info_t object_info;
645 }s_dw_variable_t, *dw_variable_t;
652 s_mc_location_list_t frame_base;
653 xbt_dynar_t /* <dw_variable_t> */ variables; /* Cannot use dict, there may be several variables with the same name (in different lexical blocks)*/
654 unsigned long int id; /* DWARF offset of the subprogram */
655 xbt_dynar_t /* <dw_frame_t> */ scopes;
656 Dwarf_Off abstract_origin_id;
657 mc_object_info_t object_info;
660 struct s_mc_function_index_item {
661 void* low_pc, *high_pc;
665 void mc_frame_free(dw_frame_t freme);
667 void dw_type_free(dw_type_t t);
668 void dw_variable_free(dw_variable_t v);
669 void dw_variable_free_voidp(void *t);
671 void MC_dwarf_register_global_variable(mc_object_info_t info, dw_variable_t variable);
672 void MC_register_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable);
673 void MC_dwarf_register_non_global_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable);
674 void MC_dwarf_register_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable);
676 /** Find the DWARF offset for this ELF object
678 * An offset is applied to address found in DWARF:
681 * <li>for an executable obejct, addresses are virtual address
682 * (there is no offset) i.e. \f$\text{virtual address} = \{dwarf address}\f$;</li>
683 * <li>for a shared object, the addreses are offset from the begining
684 * of the shared object (the base address of the mapped shared
685 * object must be used as offset
686 * i.e. \f$\text{virtual address} = \text{shared object base address}
687 * + \text{dwarf address}\f$.</li>
690 void* MC_object_base_address(mc_object_info_t info);
692 /********************************** DWARF **********************************/
694 #define MC_EXPRESSION_STACK_SIZE 64
696 #define MC_EXPRESSION_OK 0
697 #define MC_EXPRESSION_E_UNSUPPORTED_OPERATION 1
698 #define MC_EXPRESSION_E_STACK_OVERFLOW 2
699 #define MC_EXPRESSION_E_STACK_UNDERFLOW 3
700 #define MC_EXPRESSION_E_MISSING_STACK_CONTEXT 4
701 #define MC_EXPRESSION_E_MISSING_FRAME_BASE 5
702 #define MC_EXPRESSION_E_NO_BASE_ADDRESS 6
704 typedef struct s_mc_expression_state {
705 uintptr_t stack[MC_EXPRESSION_STACK_SIZE];
708 unw_cursor_t* cursor;
710 mc_snapshot_t snapshot;
711 mc_object_info_t object_info;
713 } s_mc_expression_state_t, *mc_expression_state_t;
715 int mc_dwarf_execute_expression(size_t n, const Dwarf_Op* ops, mc_expression_state_t state);
717 void* mc_find_frame_base(dw_frame_t frame, mc_object_info_t object_info, unw_cursor_t* unw_cursor);
719 /********************************** Miscellaneous **********************************/
721 typedef struct s_local_variable{
722 dw_frame_t subprogram;
728 }s_local_variable_t, *local_variable_t;
730 /********************************* Communications pattern ***************************/
732 typedef struct s_mc_comm_pattern{
735 e_smx_comm_type_t type;
736 unsigned long src_proc;
737 unsigned long dst_proc;
738 const char *src_host;
739 const char *dst_host;
743 }s_mc_comm_pattern_t, *mc_comm_pattern_t;
745 extern xbt_dynar_t initial_communications_pattern;
746 extern xbt_dynar_t communications_pattern;
747 extern xbt_dynar_t incomplete_communications_pattern;
749 // Can we use the SIMIX syscall for this?
750 typedef enum mc_call_type {
755 MC_CALL_TYPE_WAITANY,
758 static inline mc_call_type mc_get_call_type(smx_simcall_t req) {
760 case SIMCALL_COMM_ISEND:
761 return MC_CALL_TYPE_SEND;
762 case SIMCALL_COMM_IRECV:
763 return MC_CALL_TYPE_RECV;
764 case SIMCALL_COMM_WAIT:
765 return MC_CALL_TYPE_WAIT;
766 case SIMCALL_COMM_WAITANY:
767 return MC_CALL_TYPE_WAITANY;
769 return MC_CALL_TYPE_NONE;
773 void get_comm_pattern(xbt_dynar_t communications_pattern, smx_simcall_t request, mc_call_type call_type);
774 void mc_update_comm_pattern(mc_call_type call_type, smx_simcall_t request, int value, xbt_dynar_t current_pattern);
775 void complete_comm_pattern(xbt_dynar_t list, smx_synchro_t comm);
776 void MC_pre_modelcheck_comm_determinism(void);
777 void MC_modelcheck_comm_determinism(void);
779 /* *********** Sets *********** */
781 typedef struct s_mc_address_set *mc_address_set_t;
783 mc_address_set_t mc_address_set_new();
784 void mc_address_set_free(mc_address_set_t* p);
785 void mc_address_add(mc_address_set_t p, const void* value);
786 bool mc_address_test(mc_address_set_t p, const void* value);
788 /* *********** Hash *********** */
790 /** \brief Hash the current state
791 * \param num_state number of states
792 * \param stacks stacks (mc_snapshot_stak_t) used fot the stack unwinding informations
793 * \result resulting hash
795 uint64_t mc_hash_processes_state(int num_state, xbt_dynar_t stacks);
797 /* *********** Snapshot *********** */
799 static inline __attribute__((always_inline))
800 void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region)
802 size_t pageno = mc_page_number(region->start_addr, (void*) addr);
803 size_t snapshot_pageno = region->page_numbers[pageno];
804 const void* snapshot_page = mc_page_store_get_page(mc_model_checker->pages, snapshot_pageno);
805 return (char*) snapshot_page + mc_page_offset((void*) addr);
808 /** \brief Translate a pointer from process address space to snapshot address space
810 * The address space contains snapshot of the main/application memory:
811 * this function finds the address in a given snaphot for a given
812 * real/application address.
814 * For read only memory regions and other regions which are not int the
815 * snapshot, the address is not changed.
817 * \param addr Application address
818 * \param snapshot The snapshot of interest (if NULL no translation is done)
819 * \return Translated address in the snapshot address space
821 static inline __attribute__((always_inline))
822 void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot, int process_index)
825 // If not in a process state/clone:
827 return (uintptr_t *) addr;
830 mc_mem_region_t region = mc_get_snapshot_region((void*) addr, snapshot, process_index);
832 xbt_assert(mc_region_contain(region, (void*) addr), "Trying to read out of the region boundary.");
835 return (void *) addr;
839 else if (region->data) {
840 uintptr_t offset = addr - (uintptr_t) region->start_addr;
841 return (void *) ((uintptr_t) region->data + offset);
844 // Per-page snapshot:
845 else if (region->page_numbers) {
846 return mc_translate_address_region(addr, region);
850 xbt_die("No data for this memory region");
854 static inline __attribute__ ((always_inline))
855 void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot) {
857 xbt_die("snapshot is NULL");
858 void** addr = &(std_heap->breakval);
859 return mc_snapshot_read_pointer(addr, snapshot, MC_ANY_PROCESS_INDEX);
862 static inline __attribute__ ((always_inline))
863 void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot, int process_index)
866 return *(void**) mc_snapshot_read(addr, snapshot, process_index, &res, sizeof(void*));
869 /** @brief Read memory from a snapshot region
871 * @param addr Process (non-snapshot) address of the data
872 * @param region Snapshot memory region where the data is located
873 * @param target Buffer to store the value
874 * @param size Size of the data to read in bytes
875 * @return Pointer where the data is located (target buffer of original location)
877 static inline __attribute__((always_inline))
878 void* mc_snapshot_read_region(void* addr, mc_mem_region_t region, void* target, size_t size)
883 uintptr_t offset = (char*) addr - (char*) region->start_addr;
885 xbt_assert(mc_region_contain(region, addr),
886 "Trying to read out of the region boundary.");
888 // Linear memory region:
890 return (char*) region->data + offset;
893 // Fragmented memory region:
894 else if (region->page_numbers) {
895 // Last byte of the region:
896 void* end = (char*) addr + size - 1;
897 if( mc_same_page(addr, end) ) {
898 // The memory is contained in a single page:
899 return mc_translate_address_region((uintptr_t) addr, region);
901 // The memory spans several pages:
902 return mc_snapshot_read_fragmented(addr, region, target, size);
907 xbt_die("No data available for this region");
911 static inline __attribute__ ((always_inline))
912 void* mc_snapshot_read_pointer_region(void* addr, mc_mem_region_t region)
915 return *(void**) mc_snapshot_read_region(addr, region, &res, sizeof(void*));
918 #define MC_LOG_REQUEST(log, req, value) \
919 if (XBT_LOG_ISENABLED(log, xbt_log_priority_debug)) { \
920 char* req_str = MC_request_to_string(req, value); \
921 XBT_DEBUG("Execute: %s", req_str); \
925 /** @brief Dump the stacks of the application processes
927 * This functions is currently not used but it is quite convenient
928 * to call from the debugger.
930 * Does not work when an application thread is running.
932 void MC_dump_stacks(FILE* file);