1 /* Copyright (c) 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 "mc_private.h"
11 #include "mc/datatypes.h"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_hash, mc, "Logging specific to mc_hash");
17 typedef uint64_t mc_hash_t;
18 #define MC_HASH_INIT ((uint64_t)5381)
20 // #define MC_HASH(hash, value) hash = (((hash << 5) + hash) + (uint64_t) value)
21 #define MC_HASH(hash, value) \
22 { hash = (((hash << 5) + hash) + (uint64_t) value);\
23 XBT_DEBUG("%s:%i: %"PRIx64" -> %"PRIx64, __FILE__, __LINE__, (uint64_t) value, hash); }
27 typedef struct s_mc_hashing_state {
28 // Set of pointers/addresses already processed (avoid loops):
29 mc_address_set_t handled_addresses;
32 void mc_hash_state_init(mc_hashing_state * state);
33 void mc_hash_state_destroy(mc_hashing_state * state);
35 void mc_hash_state_init(mc_hashing_state * state)
37 state->handled_addresses = mc_address_set_new();
40 void mc_hash_state_destroy(mc_hashing_state * state)
42 mc_address_set_free(&state->handled_addresses);
45 // TODO, detect and avoid loops
47 static bool mc_ignored(const void *address, size_t size)
49 mc_heap_ignore_region_t region;
50 unsigned int cursor = 0;
51 const void *end = (char *) address + size;
52 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, region) {
53 void *istart = region->address;
54 void *iend = (char *) region->address + region->size;
56 if (address >= istart && address < iend && end >= istart && end < iend)
63 static void mc_hash_binary(mc_hash_t * hash, const void *s, size_t len)
65 const char *p = (const void *) s;
67 for (i = 0; i != len; ++i) {
73 /** \brief Compute a hash for a given value of a given type
75 * We try to be very conservative (do not hash too ambiguous things).
77 * \param address address of the variable
78 * \param type type of the variable
80 static void mc_hash_value(mc_hash_t * hash, mc_hashing_state * state,
81 mc_object_info_t info, const void *address,
84 mc_process_t process = &mc_model_checker->process;
89 // Not relevant, do nothing:
90 case DW_TAG_unspecified_type:
93 // Simple case, hash this has binary:
94 case DW_TAG_base_type:
95 case DW_TAG_enumeration_type:
97 if (mc_ignored(address, 1))
99 mc_hash_binary(hash, address, type->byte_size);
103 case DW_TAG_array_type:
105 if (mc_ignored(address, type->byte_size))
108 long element_count = type->element_count;
109 dw_type_t subtype = type->subtype;
110 if (subtype == NULL) {
111 XBT_DEBUG("Hash array without subtype");
115 for (i = 0; i != element_count; ++i) {
116 XBT_DEBUG("Hash array element %i", i);
117 void *subaddress = ((char *) address) + i * subtype->byte_size;
118 mc_hash_value(hash, state, info, subaddress, subtype);
125 case DW_TAG_volatile_type:
126 case DW_TAG_const_type:
127 case DW_TAG_restrict_type:
129 type = type->subtype;
136 case DW_TAG_structure_type:
137 case DW_TAG_class_type:
139 if (mc_ignored(address, type->byte_size))
142 unsigned int cursor = 0;
144 xbt_dynar_foreach(type->members, cursor, member) {
145 XBT_DEBUG("Hash struct member %s", member->name);
146 if (type->subtype == NULL)
148 void *member_variable = mc_member_resolve(address, type, member, NULL);
149 mc_hash_value(hash, state, info, member_variable, type->subtype);
154 // Pointer, we hash a single value but it might be an array.
155 case DW_TAG_pointer_type:
156 case DW_TAG_reference_type:
157 case DW_TAG_rvalue_reference_type:
159 if (mc_ignored(address, 1))
162 void *pointed = *(void **) address;
163 if (pointed == NULL) {
164 XBT_DEBUG("Hashed pinter is NULL");
168 if (mc_address_test(state->handled_addresses, pointed)) {
169 XBT_DEBUG("Hashed pointed data %p already hashed", pointed);
172 mc_address_add(state->handled_addresses, pointed);
174 // Anything outside the R/W segments and the heap is not hashed:
175 bool valid_pointer = (pointed >= (void *) binary_info->start_rw
176 && pointed <= (void *) binary_info->end_rw)
177 || (pointed >= (void *) libsimgrid_info->start_rw
178 && pointed <= (void *) libsimgrid_info->end_rw)
179 || (pointed >= process->heap_address
180 && pointed < (void *) ((const char *) process->heap_address + STD_HEAP_SIZE));
181 if (!valid_pointer) {
182 XBT_DEBUG("Hashed pointed data %p is in an ignored range", pointed);
186 if (type->subtype == NULL) {
187 XBT_DEBUG("Missing type for %p (type=%s)", pointed, type->dw_type_id);
192 type = type->subtype;
197 case DW_TAG_union_type:
198 case DW_TAG_subroutine_type:
204 static void mc_hash_object_globals(mc_hash_t * hash, mc_hashing_state * state,
205 mc_object_info_t info)
207 unsigned int cursor = 0;
208 dw_variable_t variable;
209 xbt_dynar_foreach(info->global_variables, cursor, variable) {
210 XBT_DEBUG("Hash global variable %s", variable->name);
212 if (variable->type_origin == NULL) {
217 dw_type_t type = variable->type;
223 const char *address = variable->address;
224 bool valid_pointer = (address >= binary_info->start_rw
225 && address <= binary_info->end_rw)
226 || (address >= libsimgrid_info->start_rw
227 && address <= libsimgrid_info->end_rw)
228 || (address >= (const char *) process->heap_address
229 && address < (const char *) process->heap_address + STD_HEAP_SIZE);
233 mc_hash_value(hash, state, info, variable->address, type);
237 static void mc_hash_stack_frame(mc_hash_t * hash,
238 mc_object_info_t info,
239 unw_cursor_t * unw_cursor, dw_frame_t frame,
240 char *frame_pointer, mc_hashing_state * state)
245 unsigned int cursor = 0;
246 dw_variable_t variable;
247 xbt_dynar_foreach(frame->variables, cursor, variable) {
249 if (variable->type_origin == NULL) {
250 XBT_DEBUG("Hash local variable %s without type", variable->name);
253 if (variable->locations.size == 0) {
254 XBT_DEBUG("Hash local variable %s without location", variable->name);
258 XBT_DEBUG("Hash local variable %s", variable->name);
260 void *variable_address =
261 (void *) mc_dwarf_resolve_locations(&variable->locations,
262 variable->object_info, unw_cursor,
263 frame_pointer, NULL);
265 dw_type_t type = variable->type;
267 XBT_DEBUG("Hash local variable %s without loctypeation", variable->name);
271 mc_hash_value(hash, state, info, variable_address, type);
274 // TODO, handle nested scopes
277 static void mc_hash_stack(mc_hash_t * hash, mc_snapshot_stack_t stack,
278 mc_hashing_state * state)
282 mc_stack_frame_t stack_frame;
284 xbt_dynar_foreach(stack->stack_frames, cursor, stack_frame) {
286 MC_HASH(*hash, stack_frame->ip);
288 mc_object_info_t info;
289 if (stack_frame->ip >= (unw_word_t) libsimgrid_info->start_exec
290 && stack_frame->ip < (unw_word_t) libsimgrid_info->end_exec)
291 info = libsimgrid_info;
292 else if (stack_frame->ip >= (unw_word_t) binary_info->start_exec
293 && stack_frame->ip < (unw_word_t) binary_info->end_exec)
298 mc_hash_stack_frame(hash, info, &(stack_frame->unw_cursor),
299 stack_frame->frame, (void *) stack_frame->frame_base,
305 static void mc_hash_stacks(mc_hash_t * hash, mc_hashing_state * state,
308 unsigned int cursor = 0;
309 mc_snapshot_stack_t current_stack;
311 MC_HASH(*hash, xbt_dynar_length(stacks_areas));
314 xbt_dynar_foreach(stacks, cursor, current_stack) {
315 XBT_DEBUG("Stack %i", i);
316 mc_hash_stack(hash, current_stack, state);
322 uint64_t mc_hash_processes_state(int num_state, xbt_dynar_t stacks)
324 XBT_DEBUG("START hash %i", num_state);
326 mc_hashing_state state;
327 mc_hash_state_init(&state);
329 mc_hash_t hash = MC_HASH_INIT;
331 MC_HASH(hash, xbt_swag_size(simix_global->process_list)); // process count
332 // mc_hash_object_globals(&hash, &state, binary_info);
333 // mc_hash_object_globals(&hash, &state, libsimgrid_info);
334 // mc_hash_stacks(&hash, &state, stacks);
336 mc_hash_state_destroy(&state);
338 XBT_DEBUG("END hash %i", num_state);