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. */
12 #include "mc_private.h"
13 #include "mc/datatypes.h"
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_hash, mc, "Logging specific to mc_hash");
21 typedef uint64_t mc_hash_t;
22 #define MC_HASH_INIT ((uint64_t)5381)
24 // #define MC_HASH(hash, value) hash = (((hash << 5) + hash) + (uint64_t) value)
25 #define MC_HASH(hash, value) \
26 { hash = (((hash << 5) + hash) + (uint64_t) value);\
27 XBT_DEBUG("%s:%i: %" PRIx64 " -> %" PRIx64, __FILE__, __LINE__, (uint64_t) value, hash); }
32 typedef struct s_mc_hashing_state {
33 // Set of pointers/addresses already processed (avoid loops):
34 mc_address_set_t handled_addresses;
37 void mc_hash_state_init(mc_hashing_state * state);
38 void mc_hash_state_destroy(mc_hashing_state * state);
40 void mc_hash_state_init(mc_hashing_state * state)
42 state->handled_addresses = mc_address_set_new();
45 void mc_hash_state_destroy(mc_hashing_state * state)
47 mc_address_set_free(&state->handled_addresses);
50 // TODO, detect and avoid loops
52 static bool mc_ignored(const void *address, size_t size)
54 mc_heap_ignore_region_t region;
55 unsigned int cursor = 0;
56 const void *end = (char *) address + size;
57 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, region) {
58 void *istart = region->address;
59 void *iend = (char *) region->address + region->size;
61 if (address >= istart && address < iend && end >= istart && end < iend)
68 static void mc_hash_binary(mc_hash_t * hash, const void *s, size_t len)
70 const char *p = (const char*) s;
71 for (size_t i = 0; i != len; ++i) {
76 /** \brief Compute a hash for a given value of a given type
78 * We try to be very conservative (do not hash too ambiguous things).
80 * \param address address of the variable
81 * \param type type of the variable
83 static void mc_hash_value(mc_hash_t * hash, mc_hashing_state * state,
84 mc_object_info_t info, const void *address,
87 mc_process_t process = &mc_model_checker->process();
92 // Not relevant, do nothing:
93 case DW_TAG_unspecified_type:
96 // Simple case, hash this has binary:
97 case DW_TAG_base_type:
98 case DW_TAG_enumeration_type:
100 if (mc_ignored(address, 1))
102 mc_hash_binary(hash, address, type->byte_size);
106 case DW_TAG_array_type:
108 if (mc_ignored(address, type->byte_size))
111 long element_count = type->element_count;
112 dw_type_t subtype = type->subtype;
113 if (subtype == NULL) {
114 XBT_DEBUG("Hash array without subtype");
118 for (i = 0; i != element_count; ++i) {
119 XBT_DEBUG("Hash array element %i", i);
120 void *subaddress = ((char *) address) + i * subtype->byte_size;
121 mc_hash_value(hash, state, info, subaddress, subtype);
128 case DW_TAG_volatile_type:
129 case DW_TAG_const_type:
130 case DW_TAG_restrict_type:
132 type = type->subtype;
139 case DW_TAG_structure_type:
140 case DW_TAG_class_type:
142 if (mc_ignored(address, type->byte_size))
145 unsigned int cursor = 0;
147 xbt_dynar_foreach(type->members, cursor, member) {
148 XBT_DEBUG("Hash struct member %s", member->name);
149 if (type->subtype == NULL)
151 void *member_variable = mc_member_resolve(address, type, member, NULL);
152 mc_hash_value(hash, state, info, member_variable, type->subtype);
157 // Pointer, we hash a single value but it might be an array.
158 case DW_TAG_pointer_type:
159 case DW_TAG_reference_type:
160 case DW_TAG_rvalue_reference_type:
162 if (mc_ignored(address, 1))
165 void *pointed = *(void **) address;
166 if (pointed == NULL) {
167 XBT_DEBUG("Hashed pinter is NULL");
171 if (mc_address_test(state->handled_addresses, pointed)) {
172 XBT_DEBUG("Hashed pointed data %p already hashed", pointed);
175 mc_address_add(state->handled_addresses, pointed);
177 // Anything outside the R/W segments and the heap is not hashed:
178 bool valid_pointer = (pointed >= (void *) binary_info->start_rw
179 && pointed <= (void *) binary_info->end_rw)
180 || (pointed >= (void *) libsimgrid_info->start_rw
181 && pointed <= (void *) libsimgrid_info->end_rw)
182 || (pointed >= process->heap_address
183 && pointed < (void *) ((const char *) process->heap_address + STD_HEAP_SIZE));
184 if (!valid_pointer) {
185 XBT_DEBUG("Hashed pointed data %p is in an ignored range", pointed);
189 if (type->subtype == NULL) {
190 XBT_DEBUG("Missing type for %p (type=%s)", pointed, type->dw_type_id);
195 type = type->subtype;
200 case DW_TAG_union_type:
201 case DW_TAG_subroutine_type:
207 static void mc_hash_object_globals(mc_hash_t * hash, mc_hashing_state * state,
208 mc_object_info_t info)
210 unsigned int cursor = 0;
211 dw_variable_t variable;
212 xbt_dynar_foreach(info->global_variables, cursor, variable) {
213 XBT_DEBUG("Hash global variable %s", variable->name);
215 if (variable->type_origin == NULL) {
220 dw_type_t type = variable->type;
226 const char *address = variable->address;
227 bool valid_pointer = (address >= binary_info->start_rw
228 && address <= binary_info->end_rw)
229 || (address >= libsimgrid_info->start_rw
230 && address <= libsimgrid_info->end_rw)
231 || (address >= (const char *) process->heap_address
232 && address < (const char *) process->heap_address + STD_HEAP_SIZE);
236 mc_hash_value(hash, state, info, variable->address, type);
240 static void mc_hash_stack_frame(mc_hash_t * hash,
241 mc_object_info_t info,
242 unw_cursor_t * unw_cursor, dw_frame_t frame,
243 char *frame_pointer, mc_hashing_state * state)
248 unsigned int cursor = 0;
249 dw_variable_t variable;
250 xbt_dynar_foreach(frame->variables, cursor, variable) {
252 if (variable->type_origin == NULL) {
253 XBT_DEBUG("Hash local variable %s without type", variable->name);
256 if (variable->locations.size == 0) {
257 XBT_DEBUG("Hash local variable %s without location", variable->name);
261 XBT_DEBUG("Hash local variable %s", variable->name);
263 void *variable_address =
264 (void *) mc_dwarf_resolve_locations(&variable->locations,
265 variable->object_info, unw_cursor,
266 frame_pointer, NULL);
268 dw_type_t type = variable->type;
270 XBT_DEBUG("Hash local variable %s without loctypeation", variable->name);
274 mc_hash_value(hash, state, info, variable_address, type);
277 // TODO, handle nested scopes
280 static void mc_hash_stack(mc_hash_t * hash, mc_snapshot_stack_t stack,
281 mc_hashing_state * state)
285 mc_stack_frame_t stack_frame;
287 xbt_dynar_foreach(stack->stack_frames, cursor, stack_frame) {
289 MC_HASH(*hash, stack_frame->ip);
291 mc_object_info_t info;
292 if (stack_frame->ip >= (unw_word_t) libsimgrid_info->start_exec
293 && stack_frame->ip < (unw_word_t) libsimgrid_info->end_exec)
294 info = libsimgrid_info;
295 else if (stack_frame->ip >= (unw_word_t) binary_info->start_exec
296 && stack_frame->ip < (unw_word_t) binary_info->end_exec)
301 mc_hash_stack_frame(hash, info, &(stack_frame->unw_cursor),
302 stack_frame->frame, (void *) stack_frame->frame_base,
308 static void mc_hash_stacks(mc_hash_t * hash, mc_hashing_state * state,
311 unsigned int cursor = 0;
312 mc_snapshot_stack_t current_stack;
314 MC_HASH(*hash, xbt_dynar_length(stacks_areas));
317 xbt_dynar_foreach(stacks, cursor, current_stack) {
318 XBT_DEBUG("Stack %i", i);
319 mc_hash_stack(hash, current_stack, state);
325 uint64_t mc_hash_processes_state(int num_state, xbt_dynar_t stacks)
327 XBT_DEBUG("START hash %i", num_state);
330 mc_hashing_state state;
331 mc_hash_state_init(&state);
334 mc_hash_t hash = MC_HASH_INIT;
336 MC_HASH(hash, xbt_swag_size(simix_global->process_list)); // process count
338 // mc_hash_object_globals(&hash, &state, binary_info);
339 // mc_hash_object_globals(&hash, &state, libsimgrid_info);
340 // mc_hash_stacks(&hash, &state, stacks);
341 mc_hash_state_destroy(&state);
344 XBT_DEBUG("END hash %i", num_state);