#include "funcnode.h"
+#include <fcntl.h>
FuncNode::FuncNode() :
- func_insts(),
+ predicate_tree_initialized(false),
+ predicate_tree_entry(new Predicate(NULL, true)),
+ func_inst_map(),
inst_list(),
- entry_insts()
+ entry_insts(),
+ thrd_read_map()
{}
-FuncInst * FuncNode::get_or_add_action(ModelAction *act)
+/* Check whether FuncInst with the same type, position, and location
+ * as act has been added to func_inst_map or not. If not, add it.
+ *
+ * Note: currently, actions with the same position are filtered out by process_action,
+ * so the collision list of FuncInst is not used. May remove it later.
+ */
+void FuncNode::add_inst(ModelAction *act)
{
ASSERT(act);
-
const char * position = act->get_position();
- /* Actions THREAD_CREATE, THREAD_START, THREAD_YIELD, THREAD_JOIN,
- * THREAD_FINISH, PTHREAD_CREATE, PTHREAD_JOIN,
- * ATOMIC_LOCK, ATOMIC_TRYLOCK, and ATOMIC_UNLOCK are not tagged with their
- * source line numbers
+ /* THREAD* actions, ATOMIC_LOCK, ATOMIC_TRYLOCK, and ATOMIC_UNLOCK
+ * actions are not tagged with their source line numbers
*/
- if (position == NULL) {
- return NULL;
- }
+ if (position == NULL)
+ return;
- if ( func_insts.contains(position) ) {
- FuncInst * inst = func_insts.get(position);
+ if ( func_inst_map.contains(position) ) {
+ FuncInst * inst = func_inst_map.get(position);
if (inst->get_type() != act->get_type() ) {
// model_print("action with a different type occurs at line number %s\n", position);
FuncInst * func_inst = inst->search_in_collision(act);
- if (func_inst != NULL) {
- // return the FuncInst found in the collision list
- return func_inst;
- }
+ if (func_inst != NULL)
+ return;
- func_inst = new FuncInst(act);
+ func_inst = new FuncInst(act, this);
inst->get_collisions()->push_back(func_inst);
- inst_list.push_back(func_inst); // delete?
- // model_print("collision added\n");
-
- return func_inst;
+ inst_list.push_back(func_inst); // delete?
}
- return inst;
+ return;
}
- FuncInst * func_inst = new FuncInst(act);
- func_insts.put(position, func_inst);
+ FuncInst * func_inst = new FuncInst(act, this);
+ func_inst_map.put(position, func_inst);
inst_list.push_back(func_inst);
- return func_inst;
}
+
+/* Get the FuncInst with the same type, position, and location
+ * as act
+ *
+ * @return FuncInst with the same type, position, and location as act */
+FuncInst * FuncNode::get_inst(ModelAction *act)
+{
+ ASSERT(act);
+ const char * position = act->get_position();
+
+ /* THREAD* actions, ATOMIC_LOCK, ATOMIC_TRYLOCK, and ATOMIC_UNLOCK
+ * actions are not tagged with their source line numbers
+ */
+ if (position == NULL)
+ return NULL;
+
+ FuncInst * inst = func_inst_map.get(position);
+ if (inst == NULL)
+ return NULL;
+
+ action_type inst_type = inst->get_type();
+ action_type act_type = act->get_type();
+
+ // else if branch: an RMWRCAS action is converted to a RMW or READ action
+ if (inst_type == act_type)
+ return inst;
+ else if (inst_type == ATOMIC_RMWRCAS &&
+ (act_type == ATOMIC_RMW || act_type == ATOMIC_READ))
+ return inst;
+
+ return NULL;
+}
+
+
+void FuncNode::add_entry_inst(FuncInst * inst)
+{
+ if (inst == NULL)
+ return;
+
+ mllnode<FuncInst *> * it;
+ for (it = entry_insts.begin(); it != NULL; it = it->getNext()) {
+ if (inst == it->getVal())
+ return;
+ }
+
+ entry_insts.push_back(inst);
+}
+
+/**
+ * @brief Convert ModelAdtion list to FuncInst list
+ * @param act_list A list of ModelActions
+ */
+void FuncNode::update_tree(action_list_t * act_list)
+{
+ if (act_list == NULL)
+ return;
+ else if (act_list->size() == 0)
+ return;
+
+ /* build inst_list from act_list for later processing */
+ func_inst_list_t inst_list;
+ action_list_t read_act_list;
+ HashTable<ModelAction *, FuncInst *, uintptr_t, 4> act_inst_map(128);
+
+ for (sllnode<ModelAction *> * it = act_list->begin(); it != NULL; it = it->getNext()) {
+ ModelAction * act = it->getVal();
+ FuncInst * func_inst = get_inst(act);
+
+ if (func_inst == NULL)
+ continue;
+
+ inst_list.push_back(func_inst);
+
+// model_print("position: %s ", act->get_position());
+// act->print();
+
+ if (func_inst->is_read()) {
+ read_act_list.push_back(act);
+ act_inst_map.put(act, func_inst);
+ }
+ }
+
+ update_inst_tree(&inst_list);
+ update_predicate_tree(&read_act_list, &act_inst_map);
+}
+
+/**
+ * @brief Link FuncInsts in inst_list - add one FuncInst to another's predecessors and successors
+ * @param inst_list A list of FuncInsts
+ */
+void FuncNode::update_inst_tree(func_inst_list_t * inst_list)
+{
+ if (inst_list == NULL)
+ return;
+ else if (inst_list->size() == 0)
+ return;
+
+ /* start linking */
+ sllnode<FuncInst *>* it = inst_list->begin();
+ sllnode<FuncInst *>* prev;
+
+ /* add the first instruction to the list of entry insts */
+ FuncInst * entry_inst = it->getVal();
+ add_entry_inst(entry_inst);
+
+ it = it->getNext();
+ while (it != NULL) {
+ prev = it->getPrev();
+
+ FuncInst * prev_inst = prev->getVal();
+ FuncInst * curr_inst = it->getVal();
+
+ prev_inst->add_succ(curr_inst);
+ curr_inst->add_pred(prev_inst);
+
+ it = it->getNext();
+ }
+}
+
+/* @param tid thread id
+ * Store the values read by atomic read actions into thrd_read_map */
+void FuncNode::store_read(ModelAction * act, uint32_t tid)
+{
+ ASSERT(act);
+
+ void * location = act->get_location();
+ uint64_t read_from_val = act->get_reads_from_value();
+
+ /* resize and initialize */
+ uint32_t old_size = thrd_read_map.size();
+ if (old_size <= tid) {
+ thrd_read_map.resize(tid + 1);
+ for (uint32_t i = old_size; i < tid + 1;i++)
+ thrd_read_map[i] = new read_map_t();
+ }
+
+ read_map_t * read_map = thrd_read_map[tid];
+ read_map->put(location, read_from_val);
+
+ /* Store the memory locations where atomic reads happen */
+ // read_locations.add(location);
+}
+
+uint64_t FuncNode::query_last_read(void * location, uint32_t tid)
+{
+ if (thrd_read_map.size() <= tid)
+ return 0xdeadbeef;
+
+ read_map_t * read_map = thrd_read_map[tid];
+
+ /* last read value not found */
+ if ( !read_map->contains(location) )
+ return 0xdeadbeef;
+
+ uint64_t read_val = read_map->get(location);
+ return read_val;
+}
+
+/* @param tid thread id
+ * Reset read map for a thread. This function shall only be called
+ * when a thread exits a function
+ */
+void FuncNode::clear_read_map(uint32_t tid)
+{
+ if (thrd_read_map.size() <= tid)
+ return;
+
+ thrd_read_map[tid]->reset();
+}
+
+void FuncNode::update_predicate_tree(action_list_t * act_list, HashTable<ModelAction *, FuncInst *, uintptr_t, 4> * act_inst_map)
+{
+ if (act_list == NULL || act_list->size() == 0)
+ return;
+/*
+ if (predicate_tree_initialized) {
+ return;
+ }
+ predicate_tree_initialized = true;
+*/
+ /* map a FuncInst to the parent of its predicate */
+ HashTable<FuncInst *, Predicate *, uintptr_t, 0> inst_pred_map(128);
+ HashTable<FuncInst *, uint64_t, uintptr_t, 4> read_val_map(128);
+ HashTable<void *, FuncInst *, uintptr_t, 4> loc_inst_map(128);
+
+ sllnode<ModelAction *> *it = act_list->begin();
+ Predicate * curr_pred = predicate_tree_entry;
+
+ while (it != NULL) {
+ ModelAction * curr_act = it->getVal();
+ FuncInst * curr_inst = act_inst_map->get(curr_act);
+ Predicate * old_pred = curr_pred;
+ read_val_map.put(curr_inst, curr_act->get_reads_from_value());
+
+ bool branch_found = follow_branch(&curr_pred, curr_inst, &read_val_map, &loc_inst_map);
+
+ // check back edges
+ if (!branch_found) {
+ Predicate * back_pred = curr_pred->get_backedge();
+ if (back_pred != NULL) {
+ curr_pred = back_pred;
+ continue;
+ }
+
+ if (inst_pred_map.contains(curr_inst)) {
+ back_pred = inst_pred_map.get(curr_inst);
+ curr_pred->set_backedge(back_pred);
+ curr_pred = back_pred;
+ continue;
+ }
+ }
+
+ if (!inst_pred_map.contains(curr_inst))
+ inst_pred_map.put(curr_inst, old_pred);
+
+ if (!branch_found) {
+ if ( loc_inst_map.contains(curr_inst->get_location()) ) {
+ Predicate * new_pred1 = new Predicate(curr_inst);
+ new_pred1->add_predicate(EQUALITY, curr_inst->get_location(), true);
+
+ Predicate * new_pred2 = new Predicate(curr_inst);
+ new_pred2->add_predicate(EQUALITY, curr_inst->get_location(), false);
+
+ curr_pred->add_child(new_pred1);
+ curr_pred->add_child(new_pred2);
+ //new_pred1->add_parent(curr_pred);
+ //new_pred2->add_parent(curr_pred);
+
+ FuncInst * last_inst = loc_inst_map.get(curr_inst->get_location());
+ uint64_t last_read = read_val_map.get(last_inst);
+ if ( last_read == read_val_map.get(curr_inst) )
+ curr_pred = new_pred1;
+ else
+ curr_pred = new_pred2;
+ } else {
+ Predicate * new_pred = new Predicate(curr_inst);
+ curr_pred->add_child(new_pred);
+ //new_pred->add_parent(curr_pred);
+
+ curr_pred = new_pred;
+ }
+ }
+
+ loc_inst_map.put(curr_inst->get_location(), curr_inst);
+ it = it->getNext();
+ }
+
+// model_print("function %s\n", func_name);
+// print_predicate_tree();
+}
+
+/* Given curr_pred and next_inst, find the branch following curr_pred that contains next_inst and the correct predicate
+ * @return true if branch found, false otherwise.
+ */
+bool FuncNode::follow_branch(Predicate ** curr_pred, FuncInst * next_inst,
+ HashTable<FuncInst *, uint64_t, uintptr_t, 4> * read_val_map, HashTable<void *, FuncInst *, uintptr_t, 4> * loc_inst_map)
+{
+ /* check if a branch with func_inst and corresponding predicate exists */
+ bool branch_found = false;
+ ModelVector<Predicate *> * branches = (*curr_pred)->get_children();
+ for (uint i = 0; i < branches->size(); i++) {
+ Predicate * branch = (*branches)[i];
+ if (branch->get_func_inst() != next_inst)
+ continue;
+
+ PredExprSet * pred_expressions = branch->get_pred_expressions();
+
+ /* no predicate, follow the only branch */
+ if (pred_expressions->getSize() == 0) {
+// model_print("no predicate exists: "); next_inst->print();
+ *curr_pred = branch;
+ branch_found = true;
+ break;
+ }
+
+ PredExprSetIter * pred_expr_it = pred_expressions->iterator();
+ while (pred_expr_it->hasNext()) {
+ pred_expr * pred_expression = pred_expr_it->next();
+ uint64_t last_read, next_read;
+ FuncInst * last_inst;
+ bool equality;
+
+ switch(pred_expression->token) {
+ case EQUALITY:
+ last_inst = loc_inst_map->get(next_inst->get_location());
+ last_read = read_val_map->get(last_inst);
+ next_read = read_val_map->get(next_inst);
+ equality = (last_read == next_read);
+
+ if (equality == pred_expression->value) {
+ *curr_pred = branch;
+// model_print("predicate: token: %d, location: %p, value: %d - ", pred_expression->token, pred_expression->location, pred_expression->value); next_inst->print();
+ branch_found = true;
+ }
+ break;
+ case NULLITY:
+ break;
+ default:
+ model_print("unkown predicate token\n");
+ break;
+ }
+ }
+
+ }
+
+ return branch_found;
+}
+
+void FuncNode::print_predicate_tree()
+{
+ model_print("digraph function_%s {\n", func_name);
+ predicate_tree_entry->print_pred_subtree();
+ model_print("}\n"); // end of graph
+}
+
+/* @param tid thread id
+ * Print the values read by the last read actions for each memory location
+ */
+/*
+void FuncNode::print_last_read(uint32_t tid)
+{
+ ASSERT(thrd_read_map.size() > tid);
+ read_map_t * read_map = thrd_read_map[tid];
+
+ mllnode<void *> * it;
+ for (it = read_locations.begin();it != NULL;it=it->getNext()) {
+ if ( !read_map->contains(it->getVal()) )
+ break;
+
+ uint64_t read_val = read_map->get(it->getVal());
+ model_print("last read of thread %d at %p: 0x%x\n", tid, it->getVal(), read_val);
+ }
+}
+*/
projects / c11tester.git / blobdiff