X-Git-Url: http://plrg.eecs.uci.edu/git/?p=model-checker.git;a=blobdiff_plain;f=nodestack.cc;h=00cc30f8d7efb22cf9e5b110d4628ac83db55e0f;hp=4cf89500fc1faba0f98714173fbd4eca557edefa;hb=9eee54de6cd97a5a58f3185de0c4635123d398b2;hpb=b4a228de75d93aad50a07b3b048f69bc57ba2dd8 diff --git a/nodestack.cc b/nodestack.cc index 4cf8950..00cc30f 100644 --- a/nodestack.cc +++ b/nodestack.cc @@ -1,10 +1,14 @@ +#define __STDC_FORMAT_MACROS +#include + #include #include "nodestack.h" #include "action.h" #include "common.h" #include "model.h" -#include "threads.h" +#include "threads-model.h" +#include "modeltypes.h" /** * @brief Node constructor @@ -20,8 +24,9 @@ * @param nthreads The number of threads which exist at this point in the * execution trace. */ -Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) - : action(act), +Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) : + read_from_status(READ_FROM_PAST), + action(act), parent(par), num_threads(nthreads), explored_children(num_threads), @@ -29,44 +34,53 @@ Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) fairness(num_threads), numBacktracks(0), enabled_array(NULL), - may_read_from(), - read_from_index(0), + read_from_past(), + read_from_past_idx(0), + read_from_promises(), + read_from_promise_idx(-1), future_values(), - future_index(-1) -{ - if (act) { - act->set_node(this); - int currtid=id_to_int(act->get_tid()); - int prevtid=(prevfairness != NULL)?id_to_int(prevfairness->action->get_tid()):0; - - if ( model->params.fairwindow != 0 ) { - for(int i=0;iget_num_threads())?&par->fairness[i]:NULL; - if (prevfi) { - *fi=*prevfi; - } - if (parent->enabled_array[i]==THREAD_ENABLED) { - fi->enabled_count++; - } - if (i==currtid) { - fi->turns++; - fi->priority = false; - } - //Do window processing - if (prevfairness != NULL) { - if (prevfairness -> parent->enabled_array[i] == THREAD_ENABLED) - fi->enabled_count--; - if (i==prevtid) { - fi->turns--; - } - //Need full window to start evaluating conditions - //If we meet the enabled count and have no turns, give us priority - if ((fi->enabled_count >= model->params.enabledcount) && - (fi->turns == 0)) - fi->priority = true; + future_index(-1), + resolve_promise(), + resolve_promise_idx(-1), + relseq_break_writes(), + relseq_break_index(0), + misc_index(0), + misc_max(0) +{ + ASSERT(act); + act->set_node(this); + int currtid = id_to_int(act->get_tid()); + int prevtid = prevfairness ? id_to_int(prevfairness->action->get_tid()) : 0; + + if (model->params.fairwindow != 0) { + for (int i = 0; i < num_threads; i++) { + ASSERT(i < ((int)fairness.size())); + struct fairness_info *fi = &fairness[i]; + struct fairness_info *prevfi = (parent && i < parent->get_num_threads()) ? &parent->fairness[i] : NULL; + if (prevfi) { + *fi = *prevfi; + } + if (parent && parent->is_enabled(int_to_id(i))) { + fi->enabled_count++; + } + if (i == currtid) { + fi->turns++; + fi->priority = false; + } + /* Do window processing */ + if (prevfairness != NULL) { + if (prevfairness->parent->is_enabled(int_to_id(i))) + fi->enabled_count--; + if (i == prevtid) { + fi->turns--; } + /* Need full window to start evaluating + * conditions + * If we meet the enabled count and have no + * turns, give us priority */ + if ((fi->enabled_count >= model->params.enabledcount) && + (fi->turns == 0)) + fi->priority = true; } } } @@ -75,66 +89,79 @@ Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) /** @brief Node desctructor */ Node::~Node() { - if (action) - delete action; + delete action; if (enabled_array) model_free(enabled_array); } /** Prints debugging info for the ModelAction associated with this Node */ -void Node::print() +void Node::print() const { - if (action) - action->print(); - else - printf("******** empty action ********\n"); -} + action->print(); + model_print(" backtrack: %s", backtrack_empty() ? "empty" : "non-empty "); + for (int i = 0; i < (int)backtrack.size(); i++) + if (backtrack[i] == true) + model_print("[%d]", i); + model_print("\n"); -/** @brief Prints info about may_read_from set */ -void Node::print_may_read_from() -{ - for (unsigned int i = 0; i < may_read_from.size(); i++) - may_read_from[i]->print(); + model_print(" read from past: %s", read_from_past_empty() ? "empty" : "non-empty "); + for (int i = read_from_past_idx + 1; i < (int)read_from_past.size(); i++) + model_print("[%d]", read_from_past[i]->get_seq_number()); + model_print("\n"); + + model_print(" read-from promises: %s", read_from_promise_empty() ? "empty" : "non-empty "); + for (int i = read_from_promise_idx + 1; i < (int)read_from_promises.size(); i++) + model_print("[%d]", read_from_promises[i]->get_seq_number()); + model_print("\n"); + + model_print(" future values: %s", future_value_empty() ? "empty" : "non-empty "); + for (int i = future_index + 1; i < (int)future_values.size(); i++) + model_print("[%#" PRIx64 "]", future_values[i].value); + model_print("\n"); + + model_print(" promises: %s\n", promise_empty() ? "empty" : "non-empty"); + model_print(" misc: %s\n", misc_empty() ? "empty" : "non-empty"); + model_print(" rel seq break: %s\n", relseq_break_empty() ? "empty" : "non-empty"); } +/*********************************** promise **********************************/ + /** * Sets a promise to explore meeting with the given node. * @param i is the promise index. */ -void Node::set_promise(unsigned int i) { - if (i >= promises.size()) - promises.resize(i + 1, PROMISE_IGNORE); - if (promises[i] == PROMISE_IGNORE) - promises[i] = PROMISE_UNFULFILLED; +void Node::set_promise(unsigned int i) +{ + if (i >= resolve_promise.size()) + resolve_promise.resize(i + 1, false); + resolve_promise[i] = true; } /** * Looks up whether a given promise should be satisfied by this node. * @param i The promise index. - * @return true if the promise should be satisfied by the given model action. + * @return true if the promise should be satisfied by the given ModelAction. */ -bool Node::get_promise(unsigned int i) { - return (i < promises.size()) && (promises[i] == PROMISE_FULFILLED); +bool Node::get_promise(unsigned int i) const +{ + return (i < resolve_promise.size()) && (int)i == resolve_promise_idx; } /** - * Increments to the next combination of promises. + * Increments to the next promise to resolve. * @return true if we have a valid combination. */ -bool Node::increment_promise() { +bool Node::increment_promise() +{ DBG(); - - for (unsigned int i = 0; i < promises.size(); i++) { - if (promises[i] == PROMISE_UNFULFILLED) { - promises[i] = PROMISE_FULFILLED; - while (i > 0) { - i--; - if (promises[i] == PROMISE_FULFILLED) - promises[i] = PROMISE_UNFULFILLED; - } + if (resolve_promise.empty()) + return false; + int prev_idx = resolve_promise_idx; + resolve_promise_idx++; + for ( ; resolve_promise_idx < (int)resolve_promise.size(); resolve_promise_idx++) + if (resolve_promise[resolve_promise_idx]) return true; - } - } + resolve_promise_idx = prev_idx; return false; } @@ -142,44 +169,41 @@ bool Node::increment_promise() { * Returns whether the promise set is empty. * @return true if we have explored all promise combinations. */ -bool Node::promise_empty() { - for (unsigned int i = 0; i < promises.size();i++) - if (promises[i] == PROMISE_UNFULFILLED) +bool Node::promise_empty() const +{ + for (int i = resolve_promise_idx + 1; i < (int)resolve_promise.size(); i++) + if (i >= 0 && resolve_promise[i]) return false; return true; } -/** - * Adds a value from a weakly ordered future write to backtrack to. - * @param value is the value to backtrack to. - */ -bool Node::add_future_value(uint64_t value, modelclock_t expiration) { - int suitableindex=-1; - for (unsigned int i = 0; i < future_values.size(); i++) { - if (future_values[i].value == value) { - if (future_values[i].expiration>=expiration) - return false; - if (future_index < ((int) i)) { - suitableindex=i; - } - } - } +/** @brief Clear any promise-resolution information for this Node */ +void Node::clear_promise_resolutions() +{ + resolve_promise.clear(); + resolve_promise_idx = -1; +} - if (suitableindex!=-1) { - future_values[suitableindex].expiration=expiration; - return true; - } - struct future_value newfv={value, expiration}; - future_values.push_back(newfv); - return true; +/******************************* end promise **********************************/ + +void Node::set_misc_max(int i) +{ + misc_max = i; } -/** - * Checks whether the future_values set for this node is empty. - * @return true if the future_values set is empty. - */ -bool Node::future_value_empty() { - return ((future_index + 1) >= ((int)future_values.size())); +int Node::get_misc() const +{ + return misc_index; +} + +bool Node::increment_misc() +{ + return (misc_index < misc_max) && ((++misc_index) < misc_max); +} + +bool Node::misc_empty() const +{ + return (misc_index + 1) >= misc_max; } /** @@ -189,7 +213,7 @@ bool Node::future_value_empty() { * @return true if this thread choice has been explored already, false * otherwise */ -bool Node::has_been_explored(thread_id_t tid) +bool Node::has_been_explored(thread_id_t tid) const { int id = id_to_int(tid); return explored_children[id]; @@ -199,32 +223,24 @@ bool Node::has_been_explored(thread_id_t tid) * Checks if the backtracking set is empty. * @return true if the backtracking set is empty */ -bool Node::backtrack_empty() +bool Node::backtrack_empty() const { return (numBacktracks == 0); } -/** - * Checks whether the readsfrom set for this node is empty. - * @return true if the readsfrom set is empty. - */ -bool Node::read_from_empty() { - return ((read_from_index+1) >= may_read_from.size()); -} - /** * Mark the appropriate backtracking information for exploring a thread choice. * @param act The ModelAction to explore */ -void Node::explore_child(ModelAction *act, enabled_type_t * is_enabled) +void Node::explore_child(ModelAction *act, enabled_type_t *is_enabled) { - if ( ! enabled_array ) - enabled_array=(enabled_type_t *)model_malloc(sizeof(enabled_type_t)*num_threads); + if (!enabled_array) + enabled_array = (enabled_type_t *)model_malloc(sizeof(enabled_type_t) * num_threads); if (is_enabled != NULL) - memcpy(enabled_array, is_enabled, sizeof(enabled_type_t)*num_threads); + memcpy(enabled_array, is_enabled, sizeof(enabled_type_t) * num_threads); else { - for(int i=0;iget_tid()); @@ -240,6 +256,7 @@ void Node::explore_child(ModelAction *act, enabled_type_t * is_enabled) bool Node::set_backtrack(thread_id_t id) { int i = id_to_int(id); + ASSERT(i < ((int)backtrack.size())); if (backtrack[i]) return false; backtrack[i] = true; @@ -262,89 +279,285 @@ thread_id_t Node::get_next_backtrack() return int_to_id(i); } -bool Node::is_enabled(Thread *t) +void Node::clear_backtracking() +{ + for (unsigned int i = 0; i < backtrack.size(); i++) + backtrack[i] = false; + for (unsigned int i = 0; i < explored_children.size(); i++) + explored_children[i] = false; + numBacktracks = 0; +} + +bool Node::is_enabled(Thread *t) const { - int thread_id=id_to_int(t->get_id()); - return thread_id < num_threads && (enabled_array[thread_id] == THREAD_ENABLED); + int thread_id = id_to_int(t->get_id()); + return thread_id < num_threads && (enabled_array[thread_id] != THREAD_DISABLED); } -bool Node::is_enabled(thread_id_t tid) +enabled_type_t Node::enabled_status(thread_id_t tid) const { - int thread_id=id_to_int(tid); - return thread_id < num_threads && (enabled_array[thread_id] == THREAD_ENABLED); + int thread_id = id_to_int(tid); + if (thread_id < num_threads) + return enabled_array[thread_id]; + else + return THREAD_DISABLED; } -bool Node::has_priority(thread_id_t tid) +bool Node::is_enabled(thread_id_t tid) const +{ + int thread_id = id_to_int(tid); + return thread_id < num_threads && (enabled_array[thread_id] != THREAD_DISABLED); +} + +bool Node::has_priority(thread_id_t tid) const { return fairness[id_to_int(tid)].priority; } +/*********************************** read from ********************************/ + /** - * Add an action to the may_read_from set. - * @param act is the action to add + * Get the current state of the may-read-from set iteration + * @return The read-from type we should currently be checking (past or future) */ -void Node::add_read_from(const ModelAction *act) +read_from_type_t Node::get_read_from_status() { - may_read_from.push_back(act); + if (read_from_status == READ_FROM_PAST && read_from_past.empty()) + increment_read_from(); + return read_from_status; } /** - * Gets the next 'future_value' value from this Node. Only valid for a node - * where this->action is a 'read'. - * @return The first element in future_values + * Iterate one step in the may-read-from iteration. This includes a step in + * reading from the either the past or the future. + * @return True if there is a new read-from to explore; false otherwise */ -uint64_t Node::get_future_value() { - ASSERT(future_index<((int)future_values.size())); - return future_values[future_index].value; +bool Node::increment_read_from() +{ + clear_promise_resolutions(); + if (increment_read_from_past()) { + read_from_status = READ_FROM_PAST; + return true; + } else if (increment_read_from_promise()) { + read_from_status = READ_FROM_PROMISE; + return true; + } else if (increment_future_value()) { + read_from_status = READ_FROM_FUTURE; + return true; + } + read_from_status = READ_FROM_NONE; + return false; } -modelclock_t Node::get_future_value_expiration() { - ASSERT(future_index<((int)future_values.size())); - return future_values[future_index].expiration; +/** + * @return True if there are any new read-froms to explore + */ +bool Node::read_from_empty() const +{ + return read_from_past_empty() && + read_from_promise_empty() && + future_value_empty(); +} + +/** + * Get the total size of the may-read-from set, including both past and future + * values + * @return The size of may-read-from + */ +unsigned int Node::read_from_size() const +{ + return read_from_past.size() + + read_from_promises.size() + + future_values.size(); } +/******************************* end read from ********************************/ + +/****************************** read from past ********************************/ -int Node::get_read_from_size() { - return may_read_from.size(); +/** @brief Prints info about read_from_past set */ +void Node::print_read_from_past() +{ + for (unsigned int i = 0; i < read_from_past.size(); i++) + read_from_past[i]->print(); } -const ModelAction * Node::get_read_from_at(int i) { - return may_read_from[i]; +/** + * Add an action to the read_from_past set. + * @param act is the action to add + */ +void Node::add_read_from_past(const ModelAction *act) +{ + read_from_past.push_back(act); } /** - * Gets the next 'may_read_from' action from this Node. Only valid for a node + * Gets the next 'read_from_past' action from this Node. Only valid for a node * where this->action is a 'read'. - * @return The first element in may_read_from + * @return The first element in read_from_past */ -const ModelAction * Node::get_read_from() { - if (read_from_index < may_read_from.size()) - return may_read_from[read_from_index]; +const ModelAction * Node::get_read_from_past() const +{ + if (read_from_past_idx < read_from_past.size()) + return read_from_past[read_from_past_idx]; else return NULL; } +const ModelAction * Node::get_read_from_past(int i) const +{ + return read_from_past[i]; +} + +int Node::get_read_from_past_size() const +{ + return read_from_past.size(); +} + +/** + * Checks whether the readsfrom set for this node is empty. + * @return true if the readsfrom set is empty. + */ +bool Node::read_from_past_empty() const +{ + return ((read_from_past_idx + 1) >= read_from_past.size()); +} + /** * Increments the index into the readsfrom set to explore the next item. * @return Returns false if we have explored all items. */ -bool Node::increment_read_from() { +bool Node::increment_read_from_past() +{ + DBG(); + if (read_from_past_idx < read_from_past.size()) { + read_from_past_idx++; + return read_from_past_idx < read_from_past.size(); + } + return false; +} + +/************************** end read from past ********************************/ + +/***************************** read_from_promises *****************************/ + +/** + * Add an action to the read_from_promises set. + * @param reader The read which generated the Promise; we use the ModelAction + * instead of the Promise because the Promise does not last across executions + */ +void Node::add_read_from_promise(const ModelAction *reader) +{ + read_from_promises.push_back(reader); +} + +/** + * Gets the next 'read-from-promise' from this Node. Only valid for a node + * where this->action is a 'read'. + * @return The current element in read_from_promises + */ +Promise * Node::get_read_from_promise() const +{ + if (read_from_promise_idx < 0 || read_from_promise_idx >= ((int)read_from_promises.size())) + return NULL; + return read_from_promises[read_from_promise_idx]->get_reads_from_promise(); +} + +/** + * Checks whether the read_from_promises set for this node is empty. + * @return true if the read_from_promises set is empty. + */ +bool Node::read_from_promise_empty() const +{ + return ((read_from_promise_idx + 1) >= ((int)read_from_promises.size())); +} + +/** + * Increments the index into the read_from_promises set to explore the next item. + * @return Returns false if we have explored all promises. + */ +bool Node::increment_read_from_promise() +{ DBG(); - promises.clear(); - if (read_from_index < may_read_from.size()) { - read_from_index++; - return read_from_index < may_read_from.size(); + if (read_from_promise_idx < ((int)read_from_promises.size())) { + read_from_promise_idx++; + return (read_from_promise_idx < ((int)read_from_promises.size())); } return false; } +/************************* end read_from_promises *****************************/ + +/****************************** future values *********************************/ + +/** + * Adds a value from a weakly ordered future write to backtrack to. This + * operation may "fail" if the future value has already been run (within some + * sloppiness window of this expiration), or if the futurevalues set has + * reached its maximum. + * @see model_params.maxfuturevalues + * + * @param value is the value to backtrack to. + * @return True if the future value was successully added; false otherwise + */ +bool Node::add_future_value(struct future_value fv) +{ + uint64_t value = fv.value; + modelclock_t expiration = fv.expiration; + thread_id_t tid = fv.tid; + int idx = -1; /* Highest index where value is found */ + for (unsigned int i = 0; i < future_values.size(); i++) { + if (future_values[i].value == value && future_values[i].tid == tid) { + if (expiration <= future_values[i].expiration) + return false; + idx = i; + } + } + if (idx > future_index) { + /* Future value hasn't been explored; update expiration */ + future_values[idx].expiration = expiration; + return true; + } else if (idx >= 0 && expiration <= future_values[idx].expiration + model->params.expireslop) { + /* Future value has been explored and is within the "sloppy" window */ + return false; + } + + /* Limit the size of the future-values set */ + if (model->params.maxfuturevalues > 0 && + (int)future_values.size() >= model->params.maxfuturevalues) + return false; + + future_values.push_back(fv); + return true; +} + +/** + * Gets the next 'future_value' from this Node. Only valid for a node where + * this->action is a 'read'. + * @return The first element in future_values + */ +struct future_value Node::get_future_value() const +{ + ASSERT(future_index >= 0 && future_index < ((int)future_values.size())); + return future_values[future_index]; +} + +/** + * Checks whether the future_values set for this node is empty. + * @return true if the future_values set is empty. + */ +bool Node::future_value_empty() const +{ + return ((future_index + 1) >= ((int)future_values.size())); +} + /** * Increments the index into the future_values set to explore the next item. * @return Returns false if we have explored all values. */ -bool Node::increment_future_value() { +bool Node::increment_future_value() +{ DBG(); - promises.clear(); if (future_index < ((int)future_values.size())) { future_index++; return (future_index < ((int)future_values.size())); @@ -352,9 +565,64 @@ bool Node::increment_future_value() { return false; } +/************************** end future values *********************************/ + +/** + * Add a write ModelAction to the set of writes that may break the release + * sequence. This is used during replay exploration of pending release + * sequences. This Node must correspond to a release sequence fixup action. + * + * @param write The write that may break the release sequence. NULL means we + * allow the release sequence to synchronize. + */ +void Node::add_relseq_break(const ModelAction *write) +{ + relseq_break_writes.push_back(write); +} + +/** + * Get the write that may break the current pending release sequence, + * according to the replay / divergence pattern. + * + * @return A write that may break the release sequence. If NULL, that means + * the release sequence should not be broken. + */ +const ModelAction * Node::get_relseq_break() const +{ + if (relseq_break_index < (int)relseq_break_writes.size()) + return relseq_break_writes[relseq_break_index]; + else + return NULL; +} + +/** + * Increments the index into the relseq_break_writes set to explore the next + * item. + * @return Returns false if we have explored all values. + */ +bool Node::increment_relseq_break() +{ + DBG(); + if (relseq_break_index < ((int)relseq_break_writes.size())) { + relseq_break_index++; + return (relseq_break_index < ((int)relseq_break_writes.size())); + } + return false; +} + +/** + * @return True if all writes that may break the release sequence have been + * explored + */ +bool Node::relseq_break_empty() const +{ + return ((relseq_break_index + 1) >= ((int)relseq_break_writes.size())); +} + void Node::explore(thread_id_t tid) { int i = id_to_int(tid); + ASSERT(i < ((int)backtrack.size())); if (backtrack[i]) { backtrack[i] = false; numBacktracks--; @@ -363,8 +631,8 @@ void Node::explore(thread_id_t tid) } NodeStack::NodeStack() : - node_list(1, new Node()), - iter(0), + node_list(), + head_idx(-1), total_nodes(0) { total_nodes++; @@ -376,41 +644,44 @@ NodeStack::~NodeStack() delete node_list[i]; } -void NodeStack::print() +void NodeStack::print() const { - printf("............................................\n"); - printf("NodeStack printing node_list:\n"); + model_print("............................................\n"); + model_print("NodeStack printing node_list:\n"); for (unsigned int it = 0; it < node_list.size(); it++) { - if (it == this->iter) - printf("vvv following action is the current iterator vvv\n"); + if ((int)it == this->head_idx) + model_print("vvv following action is the current iterator vvv\n"); node_list[it]->print(); } - printf("............................................\n"); + model_print("............................................\n"); } /** Note: The is_enabled set contains what actions were enabled when * act was chosen. */ - -ModelAction * NodeStack::explore_action(ModelAction *act, enabled_type_t * is_enabled) +ModelAction * NodeStack::explore_action(ModelAction *act, enabled_type_t *is_enabled) { DBG(); - ASSERT(!node_list.empty()); - - if ((iter+1) < node_list.size()) { - iter++; - return node_list[iter]->get_action(); + if ((head_idx + 1) < (int)node_list.size()) { + head_idx++; + return node_list[head_idx]->get_action(); } /* Record action */ - get_head()->explore_child(act, is_enabled); + Node *head = get_head(); Node *prevfairness = NULL; - if ( model->params.fairwindow != 0 && iter > model->params.fairwindow ) { - prevfairness = node_list[iter-model->params.fairwindow]; + if (head) { + head->explore_child(act, is_enabled); + if (model->params.fairwindow != 0 && head_idx > (int)model->params.fairwindow) + prevfairness = node_list[head_idx - model->params.fairwindow]; } - node_list.push_back(new Node(act, get_head(), model->get_num_threads(), prevfairness)); + + int next_threads = model->get_num_threads(); + if (act->get_type() == THREAD_CREATE) + next_threads++; + node_list.push_back(new Node(act, head, next_threads, prevfairness)); total_nodes++; - iter++; + head_idx++; return NULL; } @@ -425,26 +696,27 @@ ModelAction * NodeStack::explore_action(ModelAction *act, enabled_type_t * is_en void NodeStack::pop_restofstack(int numAhead) { /* Diverging from previous execution; clear out remainder of list */ - unsigned int it=iter+numAhead; - for(unsigned int i=it;iclear_backtracking(); } -Node * NodeStack::get_head() +Node * NodeStack::get_head() const { - if (node_list.empty()) + if (node_list.empty() || head_idx < 0) return NULL; - return node_list[iter]; + return node_list[head_idx]; } -Node * NodeStack::get_next() +Node * NodeStack::get_next() const { if (node_list.empty()) { DEBUG("Empty\n"); return NULL; } - unsigned int it=iter+1; + unsigned int it = head_idx + 1; if (it == node_list.size()) { DEBUG("At end\n"); return NULL; @@ -454,5 +726,5 @@ Node * NodeStack::get_next() void NodeStack::reset_execution() { - iter = 0; + head_idx = -1; }