X-Git-Url: http://plrg.eecs.uci.edu/git/?p=cdsspec-compiler.git;a=blobdiff_plain;f=nodestack.cc;h=b4f75e0336a3afdc3978b7ecb086e459423df455;hp=0be23af47643d269f207e80a474e03ea4ab84847;hb=caa1df880547acce2804221c8e6995170a5121eb;hpb=424d7c7ac7b4f10da72e9da25a1346c00298af3a diff --git a/nodestack.cc b/nodestack.cc index 0be23af..b4f75e0 100644 --- a/nodestack.cc +++ b/nodestack.cc @@ -4,7 +4,7 @@ #include "action.h" #include "common.h" #include "model.h" -#include "threads.h" +#include "threads-model.h" /** * @brief Node constructor @@ -32,7 +32,11 @@ Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) may_read_from(), read_from_index(0), future_values(), - future_index(-1) + future_index(-1), + relseq_break_writes(), + relseq_break_index(0), + misc_index(0), + misc_max(0) { if (act) { act->set_node(this); @@ -47,7 +51,7 @@ Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) if (prevfi) { *fi=*prevfi; } - if (parent->enabled_array[i]) { + if (parent->is_enabled(int_to_id(i))) { fi->enabled_count++; } if (i==currtid) { @@ -56,7 +60,7 @@ Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) } //Do window processing if (prevfairness != NULL) { - if (prevfairness -> parent->enabled_array[i]) + if (prevfairness -> parent->is_enabled(int_to_id(i))) fi->enabled_count--; if (i==prevtid) { fi->turns--; @@ -101,11 +105,14 @@ void Node::print_may_read_from() * Sets a promise to explore meeting with the given node. * @param i is the promise index. */ -void Node::set_promise(unsigned int i) { +void Node::set_promise(unsigned int i, bool is_rmw) { if (i >= promises.size()) promises.resize(i + 1, PROMISE_IGNORE); - if (promises[i] == PROMISE_IGNORE) + if (promises[i] == PROMISE_IGNORE) { promises[i] = PROMISE_UNFULFILLED; + if (is_rmw) + promises[i] |= PROMISE_RMW; + } } /** @@ -114,7 +121,7 @@ void Node::set_promise(unsigned int i) { * @return true if the promise should be satisfied by the given model action. */ bool Node::get_promise(unsigned int i) { - return (i < promises.size()) && (promises[i] == PROMISE_FULFILLED); + return (i < promises.size()) && ((promises[i] & PROMISE_MASK) == PROMISE_FULFILLED); } /** @@ -123,16 +130,27 @@ bool Node::get_promise(unsigned int i) { */ bool Node::increment_promise() { DBG(); - + unsigned int rmw_count=0; + for (unsigned int i = 0; i < promises.size(); i++) { + if (promises[i]==(PROMISE_RMW|PROMISE_FULFILLED)) + rmw_count++; + } + for (unsigned int i = 0; i < promises.size(); i++) { - if (promises[i] == PROMISE_UNFULFILLED) { - promises[i] = PROMISE_FULFILLED; + if ((promises[i] & PROMISE_MASK) == PROMISE_UNFULFILLED) { + if ((rmw_count > 0) && (promises[i] & PROMISE_RMW)) { + //sending our value to two rmws... not going to work..try next combination + continue; + } + promises[i] = (promises[i] & PROMISE_RMW) |PROMISE_FULFILLED; while (i > 0) { i--; - if (promises[i] == PROMISE_FULFILLED) - promises[i] = PROMISE_UNFULFILLED; + if ((promises[i] & PROMISE_MASK) == PROMISE_FULFILLED) + promises[i] = (promises[i] & PROMISE_RMW) | PROMISE_UNFULFILLED; } return true; + } else if (promises[i] == (PROMISE_RMW|PROMISE_FULFILLED)) { + rmw_count--; } } return false; @@ -143,33 +161,70 @@ bool Node::increment_promise() { * @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 fulfilledrmw=false; + for (int i = promises.size()-1 ; i>=0; i--) { + if (promises[i]==PROMISE_UNFULFILLED) + return false; + if (!fulfilledrmw && ((promises[i]&PROMISE_MASK)==PROMISE_UNFULFILLED)) return false; + if (promises[i]==(PROMISE_FULFILLED|PROMISE_RMW)) + fulfilledrmw=true; + } return true; } + +void Node::set_misc_max(int i) { + misc_max=i; +} + +int Node::get_misc() { + return misc_index; +} + +bool Node::increment_misc() { + return (misc_index=misc_max; +} + + /** - * Adds a value from a weakly ordered future write to backtrack to. + * 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(uint64_t value, modelclock_t expiration) { - int suitableindex=-1; + 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) { - if (future_values[i].expiration>=expiration) + if (expiration <= future_values[i].expiration) return false; - if (future_index < ((int) i)) { - suitableindex=i; - } + idx = i; } } - - if (suitableindex!=-1) { - future_values[suitableindex].expiration=expiration; + 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; } - struct future_value newfv={value, expiration}; + + /* Limit the size of the future-values set */ + if (model->params.maxfuturevalues > 0 && + (int)future_values.size() >= model->params.maxfuturevalues) + return false; + + struct future_value newfv = {value, expiration}; future_values.push_back(newfv); return true; } @@ -216,15 +271,15 @@ bool Node::read_from_empty() { * Mark the appropriate backtracking information for exploring a thread choice. * @param act The ModelAction to explore */ -void Node::explore_child(ModelAction *act, bool * is_enabled) +void Node::explore_child(ModelAction *act, enabled_type_t * is_enabled) { if ( ! enabled_array ) - enabled_array=(bool *)model_malloc(sizeof(bool)*num_threads); + enabled_array=(enabled_type_t *)model_malloc(sizeof(enabled_type_t)*num_threads); if (is_enabled != NULL) - memcpy(enabled_array, is_enabled, sizeof(bool)*num_threads); + memcpy(enabled_array, is_enabled, sizeof(enabled_type_t)*num_threads); else { for(int i=0;iget_tid()); @@ -240,6 +295,7 @@ void Node::explore_child(ModelAction *act, bool * 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; @@ -265,13 +321,21 @@ thread_id_t Node::get_next_backtrack() bool Node::is_enabled(Thread *t) { int thread_id=id_to_int(t->get_id()); - return thread_id < num_threads && enabled_array[thread_id]; + return thread_id < num_threads && (enabled_array[thread_id] != THREAD_DISABLED); +} + +enabled_type_t Node::enabled_status(thread_id_t tid) { + int thread_id=id_to_int(tid); + if (thread_id < num_threads) + return enabled_array[thread_id]; + else + return THREAD_DISABLED; } bool Node::is_enabled(thread_id_t tid) { int thread_id=id_to_int(tid); - return thread_id < num_threads && enabled_array[thread_id]; + return thread_id < num_threads && (enabled_array[thread_id] != THREAD_DISABLED); } bool Node::has_priority(thread_id_t tid) @@ -294,12 +358,12 @@ void Node::add_read_from(const ModelAction *act) * @return The first element in future_values */ uint64_t Node::get_future_value() { - ASSERT(future_index<((int)future_values.size())); + ASSERT(future_index >= 0 && future_index<((int)future_values.size())); return future_values[future_index].value; } modelclock_t Node::get_future_value_expiration() { - ASSERT(future_index<((int)future_values.size())); + ASSERT(future_index >= 0 && future_index<((int)future_values.size())); return future_values[future_index].expiration; } @@ -352,9 +416,62 @@ bool Node::increment_future_value() { return false; } +/** + * 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() +{ + 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(); + promises.clear(); + 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() { + 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--; @@ -372,6 +489,8 @@ NodeStack::NodeStack() : NodeStack::~NodeStack() { + for (unsigned int i = 0; i < node_list.size(); i++) + delete node_list[i]; } void NodeStack::print() @@ -389,7 +508,7 @@ void NodeStack::print() /** Note: The is_enabled set contains what actions were enabled when * act was chosen. */ -ModelAction * NodeStack::explore_action(ModelAction *act, bool * is_enabled) +ModelAction * NodeStack::explore_action(ModelAction *act, enabled_type_t * is_enabled) { DBG();