X-Git-Url: http://plrg.eecs.uci.edu/git/?p=c11tester.git;a=blobdiff_plain;f=action.cc;h=1655d9428eb57041287c7b2bef12e3742b7058f1;hp=73d4c498a2c03a0a26b085fbf6a8b94a289b277a;hb=bad8cc4598438f8b8d9e8fa210e2790f92c9ec44;hpb=3e5a49688722ea039dc6869003bc78531f666d4e diff --git a/action.cc b/action.cc index 73d4c498..1655d942 100644 --- a/action.cc +++ b/action.cc @@ -1,23 +1,24 @@ #include +#define __STDC_FORMAT_MACROS +#include +#include #include "model.h" #include "action.h" #include "clockvector.h" #include "common.h" -ModelAction::ModelAction(action_type_t type, memory_order order, void *loc, int value) +ModelAction::ModelAction(action_type_t type, memory_order order, void *loc, uint64_t value) : + type(type), + order(order), + location(loc), + value(value), + reads_from(NULL), + cv(NULL) { Thread *t = thread_current(); - ModelAction *act = this; - - act->type = type; - act->order = order; - act->location = loc; - act->tid = t->get_id(); - act->value = value; - act->seq_number = model->get_next_seq_num(); - - cv = NULL; + this->tid = t->get_id(); + this->seq_number = model->get_next_seq_num(); } ModelAction::~ModelAction() @@ -26,105 +27,345 @@ ModelAction::~ModelAction() delete cv; } -bool ModelAction::is_read() +void ModelAction::copy_from_new(ModelAction *newaction) +{ + seq_number = newaction->seq_number; +} + +bool ModelAction::is_mutex_op() const +{ + return type == ATOMIC_LOCK || type == ATOMIC_TRYLOCK || type == ATOMIC_UNLOCK; +} + +bool ModelAction::is_lock() const +{ + return type == ATOMIC_LOCK; +} + +bool ModelAction::is_unlock() const +{ + return type == ATOMIC_UNLOCK; +} + +bool ModelAction::is_trylock() const +{ + return type == ATOMIC_TRYLOCK; +} + +bool ModelAction::is_success_lock() const +{ + return type == ATOMIC_LOCK || (type == ATOMIC_TRYLOCK && value == VALUE_TRYSUCCESS); +} + +bool ModelAction::is_failed_trylock() const +{ + return (type == ATOMIC_TRYLOCK && value == VALUE_TRYFAILED); +} + +bool ModelAction::is_read() const { - return type == ATOMIC_READ; + return type == ATOMIC_READ || type == ATOMIC_RMWR || type == ATOMIC_RMW; } -bool ModelAction::is_write() +bool ModelAction::is_write() const { - return type == ATOMIC_WRITE; + return type == ATOMIC_WRITE || type == ATOMIC_RMW || type == ATOMIC_INIT; } -bool ModelAction::is_acquire() +bool ModelAction::is_rmwr() const +{ + return type == ATOMIC_RMWR; +} + +bool ModelAction::is_rmw() const +{ + return type == ATOMIC_RMW; +} + +bool ModelAction::is_rmwc() const +{ + return type == ATOMIC_RMWC; +} + +bool ModelAction::is_fence() const +{ + return type == ATOMIC_FENCE; +} + +bool ModelAction::is_initialization() const +{ + return type == ATOMIC_INIT; +} + +bool ModelAction::is_acquire() const { switch (order) { - case memory_order_acquire: - case memory_order_acq_rel: - case memory_order_seq_cst: + case std::memory_order_acquire: + case std::memory_order_acq_rel: + case std::memory_order_seq_cst: return true; default: return false; } } -bool ModelAction::is_release() +bool ModelAction::is_release() const { switch (order) { - case memory_order_release: - case memory_order_acq_rel: - case memory_order_seq_cst: + case std::memory_order_release: + case std::memory_order_acq_rel: + case std::memory_order_seq_cst: return true; default: return false; } } -bool ModelAction::same_var(ModelAction *act) +bool ModelAction::is_seqcst() const +{ + return order==std::memory_order_seq_cst; +} + +bool ModelAction::same_var(const ModelAction *act) const { return location == act->location; } -bool ModelAction::same_thread(ModelAction *act) +bool ModelAction::same_thread(const ModelAction *act) const { return tid == act->tid; } -bool ModelAction::is_dependent(ModelAction *act) +void ModelAction::copy_typeandorder(ModelAction * act) { + this->type = act->type; + this->order = act->order; +} + +/** This method changes an existing read part of an RMW action into either: + * (1) a full RMW action in case of the completed write or + * (2) a READ action in case a failed action. + * @todo If the memory_order changes, we may potentially need to update our + * clock vector. + */ +void ModelAction::process_rmw(ModelAction * act) { + this->order=act->order; + if (act->is_rmwc()) + this->type=ATOMIC_READ; + else if (act->is_rmw()) { + this->type=ATOMIC_RMW; + this->value=act->value; + } +} + +/** The is_synchronizing method should only explore interleavings if: + * (1) the operations are seq_cst and don't commute or + * (2) the reordering may establish or break a synchronization relation. + * Other memory operations will be dealt with by using the reads_from + * relation. + * + * @param act is the action to consider exploring a reordering. + * @return tells whether we have to explore a reordering. + */ +bool ModelAction::is_synchronizing(const ModelAction *act) const { - if (!is_read() && !is_write()) + //Same thread can't be reordered + if (same_thread(act)) + return false; + + // Different locations commute + if (!same_var(act)) return false; - if (!act->is_read() && !act->is_write()) + + // Explore interleavings of seqcst writes to guarantee total order + // of seq_cst operations that don't commute + if (is_write() && is_seqcst() && act->is_write() && act->is_seqcst()) + return true; + + // Explore synchronizing read/write pairs + if (is_read() && is_acquire() && act->is_write() && act->is_release()) + return true; + if (is_write() && is_release() && act->is_read() && act->is_acquire()) + return true; + + // Otherwise handle by reads_from relation + return false; +} + +bool ModelAction::is_conflicting_lock(const ModelAction *act) const +{ + //Must be different threads to reorder + if (same_thread(act)) return false; - if (same_var(act) && !same_thread(act) && - (is_write() || act->is_write())) + + //Try to reorder a lock past a successful lock + if (act->is_success_lock()) + return true; + + //Try to push a successful trylock past an unlock + if (act->is_unlock() && is_trylock() && value == VALUE_TRYSUCCESS) return true; + return false; } -void ModelAction::create_cv(ModelAction *parent) +/** + * Create a new clock vector for this action. Note that this function allows a + * user to clobber (and leak) a ModelAction's existing clock vector. A user + * should ensure that the vector has already either been rolled back + * (effectively "freed") or freed. + * + * @param parent A ModelAction from which to inherit a ClockVector + */ +void ModelAction::create_cv(const ModelAction *parent) { - ASSERT(cv == NULL); if (parent) cv = new ClockVector(parent->cv, this); else - cv = new ClockVector(); + cv = new ClockVector(NULL, this); +} + +void ModelAction::set_try_lock(bool obtainedlock) { + if (obtainedlock) + value=VALUE_TRYSUCCESS; + else + value=VALUE_TRYFAILED; } -void ModelAction::read_from(ModelAction *act) +/** Update the model action's read_from action */ +void ModelAction::read_from(const ModelAction *act) { ASSERT(cv); - if (act->is_release() && this->is_acquire()) - cv->merge(act->cv); - value = act->value; + reads_from = act; + if (act != NULL && this->is_acquire()) { + rel_heads_list_t release_heads; + model->get_release_seq_heads(this, &release_heads); + for (unsigned int i = 0; i < release_heads.size(); i++) + if (!synchronize_with(release_heads[i])) + model->set_bad_synchronization(); + } +} + +/** + * Synchronize the current thread with the thread corresponding to the + * ModelAction parameter. + * @param act The ModelAction to synchronize with + * @return True if this is a valid synchronization; false otherwise + */ +bool ModelAction::synchronize_with(const ModelAction *act) { + if (*this < *act && type != THREAD_JOIN && type != ATOMIC_LOCK) + return false; + model->check_promises(cv, act->cv); + cv->merge(act->cv); + return true; +} + +bool ModelAction::has_synchronized_with(const ModelAction *act) const +{ + return cv->has_synchronized_with(act->cv); } -void ModelAction::print(void) +/** + * Check whether 'this' happens before act, according to the memory-model's + * happens before relation. This is checked via the ClockVector constructs. + * @return true if this action's thread has synchronized with act's thread + * since the execution of act, false otherwise. + */ +bool ModelAction::happens_before(const ModelAction *act) const { - const char *type_str; + return act->cv->synchronized_since(this); +} + +/** + * Print nicely-formatted info about this ModelAction + * + * @param print_cv True if we want to print clock vector data. Might be false, + * for instance, in situations where the clock vector might be invalid + */ +void ModelAction::print(bool print_cv) const +{ + const char *type_str, *mo_str; switch (this->type) { case THREAD_CREATE: type_str = "thread create"; break; + case THREAD_START: + type_str = "thread start"; + break; case THREAD_YIELD: type_str = "thread yield"; break; case THREAD_JOIN: type_str = "thread join"; break; + case THREAD_FINISH: + type_str = "thread finish"; + break; case ATOMIC_READ: type_str = "atomic read"; break; case ATOMIC_WRITE: type_str = "atomic write"; break; + case ATOMIC_RMW: + type_str = "atomic rmw"; + break; + case ATOMIC_FENCE: + type_str = "fence"; + break; + case ATOMIC_RMWR: + type_str = "atomic rmwr"; + break; + case ATOMIC_RMWC: + type_str = "atomic rmwc"; + break; + case ATOMIC_INIT: + type_str = "init atomic"; + break; + case ATOMIC_LOCK: + type_str = "lock"; + break; + case ATOMIC_UNLOCK: + type_str = "unlock"; + break; + case ATOMIC_TRYLOCK: + type_str = "trylock"; + break; default: type_str = "unknown type"; } - printf("(%3d) Thread: %-2d Action: %-13s MO: %d Loc: %14p Value: %d", - seq_number, id_to_int(tid), type_str, order, location, value); - if (cv) { + uint64_t valuetoprint=type==ATOMIC_READ?(reads_from!=NULL?reads_from->value:VALUE_NONE):value; + + switch (this->order) { + case std::memory_order_relaxed: + mo_str = "relaxed"; + break; + case std::memory_order_acquire: + mo_str = "acquire"; + break; + case std::memory_order_release: + mo_str = "release"; + break; + case std::memory_order_acq_rel: + mo_str = "acq_rel"; + break; + case std::memory_order_seq_cst: + mo_str = "seq_cst"; + break; + default: + mo_str = "unknown"; + break; + } + + printf("(%3d) Thread: %-2d Action: %-13s MO: %7s Loc: %14p Value: %-12" PRIu64, + seq_number, id_to_int(tid), type_str, mo_str, location, valuetoprint); + if (is_read()) { + if (reads_from) + printf(" Rf: %d", reads_from->get_seq_number()); + else + printf(" Rf: ?"); + } + if (cv && print_cv) { printf("\t"); cv->print(); } else