X-Git-Url: http://plrg.eecs.uci.edu/git/?p=cdsspec-compiler.git;a=blobdiff_plain;f=promise.cc;h=26a1095f4440a4b65d80dd67917da2f423ab28fe;hp=7f6f5e7b1823bb5dd3285196ba57f4ee172b0f37;hb=7ee05d0cce29addaf73326e0eeac08bc7eb39e79;hpb=ac4c9ec2a1ddb227fbe88ee505f7126485b94cb9

diff --git a/promise.cc b/promise.cc
index 7f6f5e7..26a1095 100644
--- a/promise.cc
+++ b/promise.cc
@@ -1,6 +1,51 @@
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
 #include "promise.h"
 #include "model.h"
 #include "schedule.h"
+#include "action.h"
+#include "threads-model.h"
+
+/**
+ * @brief Promise constructor
+ * @param read The read which reads from a promised future value
+ * @param fv The future value that is promised
+ */
+Promise::Promise(ModelAction *read, struct future_value fv) :
+	num_available_threads(0),
+	fv(fv),
+	readers(1, read),
+	write(NULL)
+{
+	add_thread(fv.tid);
+	eliminate_thread(read->get_tid());
+}
+
+/**
+ * Add a reader that reads from this Promise. Must be added in an order
+ * consistent with execution order.
+ *
+ * @param reader The ModelAction that reads from this promise. Must be a read.
+ * @return True if this new reader has invalidated the promise; false otherwise
+ */
+bool Promise::add_reader(ModelAction *reader)
+{
+	readers.push_back(reader);
+	return eliminate_thread(reader->get_tid());
+}
+
+/**
+ * Access a reader that read from this Promise. Readers must be inserted in
+ * order by execution order, so they can be returned in this order.
+ *
+ * @param i The index of the reader to return
+ * @return The i'th reader of this Promise
+ */
+ModelAction * Promise::get_reader(unsigned int i) const
+{
+	return i < readers.size() ? readers[i] : NULL;
+}
 
 /**
  * Eliminate a thread which no longer can satisfy this promise. Once all
@@ -13,27 +58,60 @@
 bool Promise::eliminate_thread(thread_id_t tid)
 {
 	unsigned int id = id_to_int(tid);
-	if (id >= eliminated_thread.size())
-		eliminated_thread.resize(id + 1, false);
-	if (eliminated_thread[id])
+	if (!thread_is_available(tid))
 		return false;
 
-	eliminated_thread[id] = true;
+	available_thread[id] = false;
+	num_available_threads--;
 	return has_failed();
 }
 
 /**
- * Check if a thread has already been eliminated from resolving this
- * promise
+ * Add a thread which may resolve this promise
+ *
+ * @param tid The thread ID
+ */
+void Promise::add_thread(thread_id_t tid)
+{
+	unsigned int id = id_to_int(tid);
+	if (id >= available_thread.size())
+		available_thread.resize(id + 1, false);
+	if (!available_thread[id]) {
+		available_thread[id] = true;
+		num_available_threads++;
+	}
+}
+
+/**
+ * Check if a thread is available for resolving this promise. That is, the
+ * thread must have been previously marked for resolving this promise, and it
+ * cannot have been eliminated due to synchronization, etc.
+ *
  * @param tid Thread ID of the thread to check
- * @return True if the thread is already eliminated; false otherwise
+ * @return True if the thread is available; false otherwise
  */
-bool Promise::thread_is_eliminated(thread_id_t tid) const
+bool Promise::thread_is_available(thread_id_t tid) const
 {
 	unsigned int id = id_to_int(tid);
-	if (id >= eliminated_thread.size())
+	if (id >= available_thread.size())
 		return false;
-	return eliminated_thread[id];
+	return available_thread[id];
+}
+
+/** @brief Print debug info about the Promise */
+void Promise::print() const
+{
+	model_print("Promised value %#" PRIx64 ", first read from thread %d, available threads to resolve: ",
+			fv.value, id_to_int(get_reader(0)->get_tid()));
+	bool failed = true;
+	for (unsigned int i = 0; i < available_thread.size(); i++)
+		if (available_thread[i]) {
+			model_print("[%d]", i);
+			failed = false;
+		}
+	if (failed)
+		model_print("(none)");
+	model_print("\n");
 }
 
 /**
@@ -44,12 +122,47 @@ bool Promise::thread_is_eliminated(thread_id_t tid) const
  */
 bool Promise::has_failed() const
 {
-	unsigned int size = eliminated_thread.size();
-	int promise_tid = id_to_int(read->get_tid());
-	for (unsigned int i = 1; i < model->get_num_threads(); i++) {
-		if ((i >= size || !eliminated_thread[i]) && ((int)i != promise_tid) && model->is_enabled(int_to_id(i))) {
-			return false;
-		}
-	}
-	return true;
+	return num_available_threads == 0;
+}
+
+/**
+ * @brief Check if an action's thread and location are compatible for resolving
+ * this promise
+ * @param act The action to check against
+ * @return True if we are compatible; false otherwise
+ */
+bool Promise::is_compatible(const ModelAction *act) const
+{
+	return thread_is_available(act->get_tid()) && get_reader(0)->same_var(act);
+}
+
+/**
+ * @brief Check if an action's thread and location are compatible for resolving
+ * this promise, and that the promise is thread-exclusive
+ * @param act The action to check against
+ * @return True if we are compatible and exclusive; false otherwise
+ */
+bool Promise::is_compatible_exclusive(const ModelAction *act) const
+{
+	return get_num_available_threads() == 1 && is_compatible(act);
+}
+
+/**
+ * @brief Check if a store's value matches this Promise
+ * @param write The store to check
+ * @return True if the store's written value matches this Promise
+ */
+bool Promise::same_value(const ModelAction *write) const
+{
+	return get_value() == write->get_write_value();
+}
+
+/**
+ * @brief Check if a ModelAction's location matches this Promise
+ * @param act The ModelAction to check
+ * @return True if the action's location matches this Promise
+ */
+bool Promise::same_location(const ModelAction *act) const
+{
+	return get_reader(0)->same_var(act);
 }