X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=action.cc;h=893c812a1f39bd33f60a3b97291ffe9a525ae124;hb=745b71256a4b96ddf4843c7f66b11d0cb3daa3cb;hp=5f83c3f5604524692e88e1c9478db7bb9f7216fc;hpb=a0db445e3ecfedce6a85b7b381416b5c363a0614;p=model-checker.git

diff --git a/action.cc b/action.cc
index 5f83c3f..893c812 100644
--- a/action.cc
+++ b/action.cc
@@ -394,7 +394,9 @@ uint64_t ModelAction::get_reads_from_value() const
 	ASSERT(is_read());
 	if (reads_from)
 		return reads_from->get_write_value();
-	return reads_from_promise->get_value();
+	else if (reads_from_promise)
+		return reads_from_promise->get_value();
+	return VALUE_NONE; /* Only for new actions with no reads-from */
 }
 
 /**
@@ -611,3 +613,29 @@ unsigned int ModelAction::hash() const
 		hash ^= reads_from->get_seq_number();
 	return hash;
 }
+
+/**
+ * @brief Checks the NodeStack to see if a ModelAction is in our may-read-from set
+ * @param write The ModelAction to check for
+ * @return True if the ModelAction is found; false otherwise
+ */
+bool ModelAction::may_read_from(const ModelAction *write) const
+{
+	for (int i = 0; i < node->get_read_from_past_size(); i++)
+		if (node->get_read_from_past(i) == write)
+			return true;
+	return false;
+}
+
+/**
+ * @brief Checks the NodeStack to see if a Promise is in our may-read-from set
+ * @param promise The Promise to check for
+ * @return True if the Promise is found; false otherwise
+ */
+bool ModelAction::may_read_from(const Promise *promise) const
+{
+	for (int i = 0; i < node->get_read_from_promise_size(); i++)
+		if (node->get_read_from_promise(i) == promise)
+			return true;
+	return false;
+}