1 files changed, 24 insertions, 4 deletions
diff --git a/tools/llvmc2/Common.td b/tools/llvmc2/Common.td
index ea211e1..4435857 100644
--- a/tools/llvmc2/Common.td
+++ b/tools/llvmc2/Common.td
@@ -15,7 +15,7 @@ class Tool<list<dag> l> {
       list<dag> properties = l;
 }
 
-// Special Tool instance - root of all toolchains
+// Special Tool instance - graph root.
 
 def root : Tool<[]>;
 
@@ -45,6 +45,17 @@ def unpack_values;
 def help;
 def required;
 
+// Possible edge properties
+
+def switch_on;
+def parameter_equals;
+def element_in_list;
+
+// Property combinators
+// TOFIX: implement
+def and;
+def or;
+
 // Map from suffixes to language names
 
 class LangToSuffixes<string str, list<string> lst> {
@@ -58,11 +69,20 @@ class LanguageMap<list<LangToSuffixes> lst> {
 
 // Compilation graph
 
-class Edge<Tool t1, Tool t2> {
+class EdgeBase<Tool t1, Tool t2, list<dag> lst> {
       Tool a = t1;
       Tool b = t2;
+      list<dag> props = lst;
 }
 
-class CompilationGraph<list<Edge> lst> {
-      list<Edge> edges = lst;
+class Edge<Tool t1, Tool t2> : EdgeBase<t1, t2, []>;
+
+// Edge and DefaultEdge are synonyms.
+class DefaultEdge<Tool t1, Tool t2> : EdgeBase<t1, t2, []>;
+
+// Optionally enabled edge.
+class OptionalEdge<Tool t1, Tool t2, list<dag> lst> : EdgeBase<t1, t2, lst>;
+
+class CompilationGraph<list<EdgeBase> lst> {
+      list<EdgeBase> edges = lst;
 }