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diff --git a/include/llvm/CompilerDriver/Common.td b/include/llvm/CompilerDriver/Common.td
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+//===- Common.td - Common definitions for LLVMC2  ----------*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains common definitions used in llvmc2 tool description files.
+//
+//===----------------------------------------------------------------------===//
+
+class Tool<list<dag> l> {
+      list<dag> properties = l;
+}
+
+// Possible Tool properties.
+
+def in_language;
+def out_language;
+def output_suffix;
+def cmd_line;
+def join;
+def sink;
+def actions;
+
+// Possible option types.
+
+def alias_option;
+def switch_option;
+def parameter_option;
+def parameter_list_option;
+def prefix_option;
+def prefix_list_option;
+
+// Possible option properties.
+
+def extern;
+def help;
+def hidden;
+def multi_val;
+def one_or_more;
+def really_hidden;
+def required;
+def zero_or_one;
+
+// Empty DAG marker.
+def empty;
+
+// The 'case' construct.
+def case;
+
+// Boolean operators.
+def and;
+def or;
+
+// Primitive tests.
+def switch_on;
+def parameter_equals;
+def element_in_list;
+def input_languages_contain;
+def not_empty;
+def default;
+
+// Possible actions.
+
+def append_cmd;
+def forward;
+def forward_as;
+def stop_compilation;
+def unpack_values;
+def error;
+
+// Increase/decrease the edge weight.
+def inc_weight;
+def dec_weight;
+
+// Used to specify plugin priority.
+class PluginPriority<int p> {
+      int priority = p;
+}
+
+// Option list - used to specify aliases and sometimes help strings.
+class OptionList<list<dag> l> {
+      list<dag> options = l;
+}
+
+// Map from suffixes to language names
+
+class LangToSuffixes<string str, list<string> lst> {
+      string lang = str;
+      list<string> suffixes = lst;
+}
+
+class LanguageMap<list<LangToSuffixes> lst> {
+      list<LangToSuffixes> map = lst;
+}
+
+// Compilation graph
+
+class EdgeBase<string t1, string t2, dag d> {
+      string a = t1;
+      string b = t2;
+      dag weight = d;
+}
+
+class Edge<string t1, string t2> : EdgeBase<t1, t2, (empty)>;
+
+// Edge and SimpleEdge are synonyms.
+class SimpleEdge<string t1, string t2> : EdgeBase<t1, t2, (empty)>;
+
+// Optionally enabled edge.
+class OptionalEdge<string t1, string t2, dag props> : EdgeBase<t1, t2, props>;
+
+class CompilationGraph<list<EdgeBase> lst> {
+      list<EdgeBase> edges = lst;
+}