[code generation] added basic structure

include/codegen/liveness.h

@@ -1,9 +1,61 @@
 #ifndef TDL_INCLUDE_IR_CODEGEN_LIVENESS_H
 #define TDL_INCLUDE_IR_CODEGEN_LIVENESS_H
 
+#include <map>
+
 namespace tdl{
+
+namespace ir{
+  class value;
+  class function;
+}
+
 namespace codegen{
 
+class layout;
+
+typedef unsigned slot_index;
+
+struct segment {
+  slot_index start;
+  slot_index end;
+
+  bool contains(slot_index idx) const {
+    return start <= idx && idx < end;
+  }
+
+  bool intersect(const segment &Other){
+    return contains(Other.start) || Other.contains(start);
+  }
+};
+
+class liveness {
+private:
+  typedef std::map<ir::value*, slot_index> indices_map_t;
+  typedef std::map<ir::value*, segment>    intervals_map_t;
+  typedef std::map<ir::value*, bool>       has_storage_map_t;
+
+public:
+  /// Intervals iterators...
+  using iterator = intervals_map_t::iterator;
+  using const_iterator = intervals_map_t::const_iterator;
+
+public:
+
+  // accessors
+  const intervals_map_t& intervals() const { return intervals_; }
+  segment get_interval(ir::value* v) const { return intervals_.at(v); }
+
+  // run
+  void run(ir::function *fn);
+
+private:
+  has_storage_map_t has_dedicated_storage_;
+  indices_map_t indices_;
+  intervals_map_t intervals_;
+  layout* layouts_;
+};
+
 }
 }