Initial skeleton of Subzero.

src/IceCfgNode.h

Index: src/IceCfgNode.h
diff --git a/src/IceCfgNode.h b/src/IceCfgNode.h
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+++ b/src/IceCfgNode.h
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+//===- subzero/src/IceCfgNode.h - Control flow graph node -------*- C++ -*-===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the CfgNode class, which represents a single
+// basic block as its instruction list, in-edge list, and out-edge
+// list.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICECFGNODE_H
+#define SUBZERO_SRC_ICECFGNODE_H
+
+#include "IceDefs.h"
+
+namespace Ice {
+
+class CfgNode {
+public:
+  static CfgNode *create(IceCfg *Cfg, IceSize_t LabelIndex,
+                         IceString Name = "") {
+    return new (Cfg->allocate<CfgNode>()) CfgNode(Cfg, LabelIndex, Name);
+  }
+
+  // Access the label number and name for this node.
+  IceSize_t getIndex() const { return Number; }
+  IceString getName() const;
+
+  // Access predecessor and successor edge lists.
+  const NodeList &getInEdges() const { return InEdges; }
+  const NodeList &getOutEdges() const { return OutEdges; }
+
+  // Manage the instruction list.
+  InstList &getInsts() { return Insts; }
+  void appendInst(Inst *Inst);
+
+  // Add a predecessor edge to the InEdges list for each of this
+  // node's successors.
+  void computePredecessors();
+
+  void dump(IceCfg *Cfg) const;
+
+private:
+  CfgNode(IceCfg *Cfg, IceSize_t LabelIndex, IceString Name);
+  CfgNode(const CfgNode &) LLVM_DELETED_FUNCTION;
+  CfgNode &operator=(const CfgNode &) LLVM_DELETED_FUNCTION;
+  IceCfg *const Cfg;
+  const IceSize_t Number; // label index
+  IceString Name;         // for dumping only
+  NodeList InEdges;       // in no particular order
+  NodeList OutEdges;      // in no particular order
+  PhiList Phis;           // unordered set of phi instructions
+  InstList Insts;         // ordered list of non-phi instructions
+};
+
+} // end of namespace Ice
+
+#endif // SUBZERO_SRC_ICECFGNODE_H