Subzero: Add a few performance measurement tools.

src/IceTimerTree.h

 //===- subzero/src/IceTimerTree.h - Pass timer defs -------------*- 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 TimerTree class, which allows flat and
 // cumulative execution time collection of call chains.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETIMERTREE_H
 #define SUBZERO_SRC_ICETIMERTREE_H
 
+#include "IceTimerTree.def"
+
 namespace Ice {
 
 class TimerTreeNode;
 
 // Timer tree index type
 typedef std::vector<TimerTreeNode>::size_type TTindex;
 
 // TimerTreeNode represents an interior or leaf node in the call tree.
 // It contains a list of children, a pointer to its parent, and the
 // timer ID for the node.  It also holds the cumulative time spent at
 // this node and below.  The children are always at a higher index in
 // the TimerTreeNode::Nodes array, and the parent is always at a lower
 // index.
 class TimerTreeNode {
 public:
   TimerTreeNode() : Parent(0), Interior(0), Time(0) {}
   std::vector<TTindex> Children; // indexed by TimerIdT
   TTindex Parent;
   TimerIdT Interior;
   double Time;
 };
 
 class TimerStack {
-  TimerStack(const TimerStack &) = delete;
+  // TimerStack(const TimerStack &) = delete;
   TimerStack &operator=(const TimerStack &) = delete;
 
 public:
-  TimerStack(const IceString &TopLevelName);
-  static TimerIdT getTimerID(const IceString &Name);
+  enum TimerTag {
+#define X(tag) TT_##tag,
+    TIMERTREE_TABLE
+#undef X
+        TT__num
+  };
+  TimerStack(const IceString &Name);
+  TimerIdT getTimerID(const IceString &Name);
   void push(TimerIdT ID);
   void pop(TimerIdT ID);
-  void dump(Ostream &Str);
+  void dump(Ostream &Str, bool DumpCumulative);
 
 private:
   void update();
   static double timestamp();
+  const IceString Name;
   const double FirstTimestamp;
   double LastTimestamp;
   uint64_t StateChangeCount;
-  static std::vector<IceString> IDs; // indexed by TimerIdT
+  // IDsIndex maps a symbolic timer name to its integer ID.
+  std::map<IceString, TimerIdT> IDsIndex;
+  std::vector<IceString> IDs;        // indexed by TimerIdT
   std::vector<TimerTreeNode> Nodes;  // indexed by TTindex
   std::vector<double> LeafTimes;     // indexed by TimerIdT
   TTindex StackTop;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETIMERTREE_H