Subzero: Rewrite the pass timing infrastructure.

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
+
+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 &) LLVM_DELETED_FUNCTION;
+  TimerStack &operator=(const TimerStack &) LLVM_DELETED_FUNCTION;
+
+public:
+  TimerStack(const IceString &TopLevelName);
+  static TimerIdT getTimerID(const IceString &Name);
+  void push(TimerIdT ID);
+  void pop(TimerIdT ID);
+  void dump(Ostream &Str);
+
+private:
+  void update();
+  static double timestamp() {
+    // TODO: Implement in terms of std::chrono for C++11.
+    return llvm::TimeRecord::getCurrentTime(false).getWallTime();
+  }
+  const double FirstTimestamp;
+  double LastTimestamp;
+  uint64_t StateChangeCount;
+  static 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