Subzero: Add a few performance measurement tools.

src/IceGlobalContext.h

 //===- subzero/src/IceGlobalContext.h - Global context 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 aspects of the compilation that persist across
 // multiple functions.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEGLOBALCONTEXT_H
 #define SUBZERO_SRC_ICEGLOBALCONTEXT_H
 
 #include <memory>
 
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include "IceDefs.h"
 #include "IceIntrinsics.h"
 #include "IceRNG.h"
+#include "IceTimerTree.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class ClFlags;
 
 // This class collects rudimentary statistics during translation.
 class CodeStats {
 public:
   CodeStats()
@@ skipping 28 matching lines @@
 class GlobalContext {
 public:
   GlobalContext(llvm::raw_ostream *OsDump, llvm::raw_ostream *OsEmit,
                 VerboseMask Mask, TargetArch Arch, OptLevel Opt,
                 IceString TestPrefix, const ClFlags &Flags);
   ~GlobalContext();
 
   // Returns true if any of the specified options in the verbose mask
   // are set.  If the argument is omitted, it checks if any verbose
   // options at all are set.
+  VerboseMask getVerbose() const { return VMask; }
   bool isVerbose(VerboseMask Mask = IceV_All) const { return VMask & Mask; }
   void setVerbose(VerboseMask Mask) { VMask = Mask; }
   void addVerbose(VerboseMask Mask) { VMask |= Mask; }
   void subVerbose(VerboseMask Mask) { VMask &= ~Mask; }
 
   Ostream &getStrDump() { return *StrDump; }
   Ostream &getStrEmit() { return *StrEmit; }
 
   TargetArch getTargetArch() const { return Arch; }
   OptLevel getOptLevel() const { return Opt; }
@@ skipping 60 matching lines @@
   }
   void statsUpdateSpills() {
     StatsFunction.updateSpills();
     StatsCumulative.updateSpills();
   }
   void statsUpdateFills() {
     StatsFunction.updateFills();
     StatsCumulative.updateFills();
   }
 
-  static TimerIdT getTimerID(const IceString &Name);
-  void pushTimer(TimerIdT ID);
-  void popTimer(TimerIdT ID);
-  void dumpTimers();
+  // These are predefined TimerStackIdT values.
+  enum TimerStackKind {
+    TSK_Default = 0,
+    TSK_Funcs,
+    TSK_Num
+  };
+
+  TimerIdT getTimerID(TimerStackIdT StackID, const IceString &Name);
+  TimerStackIdT newTimerStackID(const IceString &Name);
+  void pushTimer(TimerIdT ID, TimerStackIdT StackID = TSK_Default);
+  void popTimer(TimerIdT ID, TimerStackIdT StackID = TSK_Default);
+  void dumpTimers(TimerStackIdT StackID = TSK_Default,
+                  bool DumpCumulative = true);
 
 private:
   Ostream *StrDump; // Stream for dumping / diagnostics
   Ostream *StrEmit; // Stream for code emission
 
   llvm::BumpPtrAllocator Allocator;
   VerboseMask VMask;
   std::unique_ptr<class ConstantPool> ConstPool;
   Intrinsics IntrinsicsInfo;
   const TargetArch Arch;
   const OptLevel Opt;
   const IceString TestPrefix;
   const ClFlags &Flags;
   bool HasEmittedFirstMethod;
   RandomNumberGenerator RNG;
   CodeStats StatsFunction;
   CodeStats StatsCumulative;
-  std::unique_ptr<class TimerStack> Timers;
+  std::vector<TimerStack> Timers;
   GlobalContext(const GlobalContext &) = delete;
   GlobalContext &operator=(const GlobalContext &) = delete;
 
   // Private helpers for mangleName()
   typedef llvm::SmallVector<char, 32> ManglerVector;
   void incrementSubstitutions(ManglerVector &OldName) const;
 };
 
 // Helper class to push and pop a timer marker.  The constructor
 // pushes a marker, and the destructor pops it.  This is for
 // convenient timing of regions of code.
 class TimerMarker {
   TimerMarker(const TimerMarker &) = delete;
   TimerMarker &operator=(const TimerMarker &) = delete;
 
 public:
   TimerMarker(TimerIdT ID, GlobalContext *Ctx)
       : ID(ID), Ctx(Ctx), Active(Ctx->getFlags().SubzeroTimingEnabled) {
     if (Active)
       Ctx->pushTimer(ID);
   }
+  TimerMarker(TimerIdT ID, const Cfg *Func);
+
   ~TimerMarker() {
     if (Active)
       Ctx->popTimer(ID);
   }
 
 private:
   TimerIdT ID;
   GlobalContext *const Ctx;
   const bool Active;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H