Refactor statistic a big and introduce a horrible-but-necessary macro

(STATISTIC), which allows us to define statistics that don't introduce
static ctors into the .o files.  I'm migrating code over to use this
incrementally.

llvm-svn: 32687

llvm/include/llvm/ADT/Statistic.h

@@ -28,16 +28,12 @@
 
 namespace llvm {
 
-class Statistic {
+class StatisticBase {
+public:
   const char *Name;
   const char *Desc;
   unsigned Value : 31;
   bool Initialized : 1;
-public:
-  // Normal constructor, default initialize data item...
-  Statistic(const char *name, const char *desc)
-    : Name(name), Desc(desc), Value(0), Initialized(0) {
-  }
 
   unsigned getValue() const { return Value; }
   const char *getName() const { return Name; }
@@ -45,23 +41,35 @@ public:
   
   // Allow use of this class as the value itself.
   operator unsigned() const { return Value; }
-  const Statistic &operator=(unsigned Val) { Value = Val; return init(); }
-  const Statistic &operator++() { ++Value; return init(); }
+  const StatisticBase &operator=(unsigned Val) { Value = Val; return init(); }
+  const StatisticBase &operator++() { ++Value; return init(); }
   unsigned operator++(int) { init(); return Value++; }
-  const Statistic &operator--() { --Value; return init(); }
+  const StatisticBase &operator--() { --Value; return init(); }
   unsigned operator--(int) { init(); return Value--; }
-  const Statistic &operator+=(const unsigned &V) { Value += V; return init(); }
-  const Statistic &operator-=(const unsigned &V) { Value -= V; return init(); }
-  const Statistic &operator*=(const unsigned &V) { Value *= V; return init(); }
-  const Statistic &operator/=(const unsigned &V) { Value /= V; return init(); }
+  const StatisticBase &operator+=(const unsigned &V) {Value += V;return init();}
+  const StatisticBase &operator-=(const unsigned &V) {Value -= V;return init();}
+  const StatisticBase &operator*=(const unsigned &V) {Value *= V;return init();}
+  const StatisticBase &operator/=(const unsigned &V) {Value /= V;return init();}
   
 private:
-  Statistic &init() {
+  StatisticBase &init() {
     if (!Initialized) RegisterStatistic();
     return *this;
   }
   void RegisterStatistic();
 };
+  
+struct Statistic : public StatisticBase {
+  Statistic(const char *name, const char *desc) {
+    Name = name; Desc = desc; Value = 0; Initialized = 0;
+  }
+};
+
+  
+// STATISTIC - A macro to make definition of statistics really simple.  This
+// automatically passes the DEBUG_TYPE of the file into the statistic.
+#define STATISTIC(VARNAME, DESC) \
+  static StatisticBase VARNAME = { DEBUG_TYPE, DESC, 0, 0 }
 
 } // End llvm namespace
 

llvm/lib/Support/Statistic.cpp

@@ -45,11 +45,11 @@ namespace {
 /// on demand (when the first statistic is bumped) and destroyed only when 
 /// llvm_shutdown is called.  We print statistics from the destructor.
 class StatisticInfo {
-  std::vector<const Statistic*> Stats;
+  std::vector<const StatisticBase*> Stats;
 public:
   ~StatisticInfo();
   
-  void addStatistic(const Statistic *S) {
+  void addStatistic(const StatisticBase *S) {
     Stats.push_back(S);
   }
 };
@@ -60,7 +60,7 @@ static ManagedStatic<StatisticInfo> StatInfo;
 
 /// RegisterStatistic - The first time a statistic is bumped, this method is
 /// called.
-void Statistic::RegisterStatistic() {
+void StatisticBase::RegisterStatistic() {
   // If stats are enabled, inform StatInfo that this statistic should be
   // printed.
   if (Enabled)
@@ -70,7 +70,7 @@ void Statistic::RegisterStatistic() {
 }
 
 struct NameCompare {
-  bool operator()(const Statistic *LHS, const Statistic *RHS) const {
+  bool operator()(const StatisticBase *LHS, const StatisticBase *RHS) const {
     int Cmp = std::strcmp(LHS->getName(), RHS->getName());
     if (Cmp != 0) return Cmp < 0;