remove extraneous namespace qualifier, PR2142

[oota-llvm.git] / lib / Support / Statistic.cpp

diff --git a/lib/Support/Statistic.cpp b/lib/Support/Statistic.cpp
index a6b2dbdef6abd6bbf36b1c89f02aa4b7d6bb80f4..e500b55f5f54f2c0823dc10bed3fc58a828d8b86 100644 (file)
--- a/lib/Support/Statistic.cpp
+++ b/lib/Support/Statistic.cpp
@@ -1,4 +1,11 @@
-//===-- StatisticReporter.cpp - Easy way to expose stats information -------==//
+//===-- Statistic.cpp - Easy way to expose stats information --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
 //
 // This file implements the 'Statistic' class, which is designed to be an easy
 // way to expose various success metrics from passes.  These statistics are
@@ -8,35 +15,108 @@
 // This is useful for reporting information like the number of instructions
 // simplified, optimized or removed by various transformations, like this:
 //
-// static Statistic<> NumInstEliminated("GCSE - Number of instructions killed");
+// static Statistic NumInstEliminated("GCSE", "Number of instructions killed");
 //
 // Later, in the code: ++NumInstEliminated;
 //
 //===----------------------------------------------------------------------===//
 
-#include "Support/StatisticReporter.h"
-#include "Support/CommandLine.h"
-#include <iostream>
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/ADT/StringExtras.h"
+#include <algorithm>
+#include <ostream>
+#include <cstring>
+using namespace llvm;
 
-bool DebugFlag;  // DebugFlag - Exported boolean set by the -debug option
+// GetLibSupportInfoOutputFile - Return a file stream to print our output on.
+namespace llvm { extern std::ostream *GetLibSupportInfoOutputFile(); }
 
-// -stats - Command line option to cause transformations to emit stats about
-// what they did.
-//
+/// -stats - Command line option to cause transformations to emit stats about
+/// what they did.
+///
 static cl::opt<bool>
 Enabled("stats", cl::desc("Enable statistics output from program"));
 
-// -debug - Command line option to enable the DEBUG statements in the passes.
-static cl::opt<bool, true>
-Debug("debug", cl::desc("Enable debug output"), cl::Hidden,
-      cl::location(DebugFlag));
-
-// Print information when destroyed, iff command line option is specified
-void StatisticBase::destroy() const {
-  if (Enabled && hasSomeData()) {
-    std::cerr.width(7);
-    printValue(std::cerr);
-    std::cerr.width(0);
-    std::cerr << "\t" << Name << "\n";
+
+namespace {
+/// StatisticInfo - This class is used in a ManagedStatic so that it is created
+/// 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;
+public:
+  ~StatisticInfo();
+  
+  void addStatistic(const Statistic *S) {
+    Stats.push_back(S);
+  }
+};
+}
+
+static ManagedStatic<StatisticInfo> StatInfo;
+
+
+/// RegisterStatistic - The first time a statistic is bumped, this method is
+/// called.
+void Statistic::RegisterStatistic() {
+  // If stats are enabled, inform StatInfo that this statistic should be
+  // printed.
+  if (Enabled)
+    StatInfo->addStatistic(this);
+  // Remember we have been registered.
+  Initialized = true;
+}
+
+struct NameCompare {
+  bool operator()(const Statistic *LHS, const Statistic *RHS) const {
+    int Cmp = std::strcmp(LHS->getName(), RHS->getName());
+    if (Cmp != 0) return Cmp < 0;
+    
+    // Secondary key is the description.
+    return std::strcmp(LHS->getDesc(), RHS->getDesc()) < 0;
+  }
+};
+
+// Print information when destroyed, iff command line option is specified.
+StatisticInfo::~StatisticInfo() {
+  // Statistics not enabled?
+  if (Stats.empty()) return;
+
+  // Get the stream to write to.
+  std::ostream &OutStream = *GetLibSupportInfoOutputFile();
+
+  // Figure out how long the biggest Value and Name fields are.
+  unsigned MaxNameLen = 0, MaxValLen = 0;
+  for (unsigned i = 0, e = Stats.size(); i != e; ++i) {
+    MaxValLen = std::max(MaxValLen,
+                         (unsigned)utostr(Stats[i]->getValue()).size());
+    MaxNameLen = std::max(MaxNameLen,
+                          (unsigned)std::strlen(Stats[i]->getName()));
+  }
+  
+  // Sort the fields by name.
+  std::stable_sort(Stats.begin(), Stats.end(), NameCompare());
+
+  // Print out the statistics header...
+  OutStream << "===" << std::string(73, '-') << "===\n"
+            << "                          ... Statistics Collected ...\n"
+            << "===" << std::string(73, '-') << "===\n\n";
+  
+  // Print all of the statistics.
+  for (unsigned i = 0, e = Stats.size(); i != e; ++i) {
+    std::string CountStr = utostr(Stats[i]->getValue());
+    OutStream << std::string(MaxValLen-CountStr.size(), ' ')
+              << CountStr << " " << Stats[i]->getName()
+              << std::string(MaxNameLen-std::strlen(Stats[i]->getName()), ' ')
+              << " - " << Stats[i]->getDesc() << "\n";
+    
   }
+  
+  OutStream << std::endl;  // Flush the output stream...
+  
+  if (&OutStream != cerr.stream() && &OutStream != cout.stream())
+    delete &OutStream;   // Close the file.
 }