Add new performance option

pkg/analyzer/bin/analyzer.dart

Index: pkg/analyzer/bin/analyzer.dart
diff --git a/pkg/analyzer/bin/analyzer.dart b/pkg/analyzer/bin/analyzer.dart
index d1a22d915eac99001ba3928ca3d9f51c47b817e3..75869d6d4571b51cf0321ba395a7124b9e7f406c 100644
--- a/pkg/analyzer/bin/analyzer.dart
+++ b/pkg/analyzer/bin/analyzer.dart
@@ -24,13 +24,14 @@ void main(args) {
       CommandLineOptions options = CommandLineOptions.parse(args);
       return _runAnalyzer(options, false);
     });
+  } else if (options.perf) {

[scheglov, 2014/04/07 19:20:30]

I don't understand this.
Do nothing when --perf is specified?

[Brian Wilkerson, 2014/04/07 20:05:17]

Good catch! I had originally though I'd need to fork the methods earlier than I
actually did, but forgot to remove this. It's gone now.

+
   } else {
     _runAnalyzer(options, false);
   }
 }
 
 _runAnalyzer(CommandLineOptions options, [bool async = true]) {
-  int startTime = JavaSystem.currentTimeMillis();
   if (!options.machineFormat) {
     stdout.writeln("Analyzing ${options.sourceFiles}...");
   }
@@ -50,6 +51,23 @@ _runAnalyzer(CommandLineOptions options, [bool async = true]) {
     return ErrorSeverity.ERROR;
   }
   // do analyze
+  if (options.warmPerf) {
+    int startTime = JavaSystem.currentTimeMillis();
+    AnalyzerImpl analyzer = new AnalyzerImpl(sourcePath, options, startTime);
+    analyzer.analyzeSync(printMode: 2);
+
+    for (int i = 0; i < 8; i++) {
+      startTime = JavaSystem.currentTimeMillis();
+      analyzer = new AnalyzerImpl(sourcePath, options, startTime);
+      analyzer.analyzeSync(printMode: 0);
+    }
+
+    PerformanceStatistics.reset();
+    startTime = JavaSystem.currentTimeMillis();
+    analyzer = new AnalyzerImpl(sourcePath, options, startTime);
+    return analyzer.analyzeSync();
+  }
+  int startTime = JavaSystem.currentTimeMillis();
   AnalyzerImpl analyzer = new AnalyzerImpl(sourcePath, options, startTime);
   if (async) {
     return analyzer.analyzeAsync();