Runtime call counters and timers.

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index 481c1ca5e67bdcabc5e91b5068539e73ddd710a2..857c56b0588ae201ed984e8defff47914d90550d 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -272,14 +272,29 @@ double ClobberDoubleRegisters(double x1, double x2, double x3, double x4);
 #endif
 
 
-#define RUNTIME_FUNCTION_RETURNS_TYPE(Type, Name)                        \
-static INLINE(Type __RT_impl_##Name(Arguments args, Isolate* isolate));  \
-Type Name(int args_length, Object** args_object, Isolate* isolate) {     \
-  CLOBBER_DOUBLE_REGISTERS();                                            \
-  Arguments args(args_length, args_object);                              \
-  return __RT_impl_##Name(args, isolate);                                \
-}                                                                        \
-static Type __RT_impl_##Name(Arguments args, Isolate* isolate)
+#define RUNTIME_FUNCTION_RETURNS_TYPE(Type, Name)                             \
+  static INLINE(Type __RT_impl_##Name(Arguments args, Isolate* isolate));     \
+  Type Name(int args_length, Object** args_object, Isolate* isolate) {        \
+    CLOBBER_DOUBLE_REGISTERS();                                               \
+    RuntimeCallStats* stats = isolate->runtime_state()->runtime_call_stats(); \
+    stats->Count_##Name++;                                                    \
+    base::ElapsedTimer timer;                                                 \
+    bool timing = false;                                                      \
+    if (FLAG_runtime_call_stats && !stats->in_runtime_call) {                 \
+      stats->in_runtime_call = true;                                          \
+      timing = true;                                                          \
+      timer.Start();                                                          \
+    }                                                                         \
+    Arguments args(args_length, args_object);                                 \
+    Type value = __RT_impl_##Name(args, isolate);                             \
+    if (timing) {                                                             \
+      stats->in_runtime_call = false;                                         \
+      isolate->runtime_state()->runtime_call_stats()->Time_##Name +=          \
+          timer.Elapsed();                                                    \
+    }                                                                         \
+    return value;                                                             \
+  }                                                                           \
+  static Type __RT_impl_##Name(Arguments args, Isolate* isolate)
 
 
 #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name)