Add support for tracking NotExectuted/ExecutedOnceCodeAge's when...

Add support for tracking NotExectuted/ExecutedOnceCodeAge's when --track_gc_object_stats flag is set.

BUG=None
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/40003002

Patch from Ross McIlroy <rmcilroy@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17513 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/builtins.h

@@ -50,7 +50,9 @@ enum BuiltinExtraArguments {
 #define CODE_AGE_LIST(V) \
   CODE_AGE_LIST_WITH_ARG(CODE_AGE_LIST_IGNORE_ARG, V)
 
-#define CODE_AGE_LIST_WITH_NO_AGE(V)               \
+#define CODE_AGE_LIST_COMPLETE(V)                  \
+  V(NotExecuted)                                   \
+  V(ExecutedOnce)                                  \
   V(NoAge)                                         \
   CODE_AGE_LIST_WITH_ARG(CODE_AGE_LIST_IGNORE_ARG, V)
 

src/heap.cc

@@ -7881,17 +7881,18 @@ void Heap::CheckpointObjectStats() {
       static_cast<int>(object_sizes_last_time_[index]));
   FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
-#define ADJUST_LAST_TIME_OBJECT_COUNT(name)                 \
-  index = FIRST_CODE_AGE_SUB_TYPE + Code::k##name##CodeAge; \
-  counters->count_of_CODE_AGE_##name()->Increment(          \
-      static_cast<int>(object_counts_[index]));             \
-  counters->count_of_CODE_AGE_##name()->Decrement(          \
-      static_cast<int>(object_counts_last_time_[index]));   \
-  counters->size_of_CODE_AGE_##name()->Increment(           \
-      static_cast<int>(object_sizes_[index]));              \
-  counters->size_of_CODE_AGE_##name()->Decrement(          \
+#define ADJUST_LAST_TIME_OBJECT_COUNT(name)                                   \
+  index =                                                                     \
+      FIRST_CODE_AGE_SUB_TYPE + Code::k##name##CodeAge - Code::kFirstCodeAge; \
+  counters->count_of_CODE_AGE_##name()->Increment(                            \
+      static_cast<int>(object_counts_[index]));                               \
+  counters->count_of_CODE_AGE_##name()->Decrement(                            \
+      static_cast<int>(object_counts_last_time_[index]));                     \
+  counters->size_of_CODE_AGE_##name()->Increment(                             \
+      static_cast<int>(object_sizes_[index]));                                \
+  counters->size_of_CODE_AGE_##name()->Decrement(                             \
       static_cast<int>(object_sizes_last_time_[index]));
-  CODE_AGE_LIST_WITH_NO_AGE(ADJUST_LAST_TIME_OBJECT_COUNT)
+  CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   OS::MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));

src/heap.h

@@ -1807,7 +1807,7 @@ class Heap {
         FIRST_CODE_KIND_SUB_TYPE + Code::NUMBER_OF_KINDS,
     FIRST_CODE_AGE_SUB_TYPE =
         FIRST_FIXED_ARRAY_SUB_TYPE + LAST_FIXED_ARRAY_SUB_TYPE + 1,
-    OBJECT_STATS_COUNT = FIRST_CODE_AGE_SUB_TYPE + Code::kLastCodeAge + 1
+    OBJECT_STATS_COUNT = FIRST_CODE_AGE_SUB_TYPE + Code::kCodeAgeCount + 1
   };
 
   void RecordObjectStats(InstanceType type, size_t size) {
@@ -1817,12 +1817,17 @@ class Heap {
   }
 
   void RecordCodeSubTypeStats(int code_sub_type, int code_age, size_t size) {
-    ASSERT(code_sub_type < Code::NUMBER_OF_KINDS);
-    ASSERT(code_age < Code::kLastCodeAge);
-    object_counts_[FIRST_CODE_KIND_SUB_TYPE + code_sub_type]++;
-    object_sizes_[FIRST_CODE_KIND_SUB_TYPE + code_sub_type] += size;
-    object_counts_[FIRST_CODE_AGE_SUB_TYPE + code_age]++;
-    object_sizes_[FIRST_CODE_AGE_SUB_TYPE + code_age] += size;
+    int code_sub_type_index = FIRST_CODE_KIND_SUB_TYPE + code_sub_type;
+    int code_age_index =
+        FIRST_CODE_AGE_SUB_TYPE + code_age - Code::kFirstCodeAge;
+    ASSERT(code_sub_type_index >= FIRST_CODE_KIND_SUB_TYPE &&
+           code_sub_type_index < FIRST_CODE_AGE_SUB_TYPE);
+    ASSERT(code_age_index >= FIRST_CODE_AGE_SUB_TYPE &&
+           code_age_index < OBJECT_STATS_COUNT);
+    object_counts_[code_sub_type_index]++;
+    object_sizes_[code_sub_type_index] += size;
+    object_counts_[code_age_index]++;
+    object_sizes_[code_age_index] += size;
   }
 
   void RecordFixedArraySubTypeStats(int array_sub_type, size_t size) {

src/mark-compact.cc

@@ -1650,7 +1650,7 @@ class MarkCompactMarkingVisitor::ObjectStatsTracker<
     int object_size = obj->Size();
     ASSERT(map->instance_type() == CODE_TYPE);
     Code* code_obj = Code::cast(obj);
-    heap->RecordCodeSubTypeStats(code_obj->kind(), code_obj->GetAge(),
+    heap->RecordCodeSubTypeStats(code_obj->kind(), code_obj->GetRawAge(),
                                  object_size);
     ObjectStatsVisitBase(kVisitCode, map, obj);
   }

src/objects.cc

@@ -10663,12 +10663,25 @@ void Code::MarkCodeAsExecuted(byte* sequence, Isolate* isolate) {
 }
 
 
+static Code::Age EffectiveAge(Code::Age age) {
+  if (age == Code::kNotExecutedCodeAge) {
+    // Treat that's never been executed as old immediately.
+    age = Code::kIsOldCodeAge;
+  } else if (age == Code::kExecutedOnceCodeAge) {
+    // Pre-age code that has only been executed once.
+    age = Code::kPreAgedCodeAge;
+  }
+  return age;
+}
+
+
 void Code::MakeOlder(MarkingParity current_parity) {
   byte* sequence = FindCodeAgeSequence();
   if (sequence != NULL) {
     Age age;
     MarkingParity code_parity;
     GetCodeAgeAndParity(sequence, &age, &code_parity);
+    age = EffectiveAge(age);
     if (age != kLastCodeAge && code_parity != current_parity) {
       PatchPlatformCodeAge(GetIsolate(),
                            sequence,
@@ -10680,8 +10693,7 @@ void Code::MakeOlder(MarkingParity current_parity) {
 
 
 bool Code::IsOld() {
-  Age age = GetAge();
-  return age >= kIsOldCodeAge;
+  return GetAge() >= kIsOldCodeAge;
 }
 
 
@@ -10696,9 +10708,14 @@ byte* Code::FindCodeAgeSequence() {
 
 
 Code::Age Code::GetAge() {
+  return EffectiveAge(GetRawAge());
+}
+
+
+Code::Age Code::GetRawAge() {
   byte* sequence = FindCodeAgeSequence();
   if (sequence == NULL) {
-    return Code::kNoAgeCodeAge;
+    return kNoAgeCodeAge;
   }
   Age age;
   MarkingParity parity;
@@ -10729,15 +10746,13 @@ void Code::GetCodeAgeAndParity(Code* code, Age* age,
 #undef HANDLE_CODE_AGE
   stub = *builtins->MarkCodeAsExecutedOnce();
   if (code == stub) {
-    // Treat that's never been executed as old immediatly.
-    *age = kIsOldCodeAge;
+    *age = kNotExecutedCodeAge;
     *parity = NO_MARKING_PARITY;
     return;
   }
   stub = *builtins->MarkCodeAsExecutedTwice();
   if (code == stub) {
-    // Pre-age code that has only been executed once.
-    *age = kPreAgedCodeAge;
+    *age = kExecutedOnceCodeAge;
     *parity = NO_MARKING_PARITY;
     return;
   }

src/objects.h

@@ -5348,8 +5348,9 @@ class Code: public HeapObject {
     kNoAgeCodeAge = 0,
     CODE_AGE_LIST(DECLARE_CODE_AGE_ENUM)
     kAfterLastCodeAge,
+    kFirstCodeAge = kNotExecutedCodeAge,
     kLastCodeAge = kAfterLastCodeAge - 1,
-    kCodeAgeCount = kAfterLastCodeAge - 1,
+    kCodeAgeCount = kAfterLastCodeAge - kNotExecutedCodeAge - 1,
     kIsOldCodeAge = kSexagenarianCodeAge,
     kPreAgedCodeAge = kIsOldCodeAge - 1
   };
@@ -5365,6 +5366,9 @@ class Code: public HeapObject {
   static bool IsYoungSequence(byte* sequence);
   bool IsOld();
   Age GetAge();
+  // Gets the raw code age, including psuedo code-age values such as
+  // kNotExecutedCodeAge and kExecutedOnceCodeAge.
+  Age GetRawAge();
   static inline Code* GetPreAgedCodeAgeStub(Isolate* isolate) {
     return GetCodeAgeStub(isolate, kNotExecutedCodeAge, NO_MARKING_PARITY);
   }

src/v8-counters.cc

@@ -82,7 +82,7 @@ Counters::Counters(Isolate* isolate) {
         StatsCounter(isolate, "c:" "V8.CountOf_CODE_AGE-" #name); \
     size_of_CODE_AGE_##name##_ = \
         StatsCounter(isolate, "c:" "V8.SizeOf_CODE_AGE-" #name);
-    CODE_AGE_LIST_WITH_NO_AGE(SC)
+    CODE_AGE_LIST_COMPLETE(SC)
 #undef SC
 }
 

src/v8-counters.h

@@ -343,7 +343,7 @@ class Counters {
     { return &count_of_CODE_AGE_##name##_; } \
   StatsCounter* size_of_CODE_AGE_##name() \
     { return &size_of_CODE_AGE_##name##_; }
-  CODE_AGE_LIST_WITH_NO_AGE(SC)
+  CODE_AGE_LIST_COMPLETE(SC)
 #undef SC
 
   enum Id {
@@ -373,7 +373,7 @@ class Counters {
 #undef COUNTER_ID
 #define COUNTER_ID(name) kCountOfCODE_AGE__##name, \
     kSizeOfCODE_AGE__##name,
-    CODE_AGE_LIST_WITH_NO_AGE(COUNTER_ID)
+    CODE_AGE_LIST_COMPLETE(COUNTER_ID)
 #undef COUNTER_ID
     stats_counter_count
   };
@@ -423,7 +423,7 @@ class Counters {
 #define SC(name) \
   StatsCounter size_of_CODE_AGE_##name##_; \
   StatsCounter count_of_CODE_AGE_##name##_;
-  CODE_AGE_LIST_WITH_NO_AGE(SC)
+  CODE_AGE_LIST_COMPLETE(SC)
 #undef SC
 
   friend class Isolate;