Merged r17432, r17526, r17545, r17620, r17747 into 3.20 branch.

src/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 691 matching lines @@
   return next_gc_likely_to_collect_more;
 }
 
 
 int Heap::NotifyContextDisposed() {
   if (FLAG_parallel_recompilation) {
     // Flush the queued recompilation tasks.
     isolate()->optimizing_compiler_thread()->Flush();
   }
   flush_monomorphic_ics_ = true;
+  AgeInlineCaches();
   return ++contexts_disposed_;
 }
 
 
 void Heap::PerformScavenge() {
   GCTracer tracer(this, NULL, NULL);
   if (incremental_marking()->IsStopped()) {
     PerformGarbageCollection(SCAVENGER, &tracer);
   } else {
     PerformGarbageCollection(MARK_COMPACTOR, &tracer);
@@ skipping 366 matching lines @@
   MarkCompactPrologue();
 
   mark_compact_collector_.CollectGarbage();
 
   LOG(isolate_, ResourceEvent("markcompact", "end"));
 
   gc_state_ = NOT_IN_GC;
 
   isolate_->counters()->objs_since_last_full()->Set(0);
 
-  contexts_disposed_ = 0;
-
   flush_monomorphic_ics_ = false;
 }
 
 
 void Heap::MarkCompactPrologue() {
   // At any old GC clear the keyed lookup cache to enable collection of unused
   // maps.
   isolate_->keyed_lookup_cache()->Clear();
   isolate_->context_slot_cache()->Clear();
   isolate_->descriptor_lookup_cache()->Clear();
@@ skipping 2883 matching lines @@
     buffer[0] = static_cast<uint8_t>(code);
     Object* result;
     MaybeObject* maybe_result =
         InternalizeOneByteString(Vector<const uint8_t>(buffer, 1));
 
     if (!maybe_result->ToObject(&result)) return maybe_result;
     single_character_string_cache()->set(code, result);
     return result;
   }
 
-  Object* result;
+  SeqTwoByteString* result;
   { MaybeObject* maybe_result = AllocateRawTwoByteString(1);
-    if (!maybe_result->ToObject(&result)) return maybe_result;
+    if (!maybe_result->To<SeqTwoByteString>(&result)) return maybe_result;
   }
-  String* answer = String::cast(result);
-  answer->Set(0, code);
-  return answer;
+  result->SeqTwoByteStringSet(0, code);
+  return result;
 }
 
 
 MaybeObject* Heap::AllocateByteArray(int length, PretenureFlag pretenure) {
   if (length < 0 || length > ByteArray::kMaxLength) {
     return Failure::OutOfMemoryException(0x7);
   }
   if (pretenure == NOT_TENURED) {
     return AllocateByteArray(length);
   }
@@ skipping 1930 matching lines @@
   // Minimal hint that allows to do full GC.
   const int kMinHintForFullGC = 100;
   intptr_t size_factor = Min(Max(hint, 20), kMaxHint) / 4;
   // The size factor is in range [5..250]. The numbers here are chosen from
   // experiments. If you changes them, make sure to test with
   // chrome/performance_ui_tests --gtest_filter="GeneralMixMemoryTest.*
   intptr_t step_size =
       size_factor * IncrementalMarking::kAllocatedThreshold;
 
   if (contexts_disposed_ > 0) {
-    if (hint >= kMaxHint) {
-      // The embedder is requesting a lot of GC work after context disposal,
-      // we age inline caches so that they don't keep objects from
-      // the old context alive.
-      AgeInlineCaches();
-    }
+    contexts_disposed_ = 0;
     int mark_sweep_time = Min(TimeMarkSweepWouldTakeInMs(), 1000);
     if (hint >= mark_sweep_time && !FLAG_expose_gc &&
         incremental_marking()->IsStopped()) {
       HistogramTimerScope scope(isolate_->counters()->gc_context());
       CollectAllGarbage(kReduceMemoryFootprintMask,
                         "idle notification: contexts disposed");
     } else {
       AdvanceIdleIncrementalMarking(step_size);
-      contexts_disposed_ = 0;
     }
+
     // After context disposal there is likely a lot of garbage remaining, reset
     // the idle notification counters in order to trigger more incremental GCs
     // on subsequent idle notifications.
     StartIdleRound();
     return false;
   }
 
   if (!FLAG_incremental_marking || FLAG_expose_gc || Serializer::enabled()) {
     return IdleGlobalGC();
   }
@@ skipping 2064 matching lines @@
   if (FLAG_parallel_recompilation) {
     heap_->relocation_mutex_->Lock();
 #ifdef DEBUG
     heap_->relocation_mutex_locked_by_optimizer_thread_ =
         heap_->isolate()->optimizing_compiler_thread()->IsOptimizerThread();
 #endif  // DEBUG
   }
 }
 
 } }  // namespace v8::internal