-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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:
// Forward declarations.
class CodeFlusher;
class GCTracer;
+class MarkCompactCollector;
class MarkingVisitor;
class RootMarkingVisitor;
// ----------------------------------------------------------------------------
// Marking deque for tracing live objects.
-
class MarkingDeque {
public:
MarkingDeque()
ASSERT(object->IsHeapObject());
if (IsFull()) {
Marking::BlackToGrey(object);
- MemoryChunk::IncrementLiveBytes(object->address(), -object->Size());
+ MemoryChunk::IncrementLiveBytesFromGC(object->address(), -object->Size());
SetOverflowed();
} else {
array_[top_] = object;
static const int kNumberOfElements = 1021;
private:
- static const int kChainLengthThreshold = 6;
+ static const int kChainLengthThreshold = 15;
intptr_t idx_;
intptr_t chain_length_;
// -------------------------------------------------------------------------
+// Marker shared between incremental and non-incremental marking
+template<class BaseMarker> class Marker {
+ public:
+ Marker(BaseMarker* base_marker, MarkCompactCollector* mark_compact_collector)
+ : base_marker_(base_marker),
+ mark_compact_collector_(mark_compact_collector) {}
+
+ // Mark pointers in a Map and its DescriptorArray together, possibly
+ // treating transitions or back pointers weak.
+ void MarkMapContents(Map* map);
+ void MarkDescriptorArray(DescriptorArray* descriptors);
+ void MarkAccessorPairSlot(AccessorPair* accessors, int offset);
+
+ private:
+ BaseMarker* base_marker() {
+ return base_marker_;
+ }
+
+ MarkCompactCollector* mark_compact_collector() {
+ return mark_compact_collector_;
+ }
+
+ BaseMarker* base_marker_;
+ MarkCompactCollector* mark_compact_collector_;
+};
+
+
+// Defined in isolate.h.
+class ThreadLocalTop;
+
+
+// -------------------------------------------------------------------------
// Mark-Compact collector
class MarkCompactCollector {
public:
// object from the forwarding address of the previous live object in the
// page as input, and is updated to contain the offset to be used for the
// next live object in the same page. For spaces using a different
- // encoding (ie, contiguous spaces), the offset parameter is ignored.
+ // encoding (i.e., contiguous spaces), the offset parameter is ignored.
typedef void (*EncodingFunction)(Heap* heap,
HeapObject* old_object,
int object_size,
// Pointer to member function, used in IterateLiveObjects.
typedef int (MarkCompactCollector::*LiveObjectCallback)(HeapObject* obj);
- // Set the global force_compaction flag, it must be called before Prepare
- // to take effect.
+ // Set the global flags, it must be called before Prepare to take effect.
inline void SetFlags(int flags);
- inline bool PreciseSweepingRequired() {
- return sweep_precisely_;
- }
-
static void Initialize();
void CollectEvacuationCandidates(PagedSpace* space);
// Performs a global garbage collection.
void CollectGarbage();
- bool StartCompaction();
+ enum CompactionMode {
+ INCREMENTAL_COMPACTION,
+ NON_INCREMENTAL_COMPACTION
+ };
+
+ bool StartCompaction(CompactionMode mode);
void AbortCompaction();
void ClearMarkbits();
+ bool is_compacting() const { return compacting_; }
+
private:
MarkCompactCollector();
~MarkCompactCollector();
// heap.
bool sweep_precisely_;
+ bool reduce_memory_footprint_;
+
+ bool abort_incremental_marking_;
+
// True if we are collecting slots to perform evacuation from evacuation
// candidates.
bool compacting_;
bool was_marked_incrementally_;
- bool collect_maps_;
+ bool flush_monomorphic_ics_;
// A pointer to the current stack-allocated GC tracer object during a full
// collection (NULL before and after).
//
// After: Live objects are marked and non-live objects are unmarked.
-
friend class RootMarkingVisitor;
friend class MarkingVisitor;
friend class StaticMarkingVisitor;
friend class CodeMarkingVisitor;
friend class SharedFunctionInfoMarkingVisitor;
+ friend class Marker<IncrementalMarking>;
+ friend class Marker<MarkCompactCollector>;
+
+ // Mark non-optimize code for functions inlined into the given optimized
+ // code. This will prevent it from being flushed.
+ void MarkInlinedFunctionsCode(Code* code);
+
+ // Mark code objects that are active on the stack to prevent them
+ // from being flushed.
+ void PrepareThreadForCodeFlushing(Isolate* isolate, ThreadLocalTop* top);
void PrepareForCodeFlushing();
void AfterMarking();
+ // Marks the object black and pushes it on the marking stack.
+ // Returns true if object needed marking and false otherwise.
+ // This is for non-incremental marking only.
+ INLINE(bool MarkObjectAndPush(HeapObject* obj));
+
+ // Marks the object black and pushes it on the marking stack.
+ // This is for non-incremental marking only.
INLINE(void MarkObject(HeapObject* obj, MarkBit mark_bit));
+ // Marks the object black without pushing it on the marking stack.
+ // Returns true if object needed marking and false otherwise.
+ // This is for non-incremental marking only.
+ INLINE(bool MarkObjectWithoutPush(HeapObject* obj));
+
+ // Marks the object black assuming that it is not yet marked.
+ // This is for non-incremental marking only.
INLINE(void SetMark(HeapObject* obj, MarkBit mark_bit));
void ProcessNewlyMarkedObject(HeapObject* obj);
- // Creates back pointers for all map transitions, stores them in
- // the prototype field. The original prototype pointers are restored
- // in ClearNonLiveTransitions(). All JSObject maps
- // connected by map transitions have the same prototype object, which
- // is why we can use this field temporarily for back pointers.
- void CreateBackPointers();
-
- // Mark a Map and its DescriptorArray together, skipping transitions.
- void MarkMapContents(Map* map);
- void MarkDescriptorArray(DescriptorArray* descriptors);
-
// Mark the heap roots and all objects reachable from them.
void MarkRoots(RootMarkingVisitor* visitor);
// Map transitions from a live map to a dead map must be killed.
// We replace them with a null descriptor, with the same key.
void ClearNonLiveTransitions();
+ void ClearNonLivePrototypeTransitions(Map* map);
+ void ClearNonLiveMapTransitions(Map* map, MarkBit map_mark);
// Marking detaches initial maps from SharedFunctionInfo objects
// to make this reference weak. We need to reattach initial maps
MarkingDeque marking_deque_;
CodeFlusher* code_flusher_;
Object* encountered_weak_maps_;
+ Marker<MarkCompactCollector> marker_;
List<Page*> evacuation_candidates_;
List<Code*> invalidated_code_;
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