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Use a hashmap to lookup items in the partial snapshot cache when serializing.

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R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/952933002

Cr-Commit-Position: refs/heads/master@{#26839}
This commit is contained in:
yangguo 2015-02-24 23:49:18 -08:00 committed by Commit bot
parent bc483ddac4
commit c18de60248
2 changed files with 36 additions and 12 deletions
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25
src/serialize.cc
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@ -1523,19 +1523,20 @@ void SerializerDeserializer::Iterate(Isolate* isolate,
int PartialSerializer::PartialSnapshotCacheIndex(HeapObject* heap_object) {
Isolate* isolate = this->isolate();
List<Object*>* cache = isolate->partial_snapshot_cache();
for (int i = 0; i < cache->length(); ++i) {
Object* entry = cache->at(i);
if (entry == heap_object) return i;
}
int new_index = cache->length();
// We didn't find the object in the cache. So we add it to the cache and
// then visit the pointer so that it becomes part of the startup snapshot
// and we can refer to it from the partial snapshot.
cache->Add(heap_object);
startup_serializer_->VisitPointer(reinterpret_cast<Object**>(&heap_object));
// We don't recurse from the startup snapshot generator into the partial
// snapshot generator.
return cache->length() - 1;
int index = partial_cache_index_map_.LookupOrInsert(heap_object, new_index);
if (index == PartialCacheIndexMap::kInvalidIndex) {
// We didn't find the object in the cache. So we add it to the cache and
// then visit the pointer so that it becomes part of the startup snapshot
// and we can refer to it from the partial snapshot.
cache->Add(heap_object);
startup_serializer_->VisitPointer(reinterpret_cast<Object**>(&heap_object));
// We don't recurse from the startup snapshot generator into the partial
// snapshot generator.
return new_index;
}
return index;
}

23
src/serialize.h
View File

@ -186,6 +186,28 @@ class RootIndexMap : public AddressMapBase {
};
class PartialCacheIndexMap : public AddressMapBase {
public:
PartialCacheIndexMap() : map_(HashMap::PointersMatch) {}
static const int kInvalidIndex = -1;
// Lookup object in the map. Return its index if found, or create
// a new entry with new_index as value, and return kInvalidIndex.
int LookupOrInsert(HeapObject* obj, int new_index) {
HashMap::Entry* entry = LookupEntry(&map_, obj, true);
if (entry->value != NULL) return GetValue(entry);
SetValue(entry, static_cast<uint32_t>(new_index));
return kInvalidIndex;
}
private:
HashMap map_;
DISALLOW_COPY_AND_ASSIGN(PartialCacheIndexMap);
};
class BackReference {
public:
explicit BackReference(uint32_t bitfield) : bitfield_(bitfield) {}
@ -802,6 +824,7 @@ class PartialSerializer : public Serializer {
Serializer* startup_serializer_;
List<BackReference> outdated_contexts_;
Object* global_object_;
PartialCacheIndexMap partial_cache_index_map_;
DISALLOW_COPY_AND_ASSIGN(PartialSerializer);
};