Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(561)

Unified Diff: src/objects.h

Issue 3032028: Cache maps for slow case objects. (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 10 years, 5 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « src/heap.cc ('k') | src/objects.cc » ('j') | src/objects.cc » ('J')
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: src/objects.h
===================================================================
--- src/objects.h (revision 5141)
+++ src/objects.h (working copy)
@@ -631,6 +631,7 @@
inline bool IsDictionary();
inline bool IsSymbolTable();
inline bool IsJSFunctionResultCache();
+ inline bool IsNormalizedMapCache();
inline bool IsCompilationCacheTable();
inline bool IsCodeCacheHashTable();
inline bool IsMapCache();
@@ -2387,6 +2388,31 @@
};
+// The cache for maps used by normalized (dictionary mode) objects.
+// Such maps do not have property descriptors, so a typical program
+// needs very limited number of distinct normalized maps.
+class NormalizedMapCache: public FixedArray {
+ public:
+ static const int kEntries = 256;
+
+ Object* Get(Map* fast, PropertyNormalizationMode mode);
+
+ void Clear();
+
+ // Casting
+ static inline NormalizedMapCache* cast(Object* obj);
+
+#ifdef DEBUG
+ void NormalizedMapCacheVerify();
+#endif
+
+ private:
+ static int Hash(Map* fast);
+
+ static bool CheckHit(Map* slow, Map* fast, PropertyNormalizationMode mode);
+};
+
+
// ByteArray represents fixed sized byte arrays. Used by the outside world,
// such as PCRE, and also by the memory allocator and garbage collector to
// fill in free blocks in the heap.
@@ -3030,6 +3056,8 @@
Object* CopyDropDescriptors();
+ Object* CopyNormalized(PropertyNormalizationMode mode);
+
// Returns a copy of the map, with all transitions dropped from the
// instance descriptors.
Object* CopyDropTransitions();
@@ -3093,6 +3121,7 @@
#ifdef DEBUG
void MapPrint();
void MapVerify();
+ void NormalizedMapVerify();
#endif
inline Scavenger scavenger();
@@ -3131,6 +3160,8 @@
static const int kPreAllocatedPropertyFieldsOffset =
kInstanceSizesOffset + kPreAllocatedPropertyFieldsByte;
// The byte at position 3 is not in use at the moment.
+ static const int kUnusedByte = 3;
+ static const int kUnusedOffset = kInstanceSizesOffset + kUnusedByte;
// Byte offsets within kInstanceAttributesOffset attributes.
static const int kInstanceTypeOffset = kInstanceAttributesOffset + 0;
« no previous file with comments | « src/heap.cc ('k') | src/objects.cc » ('j') | src/objects.cc » ('J')

Powered by Google App Engine
This is Rietveld 408576698