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Issue 1376413005: Revert of [heap] Prepare code for smaller large object allocation limit than max allocatable memory. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years, 2 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_OBJECTS_H_ 5 #ifndef V8_OBJECTS_H_
6 #define V8_OBJECTS_H_ 6 #define V8_OBJECTS_H_
7 7
8 #include <iosfwd> 8 #include <iosfwd>
9 9
10 #include "src/allocation.h" 10 #include "src/allocation.h"
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2359 static const uint32_t kMaxGap = 1024; 2359 static const uint32_t kMaxGap = 1024;
2360 2360
2361 // Maximal length of fast elements array that won't be checked for 2361 // Maximal length of fast elements array that won't be checked for
2362 // being dense enough on expansion. 2362 // being dense enough on expansion.
2363 static const int kMaxUncheckedFastElementsLength = 5000; 2363 static const int kMaxUncheckedFastElementsLength = 5000;
2364 2364
2365 // Same as above but for old arrays. This limit is more strict. We 2365 // Same as above but for old arrays. This limit is more strict. We
2366 // don't want to be wasteful with long lived objects. 2366 // don't want to be wasteful with long lived objects.
2367 static const int kMaxUncheckedOldFastElementsLength = 500; 2367 static const int kMaxUncheckedOldFastElementsLength = 500;
2368 2368
2369 // Note that Page::kMaxRegularHeapObjectSize puts a limit on
2370 // permissible values (see the DCHECK in heap.cc).
2371 static const int kInitialMaxFastElementArray = 100000;
2372
2369 // This constant applies only to the initial map of "global.Object" and 2373 // This constant applies only to the initial map of "global.Object" and
2370 // not to arbitrary other JSObject maps. 2374 // not to arbitrary other JSObject maps.
2371 static const int kInitialGlobalObjectUnusedPropertiesCount = 4; 2375 static const int kInitialGlobalObjectUnusedPropertiesCount = 4;
2372 2376
2373 static const int kMaxInstanceSize = 255 * kPointerSize; 2377 static const int kMaxInstanceSize = 255 * kPointerSize;
2374 // When extending the backing storage for property values, we increase 2378 // When extending the backing storage for property values, we increase
2375 // its size by more than the 1 entry necessary, so sequentially adding fields 2379 // its size by more than the 1 entry necessary, so sequentially adding fields
2376 // to the same object requires fewer allocations and copies. 2380 // to the same object requires fewer allocations and copies.
2377 static const int kFieldsAdded = 3; 2381 static const int kFieldsAdded = 3;
2378 2382
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10025 DECLARE_PRINTER(JSArray) 10029 DECLARE_PRINTER(JSArray)
10026 DECLARE_VERIFIER(JSArray) 10030 DECLARE_VERIFIER(JSArray)
10027 10031
10028 // Number of element slots to pre-allocate for an empty array. 10032 // Number of element slots to pre-allocate for an empty array.
10029 static const int kPreallocatedArrayElements = 4; 10033 static const int kPreallocatedArrayElements = 4;
10030 10034
10031 // Layout description. 10035 // Layout description.
10032 static const int kLengthOffset = JSObject::kHeaderSize; 10036 static const int kLengthOffset = JSObject::kHeaderSize;
10033 static const int kSize = kLengthOffset + kPointerSize; 10037 static const int kSize = kLengthOffset + kPointerSize;
10034 10038
10035 // Note that Page::kMaxRegularHeapObjectSize puts a limit on
10036 // permissible values (see the DCHECK in heap.cc).
10037 static const int kInitialMaxFastElementArray = 100000;
10038
10039 private: 10039 private:
10040 DISALLOW_IMPLICIT_CONSTRUCTORS(JSArray); 10040 DISALLOW_IMPLICIT_CONSTRUCTORS(JSArray);
10041 }; 10041 };
10042 10042
10043 10043
10044 Handle<Object> CacheInitialJSArrayMaps(Handle<Context> native_context, 10044 Handle<Object> CacheInitialJSArrayMaps(Handle<Context> native_context,
10045 Handle<Map> initial_map); 10045 Handle<Map> initial_map);
10046 10046
10047 10047
10048 // JSRegExpResult is just a JSArray with a specific initial map. 10048 // JSRegExpResult is just a JSArray with a specific initial map.
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10664 Handle<FixedArray> keys_; 10664 Handle<FixedArray> keys_;
10665 Handle<OrderedHashSet> set_; 10665 Handle<OrderedHashSet> set_;
10666 int length_; 10666 int length_;
10667 DISALLOW_COPY_AND_ASSIGN(KeyAccumulator); 10667 DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
10668 }; 10668 };
10669 10669
10670 } // NOLINT, false-positive due to second-order macros. 10670 } // NOLINT, false-positive due to second-order macros.
10671 } // NOLINT, false-positive due to second-order macros. 10671 } // NOLINT, false-positive due to second-order macros.
10672 10672
10673 #endif // V8_OBJECTS_H_ 10673 #endif // V8_OBJECTS_H_
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