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Side by Side Diff: runtime/vm/raw_object.h

Issue 2912863006: Inline instance object hash code into object header on 64 bit. (Closed)
Patch Set: Created 3 years, 6 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #ifndef RUNTIME_VM_RAW_OBJECT_H_ 5 #ifndef RUNTIME_VM_RAW_OBJECT_H_
6 #define RUNTIME_VM_RAW_OBJECT_H_ 6 #define RUNTIME_VM_RAW_OBJECT_H_
7 7
8 #include "platform/assert.h" 8 #include "platform/assert.h"
9 #include "vm/atomic.h" 9 #include "vm/atomic.h"
10 #include "vm/exceptions.h" 10 #include "vm/exceptions.h"
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264 kMarkBit = 0, 264 kMarkBit = 0,
265 kCanonicalBit = 1, 265 kCanonicalBit = 1,
266 kVMHeapObjectBit = 2, 266 kVMHeapObjectBit = 2,
267 kRememberedBit = 3, 267 kRememberedBit = 3,
268 kReservedTagPos = 4, // kReservedBit{100K,1M,10M} 268 kReservedTagPos = 4, // kReservedBit{100K,1M,10M}
269 kReservedTagSize = 4, 269 kReservedTagSize = 4,
270 kSizeTagPos = kReservedTagPos + kReservedTagSize, // = 8 270 kSizeTagPos = kReservedTagPos + kReservedTagSize, // = 8
271 kSizeTagSize = 8, 271 kSizeTagSize = 8,
272 kClassIdTagPos = kSizeTagPos + kSizeTagSize, // = 16 272 kClassIdTagPos = kSizeTagPos + kSizeTagSize, // = 16
273 kClassIdTagSize = 16, 273 kClassIdTagSize = 16,
274 #if defined(HASH_IN_OBJECT_HEADER)
275 kHashTagPos = kClassIdTagPos + kClassIdTagSize, // = 32
276 kHashTagSize = 16,
277 #endif
274 }; 278 };
275 279
276 COMPILE_ASSERT(kClassIdTagSize == (sizeof(classid_t) * kBitsPerByte)); 280 COMPILE_ASSERT(kClassIdTagSize == (sizeof(classid_t) * kBitsPerByte));
277 281
278 // Encodes the object size in the tag in units of object alignment. 282 // Encodes the object size in the tag in units of object alignment.
279 class SizeTag { 283 class SizeTag {
280 public: 284 public:
281 static const intptr_t kMaxSizeTag = ((1 << RawObject::kSizeTagSize) - 1) 285 static const intptr_t kMaxSizeTag = ((1 << RawObject::kSizeTagSize) - 1)
282 << kObjectAlignmentLog2; 286 << kObjectAlignmentLog2;
283 287
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2451 kTypedDataInt8ArrayViewCid + 15); 2455 kTypedDataInt8ArrayViewCid + 15);
2452 COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14); 2456 COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
2453 COMPILE_ASSERT(kNullCid == kByteBufferCid + 1); 2457 COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
2454 return (kNullCid - kTypedDataInt8ArrayCid); 2458 return (kNullCid - kTypedDataInt8ArrayCid);
2455 } 2459 }
2456 2460
2457 2461
2458 } // namespace dart 2462 } // namespace dart
2459 2463
2460 #endif // RUNTIME_VM_RAW_OBJECT_H_ 2464 #endif // RUNTIME_VM_RAW_OBJECT_H_
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