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Issue 66603004: Revert "[Object.observe] Don't force normalization of elements for observed objects" (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 7 years, 1 month 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 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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1425 Register elements_map = r6; 1425 Register elements_map = r6;
1426 Register elements = r9; // Elements array of the receiver. 1426 Register elements = r9; // Elements array of the receiver.
1427 // r4 and r5 are used as general scratch registers. 1427 // r4 and r5 are used as general scratch registers.
1428 1428
1429 // Check that the key is a smi. 1429 // Check that the key is a smi.
1430 __ JumpIfNotSmi(key, &slow); 1430 __ JumpIfNotSmi(key, &slow);
1431 // Check that the object isn't a smi. 1431 // Check that the object isn't a smi.
1432 __ JumpIfSmi(receiver, &slow); 1432 __ JumpIfSmi(receiver, &slow);
1433 // Get the map of the object. 1433 // Get the map of the object.
1434 __ ldr(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset)); 1434 __ ldr(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset));
1435 // Check that the receiver does not require access checks and is not observed. 1435 // Check that the receiver does not require access checks. We need
1436 // The generic stub does not perform map checks or handle observed objects. 1436 // to do this because this generic stub does not perform map checks.
1437 __ ldrb(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset)); 1437 __ ldrb(ip, FieldMemOperand(receiver_map, Map::kBitFieldOffset));
1438 __ tst(ip, Operand(1 << Map::kIsAccessCheckNeeded | 1 << Map::kIsObserved); 1438 __ tst(ip, Operand(1 << Map::kIsAccessCheckNeeded));
1439 __ b(ne, &slow); 1439 __ b(ne, &slow);
1440
1441 // Check if the object is a JS array or not. 1440 // Check if the object is a JS array or not.
1442 __ ldrb(r4, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset)); 1441 __ ldrb(r4, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset));
1443 __ cmp(r4, Operand(JS_ARRAY_TYPE)); 1442 __ cmp(r4, Operand(JS_ARRAY_TYPE));
1444 __ b(eq, &array); 1443 __ b(eq, &array);
1445 // Check that the object is some kind of JSObject. 1444 // Check that the object is some kind of JSObject.
1446 __ cmp(r4, Operand(FIRST_JS_OBJECT_TYPE)); 1445 __ cmp(r4, Operand(FIRST_JS_OBJECT_TYPE));
1447 __ b(lt, &slow); 1446 __ b(lt, &slow);
1448 1447
1449 // Object case: Check key against length in the elements array. 1448 // Object case: Check key against length in the elements array.
1450 __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); 1449 __ ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
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1683 } else { 1682 } else {
1684 ASSERT(Assembler::GetCondition(branch_instr) == ne); 1683 ASSERT(Assembler::GetCondition(branch_instr) == ne);
1685 patcher.EmitCondition(eq); 1684 patcher.EmitCondition(eq);
1686 } 1685 }
1687 } 1686 }
1688 1687
1689 1688
1690 } } // namespace v8::internal 1689 } } // namespace v8::internal
1691 1690
1692 #endif // V8_TARGET_ARCH_ARM 1691 #endif // V8_TARGET_ARCH_ARM
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