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Issue 12314155: Allow direct allocation in old pointer space. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 7 years, 9 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 // 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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3832 // Check for the empty array, and preallocate a small backing store if 3832 // Check for the empty array, and preallocate a small backing store if
3833 // possible. 3833 // possible.
3834 __ ldr(length_reg, 3834 __ ldr(length_reg,
3835 FieldMemOperand(receiver_reg, JSArray::kLengthOffset)); 3835 FieldMemOperand(receiver_reg, JSArray::kLengthOffset));
3836 __ ldr(elements_reg, 3836 __ ldr(elements_reg,
3837 FieldMemOperand(receiver_reg, JSObject::kElementsOffset)); 3837 FieldMemOperand(receiver_reg, JSObject::kElementsOffset));
3838 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex); 3838 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex);
3839 __ b(ne, &check_capacity); 3839 __ b(ne, &check_capacity);
3840 3840
3841 int size = FixedArray::SizeFor(JSArray::kPreallocatedArrayElements); 3841 int size = FixedArray::SizeFor(JSArray::kPreallocatedArrayElements);
3842 __ AllocateInNewSpace(size, elements_reg, scratch, scratch2, &slow, 3842 __ Allocate(size, elements_reg, scratch, scratch2, &slow, TAG_OBJECT);
3843 TAG_OBJECT);
3844 3843
3845 __ LoadRoot(scratch, Heap::kFixedArrayMapRootIndex); 3844 __ LoadRoot(scratch, Heap::kFixedArrayMapRootIndex);
3846 __ str(scratch, FieldMemOperand(elements_reg, JSObject::kMapOffset)); 3845 __ str(scratch, FieldMemOperand(elements_reg, JSObject::kMapOffset));
3847 __ mov(scratch, Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements))); 3846 __ mov(scratch, Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements)));
3848 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::kLengthOffset)); 3847 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::kLengthOffset));
3849 __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex); 3848 __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
3850 for (int i = 1; i < JSArray::kPreallocatedArrayElements; ++i) { 3849 for (int i = 1; i < JSArray::kPreallocatedArrayElements; ++i) {
3851 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::SizeFor(i))); 3850 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::SizeFor(i)));
3852 } 3851 }
3853 3852
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3986 // Check for the empty array, and preallocate a small backing store if 3985 // Check for the empty array, and preallocate a small backing store if
3987 // possible. 3986 // possible.
3988 __ ldr(length_reg, 3987 __ ldr(length_reg,
3989 FieldMemOperand(receiver_reg, JSArray::kLengthOffset)); 3988 FieldMemOperand(receiver_reg, JSArray::kLengthOffset));
3990 __ ldr(elements_reg, 3989 __ ldr(elements_reg,
3991 FieldMemOperand(receiver_reg, JSObject::kElementsOffset)); 3990 FieldMemOperand(receiver_reg, JSObject::kElementsOffset));
3992 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex); 3991 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex);
3993 __ b(ne, &check_capacity); 3992 __ b(ne, &check_capacity);
3994 3993
3995 int size = FixedDoubleArray::SizeFor(JSArray::kPreallocatedArrayElements); 3994 int size = FixedDoubleArray::SizeFor(JSArray::kPreallocatedArrayElements);
3996 __ AllocateInNewSpace(size, elements_reg, scratch1, scratch2, &slow, 3995 __ Allocate(size, elements_reg, scratch1, scratch2, &slow, TAG_OBJECT);
3997 TAG_OBJECT);
3998 3996
3999 // Initialize the new FixedDoubleArray. 3997 // Initialize the new FixedDoubleArray.
4000 __ LoadRoot(scratch1, Heap::kFixedDoubleArrayMapRootIndex); 3998 __ LoadRoot(scratch1, Heap::kFixedDoubleArrayMapRootIndex);
4001 __ str(scratch1, FieldMemOperand(elements_reg, JSObject::kMapOffset)); 3999 __ str(scratch1, FieldMemOperand(elements_reg, JSObject::kMapOffset));
4002 __ mov(scratch1, 4000 __ mov(scratch1,
4003 Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements))); 4001 Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements)));
4004 __ str(scratch1, 4002 __ str(scratch1,
4005 FieldMemOperand(elements_reg, FixedDoubleArray::kLengthOffset)); 4003 FieldMemOperand(elements_reg, FixedDoubleArray::kLengthOffset));
4006 4004
4007 __ mov(scratch1, elements_reg); 4005 __ mov(scratch1, elements_reg);
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4054 __ Jump(ic_slow, RelocInfo::CODE_TARGET); 4052 __ Jump(ic_slow, RelocInfo::CODE_TARGET);
4055 } 4053 }
4056 } 4054 }
4057 4055
4058 4056
4059 #undef __ 4057 #undef __
4060 4058
4061 } } // namespace v8::internal 4059 } } // namespace v8::internal
4062 4060
4063 #endif // V8_TARGET_ARCH_ARM 4061 #endif // V8_TARGET_ARCH_ARM
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