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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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3826 // Check for the empty array, and preallocate a small backing store if 3826 // Check for the empty array, and preallocate a small backing store if
3827 // possible. 3827 // possible.
3828 __ ldr(length_reg, 3828 __ ldr(length_reg,
3829 FieldMemOperand(receiver_reg, JSArray::kLengthOffset)); 3829 FieldMemOperand(receiver_reg, JSArray::kLengthOffset));
3830 __ ldr(elements_reg, 3830 __ ldr(elements_reg,
3831 FieldMemOperand(receiver_reg, JSObject::kElementsOffset)); 3831 FieldMemOperand(receiver_reg, JSObject::kElementsOffset));
3832 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex); 3832 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex);
3833 __ b(ne, &check_capacity); 3833 __ b(ne, &check_capacity);
3834 3834
3835 int size = FixedArray::SizeFor(JSArray::kPreallocatedArrayElements); 3835 int size = FixedArray::SizeFor(JSArray::kPreallocatedArrayElements);
3836 __ AllocateInNewSpace(size, elements_reg, scratch, scratch2, &slow, 3836 __ Allocate(size, elements_reg, scratch, scratch2, &slow, TAG_OBJECT);
3837 TAG_OBJECT);
3838 3837
3839 __ LoadRoot(scratch, Heap::kFixedArrayMapRootIndex); 3838 __ LoadRoot(scratch, Heap::kFixedArrayMapRootIndex);
3840 __ str(scratch, FieldMemOperand(elements_reg, JSObject::kMapOffset)); 3839 __ str(scratch, FieldMemOperand(elements_reg, JSObject::kMapOffset));
3841 __ mov(scratch, Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements))); 3840 __ mov(scratch, Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements)));
3842 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::kLengthOffset)); 3841 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::kLengthOffset));
3843 __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex); 3842 __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
3844 for (int i = 1; i < JSArray::kPreallocatedArrayElements; ++i) { 3843 for (int i = 1; i < JSArray::kPreallocatedArrayElements; ++i) {
3845 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::SizeFor(i))); 3844 __ str(scratch, FieldMemOperand(elements_reg, FixedArray::SizeFor(i)));
3846 } 3845 }
3847 3846
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3980 // Check for the empty array, and preallocate a small backing store if 3979 // Check for the empty array, and preallocate a small backing store if
3981 // possible. 3980 // possible.
3982 __ ldr(length_reg, 3981 __ ldr(length_reg,
3983 FieldMemOperand(receiver_reg, JSArray::kLengthOffset)); 3982 FieldMemOperand(receiver_reg, JSArray::kLengthOffset));
3984 __ ldr(elements_reg, 3983 __ ldr(elements_reg,
3985 FieldMemOperand(receiver_reg, JSObject::kElementsOffset)); 3984 FieldMemOperand(receiver_reg, JSObject::kElementsOffset));
3986 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex); 3985 __ CompareRoot(elements_reg, Heap::kEmptyFixedArrayRootIndex);
3987 __ b(ne, &check_capacity); 3986 __ b(ne, &check_capacity);
3988 3987
3989 int size = FixedDoubleArray::SizeFor(JSArray::kPreallocatedArrayElements); 3988 int size = FixedDoubleArray::SizeFor(JSArray::kPreallocatedArrayElements);
3990 __ AllocateInNewSpace(size, elements_reg, scratch1, scratch2, &slow, 3989 __ Allocate(size, elements_reg, scratch1, scratch2, &slow, TAG_OBJECT);
3991 TAG_OBJECT);
3992 3990
3993 // Initialize the new FixedDoubleArray. 3991 // Initialize the new FixedDoubleArray.
3994 __ LoadRoot(scratch1, Heap::kFixedDoubleArrayMapRootIndex); 3992 __ LoadRoot(scratch1, Heap::kFixedDoubleArrayMapRootIndex);
3995 __ str(scratch1, FieldMemOperand(elements_reg, JSObject::kMapOffset)); 3993 __ str(scratch1, FieldMemOperand(elements_reg, JSObject::kMapOffset));
3996 __ mov(scratch1, 3994 __ mov(scratch1,
3997 Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements))); 3995 Operand(Smi::FromInt(JSArray::kPreallocatedArrayElements)));
3998 __ str(scratch1, 3996 __ str(scratch1,
3999 FieldMemOperand(elements_reg, FixedDoubleArray::kLengthOffset)); 3997 FieldMemOperand(elements_reg, FixedDoubleArray::kLengthOffset));
4000 3998
4001 __ mov(scratch1, elements_reg); 3999 __ mov(scratch1, elements_reg);
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4048 __ Jump(ic_slow, RelocInfo::CODE_TARGET); 4046 __ Jump(ic_slow, RelocInfo::CODE_TARGET);
4049 } 4047 }
4050 } 4048 }
4051 4049
4052 4050
4053 #undef __ 4051 #undef __
4054 4052
4055 } } // namespace v8::internal 4053 } } // namespace v8::internal
4056 4054
4057 #endif // V8_TARGET_ARCH_ARM 4055 #endif // V8_TARGET_ARCH_ARM
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