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Issue 9073007: Store transitioned JSArray maps in global context (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: review feedback Created 8 years, 11 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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107 // and filled with the hole values. 107 // and filled with the hole values.
108 static void AllocateEmptyJSArray(MacroAssembler* masm, 108 static void AllocateEmptyJSArray(MacroAssembler* masm,
109 Register array_function, 109 Register array_function,
110 Register result, 110 Register result,
111 Register scratch1, 111 Register scratch1,
112 Register scratch2, 112 Register scratch2,
113 Register scratch3, 113 Register scratch3,
114 Label* gc_required) { 114 Label* gc_required) {
115 const int initial_capacity = JSArray::kPreallocatedArrayElements; 115 const int initial_capacity = JSArray::kPreallocatedArrayElements;
116 STATIC_ASSERT(initial_capacity >= 0); 116 STATIC_ASSERT(initial_capacity >= 0);
117 // Load the initial map from the array function. 117 __ LoadGlobalInitialConstructedArrayMap(array_function, scratch2, scratch1);
118 __ ldr(scratch1, FieldMemOperand(array_function,
119 JSFunction::kPrototypeOrInitialMapOffset));
120 118
121 // Allocate the JSArray object together with space for a fixed array with the 119 // Allocate the JSArray object together with space for a fixed array with the
122 // requested elements. 120 // requested elements.
123 int size = JSArray::kSize; 121 int size = JSArray::kSize;
124 if (initial_capacity > 0) { 122 if (initial_capacity > 0) {
125 size += FixedArray::SizeFor(initial_capacity); 123 size += FixedArray::SizeFor(initial_capacity);
126 } 124 }
127 __ AllocateInNewSpace(size, 125 __ AllocateInNewSpace(size,
128 result, 126 result,
129 scratch2, 127 scratch2,
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203 Register array_function, // Array function. 201 Register array_function, // Array function.
204 Register array_size, // As a smi, cannot be 0. 202 Register array_size, // As a smi, cannot be 0.
205 Register result, 203 Register result,
206 Register elements_array_storage, 204 Register elements_array_storage,
207 Register elements_array_end, 205 Register elements_array_end,
208 Register scratch1, 206 Register scratch1,
209 Register scratch2, 207 Register scratch2,
210 bool fill_with_hole, 208 bool fill_with_hole,
211 Label* gc_required) { 209 Label* gc_required) {
212 // Load the initial map from the array function. 210 // Load the initial map from the array function.
213 __ ldr(elements_array_storage, 211 __ LoadGlobalInitialConstructedArrayMap(array_function, scratch2,
214 FieldMemOperand(array_function, 212 elements_array_storage);
215 JSFunction::kPrototypeOrInitialMapOffset));
216 213
217 if (FLAG_debug_code) { // Assert that array size is not zero. 214 if (FLAG_debug_code) { // Assert that array size is not zero.
218 __ tst(array_size, array_size); 215 __ tst(array_size, array_size);
219 __ Assert(ne, "array size is unexpectedly 0"); 216 __ Assert(ne, "array size is unexpectedly 0");
220 } 217 }
221 218
222 // Allocate the JSArray object together with space for a FixedArray with the 219 // Allocate the JSArray object together with space for a FixedArray with the
223 // requested number of elements. 220 // requested number of elements.
224 STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0); 221 STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
225 __ mov(elements_array_end, 222 __ mov(elements_array_end,
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1771 __ bind(&dont_adapt_arguments); 1768 __ bind(&dont_adapt_arguments);
1772 __ Jump(r3); 1769 __ Jump(r3);
1773 } 1770 }
1774 1771
1775 1772
1776 #undef __ 1773 #undef __
1777 1774
1778 } } // namespace v8::internal 1775 } } // namespace v8::internal
1779 1776
1780 #endif // V8_TARGET_ARCH_ARM 1777 #endif // V8_TARGET_ARCH_ARM
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