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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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75 | 75 |
76 // Find the length of the large object (FixedArray). | 76 // Find the length of the large object (FixedArray). |
77 masm->mov(scratch, Operand(page_start, Page::kObjectStartOffset | 77 masm->mov(scratch, Operand(page_start, Page::kObjectStartOffset |
78 + FixedArray::kLengthOffset)); | 78 + FixedArray::kLengthOffset)); |
79 Register array_length = scratch; | 79 Register array_length = scratch; |
80 | 80 |
81 // Extra remembered set starts right after the large object (a FixedArray), at | 81 // Extra remembered set starts right after the large object (a FixedArray), at |
82 // page_start + kObjectStartOffset + objectSize | 82 // page_start + kObjectStartOffset + objectSize |
83 // where objectSize is FixedArray::kHeaderSize + kPointerSize * array_length. | 83 // where objectSize is FixedArray::kHeaderSize + kPointerSize * array_length. |
84 // Add the delta between the end of the normal RSet and the start of the | 84 // Add the delta between the end of the normal RSet and the start of the |
85 // extra RSet to 'object', so that addressing the bit using 'pointer_offset' | 85 // extra RSet to 'page_start', so that addressing the bit using |
86 // hits the extra RSet words. | 86 // 'pointer_offset' hits the extra RSet words. |
87 masm->lea(page_start, | 87 masm->lea(page_start, |
88 Operand(page_start, array_length, times_pointer_size, | 88 Operand(page_start, array_length, times_pointer_size, |
89 Page::kObjectStartOffset + FixedArray::kHeaderSize | 89 Page::kObjectStartOffset + FixedArray::kHeaderSize |
90 - Page::kRSetEndOffset)); | 90 - Page::kRSetEndOffset)); |
91 | 91 |
92 // NOTE: For now, we use the bit-test-and-set (bts) x86 instruction | 92 // NOTE: For now, we use the bit-test-and-set (bts) x86 instruction |
93 // to limit code size. We should probably evaluate this decision by | 93 // to limit code size. We should probably evaluate this decision by |
94 // measuring the performance of an equivalent implementation using | 94 // measuring the performance of an equivalent implementation using |
95 // "simpler" instructions | 95 // "simpler" instructions |
96 masm->bind(&fast); | 96 masm->bind(&fast); |
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1035 // Indicate that code has changed. | 1035 // Indicate that code has changed. |
1036 CPU::FlushICache(address_, size_); | 1036 CPU::FlushICache(address_, size_); |
1037 | 1037 |
1038 // Check that the code was patched as expected. | 1038 // Check that the code was patched as expected. |
1039 ASSERT(masm_.pc_ == address_ + size_); | 1039 ASSERT(masm_.pc_ == address_ + size_); |
1040 ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap); | 1040 ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap); |
1041 } | 1041 } |
1042 | 1042 |
1043 | 1043 |
1044 } } // namespace v8::internal | 1044 } } // namespace v8::internal |
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