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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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5076 __ lbu(a0, FieldMemOperand(a0, Map::kInstanceTypeOffset)); | 5076 __ lbu(a0, FieldMemOperand(a0, Map::kInstanceTypeOffset)); |
5077 STATIC_ASSERT(kSeqStringTag == 0); | 5077 STATIC_ASSERT(kSeqStringTag == 0); |
5078 __ And(at, a0, Operand(kStringRepresentationMask)); | 5078 __ And(at, a0, Operand(kStringRepresentationMask)); |
5079 __ Branch(&external_string, ne, at, Operand(zero_reg)); | 5079 __ Branch(&external_string, ne, at, Operand(zero_reg)); |
5080 | 5080 |
5081 __ bind(&seq_string); | 5081 __ bind(&seq_string); |
5082 // subject: Subject string | 5082 // subject: Subject string |
5083 // regexp_data: RegExp data (FixedArray) | 5083 // regexp_data: RegExp data (FixedArray) |
5084 // a0: Instance type of subject string | 5084 // a0: Instance type of subject string |
5085 STATIC_ASSERT(kStringEncodingMask == 4); | 5085 STATIC_ASSERT(kStringEncodingMask == 4); |
5086 STATIC_ASSERT(kAsciiStringTag == 4); | 5086 STATIC_ASSERT(kOneByteStringTag == 4); |
5087 STATIC_ASSERT(kTwoByteStringTag == 0); | 5087 STATIC_ASSERT(kTwoByteStringTag == 0); |
5088 // Find the code object based on the assumptions above. | 5088 // Find the code object based on the assumptions above. |
5089 __ And(a0, a0, Operand(kStringEncodingMask)); // Non-zero for ASCII. | 5089 __ And(a0, a0, Operand(kStringEncodingMask)); // Non-zero for ASCII. |
5090 __ lw(t9, FieldMemOperand(regexp_data, JSRegExp::kDataAsciiCodeOffset)); | 5090 __ lw(t9, FieldMemOperand(regexp_data, JSRegExp::kDataAsciiCodeOffset)); |
5091 __ sra(a3, a0, 2); // a3 is 1 for ASCII, 0 for UC16 (used below). | 5091 __ sra(a3, a0, 2); // a3 is 1 for ASCII, 0 for UC16 (used below). |
5092 __ lw(t1, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset)); | 5092 __ lw(t1, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset)); |
5093 __ Movz(t9, t1, a0); // If UC16 (a0 is 0), replace t9 w/kDataUC16CodeOffset. | 5093 __ Movz(t9, t1, a0); // If UC16 (a0 is 0), replace t9 w/kDataUC16CodeOffset. |
5094 | 5094 |
5095 // Check that the irregexp code has been generated for the actual string | 5095 // Check that the irregexp code has been generated for the actual string |
5096 // encoding. If it has, the field contains a code object otherwise it contains | 5096 // encoding. If it has, the field contains a code object otherwise it contains |
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6243 // a2: length | 6243 // a2: length |
6244 // a3: adjusted start index (untagged) | 6244 // a3: adjusted start index (untagged) |
6245 // Short slice. Copy instead of slicing. | 6245 // Short slice. Copy instead of slicing. |
6246 __ Branch(©_routine, lt, a2, Operand(SlicedString::kMinLength)); | 6246 __ Branch(©_routine, lt, a2, Operand(SlicedString::kMinLength)); |
6247 // Allocate new sliced string. At this point we do not reload the instance | 6247 // Allocate new sliced string. At this point we do not reload the instance |
6248 // type including the string encoding because we simply rely on the info | 6248 // type including the string encoding because we simply rely on the info |
6249 // provided by the original string. It does not matter if the original | 6249 // provided by the original string. It does not matter if the original |
6250 // string's encoding is wrong because we always have to recheck encoding of | 6250 // string's encoding is wrong because we always have to recheck encoding of |
6251 // the newly created string's parent anyways due to externalized strings. | 6251 // the newly created string's parent anyways due to externalized strings. |
6252 Label two_byte_slice, set_slice_header; | 6252 Label two_byte_slice, set_slice_header; |
6253 STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0); | 6253 STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); |
6254 STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); | 6254 STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); |
6255 __ And(t0, a1, Operand(kStringEncodingMask)); | 6255 __ And(t0, a1, Operand(kStringEncodingMask)); |
6256 __ Branch(&two_byte_slice, eq, t0, Operand(zero_reg)); | 6256 __ Branch(&two_byte_slice, eq, t0, Operand(zero_reg)); |
6257 __ AllocateAsciiSlicedString(v0, a2, t2, t3, &runtime); | 6257 __ AllocateAsciiSlicedString(v0, a2, t2, t3, &runtime); |
6258 __ jmp(&set_slice_header); | 6258 __ jmp(&set_slice_header); |
6259 __ bind(&two_byte_slice); | 6259 __ bind(&two_byte_slice); |
6260 __ AllocateTwoByteSlicedString(v0, a2, t2, t3, &runtime); | 6260 __ AllocateTwoByteSlicedString(v0, a2, t2, t3, &runtime); |
6261 __ bind(&set_slice_header); | 6261 __ bind(&set_slice_header); |
6262 __ sll(a3, a3, 1); | 6262 __ sll(a3, a3, 1); |
6263 __ sw(t1, FieldMemOperand(v0, SlicedString::kParentOffset)); | 6263 __ sw(t1, FieldMemOperand(v0, SlicedString::kParentOffset)); |
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6286 // t1 already points to the first character of underlying string. | 6286 // t1 already points to the first character of underlying string. |
6287 __ jmp(&allocate_result); | 6287 __ jmp(&allocate_result); |
6288 | 6288 |
6289 __ bind(&sequential_string); | 6289 __ bind(&sequential_string); |
6290 // Locate first character of underlying subject string. | 6290 // Locate first character of underlying subject string. |
6291 STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize); | 6291 STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize); |
6292 __ Addu(t1, t1, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag)); | 6292 __ Addu(t1, t1, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
6293 | 6293 |
6294 __ bind(&allocate_result); | 6294 __ bind(&allocate_result); |
6295 // Sequential acii string. Allocate the result. | 6295 // Sequential acii string. Allocate the result. |
6296 STATIC_ASSERT((kAsciiStringTag & kStringEncodingMask) != 0); | 6296 STATIC_ASSERT((kOneByteStringTag & kStringEncodingMask) != 0); |
6297 __ And(t0, a1, Operand(kStringEncodingMask)); | 6297 __ And(t0, a1, Operand(kStringEncodingMask)); |
6298 __ Branch(&two_byte_sequential, eq, t0, Operand(zero_reg)); | 6298 __ Branch(&two_byte_sequential, eq, t0, Operand(zero_reg)); |
6299 | 6299 |
6300 // Allocate and copy the resulting ASCII string. | 6300 // Allocate and copy the resulting ASCII string. |
6301 __ AllocateAsciiString(v0, a2, t0, t2, t3, &runtime); | 6301 __ AllocateAsciiString(v0, a2, t0, t2, t3, &runtime); |
6302 | 6302 |
6303 // Locate first character of substring to copy. | 6303 // Locate first character of substring to copy. |
6304 __ Addu(t1, t1, a3); | 6304 __ Addu(t1, t1, a3); |
6305 | 6305 |
6306 // Locate first character of result. | 6306 // Locate first character of result. |
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6658 // At least one of the strings is two-byte. Check whether it happens | 6658 // At least one of the strings is two-byte. Check whether it happens |
6659 // to contain only ASCII characters. | 6659 // to contain only ASCII characters. |
6660 // t0: first instance type. | 6660 // t0: first instance type. |
6661 // t1: second instance type. | 6661 // t1: second instance type. |
6662 // Branch to if _both_ instances have kAsciiDataHintMask set. | 6662 // Branch to if _both_ instances have kAsciiDataHintMask set. |
6663 __ And(at, t0, Operand(kAsciiDataHintMask)); | 6663 __ And(at, t0, Operand(kAsciiDataHintMask)); |
6664 __ and_(at, at, t1); | 6664 __ and_(at, at, t1); |
6665 __ Branch(&ascii_data, ne, at, Operand(zero_reg)); | 6665 __ Branch(&ascii_data, ne, at, Operand(zero_reg)); |
6666 | 6666 |
6667 __ xor_(t0, t0, t1); | 6667 __ xor_(t0, t0, t1); |
6668 STATIC_ASSERT(kAsciiStringTag != 0 && kAsciiDataHintTag != 0); | 6668 STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0); |
6669 __ And(t0, t0, Operand(kAsciiStringTag | kAsciiDataHintTag)); | 6669 __ And(t0, t0, Operand(kOneByteStringTag | kAsciiDataHintTag)); |
6670 __ Branch(&ascii_data, eq, t0, Operand(kAsciiStringTag | kAsciiDataHintTag)); | 6670 __ Branch( |
| 6671 &ascii_data, eq, t0, Operand(kOneByteStringTag | kAsciiDataHintTag)); |
6671 | 6672 |
6672 // Allocate a two byte cons string. | 6673 // Allocate a two byte cons string. |
6673 __ AllocateTwoByteConsString(v0, t2, t0, t1, &call_runtime); | 6674 __ AllocateTwoByteConsString(v0, t2, t0, t1, &call_runtime); |
6674 __ Branch(&allocated); | 6675 __ Branch(&allocated); |
6675 | 6676 |
6676 // We cannot encounter sliced strings or cons strings here since: | 6677 // We cannot encounter sliced strings or cons strings here since: |
6677 STATIC_ASSERT(SlicedString::kMinLength >= ConsString::kMinLength); | 6678 STATIC_ASSERT(SlicedString::kMinLength >= ConsString::kMinLength); |
6678 // Handle creating a flat result from either external or sequential strings. | 6679 // Handle creating a flat result from either external or sequential strings. |
6679 // Locate the first characters' locations. | 6680 // Locate the first characters' locations. |
6680 // a0: first string | 6681 // a0: first string |
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7834 __ Pop(ra, t1, a1); | 7835 __ Pop(ra, t1, a1); |
7835 __ Ret(); | 7836 __ Ret(); |
7836 } | 7837 } |
7837 | 7838 |
7838 | 7839 |
7839 #undef __ | 7840 #undef __ |
7840 | 7841 |
7841 } } // namespace v8::internal | 7842 } } // namespace v8::internal |
7842 | 7843 |
7843 #endif // V8_TARGET_ARCH_MIPS | 7844 #endif // V8_TARGET_ARCH_MIPS |
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