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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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| 2990 __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset)); | 2990 __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 2991 __ movzx_b(edi, FieldOperand(edx, Map::kInstanceTypeOffset)); | 2991 __ movzx_b(edi, FieldOperand(edx, Map::kInstanceTypeOffset)); |
| 2992 // We don't handle non-strings. | 2992 // We don't handle non-strings. |
| 2993 __ test(edi, Immediate(kIsNotStringMask)); | 2993 __ test(edi, Immediate(kIsNotStringMask)); |
| 2994 __ j(not_zero, &slow_case, not_taken); | 2994 __ j(not_zero, &slow_case, not_taken); |
| 2995 | 2995 |
| 2996 // Here we make assumptions about the tag values and the shifts needed. | 2996 // Here we make assumptions about the tag values and the shifts needed. |
| 2997 // See the comment in objects.h. | 2997 // See the comment in objects.h. |
| 2998 ASSERT(kLongStringTag == 0); | 2998 ASSERT(kLongStringTag == 0); |
| 2999 ASSERT(kMediumStringTag + String::kLongLengthShift == | 2999 ASSERT(kMediumStringTag + String::kLongLengthShift == |
| 3000 String::kMediumLengthShift); | 3000 String::kMediumLengthShift); |
| 3001 ASSERT(kShortStringTag + String::kLongLengthShift == | 3001 ASSERT(kShortStringTag + String::kLongLengthShift == |
| 3002 String::kShortLengthShift); | 3002 String::kShortLengthShift); |
| 3003 __ mov(ecx, Operand(edi)); | 3003 __ mov(ecx, Operand(edi)); |
| 3004 __ and_(ecx, kStringSizeMask); | 3004 __ and_(ecx, kStringSizeMask); |
| 3005 __ add(Operand(ecx), Immediate(String::kLongLengthShift)); | 3005 __ add(Operand(ecx), Immediate(String::kLongLengthShift)); |
| 3006 // Get the length field. | 3006 // Get the length field. |
| 3007 __ mov(edx, FieldOperand(eax, String::kLengthOffset)); | 3007 __ mov(edx, FieldOperand(eax, String::kLengthOffset)); |
| 3008 __ shr(edx); // ecx is implicit operand. | 3008 __ shr(edx); // ecx is implicit operand. |
| 3009 // edx is now the length of the string. | 3009 // edx is now the length of the string. |
| 3010 | 3010 |
| 3011 // Check for index out of range. | 3011 // Check for index out of range. |
| 3012 __ cmp(ebx, Operand(edx)); | 3012 __ cmp(ebx, Operand(edx)); |
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| 5331 | 5331 |
| 5332 // Slow-case: Go through the JavaScript implementation. | 5332 // Slow-case: Go through the JavaScript implementation. |
| 5333 __ bind(&slow); | 5333 __ bind(&slow); |
| 5334 __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION); | 5334 __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION); |
| 5335 } | 5335 } |
| 5336 | 5336 |
| 5337 | 5337 |
| 5338 #undef __ | 5338 #undef __ |
| 5339 | 5339 |
| 5340 } } // namespace v8::internal | 5340 } } // namespace v8::internal |
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