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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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6500 __ pop(ecx); | 6500 __ pop(ecx); |
6501 __ pop(eax); | 6501 __ pop(eax); |
6502 __ pop(edx); | 6502 __ pop(edx); |
6503 __ push(ecx); | 6503 __ push(ecx); |
6504 | 6504 |
6505 // Do a tail call to the rewritten stub. | 6505 // Do a tail call to the rewritten stub. |
6506 __ jmp(Operand(edi)); | 6506 __ jmp(Operand(edi)); |
6507 } | 6507 } |
6508 | 6508 |
6509 | 6509 |
| 6510 // Loads a indexed element from a pixel array. |
| 6511 void GenerateFastPixelArrayLoad(MacroAssembler* masm, |
| 6512 Register receiver, |
| 6513 Register key, |
| 6514 Register elements, |
| 6515 Register untagged_key, |
| 6516 Register result, |
| 6517 Label* not_pixel_array, |
| 6518 Label* key_not_smi, |
| 6519 Label* out_of_range) { |
| 6520 // Register use: |
| 6521 // receiver - holds the receiver and is unchanged. |
| 6522 // key - holds the key and is unchanged (must be a smi). |
| 6523 // elements - is set to the the receiver's element if |
| 6524 // the receiver doesn't have a pixel array or the |
| 6525 // key is not a smi, otherwise it's the elements' |
| 6526 // external pointer. |
| 6527 // untagged_key - is set to the untagged key |
| 6528 |
| 6529 // Some callers already have verified that the key is a smi. key_not_smi is |
| 6530 // set to NULL as a sentinel for that case. Otherwise, add an explicit check |
| 6531 // to ensure the key is a smi must be added. |
| 6532 if (key_not_smi != NULL) { |
| 6533 __ JumpIfNotSmi(key, key_not_smi); |
| 6534 } else { |
| 6535 if (FLAG_debug_code) { |
| 6536 __ AbortIfNotSmi(key); |
| 6537 } |
| 6538 } |
| 6539 __ mov(untagged_key, key); |
| 6540 __ SmiUntag(untagged_key); |
| 6541 |
| 6542 // Verify that the receiver has pixel array elements. |
| 6543 __ mov(elements, FieldOperand(receiver, JSObject::kElementsOffset)); |
| 6544 __ CheckMap(elements, Factory::pixel_array_map(), not_pixel_array, true); |
| 6545 |
| 6546 // Key must be in range. |
| 6547 __ cmp(untagged_key, FieldOperand(elements, PixelArray::kLengthOffset)); |
| 6548 __ j(above_equal, out_of_range); // unsigned check handles negative keys. |
| 6549 |
| 6550 // Perform the indexed load and tag the result as a smi. |
| 6551 __ mov(elements, FieldOperand(elements, PixelArray::kExternalPointerOffset)); |
| 6552 __ movzx_b(result, Operand(elements, untagged_key, times_1, 0)); |
| 6553 __ SmiTag(result); |
| 6554 __ ret(0); |
| 6555 } |
| 6556 |
| 6557 |
6510 #undef __ | 6558 #undef __ |
6511 | 6559 |
6512 } } // namespace v8::internal | 6560 } } // namespace v8::internal |
6513 | 6561 |
6514 #endif // V8_TARGET_ARCH_IA32 | 6562 #endif // V8_TARGET_ARCH_IA32 |
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