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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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271 __ InitializeFieldsWithFiller(rcx, rdi, rdx); | 271 __ InitializeFieldsWithFiller(rcx, rdi, rdx); |
272 } | 272 } |
273 | 273 |
274 // Add the object tag to make the JSObject real, so that we can continue | 274 // Add the object tag to make the JSObject real, so that we can continue |
275 // and jump into the continuation code at any time from now on. Any | 275 // and jump into the continuation code at any time from now on. Any |
276 // failures need to undo the allocation, so that the heap is in a | 276 // failures need to undo the allocation, so that the heap is in a |
277 // consistent state and verifiable. | 277 // consistent state and verifiable. |
278 // rax: initial map | 278 // rax: initial map |
279 // rbx: JSObject | 279 // rbx: JSObject |
280 // rdi: start of next object | 280 // rdi: start of next object |
281 __ or_(rbx, Immediate(kHeapObjectTag)); | 281 __ orp(rbx, Immediate(kHeapObjectTag)); |
282 | 282 |
283 // Check if a non-empty properties array is needed. | 283 // Check if a non-empty properties array is needed. |
284 // Allocate and initialize a FixedArray if it is. | 284 // Allocate and initialize a FixedArray if it is. |
285 // rax: initial map | 285 // rax: initial map |
286 // rbx: JSObject | 286 // rbx: JSObject |
287 // rdi: start of next object | 287 // rdi: start of next object |
288 // Calculate total properties described map. | 288 // Calculate total properties described map. |
289 __ movzxbp(rdx, FieldOperand(rax, Map::kUnusedPropertyFieldsOffset)); | 289 __ movzxbp(rdx, FieldOperand(rax, Map::kUnusedPropertyFieldsOffset)); |
290 __ movzxbp(rcx, | 290 __ movzxbp(rcx, |
291 FieldOperand(rax, Map::kPreAllocatedPropertyFieldsOffset)); | 291 FieldOperand(rax, Map::kPreAllocatedPropertyFieldsOffset)); |
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335 __ addp(rcx, Immediate(kPointerSize)); | 335 __ addp(rcx, Immediate(kPointerSize)); |
336 __ bind(&entry); | 336 __ bind(&entry); |
337 __ cmpp(rcx, rax); | 337 __ cmpp(rcx, rax); |
338 __ j(below, &loop); | 338 __ j(below, &loop); |
339 } | 339 } |
340 | 340 |
341 // Store the initialized FixedArray into the properties field of | 341 // Store the initialized FixedArray into the properties field of |
342 // the JSObject | 342 // the JSObject |
343 // rbx: JSObject | 343 // rbx: JSObject |
344 // rdi: FixedArray | 344 // rdi: FixedArray |
345 __ or_(rdi, Immediate(kHeapObjectTag)); // add the heap tag | 345 __ orp(rdi, Immediate(kHeapObjectTag)); // add the heap tag |
346 __ movp(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi); | 346 __ movp(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi); |
347 | 347 |
348 | 348 |
349 // Continue with JSObject being successfully allocated | 349 // Continue with JSObject being successfully allocated |
350 // rbx: JSObject | 350 // rbx: JSObject |
351 __ jmp(&allocated); | 351 __ jmp(&allocated); |
352 | 352 |
353 // Undo the setting of the new top so that the heap is verifiable. For | 353 // Undo the setting of the new top so that the heap is verifiable. For |
354 // example, the map's unused properties potentially do not match the | 354 // example, the map's unused properties potentially do not match the |
355 // allocated objects unused properties. | 355 // allocated objects unused properties. |
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1494 __ bind(&ok); | 1494 __ bind(&ok); |
1495 __ ret(0); | 1495 __ ret(0); |
1496 } | 1496 } |
1497 | 1497 |
1498 | 1498 |
1499 #undef __ | 1499 #undef __ |
1500 | 1500 |
1501 } } // namespace v8::internal | 1501 } } // namespace v8::internal |
1502 | 1502 |
1503 #endif // V8_TARGET_ARCH_X64 | 1503 #endif // V8_TARGET_ARCH_X64 |
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