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Issue 6966041: Add complete ElementKind information directly to Map for objects with elements. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: review feedback Created 9 years, 6 months ago
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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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3326 // other stack fields, and clear the direction flag in anticipation 3326 // other stack fields, and clear the direction flag in anticipation
3327 // of calling CopyBytes. 3327 // of calling CopyBytes.
3328 __ subq(rsp, Immediate(2 * kPointerSize)); 3328 __ subq(rsp, Immediate(2 * kPointerSize));
3329 __ cld(); 3329 __ cld();
3330 // Check that the array is a JSArray 3330 // Check that the array is a JSArray
3331 __ JumpIfSmi(array, &bailout); 3331 __ JumpIfSmi(array, &bailout);
3332 __ CmpObjectType(array, JS_ARRAY_TYPE, scratch); 3332 __ CmpObjectType(array, JS_ARRAY_TYPE, scratch);
3333 __ j(not_equal, &bailout); 3333 __ j(not_equal, &bailout);
3334 3334
3335 // Check that the array has fast elements. 3335 // Check that the array has fast elements.
3336 __ testb(FieldOperand(scratch, Map::kBitField2Offset), 3336 __ CheckFastElements(scratch, &bailout);
3337 Immediate(1 << Map::kHasFastElements));
3338 __ j(zero, &bailout);
3339 3337
3340 // Array has fast elements, so its length must be a smi. 3338 // Array has fast elements, so its length must be a smi.
3341 // If the array has length zero, return the empty string. 3339 // If the array has length zero, return the empty string.
3342 __ movq(array_length, FieldOperand(array, JSArray::kLengthOffset)); 3340 __ movq(array_length, FieldOperand(array, JSArray::kLengthOffset));
3343 __ SmiCompare(array_length, Smi::FromInt(0)); 3341 __ SmiCompare(array_length, Smi::FromInt(0));
3344 __ j(not_zero, &non_trivial_array); 3342 __ j(not_zero, &non_trivial_array);
3345 __ LoadRoot(rax, Heap::kEmptyStringRootIndex); 3343 __ LoadRoot(rax, Heap::kEmptyStringRootIndex);
3346 __ jmp(&return_result); 3344 __ jmp(&return_result);
3347 3345
3348 // Save the array length on the stack. 3346 // Save the array length on the stack.
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4313 __ ret(0); 4311 __ ret(0);
4314 } 4312 }
4315 4313
4316 4314
4317 #undef __ 4315 #undef __
4318 4316
4319 4317
4320 } } // namespace v8::internal 4318 } } // namespace v8::internal
4321 4319
4322 #endif // V8_TARGET_ARCH_X64 4320 #endif // V8_TARGET_ARCH_X64
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