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Issue 2028633002: Provide a tagged allocation top pointer. Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: WIP: adding a few tests. Created 4 years, 6 months ago
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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 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #if V8_TARGET_ARCH_ARM 5 #if V8_TARGET_ARCH_ARM
6 6
7 #include "src/code-stubs.h" 7 #include "src/code-stubs.h"
8 #include "src/api-arguments.h" 8 #include "src/api-arguments.h"
9 #include "src/base/bits.h" 9 #include "src/base/bits.h"
10 #include "src/bootstrapper.h" 10 #include "src/bootstrapper.h"
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4326 // Fall back to runtime if the target differs from the new target's 4326 // Fall back to runtime if the target differs from the new target's
4327 // initial map constructor. 4327 // initial map constructor.
4328 __ ldr(r0, FieldMemOperand(r2, Map::kConstructorOrBackPointerOffset)); 4328 __ ldr(r0, FieldMemOperand(r2, Map::kConstructorOrBackPointerOffset));
4329 __ cmp(r0, r1); 4329 __ cmp(r0, r1);
4330 __ b(ne, &new_object); 4330 __ b(ne, &new_object);
4331 4331
4332 // Allocate the JSObject on the heap. 4332 // Allocate the JSObject on the heap.
4333 Label allocate, done_allocate; 4333 Label allocate, done_allocate;
4334 __ ldrb(r4, FieldMemOperand(r2, Map::kInstanceSizeOffset)); 4334 __ ldrb(r4, FieldMemOperand(r2, Map::kInstanceSizeOffset));
4335 __ Allocate(r4, r0, r5, r6, &allocate, SIZE_IN_WORDS); 4335 __ Allocate(r4, r0, r5, r6, &allocate, SIZE_IN_WORDS);
4336 __ sub(r5, r5, Operand(kHeapObjectTag)); // Untag result end.
4336 __ bind(&done_allocate); 4337 __ bind(&done_allocate);
4337 4338
4338 // Initialize the JSObject fields. 4339 // Initialize the JSObject fields.
4339 __ str(r2, FieldMemOperand(r0, JSObject::kMapOffset)); 4340 __ str(r2, FieldMemOperand(r0, JSObject::kMapOffset));
4340 __ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex); 4341 __ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
4341 __ str(r3, FieldMemOperand(r0, JSObject::kPropertiesOffset)); 4342 __ str(r3, FieldMemOperand(r0, JSObject::kPropertiesOffset));
4342 __ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset)); 4343 __ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset));
4343 STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize); 4344 STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize);
4344 __ add(r1, r0, Operand(JSObject::kHeaderSize - kHeapObjectTag)); 4345 __ add(r1, r0, Operand(JSObject::kHeaderSize - kHeapObjectTag));
4345 4346
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4466 __ bind(&no_rest_parameters); 4467 __ bind(&no_rest_parameters);
4467 { 4468 {
4468 // ----------- S t a t e ------------- 4469 // ----------- S t a t e -------------
4469 // -- cp : context 4470 // -- cp : context
4470 // -- lr : return address 4471 // -- lr : return address
4471 // ----------------------------------- 4472 // -----------------------------------
4472 4473
4473 // Allocate an empty rest parameter array. 4474 // Allocate an empty rest parameter array.
4474 Label allocate, done_allocate; 4475 Label allocate, done_allocate;
4475 __ Allocate(JSArray::kSize, r0, r1, r2, &allocate, NO_ALLOCATION_FLAGS); 4476 __ Allocate(JSArray::kSize, r0, r1, r2, &allocate, NO_ALLOCATION_FLAGS);
4477 __ sub(r1, r1, Operand(kHeapObjectTag)); // Untag result end.
4476 __ bind(&done_allocate); 4478 __ bind(&done_allocate);
4477 4479
4478 // Setup the rest parameter array in r0. 4480 // Setup the rest parameter array in r0.
4479 __ LoadNativeContextSlot(Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, r1); 4481 __ LoadNativeContextSlot(Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, r1);
4480 __ str(r1, FieldMemOperand(r0, JSArray::kMapOffset)); 4482 __ str(r1, FieldMemOperand(r0, JSArray::kMapOffset));
4481 __ LoadRoot(r1, Heap::kEmptyFixedArrayRootIndex); 4483 __ LoadRoot(r1, Heap::kEmptyFixedArrayRootIndex);
4482 __ str(r1, FieldMemOperand(r0, JSArray::kPropertiesOffset)); 4484 __ str(r1, FieldMemOperand(r0, JSArray::kPropertiesOffset));
4483 __ str(r1, FieldMemOperand(r0, JSArray::kElementsOffset)); 4485 __ str(r1, FieldMemOperand(r0, JSArray::kElementsOffset));
4484 __ mov(r1, Operand(0)); 4486 __ mov(r1, Operand(0));
4485 __ str(r1, FieldMemOperand(r0, JSArray::kLengthOffset)); 4487 __ str(r1, FieldMemOperand(r0, JSArray::kLengthOffset));
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5366 CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, 5368 CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
5367 kStackUnwindSpace, NULL, return_value_operand, NULL); 5369 kStackUnwindSpace, NULL, return_value_operand, NULL);
5368 } 5370 }
5369 5371
5370 #undef __ 5372 #undef __
5371 5373
5372 } // namespace internal 5374 } // namespace internal
5373 } // namespace v8 5375 } // namespace v8
5374 5376
5375 #endif // V8_TARGET_ARCH_ARM 5377 #endif // V8_TARGET_ARCH_ARM
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