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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 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 #include "src/interpreter/interpreter-assembler.h" | 5 #include "src/interpreter/interpreter-assembler.h" |
6 | 6 |
7 #include <limits> | 7 #include <limits> |
8 #include <ostream> | 8 #include <ostream> |
9 | 9 |
10 #include "src/code-factory.h" | 10 #include "src/code-factory.h" |
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460 | 460 |
461 Variable return_value(this, MachineRepresentation::kTagged); | 461 Variable return_value(this, MachineRepresentation::kTagged); |
462 Label handle_monomorphic(this), extra_checks(this), end(this), call(this); | 462 Label handle_monomorphic(this), extra_checks(this), end(this), call(this); |
463 | 463 |
464 // Slot id of 0 is used to indicate no typefeedback is available. Call using | 464 // Slot id of 0 is used to indicate no typefeedback is available. Call using |
465 // call builtin. | 465 // call builtin. |
466 STATIC_ASSERT(TypeFeedbackVector::kReservedIndexCount > 0); | 466 STATIC_ASSERT(TypeFeedbackVector::kReservedIndexCount > 0); |
467 Node* is_feedback_unavailable = Word32Equal(slot_id, Int32Constant(0)); | 467 Node* is_feedback_unavailable = Word32Equal(slot_id, Int32Constant(0)); |
468 GotoIf(is_feedback_unavailable, &call); | 468 GotoIf(is_feedback_unavailable, &call); |
469 | 469 |
470 // The checks. First, does rdi match the recorded monomorphic target? | 470 // The checks. First, does function match the recorded monomorphic target? |
471 Node* feedback_element = LoadFixedArrayElement(type_feedback_vector, slot_id); | 471 Node* feedback_element = LoadFixedArrayElement(type_feedback_vector, slot_id); |
472 Node* feedback_value = LoadWeakCellValue(feedback_element); | 472 Node* feedback_value = LoadWeakCellValue(feedback_element); |
473 Node* is_monomorphic = WordEqual(function, feedback_value); | 473 Node* is_monomorphic = WordEqual(function, feedback_value); |
474 BranchIf(is_monomorphic, &handle_monomorphic, &extra_checks); | 474 BranchIf(is_monomorphic, &handle_monomorphic, &extra_checks); |
475 | 475 |
476 Bind(&handle_monomorphic); | 476 Bind(&handle_monomorphic); |
477 { | 477 { |
478 // The compare above could have been a SMI/SMI comparison. Guard against | 478 // The compare above could have been a SMI/SMI comparison. Guard against |
479 // this convincing us that we have a monomorphic JSFunction. | 479 // this convincing us that we have a monomorphic JSFunction. |
480 Node* is_smi = WordIsSmi(function); | 480 Node* is_smi = WordIsSmi(function); |
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596 TailCallMode tail_call_mode) { | 596 TailCallMode tail_call_mode) { |
597 Callable callable = CodeFactory::InterpreterPushArgsAndCall( | 597 Callable callable = CodeFactory::InterpreterPushArgsAndCall( |
598 isolate(), tail_call_mode, CallableType::kAny); | 598 isolate(), tail_call_mode, CallableType::kAny); |
599 Node* code_target = HeapConstant(callable.code()); | 599 Node* code_target = HeapConstant(callable.code()); |
600 return CallStub(callable.descriptor(), code_target, context, arg_count, | 600 return CallStub(callable.descriptor(), code_target, context, arg_count, |
601 first_arg, function); | 601 first_arg, function); |
602 } | 602 } |
603 | 603 |
604 Node* InterpreterAssembler::CallConstruct(Node* constructor, Node* context, | 604 Node* InterpreterAssembler::CallConstruct(Node* constructor, Node* context, |
605 Node* new_target, Node* first_arg, | 605 Node* new_target, Node* first_arg, |
606 Node* arg_count) { | 606 Node* arg_count, Node* slot_id, |
607 Callable callable = CodeFactory::InterpreterPushArgsAndConstruct(isolate()); | 607 Node* type_feedback_vector) { |
608 Node* code_target = HeapConstant(callable.code()); | 608 Label call_construct(this), js_function(this), end(this); |
609 return CallStub(callable.descriptor(), code_target, context, arg_count, | 609 Variable return_value(this, MachineRepresentation::kTagged); |
610 new_target, constructor, first_arg); | 610 |
611 // Slot id of 0 is used to indicate no typefeedback is available. | |
612 STATIC_ASSERT(TypeFeedbackVector::kReservedIndexCount > 0); | |
613 Node* is_feedback_unavailable = Word32Equal(slot_id, Int32Constant(0)); | |
614 GotoIf(is_feedback_unavailable, &call_construct); | |
615 | |
616 // Check that the constructor is not a smi. | |
617 Node* is_smi = WordIsSmi(constructor); | |
618 GotoIf(is_smi, &call_construct); | |
619 | |
620 // Check that constructor is a JSFunction. | |
621 Node* instance_type = LoadInstanceType(constructor); | |
622 Node* is_js_function = | |
623 WordEqual(instance_type, Int32Constant(JS_FUNCTION_TYPE)); | |
624 BranchIf(is_js_function, &js_function, &call_construct); | |
625 | |
626 Bind(&js_function); | |
627 // Cache the called function in a feedback vector slot. Cache states | |
628 // are uninitialized, monomorphic (indicated by a JSFunction), and | |
629 // megamorphic. | |
630 Label increment_count(this), extra_checks(this), | |
631 call_construct_function(this); | |
632 | |
633 Node* feedback_element = LoadFixedArrayElement(type_feedback_vector, slot_id); | |
634 Node* feedback_value = LoadWeakCellValue(feedback_element); | |
635 Node* is_monomorphic = WordEqual(constructor, feedback_value); | |
636 BranchIf(is_monomorphic, &increment_count, &extra_checks); | |
637 | |
638 Bind(&increment_count); | |
639 { | |
640 // Increment the call count. | |
641 Node* call_count_slot = IntPtrAdd(slot_id, IntPtrConstant(1)); | |
642 Node* call_count = | |
643 LoadFixedArrayElement(type_feedback_vector, call_count_slot); | |
644 Node* new_count = SmiAdd(call_count, SmiTag(Int32Constant(1))); | |
645 // Count is Smi, so we don't need a write barrier. | |
646 StoreFixedArrayElement(type_feedback_vector, call_count_slot, new_count, | |
647 SKIP_WRITE_BARRIER); | |
648 Goto(&call_construct_function); | |
649 } | |
650 | |
651 Bind(&extra_checks); | |
652 { | |
653 Label mark_megamorphic(this), initialize(this), | |
654 check_weak_cell_cleared(this); | |
655 // Check if it is a megamorphic target | |
656 Node* is_megamorphic = WordEqual( | |
657 feedback_element, | |
658 HeapConstant(TypeFeedbackVector::MegamorphicSentinel(isolate()))); | |
659 GotoIf(is_megamorphic, &call_construct_function); | |
660 | |
661 // Check if it is uninitialized. | |
662 Node* is_uninitialized = WordEqual( | |
663 feedback_element, LoadRoot(Heap::kuninitialized_symbolRootIndex)); | |
664 BranchIf(is_uninitialized, &initialize, &check_weak_cell_cleared); | |
665 | |
666 Bind(&check_weak_cell_cleared); | |
667 { | |
668 Node* is_weak_cell = WordEqual(LoadMap(feedback_element), | |
669 LoadRoot(Heap::kWeakCellMapRootIndex)); | |
670 GotoUnless(is_weak_cell, &mark_megamorphic); | |
671 | |
672 // If the weak cell is cleared, we have a new chance to become | |
673 // monomorphic. | |
674 Node* is_smi = WordIsSmi(feedback_value); | |
675 BranchIf(is_smi, &initialize, &mark_megamorphic); | |
676 } | |
677 | |
678 Bind(&initialize); | |
679 { | |
680 // Check that it is not the Array() function. | |
681 Node* context_slot = | |
682 LoadFixedArrayElement(LoadNativeContext(context), | |
683 Int32Constant(Context::ARRAY_FUNCTION_INDEX)); | |
684 Node* is_array_function = WordEqual(context_slot, constructor); | |
685 GotoIf(is_array_function, &mark_megamorphic); | |
686 | |
687 Node* call_count_slot = IntPtrAdd(slot_id, IntPtrConstant(1)); | |
688 // Count is Smi, so we don't need a write barrier. | |
689 StoreFixedArrayElement(type_feedback_vector, call_count_slot, | |
690 SmiTag(Int32Constant(1)), SKIP_WRITE_BARRIER); | |
691 | |
692 CreateWeakCellStub weak_cell_stub(isolate()); | |
Benedikt Meurer
2016/07/17 19:37:13
Can you place a TODO here, that we want to inline
mythria
2016/07/18 09:22:40
Thanks Benedikt. I can look at it after I have don
| |
693 CallStub(weak_cell_stub.GetCallInterfaceDescriptor(), | |
694 HeapConstant(weak_cell_stub.GetCode()), context, | |
695 type_feedback_vector, SmiTag(slot_id), constructor); | |
696 Goto(&call_construct_function); | |
697 } | |
698 | |
699 Bind(&mark_megamorphic); | |
700 { | |
701 // MegamorphicSentinel is an immortal immovable object so no write-barrier | |
702 // is needed. | |
703 DCHECK(Heap::RootIsImmortalImmovable(Heap::kmegamorphic_symbolRootIndex)); | |
704 StoreFixedArrayElement( | |
705 type_feedback_vector, slot_id, | |
706 HeapConstant(TypeFeedbackVector::MegamorphicSentinel(isolate())), | |
707 SKIP_WRITE_BARRIER); | |
708 Goto(&call_construct_function); | |
709 } | |
710 } | |
711 | |
712 Bind(&call_construct_function); | |
713 { | |
714 // TODO(mythria): Get allocation site feedback if available. Currently | |
715 // we do not collect allocation site feedback. | |
716 Callable callable_function = CodeFactory::InterpreterPushArgsAndConstruct( | |
717 isolate(), CallableType::kJSFunction); | |
718 return_value.Bind(CallStub(callable_function.descriptor(), | |
719 HeapConstant(callable_function.code()), context, | |
720 arg_count, new_target, constructor, first_arg)); | |
721 Goto(&end); | |
722 } | |
723 | |
724 Bind(&call_construct); | |
725 { | |
726 Callable callable = CodeFactory::InterpreterPushArgsAndConstruct( | |
727 isolate(), CallableType::kAny); | |
728 Node* code_target = HeapConstant(callable.code()); | |
729 return_value.Bind(CallStub(callable.descriptor(), code_target, context, | |
730 arg_count, new_target, constructor, first_arg)); | |
731 Goto(&end); | |
732 } | |
733 | |
734 Bind(&end); | |
735 return return_value.value(); | |
611 } | 736 } |
612 | 737 |
613 Node* InterpreterAssembler::CallRuntimeN(Node* function_id, Node* context, | 738 Node* InterpreterAssembler::CallRuntimeN(Node* function_id, Node* context, |
614 Node* first_arg, Node* arg_count, | 739 Node* first_arg, Node* arg_count, |
615 int result_size) { | 740 int result_size) { |
616 Callable callable = CodeFactory::InterpreterCEntry(isolate(), result_size); | 741 Callable callable = CodeFactory::InterpreterCEntry(isolate(), result_size); |
617 Node* code_target = HeapConstant(callable.code()); | 742 Node* code_target = HeapConstant(callable.code()); |
618 | 743 |
619 // Get the function entry from the function id. | 744 // Get the function entry from the function id. |
620 Node* function_table = ExternalConstant( | 745 Node* function_table = ExternalConstant( |
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932 Goto(&loop); | 1057 Goto(&loop); |
933 } | 1058 } |
934 Bind(&done_loop); | 1059 Bind(&done_loop); |
935 | 1060 |
936 return array; | 1061 return array; |
937 } | 1062 } |
938 | 1063 |
939 } // namespace interpreter | 1064 } // namespace interpreter |
940 } // namespace internal | 1065 } // namespace internal |
941 } // namespace v8 | 1066 } // namespace v8 |
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