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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/bytecode-array-builder.h" | 5 #include "src/interpreter/bytecode-array-builder.h" |
6 | 6 |
7 namespace v8 { | 7 namespace v8 { |
8 namespace internal { | 8 namespace internal { |
9 namespace interpreter { | 9 namespace interpreter { |
10 | 10 |
11 class BytecodeArrayBuilder::PreviousBytecodeHelper { | 11 class BytecodeArrayBuilder::PreviousBytecodeHelper { |
12 public: | 12 public: |
13 explicit PreviousBytecodeHelper(const BytecodeArrayBuilder& array_builder) | 13 explicit PreviousBytecodeHelper(const BytecodeArrayBuilder& array_builder) |
14 : array_builder_(array_builder) {} | 14 : array_builder_(array_builder) {} |
oth
2015/12/08 09:54:14
It would be better to have:
CHECK(array_builder-
mythria
2015/12/08 11:24:42
Done.
| |
15 | 15 |
16 Bytecode GetBytecode() const { | 16 bool GetBytecode(Bytecode* bytecode) const { |
oth
2015/12/08 09:54:15
Propose leaving this as Bytecode, adding MUST_USE_
mythria
2015/12/08 11:24:42
Done.
| |
17 // Returns the previous bytecode in the same basicblock. If there is none it | 17 // Returns the previous bytecode in the same basicblock. If there is none it |
18 // returns Bytecode::kLast. | 18 // returns false and does not change bytecode. |
19 if (!array_builder_.LastBytecodeInSameBlock()) { | 19 if (!array_builder_.LastBytecodeInSameBlock()) { |
20 return Bytecode::kLast; | 20 return false; |
21 } | 21 } |
22 return Bytecodes::FromByte( | 22 *bytecode = Bytecodes::FromByte( |
23 array_builder_.bytecodes()->at(array_builder_.last_bytecode_start_)); | 23 array_builder_.bytecodes()->at(array_builder_.last_bytecode_start_)); |
24 return true; | |
24 } | 25 } |
25 | 26 |
26 uint32_t GetOperand(int operand_index) const { | 27 uint32_t GetOperand(int operand_index) const { |
oth
2015/12/08 09:54:14
Propse adding MUST_USE_RESULT and DCHECK'ing in th
mythria
2015/12/08 11:24:42
The DCHECK is done when we call GetBytecode() from
| |
27 Bytecode bytecode = GetBytecode(); | 28 Bytecode bytecode = Bytecode::kLast; |
29 CHECK(GetBytecode(&bytecode)); | |
28 DCHECK_GE(operand_index, 0); | 30 DCHECK_GE(operand_index, 0); |
29 DCHECK_LT(operand_index, Bytecodes::NumberOfOperands(bytecode)); | 31 DCHECK_LT(operand_index, Bytecodes::NumberOfOperands(bytecode)); |
30 size_t operand_offset = | 32 size_t operand_offset = |
31 array_builder_.last_bytecode_start_ + | 33 array_builder_.last_bytecode_start_ + |
32 Bytecodes::GetOperandOffset(bytecode, operand_index); | 34 Bytecodes::GetOperandOffset(bytecode, operand_index); |
33 OperandSize size = Bytecodes::GetOperandSize(bytecode, operand_index); | 35 OperandSize size = Bytecodes::GetOperandSize(bytecode, operand_index); |
34 switch (size) { | 36 switch (size) { |
35 default: | 37 default: |
36 case OperandSize::kNone: | 38 case OperandSize::kNone: |
37 UNREACHABLE(); | 39 UNREACHABLE(); |
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574 | 576 |
575 | 577 |
576 BytecodeArrayBuilder& BytecodeArrayBuilder::PopContext(Register context) { | 578 BytecodeArrayBuilder& BytecodeArrayBuilder::PopContext(Register context) { |
577 Output(Bytecode::kPopContext, context.ToOperand()); | 579 Output(Bytecode::kPopContext, context.ToOperand()); |
578 return *this; | 580 return *this; |
579 } | 581 } |
580 | 582 |
581 | 583 |
582 bool BytecodeArrayBuilder::NeedToBooleanCast() { | 584 bool BytecodeArrayBuilder::NeedToBooleanCast() { |
583 PreviousBytecodeHelper previous_bytecode(*this); | 585 PreviousBytecodeHelper previous_bytecode(*this); |
584 switch (previous_bytecode.GetBytecode()) { | 586 Bytecode bytecode = Bytecode::kLast; |
587 if (!previous_bytecode.GetBytecode(&bytecode)) { | |
588 return true; | |
589 } | |
590 switch (bytecode) { | |
585 case Bytecode::kToBoolean: | 591 case Bytecode::kToBoolean: |
586 UNREACHABLE(); | 592 UNREACHABLE(); |
587 // If the previous bytecode puts a boolean in the accumulator return true. | 593 // If the previous bytecode puts a boolean in the accumulator return true. |
588 case Bytecode::kLdaTrue: | 594 case Bytecode::kLdaTrue: |
589 case Bytecode::kLdaFalse: | 595 case Bytecode::kLdaFalse: |
590 case Bytecode::kLogicalNot: | 596 case Bytecode::kLogicalNot: |
591 case Bytecode::kTestEqual: | 597 case Bytecode::kTestEqual: |
592 case Bytecode::kTestNotEqual: | 598 case Bytecode::kTestNotEqual: |
593 case Bytecode::kTestEqualStrict: | 599 case Bytecode::kTestEqualStrict: |
594 case Bytecode::kTestNotEqualStrict: | 600 case Bytecode::kTestNotEqualStrict: |
595 case Bytecode::kTestLessThan: | 601 case Bytecode::kTestLessThan: |
596 case Bytecode::kTestLessThanOrEqual: | 602 case Bytecode::kTestLessThanOrEqual: |
597 case Bytecode::kTestGreaterThan: | 603 case Bytecode::kTestGreaterThan: |
598 case Bytecode::kTestGreaterThanOrEqual: | 604 case Bytecode::kTestGreaterThanOrEqual: |
599 case Bytecode::kTestInstanceOf: | 605 case Bytecode::kTestInstanceOf: |
600 case Bytecode::kTestIn: | 606 case Bytecode::kTestIn: |
601 case Bytecode::kForInDone: | 607 case Bytecode::kForInDone: |
602 return false; | 608 return false; |
603 // Also handles the case where the previous bytecode was in a different | |
604 // block. | |
605 default: | 609 default: |
606 return true; | 610 return true; |
607 } | 611 } |
608 } | 612 } |
609 | 613 |
610 | 614 |
611 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToBoolean() { | 615 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToBoolean() { |
612 PreviousBytecodeHelper previous_bytecode(*this); | 616 PreviousBytecodeHelper previous_bytecode(*this); |
613 // If the previous bytecode puts a boolean in the accumulator | 617 // If the previous bytecode puts a boolean in the accumulator |
614 // there is no need to emit an instruction. | 618 // there is no need to emit an instruction. |
615 if (NeedToBooleanCast()) { | 619 if (NeedToBooleanCast()) { |
616 switch (previous_bytecode.GetBytecode()) { | 620 Bytecode bytecode = Bytecode::kLast; |
621 if (!previous_bytecode.GetBytecode(&bytecode)) { | |
622 Output(Bytecode::kToBoolean); | |
623 return *this; | |
624 } | |
625 switch (bytecode) { | |
617 // If the previous bytecode is a constant evaluate it and return false. | 626 // If the previous bytecode is a constant evaluate it and return false. |
618 case Bytecode::kLdaZero: { | 627 case Bytecode::kLdaZero: { |
619 LoadFalse(); | 628 LoadFalse(); |
620 break; | 629 break; |
621 } | 630 } |
622 case Bytecode::kLdaSmi8: { | 631 case Bytecode::kLdaSmi8: { |
623 LoadBooleanConstant(previous_bytecode.GetOperand(0) != 0); | 632 LoadBooleanConstant(previous_bytecode.GetOperand(0) != 0); |
624 break; | 633 break; |
625 } | 634 } |
626 case Bytecode::kLdaConstant: { | 635 case Bytecode::kLdaConstant: { |
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637 | 646 |
638 | 647 |
639 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToJSObject() { | 648 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToJSObject() { |
640 Output(Bytecode::kToObject); | 649 Output(Bytecode::kToObject); |
641 return *this; | 650 return *this; |
642 } | 651 } |
643 | 652 |
644 | 653 |
645 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToName() { | 654 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToName() { |
646 PreviousBytecodeHelper previous_bytecode(*this); | 655 PreviousBytecodeHelper previous_bytecode(*this); |
647 switch (previous_bytecode.GetBytecode()) { | 656 Bytecode bytecode = Bytecode::kLast; |
657 if (!previous_bytecode.GetBytecode(&bytecode)) { | |
658 Output(Bytecode::kToName); | |
659 return *this; | |
660 } | |
661 switch (bytecode) { | |
662 case Bytecode::kToName: | |
663 case Bytecode::kTypeOf: | |
664 return *this; | |
648 case Bytecode::kLdaConstantWide: | 665 case Bytecode::kLdaConstantWide: |
649 case Bytecode::kLdaConstant: { | 666 case Bytecode::kLdaConstant: { |
650 Handle<Object> object = previous_bytecode.GetConstantForIndexOperand(0); | 667 Handle<Object> object = previous_bytecode.GetConstantForIndexOperand(0); |
651 if (object->IsName()) return *this; | 668 if (object->IsName()) return *this; |
652 break; | 669 break; |
653 } | 670 } |
654 case Bytecode::kToName: | |
655 case Bytecode::kTypeOf: | |
656 return *this; | |
657 default: | 671 default: |
658 break; | 672 break; |
659 } | 673 } |
660 Output(Bytecode::kToName); | 674 Output(Bytecode::kToName); |
661 return *this; | 675 return *this; |
662 } | 676 } |
663 | 677 |
664 | 678 |
665 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToNumber() { | 679 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToNumber() { |
666 // TODO(rmcilroy): consider omitting if the preceeding bytecode always returns | 680 // TODO(rmcilroy): consider omitting if the preceeding bytecode always returns |
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1083 | 1097 |
1084 | 1098 |
1085 bool BytecodeArrayBuilder::LastBytecodeInSameBlock() const { | 1099 bool BytecodeArrayBuilder::LastBytecodeInSameBlock() const { |
1086 return last_bytecode_start_ < bytecodes()->size() && | 1100 return last_bytecode_start_ < bytecodes()->size() && |
1087 last_bytecode_start_ >= last_block_end_; | 1101 last_bytecode_start_ >= last_block_end_; |
1088 } | 1102 } |
1089 | 1103 |
1090 | 1104 |
1091 bool BytecodeArrayBuilder::IsRegisterInAccumulator(Register reg) { | 1105 bool BytecodeArrayBuilder::IsRegisterInAccumulator(Register reg) { |
1092 PreviousBytecodeHelper previous_bytecode(*this); | 1106 PreviousBytecodeHelper previous_bytecode(*this); |
1093 if (previous_bytecode.GetBytecode() == Bytecode::kLdar || | 1107 Bytecode bytecode = Bytecode::kLast; |
1094 previous_bytecode.GetBytecode() == Bytecode::kStar) { | 1108 if (!previous_bytecode.GetBytecode(&bytecode)) { |
1095 if (reg == Register::FromOperand(previous_bytecode.GetOperand(0))) { | 1109 return false; |
1096 return true; | 1110 } |
1097 } | 1111 if ((bytecode == Bytecode::kLdar || bytecode == Bytecode::kStar) && |
1112 (reg == Register::FromOperand(previous_bytecode.GetOperand(0)))) { | |
1113 return true; | |
1098 } | 1114 } |
1099 return false; | 1115 return false; |
1100 } | 1116 } |
1101 | 1117 |
1102 | 1118 |
1103 // static | 1119 // static |
1104 Bytecode BytecodeArrayBuilder::BytecodeForBinaryOperation(Token::Value op) { | 1120 Bytecode BytecodeArrayBuilder::BytecodeForBinaryOperation(Token::Value op) { |
1105 switch (op) { | 1121 switch (op) { |
1106 case Token::Value::ADD: | 1122 case Token::Value::ADD: |
1107 return Bytecode::kAdd; | 1123 return Bytecode::kAdd; |
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1424 DCHECK_GT(next_consecutive_count_, 0); | 1440 DCHECK_GT(next_consecutive_count_, 0); |
1425 builder_->BorrowConsecutiveTemporaryRegister(next_consecutive_register_); | 1441 builder_->BorrowConsecutiveTemporaryRegister(next_consecutive_register_); |
1426 allocated_.push_back(next_consecutive_register_); | 1442 allocated_.push_back(next_consecutive_register_); |
1427 next_consecutive_count_--; | 1443 next_consecutive_count_--; |
1428 return Register(next_consecutive_register_++); | 1444 return Register(next_consecutive_register_++); |
1429 } | 1445 } |
1430 | 1446 |
1431 } // namespace interpreter | 1447 } // namespace interpreter |
1432 } // namespace internal | 1448 } // namespace internal |
1433 } // namespace v8 | 1449 } // namespace v8 |
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