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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 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/compiler/instruction-selector.h" | 5 #include "src/compiler/instruction-selector.h" |
6 | 6 |
7 #include <limits> | 7 #include <limits> |
8 | 8 |
9 #include "src/compiler/instruction-selector-impl.h" | 9 #include "src/compiler/instruction-selector-impl.h" |
10 #include "src/compiler/node-matchers.h" | 10 #include "src/compiler/node-matchers.h" |
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468 for (BasicBlock::reverse_iterator i = block->rbegin(); i != block->rend(); | 468 for (BasicBlock::reverse_iterator i = block->rbegin(); i != block->rend(); |
469 ++i) { | 469 ++i) { |
470 Node* node = *i; | 470 Node* node = *i; |
471 // Skip nodes that are unused or already defined. | 471 // Skip nodes that are unused or already defined. |
472 if (!IsUsed(node) || IsDefined(node)) continue; | 472 if (!IsUsed(node) || IsDefined(node)) continue; |
473 // Generate code for this node "top down", but schedule the code "bottom | 473 // Generate code for this node "top down", but schedule the code "bottom |
474 // up". | 474 // up". |
475 size_t current_node_end = instructions_.size(); | 475 size_t current_node_end = instructions_.size(); |
476 VisitNode(node); | 476 VisitNode(node); |
477 std::reverse(instructions_.begin() + current_node_end, instructions_.end()); | 477 std::reverse(instructions_.begin() + current_node_end, instructions_.end()); |
| 478 if (instructions_.size() == current_node_end) continue; |
| 479 // Mark source position on first instruction emitted. |
| 480 SourcePosition source_position = source_positions_->GetSourcePosition(node); |
| 481 if (source_position.IsUnknown()) continue; |
| 482 DCHECK(!source_position.IsInvalid()); |
| 483 if (FLAG_turbo_source_positions || node->opcode() == IrOpcode::kCall) { |
| 484 sequence()->SetSourcePosition(instructions_[current_node_end], |
| 485 source_position); |
| 486 } |
478 } | 487 } |
479 | 488 |
480 // We're done with the block. | 489 // We're done with the block. |
481 InstructionBlock* instruction_block = | 490 InstructionBlock* instruction_block = |
482 sequence()->InstructionBlockAt(RpoNumber::FromInt(block->rpo_number())); | 491 sequence()->InstructionBlockAt(RpoNumber::FromInt(block->rpo_number())); |
483 instruction_block->set_code_start(static_cast<int>(instructions_.size())); | 492 instruction_block->set_code_start(static_cast<int>(instructions_.size())); |
484 instruction_block->set_code_end(current_block_end); | 493 instruction_block->set_code_end(current_block_end); |
485 | 494 |
486 current_block_ = NULL; | 495 current_block_ = NULL; |
487 } | 496 } |
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574 } | 583 } |
575 default: | 584 default: |
576 UNREACHABLE(); | 585 UNREACHABLE(); |
577 break; | 586 break; |
578 } | 587 } |
579 } | 588 } |
580 | 589 |
581 | 590 |
582 void InstructionSelector::VisitNode(Node* node) { | 591 void InstructionSelector::VisitNode(Node* node) { |
583 DCHECK_NOT_NULL(schedule()->block(node)); // should only use scheduled nodes. | 592 DCHECK_NOT_NULL(schedule()->block(node)); // should only use scheduled nodes. |
584 SourcePosition source_position = source_positions_->GetSourcePosition(node); | |
585 if (!source_position.IsUnknown()) { | |
586 DCHECK(!source_position.IsInvalid()); | |
587 if (FLAG_turbo_source_positions || node->opcode() == IrOpcode::kCall) { | |
588 Emit(SourcePositionInstruction::New(instruction_zone(), source_position)); | |
589 } | |
590 } | |
591 switch (node->opcode()) { | 593 switch (node->opcode()) { |
592 case IrOpcode::kStart: | 594 case IrOpcode::kStart: |
593 case IrOpcode::kLoop: | 595 case IrOpcode::kLoop: |
594 case IrOpcode::kEnd: | 596 case IrOpcode::kEnd: |
595 case IrOpcode::kBranch: | 597 case IrOpcode::kBranch: |
596 case IrOpcode::kIfTrue: | 598 case IrOpcode::kIfTrue: |
597 case IrOpcode::kIfFalse: | 599 case IrOpcode::kIfFalse: |
598 case IrOpcode::kIfSuccess: | 600 case IrOpcode::kIfSuccess: |
599 case IrOpcode::kSwitch: | 601 case IrOpcode::kSwitch: |
600 case IrOpcode::kIfValue: | 602 case IrOpcode::kIfValue: |
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1198 MachineOperatorBuilder::Flags | 1200 MachineOperatorBuilder::Flags |
1199 InstructionSelector::SupportedMachineOperatorFlags() { | 1201 InstructionSelector::SupportedMachineOperatorFlags() { |
1200 return MachineOperatorBuilder::Flag::kNoFlags; | 1202 return MachineOperatorBuilder::Flag::kNoFlags; |
1201 } | 1203 } |
1202 | 1204 |
1203 #endif // !V8_TURBOFAN_BACKEND | 1205 #endif // !V8_TURBOFAN_BACKEND |
1204 | 1206 |
1205 } // namespace compiler | 1207 } // namespace compiler |
1206 } // namespace internal | 1208 } // namespace internal |
1207 } // namespace v8 | 1209 } // namespace v8 |
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