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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "src/interpreter/bytecode-register-allocator.h" |
| 6 |
| 7 #include "src/interpreter/bytecode-array-builder.h" |
| 8 |
| 9 namespace v8 { |
| 10 namespace internal { |
| 11 namespace interpreter { |
| 12 |
| 13 BytecodeRegisterAllocator::BytecodeRegisterAllocator( |
| 14 BytecodeArrayBuilder* builder) |
| 15 : builder_(builder), |
| 16 allocated_(builder->zone()), |
| 17 next_consecutive_register_(-1), |
| 18 next_consecutive_count_(-1) {} |
| 19 |
| 20 |
| 21 BytecodeRegisterAllocator::~BytecodeRegisterAllocator() { |
| 22 for (auto i = allocated_.rbegin(); i != allocated_.rend(); i++) { |
| 23 builder_->ReturnTemporaryRegister(*i); |
| 24 } |
| 25 allocated_.clear(); |
| 26 } |
| 27 |
| 28 |
| 29 Register BytecodeRegisterAllocator::NewRegister() { |
| 30 int allocated = -1; |
| 31 if (next_consecutive_count_ <= 0) { |
| 32 allocated = builder_->BorrowTemporaryRegister(); |
| 33 } else { |
| 34 allocated = builder_->BorrowTemporaryRegisterNotInRange( |
| 35 next_consecutive_register_, |
| 36 next_consecutive_register_ + next_consecutive_count_ - 1); |
| 37 } |
| 38 allocated_.push_back(allocated); |
| 39 return Register(allocated); |
| 40 } |
| 41 |
| 42 |
| 43 bool BytecodeRegisterAllocator::RegisterIsAllocatedInThisScope( |
| 44 Register reg) const { |
| 45 for (auto i = allocated_.begin(); i != allocated_.end(); i++) { |
| 46 if (*i == reg.index()) return true; |
| 47 } |
| 48 return false; |
| 49 } |
| 50 |
| 51 |
| 52 void BytecodeRegisterAllocator::PrepareForConsecutiveAllocations(size_t count) { |
| 53 if (static_cast<int>(count) > next_consecutive_count_) { |
| 54 next_consecutive_register_ = |
| 55 builder_->PrepareForConsecutiveTemporaryRegisters(count); |
| 56 next_consecutive_count_ = static_cast<int>(count); |
| 57 } |
| 58 } |
| 59 |
| 60 |
| 61 Register BytecodeRegisterAllocator::NextConsecutiveRegister() { |
| 62 DCHECK_GE(next_consecutive_register_, 0); |
| 63 DCHECK_GT(next_consecutive_count_, 0); |
| 64 builder_->BorrowConsecutiveTemporaryRegister(next_consecutive_register_); |
| 65 allocated_.push_back(next_consecutive_register_); |
| 66 next_consecutive_count_--; |
| 67 return Register(next_consecutive_register_++); |
| 68 } |
| 69 |
| 70 } // namespace interpreter |
| 71 } // namespace internal |
| 72 } // namespace v8 |
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