| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_SIGNATURE_H_ |
| #define V8_SIGNATURE_H_ |
| |
| #include "src/zone.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Describes the inputs and outputs of a function or call. |
| template <typename T> |
| class Signature : public ZoneObject { |
| public: |
| Signature(size_t return_count, size_t parameter_count, T* reps) |
| : return_count_(return_count), |
| parameter_count_(parameter_count), |
| reps_(reps) {} |
| |
| size_t return_count() const { return return_count_; } |
| size_t parameter_count() const { return parameter_count_; } |
| |
| T GetParam(size_t index) const { |
| DCHECK(index < parameter_count_); |
| return reps_[return_count_ + index]; |
| } |
| |
| T GetReturn(size_t index = 0) const { |
| DCHECK(index < return_count_); |
| return reps_[index]; |
| } |
| |
| // For incrementally building signatures. |
| class Builder { |
| public: |
| Builder(Zone* zone, size_t return_count, size_t parameter_count) |
| : return_count_(return_count), |
| parameter_count_(parameter_count), |
| zone_(zone), |
| rcursor_(0), |
| pcursor_(0), |
| buffer_(zone->NewArray<T>( |
| static_cast<int>(return_count + parameter_count))) {} |
| |
| const size_t return_count_; |
| const size_t parameter_count_; |
| |
| void AddReturn(T val) { |
| DCHECK(rcursor_ < return_count_); |
| buffer_[rcursor_++] = val; |
| } |
| void AddParam(T val) { |
| DCHECK(pcursor_ < parameter_count_); |
| buffer_[return_count_ + pcursor_++] = val; |
| } |
| Signature<T>* Build() { |
| DCHECK(rcursor_ == return_count_); |
| DCHECK(pcursor_ == parameter_count_); |
| return new (zone_) Signature<T>(return_count_, parameter_count_, buffer_); |
| } |
| |
| private: |
| Zone* zone_; |
| size_t rcursor_; |
| size_t pcursor_; |
| T* buffer_; |
| }; |
| |
| protected: |
| size_t return_count_; |
| size_t parameter_count_; |
| T* reps_; |
| }; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_SIGNATURE_H_ |