Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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 | #ifndef V8_SIGNATURE_H_ |
| 6 | #define V8_SIGNATURE_H_ |
| 7 | |
| 8 | #include "src/zone.h" |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | |
| 13 | // Describes the inputs and outputs of a function or call. |
| 14 | template <typename T> |
| 15 | class Signature : public ZoneObject { |
| 16 | public: |
| 17 | Signature(size_t return_count, size_t parameter_count, T* reps) |
| 18 | : return_count_(return_count), |
| 19 | parameter_count_(parameter_count), |
| 20 | reps_(reps) {} |
| 21 | |
| 22 | size_t return_count() const { return return_count_; } |
| 23 | size_t parameter_count() const { return parameter_count_; } |
| 24 | |
| 25 | T GetParam(size_t index) const { |
| 26 | DCHECK(index < parameter_count_); |
| 27 | return reps_[return_count_ + index]; |
| 28 | } |
| 29 | |
| 30 | T GetReturn(size_t index = 0) const { |
| 31 | DCHECK(index < return_count_); |
| 32 | return reps_[index]; |
| 33 | } |
| 34 | |
| 35 | // For incrementally building signatures. |
| 36 | class Builder { |
| 37 | public: |
| 38 | Builder(Zone* zone, size_t return_count, size_t parameter_count) |
| 39 | : return_count_(return_count), |
| 40 | parameter_count_(parameter_count), |
| 41 | zone_(zone), |
| 42 | rcursor_(0), |
| 43 | pcursor_(0), |
| 44 | buffer_(zone->NewArray<T>( |
| 45 | static_cast<int>(return_count + parameter_count))) {} |
| 46 | |
| 47 | const size_t return_count_; |
| 48 | const size_t parameter_count_; |
| 49 | |
| 50 | void AddReturn(T val) { |
| 51 | DCHECK(rcursor_ < return_count_); |
| 52 | buffer_[rcursor_++] = val; |
| 53 | } |
| 54 | void AddParam(T val) { |
| 55 | DCHECK(pcursor_ < parameter_count_); |
| 56 | buffer_[return_count_ + pcursor_++] = val; |
| 57 | } |
| 58 | Signature<T>* Build() { |
| 59 | DCHECK(rcursor_ == return_count_); |
| 60 | DCHECK(pcursor_ == parameter_count_); |
| 61 | return new (zone_) Signature<T>(return_count_, parameter_count_, buffer_); |
| 62 | } |
| 63 | |
| 64 | private: |
| 65 | Zone* zone_; |
| 66 | size_t rcursor_; |
| 67 | size_t pcursor_; |
| 68 | T* buffer_; |
| 69 | }; |
| 70 | |
| 71 | protected: |
| 72 | size_t return_count_; |
| 73 | size_t parameter_count_; |
| 74 | T* reps_; |
| 75 | }; |
| 76 | |
| 77 | } // namespace internal |
| 78 | } // namespace v8 |
| 79 | |
| 80 | #endif // V8_SIGNATURE_H_ |