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// 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/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, const 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];
}
const T* raw_data() const { return reps_; }
// 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_;
const T* reps_;
};
} // namespace internal
} // namespace v8
#endif // V8_SIGNATURE_H_
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