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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_CODEGEN_SIGNATURE_H_
#define V8_CODEGEN_SIGNATURE_H_
#include "src/base/functional.h"
#include "src/base/iterator.h"
#include "src/codegen/machine-type.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:
constexpr Signature(size_t return_count, size_t parameter_count,
const T* reps)
: return_count_(return_count),
parameter_count_(parameter_count),
reps_(reps) {
DCHECK_EQ(kReturnCountOffset, offsetof(Signature, return_count_));
DCHECK_EQ(kParameterCountOffset, offsetof(Signature, parameter_count_));
DCHECK_EQ(kRepsOffset, offsetof(Signature, reps_));
STATIC_ASSERT(std::is_standard_layout<Signature<T>>::value);
}
size_t return_count() const { return return_count_; }
size_t parameter_count() const { return parameter_count_; }
T GetParam(size_t index) const {
DCHECK_LT(index, parameter_count_);
return reps_[return_count_ + index];
}
T GetReturn(size_t index = 0) const {
DCHECK_LT(index, return_count_);
return reps_[index];
}
// Iteration support.
base::iterator_range<const T*> parameters() const {
return {reps_ + return_count_, reps_ + return_count_ + parameter_count_};
}
base::iterator_range<const T*> returns() const {
return {reps_, reps_ + return_count_};
}
base::iterator_range<const T*> all() const {
return {reps_, reps_ + return_count_ + parameter_count_};
}
bool operator==(const Signature& other) const {
if (this == &other) return true;
if (parameter_count() != other.parameter_count()) return false;
if (return_count() != other.return_count()) return false;
return std::equal(all().begin(), all().end(), other.all().begin());
}
bool operator!=(const Signature& other) const { return !(*this == other); }
// 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_LT(rcursor_, return_count_);
buffer_[rcursor_++] = val;
}
void AddParam(T val) {
DCHECK_LT(pcursor_, parameter_count_);
buffer_[return_count_ + pcursor_++] = val;
}
void AddParamAt(size_t index, T val) {
DCHECK_LT(index, parameter_count_);
buffer_[return_count_ + index] = val;
pcursor_ = std::max(pcursor_, index + 1);
}
Signature<T>* Build() {
DCHECK_EQ(rcursor_, return_count_);
DCHECK_EQ(pcursor_, parameter_count_);
return zone_->New<Signature<T>>(return_count_, parameter_count_, buffer_);
}
private:
Zone* zone_;
size_t rcursor_;
size_t pcursor_;
T* buffer_;
};
static constexpr size_t kReturnCountOffset = 0;
static constexpr size_t kParameterCountOffset =
kReturnCountOffset + kSizetSize;
static constexpr size_t kRepsOffset = kParameterCountOffset + kSizetSize;
protected:
size_t return_count_;
size_t parameter_count_;
const T* reps_;
};
using MachineSignature = Signature<MachineType>;
template <typename T>
size_t hash_value(const Signature<T>& sig) {
size_t hash = base::hash_combine(sig.parameter_count(), sig.return_count());
for (const T& t : sig.all()) hash = base::hash_combine(hash, t);
return hash;
}
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_SIGNATURE_H_
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