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// Copyright 2022 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 jit_riscv64_constant_util_riscv64__h_
#define jit_riscv64_constant_util_riscv64__h_
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
namespace js {
namespace jit {
template <typename T>
class V8Vector {
public:
V8Vector() : start_(nullptr), length_(0) {}
V8Vector(T* data, int length) : start_(data), length_(length) {
MOZ_ASSERT(length == 0 || (length > 0 && data != nullptr));
}
// Returns the length of the vector.
int length() const { return length_; }
// Returns the pointer to the start of the data in the vector.
T* start() const { return start_; }
// Access individual vector elements - checks bounds in debug mode.
T& operator[](int index) const {
MOZ_ASSERT(0 <= index && index < length_);
return start_[index];
}
inline V8Vector<T> operator+(int offset) {
MOZ_ASSERT(offset < length_);
return V8Vector<T>(start_ + offset, length_ - offset);
}
private:
T* start_;
int length_;
};
template <typename T, int kSize>
class EmbeddedVector : public V8Vector<T> {
public:
EmbeddedVector() : V8Vector<T>(buffer_, kSize) {}
explicit EmbeddedVector(T initial_value) : V8Vector<T>(buffer_, kSize) {
for (int i = 0; i < kSize; ++i) {
buffer_[i] = initial_value;
}
}
// When copying, make underlying Vector to reference our buffer.
EmbeddedVector(const EmbeddedVector& rhs) : V8Vector<T>(rhs) {
MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
this->set_start(buffer_);
}
EmbeddedVector& operator=(const EmbeddedVector& rhs) {
if (this == &rhs) return *this;
V8Vector<T>::operator=(rhs);
MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
this->set_start(buffer_);
return *this;
}
private:
T buffer_[kSize];
};
// Helper function for printing to a Vector.
static inline int MOZ_FORMAT_PRINTF(2, 3)
SNPrintF(V8Vector<char> str, const char* format, ...) {
va_list args;
va_start(args, format);
int result = vsnprintf(str.start(), str.length(), format, args);
va_end(args);
return result;
}
} // namespace jit
} // namespace js
#endif
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