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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef jit_FixedList_h
#define jit_FixedList_h
#include <stddef.h>
#include "jit/Ion.h"
#include "jit/JitAllocPolicy.h"
namespace js {
namespace jit {
// List of a fixed length, but the length is unknown until runtime.
template <typename T>
class FixedList
{
T* list_;
size_t length_;
private:
FixedList(const FixedList&); // no copy definition.
void operator= (const FixedList*); // no assignment definition.
public:
FixedList()
: list_(nullptr), length_(0)
{ }
// Dynamic memory allocation requires the ability to report failure.
MOZ_MUST_USE bool init(TempAllocator& alloc, size_t length) {
if (length == 0)
return true;
size_t bytes;
if (MOZ_UNLIKELY(!CalculateAllocSize<T>(length, &bytes)))
return false;
list_ = (T*)alloc.allocate(bytes);
if (!list_)
return false;
length_ = length;
return true;
}
size_t empty() const {
return length_ == 0;
}
size_t length() const {
return length_;
}
void shrink(size_t num) {
MOZ_ASSERT(num < length_);
length_ -= num;
}
MOZ_MUST_USE bool growBy(TempAllocator& alloc, size_t num) {
size_t newlength = length_ + num;
if (newlength < length_)
return false;
size_t bytes;
if (MOZ_UNLIKELY(!CalculateAllocSize<T>(newlength, &bytes)))
return false;
T* list = (T*)alloc.allocate(bytes);
if (MOZ_UNLIKELY(!list))
return false;
for (size_t i = 0; i < length_; i++)
list[i] = list_[i];
length_ += num;
list_ = list;
return true;
}
T& operator[](size_t index) {
MOZ_ASSERT(index < length_);
return list_[index];
}
const T& operator [](size_t index) const {
MOZ_ASSERT(index < length_);
return list_[index];
}
T* data() {
return list_;
}
T* begin() {
return list_;
}
T* end() {
return list_ + length_;
}
};
} // namespace jit
} // namespace js
#endif /* jit_FixedList_h */
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