mirror of
https://github.com/classilla/tenfourfox.git
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100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jit_FixedList_h
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#define jit_FixedList_h
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#include <stddef.h>
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#include "jit/Ion.h"
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#include "jit/JitAllocPolicy.h"
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namespace js {
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namespace jit {
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// List of a fixed length, but the length is unknown until runtime.
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template <typename T>
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class FixedList
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{
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T* list_;
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size_t length_;
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private:
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FixedList(const FixedList&); // no copy definition.
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void operator= (const FixedList*); // no assignment definition.
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public:
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FixedList()
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: list_(nullptr), length_(0)
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{ }
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// Dynamic memory allocation requires the ability to report failure.
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bool init(TempAllocator& alloc, size_t length) {
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length_ = length;
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if (length == 0)
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return true;
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size_t bytes;
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if (MOZ_UNLIKELY(!CalculateAllocSize<T>(length, &bytes)))
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return false;
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list_ = (T*)alloc.allocate(bytes);
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return list_ != nullptr;
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}
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size_t empty() const {
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return length_ == 0;
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}
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size_t length() const {
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return length_;
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}
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void shrink(size_t num) {
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MOZ_ASSERT(num < length_);
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length_ -= num;
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}
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bool growBy(TempAllocator& alloc, size_t num) {
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size_t newlength = length_ + num;
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if (newlength < length_)
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return false;
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size_t bytes;
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if (MOZ_UNLIKELY(!CalculateAllocSize<T>(newlength, &bytes)))
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return false;
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T* list = (T*)alloc.allocate(bytes);
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if (MOZ_UNLIKELY(!list))
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return false;
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for (size_t i = 0; i < length_; i++)
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list[i] = list_[i];
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length_ += num;
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list_ = list;
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return true;
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}
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T& operator[](size_t index) {
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MOZ_ASSERT(index < length_);
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return list_[index];
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}
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const T& operator [](size_t index) const {
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MOZ_ASSERT(index < length_);
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return list_[index];
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}
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T* begin() {
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return list_;
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}
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T* end() {
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return list_ + length_;
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}
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};
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} // namespace jit
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} // namespace js
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#endif /* jit_FixedList_h */
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