mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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/*
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Implementation for nsFixedSizeAllocator
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*/
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#include "nsCRT.h"
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#include "nsFixedSizeAllocator.h"
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nsFixedSizeAllocator::Bucket *
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nsFixedSizeAllocator::AddBucket(size_t aSize)
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{
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void* p;
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PL_ARENA_ALLOCATE(p, &mPool, sizeof(Bucket));
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if (! p)
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return nullptr;
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Bucket* bucket = static_cast<Bucket*>(p);
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bucket->mSize = aSize;
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bucket->mFirst = nullptr;
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bucket->mNext = mBuckets;
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mBuckets = bucket;
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return bucket;
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}
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nsresult
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nsFixedSizeAllocator::Init(const char* aName,
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const size_t* aBucketSizes,
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PRInt32 aNumBuckets,
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PRInt32 aInitialSize,
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PRInt32 aAlign)
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{
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NS_PRECONDITION(aNumBuckets > 0, "no buckets");
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if (aNumBuckets <= 0)
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return NS_ERROR_INVALID_ARG;
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// Blow away the old pool if we're being re-initialized.
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if (mBuckets)
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PL_FinishArenaPool(&mPool);
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PRInt32 bucketspace = aNumBuckets * sizeof(Bucket);
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PL_InitArenaPool(&mPool, aName, bucketspace + aInitialSize, aAlign);
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mBuckets = nullptr;
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for (PRInt32 i = 0; i < aNumBuckets; ++i)
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AddBucket(aBucketSizes[i]);
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return NS_OK;
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}
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nsFixedSizeAllocator::Bucket *
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nsFixedSizeAllocator::FindBucket(size_t aSize)
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{
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Bucket** link = &mBuckets;
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Bucket* bucket;
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while ((bucket = *link) != nullptr) {
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if (aSize == bucket->mSize) {
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// Promote to the head of the list, under the assumption
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// that we'll allocate same-sized object contemporaneously.
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*link = bucket->mNext;
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bucket->mNext = mBuckets;
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mBuckets = bucket;
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return bucket;
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}
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link = &bucket->mNext;
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}
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return nullptr;
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}
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void*
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nsFixedSizeAllocator::Alloc(size_t aSize)
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{
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Bucket* bucket = FindBucket(aSize);
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if (! bucket) {
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// Oops, we don't carry that size. Let's fix that.
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bucket = AddBucket(aSize);
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if (! bucket)
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return nullptr;
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}
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void* next;
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if (bucket->mFirst) {
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next = bucket->mFirst;
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bucket->mFirst = bucket->mFirst->mNext;
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}
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else {
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PL_ARENA_ALLOCATE(next, &mPool, aSize);
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if (!next)
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return nullptr;
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}
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#ifdef DEBUG
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memset(next, 0xc8, aSize);
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#endif
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return next;
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}
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void
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nsFixedSizeAllocator::Free(void* aPtr, size_t aSize)
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{
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FreeEntry* entry = reinterpret_cast<FreeEntry*>(aPtr);
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Bucket* bucket = FindBucket(aSize);
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#ifdef DEBUG
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NS_ASSERTION(bucket && bucket->mSize == aSize, "ack! corruption! bucket->mSize != aSize!");
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memset(aPtr, 0xd8, bucket->mSize);
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#endif
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entry->mNext = bucket->mFirst;
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bucket->mFirst = entry;
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}
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