void operator()(int) const {
        TestBlock blocks[ITERS];

        for (int i=0; i<ITERS; i++) {
            blocks[i].idx = BackRefIdx::newBackRef(/*largeObj=*/false);
            setBackRef(blocks[i].idx, &blocks[i].data);
        }
        for (int i=0; i<ITERS; i++)
            ASSERT((Block*)&blocks[i].data == getBackRef(blocks[i].idx), NULL);
        for (int i=ITERS-1; i>=0; i--)
            removeBackRef(blocks[i].idx);
    }
Exemplo n.º 2
0
void *ExtMemoryPool::mallocLargeObject(size_t size, size_t alignment)
{
    size_t headersSize = sizeof(LargeMemoryBlock)+sizeof(LargeObjectHdr);
    // TODO: take into account that they are already largeObjectAlignment-aligned
    size_t allocationSize = alignUp(size+headersSize+alignment, largeBlockCacheStep);

    if (allocationSize < size) // allocationSize is wrapped around after alignUp
        return NULL;

    LargeMemoryBlock* lmb = loc.get(this, allocationSize);
    if (!lmb) {
        BackRefIdx backRefIdx = BackRefIdx::newBackRef(/*largeObj=*/true);
        if (backRefIdx.isInvalid())
            return NULL;

        // unalignedSize is set in getLargeBlock
        lmb = backend.getLargeBlock(allocationSize);
        if (!lmb) {
            removeBackRef(backRefIdx);
            return NULL;
        }
        lmb->backRefIdx = backRefIdx;
        STAT_increment(getThreadId(), ThreadCommonCounters, allocNewLargeObj);
    }

    void *alignedArea = (void*)alignUp((uintptr_t)lmb+headersSize, alignment);
    LargeObjectHdr *header = (LargeObjectHdr*)alignedArea-1;
    header->memoryBlock = lmb;
    header->backRefIdx = lmb->backRefIdx;
    setBackRef(header->backRefIdx, header);

    lmb->objectSize = size;

    MALLOC_ASSERT( isLargeObject(alignedArea), ASSERT_TEXT );
    return alignedArea;
}
void TestObjectRecognition() {
    size_t headersSize = sizeof(LargeMemoryBlock)+sizeof(LargeObjectHdr);
    unsigned falseObjectSize = 113; // unsigned is the type expected by getObjectSize
    size_t obtainedSize;

    ASSERT(sizeof(BackRefIdx)==4, "Unexpected size of BackRefIdx");
    ASSERT(getObjectSize(falseObjectSize)!=falseObjectSize, "Error in test: bad choice for false object size");

    void* mem = scalable_malloc(2*slabSize);
    ASSERT(mem, "Memory was not allocated");
    Block* falseBlock = (Block*)alignUp((uintptr_t)mem, slabSize);
    falseBlock->objectSize = falseObjectSize;
    char* falseSO = (char*)falseBlock + falseObjectSize*7;
    ASSERT(alignDown(falseSO, slabSize)==(void*)falseBlock, "Error in test: false object offset is too big");

    void* bufferLOH = scalable_malloc(2*slabSize + headersSize);
    ASSERT(bufferLOH, "Memory was not allocated");
    LargeObjectHdr* falseLO = 
        (LargeObjectHdr*)alignUp((uintptr_t)bufferLOH + headersSize, slabSize);
    LargeObjectHdr* headerLO = (LargeObjectHdr*)falseLO-1;
    headerLO->memoryBlock = (LargeMemoryBlock*)bufferLOH;
    headerLO->memoryBlock->unalignedSize = 2*slabSize + headersSize;
    headerLO->memoryBlock->objectSize = slabSize + headersSize;
    headerLO->backRefIdx = BackRefIdx::newBackRef(/*largeObj=*/true);
    setBackRef(headerLO->backRefIdx, headerLO);
    ASSERT(scalable_msize(falseLO) == slabSize + headersSize,
           "Error in test: LOH falsification failed");
    removeBackRef(headerLO->backRefIdx);

    const int NUM_OF_IDX = BR_MAX_CNT+2;
    BackRefIdx idxs[NUM_OF_IDX];
    for (int cnt=0; cnt<2; cnt++) {
        for (int master = -10; master<10; master++) {
            falseBlock->backRefIdx.master = (uint16_t)master;
            headerLO->backRefIdx.master = (uint16_t)master;
        
            for (int bl = -10; bl<BR_MAX_CNT+10; bl++) {
                falseBlock->backRefIdx.offset = (uint16_t)bl;
                headerLO->backRefIdx.offset = (uint16_t)bl;

                for (int largeObj = 0; largeObj<2; largeObj++) {
                    falseBlock->backRefIdx.largeObj = largeObj;
                    headerLO->backRefIdx.largeObj = largeObj;

                    obtainedSize = safer_scalable_msize(falseSO, NULL);
                    ASSERT(obtainedSize==0, "Incorrect pointer accepted");
                    obtainedSize = safer_scalable_msize(falseLO, NULL);
                    ASSERT(obtainedSize==0, "Incorrect pointer accepted");
                }
            }
        }
        if (cnt == 1) {
            for (int i=0; i<NUM_OF_IDX; i++)
                removeBackRef(idxs[i]);
            break;
        }
        for (int i=0; i<NUM_OF_IDX; i++) {
            idxs[i] = BackRefIdx::newBackRef(/*largeObj=*/false);
            setBackRef(idxs[i], NULL);
        }
    }
    char *smallPtr = (char*)scalable_malloc(falseObjectSize);
    obtainedSize = safer_scalable_msize(smallPtr, NULL);
    ASSERT(obtainedSize==getObjectSize(falseObjectSize), "Correct pointer not accepted?");
    scalable_free(smallPtr);

    obtainedSize = safer_scalable_msize(mem, NULL);
    ASSERT(obtainedSize>=2*slabSize, "Correct pointer not accepted?");
    scalable_free(mem);
    scalable_free(bufferLOH);
}