为什么类中的向量自动变为 NULL

我正在创建简单的缓存模型来模拟某些应用程序。

但是，在下面的代码lru中发生了问题。(我没有复制不相关的代码)

主.cpp

int main(void) {
Cache* L1Cache = new Cache(64, 64, 8);
Cache* L2Cache = new Cache(256, 64, 4);
Cache* L3Cache = new Cache(2048, 64, 16); // This object causes problem
Cache* L4Cache = new Cache(2048, 64, 8);
L1Cache->initCache();
L2Cache->initCache();
L3Cache->initCache();
L4Cache->initCache();
return 0;
}

缓存.h

typedef struct CacheLine {
std::vector<uint64_t> data;
}CacheLine;
typedef struct CacheSet {
std::vector<bool> valid;
std::vector<uint64_t> tag;
std::vector<CacheLine> directory;
}CacheSet;
typedef struct LRU {
std::vector<std::vector<bool>> lruMatrix;
}LRU;

class Cache {
public:
Cache(uint32_t cacheSizeInKB, uint32_t lineSizeInByte, uint32_t numOfDirs) {
// set cache size
this->cacheSizeInKB = cacheSizeInKB;
this->lineSizeInByte = lineSizeInByte;
this->numOfDirs = numOfDirs;
this->numOfSets = (cacheSizeInKB * 1024) / (lineSizeInByte * numOfDirs);
// set memory address offset
this->blockOffsetFrom = log2(lineSizeInByte) - 1;
this->blockOffsetTo = 0;
this->indexOffsetFrom = this->blockOffsetFrom + ceil(log2(this->numOfSets));
this->indexOffsetTo = this->blockOffsetFrom + 1;
this->tagOffsetFrom = 63;
this->tagOffsetTo = this->indexOffsetFrom + 1;
// reserve vectors before using
cache.reserve(this->numOfSets);
for (int x = 0; x < this->numOfSets; ++x) {
cache[x].valid.reserve(numOfDirs);
cache[x].tag.reserve(numOfDirs);
cache[x].directory.reserve(numOfDirs);
for (int y = 0; y < this->numOfDirs; ++ y) {
cache[x].directory[y].data.reserve(lineSizeInByte / 8);
}
}
lru.reserve(this->numOfSets);
for (int i = 0; i < this->numOfSets; ++i) {
lru[i].lruMatrix.reserve(numOfDirs);
for (int j = 0; j < this->numOfDirs; ++j) {
lru[i].lruMatrix[j].reserve(numOfDirs);
}
}
std::cout << "1: " << &lru[0].lruMatrix[0] << std::endl;  // this shows correct memory address space
}
void initCache();
void accessData(uint64_t addr);
void printLRUMatrix(uint64_t index);
private:
const uint32_t HIT = 1;
const uint32_t MISS = 0;
// cache size list
uint32_t cacheSizeInKB;
uint32_t lineSizeInByte;
uint32_t numOfDirs;
uint32_t numOfSets;
// offset list
uint64_t blockOffsetFrom;
uint64_t blockOffsetTo;
uint64_t indexOffsetFrom;
uint64_t indexOffsetTo;
uint64_t tagOffsetFrom;
uint64_t tagOffsetTo;
std::vector<CacheSet> cache;
std::vector<LRU> lru;
};

缓存.cpp

void Cache::initCache() {
for (int x = 0; x < numOfSets; ++x) {
for (int i = 0; i < numOfDirs; ++i) {
cache[x].valid[i] = false;
cache[x].tag[i] = 0;
for (int j = 0; j < numOfDirs; ++j)
cache[x].directory[i].data[j] = 0;
}
}
std::cout <<"2: " << &lru[0].lruMatrix[0] << std::endl; // This prints out 0 address in case of L3Cache
/*
for (int i = 0; i < numOfSets; ++i) {
std::cout << "i: " << i << std::endl;
for (int j = 0; j < numOfDirs; ++j) {
std::cout << "j: " << j << std::endl;
for (int k = 0; k < numOfDirs; ++k) {
std::cout << "k: " << k << std::endl;
this->lru[i].lruMatrix[j][k] = false;
}
}
}
*/
}

输出

1: 0x9464d0
1: 0x9f5190
1: 0xded230
1: 0x140d2d0
2: 0x9464d0
2: 0x9f5190
2: 0
2: 0x140d2d0

我从上面的代码中遇到了奇怪的情况。

在 L3Cache 的情况下，lru[0].lruMatrix[0] 的地址在缓存constructor(0xded230) 和成员函数initCache()(0) 之间是不同的。

但是，其他情况(例如L1Cache，L2Cache，L4Cache)在constructor和initCache()之间打印正确(相同)地址。

唯一的区别是L3Cache使用比其他的更大的numOfDir 16。

我不知道为什么会这样。我的代码似乎没有错误。

有什么问题吗？