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csim.c
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csim.c
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#include "cachelab.h"
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <getopt.h>
#include <stdlib.h>
#define MAGIC_LRU_NUM 999
typedef struct{
int valid; //有效位
int tag; //标识位
int LruNumber; //LRU算法需要位
} Line;
typedef struct{
Line* lines; //一组中所有的行
} Set;
typedef struct {
int set_num; //组数
int line_num; //行数
Set* sets; //模拟cache
} Sim_Cache;
void printHelpMenu(); //打印Help帮助文档
void checkOptarg(char *curOptarg); //检查参数是否非法,初步检测是否是‘-’开头参数
int get_Opt(int argc,char **argv,int *s,int *E,int *b,char *tracefileName,int *isVerbose); //读取用户输入参数
void init_SimCache(int s,int E,int b,Sim_Cache *cache); //初始化模拟缓存
int getSet(int addr,int s,int b); //得到组号
int getTag(int addr,int s,int b); //得到标记
void loadData(Sim_Cache *sim_cache,int addr,int size,int setBits,int tagBits ,int isVerbose); //得到标记号
void storeData(Sim_Cache *sim_cache,int addr,int size,int setBits,int tagBits ,int isVerbose); //得到标记号
void modifyData(Sim_Cache *sim_cache,int addr,int size,int setBits,int tagBits ,int isVerbose); //得到标记号
int misses;
int hits;
int evictions;
int main(int argc,char **argv){
int s,E,b,isVerbose=0;
char tracefileName[100],opt[10];
int addr,size;
misses = hits = evictions =0;
Sim_Cache cache;
get_Opt(argc,argv,&s,&E,&b,tracefileName,&isVerbose);
init_SimCache(s,E,b,&cache);
FILE *tracefile = fopen(tracefileName,"r");
while(fscanf(tracefile,"%s %x,%d",opt,&addr,&size) != EOF){
if(strcmp(opt,"I")==0)continue;
int setBits = getSet(addr,s,b);
int tagBits = getTag(addr,s,b);
// printf("----------------------------------\n");
// printf("setBits:%x tagBits:%x\n",setBits,tagBits);
if(isVerbose == 1) printf("%s %x,%d ",opt,addr,size);
if(strcmp(opt,"S")==0) {
storeData(&cache,addr,size,setBits,tagBits,isVerbose);
}
if(strcmp(opt,"M")==0) {
modifyData(&cache,addr,size,setBits,tagBits,isVerbose);
}
if(strcmp(opt,"L")==0) {
loadData(&cache,addr,size,setBits,tagBits,isVerbose);
}
if(isVerbose == 1) printf("\n");
}
printSummary(hits,misses,evictions);
return 0;
}
/*获取地址中的组号*/
int getSet(int addr,int s,int b){
addr = addr >> b;
int mask = (1<<s)-1;
return addr &mask;
}
/*获取地址中的标识号*/
int getTag(int addr,int s,int b){
int mask = s+b;
return addr >> mask;
}
/*查找某组中当前最小的LruNumber行,作为牺牲行 */
int findMinLruNumber(Sim_Cache *sim_cache,int setBits){
int i;
int minIndex=0;
int minLru = MAGIC_LRU_NUM;
for(i=0;i<sim_cache->line_num;i++){
if(sim_cache->sets[setBits].lines[i].LruNumber < minLru){
minIndex = i;
minLru = sim_cache->sets[setBits].lines[i].LruNumber;
}
}
return minIndex;
}
/*更新Lru,hit的为最大的MAGIC_LRU_NUM,其他LRU均减一*/
void updateLruNumber(Sim_Cache *sim_cache,int setBits,int hitIndex){
sim_cache->sets[setBits].lines[hitIndex].LruNumber = MAGIC_LRU_NUM;
int j;
for(j=0;j<sim_cache->line_num;j++){//更新其他行的LruNumber
if(j!=hitIndex) sim_cache->sets[setBits].lines[j].LruNumber--;
}
}
/*判断是否命中*/
int isMiss(Sim_Cache *sim_cache,int setBits,int tagBits){
int i;
int isMiss = 1;
for(i=0;i<sim_cache->line_num;i++){
if(sim_cache->sets[setBits].lines[i].valid == 1 && sim_cache->sets[setBits].lines[i].tag == tagBits){
isMiss = 0;
updateLruNumber(sim_cache,setBits,i);
}
}
return isMiss;
}
/*更新内存数据*/
int updateCache(Sim_Cache *sim_cache,int setBits,int tagBits){
int i;
int isfull = 1;
for(i=0;i<sim_cache->line_num;i++){
if(sim_cache->sets[setBits].lines[i].valid == 0){
isfull = 0; //该组未满
break;
}
}
if(isfull == 0){
sim_cache->sets[setBits].lines[i].valid = 1;
sim_cache->sets[setBits].lines[i].tag = tagBits;
updateLruNumber(sim_cache,setBits,i);
}else{
//组已经满,需要牺牲行
int evictionIndex = findMinLruNumber(sim_cache,setBits);
sim_cache->sets[setBits].lines[evictionIndex].valid = 1;
sim_cache->sets[setBits].lines[evictionIndex].tag = tagBits;
updateLruNumber(sim_cache,setBits,evictionIndex);
}
return isfull;
}
void loadData(Sim_Cache *sim_cache,int addr,int size,int setBits,int tagBits ,int isVerbose){
if(isMiss(sim_cache,setBits,tagBits)==1){ //没有命中
misses++;
if(isVerbose == 1) printf("miss ");
if(updateCache(sim_cache,setBits,tagBits) == 1){//该组已满,需要牺牲行
evictions++;
if(isVerbose==1) printf("eviction ");
}
}else{ //命中
hits++;
if(isVerbose == 1) printf("hit ");
}
}
void storeData(Sim_Cache *sim_cache,int addr,int size,int setBits,int tagBits ,int isVerbose){
loadData(sim_cache,addr,size,setBits,tagBits,isVerbose);
}
void modifyData(Sim_Cache *sim_cache,int addr,int size,int setBits,int tagBits ,int isVerbose){
loadData(sim_cache,addr,size,setBits,tagBits,isVerbose);
storeData(sim_cache,addr,size,setBits,tagBits,isVerbose);
}
/*初始化模拟内存*/
void init_SimCache(int s,int E,int b,Sim_Cache *cache){
if(s < 0){
printf("invaild cache sets number\n!");
exit(0);
}
cache->set_num = 2 << s; //2^s 组
cache->line_num = E;
cache->sets = (Set *)malloc(cache->set_num * sizeof(Set));
if(!cache->sets){
printf("Set Memory error\n");
exit(0);
}
int i ,j;
for(i=0; i< cache->set_num; i++)
{
cache->sets[i].lines = (Line *)malloc(E*sizeof(Line));
if(!cache->sets){
printf("Line Memory error\n");
exit(0);
}
for(j=0; j < E; j++){
cache->sets[i].lines[j].valid = 0;
cache->sets[i].lines[j].LruNumber = 0;
}
}
return ;
}
/*分析输入参数*/
int get_Opt(int argc,char **argv,int *s,int *E,int *b,char *tracefileName,int *isVerbose){
int c;
while((c = getopt(argc,argv,"hvs:E:b:t:"))!=-1)
{
switch(c)
{
case 'v':
*isVerbose = 1;
break;
case 's':
checkOptarg(optarg);
*s = atoi(optarg);
break;
case 'E':
checkOptarg(optarg);
*E = atoi(optarg);
break;
case 'b':
checkOptarg(optarg);
*b = atoi(optarg);
break;
case 't':
checkOptarg(optarg);
strcpy(tracefileName,optarg);
break;
case 'h':
default:
printHelpMenu();
exit(0);
}
}
return 1;
}
/*打印帮助文档*/
void printHelpMenu(){
printf("Usage: ./csim-ref [-hv] -s <num> -E <num> -b <num> -t <file>\n");
printf("Options:\n");
printf("-h Print this help message.\n");
printf("-v Optional verbose flag.\n");
printf("-s <num> Number of set index bits.\n");
printf("-E <num> Number of lines per set.\n");
printf("-b <num> Number of block offset bits.\n");
printf("-t <file> Trace file.\n\n\n");
printf("Examples:\n");
printf("linux> ./csim -s 4 -E 1 -b 4 -t traces/yi.trace\n");
printf("linux> ./csim -v -s 8 -E 2 -b 4 -t traces/yi.trace\n");
}
/*检查参数合法性*/
void checkOptarg(char *curOptarg){
if(curOptarg[0]=='-'){
printf("./csim :Missing required command line argument\n");
printHelpMenu();
exit(0);
}
}