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assembler.js
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var compileBtn=document.getElementsByClassName("compile")[0];
var orderRes=document.getElementsByClassName("orderRes")[0];
var runBtn=document.getElementsByClassName("run")[0];
var input=document.getElementById("input");
var mcCodeRes=document.getElementsByClassName("mcCode")[0];
var deCompRes=document.getElementsByClassName("deComp")[0];
var clearBtn=document.getElementById("clearBtn");
var regBtn=document.getElementsByClassName("submitReg")[0];
var regInput=document.getElementsByClassName("register");
var pointer=document.getElementsByClassName("pointer")[0];
//--------寄存器类--------
var REGIST={
map:[],
value:[],
isWatch:0,
Register:["$zero", "$at", "$v0", "$v1", "$a0", "$a1", "$a2", "$a3", "$t0",
"$t1", "$t2","$t3","$t4","$t5","$t6","$t7","$s0","$s1","$s2","$s3","$s4","$s5","$s6",
"$s7","$t8","$t9","$k0","$k1","$gp","$sp","$fp","$ra","$pc","$hi","lo"],
init:function(){
REGIST.map=[];
REGIST.value=[];
for(var i in REGIST.Register){
REGIST.map[REGIST.Register[i]]=i;
}
clearInterval(REGIST.isWatch);
REGIST.isWatch=0;
},
saveDefault:function(){
for(var i=0;i< regInput.length;i++){
if(regInput[i].value=="") regInput[i].value=0;
REGIST.value[i]=parseInt(regInput[i].value);
regInput[i].setAttribute("readonly","true");
regInput[i].className+=" readonly";
}
},
watchReg:function(){
clearInterval(REGIST.isWatch);
REGIST.isWatch=setInterval(function(){
for(var i=0;i< regInput.length;i++){
regInput[i].value=parseInt(REGIST.value[i]);
}
},100);
}
};
//--------内存类--------
var RAM={
state:0,
Memory:[],
maxPC:0,
PC:0,
base:0,
process:[],
instruct:[],
init:function(){
var buffer=new ArrayBuffer(65536);//模拟内存空间，共65536bits
var memory=new Uint8Array(buffer);//分配内存块，每个内存块8bits
RAM.Memory=memory;
RAM.maxPC=RAM.base=RAM.PC=0;
RAM.process=[];
RAM.state=1;
RAM.instruct=[];
}
};
//--------编译器类--------
var ASSEM={
isLoop:0,
begin:0,
Run:function(){
REGIST.init();
RAM.init();
ASSEM.begin=ASSEM.isLoop=0;
},
//--------MIPS指令集的三种类型
RType:function(op,rd,rs,rt){
var funcode=rd<<11|rs<<21|rt<<16|op;
return funcode;
},
IType:function(op,rs,rt,immi){
var funcode=rt<<16|rs<<21|op<<26|immi;
return funcode;
},
JType:function(op,target){
var funcode=op<<26|target;
return funcode;
},
//--------输出特定位数(64,32,16,8)的二进制串
getBinary:function(num,bit){
var binaryStr="";
for(var i=0;i<bit;i++){
var tmp=(num>>i) & 1;
binaryStr+=tmp.toString();
}
binaryStr=binaryStr.split("").reverse().join("");
return binaryStr;
},
//--------汇编指令编译为机器码
getMcCode:function(order){
var op, rd, rs, rt, opstr,res,immi;
opstr = order[0].toLowerCase();
rd = REGIST.map[order[1]];
if (opstr == "add" || opstr=="sub") {
if(opstr=="add") op = 1 << 5;
else op=1<<5|1<<1;
rs = REGIST.map[order[2]];
rt = REGIST.map[order[3]];
res = ASSEM.RType(op, rd, rs, rt);
//console.log(getBinary(res));
}
if (opstr == "lw" || opstr == "sw") {
if (opstr == "lw") op = 1 << 5 | 1 << 1 | 1;
else op = 1 << 5 | 1 << 3 | 1 << 1 | 1;
immi = order[2];
rs = REGIST.map[order[3]];
res = ASSEM.IType(op, rs, rd, immi);
//console.log(getBinary(res));
}
if (opstr == "beq") {
op = 1 << 2;
var label = order[3];
immi=RAM.process[label]-RAM.maxPC/4;
rt = REGIST.map[order[2]];
res = ASSEM.IType(op, rd, rt, immi);
//console.log(getBinary(res));
}
if (opstr == "j") {
op = 1 << 1;
var target = order[1];
if(REGIST.Register.indexOf(target)!=-1) immi=REGIST.map[target];
else immi=RAM.process[target];
res = ASSEM.JType(op, immi);
//console.log(getBinary(res));
}
return ASSEM.getBinary(res,32);
},
//--------编译--------
compiler:function(){
ASSEM.Run();
REGIST.watchReg();
REGIST.saveDefault();
mcCodeRes.innerHTML="";
var instruct=input.value.split("\n");
var singleInst=[];
for(var i in instruct){
instruct[i]=instruct[i].trim();
if(instruct[i]=="") continue;
var order = instruct[i].split(/\s+|\,|\(|\)|:/);
for(var j in order){
if(!order[j]) order.splice(j,1);
}
var opstr=order[0].toLowerCase();
if(opstr!="add" && opstr!="sub" && opstr!="lw" && opstr!="sw" && opstr!="beq" && opstr!="j"){
opstr=opstr.substring(0,opstr.length);
RAM.process[opstr]=i;
order.splice(0,1);
}
singleInst.push(order);
}
//console.log(singleInst);
for(var i in singleInst) {
var machineCode=ASSEM.getMcCode(singleInst[i]);
var high=machineCode.substring(0,8),
highMid=machineCode.substring(8,16),
lowMid=machineCode.substring(16,24),
low=machineCode.substring(24,32);
RAM.Memory[RAM.maxPC]=parseInt(low,2);
RAM.Memory[RAM.maxPC+1]=parseInt(lowMid,2);
RAM.Memory[RAM.maxPC+2]=parseInt(highMid,2);
RAM.Memory[RAM.maxPC+3]=parseInt(high,2);
RAM.maxPC+=4;
//console.log(machineCode);
mcCodeRes.innerHTML+=machineCode+"<br>"
}
//console.log(RAM.Memory);
ASSEM.decompiler();
},
//--------执行--------
runPro:function(){
var rflag=true;
ASSEM.compiler();
while(RAM.PC < RAM.maxPC && rflag){
var IR,op,rs,rt,rd,fun,Iimmi,Jimmi;
IR=(RAM.Memory[RAM.PC])|(RAM.Memory[RAM.PC+1]<<8)|(RAM.Memory[RAM.PC+2]<<16)|(RAM.Memory[RAM.PC+3]<<24);
op=(IR>>26)&63;
rs=(IR>>21)&31;
rt=(IR>>16)&31;
rd=(IR>>11)&31;
fun=IR&63;
Iimmi=IR&0xFFFF;
Jimmi=(IR&0x3FFFFFF)<<2;
switch(op){
case 0://R-type
switch(fun){
case 32://ADD
REGIST.value[rd]=REGIST.value[rs]+REGIST.value[rt];
break;
case 34://SUB
REGIST.value[rd]=REGIST.value[rs]-REGIST.value[rt];
break;
}
break;
case 35://LW
REGIST.value[rt]=(RAM.Memory[rs+Iimmi+0])|(RAM.Memory[rs+Iimmi+1]<<8)|
(RAM.Memory[rs+Iimmi+2]<<16)|(RAM.Memory[rs+Iimmi+3]<<24);
break;
case 43://SW
RAM.Memory[rs+Iimmi+0]=(REGIST.value[rt])&0xFF;
RAM.Memory[rs+Iimmi+1]=(REGIST.value[rt]>>8)&0xFF;
RAM.Memory[rs+Iimmi+2]=(REGIST.value[rt]>>16)&0xFF;
RAM.Memory[rs+Iimmi+3]=(REGIST.value[rt]>>24)&0xFF;
break;
case 4://BEQ
if(REGIST.value[rs]==REGIST.value[rt]){
RAM.PC+=(Iimmi<<2)-4;
}
break;
case 2://J
RAM.PC=(RAM.PC & 0xF0000000 | Jimmi)-4;
break;
default:
console.error("Instruction Error!");
rflag=false;
break;
}
//console.log(instruct[i]);
//deCompRes.innerHTML+=instruct[i]+"<br>";
RAM.PC+=4;
ASSEM.isLoop++;
if(ASSEM.isLoop>=10000000) return alert("Trapped in loop!Error!");
}
alert("run completed!");
},
//--------反编译--------
decompiler:function(){
deCompRes.innerHTML="";
var instruct=[];
for (var i=0;i<RAM.maxPC;i+=4){
var IR,op,rs,rt,rd,fun,Iimmi,Jimmi;
IR=(RAM.Memory[i])|(RAM.Memory[i+1]<<8)|(RAM.Memory[i+2]<<16)|(RAM.Memory[i+3]<<24);
op=(IR>>26)&63;
rs=(IR>>21)&31;
rt=(IR>>16)&31;
rd=(IR>>11)&31;
fun=IR&63;
Iimmi=IR&0xFFFF;
Jimmi=(IR&0x3FFFFFF);
switch(op){
case 0://R-type
switch(fun){
case 32://ADD
instruct[i]="ADD ";
instruct[i]+=REGIST.Register[rd]+","+REGIST.Register[rs]+","+REGIST.Register[rt];
break;
case 34://SUB
instruct[i]="SUB ";
instruct[i]+=REGIST.Register[rd]+","+REGIST.Register[rs]+","+REGIST.Register[rt];
break;
}
break;
case 35://LW
instruct[i]="LW ";
instruct[i]+=REGIST.Register[rt]+","+Iimmi+"("+REGIST.Register[rs]+")";
break;
case 43://SW
instruct[i]="SW ";
instruct[i]+=REGIST.Register[rt]+","+Iimmi+"("+REGIST.Register[rs]+")";
break;
case 4://BEQ
instruct[i]="BEQ ";
instruct[i]+=REGIST.Register[rs]+","+REGIST.Register[rt]+","+Iimmi;
break;
case 2://J
instruct[i]="J ";
instruct[i]+=Jimmi;
break;
default:
console.error("Instruction Error!");
break;
}
//console.log(instruct[i]);
deCompRes.innerHTML+=instruct[i]+"<br>";
}
RAM.instruct=instruct;
}
};
compileBtn.addEventListener("click",ASSEM.compiler);
runBtn.addEventListener("click",ASSEM.runPro);
regBtn.addEventListener("click",function(){
if(REGIST.isWatch) return alert("已保存");
REGIST.saveDefault();
alert("保存成功!")
});
clearBtn.addEventListener("click",function(){
mcCodeRes.innerHTML="";
deCompRes.innerHTML="";
orderRes.innerHTML="";
pointer.style.display="none";
for(var i=0;i< regInput.length;i++){
regInput[i].removeAttribute("readonly");
regInput[i].className="register";
regInput[i].value=0;
}
clearInterval(REGIST.isWatch);
REGIST.isWatch=0;
});