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397 lines (368 loc) · 13.3 KB
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//
// VM.cpp
// Assembler
//
// Created by GregMac on 10/30/14.
// Copyright (c) 2014 Mac. All rights reserved.
//
#include "VM.h"
#include <thread>
RawData VirtualMachine::registers[13];
WordData VirtualMachine::fetch;
char* VirtualMachine::mem;
bool VirtualMachine::threadpool[THREAD_MAX];
int VirtualMachine::currentThreadID;
ofstream VirtualMachine::log;
ofstream VirtualMachine::contextLog;
bool VirtualMachine::exeLog;
int VirtualMachine::memSize;
int VirtualMachine::totalStackSpace;
int VirtualMachine::heapStart;
VirtualMachine::VirtualMachine(char * m, int heapStart, int size)
{
//memory to be processed by vm
mem = m;
//assign dimensions for stack space
this->heapStart = heapStart;
//store stack space count before partitioned by threads
totalStackSpace = size - heapStart;
memSize = size;
//set up the IR fetched instructions
fetch = WordData();
}
int VirtualMachine::getAvailableThread()
{
int threadId = -1;
for(int i=0;i<THREAD_MAX && threadId < 0;++i)
{
if(!threadpool[i])
{
threadId = i;
threadpool[i] = true;
}
}
return threadId;
}
void VirtualMachine::ContextSwitch()
{
int oldId = currentThreadID;
bool switched = false;
for(int i=currentThreadID+1;i<THREAD_MAX && ! switched;++i)
{
if(threadpool[i])
{
currentThreadID= i;
switched = true;
}
}
for(int i=0;i<currentThreadID && ! switched;++i)
{
if(threadpool[i])
{
currentThreadID= i;
switched = true;
}
}
//change register context if a switch was made
if(switched)
{
/*contextLog<<endl;
contextLog<<"Switching from "<<oldId<<" to "<< currentThreadID<<endl;*/
//write old context
int oldbase = memSize - (totalStackSpace/THREAD_MAX * oldId);
int reg = 0;
for(int i = 0;i<REGISTER_COUNT; i++)
{
int offset = oldbase - ((i+1) * REGISTER_SIZE);
int num = registers[i].num;
//contextLog<<oldId<<"~"<<offset<<": "<<num<<endl;
memcpy(mem + offset,reinterpret_cast<char*>(&num),REGISTER_SIZE);
}
//read new context
int base = memSize - (totalStackSpace/THREAD_MAX * currentThreadID);
reg = 0;
for(int i = 0;i<REGISTER_COUNT; i++)
{
int offset = base - ((i+1) * REGISTER_SIZE);
registers[i].num = *reinterpret_cast<int*>(mem+offset);
// contextLog<<currentThreadID<<"~"<<offset<<": "<< registers[i].num <<endl;
}
/* contextLog<<"Assigning context to: "<<currentThreadID<<endl;
for(int i=0;i<REGISTER_COUNT;i++)
{
contextLog<<"R"<<i<<": "<<registers[i].num<<endl;
}*/
}
}
void VirtualMachine::AssignThreadConext(int threadId, int pc, bool copyRegisters)
{
int base = memSize - (totalStackSpace/THREAD_MAX * threadId);
int regularRegisterLimit = base - REGISTER_SIZE*8;
int reg = 0;
int sl;// = registers[9].num;
int sp;// = registers[10].num;
int fp;// = registers[11].num;
int sb;// = registers[12].num;
//contextLog<<endl;
//contextLog<<"Assigning context to: "<<threadId<<endl;
/*for(int i=0;i<REGISTER_COUNT;i++)
{
contextLog<<"R"<<i<<": "<<registers[i].num<<endl;
}*/
//make initial registers in context = 0
for(int i = base ;i>regularRegisterLimit; i -= REGISTER_SIZE)
{
int num = copyRegisters?registers[reg++].num:0;
// contextLog<<i - REGISTER_SIZE<< ": " << num << endl;
memcpy(mem + i -REGISTER_SIZE,reinterpret_cast<char*>(&num),REGISTER_SIZE);
}
int stackiterator = base - REGISTER_SIZE*9;
//copy PC in
memcpy(mem + stackiterator,reinterpret_cast<char*>(&pc),REGISTER_SIZE);
//contextLog<<stackiterator<< ": " << *reinterpret_cast<int*>(mem+stackiterator) << endl;
stackiterator -= REGISTER_SIZE;
sl = base - totalStackSpace/THREAD_MAX;
memcpy(mem + stackiterator,reinterpret_cast<char*>(&sl),REGISTER_SIZE);
//contextLog<<stackiterator<< ": " << *reinterpret_cast<int*>(mem+stackiterator) << endl;
stackiterator -= REGISTER_SIZE;
sp = base - REGISTER_COUNT*REGISTER_SIZE;
memcpy(mem + stackiterator,reinterpret_cast<char*>(&sp),REGISTER_SIZE);
//contextLog<<stackiterator<< ": " << *reinterpret_cast<int*>(mem+stackiterator) << endl;
stackiterator -= REGISTER_SIZE;
fp = sp;
memcpy(mem + stackiterator,reinterpret_cast<char*>(&fp),REGISTER_SIZE);
//contextLog<<stackiterator<< ": " << *reinterpret_cast<int*>(mem+stackiterator) << endl;
sb = fp;
stackiterator -= REGISTER_SIZE;
memcpy(mem + stackiterator,reinterpret_cast<char*>(&sb),REGISTER_SIZE);
//contextLog<<stackiterator<< ": " << *reinterpret_cast<int*>(mem+stackiterator) << endl;
}
void VirtualMachine::Run(int start)
{
if (exeLog)
log = ofstream("VMlog.txt", ofstream::out);
//contextLog = ofstream("contextlog.txt", ofstream::out);
int mainThread = getAvailableThread();
AssignThreadConext(mainThread, 0, false);
RunThread(0, mainThread);
//thread t = thread(VirtualMachine::RunThread,start,mainThread);
//t.join();
}
void VirtualMachine::RunThread(int start,int tId)
{
bool running = true;
//make aliases for special registers
int& PC = registers[8].num;
int& SL = registers[9].num;
int& SP = registers[10].num;
int& FP = registers[11].num;
int& SB = registers[12].num;
//assign references to fetch arguments
int& instructionCode = fetch.InstructionCode.num;
int& destArg = fetch.DestArg.num;
int& srcArg = fetch.SourceArg.num;
int base = memSize - (totalStackSpace/THREAD_MAX * currentThreadID);
for(int i = 0;i<REGISTER_COUNT; i++)
{
int offset = base - ((i+1) * REGISTER_SIZE);
registers[i].num = *reinterpret_cast<int*>(mem+offset);
contextLog<<currentThreadID<<"~"<<offset<<": "<< registers[i].num <<endl;
}
while(running) {
//do round robin context switch each cycle
ContextSwitch();
fetch = *reinterpret_cast<WordData*>(mem + PC);
if(exeLog)//output data for debugging and logging
{
log<<"PC-"<<currentThreadID<<"~"<<PC<<": "<<instructionCode<<"\t"<<destArg<<"\t"<<srcArg<<endl;
log<<endl;
log<<"R0: "<<registers[0].num<<endl;
log<<"R1: "<<registers[1].num<<endl;
log<<"R2: "<<registers[2].num<<endl;
log<<"R3: "<<registers[3].num<<endl;
log<<"R4: "<<registers[4].num<<endl;
log<<"R5: "<<registers[5].num<<endl;
log<<"R6: "<<registers[6].num<<endl;
log<<"R7: "<<registers[7].num<<endl;
log<<"SP: "<<SP<<endl;
log<<"FP: "<<FP<<endl;
log<<"SB: "<<SB<<endl;
log<<"SL: "<<SL<<"\n"<<endl;
}
PC+= 12;
RawData raw1 = RawData();
switch(instructionCode) {
case ADD:
registers[destArg].num += registers[srcArg].num ;
break;
case ADI:
registers[destArg].num += srcArg;
break;
case MUL:
registers[destArg].num *= registers[srcArg].num;
break;
case DIV:
registers[destArg].num = registers[srcArg].num/registers[destArg].num;
break;
case SUB:
registers[destArg].num = registers[srcArg].num - registers[destArg].num;
break;
case MOV:
memcpy(registers+destArg,registers+srcArg,WORDSIZE);
break;
case LDR:
memcpy(registers+destArg,mem+ srcArg,WORDSIZE);
break;
case JMP:
PC = destArg-12;
break;
case JMR:
PC = registers[destArg].num;
break;
case CMP: //same as subtract
registers[destArg].num = registers[srcArg].num - registers[destArg].num;
break;
case LDB :
registers[destArg].num = 0;
registers[destArg].byte = mem[srcArg];
break;
case STB:
for(int i =0;i<7;++i)
mem[srcArg] = registers[destArg].byte;
break;
case LDA:
memcpy(registers+destArg, &srcArg,WORDSIZE);
break;
case AND:
if(registers[srcArg].num==0)
registers[destArg].num = 0;
break;
case BRZ:
raw1.num = *reinterpret_cast<int*>(registers+destArg);
if(raw1.num == 0)
{
PC = srcArg-12;
}
break;
case BNZ:
raw1.num = *reinterpret_cast<int*>(registers+destArg);
if(raw1.num != 0)
{
PC = srcArg-12;
}
break;
case BGT:
if(registers[destArg].num > 0)
{
PC = srcArg-12;
}
break;
case BLT:
raw1.num = *reinterpret_cast<int*>(registers+destArg);
if(raw1.num < 0)
{
PC = srcArg-12;
}
break;
case STR:
memcpy(mem+srcArg,registers+destArg,WORDSIZE);
break;
case LDRI:
srcArg = *reinterpret_cast<int*>(®isters[srcArg]); //indirect part
memcpy(registers+destArg,mem+srcArg,WORDSIZE);
break;
case LDBI:
srcArg = *reinterpret_cast<int*>(®isters[srcArg]); //indirect part
raw1.num = 0;
raw1.byte = mem[srcArg];
memcpy(registers+destArg, raw1.bytes,WORDSIZE);
break;
case STRI:
srcArg = *reinterpret_cast<int*>(®isters[srcArg]); //indirect part
memcpy(mem+srcArg,registers+destArg,WORDSIZE);
break;
case STBI:
srcArg = *reinterpret_cast<int*>(®isters[srcArg]); //indirect part
mem[srcArg] = registers[destArg].byte;
break;
case RUN:
destArg = getAvailableThread();
if(destArg > -1)
AssignThreadConext(destArg, srcArg-12, true);
else
throw runtime_error("Error: Exceeded thread maximum: " + THREAD_MAX);
break;
case END:
if(currentThreadID >0)
threadpool[currentThreadID] = false;
break;
case BLK:
if(currentThreadID==0)
{
bool onlyThread = true;
for(int i=1; i <THREAD_MAX && onlyThread;++i)
{
onlyThread = !(threadpool[i]);
}
if(!onlyThread)
PC -= 12;
}
break;
case LCK:
srcArg = *reinterpret_cast<int*>(&mem[destArg]);
if(srcArg==-1)
{
memcpy(mem+destArg, reinterpret_cast<char*>(¤tThreadID), 4);
}
else{
PC -= 12; //repeat until lock is resolved
}
break;
case ULK:
srcArg = *reinterpret_cast<int*>(&mem[destArg]);
if(srcArg==currentThreadID)
{
srcArg =-1;
memcpy(mem+destArg, reinterpret_cast<char*>(&srcArg), 4);
}
break;
case TRP:
switch (destArg)
{
case 0:
running = false;
break;
case 1:
cout<< *reinterpret_cast<int*>(registers)<<flush;
break;
case 2:
cin >> registers[0].num;
break;
case 3:
cout << registers[0].byte << flush;
break;
case 4:
registers[0].num = 0;
registers[0].byte = getchar();
break;
case 99://debug dump
cout<<"PC: "<<PC<<endl;
cout<<endl;
cout<<"R0: "<<registers[0].num<<endl;
cout<<"R1: "<<registers[1].num<<endl;
cout<<"R2: "<<registers[2].num<<endl;
cout<<"R3: "<<registers[3].num<<endl;
cout<<"R4: "<<registers[4].num<<endl;
cout<<"R5: "<<registers[5].num<<endl;
cout<<"R6: "<<registers[6].num<<endl;
cout<<"R7: "<<registers[7].num<<"\n"<<endl;
default:
break;
}
break;
default:
throw runtime_error("Unexecutable instruction occured: " + to_string(fetch.InstructionCode.num));
break;
}
}
}