asmmanager.cpp

mini mips 小型mips软件

#include "StdAfx.h"
#include "AsmManager.h"
#include "CompilingErrorException.h"
#include <sstream>
#include <iostream>
#include <iomanip>
#include <ctype.h>

bool AsmManager::GetWord(istringstream& iss, string &word){
	word = "";
	if (iss.eof()) return false;
	char ch;
	while(iss.get(ch) && (ch ==',' || isspace(ch) || ch == '(' || ch == ')' || ch == '#')){
		if (ch == '#') while (iss.get(ch) && ch != '\n');
	}
	if (iss.eof()) return false;
	do{
		word += ch;
	}while(iss.get(ch) && ch != ',' && ch != '(' && ch != ')' && !isspace(ch));
	//if (!word.empty() && word[0] == '#') while (iss.get(ch) && ch != '\'n') word += ch;
	//cout << word << "\t" << word.size() << "\t" <<word.empty() << endl;
	return !word.empty();
}

string AsmManager::ToLower(string s){
	string ret;
	for (unsigned i = 0; i < s.length(); ++i) ret += tolower(s[i]);
	return ret;
}

bool AsmManager::IsRegister(string& s){
	return s[0] == '$';
}

void AsmManager::init(string& asmCodes, string labelfilename)
{
	ifstream fin(labelfilename.c_str());
	string word;
	while (fin >> word){
		lableInstrument.insert(word);
	}
	
	unsigned pos = 0x00400000;
	vector<string> ins;	
	istringstream stin(asmCodes);

	while (GetWord(stin, word)){
		if (word[0] == '#') continue; //Skip commend
		if (*word.rbegin() == ':'){
			if (!ins.empty()) throw CompilingErrorException("Lable defined in an instrument.");
			word.resize(word.length() - 1);
			if (LableTable.find(word) != LableTable.end()) throw CompilingErrorException("Duplation Lables.");
			LableTable[word] = pos;
		}
		else {
			if (ins.empty()) {
				word = ToLower(word);
				ins.push_back(word);
				if (InstrumentType::infoTable.find(word) == InstrumentType::infoTable.end()) 
					throw CompilingErrorException("Wrong instrument name or we haven't support it.");
			}
			else{
				ins.push_back(word);
			}

			if (ins.size() == InstrumentType::ArgumentNumOfInstrument(ins[0]) + 1){
				// TODO: If have time, translate the pesudo code.
				AsmCodes.push_back(make_pair(ins, pos));
				pos += 4;
				if (lableInstrument.find(ins[0]) != lableInstrument.end()){
					// I don't know whether we need add a noop instrument after a jump instrument;
					// ins.clear();
					ins.clear();
					ins.push_back("noop");
					AsmCodes.push_back(make_pair(ins, pos));
					pos += 4;
				}
				ins.clear();				
			}
		}
	}

	for (vector<pair<vector<string>,int> >::iterator i = AsmCodes.begin(); i < AsmCodes.end(); ++i){
		if (lableInstrument.find(i->first[0]) != lableInstrument.end()){
			for (vector<string>::iterator j = i->first.begin() + 1; j < i->first.end(); ++j){
				if (!IsRegister(*j) && !IsNum(*j)){
					if (LableTable.find(*j) == LableTable.end()) throw CompilingErrorException("Undefined Lable.");

					unsigned address = LableTable[*j];
					ostringstream os;
					if (InstrumentType::ArgumentNumOfInstrument(i->first[0]) == 1){
						os << ((address & 0x0fffffff) >> 2);
					}
					else{
						os << ((address - i->second - 1) >> 2);
					}
					*j = os.str();
				}
			}
		}
	}
}

bool AsmManager::IsNum(string& s){
	for (string::iterator i = s.begin(); i != s.end(); ++i){
		if (!isdigit(*i)) return false;
	}
	return true;
}

void AsmManager::Translate(){
	TextCode item;
	for (vector<pair<vector<string>,int> >::iterator i = AsmCodes.begin(); i < AsmCodes.end(); ++i){
		cpu.instrument.SetAsmCode(i->first);
		item.asmCode = cpu.instrument.GetAsmCode();
		item.binary = cpu.instrument.GetCodeRegister().UIntV;
		item.address = i->second;
		textCodes.push_back(item);
	}
}


//AsmManager::AsmManager(std::string &asmCodes, std::string labelfilename){
//	init(asmCodes, labelfilename);
//}

//AsmManager::AsmManager(const char *filename, std::string labelfilename){
//	ifstream fin(filename);
//	string asmCodes;
//	char ch;
//	while(fin.get(ch)) asmCodes += ch;
//	init(asmCodes, labelfilename);
//}