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assemble.cpp
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assemble.cpp
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#include <iostream>
#include <fstream>
#include <map>
#include <bitset>
int main()
{
std::ifstream sourcecode("code.txt");//source code file in assembly
std::ofstream bincode("code.bin");//destination file of assembled code in binary (machine language)
//mapping of operations and operands to instruction code binary
std::map<std::string,std::string> opcodemap = {{"<","0011"},{">","1100"},
{"+","0001"},{"-","0001"},{"&","0001"},{"|","0001"},{"*","0001"},
{"+i","0010"},{"-i","0010"},
{"^","0100"},
{"^=","1000"}};//{"^!","1001"}
std::map<std::string,std::string> regmap = {{"R0","0000"},{"R1","0001"},{"R2","0010"},{"R3","0011"},
{"R4","0100"},{"R5","0101"},{"R6","0110"},{"R7","0111"},
{"R8","1000"},{"R9","1001"},{"R10","1010"},{"R11","1011"},
{"R12","1100"},{"R13","1101"},{"R14","1110"},{"R15","1111"}};
std::map<std::string,std::string> funcmap = {{"+","0001"},{"+i","0001"},{"-","0010"},{"-i","0010"},{"&","0100"},{"|","1000"},{"*","1111"}};
if(sourcecode.is_open())
{
std::string line;
do
{
sourcecode>>line;
}while(line!="{");
sourcecode>>line;
while(line!="}")
{
std::string ic = opcodemap[line];
if(opcodemap[line]=="0001")
{//R-Type : operation reg reg reg
std::string saved=line;
sourcecode>>line;
ic=ic+regmap[line];
sourcecode>>line;
ic=ic+regmap[line];
sourcecode>>line;
ic=ic+regmap[line];
ic=ic+"0000";
ic=ic+funcmap[saved];
}
else if(opcodemap[line]=="0010")
{//I-Type : operation reg reg immediate
std::string saved=line;
sourcecode>>line;
ic=ic+regmap[line];
sourcecode>>line;
ic=ic+regmap[line];
int i;
sourcecode>>i;
ic=ic+(std::bitset<8>(i).to_string());
ic=ic+funcmap[saved];
}
else if(opcodemap[line]=="0011" || opcodemap[line]== "1100")
{//Load and Store : operation reg address
sourcecode>>line;
ic=ic+regmap[line];
int i;
sourcecode>>i;
ic=ic+(std::bitset<16>(i).to_string());
}
else if(opcodemap[line]== "1000" || opcodemap[line]== "1001")
{//Branch : operation reg reg address
sourcecode>>line;
ic=ic+regmap[line];
sourcecode>>line;
ic=ic+regmap[line];
int i;
sourcecode>>i;
ic=ic+(std::bitset<12>(i).to_string());
}
else if(opcodemap[line]== "0100")
{//Jump : jump address
int i;
sourcecode>>i;
ic=ic+(std::bitset<20>(i).to_string());
}
bincode<<ic<<std::endl;
sourcecode>>line;
}
bincode<<"000000000000000000000000";
sourcecode.close();
bincode.close();
}
else
{//In case the source code file does not exist
std::cout<<"Code File Not Found";
return 1;
}
return 0;
}