Completed source code for generating .mif files from opcodes and registers

InstructionGenerator.cpp

@@ -1,8 +1,27 @@
+/*
+  Source code for generating MIF files from instructions
+  Input format: Text file with each instruction on a seperate line (see below, please follow this new lines breeak this code);
+  Output format: Use stdout to redirect to filename.mif or filename.txt and then convert to .mif
+  Single instruction format and example:
+    1. INSTRUCTION RD RS1 RS2 (all in capitals, seperated by whitespace (this is okay if not exact, code removes whitespace anyway),
+        BUT MUST INCLUDE R for registers)
+        example: AND R2 R4 R5
+                 MUL R0 R4 R7
+                 JMP R2
+                 STP
+        For instructions that use only two registers, example MOV: MOV R0 R1 (do not enter third register, just proceed to next instruction)
+        For instructions that use one register, example JMP: JMP R0 (similar to before, just proceed to next instruction)
+        For insturctions that use no registers, example STP: STP (and just proceed to next line)
+    2. LDA/STA RN MEMORY_LOCATION(DECIMAL) (please make sure memory location is in DECIMAL, otherwise bad things happen with the code)
+      example: LDA R3 1546
+               STA R6 909
+*/
+
 #include <iostream>
-#include <sstream>
 #include <string>
 #include <vector>
 #include <cassert>
+#include <algorithm>
 
 using namespace std;
 
@@ -14,17 +33,6 @@ using namespace std;
 const unsigned int RAM_SIZE = 2048;
 const unsigned int INSTRUCTION_LENGTH = 16;
 
-vector<string> getWords(string line){
-  vector<string> ans;
-  istringstream stream(line);
-  while (stream){
-    string temp;
-    stream >> temp;
-    ans.pb(temp);
-  }
-  return ans;
-}
-
 string convertBinaryToHex(string binary4){
   if(binary4=="0000"){
     return "0";
@@ -59,45 +67,200 @@ string convertBinaryToHex(string binary4){
   }else if(binary4=="1111"){
     return "F";
   }else{
+    cerr << "Invalide binary quartet, cannot convert to HEX (line 78 in .cpp file)" << endl;
     assert(0);
   }
 }
 
+string convertDecimalToBinary(int decimal, int digits){
+  if (decimal>2047){
+    cerr << "Too large memory location, we don't have that much memory for LDA/STA" << endl;
+    assert(0);
+  }
+  string ans="";
+  while(decimal>0){
+    int rem = decimal%2;
+    ans+=to_string(rem);
+    decimal/=2;
+  }
+  while(ans.size()<digits){
+    ans+="0";
+  }
+  reverse(ans.begin(), ans.end());
+  return ans;
+}
+
 string convertInstructionToHex(string binaryInstruction){
   string ans="";
   string temp="";
-  assert(binaryInstruction.size()==16);
+  if (binaryInstruction.size()!=16){
+    cerr << "Instruction needs to be exactly 16 bits long, crash in line 105" << endl;
+    assert(0);
+  }
   for (int i=0; i<16; i++){
-    temp+=binaryInstr.at(i);
-    if(i==3 || i==7 ||i==11 || i==15){
+    temp+=binaryInstruction.at(i);
+    if(i==3 || i==7 || i==11 || i==15){
       ans+=convertBinaryToHex(temp);
-      temp=""
+      temp="";
     }
   }
   return ans;
 }
 
+string getRegisterBinary(string reg){
+  if (reg.size()!=2){
+    cerr << "Invalid register format, please use form RN, example R0, R3,...; crash in line 120" << endl;
+    assert(0);
+  }
+  if(reg.at(1)=='0'){
+    return "000";
+  }else if(reg.at(1)=='1'){
+    return "001";
+  }else if(reg.at(1)=='2'){
+    return "010";
+  }else if(reg.at(1)=='3'){
+    return "011";
+  }else if(reg.at(1)=='4'){
+    return "100";
+  }else if(reg.at(1)=='5'){
+    return "101";
+  }else if(reg.at(1)=='6'){
+    return "110";
+  }else if(reg.at(1)=='7'){
+    return "111";
+  }else{
+    cerr << "Unknown register input (not between 0 and 7), crash in line 140" << endl;
+    assert(0);
+  }
+}
+
 string getInstructionHex(string instruction){
+  string opcode = instruction.substr(0, 3);
+  string rd = instruction.substr(3, 2);
   string binary;
-  string opcode, rs1, rs2, rd;
 
   if (opcode=="LDA" || opcode=="STA"){
-    binary="1";
-    if(opcode=="LDA"){
-
-    }else if (opcode=="STA"){
-
-    }else {
+    if (instruction.size()<6){
+      cerr << "Instruction format not valid, crash at line 155" << endl;
       assert(0);
     }
-  }else{
-    switch (opcode) {
-      case "":
-        // Add code
-        break;
+    binary="1";
+    if(opcode=="LDA"){
+        binary+="0";
+    }else if (opcode=="STA"){
+        binary+="1";
+    }else {
+      cerr << "Unknown instruction, I think you wanted LDA or STA, crash in line 164" << endl;
+      assert(0);
     }
+    binary+=getRegisterBinary(rd);
+    int lengthOfAddress = instruction.size()-5;
+    binary+=convertDecimalToBinary(stoi(instruction.substr(5, lengthOfAddress)), 11);
+  }else{
+    binary="0";
+    string rs1, rs2;
+
+    if(instruction.size()>=7){
+      rs1 = instruction.substr(5, 2);
+    }
+    if(instruction.size()>=9){
+      rs2 = instruction.substr(7, 2);
+    }
+    if(opcode=="JMP"){
+      binary+="000000";
+      rs1="R0";
+      rs2="R0";
+    }else if(opcode=="JC1"){
+      binary+="000100";
+    }else if(opcode=="JC2"){
+      binary+="000101";
+    }else if(opcode=="JC3"){
+      binary+="000110";
+    }else if(opcode=="JC4"){
+      binary+="000111";
+      rs2="R0";
+    }else if(opcode=="JC5"){
+      binary+="001000";
+    }else if(opcode=="JC6"){
+      binary+="001001";
+    }else if(opcode=="JC7"){
+      binary+="001010";
+    }else if(opcode=="JC8"){
+      binary+="001011";
+      rs2="R0";
+    }else if(opcode=="AND"){
+      binary+="001100";
+    }else if(opcode=="OR"){
+      binary+="001101";
+    }else if(opcode=="XOR"){
+      binary+="001110";
+    }else if(opcode=="NOT"){
+      binary+="001111";
+      rs2="R0";
+    }else if(opcode=="NND"){
+      binary+="010000";
+    }else if(opcode=="NOR"){
+      binary+="010001";
+    }else if(opcode=="XNR"){
+      binary+="010010";
+    }else if(opcode=="MOV"){
+      binary+="010011";
+      rs2="R0";
+    }else if(opcode=="ADD"){
+      binary+="010100";
+    }else if(opcode=="ADC"){
+      binary+="010101";
+    }else if(opcode=="ADO"){
+      binary+="010110";
+      rs1="R0";
+      rs2="R0";
+    }else if(opcode=="SUB"){
+      binary+"011000";
+    }else if(opcode=="SBC"){
+      binary+="011001";
+    }else if(opcode=="SBO"){
+      binary+="011010";
+      rs1="R0";
+      rs2="R0";
+    }else if(opcode=="MUL"){
+      binary+="011100";
+    }else if(opcode=="MLA"){
+      binary+="011101";
+    }else if(opcode=="MLS"){
+      binary+="011110";
+    }else if(opcode=="MRT"){
+      /*
+        TO BE COMPLETED FOR REGISTERS, ASK AADI
+      */
+      binary+="011111";
+    }else if(opcode=="LSL"){
+      binary+="100000";
+    }else if(opcode=="LSR"){
+      binary+="100001";
+    }else if(opcode=="ASR"){
+      binary+="100011";
+    }else if(opcode=="ROR"){
+      binary+="100100";
+    }else if(opcode=="RRC"){
+      binary+="100101";
+    }else if(opcode=="NOP"){
+      binary+="111110";
+      rd="R0";
+      rs1="R0";
+      rs2="R0";
+    }else if(opcode=="STP"){
+      binary+="111111";
+      rd="R0";
+      rs1="R0";
+      rs2="R0";
+    }else{
+      assert(0);
+    }
+    binary+=getRegisterBinary(rd);
+    binary+=getRegisterBinary(rs1);
+    binary+=getRegisterBinary(rs2);
   }
-  return ans;
+  return convertInstructionToHex(binary);
 }
 
 void generateMIF(vector<string> instructions){
@@ -108,8 +271,8 @@ void generateMIF(vector<string> instructions){
   cout << "CONTENT" << endl;
   cout << "BEGIN" << endl;
   cout << "[0..2047]: 0;" << endl;
-  for (int i = 0; i <= instruction.size(); i++){
-    cout << i << " : " << instruction.at(i) << ";" << endl;
+  for (int i = 0; i < instructions.size(); i++){
+    cout << i << " : " << instructions.at(i) << ";" << endl;
   }
 }
 
@@ -118,7 +281,11 @@ int main(){
   string temp;
   vector<string> hexCodes;
   while(getline(cin, temp)){
-    hexCodes.pb(getInstructionHex(temp));
+    auto it = remove(temp.begin(), temp.end(), ' ');
+    temp.erase(it, temp.end());
+    if (temp.size()>=3){
+      hexCodes.pb(getInstructionHex(temp));
+    }
   }
   generateMIF(hexCodes);
 }