CompIR3Translator.ts

import { CompIR4, argument_register } from "./CompIR4.ts";
import { CompIR3 } from "./CompIR3.ts";

export function translate(code: CompIR3[]): CompIR4[] {
   const ir4 = new Array<CompIR4>();

   ir4.push({directive: [".global", "main"]})

   ir4.push({lbl: "str_print"});
   ir4.push({directive: [".string", "%lf\n"]});
   
   ir4.push({lbl: "dividend"});
   ir4.push({directive: [".double", "4294967296"]});

   ir4.push({lbl: "mask_int"});
   ir4.push({directive: [".long", "0"]});
   ir4.push({directive: [".long", "0xFFFFFFFF"]});
   

   ir4.push({lbl: "main"});


   for (const instruccion of code) {
      if (instruccion == "callBegin" || instruccion == "return" ||
         (typeof instruccion == "object" && ("callEnd" in instruccion || "functionIntro" in instruccion))) {

         if (instruccion == "callBegin") {
            //nada
         } else if (instruccion == "return") {
            ir4.push({ret: ""});

         } else if ("callEnd" in instruccion) {
            ir4.push({call: instruccion.callEnd})            

         } else if ("functionIntro" in instruccion) {
            const parametros_funcion = instruccion.functionIntro;

            const registers:argument_register[] = ["rdi", "rsi", "rdx", "rcx", "r8", "r9"];

            while (parametros_funcion.length > 0 && registers.length > 0) {
               const parameter = parametros_funcion.shift()
               const register = registers.shift();
               if (parameter == undefined || register == undefined) {
               throw new Error("PARAMETRO O REGISTRO ES UNDEFINED");       
               }

               ir4.push({movq: [register, parameter]})
            }

            for (const ubicacion_destino of parametros_funcion) {
               ir4.push({popq: ubicacion_destino});
             }
            
         }         
      } else {
         ir4.push(instruccion);
      }
   }
   
   ir4.push({cvtsi2sdq: [0, "xmm0"]});
   ir4.push({divsd: [{relative: "dividend"}, "xmm0"]});

   ir4.push({leaq: [{relative: "str_print"}, "rdi"]});
   ir4.push({movq: [{literal: 1}, "rax"]});

   ir4.push({call: "printf"});

   
   ir4.push({ movq: [{literal: 0}, "rax"]});

   ir4.push({leave: ""});
   ir4.push({ret: ""});

   return ir4;
}