class.methods.Copy.scala Maven / Gradle / Ivy

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case-class-generator

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package com.julianpeeters.caseclass.generator
import artisanal.pickle.maker._
import scala.reflect.internal.pickling._
import org.objectweb.asm._
import Opcodes._

import java.util.Arrays
import scala.io.Codec._
case class Copy(cw: ClassWriter, var mv: MethodVisitor, caseClassName: String, fieldData: List[EnrichedField]) {
  def dump = {

    mv = cw.visitMethod(ACC_PUBLIC, "copy", "(" + fieldData.map(fd => fd.typeData.typeDescriptor).mkString + ")L" + caseClassName + ";", "(" + fieldData.map(fd => fd.typeData.unerasedTypeDescriptor).mkString + ")L" + caseClassName + ";", null);
    mv.visitCode();
    mv.visitTypeInsn(NEW, caseClassName);
    mv.visitInsn(DUP);

    var argIndex = 1

    fieldData.map(fd => fd.typeData.loadInstr).foreach(lI => {
      if (lI == DLOAD | lI == LLOAD) {
        mv.visitVarInsn(lI, argIndex);
        argIndex += 2
      }
      else {
        mv.visitVarInsn(lI, argIndex);
        argIndex += 1;
      }
    })

    mv.visitMethodInsn(INVOKESPECIAL, caseClassName, "", "(" + fieldData.map(fd => fd.typeData.typeDescriptor).mkString + ")V");
    mv.visitInsn(ARETURN);
    mv.visitMaxs(5, 4);
    mv.visitEnd();
  }
}