Class Code

UnLuac/src/unluac/decompile/Code.java:6–164

import unluac.parse.LFunction;

public class Code {
  
  private final CodeExtract extractor;
  private final OpcodeMap map;
  private final int[] code;
  private final boolean[] extraByte;
  private final boolean[] upvalue;
  public final int length;
  
  public Code(LFunction function) {
    this.code = function.code;
    this.length = code.length;
    map = function.header.opmap;
    extractor = function.header.extractor;
    extraByte = new boolean[length];
    for(int i = 0; i < length; i++) {
      int line = i + 1;
      Op op = op(line);
      extraByte[i] = op != null && op.hasExtraByte(codepoint(line), extractor);
    }
    upvalue = new boolean[length];
    if(function.header.version.upvaluedeclarationtype.get() == Version.UpvalueDeclarationType.INLINE) {
      for(int i = 0; i < length; i++) {
        int line = i + 1;
        if(op(line) == Op.CLOSURE) {
          int f = Bx(line);
          if(f < function.functions.length) {
            int nups = function.functions[f].numUpvalues;
            for(int j = 1; j <= nups; j++) {
              if(i + j < length) {
                upvalue[i + j] = true;
              }
            }
          }
        }
      }
    }
  }
  
  public CodeExtract getExtractor() {
    return extractor;
  }
  
  //public boolean reentered = false;
  
  /**
   * Returns the operation indicated by the instruction at the given line.
   */
  public Op op(int line) {
    /*if(!reentered) {
      reentered = true;
      System.out.println("line " + line + ": " + toString(line));
      reentered = false;
    }*/
    if(line >= 2 && extraByte[line - 2]) {
      return Op.EXTRABYTE;
    } else {
      return map.get(opcode(line));