Ejemplo n.º 1
0
  private void atSyncStmnt(Stmnt st) throws CompileError {
    int nbreaks = getListSize(breakList);
    int ncontinues = getListSize(continueList);

    compileExpr(st.head());
    if (exprType != CLASS && arrayDim == 0)
      throw new CompileError("bad type expr for synchronized block");

    Bytecode bc = bytecode;
    final int var = bc.getMaxLocals();
    bc.incMaxLocals(1);
    bc.addOpcode(DUP);
    bc.addAstore(var);
    bc.addOpcode(MONITORENTER);

    ReturnHook rh =
        new ReturnHook(this) {
          protected boolean doit(Bytecode b, int opcode) {
            b.addAload(var);
            b.addOpcode(MONITOREXIT);
            return false;
          }
        };

    int pc = bc.currentPc();
    Stmnt body = (Stmnt) st.tail();
    if (body != null) body.accept(this);

    int pc2 = bc.currentPc();
    int pc3 = 0;
    if (!hasReturned) {
      rh.doit(bc, 0); // the 2nd arg is ignored.
      bc.addOpcode(Opcode.GOTO);
      pc3 = bc.currentPc();
      bc.addIndex(0);
    }

    if (pc < pc2) { // if the body is not empty
      int pc4 = bc.currentPc();
      rh.doit(bc, 0); // the 2nd arg is ignored.
      bc.addOpcode(ATHROW);
      bc.addExceptionHandler(pc, pc2, pc4, 0);
    }

    if (!hasReturned) bc.write16bit(pc3, bc.currentPc() - pc3 + 1);

    rh.remove(this);

    if (getListSize(breakList) != nbreaks || getListSize(continueList) != ncontinues)
      throw new CompileError("sorry, cannot break/continue in synchronized block");
  }
Ejemplo n.º 2
0
 protected void incMaxLocals(int size) {
   bytecode.incMaxLocals(size);
 }