Examples of com.google.gwt.dev.jjs.ast.JPrefixOperation

com.google.gwt.dev.jjs.ast.JPrefixOperation
Java prefix operation expression.

            newOp, argOp.getLhs(), argOp.getRhs());
        return newBinOp;
      }
    } else if (arg instanceof JPrefixOperation) {
      // try to invert the unary operator
      JPrefixOperation argOp = (JPrefixOperation) arg;
      JUnaryOperator op = argOp.getOp();
      // e.g. !!x -> x
      if (op == JUnaryOperator.NOT) {
        return argOp.getArg();
      }
    } else if (arg instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLit = (JBooleanLiteral) arg;
      return JBooleanLiteral.get(!booleanLit.getValue());
    }


    // no simplification made
    if (original != null) {
      return original;
    }
    return new JPrefixOperation(info, JUnaryOperator.NOT, arg);
  }

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          JExpression condition =
              new JBinaryOperation(info, JPrimitiveType.BOOLEAN, JBinaryOperator.LT, new JLocalRef(
                  info, indexVar), new JLocalRef(info, maxVar));


          // ++i$index
          JExpression increments = new JPrefixOperation(info, JUnaryOperator.INC,
              new JLocalRef(info, indexVar));


          // T elementVar = i$array[i$index];
          elementDecl.initializer =
              new JArrayRef(info, new JLocalRef(info, arrayVar), new JLocalRef(info, indexVar));

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          default:
            throw new InternalCompilerException("Unexpected prefix operator");
        }


        JExpression lhs = pop(x.lhs);
        push(new JPrefixOperation(info, op, lhs));
      } catch (Throwable e) {
        throw translateException(x, e);
      }
    }

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          default:
            throw new InternalCompilerException("Unexpected operator for unary expression");
        }


        JExpression expression = pop(x.expression);
        push(new JPrefixOperation(info, op, expression));
      } catch (Throwable e) {
        throw translateException(x, e);
      }
    }

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    public void endVisit(JPostfixOperation x, Context ctx) {
      if (x.getOp().isModifying()) {
        lvalues.remove(x.getArg());
      }
      if (ignoringExpressionOutput.contains(x)) {
        JPrefixOperation newOp = new JPrefixOperation(x.getSourceInfo(), x.getOp(), x.getArg());
        ctx.replaceMe(newOp);
      }
    }

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     */
    private void simplifyBooleanEq(JExpression exp, boolean bool, Context ctx) {
      if (bool) {
        ctx.replaceMe(exp);
      } else {
        ctx.replaceMe(new JPrefixOperation(exp.getSourceInfo(), JUnaryOperator.NOT, exp));
      }
    }

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     * @return A simplified expression equivalent to <code>- exp</code>.
     */
    private JExpression simplifyNegate(JExpression original, JExpression exp) {
      // - -x -> x
      if (exp instanceof JPrefixOperation) {
        JPrefixOperation prefarg = (JPrefixOperation) exp;
        if (prefarg.getOp() == JUnaryOperator.NEG) {
          return prefarg.getArg();
        }
      }


      // no change
      if (original != null) {
        return original;
      }
      return new JPrefixOperation(exp.getSourceInfo(), JUnaryOperator.NEG, exp);
    }

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      return false;
    }


    private void simplifyXor(JExpression lhs, JBooleanLiteral rhs, Context ctx) {
      if (rhs.getValue()) {
        ctx.replaceMe(new JPrefixOperation(lhs.getSourceInfo(), JUnaryOperator.NOT, lhs));
      } else {
        ctx.replaceMe(lhs);
      }
    }

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            new JBinaryOperation(info, argOp.getType(), newOp, argOp.getLhs(), argOp.getRhs());
        return newBinOp;
      }
    } else if (arg instanceof JPrefixOperation) {
      // try to invert the unary operator
      JPrefixOperation argOp = (JPrefixOperation) arg;
      JUnaryOperator op = argOp.getOp();
      // e.g. !!x -> x
      if (op == JUnaryOperator.NOT) {
        return argOp.getArg();
      }
    } else if (arg instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLit = (JBooleanLiteral) arg;
      return JBooleanLiteral.get(!booleanLit.getValue());
    }


    // no simplification made
    if (original != null) {
      return original;
    }
    return new JPrefixOperation(info, JUnaryOperator.NOT, arg);
  }

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    return false;
  }


  @Override
  public boolean visit(JPrefixOperation x, Context ctx) {
    expression = new JPrefixOperation(x.getSourceInfo(), x.getOp(), cloneExpression(x.getArg()));
    return false;
  }

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Related Classes of com.google.gwt.dev.jjs.ast.JPrefixOperation

com.google.gwt.dev.jjs.impl.AssertionNormalizer$AssertNormalizeVisitor

com.google.gwt.dev.jjs.impl.CloneExpressionVisitor

com.google.gwt.dev.jjs.impl.DeadCodeElimination$DeadCodeVisitor

com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor

com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor

com.google.gwt.dev.jjs.impl.Simplifier

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