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

com.google.gwt.dev.jjs.ast.JBooleanLiteral
Java boolean literal expression.

     */
    @Override
    public void endVisit(JDoStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, replace do with do's body
        if (!booleanLiteral.getValue()) {
          if (Simplifier.isEmpty(x.getBody())) {
            ctx.removeMe();
          } else { // Unless it contains break/continue statements
            FindBreakContinueStatementsVisitor visitor = new FindBreakContinueStatementsVisitor();
            visitor.accept(x.getBody());

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     */
    @Override
    public void endVisit(JForStatement x, Context ctx) {
      JExpression expression = x.getCondition();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, replace the for statement with its initializers
        if (!booleanLiteral.getValue()) {
          JBlock block = new JBlock(x.getSourceInfo());
          block.addStmts(x.getInitializers());
          replaceMe(block, ctx);
        }
      }

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     */
    @Override
    public void endVisit(JWhileStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, prune the while statement
        if (!booleanLiteral.getValue()) {
          removeMe(x, ctx);
        }
      }
    }

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            return true;
          }
          return false;


        case NOT: {
          JBooleanLiteral booleanLit = (JBooleanLiteral) exp;
          ctx.replaceMe(program.getLiteralBoolean(!booleanLit.getValue()));
          return true;
        }


        default:
          return false;

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     * y ^ false    -> y
     * </pre>
     */
    private void simplifyXor(JExpression lhs, JExpression rhs, Context ctx) {
      if (lhs instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) lhs;
        simplifyXor(rhs, booleanLiteral, ctx);
      } else if (rhs instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) rhs;
        simplifyXor(lhs, booleanLiteral, ctx);
      }
    }

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      // TODO(spoon): immediately simplify the resulting block
      return newBlock;
    }


    if (condExpr instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLiteral = (JBooleanLiteral) condExpr;
      boolean boolVal = booleanLiteral.getValue();
      if (boolVal && !isEmpty(thenStmt)) {
        // If true, replace myself with then statement
        return thenStmt;
      } else if (!boolVal && !isEmpty(elseStmt)) {
        // If false, replace myself with else statement

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      // 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;

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      // TODO(rluble): immediately simplify the resulting multi.
      // TODO(rluble): refactor common outward JMultiExpression movement.
      return newMulti;
    }
    if (lhs instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLiteral = (JBooleanLiteral) lhs;
      if (booleanLiteral.getValue()) {
        return rhs;
      } else {
        return lhs;
      }


    } else if (rhs instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLiteral = (JBooleanLiteral) rhs;
      if (booleanLiteral.getValue()) {
        return lhs;
      } else if (!lhs.hasSideEffects()) {
        return rhs;
      }
    }

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      // TODO(rluble): immediately simplify the resulting multi.
      // TODO(rluble): refactor common outward JMultiExpression movement.
      return newMulti;
    }
    if (lhs instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLiteral = (JBooleanLiteral) lhs;
      if (booleanLiteral.getValue()) {
        return lhs;
      } else {
        return rhs;
      }
    } else if (rhs instanceof JBooleanLiteral) {
      JBooleanLiteral booleanLiteral = (JBooleanLiteral) rhs;
      if (!booleanLiteral.getValue()) {
        return lhs;
      } else if (!lhs.hasSideEffects()) {
        return rhs;
      }
    }

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      if (op == JBinaryOperator.AND) {
        // simplify short circuit AND expressions
        if (lhs instanceof JBooleanLiteral) {
          // eg: if (false && isWhatever()) -> if (false)
          // eg: if (true && isWhatever()) -> if (isWhatever())
          JBooleanLiteral booleanLiteral = (JBooleanLiteral) lhs;
          if (booleanLiteral.getValue()) {
            ctx.replaceMe(rhs);
          } else {
            ctx.replaceMe(lhs);
          }


        } else if (rhs instanceof JBooleanLiteral) {
          // eg: if (isWhatever() && true) -> if (isWhatever())
          // eg: if (isWhatever() && false) -> if (false), unless side effects
          JBooleanLiteral booleanLiteral = (JBooleanLiteral) rhs;
          if (booleanLiteral.getValue()) {
            ctx.replaceMe(lhs);
          } else if (!lhs.hasSideEffects()) {
            ctx.replaceMe(rhs);
          }
        }


      } else if (op == JBinaryOperator.OR) {
        // simplify short circuit OR expressions
        if (lhs instanceof JBooleanLiteral) {
          // eg: if (true || isWhatever()) -> if (true)
          // eg: if (false || isWhatever()) -> if (isWhatever())
          JBooleanLiteral booleanLiteral = (JBooleanLiteral) lhs;
          if (booleanLiteral.getValue()) {
            ctx.replaceMe(lhs);
          } else {
            ctx.replaceMe(rhs);
          }


        } else if (rhs instanceof JBooleanLiteral) {
          // eg: if (isWhatever() || false) -> if (isWhatever())
          // eg: if (isWhatever() && true) -> if (true), unless side effects
          JBooleanLiteral booleanLiteral = (JBooleanLiteral) rhs;
          if (!booleanLiteral.getValue()) {
            ctx.replaceMe(lhs);
          } else if (!lhs.hasSideEffects()) {
            ctx.replaceMe(rhs);
          }
        }

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

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

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