Package com.google.gwt.dev.jjs.ast

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

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      return newMulti;
    }
    if (arg instanceof JBinaryOperation) {
      // try to invert the binary operator
      JBinaryOperation argOp = (JBinaryOperation) arg;
      JBinaryOperator op = argOp.getOp();
      JBinaryOperator newOp = null;
      if (op == JBinaryOperator.EQ) {
        // e.g. !(x == y) -> x != y
        newOp = JBinaryOperator.NEQ;
      } else if (op == JBinaryOperator.NEQ) {
        // e.g. !(x != y) -> x == y
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      return processBinaryOperation(info, JBinaryOperator.ASG, type, x.lhs,
          x.expression);
    }

    JExpression processExpression(BinaryExpression x) {
      JBinaryOperator op;

      int binOp = (x.bits & ASTNode.OperatorMASK) >> ASTNode.OperatorSHIFT;
      switch (binOp) {
        case BinaryExpression.LEFT_SHIFT:
          op = JBinaryOperator.SHL;
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    JExpression processExpression(CombinedBinaryExpression x) {
      return processExpression((BinaryExpression) x);
    }

    JExpression processExpression(CompoundAssignment x) {
      JBinaryOperator op;

      switch (x.operator) {
        case CompoundAssignment.PLUS:
          if (typeMap.get(x.resolvedType) == program.getTypeJavaLangString()) {
            op = JBinaryOperator.ASG_CONCAT;
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          elseExpr);
      return conditional;
    }

    JExpression processExpression(EqualExpression x) {
      JBinaryOperator op;
      switch ((x.bits & BinaryExpression.OperatorMASK) >> BinaryExpression.OperatorSHIFT) {
        case BinaryExpression.EQUAL_EQUAL:
          op = JBinaryOperator.EQ;
          break;
        case BinaryExpression.NOT_EQUAL:
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    /**
     * Short circuit binary operations.
     */
    @Override
    public void endVisit(JBinaryOperation x, Context ctx) {
      JBinaryOperator op = x.getOp();
      JExpression lhs = x.getLhs();
      JExpression rhs = x.getRhs();
      if ((lhs instanceof JValueLiteral) && (rhs instanceof JValueLiteral)) {
        if (evalOpOnLiterals(op, (JValueLiteral) lhs, (JValueLiteral) rhs, ctx)) {
          return;
        }
      }
      switch (op) {
        case AND:
          shortCircuitAnd(lhs, rhs, ctx);
          break;
        case OR:
          shortCircuitOr(lhs, rhs, ctx);
          break;
        case BIT_XOR:
          simplifyXor(lhs, rhs, ctx);
          break;
        case EQ:
          // simplify: null == null -> true
          if (lhs.getType() == program.getTypeNull()
              && rhs.getType() == program.getTypeNull() && !x.hasSideEffects()) {
            ctx.replaceMe(program.getLiteralBoolean(true));
            return;
          }
          simplifyEq(lhs, rhs, ctx, false);
          break;
        case NEQ:
          // simplify: null != null -> false
          if (lhs.getType() == program.getTypeNull()
              && rhs.getType() == program.getTypeNull() && !x.hasSideEffects()) {
            ctx.replaceMe(program.getLiteralBoolean(false));
            return;
          }
          simplifyEq(lhs, rhs, ctx, true);
          break;
        case ADD:
          simplifyAdd(lhs, rhs, ctx, x.getType());
          break;
        case CONCAT:
          evalConcat(lhs, rhs, ctx);
          break;
        case SUB:
          simplifySub(lhs, rhs, ctx, x.getType());
          break;
        case MUL:
          simplifyMul(lhs, rhs, ctx, x.getType());
          break;
        case DIV:
          simplifyDiv(lhs, rhs, ctx, x.getType());
          break;
        case SHL:
        case SHR:
        case SHRU:
          if (isLiteralZero(rhs)) {
            ctx.replaceMe(lhs);
          }
          break;
        default:
          if (op.isAssignment()) {
            lvalues.remove(lhs);
          }
          break;
      }
    }
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    /**
     * Short circuit binary operations.
     */
    @Override
    public void endVisit(JBinaryOperation x, Context ctx) {
      JBinaryOperator op = x.getOp();
      JExpression lhs = x.getLhs();
      JExpression rhs = x.getRhs();
      if ((lhs instanceof JValueLiteral) && (rhs instanceof JValueLiteral)) {
        if (evalOpOnLiterals(op, (JValueLiteral) lhs, (JValueLiteral) rhs, ctx)) {
          return;
        }
      }
      switch (op) {
        case AND:
          shortCircuitAnd(lhs, rhs, ctx);
          break;
        case OR:
          shortCircuitOr(lhs, rhs, ctx);
          break;
        case BIT_XOR:
          simplifyXor(lhs, rhs, ctx);
          break;
        case EQ:
          // simplify: null == null -> true
          if (lhs.getType() == program.getTypeNull()
              && rhs.getType() == program.getTypeNull() && !x.hasSideEffects()) {
            ctx.replaceMe(program.getLiteralBoolean(true));
            return;
          }
          simplifyEq(lhs, rhs, ctx, false);
          break;
        case NEQ:
          // simplify: null != null -> false
          if (lhs.getType() == program.getTypeNull()
              && rhs.getType() == program.getTypeNull() && !x.hasSideEffects()) {
            ctx.replaceMe(program.getLiteralBoolean(false));
            return;
          }
          simplifyEq(lhs, rhs, ctx, true);
          break;
        case ADD:
          simplifyAdd(lhs, rhs, ctx, x.getType());
          break;
        case CONCAT:
          evalConcat(lhs, rhs, ctx);
          break;
        case SUB:
          simplifySub(lhs, rhs, ctx, x.getType());
          break;
        case MUL:
          simplifyMul(lhs, rhs, ctx, x.getType());
          break;
        case DIV:
          simplifyDiv(lhs, rhs, ctx, x.getType());
          break;
        case SHL:
        case SHR:
        case SHRU:
          if (isLiteralZero(rhs)) {
            ctx.replaceMe(lhs);
          }
          break;
        default:
          if (op.isAssignment()) {
            lvalues.remove(lhs);
          }
          break;
      }
    }
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    @Override
    public void endVisit(JBinaryOperation x, Context ctx) {
      JType lhsType = x.getLhs().getType();
      JType rhsType = x.getRhs().getType();
      JType resultType = x.getType();
      JBinaryOperator op = x.getOp();

      if (resultType == program.getTypeJavaLangString()) {
        // Don't mess with concat.
        return;
      }

      if (lhsType == JPrimitiveType.BOOLEAN
          && (op == JBinaryOperator.AND || op == JBinaryOperator.OR)) {
        // Don't mess with if rewriter.
        return;
      }

      // Special case: shift operators always coerce a long RHS to int.
      if (op.isShiftOperator()) {
        if (rhsType == longType) {
          rhsType = program.getTypePrimitiveInt();
        }
      } else if (lhsType == longType || rhsType == longType) {
        // We must coerce lhs and rhs to the same type, either long or a float.

        // Assume a long type.
        JType coerceTo = longType;

        // But double / float takes precedence over long.
        JPrimitiveType floatType = program.getTypePrimitiveFloat();
        JPrimitiveType doubleType = program.getTypePrimitiveDouble();
        // See if the lhs can coerce the rhs
        if ((lhsType == floatType || lhsType == doubleType)) {
          coerceTo = lhsType;
        }
        if (op.isAssignment()) {
          // In an assignment, the lhs must coerce the rhs
          coerceTo = lhsType;
        } else if ((rhsType == floatType || rhsType == doubleType)) {
          coerceTo = rhsType;
        }
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      return newMulti;
    }
    if (arg instanceof JBinaryOperation) {
      // try to invert the binary operator
      JBinaryOperation argOp = (JBinaryOperation) arg;
      JBinaryOperator op = argOp.getOp();
      JBinaryOperator newOp = null;
      if (op == JBinaryOperator.EQ) {
        // e.g. !(x == y) -> x != y
        newOp = JBinaryOperator.NEQ;
      } else if (op == JBinaryOperator.NEQ) {
        // e.g. !(x != y) -> x == y
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    } else {
      // if () { } -> ... && ...;
      JExpression thenExpression = extractExpression(thenStmt);

      if (thenExpression != null) {
        JBinaryOperator binaryOperator = JBinaryOperator.AND;

        JExpression unflipExpression = maybeUnflipBoolean(condExpr);
        if (unflipExpression != null) {
          condExpr = unflipExpression;
          binaryOperator = JBinaryOperator.OR;
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      return processBinaryOperation(info, JBinaryOperator.ASG, type, x.lhs,
          x.expression);
    }

    JExpression processExpression(BinaryExpression x) {
      JBinaryOperator op;

      int binOp = (x.bits & ASTNode.OperatorMASK) >> ASTNode.OperatorSHIFT;
      switch (binOp) {
        case BinaryExpression.LEFT_SHIFT:
          op = JBinaryOperator.SHL;
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Related Classes of com.google.gwt.dev.jjs.ast.JBinaryOperator

  • com.google.gwt.dev.jjs.impl.CompoundAssignmentNormalizer$BreakupAssignOpsVisitor
  • com.google.gwt.dev.jjs.impl.DeadCodeElimination$DeadCodeVisitor
  • com.google.gwt.dev.jjs.impl.EqualityNormalizer$BreakupAssignOpsVisitor
  • com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor
  • com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor
  • com.google.gwt.dev.jjs.impl.LongCastNormalizer$ImplicitCastVisitor
  • com.google.gwt.dev.jjs.impl.Simplifier
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