Package com.facebook.presto.byteCode.instruction

Examples of com.facebook.presto.byteCode.instruction.LabelNode

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        CompilerContext context = generatorContext.getContext();

        RowExpression first = arguments.get(0);
        RowExpression second = arguments.get(1);

        LabelNode notMatch = new LabelNode("notMatch");

        // push first arg on the stack
        Block block = new Block(context)
                .comment("check if first arg is null")
                .append(generatorContext.generate(first))
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        IfStatement.IfStatementBuilder ifLeftIsNull = ifStatementBuilder(generator.getContext())
                .comment("if left wasNull...")
                .condition(new Block(context).getVariable("wasNull"));

        LabelNode end = new LabelNode("end");
        ifLeftIsNull.ifTrue(new Block(context)
                .comment("clear the null flag, pop left value off stack, and push left null flag on the stack (true)")
                .putVariable("wasNull", false)
                .pop(arguments.get(0).getType().getJavaType()) // discard left value
                .push(true));

        LabelNode leftIsTrue = new LabelNode("leftIsTrue");
        ifLeftIsNull.ifFalse(new Block(context)
                .comment("if left is false, push false, and goto end")
                .ifTrueGoto(leftIsTrue)
                .push(false)
                .gotoLabel(end)
                .comment("left was true; push left null flag on the stack (false)")
                .visitLabel(leftIsTrue)
                .push(false));

        block.append(ifLeftIsNull.build());

        // At this point we know the left expression was either NULL or TRUE.  The stack contains a single boolean
        // value for this expression which indicates if the left value was NULL.

        // eval right!
        block.append(right);

        IfStatement.IfStatementBuilder ifRightIsNull = ifStatementBuilder(context)
                .comment("if right wasNull...")
                .condition(new Block(context).getVariable("wasNull"));

        // this leaves a single boolean on the stack which is ignored since the value in NULL
        ifRightIsNull.ifTrue(new Block(context)
                .comment("right was null, pop the right value off the stack; wasNull flag remains set to TRUE")
                .pop(arguments.get(1).getType().getJavaType()));

        LabelNode rightIsTrue = new LabelNode("rightIsTrue");
        ifRightIsNull.ifFalse(new Block(context)
                .comment("if right is false, pop left null flag off stack, push false and goto end")
                .ifTrueGoto(rightIsTrue)
                .pop(boolean.class)
                .push(false)
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    }

    @Override
    public void accept(MethodVisitor visitor)
    {
        LabelNode tryStart = new LabelNode("tryStart");
        LabelNode tryEnd = new LabelNode("tryEnd");
        LabelNode handler = new LabelNode("handler");
        LabelNode done = new LabelNode("done");

        Block block = new Block(context);

        // try block
        block.visitLabel(tryStart)
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            ByteCodeExpression rightBlock = compilerContext
                    .getVariable("rightBlocks")
                    .getElement(index);

            LabelNode checkNextField = new LabelNode("checkNextField");
            hashPositionMethod
                    .getBody()
                    .append(typeEquals(compilerContext,
                            type,
                            leftBlock,
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                    .getVariable("this")
                    .getField(joinChannelFields.get(index))
                    .invoke("get", Object.class, compilerContext.getVariable("rightBlockIndex"))
                    .cast(com.facebook.presto.spi.block.Block.class);

            LabelNode checkNextField = new LabelNode("checkNextField");
            hashPositionMethod
                    .getBody()
                    .append(typeEquals(compilerContext,
                            type,
                            leftBlock,
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    }

    @Override
    public ByteCodeNode getByteCode()
    {
        LabelNode falseLabel = new LabelNode("false");
        LabelNode endLabel = new LabelNode("end");
        return new Block(null)
                .append(left)
                .ifFalseGoto(falseLabel)
                .append(right)
                .ifFalseGoto(falseLabel)
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                .getField(positionField)
                .push(1)
                .intAdd()
                .putField(positionField);

        LabelNode lessThan = new LabelNode("lessThan");
        LabelNode end = new LabelNode("end");
        advanceNextPositionBody
                .comment("return position < positionCount;")
                .pushThis()
                .getField(positionField)
                .pushThis()
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                "currentRowContainsNull",
                type(boolean.class))
                .getBody();

        for (FieldDefinition probeBlockField : probeBlockFields) {
            LabelNode checkNextField = new LabelNode("checkNextField");
            body
                    .append(context.getVariable("this").getField(probeBlockField).invoke("isNull", boolean.class, context.getVariable("this").getField(positionField)))
                    .ifFalseGoto(checkNextField)
                    .push(true)
                    .retBoolean()
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    }

    @Override
    public ByteCodeNode getByteCode()
    {
        LabelNode trueLabel = new LabelNode("true");
        LabelNode endLabel = new LabelNode("end");
        return new Block(null)
                .append(left)
                .ifTrueGoto(trueLabel)
                .append(right)
                .ifTrueGoto(trueLabel)
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                            leftBlock,
                            leftBlockPosition,
                            rightBlock,
                            rightBlockPosition));

            LabelNode equal = new LabelNode("equal");
            block.comment("if (compare != 0) return compare")
                    .dup()
                    .ifZeroGoto(equal)
                    .retInt()
                    .visitLabel(equal)
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Related Classes of com.facebook.presto.byteCode.instruction.LabelNode

  • com.facebook.presto.byteCode.control.TryCatch
  • com.facebook.presto.byteCode.expression.AndByteCodeExpression
  • com.facebook.presto.byteCode.expression.ComparisonByteCodeExpression
  • com.facebook.presto.byteCode.expression.InlineIfByteCodeExpression
  • com.facebook.presto.byteCode.expression.NotByteCodeExpression
  • com.facebook.presto.byteCode.expression.OrByteCodeExpression
  • com.facebook.presto.sql.gen.AndCodeGenerator
  • com.facebook.presto.sql.gen.ByteCodeExpressionVisitor
  • com.facebook.presto.sql.gen.ByteCodeUtils
  • com.facebook.presto.sql.gen.CursorProcessorCompiler
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