Package com.facebook.presto.byteCode

Examples of com.facebook.presto.byteCode.CompilerContext

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        return new ReflectionJoinProbeFactory(joinProbeClass);
    }

    private Class<? extends JoinProbe> compileJoinProbe(int channelCount, List<Integer> probeChannels, DynamicClassLoader classLoader)
    {
        ClassDefinition classDefinition = new ClassDefinition(new CompilerContext(bootstrapMethod),
                a(PUBLIC, FINAL),
                typeFromPathName("JoinProbe_" + CLASS_ID.incrementAndGet()),
                type(Object.class),
                type(JoinProbe.class));
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            List<FieldDefinition> probeChannelFields,
            FieldDefinition probeBlocksArrayField,
            FieldDefinition positionField,
            FieldDefinition positionCountField)
    {
        Block constructor = classDefinition.declareConstructor(new CompilerContext(bootstrapMethod),
                a(PUBLIC),
                arg("lookupSource", LookupSource.class),
                arg("page", Page.class))
                .getBody()
                .comment("super();")
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        constructor.ret();
    }

    private void generateGetChannelCountMethod(ClassDefinition classDefinition, int channelCount)
    {
        classDefinition.declareMethod(new CompilerContext(bootstrapMethod),
                a(PUBLIC),
                "getChannelCount",
                type(int.class))
                .getBody()
                .push(channelCount)
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                .retInt();
    }

    private void generateAppendToMethod(ClassDefinition classDefinition, List<FieldDefinition> blockFields, FieldDefinition positionField)
    {
        Block appendToBody = classDefinition.declareMethod(new CompilerContext(bootstrapMethod),
                a(PUBLIC),
                "appendTo",
                type(void.class),
                arg("pageBuilder", PageBuilder.class))
                .getBody();
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        appendToBody.ret();
    }

    private void generateAdvanceNextPosition(ClassDefinition classDefinition, FieldDefinition positionField, FieldDefinition positionCountField)
    {
        CompilerContext compilerContext = new CompilerContext(bootstrapMethod);
        Block advanceNextPositionBody = classDefinition.declareMethod(compilerContext,
                a(PUBLIC),
                "advanceNextPosition",
                type(boolean.class))
                .getBody();
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    private void generateGetCurrentJoinPosition(ClassDefinition classDefinition,
            FieldDefinition lookupSourceField,
            FieldDefinition probeBlockArrayField,
            FieldDefinition positionField)
    {
        CompilerContext compilerContext = new CompilerContext(bootstrapMethod);
        classDefinition.declareMethod(compilerContext,
                a(PUBLIC),
                "getCurrentJoinPosition",
                type(long.class))
                .getBody()
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                .retLong();
    }

    private void generateCurrentRowContainsNull(ClassDefinition classDefinition, List<FieldDefinition> probeBlockFields, FieldDefinition positionField)
    {
        Block body = classDefinition.declareMethod(new CompilerContext(bootstrapMethod),
                a(PRIVATE),
                "currentRowContainsNull",
                type(boolean.class))
                .getBody();
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            ...

            // repeat with next sequence of constant expressions
         */

        CompilerContext context = generatorContext.getContext();

        // process value, else, and all when clauses
        RowExpression value = arguments.get(0);
        ByteCodeNode valueBytecode = generatorContext.generate(value);
        ByteCodeNode elseValue;

        List<RowExpression> whenClauses;
        RowExpression last = arguments.get(arguments.size() - 1);
        if (last instanceof CallExpression && ((CallExpression) last).getSignature().getName().equals("WHEN")) {
            whenClauses = arguments.subList(1, arguments.size());
            elseValue = new Block(context)
                    .putVariable("wasNull", true)
                    .pushJavaDefault(returnType.getJavaType());
        }
        else {
            whenClauses = arguments.subList(1, arguments.size() - 1);
            elseValue = generatorContext.generate(last);
        }

        // determine the type of the value and result
        Class<?> valueType = value.getType().getJavaType();

        // evaluate the value and store it in a variable
        LabelNode nullValue = new LabelNode("nullCondition");
        Variable tempVariable = context.createTempVariable(valueType);
        Block block = new Block(context)
                .append(valueBytecode)
                .append(ByteCodeUtils.ifWasNullClearPopAndGoto(context, nullValue, void.class, valueType))
                .putVariable(tempVariable.getLocalVariableDefinition());

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            DynamicClassLoader classLoader,
            TimeZoneKey timeZoneKey)
    {
        BootstrapEntry bootstrap = BootstrapEntry.makeBootstrap(classLoader, metadata);

        ClassDefinition classDefinition = new ClassDefinition(new CompilerContext(bootstrap.getBootstrapMethod()),
                a(PUBLIC, FINAL),
                typeFromPathName("FilterAndProjectOperator_" + CLASS_ID.incrementAndGet()),
                type(AbstractFilterAndProjectOperator.class));

        // declare fields
        FieldDefinition sessionField = classDefinition.declareField(a(PRIVATE, FINAL), "session", ConnectorSession.class);

        // constructor
        classDefinition.declareConstructor(new CompilerContext(bootstrap.getBootstrapMethod()),
                a(PUBLIC),
                arg("operatorContext", OperatorContext.class),
                arg("types", type(Iterable.class, Type.class)))
                .getBody()
                .comment("super(operatorContext, types);")
                .pushThis()
                .getVariable("operatorContext")
                .getVariable("types")
                .invokeConstructor(AbstractFilterAndProjectOperator.class, OperatorContext.class, Iterable.class)
                .comment("this.session = operatorContext.getSession();")
                .pushThis()
                .getVariable("operatorContext")
                .invokeVirtual(OperatorContext.class, "getSession", ConnectorSession.class)
                .putField(sessionField)
                .ret();

        generateFilterAndProjectRowOriented(bootstrap, classDefinition, projections, expressionTypes);

        //
        // filter method
        //
        generateFilterMethod(bootstrap, classDefinition, filter, expressionTypes, true, timeZoneKey);
        generateFilterMethod(bootstrap, classDefinition, filter, expressionTypes, false, timeZoneKey);

        //
        // project methods
        //
        List<Type> types = new ArrayList<>();
        int projectionIndex = 0;
        for (Expression projection : projections) {
            generateProjectMethod(bootstrap, classDefinition, "project_" + projectionIndex, projection, expressionTypes, true, timeZoneKey);
            generateProjectMethod(bootstrap, classDefinition, "project_" + projectionIndex, projection, expressionTypes, false, timeZoneKey);
            types.add(expressionTypes.get(projection));
            projectionIndex++;
        }

        //
        // toString method
        //
        classDefinition.declareMethod(new CompilerContext(bootstrap.getBootstrapMethod()), a(PUBLIC), "toString", type(String.class))
                .getBody()
                .push(toStringHelper(classDefinition.getType().getJavaClassName())
                        .add("filter", filter)
                        .add("projections", projections)
                        .toString())
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            DynamicClassLoader classLoader,
            TimeZoneKey timeZoneKey)
    {
        BootstrapEntry bootstrap = BootstrapEntry.makeBootstrap(classLoader, metadata);

        ClassDefinition classDefinition = new ClassDefinition(new CompilerContext(bootstrap.getBootstrapMethod()),
                a(PUBLIC, FINAL),
                typeFromPathName("ScanFilterAndProjectOperator_" + CLASS_ID.incrementAndGet()),
                type(AbstractScanFilterAndProjectOperator.class));

        // declare fields
        FieldDefinition sessionField = classDefinition.declareField(a(PRIVATE, FINAL), "session", ConnectorSession.class);

        // constructor
        classDefinition.declareConstructor(new CompilerContext(bootstrap.getBootstrapMethod()),
                a(PUBLIC),
                arg("operatorContext", OperatorContext.class),
                arg("sourceId", PlanNodeId.class),
                arg("dataStreamProvider", DataStreamProvider.class),
                arg("columns", type(Iterable.class, ColumnHandle.class)),
                arg("types", type(Iterable.class, Type.class)))
                .getBody()
                .comment("super(operatorContext, sourceId, dataStreamProvider, columns, types);")
                .pushThis()
                .getVariable("operatorContext")
                .getVariable("sourceId")
                .getVariable("dataStreamProvider")
                .getVariable("columns")
                .getVariable("types")
                .invokeConstructor(AbstractScanFilterAndProjectOperator.class, OperatorContext.class, PlanNodeId.class, DataStreamProvider.class, Iterable.class, Iterable.class)
                .comment("this.session = operatorContext.getSession();")
                .pushThis()
                .getVariable("operatorContext")
                .invokeVirtual(OperatorContext.class, "getSession", ConnectorSession.class)
                .putField(sessionField)
                .ret();

        generateFilterAndProjectRowOriented(bootstrap, classDefinition, projections, expressionTypes);
        generateFilterAndProjectCursorMethod(bootstrap, classDefinition, projections);

        //
        // filter method
        //
        generateFilterMethod(bootstrap, classDefinition, filter, expressionTypes, true, timeZoneKey);
        generateFilterMethod(bootstrap, classDefinition, filter, expressionTypes, false, timeZoneKey);

        //
        // project methods
        //
        List<Type> types = new ArrayList<>();
        int projectionIndex = 0;
        for (Expression projection : projections) {
            generateProjectMethod(bootstrap, classDefinition, "project_" + projectionIndex, projection, expressionTypes, true, timeZoneKey);
            generateProjectMethod(bootstrap, classDefinition, "project_" + projectionIndex, projection, expressionTypes, false, timeZoneKey);
            types.add(expressionTypes.get(projection));
            projectionIndex++;
        }

        //
        // toString method
        //
        classDefinition.declareMethod(new CompilerContext(bootstrap.getBootstrapMethod()), a(PUBLIC), "toString", type(String.class))
                .getBody()
                .push(toStringHelper(classDefinition.getType().getJavaClassName())
                        .add("filter", filter)
                        .add("projections", projections)
                        .toString())
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