Package com.facebook.presto.byteCode

Examples of com.facebook.presto.byteCode.MethodDefinition

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            String methodName,
            Expression projection,
            Map<Input, Type> inputTypes,
            boolean sourceIsCursor)
    {
        MethodDefinition projectionMethod;
        if (sourceIsCursor) {
            projectionMethod = classDefinition.declareMethod(new CompilerContext(bootstrapMethod),
                    a(PUBLIC),
                    methodName,
                    type(void.class),
                    arg("cursor", RecordCursor.class),
                    arg("output", BlockBuilder.class));
        }
        else {
            ImmutableList.Builder<NamedParameterDefinition> parameters = ImmutableList.builder();
            parameters.addAll(toTupleReaderParameters(inputTypes));
            parameters.add(arg("output", BlockBuilder.class));

            projectionMethod = classDefinition.declareMethod(new CompilerContext(bootstrapMethod),
                    a(PUBLIC),
                    methodName,
                    type(void.class),
                    parameters.build());
        }

        projectionMethod.comment("Projection: %s", projection.toString());

        // generate body code
        CompilerContext context = projectionMethod.getCompilerContext();
        context.declareVariable(type(boolean.class), "wasNull");
        Block getSessionByteCode = new Block(context).pushThis().getField(classDefinition.getType(), "session", type(Session.class));
        TypedByteCodeNode body = new ByteCodeExpressionVisitor(bootstrapFunctionBinder, inputTypes, getSessionByteCode, sourceIsCursor).process(projection, context);

        if (body.getType() != void.class) {
            projectionMethod
                    .getBody()
                    .comment("boolean wasNull = false;")
                    .putVariable("wasNull", false)
                    .getVariable("output")
                    .append(body.getNode());

            Block notNullBlock = new Block(context);
            if (body.getType() == boolean.class) {
                notNullBlock
                        .comment("output.append(<booleanStackValue>);")
                        .invokeVirtual(BlockBuilder.class, "append", BlockBuilder.class, boolean.class)
                        .pop();
            }
            else if (body.getType() == long.class) {
                notNullBlock
                        .comment("output.append(<longStackValue>);")
                        .invokeVirtual(BlockBuilder.class, "append", BlockBuilder.class, long.class)
                        .pop();
            }
            else if (body.getType() == double.class) {
                notNullBlock
                        .comment("output.append(<doubleStackValue>);")
                        .invokeVirtual(BlockBuilder.class, "append", BlockBuilder.class, double.class)
                        .pop();
            }
            else if (body.getType() == Slice.class) {
                notNullBlock
                        .comment("output.append(<sliceStackValue>);")
                        .invokeVirtual(BlockBuilder.class, "append", BlockBuilder.class, Slice.class)
                        .pop();
            }
            else {
                throw new UnsupportedOperationException("Type " + body.getType() + " can not be output yet");
            }

            Block nullBlock = new Block(context)
                    .comment("output.appendNull();")
                    .pop(body.getType())
                    .invokeVirtual(BlockBuilder.class, "appendNull", BlockBuilder.class)
                    .pop();

            projectionMethod.getBody()
                    .comment("if the result was null, appendNull; otherwise append the value")
                    .append(new IfStatement(context, new Block(context).getVariable("wasNull"), nullBlock, notNullBlock))
                    .ret();
        }
        else {
            projectionMethod
                    .getBody()
                    .comment("output.appendNull();")
                    .getVariable("output")
                    .invokeVirtual(BlockBuilder.class, "appendNull", BlockBuilder.class)
                    .pop()
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    }

    private void generateProcessMethod(ClassDefinition classDefinition, int projections)
    {
        CompilerContext context = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition method = classDefinition.declareMethod(context,
                a(PUBLIC),
                "process",
                type(int.class),
                arg("session", ConnectorSession.class),
                arg("cursor", RecordCursor.class),
                arg("count", int.class),
                arg("pageBuilder", PageBuilder.class));

        Variable sessionVariable = context.getVariable("session");
        Variable cursorVariable = context.getVariable("cursor");
        Variable countVariable = context.getVariable("count");
        Variable pageBuilderVariable = context.getVariable("pageBuilder");

        Variable completedPositionsVariable = context.declareVariable(int.class, "completedPositions");

        method.getBody()
                .comment("int completedPositions = 0;")
                .putVariable(completedPositionsVariable, 0);

        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");
        ForLoopBuilder forLoop = ForLoop.forLoopBuilder(context)
                .initialize(NOP)
                .condition(new Block(context)
                                .comment("completedPositions < count")
                                .getVariable(completedPositionsVariable)
                                .getVariable(countVariable)
                                .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(context)
                                .comment("completedPositions++")
                                .incrementVariable(completedPositionsVariable, (byte) 1)
                );

        Block forLoopBody = new Block(context)
                .comment("if (pageBuilder.isFull()) break;")
                .append(new Block(context)
                        .getVariable(pageBuilderVariable)
                        .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                        .ifTrueGoto(done))
                .comment("if (!cursor.advanceNextPosition()) break;")
                .append(new Block(context)
                        .getVariable(cursorVariable)
                        .invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
                        .ifFalseGoto(done));

        forLoop.body(forLoopBody);

        // if (filter(cursor))
        IfStatementBuilder ifStatement = new IfStatementBuilder(context);
        ifStatement.condition(new Block(context)
                .pushThis()
                .getVariable(sessionVariable)
                .getVariable(cursorVariable)
                .invokeVirtual(classDefinition.getType(), "filter", type(boolean.class), type(ConnectorSession.class), type(RecordCursor.class)));

        Block trueBlock = new Block(context);
        ifStatement.ifTrue(trueBlock);
        if (projections == 0) {
            // pageBuilder.declarePosition();
            trueBlock.getVariable(pageBuilderVariable)
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // this.project_43(session, cursor, pageBuilder.getBlockBuilder(42)));
            for (int projectionIndex = 0; projectionIndex < projections; projectionIndex++) {
                trueBlock.pushThis()
                        .getVariable(sessionVariable)
                        .getVariable(cursorVariable);

                // pageBuilder.getBlockBuilder(0)
                trueBlock.getVariable(pageBuilderVariable)
                        .push(projectionIndex)
                        .invokeVirtual(PageBuilder.class, "getBlockBuilder", BlockBuilder.class, int.class);

                // project(block..., blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        type(ConnectorSession.class),
                        type(RecordCursor.class),
                        type(BlockBuilder.class));
            }
        }
        forLoopBody.append(ifStatement.build());

        method.getBody()
                .append(forLoop.build())
                .visitLabel(done)
                .comment("return completedPositions;")
                .getVariable(completedPositionsVariable)
                .retInt();
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    }

    private void generateFilterMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, RowExpression filter)
    {
        CompilerContext context = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition method = classDefinition.declareMethod(
                context,
                a(PUBLIC),
                "filter",
                type(boolean.class),
                arg("session", ConnectorSession.class),
                arg("cursor", RecordCursor.class));

        method.comment("Filter: %s", filter);

        Variable wasNullVariable = context.declareVariable(type(boolean.class), "wasNull");
        Variable cursorVariable = context.getVariable("cursor");

        ByteCodeExpressionVisitor visitor = new ByteCodeExpressionVisitor(callSiteBinder, fieldReferenceCompiler(cursorVariable, wasNullVariable), metadata.getFunctionRegistry());

        LabelNode end = new LabelNode("end");
        method.getBody()
                .comment("boolean wasNull = false;")
                .putVariable(wasNullVariable, false)
                .comment("evaluate filter: " + filter)
                .append(filter.accept(visitor, context))
                .comment("if (wasNull) return false;")
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    }

    private void generateProjectMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, String methodName, RowExpression projection)
    {
        CompilerContext context = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition method = classDefinition.declareMethod(context,
                a(PUBLIC),
                methodName,
                type(void.class),
                arg("session", ConnectorSession.class),
                arg("cursor", RecordCursor.class),
                arg("output", BlockBuilder.class));

        method.comment("Projection: %s", projection.toString());

        Variable outputVariable = context.getVariable("output");

        Variable cursorVariable = context.getVariable("cursor");
        Variable wasNullVariable = context.declareVariable(type(boolean.class), "wasNull");

        Block body = method.getBody()
                .comment("boolean wasNull = false;")
                .putVariable(wasNullVariable, false);

        ByteCodeExpressionVisitor visitor = new ByteCodeExpressionVisitor(callSiteBinder, fieldReferenceCompiler(cursorVariable, wasNullVariable), metadata.getFunctionRegistry());
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    }

    private void generateProcessMethod(ClassDefinition classDefinition, RowExpression filter, List<RowExpression> projections)
    {
        CompilerContext context = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition method = classDefinition.declareMethod(context,
                a(PUBLIC),
                "process",
                type(int.class),
                arg("session", ConnectorSession.class),
                arg("page", Page.class),
                arg("start", int.class),
                arg("end", int.class),
                arg("pageBuilder", PageBuilder.class));

        Variable sessionVariable = context.getVariable("session");
        Variable pageVariable = context.getVariable("page");
        Variable startVariable = context.getVariable("start");
        Variable endVariable = context.getVariable("end");
        Variable pageBuilderVariable = context.getVariable("pageBuilder");

        Variable positionVariable = context.declareVariable(int.class, "position");

        method.getBody()
                .comment("int position = start;")
                .getVariable(startVariable)
                .putVariable(positionVariable);

        List<Integer> allInputChannels = getInputChannels(Iterables.concat(projections, ImmutableList.of(filter)));
        for (int channel : allInputChannels) {
            Variable blockVariable = context.declareVariable(com.facebook.presto.spi.block.Block.class, "block_" + channel);
            method.getBody()
                    .comment("Block %s = page.getBlock(%s);", blockVariable.getName(), channel)
                    .getVariable(pageVariable)
                    .push(channel)
                    .invokeVirtual(Page.class, "getBlock", com.facebook.presto.spi.block.Block.class, int.class)
                    .putVariable(blockVariable);
        }

        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");

        Block loopBody = new Block(context);

        ForLoopBuilder loop = ForLoop.forLoopBuilder(context)
                .initialize(NOP)
                .condition(new Block(context)
                                .comment("position < end")
                                .getVariable(positionVariable)
                                .getVariable(endVariable)
                                .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(context)
                        .comment("position++")
                        .incrementVariable(positionVariable, (byte) 1))
                .body(loopBody);

        loopBody.comment("if (pageBuilder.isFull()) break;")
                .getVariable(pageBuilderVariable)
                .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                .ifTrueGoto(done);

        // if (filter(cursor))
        IfStatementBuilder filterBlock = new IfStatementBuilder(context);

        Block trueBlock = new Block(context);
        filterBlock.condition(new Block(context)
                .pushThis()
                .getVariable(sessionVariable)
                .append(pushBlockVariables(context, getInputChannels(filter)))
                .getVariable(positionVariable)
                .invokeVirtual(classDefinition.getType(),
                        "filter",
                        type(boolean.class),
                        ImmutableList.<ParameterizedType>builder()
                                .add(type(ConnectorSession.class))
                                .addAll(nCopies(getInputChannels(filter).size(), type(com.facebook.presto.spi.block.Block.class)))
                                .add(type(int.class))
                                .build()))
                .ifTrue(trueBlock);

        if (projections.size() == 0) {
            trueBlock.getVariable(pageBuilderVariable)
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                List<Integer> inputChannels = getInputChannels(projections.get(projectionIndex));

                trueBlock.pushThis()
                        .getVariable(sessionVariable)
                        .append(pushBlockVariables(context, inputChannels))
                        .getVariable(positionVariable);

                trueBlock.comment("pageBuilder.getBlockBuilder(" + projectionIndex + ")")
                        .getVariable(pageBuilderVariable)
                        .push(projectionIndex)
                        .invokeVirtual(PageBuilder.class, "getBlockBuilder", BlockBuilder.class, int.class);

                trueBlock.comment("project_" + projectionIndex + "(session, block_" + inputChannels + ", position, blockBuilder)")
                        .invokeVirtual(classDefinition.getType(),
                                "project_" + projectionIndex,
                                type(void.class),
                                ImmutableList.<ParameterizedType>builder()
                                        .add(type(ConnectorSession.class))
                                        .addAll(nCopies(inputChannels.size(), type(com.facebook.presto.spi.block.Block.class)))
                                        .add(type(int.class))
                                        .add(type(BlockBuilder.class))
                                        .build());
            }
        }
        loopBody.append(filterBlock.build());

        method.getBody()
                .append(loop.build())
                .visitLabel(done)
                .comment("return position;")
                .getVariable(positionVariable)
                .retInt();
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    }

    private void generateFilterMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, RowExpression filter)
    {
        CompilerContext context = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition method = classDefinition.declareMethod(context,
                a(PUBLIC),
                "filter",
                type(boolean.class),
                ImmutableList.<NamedParameterDefinition>builder()
                        .add(arg("session", ConnectorSession.class))
                        .addAll(toBlockParameters(getInputChannels(filter)))
                        .add(arg("position", int.class))
                        .build());

        method.comment("Filter: %s", filter.toString());

        Variable positionVariable = context.getVariable("position");
        Variable wasNullVariable = context.declareVariable(type(boolean.class), "wasNull");

        ByteCodeExpressionVisitor visitor = new ByteCodeExpressionVisitor(
                callSiteBinder,
                fieldReferenceCompiler(callSiteBinder, positionVariable, wasNullVariable),
                metadata.getFunctionRegistry());
        ByteCodeNode body = filter.accept(visitor, context);

        LabelNode end = new LabelNode("end");
        method
                .getBody()
                .comment("boolean wasNull = false;")
                .putVariable(wasNullVariable, false)
                .append(body)
                .getVariable(wasNullVariable)
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    }

    private void generateProjectMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, String methodName, RowExpression projection)
    {
        CompilerContext context = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition method = classDefinition.declareMethod(context,
                a(PUBLIC),
                methodName,
                type(void.class),
                ImmutableList.<NamedParameterDefinition>builder()
                        .add(arg("session", ConnectorSession.class))
                        .addAll(toBlockParameters(getInputChannels(projection)))
                        .add(arg("position", int.class))
                        .add(arg("output", BlockBuilder.class))
                        .build());

        method.comment("Projection: %s", projection.toString());

        Variable positionVariable = context.getVariable("position");
        Variable outputVariable = context.getVariable("output");

        Variable wasNullVariable = context.declareVariable(type(boolean.class), "wasNull");

        Block body = method.getBody()
                .comment("boolean wasNull = false;")
                .putVariable(wasNullVariable, projection.getType().getJavaType() == void.class);

        ByteCodeExpressionVisitor visitor = new ByteCodeExpressionVisitor(callSiteBinder, fieldReferenceCompiler(callSiteBinder, positionVariable, wasNullVariable), metadata.getFunctionRegistry());
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    }

    private void generateHashPositionMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, List<Type> joinChannelTypes, List<FieldDefinition> joinChannelFields)
    {
        CompilerContext compilerContext = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition hashPositionMethod = classDefinition.declareMethod(compilerContext,
                a(PUBLIC),
                "hashPosition",
                type(int.class),
                arg("blockIndex", int.class),
                arg("blockPosition", int.class));

        Variable resultVariable = hashPositionMethod.getCompilerContext().declareVariable(int.class, "result");
        hashPositionMethod.getBody().push(0).putVariable(resultVariable);

        for (int index = 0; index < joinChannelTypes.size(); index++) {
            ByteCodeExpression type = constantType(compilerContext, callSiteBinder, joinChannelTypes.get(index));

            ByteCodeExpression block = compilerContext
                    .getVariable("this")
                    .getField(joinChannelFields.get(index))
                    .invoke("get", Object.class, compilerContext.getVariable("blockIndex"))
                    .cast(com.facebook.presto.spi.block.Block.class);

            hashPositionMethod
                    .getBody()
                    .getVariable(resultVariable)
                    .push(31)
                    .append(OpCode.IMUL)
                    .append(typeHashCode(compilerContext, type, block, compilerContext.getVariable("blockPosition")))
                    .append(OpCode.IADD)
                    .putVariable(resultVariable);
        }

        hashPositionMethod
                .getBody()
                .getVariable(resultVariable)
                .retInt();
    }
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    }

    private void generateHashRowMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, List<Type> joinChannelTypes, List<FieldDefinition> joinChannelFields)
    {
        CompilerContext compilerContext = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition hashPositionMethod = classDefinition.declareMethod(compilerContext,
                a(PUBLIC),
                "hashRow",
                type(int.class),
                arg("position", int.class),
                arg("blocks", com.facebook.presto.spi.block.Block[].class));

        Variable resultVariable = hashPositionMethod.getCompilerContext().declareVariable(int.class, "result");
        hashPositionMethod.getBody().push(0).putVariable(resultVariable);

        for (int index = 0; index < joinChannelTypes.size(); index++) {
            ByteCodeExpression type = constantType(compilerContext, callSiteBinder, joinChannelTypes.get(index));

            ByteCodeExpression block = compilerContext
                    .getVariable("blocks")
                    .getElement(index)
                    .cast(com.facebook.presto.spi.block.Block.class);

            hashPositionMethod
                    .getBody()
                    .getVariable(resultVariable)
                    .push(31)
                    .append(OpCode.IMUL)
                    .append(typeHashCode(compilerContext, type, block, compilerContext.getVariable("position")))
                    .append(OpCode.IADD)
                    .putVariable(resultVariable);
        }

        hashPositionMethod
                .getBody()
                .getVariable(resultVariable)
                .retInt();
    }
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            CallSiteBinder callSiteBinder,
            List<Type> joinChannelTypes,
            List<FieldDefinition> joinChannelFields)
    {
        CompilerContext compilerContext = new CompilerContext(BOOTSTRAP_METHOD);
        MethodDefinition hashPositionMethod = classDefinition.declareMethod(compilerContext,
                a(PUBLIC),
                "positionEqualsRow",
                type(boolean.class),
                arg("leftBlockIndex", int.class),
                arg("leftBlockPosition", int.class),
                arg("rightPosition", int.class),
                arg("rightBlocks", com.facebook.presto.spi.block.Block[].class));

        for (int index = 0; index < joinChannelTypes.size(); index++) {
            ByteCodeExpression type = constantType(compilerContext, callSiteBinder, joinChannelTypes.get(index));

            ByteCodeExpression leftBlock = compilerContext
                    .getVariable("this")
                    .getField(joinChannelFields.get(index))
                    .invoke("get", Object.class, compilerContext.getVariable("leftBlockIndex"))
                    .cast(com.facebook.presto.spi.block.Block.class);

            ByteCodeExpression rightBlock = compilerContext
                    .getVariable("rightBlocks")
                    .getElement(index);

            LabelNode checkNextField = new LabelNode("checkNextField");
            hashPositionMethod
                    .getBody()
                    .append(typeEquals(compilerContext,
                            type,
                            leftBlock,
                            compilerContext.getVariable("leftBlockPosition"),
                            rightBlock,
                            compilerContext.getVariable("rightPosition")))
                    .ifTrueGoto(checkNextField)
                    .push(false)
                    .retBoolean()
                    .visitLabel(checkNextField);
        }

        hashPositionMethod
                .getBody()
                .push(true)
                .retInt();
    }
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