Package com.facebook.presto.byteCode.control.ForLoop

Examples of com.facebook.presto.byteCode.control.ForLoop.ForLoopBuilder

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        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");
        ForLoopBuilder forLoop = ForLoop.forLoopBuilder(compilerContext)
                .initialize(NOP)
                .condition(new Block(compilerContext)
                        .comment("completedPositions < 16384")
                        .getVariable(completedPositionsVariable)
                        .push(16384)
                        .invokeStatic(Operations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(compilerContext)
                        .comment("completedPositions++")
                        .incrementVariable(completedPositionsVariable, (byte) 1)
                );

        Block forLoopBody = new Block(compilerContext);
        forLoop.body(forLoopBody);

        forLoopBody.comment("if (pageBuilder.isFull()) break;")
                .append(new Block(compilerContext)
                        .getVariable("pageBuilder")
                        .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                        .ifTrueGoto(done));

        forLoopBody.comment("if (!cursor.advanceNextPosition()) break;")
                .append(new Block(compilerContext)
                        .getVariable("cursor")
                        .invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
                        .ifFalseGoto(done));

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

        Block trueBlock = new Block(compilerContext);
        ifStatement.ifTrue(trueBlock);
        if (projections.isEmpty()) {
            // pageBuilder.declarePosition();
            trueBlock.getVariable("pageBuilder").invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // project_43(cursor_0, cursor_1, pageBuilder.getBlockBuilder(42)));
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.pushThis();
                trueBlock.getVariable("cursor");

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

                // project(cursor_0, cursor_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        type(RecordCursor.class),
                        type(BlockBuilder.class));
            }
        }
        forLoopBody.append(ifStatement.build());

        filterAndProjectMethod.getBody()
                .append(forLoop.build())
                .visitLabel(done)
                .comment("return completedPositions;")
                .getVariable("completedPositions")
                .retInt();
    }
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        //
        // for loop body
        //

        // for (position = 0; position < rows; position++)
        ForLoopBuilder forLoop = forLoopBuilder(compilerContext)
                .comment("for (position = 0; position < rows; position++)")
                .initialize(new Block(compilerContext).putVariable(positionVariable, 0))
                .condition(new Block(compilerContext)
                        .getVariable(positionVariable)
                        .getVariable(rowsVariable)
                        .invokeStatic(Operations.class, "lessThan", boolean.class, int.class, int.class))
                .update(new Block(compilerContext).incrementVariable(positionVariable, (byte) 1));

        Block forLoopBody = new Block(compilerContext);

        // cursor.advanceNextPosition()
        for (LocalVariableDefinition cursorVariable : cursorVariables) {
            forLoopBody
                    .comment("checkState(%s.advanceNextPosition());", cursorVariable.getName())
                    .getVariable(cursorVariable)
                    .invokeInterface(BlockCursor.class, "advanceNextPosition", boolean.class)
                    .invokeStatic(Preconditions.class, "checkState", void.class, boolean.class);
        }

        IfStatementBuilder ifStatement = new IfStatementBuilder(compilerContext)
                .comment("if (filter(cursors...)");
        Block condition = new Block(compilerContext);
        condition.pushThis();
        for (int channel = 0; channel < channels; channel++) {
            condition.getVariable("cursor_" + channel);
        }
        condition.invokeVirtual(classDefinition.getType(), "filter", type(boolean.class), nCopies(channels, type(TupleReadable.class)));
        ifStatement.condition(condition);

        Block trueBlock = new Block(compilerContext);
        if (projections.isEmpty()) {
            trueBlock
                    .comment("pageBuilder.declarePosition()")
                    .getVariable("pageBuilder")
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // pageBuilder.getBlockBuilder(0).append(cursor.getDouble(0);
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.comment("project_%s(cursors..., pageBuilder.getBlockBuilder(%s))", projectionIndex, projectionIndex);
                trueBlock.pushThis();
                for (int channel = 0; channel < channels; channel++) {
                    trueBlock.getVariable("cursor_" + channel);
                }

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

                // project(cursor_0, cursor_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        ImmutableList.<ParameterizedType>builder().addAll(nCopies(channels, type(TupleReadable.class))).add(type(BlockBuilder.class)).build());
            }
        }
        ifStatement.ifTrue(trueBlock);

        forLoopBody.append(ifStatement.build());
        filterAndProjectMethod.getBody().append(forLoop.body(forLoopBody).build());

        //
        //  Verify all cursors ended together
        //
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        //
        // for loop body
        //

        // for (position = 0; position < rows; position++)
        ForLoopBuilder forLoop = forLoopBuilder(compilerContext)
                .comment("for (position = 0; position < rows; position++)")
                .initialize(new Block(compilerContext).putVariable(positionVariable, 0))
                .condition(new Block(compilerContext)
                        .getVariable(positionVariable)
                        .getVariable(rowsVariable)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class))
                .update(new Block(compilerContext).incrementVariable(positionVariable, (byte) 1));

        Block forLoopBody = new Block(compilerContext);

        IfStatementBuilder ifStatement = new IfStatementBuilder(compilerContext)
                .comment("if (filter(position, blocks...)");
        Block condition = new Block(compilerContext);
        condition.pushThis();
        condition.getVariable(positionVariable);
        List<Integer> filterInputChannels = getInputChannels(filter);
        for (int channel : filterInputChannels) {
            condition.getVariable("block_" + channel);
        }
        condition.invokeVirtual(classDefinition.getType(),
                "filter",
                type(boolean.class),
                ImmutableList.<ParameterizedType>builder()
                        .add(type(int.class))
                        .addAll(nCopies(filterInputChannels.size(), type(com.facebook.presto.spi.block.Block.class)))
                        .build());
        ifStatement.condition(condition);

        Block trueBlock = new Block(compilerContext);
        if (projections.isEmpty()) {
            trueBlock
                    .comment("pageBuilder.declarePosition()")
                    .getVariable("pageBuilder")
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // pageBuilder.getBlockBuilder(0).append(block.getDouble(0);
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.comment("project_%s(position, blocks..., pageBuilder.getBlockBuilder(%s))", projectionIndex, projectionIndex);
                trueBlock.pushThis();
                List<Integer> projectionInputs = getInputChannels(projections.get(projectionIndex));
                trueBlock.getVariable(positionVariable);
                for (int channel : projectionInputs) {
                    trueBlock.getVariable("block_" + channel);
                }

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

                // project(position, block_0, block_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        ImmutableList.<ParameterizedType>builder()
                                .add(type(int.class))
                                .addAll(nCopies(projectionInputs.size(), type(com.facebook.presto.spi.block.Block.class)))
                                .add(type(BlockBuilder.class))
                                .build());
            }
        }
        ifStatement.ifTrue(trueBlock);

        forLoopBody.append(ifStatement.build());
        filterAndProjectMethod.getBody().append(forLoop.body(forLoopBody).build());

        filterAndProjectMethod.getBody().ret();
    }
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        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");
        ForLoopBuilder forLoop = ForLoop.forLoopBuilder(compilerContext)
                .initialize(NOP)
                .condition(new Block(compilerContext)
                        .comment("completedPositions < 16384")
                        .getVariable(completedPositionsVariable)
                        .push(16384)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(compilerContext)
                        .comment("completedPositions++")
                        .incrementVariable(completedPositionsVariable, (byte) 1)
                );

        Block forLoopBody = new Block(compilerContext);
        forLoop.body(forLoopBody);

        forLoopBody.comment("if (pageBuilder.isFull()) break;")
                .append(new Block(compilerContext)
                        .getVariable("pageBuilder")
                        .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                        .ifTrueGoto(done));

        forLoopBody.comment("if (!cursor.advanceNextPosition()) break;")
                .append(new Block(compilerContext)
                        .getVariable("cursor")
                        .invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
                        .ifFalseGoto(done));

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

        Block trueBlock = new Block(compilerContext);
        ifStatement.ifTrue(trueBlock);
        if (projections.isEmpty()) {
            // pageBuilder.declarePosition();
            trueBlock.getVariable("pageBuilder").invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // project_43(block..., pageBuilder.getBlockBuilder(42)));
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.pushThis();
                trueBlock.getVariable("cursor");

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

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

        filterAndProjectMethod.getBody()
                .append(forLoop.build())
                .visitLabel(done)
                .comment("return completedPositions;")
                .getVariable("completedPositions")
                .retInt();
    }
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        //
        // for loop body
        //

        // for (position = 0; position < rows; position++)
        ForLoopBuilder forLoop = forLoopBuilder(compilerContext)
                .comment("for (position = 0; position < rows; position++)")
                .initialize(new Block(compilerContext).putVariable(positionVariable, 0))
                .condition(new Block(compilerContext)
                        .getVariable(positionVariable)
                        .getVariable(rowsVariable)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class))
                .update(new Block(compilerContext).incrementVariable(positionVariable, (byte) 1));

        Block forLoopBody = new Block(compilerContext);

        // cursor.advanceNextPosition()
        for (LocalVariableDefinition cursorVariable : cursorVariables) {
            forLoopBody
                    .comment("checkState(%s.advanceNextPosition());", cursorVariable.getName())
                    .getVariable(cursorVariable)
                    .invokeInterface(BlockCursor.class, "advanceNextPosition", boolean.class)
                    .invokeStatic(Preconditions.class, "checkState", void.class, boolean.class);
        }

        IfStatementBuilder ifStatement = new IfStatementBuilder(compilerContext)
                .comment("if (filter(cursors...)");
        Block condition = new Block(compilerContext);
        condition.pushThis();
        for (int channel = 0; channel < channels; channel++) {
            condition.getVariable("cursor_" + channel);
        }
        condition.invokeVirtual(classDefinition.getType(), "filter", type(boolean.class), nCopies(channels, type(BlockCursor.class)));
        ifStatement.condition(condition);

        Block trueBlock = new Block(compilerContext);
        if (projections.isEmpty()) {
            trueBlock
                    .comment("pageBuilder.declarePosition()")
                    .getVariable("pageBuilder")
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // pageBuilder.getBlockBuilder(0).append(cursor.getDouble(0);
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.comment("project_%s(cursors..., pageBuilder.getBlockBuilder(%s))", projectionIndex, projectionIndex);
                trueBlock.pushThis();
                for (int channel = 0; channel < channels; channel++) {
                    trueBlock.getVariable("cursor_" + channel);
                }

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

                // project(cursor_0, cursor_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        ImmutableList.<ParameterizedType>builder().addAll(nCopies(channels, type(BlockCursor.class))).add(type(BlockBuilder.class)).build());
            }
        }
        ifStatement.ifTrue(trueBlock);

        forLoopBody.append(ifStatement.build());
        filterAndProjectMethod.getBody().append(forLoop.body(forLoopBody).build());

        //
        //  Verify all cursors ended together
        //
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        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");
        ForLoopBuilder forLoop = ForLoop.forLoopBuilder(compilerContext)
                .initialize(NOP)
                .condition(new Block(compilerContext)
                        .comment("completedPositions < 16384")
                        .getVariable(completedPositionsVariable)
                        .push(16384)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(compilerContext)
                        .comment("completedPositions++")
                        .incrementVariable(completedPositionsVariable, (byte) 1)
                );

        Block forLoopBody = new Block(compilerContext);
        forLoop.body(forLoopBody);

        forLoopBody.comment("if (pageBuilder.isFull()) break;")
                .append(new Block(compilerContext)
                        .getVariable("pageBuilder")
                        .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                        .ifTrueGoto(done));

        forLoopBody.comment("if (!cursor.advanceNextPosition()) break;")
                .append(new Block(compilerContext)
                        .getVariable("cursor")
                        .invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
                        .ifFalseGoto(done));

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

        Block trueBlock = new Block(compilerContext);
        ifStatement.ifTrue(trueBlock);
        if (projections.isEmpty()) {
            // pageBuilder.declarePosition();
            trueBlock.getVariable("pageBuilder").invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // project_43(cursor_0, cursor_1, pageBuilder.getBlockBuilder(42)));
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.pushThis();
                trueBlock.getVariable("cursor");

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

                // project(cursor_0, cursor_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        type(RecordCursor.class),
                        type(BlockBuilder.class));
            }
        }
        forLoopBody.append(ifStatement.build());

        filterAndProjectMethod.getBody()
                .append(forLoop.build())
                .visitLabel(done)
                .comment("return completedPositions;")
                .getVariable("completedPositions")
                .retInt();
    }
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        //
        // for loop body
        //

        // for (position = 0; position < rows; position++)
        ForLoopBuilder forLoop = forLoopBuilder(compilerContext)
                .comment("for (position = 0; position < rows; position++)")
                .initialize(new Block(compilerContext).putVariable(positionVariable, 0))
                .condition(new Block(compilerContext)
                        .getVariable(positionVariable)
                        .getVariable(rowsVariable)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class))
                .update(new Block(compilerContext).incrementVariable(positionVariable, (byte) 1));

        Block forLoopBody = new Block(compilerContext);

        // cursor.advanceNextPosition()
        for (LocalVariableDefinition cursorVariable : cursorVariables) {
            forLoopBody
                    .comment("checkState(%s.advanceNextPosition());", cursorVariable.getName())
                    .getVariable(cursorVariable)
                    .invokeInterface(BlockCursor.class, "advanceNextPosition", boolean.class)
                    .invokeStatic(Preconditions.class, "checkState", void.class, boolean.class);
        }

        IfStatementBuilder ifStatement = new IfStatementBuilder(compilerContext)
                .comment("if (filter(cursors...)");
        Block condition = new Block(compilerContext);
        condition.pushThis();
        List<Integer> filterInputChannels = getInputChannels(filter);
        for (int channel : filterInputChannels) {
            condition.getVariable("cursor_" + channel);
        }
        condition.invokeVirtual(classDefinition.getType(), "filter", type(boolean.class), nCopies(filterInputChannels.size(), type(BlockCursor.class)));
        ifStatement.condition(condition);

        Block trueBlock = new Block(compilerContext);
        if (projections.isEmpty()) {
            trueBlock
                    .comment("pageBuilder.declarePosition()")
                    .getVariable("pageBuilder")
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // pageBuilder.getBlockBuilder(0).append(cursor.getDouble(0);
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.comment("project_%s(cursors..., pageBuilder.getBlockBuilder(%s))", projectionIndex, projectionIndex);
                trueBlock.pushThis();
                List<Integer> projectionInputs = getInputChannels(projections.get(projectionIndex));
                for (int channel : projectionInputs) {
                    trueBlock.getVariable("cursor_" + channel);
                }

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

                // project(cursor_0, cursor_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        ImmutableList.<ParameterizedType>builder().addAll(nCopies(projectionInputs.size(), type(BlockCursor.class))).add(type(BlockBuilder.class)).build());
            }
        }
        ifStatement.ifTrue(trueBlock);

        forLoopBody.append(ifStatement.build());
        filterAndProjectMethod.getBody().append(forLoop.body(forLoopBody).build());

        //
        //  Verify all cursors ended together
        //
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        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");
        ForLoopBuilder forLoop = ForLoop.forLoopBuilder(compilerContext)
                .initialize(NOP)
                .condition(new Block(compilerContext)
                        .comment("completedPositions < 16384")
                        .getVariable(completedPositionsVariable)
                        .push(16384)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(compilerContext)
                        .comment("completedPositions++")
                        .incrementVariable(completedPositionsVariable, (byte) 1)
                );

        Block forLoopBody = new Block(compilerContext);
        forLoop.body(forLoopBody);

        forLoopBody.comment("if (pageBuilder.isFull()) break;")
                .append(new Block(compilerContext)
                        .getVariable("pageBuilder")
                        .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                        .ifTrueGoto(done));

        forLoopBody.comment("if (!cursor.advanceNextPosition()) break;")
                .append(new Block(compilerContext)
                        .getVariable("cursor")
                        .invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
                        .ifFalseGoto(done));

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

        Block trueBlock = new Block(compilerContext);
        ifStatement.ifTrue(trueBlock);
        if (projections.isEmpty()) {
            // pageBuilder.declarePosition();
            trueBlock.getVariable("pageBuilder").invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // project_43(cursor_0, cursor_1, pageBuilder.getBlockBuilder(42)));
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.pushThis();
                trueBlock.getVariable("cursor");

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

                // project(cursor_0, cursor_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        type(RecordCursor.class),
                        type(BlockBuilder.class));
            }
        }
        forLoopBody.append(ifStatement.build());

        filterAndProjectMethod.getBody()
                .append(forLoop.build())
                .visitLabel(done)
                .comment("return completedPositions;")
                .getVariable("completedPositions")
                .retInt();
    }
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        //
        // for loop body
        //

        // for (position = 0; position < rows; position++)
        ForLoopBuilder forLoop = forLoopBuilder(compilerContext)
                .comment("for (position = 0; position < rows; position++)")
                .initialize(new Block(compilerContext).putVariable(positionVariable, 0))
                .condition(new Block(compilerContext)
                        .getVariable(positionVariable)
                        .getVariable(rowsVariable)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class))
                .update(new Block(compilerContext).incrementVariable(positionVariable, (byte) 1));

        Block forLoopBody = new Block(compilerContext);

        IfStatementBuilder ifStatement = new IfStatementBuilder(compilerContext)
                .comment("if (filter(position, blocks...)");
        Block condition = new Block(compilerContext);
        condition.pushThis();
        condition.getVariable(positionVariable);
        List<Integer> filterInputChannels = getInputChannels(filter);
        for (int channel : filterInputChannels) {
            condition.getVariable("block_" + channel);
        }
        condition.invokeVirtual(classDefinition.getType(),
                "filter",
                type(boolean.class),
                ImmutableList.<ParameterizedType>builder()
                        .add(type(int.class))
                        .addAll(nCopies(filterInputChannels.size(), type(com.facebook.presto.spi.block.Block.class)))
                        .build());
        ifStatement.condition(condition);

        Block trueBlock = new Block(compilerContext);
        if (projections.isEmpty()) {
            trueBlock
                    .comment("pageBuilder.declarePosition()")
                    .getVariable("pageBuilder")
                    .invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // pageBuilder.getBlockBuilder(0).append(block.getDouble(0);
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.comment("project_%s(position, blocks..., pageBuilder.getBlockBuilder(%s))", projectionIndex, projectionIndex);
                trueBlock.pushThis();
                List<Integer> projectionInputs = getInputChannels(projections.get(projectionIndex));
                trueBlock.getVariable(positionVariable);
                for (int channel : projectionInputs) {
                    trueBlock.getVariable("block_" + channel);
                }

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

                // project(position, block_0, block_1, blockBuilder)
                trueBlock.invokeVirtual(classDefinition.getType(),
                        "project_" + projectionIndex,
                        type(void.class),
                        ImmutableList.<ParameterizedType>builder()
                                .add(type(int.class))
                                .addAll(nCopies(projectionInputs.size(), type(com.facebook.presto.spi.block.Block.class)))
                                .add(type(BlockBuilder.class))
                                .build());
            }
        }
        ifStatement.ifTrue(trueBlock);

        forLoopBody.append(ifStatement.build());
        filterAndProjectMethod.getBody().append(forLoop.body(forLoopBody).build());

        filterAndProjectMethod.getBody().ret();
    }
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        //
        // for loop loop body
        //
        LabelNode done = new LabelNode("done");
        ForLoopBuilder forLoop = ForLoop.forLoopBuilder(compilerContext)
                .initialize(NOP)
                .condition(new Block(compilerContext)
                        .comment("completedPositions < 16384")
                        .getVariable(completedPositionsVariable)
                        .push(16384)
                        .invokeStatic(CompilerOperations.class, "lessThan", boolean.class, int.class, int.class)
                )
                .update(new Block(compilerContext)
                        .comment("completedPositions++")
                        .incrementVariable(completedPositionsVariable, (byte) 1)
                );

        Block forLoopBody = new Block(compilerContext);
        forLoop.body(forLoopBody);

        forLoopBody.comment("if (pageBuilder.isFull()) break;")
                .append(new Block(compilerContext)
                        .getVariable("pageBuilder")
                        .invokeVirtual(PageBuilder.class, "isFull", boolean.class)
                        .ifTrueGoto(done));

        forLoopBody.comment("if (!cursor.advanceNextPosition()) break;")
                .append(new Block(compilerContext)
                        .getVariable("cursor")
                        .invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
                        .ifFalseGoto(done));

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

        Block trueBlock = new Block(compilerContext);
        ifStatement.ifTrue(trueBlock);
        if (projections.isEmpty()) {
            // pageBuilder.declarePosition();
            trueBlock.getVariable("pageBuilder").invokeVirtual(PageBuilder.class, "declarePosition", void.class);
        }
        else {
            // project_43(block..., pageBuilder.getBlockBuilder(42)));
            for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
                trueBlock.pushThis();
                trueBlock.getVariable("cursor");

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

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

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