Examples with Variable com.facebook.presto.bytecode.Variable used on opensource projects

Example 1 with Variable

use of com.facebook.presto.bytecode.Variable in project presto by prestodb.

the class OrCodeGenerator method generateExpression.

@Override
public BytecodeNode generateExpression(Signature signature, BytecodeGeneratorContext generator, Type returnType, List<RowExpression> arguments) {
    Preconditions.checkArgument(arguments.size() == 2);
    Variable wasNull = generator.wasNull();
    BytecodeBlock block = new BytecodeBlock().comment("OR").setDescription("OR");
    BytecodeNode left = generator.generate(arguments.get(0));
    BytecodeNode right = generator.generate(arguments.get(1));
    block.append(left);
    IfStatement ifLeftIsNull = new IfStatement("if left wasNull...").condition(wasNull);
    LabelNode end = new LabelNode("end");
    ifLeftIsNull.ifTrue(new BytecodeBlock().comment("clear the null flag, pop left value off stack, and push left null flag on the stack (true)").append(wasNull.set(constantFalse())).pop(// discard left value
    arguments.get(0).getType().getJavaType()).push(true));
    LabelNode leftIsFalse = new LabelNode("leftIsFalse");
    ifLeftIsNull.ifFalse(new BytecodeBlock().comment("if left is true, push true, and goto end").ifFalseGoto(leftIsFalse).push(true).gotoLabel(end).comment("left was false; push left null flag on the stack (false)").visitLabel(leftIsFalse).push(false));
    block.append(ifLeftIsNull);
    // At this point we know the left expression was either NULL or FALSE.  The stack contains a single boolean
    // value for this expression which indicates if the left value was NULL.
    // eval right!
    block.append(right);
    IfStatement ifRightIsNull = new IfStatement("if right wasNull...").condition(wasNull);
    // this leaves a single boolean on the stack which is ignored since the value in NULL
    ifRightIsNull.ifTrue().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().comment("if right is true, pop left null flag off stack, push true and goto end").ifFalseGoto(rightIsTrue).pop(boolean.class).push(true).gotoLabel(end).comment("right was false; store left null flag (on stack) in wasNull variable, and push false").visitLabel(rightIsTrue).putVariable(wasNull).push(false);
    block.append(ifRightIsNull).visitLabel(end);
    return block;
}

Example 2 with Variable

use of com.facebook.presto.bytecode.Variable in project presto by prestodb.

the class OrderingCompiler method generateCompareTo.

private static void generateCompareTo(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, List<Type> sortTypes, List<Integer> sortChannels, List<SortOrder> sortOrders) {
    Parameter pagesIndex = arg("pagesIndex", PagesIndex.class);
    Parameter leftPosition = arg("leftPosition", int.class);
    Parameter rightPosition = arg("rightPosition", int.class);
    MethodDefinition compareToMethod = classDefinition.declareMethod(a(PUBLIC), "compareTo", type(int.class), pagesIndex, leftPosition, rightPosition);
    Scope scope = compareToMethod.getScope();
    Variable valueAddresses = scope.declareVariable(LongArrayList.class, "valueAddresses");
    compareToMethod.getBody().comment("LongArrayList valueAddresses = pagesIndex.valueAddresses").append(valueAddresses.set(pagesIndex.invoke("getValueAddresses", LongArrayList.class)));
    Variable leftPageAddress = scope.declareVariable(long.class, "leftPageAddress");
    compareToMethod.getBody().comment("long leftPageAddress = valueAddresses.getLong(leftPosition)").append(leftPageAddress.set(valueAddresses.invoke("getLong", long.class, leftPosition)));
    Variable leftBlockIndex = scope.declareVariable(int.class, "leftBlockIndex");
    compareToMethod.getBody().comment("int leftBlockIndex = decodeSliceIndex(leftPageAddress)").append(leftBlockIndex.set(invokeStatic(SyntheticAddress.class, "decodeSliceIndex", int.class, leftPageAddress)));
    Variable leftBlockPosition = scope.declareVariable(int.class, "leftBlockPosition");
    compareToMethod.getBody().comment("int leftBlockPosition = decodePosition(leftPageAddress)").append(leftBlockPosition.set(invokeStatic(SyntheticAddress.class, "decodePosition", int.class, leftPageAddress)));
    Variable rightPageAddress = scope.declareVariable(long.class, "rightPageAddress");
    compareToMethod.getBody().comment("long rightPageAddress = valueAddresses.getLong(rightPosition);").append(rightPageAddress.set(valueAddresses.invoke("getLong", long.class, rightPosition)));
    Variable rightBlockIndex = scope.declareVariable(int.class, "rightBlockIndex");
    compareToMethod.getBody().comment("int rightBlockIndex = decodeSliceIndex(rightPageAddress)").append(rightBlockIndex.set(invokeStatic(SyntheticAddress.class, "decodeSliceIndex", int.class, rightPageAddress)));
    Variable rightBlockPosition = scope.declareVariable(int.class, "rightBlockPosition");
    compareToMethod.getBody().comment("int rightBlockPosition = decodePosition(rightPageAddress)").append(rightBlockPosition.set(invokeStatic(SyntheticAddress.class, "decodePosition", int.class, rightPageAddress)));
    for (int i = 0; i < sortChannels.size(); i++) {
        int sortChannel = sortChannels.get(i);
        SortOrder sortOrder = sortOrders.get(i);
        BytecodeBlock block = new BytecodeBlock().setDescription("compare channel " + sortChannel + " " + sortOrder);
        Type sortType = sortTypes.get(i);
        BytecodeExpression leftBlock = pagesIndex.invoke("getChannel", ObjectArrayList.class, constantInt(sortChannel)).invoke("get", Object.class, leftBlockIndex).cast(Block.class);
        BytecodeExpression rightBlock = pagesIndex.invoke("getChannel", ObjectArrayList.class, constantInt(sortChannel)).invoke("get", Object.class, rightBlockIndex).cast(Block.class);
        block.append(getStatic(SortOrder.class, sortOrder.name()).invoke("compareBlockValue", int.class, ImmutableList.of(Type.class, Block.class, int.class, Block.class, int.class), constantType(callSiteBinder, sortType), leftBlock, leftBlockPosition, rightBlock, rightBlockPosition));
        LabelNode equal = new LabelNode("equal");
        block.comment("if (compare != 0) return compare").dup().ifZeroGoto(equal).retInt().visitLabel(equal).pop(int.class);
        compareToMethod.getBody().append(block);
    }
    // values are equal
    compareToMethod.getBody().push(0).retInt();
}

Example 3 with Variable

use of com.facebook.presto.bytecode.Variable in project presto by prestodb.

the class PageProcessorCompiler method generateProjectRLEMethod.

private MethodDefinition generateProjectRLEMethod(ClassDefinition classDefinition, String methodName, RowExpression projection, MethodDefinition projectionMethod, MethodDefinition projectColumnar) {
    Parameter session = arg("session", ConnectorSession.class);
    Parameter page = arg("page", Page.class);
    Parameter selectedPositions = arg("selectedPositions", int[].class);
    Parameter pageBuilder = arg("pageBuilder", PageBuilder.class);
    Parameter projectionIndex = arg("projectionIndex", int.class);
    List<Parameter> params = ImmutableList.<Parameter>builder().add(session).add(page).add(selectedPositions).add(pageBuilder).add(projectionIndex).build();
    MethodDefinition method = classDefinition.declareMethod(a(PRIVATE), methodName, type(Block.class), params);
    BytecodeBlock body = method.getBody();
    Scope scope = method.getScope();
    Variable thisVariable = method.getThis();
    List<Integer> inputChannels = getInputChannels(projection);
    if (inputChannels.size() != 1 || !determinismEvaluator.isDeterministic(projection)) {
        body.append(thisVariable.invoke(projectColumnar, params).ret());
        return method;
    }
    Variable inputBlock = scope.declareVariable("inputBlock", body, page.invoke("getBlock", Block.class, constantInt(getOnlyElement(inputChannels))));
    body.append(new IfStatement().condition(inputBlock.instanceOf(RunLengthEncodedBlock.class)).ifFalse(thisVariable.invoke(projectColumnar, params).ret()));
    Variable valueBlock = scope.declareVariable("valueBlock", body, inputBlock.cast(RunLengthEncodedBlock.class).invoke("getValue", Block.class));
    Variable blockBuilder = scope.declareVariable("blockBuilder", body, pageBuilder.invoke("getBlockBuilder", BlockBuilder.class, projectionIndex));
    body.append(invokeProject(thisVariable, session, singletonList(valueBlock), constantInt(0), pageBuilder, projectionIndex, projectionMethod));
    Variable outputValueBlock = scope.declareVariable("outputValueBlock", body, blockBuilder.invoke("build", Block.class));
    body.append(newInstance(RunLengthEncodedBlock.class, outputValueBlock, selectedPositions.length()).ret());
    return method;
}

Example 4 with Variable

use of com.facebook.presto.bytecode.Variable in project presto by prestodb.

the class CursorProcessorCompiler method generateFilterMethod.

private void generateFilterMethod(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, CachedInstanceBinder cachedInstanceBinder, RowExpression filter) {
    PreGeneratedExpressions preGeneratedExpressions = generateMethodsForLambdaAndTry(classDefinition, callSiteBinder, cachedInstanceBinder, filter, "filter");
    Parameter session = arg("session", ConnectorSession.class);
    Parameter cursor = arg("cursor", RecordCursor.class);
    MethodDefinition method = classDefinition.declareMethod(a(PUBLIC), "filter", type(boolean.class), session, cursor);
    method.comment("Filter: %s", filter);
    Scope scope = method.getScope();
    Variable wasNullVariable = scope.declareVariable(type(boolean.class), "wasNull");
    BytecodeExpressionVisitor visitor = new BytecodeExpressionVisitor(callSiteBinder, cachedInstanceBinder, fieldReferenceCompiler(cursor), metadata.getFunctionRegistry(), preGeneratedExpressions);
    LabelNode end = new LabelNode("end");
    method.getBody().comment("boolean wasNull = false;").putVariable(wasNullVariable, false).comment("evaluate filter: " + filter).append(filter.accept(visitor, scope)).comment("if (wasNull) return false;").getVariable(wasNullVariable).ifFalseGoto(end).pop(boolean.class).push(false).visitLabel(end).retBoolean();
}

Example 5 with Variable

use of com.facebook.presto.bytecode.Variable in project presto by prestodb.

the class CursorProcessorCompiler method generateMethods.

@Override
public void generateMethods(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, RowExpression filter, List<RowExpression> projections) {
    CachedInstanceBinder cachedInstanceBinder = new CachedInstanceBinder(classDefinition, callSiteBinder);
    generateProcessMethod(classDefinition, projections.size());
    generateFilterMethod(classDefinition, callSiteBinder, cachedInstanceBinder, filter);
    for (int i = 0; i < projections.size(); i++) {
        generateProjectMethod(classDefinition, callSiteBinder, cachedInstanceBinder, "project_" + i, projections.get(i));
    }
    MethodDefinition constructorDefinition = classDefinition.declareConstructor(a(PUBLIC));
    BytecodeBlock constructorBody = constructorDefinition.getBody();
    Variable thisVariable = constructorDefinition.getThis();
    constructorBody.comment("super();").append(thisVariable).invokeConstructor(Object.class);
    cachedInstanceBinder.generateInitializations(thisVariable, constructorBody);
    constructorBody.ret();
}