Package com.facebook.presto.byteCode.instruction

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

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    }

    @Override
    public ByteCodeNode getByteCode()
    {
        LabelNode trueLabel = new LabelNode("true");
        LabelNode endLabel = new LabelNode("end");
        return new Block(null)
                .append(value)
                .ifTrueGoto(trueLabel)
                .push(true)
                .gotoLabel(endLabel)
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        // 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);
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        MethodType methodType = binding.getType();

        Signature signature = function.getSignature();
        Class<?> unboxedReturnType = Primitives.unwrap(methodType.returnType());

        LabelNode end = new LabelNode("end");
        Block block = new Block(context)
                .setDescription("invoke " + signature);

        List<Class<?>> stackTypes = new ArrayList<>();

        int index = 0;
        for (Class<?> type : methodType.parameterArray()) {
            stackTypes.add(type);
            if (type == ConnectorSession.class) {
                block.getVariable("session");
            }
            else {
                block.append(arguments.get(index));
                if (!function.getNullableArguments().get(index)) {
                    block.append(ifWasNullPopAndGoto(context, end, unboxedReturnType, Lists.reverse(stackTypes)));
                }
                else {
                    block.append(boxPrimitiveIfNecessary(context, type));
                    block.putVariable("wasNull", false);
                }
                index++;
            }
        }
        block.append(invoke(context, binding, function.getSignature()));

        if (function.isNullable()) {
            if (unboxedReturnType.isPrimitive()) {
                LabelNode notNull = new LabelNode("notNull");
                block.dup(methodType.returnType())
                        .ifNotNullGoto(notNull)
                        .putVariable("wasNull", true)
                        .comment("swap boxed null with unboxed default")
                        .pop(methodType.returnType())
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        IfStatement.IfStatementBuilder ifLeftIsNull = ifStatementBuilder(context)
                .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 leftIsFalse = new LabelNode("leftIsFalse");
        ifLeftIsNull.ifFalse(new Block(context)
                .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.build());

        // 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.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 true, pop left null flag off stack, push true and goto end")
                .ifFalseGoto(rightIsTrue)
                .pop(boolean.class)
                .push(true)
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    }

    @Override
    public ByteCodeNode getByteCode()
    {
        LabelNode falseLabel = new LabelNode("false");
        LabelNode endLabel = new LabelNode("end");
        return new Block(null)
                .append(condition)
                .ifFalseGoto(falseLabel)
                .append(ifTrue)
                .gotoLabel(endLabel)
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            }
        }
        ImmutableListMultimap<Integer, ByteCodeNode> hashBuckets = hashBucketsBuilder.build();
        ImmutableSet<Object> constantValues = constantValuesBuilder.build();

        LabelNode end = new LabelNode("end");
        LabelNode match = new LabelNode("match");
        LabelNode noMatch = new LabelNode("noMatch");

        LabelNode defaultLabel = new LabelNode("default");

        CompilerContext context = generatorContext.getContext();

        ByteCodeNode switchBlock;
        if (constantValues.size() < 1000) {
            Block switchCaseBlocks = new Block(context);
            LookupSwitch.LookupSwitchBuilder switchBuilder = lookupSwitchBuilder();
            for (Map.Entry<Integer, Collection<ByteCodeNode>> bucket : hashBuckets.asMap().entrySet()) {
                LabelNode label = new LabelNode("inHash" + bucket.getKey());
                switchBuilder.addCase(bucket.getKey(), label);
                Collection<ByteCodeNode> testValues = bucket.getValue();

                Block caseBlock = buildInCase(generatorContext, context, type, label, match, defaultLabel, testValues, false);
                switchCaseBlocks
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        if (checkForNulls) {
            caseBlock.putVariable(caseWasNull, false);
        }

        LabelNode elseLabel = new LabelNode("else");
        Block elseBlock = new Block(context)
                .visitLabel(elseLabel);

        if (checkForNulls) {
            elseBlock.getVariable(caseWasNull)
                    .putVariable("wasNull");
        }

        elseBlock.gotoLabel(noMatchLabel);

        FunctionInfo operator = generatorContext.getRegistry().resolveOperator(OperatorType.EQUAL, ImmutableList.of(type, type));

        Binding equalsFunction = generatorContext
                .getCallSiteBinder()
                .bind(operator.getMethodHandle());

        ByteCodeNode elseNode = elseBlock;
        for (ByteCodeNode testNode : testValues) {
            LabelNode testLabel = new LabelNode("test");
            IfStatement.IfStatementBuilder test = ifStatementBuilder(context);

            Block condition = new Block(context)
                    .visitLabel(testLabel)
                    .dup(type.getJavaType())
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                .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)
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        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))
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        }

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

        Block loopBody = new Block(context);

        ForLoopBuilder loop = ForLoop.forLoopBuilder(context)
                .initialize(NOP)
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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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