Package com.facebook.presto.byteCode

Examples of com.facebook.presto.byteCode.Variable

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    // Generates a for-loop with a local variable named "position" defined, with the current position in the block,
    // loopBody will only be executed for non-null positions in the Block
    private static Block generateBlockNonNullPositionForLoop(CompilerContext context, Variable positionVariable, Block loopBody)
    {
        Variable rowsVariable = context.declareVariable(int.class, "rows");

        Block block = new Block(context)
                .getVariable("block")
                .invokeInterface(com.facebook.presto.spi.block.Block.class, "getPositionCount", int.class)
                .putVariable(rowsVariable);
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        CompilerContext context = new CompilerContext(null);
        Block body = definition.declareMethod(context, a(PUBLIC, STATIC), "mapConstructor", type(Slice.class), parameters.build())
                .getBody();

        Variable valuesVariable = context.declareVariable(Map.class, "values");
        body.comment("Map<Object, Object> values = new HashMap();")
                .newObject(HashMap.class)
                .dup()
                .invokeConstructor(HashMap.class)
                .putVariable(valuesVariable);
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        CompilerContext context = new CompilerContext(null);
        Block body = definition.declareMethod(context, a(PUBLIC, STATIC), "arrayConstructor", type(Slice.class), parameters.build())
                .getBody();

        Variable valuesVariable = context.declareVariable(List.class, "values");
        body.comment("List<Object> values = new ArrayList();")
                .newObject(ArrayList.class)
                .dup()
                .invokeConstructor(ArrayList.class)
                .putVariable(valuesVariable);
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            return coerceToType(context, elseValue, resultType);
        }

        // 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(coerceToType(context, value, valueType).getNode())
                .append(ifWasNullClearPopAndGoto(context, nullValue, void.class, valueType))
                .putVariable(tempVariable.getLocalVariableDefinition());

        // build the statements
        elseValue = typedByteCodeNode(new Block(context).visitLabel(nullValue).append(coerceToType(context, elseValue, resultType).getNode()), resultType);
        // reverse list because current if statement builder doesn't support if/else so we need to build the if statements bottom up
        for (TypedWhenClause whenClause : Lists.reverse(new ArrayList<>(whenClauses))) {
            LabelNode nullCondition = new LabelNode("nullCondition");
            Block condition = new Block(context)
                    .append(coerceToType(context, whenClause.condition, valueType).getNode())
                    .append(ifWasNullPopAndGoto(context, nullCondition, boolean.class, valueType))
                    .getVariable(tempVariable.getLocalVariableDefinition())
                    .invokeStatic(Operations.class, "equal", boolean.class, valueType, valueType)
                    .visitLabel(nullCondition)
                    .putVariable("wasNull", false);

            elseValue = typedByteCodeNode(new IfStatement(context,
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            LabelNode matchLabel,
            LabelNode noMatchLabel,
            Collection<TypedByteCodeNode> testValues,
            boolean checkForNulls)
    {
        Variable caseWasNull = null;
        if (checkForNulls) {
            caseWasNull = context.createTempVariable(boolean.class);
        }

        Block caseBlock = new Block(context)
                .visitLabel(caseLabel);

        if (checkForNulls) {
            caseBlock.putVariable(caseWasNull.getLocalVariableDefinition(), false);
        }

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

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

        elseBlock.gotoLabel(noMatchLabel);

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

            Block condition = new Block(context)
                    .visitLabel(testLabel)
                    .dup(type)
                    .append(coerceToType(context, testNode, type).getNode());

            if (checkForNulls) {
                condition.getVariable("wasNull")
                        .putVariable(caseWasNull.getLocalVariableDefinition())
                        .append(ifWasNullPopAndGoto(context, elseLabel, void.class, type, type));
            }
            condition.invokeStatic(Operations.class, "equal", boolean.class, type, type);
            test.condition(condition);
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        if (fields.size() == 1) {
            generatePrimitiveDeserializer(deserializerBody, getSetter(clazz, fields.get(0)));
        }
        else {
            Variable slice = compilerContext.declareVariable(Slice.class, "slice");
            deserializerBody.comment("Slice slice = block.getSlice(index, 0, block.getLength(index));")
                    .getVariable("block")
                    .getVariable("index")
                    .push(0)
                    .getVariable("block")
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        if (fields.size() == 1) {
            generatePrimitiveSerializer(serializerBody, getGetter(clazz, fields.get(0)));
        }
        else {
            Variable slice = compilerContext.declareVariable(Slice.class, "slice");
            int size = serializedSizeOf(clazz);
            serializerBody.comment("Slice slice = Slices.allocate(%d);", size)
                    .push(size)
                    .invokeStatic(Slices.class, "allocate", Slice.class, int.class)
                    .putVariable(slice);
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Related Classes of com.facebook.presto.byteCode.Variable

  • com.facebook.presto.byteCode.expression.TestSetFieldByteCodeExpression
  • com.facebook.presto.byteCode.expression.TestSetVariableByteCodeExpression
  • com.facebook.presto.byteCode.instruction.VariableInstruction
  • com.facebook.presto.operator.aggregation.AccumulatorCompiler
  • com.facebook.presto.operator.aggregation.state.StateCompiler
  • com.facebook.presto.operator.scalar.ArrayConstructor
  • com.facebook.presto.operator.scalar.MapConstructor
  • com.facebook.presto.sql.gen.ByteCodeExpressionVisitor
  • com.facebook.presto.sql.gen.ByteCodeUtils
  • com.facebook.presto.sql.gen.CursorProcessorCompiler
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