Examples with LabelNode com.facebook.presto.bytecode.instruction.LabelNode used on opensource projects

Example 1 with LabelNode

use of com.facebook.presto.bytecode.instruction.LabelNode in project presto by prestodb.

the class TryCatch method accept.

@Override
public void accept(MethodVisitor visitor, MethodGenerationContext generationContext) {
    LabelNode tryStart = new LabelNode("tryStart");
    LabelNode tryEnd = new LabelNode("tryEnd");
    LabelNode handler = new LabelNode("handler");
    LabelNode done = new LabelNode("done");
    BytecodeBlock block = new BytecodeBlock();
    // try block
    block.visitLabel(tryStart).append(tryNode).visitLabel(tryEnd).gotoLabel(done);
    // handler block
    block.visitLabel(handler).append(catchNode);
    // all done
    block.visitLabel(done);
    block.accept(visitor, generationContext);
    visitor.visitTryCatchBlock(tryStart.getLabel(), tryEnd.getLabel(), handler.getLabel(), exceptionName);
}

Example 2 with LabelNode

use of com.facebook.presto.bytecode.instruction.LabelNode in project presto by prestodb.

the class AndBytecodeExpression method getBytecode.

@Override
public BytecodeNode getBytecode(MethodGenerationContext generationContext) {
    LabelNode falseLabel = new LabelNode("false");
    LabelNode endLabel = new LabelNode("end");
    return new BytecodeBlock().append(left).ifFalseGoto(falseLabel).append(right).ifFalseGoto(falseLabel).push(true).gotoLabel(endLabel).visitLabel(falseLabel).push(false).visitLabel(endLabel);
}

Example 3 with LabelNode

use of com.facebook.presto.bytecode.instruction.LabelNode in project presto by prestodb.

the class NullIfCodeGenerator method generateExpression.

@Override
public BytecodeNode generateExpression(Signature signature, BytecodeGeneratorContext generatorContext, Type returnType, List<RowExpression> arguments) {
    Scope scope = generatorContext.getScope();
    RowExpression first = arguments.get(0);
    RowExpression second = arguments.get(1);
    LabelNode notMatch = new LabelNode("notMatch");
    // push first arg on the stack
    BytecodeBlock block = new BytecodeBlock().comment("check if first arg is null").append(generatorContext.generate(first)).append(BytecodeUtils.ifWasNullPopAndGoto(scope, notMatch, void.class));
    Type firstType = first.getType();
    Type secondType = second.getType();
    // if (equal(cast(first as <common type>), cast(second as <common type>))
    Signature equalsSignature = generatorContext.getRegistry().resolveOperator(OperatorType.EQUAL, ImmutableList.of(firstType, secondType));
    ScalarFunctionImplementation equalsFunction = generatorContext.getRegistry().getScalarFunctionImplementation(equalsSignature);
    BytecodeNode equalsCall = generatorContext.generateCall(equalsSignature.getName(), equalsFunction, ImmutableList.of(cast(generatorContext, new BytecodeBlock().dup(firstType.getJavaType()), firstType, equalsSignature.getArgumentTypes().get(0)), cast(generatorContext, generatorContext.generate(second), secondType, equalsSignature.getArgumentTypes().get(1))));
    BytecodeBlock conditionBlock = new BytecodeBlock().append(equalsCall).append(BytecodeUtils.ifWasNullClearPopAndGoto(scope, notMatch, void.class, boolean.class));
    // if first and second are equal, return null
    BytecodeBlock trueBlock = new BytecodeBlock().append(generatorContext.wasNull().set(constantTrue())).pop(first.getType().getJavaType()).pushJavaDefault(first.getType().getJavaType());
    // else return first (which is still on the stack
    block.append(new IfStatement().condition(conditionBlock).ifTrue(trueBlock).ifFalse(notMatch));
    return block;
}

Example 4 with LabelNode

use of com.facebook.presto.bytecode.instruction.LabelNode 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 5 with LabelNode

use of com.facebook.presto.bytecode.instruction.LabelNode 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();
}