Class KotlinDefaultArgumentsFilter

java.lang.Object

org.jacoco.core.internal.analysis.filter.KotlinDefaultArgumentsFilter

All Implemented Interfaces:

IFilter

public final class KotlinDefaultArgumentsFilter
extends Object
implements IFilter

Filters branches that Kotlin compiler generates for default arguments. For methods and constructors with default arguments Kotlin compiler generates synthetic method with suffix "$default" or a synthetic constructor with last argument "kotlin.jvm.internal.DefaultConstructorMarker" respectively. And in this synthetic method for each default argument Kotlin compiler generates following bytecode to determine if it should be used or not:

ILOAD maskVar
ICONST_x, BIPUSH, SIPUSH, LDC or LDC_W
IAND
IFEQ label
default argument
label:

If original method has X arguments, then in synthetic method maskVar is one of arguments from X+1 to X+1+(X/32). At least one of such arguments is not zero - invocation without default arguments uses original non synthetic method. This filter marks IFEQ instructions as ignored.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	KotlinDefaultArgumentsFilter.Matcher

Constructor Summary

Constructors

Constructor	Description
KotlinDefaultArgumentsFilter()

Method Summary

Modifier and Type	Method	Description
(package private) static int	computeNumberOfMaskArguments(int arguments)
void	filter(org.objectweb.asm.tree.MethodNode methodNode, IFilterContext context, IFilterOutput output)	This method is called for every method.
(package private) static boolean	isDefaultArgumentsConstructor(org.objectweb.asm.tree.MethodNode methodNode)
(package private) static boolean	isDefaultArgumentsMethod(org.objectweb.asm.tree.MethodNode methodNode)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

KotlinDefaultArgumentsFilter

public KotlinDefaultArgumentsFilter()

Method Details

isDefaultArgumentsMethod

static boolean isDefaultArgumentsMethod(org.objectweb.asm.tree.MethodNode methodNode)

isDefaultArgumentsConstructor

static boolean isDefaultArgumentsConstructor(org.objectweb.asm.tree.MethodNode methodNode)

filter

public void filter(org.objectweb.asm.tree.MethodNode methodNode,
 IFilterContext context,
 IFilterOutput output)

Description copied from interface: IFilter

This method is called for every method. The filter implementation is expected to inspect the provided method and report its result to the given IFilterOutput instance.

Specified by:

filter in interface IFilter

Parameters:

methodNode - method to inspect

context - context information for the method

output - callback to report filtering results to

computeNumberOfMaskArguments

static int computeNumberOfMaskArguments(int arguments)

Parameters:

arguments - number of arguments of synthetic method

Returns:

number of arguments holding mask