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.
  • 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