Package org.jacoco.core.internal.analysis.filter

Class KotlinSafeCallOperatorFilter

  • All Implemented Interfaces:
    IFilter
    final class KotlinSafeCallOperatorFilter
extends java.lang.Object
implements IFilter
    Filters bytecode that Kotlin compiler generates for chains of safe call operators (?.).

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void filter​(org.objectweb.asm.tree.MethodNode methodNode, IFilterContext context, IFilterOutput output)
      This method is called for every method.
      private static java.util.Collection<java.util.ArrayList<org.objectweb.asm.tree.JumpInsnNode>> findChains​(org.objectweb.asm.tree.MethodNode methodNode)
      "optimized" chain:
      private static boolean isUnoptimizedSafeCallFollowedByElvis​(org.objectweb.asm.tree.JumpInsnNode jump, org.objectweb.asm.tree.AbstractInsnNode target, java.util.ArrayList<org.objectweb.asm.tree.JumpInsnNode> chain)  
      private static org.objectweb.asm.tree.AbstractInsnNode preceding​(org.objectweb.asm.tree.AbstractInsnNode i, int opcode)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • KotlinSafeCallOperatorFilter

        KotlinSafeCallOperatorFilter()

    • Method Detail

      • 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

      • findChains

        private static java.util.Collection<java.util.ArrayList<org.objectweb.asm.tree.JumpInsnNode>> findChains​(org.objectweb.asm.tree.MethodNode methodNode)
        "optimized" chain: 
         DUP
 IFNULL label
 ... // call 0

 ...

 DUP
 IFNULL label
 ... // call N

 label:
 POP
        "unoptimized" chain: 
         ALOAD v0
 IFNULL label
 ... // call 0

 ...

 ASTORE v1
 ALOAD v1
 IFNULL label
 ... // call N

 label:
 ACONST_NULL
        "unoptimized" safe call operator(s) followed by elvis operator: 
         ALOAD v0
 IFNULL nullCase
 ... // call 0

 ASTORE v1
 ALOAD v1
 IFNULL nullCase
 ... // call 1

 ...

 ASTORE vN
 ALOAD vN
 IFNULL nullCase
 ALOAD vN
 GOTO nonNullCase
 nullCase:
 ... // right hand side of elvis operator
 nonNullCase:
 ...

      • isUnoptimizedSafeCallFollowedByElvis

        private static boolean isUnoptimizedSafeCallFollowedByElvis​(org.objectweb.asm.tree.JumpInsnNode jump,
                                                            org.objectweb.asm.tree.AbstractInsnNode target,
                                                            java.util.ArrayList<org.objectweb.asm.tree.JumpInsnNode> chain)

      • preceding

        private static org.objectweb.asm.tree.AbstractInsnNode preceding​(org.objectweb.asm.tree.AbstractInsnNode i,
                                                                 int opcode)
        Returns:
        non pseudo-instruction preceding given if it has given opcode, null otherwise