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  1. JDK
  2. JDK-8218650

missing LineNumberTable records for method invocations with arguments

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    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: tbd
    • Component/s: tools
    • Labels:

      Description

      ===
        1 abstract class T {
        2 class I {
        3 boolean x;
        4 }
        5
        6 static boolean id(boolean x) {
        7 return x;
        8 }
        9
       10 public static void main(String[] args) {
       11 I i = null;
       12 System.err.println(true
       13 && id(i.x));
       14 }
       15 }
      ===

      The null pointer exception in the following program occurs on line 13 with the evaluation of `i.x` (`i` is null), but the stack track reports it as having occurred on 12.

      It looks like the LNT doesn't have a record of the select expression `i.x`.

      $ javac -fullversion
      javac full version "12-ea+30"
      $ javac T.java
      $ javap -v -p T
      ...
        public static void main(java.lang.String[]);
          descriptor: ([Ljava/lang/String;)V
          flags: (0x0009) ACC_PUBLIC, ACC_STATIC
          Code:
            stack=2, locals=2, args_size=1
               0: aconst_null
               1: astore_1
               2: getstatic #2 // Field java/lang/System.err:Ljava/io/PrintStream;
               5: aload_1
               6: getfield #3 // Field T$I.x:Z
               9: invokestatic #4 // Method id:(Z)Z
              12: invokevirtual #5 // Method java/io/PrintStream.println:(Z)V
              15: return
            LineNumberTable:
              line 11: 0
              line 12: 2
              line 13: 9
              line 12: 12
              line 14: 15
      $ java T
      $ java T
      Exception in thread "main" java.lang.NullPointerException
      at T.main(T.java:12)

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            Assignee:
            vromero Vicente Arturo Romero Zaldivar
            Reporter:
            cushon Liam Miller-Cushon
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              Dates

              Created:
              Updated: