[Bug java/19277] New: allows array.length++ although it is final

kon at iki dot fi gcc-bugzilla@gcc.gnu.org
Wed Jan 5 19:50:00 GMT 2005

GCC checked out on 2005-01-03 compiles the following code without
complaint, using the command line "gcj -C -Wall -W -pedantic

class ArrayLength {
    static int extend(int[] array) {
        /* array.length = 1; */
        return array.length;

It generates the following bytecode for the method:

  0: aload_0
  1: dup
  2: getfield <Field [I.length int>
  5: iconst_1
  6: iadd
  7: putfield <Field [I.length int>
 10: aload_0
 11: arraylength
 12: ireturn

However, if I uncomment the first assignment, I get this error:

ArrayLength.java: In class 'ArrayLength':
ArrayLength.java: In method 'ArrayLength.extend(int[])':
ArrayLength.java:3: error: Can't reassign a value to the final variable 'length'.
        array.length = 1;
1 error

I think it is inconsistent to allow ++ if the field is final.

           Summary: allows array.length++ although it is final
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kon at iki dot fi
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org
 GCC build triplet: i386-pc-linux-gnu
  GCC host triplet: i386-pc-linux-gnu
GCC target triplet: i386-pc-linux-gnu


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