ABCL on jailbroken iPhone

[Vibhu Mohindra]

My jailbroken iPhone has GNU classpath[0] and jamvm[1] installed.

To get ABCL working with GNU classpath, I needed to patch two of 
classpath's classes as below.

I patched and built classpath in a Linux VM, then extracted the two 
class files from the resulting glibj.zip and inserted them into the 
iPhone's /usr/share/classpath/glibj.zip .

I've reported these modifications to:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67188
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67189
the latter of which may be an ABCL problem, not a GNU classpath one.

(Performance: The ABCL REPL takes a few minutes to appear, but things 
look good when it does.)

ref:
[0] http://www.gnu.org/software/classpath/
[1] http://jamvm.sourceforge.net/

Vibhu


diff -Naur classpath-0.99/java/math/BigInteger.java 
classpath-0.99.abcl/java/math/BigInteger.java
--- classpath-0.99/java/math/BigInteger.java    2010-09-02 
17:47:07.000000000 +0100
+++ classpath-0.99.abcl/java/math/BigInteger.java    2015-08-11 
02:01:18.000000000 +0100
@@ -183,6 +183,7 @@
      int i, digit;
      boolean negative;
      byte[] bytes;
+    if (len == 0) throw new NumberFormatException("zero length big 
integer");
      char ch = s.charAt(0);
      if (ch == '-')
        {
diff -Naur classpath-0.99/java/nio/charset/CharsetEncoder.java 
classpath-0.99.abcl/java/nio/charset/CharsetEncoder.java
--- classpath-0.99/java/nio/charset/CharsetEncoder.java  2010-06-03 
20:13:04.000000000 +0100
+++ classpath-0.99.abcl/java/nio/charset/CharsetEncoder.java  2015-08-12 
12:16:13.000000000 +0100
@@ -159,8 +159,6 @@
      // in progress" and also that "it resets this Encoder".
      // Should we check to see that the state is reset, or should we
      // call reset()?
-    if (state != STATE_RESET)
-      throw new IllegalStateException ();

      // REVIEW: Using max instead of average may allocate a very large
      // buffer.  Maybe we should do something more efficient?
@@ -199,9 +197,6 @@
      // a return value indicating an incomplete decoding operation"
      // XXX: We will not check the previous return value, just
      // that the previous call passed true for endOfInput
-    if (state != STATE_RESET && state != STATE_CODING
-        && !(endOfInput && state == STATE_END))
-      throw new IllegalStateException ();
      state = newState;

      for (;;)