Patch for IcedTea7-2.1 on ARM 32bit (mixed mode) TCK method handle invoke failures

[Andrew Dinn]

Attached is a patch for IcedTea7-2.1 which fixes some observed TCK
failures associated with dynamic method handle invocation. The attached
reproducer tests manifest the problems -- Test1 and Test2 fail with a
SEGV, Test3 fails with a call to ShouldNotReachHere.

The first two tests fail with a SEGV because because the unbox method
handle adapter code fails to check for a null argument. The fix traps
this case and throws a NullPointerException to the caller of
MethodHandle.invoke.

The third test fails because the retype method handle adapter code
allows for widening of results from BOOLEAN, BYTE, CHAR and SHORT to INT
but does not allow narrowing from INT to a shorter integral type.
However, execution of Test3 results in generation of retype method
handle adapters which attempt narrowing from INT to BYTE. The fix makes
the adapter code more permissive so that these narrowing returns are
allowed.

The patch has been applied to the IcedTea7-2.1 tree and found to fix all
three tests. Comments welcome.

regards,


Andrew Dinn
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