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[Bug translator/20672] @defined(@cast()) regression


https://sourceware.org/bugzilla/show_bug.cgi?id=20672

Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |penguin-kernel@i-love.sakur
                   |                            |a.ne.jp

--- Comment #4 from Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> ---
Hello.

This commit is causing a regression (presumably infinite loop)
with python probes.

---------- /tmp/test.py start ----------
def func1(a, b):
  return a + b;

print(func1(1, 2));
---------- /tmp/test.py end ----------

# time PYTHONPATH=/tmp /usr/bin/stap -e 'probe
python2.module("test").function("*") { printf("%s %s\n", pn(), $$parms); }' -c
'python -m HelperSDT /tmp/test.py'



Bisect log:

# bad: [e81970274b46cf3e20586751bf58195258f31518] Add timestamp to
nfsd-trace.stp example.
# good: [9f950728d1a921e32d53cc8dabcbc0684d0256ee] Update lookup_bad_addr() to
avoid a kernel warning.
git bisect start 'HEAD' '9f950728d1a921e32d53cc8dabcbc0684d0256ee'
# good: [4fb0437d6e19bc5b7c917af5f542938d68968828] testsuite: more adaptation
to $var -> @entry($var) in .return probes
git bisect good 4fb0437d6e19bc5b7c917af5f542938d68968828
# bad: [16aa72d9adf420e973cfb3370f4cb9dacd3922fd] PR20627: rework several code
rewriting passes
git bisect bad 16aa72d9adf420e973cfb3370f4cb9dacd3922fd
# good: [15528f73d31f4fdd5257016957ac2e4cfaac8cd0] testsuite: tweak bz1027459
git bisect good 15528f73d31f4fdd5257016957ac2e4cfaac8cd0
# first bad commit: [16aa72d9adf420e973cfb3370f4cb9dacd3922fd] PR20627: rework
several code rewriting passes

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