A discussion from the ProGuard's forum:
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We have a question on the ProGuard's "dontoptimize" option.
According to the ProGuard's doc's description,
"-dontoptimize
Specifies not to optimize the input class files.
By default, optimization is enabled; all methods are optimized at a
bytecode level. "
Our understanding is that by default when the optimization option is
on, all methods are optimized utilizing some specific properties of
conventional JVM.
Our questions are,
1. What properties of the conventional JVM are exploited?
2. How to optimze the bytecode aligned with those properties?
The reason that we ask those questions is that, when we obfuscate Java
bytecode, then convert it into Google/Android dex file, exceptions are
thrown, saying some convertion doesn't work properly.
However, after we put on the "dontoptimze" option, the convertion
works fine.
Very curious what happens under the surface.
RE: A question on the "dontoptimize" option. (New)
By: Eric Lafortune (lafortuneProject Admin) - 2008-07-09 01:16
The optimizations are listed in the ProGuard FAQ, question #4.
There are many different types of optimizations, but the output should
always be valid bytecode. If the code works in a JVM, but not with
Android, it's most likely a bug in the Android tool. If the code also
fails in a JVM, you should provide some more details, so I can
investigate.
Eric.
====================================
What do you think about Eric's " If the code works in a JVM, but not
with Android, it's most likely a bug in the Android tool"?? The
android tool here should be dx tool.
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