Mark obfuscated functions are no-opt accordingly

Question

Mark obfuscated functions are no-opt accordingly

Closed this issue 7 years ago · 6 comments

Currently globally we rely on the user is not naive enough to pass -O3 so the aggressive DCE won't kick in. This can be fixed by adding attributes to the functions we are obfuscating instead. Similar to what we did in lib/Transforms/Obfuscation/AntiDebugging.cpp

Answer 1 · 2018-01-18T07:49:44.000Z

ScaffCC use -Xclang -disable-O0-optnone -S -emit-llvm, then use opt -PASS and opt -load ScaffCC-Library -PASS separately.

Answer 2 · 2018-01-18T07:53:11.000Z

True. However Xcode and similar IDEs don't provide options like this without explicitly introducing loads of scripts. So it's probably best we make it seamlessly

Answer 3 · 2018-01-18T07:55:06.000Z

Is Xcode open source? hack Xcode :)

Answer 4 · 2018-01-18T07:56:14.000Z

Nope. Further than that even the llvm used in Xcode is not open-source, unless you consider source from almost two years ago open

Answer 5 · 2018-02-03T14:50:19.000Z

Seems like various backends still takes opt-level and ignore function attribute in some cases.
Let's not attempt to fix issues raised by idiotic programmers

Answer 6 · 2018-02-04T01:20:24.000Z

I experienced that http://lists.llvm.org/pipermail/llvm-dev/2017-October/118419.html