I don't know why. I followed the instructions in the readme. But when finally I use th

pass has no effect about llvm-pass-skeleton HOT 1 CLOSED

sampsyo commented on July 22, 2024

pass has no effect

from llvm-pass-skeleton.

Comments (1)

LuoRongLuoRong commented on July 22, 2024

I found the problem. I didn't follow your instruction completely.
I changed /skeleton/CMakefile.txt. The line target_compile_features(SkeletonPass PRIVATE cxx_range_for cxx_auto_type) should not be omitted.
Then I run commands as follows:

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/build$ cmake ..
-- Configuring done
-- Generating done
-- Build files have been written to: /home/fdse/luorong/LLVM/test/llvm-pass-skeleton/build

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/build$ make
Consolidate compiler generated dependencies of target SkeletonPass
[ 50%] Building CXX object skeleton/CMakeFiles/SkeletonPass.dir/Skeleton.cpp.o
[100%] Linking CXX shared module libSkeletonPass.so
[100%] Built target SkeletonPass

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/build$ cd skeleton/

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/build/skeleton$ ls
CMakeFiles  cmake_install.cmake  libSkeletonPass.so  Makefile
(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/build/skeleton$ opt -load ./libSkeletonPass.so -help | grep skeleton
      --skeleton                                                           - a useless pass

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/build/skeleton$ cd ../../src

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/src$ clang++ -O0 -g -S -emit-llvm demo.cpp -o demo.ll

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/src$ ls
demo.cpp  demo.ll

(base) fdse@ubuntu:~/luorong/LLVM/test/llvm-pass-skeleton/src$ opt -load ../build/skeleton/libSkeletonPass.so -skeleton demo.ll -enable-new-pm=0
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

I saw a function called _Z5func2v!
I saw a function called _Z4funcv!
I saw a function called main!