llvm_DFGPass

llvm Data Flow Graph Analysis

This is a dynamic LLVM Pass which is to give the basicblocks id and profile the ids.

Build the pass by doing that:

• go to project folder by cd yourdirectory/DFGPass
• you can build the pass by

export LLVM_DIR=<installation/dir/of/llvm/13>
mkdir build
cd build
cmake -DLT_LLVM_INSTALL_DIR=$LLVM_DIR <source/dir/llvm/DFGPass>
make

execute by the Pass

• go to test folder bycd ../test
• you can transform test.c to test.ll byclang-13 -O0 -S -emit-llvm test.c -o test.ll
• now we can analyse it by plungin opt-13 -load-pass-plugin ~/桌面/C_DFG/CFG_DFG_generator/LLVM_Pass/llvm_DFGPass/build/libDFGPass.so -passes=DFGPass -disable-output test.ll
• for every function of your test.c, you'll get a .dot file
• now you can change the dot to png bydot -Tpng main.dot -o main.png

then there are the outputs.