callgraph_generator

Dependencies:

<<<<<<< HEAD for this project, I am using latest version of LLVM (15)

for this project, I am using LLVM 15 for the project.

cba5587 (stack-depth and callgraph for direct calls generated)

LLVM build process

cd llvm-project && mkdir build

cmake -DLLVM_TARGET_ARCH="X86" \ -DLLVM_TARGETS_TO_BUILD="ARM;X86;AArch64" \ -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly \ -DCMAKE_BUILD_TYPE=Release \ -DLLVM_ENABLE_PROJECTS="clang;lldb;lld" \ -G "Unix Makefiles" \ ../llvm

make

mkdir ../prefix

cmake -DCMAKE_INSTALL_PREFIX=../prefix -P cmake_install.cmake

Generating Call Graph from bitcode file generated

• created the CMake and MakeFile by using TyPM repo as reference
• Checkout the MakeFile to see how to run the callgraph
  • Once I resolve all the issue I will document that as well.

Documenting the decisions along the way

• chose ThinLTO

  • should check the effects of NO-LTO and FULL LTO

• Currently doing static analysis on defconfig

  • Roop go insane stack depth when did static analysis with allyesconfig without indirectcall and loops
  • the stack depth greatly depends on the config file that the kernel uses

• TODO

  • Explains how cgenerator code works