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CS639

This repository maintains our code for the course CS639A (Program Analysis and Verification) at IIT Kanpur in the Fall of 2020. For a detailed discussion, please refer to this file.

Setup

We use docker to setup the necessary toolchain. To setup the container, clone this repo and cd into it:

$ docker build . -t smack_em
$ docker run -v `pwd`:/host -it smack_em

Once inside the container, the first thing to do is to setup some environment variables and config files.

$ cd /root/emsdk/upstream/emscripten
$ ./em-config

This should place a file called .emscripten in /root. We need to update some paths in that file:

EMSCRIPTEN_ROOT="/root/emsdk/upstream/emscripten"
LLVM_ROOT="/root/emsdk/upstream/bin"
BINARYEN_ROOT="/root/emsdk/upstream/bin"

Next, ensure that the environment varibale EM_CONFIG is set to /root/.emscripten (if not set it).

Compilation

To compile a C/C++ source (that uses emsdk) to LLVM IR and then to boogie:

$ clang++ `em++ --cflags` -emit-llvm -S <filename>.cpp -o <filename>.ll
$ smack --no-verify --clang-options="`em++ --cflags`" -bpl <filename>.bpl <filename>.ll

Running some files might need additional include paths, add them like

--clang-options="`emcc --cflags` -I<include/path>"

Angelic Verifier

To run AV on any file, first compile it to boogie as above. Then:

bash <scripts_folder>/prepHarness.sh <file_name>.bpl
mono `which AvHarnessInstrumentation.exe` <file_name>.bpl <file_name>.harness.bpl
mono `which AngelicVerifierNull.exe` <file_name>.harness.bpl

Running Benchmarks

For cleanliness purposes, it is recommneded to copy an individual benchmark to a separate folder before running experiments. We already provide compiled boogie (.bpl) files. If you need compilation instructions, some boogie files will indicate them at the start of the file. For those that do not, feel free to contact yugeshk or baldip or try figuring it out yourself.

Vanilla Corral

Use the .bpl file provided in folders baseline_corral

corral /cex:10 /tryCTrace <file_name>.bpl

Corral with stubs

Use the .bpl file provided in folders corral_with_stubs. Some folders will contain a file harness.bpl, use that instead of the default filename.

corral /cex:10 /tryCTrace <file_name>.bpl

AV

Use the .av.bpl file provided in folders av.

mono `which AngelicVerifierNull.exe` <file_name>.av.bpl /copt:tryCTrace