Aztec Connect Cpp: C++ codebase that uses Barretenberg for Aztec Connect rollup circuits

This code is highly experimental, use at your own risk!

Dependencies

• cmake >= 3.16
• clang >= 10 or gcc >= 10
• clang-format
• libomp (if multithreading is required. Multithreading can be disabled using the compiler flag -DMULTITHREADING 0)

Installing openMP (Linux)

RUN git clone -b release/10.x --depth 1 https://github.com/llvm/llvm-project.git \
  && cd llvm-project && mkdir build-openmp && cd build-openmp \
  && cmake ../openmp -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLIBOMP_ENABLE_SHARED=OFF \
  && cmake --build . --parallel \
  && cmake --build . --parallel --target install \
  && cd ../.. && rm -rf llvm-project

Getting started

Run the bootstrap script. (The bootstrap script will build both the native and wasm versions of aztec-connect-cpp)

./bootstrap.sh rollup_cli db_cli tx_factory keygen

Formatting

Code is formatted using clang-format and the ./format.sh script which is called via a git pre-commit hook. If you've installed the C++ Vscode extension you should configure it to format on save.

Testing

Each module has its own tests. e.g. To build and run rollup_proofs_account tests:

cmake --build . --parallel --target rollup_proofs_account_tests
./bin/rollup_proofs_account_tests

A shorthand for the above is:

cmake --build . --parallel --target run_rollup_proofs_account_tests

Running the entire suite of tests using ctest:

cmake --build . --parallel --target test

You can run specific tests, e.g.

./bin/rollup_proofs_account_tests --gtest_filter=client_proofs_account_tx.*

CMake Build Options

CMake can be passed various build options on it's command line:

• -DCMAKE_BUILD_TYPE=Debug | Release | RelWithAssert: Build types.
• -DDISABLE_ASM=ON | OFF: Enable/disable x86 assembly.
• -DDISABLE_ADX=ON | OFF: Enable/disable ADX assembly instructions (for older cpu support).
• -DMULTITHREADING=ON | OFF: Enable/disable multithreading using OpenMP.
• -DTESTING=ON | OFF: Enable/disable building of tests.
• -DTOOLCHAIN=<filename in ./cmake/toolchains>: Use one of the preconfigured toolchains.

WASM build

To build:

mkdir build-wasm && cd build-wasm
cmake -DTOOLCHAIN=wasm-linux-clang ..
cmake --build . --parallel --target aztec-connect.wasm

The resulting wasm binary will be at ./src/aztec/aztec-connect.wasm.

To run the tests, you'll need to install wasmtime.

curl https://wasmtime.dev/install.sh -sSf | bash

Tests can be built and run like:

cmake --build . --parallel --target rollup_proofs_account_tests
wasmtime --dir=.. ./bin/rollup_proofs_account_tests

To turn on address sanitizer add -DADDRESS_SANITIZER=ON. Note that address sanitizer can be used to explore crashes. Sometimes you might have to specify the address of llvm-symbolizer. You have to do it with export ASAN_SYMBOLIZER_PATH=<PATH_TO_SYMBOLIZER>. For undefined behaviour sanitizer -DUNDEFINED_BEHAVIOUR_SANITIZER=ON. Note that the fuzzer can be orders of magnitude slower with ASan (2-3x slower) or UBSan on, so it is best to run a non-sanitized build first, minimize the testcase and then run it for a bit of time with sanitizers.