ci(fuzzer): build the Rust runtime in CI

Teach release and test workflows about the Rust-backed backend so the native addon is built, cached, and exercised the way it is shipped.

Author: oetr

.github/workflows/release.yaml

@@ -28,6 +28,11 @@ jobs:
         with:
           node-version: 22
           cache: "npm"
+      - name: rust
+        uses: dtolnay/rust-toolchain@stable
+      - name: rust target (macos x64)
+        if: ${{ matrix.os == 'macos-latest' && matrix.arch == '--arch x86_64' }}
+        run: rustup target add x86_64-apple-darwin
       - name: MSVC (windows)
         uses: ilammy/msvc-dev-cmd@v1
         if: contains(matrix.os, 'windows')

.github/workflows/run-all-tests-main.yaml

@@ -21,18 +21,25 @@ jobs:
           path: |
             packages/fuzzer/prebuilds
           key:
-            fuzzer-cache-${{ runner.os }}-${{
-            hashFiles('packages/fuzzer/CMakeLists.txt',
-            'packages/fuzzer/**/*.h', 'packages/fuzzer/**/*.cpp') }}
+            fuzzer-cache-${{ runner.os }}-${{ hashFiles('package-lock.json',
+            'package.json', 'packages/fuzzer/package.json',
+            'packages/fuzzer/CMakeLists.txt', 'packages/fuzzer/**/*.h',
+            'packages/fuzzer/**/*.cpp', 'packages/fuzzer/rust/Cargo.toml',
+            'packages/fuzzer/rust/Cargo.lock',
+            'packages/fuzzer/rust/src/**/*.rs') }}
       - name: node
         uses: actions/setup-node@v6
         with:
           node-version: 22
           cache: "npm"
+      - name: rust
+        uses: dtolnay/rust-toolchain@stable
       - name: install dependencies
         run: npm ci
       - name: build project
         run: npm run build
+      - name: test LibAFL runtime
+        run: cargo test --manifest-path packages/fuzzer/rust/Cargo.toml
       - name: build fuzzer
         if: ${{ steps.cache-fuzzer.outputs.cache-hit != 'true' }}
         run: npm run build --workspace=@jazzer.js/fuzzer

.github/workflows/run-all-tests-pr.yaml

@@ -24,13 +24,17 @@ jobs:
         with:
           node-version: 22
           cache: "npm"
+      - name: rust
+        uses: dtolnay/rust-toolchain@stable
       - name: install dependencies
         run: npm ci
       - name: install clang-tidy
         run: sudo apt-get install -y clang-tidy
       - name: build project
         # Build project so that imports can be checked during linting
         run: npm run build
+      - name: test LibAFL runtime
+        run: cargo test --manifest-path packages/fuzzer/rust/Cargo.toml
       - name: build fuzzer
         # Build the native addon so that CMake downloads libFuzzer and
         # generates compile_commands.json, which are needed by clang-tidy
@@ -59,14 +63,19 @@ jobs:
           path: |
             packages/fuzzer/prebuilds
           key:
-            fuzzer-cache-${{ matrix.os }}-${{
-            hashFiles('packages/fuzzer/CMakeLists.txt',
-            'packages/fuzzer/**/*.h', 'packages/fuzzer/**/*.cpp') }}
+            fuzzer-cache-${{ matrix.os }}-${{ hashFiles('package-lock.json',
+            'package.json', 'packages/fuzzer/package.json',
+            'packages/fuzzer/CMakeLists.txt', 'packages/fuzzer/**/*.h',
+            'packages/fuzzer/**/*.cpp', 'packages/fuzzer/rust/Cargo.toml',
+            'packages/fuzzer/rust/Cargo.lock',
+            'packages/fuzzer/rust/src/**/*.rs') }}
       - name: node
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node }}
           cache: "npm"
+      - name: rust
+        uses: dtolnay/rust-toolchain@stable
       - name: MSVC (windows)
         uses: ilammy/msvc-dev-cmd@v1
         if: contains(matrix.os, 'windows')
@@ -95,6 +104,8 @@ jobs:
         with:
           node-version: 22
           cache: "npm"
+      - name: rust
+        uses: dtolnay/rust-toolchain@stable
       - name: MSVC (windows)
         uses: ilammy/msvc-dev-cmd@v1
         if: contains(matrix.os, 'windows')