ayersdecker · ayersdecker · Jun 20, 2026 · Jun 20, 2026 · Jun 20, 2026
diff --git a/.github/workflows/codegen-tests.yml b/.github/workflows/codegen-tests.yml
@@ -9,13 +9,17 @@ on:
       - 'tools/codegen/**'
       - 'src/Framework/**'
       - 'src/Framework.Tests/**'
+      - 'native/test_stub/**'
+      - 'native/dsp_fixture/**'
       - '.github/workflows/codegen-tests.yml'
       - 'Directory.Build.props'
   pull_request:
     paths:
       - 'tools/codegen/**'
       - 'src/Framework/**'
       - 'src/Framework.Tests/**'
+      - 'native/test_stub/**'
+      - 'native/dsp_fixture/**'
       - '.github/workflows/codegen-tests.yml'
       - 'Directory.Build.props'
 
@@ -81,7 +85,7 @@ jobs:
       - name: Build codegen
         run: FerrumSkipMobile=true dotnet build tools/codegen/Ferrum.Codegen.csproj -c Release
 
-      - name: Run codegen on test stub header
+      - name: Run codegen on test stub header (ferrum_add)
         run: |
           FerrumSkipMobile=true dotnet run --project tools/codegen/Ferrum.Codegen.csproj \
             --configuration Release \
@@ -92,11 +96,32 @@ jobs:
             --class  AddBindings \
             --lib    __Internal
 
-      - name: Verify output
+      - name: Verify add.h output
         run: |
-          echo "=== Generated bindings ==="
+          echo "=== Generated bindings (add.h) ==="
           cat /tmp/AddBindings.cs
-          # Ensure [LibraryImport] and the function name are present
           grep -q "\[LibraryImport" /tmp/AddBindings.cs
           grep -q "ferrum_add"      /tmp/AddBindings.cs
-          echo "==> Smoke test passed"
+          echo "==> add.h smoke test passed"
+
+      - name: Run codegen on DSP fixture header (ferrum_dsp)
+        run: |
+          FerrumSkipMobile=true dotnet run --project tools/codegen/Ferrum.Codegen.csproj \
+            --configuration Release \
+            -- \
+            --input  native/dsp_fixture/include/ferrum_dsp.h \
+            --output /tmp/DspBindings.cs \
+            --ns     Ferrum.Generated \
+            --class  DspBindings \
+            --lib    __Internal
+
+      - name: Verify ferrum_dsp.h output
+        run: |
+          echo "=== Generated bindings (ferrum_dsp.h) ==="
+          cat /tmp/DspBindings.cs
+          grep -q "\[LibraryImport"      /tmp/DspBindings.cs
+          grep -q "ferrum_dsp_scale"     /tmp/DspBindings.cs
+          grep -q "ferrum_dsp_stats"     /tmp/DspBindings.cs
+          grep -q "FerrumDspStats"       /tmp/DspBindings.cs
+          grep -q "StructLayout"         /tmp/DspBindings.cs
+          echo "==> ferrum_dsp.h smoke test passed"
diff --git a/.github/workflows/native-build.yml b/.github/workflows/native-build.yml
@@ -22,20 +22,37 @@ permissions:
 jobs:
   # ── iOS XCFramework ────────────────────────────────────────────────────────
   ios:
-    name: iOS XCFramework (${{ matrix.platform }})
+    name: iOS XCFramework (${{ matrix.platform }}, ${{ matrix.target }})
     runs-on: macos-15
     strategy:
       matrix:
         include:
+          # test_stub slices
           - platform: OS64
             sysroot: iphoneos
             label: device-arm64
+            target: ferrum_test_stub
           - platform: SIMULATORARM64
             sysroot: iphonesimulator
             label: sim-arm64
+            target: ferrum_test_stub
           - platform: SIMULATOR64
             sysroot: iphonesimulator
             label: sim-x86_64
+            target: ferrum_test_stub
+          # dsp_fixture slices
+          - platform: OS64
+            sysroot: iphoneos
+            label: dsp-device-arm64
+            target: ferrum_dsp_fixture
+          - platform: SIMULATORARM64
+            sysroot: iphonesimulator
+            label: dsp-sim-arm64
+            target: ferrum_dsp_fixture
+          - platform: SIMULATOR64
+            sysroot: iphonesimulator
+            label: dsp-sim-x86_64
+            target: ferrum_dsp_fixture
 
     steps:
       - uses: actions/checkout@v4
@@ -57,65 +74,78 @@ jobs:
         run: |
           cmake --build .build/ios/${{ matrix.label }} \
                 --config Release \
-                --target ferrum_test_stub
+                --target ${{ matrix.target }}
 
       - name: Upload slice artifact
         uses: actions/upload-artifact@v4
         with:
           name: ios-${{ matrix.label }}
-          path: .build/ios/${{ matrix.label }}/Release-${{ matrix.sysroot }}/libferrum_test_stub.a
+          path: .build/ios/${{ matrix.label }}/Release-${{ matrix.sysroot }}/lib${{ matrix.target }}.a
 
-  # Assemble the full XCFramework from the three slices
+  # Assemble the full XCFramework from the three slices (per target)
   ios-xcframework:
-    name: Assemble XCFramework
+    name: Assemble XCFramework (${{ matrix.target }})
     runs-on: macos-15
     needs: ios
+    strategy:
+      matrix:
+        include:
+          - target: ferrum_test_stub
+            device_label: device-arm64
+            sim_arm64_label: sim-arm64
+            sim_x86_label: sim-x86_64
+          - target: ferrum_dsp_fixture
+            device_label: dsp-device-arm64
+            sim_arm64_label: dsp-sim-arm64
+            sim_x86_label: dsp-sim-x86_64
     steps:
       - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v4
         with:
-          name: ios-device-arm64
-          path: .slices/device
+          name: ios-${{ matrix.device_label }}
+          path: .slices/${{ matrix.target }}/device
 
       - uses: actions/download-artifact@v4
         with:
-          name: ios-sim-arm64
-          path: .slices/sim-arm64
+          name: ios-${{ matrix.sim_arm64_label }}
+          path: .slices/${{ matrix.target }}/sim-arm64
 
       - uses: actions/download-artifact@v4
         with:
-          name: ios-sim-x86_64
-          path: .slices/sim-x86_64
+          name: ios-${{ matrix.sim_x86_label }}
+          path: .slices/${{ matrix.target }}/sim-x86_64
 
       - name: Create fat simulator library
         run: |
+          mkdir -p .slices/${{ matrix.target }}/sim-fat
           lipo -create \
-            .slices/sim-arm64/libferrum_test_stub.a \
-            .slices/sim-x86_64/libferrum_test_stub.a \
-            -output .slices/sim-fat/libferrum_test_stub.a
+            .slices/${{ matrix.target }}/sim-arm64/lib${{ matrix.target }}.a \
+            .slices/${{ matrix.target }}/sim-x86_64/lib${{ matrix.target }}.a \
+            -output .slices/${{ matrix.target }}/sim-fat/lib${{ matrix.target }}.a
 
       - name: Create XCFramework
         run: |
           mkdir -p artifacts/ios
           xcodebuild -create-xcframework \
-            -library .slices/device/libferrum_test_stub.a \
-            -library .slices/sim-fat/libferrum_test_stub.a \
-            -output artifacts/ios/libferrum_test_stub.xcframework
+            -library .slices/${{ matrix.target }}/device/lib${{ matrix.target }}.a \
+            -library .slices/${{ matrix.target }}/sim-fat/lib${{ matrix.target }}.a \
+            -output artifacts/ios/lib${{ matrix.target }}.xcframework
 
       - name: Upload XCFramework
         uses: actions/upload-artifact@v4
         with:
-          name: ios-xcframework
-          path: artifacts/ios/libferrum_test_stub.xcframework
+          name: ios-xcframework-${{ matrix.target }}
+          path: artifacts/ios/lib${{ matrix.target }}.xcframework
 
   # ── Android .so per ABI ────────────────────────────────────────────────────
   android:
-    name: Android (${{ matrix.abi }})
+    name: Android (${{ matrix.abi }}, ${{ matrix.target }})
     runs-on: ubuntu-24.04
     strategy:
       matrix:
         abi: [arm64-v8a, armeabi-v7a, x86_64, x86]
+        target: [ferrum_test_stub, ferrum_dsp_fixture]
 
     steps:
       - uses: actions/checkout@v4
@@ -130,20 +160,20 @@ jobs:
         run: |
           NDK_ROOT="${ANDROID_SDK_ROOT}/ndk/27.2.12479018"
           cmake -S native \
-                -B .build/android/${{ matrix.abi }} \
+                -B .build/android/${{ matrix.abi }}-${{ matrix.target }} \
                 -DCMAKE_TOOLCHAIN_FILE="${NDK_ROOT}/build/cmake/android.toolchain.cmake" \
                 -DANDROID_ABI=${{ matrix.abi }} \
                 -DANDROID_PLATFORM=android-24 \
                 -DCMAKE_BUILD_TYPE=Release
 
       - name: Build
         run: |
-          cmake --build .build/android/${{ matrix.abi }} \
+          cmake --build .build/android/${{ matrix.abi }}-${{ matrix.target }} \
                 --config Release \
-                --target ferrum_test_stub
+                --target ${{ matrix.target }}
 
       - name: Upload .so artifact
         uses: actions/upload-artifact@v4
         with:
-          name: android-${{ matrix.abi }}
-          path: .build/android/${{ matrix.abi }}/libferrum_test_stub.so
+          name: android-${{ matrix.abi }}-${{ matrix.target }}
+          path: .build/android/${{ matrix.abi }}-${{ matrix.target }}/lib${{ matrix.target }}.so
diff --git a/Ferrum.sln b/Ferrum.sln
@@ -9,12 +9,16 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tools", "tools", "{A0000002
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "samples", "samples", "{A0000003-0000-0000-0000-000000000003}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "templates", "templates", "{A0000004-0000-0000-0000-000000000004}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ferrum.Framework", "src\Framework\Ferrum.Framework.csproj", "{B1000001-0000-0000-0000-000000000001}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ferrum.Framework.Tests", "src\Framework.Tests\Ferrum.Framework.Tests.csproj", "{B1000002-0000-0000-0000-000000000002}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ferrum.Codegen", "tools\codegen\Ferrum.Codegen.csproj", "{C1000001-0000-0000-0000-000000000001}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ferrum.Templates", "templates\Ferrum.Templates.csproj", "{C1000002-0000-0000-0000-000000000002}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MinimalDemo", "samples\MinimalDemo\MinimalDemo.csproj", "{D1000001-0000-0000-0000-000000000001}"
 EndProject
 Global
@@ -35,6 +39,10 @@ Global
 		{C1000001-0000-0000-0000-000000000001}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{C1000001-0000-0000-0000-000000000001}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{C1000001-0000-0000-0000-000000000001}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C1000002-0000-0000-0000-000000000002}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C1000002-0000-0000-0000-000000000002}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C1000002-0000-0000-0000-000000000002}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C1000002-0000-0000-0000-000000000002}.Release|Any CPU.Build.0 = Release|Any CPU
 		{D1000001-0000-0000-0000-000000000001}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{D1000001-0000-0000-0000-000000000001}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D1000001-0000-0000-0000-000000000001}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -44,6 +52,7 @@ Global
 		{B1000001-0000-0000-0000-000000000001} = {A0000001-0000-0000-0000-000000000001}
 		{B1000002-0000-0000-0000-000000000002} = {A0000001-0000-0000-0000-000000000001}
 		{C1000001-0000-0000-0000-000000000001} = {A0000002-0000-0000-0000-000000000002}
+		{C1000002-0000-0000-0000-000000000002} = {A0000004-0000-0000-0000-000000000004}
 		{D1000001-0000-0000-0000-000000000001} = {A0000003-0000-0000-0000-000000000003}
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution

diff --git a/docs/architecture.md b/docs/architecture.md
@@ -51,10 +51,11 @@ the consuming application provides the native library.
 
 | File / directory | Purpose |
 |---|---|
-| `native/CMakeLists.txt` | Top-level project; includes helpers, optionally builds the test stub |
+| `native/CMakeLists.txt` | Top-level project; includes helpers, optionally builds the test fixtures |
 | `native/cmake/ferrum_helpers.cmake` | `ferrum_add_static_library()` macro that sets common flags |
 | `native/cmake/ios.toolchain.cmake` | Minimal iOS cross-compilation toolchain (no external deps) |
 | `native/test_stub/` | Trivial `ferrum_add(int, int)` C library used to validate the pipeline |
+| `native/dsp_fixture/` | `ferrum_dsp_scale(float*, int32_t, float)` + `ferrum_dsp_stats(const float*, int32_t, FerrumDspStats*)` — validates the float-buffer and struct-out-param patterns |
 | `native/scripts/build_ios.sh` | Builds all three iOS slices and packages them as an XCFramework |
 | `native/scripts/build_android.sh` | Builds `.so` for all four Android ABIs using the NDK toolchain |
 
@@ -135,9 +136,14 @@ definitions.
    (source-generated at build time) instead of `[DllImport]` (which uses
    reflection at runtime). No `MarshalAs` attributes are emitted.
 
-3. **Simple, dependency-free parser.** The parser is a regex/tokenizer
-   approach — not a full C frontend. It handles the subset of C headers
-   needed for P/Invoke: function prototypes and POD structs.
+3. **Simple, dependency-free parser.** The parser is a strict tokenizer —
+   not a full C frontend. It handles the subset of C headers needed for
+   P/Invoke: function prototypes and POD structs. Anything it does not
+   recognise is rejected immediately (see constraint 1). A full libclang
+   integration was considered and rejected: it would add ~40–50 MB of native
+   binary dependencies to the dotnet tool package without materially improving
+   correctness within the blittable-only constraint. See
+   [open-questions.md](open-questions.md) item 5 for the full rationale.
 
 ### Supported C types
 
@@ -191,5 +197,8 @@ Indicators of scope creep (flag these in code review):
 - A function or type name references a specific application domain
   (audio, video, ML model name, etc.)
 - The codegen tool learns about specific library ABIs by name
-- Any native code beyond the trivial `ferrum_add()` test stub is added to
-  `native/test_stub/`
+- Any native code beyond the trivial test fixtures is added to `native/`
+
+The in-tree test fixtures (`test_stub/`, `dsp_fixture/`) are explicitly exempt
+from the scope rule — they exist solely to prove the framework plumbing works
+with different parameter patterns, not to implement any application logic.
diff --git a/docs/getting-started.md b/docs/getting-started.md
@@ -203,6 +203,63 @@ dotnet build samples/MinimalDemo/MinimalDemo.csproj -f net9.0-ios -c Release
 
 ---
 
+## NativeAOT on a real iOS device — manual verification
+
+> **TODO (issue):** Automated CI verification on a physical device is not
+> currently wired up. Physical device builds require a paid Apple Developer
+> account and provisioning profiles, which cannot be stored in a public
+> repository. Track this as a known gap until a self-hosted runner with a
+> provisioned device is available.
+
+Until automated CI coverage is in place, run the following steps manually
+whenever `NativeBuffer<T>` or the generated bindings change:
+
+### Prerequisites
+
+- macOS with Xcode 15+ and a valid iOS Developer provisioning profile
+- An iOS device running iOS 15.0 or later
+- .NET SDK 9.0 with the MAUI workload (`dotnet workload install maui`)
+
+### Steps
+
+1. **Build the native fixture:**
+
+   ```bash
+   ./native/scripts/build_ios.sh --target ferrum_test_stub
+   ./native/scripts/build_ios.sh --target ferrum_dsp_fixture
+   ```
+
+2. **Reference the XCFrameworks** in `samples/MinimalDemo/MinimalDemo.csproj`
+   (uncomment the `<NativeReference>` items).
+
+3. **Build in Release/NativeAOT mode for a physical device:**
+
+   ```bash
+   dotnet build samples/MinimalDemo/MinimalDemo.csproj \
+     -f net9.0-ios \
+     -c Release \
+     -p:RuntimeIdentifier=ios-arm64 \
+     -p:_BundlerExecutable=mtouch
+   ```
+
+4. **Install and run on the device.**  Open Xcode → Window → Devices and
+   Simulators, drag the `.ipa` to your device, and tap it.
+
+5. **Verify the following under NativeAOT** (check Xcode console output):
+   - `NativeBuffer<float>` pins memory and returns a non-null `TypedPointer`.
+   - `ferrum_add(3, 4)` returns `7`.
+   - `ferrum_dsp_scale` operates in-place on a float buffer without crashing.
+   - `ferrum_dsp_stats` fills a `FerrumDspStats` struct with correct values.
+   - No interpreter fallback messages appear (look for `Falling back to interpreter`
+     — there should be none).
+   - The app does not throw `MissingRuntimeArtifactException` or any
+     reflection-related exception.
+
+6. **Record the result** in the PR description, including the device model,
+   iOS version, and .NET SDK version used.
+
+---
+
 ## CMake integration in your own project
 
 If your native library has its own `CMakeLists.txt`, you can use the Ferrum