FFIgenPad

.github/workflows/ffigenpad.yml

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+name: ffigenpad
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - ".github/workflows/ffigenpad.yaml"
+      - "pkgs/ffigenpad/**"
+  push:
+    branches: [main]
+    paths:
+      - ".github/workflows/ffigenpad.yaml"
+      - "pkgs/ffigenpad/**"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9a9194f87191a7e9055e3e9b95b8cfb13023bb08
+
+      - uses: dart-lang/setup-dart@e9a814f39d5452701455a47847735e0f482026c8
+        with:
+          sdk: dev
+
+      - run: dart pub get
+        working-directory: pkgs/ffigenpad
+
+      - uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021
+        with:
+          version: 3.1.61
+
+      - name: setup ffigenpad
+        working-directory: pkgs/ffigenpad
+        run: dart run tool/setup.dart
+
+      - name: build libclang.wasm
+        working-directory: pkgs/ffigenpad
+        run: dart run tool/build_libclang.dart --optimize
+
+      - name: build ffigenpad
+        working-directory: pkgs/ffigenpad
+        run: |
+          dart compile wasm ./lib/ffigenpad.dart -o ./bin/ffigenpad.wasm -O3 \
+            --extra-compiler-option=--enable-experimental-ffi \
+            --extra-compiler-option=--enable-experimental-wasm-interop
+
+      - uses: pnpm/action-setup@ac5bf11548bf5e19b8aadb8182072616590fa4a6
+        with:
+          version: 9.7.0
+          run_install: |
+            - cwd: pkgs/ffigenpad/web
+
+      - uses: actions/configure-pages@aabcbc432d6b06d1fd5e8bf3cf756880c35e014d
+
+      - name: build website
+        working-directory: pkgs/ffigenpad/web
+        run: pnpm build
+
+      - uses: actions/upload-pages-artifact@1780dfc2cece65a782cc86fa133f96aef8ad0345
+        with:
+          path: pkgs/ffigenpad/web/dist
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/deploy-pages@b74272834adc04f971da4b0b055c49fa8d7f90c9

pkgs/ffigenpad/CHANGELOG.md

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+## 0.1.0
+
+- Initial version.

pkgs/ffigenpad/README.md

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+# FFIgenPad
+
+A web interface in which you paste a C header in a textbox on the left, and it outputs `dart:ffi` bindings generated by `package:ffigen` in a textbox on the right. (Inspiration is https://godbolt.org/ which does this for a C file on the left and assembly on the right.)
+
+It doesn't need a server cause it compiles the Dart code in `package:ffigen` and libclang to WASM. That way everything can run in the browser.
+
+------
+
+## Project Structure
+
+Most of the files in `lib/src/` are copied from the source of *ffigen* with modifications to make it compatible with dart2wasm (many of the workarounds are listed in [this blog article](https://thecomputerm.hashnode.dev/dirty-deeds-done-dart-cheap-experiments-with-dart2wasm)).
+
+However the files listed do not have an ffigen counterpart:
+- [./lib/ffigenpad.dart](./lib/ffigenpad.dart)
+- [./lib/memfs.dart](./lib/memfs.dart)
+- [./lib/src/header_parser/calloc.dart](./lib/src/header_parser/calloc.dart)
+- [./lib/src/header_parser/clang_bindings/clang_types.dart](./lib/src/header_parser/clang_bindings/clang_types.dart)
+- [./lib/src/header_parser/clang_bindings/clang_wrapper.dart](./lib/src/header_parser/clang_bindings/clang_wrapper.dart)
+
+## Building
+
+### Prerequisites
+
+- dart
+- emscripten (>= 3.1.61)
+- for website
+  - nodejs (>= ^20.17.0)
+  - pnpm (optional but recommended)
+
+### Steps
+
+- Run `tool/setup.dart` to download LLVM archive files to build *libclang.wasm*
+
+```sh
+# in project root
+dart run tool/setup.dart
+```
+
+- Run `tool/build_libclang.dart` to build *libclang.wasm* using functions exported from *third_party/libclang/libclang.exports*
+
+```sh
+# in project root
+dart run tool/build_libclang.dart
+```
+
+- Build FFIgenPad using the experimental dart2wasm compiler
+
+```sh
+# in project root
+dart compile wasm ./lib/ffigenpad.dart -o ./bin/ffigenpad.wasm \
+    --extra-compiler-option=--enable-experimental-ffi \
+    --extra-compiler-option=--enable-experimental-wasm-interop
+```
+
+- To build the website
+
+```sh
+# in project root
+cd web
+npm i # install dependencies
+npm run build
+# preview with: npm run preview
+```

pkgs/ffigenpad/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:dart_flutter_team_lints/analysis_options.yaml
+
+# Uncomment the following section to specify additional rules.
+
+linter:
+  rules:
+    implementation_imports: false
+
+analyzer:
+  errors:
+    todo: ignore
+  language:
+    strict-casts: true
+    strict-inference: true
+    strict-raw-types: true
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

pkgs/ffigenpad/bin/.gitignore

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+*.wasm
+*.mjs
+*.wasm.map

pkgs/ffigenpad/bin/README.md

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+# Overview
+
+Contains build outputs for *libclang.wasm* and *ffigenpad.wasm*.

pkgs/ffigenpad/lib/ffigenpad.dart

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+// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
+
+import 'package:logging/logging.dart';
+import 'package:yaml/yaml.dart';
+
+import 'memfs.dart';
+import 'src/config_provider.dart';
+import 'src/ffigen.dart';
+
+@JS()
+external void setLogs(JSObject logs);
+
+void generate(String yaml) {
+  final ffigen = FfiGen(logLevel: Level.ALL);
+  final config = YamlConfig.fromYaml(loadYaml(yaml) as YamlMap);
+  ffigen.run(config);
+}
+
+void main(List<String> args) {
+  final logs = <JSObject>[];
+  Logger.root.onRecord.listen((record) {
+    final log = JSObject();
+    log.setProperty('level'.toJS, (record.level.value / 100).toJS);
+    log.setProperty('message'.toJS, record.message.toJS);
+
+    logs.add(log);
+  });
+  IOOverrides.runWithIOOverrides(() {
+    generate(args.first);
+  }, MemFSIOOverrides());
+  setLogs(logs.toJS);
+}

pkgs/ffigenpad/lib/memfs.dart

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+// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:convert' as convert;
+import 'dart:io';
+import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
+import 'dart:typed_data';
+
+// adapted functions from https://emscripten.org/docs/api_reference/Filesystem-API.html#id2
+extension type MemFS(JSObject _) implements JSObject {
+  external JSArray<JSString> readdir(String path);
+  external JSUint8Array readFile(String path, [JSObject? opts]);
+  external void writeFile(String path, String data);
+  external void unlink(String path);
+  external void mkdir(String path);
+  external void rmdir(String path);
+  external void rename(String oldpath, String newpath);
+  external String cwd();
+  external void chdir(String path);
+  external JSObject analyzePath(String path, bool dontResolveLastLink);
+}
+
+@JS('FS')
+external MemFS get memfs;
+
+class MemFSDirectory implements Directory {
+  @override
+  String path;
+
+  MemFSDirectory(this.path);
+
+  @override
+  void createSync({bool recursive = false}) {
+    memfs.mkdir(path);
+  }
+
+  @override
+  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+class MemFSFile implements File {
+  @override
+  String path;
+
+  MemFSFile(this.path);
+
+  @override
+  MemFSFile get absolute => MemFSFile(path);
+
+  @override
+  void createSync({bool recursive = false, bool exclusive = false}) {
+    memfs.writeFile(path, '');
+  }
+
+  @override
+  void deleteSync({bool recursive = false}) {
+    memfs.unlink(path);
+  }
+
+  @override
+  bool existsSync() {
+    return memfs
+        .analyzePath(path, false)
+        .getProperty<JSBoolean>('exists'.toJS)
+        .toDart;
+  }
+
+  @override
+  void writeAsStringSync(String contents,
+      {FileMode mode = FileMode.write,
+      convert.Encoding encoding = convert.utf8,
+      bool flush = false}) {
+    memfs.writeFile(path, contents);
+  }
+
+  @override
+  Uint8List readAsBytesSync() {
+    return memfs.readFile(path).toDart;
+  }
+
+  @override
+  String readAsStringSync({convert.Encoding encoding = convert.utf8}) {
+    return encoding.decode(readAsBytesSync());
+  }
+
+  @override
+  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+class MemFSIOOverrides extends IOOverrides {
+  @override
+  MemFSDirectory createDirectory(String path) {
+    return MemFSDirectory(path);
+  }
+
+  @override
+  MemFSFile createFile(String path) {
+    return MemFSFile(path);
+  }
+
+  @override
+  bool fsWatchIsSupported() {
+    return false;
+  }
+
+  @override
+  void setCurrentDirectory(String path) {
+    memfs.chdir(path);
+  }
+
+  @override
+  MemFSDirectory getCurrentDirectory() {
+    return MemFSDirectory(memfs.cwd());
+  }
+
+  @override
+  MemFSDirectory getSystemTempDirectory() {
+    return MemFSDirectory('/tmp');
+  }
+}

pkgs/ffigenpad/lib/src/code_generator.dart

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+// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// Generates FFI bindings for a given Library.
+library;
+
+export 'code_generator/binding.dart';
+export 'code_generator/compound.dart';
+export 'code_generator/constant.dart';
+export 'code_generator/enum_class.dart';
+export 'code_generator/func.dart';
+export 'code_generator/func_type.dart';
+export 'code_generator/global.dart';
+export 'code_generator/handle.dart';
+export 'code_generator/imports.dart';
+export 'code_generator/library.dart';
+export 'code_generator/native_type.dart';
+export 'code_generator/objc_block.dart';
+export 'code_generator/objc_built_in_functions.dart';
+export 'code_generator/objc_interface.dart';
+export 'code_generator/objc_methods.dart';
+export 'code_generator/objc_nullable.dart';
+export 'code_generator/objc_protocol.dart';
+export 'code_generator/pointer.dart';
+export 'code_generator/struct.dart';
+export 'code_generator/type.dart';
+export 'code_generator/typealias.dart';
+export 'code_generator/union.dart';