mirror of
https://github.com/mappu/miqt.git
synced 2024-12-23 01:18:37 +00:00
51 lines
2.2 KiB
Markdown
51 lines
2.2 KiB
Markdown
# genbindings
|
|
|
|
The `genbindings` program regenerates the Qt bindings.
|
|
|
|
## Architecture design
|
|
|
|
Bindings are generated in two passes:
|
|
|
|
Pass 1
|
|
|
|
1. Scan input directory for header files.
|
|
2. For each header file:
|
|
3. Run `clang --ast-dump=json` to get a JSON ast.
|
|
- This is somewhat slow, the results will be cached in `./cachedir` after the first run.
|
|
- Strip all Clang AST nodes that were included from other files, to only consider the header's own definitions.
|
|
4. Convert Clang AST to our own intermediate representation.
|
|
5. Run some transformations on the intermediate representation.
|
|
6. Cache and collect the global state of all known class names, enum names, and typedefs.
|
|
|
|
Pass 2
|
|
|
|
1. For each intermediate-representation AST:
|
|
2. Emit "CABI" cpp/h pair.
|
|
- The CABI is a projection of Qt into plain C. The translation unit itself is C++, but the header can be used as extern c.
|
|
3. Emit Go binding file.
|
|
- The Go binding uses CGO to call into the CABI binding.
|
|
|
|
## Configuration
|
|
|
|
It's tested to work on with Debian 12 with system packages (Qt 5.15 / Qt 6.4 / Clang 14 / GCC 12).
|
|
|
|
You should check the following configuration:
|
|
|
|
- `config-libraries.go`: Input directories containing Qt headers
|
|
- `config-allowlist.go`: Check everything
|
|
|
|
## Steps to add extra libraries to MIQT
|
|
|
|
1. Git clone this repository
|
|
2. In `docker/genbindings.Dockerfile`, add your library's headers and pkg-config file.
|
|
- If your library does not include a pkg-config file, [you must create one.](pkg-config/README.md)
|
|
3. Patch `cmd/genbindings/config-libraries.go` to add a new `generate` block for your target library
|
|
4. Run `genbindings` to regenerate all bindings
|
|
- The first run must populate clang ASTs into a cache directory and may be slower, but it is fast afterwards
|
|
5. Add a `cflags.go` file to the generated binding directory
|
|
- It should have a `#cgo pkg-config: LibraryName` stanza and any extra flags (e.g. `--std=c++17`) that are required but not system-specific
|
|
6. Try to use the new binding within the repo, by adding an example in the `examples/libraries` directory
|
|
7. Commit the generated bindings
|
|
- You can then use your forked MIQT repo with `replace` inside `go.mod`
|
|
- Or, [open a Pull Request](https://github.com/mappu/miqt/compare) to add the library to MIQT
|