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