Fix pkl.h header include path for Exec.configureCompile - #1123
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Otherwise the main interface `pkl.h` won't be present in the generated library directory.
bioball
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Jul 14, 2025
KushalP
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Jul 22, 2025
This introduces native C bindings for Pkl.
Dynamic Library
---------------
Using `org.graalvm.nativeimage` and the `native-image` binary we
produce a dynamic library (for each OS/Arch variant) that provides a
way to initialise itself with a `graal_isolatethread_t`.
Methods are annotated with `@CEntryPoint` and exported.
This change results in an architecture and OS-specific directory being
created which now produces the headers for our shared library
functions:
```
❯ ll libpkl/build/libs/macos-aarch64/
graal_isolate_dynamic.h
graal_isolate.h
libpkl-internal_dynamic.h
libpkl-internal-macos-aarch64_dynamic.h
libpkl-internal-macos-aarch64.dylib
libpkl-internal-macos-aarch64.h
libpkl-internal.dylib
libpkl-internal.h
```
`libpkl`
--------
The produced `libpkl` dynamic library wraps the GraalVM C interface
into something that is future-friendly for the needs of a Pkl
integrator. It exports an interface which aligns with SPICE-0015[1].
```
❯ ll libpkl/build/libs/macos-aarch64/
graal_isolate_dynamic.h
graal_isolate.h
libpkl-internal_dynamic.h
libpkl-internal-macos-aarch64_dynamic.h
libpkl-internal-macos-aarch64.dylib
libpkl-internal-macos-aarch64.h
libpkl-internal.dylib
libpkl-internal.h
libpkl.dylib <--- this is new
libpkl.h <--- this is new
```
JNA
---
Testing of the produced `libpkl` dynamic library is done using Java
Native Access[2] for ease. We provide an `interface` in Kotlin which
JNA transposes against the `libpkl` dynamic library discoverable at
the path that is discoverable with `jna.library.path`.
Load in `projects.pklCommonsCli` to deal with `UnsupportedFeatureException`
---------------------------------------------------------------------------
This is to deal with the following error:
```
Caused by: com.oracle.graal.pointsto.constraints.UnsupportedFeatureException: Detected a started Thread in the image heap. Thread name: main. Threads running in the image generator are no longer running at image runtime. If these objects should not be stored in the image heap, you can use
'--trace-object-instantiation=java.lang.Thread'
```
[1] apple/pkl-evolution#16
Rename to `LibPklLibrary`
Remove `lib` prefix from `.h` and `.c` files
Add doxygen-style comments to `pkl.h` file
Move pointer next to variable name
Add TODO comment to clean this up once on a feature-branch
Add `@SuppressWarnings("unused")` annotation to `LibPkl` class
Move `LibPkl` constructor between fields and methods
Add `package-info.java` for `org.pkl.libpkl` package
Propagate param `handlerContext` so users can trace messages
This allows a user to provide a pointer, and have it be passed through
and back to their `PklMessageResponseHandler` handler for them track
as part of their own bookkeeping.
Drop the OS and Arch name from the `native-image` shared library
TODO: Provide a meaningful error to user if `cb == null`
Log exceptions in `NativeTransport`
Address PR comments
Gradle adjustments for libpkl (#1081)
* Move native tests into `nativeTest` source set; they are now run with `./gradlew testNative` and skipped in `./gradlew test`.
* Fix native tests to be platform independent
* In `NativeImageBuild`: Add `abstract val sharedLibrary: Property<Boolean>` property to `NativeImageBuild`
* In `NativeImageBuild`: Make `mainClass` optional
* Introduce enum class `Target`, which enumerates over all the target machines that we support building
* Simplify build logic (move common logic into `configure()` extension methods)
* Remove `LibPkl.main`, which is no longer needed
* Run `libpkl` tests in CircleCI (let's run these for now on this branch, but let's remove it prior to merging).
Make libpkl tests use AbstractServerTest (#1084)
* Move AbstractServerTest and its dependencies into pkl-commons-test
* Make LibPklTest implement AbstractServerTest
* Rename "NativeTest" -> "LibPklTest"
* Rename "LibPklLibrary" -> "LibPklJNA"
Fix `pkl.h` header include path for `Exec.configureCompile` (#1123)
Otherwise the main interface `pkl.h` won't be present in the generated
library directory.
Expose version of Pkl within native library using `pkl_version` (#1124)
* Be consistent: use `userData` as parameter name, as per SPICE
* Expose version of Pkl within native library using `pkl_version`
This allows consumers of the native library to know which version of
Pkl they're using, e.g. to build version-specific gates around newer
functionality.
Run `graal_attach_thread` ahead of all calls (#1131)
* Rename `isolatethread` to `graal_isolatethread`
* Run `graal_attach_thread` ahead of all calls
This is to deal with the case when using a language like Golang, where
a Goroutine is managed by the runtime, and can be moved to an
arbitrary system thread behind the scenes.
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Otherwise the main interface
pkl.hwon't be present in the generated library directory.