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Support JNA over Static JNI on GraalVM
Implements a new optional linkage feature, called Static JNI, under GraalVM Native Image. With `com.sun.jna.SubstrateStaticJNA` enabled (opt-in), JNA is loaded eagerly at image build time, and then linked against a static copy of `libjnidispatch` at image link-time. The result is that `libjnidispatch.a` is embedded within the final image. No precursor library unpacking step is necessary before using JNA in this circumstance, because JNA's native layer is built directly into the image itself. - feat: implement static jni feature - chore: full gvm ci build - chore: add static jni sample Signed-off-by: Sam Gammon <[email protected]> Signed-off-by: Dario Valdespino <[email protected]> Co-authored-by: Sam Gammon <[email protected]> Co-authored-by: Dario Valdespino <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -23,8 +23,18 @@ | |
| */ | ||
| package com.sun.jna; | ||
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|
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| import com.oracle.svm.core.jdk.NativeLibrarySupport; | ||
| import com.oracle.svm.core.jdk.PlatformNativeLibrarySupport; | ||
| import com.oracle.svm.hosted.FeatureImpl.BeforeAnalysisAccessImpl; | ||
| import org.graalvm.nativeimage.Platform; | ||
| import org.graalvm.nativeimage.hosted.Feature; | ||
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|
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
|
|
||
| /** | ||
| * Feature for use at build time on GraalVM, which enables static JNI support for JNA. | ||
| * | ||
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@@ -36,8 +46,125 @@ | |
| * | ||
| * <p>This class extends the base {@link com.sun.jna.JavaNativeAccess} feature by providing JNA's JNI layer statically, | ||
| * so that no library unpacking step needs to take place. | ||
| * | ||
| * @since 5.15.0 | ||
| * @author Sam Gammon ([email protected]) | ||
| * @author Dario Valdespino ([email protected]) | ||
| */ | ||
| public final class SubstrateStaticJNA extends AbstractJNAFeature { | ||
| /** | ||
| * Name for the FFI native library used during static linking by Native Image. | ||
| */ | ||
| private static final String FFI_LINK_NAME = "ffi"; | ||
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|
||
| /** | ||
| * Name for the JNI Dispatch native library used during static linking by Native Image. | ||
| */ | ||
| private static final String JNA_LINK_NAME = "jnidispatch"; | ||
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|
||
| /** | ||
| * Name prefix used by native functions from the JNI Dispatch library. | ||
| */ | ||
| private static final String JNA_NATIVE_LAYOUT = "com_sun_jna_Native"; | ||
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|
||
| /** | ||
| * Name of the JNI Dispatch static library on UNIX-based platforms. | ||
| */ | ||
| private static final String JNI_DISPATCH_UNIX_NAME = "libjnidispatch.a"; | ||
|
|
||
| /** | ||
| * Name of the JNI Dispatch static library on Windows. | ||
| */ | ||
| private static final String JNI_DISPATCH_WINDOWS_NAME = "jnidispatch.lib"; | ||
|
|
||
| /** | ||
| * Name of the FFI static library on UNIX-based platforms. | ||
| */ | ||
| private static final String FFI_UNIX_NAME = "libffi.a"; | ||
|
|
||
| /** | ||
| * Name of the FFI static library on Windows. | ||
| */ | ||
| private static final String FFI_WINDOWS_NAME = "ffi.lib"; | ||
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|
||
| /** | ||
| * Returns the name of the static JNI Dispatch library for the current platform. On UNIX-based systems, | ||
| * {@link #JNI_DISPATCH_UNIX_NAME} is used; on Windows, {@link #JNI_DISPATCH_WINDOWS_NAME} is returned instead. | ||
| * | ||
| * @see #getStaticLibraryResource | ||
| * @return The JNI Dispatch library name for the current platform. | ||
| */ | ||
| private static String getStaticLibraryFileName() { | ||
| if (Platform.includedIn(Platform.WINDOWS.class)) return JNI_DISPATCH_WINDOWS_NAME; | ||
| if (Platform.includedIn(Platform.LINUX.class)) return JNI_DISPATCH_UNIX_NAME; | ||
| if (Platform.includedIn(Platform.DARWIN.class)) return JNI_DISPATCH_UNIX_NAME; | ||
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|
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| // If the current platform is not in the Platform class, this code would not run at all | ||
| throw new UnsupportedOperationException("Current platform does not support static linking"); | ||
| } | ||
|
|
||
| /** | ||
| * Returns the name of the static FFI library for the current platform. On UNIX-based systems, | ||
| * {@link #FFI_UNIX_NAME} is used; on Windows, {@link #FFI_WINDOWS_NAME} is returned instead. | ||
| * | ||
| * @see #getStaticLibraryResource | ||
| * @return The FFI library name for the current platform. | ||
| */ | ||
| private static String getFFILibraryFileName() { | ||
| if (Platform.includedIn(Platform.WINDOWS.class)) return FFI_WINDOWS_NAME; | ||
| if (Platform.includedIn(Platform.LINUX.class)) return FFI_UNIX_NAME; | ||
| if (Platform.includedIn(Platform.DARWIN.class)) return FFI_UNIX_NAME; | ||
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| // If the current platform is not in the Platform class, this code would not run at all | ||
| throw new UnsupportedOperationException("Current platform does not support static FFI"); | ||
| } | ||
|
|
||
| /** | ||
| * Returns the full path to the static JNI Dispatch library embedded in the JAR, accounting for platform-specific | ||
| * library names. | ||
| * | ||
| * @see #getStaticLibraryFileName() | ||
| * @return The JNI Dispatch library resource path for the current platform. | ||
| */ | ||
| private static String getStaticLibraryResource() { | ||
| return "/com/sun/jna/" + com.sun.jna.Platform.RESOURCE_PREFIX + "/" + getStaticLibraryFileName(); | ||
| } | ||
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|
||
| /** | ||
| * Returns the full path to the static FFI library which JNA depends on, accounting for platform-specific | ||
| * library names. | ||
| * | ||
| * @see #getFFILibraryFileName() | ||
| * @return The FFI library resource path for the current platform. | ||
| */ | ||
| private static String getFFILibraryResource() { | ||
| return "/com/sun/jna/" + com.sun.jna.Platform.RESOURCE_PREFIX + "/" + getFFILibraryFileName(); | ||
| } | ||
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|
||
| /** | ||
| * Extracts a library resource and returns the file it was extracted to. | ||
| * | ||
| * @param resource Resource path for the library to extract. | ||
| * @param filename Expected filename for the library. | ||
| * @return The extracted library file. | ||
| */ | ||
| private static File unpackLibrary(String resource, String filename) { | ||
| // Unpack the static library from resources so Native Image can use it | ||
| File extractedLib; | ||
| try { | ||
| extractedLib = Native.extractFromResourcePath(resource, Native.class.getClassLoader()); | ||
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| // The library is extracted into a file with a `.tmp` name, which will not be picked up by the linker | ||
| // We need to rename it first using the platform-specific convention or the build will fail | ||
| File platformLib = new File(extractedLib.getParentFile(), filename); | ||
| if (!extractedLib.renameTo(platformLib)) throw new IllegalStateException("Renaming extract file failed"); | ||
| extractedLib = platformLib; | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Failed to extract native dispatch library from resources", e); | ||
| } | ||
| return extractedLib; | ||
| } | ||
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| @Override | ||
| public String getDescription() { | ||
| return "Enables optimized static access to JNA at runtime"; | ||
|
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@@ -48,8 +175,34 @@ public boolean isInConfiguration(IsInConfigurationAccess access) { | |
| return access.findClassByName(JavaNativeAccess.NATIVE_LAYOUT) != null; | ||
| } | ||
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| @Override | ||
| public List<Class<? extends Feature>> getRequiredFeatures() { | ||
| return Collections.singletonList(JavaNativeAccess.class); | ||
| } | ||
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| @Override | ||
| public void beforeAnalysis(BeforeAnalysisAccess access) { | ||
| // | ||
| var nativeLibraries = NativeLibrarySupport.singleton(); | ||
| var platformLibraries = PlatformNativeLibrarySupport.singleton(); | ||
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| // Register as a built-in library with Native Image and set the name prefix used by native symbols | ||
| nativeLibraries.preregisterUninitializedBuiltinLibrary(JNA_LINK_NAME); | ||
| platformLibraries.addBuiltinPkgNativePrefix(JNA_NATIVE_LAYOUT); | ||
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| // Extract the main JNA library from the platform-specific resource path; next, extract the FFI | ||
| // library it depends on | ||
| unpackLibrary(getFFILibraryResource(), getFFILibraryFileName()); | ||
| var extractedLib = unpackLibrary(getStaticLibraryResource(), getStaticLibraryFileName()); | ||
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| // WARNING: the static JNI linking feature is unstable and may be removed in the future; | ||
| // this code uses the access implementation directly in order to register the static library. We | ||
| // inform the Native Image compiler that JNA depends on `ffi`, so that it forces it to load first | ||
| // when JNA is initialized at image runtime. | ||
| var nativeLibsImpl = ((BeforeAnalysisAccessImpl) access).getNativeLibraries(); | ||
| nativeLibsImpl.addStaticNonJniLibrary(FFI_LINK_NAME); | ||
| nativeLibsImpl.addStaticJniLibrary(JNA_LINK_NAME, FFI_LINK_NAME); | ||
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| // Enhance the Native Image lib paths so the injected static libraries are available to the linker | ||
| nativeLibsImpl.getLibraryPaths().add(extractedLib.getParentFile().getAbsolutePath()); | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| /.gradle | ||
| /build |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,10 @@ | ||
| # JNA Sample: GraalVM Native Image (Static) | ||
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| This directory contains a sample Gradle project which uses JNA with [GraalVM](https://graalvm.org/). The project builds a | ||
| [native image](https://www.graalvm.org/latest/reference-manual/native-image/) which uses JNA features, powered by JNA's integration library for Substrate. | ||
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| This sample leverages [Static JNI](https://www.blog.akhil.cc/static-jni) to build JNA and JNA-related user code | ||
| directly into the native image. | ||
|
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| Using this technique can optimize startup time and other performance factors, because no dynamic library unpack-and-load | ||
| step is required to use JNA. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /* Copyright (c) 2015 Adam Marcionek, All Rights Reserved | ||
| * | ||
| * The contents of this file is dual-licensed under 2 | ||
| * alternative Open Source/Free licenses: LGPL 2.1 or later and | ||
| * Apache License 2.0. (starting with JNA version 4.0.0). | ||
| * | ||
| * You can freely decide which license you want to apply to | ||
| * the project. | ||
| * | ||
| * You may obtain a copy of the LGPL License at: | ||
| * | ||
| * http://www.gnu.org/licenses/licenses.html | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "LGPL2.1". | ||
| * | ||
| * You may obtain a copy of the Apache License at: | ||
| * | ||
| * http://www.apache.org/licenses/ | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "AL2.0". | ||
| */ | ||
| plugins { | ||
| java | ||
| application | ||
| alias(libs.plugins.graalvm) | ||
| } | ||
|
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| application { | ||
| mainClass = "com.example.JnaNative" | ||
| } | ||
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| java { | ||
| toolchain { | ||
| languageVersion = JavaLanguageVersion.of(22) | ||
| vendor = JvmVendorSpec.GRAAL_VM | ||
| } | ||
| } | ||
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| dependencies { | ||
| implementation(libs.bundles.jna) | ||
| implementation(libs.bundles.graalvm.api) | ||
| nativeImageClasspath(libs.jna.graalvm) | ||
| } | ||
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| val nativeImageDebug: String by properties | ||
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| graalvmNative { | ||
| testSupport = true | ||
| toolchainDetection = false | ||
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| binaries { | ||
| named("main") { | ||
| buildArgs.addAll(listOf( | ||
| "--features=com.sun.jna.SubstrateStaticJNA", | ||
| ).plus(if (nativeImageDebug != "true") emptyList() else listOf( | ||
| "--verbose", | ||
| "--debug-attach", | ||
| "-J-Xlog:library=info", | ||
| "-H:+UnlockExperimentalVMOptions", | ||
| "-H:+JNIEnhancedErrorCodes", | ||
| "-H:+SourceLevelDebug", | ||
| "-H:-DeleteLocalSymbols", | ||
| "-H:-RemoveUnusedSymbols", | ||
| "-H:+PreserveFramePointer", | ||
| "-H:+ReportExceptionStackTraces", | ||
| "-H:CCompilerOption=-v", | ||
| "-H:NativeLinkerOption=-v", | ||
| ))) | ||
| } | ||
| } | ||
| } | ||
|
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| // Allow the outer Ant build to override the version of JNA or GraalVM. | ||
| // These properties are used in JNA's CI and don't need to be in projects that use JNA. | ||
|
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| val jnaVersion: String by properties | ||
| val graalvmVersion: String by properties | ||
| val overrides = jnaVersion.isNotBlank() || graalvmVersion.isNotBlank() | ||
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| if (overrides) configurations.all { | ||
| resolutionStrategy.eachDependency { | ||
| if (requested.group == "net.java.dev.jna") { | ||
| useVersion(jnaVersion) | ||
| because("overridden by ant build") | ||
| } | ||
| if (requested.group == "org.graalvm") { | ||
| useVersion(graalvmVersion) | ||
| because("overridden by ant build") | ||
| } | ||
| } | ||
| } |
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