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2022-11-21 18:32:40 +00:00
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<header id="title-block-header">
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<h1 class="title">IDE support in the JDK</h1>
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</header>
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2022-11-21 18:32:40 +00:00
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<nav id="TOC" role="doc-toc">
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<ul>
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<li><a href="#introduction" id="toc-introduction">Introduction</a>
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<ul>
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<li><a href="#ide-support-for-native-code"
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id="toc-ide-support-for-native-code">IDE support for native
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code</a></li>
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<li><a href="#ide-support-for-java-code"
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id="toc-ide-support-for-java-code">IDE support for Java code</a></li>
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</ul></li>
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</ul>
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<h2 id="introduction">Introduction</h2>
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<p>When you are familiar with building and testing the JDK, you may want
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to configure an IDE to work with the source code. The instructions
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differ a bit depending on whether you are interested in working with the
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native (C/C++) or the Java code.</p>
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<h3 id="ide-support-for-native-code">IDE support for native code</h3>
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<p>There are a few ways to generate IDE configuration for the native
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sources, depending on which IDE to use.</p>
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<h4 id="visual-studio-code">Visual Studio Code</h4>
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<p>The make system can generate a <a
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href="https://code.visualstudio.com">Visual Studio Code</a> workspace
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that has C/C++ source indexing configured correctly, as well as launcher
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targets for tests and the Java launcher. After configuring, a workspace
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for the configuration can be generated using:</p>
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<pre class="shell"><code>make vscode-project</code></pre>
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<p>This creates a file called <code>jdk.code-workspace</code> in the
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build output folder. The full location will be printed after the
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workspace has been generated. To use it, choose
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<code>File -> Open Workspace...</code> in Visual Studio Code.</p>
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<h5 id="alternative-indexers">Alternative indexers</h5>
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<p>The main <code>vscode-project</code> target configures the default
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C++ support in Visual Studio Code. There are also other source indexers
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that can be installed, that may provide additional features. It's
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currently possible to generate configuration for two such indexers, <a
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href="https://clang.llvm.org/extra/clangd/">clangd</a> and <a
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href="https://github.com/Andersbakken/rtags">rtags</a>. These can be
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configured by appending the name of the indexer to the make target, such
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as:</p>
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<pre class="shell"><code>make vscode-project-clangd</code></pre>
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<p>Additional instructions for configuring the given indexer will be
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displayed after the workspace has been generated.</p>
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<h4 id="visual-studio">Visual Studio</h4>
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<p>The make system can generate a Visual Studio project for the Hotspot
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native source. After configuring, the project is generated using:</p>
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<pre class="shell"><code>make hotspot-ide-project</code></pre>
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<p>This creates a file named <code>jvm.vcxproj</code> in
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<code>ide\hotspot-visualstudio</code> subfolder of the build output
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folder. The file can be opened in Visual Studio via
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<code>File -> Open -> Project/Solution</code>.</p>
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<h4 id="eclipse-cdt">Eclipse CDT</h4>
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<p>The make system can generate an Eclipse CDT Workspace that enables
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Eclipse indexing for the C and C++ sources throughout the entire
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codebase, as well as registering all common make targets to be runnable
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from the Eclipse explorer. This can be done after configuring by
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running:</p>
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<pre><code>make eclipse-native-env</code></pre>
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<p>After this is run, simply open and import the workspace in Eclipse
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through
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<code>File -> Import -> Projects from Folder or Archive</code> and
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at <code>Import source</code> click on the directory
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<code>ide\eclipse</code>, which can be found in the build output
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folder.</p>
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<p>If this doesn't work, you can also try
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<code>File -> Import -> Existing Projects into Workspace</code>
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instead.</p>
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<p>Setting up an Eclipse Workspace is relatively lightweight compared to
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other supported IDEs, but requires that your CDT installation has Cross
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GCC support enabled at the moment, even if you aren't cross compiling.
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The Visual C++ compiler is, at present, not supported as an indexer.</p>
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<p>If desired, you can instead request make to only include indexing
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support for just the Java Virtual Machine instead of the entire native
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codebase, by running:</p>
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<pre><code>make eclipse-hotspot-env</code></pre>
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<p>If you think your particular Eclipse installation can handle the
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strain, the make system also supports generating a combined Java and
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C/C++ Workspace for Eclipse which can then conveniently switch between
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Java and C/C++ natures during development by running:</p>
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<pre><code>make eclipse-mixed-env</code></pre>
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<p>Do note that this generates all features that come with both Java and
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C/C++ natures.</p>
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<p>By default, the Eclipse Workspace is located in the ide subdirectory
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in the build output. To share the JDK's source directory with the
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Eclipse Workspace, you can instead run:</p>
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<pre><code>make eclipse-shared-<ENV>-env</code></pre>
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<p>Eclipse support in the JDK is relatively new, so do keep in mind that
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not everything may work at the moment. As such, the resulting Workspace
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also has compilation database parsing support enabled, so you can pass
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Eclipse the compile commands file (see below) if all else fails.</p>
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<h4 id="compilation-database">Compilation Database</h4>
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<p>The make system can generate generic native code indexing support in
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the form of a <a
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href="https://clang.llvm.org/docs/JSONCompilationDatabase.html">Compilation
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Database</a> that can be used by many different IDEs and source code
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indexers.</p>
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<pre class="shell"><code>make compile-commands</code></pre>
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<p>It's also possible to generate the Compilation Database for the
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HotSpot source code only, which is a bit faster as it includes less
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information.</p>
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<pre class="shell"><code>make compile-commands-hotspot</code></pre>
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<h3 id="ide-support-for-java-code">IDE support for Java code</h3>
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<h4 id="intellij-idea">IntelliJ IDEA</h4>
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<p>The JDK project has a script that can be used for indexing the
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project with IntelliJ. After configuring and building the JDK, an
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IntelliJ workspace can be generated by running the following command in
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the top-level folder of the cloned repository:</p>
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<pre class="shell"><code>bash bin/idea.sh</code></pre>
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<p>To use it, choose <code>File -> Open...</code> in IntelliJ and
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select the folder where you ran the above script.</p>
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<p>Next, configure the project SDK in IntelliJ. Open
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<code>File -> Project Structure -> Project</code> and select
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<code>build/<config>/images/jdk</code> as the SDK to use.</p>
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<p>In order to run the tests from the IDE, you can use the JTReg plugin.
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Instructions for building and using the plugin can be found <a
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href="https://github.com/openjdk/jtreg/tree/master/plugins/idea">here</a>.</p>
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<h4 id="eclipse">Eclipse</h4>
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<p>Eclipse JDT is a widely used Java IDE and has been for a very long
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time, being a popular choice alongside IntelliJ IDEA for Java
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development. Likewise, the JDK now includes support for developing its
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Java sources with Eclipse, which can be achieved by setting up a Java
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Workspace by running:</p>
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<pre><code>make eclipse-java-env</code></pre>
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<p>After the workspace has been generated you can import it in the same
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way as you would with Eclipse CDT:</p>
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<p>Follow
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<code>File -> Import -> Projects from Folder or Archive</code> and
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select the <code>ide\eclipse</code> directory in the build output folder
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to import the newly created Java Workspace.</p>
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<p>If doing so results in an error, you can also import the JDK via
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<code>File -> Import -> Existing Projects into Workspace</code> as
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a last resort.</p>
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<p>Alternatively, if you want a Java Workspace inside the JDK's source
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directory, you can instead run:</p>
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<pre><code>make eclipse-shared-java-env</code></pre>
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<p>As mentioned above for Eclipse CDT, you can create a combined Java
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and C/C++ Workspace which can conveniently switch between Java and C/C++
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natures during development by running:</p>
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<pre><code>make eclipse-mixed-env</code></pre>
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