jdk-24/test/langtools/tools/javac/platform/CanHandleClassFilesTest.java

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/**
 * @test
 * @bug 8207954
 * @summary Verify that CreateSymbols can handle classfiles from the current release.
 * @library /tools/lib /tools/javac/lib
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 * @build toolbox.ToolBox toolbox.JavacTask toolbox.Task
 * @run main CanHandleClassFilesTest
 */

import java.io.Writer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import javax.tools.StandardLocation;

import toolbox.JavacTask;
import toolbox.ToolBox;

public class CanHandleClassFilesTest {

    public static void main(String... args) throws Exception {
        new CanHandleClassFilesTest().run();
    }

    void run() throws Exception {
        var testSrc = Paths.get(System.getProperty("test.src", "."));
        var targetDir = Paths.get(".");
        Path createSymbols = null;
        Path includeList = null;
        for (Path d = testSrc; d != null; d = d.getParent()) {
            if (Files.exists(d.resolve("TEST.ROOT"))) {
                d = d.getParent().getParent();
                Path test = d.resolve("make/langtools/src/classes/build/tools/symbolgenerator/CreateSymbols.java");
                if (Files.exists(test)) {
                    createSymbols = test;
                    includeList = d.resolve("make/data/symbols/include.list");
                    break;
                }
            }
        }
        if (createSymbols == null || includeList == null || !Files.isReadable(includeList)) {
            System.err.println("Warning: sources not found, test skipped.");
            return ;
        }
        try (ToolBox.MemoryFileManager mfm = new ToolBox.MemoryFileManager()) {
            ToolBox tb = new ToolBox();
            new JavacTask(tb)
              .options("--add-exports", "jdk.jdeps/com.sun.tools.classfile=ALL-UNNAMED",
                       "--add-exports", "jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
                       "--add-exports", "jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED",
                       "--add-exports", "jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
                       "--add-modules", "jdk.jdeps")
              .files(createSymbols)
              .fileManager(mfm)
              .run()
              .writeAll();

            ClassLoader cl = new ClassLoader() {
                @Override
                protected Class<?> findClass(String name) throws ClassNotFoundException {
                    byte[] data = mfm.getFileBytes(StandardLocation.CLASS_OUTPUT, name);
                    if (data != null) {
                        return defineClass(name, data, 0, data.length);
                    } else {
                        throw new ClassNotFoundException(name);
                    }
                }
            };

            var createSymbolsClass = Class.forName("build.tools.symbolgenerator.CreateSymbols", false, cl);
            var main = createSymbolsClass.getDeclaredMethod("main", String[].class);
            var symbols = targetDir.resolve("symbols");

            try (Writer w = Files.newBufferedWriter(symbols)) {}

            main.invoke(null,
                        (Object) new String[] {"build-description-incremental",
                                               symbols.toAbsolutePath().toString(),
                                               includeList.toAbsolutePath().toString()});

            main.invoke(null,
                        (Object) new String[] {"build-ctsym",
                                               "does-not-exist",
                                               symbols.toAbsolutePath().toString(),
                                               targetDir.resolve("ct.sym").toAbsolutePath().toString()});
        }
    }

}