8290561: Coalesce incubator-module warnings for single-file source-code programs

Reviewed-by: mcimadamore

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Modules.java

@@ -165,6 +165,7 @@ public class Modules extends JCTree.Visitor {
     private final String limitModsOpt;
     private final Set<String> extraLimitMods = new HashSet<>();
     private final String moduleVersionOpt;
+    private final boolean sourceLauncher;
 
     private final boolean lintOptions;
 
@@ -214,6 +215,7 @@ public class Modules extends JCTree.Visitor {
         addModsOpt = options.get(Option.ADD_MODULES);
         limitModsOpt = options.get(Option.LIMIT_MODULES);
         moduleVersionOpt = options.get(Option.MODULE_VERSION);
+        sourceLauncher = options.isSet("sourceLauncher");
     }
 
     int depth = -1;
@@ -1341,9 +1343,9 @@ public class Modules extends JCTree.Visitor {
                 .forEach(result::add);
         }
 
-        String incubatingModules = result.stream()
+        String incubatingModules = filterAlreadyWarnedIncubatorModules(result.stream()
                 .filter(msym -> msym.resolutionFlags.contains(ModuleResolutionFlags.WARN_INCUBATING))
-                .map(msym -> msym.name.toString())
+                .map(msym -> msym.name.toString()))
                 .collect(Collectors.joining(","));
 
         if (!incubatingModules.isEmpty()) {
@@ -1359,6 +1361,15 @@ public class Modules extends JCTree.Visitor {
         }
     }
     //where:
+        private Stream<String> filterAlreadyWarnedIncubatorModules(Stream<String> incubatingModules) {
+            if (!sourceLauncher) return incubatingModules;
+            Set<String> bootModules = ModuleLayer.boot()
+                                                 .modules()
+                                                 .stream()
+                                                 .map(Module::getName)
+                                                 .collect(Collectors.toSet());
+            return incubatingModules.filter(module -> !bootModules.contains(module));
+        }
         private static final Predicate<ModuleSymbol> IS_AUTOMATIC =
                 m -> (m.flags_field & Flags.AUTOMATIC_MODULE) != 0;
 

src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/Main.java

@@ -368,6 +368,7 @@ public class Main {
         javacOpts.add("-Xlint:deprecation");
         javacOpts.add("-Xlint:unchecked");
         javacOpts.add("-Xlint:-options");
+        javacOpts.add("-XDsourceLauncher");
         return javacOpts;
     }
 

test/langtools/tools/javac/launcher/SourceLauncherTest.java

@@ -29,13 +29,22 @@
  * @modules jdk.compiler/com.sun.tools.javac.api
  *          jdk.compiler/com.sun.tools.javac.launcher
  *          jdk.compiler/com.sun.tools.javac.main
+ *          jdk.jdeps/com.sun.tools.classfile
  * @build toolbox.JavaTask toolbox.JavacTask toolbox.TestRunner toolbox.ToolBox
  * @run main SourceLauncherTest
  */
 
+import com.sun.tools.classfile.Attribute;
+import com.sun.tools.classfile.Attributes;
+import com.sun.tools.classfile.ClassFile;
+import com.sun.tools.classfile.ClassWriter;
+import com.sun.tools.classfile.ConstantPool;
+import com.sun.tools.classfile.ConstantPool.CPInfo;
+import com.sun.tools.classfile.ModuleResolution_attribute;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.io.PrintStream;
 import java.io.PrintWriter;
 import java.io.StringWriter;
@@ -45,6 +54,8 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.List;
 import java.util.Properties;
 import java.util.regex.Pattern;
@@ -655,6 +666,83 @@ public class SourceLauncherTest extends TestRunner {
                 "at Thrower.main(Thrower.java:4)");
     }
 
+    @Test
+    public void testNoDuplicateIncubatorWarning(Path base) throws Exception {
+        Path module = base.resolve("lib");
+        Path moduleSrc = module.resolve("src");
+        Path moduleClasses = module.resolve("classes");
+        Files.createDirectories(moduleClasses);
+        tb.cleanDirectory(moduleClasses);
+        tb.writeJavaFiles(moduleSrc, "module test {}");
+        new JavacTask(tb)
+                .outdir(moduleClasses)
+                .files(tb.findJavaFiles(moduleSrc))
+                .run()
+                .writeAll();
+        markModuleAsIncubator(moduleClasses.resolve("module-info.class"));
+        tb.writeJavaFiles(base, "public class Main { public static void main(String... args) {}}");
+        String log = new JavaTask(tb)
+                .vmOptions("--module-path", moduleClasses.toString(),
+                           "--add-modules", "test")
+                .className(base.resolve("Main.java").toString())
+                .run(Task.Expect.SUCCESS)
+                .writeAll()
+                .getOutput(Task.OutputKind.STDERR);
+
+        int numberOfWarnings = log.split("WARNING").length - 1;
+
+        if (log.contains("warning:") || numberOfWarnings != 1) {
+            error("Unexpected warning in error output: " + log);
+        }
+
+        List<String> compileLog = new JavacTask(tb)
+                .options("--module-path", moduleClasses.toString(),
+                         "--add-modules", "test",
+                         "-XDrawDiagnostics",
+                         "-XDsourceLauncher",
+                         "-XDshould-stop.at=FLOW")
+                .files(base.resolve("Main.java").toString())
+                .run(Task.Expect.SUCCESS)
+                .writeAll()
+                .getOutputLines(Task.OutputKind.DIRECT);
+
+        List<String> expectedOutput = List.of(
+                "- compiler.warn.incubating.modules: test",
+                "1 warning"
+        );
+
+        if (!expectedOutput.equals(compileLog)) {
+            error("Unexpected options : " + compileLog);
+        }
+    }
+        //where:
+        private static void markModuleAsIncubator(Path moduleInfoFile) throws Exception {
+            ClassFile cf = ClassFile.read(moduleInfoFile);
+            List<CPInfo> newPool = new ArrayList<>();
+            newPool.add(null);
+            cf.constant_pool.entries().forEach(newPool::add);
+            int moduleResolutionIndex = newPool.size();
+            newPool.add(new ConstantPool.CONSTANT_Utf8_info(Attribute.ModuleResolution));
+            Map<String, Attribute> newAttributes = new HashMap<>(cf.attributes.map);
+            newAttributes.put(Attribute.ModuleResolution,
+                              new ModuleResolution_attribute(moduleResolutionIndex,
+                                                             ModuleResolution_attribute.WARN_INCUBATING));
+            ClassFile newClassFile = new ClassFile(cf.magic,
+                                                   cf.minor_version,
+                                                   cf.major_version,
+                                                   new ConstantPool(newPool.toArray(new CPInfo[0])),
+                                                   cf.access_flags,
+                                                   cf.this_class,
+                                                   cf.super_class,
+                                                   cf.interfaces,
+                                                   cf.fields,
+                                                   cf.methods,
+                                                   new Attributes(newAttributes));
+            try (OutputStream out = Files.newOutputStream(moduleInfoFile)) {
+                new ClassWriter().write(newClassFile, out);
+            }
+        }
+
     Result run(Path file, List<String> runtimeArgs, List<String> appArgs) {
         List<String> args = new ArrayList<>();
         args.add(file.toString());