8361401: Warnings for use of Sun APIs should not be mandatory

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

@@ -3759,7 +3759,7 @@ void checkDeprecated(Supplier<DiagnosticPosition> pos, final Symbol other, final
     void checkSunAPI(final DiagnosticPosition pos, final Symbol s) {
         if ((s.flags() & PROPRIETARY) != 0) {
             deferredLintHandler.report(_l -> {
-                log.mandatoryWarning(pos, Warnings.SunProprietary(s));
+                log.warning(pos, Warnings.SunProprietary(s));
             });
         }
     }

src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties

@@ -1969,6 +1969,7 @@ compiler.warn.has.been.deprecated.for.removal.module=\
     module {0} has been deprecated and marked for removal
 
 # 0: symbol
+# flags: strict
 compiler.warn.sun.proprietary=\
     {0} is internal proprietary API and may be removed in a future release
 

src/jdk.compiler/share/classes/com/sun/tools/javac/util/JCDiagnostic.java

@@ -458,7 +458,9 @@ public enum DiagnosticFlag {
         API,
         /** Flag for not-supported-in-source-X errors.
          */
-        SOURCE_LEVEL;
+        SOURCE_LEVEL,
+        /** Flag for warnings that cannot be disabled */
+        STRICT;
     }
 
     private final DiagnosticSource source;

src/jdk.compiler/share/classes/com/sun/tools/javac/util/Log.java

@@ -48,6 +48,7 @@
 import com.sun.tools.javac.main.Main;
 import com.sun.tools.javac.main.Option;
 import com.sun.tools.javac.tree.EndPosTable;
+import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticInfo;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
@@ -679,16 +680,6 @@ protected void directError(String key, Object... args) {
         errWriter.flush();
     }
 
-    /** Report a warning that cannot be suppressed.
-     *  @param pos    The source position at which to report the warning.
-     *  @param key    The key for the localized warning message.
-     *  @param args   Fields of the warning message.
-     */
-    public void strictWarning(DiagnosticPosition pos, String key, Object ... args) {
-        writeDiagnostic(diags.warning(null, source, pos, key, args));
-        nwarnings++;
-    }
-
     /**
      * Primary method to report a diagnostic.
      * @param diagnostic
@@ -797,7 +788,14 @@ public void report(JCDiagnostic diagnostic) {
                         return;
                 }
 
-                // Emit warning unless not mandatory and warnings are disabled
+                // Strict warnings are always emitted
+                if (diagnostic.isFlagSet(DiagnosticFlag.STRICT)) {
+                    writeDiagnostic(diagnostic);
+                    nwarnings++;
+                    return;
+                }
+
+                // Emit other warning unless not mandatory and warnings are disabled
                 if (emitWarnings || diagnostic.isMandatory()) {
                     if (nwarnings < MaxWarnings) {
                         writeDiagnostic(diagnostic);

test/langtools/tools/javac/options/system/SystemSunProprietary.java

@@ -41,13 +41,18 @@
 import toolbox.TestRunner;
 import toolbox.ToolBox;
 
+import javax.tools.Diagnostic;
+import javax.tools.Diagnostic.Kind;
+import javax.tools.DiagnosticListener;
+import javax.tools.JavaFileObject;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 
 public class SystemSunProprietary extends TestRunner {
 
@@ -110,28 +115,34 @@ private void expectNoSunapi(boolean ignoreSymbolFile, String... options) throws
 
     private void expectSunapi(boolean expectDiagnostic, boolean ignoreSymbolFile, String... options)
             throws IOException {
-        List<String> expected =
-                expectDiagnostic
-                        ? List.of(
-                                "Test.java:1:43: compiler.warn.sun.proprietary: sun.misc.Unsafe",
-                                "1 warning")
-                        : List.of("");
         List<String> allOptions = new ArrayList<>();
         allOptions.add("-XDrawDiagnostics");
         Collections.addAll(allOptions, options);
         JavacFileManager fm = new JavacFileManager(new Context(), false, null);
         fm.setSymbolFileEnabled(!ignoreSymbolFile);
-        List<String> log =
-                new JavacTask(tb)
-                        .fileManager(fm)
-                        .options(allOptions)
-                        .outdir(classes)
-                        .files(tb.findJavaFiles(src))
-                        .run(Expect.SUCCESS)
-                        .writeAll()
-                        .getOutputLines(Task.OutputKind.DIRECT);
-        if (!log.equals(expected)) {
-            throw new AssertionError("expected: " + expected + "\nactual: " + log + "\n");
+        new JavacTask(tb)
+                .fileManager(fm)
+                .options(allOptions)
+                .diagnosticListener(d -> sunAPIWarningChecker(d, expectDiagnostic))
+                .outdir(classes)
+                .files(tb.findJavaFiles(src))
+                .run(Expect.SUCCESS)
+                .writeAll();
+    }
+
+    void sunAPIWarningChecker(Diagnostic<?> diag, boolean expectDiagnostic) {
+        if (!expectDiagnostic) {
+            throw new AssertionError("Unexpected diagnostic: " + diag.getMessage(Locale.getDefault()));
+        } else {
+            if (diag.getKind() != Kind.WARNING) {
+                throw new AssertionError("Bad diagnostic kind. Expected " + Kind.WARNING + ", found: " + diag.getKind() + "\n");
+            }
+            if (!diag.getCode().equals("compiler.warn.sun.proprietary")) {
+                throw new AssertionError("Bad diagnostic code. Expected \"compiler.warn.sun.proprietary\", found: " + diag.getCode() + "\n");
+            }
+            if (diag.getLineNumber() != 1 || diag.getColumnNumber() != 43) {
+                throw new AssertionError("Bad diagnostic position. Expected 1:43, found: " + diag.getLineNumber() + ":" + diag.getColumnNumber() + "\n");
+            }
         }
     }
 

test/langtools/tools/lib/toolbox/JavacTask.java

@@ -37,6 +37,7 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import javax.annotation.processing.Processor;
+import javax.tools.DiagnosticListener;
 import javax.tools.JavaCompiler;
 import javax.tools.JavaFileManager;
 import javax.tools.JavaFileObject;
@@ -62,6 +63,7 @@ public class JavacTask extends AbstractTask<JavacTask> {
     private JavaFileManager fileManager;
     private Consumer<com.sun.source.util.JavacTask> callback;
     private List<Processor> procs;
+    private DiagnosticListener<? super JavaFileObject> diagnosticListener;
 
     private JavaCompiler compiler;
     private StandardJavaFileManager internalFileManager;
@@ -285,6 +287,14 @@ public JavacTask processors(Processor... procs) {
         return this;
     }
 
+    /**
+     * Sets the diagnostic listener to be used.
+     */
+    public JavacTask diagnosticListener(DiagnosticListener<? super JavaFileObject> diagnosticListener) {
+        this.diagnosticListener = diagnosticListener;
+        return this;
+    }
+
     /**
      * Sets the file manager to be used by this task.
      * @param fileManager the file manager
@@ -406,7 +416,7 @@ private int runAPI(PrintWriter pw) throws IOException {
             Iterable<? extends JavaFileObject> allFiles = joinFiles(files, fileObjects);
             JavaCompiler.CompilationTask task = compiler.getTask(pw,
                     fileManager,
-                    null,  // diagnostic listener; should optionally collect diags
+                    diagnosticListener,  // diagnostic listener; should optionally collect diags
                     allOpts,
                     classes,
                     allFiles);