Fix code size for FileChannel

Change-Id: I63697f083fde05b0577d797450946c41f3882ac4
diff --git a/src/test/java/com/android/tools/r8/L8TestBuilder.java b/src/test/java/com/android/tools/r8/L8TestBuilder.java
index 2a1d0f5..190e87b 100644
--- a/src/test/java/com/android/tools/r8/L8TestBuilder.java
+++ b/src/test/java/com/android/tools/r8/L8TestBuilder.java
@@ -191,7 +191,7 @@
           ImmutableList.<String>builder()
               .addAll(keepRules)
               .addAll(
-                  generatedKeepRules != null
+                  generatedKeepRules != null && !generatedKeepRules.isEmpty()
                       ? ImmutableList.of(generatedKeepRules)
                       : Collections.emptyList())
               .build();
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/DesugaredLibraryWarningTest.java b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/DesugaredLibraryWarningTest.java
index 40942f7..116b62a 100644
--- a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/DesugaredLibraryWarningTest.java
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/DesugaredLibraryWarningTest.java
@@ -14,8 +14,10 @@
 import com.android.tools.r8.TestParameters;
 import com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification;
 import com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification;
+import com.android.tools.r8.errors.UnusedProguardKeepRuleDiagnostic;
 import com.google.common.collect.ImmutableList;
 import java.util.List;
+import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -95,7 +97,11 @@
               } else {
                 diagnosticsHandler.assertNoWarnings();
               }
-              diagnosticsHandler.assertNoInfos();
+              // The L8 compilation has always the extra keep rules from the json files, which may
+              // be unused, leading to infos.
+              Assert.assertTrue(
+                  diagnosticsHandler.getInfos().stream()
+                      .allMatch(info -> info instanceof UnusedProguardKeepRuleDiagnostic));
             });
   }
 }
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/NoDesugaredLibraryDexFileTest.java b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/NoDesugaredLibraryDexFileTest.java
index 0cf1b01..9cd3753 100644
--- a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/NoDesugaredLibraryDexFileTest.java
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/NoDesugaredLibraryDexFileTest.java
@@ -19,7 +19,6 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.SortedSet;
-import org.junit.Assert;
 import org.junit.Assume;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -58,7 +57,7 @@
         .addKeepClassAndMembersRules(Executor.class)
         .compile()
         .inspect(this::assertNoForwardingStreamMethod)
-        .inspectKeepRules(Assert::assertNull)
+        .inspectKeepRules(kr -> assertTrue(kr == null || kr.isEmpty()))
         .run(parameters.getRuntime(), Executor.class)
         .assertSuccessWithOutputLines("1", "0");
   }
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/ProgramRewritingTest.java b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/ProgramRewritingTest.java
index 5e6c723..2faea77 100644
--- a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/ProgramRewritingTest.java
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/ProgramRewritingTest.java
@@ -109,7 +109,7 @@
                   if (parameters.getApiLevel().getLevel() < AndroidApiLevel.N.getLevel()) {
                     keepRules.set(String.join("\n", kr));
                   } else {
-                    assert kr == null;
+                    assert kr == null || kr.isEmpty();
                     keepRules.set("");
                   }
                 })
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/jdk11/FileChannelSizeTest.java b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/jdk11/FileChannelSizeTest.java
new file mode 100644
index 0000000..651f108
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/jdk11/FileChannelSizeTest.java
@@ -0,0 +1,109 @@
+// Copyright (c) 2023, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package com.android.tools.r8.desugar.desugaredlibrary.jdk11;
+
+import static com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification.DEFAULT_SPECIFICATIONS;
+import static com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification.JDK11_PATH;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.ToolHelper.DexVm.Version;
+import com.android.tools.r8.desugar.desugaredlibrary.DesugaredLibraryTestBase;
+import com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification;
+import com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification;
+import com.android.tools.r8.utils.AndroidApiLevel;
+import com.android.tools.r8.utils.StringUtils;
+import com.google.common.collect.ImmutableList;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.List;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class FileChannelSizeTest extends DesugaredLibraryTestBase {
+
+  private static final String EXPECTED_RESULT =
+      StringUtils.lines("class java.io.FileNotFoundException");
+  private static final String EXPECTED_KEEP_RULES =
+      StringUtils.lines(
+          "-keep class j$.nio.channels.DesugarChannels {",
+          "    java.nio.channels.FileChannel"
+              + " convertMaybeLegacyFileChannelFromLibrary(java.nio.channels.FileChannel);",
+          "}");
+
+  private final TestParameters parameters;
+  private final LibraryDesugaringSpecification libraryDesugaringSpecification;
+  private final CompilationSpecification compilationSpecification;
+
+  @Parameters(name = "{0}, spec: {1}, {2}")
+  public static List<Object[]> data() {
+    return buildParameters(
+        // Skip Android 4.4.4 due to missing libjavacrypto.
+        getTestParameters()
+            .withDexRuntime(Version.V4_0_4)
+            .withDexRuntimesStartingFromIncluding(Version.V5_1_1)
+            .withAllApiLevels()
+            .build(),
+        ImmutableList.of(JDK11_PATH),
+        DEFAULT_SPECIFICATIONS);
+  }
+
+  public FileChannelSizeTest(
+      TestParameters parameters,
+      LibraryDesugaringSpecification libraryDesugaringSpecification,
+      CompilationSpecification compilationSpecification) {
+    this.parameters = parameters;
+    this.libraryDesugaringSpecification = libraryDesugaringSpecification;
+    this.compilationSpecification = compilationSpecification;
+  }
+
+  @Test
+  public void test() throws Throwable {
+    testForDesugaredLibrary(parameters, libraryDesugaringSpecification, compilationSpecification)
+        .addInnerClasses(getClass())
+        .addKeepMainRule(TestClass.class)
+        .compile()
+        .inspectKeepRules(
+            kr -> {
+              if (parameters.getApiLevel().isLessThan(AndroidApiLevel.N)) {
+                assertEquals(EXPECTED_KEEP_RULES, kr.get(0));
+              }
+            })
+        .inspectL8(
+            i -> {
+              if (compilationSpecification.isL8Shrink()) {
+                assertTrue(i.allClasses().size() <= 6);
+                if (parameters.getApiLevel().isGreaterThanOrEqualTo(AndroidApiLevel.N)) {
+                  assertEquals(0, i.allClasses().size());
+                }
+              }
+            })
+        .withArt6Plus64BitsLib()
+        .run(parameters.getRuntime(), TestClass.class)
+        .assertSuccessWithOutput(EXPECTED_RESULT);
+  }
+
+  public static class TestClass {
+
+    public static void main(String[] args) throws IOException {
+      try {
+        String toWrite = "Hello World! ";
+        ByteBuffer byteBuffer = ByteBuffer.allocate(toWrite.length());
+        FileInputStream fileInputStream = new FileInputStream(new File("notexisting.txt"));
+        fileInputStream.getChannel().read(byteBuffer);
+        fileInputStream.close();
+        System.out.println(new String(byteBuffer.array()));
+      } catch (IOException e) {
+        System.out.println(e.getClass());
+      }
+    }
+  }
+}
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/test/LibraryDesugaringSpecification.java b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/test/LibraryDesugaringSpecification.java
index 3d76b78..42ade2a 100644
--- a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/test/LibraryDesugaringSpecification.java
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/test/LibraryDesugaringSpecification.java
@@ -269,10 +269,10 @@
         .applyIf(
             l8Shrink,
             builder -> {
-              if (keepRule != null && !keepRule.trim().isEmpty()) {
-                String totalKeepRules = keepRule + "\n" + getExtraKeepRules();
-                builder.addGeneratedKeepRules(totalKeepRules);
-              }
+              assert keepRule != null;
+              String totalKeepRules =
+                  keepRule + (getExtraKeepRules().isEmpty() ? "" : ("\n" + getExtraKeepRules()));
+              builder.addGeneratedKeepRules(totalKeepRules);
             },
             L8TestBuilder::setDebug);
   }
diff --git a/third_party/openjdk/desugar_jdk_libs_11.tar.gz.sha1 b/third_party/openjdk/desugar_jdk_libs_11.tar.gz.sha1
index d52bbc5..247f833 100644
--- a/third_party/openjdk/desugar_jdk_libs_11.tar.gz.sha1
+++ b/third_party/openjdk/desugar_jdk_libs_11.tar.gz.sha1
@@ -1 +1,2 @@
-024c0b5aa78dba1442189dc55367551825cc4085
\ No newline at end of file
+aa4b6c72e66addc2d7453eedc62a6d810994af6d
+