Merge "Replace more outputs to stdout/err by Diagnostics"
diff --git a/src/main/java/com/android/tools/r8/R8.java b/src/main/java/com/android/tools/r8/R8.java
index 5b28e78..c6fcc22 100644
--- a/src/main/java/com/android/tools/r8/R8.java
+++ b/src/main/java/com/android/tools/r8/R8.java
@@ -45,6 +45,7 @@
 import com.android.tools.r8.utils.CfgPrinter;
 import com.android.tools.r8.utils.FileUtils;
 import com.android.tools.r8.utils.InternalOptions;
+import com.android.tools.r8.utils.StringDiagnostic;
 import com.android.tools.r8.utils.ThreadUtils;
 import com.android.tools.r8.utils.Timing;
 import com.google.common.io.ByteStreams;
@@ -206,11 +207,11 @@
         missingClasses = filterMissingClasses(
             missingClasses, options.proguardConfiguration.getDontWarnPatterns());
         if (!missingClasses.isEmpty()) {
-          System.err.println();
-          System.err.println("WARNING, some classes are missing:");
-          missingClasses.forEach(clazz -> {
-            System.err.println(" - " + clazz.toSourceString());
-          });
+          missingClasses.forEach(
+              clazz -> {
+                options.diagnosticsHandler.warning(
+                    new StringDiagnostic("Missing class: " + clazz.toSourceString()));
+              });
           if (!options.ignoreMissingClasses) {
             throw new CompilationError(
                 "Shrinking can't be performed because some library classes are missing.");
diff --git a/src/main/java/com/android/tools/r8/dex/ApplicationWriter.java b/src/main/java/com/android/tools/r8/dex/ApplicationWriter.java
index 752c66b..61e1022 100644
--- a/src/main/java/com/android/tools/r8/dex/ApplicationWriter.java
+++ b/src/main/java/com/android/tools/r8/dex/ApplicationWriter.java
@@ -144,9 +144,9 @@
       } else if (!options.canUseMultidex()
           && options.mainDexKeepRules.isEmpty()
           && application.mainDexList.isEmpty()) {
-        distributor = new VirtualFile.MonoDexDistributor(this);
+        distributor = new VirtualFile.MonoDexDistributor(this, options);
       } else {
-        distributor = new VirtualFile.FillFilesDistributor(this, options.minimalMainDex);
+        distributor = new VirtualFile.FillFilesDistributor(this, options);
       }
       Map<Integer, VirtualFile> newFiles = distributor.run();
 
diff --git a/src/main/java/com/android/tools/r8/dex/VirtualFile.java b/src/main/java/com/android/tools/r8/dex/VirtualFile.java
index eeb5023..34ec68c 100644
--- a/src/main/java/com/android/tools/r8/dex/VirtualFile.java
+++ b/src/main/java/com/android/tools/r8/dex/VirtualFile.java
@@ -23,6 +23,8 @@
 import com.android.tools.r8.naming.NamingLens;
 import com.android.tools.r8.utils.DescriptorUtils;
 import com.android.tools.r8.utils.FileUtils;
+import com.android.tools.r8.utils.InternalOptions;
+import com.android.tools.r8.utils.StringDiagnostic;
 import com.google.common.collect.Iterators;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
@@ -267,9 +269,11 @@
     protected Set<DexProgramClass> classes;
     protected Map<DexProgramClass, String> originalNames;
     protected final VirtualFile mainDexFile;
+    protected final InternalOptions options;
 
-    DistributorBase(ApplicationWriter writer) {
+    DistributorBase(ApplicationWriter writer, InternalOptions options) {
       super(writer);
+      this.options = options;
 
       // Create the primary dex file. The distribution will add more if needed.
       mainDexFile = new VirtualFile(0, writer.namingLens);
@@ -293,10 +297,11 @@
             mainDexFile.addClass(programClass);
             classes.remove(programClass);
           } else {
-            System.out.println(
-                "WARNING: Application does not contain `"
-                    + type.toSourceString()
-                    + "` as referenced in main-dex-list.");
+            options.diagnosticsHandler.warning(
+                new StringDiagnostic(
+                    "Application does not contain `"
+                        + type.toSourceString()
+                        + "` as referenced in main-dex-list."));
           }
           mainDexFile.commitTransaction();
         }
@@ -338,12 +343,10 @@
   }
 
   public static class FillFilesDistributor extends DistributorBase {
-    boolean minimalMainDex;
     private final FillStrategy fillStrategy;
 
-    FillFilesDistributor(ApplicationWriter writer, boolean minimalMainDex) {
-      super(writer);
-      this.minimalMainDex = minimalMainDex;
+    FillFilesDistributor(ApplicationWriter writer, InternalOptions options) {
+      super(writer, options);
       this.fillStrategy = FillStrategy.FILL_MAX;
     }
 
@@ -357,7 +360,7 @@
       }
 
       Map<Integer, VirtualFile> filesForDistribution = nameToFileMap;
-      if (minimalMainDex && !mainDexFile.isEmpty()) {
+      if (options.minimalMainDex && !mainDexFile.isEmpty()) {
         assert !nameToFileMap.get(0).isEmpty();
         // The main dex file is filtered out, so create ensure at least one file for the remaining
         // classes
@@ -378,8 +381,8 @@
   }
 
   public static class MonoDexDistributor extends DistributorBase {
-    MonoDexDistributor(ApplicationWriter writer) {
-      super(writer);
+    MonoDexDistributor(ApplicationWriter writer, InternalOptions options) {
+      super(writer, options);
     }
 
     @Override