1 files changed, 137 insertions, 113 deletions

diff --git a/java/org/gnu/emacs/EmacsNoninteractive.java b/java/org/gnu/emacs/EmacsNoninteractive.java
index ba23399cb3e..9f2b9fa8b56 100644
--- a/java/org/gnu/emacs/EmacsNoninteractive.java
+++ b/java/org/gnu/emacs/EmacsNoninteractive.java
@@ -30,37 +30,69 @@ import java.lang.reflect.Method;
 
 /* Noninteractive Emacs.
 
-   This is the class that libandroid-emacs.so starts.
-   libandroid-emacs.so figures out the system classpath, then starts
-   dalvikvm with the framework jars.
-
-   At that point, dalvikvm calls main, which sets up the main looper,
-   creates an ActivityThread and attaches it to the main thread.
-
-   Then, it obtains an application context for the LoadedApk in the
-   application thread.
-
-   Finally, it obtains the necessary context specific objects and
-   initializes Emacs.  */
+   When started, libandroid-emacs.so invokes `app_process(64)' with a
+   command line placing Emacs's classes.dex file in the JVM class path,
+   which in turn transfers control to `main'.  `main' creates a context,
+   which may be likened to a connection to the system server, and a
+   class loader derived from Emacs's application package, which it loads
+   beforehand.  From this class loader, it loads another instance of
+   itself, and invokes `main1', to ensure the execution of
+   `EmacsNative''s static initializer within the application class
+   loader, where a proper library search path is in effect.  */
 
 @SuppressWarnings ("unchecked")
 public final class EmacsNoninteractive
 {
+  /* Prepare Emacs for startup and call `initEmacs'.  This function is
+     called in an instance of `EmacsNoninteractive' loaded by the APK
+     ClassLoader acquired in `main', which guarantees that shared
+     libraries in the APK will be considered in resolving shared
+     libraries for `EmacsNative'.  */
+
+  public static void
+  main1 (String[] args, Context context)
+    throws Exception
+  {
+    AssetManager assets;
+    String filesDir, libDir, cacheDir;
+
+    /* Don't actually start the looper or anything.  Instead, obtain
+       an AssetManager.  */
+    assets = context.getAssets ();
+
+    /* Now configure Emacs.  The class path should already be set.  */
+
+    filesDir = context.getFilesDir ().getCanonicalPath ();
+    libDir = EmacsService.getLibraryDirectory (context);
+    cacheDir = context.getCacheDir ().getCanonicalPath ();
+    EmacsNative.setEmacsParams (assets, filesDir,
+				libDir, cacheDir, 0.0f,
+				0.0f, 0.0f, null, null,
+				Build.VERSION.SDK_INT);
+
+    /* Now find the dump file that Emacs should use, if it has already
+       been dumped.  */
+    EmacsApplication.findDumpFile (context);
+
+    /* Start Emacs.  */
+    EmacsNative.initEmacs (args, EmacsApplication.dumpFileName);
+  }
+
   public static void
   main (String[] args)
   {
     Object activityThread, loadedApk;
     Class activityThreadClass, loadedApkClass, contextImplClass;
-    Class compatibilityInfoClass;
+    Class compatibilityInfoClass, emacsNoninteractiveClass;
     Method method;
     Context context;
-    AssetManager assets;
-    String filesDir, libDir, cacheDir;
+    ClassLoader classLoader;
 
     Looper.prepare ();
+
     context = null;
-    assets = null;
-    filesDir = libDir = cacheDir = null;
+    loadedApkClass = null;
+    classLoader = null;
 
     try
       {
@@ -72,7 +104,6 @@ public final class EmacsNoninteractive
 
 	/* Create and attach the activity thread.  */
 	activityThread = method.invoke (null);
-	context = null;
 
 	/* Now get an LoadedApk.  */
 
@@ -82,99 +113,88 @@ public final class EmacsNoninteractive
 	  }
 	catch (ClassNotFoundException exception)
 	  {
-	    /* Android 2.2 has no LoadedApk class, but fortunately it
-	       does not need to be used, since contexts can be
-	       directly created.  */
+	    /* Android 2.2 has no LoadedApk class; the several following
+	       statements will load a context and an
+	       ActivityThread.PackageInfo, as is appropriate on this
+	       system.  */
+	  }
 
-	    loadedApkClass = null;
-	    contextImplClass = Class.forName ("android.app.ContextImpl");
+	/* Get a LoadedApk or ActivityThread.PackageInfo.  How to do
+	   this varies by Android version.  On Android 2.3.3 and
+	   earlier, there is no ``compatibilityInfo'' argument to
+	   getPackageInfo.  */
 
-	    method = activityThreadClass.getDeclaredMethod ("getSystemContext");
-	    context = (Context) method.invoke (activityThread);
-	    method = contextImplClass.getDeclaredMethod ("createPackageContext",
-							 String.class,
-							 int.class);
-	    method.setAccessible (true);
-	    context = (Context) method.invoke (context, "org.gnu.emacs",
-					       0);
+	if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1)
+	  {
+	    method
+	      = activityThreadClass.getMethod ("getPackageInfo",
+					       String.class,
+					       int.class);
+	    loadedApk = method.invoke (activityThread, "org.gnu.emacs",
+				       (Context.CONTEXT_INCLUDE_CODE
+					| Context.CONTEXT_IGNORE_SECURITY));
 	  }
+	else
+	  {
+	    compatibilityInfoClass
+	      = Class.forName ("android.content.res.CompatibilityInfo");
+
+	    method
+	      = activityThreadClass.getMethod ("getPackageInfo",
+					       String.class,
+					       compatibilityInfoClass,
+					       int.class);
+	    loadedApk = method.invoke (activityThread, "org.gnu.emacs",
+				       null, (Context.CONTEXT_INCLUDE_CODE
+					      | Context.CONTEXT_IGNORE_SECURITY));
+	  }
+
+	if (loadedApk == null)
+	  throw new RuntimeException ("getPackageInfo returned NULL");
+
+	/* If loadedApkClass remains NULL, substitute the class of
+	   the object returned by getPackageInfo.  */
+	if (loadedApkClass == null)
+	  loadedApkClass = loadedApk.getClass ();
 
-	/* If the context has not already been created, then do what
-	   is appropriate for newer versions of Android.  */
+	/* Now, get a context.  */
+	contextImplClass = Class.forName ("android.app.ContextImpl");
 
-	if (context == null)
+	try
 	  {
-	    /* Get a LoadedApk.  How to do this varies by Android version.
-	       On Android 2.3.3 and earlier, there is no
-	       ``compatibilityInfo'' argument to getPackageInfo.  */
-
-	    if (Build.VERSION.SDK_INT
-		<= Build.VERSION_CODES.GINGERBREAD_MR1)
-	      {
-		method
-		  = activityThreadClass.getMethod ("getPackageInfo",
-						   String.class,
-						   int.class);
-		loadedApk = method.invoke (activityThread, "org.gnu.emacs",
-					   0);
-	      }
-	    else
-	      {
-		compatibilityInfoClass
-		  = Class.forName ("android.content.res.CompatibilityInfo");
-
-		method
-		  = activityThreadClass.getMethod ("getPackageInfo",
-						   String.class,
-						   compatibilityInfoClass,
-						   int.class);
-		loadedApk = method.invoke (activityThread, "org.gnu.emacs",
-					   null, 0);
-	      }
-
-	    if (loadedApk == null)
-	      throw new RuntimeException ("getPackageInfo returned NULL");
-
-	    /* Now, get a context.  */
-	    contextImplClass = Class.forName ("android.app.ContextImpl");
-
-	    try
-	      {
-		method
-		  = contextImplClass.getDeclaredMethod ("createAppContext",
-							activityThreadClass,
-							loadedApkClass);
-		method.setAccessible (true);
-		context = (Context) method.invoke (null, activityThread,
-						   loadedApk);
-	      }
-	    catch (NoSuchMethodException exception)
-	      {
-		/* Older Android versions don't have createAppContext, but
-		   instead require creating a ContextImpl, and then
-		   calling createPackageContext.  */
-		method
-		  = activityThreadClass.getDeclaredMethod ("getSystemContext");
-		context = (Context) method.invoke (activityThread);
-		method
-		  = contextImplClass.getDeclaredMethod ("createPackageContext",
-							String.class,
-							int.class);
-		method.setAccessible (true);
-		context = (Context) method.invoke (context, "org.gnu.emacs",
-						   0);
-	      }
+	    method
+	      = contextImplClass.getDeclaredMethod ("createAppContext",
+						    activityThreadClass,
+						    loadedApkClass);
+	    method.setAccessible (true);
+	    context = (Context) method.invoke (null, activityThread,
+					       loadedApk);
+	  }
+	catch (NoSuchMethodException exception)
+	  {
+	    /* Older Android versions don't have createAppContext, but
+	       instead require creating a ContextImpl, and then
+	       calling createPackageContext.  */
+	    method
+	      = activityThreadClass.getDeclaredMethod ("getSystemContext");
+	    context = (Context) method.invoke (activityThread);
+	    method
+	      = contextImplClass.getDeclaredMethod ("createPackageContext",
+						    String.class,
+						    int.class);
+	    method.setAccessible (true);
+	    context = (Context) method.invoke (context, "org.gnu.emacs",
+					       0);
 	  }
 
-	/* Don't actually start the looper or anything.  Instead, obtain
-	   an AssetManager.  */
-	assets = context.getAssets ();
-
-	/* Now configure Emacs.  The class path should already be set.  */
+	/* Retrieve the LoadedApk's class loader and execute the
+	   remaining portion of the start-up process within its version
+	   of EmacsNoninteractive, which will indicate to the system
+	   that it must load shared libraries from the APK's library
+	   search path.  */
 
-	filesDir = context.getFilesDir ().getCanonicalPath ();
-	libDir = EmacsService.getLibraryDirectory (context);
-	cacheDir = context.getCacheDir ().getCanonicalPath ();
+	method = loadedApkClass.getDeclaredMethod ("getClassLoader");
+	classLoader = (ClassLoader) method.invoke (loadedApk);
       }
     catch (Exception e)
       {
@@ -188,16 +208,20 @@ public final class EmacsNoninteractive
 	System.exit (1);
       }
 
-    EmacsNative.setEmacsParams (assets, filesDir,
-				libDir, cacheDir, 0.0f,
-				0.0f, 0.0f, null, null,
-				Build.VERSION.SDK_INT);
-
-    /* Now find the dump file that Emacs should use, if it has already
-       been dumped.  */
-    EmacsApplication.findDumpFile (context);
-
-    /* Start Emacs.  */
-    EmacsNative.initEmacs (args, EmacsApplication.dumpFileName);
+    try
+      {
+	emacsNoninteractiveClass
+	  = classLoader.loadClass ("org.gnu.emacs.EmacsNoninteractive");
+	method = emacsNoninteractiveClass.getMethod ("main1", String[].class,
+						     Context.class);
+	method.setAccessible (true);
+	method.invoke (null, args, context);
+      }
+    catch (Exception e)
+      {
+	System.err.println ("Internal error during startup: " + e);
+	e.printStackTrace ();
+	System.exit (1);
+      }
   }
 };