Layoutlib Create: Find dependencies.

Usage: layoutlib_create --list-deps /path/to/layoutlib.jar

Prints:
- all classes found in the Jar and the types they use (the dependencies).
- all the dependencies missing from the Jar and what uses them.

Change-Id: I8b2674df127e1494feed7a653282e88e4d2f5494

4 files changed, 790 insertions, 52 deletions

diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java
index b197ea7..1549cf4 100644
--- a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java
@@ -45,7 +45,7 @@ import java.util.zip.ZipFile;
 public class AsmAnalyzer {
 
     // Note: a bunch of stuff has package-level access for unit tests. Consider it private.
-    
+
     /** Output logger. */
     private final Log mLog;
     /** The input source JAR to parse. */
@@ -59,11 +59,11 @@ public class AsmAnalyzer {
 
     /**
      * Creates a new analyzer.
-     * 
+     *
      * @param log The log output.
      * @param osJarPath The input source JARs to parse.
      * @param gen The generator to fill with the class list and dependency list.
-     * @param deriveFrom Keep all classes that derive from these one (these included). 
+     * @param deriveFrom Keep all classes that derive from these one (these included).
      * @param includeGlobs Glob patterns of classes to keep, e.g. "com.foo.*"
      *        ("*" does not matches dots whilst "**" does, "." and "$" are interpreted as-is)
      */
@@ -81,16 +81,13 @@ public class AsmAnalyzer {
      * Fills the generator with classes & dependencies found.
      */
     public void analyze() throws IOException, LogAbortException {
-
-        AsmAnalyzer visitor = this;
-        
         Map<String, ClassReader> zipClasses = parseZip(mOsSourceJar);
         mLog.info("Found %d classes in input JAR%s.", zipClasses.size(),
                 mOsSourceJar.size() > 1 ? "s" : "");
-        
+
         Map<String, ClassReader> found = findIncludes(zipClasses);
         Map<String, ClassReader> deps = findDeps(zipClasses, found);
-        
+
         if (mGen != null) {
             mGen.setKeep(found);
             mGen.setDeps(deps);
@@ -117,10 +114,10 @@ public class AsmAnalyzer {
                 }
             }
         }
-        
+
         return classes;
     }
-    
+
     /**
      * Utility that returns the fully qualified binary class name for a ClassReader.
      * E.g. it returns something like android.view.View.
@@ -132,7 +129,7 @@ public class AsmAnalyzer {
             return classReader.getClassName().replace('/', '.');
         }
     }
-    
+
     /**
      * Utility that returns the fully qualified binary class name from a path-like FQCN.
      * E.g. it returns android.view.View from android/view/View.
@@ -144,7 +141,7 @@ public class AsmAnalyzer {
             return className.replace('/', '.');
         }
     }
-    
+
     /**
      * Process the "includes" arrays.
      * <p/>
@@ -162,11 +159,11 @@ public class AsmAnalyzer {
         for (String s : mDeriveFrom) {
             findClassesDerivingFrom(s, zipClasses, found);
         }
-        
+
         return found;
     }
 
-    
+
     /**
      * Uses ASM to find the class reader for the given FQCN class name.
      * If found, insert it in the in_out_found map.
@@ -215,7 +212,7 @@ public class AsmAnalyzer {
         globPattern += "$";
 
         Pattern regexp = Pattern.compile(globPattern);
-        
+
         for (Entry<String, ClassReader> entry : zipClasses.entrySet()) {
             String class_name = entry.getKey();
             if (regexp.matcher(class_name).matches()) {
@@ -229,10 +226,9 @@ public class AsmAnalyzer {
      * determine if they are derived from the given FQCN super class name.
      * Inserts the super class and all the class objects found in the map.
      */
-    void findClassesDerivingFrom(String super_name, Map<String, ClassReader> zipClasses,
-            Map<String, ClassReader> inOutFound) throws LogAbortException {
-        ClassReader super_clazz = findClass(super_name, zipClasses, inOutFound);
-
+    void findClassesDerivingFrom(String super_name,
+            Map<String, ClassReader> zipClasses,
+            Map<String, ClassReader> inOutFound) {
         for (Entry<String, ClassReader> entry : zipClasses.entrySet()) {
             String className = entry.getKey();
             if (super_name.equals(className)) {
@@ -284,7 +280,7 @@ public class AsmAnalyzer {
         for (ClassReader cr : inOutKeepClasses.values()) {
             cr.accept(visitor, 0 /* flags */);
         }
-        
+
         while (new_deps.size() > 0 || new_keep.size() > 0) {
             deps.putAll(new_deps);
             inOutKeepClasses.putAll(new_keep);
@@ -308,12 +304,12 @@ public class AsmAnalyzer {
         return deps;
     }
 
-    
+
 
     // ----------------------------------
-    
+
     /**
-     * Visitor to collect all the type dependencies from a class. 
+     * Visitor to collect all the type dependencies from a class.
      */
     public class DependencyVisitor
         implements ClassVisitor, FieldVisitor, MethodVisitor, SignatureVisitor, AnnotationVisitor {
@@ -333,7 +329,7 @@ public class AsmAnalyzer {
          * Creates a new visitor that will find all the dependencies for the visited class.
          * Types which are already in the zipClasses, keepClasses or inDeps are not marked.
          * New dependencies are marked in outDeps.
-         * 
+         *
          * @param zipClasses All classes found in the source JAR.
          * @param inKeep Classes from which dependencies are to be found.
          * @param inDeps Dependencies already known.
@@ -350,7 +346,7 @@ public class AsmAnalyzer {
             mInDeps = inDeps;
             mOutDeps = outDeps;
         }
-        
+
         /**
          * Considers the given class name as a dependency.
          * If it does, add to the mOutDeps map.
@@ -361,7 +357,7 @@ public class AsmAnalyzer {
             }
 
             className = internalToBinaryClassName(className);
-            
+
             // exclude classes that have already been found
             if (mInKeep.containsKey(className) ||
                     mOutKeep.containsKey(className) ||
@@ -384,7 +380,7 @@ public class AsmAnalyzer {
             } catch (ClassNotFoundException e) {
                 // ignore
             }
-            
+
             // accept this class:
             // - android classes are added to dependencies
             // - non-android classes are added to the list of classes to keep as-is (they don't need
@@ -395,7 +391,7 @@ public class AsmAnalyzer {
                 mOutKeep.put(className, cr);
             }
         }
-        
+
         /**
          * Considers this array of names using considerName().
          */
@@ -450,7 +446,7 @@ public class AsmAnalyzer {
             }
         }
 
-        
+
         // ---------------------------------------------------
         // --- ClassVisitor, FieldVisitor
         // ---------------------------------------------------
@@ -460,7 +456,7 @@ public class AsmAnalyzer {
                 String signature, String superName, String[] interfaces) {
             // signature is the signature of this class. May be null if the class is not a generic
             // one, and does not extend or implement generic classes or interfaces.
-            
+
             if (signature != null) {
                 considerSignature(signature);
             }
@@ -468,7 +464,7 @@ public class AsmAnalyzer {
             // superName is the internal of name of the super class (see getInternalName).
             // For interfaces, the super class is Object. May be null but only for the Object class.
             considerName(superName);
-            
+
             // interfaces is the internal names of the class's interfaces (see getInternalName).
             // May be null.
             considerNames(interfaces);
@@ -513,7 +509,7 @@ public class AsmAnalyzer {
             // signature is the method's signature. May be null if the method parameters, return
             // type and exceptions do not use generic types.
             considerSignature(signature);
-            
+
             return this; // returns this to visit the method
         }
 
@@ -525,7 +521,7 @@ public class AsmAnalyzer {
             // pass
         }
 
-        
+
         // ---------------------------------------------------
         // --- MethodVisitor
         // ---------------------------------------------------
@@ -601,7 +597,7 @@ public class AsmAnalyzer {
 
         // instruction that invokes a method
         public void visitMethodInsn(int opcode, String owner, String name, String desc) {
-            
+
             // owner is the internal name of the method's owner class
             considerName(owner);
             // desc is the method's descriptor (see Type).
@@ -610,7 +606,7 @@ public class AsmAnalyzer {
 
         // instruction multianewarray, whatever that is
         public void visitMultiANewArrayInsn(String desc, int dims) {
-            
+
             // desc an array type descriptor.
             considerDesc(desc);
         }
@@ -624,7 +620,7 @@ public class AsmAnalyzer {
 
         public void visitTableSwitchInsn(int min, int max, Label dflt, Label[] labels) {
             // pass -- table switch instruction
-            
+
         }
 
         public void visitTryCatchBlock(Label start, Label end, Label handler, String type) {
@@ -641,10 +637,10 @@ public class AsmAnalyzer {
         }
 
         public void visitVarInsn(int opcode, int var) {
-            // pass -- local variable instruction 
+            // pass -- local variable instruction
         }
 
-        
+
         // ---------------------------------------------------
         // --- SignatureVisitor
         // ---------------------------------------------------
@@ -716,8 +712,8 @@ public class AsmAnalyzer {
         public void visitTypeArgument() {
             // pass
         }
-        
-        
+
+
         // ---------------------------------------------------
         // --- AnnotationVisitor
         // ---------------------------------------------------
@@ -746,6 +742,6 @@ public class AsmAnalyzer {
             // desc is the class descriptor of the enumeration class.
             considerDesc(desc);
         }
-        
+
     }
 }
diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/DependencyFinder.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/DependencyFinder.java
new file mode 100755
index 0000000..2956958
--- /dev/null
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/DependencyFinder.java
@@ -0,0 +1,694 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.tools.layoutlib.create;
+
+import com.android.tools.layoutlib.annotations.VisibleForTesting;
+import com.android.tools.layoutlib.annotations.VisibleForTesting.Visibility;
+
+import org.objectweb.asm.AnnotationVisitor;
+import org.objectweb.asm.Attribute;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.FieldVisitor;
+import org.objectweb.asm.Label;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Type;
+import org.objectweb.asm.signature.SignatureReader;
+import org.objectweb.asm.signature.SignatureVisitor;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.TreeSet;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+/**
+ * Analyzes the input JAR using the ASM java bytecode manipulation library
+ * to list the classes and their dependencies. A "dependency" is a class
+ * used by another class.
+ */
+public class DependencyFinder {
+
+    // Note: a bunch of stuff has package-level access for unit tests. Consider it private.
+
+    /** Output logger. */
+    private final Log mLog;
+
+    /**
+     * Creates a new analyzer.
+     *
+     * @param log The log output.
+     */
+    public DependencyFinder(Log log) {
+        mLog = log;
+    }
+
+    /**
+     * Starts the analysis using parameters from the constructor.
+     *
+     * @param osJarPath The input source JARs to parse.
+     * @return A pair: [0]: map { class FQCN => set of FQCN class dependencies }.
+     *                 [1]: map { missing class FQCN => set of FQCN class that uses it. }
+     */
+    public List<Map<String, Set<String>>> findDeps(List<String> osJarPath) throws IOException {
+
+        Map<String, ClassReader> zipClasses = parseZip(osJarPath);
+        mLog.info("Found %d classes in input JAR%s.",
+                zipClasses.size(),
+                osJarPath.size() > 1 ? "s" : "");
+
+        Map<String, Set<String>> deps = findClassesDeps(zipClasses);
+
+        Map<String, Set<String>> missing = findMissingClasses(deps, zipClasses.keySet());
+
+        List<Map<String, Set<String>>> result = new ArrayList<Map<String,Set<String>>>(2);
+        result.add(deps);
+        result.add(missing);
+        return result;
+    }
+
+    /**
+     * Prints dependencies to the current logger, found stuff and missing stuff.
+     */
+    public void printAllDeps(List<Map<String, Set<String>>> result) {
+        assert result.size() == 2;
+        Map<String, Set<String>> deps = result.get(0);
+        Map<String, Set<String>> missing = result.get(1);
+
+        // Print all dependences found in the format:
+        // +Found: <FQCN from zip>
+        //     uses: FQCN
+
+        mLog.info("++++++ %d Entries found in source JARs", deps.size());
+        mLog.info("");
+
+        for (Entry<String, Set<String>> entry : deps.entrySet()) {
+            mLog.info(    "+Found  : %s", entry.getKey());
+            for (String dep : entry.getValue()) {
+                mLog.info("    uses: %s", dep);
+            }
+
+            mLog.info("");
+        }
+
+
+        // Now print all missing dependences in the format:
+        // -Missing <FQCN>:
+        //     used by: <FQCN>
+
+        mLog.info("");
+        mLog.info("------ %d Entries missing from source JARs", missing.size());
+        mLog.info("");
+
+        for (Entry<String, Set<String>> entry : missing.entrySet()) {
+            mLog.info(    "-Missing  : %s", entry.getKey());
+            for (String dep : entry.getValue()) {
+                mLog.info("   used by: %s", dep);
+            }
+
+            mLog.info("");
+        }
+    }
+
+    /**
+     * Prints only a summary of the missing dependencies to the current logger.
+     */
+    public void printMissingDeps(List<Map<String, Set<String>>> result) {
+        assert result.size() == 2;
+        @SuppressWarnings("unused") Map<String, Set<String>> deps = result.get(0);
+        Map<String, Set<String>> missing = result.get(1);
+
+        for (String fqcn : missing.keySet()) {
+            mLog.info("%s", fqcn);
+        }
+    }
+
+    // ----------------
+
+    /**
+     * Parses a JAR file and returns a list of all classes founds using a map
+     * class name => ASM ClassReader. Class names are in the form "android.view.View".
+     */
+    Map<String,ClassReader> parseZip(List<String> jarPathList) throws IOException {
+        TreeMap<String, ClassReader> classes = new TreeMap<String, ClassReader>();
+
+        for (String jarPath : jarPathList) {
+            ZipFile zip = new ZipFile(jarPath);
+            Enumeration<? extends ZipEntry> entries = zip.entries();
+            ZipEntry entry;
+            while (entries.hasMoreElements()) {
+                entry = entries.nextElement();
+                if (entry.getName().endsWith(".class")) {
+                    ClassReader cr = new ClassReader(zip.getInputStream(entry));
+                    String className = classReaderToClassName(cr);
+                    classes.put(className, cr);
+                }
+            }
+        }
+
+        return classes;
+    }
+
+    /**
+     * Utility that returns the fully qualified binary class name for a ClassReader.
+     * E.g. it returns something like android.view.View.
+     */
+    static String classReaderToClassName(ClassReader classReader) {
+        if (classReader == null) {
+            return null;
+        } else {
+            return classReader.getClassName().replace('/', '.');
+        }
+    }
+
+    /**
+     * Utility that returns the fully qualified binary class name from a path-like FQCN.
+     * E.g. it returns android.view.View from android/view/View.
+     */
+    static String internalToBinaryClassName(String className) {
+        if (className == null) {
+            return null;
+        } else {
+            return className.replace('/', '.');
+        }
+    }
+
+    /**
+     * Finds all dependencies for all classes in keepClasses which are also
+     * listed in zipClasses. Returns a map of all the dependencies found.
+     */
+    Map<String, Set<String>> findClassesDeps(Map<String, ClassReader> zipClasses) {
+
+        // The dependencies that we'll collect.
+        // It's a map Class name => uses class names.
+        Map<String, Set<String>> dependencyMap = new TreeMap<String, Set<String>>();
+
+        DependencyVisitor visitor = getVisitor();
+
+        int count = 0;
+        try {
+            for (Entry<String, ClassReader> entry : zipClasses.entrySet()) {
+                String name = entry.getKey();
+
+                TreeSet<String> set = new TreeSet<String>();
+                dependencyMap.put(name, set);
+                visitor.setDependencySet(set);
+
+                ClassReader cr = entry.getValue();
+                cr.accept(visitor, 0 /* flags */);
+
+                visitor.setDependencySet(null);
+
+                mLog.debugNoln("Visited %d classes\r", ++count);
+            }
+        } finally {
+            mLog.debugNoln("\n");
+        }
+
+        return dependencyMap;
+    }
+
+    /**
+     * Computes which classes FQCN were found as dependencies that are NOT listed
+     * in the original JAR classes.
+     *
+     * @param deps The map { FQCN => dependencies[] } returned by {@link #findClassesDeps(Map)}.
+     * @param zipClasses The set of all classes FQCN found in the JAR files.
+     * @return A map { FQCN not found in the zipClasses => classes using it }
+     */
+    private Map<String, Set<String>> findMissingClasses(
+            Map<String, Set<String>> deps,
+            Set<String> zipClasses) {
+        Map<String, Set<String>> missing = new TreeMap<String, Set<String>>();
+
+        for (Entry<String, Set<String>> entry : deps.entrySet()) {
+            String name = entry.getKey();
+
+            for (String dep : entry.getValue()) {
+                if (!zipClasses.contains(dep)) {
+                    // This dependency doesn't exist in the zip classes.
+                    Set<String> set = missing.get(dep);
+                    if (set == null) {
+                        set = new TreeSet<String>();
+                        missing.put(dep, set);
+                    }
+                    set.add(name);
+                }
+            }
+
+        }
+
+        return missing;
+    }
+
+
+    // ----------------------------------
+
+    /**
+     * Instantiates a new DependencyVisitor. Useful for unit tests.
+     */
+    @VisibleForTesting(visibility=Visibility.PRIVATE)
+    DependencyVisitor getVisitor() {
+        return new DependencyVisitor();
+    }
+
+    /**
+     * Visitor to collect all the type dependencies from a class.
+     */
+    public class DependencyVisitor
+        implements ClassVisitor, FieldVisitor, MethodVisitor, SignatureVisitor, AnnotationVisitor {
+
+        private Set<String> mCurrentDepSet;
+
+        /**
+         * Creates a new visitor that will find all the dependencies for the visited class.
+         */
+        public DependencyVisitor() {
+        }
+
+        /**
+         * Sets the {@link Set} where to record direct dependencies for this class.
+         * This will change before each {@link ClassReader#accept(ClassVisitor, int)} call.
+         */
+        public void setDependencySet(Set<String> set) {
+            mCurrentDepSet = set;
+        }
+
+        /**
+         * Considers the given class name as a dependency.
+         */
+        public void considerName(String className) {
+            if (className == null) {
+                return;
+            }
+
+            className = internalToBinaryClassName(className);
+
+            try {
+                // exclude classes that are part of the default JRE (the one executing this program)
+                if (getClass().getClassLoader().loadClass(className) != null) {
+                    return;
+                }
+            } catch (ClassNotFoundException e) {
+                // ignore
+            }
+
+            // Add it to the dependency set for the currently visited class, as needed.
+            assert mCurrentDepSet != null;
+            if (mCurrentDepSet != null) {
+                mCurrentDepSet.add(className);
+            }
+        }
+
+        /**
+         * Considers this array of names using considerName().
+         */
+        public void considerNames(String[] classNames) {
+            if (classNames != null) {
+                for (String className : classNames) {
+                    considerName(className);
+                }
+            }
+        }
+
+        /**
+         * Considers this signature or type signature by invoking the {@link SignatureVisitor}
+         * on it.
+         */
+        public void considerSignature(String signature) {
+            if (signature != null) {
+                SignatureReader sr = new SignatureReader(signature);
+                // SignatureReader.accept will call accessType so we don't really have
+                // to differentiate where the signature comes from.
+                sr.accept(this);
+            }
+        }
+
+        /**
+         * Considers this {@link Type}. For arrays, the element type is considered.
+         * If the type is an object, it's internal name is considered.
+         */
+        public void considerType(Type t) {
+            if (t != null) {
+                if (t.getSort() == Type.ARRAY) {
+                    t = t.getElementType();
+                }
+                if (t.getSort() == Type.OBJECT) {
+                    considerName(t.getInternalName());
+                }
+            }
+        }
+
+        /**
+         * Considers a descriptor string. The descriptor is converted to a {@link Type}
+         * and then considerType() is invoked.
+         */
+        public boolean considerDesc(String desc) {
+            if (desc != null) {
+                try {
+                    if (desc.length() > 0 && desc.charAt(0) == '(') {
+                        // This is a method descriptor with arguments and a return type.
+                        Type t = Type.getReturnType(desc);
+                        considerType(t);
+
+                        for (Type arg : Type.getArgumentTypes(desc)) {
+                            considerType(arg);
+                        }
+
+                    } else {
+                        Type t = Type.getType(desc);
+                        considerType(t);
+                    }
+                    return true;
+                } catch (ArrayIndexOutOfBoundsException e) {
+                    // ignore, not a valid type.
+                }
+            }
+            return false;
+        }
+
+
+        // ---------------------------------------------------
+        // --- ClassVisitor, FieldVisitor
+        // ---------------------------------------------------
+
+        // Visits a class header
+        public void visit(int version, int access, String name,
+                String signature, String superName, String[] interfaces) {
+            // signature is the signature of this class. May be null if the class is not a generic
+            // one, and does not extend or implement generic classes or interfaces.
+
+            if (signature != null) {
+                considerSignature(signature);
+            }
+
+            // superName is the internal of name of the super class (see getInternalName).
+            // For interfaces, the super class is Object. May be null but only for the Object class.
+            considerName(superName);
+
+            // interfaces is the internal names of the class's interfaces (see getInternalName).
+            // May be null.
+            considerNames(interfaces);
+        }
+
+        public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
+            // desc is the class descriptor of the annotation class.
+            considerDesc(desc);
+            return this; // return this to visit annotion values
+        }
+
+        public void visitAttribute(Attribute attr) {
+            // pass
+        }
+
+        // Visits the end of a class
+        public void visitEnd() {
+            // pass
+        }
+
+        public FieldVisitor visitField(int access, String name, String desc,
+                String signature, Object value) {
+            // desc is the field's descriptor (see Type).
+            considerDesc(desc);
+
+            // signature is the field's signature. May be null if the field's type does not use
+            // generic types.
+            considerSignature(signature);
+
+            return this; // a visitor to visit field annotations and attributes
+        }
+
+        public void visitInnerClass(String name, String outerName, String innerName, int access) {
+            // name is the internal name of an inner class (see getInternalName).
+            // Note: outerName/innerName seems to be null when we're reading the
+            // _Original_ClassName classes generated by layoutlib_create.
+            if (outerName != null) {
+                considerName(name);
+            }
+        }
+
+        public MethodVisitor visitMethod(int access, String name, String desc,
+                String signature, String[] exceptions) {
+            // desc is the method's descriptor (see Type).
+            considerDesc(desc);
+            // signature is the method's signature. May be null if the method parameters, return
+            // type and exceptions do not use generic types.
+            considerSignature(signature);
+
+            return this; // returns this to visit the method
+        }
+
+        public void visitOuterClass(String owner, String name, String desc) {
+            // pass
+        }
+
+        public void visitSource(String source, String debug) {
+            // pass
+        }
+
+
+        // ---------------------------------------------------
+        // --- MethodVisitor
+        // ---------------------------------------------------
+
+        public AnnotationVisitor visitAnnotationDefault() {
+            return this; // returns this to visit the default value
+        }
+
+
+        public void visitCode() {
+            // pass
+        }
+
+        // field instruction
+        public void visitFieldInsn(int opcode, String owner, String name, String desc) {
+            // name is the field's name, not a type.
+            // desc is the field's descriptor (see Type).
+            considerDesc(desc);
+        }
+
+        public void visitFrame(int type, int local, Object[] local2, int stack, Object[] stack2) {
+            // pass
+        }
+
+        public void visitIincInsn(int var, int increment) {
+            // pass -- an IINC instruction
+        }
+
+        public void visitInsn(int opcode) {
+            // pass -- a zero operand instruction
+        }
+
+        public void visitIntInsn(int opcode, int operand) {
+            // pass -- a single int operand instruction
+        }
+
+        public void visitJumpInsn(int opcode, Label label) {
+            // pass -- a jump instruction
+        }
+
+        public void visitLabel(Label label) {
+            // pass -- a label target
+        }
+
+        // instruction to load a constant from the stack
+        public void visitLdcInsn(Object cst) {
+            if (cst instanceof Type) {
+                considerType((Type) cst);
+            }
+        }
+
+        public void visitLineNumber(int line, Label start) {
+            // pass
+        }
+
+        public void visitLocalVariable(String name, String desc,
+                String signature, Label start, Label end, int index) {
+            // desc is the type descriptor of this local variable.
+            considerDesc(desc);
+            // signature is the type signature of this local variable. May be null if the local
+            // variable type does not use generic types.
+            considerSignature(signature);
+        }
+
+        public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) {
+            // pass -- a lookup switch instruction
+        }
+
+        public void visitMaxs(int maxStack, int maxLocals) {
+            // pass
+        }
+
+        // instruction that invokes a method
+        public void visitMethodInsn(int opcode, String owner, String name, String desc) {
+
+            // owner is the internal name of the method's owner class
+            if (!considerDesc(owner) && owner.indexOf('/') != -1) {
+                considerName(owner);
+            }
+            // desc is the method's descriptor (see Type).
+            considerDesc(desc);
+        }
+
+        // instruction multianewarray, whatever that is
+        public void visitMultiANewArrayInsn(String desc, int dims) {
+
+            // desc an array type descriptor.
+            considerDesc(desc);
+        }
+
+        public AnnotationVisitor visitParameterAnnotation(int parameter, String desc,
+                boolean visible) {
+            // desc is the class descriptor of the annotation class.
+            considerDesc(desc);
+            return this; // return this to visit annotation values
+        }
+
+        public void visitTableSwitchInsn(int min, int max, Label dflt, Label[] labels) {
+            // pass -- table switch instruction
+
+        }
+
+        public void visitTryCatchBlock(Label start, Label end, Label handler, String type) {
+            // type is the internal name of the type of exceptions handled by the handler,
+            // or null to catch any exceptions (for "finally" blocks).
+            considerName(type);
+        }
+
+        // type instruction
+        public void visitTypeInsn(int opcode, String type) {
+            // type is the operand of the instruction to be visited. This operand must be the
+            // internal name of an object or array class.
+            if (!considerDesc(type) && type.indexOf('/') != -1) {
+                considerName(type);
+            }
+        }
+
+        public void visitVarInsn(int opcode, int var) {
+            // pass -- local variable instruction
+        }
+
+
+        // ---------------------------------------------------
+        // --- SignatureVisitor
+        // ---------------------------------------------------
+
+        private String mCurrentSignatureClass = null;
+
+        // Starts the visit of a signature corresponding to a class or interface type
+        public void visitClassType(String name) {
+            mCurrentSignatureClass = name;
+            considerName(name);
+        }
+
+        // Visits an inner class
+        public void visitInnerClassType(String name) {
+            if (mCurrentSignatureClass != null) {
+                mCurrentSignatureClass += "$" + name;
+                considerName(mCurrentSignatureClass);
+            }
+        }
+
+        public SignatureVisitor visitArrayType() {
+            return this; // returns this to visit the signature of the array element type
+        }
+
+        public void visitBaseType(char descriptor) {
+            // pass -- a primitive type, ignored
+        }
+
+        public SignatureVisitor visitClassBound() {
+            return this; // returns this to visit the signature of the class bound
+        }
+
+        public SignatureVisitor visitExceptionType() {
+            return this; // return this to visit the signature of the exception type.
+        }
+
+        public void visitFormalTypeParameter(String name) {
+            // pass
+        }
+
+        public SignatureVisitor visitInterface() {
+            return this; // returns this to visit the signature of the interface type
+        }
+
+        public SignatureVisitor visitInterfaceBound() {
+            return this; // returns this to visit the signature of the interface bound
+        }
+
+        public SignatureVisitor visitParameterType() {
+            return this; // returns this to visit the signature of the parameter type
+        }
+
+        public SignatureVisitor visitReturnType() {
+            return this; // returns this to visit the signature of the return type
+        }
+
+        public SignatureVisitor visitSuperclass() {
+            return this; // returns this to visit the signature of the super class type
+        }
+
+        public SignatureVisitor visitTypeArgument(char wildcard) {
+            return this; // returns this to visit the signature of the type argument
+        }
+
+        public void visitTypeVariable(String name) {
+            // pass
+        }
+
+        public void visitTypeArgument() {
+            // pass
+        }
+
+
+        // ---------------------------------------------------
+        // --- AnnotationVisitor
+        // ---------------------------------------------------
+
+
+        // Visits a primitive value of an annotation
+        public void visit(String name, Object value) {
+            // value is the actual value, whose type must be Byte, Boolean, Character, Short,
+            // Integer, Long, Float, Double, String or Type
+            if (value instanceof Type) {
+                considerType((Type) value);
+            }
+        }
+
+        public AnnotationVisitor visitAnnotation(String name, String desc) {
+            // desc is the class descriptor of the nested annotation class.
+            considerDesc(desc);
+            return this; // returns this to visit the actual nested annotation value
+        }
+
+        public AnnotationVisitor visitArray(String name) {
+            return this; // returns this to visit the actual array value elements
+        }
+
+        public void visitEnum(String name, String desc, String value) {
+            // desc is the class descriptor of the enumeration class.
+            considerDesc(desc);
+        }
+    }
+}
diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Log.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Log.java
index 8efd871..c3ba591 100644
--- a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Log.java
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Log.java
@@ -33,11 +33,19 @@ public class Log {
         }
     }
 
+    /** Similar to debug() but doesn't do a \n automatically. */
+    public void debugNoln(String format, Object... args) {
+        if (mVerbose) {
+            String s = String.format(format, args);
+            System.out.print(s);
+        }
+    }
+
     public void info(String format, Object... args) {
         String s = String.format(format, args);
         outPrintln(s);
     }
-    
+
     public void error(String format, Object... args) {
         String s = String.format(format, args);
         errPrintln(s);
@@ -50,15 +58,15 @@ public class Log {
         pw.flush();
         error(format + "\n" + sw.toString(), args);
     }
-    
+
     /** for unit testing */
     protected void errPrintln(String msg) {
         System.err.println(msg);
     }
-    
+
     /** for unit testing */
     protected void outPrintln(String msg) {
         System.out.println(msg);
     }
-    
+
 }
diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Main.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Main.java
index 4b7a348..9cd74db 100644
--- a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Main.java
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/Main.java
@@ -18,6 +18,8 @@ package com.android.tools.layoutlib.create;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 
@@ -47,6 +49,8 @@ public class Main {
 
     public static class Options {
         public boolean generatePublicAccess = true;
+        public boolean listAllDeps = false;
+        public boolean listOnlyMissingDeps = false;
     }
 
     public static final Options sOptions = new Options();
@@ -60,16 +64,29 @@ public class Main {
 
         if (!processArgs(log, args, osJarPath, osDestJar)) {
             log.error("Usage: layoutlib_create [-v] [-p] output.jar input.jar ...");
+            log.error("Usage: layoutlib_create [-v] [--list-deps|--missing-deps] input.jar ...");
             System.exit(1);
         }
 
-        log.info("Output: %1$s", osDestJar[0]);
+        if (sOptions.listAllDeps || sOptions.listOnlyMissingDeps) {
+            System.exit(listDeps(osJarPath, log));
+
+        } else {
+            System.exit(createLayoutLib(osDestJar[0], osJarPath, log));
+        }
+
+
+        System.exit(1);
+    }
+
+    private static int createLayoutLib(String osDestJar, ArrayList<String> osJarPath, Log log) {
+        log.info("Output: %1$s", osDestJar);
         for (String path : osJarPath) {
             log.info("Input :      %1$s", path);
         }
 
         try {
-            AsmGenerator agen = new AsmGenerator(log, osDestJar[0], new CreateInfo());
+            AsmGenerator agen = new AsmGenerator(log, osDestJar, new CreateInfo());
 
             AsmAnalyzer aa = new AsmAnalyzer(log, osJarPath, agen,
                     new String[] {                          // derived from
@@ -116,17 +133,33 @@ public class Main {
                 for (String path : osJarPath) {
                     log.info("- Input JAR : %1$s", path);
                 }
-                System.exit(1);
+                return 1;
             }
 
-            System.exit(0);
+            return 0;
         } catch (IOException e) {
             log.exception(e, "Failed to load jar");
         } catch (LogAbortException e) {
             e.error(log);
         }
 
-        System.exit(1);
+        return 1;
+    }
+
+    private static int listDeps(ArrayList<String> osJarPath, Log log) {
+        DependencyFinder df = new DependencyFinder(log);
+        try {
+            List<Map<String, Set<String>>> result = df.findDeps(osJarPath);
+            if (sOptions.listAllDeps) {
+                df.printAllDeps(result);
+            } else if (sOptions.listOnlyMissingDeps) {
+                df.printMissingDeps(result);
+            }
+        } catch (IOException e) {
+            log.exception(e, "Failed to load jar");
+        }
+
+        return 0;
     }
 
     /**
@@ -138,14 +171,21 @@ public class Main {
      */
     private static boolean processArgs(Log log, String[] args,
             ArrayList<String> osJarPath, String[] osDestJar) {
+        boolean needs_dest = true;
         for (int i = 0; i < args.length; i++) {
             String s = args[i];
             if (s.equals("-v")) {
                 log.setVerbose(true);
             } else if (s.equals("-p")) {
                 sOptions.generatePublicAccess = false;
+            } else if (s.equals("--list-deps")) {
+                sOptions.listAllDeps = true;
+                needs_dest = false;
+            } else if (s.equals("--missing-deps")) {
+                sOptions.listOnlyMissingDeps = true;
+                needs_dest = false;
             } else if (!s.startsWith("-")) {
-                if (osDestJar[0] == null) {
+                if (needs_dest && osDestJar[0] == null) {
                     osDestJar[0] = s;
                 } else {
                     osJarPath.add(s);
@@ -160,7 +200,7 @@ public class Main {
             log.error("Missing parameter: path to input jar");
             return false;
         }
-        if (osDestJar[0] == null) {
+        if (needs_dest && osDestJar[0] == null) {
             log.error("Missing parameter: path to output jar");
             return false;
         }