diff --git a/classpath/java-io.cpp b/classpath/java-io.cpp
index 481032209a..acb61554f4 100644
--- a/classpath/java-io.cpp
+++ b/classpath/java-io.cpp
@@ -14,12 +14,14 @@
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <dirent.h>
 
 #include "jni.h"
 #include "jni-util.h"
 
 #ifdef WIN32
+#  include <windows.h>
 #  include <io.h>
 
 #  define OPEN _open
@@ -34,6 +36,7 @@
 #  define OPEN_MASK O_BINARY
 #else
 #  include <unistd.h>
+#  include "sys/mman.h"
 
 #  define OPEN open
 #  define CLOSE close
@@ -47,6 +50,8 @@
 #  define OPEN_MASK 0
 #endif
 
+inline void* operator new(size_t, void* p) throw() { return p; }
+
 namespace {
 
 inline bool
@@ -95,9 +100,118 @@ doWrite(JNIEnv* e, jint fd, const jbyte* data, jint length)
   int r = WRITE(fd, data, length);
   if (r != length) {
     throwNew(e, "java/io/IOException", strerror(errno));
-  }  
+  }
 }
 
+#ifdef WIN32
+
+class Mapping {
+ public:
+  Mapping(uint8_t* start, size_t length, HANDLE mapping, HANDLE file):
+    start(start),
+    length(length),
+    mapping(mapping),
+    file(file)
+  { }
+
+  uint8_t* start;
+  size_t length;
+  HANDLE mapping;
+  HANDLE file;
+};
+
+inline Mapping*
+map(JNIEnv* e, const char* path)
+{
+  Mapping* result = 0;
+  HANDLE file = CreateFile(path, FILE_READ_DATA, FILE_SHARE_READ, 0,
+                           OPEN_EXISTING, 0, 0);
+  if (file != INVALID_HANDLE_VALUE) {
+    unsigned size = GetFileSize(file, 0);
+    if (size != INVALID_FILE_SIZE) {
+      HANDLE mapping = CreateFileMapping(file, 0, PAGE_READONLY, 0, size, 0);
+      if (mapping) {
+        void* data = MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, 0);
+        if (data) {
+          void* p = allocate(e, sizeof(Mapping));
+          if (not e->ExceptionOccurred()) {
+            result = new (p)
+              Mapping(static_cast<uint8_t*>(data), size, file, mapping);
+          }   
+        }
+
+        if (result == 0) {
+          CloseHandle(mapping);
+        }
+      }
+    }
+
+    if (result == 0) {
+      CloseHandle(file);
+    }
+  }
+  if (result == 0 and not e->ExceptionOccurred()) {
+    throwNew(e, "java/io/IOException", "%d", GetLastError());
+  }
+  return result;
+}
+
+inline void
+unmap(JNIEnv*, Mapping* mapping)
+{
+  UnmapViewOfFile(mapping->start);
+  CloseHandle(mapping->mapping);
+  CloseHandle(mapping->file);
+  free(mapping);
+}
+
+#else // not WIN32
+
+class Mapping {
+ public:
+  Mapping(uint8_t* start, size_t length):
+    start(start),
+    length(length)
+  { }
+
+  uint8_t* start;
+  size_t length;
+};
+
+inline Mapping*
+map(JNIEnv* e, const char* path)
+{
+  Mapping* result = 0;
+  int fd = open(path, O_RDONLY);
+  if (fd != -1) {
+    struct stat s;
+    int r = fstat(fd, &s);
+    if (r != -1) {
+      void* data = mmap(0, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+      if (data) {
+        void* p = allocate(e, sizeof(Mapping));
+        if (not e->ExceptionOccurred()) {
+          result = new (p) Mapping(static_cast<uint8_t*>(data), s.st_size);
+        }
+      }
+    }
+    close(fd);
+  }
+  if (result == 0 and not e->ExceptionOccurred()) {
+    throwNew(e, "java/io/IOException", strerror(errno));
+  }
+  return result;
+}
+
+inline void
+unmap(JNIEnv*, Mapping* mapping)
+{
+  munmap(mapping->start, mapping->length);
+  free(mapping);
+}
+
+#endif // not WIN32
+
 } // namespace
 
 extern "C" JNIEXPORT jstring JNICALL
@@ -333,3 +447,42 @@ Java_java_io_FileOutputStream_close(JNIEnv* e, jclass, jint fd)
 {
   doClose(e, fd);
 }
+
+extern "C" JNIEXPORT void JNICALL
+Java_java_io_RandomAccessFile_open(JNIEnv* e, jclass, jstring path,
+                                   jlongArray result)
+{
+  const char* chars = e->GetStringUTFChars(path, 0);
+  if (chars) {
+    Mapping* mapping = map(e, chars);
+
+    jlong peer = reinterpret_cast<jlong>(mapping);
+    e->SetLongArrayRegion(result, 0, 1, &peer);
+
+    jlong length = (mapping ? mapping->length : 0);
+    e->SetLongArrayRegion(result, 1, 1, &length);
+
+    e->ReleaseStringUTFChars(path, chars);
+  }
+}
+
+extern "C" JNIEXPORT void JNICALL
+Java_java_io_RandomAccessFile_copy(JNIEnv* e, jclass, jlong peer,
+                                   jlong position, jbyteArray buffer,
+                                   int offset, int length)
+{
+  uint8_t* dst = reinterpret_cast<uint8_t*>
+    (e->GetPrimitiveArrayCritical(buffer, 0));
+
+  memcpy(dst + offset,
+         reinterpret_cast<Mapping*>(peer)->start + position,
+         length);
+
+  e->ReleasePrimitiveArrayCritical(buffer, dst, 0);
+}
+
+extern "C" JNIEXPORT void JNICALL
+Java_java_io_RandomAccessFile_close(JNIEnv* e, jclass, jlong peer)
+{
+  unmap(e, reinterpret_cast<Mapping*>(peer));
+}
diff --git a/classpath/java-nio.cpp b/classpath/java-nio.cpp
index e82f34f0dd..86eb9aa6c5 100644
--- a/classpath/java-nio.cpp
+++ b/classpath/java-nio.cpp
@@ -12,6 +12,7 @@
 #include <sys/stat.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <unistd.h>
 
 #include "jni.h"
diff --git a/classpath/java/io/ByteArrayOutputStream.java b/classpath/java/io/ByteArrayOutputStream.java
index 78a54ad249..61fb51759e 100644
--- a/classpath/java/io/ByteArrayOutputStream.java
+++ b/classpath/java/io/ByteArrayOutputStream.java
@@ -24,6 +24,13 @@ public class ByteArrayOutputStream extends OutputStream {
     this(0);
   }
 
+  public void reset() {
+    chain = null;
+    length = 0;
+    buffer = null;
+    position = 0;
+  }
+
   public int size() {
     return length;
   }
diff --git a/classpath/java/io/RandomAccessFile.java b/classpath/java/io/RandomAccessFile.java
new file mode 100644
index 0000000000..a2f40bce76
--- /dev/null
+++ b/classpath/java/io/RandomAccessFile.java
@@ -0,0 +1,72 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.io;
+
+public class RandomAccessFile {
+  private long peer;
+  private long length;
+  private long position = 0;
+  
+  public RandomAccessFile(String name, String mode)
+    throws FileNotFoundException
+  {
+    if (! mode.equals("r")) throw new IllegalArgumentException();
+
+    long[] result = new long[2];
+    open(name, result);
+    peer = result[0];
+    length = result[1];
+  }
+
+  private static native void open(String name, long[] result)
+    throws FileNotFoundException;
+
+  public long length() throws IOException {
+    return length;
+  }
+
+  public long getFilePointer() throws IOException {
+    return position;
+  }
+
+  public void seek(long position) throws IOException {
+    if (position < 0 || position > length) throw new IOException();
+
+    this.position = position;
+  }
+
+  public void readFully(byte[] buffer, int offset, int length)
+    throws IOException
+  {
+    if (peer == 0) throw new IOException();
+
+    if (length == 0) return;
+
+    if (position + length > this.length) throw new EOFException();
+
+    if (offset < 0 || offset + length > buffer.length)
+      throw new ArrayIndexOutOfBoundsException();
+
+    copy(peer, position, buffer, offset, length);
+  }
+
+  private static native void copy(long peer, long position, byte[] buffer,
+                                  int offset, int length);
+
+  public void close() throws IOException {
+    if (peer != 0) {
+      close(peer);
+      peer = 0;
+    }
+  }
+
+  private static native void close(long peer);
+}
diff --git a/classpath/java/lang/Class.java b/classpath/java/lang/Class.java
index 213d8d58c6..2d907f064b 100644
--- a/classpath/java/lang/Class.java
+++ b/classpath/java/lang/Class.java
@@ -219,6 +219,25 @@ public final class Class <T> {
     }
   }
 
+  public Constructor getDeclaredConstructor(Class ... parameterTypes)
+    throws NoSuchMethodException
+  {
+    Constructor c = null;
+    Constructor[] constructors = getDeclaredConstructors();
+
+    for (int i = 0; i < constructors.length; ++i) {
+      if (match(parameterTypes, constructors[i].getParameterTypes())) {
+        c = constructors[i];
+      }
+    }
+
+    if (c == null) {
+      throw new NoSuchMethodException();
+    } else {
+      return c;
+    }
+  }
+
   private int countConstructors(boolean publicOnly) {
     int count = 0;
     if (methodTable != null) {
diff --git a/classpath/java/lang/Integer.java b/classpath/java/lang/Integer.java
index 8a79c9babc..e524cc43c4 100644
--- a/classpath/java/lang/Integer.java
+++ b/classpath/java/lang/Integer.java
@@ -30,6 +30,10 @@ public final class Integer extends Number implements Comparable<Integer> {
     return new Integer(value);
   }
 
+  public static Integer valueOf(String value) {
+    return valueOf(parseInt(value));
+  }
+
   public boolean equals(Object o) {
     return o instanceof Integer && ((Integer) o).value == value;
   }
diff --git a/classpath/java/lang/Runtime.java b/classpath/java/lang/Runtime.java
index 51f15006c7..63a029301a 100644
--- a/classpath/java/lang/Runtime.java
+++ b/classpath/java/lang/Runtime.java
@@ -75,6 +75,8 @@ public class Runtime {
 
   public native long totalMemory();
 
+  public static native void dumpHeap(String outputFile);
+
   private static class MyProcess extends Process {
     private long pid;
     private final int in;
diff --git a/classpath/java/lang/StringBuffer.java b/classpath/java/lang/StringBuffer.java
index c3de7b00da..cc494a7496 100644
--- a/classpath/java/lang/StringBuffer.java
+++ b/classpath/java/lang/StringBuffer.java
@@ -74,7 +74,15 @@ public class StringBuffer implements CharSequence {
     sb.append(b, 0, b.length);
     return this;
   }
-  
+
+  public synchronized int indexOf(String s) {
+    return sb.indexOf(s);
+  }
+
+  public synchronized int indexOf(String s, int fromIndex) {
+    return sb.indexOf(s, fromIndex);
+  }
+
   public synchronized StringBuffer insert(int i, String s) {
     sb.insert(i, s);
     return this;
@@ -85,6 +93,11 @@ public class StringBuffer implements CharSequence {
     return this;
   }
 
+  public synchronized StringBuffer insert(int i, int v) {
+    sb.insert(i, v);
+    return this;
+  }
+
   public synchronized StringBuffer delete(int start, int end) {
     sb.delete(start, end);
     return this;
@@ -112,6 +125,10 @@ public class StringBuffer implements CharSequence {
     sb.setLength(v);
   }
 
+  public synchronized void setCharAt(int index, char ch) {
+    sb.setCharAt(index, ch);
+  }
+
   public synchronized void getChars(int srcOffset, int srcLength, char[] dst,
                                     int dstOffset)
   {
diff --git a/classpath/java/lang/StringBuilder.java b/classpath/java/lang/StringBuilder.java
index 5b4987ec4b..47b58134d1 100644
--- a/classpath/java/lang/StringBuilder.java
+++ b/classpath/java/lang/StringBuilder.java
@@ -154,6 +154,10 @@ public class StringBuilder implements CharSequence {
     return insert(i, new String(new char[] { c }, 0, 1, false));
   }
 
+  public StringBuilder insert(int i, int v) {
+    return insert(i, String.valueOf(v));
+  }
+
   public StringBuilder delete(int start, int end) {
     if (start >= end) {
       return this;
@@ -322,4 +326,10 @@ public class StringBuilder implements CharSequence {
   public CharSequence subSequence(int start, int end) {
     return substring(start, end);
   }
+
+  public void setCharAt(int index, char ch) {
+    if(index < 0 || index >= length) throw new IndexOutOfBoundsException();
+    deleteCharAt(index);
+    insert(index, ch);
+  }
 }
diff --git a/classpath/java/lang/reflect/Method.java b/classpath/java/lang/reflect/Method.java
index 39a9328c29..b28b70c045 100644
--- a/classpath/java/lang/reflect/Method.java
+++ b/classpath/java/lang/reflect/Method.java
@@ -111,8 +111,8 @@ public class Method<T> extends AccessibleObject implements Member {
     }
   }
 
-  public static native Object invoke(Method method, Object instance,
-                                     Object ... arguments)
+  private static native Object invoke(Method method, Object instance,
+                                      Object ... arguments)
     throws InvocationTargetException, IllegalAccessException;
 
   public Class getReturnType() {
diff --git a/classpath/java/util/Calendar.java b/classpath/java/util/Calendar.java
index 8d81716253..d39b8a1438 100644
--- a/classpath/java/util/Calendar.java
+++ b/classpath/java/util/Calendar.java
@@ -45,6 +45,12 @@ public abstract class Calendar {
     fields[field] = value;
   }
 
+  public void set(int year, int month, int date) {
+    set(YEAR, year);
+    set(MONTH, month);
+    set(DAY_OF_MONTH, date);
+  }
+
   public void setTime(Date date) {
     time = date.getTime();
   }
diff --git a/classpath/java/util/Locale.java b/classpath/java/util/Locale.java
index b552d8d311..c53b6f4ed1 100644
--- a/classpath/java/util/Locale.java
+++ b/classpath/java/util/Locale.java
@@ -11,7 +11,7 @@
 package java.util;
 
 public class Locale {
-  public static final Locale ENGLISH = new Locale("en");
+  public static final Locale ENGLISH = new Locale("en", "us");
 
   private final String language;
   private final String country;
diff --git a/classpath/java/util/PropertyResourceBundle.java b/classpath/java/util/PropertyResourceBundle.java
index b299a08026..01dc850537 100644
--- a/classpath/java/util/PropertyResourceBundle.java
+++ b/classpath/java/util/PropertyResourceBundle.java
@@ -23,4 +23,8 @@ public class PropertyResourceBundle extends ResourceBundle {
   public Object handleGetObject(String key) {
     return map.get(key);
   }
+
+  public Enumeration<String> getKeys() {
+    return map.keys();
+  }
 }
diff --git a/classpath/java/util/Random.java b/classpath/java/util/Random.java
index a513fd5522..856f30424a 100644
--- a/classpath/java/util/Random.java
+++ b/classpath/java/util/Random.java
@@ -58,6 +58,21 @@ public class Random {
     return next(32);
   }
 
+  public void nextBytes(byte[] bytes) {
+    final int length = bytes.length;
+    for (int i = 0; i < length;) {
+      int r = nextInt();
+      for (int j = Math.min(length - i, 4); j > 0; --j) {
+        bytes[i++] = (byte) r;
+        r >>= 8;
+      }
+    }
+  }
+
+  public long nextLong() {
+    return ((long) next(32) << 32) + next(32);
+  }
+
   public double nextDouble() {
     return (((long) next(26) << 27) + next(27)) / (double) (1L << 53);
   }
diff --git a/classpath/java/util/ResourceBundle.java b/classpath/java/util/ResourceBundle.java
index cc80a2a957..97bde9b80c 100644
--- a/classpath/java/util/ResourceBundle.java
+++ b/classpath/java/util/ResourceBundle.java
@@ -118,4 +118,6 @@ public abstract class ResourceBundle {
   }
 
   protected abstract Object handleGetObject(String key);
+
+  public abstract Enumeration<String> getKeys();
 }
diff --git a/classpath/java/util/Stack.java b/classpath/java/util/Stack.java
index c44462fba3..862e15f39e 100644
--- a/classpath/java/util/Stack.java
+++ b/classpath/java/util/Stack.java
@@ -12,7 +12,7 @@ package java.util;
 
 public class Stack<T> extends Vector<T> {
   public boolean empty() {
-    return size() != 0;
+    return size() == 0;
   }
 
   public T peek() {
diff --git a/classpath/java/util/Vector.java b/classpath/java/util/Vector.java
index acba5f7445..21bd896b7c 100644
--- a/classpath/java/util/Vector.java
+++ b/classpath/java/util/Vector.java
@@ -61,8 +61,8 @@ public class Vector<T> implements List<T> {
       return list.set(index, value);
   }
 
-  public T setElementAt(T value, int index) {
-      return set(index, value);
+  public void setElementAt(T value, int index) {
+    set(index, value);
   }
 
   public T elementAt(int index) {
diff --git a/classpath/java/util/zip/ZipEntry.java b/classpath/java/util/zip/ZipEntry.java
new file mode 100644
index 0000000000..f2d944907f
--- /dev/null
+++ b/classpath/java/util/zip/ZipEntry.java
@@ -0,0 +1,16 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.util.zip;
+
+public abstract class ZipEntry {
+  public abstract String getName();
+  public abstract int getCompressedSize();
+}
diff --git a/classpath/java/util/zip/ZipFile.java b/classpath/java/util/zip/ZipFile.java
new file mode 100644
index 0000000000..a11a3c5dd1
--- /dev/null
+++ b/classpath/java/util/zip/ZipFile.java
@@ -0,0 +1,313 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.util.zip;
+
+import java.io.File;
+import java.io.RandomAccessFile;
+import java.io.InputStream;
+import java.io.IOException;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.HashMap;
+
+public class ZipFile {
+  private final RandomAccessFile file;
+  private final Window window;
+  private final Map<String,Integer> index = new HashMap();
+
+  public ZipFile(String name) throws IOException {
+    file = new RandomAccessFile(name, "r");
+    window = new Window(file, 4096);
+    
+    int fileLength = (int) file.length();
+    int pointer = fileLength - 22;
+    byte[] magic = new byte[] { 0x50, 0x4B, 0x05, 0x06 };
+    while (pointer > 0) {
+      if (equal(window.data, window.seek(pointer, magic.length),
+                magic, 0, magic.length))
+      {
+        pointer = directoryOffset(window, pointer);
+
+        magic = new byte[] { 0x50, 0x4B, 0x01, 0x02 };
+        while (pointer < fileLength) {
+          if (equal(window.data, window.seek(pointer, magic.length),
+                    magic, 0, magic.length))
+          {
+            index.put(entryName(window, pointer), pointer);
+            pointer = entryEnd(window, pointer);
+          } else {
+            pointer = fileLength;
+          }
+        }
+        pointer = 0;
+      } else {
+        -- pointer;
+      }
+    }
+  }
+
+  public ZipFile(File file) throws IOException {
+    this(file.getAbsolutePath());
+  }
+
+  public int size() {
+    return index.size();
+  }
+
+  public Enumeration<ZipEntry> entries() {
+    return new MyEnumeration(window, index.values().iterator());
+  }
+
+  public ZipEntry getEntry(String name) {
+    Integer pointer = index.get(name);
+    return (pointer == null ? null : new MyZipEntry(window, pointer));
+  }
+
+  public InputStream getInputStream(ZipEntry entry) throws IOException {
+    int pointer = ((MyZipEntry) entry).pointer;
+    int method = compressionMethod(window, pointer);
+    int size = compressedSize(window, pointer);
+    InputStream in = new MyInputStream(file, fileData(window, pointer), size);
+
+    final int Stored = 0;
+    final int Deflated = 8;
+
+    switch (method) {
+    case Stored:
+      return in;
+
+    case Deflated:
+      return new InflaterInputStream(in, new Inflater(true));
+
+    default:
+      throw new IOException();
+    }
+  }
+
+  private static boolean equal(byte[] a, int aOffset, byte[] b, int bOffset,
+                               int size)
+  {
+    for (int i = 0; i < size; ++i) {
+      if (a[aOffset + i] != b[bOffset + i]) return false;
+    }
+    return true;
+  }
+
+  private static int get2(Window w, int p) throws IOException {
+    int offset = w.seek(p, 2);
+    return
+      ((w.data[offset + 1] & 0xFF) <<  8) |
+      ((w.data[offset    ] & 0xFF)      );
+  }
+
+  private static int get4(Window w, int p) throws IOException {
+    int offset = w.seek(p, 4);
+    return
+      ((w.data[offset + 3] & 0xFF) << 24) |
+      ((w.data[offset + 2] & 0xFF) << 16) |
+      ((w.data[offset + 1] & 0xFF) <<  8) |
+      ((w.data[offset    ] & 0xFF)      );
+  }
+
+  private static int directoryOffset(Window w, int p) throws IOException {
+    return get4(w, p + 16);
+  }
+
+  private static int entryNameLength(Window w, int p) throws IOException {
+    return get2(w, p + 28);
+  }
+
+  private static String entryName(Window w, int p) throws IOException {
+    int length = entryNameLength(w, p);
+    return new String(w.data, w.seek(p + 46, length), length);
+  }
+
+  private static int compressionMethod(Window w, int p) throws IOException {
+    return get2(w, p + 10);
+  }
+
+  private static int compressedSize(Window w, int p) throws IOException {
+    return get4(w, p + 20);
+  }
+
+  private static int fileNameLength(Window w, int p) throws IOException {
+    return get2(w, p + 28);
+  }
+
+  private static int extraFieldLength(Window w, int p) throws IOException {
+    return get2(w, p + 30);
+  }
+
+  private static int commentFieldLength(Window w, int p) throws IOException {
+    return get2(w, p + 32);
+  }
+
+  private static int entryEnd(Window w, int p) throws IOException {
+    final int HeaderSize = 46;
+    return p + HeaderSize
+      + fileNameLength(w, p)
+      + extraFieldLength(w, p)
+      + commentFieldLength(w, p);
+  }
+
+  private static int fileData(Window w, int p) throws IOException {
+    int localHeader = localHeader(w, p);
+    final int LocalHeaderSize = 30;
+    return localHeader
+      + LocalHeaderSize
+      + localFileNameLength(w, localHeader)
+      + localExtraFieldLength(w, localHeader);
+  }
+
+  private static int localHeader(Window w, int p) throws IOException {
+    return get4(w, p + 42);
+  }
+
+  private static int localFileNameLength(Window w, int p) throws IOException {
+    return get2(w, p + 26);
+  }
+
+  private static int localExtraFieldLength(Window w, int p)
+    throws IOException
+  {
+    return get2(w, p + 28);
+  }
+
+  public void close() throws IOException {
+    file.close();
+  }
+
+  private static class Window {
+    private final RandomAccessFile file;
+    public final byte[] data;
+    public int start;
+    public int length;
+    
+    public Window(RandomAccessFile file, int size) {
+      this.file = file;
+      data = new byte[size];
+    }
+
+    public int seek(int start, int length) throws IOException {
+      int fileLength = (int) file.length();
+
+      if (length > data.length) {
+        throw new IllegalArgumentException
+          ("length " + length + " greater than buffer length " + data.length);
+      }
+
+      if (start < 0) {
+        throw new IllegalArgumentException("negative start " + start);
+      }
+
+      if (start + length > fileLength) {
+        throw new IllegalArgumentException
+          ("end " + (start + length) + " greater than file length " +
+           fileLength);
+      }
+
+      if (start < this.start || start + length > this.start + this.length) {
+        this.length = Math.min(data.length, fileLength);
+        this.start = start - ((this.length - length) / 2);
+        if (this.start < 0) {
+          this.start = 0;
+        } else if (this.start + this.length > fileLength) {
+          this.start = fileLength - this.length;
+        }
+        file.seek(this.start);
+        file.readFully(data, 0, this.length);
+      }
+
+      return start - this.start;
+    }
+  }
+
+  private static class MyZipEntry extends ZipEntry {
+    public final Window window;
+    public final int pointer;
+
+    public MyZipEntry(Window window, int pointer) {
+      this.window = window;
+      this.pointer = pointer;
+    }
+
+    public String getName() {
+      try {
+        return entryName(window, pointer);
+      } catch (IOException e) {
+        return null;
+      }
+    }
+
+    public int getCompressedSize() {
+      try {
+        return compressedSize(window, pointer);
+      } catch (IOException e) {
+        return 0;
+      }
+    }
+  }
+
+  private static class MyEnumeration implements Enumeration<ZipEntry> {
+    private final Window window;
+    private final Iterator<Integer> iterator;
+
+    public MyEnumeration(Window window, Iterator<Integer> iterator) {
+      this.window = window;
+      this.iterator = iterator;
+    }
+
+    public boolean hasMoreElements() {
+      return iterator.hasNext();
+    }
+
+    public ZipEntry nextElement() {
+      return new MyZipEntry(window, iterator.next());
+    }
+  }
+
+  private static class MyInputStream extends InputStream {
+    private RandomAccessFile file;
+    private int offset;
+    private int length;
+
+    public MyInputStream(RandomAccessFile file, int start, int length) {
+      this.file = file;
+      this.offset = start;
+      this.length = length;
+    }
+
+    public int read() throws IOException {
+      byte[] b = new byte[1];
+      int c = read(b);
+      return (c == -1 ? -1 : b[0] & 0xFF);
+    }
+
+    public int read(byte[] b, int offset, int length) throws IOException {
+      if (this.length == 0) return -1;
+
+      if (length > this.length) length = this.length;
+
+      file.seek(this.offset);
+      file.readFully(b, offset, length);
+
+      this.offset += length;
+      this.length -= length;
+
+      return length;
+    }
+
+    public void close() throws IOException {
+      file = null;
+    }
+  }
+}
diff --git a/classpath/jni-util.h b/classpath/jni-util.h
index 8d29a12d1b..9e0972225a 100644
--- a/classpath/jni-util.h
+++ b/classpath/jni-util.h
@@ -11,6 +11,9 @@
 #ifndef JNI_UTIL
 #define JNI_UTIL
 
+#include "stdio.h"
+#include "stdlib.h"
+
 #undef JNIEXPORT
 #ifdef __MINGW32__
 #  define JNIEXPORT __declspec(dllexport)
@@ -23,15 +26,37 @@
 namespace {
 
 inline void
-throwNew(JNIEnv* e, const char* class_, const char* message)
+throwNew(JNIEnv* e, const char* class_, const char* message, ...)
 {
   jclass c = e->FindClass(class_);
   if (c) {
-    e->ThrowNew(c, message);
+    if (message) {
+      static const unsigned BufferSize = 256;
+      char buffer[BufferSize];
+
+      va_list list;
+      va_start(list, message);
+      vsnprintf(buffer, BufferSize - 1, message, list);
+      va_end(list);
+      
+      e->ThrowNew(c, buffer);
+    } else {
+      e->ThrowNew(c, 0);
+    }
     e->DeleteLocalRef(c);
   }
 }
 
+inline void*
+allocate(JNIEnv* e, unsigned size)
+{
+  void* p = malloc(size);
+  if (p == 0) {
+    throwNew(e, "java/lang/OutOfMemoryError", 0);
+  }
+  return p;
+}
+
 } // namespace
 
 #endif//JNI_UTIL
diff --git a/makefile b/makefile
index 3eab115579..51e6bfff00 100644
--- a/makefile
+++ b/makefile
@@ -3,21 +3,18 @@ MAKEFLAGS = -s
 name = avian
 version = 0.1.1
 
-build-arch = $(shell uname -m)
+build-arch = $(shell uname -m | sed 's/^i.86$$/i386/')
 ifeq ($(build-arch),Power)
 	build-arch = powerpc
 endif
-ifeq ($(build-arch),i586)
-	build-arch = i386
-endif
-ifeq ($(build-arch),i686)
-	build-arch = i386
-endif
 
-build-platform = $(shell uname -s | tr [:upper:] [:lower:])
+build-platform = \
+	$(shell uname -s | tr [:upper:] [:lower:] \
+		| sed 's/^mingw32.*$$/mingw32/' \
+		| sed 's/^cygwin.*$$/cygwin/')
 
 arch = $(build-arch)
-platform = $(build-platform)
+platform = $(subst cygwin,windows,$(subst mingw32,windows,$(build-platform)))
 
 ifeq ($(platform),windows)
 	arch = i386
@@ -44,31 +41,38 @@ cxx = $(build-cxx)
 cc = $(build-cc)
 ar = ar
 ranlib = ranlib
+dlltool = dlltool
 objcopy = objcopy
 vg = nice valgrind --num-callers=32 --db-attach=yes --freelist-vol=100000000
 vg += --leak-check=full --suppressions=valgrind.supp
 db = gdb --args
-javac = javac
-jar = jar
+javac = "$(JAVA_HOME)/bin/javac"
+jar = "$(JAVA_HOME)/bin/jar"
 strip = :
 strip-all = --strip-all
 
 rdynamic = -rdynamic
 
-warnings = -Wall -Wextra -Werror -Wunused-parameter -Winit-self
+# note that we supress the non-virtual-dtor warning because we never
+# use the delete operator, which means we don't need virtual
+# destructors:
+warnings = -Wall -Wextra -Werror -Wunused-parameter -Winit-self \
+	-Wno-non-virtual-dtor
 
 common-cflags = $(warnings) -fno-rtti -fno-exceptions \
-	-I$(JAVA_HOME)/include -idirafter $(src) -I$(native-build) \
+	"-I$(JAVA_HOME)/include" -idirafter $(src) -I$(native-build) \
 	-D__STDC_LIMIT_MACROS -D_JNI_IMPLEMENTATION_ -DAVIAN_VERSION=\"$(version)\" \
 	-DBOOT_CLASSPATH=\"[classpathJar]\"
 
 build-cflags = $(common-cflags) -fPIC -fvisibility=hidden \
-	-I$(JAVA_HOME)/include/linux -I$(src) -pthread
+	"-I$(JAVA_HOME)/include/linux" -I$(src) -pthread
 
 cflags = $(build-cflags)
 
 common-lflags = -lm -lz
 
+build-lflags =
+
 lflags = $(common-lflags) -lpthread -ldl
 
 system = posix
@@ -83,6 +87,8 @@ so-suffix = .so
 
 shared = -shared
 
+native-path = echo
+
 ifeq ($(arch),i386)
 	object-arch = i386
 	object-format = elf32-i386
@@ -96,8 +102,7 @@ ifeq ($(arch),powerpc)
 endif
 
 ifeq ($(platform),darwin)
-	build-cflags = $(common-cflags) -fPIC -fvisibility=hidden \
-		-I$(JAVA_HOME)/include/linux -I$(src)
+	build-cflags = $(common-cflags) -fPIC -fvisibility=hidden -I$(src)
 	lflags = $(common-lflags) -ldl -framework CoreFoundation
 	rdynamic =
 	strip-all = -S -x
@@ -107,25 +112,37 @@ ifeq ($(platform),darwin)
 endif
 
 ifeq ($(platform),windows)
-	inc = $(root)/win32/include
-	lib = $(root)/win32/lib
+	inc = "$(root)/win32/include"
+	lib = "$(root)/win32/lib"
 
 	system = windows
 	object-format = pe-i386
 
 	so-prefix =
 	so-suffix = .dll
+	exe-suffix = .exe
 
-	cxx = i586-mingw32msvc-g++
-	cc = i586-mingw32msvc-gcc
-	dlltool = i586-mingw32msvc-dlltool
-	ar = i586-mingw32msvc-ar
-	ranlib = i586-mingw32msvc-ranlib
-	objcopy = i586-mingw32msvc-objcopy
-
-	rdynamic = -Wl,--export-dynamic
 	lflags = -L$(lib) $(common-lflags) -lws2_32 -mwindows -mconsole
 	cflags = $(common-cflags) -I$(inc)
+
+	ifeq (,$(filter mingw32 cygwin,$(build-platform)))
+		cxx = i586-mingw32msvc-g++
+		cc = i586-mingw32msvc-gcc
+		dlltool = i586-mingw32msvc-dlltool
+		ar = i586-mingw32msvc-ar
+		ranlib = i586-mingw32msvc-ranlib
+		objcopy = i586-mingw32msvc-objcopy
+	else
+		build-cflags = $(common-cflags) \
+			"-I$(JAVA_HOME)/include/win32" -I$(src) -mthreads
+		ifeq ($(build-platform),cygwin)
+			build-lflags += -mno-cygwin
+			build-cflags += -mno-cygwin
+			lflags += -mno-cygwin
+			cflags += -mno-cygwin
+			native-path = cygpath -m
+		endif
+	endif
 endif
 
 ifeq ($(mode),debug)
@@ -144,6 +161,10 @@ ifeq ($(mode),fast)
 	cflags += -O3 -g3 -DNDEBUG
 	strip = strip
 endif
+ifeq ($(mode),small)
+	cflags += -Os -g3 -DNDEBUG
+	strip = strip
+endif
 
 cpp-objects = $(foreach x,$(1),$(patsubst $(2)/%.cpp,$(3)/%.o,$(x)))
 asm-objects = $(foreach x,$(1),$(patsubst $(2)/%.S,$(3)/%-asm.o,$(x)))
@@ -190,6 +211,11 @@ vm-sources = \
 	$(src)/process.cpp \
 	$(src)/$(asm).cpp
 
+ifeq ($(heapdump),true)
+	vm-sources += $(src)/heapdump.cpp
+	cflags += -DAVIAN_HEAPDUMP
+endif
+
 vm-asm-sources = $(src)/$(asm).S
 
 ifeq ($(process),compile)
@@ -220,9 +246,9 @@ generator-objects = \
 generator = $(native-build)/generator
 
 static-library = $(native-build)/lib$(name).a
-executable = $(native-build)/$(name)
+executable = $(native-build)/$(name)${exe-suffix}
 dynamic-library = $(native-build)/$(so-prefix)$(name)$(so-suffix)
-executable-dynamic = $(native-build)/$(name)-dynamic
+executable-dynamic = $(native-build)/$(name)-dynamic${exe-suffix}
 
 classpath-sources = $(shell find $(classpath) -name '*.java')
 classpath-classes = \
@@ -261,7 +287,7 @@ vg: build
 
 .PHONY: test
 test: build
-	/bin/bash $(test)/test.sh 2>/dev/null \
+	/bin/sh $(test)/test.sh 2>/dev/null \
 		$(executable) $(mode) "$(flags)" \
 		$(call class-names,$(test-build),$(test-classes))
 
@@ -299,7 +325,7 @@ $(classpath-dep): $(classpath-sources)
 	@echo "compiling classpath classes"
 	@mkdir -p $(dir $(@))
 	$(javac) -d $(dir $(@)) -bootclasspath $(classpath-build) \
-		$(shell make -s --no-print-directory $(classpath-classes))
+		$(shell $(MAKE) -s --no-print-directory $(classpath-classes))
 	@touch $(@)
 
 $(test-build)/%.class: $(test)/%.java
@@ -309,7 +335,7 @@ $(test-dep): $(test-sources)
 	@echo "compiling test classes"
 	@mkdir -p $(dir $(@))
 	$(javac) -d $(dir $(@)) -bootclasspath $(classpath-build) \
-		$(shell make -s --no-print-directory $(test-classes))
+		$(shell $(MAKE) -s --no-print-directory $(test-classes))
 	@touch $(@)
 
 define compile-object
@@ -318,11 +344,17 @@ define compile-object
 	$(cxx) $(cflags) -c $(<) -o $(@)
 endef
 
+define compile-asm-object
+	@echo "compiling $(@)"
+	@mkdir -p $(dir $(@))
+	$(cc) -I$(src) -c $(<) -o $(@)
+endef
+
 $(vm-cpp-objects): $(native-build)/%.o: $(src)/%.cpp $(vm-depends)
 	$(compile-object)
 
 $(vm-asm-objects): $(native-build)/%-asm.o: $(src)/%.S
-	$(compile-object)
+	$(compile-asm-object)
 
 $(driver-object): $(driver-source)
 	$(compile-object)
@@ -339,7 +371,7 @@ $(boot-object): $(boot-source)
 $(build)/classpath.jar: $(classpath-dep)
 	(wd=$$(pwd); \
 	 cd $(classpath-build); \
-	 $(jar) c0f $${wd}/$(@) $$(find . -name '*.class'))
+	 $(jar) c0f "$$($(native-path) "$${wd}/$(@)")" $$(find . -name '*.class'))
 
 $(binaryToMacho): $(src)/binaryToMacho.cpp
 	$(cxx) $(^) -o $(@)
@@ -353,7 +385,7 @@ else
 	(wd=$$(pwd); \
 	 cd $(build); \
 	 $(objcopy) -I binary classpath.jar \
-		 -O $(object-format) -B $(object-arch) $${wd}/$(@))
+		 -O $(object-format) -B $(object-arch) "$${wd}/$(@)")
 endif
 
 $(generator-objects): $(native-build)/%.o: $(src)/%.cpp
@@ -377,7 +409,7 @@ $(executable): \
 	@echo "linking $(@)"
 ifeq ($(platform),windows)
 	$(dlltool) -z $(@).def $(^)
-	$(dlltool) -k -d $(@).def -e $(@).exp
+	$(dlltool) -d $(@).def -e $(@).exp
 	$(cc) $(@).exp $(^) $(lflags) -o $(@)
 else
 	$(cc) $(^) $(rdynamic) $(lflags) -o $(@)
@@ -398,5 +430,5 @@ $(executable-dynamic): $(driver-dynamic-object) $(dynamic-library)
 
 $(generator): $(generator-objects)
 	@echo "linking $(@)"
-	$(build-cc) $(^) -o $(@)
+	$(build-cc) $(^) $(build-lflags) -o $(@)
 
diff --git a/readme.txt b/readme.txt
index 2efc5b8c84..c4e80a3cfd 100644
--- a/readme.txt
+++ b/readme.txt
@@ -10,6 +10,21 @@ on Mac OS X:
  $ export JAVA_HOME=/Library/Java/Home
  $ make
  $ build/darwin-i386-compile-fast/avian -cp build/test Hello
+ 
+on Windows (MSYS):
+
+ $ export JAVA_HOME="C:/Program Files/Java/jdk1.6.0_07"
+ $ make
+ $ build/windows-i386-compile-fast/avian -cp build/test Hello
+
+on Windows (Cygwin):
+
+ $ export JAVA_HOME="/cygdrive/c/Program Files/Java/jdk1.6.0_07"
+ $ make
+ $ build/windows-i386-compile-fast/avian -cp build/test Hello
+
+Adjust JAVA_HOME according to your system, but be sure to use forward
+slashes in the path.
 
 
 Introduction
@@ -40,10 +55,6 @@ Avian can currently target the following platforms:
   Win32 (i386)
   Mac OS X (i386)
 
-The Win32 port may be built on Linux using a MinGW cross compiler and
-build environment.  Builds on MSYS or Cygwin are not yet supported,
-but patches to enable them are welcome.
-
 
 Building
 --------
@@ -60,20 +71,11 @@ Build requirements include:
 Earlier versions of some of these packages may also work but have not
 been tested.
 
-If you are cross-compiling for Windows, you may find it useful to use
-our win32 repository: (run this from the directory containing the
-avian directory)
-
-  $ git clone git://oss.readytalk.com/win32.git
-
-This gives you the Windows JNI headers, zlib headers and library, and
-a few other useful libraries like OpenSSL and libjpeg.
-
 The build is directed by a single makefile and may be influenced via
 certain flags described below.
 
  $ make platform={linux,windows,darwin} arch={i386,x86_64} \
-     process={compile,interpret} mode={debug,debug-fast,fast}
+     process={compile,interpret} mode={debug,debug-fast,fast,small}
 
   * platform - the target platform
       default: output of $(uname -s | tr [:upper:] [:lower:])
@@ -89,6 +91,33 @@ certain flags described below.
   * process - choice between pure interpreter or JIT compiler
       default: compile
 
+If you are compiling for Windows, you may either cross-compile using
+MinGW or build natively on Windows under MSYS or Cygwin.
+
+Installing MSYS:
+
+  1. Download and install the current MinGW and MSYS packages from
+  mingw.org, selecting the C and C++ compilers when prompted.  Use the
+  post-install script to create the filesystem link to the compiler.
+
+  2. Download GNU Make 3.81 from the MSYS download page
+  (make-3.81-MSYS-1.0.11-2.tar.bz2) and extract the tar file into
+  e.g. c:/msys/1.0.
+
+Installing Cygwin:
+
+  1. Download and run setup.exe from cygwin.com, installing the base
+  system and these packages: make, gcc-mingw-g++, and (optionally)
+  git.
+
+You may also find our win32 repository useful: (run this from the
+directory containing the avian directory)
+
+  $ git clone git://oss.readytalk.com/win32.git
+
+This gives you the Windows JNI headers, zlib headers and library, and
+a few other useful libraries like OpenSSL and libjpeg.
+
 
 Installing
 ----------
@@ -102,6 +131,9 @@ Embedding
 The following series of commands illustrates how to produce a
 stand-alone executable out of a Java application using Avian.
 
+Note: if you are building on Cygwin, add -mno-cygwin to each of the
+compile and link commands below.
+
 Step 1: Build Avian, create a new directory, and populate it with the
 VM object files and bootstrap classpath jar.
 
@@ -223,7 +255,17 @@ main(int ac, const char** av)
   return exitCode;
 }
 EOF
- $ g++ -I$JAVA_HOME/include -c main.cpp -o main.o
+
+on Linux:
+ $ g++ -I$JAVA_HOME/include -I$JAVA_HOME/include/linux \
+     -D_JNI_IMPLEMENTATION_ -c main.cpp -o main.o
+
+on Mac OS X:
+ $ g++ -I$JAVA_HOME/include -D_JNI_IMPLEMENTATION_ -c main.cpp -o main.o
+
+on Windows:
+ $ g++ -I$JAVA_HOME/include -I$JAVA_HOME/include/win32 \
+     -D_JNI_IMPLEMENTATION_ -c main.cpp -o main.o
 
 
 Step 5: Link the objects produced above to produce the final
@@ -237,3 +279,9 @@ on Mac OS X:
  $ g++ -rdynamic *.o -ldl -lpthread -lz -o hello -framework CoreFoundation
  $ strip -S -x hello
 
+on Windows:
+ $ dlltool -z hello.def *.o
+ $ dlltool -d hello.def -e hello.exp
+ $ g++ hello.exp *.o -L../../win32/lib -lmingwthrd -lm -lz -lws2_32 \
+     -mwindows -mconsole -o hello.exe
+ $ strip --strip-all hello.exe
diff --git a/src/allocator.h b/src/allocator.h
index 4951a7be08..c78273ad8e 100644
--- a/src/allocator.h
+++ b/src/allocator.h
@@ -17,7 +17,6 @@ namespace vm {
 
 class Allocator {
  public:
-  virtual ~Allocator() { }
   virtual void* tryAllocate(unsigned size) = 0;
   virtual void* allocate(unsigned size) = 0;
   virtual void free(const void* p, unsigned size) = 0;
diff --git a/src/assembler.h b/src/assembler.h
index df63d4fd99..7992f7c892 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -78,8 +78,6 @@ const int NoRegister = -1;
 
 class Promise {
  public:
-  virtual ~Promise() { }
-
   virtual int64_t value() = 0;
   virtual bool resolved() = 0;
 };
@@ -101,8 +99,6 @@ class ResolvedPromise: public Promise {
 
 class TraceHandler {
  public:
-  virtual ~TraceHandler() { }
-
   virtual void handleTrace(Promise* address, unsigned padIndex,
                            unsigned padding) = 0;
 };
@@ -147,8 +143,6 @@ class Assembler {
 
   class Client {
    public:
-    virtual ~Client() { }
-
     virtual int acquireTemporary
     (uint32_t mask = ~static_cast<uint32_t>(0)) = 0;
     virtual void releaseTemporary(int r) = 0;
@@ -159,15 +153,11 @@ class Assembler {
 
   class Block {
    public:
-    virtual ~Block() { }
-
     virtual unsigned resolve(unsigned start, Block* next) = 0;
   };
 
   class Architecture {
    public:
-    virtual ~Architecture() { }
-
     virtual unsigned registerCount() = 0;
 
     virtual int stack() = 0;
@@ -214,8 +204,6 @@ class Assembler {
     virtual void release() = 0;
   };
 
-  virtual ~Assembler() { }
-
   virtual void setClient(Client* client) = 0;
 
   virtual Architecture* arch() = 0;
diff --git a/src/boot.cpp b/src/boot.cpp
index e3f91f6c0d..9f4c96a612 100644
--- a/src/boot.cpp
+++ b/src/boot.cpp
@@ -11,10 +11,9 @@
 #include "stdint.h"
 #include "stdlib.h"
 
-// since we don't link against libstdc++, we must implement some dummy
-// functions:
+// since we aren't linking against libstdc++, we must implement this
+// ourselves:
 extern "C" void __cxa_pure_virtual(void) { abort(); }
-void operator delete(void*) { abort(); }
 
 #ifdef __MINGW32__
 #  define EXPORT __declspec(dllexport)
diff --git a/src/builtin.cpp b/src/builtin.cpp
index 396088dc56..718b05f5cb 100644
--- a/src/builtin.cpp
+++ b/src/builtin.cpp
@@ -456,6 +456,13 @@ Java_java_lang_System_getVMProperty(Thread* t, jclass, jstring name,
     r = makeLocalReference(t, makeString(t, "%s", t->m->finder->path()));
   } else if (strcmp(n, "avian.version") == 0) {
     r = makeLocalReference(t, makeString(t, AVIAN_VERSION));
+  } else if (strcmp(n, "file.encoding") == 0) {
+    r = makeLocalReference(t, makeString(t, "ASCII"));
+  } else {
+    const char* v = findProperty(t, n);
+    if (v) {
+      r = makeLocalReference(t, makeString(t, v));
+    }
   }
   
   if (r) {
@@ -536,8 +543,9 @@ Java_java_lang_Runtime_load(Thread* t, jclass, jstring name, jboolean mapName)
   char n[length + 1];
   stringChars(t, *name, n);
 
-  if (mapName and t->m->builtins) {
-    const char* s = t->m->builtins;
+  const char* builtins = findProperty(t, "avian.builtins");
+  if (mapName and builtins) {
+    const char* s = builtins;
     while (*s) {
       if (strncmp(s, n, length) == 0
           and (s[length] == ',' or s[length] == 0))
@@ -578,6 +586,30 @@ Java_java_lang_Runtime_gc(Thread* t, jobject)
   collect(t, Heap::MajorCollection);
 }
 
+#ifdef AVIAN_HEAPDUMP
+
+extern "C" JNIEXPORT void JNICALL
+Java_java_lang_Runtime_dumpHeap(Thread* t, jclass, jstring outputFile)
+{
+  ENTER(t, Thread::ActiveState);
+
+  unsigned length = stringLength(t, *outputFile);
+  char n[length + 1];
+  stringChars(t, *outputFile, n);
+  FILE* out = fopen(n, "wb");
+  if (out) {
+    { ENTER(t, Thread::ExclusiveState);
+      dumpHeap(t, out);
+    }
+    fclose(out);
+  } else {
+    object message = makeString(t, "file not found: %s", n);
+    t->exception = makeRuntimeException(t, message);
+  }
+}
+
+#endif//AVIAN_HEAPDUMP
+
 extern "C" JNIEXPORT void JNICALL
 Java_java_lang_Runtime_exit(Thread* t, jobject, jint code)
 {
diff --git a/src/compile.cpp b/src/compile.cpp
index 37d31f8ec9..697f134a9c 100644
--- a/src/compile.cpp
+++ b/src/compile.cpp
@@ -27,7 +27,7 @@ vmCall();
 
 namespace {
 
-const bool Verbose = true;
+const bool DebugCompile = true;
 const bool DebugNatives = false;
 const bool DebugCallTable = false;
 const bool DebugMethodTree = false;
@@ -2387,7 +2387,8 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
     } break;
 
     case goto_: {
-      uint32_t newIp = (ip - 3) + codeReadInt16(t, code, ip);
+      uint32_t offset = codeReadInt16(t, code, ip);
+      uint32_t newIp = (ip - 3) + offset;
       assert(t, newIp < codeLength(t, code));
 
       c->jmp(frame->machineIp(newIp));
@@ -2395,7 +2396,8 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
     } break;
 
     case goto_w: {
-      uint32_t newIp = (ip - 5) + codeReadInt32(t, code, ip);
+      uint32_t offset = codeReadInt32(t, code, ip);
+      uint32_t newIp = (ip - 5) + offset;
       assert(t, newIp < codeLength(t, code));
 
       c->jmp(frame->machineIp(newIp));
@@ -2480,7 +2482,8 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
 
     case if_acmpeq:
     case if_acmpne: {
-      uint32_t newIp = (ip - 3) + codeReadInt16(t, code, ip);
+      uint32_t offset = codeReadInt16(t, code, ip);
+      uint32_t newIp = (ip - 3) + offset;
       assert(t, newIp < codeLength(t, code));
         
       Compiler::Operand* a = frame->popObject();
@@ -2504,7 +2507,8 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
     case if_icmpge:
     case if_icmplt:
     case if_icmple: {
-      uint32_t newIp = (ip - 3) + codeReadInt16(t, code, ip);
+      uint32_t offset = codeReadInt16(t, code, ip);
+      uint32_t newIp = (ip - 3) + offset;
       assert(t, newIp < codeLength(t, code));
         
       Compiler::Operand* a = frame->popInt();
@@ -2543,7 +2547,8 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
     case ifge:
     case iflt:
     case ifle: {
-      uint32_t newIp = (ip - 3) + codeReadInt16(t, code, ip);
+      uint32_t offset = codeReadInt16(t, code, ip);
+      uint32_t newIp = (ip - 3) + offset;
       assert(t, newIp < codeLength(t, code));
 
       Compiler::Operand* a = frame->popInt();
@@ -2577,7 +2582,8 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
 
     case ifnull:
     case ifnonnull: {
-      uint32_t newIp = (ip - 3) + codeReadInt16(t, code, ip);
+      uint32_t offset = codeReadInt16(t, code, ip);
+      uint32_t newIp = (ip - 3) + offset;
       assert(t, newIp < codeLength(t, code));
 
       Compiler::Operand* a = frame->popObject();
@@ -2824,14 +2830,18 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
       uint32_t newIp;
 
       if (instruction == jsr) {
-        newIp = (ip - 3) + codeReadInt16(t, code, ip);
+        uint32_t offset = codeReadInt16(t, code, ip);
+        newIp = (ip - 3) + offset;
       } else {
-        newIp = (ip - 5) + codeReadInt32(t, code, ip);
+        uint32_t offset = codeReadInt32(t, code, ip);
+        newIp = (ip - 5) + offset;
       }
 
       assert(t, newIp < codeLength(t, code));
 
       // todo: flush stack to memory here
+      abort(t);
+
       Compiler::State* state = c->saveState();
 
       frame->pushAddress(frame->machineIp(ip));
@@ -3447,12 +3457,26 @@ compile(MyThread* t, Frame* initialFrame, unsigned ip,
 }
 
 void
-logCompile(const void* code, unsigned size, const char* class_,
+logCompile(MyThread* t, const void* code, unsigned size, const char* class_,
            const char* name, const char* spec)
 {
-  fprintf(stderr, "%s.%s%s: %p %p\n",
-          class_, name, spec, code,
-          static_cast<const uint8_t*>(code) + size);
+  static FILE* log = 0;
+  static bool open = false;
+  if (not open) {
+    open = true;
+    const char* path = findProperty(t, "avian.jit.log");
+    if (name) {
+      log = fopen(path, "wb");
+    } else if (DebugCompile) {
+      log = stderr;
+    }
+  }
+
+  if (log) {
+    fprintf(log, "%p %p %s.%s%s\n",
+            code, static_cast<const uint8_t*>(code) + size,
+            class_, name, spec);
+  }
 }
 
 void
@@ -3717,9 +3741,7 @@ finish(MyThread* t, Assembler* a, const char* name)
 
   a->writeTo(start);
 
-  if (Verbose) {
-    logCompile(start, a->length(), 0, name, 0);
-  }
+  logCompile(t, start, a->length(), 0, name, 0);
 
   return result;
 }
@@ -3861,16 +3883,14 @@ finish(MyThread* t, Context* context)
     set(t, result, SingletonBody + offset, p->value);
   }
 
-  if (Verbose) {
-    logCompile
-      (start, codeSize,
-       reinterpret_cast<const char*>
-       (&byteArrayBody(t, className(t, methodClass(t, context->method)), 0)),
-       reinterpret_cast<const char*>
-       (&byteArrayBody(t, methodName(t, context->method), 0)),
-       reinterpret_cast<const char*>
-       (&byteArrayBody(t, methodSpec(t, context->method), 0)));
-  }
+  logCompile
+    (t, start, codeSize,
+     reinterpret_cast<const char*>
+     (&byteArrayBody(t, className(t, methodClass(t, context->method)), 0)),
+     reinterpret_cast<const char*>
+     (&byteArrayBody(t, methodName(t, context->method), 0)),
+     reinterpret_cast<const char*>
+     (&byteArrayBody(t, methodSpec(t, context->method), 0)));
 
   // for debugging:
   if (false and
@@ -5092,10 +5112,7 @@ compileThunks(MyThread* t, MyProcessor* p)
   uint8_t* start = reinterpret_cast<uint8_t*>
     (&singletonValue(t, p->thunkTable, 0));
 
-  if (Verbose) {
-    logCompile(start, p->thunkSize * ThunkCount, 0, "thunkTable", 0);
-    fprintf(stderr, "thunk size: %d\n", p->thunkSize);
-  }
+  logCompile(t, start, p->thunkSize * ThunkCount, 0, "thunkTable", 0);
 
   tableContext.promise.resolved_ = true;
 
diff --git a/src/compiler.cpp b/src/compiler.cpp
index 0ecf5df82f..35d7ceaea9 100644
--- a/src/compiler.cpp
+++ b/src/compiler.cpp
@@ -86,8 +86,6 @@ class Site {
  public:
   Site(): next(0) { }
   
-  virtual ~Site() { }
-
   virtual Site* readTarget(Context*, Read*) { return this; }
 
   virtual void toString(Context*, char*, unsigned) = 0;
@@ -219,8 +217,6 @@ class Read {
     value(0), event(0), eventNext(0), size(size)
   { }
 
-  virtual ~Read() { }
-
   virtual Site* pickSite(Context* c, Value* v, bool includeBuddies) = 0;
 
   virtual Site* allocateSite(Context* c) = 0;
@@ -257,8 +253,6 @@ class Value: public Compiler::Operand {
     local(false)
   { }
 
-  virtual ~Value() { }
-
   virtual void addPredecessor(Context*, Event*) { }
   
   Read* reads;
@@ -559,8 +553,6 @@ class Event {
     readCount(0)
   { }
 
-  virtual ~Event() { }
-
   virtual const char* name() = 0;
 
   virtual void compile(Context* c) = 0;
diff --git a/src/compiler.h b/src/compiler.h
index 038fcc63fd..eb4df43bd1 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -21,8 +21,6 @@ class Compiler {
  public:
   class Client {
    public:
-    virtual ~Client() { }
-
     virtual intptr_t getThunk(UnaryOperation op, unsigned size) = 0;
     virtual intptr_t getThunk(TernaryOperation op, unsigned size) = 0;
   };
@@ -34,8 +32,6 @@ class Compiler {
   class StackElement { };
   class State { };
 
-  virtual ~Compiler() { }
-
   virtual State* saveState() = 0;
   virtual void restoreState(State* state) = 0;
 
diff --git a/src/finder.cpp b/src/finder.cpp
index 57863d5f07..0f8fa0d793 100644
--- a/src/finder.cpp
+++ b/src/finder.cpp
@@ -52,7 +52,7 @@ equal(const void* a, unsigned al, const void* b, unsigned bl)
 class Element {
  public:
   Element(): next(0) { }
-  virtual ~Element() { }
+
   virtual System::Region* find(const char* name) = 0;
   virtual bool exists(const char* name) = 0;
   virtual void dispose() = 0;
@@ -372,7 +372,7 @@ class JarIndex {
 class JarElement: public Element {
  public:
   JarElement(System* s, const char* name):
-    s(s), name(name), index(0)
+    s(s), name(name), region(0), index(0)
   { }
 
   virtual void init() {
diff --git a/src/finder.h b/src/finder.h
index 6b3a868f68..64eb4c287b 100644
--- a/src/finder.h
+++ b/src/finder.h
@@ -19,7 +19,6 @@ namespace vm {
 
 class Finder {
  public:
-  virtual ~Finder() { }
   virtual System::Region* find(const char* name) = 0;
   virtual bool exists(const char* name) = 0;
   virtual const char* path() = 0;
diff --git a/src/heap.h b/src/heap.h
index bf4dc5a360..bc8f9a5a1c 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -32,19 +32,16 @@ class Heap: public Allocator {
 
   class Visitor {
    public:
-    virtual ~Visitor() { }
     virtual void visit(void*) = 0;
   };
 
   class Walker {
    public:
-    virtual ~Walker() { }
     virtual bool visit(unsigned) = 0;
   };
 
   class Client {
    public:
-    virtual ~Client() { }
     virtual void collect(void* context, CollectionType type) = 0;
     virtual void visitRoots(Visitor*) = 0;
     virtual bool isFixed(void*) = 0;
@@ -54,7 +51,6 @@ class Heap: public Allocator {
     virtual void walk(void*, Walker*) = 0;
   };
 
-  virtual ~Heap() { }
   virtual void setClient(Client* client) = 0;
   virtual void collect(CollectionType type, unsigned footprint) = 0;
   virtual void* allocateFixed(Allocator* allocator, unsigned sizeInWords,
diff --git a/src/heapdump.cpp b/src/heapdump.cpp
new file mode 100644
index 0000000000..6d17d82e5a
--- /dev/null
+++ b/src/heapdump.cpp
@@ -0,0 +1,329 @@
+/* Copyright (c) 2008, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+#include "machine.h"
+
+using namespace vm;
+
+namespace {
+
+const uintptr_t PointerShift = log(BytesPerWord);
+
+class Set {
+ public:
+  class Entry {
+   public:
+    object value;
+    uint32_t number;
+    int next;
+  };
+
+  static unsigned footprint(unsigned capacity) {
+    return sizeof(Set)
+      + pad(sizeof(int) * capacity)
+      + pad(sizeof(Set::Entry) * capacity);
+  }
+
+  Set(unsigned capacity):
+    size(0),
+    capacity(capacity),
+    index(reinterpret_cast<int*>
+          (reinterpret_cast<uint8_t*>(this)
+           + sizeof(Set))),
+    entries(reinterpret_cast<Entry*>
+            (reinterpret_cast<uint8_t*>(index) 
+             + pad(sizeof(int) * capacity)))
+  { }
+
+  unsigned size;
+  unsigned capacity;
+  int* index;
+  Entry* entries;
+};
+
+class Stack {
+ public:
+  class Entry {
+   public:
+    object value;
+    int offset;
+  };
+
+  static const unsigned Capacity = 4096;
+
+  Stack(Stack* next): next(next), entryCount(0) { }
+
+  Stack* next;
+  unsigned entryCount;
+  Entry entries[Capacity];
+};
+
+class Context {
+ public:
+  Context(Thread* thread, FILE* out):
+    thread(thread), out(out), objects(0), stack(0), nextNumber(1)
+  { }
+
+  ~Context() {
+    if (objects) {
+      thread->m->heap->free(objects, Set::footprint(objects->capacity));
+    }
+    while (stack) {
+      Stack* dead = stack;
+      stack = dead->next;
+      thread->m->heap->free(stack, sizeof(Stack));
+    }
+  }
+
+  Thread* thread;
+  FILE* out;
+  Set* objects;
+  Stack* stack;
+  uint32_t nextNumber;
+};
+
+void
+push(Context* c, object p, int offset)
+{
+  if (c->stack == 0 or c->stack->entryCount == Stack::Capacity) {
+    c->stack = new (c->thread->m->heap->allocate(sizeof(Stack)))
+      Stack(c->stack);
+  }
+  Stack::Entry* e = c->stack->entries + (c->stack->entryCount++);
+  e->value = p;
+  e->offset = offset;
+}
+
+bool
+pop(Context* c, object* p, int* offset)
+{
+  if (c->stack) {
+    if (c->stack->entryCount == 0) {
+      if (c->stack->next) {
+        Stack* dead = c->stack;
+        c->stack = dead->next;
+        c->thread->m->heap->free(dead, sizeof(Stack));
+      } else {
+        return false;
+      }
+    }
+    Stack::Entry* e = c->stack->entries + (--c->stack->entryCount);
+    *p = e->value;
+    *offset = e->offset;
+    return true;
+  } else {
+    return false;
+  }
+}
+
+unsigned
+hash(object p, unsigned capacity)
+{
+  return (reinterpret_cast<uintptr_t>(p) >> PointerShift)
+    & (capacity - 1);
+}
+
+Set::Entry*
+find(Context* c, object p)
+{
+  if (c->objects == 0) return false;
+
+  for (int i = c->objects->index[hash(p, c->objects->capacity)]; i >= 0;) {
+    Set::Entry* e = c->objects->entries + i;
+    if (e->value == p) {
+      return e;
+    }
+    i = e->next;
+  }
+
+  return false;
+}
+
+Set::Entry*
+add(Context* c UNUSED, Set* set, object p, uint32_t number)
+{
+  assert(c->thread, set->size < set->capacity);
+
+  unsigned index = hash(p, set->capacity);
+
+  int offset = set->size++;
+  Set::Entry* e = set->entries + offset;
+  e->value = p;
+  e->number = number;
+  e->next = set->index[index];
+  set->index[index] = offset;
+  return e;
+}
+
+Set::Entry*
+add(Context* c, object p)
+{
+  if (c->objects == 0 or c->objects->size == c->objects->capacity) {
+    unsigned capacity;
+    if (c->objects) {
+      capacity = c->objects->capacity * 2;
+    } else {
+      capacity = 4096; // must be power of two
+    }
+
+    Set* set = new (c->thread->m->heap->allocate(Set::footprint(capacity)))
+      Set(capacity);
+
+    memset(set->index, 0xFF, sizeof(int) * capacity);
+
+    if (c->objects) {
+      for (unsigned i = 0; i < c->objects->capacity; ++i) {
+        for (int j = c->objects->index[i]; j >= 0;) {
+          Set::Entry* e = c->objects->entries + j;
+          add(c, set, e->value, e->number);
+          j = e->next;
+        }
+      }
+
+      c->thread->m->heap->free
+        (c->objects, Set::footprint(c->objects->capacity));
+    }
+
+    c->objects = set;
+  }
+
+  return add(c, c->objects, p, 0);
+}
+
+enum {
+  Root,
+  Size,
+  ClassName,
+  Push,
+  Pop
+};
+
+inline object
+get(object o, unsigned offsetInWords)
+{
+  return static_cast<object>
+    (mask(cast<void*>(o, offsetInWords * BytesPerWord)));
+}
+
+void
+write1(Context* c, uint8_t v)
+{
+  fwrite(&v, 1, 1, c->out);
+}
+
+void
+write4(Context* c, uint32_t v)
+{
+  uint8_t b[] = { v >> 24, (v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF };
+  fwrite(b, 4, 1, c->out);
+}
+
+void
+writeString(Context* c, int8_t* p, unsigned size)
+{
+  write4(c, size);
+  fwrite(p, size, 1, c->out);
+}
+
+unsigned
+objectSize(Thread* t, object o)
+{
+  unsigned n = baseSize(t, o, objectClass(t, o));
+  if (objectExtended(t, o)) {
+    ++ n;
+  }
+  return n;
+}
+
+void
+visit(Context* c, object p)
+{
+  Thread* t = c->thread;
+  int nextChildOffset;
+
+  write1(c, Root);
+
+ visit: {
+    Set::Entry* e = find(c, p);
+    if (e) {
+      write4(c, e->number);
+    } else {
+      e = add(c, p);
+      e->number = c->nextNumber++;
+
+      write4(c, e->number);
+
+      write1(c, Size);
+      write4(c, objectSize(t, p));
+
+      if (objectClass(t, p) == arrayBody(t, t->m->types, Machine::ClassType)) {
+        object name = className(t, p);
+        if (name) {
+          write1(c, ClassName);
+          writeString(c, &byteArrayBody(t, name, 0),
+                      byteArrayLength(t, name) - 1);
+        }
+      }
+
+      nextChildOffset = walkNext(t, p, -1);
+      if (nextChildOffset != -1) {
+        goto children;
+      }
+    }
+  }
+
+  goto pop;
+
+ children: {
+    write1(c, Push);
+    push(c, p, nextChildOffset);
+    p = get(p, nextChildOffset);
+    goto visit;
+  }
+
+ pop: {
+    if (pop(c, &p, &nextChildOffset)) {
+      write1(c, Pop);
+      nextChildOffset = walkNext(t, p, nextChildOffset);
+      if (nextChildOffset >= 0) {
+        goto children;
+      } else {
+        goto pop;
+      }
+    }
+  }
+}
+
+} // namespace
+
+namespace vm {
+
+void
+dumpHeap(Thread* t, FILE* out)
+{
+  Context context(t, out);
+
+  class Visitor : public Heap::Visitor {
+   public:
+    Visitor(Context* c): c(c) { }
+
+    virtual void visit(void* p) {
+      ::visit(c, static_cast<object>(mask(*static_cast<void**>(p))));
+    }
+
+    Context* c;
+  } v(&context);
+
+  add(&context, 0)->number = 0;
+
+  visitRoots(t->m, &v);
+}
+
+} // namespace vm
diff --git a/src/jnienv.cpp b/src/jnienv.cpp
index 329e948687..8ffb581151 100644
--- a/src/jnienv.cpp
+++ b/src/jnienv.cpp
@@ -2046,12 +2046,13 @@ populateJNITables(JavaVMVTable* vmTable, JNIEnvVTable* envTable)
 
 } // namespace vm
 
-#define BUILTINS_PROPERTY "avian.builtins"
 #define BOOTSTRAP_PROPERTY "avian.bootstrap"
+#define CRASHDIR_PROPERTY "avian.crash.dir"
 #define CLASSPATH_PROPERTY "java.class.path"
 #define BOOTCLASSPATH_PREPEND_OPTION "bootclasspath/p"
 #define BOOTCLASSPATH_OPTION "bootclasspath"
 #define BOOTCLASSPATH_APPEND_OPTION "bootclasspath/a"
+#define BOOTCLASSPATH_APPEND_OPTION "bootclasspath/a"
 
 extern "C" JNIEXPORT jint JNICALL
 JNI_GetDefaultJavaVMInitArgs(void*)
@@ -2065,12 +2066,14 @@ JNI_CreateJavaVM(Machine** m, Thread** t, void* args)
   JavaVMInitArgs* a = static_cast<JavaVMInitArgs*>(args);
 
   unsigned heapLimit = 0;
-  const char* builtins = 0;
   const char* bootLibrary = 0;
   const char* classpath = 0;
   const char* bootClasspathPrepend = "";
   const char* bootClasspath = "";
   const char* bootClasspathAppend = "";
+  const char* crashDumpDirectory = 0;
+
+  unsigned propertyCount = 0;
 
   for (int i = 0; i < a->nOptions; ++i) {
     if (strncmp(a->options[i].optionString, "-X", 2) == 0) {
@@ -2092,21 +2095,21 @@ JNI_CreateJavaVM(Machine** m, Thread** t, void* args)
       }
     } else if (strncmp(a->options[i].optionString, "-D", 2) == 0) {
       const char* p = a->options[i].optionString + 2;
-      if (strncmp(p, BUILTINS_PROPERTY "=",
-                  sizeof(BUILTINS_PROPERTY)) == 0)
-      {
-        builtins = p + sizeof(BUILTINS_PROPERTY);
-      } else if (strncmp(p, BOOTSTRAP_PROPERTY "=",
-                         sizeof(BOOTSTRAP_PROPERTY)) == 0)
+      if (strncmp(p, BOOTSTRAP_PROPERTY "=",
+                  sizeof(BOOTSTRAP_PROPERTY)) == 0)
       {
         bootLibrary = p + sizeof(BOOTSTRAP_PROPERTY);
+      } else if (strncmp(p, CRASHDIR_PROPERTY "=",
+                         sizeof(CRASHDIR_PROPERTY)) == 0)
+      {
+        crashDumpDirectory = p + sizeof(CRASHDIR_PROPERTY);
       } else if (strncmp(p, CLASSPATH_PROPERTY "=",
                          sizeof(CLASSPATH_PROPERTY)) == 0)
       {
         classpath = p + sizeof(CLASSPATH_PROPERTY);
       }
 
-      // todo: add properties to VM
+      ++ propertyCount;
     }
   }
 
@@ -2128,13 +2131,22 @@ JNI_CreateJavaVM(Machine** m, Thread** t, void* args)
   append(&classpathPointer, bootClasspathAppend, bcpal, PATH_SEPARATOR);
   append(&classpathPointer, classpath, cpl, 0);
 
-  System* s = makeSystem();
+  System* s = makeSystem(crashDumpDirectory);
   Heap* h = makeHeap(s, heapLimit);
   Finder* f = makeFinder(s, classpathBuffer, bootLibrary);
   Processor* p = makeProcessor(s, h);
 
+  const char** properties = static_cast<const char**>
+    (h->allocate(sizeof(const char*) * propertyCount));
+  const char** propertyPointer = properties;
+  for (int i = 0; i < a->nOptions; ++i) {
+    if (strncmp(a->options[i].optionString, "-D", 2) == 0) {
+      *(propertyPointer++) = a->options[i].optionString + 2;
+    }
+  }
+
   *m = new (h->allocate(sizeof(Machine)))
-    Machine(s, h, f, p, bootLibrary, builtins);
+    Machine(s, h, f, p, properties, propertyCount);
 
   *t = p->makeThread(*m, 0, 0);
 
diff --git a/src/machine.cpp b/src/machine.cpp
index 2bf6674f10..8e53e35d6a 100644
--- a/src/machine.cpp
+++ b/src/machine.cpp
@@ -198,13 +198,13 @@ visitRoots(Thread* t, Heap::Visitor* v)
 
 void
 walk(Thread*, Heap::Walker* w, uint32_t* mask, unsigned fixedSize,
-     unsigned arrayElementSize, unsigned arrayLength)
+     unsigned arrayElementSize, unsigned arrayLength, unsigned start)
 {
   unsigned fixedSizeInWords = ceiling(fixedSize, BytesPerWord);
   unsigned arrayElementSizeInWords
     = ceiling(arrayElementSize, BytesPerWord);
 
-  for (unsigned i = 0; i < fixedSizeInWords; ++i) {
+  for (unsigned i = start; i < fixedSizeInWords; ++i) {
     if (mask[i / 32] & (static_cast<uint32_t>(1) << (i % 32))) {
       if (not w->visit(i)) {
         return;
@@ -222,8 +222,19 @@ walk(Thread*, Heap::Walker* w, uint32_t* mask, unsigned fixedSize,
   }
 
   if (arrayObjectElements) {
-    for (unsigned i = 0; i < arrayLength; ++i) {
-      for (unsigned j = 0; j < arrayElementSizeInWords; ++j) {
+    unsigned arrayStart;
+    unsigned elementStart;
+    if (start > fixedSizeInWords) {
+      unsigned s = start - fixedSizeInWords;
+      arrayStart = s / arrayElementSizeInWords;
+      elementStart = s % arrayElementSizeInWords;
+    } else {
+      arrayStart = 0;
+      elementStart = 0;
+    }
+
+    for (unsigned i = arrayStart; i < arrayLength; ++i) {
+      for (unsigned j = elementStart; j < arrayElementSizeInWords; ++j) {
         unsigned k = fixedSizeInWords + j;
         if (mask[k / 32] & (static_cast<uint32_t>(1) << (k % 32))) {
           if (not w->visit
@@ -238,7 +249,7 @@ walk(Thread*, Heap::Walker* w, uint32_t* mask, unsigned fixedSize,
 }
 
 void
-walk(Thread* t, Heap::Walker* w, object o)
+walk(Thread* t, Heap::Walker* w, object o, unsigned start)
 {
   object class_ = static_cast<object>(t->m->heap->follow(objectClass(t, o)));
   object objectMask = static_cast<object>
@@ -255,16 +266,16 @@ walk(Thread* t, Heap::Walker* w, object o)
     memcpy(mask, &intArrayBody(t, objectMask, 0),
            intArrayLength(t, objectMask) * 4);
 
-    walk(t, w, mask, fixedSize, arrayElementSize, arrayLength);
+    walk(t, w, mask, fixedSize, arrayElementSize, arrayLength, start);
   } else if (classVmFlags(t, class_) & SingletonFlag) {
     unsigned length = singletonLength(t, o);
     if (length) {
       walk(t, w, singletonMask(t, o),
-           (singletonCount(t, o) + 2) * BytesPerWord, 0, 0);
-    } else {
+           (singletonCount(t, o) + 2) * BytesPerWord, 0, 0, start);
+    } else if (start == 0) {
       w->visit(0);
     }
-  } else {
+  } else if (start == 0) {
     w->visit(0);
   }
 }
@@ -1534,20 +1545,7 @@ class HeapClient: public Heap::Client {
   HeapClient(Machine* m): m(m) { }
 
   virtual void visitRoots(Heap::Visitor* v) {
-    v->visit(&(m->loader));
-    v->visit(&(m->bootstrapClassMap));
-    v->visit(&(m->monitorMap));
-    v->visit(&(m->stringMap));
-    v->visit(&(m->types));
-    v->visit(&(m->jniMethodTable));
-
-    for (Reference* r = m->jniReferences; r; r = r->next) {
-      v->visit(&(r->target));
-    }
-
-    for (Thread* t = m->rootThread; t; t = t->peer) {
-      ::visitRoots(t, v);
-    }
+    ::visitRoots(m, v);
 
     postVisit(m->rootThread, v);
   }
@@ -1616,7 +1614,7 @@ class HeapClient: public Heap::Client {
 
   virtual void walk(void* p, Heap::Walker* w) {
     object o = static_cast<object>(m->heap->follow(mask(p)));
-    ::walk(m->rootThread, w, o);
+    ::walk(m->rootThread, w, o, 0);
   }
 
   void dispose() {
@@ -1632,8 +1630,8 @@ class HeapClient: public Heap::Client {
 namespace vm {
 
 Machine::Machine(System* system, Heap* heap, Finder* finder,
-                 Processor* processor, const char* bootLibrary,
-                 const char* builtins):
+                 Processor* processor, const char** properties,
+                 unsigned propertyCount):
   vtable(&javaVMVTable),
   system(system),
   heapClient(new (heap->allocate(sizeof(HeapClient)))
@@ -1644,7 +1642,8 @@ Machine::Machine(System* system, Heap* heap, Finder* finder,
   rootThread(0),
   exclusive(0),
   jniReferences(0),
-  builtins(builtins),
+  properties(properties),
+  propertyCount(propertyCount),
   activeCount(0),
   liveCount(0),
   fixedFootprint(0),
@@ -1677,7 +1676,8 @@ Machine::Machine(System* system, Heap* heap, Finder* finder,
       not system->success(system->make(&heapLock)) or
       not system->success(system->make(&classLock)) or
       not system->success(system->make(&referenceLock)) or
-      not system->success(system->load(&libraries, bootLibrary, false)))
+      not system->success
+      (system->load(&libraries, findProperty(this, "avian.bootstrap"), false)))
   {
     system->abort();
   }
@@ -1706,6 +1706,8 @@ Machine::dispose()
     heap->free(heapPool[i], Thread::HeapSizeInBytes);
   }
 
+  heap->free(properties, sizeof(const char*) * propertyCount);
+
   static_cast<HeapClient*>(heapClient)->dispose();
 
   heap->free(this, sizeof(*this));
@@ -2595,12 +2597,14 @@ findInHierarchy(Thread* t, object class_, object name, object spec,
   PROTECT(t, class_);
 
   object o = 0;
-  if (classFlags(t, class_) & ACC_INTERFACE) {
-    if (classVirtualTable(t, class_)) {
-      o = findInTable
-        (t, classVirtualTable(t, class_), name, spec, methodName, methodSpec);
-    }
-  } else {
+  if ((classFlags(t, class_) & ACC_INTERFACE)
+      and classVirtualTable(t, class_))
+  {
+    o = findInTable
+      (t, classVirtualTable(t, class_), name, spec, methodName, methodSpec);
+  }
+
+  if (o == 0) {
     for (; o == 0 and class_; class_ = classSuper(t, class_)) {
       o = find(t, class_, name, spec);
     }
@@ -2765,6 +2769,44 @@ collect(Thread* t, Heap::CollectionType type)
 #endif
 }
 
+int
+walkNext(Thread* t, object o, int previous)
+{
+  class Walker: public Heap::Walker {
+   public:
+    Walker(): value(-1) { }
+
+    bool visit(unsigned offset) {
+      value = offset;
+      return false;
+    }
+
+    int value;
+  } walker;
+
+  walk(t, &walker, o, previous + 1);
+  return walker.value;
+}
+
+void
+visitRoots(Machine* m, Heap::Visitor* v)
+{
+  v->visit(&(m->loader));
+  v->visit(&(m->bootstrapClassMap));
+  v->visit(&(m->monitorMap));
+  v->visit(&(m->stringMap));
+  v->visit(&(m->types));
+  v->visit(&(m->jniMethodTable));
+
+  for (Reference* r = m->jniReferences; r; r = r->next) {
+    v->visit(&(r->target));
+  }
+
+  for (Thread* t = m->rootThread; t; t = t->peer) {
+    ::visitRoots(t, v);
+  }
+}
+
 void
 printTrace(Thread* t, object exception)
 {
diff --git a/src/machine.h b/src/machine.h
index 7e4f235979..2dab96f273 100644
--- a/src/machine.h
+++ b/src/machine.h
@@ -1138,7 +1138,7 @@ class Machine {
   };
 
   Machine(System* system, Heap* heap, Finder* finder, Processor* processor,
-          const char* bootLibrary, const char* builtins);
+          const char** properties, unsigned propertyCount);
 
   ~Machine() { 
     dispose();
@@ -1159,7 +1159,8 @@ class Machine {
   Thread* rootThread;
   Thread* exclusive;
   Reference* jniReferences;
-  const char* builtins;
+  const char** properties;
+  unsigned propertyCount;
   unsigned activeCount;
   unsigned liveCount;
   unsigned fixedFootprint;
@@ -1227,7 +1228,7 @@ class Thread {
       t->protector = this;
     }
 
-    virtual ~Protector() {
+    ~Protector() {
       t->protector = next;
     }
 
@@ -1526,6 +1527,29 @@ setObjectClass(Thread*, object o, object value)
      | (reinterpret_cast<uintptr_t>(cast<object>(o, 0)) & (~PointerMask)));
 }
 
+inline const char*
+findProperty(Machine* m, const char* name)
+{
+  for (unsigned i = 0; i < m->propertyCount; ++i) {
+    const char* p = m->properties[i];
+    const char* n = name;
+    while (*p and *p != '=' and *n and *p == *n) {
+      ++ p;
+      ++ n;
+    }
+    if (*p == '=' and *n == 0) {
+      return p + 1;
+    }
+  }
+  return 0;
+}
+
+inline const char*
+findProperty(Thread* t, const char* name)
+{
+  return findProperty(t->m, name);
+}
+
 object&
 arrayBodyUnsafe(Thread*, object, unsigned);
 
@@ -2200,6 +2224,12 @@ intern(Thread* t, object s);
 void
 exit(Thread* t);
 
+int
+walkNext(Thread* t, object o, int previous);
+
+void
+visitRoots(Machine* m, Heap::Visitor* v);
+
 inline jobject
 makeLocalReference(Thread* t, object o)
 {
@@ -2293,6 +2323,9 @@ makeSingleton(Thread* t, unsigned count)
   return o;
 }
 
+void
+dumpHeap(Thread* t, FILE* out);
+
 } // namespace vm
 
 void
diff --git a/src/posix.cpp b/src/posix.cpp
index 1afece6113..1291809fa1 100644
--- a/src/posix.cpp
+++ b/src/posix.cpp
@@ -257,9 +257,10 @@ class MySystem: public System {
       Thread* t = static_cast<Thread*>(context);
 
       if (owner_ == t) {
-        bool interrupted;
-        bool notified;
-        unsigned depth;
+        // Initialized here to make gcc 4.2 a happy compiler
+        bool interrupted = false;
+        bool notified = false;
+        unsigned depth = 0;
 
         { ACQUIRE(t->mutex);
       
@@ -820,7 +821,7 @@ handleSignal(int signal, siginfo_t* info, void* context)
 namespace vm {
 
 System*
-makeSystem()
+makeSystem(const char*)
 {
   return new (malloc(sizeof(MySystem))) MySystem();
 }
diff --git a/src/powerpc.cpp b/src/powerpc.cpp
index 3f312c21f0..2c42461726 100644
--- a/src/powerpc.cpp
+++ b/src/powerpc.cpp
@@ -301,8 +301,6 @@ class Task {
  public:
   Task(Task* next): next(next) { }
 
-  virtual ~Task() { }
-
   virtual void run(Context* c) = 0;
 
   Task* next;
diff --git a/src/process.cpp b/src/process.cpp
index ecfac1f2d8..c2693d0281 100644
--- a/src/process.cpp
+++ b/src/process.cpp
@@ -167,8 +167,7 @@ resolveNativeMethod2(Thread* t, object method)
   }
 
 #ifdef __MINGW32__
-  // on windows, we also try the _%s@%d variant, since the SWT
-  // libraries use it.
+  // on windows, we also try the _%s@%d and %s@%d variants
   unsigned footprint = methodParameterFootprint(t, method) + 1;
   if (methodFlags(t, method) & ACC_STATIC) {
     ++ footprint;
@@ -186,6 +185,12 @@ resolveNativeMethod2(Thread* t, object method)
   if (p) {
     return p;
   }
+
+  // one more try without the leading underscore
+  p = ::resolveNativeMethod(t, undecorated + 1, decorated + 1);
+  if (p) {
+    return p;
+  }
 #endif
 
   return 0;
diff --git a/src/processor.h b/src/processor.h
index 459970143e..a0ef3491b2 100644
--- a/src/processor.h
+++ b/src/processor.h
@@ -23,15 +23,11 @@ class Processor {
 
   class StackVisitor {
    public:
-    virtual ~StackVisitor() { }
-
     virtual bool visit(StackWalker* walker) = 0;
   };
 
   class StackWalker {
    public:
-    virtual ~StackWalker() { }
-
     virtual void walk(StackVisitor* v) = 0;
 
     virtual object method() = 0;
@@ -41,8 +37,6 @@ class Processor {
     virtual unsigned count() = 0;
   };
 
-  virtual ~Processor() { }
-
   virtual Thread*
   makeThread(Machine* m, object javaThread, Thread* parent) = 0;
 
diff --git a/src/stream.h b/src/stream.h
index c740d082b1..bf59e41865 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -19,7 +19,6 @@ class Stream {
  public:
   class Client {
    public:
-    virtual ~Client() { }
     virtual void NO_RETURN handleError() = 0;
   };
 
diff --git a/src/system.h b/src/system.h
index 4223451756..10addecdd4 100644
--- a/src/system.h
+++ b/src/system.h
@@ -28,7 +28,6 @@ class System {
 
   class Thread {
    public:
-    virtual ~Thread() { }
     virtual void interrupt() = 0;
     virtual void join() = 0;
     virtual void dispose() = 0;
@@ -36,13 +35,11 @@ class System {
 
   class ThreadVisitor {
    public:
-    virtual ~ThreadVisitor() { }
     virtual void visit(void* ip, void* base, void* stack) = 0;
   };
 
   class Runnable {
    public:
-    virtual ~Runnable() { }
     virtual void attach(Thread*) = 0;
     virtual void run() = 0;
     virtual bool interrupted() = 0;
@@ -51,7 +48,6 @@ class System {
 
   class Mutex {
    public:
-    virtual ~Mutex() { }
     virtual void acquire() = 0;
     virtual void release() = 0;
     virtual void dispose() = 0;
@@ -59,7 +55,6 @@ class System {
 
   class Monitor {
    public:
-    virtual ~Monitor() { }
     virtual bool tryAcquire(Thread* context) = 0;
     virtual void acquire(Thread* context) = 0;
     virtual void release(Thread* context) = 0;
@@ -72,7 +67,6 @@ class System {
 
   class Local {
    public:
-    virtual ~Local() { }
     virtual void* get() = 0;
     virtual void set(void* p) = 0;
     virtual void dispose() = 0;
@@ -80,7 +74,6 @@ class System {
 
   class Region {
    public:
-    virtual ~Region() { }
     virtual const uint8_t* start() = 0;
     virtual size_t length() = 0;
     virtual void dispose() = 0;
@@ -88,7 +81,6 @@ class System {
 
   class Library {
    public:
-    virtual ~Library() { }
     virtual void* resolve(const char* function) = 0;
     virtual const char* name() = 0;
     virtual bool mapName() = 0;
@@ -99,8 +91,6 @@ class System {
 
   class SignalHandler {
    public:
-    virtual ~SignalHandler() { }
-
     virtual bool handleSignal(void** ip, void** base, void** stack,
                               void** thread) = 0;
   };
@@ -120,8 +110,6 @@ class System {
     System::Monitor* m;
   };
 
-  virtual ~System() { }
-
   virtual bool success(Status) = 0;
   virtual void* tryAllocate(unsigned sizeInBytes) = 0;
   virtual void free(const void* p) = 0;
@@ -193,7 +181,7 @@ assert(System* s, bool v)
 #endif // not NDEBUG
 
 System*
-makeSystem();
+makeSystem(const char* crashDumpDirectory);
 
 } // namespace vm
 
diff --git a/src/type-generator.cpp b/src/type-generator.cpp
index 231e31fb56..34a79ee5e6 100644
--- a/src/type-generator.cpp
+++ b/src/type-generator.cpp
@@ -371,7 +371,6 @@ class Scalar : public Object {
   unsigned elementSize;
   bool noassert;
   bool nogc;
-  bool hide;
 
   static Scalar* make(Object* owner, Object* typeObject, const char* typeName,
                       const char* name, unsigned size)
@@ -385,7 +384,6 @@ class Scalar : public Object {
     o->elementSize = size;
     o->noassert = false;
     o->nogc = false;
-    o->hide = false;
     return o;
   }
 };
@@ -527,19 +525,6 @@ memberGC(Object* o)
   return not memberNoGC(o) and equal(memberTypeName(o), "object");
 }
 
-bool&
-memberHide(Object* o)
-{
-  switch (o->type) {
-  case Object::Scalar:
-  case Object::Array:
-    return static_cast<Scalar*>(o)->hide;
-
-  default:
-    UNREACHABLE;
-  }
-}
-
 class Method : public Object {
  public:
   Object* owner;
@@ -588,7 +573,6 @@ class Type : public Object {
   Object* super;
   List members;
   List methods;
-  bool hideConstructor;
   bool overridesMethods;
 
   static Type* make(Object::ObjectType type, const char* name,
@@ -601,7 +585,6 @@ class Type : public Object {
     o->super = 0;
     o->members.first = o->members.last = 0;
     o->methods.first = o->methods.last = 0;
-    o->hideConstructor = false;
     o->overridesMethods = false;
     return o;
   }  
@@ -718,18 +701,6 @@ typeSuper(Object* o)
   }
 }
 
-bool&
-typeHideConstructor(Object* o)
-{
-  switch (o->type) {
-  case Object::Type:
-    return static_cast<Type*>(o)->hideConstructor;
-
-  default:
-    UNREACHABLE;
-  }
-}
-
 class Number : public Object {
  public:
   unsigned value;
@@ -1141,15 +1112,7 @@ void
 parseSubdeclaration(Object* t, Object* p, Object* declarations)
 {
   const char* front = string(car(p));
-  if (equal(front, "hide")) {
-    if (equal(string(car(cdr(p))), "constructor")) {
-      typeHideConstructor(t) = true;
-    } else {
-      Object* member = parseMember(t, cdr(p), declarations);
-      memberHide(member) = true;
-      addMember(t, member);
-    }
-  } else if (equal(front, "extends")) {
+  if (equal(front, "extends")) {
     assert(t->type == Object::Type);
     assert(typeSuper(t) == 0);
     typeSuper(t) = declaration(string(car(cdr(p))), declarations);
@@ -1169,8 +1132,7 @@ memberEqual(Object* a, Object* b)
     case Object::Scalar:
       return equal(memberTypeName(a), memberTypeName(b))
         and memberNoAssert(a) == memberNoAssert(b)
-        and memberNoGC(a) == memberNoGC(b)
-        and memberHide(a) == memberHide(b);
+        and memberNoGC(a) == memberNoGC(b);
 
       // todo: compare array fields
 
@@ -1468,8 +1430,7 @@ parse(Input* in, const char* javaClassDirectory)
 }
 
 void
-writeAccessorName(Output* out, Object* member, bool respectHide = false,
-                  bool unsafe = false)
+writeAccessorName(Output* out, Object* member, bool unsafe = false)
 {
   const char* owner = typeName(memberOwner(member));
   out->write(owner);
@@ -1477,9 +1438,6 @@ writeAccessorName(Output* out, Object* member, bool respectHide = false,
   if (unsafe) {
     out->write("Unsafe");
   }
-  if (respectHide and memberHide(member)) {
-    out->write("0");
-  }
 }
 
 void
@@ -1557,7 +1515,7 @@ writeAccessor(Output* out, Object* member, Object* offset, bool unsafe = false)
   }
 
   out->write("\n");
-  writeAccessorName(out, member, true, unsafe);
+  writeAccessorName(out, member, unsafe);
   if (memberOwner(member)->type == Object::Pod) {
     out->write("(");
     out->write(capitalize(::typeName(memberOwner(member))));
@@ -1876,7 +1834,7 @@ writeConstructorInitializations(Output* out, Object* t)
     switch (m->type) {
     case Object::Scalar: {
       out->write("  ");
-      writeAccessorName(out, m, true);
+      writeAccessorName(out, m);
       out->write("(t, o) = ");
       out->write(obfuscate(memberName(m)));
       out->write(";\n");
@@ -1887,7 +1845,7 @@ writeConstructorInitializations(Output* out, Object* t)
       if (memberTypeObject(m) == 0) {
         out->write("&");
       }
-      writeAccessorName(out, m, true);
+      writeAccessorName(out, m);
       out->write("(t, o, 0), 0, length * ");
       out->write(arrayElementSize(m));
       out->write(");\n");
@@ -1914,7 +1872,6 @@ writeInitializerDeclarations(Output* out, Object* declarations)
     case Object::Type: {
       out->write("void init");
       out->write(capitalize(typeName(o)));
-      if (typeHideConstructor(o)) out->write("0");
       out->write("(Thread* t, object o");
       
       writeConstructorParameters(out, o);
@@ -1936,7 +1893,6 @@ writeConstructorDeclarations(Output* out, Object* declarations)
     case Object::Type: {
       out->write("object make");
       out->write(capitalize(typeName(o)));
-      if (typeHideConstructor(o)) out->write("0");
       out->write("(Thread* t");
       
       writeConstructorParameters(out, o);
@@ -1958,7 +1914,6 @@ writeInitializers(Output* out, Object* declarations)
     case Object::Type: {
       out->write("void\ninit");
       out->write(capitalize(typeName(o)));
-      if (typeHideConstructor(o)) out->write("0");
       out->write("(Thread* t, object o");
       
       writeConstructorParameters(out, o);
@@ -1989,7 +1944,6 @@ writeConstructors(Output* out, Object* declarations)
     case Object::Type: {
       out->write("object make");
       out->write(capitalize(typeName(o)));
-      if (typeHideConstructor(o)) out->write("0");
       out->write("(Thread* t");
       
       writeConstructorParameters(out, o);
@@ -2027,7 +1981,6 @@ writeConstructors(Output* out, Object* declarations)
 
       out->write("  init");
       out->write(capitalize(typeName(o)));
-      if (typeHideConstructor(o)) out->write("0");
       out->write("(t, o");
       writeConstructorArguments(out, o);
       out->write(");\n");
diff --git a/src/windows.cpp b/src/windows.cpp
index 9d2cb6b58c..de295d90b0 100644
--- a/src/windows.cpp
+++ b/src/windows.cpp
@@ -10,6 +10,7 @@
 
 #include "sys/stat.h"
 #include "windows.h"
+#include "sys/timeb.h"
 
 #undef max
 #undef min
@@ -40,25 +41,11 @@ class MutexResource {
   HANDLE m;
 };
 
-System::SignalHandler* segFaultHandler = 0;
-LPTOP_LEVEL_EXCEPTION_FILTER oldSegFaultHandler = 0;
+class MySystem;
+MySystem* system;
 
 LONG CALLBACK
-handleException(LPEXCEPTION_POINTERS e)
-{
-  if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION) {
-    bool jump = segFaultHandler->handleSignal
-      (reinterpret_cast<void**>(&(e->ContextRecord->Eip)),
-       reinterpret_cast<void**>(&(e->ContextRecord->Ebp)),
-       reinterpret_cast<void**>(&(e->ContextRecord->Esp)),
-       reinterpret_cast<void**>(&(e->ContextRecord->Ebx)));
-
-    if (jump) {
-      return EXCEPTION_CONTINUE_EXECUTION;
-    }
-  }
-  return EXCEPTION_CONTINUE_SEARCH;
-}
+handleException(LPEXCEPTION_POINTERS e);
 
 DWORD WINAPI
 run(void* r)
@@ -495,7 +482,14 @@ class MySystem: public System {
     System::Library* next_;
   };
 
-  MySystem() {
+  MySystem(const char* crashDumpDirectory):
+    segFaultHandler(0),
+    oldSegFaultHandler(0),
+    crashDumpDirectory(crashDumpDirectory)
+  {
+    expect(this, system == 0);
+    system = this;
+
     mutex = CreateMutex(0, false, 0);
     assert(this, mutex);
   }
@@ -721,26 +715,116 @@ class MySystem: public System {
   }
 
   virtual void abort() {
-    asm("int3");
-    ::abort();
+    // trigger an EXCEPTION_ACCESS_VIOLATION, which we will catch and
+    // generate a debug dump for
+    *static_cast<int*>(0) = 0;
   }
 
   virtual void dispose() {
+    system = 0;
     CloseHandle(mutex);
     ::free(this);
   }
 
   HANDLE mutex;
+  System::SignalHandler* segFaultHandler;
+  LPTOP_LEVEL_EXCEPTION_FILTER oldSegFaultHandler;
+  const char* crashDumpDirectory;
 };
 
+struct MINIDUMP_EXCEPTION_INFORMATION {
+  DWORD thread;
+  LPEXCEPTION_POINTERS exception;
+  BOOL exceptionInCurrentAddressSpace;
+};
+
+struct MINIDUMP_USER_STREAM_INFORMATION;
+struct MINIDUMP_CALLBACK_INFORMATION;
+
+enum MINIDUMP_TYPE {
+  MiniDumpNormal = 0
+};
+
+typedef BOOL (*MiniDumpWriteDumpType)
+(HANDLE processHandle,
+ DWORD processId,
+ HANDLE file,
+ MINIDUMP_TYPE type,
+ const MINIDUMP_EXCEPTION_INFORMATION* exception,
+ const MINIDUMP_USER_STREAM_INFORMATION* userStream,
+ const MINIDUMP_CALLBACK_INFORMATION* callback);
+
+void
+dump(LPEXCEPTION_POINTERS e, const char* directory)
+{
+  HINSTANCE dbghelp = LoadLibrary("dbghelp.dll");
+
+  if (dbghelp) {
+    MiniDumpWriteDumpType MiniDumpWriteDump = reinterpret_cast
+      <MiniDumpWriteDumpType>(GetProcAddress(dbghelp, "MiniDumpWriteDump"));
+
+    if (MiniDumpWriteDump) {
+      char name[MAX_PATH];
+      _timeb tb;
+      _ftime(&tb);
+      snprintf(name, MAX_PATH, "%s\\crash-%lld.mdmp", directory,
+               (static_cast<int64_t>(tb.time) * 1000)
+               + static_cast<int64_t>(tb.millitm));
+
+      HANDLE file = CreateFile
+        (name, FILE_WRITE_DATA, 0, 0, CREATE_ALWAYS, 0, 0);
+
+      if (file != INVALID_HANDLE_VALUE) {
+        MINIDUMP_EXCEPTION_INFORMATION exception
+          = { GetCurrentThreadId(), e, true };
+
+        MiniDumpWriteDump
+          (GetCurrentProcess(),
+           GetCurrentProcessId(),
+           file,
+           MiniDumpNormal,
+           &exception,
+           0,
+           0);
+
+        CloseHandle(file);
+      }
+    }
+
+    FreeLibrary(dbghelp);
+  }
+}
+
+LONG CALLBACK
+handleException(LPEXCEPTION_POINTERS e)
+{
+  if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION) {
+    bool jump = system->segFaultHandler->handleSignal
+      (reinterpret_cast<void**>(&(e->ContextRecord->Eip)),
+       reinterpret_cast<void**>(&(e->ContextRecord->Ebp)),
+       reinterpret_cast<void**>(&(e->ContextRecord->Esp)),
+       reinterpret_cast<void**>(&(e->ContextRecord->Ebx)));
+
+    if (jump) {
+      return EXCEPTION_CONTINUE_EXECUTION;
+    }
+  }
+
+  if (system->crashDumpDirectory) {
+    dump(e, system->crashDumpDirectory);
+  }
+
+  return EXCEPTION_CONTINUE_SEARCH;
+}
+
 } // namespace
 
 namespace vm {
 
 System*
-makeSystem()
+makeSystem(const char* crashDumpDirectory)
 {
-  return new (malloc(sizeof(MySystem))) MySystem();
+  return new (malloc(sizeof(MySystem))) MySystem(crashDumpDirectory);
 }
 
 } // namespace vm
diff --git a/src/x86.cpp b/src/x86.cpp
index 3b01573a74..6028d33b1d 100644
--- a/src/x86.cpp
+++ b/src/x86.cpp
@@ -216,8 +216,6 @@ class Task {
  public:
   Task(Task* next): next(next) { }
 
-  virtual ~Task() { }
-
   virtual void run(Context* c) = 0;
 
   Task* next;
diff --git a/test/Zip.java b/test/Zip.java
new file mode 100644
index 0000000000..b18d5f1a0b
--- /dev/null
+++ b/test/Zip.java
@@ -0,0 +1,26 @@
+import java.io.InputStream;
+import java.util.Enumeration;
+import java.util.zip.ZipFile;
+import java.util.zip.ZipEntry;
+
+public class Zip {
+  
+  public static void main(String[] args) throws Exception {
+    ZipFile file = new ZipFile("build/classpath.jar");
+
+    byte[] buffer = new byte[4096];
+    for (Enumeration<ZipEntry> e = file.entries(); e.hasMoreElements();) {
+      ZipEntry entry = e.nextElement();
+      InputStream in = file.getInputStream(entry);
+      try {
+        int size = 0;
+        int c; while ((c = in.read(buffer)) != -1) size += c;
+        System.out.println
+          (entry.getName() + " " + entry.getCompressedSize() + " " + size);
+      } finally {
+        in.read();
+      }
+    }
+  }
+
+}
diff --git a/test/test.sh b/test/test.sh
index cfd03fe2df..fd028e39f0 100644
--- a/test/test.sh
+++ b/test/test.sh
@@ -17,7 +17,7 @@ for test in ${tests}; do
   printf "%16s" "${test}: "
 
   case ${mode} in
-    debug|debug-fast|fast )
+    debug|debug-fast|fast|small )
       ${vm} ${flags} ${test} >>${log} 2>&1;;
 
     stress* )