diff --git a/classpath/java-util-zip.cpp b/classpath/java-util-zip.cpp
index 9ae2833332..6fb471bdfd 100644
--- a/classpath/java-util-zip.cpp
+++ b/classpath/java-util-zip.cpp
@@ -76,7 +76,9 @@ Java_java_util_zip_Inflater_inflate
 
   int r = inflate(s, Z_SYNC_FLUSH);
   jint resultArray[3]
-    = { r, inputLength - s->avail_in, outputLength - s->avail_out };
+    = { r,
+        static_cast<jint>(inputLength - s->avail_in),
+        static_cast<jint>(outputLength - s->avail_out) };
 
   free(in);
 
@@ -147,7 +149,9 @@ Java_java_util_zip_Deflater_deflate
 
   int r = deflate(s, finish ? Z_FINISH : Z_NO_FLUSH);
   jint resultArray[3]
-    = { r, inputLength - s->avail_in, outputLength - s->avail_out };
+    = { r,
+        static_cast<jint>(inputLength - s->avail_in),
+        static_cast<jint>(outputLength - s->avail_out) };
 
   free(in);
 
diff --git a/classpath/jni-util.h b/classpath/jni-util.h
index 4973891704..57e545a14b 100644
--- a/classpath/jni-util.h
+++ b/classpath/jni-util.h
@@ -73,8 +73,6 @@ typedef unsigned __int64 uint64_t;
 
 #endif // not _MSC_VER
 
-namespace {
-
 inline void
 throwNew(JNIEnv* e, const char* class_, const char* message, ...)
 {
@@ -149,7 +147,4 @@ class RuntimeArray {
 
 #endif // not _MSC_VER
 
-
-} // namespace
-
 #endif//JNI_UTIL
diff --git a/makefile b/makefile
index 42ef1b95e7..6e5f439d2f 100755
--- a/makefile
+++ b/makefile
@@ -1,7 +1,7 @@
 MAKEFLAGS = -s
 
 name = avian
-version = 0.5
+version = 0.6
 
 build-arch := $(shell uname -m \
 	| sed 's/^i.86$$/i386/' \
@@ -33,6 +33,9 @@ endif
 ifneq ($(mode),fast)
 	options := $(options)-$(mode)
 endif
+ifneq ($(lzma),)
+	options := $(options)-lzma
+endif
 ifeq ($(bootimage),true)
 	options := $(options)-bootimage
 endif
@@ -68,6 +71,8 @@ ifeq ($(build-platform),cygwin)
 	native-path = cygpath -m
 endif
 
+windows-path = echo
+
 path-separator = :
 
 ifneq (,$(filter mingw32 cygwin,$(build-platform)))
@@ -138,8 +143,13 @@ endif
 
 input = List
 
-build-cxx = g++
-build-cc = gcc
+ifeq ($(use-clang),true)
+	build-cxx = clang -std=c++11
+	build-cc = clang
+else
+	build-cxx = g++
+	build-cc = gcc
+endif
 
 mflag =
 ifneq ($(platform),darwin)
@@ -195,7 +205,8 @@ build-cflags = $(common-cflags) -fPIC -fvisibility=hidden \
 converter-cflags = -D__STDC_CONSTANT_MACROS -Isrc/binaryToObject -Isrc/ \
 	-fno-rtti -fno-exceptions \
 	-DAVIAN_TARGET_ARCH=AVIAN_ARCH_UNKNOWN \
-	-DAVIAN_TARGET_PLATFORM=AVIAN_PLATFORM_UNKNOWN
+	-DAVIAN_TARGET_PLATFORM=AVIAN_PLATFORM_UNKNOWN \
+	-Wall -Wextra -Werror -Wunused-parameter -Winit-self -Wno-non-virtual-dtor
 
 cflags = $(build-cflags)
 
@@ -219,6 +230,8 @@ so-suffix = .so
 
 shared = -shared
 
+no-error = -Wno-error
+
 openjdk-extra-cflags = -fvisibility=hidden
 
 bootimage-cflags = -DTARGET_BYTES_PER_WORD=$(pointer-size)
@@ -313,8 +326,12 @@ ifeq ($(platform),darwin)
 	endif
 
 	version-script-flag =
-	lflags = $(common-lflags) -ldl -framework CoreFoundation \
-		-Wl,-compatibility_version,1.0.0
+	lflags = $(common-lflags) -ldl -framework CoreFoundation
+
+	ifeq (,$(shell ld -v 2>&1 | grep cctools))
+		lflags += -Wl,-compatibility_version,1.0.0
+	endif
+
 	ifneq ($(arch),arm)
 		lflags +=	-framework CoreServices -framework SystemConfiguration \
 			-framework Security
@@ -446,23 +463,36 @@ ifeq ($(mode),stress-major)
 	strip = :
 endif
 ifeq ($(mode),fast)
-	optimization-cflags = -O3 -g3 -DNDEBUG
+	ifeq ($(use-clang),true)
+		optimization-cflags = -O4 -g3 -DNDEBUG
+	else
+		optimization-cflags = -O3 -g3 -DNDEBUG
+	endif
 	use-lto = true
 endif
 ifeq ($(mode),small)
-	optimization-cflags = -Os -g3 -DNDEBUG
+	ifeq ($(use-clang),true)
+		optimization-cflags = -Oz -g3 -DNDEBUG
+	else
+		optimization-cflags = -Os -g3 -DNDEBUG
+	endif
 	use-lto = true
 endif
 
 ifeq ($(use-lto),true)
-# only try to use LTO when GCC 4.6.0 or greater is available
-	gcc-major := $(shell $(cc) -dumpversion | cut -f1 -d.)
-	gcc-minor := $(shell $(cc) -dumpversion | cut -f2 -d.)
-	ifeq ($(shell expr 4 \< $(gcc-major) \
-			\| \( 4 \<= $(gcc-major) \& 6 \<= $(gcc-minor) \)),1)
+	ifeq ($(use-clang),true)
 		optimization-cflags += -flto
-		no-lto = -fno-lto
 		lflags += $(optimization-cflags)
+	else
+# only try to use LTO when GCC 4.6.0 or greater is available
+		gcc-major := $(shell $(cc) -dumpversion | cut -f1 -d.)
+		gcc-minor := $(shell $(cc) -dumpversion | cut -f2 -d.)
+		ifeq ($(shell expr 4 \< $(gcc-major) \
+				\| \( 4 \<= $(gcc-major) \& 6 \<= $(gcc-minor) \)),1)
+			optimization-cflags += -flto
+			no-lto = -fno-lto
+			lflags += $(optimization-cflags)
+		endif
 	endif
 endif
 
@@ -482,8 +512,10 @@ ld := $(cc)
 build-ld := $(build-cc)
 
 ifdef msvc
-	windows-java-home := $(shell cygpath -m "$(JAVA_HOME)")
-	zlib := $(shell cygpath -m "$(win32)/msvc")
+	no-error =
+	windows-path = $(native-path)
+	windows-java-home := $(shell $(windows-path) "$(JAVA_HOME)")
+	zlib := $(shell $(windows-path) "$(win32)/msvc")
 	cxx = "$(msvc)/BIN/cl.exe"
 	cc = $(cxx)
 	ld = "$(msvc)/BIN/link.exe"
@@ -494,6 +526,11 @@ ifdef msvc
 		-Fd$(build)/$(name).pdb -I"$(zlib)/include" -I$(src) -I"$(build)" \
 		-I"$(windows-java-home)/include" -I"$(windows-java-home)/include/win32" \
 		-DTARGET_BYTES_PER_WORD=$(pointer-size)
+
+  ifneq ($(lzma),)
+		cflags += -I$(shell $(windows-path) "$(lzma)")
+	endif
+
 	shared = -dll
 	lflags = -nologo -LIBPATH:"$(zlib)/lib" -DEFAULTLIB:ws2_32 \
 		-DEFAULTLIB:zlib -MANIFEST -debug
@@ -517,6 +554,7 @@ ifdef msvc
 	strip = :
 endif
 
+c-objects = $(foreach x,$(1),$(patsubst $(2)/%.c,$(3)/%.o,$(x)))
 cpp-objects = $(foreach x,$(1),$(patsubst $(2)/%.cpp,$(3)/%.o,$(x)))
 asm-objects = $(foreach x,$(1),$(patsubst $(2)/%.S,$(3)/%-asm.o,$(x)))
 java-classes = $(foreach x,$(1),$(patsubst $(2)/%.java,$(3)/%.class,$(x)))
@@ -579,7 +617,10 @@ ifeq ($(continuations),true)
 	asmflags += -DAVIAN_CONTINUATIONS
 endif
 
-bootimage-generator-sources = $(src)/bootimage.cpp 
+bootimage-generator-sources = $(src)/bootimage.cpp
+ifneq ($(lzma),)
+	bootimage-generator-sources += $(src)/lzma-encode.cpp
+endif
 bootimage-generator-objects = \
 	$(call cpp-objects,$(bootimage-generator-sources),$(src),$(build))
 bootimage-generator = $(build)/bootimage-generator
@@ -614,17 +655,62 @@ generator-sources = \
 	$(src)/type-generator.cpp \
 	$(src)/$(build-system).cpp \
 	$(src)/finder.cpp
+
+ifneq ($(lzma),)
+	common-cflags += -I$(lzma) -DAVIAN_USE_LZMA -D_7ZIP_ST
+
+	vm-sources += \
+		$(src)/lzma-decode.cpp
+
+	generator-sources += \
+		$(src)/lzma-decode.cpp
+
+	lzma-decode-sources = \
+		$(lzma)/C/LzmaDec.c
+
+	lzma-decode-objects = \
+		$(call c-objects,$(lzma-decode-sources),$(lzma)/C,$(build))
+
+	lzma-encode-sources = \
+		$(lzma)/C/LzmaEnc.c \
+		$(lzma)/C/LzFind.c
+
+	lzma-encode-objects = \
+		$(call c-objects,$(lzma-encode-sources),$(lzma)/C,$(build))
+
+	lzma-encoder = $(build)/lzma/lzma
+
+	lzma-encoder-cflags = -D__STDC_CONSTANT_MACROS -fno-rtti -fno-exceptions \
+		-I$(lzma)/C
+
+	lzma-encoder-sources = \
+		$(src)/lzma/main.cpp
+
+	lzma-encoder-objects = \
+		$(call cpp-objects,$(lzma-encoder-sources),$(src),$(build))
+
+	lzma-encoder-lzma-sources = $(lzma-encode-sources) $(lzma-decode-sources)
+
+	lzma-encoder-lzma-objects = \
+		$(call generator-c-objects,$(lzma-encoder-lzma-sources),$(lzma)/C,$(build))
+
+	lzma-loader = $(build)/lzma/load.o
+endif
+
 generator-cpp-objects = \
 	$(foreach x,$(1),$(patsubst $(2)/%.cpp,$(3)/%-build.o,$(x)))
+generator-c-objects = \
+	$(foreach x,$(1),$(patsubst $(2)/%.c,$(3)/%-build.o,$(x)))
 generator-objects = \
 	$(call generator-cpp-objects,$(generator-sources),$(src),$(build))
+generator-lzma-objects = \
+	$(call generator-c-objects,$(lzma-decode-sources),$(lzma)/C,$(build))
 generator = $(build)/generator
 
 converter-depends = \
 	$(src)/binaryToObject/tools.h \
 	$(src)/binaryToObject/endianness.h
 
-
 converter-sources = \
 	$(src)/binaryToObject/tools.cpp \
 	$(src)/binaryToObject/elf.cpp \
@@ -745,8 +831,9 @@ test-flags = -cp $(build)/test
 test-args = $(test-flags) $(input)
 
 .PHONY: build
-build: $(static-library) $(executable) $(dynamic-library) \
-	$(executable-dynamic) $(classpath-dep) $(test-dep) $(test-extra-dep)
+build: $(static-library) $(executable) $(dynamic-library) $(lzma-loader) \
+	$(lzma-encoder) $(executable-dynamic) $(classpath-dep) $(test-dep) \
+	$(test-extra-dep)
 
 $(test-dep): $(classpath-dep)
 
@@ -836,7 +923,7 @@ $(test-extra-dep): $(test-extra-sources)
 define compile-object
 	@echo "compiling $(@)"
 	@mkdir -p $(dir $(@))
-	$(cxx) $(cflags) -c $(<) $(call output,$(@))
+	$(cxx) $(cflags) -c $$($(windows-path) $(<)) $(call output,$(@))
 endef
 
 define compile-asm-object
@@ -848,6 +935,11 @@ endef
 $(vm-cpp-objects): $(build)/%.o: $(src)/%.cpp $(vm-depends)
 	$(compile-object)
 
+$(build)/%.o: $(lzma)/C/%.c
+	@echo "compiling $(@)"
+	@mkdir -p $(dir $(@))
+	$(cxx) $(cflags) $(no-error) -c $$($(windows-path) $(<)) $(call output,$(@))
+
 $(vm-asm-objects): $(build)/%-asm.o: $(src)/%.S
 	$(compile-asm-object)
 
@@ -879,6 +971,16 @@ $(converter-objects) $(converter-tool-objects): $(build)/binaryToObject/%.o: $(s
 $(converter): $(converter-objects) $(converter-tool-objects)
 	$(build-cc) $(^) -g -o $(@)
 
+$(lzma-encoder-objects): $(build)/lzma/%.o: $(src)/lzma/%.cpp
+	@mkdir -p $(dir $(@))
+	$(build-cxx) $(lzma-encoder-cflags) -c $(<) -o $(@)
+
+$(lzma-encoder): $(lzma-encoder-objects) $(lzma-encoder-lzma-objects)
+	$(build-cc) $(^) -g -o $(@)
+
+$(lzma-loader): $(src)/lzma/load.cpp
+	$(compile-object)
+
 $(build)/classpath.jar: $(classpath-dep) $(classpath-jar-dep)
 	@echo "creating $(@)"
 	(wd=$$(pwd) && \
@@ -901,18 +1003,28 @@ $(javahome-object): $(build)/javahome.jar $(converter)
 	$(converter) $(<) $(@) _binary_javahome_jar_start \
 		_binary_javahome_jar_end $(platform) $(arch)
 
-$(generator-objects): $(generator-depends)
-$(generator-objects): $(build)/%-build.o: $(src)/%.cpp
+define compile-generator-object
 	@echo "compiling $(@)"
 	@mkdir -p $(dir $(@))
 	$(build-cxx) -DPOINTER_SIZE=$(pointer-size) -O0 -g3 $(build-cflags) \
 		-c $(<) -o $(@)
+endef
+
+$(generator-objects): $(generator-depends)
+$(generator-objects): $(build)/%-build.o: $(src)/%.cpp
+	$(compile-generator-object)
+
+$(build)/%-build.o: $(lzma)/C/%.c
+	@echo "compiling $(@)"
+	@mkdir -p $(dir $(@))
+	$(build-cxx) -DPOINTER_SIZE=$(pointer-size) -O0 -g3 $(build-cflags) \
+		$(no-error) -c $(<) -o $(@)
 
 $(jni-objects): $(build)/%.o: $(classpath-src)/%.cpp
 	$(compile-object)
 
 $(static-library): $(vm-objects) $(classpath-objects) $(vm-heapwalk-objects) \
-		$(javahome-object) $(boot-javahome-object)
+		$(javahome-object) $(boot-javahome-object) $(lzma-decode-objects)
 	@echo "creating $(@)"
 	rm -rf $(@)
 	$(ar) cru $(@) $(^)
@@ -925,7 +1037,7 @@ $(bootimage-object) $(codeimage-object): $(bootimage-generator)
 
 executable-objects = $(vm-objects) $(classpath-objects) $(driver-object) \
 	$(vm-heapwalk-objects) $(boot-object) $(vm-classpath-objects) \
-	$(javahome-object) $(boot-javahome-object)
+	$(javahome-object) $(boot-javahome-object) $(lzma-decode-objects)
 
 $(executable): $(executable-objects)
 	@echo "linking $(@)"
@@ -961,7 +1073,8 @@ $(bootimage-generator): $(bootimage-generator-objects)
 
 $(build-bootimage-generator): \
 		$(vm-objects) $(classpath-object) $(classpath-objects) \
-		$(heapwalk-objects) $(bootimage-generator-objects) $(converter-objects)
+		$(heapwalk-objects) $(bootimage-generator-objects) $(converter-objects) \
+		$(lzma-decode-objects) $(lzma-encode-objects)
 	@echo "linking $(@)"
 ifeq ($(platform),windows)
 ifdef msvc
@@ -979,7 +1092,8 @@ endif
 
 $(dynamic-library): $(vm-objects) $(dynamic-object) $(classpath-objects) \
 		$(vm-heapwalk-objects) $(boot-object) $(vm-classpath-objects) \
-		$(classpath-libraries) $(javahome-object) $(boot-javahome-object)
+		$(classpath-libraries) $(javahome-object) $(boot-javahome-object) \
+		$(lzma-decode-objects)
 	@echo "linking $(@)"
 ifdef msvc
 	$(ld) $(shared) $(lflags) $(^) -out:$(@) -PDB:$(@).pdb \
@@ -1005,7 +1119,7 @@ else
 endif
 	$(strip) $(strip-all) $(@)
 
-$(generator): $(generator-objects)
+$(generator): $(generator-objects) $(generator-lzma-objects)
 	@echo "linking $(@)"
 	$(build-ld) $(^) $(build-lflags) -o $(@)
 
diff --git a/openjdk-src.mk b/openjdk-src.mk
index 027b6a79b5..fbbce2e5e8 100644
--- a/openjdk-src.mk
+++ b/openjdk-src.mk
@@ -239,8 +239,7 @@ ifeq ($(platform),windows)
 		-Ds6_bytes=_s6_bytes
 else
 	openjdk-sources += \
-		$(openjdk-src)/solaris/native/common/jdk_util_md.c \
-		$(openjdk-src)/solaris/native/common/jni_util_md.c \
+		$(shell find $(openjdk-src)/solaris/native/common -name '*.c') \
 		$(openjdk-src)/solaris/native/java/io/canonicalize_md.c \
 		$(openjdk-src)/solaris/native/java/io/Console_md.c \
 		$(openjdk-src)/solaris/native/java/io/FileDescriptor_md.c \
@@ -305,9 +304,6 @@ else
 	ifeq ($(platform),linux)
 		openjdk-sources += \
 			$(openjdk-src)/solaris/native/java/net/linux_close.c \
-			$(openjdk-src)/solaris/native/common/deps/syscalls_fp.c \
-			$(openjdk-src)/solaris/native/common/deps/gconf2/gconf_fp.c \
-			$(openjdk-src)/solaris/native/common/deps/glib2/gio_fp.c \
 			$(openjdk-src)/solaris/native/sun/nio/ch/EPollArrayWrapper.c
 
 		openjdk-headers-classes += \
@@ -316,6 +312,8 @@ else
 		openjdk-cflags += \
 			"-I$(openjdk-src)/solaris/native/common/deps/glib2" \
 			"-I$(openjdk-src)/solaris/native/common/deps/gconf2" \
+			"-I$(openjdk-src)/solaris/native/common/deps/fontconfig2" \
+			"-I$(openjdk-src)/solaris/native/common/deps/gtk2" \
 			$(shell pkg-config --cflags glib-2.0) \
 			$(shell pkg-config --cflags gconf-2.0)
 	endif
@@ -341,12 +339,13 @@ openjdk-local-sources += \
 	$(src)/openjdk/my_net_util.c \
 	$(src)/openjdk/my_management.c
 
-c-objects = $(foreach x,$(1),$(patsubst $(2)/%.c,$(3)/%-openjdk.o,$(x)))
+openjdk-c-objects = \
+	$(foreach x,$(1),$(patsubst $(2)/%.c,$(3)/%-openjdk.o,$(x)))
 
 openjdk-objects = \
-	$(call c-objects,$(openjdk-sources),$(openjdk-src),$(build)/openjdk)
+	$(call openjdk-c-objects,$(openjdk-sources),$(openjdk-src),$(build)/openjdk)
 
 openjdk-local-objects = \
-	$(call c-objects,$(openjdk-local-sources),$(src)/openjdk,$(build)/openjdk)
+	$(call openjdk-c-objects,$(openjdk-local-sources),$(src)/openjdk,$(build)/openjdk)
 
 openjdk-headers-dep = $(build)/openjdk/headers.dep
diff --git a/readme.txt b/readme.txt
index 6c08030677..e9185b2c85 100644
--- a/readme.txt
+++ b/readme.txt
@@ -63,6 +63,7 @@ Build requirements include:
 
   * GNU make 3.80 or later
   * GCC 3.4 or later (4.5.1 or later for Windows/x86_64)
+      or LLVM Clang 3.1 or later (see use-clang option below)
   * JDK 1.5 or later
   * MinGW 3.4 or later (only if compiling for Windows)
   * zlib 1.2.3 or later
@@ -78,11 +79,13 @@ certain flags described below, all of which are optional.
      arch={i386,x86_64,powerpc,arm} \
      process={compile,interpret} \
      mode={debug,debug-fast,fast,small} \
+     lzma=<lzma source directory> \
      ios={true,false} \
      bootimage={true,false} \
      heapdump={true,false} \
      tails={true,false} \
      continuations={true,false} \
+     use-clang={true,false} \
      openjdk=<openjdk installation directory> \
      openjdk-src=<openjdk source directory>
 
@@ -102,11 +105,18 @@ certain flags described below, all of which are optional.
     assertions
       default: fast
 
+  * lzma - if set, support use of LZMA to compress embedded JARs and
+    boot images.  The value of this option should be a directory
+    containing a recent LZMA SDK (available at
+    http://www.7-zip.org/sdk.html).  Currently, only version 9.20 of
+    the SDK has been tested, but other versions might work.
+      default: not set
+
   * ios - if true, cross-compile for iOS on OS X.  Note that
     non-jailbroken iOS devices do not allow JIT compilation, so only
     process=interpret or bootimage=true builds will run on such
-    devices.  See git://oss.readytalk.com/hello-ios.git for an example
-    of an Xcode project for iOS which uses Avian.
+    devices.  See https://github.com/ReadyTalk/hello-ios for an
+    example of an Xcode project for iOS which uses Avian.
       default: false
 
   * bootimage - if true, create a boot image containing the pre-parsed
@@ -134,6 +144,11 @@ certain flags described below, all of which are optional.
     only valid for process=compile builds.
       default: false
 
+  * use-clang - if true, use LLVM's clang instead of GCC to build.
+    Note that this does not currently affect cross compiles, only
+    native builds.
+      default: false
+
   * openjdk - if set, use OpenJDK class library instead of the default
     Avian class library.  See "Building with the OpenJDK Class
     Library" below for details.
@@ -359,8 +374,20 @@ EOF
 
 Step 3: Make an object file out of the jar.
 
- $ ../build/${platform}-${arch}/binaryToObject/binaryToObject boot.jar boot-jar.o \
-     _binary_boot_jar_start _binary_boot_jar_end ${platform} ${arch}
+ $ ../build/${platform}-${arch}/binaryToObject/binaryToObject boot.jar \
+     boot-jar.o _binary_boot_jar_start _binary_boot_jar_end ${platform} ${arch}
+
+If you've built Avian using the lzma option, you may optionally
+compress the jar before generating the object:
+
+ $ ../build/$(platform}-${arch}-lzma/lzma/lzma encode boot.jar boot.jar.lzma
+     && ../build/${platform}-${arch}-lzma/binaryToObject/binaryToObject \
+       boot.jar.lzma boot-jar.o _binary_boot_jar_start _binary_boot_jar_end \
+       ${platform} ${arch}
+
+Note that you'll need to specify "-Xbootclasspath:[lzma:bootJar]"
+instead of "-Xbootclasspath:[bootJar]" in the next step if you've used
+LZMA to compress the jar.
 
 Step 4: Write a driver which starts the VM and runs the desired main
 method.  Note the bootJar function, which will be called by the VM to
diff --git a/src/binaryToObject/elf.cpp b/src/binaryToObject/elf.cpp
index caf7c9c545..b4e0025b02 100644
--- a/src/binaryToObject/elf.cpp
+++ b/src/binaryToObject/elf.cpp
@@ -131,8 +131,9 @@ unsigned getElfPlatform(PlatformInfo::Architecture arch) {
     return EM_ARM;
   case PlatformInfo::PowerPC:
     return EM_PPC;
+  default:
+    return ~0;
   }
-  return ~0;
 }
 
 const char* getSectionName(unsigned accessFlags, unsigned& sectionFlags) {
@@ -255,8 +256,8 @@ public:
     SectionWriter(FileWriter& file):
       file(file),
       name(""),
-      data(0),
-      dataSize(0)
+      dataSize(0),
+      data(0)
     {
       memset(&header, 0, sizeof(SectionHeader));
       file.sectionCount++;
@@ -279,8 +280,8 @@ public:
 
       file(file),
       name(chname),
-      data(data),
-      dataSize(dataSize)
+      dataSize(dataSize),
+      data(data)
     {
       if(strcmp(chname, ".shstrtab") == 0) {
         file.sectionStringTableSectionNumber = file.sectionCount;
@@ -359,11 +360,11 @@ public:
 
     file.writeHeader(out);
 
-    for(int i = 0; i < file.sectionCount; i++) {
+    for(unsigned i = 0; i < file.sectionCount; i++) {
       sections[i].writeHeader(out);
     }
 
-    for(int i = 0; i < file.sectionCount; i++) {
+    for(unsigned i = 0; i < file.sectionCount; i++) {
       sections[i].writeData(out);
     }
 
diff --git a/src/binaryToObject/mach-o.cpp b/src/binaryToObject/mach-o.cpp
index 50d7e56d78..dd89ddb304 100644
--- a/src/binaryToObject/mach-o.cpp
+++ b/src/binaryToObject/mach-o.cpp
@@ -183,14 +183,14 @@ public:
 
     FileHeader header = {
       V4(Magic), // magic
-      V4(cpuType),
-      V4(cpuSubType),
+      static_cast<cpu_type_t>(V4(cpuType)),
+      static_cast<cpu_subtype_t>(V4(cpuSubType)),
       V4(MH_OBJECT), // filetype,
       V4(2), // ncmds
       V4(sizeof(SegmentCommand)
          + sizeof(Section)
          + sizeof(SymtabCommand)), // sizeofcmds
-      V4(0) // flags
+      { V4(0) } // flags
     };
 
     AddrTy finalSize = pad(data.count);
@@ -206,8 +206,8 @@ public:
          + sizeof(Section)
          + sizeof(SymtabCommand))), // fileoff
       VANY(static_cast<AddrTy>(finalSize)), // filesize
-      V4(7), // maxprot
-      V4(7), // initprot
+      static_cast<vm_prot_t>(V4(7)), // maxprot
+      static_cast<vm_prot_t>(V4(7)), // initprot
       V4(1), // nsects
       V4(0) // flags
     };
@@ -243,7 +243,7 @@ public:
       strings.write("_", 1);
       strings.add(sym->name);
       NList symbol = {
-        V4(offset), // n_un
+        { V4(offset) }, // n_un
         V1(N_SECT | N_EXT), // n_type
         V1(1), // n_sect
         V2(0), // n_desc
@@ -281,6 +281,8 @@ public:
     out->writeChunk(symbolList.data, symbolList.length);
 
     out->writeChunk(strings.data, strings.length);
+
+    return true;
   }
     
   MachOPlatform(PlatformInfo::Architecture arch):
diff --git a/src/binaryToObject/main.cpp b/src/binaryToObject/main.cpp
index d8f801a5e3..851a805bec 100644
--- a/src/binaryToObject/main.cpp
+++ b/src/binaryToObject/main.cpp
@@ -33,7 +33,7 @@ void* operator new(size_t size) {
   return malloc(size);
 }
 
-void operator delete(void* mem) { abort(); }
+void operator delete(void*) { abort(); }
 
 namespace {
 
diff --git a/src/binaryToObject/pe.cpp b/src/binaryToObject/pe.cpp
index 32f13cc4fa..69ca719bc1 100644
--- a/src/binaryToObject/pe.cpp
+++ b/src/binaryToObject/pe.cpp
@@ -129,11 +129,11 @@ public:
     void addSymbol(String name, unsigned addr, unsigned sectionNumber, unsigned type, unsigned storageClass) {
       unsigned nameOffset = strings.add(name);
       IMAGE_SYMBOL symbol = {
-        { 0 }, // Name
+        { { 0, 0 } }, // Name
         addr, // Value
-        sectionNumber, // SectionNumber
-        type, // Type
-        storageClass, // StorageClass
+        static_cast<int16_t>(sectionNumber), // SectionNumber
+        static_cast<uint16_t>(type), // Type
+        static_cast<uint8_t>(storageClass), // StorageClass
         0, // NumberOfAuxSymbols
       };
       symbol.N.Name.Long = nameOffset+4;
@@ -165,9 +165,9 @@ public:
         size_t dataSize):
 
       file(file),
-      data(data),
       dataSize(dataSize),
-      finalSize(pad(dataSize))
+      finalSize(pad(dataSize)),
+      data(data)
     {
       file.sectionCount++;
       file.dataStart += sizeof(IMAGE_SECTION_HEADER);
diff --git a/src/bootimage-fields.cpp b/src/bootimage-fields.cpp
index 7638830585..a090268de2 100644
--- a/src/bootimage-fields.cpp
+++ b/src/bootimage-fields.cpp
@@ -5,6 +5,8 @@
 
 FIELD(magic)
 
+FIELD(initialized)
+
 FIELD(heapSize)
 FIELD(codeSize)
 
diff --git a/src/bootimage.cpp b/src/bootimage.cpp
index 17a27f198d..8d403d0745 100644
--- a/src/bootimage.cpp
+++ b/src/bootimage.cpp
@@ -17,6 +17,7 @@
 #include "assembler.h"
 #include "target.h"
 #include "binaryToObject/tools.h"
+#include "lzma.h"
 
 // since we aren't linking against libstdc++, we must implement this
 // ourselves:
@@ -62,14 +63,6 @@ enum Type {
 
 class Field {
  public:
-  Field() { }
-
-  Field(Type type, unsigned buildOffset, unsigned buildSize,
-        unsigned targetOffset, unsigned targetSize):
-    type(type), buildOffset(buildOffset), buildSize(buildSize),
-    targetOffset(targetOffset), targetSize(targetSize)
-  { }
-
   Type type;
   unsigned buildOffset;
   unsigned buildSize;
@@ -77,6 +70,17 @@ class Field {
   unsigned targetSize;
 };
 
+void
+init(Field* f, Type type, unsigned buildOffset, unsigned buildSize,
+     unsigned targetOffset, unsigned targetSize)
+{
+  f->type = type;
+  f->buildOffset = buildOffset;
+  f->buildSize = buildSize;
+  f->targetOffset = targetOffset;
+  f->targetSize = targetSize;
+}
+
 class TypeMap {
  public:
   enum Kind {
@@ -397,9 +401,9 @@ makeCodeImage(Thread* t, Zone* zone, BootImage* image, uint8_t* code,
             map->targetFixedOffsets()[i * BytesPerWord]
               = i * TargetBytesPerWord;
 
-            new (map->fixedFields() + i) Field
-              (types[i], i * BytesPerWord, BytesPerWord,
-               i * TargetBytesPerWord, TargetBytesPerWord);
+            init(new (map->fixedFields() + i) Field, types[i],
+                 i * BytesPerWord, BytesPerWord, i * TargetBytesPerWord,
+                 TargetBytesPerWord);
           }
 
           hashMapInsert
@@ -446,8 +450,8 @@ makeCodeImage(Thread* t, Zone* zone, BootImage* image, uint8_t* code,
             ++ memberIndex;
           }
         } else {
-          new (memberFields) Field
-            (Type_object, 0, BytesPerWord, 0, TargetBytesPerWord);
+          init(new (memberFields) Field, Type_object, 0, BytesPerWord, 0,
+               TargetBytesPerWord);
 
           memberIndex = 1;
           buildMemberOffset = BytesPerWord;
@@ -456,12 +460,11 @@ makeCodeImage(Thread* t, Zone* zone, BootImage* image, uint8_t* code,
 
         Field staticFields[count + 2];
         
-        new (staticFields) Field
-          (Type_object, 0, BytesPerWord, 0, TargetBytesPerWord);
+        init(new (staticFields) Field, Type_object, 0, BytesPerWord, 0,
+             TargetBytesPerWord);
 
-        new (staticFields + 1) Field
-          (Type_intptr_t, BytesPerWord, BytesPerWord, TargetBytesPerWord,
-           TargetBytesPerWord);
+        init(new (staticFields + 1) Field, Type_intptr_t, BytesPerWord,
+             BytesPerWord, TargetBytesPerWord, TargetBytesPerWord);
 
         unsigned staticIndex = 2;
         unsigned buildStaticOffset = BytesPerWord * 2;
@@ -510,9 +513,9 @@ makeCodeImage(Thread* t, Zone* zone, BootImage* image, uint8_t* code,
 
               buildStaticOffset = fieldOffset(t, field);
 
-              new (staticFields + staticIndex) Field
-                (type, buildStaticOffset, buildSize, targetStaticOffset,
-                 targetSize);
+              init(new (staticFields + staticIndex) Field, type,
+                   buildStaticOffset, buildSize, targetStaticOffset,
+                   targetSize);
 
               targetStaticOffset += targetSize;
 
@@ -524,9 +527,9 @@ makeCodeImage(Thread* t, Zone* zone, BootImage* image, uint8_t* code,
 
               buildMemberOffset = fieldOffset(t, field);
 
-              new (memberFields + memberIndex) Field
-                (type, buildMemberOffset, buildSize, targetMemberOffset,
-                 targetSize);
+              init(new (memberFields + memberIndex) Field, type,
+                   buildMemberOffset, buildSize, targetMemberOffset,
+                   targetSize);
 
               targetMemberOffset += targetSize;
 
@@ -693,12 +696,6 @@ makeCodeImage(Thread* t, Zone* zone, BootImage* image, uint8_t* code,
   return constants;
 }
 
-unsigned
-objectSize(Thread* t, object o)
-{
-  return baseSize(t, o, objectClass(t, o));
-}
-
 void
 visitRoots(Thread* t, BootImage* image, HeapWalker* w, object constants)
 {
@@ -1267,12 +1264,6 @@ updateConstants(Thread* t, object constants, HeapMap* heapTable)
   }
 }
 
-unsigned
-offset(object a, uintptr_t* b)
-{
-  return reinterpret_cast<uintptr_t>(b) - reinterpret_cast<uintptr_t>(a);
-}
-
 BootImage::Thunk
 targetThunk(BootImage::Thunk t)
 {
@@ -1285,7 +1276,8 @@ writeBootImage2(Thread* t, OutputStream* bootimageOutput, OutputStream* codeOutp
                 BootImage* image, uint8_t* code, const char* className,
                 const char* methodName, const char* methodSpec,
                 const char* bootimageStart, const char* bootimageEnd,
-                const char* codeimageStart, const char* codeimageEnd)
+                const char* codeimageStart, const char* codeimageEnd,
+                bool useLZMA)
 {
   setRoot(t, Machine::OutOfMemoryError,
           make(t, type(t, Machine::OutOfMemoryErrorType)));
@@ -1347,7 +1339,8 @@ writeBootImage2(Thread* t, OutputStream* bootimageOutput, OutputStream* codeOutp
 
       Field fields[count];
 
-      new (fields) Field(Type_object, 0, BytesPerWord, 0, TargetBytesPerWord);
+      init(new (fields) Field, Type_object, 0, BytesPerWord, 0,
+           TargetBytesPerWord);
 
       unsigned buildOffset = BytesPerWord;
       unsigned targetOffset = TargetBytesPerWord;
@@ -1424,8 +1417,8 @@ writeBootImage2(Thread* t, OutputStream* bootimageOutput, OutputStream* codeOutp
             ++ targetOffset;
           }
 
-          new (fields + j) Field
-            (type, buildOffset, buildSize, targetOffset, targetSize);
+          init(new (fields + j) Field, type, buildOffset, buildSize,
+               targetOffset, targetSize);
 
           buildOffset += buildSize;
           targetOffset += targetSize;
@@ -1603,6 +1596,7 @@ writeBootImage2(Thread* t, OutputStream* bootimageOutput, OutputStream* codeOutp
   heapWalker->dispose();
 
   image->magic = BootImage::Magic;
+  image->initialized = 0;
 
   fprintf(stderr, "class count %d string count %d call count %d\n"
           "heap size %d code size %d\n",
@@ -1665,7 +1659,27 @@ writeBootImage2(Thread* t, OutputStream* bootimageOutput, OutputStream* codeOutp
       SymbolInfo(bootimageData.length, bootimageEnd)
     };
 
-    platform->writeObject(bootimageOutput, Slice<SymbolInfo>(bootimageSymbols, 2), Slice<const uint8_t>(bootimageData.data, bootimageData.length), Platform::Writable, TargetBytesPerWord);
+    uint8_t* bootimage;
+    unsigned bootimageLength;
+    if (useLZMA) {
+#ifdef AVIAN_USE_LZMA
+      bootimage = encodeLZMA(t->m->system, t->m->heap, bootimageData.data,
+                             bootimageData.length, &bootimageLength);
+
+      fprintf(stderr, "compressed heap size %d\n", bootimageLength);
+#else
+      abort(t);
+#endif
+    } else {
+      bootimage = bootimageData.data;
+      bootimageLength = bootimageData.length;
+    }
+
+    platform->writeObject(bootimageOutput, Slice<SymbolInfo>(bootimageSymbols, 2), Slice<const uint8_t>(bootimage, bootimageLength), Platform::Writable, TargetBytesPerWord);
+
+    if (useLZMA) {
+      t->m->heap->free(bootimage, bootimageLength);
+    }
 
     compilationHandler.symbols.add(SymbolInfo(0, codeimageStart));
     compilationHandler.symbols.add(SymbolInfo(image->codeSize, codeimageEnd));
@@ -1693,10 +1707,12 @@ writeBootImage(Thread* t, uintptr_t* arguments)
   const char* bootimageEnd = reinterpret_cast<const char*>(arguments[8]);
   const char* codeimageStart = reinterpret_cast<const char*>(arguments[9]);
   const char* codeimageEnd = reinterpret_cast<const char*>(arguments[10]);
+  bool useLZMA = arguments[11];
 
   writeBootImage2
     (t, bootimageOutput, codeOutput, image, code, className, methodName,
-     methodSpec, bootimageStart, bootimageEnd, codeimageStart, codeimageEnd);
+     methodSpec, bootimageStart, bootimageEnd, codeimageStart, codeimageEnd,
+     useLZMA);
 
   return 1;
 }
@@ -1753,12 +1769,18 @@ bool ArgParser::parse(int ac, const char** av) {
         fprintf(stderr, "expected -parameter\n");
         return false;
       }
+      bool found = false;
       for(Arg* arg = first; arg; arg = arg->next) {
         if(strcmp(arg->name,  &av[i][1]) == 0) {
-          state = arg;
+          found = true;
+          if (arg->desc == 0) {
+            arg->value = "true";
+          } else {
+            state = arg;
+          }
         }
       }
-      if(!state) {
+      if (not found) {
         fprintf(stderr, "unrecognized parameter %s\n", av[i]);
         return false;
       }
@@ -1786,8 +1808,10 @@ void ArgParser::printUsage(const char* exe) {
     const char* lineEnd = arg->next ? " \\" : "";
     if(arg->required) {
       fprintf(stderr, "  -%s\t%s%s\n", arg->name, arg->desc, lineEnd);
-    } else {
+    } else if (arg->desc) {
       fprintf(stderr, "  [-%s\t%s]%s\n", arg->name, arg->desc, lineEnd);
+    } else {
+      fprintf(stderr, "  [-%s]%s\n", arg->name, lineEnd);
     }
   }
 }
@@ -1810,6 +1834,8 @@ public:
   char* codeimageStart;
   char* codeimageEnd;
 
+  bool useLZMA;
+
   bool maybeSplit(const char* src, char*& destA, char*& destB) {
     if(src) {
       const char* split = strchr(src, ':');
@@ -1839,6 +1865,7 @@ public:
     Arg entry(parser, false, "entry", "<class name>[.<method name>[<method spec>]]");
     Arg bootimageSymbols(parser, false, "bootimage-symbols", "<start symbol name>:<end symbol name>");
     Arg codeimageSymbols(parser, false, "codeimage-symbols", "<start symbol name>:<end symbol name>");
+    Arg useLZMA(parser, false, "use-lzma", 0);
 
     if(!parser.parse(ac, av)) {
       parser.printUsage(av[0]);
@@ -1848,6 +1875,7 @@ public:
     this->classpath = classpath.value;
     this->bootimage = bootimage.value;
     this->codeimage = codeimage.value;
+    this->useLZMA = useLZMA.value != 0;
 
     if(entry.value) {
       if(const char* entryClassEnd = strchr(entry.value, '.')) {
@@ -1997,7 +2025,8 @@ main(int ac, const char** av)
     reinterpret_cast<uintptr_t>(args.bootimageStart),
     reinterpret_cast<uintptr_t>(args.bootimageEnd),
     reinterpret_cast<uintptr_t>(args.codeimageStart),
-    reinterpret_cast<uintptr_t>(args.codeimageEnd)
+    reinterpret_cast<uintptr_t>(args.codeimageEnd),
+    static_cast<uintptr_t>(args.useLZMA)
   };
 
   run(t, writeBootImage, arguments);
diff --git a/src/classpath-openjdk.cpp b/src/classpath-openjdk.cpp
index fe9dbfdbfb..e05a71260e 100644
--- a/src/classpath-openjdk.cpp
+++ b/src/classpath-openjdk.cpp
@@ -562,6 +562,14 @@ class MyClasspath : public Classpath {
     expect(t, loadLibrary(t, libraryPath, "java", true, true));
 #endif // not AVIAN_OPENJDK_SRC
 
+    { object assertionLock = resolveField
+        (t, type(t, Machine::ClassLoaderType), "assertionLock",
+         "Ljava/lang/Object;");
+
+      set(t, root(t, Machine::BootLoader), fieldOffset(t, assertionLock),
+          root(t, Machine::BootLoader));
+    }
+
     { object class_ = resolveClass
         (t, root(t, Machine::BootLoader), "java/util/Properties", true,
          Machine::NoClassDefFoundErrorType);
@@ -594,14 +602,6 @@ class MyClasspath : public Classpath {
          root(t, Machine::BootLoader));
     }
 
-    { object assertionLock = resolveField
-        (t, type(t, Machine::ClassLoaderType), "assertionLock",
-         "Ljava/lang/Object;");
-
-      set(t, root(t, Machine::BootLoader), fieldOffset(t, assertionLock),
-          root(t, Machine::BootLoader));
-    }
-
     { object scl = resolveField
         (t, type(t, Machine::ClassLoaderType), "scl",
          "Ljava/lang/ClassLoader;");
diff --git a/src/compile.cpp b/src/compile.cpp
index 5e54cd8616..ce67081480 100644
--- a/src/compile.cpp
+++ b/src/compile.cpp
@@ -288,14 +288,6 @@ transition(MyThread* t, void* ip, void* stack, object continuation,
   MyThread::doTransition(t, ip, stack, continuation, trace);
 }
 
-unsigned
-parameterOffset(MyThread* t, object method)
-{
-  return methodParameterFootprint(t, method)
-    + t->arch->frameFooterSize()
-    + t->arch->frameReturnAddressSize() - 1;
-}
-
 object
 resolveThisPointer(MyThread* t, void* stack)
 {
@@ -9639,9 +9631,7 @@ boot(MyThread* t, BootImage* image, uint8_t* code)
   // fprintf(stderr, "code from %p to %p\n",
   //         code, code + image->codeSize);
  
-  static bool fixed = false;
-
-  if (not fixed) {
+  if (not image->initialized) {
     fixupHeap(t, heapMap, heapMapSizeInWords, heap);
   }
   
@@ -9688,7 +9678,7 @@ boot(MyThread* t, BootImage* image, uint8_t* code)
     
   findThunks(t, image, code);
 
-  if (fixed) {
+  if (image->initialized) {
     resetRuntimeState
       (t, classLoaderMap(t, root(t, Machine::BootLoader)), heap,
        image->heapSize);
@@ -9711,7 +9701,7 @@ boot(MyThread* t, BootImage* image, uint8_t* code)
       (t, classLoaderMap(t, root(t, Machine::AppLoader)), image, code);
   }
 
-  fixed = true;
+  image->initialized = true;
 
   setRoot(t, Machine::BootstrapClassMap, makeHashMap(t, 0, 0));
 }
@@ -10032,7 +10022,7 @@ compileVirtualThunk(MyThread* t, unsigned index, unsigned* size)
 
   sprintf(RUNTIME_ARRAY_BODY(virtualThunkName), "%s%d", virtualThunkBaseName, index);
 
-  logCompile(t, start, *size, 0, virtualThunkName, 0);
+  logCompile(t, start, *size, 0, RUNTIME_ARRAY_BODY(virtualThunkName), 0);
 
   return reinterpret_cast<uintptr_t>(start);
 }
diff --git a/src/compiler.cpp b/src/compiler.cpp
index 56a2709e42..213c6e81ae 100644
--- a/src/compiler.cpp
+++ b/src/compiler.cpp
@@ -579,27 +579,6 @@ cons(Context* c, void* value, Cell* next)
   return new (c->zone) Cell(next, value);
 }
 
-Cell*
-append(Context* c, Cell* first, Cell* second)
-{
-  if (first) {
-    if (second) {
-      Cell* start = cons(c, first->value, second);
-      Cell* end = start;
-      for (Cell* cell = first->next; cell; cell = cell->next) {
-        Cell* n = cons(c, cell->value, second);
-        end->next = n;
-        end = n;
-      }
-      return start;
-    } else {
-      return first;
-    }
-  } else {
-    return second;
-  }
-}
-
 Cell*
 reverseDestroy(Cell* cell)
 {
@@ -992,6 +971,8 @@ valid(Read* r)
   return r and r->valid();
 }
 
+#ifndef NDEBUG
+
 bool
 hasBuddy(Context* c, Value* a, Value* b)
 {
@@ -1011,6 +992,8 @@ hasBuddy(Context* c, Value* a, Value* b)
   return false;
 }
 
+#endif // not NDEBUG
+
 Read*
 live(Context* c UNUSED, Value* v)
 {
@@ -1618,7 +1601,7 @@ class ConstantSite: public Site {
   virtual unsigned toString(Context*, char* buffer, unsigned bufferSize) {
     if (value->resolved()) {
       return vm::snprintf
-        (buffer, bufferSize, "constant %"LLD, value->value());
+        (buffer, bufferSize, "constant %" LLD, value->value());
     } else {
       return vm::snprintf(buffer, bufferSize, "constant unresolved");
     }
@@ -1709,7 +1692,7 @@ class AddressSite: public Site {
   virtual unsigned toString(Context*, char* buffer, unsigned bufferSize) {
     if (address->resolved()) {
       return vm::snprintf
-        (buffer, bufferSize, "address %"LLD, address->value());
+        (buffer, bufferSize, "address %" LLD, address->value());
     } else {
       return vm::snprintf(buffer, bufferSize, "address unresolved");
     }
@@ -5302,16 +5285,17 @@ propagateJunctionSites(Context* c, Event* e)
 
 class SiteRecord {
  public:
-  SiteRecord(Site* site, Value* value):
-    site(site), value(value)
-  { }
-
-  SiteRecord() { }
-
   Site* site;
   Value* value;
 };
 
+void
+init(SiteRecord* r, Site* s, Value* v)
+{
+  r->site = s;
+  r->value = v;
+}
+
 class SiteRecordList {
  public:
   SiteRecordList(SiteRecord* records, unsigned capacity):
@@ -5329,7 +5313,7 @@ freeze(Context* c, SiteRecordList* frozen, Site* s, Value* v)
   assert(c, frozen->index < frozen->capacity);
 
   s->freeze(c, v);
-  new (frozen->records + (frozen->index ++)) SiteRecord(s, v);
+  init(new (frozen->records + (frozen->index ++)) SiteRecord, s, v);
 }
 
 void
@@ -5866,17 +5850,6 @@ compile(Context* c, uintptr_t stackOverflowHandler, unsigned stackLimitOffset)
   c->firstBlock = firstBlock;
 }
 
-unsigned
-count(Stack* s)
-{
-  unsigned c = 0;
-  while (s) {
-    ++ c;
-    s = s->next;
-  }
-  return c;
-}
-
 void
 restore(Context* c, ForkState* state)
 {
diff --git a/src/finder.cpp b/src/finder.cpp
index 1a08e65008..ba8aef75f4 100644
--- a/src/finder.cpp
+++ b/src/finder.cpp
@@ -12,6 +12,7 @@
 #include "system.h"
 #include "tokenizer.h"
 #include "finder.h"
+#include "lzma.h"
 
 using namespace vm;
 
@@ -173,11 +174,12 @@ class DirectoryElement: public Element {
 class PointerRegion: public System::Region {
  public:
   PointerRegion(System* s, Allocator* allocator, const uint8_t* start,
-                size_t length):
+                size_t length, bool freePointer = false):
     s(s),
     allocator(allocator),
     start_(start),
-    length_(length)
+    length_(length),
+    freePointer(freePointer)
   { }
 
   virtual const uint8_t* start() {
@@ -189,6 +191,9 @@ class PointerRegion: public System::Region {
   }
 
   virtual void dispose() {
+    if (freePointer) {
+      allocator->free(start_, length_);
+    }
     allocator->free(this, sizeof(*this));
   }
 
@@ -196,6 +201,7 @@ class PointerRegion: public System::Region {
   Allocator* allocator;
   const uint8_t* start_;
   size_t length_;
+  bool freePointer;
 };
 
 class DataRegion: public System::Region {
@@ -556,7 +562,10 @@ class BuiltinElement: public JarElement {
   virtual void init() {
     if (index == 0) {
       if (s->success(s->load(&library, libraryName))) {
-        void* p = library->resolve(name);
+        bool lzma = strncmp("lzma:", name, 5) == 0;
+        const char* symbolName = lzma ? name + 5 : name;
+
+        void* p = library->resolve(symbolName);
         if (p) {
           uint8_t* (*function)(unsigned*);
           memcpy(&function, &p, BytesPerWord);
@@ -564,10 +573,29 @@ class BuiltinElement: public JarElement {
           unsigned size;
           uint8_t* data = function(&size);
           if (data) {
+            bool freePointer;
+            if (lzma) {
+#ifdef AVIAN_USE_LZMA
+              unsigned outSize;
+              data = decodeLZMA(s, allocator, data, size, &outSize);
+              size = outSize;
+              freePointer = true;
+#else
+              abort(s);
+#endif
+            } else {
+              freePointer = false;
+            }
             region = new (allocator->allocate(sizeof(PointerRegion)))
-              PointerRegion(s, allocator, data, size);
+              PointerRegion(s, allocator, data, size, freePointer);
             index = JarIndex::open(s, allocator, region);
+          } else if (DebugFind) {
+            fprintf(stderr, "%s in %s returned null\n", symbolName,
+                    libraryName);
           }
+        } else if (DebugFind) {
+          fprintf(stderr, "unable to find %s in %s\n", symbolName,
+                  libraryName);
         }
       }
     }
diff --git a/src/heap.cpp b/src/heap.cpp
index b99de70de7..ed5d8777d4 100644
--- a/src/heap.cpp
+++ b/src/heap.cpp
@@ -60,7 +60,6 @@ void NO_RETURN abort(Context*);
 void assert(Context*, bool);
 #endif
 
-System* system(Context*);
 void* tryAllocate(Context* c, unsigned size);
 void* allocate(Context* c, unsigned size);
 void free(Context* c, const void* p, unsigned size);
@@ -689,12 +688,6 @@ class Context {
   int64_t totalTime;
 };
 
-inline System*
-system(Context* c)
-{
-  return c->system;
-}
-
 const char*
 segment(Context* c, void* p)
 {
diff --git a/src/heapwalk.cpp b/src/heapwalk.cpp
index a34baf96dc..811382a825 100644
--- a/src/heapwalk.cpp
+++ b/src/heapwalk.cpp
@@ -231,16 +231,6 @@ get(object o, unsigned offsetInWords)
     (mask(cast<void*>(o, offsetInWords * BytesPerWord)));
 }
 
-unsigned
-objectSize(Thread* t, object o)
-{
-  unsigned n = baseSize(t, o, objectClass(t, o));
-  if (objectExtended(t, o)) {
-    ++ n;
-  }
-  return n;
-}
-
 unsigned
 walk(Context* c, HeapVisitor* v, object p)
 {
diff --git a/src/jnienv.cpp b/src/jnienv.cpp
index ffc0937789..1631d0f3bb 100644
--- a/src/jnienv.cpp
+++ b/src/jnienv.cpp
@@ -252,7 +252,8 @@ NewString(Thread* t, const jchar* chars, jsize size)
 {
   if (chars == 0) return 0;
 
-  uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(chars), size };
+  uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(chars),
+                            static_cast<uintptr_t>(size) };
 
   return reinterpret_cast<jstring>(run(t, newString, arguments));
 }
@@ -311,7 +312,7 @@ DefineClass(Thread* t, const char*, jobject loader, const jbyte* buffer,
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(loader),
                             reinterpret_cast<uintptr_t>(buffer),
-                            length };
+                            static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jclass>(run(t, defineClass, arguments));
 }
@@ -1495,7 +1496,7 @@ SetByteField(Thread* t, jobject o, jfieldID field, jbyte v)
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(o),
                             field,
-                            v };
+                            static_cast<uintptr_t>(v) };
 
   run(t, setByteField, arguments);
 }
@@ -1545,7 +1546,7 @@ SetShortField(Thread* t, jobject o, jfieldID field, jshort v)
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(o),
                             field,
-                            v };
+                            static_cast<uintptr_t>(v) };
 
   run(t, setShortField, arguments);
 }
@@ -1570,7 +1571,7 @@ SetIntField(Thread* t, jobject o, jfieldID field, jint v)
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(o),
                             field,
-                            v };
+                            static_cast<uintptr_t>(v) };
 
   run(t, setIntField, arguments);
 }
@@ -1975,7 +1976,7 @@ SetStaticByteField(Thread* t, jobject c, jfieldID field, jbyte v)
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(c),
                             field,
-                            v };
+                            static_cast<uintptr_t>(v) };
 
   run(t, setStaticByteField, arguments);
 }
@@ -2033,7 +2034,7 @@ SetStaticShortField(Thread* t, jobject c, jfieldID field, jshort v)
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(c),
                             field,
-                            v };
+                            static_cast<uintptr_t>(v) };
 
   run(t, setStaticShortField, arguments);
 }
@@ -2062,7 +2063,7 @@ SetStaticIntField(Thread* t, jobject c, jfieldID field, jint v)
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(c),
                             field,
-                            v };
+                            static_cast<uintptr_t>(v) };
 
   run(t, setStaticIntField, arguments);
 }
@@ -2261,7 +2262,7 @@ newObjectArray(Thread* t, uintptr_t* arguments)
 jobjectArray JNICALL
 NewObjectArray(Thread* t, jsize length, jclass class_, jobject init)
 {
-  uintptr_t arguments[] = { length,
+  uintptr_t arguments[] = { static_cast<uintptr_t>(length),
                             reinterpret_cast<uintptr_t>(class_),
                             reinterpret_cast<uintptr_t>(init) };
 
@@ -2302,7 +2303,7 @@ NewBooleanArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeBooleanArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jbooleanArray>(run(t, newArray, arguments));
 }
@@ -2318,7 +2319,7 @@ NewByteArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeByteArray0)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jbyteArray>(run(t, newArray, arguments));
 }
@@ -2328,7 +2329,7 @@ NewCharArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeCharArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jcharArray>(run(t, newArray, arguments));
 }
@@ -2338,7 +2339,7 @@ NewShortArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeShortArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jshortArray>(run(t, newArray, arguments));
 }
@@ -2348,7 +2349,7 @@ NewIntArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeIntArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jintArray>(run(t, newArray, arguments));
 }
@@ -2358,7 +2359,7 @@ NewLongArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeLongArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jlongArray>(run(t, newArray, arguments));
 }
@@ -2368,7 +2369,7 @@ NewFloatArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeFloatArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jfloatArray>(run(t, newArray, arguments));
 }
@@ -2378,7 +2379,7 @@ NewDoubleArray(Thread* t, jsize length)
 {
   uintptr_t arguments[]
     = { reinterpret_cast<uintptr_t>(voidPointer(makeDoubleArray)),
-        length };
+        static_cast<uintptr_t>(length) };
 
   return reinterpret_cast<jdoubleArray>(run(t, newArray, arguments));
 }
@@ -2905,7 +2906,7 @@ RegisterNatives(Thread* t, jclass c, const JNINativeMethod* methods,
 {
   uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(c),
                             reinterpret_cast<uintptr_t>(methods),
-                            methodCount };
+                            static_cast<uintptr_t>(methodCount) };
 
   return run(t, registerNatives, arguments) ? 0 : -1;
 }
diff --git a/src/lzma-decode.cpp b/src/lzma-decode.cpp
new file mode 100644
index 0000000000..874e6f584d
--- /dev/null
+++ b/src/lzma-decode.cpp
@@ -0,0 +1,61 @@
+/* Copyright (c) 2012, 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 "lzma-util.h"
+#include "C/LzmaDec.h"
+
+using namespace vm;
+
+namespace {
+
+int32_t
+read4(const uint8_t* in)
+{
+  return (static_cast<int32_t>(in[3]) << 24)
+    |    (static_cast<int32_t>(in[2]) << 16)
+    |    (static_cast<int32_t>(in[1]) <<  8)
+    |    (static_cast<int32_t>(in[0])      );
+}
+
+} // namespace
+
+namespace vm {
+
+uint8_t*
+decodeLZMA(System* s, Allocator* a, uint8_t* in, unsigned inSize,
+           unsigned* outSize)
+{
+  const unsigned PropHeaderSize = 5;
+  const unsigned HeaderSize = 13;
+
+  int32_t outSize32 = read4(in + PropHeaderSize);
+  expect(s, outSize32 >= 0);
+  SizeT outSizeT = outSize32;
+
+  uint8_t* out = static_cast<uint8_t*>(a->allocate(outSize32));
+
+  SizeT inSizeT = inSize;
+  LzmaAllocator allocator(a);
+
+  ELzmaStatus status;
+  int result = LzmaDecode
+    (out, &outSizeT, in + HeaderSize, &inSizeT, in, PropHeaderSize,
+     LZMA_FINISH_END, &status, &(allocator.allocator));
+
+  expect(s, result == SZ_OK);
+  expect(s, status == LZMA_STATUS_FINISHED_WITH_MARK);
+
+  *outSize = outSize32;
+
+  return out;
+}
+
+} // namespace vm
+
diff --git a/src/lzma-encode.cpp b/src/lzma-encode.cpp
new file mode 100644
index 0000000000..cc7f8ad178
--- /dev/null
+++ b/src/lzma-encode.cpp
@@ -0,0 +1,71 @@
+/* Copyright (c) 2012, 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 "lzma-util.h"
+#include "C/LzmaEnc.h"
+
+using namespace vm;
+
+namespace {
+
+SRes
+myProgress(void*, UInt64, UInt64)
+{
+  return SZ_OK;
+}
+
+} // namespace
+
+namespace vm {
+
+uint8_t*
+encodeLZMA(System* s, Allocator* a, uint8_t* in, unsigned inSize,
+           unsigned* outSize)
+{
+  const unsigned PropHeaderSize = 5;
+  const unsigned HeaderSize = 13;
+
+  unsigned bufferSize = inSize * 2;
+
+  uint8_t* buffer = static_cast<uint8_t*>(a->allocate(bufferSize));
+
+  LzmaAllocator allocator(a);
+
+  CLzmaEncProps props;
+  LzmaEncProps_Init(&props);
+  props.level = 9;
+  props.writeEndMark = 1;
+
+  ICompressProgress progress = { myProgress };
+
+  SizeT propsSize = PropHeaderSize;
+
+  int32_t inSize32 = inSize;
+  memcpy(buffer + PropHeaderSize, &inSize32, 4);
+          
+  SizeT outSizeT = bufferSize;
+  int result = LzmaEncode
+    (buffer + HeaderSize, &outSizeT, in, inSize, &props, buffer,
+     &propsSize, 1, &progress, &(allocator.allocator), &(allocator.allocator));
+
+  expect(s, result == SZ_OK);
+
+  *outSize = outSizeT + HeaderSize;
+
+  uint8_t* out = static_cast<uint8_t*>(a->allocate(*outSize));
+  memcpy(out, buffer, *outSize);
+
+  a->free(buffer, bufferSize);
+
+  return out;
+}
+
+} // namespace vm
+
diff --git a/src/lzma-util.h b/src/lzma-util.h
new file mode 100644
index 0000000000..e7fc3093a0
--- /dev/null
+++ b/src/lzma-util.h
@@ -0,0 +1,53 @@
+/* Copyright (c) 2012, 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. */
+
+#ifndef LZMA_UTIL_H
+#define LZMA_UTIL_H
+
+#include "lzma.h"
+#include "C/Types.h"
+#include "system.h"
+#include "allocator.h"
+
+namespace vm {
+
+const unsigned Padding = 16;
+
+class LzmaAllocator {
+ public:
+  LzmaAllocator(Allocator* a): a(a) {
+    allocator.Alloc = allocate;
+    allocator.Free = free;
+  }
+
+  ISzAlloc allocator;
+  Allocator* a;
+
+  static void* allocate(void* allocator, size_t size) {
+    uint8_t* p = static_cast<uint8_t*>
+      (static_cast<LzmaAllocator*>(allocator)->a->allocate(size + Padding));
+    int32_t size32 = size;
+    memcpy(p, &size32, 4);
+    return p + Padding;
+  }
+
+  static void free(void* allocator, void* address) {
+    if (address) {
+      void* p = static_cast<uint8_t*>(address) - Padding;
+      int32_t size32;
+      memcpy(&size32, p, 4);
+      static_cast<LzmaAllocator*>(allocator)->a->free(p, size32 + Padding);
+    }
+  }
+};
+
+} // namespace vm
+
+#endif // LZMA_UTIL_H
diff --git a/src/lzma.h b/src/lzma.h
new file mode 100644
index 0000000000..5e6ba35a82
--- /dev/null
+++ b/src/lzma.h
@@ -0,0 +1,29 @@
+/* Copyright (c) 2012, 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. */
+
+#ifndef LZMA_H
+#define LZMA_H
+
+#include "system.h"
+#include "allocator.h"
+
+namespace vm {
+
+uint8_t*
+decodeLZMA(System* s, Allocator* a, uint8_t* in, unsigned inSize,
+           unsigned* outSize);
+
+uint8_t*
+encodeLZMA(System* s, Allocator* a, uint8_t* in, unsigned inSize,
+           unsigned* outSize);
+
+} // namespace vm
+
+#endif // LZMA_H
diff --git a/src/lzma/load.cpp b/src/lzma/load.cpp
new file mode 100644
index 0000000000..4a68466772
--- /dev/null
+++ b/src/lzma/load.cpp
@@ -0,0 +1,199 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "C/LzmaDec.h"
+
+#if (defined __MINGW32__) || (defined _MSC_VER)
+#  define EXPORT __declspec(dllexport)
+#  include <io.h>
+#  define open _open
+#  define write _write
+#  define close _close
+#  ifdef _MSC_VER
+#    define S_IRWXU (_S_IREAD | _S_IWRITE)
+#    define and &&
+#  endif
+#else
+#  define EXPORT __attribute__ ((visibility("default")))
+#  include <dlfcn.h>
+#  include <unistd.h>
+#  include <errno.h>
+#  define O_BINARY 0
+#endif
+
+#if (! defined __x86_64__) && ((defined __MINGW32__) || (defined _MSC_VER))
+#  define SYMBOL(x) binary_exe_##x
+#else
+#  define SYMBOL(x) _binary_exe_##x
+#endif
+
+extern "C" {
+
+  extern const uint8_t SYMBOL(start)[];
+  extern const uint8_t SYMBOL(end)[];
+
+} // extern "C"
+
+namespace {
+
+int32_t
+read4(const uint8_t* in)
+{
+  return (static_cast<int32_t>(in[3]) << 24)
+    |    (static_cast<int32_t>(in[2]) << 16)
+    |    (static_cast<int32_t>(in[1]) <<  8)
+    |    (static_cast<int32_t>(in[0])      );
+}
+
+void*
+myAllocate(void*, size_t size)
+{
+  return malloc(size);
+}
+
+void
+myFree(void*, void* address)
+{
+  free(address);
+}
+
+#if (defined __MINGW32__) || (defined _MSC_VER)
+
+void*
+openLibrary(const char* name)
+{
+  return LoadLibrary(name);
+}
+
+void*
+librarySymbol(void* library, const char* name)
+{
+  void* address;
+  FARPROC p = GetProcAddress(static_cast<HMODULE>(library), name);
+  memcpy(&address, &p, sizeof(void*));
+  return address;
+}
+
+const char*
+libraryError(void*)
+{
+  return "unknown error";
+}
+
+const char*
+temporaryFileName(char* buffer, unsigned size)
+{
+  unsigned c = GetTempPathA(size, buffer);
+  if (c) {
+    if (GetTempFileNameA(buffer, "223", 0, buffer + c)) {
+      DeleteFileA(buffer + c);
+      return buffer + c;
+    }
+  }
+  return 0;
+}
+
+#else
+
+void*
+openLibrary(const char* name)
+{
+  return dlopen(name, RTLD_LAZY | RTLD_LOCAL);
+}
+
+void*
+librarySymbol(void* library, const char* name)
+{
+  return dlsym(library, name);
+}
+
+const char*
+libraryError(void*)
+{
+  return dlerror();
+}
+
+const char*
+temporaryFileName(char* buffer, unsigned)
+{
+  return tmpnam(buffer);
+}
+
+#endif
+
+} // namespace
+
+int
+main(int ac, const char** av)
+{
+  const unsigned PropHeaderSize = 5;
+  const unsigned HeaderSize = 13;
+
+  SizeT inSize = SYMBOL(end) - SYMBOL(start);
+
+  int32_t outSize32 = read4(SYMBOL(start) + PropHeaderSize);
+  SizeT outSize = outSize32;
+
+  uint8_t* out = static_cast<uint8_t*>(malloc(outSize));
+  if (out) {
+    ISzAlloc allocator = { myAllocate, myFree };
+    ELzmaStatus status = LZMA_STATUS_NOT_SPECIFIED;
+
+    if (SZ_OK == LzmaDecode
+        (out, &outSize, SYMBOL(start) + HeaderSize, &inSize, SYMBOL(start),
+         PropHeaderSize, LZMA_FINISH_END, &status, &allocator))
+    {
+      const unsigned BufferSize = 1024;
+      char buffer[BufferSize];
+      const char* name = temporaryFileName(buffer, BufferSize);
+      if (name) {
+        int file = open(name, O_CREAT | O_EXCL | O_WRONLY | O_BINARY, S_IRWXU);
+        if (file != -1) {
+          SizeT result = write(file, out, outSize);
+          free(out);
+
+          if (close(file) == 0 and outSize == result) {
+            void* library = openLibrary(name);
+            unlink(name);
+
+            if (library) {
+              void* main = librarySymbol(library, "avianMain");
+              if (main) {
+                int (*mainFunction)(const char*, int, const char**);
+                memcpy(&mainFunction, &main, sizeof(void*));
+                return mainFunction(name, ac, av);
+              } else {
+                fprintf(stderr, "unable to find main in %s", name);
+              }
+            } else {
+              fprintf(stderr, "unable to load %s: %s\n", name,
+                      libraryError(library));
+            }
+          } else {
+            unlink(name);
+
+            fprintf(stderr, "close or write failed; tried %d, got %d; %s\n",
+                    static_cast<int>(outSize), static_cast<int>(result),
+                    strerror(errno));
+          }
+        } else {
+          fprintf(stderr, "unable to open %s\n", name);
+        }
+      } else {
+        fprintf(stderr, "unable to make temporary file name\n");
+      }
+    } else {
+      fprintf(stderr, "unable to decode LZMA data\n");
+    }
+  } else {
+    fprintf(stderr, "unable to allocate buffer of size %d\n",
+            static_cast<int>(outSize));
+  }
+
+  return -1;
+}
diff --git a/src/lzma/main.cpp b/src/lzma/main.cpp
new file mode 100644
index 0000000000..f6baa39bb9
--- /dev/null
+++ b/src/lzma/main.cpp
@@ -0,0 +1,190 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <sys/mman.h>
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+
+#include "LzmaEnc.h"
+#include "LzmaDec.h"
+
+namespace {
+
+int32_t
+read4(const uint8_t* in)
+{
+  return (static_cast<int32_t>(in[3]) << 24)
+    |    (static_cast<int32_t>(in[2]) << 16)
+    |    (static_cast<int32_t>(in[1]) <<  8)
+    |    (static_cast<int32_t>(in[0])      );
+}
+
+void*
+myAllocate(void*, size_t size)
+{
+  return malloc(size);
+}
+
+void
+myFree(void*, void* address)
+{
+  free(address);
+}
+
+SRes
+myProgress(void*, UInt64, UInt64)
+{
+  return SZ_OK;
+}
+
+void
+usageAndExit(const char* program)
+{
+  fprintf(stderr,
+          "usage: %s {encode|decode} <input file> <output file> "
+          "[<uncompressed size>]", program);
+  exit(-1);
+}
+
+} // namespace
+
+int
+main(int argc, const char** argv)
+{
+  if (argc < 4 or argc > 5) {
+    usageAndExit(argv[0]);
+  }
+
+  bool encode = strcmp(argv[1], "encode") == 0;
+
+  uint8_t* data = 0;
+  unsigned size;
+  int fd = open(argv[2], O_RDONLY);
+  if (fd != -1) {
+    struct stat s;
+    int r = fstat(fd, &s);
+    if (r != -1) {
+#ifdef WIN32
+      HANDLE fm;
+      HANDLE h = (HANDLE) _get_osfhandle (fd);
+
+      fm = CreateFileMapping(
+               h,
+               NULL,
+               PAGE_READONLY,
+               0,
+               0,
+               NULL);
+      data = static_cast<uint8_t*>(MapViewOfFile(
+                fm,
+                FILE_MAP_READ,
+                0,
+                0,
+                s.st_size));
+
+      CloseHandle(fm);
+#else
+      data = static_cast<uint8_t*>
+        (mmap(0, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0));
+#endif
+      size = s.st_size;
+    }
+    close(fd);
+  }
+
+  bool success = false;
+
+  if (data) {
+    const unsigned PropHeaderSize = 5;
+    const unsigned HeaderSize = 13;
+
+    SizeT outSize;
+    if (encode) {
+      outSize = size * 2;
+    } else {
+      int32_t outSize32 = read4(data + PropHeaderSize);
+      if (outSize32 >= 0) {
+        outSize = outSize32;
+      } else if (argc == 5) {
+        outSize = atoi(argv[4]);
+      } else {
+        outSize = -1;
+      }
+    }
+
+    if (outSize >= 0) {
+      uint8_t* out = static_cast<uint8_t*>(malloc(outSize));
+      if (out) {
+        SizeT inSize = size;
+        ISzAlloc allocator = { myAllocate, myFree };
+        ELzmaStatus status = LZMA_STATUS_NOT_SPECIFIED;
+        int result;
+        if (encode) {
+          CLzmaEncProps props;
+          LzmaEncProps_Init(&props);
+          props.level = 9;
+          props.writeEndMark = 1;
+
+          ICompressProgress progress = { myProgress };
+
+          SizeT propsSize = PropHeaderSize;
+
+          int32_t inSize32 = inSize;
+          memcpy(out + PropHeaderSize, &inSize32, 4);
+          
+          result = LzmaEncode
+            (out + HeaderSize, &outSize, data, inSize, &props, out,
+             &propsSize, 1, &progress, &allocator, &allocator);
+
+          outSize += HeaderSize;
+        } else {
+          result = LzmaDecode
+            (out, &outSize, data + HeaderSize, &inSize, data, PropHeaderSize,
+             LZMA_FINISH_END, &status, &allocator);
+        }
+
+        if (result == SZ_OK) {
+          FILE* outFile = fopen(argv[3], "wb");
+
+          if (outFile) {
+            if (fwrite(out, outSize, 1, outFile) == 1) {
+              success = true;
+            } else {
+              fprintf(stderr, "unable to write to %s\n", argv[3]);
+            }
+
+            fclose(outFile);
+          } else {
+            fprintf(stderr, "unable to open %s\n", argv[3]);
+          }
+        } else {
+          fprintf(stderr, "unable to %s data: result %d status %d\n",
+                  encode ? "encode" : "decode", result, status);
+        }
+
+        free(out);
+      } else {
+        fprintf(stderr, "unable to allocate output buffer\n");
+      }
+    } else {
+      fprintf(stderr, "unable to determine uncompressed size\n");
+    }
+
+#ifdef WIN32
+    UnmapViewOfFile(data);
+#else
+    munmap(data, size);
+#endif
+  } else {
+    perror(argv[0]);
+  }
+
+  return (success ? 0 : -1);
+}
diff --git a/src/machine.cpp b/src/machine.cpp
index 4c99de36de..67f70196fe 100644
--- a/src/machine.cpp
+++ b/src/machine.cpp
@@ -15,6 +15,7 @@
 #include "constants.h"
 #include "processor.h"
 #include "arch.h"
+#include "lzma.h"
 
 using namespace vm;
 
@@ -35,14 +36,6 @@ atomicIncrement(uint32_t* p, int v)
 }
 #endif
 
-bool
-find(Thread* t, Thread* o)
-{
-  return (t == o)
-    or (t->peer and find(t->peer, o))
-    or (t->child and find(t->child, o));
-}
-
 void
 join(Thread* t, Thread* o)
 {
@@ -56,6 +49,16 @@ join(Thread* t, Thread* o)
   }
 }
 
+#ifndef NDEBUG
+
+bool
+find(Thread* t, Thread* o)
+{
+  return (t == o)
+    or (t->peer and find(t->peer, o))
+    or (t->child and find(t->child, o));
+}
+
 unsigned
 count(Thread* t, Thread* o)
 {
@@ -78,6 +81,8 @@ fill(Thread* t, Thread* o, Thread** array)
   return array;
 }
 
+#endif // not NDEBUG
+
 void
 dispose(Thread* t, Thread* o, bool remove)
 {
@@ -233,8 +238,8 @@ turnOffTheLights(Thread* t)
   Finder* af = m->appFinder;
 
   c->dispose();
-  m->dispose();
   h->disposeFixies();
+  m->dispose();
   p->dispose();
   bf->dispose();
   af->dispose();
@@ -2920,6 +2925,7 @@ Machine::Machine(System* system, Heap* heap, Finder* bootFinder,
   shutdownLock(0),
   libraries(0),
   errorLog(0),
+  bootimage(0),
   types(0),
   roots(0),
   finalizers(0),
@@ -2975,6 +2981,10 @@ Machine::dispose()
     heap->free(heapPool[i], ThreadHeapSizeInBytes);
   }
 
+  if (bootimage) {
+    heap->free(bootimage, bootimageSize);
+  }
+
   heap->free(arguments, sizeof(const char*) * argumentCount);
 
   heap->free(properties, sizeof(const char*) * propertyCount);
@@ -3030,13 +3040,28 @@ Thread::init()
     uint8_t* code = 0;
     const char* imageFunctionName = findProperty(m, "avian.bootimage");
     if (imageFunctionName) {
-      void* imagep = m->libraries->resolve(imageFunctionName);
+      bool lzma = strncmp("lzma:", imageFunctionName, 5) == 0;
+      const char* symbolName
+        = lzma ? imageFunctionName + 5 : imageFunctionName;
+
+      void* imagep = m->libraries->resolve(symbolName);
       if (imagep) {
-        BootImage* (*imageFunction)(unsigned*);
+        uint8_t* (*imageFunction)(unsigned*);
         memcpy(&imageFunction, &imagep, BytesPerWord);
 
         unsigned size;
-        image = imageFunction(&size);
+        uint8_t* imageBytes = imageFunction(&size);
+        if (lzma) {
+#ifdef AVIAN_USE_LZMA
+          m->bootimage = image = reinterpret_cast<BootImage*>
+            (decodeLZMA
+             (m->system, m->heap, imageBytes, size, &(m->bootimageSize)));
+#else
+          abort(this);
+#endif
+        } else {
+          image = reinterpret_cast<BootImage*>(imageBytes);
+        }
 
         const char* codeFunctionName = findProperty(m, "avian.codeimage");
         if (codeFunctionName) {
diff --git a/src/machine.h b/src/machine.h
index 05bc01b1e6..9671d6cf7c 100644
--- a/src/machine.h
+++ b/src/machine.h
@@ -1316,6 +1316,7 @@ class Machine {
   System::Monitor* shutdownLock;
   System::Library* libraries;
   FILE* errorLog;
+  BootImage* bootimage;
   object types;
   object roots;
   object finalizers;
@@ -1332,6 +1333,7 @@ class Machine {
   JNIEnvVTable jniEnvVTable;
   uintptr_t* heapPool[ThreadHeapPoolSize];
   unsigned heapPoolIndex;
+  unsigned bootimageSize;
 };
 
 void
@@ -2231,6 +2233,39 @@ makeByteArray(Thread* t, const char* format, ...);
 object
 makeString(Thread* t, const char* format, ...);
 
+#ifndef HAVE_StringOffset
+
+inline unsigned
+stringLength(Thread* t, object string)
+{
+  return arrayLength(t, stringData(t, string));
+}
+
+inline unsigned
+stringOffset(Thread*, object)
+{
+  return 0;
+}
+
+inline object
+makeString(Thread* t, object data, unsigned offset, unsigned length, unsigned)
+{
+  if (offset == 0 and length == arrayLength(t, data)) {
+    return makeString(t, data, 0, 0);
+  } else {
+    PROTECT(t, data);
+
+    object array = makeCharArray(t, length);
+
+    memcpy(&charArrayBody(t, array, 0), &charArrayBody(t, data, offset),
+           length * 2);
+
+    return makeString(t, array, 0, 0);
+  }
+}
+
+#endif // not HAVE_StringOffset
+
 int
 stringUTFLength(Thread* t, object string, unsigned start, unsigned length);
 
diff --git a/src/posix.cpp b/src/posix.cpp
index 3d0f525013..ea3f133d37 100644
--- a/src/posix.cpp
+++ b/src/posix.cpp
@@ -340,7 +340,8 @@ class MySystem: public System {
             // milliseconds) is infinity so as to avoid overflow:
             if (time and time < INT64_C(31536000000000000)) {
               int64_t then = s->now() + time;
-              timespec ts = { then / 1000, (then % 1000) * 1000 * 1000 };
+              timespec ts = { static_cast<long>(then / 1000),
+                              static_cast<long>((then % 1000) * 1000 * 1000) };
               int rv UNUSED = pthread_cond_timedwait
                 (&(t->condition), &(t->mutex), &ts);
               expect(s, rv == 0 or rv == ETIMEDOUT or rv == EINTR);
diff --git a/src/type-generator.cpp b/src/type-generator.cpp
index ca5bd37056..f31b0f18c8 100644
--- a/src/type-generator.cpp
+++ b/src/type-generator.cpp
@@ -70,12 +70,6 @@ equal(const char* a, const char* b)
   return strcmp(a, b) == 0;
 }
 
-inline bool
-startsWith(const char* a, const char* b)
-{
-  return strncmp(a, b, strlen(a)) == 0;
-}
-
 inline bool
 endsWith(const char* a, const char* b)
 {
@@ -284,14 +278,6 @@ setCdr(Object* o, Object* v)
   static_cast<Pair*>(o)->cdr = v;
 }
 
-unsigned
-length(Object* o)
-{
-  unsigned c = 0;
-  for (; o; o = cdr(o)) ++c;
-  return c;
-}
-
 class List {
  public:
   Object* first;
@@ -1078,53 +1064,6 @@ parseSubdeclaration(Object* t, Object* p, Object* declarations)
   }
 }
 
-bool
-memberEqual(Object* a, Object* b)
-{
-  if (a->type == b->type) {
-    switch (a->type) {
-    case Object::Scalar:
-      return equal(memberTypeName(a), memberTypeName(b))
-        and memberNoAssert(a) == memberNoAssert(b)
-        and memberNoGC(a) == memberNoGC(b);
-
-      // todo: compare array fields
-
-    default: return false;
-    }
-  } else {
-    return false;
-  }
-}
-
-bool
-specEqual(Object* a, Object* b)
-{
-  if (a->type == Object::Type and
-      b->type == Object::Type)
-  {
-    MemberIterator ai(a);
-    MemberIterator bi(b);
-    while (ai.hasMore()) {
-      if (not bi.hasMore()) {
-        return false;
-      }
-
-      if (not memberEqual(ai.next(), bi.next())) {
-        return false;
-      }
-    }
-
-    if (bi.hasMore()) {
-      return false;
-    } else {
-      return true;
-    }
-  } else {
-    return false;
-  }
-}
-
 const char*
 append(const char* a, const char* b, const char* c, const char* d)
 {
@@ -1445,6 +1384,11 @@ writeAccessor(Output* out, Object* member, Object* offset, bool unsafe = false)
     out->write(" = ");
     writeOffset(out, offset);
     out->write(";\n\n");
+
+    out->write("#define HAVE_");
+    out->write(capitalize(local::typeName(memberOwner(member))));
+    out->write(capitalize(memberName(member)));
+    out->write(" 1\n\n");
   }
 
   out->write("inline ");
@@ -1725,13 +1669,6 @@ writeConstructorInitializations(Output* out, Object* t)
   }
 }
 
-unsigned
-typeMemberCount(Object* o)
-{
-  if (o == 0) return 0;
-  return length(typeMembers(o)) + typeMemberCount(typeSuper(o));
-}
-
 void
 writeInitializerDeclarations(Output* out, Object* declarations)
 {
@@ -1888,17 +1825,6 @@ writeEnums(Output* out, Object* declarations)
   } 
 }
 
-unsigned
-memberCount(Object* o)
-{
-  unsigned c = 0;
-  for (MemberIterator it(o); it.hasMore();) {
-    it.next();
-    ++c;
-  }
-  return c;
-}
-
 unsigned
 methodCount(Object* o)
 {
diff --git a/src/x86.cpp b/src/x86.cpp
index 095a567c63..6875449953 100644
--- a/src/x86.cpp
+++ b/src/x86.cpp
@@ -198,44 +198,12 @@ assert(ArchitectureContext* c, bool v)
 }
 #endif // not NDEBUG
 
-void
-expect(Context* c, bool v)
-{
-  expect(c->s, v);
-}
-
 ResolvedPromise*
 resolved(Context* c, int64_t value)
 {
   return new(c->zone) ResolvedPromise(value);
 }
 
-class CodePromise: public Promise {
- public:
-  CodePromise(Context* c, unsigned offset): c(c), offset(offset) { }
-
-  virtual int64_t value() {
-    if (resolved()) {
-      return reinterpret_cast<intptr_t>(c->result + offset);
-    }
-    
-    abort(c);
-  }
-
-  virtual bool resolved() {
-    return c->result != 0;
-  }
-
-  Context* c;
-  unsigned offset;
-};
-
-CodePromise*
-codePromise(Context* c, unsigned offset)
-{
-  return new (c->zone) CodePromise(c, offset);
-}
-
 class Offset: public Promise {
  public:
   Offset(Context* c, MyBlock* block, unsigned offset, AlignmentPadding* limit):
@@ -629,14 +597,6 @@ opcode(Context* c, uint8_t op1, uint8_t op2)
   c->code.append(op2);
 }
 
-void
-opcode(Context* c, uint8_t op1, uint8_t op2, uint8_t op3)
-{
-  c->code.append(op1);
-  c->code.append(op2);
-  c->code.append(op3);
-}
-
 void
 return_(Context* c)
 {