diff --git a/Makefile b/Makefile
index e0e2f48..0c1c651 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,7 @@ main: $(MAIN_OBJ)
 	$(CC) $(ARCH) $^ -o $@
 
 clean:
-	rm -f main print_class c/*.o
+	rm -f main print_class c/*.o c/*.d
 
 .SUFFIXES:
 .INTERMEDIATE:
diff --git a/c/assert.h b/c/assert.h
new file mode 100644
index 0000000..d708512
--- /dev/null
+++ b/c/assert.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#if defined(__linux__)
+#include "assert_hosted.h"
+#elif defined(_WIN32)
+#include "assert_hosted.h"
+#elif defined(__APPLE__)
+#include "assert_hosted.h"
+#else
+#include "assert_dreamcast.h"
+#endif
diff --git a/c/assert_dreamcast.h b/c/assert_dreamcast.h
new file mode 100644
index 0000000..cdf3044
--- /dev/null
+++ b/c/assert_dreamcast.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define assert(b)
diff --git a/c/assert_hosted.h b/c/assert_hosted.h
new file mode 100644
index 0000000..7cf48a1
--- /dev/null
+++ b/c/assert_hosted.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#include <assert.h>
diff --git a/c/class_file.c b/c/class_file.c
index 540e9c8..a0fd380 100644
--- a/c/class_file.c
+++ b/c/class_file.c
@@ -1,7 +1,4 @@
-#ifdef DEBUG
-#include <assert.h>
-#endif
-
+#include "assert.h"
 #include "class_file.h"
 #include "malloc.h"
 #include "bytes.h"
diff --git a/c/class_resolver.c b/c/class_resolver.c
index 5cecf81..1e195db 100644
--- a/c/class_resolver.c
+++ b/c/class_resolver.c
@@ -1,16 +1,14 @@
 #include <stdint.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <assert.h>
 
+#include "assert.h"
 #include "class_file.h"
-#include "file.h"
 #include "hash_table.h"
 #include "malloc.h"
 #include "class_resolver.h"
 #include "string.h"
 #include "debug_class_file.h"
 #include "memory_allocator.h"
+#include "printf.h"
 
 static void class_resolver_create_interfaces_hash_table(struct class_entry * class_entry)
 {
@@ -53,7 +51,7 @@ static int field_size(struct class_file * class_file, struct field_info * field_
 static int32_t class_resolver_create_fields_hash_table(struct class_entry * class_entry)
 {
   struct class_file * class_file = class_entry->class_file;
-  int fields_hash_table_length = class_file->fields_count * 2;
+  int fields_hash_table_length = hash_table_next_power_of_two(class_file->fields_count * 2);
   uint32_t fields_hash_table_size = (sizeof (struct hash_table_entry)) * fields_hash_table_length;
   struct hash_table_entry * fields_hash_table = malloc_class_arena(fields_hash_table_size);
   uint32_t field_entry_size = (sizeof (struct field_entry)) * class_file->fields_count;
@@ -97,7 +95,7 @@ static int32_t class_resolver_create_fields_hash_table(struct class_entry * clas
 static void class_resolver_create_methods_hash_table(struct class_entry * class_entry)
 {
   struct class_file * class_file = class_entry->class_file;
-  int methods_hash_table_length = class_file->methods_count * 2;
+  int methods_hash_table_length = hash_table_next_power_of_two(class_file->methods_count * 2);
   uint32_t methods_hash_table_size = (sizeof (struct hash_table_entry)) * methods_hash_table_length;
   struct hash_table_entry * methods_hash_table = malloc_class_arena(methods_hash_table_size);
   for (int i = 0; i < class_file->methods_count; i++) {
@@ -149,30 +147,20 @@ static void class_resolver_allocate_attribute_entry(struct class_entry * class_e
   class_entry->attribute_entry = attribute_entry;
 }
 
-struct hash_table_entry * class_resolver_load_from_filenames(const char * filenames[], int length, int * hash_table_length)
+struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t * class_names[],
+                                                           const int class_names_length[],
+                                                           uint8_t * buffers[],
+                                                           int length,
+                                                           int * hash_table_length)
 {
-  int class_hash_table_length = length * 2;
+  int class_hash_table_length = hash_table_next_power_of_two(hash_table_next_power_of_two(length * 2));
   uint32_t class_hash_table_size = (sizeof (struct hash_table_entry)) * class_hash_table_length;
   struct hash_table_entry * class_hash_table = malloc_class_arena(class_hash_table_size);
   uint32_t class_entry_size = (sizeof (struct class_entry)) * length;
   struct class_entry * class_entry = malloc_class_arena(class_entry_size);
 
   for (int i = 0; i < length; i++) {
-    uint32_t filename_length = string_length(filenames[i]);
-    const char * suffix = ".class";
-    uint32_t suffix_length = string_length(suffix);
-    const char * filename_suffix = &filenames[i][filename_length - suffix_length];
-    if (filename_length <= suffix_length || !string_equal(suffix, filename_suffix)) {
-      printf("invalid class filename: %s\n", filenames[i]);
-      continue;
-    }
-    uint32_t class_name_length = filename_length - suffix_length;
-
-    printf("load class: %s\n", filenames[i]);
-
-    uint8_t * buf = file_read(filenames[i]);
-    struct class_file * class_file = class_file_parse(buf);
-    free(buf);
+    struct class_file * class_file = class_file_parse(buffers[i]);
 
     assert(class_file->magic == 0xcafebabe);
 
@@ -181,8 +169,8 @@ struct hash_table_entry * class_resolver_load_from_filenames(const char * filena
 
     hash_table_add(class_hash_table_length,
                    class_hash_table,
-                   (const uint8_t *)filenames[i],
-                   class_name_length,
+                   class_names[i],
+                   class_names_length[i],
                    &class_entry[i]);
 
     // make hash table for interfaces
diff --git a/c/class_resolver.h b/c/class_resolver.h
index fa17ea1..26238ba 100644
--- a/c/class_resolver.h
+++ b/c/class_resolver.h
@@ -48,7 +48,11 @@ struct class_entry {
   } methods;
 };
 
-struct hash_table_entry * class_resolver_load_from_filenames(const char * filenames[], int length, int * hash_table_length);
+struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t * class_names[],
+                                                           const int class_names_length[],
+                                                           uint8_t * buffers[],
+                                                           int length,
+                                                           int * hash_table_length);
 struct class_entry * class_resolver_lookup_class(int class_hash_table_length,
                                                  struct hash_table_entry * class_hash_table,
                                                  const uint8_t * class_name,
diff --git a/c/debug_class_file.c b/c/debug_class_file.c
index 4f10a56..5856bf9 100644
--- a/c/debug_class_file.c
+++ b/c/debug_class_file.c
@@ -1,13 +1,13 @@
-#include <stdio.h>
-#include <assert.h>
 #include <stdint.h>
-#include <string.h>
 #include <inttypes.h>
 
+#include "assert.h"
 #include "class_file.h"
 #include "bytes.h"
 #include "decode.h"
 #include "debug_class_file.h"
+#include "printf.h"
+#include "string.h"
 
 void print_utf8_string(struct constant * constant)
 {
@@ -163,9 +163,9 @@ void print_attribute(const char * indent, struct attribute_info * attribute, str
     fputs(indent, stdout);
     printf("attributes:\n");
     for (int i = 0; i < attribute->code->attributes_count; i++) {
-      char indent2[strlen(indent) + 2 + 1];
-      strcpy(indent2, indent);
-      strcpy(indent2 + strlen(indent), "    ");
+      char indent2[string_length(indent) + 2 + 1];
+      string_copy(indent2, indent);
+      string_copy(indent2 + string_length(indent), "    ");
       fputs(indent, stdout);
       printf("  attribute %d:\n", i);
       print_attribute(indent2, &attribute->code->attributes[i], constant_pool);
diff --git a/c/decode.c b/c/decode.c
index 0557117..cccaed1 100644
--- a/c/decode.c
+++ b/c/decode.c
@@ -1,10 +1,10 @@
 #include <stdint.h>
-#include <assert.h>
-#include <stdio.h>
 
+#include "assert.h"
 #include "decode.h"
 #include "execute.h"
 #include "bswap.h"
+#include "printf.h"
 
 static inline uint32_t _u4(const uint8_t * buf)
 {
diff --git a/c/execute.c b/c/execute.c
index 01d297e..fc47c8d 100644
--- a/c/execute.c
+++ b/c/execute.c
@@ -1,10 +1,9 @@
-#include <stdio.h>
-
 #include "execute.h"
 #include "memory_allocator.h"
 #include "bswap.h"
 #include "class_resolver.h"
 #include "execute_helper.h"
+#include "printf.h"
 
 void op_aaload(struct vm * vm)
 {
diff --git a/c/file.c b/c/file.c
index 07b9ed4..675d819 100644
--- a/c/file.c
+++ b/c/file.c
@@ -5,7 +5,7 @@
 
 #include "file.h"
 
-uint8_t * file_read(const char * path)
+uint8_t * file_read(const char * path, size_t * file_size)
 {
   int ret;
   FILE * f = fopen(path, "rb");
@@ -21,5 +21,7 @@ uint8_t * file_read(const char * path)
   size_t read = fread(buf, 1, size, f);
   assert(read == size);
 
+  *file_size = size;
+
   return buf;
 }
diff --git a/c/file.h b/c/file.h
index 69b502c..9ada825 100644
--- a/c/file.h
+++ b/c/file.h
@@ -2,4 +2,4 @@
 
 #include <stdint.h>
 
-uint8_t * file_read(const char * path);
+uint8_t * file_read(const char * path, size_t * file_size);
diff --git a/c/frame.c b/c/frame.c
index b95e584..7d73609 100644
--- a/c/frame.c
+++ b/c/frame.c
@@ -1,7 +1,6 @@
 #include <stdint.h>
-#include <assert.h>
-#include <stdio.h>
 
+#include "assert.h"
 #include "class_file.h"
 #include "memory.h"
 #include "debug_class_file.h"
@@ -9,6 +8,7 @@
 #include "decode.h"
 #include "frame.h"
 #include "class_resolver.h"
+#include "printf.h"
 
 struct Code_attribute * get_code_attribute(int code_name_index,
                                            int attributes_count,
diff --git a/c/frame.h b/c/frame.h
index e885e29..4c6dd52 100644
--- a/c/frame.h
+++ b/c/frame.h
@@ -1,7 +1,6 @@
 #pragma once
 
-#include <assert.h>
-
+#include "assert.h"
 #include "class_file.h"
 #include "class_resolver.h"
 
diff --git a/c/hash_table.c b/c/hash_table.c
index 79ee5cb..f4c48ed 100644
--- a/c/hash_table.c
+++ b/c/hash_table.c
@@ -1,10 +1,22 @@
-#include <assert.h>
-
+#include "assert.h"
 #include "malloc.h"
 #include "hash_table.h"
+#include "printf.h"
 
 static const uint32_t fnv_offset_basis = 0x811c9dc5;
 
+int32_t hash_table_next_power_of_two(int32_t n)
+{
+  n--;
+  n |= n >> 1;
+  n |= n >> 2;
+  n |= n >> 4;
+  n |= n >> 8;
+  n |= n >> 16;
+  n++;
+  return n;
+}
+
 static uint32_t fnv_1(uint32_t hash, const uint8_t * buf, int length)
 {
   const uint32_t fnv_prime = 0x01000193;
@@ -26,9 +38,6 @@ void hash_table_init(int hash_table_length,
   }
 }
 
-
-#include <stdio.h>
-
 void print_key(const uint8_t * key, int key_length)
 {
   printf("key: ");
@@ -44,6 +53,7 @@ void hash_table_add(int hash_table_length,
                     void * value)
 {
   assert(hash_table_length != 0);
+  assert((hash_table_length & (hash_table_length - 1)) == 0);
   uint32_t hash = fnv_1(fnv_offset_basis, key, key_length) & (hash_table_length - 1);
   struct hash_table_entry * e = &entry[hash];
 
@@ -82,17 +92,19 @@ struct hash_table_entry * hash_table_find(int hash_table_length,
                                           int key_length)
 {
   assert(hash_table_length != 0);
+  assert((hash_table_length & (hash_table_length - 1)) == 0);
   uint32_t hash = fnv_1(fnv_offset_basis, key, key_length) & (hash_table_length - 1);
   struct hash_table_entry * e = &entry[hash];
 
   while (e != nullptr && e->key != nullptr) {
-    printf("key find: %p ", e->key);
-    print_key(e->key, e->key_length);
+    //printf("key find: %p ", e->key);
+    //print_key(e->key, e->key_length);
     if (e->key_length == key_length && key_equal(key, e->key, e->key_length)) {
       return e;
     }
     e = e->next;
   }
+  fflush(stdout);
   return nullptr;
 }
 
@@ -120,6 +132,7 @@ void hash_table_add2(int hash_table_length,
                      void * value)
 {
   assert(hash_table_length != 0);
+  assert((hash_table_length & (hash_table_length - 1)) == 0);
   uint32_t hash = fnv_offset_basis;
   hash = fnv_1(hash, key1, key1_length);
   hash = fnv_1(hash, key2, key2_length);
@@ -152,6 +165,7 @@ struct hash_table_entry * hash_table_find2(int hash_table_length,
                                            int key2_length)
 {
   assert(hash_table_length != 0);
+  assert((hash_table_length & (hash_table_length - 1)) == 0);
   uint32_t hash = fnv_offset_basis;
   hash = fnv_1(hash, key1, key1_length);
   hash = fnv_1(hash, key2, key2_length);
diff --git a/c/hash_table.h b/c/hash_table.h
index 3fe36a5..fc88ebc 100644
--- a/c/hash_table.h
+++ b/c/hash_table.h
@@ -9,6 +9,8 @@ struct hash_table_entry {
   struct hash_table_entry * next;
 };
 
+int32_t hash_table_next_power_of_two(int32_t n);
+
 void hash_table_init(int hash_table_length,
                      struct hash_table_entry * entry);
 
diff --git a/c/main.c b/c/main.c
index fdcd410..9a7efef 100644
--- a/c/main.c
+++ b/c/main.c
@@ -1,6 +1,47 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
 #include "frame.h"
 #include "class_resolver.h"
 #include "string.h"
+#include "file.h"
+
+static struct hash_table_entry * load_from_filenames(const char * filenames[], int length, int * hash_table_length)
+{
+  const uint8_t ** class_names = (const uint8_t **)filenames;
+  int class_names_length[length];
+  uint8_t * buffers[length];
+  size_t file_size[length];
+
+  for (int i = 0; i < length; i++) {
+    uint32_t filename_length = string_length(filenames[i]);
+    const char * suffix = ".class";
+    uint32_t suffix_length = string_length(suffix);
+    const char * filename_suffix = &filenames[i][filename_length - suffix_length];
+    if (filename_length <= suffix_length || !string_equal(suffix, filename_suffix)) {
+      printf("invalid class filename: %s\n", filenames[i]);
+      continue;
+    }
+    class_names_length[i] = filename_length - suffix_length;
+    printf("load class: %s\n", filenames[i]);
+
+    buffers[i] = file_read(filenames[i], &file_size[i]);
+  }
+
+  struct hash_table_entry * class_hash_table = class_resolver_load_from_buffers(class_names,
+                                                                                class_names_length,
+                                                                                buffers,
+                                                                                length,
+                                                                                hash_table_length);
+
+  for (int i = 0; i < length; i++) {
+    memset(buffers[i], 0, file_size[i]);
+    free(buffers[i]);
+  }
+
+  return class_hash_table;
+}
 
 int main(int argc, const char * argv[])
 {
@@ -12,7 +53,7 @@ int main(int argc, const char * argv[])
   int num_class_filenames = argc - 2;
 
   int class_hash_table_length;
-  struct hash_table_entry * class_hash_table = class_resolver_load_from_filenames(class_filenames, num_class_filenames, &class_hash_table_length);
+  struct hash_table_entry * class_hash_table = load_from_filenames(class_filenames, num_class_filenames, &class_hash_table_length);
 
   struct class_entry * class_entry = class_resolver_lookup_class(class_hash_table_length,
                                                                  class_hash_table,
diff --git a/c/malloc.c b/c/malloc.c
index 3386130..de894b0 100644
--- a/c/malloc.c
+++ b/c/malloc.c
@@ -1,7 +1,6 @@
+#include "assert.h"
 #include "malloc.h"
 
-#include <assert.h>
-
 struct arena {
   uint8_t * mem;
   uint32_t size;
diff --git a/c/memory_allocator.c b/c/memory_allocator.c
index 0535fea..f9705cf 100644
--- a/c/memory_allocator.c
+++ b/c/memory_allocator.c
@@ -1,6 +1,8 @@
-#include <assert.h>
 #include <stdint.h>
 
+#include "assert.h"
+#include "printf.h"
+
 #define block_power (5UL)
 #define block_size (1UL << block_power)
 //static uint8_t memory[0x100];
@@ -31,8 +33,6 @@ static inline uint32_t find_contiguous_blocks(uint32_t blocks, int * zero_crossi
   return blocks;
 }
 
-#include <stdio.h>
-
 void * memory_allocate(uint32_t size)
 {
   assert(size != 0);
diff --git a/c/print_class.c b/c/print_class.c
index edb6fd6..6afb9a7 100644
--- a/c/print_class.c
+++ b/c/print_class.c
@@ -1,8 +1,7 @@
-#include <stdio.h>
-#include <assert.h>
-
+#include "assert.h"
 #include "debug_class_file.h"
 #include "file.h"
+#include "printf.h"
 
 int main(int argc, char * argv[])
 {
diff --git a/c/printf.h b/c/printf.h
new file mode 100644
index 0000000..6a53840
--- /dev/null
+++ b/c/printf.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#if defined(__linux__)
+#include "printf_hosted.h"
+#elif defined(_WIN32)
+#include "printf_hosted.h"
+#elif defined(__APPLE__)
+#include "printf_hosted.h"
+#else
+#include "printf_dreamcast.h"
+#endif
diff --git a/c/printf_dreamcast.c b/c/printf_dreamcast.c
new file mode 100644
index 0000000..e69de29
diff --git a/c/printf_hosted.h b/c/printf_hosted.h
new file mode 100644
index 0000000..1e6b64e
--- /dev/null
+++ b/c/printf_hosted.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdio.h>
+
+#define debugf(fmt, ...) printf((fmt), __VA_ARGS__);
+#define debugc(c) putc(stdout, c);
diff --git a/c/string.h b/c/string.h
index 2da8d26..5fab4c5 100644
--- a/c/string.h
+++ b/c/string.h
@@ -9,6 +9,14 @@ static inline int string_length(const char * s)
   return si - s;
 }
 
+static inline void string_copy(char * dst, const char * src)
+{
+  while (*src != 0) {
+    *dst++ = *src++;
+  }
+  *dst = 0;
+}
+
 static inline bool string_equal(const char * a, const char * b)
 {
   int i = 0;
diff --git a/c/test_hash_table.c b/c/test_hash_table.c
index df7a42f..441e779 100644
--- a/c/test_hash_table.c
+++ b/c/test_hash_table.c
@@ -145,11 +145,7 @@ static uint32_t _strlen(const char * s)
   return si - s;
 }
 
-void print_key(const uint8_t * key, int key_length)
-{
-  for (int i = 0; i < key_length; i++)
-    fputc(key[i], stdout);
-}
+void print_key(const uint8_t * key, int key_length);
 
 int main()
 {
diff --git a/p/Fields.java b/p/Fields.java
new file mode 100644
index 0000000..bef791f
--- /dev/null
+++ b/p/Fields.java
@@ -0,0 +1,11 @@
+package p;
+
+class Fields {
+    int foo;
+    long bar;
+    int[] spam;
+    static float baz;
+    static float bleh;
+    static double qux;
+    static Object eggs;
+}
diff --git a/p/Generic.java b/p/Generic.java
new file mode 100644
index 0000000..c33b9ee
--- /dev/null
+++ b/p/Generic.java
@@ -0,0 +1,22 @@
+package p;
+
+class Generic<T, U>
+{
+    T obj1;  // An object of type T
+    U obj2;  // An object of type U
+
+    // constructor
+    Generic(T obj1, U obj2)
+    {
+        this.obj1 = obj1;
+        this.obj2 = obj2;
+    }
+
+    // To print objects of T and U
+    public static void print()
+    {
+        float ff = 1.0f;
+        Float f = new Float(f);
+        Generic<Integer, Float> g = new Generic<Integer, Float>(1, f);
+    }
+}