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jocaml
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xenia 2021-07-31 17:29:12 -04:00
commit 6600d02c48
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4
.gitignore vendored Normal file
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*.byte
*.class
*.cmi
*.cmo

299
Jocaml.java Normal file
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import java.io.File;
import java.io.FileInputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Jocaml {
private static String TRAILER_MAGIC = "Caml1999X028";
private static long MARSHAL_MAGIC_SMALL = 0x8495A6BE;
private static long MARSHAL_MAGIC_BIG = 0x8495A6BF;
private static class CodeOffset {
public final int offset;
public CodeOffset(int offset) {
this.offset = offset;
}
public String toString() {
return "CodeOffset<" + offset + ">";
}
public boolean equals(Object other) {
return other instanceof CodeOffset && ((CodeOffset) other).offset == this.offset;
}
public int hashCode() {
return offset * 13;
}
}
private static class Block {
public final int tag;
public final List<Object> contents;
public Block(int tag, List<Object> contents) {
this.tag = tag;
this.contents = contents;
}
public String toString() {
return "Block<" + tag + ": " + contents.toString() + ">";
}
}
private static class Section {
String name;
ByteBuffer data;
public Section(String name, ByteBuffer data) {
this.name = name;
this.data = data;
}
public String toString() {
return "Section<name=" + name + ", length=" + data.capacity() + ">";
}
public List<String> unstring() {
List<String> strings = new ArrayList<>();
for (int i = 0; i < this.data.capacity();) {
StringBuffer buf = new StringBuffer();
while (this.data.get(i) != 0) {
buf.append((char) this.data.get(i));
i += 1;
}
strings.add(buf.toString());
i += 1;
}
return strings;
}
private Object parseNextObject(List<Object> shared) throws Exception {
int nextTag = this.data.get() & (short) 0xff;
switch (nextTag) {
// integers
case 0x00: {
byte value = this.data.get();
return Long.valueOf(value);
}
case 0x01: {
short value = this.data.getShort();
return Long.valueOf(value);
}
case 0x02: {
int value = this.data.getInt();
return Long.valueOf(value);
}
case 0x03: {
long value = this.data.getLong();
return Long.valueOf(value);
}
// shared elements
case 0x04: {
long offset = this.data.get() & (long) 0xff;
return shared.get((int) offset);
}
case 0x05: {
long offset = this.data.getShort() & (long) 0xff;
return shared.get((int) offset);
}
case 0x06: {
long offset = this.data.getInt() & (long) 0xff;
return shared.get((int) offset);
}
// blocks
case 0x08: {
long header = this.data.getInt() & (long) 0xff;
int tag = (int) header & 0xff;
long size = header >> 10;
List<Object> elems = new ArrayList<>();
Block block = new Block(tag, elems);
if (size > 0) {
shared.add(block);
for (int i = 0; i < size; i++) {
elems.add(parseNextObject(shared));
}
}
return block;
}
case 0x13: {
throw new Exception("long block not supported");
}
// string
case 0x09: {
int len = this.data.get() & (short) 0xff;
byte[] buf = new byte[len];
this.data.get(buf);
String s = new String(buf);
shared.add(s);
return s;
}
case 0x0a: {
long len = this.data.getInt() & (long) 0xff;
byte[] buf = new byte[(int)len];
this.data.get(buf);
String s = new String(buf);
shared.add(s);
return s;
}
// float
case 0x0b:
case 0x0c: {
Double obj = Double.valueOf(this.data.getDouble());
shared.add(obj);
return obj;
}
case 0x0D:
case 0x0E: {
throw new Exception("double array not supported");
}
case 0x07:
case 0x0f: {
throw new Exception("double array not supported");
}
// misc
case 0x10: {
throw new Exception("code pointer with checksum");
}
case 0x11: {
throw new Exception("code pointer with closure");
}
case 0x12:
case 0x18:
case 0x19: {
StringBuffer buf = new StringBuffer();
while (true) {
int next = this.data.get() & (short) 0xff;
if (next == 0) {
break;
}
buf.append((char) next);
}
String name = buf.toString();
switch (name) {
// int64
case "_j": {
long v = Long.valueOf(this.data.getLong());
shared.add(v);
return v;
}
default:
throw new Exception("unknown custom op: " + name);
}
}
default: {
if (nextTag < 0x20) {
throw new Exception("invalid tag " + nextTag);
} else if (nextTag < 0x40) {
int length = nextTag & 0x1f;
byte[] buf = new byte[(int)length];
this.data.get(buf);
String s = new String(buf);
shared.add(s);
return s;
} else if (nextTag < 0x80) {
Long value = Long.valueOf(nextTag & 0x3f);
return value;
} else {
long size = (nextTag >> 4) & 0x07;
int tag = nextTag & 0x0f;
List<Object> elems = new ArrayList<>();
Block block = new Block(tag, elems);
if (size > 0) {
shared.add(block);
for (int i = 0; i < size; i++) {
elems.add(parseNextObject(shared));
}
}
return block;
}
}
}
}
public void unmarshal() throws Exception {
int magic = this.data.getInt(0);
if (magic != MARSHAL_MAGIC_SMALL) {
throw new Exception("bad marshal magic");
}
int byteLength = this.data.getInt(4);
int numObjs = this.data.getInt(8);
System.out.println(numObjs);
List<Object> shared = new ArrayList<>();
List<Object> objs = new ArrayList<>();
this.data.position(20);
while (this.data.position() < this.data.capacity()) {
Object next = parseNextObject(shared);
objs.add(next);
}
System.out.println(shared.size());
System.out.println(objs);
}
}
public static Section findSection(Section[] sections, String name) {
for (Section section : sections) {
if (section.name.equals(name)) {
return section;
}
}
return null;
}
public static void main(String[] args) throws Exception {
ByteBuffer buf;
int len;
{
FileInputStream in = new FileInputStream(new File(args[0]));
len = in.available();
buf = ByteBuffer.allocate(len);
Channels.newChannel(in).read(buf);
}
for (int i = 0; i < 12; i++) {
if (buf.get(len - 12 + i) != (byte) TRAILER_MAGIC.charAt(i)) {
throw new Exception("invalid trailer");
}
}
int numSections = buf.getInt(len - 16);
Section[] sections = new Section[numSections];
for (int i = numSections - 1, sectionBase = len - 16 - (numSections * 8); i >= 0; i--) {
int base = len - 16 - (numSections * 8) + (i * 8);
char[] name = new char[4];
name[0] = (char) buf.get(base + 0);
name[1] = (char) buf.get(base + 1);
name[2] = (char) buf.get(base + 2);
name[3] = (char) buf.get(base + 3);
int sectionLength = buf.getInt(base + 4);
sectionBase -= sectionLength;
byte[] data = new byte[sectionLength];
buf.position(sectionBase);
buf.get(data);
sections[i] = new Section(new String(name), ByteBuffer.wrap(data));
}
System.out.println(Arrays.toString(sections));
findSection(sections, "SYMB").unmarshal();
findSection(sections, "CRCS").unmarshal();
findSection(sections, "DATA").unmarshal();
}
}

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Makefile Normal file
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.PHONY: all run clean
all: Jocaml.class
run: Jocaml.class test.byte
java Jocaml test.byte
clean:
$(RM) *.class *.cmi *.byte *.cmo
test.byte: test.ml
ocamlfind ocamlc -linkpkg -o test.byte test.ml
%.class: %.java
javac $<

10
test.ml Normal file
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Printf.printf "hello world!\n"
let rec fac (n : int) : int =
if n <= 1 then
1
else
fac (n-1) * n;;
Printf.printf "fac 6 is %d\n" (fac 6)