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QuestDB is High Performance Time Series Database
/*******************************************************************************
* ___ _ ____ ____
* / _ \ _ _ ___ ___| |_| _ \| __ )
* | | | | | | |/ _ \/ __| __| | | | _ \
* | |_| | |_| | __/\__ \ |_| |_| | |_) |
* \__\_\\__,_|\___||___/\__|____/|____/
*
* Copyright (c) 2014-2019 Appsicle
* Copyright (c) 2019-2020 QuestDB
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
package io.questdb.std;
import io.questdb.log.Log;
import io.questdb.log.LogFactory;
import io.questdb.std.ex.BytecodeException;
import io.questdb.std.str.AbstractCharSink;
import io.questdb.std.str.CharSink;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class BytecodeAssembler {
private static final int ACC_PUBLIC = 0x01;
private static final int ACC_PRIVATE = 0x02;
private static final Log LOG = LogFactory.getLog(BytecodeAssembler.class);
private static final int aload = 0x19;
private static final int aload_0 = 0x2a;
private static final int aload_1 = 0x2b;
private static final int aload_2 = 0x2c;
private static final int aload_3 = 0x2d;
private static final int istore = 0x36;
private static final int istore_0 = 0x3b;
private static final int istore_1 = 0x3c;
private static final int istore_2 = 0x3d;
private static final int istore_3 = 0x3e;
private static final int lstore = 0x37;
private static final int lstore_0 = 0x3f;
private static final int lstore_1 = 0x40;
private static final int lstore_2 = 0x41;
private static final int lstore_3 = 0x42;
private static final int iinc = 0x84;
private static final int lload = 0x16;
private static final int lload_0 = 0x1e;
private static final int lload_1 = 0x1f;
private static final int lload_2 = 0x20;
private static final int lload_3 = 0x21;
private static final int iload = 0x15;
private static final int iload_0 = 0x1a;
private static final int iload_1 = 0x1b;
private static final int iload_2 = 0x1c;
private static final int iload_3 = 0x1d;
private static final int iconst_m1 = 2;
private static final int iconst_0 = 3;
private static final int bipush = 0x10;
private static final int sipush = 0x11;
private static final int invokespecial = 183;
private static final int O_POOL_COUNT = 8;
private final Utf8Appender utf8Appender = new Utf8Appender();
private final CharSequenceIntHashMap utf8Cache = new CharSequenceIntHashMap();
private final ObjIntHashMap> classCache = new ObjIntHashMap<>();
private ByteBuffer buf;
private int poolCount;
private int objectClassIndex;
private int defaultConstructorNameIndex;
private int defaultConstructorDescIndex;
private int defaultConstructorMethodIndex;
private int codeAttributeIndex;
private int codeAttributeStart;
private int codeStart;
private int stackMapTableCut;
private Class host;
public BytecodeAssembler() {
this.buf = ByteBuffer.allocate(1024 * 1024).order(ByteOrder.BIG_ENDIAN);
this.poolCount = 1;
}
public void aload(int value) {
optimisedIO(aload_0, aload_1, aload_2, aload_3, aload, value);
}
public void append_frame(int itemCount, int offset) {
putByte(0xfc + itemCount - 1);
putShort(offset);
}
public void d2f() {
putShort(0x90);
}
public void d2i() {
putShort(0x8E);
}
public void d2l() {
putShort(0x8F);
}
public void defineClass(int thisClassIndex) {
defineClass(thisClassIndex, objectClassIndex);
}
public void defineClass(int thisClassIndex, int superclassIndex) {
// access flags
putShort(ACC_PUBLIC);
// this class index
putShort(thisClassIndex);
// super class
putShort(superclassIndex);
}
public void defineDefaultConstructor() {
defineDefaultConstructor(defaultConstructorMethodIndex);
}
public void defineDefaultConstructor(int superIndex) {
// constructor method entry
startMethod(defaultConstructorNameIndex, defaultConstructorDescIndex, 1, 1);
// code
aload(0);
putByte(invokespecial);
putShort(superIndex);
return_();
endMethodCode();
// exceptions
putShort(0);
// attribute count
putShort(0);
endMethod();
}
public void defineField(int nameIndex, int typeIndex) {
putShort(ACC_PRIVATE);
putShort(nameIndex);
putShort(typeIndex);
// attribute count
putShort(0);
}
public void dump(String path) {
try (FileOutputStream fos = new FileOutputStream(path)) {
int p = buf.position();
int l = buf.limit();
buf.flip();
fos.getChannel().write(buf);
buf.limit(l);
buf.position(p);
} catch (Exception e) {
e.printStackTrace();
}
}
public void endMethod() {
putInt(codeAttributeStart - 4, position() - codeAttributeStart);
}
public void endMethodCode() {
int len = position() - codeStart;
if (len > 64 * 1024) {
LOG.error().$("Too much input to generate ").$(host.getName()).$(". Bytecode is too long").$();
throw BytecodeException.INSTANCE;
}
putInt(codeStart - 4, position() - codeStart);
}
public void endStackMapTables() {
putInt(stackMapTableCut, position() - stackMapTableCut - 4);
}
public void f2d() {
putShort(0x8D);
}
public void f2i() {
putShort(0x8B);
}
public void f2l() {
putShort(0x8C);
}
public void fieldCount(int count) {
putShort(count);
}
public void finishPool() {
putShort(O_POOL_COUNT, poolCount);
}
public void full_frame(int offset) {
putByte(0xff);
putShort(offset);
}
public int getCodeStart() {
return codeStart;
}
public void getfield(int index) {
putByte(0xb4);
putShort(index);
}
public int goto_() {
return genericGoto(0xa7);
}
public void i2b() {
putShort(0x91);
}
public void i2d() {
putShort(0x87);
}
public void i2f() {
putShort(0x86);
}
public void i2l() {
putShort(0x85);
}
public void i2s() {
putShort(0x93);
}
public void iadd() {
putByte(0x60);
}
public void iconst(int v) {
if (v == -1) {
putByte(iconst_m1);
} else if (v > -1 && v < 6) {
putByte(iconst_0 + v);
} else if (v < 0) {
putByte(sipush);
putShort(v);
} else if (v < 128) {
putByte(bipush);
putByte(v);
} else {
putByte(sipush);
putShort(v);
}
}
public int if_icmpge() {
return genericGoto(0xa2);
}
public int if_icmpne() {
return genericGoto(0xa0);
}
public int ifne() {
return genericGoto(0x9a);
}
public void iinc(int index, int inc) {
putByte(iinc);
putByte(index);
putByte(inc);
}
public void iload(int value) {
optimisedIO(iload_0, iload_1, iload_2, iload_3, iload, value);
}
public void ineg() {
putByte(0x74);
}
public void init(Class host) {
this.host = host;
this.buf.clear();
this.poolCount = 1;
this.utf8Cache.clear();
this.classCache.clear();
}
public void interfaceCount(int count) {
putShort(count);
}
public void invokeInterface(int interfaceIndex, int argCount) {
putByte(185);
putShort(interfaceIndex);
putByte(argCount + 1);
putByte(0);
}
public void invokeStatic(int index) {
putByte(184);
putShort(index);
}
public void invokeVirtual(int index) {
putByte(182);
putShort(index);
}
public void irem() {
putByte(0x70);
}
public void ireturn() {
putByte(0xac);
}
public void istore(int value) {
optimisedIO(istore_0, istore_1, istore_2, istore_3, istore, value);
}
public void isub() {
putByte(0x64);
}
public void l2d() {
putShort(0x8A);
}
public void l2f() {
putShort(0x89);
}
public void l2i() {
putShort(0x88);
}
public void lcmp() {
putByte(0x94);
}
public void lconst_0() {
putByte(0x09);
}
public void ldc(int index) {
putByte(0x12);
putByte(index);
}
public void ldc2_w(int index) {
putByte(0x14);
putShort(index);
}
public void lload(int value) {
optimisedIO(lload_0, lload_1, lload_2, lload_3, lload, value);
}
public void lmul() {
putByte(0x69);
}
@SuppressWarnings("unchecked")
public Class loadClass(Class host) {
byte[] b = new byte[position()];
System.arraycopy(buf.array(), 0, b, 0, b.length);
return (Class) Unsafe.getUnsafe().defineAnonymousClass(host, b, null);
}
public void lreturn() {
putByte(0xad);
}
public void lstore(int value) {
optimisedIO(lstore_0, lstore_1, lstore_2, lstore_3, lstore, value);
}
public void methodCount(int count) {
putShort(count);
}
public T newInstance() {
Class x = loadClass(host);
try {
return x.newInstance();
} catch (Exception e) {
LOG.error().$("Failed to create an instance of ").$(host.getName()).$(", cause: ").$(e).$();
throw BytecodeException.INSTANCE;
}
}
public int poolClass(int classIndex) {
putByte(0x07);
putShort(classIndex);
return poolCount++;
}
public int poolClass(Class clazz) {
int index = classCache.keyIndex(clazz);
if (index > -1) {
String name = clazz.getName();
putByte(0x01);
int n;
putShort(n = name.length());
for (int i = 0; i < n; i++) {
char c = name.charAt(i);
if (c == '.') {
putByte('/');
} else {
putByte(c);
}
}
int result = poolClass(this.poolCount++);
classCache.putAt(index, clazz, result);
return result;
}
return classCache.valueAt(index);
}
public int poolField(int classIndex, int nameAndTypeIndex) {
return poolRef(0x09, classIndex, nameAndTypeIndex);
}
public int poolInterfaceMethod(Class clazz, String name, String sig) {
return poolInterfaceMethod(poolClass(clazz), poolNameAndType(poolUtf8(name), poolUtf8(sig)));
}
public int poolInterfaceMethod(int classIndex, String name, String sig) {
return poolInterfaceMethod(classIndex, poolNameAndType(poolUtf8(name), poolUtf8(sig)));
}
public int poolLongConst(long value) {
putByte(0x05);
putLong(value);
int index = poolCount;
poolCount += 2;
return index;
}
public int poolMethod(int classIndex, int nameAndTypeIndex) {
return poolRef(0x0A, classIndex, nameAndTypeIndex);
}
public int poolMethod(int classIndex, CharSequence methodName, CharSequence signature) {
return poolMethod(classIndex, poolNameAndType(poolUtf8(methodName), poolUtf8(signature)));
}
public int poolMethod(Class clazz, CharSequence methodName, CharSequence signature) {
return poolMethod(poolClass(clazz), poolNameAndType(poolUtf8(methodName), poolUtf8(signature)));
}
public int poolNameAndType(int nameIndex, int typeIndex) {
return poolRef(0x0C, nameIndex, typeIndex);
}
public int poolStringConst(int utf8Index) {
putByte(0x8);
putShort(utf8Index);
return poolCount++;
}
public Utf8Appender poolUtf8() {
putByte(0x01);
utf8Appender.lenpos = position();
utf8Appender.utf8len = 0;
putShort(0);
return utf8Appender;
}
public int poolUtf8(CharSequence cs) {
int index = utf8Cache.keyIndex(cs);
if (index > -1) {
putByte(0x01);
int n = cs.length();
int pos = buf.position();
putShort(0);
for (int i = 0; i < n; ) {
final char c = cs.charAt(i++);
if (c < 128) {
putByte(c);
} else {
if (c < 2048) {
putByte((char) (192 | c >> 6));
putByte((char) (128 | c & 63));
} else if (Character.isSurrogate(c)) {
i = encodeSurrogate(c, cs, i, n);
} else {
putByte((char) (224 | c >> 12));
putByte((char) (128 | c >> 6 & 63));
putByte((char) (128 | c & 63));
}
}
}
buf.putShort(pos, (short) (buf.position() - pos - 2));
utf8Cache.putAt(index, cs, poolCount);
return this.poolCount++;
}
return utf8Cache.valueAt(index);
}
public void pop() {
putByte(0x57);
}
public int position() {
return buf.position();
}
public void putByte(int b) {
if (buf.remaining() == 0) {
resize();
}
buf.put((byte) b);
}
public void putITEM_Integer() {
putByte(0x01);
}
public void putITEM_Long() {
putByte(0x04);
}
public void putITEM_Object(int classIndex) {
putByte(0x07);
putShort(classIndex);
}
public void putITEM_Top() {
putByte(0);
}
public void putLong(long value) {
if (buf.remaining() < 4) {
resize();
}
buf.putLong(value);
}
public void putShort(int v) {
putShort((short) v);
}
public void putShort(int pos, int v) {
buf.putShort(pos, (short) v);
}
public void putfield(int index) {
putByte(181);
putShort(index);
}
public void return_() {
putByte(0xb1);
}
public void same_frame(int offset) {
if (offset < 64) {
putByte(offset);
} else {
putByte(251);
putShort(offset);
}
}
public void setJmp(int branch, int target) {
putShort(branch, target - branch + 1);
}
public void setupPool() {
// magic
putInt(0xCAFEBABE);
// version
putInt(0x33);
// skip pool count, write later when we know the value
putShort(0);
// add standard stuff
objectClassIndex = poolClass(Object.class);
defaultConstructorMethodIndex = poolMethod(objectClassIndex, poolNameAndType(
defaultConstructorNameIndex = poolUtf8(""),
defaultConstructorDescIndex = poolUtf8("()V"))
);
codeAttributeIndex = poolUtf8("Code");
}
public void startMethod(int nameIndex, int descriptorIndex, int maxStack, int maxLocal) {
// access flags
putShort(ACC_PUBLIC);
// name index
putShort(nameIndex);
// descriptor index
putShort(descriptorIndex);
// attribute count
putShort(1);
// code
putShort(codeAttributeIndex);
// attribute len
putInt(0);
// come back to this later
this.codeAttributeStart = position();
// max stack
putShort(maxStack);
// max locals
putShort(maxLocal);
// code len
putInt(0);
this.codeStart = position();
}
public void startStackMapTables(int attributeNameIndex, int frameCount) {
putShort(attributeNameIndex);
this.stackMapTableCut = position();
// length - we will come back here
putInt(0);
// number of entries
putShort(frameCount);
}
private int encodeSurrogate(char c, CharSequence in, int pos, int hi) {
int dword;
if (Character.isHighSurrogate(c)) {
if (hi - pos < 1) {
putByte('?');
return pos;
} else {
char c2 = in.charAt(pos++);
if (Character.isLowSurrogate(c2)) {
dword = Character.toCodePoint(c, c2);
} else {
putByte('?');
return pos;
}
}
} else if (Character.isLowSurrogate(c)) {
putByte('?');
return pos;
} else {
dword = c;
}
putByte((char) (240 | dword >> 18));
putByte((char) (128 | dword >> 12 & 63));
putByte((char) (128 | dword >> 6 & 63));
putByte((char) (128 | dword & 63));
return pos;
}
private int genericGoto(int cmd) {
putByte(cmd);
int pos = position();
putShort(0);
return pos;
}
private void optimisedIO(int code0, int code1, int code2, int code3, int code, int value) {
switch (value) {
case 0:
putByte(code0);
break;
case 1:
putByte(code1);
break;
case 2:
putByte(code2);
break;
case 3:
putByte(code3);
break;
default:
putByte(code);
putByte(value);
break;
}
}
private int poolInterfaceMethod(int classIndex, int nameAndTypeIndex) {
return poolRef(0x0B, classIndex, nameAndTypeIndex);
}
private int poolRef(int op, int name, int type) {
putByte(op);
putShort(name);
putShort(type);
return poolCount++;
}
private void putInt(int pos, int v) {
buf.putInt(pos, v);
}
private void putInt(int v) {
if (buf.remaining() < 4) {
resize();
}
buf.putInt(v);
}
private void putShort(short v) {
if (buf.remaining() < 2) {
resize();
}
buf.putShort(v);
}
private void resize() {
ByteBuffer b = ByteBuffer.allocate(buf.capacity() * 2).order(ByteOrder.BIG_ENDIAN);
System.arraycopy(buf.array(), 0, b.array(), 0, buf.capacity());
b.position(buf.position());
buf = b;
}
public class Utf8Appender extends AbstractCharSink implements CharSink {
private int utf8len = 0;
private int lenpos;
public int $() {
putShort(lenpos, utf8len);
return poolCount++;
}
@Override
public Utf8Appender put(CharSequence cs) {
int n = cs.length();
for (int i = 0; i < n; i++) {
BytecodeAssembler.this.putByte(cs.charAt(i));
}
utf8len += n;
return this;
}
@Override
public Utf8Appender put(char c) {
BytecodeAssembler.this.putByte(c);
utf8len++;
return this;
}
@Override
public CharSink put(char[] chars, int start, int len) {
for (int i = 0; i < len; i++) {
BytecodeAssembler.this.putByte(chars[i + start]);
}
utf8len += len;
return this;
}
@Override
public Utf8Appender put(int value) {
super.put(value);
return this;
}
}
}