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提交 c93bf7a6 authored 作者: Thomas Mueller's avatar Thomas Mueller
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JaQu: the plan is to support natural (pure Java) conditions.

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h2/src/docsrc/html/jaqu.html
浏览文件 @ c93bf7a6
...@@ -256,7 +256,26 @@ This is not possible using annotations. ...@@ -256,7 +256,26 @@ This is not possible using annotations.
Unlike XML mapping configuration, the configuration is integrated in the class itself. Unlike XML mapping configuration, the configuration is integrated in the class itself.
</p> </p>
<h2>Ideas</h2> <h2>Natural Syntax</h2>
<p>The plan is to support more natural (pure Java) syntax in conditions.
To do that, the condition class is de-compiled to a SQL condition.
A proof of concept decompiler is included (but it doesn't work yet).
The planned syntax is:
</p>
<pre>
long count = db.from(co).
where(new Filter() { public boolean where() {
return co.id == x
&amp;&amp; co.name.equals(name)
&amp;&amp; co.value == new BigDecimal("1")
&amp;&amp; co.amount == 1L
&amp;&amp; co.birthday.before(new java.util.Date())
&amp;&amp; co.created.before(java.sql.Timestamp.valueOf("2005-05-05 05:05:05"))
&amp;&amp; co.time.before(java.sql.Time.valueOf("23:23:23"));
} }).selectCount();
</pre>
<h2>Other Ideas</h2>
<p> <p>
This project has just been started, and nothing is fixed yet. This project has just been started, and nothing is fixed yet.
Some ideas for what to implement are: Some ideas for what to implement are:
......
h2/src/test/org/h2/test/jaqu/SamplesTest.java
浏览文件 @ c93bf7a6
...@@ -347,12 +347,12 @@ private void testComplexObject2(final int x, final String name) { ...@@ -347,12 +347,12 @@ private void testComplexObject2(final int x, final String name) {
long count = db.from(co). long count = db.from(co).
where(new Filter() { public boolean where() { where(new Filter() { public boolean where() {
return co.id == x return co.id == x
&& co.name.equals(name)
&& co.value == new BigDecimal("1")
&& co.amount == 1L && co.amount == 1L
&& co.birthday.before(new java.util.Date()) && co.birthday.before(new java.util.Date())
&& co.created.before(java.sql.Timestamp.valueOf("2005-05-05 05:05:05")) && co.created.before(java.sql.Timestamp.valueOf("2005-05-05 05:05:05"))
&& co.name.equals(name) && co.time.before(java.sql.Time.valueOf("23:23:23"));
&& co.time.before(java.sql.Time.valueOf("23:23:23"))
&& co.value == new BigDecimal("1");
} }).selectCount(); } }).selectCount();
// TODO should return only one object // TODO should return only one object
assertEquals(2, count); assertEquals(2, count);
......
h2/src/tools/org/h2/jaqu/Query.java
浏览文件 @ c93bf7a6
...@@ -14,6 +14,7 @@ import java.util.ArrayList; ...@@ -14,6 +14,7 @@ import java.util.ArrayList;
import java.util.HashMap; import java.util.HashMap;
import java.util.List; import java.util.List;
import org.h2.jaqu.util.ClassReader;
import org.h2.jaqu.util.Utils; import org.h2.jaqu.util.Utils;
//## Java 1.5 end ## //## Java 1.5 end ##
...@@ -178,6 +179,9 @@ public class Query<T> { ...@@ -178,6 +179,9 @@ public class Query<T> {
// // convert // // convert
// } // }
} }
// String filterQuery =
new ClassReader().decompile(filter, "where");
// System.out.println(filterQuery);
return new QueryWhere<T>(this); return new QueryWhere<T>(this);
} }
......
h2/src/tools/org/h2/jaqu/util/ClassReader.java 0 → 100644
浏览文件 @ c93bf7a6
/*
* Copyright 2004-2009 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.jaqu.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Stack;
/**
* This class converts a method to a SQL expression by interpreting
* (decompiling) the bytecode of the class.
*/
public class ClassReader {
private static final boolean DEBUG = false;
private byte[] data;
private int pos;
private int[] cpType;
private String[] cpString;
private int[] cpInt;
private int startByteCode;
private String methodName;
private String convertMethodName;
private String result;
private Stack<String> stack = new Stack<String>();
private ArrayList<String> variables = new ArrayList<String>();
private boolean end;
private boolean condition;
private int nextPc;
private void debug(String s) {
if (DEBUG) {
System.out.println(s);
}
}
public String decompile(Object instance, String methodName) {
this.convertMethodName = methodName;
Class< ? > clazz = instance.getClass();
String className = clazz.getName();
debug("class name " + className);
ByteArrayOutputStream buff = new ByteArrayOutputStream();
try {
InputStream in = clazz.getClassLoader().getResource(className.replace('.', '/') + ".class").openStream();
while (true) {
int x = in.read();
if (x < 0) {
break;
}
buff.write(x);
}
} catch (IOException e) {
throw new RuntimeException("Could not read class bytecode", e);
}
data = buff.toByteArray();
int header = readInt();
debug("header: " + Integer.toHexString(header));
int minorVersion = readShort();
int majorVersion = readShort();
debug("version: " + majorVersion + "." + minorVersion);
int constantPoolCount = readShort();
cpString = new String[constantPoolCount];
cpInt = new int[constantPoolCount];
cpType = new int[constantPoolCount];
for (int i = 1; i < constantPoolCount; i++) {
int tag = readByte();
cpType[i] = tag;
switch(tag) {
case 1:
cpString[i] = readString();
break;
case 3: {
int x = readInt();
cpString[i] = String.valueOf(x);
break;
}
case 4: {
int x = readInt();
cpString[i] = Float.toString(Float.intBitsToFloat(x));
cpInt[i] = x;
break;
}
case 5: {
long x = readLong();
cpString[i] = String.valueOf(x);
i++;
break;
}
case 6: {
long x = readLong();
cpString[i] = String.valueOf(Double.longBitsToDouble(x));
i++;
break;
}
case 7: {
int x = readShort();
cpString[i] = "class";
cpInt[i] = x;
break;
}
case 8: {
int x = readShort();
cpString[i] = "string";
cpInt[i] = x;
break;
}
case 9: {
int x = readInt();
cpString[i] = "field";
cpInt[i] = x;
break;
}
case 10: {
int x = readInt();
cpString[i] = "method";
cpInt[i] = x;
break;
}
case 11: {
int x = readInt();
cpString[i] = "interface method";
cpInt[i] = x;
break;
}
case 12: {
int x = readInt();
cpString[i] = "name and type";
cpInt[i] = x;
break;
}
default:
throw new Error("Unsupported constant pool tag: " + tag);
}
}
int accessFlags = readShort();
debug("access flags: " + accessFlags);
int classRef = readShort();
debug("class: " + cpString[cpInt[classRef]]);
int superClassRef = readShort();
debug(" extends " + cpString[cpInt[superClassRef]]);
int interfaceCount = readShort();
for (int i = 0; i < interfaceCount; i++) {
int interfaceRef = readShort();
debug(" implements " + cpString[cpInt[interfaceRef]]);
}
int fieldCount = readShort();
for (int i = 0; i < fieldCount; i++) {
readField();
}
int methodCount = readShort();
for (int i = 0; i < methodCount; i++) {
readMethod();
}
readAttributes();
return result;
}
private void readField() {
int accessFlags = readShort();
int nameIndex = readShort();
int descIndex = readShort();
debug(" " + cpString[descIndex] + " " + cpString[nameIndex] + " " + accessFlags);
readAttributes();
}
private void readMethod() {
int accessFlags = readShort();
int nameIndex = readShort();
int descIndex = readShort();
String desc = cpString[descIndex];
methodName = cpString[nameIndex];
debug(" " + desc + " " + methodName + " " + accessFlags);
readAttributes();
}
private void readAttributes() {
int attributeCount = readShort();
for (int i = 0; i < attributeCount; i++) {
int attributeNameIndex = readShort();
String attributeName = cpString[attributeNameIndex];
debug(" attribute " + attributeName);
int attributeLength = readInt();
int end = pos + attributeLength;
if ("Code".equals(attributeName)) {
readCode();
}
pos = end;
}
}
void decompile() {
int maxStack = readShort();
int maxLocals = readShort();
debug("stack: " + maxStack + " locals: " + maxLocals);
int codeLength = readInt();
startByteCode = pos;
int end = pos + codeLength;
while (pos < end) {
readByteCode();
}
debug("");
pos = startByteCode + codeLength;
int exceptionTableLength = readShort();
pos += 2 * exceptionTableLength;
readAttributes();
}
private void readCode() {
variables.clear();
stack.clear();
int maxStack = readShort();
int maxLocals = readShort();
debug("stack: " + maxStack + " locals: " + maxLocals);
int codeLength = readInt();
startByteCode = pos;
if (methodName.startsWith(convertMethodName)) {
result = getResult();
}
pos = startByteCode + codeLength;
int exceptionTableLength = readShort();
pos += 2 * exceptionTableLength;
readAttributes();
}
private String getResult() {
while (true) {
readByteCode();
if (end) {
return stack.pop();
}
if (condition) {
String c = stack.pop();
Stack<String> currentStack = new Stack<String>();
currentStack.addAll(stack);
ArrayList<String> currentVariables = new ArrayList<String>();
currentVariables.addAll(variables);
int branch = nextPc;
String a = getResult();
stack = currentStack;
variables = currentVariables;
pos = branch + startByteCode;
String b = getResult();
if (a.equals("0") && b.equals("1")) {
return c;
} else if (a.equals("1") && b.equals("0")) {
return "NOT(" +c + ")";
} else if (b.equals("0")) {
return "NOT(" + c + ") AND (" + a + ")";
} else if (a.equals("0")) {
return "(" + c + ") AND (" + b + ")";
} else if (b.equals("1")) {
return "(" + c + ") OR (" + a + ")";
} else if (a.equals("1")) {
return "NOT(" + c + ") AND (" + b + ")";
}
return "(" + c + ") ? (" + b + ") : (" + a + ")";
}
if (nextPc != 0) {
pos = nextPc + startByteCode;
}
}
}
private void readByteCode() {
int startPos = pos - startByteCode;
int opCode = readByte();
String op;
end = false;
condition = false;
nextPc = 0;
switch(opCode) {
case 0:
op = "nop";
break;
case 1:
op = "aconst_null";
stack.push("null");
break;
case 2:
op = "iconst_m1";
stack.push("-1");
break;
case 3:
op = "iconst_0";
stack.push("0");
break;
case 4:
op = "iconst_1";
stack.push("1");
break;
case 5:
op = "iconst_2";
stack.push("2");
break;
case 6:
op = "iconst_3";
stack.push("3");
break;
case 7:
op = "iconst_4";
stack.push("4");
break;
case 8:
op = "iconst_5";
stack.push("5");
break;
case 9:
op = "lconst_0";
stack.push("0");
break;
case 10:
op = "lconst_1";
stack.push("1");
break;
case 11:
op = "fconst_0";
stack.push("0.0");
break;
case 12:
op = "fconst_1";
stack.push("1.0");
break;
case 13:
op = "fconst_2";
stack.push("2.0");
break;
case 14:
op = "dconst_0";
stack.push("0.0");
break;
case 15:
op = "dconst_1";
stack.push("1.0");
break;
case 16: {
int x = (byte) readByte();
op = "bipush " + x;
stack.push("" + x);
break;
}
case 17: {
int x = (short) readShort();
op = "sipush " + x;
stack.push("" + x);
break;
}
case 18: {
String s = getConstant(readByte());
op = "ldc " + s;
stack.push(s);
break;
}
case 19: {
String s = getConstant(readShort());
op = "ldc_w " + s;
stack.push(s);
break;
}
case 20: {
String s = getConstant(readShort());
op = "ldc2_w " + s;
stack.push(s);
break;
}
case 21: {
int x = readByte();
op = "iload " + x;
stack.push(getVariable(x));
break;
}
case 22: {
int x = readByte();
op = "lload " + x;
stack.push(getVariable(x));
break;
}
case 23: {
int x = readByte();
op = "fload " + x;
stack.push(getVariable(x));
break;
}
case 24: {
int x = readByte();
op = "dload " + x;
stack.push(getVariable(x));
break;
}
case 25: {
int x = readByte();
op = "aload " + x;
stack.push(getVariable(x));
break;
}
case 26:
op = "iload_0";
stack.push(getVariable(0));
break;
case 27:
op = "iload_1";
stack.push(getVariable(1));
break;
case 28:
op = "iload_2";
stack.push(getVariable(2));
break;
case 29:
op = "iload_3";
stack.push(getVariable(3));
break;
case 30:
op = "lload_0";
stack.push(getVariable(0));
break;
case 31:
op = "lload_1";
stack.push(getVariable(1));
break;
case 32:
op = "lload_2";
stack.push(getVariable(2));
break;
case 33:
op = "lload_3";
stack.push(getVariable(3));
break;
case 34:
op = "fload_0";
stack.push(getVariable(0));
break;
case 35:
op = "fload_1";
stack.push(getVariable(1));
break;
case 36:
op = "fload_2";
stack.push(getVariable(2));
break;
case 37:
op = "fload_3";
stack.push(getVariable(3));
break;
case 38:
op = "dload_0";
stack.push(getVariable(0));
break;
case 39:
op = "dload_1";
stack.push(getVariable(1));
break;
case 40:
op = "dload_2";
stack.push(getVariable(2));
break;
case 41:
op = "dload_3";
stack.push(getVariable(3));
break;
case 42:
op = "aload_0";
stack.push(getVariable(0));
break;
case 43:
op = "aload_1";
stack.push(getVariable(1));
break;
case 44:
op = "aload_2";
stack.push(getVariable(2));
break;
case 45:
op = "aload_3";
stack.push(getVariable(3));
break;
case 46: {
String index = stack.pop();
String ref = stack.pop();
op = "iaload";
stack.push(ref + "[" + index + "]");
break;
}
case 47: {
String index = stack.pop();
String ref = stack.pop();
op = "laload";
stack.push(ref + "[" + index + "]");
break;
}
case 48: {
String index = stack.pop();
String ref = stack.pop();
op = "faload";
stack.push(ref + "[" + index + "]");
break;
}
case 49: {
String index = stack.pop();
String ref = stack.pop();
op = "daload";
stack.push(ref + "[" + index + "]");
break;
}
case 50: {
String index = stack.pop();
String ref = stack.pop();
op = "aaload";
stack.push(ref + "[" + index + "]");
break;
}
case 51: {
String index = stack.pop();
String ref = stack.pop();
op = "baload";
stack.push(ref + "[" + index + "]");
break;
}
case 52: {
String index = stack.pop();
String ref = stack.pop();
op = "caload";
stack.push(ref + "[" + index + "]");
break;
}
case 53: {
String index = stack.pop();
String ref = stack.pop();
op = "saload";
stack.push(ref + "[" + index + "]");
break;
}
case 54: {
int var = readByte();
op = "istore " + var;
setVariable(var, stack.pop());
break;
}
case 55: {
int var = readByte();
op = "lstore " + var;
setVariable(var, stack.pop());
break;
}
case 56: {
int var = readByte();
op = "fstore " + var;
setVariable(var, stack.pop());
break;
}
case 57: {
int var = readByte();
op = "dstore " + var;
setVariable(var, stack.pop());
break;
}
case 58: {
int var = readByte();
op = "astore " + var;
setVariable(var, stack.pop());
break;
}
case 59:
op = "istore_0";
setVariable(0, stack.pop());
break;
case 60:
op = "istore_1";
setVariable(1, stack.pop());
break;
case 61:
op = "istore_2";
setVariable(2, stack.pop());
break;
case 62:
op = "istore_3";
setVariable(3, stack.pop());
break;
case 63:
op = "lstore_0";
setVariable(0, stack.pop());
break;
case 64:
op = "lstore_1";
setVariable(1, stack.pop());
break;
case 65:
op = "lstore_2";
setVariable(2, stack.pop());
break;
case 66:
op = "lstore_3";
setVariable(3, stack.pop());
break;
case 67:
op = "fstore_0";
setVariable(0, stack.pop());
break;
case 68:
op = "fstore_1";
setVariable(1, stack.pop());
break;
case 69:
op = "fstore_2";
setVariable(2, stack.pop());
break;
case 70:
op = "fstore_3";
setVariable(3, stack.pop());
break;
case 71:
op = "dstore_0";
setVariable(0, stack.pop());
break;
case 72:
op = "dstore_1";
setVariable(1, stack.pop());
break;
case 73:
op = "dstore_2";
setVariable(2, stack.pop());
break;
case 74:
op = "dstore_3";
setVariable(3, stack.pop());
break;
case 75:
op = "astore_0";
setVariable(0, stack.pop());
break;
case 76:
op = "astore_1";
setVariable(1, stack.pop());
break;
case 77:
op = "astore_2";
setVariable(2, stack.pop());
break;
case 78:
op = "astore_3";
setVariable(3, stack.pop());
break;
case 79: {
// String value = stack.pop();
// String index = stack.pop();
// String ref = stack.pop();
op = "iastore";
// TODO side effect - not supported
break;
}
case 80:
op = "lastore";
// TODO side effect - not supported
break;
case 81:
op = "fastore";
// TODO side effect - not supported
break;
case 82:
op = "dastore";
// TODO side effect - not supported
break;
case 83:
op = "aastore";
// TODO side effect - not supported
break;
case 84:
op = "bastore";
// TODO side effect - not supported
break;
case 85:
op = "castore";
// TODO side effect - not supported
break;
case 86:
op = "sastore";
// TODO side effect - not supported
break;
case 87:
op = "pop";
stack.pop();
break;
case 88:
op = "pop2";
// TODO currently we don't know the stack types
stack.pop();
stack.pop();
break;
case 89: {
op = "dup";
String x = stack.pop();
stack.push(x);
stack.push(x);
break;
}
case 90: {
op = "dup_x1";
String a = stack.pop();
String b = stack.pop();
stack.push(a);
stack.push(b);
stack.push(a);
break;
}
case 91: {
// TODO currently we don't know the stack types
op = "dup_x2";
String a = stack.pop();
String b = stack.pop();
String c = stack.pop();
stack.push(a);
stack.push(c);
stack.push(b);
stack.push(a);
break;
}
case 92: {
// TODO currently we don't know the stack types
op = "dup2";
String a = stack.pop();
String b = stack.pop();
stack.push(b);
stack.push(a);
stack.push(b);
stack.push(a);
break;
}
case 93: {
// TODO currently we don't know the stack types
op = "dup2_x1";
String a = stack.pop();
String b = stack.pop();
String c = stack.pop();
stack.push(b);
stack.push(a);
stack.push(c);
stack.push(b);
stack.push(a);
break;
}
case 94: {
// TODO currently we don't know the stack types
op = "dup2_x2";
String a = stack.pop();
String b = stack.pop();
String c = stack.pop();
String d = stack.pop();
stack.push(b);
stack.push(a);
stack.push(d);
stack.push(c);
stack.push(b);
stack.push(a);
break;
}
case 95: {
op = "swap";
String a = stack.pop();
String b = stack.pop();
stack.push(a);
stack.push(b);
break;
}
case 96: {
String b = stack.pop();
String a = stack.pop();
op = "iadd";
stack.push("(" + a + " + " + b + ")");
break;
}
case 97: {
String b = stack.pop();
String a = stack.pop();
op = "ladd";
stack.push("(" + a + " + " + b + ")");
break;
}
case 98: {
String b = stack.pop();
String a = stack.pop();
op = "fadd";
stack.push("(" + a + " + " + b + ")");
break;
}
case 99: {
String b = stack.pop();
String a = stack.pop();
op = "dadd";
stack.push("(" + a + " + " + b + ")");
break;
}
case 100: {
String b = stack.pop();
String a = stack.pop();
op = "isub";
stack.push("(" + a + " - " + b + ")");
break;
}
case 101: {
String b = stack.pop();
String a = stack.pop();
op = "lsub";
stack.push("(" + a + " - " + b + ")");
break;
}
case 102: {
String b = stack.pop();
String a = stack.pop();
op = "fsub";
stack.push("(" + a + " - " + b + ")");
break;
}
case 103: {
String b = stack.pop();
String a = stack.pop();
op = "dsub";
stack.push("(" + a + " - " + b + ")");
break;
}
case 104: {
String b = stack.pop();
String a = stack.pop();
op = "imul";
stack.push("(" + a + " * " + b + ")");
break;
}
case 105: {
String b = stack.pop();
String a = stack.pop();
op = "lmul";
stack.push("(" + a + " * " + b + ")");
break;
}
case 106: {
String b = stack.pop();
String a = stack.pop();
op = "fmul";
stack.push("(" + a + " * " + b + ")");
break;
}
case 107: {
String b = stack.pop();
String a = stack.pop();
op = "dmul";
stack.push("(" + a + " * " + b + ")");
break;
}
case 108: {
String b = stack.pop();
String a = stack.pop();
op = "idiv";
stack.push("(" + a + " / " + b + ")");
break;
}
case 109: {
String b = stack.pop();
String a = stack.pop();
op = "ldiv";
stack.push("(" + a + " / " + b + ")");
break;
}
case 110: {
String b = stack.pop();
String a = stack.pop();
op = "fdiv";
stack.push("(" + a + " / " + b + ")");
break;
}
case 111: {
String b = stack.pop();
String a = stack.pop();
op = "ddiv";
stack.push("(" + a + " / " + b + ")");
break;
}
case 112: {
String b = stack.pop();
String a = stack.pop();
op = "irem";
stack.push("(" + a + " % " + b + ")");
break;
}
case 113: {
String b = stack.pop();
String a = stack.pop();
op = "lrem";
stack.push("(" + a + " % " + b + ")");
break;
}
case 114: {
String b = stack.pop();
String a = stack.pop();
op = "frem";
stack.push("(" + a + " % " + b + ")");
break;
}
case 115: {
String b = stack.pop();
String a = stack.pop();
op = "drem";
stack.push("(" + a + " % " + b + ")");
break;
}
case 116:
op = "ineg";
break;
case 117:
op = "lneg";
break;
case 118:
op = "fneg";
break;
case 119:
op = "dneg";
break;
case 120:
op = "ishl";
break;
case 121:
op = "lshl";
break;
case 122:
op = "ishr";
break;
case 123:
op = "lshr";
break;
case 124:
op = "iushr";
break;
case 125:
op = "lushr";
break;
case 126:
op = "iand";
break;
case 127:
op = "land";
break;
case 128:
op = "ior";
break;
case 129:
op = "lor";
break;
case 130:
op = "ixor";
break;
case 131:
op = "lxor";
break;
case 132: {
int var = readByte();
int off = (byte) readByte();
op = "iinc " + var + " " + off;
break;
}
case 133:
op = "i2l";
break;
case 134:
op = "i2f";
break;
case 135:
op = "i2d";
break;
case 136:
op = "l2i";
break;
case 137:
op = "l2f";
break;
case 138:
op = "l2d";
break;
case 139:
op = "f2i";
break;
case 140:
op = "f2l";
break;
case 141:
op = "f2d";
break;
case 142:
op = "d2i";
break;
case 143:
op = "d2l";
break;
case 144:
op = "d2f";
break;
case 145:
op = "i2b";
break;
case 146:
op = "i2c";
break;
case 147:
op = "i2s";
break;
case 148: {
String b = stack.pop(), a = stack.pop();
stack.push("SIGN(" + a + " - " + b + ")");
op = "lcmp";
break;
}
case 149:
op = "fcmpl";
break;
case 150:
op = "fcmpg";
break;
case 151:
op = "dcmpl";
break;
case 152:
op = "dcmpg";
break;
case 153:
condition = true;
nextPc = getAbsolutePos(pos, readShort());
stack.push("(" + stack.pop() + " = 0)");
op = "ifeq " + nextPc;
break;
case 154:
condition = true;
nextPc = getAbsolutePos(pos, readShort());
stack.push("(" + stack.pop() + " <> 0)");
op = "ifne " + nextPc;
break;
case 155:
condition = true;
nextPc = getAbsolutePos(pos, readShort());
stack.push("(" + stack.pop() + " < 0)");
op = "iflt " + nextPc;
break;
case 156:
condition = true;
nextPc = getAbsolutePos(pos, readShort());
stack.push("(" + stack.pop() + " >= 0)");
op = "ifge " + nextPc;
break;
case 157:
condition = true;
nextPc = getAbsolutePos(pos, readShort());
stack.push("(" + stack.pop() + " > 0)");
op = "ifgt " + nextPc;
break;
case 158:
condition = true;
nextPc = getAbsolutePos(pos, readShort());
stack.push("(" + stack.pop() + "<= 0)");
op = "ifle " + nextPc;
break;
case 159: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " = " + b + ")");
op = "if_icmpeq " + nextPc;
break;
}
case 160: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " <> " + b + ")");
op = "if_icmpne " + nextPc;
break;
}
case 161: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " < " + b + ")");
op = "if_icmplt " + nextPc;
break;
}
case 162: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " >= " + b + ")");
op = "if_icmpge " + nextPc;
break;
}
case 163: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " > " + b + ")");
op = "if_icmpgt " + nextPc;
break;
}
case 164: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " <= " + b + ")");
op = "if_icmple " + nextPc;
break;
}
case 165: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " = " + b + ")");
op = "if_acmpeq " + nextPc;
break;
}
case 166: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String b = stack.pop(), a = stack.pop();
stack.push("(" + a + " <> " + b + ")");
op = "if_acmpne " + nextPc;
break;
}
case 167:
nextPc = getAbsolutePos(pos, readShort());
op = "goto " + nextPc;
break;
case 168:
// TODO not supported yet
op = "jsr " + getAbsolutePos(pos, readShort());
break;
case 169:
// TODO not supported yet
op = "ret " + readByte();
break;
case 170: {
int start = pos;
pos += 4 - ((pos - startByteCode) & 3);
int def = readInt();
int low = readInt(), high = readInt();
int n = high - low + 1;
op = "tableswitch default:" + getAbsolutePos(start, def);
StringBuilder buff = new StringBuilder();
for (int i = 0; i < n; i++) {
buff.append(' ').append(low++).append(":").append(getAbsolutePos(start, readInt()));
}
op += buff.toString();
// pos += n * 4;
break;
}
case 171: {
int start = pos;
pos += 4 - ((pos - startByteCode) & 3);
int def = readInt();
int n = readInt();
op = "lookupswitch default:" + getAbsolutePos(start, def);
StringBuilder buff = new StringBuilder();
for (int i = 0; i < n; i++) {
buff.append(' ').append(readInt()).append(":").append(getAbsolutePos(start, readInt()));
}
op += buff.toString();
// pos += n * 8;
break;
}
case 172:
op = "ireturn";
end = true;
break;
case 173:
op = "lreturn";
end = true;
break;
case 174:
op = "freturn";
end = true;
break;
case 175:
op = "dreturn";
end = true;
break;
case 176:
op = "areturn";
end = true;
break;
case 177:
op = "return";
// no value returned
stack.push(null);
end = true;
break;
case 178:
op = "getstatic " + getField(readShort());
break;
case 179:
op = "putstatic " + getField(readShort());
break;
case 180: {
String field = getField(readShort());
String p = stack.pop();
p = p + "." + field.substring(Math.max(field.lastIndexOf('$'), field.lastIndexOf('.')) + 1, field.indexOf(' '));
if (p.startsWith("this.")) {
p = p.substring(5);
}
stack.push(p);
op = "getfield " + field;
break;
}
case 181:
op = "putfield " + getField(readShort());
break;
case 182: {
String method = getMethod(readShort());
op = "invokevirtual " + method;
if (method.equals("java/lang/String.equals (Ljava/lang/Object;)Z")) {
String a = stack.pop();
String b = stack.pop();
stack.push("(" + a + " = " + b + ")");
} else if (method.equals("java/lang/Integer.intValue ()I")) {
// ignore
} else if (method.equals("java/lang/Long.longValue ()J")) {
// ignore
}
break;
}
case 183:
op = "invokespecial " + getMethod(readShort());
break;
case 184:
op = "invokestatic " + getMethod(readShort());
break;
case 185: {
int methodRef = readShort();
readByte();
readByte();
op = "invokeinterface " + getMethod(methodRef);
break;
}
case 187:
op = "new " + cpString[cpInt[readShort()]];
break;
case 188:
op = "newarray " + readByte();
break;
case 189:
op = "anewarray " + cpString[readShort()];
break;
case 190:
op = "arraylength";
break;
case 191:
op = "athrow";
break;
case 192:
op = "checkcast " + cpString[readShort()];
break;
case 193:
op = "instanceof " + cpString[readShort()];
break;
case 194:
op = "monitorenter";
break;
case 195:
op = "monitorexit";
break;
case 196: {
opCode = readByte();
switch (opCode) {
case 21:
op = "wide iload " + readShort();
break;
case 22:
op = "wide lload " + readShort();
break;
case 23:
op = "wide fload " + readShort();
break;
case 24:
op = "wide dload " + readShort();
break;
case 25:
op = "wide aload " + readShort();
break;
case 54:
op = "wide istore " + readShort();
break;
case 55:
op = "wide lstore " + readShort();
break;
case 56:
op = "wide fstore " + readShort();
break;
case 57:
op = "wide dstore " + readShort();
break;
case 58:
op = "wide astore " + readShort();
break;
case 132: {
int var = readShort();
int off = (short) readShort();
op = "wide iinc " + var + " " + off;
break;
}
case 169:
op = "wide ret " + readShort();
break;
default:
throw new Error("unsupported wide opCode " + opCode);
}
break;
}
case 197:
op = "multianewarray " + cpString[readShort()] + " " + readByte();
break;
case 198: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String a = stack.pop();
stack.push("(" + a + " IS NULL)");
op = "ifnull " + nextPc;
break;
}
case 199: {
condition = true;
nextPc = getAbsolutePos(pos, readShort());
String a = stack.pop();
stack.push("(" + a + " IS NOT NULL)");
op = "ifnonnull " + nextPc;
break;
}
case 200:
op = "goto_w " + getAbsolutePos(pos, readInt());
break;
case 201:
op = "jsr_w " + getAbsolutePos(pos, readInt());
break;
default:
throw new Error("unsupported opCode " + opCode);
}
debug(" " + startPos + ": " + op);
}
private void setVariable(int x, String value) {
while (x >= variables.size()) {
variables.add("p" + variables.size());
}
variables.set(x, value);
}
private String getVariable(int x) {
if (x == 0) {
return "this";
}
while (x >= variables.size()) {
variables.add("p" + variables.size());
}
return variables.get(x);
}
private String getField(int fieldRef) {
int field = cpInt[fieldRef];
int classIndex = field >>> 16;
int nameAndType = cpInt[field & 0xffff];
String className = cpString[cpInt[classIndex]] + "." + cpString[nameAndType >>> 16] + " " + cpString[nameAndType & 0xffff];
return className;
}
private String getMethod(int methodRef) {
int method = cpInt[methodRef];
int classIndex = method >>> 16;
int nameAndType = cpInt[method & 0xffff];
String className = cpString[cpInt[classIndex]] + "." + cpString[nameAndType >>> 16] + " " + cpString[nameAndType & 0xffff];
return className;
}
private String getConstant(int constantRef) {
switch (cpType[constantRef]) {
case 3:
// int
return cpString[constantRef];
case 4:
// float
return cpString[constantRef];
case 5:
// long
return cpString[constantRef];
case 6:
// double
return cpString[constantRef];
case 8:
// string
// TODO escape
return "\"" + cpString[cpInt[constantRef]] + "\"";
default:
throw new Error("not a constant: " + constantRef);
}
}
private String readString() {
int size = readShort();
byte[] buff = data;
int p = pos, end = p + size;
char[] chars = new char[size];
int j = 0;
for (; p < end; j++) {
int x = buff[p++] & 0xff;
if (x < 0x80) {
chars[j] = (char) x;
} else if (x >= 0xe0) {
chars[j] = (char) (((x & 0xf) << 12) + ((buff[p++] & 0x3f) << 6) + (buff[p++] & 0x3f));
} else {
chars[j] = (char) (((x & 0x1f) << 6) + (buff[p++] & 0x3f));
}
}
pos = p;
return new String(chars, 0, j);
}
private int getAbsolutePos(int pos, int offset) {
return pos - startByteCode - 1 + (short) offset;
}
private int readByte() {
return data[pos++] & 0xff;
}
private int readShort() {
byte[] buff = data;
return ((buff[pos++] & 0xff) << 8) + (buff[pos++] & 0xff);
}
private int readInt() {
byte[] buff = data;
return (buff[pos++] << 24) + ((buff[pos++] & 0xff) << 16) + ((buff[pos++] & 0xff) << 8) + (buff[pos++] & 0xff);
}
private long readLong() {
return ((long) (readInt()) << 32) + (readInt() & 0xffffffffL);
}
}
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