共计 3015 个字符，预计需要花费 8 分钟才能阅读完成。
env: os:ubuntu 16.04 x64openjdk8u
//java.lang.String
package java.lang;
import java.lang.StringDebugHelper;
//…
public final class String{
final char value[];//remove private
public boolean equals(Object anObject) {
if (this == anObject) {
return true;
}
if (anObject instanceof String) {
// {replace begin
String anotherString = (String)anObject;
if(StringDebugHelper.Equals.isInAttention(this) || StringDebugHelper.Equals.isInAttention(anotherString)){
//new Throwable().getStackTrace();//not crash
//System.out.println(“xxxxx”);//not crash
new Throwable(“attention:”+this).printStackTrace();
}
//Thread.currentThread().getStackTrace();//crash
//new Throwable().getStackTrace();//crash
//new Exception(“uuuuuuuuuu”);//crash
//new String(“dddxx”);//not crash
//System.out.println(“xxxxx”);//crash
int n = value.length;
return StringDebugHelper.Equals.equals(this.value, anotherString.value);
//replace end}
}
return false;
}
}
package java.lang;
//import java.util.Set;
public class StringDebugHelper{
public static class Equals{
public static String[] attention;
public static boolean isInAttention(final String str){
if(attention==null) return false;
for(int i = 0; i < attention.length; i++){
if(null != attention[i] && StringDebugHelper.Equals.equals(attention[i].value, str.value))
return true;
}
return false;
}
public static boolean equals(final char [] thiz,final char [] anotherString) {
int n = thiz.length;
if (n == anotherString.length) {
char v1[] = thiz;
char v2[] = anotherString;
int i = 0;
while (n– != 0) {
if (v1[i] != v2[i])
return false;
i++;
}
return true;
}
return false;
}
}
}
import java.util.HashSet;
import java.util.Set;
public class StringDebugHelperTest{
public static void main(String[] args){
// to this before boot app {
String[] st = new String[5];
st[0] = “java”;
st[1] = “tsogvilin”;
StringDebugHelper.Equals.attention = st;
// }
// app content:
//”java”.equals(new String(“java”));
“tsogvilin”.equals(new String(“tsogvilin”));
}
}
#compile
javac -sourcepath main/src/ -d main/classes/ main/src/*.java
javac -Xbootclasspath/p:main/classes -d test/classes/ test/src/*.java
#run
java -Xbootclasspath/p:main/classes -cp test/classes T
java -Xbootclasspath/p:main/classes -cp test/classes StringDebugHelperTest
real exmaple :apktool:
#replace javac cmd:
mv /usr/lib/jvm/java-8-openjdk-amd64/bin/javac /usr/lib/jvm/java-8-openjdk-amd64/bin/javac.real
cat /usr/lib/jvm/java-8-openjdk-amd64/bin/javac
#!/bin/sh
/usr/lib/jvm/java-8-openjdk-amd64/bin/javac.real -Xbootclasspath/p:/home/z/hg_openjdk_java_net/jdk8u_jdk8u/str.eq.dbg/main/classes/ “$@”
Apktool/build.gradle:
tasks.withType(JavaCompile) {
options.compilerArgs += [“-Xlint:-options”]
// add this:
options.bootClasspath = “/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/home/z/hg_openjdk_java_net/jdk8u_jdk8u/str.eq.dbg/main/classes/” //add this
}
//Apktool/brut.apktool/apktool-cli/src/main/java/brut/apktool/Main.java:
// to this before boot app {
String[] st = new String[1];
st[0] = “resources.arsc”;
//st[1] = “tsogvilin”;
StringDebugHelper.Equals.attention = st;
System.out.println(“rrrrrrrrrrrrrrrrrr”);
// }
java -Xbootclasspath/p:main/classes -cp /home/z/a/Apktool/brut.apktool/apktool-cli/build/libs/apktool-cli-all.jar -Duser.language=en -Dfile.encoding=UTF8 brut.apktool.Main d ~/a/game.v182815.apk -o ~/a/myoutdir
