procyon | Java metaprogramming tools , including a rich reflection API | Reflection library
kandi X-RAY | procyon Summary
kandi X-RAY | procyon Summary
Procyon is a suite of Java metaprogramming tools focused on code generation and analysis. It includes the following libraries:. The Procyon libraries are available from Maven Central under group ID org.bitbucket.mstrobel.
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Top functions reviewed by kandi - BETA
- Compute the stack map for the given method body
- Compute the delta between two frames
- Sets a local variable
- Pushes a new frame
- Visit a switch statement
- Sets if this token is a YIELD token
- Generates an Iterable that contains only elements that match the given predicate
- Rewrite a switch statement
- Visit a BinaryExpression
- Return the description of this method
- Visits a binary expression
- Returns the set of binding flags
- Handles a UnaryOperatorExpression
- Makes the given visitor visit this instruction
- Visits a method declaration
- Visits a UnaryExpression node
- Overrides the visitor to look for a switch statement
- Handles an InvocationExpression
- Main entry point
- Overrides the visitor to visit a switch statement
- Visit a try catch block
- Visits a type declaration node
- Visit an InvocationExpression
- Exports the graph to a file
- Selects the best method matching the given parameters
- Visit a try - catch block
procyon Key Features
procyon Examples and Code Snippets
Community Discussions
Trending Discussions on procyon
QUESTION
So I have this code where I will put 12 boxes inside a div in a row but 1 box can't fit inside.
...ANSWER
Answered 2021-Apr-17 at 08:14one of your box is out of the row because there no space left for it, You can simply reduce each purple box size to produce some space for the outered box. Moreover another problem is that your out of row box is also out of the parent div border. To include all boxes inside the parent div border, remove height from div selector, so that the parent div can take as much height as needed to cover all of its child divs. You can watch the final result on my codepen
QUESTION
I wrote a JMH test about the cost of new instruction, and checked the class files it generates. Except the usual classes, there're tons of derived classes in generated folder:
This really shocked me, for just few annotations will lead to so many class bounded together through inheritance. I am curious about what things are in those class, so I use a decompile tool (BTW I learned this tool from one talk on KotlinConf 2019) called procyon to decompile these generated class, most of them are control related, like measure time (they are explicitly specified can't be inlined) and collect metrics. But there're tons of weird boolean in those class:
there're many booleans in other generted class files as well. I googled this, and seems they're somewhat derived from JMH sourse code. So I want to ask what is these booleans used for? I will assume they are closely related to the working principle underlying the JMH... seems no comments about the booleans in JMH source code.
Also, any suggestions about improving the JMH test I mentioned from the very beginning...? I know testing such thing can be very tricky and vulnerable, so I don't know if they are accurate, or reliable enough.
Many thanks.
...ANSWER
Answered 2020-Jan-21 at 19:50Just guessing.
As you can see, the booleans are private and unused in the source file. They might be used somewhere via reflection, but I'd bet they aren't. So the only thing left is ensuring that markerBegin and the other field belong to a different cache in order to prevent false sharing.
QUESTION
Good afternoon,
I am working on a website for a friend's gaming fansite. Utilizing a URI function and ajax URL loads, I'm setting it up so when they visit a page, the URL changes and that page's content loads, while leaving the top portion of the website static. The logo, radio box and navigation bar is the static portion.
Everything is working as intended so far, but when a page is used that's using a specific ID, it loads up a blank page. I'll show what I've done with the Badges page for an example.
Here's my HTACCESS:
...ANSWER
Answered 2018-Jul-13 at 04:40After discussing in chat, the solution was to remove the RewriteRule ^badges/([0-9]+)/?$ badges.php?id=$1 [L] from the htaccess. Any url that doesn't have a .php renders only the content portion of #contfill.
We then needed to modify the url the ajax uses in index.php, to convert the route from '/badges/324' to '/badges.php?id=324'
QUESTION
I was running Diffoscope on Ubuntu Bionic and when I turned on the debug log (--debug) I noticed many lines like these (one per .class file in the JAR):
ANSWER
Answered 2018-Jul-06 at 19:33From reading the Python sources of diffoscope, I figured out that diffoscope was expecting an executable named procyon-decompiler in the path.
/usr/lib/python3/dist-packages/diffoscope/comparators/java.py:L40:
QUESTION
I'm using a Digital Ocean server to facilitate online multiplayer in my PC game. The server is a small application written in Java. The problem is that the server keeps going down occasionally and restarts itself automatically after about 15 minutes. I have upgraded the server a couple of times but it didn't seem to make any difference, finally I'm using a CPU Optimized Droplet with 4 GB memory 2 vCPUs and 20 GB disk. I'm not completely sure but it seemed that the server went down when there were about 15 people online, but at times there are the same amount of people online (or more) and no crash occurs. It crashes about 1-2 times a day when most people are online.
Graphs:
-1 minute after server crashed (7:29 pm) : https://imgur.com/a/Asit3O6
-Server down for 12 minutes (7:41 pm): https://imgur.com/a/ulIgTau
-Server back online (7:50 pm): https://imgur.com/a/gMOn4Jf
-Server back online for 28 minutes (8:18 pm): https://imgur.com/a/lA8dufN
Console:
-After server crashed (7:39 Pm): https://imgur.com/a/h7r701H it shows:
...ANSWER
Answered 2018-Jun-11 at 04:25According to JavaDocs#ConcurrentModificationException:
Note that this exception does not always indicate that an object has been concurrently modified by a different thread. If a single thread issues a sequence of method invocations that violates the contract of an object, the object may throw this exception. For example, if a thread modifies a collection directly while it is iterating over the collection with a fail-fast iterator, the iterator will throw this exception.
And you are removing Main.servers_.remove(ipServer) while iterating on this line:
QUESTION
I am trying to do a simple Java bytecode obfuscator which works by replacing GOTO instructions with simple conditional jumps, say, if 10 != 15 GOTO else throw IllegalStateException. My current code is:
ANSWER
Answered 2018-Jan-18 at 18:33You are inserting an exception handler after the instruction, but when the instruction is a conditional branch, i.e. IFLE or IFGE, the branch might not be taken and the code flow continues after the instruction, running into the exception handler.
This creates an inconsistent state as the exception handler expects a Throwable on the stack which doesn’t exist when the code flow continues after the instrumented instruction. But of course, you do not want to execute the exception handler in that case, so you have to insert another GOTO, from l2 to l5 if I got it right.
This is not a problem when instrumenting GOTO instructions, which never proceed after the instruction.
At this place, I’d recommend a different coding style. Inserting before and after different reference nodes makes it impossible to predict the actual code structure when reading your code. It would be much more maintainable, if you just inserted a linear list of instructions using only one reference node.
QUESTION
I'm trying to decompile specific classes from a jar file using the com.strobel.decompiler.Decompiler decompiler from the Procyon library.
This is my current approach:
...ANSWER
Answered 2017-Mar-19 at 22:50The answer is simple: class namespaces are not prefixed with . then with / instead.
So just replacing Decompiler.decompile("com/myjar/foo", ...) works fine. Sorry
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install procyon
You can use procyon like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the procyon component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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