bytecode

I'm currently writing a toy compiler targeting Java bytecode in the translation. I would like to know if there is some kind of catalog, maybe a summary, of various simple peephole optimizations that can be made in the emitted bytecode before writing the .class file. I actually am aware of some libraries that have this functionality, but I'd like to implement that myself. You are aware of Proguard? http://proguard.sourceforge.net/ This is a great bytecode optimizer which implements a lot of optimizations. See the FAQ for a list: http://proguard.sourceforge.net/FAQ.html Evaluate constant

Sometimes, in Eclipse , i press a combination of keys which take me to the editor page that shows contents of my .class file (bytecode). I never seem to be able to remember what that key combination is. Can someone please let me know? Or in other words, how can one see own bytecode? Mark Peters Eclipse's default class file viewer shows the source (see VonC's answer) if it has been associated with the binaries, otherwise it gives a javap-like view of the class (with an option to attach source). I'm guessing it's the latter that you are looking for. I've never found a way to cleanly force

I'm wondering how is scala generating byte code, does it use some libraries like ASM? Or just write binary to .class files for performance? Starting with 2.10 the Scala compiler uses ASM 4 to emit bytecode, supporting -target:jvm-1.5 , -target:jvm-1.6 , and -target:jvm-1.7 Implementation aspects of the backend are described in: Emitting Scala classfiles via ASM http://lamp.epfl.ch/~magarcia/ScalaCompilerCornerReloaded/2012Q2/GenASM.pdf The bytecode emitter (GenASM, source linked below) visits a Control Flow Graph (CFG) built by a previous phase, and uses the Streaming ASM API to directly emit

I want to verify binary compatibility between 2 JARs. Following the suggestions in this answer I used jboss tattletale but it can find only missing classes. How can I find if there are missing methods? Is it possible at all? E.g. "Depends - on" class Foo depends on Bar (like many other middle class workers) import org.overlyusedclassnames.Bar public class Foo{ public void someMethod(){ Bar tender = new Bar(); tender.getJohnnyRedLabel(); tender.getJohnnyBlueLabel(); //this method is new in the Bar class } } "Compile time" class package org.overlyusedclassnames; /** * @Since 1992 * Changes:

I'm looking to write a short program (maybe a Hello World) in Java bytecode. I just want to write the bytecode using my text editor and run it. How would I do this? Got an example? Thanks! You could try Jasmin ! .class public HelloWorld .super java/lang/Object .method public static main([Ljava/lang/String;)V .limit stack 3 .limit locals 1 getstatic java/lang/System/out Ljava/io/PrintStream; ldc "Hello World." invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V return .end method You compile it using: > java -jar jasmin.jar hello.j And then you run it like any class: > java

Have there been incompatibilities between Java releases where Java source code/Java class files targeting Java version X won't compile/run under version Y (where Y > X) ? By "Java release" I mean versions such as: JDK 1.0 (January, 1996) JDK 1.1 (February, 1997) J2SE 1.2 (December, 1998) J2SE 1.3 (May, 2000) J2SE 1.4 (February, 2002) J2SE 5.0 (September, 2004) Java SE 6 (December, 2006) House rules: Please include references and code examples where possible. Please try to be very specific/concrete in your answer. A class that is being marked as @Deprecated does not count as a backwards

I'm trying to compile a lua script that calls some exported functions, save the resulting bytecode to a file and then load this bytecode and execute it, but I haven't found any example on how to do this. Is there any example available on how to do this? How can I do this? Edit: I'm using Lua + Luabind (C++) This is all very simple. First, you load the Lua script without executing it. It does not matter if you have connected the Lua state with your exported functions; all you're doing is compiling the script file. You could use luaL_loadfile , which uses C-standard library functions to read a

I'm new to .Net and I'm trying to understand the basics first. What is the difference between MSIL and Java bytecode? Motti First off let me say that I don't think that the subtle differences between Java bytecode and MSIL is something that should bother a novice .NET developer. They both serve the same purpose of defining an abstract target machine which is a layer above the physical machine being used in the end. MSIL and Java bytecode are very similar, in fact there is a tool called Grasshopper which translates MSIL to Java bytecode, I was part of the development team for Grasshopper so I