I remember a professor once saying that interpreted code was about 10 times slower than compiled. What's the speed difference between interpreted and bytecode? (assuming that the bytecode isn't JIT compiled) I ask because some folks have been kicking around the idea of compiling vim script into bytecode and I just wonder what kind of pe...
hello well I hope Im not breaking some spamming rule here with this. I just asked a question about how the erlang compiler implements pattern matching, and I got some great responses, one of which is the compiled bytecode (obtained with a parameter passed to the c() directive): {function, match, 1, 2}. {label,1}. {func_info,{ato...
Say I have a string in php, that prints out to a text file like this: nÖ§9q1Fª£ How do I get the byte codes of this to my text file rather than the funky ascii characters? ...
When python compiles modules to bytecode, it produces .pyc files from your .py files. My question is, is it possible to have these .pyc files written to a different directory than where the module resides? For example, I have a large directory of modules. Rather than having it littered with .pyc files, I would like to keep my source c...
Hello world application that uses Flex, compiled with optimize=true has size 178K. How to reduce application size? We do not like to use RSL, we don't like to avoid Flex. Largest part of resulting SWF is unused bytecode. Are there any tools to optimize bytecode — drop unused methods, classes, give methods shorter names and so on? I kn...
I'm looking for ways/tools/projects to translate Java bytecode into other programming languages or, failing that, at least into a structured representation (like XML). Ideally open source, naturally. I've looked at ASM, the "bytecode manipulation and analysis framework". It doesn't support translation to other representations, but looks...
I have an app that was compiled with the built-in Eclipse "Compile" task. Then I decided to move the build procedure into Ant's javac, and the result ended being smaller files. Later I discovered that adjusting the debuglevel to "vars,lines,source" I could embed the same debug information that Eclipse did, and in a lot of cases files st...
Why is it so easy to decompile .NET IL-code into source code, compared to decompiling native x86 binaries? (Reflector produces quite good source code most of the time, while decompiling the output of a C++ compiler is almost impossible.) Is it because IL contains a lot of meta data? Or is it because IL is a higher abstraction than x86 ...
My compilers class is creating a language that we intend to compile to Java Bytecode. We have made plenty of progress and are nearing the time where it's time for code generation. We are having problems locating information on how to create .class files from our compiler. Do you have any resources that can give us some assistance? We al...
I am really having trouble finding a good working Lua bytecode decompiler. I'm trying to decompile some scripting files I found in a game but they appear to be compiled, yet don't seem impossible to decode. What's the best tool to decompile Lua binaries? ...
How is pattern matching in Scala implemented at bytecode level? Is it like a series of if (x instanceof Foo) constructs, or something else? What are its performance implications? For example, given the following code (from Scala By Example pages 46-48), how would the equivalent Java code for the eval method look like? abstract class Ex...
How does bytecode get verified in the JVM? ...
For CIL / MSIL, I can write the code in a text editor and compile / decompile with ilasm / ildasm. I can use Reflector to see the CIL generated by a .NET class. In the Java world, javap -c shows the disassembled byte code. How do I compile Java bytecode? (i.e. the Java equivalent of ilasm / ildasm). Is there an IDE that supports Java...
No The JIT compiler may "transform" the bytecode into something completely different anyway. It will lead you to do premature optimization. Yes You do not know which method will be compiled by the JIT, so it is better if you optimize them all. It will make you a better Java programmer. I am asking without really knowing (obviou...
In Python, I'd like to write a function that would pretty-print its results to the console if called by itself (mostly for use interactively or for debugging). For the purpose of this question, let's say it checks the status of something. If I call just check_status() I would like to see something like: Pretty printer status check 0....
Hi, What is the easiest way to convert a PHP script (.php) into OpCode/Bytecode (Operation Code) using C#? I can use DLLs if I have to. I need this to be done for the project I am working in order to analyze PHP code easier. Any thoughts or ideas are welcome. ...
"A bytecode program is normally executed by parsing the instructions one at a time. This kind of bytecode interpreter is very portable. Some systems, called dynamic translators, or "just-in-time" (JIT) compilers, translate bytecode into machine language as necessary at runtime: this makes the virtual machine unportable." A question ...
Why python compile the source to bytecode before interpreting? Why not interpret from the source directly? ...
suppose that no bytecode is generated for a program, like in Ruby, Perl, or PHP, in this case, is line 1 below re-interpreted every time the execution reach line 1 again? while ($indexArrayMoviesData < $countArrayMoviesData + $countNewlyAddedMoviesData) { # do something } that is, if the loop runs 100,000 times, then that line will ...
Problem: I have a method that compiles to over 8000 bytes of Java bytecode. HotSpot has a magic limit that makes the JIT not kick in for methods that exceed 8000 bytes. (Yes, it is reasonable to have a huge method. This is a tokenizer loop.) The method is in a library and I don't want to require users of the library to have to configure ...