i want to execute a piece of bytecode so that it will run in a specific scope ? for example i want to be able to run this code label.x = 100+label.width and have it react to a label instance that is somewhere inside the compiled swf. i want the code have the 'this' keyword of my abc code to point to the parent of the label instance....
Hello Everybody, I am working on a project that requires me to generate a java ".class" file on the go that can be later on compiled on the JVM. After learning and working with MSIL (Microsoft IL) which is also a stack based intermediate programming language, the following are the problems I am facing : As compared to the IL (for C# or...
Is it possible to convert a .class file to .java file. If yes then how? What about the correctness of the code extracted from this option? ...
I am attempting to use the Java byte code engineering library ASM to perform static analysis. I have the situation where I would like to inspect the variables being assigned to a field. I have MethodVisitor which implements the visitFieldInsn() method. I am specifically looking for the putfield command. That is no problem. The problem i...
I'm trying to infer the number of bytecodes that the JVM "interprets"; In quotes because surely they are also compiled. Is there any way or JVMTI/JVMPI interface or instrumentation which can provide some sort of inferred metric on this? ...
I am writing a static analysis tool for an assignment, it analyses Java bytecode using the ASM library. One of the parts of ASM that we use requires (or at least, appears to require) that the class be loaded from the ClassLoader. We were hoping the tool would be able to analyse .class files without requiring them on the classpath. We al...
I am not working on an Eclipse plug-in project; however, I use an external library that generates an instance of org.eclipse.jdt.core.dom.CompilationUnit. Is there a way to generate Java bytecode from it? Some searching revealed that CompilationUnit's are typically built by registering a custom builder for the Eclipse project, then lett...
I had always assumed that the Python interpreter did no optimizations without a -O flag, but the following is a bit strange: >>> def foo(): ... print '%s' % 'Hello world' ... >>> from dis import dis >>> dis(foo) 2 0 LOAD_CONST 3 ('Hello world') 3 PRINT_ITEM 4 PRINT_NEW...
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.overlyusedcla...
Is it possible to distribute only the bytecode version (.pyc file) of a Python script instead of the original .py file? My app embeds the Python interpreter and calls PyImport_Import to load a script. How can I tell it to look for a .pyc file and import that? ...
This might be a silly question, but, given the output of, say.. >>> from dis import dis >>> def myfunc(x): ... print x ** 2 ... >>> dis(myfunc) 2 0 LOAD_FAST 0 (x) 3 LOAD_CONST 1 (2) 6 BINARY_POWER 7 PRINT_ITEM 8 PRINT...
Possible Duplicate: How to lock compiled Java Classes to prevent decompilation ...ideally combined with licensing? Our product is ported from PHP to Java. With PHP, there was a great code encryption / license tool named IONCube Encoder. It encrypts the PHP source code an allows the execution only if a appropriate license is pr...
If I make a class against a local namespace, how exactly does it work? For instance: >>> def foo(): ... i = 1 ... class bar(object): ... j = i ... return bar ... >>> dis(foo) 2 0 LOAD_CONST 1 (1) 3 STORE_DEREF 0 (i) 3 6 LOAD_CONST 2...
Hi, I heard many times that Java implemments JIT(just-in-time) compilation, and its bytecodes which are portable across platforms get "interpreted" by JVM. However, I don't really know what the bytecodes are, and what the JVM actually mean in Java language architecture; I would like to know more about them. ...
I have a .pyc file with no corresponding Python source code. I want to see the disassembly of the module using dis. I can import my module just fine with import dis import foo But to call dis.dis on it, I can't use the module object. I need the corresponding code object which backs foo. How do I create it? It seems that the compile bu...
If Python was so fast as C, the latter would be present in python apps/libraries? Example: if Python was fast as C would PIL be written completely in Python? ...
Given that I have the code object for a module, how do I get the corresponding module object? It looks like moduleNames = {}; exec code in moduleNames does something very close to what I want. It returns the globals declared in the module into a dictionary. But if I want the actual module object, how do I get it? EDIT: It looks like y...
Here's a test for fun with the ternary operator: public int so( final int a ) { int r = (int) System.currentTimeMillis(); r += a == 2 ? 1 : 0; return r; } Here's the bytecode produced: public int doIt(int); Code: 0: invokestatic #2; //Method java/lang/System.currentTimeMillis:()J 3: l2i 4: istore_2 ...
In my bytecode instrumentation project, I stumble frequently on VerifyErrors. However, the default java Verifier gives little information on which instruction resulted in the error (it only gives the method and a small message). Is there any stand-alone bytecode verifier which provides with a little more advanced help in locating the err...
I realize the benefits of bytecode vs. native code (portability). But say you always know that your code will run on a x86 architecture, why not then compile for x86 and get the performance benefit? Note that I am assuming there is a performance gain to native code compilation. Some folks have answered that there could in fact be ...