bytecode

问题 Groovy can access private methods and variables of a Java class. How does Groovy do this behind the scene? Is it because of the use of invokedynamic bytecode instruction which is used by MethodHandle class? I think Java uses invokespecial instruction for calling private methods and invokevirtual for public right which respects access modifiers? 回答1: Groovy is written in Java, so it hopefully doesn't rely on the byte code directly, it doesn't it using the Reflection API. For more details check

问题 This question already has answers here : Java API to find out the JDK version a class file is compiled for? (8 answers) Closed 6 years ago . I have a situation where the deployment platform is Java 5 and the development happens with Eclipse under Java 6 where we have established a procedure of having a new workspace created when beginning work on a given project. One of the required steps is therefore setting the compiler level to Java 5, which is frequently forgotten. We have a test machine

问题 I'm interested in making a language to run on the AVM2 and I'm looking for advice on where to start. I do realize that this is by no means a trivial task, but I would like to give it a try and at the very least learn more about implementing a language along the way. I have messed around with ANTLR and have been reading up on syntax issues for language development. What I'm looking for is advice on a path to take or useful references/books. For instance I would like to generate (script

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . Type-specific Java bytecode instructions have single-character prefixes to specify the type that the instruction relates to. Taken from Wikipedia's entry on Java bytecode In each case, the prefix choice makes sense, consisting of the first letter of the type (except boolean, which doesn't have an instruction

问题 Where is information such as if a local variable is "final" stored in Java bytecode? I know that for fields (global variables) and methods these are found in the access flag bits, but cannot seem to find the equivalent in the local variable table. I am interested in this question as I am using BCEL to check if a local variable is final, and have found the equivalent for fields, methods and classes in the class AccessFlags. Thanks in advance. 回答1: The finality of local variables is checked by

问题 In Python you have the ability to view the compiled bytecode of a user-defined function using dis . Is there a builtin equivalent to this for Lua? It would really useful! 回答1: The luac utility that comes with standard lua can create an assembly listing from Lua source using its -l option. For example, compiling from source on stdin : C:...> echo a=b | luac -l - main (3 instructions, 12 bytes at 00334C30) 0+ params, 2 slots, 0 upvalues, 0 locals, 2 constants, 0 functions 1 [1] GETGLOBAL 0 -2 ;

问题 I am using maven for Eclipse to build a jar that will run on a remote server. My system is running OS X, the server is running CestOS. For the project I need tensorflow library. Maven successfully resolves dependencies so I am able to run the project locally. However, on the server I am getting error that tensorflow library is not there because by default maven includes only macosx version. How can I force maven to substitute macosx version of tensorflow by the linux version during build?

问题 what is the difference between working of cglib and javaassist Does cglib creates proxies runtime? How does javaassist creates proxies? What is bytecode instrumentation? How hibernate uses these libraries? 回答1: The best bytecode manipulation library is ASM (http://asm.ow2.org/). It's really fast and simple to understand. 回答2: Byte Buddy is a code generation library for creating Java classes during the runtime of a Java application and without the help of a compiler. Other than the code

问题 I'm having difficulty understanding the documentation for Byte Buddy. To help me learn the API I would like to generate the byte code equivalent of this Java: public final class GeneratedByByteBuddy { private final int a; public GeneratedByByteBuddy(final int a) { this.a = a; } } I've had difficulty working out the right way to use Instrumentation to create the field assignment. 回答1: You are creating a class with customized byte code. For this, you cannot use a built-in Instrumentation but

问题 Let's say I have a Fraction class: class Fraction { ... /** Invert current fraction */ public Fraction inverse() { return new Fraction(den,num); } ... } And this is what the bytecode of the above method turns out to be: 0 new #1 <xyzTestes/system/fraction/Fraction> 3 dup 4 aload_0 5 getfield #16 <xyzTestes/system/fraction/Fraction.den> 8 aload_0 9 getfield #14 <xyzTestes/system/fraction/Fraction.num> 12 invokespecial #27 <xyzTestes/system/fraction/Fraction.<init>> 15 areturn I'm trying to