bytecode

问题 After creating the project when i run the react-native app, it gives me this error. FAILURE: Build failed with an exception. * What went wrong: A problem occurred configuring project ':app'. > Failed to notify project evaluation listener. > Uninitialized object exists on backward branch 142 Exception Details: Location: com/android/build/gradle/internal/pipeline/VariantInfoImpl.<init>(Lcom/android/build/gradle/internal/scope/VariantScope;)V @200: goto Reason: Error exists in the bytecode

问题 Given a C Python frame pointer, how do I look at arbitrary evaluation stack entries? (Some specific stack entries can be found via locals() , I'm talking about other stack entries.) I asked a broader question like this a while ago: getting the C python exec argument string or accessing the evaluation stack but here I want to focus on being able to read CPython stack entries at runtime. I'll take a solution that works on CPython 2.7 or any Python later than Python 3.3. However if you have

问题 Given a C Python frame pointer, how do I look at arbitrary evaluation stack entries? (Some specific stack entries can be found via locals() , I'm talking about other stack entries.) I asked a broader question like this a while ago: getting the C python exec argument string or accessing the evaluation stack but here I want to focus on being able to read CPython stack entries at runtime. I'll take a solution that works on CPython 2.7 or any Python later than Python 3.3. However if you have

问题 Hi. I want to find the range of instructions between the start and the end of a method-call. I do not want to simply just change the method-call owner/name/desc. With the expected result, I want to be able to do: Completely remove a method call Modify the method call by adding new arguments either in-front or after I've been trying different techniques to achieve this: ASM Analyzer (using SourceInterpreter) Looping the instruction set, forward and reversed, to try and locate the start and end

问题 ByteCode：ldc pushes a one-word constant onto the operand stack. ldc takes a single parameter, , which is the value to push. Most of the bytecodes in JVM can figure out their name by the code description. However, the ldc, I don't see any clue. 回答1: I suppose it is LoaD Constant but I do not have any reference. 回答2: It is Load Constant. It loads an item from the constant pool onto the stack. The available types are: int float java.lang.String java.lang.Class The Java 7 JVM added java.lang

问题 Faced this java.lang.VerifyError with code snippet as below during JVM loading bytecode. try{ ----- } catch (NumberFormatException|CalculationException e) { } Here CalculationException is custom exception which extends java.lang.RuntimeException, while NumberFormatException is standard Java RuntimeException. While the code compile and run fine locally windows machine. It fails with VerifyError on one of the QA/prod/Dev unix node, and works fine on other unix node. While both unix nodes have

问题 I was looking into how the Java bytecode worked, and I started on Wikipedia. On the page focusing on the .class file, it mentions 11 constant types that appear in the Constant Pool. However, in The Java Virtual Machine Specifications (JVMS) it mentions 3 more: CONSTANT_MethodHandle CONSTANT_MethodType CONSTANT_InvokeDynamic The 11 mentioned on the Wikipedia page seem fairly self-explanatory, and I understand their purpose and use. However, I'm confused by the 3 extra described in the JVMS.

问题 I am writing a plugin of another large java program . I want to modify some byte code of some java method of the java program during runtime, so that I can intercept the method calls (namely, inject some hooking code into the method). Any way can achieve this? PS: I've checked the following approaches: 1.change the classloader of the java program. (we CANNOT change it) 2.use java proxy. (We CANNOT use java proxy, because java proxy would create a new proxy object. We DON'T use the proxy

问题 I have a String that I need to convert to java class, compile and create an instance at run time: Suppose my String is: String s = " public class Test { public Double add(Double x, Double y){ return (x+y); } }" How can I convert it to a class Test .class, instantiate it and call the method add(Double x, Double y) at run time? I read about Byte Buddy , but the examples I see has a class already defined. In a situation like the above, could anyone give an example how can I use ByteBuddy or any

问题 I've this java source file: import java.util.function.*; public class t { public static void main(String[] args) { Function<Integer,Integer> r = (a) -> a*a+2*a+1; System.out.println(r.apply(2)); } } I compile it and it works as expected. Here's the output of javap -c -v t , and I can't find the location of lambda in it. Where's the bytecode which tells the jvm to compute the expression with the input Integer whenever the lambda is envoked? 回答1: If you want to see the code of your lambda body