bytecode Questions
9
Solved
I'm little confused. Does the JVM generate the bytecode? Or does it just load the compiled .class files (bytecode) into memory? Or is the JVM just specifications to run the bytecode in a platform-i...
5
Solved
When I get an NPE, I'll get a stack trace with line number.
That's helpful, but if the line is very dense and/or contains nested expression, it's still impossible to figure out which reference was ...
Frag asked 14/10, 2016 at 18:39
4
Solved
I am trying to instrument java byte code.
I want to recognize the entry and exit of a java loop, but I have found the identification of loops to be quite challenging.
I have spent a good few hours...
Tips asked 22/7, 2011 at 15:28
1
Solved
I have the following basic python function:
def squared(num):
if num < 2:
print ('OK!')
return num * num
Which produces the following bytecode:
>>> dis.dis(squared)
2 0 LOAD_FAS...
4
Solved
I've been thinking about checking jar file's hash value to determine if it has changed or not, but as it turns out the same jar file has different hashes every time I build it (export as jar file f...
4
What does it mean for a Java program to be JIT'ed and does it make the execution a lot more faster? Or are there bytecodes which are not JIT'ed?
Forebrain asked 16/12, 2015 at 15:31
0
This bytecode comes from exec marshal.loads('<BYTECODE>') and I want to transform it into regular python script with legible source code.
I can't paste all the bytecode because it weighs abou...
Heed asked 5/9, 2019 at 9:6
1
Solved
CPython 3.7 introduced the ability to step through individual opcodes in a debugger. However, I can't figure out how to read variables out of the bytecode stack.
For example, when debugging
def f...
2
Solved
What follows is four functions that have the same output, but either written with a list comprehension or a tight loop, and a function call to vs an inline condition.
Interestingly, a and b have t...
Wellordered asked 25/8, 2019 at 16:12
5
Solved
I have a snippet of simple Java code:
public static void main(String[] args) {
String testStr = "test";
String rst = testStr + 1 + "a" + "pig" + 2;
System.out.println(rst);
}
Compile it with ...
2
Solved
I am studying the workings of Inner Class and inside its bytecode, I was tracing the stack and couldn't understand why is the getClass() called?
I found a similar question for Lambda function but c...
Ampulla asked 4/7, 2019 at 6:24
2
Solved
I've been using the dis module to observe CPython bytecode. But lately, I've noticed some inconvenient behavior of dis.dis().
Take this example for instance: I first define a function multiplier w...
Shuck asked 3/7, 2017 at 4:18
2
Solved
In our log files we find the following:
[2012-09-24 00:09:32.590 +0000UTC] ERROR host server1 [] [] somepackage.someclass [] [Unknown] [V3rAqPaDvvAAAAExEXhdWGyh] [pjsQwTGHzxcAAAE5j4YdGvWV] "Thread...
Polard asked 25/9, 2012 at 11:50
0
Is there anyway to get source code back from a .pyt file? when I try to open all i get is a bunch of symbols. I had an .exe file then converted files to .pyc but the main source code seems to be in...
Hades asked 28/5, 2019 at 15:10
1
I am working with a fairly old Java Ant project, which I have imported into IntelliJ, it previously having been developed using Eclipse. The project consists of a small number of servlets. I am try...
Kelleykelli asked 20/4, 2018 at 4:58
1
Solved
Is there a limit to the size of a Python module?
It seems to me that the Python bytecode instruction POP_JUMP_IF_FALSE takes a 1-byte operand, telling it the instruction index to jump to.
Quoting...
Pu asked 20/4, 2019 at 19:1
3
Solved
What could help me in helping writing highly compact(least byte code count) programs in Java.
Possibly I'm looking at:
A tool that tells me how many byte
codes a Class or a method generates.
To ...
Nell asked 8/9, 2009 at 0:40
3
Solved
As Oracle sues Google over the Dalvik VM it becomes clear, that you cannot implement a Java VM without license from Oracle (EDIT: Matthew Flaschen points out, that the claims of Oracle may not be v...
Dunk asked 30/8, 2010 at 13:29
1
Is it possible to generate gremlin script from the bytecode?
I am working on a POC in which I need to query graph Azure CosmosDB database via Gremlin API.
Currently, Azure CosmosDB does not suppo...
Loma asked 20/3, 2019 at 20:6
1
Solved
Given a code object compiled from the following 3 lines of code:
code = compile('''a = 1 / 0 # bad stuff. avoid running this!
b = 'good stuff'
c = True''', '', 'exec')
which calling dis.dis(code...
Gelatinoid asked 16/3, 2019 at 2:51
2
Solved
I've modified the line 15 of the bytecode below and changed it form invokevirtual to invokespecial (JAVA 8). Unfortunately I get a verify error ( Bad type on operand stack)
I know that the value o...
Ellary asked 11/3, 2019 at 13:59
3
Solved
I would like to observe the Ruby bytecode executed by YARV, post mortem.
How can I get this ?
Someone else here told it was not possible. However, there is the hotruby framework that seems to exe...
Radioscopy asked 1/8, 2011 at 9:4
10
Solved
The following Java program takes on average between 0.50 secs and 0.55 secs to run:
public static void main(String[] args) {
long startTime = System.nanoTime();
int n = 0;
for (int i = 0; i <...
Guadalcanal asked 23/11, 2018 at 20:40
3
Solved
I was reading java bytecode and saw this:
getfield #5 (Field java.lang.String name)
What does #5 mean?
And how can I write a program in bytecode?
3
Solved
There are three opcodes to invoke Java methods. It is clear that invokeStatic is just for static method invocation.
As far as I know invokespecial is used when invoking constructor and private met...
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