Posted by: admin February 23, Leave a comment. It works also fine. I have done this in my game base project — you can see the JNI code which handles this here:. The overall solution is based on handling signals, then in the signal handler firing a call up to java to dump the stack trace etc, in my code I start another activity to get the logcat information and email it to me.
ACRA can trap the application crashing. You could then instantiate a second process that would execute the logcat see this question command, filtering by your application name, and then have the process to send the dumped file to you. This is far from optimal because:. February 26, Android Leave a comment.
Questions: In my layout, I am using falling for predefined values for android:textAppearence. But, there are, as I found, at least 2 ways to define them, which yields a very different result like, di Questions: I have following custom font family code, and i want to have font weight for that font abc.
How can solve it? Add menu. Native code — how to get function call stack backtrace programmatically Posted by: admin February 23, Leave a comment. How to define textAppearence value in android layout-Exceptionshub February 26, Android Leave a comment Questions: In my layout, I am using falling for predefined values for android:textAppearence.In desperation, you resort to posting the error up on the internet.
Here we see a series of functions that call each other. The last function will error, causing the program to halt and emit a stack trace. And you can see from the above error, query was called by database, which in turn was called by controller.
You can see then that the stack trace shows which functions called each other. Importantly, we can also see the line number and file that the function exists on, and the topmost line is the error itself. The stack trace helps us to know the steps that lead up to our error. But wait—before you take your newfound knowledge of stack traces and start using the console.
This will make our whole debugging process so much more painful. As you can see, the error is thrown, but the parent function that led to the error is anonymous. Not only that, but the error itself is quite cryptic. It tells us that an error happened, but no indication is made as to why the error occurred. The stack trace contains a reference to an unnamed function because in the previous example the error that was thrown was in fact anonymous. Go ahead and take a look.
So how can we resolve the problem and go back to understanding the history of each of our called functions?
By ensuring that we apply a name property to all of our functions. You can name a function by adding the name between the function keyword and your argument brackets. Always name your functions. The keen-eyed among you will have noticed that in all the examples shown so far, the error messages themselves have been pretty useless.
In order for stack traces to be their most effective, we should anticipate as many error states as possible and throw descriptive errors. Seem familiar?The console interface's trace method outputs a stack trace to the Web Console. See Stack traces in the console documentation for details and examples. Get the latest and greatest from MDN delivered straight to your inbox.
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The newsletter is offered in English only at the moment. Sign up now. Sign in with Github Sign in with Google. Console API The definition of 'console. Chrome Full support 1.
Native code – how to get function call stack (backtrace) programmatically
Edge Full support Firefox Full support IE Full support Opera Full support Safari Full support 4. WebView Android Full support 1. Chrome Android Full support You start working on a new project right after you finish reading this post. After or-so minutes of getting the project base ready so that you can begin the real projectyou get hit with an error.
Before diving into other avenues of fixing the issue, take a step back, clear your mind, get a drink of water, and then consider these points:. Finding root causes are most of the battle. That being said, try to have an open mind to try new tactics. In some cases, no trace shows. Why is that? To try to find the source of the problem, you could log information to the console before and after where you think the issue is.
Think of a stack trace like a stack of dishes. When they are piling up and they start to fall over, you know that last couple plates are the culprit. In the same way, the most recent actions which is likely where the problem resides are at the top of the stack trace. If the issue involves a package, the author may have put a good message or hint to help out. Even the language-level exceptions usually have hints. This would be the perfect place to start. Not only do you get to see the file name, but the trace includes the line number and sometimes the column number.
The column tends to not be as useful, but hey - thanks to whoever decided to put those in there! Sometimes the name of an exception thrown can give you a solid clue. Use some insight gleaned from the next section to search based on these. If you run into this issue often, consider memorizing some of the more common exceptions for your language or framework.
Some traces are very long. So where does it shift from helpful to a waste of time? My experience has been that you can find the clues you need in the first 5 items of the trace. You can run this client-side or server-side:. Right click all of the search results that look promising to open them up in a new tab. Be sure to understand what the code is actually doing before you accept it into your final product.
Is it worth starting over? This may also make it more likely that your issues are common across other users of the framework. An honest question is not a sign of weakness - in fact, it can increase team harmony.
I chose to work off a Collection for simplicity, and because I didn't mind the performance penalty of using a For loop to iterate its items in reverse.
I did consider using an array instead, but it seemed the boundary handling and constant resizing left a sour taste to the code: I deliberately preferred the readability and simplicity of a Collection over the For -loop performance of an array. Because I wanted a "stack frame" to be essentially immutable, I only exposed it via a read-only IStackFrame interface:. The user code API takes a ParamArray parameter instead, so that the parameter values can simply be enumerated without any other required code; this allows CallStack.
Push to be the first executable line of code in every procedure of the user's code. Of course, manually managing the stack trace means it's the user code's responsibility to ensure every method pushes itself into the stack, and pops itself out at every exit point: bad error handling, or careless refactorings, and the custom call stack starts telling lies - it's somewhat inherently brittle, but the ability to log errors with a detailed stack trace seems to outweight the additional maintenance cost.
Any room for improvement? Any oversight? Maybe I miss something, but can you tell me how to get this use case running with your solution? Imagine the following procedure call stack, all of them use your CallStack. Push and Pop methods but only Sub1 and Sub3 have an error handler:.
Now in Sub5 there will raise an error. How can we pop Sub4 and Sub5 from the call stack before going on without losing the call stack of Sub1 to Sub3?
After googling about XHR, I tried some code with node. Screenshot web inspector 1. Screenshot web inspector 2.
In node.The Call Stack
Here's a simple example:. Learn more. Asked yesterday. Active yesterday. Viewed 24 times.
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After console. If you place a debugger; line in your code, Chrome will automatically stop there when executing. You can even wrap it in conditionals, so it only runs when you need it. Sometimes, you have a complex set of objects that you want to view.
You can either console. How about resizing your viewport instead? Chrome provides you with everything you need. Watch your media queries come to life! Mark a DOM element in the elements panel and use it in your console. It can be super useful to know exactly how long something has taken to execute, especially when debugging slow loops. You can even set up multiple timers by assigning a label to the method.
This is when console. Imagine you want to see the entire stack trace for the function call funcZ in the car instance on line Even though you think you know your script well this can still be quite handy.
Find the line in your inspector and add a breakpoint 2. Add a debugger in your script. In both of these solutions, you have to navigate manually around in your files to isolate the particular line you want to debug.
Use debug funcName in the console and the script will stop when it reaches the function you passed in.