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- Stack trace - Wikipedia
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- std::basic_stacktrace - cppreference.com
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In computing, a stack trace (also called stack backtrace or stack traceback) is a report of the active stack frames at a certain point in time during the execution of a program. When a program is run, memory is often dynamically allocated in two places: the stack and the heap. Memory is continuously allocated on a stack but not on a heap. Stack also refers to a programming construct, thus to differentiate it, this stack is referred to as the program's function call stack. Technically, once a block of memory has been allocated on the stack, it cannot be easily removed as there can be other blocks of memory that were allocated after it. Each time a function is called in a program, a block of memory called an activation record is allocated on top of the call stack. Generally, the activation record stores the function's arguments and local variables. What exactly it contains and how it's laid out is determined by the calling convention.
Programmers commonly use stack tracing during interactive and post-mortem debugging. End-users may see a stack trace displayed as part of an error message, which the user can then report to a programmer.
A stack trace allows tracking the sequence of nested functions called - up to the point where the stack trace is generated. In a post-mortem scenario this extends up to the function where the failure occurred (but was not necessarily caused). Sibling calls do not appear in a stack trace.
Language support
Many programming languages, including Java and C#, have built-in support for retrieving the current stack trace via system calls. Before std::stacktrace was added in standard library as a container for std::stacktrace_entry, pre-C++23 has no built-in support for doing this, but C++ users can retrieve stack traces with (for example) the stacktrace library. In JavaScript, exceptions hold a stack property that contain the stack from the place where it was thrown.
= Python
=As an example, the following Python program contains an error.
Running the program under the standard Python interpreter produces the following error message.
The stack trace shows where the error occurs, namely in the c function. It also shows that the c function was called by b, which was called by a, which was in turn called by the code on line 15 (the last line) of the program. The activation records for each of these three functions would be arranged in a stack such that the a function would occupy the bottom of the stack and the c function would occupy the top of the stack.
= Java
=In Java, stack traces can be dumped manually with Thread.dumpStack() Take the following input:
The exception lists functions in descending order, so the most-inner call is first.
= C and C++
=Both C and C++ (pre-C++23) do not have native support for obtaining stack traces, but libraries such as glibc and boost provide this functionality. In these languages, some compiler optimizations may interfere with the call stack information that can be recovered at runtime. For instance, inlining can cause missing stack frames, tail call optimizations can replace one stack frame with another, and frame pointer elimination can prevent call stack analysis tools from correctly interpreting the contents of the call stack.
For example, glibc's backtrace() function returns an output with the program function and memory address.
As of C++23, stack traces can be dumped manually by printing the value returned by static member function std::stacktrace::current():
= Rust
=Rust has two types of errors. Functions that use the panic macro are "unrecoverable" and the current thread will become poisoned experiencing stack unwinding. Functions that return a std::result::Result are "recoverable" and can be handled gracefully. However, recoverable errors cannot generate a stack trace as they are manually added and not a result of a runtime error.
As of June 2021, Rust has experimental support for stack traces on unrecoverable errors. Rust supports printing to stderr when a thread panics, but it must be enabled by setting the RUST_BACKTRACE environment variable.
When enabled, such backtraces look similar to below, with the most recent call first.
See also
Tail call
Context (computing)
Stack overflow
Exception handling
Call stack
References
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java - What is a stack trace, and how can I use it to debug my ...
In simple terms, a stack trace is a list of the method calls that the application was in the middle of when an Exception was thrown. Simple Example. With the example given in the question, we can determine exactly where the exception was thrown in the application. Let's have a …
Stack trace - Wikipedia
In computing, a stack trace (also called stack backtrace [1] or stack traceback [2]) is a report of the active stack frames at a certain point in time during the execution of a program. When a program is run, memory is often dynamically allocated in two places: the stack and the heap .
Stack Trace: How to Debug Your Application With a Stack Trace
Mar 24, 2021 · What Is a Stack Trace? To put it simply, a stack trace represents a call stack at a certain point in time. To better understand what a call stack is, let’s dive a bit deeper into how programming languages work.
std::basic_stacktrace - cppreference.com
Jan 1, 2024 · A stacktrace is an approximate representation of an invocation sequence and consists of stacktrace entries. A stacktrace entry represents an evaluation in a stacktrace. It is represented by std::stacktrace_entry in the C++ standard library. An allocator that is used to acquire/release memory and to construct/destroy the elements in that memory.
Java Stack Trace: How to Read and Understand to Debug Code
May 23, 2019 · A stack trace shows the call stack (sets of active stack frames) and provides information on the methods that your code called. Usually, a stack trace is shown when an Exception is not handled correctly in code.
Stack Trace - OSDev Wiki
Jul 9, 2023 · A stack trace is debugging output, normally sent to a log file or a debug window that shows the hierarchy of callers that called the current function. A stack trace is generated by analysing the stack to find each stack frame.
Python Traceback Stack Trace Analysis Guide - PyTutorial
Dec 30, 2024 · Learn how to use Python traceback.extract_stack() for stack trace analysis, debugging, and error handling with practical examples and best practices.
What is a Java Stack Trace? How to Read & Analyze Traces
May 30, 2022 · The stack trace, also called a backtrace, consists of a collection of stack records, which store an application's movement during its execution. The stack trace includes information about program subroutines and can be used to debug or troubleshoot and is …
Understanding and Using a Java Stack Trace for Debugging
Aug 16, 2024 · What is a Stack Trace? A stack trace is a snapshot of the call stack at the point where an exception occurs. It shows: Exception type and message: The exception type...
Understanding Stack Traces - CodingDrills
Learn how to interpret stack traces and use them to identify and fix issues in your code. In this technical tutorial, we will delve into the world of debugging and troubleshooting by focusing on understanding stack traces.