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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | 6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch) | |
| tree | 1c2a6a60531acf791531bbd9c8ac14c23ef8a66c /share/doc/gdb/Exception-Handling.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/Exception-Handling.html b/share/doc/gdb/Exception-Handling.html new file mode 100644 index 0000000..33630a9 --- /dev/null +++ b/share/doc/gdb/Exception-Handling.html @@ -0,0 +1,171 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Free Software" and "Free Software Needs +Free Documentation", with the Front-Cover Texts being "A GNU Manual," +and with the Back-Cover Texts as in (a) below. + +(a) The FSF's Back-Cover Text is: "You are free to copy and modify +this GNU Manual. Buying copies from GNU Press supports the FSF in +developing GNU and promoting software freedom." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Exception Handling</title> + +<meta name="description" content="Debugging with GDB: Exception Handling"> +<meta name="keywords" content="Debugging with GDB: Exception Handling"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Python-API.html#Python-API" rel="up" title="Python API"> +<link href="Values-From-Inferior.html#Values-From-Inferior" rel="next" title="Values From Inferior"> +<link href="Basic-Python.html#Basic-Python" rel="previous" title="Basic Python"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Exception-Handling"></a> +<div class="header"> +<p> +Next: <a href="Values-From-Inferior.html#Values-From-Inferior" accesskey="n" rel="next">Values From Inferior</a>, Previous: <a href="Basic-Python.html#Basic-Python" accesskey="p" rel="previous">Basic Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Exception-Handling-1"></a> +<h4 class="subsubsection">23.3.2.2 Exception Handling</h4> +<a name="index-python-exceptions"></a> +<a name="index-exceptions_002c-python"></a> + +<p>When executing the <code>python</code> command, Python exceptions +uncaught within the Python code are translated to calls to +<small>GDB</small> error-reporting mechanism. If the command that called +<code>python</code> does not handle the error, <small>GDB</small> will +terminate it and print an error message containing the Python +exception name, the associated value, and the Python call stack +backtrace at the point where the exception was raised. Example: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) python print foo +Traceback (most recent call last): + File "<string>", line 1, in <module> +NameError: name 'foo' is not defined +</pre></div> + +<p><small>GDB</small> errors that happen in <small>GDB</small> commands invoked by +Python code are converted to Python exceptions. The type of the +Python exception depends on the error. +</p> +<dl compact="compact"> +<dt><code>gdb.error</code> +<a name="index-gdb_002eerror"></a> +</dt> +<dd><p>This is the base class for most exceptions generated by <small>GDB</small>. +It is derived from <code>RuntimeError</code>, for compatibility with earlier +versions of <small>GDB</small>. +</p> +<p>If an error occurring in <small>GDB</small> does not fit into some more +specific category, then the generated exception will have this type. +</p> +</dd> +<dt><code>gdb.MemoryError</code> +<a name="index-gdb_002eMemoryError"></a> +</dt> +<dd><p>This is a subclass of <code>gdb.error</code> which is thrown when an +operation tried to access invalid memory in the inferior. +</p> +</dd> +<dt><code>KeyboardInterrupt</code> +<a name="index-KeyboardInterrupt"></a> +</dt> +<dd><p>User interrupt (via <kbd>C-c</kbd> or by typing <kbd>q</kbd> at a pagination +prompt) is translated to a Python <code>KeyboardInterrupt</code> exception. +</p></dd> +</dl> + +<p>In all cases, your exception handler will see the <small>GDB</small> error +message as its value and the Python call stack backtrace at the Python +statement closest to where the <small>GDB</small> error occured as the +traceback. +</p> + +<p>When implementing <small>GDB</small> commands in Python via +<code>gdb.Command</code>, or functions via <code>gdb.Function</code>, it is useful +to be able to throw an exception that doesn’t cause a traceback to be +printed. For example, the user may have invoked the command +incorrectly. <small>GDB</small> provides a special exception class that can +be used for this purpose. +</p> +<dl compact="compact"> +<dt><code>gdb.GdbError</code> +<a name="index-gdb_002eGdbError"></a> +</dt> +<dd><p>When thrown from a command or function, this exception will cause the +command or function to fail, but the Python stack will not be +displayed. <small>GDB</small> does not throw this exception itself, but +rather recognizes it when thrown from user Python code. Example: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) python +>class HelloWorld (gdb.Command): +> """Greet the whole world.""" +> def __init__ (self): +> super (HelloWorld, self).__init__ ("hello-world", gdb.COMMAND_USER) +> def invoke (self, args, from_tty): +> argv = gdb.string_to_argv (args) +> if len (argv) != 0: +> raise gdb.GdbError ("hello-world takes no arguments") +> print ("Hello, World!") +>HelloWorld () +>end +(gdb) hello-world 42 +hello-world takes no arguments +</pre></div> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Values-From-Inferior.html#Values-From-Inferior" accesskey="n" rel="next">Values From Inferior</a>, Previous: <a href="Basic-Python.html#Basic-Python" accesskey="p" rel="previous">Basic Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |