162 lines
7.7 KiB
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162 lines
7.7 KiB
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<html lang="en">
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<title>Guile Exception Handling - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link rel="up" href="Guile-API.html#Guile-API" title="Guile API">
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<link rel="prev" href="GDB-Scheme-Data-Types.html#GDB-Scheme-Data-Types" title="GDB Scheme Data Types">
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<link rel="next" href="Values-From-Inferior-In-Guile.html#Values-From-Inferior-In-Guile" title="Values From Inferior In Guile">
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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<body>
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<div class="node">
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<a name="Guile-Exception-Handling"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Values-From-Inferior-In-Guile.html#Values-From-Inferior-In-Guile">Values From Inferior In Guile</a>,
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Previous: <a rel="previous" accesskey="p" href="GDB-Scheme-Data-Types.html#GDB-Scheme-Data-Types">GDB Scheme Data Types</a>,
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Up: <a rel="up" accesskey="u" href="Guile-API.html#Guile-API">Guile API</a>
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<hr>
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</div>
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<h5 class="subsubsection">23.3.3.4 Guile Exception Handling</h5>
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<p><a name="index-guile-exceptions-2473"></a><a name="index-exceptions_002c-guile-2474"></a><a name="index-set-guile-print_002dstack-2475"></a>
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When executing the <code>guile</code> command, Guile exceptions
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uncaught within the Guile code are translated to calls to the
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<span class="sc">gdb</span> error-reporting mechanism. If the command that called
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<code>guile</code> does not handle the error, <span class="sc">gdb</span> will
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terminate it and report the error according to the setting of
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the <code>guile print-stack</code> parameter.
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<p>The <code>guile print-stack</code> parameter has three settings:
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<dl>
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<dt><code>none</code><dd>Nothing is printed.
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<br><dt><code>message</code><dd>An error message is printed containing the Guile exception name,
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the associated value, and the Guile call stack backtrace at the
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point where the exception was raised. Example:
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<pre class="smallexample"> (gdb) guile (display foo)
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ERROR: In procedure memoize-variable-access!:
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ERROR: Unbound variable: foo
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Error while executing Scheme code.
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</pre>
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<br><dt><code>full</code><dd>In addition to an error message a full backtrace is printed.
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<pre class="smallexample"> (gdb) set guile print-stack full
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(gdb) guile (display foo)
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Guile Backtrace:
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In ice-9/boot-9.scm:
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157: 10 [catch #t #<catch-closure 2c76e20> ...]
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In unknown file:
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?: 9 [apply-smob/1 #<catch-closure 2c76e20>]
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In ice-9/boot-9.scm:
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157: 8 [catch #t #<catch-closure 2c76d20> ...]
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In unknown file:
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?: 7 [apply-smob/1 #<catch-closure 2c76d20>]
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?: 6 [call-with-input-string "(display foo)" ...]
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In ice-9/boot-9.scm:
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2320: 5 [save-module-excursion #<procedure 2c2dc30 ... ()>]
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In ice-9/eval-string.scm:
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44: 4 [read-and-eval #<input: string 27cb410> #:lang ...]
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37: 3 [lp (display foo)]
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In ice-9/eval.scm:
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387: 2 [eval # ()]
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393: 1 [eval #<memoized foo> ()]
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In unknown file:
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?: 0 [memoize-variable-access! #<memoized foo> ...]
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ERROR: In procedure memoize-variable-access!:
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ERROR: Unbound variable: foo
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Error while executing Scheme code.
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</pre>
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</dl>
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<p><span class="sc">gdb</span> errors that happen in <span class="sc">gdb</span> commands invoked by
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Guile code are converted to Guile exceptions. The type of the
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Guile exception depends on the error.
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<p>Guile procedures provided by <span class="sc">gdb</span> can throw the standard
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Guile exceptions like <code>wrong-type-arg</code> and <code>out-of-range</code>.
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<p>User interrupt (via <kbd>C-c</kbd> or by typing <kbd>q</kbd> at a pagination
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prompt) is translated to a Guile <code>signal</code> exception with value
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<code>SIGINT</code>.
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<p><span class="sc">gdb</span> Guile procedures can also throw these exceptions:
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<dl>
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<dt><code>gdb:error</code><a name="index-gdb_003aerror-2476"></a><dd>This exception is a catch-all for errors generated from within <span class="sc">gdb</span>.
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<br><dt><code>gdb:invalid-object</code><a name="index-gdb_003ainvalid_002dobject-2477"></a><dd>This exception is thrown when accessing Guile objects that wrap underlying
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<span class="sc">gdb</span> objects have become invalid. For example, a
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<code><gdb:breakpoint></code> object becomes invalid if the user deletes it
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from the command line. The object still exists in Guile, but the
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object it represents is gone. Further operations on this breakpoint
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will throw this exception.
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<br><dt><code>gdb:memory-error</code><a name="index-gdb_003amemory_002derror-2478"></a><dd>This exception is thrown when an operation tried to access invalid
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memory in the inferior.
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<br><dt><code>gdb:pp-type-error</code><a name="index-gdb_003app_002dtype_002derror-2479"></a><dd>This exception is thrown when a Guile pretty-printer passes a bad object
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to <span class="sc">gdb</span>.
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</dl>
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<p>The following exception-related procedures are provided by the
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<code>(gdb)</code> module.
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<div class="defun">
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— Scheme Procedure: <b>make-exception</b><var> key args<a name="index-make_002dexception-2480"></a></var><br>
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<blockquote><p>Return a <code><gdb:exception></code> object given by its <var>key</var> and
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<var>args</var>, which are the standard Guile parameters of an exception.
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See the Guile documentation for more information (see <a href="../guile/Exceptions.html#Exceptions">Exceptions</a>).
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</p></blockquote></div>
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<div class="defun">
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— Scheme Procedure: <b>exception?</b><var> object<a name="index-exception_003f-2481"></a></var><br>
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<blockquote><p>Return <code>#t</code> if <var>object</var> is a <code><gdb:exception></code> object.
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Otherwise return <code>#f</code>.
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</p></blockquote></div>
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<div class="defun">
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— Scheme Procedure: <b>exception-key</b><var> exception<a name="index-exception_002dkey-2482"></a></var><br>
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<blockquote><p>Return the <var>args</var> field of a <code><gdb:exception></code> object.
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</p></blockquote></div>
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<div class="defun">
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— Scheme Procedure: <b>exception-args</b><var> exception<a name="index-exception_002dargs-2483"></a></var><br>
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<blockquote><p>Return the <var>args</var> field of a <code><gdb:exception></code> object.
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</p></blockquote></div>
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</body></html>
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