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155 lines
7.1 KiB
HTML
155 lines
7.1 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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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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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Rust (Debugging with GDB)</title>
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<meta name="description" content="Rust (Debugging with GDB)">
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<meta name="keywords" content="Rust (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Supported-Languages.html#Supported-Languages" rel="up" title="Supported Languages">
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<link href="Modula_002d2.html#Modula_002d2" rel="next" title="Modula-2">
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<link href="Pascal.html#Pascal" rel="prev" title="Pascal">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Rust"></a>
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<div class="header">
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<p>
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Next: <a href="Modula_002d2.html#Modula_002d2" accesskey="n" rel="next">Modula-2</a>, Previous: <a href="Pascal.html#Pascal" accesskey="p" rel="prev">Pascal</a>, Up: <a href="Supported-Languages.html#Supported-Languages" accesskey="u" rel="up">Supported Languages</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>
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</div>
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<hr>
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<a name="Rust-1"></a>
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<h4 class="subsection">15.4.8 Rust</h4>
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<p><small>GDB</small> supports the <a href="https://www.rust-lang.org/">Rust
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Programming Language</a>. Type- and value-printing, and expression
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parsing, are reasonably complete. However, there are a few
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peculiarities and holes to be aware of.
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</p>
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<ul>
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<li> Linespecs (see <a href="Specify-Location.html#Specify-Location">Specify Location</a>) are never relative to the current
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crate. Instead, they act as if there were a global namespace of
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crates, somewhat similar to the way <code>extern crate</code> behaves.
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<p>That is, if <small>GDB</small> is stopped at a breakpoint in a function in
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crate ‘<samp>A</samp>’, module ‘<samp>B</samp>’, then <code>break B::f</code> will attempt
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to set a breakpoint in a function named ‘<samp>f</samp>’ in a crate named
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‘<samp>B</samp>’.
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</p>
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<p>As a consequence of this approach, linespecs also cannot refer to
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items using ‘<samp>self::</samp>’ or ‘<samp>super::</samp>’.
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</p>
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</li><li> Because <small>GDB</small> implements Rust name-lookup semantics in
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expressions, it will sometimes prepend the current crate to a name.
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For example, if <small>GDB</small> is stopped at a breakpoint in the crate
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‘<samp>K</samp>’, then <code>print ::x::y</code> will try to find the symbol
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‘<samp>K::x::y</samp>’.
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<p>However, since it is useful to be able to refer to other crates when
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debugging, <small>GDB</small> provides the <code>extern</code> extension to
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circumvent this. To use the extension, just put <code>extern</code> before
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a path expression to refer to the otherwise unavailable “global”
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scope.
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</p>
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<p>In the above example, if you wanted to refer to the symbol ‘<samp>y</samp>’ in
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the crate ‘<samp>x</samp>’, you would use <code>print extern x::y</code>.
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</p>
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</li><li> The Rust expression evaluator does not support “statement-like”
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expressions such as <code>if</code> or <code>match</code>, or lambda expressions.
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</li><li> Tuple expressions are not implemented.
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</li><li> The Rust expression evaluator does not currently implement the
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<code>Drop</code> trait. Objects that may be created by the evaluator will
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never be destroyed.
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</li><li> <small>GDB</small> does not implement type inference for generics. In order
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to call generic functions or otherwise refer to generic items, you
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will have to specify the type parameters manually.
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</li><li> <small>GDB</small> currently uses the C<tt>++</tt> demangler for Rust. In most
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cases this does not cause any problems. However, in an expression
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context, completing a generic function name will give syntactically
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invalid results. This happens because Rust requires the ‘<samp>::</samp>’
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operator between the function name and its generic arguments. For
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example, <small>GDB</small> might provide a completion like
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<code>crate::f<u32></code>, where the parser would require
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<code>crate::f::<u32></code>.
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</li><li> As of this writing, the Rust compiler (version 1.8) has a few holes in
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the debugging information it generates. These holes prevent certain
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features from being implemented by <small>GDB</small>:
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<ul>
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<li> Method calls cannot be made via traits.
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</li><li> Operator overloading is not implemented.
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</li><li> When debugging in a monomorphized function, you cannot use the generic
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type names.
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</li><li> The type <code>Self</code> is not available.
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</li><li> <code>use</code> statements are not available, so some names may not be
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available in the crate.
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</li></ul>
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</li></ul>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Modula_002d2.html#Modula_002d2" accesskey="n" rel="next">Modula-2</a>, Previous: <a href="Pascal.html#Pascal" accesskey="p" rel="prev">Pascal</a>, Up: <a href="Supported-Languages.html#Supported-Languages" accesskey="u" rel="up">Supported Languages</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>
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</div>
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</body>
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</html>
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