diff options
Diffstat (limited to 'share/doc/gdb/Lazy-Strings-In-Guile.html')
| -rw-r--r-- | share/doc/gdb/Lazy-Strings-In-Guile.html | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/share/doc/gdb/Lazy-Strings-In-Guile.html b/share/doc/gdb/Lazy-Strings-In-Guile.html new file mode 100644 index 0000000..e83e0a6 --- /dev/null +++ b/share/doc/gdb/Lazy-Strings-In-Guile.html @@ -0,0 +1,143 @@ +<!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: Lazy Strings In Guile</title> + +<meta name="description" content="Debugging with GDB: Lazy Strings In Guile"> +<meta name="keywords" content="Debugging with GDB: Lazy Strings In Guile"> +<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="Guile-API.html#Guile-API" rel="up" title="Guile API"> +<link href="Architectures-In-Guile.html#Architectures-In-Guile" rel="next" title="Architectures In Guile"> +<link href="Breakpoints-In-Guile.html#Breakpoints-In-Guile" rel="previous" title="Breakpoints In Guile"> +<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="Lazy-Strings-In-Guile"></a> +<div class="header"> +<p> +Next: <a href="Architectures-In-Guile.html#Architectures-In-Guile" accesskey="n" rel="next">Architectures In Guile</a>, Previous: <a href="Breakpoints-In-Guile.html#Breakpoints-In-Guile" accesskey="p" rel="previous">Breakpoints In Guile</a>, Up: <a href="Guile-API.html#Guile-API" accesskey="u" rel="up">Guile 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="Guile-representation-of-lazy-strings_002e"></a> +<h4 class="subsubsection">23.4.3.20 Guile representation of lazy strings.</h4> + +<a name="index-lazy-strings-in-guile"></a> +<a name="index-_003cgdb_003alazy_002dstring_003e"></a> + +<p>A <em>lazy string</em> is a string whose contents is not retrieved or +encoded until it is needed. +</p> +<p>A <code><gdb:lazy-string></code> is represented in <small>GDB</small> as an +<code>address</code> that points to a region of memory, an <code>encoding</code> +that will be used to encode that region of memory, and a <code>length</code> +to delimit the region of memory that represents the string. The +difference between a <code><gdb:lazy-string></code> and a string wrapped within +a <code><gdb:value></code> is that a <code><gdb:lazy-string></code> will be treated +differently by <small>GDB</small> when printing. A <code><gdb:lazy-string></code> is +retrieved and encoded during printing, while a <code><gdb:value></code> +wrapping a string is immediately retrieved and encoded on creation. +</p> +<p>The following lazy-string-related procedures are provided by the +<code>(gdb)</code> module: +</p> +<dl> +<dt><a name="index-lazy_002dstring_003f"></a>Scheme Procedure: <strong>lazy-string?</strong> <em>object</em></dt> +<dd><p>Return <code>#t</code> if <var>object</var> is an object of type <code><gdb:lazy-string></code>. +Otherwise return <code>#f</code>. +</p></dd></dl> + +<dl> +<dt><a name="index-lazy_002dstring_002daddress"></a>Scheme Procedure: <strong>lazy-string-address</strong> <em>lazy-sring</em></dt> +<dd><p>Return the address of <var>lazy-string</var>. +</p></dd></dl> + +<dl> +<dt><a name="index-lazy_002dstring_002dlength"></a>Scheme Procedure: <strong>lazy-string-length</strong> <em>lazy-string</em></dt> +<dd><p>Return the length of <var>lazy-string</var> in characters. If the +length is -1, then the string will be fetched and encoded up to the +first null of appropriate width. +</p></dd></dl> + +<dl> +<dt><a name="index-lazy_002dstring_002dencoding"></a>Scheme Procedure: <strong>lazy-string-encoding</strong> <em>lazy-string</em></dt> +<dd><p>Return the encoding that will be applied to <var>lazy-string</var> +when the string is printed by <small>GDB</small>. If the encoding is not +set, or contains an empty string, then <small>GDB</small> will select the +most appropriate encoding when the string is printed. +</p></dd></dl> + +<dl> +<dt><a name="index-lazy_002dstring_002dtype"></a>Scheme Procedure: <strong>lazy-string-type</strong> <em>lazy-string</em></dt> +<dd><p>Return the type that is represented by <var>lazy-string</var>’s type. +For a lazy string this is a pointer or array type. To +resolve this to the lazy string’s character type, use <code>type-target-type</code>. +See <a href="Types-In-Guile.html#Types-In-Guile">Types In Guile</a>. +</p></dd></dl> + +<dl> +<dt><a name="index-lazy_002dstring_002d_003evalue"></a>Scheme Procedure: <strong>lazy-string->value</strong> <em>lazy-string</em></dt> +<dd><p>Convert the <code><gdb:lazy-string></code> to a <code><gdb:value></code>. This value +will point to the string in memory, but will lose all the delayed +retrieval, encoding and handling that <small>GDB</small> applies to a +<code><gdb:lazy-string></code>. +</p></dd></dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Architectures-In-Guile.html#Architectures-In-Guile" accesskey="n" rel="next">Architectures In Guile</a>, Previous: <a href="Breakpoints-In-Guile.html#Breakpoints-In-Guile" accesskey="p" rel="previous">Breakpoints In Guile</a>, Up: <a href="Guile-API.html#Guile-API" accesskey="u" rel="up">Guile 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> |