| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1988-2015 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 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Debugging with GDB: Lazy Strings In Python</title> |
| |
| <meta name="description" content="Debugging with GDB: Lazy Strings In Python"> |
| <meta name="keywords" content="Debugging with GDB: Lazy Strings In Python"> |
| <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="Architectures-In-Python.html#Architectures-In-Python" rel="next" title="Architectures In Python"> |
| <link href="Finish-Breakpoints-in-Python.html#Finish-Breakpoints-in-Python" rel="prev" title="Finish Breakpoints in 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="Lazy-Strings-In-Python"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="Architectures-In-Python.html#Architectures-In-Python" accesskey="n" rel="next">Architectures In Python</a>, Previous: <a href="Finish-Breakpoints-in-Python.html#Finish-Breakpoints-in-Python" accesskey="p" rel="prev">Finish Breakpoints in 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="Python-representation-of-lazy-strings_002e"></a> |
| <h4 class="subsubsection">23.2.2.31 Python representation of lazy strings.</h4> |
| |
| <a name="index-lazy-strings-in-python"></a> |
| <a name="index-gdb_002eLazyString"></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.LazyString</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.LazyString</code> and a string wrapped within |
| a <code>gdb.Value</code> is that a <code>gdb.LazyString</code> will be treated |
| differently by <small>GDB</small> when printing. A <code>gdb.LazyString</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>A <code>gdb.LazyString</code> object has the following functions: |
| </p> |
| <dl> |
| <dt><a name="index-LazyString_002evalue"></a>Function: <strong>LazyString.value</strong> <em>()</em></dt> |
| <dd><p>Convert the <code>gdb.LazyString</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.LazyString</code>. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-LazyString_002eaddress"></a>Variable: <strong>LazyString.address</strong></dt> |
| <dd><p>This attribute holds the address of the string. This attribute is not |
| writable. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-LazyString_002elength"></a>Variable: <strong>LazyString.length</strong></dt> |
| <dd><p>This attribute holds the length of the string in characters. If the |
| length is -1, then the string will be fetched and encoded up to the |
| first null of appropriate width. This attribute is not writable. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-LazyString_002eencoding"></a>Variable: <strong>LazyString.encoding</strong></dt> |
| <dd><p>This attribute holds the encoding that will be applied to the string |
| 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. This attribute |
| is not writable. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-LazyString_002etype"></a>Variable: <strong>LazyString.type</strong></dt> |
| <dd><p>This attribute holds the type that is represented by the lazy string’s |
| type. For a lazy string this will always be a pointer type. To |
| resolve this to the lazy string’s character type, use the type’s |
| <code>target</code> method. See <a href="Types-In-Python.html#Types-In-Python">Types In Python</a>. This attribute is not |
| writable. |
| </p></dd></dl> |
| |
| <hr> |
| <div class="header"> |
| <p> |
| Next: <a href="Architectures-In-Python.html#Architectures-In-Python" accesskey="n" rel="next">Architectures In Python</a>, Previous: <a href="Finish-Breakpoints-in-Python.html#Finish-Breakpoints-in-Python" accesskey="p" rel="prev">Finish Breakpoints in 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> |
