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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/Output.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/Output.html b/share/doc/gdb/Output.html new file mode 100644 index 0000000..740ad30 --- /dev/null +++ b/share/doc/gdb/Output.html @@ -0,0 +1,226 @@ +<!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: Output</title> + +<meta name="description" content="Debugging with GDB: Output"> +<meta name="keywords" content="Debugging with GDB: Output"> +<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="Sequences.html#Sequences" rel="up" title="Sequences"> +<link href="Auto_002dloading-sequences.html#Auto_002dloading-sequences" rel="next" title="Auto-loading sequences"> +<link href="Command-Files.html#Command-Files" rel="previous" title="Command Files"> +<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="Output"></a> +<div class="header"> +<p> +Next: <a href="Auto_002dloading-sequences.html#Auto_002dloading-sequences" accesskey="n" rel="next">Auto-loading sequences</a>, Previous: <a href="Command-Files.html#Command-Files" accesskey="p" rel="previous">Command Files</a>, Up: <a href="Sequences.html#Sequences" accesskey="u" rel="up">Sequences</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="Commands-for-Controlled-Output"></a> +<h4 class="subsection">23.1.4 Commands for Controlled Output</h4> + +<p>During the execution of a command file or a user-defined command, normal +<small>GDB</small> output is suppressed; the only output that appears is what is +explicitly printed by the commands in the definition. This section +describes three commands useful for generating exactly the output you +want. +</p> +<dl compact="compact"> +<dd><a name="index-echo"></a> +</dd> +<dt><code>echo <var>text</var></code></dt> +<dd><p>Print <var>text</var>. Nonprinting characters can be included in +<var>text</var> using C escape sequences, such as ‘<samp>\n</samp>’ to print a +newline. <strong>No newline is printed unless you specify one.</strong> +In addition to the standard C escape sequences, a backslash followed +by a space stands for a space. This is useful for displaying a +string with spaces at the beginning or the end, since leading and +trailing spaces are otherwise trimmed from all arguments. +To print ‘<samp> <!-- /@w -->and foo = <!-- /@w --></samp>’, use the command +‘<samp>echo \ <!-- /@w -->and foo = \ <!-- /@w --></samp>’. +</p> +<p>A backslash at the end of <var>text</var> can be used, as in C, to continue +the command onto subsequent lines. For example, +</p> +<div class="smallexample"> +<pre class="smallexample">echo This is some text\n\ +which is continued\n\ +onto several lines.\n +</pre></div> + +<p>produces the same output as +</p> +<div class="smallexample"> +<pre class="smallexample">echo This is some text\n +echo which is continued\n +echo onto several lines.\n +</pre></div> + +<a name="index-output"></a> +</dd> +<dt><code>output <var>expression</var></code></dt> +<dd><p>Print the value of <var>expression</var> and nothing but that value: no +newlines, no ‘<samp>$<var>nn</var> = </samp>’. The value is not entered in the +value history either. See <a href="Expressions.html#Expressions">Expressions</a>, for more information +on expressions. +</p> +</dd> +<dt><code>output/<var>fmt</var> <var>expression</var></code></dt> +<dd><p>Print the value of <var>expression</var> in format <var>fmt</var>. You can use +the same formats as for <code>print</code>. See <a href="Output-Formats.html#Output-Formats">Output +Formats</a>, for more information. +</p> +<a name="index-printf"></a> +</dd> +<dt><code>printf <var>template</var>, <var>expressions</var>…</code></dt> +<dd><p>Print the values of one or more <var>expressions</var> under the control of +the string <var>template</var>. To print several values, make +<var>expressions</var> be a comma-separated list of individual expressions, +which may be either numbers or pointers. Their values are printed as +specified by <var>template</var>, exactly as a C program would do by +executing the code below: +</p> +<div class="smallexample"> +<pre class="smallexample">printf (<var>template</var>, <var>expressions</var>…); +</pre></div> + +<p>As in <code>C</code> <code>printf</code>, ordinary characters in <var>template</var> +are printed verbatim, while <em>conversion specification</em> introduced +by the ‘<samp>%</samp>’ character cause subsequent <var>expressions</var> to be +evaluated, their values converted and formatted according to type and +style information encoded in the conversion specifications, and then +printed. +</p> +<p>For example, you can print two values in hex like this: +</p> +<div class="smallexample"> +<pre class="smallexample">printf "foo, bar-foo = 0x%x, 0x%x\n", foo, bar-foo +</pre></div> + +<p><code>printf</code> supports all the standard <code>C</code> conversion +specifications, including the flags and modifiers between the ‘<samp>%</samp>’ +character and the conversion letter, with the following exceptions: +</p> +<ul> +<li> The argument-ordering modifiers, such as ‘<samp>2$</samp>’, are not supported. + +</li><li> The modifier ‘<samp>*</samp>’ is not supported for specifying precision or +width. + +</li><li> The ‘<samp>'</samp>’ flag (for separation of digits into groups according to +<code>LC_NUMERIC'</code>) is not supported. + +</li><li> The type modifiers ‘<samp>hh</samp>’, ‘<samp>j</samp>’, ‘<samp>t</samp>’, and ‘<samp>z</samp>’ are not +supported. + +</li><li> The conversion letter ‘<samp>n</samp>’ (as in ‘<samp>%n</samp>’) is not supported. + +</li><li> The conversion letters ‘<samp>a</samp>’ and ‘<samp>A</samp>’ are not supported. +</li></ul> + +<p>Note that the ‘<samp>ll</samp>’ type modifier is supported only if the +underlying <code>C</code> implementation used to build <small>GDB</small> supports +the <code>long long int</code> type, and the ‘<samp>L</samp>’ type modifier is +supported only if <code>long double</code> type is available. +</p> +<p>As in <code>C</code>, <code>printf</code> supports simple backslash-escape +sequences, such as <code>\n</code>, ‘<samp>\t</samp>’, ‘<samp>\\</samp>’, ‘<samp>\"</samp>’, +‘<samp>\a</samp>’, and ‘<samp>\f</samp>’, that consist of backslash followed by a +single character. Octal and hexadecimal escape sequences are not +supported. +</p> +<p>Additionally, <code>printf</code> supports conversion specifications for DFP +(<em>Decimal Floating Point</em>) types using the following length modifiers +together with a floating point specifier. +letters: +</p> +<ul> +<li> ‘<samp>H</samp>’ for printing <code>Decimal32</code> types. + +</li><li> ‘<samp>D</samp>’ for printing <code>Decimal64</code> types. + +</li><li> ‘<samp>DD</samp>’ for printing <code>Decimal128</code> types. +</li></ul> + +<p>If the underlying <code>C</code> implementation used to build <small>GDB</small> has +support for the three length modifiers for DFP types, other modifiers +such as width and precision will also be available for <small>GDB</small> to use. +</p> +<p>In case there is no such <code>C</code> support, no additional modifiers will be +available and the value will be printed in the standard way. +</p> +<p>Here’s an example of printing DFP types using the above conversion letters: +</p><div class="smallexample"> +<pre class="smallexample">printf "D32: %Hf - D64: %Df - D128: %DDf\n",1.2345df,1.2E10dd,1.2E1dl +</pre></div> + +<a name="eval"></a><a name="index-eval"></a> +</dd> +<dt><code>eval <var>template</var>, <var>expressions</var>…</code></dt> +<dd><p>Convert the values of one or more <var>expressions</var> under the control of +the string <var>template</var> to a command line, and call it. +</p> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Auto_002dloading-sequences.html#Auto_002dloading-sequences" accesskey="n" rel="next">Auto-loading sequences</a>, Previous: <a href="Command-Files.html#Command-Files" accesskey="p" rel="previous">Command Files</a>, Up: <a href="Sequences.html#Sequences" accesskey="u" rel="up">Sequences</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> |