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152 lines
6.2 KiB
HTML
152 lines
6.2 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>tdump (Debugging with GDB)</title>
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<meta name="description" content="tdump (Debugging with GDB)">
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<meta name="keywords" content="tdump (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="Analyze-Collected-Data.html#Analyze-Collected-Data" rel="up" title="Analyze Collected Data">
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<link href="save-tracepoints.html#save-tracepoints" rel="next" title="save tracepoints">
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<link href="tfind.html#tfind" rel="prev" title="tfind">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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ul.no-bullet {list-style: none}
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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="tdump"></a>
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<div class="header">
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<p>
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Next: <a href="save-tracepoints.html#save-tracepoints" accesskey="n" rel="next">save tracepoints</a>, Previous: <a href="tfind.html#tfind" accesskey="p" rel="prev">tfind</a>, Up: <a href="Analyze-Collected-Data.html#Analyze-Collected-Data" accesskey="u" rel="up">Analyze Collected Data</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="tdump-1"></a>
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<h4 class="subsection">13.2.2 <code>tdump</code></h4>
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<a name="index-tdump"></a>
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<a name="index-dump-all-data-collected-at-tracepoint"></a>
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<a name="index-tracepoint-data_002c-display"></a>
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<p>This command takes no arguments. It prints all the data collected at
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the current trace snapshot.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) <b>trace 444</b>
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(gdb) <b>actions</b>
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Enter actions for tracepoint #2, one per line:
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> collect $regs, $locals, $args, gdb_long_test
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> end
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(gdb) <b>tstart</b>
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(gdb) <b>tfind line 444</b>
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#0 gdb_test (p1=0x11, p2=0x22, p3=0x33, p4=0x44, p5=0x55, p6=0x66)
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at gdb_test.c:444
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444 printp( "%s: arguments = 0x%X 0x%X 0x%X 0x%X 0x%X 0x%X\n", )
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(gdb) <b>tdump</b>
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Data collected at tracepoint 2, trace frame 1:
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d0 0xc4aa0085 -995491707
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d1 0x18 24
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d2 0x80 128
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d3 0x33 51
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d4 0x71aea3d 119204413
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d5 0x22 34
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d6 0xe0 224
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d7 0x380035 3670069
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a0 0x19e24a 1696330
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a1 0x3000668 50333288
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a2 0x100 256
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a3 0x322000 3284992
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a4 0x3000698 50333336
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a5 0x1ad3cc 1758156
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fp 0x30bf3c 0x30bf3c
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sp 0x30bf34 0x30bf34
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ps 0x0 0
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pc 0x20b2c8 0x20b2c8
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fpcontrol 0x0 0
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fpstatus 0x0 0
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fpiaddr 0x0 0
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p = 0x20e5b4 "gdb-test"
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p1 = (void *) 0x11
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p2 = (void *) 0x22
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p3 = (void *) 0x33
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p4 = (void *) 0x44
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p5 = (void *) 0x55
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p6 = (void *) 0x66
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gdb_long_test = 17 '\021'
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(gdb)
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</pre></div>
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<p><code>tdump</code> works by scanning the tracepoint’s current collection
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actions and printing the value of each expression listed. So
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<code>tdump</code> can fail, if after a run, you change the tracepoint’s
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actions to mention variables that were not collected during the run.
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</p>
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<p>Also, for tracepoints with <code>while-stepping</code> loops, <code>tdump</code>
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uses the collected value of <code>$pc</code> to distinguish between trace
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frames that were collected at the tracepoint hit, and frames that were
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collected while stepping. This allows it to correctly choose whether
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to display the basic list of collections, or the collections from the
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body of the while-stepping loop. However, if <code>$pc</code> was not collected,
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then <code>tdump</code> will always attempt to dump using the basic collection
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list, and may fail if a while-stepping frame does not include all the
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same data that is collected at the tracepoint hit.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="save-tracepoints.html#save-tracepoints" accesskey="n" rel="next">save tracepoints</a>, Previous: <a href="tfind.html#tfind" accesskey="p" rel="prev">tfind</a>, Up: <a href="Analyze-Collected-Data.html#Analyze-Collected-Data" accesskey="u" rel="up">Analyze Collected Data</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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