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diff --git a/share/doc/stabs/Questions.html b/share/doc/stabs/Questions.html new file mode 100644 index 0000000..c2dc465 --- /dev/null +++ b/share/doc/stabs/Questions.html @@ -0,0 +1,102 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1992-2023 Free Software Foundation, Inc. +Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, +and David MacKenzie. + +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 no +Invariant Sections, with no Front-Cover Texts, and with no Back-Cover +Texts. A copy of the license is included in the section entitled "GNU +Free Documentation License". --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>STABS: Questions</title> + +<meta name="description" content="STABS: Questions"> +<meta name="keywords" content="STABS: Questions"> +<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="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="index.html#Top" rel="up" title="Top"> +<link href="Stab-Sections.html#Stab-Sections" rel="next" title="Stab Sections"> +<link href="N_005fLENG.html#N_005fLENG" rel="previous" title="N_LENG"> +<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="Questions"></a> +<div class="header"> +<p> +Next: <a href="Stab-Sections.html#Stab-Sections" accesskey="n" rel="next">Stab Sections</a>, Previous: <a href="Expanded-Reference.html#Expanded-Reference" accesskey="p" rel="previous">Expanded Reference</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Questions-and-Anomalies"></a> +<h2 class="appendix">Appendix E Questions and Anomalies</h2> + +<ul> +<li> For GNU C stabs defining local and global variables (<code>N_LSYM</code> and +<code>N_GSYM</code>), the desc field is supposed to contain the source +line number on which the variable is defined. In reality the desc +field is always 0. (This behavior is defined in <samp>dbxout.c</samp> and +putting a line number in desc is controlled by ‘<samp>#ifdef +WINNING_GDB</samp>’, which defaults to false). GDB supposedly uses this +information if you say ‘<samp>list <var>var</var></samp>’. In reality, <var>var</var> can +be a variable defined in the program and GDB says ‘<samp>function +<var>var</var> not defined</samp>’. + +</li><li> In GNU C stabs, there seems to be no way to differentiate tag types: +structures, unions, and enums (symbol descriptor ‘<samp>T</samp>’) and typedefs +(symbol descriptor ‘<samp>t</samp>’) defined at file scope from types defined locally +to a procedure or other more local scope. They all use the <code>N_LSYM</code> +stab type. Types defined at procedure scope are emitted after the +<code>N_RBRAC</code> of the preceding function and before the code of the +procedure in which they are defined. This is exactly the same as +types defined in the source file between the two procedure bodies. +GDB over-compensates by placing all types in block #1, the block for +symbols of file scope. This is true for default, ‘<samp>-ansi</samp>’ and +‘<samp>-traditional</samp>’ compiler options. (Bugs gcc/1063, gdb/1066.) + +</li><li> What ends the procedure scope? Is it the proc block’s <code>N_RBRAC</code> or the +next <code>N_FUN</code>? (I believe its the first.) +</li></ul> + + + + +</body> +</html> |