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study/Ref-docs/manual gdb/stabs/stabs_3.html
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study/Ref-docs/manual gdb/stabs/stabs_3.html
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<HTML>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Created on March, 13 2002 by texi2html 1.64 -->
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<!--
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Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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Karl Berry <karl@freefriends.org>
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Olaf Bachmann <obachman@mathematik.uni-kl.de>
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and many others.
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Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>
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Send bugs and suggestions to <texi2html@mathematik.uni-kl.de>
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-->
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<HEAD>
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<TITLE>STABS: Constants</TITLE>
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<META NAME="description" CONTENT="STABS: Constants">
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<META NAME="keywords" CONTENT="STABS: Constants">
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<BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000">
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<A NAME="SEC16"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_2.html#SEC15"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_4.html#SEC17"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_4.html#SEC17"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_4.html#SEC17"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_14.html#SEC90">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H1> 3. Constants </H1>
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<!--docid::SEC16::-->
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<P>
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The <SAMP>`c'</SAMP> symbol descriptor indicates that this stab represents a
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constant. This symbol descriptor is an exception to the general rule
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that symbol descriptors are followed by type information. Instead, it
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is followed by <SAMP>`='</SAMP> and one of the following:
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</P><P>
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<DL COMPACT>
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<DT><CODE>b <VAR>value</VAR></CODE>
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<DD>Boolean constant. <VAR>value</VAR> is a numeric value; I assume it is 0 for
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false or 1 for true.
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<P>
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<DT><CODE>c <VAR>value</VAR></CODE>
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<DD>Character constant. <VAR>value</VAR> is the numeric value of the constant.
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<P>
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<DT><CODE>e <VAR>type-information</VAR> , <VAR>value</VAR></CODE>
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<DD>Constant whose value can be represented as integral.
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<VAR>type-information</VAR> is the type of the constant, as it would appear
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after a symbol descriptor (see section <A HREF="stabs_1.html#SEC4">1.3 The String Field</A>). <VAR>value</VAR> is the
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numeric value of the constant. GDB 4.9 does not actually get the right
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value if <VAR>value</VAR> does not fit in a host <CODE>int</CODE>, but it does not
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do anything violent, and future debuggers could be extended to accept
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integers of any size (whether unsigned or not). This constant type is
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usually documented as being only for enumeration constants, but GDB has
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never imposed that restriction; I don't know about other debuggers.
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<P>
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<DT><CODE>i <VAR>value</VAR></CODE>
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<DD>Integer constant. <VAR>value</VAR> is the numeric value. The type is some
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sort of generic integer type (for GDB, a host <CODE>int</CODE>); to specify
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the type explicitly, use <SAMP>`e'</SAMP> instead.
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<P>
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<DT><CODE>r <VAR>value</VAR></CODE>
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<DD>Real constant. <VAR>value</VAR> is the real value, which can be <SAMP>`INF'</SAMP>
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(optionally preceded by a sign) for infinity, <SAMP>`QNAN'</SAMP> for a quiet
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NaN (not-a-number), or <SAMP>`SNAN'</SAMP> for a signalling NaN. If it is a
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normal number the format is that accepted by the C library function
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<CODE>atof</CODE>.
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<P>
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<DT><CODE>s <VAR>string</VAR></CODE>
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<DD>String constant. <VAR>string</VAR> is a string enclosed in either <SAMP>`''</SAMP>
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(in which case <SAMP>`''</SAMP> characters within the string are represented as
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<SAMP>`\''</SAMP> or <SAMP>`"'</SAMP> (in which case <SAMP>`"'</SAMP> characters within the
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string are represented as <SAMP>`\"'</SAMP>).
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<P>
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<DT><CODE>S <VAR>type-information</VAR> , <VAR>elements</VAR> , <VAR>bits</VAR> , <VAR>pattern</VAR></CODE>
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<DD>Set constant. <VAR>type-information</VAR> is the type of the constant, as it
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would appear after a symbol descriptor (see section <A HREF="stabs_1.html#SEC4">1.3 The String Field</A>).
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<VAR>elements</VAR> is the number of elements in the set (does this means
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how many bits of <VAR>pattern</VAR> are actually used, which would be
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redundant with the type, or perhaps the number of bits set in
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<VAR>pattern</VAR>? I don't get it), <VAR>bits</VAR> is the number of bits in the
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constant (meaning it specifies the length of <VAR>pattern</VAR>, I think),
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and <VAR>pattern</VAR> is a hexadecimal representation of the set. AIX
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documentation refers to a limit of 32 bytes, but I see no reason why
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this limit should exist. This form could probably be used for arbitrary
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constants, not just sets; the only catch is that <VAR>pattern</VAR> should be
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understood to be target, not host, byte order and format.
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</DL>
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<P>
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The boolean, character, string, and set constants are not supported by
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GDB 4.9, but it ignores them. GDB 4.8 and earlier gave an error
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message and refused to read symbols from the file containing the
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constants.
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</P><P>
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The above information is followed by <SAMP>`;'</SAMP>.
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</P><P>
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<A NAME="Variables"></A>
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<HR SIZE="6">
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_4.html#SEC17"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_4.html#SEC17"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_14.html#SEC90">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="stabs_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<BR>
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<FONT SIZE="-1">
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This document was generated
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by <I>GDB Administrator</I> on <I>March, 13 2002</I>
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using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
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