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* stabs.texinfo (Macro define and undefine): New node describing 

stabs for #define and #undef.
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Eli Zaretskii 2006-10-31 22:38:27 +00:00
parent 3ba674705b
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gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2006-10-31 David Taylor <dtaylor@emc.com>
* stabs.texinfo (Macro define and undefine): New node describing
stabs for #define and #undef.
2006-10-27 Andreas Schwab <schwab@suse.de>
* gdb.texinfo (Processes): Rename "detach-fork" to "detach fork".

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gdb/doc/stabs.texinfo
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@ -67,6 +67,7 @@ This document describes the stabs debugging format.
* Constants:: Constants
* Variables::
* Types:: Type definitions
* Macro define and undefine:: Representation of #define and #undef
* Symbol Tables:: Symbol information in symbol tables
* Cplusplus:: Stabs specific to C++
* Stab Types:: Symbol types in a.out files
@ -2220,6 +2221,70 @@ generates the following code:
The variable defines a new type, 24, which is a pointer to another new
type, 25, which is a function returning @code{int}.
@node Macro define and undefine
@chapter Representation of #define and #undef
This section describes the stabs support for macro define and undefine
information, supported on some systems. (e.g., with @option{-g3}
@option{-gstabs} when using GCC).
A @code{#define @var{macro-name} @var{macro-body}} is represented with
an @code{N_MAC_DEFINE} stab with a string field of
@code{@var{macro-name} @var{macro-body}}.
@findex N_MAC_DEFINE
An @code{#undef @var{macro-name}} is represented with an
@code{N_MAC_UNDEF} stabs with a string field of simply
@code{@var{macro-name}}.
@findex N_MAC_UNDEF
For both @code{N_MAC_DEFINE} and @code{N_MAC_UNDEF}, the desc field is
the line number within the file where the corresponding @code{#define}
or @code{#undef} occurred.
For example, the following C code:
@example
#define NONE 42
#define TWO(a, b) (a + (a) + 2 * b)
#define ONE(c) (c + 19)
main(int argc, char *argv[])
@{
func(NONE, TWO(10, 11));
func(NONE, ONE(23));
#undef ONE
#define ONE(c) (c + 23)
func(NONE, ONE(-23));
return (0);
@}
int global;
func(int arg1, int arg2)
@{
global = arg1 + arg2;
@}
@end example
@noindent
produces the following stabs (as well as many others):
@example
.stabs "NONE 42",54,0,1,0
.stabs "TWO(a,b) (a + (a) + 2 * b)",54,0,2,0
.stabs "ONE(c) (c + 19)",54,0,3,0
.stabs "ONE",58,0,10,0
.stabs "ONE(c) (c + 23)",54,0,11,0
@end example
@noindent
NOTE: In the above example, @code{54} is @code{N_MAC_DEFINE} and
@code{58} is @code{N_MAC_UNDEF}.
@node Symbol Tables
@chapter Symbol Information in Symbol Tables
@ -3276,11 +3341,17 @@ Number of symbols (according to Ultrix V4.0); see @ref{N_NSYMS}.
@item 0x34 N_NOMAP
No DST map; see @ref{N_NOMAP}.
@item 0x36 N_MAC_DEFINE
Name and body of a @code{#define}d macro; see @ref{Macro define and undefine}.
@c FIXME: describe this solaris feature in the body of the text (see
@c comments in include/aout/stab.def).
@item 0x38 N_OBJ
Object file (Solaris2).
@item 0x3a N_MAC_UNDEF
Name of an @code{#undef}ed macro; see @ref{Macro define and undefine}.
@c See include/aout/stab.def for (a little) more info.
@item 0x3c N_OPT
Debugger options (Solaris2).