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* stabs.texinfo (Builtin Type Descriptors): Document the floating

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point types used with @samp{R} type descriptor.
	(Symbol Descriptors): Describe how to handle conflict between
	different meanings of @samp{P} symbol descriptor.
This commit is contained in:
Jim Kingdon 1993-05-21 16:29:24 +00:00
parent c41e08c472
commit 1a8b566849
2 changed files with 45 additions and 17 deletions
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7
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@ -1,3 +1,10 @@
Fri May 21 11:20:31 1993 Jim Kingdon (kingdon@lioth.cygnus.com)
* stabs.texinfo (Builtin Type Descriptors): Document the floating
point types used with @samp{R} type descriptor.
(Symbol Descriptors): Describe how to handle conflict between
different meanings of @samp{P} symbol descriptor.
Thu May 20 13:35:10 1993 Jim Kingdon (kingdon@lioth.cygnus.com)
* stabs.texinfo: Remove node Quick Reference and put its children

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gdb/doc/stabs.texinfo
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@ -1208,7 +1208,8 @@ I'm not sure how a boolean type is represented.
There are various type descriptors to define builtin types:
@table @code
@c FIXME: clean up description of width and offset
@c FIXME: clean up description of width and offset, once we figure out
@c what they mean
@item b @var{signed} @var{char-flag} @var{width} ; @var{offset} ; @var{nbits} ;
Define an integral type. @var{signed} is @samp{u} for unsigned or
@samp{s} for signed. @var{char-flag} is @samp{c} which indicates this
@ -1233,11 +1234,32 @@ will be a digit, @samp{(}, or @samp{-} for a Pascal space type, or
Documented by AIX to define a wide character type, but their compiler
actually uses negative type numbers (@pxref{Negative Type Numbers}).
@item R @var{details} ; @var{bytes} ;
@c FIXME: What does @var{details} mean?
Define a floating point type. @var{details} is a number which has
details about the type, for example whether it is complex. @var{bytes}
is the number of bytes occupied by the type.
@item R @var{fp_type} ; @var{bytes} ;
Define a floating point type. @var{fp_type} has one of the following values:
@table @code
@item 1 (NF_SINGLE)
IEEE 32-bit (single precision) floating point format.
@item 2 (NF_DOUBLE)
IEEE 64-bit (double precision) floating point format.
@item 3 (NF_COMPLEX)
@item 4 (NF_COMPLEX16)
@item 5 (NF_COMPLEX32)
These are for complex numbers. A comment in
@file{include/aout/stab_gnu.h} describes them as Fortran complex, double
complex, and complex*16, respectively, but what does that mean? (i.e.
Single precision? Double precison?).
@item 6 (NF_LDOUBLE)
Long double. It would be cleaner to define a different code for every
possible format of long double.
@end table
@var{bytes} is the number of bytes occupied by the type. This allows a
debugger to perform some operations with the type even if it doesn't
understand @var{fp_code}.
@item g @var{type-information} ; @var{nbits}
Documented by AIX to define a floating type, but their compiler actually
@ -2923,11 +2945,12 @@ Argument list parameter, @xref{Parameters}.
FORTRAN Function parameter, @xref{Parameters}.
@item P
Global Procedure (AIX), @xref{Procedures}. Register parameter (GNU),
@xref{Parameters}. These two uses can be distinguised because a
register parameter uses N_PSYM and a procedure uses some other symbol
type. Prototype of function referenced by this file (Sun acc) (have not
yet investigated this conflict. FIXME).
Unfortunately, three separate meanings have been independently invented
for this symbol descriptor. At least the GNU and Sun uses can be
distinguished by the symbol type. Global Procedure (AIX) (symbol type
used unknown), @xref{Procedures}. Register parameter (GNU) (symbol type
N_PSYM), @xref{Parameters}. Prototype of function referenced by this
file (Sun acc) (symbol type N_FUN).
@item Q
Static Procedure, @xref{Procedures}.
@ -3631,9 +3654,6 @@ dbx?
@appendix Differences between GNU stabs in a.out and GNU stabs in xcoff
@c FIXME: Merge *all* these into the main body of the document.
@c Progress report: I have merged all the information from the
@c "dbx stabstring grammar" section of the AIX documentation into
@c the main body of this document, except the types.
(The AIX/RS6000 native object file format is xcoff with stabs). This
appendix only covers those differences which are not covered in the main
body of this document.
@ -3644,9 +3664,10 @@ Instead of .stabs, xcoff uses .stabx.
@item
The data fields of an xcoff .stabx are in a different order than an
a.out .stabs. The order is: string, value, type. The desc and null
fields present in a.out stabs are missing in xcoff stabs. For N_GSYM
the value field is the name of the symbol.
a.out .stabs. The order is: string, value, type, sdb-type. The desc
and null fields present in a.out stabs are missing in xcoff stabs. For
N_GSYM the value field is the name of the symbol. sdb-type is unused
with stabs; it can always be set to 0.
@item
BSD a.out stab types correspond to AIX xcoff storage classes. In general the