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Kevin Buettner df433d3162 Distinguish sentinel frame from null frame.
This patch replaces the `current_frame' static global in frame.c with
`sentinel_frame'.  It also makes the sentinel frame id unique and
different from the null frame.

By itself, there is not much point to this patch, but it makes
the code cleaner for the VALUE_FRAME_ID changes in another patch.
Since we now allow "navigation" to the sentinel frame, it removes
the necessity of adding special cases to other parts of GDB.

Note that a new function, get_next_frame_sentinel_okay, is introduced
in this patch.  It will be used by the VALUE_FRAME_ID changes that
I've made.

Thanks to Pedro Alves for this suggestion.

gdb/ChangeLog:

    	* frame.h (enum frame_id_stack_status): Add FID_STACK_SENTINEL.
    	(struct frame_id): Increase number of bits required for storing
    	stack status to 3 from 2.
    	(sentinel_frame_id): New declaration.
    	(get_next_frame_sentinel_okay): Declare.
    	(frame_find_by_id_sentinel_okay): Declare.
    	* frame.c (current_frame): Rename this static global to...
    	(sentinel_frame): ...this static global, which has also been
    	moved an earlier location in the file.
    	(fprint_frame_id): Add case for sentinel frame id.
    	(get_frame_id): Return early for sentinel frame.
    	(sentinel_frame_id): Define.
    	(frame_find_by_id): Add case for sentinel_frame_id.
    	(create_sentinel_frame): Use sentinel_frame_id for this_id.value
    	instead of null_frame_id.
    	(get_current_frame): Add local declaration for `current_frame'.
    	Remove local declaration for `sentinel_frame.'
    	(get_next_frame_sentinel_okay): New function.
    	(reinit_frame_cache): Use `sentinel_frame' in place of
    	`current_frame'.
2016-11-16 11:37:11 -07:00
bfd Fix PR20789 - relaxation with negative valued diff relocs 2016-11-16 16:11:46 +05:30
binutils Generate correct hint value for IDATA6. 2016-11-14 16:30:45 +00:00
config
cpu
elfcpp
etc
gas Fix SPARC relocations generated for the .eh_frame section. 2016-11-15 15:41:27 +00:00
gdb Distinguish sentinel frame from null frame. 2016-11-16 11:37:11 -07:00
gold Add missing '$' in configure.ac. 2016-11-07 08:00:21 -08:00
gprof
include [AArch64] Add ARMv8.3 PACGA instruction 2016-11-11 10:39:46 +00:00
intl
ld Fix PR20789 - relaxation with negative valued diff relocs 2016-11-16 16:11:46 +05:30
libdecnumber
libiberty
opcodes [AArch64] Add ARMv8.3 combined pointer authentication branch instructions 2016-11-11 10:43:15 +00:00
readline
sim sim: mips: add PR info to ChangeLog 2016-11-12 01:02:23 -05:00
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ChangeLog Sync config.sub,config.guess with upstream. 2016-11-07 13:08:55 -08:00
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config.guess Sync config.sub,config.guess with upstream. 2016-11-07 13:08:55 -08:00
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config.sub Sync config.sub,config.guess with upstream. 2016-11-07 13:08:55 -08:00
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.