sim: delete dead current_state globals

The global current_state handle to the current simulator state is a
design idea that was half implemented, but never really cleaned up.
The point was to have a global variable pointing to the state so that
funcs could more quickly & easily access the state anywhere.  We've
instead moved in the direction of passing state around everywhere and
don't have any intention of moving back.

I also can't find any references to gdb using this variable, or to
cgen related "dump_regs" functions, both of which were used in the
comments related to this code.

4 files changed, 6 insertions, 32 deletions

diff --git a/sim/common/ChangeLog b/sim/common/ChangeLog
index 58ffa6c..65a0abf 100644
--- a/sim/common/ChangeLog
+++ b/sim/common/ChangeLog
@@ -1,3 +1,9 @@
+2016-01-02  Mike Frysinger  <vapier@gentoo.org>
+
+	* cgen-defs.h (current_state): Delete.
+	* sim-base.h (CURRENT_STATE_REG, CURRENT_STATE): Delete.
+	* sim-utils.c (current_state): Delete.
+
 2015-12-30  Mike Frysinger  <vapier@gentoo.org>
 
 	* sim-module.c (sim_pre_argv_init): Change STATE_MY_NAME assignment
diff --git a/sim/common/cgen-defs.h b/sim/common/cgen-defs.h
index be717f8..c42db9b 100644
--- a/sim/common/cgen-defs.h
+++ b/sim/common/cgen-defs.h
@@ -140,12 +140,6 @@ typedef enum {
 
 /* Simulator state.  */
 
-/* Records simulator descriptor so utilities like @cpu@_dump_regs can be
-   called from gdb.  */
-extern SIM_DESC current_state;
-
-/* Simulator state.  */
-
 /* CGEN_STATE contains additional state information not present in
    sim_state_base.  */
 
diff --git a/sim/common/sim-base.h b/sim/common/sim-base.h
index a0e7090..350b352 100644
--- a/sim/common/sim-base.h
+++ b/sim/common/sim-base.h
@@ -89,28 +89,6 @@ typedef struct _sim_cpu sim_cpu;
 #include "sim-memopt.h"
 #include "sim-cpu.h"
 
-/* Global pointer to current state while sim_resume is running.
-   On a machine with lots of registers, it might be possible to reserve
-   one of them for current_state.  However on a machine with few registers
-   current_state can't permanently live in one and indirecting through it
-   will be slower [in which case one can have sim_resume set globals from
-   current_state for faster access].
-   If CURRENT_STATE_REG is defined, it means current_state is living in
-   a global register.  */
-
-
-#ifdef CURRENT_STATE_REG
-/* FIXME: wip */
-#else
-extern struct sim_state *current_state;
-#endif
-
-
-/* The simulator may provide different (and faster) definition.  */
-#ifndef CURRENT_STATE
-#define CURRENT_STATE current_state
-#endif
-
 
 /* We require all sims to dynamically allocate cpus.  See comment up top about
    struct sim_state.  */
diff --git a/sim/common/sim-utils.c b/sim/common/sim-utils.c
index 5439b8b..d2b5f7c 100644
--- a/sim/common/sim-utils.c
+++ b/sim/common/sim-utils.c
@@ -48,10 +48,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "bfd.h"
 #include "sim-utils.h"
 
-/* Global pointer to all state data.
-   Set by sim_resume.  */
-struct sim_state *current_state;
-
 /* Allocate zero filled memory with xcalloc - xcalloc aborts if the
    allocation fails.  */