const-fy regcache::m_aspace

regcache::m_aspace is a const, never changed during the lifetime of
regcache object.  The address_space object is a const object too.

gdb:

2017-11-02  Yao Qi  <yao.qi@linaro.org>

	* breakpoint.c (insert_single_step_breakpoints): Update.
	* frame.c (struct frame_info) <aspace>: Add const.
	(frame_save_as_regcache): Add const.
	(get_frame_address_space): Return const address_space *.
	* frame.h (get_frame_address_space): Update declaration.
	* infrun.c (struct step_over_info) <aspace>: Add const.
	(set_step_over_info): Make aspace const.
	(displaced_step_prepare_throw): Change variable const.
	(resume): Likewise.
	(proceed): Likewise.
	(adjust_pc_after_break): Likewise.
	(save_waitstatus): Likewise.
	(handle_signal_stop): Likewise.
	(keep_going_pass_signal): Likewise.
	* jit.c (jit_frame_sniffer): Add const.
	* mips-tdep.c (mips_single_step_through_delay): Likewise.
	* ppc-linux-tdep.c (ppu2spu_sniffer): Likewise.
	* record-full.c (record_full_wait_1): Likewise.
	* regcache.c (regcache::regcache): Change parameter to const.
	* regcache.h (regcache::regcache): Likewise.
	(regcache::aspace): Return const address_space *.
	(regcache) <m_aspace>: Add const.

11 files changed, 56 insertions, 31 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9d846ab..c1a0cbe4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,30 @@
 2017-11-02  Yao Qi  <yao.qi@linaro.org>
 
+	* breakpoint.c (insert_single_step_breakpoints): Update.
+	* frame.c (struct frame_info) <aspace>: Add const.
+	(frame_save_as_regcache): Add const.
+	(get_frame_address_space): Return const address_space *.
+	* frame.h (get_frame_address_space): Update declaration.
+	* infrun.c (struct step_over_info) <aspace>: Add const.
+	(set_step_over_info): Make aspace const.
+	(displaced_step_prepare_throw): Change variable const.
+	(resume): Likewise.
+	(proceed): Likewise.
+	(adjust_pc_after_break): Likewise.
+	(save_waitstatus): Likewise.
+	(handle_signal_stop): Likewise.
+	(keep_going_pass_signal): Likewise.
+	* jit.c (jit_frame_sniffer): Add const.
+	* mips-tdep.c (mips_single_step_through_delay): Likewise.
+	* ppc-linux-tdep.c (ppu2spu_sniffer): Likewise.
+	* record-full.c (record_full_wait_1): Likewise.
+	* regcache.c (regcache::regcache): Change parameter to const.
+	* regcache.h (regcache::regcache): Likewise.
+	(regcache::aspace): Return const address_space *.
+	(regcache) <m_aspace>: Add const.
+
+2017-11-02  Yao Qi  <yao.qi@linaro.org>
+
 	* darwin-nat.c (cancel_breakpoint): Use regcache->aspace ().
 	* frame.c (create_sentinel_frame): Likewise.
 	* infrun.c (displaced_step_prepare_throw): Likewise.
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index aadd6ca..0bf47d5 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -14557,7 +14557,7 @@ insert_single_step_breakpoints (struct gdbarch *gdbarch)
   if (!next_pcs.empty ())
     {
       struct frame_info *frame = get_current_frame ();
-      struct address_space *aspace = get_frame_address_space (frame);
+      const address_space *aspace = get_frame_address_space (frame);
 
       for (CORE_ADDR pc : next_pcs)
 	insert_single_step_breakpoint (gdbarch, aspace, pc);
diff --git a/gdb/frame.c b/gdb/frame.c
index 5380c7d..e40685f 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -99,7 +99,7 @@ struct frame_info
   struct program_space *pspace;
 
   /* The frame's address space.  */
-  struct address_space *aspace;
+  const address_space *aspace;
 
   /* The frame's low-level unwinder and corresponding cache.  The
      low-level unwinder is responsible for unwinding register values
@@ -1020,7 +1020,7 @@ do_frame_register_read (void *src, int regnum, gdb_byte *buf)
 std::unique_ptr<struct regcache>
 frame_save_as_regcache (struct frame_info *this_frame)
 {
-  struct address_space *aspace = get_frame_address_space (this_frame);
+  const address_space *aspace = get_frame_address_space (this_frame);
   std::unique_ptr<struct regcache> regcache
     (new struct regcache (get_frame_arch (this_frame), aspace));
 
@@ -2643,7 +2643,7 @@ frame_unwind_program_space (struct frame_info *this_frame)
   return this_frame->pspace;
 }
 
-struct address_space *
+const address_space *
 get_frame_address_space (struct frame_info *frame)
 {
   return frame->aspace;
diff --git a/gdb/frame.h b/gdb/frame.h
index 190ce76..c751002 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -494,8 +494,10 @@ extern struct program_space *get_frame_program_space (struct frame_info *);
 /* Unwind THIS frame's program space from the NEXT frame.  */
 extern struct program_space *frame_unwind_program_space (struct frame_info *);
 
+class address_space;
+
 /* Return the frame's address space.  */
-extern struct address_space *get_frame_address_space (struct frame_info *);
+extern const address_space *get_frame_address_space (struct frame_info *);
 
 /* For frames where we can not unwind further, describe why.  */
 
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 0e31dbc..ef5a505 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1289,7 +1289,7 @@ struct step_over_info
      and address of the instruction the breakpoint is set at.  We'll
      skip inserting all breakpoints here.  Valid iff ASPACE is
      non-NULL.  */
-  struct address_space *aspace;
+  const address_space *aspace;
   CORE_ADDR address;
 
   /* The instruction being stepped over triggers a nonsteppable
@@ -1332,7 +1332,7 @@ static struct step_over_info step_over_info;
    because when we need the info later the thread may be running.  */
 
 static void
-set_step_over_info (struct address_space *aspace, CORE_ADDR address,
+set_step_over_info (const address_space *aspace, CORE_ADDR address,
 		    int nonsteppable_watchpoint_p,
 		    int thread)
 {
@@ -1760,7 +1760,7 @@ displaced_step_prepare_throw (ptid_t ptid)
   struct thread_info *tp = find_thread_ptid (ptid);
   struct regcache *regcache = get_thread_regcache (ptid);
   struct gdbarch *gdbarch = regcache->arch ();
-  struct address_space *aspace = regcache->aspace ();
+  const address_space *aspace = regcache->aspace ();
   CORE_ADDR original, copy;
   ULONGEST len;
   struct displaced_step_closure *closure;
@@ -2388,7 +2388,7 @@ resume (enum gdb_signal sig)
   struct gdbarch *gdbarch = regcache->arch ();
   struct thread_info *tp = inferior_thread ();
   CORE_ADDR pc = regcache_read_pc (regcache);
-  struct address_space *aspace = regcache->aspace ();
+  const address_space *aspace = regcache->aspace ();
   ptid_t resume_ptid;
   /* This represents the user's step vs continue request.  When
      deciding whether "set scheduler-locking step" applies, it's the
@@ -2983,7 +2983,6 @@ proceed (CORE_ADDR addr, enum gdb_signal siggnal)
   struct gdbarch *gdbarch;
   struct thread_info *tp;
   CORE_ADDR pc;
-  struct address_space *aspace;
   ptid_t resume_ptid;
   struct execution_control_state ecss;
   struct execution_control_state *ecs = &ecss;
@@ -3007,7 +3006,8 @@ proceed (CORE_ADDR addr, enum gdb_signal siggnal)
 
   regcache = get_current_regcache ();
   gdbarch = regcache->arch ();
-  aspace = regcache->aspace ();
+  const address_space *aspace = regcache->aspace ();
+
   pc = regcache_read_pc (regcache);
   tp = inferior_thread ();
 
@@ -4070,7 +4070,6 @@ adjust_pc_after_break (struct thread_info *thread,
 {
   struct regcache *regcache;
   struct gdbarch *gdbarch;
-  struct address_space *aspace;
   CORE_ADDR breakpoint_pc, decr_pc;
 
   /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP.  If
@@ -4150,7 +4149,7 @@ adjust_pc_after_break (struct thread_info *thread,
   if (decr_pc == 0)
     return;
 
-  aspace = regcache->aspace ();
+  const address_space *aspace = regcache->aspace ();
 
   /* Find the location where (if we've hit a breakpoint) the
      breakpoint would be.  */
@@ -4385,7 +4384,6 @@ static void
 save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws)
 {
   struct regcache *regcache;
-  struct address_space *aspace;
 
   if (debug_infrun)
     {
@@ -4404,7 +4402,7 @@ save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws)
   tp->suspend.waitstatus_pending_p = 1;
 
   regcache = get_thread_regcache (tp->ptid);
-  aspace = regcache->aspace ();
+  const address_space *aspace = regcache->aspace ();
 
   if (ws->kind == TARGET_WAITKIND_STOPPED
       && ws->value.sig == GDB_SIGNAL_TRAP)
@@ -5776,11 +5774,11 @@ handle_signal_stop (struct execution_control_state *ecs)
   if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP)
     {
       struct regcache *regcache;
-      struct address_space *aspace;
       CORE_ADDR pc;
 
       regcache = get_thread_regcache (ecs->ptid);
-      aspace = regcache->aspace ();
+      const address_space *aspace = regcache->aspace ();
+
       pc = regcache_read_pc (regcache);
 
       /* However, before doing so, if this single-step breakpoint was
@@ -5871,7 +5869,7 @@ handle_signal_stop (struct execution_control_state *ecs)
      inline function call sites).  */
   if (ecs->event_thread->control.step_range_end != 1)
     {
-      struct address_space *aspace = 
+      const address_space *aspace =
 	get_thread_regcache (ecs->ptid)->aspace ();
 
       /* skip_inline_frames is expensive, so we avoid it if we can
diff --git a/gdb/jit.c b/gdb/jit.c
index a2d1f6d..b70f87c 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -1186,7 +1186,6 @@ jit_frame_sniffer (const struct frame_unwind *self,
   struct jit_unwind_private *priv_data;
   struct gdb_unwind_callbacks callbacks;
   struct gdb_reader_funcs *funcs;
-  struct address_space *aspace;
   struct gdbarch *gdbarch;
 
   callbacks.reg_get = jit_unwind_reg_get_impl;
@@ -1200,7 +1199,8 @@ jit_frame_sniffer (const struct frame_unwind *self,
 
   gdb_assert (!*cache);
 
-  aspace = get_frame_address_space (this_frame);
+  const address_space *aspace = get_frame_address_space (this_frame);
+
   gdbarch = get_frame_arch (this_frame);
 
   *cache = XCNEW (struct jit_unwind_private);
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index 4b19896..20bd5d3 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -6598,7 +6598,6 @@ mips_single_step_through_delay (struct gdbarch *gdbarch,
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   CORE_ADDR pc = get_frame_pc (frame);
-  struct address_space *aspace;
   enum mips_isa isa;
   ULONGEST insn;
   int status;
@@ -6616,7 +6615,9 @@ mips_single_step_through_delay (struct gdbarch *gdbarch,
   /* _has_delay_slot above will have validated the read.  */
   insn = mips_fetch_instruction (gdbarch, isa, pc, NULL);
   size = mips_insn_size (isa, insn);
-  aspace = get_frame_address_space (frame);
+
+  const address_space *aspace = get_frame_address_space (frame);
+
   return breakpoint_here_p (aspace, pc + size) != no_breakpoint_here;
 }
 
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 67d8305..d01cff8 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -1362,7 +1362,7 @@ ppu2spu_sniffer (const struct frame_unwind *self,
 	  struct ppu2spu_cache *cache
 	    = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache);
 
-	  struct address_space *aspace = get_frame_address_space (this_frame);
+	  const address_space *aspace = get_frame_address_space (this_frame);
 	  std::unique_ptr<struct regcache> regcache
 	    (new struct regcache (data.gdbarch, aspace));
 	  regcache_save (regcache.get (), ppu2spu_unwind_register, &data);
diff --git a/gdb/record-full.c b/gdb/record-full.c
index 0488b71..6fc29d6 100644
--- a/gdb/record-full.c
+++ b/gdb/record-full.c
@@ -1098,7 +1098,6 @@ record_full_wait_1 (struct target_ops *ops,
 		  && status->value.sig == GDB_SIGNAL_TRAP)
 		{
 		  struct regcache *regcache;
-		  struct address_space *aspace;
 		  enum target_stop_reason *stop_reason_p
 		    = &record_full_stop_reason;
 
@@ -1109,7 +1108,7 @@ record_full_wait_1 (struct target_ops *ops,
 		  registers_changed ();
 		  regcache = get_current_regcache ();
 		  tmp_pc = regcache_read_pc (regcache);
-		  aspace = regcache->aspace ();
+		  const struct address_space *aspace = regcache->aspace ();
 
 		  if (target_stopped_by_watchpoint ())
 		    {
@@ -1172,7 +1171,7 @@ record_full_wait_1 (struct target_ops *ops,
     {
       struct regcache *regcache = get_current_regcache ();
       struct gdbarch *gdbarch = regcache->arch ();
-      struct address_space *aspace = regcache->aspace ();
+      const struct address_space *aspace = regcache->aspace ();
       int continue_flag = 1;
       int first_record_full_end = 1;
       struct cleanup *old_cleanups
diff --git a/gdb/regcache.c b/gdb/regcache.c
index 0bae395..ef05168 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -181,7 +181,7 @@ regcache_register_size (const struct regcache *regcache, int n)
   return register_size (regcache->arch (), n);
 }
 
-regcache::regcache (gdbarch *gdbarch, address_space *aspace_,
+regcache::regcache (gdbarch *gdbarch, const address_space *aspace_,
 		    bool readonly_p_)
   : m_aspace (aspace_), m_readonly_p (readonly_p_)
 {
diff --git a/gdb/regcache.h b/gdb/regcache.h
index 861a6d2..7eb56a7 100644
--- a/gdb/regcache.h
+++ b/gdb/regcache.h
@@ -232,7 +232,7 @@ typedef struct cached_reg
 class regcache
 {
 public:
-  regcache (gdbarch *gdbarch, address_space *aspace_)
+  regcache (gdbarch *gdbarch, const address_space *aspace_)
     : regcache (gdbarch, aspace_, true)
   {}
 
@@ -254,7 +254,7 @@ public:
   gdbarch *arch () const;
 
   /* Return REGCACHE's address space.  */
-  address_space *aspace () const
+  const address_space *aspace () const
   {
     return m_aspace;
   }
@@ -338,7 +338,7 @@ public:
 
   static void regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid);
 protected:
-  regcache (gdbarch *gdbarch, address_space *aspace_, bool readonly_p_);
+  regcache (gdbarch *gdbarch, const address_space *aspace_, bool readonly_p_);
 
   int num_raw_registers () const;
 
@@ -364,7 +364,7 @@ private:
 
   /* The address space of this register cache (for registers where it
      makes sense, like PC or SP).  */
-  struct address_space *m_aspace;
+  const address_space * const m_aspace;
 
   /* The register buffers.  A read-only register cache can hold the
      full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write