gdb: make some breakpoint methods use `this`

Some implementations of breakpoint::check_status and
breakpoint::print_it do this:

    struct breakpoint *b = bs->breakpoint_at;

bs->breakpoint_at is always the same as `this` (we can get convinced by
looking at the call sites of check_status and print_it), so it would
just be clearer to access fields through `this` instead.

Change-Id: Ic542a64fcd88e31ae2aad6feff1da278c7086891
Reviewed-By: Alexandra Petlanova Hajkova <ahajkova@redhat.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>

4 files changed, 19 insertions, 29 deletions

diff --git a/gdb/break-catch-load.c b/gdb/break-catch-load.c
index d8dab0b..e01f645 100644
--- a/gdb/break-catch-load.c
+++ b/gdb/break-catch-load.c
@@ -141,19 +141,18 @@ solib_catchpoint::check_status (struct bpstat *bs)
 enum print_stop_action
 solib_catchpoint::print_it (const bpstat *bs) const
 {
-  struct breakpoint *b = bs->breakpoint_at;
   struct ui_out *uiout = current_uiout;
 
-  annotate_catchpoint (b->number);
+  annotate_catchpoint (this->number);
   maybe_print_thread_hit_breakpoint (uiout);
-  if (b->disposition == disp_del)
+  if (this->disposition == disp_del)
     uiout->text ("Temporary catchpoint ");
   else
     uiout->text ("Catchpoint ");
-  uiout->field_signed ("bkptno", b->number);
+  uiout->field_signed ("bkptno", this->number);
   uiout->text ("\n");
   if (uiout->is_mi_like_p ())
-    uiout->field_string ("disp", bpdisp_text (b->disposition));
+    uiout->field_string ("disp", bpdisp_text (this->disposition));
   print_solib_event (true);
   return PRINT_SRC_AND_LOC;
 }
diff --git a/gdb/break-catch-syscall.c b/gdb/break-catch-syscall.c
index 595b05c..6475f4a 100644
--- a/gdb/break-catch-syscall.c
+++ b/gdb/break-catch-syscall.c
@@ -190,7 +190,6 @@ enum print_stop_action
 syscall_catchpoint::print_it (const bpstat *bs) const
 {
   struct ui_out *uiout = current_uiout;
-  struct breakpoint *b = bs->breakpoint_at;
   /* These are needed because we want to know in which state a
      syscall is.  It can be in the TARGET_WAITKIND_SYSCALL_ENTRY
      or TARGET_WAITKIND_SYSCALL_RETURN, and depending on it we
@@ -202,10 +201,10 @@ syscall_catchpoint::print_it (const bpstat *bs) const
 
   get_syscall_by_number (gdbarch, last.syscall_number (), &s);
 
-  annotate_catchpoint (b->number);
+  annotate_catchpoint (this->number);
   maybe_print_thread_hit_breakpoint (uiout);
 
-  if (b->disposition == disp_del)
+  if (this->disposition == disp_del)
     uiout->text ("Temporary catchpoint ");
   else
     uiout->text ("Catchpoint ");
@@ -215,7 +214,7 @@ syscall_catchpoint::print_it (const bpstat *bs) const
 			   async_reason_lookup (last.kind () == TARGET_WAITKIND_SYSCALL_ENTRY
 						? EXEC_ASYNC_SYSCALL_ENTRY
 						: EXEC_ASYNC_SYSCALL_RETURN));
-      uiout->field_string ("disp", bpdisp_text (b->disposition));
+      uiout->field_string ("disp", bpdisp_text (this->disposition));
     }
   print_num_locno (bs, uiout);
 
diff --git a/gdb/break-catch-throw.c b/gdb/break-catch-throw.c
index 457446e..604c185 100644
--- a/gdb/break-catch-throw.c
+++ b/gdb/break-catch-throw.c
@@ -160,15 +160,13 @@ fetch_probe_arguments (struct value **arg0, struct value **arg1)
 void
 exception_catchpoint::check_status (struct bpstat *bs)
 {
-  struct exception_catchpoint *self
-    = (struct exception_catchpoint *) bs->breakpoint_at;
   std::string type_name;
 
   this->breakpoint::check_status (bs);
   if (!bs->stop)
     return;
 
-  if (self->pattern == NULL)
+  if (this->pattern == NULL)
     return;
 
   const char *name = nullptr;
@@ -192,7 +190,7 @@ exception_catchpoint::check_status (struct bpstat *bs)
 
   if (name != nullptr)
     {
-      if (self->pattern->exec (name, 0, NULL, 0) != 0)
+      if (this->pattern->exec (name, 0, NULL, 0) != 0)
 	bs->stop = false;
     }
 }
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 36e53c0..facf23c 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -9701,8 +9701,6 @@ watchpoint::breakpoint_hit (const struct bp_location *bl,
 void
 watchpoint::check_status (bpstat *bs)
 {
-  gdb_assert (is_watchpoint (bs->breakpoint_at));
-
   bpstat_check_watchpoint (bs);
 }
 
@@ -9730,28 +9728,25 @@ watchpoint::works_in_software_mode () const
 enum print_stop_action
 watchpoint::print_it (const bpstat *bs) const
 {
-  struct breakpoint *b;
   enum print_stop_action result;
   struct ui_out *uiout = current_uiout;
 
   gdb_assert (bs->bp_location_at != NULL);
 
-  b = bs->breakpoint_at;
-
-  annotate_watchpoint (b->number);
+  annotate_watchpoint (this->number);
   maybe_print_thread_hit_breakpoint (uiout);
 
   string_file stb;
 
   gdb::optional<ui_out_emit_tuple> tuple_emitter;
-  switch (b->type)
+  switch (this->type)
     {
     case bp_watchpoint:
     case bp_hardware_watchpoint:
       if (uiout->is_mi_like_p ())
 	uiout->field_string
 	  ("reason", async_reason_lookup (EXEC_ASYNC_WATCHPOINT_TRIGGER));
-      mention (b);
+      mention (this);
       tuple_emitter.emplace (uiout, "value");
       uiout->text ("\nOld value = ");
       watchpoint_value_print (bs->old_val.get (), &stb);
@@ -9768,7 +9763,7 @@ watchpoint::print_it (const bpstat *bs) const
       if (uiout->is_mi_like_p ())
 	uiout->field_string
 	  ("reason", async_reason_lookup (EXEC_ASYNC_READ_WATCHPOINT_TRIGGER));
-      mention (b);
+      mention (this);
       tuple_emitter.emplace (uiout, "value");
       uiout->text ("\nValue = ");
       watchpoint_value_print (val.get (), &stb);
@@ -9784,7 +9779,7 @@ watchpoint::print_it (const bpstat *bs) const
 	    uiout->field_string
 	      ("reason",
 	       async_reason_lookup (EXEC_ASYNC_ACCESS_WATCHPOINT_TRIGGER));
-	  mention (b);
+	  mention (this);
 	  tuple_emitter.emplace (uiout, "value");
 	  uiout->text ("\nOld value = ");
 	  watchpoint_value_print (bs->old_val.get (), &stb);
@@ -9793,7 +9788,7 @@ watchpoint::print_it (const bpstat *bs) const
 	}
       else
 	{
-	  mention (b);
+	  mention (this);
 	  if (uiout->is_mi_like_p ())
 	    uiout->field_string
 	      ("reason",
@@ -9945,16 +9940,15 @@ masked_watchpoint::works_in_software_mode () const
 enum print_stop_action
 masked_watchpoint::print_it (const bpstat *bs) const
 {
-  struct breakpoint *b = bs->breakpoint_at;
   struct ui_out *uiout = current_uiout;
 
   /* Masked watchpoints have only one location.  */
-  gdb_assert (b->loc && b->loc->next == NULL);
+  gdb_assert (this->loc && this->loc->next == nullptr);
 
-  annotate_watchpoint (b->number);
+  annotate_watchpoint (this->number);
   maybe_print_thread_hit_breakpoint (uiout);
 
-  switch (b->type)
+  switch (this->type)
     {
     case bp_hardware_watchpoint:
       if (uiout->is_mi_like_p ())
@@ -9978,7 +9972,7 @@ masked_watchpoint::print_it (const bpstat *bs) const
       internal_error (_("Invalid hardware watchpoint type."));
     }
 
-  mention (b);
+  mention (this);
   uiout->text (_("\n\
 Check the underlying instruction at PC for the memory\n\
 address and value which triggered this watchpoint.\n"));