[PATCH v4 1/4] gdbserver: Rephrase loops in regsets_fetch/store_inferior_registers

[Andreas Arnez]

Replace the while-loops in linux-low.c that iterate over regsets by
for-loops.  This makes it clearer what is iterated over.  Also, since
"continue" now moves on to the next iteration without having to
increment the regset pointer first, the code is slightly reduced.

In case of EIO the old code did not increment the regset pointer, but
iterated over the same (now disabled) regset again.  This extra
iteration is now avoided.

gdb/gdbserver/ChangeLog:

	* linux-low.c (regsets_fetch_inferior_registers): Rephrase
	while-loop as for-loop.
	(regsets_store_inferior_registers): Likewise.
---
 gdb/gdbserver/linux-low.c | 22 ++++------------------
 1 file changed, 4 insertions(+), 18 deletions(-)

diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 01f11b7..164b0f6 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -4221,19 +4221,14 @@ regsets_fetch_inferior_registers (struct regsets_info *regsets_info,
   int pid;
   struct iovec iov;
 
-  regset = regsets_info->regsets;
-
   pid = lwpid_of (current_thread);
-  while (regset->size >= 0)
+  for (regset = regsets_info->regsets; regset->size >= 0; regset++)
     {
       void *buf, *data;
       int nt_type, res;
 
       if (regset->size == 0 || regset_disabled (regsets_info, regset))
-	{
-	  regset ++;
-	  continue;
-	}
+	continue;
 
       buf = xmalloc (regset->size);
 
@@ -4274,7 +4269,6 @@ regsets_fetch_inferior_registers (struct regsets_info *regsets_info,
       else if (regset->type == GENERAL_REGS)
 	saw_general_regs = 1;
       regset->store_function (regcache, buf);
-      regset ++;
       free (buf);
     }
   if (saw_general_regs)
@@ -4292,19 +4286,14 @@ regsets_store_inferior_registers (struct regsets_info *regsets_info,
   int pid;
   struct iovec iov;
 
-  regset = regsets_info->regsets;
-
   pid = lwpid_of (current_thread);
-  while (regset->size >= 0)
+  for (regset = regsets_info->regsets; regset->size >= 0; regset++)
     {
       void *buf, *data;
       int nt_type, res;
 
       if (regset->size == 0 || regset_disabled (regsets_info, regset))
-	{
-	  regset ++;
-	  continue;
-	}
+	continue;
 
       buf = xmalloc (regset->size);
 
@@ -4350,8 +4339,6 @@ regsets_store_inferior_registers (struct regsets_info *regsets_info,
 	      /* If we get EIO on a regset, do not try it again for
 		 this process mode.  */
 	      disable_regset (regsets_info, regset);
-	      free (buf);
-	      continue;
 	    }
 	  else if (errno == ESRCH)
 	    {
@@ -4369,7 +4356,6 @@ regsets_store_inferior_registers (struct regsets_info *regsets_info,
 	}
       else if (regset->type == GENERAL_REGS)
 	saw_general_regs = 1;
-      regset ++;
       free (buf);
     }
   if (saw_general_regs)
-- 
1.8.4.2