gdb: move displaced_step_dump_bytes into gdbsupport (and rename)

It was pointed out during review of another patch that the function
displaced_step_dump_bytes really isn't specific to displaced stepping,
and should really get a more generic name and move into gdbsupport/.

This commit does just that.  The function is renamed to
bytes_to_string and is moved into gdbsupport/common-utils.{cc,h}.  The
function implementation doesn't really change. Much...

... I have updated the function to take an array view, which makes it
slightly easier to call in a couple of places where we already have a
gdb::bytes_vector.  I've then added an inline wrapper to convert a raw
pointer and length into an array view, which is used in places where
we don't easily have a gdb::bytes_vector (or similar).

Updated all users of displaced_step_dump_bytes.

There should be no user visible changes after this commit.

Finally, I ended up having to add an include of gdb_assert.h into
array-view.h.  When I include array-view.h into common-utils.h I ran
into build problems because array-view.h calls gdb_assert.

Approved-By: Simon Marchi <simon.marchi@efficios.com>

7 files changed, 7 insertions, 31 deletions

diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 81665e5..228b751 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -1526,7 +1526,7 @@ amd64_displaced_step_copy_insn (struct gdbarch *gdbarch,
 
   displaced_debug_printf ("copy %s->%s: %s",
 			  paddress (gdbarch, from), paddress (gdbarch, to),
-			  displaced_step_dump_bytes (buf, len).c_str ());
+			  bytes_to_string (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
   return displaced_step_copy_insn_closure_up (dsc.release ());
diff --git a/gdb/displaced-stepping.c b/gdb/displaced-stepping.c
index 3fefdf3..c268884 100644
--- a/gdb/displaced-stepping.c
+++ b/gdb/displaced-stepping.c
@@ -122,8 +122,7 @@ displaced_step_buffers::prepare (thread_info *thread, CORE_ADDR &displaced_pc)
 
   displaced_debug_printf ("saved %s: %s",
 			  paddress (arch, buffer->addr),
-			  displaced_step_dump_bytes
-			  (buffer->saved_copy.data (), len).c_str ());
+			  bytes_to_string (buffer->saved_copy).c_str ());
 
   /* Save this in a local variable first, so it's released if code below
      throws.  */
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 96c04c1..e93479c 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -830,7 +830,7 @@ i386_displaced_step_copy_insn (struct gdbarch *gdbarch,
 
   displaced_debug_printf ("%s->%s: %s",
 			  paddress (gdbarch, from), paddress (gdbarch, to),
-			  displaced_step_dump_bytes (buf, len).c_str ());
+			  bytes_to_string (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
   return displaced_step_copy_insn_closure_up (closure.release ());
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 5ccdc0c..8a8439f 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1725,24 +1725,6 @@ displaced_step_reset (displaced_step_thread_state *displaced)
 
 using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset);
 
-/* See infrun.h.  */
-
-std::string
-displaced_step_dump_bytes (const gdb_byte *buf, size_t len)
-{
-  std::string ret;
-
-  for (size_t i = 0; i < len; i++)
-    {
-      if (i == 0)
-	ret += string_printf ("%02x", buf[i]);
-      else
-	ret += string_printf (" %02x", buf[i]);
-    }
-
-  return ret;
-}
-
 /* Prepare to single-step, using displaced stepping.
 
    Note that we cannot use displaced stepping when we have a signal to
@@ -1820,8 +1802,7 @@ displaced_step_prepare_throw (thread_info *tp)
 	  gdb::byte_vector insn_buf (dislen);
 	  read_memory (original_pc, insn_buf.data (), insn_buf.size ());
 
-	  std::string insn_bytes
-	    = displaced_step_dump_bytes (insn_buf.data (), insn_buf.size ());
+	  std::string insn_bytes = bytes_to_string (insn_buf);
 
 	  displaced_debug_printf ("original insn %s: %s \t %s",
 				  paddress (gdbarch, original_pc),
@@ -1902,8 +1883,7 @@ displaced_step_prepare_throw (thread_info *tp)
 	  gdb::byte_vector insn_buf (dislen);
 	  read_memory (addr, insn_buf.data (), insn_buf.size ());
 
-	  std::string insn_bytes
-	    = displaced_step_dump_bytes (insn_buf.data (), insn_buf.size ());
+	  std::string insn_bytes = bytes_to_string (insn_buf);
 	  std::string insn_str = tmp_stream.release ();
 	  displaced_debug_printf ("replacement insn %s: %s \t %s",
 				  paddress (gdbarch, addr),
diff --git a/gdb/infrun.h b/gdb/infrun.h
index 5219063..9b3c896 100644
--- a/gdb/infrun.h
+++ b/gdb/infrun.h
@@ -270,9 +270,6 @@ extern void update_signals_program_target (void);
    $_exitsignal.  */
 extern void clear_exit_convenience_vars (void);
 
-/* Dump LEN bytes at BUF in hex to a string and return it.  */
-extern std::string displaced_step_dump_bytes (const gdb_byte *buf, size_t len);
-
 extern void update_observer_mode (void);
 
 extern void signal_catch_update (const unsigned int *);
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 8b40004..b071f38 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -940,7 +940,7 @@ ppc_displaced_step_copy_insn (struct gdbarch *gdbarch,
 
   displaced_debug_printf ("copy %s->%s: %s",
 			  paddress (gdbarch, from), paddress (gdbarch, to),
-			  displaced_step_dump_bytes (buf, len).c_str ());
+			  bytes_to_string (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
   return displaced_step_copy_insn_closure_up (closure.release ());
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index cab1757..081a8b6 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -469,7 +469,7 @@ s390_displaced_step_copy_insn (struct gdbarch *gdbarch,
 
   displaced_debug_printf ("copy %s->%s: %s",
 			  paddress (gdbarch, from), paddress (gdbarch, to),
-			  displaced_step_dump_bytes (buf, len).c_str ());
+			  bytes_to_string (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
   return displaced_step_copy_insn_closure_up (closure.release ());