gdb ChangeLog

* gdbtypes.h (builtin_type): Add builtin_char16 and builtin_char32
	fields.
	* gdbtypes.c (gdbtypes_post_init): Set builtin_char16 and
	builtin_char32 fields.
	* printcmd.c (decode_format): Set char size to '\0'
	for strings unless explicit size is given.
	(print_formatted): Correct calculation of NEXT_ADDRESS
	for 16 or 32 bit strings.
	(do_examine): Do not force byte size for strings.
	Use builtin_char16 and builtin_char32 types to display
	16 or 32 bit-wide strings.
	(x_command): Set LAST_SIZE to 'b' for string type.

gdb/doc ChangeLog

      * gdb.texinfo (Examining memory): Update for
	change in string display with explicit size.

gdb/testsuite ChangeLog

	* gdb.base/charset.c (Strin16, String32): New variables.
	* gdb.base/charset.exp (gdb_test): Test correct display
	of 16 or 32 bit strings.

gdb/ChangeLog

@@ -1,3 +1,18 @@
+2010-04-22  Pierre Muller  <muller@ics.u-strasbg.fr>
+
+	* gdbtypes.h (builtin_type): Add builtin_char16 and builtin_char32
+	fields.
+	* gdbtypes.c (gdbtypes_post_init): Set builtin_char16 and 
+	builtin_char32 fields.
+	* printcmd.c (decode_format): Set char size to '\0'
+	for strings unless explicit size is given.
+	(print_formatted): Correct calculation of NEXT_ADDRESS
+	for 16 or 32 bit strings.
+	(do_examine): Do not force byte size for strings.
+	Use builtin_char16 and builtin_char32 types to display
+	16 or 32 bit-wide strings. 
+	(x_command): Set LAST_SIZE to 'b' for string type.
+
 2010-04-21  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR corefiles/11523

gdb/doc/ChangeLog

@@ -1,3 +1,8 @@
+2010-04-22  Pierre Muller  <muller@ics.u-strasbg.fr>
+
+	* gdb.texinfo (Examining memory): Update for change in string
+	display with explicit size.
+
 2010-04-19  Pedro Alves  <pedro@codesourcery.com>
 
 	PR breakpoints/8554.

gdb/doc/gdb.texinfo

@@ -7262,8 +7262,16 @@ Giant words (eight bytes).
 @end table
 
 Each time you specify a unit size with @code{x}, that size becomes the
-default unit the next time you use @code{x}.  (For the @samp{s} and
-@samp{i} formats, the unit size is ignored and is normally not written.)
+default unit the next time you use @code{x}.  For the @samp{i} format,
+the unit size is ignored and is normally not written.  For the @samp{s} format,
+the unit size defaults to @samp{b}, unless it is explicitly given.
+Use @kbd{x /hs} to display 16-bit char strings and @kbd{x /ws} to display
+32-bit strings.  The next use of @kbd{x /s} will again display 8-bit strings.
+Note that the results depend on the programming language of the
+current compilation unit.  If the language is C, the @samp{s}
+modifier will use the UTF-16 encoding while @samp{w} will use
+UTF-32.  The encoding is set by the programming language and cannot
+be altered.
 
 @item @var{addr}, starting display address
 @var{addr} is the address where you want @value{GDBN} to begin displaying

gdb/gdbtypes.c

@@ -3474,6 +3474,13 @@ gdbtypes_post_init (struct gdbarch *gdbarch)
   TYPE_NOTTEXT (builtin_type->builtin_int8) = 1;
   TYPE_NOTTEXT (builtin_type->builtin_uint8) = 1;
 
+  /* Wide character types.  */
+  builtin_type->builtin_char16
+    = arch_integer_type (gdbarch, 16, 0, "char16_t");
+  builtin_type->builtin_char32
+    = arch_integer_type (gdbarch, 32, 0, "char32_t");
+	
+
   /* Default data/code pointer types.  */
   builtin_type->builtin_data_ptr
     = lookup_pointer_type (builtin_type->builtin_void);

gdb/gdbtypes.h

@@ -1099,6 +1099,9 @@ struct builtin_type
   struct type *builtin_int128;
   struct type *builtin_uint128;
 
+  /* Wide character types.  */
+  struct type *builtin_char16;
+  struct type *builtin_char32;
 
   /* Pointer types.  */
 

gdb/printcmd.c

@@ -260,6 +260,11 @@ decode_format (char **string_ptr, int oformat, int osize)
 	/* Characters default to one byte.  */
 	val.size = osize ? 'b' : osize;
 	break;
+      case 's':
+	/* Display strings with byte size chars unless explicitly specified.  */
+	val.size = '\0';
+	break;
+
       default:
 	/* The default is the size most recently specified.  */
 	val.size = osize;
@@ -295,7 +300,7 @@ print_formatted (struct value *val, int size,
 	    next_address = (value_address (val)
 			    + val_print_string (elttype,
 						value_address (val), -1,
-						stream, options));
+						stream, options) * len);
 	  }
 	  return;
 
@@ -802,9 +807,11 @@ do_examine (struct format_data fmt, struct gdbarch *gdbarch, CORE_ADDR addr)
   next_gdbarch = gdbarch;
   next_address = addr;
 
-  /* String or instruction format implies fetch single bytes
-     regardless of the specified size.  */
-  if (format == 's' || format == 'i')
+  /* Instruction format implies fetch single bytes
+     regardless of the specified size.
+     The case of strings is handled in decode_format, only explicit
+     size operator are not changed to 'b'.  */
+  if (format == 'i')
     size = 'b';
 
   if (size == 'a')
@@ -831,6 +838,27 @@ do_examine (struct format_data fmt, struct gdbarch *gdbarch, CORE_ADDR addr)
   else if (size == 'g')
     val_type = builtin_type (next_gdbarch)->builtin_int64;
 
+  if (format == 's')
+    {
+      struct type *char_type = NULL;
+      /* Search for "char16_t"  or "char32_t" types or fall back to 8-bit char
+	 if type is not found.  */
+      if (size == 'h')
+	char_type = builtin_type (next_gdbarch)->builtin_char16;
+      else if (size == 'w')
+	char_type = builtin_type (next_gdbarch)->builtin_char32;
+      if (char_type)
+        val_type = char_type;
+      else
+        {
+	  if (size != '\0' && size != 'b')
+	    warning (_("Unable to display strings with size '%c', using 'b' \
+instead."), size);
+	  size = 'b';
+	  val_type = builtin_type (next_gdbarch)->builtin_int8;
+        }
+    }
+
   maxelts = 8;
   if (size == 'w')
     maxelts = 4;
@@ -1413,8 +1441,11 @@ x_command (char *exp, int from_tty)
   do_examine (fmt, next_gdbarch, next_address);
 
   /* If the examine succeeds, we remember its size and format for next
-     time.  */
-  last_size = fmt.size;
+     time.  Set last_size to 'b' for strings.  */
+  if (fmt.format == 's')
+    last_size = 'b';
+  else
+    last_size = fmt.size;
   last_format = fmt.format;
 
   /* Set a couple of internal variables if appropriate. */

gdb/testsuite/ChangeLog

@@ -1,4 +1,10 @@
-Wed Apr 21 12:47:26 2010  Chris Moller  <cmoller@redhat.com>
+2010-04-22  Pierre Muller  <muller@ics.u-strasbg.fr>
+
+	* gdb.base/charset.c (Strin16, String32): New variables.
+	* gdb.base/charset.exp (gdb_test): Test correct display
+	of 16 or 32 bit strings.
+
+2010-04-21  Chris Moller  <cmoller@redhat.com>
 
 	PR 9167
 	* gdb.cp/Makefile.in (EXECUTABLES): Added pr9167.

gdb/testsuite/gdb.base/charset.c

@@ -65,6 +65,9 @@ typedef unsigned int char32_t;
 char16_t uvar;
 char32_t Uvar;
 
+char16_t *String16;
+char32_t *String32;
+
 /* A typedef to a typedef should also work.  */
 typedef wchar_t my_wchar_t;
 my_wchar_t myvar;

gdb/testsuite/gdb.base/charset.exp

@@ -616,4 +616,21 @@ gdb_test "print 'a' == 'a' || 'b' == 'b'" \
   ".* = 1" \
   "EVAL_SKIP cleanup handling regression test"
 
+
+proc string_display { var_name set_prefix x_size x_type} {
+  gdb_test "set ${var_name} = ${set_prefix}\"Test String\\0with zeroes\"" "" "Assign ${var_name} with prefix ${set_prefix}"
+  gdb_test "x /2${x_size}s ${var_name}" ".* ${x_type}\"Test String\"\[\r\n\]+.* ${x_type}\"with zeroes\"" "Display String ${var_name} with x/${x_size}s"
+}
+
+string_display String16 u h u
+if {$wchar_size == 2} {
+  string_display String16 L h u
+}
+ 
+string_display String32 U w U
+if {$wchar_size == 4} {
+  string_display String32 L w U
+}
+
+
 gdb_exit