gdb:

* breakpoint.c (invalidate_bp_value_on_memory_change): Add one
	more parameter 'inferior'.
	* corefile.c (write_memory_with_notification): Caller update.

	* mi/mi-cmd-var.c: Include "mi-main.h".
	(mi_cmd_var_assign): Set mi_suppress_notification.data_write_memory
	to 1 and restore it later.
	* mi/mi-cmds.c (mi_cmd mi_cmds): Update for "data-write-memory"
	and "data-write-memory-bytes.
	* mi/mi-interp.c: Include objfiles.h.
	(mi_interpreter_init): Call observer_attach_memory_changed.
	(mi_memory_changed): New.
	* mi/mi-main.h (struct mi_suppress_notification) <memory>:
	New field.

	* NEWS: Mention new MI notification "memory-changed".

gdb/doc:

	* observer.texi (GDB Observers): Update observer
	'memory_changed'.
	* gdb.texinfo (GDB/MI Async Records): Document for
	"memory-changed" notification.

gdb/testsuite:

	* gdb.mi/mi-memory-changed.exp: New.

gdb/ChangeLog

@@ -1,3 +1,22 @@
+2012-10-17  Yao Qi  <yao@codesourcery.com>
+
+	* breakpoint.c (invalidate_bp_value_on_memory_change): Add one
+	more parameter 'inferior'.
+	* corefile.c (write_memory_with_notification): Caller update.
+
+	* mi/mi-cmd-var.c: Include "mi-main.h".
+	(mi_cmd_var_assign): Set mi_suppress_notification.data_write_memory
+	to 1 and restore it later.
+	* mi/mi-cmds.c (mi_cmd mi_cmds): Update for "data-write-memory"
+	and "data-write-memory-bytes.
+	* mi/mi-interp.c: Include objfiles.h.
+	(mi_interpreter_init): Call observer_attach_memory_changed.
+	(mi_memory_changed): New.
+	* mi/mi-main.h (struct mi_suppress_notification) <memory>:
+	New field.
+
+	* NEWS: Mention new MI notification "memory-changed".
+
 2012-10-16  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* dwarf2loc.c (dwarf_expr_reg_to_entry_parameter): Remove comment.

gdb/NEWS

@@ -62,6 +62,8 @@ py [command]
      using new async records "=tsv-created" and "=tsv-deleted".
   ** The start and stop of process record are now notified using new
      async record "=record-started" and "=record-stopped".
+  ** Memory changes are now notified using new async record
+     "=memory-changed".
 
 *** Changes in GDB 7.5
 

gdb/breakpoint.c

@@ -14718,7 +14718,8 @@ show_breakpoint_cmd (char *args, int from_tty)
    GDB itself.  */
 
 static void
-invalidate_bp_value_on_memory_change (CORE_ADDR addr, ssize_t len,
+invalidate_bp_value_on_memory_change (struct inferior *inferior,
+				      CORE_ADDR addr, ssize_t len,
 				      const bfd_byte *data)
 {
   struct breakpoint *bp;

gdb/corefile.c

@@ -369,7 +369,7 @@ write_memory_with_notification (CORE_ADDR memaddr, const bfd_byte *myaddr,
 				ssize_t len)
 {
   write_memory (memaddr, myaddr, len);
-  observer_notify_memory_changed (memaddr, len, myaddr);
+  observer_notify_memory_changed (current_inferior (), memaddr, len, myaddr);
 }
 
 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned

gdb/doc/ChangeLog

@@ -1,3 +1,10 @@
+2012-10-17  Yao Qi  <yao@codesourcery.com>
+
+	* observer.texi (GDB Observers): Update observer
+	'memory_changed'.
+	* gdb.texinfo (GDB/MI Async Records): Document for
+	"memory-changed" notification.
+
 2012-10-15  Doug Evans  <dje@google.com>
 
 	* gdb.texinfo (Mode Options): Document -nh.

gdb/doc/gdb.texinfo

@@ -27697,6 +27697,13 @@ changed to @var{value}.  In the multi-word @code{set} command,
 the @var{param} is the whole parameter list to @code{set} command.
 For example, In command @code{set check type on}, @var{param}
 is @code{check type} and @var{value} is @code{on}.
+
+@item =memory-changed,thread-group=@var{id},addr=@var{addr},len=@var{len}[,type="code"]
+Reports that bytes from @var{addr} to @var{data} + @var{len} were
+written in an inferior.  The @var{id} is the identifier of the
+thread group corresponding to the affected inferior.  The optional
+@code{type="code"} part is reported if the memory written to holds
+executable code.
 @end table
 
 @node GDB/MI Frame Information

gdb/doc/observer.texi

@@ -230,9 +230,9 @@ The inferior @var{inf} has been removed from the list of inferiors.
 This method is called immediately before freeing @var{inf}.
 @end deftypefun
 
-@deftypefun void memory_changed (CORE_ADDR @var{addr}, ssize_t @var{len}, const bfd_byte *@var{data})
+@deftypefun void memory_changed (struct inferior *@var{inferior}, CORE_ADDR @var{addr}, ssize_t @var{len}, const bfd_byte *@var{data})
 Bytes from @var{data} to @var{data} + @var{len} have been written
-to the current inferior at @var{addr}.
+to the @var{inferior} at @var{addr}.
 @end deftypefun
 
 @deftypefun void before_prompt (const char *@var{current_prompt})

gdb/mi/mi-cmd-var.c

@@ -21,6 +21,7 @@
 
 #include "defs.h"
 #include "mi-cmds.h"
+#include "mi-main.h"
 #include "ui-out.h"
 #include "mi-out.h"
 #include "varobj.h"
@@ -616,6 +617,7 @@ mi_cmd_var_assign (char *command, char **argv, int argc)
   struct ui_out *uiout = current_uiout;
   struct varobj *var;
   char *expression, *val;
+  struct cleanup *cleanup;
 
   if (argc != 2)
     error (_("-var-assign: Usage: NAME EXPRESSION."));
@@ -628,6 +630,12 @@ mi_cmd_var_assign (char *command, char **argv, int argc)
 
   expression = xstrdup (argv[1]);
 
+  /* MI command '-var-assign' may write memory, so suppress memory
+     changed notification if it does.  */
+  cleanup
+    = make_cleanup_restore_integer (&mi_suppress_notification.memory);
+  mi_suppress_notification.memory = 1;
+
   if (!varobj_set_value (var, expression))
     error (_("-var-assign: Could not assign "
 	     "expression to variable object"));
@@ -635,6 +643,8 @@ mi_cmd_var_assign (char *command, char **argv, int argc)
   val = varobj_get_value (var);
   ui_out_field_string (uiout, "value", val);
   xfree (val);
+
+  do_cleanups (cleanup);
 }
 
 /* Type used for parameters passing to mi_cmd_var_update_iter.  */

gdb/mi/mi-cmds.c

@@ -75,8 +75,10 @@ static struct mi_cmd mi_cmds[] =
   DEF_MI_CMD_MI ("data-list-register-values", mi_cmd_data_list_register_values),
   DEF_MI_CMD_MI ("data-read-memory", mi_cmd_data_read_memory),
   DEF_MI_CMD_MI ("data-read-memory-bytes", mi_cmd_data_read_memory_bytes),
-  DEF_MI_CMD_MI ("data-write-memory", mi_cmd_data_write_memory),
-  DEF_MI_CMD_MI ("data-write-memory-bytes", mi_cmd_data_write_memory_bytes),
+  DEF_MI_CMD_MI_1 ("data-write-memory", mi_cmd_data_write_memory,
+		   &mi_suppress_notification.memory),
+  DEF_MI_CMD_MI_1 ("data-write-memory-bytes", mi_cmd_data_write_memory_bytes,
+		   &mi_suppress_notification.memory),
   DEF_MI_CMD_MI ("data-write-register-values",
 		 mi_cmd_data_write_register_values),
   DEF_MI_CMD_MI ("enable-timings", mi_cmd_enable_timings),

gdb/mi/mi-interp.c

@@ -35,6 +35,7 @@
 #include "gdbthread.h"
 #include "solist.h"
 #include "gdb.h"
+#include "objfiles.h"
 
 /* These are the interpreter setup, etc. functions for the MI
    interpreter.  */
@@ -76,6 +77,8 @@ static void mi_breakpoint_created (struct breakpoint *b);
 static void mi_breakpoint_deleted (struct breakpoint *b);
 static void mi_breakpoint_modified (struct breakpoint *b);
 static void mi_command_param_changed (const char *param, const char *value);
+static void mi_memory_changed (struct inferior *inf, CORE_ADDR memaddr,
+			       ssize_t len, const bfd_byte *myaddr);
 
 static int report_initial_inferior (struct inferior *inf, void *closure);
 
@@ -138,6 +141,7 @@ mi_interpreter_init (struct interp *interp, int top_level)
       observer_attach_breakpoint_deleted (mi_breakpoint_deleted);
       observer_attach_breakpoint_modified (mi_breakpoint_modified);
       observer_attach_command_param_changed (mi_command_param_changed);
+      observer_attach_memory_changed (mi_memory_changed);
 
       /* The initial inferior is created before this function is
 	 called, so we need to report it explicitly.  Use iteration in
@@ -840,6 +844,47 @@ mi_command_param_changed (const char *param, const char *value)
   gdb_flush (mi->event_channel);
 }
 
+/* Emit notification about the target memory change.  */
+
+static void
+mi_memory_changed (struct inferior *inferior, CORE_ADDR memaddr,
+		   ssize_t len, const bfd_byte *myaddr)
+{
+  struct mi_interp *mi = top_level_interpreter_data ();
+  struct ui_out *mi_uiout = interp_ui_out (top_level_interpreter ());
+  struct obj_section *sec;
+
+  if (mi_suppress_notification.memory)
+    return;
+
+  target_terminal_ours ();
+
+  fprintf_unfiltered (mi->event_channel,
+		      "memory-changed");
+
+  ui_out_redirect (mi_uiout, mi->event_channel);
+
+  ui_out_field_fmt (mi_uiout, "thread-group", "i%d", inferior->num);
+  ui_out_field_core_addr (mi_uiout, "addr", target_gdbarch, memaddr);
+  ui_out_field_fmt (mi_uiout, "len", "0x%zx", len);
+
+  /* Append 'type=code' into notification if MEMADDR falls in the range of
+     sections contain code.  */
+  sec = find_pc_section (memaddr);
+  if (sec != NULL && sec->objfile != NULL)
+    {
+      flagword flags = bfd_get_section_flags (sec->objfile->obfd,
+					      sec->the_bfd_section);
+
+      if (flags & SEC_CODE)
+	ui_out_field_string (mi_uiout, "type", "code");
+    }
+
+  ui_out_redirect (mi_uiout, NULL);
+
+  gdb_flush (mi->event_channel);
+}
+
 static int
 report_initial_inferior (struct inferior *inf, void *closure)
 {

gdb/mi/mi-main.h

@@ -41,6 +41,8 @@ struct mi_suppress_notification
   int cmd_param_changed;
   /* Traceframe changed notification suppressed?  */
   int traceframe;
+  /* Memory changed notification suppressed?  */
+  int memory;
 };
 extern struct mi_suppress_notification mi_suppress_notification;
 

gdb/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2012-10-17  Yao Qi  <yao@codesourcery.com>
+
+	* gdb.mi/mi-memory-changed.exp: New.
+
 2012-10-16  Yao Qi  <yao@codesourcery.com>
 
 	* gdb.reverse/solib-precsave.exp: Skip if skip_shlib_test

gdb/testsuite/gdb.mi/mi-memory-changed.exp

@@ -0,0 +1,81 @@
+# Copyright 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile basics.c
+if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \
+	  executable {debug nowarnings}] != "" } {
+    untested mi-record-changed.exp
+    return -1
+}
+
+load_lib mi-support.exp
+
+if [mi_gdb_start] {
+    return
+}
+mi_gdb_reinitialize_dir $srcdir/$subdir
+mi_gdb_load ${binfile}
+
+mi_gdb_test "-break-insert -t ${srcfile}:[gdb_get_line_number "C = A + B"]" \
+    "\\^done,bkpt=\{number=\"1\".*" \
+    "insert breakpoint"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "callee4" "" ".*" ".*" {"" "disp=\"del\""} \
+    "continue to callee4"
+
+mi_gdb_test "set var C = 4" \
+    ".*=memory-changed,thread-group=\"i${decimal}\".addr=\"${hex}\",len=\"${hex}\".*\\^done" \
+    "set var C = 4"
+
+# Write memory through MI commands shouldn't trigger MI notification.
+mi_gdb_test "-var-create var_c * C" \
+    "\\^done,name=\"var_c\",numchild=\"0\",value=\"4\",type=\"int\",thread-id=\"1\",has_more=\"0\"" \
+    "create objvar for C"
+
+mi_gdb_test "-var-assign var_c 5" \
+    "-var-assign var_c 5\r\n\\^done,value=\"5\"" \
+    "change C thru. varobj"
+
+mi_gdb_test  "-data-write-memory-bytes &C \"00\"" \
+    {\^done} \
+    "change C thru. -data-write-memory-bytes"
+
+# Modify code section also triggers MI notification.
+
+# Get the instruction content of function main and its address.
+set main_addr ""
+set main_insn ""
+set test "get address of main"
+send_gdb "x/x main\n"
+gdb_expect {
+    -re ".*(${hex}) <main>:.*(${hex}).*$mi_gdb_prompt$" {
+	set main_addr $expect_out(1,string)
+	set main_insn $expect_out(2,string)
+	pass $test
+    }
+    -re ".*$mi_gdb_prompt$" {
+	fail $test
+	return
+    }
+    timeout {
+	fail "$test (timeout)"
+	return
+    }
+}
+
+mi_gdb_test "set var *(unsigned int *) ${main_addr} = ${main_insn}" \
+    ".*=memory-changed,thread-group=\"i${decimal}\".addr=\"${main_addr}\",len=\"0x4\",type=\"code\".*\\^done"
+mi_gdb_exit
+return 0