Re: MI solib notification

[Vladimir Prus <vladimir@codesourcery.com>]

[-- Attachment #1: Type: text/plain, Size: 1022 bytes --]

On Thursday 12 February 2009 23:17:44 Daniel Jacobowitz wrote:
> On Thu, Feb 12, 2009 at 11:11:04PM +0300, Vladimir Prus wrote:
> > Can you write down the comment that disable_breakpoints_in_unloaded_shlib
> > would have to contain to explain all this? ;-) I assume it will go like this:
> > 
> > 	Don't emit any message here for a.out, because for all the other
> > 	targets some other code calls some other function that arranges for
> > 	this message to not be printed when rerunning the program...
> > 
> > In other words, the problem with checking for a.out is that it deeply depends on
> > intricate details of some other code.
> 
> It's not about the message, but about the disabling.  I mean:
> 
>   /* SunOS a.out shared libraries are always mapped, so do not
>      disable breakpoints; they will only be reported as unloaded
>      through clear_solib when GDB discards its shared library
>      list.  See clear_solib for more information.  */

For avoidance of doubt, is the attached OK code-wize?

- Volodya

[-- Attachment #2: solib_notifications.diff --]
[-- Type: text/x-diff, Size: 8601 bytes --]

commit 266230fb5ea8f192ec5725d23716ff2949a13ce0
Author: Vladimir Prus <vladimir@codesourcery.com>
Date:   Fri Jan 30 20:50:50 2009 +0300

    Implement MI notification for library loading/unloading
    
    	gdb/doc/
    	* gdb.texinfo (GDB/MI Async Records): Document the
    	=library-loaded and =library-unloaded notifications.
    
    	gdb/
    	* mi/mi-interp.c (mi_solib_loaded, mi_solib_unloaded): New.
    	(mi_interpreter_init): Register the above.
    	* solib.c (clear_solib): Notify solib unload.
    	* breakpoint.c (disable_breakpoints_in_unloaded_shlib): Do not
    	disable breakpoints on a.out targets.
    
    	gdb/testsuite/
    	* gdb.mi/mi-nonstop.exp (notifs): Adjust for library notifications.
    	* gdb.mi/mi-nsintrall.exp (notifs): Likewise.
    	* gdb.mi/mi-nsmoribund.exp (notifs): Likewise.
    	* lib/mi-support.exp (library_loaded_re): New.
    	(mi_run_cmd, mi_send_resuming_command_raw): Adjust.

diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 0caedec..9b48f24 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -4457,6 +4457,13 @@ disable_breakpoints_in_unloaded_shlib (struct so_list *solib)
   struct bp_location *loc;
   int disabled_shlib_breaks = 0;
 
+  /* We should not disable breakpoints on a.out targets.
+     See comment on solib.c:clear_solib for a detailed
+     explanation.  */
+  if (exec_bfd != NULL
+      && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour)
+    return;
+
   ALL_BP_LOCATIONS (loc)
   {
     struct breakpoint *b = loc->owner;
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 6aad520..805b834 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -19912,6 +19912,15 @@ We suggest that in response to this notification, front ends
 highlight the selected thread and cause subsequent commands to apply to
 that thread.
 
+@item =library-loaded,id="@var{id}",target-name="@var{target-name}",host-name="@var{host-name}",low-address="@var{low}",high-address="@var{high}",symbols-loaded="@var{loaded}"
+Reports that a new library file was loaded by the program.  The
+@var{id} field is an opaque identifier of the library. For remote
+debugging case, @var{target-name} and @var{host-name} fields give the 
+name of the library file on the target, and on the host respectively.
+
+@item =library-unloaded,id="@var{id}",target-name="@var{target-name}",host-name="@var{host-name}"
+Reports that a library was loaded by the program.
+
 @end table
 
 @node GDB/MI Frame Information
diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index 95dfdf4..d32638c 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -34,6 +34,7 @@
 #include "mi-common.h"
 #include "observer.h"
 #include "gdbthread.h"
+#include "solist.h"
 
 /* These are the interpreter setup, etc. functions for the MI interpreter */
 static void mi_execute_command_wrapper (char *cmd);
@@ -58,6 +59,8 @@ static void mi_thread_exit (struct thread_info *t);
 static void mi_new_inferior (int pid);
 static void mi_inferior_exit (int pid);
 static void mi_on_resume (ptid_t ptid);
+static void mi_solib_loaded (struct so_list *solib);
+static void mi_solib_unloaded (struct so_list *solib);
 
 static void *
 mi_interpreter_init (int top_level)
@@ -86,6 +89,8 @@ mi_interpreter_init (int top_level)
       observer_attach_inferior_exit (mi_inferior_exit);
       observer_attach_normal_stop (mi_on_normal_stop);
       observer_attach_target_resumed (mi_on_resume);
+      observer_attach_solib_loaded (mi_solib_loaded);
+      observer_attach_solib_unloaded (mi_solib_unloaded);
     }
 
   return mi;
@@ -408,6 +413,31 @@ mi_on_resume (ptid_t ptid)
   gdb_flush (raw_stdout);
 }
 
+static void mi_solib_loaded (struct so_list *solib)
+{
+  struct mi_interp *mi = top_level_interpreter_data ();
+  target_terminal_ours ();
+  fprintf_unfiltered (mi->event_channel, 
+		      "library-loaded,id=\"%s\",target-name=\"%s\",host-name=\"%s\",low-address=\"0x%s\",high-address=\"0x%s\",symbols-loaded=\"%d\"", 
+		      solib->so_original_name, solib->so_original_name, 
+		      solib->so_name, 
+		      paddr (solib->addr_low), paddr (solib->addr_high), 
+		      solib->symbols_loaded);
+  gdb_flush (mi->event_channel);
+}
+
+static void mi_solib_unloaded (struct so_list *solib)
+{
+  struct mi_interp *mi = top_level_interpreter_data ();
+  target_terminal_ours ();
+  fprintf_unfiltered (mi->event_channel, 
+		      "library-unloaded,id=\"%s\",target-name=\"%s\",host-name=\"%s\"", 
+		      solib->so_original_name, solib->so_original_name, 
+		      solib->so_name);
+  gdb_flush (mi->event_channel);
+}
+
+
 extern initialize_file_ftype _initialize_mi_interp; /* -Wmissing-prototypes */
 
 void
diff --git a/gdb/solib.c b/gdb/solib.c
index cce4f7f..5a28292 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -908,6 +908,7 @@ clear_solib (void)
     {
       struct so_list *so = so_list_head;
       so_list_head = so->next;
+      observer_notify_solib_unloaded (so);
       if (so->abfd)
 	remove_target_sections (so->abfd);
       free_so (so);
diff --git a/gdb/testsuite/gdb.mi/mi-nonstop.exp b/gdb/testsuite/gdb.mi/mi-nonstop.exp
index 2521ae5..08952b0 100644
--- a/gdb/testsuite/gdb.mi/mi-nonstop.exp
+++ b/gdb/testsuite/gdb.mi/mi-nonstop.exp
@@ -63,7 +63,7 @@ mi_gdb_test "200-break-insert -t main" ".*"
 set created "=thread-created,id=\"$decimal\"\r\n"
 set running "\\*running,thread-id=\"$decimal\"\r\n"
 
-set notifs "($created)*($running)*"
+set notifs "($created)*($running)*($library_loaded_re)*"
 
 # Note: presently, we skip this test on non-native targets,
 # so 'run' is OK.  As soon as we start to run this on remote
diff --git a/gdb/testsuite/gdb.mi/mi-nsintrall.exp b/gdb/testsuite/gdb.mi/mi-nsintrall.exp
index b0d7b71..d34b08d 100644
--- a/gdb/testsuite/gdb.mi/mi-nsintrall.exp
+++ b/gdb/testsuite/gdb.mi/mi-nsintrall.exp
@@ -62,7 +62,7 @@ mi_gdb_test "200-break-insert -t main" ".*"
 set created "=thread-created,id=\"$decimal\"\r\n"
 set running "\\*running,thread-id=\"$decimal\"\r\n"
 
-set notifs "($created)*($running)*"
+set notifs "($created)*($running)*($library_loaded_re)*"
 
 # Note: presently, we skip this test on non-native targets,
 # so 'run' is OK.  As soon as we start to run this on remote
diff --git a/gdb/testsuite/gdb.mi/mi-nsmoribund.exp b/gdb/testsuite/gdb.mi/mi-nsmoribund.exp
index b836c5b..505fc84 100644
--- a/gdb/testsuite/gdb.mi/mi-nsmoribund.exp
+++ b/gdb/testsuite/gdb.mi/mi-nsmoribund.exp
@@ -62,7 +62,7 @@ mi_gdb_test "200-break-insert -t main" ".*"
 set created "=thread-created,id=\"$decimal\"\r\n"
 set running "\\*running,thread-id=\"$decimal\"\r\n"
 
-set notifs "($created)*($running)*"
+set notifs "($created)*($running)*($library_loaded_re)*"
 
 # Note: presently, we skip this test on non-native targets,
 # so 'run' is OK.  As soon as we start to run this on remote
diff --git a/gdb/testsuite/lib/mi-support.exp b/gdb/testsuite/lib/mi-support.exp
index a2aa629..f62c240 100644
--- a/gdb/testsuite/lib/mi-support.exp
+++ b/gdb/testsuite/lib/mi-support.exp
@@ -31,6 +31,7 @@ global mi_inferior_tty_name
 set MIFLAGS "-i=mi"
 
 set thread_selected_re "=thread-selected,id=\"\[0-9+\]\"\r\n"
+set library_loaded_re "=library-loaded\[^\n\]+\"\r\n"
 
 #
 # mi_gdb_exit -- exit the GDB, killing the target program if necessary
@@ -778,6 +779,7 @@ proc mi_run_cmd {args} {
     }
     global mi_gdb_prompt
     global thread_selected_re
+    global library_loaded_re
 
     if [target_info exists gdb_init_command] {
 	send_gdb "[target_info gdb_init_command]\n";
@@ -819,7 +821,7 @@ proc mi_run_cmd {args} {
 
     send_gdb "220-exec-run $args\n"
     gdb_expect {
-	-re "220\\^running\r\n(\\*running,thread-id=\"\[^\"\]+\"\r\n|=thread-created,id=\"1\",group-id=\"\[0-9\]+\"\r\n)*(${thread_selected_re})?${mi_gdb_prompt}" {
+	-re "220\\^running\r\n(\\*running,thread-id=\"\[^\"\]+\"\r\n|=thread-created,id=\"1\",group-id=\"\[0-9\]+\"\r\n)*(${library_loaded_re})*(${thread_selected_re})?${mi_gdb_prompt}" {
 	}
 	timeout {
 	    perror "Unable to start target"
@@ -1435,10 +1437,11 @@ proc mi_send_resuming_command_raw {command test} {
 
     global mi_gdb_prompt
     global thread_selected_re
+    global library_loaded_re
 
     send_gdb "$command\n"
     gdb_expect {
-        -re "\\^running\r\n\\*running,thread-id=\"\[^\"\]+\"\r\n($thread_selected_re)?${mi_gdb_prompt}" {
+        -re "\\^running\r\n\\*running,thread-id=\"\[^\"\]+\"\r\n($library_loaded_re)*($thread_selected_re)?${mi_gdb_prompt}" {
             # Note that lack of 'pass' call here -- this works around limitation
             # in DejaGNU xfail mechanism. mi-until.exp has this:
             #