Eliminate enum bpstat_signal_value, simplify random signal checks further.

After the previous patch, there's actually no breakpoint type that
returns BPSTAT_SIGNAL_HIDE, so we can go back to having
bpstat_explains_signal return a boolean.  The signal hiding actually
disappears.

gdb/
2013-11-14  Pedro Alves  <palves@redhat.com>

	* break-catch-sig.c (signal_catchpoint_explains_signal): Adjust to
	return a boolean.
	* breakpoint.c (bpstat_explains_signal): Adjust to return a
	boolean.
	(explains_signal_watchpoint, base_breakpoint_explains_signal):
	Adjust to return a boolean.
	* breakpoint.h (enum bpstat_signal_value): Delete.
	(struct breakpoint_ops) <explains_signal>: New returns a boolean.
	(bpstat_explains_signal): Likewise.
	* infrun.c (handle_inferior_event) <random signal checks>:
	bpstat_explains_signal now returns a boolean - adjust.  No longer
	consider hiding signals.

5 files changed, 40 insertions, 58 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index bb09ebe..58e7f2e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,20 @@
 2013-11-14  Pedro Alves  <palves@redhat.com>
 
+	* break-catch-sig.c (signal_catchpoint_explains_signal): Adjust to
+	return a boolean.
+	* breakpoint.c (bpstat_explains_signal): Adjust to return a
+	boolean.
+	(explains_signal_watchpoint, base_breakpoint_explains_signal):
+	Adjust to return a boolean.
+	* breakpoint.h (enum bpstat_signal_value): Delete.
+	(struct breakpoint_ops) <explains_signal>: New returns a boolean.
+	(bpstat_explains_signal): Likewise.
+	* infrun.c (handle_inferior_event) <random signal checks>:
+	bpstat_explains_signal now returns a boolean - adjust.  No longer
+	consider hiding signals.
+
+2013-11-14  Pedro Alves  <palves@redhat.com>
+
 	* breakpoint.c (bpstat_explains_signal) <Moribund locations>:
 	Return BPSTAT_SIGNAL_PASS instead of BPSTAT_SIGNAL_HIDE.
 	(explains_signal_watchpoint): Return BPSTAT_SIGNAL_PASS instead of
diff --git a/gdb/break-catch-sig.c b/gdb/break-catch-sig.c
index 02d8b4a..c82984a 100644
--- a/gdb/break-catch-sig.c
+++ b/gdb/break-catch-sig.c
@@ -350,10 +350,10 @@ signal_catchpoint_print_recreate (struct breakpoint *b, struct ui_file *fp)
 /* Implement the "explains_signal" breakpoint_ops method for signal
    catchpoints.  */
 
-static enum bpstat_signal_value
+static int
 signal_catchpoint_explains_signal (struct breakpoint *b, enum gdb_signal sig)
 {
-  return BPSTAT_SIGNAL_PASS;
+  return 1;
 }
 
 /* Create a new signal catchpoint.  TEMPFLAG is true if this should be
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index e8ea0c3..260021e 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -4222,35 +4222,27 @@ bpstat_find_breakpoint (bpstat bsp, struct breakpoint *breakpoint)
 
 /* See breakpoint.h.  */
 
-enum bpstat_signal_value
+int
 bpstat_explains_signal (bpstat bsp, enum gdb_signal sig)
 {
-  enum bpstat_signal_value result = BPSTAT_SIGNAL_NO;
-
   for (; bsp != NULL; bsp = bsp->next)
     {
-      /* Ensure that, if we ever entered this loop, then we at least
-	 return BPSTAT_SIGNAL_HIDE.  */
-      enum bpstat_signal_value newval;
-
       if (bsp->breakpoint_at == NULL)
 	{
 	  /* A moribund location can never explain a signal other than
 	     GDB_SIGNAL_TRAP.  */
 	  if (sig == GDB_SIGNAL_TRAP)
-	    newval = BPSTAT_SIGNAL_PASS;
-	  else
-	    newval = BPSTAT_SIGNAL_NO;
+	    return 1;
 	}
       else
-	newval = bsp->breakpoint_at->ops->explains_signal (bsp->breakpoint_at,
-							   sig);
-
-      if (newval > result)
-	result = newval;
+	{
+	  if (bsp->breakpoint_at->ops->explains_signal (bsp->breakpoint_at,
+							sig))
+	    return 1;
+	}
     }
 
-  return result;
+  return 0;
 }
 
 /* Put in *NUM the breakpoint number of the first breakpoint we are
@@ -10771,15 +10763,15 @@ print_recreate_watchpoint (struct breakpoint *b, struct ui_file *fp)
 /* Implement the "explains_signal" breakpoint_ops method for
    watchpoints.  */
 
-static enum bpstat_signal_value
+static int
 explains_signal_watchpoint (struct breakpoint *b, enum gdb_signal sig)
 {
   /* A software watchpoint cannot cause a signal other than
      GDB_SIGNAL_TRAP.  */
   if (b->type == bp_watchpoint && sig != GDB_SIGNAL_TRAP)
-    return BPSTAT_SIGNAL_NO;
+    return 0;
 
-  return BPSTAT_SIGNAL_PASS;
+  return 1;
 }
 
 /* The breakpoint_ops structure to be used in hardware watchpoints.  */
@@ -12887,10 +12879,10 @@ base_breakpoint_decode_linespec (struct breakpoint *b, char **s,
 
 /* The default 'explains_signal' method.  */
 
-static enum bpstat_signal_value
+static int
 base_breakpoint_explains_signal (struct breakpoint *b, enum gdb_signal sig)
 {
-  return BPSTAT_SIGNAL_PASS;
+  return 1;
 }
 
 /* The default "after_condition_true" method.  */
diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 4a25fb7..b2ff02c 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -470,22 +470,6 @@ struct bp_location
   struct symtab *symtab;
 };
 
-/* Return values for bpstat_explains_signal.  Note that the order of
-   the constants is important here; they are compared directly in
-   bpstat_explains_signal.  */
-
-enum bpstat_signal_value
-  {
-    /* bpstat does not explain this signal.  */
-    BPSTAT_SIGNAL_NO = 0,
-
-    /* bpstat explains this signal; signal should not be delivered.  */
-    BPSTAT_SIGNAL_HIDE,
-
-    /* bpstat explains this signal; signal should be delivered.  */
-    BPSTAT_SIGNAL_PASS
-  };
-
 /* This structure is a collection of function pointers that, if available,
    will be called instead of the performing the default action for this
    bptype.  */
@@ -600,12 +584,9 @@ struct breakpoint_ops
   void (*decode_linespec) (struct breakpoint *, char **,
 			   struct symtabs_and_lines *);
 
-  /* Return true if this breakpoint explains a signal, but the signal
-     should still be delivered to the inferior.  This is used to make
-     'catch signal' interact properly with 'handle'; see
+  /* Return true if this breakpoint explains a signal.  See
      bpstat_explains_signal.  */
-  enum bpstat_signal_value (*explains_signal) (struct breakpoint *,
-					       enum gdb_signal);
+  int (*explains_signal) (struct breakpoint *, enum gdb_signal);
 
   /* Called after evaluating the breakpoint's condition,
      and only if it evaluated true.  */
@@ -1002,11 +983,10 @@ struct bpstat_what bpstat_what (bpstat);
 /* Find the bpstat associated with a breakpoint.  NULL otherwise.  */
 bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
 
-/* Nonzero if a signal that we got in wait() was due to circumstances
-   explained by the bpstat; and the signal should therefore not be
-   delivered.  */
-extern enum bpstat_signal_value bpstat_explains_signal (bpstat,
-							enum gdb_signal);
+/* Nonzero if a signal that we got in target_wait() was due to
+   circumstances explained by the bpstat; the signal is therefore not
+   random.  */
+extern int bpstat_explains_signal (bpstat, enum gdb_signal);
 
 /* Nonzero is this bpstat causes a stop.  */
 extern int bpstat_causes_stop (bpstat);
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 8eb2ddd..4d26e37 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -3154,7 +3154,6 @@ handle_inferior_event (struct execution_control_state *ecs)
   int stepped_after_stopped_by_watchpoint = 0;
   enum stop_kind stop_soon;
   int random_signal;
-  enum bpstat_signal_value sval;
 
   if (ecs->ws.kind == TARGET_WAITKIND_IGNORE)
     {
@@ -4226,9 +4225,8 @@ Cannot fill $_exitsignal with the correct signal number.\n"));
 
   if (debug_infrun
       && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
-      && (bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
+      && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
 				  GDB_SIGNAL_TRAP)
-	  == BPSTAT_SIGNAL_NO)
       && stopped_by_watchpoint)
     fprintf_unfiltered (gdb_stdlog,
 			"infrun: no user watchpoint explains "
@@ -4255,9 +4253,9 @@ Cannot fill $_exitsignal with the correct signal number.\n"));
      SPARC.  */
 
   /* See if the breakpoints module can explain the signal.  */
-  sval = bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
-				 ecs->event_thread->suspend.stop_signal);
-  random_signal = (sval == BPSTAT_SIGNAL_NO);
+  random_signal
+    = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
+			       ecs->event_thread->suspend.stop_signal);
 
   /* If not, perhaps stepping/nexting can.  */
   if (random_signal)
@@ -4268,9 +4266,6 @@ Cannot fill $_exitsignal with the correct signal number.\n"));
   if (random_signal)
     random_signal = !stopped_by_watchpoint;
 
-  if (sval == BPSTAT_SIGNAL_HIDE)
-    ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
-
   /* For the program's own signals, act according to
      the signal handling tables.  */