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Re: [RFA]: pending breakpoint support [1/3]


Patch checked in. I have included the final patch here with the reworded message.

-- Jeff J.

Jeff Johnston wrote:

Daniel Jacobowitz wrote:

On Fri, Jan 30, 2004 at 05:45:55PM -0500, Jeff Johnston wrote:


Well, therein lies the problem. The word "if" might or might not be part of the symbol. The
regular logic relies on parsing out the symbol first and then looking at the aftermath. I don't have
that luxury so I punt. It may be slightly confusing if the user does the scenario above, but the
displayed pending breakpoint info is meant to be the "original breakpoint string" so I don't anticipate
the user will object too much. Ok or do you have a better idea?


Right, I see. This is fine. The patch is OK to commit with the
"resolved" wording change - thanks for your patience!



Thanks.



Index: breakpoint.h
===================================================================
RCS file: /cvs/src/src/gdb/breakpoint.h,v
retrieving revision 1.30
diff -u -p -r1.30 breakpoint.h
--- breakpoint.h	1 Feb 2004 18:05:09 -0000	1.30
+++ breakpoint.h	2 Feb 2004 21:10:31 -0000
@@ -386,6 +386,17 @@ struct breakpoint
 
     /* Methods associated with this breakpoint.  */
     struct breakpoint_ops *ops;
+
+    /* Was breakpoint issued from a tty?  Saved for the use of pending breakpoints.  */
+    int from_tty;
+
+    /* Flag value for pending breakpoint.
+       first bit  : 0 non-temporary, 1 temporary.
+       second bit : 0 normal breakpoint, 1 hardware breakpoint. */
+    int flag;
+
+    /* Is breakpoint pending on shlib loads?  */
+    int pending;
   };
 
 /* The following stuff is an abstract data type "bpstat" ("breakpoint
Index: breakpoint.c
===================================================================
RCS file: /cvs/src/src/gdb/breakpoint.c,v
retrieving revision 1.156
diff -u -p -r1.156 breakpoint.c
--- breakpoint.c	1 Feb 2004 18:05:09 -0000	1.156
+++ breakpoint.c	2 Feb 2004 21:10:31 -0000
@@ -89,7 +89,7 @@ extern void break_at_finish_at_depth_com
 
 extern void tbreak_at_finish_command (char *, int);
 
-static void break_command_1 (char *, int, int);
+static int break_command_1 (char *, int, int, struct breakpoint *);
 
 static void mention (struct breakpoint *);
 
@@ -119,6 +119,8 @@ static void condition_command (char *, i
 
 static int get_number_trailer (char **, int);
 
+static int do_captured_parse_breakpoint (struct ui_out *, void *);
+
 void set_breakpoint_count (int);
 
 typedef enum
@@ -322,7 +324,7 @@ int exception_support_initialized = 0;
 static int
 breakpoint_enabled (struct breakpoint *b)
 {
-  return b->enable_state == bp_enabled;
+  return (b->enable_state == bp_enabled && !b->pending);
 }
 
 /* Set breakpoint count to NUM.  */
@@ -556,9 +558,12 @@ condition_command (char *arg, int from_t
 	  /* I don't know if it matters whether this is the string the user
 	     typed in or the decompiled expression.  */
 	  b->cond_string = savestring (arg, strlen (arg));
-	  b->cond = parse_exp_1 (&arg, block_for_pc (b->loc->address), 0);
-	  if (*arg)
-	    error ("Junk at end of expression");
+	  if (!b->pending)
+	    {
+	      b->cond = parse_exp_1 (&arg, block_for_pc (b->loc->address), 0);
+	      if (*arg)
+		error ("Junk at end of expression");
+	    }
 	}
       breakpoints_changed ();
       breakpoint_modify_event (b->number);
@@ -3465,7 +3470,16 @@ print_one_breakpoint (struct breakpoint 
 	if (addressprint)
 	  {
 	    annotate_field (4);
-	    ui_out_field_core_addr (uiout, "addr", b->loc->address);
+	    if (b->pending)
+	      {
+		ui_out_field_string (uiout, "addr", "<PENDING>");
+		if (TARGET_ADDR_BIT <= 32)
+		  ui_out_spaces (uiout, 2);
+		else
+		  ui_out_spaces (uiout, 8);
+	      }
+	    else
+	      ui_out_field_core_addr (uiout, "addr", b->loc->address);
 	  }
 	annotate_field (5);
 	*last_addr = b->loc->address;
@@ -3484,6 +3498,10 @@ print_one_breakpoint (struct breakpoint 
 	    ui_out_text (uiout, ":");
 	    ui_out_field_int (uiout, "line", b->line_number);
 	  }
+	else if (b->pending)
+	  {
+	    ui_out_field_string (uiout, "pending", b->addr_string);
+	  }
 	else
 	  {
 	    print_address_symbolic (b->loc->address, stb->stream, demangle, "");
@@ -3520,7 +3538,15 @@ print_one_breakpoint (struct breakpoint 
       ui_out_field_stream (uiout, "cond", stb);
       ui_out_text (uiout, "\n");
     }
-  
+
+  if (b->pending && b->cond_string)
+    {
+      annotate_field (7);
+      ui_out_text (uiout, "\tstop only if ");
+      ui_out_field_string (uiout, "cond", b->cond_string);
+      ui_out_text (uiout, "\n");
+    }
+
   if (b->thread != -1)
     {
       /* FIXME should make an annotation for this */
@@ -3751,14 +3777,14 @@ describe_other_breakpoints (CORE_ADDR pc
 
   ALL_BREAKPOINTS (b)
     if (b->loc->address == pc)	/* address match / overlay match */
-      if (!overlay_debugging || b->loc->section == section)
+      if (!b->pending && (!overlay_debugging || b->loc->section == section))
 	others++;
   if (others > 0)
     {
       printf_filtered ("Note: breakpoint%s ", (others > 1) ? "s" : "");
       ALL_BREAKPOINTS (b)
 	if (b->loc->address == pc)	/* address match / overlay match */
-	  if (!overlay_debugging || b->loc->section == section)
+	  if (!b->pending && (!overlay_debugging || b->loc->section == section))
 	    {
 	      others--;
 	      printf_filtered ("%d%s%s ",
@@ -3847,6 +3873,7 @@ check_duplicates (struct breakpoint *bpt
   ALL_BP_LOCATIONS (b)
     if (b->owner->enable_state != bp_disabled
 	&& b->owner->enable_state != bp_shlib_disabled
+	&& !b->owner->pending
 	&& b->owner->enable_state != bp_call_disabled
 	&& b->address == address	/* address / overlay match */
 	&& (!overlay_debugging || b->section == section)
@@ -3881,6 +3908,7 @@ check_duplicates (struct breakpoint *bpt
 	  {
 	    if (b->owner->enable_state != bp_disabled
 		&& b->owner->enable_state != bp_shlib_disabled
+		&& !b->owner->pending
 		&& b->owner->enable_state != bp_call_disabled
 		&& b->address == address	/* address / overlay match */
 		&& (!overlay_debugging || b->section == section)
@@ -4057,6 +4085,7 @@ set_raw_breakpoint (struct symtab_and_li
   b->forked_inferior_pid = 0;
   b->exec_pathname = NULL;
   b->ops = NULL;
+  b->pending = 0;
 
   /* Add this breakpoint to the end of the chain
      so that a list of breakpoints will come out in order
@@ -4295,23 +4324,90 @@ disable_breakpoints_in_shlibs (int silen
   }
 }
 
+struct captured_parse_breakpoint_args
+  {
+    char **arg_p;
+    struct symtabs_and_lines *sals_p;
+    char ***addr_string_p;
+    int *not_found_ptr;
+  };
+
+struct lang_and_radix
+  {
+    enum language lang;
+    int radix;
+  };
+
+/* Cleanup helper routine to restore the current language and
+   input radix.  */
+static void
+do_restore_lang_radix_cleanup (void *old)
+{
+  struct lang_and_radix *p = old;
+  set_language (p->lang);
+  input_radix = p->radix;
+}
+
+/* Try and resolve a pending breakpoint.  */
+static int
+resolve_pending_breakpoint (struct breakpoint *b)
+{
+  /* Try and reparse the breakpoint in case the shared library
+     is now loaded.  */
+  struct symtabs_and_lines sals;
+  struct symtab_and_line pending_sal;
+  char **cond_string = (char **) NULL;
+  char *copy_arg = b->addr_string;
+  char **addr_string;
+  char *errmsg;
+  int rc;
+  int not_found = 0;
+  struct ui_file *old_gdb_stderr;
+  struct lang_and_radix old_lr;
+  struct cleanup *old_chain;
+  
+  /* Set language, input-radix, then reissue breakpoint command. 
+     Ensure the language and input-radix are restored afterwards.  */
+  old_lr.lang = current_language->la_language;
+  old_lr.radix = input_radix;
+  old_chain = make_cleanup (do_restore_lang_radix_cleanup, &old_lr);
+  
+  set_language (b->language);
+  input_radix = b->input_radix;
+  rc = break_command_1 (b->addr_string, b->flag, b->from_tty, b);
+  
+  if (rc == GDB_RC_OK)
+    /* Pending breakpoint has been resolved.  */
+    printf_filtered ("Pending breakpoint \"%s\" resolved\n", b->addr_string);
+
+  do_cleanups (old_chain);
+  return rc;
+}
+
 /* Try to reenable any breakpoints in shared libraries.  */
 void
 re_enable_breakpoints_in_shlibs (void)
 {
-  struct breakpoint *b;
+  struct breakpoint *b, *tmp;
 
-  ALL_BREAKPOINTS (b)
+  ALL_BREAKPOINTS_SAFE (b, tmp)
+  {
     if (b->enable_state == bp_shlib_disabled)
-    {
-      char buf[1], *lib;
-
-      /* Do not reenable the breakpoint if the shared library
-         is still not mapped in.  */
-      lib = PC_SOLIB (b->loc->address);
-      if (lib != NULL && target_read_memory (b->loc->address, buf, 1) == 0)
-	b->enable_state = bp_enabled;
-    }
+      {
+	char buf[1], *lib;
+	
+	/* Do not reenable the breakpoint if the shared library
+	   is still not mapped in.  */
+	lib = PC_SOLIB (b->loc->address);
+	if (lib != NULL && target_read_memory (b->loc->address, buf, 1) == 0)
+	  b->enable_state = bp_enabled;
+      }
+    else if (b->pending && (b->enable_state == bp_enabled))
+      {
+	if (resolve_pending_breakpoint (b) == GDB_RC_OK)
+	  delete_breakpoint (b);
+      }
+  }
 }
 
 #endif
@@ -4723,14 +4819,21 @@ mention (struct breakpoint *b)
 
   if (say_where)
     {
-      if (addressprint || b->source_file == NULL)
+      if (b->pending)
 	{
-	  printf_filtered (" at ");
-	  print_address_numeric (b->loc->address, 1, gdb_stdout);
+	  printf_filtered (" (%s) pending.", b->addr_string);
+	}
+      else
+	{
+	  if (addressprint || b->source_file == NULL)
+	    {
+	      printf_filtered (" at ");
+	      print_address_numeric (b->loc->address, 1, gdb_stdout);
+	    }
+	  if (b->source_file)
+	    printf_filtered (": file %s, line %d.",
+			     b->source_file, b->line_number);
 	}
-      if (b->source_file)
-	printf_filtered (": file %s, line %d.",
-			 b->source_file, b->line_number);
     }
   do_cleanups (old_chain);
   if (ui_out_is_mi_like_p (uiout))
@@ -4743,6 +4846,11 @@ mention (struct breakpoint *b)
    SALS.sal[i] breakpoint, include the corresponding ADDR_STRING[i],
    COND[i] and COND_STRING[i] values.
 
+   The parameter PENDING_BP points to a pending breakpoint that is
+   the basis of the breakpoints currently being created.  The pending
+   breakpoint may contain a separate condition string or commands
+   that were added after the initial pending breakpoint was created.
+
    NOTE: If the function succeeds, the caller is expected to cleanup
    the arrays ADDR_STRING, COND_STRING, COND and SALS (but not the
    array contents).  If the function fails (error() is called), the
@@ -4753,7 +4861,8 @@ static void
 create_breakpoints (struct symtabs_and_lines sals, char **addr_string,
 		    struct expression **cond, char **cond_string,
 		    enum bptype type, enum bpdisp disposition,
-		    int thread, int ignore_count, int from_tty)
+		    int thread, int ignore_count, int from_tty,
+		    struct breakpoint *pending_bp)
 {
   if (type == bp_hardware_breakpoint)
     {
@@ -4793,6 +4902,26 @@ create_breakpoints (struct symtabs_and_l
 	b->ignore_count = ignore_count;
 	b->enable_state = bp_enabled;
 	b->disposition = disposition;
+	/* If resolving a pending breakpoint, a check must be made to see if
+	   the user has specified a new condition or commands for the 
+	   breakpoint.  A new condition will override any condition that was 
+	   initially specified with the initial breakpoint command.  */
+	if (pending_bp)
+	  {
+	    char *arg;
+	    if (pending_bp->cond_string)
+	      {
+		arg = pending_bp->cond_string;
+		b->cond_string = savestring (arg, strlen (arg));
+		b->cond = parse_exp_1 (&arg, block_for_pc (b->loc->address), 0);
+		if (*arg)
+		  error ("Junk at end of pending breakpoint condition expression");
+	      }
+	    /* If there are commands associated with the breakpoint, they should 
+	       be copied too.  */
+	    if (pending_bp->commands)
+	      b->commands = copy_command_lines (pending_bp->commands);
+	  }
 	mention (b);
       }
   }    
@@ -4806,7 +4935,8 @@ create_breakpoints (struct symtabs_and_l
 static void
 parse_breakpoint_sals (char **address,
 		       struct symtabs_and_lines *sals,
-		       char ***addr_string)
+		       char ***addr_string,
+		       int *not_found_ptr)
 {
   char *addr_start = *address;
   *addr_string = NULL;
@@ -4847,9 +4977,11 @@ parse_breakpoint_sals (char **address,
  	      || ((strchr ("+-", (*address)[0]) != NULL)
  		  && ((*address)[1] != '['))))
 	*sals = decode_line_1 (address, 1, default_breakpoint_symtab,
-			       default_breakpoint_line, addr_string, NULL);
+			       default_breakpoint_line, addr_string, 
+			       not_found_ptr);
       else
-	*sals = decode_line_1 (address, 1, (struct symtab *) NULL, 0, addr_string, NULL);
+	*sals = decode_line_1 (address, 1, (struct symtab *) NULL, 0,
+		               addr_string, not_found_ptr);
     }
   /* For any SAL that didn't have a canonical string, fill one in. */
   if (sals->nelts > 0 && *addr_string == NULL)
@@ -4903,26 +5035,44 @@ breakpoint_sals_to_pc (struct symtabs_an
     }
 }
 
+static int
+do_captured_parse_breakpoint (struct ui_out *ui, void *data)
+{
+  struct captured_parse_breakpoint_args *args = data;
+  
+  parse_breakpoint_sals (args->arg_p, args->sals_p, args->addr_string_p, 
+		         args->not_found_ptr);
+
+  return GDB_RC_OK;
+}
+
 /* Set a breakpoint according to ARG (function, linenum or *address)
    flag: first bit  : 0 non-temporary, 1 temporary.
-   second bit : 0 normal breakpoint, 1 hardware breakpoint. */
+   second bit : 0 normal breakpoint, 1 hardware breakpoint. 
 
-static void
-break_command_1 (char *arg, int flag, int from_tty)
+   PENDING_BP is non-NULL when this function is being called to resolve
+   a pending breakpoint.  */
+
+static int
+break_command_1 (char *arg, int flag, int from_tty, struct breakpoint *pending_bp)
 {
   int tempflag, hardwareflag;
   struct symtabs_and_lines sals;
   struct expression **cond = 0;
-  /* Pointers in arg to the start, and one past the end, of the
-     condition.  */
+  struct symtab_and_line pending_sal;
   char **cond_string = (char **) NULL;
+  char *copy_arg;
+  char *err_msg;
   char *addr_start = arg;
   char **addr_string;
   struct cleanup *old_chain;
   struct cleanup *breakpoint_chain = NULL;
-  int i;
+  struct captured_parse_breakpoint_args parse_args;
+  int i, rc;
+  int pending = 0;
   int thread = -1;
   int ignore_count = 0;
+  int not_found = 0;
 
   hardwareflag = flag & BP_HARDWAREFLAG;
   tempflag = flag & BP_TEMPFLAG;
@@ -4930,19 +5080,55 @@ break_command_1 (char *arg, int flag, in
   sals.sals = NULL;
   sals.nelts = 0;
   addr_string = NULL;
-  parse_breakpoint_sals (&arg, &sals, &addr_string);
 
-  if (!sals.nelts)
-    return;
+  parse_args.arg_p = &arg;
+  parse_args.sals_p = &sals;
+  parse_args.addr_string_p = &addr_string;
+  parse_args.not_found_ptr = &not_found;
+
+  rc = catch_exceptions_with_msg (uiout, do_captured_parse_breakpoint, 
+		  		  &parse_args, NULL, &err_msg, 
+				  RETURN_MASK_ALL);
+
+  /* If caller is interested in rc value from parse, set value.  */
+
+  if (rc != GDB_RC_OK)
+    {
+      /* Check for file or function not found.  */
+      if (not_found)
+	{
+	  /* If called to resolve pending breakpoint, just return error code.  */
+	  if (pending_bp)
+	    return rc;
+
+	  error_output_message (NULL, err_msg);
+	  xfree (err_msg);
+	  if (!query ("Make breakpoint pending on future shared library load? "))
+	    return rc;
+	  copy_arg = xstrdup (addr_start);
+	  addr_string = &copy_arg;
+	  sals.nelts = 1;
+	  sals.sals = &pending_sal;
+	  pending_sal.pc = 0;
+	  pending = 1;
+	}
+      else
+	return rc;
+    }
+  else if (!sals.nelts)
+    return GDB_RC_FAIL;
 
   /* Create a chain of things that always need to be cleaned up. */
   old_chain = make_cleanup (null_cleanup, 0);
 
-  /* Make sure that all storage allocated to SALS gets freed.  */
-  make_cleanup (xfree, sals.sals);
-
-  /* Cleanup the addr_string array but not its contents. */
-  make_cleanup (xfree, addr_string);
+  if (!pending)
+    {
+      /* Make sure that all storage allocated to SALS gets freed.  */
+      make_cleanup (xfree, sals.sals);
+      
+      /* Cleanup the addr_string array but not its contents. */
+      make_cleanup (xfree, addr_string);
+    }
 
   /* Allocate space for all the cond expressions. */
   cond = xcalloc (sals.nelts, sizeof (struct expression *));
@@ -4969,62 +5155,94 @@ break_command_1 (char *arg, int flag, in
 
   /* Resolve all line numbers to PC's and verify that the addresses
      are ok for the target.  */
-  breakpoint_sals_to_pc (&sals, addr_start);
+  if (!pending)
+    breakpoint_sals_to_pc (&sals, addr_start);
 
   /* Verify that condition can be parsed, before setting any
      breakpoints.  Allocate a separate condition expression for each
      breakpoint. */
   thread = -1;			/* No specific thread yet */
-  for (i = 0; i < sals.nelts; i++)
+  if (!pending)
     {
-      char *tok = arg;
-      while (tok && *tok)
+      for (i = 0; i < sals.nelts; i++)
 	{
-	  char *end_tok;
-	  int toklen;
-	  char *cond_start = NULL;
-	  char *cond_end = NULL;
-	  while (*tok == ' ' || *tok == '\t')
-	    tok++;
-
-	  end_tok = tok;
-
-	  while (*end_tok != ' ' && *end_tok != '\t' && *end_tok != '\000')
-	    end_tok++;
-
-	  toklen = end_tok - tok;
-
-	  if (toklen >= 1 && strncmp (tok, "if", toklen) == 0)
-	    {
-	      tok = cond_start = end_tok + 1;
-	      cond[i] = parse_exp_1 (&tok, block_for_pc (sals.sals[i].pc), 0);
-	      make_cleanup (xfree, cond[i]);
-	      cond_end = tok;
-	      cond_string[i] = savestring (cond_start, cond_end - cond_start);
-	      make_cleanup (xfree, cond_string[i]);
-	    }
-	  else if (toklen >= 1 && strncmp (tok, "thread", toklen) == 0)
+	  char *tok = arg;
+	  while (tok && *tok)
 	    {
-	      char *tmptok;
-
-	      tok = end_tok + 1;
-	      tmptok = tok;
-	      thread = strtol (tok, &tok, 0);
-	      if (tok == tmptok)
-		error ("Junk after thread keyword.");
-	      if (!valid_thread_id (thread))
-		error ("Unknown thread %d\n", thread);
+	      char *end_tok;
+	      int toklen;
+	      char *cond_start = NULL;
+	      char *cond_end = NULL;
+	      while (*tok == ' ' || *tok == '\t')
+		tok++;
+	      
+	      end_tok = tok;
+	      
+	      while (*end_tok != ' ' && *end_tok != '\t' && *end_tok != '\000')
+		end_tok++;
+	      
+	      toklen = end_tok - tok;
+	      
+	      if (toklen >= 1 && strncmp (tok, "if", toklen) == 0)
+		{
+		  tok = cond_start = end_tok + 1;
+		  cond[i] = parse_exp_1 (&tok, block_for_pc (sals.sals[i].pc), 
+				         0);
+		  make_cleanup (xfree, cond[i]);
+		  cond_end = tok;
+		  cond_string[i] = savestring (cond_start, 
+				               cond_end - cond_start);
+		  make_cleanup (xfree, cond_string[i]);
+		}
+	      else if (toklen >= 1 && strncmp (tok, "thread", toklen) == 0)
+		{
+		  char *tmptok;
+		  
+		  tok = end_tok + 1;
+		  tmptok = tok;
+		  thread = strtol (tok, &tok, 0);
+		  if (tok == tmptok)
+		    error ("Junk after thread keyword.");
+		  if (!valid_thread_id (thread))
+		    error ("Unknown thread %d\n", thread);
+		}
+	      else
+		error ("Junk at end of arguments.");
 	    }
-	  else
-	    error ("Junk at end of arguments.");
 	}
+      create_breakpoints (sals, addr_string, cond, cond_string,
+			  hardwareflag ? bp_hardware_breakpoint 
+			  : bp_breakpoint,
+			  tempflag ? disp_del : disp_donttouch,
+			  thread, ignore_count, from_tty,
+			  pending_bp);
     }
+  else
+    {
+      struct symtab_and_line sal;
+      struct breakpoint *b;
 
-  create_breakpoints (sals, addr_string, cond, cond_string,
-		      hardwareflag ? bp_hardware_breakpoint : bp_breakpoint,
-		      tempflag ? disp_del : disp_donttouch,
-		      thread, ignore_count, from_tty);
+      sal.symtab = NULL;
+      sal.pc = 0;
 
+      make_cleanup (xfree, copy_arg);
+
+      b = set_raw_breakpoint (sal, hardwareflag ? bp_hardware_breakpoint 
+		              : bp_breakpoint);
+      set_breakpoint_count (breakpoint_count + 1);
+      b->number = breakpoint_count;
+      b->cond = *cond;
+      b->thread = thread;
+      b->addr_string = *addr_string;
+      b->cond_string = *cond_string;
+      b->ignore_count = ignore_count;
+      b->pending = 1;
+      b->disposition = tempflag ? disp_del : disp_donttouch;
+      b->from_tty = from_tty;
+      b->flag = flag;
+      mention (b);
+    }
+  
   if (sals.nelts > 1)
     {
       warning ("Multiple breakpoints were set.");
@@ -5035,6 +5253,8 @@ break_command_1 (char *arg, int flag, in
   discard_cleanups (breakpoint_chain);
   /* But cleanup everything else. */
   do_cleanups (old_chain);
+
+  return GDB_RC_OK;
 }
 
 /* Set a breakpoint of TYPE/DISPOSITION according to ARG (function,
@@ -5071,7 +5291,7 @@ do_captured_breakpoint (void *data)
   sals.nelts = 0;
   address_end = args->address;
   addr_string = NULL;
-  parse_breakpoint_sals (&address_end, &sals, &addr_string);
+  parse_breakpoint_sals (&address_end, &sals, &addr_string, 0);
 
   if (!sals.nelts)
     return GDB_RC_NONE;
@@ -5135,7 +5355,8 @@ do_captured_breakpoint (void *data)
   create_breakpoints (sals, addr_string, cond, cond_string,
 		      args->hardwareflag ? bp_hardware_breakpoint : bp_breakpoint,
 		      args->tempflag ? disp_del : disp_donttouch,
-		      args->thread, args->ignore_count, 0/*from-tty*/);
+		      args->thread, args->ignore_count, 0/*from-tty*/, 
+		      NULL/*pending_bp*/);
 
   /* That's it. Discard the cleanups for data inserted into the
      breakpoint. */
@@ -5227,7 +5448,7 @@ break_at_finish_at_depth_command_1 (char
 	    addr_string = xstrprintf ("*0x%s %s", paddr_nz (high), extra_args);
 	  else
 	    addr_string = xstrprintf ("*0x%s", paddr_nz (high));
-	  break_command_1 (addr_string, flag, from_tty);
+	  break_command_1 (addr_string, flag, from_tty, NULL);
 	  xfree (addr_string);
 	}
       else
@@ -5310,7 +5531,7 @@ break_at_finish_command_1 (char *arg, in
 				       extra_args);
 	  else
 	    break_string = xstrprintf ("*0x%s", paddr_nz (high));
-	  break_command_1 (break_string, flag, from_tty);
+	  break_command_1 (break_string, flag, from_tty, NULL);
 	  xfree (break_string);
 	}
       else
@@ -5377,7 +5598,7 @@ resolve_sal_pc (struct symtab_and_line *
 void
 break_command (char *arg, int from_tty)
 {
-  break_command_1 (arg, 0, from_tty);
+  break_command_1 (arg, 0, from_tty, NULL);
 }
 
 void
@@ -5395,7 +5616,7 @@ break_at_finish_at_depth_command (char *
 void
 tbreak_command (char *arg, int from_tty)
 {
-  break_command_1 (arg, BP_TEMPFLAG, from_tty);
+  break_command_1 (arg, BP_TEMPFLAG, from_tty, NULL);
 }
 
 void
@@ -5407,13 +5628,13 @@ tbreak_at_finish_command (char *arg, int
 static void
 hbreak_command (char *arg, int from_tty)
 {
-  break_command_1 (arg, BP_HARDWAREFLAG, from_tty);
+  break_command_1 (arg, BP_HARDWAREFLAG, from_tty, NULL);
 }
 
 static void
 thbreak_command (char *arg, int from_tty)
 {
-  break_command_1 (arg, (BP_TEMPFLAG | BP_HARDWAREFLAG), from_tty);
+  break_command_1 (arg, (BP_TEMPFLAG | BP_HARDWAREFLAG), from_tty, NULL);
 }
 
 static void
@@ -5454,7 +5675,7 @@ stopin_command (char *arg, int from_tty)
   if (badInput)
     printf_filtered ("Usage: stop in <function | address>\n");
   else
-    break_command_1 (arg, 0, from_tty);
+    break_command_1 (arg, 0, from_tty, NULL);
 }
 
 static void
@@ -5486,7 +5707,7 @@ stopat_command (char *arg, int from_tty)
   if (badInput)
     printf_filtered ("Usage: stop at <line>\n");
   else
-    break_command_1 (arg, 0, from_tty);
+    break_command_1 (arg, 0, from_tty, NULL);
 }
 
 /* accessflag:  hw_write:  watch write, 
@@ -6693,6 +6914,7 @@ delete_breakpoint (struct breakpoint *bp
 	    && !b->loc->duplicate
 	    && b->enable_state != bp_disabled
 	    && b->enable_state != bp_shlib_disabled
+	    && !b->pending
 	    && b->enable_state != bp_call_disabled)
 	{
 	  int val;
@@ -6898,6 +7120,10 @@ breakpoint_re_set_one (void *bint)
          shlib_disabled breakpoint though.  There's a fair chance we
          can't re-set it if the shared library it's in hasn't been
          loaded yet.  */
+
+      if (b->pending)
+	break;
+
       save_enable = b->enable_state;
       if (b->enable_state != bp_shlib_disabled)
         b->enable_state = bp_disabled;
@@ -7313,70 +7539,91 @@ do_enable_breakpoint (struct breakpoint 
 	error ("Hardware breakpoints used exceeds limit.");
     }
 
-  if (bpt->enable_state != bp_permanent)
-    bpt->enable_state = bp_enabled;
-  bpt->disposition = disposition;
-  check_duplicates (bpt);
-  breakpoints_changed ();
-
-  if (bpt->type == bp_watchpoint || 
-      bpt->type == bp_hardware_watchpoint ||
-      bpt->type == bp_read_watchpoint || 
-      bpt->type == bp_access_watchpoint)
-    {
-      if (bpt->exp_valid_block != NULL)
-	{
-	  struct frame_info *fr =
-	  fr = frame_find_by_id (bpt->watchpoint_frame);
-	  if (fr == NULL)
+  if (bpt->pending)
+    {
+      if (bpt->enable_state != bp_enabled)
+	{
+	  /* When enabling a pending breakpoint, we need to check if the breakpoint
+	     is resolvable since shared libraries could have been loaded
+	     after the breakpoint was disabled.  */
+	  breakpoints_changed ();
+ 	  if (resolve_pending_breakpoint (bpt) == GDB_RC_OK)
 	    {
-	      printf_filtered ("\
-Cannot enable watchpoint %d because the block in which its expression\n\
-is valid is not currently in scope.\n", bpt->number);
-	      bpt->enable_state = bp_disabled;
+	      delete_breakpoint (bpt);
 	      return;
 	    }
-
-	  save_selected_frame = deprecated_selected_frame;
-	  save_selected_frame_level = frame_relative_level (deprecated_selected_frame);
-	  select_frame (fr);
+	  bpt->enable_state = bp_enabled;
+	  bpt->disposition = disposition;
 	}
-
-      value_free (bpt->val);
-      mark = value_mark ();
-      bpt->val = evaluate_expression (bpt->exp);
-      release_value (bpt->val);
-      if (VALUE_LAZY (bpt->val))
-	value_fetch_lazy (bpt->val);
-
-      if (bpt->type == bp_hardware_watchpoint ||
-	  bpt->type == bp_read_watchpoint ||
+    }
+  else  /* Not a pending breakpoint.  */
+    {
+      if (bpt->enable_state != bp_permanent)
+	bpt->enable_state = bp_enabled;
+      bpt->disposition = disposition;
+      check_duplicates (bpt);
+      breakpoints_changed ();
+      
+      if (bpt->type == bp_watchpoint || 
+	  bpt->type == bp_hardware_watchpoint ||
+	  bpt->type == bp_read_watchpoint || 
 	  bpt->type == bp_access_watchpoint)
 	{
-	  int i = hw_watchpoint_used_count (bpt->type, &other_type_used);
-	  int mem_cnt = can_use_hardware_watchpoint (bpt->val);
-
-	  /* Hack around 'unused var' error for some targets here */
-	  (void) mem_cnt, i;
-	  target_resources_ok = TARGET_CAN_USE_HARDWARE_WATCHPOINT (
-				   bpt->type, i + mem_cnt, other_type_used);
-	  /* we can consider of type is bp_hardware_watchpoint, convert to 
-	     bp_watchpoint in the following condition */
-	  if (target_resources_ok < 0)
+	  if (bpt->exp_valid_block != NULL)
 	    {
-	      printf_filtered ("\
+	      struct frame_info *fr =
+		fr = frame_find_by_id (bpt->watchpoint_frame);
+	      if (fr == NULL)
+		{
+		  printf_filtered ("\
+Cannot enable watchpoint %d because the block in which its expression\n\
+is valid is not currently in scope.\n", bpt->number);
+		  bpt->enable_state = bp_disabled;
+		  return;
+		}
+	      
+	      save_selected_frame = deprecated_selected_frame;
+	      save_selected_frame_level = frame_relative_level (deprecated_selected_frame);
+	      select_frame (fr);
+	    }
+	  
+	  value_free (bpt->val);
+	  mark = value_mark ();
+	  bpt->val = evaluate_expression (bpt->exp);
+	  release_value (bpt->val);
+	  if (VALUE_LAZY (bpt->val))
+	    value_fetch_lazy (bpt->val);
+	  
+	  if (bpt->type == bp_hardware_watchpoint ||
+	      bpt->type == bp_read_watchpoint ||
+	      bpt->type == bp_access_watchpoint)
+	    {
+	      int i = hw_watchpoint_used_count (bpt->type, &other_type_used);
+	      int mem_cnt = can_use_hardware_watchpoint (bpt->val);
+	      
+	      /* Hack around 'unused var' error for some targets here */
+	      (void) mem_cnt, i;
+	      target_resources_ok = TARGET_CAN_USE_HARDWARE_WATCHPOINT (
+									bpt->type, i + mem_cnt, other_type_used);
+	      /* we can consider of type is bp_hardware_watchpoint, convert to 
+		 bp_watchpoint in the following condition */
+	      if (target_resources_ok < 0)
+		{
+		  printf_filtered ("\
 Cannot enable watchpoint %d because target watch resources\n\
 have been allocated for other watchpoints.\n", bpt->number);
-	      bpt->enable_state = bp_disabled;
-	      value_free_to_mark (mark);
-	      return;
+		  bpt->enable_state = bp_disabled;
+		  value_free_to_mark (mark);
+		  return;
+		}
 	    }
+	  
+	  if (save_selected_frame_level >= 0)
+	    select_frame (save_selected_frame);
+	  value_free_to_mark (mark);
 	}
-
-      if (save_selected_frame_level >= 0)
-	select_frame (save_selected_frame);
-      value_free_to_mark (mark);
     }
+
   if (modify_breakpoint_hook)
     modify_breakpoint_hook (bpt);
   breakpoint_modify_event (bpt->number);

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