[RFA]: Fix for do_mixed_source_and_assembly in disasm.c

[Jeff Johnston <jjohnstn at redhat dot com>]

There are a few bugs in do_mixed_source_and_assembly() when dealing with 
the ia64.  One problem is that cleanups  for tuples and lists can 
possibly be deferred to a future iteration of a loop, however, the 
values are reinitialized to NULL each time at the start of the loop.  
Another problem is that the code to figure out if the list/tuple should 
be closed off is inside a block of code that is not always reached in 
every iteration.  These two problems combined to cause a SIGSEGV in gdb 
because a NULL pointer gets passed into do_cleanups() which causes all 
cleanups to be performed up the chain.  I have submitted a separate 
patch to prevent running the entire chain when NULL input is passed.

Ok to commit?

-- Jeff J.

2003-12-17  Jeff Johnston  <jjohnstn@redhat.com>

       * disasm.c (do_mixed_source_and_assembly): For uiout asm list
       and tuple cleanups, don't reset to NULL until we close off the
       tuple/list.  Also move check for whether to close off the
       asm tuple/list to where it will be run on each iteration of the
       loop.


Index: disasm.c
===================================================================
RCS file: /cvs/src/src/gdb/disasm.c,v
retrieving revision 1.17
diff -u -p -r1.17 disasm.c
--- disasm.c	24 Oct 2003 17:37:03 -0000	1.17
+++ disasm.c	17 Dec 2003 20:37:25 -0000
@@ -164,6 +164,8 @@ do_mixed_source_and_assembly (struct ui_
   CORE_ADDR pc;
   int num_displayed = 0;
   struct cleanup *ui_out_chain;
+  struct cleanup *ui_out_tuple_chain = NULL;
+  struct cleanup *ui_out_list_chain = NULL;
 
   mle = (struct dis_line_entry *) alloca (nlines
 					  * sizeof (struct dis_line_entry));
@@ -221,8 +223,6 @@ do_mixed_source_and_assembly (struct ui_
 
   for (i = 0; i < newlines; i++)
     {
-      struct cleanup *ui_out_tuple_chain = NULL;
-      struct cleanup *ui_out_list_chain = NULL;
       int close_list = 1;
       
       /* Print out everything from next_line to the current line.  */
@@ -275,19 +275,21 @@ do_mixed_source_and_assembly (struct ui_
 	  next_line = mle[i].line + 1;
 	  ui_out_list_chain
 	    = make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn");
-	  /* Don't close the list if the lines are not in order. */
-	  if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line)
-	    close_list = 0;
 	}
 
+      /* Don't close the list if the lines are not in order. */
+      if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line)
+	close_list = 0;
+
       num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc,
 				   how_many, stb);
       if (close_list)
 	{
 	  do_cleanups (ui_out_list_chain);
 	  do_cleanups (ui_out_tuple_chain);
+	  ui_out_tuple_chain = NULL;
+	  ui_out_list_chain = NULL;
 	  ui_out_text (uiout, "\n");
-	  close_list = 0;
 	}
       if (how_many >= 0)
 	if (num_displayed >= how_many)