[gdb] Factor out compare_pointers

Factor out compare_pointers, use it in compare_symbols and compare_msymbols,
and add comments about unstable sorting result.

Tested on x86_64-linux.

Reviewed-By: Guinevere Larsen <guinevere@redhat.com>
Approved-By: Andrew Burgess <aburgess@redhat.com>

diff --git a/gdb/linespec.c b/gdb/linespec.c
index 53a59abfe90843e2155f9cd8584d94ae46f607d7..9d6fec81783307d2354fb4091b27386af3cc7080 100644 (file)
--- a/gdb/linespec.c
+++ b/gdb/linespec.c
@@ -3422,6 +3422,15 @@ compare_pspace (const struct program_space *a, const struct program_space *b)
   return 0;
 }
 
+/* An std::sort comparison function for pointers.  Don't use this if stable
+   sorting results are required.  */
+
+static bool
+compare_pointers (void *a, void *b)
+{
+  return (uintptr_t)a < (uintptr_t)b;
+}
+
 /* An std::sort comparison function for symbols.  The requirement is that
    symbols with the same program space end up next to each other.  This is for
    the purpose of iterating over the symbols and doing something once for each
@@ -3441,14 +3450,9 @@ compare_symbols (const block_symbol &a, const block_symbol &b)
   if (cmp == 1)
     return false;
 
-  uintptr_t uia, uib;
-  uia = (uintptr_t) a.symbol;
-  uib = (uintptr_t) b.symbol;
-
-  if (uia < uib)
-    return true;
-
-  return false;
+  /* This gives unstable sorting results.  We assume that this doesn't
+     matter.  */
+  return compare_pointers (a.symbol, b.symbol);
 }
 
 /* Like compare_symbols but for minimal symbols.  */
@@ -3463,14 +3467,9 @@ compare_msymbols (const bound_minimal_symbol &a, const bound_minimal_symbol &b)
   if (cmp == 1)
     return false;
 
-  uintptr_t uia, uib;
-  uia = (uintptr_t) a.minsym;
-  uib = (uintptr_t) b.minsym;
-
-  if (uia < uib)
-    return true;
-
-  return false;
+  /* This gives unstable sorting results.  We assume that this doesn't
+     matter.  */
+  return compare_pointers (a.minsym, b.minsym);
 }
 
 /* Look for all the matching instances of each symbol in NAMES.  Only