[PATCH 8/9] analyzer: handle strlen(BITS_WITHIN) [PR105899]

[David Malcolm <dmalcolm@redhat.com>]

gcc/analyzer/ChangeLog:
	PR analyzer/105899
	* region-model.cc (fragment::has_null_terminator): Handle
	SK_BITS_WITHIN.
---
 gcc/analyzer/region-model.cc | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/gcc/analyzer/region-model.cc b/gcc/analyzer/region-model.cc
index 6574ec140074..025b555d7b97 100644
--- a/gcc/analyzer/region-model.cc
+++ b/gcc/analyzer/region-model.cc
@@ -3357,10 +3357,29 @@ struct fragment
 	}
 	break;
 
+      case SK_BITS_WITHIN:
+	{
+	  const bits_within_svalue *bits_within_sval
+	    = (const bits_within_svalue *)m_sval;
+	  byte_range bytes (0, 0);
+	  if (bits_within_sval->get_bits ().as_byte_range (&bytes))
+	    {
+	      const svalue *inner_sval = bits_within_sval->get_inner_svalue ();
+	      fragment f (byte_range
+			  (start_read_offset - bytes.get_start_bit_offset (),
+			   std::max<byte_size_t> (bytes.m_size_in_bytes,
+						  available_bytes)),
+			  inner_sval);
+	      return f.has_null_terminator (start_read_offset, out_bytes_read);
+	    }
+	}
+	break;
+
       default:
 	// TODO: it may be possible to handle other cases here.
-	return tristate::TS_UNKNOWN;
+	break;
       }
+    return tristate::TS_UNKNOWN;
   }
 
   static tristate
-- 
2.26.3