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

[David Malcolm via Gcc-patches]

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