Handle null cfun [PR102243].

[thirdparty/gcc.git] / gcc / tree-ssa-strlen.c

diff --git a/gcc/tree-ssa-strlen.c b/gcc/tree-ssa-strlen.c
index 7c93958e9addcdc1cefd8947c7a16f7af5224080..7c568a42d49838a6aa2eb944cb6954884f22cf59 100644 (file)
--- a/gcc/tree-ssa-strlen.c
+++ b/gcc/tree-ssa-strlen.c
@@ -199,16 +199,22 @@ static bool handle_assign (gimple_stmt_iterator *, tree, bool *,
 
 /* Sets MINMAX to either the constant value or the range VAL is in
    and returns either the constant value or VAL on success or null
-   when the range couldn't be determined.  Uses RVALS when nonnull
-   to determine the range, otherwise uses CFUN or global range info,
-   whichever is nonnull.  */
+   when the range couldn't be determined.  Uses RVALS or CFUN for
+   range info, whichever is nonnull.  */
 
 tree
 get_range (tree val, gimple *stmt, wide_int minmax[2],
           range_query *rvals /* = NULL */)
 {
   if (!rvals)
-    rvals = get_range_query (cfun);
+    {
+      if (!cfun)
+       /* When called from front ends for global initializers CFUN
+          may be null.  */
+       return NULL_TREE;
+
+      rvals = get_range_query (cfun);
+    }
 
   value_range vr;
   if (!rvals->range_of_expr (vr, val, stmt))