PR10475: ensure that loc2c can find its array size

* loc2c.c (array_stride): iterate DIEs past typedef/const/volatile

2 files changed, 23 insertions, 0 deletions

diff --git a/loc2c.c b/loc2c.c
index f5efccfe..26ca3ba1 100644
--- a/loc2c.c
+++ b/loc2c.c
@@ -1749,6 +1749,19 @@ array_stride (Dwarf_Die *typedie, struct location *origin)
 	  dwarf_diename (typedie) ?: "<anonymous>",
 	  dwarf_errmsg (-1));
 
+  int typetag = dwarf_tag(&die_mem);
+  while (typetag == DW_TAG_typedef ||
+         typetag == DW_TAG_const_type ||
+         typetag == DW_TAG_volatile_type)
+    {
+      if (dwarf_attr_integrate (&die_mem, DW_AT_type, &attr_mem) == NULL
+          || dwarf_formref_die (&attr_mem, &die_mem) == NULL)
+        FAIL (origin, N_("cannot get inner type of type %s: %s"),
+              dwarf_diename (&die_mem) ?: "<anonymous>",
+              dwarf_errmsg (-1));
+      typetag = dwarf_tag(&die_mem);
+    }
+
   if (dwarf_attr_integrate (&die_mem, DW_AT_byte_size, &attr_mem) != NULL)
     {
       Dwarf_Word stride;
diff --git a/testsuite/semok/bz10475.stp b/testsuite/semok/bz10475.stp
new file mode 100755
index 00000000..ee79b07d
--- /dev/null
+++ b/testsuite/semok/bz10475.stp
@@ -0,0 +1,10 @@
+#! stap -p2
+// bz10475: pointer-array confused about array element size
+
+// struct file *do_filp_open(int dfd, const char *pathname,
+//                           int open_flag, int mode, int acc_mode)
+probe kernel.function("do_filp_open")
+{
+    // check array access on a "complex" pointer type
+    println($pathname[0])
+}