gccrs: Stop autoderef of raw pointer types

It is unsafe to deref raw pointers during autoderef this adds a check to
stop autoderef early when we are about to try and deref pointers.

Fixes #2015

gcc/rust/ChangeLog:

	* typecheck/rust-autoderef.cc (AutoderefCycle::cycle): add check for pointers

Signed-off-by: Philip Herron <herron.philip@googlemail.com>

diff --git a/gcc/rust/typecheck/rust-autoderef.cc b/gcc/rust/typecheck/rust-autoderef.cc
index 9450cfaa068bae054bc8ff264031e19cdd2ce856..c70420a7c3010ac27ec5b72b5ea5d8ff8c8de35f 100644 (file)
--- a/gcc/rust/typecheck/rust-autoderef.cc
+++ b/gcc/rust/typecheck/rust-autoderef.cc
@@ -336,7 +336,6 @@ AutoderefCycle::cycle (TyTy::BaseType *receiver)
        return false;
 
       // try unsize
-
       Adjustment unsize = Adjuster::try_unsize_type (r);
       if (!unsize.is_error ())
        {
@@ -351,6 +350,13 @@ AutoderefCycle::cycle (TyTy::BaseType *receiver)
          adjustments.pop_back ();
        }
 
+      bool is_ptr = receiver->get_kind () == TyTy::TypeKind::POINTER;
+      if (is_ptr)
+       {
+         // deref of raw pointers is unsafe
+         return false;
+       }
+
       Adjustment deref
        = Adjuster::try_deref_type (r, Analysis::RustLangItem::ItemType::DEREF);
       if (!deref.is_error ())