Fix xmethods for gdb (#7009)

We noticed a few issues in the GDB xmethods scripts. This PR fixes them.

Author: NCKempke

sycl/gdb/libsycl.so-gdb.py

@@ -153,7 +153,7 @@ def get_arg_types(self):
 
 
 class AccessorMatcher(gdb.xmethod.XMethodMatcher):
-    """Entry point for sycl::_V1::accessor"""
+    """Entry point for sycl::_V1::(local_)accessor"""
 
     def __init__(self):
         gdb.xmethod.XMethodMatcher.__init__(self, "AccessorMatcher")
@@ -162,7 +162,7 @@ def match(self, class_type, method_name):
         if method_name != "operator[]":
             return None
 
-        result = re.match("^sycl::_V1::accessor<.+>$", class_type.tag)
+        result = re.match("^sycl::_V1::(?:local_)?accessor<.+>$", class_type.tag)
         if result is None:
             return None
 
@@ -249,8 +249,9 @@ def __call__(self, obj, *args):
             item_base = args[0]["localItem"]["MImpl"]
             item_base = self.ItemBase(item_base)
             index = item_base.get_linear_id()
-            return obj["Val"]["_M_t"]["_M_t"]["_M_head_impl"][index]
 
+            eval_string = "((" + str(obj.type) + ")" + str(obj) + ")->Val.get()"
+            return gdb.parse_and_eval(eval_string)[index]
 
 class PrivateMemoryMatcher(gdb.xmethod.XMethodMatcher):
     """Entry point for sycl::_V1::private_memory"""

sycl/include/sycl/accessor.hpp

@@ -1164,10 +1164,15 @@ class __SYCL_SPECIAL_CLASS __SYCL_TYPE(accessor) accessor :
   // The function references helper methods required by GDB pretty-printers
   void GDBMethodsAnchor() {
 #ifndef NDEBUG
+    const auto *this_const = this;
     (void)getMemoryRange();
+    (void)this_const->getMemoryRange();
     (void)getOffset();
+    (void)this_const->getOffset();
     (void)getPtr();
+    (void)this_const->getPtr();
     (void)getAccessRange();
+    (void)this_const->getAccessRange();
 #endif
   }
 
@@ -2439,8 +2444,11 @@ class __SYCL_SPECIAL_CLASS local_accessor_base :
   // The function references helper methods required by GDB pretty-printers
   void GDBMethodsAnchor() {
 #ifndef NDEBUG
+    const auto *this_const = this;
     (void)getSize();
+    (void)this_const->getSize();
     (void)getPtr();
+    (void)this_const->getPtr();
 #endif
   }