Move get_object_address to dwarf_expr_context

Following the idea of merging the evaluators, the get_object_address
and can be moved from dwarf_expr_executor and dwarf_evaluate_loc_desc
classes to their base class dwarf_expr_context.

gdb/ChangeLog:

	* dwarf2/expr.c (dwarf_expr_context::get_object_address): Move
	from dwarf_evaluate_loc_desc.
	(class dwarf_expr_context): Add object address member to
	dwarf_expr_context.
	* dwarf2/expr.h (dwarf_expr_context::get_frame_pc): Remove
	method.
	* dwarf2/frame.c (dwarf_expr_executor::get_object_address):
	Remove method.
	* dwarf2/loc.c (dwarf_evaluate_loc_desc::get_object_address):
	move to dwarf_expr_context.
	(class dwarf_evaluate_loc_desc): Move object address member to
	dwarf_expr_context.

3 files changed, 9 insertions, 18 deletions

diff --git a/gdb/dwarf2/expr.h b/gdb/dwarf2/expr.h
index 52f5051..d10bf9c 100644
--- a/gdb/dwarf2/expr.h
+++ b/gdb/dwarf2/expr.h
@@ -188,6 +188,9 @@ struct dwarf_expr_context
   /* Compilation unit used for the evaluation.  */
   dwarf2_per_cu_data *per_cu = nullptr;
 
+  /* Object address used for the evaluation.  */
+  CORE_ADDR obj_address = 0;
+
   /* Read LENGTH bytes at ADDR into BUF.  */
   virtual void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t length) = 0;
 
@@ -200,7 +203,12 @@ struct dwarf_expr_context
 					   int deref_size) = 0;
 
   /* Return the `object address' for DW_OP_push_object_address.  */
-  virtual CORE_ADDR get_object_address () = 0;
+  virtual CORE_ADDR get_object_address ()
+  {
+    if (obj_address == 0)
+      error (_("Location address is not set."));
+    return obj_address;
+  }
 
 private:
 
diff --git a/gdb/dwarf2/frame.c b/gdb/dwarf2/frame.c
index 6aaad94..37d3a40 100644
--- a/gdb/dwarf2/frame.c
+++ b/gdb/dwarf2/frame.c
@@ -244,11 +244,6 @@ public:
     invalid ("DW_OP_entry_value");
   }
 
-  CORE_ADDR get_object_address () override
-  {
-    invalid ("DW_OP_push_object_address");
-  }
-
  private:
 
   void invalid (const char *op) ATTRIBUTE_NORETURN
diff --git a/gdb/dwarf2/loc.c b/gdb/dwarf2/loc.c
index e63b339..217d74c 100644
--- a/gdb/dwarf2/loc.c
+++ b/gdb/dwarf2/loc.c
@@ -674,18 +674,6 @@ public:
     : dwarf_expr_context (per_objfile)
   {}
 
-  CORE_ADDR obj_address;
-
-  /* Callback function for get_object_address. Return the address of the VLA
-     object.  */
-
-  CORE_ADDR get_object_address () override
-  {
-    if (obj_address == 0)
-      error (_("Location address is not set."));
-    return obj_address;
-  }
-
   /* Execute DWARF block of call_site_parameter which matches KIND and
      KIND_U.  Choose DEREF_SIZE value of that parameter.  Search
      caller of this objects's frame.