Change {lookup,make}_reference_type API

Parameterize lookup_reference_type() and make_reference_type() by the kind of
reference type we want to look up. Create two wrapper functions
lookup_{lvalue,rvalue}_reference_type() for lookup_reference_type() to simplify
the API. Change all callers to use the new API.

gdb/Changelog

	PR gdb/14441
	* dwarf2read.c (read_tag_reference_type): Use
	lookup_lvalue_reference_type() instead of lookup_reference_type().
	* eval.c (evaluate_subexp_standard): Likewise.
	* f-exp.y: Likewise.
	* gdbtypes.c (make_reference_type, lookup_reference_type):
	Generalize with rvalue reference types.
	(lookup_lvalue_reference_type, lookup_rvalue_reference_type): New
	convenience wrappers for lookup_reference_type().
	* gdbtypes.h (make_reference_type, lookup_reference_type): Add a
	reference kind parameter.
	(lookup_lvalue_reference_type, lookup_rvalue_reference_type): Add
	wrappers for lookup_reference_type().
	* guile/scm-type.c (gdbscm_type_reference): Use
	lookup_lvalue_reference_type() instead of lookup_reference_type().
	* guile/scm-value.c (gdbscm_value_dynamic_type): Likewise.
	* parse.c (follow_types): Likewise.
	* python/py-type.c (typy_reference, typy_lookup_type): Likewise.
	* python/py-value.c (valpy_get_dynamic_type, valpy_getitem):
	Likewise.
	* python/py-xmethods.c (gdbpy_get_xmethod_result_type)
	(gdbpy_invoke_xmethod): Likewise.
	* stabsread.c: Provide extra argument to make_reference_type()
	call.
	* valops.c (value_ref, value_rtti_indirect_type): Use
	lookup_lvalue_reference_type() instead of lookup_reference_type().

14 files changed, 85 insertions, 26 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ff09df0..872f661 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,6 +1,35 @@
 2017-03-20  Artemiy Volkov  <artemiyv@acm.org>
 
 	PR gdb/14441
+	* dwarf2read.c (read_tag_reference_type): Use
+	lookup_lvalue_reference_type() instead of lookup_reference_type().
+	* eval.c (evaluate_subexp_standard): Likewise.
+	* f-exp.y: Likewise.
+	* gdbtypes.c (make_reference_type, lookup_reference_type):
+	Generalize with rvalue reference types.
+	(lookup_lvalue_reference_type, lookup_rvalue_reference_type): New
+	convenience wrappers for lookup_reference_type().
+	* gdbtypes.h (make_reference_type, lookup_reference_type): Add a
+	reference kind parameter.
+	(lookup_lvalue_reference_type, lookup_rvalue_reference_type): Add
+	wrappers for lookup_reference_type().
+	* guile/scm-type.c (gdbscm_type_reference): Use
+	lookup_lvalue_reference_type() instead of lookup_reference_type().
+	* guile/scm-value.c (gdbscm_value_dynamic_type): Likewise.
+	* parse.c (follow_types): Likewise.
+	* python/py-type.c (typy_reference, typy_lookup_type): Likewise.
+	* python/py-value.c (valpy_get_dynamic_type, valpy_getitem):
+	Likewise.
+	* python/py-xmethods.c (gdbpy_get_xmethod_result_type)
+	(gdbpy_invoke_xmethod): Likewise.
+	* stabsread.c: Provide extra argument to make_reference_type()
+	call.
+	* valops.c (value_ref, value_rtti_indirect_type): Use
+	lookup_lvalue_reference_type() instead of lookup_reference_type().
+
+2017-03-20  Artemiy Volkov  <artemiyv@acm.org>
+
+	PR gdb/14441
 	* gdbtypes.h (enum type_code) <TYPE_CODE_RVALUE_REF>: New constant.
 	(TYPE_IS_REFERENCE): New macro.
 	(struct type): Add rvalue_reference_type field.
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index da70884..3fb843a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -14584,7 +14584,7 @@ read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
   if (type)
     return type;
 
-  type = lookup_reference_type (target_type);
+  type = lookup_lvalue_reference_type (target_type);
   attr = dwarf2_attr (die, DW_AT_byte_size, cu);
   if (attr)
     {
diff --git a/gdb/eval.c b/gdb/eval.c
index 76d7f73..61d8d19 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -2771,7 +2771,7 @@ evaluate_subexp_standard (struct type *expect_type,
 
 	      if (TYPE_CODE (check_typedef (type)) != TYPE_CODE_REF)
 		{
-		  type = lookup_reference_type (type);
+		  type = lookup_lvalue_reference_type (type);
 		  result = allocate_value (type);
 		}
 	    }
diff --git a/gdb/f-exp.y b/gdb/f-exp.y
index a791d2c..49d797d 100644
--- a/gdb/f-exp.y
+++ b/gdb/f-exp.y
@@ -513,7 +513,7 @@ ptype	:	typebase
 			follow_type = lookup_pointer_type (follow_type);
 			break;
 		      case tp_reference:
-			follow_type = lookup_reference_type (follow_type);
+			follow_type = lookup_lvalue_reference_type (follow_type);
 			break;
 		      case tp_array:
 			array_size = pop_type_int ();
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 5e5db27..60cef68 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -384,15 +384,21 @@ lookup_pointer_type (struct type *type)
 /* Lookup a C++ `reference' to a type TYPE.  TYPEPTR, if nonzero,
    points to a pointer to memory where the reference type should be
    stored.  If *TYPEPTR is zero, update it to point to the reference
-   type we return.  We allocate new memory if needed.  */
+   type we return.  We allocate new memory if needed. REFCODE denotes
+   the kind of reference type to lookup (lvalue or rvalue reference).  */
 
 struct type *
-make_reference_type (struct type *type, struct type **typeptr)
+make_reference_type (struct type *type, struct type **typeptr,
+                      enum type_code refcode)
 {
   struct type *ntype;	/* New type */
+  struct type **reftype;
   struct type *chain;
 
-  ntype = TYPE_REFERENCE_TYPE (type);
+  gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
+
+  ntype = (refcode == TYPE_CODE_REF ? TYPE_REFERENCE_TYPE (type)
+           : TYPE_RVALUE_REFERENCE_TYPE (type));
 
   if (ntype)
     {
@@ -421,7 +427,10 @@ make_reference_type (struct type *type, struct type **typeptr)
     }
 
   TYPE_TARGET_TYPE (ntype) = type;
-  TYPE_REFERENCE_TYPE (type) = ntype;
+  reftype = (refcode == TYPE_CODE_REF ? &TYPE_REFERENCE_TYPE (type)
+             : &TYPE_RVALUE_REFERENCE_TYPE (type));
+
+  *reftype = ntype;
 
   /* FIXME!  Assume the machine has only one representation for
      references, and that it matches the (only) representation for
@@ -429,10 +438,9 @@ make_reference_type (struct type *type, struct type **typeptr)
 
   TYPE_LENGTH (ntype) =
     gdbarch_ptr_bit (get_type_arch (type)) / TARGET_CHAR_BIT;
-  TYPE_CODE (ntype) = TYPE_CODE_REF;
+  TYPE_CODE (ntype) = refcode;
 
-  if (!TYPE_REFERENCE_TYPE (type))	/* Remember it, if don't have one.  */
-    TYPE_REFERENCE_TYPE (type) = ntype;
+  *reftype = ntype;
 
   /* Update the length of all the other variants of this type.  */
   chain = TYPE_CHAIN (ntype);
@@ -449,9 +457,25 @@ make_reference_type (struct type *type, struct type **typeptr)
    details.  */
 
 struct type *
-lookup_reference_type (struct type *type)
+lookup_reference_type (struct type *type, enum type_code refcode)
+{
+  return make_reference_type (type, (struct type **) 0, refcode);
+}
+
+/* Lookup the lvalue reference type for the type TYPE.  */
+
+struct type *
+lookup_lvalue_reference_type (struct type *type)
+{
+  return lookup_reference_type (type, TYPE_CODE_REF);
+}
+
+/* Lookup the rvalue reference type for the type TYPE.  */
+
+struct type *
+lookup_rvalue_reference_type (struct type *type)
 {
-  return make_reference_type (type, (struct type **) 0);
+  return lookup_reference_type (type, TYPE_CODE_RVALUE_REF);
 }
 
 /* Lookup a function type that returns type TYPE.  TYPEPTR, if
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index 7d107fa..4abeaf3 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -1714,9 +1714,13 @@ extern void append_flags_type_flag (struct type *type, int bitpos,
 extern void make_vector_type (struct type *array_type);
 extern struct type *init_vector_type (struct type *elt_type, int n);
 
-extern struct type *lookup_reference_type (struct type *);
+extern struct type *lookup_reference_type (struct type *, enum type_code);
+extern struct type *lookup_lvalue_reference_type (struct type *);
+extern struct type *lookup_rvalue_reference_type (struct type *);
 
-extern struct type *make_reference_type (struct type *, struct type **);
+
+extern struct type *make_reference_type (struct type *, struct type **,
+                                         enum type_code);
 
 extern struct type *make_cv_type (int, int, struct type *, struct type **);
 
diff --git a/gdb/guile/scm-type.c b/gdb/guile/scm-type.c
index b3036ad..704be88 100644
--- a/gdb/guile/scm-type.c
+++ b/gdb/guile/scm-type.c
@@ -845,7 +845,7 @@ gdbscm_type_reference (SCM self)
 
   TRY
     {
-      type = lookup_reference_type (type);
+      type = lookup_lvalue_reference_type (type);
     }
   CATCH (except, RETURN_MASK_ALL)
     {
diff --git a/gdb/guile/scm-value.c b/gdb/guile/scm-value.c
index f81a90c..f631032 100644
--- a/gdb/guile/scm-value.c
+++ b/gdb/guile/scm-value.c
@@ -591,7 +591,7 @@ gdbscm_value_dynamic_type (SCM self)
 	      if (was_pointer)
 		type = lookup_pointer_type (type);
 	      else
-		type = lookup_reference_type (type);
+		type = lookup_lvalue_reference_type (type);
 	    }
 	}
       else if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
diff --git a/gdb/parse.c b/gdb/parse.c
index e6f6805..23c636f 100644
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -1686,7 +1686,7 @@ follow_types (struct type *follow_type)
 	make_addr_space = 0;
 	break;
       case tp_reference:
-	follow_type = lookup_reference_type (follow_type);
+	follow_type = lookup_lvalue_reference_type (follow_type);
 	if (make_const)
 	  follow_type = make_cv_type (make_const, 
 				      TYPE_VOLATILE (follow_type), 
diff --git a/gdb/python/py-type.c b/gdb/python/py-type.c
index d3506ca..c4d5917 100644
--- a/gdb/python/py-type.c
+++ b/gdb/python/py-type.c
@@ -626,7 +626,7 @@ typy_reference (PyObject *self, PyObject *args)
 
   TRY
     {
-      type = lookup_reference_type (type);
+      type = lookup_lvalue_reference_type (type);
     }
   CATCH (except, RETURN_MASK_ALL)
     {
@@ -786,7 +786,7 @@ typy_lookup_type (struct demangle_component *demangled,
 	  switch (demangled_type)
 	    {
 	    case DEMANGLE_COMPONENT_REFERENCE:
-	      rtype =  lookup_reference_type (type);
+	      rtype = lookup_lvalue_reference_type (type);
 	      break;
 	    case DEMANGLE_COMPONENT_POINTER:
 	      rtype = lookup_pointer_type (type);
diff --git a/gdb/python/py-value.c b/gdb/python/py-value.c
index 124d398..a56e555 100644
--- a/gdb/python/py-value.c
+++ b/gdb/python/py-value.c
@@ -369,7 +369,7 @@ valpy_get_dynamic_type (PyObject *self, void *closure)
 	      if (was_pointer)
 		type = lookup_pointer_type (type);
 	      else
-		type = lookup_reference_type (type);
+		type = lookup_lvalue_reference_type (type);
 	    }
 	}
       else if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
@@ -801,7 +801,8 @@ valpy_getitem (PyObject *self, PyObject *key)
 	  if (TYPE_CODE (val_type) == TYPE_CODE_PTR)
 	    res_val = value_cast (lookup_pointer_type (base_class_type), tmp);
 	  else if (TYPE_CODE (val_type) == TYPE_CODE_REF)
-	    res_val = value_cast (lookup_reference_type (base_class_type), tmp);
+	    res_val = value_cast (lookup_lvalue_reference_type (base_class_type),
+	                          tmp);
 	  else
 	    res_val = value_cast (base_class_type, tmp);
 	}
diff --git a/gdb/python/py-xmethods.c b/gdb/python/py-xmethods.c
index d293c71..8a9bb9b 100644
--- a/gdb/python/py-xmethods.c
+++ b/gdb/python/py-xmethods.c
@@ -466,7 +466,7 @@ gdbpy_get_xmethod_result_type (const struct extension_language_defn *extlang,
     }
   else if (TYPE_CODE (obj_type) == TYPE_CODE_REF)
     {
-      struct type *this_ref = lookup_reference_type (this_type);
+      struct type *this_ref = lookup_lvalue_reference_type (this_type);
 
       if (!types_equal (obj_type, this_ref))
 	obj = value_cast (this_ref, obj);
@@ -554,7 +554,7 @@ gdbpy_invoke_xmethod (const struct extension_language_defn *extlang,
     }
   else if (TYPE_CODE (obj_type) == TYPE_CODE_REF)
     {
-      struct type *this_ref = lookup_reference_type (this_type);
+      struct type *this_ref = lookup_lvalue_reference_type (this_type);
 
       if (!types_equal (obj_type, this_ref))
 	obj = value_cast (this_ref, obj);
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index da7241a..1412202 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -1794,7 +1794,8 @@ again:
 
     case '&':			/* Reference to another type */
       type1 = read_type (pp, objfile);
-      type = make_reference_type (type1, dbx_lookup_type (typenums, objfile));
+      type = make_reference_type (type1, dbx_lookup_type (typenums, objfile),
+                                  TYPE_CODE_REF);
       break;
 
     case 'f':			/* Function returning another type */
diff --git a/gdb/valops.c b/gdb/valops.c
index fa25ff9..d218c92 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -1536,7 +1536,7 @@ value_ref (struct value *arg1)
     return arg1;
 
   arg2 = value_addr (arg1);
-  deprecated_set_value_type (arg2, lookup_reference_type (type));
+  deprecated_set_value_type (arg2, lookup_lvalue_reference_type (type));
   return arg2;
 }
 
@@ -3639,7 +3639,7 @@ value_rtti_indirect_type (struct value *v, int *full,
       real_type = make_cv_type (TYPE_CONST (target_type),
 				TYPE_VOLATILE (target_type), real_type, NULL);
       if (TYPE_CODE (type) == TYPE_CODE_REF)
-        real_type = lookup_reference_type (real_type);
+        real_type = lookup_lvalue_reference_type (real_type);
       else if (TYPE_CODE (type) == TYPE_CODE_PTR)
         real_type = lookup_pointer_type (real_type);
       else