[PATCH 200/203] Remove EVAL_SKIP

[Tom Tromey <tom@tromey.com>]

EVAL_SKIP was needed in the old expression implementation due to its
linearized tree structure.  This is not needed in the new
implementation, because it is trivial to not evaluate a subexpression.
This patch removes the last vestiges of EVAL_SKIP.

gdb/ChangeLog
2021-01-01  Tom Tromey  <tom@tromey.com>

	* value.h (eval_skip_value): Don't declare.
	* opencl-lang.c (eval_opencl_assign): Update.
	* m2-lang.c (eval_op_m2_high, eval_op_m2_subscript): Update.
	* f-lang.c (eval_op_f_abs, eval_op_f_mod, eval_op_f_ceil)
	(eval_op_f_floor, eval_op_f_modulo, eval_op_f_cmplx): Remove.
	* expression.h (enum noside) <EVAL_SKIP>: Remove.
	* expop.h (typeof_operation::evaluate)
	(decltype_operation::evaluate, unop_addr_operation::evaluate)
	(unop_sizeof_operation::evaluate, assign_operation::evaluate)
	(cxx_cast_operation::evaluate): Update.
	* eval.c (eval_skip_value): Remove.
	(eval_op_scope, eval_op_var_entry_value)
	(eval_op_func_static_var, eval_op_string, eval_op_objc_selector)
	(eval_op_concat, eval_op_ternop, eval_op_structop_struct)
	(eval_op_structop_ptr, eval_op_member, eval_op_add, eval_op_sub)
	(eval_op_binary, eval_op_subscript, eval_op_equal)
	(eval_op_notequal, eval_op_less, eval_op_gtr, eval_op_geq)
	(eval_op_leq, eval_op_repeat, eval_op_plus, eval_op_neg)
	(eval_op_complement, eval_op_lognot, eval_op_ind)
	(eval_op_memval, eval_op_preinc, eval_op_predec)
	(eval_op_postinc, eval_op_postdec, eval_op_type)
	(eval_binop_assign_modify, eval_op_objc_msgcall)
	(eval_multi_subscript, logical_and_operation::evaluate)
	(logical_or_operation::evaluate, array_operation::evaluate)
	(operation::evaluate_for_cast)
	(var_msym_value_operation::evaluate_for_cast)
	(var_value_operation::evaluate_for_cast): Update.
	* c-lang.c (c_string_operation::evaluate): Update.
	* c-exp.h (objc_nsstring_operation::evaluate)
	(objc_selector_operation::evaluate): Update.
	* ada-lang.c (ada_assign_operation::evaluate)
	(eval_ternop_in_range, ada_unop_neg, ada_unop_in_range)
	(ada_atr_size): Update.
---
 gdb/ChangeLog     |  36 ++++++++++++++++
 gdb/ada-lang.c    |  16 ++-----
 gdb/c-exp.h       |   4 --
 gdb/c-lang.c      |  21 ++--------
 gdb/eval.c        | 103 ++++------------------------------------------
 gdb/expop.h       |  19 ++-------
 gdb/expression.h  |   3 --
 gdb/f-lang.c      |  12 ------
 gdb/m2-lang.c     |   4 +-
 gdb/opencl-lang.c |   2 +-
 gdb/value.h       |   2 -
 11 files changed, 57 insertions(+), 165 deletions(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 4331a063cb0..4ab9172cc81 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -9509,7 +9509,7 @@ ada_assign_operation::evaluate (struct type *expect_type,
   if (VALUE_LVAL (arg1) == lval_internalvar)
     type = NULL;
   value *arg2 = std::get<1> (m_storage)->evaluate (type, exp, noside);
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   if (VALUE_LVAL (arg1) == lval_internalvar)
     {
@@ -9843,9 +9843,6 @@ eval_ternop_in_range (struct type *expect_type, struct expression *exp,
 		      enum noside noside,
 		      value *arg1, value *arg2, value *arg3)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2);
   binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3);
   struct type *type = language_bool_type (exp->language_defn, exp->gdbarch);
@@ -9865,9 +9862,7 @@ ada_unop_neg (struct type *expect_type,
 	      enum noside noside, enum exp_opcode op,
 	      struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-  else if (ada_is_gnat_encoded_fixed_point_type (value_type (arg1)))
+  if (ada_is_gnat_encoded_fixed_point_type (value_type (arg1)))
     return value_cast (value_type (arg1), value_neg (arg1));
   else
     {
@@ -9884,9 +9879,6 @@ ada_unop_in_range (struct type *expect_type,
 		   enum noside noside, enum exp_opcode op,
 		   struct value *arg1, struct type *type)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   struct value *arg2, *arg3;
   switch (type->code ())
     {
@@ -9943,9 +9935,7 @@ ada_atr_size (struct type *expect_type,
   if (type->code () == TYPE_CODE_REF)
     type = TYPE_TARGET_TYPE (type);
 
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-  else if (noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return value_zero (builtin_type (exp->gdbarch)->builtin_int, not_lval);
   else
     return value_from_longest (builtin_type (exp->gdbarch)->builtin_int,
diff --git a/gdb/c-exp.h b/gdb/c-exp.h
index 0ce2bd6eb22..1a69b1c7960 100644
--- a/gdb/c-exp.h
+++ b/gdb/c-exp.h
@@ -74,8 +74,6 @@ class objc_nsstring_operation
 		   struct expression *exp,
 		   enum noside noside) override
   {
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
     const std::string &str = std::get<0> (m_storage);
     return value_nsstring (exp->gdbarch, str.c_str (), str.size () + 1);
   }
@@ -95,8 +93,6 @@ class objc_selector_operation
 		   struct expression *exp,
 		   enum noside noside) override
   {
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
     return eval_op_objc_selector (expect_type, exp, noside,
 				  std::get<0> (m_storage).c_str ());
   }
diff --git a/gdb/c-lang.c b/gdb/c-lang.c
index 5dd27329726..36fc4fcad5c 100644
--- a/gdb/c-lang.c
+++ b/gdb/c-lang.c
@@ -638,24 +638,9 @@ c_string_operation::evaluate (struct type *expect_type,
 
   dest_charset = charset_for_string_type (dest_type, exp->gdbarch);
 
-  if (noside != EVAL_SKIP)
-    {
-      for (const std::string &item : std::get<1> (m_storage))
-	parse_one_string (&output, item.c_str (), item.size (),
-			  dest_charset, type);
-    }
-
-  if (noside == EVAL_SKIP)
-    {
-      /* Return a dummy value of the appropriate type.  */
-      if (expect_type != NULL)
-	result = allocate_value (expect_type);
-      else if ((dest_type & C_CHAR) != 0)
-	result = allocate_value (type);
-      else
-	result = value_cstring ("", 0, type);
-      return result;
-    }
+  for (const std::string &item : std::get<1> (m_storage))
+    parse_one_string (&output, item.c_str (), item.size (),
+		      dest_charset, type);
 
   if ((dest_type & C_CHAR) != 0)
     {
diff --git a/gdb/eval.c b/gdb/eval.c
index 4d467cd436d..49e53f930b9 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -603,14 +603,6 @@ evaluate_var_msym_value (enum noside noside,
     return value_at_lazy (the_type, address);
 }
 
-/* Helper for returning a value when handling EVAL_SKIP.  */
-
-value *
-eval_skip_value (expression *exp)
-{
-  return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
-}
-
 /* See expression.h.  */
 
 value *
@@ -984,8 +976,6 @@ eval_op_scope (struct type *expect_type, struct expression *exp,
 	       enum noside noside,
 	       struct type *type, const char *string)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct value *arg1 = value_aggregate_elt (type, string, expect_type,
 					    0, noside);
   if (arg1 == NULL)
@@ -999,8 +989,6 @@ struct value *
 eval_op_var_entry_value (struct type *expect_type, struct expression *exp,
 			 enum noside noside, symbol *sym)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return value_zero (SYMBOL_TYPE (sym), not_lval);
 
@@ -1032,8 +1020,6 @@ eval_op_func_static_var (struct type *expect_type, struct expression *exp,
 			 enum noside noside,
 			 value *func, const char *var)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   CORE_ADDR addr = value_address (func);
   const block *blk = block_for_pc (addr);
   struct block_symbol sym = lookup_symbol (var, blk, VAR_DOMAIN, NULL);
@@ -1074,8 +1060,6 @@ struct value *
 eval_op_string (struct type *expect_type, struct expression *exp,
 		enum noside noside, int len, const char *string)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = language_string_char_type (exp->language_defn,
 						 exp->gdbarch);
   return value_string (string, len, type);
@@ -1086,9 +1070,6 @@ eval_op_objc_selector (struct type *expect_type, struct expression *exp,
 		       enum noside noside,
 		       const char *sel)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   struct type *selector_type = builtin_type (exp->gdbarch)->builtin_data_ptr;
   return value_from_longest (selector_type,
 			     lookup_child_selector (exp->gdbarch, sel));
@@ -1098,8 +1079,6 @@ struct value *
 eval_op_concat (struct type *expect_type, struct expression *exp,
 		enum noside noside, struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (BINOP_CONCAT, arg1, arg2))
     return value_x_binop (arg1, arg2, BINOP_CONCAT, OP_NULL, noside);
   else
@@ -1113,8 +1092,6 @@ eval_op_ternop (struct type *expect_type, struct expression *exp,
 		enum noside noside,
 		struct value *array, struct value *low, struct value *upper)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   int lowbound = value_as_long (low);
   int upperbound = value_as_long (upper);
   return value_slice (array, lowbound, upperbound - lowbound + 1);
@@ -1127,8 +1104,6 @@ eval_op_structop_struct (struct type *expect_type, struct expression *exp,
 			 enum noside noside,
 			 struct value *arg1, const char *string)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct value *arg3 = value_struct_elt (&arg1, NULL, string,
 					 NULL, "structure");
   if (noside == EVAL_AVOID_SIDE_EFFECTS)
@@ -1143,9 +1118,6 @@ eval_op_structop_ptr (struct type *expect_type, struct expression *exp,
 		      enum noside noside,
 		      struct value *arg1, const char *string)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   /* Check to see if operator '->' has been overloaded.  If so replace
      arg1 with the value returned by evaluating operator->().  */
   while (unop_user_defined_p (STRUCTOP_PTR, arg1))
@@ -1204,9 +1176,6 @@ eval_op_member (struct type *expect_type, struct expression *exp,
 {
   long mem_offset;
 
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   struct value *arg3;
   struct type *type = check_typedef (value_type (arg2));
   switch (type->code ())
@@ -1245,8 +1214,6 @@ eval_op_add (struct type *expect_type, struct expression *exp,
 	     enum noside noside,
 	     struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (BINOP_ADD, arg1, arg2))
     return value_x_binop (arg1, arg2, BINOP_ADD, OP_NULL, noside);
   else if (ptrmath_type_p (exp->language_defn, value_type (arg1))
@@ -1269,8 +1236,6 @@ eval_op_sub (struct type *expect_type, struct expression *exp,
 	     enum noside noside,
 	     struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (BINOP_SUB, arg1, arg2))
     return value_x_binop (arg1, arg2, BINOP_SUB, OP_NULL, noside);
   else if (ptrmath_type_p (exp->language_defn, value_type (arg1))
@@ -1297,8 +1262,6 @@ eval_op_binary (struct type *expect_type, struct expression *exp,
 		enum noside noside, enum exp_opcode op,
 		struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     return value_x_binop (arg1, arg2, op, OP_NULL, noside);
   else
@@ -1344,8 +1307,6 @@ eval_op_subscript (struct type *expect_type, struct expression *exp,
 		   enum noside noside, enum exp_opcode op,
 		   struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     return value_x_binop (arg1, arg2, op, OP_NULL, noside);
   else
@@ -1380,8 +1341,6 @@ eval_op_equal (struct type *expect_type, struct expression *exp,
 	       enum noside noside, enum exp_opcode op,
 	       struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     {
       return value_x_binop (arg1, arg2, op, OP_NULL, noside);
@@ -1403,8 +1362,6 @@ eval_op_notequal (struct type *expect_type, struct expression *exp,
 		  enum noside noside, enum exp_opcode op,
 		  struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     {
       return value_x_binop (arg1, arg2, op, OP_NULL, noside);
@@ -1426,8 +1383,6 @@ eval_op_less (struct type *expect_type, struct expression *exp,
 	      enum noside noside, enum exp_opcode op,
 	      struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     {
       return value_x_binop (arg1, arg2, op, OP_NULL, noside);
@@ -1449,8 +1404,6 @@ eval_op_gtr (struct type *expect_type, struct expression *exp,
 	     enum noside noside, enum exp_opcode op,
 	     struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     {
       return value_x_binop (arg1, arg2, op, OP_NULL, noside);
@@ -1472,8 +1425,6 @@ eval_op_geq (struct type *expect_type, struct expression *exp,
 	     enum noside noside, enum exp_opcode op,
 	     struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     {
       return value_x_binop (arg1, arg2, op, OP_NULL, noside);
@@ -1495,8 +1446,6 @@ eval_op_leq (struct type *expect_type, struct expression *exp,
 	     enum noside noside, enum exp_opcode op,
 	     struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (binop_user_defined_p (op, arg1, arg2))
     {
       return value_x_binop (arg1, arg2, op, OP_NULL, noside);
@@ -1518,8 +1467,6 @@ eval_op_repeat (struct type *expect_type, struct expression *exp,
 		enum noside noside, enum exp_opcode op,
 		struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = check_typedef (value_type (arg2));
   if (type->code () != TYPE_CODE_INT
       && type->code () != TYPE_CODE_ENUM)
@@ -1540,8 +1487,6 @@ eval_op_plus (struct type *expect_type, struct expression *exp,
 	      enum noside noside, enum exp_opcode op,
 	      struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (unop_user_defined_p (op, arg1))
     return value_x_unop (arg1, op, noside);
   else
@@ -1558,8 +1503,6 @@ eval_op_neg (struct type *expect_type, struct expression *exp,
 	     enum noside noside, enum exp_opcode op,
 	     struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (unop_user_defined_p (op, arg1))
     return value_x_unop (arg1, op, noside);
   else
@@ -1576,8 +1519,6 @@ eval_op_complement (struct type *expect_type, struct expression *exp,
 		    enum noside noside, enum exp_opcode op,
 		    struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (unop_user_defined_p (UNOP_COMPLEMENT, arg1))
     return value_x_unop (arg1, UNOP_COMPLEMENT, noside);
   else
@@ -1594,8 +1535,6 @@ eval_op_lognot (struct type *expect_type, struct expression *exp,
 		enum noside noside, enum exp_opcode op,
 		struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (unop_user_defined_p (op, arg1))
     return value_x_unop (arg1, op, noside);
   else
@@ -1618,8 +1557,6 @@ eval_op_ind (struct type *expect_type, struct expression *exp,
       || type->code () == TYPE_CODE_MEMBERPTR)
     error (_("Attempt to dereference pointer "
 	     "to member without an object"));
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (unop_user_defined_p (UNOP_IND, arg1))
     return value_x_unop (arg1, UNOP_IND, noside);
   else if (noside == EVAL_AVOID_SIDE_EFFECTS)
@@ -1673,8 +1610,6 @@ eval_op_memval (struct type *expect_type, struct expression *exp,
 		enum noside noside,
 		struct value *arg1, struct type *type)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return value_zero (type, lval_memory);
   else
@@ -1688,7 +1623,7 @@ eval_op_preinc (struct type *expect_type, struct expression *exp,
 		enum noside noside, enum exp_opcode op,
 		struct value *arg1)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   else if (unop_user_defined_p (op, arg1))
     {
@@ -1719,7 +1654,7 @@ eval_op_predec (struct type *expect_type, struct expression *exp,
 		enum noside noside, enum exp_opcode op,
 		struct value *arg1)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   else if (unop_user_defined_p (op, arg1))
     {
@@ -1750,7 +1685,7 @@ eval_op_postinc (struct type *expect_type, struct expression *exp,
 		 enum noside noside, enum exp_opcode op,
 		 struct value *arg1)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   else if (unop_user_defined_p (op, arg1))
     {
@@ -1784,7 +1719,7 @@ eval_op_postdec (struct type *expect_type, struct expression *exp,
 		 enum noside noside, enum exp_opcode op,
 		 struct value *arg1)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   else if (unop_user_defined_p (op, arg1))
     {
@@ -1817,9 +1752,7 @@ struct value *
 eval_op_type (struct type *expect_type, struct expression *exp,
 	      enum noside noside, struct type *type)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-  else if (noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return allocate_value (type);
   else
     error (_("Attempt to use a type name as an expression"));
@@ -1832,7 +1765,7 @@ eval_binop_assign_modify (struct type *expect_type, struct expression *exp,
 			  enum noside noside, enum exp_opcode op,
 			  struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   if (binop_user_defined_p (op, arg1, arg2))
     return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside);
@@ -2082,8 +2015,6 @@ eval_op_objc_msgcall (struct type *expect_type, struct expression *exp,
 	called_method = msg_send;
     }
 
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
 
   if (noside == EVAL_AVOID_SIDE_EFFECTS)
     {
@@ -2139,8 +2070,6 @@ eval_multi_subscript (struct type *expect_type, struct expression *exp,
 		      enum noside noside, value *arg1,
 		      gdb::array_view<value *> args)
 {
-  if (noside == EVAL_SKIP)
-    return arg1;
   for (value *arg2 : args)
     {
       if (binop_user_defined_p (MULTI_SUBSCRIPT, arg1, arg2))
@@ -2228,8 +2157,6 @@ logical_and_operation::evaluate (struct type *expect_type,
 				 enum noside noside)
 {
   value *arg1 = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
 
   value *arg2 = std::get<1> (m_storage)->evaluate (nullptr, exp,
 						   EVAL_AVOID_SIDE_EFFECTS);
@@ -2259,8 +2186,6 @@ logical_or_operation::evaluate (struct type *expect_type,
 				enum noside noside)
 {
   value *arg1 = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
 
   value *arg2 = std::get<1> (m_storage)->evaluate (nullptr, exp,
 						   EVAL_AVOID_SIDE_EFFECTS);
@@ -2385,7 +2310,7 @@ array_operation::evaluate (struct type *expect_type,
   int nargs = tem3 - tem2 + 1;
   struct type *type = expect_type ? check_typedef (expect_type) : nullptr;
 
-  if (expect_type != nullptr && noside != EVAL_SKIP
+  if (expect_type != nullptr
       && type->code () == TYPE_CODE_STRUCT)
     {
       struct value *rec = allocate_value (expect_type);
@@ -2394,7 +2319,7 @@ array_operation::evaluate (struct type *expect_type,
       return evaluate_struct_tuple (rec, exp, noside, nargs);
     }
 
-  if (expect_type != nullptr && noside != EVAL_SKIP
+  if (expect_type != nullptr
       && type->code () == TYPE_CODE_ARRAY)
     {
       struct type *range_type = type->index_type ();
@@ -2430,7 +2355,7 @@ array_operation::evaluate (struct type *expect_type,
       return array;
     }
 
-  if (expect_type != nullptr && noside != EVAL_SKIP
+  if (expect_type != nullptr
       && type->code () == TYPE_CODE_SET)
     {
       struct value *set = allocate_value (expect_type);
@@ -2503,8 +2428,6 @@ array_operation::evaluate (struct type *expect_type,
 	 objects.  */
       argvec[tem] = in_args[tem]->evaluate_with_coercion (exp, noside);
     }
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   return value_array (tem2, tem3, argvec);
 }
 
@@ -2543,8 +2466,6 @@ operation::evaluate_for_cast (struct type *expect_type,
 			      enum noside noside)
 {
   value *val = evaluate (expect_type, exp, noside);
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   return value_cast (expect_type, val);
 }
 
@@ -2810,9 +2731,6 @@ var_msym_value_operation::evaluate_for_cast (struct type *to_type,
 					std::get<1> (m_storage),
 					std::get<0> (m_storage));
 
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   val = value_cast (to_type, val);
 
   /* Don't allow e.g. '&(int)var_with_no_debug_info'.  */
@@ -2834,9 +2752,6 @@ var_value_operation::evaluate_for_cast (struct type *to_type,
 				   std::get<1> (m_storage),
 				   std::get<0> (m_storage));
 
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
-
   val = value_cast (to_type, val);
 
   /* Don't allow e.g. '&(int)var_with_no_debug_info'.  */
diff --git a/gdb/expop.h b/gdb/expop.h
index 7449ef60562..0abe6dac90b 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -1569,9 +1569,7 @@ class typeof_operation
 		   struct expression *exp,
 		   enum noside noside) override
   {
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
-    else if (noside == EVAL_AVOID_SIDE_EFFECTS)
+    if (noside == EVAL_AVOID_SIDE_EFFECTS)
       return std::get<0> (m_storage)->evaluate (nullptr, exp,
 						EVAL_AVOID_SIDE_EFFECTS);
     else
@@ -1594,9 +1592,7 @@ class decltype_operation
 		   struct expression *exp,
 		   enum noside noside) override
   {
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
-    else if (noside == EVAL_AVOID_SIDE_EFFECTS)
+    if (noside == EVAL_AVOID_SIDE_EFFECTS)
       {
 	value *result
 	  = std::get<0> (m_storage)->evaluate (nullptr, exp,
@@ -1671,10 +1667,7 @@ class unop_addr_operation
 		   enum noside noside) override
   {
     /* C++: check for and handle pointer to members.  */
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
-    else
-      return std::get<0> (m_storage)->evaluate_for_address (exp, noside);
+    return std::get<0> (m_storage)->evaluate_for_address (exp, noside);
   }
 
   enum exp_opcode opcode () const override
@@ -1706,8 +1699,6 @@ class unop_sizeof_operation
 		   struct expression *exp,
 		   enum noside noside) override
   {
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
     return std::get<0> (m_storage)->evaluate_for_sizeof (exp, noside);
   }
 
@@ -1890,7 +1881,7 @@ class assign_operation
 			  : value_type (lhs));
     value *rhs = std::get<1> (m_storage)->evaluate (xtype, exp, noside);
 
-    if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+    if (noside == EVAL_AVOID_SIDE_EFFECTS)
       return lhs;
     if (binop_user_defined_p (BINOP_ASSIGN, lhs, rhs))
       return value_x_binop (lhs, rhs, BINOP_ASSIGN, OP_NULL, noside);
@@ -2031,8 +2022,6 @@ class cxx_cast_operation
 						    EVAL_AVOID_SIDE_EFFECTS);
     struct type *type = value_type (val);
     value *rhs = std::get<1> (m_storage)->evaluate (type, exp, noside);
-    if (noside == EVAL_SKIP)
-      return eval_skip_value (exp);
     return FUNC (type, rhs);
   }
 
diff --git a/gdb/expression.h b/gdb/expression.h
index 83bfe753d84..244f4e8ad33 100644
--- a/gdb/expression.h
+++ b/gdb/expression.h
@@ -54,9 +54,6 @@ enum exp_opcode : uint8_t
 enum noside
   {
     EVAL_NORMAL,
-    EVAL_SKIP,			/* Only effect is to increment pos.
-				   Return type information where
-				   possible.  */
     EVAL_AVOID_SIDE_EFFECTS	/* Don't modify any variables or
 				   call any functions.  The value
 				   returned will have the correct
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index f86f961e7bb..bf828d536f3 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -272,8 +272,6 @@ eval_op_f_abs (struct type *expect_type, struct expression *exp,
 	       enum exp_opcode opcode,
 	       struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = value_type (arg1);
   switch (type->code ())
     {
@@ -302,8 +300,6 @@ eval_op_f_mod (struct type *expect_type, struct expression *exp,
 	       enum exp_opcode opcode,
 	       struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = value_type (arg1);
   if (type->code () != value_type (arg2)->code ())
     error (_("non-matching types for parameters to MOD ()"));
@@ -341,8 +337,6 @@ eval_op_f_ceil (struct type *expect_type, struct expression *exp,
 		enum exp_opcode opcode,
 		struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = value_type (arg1);
   if (type->code () != TYPE_CODE_FLT)
     error (_("argument to CEILING must be of type float"));
@@ -361,8 +355,6 @@ eval_op_f_floor (struct type *expect_type, struct expression *exp,
 		 enum exp_opcode opcode,
 		 struct value *arg1)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = value_type (arg1);
   if (type->code () != TYPE_CODE_FLT)
     error (_("argument to FLOOR must be of type float"));
@@ -381,8 +373,6 @@ eval_op_f_modulo (struct type *expect_type, struct expression *exp,
 		  enum exp_opcode opcode,
 		  struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = value_type (arg1);
   if (type->code () != value_type (arg2)->code ())
     error (_("non-matching types for parameters to MODULO ()"));
@@ -423,8 +413,6 @@ eval_op_f_cmplx (struct type *expect_type, struct expression *exp,
 		 enum exp_opcode opcode,
 		 struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   struct type *type = builtin_f_type(exp->gdbarch)->builtin_complex_s16;
   return value_literal_complex (arg1, arg2, type);
 }
diff --git a/gdb/m2-lang.c b/gdb/m2-lang.c
index a165cf6b603..6f6192937a4 100644
--- a/gdb/m2-lang.c
+++ b/gdb/m2-lang.c
@@ -37,7 +37,7 @@ eval_op_m2_high (struct type *expect_type, struct expression *exp,
 		 enum noside noside,
 		 struct value *arg1)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
   else
     {
@@ -68,8 +68,6 @@ eval_op_m2_subscript (struct type *expect_type, struct expression *exp,
 		      enum noside noside,
 		      struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP)
-    return eval_skip_value (exp);
   /* If the user attempts to subscript something that is not an
      array or pointer type (like a plain int variable for example),
      then report this as an error.  */
diff --git a/gdb/opencl-lang.c b/gdb/opencl-lang.c
index c168cd49344..1d6117a9285 100644
--- a/gdb/opencl-lang.c
+++ b/gdb/opencl-lang.c
@@ -681,7 +681,7 @@ eval_opencl_assign (struct type *expect_type, struct expression *exp,
 		    enum noside noside, enum exp_opcode op,
 		    struct value *arg1, struct value *arg2)
 {
-  if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
+  if (noside == EVAL_AVOID_SIDE_EFFECTS)
     return arg1;
 
   struct type *type1 = value_type (arg1);
diff --git a/gdb/value.h b/gdb/value.h
index 88995cfeafe..59036b070aa 100644
--- a/gdb/value.h
+++ b/gdb/value.h
@@ -923,8 +923,6 @@ extern value *evaluate_var_msym_value (enum noside noside,
 				       struct objfile *objfile,
 				       minimal_symbol *msymbol);
 
-extern value *eval_skip_value (expression *exp);
-
 namespace expr { class operation; };
 extern void fetch_subexp_value (struct expression *exp,
 				expr::operation *op,
-- 
2.26.2