[PATCH 178/203] Convert c-exp.y to use operations

[Tom Tromey <tom@tromey.com>]

This converts the C parser to generate operations rather than
exp_elements.

One test needed a tweak in order to handle the different debugging
output.

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

	* objc-lang.c (end_msglist): Create operations.
	* c-exp.y: Change parser to create operations.
	(write_destructor_name): Remove.
	(c_parse): Update.

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

	* gdb.base/debug-expr.exp: Update expected dump output.
---
 gdb/ChangeLog                         |   7 +
 gdb/c-exp.y                           | 656 ++++++++++++++------------
 gdb/objc-lang.c                       |  10 +-
 gdb/testsuite/ChangeLog               |   4 +
 gdb/testsuite/gdb.base/debug-expr.exp |   4 +-
 5 files changed, 371 insertions(+), 310 deletions(-)

diff --git a/gdb/c-exp.y b/gdb/c-exp.y
index 140881d1517..37a7f2c9e56 100644
--- a/gdb/c-exp.y
+++ b/gdb/c-exp.y
@@ -55,6 +55,7 @@
 #include "cp-abi.h"
 #include "type-stack.h"
 #include "target-float.h"
+#include "c-exp.h"
 
 #define parse_type(ps) builtin_type (ps->gdbarch ())
 
@@ -123,6 +124,7 @@ static void yyerror (const char *);
 
 static int type_aggregate_p (struct type *);
 
+using namespace expr;
 %}
 
 /* Although the yacc "value" of an expression is not used,
@@ -164,8 +166,6 @@ static int parse_number (struct parser_state *par_state,
 static struct stoken operator_stoken (const char *);
 static struct stoken typename_stoken (const char *);
 static void check_parameter_typelist (std::vector<struct type *> *);
-static void write_destructor_name (struct parser_state *par_state,
-				   struct stoken);
 
 #ifdef YYBISON
 static void c_print_token (FILE *file, int type, YYSTYPE value);
@@ -282,190 +282,213 @@ start   :	exp1
 	;
 
 type_exp:	type
-			{ write_exp_elt_opcode(pstate, OP_TYPE);
-			  write_exp_elt_type(pstate, $1);
-			  write_exp_elt_opcode(pstate, OP_TYPE);}
+			{
+			  pstate->push_new<type_operation> ($1);
+			}
 	|	TYPEOF '(' exp ')'
 			{
-			  write_exp_elt_opcode (pstate, OP_TYPEOF);
+			  pstate->wrap<typeof_operation> ();
 			}
 	|	TYPEOF '(' type ')'
 			{
-			  write_exp_elt_opcode (pstate, OP_TYPE);
-			  write_exp_elt_type (pstate, $3);
-			  write_exp_elt_opcode (pstate, OP_TYPE);
+			  pstate->push_new<type_operation> ($3);
 			}
 	|	DECLTYPE '(' exp ')'
 			{
-			  write_exp_elt_opcode (pstate, OP_DECLTYPE);
+			  pstate->wrap<decltype_operation> ();
 			}
 	;
 
 /* Expressions, including the comma operator.  */
 exp1	:	exp
 	|	exp1 ',' exp
-			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
+			{ pstate->wrap2<comma_operation> (); }
 	;
 
 /* Expressions, not including the comma operator.  */
 exp	:	'*' exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_IND); }
+			{ pstate->wrap<unop_ind_operation> (); }
 	;
 
 exp	:	'&' exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
+			{ pstate->wrap<unop_addr_operation> (); }
 	;
 
 exp	:	'-' exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
+			{ pstate->wrap<unary_neg_operation> (); }
 	;
 
 exp	:	'+' exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
+			{ pstate->wrap<unary_plus_operation> (); }
 	;
 
 exp	:	'!' exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap<opencl_not_operation> ();
+			  else
+			    pstate->wrap<unary_logical_not_operation> ();
+			}
 	;
 
 exp	:	'~' exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
+			{ pstate->wrap<unary_complement_operation> (); }
 	;
 
 exp	:	INCREMENT exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
+			{ pstate->wrap<preinc_operation> (); }
 	;
 
 exp	:	DECREMENT exp    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
+			{ pstate->wrap<predec_operation> (); }
 	;
 
 exp	:	exp INCREMENT    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
+			{ pstate->wrap<postinc_operation> (); }
 	;
 
 exp	:	exp DECREMENT    %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
+			{ pstate->wrap<postdec_operation> (); }
 	;
 
 exp	:	TYPEID '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (pstate, OP_TYPEID); }
+			{ pstate->wrap<typeid_operation> (); }
 	;
 
 exp	:	TYPEID '(' type_exp ')' %prec UNARY
-			{ write_exp_elt_opcode (pstate, OP_TYPEID); }
+			{ pstate->wrap<typeid_operation> (); }
 	;
 
 exp	:	SIZEOF exp       %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
+			{ pstate->wrap<unop_sizeof_operation> (); }
 	;
 
 exp	:	ALIGNOF '(' type_exp ')'	%prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_ALIGNOF); }
+			{ pstate->wrap<unop_alignof_operation> (); }
 	;
 
 exp	:	exp ARROW field_name
-			{ write_exp_elt_opcode (pstate, STRUCTOP_PTR);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
+			{
+			  pstate->push_new<structop_ptr_operation>
+			    (pstate->pop (), copy_name ($3));
+			}
 	;
 
 exp	:	exp ARROW field_name COMPLETE
-			{ pstate->mark_struct_expression ();
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
+			{
+			  structop_base_operation *op
+			    = new structop_ptr_operation (pstate->pop (),
+							  copy_name ($3));
+			  pstate->mark_struct_expression (op);
+			  pstate->push (operation_up (op));
+			}
 	;
 
 exp	:	exp ARROW COMPLETE
-			{ struct stoken s;
-			  pstate->mark_struct_expression ();
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR);
-			  s.ptr = "";
-			  s.length = 0;
-			  write_exp_string (pstate, s);
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
+			{
+			  structop_base_operation *op
+			    = new structop_ptr_operation (pstate->pop (), "");
+			  pstate->mark_struct_expression (op);
+			  pstate->push (operation_up (op));
+			}
 	;
 
 exp	:	exp ARROW '~' name
-			{ write_exp_elt_opcode (pstate, STRUCTOP_PTR);
-			  write_destructor_name (pstate, $4);
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
+			{
+			  pstate->push_new<structop_ptr_operation>
+			    (pstate->pop (), "~" + copy_name ($4));
+			}
 	;
 
 exp	:	exp ARROW '~' name COMPLETE
-			{ pstate->mark_struct_expression ();
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR);
-			  write_destructor_name (pstate, $4);
-			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
+			{
+			  structop_base_operation *op
+			    = new structop_ptr_operation (pstate->pop (),
+							  "~" + copy_name ($4));
+			  pstate->mark_struct_expression (op);
+			  pstate->push (operation_up (op));
+			}
 	;
 
 exp	:	exp ARROW qualified_name
 			{ /* exp->type::name becomes exp->*(&type::name) */
 			  /* Note: this doesn't work if name is a
 			     static member!  FIXME */
-			  write_exp_elt_opcode (pstate, UNOP_ADDR);
-			  write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
+			  pstate->wrap<unop_addr_operation> ();
+			  pstate->wrap2<structop_mptr_operation> (); }
 	;
 
 exp	:	exp ARROW_STAR exp
-			{ write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
+			{ pstate->wrap2<structop_mptr_operation> (); }
 	;
 
 exp	:	exp '.' field_name
-			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->push_new<opencl_structop_operation>
+			      (pstate->pop (), copy_name ($3));
+			  else
+			    pstate->push_new<structop_operation>
+			      (pstate->pop (), copy_name ($3));
+			}
 	;
 
 exp	:	exp '.' field_name COMPLETE
-			{ pstate->mark_struct_expression ();
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
+			{
+			  structop_base_operation *op
+			    = new structop_operation (pstate->pop (),
+						      copy_name ($3));
+			  pstate->mark_struct_expression (op);
+			  pstate->push (operation_up (op));
+			}
 	;
 
 exp	:	exp '.' COMPLETE
-			{ struct stoken s;
-			  pstate->mark_struct_expression ();
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
-			  s.ptr = "";
-			  s.length = 0;
-			  write_exp_string (pstate, s);
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
+			{
+			  structop_base_operation *op
+			    = new structop_operation (pstate->pop (), "");
+			  pstate->mark_struct_expression (op);
+			  pstate->push (operation_up (op));
+			}
 	;
 
 exp	:	exp '.' '~' name
-			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
-			  write_destructor_name (pstate, $4);
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
+			{
+			  pstate->push_new<structop_operation>
+			    (pstate->pop (), "~" + copy_name ($4));
+			}
 	;
 
 exp	:	exp '.' '~' name COMPLETE
-			{ pstate->mark_struct_expression ();
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
-			  write_destructor_name (pstate, $4);
-			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
+			{
+			  structop_base_operation *op
+			    = new structop_operation (pstate->pop (),
+						      "~" + copy_name ($4));
+			  pstate->mark_struct_expression (op);
+			  pstate->push (operation_up (op));
+			}
 	;
 
 exp	:	exp '.' qualified_name
 			{ /* exp.type::name becomes exp.*(&type::name) */
 			  /* Note: this doesn't work if name is a
 			     static member!  FIXME */
-			  write_exp_elt_opcode (pstate, UNOP_ADDR);
-			  write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
+			  pstate->wrap<unop_addr_operation> ();
+			  pstate->wrap2<structop_member_operation> (); }
 	;
 
 exp	:	exp DOT_STAR exp
-			{ write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
+			{ pstate->wrap2<structop_member_operation> (); }
 	;
 
 exp	:	exp '[' exp1 ']'
-			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
+			{ pstate->wrap2<subscript_operation> (); }
 	;
 
 exp	:	exp OBJC_LBRAC exp1 ']'
-			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
+			{ pstate->wrap2<subscript_operation> (); }
 	;
 
 /*
@@ -483,43 +506,30 @@ exp	: 	OBJC_LBRAC TYPENAME
 			  if (theclass == 0)
 			    error (_("%s is not an ObjC Class"),
 				   copy.c_str ());
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate,
-					      parse_type (pstate)->builtin_int);
-			  write_exp_elt_longcst (pstate, (LONGEST) theclass);
-			  write_exp_elt_opcode (pstate, OP_LONG);
+			  pstate->push_new<long_const_operation>
+			    (parse_type (pstate)->builtin_int,
+			     (LONGEST) theclass);
 			  start_msglist();
 			}
 		msglist ']'
-			{ write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
-			  end_msglist (pstate);
-			  write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
-			}
+			{ end_msglist (pstate); }
 	;
 
 exp	:	OBJC_LBRAC CLASSNAME
 			{
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate,
-					    parse_type (pstate)->builtin_int);
-			  write_exp_elt_longcst (pstate, (LONGEST) $2.theclass);
-			  write_exp_elt_opcode (pstate, OP_LONG);
+			  pstate->push_new<long_const_operation>
+			    (parse_type (pstate)->builtin_int,
+			     (LONGEST) $2.theclass);
 			  start_msglist();
 			}
 		msglist ']'
-			{ write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
-			  end_msglist (pstate);
-			  write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
-			}
+			{ end_msglist (pstate); }
 	;
 
 exp	:	OBJC_LBRAC exp
 			{ start_msglist(); }
 		msglist ']'
-			{ write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
-			  end_msglist (pstate);
-			  write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
-			}
+			{ end_msglist (pstate); }
 	;
 
 msglist :	name
@@ -544,21 +554,22 @@ exp	:	exp '('
 			   being accumulated by an outer function call.  */
 			{ pstate->start_arglist (); }
 		arglist ')'	%prec ARROW
-			{ write_exp_elt_opcode (pstate, OP_FUNCALL);
-			  write_exp_elt_longcst (pstate,
-						 pstate->end_arglist ());
-			  write_exp_elt_opcode (pstate, OP_FUNCALL); }
+			{
+			  std::vector<operation_up> args
+			    = pstate->pop_vector (pstate->end_arglist ());
+			  pstate->push_new<funcall_operation>
+			    (pstate->pop (), std::move (args));
+			}
 	;
 
 /* This is here to disambiguate with the production for
    "func()::static_var" further below, which uses
    function_method_void.  */
 exp	:	exp '(' ')' %prec ARROW
-			{ pstate->start_arglist ();
-			  write_exp_elt_opcode (pstate, OP_FUNCALL);
-			  write_exp_elt_longcst (pstate,
-						 pstate->end_arglist ());
-			  write_exp_elt_opcode (pstate, OP_FUNCALL); }
+			{
+			  pstate->push_new<funcall_operation>
+			    (pstate->pop (), std::vector<operation_up> ());
+			}
 	;
 
 
@@ -566,25 +577,18 @@ exp	:	UNKNOWN_CPP_NAME '('
 			{
 			  /* This could potentially be a an argument defined
 			     lookup function (Koenig).  */
-			  write_exp_elt_opcode (pstate, OP_ADL_FUNC);
-			  write_exp_elt_block
-			    (pstate, pstate->expression_context_block);
-			  write_exp_elt_sym (pstate,
-					     NULL); /* Placeholder.  */
-			  write_exp_string (pstate, $1.stoken);
-			  write_exp_elt_opcode (pstate, OP_ADL_FUNC);
-
-			/* This is to save the value of arglist_len
-			   being accumulated by an outer function call.  */
-
+			  /* This is to save the value of arglist_len
+			     being accumulated by an outer function call.  */
 			  pstate->start_arglist ();
 			}
 		arglist ')'	%prec ARROW
 			{
-			  write_exp_elt_opcode (pstate, OP_FUNCALL);
-			  write_exp_elt_longcst (pstate,
-						 pstate->end_arglist ());
-			  write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  std::vector<operation_up> args
+			    = pstate->pop_vector (pstate->end_arglist ());
+			  pstate->push_new<adl_func_operation>
+			    (copy_name ($1.stoken),
+			     pstate->expression_context_block,
+			     std::move (args));
 			}
 	;
 
@@ -606,33 +610,25 @@ arglist	:	arglist ',' exp   %prec ABOVE_COMMA
 function_method:       exp '(' parameter_typelist ')' const_or_volatile
 			{
 			  std::vector<struct type *> *type_list = $3;
-			  LONGEST len = type_list->size ();
-
-			  write_exp_elt_opcode (pstate, TYPE_INSTANCE);
 			  /* Save the const/volatile qualifiers as
 			     recorded by the const_or_volatile
 			     production's actions.  */
-			  write_exp_elt_longcst
-			    (pstate,
-			     (cpstate->type_stack
-			      .follow_type_instance_flags ()));
-			  write_exp_elt_longcst (pstate, len);
-			  for (type *type_elt : *type_list)
-			    write_exp_elt_type (pstate, type_elt);
-			  write_exp_elt_longcst(pstate, len);
-			  write_exp_elt_opcode (pstate, TYPE_INSTANCE);
+			  type_instance_flags flags
+			    = (cpstate->type_stack
+			       .follow_type_instance_flags ());
+			  pstate->push_new<type_instance_operation>
+			    (flags, std::move (*type_list),
+			     pstate->pop ());
 			}
 	;
 
 function_method_void:	    exp '(' ')' const_or_volatile
-		       { write_exp_elt_opcode (pstate, TYPE_INSTANCE);
-			 /* See above.  */
-			 write_exp_elt_longcst
-			   (pstate,
-			    cpstate->type_stack.follow_type_instance_flags ());
-			 write_exp_elt_longcst (pstate, 0);
-			 write_exp_elt_longcst (pstate, 0);
-			 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
+		       {
+			  type_instance_flags flags
+			    = (cpstate->type_stack
+			       .follow_type_instance_flags ());
+			  pstate->push_new<type_instance_operation>
+			    (flags, std::vector<type *> (), pstate->pop ());
 		       }
        ;
 
@@ -649,9 +645,8 @@ function_method_void_or_typelist: function_method
 
 exp     :       function_method_void_or_typelist COLONCOLON name
 			{
-			  write_exp_elt_opcode (pstate, OP_FUNC_STATIC_VAR);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, OP_FUNC_STATIC_VAR);
+			  pstate->push_new<func_static_var_operation>
+			    (pstate->pop (), copy_name ($3));
 			}
 	;
 
@@ -659,18 +654,26 @@ rcurly	:	'}'
 			{ $$ = pstate->end_arglist () - 1; }
 	;
 exp	:	lcurly arglist rcurly	%prec ARROW
-			{ write_exp_elt_opcode (pstate, OP_ARRAY);
-			  write_exp_elt_longcst (pstate, (LONGEST) 0);
-			  write_exp_elt_longcst (pstate, (LONGEST) $3);
-			  write_exp_elt_opcode (pstate, OP_ARRAY); }
+			{
+			  std::vector<operation_up> args
+			    = pstate->pop_vector ($3 + 1);
+			  pstate->push_new<array_operation> (0, $3,
+							     std::move (args));
+			}
 	;
 
 exp	:	lcurly type_exp rcurly exp  %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_MEMVAL_TYPE); }
+			{ pstate->wrap2<unop_memval_type_operation> (); }
 	;
 
 exp	:	'(' type_exp ')' exp  %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_cast_type_operation> ();
+			  else
+			    pstate->wrap2<unop_cast_type_operation> ();
+			}
 	;
 
 exp	:	'(' exp1 ')'
@@ -680,116 +683,194 @@ exp	:	'(' exp1 ')'
 /* Binary operators in order of decreasing precedence.  */
 
 exp	:	exp '@' exp
-			{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
+			{ pstate->wrap2<repeat_operation> (); }
 	;
 
 exp	:	exp '*' exp
-			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
+			{ pstate->wrap2<mul_operation> (); }
 	;
 
 exp	:	exp '/' exp
-			{ write_exp_elt_opcode (pstate, BINOP_DIV); }
+			{ pstate->wrap2<div_operation> (); }
 	;
 
 exp	:	exp '%' exp
-			{ write_exp_elt_opcode (pstate, BINOP_REM); }
+			{ pstate->wrap2<rem_operation> (); }
 	;
 
 exp	:	exp '+' exp
-			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
+			{ pstate->wrap2<add_operation> (); }
 	;
 
 exp	:	exp '-' exp
-			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
+			{ pstate->wrap2<sub_operation> (); }
 	;
 
 exp	:	exp LSH exp
-			{ write_exp_elt_opcode (pstate, BINOP_LSH); }
+			{ pstate->wrap2<lsh_operation> (); }
 	;
 
 exp	:	exp RSH exp
-			{ write_exp_elt_opcode (pstate, BINOP_RSH); }
+			{ pstate->wrap2<rsh_operation> (); }
 	;
 
 exp	:	exp EQUAL exp
-			{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_equal_operation> ();
+			  else
+			    pstate->wrap2<equal_operation> ();
+			}
 	;
 
 exp	:	exp NOTEQUAL exp
-			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_notequal_operation> ();
+			  else
+			    pstate->wrap2<notequal_operation> ();
+			}
 	;
 
 exp	:	exp LEQ exp
-			{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_leq_operation> ();
+			  else
+			    pstate->wrap2<leq_operation> ();
+			}
 	;
 
 exp	:	exp GEQ exp
-			{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_geq_operation> ();
+			  else
+			    pstate->wrap2<geq_operation> ();
+			}
 	;
 
 exp	:	exp '<' exp
-			{ write_exp_elt_opcode (pstate, BINOP_LESS); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_less_operation> ();
+			  else
+			    pstate->wrap2<less_operation> ();
+			}
 	;
 
 exp	:	exp '>' exp
-			{ write_exp_elt_opcode (pstate, BINOP_GTR); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_gtr_operation> ();
+			  else
+			    pstate->wrap2<gtr_operation> ();
+			}
 	;
 
 exp	:	exp '&' exp
-			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
+			{ pstate->wrap2<bitwise_and_operation> (); }
 	;
 
 exp	:	exp '^' exp
-			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
+			{ pstate->wrap2<bitwise_xor_operation> (); }
 	;
 
 exp	:	exp '|' exp
-			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
+			{ pstate->wrap2<bitwise_ior_operation> (); }
 	;
 
 exp	:	exp ANDAND exp
-			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    {
+			      operation_up rhs = pstate->pop ();
+			      operation_up lhs = pstate->pop ();
+			      pstate->push_new<opencl_logical_binop_operation>
+				(BINOP_LOGICAL_AND, std::move (lhs),
+				 std::move (rhs));
+			    }
+			  else
+			    pstate->wrap2<logical_and_operation> ();
+			}
 	;
 
 exp	:	exp OROR exp
-			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    {
+			      operation_up rhs = pstate->pop ();
+			      operation_up lhs = pstate->pop ();
+			      pstate->push_new<opencl_logical_binop_operation>
+				(BINOP_LOGICAL_OR, std::move (lhs),
+				 std::move (rhs));
+			    }
+			  else
+			    pstate->wrap2<logical_or_operation> ();
+			}
 	;
 
 exp	:	exp '?' exp ':' exp	%prec '?'
-			{ write_exp_elt_opcode (pstate, TERNOP_COND); }
+			{
+			  operation_up last = pstate->pop ();
+			  operation_up mid = pstate->pop ();
+			  operation_up first = pstate->pop ();
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->push_new<opencl_ternop_cond_operation>
+			      (std::move (first), std::move (mid),
+			       std::move (last));
+			  else
+			    pstate->push_new<ternop_cond_operation>
+			      (std::move (first), std::move (mid),
+			       std::move (last));
+			}
 	;
 
 exp	:	exp '=' exp
-			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
+			{
+			  if (pstate->language ()->la_language
+			      == language_opencl)
+			    pstate->wrap2<opencl_assign_operation> ();
+			  else
+			    pstate->wrap2<assign_operation> ();
+			}
 	;
 
 exp	:	exp ASSIGN_MODIFY exp
-			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
-			  write_exp_elt_opcode (pstate, $2);
-			  write_exp_elt_opcode (pstate,
-						BINOP_ASSIGN_MODIFY); }
+			{
+			  operation_up rhs = pstate->pop ();
+			  operation_up lhs = pstate->pop ();
+			  pstate->push_new<assign_modify_operation>
+			    ($2, std::move (lhs), std::move (rhs));
+			}
 	;
 
 exp	:	INT
-			{ write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate, $1.type);
-			  write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
-			  write_exp_elt_opcode (pstate, OP_LONG); }
+			{
+			  pstate->push_new<long_const_operation>
+			    ($1.type, $1.val);
+			}
 	;
 
 exp	:	COMPLEX_INT
 			{
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate, TYPE_TARGET_TYPE ($1.type));
-			  write_exp_elt_longcst (pstate, 0);
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate, TYPE_TARGET_TYPE ($1.type));
-			  write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_opcode (pstate, OP_COMPLEX);
-			  write_exp_elt_type (pstate, $1.type);
-			  write_exp_elt_opcode (pstate, OP_COMPLEX);
+			  operation_up real
+			    = (make_operation<long_const_operation>
+			       (TYPE_TARGET_TYPE ($1.type), 0));
+			  operation_up imag
+			    = (make_operation<long_const_operation>
+			       (TYPE_TARGET_TYPE ($1.type), $1.val));
+			  pstate->push_new<complex_operation>
+			    (std::move (real), std::move (imag), $1.type);
 			}
 	;
 
@@ -798,7 +879,7 @@ exp	:	CHAR
 			  struct stoken_vector vec;
 			  vec.len = 1;
 			  vec.tokens = &$1;
-			  write_exp_string_vector (pstate, $1.type, &vec);
+			  pstate->push_c_string ($1.type, &vec);
 			}
 	;
 
@@ -806,20 +887,20 @@ exp	:	NAME_OR_INT
 			{ YYSTYPE val;
 			  parse_number (pstate, $1.stoken.ptr,
 					$1.stoken.length, 0, &val);
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate, val.typed_val_int.type);
-			  write_exp_elt_longcst (pstate,
-					    (LONGEST) val.typed_val_int.val);
-			  write_exp_elt_opcode (pstate, OP_LONG);
+			  pstate->push_new<long_const_operation>
+			    (val.typed_val_int.type,
+			     val.typed_val_int.val);
 			}
 	;
 
 
 exp	:	FLOAT
-			{ write_exp_elt_opcode (pstate, OP_FLOAT);
-			  write_exp_elt_type (pstate, $1.type);
-			  write_exp_elt_floatcst (pstate, $1.val);
-			  write_exp_elt_opcode (pstate, OP_FLOAT); }
+			{
+			  float_data data;
+			  std::copy (std::begin ($1.val), std::end ($1.val),
+				     std::begin (data));
+			  pstate->push_new<float_const_operation> ($1.type, data);
+			}
 	;
 
 exp	:	COMPLEX_FLOAT
@@ -827,19 +908,22 @@ exp	:	COMPLEX_FLOAT
 			  struct type *underlying
 			    = TYPE_TARGET_TYPE ($1.type);
 
-			  write_exp_elt_opcode (pstate, OP_FLOAT);
-			  write_exp_elt_type (pstate, underlying);
-			  gdb_byte val[16];
-			  target_float_from_host_double (val, underlying, 0);
-			  write_exp_elt_floatcst (pstate, val);
-			  write_exp_elt_opcode (pstate, OP_FLOAT);
-			  write_exp_elt_opcode (pstate, OP_FLOAT);
-			  write_exp_elt_type (pstate, underlying);
-			  write_exp_elt_floatcst (pstate, $1.val);
-			  write_exp_elt_opcode (pstate, OP_FLOAT);
-			  write_exp_elt_opcode (pstate, OP_COMPLEX);
-			  write_exp_elt_type (pstate, $1.type);
-			  write_exp_elt_opcode (pstate, OP_COMPLEX);
+			  float_data val;
+			  target_float_from_host_double (val.data (),
+							 underlying, 0);
+			  operation_up real
+			    = (make_operation<float_const_operation>
+			       (underlying, val));
+
+			  std::copy (std::begin ($1.val), std::end ($1.val),
+				     std::begin (val));
+			  operation_up imag
+			    = (make_operation<float_const_operation>
+			       (underlying, val));
+
+			  pstate->push_new<complex_operation>
+			    (std::move (real), std::move (imag),
+			     $1.type);
 			}
 	;
 
@@ -848,23 +932,22 @@ exp	:	variable
 
 exp	:	DOLLAR_VARIABLE
 			{
-			  write_dollar_variable (pstate, $1);
+			  pstate->push_dollar ($1);
 			}
 	;
 
 exp	:	SELECTOR '(' name ')'
 			{
-			  write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR); }
+			  pstate->push_new<objc_selector_operation>
+			    (copy_name ($3));
+			}
 	;
 
 exp	:	SIZEOF '(' type ')'	%prec UNARY
 			{ struct type *type = $3;
-			  write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate, lookup_signed_typename
-					      (pstate->language (),
-					       "int"));
+			  struct type *int_type
+			    = lookup_signed_typename (pstate->language (),
+						      "int");
 			  type = check_typedef (type);
 
 			    /* $5.3.3/2 of the C++ Standard (n3290 draft)
@@ -873,28 +956,27 @@ exp	:	SIZEOF '(' type ')'	%prec UNARY
 			       the referenced type."  */
 			  if (TYPE_IS_REFERENCE (type))
 			    type = check_typedef (TYPE_TARGET_TYPE (type));
-			  write_exp_elt_longcst (pstate,
-						 (LONGEST) TYPE_LENGTH (type));
-			  write_exp_elt_opcode (pstate, OP_LONG); }
+			  pstate->push_new<long_const_operation>
+			    (int_type, TYPE_LENGTH (type));
+			}
 	;
 
 exp	:	REINTERPRET_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (pstate,
-						UNOP_REINTERPRET_CAST); }
+			{ pstate->wrap2<reinterpret_cast_operation> (); }
 	;
 
 exp	:	STATIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
+			{ pstate->wrap2<unop_cast_type_operation> (); }
 	;
 
 exp	:	DYNAMIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (pstate, UNOP_DYNAMIC_CAST); }
+			{ pstate->wrap2<dynamic_cast_operation> (); }
 	;
 
 exp	:	CONST_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
 			{ /* We could do more error checking here, but
 			     it doesn't seem worthwhile.  */
-			  write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
+			  pstate->wrap2<unop_cast_type_operation> (); }
 	;
 
 string_exp:
@@ -959,7 +1041,7 @@ exp	:	string_exp
 				}
 			    }
 
-			  write_exp_string_vector (pstate, type, &$1);
+			  pstate->push_c_string (type, &$1);
 			  for (i = 0; i < $1.len; ++i)
 			    free ($1.tokens[i].ptr);
 			  free ($1.tokens);
@@ -969,26 +1051,23 @@ exp	:	string_exp
 exp     :	NSSTRING	/* ObjC NextStep NSString constant
 				 * of the form '@' '"' string '"'.
 				 */
-			{ write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING);
-			  write_exp_string (pstate, $1);
-			  write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING); }
+			{
+			  pstate->push_new<objc_nsstring_operation>
+			    (copy_name ($1));
+			}
 	;
 
 /* C++.  */
 exp     :       TRUEKEYWORD
-			{ write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate,
-					  parse_type (pstate)->builtin_bool);
-			  write_exp_elt_longcst (pstate, (LONGEST) 1);
-			  write_exp_elt_opcode (pstate, OP_LONG); }
+			{ pstate->push_new<long_const_operation>
+			    (parse_type (pstate)->builtin_bool, 1);
+			}
 	;
 
 exp     :       FALSEKEYWORD
-			{ write_exp_elt_opcode (pstate, OP_LONG);
-			  write_exp_elt_type (pstate,
-					  parse_type (pstate)->builtin_bool);
-			  write_exp_elt_longcst (pstate, (LONGEST) 0);
-			  write_exp_elt_opcode (pstate, OP_LONG); }
+			{ pstate->push_new<long_const_operation>
+			    (parse_type (pstate)->builtin_bool, 0);
+			}
 	;
 
 /* end of C++.  */
@@ -1029,9 +1108,7 @@ variable:	name_not_typename ENTRY
 				     "parameters, not for \"%s\""),
 				   copy_name ($1.stoken).c_str ());
 
-			  write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
-			  write_exp_elt_sym (pstate, sym);
-			  write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
+			  pstate->push_new<var_entry_value_operation> (sym);
 			}
 	;
 
@@ -1048,10 +1125,9 @@ variable:	block COLONCOLON name
 			  if (symbol_read_needs_frame (sym.symbol))
 			    pstate->block_tracker->update (sym);
 
-			  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
-			  write_exp_elt_block (pstate, sym.block);
-			  write_exp_elt_sym (pstate, sym.symbol);
-			  write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
+			  pstate->push_new<var_value_operation> (sym.symbol,
+								 sym.block);
+			}
 	;
 
 qualified_name:	TYPENAME COLONCOLON name
@@ -1062,34 +1138,24 @@ qualified_name:	TYPENAME COLONCOLON name
 			    error (_("`%s' is not defined as an aggregate type."),
 				   TYPE_SAFE_NAME (type));
 
-			  write_exp_elt_opcode (pstate, OP_SCOPE);
-			  write_exp_elt_type (pstate, type);
-			  write_exp_string (pstate, $3);
-			  write_exp_elt_opcode (pstate, OP_SCOPE);
+			  pstate->push_new<scope_operation> (type,
+							     copy_name ($3));
 			}
 	|	TYPENAME COLONCOLON '~' name
 			{
 			  struct type *type = $1.type;
-			  struct stoken tmp_token;
-			  char *buf;
 
 			  type = check_typedef (type);
 			  if (!type_aggregate_p (type))
 			    error (_("`%s' is not defined as an aggregate type."),
 				   TYPE_SAFE_NAME (type));
-			  buf = (char *) alloca ($4.length + 2);
-			  tmp_token.ptr = buf;
-			  tmp_token.length = $4.length + 1;
-			  buf[0] = '~';
-			  memcpy (buf+1, $4.ptr, $4.length);
-			  buf[tmp_token.length] = 0;
+			  std::string name = "~" + std::string ($4.ptr,
+								$4.length);
 
 			  /* Check for valid destructor name.  */
-			  destructor_name_p (tmp_token.ptr, $1.type);
-			  write_exp_elt_opcode (pstate, OP_SCOPE);
-			  write_exp_elt_type (pstate, type);
-			  write_exp_string (pstate, tmp_token);
-			  write_exp_elt_opcode (pstate, OP_SCOPE);
+			  destructor_name_p (name.c_str (), $1.type);
+			  pstate->push_new<scope_operation> (type,
+							     std::move (name));
 			}
 	|	TYPENAME COLONCOLON name COLONCOLON name
 			{
@@ -1108,8 +1174,7 @@ variable:	qualified_name
 			    = lookup_symbol (name.c_str (),
 					     (const struct block *) NULL,
 					     VAR_DOMAIN, NULL).symbol;
-			  write_exp_symbol_reference (pstate, name.c_str (),
-						      sym);
+			  pstate->push_symbol (name.c_str (), sym);
 			}
 	;
 
@@ -1129,14 +1194,11 @@ variable:	name_not_typename
 			      bound_minimal_symbol resolver
 				= find_gnu_ifunc (sym.symbol);
 			      if (resolver.minsym != NULL)
-				write_exp_msymbol (pstate, resolver);
+				pstate->push_new<var_msym_value_operation>
+				  (resolver.minsym, resolver.objfile);
 			      else
-				{
-				  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
-				  write_exp_elt_block (pstate, sym.block);
-				  write_exp_elt_sym (pstate, sym.symbol);
-				  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
-				}
+				pstate->push_new<var_value_operation>
+				  (sym.symbol, sym.block);
 			    }
 			  else if ($1.is_a_field_of_this)
 			    {
@@ -1144,11 +1206,10 @@ variable:	name_not_typename
 				 not inadvertently convert from a method call
 				 to data ref.  */
 			      pstate->block_tracker->update (sym);
-			      write_exp_elt_opcode (pstate, OP_THIS);
-			      write_exp_elt_opcode (pstate, OP_THIS);
-			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
-			      write_exp_string (pstate, $1.stoken);
-			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			      operation_up thisop
+				= make_operation<op_this_operation> ();
+			      pstate->push_new<structop_ptr_operation>
+				(std::move (thisop), copy_name ($1.stoken));
 			    }
 			  else
 			    {
@@ -1178,15 +1239,11 @@ variable:	name_not_typename
 				   ? find_function_alias_target (msymbol)
 				   : NULL);
 			      if (alias_target != NULL)
-				{
-				  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
-				  write_exp_elt_block
-				    (pstate, SYMBOL_BLOCK_VALUE (alias_target));
-				  write_exp_elt_sym (pstate, alias_target);
-				  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
-				}
+				pstate->push_new<var_value_operation>
+				  (alias_target, SYMBOL_BLOCK_VALUE (alias_target));
 			      else
-				write_exp_msymbol (pstate, msymbol);
+				pstate->push_new<var_msym_value_operation>
+				  (msymbol.minsym, msymbol.objfile);
 			    }
 			}
 	;
@@ -1783,22 +1840,6 @@ name_not_typename :	NAME
 
 %%
 
-/* Like write_exp_string, but prepends a '~'.  */
-
-static void
-write_destructor_name (struct parser_state *par_state, struct stoken token)
-{
-  char *copy = (char *) alloca (token.length + 1);
-
-  copy[0] = '~';
-  memcpy (&copy[1], token.ptr, token.length);
-
-  token.ptr = copy;
-  ++token.length;
-
-  write_exp_string (par_state, token);
-}
-
 /* Returns a stoken of the operator name given by OP (which does not
    include the string "operator").  */
 
@@ -3393,7 +3434,10 @@ c_parse (struct parser_state *par_state)
   popping = 0;
   name_obstack.clear ();
 
-  return yyparse ();
+  int result = yyparse ();
+  if (!result)
+    pstate->set_operation (pstate->pop ());
+  return result;
 }
 
 #ifdef YYBISON
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 67896284720..aa0360b6818 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -43,6 +43,7 @@
 #include "infcall.h"
 #include "valprint.h"
 #include "cli/cli-utils.h"
+#include "c-exp.h"
 
 #include <ctype.h>
 #include <algorithm>
@@ -507,15 +508,20 @@ end_msglist (struct parser_state *ps)
   char *p = msglist_sel;
   CORE_ADDR selid;
 
+  std::vector<expr::operation_up> args = ps->pop_vector (val);
+  expr::operation_up target = ps->pop ();
+  
   selname_chain = sel->next;
   msglist_len = sel->msglist_len;
   msglist_sel = sel->msglist_sel;
   selid = lookup_child_selector (ps->gdbarch (), p);
   if (!selid)
     error (_("Can't find selector \"%s\""), p);
-  write_exp_elt_longcst (ps, selid);
+
+  ps->push_new<expr::objc_msgcall_operation> (selid, std::move (target),
+					      std::move (args));
+
   xfree(p);
-  write_exp_elt_longcst (ps, val);	/* Number of args */
   xfree(sel);
 
   return val;
diff --git a/gdb/testsuite/gdb.base/debug-expr.exp b/gdb/testsuite/gdb.base/debug-expr.exp
index 068c88a3e36..77cf030d906 100644
--- a/gdb/testsuite/gdb.base/debug-expr.exp
+++ b/gdb/testsuite/gdb.base/debug-expr.exp
@@ -45,10 +45,10 @@ gdb_test_debug_expr "print /x {char\[4\]} array" \
 
 # This caused gdb to output garbage and possibly segfault
 gdb_test_debug_expr "print \"hello\"" \
-    ".*OP_STRING\[^\r\n\]*Language-specific string type: 0.*\[\r\n\]\\$$decimal = \"hello\"" \
+    ".*OP_STRING\[^\r\n\]*.*: ordinary string.*\[\r\n\]\\$$decimal = \"hello\"" \
     "string evaluation with debug expr"
 
 # An expression using a function call.
 gdb_test_debug_expr "print call_me ( &val )" \
-    ".*OP_FUNCALL\[^\r\n\]*Number of args: 1.*\[\r\n\]\\$$decimal = 0.*" \
+    ".*OP_FUNCALL\[^\r\n\]*.*UNOP_ADDR.*\[\r\n\]\\$$decimal = 0.*" \
     "function call expression"
-- 
2.26.2