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Implement unary increment and decrement operations

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This implements the unary increment and decrement operations, "++" and
"--".

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

	* expop.h (unop_incr_operation): New template.
	(preinc_operation, predec_operation, postinc_operation)
	(postdec_operation): New typedefs.
	* eval.c (eval_op_preinc, eval_op_predec, eval_op_postinc)
	(eval_op_postdec): No longer static.
This commit is contained in:
Tom Tromey
2021-03-08 07:27:57 -07:00
parent 9307d17b7a
commit 6d89e2962a
3 changed files with 62 additions and 4 deletions
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50
gdb/expop.h
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@@ -162,6 +162,26 @@ extern struct value *eval_op_lognot (struct type *expect_type,
enum noside noside,
enum exp_opcode op,
struct value *arg1);
extern struct value *eval_op_preinc (struct type *expect_type,
struct expression *exp,
enum noside noside,
enum exp_opcode op,
struct value *arg1);
extern struct value *eval_op_predec (struct type *expect_type,
struct expression *exp,
enum noside noside,
enum exp_opcode op,
struct value *arg1);
extern struct value *eval_op_postinc (struct type *expect_type,
struct expression *exp,
enum noside noside,
enum exp_opcode op,
struct value *arg1);
extern struct value *eval_op_postdec (struct type *expect_type,
struct expression *exp,
enum noside noside,
enum exp_opcode op,
struct value *arg1);
namespace expr
{
@@ -1316,6 +1336,36 @@ using unary_complement_operation
using unary_logical_not_operation
= usual_ax_unop_operation<UNOP_LOGICAL_NOT, eval_op_lognot>;
/* Handle pre- and post- increment and -decrement. */
template<enum exp_opcode OP, unary_ftype FUNC>
class unop_incr_operation
: public tuple_holding_operation<operation_up>
{
public:
using tuple_holding_operation::tuple_holding_operation;
value *evaluate (struct type *expect_type,
struct expression *exp,
enum noside noside) override
{
value *val = std::get<0> (m_storage)->evaluate (expect_type, exp, noside);
return FUNC (expect_type, exp, noside, OP, val);
}
enum exp_opcode opcode () const override
{ return OP; }
};
using preinc_operation
= unop_incr_operation<UNOP_PREINCREMENT, eval_op_preinc>;
using predec_operation
= unop_incr_operation<UNOP_PREDECREMENT, eval_op_predec>;
using postinc_operation
= unop_incr_operation<UNOP_POSTINCREMENT, eval_op_postinc>;
using postdec_operation
= unop_incr_operation<UNOP_POSTDECREMENT, eval_op_postdec>;
} /* namespace expr */
#endif /* EXPOP_H */