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Implement UNOP_MEMVAL and UNOP_MEMVAL_TYPE

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This adds class unop_memval_operation and unop_memval_type_operation,
which implement UNOP_MEMVAL and UNOP_MEMVAL_TYPE.

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

	* expop.h (class unop_memval_operation)
	(class unop_memval_type_operation): New.
	* eval.c (eval_op_memval): No longer static.
	(unop_memval_operation::evaluate_for_address)
	(unop_memval_type_operation::evaluate_for_address)
	(unop_memval_operation::evaluate_for_sizeof)
	(unop_memval_type_operation::evaluate_for_sizeof): New methods.
	* ax-gdb.c (unop_memval_operation::do_generate_ax)
	(unop_memval_type_operation::do_generate_ax): New methods.
This commit is contained in:
Tom Tromey
2021-03-08 07:27:57 -07:00
parent ae4bb61e19
commit cbc18219d3
4 changed files with 165 additions and 1 deletions
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12
gdb/ChangeLog
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@ -1,3 +1,15 @@
2021-03-08 Tom Tromey <tom@tromey.com>
* expop.h (class unop_memval_operation)
(class unop_memval_type_operation): New.
* eval.c (eval_op_memval): No longer static.
(unop_memval_operation::evaluate_for_address)
(unop_memval_type_operation::evaluate_for_address)
(unop_memval_operation::evaluate_for_sizeof)
(unop_memval_type_operation::evaluate_for_sizeof): New methods.
* ax-gdb.c (unop_memval_operation::do_generate_ax)
(unop_memval_type_operation::do_generate_ax): New methods.
2021-03-08 Tom Tromey <tom@tromey.com>
* expop.h (class unop_alignof_operation): New.

40
gdb/ax-gdb.c
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@ -2514,6 +2514,46 @@ unop_sizeof_operation::do_generate_ax (struct expression *exp,
value->type = builtin_type (ax->gdbarch)->builtin_int;
}
void
unop_memval_operation::do_generate_ax (struct expression *exp,
struct agent_expr *ax,
struct axs_value *value,
struct type *cast_type)
{
std::get<0> (m_storage)->generate_ax (exp, ax, value);
/* If we have an axs_rvalue or an axs_lvalue_memory, then we
already have the right value on the stack. For
axs_lvalue_register, we must convert. */
if (value->kind == axs_lvalue_register)
require_rvalue (ax, value);
value->type = std::get<1> (m_storage);
value->kind = axs_lvalue_memory;
}
void
unop_memval_type_operation::do_generate_ax (struct expression *exp,
struct agent_expr *ax,
struct axs_value *value,
struct type *cast_type)
{
struct value *val
= std::get<0> (m_storage)->evaluate (nullptr, exp,
EVAL_AVOID_SIDE_EFFECTS);
struct type *type = value_type (val);
std::get<1> (m_storage)->generate_ax (exp, ax, value);
/* If we have an axs_rvalue or an axs_lvalue_memory, then we
already have the right value on the stack. For
axs_lvalue_register, we must convert. */
if (value->kind == axs_lvalue_register)
require_rvalue (ax, value);
value->type = type;
value->kind = axs_lvalue_memory;
}
}
/* This handles the middle-to-right-side of code generation for binary

37
gdb/eval.c
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@ -1897,7 +1897,7 @@ eval_op_alignof (struct type *expect_type, struct expression *exp,
/* A helper function for UNOP_MEMVAL. */
static struct value *
struct value *
eval_op_memval (struct type *expect_type, struct expression *exp,
enum noside noside,
struct value *arg1, struct type *type)
@ -3333,6 +3333,25 @@ var_msym_value_operation::evaluate_for_address (struct expression *exp,
return value_addr (val);
}
value *
unop_memval_operation::evaluate_for_address (struct expression *exp,
enum noside noside)
{
return value_cast (lookup_pointer_type (std::get<1> (m_storage)),
std::get<0> (m_storage)->evaluate (nullptr, exp, noside));
}
value *
unop_memval_type_operation::evaluate_for_address (struct expression *exp,
enum noside noside)
{
value *typeval = std::get<0> (m_storage)->evaluate (nullptr, exp,
EVAL_AVOID_SIDE_EFFECTS);
struct type *type = value_type (typeval);
return value_cast (lookup_pointer_type (type),
std::get<1> (m_storage)->evaluate (nullptr, exp, noside));
}
}
/* Evaluate like `evaluate_subexp' except coercing arrays to pointers.
@ -3604,6 +3623,22 @@ unop_ind_base_operation::evaluate_for_sizeof (struct expression *exp,
return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
}
value *
unop_memval_operation::evaluate_for_sizeof (struct expression *exp,
enum noside noside)
{
return evaluate_subexp_for_sizeof_base (exp, std::get<1> (m_storage));
}
value *
unop_memval_type_operation::evaluate_for_sizeof (struct expression *exp,
enum noside noside)
{
value *typeval = std::get<0> (m_storage)->evaluate (nullptr, exp,
EVAL_AVOID_SIDE_EFFECTS);
return evaluate_subexp_for_sizeof_base (exp, value_type (typeval));
}
}
/* Evaluate a subexpression of EXP, at index *POS, and return a value

77
gdb/expop.h
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@ -193,6 +193,10 @@ extern struct value *eval_op_alignof (struct type *expect_type,
struct expression *exp,
enum noside noside,
struct value *arg1);
extern struct value *eval_op_memval (struct type *expect_type,
struct expression *exp,
enum noside noside,
struct value *arg1, struct type *type);
namespace expr
{
@ -1636,6 +1640,79 @@ public:
{ return UNOP_ALIGNOF; }
};
/* Implement UNOP_MEMVAL. */
class unop_memval_operation
: public tuple_holding_operation<operation_up, struct type *>
{
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 eval_op_memval (expect_type, exp, noside, val,
std::get<1> (m_storage));
}
value *evaluate_for_sizeof (struct expression *exp,
enum noside noside) override;
value *evaluate_for_address (struct expression *exp,
enum noside noside) override;
enum exp_opcode opcode () const override
{ return UNOP_MEMVAL; }
protected:
void do_generate_ax (struct expression *exp,
struct agent_expr *ax,
struct axs_value *value,
struct type *cast_type)
override;
};
/* Implement UNOP_MEMVAL_TYPE. */
class unop_memval_type_operation
: public tuple_holding_operation<operation_up, operation_up>
{
public:
using tuple_holding_operation::tuple_holding_operation;
value *evaluate (struct type *expect_type,
struct expression *exp,
enum noside noside) override
{
value *typeval
= std::get<0> (m_storage)->evaluate (expect_type, exp,
EVAL_AVOID_SIDE_EFFECTS);
struct type *type = value_type (typeval);
value *val = std::get<1> (m_storage)->evaluate (expect_type, exp, noside);
return eval_op_memval (expect_type, exp, noside, val, type);
}
value *evaluate_for_sizeof (struct expression *exp,
enum noside noside) override;
value *evaluate_for_address (struct expression *exp,
enum noside noside) override;
enum exp_opcode opcode () const override
{ return UNOP_MEMVAL_TYPE; }
protected:
void do_generate_ax (struct expression *exp,
struct agent_expr *ax,
struct axs_value *value,
struct type *cast_type)
override;
};
} /* namespace expr */
#endif /* EXPOP_H */