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Introduce unop_sizeof_operation

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This adds class unop_sizeof_operation, which implements UNOP_SIZEOF.

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

	* expop.h (class unop_sizeof_operation): New.
	* ax-gdb.c (unop_sizeof_operation::do_generate_ax): New method.
This commit is contained in:
Tom Tromey
2021-03-08 07:27:57 -07:00
parent 14aff815df
commit 85d23bda83
3 changed files with 57 additions and 0 deletions
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23
gdb/ax-gdb.c
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@@ -2491,6 +2491,29 @@ comma_operation::do_generate_ax (struct expression *exp,
/* It's the consumer's responsibility to trace the right operand. */
}
void
unop_sizeof_operation::do_generate_ax (struct expression *exp,
struct agent_expr *ax,
struct axs_value *value,
struct type *cast_type)
{
/* We don't care about the value of the operand expression; we only
care about its type. However, in the current arrangement, the
only way to find an expression's type is to generate code for it.
So we generate code for the operand, and then throw it away,
replacing it with code that simply pushes its size. */
int start = ax->len;
std::get<0> (m_storage)->generate_ax (exp, ax, value);
/* Throw away the code we just generated. */
ax->len = start;
ax_const_l (ax, TYPE_LENGTH (value->type));
value->kind = axs_rvalue;
value->type = builtin_type (ax->gdbarch)->builtin_int;
}
}
/* This handles the middle-to-right-side of code generation for binary