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// Copyright (c) Meta Platforms, Inc. and affiliates.
// SPDX-License-Identifier: LGPL-2.1-or-later
#include <assert.h>
#include "lazy_object.h"
static_assert(offsetof(union drgn_lazy_object, obj.type) ==
offsetof(union drgn_lazy_object, thunk.dummy_type),
"drgn_lazy_object layout is invalid");
struct drgn_error *drgn_lazy_object_evaluate(union drgn_lazy_object *lazy_obj)
{
struct drgn_error *err;
if (!drgn_lazy_object_is_evaluated(lazy_obj)) {
struct drgn_program *prog = lazy_obj->thunk.prog;
drgn_object_thunk_fn *fn = lazy_obj->thunk.fn;
void *arg = lazy_obj->thunk.arg;
drgn_object_init(&lazy_obj->obj, prog);
err = fn(&lazy_obj->obj, arg);
if (err) {
/* Oops, revert back to a thunk so it can be retried. */
drgn_lazy_object_init_thunk(lazy_obj, prog, fn, arg);
return err;
}
}
return NULL;
}
void drgn_lazy_object_deinit(union drgn_lazy_object *lazy_obj)
{
if (drgn_lazy_object_is_evaluated(lazy_obj))
drgn_object_deinit(&lazy_obj->obj);
else
lazy_obj->thunk.fn(NULL, lazy_obj->thunk.arg);
}
struct drgn_error *
drgn_lazy_object_check_prog(const union drgn_lazy_object *lazy_obj,
struct drgn_program *prog)
{
if ((drgn_lazy_object_is_evaluated(lazy_obj) ?
drgn_object_program(&lazy_obj->obj) : lazy_obj->thunk.prog)
!= prog) {
return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
"object is from different program");
}
return NULL;
}
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