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https://github.com/JakeHillion/drgn.git
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d35243b354
In order to support static members, methods, default function arguments, and value template parameters, we need to be able to store a drgn_object in a drgn_type_member or drgn_type_parameter. These are all cases where we want lazy evaluation, so we can replace drgn_lazy_type with a new drgn_lazy_object which implements the same idea but for objects. Types can still be represented with an absent object. Signed-off-by: Omar Sandoval <osandov@osandov.com>
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
// Copyright (c) Facebook, Inc. and its affiliates.
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// SPDX-License-Identifier: GPL-3.0+
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#include <assert.h>
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#include "lazy_object.h"
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static_assert(offsetof(union drgn_lazy_object, obj.type) ==
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offsetof(union drgn_lazy_object, thunk.dummy_type),
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"drgn_lazy_object layout is invalid");
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struct drgn_error *drgn_lazy_object_evaluate(union drgn_lazy_object *lazy_obj)
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{
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struct drgn_error *err;
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if (!drgn_lazy_object_is_evaluated(lazy_obj)) {
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struct drgn_program *prog = lazy_obj->thunk.prog;
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drgn_object_thunk_fn *fn = lazy_obj->thunk.fn;
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void *arg = lazy_obj->thunk.arg;
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drgn_object_init(&lazy_obj->obj, prog);
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err = fn(&lazy_obj->obj, arg);
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if (err) {
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/* Oops, revert back to a thunk so it can be retried. */
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drgn_lazy_object_init_thunk(lazy_obj, prog, fn, arg);
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return err;
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}
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}
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return NULL;
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}
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void drgn_lazy_object_deinit(union drgn_lazy_object *lazy_obj)
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{
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if (drgn_lazy_object_is_evaluated(lazy_obj))
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drgn_object_deinit(&lazy_obj->obj);
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else
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lazy_obj->thunk.fn(NULL, lazy_obj->thunk.arg);
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}
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struct drgn_error *
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drgn_lazy_object_check_prog(const union drgn_lazy_object *lazy_obj,
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struct drgn_program *prog)
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{
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if ((drgn_lazy_object_is_evaluated(lazy_obj) ?
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drgn_object_program(&lazy_obj->obj) : lazy_obj->thunk.prog)
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!= prog) {
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return drgn_error_create(DRGN_ERROR_INVALID_ARGUMENT,
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"object is from different program");
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}
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return NULL;
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}
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