drgn/libdrgn/object_index.h
Omar Sandoval 0c5df56fba libdrgn: replace symbol index with object index
struct drgn_symbol doesn't really represent a symbol; it's just an
object which hasn't been fully initialized (see c2be52dff0 ("libdrgn:
rename object index to symbol index"), it used to be called a "partial
object"). For stack traces, we're going to have a notion of a symbol
that more closely represents an ELF symbol, so let's get rid of the
temporary struct drgn_symbol representation and just return an object
directly.
2019-07-29 17:04:47 -07:00

84 lines
2.1 KiB
C

// Copyright 2018-2019 - Omar Sandoval
// SPDX-License-Identifier: GPL-3.0+
/**
* @file
*
* Object lookup.
*
* See @ref ObjectIndex.
*/
#ifndef DRGN_OBJECT_INDEX_H
#define DRGN_OBJECT_INDEX_H
#include "drgn.h"
/**
* @ingroup Internals
*
* @defgroup ObjectIndex Object index
*
* Object lookup.
*
* @ref drgn_object_index provides a common interface for finding objects (e.g.,
* variables, constants, and functions) in a program.
*
* @{
*/
/** Registered callback in a @ref drgn_object_index. */
struct drgn_object_finder {
/** The callback. */
drgn_object_find_fn fn;
/** Argument to pass to @ref drgn_object_finder::fn. */
void *arg;
/** Next callback to try. */
struct drgn_object_finder *next;
};
/**
* Object index.
*
* A object index is used to find objects (variables, constants, and functions)
* by name. The types are found using callbacks which are registered with @ref
* drgn_object_index_add_finder(). @ref drgn_object_index_find() searches for an
* object.
*/
struct drgn_object_index {
/** Callbacks for finding objects. */
struct drgn_object_finder *finders;
};
/** Initialize a @ref drgn_object_index. */
void drgn_object_index_init(struct drgn_object_index *oindex);
/** Deinitialize a @ref drgn_object_index. */
void drgn_object_index_deinit(struct drgn_object_index *oindex);
/** @sa drgn_program_add_object_finder() */
struct drgn_error *
drgn_object_index_add_finder(struct drgn_object_index *oindex,
drgn_object_find_fn fn, void *arg);
/**
* Find an object in a @ref drgn_object_index.
*
* @param[in] oindex Object index.
* @param[in] name Name of the object.
* @param[in] filename Exact filename containing the object definition, or @c
* NULL for any definition.
* @param[in] flags Bitmask of @ref drgn_find_object_flags.
* @param[out] ret Returned object.
* @return @c NULL on success, non-@c NULL on error.
*/
struct drgn_error *drgn_object_index_find(struct drgn_object_index *oindex,
const char *name,
const char *filename,
enum drgn_find_object_flags flags,
struct drgn_object *ret);
/** @} */
#endif /* DRGN_OBJECT_INDEX_H */