drgn/libdrgn/error.h

// Copyright 2018-2019 - Omar Sandoval
// SPDX-License-Identifier: GPL-3.0+

/**
 * @file
 *
 * Error helpers.
 *
 * See @ref Errors.
 */

#ifndef DRGN_ERROR_H
#define DRGN_ERROR_H

#include <stdlib.h>

#include "drgn.h"

/**
 * @ingroup Internals
 *
 * @defgroup Errors Errors
 *
 * Common errors.
 *
 * @{
 */

#define DRGN_UNREACHABLE() abort()

struct drgn_object_type;

/**
 * Global stop iteration error.
 *
 * This is also used as a special sentinel return in various places internally.
 */
extern struct drgn_error drgn_stop;

/** Not an ELF file. */
extern struct drgn_error drgn_not_elf;

struct string_builder;

/**
 * Create a @ref drgn_error with a message from a @ref string_builder.
 *
 * This finalizes the string builder.
 */
struct drgn_error *drgn_error_from_string_builder(enum drgn_error_code code,
						  struct string_builder *sb);

/**
 * Append a formatted @ref drgn_error to a @ref string_builder.
 *
 * @return @c true on success, @c false on error (if we couldn't allocate
 * memory).
 */
bool string_builder_append_error(struct string_builder *sb,
				 struct drgn_error *err);

/** Create a @ref drgn_error from the libelf error indicator. */
struct drgn_error *drgn_error_libelf(void)
	__attribute__((returns_nonnull));

/** Create a @ref drgn_error from the libdw error indicator. */
struct drgn_error *drgn_error_libdw(void)
	__attribute__((returns_nonnull));

/**
 * Create a @ref drgn_error with a type name.
 *
 * The error code will be @ref DRGN_ERROR_TYPE.
 *
 * @param[in] format Format string for the type error. Must contain %s, which
 * will be replaced with the type name, and no other conversion specifications.
 */
struct drgn_error *drgn_type_error(const char *format, struct drgn_type *type)
	__attribute__((returns_nonnull));

/**
 * Create a @ref drgn_error with a qualified type name.
 *
 * @sa drgn_type_error().
 */
struct drgn_error *
drgn_qualified_type_error(const char *format,
			  struct drgn_qualified_type qualified_type)
	__attribute__((returns_nonnull));

/**
 * Create a @ref drgn_error for an incomplete type.
 *
 * @sa drgn_type_error().
 */
struct drgn_error *drgn_error_incomplete_type(const char *format,
					      struct drgn_type *type);

/**
 * Create a @ref drgn_error for a type which does not have a given member.
 *
 * The error code will be @ref DRGN_ERROR_LOOKUP.
 */
struct drgn_error *drgn_error_member_not_found(struct drgn_type *type,
					       const char *member_name)
	__attribute__((returns_nonnull));

/** Create a @ref drgn_error for invalid types to a binary operator. */
struct drgn_error *drgn_error_binary_op(const char *op_name,
					struct drgn_object_type *type1,
					struct drgn_object_type *type2)
	__attribute__((returns_nonnull));

/** Create a @ref drgn_error for an invalid type to a unary operator. */
struct drgn_error *drgn_error_unary_op(const char *op_name,
				       struct drgn_object_type *type)
	__attribute__((returns_nonnull));

/** @} */

#endif /* DRGN_ERROR_H */