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75c3679147
The current mixed Python/C implementation works well, but it has a couple of important limitations: - It's too slow for some common use cases, like iterating over large data structures. - It can't be reused in utilities written in other languages. This replaces the internals with a new library written in C, libdrgn. It includes Python bindings with mostly the same public interface as before, with some important improvements: - Types are now represented by a single Type class rather than the messy polymorphism in the Python implementation. - Qualifiers are a bitmask instead of a set of strings. - Bit fields are not considered a separate type. - The lvalue/rvalue terminology is replaced with reference/value. - Structure, union, and array values are better supported. - Function objects are supported. - Program distinguishes between lookups of variables, constants, and functions. The C rewrite is about 6x as fast as the original Python when using the Python bindings, and about 8x when using the C API directly. Currently, the exposed API in C is fairly conservative. In the future, the memory reader, type index, and object index APIs will probably be exposed for more flexibility.
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
// Copyright 2018-2019 - Omar Sandoval
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// SPDX-License-Identifier: GPL-3.0+
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/**
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* @file
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*
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* Error helpers.
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*
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* See @ref Errors.
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*/
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#ifndef DRGN_ERROR_H
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#define DRGN_ERROR_H
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#include <stdlib.h>
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#include "drgn.h"
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/**
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* @ingroup Internals
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*
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* @defgroup Errors Errors
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*
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* Common errors.
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*
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* @{
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*/
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#define DRGN_UNREACHABLE() abort()
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struct drgn_object_type;
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/**
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* Global stop iteration error.
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*
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* This is also used as a special sentinel return in various places internally.
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*/
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extern struct drgn_error drgn_stop;
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/** Not an ELF file. */
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extern struct drgn_error drgn_not_elf;
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/** Create a @ref drgn_error from the libelf error indicator. */
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struct drgn_error *drgn_error_libelf(void)
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__attribute__((returns_nonnull));
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/** Create a @ref drgn_error from the libdw error indicator. */
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struct drgn_error *drgn_error_libdw(void)
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__attribute__((returns_nonnull));
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/**
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* Create a @ref drgn_error with a type name.
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*
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* The error code will be @ref DRGN_ERROR_TYPE.
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*
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* @param[in] format Format string for the type error. Must contain %s, which
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* will be replaced with the type name, and no other conversion specifications.
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*/
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struct drgn_error *drgn_type_error(const char *format, struct drgn_type *type)
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__attribute__((returns_nonnull));
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/**
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* Create a @ref drgn_error with a qualified type name.
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*
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* @sa drgn_type_error().
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*/
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struct drgn_error *
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drgn_qualified_type_error(const char *format,
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struct drgn_qualified_type qualified_type)
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__attribute__((returns_nonnull));
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/**
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* Create a @ref drgn_error for an incomplete type.
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*
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* @sa drgn_type_error().
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*/
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struct drgn_error *drgn_error_incomplete_type(const char *format,
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struct drgn_type *type);
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/**
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* Create a @ref drgn_error for a type which does not have a given member.
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*
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* The error code will be @ref DRGN_ERROR_LOOKUP.
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*/
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struct drgn_error *drgn_error_member_not_found(struct drgn_type *type,
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const char *member_name)
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__attribute__((returns_nonnull));
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/** Create a @ref drgn_error for invalid types to a binary operator. */
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struct drgn_error *drgn_error_binary_op(const char *op_name,
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struct drgn_object_type *type1,
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struct drgn_object_type *type2)
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__attribute__((returns_nonnull));
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/** Create a @ref drgn_error for an invalid type to a unary operator. */
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struct drgn_error *drgn_error_unary_op(const char *op_name,
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struct drgn_object_type *type)
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__attribute__((returns_nonnull));
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/** @} */
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#endif /* DRGN_ERROR_H */
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