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lib/clippy: add libelf wrapper

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This adds _clippy.ELFFile, which provides a fast wrapper around libelf.
The API is similar to / a subset of pyelfutils, which unfortunately is
painfully slow (to the tune of minutes instead of seconds.)

The idea is that xrefs can be read out of ELF files by reading out the
"xref_array" section or "FRRouting/XREF" note.

Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
David Lamparter 2018-08-09 19:11:53 +02:00 committed by David Lamparter
parent 4fe016fe13
commit 5609b3af49
6 changed files with 1323 additions and 1 deletions
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14
configure.ac
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@ -794,6 +794,20 @@ fi
#
AS_IF([test "$host" = "$build"], [
AC_CHECK_HEADER([gelf.h], [], [
AC_MSG_ERROR([libelf headers are required for building clippy. (Host only when cross-compiling.)])
])
AC_CHECK_LIB([elf], [elf_memory], [], [
AC_MSG_ERROR([libelf is required for building clippy. (Host only when cross-compiling.)])
])
AC_CHECK_LIB([elf], [elf_getdata_rawchunk], [
AC_DEFINE([HAVE_ELF_GETDATA_RAWCHUNK], [1], [Have elf_getdata_rawchunk()])
])
AC_CHECK_LIB([elf], [gelf_getnote], [
AC_DEFINE([HAVE_GELF_GETNOTE], [1], [Have gelf_getnote()])
])
FRR_PYTHON_DEV
], [
FRR_PYTHON

1
debian/control vendored
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@ -13,6 +13,7 @@ Build-Depends: bison,
install-info,
libc-ares-dev,
libcap-dev,
libelf-dev,
libjson-c-dev | libjson0-dev,
libpam0g-dev | libpam-dev,
libpcre3-dev,

2
lib/clippy.h
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@ -20,6 +20,7 @@
#ifndef _FRR_CLIPPY_H
#define _FRR_CLIPPY_H
#include <stdbool.h>
#include <Python.h>
#ifdef __cplusplus
@ -28,6 +29,7 @@ extern "C" {
extern PyObject *clippy_parse(PyObject *self, PyObject *args);
extern PyMODINIT_FUNC command_py_init(void);
extern bool elf_py_init(PyObject *pymod);
#ifdef __cplusplus
}

2
lib/command_py.c
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@ -345,5 +345,7 @@ PyMODINIT_FUNC command_py_init(void)
PyModule_AddObject(pymod, "GraphNode", (PyObject *)&typeobj_graph_node);
Py_INCREF(&typeobj_graph);
PyModule_AddObject(pymod, "Graph", (PyObject *)&typeobj_graph);
if (!elf_py_init(pymod))
initret(NULL);
initret(pymod);
}

1301
lib/elf_py.c Normal file
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File diff suppressed because it is too large Load diff

4
lib/subdir.am
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@ -410,7 +410,7 @@ lib_grammar_sandbox_LDADD = \
lib_clippy_CPPFLAGS = $(AM_CPPFLAGS) -D_GNU_SOURCE -DBUILDING_CLIPPY
lib_clippy_CFLAGS = $(PYTHON_CFLAGS)
lib_clippy_LDADD = $(PYTHON_LIBS) $(UST_LIBS)
lib_clippy_LDADD = $(PYTHON_LIBS) $(UST_LIBS) -lelf
lib_clippy_LDFLAGS = -export-dynamic
lib_clippy_SOURCES = \
lib/jhash.c \
@ -420,9 +420,11 @@ lib_clippy_SOURCES = \
lib/command_parse.y \
lib/command_py.c \
lib/defun_lex.l \
lib/elf_py.c \
lib/graph.c \
lib/libfrr_trace.c \
lib/memory.c \
lib/typesafe.c \
lib/vector.c \
# end