Add support for reading LLVM bitcode files

diffoscope/__init__.py

@@ -109,6 +109,14 @@ class RequiredToolNotFound(Exception):
             'debian': 'default-jdk | java-sdk',
             'arch': 'java-environment',
         },
+        'llvm-bcanalyzer': {
+            'debian': 'llvm',
+            'arch': 'llvm',
+        },
+        'llvm-dis': {
+            'debian': 'llvm',
+            'arch': 'llvm',
+        },
         'ls': {
             'debian': 'coreutils',
             'arch': 'coreutils',

diffoscope/comparators/__init__.py

@@ -59,6 +59,7 @@ from diffoscope.comparators.image import ImageFile
 from diffoscope.comparators.ipk import IpkFile
 from diffoscope.comparators.iso9660 import Iso9660File
 from diffoscope.comparators.json import JSONFile
+from diffoscope.comparators.llvm import LlvmBitCodeFile
 from diffoscope.comparators.macho import MachoFile
 from diffoscope.comparators.mono import MonoExeFile
 from diffoscope.comparators.pdf import PdfFile
@@ -147,6 +148,7 @@ FILE_CLASSES = (
     MachoFile,
     FsImageFile,
     StaticLibFile,
+    LlvmBitCodeFile,
     Sqlite3Database,
     TtfFile,
     MoFile,

diffoscope/comparators/llvm.py

+# -*- coding: utf-8 -*-
+#
+# diffoscope: in-depth comparison of files, archives, and directories
+#
+# Copyright © 2015 Jérémy Bobbio <lunar@debian.org>
+# Copyright © 2016 Ximin Luo <infinity0@debian.org>
+#
+# diffoscope is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# diffoscope is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with diffoscope.  If not, see <http://www.gnu.org/licenses/>.
+
+from diffoscope import tool_required
+from diffoscope.comparators.binary import File
+from diffoscope.comparators.utils import Command
+from diffoscope.difference import Difference
+
+
+class LlvmBcAnalyzer(Command):
+    @tool_required('llvm-bcanalyzer')
+    def cmdline(self):
+        return ['llvm-bcanalyzer', '-dump', self.path]
+
+class LlvmBcDisassembler(Command):
+    @tool_required('llvm-dis')
+    def cmdline(self):
+        return ['llvm-dis', '-o', '-', self.path]
+
+class LlvmBitCodeFile(File):
+    @staticmethod
+    def recognizes(file):
+        return file.magic_file_type and file.magic_file_type.startswith('LLVM IR bitcode')
+
+    def compare_details(self, other, source=None):
+        return [Difference.from_command(LlvmBcAnalyzer,   self.path, other.path),
+                Difference.from_command(LlvmBcDisassembler, self.path, other.path)]