382ee7e200
Currently we are searching binaries for string ending with ".so" in order to find shared library dependencies. This is not the cleanest solution. Parse wasm binaries instead, and extract the information in structured way. Fixes: QTBUG-121833 Change-Id: Id0efb07af4efe7641ed4fd66f76c395722478f95 Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
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#!/usr/bin/env python3
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# Copyright (C) 2024 The Qt Company Ltd.
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# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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import sys
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import struct
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class WasmBinary:
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"""For reference of binary format see Emscripten source code, especially library_dylink.js."""
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def __init__(self, filepath):
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self._offset = 0
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self._end = 0
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self._dependencies = []
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with open(filepath, 'rb') as file:
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self._binary = file.read()
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self._check_preamble()
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self._parse_subsections()
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def get_dependencies(self):
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return self._dependencies
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def _get_leb(self):
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ret = 0
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mul = 1
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while True:
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byte = self._binary[self._offset]
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self._offset += 1
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ret += (byte & 0x7f) * mul
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mul *= 0x80
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if not (byte & 0x80):
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break
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return ret
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def _get_string(self):
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length = self._get_leb()
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self._offset += length
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return self._binary[self._offset - length:self._offset].decode('utf-8')
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def _check_preamble(self):
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preamble = memoryview(self._binary)[:24]
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int32View = struct.unpack('<6I', preamble)
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assert int32View[0] == 0x6d736100, "magic number not found"
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assert self._binary[8] == 0, "dynlink section needs to be first"
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self._offset = 9
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section_size = self._get_leb()
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self._end = self._offset + section_size
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name = self._get_string()
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assert name == "dylink.0", "section dylink.0 not found"
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def _parse_subsections(self):
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WASM_DYLINK_NEEDED = 0x2
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while self._offset < self._end:
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subsection_type = self._binary[self._offset]
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self._offset += 1
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subsection_size = self._get_leb()
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if subsection_type == WASM_DYLINK_NEEDED:
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needed_dynlibs_count = self._get_leb()
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for _ in range(needed_dynlibs_count):
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self._dependencies.append(self._get_string())
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else:
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self._offset += subsection_size # we don't care about other sections for now
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if __name__ == "__main__":
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if len(sys.argv) != 2:
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print("Usage: python wasm_binary_tools.py <shared_object>")
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sys.exit(1)
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file_path = sys.argv[1]
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binary = WasmBinary(file_path)
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dependencies = binary.get_dependencies()
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for d in dependencies:
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print(d)
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