#!/usr/bin/env python
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#
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# Copyright (C) 2018 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script looks through compiled object file (stored human readable text),
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# and looks for the compile-time constants (added through custom "asm" block).
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# For example: .ascii ">>OBJECT_ALIGNMENT_MASK $7 $0<<"
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#
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# It will transform each such line to #define which is usabe in assembly code.
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# For example: #define OBJECT_ALIGNMENT_MASK 0x7
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#
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# Usage: make_header.py out/soong/.intermediates/.../asm_defines.o
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#
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import argparse
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import re
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import sys
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def convert(input):
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"""Find all defines in the compiler generated assembly and convert them to #define pragmas"""
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asm_define_re = re.compile(r'">>(\w+) (?:\$|#)([-0-9]+) (?:\$|#)(0|1)<<"')
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asm_defines = asm_define_re.findall(input)
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if not asm_defines:
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raise RuntimeError("Failed to find any asm defines in the input")
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# Convert the found constants to #define pragmas.
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# In case the C++ compiler decides to reorder the AsmDefinesFor_${name} functions,
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# we don't want the order of the .h file to change from one compilation to another.
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# Sorting ensures deterministic order of the #defines.
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output = []
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for name, value, negative_value in sorted(asm_defines):
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value = int(value)
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if value < 0 and negative_value == "0":
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# Overflow - uint64_t constant was pretty printed as negative value.
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value += 2 ** 64 # Python will use arbitrary precision arithmetic.
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output.append("#define {0} {1:#x}".format(name, value))
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return "\n".join(output)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument('input', help="Object file as text")
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args = parser.parse_args()
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print(convert(open(args.input, "r").read()))
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