llvm/utils/gn/build/symbol_exports.py

   1 #!/usr/bin/env python3
   2
   3 """Converts a .exports file to a format consumable by linkers.
   4
   5 An .exports file is a file with one exported symbol per line.
   6 This script converts a .exports file into a format that linkers
   7 can understand:
   8 - It prepends a `_` to each line for use with -exported_symbols_list for Darwin
   9 - It writes a .def file for use with /DEF: for Windows
  10 - It writes a linker script for use with --version-script elsewhere
  11 """
  12
  13 import argparse
  14 import sys
  15
  16
  17 def main():
  18     parser = argparse.ArgumentParser(description=__doc__)
  19     parser.add_argument("--format", required=True, choices=("linux", "mac", "win"))
  20     parser.add_argument("source")
  21     parser.add_argument("output")
  22     args = parser.parse_args()
  23
  24     symbols = open(args.source).readlines()
  25
  26     if args.format == "linux":
  27         output_lines = (
  28             [
  29                 "LLVM_0 {\n",
  30                 "  global:\n",
  31             ]
  32             + ["    %s;\n" % s.rstrip() for s in symbols]
  33             + ["  local:\n", "    *;\n", "};\n"]
  34         )
  35     elif args.format == "mac":
  36         output_lines = ["_" + s for s in symbols]
  37     else:
  38         assert args.format == "win"
  39         output_lines = ["EXPORTS\n"] + ["  " + s for s in symbols]
  40
  41     open(args.output, "w").writelines(output_lines)
  42
  43
  44 if __name__ == "__main__":
  45     sys.exit(main())