intermediate changes

ref:b63d6b71507593ba174dde46e5c3aee4e9ccd498

1 files changed, 123 insertions, 0 deletions

diff --git a/build/scripts/export_script_gen.py b/build/scripts/export_script_gen.py
new file mode 100644
index 00000000000..269af2e3ca0
--- /dev/null
+++ b/build/scripts/export_script_gen.py
@@ -0,0 +1,123 @@
+import argparse
+import collections
+import sys
+
+
+def parse_export_file(src):
+    for line in src:
+        line = line.strip()
+
+        if line and '#' not in line:
+            words = line.split()
+            if len(words) == 2 and words[0] == 'linux_version':
+                yield {'linux_version': words[1]}
+            elif len(words) == 2:
+                yield {'lang': words[0], 'sym': words[1]}
+            elif len(words) == 1:
+                yield {'lang': 'C', 'sym': words[0]}
+            else:
+                raise Exception('unsupported exports line: "{}"'.format(line))
+
+
+def to_c(sym):
+    symbols = collections.deque(sym.split('::'))
+    c_prefixes = [  # demangle prefixes for c++ symbols
+        '_ZN',      # namespace
+        '_ZTIN',    # typeinfo for
+        '_ZTSN',    # typeinfo name for
+        '_ZTTN',    # VTT for
+        '_ZTVN',    # vtable for
+        '_ZNK',     # const methods
+    ]
+    c_sym = ''
+    while symbols:
+        s = symbols.popleft()
+        if s == '*':
+            c_sym += '*'
+            break
+        if '*' in s and len(s) > 1:
+            raise Exception('Unsupported format, cannot guess length of symbol: ' + s)
+        c_sym += str(len(s)) + s
+    if symbols:
+        raise Exception('Unsupported format: ' + sym)
+    if c_sym[-1] != '*':
+        c_sym += 'E*'
+    return ['{prefix}{sym}'.format(prefix=prefix, sym=c_sym) for prefix in c_prefixes]
+
+
+def to_gnu(src, dest):
+    d = collections.defaultdict(list)
+    version = None
+    for item in parse_export_file(src):
+        if item.get('linux_version'):
+            if not version:
+                version = item.get('linux_version')
+            else:
+                raise Exception('More than one linux_version defined')
+        elif item['lang'] == 'C++':
+            d['C'].extend(to_c(item['sym']))
+        else:
+            d[item['lang']].append(item['sym'])
+   
+    if version:
+        dest.write('{} {{\nglobal:\n'.format(version))
+    else:
+        dest.write('{\nglobal:\n')
+
+    for k, v in d.items():
+        dest.write('    extern "' + k + '" {\n')
+
+        for x in v:
+            dest.write('        ' + x + ';\n')
+
+        dest.write('    };\n')
+
+    dest.write('local: *;\n};\n')
+
+
+def to_msvc(src, dest):
+    dest.write('EXPORTS\n')
+    for item in parse_export_file(src):
+        if item.get('linux_version'):
+            continue
+        if item.get('lang') == 'C':
+            dest.write('    {}\n'.format(item.get('sym')))
+
+
+def to_darwin(src, dest):
+    for item in parse_export_file(src):
+        if item.get('linux_version'):
+            continue
+
+        if item['lang'] == 'C':
+            dest.write('-Wl,-exported_symbol,_' + item['sym'])
+        elif item['lang'] == 'C++':
+            for sym in to_c(item['sym']):
+                dest.write('-Wl,-exported_symbol,_' + sym)
+        else:
+            raise Exception('unsupported lang: ' + item['lang'])
+
+
+def main():
+    parser = argparse.ArgumentParser(description='Convert self-invented platform independent export file format to the format required by specific linker')
+    parser.add_argument('src', type=argparse.FileType('r', encoding='UTF-8'), help='platform independent export file path')
+    parser.add_argument('dest', type=argparse.FileType('w', encoding='UTF-8'), help='destination export file for required linker')
+    parser.add_argument('--format', help='destination file type format: gnu, msvc or darwin')
+
+    args = parser.parse_args()
+    if args.format == 'gnu':
+        to_gnu(args.src, args.dest)
+    elif args.format == 'msvc':
+        to_msvc(args.src, args.dest)
+    elif args.format == 'darwin':
+        to_darwin(args.src, args.dest)
+    else:
+        print('Unknown destination file format: {}'.format(args.format), file=sys.stderr)
+        sys.exit(1)
+
+    args.src.close()
+    args.dest.close()
+
+
+if __name__ == '__main__':
+    main()