meson: add windows support to symbols checks

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviwed-by: Dylan Baker <dylan@pnwbakers>

bin/symbols-check.py

@@ -19,9 +19,10 @@ PLATFORM_SYMBOLS = [
 ]
 
 
-def get_symbols(nm, lib):
+def get_symbols_nm(nm, lib):
     '''
     List all the (non platform-specific) symbols exported by the library
+    using `nm`
     '''
     symbols = []
     platform_name = platform.system()
@@ -39,7 +40,35 @@ def get_symbols(nm, lib):
             assert symbol_name[0] == '_'
             symbol_name = symbol_name[1:]
         symbols.append(symbol_name)
+    return symbols
 
+
+def get_symbols_dumpbin(dumpbin, lib):
+    '''
+    List all the (non platform-specific) symbols exported by the library
+    using `dumpbin`
+    '''
+    symbols = []
+    output = subprocess.check_output([dumpbin, '/exports', lib],
+                                     stderr=open(os.devnull, 'w')).decode("ascii")
+    for line in output.splitlines():
+        fields = line.split()
+        # The lines with the symbols are made of at least 4 columns; see details below
+        if len(fields) < 4:
+            continue
+        try:
+            # Making sure the first 3 columns are a dec counter, a hex counter
+            # and a hex address
+            _ = int(fields[0], 10)
+            _ = int(fields[1], 16)
+            _ = int(fields[2], 16)
+        except ValueError:
+            continue
+        symbol_name = fields[3]
+        # De-mangle symbols
+        if symbol_name[0] == '_':
+            symbol_name = symbol_name[1:].split('@')[0]
+        symbols.append(symbol_name)
     return symbols
 
 
@@ -55,12 +84,21 @@ def main():
                         help='path to library')
     parser.add_argument('--nm',
                         action='store',
-                        required=True,
+                        help='path to binary (or name in $PATH)')
+    parser.add_argument('--dumpbin',
+                        action='store',
                         help='path to binary (or name in $PATH)')
     args = parser.parse_args()
 
     try:
-        lib_symbols = get_symbols(args.nm, args.lib)
+        if platform.system() == 'Windows':
+            if not args.dumpbin:
+                parser.error('--dumpbin is mandatory')
+            lib_symbols = get_symbols_dumpbin(args.dumpbin, args.lib)
+        else:
+            if not args.nm:
+                parser.error('--nm is mandatory')
+            lib_symbols = get_symbols_nm(args.nm, args.lib)
     except:
         # We can't run this test, but we haven't technically failed it either
         # Return the GNU "skip" error code