lsteamclient: Generate functions with calling convention.

CW-Bug-Id: #22729

vrclient_x64/gen_wrapper.py

@@ -308,14 +308,46 @@ def param_needs_conversion(decl):
            struct_needs_conversion(decl)
 
 
+def callconv(cursor):
+    if type(cursor) is not Cursor:
+        return ''
+    canon = cursor.type.get_canonical()
+    if canon.kind != TypeKind.POINTER:
+        return ''
+    canon = canon.get_pointee()
+    if canon.kind != TypeKind.FUNCTIONPROTO:
+        return ''
+    if cursor.type.kind == TypeKind.TYPEDEF:
+        cursor = cursor.type.get_declaration()
+
+    tokens = cursor.get_tokens()
+    while next(tokens).spelling != '(': pass
+    token = f'{next(tokens).spelling} '
+    return token.replace('*', '__stdcall') \
+                .replace('S_CALLTYPE', '__cdecl')
+
+
+def declspec_func(decl, name):
+    ret = declspec(decl.get_result(), "")
+    params = [declspec(a, "") for a in decl.argument_types()]
+    params = ", ".join(params) if len(params) else "void"
+    return f'{ret} ({name})({params})'
+
+
 def declspec(decl, name):
+    call = callconv(decl)
     if type(decl) is Cursor:
         decl = decl.type
+    canon = decl.get_canonical()
+
+    if canon.kind == TypeKind.POINTER and canon.get_pointee().kind == TypeKind.FUNCTIONPROTO:
+        canon = canon.get_pointee()
+        return declspec_func(canon, f"*{call}{name}")
 
     const = 'const ' if decl.is_const_qualified() else ''
     if decl.kind in (TypeKind.POINTER, TypeKind.LVALUEREFERENCE):
         decl = decl.get_pointee()
-        return declspec(decl, f"*{const}{name}")
+        return declspec(decl, f"*{call}{const}{name}")
     if decl.kind == TypeKind.CONSTANTARRAY:
         decl, count = decl.element_type, decl.element_count
         return declspec(decl, f"({const}{name})[{count}]")