widl: Support non-default calling conventions for object methods.

tools/widl/header.c

@@ -729,10 +729,12 @@ static void write_cpp_method_def(const type_t *iface)
   {
     var_t *def = cur->def;
     if (!is_callas(def->attrs)) {
+      const char *callconv = get_attrp(def->type->attrs, ATTR_CALLCONV);
+      if (!callconv) callconv = "";
       indent(header, 0);
       fprintf(header, "virtual ");
       write_type_decl_left(header, get_func_return_type(cur));
-      fprintf(header, " STDMETHODCALLTYPE ");
+      fprintf(header, " %s ", callconv);
       write_name(header, def);
       fprintf(header, "(\n");
       write_args(header, cur->args, iface->name, 2, TRUE);
@@ -755,9 +757,11 @@ static void do_write_c_method_def(const type_t *iface, const char *name)
   {
     const var_t *def = cur->def;
     if (!is_callas(def->attrs)) {
+      const char *callconv = get_attrp(def->type->attrs, ATTR_CALLCONV);
+      if (!callconv) callconv = "";
       indent(header, 0);
       write_type_decl_left(header, get_func_return_type(cur));
-      fprintf(header, " (STDMETHODCALLTYPE *");
+      fprintf(header, " (%s *", callconv);
       write_name(header, def);
       fprintf(header, ")(\n");
       write_args(header, cur->args, name, 1, TRUE);
@@ -787,9 +791,11 @@ static void write_method_proto(const type_t *iface)
     const var_t *def = cur->def;
 
     if (!is_local(def->attrs)) {
+      const char *callconv = get_attrp(def->type->attrs, ATTR_CALLCONV);
+      if (!callconv) callconv = "";
       /* proxy prototype */
       write_type_decl_left(header, get_func_return_type(cur));
-      fprintf(header, " CALLBACK %s_", iface->name);
+      fprintf(header, " %s %s_", callconv, iface->name);
       write_name(header, def);
       fprintf(header, "_Proxy(\n");
       write_args(header, cur->args, iface->name, 1, TRUE);

tools/widl/proxy.c

@@ -253,10 +253,12 @@ static void gen_proxy(type_t *iface, const func_t *cur, int idx,
   var_t *def = cur->def;
   int has_ret = !is_void(get_func_return_type(cur));
   int has_full_pointer = is_full_pointer_function(cur);
+  const char *callconv = get_attrp(def->type->attrs, ATTR_CALLCONV);
+  if (!callconv) callconv = "";
 
   indent = 0;
   write_type_decl_left(proxy, get_func_return_type(cur));
-  print_proxy( " STDMETHODCALLTYPE %s_", iface->name);
+  print_proxy( " %s %s_", callconv, iface->name);
   write_name(proxy, def);
   print_proxy( "_Proxy(\n");
   write_args(proxy, cur->args, iface->name, 1, TRUE);