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Fix for GC of Ruby map frames. (#6533)

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We were creating a map decoding frame when starting the *map*,
but clearing the GC slot when finishing each *map entry*.  This
means that the decoding frame could be collected in the meantime.
This commit is contained in:
Joshua Haberman 2019-08-22 14:36:27 -07:00 committed by Paul Yang
parent 8c3a2ce198
commit 780b050975
1 changed files with 20 additions and 17 deletions
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35
ruby/ext/google/protobuf_c/encode_decode.c
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@ -339,33 +339,36 @@ rb_data_type_t MapParseFrame_type = {
{ MapParseFrame_mark, MapParseFrame_free, NULL },
};
static map_parse_frame_t* map_push_frame(VALUE map,
const map_handlerdata_t* handlerdata) {
// Handler to begin a map entry: allocates a temporary frame. This is the
// 'startsubmsg' handler on the msgdef that contains the map field.
static void *startmap_handler(void *closure, const void *hd) {
MessageHeader* msg = closure;
const map_handlerdata_t* mapdata = hd;
map_parse_frame_t* frame = ALLOC(map_parse_frame_t);
frame->handlerdata = handlerdata;
frame->map = map;
native_slot_init(handlerdata->key_field_type, &frame->key_storage);
native_slot_init(handlerdata->value_field_type, &frame->value_storage);
VALUE map_rb = DEREF(msg, mapdata->ofs, VALUE);
Map_set_frame(map,
frame->handlerdata = mapdata;
frame->map = map_rb;
native_slot_init(mapdata->key_field_type, &frame->key_storage);
native_slot_init(mapdata->value_field_type, &frame->value_storage);
Map_set_frame(map_rb,
TypedData_Wrap_Struct(rb_cObject, &MapParseFrame_type, frame));
return frame;
}
// Handler to begin a map entry: allocates a temporary frame. This is the
// 'startsubmsg' handler on the msgdef that contains the map field.
static void *startmapentry_handler(void *closure, const void *hd) {
static bool endmap_handler(void *closure, const void *hd) {
MessageHeader* msg = closure;
const map_handlerdata_t* mapdata = hd;
VALUE map_rb = DEREF(msg, mapdata->ofs, VALUE);
return map_push_frame(map_rb, mapdata);
Map_set_frame(map_rb, Qnil);
return true;
}
// Handler to end a map entry: inserts the value defined during the message into
// the map. This is the 'endmsg' handler on the map entry msgdef.
static bool endmap_handler(void *closure, const void *hd, upb_status* s) {
static bool endmapentry_handler(void* closure, const void* hd, upb_status* s) {
map_parse_frame_t* frame = closure;
const map_handlerdata_t* mapdata = hd;
@ -378,7 +381,6 @@ static bool endmap_handler(void *closure, const void *hd, upb_status* s) {
&frame->value_storage);
Map_index_set(frame->map, key, value);
Map_set_frame(frame->map, Qnil);
return true;
}
@ -595,7 +597,8 @@ static void add_handlers_for_mapfield(upb_handlers* h,
upb_handlers_addcleanup(h, hd, xfree);
attr.handler_data = hd;
upb_handlers_setstartsubmsg(h, fielddef, startmapentry_handler, &attr);
upb_handlers_setstartsubmsg(h, fielddef, startmap_handler, &attr);
upb_handlers_setendsubmsg(h, fielddef, endmap_handler, &attr);
}
// Adds handlers to a map-entry msgdef.
@ -608,7 +611,7 @@ static void add_handlers_for_mapentry(const upb_msgdef* msgdef, upb_handlers* h,
upb_handlers_addcleanup(h, hd, xfree);
attr.handler_data = hd;
upb_handlers_setendmsg(h, endmap_handler, &attr);
upb_handlers_setendmsg(h, endmapentry_handler, &attr);
add_handlers_for_singular_field(
desc, h, key_field,