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patch 9.0.1035: object members are not being marked as used

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Problem:    Object members are not being marked as used, garbage collection
            may free them.
Solution:   Mark object members as used.  Fix reference counting.
This commit is contained in:
Bram Moolenaar
2022-12-08 20:42:00 +00:00
parent e5eae82bb7
commit d28d7b94f5
8 changed files with 288 additions and 158 deletions
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86
src/eval.c
View File

@@ -5233,12 +5233,15 @@ free_unref_items(int copyID)
* themselves yet, so that it is possible to decrement refcount counters
*/
// Go through the list of dicts and free items without the copyID.
// Go through the list of dicts and free items without this copyID.
did_free |= dict_free_nonref(copyID);
// Go through the list of lists and free items without the copyID.
// Go through the list of lists and free items without this copyID.
did_free |= list_free_nonref(copyID);
// Go through the list of objects and free items without this copyID.
did_free |= object_free_nonref(copyID);
#ifdef FEAT_JOB_CHANNEL
// Go through the list of jobs and free items without the copyID. This
// must happen before doing channels, because jobs refer to channels, but
@@ -5405,7 +5408,8 @@ set_ref_in_callback(callback_T *cb, int copyID)
}
/*
* Mark all lists and dicts referenced through typval "tv" with "copyID".
* Mark all lists, dicts and other container types referenced through typval
* "tv" with "copyID".
* "list_stack" is used to add lists to be marked. Can be NULL.
* "ht_stack" is used to add hashtabs to be marked. Can be NULL.
*
@@ -5420,7 +5424,9 @@ set_ref_in_item(
{
int abort = FALSE;
if (tv->v_type == VAR_DICT)
switch (tv->v_type)
{
case VAR_DICT:
{
dict_T *dd = tv->vval.v_dict;
@@ -5446,8 +5452,10 @@ set_ref_in_item(
}
}
}
break;
}
else if (tv->v_type == VAR_LIST)
case VAR_LIST:
{
list_T *ll = tv->vval.v_list;
@@ -5473,12 +5481,16 @@ set_ref_in_item(
}
}
}
break;
}
else if (tv->v_type == VAR_FUNC)
case VAR_FUNC:
{
abort = set_ref_in_func(tv->vval.v_string, NULL, copyID);
break;
}
else if (tv->v_type == VAR_PARTIAL)
case VAR_PARTIAL:
{
partial_T *pt = tv->vval.v_partial;
int i;
@@ -5505,10 +5517,12 @@ set_ref_in_item(
// pt_funcstack is handled in set_ref_in_funcstacks()
// pt_loopvars is handled in set_ref_in_loopvars()
}
break;
}
#ifdef FEAT_JOB_CHANNEL
else if (tv->v_type == VAR_JOB)
case VAR_JOB:
{
#ifdef FEAT_JOB_CHANNEL
job_T *job = tv->vval.v_job;
typval_T dtv;
@@ -5528,10 +5542,14 @@ set_ref_in_item(
set_ref_in_item(&dtv, copyID, ht_stack, list_stack);
}
}
#endif
break;
}
else if (tv->v_type == VAR_CHANNEL)
case VAR_CHANNEL:
{
channel_T *ch =tv->vval.v_channel;
#ifdef FEAT_JOB_CHANNEL
channel_T *ch = tv->vval.v_channel;
ch_part_T part;
typval_T dtv;
jsonq_T *jq;
@@ -5542,9 +5560,10 @@ set_ref_in_item(
ch->ch_copyID = copyID;
for (part = PART_SOCK; part < PART_COUNT; ++part)
{
for (jq = ch->ch_part[part].ch_json_head.jq_next; jq != NULL;
jq = jq->jq_next)
set_ref_in_item(jq->jq_value, copyID, ht_stack, list_stack);
for (jq = ch->ch_part[part].ch_json_head.jq_next;
jq != NULL; jq = jq->jq_next)
set_ref_in_item(jq->jq_value, copyID,
ht_stack, list_stack);
for (cq = ch->ch_part[part].ch_cb_head.cq_next; cq != NULL;
cq = cq->cq_next)
if (cq->cq_callback.cb_partial != NULL)
@@ -5574,8 +5593,45 @@ set_ref_in_item(
set_ref_in_item(&dtv, copyID, ht_stack, list_stack);
}
}
}
#endif
break;
}
case VAR_CLASS:
// TODO: mark methods in class_obj_methods ?
break;
case VAR_OBJECT:
{
object_T *obj = tv->vval.v_object;
if (obj != NULL && obj->obj_copyID != copyID)
{
obj->obj_copyID = copyID;
// The typval_T array is right after the object_T.
typval_T *mtv = (typval_T *)(obj + 1);
for (int i = 0; !abort
&& i < obj->obj_class->class_obj_member_count; ++i)
abort = abort || set_ref_in_item(mtv + i, copyID,
ht_stack, list_stack);
}
break;
}
case VAR_UNKNOWN:
case VAR_ANY:
case VAR_VOID:
case VAR_BOOL:
case VAR_SPECIAL:
case VAR_NUMBER:
case VAR_FLOAT:
case VAR_STRING:
case VAR_BLOB:
case VAR_INSTR:
// Types that do not contain any other item
break;
}
return abort;
}

5
src/proto/vim9class.pro
View File

@@ -8,5 +8,8 @@ int class_object_index(char_u **arg, typval_T *rettv, evalarg_T *evalarg, int ve
void copy_object(typval_T *from, typval_T *to);
void object_unref(object_T *obj);
void copy_class(typval_T *from, typval_T *to);
void class_unref(typval_T *tv);
void class_unref(class_T *cl);
void object_created(object_T *obj);
void object_cleared(object_T *obj);
int object_free_nonref(int copyID);
/* vim: set ft=c : */

7
src/structs.h
View File

@@ -1487,8 +1487,13 @@ struct class_S
// Used for v_object of typval of VAR_OBJECT.
// The member variables follow in an array of typval_T.
struct object_S {
class_T *obj_class; // class this object is created for
class_T *obj_class; // class this object is created for;
// pointer adds to class_refcount
int obj_refcount;
object_T *obj_next_used; // for list headed by "first_object"
object_T *obj_prev_used; // for list headed by "first_object"
int obj_copyID; // used by garbage collection
};
#define TTFLAG_VARARGS 0x01 // func args ends with "..."

9
src/testdir/test_vim9_class.vim
View File

@@ -132,11 +132,10 @@ def Test_class_basic()
this.col: number
endclass
# # FIXME: this works but leaks memory
# # use the automatically generated new() method
# var pos = TextPosition.new(2, 12)
# assert_equal(2, pos.lnum)
# assert_equal(12, pos.col)
# use the automatically generated new() method
var pos = TextPosition.new(2, 12)
assert_equal(2, pos.lnum)
assert_equal(12, pos.col)
END
v9.CheckScriptSuccess(lines)
enddef

4
src/typval.c
View File

@@ -85,7 +85,7 @@ free_tv(typval_T *varp)
break;
#endif
case VAR_CLASS:
class_unref(varp);
class_unref(varp->vval.v_class);
break;
case VAR_OBJECT:
object_unref(varp->vval.v_object);
@@ -161,7 +161,7 @@ clear_tv(typval_T *varp)
VIM_CLEAR(varp->vval.v_instr);
break;
case VAR_CLASS:
class_unref(varp);
class_unref(varp->vval.v_class);
break;
case VAR_OBJECT:
object_unref(varp->vval.v_object);

2
src/version.c
View File

@@ -695,6 +695,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
1035,
/**/
1034,
/**/

71
src/vim9class.c
View File

@@ -419,13 +419,18 @@ class_object_index(
CLEAR_FIELD(funcexe);
funcexe.fe_evaluate = TRUE;
// Clear the class or object after calling the function, in
// case the refcount is one.
typval_T tv_tofree = *rettv;
rettv->v_type = VAR_UNKNOWN;
// Call the user function. Result goes into rettv;
// TODO: pass the object
rettv->v_type = VAR_UNKNOWN;
int error = call_user_func_check(fp, argcount, argvars,
rettv, &funcexe, NULL);
// Clear the arguments.
// Clear the previous rettv and the arguments.
clear_tv(&tv_tofree);
for (int idx = 0; idx < argcount; ++idx)
clear_tv(&argvars[idx]);
@@ -494,7 +499,11 @@ object_clear(object_T *obj)
for (int i = 0; i < cl->class_obj_member_count; ++i)
clear_tv(tv + i);
// Remove from the list headed by "first_object".
object_cleared(obj);
vim_free(obj);
class_unref(cl);
}
/*
@@ -522,9 +531,8 @@ copy_class(typval_T *from, typval_T *to)
* Unreference a class. Free it when the reference count goes down to zero.
*/
void
class_unref(typval_T *tv)
class_unref(class_T *cl)
{
class_T *cl = tv->vval.v_class;
if (cl != NULL && --cl->class_refcount <= 0)
{
vim_free(cl->class_name);
@@ -547,5 +555,60 @@ class_unref(typval_T *tv)
}
}
static object_T *first_object = NULL;
/*
* Call this function when an object has been created. It will be added to the
* list headed by "first_object".
*/
void
object_created(object_T *obj)
{
if (first_object != NULL)
{
obj->obj_next_used = first_object;
first_object->obj_prev_used = obj;
}
first_object = obj;
}
/*
* Call this function when an object has been cleared and is about to be freed.
* It is removed from the list headed by "first_object".
*/
void
object_cleared(object_T *obj)
{
if (obj->obj_next_used != NULL)
obj->obj_next_used->obj_prev_used = obj->obj_prev_used;
if (obj->obj_prev_used != NULL)
obj->obj_prev_used->obj_next_used = obj->obj_next_used;
else if (first_object == obj)
first_object = obj->obj_next_used;
}
/*
* Go through the list of all objects and free items without "copyID".
*/
int
object_free_nonref(int copyID)
{
int did_free = FALSE;
object_T *next_obj;
for (object_T *obj = first_object; obj != NULL; obj = next_obj)
{
next_obj = obj->obj_next_used;
if ((obj->obj_copyID & COPYID_MASK) != (copyID & COPYID_MASK))
{
// Free the object and items it contains.
object_clear(obj);
did_free = TRUE;
}
}
return did_free;
}
#endif // FEAT_EVAL

2
src/vim9execute.c
View File

@@ -3018,7 +3018,9 @@ exec_instructions(ectx_T *ectx)
iptr->isn_arg.construct.construct_size);
tv->vval.v_object->obj_class =
iptr->isn_arg.construct.construct_class;
++tv->vval.v_object->obj_class->class_refcount;
tv->vval.v_object->obj_refcount = 1;
object_created(tv->vval.v_object);
break;
// execute Ex command line