Background:
I need to integrate the functionality of v8 engine in a project written in
c. So i wrap a js object as:
typedef struct {
v8::Persistent<v8::Object> obj;
} v8_obj;
typedef struct {
v8::Persistent<v8::Function> fun;
} v8_fn;
void* create_v8_obj(Persistent<Object> obj) {
v8_obj * _v8_obj = (v8_obj *)calloc(1, sizeof (v8_obj));
_v8_obj->obj = obj;
return _v8_obj;
}
void* create_v8_fun(Persistent<Function> fun) {
v8_fn * _v8_fn = (v8_fn *)calloc(1, sizeof (v8_fn));
_v8_fn->fun = fun;
return _v8_fn;
}
fb_script_cb_t* v8_obj_get(void *p_v8_obj, const char *key) {
if (p_v8_obj != NULL && key != NULL) {
v8_obj *_v8_obj = reinterpret_cast<v8_obj *>(p_v8_obj);
LOGE("_v8_obj: %p, *obj:%p", _v8_obj, *(_v8_obj->obj));
Local<Value> val = _v8_obj->obj->Get(String::New(key)); // crashed here
if (val.IsEmpty()) {
return NULL;
}
fb_script_cb_t *cb = fb_script_cb_new();
if (val->IsFunction()) {
void* v8_fun =
create_v8_fun(Persistent<Function>::New(Handle<Function>::Cast(val)));
fb_script_cb_set_js(cb, v8_fun);
} else if (val->IsObject()) {
void* v8_obj =
create_v8_obj(Persistent<Object>::New(Handle<Object>::Cast(val)));
fb_script_cb_set_obj(cb, v8_obj);
} else if (val->IsNumber()) {
fb_script_cb_set_int(cb, val->ToInt32()->Value());
}
return cb;
}
return NULL;
}
My scenario is:
1) in a accessor implement i create a v8_obj through create_v8_obj() to
persistent reference(let's call it R1) to a js object(such as
{
"cell": function() {
},
...
}
)
2) after some time, i need to access the property of R1 through v8_obj_get(...,
"cell"), "cell" is one of the property of the js object mentioned in 1)
then the Persistent<Object> can't be used anyway, and crashed at the line in
red. I verified that the address of the wrapper structure and the target object
in Persistent<Object> is right. But the target object is gone away.
"
3583 03-04 20:18:50.368 27163 27163 E faywong : _v8_obj: 0xafdb0ef0,
*obj:0x9f2bc050
3584 03-04 20:18:50.368 27163 27163 F libc : Fatal signal 5 (SIGTRAP), code
4 in tid 27163
"
So what's the problem in my solution? What's the best practice to retain a js
object in c?
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