Add JS_GetAnyOpaque() to support polymorphism

To be able to check if the class ID is one of multiple known ones, where the data has a common structure.
frida · May 27, 2022 · 44e7535 · 44e7535
1 parent 1e14b01
commit 44e7535
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diff --git a/quickjs.c b/quickjs.c
@@ -9860,6 +9860,18 @@ void *JS_GetOpaque2(JSContext *ctx, JSValueConst obj, JSClassID class_id)
     return p;
 }
 
+void *JS_GetAnyOpaque(JSValueConst obj, JSClassID *class_id)
+{
+    JSObject *p;
+    if (JS_VALUE_GET_TAG(obj) != JS_TAG_OBJECT) {
+        *class_id = 0;
+        return NULL;
+    }
+    p = JS_VALUE_GET_OBJ(obj);
+    *class_id = p->class_id;
+    return p->u.opaque;
+}
+
 #define HINT_STRING  0
 #define HINT_NUMBER  1
 #define HINT_NONE    2

diff --git a/quickjs.h b/quickjs.h
@@ -809,6 +809,7 @@ int JS_DefinePropertyGetSet(JSContext *ctx, JSValueConst this_obj,
 void JS_SetOpaque(JSValue obj, void *opaque);
 void *JS_GetOpaque(JSValueConst obj, JSClassID class_id);
 void *JS_GetOpaque2(JSContext *ctx, JSValueConst obj, JSClassID class_id);
+void *JS_GetAnyOpaque(JSValueConst obj, JSClassID *class_id);
 
 /* 'buf' must be zero terminated i.e. buf[buf_len] = '\0'. */
 JSValue JS_ParseJSON(JSContext *ctx, const char *buf, size_t buf_len,