Add m-esr52 at 52.6.0

1 files changed, 90 insertions, 0 deletions

diff --git a/js/src/jswatchpoint.h b/js/src/jswatchpoint.h
new file mode 100644
index 000000000..bba6c38ce
--- /dev/null
+++ b/js/src/jswatchpoint.h
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jswatchpoint_h
+#define jswatchpoint_h
+
+#include "jsalloc.h"
+
+#include "gc/Barrier.h"
+#include "js/HashTable.h"
+
+namespace js {
+
+struct WeakMapTracer;
+
+struct WatchKey {
+    WatchKey() {}
+    WatchKey(JSObject* obj, jsid id) : object(obj), id(id) {}
+    WatchKey(const WatchKey& key) : object(key.object.get()), id(key.id.get()) {}
+
+    // These are traced unconditionally during minor GC, so do not require
+    // post-barriers.
+    PreBarrieredObject object;
+    PreBarrieredId id;
+
+    bool operator!=(const WatchKey& other) const {
+        return object != other.object || id != other.id;
+    }
+};
+
+typedef bool
+(* JSWatchPointHandler)(JSContext* cx, JSObject* obj, jsid id, const JS::Value& old,
+                        JS::Value* newp, void* closure);
+
+struct Watchpoint {
+    JSWatchPointHandler handler;
+    PreBarrieredObject closure;  /* This is always marked in minor GCs and so doesn't require a postbarrier. */
+    bool held;  /* true if currently running handler */
+    Watchpoint(JSWatchPointHandler handler, JSObject* closure, bool held)
+      : handler(handler), closure(closure), held(held) {}
+};
+
+struct WatchKeyHasher
+{
+    typedef WatchKey Lookup;
+    static inline js::HashNumber hash(const Lookup& key);
+
+    static bool match(const WatchKey& k, const Lookup& l) {
+        return MovableCellHasher<PreBarrieredObject>::match(k.object, l.object) &&
+               DefaultHasher<PreBarrieredId>::match(k.id, l.id);
+    }
+
+    static void rekey(WatchKey& k, const WatchKey& newKey) {
+        k.object.unsafeSet(newKey.object);
+        k.id.unsafeSet(newKey.id);
+    }
+};
+
+class WatchpointMap {
+  public:
+    typedef HashMap<WatchKey, Watchpoint, WatchKeyHasher, SystemAllocPolicy> Map;
+
+    bool init();
+    bool watch(JSContext* cx, HandleObject obj, HandleId id,
+               JSWatchPointHandler handler, HandleObject closure);
+    void unwatch(JSObject* obj, jsid id,
+                 JSWatchPointHandler* handlerp, JSObject** closurep);
+    void unwatchObject(JSObject* obj);
+    void clear();
+
+    bool triggerWatchpoint(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp);
+
+    bool markIteratively(JSTracer* trc);
+    void markAll(JSTracer* trc);
+    static void sweepAll(JSRuntime* rt);
+    void sweep();
+
+    static void traceAll(WeakMapTracer* trc);
+    void trace(WeakMapTracer* trc);
+
+  private:
+    Map map;
+};
+
+} // namespace js
+
+#endif /* jswatchpoint_h */