Add m-esr52 at 52.6.0

1 files changed, 111 insertions, 0 deletions

diff --git a/js/src/vm/RegExpStatics.cpp b/js/src/vm/RegExpStatics.cpp
new file mode 100644
index 000000000..5375c0039
--- /dev/null
+++ b/js/src/vm/RegExpStatics.cpp
@@ -0,0 +1,111 @@
+/* -*- 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/. */
+
+#include "vm/RegExpStatics.h"
+
+#include "vm/RegExpStaticsObject.h"
+
+#include "vm/NativeObject-inl.h"
+
+using namespace js;
+
+/*
+ * RegExpStatics allocates memory -- in order to keep the statics stored
+ * per-global and not leak, we create a js::Class to wrap the C++ instance and
+ * provide an appropriate finalizer. We lazily create and store an instance of
+ * that js::Class in a global reserved slot.
+ */
+
+static void
+resc_finalize(FreeOp* fop, JSObject* obj)
+{
+    MOZ_ASSERT(fop->onMainThread());
+    RegExpStatics* res = static_cast<RegExpStatics*>(obj->as<RegExpStaticsObject>().getPrivate());
+    fop->delete_(res);
+}
+
+static void
+resc_trace(JSTracer* trc, JSObject* obj)
+{
+    void* pdata = obj->as<RegExpStaticsObject>().getPrivate();
+    if (pdata)
+        static_cast<RegExpStatics*>(pdata)->mark(trc);
+}
+
+static const ClassOps RegExpStaticsObjectClassOps = {
+    nullptr, /* addProperty */
+    nullptr, /* delProperty */
+    nullptr, /* getProperty */
+    nullptr, /* setProperty */
+    nullptr, /* enumerate */
+    nullptr, /* resolve */
+    nullptr, /* mayResolve */
+    resc_finalize,
+    nullptr, /* call */
+    nullptr, /* hasInstance */
+    nullptr, /* construct */
+    resc_trace
+};
+
+const Class RegExpStaticsObject::class_ = {
+    "RegExpStatics",
+    JSCLASS_HAS_PRIVATE |
+    JSCLASS_FOREGROUND_FINALIZE,
+    &RegExpStaticsObjectClassOps
+};
+
+RegExpStaticsObject*
+RegExpStatics::create(ExclusiveContext* cx, Handle<GlobalObject*> parent)
+{
+    RegExpStaticsObject* obj = NewObjectWithGivenProto<RegExpStaticsObject>(cx, nullptr);
+    if (!obj)
+        return nullptr;
+    RegExpStatics* res = cx->new_<RegExpStatics>();
+    if (!res)
+        return nullptr;
+    obj->setPrivate(static_cast<void*>(res));
+    return obj;
+}
+
+bool
+RegExpStatics::executeLazy(JSContext* cx)
+{
+    if (!pendingLazyEvaluation)
+        return true;
+
+    MOZ_ASSERT(lazySource);
+    MOZ_ASSERT(matchesInput);
+    MOZ_ASSERT(lazyIndex != size_t(-1));
+
+    /* Retrieve or create the RegExpShared in this compartment. */
+    RegExpGuard g(cx);
+    if (!cx->compartment()->regExps.get(cx, lazySource, lazyFlags, &g))
+        return false;
+
+    /*
+     * It is not necessary to call aboutToWrite(): evaluation of
+     * implicit copies is safe.
+     */
+
+    /* Execute the full regular expression. */
+    RootedLinearString input(cx, matchesInput);
+    RegExpRunStatus status = g->execute(cx, input, lazyIndex, &this->matches, nullptr);
+    if (status == RegExpRunStatus_Error)
+        return false;
+
+    /*
+     * RegExpStatics are only updated on successful (matching) execution.
+     * Re-running the same expression must therefore produce a matching result.
+     */
+    MOZ_ASSERT(status == RegExpRunStatus_Success);
+
+    /* Unset lazy state and remove rooted values that now have no use. */
+    pendingLazyEvaluation = false;
+    lazySource = nullptr;
+    lazyIndex = size_t(-1);
+
+    return true;
+}