111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "vm/RegExpStatics.h"
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#include "vm/RegExpStaticsObject.h"
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#include "vm/NativeObject-inl.h"
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using namespace js;
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/*
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* RegExpStatics allocates memory -- in order to keep the statics stored
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* per-global and not leak, we create a js::Class to wrap the C++ instance and
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* provide an appropriate finalizer. We lazily create and store an instance of
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* that js::Class in a global reserved slot.
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*/
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static void
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resc_finalize(FreeOp* fop, JSObject* obj)
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{
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MOZ_ASSERT(fop->onMainThread());
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RegExpStatics* res = static_cast<RegExpStatics*>(obj->as<RegExpStaticsObject>().getPrivate());
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fop->delete_(res);
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}
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static void
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resc_trace(JSTracer* trc, JSObject* obj)
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{
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void* pdata = obj->as<RegExpStaticsObject>().getPrivate();
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if (pdata)
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static_cast<RegExpStatics*>(pdata)->mark(trc);
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}
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static const ClassOps RegExpStaticsObjectClassOps = {
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nullptr, /* addProperty */
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nullptr, /* delProperty */
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nullptr, /* getProperty */
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nullptr, /* setProperty */
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nullptr, /* enumerate */
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nullptr, /* resolve */
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nullptr, /* mayResolve */
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resc_finalize,
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nullptr, /* call */
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nullptr, /* hasInstance */
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nullptr, /* construct */
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resc_trace
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};
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const Class RegExpStaticsObject::class_ = {
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"RegExpStatics",
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JSCLASS_HAS_PRIVATE |
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JSCLASS_FOREGROUND_FINALIZE,
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&RegExpStaticsObjectClassOps
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};
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RegExpStaticsObject*
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RegExpStatics::create(ExclusiveContext* cx, Handle<GlobalObject*> parent)
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{
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RegExpStaticsObject* obj = NewObjectWithGivenProto<RegExpStaticsObject>(cx, nullptr);
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if (!obj)
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return nullptr;
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RegExpStatics* res = cx->new_<RegExpStatics>();
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if (!res)
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return nullptr;
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obj->setPrivate(static_cast<void*>(res));
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return obj;
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}
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bool
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RegExpStatics::executeLazy(JSContext* cx)
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{
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if (!pendingLazyEvaluation)
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return true;
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MOZ_ASSERT(lazySource);
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MOZ_ASSERT(matchesInput);
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MOZ_ASSERT(lazyIndex != size_t(-1));
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/* Retrieve or create the RegExpShared in this compartment. */
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RegExpGuard g(cx);
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if (!cx->compartment()->regExps.get(cx, lazySource, lazyFlags, &g))
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return false;
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/*
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* It is not necessary to call aboutToWrite(): evaluation of
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* implicit copies is safe.
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*/
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/* Execute the full regular expression. */
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RootedLinearString input(cx, matchesInput);
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RegExpRunStatus status = g->execute(cx, input, lazyIndex, &this->matches, nullptr);
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if (status == RegExpRunStatus_Error)
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return false;
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/*
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* RegExpStatics are only updated on successful (matching) execution.
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* Re-running the same expression must therefore produce a matching result.
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*/
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MOZ_ASSERT(status == RegExpRunStatus_Success);
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/* Unset lazy state and remove rooted values that now have no use. */
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pendingLazyEvaluation = false;
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lazySource = nullptr;
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lazyIndex = size_t(-1);
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return true;
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}
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