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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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;
}
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