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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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 "gc/FreeOp.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 JSClass to wrap the C++ instance and
* provide an appropriate finalizer. We lazily create and store an instance of
* that JSClass in a global reserved slot.
*/
static void resc_finalize(JSFreeOp* fop, JSObject* obj) {
MOZ_ASSERT(fop->onMainThread());
RegExpStatics* res =
static_cast<RegExpStatics*>(obj->as<RegExpStaticsObject>().getPrivate());
fop->delete_(obj, res, MemoryUse::RegExpStatics);
}
static void resc_trace(JSTracer* trc, JSObject* obj) {
void* pdata = obj->as<RegExpStaticsObject>().getPrivate();
if (pdata) {
static_cast<RegExpStatics*>(pdata)->trace(trc);
}
}
static const JSClassOps RegExpStaticsObjectClassOps = {
nullptr, // addProperty
nullptr, // delProperty
nullptr, // enumerate
nullptr, // newEnumerate
nullptr, // resolve
nullptr, // mayResolve
resc_finalize, // finalize
nullptr, // call
nullptr, // hasInstance
nullptr, // construct
resc_trace, // trace
};
const JSClass RegExpStaticsObject::class_ = {
"RegExpStatics", JSCLASS_HAS_PRIVATE | JSCLASS_FOREGROUND_FINALIZE,
&RegExpStaticsObjectClassOps};
RegExpStaticsObject* RegExpStatics::create(JSContext* cx) {
RegExpStaticsObject* obj =
NewObjectWithGivenProto<RegExpStaticsObject>(cx, nullptr);
if (!obj) {
return nullptr;
}
RegExpStatics* res = cx->new_<RegExpStatics>();
if (!res) {
return nullptr;
}
// TODO: This doesn't account for match vector heap memory used if there are
// more 10 matches. This is likely to be rare.
InitObjectPrivate(obj, res, MemoryUse::RegExpStatics);
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 zone. */
RootedAtom source(cx, lazySource);
RootedRegExpShared shared(cx,
cx->zone()->regExps().get(cx, source, lazyFlags));
if (!shared) {
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 =
RegExpShared::execute(cx, &shared, input, lazyIndex, &this->matches);
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;
}