tor-browser

The Tor Browser
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Realm-inl.h (3373B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
      2 * vim: set ts=8 sts=2 et sw=2 tw=80:
      3 * This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef vm_Realm_inl_h
      8 #define vm_Realm_inl_h
      9 
     10 #include "vm/Realm.h"
     11 
     12 #include "gc/Barrier.h"
     13 #include "gc/Marking.h"
     14 #include "vm/GlobalObject.h"
     15 
     16 #include "vm/JSContext-inl.h"
     17 
     18 inline void JS::Realm::initGlobal(js::GlobalObject& global) {
     19  MOZ_ASSERT(global.realm() == this);
     20  MOZ_ASSERT(!global_);
     21  global_.set(&global);
     22 }
     23 
     24 js::GlobalObject* JS::Realm::maybeGlobal() const {
     25  MOZ_ASSERT_IF(global_, global_->realm() == this);
     26  return global_;
     27 }
     28 
     29 inline bool JS::Realm::hasLiveGlobal() const {
     30  // The global is swept by traceWeakGlobalEdge when we start sweeping a zone
     31  // group. This frees the GlobalObjectData, so the realm must live at least as
     32  // long as the global.
     33  MOZ_ASSERT_IF(global_, !js::gc::IsAboutToBeFinalized(global_));
     34  return bool(global_);
     35 }
     36 
     37 inline bool JS::Realm::hasInitializedGlobal() const {
     38  return hasLiveGlobal() && !initializingGlobal_;
     39 }
     40 
     41 inline bool JS::Realm::marked() const {
     42  // The Realm survives in the following cases:
     43  //  - its global is live
     44  //  - it has been entered (to ensure we don't destroy the Realm while we're
     45  //    allocating its global)
     46  //  - it was allocated after the start of an incremental GC (as there may be
     47  //    pointers to it from other GC things)
     48  return hasLiveGlobal() || hasBeenEnteredIgnoringJit() ||
     49         allocatedDuringIncrementalGC_;
     50 }
     51 
     52 /* static */ inline js::ObjectRealm& js::ObjectRealm::get(const JSObject* obj) {
     53  // Note: obj might be a CCW if we're accessing ObjectRealm::enumerators.
     54  // CCWs here are fine because we always return the same ObjectRealm for a
     55  // particular (CCW) object.
     56  return obj->maybeCCWRealm()->objects_;
     57 }
     58 
     59 template <typename T>
     60 js::AutoRealm::AutoRealm(JSContext* cx, const T& target)
     61    : cx_(cx), origin_(cx->realm()) {
     62  cx_->enterRealmOf(target);
     63 }
     64 
     65 // Protected constructor that bypasses assertions in enterRealmOf.
     66 js::AutoRealm::AutoRealm(JSContext* cx, JS::Realm* target)
     67    : cx_(cx), origin_(cx->realm()) {
     68  cx_->enterRealm(target);
     69 }
     70 
     71 js::AutoRealm::~AutoRealm() { cx_->leaveRealm(origin_); }
     72 
     73 js::AutoFunctionOrCurrentRealm::AutoFunctionOrCurrentRealm(JSContext* cx,
     74                                                           HandleObject fun) {
     75  JS::Realm* realm = JS::GetFunctionRealm(cx, fun);
     76  if (!realm) {
     77    cx->clearPendingException();
     78    return;
     79  }
     80 
     81  // Enter the function's realm.
     82  ar_.emplace(cx, realm);
     83 }
     84 
     85 js::AutoAllocInAtomsZone::AutoAllocInAtomsZone(JSContext* cx)
     86    : cx_(cx), origin_(cx->realm()) {
     87  cx_->enterAtomsZone();
     88 }
     89 
     90 js::AutoAllocInAtomsZone::~AutoAllocInAtomsZone() {
     91  cx_->leaveAtomsZone(origin_);
     92 }
     93 
     94 js::AutoMaybeLeaveAtomsZone::AutoMaybeLeaveAtomsZone(JSContext* cx)
     95    : cx_(cx), wasInAtomsZone_(cx->zone() && cx->zone()->isAtomsZone()) {
     96  if (wasInAtomsZone_) {
     97    cx_->leaveAtomsZone(nullptr);
     98  }
     99 }
    100 
    101 js::AutoMaybeLeaveAtomsZone::~AutoMaybeLeaveAtomsZone() {
    102  if (wasInAtomsZone_) {
    103    cx_->enterAtomsZone();
    104  }
    105 }
    106 
    107 js::AutoRealmUnchecked::AutoRealmUnchecked(JSContext* cx, JS::Realm* target)
    108    : AutoRealm(cx, target) {}
    109 
    110 #endif /* vm_Realm_inl_h */