author Jan de Mooij <>
Sat, 12 Jan 2019 10:50:04 +0000
changeset 453631 cfa1c48c717048f00eb4811b5719cd716eb1e5b3
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
child 469755 39a877972476f803ab949b2ef56a588881252c19
permissions -rw-r--r--
Bug 1518753 part 5 - Stop using JSProtoKey for initial shapes. r=tcampbell I added this optimization in bug 1299107 to share more shapes across compartments. Unfortunately this doesn't play well with same-compartment realms (ICs can misbehave) because it relies on compartments being isolated from each other. I think we should remove this optimization: * Fixing the IC issue is impossible without deoptimizing everything. * I added it mainly for chrome globals. The shared-JSM-global work has eliminated the need for this there. * Same-compartment realms win memory back by eliminating CCWs etc. * It's quite a lot of complicated code. Differential Revision:

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */
/* describes principals by their orginating uris*/

#ifndef nsJSPrincipals_h__
#define nsJSPrincipals_h__
#include "jsapi.h"
#include "nsIPrincipal.h"

class nsJSPrincipals : public nsIPrincipal, public JSPrincipals {
  /* SpiderMonkey security callbacks. */
  static bool Subsume(JSPrincipals* jsprin, JSPrincipals* other);
  static void Destroy(JSPrincipals* jsprin);

  /* JSReadPrincipalsOp for nsJSPrincipals */
  static bool ReadPrincipals(JSContext* aCx, JSStructuredCloneReader* aReader,
                             JSPrincipals** aOutPrincipals);

  static bool ReadKnownPrincipalType(JSContext* aCx,
                                     JSStructuredCloneReader* aReader,
                                     uint32_t aTag,
                                     JSPrincipals** aOutPrincipals);

  bool write(JSContext* aCx, JSStructuredCloneWriter* aWriter) final;

   * Get a weak reference to nsIPrincipal associated with the given JS
   * principal, and vice-versa.
  static nsJSPrincipals* get(JSPrincipals* principals) {
    nsJSPrincipals* self = static_cast<nsJSPrincipals*>(principals);
    MOZ_ASSERT_IF(self, self->debugToken == DEBUG_TOKEN);
    return self;
  static nsJSPrincipals* get(nsIPrincipal* principal) {
    nsJSPrincipals* self = static_cast<nsJSPrincipals*>(principal);
    MOZ_ASSERT_IF(self, self->debugToken == DEBUG_TOKEN);
    return self;

  NS_IMETHOD_(MozExternalRefCountType) AddRef(void) override;
  NS_IMETHOD_(MozExternalRefCountType) Release(void) override;

  nsJSPrincipals() {
    refcount = 0;

   * Return a string that can be used as JS script filename in error reports.
  virtual nsresult GetScriptLocation(nsACString& aStr) = 0;
  static const uint32_t DEBUG_TOKEN = 0x0bf41760;

  virtual ~nsJSPrincipals() { setDebugToken(0); }

#endif /* nsJSPrincipals_h__ */