The Tor Browser: js/src/vm/SavedStacks.h@129ffea94266 (annotated)

js/src/vm/SavedStacks.h@129ffea94266 (annotated)

js/src/vm/SavedStacks.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * 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/. */
 #ifndef vm_SavedStacks_h
 #define vm_SavedStacks_h
 #include "jscntxt.h"
 #include "js/HashTable.h"
 #include "vm/Stack.h"
 namespace js {
 class SavedFrame : public JSObject {
     friend class SavedStacks;
   public:
     static const Class          class_;
     static void finalize(FreeOp *fop, JSObject *obj);
     // Prototype methods and properties to be exposed to JS.
     static const JSPropertySpec properties[];
     static const JSFunctionSpec methods[];
     static bool construct(JSContext *cx, unsigned argc, Value *vp);
     static bool sourceProperty(JSContext *cx, unsigned argc, Value *vp);
     static bool lineProperty(JSContext *cx, unsigned argc, Value *vp);
     static bool columnProperty(JSContext *cx, unsigned argc, Value *vp);
     static bool functionDisplayNameProperty(JSContext *cx, unsigned argc, Value *vp);
     static bool parentProperty(JSContext *cx, unsigned argc, Value *vp);
     static bool toStringMethod(JSContext *cx, unsigned argc, Value *vp);
     // Convenient getters for SavedFrame's reserved slots for use from C++.
     JSAtom       *getSource();
     size_t       getLine();
     size_t       getColumn();
     JSAtom       *getFunctionDisplayName();
     SavedFrame   *getParent();
     JSPrincipals *getPrincipals();
     bool         isSelfHosted();
     struct Lookup;
     struct HashPolicy;
     typedef HashSet<SavedFrame *,
                     HashPolicy,
                     SystemAllocPolicy> Set;
   private:
     void initFromLookup(Lookup &lookup);
     enum {
         // The reserved slots in the SavedFrame class.
         JSSLOT_SOURCE,
         JSSLOT_LINE,
         JSSLOT_COLUMN,
         JSSLOT_FUNCTIONDISPLAYNAME,
         JSSLOT_PARENT,
         JSSLOT_PRINCIPALS,
         JSSLOT_PRIVATE_PARENT,
         // The total number of reserved slots in the SavedFrame class.
         JSSLOT_COUNT
     };
     // Because we hash the parent pointer, we need to rekey a saved frame
     // whenever its parent was relocated by the GC. However, the GC doesn't
     // notify us when this occurs. As a work around, we keep a duplicate copy of
     // the parent pointer as a private value in a reserved slot. Whenever the
     // private value parent pointer doesn't match the regular parent pointer, we
     // know that GC moved the parent and we need to update our private value and
     // rekey the saved frame in its hash set. These two methods are helpers for
     // this process.
     bool         parentMoved();
     void         updatePrivateParent();
     static SavedFrame *checkThis(JSContext *cx, CallArgs &args, const char *fnName);
 };
 struct SavedFrame::Lookup {
     Lookup(JSAtom *source, size_t line, size_t column, JSAtom *functionDisplayName,
            Handle<SavedFrame*> parent, JSPrincipals *principals)
         : source(source),
           line(line),
           column(column),
           functionDisplayName(functionDisplayName),
           parent(parent),
           principals(principals)
     {
         JS_ASSERT(source);
     }
     JSAtom              *source;
     size_t              line;
     size_t              column;
     JSAtom              *functionDisplayName;
     Handle<SavedFrame*> parent;
     JSPrincipals        *principals;
 };
 struct SavedFrame::HashPolicy
 {
     typedef SavedFrame::Lookup               Lookup;
     typedef PointerHasher<SavedFrame *, 3>   SavedFramePtrHasher;
     typedef PointerHasher<JSPrincipals *, 3> JSPrincipalsPtrHasher;
     static HashNumber hash(const Lookup &lookup);
     static bool       match(SavedFrame *existing, const Lookup &lookup);
     typedef SavedFrame* Key;
     static void rekey(Key &key, const Key &newKey);
 };
 class SavedStacks {
   public:
     SavedStacks() : frames(), savedFrameProto(nullptr) { }
     bool     init();
     bool     initialized() const { return frames.initialized(); }
     bool     saveCurrentStack(JSContext *cx, MutableHandle<SavedFrame*> frame);
     void     sweep(JSRuntime *rt);
     uint32_t count();
     void     clear();
     size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf);
   private:
     SavedFrame::Set          frames;
     JSObject                 *savedFrameProto;
     bool       insertFrames(JSContext *cx, ScriptFrameIter &iter, MutableHandle<SavedFrame*> frame);
     SavedFrame *getOrCreateSavedFrame(JSContext *cx, SavedFrame::Lookup &lookup);
     // |SavedFrame.prototype| is created lazily and held weakly. It should only
     // be accessed through this method.
     JSObject   *getOrCreateSavedFramePrototype(JSContext *cx);
     SavedFrame *createFrameFromLookup(JSContext *cx, SavedFrame::Lookup &lookup);
 };
 } /* namespace js */
 #endif /* vm_SavedStacks_h */

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js/src/vm/SavedStacks.h@129ffea94266 (annotated)

js/src/vm/SavedStacks.h