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js/src/vm/SavedStacks.h@6474c204b198 (annotated)

js/src/vm/SavedStacks.h

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0 1
michael@0 2 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0 3 * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0 4 * This Source Code Form is subject to the terms of the Mozilla Public
michael@0 5 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 7
michael@0 8 #ifndef vm_SavedStacks_h
michael@0 9 #define vm_SavedStacks_h
michael@0 10
michael@0 11 #include "jscntxt.h"
michael@0 12 #include "js/HashTable.h"
michael@0 13 #include "vm/Stack.h"
michael@0 14
michael@0 15 namespace js {
michael@0 16
michael@0 17 class SavedFrame : public JSObject {
michael@0 18 friend class SavedStacks;
michael@0 19
michael@0 20 public:
michael@0 21 static const Class class_;
michael@0 22 static void finalize(FreeOp *fop, JSObject *obj);
michael@0 23
michael@0 24 // Prototype methods and properties to be exposed to JS.
michael@0 25 static const JSPropertySpec properties[];
michael@0 26 static const JSFunctionSpec methods[];
michael@0 27 static bool construct(JSContext *cx, unsigned argc, Value *vp);
michael@0 28 static bool sourceProperty(JSContext *cx, unsigned argc, Value *vp);
michael@0 29 static bool lineProperty(JSContext *cx, unsigned argc, Value *vp);
michael@0 30 static bool columnProperty(JSContext *cx, unsigned argc, Value *vp);
michael@0 31 static bool functionDisplayNameProperty(JSContext *cx, unsigned argc, Value *vp);
michael@0 32 static bool parentProperty(JSContext *cx, unsigned argc, Value *vp);
michael@0 33 static bool toStringMethod(JSContext *cx, unsigned argc, Value *vp);
michael@0 34
michael@0 35 // Convenient getters for SavedFrame's reserved slots for use from C++.
michael@0 36 JSAtom *getSource();
michael@0 37 size_t getLine();
michael@0 38 size_t getColumn();
michael@0 39 JSAtom *getFunctionDisplayName();
michael@0 40 SavedFrame *getParent();
michael@0 41 JSPrincipals *getPrincipals();
michael@0 42
michael@0 43 bool isSelfHosted();
michael@0 44
michael@0 45 struct Lookup;
michael@0 46 struct HashPolicy;
michael@0 47
michael@0 48 typedef HashSet<SavedFrame *,
michael@0 49 HashPolicy,
michael@0 50 SystemAllocPolicy> Set;
michael@0 51
michael@0 52 private:
michael@0 53 void initFromLookup(Lookup &lookup);
michael@0 54
michael@0 55 enum {
michael@0 56 // The reserved slots in the SavedFrame class.
michael@0 57 JSSLOT_SOURCE,
michael@0 58 JSSLOT_LINE,
michael@0 59 JSSLOT_COLUMN,
michael@0 60 JSSLOT_FUNCTIONDISPLAYNAME,
michael@0 61 JSSLOT_PARENT,
michael@0 62 JSSLOT_PRINCIPALS,
michael@0 63 JSSLOT_PRIVATE_PARENT,
michael@0 64
michael@0 65 // The total number of reserved slots in the SavedFrame class.
michael@0 66 JSSLOT_COUNT
michael@0 67 };
michael@0 68
michael@0 69 // Because we hash the parent pointer, we need to rekey a saved frame
michael@0 70 // whenever its parent was relocated by the GC. However, the GC doesn't
michael@0 71 // notify us when this occurs. As a work around, we keep a duplicate copy of
michael@0 72 // the parent pointer as a private value in a reserved slot. Whenever the
michael@0 73 // private value parent pointer doesn't match the regular parent pointer, we
michael@0 74 // know that GC moved the parent and we need to update our private value and
michael@0 75 // rekey the saved frame in its hash set. These two methods are helpers for
michael@0 76 // this process.
michael@0 77 bool parentMoved();
michael@0 78 void updatePrivateParent();
michael@0 79
michael@0 80 static SavedFrame *checkThis(JSContext *cx, CallArgs &args, const char *fnName);
michael@0 81 };
michael@0 82
michael@0 83 struct SavedFrame::Lookup {
michael@0 84 Lookup(JSAtom *source, size_t line, size_t column, JSAtom *functionDisplayName,
michael@0 85 Handle<SavedFrame*> parent, JSPrincipals *principals)
michael@0 86 : source(source),
michael@0 87 line(line),
michael@0 88 column(column),
michael@0 89 functionDisplayName(functionDisplayName),
michael@0 90 parent(parent),
michael@0 91 principals(principals)
michael@0 92 {
michael@0 93 JS_ASSERT(source);
michael@0 94 }
michael@0 95
michael@0 96 JSAtom *source;
michael@0 97 size_t line;
michael@0 98 size_t column;
michael@0 99 JSAtom *functionDisplayName;
michael@0 100 Handle<SavedFrame*> parent;
michael@0 101 JSPrincipals *principals;
michael@0 102 };
michael@0 103
michael@0 104 struct SavedFrame::HashPolicy
michael@0 105 {
michael@0 106 typedef SavedFrame::Lookup Lookup;
michael@0 107 typedef PointerHasher<SavedFrame *, 3> SavedFramePtrHasher;
michael@0 108 typedef PointerHasher<JSPrincipals *, 3> JSPrincipalsPtrHasher;
michael@0 109
michael@0 110 static HashNumber hash(const Lookup &lookup);
michael@0 111 static bool match(SavedFrame *existing, const Lookup &lookup);
michael@0 112
michael@0 113 typedef SavedFrame* Key;
michael@0 114 static void rekey(Key &key, const Key &newKey);
michael@0 115 };
michael@0 116
michael@0 117 class SavedStacks {
michael@0 118 public:
michael@0 119 SavedStacks() : frames(), savedFrameProto(nullptr) { }
michael@0 120
michael@0 121 bool init();
michael@0 122 bool initialized() const { return frames.initialized(); }
michael@0 123 bool saveCurrentStack(JSContext *cx, MutableHandle<SavedFrame*> frame);
michael@0 124 void sweep(JSRuntime *rt);
michael@0 125 uint32_t count();
michael@0 126 void clear();
michael@0 127
michael@0 128 size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf);
michael@0 129
michael@0 130 private:
michael@0 131 SavedFrame::Set frames;
michael@0 132 JSObject *savedFrameProto;
michael@0 133
michael@0 134 bool insertFrames(JSContext *cx, ScriptFrameIter &iter, MutableHandle<SavedFrame*> frame);
michael@0 135 SavedFrame *getOrCreateSavedFrame(JSContext *cx, SavedFrame::Lookup &lookup);
michael@0 136 // |SavedFrame.prototype| is created lazily and held weakly. It should only
michael@0 137 // be accessed through this method.
michael@0 138 JSObject *getOrCreateSavedFramePrototype(JSContext *cx);
michael@0 139 SavedFrame *createFrameFromLookup(JSContext *cx, SavedFrame::Lookup &lookup);
michael@0 140 };
michael@0 141
michael@0 142 } /* namespace js */
michael@0 143
michael@0 144 #endif /* vm_SavedStacks_h */

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