dom/xbl/nsXBLMaybeCompiled.h@6474c204b198 (annotated)
dom/xbl/nsXBLMaybeCompiled.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 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef nsXBLMaybeCompiled_h__ |
| michael@0 | 7 | #define nsXBLMaybeCompiled_h__ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "js/GCAPI.h" |
| michael@0 | 10 | |
| michael@0 | 11 | /* |
| michael@0 | 12 | * A union containing either a pointer representing uncompiled source or a |
| michael@0 | 13 | * JSObject* representing the compiled result. The class is templated on the |
| michael@0 | 14 | * source object type. |
| michael@0 | 15 | * |
| michael@0 | 16 | * The purpose of abstracting this as a separate class is to allow it to be |
| michael@0 | 17 | * wrapped in a JS::Heap<T> to correctly handle post-barriering of the JSObject |
| michael@0 | 18 | * pointer, when present. |
| michael@0 | 19 | */ |
| michael@0 | 20 | template <class UncompiledT> |
| michael@0 | 21 | class nsXBLMaybeCompiled |
| michael@0 | 22 | { |
| michael@0 | 23 | public: |
| michael@0 | 24 | nsXBLMaybeCompiled() : mUncompiled(BIT_UNCOMPILED) {} |
| michael@0 | 25 | |
| michael@0 | 26 | nsXBLMaybeCompiled(UncompiledT* uncompiled) |
| michael@0 | 27 | : mUncompiled(reinterpret_cast<uintptr_t>(uncompiled) | BIT_UNCOMPILED) {} |
| michael@0 | 28 | |
| michael@0 | 29 | nsXBLMaybeCompiled(JSObject* compiled) : mCompiled(compiled) {} |
| michael@0 | 30 | |
| michael@0 | 31 | bool IsCompiled() const |
| michael@0 | 32 | { |
| michael@0 | 33 | return !(mUncompiled & BIT_UNCOMPILED); |
| michael@0 | 34 | } |
| michael@0 | 35 | |
| michael@0 | 36 | UncompiledT* GetUncompiled() const |
| michael@0 | 37 | { |
| michael@0 | 38 | MOZ_ASSERT(!IsCompiled(), "Attempt to get compiled function as uncompiled"); |
| michael@0 | 39 | uintptr_t unmasked = mUncompiled & ~BIT_UNCOMPILED; |
| michael@0 | 40 | return reinterpret_cast<UncompiledT*>(unmasked); |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | JSObject* GetJSFunction() const |
| michael@0 | 44 | { |
| michael@0 | 45 | MOZ_ASSERT(IsCompiled(), "Attempt to get uncompiled function as compiled"); |
| michael@0 | 46 | if (mCompiled) { |
| michael@0 | 47 | JS::ExposeObjectToActiveJS(mCompiled); |
| michael@0 | 48 | } |
| michael@0 | 49 | return mCompiled; |
| michael@0 | 50 | } |
| michael@0 | 51 | |
| michael@0 | 52 | // This is appropriate for use in tracing methods, etc. |
| michael@0 | 53 | JSObject* GetJSFunctionPreserveColor() const |
| michael@0 | 54 | { |
| michael@0 | 55 | MOZ_ASSERT(IsCompiled(), "Attempt to get uncompiled function as compiled"); |
| michael@0 | 56 | return mCompiled; |
| michael@0 | 57 | } |
| michael@0 | 58 | |
| michael@0 | 59 | private: |
| michael@0 | 60 | JSObject*& UnsafeGetJSFunction() |
| michael@0 | 61 | { |
| michael@0 | 62 | MOZ_ASSERT(IsCompiled(), "Attempt to get uncompiled function as compiled"); |
| michael@0 | 63 | return mCompiled; |
| michael@0 | 64 | } |
| michael@0 | 65 | |
| michael@0 | 66 | enum { BIT_UNCOMPILED = 1 << 0 }; |
| michael@0 | 67 | |
| michael@0 | 68 | union |
| michael@0 | 69 | { |
| michael@0 | 70 | // An pointer that represents the function before being compiled, with |
| michael@0 | 71 | // BIT_UNCOMPILED set. |
| michael@0 | 72 | uintptr_t mUncompiled; |
| michael@0 | 73 | |
| michael@0 | 74 | // The JS object for the compiled result. |
| michael@0 | 75 | JSObject* mCompiled; |
| michael@0 | 76 | }; |
| michael@0 | 77 | |
| michael@0 | 78 | friend class js::GCMethods<nsXBLMaybeCompiled<UncompiledT> >; |
| michael@0 | 79 | }; |
| michael@0 | 80 | |
| michael@0 | 81 | /* Add support for JS::Heap<nsXBLMaybeCompiled>. */ |
| michael@0 | 82 | namespace js { |
| michael@0 | 83 | |
| michael@0 | 84 | template <class UncompiledT> |
| michael@0 | 85 | struct GCMethods<nsXBLMaybeCompiled<UncompiledT> > : public GCMethods<JSObject *> |
| michael@0 | 86 | { |
| michael@0 | 87 | typedef struct GCMethods<JSObject *> Base; |
| michael@0 | 88 | |
| michael@0 | 89 | static nsXBLMaybeCompiled<UncompiledT> initial() { return nsXBLMaybeCompiled<UncompiledT>(); } |
| michael@0 | 90 | |
| michael@0 | 91 | static bool poisoned(nsXBLMaybeCompiled<UncompiledT> function) |
| michael@0 | 92 | { |
| michael@0 | 93 | return function.IsCompiled() && Base::poisoned(function.GetJSFunction()); |
| michael@0 | 94 | } |
| michael@0 | 95 | |
| michael@0 | 96 | static bool needsPostBarrier(nsXBLMaybeCompiled<UncompiledT> function) |
| michael@0 | 97 | { |
| michael@0 | 98 | return function.IsCompiled() && Base::needsPostBarrier(function.GetJSFunction()); |
| michael@0 | 99 | } |
| michael@0 | 100 | |
| michael@0 | 101 | #ifdef JSGC_GENERATIONAL |
| michael@0 | 102 | static void postBarrier(nsXBLMaybeCompiled<UncompiledT>* functionp) |
| michael@0 | 103 | { |
| michael@0 | 104 | Base::postBarrier(&functionp->UnsafeGetJSFunction()); |
| michael@0 | 105 | } |
| michael@0 | 106 | |
| michael@0 | 107 | static void relocate(nsXBLMaybeCompiled<UncompiledT>* functionp) |
| michael@0 | 108 | { |
| michael@0 | 109 | Base::relocate(&functionp->UnsafeGetJSFunction()); |
| michael@0 | 110 | } |
| michael@0 | 111 | #endif |
| michael@0 | 112 | }; |
| michael@0 | 113 | |
| michael@0 | 114 | template <class UncompiledT> |
| michael@0 | 115 | class HeapBase<nsXBLMaybeCompiled<UncompiledT> > |
| michael@0 | 116 | { |
| michael@0 | 117 | const JS::Heap<nsXBLMaybeCompiled<UncompiledT> >& wrapper() const { |
| michael@0 | 118 | return *static_cast<const JS::Heap<nsXBLMaybeCompiled<UncompiledT> >*>(this); |
| michael@0 | 119 | } |
| michael@0 | 120 | |
| michael@0 | 121 | JS::Heap<nsXBLMaybeCompiled<UncompiledT> >& wrapper() { |
| michael@0 | 122 | return *static_cast<JS::Heap<nsXBLMaybeCompiled<UncompiledT> >*>(this); |
| michael@0 | 123 | } |
| michael@0 | 124 | |
| michael@0 | 125 | const nsXBLMaybeCompiled<UncompiledT>* extract() const { |
| michael@0 | 126 | return wrapper().address(); |
| michael@0 | 127 | } |
| michael@0 | 128 | |
| michael@0 | 129 | nsXBLMaybeCompiled<UncompiledT>* extract() { |
| michael@0 | 130 | return wrapper().unsafeGet(); |
| michael@0 | 131 | } |
| michael@0 | 132 | |
| michael@0 | 133 | public: |
| michael@0 | 134 | bool IsCompiled() const { return extract()->IsCompiled(); } |
| michael@0 | 135 | UncompiledT* GetUncompiled() const { return extract()->GetUncompiled(); } |
| michael@0 | 136 | JSObject* GetJSFunction() const { return extract()->GetJSFunction(); } |
| michael@0 | 137 | JSObject* GetJSFunctionPreserveColor() const { return extract()->GetJSFunctionPreserveColor(); } |
| michael@0 | 138 | |
| michael@0 | 139 | void SetUncompiled(UncompiledT* source) { |
| michael@0 | 140 | wrapper().set(nsXBLMaybeCompiled<UncompiledT>(source)); |
| michael@0 | 141 | } |
| michael@0 | 142 | |
| michael@0 | 143 | void SetJSFunction(JSObject* function) { |
| michael@0 | 144 | wrapper().set(nsXBLMaybeCompiled<UncompiledT>(function)); |
| michael@0 | 145 | } |
| michael@0 | 146 | |
| michael@0 | 147 | JS::Heap<JSObject*>& AsHeapObject() |
| michael@0 | 148 | { |
| michael@0 | 149 | MOZ_ASSERT(extract()->IsCompiled()); |
| michael@0 | 150 | return *reinterpret_cast<JS::Heap<JSObject*>*>(this); |
| michael@0 | 151 | } |
| michael@0 | 152 | }; |
| michael@0 | 153 | |
| michael@0 | 154 | } /* namespace js */ |
| michael@0 | 155 | |
| michael@0 | 156 | #endif // nsXBLMaybeCompiled_h__ |
