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Bug 805988. Add some asserts that new-binding objects are nsISupports if they claim to be or or can be safely reinterpret_cast to nsWrapperCache, if they have an nsWrapperCache at all, if they don't claim to be nsISupports. r=peterv

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Note that everything except the new asserts just got moved with no changes.
This commit is contained in:
Boris Zbarsky 2012-11-08 23:48:42 -08:00
parent 75b79a780d
commit bd227d01e5
1 changed files with 76 additions and 58 deletions
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134
dom/bindings/BindingUtils.h
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@ -409,6 +409,64 @@ MaybeWrapValue(JSContext* cx, JSObject* obj, JS::Value* vp)
return true;
}
#ifdef _MSC_VER
#define HAS_MEMBER_CHECK(_name) \
template<typename V> static yes& Check(char (*)[(&V::_name == 0) + 1])
#else
#define HAS_MEMBER_CHECK(_name) \
template<typename V> static yes& Check(char (*)[sizeof(&V::_name) + 1])
#endif
#define HAS_MEMBER(_name) \
template<typename T> \
class Has##_name##Member { \
typedef char yes[1]; \
typedef char no[2]; \
HAS_MEMBER_CHECK(_name); \
template<typename V> static no& Check(...); \
\
public: \
static bool const Value = sizeof(Check<T>(nullptr)) == sizeof(yes); \
};
HAS_MEMBER(AddRef)
HAS_MEMBER(Release)
HAS_MEMBER(QueryInterface)
template<typename T>
struct IsRefCounted
{
static bool const Value = HasAddRefMember<T>::Value &&
HasReleaseMember<T>::Value;
};
template<typename T>
struct IsISupports
{
static bool const Value = IsRefCounted<T>::Value &&
HasQueryInterfaceMember<T>::Value;
};
HAS_MEMBER(WrapObject)
// HasWrapObject<T>::Value will be true if T has a WrapObject member but it's
// not nsWrapperCache::WrapObject.
template<typename T>
struct HasWrapObject
{
private:
typedef char yes[1];
typedef char no[2];
typedef JSObject* (nsWrapperCache::*WrapObject)(JSContext*, JSObject*, bool*);
template<typename U, U> struct SFINAE;
template <typename V> static no& Check(SFINAE<WrapObject, &V::WrapObject>*);
template <typename V> static yes& Check(...);
public:
static bool const Value = HasWrapObjectMember<T>::Value &&
sizeof(Check<T>(nullptr)) == sizeof(yes);
};
template <class T>
inline bool
WrapNewBindingObject(JSContext* cx, JSObject* scope, T* value, JS::Value* vp)
@ -431,6 +489,24 @@ WrapNewBindingObject(JSContext* cx, JSObject* scope, T* value, JS::Value* vp)
}
}
#ifdef DEBUG
// Some sanity asserts about our object. Specifically:
// 1) If our class claims we're nsISupports, we better be nsISupports
// XXXbz ideally, we could assert that reinterpret_cast to nsISupports
// does the right thing, but I don't see a way to do it. :(
// 2) If our class doesn't claim we're nsISupports we better be
// reinterpret_castable to nsWrapperCache.
const DOMClass* clasp = nullptr;
DOMObjectSlot slot = GetDOMClass(obj, clasp);
MOZ_ASSERT(slot != eNonDOMObject, "Totally unexpected object here");
MOZ_ASSERT(clasp, "What happened here?");
MOZ_ASSERT_IF(clasp->mDOMObjectIsISupports, IsISupports<T>::Value);
MOZ_ASSERT_IF(!clasp->mDOMObjectIsISupports,
reinterpret_cast<uintptr_t>(
static_cast<nsWrapperCache*>(
reinterpret_cast<T*>(1))) == 1);
#endif
// When called via XrayWrapper, we end up here while running in the
// chrome compartment. But the obj we have would be created in
// whatever the content compartment is. So at this point we need to
@ -745,64 +821,6 @@ bool
WrapCallbackInterface(JSContext *cx, JSObject *scope, nsISupports* callback,
JS::Value* vp);
#ifdef _MSC_VER
#define HAS_MEMBER_CHECK(_name) \
template<typename V> static yes& Check(char (*)[(&V::_name == 0) + 1])
#else
#define HAS_MEMBER_CHECK(_name) \
template<typename V> static yes& Check(char (*)[sizeof(&V::_name) + 1])
#endif
#define HAS_MEMBER(_name) \
template<typename T> \
class Has##_name##Member { \
typedef char yes[1]; \
typedef char no[2]; \
HAS_MEMBER_CHECK(_name); \
template<typename V> static no& Check(...); \
\
public: \
static bool const Value = sizeof(Check<T>(nullptr)) == sizeof(yes); \
};
HAS_MEMBER(AddRef)
HAS_MEMBER(Release)
HAS_MEMBER(QueryInterface)
template<typename T>
struct IsRefCounted
{
static bool const Value = HasAddRefMember<T>::Value &&
HasReleaseMember<T>::Value;
};
template<typename T>
struct IsISupports
{
static bool const Value = IsRefCounted<T>::Value &&
HasQueryInterfaceMember<T>::Value;
};
HAS_MEMBER(WrapObject)
// HasWrapObject<T>::Value will be true if T has a WrapObject member but it's
// not nsWrapperCache::WrapObject.
template<typename T>
struct HasWrapObject
{
private:
typedef char yes[1];
typedef char no[2];
typedef JSObject* (nsWrapperCache::*WrapObject)(JSContext*, JSObject*, bool*);
template<typename U, U> struct SFINAE;
template <typename V> static no& Check(SFINAE<WrapObject, &V::WrapObject>*);
template <typename V> static yes& Check(...);
public:
static bool const Value = HasWrapObjectMember<T>::Value &&
sizeof(Check<T>(nullptr)) == sizeof(yes);
};
template<typename T>
static inline JSObject*
WrapNativeISupportsParent(JSContext* cx, JSObject* scope, T* p,