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Bug 1136768 - Tidy detection of possibly relocated types r=terrence

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This commit is contained in:
Jon Coppeard 2015-02-26 09:04:46 +00:00
parent f9426664ae
commit e179561dba
1 changed files with 10 additions and 18 deletions
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28
js/src/jsgc.h
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@ -1190,31 +1190,23 @@ class RelocationOverlay
/* Functions for checking and updating things that might be moved by compacting GC. */
#define TYPE_MIGHT_BE_FORWARDED(T, value) \
inline bool \
TypeMightBeForwarded(T *thing) \
{ \
return value; \
} \
template <typename T>
struct MightBeForwarded
{
static_assert(mozilla::IsBaseOf<Cell, T>::value,
"T must derive from Cell");
static_assert(!mozilla::IsSame<Cell, T>::value && !mozilla::IsSame<TenuredCell, T>::value,
"T must not be Cell or TenuredCell");
TYPE_MIGHT_BE_FORWARDED(JSObject, true)
TYPE_MIGHT_BE_FORWARDED(JSString, false)
TYPE_MIGHT_BE_FORWARDED(JS::Symbol, false)
TYPE_MIGHT_BE_FORWARDED(JSScript, false)
TYPE_MIGHT_BE_FORWARDED(Shape, false)
TYPE_MIGHT_BE_FORWARDED(BaseShape, false)
TYPE_MIGHT_BE_FORWARDED(jit::JitCode, false)
TYPE_MIGHT_BE_FORWARDED(LazyScript, false)
TYPE_MIGHT_BE_FORWARDED(ObjectGroup, false)
#undef TYPE_MIGHT_BE_FORWARDED
static const bool value = mozilla::IsBaseOf<JSObject, T>::value;
};
template <typename T>
inline bool
IsForwarded(T *t)
{
RelocationOverlay *overlay = RelocationOverlay::fromCell(t);
if (!TypeMightBeForwarded(t)) {
if (!MightBeForwarded<T>::value) {
MOZ_ASSERT(!overlay->isForwarded());
return false;
}