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Properly flag opaque existential types as not being

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bitwise-takable.

Swift SVN r20803
This commit is contained in:
John McCall
2014-07-31 02:03:56 +00:00
parent 36a27a61a4
commit c367362f22
5 changed files with 106 additions and 6 deletions
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8
stdlib/runtime/MetadataImpl.h
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@@ -103,6 +103,7 @@ struct NativeBox {
static constexpr size_t alignment = Alignment;
static constexpr size_t stride = Stride;
static constexpr size_t isPOD = std::is_pod<T>::value;
static constexpr bool isBitwiseTakable = isPOD;
static constexpr unsigned numExtraInhabitants = 0;
static void destroy(T *value) {
@@ -197,6 +198,7 @@ template <class Impl, class T> struct RetainableBoxBase {
static constexpr size_t alignment = alignof(T);
static constexpr size_t stride = sizeof(T);
static constexpr bool isPOD = false;
static constexpr bool isBitwiseTakable = true;
static void destroy(T *addr) {
Impl::release(*addr);
@@ -339,6 +341,7 @@ public:
static constexpr size_t endOffset = StartOffset;
static constexpr size_t alignment = 1;
static constexpr bool isPOD = true;
static constexpr bool isBitwiseTakable = true;
public:
#define COPY_OP(OP) \
@@ -370,6 +373,8 @@ public:
(NextHelper::alignment > EltBox::alignment
? NextHelper::alignment : EltBox::alignment);
static constexpr bool isPOD = EltBox::isPOD && NextHelper::isPOD;
static constexpr bool isBitwiseTakable =
EltBox::isBitwiseTakable && NextHelper::isBitwiseTakable;
private:
static constexpr size_t eltToNextOffset = (nextOffset - eltOffset);
@@ -412,6 +417,7 @@ struct AggregateBox {
static constexpr size_t alignment = Helper::alignment;
static constexpr size_t stride = roundUpToAlignment(size, alignment);
static constexpr bool isPOD = Helper::isPOD;
static constexpr bool isBitwiseTakable = Helper::isBitwiseTakable;
/// Don't collect extra inhabitants from the members by default.
static constexpr unsigned numExtraInhabitants = 0;
@@ -659,12 +665,14 @@ struct ValueWitnesses : BufferValueWitnesses<ValueWitnesses<Box>,
static constexpr size_t stride = Box::stride;
static constexpr size_t alignment = Box::alignment;
static constexpr bool isPOD = Box::isPOD;
static constexpr bool isBitwiseTakable = Box::isBitwiseTakable;
static constexpr unsigned numExtraInhabitants = Box::numExtraInhabitants;
static constexpr bool hasExtraInhabitants = (numExtraInhabitants != 0);
static constexpr ValueWitnessFlags flags =
ValueWitnessFlags().withAlignmentMask(alignment - 1)
.withInlineStorage(Base::isInline)
.withPOD(isPOD)
.withBitwiseTakable(isBitwiseTakable)
.withExtraInhabitants(hasExtraInhabitants);
static constexpr ExtraInhabitantFlags extraInhabitantFlags =
ExtraInhabitantFlags().withNumExtraInhabitants(numExtraInhabitants);