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IRGen: Emit protocol descriptors.

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Produce protocol descriptors when we see a protocol definition in the current module. If the protocol is @objc, go through the existing path for generating full Protocol* metadata for objc objects; otherwise, emit our layout-compatible but strong-external-linkage Swift protocol descriptor record.

Swift SVN r9867
This commit is contained in:
Joe Groff
2013-11-01 04:28:43 +00:00
parent 003709d51f
commit a0c4486808
10 changed files with 291 additions and 26 deletions
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22
lib/IRGen/IRGenModule.cpp
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@@ -88,7 +88,7 @@ IRGenModule::IRGenModule(ASTContext &Context,
WeakReferencePtrTy =
createStructPointerType(*this, "swift.weak", { RefCountedPtrTy });
// A type metadata is the structure pointed to by the canonical
// A type metadata record is the structure pointed to by the canonical
// address point of a type metadata. This is at least one word, and
// potentially more than that, past the start of the actual global
// structure.
@@ -97,7 +97,23 @@ IRGenModule::IRGenModule(ASTContext &Context,
});
TypeMetadataPtrTy = TypeMetadataStructTy->getPointerTo(DefaultAS);
// A tuple type metadata has a couple extra fields.
// A protocol descriptor describes a protocol. It is not type metadata in
// and of itself, but is referenced in the structure of existential type
// metadata records.
ProtocolDescriptorStructTy = createStructType(*this, "swift.protocol", {
Int8PtrTy, // objc isa
Int8PtrTy, // name
Int8PtrTy, // inherited protocols
Int8PtrTy, // required objc instance methods
Int8PtrTy, // required objc class methods
Int8PtrTy, // optional objc instance methods
Int8PtrTy, // optional objc class methods
Int8PtrTy, // objc properties
Int32Ty, // size
Int32Ty // flags
});
// A tuple type metadata record has a couple extra fields.
auto tupleElementTy = createStructType(*this, "swift.tuple_element_type", {
TypeMetadataPtrTy, // Metadata *Type;
SizeTy // size_t Offset;
@@ -109,7 +125,7 @@ IRGenModule::IRGenModule(ASTContext &Context,
llvm::ArrayType::get(tupleElementTy, 0) // Element Elements[];
});
// A full type metadata is basically just an adjustment to the
// A full type metadata record is basically just an adjustment to the
// address point of a type metadata. Resilience may cause
// additional data to be laid out prior to this address point.
FullTypeMetadataStructTy = createStructType(*this, "swift.full_type", {