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SIL: Introduce lowered SILLayouts.

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This gives us a concept we can eventually use to cache the lowered physical layout of fragile structs and classes, and more immediately, concretize the layout of closure boxes in a way that lets us represent the capture of generic environments and multiple captured values without compromising the "nominal" nature of box layouts. To start exercising the basic implementation, change the representation of SILBoxType to be in terms of a SILLayout, though avoid any immediate functionality change by preserving the single-boxed-type interface for now.
This commit is contained in:
Joe Groff
2016-10-19 14:01:18 -07:00
parent 22f5dfa50a
commit cabaa0a51a
11 changed files with 414 additions and 26 deletions
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38
lib/AST/ASTContext.cpp
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@@ -228,6 +228,9 @@ struct ASTContext::Implementation {
/// an Objective-C class.
llvm::DenseMap<std::pair<const clang::ObjCInterfaceDecl *, char>,
std::unique_ptr<InheritedNameSet>> AllPropertiesObjC;
/// The single-parameter generic signature with no constraints, <T>.
CanGenericSignature SingleGenericParameterSignature;
/// \brief Structure that captures data that is segregated into different
/// arenas.
@@ -354,6 +357,8 @@ struct ASTContext::Implementation {
}
llvm_unreachable("bad AllocationArena");
}
llvm::FoldingSet<SILLayout> *SILLayouts = nullptr;
};
ASTContext::Implementation::Implementation()
@@ -3150,20 +3155,6 @@ CanSILBlockStorageType SILBlockStorageType::get(CanType captureType) {
return CanSILBlockStorageType(storageTy);
}
CanSILBoxType SILBoxType::get(CanType boxType) {
ASTContext &ctx = boxType->getASTContext();
auto found = ctx.Impl.SILBoxTypes.find(boxType);
if (found != ctx.Impl.SILBoxTypes.end())
return CanSILBoxType(found->second);
void *mem = ctx.Allocate(sizeof(SILBlockStorageType),
alignof(SILBlockStorageType));
auto storageTy = new (mem) SILBoxType(boxType);
ctx.Impl.SILBoxTypes.insert({boxType, storageTy});
return CanSILBoxType(storageTy);
}
CanSILFunctionType SILFunctionType::get(GenericSignature *genericSig,
ExtInfo ext, ParameterConvention callee,
ArrayRef<SILParameterInfo> params,
@@ -4033,3 +4024,22 @@ const InheritedNameSet *ASTContext::getAllPropertyNames(
return known->second.get();
}
CanGenericSignature ASTContext::getSingleGenericParameterSignature() const {
if (auto theSig = Impl.SingleGenericParameterSignature)
return theSig;
auto param = GenericTypeParamType::get(0, 0, *this);
auto sig = GenericSignature::get(param, {});
auto canonicalSig = CanGenericSignature(sig);
Impl.SingleGenericParameterSignature = canonicalSig;
return canonicalSig;
}
llvm::FoldingSet<SILLayout> *&ASTContext::getSILLayouts() {
return Impl.SILLayouts;
}
llvm::DenseMap<CanType, SILBoxType *> &ASTContext::getSILBoxTypes() {
return Impl.SILBoxTypes;
}