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Teach the generic specializer how to create SILWitnessTable declarations if a specialized conformance does not have a witness table.

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This also teaches IRGen not to emit WitnessTable declarations. This
causes them to be left as unknown symbols in the resulting executable.

Swift SVN r15361
This commit is contained in:
Michael Gottesman
2014-03-22 05:05:47 +00:00
parent 084d468236
commit 3ad6f33202
9 changed files with 115 additions and 0 deletions
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33
lib/SIL/SILModule.cpp
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@@ -93,6 +93,38 @@ SILModule::~SILModule() {
delete (SILTypeListUniquingType*)TypeListUniquing;
}
SILWitnessTable *
SILModule::createWitnessTableDeclaration(ProtocolConformance *C) {
// Walk down to the base NormalProtocolConformance.
ProtocolConformance *ParentC = C;
ArrayRef<Substitution> Subs;
while (!isa<NormalProtocolConformance>(ParentC)) {
switch (ParentC->getKind()) {
case ProtocolConformanceKind::Normal:
llvm_unreachable("should have exited the loop?!");
case ProtocolConformanceKind::Inherited:
ParentC = cast<InheritedProtocolConformance>(ParentC)
->getInheritedConformance();
break;
case ProtocolConformanceKind::Specialized: {
auto SC = cast<SpecializedProtocolConformance>(ParentC);
ParentC = SC->getGenericConformance();
assert(Subs.empty() && "multiple conformance specializations?!");
Subs = SC->getGenericSubstitutions();
break;
}
}
}
NormalProtocolConformance *NormalC
= cast<NormalProtocolConformance>(ParentC);
SILWitnessTable *WT = SILWitnessTable::create(*this,
SILLinkage::PublicExternal,
NormalC);
WitnessTableLookupCache[NormalC] = WT;
return WT;
}
std::pair<SILWitnessTable *, ArrayRef<Substitution>>
SILModule::lookUpWitnessTable(const ProtocolConformance *C) {
// Walk down to the base NormalProtocolConformance.
@@ -143,6 +175,7 @@ SILModule::lookUpWitnessTable(const ProtocolConformance *C) {
return {nullptr, Subs};
}
SILFunction *SILModule::getOrCreateSharedFunction(SILLocation loc,
StringRef name,
CanSILFunctionType type,