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Include access functions for the metadata and witness tables

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of associated types in protocol witness tables.

We use the global access functions when the result isn't
dependent, and a simple accessor when the result can be cheaply
recovered from the conforming metadata.  Otherwise, we add a
cache slot to a private section of the witness table, forcing
an instantiation per conformance.  Like generic type metadata,
concrete instantiations of generic conformances are memoized.

There's a fair amount of code in this patch that can't be
dynamically tested at the moment because of the widespread
reliance on recursive expansion of archetypes / dependent
types.  That's something we're now theoretically in a position
to change, and as we do so, we'll test more of this code.
This commit is contained in:
John McCall
2015-12-23 00:24:00 -08:00
parent 0d037ad917
commit b1e3120a28
30 changed files with 1605 additions and 250 deletions
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29
lib/IRGen/Linking.cpp
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@@ -183,6 +183,18 @@ void LinkEntity::mangle(raw_ostream &buffer) const {
mangler.mangleProtocolConformance(getProtocolConformance());
return;
// global ::= 'WG' protocol-conformance
case Kind::GenericProtocolWitnessTableCache:
buffer << "_TWG";
mangler.mangleProtocolConformance(getProtocolConformance());
return;
// global ::= 'WI' protocol-conformance
case Kind::GenericProtocolWitnessTableInstantiationFunction:
buffer << "_TWI";
mangler.mangleProtocolConformance(getProtocolConformance());
return;
// global ::= 'Wa' protocol-conformance
case Kind::ProtocolWitnessTableAccessFunction:
mangler.manglePrefix("_TWa");
@@ -203,16 +215,19 @@ void LinkEntity::mangle(raw_ostream &buffer) const {
mangler.mangleProtocolConformance(getProtocolConformance());
return;
// global ::= 'WD' protocol-conformance
case Kind::DependentProtocolWitnessTableGenerator:
mangler.manglePrefix("_TWD");
// global ::= 'Wt' protocol-conformance identifier
case Kind::AssociatedTypeMetadataAccessFunction:
mangler.manglePrefix("_TWt");
mangler.mangleProtocolConformance(getProtocolConformance());
mangler.mangleIdentifier(getAssociatedType()->getNameStr());
return;
// global ::= 'Wd' protocol-conformance
case Kind::DependentProtocolWitnessTableTemplate:
mangler.manglePrefix("_TWd");
// global ::= 'WT' protocol-conformance identifier nominal-type
case Kind::AssociatedTypeWitnessTableAccessFunction:
mangler.manglePrefix("_TWT");
mangler.mangleProtocolConformance(getProtocolConformance());
mangler.mangleIdentifier(getAssociatedType()->getNameStr());
mangler.mangleProtocolDecl(getAssociatedProtocol());
return;
// For all the following, this rule was imposed above: