Merge pull request #63412 from aschwaighofer/conditionalize_relative_pwt_entry_points

runtime: conditionally generate relative protocol witness tables entry points

Author: aschwaighofer

include/swift/Runtime/Metadata.h

@@ -354,11 +354,13 @@ swift_getWitnessTable(const ProtocolConformanceDescriptor *conformance,
                       const Metadata *type,
                       const void * const *instantiationArgs);
 
+#if SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES
 SWIFT_RUNTIME_EXPORT
 const RelativeWitnessTable *
 swift_getWitnessTableRelative(const ProtocolConformanceDescriptor *conformance,
                       const Metadata *type,
                       const void * const *instantiationArgs);
+#endif
 
 /// Retrieve an associated type witness from the given witness table.
 ///
@@ -375,14 +377,15 @@ MetadataResponse swift_getAssociatedTypeWitness(
                                           const Metadata *conformingType,
                                           const ProtocolRequirement *reqBase,
                                           const ProtocolRequirement *assocType);
+#if SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES
 SWIFT_RUNTIME_EXPORT SWIFT_CC(swift)
 MetadataResponse swift_getAssociatedTypeWitnessRelative(
                                           MetadataRequest request,
                                           RelativeWitnessTable *wtable,
                                           const Metadata *conformingType,
                                           const ProtocolRequirement *reqBase,
                                           const ProtocolRequirement *assocType);
-
+#endif
 /// Retrieve an associated conformance witness table from the given witness
 /// table.
 ///
@@ -401,13 +404,15 @@ const WitnessTable *swift_getAssociatedConformanceWitness(
                                   const ProtocolRequirement *reqBase,
                                   const ProtocolRequirement *assocConformance);
 
+#if SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES
 SWIFT_RUNTIME_EXPORT SWIFT_CC(swift)
 const RelativeWitnessTable *swift_getAssociatedConformanceWitnessRelative(
                                   RelativeWitnessTable *wtable,
                                   const Metadata *conformingType,
                                   const Metadata *assocType,
                                   const ProtocolRequirement *reqBase,
                                   const ProtocolRequirement *assocConformance);
+#endif
 
 /// Determine whether two protocol conformance descriptors describe the same
 /// conformance of a type to a protocol.

stdlib/public/runtime/Metadata.cpp

@@ -5368,6 +5368,7 @@ swift::swift_getWitnessTable(const ProtocolConformanceDescriptor *conformance,
   return uniqueForeignWitnessTableRef(result.second);
 }
 
+#if SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES
 namespace {
 
 /// A cache-entry type suitable for use with LockingConcurrentMap.
@@ -5644,6 +5645,7 @@ swift::swift_getWitnessTableRelative(const ProtocolConformanceDescriptor *confor
   return reinterpret_cast<RelativeWitnessTable*>(((uintptr_t)table) |
                                                  (uintptr_t)0x1);
 }
+#endif
 
 /// Find the name of the associated type with the given descriptor.
 static StringRef findAssociatedTypeName(const ProtocolDescriptor *protocol,
@@ -5858,6 +5860,7 @@ RelativeWitnessTable *swift::lookThroughOptionalConditionalWitnessTable(
   return table;
 }
 
+#if SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES
 SWIFT_CC(swift)
 static MetadataResponse
 swift_getAssociatedTypeWitnessRelativeSlowImpl(
@@ -5954,6 +5957,7 @@ swift::swift_getAssociatedTypeWitnessRelative(MetadataRequest request,
                                                     conformingType, reqBase,
                                                     assocType);
 }
+#endif
 
 using AssociatedConformanceWitness = std::atomic<void *>;
 
@@ -6098,6 +6102,7 @@ const WitnessTable *swift::swift_getAssociatedConformanceWitness(
                                                    assocConformance);
 }
 
+#if SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES
 SWIFT_CC(swift)
 static const RelativeWitnessTable *swift_getAssociatedConformanceWitnessRelativeSlowImpl(
                                   RelativeWitnessTable *wtable,
@@ -6186,6 +6191,7 @@ const RelativeWitnessTable *swift::swift_getAssociatedConformanceWitnessRelative
                                                    assocType, reqBase,
                                                    assocConformance);
 }
+#endif
 
 bool swift::swift_compareProtocolConformanceDescriptors(
     const ProtocolConformanceDescriptor *lhs,