Merge pull request #58985 from artemcm/57-04182022ExtensionConformanceExtraction

[5.7-04182022][Static Mirror] Gather local type extension conformance infos correctly

Author: artemcm

include/swift/Reflection/TypeRefBuilder.h

@@ -843,6 +843,7 @@ class TypeRefBuilder {
   using ByteReader = std::function<remote::MemoryReader::ReadBytesResult (remote::RemoteAddress, unsigned)>;
   using StringReader = std::function<bool (remote::RemoteAddress, std::string &)>;
   using PointerReader = std::function<llvm::Optional<remote::RemoteAbsolutePointer> (remote::RemoteAddress, unsigned)>;
+  using DynamicSymbolResolver = std::function<llvm::Optional<remote::RemoteAbsolutePointer> (remote::RemoteAddress)>;
   using IntVariableReader = std::function<llvm::Optional<uint64_t> (std::string, unsigned)>;
 
   // These fields are captured from the MetadataReader template passed into the
@@ -856,6 +857,7 @@ class TypeRefBuilder {
   ByteReader OpaqueByteReader;
   StringReader OpaqueStringReader;
   PointerReader OpaquePointerReader;
+  DynamicSymbolResolver OpaqueDynamicSymbolResolver;
   IntVariableReader OpaqueIntVariableReader;
 
 public:
@@ -883,6 +885,9 @@ class TypeRefBuilder {
       OpaquePointerReader([&reader](remote::RemoteAddress address, unsigned size) -> llvm::Optional<remote::RemoteAbsolutePointer> {
         return reader.Reader->readPointer(address, size);
       }),
+      OpaqueDynamicSymbolResolver([&reader](remote::RemoteAddress address) -> llvm::Optional<remote::RemoteAbsolutePointer> {
+        return reader.Reader->getDynamicSymbol(address);
+      }),
       OpaqueIntVariableReader(
         [&reader](std::string symbol, unsigned size) -> llvm::Optional<uint64_t> {
           llvm::Optional<uint64_t> result;
@@ -1007,13 +1012,16 @@ class TypeRefBuilder {
     ByteReader OpaqueByteReader;
     StringReader OpaqueStringReader;
     PointerReader OpaquePointerReader;
+    DynamicSymbolResolver OpaqueDynamicSymbolResolver;
 
     ProtocolConformanceDescriptorReader(ByteReader byteReader,
                                         StringReader stringReader,
-                                        PointerReader pointerReader)
+                                        PointerReader pointerReader,
+                                        DynamicSymbolResolver dynamicSymbolResolver)
         : Error(""), OpaqueByteReader(byteReader),
-          OpaqueStringReader(stringReader), OpaquePointerReader(pointerReader) {
-    }
+          OpaqueStringReader(stringReader),
+          OpaquePointerReader(pointerReader),
+          OpaqueDynamicSymbolResolver(dynamicSymbolResolver) {}
 
     llvm::Optional<std::string>
     getParentContextName(uintptr_t contextDescriptorAddress) {
@@ -1236,17 +1244,16 @@ class TypeRefBuilder {
         return llvm::None;
       }
       auto contextDescriptorOffset =
-          (const uint32_t *)contextDescriptorOffsetBytes.get();
+          (const int32_t *)contextDescriptorOffsetBytes.get();
 
       // Read the type descriptor itself using the address computed above
       auto contextTypeDescriptorAddress = detail::applyRelativeOffset(
           (const char *)contextDescriptorFieldAddress,
-          (int32_t)*contextDescriptorOffset);
+          *contextDescriptorOffset);
 
       // Instead of a type descriptor this may just be a symbol reference, check that first
-      if (auto symbol = OpaquePointerReader(remote::RemoteAddress(contextTypeDescriptorAddress),
-                                            PointerSize)) {
-        if (!symbol->getSymbol().empty()) {
+      if (auto symbol = OpaqueDynamicSymbolResolver(remote::RemoteAddress(contextTypeDescriptorAddress))) {
+        if (!symbol->isResolved()) {
           mangledTypeName = symbol->getSymbol().str();
           Demangle::Context Ctx;
           auto demangledRoot =
@@ -1255,6 +1262,9 @@ class TypeRefBuilder {
           typeName =
               nodeToString(demangledRoot->getChild(0)->getChild(0));
           return std::make_pair(mangledTypeName, typeName);
+        } else if (symbol->getOffset()) {
+          // If symbol is empty and has an offset, this is the resolved remote address
+          contextTypeDescriptorAddress = symbol->getOffset();
         }
       }
 
@@ -1450,7 +1460,7 @@ class TypeRefBuilder {
     std::unordered_map<std::string, std::vector<std::string>> typeConformances;
     ProtocolConformanceDescriptorReader<ObjCInteropKind, PointerSize>
         conformanceReader(OpaqueByteReader, OpaqueStringReader,
-                          OpaquePointerReader);
+                          OpaquePointerReader, OpaqueDynamicSymbolResolver);
     for (const auto &section : ReflectionInfos) {
       auto ConformanceBegin = section.Conformance.startAddress();
       auto ConformanceEnd = section.Conformance.endAddress();

test/Reflection/Inputs/Conformances.swift

@@ -31,3 +31,5 @@ struct foo {
         }
     }
 }
+
+extension foo : MyProto {}

test/Reflection/conformance_descriptors.swift

@@ -19,3 +19,4 @@
 // CHECK-DAG: 16ConformanceCheck2C4V (ConformanceCheck.C4) : ConformanceCheck.P1, ConformanceCheck.P2
 // CHECK-DAG: 16ConformanceCheck2S4V (ConformanceCheck.S4) : ConformanceCheck.P1, ConformanceCheck.P2
 // CHECK-DAG: 16ConformanceCheck2C1C (ConformanceCheck.C1) : ConformanceCheck.ClassBoundP
+// CHECK-DAG: 16ConformanceCheck3fooV (ConformanceCheck.foo) : ConformanceCheck.MyProto