SIL: make SubstitutionMap CustomStringConvertible

Author: eeckstein

SwiftCompilerSources/Sources/AST/SubstitutionMap.swift

@@ -18,7 +18,7 @@ import ASTBridging
 ///
 /// Substitution maps are primarily used when performing substitutions into any entity that
 /// can reference type parameters and conformances.
-public struct SubstitutionMap {
+public struct SubstitutionMap: CustomStringConvertible {
   public let bridged: BridgedSubstitutionMap
 
   public init(bridged: BridgedSubstitutionMap) {
@@ -29,6 +29,10 @@ public struct SubstitutionMap {
     self.bridged = BridgedSubstitutionMap()
   }
 
+  public var description: String {
+    return String(taking: bridged.getDebugDescription())
+  }
+
   public var isEmpty: Bool { bridged.isEmpty() }
 
   public var hasAnySubstitutableParams: Bool { bridged.hasAnySubstitutableParams() }

include/swift/AST/ASTBridging.h

@@ -2070,6 +2070,7 @@ struct BridgedSubstitutionMap {
   BRIDGED_INLINE BridgedSubstitutionMap(swift::SubstitutionMap map);
   BRIDGED_INLINE swift::SubstitutionMap unbridged() const;
   BRIDGED_INLINE BridgedSubstitutionMap();
+  BridgedOwnedString getDebugDescription() const;
   BRIDGED_INLINE bool isEmpty() const;
   BRIDGED_INLINE bool hasAnySubstitutableParams() const;
   BRIDGED_INLINE SwiftInt getNumConformances() const;

lib/AST/Bridging/MiscBridging.cpp

@@ -51,12 +51,28 @@ void BridgedTypeRepr_dump(void *type) { static_cast<TypeRepr *>(type)->dump(); }
 
 #pragma clang diagnostic pop
 
+//===----------------------------------------------------------------------===//
+// MARK: Conformance
+//===----------------------------------------------------------------------===//
+
 BridgedOwnedString BridgedConformance::getDebugDescription() const {
   std::string str;
   llvm::raw_string_ostream os(str);
   unbridged().print(os);
   return str;
 }
 
+//===----------------------------------------------------------------------===//
+// MARK: SubstitutionMap
+//===----------------------------------------------------------------------===//
+
 static_assert(sizeof(BridgedSubstitutionMap) >= sizeof(swift::SubstitutionMap),
               "BridgedSubstitutionMap has wrong size");
+
+BridgedOwnedString BridgedSubstitutionMap::getDebugDescription() const {
+  std::string str;
+  llvm::raw_string_ostream os(str);
+  unbridged().dump(os);
+  return str;
+}
+