Swift: introduce type mangling

swift/extractor/mangler/SwiftMangler.cpp

@@ -30,3 +30,11 @@ std::string SwiftMangler::mangledName(const swift::Decl& decl) {
   }
   return ret.str();
 }
+
+std::optional<std::string> SwiftMangler::mangleType(const swift::ModuleType& type) {
+  auto key = type.getModule()->getRealName().str().str();
+  if (type.getModule()->isNonSwiftModule()) {
+    key += "|clang";
+  }
+  return key;
+}

swift/extractor/mangler/SwiftMangler.h

@@ -1,16 +1,20 @@
 #pragma once
 
-#include <vector>
-#include <unordered_set>
-#include <filesystem>
-
 #include <swift/AST/ASTMangler.h>
+#include <swift/AST/Types.h>
 
 namespace codeql {
 class SwiftMangler {
  public:
   std::string mangledName(const swift::Decl& decl);
 
+  template <typename T>
+  std::optional<std::string> mangleType(const T& type) {
+    return std::nullopt;
+  }
+
+  std::optional<std::string> mangleType(const swift::ModuleType& type);
+
  private:
   swift::Mangle::ASTMangler mangler;
 };

swift/extractor/translators/TypeTranslator.cpp

@@ -242,11 +242,7 @@ codeql::OpenedArchetypeType TypeTranslator::translateOpenedArchetypeType(
 }
 
 codeql::ModuleType TypeTranslator::translateModuleType(const swift::ModuleType& type) {
-  auto key = type.getModule()->getRealName().str().str();
-  if (type.getModule()->isNonSwiftModule()) {
-    key += "|clang";
-  }
-  auto entry = createTypeEntry(type, key);
+  auto entry = createTypeEntry(type);
   entry.module = dispatcher.fetchLabel(type.getModule());
   return entry;
 }

swift/extractor/translators/TypeTranslator.h

@@ -2,6 +2,7 @@
 
 #include "swift/extractor/translators/TranslatorBase.h"
 #include "swift/extractor/trap/generated/type/TrapClasses.h"
+#include "swift/extractor/mangler/SwiftMangler.h"
 
 namespace codeql {
 class TypeTranslator : public TypeTranslatorBase<TypeTranslator> {
@@ -87,12 +88,23 @@ class TypeTranslator : public TypeTranslatorBase<TypeTranslator> {
   void fillBoundGenericType(const swift::BoundGenericType& type, codeql::BoundGenericType& entry);
   void fillAnyGenericType(const swift::AnyGenericType& type, codeql::AnyGenericType& entry);
 
-  template <typename T, typename... Args>
-  auto createTypeEntry(const T& type, const Args&... args) {
-    auto entry = dispatcher.createEntry(type, args...);
+  template <typename T>
+  auto createMangledTypeEntry(const T& type) {
+    auto mangledName = mangler.mangleType(type);
+    if (mangledName) {
+      return dispatcher.createEntry(type, mangledName.value());
+    }
+    return dispatcher.createEntry(type);
+  }
+
+  template <typename T>
+  auto createTypeEntry(const T& type) {
+    auto entry = createMangledTypeEntry(type);
     fillType(type, entry);
     return entry;
   }
+
+  SwiftMangler mangler;
 };
 
 }  // namespace codeql