[unittests] Add a fixture for Sema unit tests

unittests/CMakeLists.txt

@@ -12,6 +12,7 @@ if(SWIFT_INCLUDE_TOOLS)
   add_subdirectory(Localization)
   add_subdirectory(IDE)
   add_subdirectory(Parse)
+  add_subdirectory(Sema)
   add_subdirectory(SwiftDemangle)
   add_subdirectory(Syntax)
   if(SWIFT_BUILD_SYNTAXPARSERLIB)

unittests/Sema/CMakeLists.txt

@@ -0,0 +1,7 @@
+
+add_swift_unittest(swiftSemaTests
+  SemaFixture.cpp)
+
+target_link_libraries(swiftSemaTests
+  PRIVATE
+    swiftSema)

unittests/Sema/SemaFixture.cpp

@@ -0,0 +1,36 @@
+//===--- SemaFixture.cpp - Helper for setting up Sema context --------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#include "SemaFixture.h"
+#include "swift/AST/Module.h"
+#include "swift/AST/ParseRequests.h"
+#include "swift/Strings.h"
+#include "swift/Subsystems.h"
+
+using namespace swift;
+using namespace swift::unittest;
+
+SemaTest::SemaTest()
+    : Context(*ASTContext::get(LangOpts, TypeCheckerOpts, SearchPathOpts,
+                               ClangImporterOpts, SourceMgr, Diags)) {
+  registerParseRequestFunctions(Context.evaluator);
+  registerTypeCheckerRequestFunctions(Context.evaluator);
+  auto stdlibID = Context.getIdentifier(STDLIB_NAME);
+  auto *module = ModuleDecl::create(stdlibID, Context);
+  Context.addLoadedModule(module);
+
+  FileForLookups = new (Context) SourceFile(*module, SourceFileKind::Library,
+                                            /*buffer*/ None);
+  module->addFile(*FileForLookups);
+
+  DC = module;
+}

unittests/Sema/SemaFixture.h

@@ -0,0 +1,51 @@
+//===--- SemaFixture.h - Helper for setting up Sema context -----*- C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#include "swift/AST/ASTContext.h"
+#include "swift/AST/DiagnosticEngine.h"
+#include "swift/AST/Module.h"
+#include "swift/AST/SourceFile.h"
+#include "swift/Basic/LangOptions.h"
+#include "swift/Basic/SourceManager.h"
+#include "llvm/Support/Host.h"
+#include "gtest/gtest.h"
+
+namespace swift {
+namespace unittest {
+
+class SemaTestBase : public ::testing::Test {
+public:
+  LangOptions LangOpts;
+  TypeCheckerOptions TypeCheckerOpts;
+  SearchPathOptions SearchPathOpts;
+  ClangImporterOptions ClangImporterOpts;
+  SourceManager SourceMgr;
+  DiagnosticEngine Diags;
+
+  SemaTestBase() : Diags(SourceMgr) {
+    LangOpts.Target = llvm::Triple(llvm::sys::getProcessTriple());
+  }
+};
+
+/// Owns an ASTContext and the associated types.
+class SemaTest : public SemaTestBase {
+  SourceFile *FileForLookups;
+
+public:
+  ASTContext &Context;
+  DeclContext *DC;
+
+  SemaTest();
+};
+
+} // end namespace unittest
+} // end namespace swift