Code completion: add results for __FILE__, __LINE__, __COLUMN__

Swift SVN r6859

lib/IDE/CodeCompletion.cpp

@@ -545,6 +545,17 @@ public:
       addTypeAnnotation(Builder, TypeAnnotation);
   }
 
+  void addKeyword(StringRef Name, StringRef TypeAnnotation) {
+    CodeCompletionResultBuilder Builder(
+        CompletionContext,
+        CodeCompletionResult::ResultKind::Keyword);
+    if (needDot())
+      Builder.addDot();
+    Builder.addTextChunk(Name);
+    if (!TypeAnnotation.empty())
+      Builder.addTypeAnnotation(TypeAnnotation);
+  }
+
   // Implement swift::VisibleDeclConsumer
   void foundDecl(ValueDecl *D) override {
     switch (Kind) {
@@ -679,6 +690,13 @@ public:
     Kind = LookupKind::DeclContext;
     lookupVisibleDecls(*this, CurrDeclContext, Loc);
 
+    // FIXME: The pedantically correct way to find the type is to resolve the
+    // swift.StringLiteralType type.
+    addKeyword("__FILE__", "String");
+    // Same: swift.IntegerLiteralType.
+    addKeyword("__LINE__", "Int");
+    addKeyword("__COLUMN__", "Int");
+
     if (!CompletionContext.haveClangResults())
       if (auto Importer = SwiftContext.getClangModuleLoader())
         static_cast<ClangImporter&>(*Importer).lookupVisibleDecls(*this);