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diff --git a/clang-tools-extra/clangd/CodeComplete.h b/clang-tools-extra/clangd/CodeComplete.h
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+//===--- CodeComplete.h -----------------------------------------*- C++-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===---------------------------------------------------------------------===//
+//
+// Code completion provides suggestions for what the user might type next.
+// After "std::string S; S." we might suggest members of std::string.
+// Signature help describes the parameters of a function as you type them.
+//
+//===---------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_CODECOMPLETE_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_CODECOMPLETE_H
+
+#include "Logger.h"
+#include "Path.h"
+#include "Protocol.h"
+#include "clang/Frontend/PrecompiledPreamble.h"
+#include "clang/Sema/CodeCompleteOptions.h"
+#include "clang/Tooling/CompilationDatabase.h"
+
+namespace clang {
+class PCHContainerOperations;
+namespace clangd {
+
+struct CodeCompleteOptions {
+  /// Returns options that can be passed to clang's completion engine.
+  clang::CodeCompleteOptions getClangCompleteOpts() const;
+
+  /// When true, completion items will contain expandable code snippets in
+  /// completion (e.g.  `return ${1:expression}` or `foo(${1:int a}, ${2:int
+  /// b})).
+  bool EnableSnippets = false;
+
+  /// Add code patterns to completion results.
+  /// If EnableSnippets is false, this options is ignored and code patterns will
+  /// always be omitted.
+  bool IncludeCodePatterns = true;
+
+  /// Add macros to code completion results.
+  bool IncludeMacros = true;
+
+  /// Add globals to code completion results.
+  bool IncludeGlobals = true;
+
+  /// Add brief comments to completion items, if available.
+  /// FIXME(ibiryukov): it looks like turning this option on significantly slows
+  /// down completion, investigate if it can be made faster.
+  bool IncludeBriefComments = true;
+
+  /// Include results that are not legal completions in the current context.
+  /// For example, private members are usually inaccessible.
+  bool IncludeIneligibleResults = false;
+
+  /// Limit the number of results returned (0 means no limit).
+  /// If more results are available, we set CompletionList.isIncomplete.
+  size_t Limit = 0;
+};
+
+/// Get code completions at a specified \p Pos in \p FileName.
+CompletionList codeComplete(PathRef FileName,
+                            const tooling::CompileCommand &Command,
+                            PrecompiledPreamble const *Preamble,
+                            StringRef Contents, Position Pos,
+                            IntrusiveRefCntPtr<vfs::FileSystem> VFS,
+                            std::shared_ptr<PCHContainerOperations> PCHs,
+                            CodeCompleteOptions Opts, Logger &Logger);
+
+/// Get signature help at a specified \p Pos in \p FileName.
+SignatureHelp
+signatureHelp(PathRef FileName, const tooling::CompileCommand &Command,
+              PrecompiledPreamble const *Preamble, StringRef Contents,
+              Position Pos, IntrusiveRefCntPtr<vfs::FileSystem> VFS,
+              std::shared_ptr<PCHContainerOperations> PCHs, Logger &Logger);
+
+} // namespace clangd
+} // namespace clang
+
+#endif