Add c++tools

Part of our module implementation adds a sample mapper server, the
guts of which are used by the default in-process mapping of cc1plus.
Rather than add another executable to gcc/cp/, this creates a new
c++tools directory where this and any other c++ tools might live.
The toplevel changes are a subsequent commit, because ... git.

c++tools/ChangeLog:

	* Makefile.in: New.
	* config.h.in: New.
	* configure: New.
	* configure.ac: New.
	* resolver.cc: New.
	* resolver.h: New.
	* server.cc: New.

1 files changed, 105 insertions, 0 deletions

diff --git a/c++tools/resolver.h b/c++tools/resolver.h
new file mode 100644
index 0000000..1933912
--- /dev/null
+++ b/c++tools/resolver.h
@@ -0,0 +1,105 @@
+/* C++ modules.  Experimental!	-*- c++ -*-
+   Copyright (C) 2017-2020 Free Software Foundation, Inc.
+   Written by Nathan Sidwell <nathan@acm.org> while at FaceBook
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GXX_RESOLVER_H
+#define GXX_RESOLVER_H 1
+
+// Mapper interface for client and server bits
+#include "cody.hh"
+// C++
+#include <string>
+#include <map>
+
+// This is a GCC class, so GCC coding conventions on new bits.  
+class module_resolver : public Cody::Resolver
+{
+public:
+  using parent = Cody::Resolver;
+  using module_map = std::map<std::string, std::string>;
+
+private:
+  std::string repo;
+  std::string ident;
+  module_map map;
+  int fd_repo = -1;
+  bool default_map = true;
+  bool default_translate = true;
+
+public:
+  module_resolver (bool map = true, bool xlate = false);
+  virtual ~module_resolver () override;
+
+public:
+  void set_default_map (bool d)
+  {
+    default_map = d;
+  }
+  void set_default_translate (bool d)
+  {
+    default_translate = d;
+  }
+  void set_ident (char const *i)
+  {
+    ident = i;
+  }
+  bool set_repo (std::string &&repo, bool force = false);
+  bool add_mapping (std::string &&module, std::string &&file,
+		    bool force = false);
+
+  // Return +ve line number of error, or -ve errno
+  int read_tuple_file (int fd, char const *prefix, bool force = false);
+  int read_tuple_file (int fd, std::string const &prefix,
+			    bool force = false)
+  {
+    return read_tuple_file (fd, prefix.empty () ? nullptr : prefix.c_str (),
+			    force);
+  }
+
+public:
+  // Virtual overriders, names are controlled by Cody::Resolver
+  using parent::ConnectRequest;
+  virtual module_resolver *ConnectRequest (Cody::Server *, unsigned version,
+					   std::string &agent,
+					   std::string &ident)
+    override;
+  using parent::ModuleRepoRequest;
+  virtual int ModuleRepoRequest (Cody::Server *) override;
+  using parent::ModuleExportRequest;
+  virtual int ModuleExportRequest (Cody::Server *s, Cody::Flags,
+				   std::string &module)
+    override;
+  using parent::ModuleImportRequest;
+  virtual int ModuleImportRequest (Cody::Server *s, Cody::Flags,
+				   std::string &module)
+    override;
+  using parent::IncludeTranslateRequest;
+  virtual int IncludeTranslateRequest (Cody::Server *s, Cody::Flags,
+				       std::string &include)
+    override;
+
+private:
+  using parent::GetCMISuffix;
+  virtual char const *GetCMISuffix () override;
+
+private:
+  int cmi_response (Cody::Server *s, std::string &module);
+};
+
+#endif