adam@1732: (* Copyright (c) 2012, Adam Chlipala
adam@1732:  * All rights reserved.
adam@1732:  *
adam@1732:  * Redistribution and use in source and binary forms, with or without
adam@1732:  * modification, are permitted provided that the following conditions are met:
adam@1732:  *
adam@1732:  * - Redistributions of source code must retain the above copyright notice,
adam@1732:  *   this list of conditions and the following disclaimer.
adam@1732:  * - Redistributions in binary form must reproduce the above copyright notice,
adam@1732:  *   this list of conditions and the following disclaimer in the documentation
adam@1732:  *   and/or other materials provided with the distribution.
adam@1732:  * - The names of contributors may not be used to endorse or promote products
adam@1732:  *   derived from this software without specific prior written permission.
adam@1732:  *
adam@1732:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adam@1732:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adam@1732:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adam@1732:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adam@1732:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adam@1732:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adam@1732:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adam@1732:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adam@1732:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adam@1732:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adam@1732:  * POSSIBILITY OF SUCH DAMAGE.
adam@1732:  *)
adam@1732: 
adam@1732: (* Cache of module code, with dependency information *)
adam@1732: 
adam@1732: signature MOD_DB = sig
adam@1732:     val reset : unit -> unit
adam@1732: 
adam@1732:     val insert : Elab.decl * Time.time -> unit
adam@1732:     (* Here's a declaration, including the modification timestamp of the file it came from.
adam@1732:      * We might invalidate other declarations that depend on this one, if the timestamp has changed. *)
adam@1732: 
adam@1732:     val lookup : Source.decl -> Elab.decl option
adam@1737: 
adam@1737:     (* Allow undoing to snapshots after failed compilations. *)
adam@1737:     val snapshot : unit -> unit
adam@1737:     val revert : unit -> unit
adam@1732: end