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Fix tricky case of functor signature subsumption
author Adam Chlipala <adam@chlipala.net>
date Fri, 27 Nov 2015 15:28:12 -0500
parents 22117edf8fd3
children
rev   line source
adam@2010 1 (* Copyright (c) 2008-2011, 2014, Adam Chlipala
adamc@2 2 * All rights reserved.
adamc@2 3 *
adamc@2 4 * Redistribution and use in source and binary forms, with or without
adamc@2 5 * modification, are permitted provided that the following conditions are met:
adamc@2 6 *
adamc@2 7 * - Redistributions of source code must retain the above copyright notice,
adamc@2 8 * this list of conditions and the following disclaimer.
adamc@2 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@2 10 * this list of conditions and the following disclaimer in the documentation
adamc@2 11 * and/or other materials provided with the distribution.
adamc@2 12 * - The names of contributors may not be used to endorse or promote products
adamc@2 13 * derived from this software without specific prior written permission.
adamc@2 14 *
adamc@2 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@2 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@2 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@2 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@2 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@2 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@2 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@2 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@2 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@2 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@2 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@2 26 *)
adamc@2 27
adamc@2 28 structure Elab = struct
adamc@2 29
adamc@2 30 type 'a located = 'a ErrorMsg.located
adamc@2 31
adamc@2 32 datatype kind' =
adamc@2 33 KType
adamc@2 34 | KArrow of kind * kind
adamc@2 35 | KName
adamc@2 36 | KRecord of kind
adamc@82 37 | KUnit
adamc@207 38 | KTuple of kind list
adamc@2 39
adamc@2 40 | KError
adam@1639 41 | KUnif of ErrorMsg.span * string * kunif ref
adam@1639 42 | KTupleUnif of ErrorMsg.span * (int * kind) list * kunif ref
adamc@2 43
adamc@623 44 | KRel of int
adamc@623 45 | KFun of string * kind
adamc@623 46
adam@1639 47 and kunif =
adam@1639 48 KUnknown of kind -> bool (* Is the kind a valid unification? *)
adam@1639 49 | KKnown of kind
adam@1639 50
adamc@2 51 withtype kind = kind' located
adamc@2 52
adamc@2 53 datatype explicitness =
adamc@2 54 Explicit
adamc@2 55 | Implicit
adamc@2 56
adamc@2 57 datatype con' =
adamc@2 58 TFun of con * con
adamc@2 59 | TCFun of explicitness * string * kind * con
adamc@2 60 | TRecord of con
adamc@628 61 | TDisjoint of con * con * con
adamc@2 62
adamc@2 63 | CRel of int
adamc@2 64 | CNamed of int
adamc@34 65 | CModProj of int * string list * string
adamc@2 66 | CApp of con * con
adamc@8 67 | CAbs of string * kind * con
adamc@2 68
adamc@623 69 | CKAbs of string * con
adamc@623 70 | CKApp of con * kind
adamc@623 71 | TKFun of string * con
adamc@623 72
adamc@2 73 | CName of string
adamc@2 74
adamc@2 75 | CRecord of kind * (con * con) list
adamc@2 76 | CConcat of con * con
adamc@621 77 | CMap of kind * kind
adamc@2 78
adamc@82 79 | CUnit
adamc@82 80
adamc@207 81 | CTuple of con list
adamc@207 82 | CProj of con * int
adamc@207 83
adamc@2 84 | CError
adam@1639 85 | CUnif of int * ErrorMsg.span * kind * string * cunif ref
adam@1639 86
adam@1639 87 and cunif =
adam@1639 88 Unknown of con -> bool (* Is the constructor a valid unification? *)
adam@1639 89 | Known of con
adamc@2 90
adamc@2 91 withtype con = con' located
adamc@2 92
adamc@731 93 datatype datatype_kind = datatype DatatypeKind.datatype_kind
adamc@188 94
adamc@171 95 datatype patCon =
adamc@171 96 PConVar of int
adamc@171 97 | PConProj of int * string list * string
adamc@171 98
adamc@171 99 datatype pat' =
adamc@171 100 PWild
adamc@182 101 | PVar of string * con
adamc@173 102 | PPrim of Prim.t
adamc@191 103 | PCon of datatype_kind * patCon * con list * pat option
adamc@182 104 | PRecord of (string * pat * con) list
adamc@171 105
adamc@171 106 withtype pat = pat' located
adamc@171 107
adamc@9 108 datatype exp' =
adamc@14 109 EPrim of Prim.t
adamc@14 110 | ERel of int
adamc@9 111 | ENamed of int
adamc@34 112 | EModProj of int * string list * string
adamc@9 113 | EApp of exp * exp
adamc@26 114 | EAbs of string * con * con * exp
adamc@9 115 | ECApp of exp * con
adamc@9 116 | ECAbs of explicitness * string * kind * exp
adamc@9 117
adamc@623 118 | EKAbs of string * exp
adamc@623 119 | EKApp of exp * kind
adamc@623 120
adamc@29 121 | ERecord of (con * exp * con) list
adamc@12 122 | EField of exp * con * { field : con, rest : con }
adamc@445 123 | EConcat of exp * con * exp * con
adamc@149 124 | ECut of exp * con * { field : con, rest : con }
adamc@493 125 | ECutMulti of exp * con * { rest : con }
adamc@12 126
adamc@182 127 | ECase of exp * (pat * exp) list * { disc : con, result : con }
adamc@171 128
adamc@9 129 | EError
adamc@228 130 | EUnif of exp option ref
adamc@9 131
adamc@825 132 | ELet of edecl list * exp * con
adamc@447 133
adamc@447 134 and edecl' =
adamc@825 135 EDVal of pat * con * exp
adamc@447 136 | EDValRec of (string * con * exp) list
adamc@447 137
adamc@9 138 withtype exp = exp' located
adamc@447 139 and edecl = edecl' located
adamc@9 140
adam@2190 141 (* We have to be careful about crawling automatically generated signatures recursively,
adam@2190 142 * importing all type-class instances that we find.
adam@2190 143 * The reason is that selfification will add signatures of anonymous structures,
adam@2190 144 * and it's counterintuitive for instances to escape anonymous structures! *)
adam@2190 145 datatype import_mode = Import | Skip
adam@2190 146
adamc@31 147 datatype sgn_item' =
adamc@31 148 SgiConAbs of string * int * kind
adamc@31 149 | SgiCon of string * int * kind * con
adamc@805 150 | SgiDatatype of (string * int * string list * (string * int * con option) list) list
adamc@191 151 | SgiDatatypeImp of string * int * int * string list * string * string list * (string * int * con option) list
adamc@31 152 | SgiVal of string * int * con
adam@2190 153 | SgiStr of import_mode * string * int * sgn
adamc@59 154 | SgiSgn of string * int * sgn
adamc@88 155 | SgiConstraint of con * con
adamc@563 156 | SgiClassAbs of string * int * kind
adamc@563 157 | SgiClass of string * int * kind * con
adamc@31 158
adamc@31 159 and sgn' =
adamc@31 160 SgnConst of sgn_item list
adamc@31 161 | SgnVar of int
adamc@41 162 | SgnFun of string * int * sgn * sgn
adam@1864 163 | SgnWhere of sgn * string list * string * con
adamc@59 164 | SgnProj of int * string list * string
adamc@31 165 | SgnError
adamc@31 166
adamc@31 167 withtype sgn_item = sgn_item' located
adamc@31 168 and sgn = sgn' located
adamc@31 169
adamc@2 170 datatype decl' =
adamc@5 171 DCon of string * int * kind * con
adamc@805 172 | DDatatype of (string * int * string list * (string * int * con option) list) list
adamc@191 173 | DDatatypeImp of string * int * int * string list * string * string list * (string * int * con option) list
adamc@9 174 | DVal of string * int * con * exp
adamc@123 175 | DValRec of (string * int * con * exp) list
adamc@31 176 | DSgn of string * int * sgn
adamc@31 177 | DStr of string * int * sgn * str
adamc@48 178 | DFfiStr of string * int * sgn
adamc@88 179 | DConstraint of con * con
adamc@109 180 | DExport of int * sgn * str
adamc@707 181 | DTable of int * string * int * con * exp * con * exp * con
adamc@338 182 | DSequence of int * string * int
adamc@754 183 | DView of int * string * int * exp * con
adamc@271 184 | DDatabase of string
adamc@459 185 | DCookie of int * string * int * con
adamc@720 186 | DStyle of int * string * int
adamc@1075 187 | DTask of exp * exp
adamc@1199 188 | DPolicy of exp
adam@1294 189 | DOnError of int * string list * string
adam@2010 190 | DFfi of string * int * Source.ffi_mode list * con
adamc@31 191
adamc@31 192 and str' =
adamc@31 193 StrConst of decl list
adamc@31 194 | StrVar of int
adamc@34 195 | StrProj of str * string
adamc@41 196 | StrFun of string * int * sgn * sgn * str
adamc@44 197 | StrApp of str * str
adamc@31 198 | StrError
adamc@2 199
adamc@2 200 withtype decl = decl' located
adamc@31 201 and str = str' located
adamc@31 202
adamc@2 203 type file = decl list
adamc@2 204
adamc@2 205 end