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annotate src/toy_cache.sml @ 2296:5104e480b3e3

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Fix a few C memory bugs
author Adam Chlipala <adam@chlipala.net>
date Thu, 19 Nov 2015 10:31:47 -0500
parents 0bdfec16a01d
children
rev   line source
ziv@2233 1 structure ToyCache : sig
ziv@2233 2 val cache : Cache.cache
ziv@2233 3 end = struct
ziv@2233 4
ziv@2231 5
ziv@2231 6 (* Mono *)
ziv@2231 7
ziv@2231 8 open Mono
ziv@2231 9
ziv@2231 10 val dummyLoc = ErrorMsg.dummySpan
ziv@2231 11 val stringTyp = (TFfi ("Basis", "string"), dummyLoc)
ziv@2231 12 val optionStringTyp = (TOption stringTyp, dummyLoc)
ziv@2231 13 fun withTyp typ = map (fn exp => (exp, typ))
ziv@2231 14
ziv@2231 15 fun ffiAppCache' (func, index, argTyps) =
ziv@2265 16 EFfiApp ("Sqlcache", func ^ Int.toString index, argTyps)
ziv@2231 17
ziv@2231 18 fun check (index, keys) =
ziv@2231 19 ffiAppCache' ("check", index, withTyp stringTyp keys)
ziv@2231 20
ziv@2231 21 fun store (index, keys, value) =
ziv@2231 22 ffiAppCache' ("store", index, (value, stringTyp) :: withTyp stringTyp keys)
ziv@2231 23
ziv@2231 24 fun flush (index, keys) =
ziv@2231 25 ffiAppCache' ("flush", index, withTyp optionStringTyp keys)
ziv@2231 26
ziv@2286 27 fun lock (index, keys) =
ziv@2286 28 raise Fail "ToyCache doesn't yet implement lock"
ziv@2286 29
ziv@2231 30
ziv@2231 31 (* Cjr *)
ziv@2231 32
ziv@2231 33 open Print
ziv@2231 34 open Print.PD
ziv@2231 35
ziv@2231 36 fun setupQuery {index, params} =
ziv@2231 37 let
ziv@2231 38
ziv@2231 39 val i = Int.toString index
ziv@2231 40
ziv@2231 41 fun paramRepeat itemi sep =
ziv@2231 42 let
ziv@2231 43 fun f n =
ziv@2231 44 if n < 0 then ""
ziv@2231 45 else if n = 0 then itemi (Int.toString 0)
ziv@2231 46 else f (n-1) ^ sep ^ itemi (Int.toString n)
ziv@2231 47 in
ziv@2231 48 f (params - 1)
ziv@2231 49 end
ziv@2231 50
ziv@2231 51 fun paramRepeatInit itemi sep =
ziv@2231 52 if params = 0 then "" else sep ^ paramRepeat itemi sep
ziv@2231 53
ziv@2231 54 val args = paramRepeatInit (fn p => "uw_Basis_string p" ^ p) ", "
ziv@2231 55
ziv@2231 56 val decls = paramRepeat (fn p => "uw_Basis_string param" ^ i ^ "_"
ziv@2231 57 ^ p ^ " = NULL;")
ziv@2231 58 "\n"
ziv@2231 59
ziv@2231 60 val sets = paramRepeat (fn p => "param" ^ i ^ "_" ^ p
ziv@2231 61 ^ " = strdup(p" ^ p ^ ");")
ziv@2231 62 "\n"
ziv@2231 63
ziv@2231 64 val frees = paramRepeat (fn p => "free(param" ^ i ^ "_" ^ p ^ ");")
ziv@2231 65 "\n"
ziv@2231 66
ziv@2231 67 val eqs = paramRepeatInit (fn p => "strcmp(param" ^ i ^ "_" ^ p
ziv@2231 68 ^ ", p" ^ p ^ ")")
ziv@2231 69 " || "
ziv@2231 70
ziv@2231 71 (* Using [!=] instead of [==] to mimic [strcmp]. *)
ziv@2231 72 val eqsNull = paramRepeatInit (fn p => "(p" ^ p ^ " == NULL || "
ziv@2231 73 ^ "!strcmp(param" ^ i ^ "_"
ziv@2231 74 ^ p ^ ", p" ^ p ^ "))")
ziv@2231 75 " && "
ziv@2231 76
ziv@2231 77 in
ziv@2231 78 Print.box
ziv@2231 79 [string "static char *cacheQuery",
ziv@2231 80 string i,
ziv@2231 81 string " = NULL;",
ziv@2231 82 newline,
ziv@2231 83 string "static char *cacheWrite",
ziv@2231 84 string i,
ziv@2231 85 string " = NULL;",
ziv@2231 86 newline,
ziv@2231 87 string decls,
ziv@2231 88 newline,
ziv@2231 89 string "static uw_Basis_string uw_Sqlcache_check",
ziv@2231 90 string i,
ziv@2231 91 string "(uw_context ctx",
ziv@2231 92 string args,
ziv@2231 93 string ") {",
ziv@2231 94 newline,
ziv@2262 95 string "if (cacheWrite",
ziv@2231 96 string i,
ziv@2231 97 (* ASK: is returning the pointer okay? Should we duplicate? *)
ziv@2231 98 string " == NULL",
ziv@2231 99 string eqs,
ziv@2231 100 string ") {",
ziv@2231 101 newline,
ziv@2231 102 string "puts(\"SQLCACHE: miss ",
ziv@2231 103 string i,
ziv@2231 104 string ".\");",
ziv@2231 105 newline,
ziv@2231 106 string "uw_recordingStart(ctx);",
ziv@2231 107 newline,
ziv@2231 108 string "return NULL;",
ziv@2231 109 newline,
ziv@2231 110 string "} else {",
ziv@2231 111 newline,
ziv@2231 112 string "puts(\"SQLCACHE: hit ",
ziv@2231 113 string i,
ziv@2231 114 string ".\");",
ziv@2231 115 newline,
ziv@2262 116 string " if (cacheWrite",
ziv@2231 117 string i,
ziv@2262 118 string " != NULL) { uw_write(ctx, cacheWrite",
ziv@2262 119 string i,
ziv@2262 120 string "); }",
ziv@2231 121 newline,
ziv@2231 122 string "return cacheQuery",
ziv@2231 123 string i,
ziv@2231 124 string ";",
ziv@2231 125 newline,
ziv@2231 126 string "} };",
ziv@2231 127 newline,
ziv@2231 128 string "static uw_unit uw_Sqlcache_store",
ziv@2231 129 string i,
ziv@2231 130 string "(uw_context ctx, uw_Basis_string s",
ziv@2231 131 string args,
ziv@2231 132 string ") {",
ziv@2231 133 newline,
ziv@2231 134 string "free(cacheQuery",
ziv@2231 135 string i,
ziv@2231 136 string "); free(cacheWrite",
ziv@2231 137 string i,
ziv@2231 138 string ");",
ziv@2231 139 newline,
ziv@2231 140 string frees,
ziv@2231 141 newline,
ziv@2231 142 string "cacheQuery",
ziv@2231 143 string i,
ziv@2231 144 string " = strdup(s); cacheWrite",
ziv@2231 145 string i,
ziv@2231 146 string " = uw_recordingRead(ctx);",
ziv@2231 147 newline,
ziv@2231 148 string sets,
ziv@2231 149 newline,
ziv@2231 150 string "puts(\"SQLCACHE: store ",
ziv@2231 151 string i,
ziv@2231 152 string ".\");",
ziv@2231 153 newline,
ziv@2231 154 string "return uw_unit_v;",
ziv@2231 155 newline,
ziv@2231 156 string "};",
ziv@2231 157 newline,
ziv@2231 158 string "static uw_unit uw_Sqlcache_flush",
ziv@2231 159 string i,
ziv@2231 160 string "(uw_context ctx",
ziv@2231 161 string args,
ziv@2231 162 string ") {",
ziv@2231 163 newline,
ziv@2231 164 string "if (cacheQuery",
ziv@2231 165 string i,
ziv@2231 166 string " != NULL",
ziv@2231 167 string eqsNull,
ziv@2231 168 string ") {",
ziv@2231 169 newline,
ziv@2231 170 string "free(cacheQuery",
ziv@2231 171 string i,
ziv@2231 172 string ");",
ziv@2231 173 newline,
ziv@2231 174 string "cacheQuery",
ziv@2231 175 string i,
ziv@2231 176 string " = NULL;",
ziv@2231 177 newline,
ziv@2262 178 string "free(cacheWrite",
ziv@2262 179 string i,
ziv@2262 180 string ");",
ziv@2262 181 newline,
ziv@2262 182 string "cacheWrite",
ziv@2262 183 string i,
ziv@2262 184 string " = NULL;",
ziv@2262 185 newline,
ziv@2231 186 string "puts(\"SQLCACHE: flush ",
ziv@2231 187 string i,
ziv@2231 188 string ".\");}",
ziv@2231 189 newline,
ziv@2231 190 string "else { puts(\"SQLCACHE: keep ",
ziv@2231 191 string i,
ziv@2231 192 string ".\"); } return uw_unit_v;",
ziv@2231 193 newline,
ziv@2231 194 string "};",
ziv@2231 195 newline,
ziv@2231 196 newline]
ziv@2231 197 end
ziv@2231 198
ziv@2231 199 val setupGlobal = string "/* No global setup for toy cache. */"
ziv@2231 200
ziv@2233 201
ziv@2233 202 (* Bundled up. *)
ziv@2233 203
ziv@2286 204 val cache = {check = check, store = store, flush = flush, lock = lock,
ziv@2233 205 setupQuery = setupQuery, setupGlobal = setupGlobal}
ziv@2233 206
ziv@2231 207 end