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(* Copyright (c) 2008, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
(* Pretty-printing C jr. *)
structure CjrPrint :> CJR_PRINT = struct
open Print.PD
open Print
open Cjr
structure E = CjrEnv
structure EM = ErrorMsg
val debug = ref false
val dummyTyp = (TNamed 0, ErrorMsg.dummySpan)
fun p_typ' par env (t, loc) =
case t of
TTop => string "void*"
| TFun =>
(EM.errorAt loc "Undetermined function type";
string "?->")
| TCode (t1, t2) => parenIf par (box [p_typ' true env t2,
space,
string "(*)",
space,
string "(",
p_typ env t1,
string ")"])
| TRecord i => box [string "struct",
space,
string "__lws_",
string (Int.toString i)]
| TNamed n =>
(string ("__lwt_" ^ #1 (E.lookupTNamed env n) ^ "_" ^ Int.toString n)
handle CjrEnv.UnboundNamed _ => string ("__lwt_UNBOUND__" ^ Int.toString n))
| TFfi (m, x) => box [string "lw_", string m, string "_", string x]
and p_typ env = p_typ' false env
fun p_rel env n = string ("__lwr_" ^ #1 (E.lookupERel env n) ^ "_" ^ Int.toString (E.countERels env - n - 1))
handle CjrEnv.UnboundRel _ => string ("__lwr_UNBOUND_" ^ Int.toString (E.countERels env - n - 1))
fun p_exp' par env (e, _) =
case e of
EPrim p => Prim.p_t p
| ERel n => p_rel env n
| ENamed n =>
(string ("__lwn_" ^ #1 (E.lookupENamed env n) ^ "_" ^ Int.toString n)
handle CjrEnv.UnboundNamed _ => string ("__lwn_UNBOUND_" ^ Int.toString n))
| EFfi (m, x) => box [string "lw_", string m, string "_", string x]
| EFfiApp (m, x, es) => box [string "lw_",
string m,
string "_",
string x,
string "(",
p_list (p_exp env) es,
string ")"]
| ECode n => string ("__lwc_" ^ Int.toString n)
| EApp (e1, e2) => parenIf par (box [p_exp' true env e1,
string "(",
p_exp env e2,
string ")"])
| ERecord (i, xes) => box [string "({",
space,
string "struct",
space,
string ("__lws_" ^ Int.toString i),
space,
string "__lw_tmp",
space,
string "=",
space,
string "{",
p_list (fn (_, e) =>
p_exp env e) xes,
string "};",
space,
string "__lw_tmp;",
space,
string "})" ]
| EField (e, x) =>
box [p_exp' true env e,
string ".",
string x]
| ELet (xes, e) =>
let
val (env, pps) = foldl (fn ((x, t, e), (env, pps)) =>
let
val env' = E.pushERel env x t
in
(env',
List.revAppend ([p_typ env t,
space,
p_rel env' 0,
space,
string "=",
space,
p_exp env e,
string ";",
newline],
pps))
end)
(env, []) xes
in
box [string "({",
newline,
box (rev pps),
p_exp env e,
space,
string ";",
newline,
string "})"]
end
| EWrite e => box [string "(lw_write(",
p_exp env e,
string "), lw_unit_v)"]
and p_exp env = p_exp' false env
fun p_decl env ((d, _) : decl) =
case d of
DStruct (n, xts) =>
box [string "struct",
space,
string ("__lws_" ^ Int.toString n),
space,
string "{",
newline,
p_list_sep (box []) (fn (x, t) => box [p_typ env t,
space,
string x,
string ";",
newline]) xts,
string "};"]
| DVal (x, n, t, e) =>
box [p_typ env t,
space,
string ("__lwn_" ^ x ^ "_" ^ Int.toString n),
space,
string "=",
space,
p_exp env e,
string ";"]
| DFun (n, x, dom, ran, e) =>
let
val env' = E.pushERel env x dom
in
box [p_typ env ran,
space,
string ("__lwc_" ^ Int.toString n),
string "(",
p_typ env dom,
space,
p_rel env' 0,
string ")",
space,
string "{",
newline,
box[string "return(",
p_exp env' e,
string ");"],
newline,
string "}"]
end
fun p_page env (xts, (e, loc)) =
case e of
ERecord (_, xes) =>
let
fun read x = ListUtil.search (fn (x', e) => if x' = x then SOME e else NONE) xes
in
case (read "code", read "env") of
(SOME code, SOME envx) =>
(case #1 code of
ECode i =>
let
val (_, (dom, _), _) = E.lookupF env i
in
case dom of
TRecord ri =>
let
val axts = E.lookupStruct env ri
fun read x = ListUtil.search (fn (x', t) => if x' = x then SOME t else NONE) axts
in
case read "arg" of
NONE => string "Page handler is too complicated! [5]"
| SOME (at, _) =>
case at of
TRecord ari =>
let
val r = (ERecord (ri, [("env", envx),
("arg", (ERecord (ari, []), loc))]), loc)
in
box [p_exp env (EApp (code, r), loc),
string ";"]
end
| _ => string "Page handler is too complicated! [6]"
end
| _ => string "Page handler is too complicated! [4]"
end
| _ => string "Page handler is too complicated! [3]")
| _ => string "Page handler is too complicated! [1]"
end
| _ => string "Page handler is too complicated! [2]"
fun p_file env (ds, ps) =
let
val (pds, env) = ListUtil.foldlMap (fn (d, env) =>
(p_decl env d,
E.declBinds env d))
env ds
val pds' = map (p_page env) ps
in
box [string "#include \"lacweb.h\"",
newline,
newline,
p_list_sep newline (fn x => x) pds,
newline,
string "void lw_handle(void) {",
newline,
p_list_sep newline (fn x => x) pds',
newline,
string "}",
newline]
end
end
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