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[diderot] Annotation of /trunk/src/compiler/simplify/simplify.sml
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Annotation of /trunk/src/compiler/simplify/simplify.sml

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1 : jhr 171 (* simplify.sml
2 :     *
3 :     * COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)
4 :     * All rights reserved.
5 :     *
6 :     * Simplify the AST representation.
7 :     *)
8 :    
9 :     structure Simplify : sig
10 :    
11 :     val transform : AST.program -> Simple.program
12 :    
13 :     end = struct
14 :    
15 :     structure Ty = Types
16 :     structure S = Simple
17 :    
18 :     local
19 :     val tempName = Atom.atom "_t"
20 :     in
21 :     fun newTemp ty = Var.new (tempName, AST.LocalVar, ty)
22 :     end
23 :    
24 :     (* make a block out of a list of statements that are in reverse order *)
25 : jhr 197 fun mkBlock stms = S.Block(List.rev stms)
26 : jhr 171
27 : jhr 227 fun simplifyProgram (AST.Program dcls) = let
28 : jhr 171 val globals = ref []
29 :     val globalInit = ref []
30 :     val actors = ref []
31 :     fun simplifyDecl dcl = (case dcl
32 : jhr 185 of AST.D_Input(x, NONE) => let
33 : jhr 221 val e' = S.E_Input(Var.nameOf x, NONE)
34 : jhr 185 in
35 :     globals := x :: !globals;
36 : jhr 221 globalInit := S.S_Assign(x, e') :: !globalInit
37 : jhr 185 end
38 : jhr 171 | AST.D_Input(x, SOME e) => let
39 : jhr 179 val (stms, x') = simplifyExpToVar (e, [])
40 : jhr 221 val e' = S.E_Input(Var.nameOf x, SOME x')
41 : jhr 171 in
42 :     globals := x :: !globals;
43 : jhr 221 globalInit := S.S_Assign(x, e') :: (stms @ !globalInit)
44 : jhr 171 end
45 :     | AST.D_Var(AST.VD_Decl(x, e)) => let
46 :     val (stms, e') = simplifyExp (e, [])
47 :     in
48 :     globals := x :: !globals;
49 :     globalInit := S.S_Assign(x, e') :: (stms @ !globalInit)
50 :     end
51 :     | AST.D_Actor info => actors := simplifyActor info :: !actors
52 :     | AST.D_InitialArray(e, iters) => () (* FIXME *)
53 :     | AST.D_InitialCollection(e, iters) => () (* FIXME *)
54 :     (* end case *))
55 :     in
56 :     List.app simplifyDecl dcls;
57 : jhr 175 S.Program{
58 : jhr 171 globals = List.rev(!globals),
59 : jhr 227 staticInit = mkBlock [],
60 : jhr 171 globalInit = mkBlock (!globalInit),
61 :     actors = List.rev(!actors)
62 :     }
63 :     end
64 :    
65 :     and simplifyActor {name, params, state, methods} = let
66 :     fun simplifyState ([], xs, stms) = (List.rev xs, mkBlock stms)
67 :     | simplifyState (AST.VD_Decl(x, e) :: r, xs, stms) = let
68 :     val (stms, e') = simplifyExp (e, stms)
69 :     in
70 :     simplifyState (r, x::xs, S.S_Assign(x, e') :: stms)
71 :     end
72 :     val (xs, stm) = simplifyState (state, [], [])
73 :     in
74 :     S.Actor{
75 : jhr 173 name = name,
76 : jhr 171 params = params,
77 :     state = xs, stateInit = stm,
78 :     methods = List.map simplifyMethod methods
79 :     }
80 :     end
81 :    
82 :     and simplifyMethod (AST.M_Method(name, body)) =
83 : jhr 197 S.Method(name, simplifyBlock body)
84 : jhr 171
85 :     (* simplify a statement into a single statement (i.e., a block if it expands into more
86 :     * than one new statement.
87 :     *)
88 :     and simplifyBlock stm = mkBlock (simplifyStmt (stm, []))
89 :    
90 :     and simplifyStmt (stm, stms) = (case stm
91 :     of AST.S_Block body => let
92 :     fun simplify ([], stms) = stms
93 :     | simplify (stm::r, stms) = simplify (r, simplifyStmt (stm, stms))
94 :     in
95 :     simplify (body, stms)
96 :     end
97 :     | AST.S_Decl(AST.VD_Decl(x, e)) => let
98 :     val (stms, e') = simplifyExp (e, stms)
99 :     in
100 :     S.S_Assign(x, e') :: stms
101 :     end
102 :     | AST.S_IfThenElse(e, s1, s2) => let
103 :     val (stms, x) = simplifyExpToVar (e, stms)
104 :     val s1 = simplifyBlock s1
105 :     val s2 = simplifyBlock s2
106 :     in
107 :     S.S_IfThenElse(x, s1, s2) :: stms
108 :     end
109 :     | AST.S_Assign(x, e) => let
110 :     val (stms, e') = simplifyExp (e, stms)
111 :     in
112 :     S.S_Assign(x, e') :: stms
113 :     end
114 :     | AST.S_New(name, args) => let
115 :     val (stms, xs) = simplifyExpsToVars (args, stms)
116 :     in
117 :     S.S_New(name, xs) :: stms
118 :     end
119 :     | AST.S_Die => S.S_Die :: stms
120 :     | AST.S_Stabilize => S.S_Stabilize :: stms
121 :     (* end case *))
122 :    
123 :     and simplifyExp (exp, stms) = (
124 :     case exp
125 : jhr 197 of AST.E_Var x => (case Var.kindOf x
126 :     of Var.BasisVar => let
127 :     val ty = Var.monoTypeOf x
128 :     val x' = newTemp ty
129 :     val stm = S.S_Assign(x', S.E_Apply(x, [], [], ty))
130 :     in
131 :     (stm::stms, S.E_Var x')
132 :     end
133 :     | _ => (stms, S.E_Var x)
134 :     (* end case *))
135 : jhr 171 | AST.E_Lit lit => (stms, S.E_Lit lit)
136 :     | AST.E_Tuple es => raise Fail "E_Tuple not yet implemented"
137 :     | AST.E_Apply(f, tyArgs, args, ty) => let
138 :     val (stms, xs) = simplifyExpsToVars (args, stms)
139 :     in
140 :     (stms, S.E_Apply(f, tyArgs, xs, ty))
141 :     end
142 :     | AST.E_Cons es => let
143 :     val (stms, xs) = simplifyExpsToVars (es, stms)
144 :     in
145 :     (stms, S.E_Cons xs)
146 :     end
147 :     | AST.E_Cond(e1, e2, e3) => let
148 :     (* a conditional expression gets turned into an if-then-else statememt *)
149 :     val result = newTemp Ty.T_Bool
150 :     val (stms, x) = simplifyExpToVar (e1, stms)
151 :     fun simplifyBranch e = let
152 :     val (stms, e) = simplifyExp (e, [])
153 :     in
154 :     mkBlock (S.S_Assign(result, e)::stms)
155 :     end
156 :     val s1 = simplifyBranch e1
157 :     val s2 = simplifyBranch e2
158 :     in
159 :     (S.S_IfThenElse(x, s1, s2) :: stms, S.E_Var result)
160 :     end
161 :     (* end case *))
162 :    
163 :     and simplifyExpToVar (exp, stms) = let
164 :     val (stms, e) = simplifyExp (exp, stms)
165 :     in
166 :     case e
167 :     of S.E_Var x => (stms, x)
168 :     | _ => let
169 :     val x = newTemp (S.typeOf e)
170 :     in
171 :     (S.S_Assign(x, e)::stms, x)
172 :     end
173 :     (* end case *)
174 :     end
175 :    
176 :     and simplifyExpsToVars (exps, stms) = let
177 :     fun f ([], xs, stms) = (stms, List.rev xs)
178 :     | f (e::es, xs, stms) = let
179 :     val (stms, x) = simplifyExpToVar (e, stms)
180 :     in
181 :     f (es, x::xs, stms)
182 :     end
183 :     in
184 :     f (exps, [], stms)
185 :     end
186 :    
187 : jhr 227 fun transform ast = let
188 :     val simple = simplifyProgram ast
189 :     val _ = SimplePP.output (TextIO.stdOut, simple) (* DEBUG *)
190 :     val simple = Lift.transform simple
191 :     in
192 :     simple
193 :     end
194 :    
195 : jhr 171 end

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