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1(* L3 Compiler
2 * Assembly code generator for fake x86 assembly
3 * Author: Joshua Wise <jwise@andrew.cmu.edu>
4 * Author: Chris Lu <czl@andrew.cmu.edu>
5 *)
6
7signature CODEGEN =
8sig
9 val codegen : Tree.stm list -> x86.insn list
10end
11
12structure Codegen :> CODEGEN =
13struct
14 structure T = Tree
15 structure TU = TreeUtils
16 structure X = x86
17 structure Tm = Temp
18
19 (* hasfixed : T.exp -> bool
20 * true iff the given expression has an hasfixed.
21 *)
22 fun hasfixed (T.BINOP(T.DIV, _, _)) = true
23 | hasfixed (T.BINOP(T.MOD, _, _)) = true
24 | hasfixed (T.BINOP(T.LSH, _, _)) = true
25 | hasfixed (T.BINOP(T.RSH, _, _)) = true
26 | hasfixed (T.CALL _) = true
27 | hasfixed (T.BINOP(_, a, b)) = (hasfixed a) orelse (hasfixed b)
28 | hasfixed (T.UNOP (_, a)) = hasfixed a
29 | hasfixed (T.ALLOC(_)) = true
30 | hasfixed (T.MEMORY (m,s)) = hasfixed m
31 | hasfixed (T.STMVAR _) = true
32 | hasfixed _ = false
33
34 fun offshit a b 0w4 d = [X.LEA(d, (X.REL((a, Tm.Quad), (b, Tm.Quad), 0w4), Tm.Quad))]
35 | offshit a b 0w8 d = [X.LEA(d, (X.REL((a, Tm.Quad), (b, Tm.Quad), 0w8), Tm.Quad))]
36 | offshit a b n d = [X.IMUL((b, Tm.Long), (X.CONST n, Tm.Long)), X.MOV(d, (a, Tm.Quad)), X.ADD(d, (b, Tm.Quad))]
37
38 fun binophit_c d oper e c = let val (i, s) = munch_exp d e in (i @ [oper ((d,s), (X.CONST c, s))], s) end
39 and binophit_t d oper e t =
40 let
41 val (i, s) = munch_exp d e
42 val ts = Tm.size t
43 val rs = if Tm.cmpsize (s, ts) = GREATER then s else ts
44 in
45 (i @ [oper ((d, rs), (X.TEMP t, rs))], rs)
46 end
47 and binophit d oper e1 e2 =
48 let
49 val t = X.TEMP (Tm.new "add" Tm.Long)
50 val (i1, s1) = munch_exp d e1
51 val (i2, s2) = munch_exp t e2
52(* val _ = print ("s1 = " ^ Tm.sfx s1 ^ ", s2 = " ^ Tm.sfx s2 ^ ", ") *)
53 val rs = if Tm.cmpsize (s1, s2) = GREATER then s1 else s2
54(* val _ = print ("rs = " ^ Tm.sfx rs ^ " from " ^ TU.Print.pp_exp e1 ^ " and " ^ TU.Print.pp_exp e2 ^ "\n") *)
55 in
56 (i1 @ i2 @ [oper ((d,rs), (t,rs))], rs)
57 end
58 and cmphit d a = let val (insns, pos, neg) = munch_cond a in (insns @ [X.SETcc (pos, (d, Tm.Byte)), X.MOVZB((d, Tm.Long), (d, Tm.Byte))], Tm.Long) end
59
60 (* munch_exp : prex86oper -> T.exp -> prex86insn list *)
61 (* munch_exp d e
62 * generates instructions to achieve d <- e
63 * d must be TEMP(t) or REG(r)
64 *)
65 and munch_exp d (T.CONST n) = ([X.MOV((d, Tm.Long), (X.CONST n, Tm.Long))], Tm.Long)
66 | munch_exp d (T.NULLPTR) = ([X.MOV((d, Tm.Quad), (X.CONST 0w0, Tm.Quad))], Tm.Quad)
67 | munch_exp d (T.TEMP(t)) = ([X.MOV((d, Tm.size t), (X.TEMP t, Tm.size t))], Tm.size t)
68 | munch_exp d (T.ARG(0, sz)) = ([X.MOV((d, sz), (X.REG X.EDI, sz))], sz)
69 | munch_exp d (T.ARG(1, sz)) = ([X.MOV((d, sz), (X.REG X.ESI, sz))], sz)
70 | munch_exp d (T.ARG(2, sz)) = ([X.MOV((d, sz), (X.REG X.EDX, sz))], sz)
71 | munch_exp d (T.ARG(3, sz)) = ([X.MOV((d, sz), (X.REG X.ECX, sz))], sz)
72 | munch_exp d (T.ARG(4, sz)) = ([X.MOV((d, sz), (X.REG X.R8D, sz))], sz)
73 | munch_exp d (T.ARG(5, sz)) = ([X.MOV((d, sz), (X.REG X.R9D, sz))], sz)
74 | munch_exp d (T.ARG(t, sz)) = ([X.MOV((d, sz), (X.STACKARG (t - 6), sz))], sz)
75 | munch_exp d (T.CALL(name, l, rsz)) = (* Scary demons live here. *)
76 let
77 val nargs = length l
78 val nstack = if (nargs <= 6)
79 then 0
80 else nargs - 6
81 val stackb = nstack * 8
82 fun argdest 1 = X.REG X.EDI
83 | argdest 2 = X.REG X.ESI
84 | argdest 3 = X.REG X.EDX
85 | argdest 4 = X.REG X.ECX
86 | argdest 5 = X.REG X.R8D
87 | argdest 6 = X.REG X.R9D
88 | argdest n = X.REL ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt (~(stackb - 8 * (n - 7)))), Tm.Quad), 0w1)
89
90 val dests = List.tabulate (nargs, fn x => argdest (x+1))
91 val (exps,_) = ListPair.unzip l
92 val hf = List.map hasfixed exps
93 val (d_hf, l_hf) = ListPair.unzip (ListPair.foldr
94 (fn (a,b,c) => if b then a::c else c)
95 nil
96 (ListPair.zip (dests,l), hf)
97 )
98 val (d_nohf, l_nohf) = ListPair.unzip (ListPair.foldr
99 (fn (a,b,c) => if b then c else a::c)
100 nil
101 (ListPair.zip (dests,l), hf)
102 )
103 val temps = List.map (fn (_, sz) => Temp.new ("arg") sz (* xxx? *)) l_hf
104 val (argevals_hf,_) = ListPair.unzip (List.map
105 (fn (t,(exp,_)) => munch_exp (X.TEMP t) exp)
106 (ListPair.zip (temps, l_hf)))
107 val argpushes = List.map
108 (fn (dest, t) => [X.MOV ((dest, Tm.size t), (X.TEMP t, Tm.size t))])
109 (ListPair.zip (d_hf, temps))
110 val (argevals_nohf,_) = ListPair.unzip (List.map
111 (fn (d,(exp,sz)) => munch_exp d exp)
112 (ListPair.zip (d_nohf, l_nohf)))
113 in
114 (List.concat argevals_hf @
115 List.concat argpushes @
116 List.concat argevals_nohf @
117 [ X.SUB ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt stackb), Tm.Quad)),
118 X.CALL (name, nargs),
119 X.ADD ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt stackb), Tm.Quad)),
120 X.MOV ((d, rsz), (X.REG X.EAX, rsz))], rsz) (* Finally! *)
121 end
122 | munch_exp d (T.BINOP(T.ADD, e1, T.CONST n)) = binophit_c d X.ADD e1 n
123 | munch_exp d (T.BINOP(T.ADD, T.CONST n, e1)) = binophit_c d X.ADD e1 n
124 | munch_exp d (T.BINOP(T.ADD, e1, T.TEMP t)) = binophit_t d X.ADD e1 t
125 | munch_exp d (T.BINOP(T.ADD, T.TEMP t, e1)) = binophit_t d X.ADD e1 t
126 | munch_exp d (T.BINOP(T.ADD, e1, e2)) = binophit d X.ADD e1 e2
127
128 | munch_exp d (T.BINOP(T.SUB, e1, T.CONST n)) = binophit_c d X.SUB e1 n
129 | munch_exp d (T.BINOP(T.SUB, e1, T.TEMP t)) = binophit_t d X.SUB e1 t
130 | munch_exp d (T.BINOP(T.SUB, e1, e2)) = binophit d X.SUB e1 e2
131 | munch_exp d (T.BINOP(T.MUL, T.TEMP t, T.CONST n)) = let val s = Tm.size t in ([X.IMUL3((d,s), (X.TEMP t,s), n)], Tm.size t) end
132 | munch_exp d (T.BINOP(T.MUL, T.CONST n, T.TEMP t)) = let val s = Tm.size t in ([X.IMUL3((d,s), (X.TEMP t,s), n)], Tm.size t) end
133 | munch_exp d (T.BINOP(T.MUL, e1, T.CONST n)) = binophit_c d X.IMUL e1 n
134 | munch_exp d (T.BINOP(T.MUL, T.CONST n, e1)) = binophit_c d X.IMUL e1 n
135 | munch_exp d (T.BINOP(T.MUL, e1, e2)) = binophit d X.IMUL e1 e2
136 | munch_exp d (T.BINOP(T.DIV, e1, e2)) =
137 let
138 val t1 = X.TEMP (Temp.new ("div") Tm.Long)
139 val (i1, s1) = munch_exp t1 e1
140 val (i2, s2) = munch_exp d e2
141 in
142 (i1 @ i2 @ [X.MOV ((X.REG X.EAX, s1), (t1, s1)), X.CLTD, X.IDIV (d, s2), X.MOV ((d, s2), (X.REG X.EAX, s2))], Tm.Long)
143 end
144 | munch_exp d (T.BINOP(T.MOD, e1, e2)) =
145 let
146 val t1 = X.TEMP (Temp.new ("div") Tm.Long)
147 val (i1, s1) = munch_exp t1 e1
148 val (i2, s2) = munch_exp d e2
149 in
150 (i1 @ i2 @ [X.MOV ((X.REG X.EAX, s1), (t1, s1)), X.CLTD, X.IDIV (d, s2), X.MOV ((d, s2), (X.REG X.EDX, s2))], Tm.Long)
151 end
152 | munch_exp d (T.BINOP(T.LSH, e1, T.CONST n)) = let val (i,s) = munch_exp d e1 in (i @ [X.SAL ((d,s), (X.CONST (n mod 0w32),s))],s) end
153 | munch_exp d (T.BINOP(T.LSH, e1, T.TEMP t)) =
154 let
155 val (i,s) = munch_exp d e1
156 in
157 (i @ [X.MOV ((X.REG X.ECX, s), (X.TEMP t, s)), X.SAL ((d,s), (X.REG X.ECX, Tm.Byte))], s)
158 end
159 | munch_exp d (T.BINOP(T.LSH, e1, e2)) =
160 let
161 val t = X.TEMP (Temp.new ("lsh") Tm.Long)
162 val (i1, s1) = munch_exp d e1
163 val (i2, s2) = munch_exp t e2
164 in
165 (i1 @ i2 @ [X.MOV ((X.REG X.ECX, s1), (t, s1)), X.SAL ((d, s2), (X.REG X.ECX, Tm.Byte))], s2)
166 end
167 | munch_exp d (T.BINOP(T.RSH, e1, T.CONST n)) = let val (i,s) = munch_exp d e1 in (i @ [X.SAR ((d,s), (X.CONST (n mod 0w32),s))],s) end
168 | munch_exp d (T.BINOP(T.RSH, e1, T.TEMP t)) =
169 let
170 val (i,s) = munch_exp d e1
171 in
172 (i @ [X.MOV ((X.REG X.ECX, s), (X.TEMP t, s)), X.SAR ((d,s), (X.REG X.ECX, Tm.Byte))], s)
173 end
174 | munch_exp d (T.BINOP(T.RSH, e1, e2)) =
175 let
176 val t = X.TEMP (Temp.new ("lsh") Tm.Long)
177 val (i1, s1) = munch_exp d e1
178 val (i2, s2) = munch_exp t e2
179 in
180 (i1 @ i2 @ [X.MOV ((X.REG X.ECX, s1), (t, s1)), X.SAR ((d, s2), (X.REG X.ECX, Tm.Byte))], s2)
181 end
182 | munch_exp d (T.BINOP(T.BITAND, T.CONST n, e1)) = binophit_c d X.AND e1 n
183 | munch_exp d (T.BINOP(T.BITAND, e1, T.CONST n)) = binophit_c d X.AND e1 n
184 | munch_exp d (T.BINOP(T.BITAND, T.TEMP t, e1)) = binophit_t d X.AND e1 t
185 | munch_exp d (T.BINOP(T.BITAND, e1, T.TEMP t)) = binophit_t d X.AND e1 t
186 | munch_exp d (T.BINOP(T.BITAND, e1, e2)) = binophit d X.AND e1 e2
187
188 | munch_exp d (T.BINOP(T.BITOR, T.CONST n, e1)) = binophit_c d X.OR e1 n
189 | munch_exp d (T.BINOP(T.BITOR, e1, T.CONST n)) = binophit_c d X.OR e1 n
190 | munch_exp d (T.BINOP(T.BITOR, T.TEMP t, e1)) = binophit_t d X.OR e1 t
191 | munch_exp d (T.BINOP(T.BITOR, e1, T.TEMP t)) = binophit_t d X.OR e1 t
192 | munch_exp d (T.BINOP(T.BITOR, e1, e2)) = binophit d X.OR e1 e2
193
194 | munch_exp d (T.BINOP(T.BITXOR, T.CONST n, e1)) = binophit_c d X.XOR e1 n
195 | munch_exp d (T.BINOP(T.BITXOR, e1, T.CONST n)) = binophit_c d X.XOR e1 n
196 | munch_exp d (T.BINOP(T.BITXOR, T.TEMP t, e1)) = binophit_t d X.XOR e1 t
197 | munch_exp d (T.BINOP(T.BITXOR, e1, T.TEMP t)) = binophit_t d X.XOR e1 t
198 | munch_exp d (T.BINOP(T.BITXOR, e1, e2)) = binophit d X.XOR e1 e2
199
200 | munch_exp d (a as T.BINOP(T.LOGAND, e1, e2)) =
201 let
202 val (insn1, pos1, neg1) = munch_cond e1
203 val (insn2, pos2, neg2) = munch_cond e2
204 val t1 = (X.TEMP (Tm.new "logand 1" Tm.Byte), Tm.Byte)
205 val t2 = (X.TEMP (Tm.new "logand 2" Tm.Byte), Tm.Byte)
206 val l = Label.new ()
207 in
208 if (TU.effect e2 orelse (length insn2 > 10))
209 then ((insn1) @
210 [X.SETcc(pos1, t1), X.Jcc (neg1, l)] @
211 (insn2) @
212 [X.SETcc(pos2, t1), X.LABEL l, X.MOVZB((d, Tm.Long), t1)], Tm.Long)
213 else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.AND(t1,t2), X.MOVZB((d, Tm.Long), t1)], Tm.Long)
214 end
215 | munch_exp d (a as T.BINOP(T.LOGOR, e1, e2)) =
216 let
217 val (insn1, pos1, neg1) = munch_cond e1
218 val (insn2, pos2, neg2) = munch_cond e2
219 val t1 = (X.TEMP (Tm.new "logand 1" Tm.Byte), Tm.Byte)
220 val t2 = (X.TEMP (Tm.new "logand 2" Tm.Byte), Tm.Byte)
221 val l = Label.new ()
222 in
223 if (TU.effect e2 orelse (length insn2 > 10))
224 then ((insn1) @
225 [X.SETcc(pos1, t1), X.Jcc (pos1, l)] @
226 (insn2) @
227 [X.SETcc(pos2, t1), X.LABEL l, X.MOVZB((d, Tm.Long), t1)], Tm.Long)
228 else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.OR(t1,t2), X.MOVZB((d, Tm.Long), t1)], Tm.Long)
229 end
230 | munch_exp d (a as T.BINOP(T.EQ, _, _)) = cmphit d a
231 | munch_exp d (a as T.BINOP(T.NEQ, _, _)) = cmphit d a
232 | munch_exp d (a as T.BINOP(T.LE, _, _)) = cmphit d a
233 | munch_exp d (a as T.BINOP(T.LT, _, _)) = cmphit d a
234 | munch_exp d (a as T.BINOP(T.GE, _, _)) = cmphit d a
235 | munch_exp d (a as T.BINOP(T.GT, _, _)) = cmphit d a
236 | munch_exp d (a as T.BINOP(T.BE, _, _)) = cmphit d a
237
238 | munch_exp d (T.UNOP(T.NEG, e1)) = let val (i, s) = munch_exp d e1 in (i @ [X.NEG (d, Tm.Long)], s) end
239 | munch_exp d (T.UNOP(T.BITNOT, e1)) = let val (i, s) = munch_exp d e1 in (i @ [X.NOT (d, Tm.Long)], s) end
240 | munch_exp d (T.UNOP(T.BANG, e)) =
241 let
242 val (insns, pos, neg) = munch_cond e
243 in
244 (insns @ [X.SETcc (neg, (d, Tm.Byte)), X.MOVZB((d, Tm.Long), (d, Tm.Byte))], Tm.Long)
245 end
246 | munch_exp d (T.MEMORY (e1,s)) =
247 let
248 val a = X.TEMP (Temp.new "addr" Tm.Quad)
249 val (i, s') = munch_exp a e1
250 val _ = if s' = Tm.Quad then () else raise ErrorMsg.InternalError "memory fuxed."
251 in
252 (i @ [X.MOV ((d,s), (X.REL ((a, Tm.Quad), (X.CONST 0w0, Tm.Quad), 0w1), s))], s)
253 end
254 | munch_exp d (T.ALLOC(exp)) =
255
256 let
257 val t1 = Temp.new "alloc" Tm.Long
258 val l1 = Label.new()
259 val (einsn, _) = munch_exp (X.TEMP t1) exp
260 val (insns, _) = munch_exp d (T.CALL (Symbol.symbol "calloc", [(T.TEMP t1, Tm.Long), (T.CONST 0w1, Tm.Long)], Tm.Quad))
261 val rd = (d, Tm.Quad)
262 in
263 (einsn @ insns, Tm.Quad)
264 end
265(* | munch_exp d (T.COND(c, T.CONST n1, T.CONST n2)) = let val (i,p,n) = munch_cond c in ((X.MOV (d, X.CONST n1))::i) @ [X.CMOVcc (p, d, X.CONST n2)] end *)
266 | munch_exp d (T.COND(c,e1,e2)) =
267 let
268 val (insns, pos, neg) = munch_cond c
269 val l1 = Label.new()
270 val l2 = Label.new()
271 val (i1, s1) = munch_exp d e1
272 val (i2, s2) = munch_exp d e2
273(* val _ = print ("cond: size " ^ Tm.sfx s1 ^ " from " ^ TU.Print.pp_exp e1 ^ ", " ^ Tm.sfx s2 ^ " from " ^ TU.Print.pp_exp e2 ^ "\n") *)
274 in
275 (insns @ [X.Jcc(neg, l1)] @ i1 @ [X.JMP l2, X.LABEL l1] @ i2 @ [X.LABEL l2], if s1 = s2 then s1 else raise ErrorMsg.InternalError "condfuxed.")
276 end
277 | munch_exp d (T.STMVAR (sl, e)) = let val (i, s) = munch_exp d e in (List.concat (map munch_stm sl) @ i, s) end
278
279 and condhit_tc t c (pos, neg) = ([X.CMP((X.TEMP t, Tm.size t), (X.CONST c, Tm.size t))], pos, neg)
280 and condhit_c e c (pos, neg) =
281 let
282 val t = X.TEMP (Temp.new "consthit" Tm.Long)
283 val (i,s) = munch_exp t e
284 in
285 (i @ [X.CMP ((t,s), (X.CONST c,s))], pos, neg)
286 end
287 and condhit_t e t (pos, neg) =
288 let
289 val t' = X.TEMP (Temp.new "consthit" Tm.Long)
290 val (i,s) = munch_exp t' e
291 in
292 (i @ [X.CMP ((t',s), (X.TEMP t,s))], pos, neg)
293 end
294 and condhit e1 e2 (pos, neg) =
295 let
296 val t1 = X.TEMP (Temp.new ("var neq 1") Tm.Long)
297 val t2 = X.TEMP (Temp.new ("var neq 2") Tm.Long)
298 val (i1, s1) = munch_exp t1 e1
299 val (i2, s2) = munch_exp t2 e2
300 in
301 (i1 @ i2 @ [X.CMP((t1,s1),(t2,s2))], pos, neg)
302 end
303
304 (* munch_cond : T.exp -> X.insn list * X.cond * X.cond
305 * munch_cond stm generates code to set flags, and then returns a conditional
306 * to test if the expression was true and for if it was false.
307 *)
308 and munch_cond (T.UNOP (T.BANG, e)) =
309 let
310 val (insns, pos, neg) = munch_cond e
311 in
312 (insns, neg, pos)
313 end
314 | munch_cond (T.BINOP(T.NEQ, T.TEMP t, T.CONST n)) = condhit_tc t n (X.NE, X.E)
315 | munch_cond (T.BINOP(T.NEQ, T.CONST n, T.TEMP t)) = condhit_tc t n (X.NE, X.E)
316 | munch_cond (T.BINOP(T.NEQ, T.CONST n, e1)) = condhit_c e1 n (X.NE, X.E)
317 | munch_cond (T.BINOP(T.NEQ, e1, T.CONST n)) = condhit_c e1 n (X.NE, X.E)
318 | munch_cond (T.BINOP(T.NEQ, T.TEMP t, e1)) = condhit_t e1 t (X.NE, X.E)
319 | munch_cond (T.BINOP(T.NEQ, e1, T.TEMP t)) = condhit_t e1 t (X.NE, X.E)
320 | munch_cond (T.BINOP(T.NEQ, e1, e2)) = condhit e1 e2 (X.NE, X.E)
321
322 | munch_cond (T.BINOP(T.EQ, T.TEMP t, T.CONST n)) = condhit_tc t n (X.E, X.NE)
323 | munch_cond (T.BINOP(T.EQ, T.CONST n, T.TEMP t)) = condhit_tc t n (X.E, X.NE)
324 | munch_cond (T.BINOP(T.EQ, T.CONST n, e1)) = condhit_c e1 n (X.E, X.NE)
325 | munch_cond (T.BINOP(T.EQ, e1, T.CONST n)) = condhit_c e1 n (X.E, X.NE)
326 | munch_cond (T.BINOP(T.EQ, T.TEMP t, e1)) = condhit_t e1 t (X.E, X.NE)
327 | munch_cond (T.BINOP(T.EQ, e1, T.TEMP t)) = condhit_t e1 t (X.E, X.NE)
328 | munch_cond (T.BINOP(T.EQ, e1, e2)) = condhit e1 e2 (X.E, X.NE)
329
330 | munch_cond (T.BINOP(T.LE, T.TEMP t, T.CONST n)) = condhit_tc t n (X.LE, X.G)
331 | munch_cond (T.BINOP(T.LE, T.CONST n, T.TEMP t)) = condhit_tc t n (X.GE, X.L)
332 | munch_cond (T.BINOP(T.LE, T.CONST n, e1)) = condhit_c e1 n (X.GE, X.L)
333 | munch_cond (T.BINOP(T.LE, e1, T.CONST n)) = condhit_c e1 n (X.LE, X.G)
334 | munch_cond (T.BINOP(T.LE, T.TEMP t, e1)) = condhit_t e1 t (X.GE, X.L)
335 | munch_cond (T.BINOP(T.LE, e1, T.TEMP t)) = condhit_t e1 t (X.LE, X.G)
336 | munch_cond (T.BINOP(T.LE, e1, e2)) = condhit e1 e2 (X.LE, X.G)
337
338 | munch_cond (T.BINOP(T.LT, T.TEMP t, T.CONST n)) = condhit_tc t n (X.L, X.GE)
339 | munch_cond (T.BINOP(T.LT, T.CONST n, T.TEMP t)) = condhit_tc t n (X.G, X.LE)
340 | munch_cond (T.BINOP(T.LT, T.CONST n, e1)) = condhit_c e1 n (X.G, X.LE)
341 | munch_cond (T.BINOP(T.LT, e1, T.CONST n)) = condhit_c e1 n (X.L, X.GE)
342 | munch_cond (T.BINOP(T.LT, T.TEMP t, e1)) = condhit_t e1 t (X.G, X.LE)
343 | munch_cond (T.BINOP(T.LT, e1, T.TEMP t)) = condhit_t e1 t (X.L, X.GE)
344 | munch_cond (T.BINOP(T.LT, e1, e2)) = condhit e1 e2 (X.L, X.GE)
345
346 | munch_cond (T.BINOP(T.GT, T.TEMP t, T.CONST n)) = condhit_tc t n (X.G, X.LE)
347 | munch_cond (T.BINOP(T.GT, T.CONST n, T.TEMP t)) = condhit_tc t n (X.L, X.GE)
348 | munch_cond (T.BINOP(T.GT, T.CONST n, e1)) = condhit_c e1 n (X.L, X.GE)
349 | munch_cond (T.BINOP(T.GT, e1, T.CONST n)) = condhit_c e1 n (X.G, X.LE)
350 | munch_cond (T.BINOP(T.GT, T.TEMP t, e1)) = condhit_t e1 t (X.L, X.GE)
351 | munch_cond (T.BINOP(T.GT, e1, T.TEMP t)) = condhit_t e1 t (X.G, X.LE)
352 | munch_cond (T.BINOP(T.GT, e1, e2)) = condhit e1 e2 (X.G, X.LE)
353
354 | munch_cond (T.BINOP(T.GE, T.TEMP t, T.CONST n)) = condhit_tc t n (X.GE, X.L)
355 | munch_cond (T.BINOP(T.GE, T.CONST n, T.TEMP t)) = condhit_tc t n (X.LE, X.G)
356 | munch_cond (T.BINOP(T.GE, T.CONST n, e1)) = condhit_c e1 n (X.LE, X.G)
357 | munch_cond (T.BINOP(T.GE, e1, T.CONST n)) = condhit_c e1 n (X.GE, X.L)
358 | munch_cond (T.BINOP(T.GE, T.TEMP t, e1)) = condhit_t e1 t (X.LE, X.G)
359 | munch_cond (T.BINOP(T.GE, e1, T.TEMP t)) = condhit_t e1 t (X.GE, X.L)
360 | munch_cond (T.BINOP(T.GE, e1, e2)) = condhit e1 e2 (X.GE, X.L)
361
362 | munch_cond (T.BINOP(T.BE, T.TEMP t, T.CONST n)) = condhit_tc t n (X.BE, X.A)
363 | munch_cond (T.BINOP(T.BE, T.CONST n, T.TEMP t)) = condhit_tc t n (X.AE, X.B)
364 | munch_cond (T.BINOP(T.BE, T.CONST n, e1)) = condhit_c e1 n (X.AE, X.B)
365 | munch_cond (T.BINOP(T.BE, e1, T.CONST n)) = condhit_c e1 n (X.BE, X.A)
366 | munch_cond (T.BINOP(T.BE, T.TEMP t, e1)) = condhit_t e1 t (X.AE, X.B)
367 | munch_cond (T.BINOP(T.BE, e1, T.TEMP t)) = condhit_t e1 t (X.BE, X.A)
368 | munch_cond (T.BINOP(T.BE, e1, e2)) = condhit e1 e2 (X.BE, X.A)
369
370 | munch_cond (T.BINOP(T.LOGOR, e1, e2)) =
371 let
372 val (insn1, pos1, neg1) = munch_cond e1
373 val (insn2, pos2, neg2) = munch_cond e2
374 val t1 = (X.TEMP (Temp.new("logor c 1") Tm.Byte), Tm.Byte)
375 val t2 = (X.TEMP (Temp.new("logor c 2") Tm.Byte), Tm.Byte)
376 val l = Label.new ()
377 in
378 if (TU.effect e2 orelse (length insn2 > 10))
379 then ((insn1) @
380 [X.SETcc (pos1, t1), X.Jcc (pos1, l)] @
381 (insn2) @
382 [X.SETcc (pos2, t1), X.LABEL l, X.TEST(t1, t1)],
383 X.NE, X.E)
384 else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.OR(t1, t2)], X.NE, X.E)
385 end
386 | munch_cond (T.BINOP(T.LOGAND, e1, e2)) =
387 let
388 val (insn1, pos1, neg1) = munch_cond e1
389 val (insn2, pos2, neg2) = munch_cond e2
390 val t1 = (X.TEMP (Temp.new("logand c 1") Tm.Byte), Tm.Byte)
391 val t2 = (X.TEMP (Temp.new("logand c 2") Tm.Byte), Tm.Byte)
392 val l = Label.new ()
393 in
394 if (TU.effect e2 orelse (length insn2 > 10))
395 then ((insn1) @
396 [X.SETcc (pos1, t1), X.Jcc (neg1, l)] @
397 (insn2) @
398 [X.SETcc (pos2, t1), X.LABEL l, X.TEST(t1, t1)],
399 X.NE, X.E)
400 else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.AND(t1, t2)], X.NE, X.E)
401 end
402 | munch_cond e =
403 let
404 val t = X.TEMP (Temp.new ("munch c") Tm.Long)
405 val (i, s) = munch_exp t e
406 in
407 (i @ [ X.TEST ((t,s),(t,s)) ], X.NE, X.E)
408 end
409
410 (* munch_lval : T.exp -> (X.insn list * X.operand)
411 * Takes an expression that has been typechecked as being a valid lvalue, and then returns an instruction list and an operand to store your shit in.
412 *)
413 and munch_lval (T.TEMP t) = ([], (X.TEMP t, Tm.size t))
414 | munch_lval (T.MEMORY (m,s)) =
415 let
416 val t = X.TEMP (Tm.new "lv addr" Tm.Quad)
417 val (i,s') = munch_exp t m
418 in
419 (i, (X.REL ((t, Tm.Quad), (X.CONST 0w0, Tm.Quad), 0w1), s))
420 end
421 | munch_lval _ = raise ErrorMsg.InternalError "That wasn't really a valid lvalue..."
422
423 (* munch_stm : T.stm -> X.insn list *)
424 (* munch_stm stm generates code to execute stm *)
425 and munch_stm (T.MOVE (T.TEMP t1, T.TEMP t2)) = if Tm.size t1 = Tm.size t2 then [X.MOV((X.TEMP t1, Tm.size t1), (X.TEMP t2, Tm.size t2))]
426 else raise ErrorMsg.InternalError "temp to temp move fuxed."
427 | munch_stm (T.MOVE (T.TEMP t, T.CONST n)) = if Tm.size t = Tm.Long then [X.MOV((X.TEMP t, Tm.size t), (X.CONST n, Tm.size t))]
428 else raise ErrorMsg.InternalError "const to temp move fuxed."
429 | munch_stm (T.MOVE (T.TEMP t, a as T.ARG (an, sz))) =
430 let
431 val (i, s) = munch_exp (X.TEMP t) a
432 in
433 if s = Tm.size t
434 then i
435 else raise ErrorMsg.InternalError "arg to tmp fuxed."
436 end
437 | munch_stm (T.MOVE (T.TEMP t, a as T.CALL _)) = let val (i, _) = munch_exp (X.TEMP t) a in i end
438 | munch_stm (T.MOVE (a, e2)) =
439 let
440 val t = X.TEMP (Temp.new ("assign") Tm.Long)
441 val (m, (r,s1)) = munch_lval a
442 val (i, s2) = munch_exp t e2
443(* val _ = print ("move: size " ^ Tm.sfx s2 ^ " from " ^ TU.Print.pp_exp e2 ^ ", " ^ Tm.sfx s1 ^ " from " ^ TU.Print.pp_exp a ^ "\n") *)
444 val _ = if s1 = s2 then () else raise ErrorMsg.InternalError "move generic fuxed."
445 in
446 m @ i @ [X.MOV((r,s1), (t,s2))]
447 end
448 | munch_stm (T.RETURN(e, sz)) =
449 let
450 val t = X.TEMP (Temp.new ("retval") sz)
451 val (i, s) = munch_exp t e
452 in
453 i @ [X.MOV((X.REG X.EAX, sz), (t, if sz = s then sz else raise ErrorMsg.InternalError "retfuxed.")), X.RET]
454 end
455 | munch_stm (T.LABEL l) = [X.LABEL l]
456 | munch_stm (T.JUMP l) = [X.JMP l]
457 | munch_stm (T.JUMPIFN(e, l)) =
458 let
459 val (insns, pos, neg) = munch_cond e
460 in
461 insns @ [X.Jcc (neg, l)]
462 end
463 | munch_stm (T.EFFECT exp) = let val t = X.TEMP (Temp.new "throwaway" Tm.Quad) val (i, _) = munch_exp t exp in i end
464
465 fun codegen nil = nil
466 | codegen (stm::stms) = munch_stm stm @ codegen stms
467end
Compiler for a C-like language written in SML
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