1 {-# LANGUAGE PatternGuards #-}
4 ( cmmToZgraph, cmmOfZgraph )
10 import MkZipCfgCmm hiding (CmmGraph)
11 import ZipCfgCmmRep -- imported for reverse conversion
14 import qualified ZipCfg as G
24 cmmToZgraph :: GenCmm d h (ListGraph CmmStmt) -> UniqSM (GenCmm d h (CmmStackInfo, CmmGraph))
25 cmmOfZgraph :: GenCmm d h (CmmStackInfo, CmmGraph) -> GenCmm d h (ListGraph CmmStmt)
27 cmmToZgraph (Cmm tops) = liftM Cmm $ mapM mapTop tops
28 where mapTop (CmmProc h l args g) =
29 toZgraph (showSDoc $ ppr l) args g >>= return . CmmProc h l args
30 mapTop (CmmData s ds) = return $ CmmData s ds
31 cmmOfZgraph = cmmMapGraph (ofZgraph . snd)
33 toZgraph :: String -> CmmFormals -> ListGraph CmmStmt -> UniqSM (CmmStackInfo, CmmGraph)
34 toZgraph _ _ (ListGraph []) =
35 do g <- lgraphOfAGraph emptyAGraph
36 return ((0, Nothing), g)
37 toZgraph fun_name args g@(ListGraph (BasicBlock id ss : other_blocks)) =
38 let (offset, entry) = mkEntry id NativeNodeCall args in
39 do g <- labelAGraph id $
40 entry <*> mkStmts ss <*> foldr addBlock emptyAGraph other_blocks
41 return ((offset, Nothing), g)
42 where addBlock (BasicBlock id ss) g =
43 mkLabel id <*> mkStmts ss <*> g
44 updfr_sz = 0 -- panic "upd frame size lost in cmm conversion"
45 mkStmts (CmmNop : ss) = mkNop <*> mkStmts ss
46 mkStmts (CmmComment s : ss) = mkComment s <*> mkStmts ss
47 mkStmts (CmmAssign l r : ss) = mkAssign l r <*> mkStmts ss
48 mkStmts (CmmStore l r : ss) = mkStore l r <*> mkStmts ss
49 mkStmts (CmmCall (CmmCallee f conv) res args (CmmSafe _) CmmMayReturn : ss) =
50 mkCall f (conv', conv') (map hintlessCmm res) (map hintlessCmm args) updfr_sz
52 where conv' = Foreign (ForeignConvention conv [] []) -- JD: DUBIOUS
53 mkStmts (CmmCall (CmmPrim {}) _ _ (CmmSafe _) _ : _) =
54 panic "safe call to a primitive CmmPrim CallishMachOp"
55 mkStmts (CmmCall f res args CmmUnsafe CmmMayReturn : ss) =
56 mkUnsafeCall (convert_target f res args)
57 (strip_hints res) (strip_hints args)
59 mkStmts (CmmCondBranch e l : fbranch) =
60 mkCmmIfThenElse e (mkBranch l) (mkStmts fbranch)
61 mkStmts (last : []) = mkLast last
62 mkStmts [] = bad "fell off end"
63 mkStmts (_ : _ : _) = bad "last node not at end"
64 bad msg = pprPanic (msg ++ " in function " ++ fun_name) (ppr g)
65 mkLast (CmmCall (CmmCallee f conv) [] args _ CmmNeverReturns) =
66 mkFinalCall f conv (map hintlessCmm args) updfr_sz
67 mkLast (CmmCall (CmmPrim {}) _ _ _ CmmNeverReturns) =
68 panic "Call to CmmPrim never returns?!"
69 mkLast (CmmSwitch scrutinee table) = mkSwitch scrutinee table
70 -- SURELY, THESE HINTLESS ARGS ARE WRONG AND WILL BE FIXED WHEN CALLING
71 -- CONVENTIONS ARE HONORED?
72 mkLast (CmmJump tgt args) = mkJump tgt (map hintlessCmm args) updfr_sz
73 mkLast (CmmReturn ress) =
74 mkReturnSimple (map hintlessCmm ress) updfr_sz
75 mkLast (CmmBranch tgt) = mkBranch tgt
76 mkLast (CmmCall _f (_:_) _args _ CmmNeverReturns) =
77 panic "Call never returns but has results?!"
78 mkLast _ = panic "fell off end of block"
80 strip_hints :: [CmmHinted a] -> [a]
81 strip_hints = map hintlessCmm
83 convert_target :: CmmCallTarget -> HintedCmmFormals -> HintedCmmActuals -> MidCallTarget
84 convert_target (CmmCallee e cc) ress args = ForeignTarget e (ForeignConvention cc (map cmmHint args) (map cmmHint ress))
85 convert_target (CmmPrim op) _ress _args = PrimTarget op
87 add_hints :: Convention -> ValueDirection -> [a] -> [CmmHinted a]
88 add_hints conv vd args = zipWith CmmHinted args (get_hints conv vd)
90 get_hints :: Convention -> ValueDirection -> [ForeignHint]
91 get_hints (Foreign (ForeignConvention _ hints _)) Arguments = hints
92 get_hints (Foreign (ForeignConvention _ _ hints)) Results = hints
93 get_hints _other_conv _vd = repeat NoHint
95 get_conv :: MidCallTarget -> Convention
96 get_conv (PrimTarget _) = NativeNodeCall -- JD: SUSPICIOUS
97 get_conv (ForeignTarget _ fc) = Foreign fc
99 cmm_target :: MidCallTarget -> CmmCallTarget
100 cmm_target (PrimTarget op) = CmmPrim op
101 cmm_target (ForeignTarget e (ForeignConvention cc _ _)) = CmmCallee e cc
103 ofZgraph :: CmmGraph -> ListGraph CmmStmt
104 ofZgraph g = ListGraph $ swallow blocks
105 where blocks = G.postorder_dfs g
106 -- | the next two functions are hooks on which to hang debugging info
107 extend_entry stmts = stmts
108 extend_block _id stmts = stmts
109 _extend_entry stmts = scomment showblocks : scomment cscomm : stmts
110 showblocks = "LGraph has " ++ show (length blocks) ++ " blocks:" ++
111 concat (map (\(G.Block id _) -> " " ++ show id) blocks)
112 cscomm = "Call successors are" ++
113 (concat $ map (\id -> " " ++ show id) $ blockSetToList call_succs)
115 swallow (G.Block id t : rest) = tail id [] t rest
116 tail id prev' (G.ZTail m t) rest = tail id (mid m : prev') t rest
117 tail id prev' (G.ZLast G.LastExit) rest = exit id prev' rest
118 tail id prev' (G.ZLast (G.LastOther l)) rest = last id prev' l rest
119 mid (MidComment s) = CmmComment s
120 mid (MidAssign l r) = CmmAssign l r
121 mid (MidStore l r) = CmmStore l r
122 mid (MidForeignCall _ target ress args)
123 = CmmCall (cmm_target target)
124 (add_hints conv Results ress)
125 (add_hints conv Arguments args)
126 CmmUnsafe CmmMayReturn
128 conv = get_conv target
130 | id == G.lg_entry g = BasicBlock id $ extend_entry (reverse prev')
131 | otherwise = BasicBlock id $ extend_block id (reverse prev')
133 let endblock stmt = block' id (stmt : prev') : swallow n in
137 -- THIS OPT IS WRONG -- LABELS CAN SHOW UP ELSEWHERE IN THE GRAPH
138 --G.Block id' _ t : bs
139 -- | tgt == id', unique_pred id'
140 -- -> tail id prev' t bs -- optimize out redundant labels
141 _ -> endblock (CmmBranch tgt)
142 LastCondBranch expr tid fid ->
145 -- It would be better to handle earlier, but we still must
146 -- generate correct code here.
147 | id' == fid, tid == fid, unique_pred id' ->
149 | id' == fid, unique_pred id' ->
150 tail id (CmmCondBranch expr tid : prev') t bs
151 | id' == tid, unique_pred id',
152 Just e' <- maybeInvertCmmExpr expr ->
153 tail id (CmmCondBranch e' fid : prev') t bs
154 _ -> let instrs' = CmmBranch fid : CmmCondBranch expr tid : prev'
155 in block' id instrs' : swallow n
156 LastSwitch arg ids -> endblock $ CmmSwitch arg $ ids
157 LastCall e _ _ _ _ -> endblock $ CmmJump e []
158 exit id prev' n = -- highly irregular (assertion violation?)
159 let endblock stmt = block' id (stmt : prev') : swallow n in
160 case n of [] -> endblock (scomment "procedure falls off end")
161 G.Block id' t : bs ->
162 if unique_pred id' then
163 tail id (scomment "went thru exit" : prev') t bs
165 endblock (CmmBranch id')
170 in case lookupBlockEnv preds id of
172 Just s -> if sizeBlockSet s == 1 then
173 extendBlockSet single id
175 in G.fold_blocks add emptyBlockSet g
176 unique_pred id = elemBlockSet id single_preds
179 case G.last (G.unzip b) of
180 G.LastOther (LastCall _ (Just id) _ _ _) ->
181 extendBlockSet succs id
183 in G.fold_blocks add emptyBlockSet g
184 _is_call_succ id = elemBlockSet id call_succs
186 scomment :: String -> CmmStmt
187 scomment s = CmmComment $ mkFastString s