1 -- ----------------------------------------------------------------------------
2 -- | Handle conversion of CmmData to LLVM code.
5 module LlvmCodeGen.Data (
6 genLlvmData, resolveLlvmDatas, resolveLlvmData
9 #include "HsVersions.h"
12 import LlvmCodeGen.Base
20 import qualified Outputable
25 -- ----------------------------------------------------------------------------
29 -- | The string appended to a variable name to create its structure type alias
31 structStr = fsLit "_struct"
33 -- ----------------------------------------------------------------------------
37 -- | Pass a CmmStatic section to an equivalent Llvm code. Can't
38 -- complete this completely though as we need to pass all CmmStatic
39 -- sections before all references can be resolved. This last step is
40 -- done by 'resolveLlvmData'.
41 genLlvmData :: DynFlags -> (Section, [CmmStatic]) -> LlvmUnresData
42 genLlvmData _ ( _ , (CmmDataLabel lbl):xs) =
43 let static = map genData xs
44 label = strCLabel_llvm lbl
46 types = map getStatTypes static
47 getStatTypes (Left x) = cmmToLlvmType $ cmmLitType x
48 getStatTypes (Right x) = getStatType x
50 strucTy = LMStruct types
51 alias = LMAlias (label `appendFS` structStr) strucTy
52 in (lbl, alias, static)
54 genLlvmData _ _ = panic "genLlvmData: CmmData section doesn't start with label!"
56 resolveLlvmDatas :: DynFlags -> LlvmEnv -> [LlvmUnresData] -> [LlvmData]
57 -> (LlvmEnv, [LlvmData])
58 resolveLlvmDatas _ env [] ldata
61 resolveLlvmDatas dflags env (udata : rest) ldata
62 = let (env', ndata) = resolveLlvmData dflags env udata
63 in resolveLlvmDatas dflags env' rest (ldata ++ [ndata])
65 -- | Fix up CLabel references now that we should have passed all CmmData.
66 resolveLlvmData :: DynFlags -> LlvmEnv -> LlvmUnresData -> (LlvmEnv, LlvmData)
67 resolveLlvmData _ env (lbl, alias, unres) =
68 let (env', static, refs) = resDatas env unres ([], [])
69 refs' = catMaybes refs
70 struct = Just $ LMStaticStruc static alias
71 label = strCLabel_llvm lbl
72 link = if (externallyVisibleCLabel lbl)
73 then ExternallyVisible else Internal
74 glob = LMGlobalVar label alias link
75 in (env', (refs' ++ [(glob, struct)], [alias]))
78 -- ----------------------------------------------------------------------------
79 -- ** Resolve Data/CLabel references
82 -- | Resolve data list
83 resDatas :: LlvmEnv -> [UnresStatic] -> ([LlvmStatic], [Maybe LMGlobal])
84 -> (LlvmEnv, [LlvmStatic], [Maybe LMGlobal])
86 resDatas env [] (stat, glob)
89 resDatas env (cmm : rest) (stats, globs)
90 = let (env', nstat, nglob) = resData env cmm
91 in resDatas env' rest (stats ++ [nstat], globs ++ nglob)
93 -- | Resolve an individual static label if it needs to be.
95 -- We check the 'LlvmEnv' to see if the reference has been defined in this
96 -- module. If it has we can retrieve its type and make a pointer, otherwise
97 -- we introduce a generic external defenition for the referenced label and
98 -- then make a pointer.
99 resData :: LlvmEnv -> UnresStatic -> (LlvmEnv, LlvmStatic, [Maybe LMGlobal])
101 resData env (Right stat) = (env, stat, [Nothing])
103 resData env (Left cmm@(CmmLabel l)) =
104 let label = strCLabel_llvm l
105 ty = funLookup label env
106 lmty = cmmToLlvmType $ cmmLitType cmm
108 -- Make generic external label defenition and then pointer to it
110 let glob@(var, _) = genStringLabelRef label
111 env' = funInsert label (pLower $ getVarType var) env
112 ptr = LMStaticPointer var
113 in (env', LMPtoI ptr lmty, [Just glob])
114 -- Referenced data exists in this module, retrieve type and make
117 let var = LMGlobalVar label (LMPointer ty') ExternallyVisible
118 ptr = LMStaticPointer var
119 in (env, LMPtoI ptr lmty, [Nothing])
121 resData env (Left (CmmLabelOff label off)) =
122 let (env', var, glob) = resData env (Left (CmmLabel label))
123 offset = LMStaticLit $ LMIntLit (toInteger off) llvmWord
124 in (env', LMAdd var offset, glob)
126 resData env (Left (CmmLabelDiffOff l1 l2 off)) =
127 let (env1, var1, glob1) = resData env (Left (CmmLabel l1))
128 (env2, var2, glob2) = resData env1 (Left (CmmLabel l2))
129 var = LMSub var1 var2
130 offset = LMStaticLit $ LMIntLit (toInteger off) llvmWord
131 in (env2, LMAdd var offset, glob1 ++ glob2)
133 resData _ _ = panic "resData: Non CLabel expr as left type!"
135 -- ----------------------------------------------------------------------------
136 -- * Generate static data
139 -- | Handle static data
140 -- Don't handle 'CmmAlign' or a 'CmmDataLabel'.
141 genData :: CmmStatic -> UnresStatic
143 genData (CmmString str) =
144 let v = map (\x -> LMStaticLit $ LMIntLit (fromIntegral x) i8) str
145 ve = v ++ [LMStaticLit $ LMIntLit 0 i8]
146 in Right $ LMStaticArray ve (LMArray (length ve) i8)
148 genData (CmmUninitialised bytes)
149 = Right $ LMUninitType (LMArray bytes i8)
151 genData (CmmStaticLit lit)
155 = panic "genData: Can't handle CmmAlign!"
157 genData (CmmDataLabel _)
158 = panic "genData: Can't handle data labels not at top of data!"
161 -- | Generate Llvm code for a static literal.
163 -- Will either generate the code or leave it unresolved if it is a 'CLabel'
164 -- which isn't yet known.
165 genStaticLit :: CmmLit -> UnresStatic
166 genStaticLit (CmmInt i w)
167 = Right $ LMStaticLit (LMIntLit i (LMInt $ widthInBits w))
169 genStaticLit (CmmFloat r w)
170 = Right $ LMStaticLit (LMFloatLit r (widthToLlvmFloat w))
172 -- Leave unresolved, will fix later
173 genStaticLit c@(CmmLabel _ ) = Left $ c
174 genStaticLit c@(CmmLabelOff _ _) = Left $ c
175 genStaticLit c@(CmmLabelDiffOff _ _ _) = Left $ c
177 genStaticLit (CmmBlock b) = Left $ CmmLabel $ infoTblLbl b
179 genStaticLit (CmmHighStackMark)
180 = panic "genStaticLit: CmmHighStackMark unsupported!"
183 -- -----------------------------------------------------------------------------
189 panic s = Outputable.panic $ "LlvmCodeGen.Data." ++ s