1 -- -----------------------------------------------------------------------------
2 -- | This is the top-level module in the LLVM code generator.
5 module LlvmCodeGen ( llvmCodeGen, llvmFixupAsm ) where
7 #include "HsVersions.h"
11 import LlvmCodeGen.Base
12 import LlvmCodeGen.CodeGen
13 import LlvmCodeGen.Data
14 import LlvmCodeGen.Ppr
19 import CgUtils ( fixStgRegisters )
28 import qualified Pretty as Prt
31 import SysTools ( figureLlvmVersion )
33 import Data.Maybe ( fromMaybe )
36 -- -----------------------------------------------------------------------------
37 -- | Top-level of the LLVM Code generator
39 llvmCodeGen :: DynFlags -> Handle -> UniqSupply -> [RawCmm] -> IO ()
40 llvmCodeGen dflags h us cmms
41 = let cmm = concat $ map (\(Cmm top) -> top) cmms
42 (cdata,env) = foldr split ([],initLlvmEnv) cmm
43 split (CmmData s d' ) (d,e) = ((s,d'):d,e)
44 split (CmmProc i l _) (d,e) =
45 let lbl = strCLabel_llvm $ if not (null i)
46 then entryLblToInfoLbl l
48 env' = funInsert lbl llvmFunTy e
51 bufh <- newBufHandle h
52 Prt.bufLeftRender bufh $ pprLlvmHeader
53 ver <- (fromMaybe defaultLlvmVersion) `fmap` figureLlvmVersion dflags
55 env' <- cmmDataLlvmGens dflags bufh (setLlvmVer ver env) cdata []
56 cmmProcLlvmGens dflags bufh us env' cmm 1 []
62 -- -----------------------------------------------------------------------------
63 -- | Do LLVM code generation on all these Cmms data sections.
65 cmmDataLlvmGens :: DynFlags -> BufHandle -> LlvmEnv -> [(Section,[CmmStatic])]
66 -> [LlvmUnresData] -> IO ( LlvmEnv )
68 cmmDataLlvmGens dflags h env [] lmdata
69 = let (env', lmdata') = resolveLlvmDatas env lmdata []
70 lmdoc = Prt.vcat $ map pprLlvmData lmdata'
72 dumpIfSet_dyn dflags Opt_D_dump_llvm "LLVM Code" $ docToSDoc lmdoc
73 Prt.bufLeftRender h lmdoc
76 cmmDataLlvmGens dflags h env (cmm:cmms) lmdata
77 = let lmdata'@(l, _, ty, _) = genLlvmData cmm
78 env' = funInsert (strCLabel_llvm l) ty env
79 in cmmDataLlvmGens dflags h env' cmms (lmdata ++ [lmdata'])
82 -- -----------------------------------------------------------------------------
83 -- | Do LLVM code generation on all these Cmms procs.
85 cmmProcLlvmGens :: DynFlags -> BufHandle -> UniqSupply -> LlvmEnv -> [RawCmmTop]
86 -> Int -- ^ count, used for generating unique subsections
87 -> [LlvmVar] -- ^ info tables that need to be marked as 'used'
90 cmmProcLlvmGens _ _ _ _ [] _ []
93 cmmProcLlvmGens _ h _ _ [] _ ivars
94 = let cast x = LMBitc (LMStaticPointer (pVarLift x)) i8Ptr
95 ty = (LMArray (length ivars) i8Ptr)
96 usedArray = LMStaticArray (map cast ivars) ty
97 lmUsed = (LMGlobalVar (fsLit "llvm.used") ty Appending
98 (Just $ fsLit "llvm.metadata") Nothing False, Just usedArray)
99 in Prt.bufLeftRender h $ pprLlvmData ([lmUsed], [])
101 cmmProcLlvmGens dflags h us env (cmm : cmms) count ivars
103 (us', env', llvm) <- cmmLlvmGen dflags us (clearVars env) cmm
105 let (docs, ivar) = mapAndUnzip (pprLlvmCmmTop env' count) llvm
106 Prt.bufLeftRender h $ Prt.vcat docs
108 cmmProcLlvmGens dflags h us' env' cmms (count + 2) (concat ivar ++ ivars)
111 -- | Complete LLVM code generation phase for a single top-level chunk of Cmm.
112 cmmLlvmGen :: DynFlags -> UniqSupply -> LlvmEnv -> RawCmmTop
113 -> IO ( UniqSupply, LlvmEnv, [LlvmCmmTop] )
114 cmmLlvmGen dflags us env cmm
116 -- rewrite assignments to global regs
117 let fixed_cmm = fixStgRegisters cmm
119 dumpIfSet_dyn dflags Opt_D_dump_opt_cmm "Optimised Cmm"
120 (pprCmm $ Cmm [fixed_cmm])
122 -- generate llvm code from cmm
123 let ((env', llvmBC), usGen) = initUs us $ genLlvmProc env fixed_cmm
125 dumpIfSet_dyn dflags Opt_D_dump_llvm "LLVM Code"
126 (vcat $ map (docToSDoc . fst . pprLlvmCmmTop env' 0) llvmBC)
128 return (usGen, env', llvmBC)