LlvmCodeGen.hs 4.5 KB
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-- -----------------------------------------------------------------------------
-- | This is the top-level module in the LLVM code generator.
--

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module LlvmCodeGen ( llvmCodeGen, llvmFixupAsm ) where
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#include "HsVersions.h"

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import Llvm
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import LlvmCodeGen.Base
import LlvmCodeGen.CodeGen
import LlvmCodeGen.Data
import LlvmCodeGen.Ppr
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import LlvmMangler

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import CgUtils ( fixStgRegisters )
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import OldCmm
import OldPprCmm
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import BufWrite
import DynFlags
import ErrUtils
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import FastString
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import Outputable
import qualified Pretty as Prt
import UniqSupply
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import Util
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import SysTools ( figureLlvmVersion )
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import Data.Maybe ( fromMaybe )
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import System.IO

-- -----------------------------------------------------------------------------
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-- | Top-level of the LLVM Code generator
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--
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llvmCodeGen :: DynFlags -> Handle -> UniqSupply -> [RawCmmGroup] -> IO ()
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llvmCodeGen dflags h us cmms
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  = let cmm = concat cmms
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        (cdata,env) = foldr split ([],initLlvmEnv (targetPlatform dflags)) cmm
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        split (CmmData s d' ) (d,e) = ((s,d'):d,e)
        split (CmmProc i l _) (d,e) =
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            let lbl = strCLabel_llvm env $ case i of
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                        Nothing                   -> l
                        Just (Statics info_lbl _) -> info_lbl
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                env' = funInsert lbl llvmFunTy e
            in (d,env')
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    in do
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        showPass dflags "LlVM CodeGen"
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        bufh <- newBufHandle h
        Prt.bufLeftRender bufh $ pprLlvmHeader
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        ver  <- (fromMaybe defaultLlvmVersion) `fmap` figureLlvmVersion dflags
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        env' <- cmmDataLlvmGens dflags bufh (setLlvmVer ver env) cdata []
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        cmmProcLlvmGens dflags bufh us env' cmm 1 []
        bFlush bufh
        return  ()
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-- -----------------------------------------------------------------------------
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-- | Do LLVM code generation on all these Cmms data sections.
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--
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cmmDataLlvmGens :: DynFlags -> BufHandle -> LlvmEnv -> [(Section,CmmStatics)]
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                -> [LlvmUnresData] -> IO ( LlvmEnv )
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cmmDataLlvmGens dflags h env [] lmdata
  = let (env', lmdata') = resolveLlvmDatas env lmdata []
        lmdoc = Prt.vcat $ map pprLlvmData lmdata'
    in do
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        dumpIfSet_dyn dflags Opt_D_dump_llvm "LLVM Code" $ docToSDoc lmdoc
        Prt.bufLeftRender h lmdoc
        return env'

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cmmDataLlvmGens dflags h env (cmm:cmms) lmdata
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  = let lmdata'@(l, _, ty, _) = genLlvmData env cmm
        env' = funInsert (strCLabel_llvm env l) ty env
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    in cmmDataLlvmGens dflags h env' cmms (lmdata ++ [lmdata'])
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-- -----------------------------------------------------------------------------
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-- | Do LLVM code generation on all these Cmms procs.
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--
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cmmProcLlvmGens :: DynFlags -> BufHandle -> UniqSupply -> LlvmEnv -> [RawCmmDecl]
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      -> Int         -- ^ count, used for generating unique subsections
      -> [[LlvmVar]] -- ^ info tables that need to be marked as 'used'
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      -> IO ()

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cmmProcLlvmGens _ _ _ _ [] _ []
  = return ()
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cmmProcLlvmGens _ h _ _ [] _ ivars
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  = let ivars' = concat ivars
        cast x = LMBitc (LMStaticPointer (pVarLift x)) i8Ptr
        ty     = (LMArray (length ivars') i8Ptr)
        usedArray = LMStaticArray (map cast ivars') ty
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        lmUsed = (LMGlobalVar (fsLit "llvm.used") ty Appending
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                  (Just $ fsLit "llvm.metadata") Nothing False, Just usedArray)
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    in Prt.bufLeftRender h $ pprLlvmData ([lmUsed], [])
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cmmProcLlvmGens dflags h us env ((CmmData _ _) : cmms) count ivars
 = cmmProcLlvmGens dflags h us env cmms count ivars
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cmmProcLlvmGens dflags h us env ((CmmProc _ _ (ListGraph [])) : cmms) count ivars
 = cmmProcLlvmGens dflags h us env cmms count ivars

cmmProcLlvmGens dflags h us env (cmm : cmms) count ivars = do
    (us', env', llvm) <- cmmLlvmGen dflags us (clearVars env) cmm
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    let (docs, ivar) = mapAndUnzip (pprLlvmCmmDecl env' count) llvm
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    Prt.bufLeftRender h $ Prt.vcat docs
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    cmmProcLlvmGens dflags h us' env' cmms (count + 2) (ivar ++ ivars)
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-- | Complete LLVM code generation phase for a single top-level chunk of Cmm.
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cmmLlvmGen :: DynFlags -> UniqSupply -> LlvmEnv -> RawCmmDecl
            -> IO ( UniqSupply, LlvmEnv, [LlvmCmmDecl] )
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cmmLlvmGen dflags us env cmm = do
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    -- rewrite assignments to global regs
    let fixed_cmm = fixStgRegisters cmm

    dumpIfSet_dyn dflags Opt_D_dump_opt_cmm "Optimised Cmm"
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        (pprCmmGroup (targetPlatform dflags) [fixed_cmm])
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    -- generate llvm code from cmm
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    let ((env', llvmBC), usGen) = initUs us $ genLlvmProc env fixed_cmm
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    dumpIfSet_dyn dflags Opt_D_dump_llvm "LLVM Code"
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        (vcat $ map (docToSDoc . fst . pprLlvmCmmDecl env' 0) llvmBC)
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    return (usGen, env', llvmBC)