    {-# OPTIONS -w #-}
    -- The above warning supression flag is a temporary kludge.
    -- While working on this module you are encouraged to remove it and fix
    -- any warnings in the module. See
    --     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
    -- for details

    -----------------------------------------------------------------------------
    --
    -- Object-file symbols (called CLabel for histerical raisins).
    --
    -- (c) The University of Glasgow 2004-2006
    --
    -----------------------------------------------------------------------------

    module CLabel (
    	CLabel,	-- abstract type
    	ForeignLabelSource(..),
    	pprDebugCLabel,

    	mkClosureLabel,
    	mkSRTLabel,
    	mkInfoTableLabel,
    	mkEntryLabel,
    	mkSlowEntryLabel,
    	mkConEntryLabel,
    	mkStaticConEntryLabel,
    	mkRednCountsLabel,
    	mkConInfoTableLabel,
    	mkStaticInfoTableLabel,
    	mkLargeSRTLabel,
    	mkApEntryLabel,
    	mkApInfoTableLabel,
    	mkClosureTableLabel,

    	mkLocalClosureLabel,
    	mkLocalInfoTableLabel,
    	mkLocalEntryLabel,
    	mkLocalConEntryLabel,
    	mkLocalStaticConEntryLabel,
    	mkLocalConInfoTableLabel,
    	mkLocalStaticInfoTableLabel,
    	mkLocalClosureTableLabel,

    	mkReturnPtLabel,
    	mkReturnInfoLabel,
    	mkAltLabel,
    	mkDefaultLabel,
    	mkBitmapLabel,
    	mkStringLitLabel,

    	mkAsmTempLabel,

    	mkModuleInitLabel,
    	mkPlainModuleInitLabel,
    	mkModuleInitTableLabel,

    	mkSplitMarkerLabel,
    	mkDirty_MUT_VAR_Label,
    	mkUpdInfoLabel,
    	mkBHUpdInfoLabel,
    	mkIndStaticInfoLabel,
            mkMainCapabilityLabel,
    	mkMAP_FROZEN_infoLabel,
    	mkMAP_DIRTY_infoLabel,
            mkEMPTY_MVAR_infoLabel,

    	mkTopTickyCtrLabel,
            mkCAFBlackHoleInfoTableLabel,
    	mkRtsPrimOpLabel,
    	mkRtsSlowTickyCtrLabel,

    	moduleRegdLabel,
    	moduleRegTableLabel,

    	mkSelectorInfoLabel,
    	mkSelectorEntryLabel,

    	mkCmmInfoLabel,
    	mkCmmEntryLabel,
    	mkCmmRetInfoLabel,
    	mkCmmRetLabel,
    	mkCmmCodeLabel,
    	mkCmmDataLabel,
    	mkCmmGcPtrLabel,

    	mkRtsApFastLabel,

            mkPrimCallLabel,

    	mkForeignLabel,
            addLabelSize,
            foreignLabelStdcallInfo,

    	mkCCLabel, mkCCSLabel,

            DynamicLinkerLabelInfo(..),
            mkDynamicLinkerLabel,
            dynamicLinkerLabelInfo,

            mkPicBaseLabel,
            mkDeadStripPreventer,

            mkHpcTicksLabel,
            mkHpcModuleNameLabel,

            hasCAF,
    	infoLblToEntryLbl, entryLblToInfoLbl, cvtToClosureLbl, cvtToSRTLbl,
    	needsCDecl, isAsmTemp, maybeAsmTemp, externallyVisibleCLabel,
            isMathFun,
     	isCFunctionLabel, isGcPtrLabel, labelDynamic,

    	pprCLabel
        ) where

    #include "HsVersions.h"

    import IdInfo
    import StaticFlags
    import BasicTypes
    import Literal
    import Packages
    import DataCon
    import PackageConfig
    import Module
    import Name
    import Unique
    import PrimOp
    import Config
    import CostCentre
    import Outputable
    import FastString
    import DynFlags
    import UniqSet

    -- -----------------------------------------------------------------------------
    -- The CLabel type

    {-
      | CLabel is an abstract type that supports the following operations:

      - Pretty printing

      - In a C file, does it need to be declared before use?  (i.e. is it
        guaranteed to be already in scope in the places we need to refer to it?)

      - If it needs to be declared, what type (code or data) should it be
        declared to have?

      - Is it visible outside this object file or not?

      - Is it "dynamic" (see details below)

      - Eq and Ord, so that we can make sets of CLabels (currently only
        used in outputting C as far as I can tell, to avoid generating
        more than one declaration for any given label).

      - Converting an info table label into an entry label.
    -}

    data CLabel
      = -- | A label related to the definition of a particular Id or Con in a .hs file.
        IdLabel
    	Name
            CafInfo
    	IdLabelInfo		-- encodes the suffix of the label

      -- | A label from a .cmm file that is not associated with a .hs level Id.
      | CmmLabel
    	PackageId		-- what package the label belongs to.
    	FastString		-- identifier giving the prefix of the label
    	CmmLabelInfo		-- encodes the suffix of the label

      -- | A label with a baked-in \/ algorithmically generated name that definitely
      --    comes from the RTS. The code for it must compile into libHSrts.a \/ libHSrts.so
      --    If it doesn't have an algorithmically generated name then use a CmmLabel
      --    instead and give it an appropriate PackageId argument.
      | RtsLabel
    	RtsLabelInfo

      -- | A 'C' (or otherwise foreign) label.
      --
      | ForeignLabel
      	FastString    		-- name of the imported label.

            (Maybe Int)		-- possible '@n' suffix for stdcall functions
    				-- When generating C, the '@n' suffix is omitted, but when
    				-- generating assembler we must add it to the label.

    	ForeignLabelSource	-- what package the foreign label is in.

            FunctionOrData

      -- | A family of labels related to a particular case expression.
      | CaseLabel
    	{-# UNPACK #-} !Unique	-- Unique says which case expression
    	CaseLabelInfo

      | AsmTempLabel
    	{-# UNPACK #-} !Unique

      | StringLitLabel
    	{-# UNPACK #-} !Unique

      | ModuleInitLabel
    	Module			-- the module name
    	String			-- its "way"
    	-- at some point we might want some kind of version number in
    	-- the module init label, to guard against compiling modules in
    	-- the wrong order.  We can't use the interface file version however,
    	-- because we don't always recompile modules which depend on a module
    	-- whose version has changed.

      | PlainModuleInitLabel	-- without the version & way info
    	Module

      | ModuleInitTableLabel	-- table of imported modules to init
    	Module

      | ModuleRegdLabel

      | CC_Label  CostCentre
      | CCS_Label CostCentreStack

      -- | These labels are generated and used inside the NCG only.
      -- 	They are special variants of a label used for dynamic linking
      --    see module PositionIndependentCode for details.
      | DynamicLinkerLabel DynamicLinkerLabelInfo CLabel

      -- | This label is generated and used inside the NCG only.
      -- 	It is used as a base for PIC calculations on some platforms.
      --    It takes the form of a local numeric assembler label '1'; and
      --    is pretty-printed as 1b, referring to the previous definition
      --    of 1: in the assembler source file.
      | PicBaseLabel

      -- | A label before an info table to prevent excessive dead-stripping on darwin
      | DeadStripPreventer CLabel

      -- | Per-module table of tick locations
      | HpcTicksLabel Module

      -- | Per-module name of the module for Hpc
      | HpcModuleNameLabel

      -- | Label of an StgLargeSRT
      | LargeSRTLabel
            {-# UNPACK #-} !Unique

      -- | A bitmap (function or case return)
      | LargeBitmapLabel
            {-# UNPACK #-} !Unique

      deriving (Eq, Ord)

    -- | Record where a foreign label is stored.
    data ForeignLabelSource

       -- | Label is in a named package
       = ForeignLabelInPackage	PackageId

       -- | Label is in some external, system package that doesn't also
       --	contain compiled Haskell code, and is not associated with any .hi files.
       --	We don't have to worry about Haskell code being inlined from
       --	external packages. It is safe to treat the RTS package as "external".
       | ForeignLabelInExternalPackage

       -- | Label is in the package currenly being compiled.
       --	This is only used for creating hacky tmp labels during code generation.
       --	Don't use it in any code that might be inlined across a package boundary
       --	(ie, core code) else the information will be wrong relative to the
       --	destination module.
       | ForeignLabelInThisPackage

       deriving (Eq, Ord)

    -- | For debugging problems with the CLabel representation.
    --	We can't make a Show instance for CLabel because lots of its components don't have instances.
    --	The regular Outputable instance only shows the label name, and not its other info.
    --
    pprDebugCLabel :: CLabel -> SDoc
    pprDebugCLabel lbl
     = case lbl of
     	IdLabel{}	-> ppr lbl <> (parens $ text "IdLabel")
    	CmmLabel pkg name _info
    	 -> ppr lbl <> (parens $ text "CmmLabel" <+> ppr pkg)

    	RtsLabel{}	-> ppr lbl <> (parens $ text "RtsLabel")

    	ForeignLabel name mSuffix src funOrData
    	 -> ppr lbl <> (parens
    	 			$ text "ForeignLabel"
    	 			<+> ppr mSuffix
    				<+> ppr src
    				<+> ppr funOrData)

    	_		-> ppr lbl <> (parens $ text "other CLabel)")

    data IdLabelInfo
      = Closure		-- ^ Label for closure
      | SRT                 -- ^ Static reference table
      | InfoTable		-- ^ Info tables for closures; always read-only
      | Entry		-- ^ Entry point
      | Slow		-- ^ Slow entry point

      | RednCounts		-- ^ Label of place to keep Ticky-ticky  info for this Id

      | ConEntry	  	-- ^ Constructor entry point
      | ConInfoTable 	-- ^ Corresponding info table
      | StaticConEntry  	-- ^ Static constructor entry point
      | StaticInfoTable   	-- ^ Corresponding info table

      | ClosureTable	-- ^ Table of closures for Enum tycons

      deriving (Eq, Ord)

    data CaseLabelInfo
      = CaseReturnPt
      | CaseReturnInfo
      | CaseAlt ConTag
      | CaseDefault
      deriving (Eq, Ord)

    data RtsLabelInfo
      = RtsSelectorInfoTable Bool{-updatable-} Int{-offset-}  -- ^ Selector thunks
      | RtsSelectorEntry     Bool{-updatable-} Int{-offset-}

      | RtsApInfoTable       Bool{-updatable-} Int{-arity-}    -- ^ AP thunks
      | RtsApEntry           Bool{-updatable-} Int{-arity-}

      | RtsPrimOp PrimOp
      | RtsApFast	  FastString	-- ^ _fast versions of generic apply
      | RtsSlowTickyCtr String

      deriving (Eq, Ord)
      -- NOTE: Eq on LitString compares the pointer only, so this isn't
      -- a real equality.

    -- | What type of Cmm label we're dealing with.
    -- 	Determines the suffix appended to the name when a CLabel.CmmLabel
    --	is pretty printed.
    data CmmLabelInfo
      = CmmInfo       		-- ^ misc rts info tabless,	suffix _info
      | CmmEntry      		-- ^ misc rts entry points,	suffix _entry
      | CmmRetInfo    		-- ^ misc rts ret info tables,	suffix _info
      | CmmRet        		-- ^ misc rts return points,	suffix _ret
      | CmmData       		-- ^ misc rts data bits, eg CHARLIKE_closure
      | CmmCode       		-- ^ misc rts code
      | CmmGcPtr			-- ^ GcPtrs eg CHARLIKE_closure
      | CmmPrimCall			-- ^ a prim call to some hand written Cmm code
      deriving (Eq, Ord)

    data DynamicLinkerLabelInfo
      = CodeStub			-- MachO: Lfoo$stub, ELF: foo@plt
      | SymbolPtr			-- MachO: Lfoo$non_lazy_ptr, Windows: __imp_foo
      | GotSymbolPtr		-- ELF: foo@got
      | GotSymbolOffset		-- ELF: foo@gotoff

      deriving (Eq, Ord)

    -- -----------------------------------------------------------------------------
    -- Constructing CLabels
    -- -----------------------------------------------------------------------------

    -- Constructing IdLabels
    -- These are always local:
    mkSRTLabel		name c	= IdLabel name  c SRT
    mkSlowEntryLabel      	name c 	= IdLabel name  c Slow
    mkRednCountsLabel     	name c 	= IdLabel name  c RednCounts

    -- These have local & (possibly) external variants:
    mkLocalClosureLabel	name c 	= IdLabel name  c Closure
    mkLocalInfoTableLabel  	name c 	= IdLabel name  c InfoTable
    mkLocalEntryLabel	name c 	= IdLabel name  c Entry
    mkLocalClosureTableLabel name c = IdLabel name  c ClosureTable

    mkClosureLabel name         c     = IdLabel name c Closure
    mkInfoTableLabel name       c     = IdLabel name c InfoTable
    mkEntryLabel name           c     = IdLabel name c Entry
    mkClosureTableLabel name    c     = IdLabel name c ClosureTable
    mkLocalConInfoTableLabel    c con = IdLabel con c ConInfoTable
    mkLocalConEntryLabel	    c con = IdLabel con c ConEntry
    mkLocalStaticInfoTableLabel c con = IdLabel con c StaticInfoTable
    mkLocalStaticConEntryLabel  c con = IdLabel con c StaticConEntry
    mkConInfoTableLabel name    c     = IdLabel    name c ConInfoTable
    mkStaticInfoTableLabel name c     = IdLabel    name c StaticInfoTable

    mkConEntryLabel name        c     = IdLabel name c ConEntry
    mkStaticConEntryLabel name  c     = IdLabel name c StaticConEntry

    -- Constructing Cmm Labels
    mkSplitMarkerLabel		= CmmLabel rtsPackageId (fsLit "__stg_split_marker")	CmmCode
    mkDirty_MUT_VAR_Label		= CmmLabel rtsPackageId (fsLit "dirty_MUT_VAR")		CmmCode
    mkUpdInfoLabel			= CmmLabel rtsPackageId (fsLit "stg_upd_frame")		CmmInfo
    mkBHUpdInfoLabel		= CmmLabel rtsPackageId (fsLit "stg_bh_upd_frame" )     CmmInfo
    mkIndStaticInfoLabel		= CmmLabel rtsPackageId (fsLit "stg_IND_STATIC")	CmmInfo
    mkMainCapabilityLabel		= CmmLabel rtsPackageId (fsLit "MainCapability")	CmmData
    mkMAP_FROZEN_infoLabel		= CmmLabel rtsPackageId (fsLit "stg_MUT_ARR_PTRS_FROZEN0") CmmInfo
    mkMAP_DIRTY_infoLabel		= CmmLabel rtsPackageId (fsLit "stg_MUT_ARR_PTRS_DIRTY") CmmInfo
    mkEMPTY_MVAR_infoLabel		= CmmLabel rtsPackageId (fsLit "stg_EMPTY_MVAR")	CmmInfo
    mkTopTickyCtrLabel		= CmmLabel rtsPackageId (fsLit "top_ct")		CmmData
    mkCAFBlackHoleInfoTableLabel	= CmmLabel rtsPackageId (fsLit "stg_CAF_BLACKHOLE")	CmmInfo

    -----
    mkCmmInfoLabel,   mkCmmEntryLabel, mkCmmRetInfoLabel, mkCmmRetLabel,
      mkCmmCodeLabel, mkCmmDataLabel,  mkCmmGcPtrLabel
    	:: PackageId -> FastString -> CLabel

    mkCmmInfoLabel      pkg str 	= CmmLabel pkg str CmmInfo
    mkCmmEntryLabel     pkg str 	= CmmLabel pkg str CmmEntry
    mkCmmRetInfoLabel   pkg str 	= CmmLabel pkg str CmmRetInfo
    mkCmmRetLabel       pkg str 	= CmmLabel pkg str CmmRet
    mkCmmCodeLabel      pkg str	= CmmLabel pkg str CmmCode
    mkCmmDataLabel      pkg str	= CmmLabel pkg str CmmData
    mkCmmGcPtrLabel     pkg str	= CmmLabel pkg str CmmGcPtr

    -- Constructing RtsLabels
    mkRtsPrimOpLabel primop		= RtsLabel (RtsPrimOp primop)

    mkSelectorInfoLabel  upd off	= RtsLabel (RtsSelectorInfoTable upd off)
    mkSelectorEntryLabel upd off	= RtsLabel (RtsSelectorEntry     upd off)

    mkApInfoTableLabel   upd off	= RtsLabel (RtsApInfoTable       upd off)
    mkApEntryLabel       upd off	= RtsLabel (RtsApEntry           upd off)

    -- A call to some primitive hand written Cmm code
    mkPrimCallLabel :: PrimCall -> CLabel
    mkPrimCallLabel (PrimCall str pkg)
    	= CmmLabel pkg str CmmPrimCall

    -- Constructing ForeignLabels

    -- | Make a foreign label
    mkForeignLabel
    	:: FastString 		-- name
    	-> Maybe Int 		-- size prefix
    	-> ForeignLabelSource	-- what package it's in
    	-> FunctionOrData
    	-> CLabel

    mkForeignLabel str mb_sz src fod
        = ForeignLabel str mb_sz src  fod

    -- | Update the label size field in a ForeignLabel
    addLabelSize :: CLabel -> Int -> CLabel
    addLabelSize (ForeignLabel str _ src  fod) sz
        = ForeignLabel str (Just sz) src fod
    addLabelSize label _
        = label

    -- | Get the label size field from a ForeignLabel
    foreignLabelStdcallInfo :: CLabel -> Maybe Int
    foreignLabelStdcallInfo (ForeignLabel _ info _ _) = info
    foreignLabelStdcallInfo _lbl = Nothing

    -- Constructing Large*Labels
    mkLargeSRTLabel	uniq		= LargeSRTLabel uniq
    mkBitmapLabel	uniq		= LargeBitmapLabel uniq

    -- Constructin CaseLabels
    mkReturnPtLabel uniq		= CaseLabel uniq CaseReturnPt
    mkReturnInfoLabel uniq		= CaseLabel uniq CaseReturnInfo
    mkAltLabel      uniq tag	= CaseLabel uniq (CaseAlt tag)
    mkDefaultLabel  uniq 		= CaseLabel uniq CaseDefault

    -- Constructing Cost Center Labels
    mkCCLabel	    cc		= CC_Label cc
    mkCCSLabel	    ccs		= CCS_Label ccs

    mkRtsApFastLabel str = RtsLabel (RtsApFast str)

    mkRtsSlowTickyCtrLabel :: String -> CLabel
    mkRtsSlowTickyCtrLabel pat = RtsLabel (RtsSlowTickyCtr pat)

    -- Constructing Code Coverage Labels
    mkHpcTicksLabel                = HpcTicksLabel
    mkHpcModuleNameLabel           = HpcModuleNameLabel

    -- Constructing labels used for dynamic linking
    mkDynamicLinkerLabel :: DynamicLinkerLabelInfo -> CLabel -> CLabel
    mkDynamicLinkerLabel 		= DynamicLinkerLabel

    dynamicLinkerLabelInfo :: CLabel -> Maybe (DynamicLinkerLabelInfo, CLabel)
    dynamicLinkerLabelInfo (DynamicLinkerLabel info lbl) = Just (info, lbl)
    dynamicLinkerLabelInfo _ 	= Nothing

    mkPicBaseLabel :: CLabel
    mkPicBaseLabel 			= PicBaseLabel

    -- Constructing miscellaneous other labels
    mkDeadStripPreventer :: CLabel -> CLabel
    mkDeadStripPreventer lbl	= DeadStripPreventer lbl

    mkStringLitLabel :: Unique -> CLabel
    mkStringLitLabel		= StringLitLabel

    mkAsmTempLabel :: Uniquable a => a -> CLabel
    mkAsmTempLabel a		= AsmTempLabel (getUnique a)

    mkModuleInitLabel :: Module -> String -> CLabel
    mkModuleInitLabel mod way	= ModuleInitLabel mod way

    mkPlainModuleInitLabel :: Module -> CLabel
    mkPlainModuleInitLabel mod	= PlainModuleInitLabel mod

    mkModuleInitTableLabel :: Module -> CLabel
    mkModuleInitTableLabel mod	= ModuleInitTableLabel mod

    moduleRegdLabel			= ModuleRegdLabel
    moduleRegTableLabel		= ModuleInitTableLabel

    -- -----------------------------------------------------------------------------
    -- Converting between info labels and entry/ret labels.

    infoLblToEntryLbl :: CLabel -> CLabel
    infoLblToEntryLbl (IdLabel n c InfoTable)	= IdLabel n c Entry
    infoLblToEntryLbl (IdLabel n c ConInfoTable)	= IdLabel n c ConEntry
    infoLblToEntryLbl (IdLabel n c StaticInfoTable)	= IdLabel n c StaticConEntry
    infoLblToEntryLbl (CaseLabel n CaseReturnInfo)	= CaseLabel n CaseReturnPt
    infoLblToEntryLbl (CmmLabel m str CmmInfo)	= CmmLabel m str CmmEntry
    infoLblToEntryLbl (CmmLabel m str CmmRetInfo)	= CmmLabel m str CmmRet
    infoLblToEntryLbl _
    	= panic "CLabel.infoLblToEntryLbl"

    entryLblToInfoLbl :: CLabel -> CLabel
    entryLblToInfoLbl (IdLabel n c Entry)		= IdLabel n c InfoTable
    entryLblToInfoLbl (IdLabel n c ConEntry)	= IdLabel n c ConInfoTable
    entryLblToInfoLbl (IdLabel n c StaticConEntry)	= IdLabel n c StaticInfoTable
    entryLblToInfoLbl (CaseLabel n CaseReturnPt)	= CaseLabel n CaseReturnInfo
    entryLblToInfoLbl (CmmLabel m str CmmEntry)	= CmmLabel m str CmmInfo
    entryLblToInfoLbl (CmmLabel m str CmmRet)	= CmmLabel m str CmmRetInfo
    entryLblToInfoLbl l
    	= pprPanic "CLabel.entryLblToInfoLbl" (pprCLabel l)

    cvtToClosureLbl   (IdLabel n c InfoTable)	= IdLabel n c Closure
    cvtToClosureLbl   (IdLabel n c Entry)		= IdLabel n c Closure
    cvtToClosureLbl   (IdLabel n c ConEntry)	= IdLabel n c Closure
    cvtToClosureLbl l@(IdLabel n c Closure)		= l
    cvtToClosureLbl l
    	= pprPanic "cvtToClosureLbl" (pprCLabel l)

    cvtToSRTLbl   (IdLabel n c InfoTable)		= mkSRTLabel n c
    cvtToSRTLbl   (IdLabel n c Entry)		= mkSRTLabel n c
    cvtToSRTLbl   (IdLabel n c ConEntry)		= mkSRTLabel n c
    cvtToSRTLbl l@(IdLabel n c Closure)		= mkSRTLabel n c
    cvtToSRTLbl l
    	= pprPanic "cvtToSRTLbl" (pprCLabel l)

    -- -----------------------------------------------------------------------------
    -- Does a CLabel refer to a CAF?
    hasCAF :: CLabel -> Bool
    hasCAF (IdLabel _ MayHaveCafRefs _) = True
    hasCAF _                            = False

    -- -----------------------------------------------------------------------------
    -- Does a CLabel need declaring before use or not?
    --
    -- See wiki:Commentary/Compiler/Backends/PprC#Prototypes

    needsCDecl :: CLabel -> Bool
      -- False <=> it's pre-declared; don't bother
      -- don't bother declaring SRT & Bitmap labels, we always make sure
      -- they are defined before use.
    needsCDecl (IdLabel _ _ SRT)		= False
    needsCDecl (LargeSRTLabel _)		= False
    needsCDecl (LargeBitmapLabel _)		= False
    needsCDecl (IdLabel _ _ _)		= True
    needsCDecl (CaseLabel _ _)	        = True
    needsCDecl (ModuleInitLabel _ _)	= True
    needsCDecl (PlainModuleInitLabel _)	= True
    needsCDecl (ModuleInitTableLabel _)	= True
    needsCDecl ModuleRegdLabel		= False

    needsCDecl (StringLitLabel _)		= False
    needsCDecl (AsmTempLabel _)		= False
    needsCDecl (RtsLabel _)			= False

    needsCDecl (CmmLabel pkgId _ _)
    	-- Prototypes for labels defined in the runtime system are imported
    	--	into HC files via includes/Stg.h.
    	| pkgId == rtsPackageId		= False

    	-- For other labels we inline one into the HC file directly.
    	| otherwise			= True

    needsCDecl l@(ForeignLabel{})		= not (isMathFun l)
    needsCDecl (CC_Label _)			= True
    needsCDecl (CCS_Label _)		= True
    needsCDecl (HpcTicksLabel _)            = True
    needsCDecl HpcModuleNameLabel           = False

    -- | Check whether a label is a local temporary for native code generation
    isAsmTemp  :: CLabel -> Bool
    isAsmTemp (AsmTempLabel _) 		= True
    isAsmTemp _ 	    	   		= False

    -- | If a label is a local temporary used for native code generation
    --      then return just its unique, otherwise nothing.
    maybeAsmTemp :: CLabel -> Maybe Unique
    maybeAsmTemp (AsmTempLabel uq) 		= Just uq
    maybeAsmTemp _ 	    	       		= Nothing

    -- | Check whether a label corresponds to a C function that has
    --      a prototype in a system header somehere, or is built-in
    --      to the C compiler. For these labels we abovoid generating our
    --      own C prototypes.
    isMathFun :: CLabel -> Bool
    isMathFun (ForeignLabel fs _ _ _) 	= fs `elementOfUniqSet` math_funs
    isMathFun _ = False

    math_funs = mkUniqSet [
            -- _ISOC99_SOURCE
            (fsLit "acos"),         (fsLit "acosf"),        (fsLit "acosh"),
            (fsLit "acoshf"),       (fsLit "acoshl"),       (fsLit "acosl"),
            (fsLit "asin"),         (fsLit "asinf"),        (fsLit "asinl"),
            (fsLit "asinh"),        (fsLit "asinhf"),       (fsLit "asinhl"),
            (fsLit "atan"),         (fsLit "atanf"),        (fsLit "atanl"),
            (fsLit "atan2"),        (fsLit "atan2f"),       (fsLit "atan2l"),
            (fsLit "atanh"),        (fsLit "atanhf"),       (fsLit "atanhl"),
            (fsLit "cbrt"),         (fsLit "cbrtf"),        (fsLit "cbrtl"),
            (fsLit "ceil"),         (fsLit "ceilf"),        (fsLit "ceill"),
            (fsLit "copysign"),     (fsLit "copysignf"),    (fsLit "copysignl"),
            (fsLit "cos"),          (fsLit "cosf"),         (fsLit "cosl"),
            (fsLit "cosh"),         (fsLit "coshf"),        (fsLit "coshl"),
            (fsLit "erf"),          (fsLit "erff"),         (fsLit "erfl"),
            (fsLit "erfc"),         (fsLit "erfcf"),        (fsLit "erfcl"),
            (fsLit "exp"),          (fsLit "expf"),         (fsLit "expl"),
            (fsLit "exp2"),         (fsLit "exp2f"),        (fsLit "exp2l"),
            (fsLit "expm1"),        (fsLit "expm1f"),       (fsLit "expm1l"),
            (fsLit "fabs"),         (fsLit "fabsf"),        (fsLit "fabsl"),
            (fsLit "fdim"),         (fsLit "fdimf"),        (fsLit "fdiml"),
            (fsLit "floor"),        (fsLit "floorf"),       (fsLit "floorl"),
            (fsLit "fma"),          (fsLit "fmaf"),         (fsLit "fmal"),
            (fsLit "fmax"),         (fsLit "fmaxf"),        (fsLit "fmaxl"),
            (fsLit "fmin"),         (fsLit "fminf"),        (fsLit "fminl"),
            (fsLit "fmod"),         (fsLit "fmodf"),        (fsLit "fmodl"),
            (fsLit "frexp"),        (fsLit "frexpf"),       (fsLit "frexpl"),
            (fsLit "hypot"),        (fsLit "hypotf"),       (fsLit "hypotl"),
            (fsLit "ilogb"),        (fsLit "ilogbf"),       (fsLit "ilogbl"),
            (fsLit "ldexp"),        (fsLit "ldexpf"),       (fsLit "ldexpl"),
            (fsLit "lgamma"),       (fsLit "lgammaf"),      (fsLit "lgammal"),
            (fsLit "llrint"),       (fsLit "llrintf"),      (fsLit "llrintl"),
            (fsLit "llround"),      (fsLit "llroundf"),     (fsLit "llroundl"),
            (fsLit "log"),          (fsLit "logf"),         (fsLit "logl"),
            (fsLit "log10l"),       (fsLit "log10"),        (fsLit "log10f"),
            (fsLit "log1pl"),       (fsLit "log1p"),        (fsLit "log1pf"),
            (fsLit "log2"),         (fsLit "log2f"),        (fsLit "log2l"),
            (fsLit "logb"),         (fsLit "logbf"),        (fsLit "logbl"),
            (fsLit "lrint"),        (fsLit "lrintf"),       (fsLit "lrintl"),
            (fsLit "lround"),       (fsLit "lroundf"),      (fsLit "lroundl"),
            (fsLit "modf"),         (fsLit "modff"),        (fsLit "modfl"),
            (fsLit "nan"),          (fsLit "nanf"),         (fsLit "nanl"),
            (fsLit "nearbyint"),    (fsLit "nearbyintf"),   (fsLit "nearbyintl"),
            (fsLit "nextafter"),    (fsLit "nextafterf"),   (fsLit "nextafterl"),
            (fsLit "nexttoward"),   (fsLit "nexttowardf"),  (fsLit "nexttowardl"),
            (fsLit "pow"),          (fsLit "powf"),         (fsLit "powl"),
            (fsLit "remainder"),    (fsLit "remainderf"),   (fsLit "remainderl"),
            (fsLit "remquo"),       (fsLit "remquof"),      (fsLit "remquol"),
            (fsLit "rint"),         (fsLit "rintf"),        (fsLit "rintl"),
            (fsLit "round"),        (fsLit "roundf"),       (fsLit "roundl"),
            (fsLit "scalbln"),      (fsLit "scalblnf"),     (fsLit "scalblnl"),
            (fsLit "scalbn"),       (fsLit "scalbnf"),      (fsLit "scalbnl"),
            (fsLit "sin"),          (fsLit "sinf"),         (fsLit "sinl"),
            (fsLit "sinh"),         (fsLit "sinhf"),        (fsLit "sinhl"),
            (fsLit "sqrt"),         (fsLit "sqrtf"),        (fsLit "sqrtl"),
            (fsLit "tan"),          (fsLit "tanf"),         (fsLit "tanl"),
            (fsLit "tanh"),         (fsLit "tanhf"),        (fsLit "tanhl"),
            (fsLit "tgamma"),       (fsLit "tgammaf"),      (fsLit "tgammal"),
            (fsLit "trunc"),        (fsLit "truncf"),       (fsLit "truncl"),
            -- ISO C 99 also defines these function-like macros in math.h:
            -- fpclassify, isfinite, isinf, isnormal, signbit, isgreater,
            -- isgreaterequal, isless, islessequal, islessgreater, isunordered

            -- additional symbols from _BSD_SOURCE
            (fsLit "drem"),         (fsLit "dremf"),        (fsLit "dreml"),
            (fsLit "finite"),       (fsLit "finitef"),      (fsLit "finitel"),
            (fsLit "gamma"),        (fsLit "gammaf"),       (fsLit "gammal"),
            (fsLit "isinf"),        (fsLit "isinff"),       (fsLit "isinfl"),
            (fsLit "isnan"),        (fsLit "isnanf"),       (fsLit "isnanl"),
            (fsLit "j0"),           (fsLit "j0f"),          (fsLit "j0l"),
            (fsLit "j1"),           (fsLit "j1f"),          (fsLit "j1l"),
            (fsLit "jn"),           (fsLit "jnf"),          (fsLit "jnl"),
            (fsLit "lgamma_r"),     (fsLit "lgammaf_r"),    (fsLit "lgammal_r"),
            (fsLit "scalb"),        (fsLit "scalbf"),       (fsLit "scalbl"),
            (fsLit "significand"),  (fsLit "significandf"), (fsLit "significandl"),
            (fsLit "y0"),           (fsLit "y0f"),          (fsLit "y0l"),
            (fsLit "y1"),           (fsLit "y1f"),          (fsLit "y1l"),
            (fsLit "yn"),           (fsLit "ynf"),          (fsLit "ynl")
        ]

    -- -----------------------------------------------------------------------------
    -- | Is a CLabel visible outside this object file or not?
    -- 	From the point of view of the code generator, a name is
    -- 	externally visible if it has to be declared as exported
    -- 	in the .o file's symbol table; that is, made non-static.
    externallyVisibleCLabel :: CLabel -> Bool -- not C "static"
    externallyVisibleCLabel (CaseLabel _ _)		= False
    externallyVisibleCLabel (StringLitLabel _)	= False
    externallyVisibleCLabel (AsmTempLabel _)	= False
    externallyVisibleCLabel (ModuleInitLabel _ _)	= True
    externallyVisibleCLabel (PlainModuleInitLabel _)= True
    externallyVisibleCLabel (ModuleInitTableLabel _)= False
    externallyVisibleCLabel ModuleRegdLabel		= False
    externallyVisibleCLabel (RtsLabel _)		= True
    externallyVisibleCLabel (CmmLabel _ _ _)	= True
    externallyVisibleCLabel (ForeignLabel{})	= True
    externallyVisibleCLabel (IdLabel name _ _)	= isExternalName name
    externallyVisibleCLabel (CC_Label _)		= True
    externallyVisibleCLabel (CCS_Label _)		= True
    externallyVisibleCLabel (DynamicLinkerLabel _ _)  = False
    externallyVisibleCLabel (HpcTicksLabel _)	= True
    externallyVisibleCLabel HpcModuleNameLabel	= False
    externallyVisibleCLabel (LargeBitmapLabel _)	= False
    externallyVisibleCLabel (LargeSRTLabel _)	= False

    -- -----------------------------------------------------------------------------
    -- Finding the "type" of a CLabel

    -- For generating correct types in label declarations:

    data CLabelType
      = CodeLabel	-- Address of some executable instructions
      | DataLabel	-- Address of data, not a GC ptr
      | GcPtrLabel	-- Address of a (presumably static) GC object

    isCFunctionLabel :: CLabel -> Bool
    isCFunctionLabel lbl = case labelType lbl of
    			CodeLabel -> True
    			_other	  -> False

    isGcPtrLabel :: CLabel -> Bool
    isGcPtrLabel lbl = case labelType lbl of
    			GcPtrLabel -> True
    			_other	   -> False

    -- | Work out the general type of data at the address of this label
    --    whether it be code, data, or static GC object.
    labelType :: CLabel -> CLabelType
    labelType (CmmLabel _ _ CmmData)		= DataLabel
    labelType (CmmLabel _ _ CmmGcPtr)		= GcPtrLabel
    labelType (CmmLabel _ _ CmmCode)		= CodeLabel
    labelType (CmmLabel _ _ CmmInfo)		= DataLabel
    labelType (CmmLabel _ _ CmmEntry)		= CodeLabel
    labelType (CmmLabel _ _ CmmRetInfo)		= DataLabel
    labelType (CmmLabel _ _ CmmRet)			= CodeLabel
    labelType (RtsLabel (RtsSelectorInfoTable _ _)) = DataLabel
    labelType (RtsLabel (RtsApInfoTable _ _))       = DataLabel
    labelType (RtsLabel (RtsApFast _))              = CodeLabel
    labelType (CaseLabel _ CaseReturnInfo)          = DataLabel
    labelType (CaseLabel _ _)	                = CodeLabel
    labelType (ModuleInitLabel _ _)                 = CodeLabel
    labelType (PlainModuleInitLabel _)              = CodeLabel
    labelType (ModuleInitTableLabel _)              = DataLabel
    labelType (LargeSRTLabel _)                     = DataLabel
    labelType (LargeBitmapLabel _)                  = DataLabel
    labelType (ForeignLabel _ _ _ IsFunction)	= CodeLabel
    labelType (IdLabel _ _ info)                    = idInfoLabelType info
    labelType _                                     = DataLabel

    idInfoLabelType info =
      case info of
        InfoTable  	  -> DataLabel
        Closure    	  -> GcPtrLabel
        ConInfoTable  -> DataLabel
        StaticInfoTable -> DataLabel
        ClosureTable  -> DataLabel
        RednCounts    -> DataLabel
        _	          -> CodeLabel

    -- -----------------------------------------------------------------------------
    -- Does a CLabel need dynamic linkage?

    -- When referring to data in code, we need to know whether
    -- that data resides in a DLL or not. [Win32 only.]
    -- @labelDynamic@ returns @True@ if the label is located
    -- in a DLL, be it a data reference or not.

    labelDynamic :: PackageId -> CLabel -> Bool
    labelDynamic this_pkg lbl =
      case lbl of
       -- is the RTS in a DLL or not?
       RtsLabel _  	     	-> not opt_Static && (this_pkg /= rtsPackageId)

       IdLabel n _ k     	-> isDllName this_pkg n

    #if mingw32_TARGET_OS
       -- When compiling in the "dyn" way, eack package is to be linked into its own shared library.
       CmmLabel pkg _ _
        -> not opt_Static && (this_pkg /= pkg)

       -- Foreign label is in some un-named foreign package (or DLL)
       ForeignLabel _ _ ForeignLabelInExternalPackage _  -> True

       -- Foreign label is linked into the same package as the source file currently being compiled.
       ForeignLabel _ _ ForeignLabelInThisPackage  _     -> False

       -- Foreign label is in some named package.
       --	When compiling in the "dyn" way, each package is to be linked into its own DLL.
       ForeignLabel _ _ (ForeignLabelInPackage pkgId) _
        -> (not opt_Static) && (this_pkg /= pkgId)

    #else
       -- On Mac OS X and on ELF platforms, false positives are OK,
       -- so we claim that all foreign imports come from dynamic libraries
       ForeignLabel _ _ _ _ -> True

       CmmLabel pkg _ _     -> True

    #endif
       ModuleInitLabel m _    -> not opt_Static && this_pkg /= (modulePackageId m)
       PlainModuleInitLabel m -> not opt_Static && this_pkg /= (modulePackageId m)
       ModuleInitTableLabel m -> not opt_Static && this_pkg /= (modulePackageId m)

       -- Note that DynamicLinkerLabels do NOT require dynamic linking themselves.
       _ 		     -> False

    {-
    OLD?: These GRAN functions are needed for spitting out GRAN_FETCH() at the
    right places. It is used to detect when the abstractC statement of an
    CCodeBlock actually contains the code for a slow entry point.  -- HWL

    We need at least @Eq@ for @CLabels@, because we want to avoid
    duplicate declarations in generating C (see @labelSeenTE@ in
    @PprAbsC@).
    -}

    -----------------------------------------------------------------------------
    -- Printing out CLabels.

    {-
    Convention:

          <name>_<type>

    where <name> is <Module>_<name> for external names and <unique> for
    internal names. <type> is one of the following:

    	 info			Info table
    	 srt			Static reference table
    	 srtd			Static reference table descriptor
    	 entry			Entry code (function, closure)
    	 slow			Slow entry code (if any)
    	 ret			Direct return address
    	 vtbl			Vector table
    	 <n>_alt		Case alternative (tag n)
    	 dflt			Default case alternative
    	 btm			Large bitmap vector
    	 closure		Static closure
    	 con_entry		Dynamic Constructor entry code
    	 con_info		Dynamic Constructor info table
    	 static_entry		Static Constructor entry code
    	 static_info		Static Constructor info table
    	 sel_info		Selector info table
    	 sel_entry		Selector entry code
    	 cc			Cost centre
    	 ccs			Cost centre stack

    Many of these distinctions are only for documentation reasons.  For
    example, _ret is only distinguished from _entry to make it easy to
    tell whether a code fragment is a return point or a closure/function
    entry.
    -}

    instance Outputable CLabel where
      ppr = pprCLabel

    pprCLabel :: CLabel -> SDoc

    #if ! OMIT_NATIVE_CODEGEN
    pprCLabel (AsmTempLabel u)
      =  getPprStyle $ \ sty ->
         if asmStyle sty then
    	ptext asmTempLabelPrefix <> pprUnique u
         else
    	char '_' <> pprUnique u

    pprCLabel (DynamicLinkerLabel info lbl)
       = pprDynamicLinkerAsmLabel info lbl

    pprCLabel PicBaseLabel
       = ptext (sLit "1b")

    pprCLabel (DeadStripPreventer lbl)
       = pprCLabel lbl <> ptext (sLit "_dsp")
    #endif

    pprCLabel lbl =
    #if ! OMIT_NATIVE_CODEGEN
        getPprStyle $ \ sty ->
        if asmStyle sty then
    	maybe_underscore (pprAsmCLbl lbl)
        else
    #endif
           pprCLbl lbl

    maybe_underscore doc
      | underscorePrefix = pp_cSEP <> doc
      | otherwise        = doc

    #ifdef mingw32_TARGET_OS
    -- In asm mode, we need to put the suffix on a stdcall ForeignLabel.
    -- (The C compiler does this itself).
    pprAsmCLbl (ForeignLabel fs (Just sz) _ _)
       = ftext fs <> char '@' <> int sz
    #endif
    pprAsmCLbl lbl
       = pprCLbl lbl

    pprCLbl (StringLitLabel u)
      = pprUnique u <> ptext (sLit "_str")

    pprCLbl (CaseLabel u CaseReturnPt)
      = hcat [pprUnique u, ptext (sLit "_ret")]
    pprCLbl (CaseLabel u CaseReturnInfo)
      = hcat [pprUnique u, ptext (sLit "_info")]
    pprCLbl (CaseLabel u (CaseAlt tag))
      = hcat [pprUnique u, pp_cSEP, int tag, ptext (sLit "_alt")]
    pprCLbl (CaseLabel u CaseDefault)
      = hcat [pprUnique u, ptext (sLit "_dflt")]

    pprCLbl (LargeSRTLabel u)  = pprUnique u <> pp_cSEP <> ptext (sLit "srtd")
    pprCLbl (LargeBitmapLabel u)  = text "b" <> pprUnique u <> pp_cSEP <> ptext (sLit "btm")
    -- Some bitsmaps for tuple constructors have a numeric tag (e.g. '7')
    -- until that gets resolved we'll just force them to start
    -- with a letter so the label will be legal assmbly code.

    pprCLbl (CmmLabel _ str CmmCode)	= ftext str
    pprCLbl (CmmLabel _ str CmmData)	= ftext str
    pprCLbl (CmmLabel _ str CmmGcPtr)	= ftext str
    pprCLbl (CmmLabel _ str CmmPrimCall)	= ftext str

    pprCLbl (RtsLabel (RtsApFast str))   = ftext str <> ptext (sLit "_fast")

    pprCLbl (RtsLabel (RtsSelectorInfoTable upd_reqd offset))
      = hcat [ptext (sLit "stg_sel_"), text (show offset),
    		ptext (if upd_reqd
    			then (sLit "_upd_info")
    			else (sLit "_noupd_info"))
    	]

    pprCLbl (RtsLabel (RtsSelectorEntry upd_reqd offset))
      = hcat [ptext (sLit "stg_sel_"), text (show offset),
    		ptext (if upd_reqd
    			then (sLit "_upd_entry")
    			else (sLit "_noupd_entry"))
    	]

    pprCLbl (RtsLabel (RtsApInfoTable upd_reqd arity))
      = hcat [ptext (sLit "stg_ap_"), text (show arity),
    		ptext (if upd_reqd
    			then (sLit "_upd_info")
    			else (sLit "_noupd_info"))
    	]

    pprCLbl (RtsLabel (RtsApEntry upd_reqd arity))
      = hcat [ptext (sLit "stg_ap_"), text (show arity),
    		ptext (if upd_reqd
    			then (sLit "_upd_entry")
    			else (sLit "_noupd_entry"))
    	]

    pprCLbl (CmmLabel _ fs CmmInfo)
      = ftext fs <> ptext (sLit "_info")

    pprCLbl (CmmLabel _ fs CmmEntry)
      = ftext fs <> ptext (sLit "_entry")

    pprCLbl (CmmLabel _ fs CmmRetInfo)
      = ftext fs <> ptext (sLit "_info")

    pprCLbl (CmmLabel _ fs CmmRet)
      = ftext fs <> ptext (sLit "_ret")

    pprCLbl (RtsLabel (RtsPrimOp primop))
      = ptext (sLit "stg_") <> ppr primop

    pprCLbl (RtsLabel (RtsSlowTickyCtr pat))
      = ptext (sLit "SLOW_CALL_") <> text pat <> ptext (sLit "_ctr")

    pprCLbl ModuleRegdLabel
      = ptext (sLit "_module_registered")

    pprCLbl (ForeignLabel str _ _ _)
      = ftext str

    pprCLbl (IdLabel name cafs flavor) = ppr name <> ppIdFlavor flavor

    pprCLbl (CC_Label cc) 		= ppr cc
    pprCLbl (CCS_Label ccs) 	= ppr ccs

    pprCLbl (ModuleInitLabel mod way)
       = ptext (sLit "__stginit_") <> ppr mod
    	<> char '_' <> text way

    pprCLbl (PlainModuleInitLabel mod)
       = ptext (sLit "__stginit_") <> ppr mod

    pprCLbl (ModuleInitTableLabel mod)
       = ptext (sLit "__stginittable_") <> ppr mod

    pprCLbl (HpcTicksLabel mod)
      = ptext (sLit "_hpc_tickboxes_")  <> ppr mod <> ptext (sLit "_hpc")

    pprCLbl HpcModuleNameLabel
      = ptext (sLit "_hpc_module_name_str")

    ppIdFlavor :: IdLabelInfo -> SDoc
    ppIdFlavor x = pp_cSEP <>
    	       (case x of
    		       Closure	    	-> ptext (sLit "closure")
    		       SRT		-> ptext (sLit "srt")
    		       InfoTable    	-> ptext (sLit "info")
    		       Entry	    	-> ptext (sLit "entry")
    		       Slow	    	-> ptext (sLit "slow")
    		       RednCounts	-> ptext (sLit "ct")
    		       ConEntry	    	-> ptext (sLit "con_entry")
    		       ConInfoTable    	-> ptext (sLit "con_info")
    		       StaticConEntry  	-> ptext (sLit "static_entry")
    		       StaticInfoTable 	-> ptext (sLit "static_info")
    		       ClosureTable     -> ptext (sLit "closure_tbl")
    		      )

    pp_cSEP = char '_'

    instance Outputable ForeignLabelSource where
     ppr fs
      = case fs of
      	ForeignLabelInPackage pkgId	-> parens $ text "package: " <> ppr pkgId
    	ForeignLabelInThisPackage	-> parens $ text "this package"
    	ForeignLabelInExternalPackage	-> parens $ text "external package"

    -- -----------------------------------------------------------------------------
    -- Machine-dependent knowledge about labels.

    underscorePrefix :: Bool   -- leading underscore on assembler labels?
    underscorePrefix = (cLeadingUnderscore == "YES")

    asmTempLabelPrefix :: LitString  -- for formatting labels
    asmTempLabelPrefix =
    #if alpha_TARGET_OS
         {- The alpha assembler likes temporary labels to look like $L123
    	instead of L123.  (Don't toss the L, because then Lf28
    	turns into $f28.)
         -}
         (sLit "$")
    #elif darwin_TARGET_OS
         (sLit "L")
    #else
         (sLit ".L")
    #endif

    pprDynamicLinkerAsmLabel :: DynamicLinkerLabelInfo -> CLabel -> SDoc

    #if x86_64_TARGET_ARCH && darwin_TARGET_OS
    pprDynamicLinkerAsmLabel CodeStub lbl
      = char 'L' <> pprCLabel lbl <> text "$stub"
    pprDynamicLinkerAsmLabel SymbolPtr lbl
      = char 'L' <> pprCLabel lbl <> text "$non_lazy_ptr"
    pprDynamicLinkerAsmLabel GotSymbolPtr lbl
      = pprCLabel lbl <> text "@GOTPCREL"
    pprDynamicLinkerAsmLabel GotSymbolOffset lbl
      = pprCLabel lbl
    pprDynamicLinkerAsmLabel _ _
      = panic "pprDynamicLinkerAsmLabel"

    #elif darwin_TARGET_OS
    pprDynamicLinkerAsmLabel CodeStub lbl
      = char 'L' <> pprCLabel lbl <> text "$stub"
    pprDynamicLinkerAsmLabel SymbolPtr lbl
      = char 'L' <> pprCLabel lbl <> text "$non_lazy_ptr"
    pprDynamicLinkerAsmLabel _ _
      = panic "pprDynamicLinkerAsmLabel"

    #elif powerpc_TARGET_ARCH && elf_OBJ_FORMAT
    pprDynamicLinkerAsmLabel CodeStub lbl
      = pprCLabel lbl <> text "@plt"
    pprDynamicLinkerAsmLabel SymbolPtr lbl
      = text ".LC_" <> pprCLabel lbl
    pprDynamicLinkerAsmLabel _ _
      = panic "pprDynamicLinkerAsmLabel"

    #elif x86_64_TARGET_ARCH && elf_OBJ_FORMAT
    pprDynamicLinkerAsmLabel CodeStub lbl
      = pprCLabel lbl <> text "@plt"
    pprDynamicLinkerAsmLabel GotSymbolPtr lbl
      = pprCLabel lbl <> text "@gotpcrel"
    pprDynamicLinkerAsmLabel GotSymbolOffset lbl
      = pprCLabel lbl
    pprDynamicLinkerAsmLabel SymbolPtr lbl
      = text ".LC_" <> pprCLabel lbl

    #elif elf_OBJ_FORMAT
    pprDynamicLinkerAsmLabel CodeStub lbl
      = pprCLabel lbl <> text "@plt"
    pprDynamicLinkerAsmLabel SymbolPtr lbl
      = text ".LC_" <> pprCLabel lbl
    pprDynamicLinkerAsmLabel GotSymbolPtr lbl
      = pprCLabel lbl <> text "@got"
    pprDynamicLinkerAsmLabel GotSymbolOffset lbl
      = pprCLabel lbl <> text "@gotoff"

    #elif mingw32_TARGET_OS
    pprDynamicLinkerAsmLabel SymbolPtr lbl
      = text "__imp_" <> pprCLabel lbl
    pprDynamicLinkerAsmLabel _ _
      = panic "pprDynamicLinkerAsmLabel"

    #else
    pprDynamicLinkerAsmLabel _ _
      = panic "pprDynamicLinkerAsmLabel"
    #endif