ghc-9.12.3: GHC/Cmm/CLabel.hs
{-# LANGUAGE LambdaCase #-}
-----------------------------------------------------------------------------
--
-- Object-file symbols (called CLabel for historical reasons).
--
-- (c) The University of Glasgow 2004-2006
--
-----------------------------------------------------------------------------
module GHC.Cmm.CLabel (
CLabel, -- abstract type
NeedExternDecl (..),
ForeignLabelSource(..),
DynamicLinkerLabelInfo(..),
ConInfoTableLocation(..),
getConInfoTableLocation,
-- * Constructors
mkClosureLabel,
mkSRTLabel,
mkInfoTableLabel,
mkEntryLabel,
mkRednCountsLabel,
mkTagHitLabel,
mkConInfoTableLabel,
mkApEntryLabel,
mkApInfoTableLabel,
mkClosureTableLabel,
mkBytesLabel,
mkLocalBlockLabel,
mkBlockInfoTableLabel,
mkBitmapLabel,
mkStringLitLabel,
mkInitializerStubLabel,
mkInitializerArrayLabel,
mkFinalizerStubLabel,
mkFinalizerArrayLabel,
mkAsmTempLabel,
mkAsmTempDerivedLabel,
mkAsmTempEndLabel,
mkAsmTempProcEndLabel,
mkAsmTempDieLabel,
mkDirty_MUT_VAR_Label,
mkMUT_VAR_CLEAN_infoLabel,
mkNonmovingWriteBarrierEnabledLabel,
mkOrigThunkInfoLabel,
mkUpdInfoLabel,
mkBHUpdInfoLabel,
mkIndStaticInfoLabel,
mkMainCapabilityLabel,
mkMAP_FROZEN_CLEAN_infoLabel,
mkMAP_FROZEN_DIRTY_infoLabel,
mkMAP_DIRTY_infoLabel,
mkSMAP_FROZEN_CLEAN_infoLabel,
mkSMAP_FROZEN_DIRTY_infoLabel,
mkSMAP_DIRTY_infoLabel,
mkBadAlignmentLabel,
mkOutOfBoundsAccessLabel,
mkMemcpyRangeOverlapLabel,
mkArrWords_infoLabel,
mkSRTInfoLabel,
mkTopTickyCtrLabel,
mkCAFBlackHoleInfoTableLabel,
mkRtsPrimOpLabel,
mkRtsSlowFastTickyCtrLabel,
mkRtsUnpackCStringLabel,
mkRtsUnpackCStringUtf8Label,
mkSelectorInfoLabel,
mkSelectorEntryLabel,
mkCmmInfoLabel,
mkCmmEntryLabel,
mkCmmRetInfoLabel,
mkCmmRetLabel,
mkCmmCodeLabel,
mkCmmDataLabel,
mkRtsCmmDataLabel,
mkCmmClosureLabel,
mkRtsApFastLabel,
mkPrimCallLabel,
mkForeignLabel,
mkCCLabel,
mkCCSLabel,
mkIPELabel,
InfoProvEnt(..),
mkDynamicLinkerLabel,
mkPicBaseLabel,
mkDeadStripPreventer,
mkHpcTicksLabel,
-- * Predicates
hasCAF,
needsCDecl,
maybeLocalBlockLabel,
externallyVisibleCLabel,
isLibcFun,
isCFunctionLabel,
isGcPtrLabel,
labelDynamic,
isLocalCLabel,
mayRedirectTo,
isInfoTableLabel,
isCmmInfoTableLabel,
isConInfoTableLabel,
isIdLabel,
isTickyLabel,
hasHaskellName,
hasIdLabelInfo,
isBytesLabel,
isForeignLabel,
isSomeRODataLabel,
isStaticClosureLabel,
-- * Conversions
toClosureLbl,
toSlowEntryLbl,
toEntryLbl,
toInfoLbl,
toProcDelimiterLbl,
-- * Pretty-printing
LabelStyle (..),
pprDebugCLabel,
pprCLabel,
pprAsmLabel,
ppInternalProcLabel,
-- * Others
dynamicLinkerLabelInfo,
CStubLabel (..),
cStubLabel,
fromCStubLabel,
mapInternalNonDetUniques
) where
import GHC.Prelude
import GHC.Types.Id.Info
import GHC.Types.Basic
import {-# SOURCE #-} GHC.Cmm.BlockId (BlockId, mkBlockId)
import GHC.Unit.Types
import GHC.Types.Name
import GHC.Types.Unique
import GHC.Builtin.PrimOps
import GHC.Types.CostCentre
import GHC.Utils.Outputable
import GHC.Utils.Panic
import GHC.Data.FastString
import GHC.Platform
import GHC.Types.Unique.Set
import GHC.Core.Ppr ( {- instances -} )
import GHC.Types.SrcLoc
import qualified Data.Semigroup as S
-- -----------------------------------------------------------------------------
-- 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.
CLabel usage is a bit messy in GHC as they are used in a number of different
contexts:
- By the C-- AST to identify labels
- By the unregisterised C code generator (\"PprC\") for naming functions (hence
the name 'CLabel')
- By the native and LLVM code generators to identify labels
For extra fun, each of these uses a slightly different subset of constructors
(e.g. 'AsmTempLabel' and 'AsmTempDerivedLabel' are used only in the NCG and
LLVM backends).
In general, we use 'IdLabel' to represent Haskell things early in the
pipeline. However, later optimization passes will often represent blocks they
create with 'LocalBlockLabel' where there is no obvious 'Name' to hang off the
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
UnitId -- ^ what package the label belongs to.
NeedExternDecl -- ^ does the label need an "extern .." declaration
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 UnitId argument.
| RtsLabel
RtsLabelInfo
-- | A label associated with a block. These aren't visible outside of the
-- compilation unit in which they are defined. These are generally used to
-- name blocks produced by Cmm-to-Cmm passes and the native code generator,
-- where we don't have a 'Name' to associate the label to and therefore can't
-- use 'IdLabel'.
| LocalBlockLabel
{-# UNPACK #-} !Unique
-- | A 'C' (or otherwise foreign) label.
--
| ForeignLabel
FastString -- ^ name of the imported label.
ForeignLabelSource -- ^ what package the foreign label is in.
FunctionOrData
-- | Local temporary label used for native (or LLVM) code generation; must not
-- appear outside of these contexts. Use primarily for debug information
| AsmTempLabel
{-# UNPACK #-} !Unique
-- | A label \"derived\" from another 'CLabel' by the addition of a suffix.
-- Must not occur outside of the NCG or LLVM code generators.
| AsmTempDerivedLabel
CLabel
FastString -- ^ suffix
| StringLitLabel
{-# UNPACK #-} !Unique
| CC_Label CostCentre
| CCS_Label CostCentreStack
| IPE_Label InfoProvEnt
-- | A per-module metadata label.
| ModuleLabel !Module ModuleLabelKind
-- | These labels are generated and used inside the NCG only.
-- They are special variants of a label used for dynamic linking
-- see module "GHC.CmmToAsm.PIC" 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
-- | Static reference table
| SRTLabel
{-# UNPACK #-} !Unique
-- | A bitmap (function or case return)
| LargeBitmapLabel
{-# UNPACK #-} !Unique
deriving Eq
instance Show CLabel where
show = showPprUnsafe . pprDebugCLabel genericPlatform
data ModuleLabelKind
= MLK_Initializer LexicalFastString
| MLK_InitializerArray
| MLK_Finalizer LexicalFastString
| MLK_FinalizerArray
| MLK_IPEBuffer
deriving (Eq, Ord)
pprModuleLabelKind :: IsLine doc => ModuleLabelKind -> doc
pprModuleLabelKind MLK_InitializerArray = text "init_arr"
pprModuleLabelKind (MLK_Initializer (LexicalFastString s)) = text "init__" <> ftext s
pprModuleLabelKind MLK_FinalizerArray = text "fini_arr"
pprModuleLabelKind (MLK_Finalizer (LexicalFastString s)) = text "fini__" <> ftext s
pprModuleLabelKind MLK_IPEBuffer = text "ipe_buf"
{-# SPECIALIZE pprModuleLabelKind :: ModuleLabelKind -> SDoc #-}
{-# SPECIALIZE pprModuleLabelKind :: ModuleLabelKind -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable
isIdLabel :: CLabel -> Bool
isIdLabel IdLabel{} = True
isIdLabel _ = False
-- Used in SRT analysis. See Note [Ticky labels in SRT analysis] in
-- GHC.Cmm.Info.Build.
isTickyLabel :: CLabel -> Bool
isTickyLabel (IdLabel _ _ IdTickyInfo{}) = True
isTickyLabel _ = False
-- | Indicate if "GHC.CmmToC" has to generate an extern declaration for the
-- label (e.g. "extern StgWordArray(foo)"). The type is fixed to StgWordArray.
--
-- Symbols from the RTS don't need "extern" declarations because they are
-- exposed via "rts/include/Stg.h" with the appropriate type. See 'needsCDecl'.
--
-- The fixed StgWordArray type led to "conflicting types" issues with user
-- provided Cmm files (not in the RTS) that declare data of another type (#15467
-- and test for #17920). Hence the Cmm parser considers that labels in data
-- sections don't need the "extern" declaration (just add one explicitly if you
-- need it).
--
-- See https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/compiler/backends/ppr-c#prototypes
-- for why extern declaration are needed at all.
newtype NeedExternDecl
= NeedExternDecl Bool
deriving (Ord,Eq)
-- This is laborious, but necessary. We can't derive Ord because
-- Unique has a special Ord instance that cares for object determinism.
-- Note nonDetCmpUnique and stableNameCmp in the implementation:
-- * If -fobject-determinism, the internal uniques will be renamed, thus the
-- comparison will actually be deterministic
-- * Stable name compare guarantees deterministic ordering of Names despite
-- the non-deterministic uniques underlying external names (which aren't
-- renamed on -fobject-determinism).
-- See Note [Unique Determinism and code generation] and Note [Object determinism]
instance Ord CLabel where
compare (IdLabel a1 b1 c1)
(IdLabel a2 b2 c2)
| isExternalName a1, isExternalName a2 = stableNameCmp a1 a2 S.<> compare b1 b2 S.<> compare c1 c2
| isExternalName a1 = GT
| isExternalName a2 = LT
compare (IdLabel a1 b1 c1) (IdLabel a2 b2 c2) =
-- Comparing names here should deterministic because all unique should have
-- been renamed deterministically, and external names compared above.
compare a1 a2 S.<>
compare b1 b2 S.<>
compare c1 c2
compare (CmmLabel a1 b1 c1 d1) (CmmLabel a2 b2 c2 d2) =
compare a1 a2 S.<>
compare b1 b2 S.<>
-- This is not non-deterministic because the uniques have been deterministically renamed.
-- See Note [Object determinism]
uniqCompareFS c1 c2 S.<>
compare d1 d2
compare (RtsLabel a1) (RtsLabel a2) = compare a1 a2
compare (LocalBlockLabel u1) (LocalBlockLabel u2) = nonDetCmpUnique u1 u2
compare (ForeignLabel a1 b1 c1) (ForeignLabel a2 b2 c2) =
uniqCompareFS a1 a2 S.<>
compare b1 b2 S.<>
compare c1 c2
compare (AsmTempLabel u1) (AsmTempLabel u2) = nonDetCmpUnique u1 u2
compare (AsmTempDerivedLabel a1 b1) (AsmTempDerivedLabel a2 b2) =
compare a1 a2 S.<>
lexicalCompareFS b1 b2
compare (StringLitLabel u1) (StringLitLabel u2) =
nonDetCmpUnique u1 u2
compare (CC_Label a1) (CC_Label a2) =
compare a1 a2
compare (CCS_Label a1) (CCS_Label a2) =
compare a1 a2
compare (IPE_Label a1) (IPE_Label a2) =
compare a1 a2
compare (ModuleLabel m1 k1) (ModuleLabel m2 k2) =
compare m1 m2 S.<>
compare k1 k2
compare (DynamicLinkerLabel a1 b1) (DynamicLinkerLabel a2 b2) =
compare a1 a2 S.<>
compare b1 b2
compare PicBaseLabel PicBaseLabel = EQ
compare (DeadStripPreventer a1) (DeadStripPreventer a2) =
compare a1 a2
compare (HpcTicksLabel a1) (HpcTicksLabel a2) =
compare a1 a2
compare (SRTLabel u1) (SRTLabel u2) =
nonDetCmpUnique u1 u2
compare (LargeBitmapLabel u1) (LargeBitmapLabel u2) =
nonDetCmpUnique u1 u2
compare IdLabel{} _ = LT
compare _ IdLabel{} = GT
compare CmmLabel{} _ = LT
compare _ CmmLabel{} = GT
compare RtsLabel{} _ = LT
compare _ RtsLabel{} = GT
compare LocalBlockLabel{} _ = LT
compare _ LocalBlockLabel{} = GT
compare ForeignLabel{} _ = LT
compare _ ForeignLabel{} = GT
compare AsmTempLabel{} _ = LT
compare _ AsmTempLabel{} = GT
compare AsmTempDerivedLabel{} _ = LT
compare _ AsmTempDerivedLabel{} = GT
compare StringLitLabel{} _ = LT
compare _ StringLitLabel{} = GT
compare CC_Label{} _ = LT
compare _ CC_Label{} = GT
compare CCS_Label{} _ = LT
compare _ CCS_Label{} = GT
compare DynamicLinkerLabel{} _ = LT
compare _ DynamicLinkerLabel{} = GT
compare PicBaseLabel{} _ = LT
compare _ PicBaseLabel{} = GT
compare DeadStripPreventer{} _ = LT
compare _ DeadStripPreventer{} = GT
compare HpcTicksLabel{} _ = LT
compare _ HpcTicksLabel{} = GT
compare SRTLabel{} _ = LT
compare _ SRTLabel{} = GT
compare (IPE_Label {}) _ = LT
compare _ (IPE_Label{}) = GT
compare (ModuleLabel {}) _ = LT
compare _ (ModuleLabel{}) = GT
-- | Record where a foreign label is stored.
data ForeignLabelSource
-- | Label is in a named package
= ForeignLabelInPackage UnitId
-- | 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 currently 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 :: Platform -> CLabel -> SDoc
pprDebugCLabel platform lbl = pprAsmLabel platform lbl <> parens extra
where
extra = case lbl of
IdLabel _ _ info
-> text "IdLabel" <> whenPprDebug (text ":" <> ppr info)
CmmLabel pkg _ext _name _info
-> text "CmmLabel" <+> ppr pkg
RtsLabel{}
-> text "RtsLabel"
ForeignLabel _name src funOrData
-> text "ForeignLabel" <+> ppr src <+> ppr funOrData
_ -> text "other CLabel"
-- Dynamic ticky info for the id.
data TickyIdInfo
= TickyRednCounts -- ^ Used for dynamic allocations
| TickyInferedTag !Unique -- ^ Used to track dynamic hits of tag inference.
deriving (Eq,Show)
instance Outputable TickyIdInfo where
ppr TickyRednCounts = text "ct_rdn"
ppr (TickyInferedTag unique) = text "ct_tag[" <> ppr unique <> char ']'
-- | Don't depend on this if you need determinism.
-- No determinism in the ncg backend, so we use the unique for Ord.
-- Even if it pains me slightly.
instance Ord TickyIdInfo where
compare TickyRednCounts TickyRednCounts = EQ
compare TickyRednCounts _ = LT
compare _ TickyRednCounts = GT
compare (TickyInferedTag unique1) (TickyInferedTag unique2) =
nonDetCmpUnique unique1 unique2
data IdLabelInfo
= Closure -- ^ Label for closure
| InfoTable -- ^ Info tables for closures; always read-only
| Entry -- ^ Entry point
| Slow -- ^ Slow entry point
| LocalInfoTable -- ^ Like InfoTable but not externally visible
| LocalEntry -- ^ Like Entry but not externally visible
| IdTickyInfo !TickyIdInfo -- ^ Label of place to keep Ticky-ticky hit info for this Id
| ConEntry ConInfoTableLocation
-- ^ Constructor entry point, when `-fdistinct-info-tables` is enabled then
-- each usage of a constructor will be given a unique number and a fresh info
-- table will be created in the module where the constructor is used. The
-- argument is used to keep track of which info table a usage of a constructor
-- should use. When the argument is 'Nothing' then it uses the info table which
-- is defined in the module where the datatype is declared, this is the usual case.
-- When it is (Just (m, k)) it will use the kth info table defined in module m. The
-- point of this inefficiency is so that you can work out where allocations of data
-- constructors are coming from when you are debugging.
| ConInfoTable ConInfoTableLocation -- ^ Corresponding info table
| ClosureTable -- ^ Table of closures for Enum tycons
| Bytes -- ^ Content of a string literal. See
-- Note [Bytes label].
| BlockInfoTable -- ^ Like LocalInfoTable but for a proc-point block
-- instead of a closure entry-point.
-- See Note [Proc-point local block entry-points].
deriving (Eq, Ord)
-- | Which module is the info table from, and which number was it.
data ConInfoTableLocation = UsageSite Module Int
| DefinitionSite
deriving (Eq, Ord)
instance Outputable ConInfoTableLocation where
ppr (UsageSite m n) = text "Loc(" <> ppr n <> text "):" <+> ppr m
ppr DefinitionSite = empty
getConInfoTableLocation :: IdLabelInfo -> Maybe ConInfoTableLocation
getConInfoTableLocation (ConInfoTable ci) = Just ci
getConInfoTableLocation _ = Nothing
instance Outputable IdLabelInfo where
ppr Closure = text "Closure"
ppr InfoTable = text "InfoTable"
ppr Entry = text "Entry"
ppr Slow = text "Slow"
ppr LocalInfoTable = text "LocalInfoTable"
ppr LocalEntry = text "LocalEntry"
ppr (ConEntry mn) = text "ConEntry" <+> ppr mn
ppr (ConInfoTable mn) = text "ConInfoTable" <+> ppr mn
ppr ClosureTable = text "ClosureTable"
ppr Bytes = text "Bytes"
ppr BlockInfoTable = text "BlockInfoTable"
ppr (IdTickyInfo info) = text "IdTickyInfo" <+> ppr info
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-}
| RtsUnpackCStringInfoTable
| RtsUnpackCStringUtf8InfoTable
| RtsPrimOp PrimOp
| RtsApFast NonDetFastString -- ^ _fast versions of generic apply
| RtsSlowFastTickyCtr String
deriving (Eq,Ord)
-- | 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 tables, 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
| CmmClosure -- ^ closures 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 :: Unique -> CLabel
mkSRTLabel u = SRTLabel u
-- See Note [ticky for LNE]
mkRednCountsLabel :: Name -> CLabel
mkRednCountsLabel name = IdLabel name NoCafRefs (IdTickyInfo TickyRednCounts)
mkTagHitLabel :: Name -> Unique -> CLabel
mkTagHitLabel name !uniq = IdLabel name NoCafRefs (IdTickyInfo (TickyInferedTag uniq))
mkClosureLabel :: Name -> CafInfo -> CLabel
mkInfoTableLabel :: Name -> CafInfo -> CLabel
mkEntryLabel :: Name -> CafInfo -> CLabel
mkClosureTableLabel :: Name -> CafInfo -> CLabel
mkConInfoTableLabel :: Name -> ConInfoTableLocation -> CLabel
mkBytesLabel :: Name -> CLabel
mkClosureLabel name c = IdLabel name c Closure
-- | Decides between external and local labels based on the names externality.
mkInfoTableLabel name c
| isExternalName name = IdLabel name c InfoTable
| otherwise = IdLabel name c LocalInfoTable
mkEntryLabel name c = IdLabel name c Entry
mkClosureTableLabel name c = IdLabel name c ClosureTable
-- Special case for the normal 'DefinitionSite' case so that the 'ConInfoTable' application can be floated to a CAF.
mkConInfoTableLabel name DefinitionSite = IdLabel name NoCafRefs (ConInfoTable DefinitionSite)
mkConInfoTableLabel name k = IdLabel name NoCafRefs (ConInfoTable k)
mkBytesLabel name = IdLabel name NoCafRefs Bytes
mkBlockInfoTableLabel :: Name -> CafInfo -> CLabel
mkBlockInfoTableLabel name c = IdLabel name c BlockInfoTable
-- See Note [Proc-point local block entry-points].
-- Constructing Cmm Labels
mkDirty_MUT_VAR_Label,
mkNonmovingWriteBarrierEnabledLabel,
mkOrigThunkInfoLabel, mkUpdInfoLabel,
mkBHUpdInfoLabel, mkIndStaticInfoLabel, mkMainCapabilityLabel,
mkMAP_FROZEN_CLEAN_infoLabel, mkMAP_FROZEN_DIRTY_infoLabel,
mkMAP_DIRTY_infoLabel,
mkArrWords_infoLabel,
mkTopTickyCtrLabel,
mkCAFBlackHoleInfoTableLabel,
mkSMAP_FROZEN_CLEAN_infoLabel, mkSMAP_FROZEN_DIRTY_infoLabel,
mkSMAP_DIRTY_infoLabel, mkBadAlignmentLabel,
mkOutOfBoundsAccessLabel, mkMemcpyRangeOverlapLabel,
mkMUT_VAR_CLEAN_infoLabel :: CLabel
mkDirty_MUT_VAR_Label = mkForeignLabel (fsLit "dirty_MUT_VAR") ForeignLabelInExternalPackage IsFunction
mkNonmovingWriteBarrierEnabledLabel
= CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "nonmoving_write_barrier_enabled") CmmData
mkOrigThunkInfoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_orig_thunk_info_frame") CmmInfo
mkUpdInfoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_upd_frame") CmmInfo
mkBHUpdInfoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_bh_upd_frame" ) CmmInfo
mkIndStaticInfoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_IND_STATIC") CmmInfo
mkMainCapabilityLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "MainCapability") CmmData
mkMAP_FROZEN_CLEAN_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_MUT_ARR_PTRS_FROZEN_CLEAN") CmmInfo
mkMAP_FROZEN_DIRTY_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_MUT_ARR_PTRS_FROZEN_DIRTY") CmmInfo
mkMAP_DIRTY_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_MUT_ARR_PTRS_DIRTY") CmmInfo
mkTopTickyCtrLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "top_ct") CmmData
mkCAFBlackHoleInfoTableLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_CAF_BLACKHOLE") CmmInfo
mkArrWords_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_ARR_WORDS") CmmInfo
mkSMAP_FROZEN_CLEAN_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_SMALL_MUT_ARR_PTRS_FROZEN_CLEAN") CmmInfo
mkSMAP_FROZEN_DIRTY_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_SMALL_MUT_ARR_PTRS_FROZEN_DIRTY") CmmInfo
mkSMAP_DIRTY_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_SMALL_MUT_ARR_PTRS_DIRTY") CmmInfo
mkBadAlignmentLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_badAlignment") CmmEntry
mkOutOfBoundsAccessLabel = mkForeignLabel (fsLit "rtsOutOfBoundsAccess") ForeignLabelInExternalPackage IsFunction
mkMemcpyRangeOverlapLabel = mkForeignLabel (fsLit "rtsMemcpyRangeOverlap") ForeignLabelInExternalPackage IsFunction
mkMUT_VAR_CLEAN_infoLabel = CmmLabel rtsUnitId (NeedExternDecl False) (fsLit "stg_MUT_VAR_CLEAN") CmmInfo
mkSRTInfoLabel :: Int -> CLabel
mkSRTInfoLabel n = CmmLabel rtsUnitId (NeedExternDecl False) lbl CmmInfo
where
lbl =
case n of
1 -> fsLit "stg_SRT_1"
2 -> fsLit "stg_SRT_2"
3 -> fsLit "stg_SRT_3"
4 -> fsLit "stg_SRT_4"
5 -> fsLit "stg_SRT_5"
6 -> fsLit "stg_SRT_6"
7 -> fsLit "stg_SRT_7"
8 -> fsLit "stg_SRT_8"
9 -> fsLit "stg_SRT_9"
10 -> fsLit "stg_SRT_10"
11 -> fsLit "stg_SRT_11"
12 -> fsLit "stg_SRT_12"
13 -> fsLit "stg_SRT_13"
14 -> fsLit "stg_SRT_14"
15 -> fsLit "stg_SRT_15"
16 -> fsLit "stg_SRT_16"
_ -> panic "mkSRTInfoLabel"
-----
mkCmmInfoLabel, mkCmmEntryLabel, mkCmmRetInfoLabel, mkCmmRetLabel,
mkCmmCodeLabel, mkCmmClosureLabel
:: UnitId -> FastString -> CLabel
mkCmmDataLabel :: UnitId -> NeedExternDecl -> FastString -> CLabel
mkRtsCmmDataLabel :: FastString -> CLabel
mkCmmInfoLabel pkg str = CmmLabel pkg (NeedExternDecl True) str CmmInfo
mkCmmEntryLabel pkg str = CmmLabel pkg (NeedExternDecl True) str CmmEntry
mkCmmRetInfoLabel pkg str = CmmLabel pkg (NeedExternDecl True) str CmmRetInfo
mkCmmRetLabel pkg str = CmmLabel pkg (NeedExternDecl True) str CmmRet
mkCmmCodeLabel pkg str = CmmLabel pkg (NeedExternDecl True) str CmmCode
mkCmmClosureLabel pkg str = CmmLabel pkg (NeedExternDecl True) str CmmClosure
mkCmmDataLabel pkg ext str = CmmLabel pkg ext str CmmData
mkRtsCmmDataLabel str = CmmLabel rtsUnitId (NeedExternDecl False) str CmmData
-- RTS symbols don't need "GHC.CmmToC" to
-- generate \"extern\" declaration (they are
-- exposed via rts/include/Stg.h)
mkLocalBlockLabel :: Unique -> CLabel
mkLocalBlockLabel u = LocalBlockLabel u
-- Constructing RtsLabels
mkRtsPrimOpLabel :: PrimOp -> CLabel
mkRtsPrimOpLabel primop = RtsLabel (RtsPrimOp primop)
mkSelectorInfoLabel :: Platform -> Bool -> Int -> CLabel
mkSelectorInfoLabel platform upd offset =
assert (offset >= 0 && offset <= pc_MAX_SPEC_SELECTEE_SIZE (platformConstants platform)) $
RtsLabel (RtsSelectorInfoTable upd offset)
mkSelectorEntryLabel :: Platform -> Bool -> Int -> CLabel
mkSelectorEntryLabel platform upd offset =
assert (offset >= 0 && offset <= pc_MAX_SPEC_SELECTEE_SIZE (platformConstants platform)) $
RtsLabel (RtsSelectorEntry upd offset)
mkApInfoTableLabel :: Platform -> Bool -> Int -> CLabel
mkApInfoTableLabel platform upd arity =
assert (arity > 0 && arity <= pc_MAX_SPEC_AP_SIZE (platformConstants platform)) $
RtsLabel (RtsApInfoTable upd arity)
mkApEntryLabel :: Platform -> Bool -> Int -> CLabel
mkApEntryLabel platform upd arity =
assert (arity > 0 && arity <= pc_MAX_SPEC_AP_SIZE (platformConstants platform)) $
RtsLabel (RtsApEntry upd arity)
-- A call to some primitive hand written Cmm code
mkPrimCallLabel :: PrimCall -> CLabel
mkPrimCallLabel (PrimCall str pkg)
= CmmLabel (toUnitId pkg) (NeedExternDecl True) str CmmPrimCall
-- Constructing ForeignLabels
-- | Make a foreign label
mkForeignLabel
:: FastString -- name
-> ForeignLabelSource -- what package it's in
-> FunctionOrData
-> CLabel
mkForeignLabel = ForeignLabel
-- | Whether label is a top-level string literal
isBytesLabel :: CLabel -> Bool
isBytesLabel (IdLabel _ _ Bytes) = True
isBytesLabel _lbl = False
-- | Whether label is a non-haskell label (defined in C code)
isForeignLabel :: CLabel -> Bool
isForeignLabel (ForeignLabel _ _ _) = True
isForeignLabel _lbl = False
-- | Whether label is a static closure label (can come from haskell or cmm)
isStaticClosureLabel :: CLabel -> Bool
-- Closure defined in haskell (.hs)
isStaticClosureLabel (IdLabel _ _ Closure) = True
-- Closure defined in cmm
isStaticClosureLabel (CmmLabel _ _ _ CmmClosure) = True
isStaticClosureLabel _lbl = False
-- | Whether label is a .rodata label
isSomeRODataLabel :: CLabel -> Bool
-- info table defined in haskell (.hs)
isSomeRODataLabel (IdLabel _ _ ClosureTable) = True
isSomeRODataLabel (IdLabel _ _ ConInfoTable {}) = True
isSomeRODataLabel (IdLabel _ _ InfoTable) = True
isSomeRODataLabel (IdLabel _ _ LocalInfoTable) = True
isSomeRODataLabel (IdLabel _ _ BlockInfoTable) = True
-- info table defined in cmm (.cmm)
isSomeRODataLabel (CmmLabel _ _ _ CmmInfo) = True
isSomeRODataLabel (CmmLabel _ _ _ CmmRetInfo) = True
isSomeRODataLabel _lbl = False
-- | Whether label is points to some kind of info table
isInfoTableLabel :: CLabel -> Bool
isInfoTableLabel (IdLabel _ _ InfoTable) = True
isInfoTableLabel (IdLabel _ _ LocalInfoTable) = True
isInfoTableLabel (IdLabel _ _ ConInfoTable {}) = True
isInfoTableLabel (IdLabel _ _ BlockInfoTable) = True
isInfoTableLabel (CmmLabel _ _ _ CmmInfo) = True
isInfoTableLabel _ = False
-- | Whether label points to an info table defined in Cmm
isCmmInfoTableLabel :: CLabel -> Bool
isCmmInfoTableLabel (CmmLabel _ _ _ CmmInfo) = True
isCmmInfoTableLabel _ = False
-- | Whether label is points to constructor info table
isConInfoTableLabel :: CLabel -> Bool
isConInfoTableLabel (IdLabel _ _ ConInfoTable {}) = True
isConInfoTableLabel _ = False
-- Constructing Large*Labels
mkBitmapLabel :: Unique -> CLabel
mkBitmapLabel uniq = LargeBitmapLabel uniq
-- | Info Table Provenance Entry
-- See Note [Mapping Info Tables to Source Positions]
data InfoProvEnt = InfoProvEnt
{ infoTablePtr :: !CLabel
-- Address of the info table
, infoProvEntClosureType :: !Int
-- The closure type of the info table (from ClosureMacros.h)
, infoTableType :: !String
-- The rendered Haskell type of the closure the table represents
, infoProvModule :: !Module
-- Origin module
, infoTableProv :: !(Maybe (RealSrcSpan, LexicalFastString)) }
-- Position and information about the info table
deriving (Eq, Ord)
instance OutputableP Platform InfoProvEnt where
pdoc platform (InfoProvEnt clabel _ _ _ _) = pdoc platform clabel
-- Constructing Cost Center Labels
mkCCLabel :: CostCentre -> CLabel
mkCCSLabel :: CostCentreStack -> CLabel
mkIPELabel :: Module -> CLabel
mkCCLabel cc = CC_Label cc
mkCCSLabel ccs = CCS_Label ccs
mkIPELabel mod = ModuleLabel mod MLK_IPEBuffer
mkRtsApFastLabel :: FastString -> CLabel
mkRtsApFastLabel str = RtsLabel (RtsApFast (NonDetFastString str))
mkRtsSlowFastTickyCtrLabel :: String -> CLabel
mkRtsSlowFastTickyCtrLabel pat = RtsLabel (RtsSlowFastTickyCtr pat)
-- | A standard string unpacking thunk. See Note [unpack_cstring closures] in
-- StgStdThunks.cmm.
mkRtsUnpackCStringLabel, mkRtsUnpackCStringUtf8Label :: CLabel
mkRtsUnpackCStringLabel = RtsLabel RtsUnpackCStringInfoTable
mkRtsUnpackCStringUtf8Label = RtsLabel RtsUnpackCStringUtf8InfoTable
-- Constructing Code Coverage Labels
mkHpcTicksLabel :: Module -> CLabel
mkHpcTicksLabel = HpcTicksLabel
-- 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
mkInitializerStubLabel :: Module -> FastString -> CLabel
mkInitializerStubLabel mod s = ModuleLabel mod (MLK_Initializer (LexicalFastString s))
mkInitializerArrayLabel :: Module -> CLabel
mkInitializerArrayLabel mod = ModuleLabel mod MLK_InitializerArray
mkFinalizerStubLabel :: Module -> FastString -> CLabel
mkFinalizerStubLabel mod s = ModuleLabel mod (MLK_Finalizer (LexicalFastString s))
mkFinalizerArrayLabel :: Module -> CLabel
mkFinalizerArrayLabel mod = ModuleLabel mod MLK_FinalizerArray
mkAsmTempLabel :: Uniquable a => a -> CLabel
mkAsmTempLabel a = AsmTempLabel (getUnique a)
mkAsmTempDerivedLabel :: CLabel -> FastString -> CLabel
mkAsmTempDerivedLabel = AsmTempDerivedLabel
mkAsmTempEndLabel :: CLabel -> CLabel
mkAsmTempEndLabel l = mkAsmTempDerivedLabel l (fsLit "_end")
-- | A label indicating the end of a procedure.
mkAsmTempProcEndLabel :: CLabel -> CLabel
mkAsmTempProcEndLabel l = mkAsmTempDerivedLabel l (fsLit "_proc_end")
-- | Construct a label for a DWARF Debug Information Entity (DIE)
-- describing another symbol.
mkAsmTempDieLabel :: CLabel -> CLabel
mkAsmTempDieLabel l = mkAsmTempDerivedLabel l (fsLit "_die")
-- -----------------------------------------------------------------------------
-- Convert between different kinds of label
toClosureLbl :: Platform -> CLabel -> CLabel
toClosureLbl platform lbl = case lbl of
IdLabel n c _ -> IdLabel n c Closure
CmmLabel m ext str _ -> CmmLabel m ext str CmmClosure
_ -> pprPanic "toClosureLbl" (pprDebugCLabel platform lbl)
toSlowEntryLbl :: Platform -> CLabel -> CLabel
toSlowEntryLbl platform lbl = case lbl of
IdLabel n _ BlockInfoTable -> pprPanic "toSlowEntryLbl" (ppr n)
IdLabel n c _ -> IdLabel n c Slow
_ -> pprPanic "toSlowEntryLbl" (pprDebugCLabel platform lbl)
toEntryLbl :: Platform -> CLabel -> CLabel
toEntryLbl platform lbl = case lbl of
IdLabel n c LocalInfoTable -> IdLabel n c LocalEntry
IdLabel n c (ConInfoTable k) -> IdLabel n c (ConEntry k)
IdLabel n _ BlockInfoTable -> mkLocalBlockLabel (nameUnique n)
-- See Note [Proc-point local block entry-points].
IdLabel n c _ -> IdLabel n c Entry
CmmLabel m ext str CmmInfo -> CmmLabel m ext str CmmEntry
CmmLabel m ext str CmmRetInfo -> CmmLabel m ext str CmmRet
_ -> pprPanic "toEntryLbl" (pprDebugCLabel platform lbl)
-- | Generate a CmmProc delimiter label from the actual entry label.
--
-- This delimiter label might be the entry label itself, except when the entry
-- label is a LocalBlockLabel. If we reused the entry label to delimit the proc,
-- we would generate redundant labels (see #22792)
toProcDelimiterLbl :: CLabel -> CLabel
toProcDelimiterLbl lbl = case lbl of
LocalBlockLabel {} -> mkAsmTempDerivedLabel lbl (fsLit "_entry")
_ -> lbl
toInfoLbl :: Platform -> CLabel -> CLabel
toInfoLbl platform lbl = case lbl of
IdLabel n c LocalEntry -> IdLabel n c LocalInfoTable
IdLabel n c (ConEntry k) -> IdLabel n c (ConInfoTable k)
IdLabel n c _ -> IdLabel n c InfoTable
CmmLabel m ext str CmmEntry -> CmmLabel m ext str CmmInfo
CmmLabel m ext str CmmRet -> CmmLabel m ext str CmmRetInfo
_ -> pprPanic "CLabel.toInfoLbl" (pprDebugCLabel platform lbl)
hasHaskellName :: CLabel -> Maybe Name
hasHaskellName (IdLabel n _ _) = Just n
hasHaskellName _ = Nothing
hasIdLabelInfo :: CLabel -> Maybe IdLabelInfo
hasIdLabelInfo (IdLabel _ _ l) = Just l
hasIdLabelInfo _ = Nothing
-- -----------------------------------------------------------------------------
-- Does a CLabel's referent itself refer to a CAF?
hasCAF :: CLabel -> Bool
hasCAF (IdLabel _ _ (IdTickyInfo TickyRednCounts)) = False -- See Note [ticky for LNE]
hasCAF (IdLabel _ MayHaveCafRefs _) = True
hasCAF (RtsLabel RtsUnpackCStringInfoTable) = True
hasCAF (RtsLabel RtsUnpackCStringUtf8InfoTable) = True
-- The info table stg_MK_STRING_info is for thunks
hasCAF _ = False
-- Note [ticky for LNE]
-- ~~~~~~~~~~~~~~~~~~~~~
-- Until 14 Feb 2013, every ticky counter was associated with a
-- closure. Thus, ticky labels used IdLabel. It is odd that
-- GHC.Cmm.Info.Build.cafTransfers would consider such a ticky label
-- reason to add the name to the CAFEnv (and thus eventually the SRT),
-- but it was harmless because the ticky was only used if the closure
-- was also.
--
-- Since we now have ticky counters for LNEs, it is no longer the case
-- that every ticky counter has an actual closure. So I changed the
-- generation of ticky counters' CLabels to not result in their
-- associated id ending up in the SRT.
--
-- NB IdLabel is still appropriate for ticky ids (as opposed to
-- CmmLabel) because the LNE's counter is still related to an .hs Id,
-- that Id just isn't for a proper closure.
-- -----------------------------------------------------------------------------
-- Does a CLabel need declaring before use or not?
--
-- See wiki:commentary/compiler/backends/ppr-c#prototypes
needsCDecl :: CLabel -> Bool
-- False <=> it's pre-declared; don't bother
-- don't bother declaring Bitmap labels, we always make sure
-- they are defined before use.
needsCDecl (SRTLabel _) = True
needsCDecl (LargeBitmapLabel _) = False
needsCDecl (IdLabel _ _ _) = True
needsCDecl (LocalBlockLabel _) = True
needsCDecl (StringLitLabel _) = False
needsCDecl (AsmTempLabel _) = False
needsCDecl (AsmTempDerivedLabel _ _) = False
needsCDecl (RtsLabel _) = False
needsCDecl (CmmLabel pkgId (NeedExternDecl external) _ _)
-- local labels mustn't have it
| not external = False
-- Prototypes for labels defined in the runtime system are imported
-- into HC files via rts/include/Stg.h.
| pkgId == rtsUnitId = False
-- For other labels we inline one into the HC file directly.
| otherwise = True
needsCDecl l@(ForeignLabel{}) = not (isLibcFun l)
needsCDecl (CC_Label _) = True
needsCDecl (CCS_Label _) = True
needsCDecl (IPE_Label {}) = True
needsCDecl (ModuleLabel _ kind) = modLabelNeedsCDecl kind
needsCDecl (HpcTicksLabel _) = True
needsCDecl (DynamicLinkerLabel {}) = panic "needsCDecl DynamicLinkerLabel"
needsCDecl PicBaseLabel = panic "needsCDecl PicBaseLabel"
needsCDecl (DeadStripPreventer {}) = panic "needsCDecl DeadStripPreventer"
modLabelNeedsCDecl :: ModuleLabelKind -> Bool
-- Code for finalizers and initializers are emitted in stub objects
modLabelNeedsCDecl (MLK_Initializer _) = True
modLabelNeedsCDecl (MLK_Finalizer _) = True
modLabelNeedsCDecl MLK_IPEBuffer = True
-- The finalizer and initializer arrays are emitted in the code of the module
modLabelNeedsCDecl MLK_InitializerArray = False
modLabelNeedsCDecl MLK_FinalizerArray = False
-- | If a label is a local block label then return just its 'BlockId', otherwise
-- 'Nothing'.
maybeLocalBlockLabel :: CLabel -> Maybe BlockId
maybeLocalBlockLabel (LocalBlockLabel uq) = Just $ mkBlockId uq
maybeLocalBlockLabel _ = Nothing
-- | Check whether a label corresponds to a C function that has
-- a prototype in a system header somewhere, or is built-in
-- to the C compiler. For these labels we avoid generating our
-- own C prototypes.
isLibcFun :: CLabel -> Bool
isLibcFun (ForeignLabel fs _ _) = fs `elementOfUniqSet` libc_funs
isLibcFun _ = False
libc_funs :: UniqSet FastString
libc_funs = mkUniqSet [
---------------------
-- Math functions
---------------------
-- _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"),
-- These functions are described in IEEE Std 754-2008 -
-- Standard for Floating-Point Arithmetic and ISO/IEC TS 18661
(fsLit "nextup"), (fsLit "nextupf"), (fsLit "nextupl"),
(fsLit "nextdown"), (fsLit "nextdownf"), (fsLit "nextdownl")
]
-- -----------------------------------------------------------------------------
-- | 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 (StringLitLabel _) = False
externallyVisibleCLabel (AsmTempLabel _) = False
externallyVisibleCLabel (AsmTempDerivedLabel _ _)= False
externallyVisibleCLabel (RtsLabel _) = True
externallyVisibleCLabel (LocalBlockLabel _) = False
externallyVisibleCLabel (CmmLabel _ _ _ _) = True
externallyVisibleCLabel (ForeignLabel{}) = True
externallyVisibleCLabel (IdLabel name _ info) = isExternalName name && externallyVisibleIdLabel info
externallyVisibleCLabel (CC_Label _) = True
externallyVisibleCLabel (CCS_Label _) = True
externallyVisibleCLabel (IPE_Label {}) = True
externallyVisibleCLabel (ModuleLabel {}) = True
externallyVisibleCLabel (DynamicLinkerLabel _ _) = False
externallyVisibleCLabel (HpcTicksLabel _) = True
externallyVisibleCLabel (LargeBitmapLabel _) = False
externallyVisibleCLabel (SRTLabel _) = False
externallyVisibleCLabel (PicBaseLabel {}) = panic "externallyVisibleCLabel PicBaseLabel"
externallyVisibleCLabel (DeadStripPreventer {}) = panic "externallyVisibleCLabel DeadStripPreventer"
externallyVisibleIdLabel :: IdLabelInfo -> Bool
externallyVisibleIdLabel LocalInfoTable = False
externallyVisibleIdLabel LocalEntry = False
externallyVisibleIdLabel BlockInfoTable = False
externallyVisibleIdLabel _ = True
-- -----------------------------------------------------------------------------
-- 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 (IdLabel _ _ info) = idInfoLabelType info
labelType (CmmLabel _ _ _ CmmData) = DataLabel
labelType (CmmLabel _ _ _ CmmClosure) = GcPtrLabel
labelType (CmmLabel _ _ _ CmmCode) = CodeLabel
labelType (CmmLabel _ _ _ CmmInfo) = DataLabel
labelType (CmmLabel _ _ _ CmmEntry) = CodeLabel
labelType (CmmLabel _ _ _ CmmPrimCall) = CodeLabel
labelType (CmmLabel _ _ _ CmmRetInfo) = DataLabel
labelType (CmmLabel _ _ _ CmmRet) = CodeLabel
labelType (RtsLabel (RtsSelectorInfoTable _ _)) = DataLabel
labelType (RtsLabel (RtsSelectorEntry _ _)) = CodeLabel
labelType (RtsLabel (RtsApInfoTable _ _)) = DataLabel
labelType (RtsLabel (RtsApEntry _ _)) = CodeLabel
labelType (RtsLabel (RtsApFast _)) = CodeLabel
labelType (RtsLabel RtsUnpackCStringInfoTable) = DataLabel
labelType (RtsLabel RtsUnpackCStringUtf8InfoTable)
= DataLabel
labelType (RtsLabel (RtsPrimOp _)) = CodeLabel
labelType (RtsLabel (RtsSlowFastTickyCtr _)) = DataLabel
labelType (LocalBlockLabel _) = CodeLabel
labelType (SRTLabel _) = DataLabel
labelType (ForeignLabel _ _ IsFunction) = CodeLabel
labelType (ForeignLabel _ _ IsData) = DataLabel
labelType (AsmTempLabel _) = panic "labelType(AsmTempLabel)"
labelType (AsmTempDerivedLabel _ _) = panic "labelType(AsmTempDerivedLabel)"
labelType (StringLitLabel _) = DataLabel
labelType (CC_Label _) = DataLabel
labelType (CCS_Label _) = DataLabel
labelType (IPE_Label {}) = DataLabel
labelType (ModuleLabel _ kind) = moduleLabelKindType kind
labelType (DynamicLinkerLabel _ _) = DataLabel -- Is this right?
labelType PicBaseLabel = DataLabel
labelType (DeadStripPreventer _) = DataLabel
labelType (HpcTicksLabel _) = DataLabel
labelType (LargeBitmapLabel _) = DataLabel
moduleLabelKindType :: ModuleLabelKind -> CLabelType
moduleLabelKindType kind =
case kind of
MLK_Initializer _ -> CodeLabel
MLK_InitializerArray -> DataLabel
MLK_Finalizer _ -> CodeLabel
MLK_FinalizerArray -> DataLabel
MLK_IPEBuffer -> DataLabel
idInfoLabelType :: IdLabelInfo -> CLabelType
idInfoLabelType info =
case info of
InfoTable -> DataLabel
LocalInfoTable -> DataLabel
BlockInfoTable -> DataLabel
Closure -> GcPtrLabel
ConInfoTable {} -> DataLabel
ClosureTable -> DataLabel
IdTickyInfo{} -> DataLabel
Bytes -> DataLabel
_ -> CodeLabel
-- -----------------------------------------------------------------------------
-- | Is a 'CLabel' defined in the current module being compiled?
--
-- Sometimes we can optimise references within a compilation unit in ways that
-- we couldn't for inter-module references. This provides a conservative
-- estimate of whether a 'CLabel' lives in the current module.
isLocalCLabel :: Module -> CLabel -> Bool
isLocalCLabel this_mod lbl =
case lbl of
IdLabel name _ _
| isInternalName name -> True
| otherwise -> nameModule name == this_mod
LocalBlockLabel _ -> True
_ -> False
-- -----------------------------------------------------------------------------
-- | 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 :: Module -> Platform -> Bool -> CLabel -> Bool
labelDynamic this_mod platform external_dynamic_refs lbl =
case lbl of
-- is the RTS in a DLL or not?
RtsLabel _ ->
external_dynamic_refs && (this_unit /= rtsUnitId)
IdLabel n _ _ ->
external_dynamic_refs && isDynLinkName platform this_mod n
-- When compiling in the "dyn" way, each package is to be linked into
-- its own shared library.
CmmLabel lbl_unit _ _ _
| os == OSMinGW32 -> external_dynamic_refs && (this_unit /= lbl_unit)
| otherwise -> external_dynamic_refs
LocalBlockLabel _ -> False
ForeignLabel _ source _ ->
if os == OSMinGW32
then case source of
-- Foreign label is in some un-named foreign package (or DLL).
ForeignLabelInExternalPackage -> True
-- Foreign label is linked into the same package as the
-- source file currently being compiled.
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.
ForeignLabelInPackage pkgId ->
external_dynamic_refs && (this_unit /= 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
True
CC_Label cc ->
external_dynamic_refs && not (ccFromThisModule cc this_mod)
-- CCS_Label always contains a CostCentre defined in the current module
CCS_Label _ -> False
IPE_Label {} -> True
HpcTicksLabel m ->
external_dynamic_refs && this_mod /= m
-- Note that DynamicLinkerLabels do NOT require dynamic linking themselves.
_ -> False
where
os = platformOS platform
this_unit = toUnitId (moduleUnit this_mod)
-----------------------------------------------------------------------------
-- 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
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.
Note [Closure and info labels]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For a function 'foo, we have:
foo_info : Points to the info table describing foo's closure
(and entry code for foo with tables next to code)
foo_closure : Static (no-free-var) closure only:
points to the statically-allocated closure
For a data constructor (such as Just or Nothing), we have:
Just_con_info: Info table for the data constructor itself
the first word of a heap-allocated Just
Just_info: Info table for the *worker function*, an
ordinary Haskell function of arity 1 that
allocates a (Just x) box:
Just = \x -> Just x
Just_entry: The entry code for the worker function
Just_closure: The closure for this worker
Nothing_closure: a statically allocated closure for Nothing
Nothing_static_info: info table for Nothing_closure
All these must be exported symbol, EXCEPT Just_info. We don't need to
export this because in other modules we either have
* A reference to 'Just'; use Just_closure
* A saturated call 'Just x'; allocate using Just_con_info
Not exporting these Just_info labels reduces the number of symbols
somewhat.
Note [Bytes label]
~~~~~~~~~~~~~~~~~~
For a top-level string literal 'foo', we have just one symbol 'foo_bytes', which
points to a static data block containing the content of the literal.
Note [Proc-point local block entry-points]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A label for a proc-point local block entry-point has no "_entry" suffix. With
`infoTblLbl` we derive an info table label from a proc-point block ID. If
we convert such an info table label into an entry label we must produce
the label without an "_entry" suffix. So an info table label records
the fact that it was derived from a block ID in `IdLabelInfo` as
`BlockInfoTable`.
The info table label and the local block label are both local labels
and are not externally visible.
Note [Bangs in CLabel]
~~~~~~~~~~~~~~~~~~~~~~
There are some carefully placed strictness annotations in this module,
which were discovered in !5226 to significantly reduce compile-time
allocation. Take care if you want to remove them!
-}
-- | Style of label pretty-printing.
--
-- When we produce C sources or headers, we have to take into account
-- that C compilers transform C labels when they convert them into
-- symbols. For example, they can add prefixes (e.g., "_" on Darwin).
-- So we provide two ways to pretty-print CLabels: C style or Asm
-- style.
--
data LabelStyle
= CStyle -- ^ C label style (used by C and LLVM backends)
| AsmStyle -- ^ Asm label style (used by NCG backend)
pprAsmLabel :: IsLine doc => Platform -> CLabel -> doc
pprAsmLabel platform lbl = pprCLabelStyle platform AsmStyle lbl
{-# SPECIALIZE pprAsmLabel :: Platform -> CLabel -> SDoc #-}
{-# SPECIALIZE pprAsmLabel :: Platform -> CLabel -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable
pprCLabel :: IsLine doc => Platform -> CLabel -> doc
pprCLabel platform lbl = pprCLabelStyle platform CStyle lbl
{-# SPECIALIZE pprCLabel :: Platform -> CLabel -> SDoc #-}
{-# SPECIALIZE pprCLabel :: Platform -> CLabel -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable
instance OutputableP Platform CLabel where
{-# INLINE pdoc #-} -- see Note [Bangs in CLabel]
pdoc !platform lbl = getPprStyle $ \pp_sty ->
case pp_sty of
PprDump{} -> pprCLabel platform lbl
_ -> let lbl_doc = (pprCLabel platform lbl)
in pprTraceUserWarning (text "Labels in code should be printed with pprCLabel or pprAsmLabel" <> lbl_doc) lbl_doc
pprCLabelStyle :: forall doc. IsLine doc => Platform -> LabelStyle -> CLabel -> doc
pprCLabelStyle !platform !sty lbl = -- see Note [Bangs in CLabel]
let
!use_leading_underscores = platformLeadingUnderscore platform
-- some platform (e.g. Darwin) require a leading "_" for exported asm
-- symbols
maybe_underscore :: doc -> doc
maybe_underscore doc = case sty of
AsmStyle | use_leading_underscores -> pp_cSEP <> doc
_ -> doc
tempLabelPrefixOrUnderscore :: doc
tempLabelPrefixOrUnderscore = case sty of
AsmStyle -> asmTempLabelPrefix platform
CStyle -> char '_'
in case lbl of
LocalBlockLabel u -> case sty of
AsmStyle -> tempLabelPrefixOrUnderscore <> pprUniqueAlways u
CStyle -> tempLabelPrefixOrUnderscore <> text "blk_" <> pprUniqueAlways u
AsmTempLabel u
-> tempLabelPrefixOrUnderscore <> pprUniqueAlways u
AsmTempDerivedLabel l suf
-- we print a derived label, so we just print the parent label
-- recursively. However we don't want to print the temp prefix (e.g.
-- ".L") twice, so we must explicitely handle these cases.
-> let skipTempPrefix = \case
AsmTempLabel u -> pprUniqueAlways u
AsmTempDerivedLabel l suf -> skipTempPrefix l <> ftext suf
LocalBlockLabel u -> pprUniqueAlways u
lbl -> pprAsmLabel platform lbl
in
asmTempLabelPrefix platform
<> skipTempPrefix l
<> ftext suf
DynamicLinkerLabel info lbl
-> pprDynamicLinkerAsmLabel platform info (pprAsmLabel platform lbl)
PicBaseLabel
-> text "1b"
DeadStripPreventer lbl
->
{-
`lbl` can be temp one but we need to ensure that dsp label will stay
in the final binary so we prepend non-temp prefix ("dsp_") and
optional `_` (underscore) because this is how you mark non-temp symbols
on some platforms (Darwin)
-}
maybe_underscore $ text "dsp_" <> pprCLabelStyle platform sty lbl <> text "_dsp"
StringLitLabel u
-> maybe_underscore $ pprUniqueAlways u <> text "_str"
ForeignLabel fs _ _
-> maybe_underscore $ ftext fs
IdLabel name _cafs flavor -> case sty of
AsmStyle -> maybe_underscore $ internalNamePrefix <> pprName name <> ppIdFlavor flavor
where
isRandomGenerated = not (isExternalName name)
internalNamePrefix =
if isRandomGenerated
then asmTempLabelPrefix platform
else empty
CStyle -> pprName name <> ppIdFlavor flavor
SRTLabel u
-> maybe_underscore $ tempLabelPrefixOrUnderscore <> pprUniqueAlways u <> pp_cSEP <> text "srt"
RtsLabel (RtsApFast (NonDetFastString str))
-> maybe_underscore $ ftext str <> text "_fast"
RtsLabel (RtsSelectorInfoTable upd_reqd offset)
-> maybe_underscore $ hcat [ text "stg_sel_", int offset
, if upd_reqd
then text "_upd_info"
else text "_noupd_info"
]
RtsLabel (RtsSelectorEntry upd_reqd offset)
-> maybe_underscore $ hcat [ text "stg_sel_", int offset
, if upd_reqd
then text "_upd_entry"
else text "_noupd_entry"
]
RtsLabel (RtsApInfoTable upd_reqd arity)
-> maybe_underscore $ hcat [ text "stg_ap_", int arity
, if upd_reqd
then text "_upd_info"
else text "_noupd_info"
]
RtsLabel (RtsApEntry upd_reqd arity)
-> maybe_underscore $ hcat [ text "stg_ap_", int arity
, if upd_reqd
then text "_upd_entry"
else text "_noupd_entry"
]
RtsLabel (RtsPrimOp primop)
-> maybe_underscore $ text "stg_" <> pprPrimOp primop
RtsLabel (RtsSlowFastTickyCtr pat)
-> maybe_underscore $ text "SLOW_CALL_fast_" <> text pat <> text "_ctr"
RtsLabel RtsUnpackCStringInfoTable
-> maybe_underscore $ text "stg_unpack_cstring_info"
RtsLabel RtsUnpackCStringUtf8InfoTable
-> maybe_underscore $ text "stg_unpack_cstring_utf8_info"
LargeBitmapLabel u
-> maybe_underscore $ tempLabelPrefixOrUnderscore
<> char 'b' <> pprUniqueAlways u <> pp_cSEP <> text "btm"
-- Some bitmaps 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 assembly code.
HpcTicksLabel mod
-> maybe_underscore $ text "_hpc_tickboxes_" <> pprModule mod <> text "_hpc"
CC_Label cc -> maybe_underscore $ pprCostCentre cc
CCS_Label ccs -> maybe_underscore $ pprCostCentreStack ccs
IPE_Label (InfoProvEnt l _ _ m _) -> maybe_underscore $ (pprCLabel platform l <> text "_" <> pprModule m <> text "_ipe")
ModuleLabel mod kind -> maybe_underscore $ pprModule mod <> text "_" <> pprModuleLabelKind kind
CmmLabel _ _ fs CmmCode -> maybe_underscore $ ftext fs
CmmLabel _ _ fs CmmData -> maybe_underscore $ ftext fs
CmmLabel _ _ fs CmmPrimCall -> maybe_underscore $ ftext fs
CmmLabel _ _ fs CmmInfo -> maybe_underscore $ ftext fs <> text "_info"
CmmLabel _ _ fs CmmEntry -> maybe_underscore $ ftext fs <> text "_entry"
CmmLabel _ _ fs CmmRetInfo -> maybe_underscore $ ftext fs <> text "_info"
CmmLabel _ _ fs CmmRet -> maybe_underscore $ ftext fs <> text "_ret"
CmmLabel _ _ fs CmmClosure -> maybe_underscore $ ftext fs <> text "_closure"
{-# SPECIALIZE pprCLabelStyle :: Platform -> LabelStyle -> CLabel -> SDoc #-}
{-# SPECIALIZE pprCLabelStyle :: Platform -> LabelStyle -> CLabel -> HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable
-- Note [Internal proc labels]
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- Some tools (e.g. the `perf` utility on Linux) rely on the symbol table
-- for resolution of function names. To help these tools we provide the
-- (enabled by default) -fexpose-all-symbols flag which causes GHC to produce
-- symbols even for symbols with are internal to a module (although such
-- symbols will have only local linkage).
--
-- Note that these labels are *not* referred to by code. They are strictly for
-- diagnostics purposes.
--
-- To avoid confusion, it is desirable to add a module-qualifier to the
-- symbol name. However, the Name type's Internal constructor doesn't carry
-- knowledge of the current Module. Consequently, we have to pass this around
-- explicitly.
-- | Generate a label for a procedure internal to a module (if
-- 'Opt_ExposeAllSymbols' is enabled).
-- See Note [Internal proc labels].
ppInternalProcLabel :: IsLine doc
=> Module -- ^ the current module
-> CLabel
-> Maybe doc -- ^ the internal proc label
ppInternalProcLabel this_mod (IdLabel nm _ flavour)
| isInternalName nm
= Just
$ text "_" <> pprModule this_mod
<> char '_'
<> ztext (zEncodeFS (occNameFS (occName nm)))
<> char '_'
<> pprUniqueAlways (getUnique nm)
<> ppIdFlavor flavour
ppInternalProcLabel _ _ = Nothing
{-# SPECIALIZE ppInternalProcLabel :: Module -> CLabel -> Maybe SDoc #-}
{-# SPECIALIZE ppInternalProcLabel :: Module -> CLabel -> Maybe HLine #-} -- see Note [SPECIALIZE to HDoc] in GHC.Utils.Outputable
ppIdFlavor :: IsLine doc => IdLabelInfo -> doc
ppIdFlavor x = pp_cSEP <> case x of
Closure -> text "closure"
InfoTable -> text "info"
LocalInfoTable -> text "info"
Entry -> text "entry"
LocalEntry -> text "entry"
Slow -> text "slow"
IdTickyInfo TickyRednCounts
-> text "ct"
IdTickyInfo (TickyInferedTag unique)
-> text "ct_inf_tag" <> char '_' <> pprUniqueAlways unique
ConEntry loc ->
case loc of
DefinitionSite -> text "con_entry"
UsageSite m n ->
pprModule m <> pp_cSEP <> int n <> pp_cSEP <> text "con_entry"
ConInfoTable k ->
case k of
DefinitionSite -> text "con_info"
UsageSite m n ->
pprModule m <> pp_cSEP <> int n <> pp_cSEP <> text "con_info"
ClosureTable -> text "closure_tbl"
Bytes -> text "bytes"
BlockInfoTable -> text "info"
pp_cSEP :: IsLine doc => doc
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.
asmTempLabelPrefix :: IsLine doc => Platform -> doc -- for formatting labels
asmTempLabelPrefix !platform = case platformOS platform of
OSDarwin -> text "L"
OSAIX -> text "__L" -- follow IBM XL C's convention
_ -> text ".L"
pprDynamicLinkerAsmLabel :: IsLine doc => Platform -> DynamicLinkerLabelInfo -> doc -> doc
pprDynamicLinkerAsmLabel !platform dllInfo ppLbl =
case platformOS platform of
OSDarwin
| platformArch platform == ArchX86_64 ->
case dllInfo of
CodeStub -> char 'L' <> ppLbl <> text "$stub"
SymbolPtr -> char 'L' <> ppLbl <> text "$non_lazy_ptr"
GotSymbolPtr -> ppLbl <> text "@GOTPCREL"
GotSymbolOffset -> ppLbl
| platformArch platform == ArchAArch64 -> ppLbl
| otherwise -> panic "pprDynamicLinkerAsmLabel"
OSAIX ->
case dllInfo of
SymbolPtr -> text "LC.." <> ppLbl -- GCC's naming convention
_ -> panic "pprDynamicLinkerAsmLabel"
_ | osElfTarget (platformOS platform) -> elfLabel
OSMinGW32 ->
case dllInfo of
SymbolPtr -> text "__imp_" <> ppLbl
_ -> panic "pprDynamicLinkerAsmLabel"
_ -> panic "pprDynamicLinkerAsmLabel"
where
elfLabel
| platformArch platform == ArchPPC
= case dllInfo of
CodeStub -> -- See Note [.LCTOC1 in PPC PIC code]
ppLbl <> text "+32768@plt"
SymbolPtr -> text ".LC_" <> ppLbl
_ -> panic "pprDynamicLinkerAsmLabel"
| platformArch platform == ArchAArch64
= ppLbl
| platformArch platform == ArchRISCV64
= ppLbl
| platformArch platform == ArchX86_64
= case dllInfo of
CodeStub -> ppLbl <> text "@plt"
GotSymbolPtr -> ppLbl <> text "@gotpcrel"
GotSymbolOffset -> ppLbl
SymbolPtr -> text ".LC_" <> ppLbl
| platformArch platform == ArchPPC_64 ELF_V1
|| platformArch platform == ArchPPC_64 ELF_V2
= case dllInfo of
GotSymbolPtr -> text ".LC_" <> ppLbl <> text "@toc"
GotSymbolOffset -> ppLbl
SymbolPtr -> text ".LC_" <> ppLbl
_ -> panic "pprDynamicLinkerAsmLabel"
| otherwise
= case dllInfo of
CodeStub -> ppLbl <> text "@plt"
SymbolPtr -> text ".LC_" <> ppLbl
GotSymbolPtr -> ppLbl <> text "@got"
GotSymbolOffset -> ppLbl <> text "@gotoff"
-- Figure out whether `symbol` may serve as an alias
-- to `target` within one compilation unit.
--
-- This is true if any of these holds:
-- * `target` is a module-internal haskell name.
-- * `target` is an exported name, but comes from the same
-- module as `symbol`
--
-- These are sufficient conditions for establishing e.g. a
-- GNU assembly alias ('.equiv' directive). Sadly, there is
-- no such thing as an alias to an imported symbol (conf.
-- http://blog.omega-prime.co.uk/2011/07/06/the-sad-state-of-symbol-aliases/)
-- See Note [emit-time elimination of static indirections].
--
-- Precondition is that both labels represent the
-- same semantic value.
mayRedirectTo :: CLabel -> CLabel -> Bool
mayRedirectTo symbol target
| Just nam <- haskellName
, staticClosureLabel
, isExternalName nam
, Just mod <- nameModule_maybe nam
, Just anam <- hasHaskellName symbol
, Just amod <- nameModule_maybe anam
= amod == mod
| Just nam <- haskellName
, staticClosureLabel
, isInternalName nam
= True
| otherwise = False
where staticClosureLabel = isStaticClosureLabel target
haskellName = hasHaskellName target
{-
Note [emit-time elimination of static indirections]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
As described in #15155, certain static values are representationally
equivalent, e.g. 'cast'ed values (when created by 'newtype' wrappers).
newtype A = A Int
{-# NOINLINE a #-}
a = A 42
a1_rYB :: Int
[GblId, Caf=NoCafRefs, Unf=OtherCon []]
a1_rYB = GHC.Types.I# 42#
a [InlPrag=NOINLINE] :: A
[GblId, Unf=OtherCon []]
a = a1_rYB `cast` (Sym (T15155.N:A[0]) :: Int ~R# A)
Formerly we created static indirections for these (IND_STATIC), which
consist of a statically allocated forwarding closure that contains
the (possibly tagged) indirectee. (See CMM/assembly below.)
This approach is suboptimal for two reasons:
(a) they occupy extra space,
(b) they need to be entered in order to obtain the indirectee,
thus they cannot be tagged.
Fortunately there is a common case where static indirections can be
eliminated while emitting assembly (native or LLVM), viz. when the
indirectee is in the same module (object file) as the symbol that
points to it. In this case an assembly-level identification can
be created ('.equiv' directive), and as such the same object will
be assigned two names in the symbol table. Any of the identified
symbols can be referenced by a tagged pointer.
Currently the 'mayRedirectTo' predicate will
give a clue whether a label can be equated with another, already
emitted, label (which can in turn be an alias). The general mechanics
is that we identify data (IND_STATIC closures) that are amenable
to aliasing while pretty-printing of assembly output, and emit the
'.equiv' directive instead of static data in such a case.
Here is a sketch how the output is massaged:
Consider
newtype A = A Int
{-# NOINLINE a #-}
a = A 42 -- I# 42# is the indirectee
-- 'a' is exported
results in STG
a1_rXq :: GHC.Types.Int
[GblId, Caf=NoCafRefs, Unf=OtherCon []] =
CCS_DONT_CARE GHC.Types.I#! [42#];
T15155.a [InlPrag=NOINLINE] :: T15155.A
[GblId, Unf=OtherCon []] =
CAF_ccs \ u [] a1_rXq;
and CMM
[section ""data" . a1_rXq_closure" {
a1_rXq_closure:
const GHC.Types.I#_con_info;
const 42;
}]
[section ""data" . T15155.a_closure" {
T15155.a_closure:
const stg_IND_STATIC_info;
const a1_rXq_closure+1;
const 0;
const 0;
}]
The emitted assembly is
==== INDIRECTEE
a1_rXq_closure: -- module local haskell value
.quad GHC.Types.I#_con_info -- an Int
.quad 42
==== BEFORE
.globl T15155.a_closure -- exported newtype wrapped value
T15155.a_closure:
.quad stg_IND_STATIC_info -- the closure info
.quad a1_rXq_closure+1 -- indirectee ('+1' being the tag)
.quad 0
.quad 0
==== AFTER
.globl T15155.a_closure -- exported newtype wrapped value
.equiv a1_rXq_closure,T15155.a_closure -- both are shared
The transformation is performed because
T15155.a_closure `mayRedirectTo` a1_rXq_closure+1
returns True.
-}
-- | This type encodes the subset of 'CLabel' that occurs in C stubs of foreign
-- declarations for the purpose of serializing to interface files.
--
-- See Note [Foreign stubs and TH bytecode linking]
data CStubLabel =
CStubLabel {
csl_is_initializer :: Bool,
csl_module :: Module,
csl_name :: FastString
}
instance Outputable CStubLabel where
ppr CStubLabel {csl_is_initializer, csl_module, csl_name} =
text ini <+> ppr csl_module <> colon <> text (unpackFS csl_name)
where
ini = if csl_is_initializer then "initializer" else "finalizer"
-- | Project the constructor 'ModuleLabel' out of 'CLabel' if it is an
-- initializer or finalizer.
cStubLabel :: CLabel -> Maybe CStubLabel
cStubLabel = \case
ModuleLabel csl_module label_kind -> do
(csl_is_initializer, csl_name) <- case label_kind of
MLK_Initializer (LexicalFastString s) -> Just (True, s)
MLK_Finalizer (LexicalFastString s) -> Just (False, s)
_ -> Nothing
Just (CStubLabel {csl_is_initializer, csl_module, csl_name})
_ -> Nothing
-- | Inject a 'CStubLabel' into a 'CLabel' as a 'ModuleLabel'.
fromCStubLabel :: CStubLabel -> CLabel
fromCStubLabel (CStubLabel {csl_is_initializer, csl_module, csl_name}) =
ModuleLabel csl_module (label_kind (LexicalFastString csl_name))
where
label_kind =
if csl_is_initializer
then MLK_Initializer
else MLK_Finalizer
-- | A utility for renaming uniques in CLabels to produce deterministic object.
-- Note that not all Uniques are mapped over. Only those that can be safely alpha
-- renamed, e.g. uniques of local symbols, but not of external ones.
-- See Note [Renaming uniques deterministically].
mapInternalNonDetUniques :: Applicative m => (Unique -> m Unique) -> CLabel -> m CLabel
-- todo: Can we do less work here, e.g., do we really need to rename AsmTempLabel, LocalBlockLabel?
mapInternalNonDetUniques f x = case x of
IdLabel name cafInfo idLabelInfo
| not (isExternalName name) -> IdLabel . setNameUnique name <$> f (nameUnique name) <*> pure cafInfo <*> pure idLabelInfo
| otherwise -> pure x
cl@CmmLabel{} -> pure cl
RtsLabel rtsLblInfo -> pure $ RtsLabel rtsLblInfo
LocalBlockLabel unique -> LocalBlockLabel <$> f unique
fl@ForeignLabel{} -> pure fl
AsmTempLabel unique -> AsmTempLabel <$> f unique
AsmTempDerivedLabel clbl fs -> AsmTempDerivedLabel <$> mapInternalNonDetUniques f clbl <*> pure fs
StringLitLabel unique -> StringLitLabel <$> f unique
CC_Label cc -> pure $ CC_Label cc
CCS_Label ccs -> pure $ CCS_Label ccs
IPE_Label ipe@InfoProvEnt{infoTablePtr} ->
(\cl' -> IPE_Label ipe{infoTablePtr = cl'}) <$> mapInternalNonDetUniques f infoTablePtr
ml@ModuleLabel{} -> pure ml
DynamicLinkerLabel dlli clbl -> DynamicLinkerLabel dlli <$> mapInternalNonDetUniques f clbl
PicBaseLabel -> pure PicBaseLabel
DeadStripPreventer clbl -> DeadStripPreventer <$> mapInternalNonDetUniques f clbl
HpcTicksLabel mod -> pure $ HpcTicksLabel mod
SRTLabel unique -> SRTLabel <$> f unique
LargeBitmapLabel unique -> LargeBitmapLabel <$> f unique
-- This is called *a lot* if renaming Cmm uniques, and won't specialise without this pragma:
{-# INLINABLE mapInternalNonDetUniques #-}