Module hierarchy: Cmm (cf #13009)

140 files changed, 678 insertions, 677 deletions

diff --git a/aclocal.m4 b/aclocal.m4
index 4a037a46fd..3dc30eb7d9 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -999,7 +999,7 @@ else
 fi;
 changequote([, ])dnl
 ])
-if test ! -f compiler/parser/Parser.hs || test ! -f compiler/cmm/CmmParse.hs
+if test ! -f compiler/parser/Parser.hs || test ! -f compiler/GHC/Cmm/Parser.hs
 then
     FP_COMPARE_VERSIONS([$fptools_cv_happy_version],[-lt],[1.19.10],
       [AC_MSG_ERROR([Happy version 1.19.10 or later is required to compile GHC.])])[]
diff --git a/compiler/cmm/Cmm.hs b/compiler/GHC/Cmm.hs
index e08b22fa9b..5efecdc534 100644
--- a/compiler/cmm/Cmm.hs
+++ b/compiler/GHC/Cmm.hs
@@ -1,7 +1,7 @@
 -- Cmm representations using Hoopl's Graph CmmNode e x.
 {-# LANGUAGE GADTs #-}
 
-module Cmm (
+module GHC.Cmm (
      -- * Cmm top-level datatypes
      CmmProgram, CmmGroup, GenCmmGroup,
      CmmDecl, GenCmmDecl(..),
@@ -21,23 +21,23 @@ module Cmm (
      ProfilingInfo(..), ConstrDescription,
 
      -- * Statements, expressions and types
-     module CmmNode,
-     module CmmExpr,
+     module GHC.Cmm.Node,
+     module GHC.Cmm.Expr,
   ) where
 
 import GhcPrelude
 
 import Id
 import CostCentre
-import CLabel
-import BlockId
-import CmmNode
-import SMRep
-import CmmExpr
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import Hoopl.Label
+import GHC.Cmm.CLabel
+import GHC.Cmm.BlockId
+import GHC.Cmm.Node
+import GHC.Runtime.Layout
+import GHC.Cmm.Expr
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
 import Outputable
 import Data.ByteString (ByteString)
 
@@ -126,7 +126,7 @@ data CmmStackInfo
                -- used by the stack allocator later.
        updfr_space :: Maybe ByteOff,
                -- XXX: this never contains anything useful, but it should.
-               -- See comment in CmmLayoutStack.
+               -- See comment in GHC.Cmm.LayoutStack.
        do_layout :: Bool
                -- Do automatic stack layout for this proc.  This is
                -- True for all code generated by the code generator,
@@ -149,13 +149,13 @@ data CmmInfoTable
         -- the code generator, because we might want to add SRT
         -- entries to them later (for FUNs at least; THUNKs are
         -- treated the same for consistency). See Note [SRTs] in
-        -- CmmBuildInfoTables, in particular the [FUN] optimisation.
+        -- GHC.Cmm.Info.Build, in particular the [FUN] optimisation.
         --
         -- This is strictly speaking not a part of the info table that
         -- will be finally generated, but it's the only convenient
         -- place to convey this information from the code generator to
         -- where we build the static closures in
-        -- CmmBuildInfoTables.doSRTs.
+        -- GHC.Cmm.Info.Build.doSRTs.
     }
 
 data ProfilingInfo
diff --git a/compiler/cmm/BlockId.hs b/compiler/GHC/Cmm/BlockId.hs
index 4f4e0e8c53..f7f369551b 100644
--- a/compiler/cmm/BlockId.hs
+++ b/compiler/GHC/Cmm/BlockId.hs
@@ -2,7 +2,7 @@
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
 {- BlockId module should probably go away completely, being superseded by Label -}
-module BlockId
+module GHC.Cmm.BlockId
   ( BlockId, mkBlockId -- ToDo: BlockId should be abstract, but it isn't yet
   , newBlockId
   , blockLbl, infoTblLbl
@@ -10,13 +10,13 @@ module BlockId
 
 import GhcPrelude
 
-import CLabel
+import GHC.Cmm.CLabel
 import IdInfo
 import Name
 import Unique
 import UniqSupply
 
-import Hoopl.Label (Label, mkHooplLabel)
+import GHC.Cmm.Dataflow.Label (Label, mkHooplLabel)
 
 ----------------------------------------------------------------
 --- Block Ids, their environments, and their sets
diff --git a/compiler/GHC/Cmm/BlockId.hs-boot b/compiler/GHC/Cmm/BlockId.hs-boot
new file mode 100644
index 0000000000..76fd6180a9
--- /dev/null
+++ b/compiler/GHC/Cmm/BlockId.hs-boot
@@ -0,0 +1,8 @@
+module GHC.Cmm.BlockId (BlockId, mkBlockId) where
+
+import GHC.Cmm.Dataflow.Label (Label)
+import Unique (Unique)
+
+type BlockId = Label
+
+mkBlockId :: Unique -> BlockId
diff --git a/compiler/cmm/CLabel.hs b/compiler/GHC/Cmm/CLabel.hs
index fb2f06716d..e84278bf65 100644
--- a/compiler/cmm/CLabel.hs
+++ b/compiler/GHC/Cmm/CLabel.hs
@@ -8,7 +8,7 @@
 
 {-# LANGUAGE CPP #-}
 
-module CLabel (
+module GHC.Cmm.CLabel (
         CLabel, -- abstract type
         ForeignLabelSource(..),
         pprDebugCLabel,
@@ -115,7 +115,7 @@ import GhcPrelude
 
 import IdInfo
 import BasicTypes
-import {-# SOURCE #-} BlockId (BlockId, mkBlockId)
+import {-# SOURCE #-} GHC.Cmm.BlockId (BlockId, mkBlockId)
 import Packages
 import Module
 import Name
@@ -746,7 +746,7 @@ hasCAF _                            = False
 
 -- Until 14 Feb 2013, every ticky counter was associated with a
 -- closure. Thus, ticky labels used IdLabel. It is odd that
--- CmmBuildInfoTables.cafTransfers would consider such a ticky label
+-- 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.
diff --git a/compiler/cmm/CmmCallConv.hs b/compiler/GHC/Cmm/CallConv.hs
index df1eaad005..9200daec57 100644
--- a/compiler/cmm/CmmCallConv.hs
+++ b/compiler/GHC/Cmm/CallConv.hs
@@ -1,4 +1,4 @@
-module CmmCallConv (
+module GHC.Cmm.CallConv (
   ParamLocation(..),
   assignArgumentsPos,
   assignStack,
@@ -7,10 +7,10 @@ module CmmCallConv (
 
 import GhcPrelude
 
-import CmmExpr
-import SMRep
-import Cmm (Convention(..))
-import PprCmm () -- For Outputable instances
+import GHC.Cmm.Expr
+import GHC.Runtime.Layout
+import GHC.Cmm (Convention(..))
+import GHC.Cmm.Ppr () -- For Outputable instances
 
 import DynFlags
 import GHC.Platform
diff --git a/compiler/cmm/CmmCommonBlockElim.hs b/compiler/GHC/Cmm/CommonBlockElim.hs
index cbf7d83d36..86ea0e94e2 100644
--- a/compiler/cmm/CmmCommonBlockElim.hs
+++ b/compiler/GHC/Cmm/CommonBlockElim.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE GADTs, BangPatterns, ScopedTypeVariables #-}
 
-module CmmCommonBlockElim
+module GHC.Cmm.CommonBlockElim
   ( elimCommonBlocks
   )
 where
@@ -8,16 +8,16 @@ where
 
 import GhcPrelude hiding (iterate, succ, unzip, zip)
 
-import BlockId
-import Cmm
-import CmmUtils
-import CmmSwitch (eqSwitchTargetWith)
-import CmmContFlowOpt
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch (eqSwitchTargetWith)
+import GHC.Cmm.ContFlowOpt
 
-import Hoopl.Block
-import Hoopl.Graph
-import Hoopl.Label
-import Hoopl.Collections
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Collections
 import Data.Bits
 import Data.Maybe (mapMaybe)
 import qualified Data.List as List
diff --git a/compiler/cmm/CmmContFlowOpt.hs b/compiler/GHC/Cmm/ContFlowOpt.hs
index 606da02969..7765972d02 100644
--- a/compiler/cmm/CmmContFlowOpt.hs
+++ b/compiler/GHC/Cmm/ContFlowOpt.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE BangPatterns #-}
 {-# OPTIONS_GHC -fno-warn-incomplete-patterns #-}
-module CmmContFlowOpt
+module GHC.Cmm.ContFlowOpt
     ( cmmCfgOpts
     , cmmCfgOptsProc
     , removeUnreachableBlocksProc
@@ -11,14 +11,14 @@ where
 
 import GhcPrelude hiding (succ, unzip, zip)
 
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import Hoopl.Label
-import BlockId
-import Cmm
-import CmmUtils
-import CmmSwitch (mapSwitchTargets, switchTargetsToList)
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch (mapSwitchTargets, switchTargetsToList)
 import Maybes
 import Panic
 import Util
diff --git a/compiler/cmm/Hoopl/Dataflow.hs b/compiler/GHC/Cmm/Dataflow.hs
index 9762a84e20..fcabb1df0f 100644
--- a/compiler/cmm/Hoopl/Dataflow.hs
+++ b/compiler/GHC/Cmm/Dataflow.hs
@@ -17,7 +17,7 @@
 -- specialised to the UniqSM monad.
 --
 
-module Hoopl.Dataflow
+module GHC.Cmm.Dataflow
   ( C, O, Block
   , lastNode, entryLabel
   , foldNodesBwdOO
@@ -36,7 +36,7 @@ where
 
 import GhcPrelude
 
-import Cmm
+import GHC.Cmm
 import UniqSupply
 
 import Data.Array
@@ -44,10 +44,10 @@ import Data.Maybe
 import Data.IntSet (IntSet)
 import qualified Data.IntSet as IntSet
 
-import Hoopl.Block
-import Hoopl.Graph
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 
 type family   Fact (x :: Extensibility) f :: *
 type instance Fact C f = FactBase f
diff --git a/compiler/cmm/Hoopl/Block.hs b/compiler/GHC/Cmm/Dataflow/Block.hs
index 07aafe8ae9..d2e52a8904 100644
--- a/compiler/cmm/Hoopl/Block.hs
+++ b/compiler/GHC/Cmm/Dataflow/Block.hs
@@ -6,7 +6,7 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TypeFamilies #-}
-module Hoopl.Block
+module GHC.Cmm.Dataflow.Block
     ( Extensibility (..)
     , O
     , C
diff --git a/compiler/cmm/Hoopl/Collections.hs b/compiler/GHC/Cmm/Dataflow/Collections.hs
index 4c5516be79..f131f17cc1 100644
--- a/compiler/cmm/Hoopl/Collections.hs
+++ b/compiler/GHC/Cmm/Dataflow/Collections.hs
@@ -4,7 +4,7 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
-module Hoopl.Collections
+module GHC.Cmm.Dataflow.Collections
     ( IsSet(..)
     , setInsertList, setDeleteList, setUnions
     , IsMap(..)
diff --git a/compiler/cmm/Hoopl/Graph.hs b/compiler/GHC/Cmm/Dataflow/Graph.hs
index 992becb417..3f361de0fb 100644
--- a/compiler/cmm/Hoopl/Graph.hs
+++ b/compiler/GHC/Cmm/Dataflow/Graph.hs
@@ -5,7 +5,7 @@
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
-module Hoopl.Graph
+module GHC.Cmm.Dataflow.Graph
     ( Body
     , Graph
     , Graph'(..)
@@ -23,9 +23,9 @@ module Hoopl.Graph
 import GhcPrelude
 import Util
 
-import Hoopl.Label
-import Hoopl.Block
-import Hoopl.Collections
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
 
 -- | A (possibly empty) collection of closed/closed blocks
 type Body n = LabelMap (Block n C C)
diff --git a/compiler/cmm/Hoopl/Label.hs b/compiler/GHC/Cmm/Dataflow/Label.hs
index 2e75d97244..c571cedb48 100644
--- a/compiler/cmm/Hoopl/Label.hs
+++ b/compiler/GHC/Cmm/Dataflow/Label.hs
@@ -4,7 +4,7 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
-module Hoopl.Label
+module GHC.Cmm.Dataflow.Label
     ( Label
     , LabelMap
     , LabelSet
@@ -18,7 +18,7 @@ import GhcPrelude
 import Outputable
 
 -- TODO: This should really just use GHC's Unique and Uniq{Set,FM}
-import Hoopl.Collections
+import GHC.Cmm.Dataflow.Collections
 
 import Unique (Uniquable(..))
 import TrieMap
diff --git a/compiler/cmm/Debug.hs b/compiler/GHC/Cmm/DebugBlock.hs
index 712dd4ba98..70fc08ee94 100644
--- a/compiler/cmm/Debug.hs
+++ b/compiler/GHC/Cmm/DebugBlock.hs
@@ -10,7 +10,7 @@
 --
 -----------------------------------------------------------------------------
 
-module Debug (
+module GHC.Cmm.DebugBlock (
 
   DebugBlock(..),
   cmmDebugGen,
@@ -25,22 +25,22 @@ module Debug (
 
 import GhcPrelude
 
-import BlockId
-import CLabel
-import Cmm
-import CmmUtils
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm
+import GHC.Cmm.Utils
 import CoreSyn
 import FastString      ( nilFS, mkFastString )
 import Module
 import Outputable
-import PprCmmExpr      ( pprExpr )
+import GHC.Cmm.Ppr.Expr ( pprExpr )
 import SrcLoc
 import Util            ( seqList )
 
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
 
 import Data.Maybe
 import Data.List     ( minimumBy, nubBy )
@@ -316,7 +316,7 @@ with a typical C-- procedure as would come from the STG-to-Cmm code generator,
   },
 
 Let's consider how this procedure will be decorated with unwind information
-(largely by CmmLayoutStack). Naturally, when we enter the procedure `entry` the
+(largely by GHC.Cmm.LayoutStack). Naturally, when we enter the procedure `entry` the
 value of Sp is no different from what it was at its call site. Therefore we will
 add an `unwind` statement saying this at the beginning of its unwind-annotated
 code,
@@ -369,7 +369,7 @@ The flow of unwinding information through the compiler is a bit convoluted:
    haven't actually done any register assignment or stack layout yet, so there
    is no need for unwind information.
 
- * CmmLayoutStack figures out how to layout each procedure's stack, and produces
+ * GHC.Cmm.LayoutStack figures out how to layout each procedure's stack, and produces
    appropriate unwinding nodes for each adjustment of the STG Sp register.
 
  * The unwind nodes are carried through the sinking pass. Currently this is
diff --git a/compiler/cmm/CmmExpr.hs b/compiler/GHC/Cmm/Expr.hs
index 860ee1a7f5..3b4f0156a0 100644
--- a/compiler/cmm/CmmExpr.hs
+++ b/compiler/GHC/Cmm/Expr.hs
@@ -4,7 +4,7 @@
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE UndecidableInstances #-}
 
-module CmmExpr
+module GHC.Cmm.Expr
     ( CmmExpr(..), cmmExprType, cmmExprWidth, cmmExprAlignment, maybeInvertCmmExpr
     , CmmReg(..), cmmRegType, cmmRegWidth
     , CmmLit(..), cmmLitType
@@ -25,17 +25,17 @@ module CmmExpr
     , regSetToList
 
     , Area(..)
-    , module CmmMachOp
-    , module CmmType
+    , module GHC.Cmm.MachOp
+    , module GHC.Cmm.Type
     )
 where
 
 import GhcPrelude
 
-import BlockId
-import CLabel
-import CmmMachOp
-import CmmType
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm.MachOp
+import GHC.Cmm.Type
 import DynFlags
 import Outputable (panic)
 import Unique
@@ -83,7 +83,7 @@ data CmmReg
 data Area
   = Old            -- See Note [Old Area]
   | Young {-# UNPACK #-} !BlockId  -- Invariant: must be a continuation BlockId
-                   -- See Note [Continuation BlockId] in CmmNode.
+                   -- See Note [Continuation BlockId] in GHC.Cmm.Node.
   deriving (Eq, Ord)
 
 {- Note [Old Area]
@@ -200,7 +200,7 @@ data CmmLit
 
   | CmmBlock {-# UNPACK #-} !BlockId     -- Code label
         -- Invariant: must be a continuation BlockId
-        -- See Note [Continuation BlockId] in CmmNode.
+        -- See Note [Continuation BlockId] in GHC.Cmm.Node.
 
   | CmmHighStackMark -- A late-bound constant that stands for the max
                      -- #bytes of stack space used during a procedure.
@@ -408,7 +408,7 @@ There are no specific rules about which registers might overlap with
 which other registers, but presumably it's safe to assume that nothing
 will overlap with special registers like Sp or BaseReg.
 
-Use CmmUtils.regsOverlap to determine whether two GlobalRegs overlap
+Use GHC.Cmm.Utils.regsOverlap to determine whether two GlobalRegs overlap
 on a particular platform. The instance Eq GlobalReg is syntactic
 equality of STG registers and does not take overlap into
 account. However it is still used in UserOfRegs/DefinerOfRegs and
diff --git a/compiler/cmm/MkGraph.hs b/compiler/GHC/Cmm/Graph.hs
index c6e62435a2..8d19e7fdb9 100644
--- a/compiler/cmm/MkGraph.hs
+++ b/compiler/GHC/Cmm/Graph.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE BangPatterns, GADTs #-}
 
-module MkGraph
+module GHC.Cmm.Graph
   ( CmmAGraph, CmmAGraphScoped, CgStmt(..)
   , (<*>), catAGraphs
   , mkLabel, mkMiddle, mkLast, outOfLine
@@ -23,19 +23,19 @@ where
 
 import GhcPrelude hiding ( (<*>) ) -- avoid importing (<*>)
 
-import BlockId
-import Cmm
-import CmmCallConv
-import CmmSwitch (SwitchTargets)
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.CallConv
+import GHC.Cmm.Switch (SwitchTargets)
 
-import Hoopl.Block
-import Hoopl.Graph
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
 import DynFlags
 import FastString
 import ForeignCall
 import OrdList
-import SMRep (ByteOff)
+import GHC.Runtime.Layout (ByteOff)
 import UniqSupply
 import Util
 import Panic
diff --git a/compiler/cmm/CmmInfo.hs b/compiler/GHC/Cmm/Info.hs
index 3ef3d5001e..a10db2b292 100644
--- a/compiler/cmm/CmmInfo.hs
+++ b/compiler/GHC/Cmm/Info.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE CPP #-}
-module CmmInfo (
+module GHC.Cmm.Info (
   mkEmptyContInfoTable,
   cmmToRawCmm,
   mkInfoTable,
@@ -36,14 +36,14 @@ module CmmInfo (
 
 import GhcPrelude
 
-import Cmm
-import CmmUtils
-import CLabel
-import SMRep
-import Bitmap
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
+import GHC.Runtime.Layout
+import GHC.Data.Bitmap
 import Stream (Stream)
 import qualified Stream
-import Hoopl.Collections
+import GHC.Cmm.Dataflow.Collections
 
 import GHC.Platform
 import Maybes
@@ -281,7 +281,7 @@ mkSRTLit dflags _ (Just lbl) = ([CmmLabel lbl], CmmInt 1 (halfWordWidth dflags))
 -- | Is the SRT offset field inline in the info table on this platform?
 --
 -- See the section "Referring to an SRT from the info table" in
--- Note [SRTs] in CmmBuildInfoTables.hs
+-- Note [SRTs] in GHC.Cmm.Info.Build
 inlineSRT :: DynFlags -> Bool
 inlineSRT dflags = platformArch (targetPlatform dflags) == ArchX86_64
   && tablesNextToCode dflags
diff --git a/compiler/cmm/CmmBuildInfoTables.hs b/compiler/GHC/Cmm/Info/Build.hs
index 81c86fdad5..1ba79befcd 100644
--- a/compiler/cmm/CmmBuildInfoTables.hs
+++ b/compiler/GHC/Cmm/Info/Build.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE GADTs, BangPatterns, RecordWildCards,
     GeneralizedNewtypeDeriving, NondecreasingIndentation, TupleSections #-}
 
-module CmmBuildInfoTables
+module GHC.Cmm.Info.Build
   ( CAFSet, CAFEnv, cafAnal
   , doSRTs, ModuleSRTInfo, emptySRT
   ) where
@@ -9,22 +9,22 @@ module CmmBuildInfoTables
 import GhcPrelude hiding (succ)
 
 import Id
-import BlockId
-import Hoopl.Block
-import Hoopl.Graph
-import Hoopl.Label
-import Hoopl.Collections
-import Hoopl.Dataflow
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow
 import Module
 import GHC.Platform
 import Digraph
-import CLabel
-import Cmm
-import CmmUtils
+import GHC.Cmm.CLabel
+import GHC.Cmm
+import GHC.Cmm.Utils
 import DynFlags
 import Maybes
 import Outputable
-import SMRep
+import GHC.Runtime.Layout
 import UniqSupply
 import CostCentre
 import GHC.StgToCmm.Heap
diff --git a/compiler/cmm/CmmLayoutStack.hs b/compiler/GHC/Cmm/LayoutStack.hs
index e26f2878c0..f6dda7728c 100644
--- a/compiler/cmm/CmmLayoutStack.hs
+++ b/compiler/GHC/Cmm/LayoutStack.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE BangPatterns, RecordWildCards, GADTs #-}
-module CmmLayoutStack (
+module GHC.Cmm.LayoutStack (
        cmmLayoutStack, setInfoTableStackMap
   ) where
 
@@ -9,21 +9,21 @@ import GHC.StgToCmm.Utils      ( callerSaveVolatileRegs, newTemp  ) -- XXX layer
 import GHC.StgToCmm.Foreign    ( saveThreadState, loadThreadState ) -- XXX layering violation
 
 import BasicTypes
-import Cmm
-import CmmInfo
-import BlockId
-import CLabel
-import CmmUtils
-import MkGraph
+import GHC.Cmm
+import GHC.Cmm.Info
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm.Utils
+import GHC.Cmm.Graph
 import ForeignCall
-import CmmLive
-import CmmProcPoint
-import SMRep
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Dataflow
-import Hoopl.Graph
-import Hoopl.Label
+import GHC.Cmm.Liveness
+import GHC.Cmm.ProcPoint
+import GHC.Runtime.Layout
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
 import UniqSupply
 import Maybes
 import UniqFM
diff --git a/compiler/cmm/CmmLex.x b/compiler/GHC/Cmm/Lexer.x
index 468ea00a93..d8f15b916c 100644
--- a/compiler/cmm/CmmLex.x
+++ b/compiler/GHC/Cmm/Lexer.x
@@ -11,16 +11,16 @@
 -----------------------------------------------------------------------------
 
 {
-module CmmLex (
+module GHC.Cmm.Lexer (
    CmmToken(..), cmmlex,
   ) where
 
 import GhcPrelude
 
-import CmmExpr
+import GHC.Cmm.Expr
 
 import Lexer
-import CmmMonad
+import GHC.Cmm.Monad
 import SrcLoc
 import UniqFM
 import StringBuffer
diff --git a/compiler/cmm/CmmLint.hs b/compiler/GHC/Cmm/Lint.hs
index 3ad65bd536..d70fed3b9e 100644
--- a/compiler/cmm/CmmLint.hs
+++ b/compiler/GHC/Cmm/Lint.hs
@@ -7,28 +7,28 @@
 -----------------------------------------------------------------------------
 {-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE GADTs #-}
-module CmmLint (
+module GHC.Cmm.Lint (
     cmmLint, cmmLintGraph
   ) where
 
 import GhcPrelude
 
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import Hoopl.Label
-import Cmm
-import CmmUtils
-import CmmLive
-import CmmSwitch (switchTargetsToList)
-import PprCmm () -- For Outputable instances
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Liveness
+import GHC.Cmm.Switch (switchTargetsToList)
+import GHC.Cmm.Ppr () -- For Outputable instances
 import Outputable
 import DynFlags
 
 import Control.Monad (ap)
 
 -- Things to check:
---     - invariant on CmmBlock in CmmExpr (see comment there)
+--     - invariant on CmmBlock in GHC.Cmm.Expr (see comment there)
 --     - check for branches to blocks that don't exist
 --     - check types
 
diff --git a/compiler/cmm/CmmLive.hs b/compiler/GHC/Cmm/Liveness.hs
index ca474ef61c..2b598f52e5 100644
--- a/compiler/cmm/CmmLive.hs
+++ b/compiler/GHC/Cmm/Liveness.hs
@@ -3,7 +3,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
-module CmmLive
+module GHC.Cmm.Liveness
     ( CmmLocalLive
     , cmmLocalLiveness
     , cmmGlobalLiveness
@@ -15,13 +15,13 @@ where
 import GhcPrelude
 
 import DynFlags
-import BlockId
-import Cmm
-import PprCmmExpr () -- For Outputable instances
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Dataflow
-import Hoopl.Label
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Ppr.Expr () -- For Outputable instances
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow
+import GHC.Cmm.Dataflow.Label
 
 import Maybes
 import Outputable
diff --git a/compiler/cmm/CmmMachOp.hs b/compiler/GHC/Cmm/MachOp.hs
index 418ebec13f..234001545c 100644
--- a/compiler/cmm/CmmMachOp.hs
+++ b/compiler/GHC/Cmm/MachOp.hs
@@ -1,4 +1,4 @@
-module CmmMachOp
+module GHC.Cmm.MachOp
     ( MachOp(..)
     , pprMachOp, isCommutableMachOp, isAssociativeMachOp
     , isComparisonMachOp, maybeIntComparison, machOpResultType
@@ -28,7 +28,7 @@ where
 
 import GhcPrelude
 
-import CmmType
+import GHC.Cmm.Type
 import Outputable
 import DynFlags
 
diff --git a/compiler/cmm/CmmMonad.hs b/compiler/GHC/Cmm/Monad.hs
index a04c4ad49b..6b8d00a118 100644
--- a/compiler/cmm/CmmMonad.hs
+++ b/compiler/GHC/Cmm/Monad.hs
@@ -9,7 +9,7 @@
 -- The parser for C-- requires access to a lot more of the 'DynFlags',
 -- so 'PD' provides access to 'DynFlags' via a 'HasDynFlags' instance.
 -----------------------------------------------------------------------------
-module CmmMonad (
+module GHC.Cmm.Monad (
     PD(..)
   , liftP
   ) where
diff --git a/compiler/cmm/CmmNode.hs b/compiler/GHC/Cmm/Node.hs
index f9bad961e6..bb74647910 100644
--- a/compiler/cmm/CmmNode.hs
+++ b/compiler/GHC/Cmm/Node.hs
@@ -12,7 +12,7 @@
 
 -- CmmNode type for representation using Hoopl graphs.
 
-module CmmNode (
+module GHC.Cmm.Node (
      CmmNode(..), CmmFormal, CmmActual, CmmTickish,
      UpdFrameOffset, Convention(..),
      ForeignConvention(..), ForeignTarget(..), foreignTargetHints,
@@ -27,20 +27,20 @@ module CmmNode (
 import GhcPrelude hiding (succ)
 
 import GHC.Platform.Regs
-import CmmExpr
-import CmmSwitch
+import GHC.Cmm.Expr
+import GHC.Cmm.Switch
 import DynFlags
 import FastString
 import ForeignCall
 import Outputable
-import SMRep
+import GHC.Runtime.Layout
 import CoreSyn (Tickish)
 import qualified Unique as U
 
-import Hoopl.Block
-import Hoopl.Graph
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 import Data.Maybe
 import Data.List (tails,sortBy)
 import Unique (nonDetCmpUnique)
@@ -190,7 +190,7 @@ after we've saved Sp all the Cmm optimiser's assumptions are broken.
 Note that a safe foreign call needs an info table.
 
 So Safe Foreign Calls must remain as last nodes until the stack is
-made manifest in CmmLayoutStack, where they are lowered into the above
+made manifest in GHC.Cmm.LayoutStack, where they are lowered into the above
 sequence.
 -}
 
@@ -225,7 +225,7 @@ code generation in callerSaveVolatileRegs in GHC.StgToCmm.Utils.  However,
 one result of doing this is that the contents of these registers
 may mysteriously change if referenced inside the arguments.  This
 is dangerous, so you'll need to disable inlining much in the same
-way is done in cmm/CmmOpt.hs currently.  We should fix this!
+way is done in GHC.Cmm.Opt currently.  We should fix this!
 -}
 
 ---------------------------------------------
@@ -449,7 +449,7 @@ instance DefinerOfRegs GlobalReg (CmmNode e x) where
 -- this we need to treat safe foreign call as if was normal call.
 
 -----------------------------------
--- mapping Expr in CmmNode
+-- mapping Expr in GHC.Cmm.Node
 
 mapForeignTarget :: (CmmExpr -> CmmExpr) -> ForeignTarget -> ForeignTarget
 mapForeignTarget exp   (ForeignTarget e c) = ForeignTarget (exp e) c
@@ -481,7 +481,7 @@ mapExpDeep :: (CmmExpr -> CmmExpr) -> CmmNode e x -> CmmNode e x
 mapExpDeep f = mapExp $ wrapRecExp f
 
 ------------------------------------------------------------------------
--- mapping Expr in CmmNode, but not performing allocation if no changes
+-- mapping Expr in GHC.Cmm.Node, but not performing allocation if no changes
 
 mapForeignTargetM :: (CmmExpr -> Maybe CmmExpr) -> ForeignTarget -> Maybe ForeignTarget
 mapForeignTargetM f (ForeignTarget e c) = (\x -> ForeignTarget x c) `fmap` f e
@@ -533,7 +533,7 @@ mapExpDeepM :: (CmmExpr -> Maybe CmmExpr) -> CmmNode e x -> Maybe (CmmNode e x)
 mapExpDeepM f = mapExpM $ wrapRecExpM f
 
 -----------------------------------
--- folding Expr in CmmNode
+-- folding Expr in GHC.Cmm.Node
 
 foldExpForeignTarget :: (CmmExpr -> z -> z) -> ForeignTarget -> z -> z
 foldExpForeignTarget exp (ForeignTarget e _) z = exp e z
diff --git a/compiler/cmm/CmmOpt.hs b/compiler/GHC/Cmm/Opt.hs
index 5b542a390e..1db37ae58c 100644
--- a/compiler/cmm/CmmOpt.hs
+++ b/compiler/GHC/Cmm/Opt.hs
@@ -6,7 +6,7 @@
 --
 -----------------------------------------------------------------------------
 
-module CmmOpt (
+module GHC.Cmm.Opt (
         constantFoldNode,
         constantFoldExpr,
         cmmMachOpFold,
@@ -15,8 +15,8 @@ module CmmOpt (
 
 import GhcPrelude
 
-import CmmUtils
-import Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm
 import DynFlags
 import Util
 
diff --git a/compiler/cmm/CmmParse.y b/compiler/GHC/Cmm/Parser.y
index e568378197..d7235d0167 100644
--- a/compiler/cmm/CmmParse.y
+++ b/compiler/GHC/Cmm/Parser.y
@@ -200,12 +200,12 @@ necessary to the stack to accommodate it (e.g. 2).
 {
 {-# LANGUAGE TupleSections #-}
 
-module CmmParse ( parseCmmFile ) where
+module GHC.Cmm.Parser ( parseCmmFile ) where
 
 import GhcPrelude
 
 import GHC.StgToCmm.ExtCode
-import CmmCallConv
+import GHC.Cmm.CallConv
 import GHC.StgToCmm.Prof
 import GHC.StgToCmm.Heap
 import GHC.StgToCmm.Monad hiding ( getCode, getCodeR, getCodeScoped, emitLabel, emit
@@ -219,20 +219,20 @@ import GHC.StgToCmm.Closure
 import GHC.StgToCmm.Layout     hiding (ArgRep(..))
 import GHC.StgToCmm.Ticky
 import GHC.StgToCmm.Bind  ( emitBlackHoleCode, emitUpdateFrame )
-import CoreSyn          ( Tickish(SourceNote) )
-
-import CmmOpt
-import MkGraph
-import Cmm
-import CmmUtils
-import CmmSwitch        ( mkSwitchTargets )
-import CmmInfo
-import BlockId
-import CmmLex
-import CLabel
-import SMRep
+import CoreSyn            ( Tickish(SourceNote) )
+
+import GHC.Cmm.Opt
+import GHC.Cmm.Graph
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch     ( mkSwitchTargets )
+import GHC.Cmm.Info
+import GHC.Cmm.BlockId
+import GHC.Cmm.Lexer
+import GHC.Cmm.CLabel
+import GHC.Cmm.Monad
+import GHC.Runtime.Layout
 import Lexer
-import CmmMonad
 
 import CostCentre
 import ForeignCall
diff --git a/compiler/cmm/CmmPipeline.hs b/compiler/GHC/Cmm/Pipeline.hs
index e7689a6bfe..6db9e23ee1 100644
--- a/compiler/cmm/CmmPipeline.hs
+++ b/compiler/GHC/Cmm/Pipeline.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE BangPatterns #-}
 
-module CmmPipeline (
+module GHC.Cmm.Pipeline (
   -- | Converts C-- with an implicit stack and native C-- calls into
   -- optimized, CPS converted and native-call-less C--.  The latter
   -- C-- can be used to generate assembly.
@@ -9,16 +9,16 @@ module CmmPipeline (
 
 import GhcPrelude
 
-import Cmm
-import CmmLint
-import CmmBuildInfoTables
-import CmmCommonBlockElim
-import CmmImplementSwitchPlans
-import CmmProcPoint
-import CmmContFlowOpt
-import CmmLayoutStack
-import CmmSink
-import Hoopl.Collections
+import GHC.Cmm
+import GHC.Cmm.Lint
+import GHC.Cmm.Info.Build
+import GHC.Cmm.CommonBlockElim
+import GHC.Cmm.Switch.Implement
+import GHC.Cmm.ProcPoint
+import GHC.Cmm.ContFlowOpt
+import GHC.Cmm.LayoutStack
+import GHC.Cmm.Sink
+import GHC.Cmm.Dataflow.Collections
 
 import UniqSupply
 import DynFlags
diff --git a/compiler/cmm/PprCmm.hs b/compiler/GHC/Cmm/Ppr.hs
index 397a666022..891cbd9c6d 100644
--- a/compiler/cmm/PprCmm.hs
+++ b/compiler/GHC/Cmm/Ppr.hs
@@ -33,28 +33,28 @@
 --
 -- A useful example pass over Cmm is in nativeGen/MachCodeGen.hs
 
-module PprCmm
-  ( module PprCmmDecl
-  , module PprCmmExpr
+module GHC.Cmm.Ppr
+  ( module GHC.Cmm.Ppr.Decl
+  , module GHC.Cmm.Ppr.Expr
   )
 where
 
 import GhcPrelude hiding (succ)
 
-import CLabel
-import Cmm
-import CmmUtils
-import CmmSwitch
+import GHC.Cmm.CLabel
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
 import DynFlags
 import FastString
 import Outputable
-import PprCmmDecl
-import PprCmmExpr
+import GHC.Cmm.Ppr.Decl
+import GHC.Cmm.Ppr.Expr
 import Util
 
 import BasicTypes
-import Hoopl.Block
-import Hoopl.Graph
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
 
 -------------------------------------------------
 -- Outputable instances
diff --git a/compiler/cmm/PprCmmDecl.hs b/compiler/GHC/Cmm/Ppr/Decl.hs
index e54abdc8b6..2544e6a0d3 100644
--- a/compiler/cmm/PprCmmDecl.hs
+++ b/compiler/GHC/Cmm/Ppr/Decl.hs
@@ -33,15 +33,15 @@
 --
 
 {-# OPTIONS_GHC -fno-warn-orphans #-}
-module PprCmmDecl
+module GHC.Cmm.Ppr.Decl
     ( writeCmms, pprCmms, pprCmmGroup, pprSection, pprStatic
     )
 where
 
 import GhcPrelude
 
-import PprCmmExpr
-import Cmm
+import GHC.Cmm.Ppr.Expr
+import GHC.Cmm
 
 import DynFlags
 import Outputable
diff --git a/compiler/cmm/PprCmmExpr.hs b/compiler/GHC/Cmm/Ppr/Expr.hs
index 7bf73f1ca6..53a335e561 100644
--- a/compiler/cmm/PprCmmExpr.hs
+++ b/compiler/GHC/Cmm/Ppr/Expr.hs
@@ -33,14 +33,14 @@
 --
 
 {-# OPTIONS_GHC -fno-warn-orphans #-}
-module PprCmmExpr
+module GHC.Cmm.Ppr.Expr
     ( pprExpr, pprLit
     )
 where
 
 import GhcPrelude
 
-import CmmExpr
+import GHC.Cmm.Expr
 
 import Outputable
 import DynFlags
@@ -83,7 +83,7 @@ pprExpr e
         CmmLit lit -> pprLit lit
         _other     -> pprExpr1 e
 
--- Here's the precedence table from CmmParse.y:
+-- Here's the precedence table from GHC.Cmm.Parser:
 -- %nonassoc '>=' '>' '<=' '<' '!=' '=='
 -- %left '|'
 -- %left '^'
@@ -154,7 +154,7 @@ genMachOp mop args
         -- unary
         [x]   -> doc <> pprExpr9 x
 
-        _     -> pprTrace "PprCmm.genMachOp: machop with strange number of args"
+        _     -> pprTrace "GHC.Cmm.Ppr.Expr.genMachOp: machop with strange number of args"
                           (pprMachOp mop <+>
                             parens (hcat $ punctuate comma (map pprExpr args)))
                           empty
diff --git a/compiler/cmm/CmmProcPoint.hs b/compiler/GHC/Cmm/ProcPoint.hs
index 746a175cfe..00a7a73d89 100644
--- a/compiler/cmm/CmmProcPoint.hs
+++ b/compiler/GHC/Cmm/ProcPoint.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE GADTs, DisambiguateRecordFields, BangPatterns #-}
 
-module CmmProcPoint
+module GHC.Cmm.ProcPoint
     ( ProcPointSet, Status(..)
     , callProcPoints, minimalProcPointSet
     , splitAtProcPoints, procPointAnalysis
@@ -11,25 +11,25 @@ where
 import GhcPrelude hiding (last, unzip, succ, zip)
 
 import DynFlags
-import BlockId
-import CLabel
-import Cmm
-import PprCmm () -- For Outputable instances
-import CmmUtils
-import CmmInfo
-import CmmLive
-import CmmSwitch
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm
+import GHC.Cmm.Ppr () -- For Outputable instances
+import GHC.Cmm.Utils
+import GHC.Cmm.Info
+import GHC.Cmm.Liveness
+import GHC.Cmm.Switch
 import Data.List (sortBy)
 import Maybes
 import Control.Monad
 import Outputable
 import GHC.Platform
 import UniqSupply
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Dataflow
-import Hoopl.Graph
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
 
 -- Compute a minimal set of proc points for a control-flow graph.
 
@@ -386,7 +386,7 @@ splitAtProcPoints dflags entry_label callPPs procPoints procMap
             procs
 splitAtProcPoints _ _ _ _ _ t@(CmmData _ _) = return [t]
 
--- Only called from CmmProcPoint.splitAtProcPoints. NB. does a
+-- Only called from GHC.Cmm.ProcPoint.splitAtProcPoints. NB. does a
 -- recursive lookup, see comment below.
 replaceBranches :: LabelMap BlockId -> CmmGraph -> CmmGraph
 replaceBranches env cmmg
diff --git a/compiler/cmm/CmmSink.hs b/compiler/GHC/Cmm/Sink.hs
index 7d945b0396..8e231df300 100644
--- a/compiler/cmm/CmmSink.hs
+++ b/compiler/GHC/Cmm/Sink.hs
@@ -1,18 +1,18 @@
 {-# LANGUAGE GADTs #-}
-module CmmSink (
+module GHC.Cmm.Sink (
      cmmSink
   ) where
 
 import GhcPrelude
 
-import Cmm
-import CmmOpt
-import CmmLive
-import CmmUtils
-import Hoopl.Block
-import Hoopl.Label
-import Hoopl.Collections
-import Hoopl.Graph
+import GHC.Cmm
+import GHC.Cmm.Opt
+import GHC.Cmm.Liveness
+import GHC.Cmm.Utils
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
 import GHC.Platform.Regs
 import GHC.Platform (isARM, platformArch)
 
@@ -490,7 +490,7 @@ and apply above transformation to eliminate the comparison against 1.
 It's tempting to just turn every != into == and then let cmmMachOpFold
 do its thing, but that risks changing a nice fall-through conditional
 into one that requires two jumps. (see swapcond_last in
-CmmContFlowOpt), so instead we carefully look for just the cases where
+GHC.Cmm.ContFlowOpt), so instead we carefully look for just the cases where
 we can eliminate a comparison.
 -}
 improveConditional :: CmmNode O x -> CmmNode O x
diff --git a/compiler/cmm/CmmSwitch.hs b/compiler/GHC/Cmm/Switch.hs
index 26bf5c4ce9..e89fadfd2e 100644
--- a/compiler/cmm/CmmSwitch.hs
+++ b/compiler/GHC/Cmm/Switch.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE GADTs #-}
-module CmmSwitch (
+module GHC.Cmm.Switch (
      SwitchTargets,
      mkSwitchTargets,
      switchTargetsCases, switchTargetsDefault, switchTargetsRange, switchTargetsSigned,
@@ -15,7 +15,7 @@ import GhcPrelude
 
 import Outputable
 import DynFlags
-import Hoopl.Label (Label)
+import GHC.Cmm.Dataflow.Label (Label)
 
 import Data.Maybe
 import Data.List (groupBy)
@@ -32,9 +32,9 @@ import qualified Data.Map as M
 --
 -- The overall plan is:
 --  * The Stg → Cmm transformation creates a single `SwitchTargets` in
---    emitSwitch and emitCmmLitSwitch in GHC.StgToCmm/Utils.hs.
+--    emitSwitch and emitCmmLitSwitch in GHC.StgToCmm.Utils.
 --    At this stage, they are unsuitable for code generation.
---  * A dedicated Cmm transformation (CmmImplementSwitchPlans) replaces these
+--  * A dedicated Cmm transformation (GHC.Cmm.Switch.Implement) replaces these
 --    switch statements with code that is suitable for code generation, i.e.
 --    a nice balanced tree of decisions with dense jump tables in the leafs.
 --    The actual planning of this tree is performed in pure code in createSwitchPlan
@@ -42,15 +42,16 @@ import qualified Data.Map as M
 --  * The actual code generation will not do any further processing and
 --    implement each CmmSwitch with a jump tables.
 --
--- When compiling to LLVM or C, CmmImplementSwitchPlans leaves the switch
+-- When compiling to LLVM or C, GHC.Cmm.Switch.Implement leaves the switch
 -- statements alone, as we can turn a SwitchTargets value into a nice
 -- switch-statement in LLVM resp. C, and leave the rest to the compiler.
 --
--- See Note [CmmSwitch vs. CmmImplementSwitchPlans] why the two module are
+-- See Note [GHC.Cmm.Switch vs. GHC.Cmm.Switch.Implement] why the two module are
 -- separated.
 
 -----------------------------------------------------------------------------
--- Note [Magic Constants in CmmSwitch]
+-- Note [Magic Constants in GHC.Cmm.Switch]
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 --
 -- There are a lot of heuristics here that depend on magic values where it is
 -- hard to determine the "best" value (for whatever that means). These are the
@@ -78,8 +79,8 @@ minJumpTableOffset = 2
 -----------------------------------------------------------------------------
 -- Switch Targets
 
--- Note [SwitchTargets]:
--- ~~~~~~~~~~~~~~~~~~~~~
+-- Note [SwitchTargets]
+-- ~~~~~~~~~~~~~~~~~~~~
 --
 -- The branches of a switch are stored in a SwitchTargets, which consists of an
 -- (optional) default jump target, and a map from values to jump targets.
@@ -209,7 +210,7 @@ switchTargetsFallThrough (SwitchTargets _ _ mbdef branches) = (groups, mbdef)
              groupBy ((==) `on` snd) $
              M.toList branches
 
--- | Custom equality helper, needed for "CmmCommonBlockElim"
+-- | Custom equality helper, needed for "GHC.Cmm.CommonBlockElim"
 eqSwitchTargetWith :: (Label -> Label -> Bool) -> SwitchTargets -> SwitchTargets -> Bool
 eqSwitchTargetWith eq (SwitchTargets signed1 range1 mbdef1 ids1) (SwitchTargets signed2 range2 mbdef2 ids2) =
     signed1 == signed2 && range1 == range2 && goMB mbdef1 mbdef2 && goList (M.toList ids1) (M.toList ids2)
@@ -242,7 +243,7 @@ data SwitchPlan
 --
 -- createSwitchPlan creates such a switch plan, in these steps:
 --  1. It splits the switch statement at segments of non-default values that
---     are too large. See splitAtHoles and Note [Magic Constants in CmmSwitch]
+--     are too large. See splitAtHoles and Note [Magic Constants in GHC.Cmm.Switch]
 --  2. Too small jump tables should be avoided, so we break up smaller pieces
 --     in breakTooSmall.
 --  3. We fill in the segments between those pieces with a jump to the default
@@ -478,23 +479,24 @@ reassocTuples initial [] last
 reassocTuples initial ((a,b):tuples) last
     = (initial,a) : reassocTuples b tuples last
 
--- Note [CmmSwitch vs. CmmImplementSwitchPlans]
--- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+-- Note [GHC.Cmm.Switch vs. GHC.Cmm.Switch.Implement]
+-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 -- I (Joachim) separated the two somewhat closely related modules
 --
---  - CmmSwitch, which provides the CmmSwitchTargets type and contains the strategy
+--  - GHC.Cmm.Switch, which provides the CmmSwitchTargets type and contains the strategy
 --    for implementing a Cmm switch (createSwitchPlan), and
---  - CmmImplementSwitchPlans, which contains the actual Cmm graph modification,
+--  - GHC.Cmm.Switch.Implement, which contains the actual Cmm graph modification,
 --
 -- for these reasons:
 --
---  * CmmSwitch is very low in the dependency tree, i.e. does not depend on any
---    GHC specific modules at all (with the exception of Output and Hoople
---    (Literal)). CmmImplementSwitchPlans is the Cmm transformation and hence very
---    high in the dependency tree.
---  * CmmSwitch provides the CmmSwitchTargets data type, which is abstract, but
---    used in CmmNodes.
---  * Because CmmSwitch is low in the dependency tree, the separation allows
+--  * GHC.Cmm.Switch is very low in the dependency tree, i.e. does not depend on any
+--    GHC specific modules at all (with the exception of Output and
+--    GHC.Cmm.Dataflow (Literal)).
+--  * GHC.Cmm.Switch.Implement is the Cmm transformation and hence very high in
+--    the dependency tree.
+--  * GHC.Cmm.Switch provides the CmmSwitchTargets data type, which is abstract, but
+--    used in GHC.Cmm.Node.
+--  * Because GHC.Cmm.Switch is low in the dependency tree, the separation allows
 --    for more parallelism when building GHC.
 --  * The interaction between the modules is very explicit and easy to
 --    understand, due to the small and simple interface.
diff --git a/compiler/cmm/CmmImplementSwitchPlans.hs b/compiler/GHC/Cmm/Switch/Implement.hs
index 83c29cf6b5..dfac116764 100644
--- a/compiler/cmm/CmmImplementSwitchPlans.hs
+++ b/compiler/GHC/Cmm/Switch/Implement.hs
@@ -1,16 +1,16 @@
 {-# LANGUAGE GADTs #-}
-module CmmImplementSwitchPlans
+module GHC.Cmm.Switch.Implement
   ( cmmImplementSwitchPlans
   )
 where
 
 import GhcPrelude
 
-import Hoopl.Block
-import BlockId
-import Cmm
-import CmmUtils
-import CmmSwitch
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
 import UniqSupply
 import DynFlags
 
@@ -20,12 +20,12 @@ import DynFlags
 -- assembly code, by proper constructs (if-then-else trees, dense jump tables).
 --
 -- The actual, abstract strategy is determined by createSwitchPlan in
--- CmmSwitch and returned as a SwitchPlan; here is just the implementation in
--- terms of Cmm code. See Note [Cmm Switches, the general plan] in CmmSwitch.
+-- GHC.Cmm.Switch and returned as a SwitchPlan; here is just the implementation in
+-- terms of Cmm code. See Note [Cmm Switches, the general plan] in GHC.Cmm.Switch.
 --
 -- This division into different modules is both to clearly separate concerns,
 -- but also because createSwitchPlan needs access to the constructors of
--- SwitchTargets, a data type exported abstractly by CmmSwitch.
+-- SwitchTargets, a data type exported abstractly by GHC.Cmm.Switch.
 --
 
 -- | Traverses the 'CmmGraph', making sure that 'CmmSwitch' are suitable for
diff --git a/compiler/cmm/CmmType.hs b/compiler/GHC/Cmm/Type.hs
index f8ac71ac89..867a260078 100644
--- a/compiler/cmm/CmmType.hs
+++ b/compiler/GHC/Cmm/Type.hs
@@ -1,4 +1,4 @@
-module CmmType
+module GHC.Cmm.Type
     ( CmmType   -- Abstract
     , b8, b16, b32, b64, b128, b256, b512, f32, f64, bWord, bHalfWord, gcWord
     , cInt
diff --git a/compiler/cmm/CmmUtils.hs b/compiler/GHC/Cmm/Utils.hs
index 8920d2d6b9..d879c7b82f 100644
--- a/compiler/cmm/CmmUtils.hs
+++ b/compiler/GHC/Cmm/Utils.hs
@@ -9,7 +9,7 @@
 --
 -----------------------------------------------------------------------------
 
-module CmmUtils(
+module GHC.Cmm.Utils(
         -- CmmType
         primRepCmmType, slotCmmType, slotForeignHint,
         typeCmmType, typeForeignHint, primRepForeignHint,
@@ -73,10 +73,10 @@ import GhcPrelude
 import TyCon    ( PrimRep(..), PrimElemRep(..) )
 import GHC.Types.RepType  ( UnaryType, SlotTy (..), typePrimRep1 )
 
-import SMRep
-import Cmm
-import BlockId
-import CLabel
+import GHC.Runtime.Layout
+import GHC.Cmm
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
 import Outputable
 import DynFlags
 import Unique
@@ -85,10 +85,10 @@ import GHC.Platform.Regs
 import Data.ByteString (ByteString)
 import qualified Data.ByteString as BS
 import Data.Bits
-import Hoopl.Graph
-import Hoopl.Label
-import Hoopl.Block
-import Hoopl.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
 
 ---------------------------------------------------
 --
diff --git a/compiler/cmm/cmm-notes b/compiler/GHC/Cmm/cmm-notes
index 699f218257..d664a195b7 100644
--- a/compiler/cmm/cmm-notes
+++ b/compiler/GHC/Cmm/cmm-notes
@@ -19,7 +19,7 @@ Things we did
 More notes (June 11)
 ~~~~~~~~~~~~~~~~~~~~
 
-* In CmmContFlowOpts.branchChainElim, can a single block be the
+* In CmmContFlowOpt.branchChainElim, can a single block be the
   successor of two calls?
 
 * Check in ClosureInfo:
@@ -123,7 +123,7 @@ of calls don't need an info table.
 Figuring out proc-points
 ~~~~~~~~~~~~~~~~~~~~~~~~
 Proc-points are identified by
-CmmProcPoint.minimalProcPointSet/extendPPSet Although there isn't
+GHC.Cmm.ProcPoint.minimalProcPointSet/extendPPSet Although there isn't
 that much code, JD thinks that it could be done much more nicely using
 a dominator analysis, using the Dataflow Engine.
 
diff --git a/compiler/cmm/PprC.hs b/compiler/GHC/CmmToC.hs
index d94bc01e03..a413820e30 100644
--- a/compiler/cmm/PprC.hs
+++ b/compiler/GHC/CmmToC.hs
@@ -18,7 +18,7 @@
 --
 -----------------------------------------------------------------------------
 
-module PprC (
+module GHC.CmmToC (
         writeC
   ) where
 
@@ -27,16 +27,16 @@ module PprC (
 -- Cmm stuff
 import GhcPrelude
 
-import BlockId
-import CLabel
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
 import ForeignCall
-import Cmm hiding (pprBBlock)
-import PprCmm () -- For Outputable instances
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import CmmUtils
-import CmmSwitch
+import GHC.Cmm hiding (pprBBlock)
+import GHC.Cmm.Ppr () -- For Outputable instances
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
 
 -- Utils
 import CPrim
diff --git a/compiler/cmm/Bitmap.hs b/compiler/GHC/Data/Bitmap.hs
index 42acc5f3cd..a8eba5e2e8 100644
--- a/compiler/cmm/Bitmap.hs
+++ b/compiler/GHC/Data/Bitmap.hs
@@ -8,7 +8,7 @@
 -- places in generated code (stack frame liveness masks, function
 -- argument liveness masks, SRT bitmaps).
 
-module Bitmap (
+module GHC.Data.Bitmap (
         Bitmap, mkBitmap,
         intsToBitmap, intsToReverseBitmap,
         mAX_SMALL_BITMAP_SIZE,
@@ -17,7 +17,7 @@ module Bitmap (
 
 import GhcPrelude
 
-import SMRep
+import GHC.Runtime.Layout
 import DynFlags
 import Util
 
@@ -104,7 +104,7 @@ Note [Strictness when building Bitmaps]
 ========================================
 
 One of the places where @Bitmap@ is used is in in building Static Reference
-Tables (SRTs) (in @CmmBuildInfoTables.procpointSRT@). In #7450 it was noticed
+Tables (SRTs) (in @GHC.Cmm.Info.Build.procpointSRT@). In #7450 it was noticed
 that some test cases (particularly those whose C-- have large numbers of CAFs)
 produced large quantities of allocations from this function.
 
diff --git a/compiler/GHC/Platform/Regs.hs b/compiler/GHC/Platform/Regs.hs
index c304d4f5ad..51f7658db2 100644
--- a/compiler/GHC/Platform/Regs.hs
+++ b/compiler/GHC/Platform/Regs.hs
@@ -5,7 +5,7 @@ module GHC.Platform.Regs
 
 import GhcPrelude
 
-import CmmExpr
+import GHC.Cmm.Expr
 import GHC.Platform
 import Reg
 
diff --git a/compiler/cmm/SMRep.hs b/compiler/GHC/Runtime/Layout.hs
index fe4ed58bfe..8f245479c1 100644
--- a/compiler/cmm/SMRep.hs
+++ b/compiler/GHC/Runtime/Layout.hs
@@ -5,7 +5,7 @@
 
 {-# LANGUAGE CPP,GeneralizedNewtypeDeriving #-}
 
-module SMRep (
+module GHC.Runtime.Layout (
         -- * Words and bytes
         WordOff, ByteOff,
         wordsToBytes, bytesToWordsRoundUp,
diff --git a/compiler/GHC/Stg/Lift/Analysis.hs b/compiler/GHC/Stg/Lift/Analysis.hs
index 02d439cef7..ccbad37210 100644
--- a/compiler/GHC/Stg/Lift/Analysis.hs
+++ b/compiler/GHC/Stg/Lift/Analysis.hs
@@ -26,7 +26,7 @@ import BasicTypes
 import Demand
 import DynFlags
 import Id
-import SMRep ( WordOff )
+import GHC.Runtime.Layout ( WordOff )
 import GHC.Stg.Syntax
 import qualified GHC.StgToCmm.ArgRep  as StgToCmm.ArgRep
 import qualified GHC.StgToCmm.Closure as StgToCmm.Closure
diff --git a/compiler/GHC/StgToCmm.hs b/compiler/GHC/StgToCmm.hs
index 10a9dc2c6a..f489ce6456 100644
--- a/compiler/GHC/StgToCmm.hs
+++ b/compiler/GHC/StgToCmm.hs
@@ -26,9 +26,9 @@ import GHC.StgToCmm.Closure
 import GHC.StgToCmm.Hpc
 import GHC.StgToCmm.Ticky
 
-import Cmm
-import CmmUtils
-import CLabel
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
 
 import GHC.Stg.Syntax
 import DynFlags
@@ -48,7 +48,7 @@ import BasicTypes
 import VarSet ( isEmptyDVarSet )
 
 import OrdList
-import MkGraph
+import GHC.Cmm.Graph
 
 import Data.IORef
 import Control.Monad (when,void)
diff --git a/compiler/GHC/StgToCmm/ArgRep.hs b/compiler/GHC/StgToCmm/ArgRep.hs
index cc2fe8306a..347d908b44 100644
--- a/compiler/GHC/StgToCmm/ArgRep.hs
+++ b/compiler/GHC/StgToCmm/ArgRep.hs
@@ -19,7 +19,7 @@ import GhcPrelude
 
 import GHC.StgToCmm.Closure ( idPrimRep )
 
-import SMRep            ( WordOff )
+import GHC.Runtime.Layout            ( WordOff )
 import Id               ( Id )
 import TyCon            ( PrimRep(..), primElemRepSizeB )
 import BasicTypes       ( RepArity )
diff --git a/compiler/GHC/StgToCmm/Bind.hs b/compiler/GHC/StgToCmm/Bind.hs
index b1cb34ace7..a78ab5cb41 100644
--- a/compiler/GHC/StgToCmm/Bind.hs
+++ b/compiler/GHC/StgToCmm/Bind.hs
@@ -28,14 +28,14 @@ import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Closure
 import GHC.StgToCmm.Foreign    (emitPrimCall)
 
-import MkGraph
+import GHC.Cmm.Graph
 import CoreSyn          ( AltCon(..), tickishIsCode )
-import BlockId
-import SMRep
-import Cmm
-import CmmInfo
-import CmmUtils
-import CLabel
+import GHC.Cmm.BlockId
+import GHC.Runtime.Layout
+import GHC.Cmm
+import GHC.Cmm.Info
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
 import GHC.Stg.Syntax
 import CostCentre
 import Id
@@ -105,7 +105,7 @@ cgTopRhsClosure dflags rec id ccs upd_flag args body =
 
         -- We don't generate the static closure here, because we might
         -- want to add references to static closures to it later.  The
-        -- static closure is generated by CmmBuildInfoTables.updInfoSRTs,
+        -- static closure is generated by GHC.Cmm.Info.Build.updInfoSRTs,
         -- See Note [SRTs], specifically the [FUN] optimisation.
 
         ; let fv_details :: [(NonVoid Id, ByteOff)]
@@ -622,7 +622,7 @@ emitBlackHoleCode node = do
   -- unconditionally disabled. -- krc 1/2007
 
   -- Note the eager-blackholing check is here rather than in blackHoleOnEntry,
-  -- because emitBlackHoleCode is called from CmmParse.
+  -- because emitBlackHoleCode is called from GHC.Cmm.Parser.
 
   let  eager_blackholing =  not (gopt Opt_SccProfilingOn dflags)
                          && gopt Opt_EagerBlackHoling dflags
diff --git a/compiler/GHC/StgToCmm/CgUtils.hs b/compiler/GHC/StgToCmm/CgUtils.hs
index f3dccd9745..58c46f8fa2 100644
--- a/compiler/GHC/StgToCmm/CgUtils.hs
+++ b/compiler/GHC/StgToCmm/CgUtils.hs
@@ -19,11 +19,11 @@ module GHC.StgToCmm.CgUtils (
 import GhcPrelude
 
 import GHC.Platform.Regs
-import Cmm
-import Hoopl.Block
-import Hoopl.Graph
-import CmmUtils
-import CLabel
+import GHC.Cmm
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
 import DynFlags
 import Outputable
 
diff --git a/compiler/GHC/StgToCmm/Closure.hs b/compiler/GHC/StgToCmm/Closure.hs
index df8cb046c4..724ca6000a 100644
--- a/compiler/GHC/StgToCmm/Closure.hs
+++ b/compiler/GHC/StgToCmm/Closure.hs
@@ -67,13 +67,13 @@ module GHC.StgToCmm.Closure (
 import GhcPrelude
 
 import GHC.Stg.Syntax
-import SMRep
-import Cmm
-import PprCmmExpr() -- For Outputable instances
+import GHC.Runtime.Layout
+import GHC.Cmm
+import GHC.Cmm.Ppr.Expr() -- For Outputable instances
 
 import CostCentre
-import BlockId
-import CLabel
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
 import Id
 import IdInfo
 import DataCon
diff --git a/compiler/GHC/StgToCmm/DataCon.hs b/compiler/GHC/StgToCmm/DataCon.hs
index 1e929663df..2bbeabace6 100644
--- a/compiler/GHC/StgToCmm/DataCon.hs
+++ b/compiler/GHC/StgToCmm/DataCon.hs
@@ -29,11 +29,11 @@ import GHC.StgToCmm.Layout
 import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Closure
 
-import CmmExpr
-import CmmUtils
-import CLabel
-import MkGraph
-import SMRep
+import GHC.Cmm.Expr
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
+import GHC.Cmm.Graph
+import GHC.Runtime.Layout
 import CostCentre
 import Module
 import DataCon
diff --git a/compiler/GHC/StgToCmm/Env.hs b/compiler/GHC/StgToCmm/Env.hs
index 45b09a3d26..b2c1371840 100644
--- a/compiler/GHC/StgToCmm/Env.hs
+++ b/compiler/GHC/StgToCmm/Env.hs
@@ -31,14 +31,14 @@ import GHC.StgToCmm.Monad
 import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Closure
 
-import CLabel
+import GHC.Cmm.CLabel
 
-import BlockId
-import CmmExpr
-import CmmUtils
+import GHC.Cmm.BlockId
+import GHC.Cmm.Expr
+import GHC.Cmm.Utils
 import DynFlags
 import Id
-import MkGraph
+import GHC.Cmm.Graph
 import Name
 import Outputable
 import GHC.Stg.Syntax
diff --git a/compiler/GHC/StgToCmm/Expr.hs b/compiler/GHC/StgToCmm/Expr.hs
index 3836aa3d2a..0c2d9b8ae5 100644
--- a/compiler/GHC/StgToCmm/Expr.hs
+++ b/compiler/GHC/StgToCmm/Expr.hs
@@ -30,10 +30,10 @@ import GHC.StgToCmm.Closure
 
 import GHC.Stg.Syntax
 
-import MkGraph
-import BlockId
-import Cmm hiding ( succ )
-import CmmInfo
+import GHC.Cmm.Graph
+import GHC.Cmm.BlockId
+import GHC.Cmm hiding ( succ )
+import GHC.Cmm.Info
 import CoreSyn
 import DataCon
 import DynFlags         ( mAX_PTR_TAG )
diff --git a/compiler/GHC/StgToCmm/ExtCode.hs b/compiler/GHC/StgToCmm/ExtCode.hs
index 4a5225eec6..2679ce4992 100644
--- a/compiler/GHC/StgToCmm/ExtCode.hs
+++ b/compiler/GHC/StgToCmm/ExtCode.hs
@@ -42,11 +42,11 @@ import GhcPrelude
 import qualified GHC.StgToCmm.Monad as F
 import GHC.StgToCmm.Monad (FCode, newUnique)
 
-import Cmm
-import CLabel
-import MkGraph
+import GHC.Cmm
+import GHC.Cmm.CLabel
+import GHC.Cmm.Graph
 
-import BlockId
+import GHC.Cmm.BlockId
 import DynFlags
 import FastString
 import Module
diff --git a/compiler/GHC/StgToCmm/Foreign.hs b/compiler/GHC/StgToCmm/Foreign.hs
index 3ef0872c2e..62a948d13c 100644
--- a/compiler/GHC/StgToCmm/Foreign.hs
+++ b/compiler/GHC/StgToCmm/Foreign.hs
@@ -9,7 +9,7 @@
 module GHC.StgToCmm.Foreign (
   cgForeignCall,
   emitPrimCall, emitCCall,
-  emitForeignCall,     -- For CmmParse
+  emitForeignCall,
   emitSaveThreadState,
   saveThreadState,
   emitLoadThreadState,
@@ -28,14 +28,14 @@ import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Closure
 import GHC.StgToCmm.Layout
 
-import BlockId (newBlockId)
-import Cmm
-import CmmUtils
-import MkGraph
+import GHC.Cmm.BlockId (newBlockId)
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Graph
 import Type
 import GHC.Types.RepType
-import CLabel
-import SMRep
+import GHC.Cmm.CLabel
+import GHC.Runtime.Layout
 import ForeignCall
 import DynFlags
 import Maybes
@@ -202,7 +202,7 @@ emitPrimCall :: [CmmFormal] -> CallishMachOp -> [CmmActual] -> FCode ()
 emitPrimCall res op args
   = void $ emitForeignCall PlayRisky res (PrimTarget op) args
 
--- alternative entry point, used by CmmParse
+-- alternative entry point, used by GHC.Cmm.Parser
 emitForeignCall
         :: Safety
         -> [CmmFormal]          -- where to put the results
@@ -257,9 +257,9 @@ load_target_into_temp other_target@(PrimTarget _) =
 -- Note [Register Parameter Passing]).
 --
 -- However, we can't pattern-match on the expression here, because
--- this is used in a loop by CmmParse, and testing the expression
+-- this is used in a loop by GHC.Cmm.Parser, and testing the expression
 -- results in a black hole.  So we always create a temporary, and rely
--- on CmmSink to clean it up later.  (Yuck, ToDo).  The generated code
+-- on GHC.Cmm.Sink to clean it up later.  (Yuck, ToDo).  The generated code
 -- ends up being the same, at least for the RTS .cmm code.
 --
 maybe_assign_temp :: CmmExpr -> FCode CmmExpr
diff --git a/compiler/GHC/StgToCmm/Heap.hs b/compiler/GHC/StgToCmm/Heap.hs
index d36cad5788..492a4460f8 100644
--- a/compiler/GHC/StgToCmm/Heap.hs
+++ b/compiler/GHC/StgToCmm/Heap.hs
@@ -23,7 +23,7 @@ module GHC.StgToCmm.Heap (
 import GhcPrelude hiding ((<*>))
 
 import GHC.Stg.Syntax
-import CLabel
+import GHC.Cmm.CLabel
 import GHC.StgToCmm.Layout
 import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Monad
@@ -32,13 +32,13 @@ import GHC.StgToCmm.Ticky
 import GHC.StgToCmm.Closure
 import GHC.StgToCmm.Env
 
-import MkGraph
+import GHC.Cmm.Graph
 
-import Hoopl.Label
-import SMRep
-import BlockId
-import Cmm
-import CmmUtils
+import GHC.Cmm.Dataflow.Label
+import GHC.Runtime.Layout
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Utils
 import CostCentre
 import IdInfo( CafInfo(..), mayHaveCafRefs )
 import Id ( Id )
@@ -337,7 +337,7 @@ entryHeapCheck cl_info nodeSet arity args code
                  Just (_, ArgGen _) -> False
                  _otherwise         -> True
 
--- | lower-level version for CmmParse
+-- | lower-level version for GHC.Cmm.Parser
 entryHeapCheck' :: Bool           -- is a known function pattern
                 -> CmmExpr        -- expression for the closure pointer
                 -> Int            -- Arity -- not same as len args b/c of voids
diff --git a/compiler/GHC/StgToCmm/Hpc.hs b/compiler/GHC/StgToCmm/Hpc.hs
index e33d39245c..a3f4112206 100644
--- a/compiler/GHC/StgToCmm/Hpc.hs
+++ b/compiler/GHC/StgToCmm/Hpc.hs
@@ -12,11 +12,11 @@ import GhcPrelude
 
 import GHC.StgToCmm.Monad
 
-import MkGraph
-import CmmExpr
-import CLabel
+import GHC.Cmm.Graph
+import GHC.Cmm.Expr
+import GHC.Cmm.CLabel
 import Module
-import CmmUtils
+import GHC.Cmm.Utils
 import GHC.StgToCmm.Utils
 import HscTypes
 import DynFlags
diff --git a/compiler/GHC/StgToCmm/Layout.hs b/compiler/GHC/StgToCmm/Layout.hs
index 6d7825eb93..e78221de3a 100644
--- a/compiler/GHC/StgToCmm/Layout.hs
+++ b/compiler/GHC/StgToCmm/Layout.hs
@@ -41,13 +41,13 @@ import GHC.StgToCmm.Ticky
 import GHC.StgToCmm.Monad
 import GHC.StgToCmm.Utils
 
-import MkGraph
-import SMRep
-import BlockId
-import Cmm
-import CmmUtils
-import CmmInfo
-import CLabel
+import GHC.Cmm.Graph
+import GHC.Runtime.Layout
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Info
+import GHC.Cmm.CLabel
 import GHC.Stg.Syntax
 import Id
 import TyCon             ( PrimRep(..), primRepSizeB )
diff --git a/compiler/GHC/StgToCmm/Monad.hs b/compiler/GHC/StgToCmm/Monad.hs
index 716cbdab78..4f7d2e1220 100644
--- a/compiler/GHC/StgToCmm/Monad.hs
+++ b/compiler/GHC/StgToCmm/Monad.hs
@@ -61,14 +61,14 @@ module GHC.StgToCmm.Monad (
 
 import GhcPrelude hiding( sequence, succ )
 
-import Cmm
+import GHC.Cmm
 import GHC.StgToCmm.Closure
 import DynFlags
-import Hoopl.Collections
-import MkGraph
-import BlockId
-import CLabel
-import SMRep
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Graph as CmmGraph
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Runtime.Layout
 import Module
 import Id
 import VarEnv
@@ -369,7 +369,7 @@ addCodeBlocksFrom :: CgState -> CgState -> CgState
 -- Add code blocks from the latter to the former
 -- (The cgs_stmts will often be empty, but not always; see codeOnly)
 s1 `addCodeBlocksFrom` s2
-  = s1 { cgs_stmts = cgs_stmts s1 MkGraph.<*> cgs_stmts s2,
+  = s1 { cgs_stmts = cgs_stmts s1 CmmGraph.<*> cgs_stmts s2,
          cgs_tops  = cgs_tops  s1 `appOL` cgs_tops  s2 }
 
 
@@ -715,7 +715,7 @@ emitStore l r = emitCgStmt (CgStmt (CmmStore l r))
 emit :: CmmAGraph -> FCode ()
 emit ag
   = do  { state <- getState
-        ; setState $ state { cgs_stmts = cgs_stmts state MkGraph.<*> ag } }
+        ; setState $ state { cgs_stmts = cgs_stmts state CmmGraph.<*> ag } }
 
 emitDecl :: CmmDecl -> FCode ()
 emitDecl decl
@@ -743,7 +743,7 @@ emitProcWithStackFrame conv mb_info lbl stk_args args (graph, tscope) True
         -- do layout
   = do  { dflags <- getDynFlags
         ; let (offset, live, entry) = mkCallEntry dflags conv args stk_args
-              graph' = entry MkGraph.<*> graph
+              graph' = entry CmmGraph.<*> graph
         ; emitProc mb_info lbl live (graph', tscope) offset True
         }
 emitProcWithStackFrame _ _ _ _ _ _ _ = panic "emitProcWithStackFrame"
diff --git a/compiler/GHC/StgToCmm/Prim.hs b/compiler/GHC/StgToCmm/Prim.hs
index e469e15a5d..06264099df 100644
--- a/compiler/GHC/StgToCmm/Prim.hs
+++ b/compiler/GHC/StgToCmm/Prim.hs
@@ -36,17 +36,17 @@ import GHC.StgToCmm.Prof ( costCentreFrom )
 import DynFlags
 import GHC.Platform
 import BasicTypes
-import BlockId
-import MkGraph
+import GHC.Cmm.BlockId
+import GHC.Cmm.Graph
 import GHC.Stg.Syntax
-import Cmm
+import GHC.Cmm
 import Module   ( rtsUnitId )
 import Type     ( Type, tyConAppTyCon )
 import TyCon
-import CLabel
-import CmmUtils
+import GHC.Cmm.CLabel
+import GHC.Cmm.Utils
 import PrimOp
-import SMRep
+import GHC.Runtime.Layout
 import FastString
 import Outputable
 import Util
@@ -1525,7 +1525,7 @@ emitPrimOp dflags = \case
   -- `quot` and `rem` with constant divisor can be implemented with fast bit-ops
   -- (shift, .&.).
   --
-  -- Currently we only support optimization (performed in CmmOpt) when the
+  -- Currently we only support optimization (performed in GHC.Cmm.Opt) when the
   -- constant is a power of 2. #9041 tracks the implementation of the general
   -- optimization.
   --
diff --git a/compiler/GHC/StgToCmm/Prof.hs b/compiler/GHC/StgToCmm/Prof.hs
index 4743b79622..cf5ce5acfb 100644
--- a/compiler/GHC/StgToCmm/Prof.hs
+++ b/compiler/GHC/StgToCmm/Prof.hs
@@ -28,12 +28,12 @@ import GhcPrelude
 import GHC.StgToCmm.Closure
 import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Monad
-import SMRep
+import GHC.Runtime.Layout
 
-import MkGraph
-import Cmm
-import CmmUtils
-import CLabel
+import GHC.Cmm.Graph
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
 
 import CostCentre
 import DynFlags
diff --git a/compiler/GHC/StgToCmm/Ticky.hs b/compiler/GHC/StgToCmm/Ticky.hs
index 9eeb134cc9..6e2e2d3a6b 100644
--- a/compiler/GHC/StgToCmm/Ticky.hs
+++ b/compiler/GHC/StgToCmm/Ticky.hs
@@ -23,9 +23,9 @@ Some of the relevant source files:
 
   * some codeGen/ modules import this one
 
-  * this module imports cmm/CLabel.hs to manage labels
+  * this module imports GHC.Cmm.CLabel to manage labels
 
-  * cmm/CmmParse.y expands some macros using generators defined in
+  * GHC.Cmm.Parser expands some macros using generators defined in
     this module
 
   * includes/stg/Ticky.h declares all of the global counters
@@ -112,11 +112,11 @@ import GHC.StgToCmm.Utils
 import GHC.StgToCmm.Monad
 
 import GHC.Stg.Syntax
-import CmmExpr
-import MkGraph
-import CmmUtils
-import CLabel
-import SMRep
+import GHC.Cmm.Expr
+import GHC.Cmm.Graph
+import GHC.Cmm.Utils
+import GHC.Cmm.CLabel
+import GHC.Runtime.Layout
 
 import Module
 import Name
@@ -517,7 +517,7 @@ tickyAllocHeap genuine hp
 
 
 --------------------------------------------------------------------------------
--- these three are only called from CmmParse.y (ie ultimately from the RTS)
+-- these three are only called from GHC.Cmm.Parser (ie ultimately from the RTS)
 
 -- the units are bytes
 
diff --git a/compiler/GHC/StgToCmm/Utils.hs b/compiler/GHC/StgToCmm/Utils.hs
index 34fb93468c..7a784ea85c 100644
--- a/compiler/GHC/StgToCmm/Utils.hs
+++ b/compiler/GHC/StgToCmm/Utils.hs
@@ -52,20 +52,20 @@ import GhcPrelude
 
 import GHC.StgToCmm.Monad
 import GHC.StgToCmm.Closure
-import Cmm
-import BlockId
-import MkGraph
+import GHC.Cmm
+import GHC.Cmm.BlockId
+import GHC.Cmm.Graph as CmmGraph
 import GHC.Platform.Regs
-import CLabel
-import CmmUtils
-import CmmSwitch
+import GHC.Cmm.CLabel
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
 import GHC.StgToCmm.CgUtils
 
 import ForeignCall
 import IdInfo
 import Type
 import TyCon
-import SMRep
+import GHC.Runtime.Layout
 import Module
 import Literal
 import Digraph
@@ -458,8 +458,8 @@ mk_discrete_switch _ _tag_expr [(_tag,lbl)] Nothing _
         -- In that situation we can be sure the (:) case
         -- can't happen, so no need to test
 
--- SOMETHING MORE COMPLICATED: defer to CmmImplementSwitchPlans
--- See Note [Cmm Switches, the general plan] in CmmSwitch
+-- SOMETHING MORE COMPLICATED: defer to GHC.Cmm.Switch.Implement
+-- See Note [Cmm Switches, the general plan] in GHC.Cmm.Switch
 mk_discrete_switch signed tag_expr branches mb_deflt range
   = mkSwitch tag_expr $ mkSwitchTargets signed range mb_deflt (M.fromList branches)
 
@@ -568,7 +568,7 @@ label_code :: BlockId -> CmmAGraphScoped -> FCode BlockId
 -- and returns L
 label_code join_lbl (code,tsc) = do
     lbl <- newBlockId
-    emitOutOfLine lbl (code MkGraph.<*> mkBranch join_lbl, tsc)
+    emitOutOfLine lbl (code CmmGraph.<*> mkBranch join_lbl, tsc)
     return lbl
 
 --------------
diff --git a/compiler/basicTypes/Unique.hs b/compiler/basicTypes/Unique.hs
index 4a646aa70a..f14f22d625 100644
--- a/compiler/basicTypes/Unique.hs
+++ b/compiler/basicTypes/Unique.hs
@@ -276,7 +276,7 @@ The alternatives are:
      is controlled. See Module.ModuleEnv
   3) Change the algorithm to use nonDetCmpUnique and document why it's still
      deterministic
-  4) Use TrieMap as done in CmmCommonBlockElim.groupByLabel
+  4) Use TrieMap as done in GHC.Cmm.CommonBlockElim.groupByLabel
 -}
 
 instance Eq Unique where
diff --git a/compiler/cmm/BlockId.hs-boot b/compiler/cmm/BlockId.hs-boot
deleted file mode 100644
index 3ad4141184..0000000000
--- a/compiler/cmm/BlockId.hs-boot
+++ /dev/null
@@ -1,8 +0,0 @@
-module BlockId (BlockId, mkBlockId) where
-
-import Hoopl.Label (Label)
-import Unique (Unique)
-
-type BlockId = Label
-
-mkBlockId :: Unique -> BlockId
diff --git a/compiler/deSugar/Coverage.hs b/compiler/deSugar/Coverage.hs
index 75eeb07570..d94f640f84 100644
--- a/compiler/deSugar/Coverage.hs
+++ b/compiler/deSugar/Coverage.hs
@@ -41,7 +41,7 @@ import TyCon
 import BasicTypes
 import MonadUtils
 import Maybes
-import CLabel
+import GHC.Cmm.CLabel
 import Util
 
 import Data.Time
diff --git a/compiler/deSugar/DsForeign.hs b/compiler/deSugar/DsForeign.hs
index 0a3755e94b..cdf58e709e 100644
--- a/compiler/deSugar/DsForeign.hs
+++ b/compiler/deSugar/DsForeign.hs
@@ -37,8 +37,8 @@ import Coercion
 import TcEnv
 import TcType
 
-import CmmExpr
-import CmmUtils
+import GHC.Cmm.Expr
+import GHC.Cmm.Utils
 import HscTypes
 import ForeignCall
 import TysWiredIn
diff --git a/compiler/ghc.cabal.in b/compiler/ghc.cabal.in
index 640f325c03..ddcf2aeacb 100644
--- a/compiler/ghc.cabal.in
+++ b/compiler/ghc.cabal.in
@@ -203,7 +203,7 @@ Library
         DataCon
         PatSyn
         Demand
-        Debug
+        GHC.Cmm.DebugBlock
         Exception
         FieldLabel
         GhcMonad
@@ -240,42 +240,42 @@ Library
         VarEnv
         VarSet
         UnVarGraph
-        BlockId
-        CLabel
-        Cmm
-        CmmBuildInfoTables
-        CmmPipeline
-        CmmCallConv
-        CmmCommonBlockElim
-        CmmImplementSwitchPlans
-        CmmContFlowOpt
-        CmmExpr
-        CmmInfo
-        CmmLex
-        CmmLint
-        CmmLive
-        CmmMachOp
-        CmmMonad
-        CmmSwitch
-        CmmNode
-        CmmOpt
-        CmmParse
-        CmmProcPoint
-        CmmSink
-        CmmType
-        CmmUtils
-        CmmLayoutStack
+        GHC.Cmm.BlockId
+        GHC.Cmm.CLabel
+        GHC.Cmm
+        GHC.Cmm.Info.Build
+        GHC.Cmm.Pipeline
+        GHC.Cmm.CallConv
+        GHC.Cmm.CommonBlockElim
+        GHC.Cmm.Switch.Implement
+        GHC.Cmm.ContFlowOpt
+        GHC.Cmm.Expr
+        GHC.Cmm.Info
+        GHC.Cmm.Lexer
+        GHC.Cmm.Lint
+        GHC.Cmm.Liveness
+        GHC.Cmm.MachOp
+        GHC.Cmm.Monad
+        GHC.Cmm.Switch
+        GHC.Cmm.Node
+        GHC.Cmm.Opt
+        GHC.Cmm.Parser
+        GHC.Cmm.ProcPoint
+        GHC.Cmm.Sink
+        GHC.Cmm.Type
+        GHC.Cmm.Utils
+        GHC.Cmm.LayoutStack
         CliOption
         EnumSet
         GhcNameVersion
         FileSettings
-        MkGraph
+        GHC.Cmm.Graph
         PprBase
-        PprC
-        PprCmm
-        PprCmmDecl
-        PprCmmExpr
-        Bitmap
+        GHC.CmmToC
+        GHC.Cmm.Ppr
+        GHC.Cmm.Ppr.Decl
+        GHC.Cmm.Ppr.Expr
+        GHC.Data.Bitmap
         GHC.Platform.Regs
         GHC.Platform.ARM
         GHC.Platform.ARM64
@@ -303,7 +303,7 @@ Library
         GHC.StgToCmm.Ticky
         GHC.StgToCmm.Utils
         GHC.StgToCmm.ExtCode
-        SMRep
+        GHC.Runtime.Layout
         CoreArity
         CoreFVs
         CoreLint
@@ -576,11 +576,11 @@ Library
         UniqMap
         UniqSet
         Util
-        Hoopl.Block
-        Hoopl.Collections
-        Hoopl.Dataflow
-        Hoopl.Graph
-        Hoopl.Label
+        GHC.Cmm.Dataflow
+        GHC.Cmm.Dataflow.Block
+        GHC.Cmm.Dataflow.Collections
+        GHC.Cmm.Dataflow.Graph
+        GHC.Cmm.Dataflow.Label
 
     Exposed-Modules:
             AsmCodeGen
diff --git a/compiler/ghci/ByteCodeAsm.hs b/compiler/ghci/ByteCodeAsm.hs
index 82de14346e..801cdc7068 100644
--- a/compiler/ghci/ByteCodeAsm.hs
+++ b/compiler/ghci/ByteCodeAsm.hs
@@ -30,7 +30,7 @@ import Literal
 import TyCon
 import FastString
 import GHC.StgToCmm.Layout     ( ArgRep(..) )
-import SMRep
+import GHC.Runtime.Layout
 import DynFlags
 import Outputable
 import GHC.Platform
diff --git a/compiler/ghci/ByteCodeGen.hs b/compiler/ghci/ByteCodeGen.hs
index 2e24bf540c..186d094bff 100644
--- a/compiler/ghci/ByteCodeGen.hs
+++ b/compiler/ghci/ByteCodeGen.hs
@@ -50,8 +50,8 @@ import FastString
 import Panic
 import GHC.StgToCmm.Closure    ( NonVoid(..), fromNonVoid, nonVoidIds )
 import GHC.StgToCmm.Layout
-import SMRep hiding (WordOff, ByteOff, wordsToBytes)
-import Bitmap
+import GHC.Runtime.Layout hiding (WordOff, ByteOff, wordsToBytes)
+import GHC.Data.Bitmap
 import OrdList
 import Maybes
 import VarEnv
diff --git a/compiler/ghci/ByteCodeInstr.hs b/compiler/ghci/ByteCodeInstr.hs
index b0db198037..9cdd297dbd 100644
--- a/compiler/ghci/ByteCodeInstr.hs
+++ b/compiler/ghci/ByteCodeInstr.hs
@@ -28,7 +28,7 @@ import Literal
 import DataCon
 import VarSet
 import PrimOp
-import SMRep
+import GHC.Runtime.Layout
 
 import Data.Word
 import GHC.Stack.CCS (CostCentre)
diff --git a/compiler/ghci/RtClosureInspect.hs b/compiler/ghci/RtClosureInspect.hs
index 96df8b547c..a523ae07bf 100644
--- a/compiler/ghci/RtClosureInspect.hs
+++ b/compiler/ghci/RtClosureInspect.hs
@@ -58,7 +58,7 @@ import DynFlags
 import Outputable as Ppr
 import GHC.Char
 import GHC.Exts.Heap
-import SMRep ( roundUpTo )
+import GHC.Runtime.Layout ( roundUpTo )
 
 import Control.Monad
 import Data.Maybe
diff --git a/compiler/llvmGen/LlvmCodeGen.hs b/compiler/llvmGen/LlvmCodeGen.hs
index 0fc7e76e58..8bff8fd6e5 100644
--- a/compiler/llvmGen/LlvmCodeGen.hs
+++ b/compiler/llvmGen/LlvmCodeGen.hs
@@ -18,9 +18,9 @@ import LlvmCodeGen.Regs
 import LlvmMangler
 
 import GHC.StgToCmm.CgUtils ( fixStgRegisters )
-import Cmm
-import Hoopl.Collections
-import PprCmm
+import GHC.Cmm
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Ppr
 
 import BufWrite
 import DynFlags
diff --git a/compiler/llvmGen/LlvmCodeGen/Base.hs b/compiler/llvmGen/LlvmCodeGen/Base.hs
index ce9f22052f..165f733af4 100644
--- a/compiler/llvmGen/LlvmCodeGen/Base.hs
+++ b/compiler/llvmGen/LlvmCodeGen/Base.hs
@@ -44,12 +44,12 @@ import GhcPrelude
 import Llvm
 import LlvmCodeGen.Regs
 
-import CLabel
+import GHC.Cmm.CLabel
 import GHC.Platform.Regs ( activeStgRegs )
 import DynFlags
 import FastString
-import Cmm              hiding ( succ )
-import CmmUtils ( regsOverlap )
+import GHC.Cmm              hiding ( succ )
+import GHC.Cmm.Utils (regsOverlap)
 import Outputable as Outp
 import GHC.Platform
 import UniqFM
diff --git a/compiler/llvmGen/LlvmCodeGen/CodeGen.hs b/compiler/llvmGen/LlvmCodeGen/CodeGen.hs
index bfaf7706d1..f9b10679ef 100644
--- a/compiler/llvmGen/LlvmCodeGen/CodeGen.hs
+++ b/compiler/llvmGen/LlvmCodeGen/CodeGen.hs
@@ -13,16 +13,16 @@ import Llvm
 import LlvmCodeGen.Base
 import LlvmCodeGen.Regs
 
-import BlockId
+import GHC.Cmm.BlockId
 import GHC.Platform.Regs ( activeStgRegs )
-import CLabel
-import Cmm
-import PprCmm
-import CmmUtils
-import CmmSwitch
-import Hoopl.Block
-import Hoopl.Graph
-import Hoopl.Collections
+import GHC.Cmm.CLabel
+import GHC.Cmm
+import GHC.Cmm.Ppr as PprCmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Collections
 
 import DynFlags
 import FastString
diff --git a/compiler/llvmGen/LlvmCodeGen/Data.hs b/compiler/llvmGen/LlvmCodeGen/Data.hs
index 4c07f8ee8f..46fb1afbcd 100644
--- a/compiler/llvmGen/LlvmCodeGen/Data.hs
+++ b/compiler/llvmGen/LlvmCodeGen/Data.hs
@@ -14,9 +14,9 @@ import GhcPrelude
 import Llvm
 import LlvmCodeGen.Base
 
-import BlockId
-import CLabel
-import Cmm
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm
 import DynFlags
 import GHC.Platform
 
diff --git a/compiler/llvmGen/LlvmCodeGen/Ppr.hs b/compiler/llvmGen/LlvmCodeGen/Ppr.hs
index 3f29133e59..5fcc72f25a 100644
--- a/compiler/llvmGen/LlvmCodeGen/Ppr.hs
+++ b/compiler/llvmGen/LlvmCodeGen/Ppr.hs
@@ -15,8 +15,8 @@ import Llvm
 import LlvmCodeGen.Base
 import LlvmCodeGen.Data
 
-import CLabel
-import Cmm
+import GHC.Cmm.CLabel
+import GHC.Cmm
 
 import FastString
 import Outputable
diff --git a/compiler/llvmGen/LlvmCodeGen/Regs.hs b/compiler/llvmGen/LlvmCodeGen/Regs.hs
index 8cdf3c6869..4b1a15674e 100644
--- a/compiler/llvmGen/LlvmCodeGen/Regs.hs
+++ b/compiler/llvmGen/LlvmCodeGen/Regs.hs
@@ -15,7 +15,7 @@ import GhcPrelude
 
 import Llvm
 
-import CmmExpr
+import GHC.Cmm.Expr
 import DynFlags
 import FastString
 import Outputable ( panic )
diff --git a/compiler/main/CodeOutput.hs b/compiler/main/CodeOutput.hs
index 2b9770c78e..6656a4f4d8 100644
--- a/compiler/main/CodeOutput.hs
+++ b/compiler/main/CodeOutput.hs
@@ -18,10 +18,10 @@ import LlvmCodeGen      ( llvmCodeGen )
 import UniqSupply       ( mkSplitUniqSupply )
 
 import Finder           ( mkStubPaths )
-import PprC             ( writeC )
-import CmmLint          ( cmmLint )
+import GHC.CmmToC             ( writeC )
+import GHC.Cmm.Lint          ( cmmLint )
 import Packages
-import Cmm              ( RawCmmGroup )
+import GHC.Cmm              ( RawCmmGroup )
 import HscTypes
 import DynFlags
 import Stream           ( Stream )
diff --git a/compiler/main/Hooks.hs b/compiler/main/Hooks.hs
index d5ced7d5a0..8caebfc556 100644
--- a/compiler/main/Hooks.hs
+++ b/compiler/main/Hooks.hs
@@ -50,7 +50,7 @@ import TyCon
 import CostCentre
 import GHC.Stg.Syntax
 import Stream
-import Cmm
+import GHC.Cmm
 import GHC.Hs.Extension
 
 import Data.Maybe
diff --git a/compiler/main/HscMain.hs b/compiler/main/HscMain.hs
index ffb9b3ced9..1c27542270 100644
--- a/compiler/main/HscMain.hs
+++ b/compiler/main/HscMain.hs
@@ -133,11 +133,11 @@ import CostCentre
 import ProfInit
 import TyCon
 import Name
-import Cmm
-import CmmParse         ( parseCmmFile )
-import CmmBuildInfoTables
-import CmmPipeline
-import CmmInfo
+import GHC.Cmm
+import GHC.Cmm.Parser         ( parseCmmFile )
+import GHC.Cmm.Info.Build
+import GHC.Cmm.Pipeline
+import GHC.Cmm.Info
 import CodeOutput
 import InstEnv
 import FamInstEnv
diff --git a/compiler/main/StaticPtrTable.hs b/compiler/main/StaticPtrTable.hs
index 4f67ba0190..dfc54799d7 100644
--- a/compiler/main/StaticPtrTable.hs
+++ b/compiler/main/StaticPtrTable.hs
@@ -124,7 +124,7 @@ Here is a running example:
 
 import GhcPrelude
 
-import CLabel
+import GHC.Cmm.CLabel
 import CoreSyn
 import CoreUtils (collectMakeStaticArgs)
 import DataCon
diff --git a/compiler/nativeGen/AsmCodeGen.hs b/compiler/nativeGen/AsmCodeGen.hs
index 556c943dc2..021fbae195 100644
--- a/compiler/nativeGen/AsmCodeGen.hs
+++ b/compiler/nativeGen/AsmCodeGen.hs
@@ -67,18 +67,18 @@ import Reg
 import NCGMonad
 import CFG
 import Dwarf
-import Debug
+import GHC.Cmm.DebugBlock
 
-import BlockId
+import GHC.Cmm.BlockId
 import GHC.StgToCmm.CgUtils ( fixStgRegisters )
-import Cmm
-import CmmUtils
-import Hoopl.Collections
-import Hoopl.Label
-import Hoopl.Block
-import CmmOpt           ( cmmMachOpFold )
-import PprCmm
-import CLabel
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Opt           ( cmmMachOpFold )
+import GHC.Cmm.Ppr
+import GHC.Cmm.CLabel
 
 import UniqFM
 import UniqSupply
@@ -826,7 +826,7 @@ computeUnwinding _ ncgImpl (CmmProc _ _ _ (ListGraph blks)) =
     -- relevant register writes within a procedure.
     --
     -- However, the only unwinding information that we care about in GHC is for
-    -- Sp. The fact that CmmLayoutStack already ensures that we have unwind
+    -- Sp. The fact that GHC.Cmm.LayoutStack already ensures that we have unwind
     -- information at the beginning of every block means that there is no need
     -- to perform this sort of push-down.
     mapFromList [ (blk_lbl, extractUnwindPoints ncgImpl instrs)
diff --git a/compiler/nativeGen/BlockLayout.hs b/compiler/nativeGen/BlockLayout.hs
index 5e81316ab3..3f74065e4e 100644
--- a/compiler/nativeGen/BlockLayout.hs
+++ b/compiler/nativeGen/BlockLayout.hs
@@ -20,10 +20,10 @@ import Instruction
 import NCGMonad
 import CFG
 
-import BlockId
-import Cmm
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 
 import DynFlags (gopt, GeneralFlag(..), DynFlags, backendMaintainsCfg)
 import UniqFM
@@ -35,7 +35,7 @@ import Outputable
 import Maybes
 
 -- DEBUGGING ONLY
---import Debug
+--import GHC.Cmm.DebugBlock
 --import Debug.Trace
 import ListSetOps (removeDups)
 
diff --git a/compiler/nativeGen/CFG.hs b/compiler/nativeGen/CFG.hs
index 4dc5f9ccb3..90573221f8 100644
--- a/compiler/nativeGen/CFG.hs
+++ b/compiler/nativeGen/CFG.hs
@@ -46,15 +46,15 @@ where
 
 import GhcPrelude
 
-import BlockId
-import Cmm
+import GHC.Cmm.BlockId
+import GHC.Cmm as Cmm
 
-import CmmUtils
-import CmmSwitch
-import Hoopl.Collections
-import Hoopl.Label
-import Hoopl.Block
-import qualified Hoopl.Graph as G
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Block
+import qualified GHC.Cmm.Dataflow.Graph as G
 
 import Util
 import Digraph
@@ -74,11 +74,10 @@ import Data.Bifunctor
 
 import Outputable
 -- DEBUGGING ONLY
---import Debug
--- import Debug.Trace
+--import GHC.Cmm.DebugBlock
 --import OrdList
---import Debug.Trace
-import PprCmm () -- For Outputable instances
+--import GHC.Cmm.DebugBlock.Trace
+import GHC.Cmm.Ppr () -- For Outputable instances
 import qualified DynFlags as D
 
 import Data.List
@@ -250,7 +249,7 @@ filterEdges f cfg =
 {- Note [Updating the CFG during shortcutting]
 
 See Note [What is shortcutting] in the control flow optimization
-code (CmmContFlowOpt.hs) for a slightly more in depth explanation on shortcutting.
+code (GHC.Cmm.ContFlowOpt) for a slightly more in depth explanation on shortcutting.
 
 In the native backend we shortcut jumps at the assembly level. (AsmCodeGen.hs)
 This means we remove blocks containing only one jump from the code
diff --git a/compiler/nativeGen/CPrim.hs b/compiler/nativeGen/CPrim.hs
index 17e5cda845..344e62d53c 100644
--- a/compiler/nativeGen/CPrim.hs
+++ b/compiler/nativeGen/CPrim.hs
@@ -16,8 +16,8 @@ module CPrim
 
 import GhcPrelude
 
-import CmmType
-import CmmMachOp
+import GHC.Cmm.Type
+import GHC.Cmm.MachOp
 import Outputable
 
 popCntLabel :: Width -> String
diff --git a/compiler/nativeGen/Dwarf.hs b/compiler/nativeGen/Dwarf.hs
index 33f1c5b2f7..a64df287f5 100644
--- a/compiler/nativeGen/Dwarf.hs
+++ b/compiler/nativeGen/Dwarf.hs
@@ -4,11 +4,11 @@ module Dwarf (
 
 import GhcPrelude
 
-import CLabel
-import CmmExpr         ( GlobalReg(..) )
+import GHC.Cmm.CLabel
+import GHC.Cmm.Expr    ( GlobalReg(..) )
 import Config          ( cProjectName, cProjectVersion )
 import CoreSyn         ( Tickish(..) )
-import Debug
+import GHC.Cmm.DebugBlock
 import DynFlags
 import Module
 import Outputable
@@ -28,8 +28,8 @@ import qualified Data.Map as Map
 import System.FilePath
 import System.Directory ( getCurrentDirectory )
 
-import qualified Hoopl.Label as H
-import qualified Hoopl.Collections as H
+import qualified GHC.Cmm.Dataflow.Label as H
+import qualified GHC.Cmm.Dataflow.Collections as H
 
 -- | Generate DWARF/debug information
 dwarfGen :: DynFlags -> ModLocation -> UniqSupply -> [DebugBlock]
diff --git a/compiler/nativeGen/Dwarf/Types.hs b/compiler/nativeGen/Dwarf/Types.hs
index a6ba596f35..df578e2671 100644
--- a/compiler/nativeGen/Dwarf/Types.hs
+++ b/compiler/nativeGen/Dwarf/Types.hs
@@ -24,9 +24,9 @@ module Dwarf.Types
 
 import GhcPrelude
 
-import Debug
-import CLabel
-import CmmExpr         ( GlobalReg(..) )
+import GHC.Cmm.DebugBlock
+import GHC.Cmm.CLabel
+import GHC.Cmm.Expr         ( GlobalReg(..) )
 import Encoding
 import FastString
 import Outputable
diff --git a/compiler/nativeGen/Format.hs b/compiler/nativeGen/Format.hs
index 745d1e7b65..d7b6f6b868 100644
--- a/compiler/nativeGen/Format.hs
+++ b/compiler/nativeGen/Format.hs
@@ -22,7 +22,7 @@ where
 
 import GhcPrelude
 
-import Cmm
+import GHC.Cmm
 import Outputable
 
 -- It looks very like the old MachRep, but it's now of purely local
diff --git a/compiler/nativeGen/Instruction.hs b/compiler/nativeGen/Instruction.hs
index 4f18a45c16..150bd8adba 100644
--- a/compiler/nativeGen/Instruction.hs
+++ b/compiler/nativeGen/Instruction.hs
@@ -18,11 +18,11 @@ import GhcPrelude
 
 import Reg
 
-import BlockId
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 import DynFlags
-import Cmm hiding (topInfoTable)
+import GHC.Cmm hiding (topInfoTable)
 import GHC.Platform
 
 -- | Holds a list of source and destination registers used by a
diff --git a/compiler/nativeGen/NCGMonad.hs b/compiler/nativeGen/NCGMonad.hs
index e1bb927d0b..b963623535 100644
--- a/compiler/nativeGen/NCGMonad.hs
+++ b/compiler/nativeGen/NCGMonad.hs
@@ -49,11 +49,11 @@ import Reg
 import Format
 import TargetReg
 
-import BlockId
-import Hoopl.Collections
-import Hoopl.Label
-import CLabel           ( CLabel )
-import Debug
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.CLabel           ( CLabel )
+import GHC.Cmm.DebugBlock
 import FastString       ( FastString )
 import UniqFM
 import UniqSupply
@@ -65,7 +65,7 @@ import Control.Monad    ( ap )
 
 import Instruction
 import Outputable (SDoc, pprPanic, ppr)
-import Cmm (RawCmmDecl, CmmStatics)
+import GHC.Cmm (RawCmmDecl, CmmStatics)
 import CFG
 
 data NcgImpl statics instr jumpDest = NcgImpl {
diff --git a/compiler/nativeGen/PIC.hs b/compiler/nativeGen/PIC.hs
index 760ba7925d..e4aba00596 100644
--- a/compiler/nativeGen/PIC.hs
+++ b/compiler/nativeGen/PIC.hs
@@ -60,14 +60,14 @@ import Reg
 import NCGMonad
 
 
-import Hoopl.Collections
-import Cmm
-import CLabel           ( CLabel, ForeignLabelSource(..), pprCLabel,
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm
+import GHC.Cmm.CLabel           ( CLabel, ForeignLabelSource(..), pprCLabel,
                           mkDynamicLinkerLabel, DynamicLinkerLabelInfo(..),
                           dynamicLinkerLabelInfo, mkPicBaseLabel,
                           labelDynamic, externallyVisibleCLabel )
 
-import CLabel           ( mkForeignLabel )
+import GHC.Cmm.CLabel           ( mkForeignLabel )
 
 
 import BasicTypes
diff --git a/compiler/nativeGen/PPC/CodeGen.hs b/compiler/nativeGen/PPC/CodeGen.hs
index e669630956..4d9a38b9de 100644
--- a/compiler/nativeGen/PPC/CodeGen.hs
+++ b/compiler/nativeGen/PPC/CodeGen.hs
@@ -42,14 +42,14 @@ import TargetReg
 import GHC.Platform
 
 -- Our intermediate code:
-import BlockId
-import PprCmm           ( pprExpr )
-import Cmm
-import CmmUtils
-import CmmSwitch
-import CLabel
-import Hoopl.Block
-import Hoopl.Graph
+import GHC.Cmm.BlockId
+import GHC.Cmm.Ppr           ( pprExpr )
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
+import GHC.Cmm.CLabel
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
 
 -- The rest:
 import OrdList
diff --git a/compiler/nativeGen/PPC/Instr.hs b/compiler/nativeGen/PPC/Instr.hs
index 69aa954485..d19282fee6 100644
--- a/compiler/nativeGen/PPC/Instr.hs
+++ b/compiler/nativeGen/PPC/Instr.hs
@@ -33,14 +33,14 @@ import RegClass
 import Reg
 
 import GHC.Platform.Regs
-import BlockId
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 import DynFlags
-import Cmm
-import CmmInfo
+import GHC.Cmm
+import GHC.Cmm.Info
 import FastString
-import CLabel
+import GHC.Cmm.CLabel
 import Outputable
 import GHC.Platform
 import UniqFM (listToUFM, lookupUFM)
diff --git a/compiler/nativeGen/PPC/Ppr.hs b/compiler/nativeGen/PPC/Ppr.hs
index ea0b36fb64..9669076bef 100644
--- a/compiler/nativeGen/PPC/Ppr.hs
+++ b/compiler/nativeGen/PPC/Ppr.hs
@@ -21,13 +21,13 @@ import Reg
 import RegClass
 import TargetReg
 
-import Cmm hiding (topInfoTable)
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm hiding (topInfoTable)
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 
-import BlockId
-import CLabel
-import PprCmmExpr () -- For Outputable instances
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm.Ppr.Expr () -- For Outputable instances
 
 import Unique                ( pprUniqueAlways, getUnique )
 import GHC.Platform
diff --git a/compiler/nativeGen/PPC/RegInfo.hs b/compiler/nativeGen/PPC/RegInfo.hs
index 5ed0ccded3..e99a69313e 100644
--- a/compiler/nativeGen/PPC/RegInfo.hs
+++ b/compiler/nativeGen/PPC/RegInfo.hs
@@ -23,9 +23,9 @@ import GhcPrelude
 
 import PPC.Instr
 
-import BlockId
-import Cmm
-import CLabel
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.CLabel
 
 import Unique
 import Outputable (ppr, text, Outputable, (<>))
diff --git a/compiler/nativeGen/PPC/Regs.hs b/compiler/nativeGen/PPC/Regs.hs
index b0087901a8..66aa006311 100644
--- a/compiler/nativeGen/PPC/Regs.hs
+++ b/compiler/nativeGen/PPC/Regs.hs
@@ -55,8 +55,8 @@ import Reg
 import RegClass
 import Format
 
-import Cmm
-import CLabel           ( CLabel )
+import GHC.Cmm
+import GHC.Cmm.CLabel           ( CLabel )
 import Unique
 
 import GHC.Platform.Regs
diff --git a/compiler/nativeGen/PprBase.hs b/compiler/nativeGen/PprBase.hs
index 48e9e26ae4..c5574b35f0 100644
--- a/compiler/nativeGen/PprBase.hs
+++ b/compiler/nativeGen/PprBase.hs
@@ -23,8 +23,8 @@ where
 import GhcPrelude
 
 import AsmUtils
-import CLabel
-import Cmm
+import GHC.Cmm.CLabel
+import GHC.Cmm
 import DynFlags
 import FastString
 import Outputable
diff --git a/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs b/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs
index 5ca2412c73..f42ff9450a 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Coalesce.hs
@@ -9,7 +9,7 @@ import RegAlloc.Liveness
 import Instruction
 import Reg
 
-import Cmm
+import GHC.Cmm
 import Bag
 import Digraph
 import UniqFM
diff --git a/compiler/nativeGen/RegAlloc/Graph/Spill.hs b/compiler/nativeGen/RegAlloc/Graph/Spill.hs
index 22a88c02c0..9ffb51ee29 100644
--- a/compiler/nativeGen/RegAlloc/Graph/Spill.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/Spill.hs
@@ -12,9 +12,9 @@ import GhcPrelude
 import RegAlloc.Liveness
 import Instruction
 import Reg
-import Cmm hiding (RegSet)
-import BlockId
-import Hoopl.Collections
+import GHC.Cmm hiding (RegSet)
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
 
 import MonadUtils
 import State
diff --git a/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs b/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs
index 79dbf63a66..bd8b449cbb 100644
--- a/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/SpillClean.hs
@@ -35,15 +35,15 @@ import RegAlloc.Liveness
 import Instruction
 import Reg
 
-import BlockId
-import Cmm
+import GHC.Cmm.BlockId
+import GHC.Cmm
 import UniqSet
 import UniqFM
 import Unique
 import State
 import Outputable
 import GHC.Platform
-import Hoopl.Collections
+import GHC.Cmm.Dataflow.Collections
 
 import Data.List
 import Data.Maybe
diff --git a/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs b/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs
index 42de5503ba..4870bf5269 100644
--- a/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs
+++ b/compiler/nativeGen/RegAlloc/Graph/SpillCost.hs
@@ -22,9 +22,9 @@ import Reg
 
 import GraphBase
 
-import Hoopl.Collections (mapLookup)
-import Hoopl.Label
-import Cmm
+import GHC.Cmm.Dataflow.Collections (mapLookup)
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm
 import UniqFM
 import UniqSet
 import Digraph          (flattenSCCs)
diff --git a/compiler/nativeGen/RegAlloc/Linear/Base.hs b/compiler/nativeGen/RegAlloc/Linear/Base.hs
index ad0fafb3ed..3c6965c1dd 100644
--- a/compiler/nativeGen/RegAlloc/Linear/Base.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/Base.hs
@@ -28,7 +28,7 @@ import Outputable
 import Unique
 import UniqFM
 import UniqSupply
-import BlockId
+import GHC.Cmm.BlockId
 
 
 -- | Used to store the register assignment on entry to a basic block.
diff --git a/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs b/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs
index 546d48af21..c21ab1bea1 100644
--- a/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/JoinToTargets.hs
@@ -18,8 +18,8 @@ import RegAlloc.Liveness
 import Instruction
 import Reg
 
-import BlockId
-import Hoopl.Collections
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
 import Digraph
 import DynFlags
 import Outputable
diff --git a/compiler/nativeGen/RegAlloc/Linear/Main.hs b/compiler/nativeGen/RegAlloc/Linear/Main.hs
index eac9194c6a..bccffb208c 100644
--- a/compiler/nativeGen/RegAlloc/Linear/Main.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/Main.hs
@@ -119,9 +119,9 @@ import RegAlloc.Liveness
 import Instruction
 import Reg
 
-import BlockId
-import Hoopl.Collections
-import Cmm hiding (RegSet)
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm hiding (RegSet)
 
 import Digraph
 import DynFlags
@@ -777,7 +777,7 @@ allocateRegsAndSpill reading keep spills alloc (r:rs)
                    -- NOTE: if the input to the NCG contains some
                    -- unreachable blocks with junk code, this panic
                    -- might be triggered.  Make sure you only feed
-                   -- sensible code into the NCG.  In CmmPipeline we
+                   -- sensible code into the NCG.  In GHC.Cmm.Pipeline we
                    -- call removeUnreachableBlocks at the end for this
                    -- reason.
 
diff --git a/compiler/nativeGen/RegAlloc/Linear/State.hs b/compiler/nativeGen/RegAlloc/Linear/State.hs
index 43b8f6c129..d24690f04c 100644
--- a/compiler/nativeGen/RegAlloc/Linear/State.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/State.hs
@@ -44,7 +44,7 @@ import RegAlloc.Linear.Base
 import RegAlloc.Liveness
 import Instruction
 import Reg
-import BlockId
+import GHC.Cmm.BlockId
 
 import DynFlags
 import Unique
diff --git a/compiler/nativeGen/RegAlloc/Liveness.hs b/compiler/nativeGen/RegAlloc/Liveness.hs
index a5a9b503cd..c39ee4895a 100644
--- a/compiler/nativeGen/RegAlloc/Liveness.hs
+++ b/compiler/nativeGen/RegAlloc/Liveness.hs
@@ -40,11 +40,11 @@ import GhcPrelude
 import Reg
 import Instruction
 
-import BlockId
+import GHC.Cmm.BlockId
 import CFG
-import Hoopl.Collections
-import Hoopl.Label
-import Cmm hiding (RegSet, emptyRegSet)
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm hiding (RegSet, emptyRegSet)
 
 import Digraph
 import DynFlags
diff --git a/compiler/nativeGen/SPARC/CodeGen.hs b/compiler/nativeGen/SPARC/CodeGen.hs
index 46b29d0a03..d8cda40d1a 100644
--- a/compiler/nativeGen/SPARC/CodeGen.hs
+++ b/compiler/nativeGen/SPARC/CodeGen.hs
@@ -39,15 +39,15 @@ import Format
 import NCGMonad   ( NatM, getNewRegNat, getNewLabelNat )
 
 -- Our intermediate code:
-import BlockId
-import Cmm
-import CmmUtils
-import CmmSwitch
-import Hoopl.Block
-import Hoopl.Graph
+import GHC.Cmm.BlockId
+import GHC.Cmm
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Graph
 import PIC
 import Reg
-import CLabel
+import GHC.Cmm.CLabel
 import CPrim
 
 -- The rest:
diff --git a/compiler/nativeGen/SPARC/CodeGen/Amode.hs b/compiler/nativeGen/SPARC/CodeGen/Amode.hs
index 33e3f535da..5351fc054b 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Amode.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/Amode.hs
@@ -16,7 +16,7 @@ import SPARC.Base
 import NCGMonad
 import Format
 
-import Cmm
+import GHC.Cmm
 
 import OrdList
 
diff --git a/compiler/nativeGen/SPARC/CodeGen/Base.hs b/compiler/nativeGen/SPARC/CodeGen/Base.hs
index 8a2f2f5a08..4497e1bd5d 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Base.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/Base.hs
@@ -24,8 +24,8 @@ import Reg
 
 import GHC.Platform.Regs
 import DynFlags
-import Cmm
-import PprCmmExpr () -- For Outputable instances
+import GHC.Cmm
+import GHC.Cmm.Ppr.Expr () -- For Outputable instances
 import GHC.Platform
 
 import Outputable
diff --git a/compiler/nativeGen/SPARC/CodeGen/CondCode.hs b/compiler/nativeGen/SPARC/CodeGen/CondCode.hs
index e6b2e174b6..892cbb1a8f 100644
--- a/compiler/nativeGen/SPARC/CodeGen/CondCode.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/CondCode.hs
@@ -18,7 +18,7 @@ import SPARC.Base
 import NCGMonad
 import Format
 
-import Cmm
+import GHC.Cmm
 
 import OrdList
 import Outputable
diff --git a/compiler/nativeGen/SPARC/CodeGen/Expand.hs b/compiler/nativeGen/SPARC/CodeGen/Expand.hs
index 237311956e..ba7577602f 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Expand.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/Expand.hs
@@ -14,7 +14,7 @@ import SPARC.Regs
 import Instruction
 import Reg
 import Format
-import Cmm
+import GHC.Cmm
 
 
 import Outputable
diff --git a/compiler/nativeGen/SPARC/CodeGen/Gen32.hs b/compiler/nativeGen/SPARC/CodeGen/Gen32.hs
index a7a1f60416..a4f6214edc 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Gen32.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/Gen32.hs
@@ -23,7 +23,7 @@ import NCGMonad
 import Format
 import Reg
 
-import Cmm
+import GHC.Cmm
 
 import Control.Monad (liftM)
 import DynFlags
diff --git a/compiler/nativeGen/SPARC/CodeGen/Gen32.hs-boot b/compiler/nativeGen/SPARC/CodeGen/Gen32.hs-boot
index 43632c676d..1dbd2d3612 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Gen32.hs-boot
+++ b/compiler/nativeGen/SPARC/CodeGen/Gen32.hs-boot
@@ -10,7 +10,7 @@ import SPARC.CodeGen.Base
 import NCGMonad
 import Reg
 
-import Cmm
+import GHC.Cmm
 
 getSomeReg  :: CmmExpr -> NatM (Reg, InstrBlock)
 getRegister :: CmmExpr -> NatM Register
diff --git a/compiler/nativeGen/SPARC/CodeGen/Gen64.hs b/compiler/nativeGen/SPARC/CodeGen/Gen64.hs
index 18df9e19a3..a267cd22ab 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Gen64.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/Gen64.hs
@@ -22,7 +22,7 @@ import Instruction
 import Format
 import Reg
 
-import Cmm
+import GHC.Cmm
 
 import DynFlags
 import OrdList
diff --git a/compiler/nativeGen/SPARC/CodeGen/Sanity.hs b/compiler/nativeGen/SPARC/CodeGen/Sanity.hs
index 7f9bfed229..b60c958a73 100644
--- a/compiler/nativeGen/SPARC/CodeGen/Sanity.hs
+++ b/compiler/nativeGen/SPARC/CodeGen/Sanity.hs
@@ -12,7 +12,7 @@ import SPARC.Instr
 import SPARC.Ppr        () -- For Outputable instances
 import Instruction
 
-import Cmm
+import GHC.Cmm
 
 import Outputable
 
diff --git a/compiler/nativeGen/SPARC/Imm.hs b/compiler/nativeGen/SPARC/Imm.hs
index bd2d4ab131..78b6612bbf 100644
--- a/compiler/nativeGen/SPARC/Imm.hs
+++ b/compiler/nativeGen/SPARC/Imm.hs
@@ -9,8 +9,8 @@ where
 
 import GhcPrelude
 
-import Cmm
-import CLabel
+import GHC.Cmm
+import GHC.Cmm.CLabel
 
 import Outputable
 
diff --git a/compiler/nativeGen/SPARC/Instr.hs b/compiler/nativeGen/SPARC/Instr.hs
index c26cfcc4a0..43edfc61f4 100644
--- a/compiler/nativeGen/SPARC/Instr.hs
+++ b/compiler/nativeGen/SPARC/Instr.hs
@@ -38,11 +38,11 @@ import RegClass
 import Reg
 import Format
 
-import CLabel
+import GHC.Cmm.CLabel
 import GHC.Platform.Regs
-import BlockId
+import GHC.Cmm.BlockId
 import DynFlags
-import Cmm
+import GHC.Cmm
 import FastString
 import Outputable
 import GHC.Platform
diff --git a/compiler/nativeGen/SPARC/Ppr.hs b/compiler/nativeGen/SPARC/Ppr.hs
index 5c7d9fabbd..7e40f0d60b 100644
--- a/compiler/nativeGen/SPARC/Ppr.hs
+++ b/compiler/nativeGen/SPARC/Ppr.hs
@@ -37,12 +37,12 @@ import Reg
 import Format
 import PprBase
 
-import Cmm hiding (topInfoTable)
-import PprCmm() -- For Outputable instances
-import BlockId
-import CLabel
-import Hoopl.Label
-import Hoopl.Collections
+import GHC.Cmm hiding (topInfoTable)
+import GHC.Cmm.Ppr() -- For Outputable instances
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.Dataflow.Collections
 
 import Unique           ( pprUniqueAlways )
 import Outputable
diff --git a/compiler/nativeGen/SPARC/ShortcutJump.hs b/compiler/nativeGen/SPARC/ShortcutJump.hs
index e2a8a71572..02d51de30f 100644
--- a/compiler/nativeGen/SPARC/ShortcutJump.hs
+++ b/compiler/nativeGen/SPARC/ShortcutJump.hs
@@ -13,9 +13,9 @@ import GhcPrelude
 import SPARC.Instr
 import SPARC.Imm
 
-import CLabel
-import BlockId
-import Cmm
+import GHC.Cmm.CLabel
+import GHC.Cmm.BlockId
+import GHC.Cmm
 
 import Panic
 import Outputable
diff --git a/compiler/nativeGen/X86/CodeGen.hs b/compiler/nativeGen/X86/CodeGen.hs
index 8cea28d920..14e7cb56ce 100644
--- a/compiler/nativeGen/X86/CodeGen.hs
+++ b/compiler/nativeGen/X86/CodeGen.hs
@@ -44,7 +44,7 @@ import X86.RegInfo
 
 import GHC.Platform.Regs
 import CPrim
-import Debug            ( DebugBlock(..), UnwindPoint(..), UnwindTable
+import GHC.Cmm.DebugBlock            ( DebugBlock(..), UnwindPoint(..), UnwindTable
                         , UnwindExpr(UwReg), toUnwindExpr )
 import Instruction
 import PIC
@@ -59,16 +59,16 @@ import GHC.Platform
 
 -- Our intermediate code:
 import BasicTypes
-import BlockId
+import GHC.Cmm.BlockId
 import Module           ( primUnitId )
-import CmmUtils
-import CmmSwitch
-import Cmm
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import Hoopl.Label
-import CLabel
+import GHC.Cmm.Utils
+import GHC.Cmm.Switch
+import GHC.Cmm
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
+import GHC.Cmm.CLabel
 import CoreSyn          ( Tickish(..) )
 import SrcLoc           ( srcSpanFile, srcSpanStartLine, srcSpanStartCol )
 
@@ -360,7 +360,7 @@ stmtToInstrs bid stmt = do
       CmmBranch id          -> return $ genBranch id
 
       --We try to arrange blocks such that the likely branch is the fallthrough
-      --in CmmContFlowOpt. So we can assume the condition is likely false here.
+      --in GHC.Cmm.ContFlowOpt. So we can assume the condition is likely false here.
       CmmCondBranch arg true false _ -> genCondBranch bid true false arg
       CmmSwitch arg ids -> do dflags <- getDynFlags
                               genSwitch dflags arg ids
diff --git a/compiler/nativeGen/X86/Instr.hs b/compiler/nativeGen/X86/Instr.hs
index 80a2c8b28e..4591464671 100644
--- a/compiler/nativeGen/X86/Instr.hs
+++ b/compiler/nativeGen/X86/Instr.hs
@@ -26,22 +26,22 @@ import RegClass
 import Reg
 import TargetReg
 
-import BlockId
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.BlockId
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 import GHC.Platform.Regs
-import Cmm
+import GHC.Cmm
 import FastString
 import Outputable
 import GHC.Platform
 
 import BasicTypes       (Alignment)
-import CLabel
+import GHC.Cmm.CLabel
 import DynFlags
 import UniqSet
 import Unique
 import UniqSupply
-import Debug (UnwindTable)
+import GHC.Cmm.DebugBlock (UnwindTable)
 
 import Control.Monad
 import Data.Maybe       (fromMaybe)
diff --git a/compiler/nativeGen/X86/Ppr.hs b/compiler/nativeGen/X86/Ppr.hs
index 76a806982e..d857a952ce 100644
--- a/compiler/nativeGen/X86/Ppr.hs
+++ b/compiler/nativeGen/X86/Ppr.hs
@@ -33,13 +33,13 @@ import Reg
 import PprBase
 
 
-import Hoopl.Collections
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Label
 import BasicTypes       (Alignment, mkAlignment, alignmentBytes)
 import DynFlags
-import Cmm              hiding (topInfoTable)
-import BlockId
-import CLabel
+import GHC.Cmm              hiding (topInfoTable)
+import GHC.Cmm.BlockId
+import GHC.Cmm.CLabel
 import Unique           ( pprUniqueAlways )
 import GHC.Platform
 import FastString
diff --git a/compiler/nativeGen/X86/Regs.hs b/compiler/nativeGen/X86/Regs.hs
index 24cdff89af..44f92017a1 100644
--- a/compiler/nativeGen/X86/Regs.hs
+++ b/compiler/nativeGen/X86/Regs.hs
@@ -55,8 +55,8 @@ import GHC.Platform.Regs
 import Reg
 import RegClass
 
-import Cmm
-import CLabel           ( CLabel )
+import GHC.Cmm
+import GHC.Cmm.CLabel           ( CLabel )
 import DynFlags
 import Outputable
 import GHC.Platform
diff --git a/compiler/prelude/PrimOp.hs b/compiler/prelude/PrimOp.hs
index c51304b85d..81d643fc66 100644
--- a/compiler/prelude/PrimOp.hs
+++ b/compiler/prelude/PrimOp.hs
@@ -30,7 +30,7 @@ import GhcPrelude
 import TysPrim
 import TysWiredIn
 
-import CmmType
+import GHC.Cmm.Type
 import Demand
 import Id               ( Id, mkVanillaGlobalWithInfo )
 import IdInfo           ( vanillaIdInfo, setCafInfo, CafInfo(NoCafRefs) )
diff --git a/compiler/profiling/ProfInit.hs b/compiler/profiling/ProfInit.hs
index 931299a655..f8dc8822ba 100644
--- a/compiler/profiling/ProfInit.hs
+++ b/compiler/profiling/ProfInit.hs
@@ -10,7 +10,7 @@ module ProfInit (profilingInitCode) where
 
 import GhcPrelude
 
-import CLabel
+import GHC.Cmm.CLabel
 import CostCentre
 import DynFlags
 import Outputable
diff --git a/ghc.mk b/ghc.mk
index 83a2853ddb..a7ebdfbdaa 100644
--- a/ghc.mk
+++ b/ghc.mk
@@ -1217,8 +1217,8 @@ sdist-ghc-prep-tree :
 
 # Add files generated by alex and happy.
 # These rules depend on sdist-ghc-prep-tree.
-$(eval $(call sdist-ghc-file,compiler,stage2,cmm,CmmLex,x))
-$(eval $(call sdist-ghc-file,compiler,stage2,cmm,CmmParse,y))
+$(eval $(call sdist-ghc-file,compiler,stage2,GHC,Cmm,Lexer,x))
+$(eval $(call sdist-ghc-file,compiler,stage2,GHC,Cmm,Parser,y))
 $(eval $(call sdist-ghc-file,compiler,stage2,parser,Lexer,x))
 $(eval $(call sdist-ghc-file,compiler,stage2,parser,Parser,y))
 $(eval $(call sdist-ghc-file,utils/hpc,dist-install,,HpcParser,y))
diff --git a/hadrian/src/Rules.hs b/hadrian/src/Rules.hs
index 3f6397fdcc..08f8b571f6 100644
--- a/hadrian/src/Rules.hs
+++ b/hadrian/src/Rules.hs
@@ -54,8 +54,8 @@ toolArgsTarget = do
     need [ root -/- dir -/- "Config.hs" ]
     need [ root -/- dir -/- "Parser.hs" ]
     need [ root -/- dir -/- "Lexer.hs" ]
-    need [ root -/- dir -/- "CmmParse.hs" ]
-    need [ root -/- dir -/- "CmmLex.hs" ]
+    need [ root -/- dir -/- "GHC" -/- "Cmm" -/- "Parser.hs" ]
+    need [ root -/- dir -/- "GHC" -/- "Cmm" -/- "Lexer.hs"  ]
 
     -- Find out the arguments that are needed to load a module into the
     -- session
diff --git a/hadrian/src/Rules/SourceDist.hs b/hadrian/src/Rules/SourceDist.hs
index 8eb215d9ea..b6b41f1677 100644
--- a/hadrian/src/Rules/SourceDist.hs
+++ b/hadrian/src/Rules/SourceDist.hs
@@ -146,8 +146,8 @@ prepareTree dest = do
     -- files, which implements exactly the logic that we
     -- have for 'alexHappyFiles' above.
     alexHappyFiles =
-        [ (Stage0, compiler, "CmmParse.y", Just "cmm", "CmmParse.hs")
-        , (Stage0, compiler, "CmmLex.x", Just "cmm", "CmmLex.hs")
+        [ (Stage0, compiler, "Parser.y", Just ("GHC" -/- "Cmm"), "Parser.hs")
+        , (Stage0, compiler, "Lexer.x", Just ("GHC" -/- "Cmm"), "Lexer.hs")
         , (Stage0, compiler, "Parser.y", Just "parser", "Parser.hs")
         , (Stage0, compiler, "Lexer.x", Just "parser", "Lexer.hs")
         , (Stage0, hpcBin, "HpcParser.y", Nothing, "HpcParser.hs")
diff --git a/includes/Cmm.h b/includes/Cmm.h
index 546e81e8f6..4e2d1b1a22 100644
--- a/includes/Cmm.h
+++ b/includes/Cmm.h
@@ -7,7 +7,7 @@
  * making .cmm code a bit less error-prone to write, and a bit easier
  * on the eye for the reader.
  *
- * For the syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * For the syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * Accessing fields of structures defined in the RTS header files is
  * done via automatically-generated macros in DerivedConstants.h.  For
@@ -469,7 +469,7 @@
 // Version of GC_PRIM for use in low-level Cmm.  We can call
 // stg_gc_prim, because it takes one argument and therefore has a
 // platform-independent calling convention (Note [Syntax of .cmm
-// files] in CmmParse.y).
+// files] in GHC.Cmm.Parser).
 #define GC_PRIM_LL(fun)                         \
         R1 = fun;                               \
         jump stg_gc_prim [R1];
diff --git a/includes/CodeGen.Platform.hs b/includes/CodeGen.Platform.hs
index b108a61c0a..228e16e55c 100644
--- a/includes/CodeGen.Platform.hs
+++ b/includes/CodeGen.Platform.hs
@@ -1,5 +1,5 @@
 
-import CmmExpr
+import GHC.Cmm.Expr
 #if !(defined(MACHREGS_i386) || defined(MACHREGS_x86_64) \
     || defined(MACHREGS_sparc) || defined(MACHREGS_powerpc))
 import PlainPanic
diff --git a/rts/Apply.cmm b/rts/Apply.cmm
index dcfaa446f2..f23a507402 100644
--- a/rts/Apply.cmm
+++ b/rts/Apply.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * -------------------------------------------------------------------------- */
 
diff --git a/rts/Exception.cmm b/rts/Exception.cmm
index 334d0ef823..726489e191 100644
--- a/rts/Exception.cmm
+++ b/rts/Exception.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * ---------------------------------------------------------------------------*/
 
diff --git a/rts/HeapStackCheck.cmm b/rts/HeapStackCheck.cmm
index 85fb1cbef6..461cf13df1 100644
--- a/rts/HeapStackCheck.cmm
+++ b/rts/HeapStackCheck.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * ---------------------------------------------------------------------------*/
 
diff --git a/rts/PrimOps.cmm b/rts/PrimOps.cmm
index 0486399b46..7f0b7d5d90 100644
--- a/rts/PrimOps.cmm
+++ b/rts/PrimOps.cmm
@@ -17,7 +17,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * ---------------------------------------------------------------------------*/
 
diff --git a/rts/StgMiscClosures.cmm b/rts/StgMiscClosures.cmm
index 03ea91fcb6..42c7d98d58 100644
--- a/rts/StgMiscClosures.cmm
+++ b/rts/StgMiscClosures.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * --------------------------------------------------------------------------*/
 
diff --git a/rts/StgStartup.cmm b/rts/StgStartup.cmm
index 571e0637fc..122eace1f3 100644
--- a/rts/StgStartup.cmm
+++ b/rts/StgStartup.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * ---------------------------------------------------------------------------*/
 
diff --git a/rts/StgStdThunks.cmm b/rts/StgStdThunks.cmm
index 204cd1a04e..5239496be5 100644
--- a/rts/StgStdThunks.cmm
+++ b/rts/StgStdThunks.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * ---------------------------------------------------------------------------*/
 
diff --git a/rts/Updates.cmm b/rts/Updates.cmm
index 9d00fb8efb..d459607752 100644
--- a/rts/Updates.cmm
+++ b/rts/Updates.cmm
@@ -6,7 +6,7 @@
  *
  * This file is written in a subset of C--, extended with various
  * features specific to GHC.  It is compiled by GHC directly.  For the
- * syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
+ * syntax of .cmm files, see the parser in ghc/compiler/GHC/Cmm/Parser.y.
  *
  * ---------------------------------------------------------------------------*/
 
diff --git a/testsuite/tests/cmm/should_run/HooplPostorder.hs b/testsuite/tests/cmm/should_run/HooplPostorder.hs
index 269efa4021..6171c7edf8 100644
--- a/testsuite/tests/cmm/should_run/HooplPostorder.hs
+++ b/testsuite/tests/cmm/should_run/HooplPostorder.hs
@@ -2,10 +2,10 @@
 {-# LANGUAGE KindSignatures #-}
 module Main where
 
-import Hoopl.Block
-import Hoopl.Collections
-import Hoopl.Graph
-import Hoopl.Label
+import GHC.Cmm.Dataflow.Block
+import GHC.Cmm.Dataflow.Collections
+import GHC.Cmm.Dataflow.Graph
+import GHC.Cmm.Dataflow.Label
 
 import Data.Maybe
 
diff --git a/testsuite/tests/codeGen/should_run/T13825-unit.hs b/testsuite/tests/codeGen/should_run/T13825-unit.hs
index 24fc463b91..85777bfe72 100644
--- a/testsuite/tests/codeGen/should_run/T13825-unit.hs
+++ b/testsuite/tests/codeGen/should_run/T13825-unit.hs
@@ -2,7 +2,7 @@ module Main where
 
 import DynFlags
 import GHC.Types.RepType
-import SMRep
+import GHC.Runtime.Layout
 import GHC.StgToCmm.Layout
 import GHC.StgToCmm.Closure
 import GHC
diff --git a/testsuite/tests/regalloc/regalloc_unit_tests.hs b/testsuite/tests/regalloc/regalloc_unit_tests.hs
index 5c6d9da624..cbd0361d15 100644
--- a/testsuite/tests/regalloc/regalloc_unit_tests.hs
+++ b/testsuite/tests/regalloc/regalloc_unit_tests.hs
@@ -26,13 +26,13 @@ import qualified X86.Instr
 import HscMain
 import GHC.StgToCmm.CgUtils
 import AsmCodeGen
-import CmmBuildInfoTables
-import CmmPipeline
-import CmmParse
-import CmmInfo
-import Cmm
+import GHC.Cmm.Info.Build
+import GHC.Cmm.Pipeline
+import GHC.Cmm.Parser
+import GHC.Cmm.Info
+import GHC.Cmm
 import Module
-import Debug
+import GHC.Cmm.DebugBlock
 import GHC
 import GhcMonad
 import UniqFM