Major cleanup of the CPS code (but more is still to come)

[ghc-hetmet.git] / compiler / cmm / Cmm.hs

diff --git a/compiler/cmm/Cmm.hs b/compiler/cmm/Cmm.hs
index 06e3d16..0d1876e 100644 (file)
--- a/compiler/cmm/Cmm.hs
+++ b/compiler/cmm/Cmm.hs
@@ -10,17 +10,17 @@ module Cmm (
        GenCmm(..), Cmm,
        GenCmmTop(..), CmmTop,
        GenBasicBlock(..), CmmBasicBlock, blockId, blockStmts,
-       CmmStmt(..),  
+       CmmStmt(..), CmmActuals, CmmFormals,
        CmmCallTarget(..),
        CmmStatic(..), Section(..),
        CmmExpr(..), cmmExprRep, 
        CmmReg(..), cmmRegRep,
        CmmLit(..), cmmLitRep,
        LocalReg(..), localRegRep,
-       BlockId(..),
+       BlockId(..), BlockEnv,
        GlobalReg(..), globalRegRep,
 
-       node, nodeReg, spReg, hpReg,
+       node, nodeReg, spReg, hpReg, spLimReg
   ) where
 
 #include "HsVersions.h"
@@ -29,6 +29,7 @@ import MachOp
 import CLabel
 import ForeignCall
 import Unique
+import UniqFM
 import FastString
 
 import Data.Word
@@ -113,8 +114,8 @@ data CmmStmt
 
   | CmmCall                     -- A foreign call, with 
      CmmCallTarget
-     [(CmmReg,MachHint)]        -- zero or more results
-     [(CmmExpr,MachHint)]       -- zero or more arguments
+     CmmFormals                         -- zero or more results
+     CmmActuals                         -- zero or more arguments
      (Maybe [GlobalReg])        -- Global regs that may need to be saved
                                 -- if they will be clobbered by the call.
                                 -- Nothing <=> save *all* globals that
@@ -130,8 +131,14 @@ data CmmStmt
        --      one  -> second block etc
        -- Undefined outside range, and when there's a Nothing
 
-  | CmmJump CmmExpr [LocalReg]    -- Jump to another function, with these 
-                                 -- parameters.
+  | CmmJump CmmExpr               -- Jump to another function,
+    CmmActuals                    -- with these parameters.
+
+  | CmmReturn                     -- Return from a function,
+    CmmActuals                    -- with these return values.
+
+type CmmActuals = [(CmmExpr,MachHint)]
+type CmmFormals = [(CmmReg,MachHint)]
 
 {-
 Discussion
@@ -200,6 +207,7 @@ data CmmExpr
        --        ** is shorthand only, meaning **
        -- CmmMachOp (MO_S_Add rep (CmmReg reg) (CmmLit (CmmInt i rep)))
        --      where rep = cmmRegRep reg
+  deriving Eq
 
 cmmExprRep :: CmmExpr -> MachRep
 cmmExprRep (CmmLit lit)      = cmmLitRep lit
@@ -248,6 +256,7 @@ data CmmLit
         -- It is also used inside the NCG during when generating
         -- position-independent code. 
   | CmmLabelDiffOff CLabel CLabel Int   -- label1 - label2 + offset
+  deriving Eq
 
 cmmLitRep :: CmmLit -> MachRep
 cmmLitRep (CmmInt _ rep)    = rep
@@ -267,6 +276,8 @@ newtype BlockId = BlockId Unique
 instance Uniquable BlockId where
   getUnique (BlockId u) = u
 
+type BlockEnv a = UniqFM {- BlockId -} a
+
 -----------------------------------------------------------------------------
 --             Static Data
 -----------------------------------------------------------------------------
@@ -343,9 +354,10 @@ data GlobalReg
         )
 
 -- convenient aliases
-spReg, hpReg, nodeReg :: CmmReg
+spReg, hpReg, spLimReg, nodeReg :: CmmReg
 spReg = CmmGlobal Sp
 hpReg = CmmGlobal Hp
+spLimReg = CmmGlobal SpLim
 nodeReg = CmmGlobal node
 
 node :: GlobalReg