[project @ 2005-05-15 02:46:27 by wolfgang]

Clean up things by making PicBaseReg a constructor of GlobalReg instead
of CmmExpr.

4 files changed, 13 insertions, 10 deletions

diff --git a/ghc/compiler/cmm/Cmm.hs b/ghc/compiler/cmm/Cmm.hs
index a8576ec78e..304ddb2b0f 100644
--- a/ghc/compiler/cmm/Cmm.hs
+++ b/ghc/compiler/cmm/Cmm.hs
@@ -162,7 +162,6 @@ data CmmExpr
 	--        ** is shorthand only, meaning **
 	-- CmmMachOp (MO_S_Add rep (CmmReg reg) (CmmLit (CmmInt i rep)))
 	--	where rep = cmmRegRep reg
-  | CmmPicBaseReg               -- Base Register for PIC calculations
 
 cmmExprRep :: CmmExpr -> MachRep
 cmmExprRep (CmmLit lit)      = cmmLitRep lit
@@ -170,7 +169,6 @@ cmmExprRep (CmmLoad _ rep)   = rep
 cmmExprRep (CmmReg reg)      = cmmRegRep reg
 cmmExprRep (CmmMachOp op _)  = resultRepOfMachOp op
 cmmExprRep (CmmRegOff reg _) = cmmRegRep reg
-cmmExprRep CmmPicBaseReg     = wordRep
 
 data CmmReg 
   = CmmLocal  LocalReg
@@ -296,6 +294,11 @@ data GlobalReg
   -- (where necessary) in the native code generator.
   | BaseReg
 
+  -- Base Register for PIC (position-independent code) calculations
+  -- Only used inside the native code generator. It's exact meaning differs
+  -- from platform to platform (see module PositionIndependentCode).
+  | PicBaseReg
+
   deriving( Eq
 #ifdef DEBUG
 	, Show
diff --git a/ghc/compiler/cmm/PprCmm.hs b/ghc/compiler/cmm/PprCmm.hs
index 0f9a3d527b..f38eb30802 100644
--- a/ghc/compiler/cmm/PprCmm.hs
+++ b/ghc/compiler/cmm/PprCmm.hs
@@ -317,7 +317,6 @@ pprExpr9 e =
         CmmReg    reg       -> ppr reg
         CmmRegOff reg off   -> parens (ppr reg <+> char '+' <+> int off)
 	CmmMachOp mop args  -> genMachOp mop args
-        CmmPicBaseReg       -> text "PIC_BASE_REG"
 	e                   -> parens (pprExpr e)
 
 genMachOp :: MachOp -> [CmmExpr] -> SDoc
@@ -433,6 +432,7 @@ pprGlobalReg gr
         GCEnter1       -> ptext SLIT("stg_gc_enter_1")
         GCFun          -> ptext SLIT("stg_gc_fun")
         BaseReg        -> ptext SLIT("BaseReg")
+        PicBaseReg     -> ptext SLIT("PicBaseReg")
 
         _ -> panic $ "PprCmm.pprGlobalReg: unknown global reg"
 
diff --git a/ghc/compiler/nativeGen/MachCodeGen.hs b/ghc/compiler/nativeGen/MachCodeGen.hs
index 20693cee5a..f700fbcb71 100644
--- a/ghc/compiler/nativeGen/MachCodeGen.hs
+++ b/ghc/compiler/nativeGen/MachCodeGen.hs
@@ -513,17 +513,17 @@ getRegisterReg (CmmGlobal mid)
 
 getRegister :: CmmExpr -> NatM Register
 
+getRegister (CmmReg (CmmGlobal PicBaseReg))
+  = do
+      reg <- getPicBaseNat wordRep
+      return (Fixed wordRep reg nilOL)
+
 getRegister (CmmReg reg) 
   = return (Fixed (cmmRegRep reg) (getRegisterReg reg) nilOL)
 
 getRegister tree@(CmmRegOff _ _) 
   = getRegister (mangleIndexTree tree)
 
-getRegister CmmPicBaseReg
-  = do
-      reg <- getPicBaseNat wordRep
-      return (Fixed wordRep reg nilOL)
-
 -- end of machine-"independent" bit; here we go on the rest...
 
 #if alpha_TARGET_ARCH
diff --git a/ghc/compiler/nativeGen/PositionIndependentCode.hs b/ghc/compiler/nativeGen/PositionIndependentCode.hs
index acf37856dc..0a70b2d54c 100644
--- a/ghc/compiler/nativeGen/PositionIndependentCode.hs
+++ b/ghc/compiler/nativeGen/PositionIndependentCode.hs
@@ -18,7 +18,7 @@ module PositionIndependentCode (
         CodeStub, SymbolPtr, GotSymbolPtr, GotSymbolOffset
     - labelDynamic predicate
   + module Cmm
-    - The CmmExpr datatype has a CmmPicBaseReg constructor
+    - The GlobalReg datatype has a PicBaseReg constructor
     - The CmmLit datatype has a CmmLabelDiffOff constructor
   + codeGen & RTS
     - When tablesNextToCode, no absolute addresses are stored in info tables
@@ -125,7 +125,7 @@ cmmMakePicReference :: CLabel -> CmmExpr
 
 cmmMakePicReference lbl
     | opt_PIC && absoluteLabel lbl = CmmMachOp (MO_Add wordRep) [
-            CmmPicBaseReg,
+            CmmReg (CmmGlobal PicBaseReg),
             CmmLit $ picRelative lbl
         ]
     where