[project @ 2002-02-06 11:13:47 by sewardj]

[ghc-hetmet.git] / ghc / compiler / absCSyn / AbsCSyn.lhs

diff --git a/ghc/compiler/absCSyn/AbsCSyn.lhs b/ghc/compiler/absCSyn/AbsCSyn.lhs
index 977027d..edc2bc0 100644 (file)
--- a/ghc/compiler/absCSyn/AbsCSyn.lhs
+++ b/ghc/compiler/absCSyn/AbsCSyn.lhs
@@ -1,7 +1,7 @@
 %
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
-% $Id: AbsCSyn.lhs,v 1.40 2001/11/23 11:58:00 simonmar Exp $
+% $Id: AbsCSyn.lhs,v 1.45 2002/02/06 11:13:47 sewardj Exp $
 %
 \section[AbstractC]{Abstract C: the last stop before machine code}
 
@@ -47,12 +47,14 @@ import CostCentre       ( CostCentre, CostCentreStack )
 import Literal         ( mkMachInt, Literal(..) )
 import ForeignCall     ( CCallSpec )
 import PrimRep         ( PrimRep(..) )
+import MachOp          ( MachOp(..) )
 import Unique           ( Unique )
 import StgSyn          ( StgOp )
 import TyCon           ( TyCon )
 import BitSet                          -- for liveness masks
 import FastTypes
 
+import Outputable
 \end{code}
 
 @AbstractC@ is a list of Abstract~C statements, but the data structure
@@ -113,10 +115,29 @@ stored in a mixed type location.)
   | CInitHdr           -- to initialise the header of a closure (both fixed/var parts)
        ClosureInfo
        CAddrMode       -- address of the info ptr
-       CAddrMode       -- cost centre to place in closure
+       !CAddrMode      -- cost centre to place in closure
                        --   CReg CurCostCentre or CC_HDR(R1.p{-Node-})
        Int             -- size of closure, for profiling
 
+  -- NEW CASES FOR EXPANDED PRIMOPS
+
+  | CMachOpStmt                        -- Machine-level operation
+       CAddrMode               -- result
+       MachOp
+       [CAddrMode]             -- Arguments
+        (Maybe [MagicId])      -- list of regs which need to be preserved
+       -- across the primop.  This is allowed to be Nothing only if
+       -- machOpIsDefinitelyInline returns True.  And that in turn may
+       -- only return True if we are absolutely sure that the mach op
+       -- can be done inline on all platforms.  
+
+  | CSequential                -- Do the nested AbstractCs sequentially.
+       [AbstractC]     -- In particular, as far as the AbsCUtils.doSimultaneously
+                       -- is concerned, these stmts are to be treated as atomic
+                       -- and are not to be reordered.
+
+  -- end of NEW CASES FOR EXPANDED PRIMOPS
+
   | COpStmt
        [CAddrMode]     -- Results
        StgOp
@@ -171,8 +192,7 @@ stored in a mixed type location.)
   -- *** the next three [or so...] are DATA (those above are CODE) ***
 
   | CStaticClosure
-       CLabel  -- The (full, not base) label to use for labelling the closure.
-       ClosureInfo
+       ClosureInfo             -- Todo: maybe info_lbl & closure_lbl instead?
        CAddrMode               -- cost centre identifier to place in closure
        [CAddrMode]             -- free vars; ptrs, then non-ptrs.
 
@@ -318,6 +338,10 @@ data CAddrMode
                        --      which gives the magic location itself
                        --      (NB: superceded by CReg)
 
+             -- JRS 2002-02-05: CAddr is really scummy and should be fixed.
+             -- The effect is that the semantics of CAddr depend on what the
+             -- contained RegRelative is; it is decidely non-orthogonal.
+
   | CReg MagicId       -- To replace (CAddr MagicId 0)
 
   | CTemp !Unique !PrimRep     -- Temporary locations
@@ -349,6 +373,10 @@ data CAddrMode
        !PrimRep        -- the kind of the result
        CExprMacro      -- the macro to generate a value
        [CAddrMode]     -- and its arguments
+
+  | CBytesPerWord      -- Word size, in bytes, on this platform
+                       -- required for: half-word loads (used in fishing tags
+                       -- out of info tables), and sizeofByteArray#.
 \end{code}
 
 Various C macros for values which are dependent on the back-end layout.