@CgClosure@, which deals with closures.
\begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
module CgCon (
cgTopRhsCon, buildDynCon,
bindConArgs, bindUnboxedTupleComponents,
import Type
import PrelInfo
import Outputable
-import Util
import ListSetOps
+import Util
+import FastString
\end{code}
-> FCode (Id, CgIdInfo)
cgTopRhsCon id con args
= do {
- ; this_pkg <- getThisPackage
#if mingw32_TARGET_OS
-- Windows DLLs have a problem with static cross-DLL refs.
+ ; this_pkg <- getThisPackage
; ASSERT( not (isDllConApp this_pkg con args) ) return ()
#endif
; ASSERT( args `lengthIs` dataConRepArity con ) return ()
; let
name = idName id
lf_info = mkConLFInfo con
- closure_label = mkClosureLabel this_pkg name
+ closure_label = mkClosureLabel name
caffy = any stgArgHasCafRefs args
- (closure_info, amodes_w_offsets) = layOutStaticConstr this_pkg con amodes
+ (closure_info, amodes_w_offsets) = layOutStaticConstr con amodes
closure_rep = mkStaticClosureFields
closure_info
dontCareCCS -- Because it's static data
; emitDataLits closure_label closure_rep
-- RETURN
- ; returnFC (id, stableIdInfo id (mkLblExpr closure_label) lf_info) }
+ ; returnFC (id, taggedStableIdInfo id (mkLblExpr closure_label) lf_info con) }
\end{code}
%************************************************************************
\begin{code}
buildDynCon binder cc con []
- = do this_pkg <- getThisPackage
- returnFC (stableIdInfo binder
- (mkLblExpr (mkClosureLabel this_pkg (dataConName con)))
- (mkConLFInfo con))
+ = returnFC (taggedStableIdInfo binder
+ (mkLblExpr (mkClosureLabel (dataConName con)))
+ (mkConLFInfo con)
+ con)
\end{code}
The following three paragraphs about @Char@-like and @Int@-like
, (_, CmmLit (CmmInt val _)) <- arg_amode
, let val_int = (fromIntegral val) :: Int
, val_int <= mAX_INTLIKE && val_int >= mIN_INTLIKE
- = do { let intlike_lbl = mkRtsDataLabel SLIT("stg_INTLIKE_closure")
+ = do { let intlike_lbl = mkRtsDataLabel (sLit "stg_INTLIKE_closure")
offsetW = (val_int - mIN_INTLIKE) * (fixedHdrSize + 1)
-- INTLIKE closures consist of a header and one word payload
intlike_amode = CmmLit (cmmLabelOffW intlike_lbl offsetW)
- ; returnFC (stableIdInfo binder intlike_amode (mkConLFInfo con)) }
+ ; returnFC (taggedStableIdInfo binder intlike_amode (mkConLFInfo con) con) }
buildDynCon binder cc con [arg_amode]
| maybeCharLikeCon con
, (_, CmmLit (CmmInt val _)) <- arg_amode
, let val_int = (fromIntegral val) :: Int
, val_int <= mAX_CHARLIKE && val_int >= mIN_CHARLIKE
- = do { let charlike_lbl = mkRtsDataLabel SLIT("stg_CHARLIKE_closure")
+ = do { let charlike_lbl = mkRtsDataLabel (sLit "stg_CHARLIKE_closure")
offsetW = (val_int - mIN_CHARLIKE) * (fixedHdrSize + 1)
-- CHARLIKE closures consist of a header and one word payload
charlike_amode = CmmLit (cmmLabelOffW charlike_lbl offsetW)
- ; returnFC (stableIdInfo binder charlike_amode (mkConLFInfo con)) }
+ ; returnFC (taggedStableIdInfo binder charlike_amode (mkConLFInfo con) con) }
\end{code}
Now the general case.
\begin{code}
buildDynCon binder ccs con args
= do {
- ; this_pkg <- getThisPackage
; let
- (closure_info, amodes_w_offsets) = layOutDynConstr this_pkg con args
+ (closure_info, amodes_w_offsets) = layOutDynConstr con args
; hp_off <- allocDynClosure closure_info use_cc blame_cc amodes_w_offsets
- ; returnFC (heapIdInfo binder hp_off lf_info) }
+ ; returnFC (taggedHeapIdInfo binder hp_off lf_info con) }
where
lf_info = mkConLFInfo con
\begin{code}
bindConArgs :: DataCon -> [Id] -> Code
bindConArgs con args
- = do this_pkg <- getThisPackage
+ = do
let
- bind_arg (arg, offset) = bindNewToNode arg offset (mkLFArgument arg)
- (_, args_w_offsets) = layOutDynConstr this_pkg con (addIdReps args)
+ -- The binding below forces the masking out of the tag bits
+ -- when accessing the constructor field.
+ bind_arg (arg, offset) = bindNewToUntagNode arg offset (mkLFArgument arg) (tagForCon con)
+ (_, args_w_offsets) = layOutDynConstr con (addIdReps args)
--
ASSERT(not (isUnboxedTupleCon con)) return ()
mapCs bind_arg args_w_offsets
-- Put the table after the data constructor decls, because the
-- datatype closure table (for enumeration types)
-- to (say) PrelBase_$wTrue_closure, which is defined in code_stuff
+ -- Note that the closure pointers are tagged.
+
+ -- XXX comment says to put table after constructor decls, but
+ -- code appears to put it before --- NR 16 Aug 2007
; extra <-
if isEnumerationTyCon tycon then do
tbl <- getCmm (emitRODataLits (mkLocalClosureTableLabel
(tyConName tycon))
- [ CmmLabel (mkLocalClosureLabel (dataConName con))
+ [ CmmLabelOff (mkLocalClosureLabel (dataConName con)) (tagForCon con)
| con <- tyConDataCons tycon])
return [tbl]
else
cgDataCon :: DataCon -> Code
cgDataCon data_con
= do { -- Don't need any dynamic closure code for zero-arity constructors
- this_pkg <- getThisPackage
; let
-- To allow the debuggers, interpreters, etc to cope with
-- time), we take care that info-table contains the
-- information we need.
(static_cl_info, _) =
- layOutStaticConstr this_pkg data_con arg_reps
+ layOutStaticConstr data_con arg_reps
(dyn_cl_info, arg_things) =
- layOutDynConstr this_pkg data_con arg_reps
+ layOutDynConstr data_con arg_reps
emit_info cl_info ticky_code
= do { code_blks <- getCgStmts the_code
body_code = do {
-- NB: We don't set CC when entering data (WDP 94/06)
tickyReturnOldCon (length arg_things)
+ -- The case continuation code is expecting a tagged pointer
+ ; stmtC (CmmAssign nodeReg
+ (tagCons data_con (CmmReg nodeReg)))
; performReturn emitReturnInstr }
-- noStmts: Ptr to thing already in Node