%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1994
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
%
\section[CgHeapery]{Heap management functions}
module CgHeapery (
heapCheck,
- allocHeap, allocDynClosure,
+ allocHeap, allocDynClosure
-#ifdef GRAN
- -- new for GrAnSim HWL
- heapCheckOnly, fetchAndReschedule,
-#endif {- GRAN -}
-
- -- and to make the interface self-sufficient...
- AbstractC, CAddrMode, HeapOffset,
- CgState, ClosureInfo, Id
+ -- new functions, basically inserting macro calls into Code -- HWL
+ , heapCheckOnly, fetchAndReschedule, yield
) where
+IMP_Ubiq(){-uitous-}
+
import AbsCSyn
import CgMonad
-import CgRetConv ( mkLiveRegsBitMask )
+import AbsCUtils ( mkAbstractCs, getAmodeRep )
import CgUsages ( getVirtAndRealHp, setVirtHp, setRealHp,
initHeapUsage
)
-import ClosureInfo ( closureSize, closureHdrSize, closureGoodStuffSize, slopSize,
- layOutDynClosure,
- allocProfilingMsg, closureKind
+import ClosureInfo ( closureSize, closureHdrSize, closureGoodStuffSize,
+ slopSize, allocProfilingMsg, closureKind, ClosureInfo
+ )
+import HeapOffs ( isZeroOff, addOff, intOff,
+ SYN_IE(VirtualHeapOffset), HeapOffset
)
-import Util
+import PrimRep ( PrimRep(..) )
\end{code}
%************************************************************************
%* *
%************************************************************************
-This is std code we replaced by the bits below for GrAnSim. -- HWL
+The new code for heapChecks. For GrAnSim the code for doing a heap check
+and doing a context switch has been separated. Especially, the HEAP_CHK
+macro only performs a heap check. THREAD_CONTEXT_SWITCH should be used for
+doing a context switch. GRAN_FETCH_AND_RESCHEDULE must be put at the
+beginning of every slow entry code in order to simulate the fetching of
+closures. If fetching is necessary (i.e. current closure is not local) then
+an automatic context switch is done.
\begin{code}
-#ifndef GRAN
-
-heapCheck :: [MagicId] -- Live registers
- -> Bool -- Node reqd after GC?
- -> Code
- -> Code
-
-heapCheck regs node_reqd code
- = initHeapUsage (\ hHw -> do_heap_chk hHw `thenC` code)
- where
-
- do_heap_chk :: HeapOffset -> Code
- do_heap_chk words_required
- = absC (if isZeroOff(words_required) then AbsCNop else checking_code) `thenC`
- -- The test is *inside* the absC, to avoid black holes!
-
- -- Now we have set up the real heap pointer and checked there is
- -- enough space. It remains only to reflect this in the environment
-
- setRealHp words_required
-
- -- The "word_required" here is a fudge.
- -- *** IT DEPENDS ON THE DIRECTION ***, and on
- -- whether the Hp is moved the whole way all
- -- at once or not.
- where
- all_regs = if node_reqd then node:regs else regs
- liveness_mask = mkLiveRegsBitMask all_regs
-
- checking_code = CMacroStmt HEAP_CHK [
- mkIntCLit liveness_mask,
- COffset words_required,
- mkIntCLit (if node_reqd then 1 else 0)]
-#endif {- GRAN -}
-\end{code}
-
-The GrAnSim code for heapChecks. The code for doing a heap check and
-doing a context switch has been separated. Especially, the HEAP_CHK
-macro only performs a heap check. THREAD_CONTEXT_SWITCH should be used
-for doing a context switch. GRAN_FETCH_AND_RESCHEDULE must be put at
-the beginning of every slow entry code in order to simulate the
-fetching of closures. If fetching is necessary (i.e. current closure
-is not local) then an automatic context switch is done.
-
-\begin{code}
-#ifdef GRAN
-
heapCheck :: [MagicId] -- Live registers
-> Bool -- Node reqd after GC?
-> Code
-- at once or not.
where
all_regs = if node_reqd then node:regs else regs
- liveness_mask = mkLiveRegsBitMask all_regs
+ liveness_mask = mkLiveRegsMask all_regs
maybe_context_switch = if do_context_switch
then context_switch_code
-- Emit macro for simulating a fetch and then reschedule
fetchAndReschedule :: [MagicId] -- Live registers
- -> Bool -- Node reqd
+ -> Bool -- Node reqd?
-> Code
-fetchAndReschedule regs node_reqd =
+fetchAndReschedule regs node_reqd =
if (node `elem` regs || node_reqd)
then fetch_code `thenC` reschedule_code
else absC AbsCNop
where
all_regs = if node_reqd then node:regs else regs
- liveness_mask = mkLiveRegsBitMask all_regs
+ liveness_mask = mkLiveRegsMask all_regs
reschedule_code = absC (CMacroStmt GRAN_RESCHEDULE [
mkIntCLit liveness_mask,
--HWL: generate GRAN_FETCH macro for GrAnSim
-- currently GRAN_FETCH and GRAN_FETCH_AND_RESCHEDULE are miai
fetch_code = absC (CMacroStmt GRAN_FETCH [])
+\end{code}
+
+The @GRAN_YIELD@ macro is taken from JSM's code for Concurrent Haskell. It
+allows to context-switch at places where @node@ is not alive (it uses the
+@Continue@ rather than the @EnterNodeCode@ function in the RTS). We emit
+this kind of macro at the beginning of the following kinds of basic bocks:
+\begin{itemize}
+ \item Slow entry code where node is not alive (see @CgClosure.lhs@). Normally
+ we use @fetchAndReschedule@ at a slow entry code.
+ \item Fast entry code (see @CgClosure.lhs@).
+ \item Alternatives in case expressions (@CLabelledCode@ structures), provided
+ that they are not inlined (see @CgCases.lhs@). These alternatives will
+ be turned into separate functions.
+\end{itemize}
+
+\begin{code}
+yield :: [MagicId] -- Live registers
+ -> Bool -- Node reqd?
+ -> Code
+
+yield regs node_reqd =
+ -- NB: node is not alive; that's why we use DO_YIELD rather than
+ -- GRAN_RESCHEDULE
+ yield_code
+ where
+ all_regs = if node_reqd then node:regs else regs
+ liveness_mask = mkLiveRegsMask all_regs
-#endif {- GRAN -}
+ yield_code = absC (CMacroStmt GRAN_YIELD [mkIntCLit liveness_mask])
\end{code}
%************************************************************************
projects / ghc-hetmet.git / blobdiff