+{-# 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 CmmCPSGen (
-- | Converts continuations into full proceedures.
-- The main work of the CPS transform that everything else is setting-up.
ContinuationFormat(..),
) where
-#include "HsVersions.h"
-
+import BlockId
import Cmm
import CLabel
import CmmBrokenBlock -- Data types only
-import MachOp
import CmmUtils
import CmmCallConv
-import CgProf (curCCS, curCCSAddr)
-import CgUtils (cmmOffsetW)
-import CgInfoTbls (entryCode)
+import CgProf
+import CgUtils
+import CgInfoTbls
import SMRep
import ForeignCall
import StaticFlags
import Unique
import Maybe
+import List
+import FastString
import Panic
-import MachRegs (callerSaveVolatileRegs)
- -- HACK: this is part of the NCG so we shouldn't use this, but we need
- -- it for now to eliminate the need for saved regs to be in CmmCall.
- -- The long term solution is to factor callerSaveVolatileRegs
- -- from nativeGen into CPS
-
-- The format for the call to a continuation
-- The fst is the arguments that must be passed to the continuation
-- by the continuation's caller.
-- Right <=> Function or Proc point
CLabel -- Used to generate both info & entry labels
CmmFormals -- Argument locals live on entry (C-- procedure params)
- Bool -- ^ True <=> GC block so ignore stack size
+ Bool -- True <=> GC block so ignore stack size
[BrokenBlock] -- Code, may be empty. The first block is
-- the entry point. The order is otherwise initially
-- unimportant, but at some point the code gen will
-----------------------------------------------------------------------------
continuationToProc :: (WordOff, WordOff, [(CLabel, ContinuationFormat)])
-> CmmReg
- -> [[Unique]]
+ -> [[[Unique]]]
-> Continuation CmmInfo
-> CmmTop
continuationToProc (max_stack, update_frame_size, formats) stack_use uniques
(Continuation info label formals _ blocks) =
- CmmProc info label formals (concat $ zipWith3 continuationToProc' uniques blocks (True : repeat False))
+ CmmProc info label formals (ListGraph blocks')
where
+ blocks' = concat $ zipWith3 continuationToProc' uniques blocks
+ (True : repeat False)
curr_format = maybe unknown_block id $ lookup label formats
unknown_block = panic "unknown BlockId in continuationToProc"
curr_stack = continuation_frame_size curr_format
- arg_stack = argumentsSize localRegRep formals
+ arg_stack = argumentsSize localRegType formals
param_stmts :: [CmmStmt]
param_stmts = function_entry curr_format
adjust_sp_reg (curr_stack - update_frame_size)
CmmInfo _ Nothing _ -> []
--- At present neither the Cmm parser nor the code generator
--- produce code that will allow the target of a CmmCondBranch
--- or a CmmSwitch to become a continuation or a proc-point.
--- If future revisions, might allow these to happen
--- then special care will have to be take to allow for that case.
- continuationToProc' :: [Unique]
+ continuationToProc' :: [[Unique]]
-> BrokenBlock
-> Bool
-> [CmmBasicBlock]
continuationToProc' uniques (BrokenBlock ident entry stmts _ exit) is_entry =
- prefix_blocks ++ [main_block]
+ prefix_blocks ++ [BasicBlock ident fixed_main_stmts] ++ concat new_blocks
where
prefix_blocks =
if is_entry
(param_stmts ++ [CmmBranch ident])]
else []
- prefix_unique : call_uniques = uniques
+ (prefix_unique : call_uniques) : new_block_uniques = uniques
toCLabel = mkReturnPtLabel . getUnique
+ block_for_branch :: Unique -> BlockId -> (BlockId, [CmmBasicBlock])
block_for_branch unique next
+ -- branches to the current function don't have to jump
+ | (mkReturnPtLabel $ getUnique next) == label
+ = (next, [])
+
+ -- branches to any other function have to jump
| (Just cont_format) <- lookup (toCLabel next) formats
= let
new_next = BlockId unique
arguments = map formal_to_actual (continuation_formals cont_format)
in (new_next,
[BasicBlock new_next $
- pack_continuation False curr_format cont_format ++
+ pack_continuation curr_format cont_format ++
tail_call (curr_stack - cont_stack)
- (CmmLit $ CmmLabel $ toCLabel next)
- arguments])
+ (CmmLit $ CmmLabel $ toCLabel next)
+ arguments])
+
+ -- branches to blocks in the current function don't have to jump
| otherwise
= (next, [])
+ -- Wrapper for block_for_branch for when the target
+ -- is inside a 'Maybe'.
block_for_branch' :: Unique -> Maybe BlockId -> (Maybe BlockId, [CmmBasicBlock])
block_for_branch' _ Nothing = (Nothing, [])
block_for_branch' unique (Just next) = (Just new_next, new_blocks)
where (new_next, new_blocks) = block_for_branch unique next
- main_block =
+ -- If the target of a switch, branch or cond branch becomes a proc point
+ -- then we have to make a new block what will then *jump* to the original target.
+ proc_point_fix unique (CmmCondBranch test target)
+ = (CmmCondBranch test new_target, new_blocks)
+ where (new_target, new_blocks) = block_for_branch (head unique) target
+ proc_point_fix unique (CmmSwitch test targets)
+ = (CmmSwitch test new_targets, concat new_blocks)
+ where (new_targets, new_blocks) =
+ unzip $ zipWith block_for_branch' unique targets
+ proc_point_fix unique (CmmBranch target)
+ = (CmmBranch new_target, new_blocks)
+ where (new_target, new_blocks) = block_for_branch (head unique) target
+ proc_point_fix _ other = (other, [])
+
+ (fixed_main_stmts, new_blocks) = unzip $ zipWith proc_point_fix new_block_uniques main_stmts
+ main_stmts =
case entry of
FunctionEntry _ _ _ ->
- -- Ugh, the statements for an update frame must come
- -- *after* the GC check that was added at the beginning
- -- of the CPS pass. So we have do edit the statements
- -- a bit. This depends on the knowledge that the
- -- statements in the first block are only the GC check.
- -- That's fragile but it works for now.
- BasicBlock ident (gc_stmts ++ stmts ++ update_stmts ++ postfix_stmts)
- ControlEntry -> BasicBlock ident (stmts ++ postfix_stmts)
- ContinuationEntry _ _ _ -> BasicBlock ident (stmts ++ postfix_stmts)
+ -- The statements for an update frame must come /after/
+ -- the GC check that was added at the beginning of the
+ -- CPS pass. So we have do edit the statements a bit.
+ -- This depends on the knowledge that the statements in
+ -- the first block are only the GC check. That's
+ -- fragile but it works for now.
+ gc_stmts ++ stmts ++ update_stmts ++ postfix_stmts
+ ControlEntry -> stmts ++ postfix_stmts
+ ContinuationEntry _ _ _ -> stmts ++ postfix_stmts
postfix_stmts = case exit of
- FinalBranch next ->
- if (mkReturnPtLabel $ getUnique next) == label
- then [CmmBranch next]
- else case lookup (mkReturnPtLabel $ getUnique next) formats of
- Nothing -> [CmmBranch next]
- Just cont_format ->
- pack_continuation True curr_format cont_format ++
- tail_call (curr_stack - cont_stack)
- (CmmLit $ CmmLabel $ mkReturnPtLabel $ getUnique next)
- arguments
- where
- cont_stack = continuation_frame_size cont_format
- arguments = map formal_to_actual (continuation_formals cont_format)
+ -- Branches and switches may get modified by proc_point_fix
+ FinalBranch next -> [CmmBranch next]
FinalSwitch expr targets -> [CmmSwitch expr targets]
+
+ -- A return is a tail call to the stack top
FinalReturn arguments ->
tail_call curr_stack
- (entryCode (CmmLoad (CmmReg spReg) wordRep))
+ (entryCode (CmmLoad (CmmReg spReg) bWord))
arguments
+
+ -- A tail call
FinalJump target arguments ->
tail_call curr_stack target arguments
-- A regular Cmm function call
- FinalCall next (CmmForeignCall target CmmCallConv)
- results arguments _ _ ->
- pack_continuation True curr_format cont_format ++
+ FinalCall next (CmmCallee target CmmCallConv)
+ results arguments _ _ _ ->
+ pack_continuation curr_format cont_format ++
tail_call (curr_stack - cont_stack)
target arguments
where
cont_stack = continuation_frame_size cont_format
-- A safe foreign call
- FinalCall next (CmmForeignCall target conv)
- results arguments _ _ ->
+ FinalCall next (CmmCallee target conv)
+ results arguments _ _ _ ->
target_stmts ++
- foreignCall call_uniques' (CmmForeignCall new_target conv)
+ foreignCall call_uniques' (CmmCallee new_target conv)
results arguments
where
(call_uniques', target_stmts, new_target) =
-- A safe prim call
FinalCall next (CmmPrim target)
- results arguments _ _ ->
+ results arguments _ _ _ ->
foreignCall call_uniques (CmmPrim target)
results arguments
-formal_to_actual reg = (CmmReg (CmmLocal reg), NoHint)
+formal_to_actual reg = CmmHinted (CmmReg (CmmLocal reg)) NoHint
-foreignCall :: [Unique] -> CmmCallTarget -> CmmHintFormals -> CmmActuals -> [CmmStmt]
+foreignCall :: [Unique] -> CmmCallTarget -> HintedCmmFormals -> HintedCmmActuals -> [CmmStmt]
foreignCall uniques call results arguments =
arg_stmts ++
saveThreadState ++
caller_save ++
- [CmmCall (CmmForeignCall suspendThread CCallConv)
- [ (id,PtrHint) ]
- [ (CmmReg (CmmGlobal BaseReg), PtrHint) ]
- CmmUnsafe,
- CmmCall call results new_args CmmUnsafe,
- CmmCall (CmmForeignCall resumeThread CCallConv)
- [ (new_base, PtrHint) ]
- [ (CmmReg (CmmLocal id), PtrHint) ]
- CmmUnsafe,
+ [CmmCall (CmmCallee suspendThread CCallConv)
+ [ CmmHinted id AddrHint ]
+ [ CmmHinted (CmmReg (CmmGlobal BaseReg)) AddrHint ]
+ CmmUnsafe
+ CmmMayReturn,
+ CmmCall call results new_args CmmUnsafe CmmMayReturn,
+ CmmCall (CmmCallee resumeThread CCallConv)
+ [ CmmHinted new_base AddrHint ]
+ [ CmmHinted (CmmReg (CmmLocal id)) AddrHint ]
+ CmmUnsafe
+ CmmMayReturn,
-- Assign the result to BaseReg: we
-- might now have a different Capability!
CmmAssign (CmmGlobal BaseReg) (CmmReg (CmmLocal new_base))] ++
caller_load ++
loadThreadState tso_unique ++
- [CmmJump (CmmReg spReg) (map (formal_to_actual . fst) results)]
+ [CmmJump (CmmReg spReg) (map (formal_to_actual . hintlessCmm) results)]
where
(_, arg_stmts, new_args) =
loadArgsIntoTemps argument_uniques arguments
(caller_save, caller_load) =
callerSaveVolatileRegs (Just [{-only system regs-}])
- new_base = LocalReg base_unique (cmmRegRep (CmmGlobal BaseReg)) KindNonPtr
- id = LocalReg id_unique wordRep KindNonPtr
+ new_base = LocalReg base_unique (cmmRegType (CmmGlobal BaseReg))
+ id = LocalReg id_unique bWord
tso_unique : base_unique : id_unique : argument_uniques = uniques
-- -----------------------------------------------------------------------------
-- Save/restore the thread state in the TSO
-suspendThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("suspendThread")))
-resumeThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("resumeThread")))
+suspendThread = CmmLit (CmmLabel (mkRtsCodeLabel (sLit "suspendThread")))
+resumeThread = CmmLit (CmmLabel (mkRtsCodeLabel (sLit "resumeThread")))
-- This stuff can't be done in suspendThread/resumeThread, because it
-- refers to global registers which aren't available in the C world.
CmmAssign (CmmLocal tso) stgCurrentTSO,
-- Sp = tso->sp;
CmmAssign sp (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_SP)
- wordRep),
+ bWord),
-- SpLim = tso->stack + RESERVED_STACK_WORDS;
CmmAssign spLim (cmmOffsetW (cmmOffset (CmmReg (CmmLocal tso)) tso_STACK)
rESERVED_STACK_WORDS)
-- and load the current cost centre stack from the TSO when profiling:
if opt_SccProfilingOn
then [CmmStore curCCSAddr
- (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_CCCS) wordRep)]
+ (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_CCCS) bWord)]
else []
- where tso = LocalReg tso_unique wordRep KindNonPtr -- TODO FIXME NOW
+ where tso = LocalReg tso_unique bWord -- TODO FIXME NOW
openNursery = [
-- Hp = CurrentNursery->free - 1;
- CmmAssign hp (cmmOffsetW (CmmLoad nursery_bdescr_free wordRep) (-1)),
+ CmmAssign hp (cmmOffsetW (CmmLoad nursery_bdescr_free bWord) (-1)),
-- HpLim = CurrentNursery->start +
-- CurrentNursery->blocks*BLOCK_SIZE_W - 1;
CmmAssign hpLim
(cmmOffsetExpr
- (CmmLoad nursery_bdescr_start wordRep)
+ (CmmLoad nursery_bdescr_start bWord)
(cmmOffset
(CmmMachOp mo_wordMul [
- CmmMachOp (MO_S_Conv I32 wordRep)
- [CmmLoad nursery_bdescr_blocks I32],
+ CmmMachOp (MO_SS_Conv W32 wordWidth)
+ [CmmLoad nursery_bdescr_blocks b32],
CmmLit (mkIntCLit bLOCK_SIZE)
])
(-1)
-- for packing/unpacking continuations
-- and entering/exiting functions
-tail_call :: WordOff -> CmmExpr -> CmmActuals -> [CmmStmt]
+tail_call :: WordOff -> CmmExpr -> HintedCmmActuals -> [CmmStmt]
tail_call spRel target arguments
= store_arguments ++ adjust_sp_reg spRel ++ jump where
store_arguments =
[stack_put spRel expr offset
- | ((expr, _), StackParam offset) <- argument_formats] ++
+ | ((CmmHinted expr _), StackParam offset) <- argument_formats] ++
[global_put expr global
- | ((expr, _), RegisterParam global) <- argument_formats]
+ | ((CmmHinted expr _), RegisterParam global) <- argument_formats]
jump = [CmmJump target arguments]
- argument_formats = assignArguments (cmmExprRep . fst) arguments
+ argument_formats = assignArguments (cmmExprType . hintlessCmm) arguments
adjust_sp_reg spRel =
if spRel == 0
= check_stack_limit where
check_stack_limit = [
CmmCondBranch
- (CmmMachOp (MO_U_Lt $ cmmRegRep spReg)
- [CmmRegOff spReg (-max_frame_size*wORD_SIZE),
+ (CmmMachOp (MO_U_Lt (typeWidth (cmmRegType spReg)))
+ [CmmRegOff spReg (-max_frame_size*wORD_SIZE),
CmmReg spLimReg])
gc_block]
-pack_continuation :: Bool -- ^ Whether to set the top/header
- -- of the stack. We only need to
- -- set it if we are calling down
- -- as opposed to continuation
- -- adaptors.
- -> ContinuationFormat -- ^ The current format
+pack_continuation :: ContinuationFormat -- ^ The current format
-> ContinuationFormat -- ^ The return point format
-> [CmmStmt]
-pack_continuation allow_header_set
- (ContinuationFormat _ curr_id curr_frame_size _)
- (ContinuationFormat _ cont_id cont_frame_size live_regs)
+pack_continuation (ContinuationFormat _ curr_id curr_frame_size _)
+ (ContinuationFormat _ cont_id cont_frame_size live_regs)
= pack_frame curr_frame_size cont_frame_size maybe_header continuation_args
where
continuation_args = map (maybe Nothing (Just . CmmReg . CmmLocal))
(Just x, Just y) -> x /= y
_ -> isJust cont_id
- maybe_header = if allow_header_set && needs_header_set
+ maybe_header = if needs_header_set
then maybe Nothing (Just . CmmLit . CmmLabel . entryLblToInfoLbl) cont_id
else Nothing
mkOffsets size (Nothing:exprs) = mkOffsets (size+1) exprs
mkOffsets size (Just expr:exprs) = (expr, size):mkOffsets (size + width) exprs
where
- width = machRepByteWidth (cmmExprRep expr) `quot` wORD_SIZE
+ width = (widthInBytes $ typeWidth $ cmmExprType expr) `quot` wORD_SIZE
-- TODO: it would be better if we had a machRepWordWidth
spRel = curr_frame_size - next_frame_size
[global_get reg global
| (reg, RegisterParam global) <- argument_formats]
- argument_formats = assignArguments (localRegRep) formals
+ argument_formats = assignArguments (localRegType) formals
-- TODO: eliminate copy/paste with pack_continuation
curr_offsets = mkOffsets label_size live_regs
mkOffsets size (Nothing:regs) = mkOffsets (size+1) regs
mkOffsets size (Just reg:regs) = (reg, size):mkOffsets (size + width) regs
where
- width = machRepByteWidth (localRegRep reg) `quot` wORD_SIZE
+ width = (widthInBytes $ typeWidth $ localRegType reg) `quot` wORD_SIZE
-- TODO: it would be better if we had a machRepWordWidth
-----------------------------------------------------------------------------
stack_get spRel reg offset =
CmmAssign (CmmLocal reg)
(CmmLoad (CmmRegOff spReg (wORD_SIZE*(spRel + offset)))
- (localRegRep reg))
+ (localRegType reg))
global_put :: CmmExpr -> GlobalReg -> CmmStmt
global_put expr global = CmmAssign (CmmGlobal global) expr
global_get :: LocalReg -> GlobalReg -> CmmStmt
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