+{-# 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/CodingStyle#Warnings
+-- for details
+
module CmmCPS (
-- | Converts C-- with full proceedures and parameters
-- to a CPS transformed C-- with the stack made manifest.
-- |Top level driver for the CPS pass
-----------------------------------------------------------------------------
cmmCPS :: DynFlags -- ^ Dynamic flags: -dcmm-lint -ddump-cps-cmm
- -> [GenCmm CmmStatic CmmInfo CmmStmt] -- ^ Input C-- with Proceedures
- -> IO [GenCmm CmmStatic CmmInfo CmmStmt] -- ^ Output CPS transformed C--
-cmmCPS dflags abstractC = do
- when (dopt Opt_DoCmmLinting dflags) $
- do showPass dflags "CmmLint"
- case firstJust $ map cmmLint abstractC of
- Just err -> do printDump err
- ghcExit dflags 1
- Nothing -> return ()
- showPass dflags "CPS"
+ -> [Cmm] -- ^ Input C-- with Proceedures
+ -> IO [Cmm] -- ^ Output CPS transformed C--
+cmmCPS dflags cmm_with_calls
+ = do { when (dopt Opt_DoCmmLinting dflags) $
+ do showPass dflags "CmmLint"
+ case firstJust $ map cmmLint cmm_with_calls of
+ Just err -> do printDump err
+ ghcExit dflags 1
+ Nothing -> return ()
+ ; showPass dflags "CPS"
-- TODO: more lint checking
-- check for use of branches to non-existant blocks
-- check for use of Sp, SpLim, R1, R2, etc.
- uniqSupply <- mkSplitUniqSupply 'p'
- let supplies = listSplitUniqSupply uniqSupply
- let doCpsProc s (Cmm c) =
- Cmm $ concat $ zipWith cpsProc (listSplitUniqSupply s) c
- let continuationC = zipWith doCpsProc supplies abstractC
+ ; uniqSupply <- mkSplitUniqSupply 'p'
+ ; let supplies = listSplitUniqSupply uniqSupply
+ ; let cpsd_cmm = zipWith doCpsProc supplies cmm_with_calls
- dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "CPS Cmm" (pprCmms continuationC)
+ ; dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "CPS Cmm" (pprCmms cpsd_cmm)
-- TODO: add option to dump Cmm to file
- return continuationC
+ ; return cpsd_cmm }
-make_stack_check stack_check_block_id info stack_use next_block_id =
- BasicBlock stack_check_block_id $
- check_stmts ++ [CmmBranch next_block_id]
- where
- check_stmts =
- case info of
- -- If we are given a stack check handler,
- -- then great, well check the stack.
- CmmInfo (Just gc_block) _ _
- -> [CmmCondBranch
- (CmmMachOp (MO_U_Lt $ cmmRegRep spReg)
- [CmmReg stack_use, CmmReg spLimReg])
- gc_block]
- -- If we aren't given a stack check handler,
- -- then humph! we just won't check the stack for them.
- CmmInfo Nothing _ _
- -> []
-----------------------------------------------------------------------------
-- |CPS a single CmmTop (proceedure)
-- Only 'CmmProc' are transformed 'CmmData' will be left alone.
-----------------------------------------------------------------------------
+doCpsProc :: UniqSupply -> Cmm -> Cmm
+doCpsProc s (Cmm c)
+ = Cmm $ concat $ zipWith cpsProc (listSplitUniqSupply s) c
+
cpsProc :: UniqSupply
- -> GenCmmTop CmmStatic CmmInfo CmmStmt -- ^Input proceedure
- -> [GenCmmTop CmmStatic CmmInfo CmmStmt] -- ^Output proceedure and continuations
+ -> CmmTop -- ^Input procedure
+ -> [CmmTop] -- ^Output procedures;
+ -- a single input procedure is converted to
+ -- multiple output procedures
-- Data blocks don't need to be CPS transformed
cpsProc uniqSupply proc@(CmmData _ _) = [proc]
-- Empty functions just don't work with the CPS algorithm, but
-- they don't need the transformation anyway so just output them directly
-cpsProc uniqSupply proc@(CmmProc _ _ _ []) = [proc]
+cpsProc uniqSupply proc@(CmmProc _ _ _ [])
+ = pprTrace "cpsProc: unexpected empty proc" (ppr proc) [proc]
-- CPS transform for those procs that actually need it
+-- The plan is this:
+--
+-- * Introduce a stack-check block as the first block
+-- * The first blocks gets a FunctionEntry; the rest are ControlEntry
+-- * Now break each block into a bunch of blocks (at call sites);
+-- all but the first will be ContinuationEntry
+--
cpsProc uniqSupply (CmmProc info ident params blocks) = cps_procs
where
-- We need to be generating uniques for several things.
(uniqSupply1, uniqSupply2) = splitUniqSupply uniqSupply
uniques :: [[Unique]]
uniques = map uniqsFromSupply $ listSplitUniqSupply uniqSupply1
- (stack_check_block_unique:stack_use_unique:info_uniques) :
- adaptor_uniques :
+ (stack_check_block_unique:stack_use_unique:adaptor_uniques) :
block_uniques = uniques
- proc_uniques = map (map uniqsFromSupply . listSplitUniqSupply) $ listSplitUniqSupply uniqSupply2
+ proc_uniques = map (map (map uniqsFromSupply . listSplitUniqSupply) . listSplitUniqSupply) $ listSplitUniqSupply uniqSupply2
stack_use = CmmLocal (LocalReg stack_use_unique (cmmRegRep spReg) KindPtr)
stack_check_block_id = BlockId stack_check_block_unique
cps_procs :: [CmmTop]
cps_procs = zipWith (continuationToProc formats' stack_use) proc_uniques continuations'
+make_stack_check stack_check_block_id info stack_use next_block_id =
+ BasicBlock stack_check_block_id $
+ check_stmts ++ [CmmBranch next_block_id]
+ where
+ check_stmts =
+ case info of
+ -- If we are given a stack check handler,
+ -- then great, well check the stack.
+ CmmInfo (Just gc_block) _ _
+ -> [CmmCondBranch
+ (CmmMachOp (MO_U_Lt $ cmmRegRep spReg)
+ [CmmReg stack_use, CmmReg spLimReg])
+ gc_block]
+ -- If we aren't given a stack check handler,
+ -- then humph! we just won't check the stack for them.
+ CmmInfo Nothing _ _
+ -> []
-----------------------------------------------------------------------------
collectNonProcPointTargets ::
argumentsSize (cmmExprRep . fst) args
final_arg_size (FinalJump _ args) =
argumentsSize (cmmExprRep . fst) args
- final_arg_size (FinalCall next _ _ args _ True) = 0
- final_arg_size (FinalCall next _ _ args _ False) =
+ final_arg_size (FinalCall next _ _ args _ _ True) = 0
+ final_arg_size (FinalCall next _ _ args _ _ False) =
-- We have to account for the stack used when we build a frame
-- for the *next* continuation from *this* continuation
argumentsSize (cmmExprRep . fst) args +
stmt_arg_size (CmmJump _ args) =
argumentsSize (cmmExprRep . fst) args
- stmt_arg_size (CmmCall _ _ _ (CmmSafe _)) =
+ stmt_arg_size (CmmCall _ _ _ (CmmSafe _) _) =
panic "Safe call in processFormats"
stmt_arg_size (CmmReturn _) =
panic "CmmReturn in processFormats"
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