diff options
author | Michal Terepeta <michal.terepeta@gmail.com> | 2017-10-29 20:49:32 -0400 |
---|---|---|
committer | Ben Gamari <ben@smart-cactus.org> | 2017-10-29 21:51:05 -0400 |
commit | cca2d6b78f97bfb79bef4dc3f75d6c4d15b94680 (patch) | |
tree | 9be80ec91082ad99ba79d21a6cd0aac68309a236 /compiler | |
parent | 85aa1f4253163985fe07d172f8da73b784bb7b4b (diff) | |
download | haskell-cca2d6b78f97bfb79bef4dc3f75d6c4d15b94680.tar.gz |
Allow packing constructor fields
This is another step for fixing #13825 and is based on D38 by Simon
Marlow.
The change allows storing multiple constructor fields within the same
word. This currently applies only to `Float`s, e.g.,
```
data Foo = Foo {-# UNPACK #-} !Float {-# UNPACK #-} !Float
```
on 64-bit arch, will now store both fields within the same constructor
word. For `WordX/IntX` we'll need to introduce new primop types.
Main changes:
- We now use sizes in bytes when we compute the offsets for
constructor fields in `StgCmmLayout` and introduce padding if
necessary (word-sized fields are still word-aligned)
- `ByteCodeGen` had to be updated to correctly construct the data
types. This required some new bytecode instructions to allow pushing
things that are not full words onto the stack (and updating
`Interpreter.c`). Note that we only use the packed stuff when
constructing data types (i.e., for `PACK`), in all other cases the
behavior should not change.
- `RtClosureInspect` was changed to handle the new layout when
extracting subterms. This seems to be used by things like `:print`.
I've also added a test for this.
- I deviated slightly from Simon's approach and use `PrimRep` instead
of `ArgRep` for computing the size of fields. This seemed more
natural and in the future we'll probably want to introduce new
primitive types (e.g., `Int8#`) and `PrimRep` seems like a better
place to do that (where we already have `Int64Rep` for example).
`ArgRep` on the other hand seems to be more focused on calling
functions.
Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>
Test Plan: ./validate
Reviewers: bgamari, simonmar, austin, hvr, goldfire, erikd
Reviewed By: bgamari
Subscribers: maoe, rwbarton, thomie
GHC Trac Issues: #13825
Differential Revision: https://phabricator.haskell.org/D3809
Diffstat (limited to 'compiler')
-rw-r--r-- | compiler/cmm/CmmCallConv.hs | 5 | ||||
-rw-r--r-- | compiler/cmm/SMRep.hs | 9 | ||||
-rw-r--r-- | compiler/codeGen/StgCmmBind.hs | 2 | ||||
-rw-r--r-- | compiler/codeGen/StgCmmCon.hs | 15 | ||||
-rw-r--r-- | compiler/codeGen/StgCmmHeap.hs | 15 | ||||
-rw-r--r-- | compiler/codeGen/StgCmmLayout.hs | 93 | ||||
-rw-r--r-- | compiler/coreSyn/CoreLint.hs | 4 | ||||
-rw-r--r-- | compiler/ghci/ByteCodeAsm.hs | 15 | ||||
-rw-r--r-- | compiler/ghci/ByteCodeGen.hs | 84 | ||||
-rw-r--r-- | compiler/ghci/ByteCodeInstr.hs | 52 | ||||
-rw-r--r-- | compiler/ghci/RtClosureInspect.hs | 89 | ||||
-rw-r--r-- | compiler/main/Constants.hs | 4 | ||||
-rw-r--r-- | compiler/types/TyCon.hs | 35 |
13 files changed, 317 insertions, 105 deletions
diff --git a/compiler/cmm/CmmCallConv.hs b/compiler/cmm/CmmCallConv.hs index 0e89ce79f8..c32710e1b0 100644 --- a/compiler/cmm/CmmCallConv.hs +++ b/compiler/cmm/CmmCallConv.hs @@ -131,9 +131,10 @@ assignStack dflags offset arg_ty args = assign_stk offset [] (reverse args) assign_stk offset assts (r:rs) = assign_stk off' ((r, StackParam off') : assts) rs where w = typeWidth (arg_ty r) - size = (((widthInBytes w - 1) `div` word_size) + 1) * word_size off' = offset + size - word_size = wORD_SIZE dflags + -- Stack arguments always take a whole number of words, we never + -- pack them unlike constructor fields. + size = roundUpToWords dflags (widthInBytes w) ----------------------------------------------------------------------------- -- Local information about the registers available diff --git a/compiler/cmm/SMRep.hs b/compiler/cmm/SMRep.hs index 34048fe116..1469ae1bd3 100644 --- a/compiler/cmm/SMRep.hs +++ b/compiler/cmm/SMRep.hs @@ -9,7 +9,7 @@ module SMRep ( -- * Words and bytes WordOff, ByteOff, wordsToBytes, bytesToWordsRoundUp, - roundUpToWords, + roundUpToWords, roundUpTo, StgWord, fromStgWord, toStgWord, StgHalfWord, fromStgHalfWord, toStgHalfWord, @@ -79,8 +79,11 @@ type ByteOff = Int -- | Round up the given byte count to the next byte count that's a -- multiple of the machine's word size. roundUpToWords :: DynFlags -> ByteOff -> ByteOff -roundUpToWords dflags n = - (n + (wORD_SIZE dflags - 1)) .&. (complement (wORD_SIZE dflags - 1)) +roundUpToWords dflags n = roundUpTo n (wORD_SIZE dflags) + +-- | Round up @base@ to a multiple of @size@. +roundUpTo :: ByteOff -> ByteOff -> ByteOff +roundUpTo base size = (base + (size - 1)) .&. (complement (size - 1)) -- | Convert the given number of words to a number of bytes. -- diff --git a/compiler/codeGen/StgCmmBind.hs b/compiler/codeGen/StgCmmBind.hs index 8b2e998b5e..13f908e846 100644 --- a/compiler/codeGen/StgCmmBind.hs +++ b/compiler/codeGen/StgCmmBind.hs @@ -112,7 +112,7 @@ cgTopRhsClosure dflags rec id ccs _ upd_flag args body = -- BUILD THE OBJECT, AND GENERATE INFO TABLE (IF NECESSARY) ; emitDataLits closure_label closure_rep - ; let fv_details :: [(NonVoid Id, VirtualHpOffset)] + ; let fv_details :: [(NonVoid Id, ByteOff)] (_, _, fv_details) = mkVirtHeapOffsets dflags (isLFThunk lf_info) [] -- Don't drop the non-void args until the closure info has been made ; forkClosureBody (closureCodeBody True id closure_info ccs diff --git a/compiler/codeGen/StgCmmCon.hs b/compiler/codeGen/StgCmmCon.hs index 1540d00715..a38f7bce37 100644 --- a/compiler/codeGen/StgCmmCon.hs +++ b/compiler/codeGen/StgCmmCon.hs @@ -79,9 +79,16 @@ cgTopRhsCon dflags id con args = -- LAY IT OUT ; let + is_thunk = False (tot_wds, -- #ptr_wds + #nonptr_wds ptr_wds, -- #ptr_wds - nv_args_w_offsets) = mkVirtConstrOffsets dflags (addArgReps args) + nv_args_w_offsets) = + mkVirtHeapOffsetsWithPadding dflags is_thunk (addArgReps args) + + mk_payload (Padding len _) = return (CmmInt 0 (widthFromBytes len)) + mk_payload (FieldOff arg _) = do + CmmLit lit <- getArgAmode arg + return lit nonptr_wds = tot_wds - ptr_wds @@ -90,10 +97,8 @@ cgTopRhsCon dflags id con args = -- needs to poke around inside it. info_tbl = mkDataConInfoTable dflags con True ptr_wds nonptr_wds - get_lit (arg, _offset) = do { CmmLit lit <- getArgAmode arg - ; return lit } - ; payload <- mapM get_lit nv_args_w_offsets + ; payload <- mapM mk_payload nv_args_w_offsets -- NB1: nv_args_w_offsets is sorted into ptrs then non-ptrs -- NB2: all the amodes should be Lits! -- TODO (osa): Why? @@ -264,7 +269,7 @@ bindConArgs (DataAlt con) base args -- The binding below forces the masking out of the tag bits -- when accessing the constructor field. - bind_arg :: (NonVoid Id, VirtualHpOffset) -> FCode (Maybe LocalReg) + bind_arg :: (NonVoid Id, ByteOff) -> FCode (Maybe LocalReg) bind_arg (arg@(NonVoid b), offset) | isDeadBinder b = -- Do not load unused fields from objects to local variables. diff --git a/compiler/codeGen/StgCmmHeap.hs b/compiler/codeGen/StgCmmHeap.hs index 15dcaa2d89..790453619c 100644 --- a/compiler/codeGen/StgCmmHeap.hs +++ b/compiler/codeGen/StgCmmHeap.hs @@ -221,24 +221,11 @@ mkStaticClosure :: DynFlags -> CLabel -> CostCentreStack -> [CmmLit] mkStaticClosure dflags info_lbl ccs payload padding static_link_field saved_info_field = [CmmLabel info_lbl] ++ staticProfHdr dflags ccs - ++ concatMap (padLitToWord dflags) payload + ++ payload ++ padding ++ static_link_field ++ saved_info_field --- JD: Simon had elided this padding, but without it the C back end asserts --- failure. Maybe it's a bad assertion, and this padding is indeed unnecessary? -padLitToWord :: DynFlags -> CmmLit -> [CmmLit] -padLitToWord dflags lit = lit : padding pad_length - where width = typeWidth (cmmLitType dflags lit) - pad_length = wORD_SIZE dflags - widthInBytes width :: Int - - padding n | n <= 0 = [] - | n `rem` 2 /= 0 = CmmInt 0 W8 : padding (n-1) - | n `rem` 4 /= 0 = CmmInt 0 W16 : padding (n-2) - | n `rem` 8 /= 0 = CmmInt 0 W32 : padding (n-4) - | otherwise = CmmInt 0 W64 : padding (n-8) - ----------------------------------------------------------- -- Heap overflow checking ----------------------------------------------------------- diff --git a/compiler/codeGen/StgCmmLayout.hs b/compiler/codeGen/StgCmmLayout.hs index aeb01242e7..5111b93bc5 100644 --- a/compiler/codeGen/StgCmmLayout.hs +++ b/compiler/codeGen/StgCmmLayout.hs @@ -1,3 +1,4 @@ +{-# LANGUAGE BangPatterns #-} {-# LANGUAGE CPP #-} ----------------------------------------------------------------------------- @@ -17,7 +18,12 @@ module StgCmmLayout ( slowCall, directCall, - mkVirtHeapOffsets, mkVirtConstrOffsets, mkVirtConstrSizes, getHpRelOffset, + FieldOffOrPadding(..), + mkVirtHeapOffsets, + mkVirtHeapOffsetsWithPadding, + mkVirtConstrOffsets, + mkVirtConstrSizes, + getHpRelOffset, ArgRep(..), toArgRep, argRepSizeW -- re-exported from StgCmmArgRep ) where @@ -44,7 +50,7 @@ import CmmInfo import CLabel import StgSyn import Id -import TyCon ( PrimRep(..) ) +import TyCon ( PrimRep(..), primRepSizeB ) import BasicTypes ( RepArity ) import DynFlags import Module @@ -387,26 +393,33 @@ getHpRelOffset virtual_offset hp_usg <- getHpUsage return (cmmRegOffW dflags hpReg (hpRel (realHp hp_usg) virtual_offset)) -mkVirtHeapOffsets +data FieldOffOrPadding a + = FieldOff (NonVoid a) -- Something that needs an offset. + ByteOff -- Offset in bytes. + | Padding ByteOff -- Length of padding in bytes. + ByteOff -- Offset in bytes. + +mkVirtHeapOffsetsWithPadding :: DynFlags -> Bool -- True <=> is a thunk - -> [NonVoid (PrimRep,a)] -- Things to make offsets for - -> (WordOff, -- _Total_ number of words allocated - WordOff, -- Number of words allocated for *pointers* - [(NonVoid a, ByteOff)]) + -> [NonVoid (PrimRep, a)] -- Things to make offsets for + -> ( WordOff -- Total number of words allocated + , WordOff -- Number of words allocated for *pointers* + , [FieldOffOrPadding a] -- Either an offset or padding. + ) -- Things with their offsets from start of object in order of -- increasing offset; BUT THIS MAY BE DIFFERENT TO INPUT ORDER -- First in list gets lowest offset, which is initial offset + 1. -- --- mkVirtHeapOffsets always returns boxed things with smaller offsets +-- mkVirtHeapOffsetsWithPadding always returns boxed things with smaller offsets -- than the unboxed things -mkVirtHeapOffsets dflags is_thunk things - = ASSERT(not (any (isVoidRep . fst . fromNonVoid) things)) - ( bytesToWordsRoundUp dflags tot_bytes +mkVirtHeapOffsetsWithPadding dflags is_thunk things = + ASSERT(not (any (isVoidRep . fst . fromNonVoid) things)) + ( tot_wds , bytesToWordsRoundUp dflags bytes_of_ptrs - , ptrs_w_offsets ++ non_ptrs_w_offsets + , concat (ptrs_w_offsets ++ non_ptrs_w_offsets) ++ final_pad ) where hdr_words | is_thunk = thunkHdrSize dflags @@ -420,10 +433,58 @@ mkVirtHeapOffsets dflags is_thunk things (tot_bytes, non_ptrs_w_offsets) = mapAccumL computeOffset bytes_of_ptrs non_ptrs - computeOffset bytes_so_far nv_thing - = (bytes_so_far + wordsToBytes dflags (argRepSizeW dflags (toArgRep rep)), - (NonVoid thing, hdr_bytes + bytes_so_far)) - where (rep,thing) = fromNonVoid nv_thing + tot_wds = bytesToWordsRoundUp dflags tot_bytes + + final_pad_size = tot_wds * word_size - tot_bytes + final_pad + | final_pad_size > 0 = [(Padding final_pad_size + (hdr_bytes + tot_bytes))] + | otherwise = [] + + word_size = wORD_SIZE dflags + + computeOffset bytes_so_far nv_thing = + (new_bytes_so_far, with_padding field_off) + where + (rep, thing) = fromNonVoid nv_thing + + -- Size of the field in bytes. + !sizeB = primRepSizeB dflags rep + + -- Align the start offset (eg, 2-byte value should be 2-byte aligned). + -- But not more than to a word. + !align = min word_size sizeB + !start = roundUpTo bytes_so_far align + !padding = start - bytes_so_far + + -- Final offset is: + -- size of header + bytes_so_far + padding + !final_offset = hdr_bytes + bytes_so_far + padding + !new_bytes_so_far = start + sizeB + field_off = FieldOff (NonVoid thing) final_offset + + with_padding field_off + | padding == 0 = [field_off] + | otherwise = [ Padding padding (hdr_bytes + bytes_so_far) + , field_off + ] + + +mkVirtHeapOffsets + :: DynFlags + -> Bool -- True <=> is a thunk + -> [NonVoid (PrimRep,a)] -- Things to make offsets for + -> (WordOff, -- _Total_ number of words allocated + WordOff, -- Number of words allocated for *pointers* + [(NonVoid a, ByteOff)]) +mkVirtHeapOffsets dflags is_thunk things = + ( tot_wds + , ptr_wds + , [ (field, offset) | (FieldOff field offset) <- things_offsets ] + ) + where + (tot_wds, ptr_wds, things_offsets) = + mkVirtHeapOffsetsWithPadding dflags is_thunk things -- | Just like mkVirtHeapOffsets, but for constructors mkVirtConstrOffsets diff --git a/compiler/coreSyn/CoreLint.hs b/compiler/coreSyn/CoreLint.hs index 96c34852ba..20354ec530 100644 --- a/compiler/coreSyn/CoreLint.hs +++ b/compiler/coreSyn/CoreLint.hs @@ -1677,8 +1677,8 @@ lintCoercion co@(UnivCo prov r ty1 ty2) = do { dflags <- getDynFlags ; checkWarnL (isUnBoxed rep1 == isUnBoxed rep2) (report "between unboxed and boxed value") - ; checkWarnL (TyCon.primRepSizeW dflags rep1 - == TyCon.primRepSizeW dflags rep2) + ; checkWarnL (TyCon.primRepSizeB dflags rep1 + == TyCon.primRepSizeB dflags rep2) (report "between unboxed values of different size") ; let fl = liftM2 (==) (TyCon.primRepIsFloat rep1) (TyCon.primRepIsFloat rep2) diff --git a/compiler/ghci/ByteCodeAsm.hs b/compiler/ghci/ByteCodeAsm.hs index edb18df382..920bc4ac2b 100644 --- a/compiler/ghci/ByteCodeAsm.hs +++ b/compiler/ghci/ByteCodeAsm.hs @@ -351,6 +351,12 @@ assembleI dflags i = case i of PUSH_L o1 -> emit bci_PUSH_L [SmallOp o1] PUSH_LL o1 o2 -> emit bci_PUSH_LL [SmallOp o1, SmallOp o2] PUSH_LLL o1 o2 o3 -> emit bci_PUSH_LLL [SmallOp o1, SmallOp o2, SmallOp o3] + PUSH8 o1 -> emit bci_PUSH8 [SmallOp o1] + PUSH16 o1 -> emit bci_PUSH16 [SmallOp o1] + PUSH32 o1 -> emit bci_PUSH32 [SmallOp o1] + PUSH8_W o1 -> emit bci_PUSH8_W [SmallOp o1] + PUSH16_W o1 -> emit bci_PUSH16_W [SmallOp o1] + PUSH32_W o1 -> emit bci_PUSH32_W [SmallOp o1] PUSH_G nm -> do p <- ptr (BCOPtrName nm) emit bci_PUSH_G [Op p] PUSH_PRIMOP op -> do p <- ptr (BCOPtrPrimOp op) @@ -365,6 +371,15 @@ assembleI dflags i = case i of -> do let ul_bco = assembleBCO dflags proto p <- ioptr (liftM BCOPtrBCO ul_bco) emit (push_alts pk) [Op p] + PUSH_PAD8 -> emit bci_PUSH_PAD8 [] + PUSH_PAD16 -> emit bci_PUSH_PAD16 [] + PUSH_PAD32 -> emit bci_PUSH_PAD32 [] + PUSH_UBX8 lit -> do np <- literal lit + emit bci_PUSH_UBX8 [Op np] + PUSH_UBX16 lit -> do np <- literal lit + emit bci_PUSH_UBX16 [Op np] + PUSH_UBX32 lit -> do np <- literal lit + emit bci_PUSH_UBX32 [Op np] PUSH_UBX lit nws -> do np <- literal lit emit bci_PUSH_UBX [Op np, SmallOp nws] diff --git a/compiler/ghci/ByteCodeGen.hs b/compiler/ghci/ByteCodeGen.hs index c7b96a83a0..697dc63b43 100644 --- a/compiler/ghci/ByteCodeGen.hs +++ b/compiler/ghci/ByteCodeGen.hs @@ -47,8 +47,9 @@ import Unique import FastString import Panic import StgCmmClosure ( NonVoid(..), fromNonVoid, nonVoidIds ) -import StgCmmLayout ( ArgRep(..), toArgRep, argRepSizeW, - mkVirtHeapOffsets, mkVirtConstrOffsets ) +import StgCmmLayout ( ArgRep(..), FieldOffOrPadding(..), + toArgRep, argRepSizeW, + mkVirtHeapOffsetsWithPadding, mkVirtConstrOffsets ) import SMRep hiding (WordOff, ByteOff, wordsToBytes) import Bitmap import OrdList @@ -455,6 +456,9 @@ truncIntegral16 w | otherwise = fromIntegral w +trunc16B :: ByteOff -> Word16 +trunc16B = truncIntegral16 + trunc16W :: WordOff -> Word16 trunc16W = truncIntegral16 @@ -798,10 +802,13 @@ mkConAppCode orig_d _ p con args_r_to_l = , not (isVoidRep prim_rep) ] is_thunk = False - (_, _, args_offsets) = mkVirtHeapOffsets dflags is_thunk non_voids + (_, _, args_offsets) = + mkVirtHeapOffsetsWithPadding dflags is_thunk non_voids - do_pushery !d ((arg, _) : args) = do - (push, arg_bytes) <- pushAtom d p (fromNonVoid arg) + do_pushery !d (arg : args) = do + (push, arg_bytes) <- case arg of + (Padding l _) -> pushPadding l + (FieldOff a _) -> pushConstrAtom d p (fromNonVoid a) more_push_code <- do_pushery (d + arg_bytes) args return (push `appOL` more_push_code) do_pushery !d [] = do @@ -926,7 +933,8 @@ doCase d s p (_,scrut) bndr alts is_unboxed_tuple | otherwise = wordSize dflags -- depth of stack after the return value has been pushed - d_bndr = d + ret_frame_size_b + idSizeB dflags bndr + d_bndr = + d + ret_frame_size_b + wordsToBytes dflags (idSizeW dflags bndr) -- depth of stack after the extra info table for an unboxed return -- has been pushed, if any. This is the stack depth at the @@ -1127,8 +1135,7 @@ generateCCall d0 s p (CCallSpec target cconv safety) fn args_r_to_l code_n_reps <- pargs d0 args_r_to_l let (pushs_arg, a_reps_pushed_r_to_l) = unzip code_n_reps - a_reps_sizeW = - WordOff (sum (map (primRepSizeW dflags) a_reps_pushed_r_to_l)) + a_reps_sizeW = sum (map (repSizeWords dflags) a_reps_pushed_r_to_l) push_args = concatOL pushs_arg !d_after_args = d0 + wordsToBytes dflags a_reps_sizeW @@ -1218,7 +1225,7 @@ generateCCall d0 s p (CCallSpec target cconv safety) fn args_r_to_l -- Push the return placeholder. For a call returning nothing, -- this is a V (tag). - r_sizeW = WordOff (primRepSizeW dflags r_rep) + r_sizeW = repSizeWords dflags r_rep d_after_r = d_after_Addr + wordsToBytes dflags r_sizeW push_r = if returns_void @@ -1472,12 +1479,20 @@ pushAtom d p (AnnVar var) | Just d_v <- lookupBCEnv_maybe var p -- var is a local variable = do dflags <- getDynFlags - -- Currently this code assumes that @szb@ is a multiple of full words. - -- It'll need to change to support, e.g., sub-word constructor fields. - let !szb = idSizeB dflags var - !szw = bytesToWords dflags szb -- szb is a multiple of words - l = trunc16W $ bytesToWords dflags (d - d_v) + szw - 1 - return (toOL (genericReplicate szw (PUSH_L l)), szb) + + let !szb = idSizeCon dflags var + with_instr instr = do + let !off_b = trunc16B $ d - d_v + return (unitOL (instr off_b), wordSize dflags) + + case szb of + 1 -> with_instr PUSH8_W + 2 -> with_instr PUSH16_W + 4 -> with_instr PUSH32_W + _ -> do + let !szw = bytesToWords dflags szb + !off_w = trunc16W $ bytesToWords dflags (d - d_v) + szw - 1 + return (toOL (genericReplicate szw (PUSH_L off_w)), szb) -- d - d_v offset from TOS to the first slot of the object -- -- d - d_v + sz - 1 offset from the TOS of the last slot of the object @@ -1492,7 +1507,7 @@ pushAtom d p (AnnVar var) ptrToWordPtr $ fromRemotePtr ptr Nothing -> do dflags <- getDynFlags - let sz = idSizeB dflags var + let sz = idSizeCon dflags var MASSERT( sz == wordSize dflags ) return (unitOL (PUSH_G (getName var)), sz) @@ -1525,6 +1540,36 @@ pushAtom _ _ expr (pprCoreExpr (deAnnotate' expr)) +-- | Push an atom for constructor (i.e., PACK instruction) onto the stack. +-- This is slightly different to @pushAtom@ due to the fact that we allow +-- packing constructor fields. See also @mkConAppCode@ and @pushPadding@. +pushConstrAtom + :: StackDepth -> BCEnv -> AnnExpr' Id DVarSet -> BcM (BCInstrList, ByteOff) + +pushConstrAtom _ _ (AnnLit lit@(MachFloat _)) = + return (unitOL (PUSH_UBX32 lit), 4) + +pushConstrAtom d p (AnnVar v) + | Just d_v <- lookupBCEnv_maybe v p = do -- v is a local variable + dflags <- getDynFlags + let !szb = idSizeCon dflags v + done instr = do + let !off = trunc16B $ d - d_v + return (unitOL (instr off), szb) + case szb of + 1 -> done PUSH8 + 2 -> done PUSH16 + 4 -> done PUSH32 + _ -> pushAtom d p (AnnVar v) + +pushConstrAtom d p expr = pushAtom d p expr + +pushPadding :: Int -> BcM (BCInstrList, ByteOff) +pushPadding 1 = return (unitOL (PUSH_PAD8), 1) +pushPadding 2 = return (unitOL (PUSH_PAD16), 2) +pushPadding 4 = return (unitOL (PUSH_PAD32), 4) +pushPadding x = panic $ "pushPadding x=" ++ show x + -- ----------------------------------------------------------------------------- -- Given a bunch of alts code and their discrs, do the donkey work -- of making a multiway branch using a switch tree. @@ -1669,8 +1714,8 @@ lookupBCEnv_maybe = Map.lookup idSizeW :: DynFlags -> Id -> WordOff idSizeW dflags = WordOff . argRepSizeW dflags . bcIdArgRep -idSizeB :: DynFlags -> Id -> ByteOff -idSizeB dflags = wordsToBytes dflags . idSizeW dflags +idSizeCon :: DynFlags -> Id -> ByteOff +idSizeCon dflags = ByteOff . primRepSizeB dflags . bcIdPrimRep bcIdArgRep :: Id -> ArgRep bcIdArgRep = toArgRep . bcIdPrimRep @@ -1682,6 +1727,9 @@ bcIdPrimRep id | otherwise = pprPanic "bcIdPrimRep" (ppr id <+> dcolon <+> ppr (idType id)) +repSizeWords :: DynFlags -> PrimRep -> WordOff +repSizeWords dflags rep = WordOff $ argRepSizeW dflags (toArgRep rep) + isFollowableArg :: ArgRep -> Bool isFollowableArg P = True isFollowableArg _ = False diff --git a/compiler/ghci/ByteCodeInstr.hs b/compiler/ghci/ByteCodeInstr.hs index 7ef82206cb..07dcd2222a 100644 --- a/compiler/ghci/ByteCodeInstr.hs +++ b/compiler/ghci/ByteCodeInstr.hs @@ -62,6 +62,23 @@ data BCInstr | PUSH_LL !Word16 !Word16{-2 offsets-} | PUSH_LLL !Word16 !Word16 !Word16{-3 offsets-} + -- Push the specified local as a 8, 16, 32 bit value onto the stack. (i.e., + -- the stack will grow by 8, 16 or 32 bits) + | PUSH8 !Word16 + | PUSH16 !Word16 + | PUSH32 !Word16 + + -- Push the specifiec local as a 8, 16, 32 bit value onto the stack, but the + -- value will take the whole word on the stack (i.e., the stack will gorw by + -- a word) + -- This is useful when extracting a packed constructor field for further use. + -- Currently we expect all values on the stack to take full words, except for + -- the ones used for PACK (i.e., actually constracting new data types, in + -- which case we use PUSH{8,16,32}) + | PUSH8_W !Word16 + | PUSH16_W !Word16 + | PUSH32_W !Word16 + -- Push a ptr (these all map to PUSH_G really) | PUSH_G Name | PUSH_PRIMOP PrimOp @@ -71,8 +88,16 @@ data BCInstr | PUSH_ALTS (ProtoBCO Name) | PUSH_ALTS_UNLIFTED (ProtoBCO Name) ArgRep + -- Pushing 8, 16 and 32 bits of padding (for constructors). + | PUSH_PAD8 + | PUSH_PAD16 + | PUSH_PAD32 + -- Pushing literals - | PUSH_UBX Literal Word16 + | PUSH_UBX8 Literal + | PUSH_UBX16 Literal + | PUSH_UBX32 Literal + | PUSH_UBX Literal Word16 -- push this int/float/double/addr, on the stack. Word16 -- is # of words to copy from literal pool. Eitherness reflects -- the difficulty of dealing with MachAddr here, mostly due to @@ -194,6 +219,12 @@ instance Outputable BCInstr where ppr (PUSH_L offset) = text "PUSH_L " <+> ppr offset ppr (PUSH_LL o1 o2) = text "PUSH_LL " <+> ppr o1 <+> ppr o2 ppr (PUSH_LLL o1 o2 o3) = text "PUSH_LLL" <+> ppr o1 <+> ppr o2 <+> ppr o3 + ppr (PUSH8 offset) = text "PUSH8 " <+> ppr offset + ppr (PUSH16 offset) = text "PUSH16 " <+> ppr offset + ppr (PUSH32 offset) = text "PUSH32 " <+> ppr offset + ppr (PUSH8_W offset) = text "PUSH8_W " <+> ppr offset + ppr (PUSH16_W offset) = text "PUSH16_W " <+> ppr offset + ppr (PUSH32_W offset) = text "PUSH32_W " <+> ppr offset ppr (PUSH_G nm) = text "PUSH_G " <+> ppr nm ppr (PUSH_PRIMOP op) = text "PUSH_G " <+> text "GHC.PrimopWrappers." <> ppr op @@ -201,6 +232,13 @@ instance Outputable BCInstr where ppr (PUSH_ALTS bco) = hang (text "PUSH_ALTS") 2 (ppr bco) ppr (PUSH_ALTS_UNLIFTED bco pk) = hang (text "PUSH_ALTS_UNLIFTED" <+> ppr pk) 2 (ppr bco) + ppr PUSH_PAD8 = text "PUSH_PAD8" + ppr PUSH_PAD16 = text "PUSH_PAD16" + ppr PUSH_PAD32 = text "PUSH_PAD32" + + ppr (PUSH_UBX8 lit) = text "PUSH_UBX8" <+> ppr lit + ppr (PUSH_UBX16 lit) = text "PUSH_UBX16" <+> ppr lit + ppr (PUSH_UBX32 lit) = text "PUSH_UBX32" <+> ppr lit ppr (PUSH_UBX lit nw) = text "PUSH_UBX" <+> parens (ppr nw) <+> ppr lit ppr PUSH_APPLY_N = text "PUSH_APPLY_N" ppr PUSH_APPLY_V = text "PUSH_APPLY_V" @@ -269,11 +307,23 @@ bciStackUse STKCHECK{} = 0 bciStackUse PUSH_L{} = 1 bciStackUse PUSH_LL{} = 2 bciStackUse PUSH_LLL{} = 3 +bciStackUse PUSH8{} = 1 -- overapproximation +bciStackUse PUSH16{} = 1 -- overapproximation +bciStackUse PUSH32{} = 1 -- overapproximation on 64bit arch +bciStackUse PUSH8_W{} = 1 -- takes exactly 1 word +bciStackUse PUSH16_W{} = 1 -- takes exactly 1 word +bciStackUse PUSH32_W{} = 1 -- takes exactly 1 word bciStackUse PUSH_G{} = 1 bciStackUse PUSH_PRIMOP{} = 1 bciStackUse PUSH_BCO{} = 1 bciStackUse (PUSH_ALTS bco) = 2 + protoBCOStackUse bco bciStackUse (PUSH_ALTS_UNLIFTED bco _) = 2 + protoBCOStackUse bco +bciStackUse (PUSH_PAD8) = 1 -- overapproximation +bciStackUse (PUSH_PAD16) = 1 -- overapproximation +bciStackUse (PUSH_PAD32) = 1 -- overapproximation on 64bit arch +bciStackUse (PUSH_UBX8 _) = 1 -- overapproximation +bciStackUse (PUSH_UBX16 _) = 1 -- overapproximation +bciStackUse (PUSH_UBX32 _) = 1 -- overapproximation on 64bit arch bciStackUse (PUSH_UBX _ nw) = fromIntegral nw bciStackUse PUSH_APPLY_N{} = 1 bciStackUse PUSH_APPLY_V{} = 1 diff --git a/compiler/ghci/RtClosureInspect.hs b/compiler/ghci/RtClosureInspect.hs index 63d1886b4d..b85322d60e 100644 --- a/compiler/ghci/RtClosureInspect.hs +++ b/compiler/ghci/RtClosureInspect.hs @@ -60,6 +60,7 @@ import GHC.Arr ( Array(..) ) import GHC.Char import GHC.Exts import GHC.IO ( IO(..) ) +import SMRep ( roundUpTo ) import Control.Monad import Data.Maybe @@ -71,6 +72,7 @@ import Data.Sequence (viewl, ViewL(..)) import Foreign import System.IO.Unsafe + --------------------------------------------- -- * A representation of semi evaluated Terms --------------------------------------------- @@ -148,11 +150,13 @@ data ClosureType = Constr | Other Int deriving (Show, Eq) +data ClosureNonPtrs = ClosureNonPtrs ByteArray# + data Closure = Closure { tipe :: ClosureType , infoPtr :: Ptr () , infoTable :: StgInfoTable , ptrs :: Array Int HValue - , nonPtrs :: [Word] + , nonPtrs :: ClosureNonPtrs } instance Outputable ClosureType where @@ -184,8 +188,7 @@ getClosureData dflags a = let tipe = readCType (InfoTable.tipe itbl) elems = fromIntegral (InfoTable.ptrs itbl) ptrsList = Array 0 (elems - 1) elems ptrs - nptrs_data = [W# (indexWordArray# nptrs i) - | I# i <- [0.. fromIntegral (InfoTable.nptrs itbl)-1] ] + nptrs_data = ClosureNonPtrs nptrs ASSERT(elems >= 0) return () ptrsList `seq` return (Closure tipe iptr0 itbl ptrsList nptrs_data) @@ -793,47 +796,75 @@ cvObtainTerm hsc_env max_depth force old_ty hval = runTR hsc_env $ do extractSubTerms :: (Type -> HValue -> TcM Term) -> Closure -> [Type] -> TcM [Term] -extractSubTerms recurse clos = liftM thdOf3 . go 0 (nonPtrs clos) +extractSubTerms recurse clos = liftM thdOf3 . go 0 0 where - go ptr_i ws [] = return (ptr_i, ws, []) - go ptr_i ws (ty:tys) + !(ClosureNonPtrs array) = nonPtrs clos + + go ptr_i arr_i [] = return (ptr_i, arr_i, []) + go ptr_i arr_i (ty:tys) | Just (tc, elem_tys) <- tcSplitTyConApp_maybe ty , isUnboxedTupleTyCon tc -- See Note [Unboxed tuple RuntimeRep vars] in TyCon - = do (ptr_i, ws, terms0) <- go ptr_i ws (dropRuntimeRepArgs elem_tys) - (ptr_i, ws, terms1) <- go ptr_i ws tys - return (ptr_i, ws, unboxedTupleTerm ty terms0 : terms1) + = do (ptr_i, arr_i, terms0) <- + go ptr_i arr_i (dropRuntimeRepArgs elem_tys) + (ptr_i, arr_i, terms1) <- go ptr_i arr_i tys + return (ptr_i, arr_i, unboxedTupleTerm ty terms0 : terms1) | otherwise = case typePrimRepArgs ty of [rep_ty] -> do - (ptr_i, ws, term0) <- go_rep ptr_i ws ty rep_ty - (ptr_i, ws, terms1) <- go ptr_i ws tys - return (ptr_i, ws, term0 : terms1) + (ptr_i, arr_i, term0) <- go_rep ptr_i arr_i ty rep_ty + (ptr_i, arr_i, terms1) <- go ptr_i arr_i tys + return (ptr_i, arr_i, term0 : terms1) rep_tys -> do - (ptr_i, ws, terms0) <- go_unary_types ptr_i ws rep_tys - (ptr_i, ws, terms1) <- go ptr_i ws tys - return (ptr_i, ws, unboxedTupleTerm ty terms0 : terms1) + (ptr_i, arr_i, terms0) <- go_unary_types ptr_i arr_i rep_tys + (ptr_i, arr_i, terms1) <- go ptr_i arr_i tys + return (ptr_i, arr_i, unboxedTupleTerm ty terms0 : terms1) - go_unary_types ptr_i ws [] = return (ptr_i, ws, []) - go_unary_types ptr_i ws (rep_ty:rep_tys) = do + go_unary_types ptr_i arr_i [] = return (ptr_i, arr_i, []) + go_unary_types ptr_i arr_i (rep_ty:rep_tys) = do tv <- newVar liftedTypeKind - (ptr_i, ws, term0) <- go_rep ptr_i ws tv rep_ty - (ptr_i, ws, terms1) <- go_unary_types ptr_i ws rep_tys - return (ptr_i, ws, term0 : terms1) - - go_rep ptr_i ws ty rep - | isGcPtrRep rep - = do t <- appArr (recurse ty) (ptrs clos) ptr_i - return (ptr_i + 1, ws, t) - | otherwise - = do dflags <- getDynFlags - let (ws0, ws1) = splitAt (primRepSizeW dflags rep) ws - return (ptr_i, ws1, Prim ty ws0) + (ptr_i, arr_i, term0) <- go_rep ptr_i arr_i tv rep_ty + (ptr_i, arr_i, terms1) <- go_unary_types ptr_i arr_i rep_tys + return (ptr_i, arr_i, term0 : terms1) + + go_rep ptr_i arr_i ty rep + | isGcPtrRep rep = do + t <- appArr (recurse ty) (ptrs clos) ptr_i + return (ptr_i + 1, arr_i, t) + | otherwise = do + -- This is a bit involved since we allow packing multiple fields + -- within a single word. See also + -- StgCmmLayout.mkVirtHeapOffsetsWithPadding + dflags <- getDynFlags + let word_size = wORD_SIZE dflags + size_b = primRepSizeB dflags rep + -- Fields are always aligned. + !aligned_idx = roundUpTo arr_i size_b + !new_arr_i = aligned_idx + size_b + ws + | size_b < word_size = [index size_b array aligned_idx] + | otherwise = + let (q, r) = size_b `quotRem` word_size + in ASSERT( r == 0 ) + [ W# (indexWordArray# array i) + | o <- [0.. q - 1] + , let !(I# i) = (aligned_idx + o) `quot` word_size + ] + return (ptr_i, new_arr_i, Prim ty ws) unboxedTupleTerm ty terms = Term ty (Right (tupleDataCon Unboxed (length terms))) (error "unboxedTupleTerm: no HValue for unboxed tuple") terms + index item_size_b array (I# index_b) = + case item_size_b of + -- indexWord*Array# functions take offsets dependent not in bytes, + -- but in multiples of an element's size. + 1 -> W# (indexWord8Array# array index_b) + 2 -> W# (indexWord16Array# array (index_b `quotInt#` 2#)) + 4 -> W# (indexWord32Array# array (index_b `quotInt#` 4#)) + _ -> panic ("Weird byte-index: " ++ show (I# index_b)) + -- Fast, breadth-first Type reconstruction ------------------------------------------ diff --git a/compiler/main/Constants.hs b/compiler/main/Constants.hs index 06d93128e7..7eda130917 100644 --- a/compiler/main/Constants.hs +++ b/compiler/main/Constants.hs @@ -38,5 +38,9 @@ mAX_SOLVER_ITERATIONS = 4 wORD64_SIZE :: Int wORD64_SIZE = 8 +-- Size of float in bytes. +fLOAT_SIZE :: Int +fLOAT_SIZE = 4 + tARGET_MAX_CHAR :: Int tARGET_MAX_CHAR = 0x10ffff diff --git a/compiler/types/TyCon.hs b/compiler/types/TyCon.hs index 103c824bca..596c5f37ef 100644 --- a/compiler/types/TyCon.hs +++ b/compiler/types/TyCon.hs @@ -114,7 +114,8 @@ module TyCon( -- * Primitive representations of Types PrimRep(..), PrimElemRep(..), isVoidRep, isGcPtrRep, - primRepSizeW, primElemRepSizeB, + primRepSizeB, + primElemRepSizeB, primRepIsFloat, -- * Recursion breaking @@ -1340,19 +1341,25 @@ isGcPtrRep LiftedRep = True isGcPtrRep UnliftedRep = True isGcPtrRep _ = False --- | Find the size of a 'PrimRep', in words -primRepSizeW :: DynFlags -> PrimRep -> Int -primRepSizeW _ IntRep = 1 -primRepSizeW _ WordRep = 1 -primRepSizeW dflags Int64Rep = wORD64_SIZE `quot` wORD_SIZE dflags -primRepSizeW dflags Word64Rep = wORD64_SIZE `quot` wORD_SIZE dflags -primRepSizeW _ FloatRep = 1 -- NB. might not take a full word -primRepSizeW dflags DoubleRep = dOUBLE_SIZE dflags `quot` wORD_SIZE dflags -primRepSizeW _ AddrRep = 1 -primRepSizeW _ LiftedRep = 1 -primRepSizeW _ UnliftedRep = 1 -primRepSizeW _ VoidRep = 0 -primRepSizeW dflags (VecRep len rep) = len * primElemRepSizeB rep `quot` wORD_SIZE dflags +-- | The size of a 'PrimRep' in bytes. +-- +-- This applies also when used in a constructor, where we allow packing the +-- fields. For instance, in @data Foo = Foo Float# Float#@ the two fields will +-- take only 8 bytes, which for 64-bit arch will be equal to 1 word. +-- See also mkVirtHeapOffsetsWithPadding for details of how data fields are +-- layed out. +primRepSizeB :: DynFlags -> PrimRep -> Int +primRepSizeB dflags IntRep = wORD_SIZE dflags +primRepSizeB dflags WordRep = wORD_SIZE dflags +primRepSizeB _ Int64Rep = wORD64_SIZE +primRepSizeB _ Word64Rep = wORD64_SIZE +primRepSizeB _ FloatRep = fLOAT_SIZE +primRepSizeB dflags DoubleRep = dOUBLE_SIZE dflags +primRepSizeB dflags AddrRep = wORD_SIZE dflags +primRepSizeB dflags LiftedRep = wORD_SIZE dflags +primRepSizeB dflags UnliftedRep = wORD_SIZE dflags +primRepSizeB _ VoidRep = 0 +primRepSizeB _ (VecRep len rep) = len * primElemRepSizeB rep primElemRepSizeB :: PrimElemRep -> Int primElemRepSizeB Int8ElemRep = 1 |