--
-- Building info tables.
--
--- (c) The University of Glasgow 2004
+-- (c) The University of Glasgow 2004-2006
--
-----------------------------------------------------------------------------
+{-# 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 CgInfoTbls (
emitClosureCodeAndInfoTable,
emitInfoTableAndCode,
dataConTagZ,
- getSRTInfo,
- emitDirectReturnTarget, emitAlgReturnTarget,
- emitDirectReturnInstr, emitVectoredReturnInstr,
- mkRetInfoTable,
- mkStdInfoTable,
+ emitReturnTarget, emitAlgReturnTarget,
+ emitReturnInstr,
stdInfoTableSizeB,
- mkFunGenInfoExtraBits,
entryCode, closureInfoPtr,
getConstrTag,
+ cmmGetClosureType,
infoTable, infoTableClosureType,
infoTablePtrs, infoTableNonPtrs,
- funInfoTable,
- retVec
+ funInfoTable, makeRelativeRefTo
) where
#include "HsVersions.h"
-import ClosureInfo ( ClosureInfo, closureTypeDescr, closureName,
- infoTableLabelFromCI, Liveness,
- closureValDescr, closureSRT, closureSMRep,
- closurePtrsSize, closureNonHdrSize, closureFunInfo,
- C_SRT(..), needsSRT, isConstrClosure_maybe,
- ArgDescr(..) )
-import SMRep ( StgHalfWord, hALF_WORD_SIZE_IN_BITS, hALF_WORD_SIZE,
- WordOff, ByteOff,
- smRepClosureTypeInt, tablesNextToCode,
- rET_BIG, rET_SMALL, rET_VEC_BIG, rET_VEC_SMALL )
-import CgBindery ( getLiveStackSlots )
-import CgCallConv ( isBigLiveness, mkLivenessCLit, buildContLiveness,
- argDescrType, getSequelAmode,
- CtrlReturnConvention(..) )
-import CgUtils ( mkStringCLit, packHalfWordsCLit, mkWordCLit,
- cmmOffsetB, cmmOffsetExprW, cmmLabelOffW, cmmOffsetW,
- emitDataLits, emitRODataLits, emitSwitch, cmmNegate,
- newTemp )
+import ClosureInfo
+import SMRep
+import CgBindery
+import CgCallConv
+import CgUtils
import CgMonad
-import CmmUtils ( mkIntCLit, zeroCLit )
-import Cmm ( CmmStmt(..), CmmExpr(..), CmmLit(..), LocalReg,
- CmmBasicBlock, nodeReg )
+import CmmUtils
+import Cmm
import MachOp
import CLabel
-import StgSyn ( SRT(..) )
-import Name ( Name )
-import DataCon ( DataCon, dataConTag, fIRST_TAG )
-import Unique ( Uniquable(..) )
-import DynFlags ( DynFlags(..), HscTarget(..) )
-import StaticFlags ( opt_SccProfilingOn )
-import ListSetOps ( assocDefault )
-import Maybes ( isJust )
-import Constants ( wORD_SIZE, sIZEOF_StgFunInfoExtraRev )
+import StgSyn
+import Name
+import DataCon
+import Unique
+import StaticFlags
+
+import Maybes
+import Constants
+import Panic
+import Util
import Outputable
-
-------------------------------------------------------------------------
--
-- Generating the info table and code for a closure
--
-------------------------------------------------------------------------
--- Here we make a concrete info table, represented as a list of CmmAddr
--- (it can't be simply a list of Word, because the SRT field is
--- represented by a label+offset expression).
+-- Here we make an info table of type 'CmmInfo'. The concrete
+-- representation as a list of 'CmmAddr' is handled later
+-- in the pipeline by 'cmmToRawCmm'.
--- With tablesNextToCode, the layout is
--- <reversed variable part>
--- <normal forward StgInfoTable, but without
--- an entry point at the front>
--- <code>
---
--- Without tablesNextToCode, the layout of an info table is
--- <entry label>
--- <normal forward rest of StgInfoTable>
--- <forward variable part>
---
--- See includes/InfoTables.h
-
-emitClosureCodeAndInfoTable :: ClosureInfo -> [LocalReg] -> CgStmts -> Code
+emitClosureCodeAndInfoTable :: ClosureInfo -> CmmFormals -> CgStmts -> Code
emitClosureCodeAndInfoTable cl_info args body
- = do { ty_descr_lit <-
- if opt_SccProfilingOn
- then mkStringCLit (closureTypeDescr cl_info)
- else return (mkIntCLit 0)
- ; cl_descr_lit <-
- if opt_SccProfilingOn
- then mkStringCLit cl_descr_string
- else return (mkIntCLit 0)
- ; let std_info = mkStdInfoTable ty_descr_lit cl_descr_lit
- cl_type srt_len layout_lit
-
- ; blks <- cgStmtsToBlocks body
- ; emitInfoTableAndCode info_lbl std_info extra_bits args blks }
+ = do { blks <- cgStmtsToBlocks body
+ ; info <- mkCmmInfo cl_info
+ ; emitInfoTableAndCode (infoLblToEntryLbl info_lbl) info args blks }
where
info_lbl = infoTableLabelFromCI cl_info
- cl_descr_string = closureValDescr cl_info
- cl_type = smRepClosureTypeInt (closureSMRep cl_info)
-
- srt = closureSRT cl_info
- needs_srt = needsSRT srt
-
- mb_con = isConstrClosure_maybe cl_info
- is_con = isJust mb_con
-
- (srt_label,srt_len)
- = case mb_con of
- Just con -> -- Constructors don't have an SRT
- -- We keep the *zero-indexed* tag in the srt_len
- -- field of the info table.
- (mkIntCLit 0, fromIntegral (dataConTagZ con))
-
- Nothing -> -- Not a constructor
- srtLabelAndLength srt info_lbl
-
- ptrs = closurePtrsSize cl_info
- nptrs = size - ptrs
- size = closureNonHdrSize cl_info
- layout_lit = packHalfWordsCLit ptrs nptrs
-
- extra_bits
- | is_fun = fun_extra_bits
- | is_con = []
- | needs_srt = [srt_label]
- | otherwise = []
-
- maybe_fun_stuff = closureFunInfo cl_info
- is_fun = isJust maybe_fun_stuff
- (Just (arity, arg_descr)) = maybe_fun_stuff
-
- fun_extra_bits
- | ArgGen liveness <- arg_descr
- = [ fun_amode,
- srt_label,
- makeRelativeRefTo info_lbl $ mkLivenessCLit liveness,
- slow_entry ]
- | needs_srt = [fun_amode, srt_label]
- | otherwise = [fun_amode]
-
- slow_entry = makeRelativeRefTo info_lbl (CmmLabel slow_entry_label)
- slow_entry_label = mkSlowEntryLabel (closureName cl_info)
-
- fun_amode = packHalfWordsCLit fun_type arity
- fun_type = argDescrType arg_descr
-
-- We keep the *zero-indexed* tag in the srt_len field of the info
-- table of a data constructor.
dataConTagZ :: DataCon -> ConTagZ
dataConTagZ con = dataConTag con - fIRST_TAG
--- A low-level way to generate the variable part of a fun-style info table.
--- (must match fun_extra_bits above). Used by the C-- parser.
-mkFunGenInfoExtraBits :: Int -> Int -> CmmLit -> CmmLit -> CmmLit -> [CmmLit]
-mkFunGenInfoExtraBits fun_type arity srt_label liveness slow_entry
- = [ packHalfWordsCLit fun_type arity,
- srt_label,
- liveness,
- slow_entry ]
+-- Convert from 'ClosureInfo' to 'CmmInfo'.
+-- Not used for return points. (The 'smRepClosureTypeInt' call would panic.)
+mkCmmInfo :: ClosureInfo -> FCode CmmInfo
+mkCmmInfo cl_info = do
+ prof <-
+ if opt_SccProfilingOn
+ then do ty_descr_lit <- mkStringCLit (closureTypeDescr cl_info)
+ cl_descr_lit <- mkStringCLit (closureValDescr cl_info)
+ return $ ProfilingInfo ty_descr_lit cl_descr_lit
+ else return $ ProfilingInfo (mkIntCLit 0) (mkIntCLit 0)
+
+ case cl_info of
+ ConInfo { closureCon = con } -> do
+ cstr <- mkByteStringCLit $ dataConIdentity con
+ let conName = makeRelativeRefTo info_lbl cstr
+ info = ConstrInfo (ptrs, nptrs)
+ (fromIntegral (dataConTagZ con))
+ conName
+ return $ CmmInfo gc_target Nothing (CmmInfoTable prof cl_type info)
+
+ ClosureInfo { closureName = name,
+ closureLFInfo = lf_info,
+ closureSRT = srt } ->
+ return $ CmmInfo gc_target Nothing (CmmInfoTable prof cl_type info)
+ where
+ info =
+ case lf_info of
+ LFReEntrant _ arity _ arg_descr ->
+ FunInfo (ptrs, nptrs)
+ srt
+ (argDescrType arg_descr)
+ (fromIntegral arity)
+ arg_descr
+ (CmmLabel (mkSlowEntryLabel name))
+ LFThunk _ _ _ (SelectorThunk offset) _ ->
+ ThunkSelectorInfo (fromIntegral offset) srt
+ LFThunk _ _ _ _ _ ->
+ ThunkInfo (ptrs, nptrs) srt
+ _ -> panic "unexpected lambda form in mkCmmInfo"
+ where
+ info_lbl = infoTableLabelFromCI cl_info
+
+ cl_type = smRepClosureTypeInt (closureSMRep cl_info)
+
+ ptrs = fromIntegral $ closurePtrsSize cl_info
+ size = fromIntegral $ closureNonHdrSize cl_info
+ nptrs = size - ptrs
+
+ -- The gc_target is to inform the CPS pass when it inserts a stack check.
+ -- Since that pass isn't used yet we'll punt for now.
+ -- When the CPS pass is fully integrated, this should
+ -- be replaced by the label that any heap check jumped to,
+ -- so that branch can be shared by both the heap (from codeGen)
+ -- and stack checks (from the CPS pass).
+ gc_target = panic "TODO: gc_target"
-------------------------------------------------------------------------
--
--
-------------------------------------------------------------------------
--- Here's the layout of a return-point info table
---
--- Tables next to code:
---
--- <reversed vector table>
--- <srt slot>
--- <standard info table>
--- ret-addr --> <entry code (if any)>
---
--- Not tables-next-to-code:
---
--- ret-addr --> <ptr to entry code>
--- <standard info table>
--- <srt slot>
--- <forward vector table>
---
--- * The vector table is only present for vectored returns
---
--- * The SRT slot is only there if either
--- (a) there is SRT info to record, OR
--- (b) if the return is vectored
--- The latter (b) is necessary so that the vector is in a
--- predictable place
-
-vectorSlot :: CmmExpr -> CmmExpr -> CmmExpr
--- Get the vector slot from the info pointer
-vectorSlot info_amode zero_indexed_tag
- | tablesNextToCode
- = cmmOffsetExprW (cmmOffsetW info_amode (- (stdInfoTableSizeW + 2)))
- (cmmNegate zero_indexed_tag)
- -- The "2" is one for the SRT slot, and one more
- -- to get to the first word of the vector
-
- | otherwise
- = cmmOffsetExprW (cmmOffsetW info_amode (stdInfoTableSizeW + 2))
- zero_indexed_tag
- -- The "2" is one for the entry-code slot and one for the SRT slot
-
-retVec :: CmmExpr -> CmmExpr -> CmmExpr
--- Get a return vector from the info pointer
-retVec info_amode zero_indexed_tag
- = let slot = vectorSlot info_amode zero_indexed_tag
-#ifdef x86_64_TARGET_ARCH
- tableEntry = CmmMachOp (MO_S_Conv I32 I64) [CmmLoad slot I32]
- -- offsets are 32-bits on x86-64, due to the inability of
- -- the tools to handle 64-bit PC-relative relocations. See also
- -- PprMach.pprDataItem, and InfoTables.h:OFFSET_FIELD().
-#else
- tableEntry = CmmLoad slot wordRep
-#endif
- in if tablesNextToCode
- then CmmMachOp (MO_Add wordRep) [tableEntry, info_amode]
- else tableEntry
-
+-- The concrete representation as a list of 'CmmAddr' is handled later
+-- in the pipeline by 'cmmToRawCmm'.
+
emitReturnTarget
:: Name
-> CgStmts -- The direct-return code (if any)
- -- (empty for vectored returns)
- -> [CmmLit] -- Vector of return points
- -- (empty for non-vectored returns)
- -> SRT
-> FCode CLabel
-emitReturnTarget name stmts vector srt
- = do { live_slots <- getLiveStackSlots
- ; liveness <- buildContLiveness name live_slots
- ; srt_info <- getSRTInfo name srt
-
- ; let
- cl_type = case (null vector, isBigLiveness liveness) of
- (True, True) -> rET_BIG
- (True, False) -> rET_SMALL
- (False, True) -> rET_VEC_BIG
- (False, False) -> rET_VEC_SMALL
-
- (std_info, extra_bits) =
- mkRetInfoTable info_lbl liveness srt_info cl_type vector
-
+emitReturnTarget name stmts
+ = do { srt_info <- getSRTInfo
; blks <- cgStmtsToBlocks stmts
- ; emitInfoTableAndCode info_lbl std_info extra_bits args blks
+ ; frame <- mkStackLayout
+ ; let info = CmmInfo
+ gc_target
+ Nothing
+ (CmmInfoTable
+ (ProfilingInfo zeroCLit zeroCLit)
+ rET_SMALL -- cmmToRawCmm may convert it to rET_BIG
+ (ContInfo frame srt_info))
+ ; emitInfoTableAndCode (infoLblToEntryLbl info_lbl) info args blks
; return info_lbl }
where
args = {- trace "emitReturnTarget: missing args" -} []
uniq = getUnique name
info_lbl = mkReturnInfoLabel uniq
+ -- The gc_target is to inform the CPS pass when it inserts a stack check.
+ -- Since that pass isn't used yet we'll punt for now.
+ -- When the CPS pass is fully integrated, this should
+ -- be replaced by the label that any heap check jumped to,
+ -- so that branch can be shared by both the heap (from codeGen)
+ -- and stack checks (from the CPS pass).
+ gc_target = panic "TODO: gc_target"
+
-mkRetInfoTable
- :: CLabel -- info label
- -> Liveness -- liveness
- -> C_SRT -- SRT Info
- -> Int -- type (eg. rET_SMALL)
- -> [CmmLit] -- vector
- -> ([CmmLit],[CmmLit])
-mkRetInfoTable info_lbl liveness srt_info cl_type vector
- = (std_info, extra_bits)
+-- Build stack layout information from the state of the 'FCode' monad.
+-- Should go away once 'codeGen' starts using the CPS conversion
+-- pass to handle the stack. Until then, this is really just
+-- here to convert from the 'codeGen' representation of the stack
+-- to the 'CmmInfo' representation of the stack.
+--
+-- See 'CmmInfo.mkLiveness' for where this is converted to a bitmap.
+
+{-
+This seems to be a very error prone part of the code.
+It is surprisingly prone to off-by-one errors, because
+it converts between offset form (codeGen) and list form (CmmInfo).
+Thus a bit of explanation is in order.
+Fortunately, this code should go away once the code generator
+starts using the CPS conversion pass to handle the stack.
+
+The stack looks like this:
+
+ | |
+ |-------------|
+frame_sp --> | return addr |
+ |-------------|
+ | dead slot |
+ |-------------|
+ | live ptr b |
+ |-------------|
+ | live ptr a |
+ |-------------|
+real_sp --> | return addr |
+ +-------------+
+
+Both 'frame_sp' and 'real_sp' are measured downwards
+(i.e. larger frame_sp means smaller memory address).
+
+For that frame we want a result like: [Just a, Just b, Nothing]
+Note that the 'head' of the list is the top
+of the stack, and that the return address
+is not present in the list (it is always assumed).
+-}
+mkStackLayout :: FCode [Maybe LocalReg]
+mkStackLayout = do
+ StackUsage { realSp = real_sp,
+ frameSp = frame_sp } <- getStkUsage
+ binds <- getLiveStackBindings
+ let frame_size = real_sp - frame_sp - retAddrSizeW
+ rel_binds = reverse $ sortWith fst
+ [(offset - frame_sp - retAddrSizeW, b)
+ | (offset, b) <- binds]
+
+ WARN( not (all (\bind -> fst bind >= 0) rel_binds),
+ ppr binds $$ ppr rel_binds $$
+ ppr frame_size $$ ppr real_sp $$ ppr frame_sp )
+ return $ stack_layout rel_binds frame_size
+
+stack_layout :: [(VirtualSpOffset, CgIdInfo)]
+ -> WordOff
+ -> [Maybe LocalReg]
+stack_layout [] sizeW = replicate sizeW Nothing
+stack_layout ((off, bind):binds) sizeW | off == sizeW - 1 =
+ (Just stack_bind) : (stack_layout binds (sizeW - rep_size))
where
- (srt_label, srt_len) = srtLabelAndLength srt_info info_lbl
-
- srt_slot | need_srt = [srt_label]
- | otherwise = []
-
- need_srt = needsSRT srt_info || not (null vector)
- -- If there's a vector table then we must allocate
- -- an SRT slot, so that the vector table is at a
- -- known offset from the info pointer
-
- liveness_lit = makeRelativeRefTo info_lbl $ mkLivenessCLit liveness
- std_info = mkStdInfoTable zeroCLit zeroCLit cl_type srt_len liveness_lit
- extra_bits = srt_slot ++ map (makeRelativeRefTo info_lbl) vector
-
-
-emitDirectReturnTarget
- :: Name
- -> CgStmts -- The direct-return code
- -> SRT
- -> FCode CLabel
-emitDirectReturnTarget name code srt
- = emitReturnTarget name code [] srt
+ rep_size = cgRepSizeW (cgIdInfoArgRep bind)
+ stack_bind = LocalReg unique machRep kind
+ unique = getUnique (cgIdInfoId bind)
+ machRep = argMachRep (cgIdInfoArgRep bind)
+ kind = if isFollowableArg (cgIdInfoArgRep bind)
+ then KindPtr
+ else KindNonPtr
+stack_layout binds@((off, _):_) sizeW | otherwise =
+ Nothing : (stack_layout binds (sizeW - 1))
+
+{- Another way to write the function that might be less error prone (untested)
+stack_layout offsets sizeW = result
+ where
+ y = map (flip lookup offsets) [0..]
+ -- offsets -> nothing and just (each slot is one word)
+ x = take sizeW y -- set the frame size
+ z = clip x -- account for multi-word slots
+ result = map mk_reg z
+
+ clip [] = []
+ clip list@(x : _) = x : clip (drop count list)
+ ASSERT(all isNothing (tail (take count list)))
+
+ count Nothing = 1
+ count (Just x) = cgRepSizeW (cgIdInfoArgRep x)
+
+ mk_reg Nothing = Nothing
+ mk_reg (Just x) = LocalReg unique machRep kind
+ where
+ unique = getUnique (cgIdInfoId x)
+ machRep = argMachrep (cgIdInfoArgRep bind)
+ kind = if isFollowableArg (cgIdInfoArgRep bind)
+ then KindPtr
+ else KindNonPtr
+-}
emitAlgReturnTarget
:: Name -- Just for its unique
-> [(ConTagZ, CgStmts)] -- Tagged branches
-> Maybe CgStmts -- Default branch (if any)
- -> SRT -- Continuation's SRT
- -> CtrlReturnConvention
+ -> Int -- family size
-> FCode (CLabel, SemiTaggingStuff)
-emitAlgReturnTarget name branches mb_deflt srt ret_conv
- = case ret_conv of
- UnvectoredReturn fam_sz -> do
- { blks <- getCgStmts $
- emitSwitch tag_expr branches mb_deflt 0 (fam_sz - 1)
- -- NB: tag_expr is zero-based
- ; lbl <- emitDirectReturnTarget name blks srt
+emitAlgReturnTarget name branches mb_deflt fam_sz
+ = do { blks <- getCgStmts $
+ -- is the constructor tag in the node reg?
+ if isSmallFamily fam_sz
+ then do -- yes, node has constr. tag
+ let tag_expr = cmmConstrTag1 (CmmReg nodeReg)
+ branches' = [(tag+1,branch)|(tag,branch)<-branches]
+ emitSwitch tag_expr branches' mb_deflt 1 fam_sz
+ else do -- no, get tag from info table
+ let -- Note that ptr _always_ has tag 1
+ -- when the family size is big enough
+ untagged_ptr = cmmRegOffB nodeReg (-1)
+ tag_expr = getConstrTag (untagged_ptr)
+ emitSwitch tag_expr branches mb_deflt 0 (fam_sz - 1)
+ ; lbl <- emitReturnTarget name blks
; return (lbl, Nothing) }
-- Nothing: the internal branches in the switch don't have
-- global labels, so we can't use them at the 'call site'
-
- VectoredReturn fam_sz -> do
- { let tagged_lbls = zip (map fst branches) $
- map (CmmLabel . mkAltLabel uniq . fst) branches
- deflt_lbl | isJust mb_deflt = CmmLabel $ mkDefaultLabel uniq
- | otherwise = mkIntCLit 0
- ; let vector = [ assocDefault deflt_lbl tagged_lbls i
- | i <- [0..fam_sz-1]]
- ; lbl <- emitReturnTarget name noCgStmts vector srt
- ; mapFCs emit_alt branches
- ; emit_deflt mb_deflt
- ; return (lbl, Just (tagged_lbls, deflt_lbl)) }
where
uniq = getUnique name
- tag_expr = getConstrTag (CmmReg nodeReg)
-
- emit_alt :: (Int, CgStmts) -> FCode (Int, CmmLit)
- -- Emit the code for the alternative as a top-level
- -- code block returning a label for it
- emit_alt (tag, stmts) = do { let lbl = mkAltLabel uniq tag
- ; blks <- cgStmtsToBlocks stmts
- ; emitProc [] lbl [] blks
- ; return (tag, CmmLabel lbl) }
-
- emit_deflt (Just stmts) = do { let lbl = mkDefaultLabel uniq
- ; blks <- cgStmtsToBlocks stmts
- ; emitProc [] lbl [] blks
- ; return (CmmLabel lbl) }
- emit_deflt Nothing = return (mkIntCLit 0)
- -- Nothing case: the simplifier might have eliminated a case
- -- so we may have e.g. case xs of
- -- [] -> e
- -- In that situation the default should never be taken,
- -- so we just use a NULL pointer
--------------------------------
-emitDirectReturnInstr :: Code
-emitDirectReturnInstr
+emitReturnInstr :: Code
+emitReturnInstr
= do { info_amode <- getSequelAmode
; stmtC (CmmJump (entryCode info_amode) []) }
-emitVectoredReturnInstr :: CmmExpr -- _Zero-indexed_ constructor tag
- -> Code
-emitVectoredReturnInstr zero_indexed_tag
- = do { info_amode <- getSequelAmode
- -- HACK! assign info_amode to a temp, because retVec
- -- uses it twice and the NCG doesn't have any CSE yet.
- -- Only do this for the NCG, because gcc is too stupid
- -- to optimise away the extra tmp (grrr).
- ; dflags <- getDynFlags
- ; x <- if hscTarget dflags == HscAsm
- then do z <- newTemp wordRep
- stmtC (CmmAssign z info_amode)
- return (CmmReg z)
- else
- return info_amode
- ; let target = retVec x zero_indexed_tag
- ; stmtC (CmmJump target []) }
-
-
--------------------------------------------------------------------------
---
--- Generating a standard info table
+-----------------------------------------------------------------------------
--
--------------------------------------------------------------------------
-
--- The standard bits of an info table. This part of the info table
--- corresponds to the StgInfoTable type defined in InfoTables.h.
+-- Info table offsets
--
--- Its shape varies with ticky/profiling/tables next to code etc
--- so we can't use constant offsets from Constants
-
-mkStdInfoTable
- :: CmmLit -- closure type descr (profiling)
- -> CmmLit -- closure descr (profiling)
- -> Int -- closure type
- -> StgHalfWord -- SRT length
- -> CmmLit -- layout field
- -> [CmmLit]
-
-mkStdInfoTable type_descr closure_descr cl_type srt_len layout_lit
- = -- Parallel revertible-black hole field
- prof_info
- -- Ticky info (none at present)
- -- Debug info (none at present)
- ++ [layout_lit, type_lit]
-
- where
- prof_info
- | opt_SccProfilingOn = [type_descr, closure_descr]
- | otherwise = []
-
- type_lit = packHalfWordsCLit cl_type srt_len
+-----------------------------------------------------------------------------
stdInfoTableSizeW :: WordOff
-- The size of a standard info table varies with profiling/ticky etc,
where
info_table = infoTable (closureInfoPtr closure_ptr)
+cmmGetClosureType :: CmmExpr -> CmmExpr
+-- Takes a closure pointer, and return the closure type
+-- obtained from the info table
+cmmGetClosureType closure_ptr
+ = CmmMachOp (MO_U_Conv halfWordRep wordRep) [infoTableClosureType info_table]
+ where
+ info_table = infoTable (closureInfoPtr closure_ptr)
+
infoTable :: CmmExpr -> CmmExpr
-- Takes an info pointer (the first word of a closure)
-- and returns a pointer to the first word of the standard-form
-- put the info table next to the code
emitInfoTableAndCode
- :: CLabel -- Label of info table
- -> [CmmLit] -- ...its invariant part
- -> [CmmLit] -- ...and its variant part
- -> [LocalReg] -- ...args
+ :: CLabel -- Label of entry or ret
+ -> CmmInfo -- ...the info table
+ -> CmmFormals -- ...args
-> [CmmBasicBlock] -- ...and body
-> Code
-emitInfoTableAndCode info_lbl std_info extra_bits args blocks
- | tablesNextToCode -- Reverse the extra_bits; and emit the top-level proc
- = emitProc (reverse extra_bits ++ std_info)
- entry_lbl args blocks
- -- NB: the info_lbl is discarded
-
- | null blocks -- No actual code; only the info table is significant
- = -- Use a zero place-holder in place of the
- -- entry-label in the info table
- emitRODataLits info_lbl (zeroCLit : std_info ++ extra_bits)
-
- | otherwise -- Separately emit info table (with the function entry
- = -- point as first entry) and the entry code
- do { emitDataLits info_lbl (CmmLabel entry_lbl : std_info ++ extra_bits)
- ; emitProc [] entry_lbl args blocks }
-
- where
- entry_lbl = infoLblToEntryLbl info_lbl
+emitInfoTableAndCode entry_ret_lbl info args blocks
+ = emitProc info entry_ret_lbl args blocks
-------------------------------------------------------------------------
--
--
-------------------------------------------------------------------------
--- There is just one SRT for each top level binding; all the nested
--- bindings use sub-sections of this SRT. The label is passed down to
--- the nested bindings via the monad.
-
-getSRTInfo :: Name -> SRT -> FCode C_SRT
-getSRTInfo id NoSRT = return NoC_SRT
-getSRTInfo id (SRT off len bmp)
- | len > hALF_WORD_SIZE_IN_BITS || bmp == [fromIntegral srt_escape]
- = do { srt_lbl <- getSRTLabel
- ; let srt_desc_lbl = mkSRTDescLabel id
- ; emitRODataLits srt_desc_lbl
- ( cmmLabelOffW srt_lbl off
- : mkWordCLit (fromIntegral len)
- : map mkWordCLit bmp)
- ; return (C_SRT srt_desc_lbl 0 srt_escape) }
-
- | otherwise
- = do { srt_lbl <- getSRTLabel
- ; return (C_SRT srt_lbl off (fromIntegral (head bmp))) }
- -- The fromIntegral converts to StgHalfWord
-
-srt_escape = (-1) :: StgHalfWord
-
srtLabelAndLength :: C_SRT -> CLabel -> (CmmLit, StgHalfWord)
srtLabelAndLength NoC_SRT _
= (zeroCLit, 0)
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