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% (c) The University of Glasgow 2000-2006
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ByteCodeInstrs: Bytecode instruction definitions
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{-# OPTIONS_GHC -funbox-strict-fields #-}
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BCInstr(..), ProtoBCO(..), bciStackUse, BreakInfo (..)
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#include "HsVersions.h"
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#include "../includes/MachDeps.h"
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import ByteCodeItbls ( ItblPtr )
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import Module (Module)
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-- ----------------------------------------------------------------------------
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-- Bytecode instructions
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protoBCOName :: a, -- name, in some sense
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protoBCOInstrs :: [BCInstr], -- instrs
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protoBCOBitmap :: [StgWord],
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protoBCOBitmapSize :: Word16,
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-- what the BCO came from
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protoBCOExpr :: Either [AnnAlt Id VarSet] (AnnExpr Id VarSet),
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protoBCOPtrs :: [Either ItblPtr (Ptr ())]
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type LocalLabel = Word16
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-- Messing with the stack
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-- Push locals (existing bits of the stack)
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| PUSH_L !Word16{-offset-}
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| PUSH_LL !Word16 !Word16{-2 offsets-}
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| PUSH_LLL !Word16 !Word16 !Word16{-3 offsets-}
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-- Push a ptr (these all map to PUSH_G really)
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| PUSH_BCO (ProtoBCO Name)
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-- Push an alt continuation
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| PUSH_ALTS (ProtoBCO Name)
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| PUSH_ALTS_UNLIFTED (ProtoBCO Name) CgRep
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| PUSH_UBX (Either Literal (Ptr ())) Word16
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-- push this int/float/double/addr, on the stack. Word16
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-- is # of words to copy from literal pool. Eitherness reflects
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-- the difficulty of dealing with MachAddr here, mostly due to
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-- the excessive (and unnecessary) restrictions imposed by the
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-- designers of the new Foreign library. In particular it is
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-- quite impossible to convert an Addr to any other integral
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-- type, and it appears impossible to get hold of the bits of
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-- an addr, even though we need to to assemble BCOs.
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-- various kinds of application
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| SLIDE Word16{-this many-} Word16{-down by this much-}
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-- To do with the heap
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| ALLOC_AP !Word16 -- make an AP with this many payload words
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| ALLOC_AP_NOUPD !Word16 -- make an AP_NOUPD with this many payload words
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| ALLOC_PAP !Word16 !Word16 -- make a PAP with this arity / payload words
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| MKAP !Word16{-ptr to AP is this far down stack-} !Word16{-number of words-}
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| MKPAP !Word16{-ptr to PAP is this far down stack-} !Word16{-number of words-}
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| UNPACK !Word16 -- unpack N words from t.o.s Constr
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| PACK DataCon !Word16
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-- after assembly, the DataCon is an index into the
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-- For doing case trees
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| TESTLT_I Int LocalLabel
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| TESTEQ_I Int LocalLabel
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| TESTLT_W Word LocalLabel
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| TESTEQ_W Word LocalLabel
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| TESTLT_F Float LocalLabel
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| TESTEQ_F Float LocalLabel
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| TESTLT_D Double LocalLabel
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| TESTEQ_D Double LocalLabel
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-- The Word16 value is a constructor number and therefore
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-- stored in the insn stream rather than as an offset into
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| TESTLT_P Word16 LocalLabel
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| TESTEQ_P Word16 LocalLabel
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-- For doing calls to C (via glue code generated by ByteCodeFFI, or libffi)
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| CCALL Word16 -- stack frame size
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(Ptr ()) -- addr of the glue code
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-- For doing magic ByteArray passing to foreign calls
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| SWIZZLE Word16 -- to the ptr N words down the stack,
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Word16 -- add M (interpreted as a signed 16-bit entity)
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-- To Infinity And Beyond
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| RETURN -- return a lifted value
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| RETURN_UBX CgRep -- return an unlifted value, here's its rep
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| BRK_FUN (MutableByteArray# RealWorld) Word16 BreakInfo
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{ breakInfo_module :: Module
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, breakInfo_number :: {-# UNPACK #-} !Int
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, breakInfo_vars :: [(Id,Word16)]
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, breakInfo_resty :: Type
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instance Outputable BreakInfo where
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ppr info = text "BreakInfo" <+>
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parens (ppr (breakInfo_module info) <+>
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ppr (breakInfo_number info) <+>
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ppr (breakInfo_vars info) <+>
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ppr (breakInfo_resty info))
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-- -----------------------------------------------------------------------------
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-- Printing bytecode instructions
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instance Outputable a => Outputable (ProtoBCO a) where
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ppr (ProtoBCO name instrs bitmap bsize arity origin malloced)
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= (text "ProtoBCO" <+> ppr name <> char '#' <> int arity
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<+> text (show malloced) <> colon)
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$$ nest 6 (text "bitmap: " <+> text (show bsize) <+> text (show bitmap))
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$$ nest 6 (vcat (map ppr instrs))
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Left alts -> vcat (map (pprCoreAlt.deAnnAlt) alts)
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Right rhs -> pprCoreExpr (deAnnotate rhs)
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instance Outputable BCInstr where
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ppr (STKCHECK n) = text "STKCHECK" <+> ppr n
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ppr (PUSH_L offset) = text "PUSH_L " <+> ppr offset
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ppr (PUSH_LL o1 o2) = text "PUSH_LL " <+> ppr o1 <+> ppr o2
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ppr (PUSH_LLL o1 o2 o3) = text "PUSH_LLL" <+> ppr o1 <+> ppr o2 <+> ppr o3
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ppr (PUSH_G nm) = text "PUSH_G " <+> ppr nm
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ppr (PUSH_PRIMOP op) = text "PUSH_G " <+> text "GHC.PrimopWrappers."
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ppr (PUSH_BCO bco) = text "PUSH_BCO" <+> nest 3 (ppr bco)
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ppr (PUSH_ALTS bco) = text "PUSH_ALTS " <+> ppr bco
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ppr (PUSH_ALTS_UNLIFTED bco pk) = text "PUSH_ALTS_UNLIFTED " <+> ppr pk <+> ppr bco
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ppr (PUSH_UBX (Left lit) nw) = text "PUSH_UBX" <+> parens (ppr nw) <+> ppr lit
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ppr (PUSH_UBX (Right aa) nw) = text "PUSH_UBX" <+> parens (ppr nw) <+> text (show aa)
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ppr PUSH_APPLY_N = text "PUSH_APPLY_N"
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ppr PUSH_APPLY_V = text "PUSH_APPLY_V"
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ppr PUSH_APPLY_F = text "PUSH_APPLY_F"
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ppr PUSH_APPLY_D = text "PUSH_APPLY_D"
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ppr PUSH_APPLY_L = text "PUSH_APPLY_L"
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ppr PUSH_APPLY_P = text "PUSH_APPLY_P"
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ppr PUSH_APPLY_PP = text "PUSH_APPLY_PP"
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ppr PUSH_APPLY_PPP = text "PUSH_APPLY_PPP"
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ppr PUSH_APPLY_PPPP = text "PUSH_APPLY_PPPP"
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ppr PUSH_APPLY_PPPPP = text "PUSH_APPLY_PPPPP"
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ppr PUSH_APPLY_PPPPPP = text "PUSH_APPLY_PPPPPP"
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ppr (SLIDE n d) = text "SLIDE " <+> ppr n <+> ppr d
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ppr (ALLOC_AP sz) = text "ALLOC_AP " <+> ppr sz
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ppr (ALLOC_AP_NOUPD sz) = text "ALLOC_AP_NOUPD " <+> ppr sz
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ppr (ALLOC_PAP arity sz) = text "ALLOC_PAP " <+> ppr arity <+> ppr sz
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ppr (MKAP offset sz) = text "MKAP " <+> ppr sz <+> text "words,"
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<+> ppr offset <+> text "stkoff"
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ppr (MKPAP offset sz) = text "MKPAP " <+> ppr sz <+> text "words,"
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<+> ppr offset <+> text "stkoff"
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ppr (UNPACK sz) = text "UNPACK " <+> ppr sz
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ppr (PACK dcon sz) = text "PACK " <+> ppr dcon <+> ppr sz
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ppr (LABEL lab) = text "__" <> ppr lab <> colon
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ppr (TESTLT_I i lab) = text "TESTLT_I" <+> int i <+> text "__" <> ppr lab
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ppr (TESTEQ_I i lab) = text "TESTEQ_I" <+> int i <+> text "__" <> ppr lab
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ppr (TESTLT_W i lab) = text "TESTLT_W" <+> int (fromIntegral i) <+> text "__" <> ppr lab
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ppr (TESTEQ_W i lab) = text "TESTEQ_W" <+> int (fromIntegral i) <+> text "__" <> ppr lab
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ppr (TESTLT_F f lab) = text "TESTLT_F" <+> float f <+> text "__" <> ppr lab
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ppr (TESTEQ_F f lab) = text "TESTEQ_F" <+> float f <+> text "__" <> ppr lab
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ppr (TESTLT_D d lab) = text "TESTLT_D" <+> double d <+> text "__" <> ppr lab
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ppr (TESTEQ_D d lab) = text "TESTEQ_D" <+> double d <+> text "__" <> ppr lab
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ppr (TESTLT_P i lab) = text "TESTLT_P" <+> ppr i <+> text "__" <> ppr lab
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ppr (TESTEQ_P i lab) = text "TESTEQ_P" <+> ppr i <+> text "__" <> ppr lab
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ppr CASEFAIL = text "CASEFAIL"
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ppr (JMP lab) = text "JMP" <+> ppr lab
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ppr (CCALL off marshall_addr) = text "CCALL " <+> ppr off
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<+> text "marshall code at"
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<+> text (show marshall_addr)
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ppr (SWIZZLE stkoff n) = text "SWIZZLE " <+> text "stkoff" <+> ppr stkoff
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<+> text "by" <+> ppr n
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ppr ENTER = text "ENTER"
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ppr RETURN = text "RETURN"
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ppr (RETURN_UBX pk) = text "RETURN_UBX " <+> ppr pk
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ppr (BRK_FUN _breakArray index info) = text "BRK_FUN" <+> text "<array>" <+> ppr index <+> ppr info
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-- -----------------------------------------------------------------------------
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-- The stack use, in words, of each bytecode insn. These _must_ be
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-- correct, or overestimates of reality, to be safe.
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-- NOTE: we aggregate the stack use from case alternatives too, so that
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-- we can do a single stack check at the beginning of a function only.
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-- This could all be made more accurate by keeping track of a proper
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-- stack high water mark, but it doesn't seem worth the hassle.
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protoBCOStackUse :: ProtoBCO a -> Word
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protoBCOStackUse bco = sum (map bciStackUse (protoBCOInstrs bco))
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bciStackUse :: BCInstr -> Word
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bciStackUse STKCHECK{} = 0
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bciStackUse PUSH_L{} = 1
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bciStackUse PUSH_LL{} = 2
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bciStackUse PUSH_LLL{} = 3
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bciStackUse PUSH_G{} = 1
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bciStackUse PUSH_PRIMOP{} = 1
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bciStackUse PUSH_BCO{} = 1
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bciStackUse (PUSH_ALTS bco) = 2 + protoBCOStackUse bco
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bciStackUse (PUSH_ALTS_UNLIFTED bco _) = 2 + protoBCOStackUse bco
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bciStackUse (PUSH_UBX _ nw) = fromIntegral nw
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bciStackUse PUSH_APPLY_N{} = 1
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bciStackUse PUSH_APPLY_V{} = 1
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bciStackUse PUSH_APPLY_F{} = 1
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bciStackUse PUSH_APPLY_D{} = 1
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bciStackUse PUSH_APPLY_L{} = 1
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bciStackUse PUSH_APPLY_P{} = 1
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bciStackUse PUSH_APPLY_PP{} = 1
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bciStackUse PUSH_APPLY_PPP{} = 1
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bciStackUse PUSH_APPLY_PPPP{} = 1
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bciStackUse PUSH_APPLY_PPPPP{} = 1
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bciStackUse PUSH_APPLY_PPPPPP{} = 1
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bciStackUse ALLOC_AP{} = 1
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bciStackUse ALLOC_AP_NOUPD{} = 1
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bciStackUse ALLOC_PAP{} = 1
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bciStackUse (UNPACK sz) = fromIntegral sz
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bciStackUse LABEL{} = 0
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bciStackUse TESTLT_I{} = 0
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bciStackUse TESTEQ_I{} = 0
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bciStackUse TESTLT_W{} = 0
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bciStackUse TESTEQ_W{} = 0
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bciStackUse TESTLT_F{} = 0
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bciStackUse TESTEQ_F{} = 0
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bciStackUse TESTLT_D{} = 0
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bciStackUse TESTEQ_D{} = 0
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bciStackUse TESTLT_P{} = 0
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bciStackUse TESTEQ_P{} = 0
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bciStackUse CASEFAIL{} = 0
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bciStackUse JMP{} = 0
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bciStackUse ENTER{} = 0
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bciStackUse RETURN{} = 0
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bciStackUse RETURN_UBX{} = 1
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bciStackUse CCALL{} = 0
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bciStackUse SWIZZLE{} = 0
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bciStackUse BRK_FUN{} = 0
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-- These insns actually reduce stack use, but we need the high-tide level,
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-- so can't use this info. Not that it matters much.
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bciStackUse SLIDE{} = 0
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bciStackUse MKAP{} = 0
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bciStackUse MKPAP{} = 0
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bciStackUse PACK{} = 1 -- worst case is PACK 0 words