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|
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# OPTIONS_GHC -funbox-strict-fields #-}
--
-- (c) The University of Glasgow 2002-2006
--
-- | Bytecode instruction definitions
module GHC.ByteCode.Instr (
BCInstr(..), ProtoBCO(..), bciStackUse, LocalLabel(..)
) where
import GHC.Prelude
import GHC.ByteCode.Types
import GHCi.RemoteTypes
import GHCi.FFI (C_ffi_cif)
import GHC.StgToCmm.Layout ( ArgRep(..) )
import GHC.Utils.Outputable
import GHC.Types.Name
import GHC.Types.Unique
import GHC.Types.Literal
import GHC.Core.DataCon
import GHC.Builtin.PrimOps
import GHC.Runtime.Heap.Layout
import Data.Int
import Data.Word
import GHC.Stack.CCS (CostCentre)
import GHC.Stg.Syntax
-- ----------------------------------------------------------------------------
-- Bytecode instructions
data ProtoBCO a
= ProtoBCO {
protoBCOName :: a, -- name, in some sense
protoBCOInstrs :: [BCInstr], -- instrs
-- arity and GC info
protoBCOBitmap :: [StgWord],
protoBCOBitmapSize :: Word16,
protoBCOArity :: Int,
-- what the BCO came from, for debugging only
protoBCOExpr :: Either [CgStgAlt] CgStgRhs,
-- malloc'd pointers
protoBCOFFIs :: [FFIInfo]
}
-- | A local block label (e.g. identifying a case alternative).
newtype LocalLabel = LocalLabel { getLocalLabel :: Word32 }
deriving (Eq, Ord)
instance Outputable LocalLabel where
ppr (LocalLabel lbl) = text "lbl:" <> ppr lbl
data BCInstr
-- Messing with the stack
= STKCHECK Word
-- Push locals (existing bits of the stack)
| PUSH_L !Word16{-offset-}
| 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 specified 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 grow 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 constructing 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
| PUSH_BCO (ProtoBCO Name)
-- Push an alt continuation
| PUSH_ALTS (ProtoBCO Name)
| PUSH_ALTS_UNLIFTED (ProtoBCO Name) ArgRep
| PUSH_ALTS_TUPLE (ProtoBCO Name) -- continuation
!NativeCallInfo
(ProtoBCO Name) -- tuple return BCO
-- Pushing 8, 16 and 32 bits of padding (for constructors).
| PUSH_PAD8
| PUSH_PAD16
| PUSH_PAD32
-- Pushing literals
| 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
-- the excessive (and unnecessary) restrictions imposed by the
-- designers of the new Foreign library. In particular it is
-- quite impossible to convert an Addr to any other integral
-- type, and it appears impossible to get hold of the bits of
-- an addr, even though we need to assemble BCOs.
-- Push a top-level Addr#. This is a pseudo-instruction assembled to PUSH_UBX,
-- see Note [Generating code for top-level string literal bindings] in GHC.StgToByteCode.
| PUSH_ADDR Name
-- various kinds of application
| PUSH_APPLY_N
| PUSH_APPLY_V
| PUSH_APPLY_F
| PUSH_APPLY_D
| PUSH_APPLY_L
| PUSH_APPLY_P
| PUSH_APPLY_PP
| PUSH_APPLY_PPP
| PUSH_APPLY_PPPP
| PUSH_APPLY_PPPPP
| PUSH_APPLY_PPPPPP
| SLIDE Word16{-this many-} Word16{-down by this much-}
-- To do with the heap
| ALLOC_AP !Word16 -- make an AP with this many payload words
| ALLOC_AP_NOUPD !Word16 -- make an AP_NOUPD with this many payload words
| ALLOC_PAP !Word16 !Word16 -- make a PAP with this arity / payload words
| MKAP !Word16{-ptr to AP is this far down stack-} !Word16{-number of words-}
| MKPAP !Word16{-ptr to PAP is this far down stack-} !Word16{-number of words-}
| UNPACK !Word16 -- unpack N words from t.o.s Constr
| PACK DataCon !Word16
-- after assembly, the DataCon is an index into the
-- itbl array
-- For doing case trees
| LABEL LocalLabel
| TESTLT_I Int LocalLabel
| TESTEQ_I Int LocalLabel
| TESTLT_W Word LocalLabel
| TESTEQ_W Word LocalLabel
| TESTLT_I64 Int64 LocalLabel
| TESTEQ_I64 Int64 LocalLabel
| TESTLT_I32 Int32 LocalLabel
| TESTEQ_I32 Int32 LocalLabel
| TESTLT_I16 Int16 LocalLabel
| TESTEQ_I16 Int16 LocalLabel
| TESTLT_I8 Int8 LocalLabel
| TESTEQ_I8 Int16 LocalLabel
| TESTLT_W64 Word64 LocalLabel
| TESTEQ_W64 Word64 LocalLabel
| TESTLT_W32 Word32 LocalLabel
| TESTEQ_W32 Word32 LocalLabel
| TESTLT_W16 Word16 LocalLabel
| TESTEQ_W16 Word16 LocalLabel
| TESTLT_W8 Word8 LocalLabel
| TESTEQ_W8 Word8 LocalLabel
| TESTLT_F Float LocalLabel
| TESTEQ_F Float LocalLabel
| TESTLT_D Double LocalLabel
| TESTEQ_D Double LocalLabel
-- The Word16 value is a constructor number and therefore
-- stored in the insn stream rather than as an offset into
-- the literal pool.
| TESTLT_P Word16 LocalLabel
| TESTEQ_P Word16 LocalLabel
| CASEFAIL
| JMP LocalLabel
-- For doing calls to C (via glue code generated by libffi)
| CCALL Word16 -- stack frame size
(RemotePtr C_ffi_cif) -- addr of the glue code
Word16 -- flags.
--
-- 0x1: call is interruptible
-- 0x2: call is unsafe
--
-- (XXX: inefficient, but I don't know
-- what the alignment constraints are.)
| PRIMCALL
-- For doing magic ByteArray passing to foreign calls
| SWIZZLE Word16 -- to the ptr N words down the stack,
Word16 -- add M (interpreted as a signed 16-bit entity)
-- To Infinity And Beyond
| ENTER
| RETURN -- return a lifted value
| RETURN_UNLIFTED ArgRep -- return an unlifted value, here's its rep
| RETURN_TUPLE -- return an unboxed tuple (info already on stack)
-- Breakpoints
| BRK_FUN Word16 Unique (RemotePtr CostCentre)
-- -----------------------------------------------------------------------------
-- Printing bytecode instructions
instance Outputable a => Outputable (ProtoBCO a) where
ppr (ProtoBCO { protoBCOName = name
, protoBCOInstrs = instrs
, protoBCOBitmap = bitmap
, protoBCOBitmapSize = bsize
, protoBCOArity = arity
, protoBCOExpr = origin
, protoBCOFFIs = ffis })
= (text "ProtoBCO" <+> ppr name <> char '#' <> int arity
<+> text (show ffis) <> colon)
$$ nest 3 (case origin of
Left alts ->
vcat (zipWith (<+>) (char '{' : repeat (char ';'))
(map (pprStgAltShort shortStgPprOpts) alts))
Right rhs ->
pprStgRhsShort shortStgPprOpts rhs
)
$$ nest 3 (text "bitmap: " <+> text (show bsize) <+> ppr bitmap)
$$ nest 3 (vcat (map ppr instrs))
-- Print enough of the STG expression to enable the reader to find
-- the expression in the -ddump-stg output. That is, we need to
-- include at least a binder.
pprStgExprShort :: OutputablePass pass => StgPprOpts -> GenStgExpr pass -> SDoc
pprStgExprShort _ (StgCase _expr var _ty _alts) =
text "case of" <+> ppr var
pprStgExprShort _ (StgLet _ bnd _) =
text "let" <+> pprStgBindShort bnd <+> text "in ..."
pprStgExprShort _ (StgLetNoEscape _ bnd _) =
text "let-no-escape" <+> pprStgBindShort bnd <+> text "in ..."
pprStgExprShort opts (StgTick t e) = ppr t <+> pprStgExprShort opts e
pprStgExprShort opts e = pprStgExpr opts e
pprStgBindShort :: OutputablePass pass => GenStgBinding pass -> SDoc
pprStgBindShort (StgNonRec x _) =
ppr x <+> text "= ..."
pprStgBindShort (StgRec bs) =
char '{' <+> ppr (fst (head bs)) <+> text "= ...; ... }"
pprStgAltShort :: OutputablePass pass => StgPprOpts -> GenStgAlt pass -> SDoc
pprStgAltShort opts GenStgAlt{alt_con=con, alt_bndrs=args, alt_rhs=expr} =
ppr con <+> sep (map ppr args) <+> text "->" <+> pprStgExprShort opts expr
pprStgRhsShort :: OutputablePass pass => StgPprOpts -> GenStgRhs pass -> SDoc
pprStgRhsShort opts (StgRhsClosure _ext _cc upd_flag args body _typ) =
hang (hsep [ char '\\' <> ppr upd_flag, brackets (interppSP args) ])
4 (pprStgExprShort opts body)
pprStgRhsShort opts rhs = pprStgRhs opts rhs
instance Outputable BCInstr where
ppr (STKCHECK n) = text "STKCHECK" <+> ppr n
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
ppr (PUSH_BCO bco) = hang (text "PUSH_BCO") 2 (ppr bco)
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_ALTS_TUPLE bco call_info tuple_bco) =
hang (text "PUSH_ALTS_TUPLE" <+> ppr call_info)
2
(ppr tuple_bco $+$ 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_ADDR nm) = text "PUSH_ADDR" <+> ppr nm
ppr PUSH_APPLY_N = text "PUSH_APPLY_N"
ppr PUSH_APPLY_V = text "PUSH_APPLY_V"
ppr PUSH_APPLY_F = text "PUSH_APPLY_F"
ppr PUSH_APPLY_D = text "PUSH_APPLY_D"
ppr PUSH_APPLY_L = text "PUSH_APPLY_L"
ppr PUSH_APPLY_P = text "PUSH_APPLY_P"
ppr PUSH_APPLY_PP = text "PUSH_APPLY_PP"
ppr PUSH_APPLY_PPP = text "PUSH_APPLY_PPP"
ppr PUSH_APPLY_PPPP = text "PUSH_APPLY_PPPP"
ppr PUSH_APPLY_PPPPP = text "PUSH_APPLY_PPPPP"
ppr PUSH_APPLY_PPPPPP = text "PUSH_APPLY_PPPPPP"
ppr (SLIDE n d) = text "SLIDE " <+> ppr n <+> ppr d
ppr (ALLOC_AP sz) = text "ALLOC_AP " <+> ppr sz
ppr (ALLOC_AP_NOUPD sz) = text "ALLOC_AP_NOUPD " <+> ppr sz
ppr (ALLOC_PAP arity sz) = text "ALLOC_PAP " <+> ppr arity <+> ppr sz
ppr (MKAP offset sz) = text "MKAP " <+> ppr sz <+> text "words,"
<+> ppr offset <+> text "stkoff"
ppr (MKPAP offset sz) = text "MKPAP " <+> ppr sz <+> text "words,"
<+> ppr offset <+> text "stkoff"
ppr (UNPACK sz) = text "UNPACK " <+> ppr sz
ppr (PACK dcon sz) = text "PACK " <+> ppr dcon <+> ppr sz
ppr (LABEL lab) = text "__" <> ppr lab <> colon
ppr (TESTLT_I i lab) = text "TESTLT_I" <+> int i <+> text "__" <> ppr lab
ppr (TESTEQ_I i lab) = text "TESTEQ_I" <+> int i <+> text "__" <> ppr lab
ppr (TESTLT_W i lab) = text "TESTLT_W" <+> int (fromIntegral i) <+> text "__" <> ppr lab
ppr (TESTEQ_W i lab) = text "TESTEQ_W" <+> int (fromIntegral i) <+> text "__" <> ppr lab
ppr (TESTLT_I64 i lab) = text "TESTLT_I64" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_I64 i lab) = text "TESTEQ_I64" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_I32 i lab) = text "TESTLT_I32" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_I32 i lab) = text "TESTEQ_I32" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_I16 i lab) = text "TESTLT_I16" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_I16 i lab) = text "TESTEQ_I16" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_I8 i lab) = text "TESTLT_I8" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_I8 i lab) = text "TESTEQ_I8" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_W64 i lab) = text "TESTLT_W64" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_W64 i lab) = text "TESTEQ_W64" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_W32 i lab) = text "TESTLT_W32" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_W32 i lab) = text "TESTEQ_W32" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_W16 i lab) = text "TESTLT_W16" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_W16 i lab) = text "TESTEQ_W16" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_W8 i lab) = text "TESTLT_W8" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_W8 i lab) = text "TESTEQ_W8" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTLT_F f lab) = text "TESTLT_F" <+> float f <+> text "__" <> ppr lab
ppr (TESTEQ_F f lab) = text "TESTEQ_F" <+> float f <+> text "__" <> ppr lab
ppr (TESTLT_D d lab) = text "TESTLT_D" <+> double d <+> text "__" <> ppr lab
ppr (TESTEQ_D d lab) = text "TESTEQ_D" <+> double d <+> text "__" <> ppr lab
ppr (TESTLT_P i lab) = text "TESTLT_P" <+> ppr i <+> text "__" <> ppr lab
ppr (TESTEQ_P i lab) = text "TESTEQ_P" <+> ppr i <+> text "__" <> ppr lab
ppr CASEFAIL = text "CASEFAIL"
ppr (JMP lab) = text "JMP" <+> ppr lab
ppr (CCALL off marshal_addr flags) = text "CCALL " <+> ppr off
<+> text "marshal code at"
<+> text (show marshal_addr)
<+> (case flags of
0x1 -> text "(interruptible)"
0x2 -> text "(unsafe)"
_ -> empty)
ppr PRIMCALL = text "PRIMCALL"
ppr (SWIZZLE stkoff n) = text "SWIZZLE " <+> text "stkoff" <+> ppr stkoff
<+> text "by" <+> ppr n
ppr ENTER = text "ENTER"
ppr RETURN = text "RETURN"
ppr (RETURN_UNLIFTED pk) = text "RETURN_UNLIFTED " <+> ppr pk
ppr (RETURN_TUPLE) = text "RETURN_TUPLE"
ppr (BRK_FUN index uniq _cc) = text "BRK_FUN" <+> ppr index <+> mb_uniq <+> text "<cc>"
where mb_uniq = sdocOption sdocSuppressUniques $ \case
True -> text "<uniq>"
False -> ppr uniq
-- -----------------------------------------------------------------------------
-- The stack use, in words, of each bytecode insn. These _must_ be
-- correct, or overestimates of reality, to be safe.
-- NOTE: we aggregate the stack use from case alternatives too, so that
-- we can do a single stack check at the beginning of a function only.
-- This could all be made more accurate by keeping track of a proper
-- stack high water mark, but it doesn't seem worth the hassle.
protoBCOStackUse :: ProtoBCO a -> Word
protoBCOStackUse bco = sum (map bciStackUse (protoBCOInstrs bco))
bciStackUse :: BCInstr -> Word
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 {- profiling only, restore CCCS -} +
3 + protoBCOStackUse bco
bciStackUse (PUSH_ALTS_UNLIFTED bco _) = 2 {- profiling only, restore CCCS -} +
4 + protoBCOStackUse bco
bciStackUse (PUSH_ALTS_TUPLE bco info _) =
-- (tuple_bco, call_info word, cont_bco, stg_ctoi_t)
-- tuple
-- (call_info, tuple_bco, stg_ret_t)
1 {- profiling only -} +
7 + fromIntegral (nativeCallSize info) + 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_ADDR{} = 1
bciStackUse PUSH_APPLY_N{} = 1
bciStackUse PUSH_APPLY_V{} = 1
bciStackUse PUSH_APPLY_F{} = 1
bciStackUse PUSH_APPLY_D{} = 1
bciStackUse PUSH_APPLY_L{} = 1
bciStackUse PUSH_APPLY_P{} = 1
bciStackUse PUSH_APPLY_PP{} = 1
bciStackUse PUSH_APPLY_PPP{} = 1
bciStackUse PUSH_APPLY_PPPP{} = 1
bciStackUse PUSH_APPLY_PPPPP{} = 1
bciStackUse PUSH_APPLY_PPPPPP{} = 1
bciStackUse ALLOC_AP{} = 1
bciStackUse ALLOC_AP_NOUPD{} = 1
bciStackUse ALLOC_PAP{} = 1
bciStackUse (UNPACK sz) = fromIntegral sz
bciStackUse LABEL{} = 0
bciStackUse TESTLT_I{} = 0
bciStackUse TESTEQ_I{} = 0
bciStackUse TESTLT_W{} = 0
bciStackUse TESTEQ_W{} = 0
bciStackUse TESTLT_I64{} = 0
bciStackUse TESTEQ_I64{} = 0
bciStackUse TESTLT_I32{} = 0
bciStackUse TESTEQ_I32{} = 0
bciStackUse TESTLT_I16{} = 0
bciStackUse TESTEQ_I16{} = 0
bciStackUse TESTLT_I8{} = 0
bciStackUse TESTEQ_I8{} = 0
bciStackUse TESTLT_W64{} = 0
bciStackUse TESTEQ_W64{} = 0
bciStackUse TESTLT_W32{} = 0
bciStackUse TESTEQ_W32{} = 0
bciStackUse TESTLT_W16{} = 0
bciStackUse TESTEQ_W16{} = 0
bciStackUse TESTLT_W8{} = 0
bciStackUse TESTEQ_W8{} = 0
bciStackUse TESTLT_F{} = 0
bciStackUse TESTEQ_F{} = 0
bciStackUse TESTLT_D{} = 0
bciStackUse TESTEQ_D{} = 0
bciStackUse TESTLT_P{} = 0
bciStackUse TESTEQ_P{} = 0
bciStackUse CASEFAIL{} = 0
bciStackUse JMP{} = 0
bciStackUse ENTER{} = 0
bciStackUse RETURN{} = 0
bciStackUse RETURN_UNLIFTED{} = 1 -- pushes stg_ret_X for some X
bciStackUse RETURN_TUPLE{} = 1 -- pushes stg_ret_t header
bciStackUse CCALL{} = 0
bciStackUse PRIMCALL{} = 1 -- pushes stg_primcall
bciStackUse SWIZZLE{} = 0
bciStackUse BRK_FUN{} = 0
-- These insns actually reduce stack use, but we need the high-tide level,
-- so can't use this info. Not that it matters much.
bciStackUse SLIDE{} = 0
bciStackUse MKAP{} = 0
bciStackUse MKPAP{} = 0
bciStackUse PACK{} = 1 -- worst case is PACK 0 words
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