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|
-----------------------------------------------------------------------------
--
-- Pretty-printing assembly language
--
-- (c) The University of Glasgow 1993-2005
--
-----------------------------------------------------------------------------
module PprBase (
castFloatToWord8Array,
castDoubleToWord8Array,
floatToBytes,
doubleToBytes,
pprSectionHeader
)
where
import GhcPrelude
import AsmUtils
import CLabel
import Cmm
import DynFlags
import FastString
import Outputable
import Platform
import qualified Data.Array.Unsafe as U ( castSTUArray )
import Data.Array.ST
import Control.Monad.ST
import Data.Word
-- -----------------------------------------------------------------------------
-- Converting floating-point literals to integrals for printing
castFloatToWord8Array :: STUArray s Int Float -> ST s (STUArray s Int Word8)
castFloatToWord8Array = U.castSTUArray
castDoubleToWord8Array :: STUArray s Int Double -> ST s (STUArray s Int Word8)
castDoubleToWord8Array = U.castSTUArray
-- floatToBytes and doubleToBytes convert to the host's byte
-- order. Providing that we're not cross-compiling for a
-- target with the opposite endianness, this should work ok
-- on all targets.
-- ToDo: this stuff is very similar to the shenanigans in PprAbs,
-- could they be merged?
floatToBytes :: Float -> [Int]
floatToBytes f
= runST (do
arr <- newArray_ ((0::Int),3)
writeArray arr 0 f
arr <- castFloatToWord8Array arr
i0 <- readArray arr 0
i1 <- readArray arr 1
i2 <- readArray arr 2
i3 <- readArray arr 3
return (map fromIntegral [i0,i1,i2,i3])
)
doubleToBytes :: Double -> [Int]
doubleToBytes d
= runST (do
arr <- newArray_ ((0::Int),7)
writeArray arr 0 d
arr <- castDoubleToWord8Array arr
i0 <- readArray arr 0
i1 <- readArray arr 1
i2 <- readArray arr 2
i3 <- readArray arr 3
i4 <- readArray arr 4
i5 <- readArray arr 5
i6 <- readArray arr 6
i7 <- readArray arr 7
return (map fromIntegral [i0,i1,i2,i3,i4,i5,i6,i7])
)
-- ----------------------------------------------------------------------------
-- Printing section headers.
--
-- If -split-section was specified, include the suffix label, otherwise just
-- print the section type. For Darwin, where subsections-for-symbols are
-- used instead, only print section type.
--
-- For string literals, additional flags are specified to enable merging of
-- identical strings in the linker. With -split-sections each string also gets
-- a unique section to allow strings from unused code to be GC'd.
pprSectionHeader :: Platform -> Section -> SDoc
pprSectionHeader platform (Section t suffix) =
case platformOS platform of
OSAIX -> pprXcoffSectionHeader t
OSDarwin -> pprDarwinSectionHeader t
OSMinGW32 -> pprGNUSectionHeader (char '$') t suffix
_ -> pprGNUSectionHeader (char '.') t suffix
pprGNUSectionHeader :: SDoc -> SectionType -> CLabel -> SDoc
pprGNUSectionHeader sep t suffix = sdocWithDynFlags $ \dflags ->
let splitSections = gopt Opt_SplitSections dflags
subsection | splitSections = sep <> ppr suffix
| otherwise = empty
in text ".section " <> ptext (header dflags) <> subsection <>
flags dflags
where
header dflags = case t of
Text -> sLit ".text"
Data -> sLit ".data"
ReadOnlyData | OSMinGW32 <- platformOS (targetPlatform dflags)
-> sLit ".rdata"
| otherwise -> sLit ".rodata"
RelocatableReadOnlyData | OSMinGW32 <- platformOS (targetPlatform dflags)
-- Concept does not exist on Windows,
-- So map these to R/O data.
-> sLit ".rdata$rel.ro"
| otherwise -> sLit ".data.rel.ro"
UninitialisedData -> sLit ".bss"
ReadOnlyData16 | OSMinGW32 <- platformOS (targetPlatform dflags)
-> sLit ".rdata$cst16"
| otherwise -> sLit ".rodata.cst16"
CString
| OSMinGW32 <- platformOS (targetPlatform dflags)
-> sLit ".rdata"
| otherwise -> sLit ".rodata.str"
OtherSection _ ->
panic "PprBase.pprGNUSectionHeader: unknown section type"
flags dflags = case t of
CString
| OSMinGW32 <- platformOS (targetPlatform dflags)
-> empty
| otherwise -> text ",\"aMS\"," <> sectionType "progbits" <> text ",1"
_ -> empty
-- XCOFF doesn't support relocating label-differences, so we place all
-- RO sections into .text[PR] sections
pprXcoffSectionHeader :: SectionType -> SDoc
pprXcoffSectionHeader t = text $ case t of
Text -> ".csect .text[PR]"
Data -> ".csect .data[RW]"
ReadOnlyData -> ".csect .text[PR] # ReadOnlyData"
RelocatableReadOnlyData -> ".csect .text[PR] # RelocatableReadOnlyData"
ReadOnlyData16 -> ".csect .text[PR] # ReadOnlyData16"
CString -> ".csect .text[PR] # CString"
UninitialisedData -> ".csect .data[BS]"
OtherSection _ ->
panic "PprBase.pprXcoffSectionHeader: unknown section type"
pprDarwinSectionHeader :: SectionType -> SDoc
pprDarwinSectionHeader t =
ptext $ case t of
Text -> sLit ".text"
Data -> sLit ".data"
ReadOnlyData -> sLit ".const"
RelocatableReadOnlyData -> sLit ".const_data"
UninitialisedData -> sLit ".data"
ReadOnlyData16 -> sLit ".const"
CString -> sLit ".section\t__TEXT,__cstring,cstring_literals"
OtherSection _ ->
panic "PprBase.pprDarwinSectionHeader: unknown section type"
|
