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|
{-# OPTIONS -fno-warn-tabs #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and
-- detab the module (please do the detabbing in a separate patch). See
-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
-- for details
module CmmCallConv (
ParamLocation(..),
assignArgumentsPos,
globalArgRegs
) where
#include "HsVersions.h"
import CmmExpr
import SMRep
import Cmm (Convention(..))
import PprCmm ()
import qualified Data.List as L
import DynFlags
import Outputable
-- Calculate the 'GlobalReg' or stack locations for function call
-- parameters as used by the Cmm calling convention.
data ParamLocation
= RegisterParam GlobalReg
| StackParam ByteOff
instance Outputable ParamLocation where
ppr (RegisterParam g) = ppr g
ppr (StackParam p) = ppr p
-- | JD: For the new stack story, I want arguments passed on the stack to manifest as
-- positive offsets in a CallArea, not negative offsets from the stack pointer.
-- Also, I want byte offsets, not word offsets.
assignArgumentsPos :: DynFlags -> Convention -> (a -> CmmType) -> [a] ->
[(a, ParamLocation)]
-- Given a list of arguments, and a function that tells their types,
-- return a list showing where each argument is passed
assignArgumentsPos dflags conv arg_ty reps = assignments
where -- The calling conventions (CgCallConv.hs) are complicated, to say the least
regs = case (reps, conv) of
(_, NativeNodeCall) -> getRegsWithNode dflags
(_, NativeDirectCall) -> getRegsWithoutNode dflags
([_], NativeReturn) -> allRegs dflags
(_, NativeReturn) -> getRegsWithNode dflags
-- GC calling convention *must* put values in registers
(_, GC) -> allRegs dflags
(_, PrimOpCall) -> allRegs dflags
([_], PrimOpReturn) -> allRegs dflags
(_, PrimOpReturn) -> getRegsWithNode dflags
(_, Slow) -> noRegs
-- The calling conventions first assign arguments to registers,
-- then switch to the stack when we first run out of registers
-- (even if there are still available registers for args of a different type).
-- When returning an unboxed tuple, we also separate the stack
-- arguments by pointerhood.
(reg_assts, stk_args) = assign_regs [] reps regs
stk_args' = case conv of NativeReturn -> part
PrimOpReturn -> part
GC | length stk_args /= 0 -> panic "Failed to allocate registers for GC call"
_ -> stk_args
where part = uncurry (++)
(L.partition (not . isGcPtrType . arg_ty) stk_args)
stk_assts = assign_stk 0 [] (reverse stk_args')
assignments = reg_assts ++ stk_assts
assign_regs assts [] _ = (assts, [])
assign_regs assts (r:rs) regs = if isFloatType ty then float else int
where float = case (w, regs) of
(W32, (vs, f:fs, ds, ls)) -> k (RegisterParam f, (vs, fs, ds, ls))
(W64, (vs, fs, d:ds, ls)) -> k (RegisterParam d, (vs, fs, ds, ls))
(W80, _) -> panic "F80 unsupported register type"
_ -> (assts, (r:rs))
int = case (w, regs) of
(W128, _) -> panic "W128 unsupported register type"
(_, (v:vs, fs, ds, ls)) | widthInBits w <= widthInBits (wordWidth dflags)
-> k (RegisterParam (v gcp), (vs, fs, ds, ls))
(_, (vs, fs, ds, l:ls)) | widthInBits w > widthInBits (wordWidth dflags)
-> k (RegisterParam l, (vs, fs, ds, ls))
_ -> (assts, (r:rs))
k (asst, regs') = assign_regs ((r, asst) : assts) rs regs'
ty = arg_ty r
w = typeWidth ty
gcp | isGcPtrType ty = VGcPtr
| otherwise = VNonGcPtr
assign_stk _ assts [] = assts
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 dflags) + 1) * wORD_SIZE dflags
off' = offset + size
-----------------------------------------------------------------------------
-- Local information about the registers available
type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
, [GlobalReg] -- floats
, [GlobalReg] -- doubles
, [GlobalReg] -- longs (int64 and word64)
)
-- Vanilla registers can contain pointers, Ints, Chars.
-- Floats and doubles have separate register supplies.
--
-- We take these register supplies from the *real* registers, i.e. those
-- that are guaranteed to map to machine registers.
getRegsWithoutNode, getRegsWithNode :: DynFlags -> AvailRegs
getRegsWithoutNode dflags =
( filter (\r -> r VGcPtr /= node) (realVanillaRegs dflags)
, realFloatRegs dflags
, realDoubleRegs dflags
, realLongRegs dflags)
-- getRegsWithNode uses R1/node even if it isn't a register
getRegsWithNode dflags =
( if null (realVanillaRegs dflags)
then [VanillaReg 1]
else realVanillaRegs dflags
, realFloatRegs dflags
, realDoubleRegs dflags
, realLongRegs dflags)
allFloatRegs, allDoubleRegs, allLongRegs :: DynFlags -> [GlobalReg]
allVanillaRegs :: DynFlags -> [VGcPtr -> GlobalReg]
allVanillaRegs dflags = map VanillaReg $ regList (mAX_Vanilla_REG dflags)
allFloatRegs dflags = map FloatReg $ regList (mAX_Float_REG dflags)
allDoubleRegs dflags = map DoubleReg $ regList (mAX_Double_REG dflags)
allLongRegs dflags = map LongReg $ regList (mAX_Long_REG dflags)
realFloatRegs, realDoubleRegs, realLongRegs :: DynFlags -> [GlobalReg]
realVanillaRegs :: DynFlags -> [VGcPtr -> GlobalReg]
realVanillaRegs dflags = map VanillaReg $ regList (mAX_Real_Vanilla_REG dflags)
realFloatRegs dflags = map FloatReg $ regList (mAX_Real_Float_REG dflags)
realDoubleRegs dflags = map DoubleReg $ regList (mAX_Real_Double_REG dflags)
realLongRegs dflags = map LongReg $ regList (mAX_Real_Long_REG dflags)
regList :: Int -> [Int]
regList n = [1 .. n]
allRegs :: DynFlags -> AvailRegs
allRegs dflags = (allVanillaRegs dflags,
allFloatRegs dflags,
allDoubleRegs dflags,
allLongRegs dflags)
noRegs :: AvailRegs
noRegs = ([], [], [], [])
globalArgRegs :: DynFlags -> [GlobalReg]
globalArgRegs dflags = map ($ VGcPtr) (allVanillaRegs dflags) ++
allFloatRegs dflags ++
allDoubleRegs dflags ++
allLongRegs dflags
|
