X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FCmmCallConv.hs;h=fa619af206aa5e5f1411d9824e3d282c359aa482;hb=aedb94f5f220b5e442b23ecc445fd38c8d9b6ba0;hp=d24d77a41de532a05f12fc2ce77c67fa1457da4c;hpb=ad94d40948668032189ad22a0ad741ac1f645f50;p=ghc-hetmet.git diff --git a/compiler/cmm/CmmCallConv.hs b/compiler/cmm/CmmCallConv.hs index d24d77a..fa619af 100644 --- a/compiler/cmm/CmmCallConv.hs +++ b/compiler/cmm/CmmCallConv.hs @@ -9,51 +9,84 @@ module CmmCallConv ( ParamLocation(..), ArgumentFormat, assignArguments, + assignArgumentsPos, argumentsSize, ) where #include "HsVersions.h" import Cmm -import MachOp import SMRep +import ZipCfgCmmRep (Convention(..)) import Constants import StaticFlags (opt_Unregisterised) +import Outputable import Panic -- Calculate the 'GlobalReg' or stack locations for function call -- parameters as used by the Cmm calling convention. -data ParamLocation +data ParamLocation a = RegisterParam GlobalReg - | StackParam WordOff + | StackParam a -type ArgumentFormat a = [(a, ParamLocation)] +instance (Outputable a) => Outputable (ParamLocation a) where + ppr (RegisterParam g) = ppr g + ppr (StackParam p) = ppr p -assignArguments :: (a -> MachRep) -> [a] -> ArgumentFormat a +type ArgumentFormat a b = [(a, ParamLocation b)] + +-- Stack parameters are returned as word offsets. +assignArguments :: (a -> CmmType) -> [a] -> ArgumentFormat a WordOff assignArguments f reps = assignments where + availRegs = getRegs False (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs assignArguments' [] offset availRegs = [] assignArguments' (r:rs) offset availRegs = (size,(r,assignment)):assignArguments' rs new_offset remaining where (assignment, new_offset, size, remaining) = - assign_reg (f r) offset availRegs + assign_reg assign_slot_neg (f r) offset availRegs + +-- | 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. +-- The first argument tells us whether we are assigning positions for call arguments +-- or return results. The distinction matters because some conventions use different +-- global registers in each case. In particular, the native calling convention +-- uses the `node' register to pass the closure environment. +assignArgumentsPos :: (Outputable a) => Convention -> Bool -> (a -> CmmType) -> [a] -> + ArgumentFormat a ByteOff +assignArgumentsPos conv isCall arg_ty reps = map cvt assignments + where + regs = case conv of Native -> getRegs isCall + GC -> getRegs False + PrimOp -> noStack + Slow -> noRegs + _ -> panic "unrecognized calling convention" + (sizes, assignments) = unzip $ assignArguments' reps (sum sizes) regs + assignArguments' [] _ _ = [] + assignArguments' (r:rs) offset avails = + (size, (r,assignment)):assignArguments' rs new_offset remaining + where + (assignment, new_offset, size, remaining) = + assign_reg assign_slot_pos (arg_ty r) offset avails + cvt (l, RegisterParam r) = (l, RegisterParam r) + cvt (l, StackParam off) = (l, StackParam $ off * wORD_SIZE) -argumentsSize :: (a -> MachRep) -> [a] -> WordOff +argumentsSize :: (a -> CmmType) -> [a] -> WordOff argumentsSize f reps = maximum (0 : map arg_top args) where args = assignArguments f reps - arg_top (a, StackParam offset) = -offset arg_top (_, RegisterParam _) = 0 ----------------------------------------------------------------------------- -- Local information about the registers available -type AvailRegs = ( [GlobalReg] -- available vanilla regs. +type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs. , [GlobalReg] -- floats , [GlobalReg] -- doubles , [GlobalReg] -- longs (int64 and word64) @@ -74,27 +107,62 @@ useDoubleRegs | opt_Unregisterised = 0 useLongRegs | opt_Unregisterised = 0 | otherwise = mAX_Real_Long_REG -availRegs = (regList VanillaReg useVanillaRegs, - regList FloatReg useFloatRegs, - regList DoubleReg useDoubleRegs, - regList LongReg useLongRegs) +getRegs reserveNode = + (if reserveNode then filter (\r -> r VGcPtr /= node) intRegs else intRegs, + regList FloatReg useFloatRegs, + regList DoubleReg useDoubleRegs, + regList LongReg useLongRegs) where regList f max = map f [1 .. max] + intRegs = regList VanillaReg useVanillaRegs + +noStack = (map VanillaReg any, map FloatReg any, map DoubleReg any, map LongReg any) + where any = [1 .. ] +noRegs = ([], [], [], []) +-- Round the size of a local register up to the nearest word. slot_size :: LocalReg -> Int -slot_size reg = - ((machRepByteWidth (localRegRep reg) - 1) `div` wORD_SIZE) + 1 - -slot_size' :: MachRep -> Int -slot_size' reg = ((machRepByteWidth reg - 1) `div` wORD_SIZE) + 1 - -assign_reg :: MachRep -> WordOff -> AvailRegs -> (ParamLocation, WordOff, WordOff, AvailRegs) -assign_reg I8 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls)) -assign_reg I16 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls)) -assign_reg I32 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls)) -assign_reg I64 off (vs, fs, ds, l:ls) = (RegisterParam $ l, off, 0, (vs, fs, ds, ls)) -assign_reg I128 off _ = panic "I128 is not a supported register type" -assign_reg F32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls)) -assign_reg F64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls)) -assign_reg F80 off _ = panic "F80 is not a supported register type" -assign_reg reg off _ = (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' reg +slot_size reg = slot_size' (typeWidth (localRegType reg)) + +slot_size' :: Width -> Int +slot_size' reg = ((widthInBytes reg - 1) `div` wORD_SIZE) + 1 + +type Assignment = (ParamLocation WordOff, WordOff, WordOff, AvailRegs) +type SlotAssigner = Width -> Int -> AvailRegs -> Assignment + +assign_reg :: SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment +assign_reg slot ty off avails + | isFloatType ty = assign_float_reg slot width off avails + | otherwise = assign_bits_reg slot width off gcp avails + where + width = typeWidth ty + gcp | isGcPtrType ty = VGcPtr + | otherwise = VNonGcPtr + +-- Assigning a slot using negative offsets from the stack pointer. +-- JD: I don't know why this convention stops using all the registers +-- after running out of one class of registers. +assign_slot_neg :: SlotAssigner +assign_slot_neg width off regs = + (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width + +-- Assigning a slot using positive offsets into a CallArea. +assign_slot_pos :: SlotAssigner +assign_slot_pos width off regs = + (StackParam $ off, off - size, size, ([], [], [], [])) + where size = slot_size' width + +-- On calls in the native convention, `node` is used to hold the environment +-- for the closure, so we can't pass arguments in that register. +assign_bits_reg _ W128 _ _ _ = panic "W128 is not a supported register type" +assign_bits_reg assign_slot w off gcp regs@(v:vs, fs, ds, ls) = + if widthInBits w <= widthInBits wordWidth then + (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls)) + else assign_slot w off regs +assign_bits_reg assign_slot w off gcp regs@([], _, _, _) = + assign_slot w off regs + +assign_float_reg _ W32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls)) +assign_float_reg _ W64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls)) +assign_float_reg _ W80 off _ = panic "F80 is not a supported register type" +assign_float_reg assign_slot width off r = assign_slot width off r