X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FCmmCallConv.hs;h=5476eb8fa2c0ab660bf1198042489dd9525b8d0f;hp=d24d77a41de532a05f12fc2ce77c67fa1457da4c;hb=176fa33f17dd78355cc572e006d2ab26898e2c69;hpb=e06951a75a1f519e8f015880c363a8dedc08ff9c diff --git a/compiler/cmm/CmmCallConv.hs b/compiler/cmm/CmmCallConv.hs index d24d77a..5476eb8 100644 --- a/compiler/cmm/CmmCallConv.hs +++ b/compiler/cmm/CmmCallConv.hs @@ -9,29 +9,31 @@ module CmmCallConv ( ParamLocation(..), ArgumentFormat, assignArguments, + assignArgumentsPos, argumentsSize, ) where #include "HsVersions.h" import Cmm -import MachOp import SMRep 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)] +type ArgumentFormat a b = [(a, ParamLocation b)] -assignArguments :: (a -> MachRep) -> [a] -> ArgumentFormat a +-- Stack parameters are returned as word offsets. +assignArguments :: (a -> CmmType) -> [a] -> ArgumentFormat a WordOff assignArguments f reps = assignments where (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs @@ -40,20 +42,38 @@ assignArguments f reps = assignments (size,(r,assignment)):assignArguments' rs new_offset remaining where (assignment, new_offset, size, remaining) = - assign_reg (f r) offset availRegs + assign_reg False assign_slot_up (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 we reserve different +-- global registers in each case. +assignArgumentsPos :: Bool -> (a -> CmmType) -> [a] -> ArgumentFormat a ByteOff +assignArgumentsPos isCall arg_ty reps = map cvt assignments + where + (sizes, assignments) = unzip $ assignArguments' reps 0 availRegs + assignArguments' [] _ _ = [] + assignArguments' (r:rs) offset avails = + (size,(r,assignment)):assignArguments' rs new_offset remaining + where + (assignment, new_offset, size, remaining) = + assign_reg isCall assign_slot_down (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) @@ -81,20 +101,49 @@ availRegs = (regList VanillaReg useVanillaRegs, where regList f max = map f [1 .. max] +-- 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 :: Bool -> SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment +assign_reg isCall slot ty off avails + | isFloatType ty = assign_float_reg slot width off avails + | otherwise = assign_bits_reg isCall slot width off gcp avails + where + width = typeWidth ty + gcp | isGcPtrType ty = VGcPtr + | otherwise = VNonGcPtr + +-- Assigning a slot on a stack that grows up: +-- JD: I don't know why this convention stops using all the registers +-- after running out of one class of registers. +assign_slot_up :: SlotAssigner +assign_slot_up width off regs = + (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width + +-- Assigning a slot on a stack that grows down: +assign_slot_down :: SlotAssigner +assign_slot_down width off regs = + (StackParam $ off + size, off + size, size, ([], [], [], [])) + where size = slot_size' width + +-- On calls, `node` is used to hold the closure that is entered, so we can't +-- pass arguments in that register. +assign_bits_reg _ _ W128 _ _ _ = panic "I128 is not a supported register type" +assign_bits_reg isCall assign_slot w off gcp regs@(v:vs, fs, ds, ls) = + if isCall && v gcp == node then + assign_bits_reg isCall assign_slot w off gcp (vs, fs, ds, ls) + else if widthInBits w <= widthInBits wordWidth then + (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls)) + else 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