X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FCmmCallConv.hs;h=830c87911297d68f8cf0a8165c89515508569eff;hp=b9df541ee4f80969af3203201ac2608dadcb4c30;hb=d25676a6b1c42495702048b6ca6f26ebd15205d8;hpb=a8e1e190ee5aa16f31bdde26daf3c897314e8994 diff --git a/compiler/cmm/CmmCallConv.hs b/compiler/cmm/CmmCallConv.hs index b9df541..830c879 100644 --- a/compiler/cmm/CmmCallConv.hs +++ b/compiler/cmm/CmmCallConv.hs @@ -8,14 +8,15 @@ module CmmCallConv ( #include "HsVersions.h" -import Cmm +import CmmExpr import SMRep -import ZipCfgCmmRep (Convention(..)) +import Cmm (Convention(..)) +import PprCmm () import Constants +import qualified Data.List as L 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. @@ -30,47 +31,73 @@ instance (Outputable a) => Outputable (ParamLocation a) where 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 = getRegsWithNode - (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs - assignArguments' [] _ _ = [] - assignArguments' (r:rs) offset availRegs = - (size,(r,assignment)):assignArguments' rs new_offset remaining - where - (assignment, new_offset, size, remaining) = - assign_reg assign_slot_neg (f r) offset availRegs +-- Stack parameters are returned as word offsets. +assignArguments _ _ = panic "assignArguments only used in dead codegen" -- assignments -- | 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 :: (Outputable a) => Convention -> (a -> CmmType) -> [a] -> ArgumentFormat a ByteOff -assignArgumentsPos conv arg_ty reps = map cvt assignments +-- Given a list of arguments, and a function that tells their types, +-- return a list showing where each argument is passed +assignArgumentsPos conv arg_ty reps = assignments where -- The calling conventions (CgCallConv.hs) are complicated, to say the least regs = case (reps, conv) of (_, NativeNodeCall) -> getRegsWithNode (_, NativeDirectCall) -> getRegsWithoutNode ([_], NativeReturn) -> allRegs (_, NativeReturn) -> getRegsWithNode - (_, GC) -> getRegsWithNode + -- GC calling convention *must* put values in registers + (_, GC) -> allRegs (_, PrimOpCall) -> allRegs ([_], PrimOpReturn) -> allRegs (_, PrimOpReturn) -> getRegsWithNode (_, Slow) -> noRegs _ -> pprPanic "Unknown calling convention" (ppr conv) - (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) - + -- 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 + -> k (RegisterParam (v gcp), (vs, fs, ds, ls)) + (_, (vs, fs, ds, l:ls)) | widthInBits w > widthInBits wordWidth + -> 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) + 1) * wORD_SIZE + off' = offset + size + + argumentsSize :: (a -> CmmType) -> [a] -> WordOff argumentsSize f reps = maximum (0 : map arg_top args) where @@ -82,10 +109,10 @@ argumentsSize f reps = maximum (0 : map arg_top args) -- Local information about the registers available type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs. - , [GlobalReg] -- floats - , [GlobalReg] -- doubles - , [GlobalReg] -- longs (int64 and word64) - ) + , [GlobalReg] -- floats + , [GlobalReg] -- doubles + , [GlobalReg] -- longs (int64 and word64) + ) -- Vanilla registers can contain pointers, Ints, Chars. -- Floats and doubles have separate register supplies. @@ -128,57 +155,3 @@ allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos, noRegs :: AvailRegs noRegs = ([], [], [], []) - --- Round the size of a local register up to the nearest word. -{- -UNUSED 2008-12-29 - -slot_size :: LocalReg -> Int -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 :: SlotAssigner -> Width -> WordOff -> VGcPtr -> AvailRegs -> Assignment -assign_bits_reg _ W128 _ _ _ = panic "W128 is not a supported register type" -assign_bits_reg _ w off gcp (v:vs, fs, ds, ls) - | widthInBits w <= widthInBits wordWidth = - (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls)) -assign_bits_reg _ w off _ (vs, fs, ds, l:ls) - | widthInBits w > widthInBits wordWidth = - (RegisterParam l, off, 0, (vs, fs, ds, ls)) -assign_bits_reg assign_slot w off _ regs@(_, _, _, ls) = assign_slot w off regs - -assign_float_reg :: SlotAssigner -> Width -> WordOff -> AvailRegs -> Assignment -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 _ _ = panic "F80 is not a supported register type" -assign_float_reg assign_slot width off r = assign_slot width off r