module CmmCallConv (
ParamLocation(..),
ArgumentFormat,
- assignRegs,
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
-data ParamLocation
+-- Calculate the 'GlobalReg' or stack locations for function call
+-- parameters as used by the Cmm calling convention.
+
+data ParamLocation a
= RegisterParam GlobalReg
- | StackParam WordOff
+ | StackParam a
+
+instance (Outputable a) => Outputable (ParamLocation a) where
+ ppr (RegisterParam g) = ppr g
+ ppr (StackParam p) = ppr p
-assignRegs :: [LocalReg] -> ArgumentFormat LocalReg
-assignRegs regs = assignRegs' regs 0 availRegs
+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
- assignRegs' (r:rs) offset availRegs = (r,assignment):assignRegs' rs new_offset remaining
+ availRegs = getRegs False
+ (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, remaining) = assign_reg (localRegRep r) offset availRegs
+ (assignment, new_offset, size, remaining) =
+ assign_reg assign_slot_neg (f r) offset availRegs
-assignArguments :: (a -> MachRep) -> [a] -> ArgumentFormat a
-assignArguments f reps = assignArguments' reps 0 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
- assignArguments' [] offset availRegs = []
- assignArguments' (r:rs) offset availRegs = (r,assignment):assignArguments' rs new_offset remaining
+ 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, remaining) = assign_reg (f r) offset availRegs
+ (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 -> CmmType) -> [a] -> WordOff
+argumentsSize f reps = maximum (0 : map arg_top args)
+ where
+ args = assignArguments f reps
+ arg_top (_, StackParam offset) = -offset
+ arg_top (_, RegisterParam _) = 0
-type ArgumentFormat a = [(a, ParamLocation)]
+-----------------------------------------------------------------------------
+-- 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)
-- We take these register supplies from the *real* registers, i.e. those
-- that are guaranteed to map to machine registers.
+useVanillaRegs, useFloatRegs, useDoubleRegs, useLongRegs :: Int
useVanillaRegs | opt_Unregisterised = 0
| otherwise = mAX_Real_Vanilla_REG
useFloatRegs | 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 :: Bool -> AvailRegs
+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 :: AvailRegs
+noStack = (map VanillaReg any, map FloatReg any, map DoubleReg any, map LongReg any)
+ where any = [1 .. ]
+
+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 = ((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, AvailRegs)
-assign_reg I8 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, (vs, fs, ds, ls))
-assign_reg I16 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, (vs, fs, ds, ls))
-assign_reg I32 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, (vs, fs, ds, ls))
-assign_reg I64 off (vs, fs, ds, l:ls) = (RegisterParam $ l, off, (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, (vs, fs, ds, ls))
-assign_reg F64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, (vs, fs, ds, ls))
-assign_reg F80 off _ = panic "F80 is not a supported register type"
-assign_reg reg off _ = (StackParam $ off - size, off - 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 :: SlotAssigner -> Width -> WordOff -> VGcPtr -> AvailRegs
+ -> Assignment
+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 _ regs@([], _, _, _) =
+ 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