-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/CodingStyle#Warnings
--- for details
-
module CmmCallConv (
ParamLocation(..),
ArgumentFormat,
import Cmm
import SMRep
+import ZipCfgCmmRep (Convention(..))
import Constants
import StaticFlags (opt_Unregisterised)
= RegisterParam GlobalReg
| StackParam a
+instance (Outputable a) => Outputable (ParamLocation a) where
+ ppr (RegisterParam g) = ppr g
+ ppr (StackParam p) = ppr p
+
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' [] _ _ = []
assignArguments' (r:rs) offset availRegs =
(size,(r,assignment)):assignArguments' rs new_offset remaining
where
(assignment, new_offset, size, remaining) =
- assign_reg False assign_slot_up (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 we reserve different
--- global registers in each case.
-assignArgumentsPos :: Bool -> (a -> CmmType) -> [a] -> ArgumentFormat a ByteOff
-assignArgumentsPos isCall arg_ty reps = map cvt assignments
+-- 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
- (sizes, assignments) = unzip $ assignArguments' reps 0 availRegs
+ 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
+ (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
+ 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 f reps = maximum (0 : map arg_top args)
where
args = assignArguments f reps
- arg_top (a, StackParam offset) = -offset
+ arg_top (_, StackParam offset) = -offset
arg_top (_, RegisterParam _) = 0
-----------------------------------------------------------------------------
-- 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 = 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
+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 on a stack that grows up:
+-- 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_up :: SlotAssigner
-assign_slot_up width off regs =
+assign_slot_neg :: SlotAssigner
+assign_slot_neg 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, ([], [], [], []))
+-- 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, `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
+-- 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 off _ = panic "F80 is not a supported register type"
+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
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