-{-# 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 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.
assignArguments :: (a -> CmmType) -> [a] -> ArgumentFormat a WordOff
assignArguments f reps = assignments
where
- availRegs = getRegs False
+ availRegs = getRegsWithNode
(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
-- | 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] ->
+assignArgumentsPos :: (Outputable a) => Convention -> (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"
+assignArgumentsPos conv arg_ty reps = map cvt 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
+ (_, 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 =
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 | opt_Unregisterised = 0
- | otherwise = mAX_Real_Vanilla_REG
-useFloatRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Float_REG
-useDoubleRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Double_REG
-useLongRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Long_REG
-
-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 .. ]
+vanillaRegNos, floatRegNos, doubleRegNos, longRegNos :: [Int]
+vanillaRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Vanilla_REG
+floatRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Float_REG
+doubleRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Double_REG
+longRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Long_REG
+
+--
+getRegsWithoutNode, getRegsWithNode :: AvailRegs
+getRegsWithoutNode =
+ (filter (\r -> r VGcPtr /= node) intRegs,
+ map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
+ where intRegs = map VanillaReg vanillaRegNos
+getRegsWithNode =
+ (intRegs, map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
+ where intRegs = map VanillaReg vanillaRegNos
+
+allVanillaRegNos, allFloatRegNos, allDoubleRegNos, allLongRegNos :: [Int]
+allVanillaRegNos = regList mAX_Vanilla_REG
+allFloatRegNos = regList mAX_Float_REG
+allDoubleRegNos = regList mAX_Double_REG
+allLongRegNos = regList mAX_Long_REG
+
+regList :: Int -> [Int]
+regList n = [1 .. n]
+
+allRegs :: AvailRegs
+allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos,
+ map DoubleReg allDoubleRegNos, map LongReg allLongRegNos)
+
+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
-- 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 =
+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 =
+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 gcp regs@([], _, _, _) =
- assign_slot w off regs
-
+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@(_, _, _, _) = 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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