9 #include "HsVersions.h"
13 import ZipCfgCmmRep (Convention(..))
16 import StaticFlags (opt_Unregisterised)
19 -- Calculate the 'GlobalReg' or stack locations for function call
20 -- parameters as used by the Cmm calling convention.
23 = RegisterParam GlobalReg
26 instance (Outputable a) => Outputable (ParamLocation a) where
27 ppr (RegisterParam g) = ppr g
28 ppr (StackParam p) = ppr p
30 type ArgumentFormat a b = [(a, ParamLocation b)]
32 -- Stack parameters are returned as word offsets.
33 assignArguments :: (a -> CmmType) -> [a] -> ArgumentFormat a WordOff
34 assignArguments f reps = assignments
36 availRegs = getRegsWithNode
37 (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs
38 assignArguments' [] _ _ = []
39 assignArguments' (r:rs) offset availRegs =
40 (size,(r,assignment)):assignArguments' rs new_offset remaining
42 (assignment, new_offset, size, remaining) =
43 assign_reg assign_slot_neg (f r) offset availRegs
45 -- | JD: For the new stack story, I want arguments passed on the stack to manifest as
46 -- positive offsets in a CallArea, not negative offsets from the stack pointer.
47 -- Also, I want byte offsets, not word offsets.
48 assignArgumentsPos :: (Outputable a) => Convention -> (a -> CmmType) -> [a] ->
49 ArgumentFormat a ByteOff
50 assignArgumentsPos conv arg_ty reps = map cvt assignments
51 where -- The calling conventions (CgCallConv.hs) are complicated, to say the least
52 regs = case (reps, conv) of
53 (_, NativeNodeCall) -> getRegsWithNode
54 (_, NativeDirectCall) -> getRegsWithoutNode
55 ([_], NativeReturn) -> allRegs
56 (_, NativeReturn) -> getRegsWithNode
57 (_, GC) -> getRegsWithNode
58 (_, PrimOpCall) -> allRegs
59 ([_], PrimOpReturn) -> allRegs
60 (_, PrimOpReturn) -> getRegsWithNode
62 _ -> pprPanic "Unknown calling convention" (ppr conv)
63 (sizes, assignments) = unzip $ assignArguments' reps (sum sizes) regs
64 assignArguments' [] _ _ = []
65 assignArguments' (r:rs) offset avails =
66 (size, (r,assignment)):assignArguments' rs new_offset remaining
68 (assignment, new_offset, size, remaining) =
69 assign_reg assign_slot_pos (arg_ty r) offset avails
70 cvt (l, RegisterParam r) = (l, RegisterParam r)
71 cvt (l, StackParam off) = (l, StackParam $ off * wORD_SIZE)
73 argumentsSize :: (a -> CmmType) -> [a] -> WordOff
74 argumentsSize f reps = maximum (0 : map arg_top args)
76 args = assignArguments f reps
77 arg_top (_, StackParam offset) = -offset
78 arg_top (_, RegisterParam _) = 0
80 -----------------------------------------------------------------------------
81 -- Local information about the registers available
83 type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
84 , [GlobalReg] -- floats
85 , [GlobalReg] -- doubles
86 , [GlobalReg] -- longs (int64 and word64)
89 -- Vanilla registers can contain pointers, Ints, Chars.
90 -- Floats and doubles have separate register supplies.
92 -- We take these register supplies from the *real* registers, i.e. those
93 -- that are guaranteed to map to machine registers.
95 vanillaRegNos, floatRegNos, doubleRegNos, longRegNos :: [Int]
96 vanillaRegNos | opt_Unregisterised = []
97 | otherwise = regList mAX_Real_Vanilla_REG
98 floatRegNos | opt_Unregisterised = []
99 | otherwise = regList mAX_Real_Float_REG
100 doubleRegNos | opt_Unregisterised = []
101 | otherwise = regList mAX_Real_Double_REG
102 longRegNos | opt_Unregisterised = []
103 | otherwise = regList mAX_Real_Long_REG
106 getRegsWithoutNode, getRegsWithNode :: AvailRegs
108 (filter (\r -> r VGcPtr /= node) intRegs,
109 map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
110 where intRegs = map VanillaReg vanillaRegNos
112 (intRegs, map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
113 where intRegs = map VanillaReg vanillaRegNos
115 allVanillaRegNos, allFloatRegNos, allDoubleRegNos, allLongRegNos :: [Int]
116 allVanillaRegNos = regList mAX_Vanilla_REG
117 allFloatRegNos = regList mAX_Float_REG
118 allDoubleRegNos = regList mAX_Double_REG
119 allLongRegNos = regList mAX_Long_REG
121 regList :: Int -> [Int]
125 allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos,
126 map DoubleReg allDoubleRegNos, map LongReg allLongRegNos)
129 noRegs = ([], [], [], [])
131 -- Round the size of a local register up to the nearest word.
135 slot_size :: LocalReg -> Int
136 slot_size reg = slot_size' (typeWidth (localRegType reg))
139 slot_size' :: Width -> Int
140 slot_size' reg = ((widthInBytes reg - 1) `div` wORD_SIZE) + 1
142 type Assignment = (ParamLocation WordOff, WordOff, WordOff, AvailRegs)
143 type SlotAssigner = Width -> Int -> AvailRegs -> Assignment
145 assign_reg :: SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment
146 assign_reg slot ty off avails
147 | isFloatType ty = assign_float_reg slot width off avails
148 | otherwise = assign_bits_reg slot width off gcp avails
151 gcp | isGcPtrType ty = VGcPtr
152 | otherwise = VNonGcPtr
154 -- Assigning a slot using negative offsets from the stack pointer.
155 -- JD: I don't know why this convention stops using all the registers
156 -- after running out of one class of registers.
157 assign_slot_neg :: SlotAssigner
158 assign_slot_neg width off _regs =
159 (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width
161 -- Assigning a slot using positive offsets into a CallArea.
162 assign_slot_pos :: SlotAssigner
163 assign_slot_pos width off _regs =
164 (StackParam $ off, off - size, size, ([], [], [], []))
165 where size = slot_size' width
167 -- On calls in the native convention, `node` is used to hold the environment
168 -- for the closure, so we can't pass arguments in that register.
169 assign_bits_reg :: SlotAssigner -> Width -> WordOff -> VGcPtr -> AvailRegs -> Assignment
170 assign_bits_reg _ W128 _ _ _ = panic "W128 is not a supported register type"
171 assign_bits_reg _ w off gcp (v:vs, fs, ds, ls)
172 | widthInBits w <= widthInBits wordWidth =
173 (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls))
174 assign_bits_reg _ w off _ (vs, fs, ds, l:ls)
175 | widthInBits w > widthInBits wordWidth =
176 (RegisterParam l, off, 0, (vs, fs, ds, ls))
177 assign_bits_reg assign_slot w off _ regs@(_, _, _, _) = assign_slot w off regs
179 assign_float_reg :: SlotAssigner -> Width -> WordOff -> AvailRegs -> Assignment
180 assign_float_reg _ W32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
181 assign_float_reg _ W64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
182 assign_float_reg _ W80 _ _ = panic "F80 is not a supported register type"
183 assign_float_reg assign_slot width off r = assign_slot width off r