9 #include "HsVersions.h"
13 import ZipCfgCmmRep (Convention(..))
16 import StaticFlags (opt_Unregisterised)
20 -- Calculate the 'GlobalReg' or stack locations for function call
21 -- parameters as used by the Cmm calling convention.
24 = RegisterParam GlobalReg
27 instance (Outputable a) => Outputable (ParamLocation a) where
28 ppr (RegisterParam g) = ppr g
29 ppr (StackParam p) = ppr p
31 type ArgumentFormat a b = [(a, ParamLocation b)]
33 -- Stack parameters are returned as word offsets.
34 assignArguments :: (a -> CmmType) -> [a] -> ArgumentFormat a WordOff
35 assignArguments f reps = assignments
37 availRegs = getRegsWithNode
38 (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs
39 assignArguments' [] _ _ = []
40 assignArguments' (r:rs) offset availRegs =
41 (size,(r,assignment)):assignArguments' rs new_offset remaining
43 (assignment, new_offset, size, remaining) =
44 assign_reg assign_slot_neg (f r) offset availRegs
46 -- | JD: For the new stack story, I want arguments passed on the stack to manifest as
47 -- positive offsets in a CallArea, not negative offsets from the stack pointer.
48 -- Also, I want byte offsets, not word offsets.
49 -- The first argument tells us whether we are assigning positions for call arguments
50 -- or return results. The distinction matters because some conventions use different
51 -- global registers in each case. In particular, the native calling convention
52 -- uses the `node' register to pass the closure environment.
53 assignArgumentsPos :: (Outputable a) => Convention -> Bool -> (a -> CmmType) -> [a] ->
54 ArgumentFormat a ByteOff
55 assignArgumentsPos conv isCall arg_ty reps = map cvt assignments
56 where -- The calling conventions (CgCallConv.hs) are complicated, to say the least
59 (_, Native) -> getRegsWithoutNode
60 (_, GC ) -> getRegsWithNode
61 (_, PrimOp) -> allRegs
63 (_, _ ) -> getRegsWithoutNode
67 (_, Native) -> getRegsWithNode
68 (_, GC ) -> getRegsWithNode
69 (_, PrimOp) -> getRegsWithNode
71 (_, _ ) -> getRegsWithNode
72 (sizes, assignments) = unzip $ assignArguments' reps (sum sizes) regs
73 assignArguments' [] _ _ = []
74 assignArguments' (r:rs) offset avails =
75 (size, (r,assignment)):assignArguments' rs new_offset remaining
77 (assignment, new_offset, size, remaining) =
78 assign_reg assign_slot_pos (arg_ty r) offset avails
79 cvt (l, RegisterParam r) = (l, RegisterParam r)
80 cvt (l, StackParam off) = (l, StackParam $ off * wORD_SIZE)
82 argumentsSize :: (a -> CmmType) -> [a] -> WordOff
83 argumentsSize f reps = maximum (0 : map arg_top args)
85 args = assignArguments f reps
86 arg_top (_, StackParam offset) = -offset
87 arg_top (_, RegisterParam _) = 0
89 -----------------------------------------------------------------------------
90 -- Local information about the registers available
92 type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
93 , [GlobalReg] -- floats
94 , [GlobalReg] -- doubles
95 , [GlobalReg] -- longs (int64 and word64)
98 -- Vanilla registers can contain pointers, Ints, Chars.
99 -- Floats and doubles have separate register supplies.
101 -- We take these register supplies from the *real* registers, i.e. those
102 -- that are guaranteed to map to machine registers.
104 vanillaRegNos, floatRegNos, doubleRegNos, longRegNos :: [Int]
105 vanillaRegNos | opt_Unregisterised = []
106 | otherwise = regList mAX_Real_Vanilla_REG
107 floatRegNos | opt_Unregisterised = []
108 | otherwise = regList mAX_Real_Float_REG
109 doubleRegNos | opt_Unregisterised = []
110 | otherwise = regList mAX_Real_Double_REG
111 longRegNos | opt_Unregisterised = []
112 | otherwise = regList mAX_Real_Long_REG
115 getRegsWithoutNode, getRegsWithNode :: AvailRegs
117 (filter (\r -> r VGcPtr /= node) intRegs,
118 map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
119 where intRegs = map VanillaReg vanillaRegNos
121 (intRegs, map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
122 where intRegs = map VanillaReg vanillaRegNos
124 allVanillaRegNos, allFloatRegNos, allDoubleRegNos, allLongRegNos :: [Int]
125 allVanillaRegNos = regList mAX_Vanilla_REG
126 allFloatRegNos = regList mAX_Float_REG
127 allDoubleRegNos = regList mAX_Double_REG
128 allLongRegNos = regList mAX_Long_REG
130 regList :: Int -> [Int]
134 allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos,
135 map DoubleReg allDoubleRegNos, map LongReg allLongRegNos)
138 noRegs = ([], [], [], [])
140 -- Round the size of a local register up to the nearest word.
144 slot_size :: LocalReg -> Int
145 slot_size reg = slot_size' (typeWidth (localRegType reg))
148 slot_size' :: Width -> Int
149 slot_size' reg = ((widthInBytes reg - 1) `div` wORD_SIZE) + 1
151 type Assignment = (ParamLocation WordOff, WordOff, WordOff, AvailRegs)
152 type SlotAssigner = Width -> Int -> AvailRegs -> Assignment
154 assign_reg :: SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment
155 assign_reg slot ty off avails
156 | isFloatType ty = assign_float_reg slot width off avails
157 | otherwise = assign_bits_reg slot width off gcp avails
160 gcp | isGcPtrType ty = VGcPtr
161 | otherwise = VNonGcPtr
163 -- Assigning a slot using negative offsets from the stack pointer.
164 -- JD: I don't know why this convention stops using all the registers
165 -- after running out of one class of registers.
166 assign_slot_neg :: SlotAssigner
167 assign_slot_neg width off _regs =
168 (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width
170 -- Assigning a slot using positive offsets into a CallArea.
171 assign_slot_pos :: SlotAssigner
172 assign_slot_pos width off _regs =
173 (StackParam $ off, off - size, size, ([], [], [], []))
174 where size = slot_size' width
176 -- On calls in the native convention, `node` is used to hold the environment
177 -- for the closure, so we can't pass arguments in that register.
178 assign_bits_reg :: SlotAssigner -> Width -> WordOff -> VGcPtr -> AvailRegs -> Assignment
179 assign_bits_reg _ W128 _ _ _ = panic "W128 is not a supported register type"
180 assign_bits_reg _ w off gcp (v:vs, fs, ds, ls)
181 | widthInBits w <= widthInBits wordWidth =
182 pprTrace "long regs" (ppr ls <+> ppr wordWidth <+> ppr mAX_Real_Long_REG) $ (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls))
183 assign_bits_reg _ w off _ (vs, fs, ds, l:ls)
184 | widthInBits w > widthInBits wordWidth =
185 pprTrace "long regs" (ppr ls <+> ppr wordWidth <+> ppr mAX_Real_Long_REG) $ (RegisterParam l, off, 0, (vs, fs, ds, ls))
186 assign_bits_reg assign_slot w off _ regs@(_, _, _, ls) =
187 pprTrace "long regs" (ppr w <+> ppr ls <+> ppr wordWidth <+> ppr mAX_Real_Long_REG <+> ppr mAX_Long_REG) $ assign_slot w off regs
189 assign_float_reg :: SlotAssigner -> Width -> WordOff -> AvailRegs -> Assignment
190 assign_float_reg _ W32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
191 assign_float_reg _ W64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
192 assign_float_reg _ W80 _ _ = panic "F80 is not a supported register type"
193 assign_float_reg assign_slot width off r = assign_slot width off r