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
57 regs = case (reps, conv) of
58 (_, NativeNodeCall) -> getRegsWithNode
59 (_, NativeDirectCall) -> getRegsWithoutNode
60 ([_], NativeReturn) -> allRegs
61 (_, NativeReturn) -> getRegsWithNode
62 (_, GC) -> getRegsWithNode
63 (_, PrimOpCall) -> allRegs
64 ([_], PrimOpReturn) -> allRegs
65 (_, PrimOpReturn) -> getRegsWithNode
67 _ -> pprPanic "Unknown calling convention" (ppr conv)
68 -- regs = if isCall then
69 -- case (reps, conv) of
70 -- (_, NativeNodeCall) -> getRegsWithNode
71 -- (_, NativeDirectCall) -> getRegsWithoutNode
72 -- (_, GC ) -> getRegsWithNode
73 -- (_, PrimOpCall) -> allRegs
74 -- (_, Slow ) -> noRegs
75 -- _ -> pprPanic "Unknown calling convention" (ppr conv)
77 -- case (reps, conv) of
78 -- (_, NativeNodeCall) -> getRegsWithNode
79 -- (_, NativeDirectCall) -> getRegsWithoutNode
80 -- ([_], NativeReturn) -> allRegs
81 -- (_, NativeReturn) -> getRegsWithNode
82 -- (_, GC) -> getRegsWithNode
83 -- ([_], PrimOpReturn) -> allRegs
84 -- (_, PrimOpReturn) -> getRegsWithNode
85 -- (_, Slow) -> noRegs
86 -- _ -> pprPanic "Unknown calling convention" (ppr conv)
87 -- (_, NativeCall) -> getRegsWithoutNode
88 -- (_, GC ) -> getRegsWithNode
89 -- (_, PrimOpCall) -> allRegs
90 -- (_, Slow ) -> noRegs
91 -- _ -> panic "Unknown calling convention"
93 -- case (reps, conv) of
94 -- ([_], _) -> allRegs
95 -- (_, NativeCall) -> getRegsWithNode
96 (sizes, assignments) = unzip $ assignArguments' reps (sum sizes) regs
97 assignArguments' [] _ _ = []
98 assignArguments' (r:rs) offset avails =
99 (size, (r,assignment)):assignArguments' rs new_offset remaining
101 (assignment, new_offset, size, remaining) =
102 assign_reg assign_slot_pos (arg_ty r) offset avails
103 cvt (l, RegisterParam r) = (l, RegisterParam r)
104 cvt (l, StackParam off) = (l, StackParam $ off * wORD_SIZE)
106 argumentsSize :: (a -> CmmType) -> [a] -> WordOff
107 argumentsSize f reps = maximum (0 : map arg_top args)
109 args = assignArguments f reps
110 arg_top (_, StackParam offset) = -offset
111 arg_top (_, RegisterParam _) = 0
113 -----------------------------------------------------------------------------
114 -- Local information about the registers available
116 type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
117 , [GlobalReg] -- floats
118 , [GlobalReg] -- doubles
119 , [GlobalReg] -- longs (int64 and word64)
122 -- Vanilla registers can contain pointers, Ints, Chars.
123 -- Floats and doubles have separate register supplies.
125 -- We take these register supplies from the *real* registers, i.e. those
126 -- that are guaranteed to map to machine registers.
128 vanillaRegNos, floatRegNos, doubleRegNos, longRegNos :: [Int]
129 vanillaRegNos | opt_Unregisterised = []
130 | otherwise = regList mAX_Real_Vanilla_REG
131 floatRegNos | opt_Unregisterised = []
132 | otherwise = regList mAX_Real_Float_REG
133 doubleRegNos | opt_Unregisterised = []
134 | otherwise = regList mAX_Real_Double_REG
135 longRegNos | opt_Unregisterised = []
136 | otherwise = regList mAX_Real_Long_REG
139 getRegsWithoutNode, getRegsWithNode :: AvailRegs
141 (filter (\r -> r VGcPtr /= node) intRegs,
142 map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
143 where intRegs = map VanillaReg vanillaRegNos
145 (intRegs, map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
146 where intRegs = map VanillaReg vanillaRegNos
148 allVanillaRegNos, allFloatRegNos, allDoubleRegNos, allLongRegNos :: [Int]
149 allVanillaRegNos = regList mAX_Vanilla_REG
150 allFloatRegNos = regList mAX_Float_REG
151 allDoubleRegNos = regList mAX_Double_REG
152 allLongRegNos = regList mAX_Long_REG
154 regList :: Int -> [Int]
158 allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos,
159 map DoubleReg allDoubleRegNos, map LongReg allLongRegNos)
162 noRegs = ([], [], [], [])
164 -- Round the size of a local register up to the nearest word.
168 slot_size :: LocalReg -> Int
169 slot_size reg = slot_size' (typeWidth (localRegType reg))
172 slot_size' :: Width -> Int
173 slot_size' reg = ((widthInBytes reg - 1) `div` wORD_SIZE) + 1
175 type Assignment = (ParamLocation WordOff, WordOff, WordOff, AvailRegs)
176 type SlotAssigner = Width -> Int -> AvailRegs -> Assignment
178 assign_reg :: SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment
179 assign_reg slot ty off avails
180 | isFloatType ty = assign_float_reg slot width off avails
181 | otherwise = assign_bits_reg slot width off gcp avails
184 gcp | isGcPtrType ty = VGcPtr
185 | otherwise = VNonGcPtr
187 -- Assigning a slot using negative offsets from the stack pointer.
188 -- JD: I don't know why this convention stops using all the registers
189 -- after running out of one class of registers.
190 assign_slot_neg :: SlotAssigner
191 assign_slot_neg width off _regs =
192 (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width
194 -- Assigning a slot using positive offsets into a CallArea.
195 assign_slot_pos :: SlotAssigner
196 assign_slot_pos width off _regs =
197 (StackParam $ off, off - size, size, ([], [], [], []))
198 where size = slot_size' width
200 -- On calls in the native convention, `node` is used to hold the environment
201 -- for the closure, so we can't pass arguments in that register.
202 assign_bits_reg :: SlotAssigner -> Width -> WordOff -> VGcPtr -> AvailRegs -> Assignment
203 assign_bits_reg _ W128 _ _ _ = panic "W128 is not a supported register type"
204 assign_bits_reg _ w off gcp (v:vs, fs, ds, ls)
205 | widthInBits w <= widthInBits wordWidth =
206 pprTrace "long regs" (ppr ls <+> ppr wordWidth <+> ppr mAX_Real_Long_REG) $ (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls))
207 assign_bits_reg _ w off _ (vs, fs, ds, l:ls)
208 | widthInBits w > widthInBits wordWidth =
209 pprTrace "long regs" (ppr ls <+> ppr wordWidth <+> ppr mAX_Real_Long_REG) $ (RegisterParam l, off, 0, (vs, fs, ds, ls))
210 assign_bits_reg assign_slot w off _ regs@(_, _, _, ls) =
211 pprTrace "long regs" (ppr w <+> ppr ls <+> ppr wordWidth <+> ppr mAX_Real_Long_REG <+> ppr mAX_Long_REG) $ assign_slot w off regs
213 assign_float_reg :: SlotAssigner -> Width -> WordOff -> AvailRegs -> Assignment
214 assign_float_reg _ W32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
215 assign_float_reg _ W64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
216 assign_float_reg _ W80 _ _ = panic "F80 is not a supported register type"
217 assign_float_reg assign_slot width off r = assign_slot width off r