9 #include "HsVersions.h"
13 import ZipCfgCmmRep (Convention(..))
16 import qualified Data.List as L
17 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 = panic "assignArguments only used in dead codegen" -- 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 assignArgumentsPos :: (Outputable a) => Convention -> (a -> CmmType) -> [a] ->
50 ArgumentFormat a ByteOff
51 assignArgumentsPos conv arg_ty reps = assignments -- old_assts'
52 where -- The calling conventions (CgCallConv.hs) are complicated, to say the least
53 regs = case (reps, conv) of
54 (_, NativeNodeCall) -> getRegsWithNode
55 (_, NativeDirectCall) -> getRegsWithoutNode
56 ([_], NativeReturn) -> allRegs
57 (_, NativeReturn) -> getRegsWithNode
58 (_, GC) -> getRegsWithNode
59 (_, PrimOpCall) -> allRegs
60 ([_], PrimOpReturn) -> allRegs
61 (_, PrimOpReturn) -> getRegsWithNode
63 _ -> pprPanic "Unknown calling convention" (ppr conv)
64 -- The calling conventions first assign arguments to registers,
65 -- then switch to the stack when we first run out of registers
66 -- (even if there are still available registers for args of a
68 -- When returning an unboxed tuple, we also separate the stack
69 -- arguments by pointerhood.
70 (reg_assts, stk_args) = assign_regs [] reps regs
71 stk_args' = case conv of NativeReturn -> part
74 where part = uncurry (++)
75 (L.partition (not . isGcPtrType . arg_ty) stk_args)
76 stk_assts = assign_stk 0 [] (reverse stk_args')
77 assignments = reg_assts ++ stk_assts
79 assign_regs assts [] _ = (assts, [])
80 assign_regs assts (r:rs) regs = if isFloatType ty then float else int
81 where float = case (w, regs) of
82 (W32, (vs, f:fs, ds, ls)) -> k (RegisterParam f, (vs, fs, ds, ls))
83 (W64, (vs, fs, d:ds, ls)) -> k (RegisterParam d, (vs, fs, ds, ls))
84 (W80, _) -> panic "F80 unsupported register type"
86 int = case (w, regs) of
87 (W128, _) -> panic "W128 unsupported register type"
88 (_, (v:vs, fs, ds, ls)) | widthInBits w <= widthInBits wordWidth
89 -> k (RegisterParam (v gcp), (vs, fs, ds, ls))
90 (_, (vs, fs, ds, l:ls)) | widthInBits w > widthInBits wordWidth
91 -> k (RegisterParam l, (vs, fs, ds, ls))
93 k (asst, regs') = assign_regs ((r, asst) : assts) rs regs'
96 gcp | isGcPtrType ty = VGcPtr
97 | otherwise = VNonGcPtr
99 assign_stk offset assts [] = assts
100 assign_stk offset assts (r:rs) = assign_stk off' ((r, StackParam off') : assts) rs
101 where w = typeWidth (arg_ty r)
102 size = (((widthInBytes w - 1) `div` wORD_SIZE) + 1) * wORD_SIZE
107 (old_sizes, old_assignments) = unzip $ assignArguments' reps (sum old_sizes) regs
108 old_assts' = map cvt old_assignments
110 assignArguments' [] _ _ = []
111 assignArguments' (r:rs) offset avails =
112 (size, (r,assignment)):assignArguments' rs new_offset remaining
114 (assignment, new_offset, size, remaining) =
115 assign_reg assign_slot_pos (arg_ty r) offset avails
116 cvt (l, RegisterParam r) = (l, RegisterParam r)
117 cvt (l, StackParam off) = (l, StackParam $ off * wORD_SIZE)
119 argumentsSize :: (a -> CmmType) -> [a] -> WordOff
120 argumentsSize f reps = maximum (0 : map arg_top args)
122 args = assignArguments f reps
123 arg_top (_, StackParam offset) = -offset
124 arg_top (_, RegisterParam _) = 0
126 -----------------------------------------------------------------------------
127 -- Local information about the registers available
129 type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
130 , [GlobalReg] -- floats
131 , [GlobalReg] -- doubles
132 , [GlobalReg] -- longs (int64 and word64)
135 -- Vanilla registers can contain pointers, Ints, Chars.
136 -- Floats and doubles have separate register supplies.
138 -- We take these register supplies from the *real* registers, i.e. those
139 -- that are guaranteed to map to machine registers.
141 vanillaRegNos, floatRegNos, doubleRegNos, longRegNos :: [Int]
142 vanillaRegNos | opt_Unregisterised = []
143 | otherwise = regList mAX_Real_Vanilla_REG
144 floatRegNos | opt_Unregisterised = []
145 | otherwise = regList mAX_Real_Float_REG
146 doubleRegNos | opt_Unregisterised = []
147 | otherwise = regList mAX_Real_Double_REG
148 longRegNos | opt_Unregisterised = []
149 | otherwise = regList mAX_Real_Long_REG
152 getRegsWithoutNode, getRegsWithNode :: AvailRegs
154 (filter (\r -> r VGcPtr /= node) intRegs,
155 map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
156 where intRegs = map VanillaReg vanillaRegNos
158 (intRegs, map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
159 where intRegs = map VanillaReg vanillaRegNos
161 allVanillaRegNos, allFloatRegNos, allDoubleRegNos, allLongRegNos :: [Int]
162 allVanillaRegNos = regList mAX_Vanilla_REG
163 allFloatRegNos = regList mAX_Float_REG
164 allDoubleRegNos = regList mAX_Double_REG
165 allLongRegNos = regList mAX_Long_REG
167 regList :: Int -> [Int]
171 allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos,
172 map DoubleReg allDoubleRegNos, map LongReg allLongRegNos)
175 noRegs = ([], [], [], [])
177 -- Round the size of a local register up to the nearest word.
181 slot_size :: LocalReg -> Int
182 slot_size reg = slot_size' (typeWidth (localRegType reg))
185 slot_size' :: Width -> Int
186 slot_size' reg = ((widthInBytes reg - 1) `div` wORD_SIZE) + 1
188 type Assignment = (ParamLocation WordOff, WordOff, WordOff, AvailRegs)
189 type SlotAssigner = Width -> Int -> AvailRegs -> Assignment
191 assign_reg :: SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment
192 assign_reg slot ty off avails
193 | isFloatType ty = assign_float_reg slot width off avails
194 | otherwise = assign_bits_reg slot width off gcp avails
197 gcp | isGcPtrType ty = VGcPtr
198 | otherwise = VNonGcPtr
200 -- Assigning a slot using negative offsets from the stack pointer.
201 -- JD: I don't know why this convention stops using all the registers
202 -- after running out of one class of registers, but that's how it is.
203 assign_slot_neg :: SlotAssigner
204 assign_slot_neg width off _regs =
205 (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width
207 -- Assigning a slot using positive offsets into a CallArea.
208 assign_slot_pos :: SlotAssigner
209 assign_slot_pos width off _regs =
210 (StackParam $ off, off - size, size, ([], [], [], []))
211 where size = slot_size' width
213 -- On calls in the native convention, `node` is used to hold the environment
214 -- for the closure, so we can't pass arguments in that register.
215 assign_bits_reg :: SlotAssigner -> Width -> WordOff -> VGcPtr -> AvailRegs -> Assignment
216 assign_bits_reg _ W128 _ _ _ = panic "W128 is not a supported register type"
217 assign_bits_reg _ w off gcp (v:vs, fs, ds, ls)
218 | widthInBits w <= widthInBits wordWidth =
219 (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls))
220 assign_bits_reg _ w off _ (vs, fs, ds, l:ls)
221 | widthInBits w > widthInBits wordWidth =
222 (RegisterParam l, off, 0, (vs, fs, ds, ls))
223 assign_bits_reg assign_slot w off _ regs@(_, _, _, _) = assign_slot w off regs
225 assign_float_reg :: SlotAssigner -> Width -> WordOff -> AvailRegs -> Assignment
226 assign_float_reg _ W32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
227 assign_float_reg _ W64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
228 assign_float_reg _ W80 _ _ = panic "F80 is not a supported register type"
229 assign_float_reg assign_slot width off r = assign_slot width off r