8 #include "HsVersions.h"
15 import StaticFlags (opt_Unregisterised)
18 -- Calculate the 'GlobalReg' or stack locations for function call
19 -- parameters as used by the Cmm calling convention.
22 = RegisterParam GlobalReg
25 type ArgumentFormat a = [(a, ParamLocation)]
27 assignArguments :: (a -> MachRep) -> [a] -> ArgumentFormat a
28 assignArguments f reps = assignments
30 (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs
31 assignArguments' [] offset availRegs = []
32 assignArguments' (r:rs) offset availRegs =
33 (size,(r,assignment)):assignArguments' rs new_offset remaining
35 (assignment, new_offset, size, remaining) =
36 assign_reg (f r) offset availRegs
38 argumentsSize :: (a -> MachRep) -> [a] -> WordOff
39 argumentsSize f reps = maximum (0 : map arg_top args)
41 args = assignArguments f reps
43 arg_top (a, StackParam offset) = -offset
44 arg_top (_, RegisterParam _) = 0
46 -----------------------------------------------------------------------------
47 -- Local information about the registers available
49 type AvailRegs = ( [GlobalReg] -- available vanilla regs.
50 , [GlobalReg] -- floats
51 , [GlobalReg] -- doubles
52 , [GlobalReg] -- longs (int64 and word64)
55 -- Vanilla registers can contain pointers, Ints, Chars.
56 -- Floats and doubles have separate register supplies.
58 -- We take these register supplies from the *real* registers, i.e. those
59 -- that are guaranteed to map to machine registers.
61 useVanillaRegs | opt_Unregisterised = 0
62 | otherwise = mAX_Real_Vanilla_REG
63 useFloatRegs | opt_Unregisterised = 0
64 | otherwise = mAX_Real_Float_REG
65 useDoubleRegs | opt_Unregisterised = 0
66 | otherwise = mAX_Real_Double_REG
67 useLongRegs | opt_Unregisterised = 0
68 | otherwise = mAX_Real_Long_REG
70 availRegs = (regList VanillaReg useVanillaRegs,
71 regList FloatReg useFloatRegs,
72 regList DoubleReg useDoubleRegs,
73 regList LongReg useLongRegs)
75 regList f max = map f [1 .. max]
77 slot_size :: LocalReg -> Int
79 ((machRepByteWidth (localRegRep reg) - 1) `div` wORD_SIZE) + 1
81 slot_size' :: MachRep -> Int
82 slot_size' reg = ((machRepByteWidth reg - 1) `div` wORD_SIZE) + 1
84 assign_reg :: MachRep -> WordOff -> AvailRegs -> (ParamLocation, WordOff, WordOff, AvailRegs)
85 assign_reg I8 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls))
86 assign_reg I16 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls))
87 assign_reg I32 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls))
88 assign_reg I64 off (vs, fs, ds, l:ls) = (RegisterParam $ l, off, 0, (vs, fs, ds, ls))
89 assign_reg I128 off _ = panic "I128 is not a supported register type"
90 assign_reg F32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
91 assign_reg F64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
92 assign_reg F80 off _ = panic "F80 is not a supported register type"
93 assign_reg reg off _ = (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' reg