- | StackParam WordOff
-
-assignRegs :: [LocalReg] -> ArgumentFormat LocalReg
-assignRegs regs = assignRegs' regs 0 availRegs
- where
- assignRegs' (r:rs) offset availRegs = (r,assignment):assignRegs' rs new_offset remaining
- where
- (assignment, new_offset, remaining) = assign_reg (localRegRep r) offset availRegs
-
-assignArguments :: (a -> MachRep) -> [a] -> ArgumentFormat a
-assignArguments f reps = assignArguments' reps 0 availRegs
- where
- assignArguments' [] offset availRegs = []
- assignArguments' (r:rs) offset availRegs = (r,assignment):assignArguments' rs new_offset remaining
- where
- (assignment, new_offset, remaining) = assign_reg (f r) offset availRegs
-
-type ArgumentFormat a = [(a, ParamLocation)]
-
-type AvailRegs = ( [GlobalReg] -- available vanilla regs.
- , [GlobalReg] -- floats
- , [GlobalReg] -- doubles
- , [GlobalReg] -- longs (int64 and word64)
- )
+ | StackParam ByteOff
+
+instance Outputable ParamLocation where
+ ppr (RegisterParam g) = ppr g
+ ppr (StackParam p) = ppr p
+
+-- | JD: For the new stack story, I want arguments passed on the stack to manifest as
+-- positive offsets in a CallArea, not negative offsets from the stack pointer.
+-- Also, I want byte offsets, not word offsets.
+assignArgumentsPos :: Convention -> (a -> CmmType) -> [a] ->
+ [(a, ParamLocation)]
+-- Given a list of arguments, and a function that tells their types,
+-- return a list showing where each argument is passed
+assignArgumentsPos conv arg_ty reps = assignments
+ where -- The calling conventions (CgCallConv.hs) are complicated, to say the least
+ regs = case (reps, conv) of
+ (_, NativeNodeCall) -> getRegsWithNode
+ (_, NativeDirectCall) -> getRegsWithoutNode
+ ([_], NativeReturn) -> allRegs
+ (_, NativeReturn) -> getRegsWithNode
+ -- GC calling convention *must* put values in registers
+ (_, GC) -> allRegs
+ (_, PrimOpCall) -> allRegs
+ ([_], PrimOpReturn) -> allRegs
+ (_, PrimOpReturn) -> getRegsWithNode
+ (_, Slow) -> noRegs
+ _ -> pprPanic "Unknown calling convention" (ppr conv)
+ -- The calling conventions first assign arguments to registers,
+ -- then switch to the stack when we first run out of registers
+ -- (even if there are still available registers for args of a different type).
+ -- When returning an unboxed tuple, we also separate the stack
+ -- arguments by pointerhood.
+ (reg_assts, stk_args) = assign_regs [] reps regs
+ stk_args' = case conv of NativeReturn -> part
+ PrimOpReturn -> part
+ GC | length stk_args /= 0 -> panic "Failed to allocate registers for GC call"
+ _ -> stk_args
+ where part = uncurry (++)
+ (L.partition (not . isGcPtrType . arg_ty) stk_args)
+ stk_assts = assign_stk 0 [] (reverse stk_args')
+ assignments = reg_assts ++ stk_assts
+
+ assign_regs assts [] _ = (assts, [])
+ assign_regs assts (r:rs) regs = if isFloatType ty then float else int
+ where float = case (w, regs) of
+ (W32, (vs, f:fs, ds, ls)) -> k (RegisterParam f, (vs, fs, ds, ls))
+ (W64, (vs, fs, d:ds, ls)) -> k (RegisterParam d, (vs, fs, ds, ls))
+ (W80, _) -> panic "F80 unsupported register type"
+ _ -> (assts, (r:rs))
+ int = case (w, regs) of
+ (W128, _) -> panic "W128 unsupported register type"
+ (_, (v:vs, fs, ds, ls)) | widthInBits w <= widthInBits wordWidth
+ -> k (RegisterParam (v gcp), (vs, fs, ds, ls))
+ (_, (vs, fs, ds, l:ls)) | widthInBits w > widthInBits wordWidth
+ -> k (RegisterParam l, (vs, fs, ds, ls))
+ _ -> (assts, (r:rs))
+ k (asst, regs') = assign_regs ((r, asst) : assts) rs regs'
+ ty = arg_ty r
+ w = typeWidth ty
+ gcp | isGcPtrType ty = VGcPtr
+ | otherwise = VNonGcPtr
+
+ assign_stk _ assts [] = assts
+ assign_stk offset assts (r:rs) = assign_stk off' ((r, StackParam off') : assts) rs
+ where w = typeWidth (arg_ty r)
+ size = (((widthInBytes w - 1) `div` wORD_SIZE) + 1) * wORD_SIZE
+ off' = offset + size
+
+-----------------------------------------------------------------------------
+-- Local information about the registers available
+
+type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
+ , [GlobalReg] -- floats
+ , [GlobalReg] -- doubles
+ , [GlobalReg] -- longs (int64 and word64)
+ )