module CmmCallConv (
ParamLocation(..),
ArgumentFormat,
- assignRegs,
assignArguments,
+ argumentsSize,
) where
#include "HsVersions.h"
import StaticFlags (opt_Unregisterised)
import Panic
+-- Calculate the 'GlobalReg' or stack locations for function call
+-- parameters as used by the Cmm calling convention.
+
data ParamLocation
= RegisterParam GlobalReg
| 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
+type ArgumentFormat a = [(a, ParamLocation)]
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
+ assignArguments' (r:rs) offset availRegs =
+ (r,assignment):assignArguments' rs new_offset remaining
where
- (assignment, new_offset, remaining) = assign_reg (f r) offset availRegs
+ (assignment, new_offset, remaining) =
+ assign_reg (f r) offset availRegs
-type ArgumentFormat a = [(a, ParamLocation)]
+argumentsSize :: (a -> MachRep) -> [a] -> WordOff
+argumentsSize f reps = maximum (0 : map arg_top args)
+ where
+ args = assignArguments f reps
+
+ arg_top (a, StackParam offset) = -offset
+ arg_top (_, RegisterParam _) = 0
+
+-----------------------------------------------------------------------------
+-- Local information about the registers available
type AvailRegs = ( [GlobalReg] -- available vanilla regs.
, [GlobalReg] -- floats
regList f max = map f [1 .. max]
slot_size :: LocalReg -> Int
-slot_size reg = ((machRepByteWidth (localRegRep reg) - 1) `div` wORD_SIZE) + 1
+slot_size reg =
+ ((machRepByteWidth (localRegRep reg) - 1) `div` wORD_SIZE) + 1
slot_size' :: MachRep -> Int
slot_size' reg = ((machRepByteWidth reg - 1) `div` wORD_SIZE) + 1