-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/CodingStyle#Warnings
--- for details
-
module CmmCallConv (
ParamLocation(..),
ArgumentFormat,
#include "HsVersions.h"
-import Cmm
+import CmmExpr
import SMRep
+import Cmm (Convention(..))
+import PprCmm ()
import Constants
+import qualified Data.List as L
import StaticFlags (opt_Unregisterised)
import Outputable
-import Panic
-- Calculate the 'GlobalReg' or stack locations for function call
-- parameters as used by the Cmm calling convention.
= RegisterParam GlobalReg
| StackParam a
+instance (Outputable a) => Outputable (ParamLocation a) where
+ ppr (RegisterParam g) = ppr g
+ ppr (StackParam p) = ppr p
+
type ArgumentFormat a b = [(a, ParamLocation b)]
--- Stack parameters are returned as word offsets.
assignArguments :: (a -> CmmType) -> [a] -> ArgumentFormat a WordOff
-assignArguments f reps = assignments
- where
- (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs
- assignArguments' [] offset availRegs = []
- assignArguments' (r:rs) offset availRegs =
- (size,(r,assignment)):assignArguments' rs new_offset remaining
- where
- (assignment, new_offset, size, remaining) =
- assign_reg False assign_slot_up (f r) offset availRegs
+-- Stack parameters are returned as word offsets.
+assignArguments _ _ = panic "assignArguments only used in dead codegen" -- assignments
-- | 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.
--- The first argument tells us whether we are assigning positions for call arguments
--- or return results. The distinction matters because we reserve different
--- global registers in each case.
-assignArgumentsPos :: Bool -> (a -> CmmType) -> [a] -> ArgumentFormat a ByteOff
-assignArgumentsPos isCall arg_ty reps = map cvt assignments
- where
- (sizes, assignments) = unzip $ assignArguments' reps 0 availRegs
- assignArguments' [] _ _ = []
- assignArguments' (r:rs) offset avails =
- (size,(r,assignment)):assignArguments' rs new_offset remaining
- where
- (assignment, new_offset, size, remaining) =
- assign_reg isCall assign_slot_down (arg_ty r) offset avails
- cvt (l, RegisterParam r) = (l, RegisterParam r)
- cvt (l, StackParam off) = (l, StackParam $ off * wORD_SIZE)
-
+assignArgumentsPos :: (Outputable a) => Convention -> (a -> CmmType) -> [a] ->
+ ArgumentFormat a ByteOff
+-- 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
+
+
argumentsSize :: (a -> CmmType) -> [a] -> WordOff
argumentsSize f reps = maximum (0 : map arg_top args)
where
args = assignArguments f reps
- arg_top (a, StackParam offset) = -offset
+ arg_top (_, StackParam offset) = -offset
arg_top (_, RegisterParam _) = 0
-----------------------------------------------------------------------------
-- Local information about the registers available
type AvailRegs = ( [VGcPtr -> GlobalReg] -- available vanilla regs.
- , [GlobalReg] -- floats
- , [GlobalReg] -- doubles
- , [GlobalReg] -- longs (int64 and word64)
- )
+ , [GlobalReg] -- floats
+ , [GlobalReg] -- doubles
+ , [GlobalReg] -- longs (int64 and word64)
+ )
-- Vanilla registers can contain pointers, Ints, Chars.
-- Floats and doubles have separate register supplies.
-- We take these register supplies from the *real* registers, i.e. those
-- that are guaranteed to map to machine registers.
-useVanillaRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Vanilla_REG
-useFloatRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Float_REG
-useDoubleRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Double_REG
-useLongRegs | opt_Unregisterised = 0
- | otherwise = mAX_Real_Long_REG
-
-availRegs = (regList VanillaReg useVanillaRegs,
- regList FloatReg useFloatRegs,
- regList DoubleReg useDoubleRegs,
- regList LongReg useLongRegs)
- where
- regList f max = map f [1 .. max]
-
--- Round the size of a local register up to the nearest word.
-slot_size :: LocalReg -> Int
-slot_size reg = slot_size' (typeWidth (localRegType reg))
-
-slot_size' :: Width -> Int
-slot_size' reg = ((widthInBytes reg - 1) `div` wORD_SIZE) + 1
-
-type Assignment = (ParamLocation WordOff, WordOff, WordOff, AvailRegs)
-type SlotAssigner = Width -> Int -> AvailRegs -> Assignment
-
-assign_reg :: Bool -> SlotAssigner -> CmmType -> WordOff -> AvailRegs -> Assignment
-assign_reg isCall slot ty off avails
- | isFloatType ty = assign_float_reg slot width off avails
- | otherwise = assign_bits_reg isCall slot width off gcp avails
- where
- width = typeWidth ty
- gcp | isGcPtrType ty = VGcPtr
- | otherwise = VNonGcPtr
-
--- Assigning a slot on a stack that grows up:
--- JD: I don't know why this convention stops using all the registers
--- after running out of one class of registers.
-assign_slot_up :: SlotAssigner
-assign_slot_up width off regs =
- (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' width
-
--- Assigning a slot on a stack that grows down:
-assign_slot_down :: SlotAssigner
-assign_slot_down width off regs =
- (StackParam $ off + size, off + size, size, ([], [], [], []))
- where size = slot_size' width
-
--- On calls, `node` is used to hold the closure that is entered, so we can't
--- pass arguments in that register.
-assign_bits_reg _ _ W128 _ _ _ = panic "I128 is not a supported register type"
-assign_bits_reg isCall assign_slot w off gcp regs@(v:vs, fs, ds, ls) =
- if isCall && v gcp == node then
- assign_bits_reg isCall assign_slot w off gcp (vs, fs, ds, ls)
- else if widthInBits w <= widthInBits wordWidth then
- (RegisterParam (v gcp), off, 0, (vs, fs, ds, ls))
- else assign_slot w off regs
-
-assign_float_reg _ W32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
-assign_float_reg _ W64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
-assign_float_reg _ W80 off _ = panic "F80 is not a supported register type"
-assign_float_reg assign_slot width off r = assign_slot width off r
+vanillaRegNos, floatRegNos, doubleRegNos, longRegNos :: [Int]
+vanillaRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Vanilla_REG
+floatRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Float_REG
+doubleRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Double_REG
+longRegNos | opt_Unregisterised = []
+ | otherwise = regList mAX_Real_Long_REG
+
+--
+getRegsWithoutNode, getRegsWithNode :: AvailRegs
+getRegsWithoutNode =
+ (filter (\r -> r VGcPtr /= node) intRegs,
+ map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
+ where intRegs = map VanillaReg vanillaRegNos
+getRegsWithNode =
+ (intRegs, map FloatReg floatRegNos, map DoubleReg doubleRegNos, map LongReg longRegNos)
+ where intRegs = map VanillaReg vanillaRegNos
+
+allVanillaRegNos, allFloatRegNos, allDoubleRegNos, allLongRegNos :: [Int]
+allVanillaRegNos = regList mAX_Vanilla_REG
+allFloatRegNos = regList mAX_Float_REG
+allDoubleRegNos = regList mAX_Double_REG
+allLongRegNos = regList mAX_Long_REG
+
+regList :: Int -> [Int]
+regList n = [1 .. n]
+
+allRegs :: AvailRegs
+allRegs = (map VanillaReg allVanillaRegNos, map FloatReg allFloatRegNos,
+ map DoubleReg allDoubleRegNos, map LongReg allLongRegNos)
+
+noRegs :: AvailRegs
+noRegs = ([], [], [], [])
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