X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FCmmCallConv.hs;h=d24d77a41de532a05f12fc2ce77c67fa1457da4c;hb=19b44dcc5e5b9f92735fa99aa45dfaa94777177c;hp=ee16fe95c1a7c3ba72158e40801f384a4f1d476c;hpb=0e504ed52a791feb3fd265e5dfd141b5f4a8b1b6;p=ghc-hetmet.git

diff --git a/compiler/cmm/CmmCallConv.hs b/compiler/cmm/CmmCallConv.hs
index ee16fe9..d24d77a 100644
--- a/compiler/cmm/CmmCallConv.hs
+++ b/compiler/cmm/CmmCallConv.hs
@@ -1,8 +1,15 @@
+{-# 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,
-  assignRegs,
   assignArguments,
+  argumentsSize,
 ) where
 
 #include "HsVersions.h"
@@ -15,26 +22,36 @@ import Constants
 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
+assignArguments f reps = assignments
     where
+      (sizes, assignments) = unzip $ assignArguments' reps (negate (sum sizes)) availRegs
       assignArguments' [] offset availRegs = []
-      assignArguments' (r:rs) offset availRegs = (r,assignment):assignArguments' rs new_offset remaining
+      assignArguments' (r:rs) offset availRegs =
+          (size,(r,assignment)):assignArguments' rs new_offset remaining
           where 
-            (assignment, new_offset, remaining) = assign_reg (f r) offset availRegs
+            (assignment, new_offset, size, 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
@@ -65,18 +82,19 @@ availRegs = (regList VanillaReg useVanillaRegs,
       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
 
-assign_reg :: MachRep -> WordOff -> AvailRegs -> (ParamLocation, WordOff, AvailRegs)
-assign_reg I8  off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, (vs, fs, ds, ls))
-assign_reg I16 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, (vs, fs, ds, ls))
-assign_reg I32 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, (vs, fs, ds, ls))
-assign_reg I64 off (vs, fs, ds, l:ls) = (RegisterParam $ l, off, (vs, fs, ds, ls))
+assign_reg :: MachRep -> WordOff -> AvailRegs -> (ParamLocation, WordOff, WordOff, AvailRegs)
+assign_reg I8  off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls))
+assign_reg I16 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls))
+assign_reg I32 off (v:vs, fs, ds, ls) = (RegisterParam $ v, off, 0, (vs, fs, ds, ls))
+assign_reg I64 off (vs, fs, ds, l:ls) = (RegisterParam $ l, off, 0, (vs, fs, ds, ls))
 assign_reg I128 off _                 = panic "I128 is not a supported register type"
-assign_reg F32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, (vs, fs, ds, ls))
-assign_reg F64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, (vs, fs, ds, ls))
+assign_reg F32 off (vs, f:fs, ds, ls) = (RegisterParam $ f, off, 0, (vs, fs, ds, ls))
+assign_reg F64 off (vs, fs, d:ds, ls) = (RegisterParam $ d, off, 0, (vs, fs, ds, ls))
 assign_reg F80 off _                  = panic "F80 is not a supported register type"
-assign_reg reg off _                  = (StackParam $ off - size, off - size, ([], [], [], [])) where size = slot_size' reg
+assign_reg reg off _                  = (StackParam $ off, off + size, size, ([], [], [], [])) where size = slot_size' reg