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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[Constants]{Info about this compilation}
\begin{code}
{-# 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/Commentary/CodingStyle#Warnings
-- for details
module Constants (module Constants) where
import Data.Bits (shiftL)
-- This magical #include brings in all the everybody-knows-these magic
-- constants unfortunately, we need to be *explicit* about which one
-- we want; if we just hope a -I... will get the right one, we could
-- be in trouble.
#include "HsVersions.h"
#include "../includes/MachRegs.h"
#include "../includes/Constants.h"
#include "../includes/MachDeps.h"
#include "../includes/DerivedConstants.h"
-- import Util
\end{code}
All pretty arbitrary:
\begin{code}
mAX_TUPLE_SIZE = (62 :: Int) -- Should really match the number
-- of decls in Data.Tuple
mAX_CONTEXT_REDUCTION_DEPTH = (20 :: Int)
\end{code}
\begin{code}
-- specialised fun/thunk/constr closure types
mAX_SPEC_THUNK_SIZE = (MAX_SPEC_THUNK_SIZE :: Int)
mAX_SPEC_FUN_SIZE = (MAX_SPEC_FUN_SIZE :: Int)
mAX_SPEC_CONSTR_SIZE = (MAX_SPEC_CONSTR_SIZE :: Int)
-- pre-compiled thunk types
mAX_SPEC_SELECTEE_SIZE = (MAX_SPEC_SELECTEE_SIZE :: Int)
mAX_SPEC_AP_SIZE = (MAX_SPEC_AP_SIZE :: Int)
-- closure sizes: these do NOT include the header (see below for header sizes)
mIN_PAYLOAD_SIZE = (MIN_PAYLOAD_SIZE::Int)
\end{code}
\begin{code}
mIN_INTLIKE, mAX_INTLIKE :: Int
mIN_INTLIKE = MIN_INTLIKE
mAX_INTLIKE = MAX_INTLIKE
mIN_CHARLIKE, mAX_CHARLIKE :: Int
mIN_CHARLIKE = MIN_CHARLIKE
mAX_CHARLIKE = MAX_CHARLIKE
\end{code}
A section of code-generator-related MAGIC CONSTANTS.
\begin{code}
mAX_Vanilla_REG = (MAX_VANILLA_REG :: Int)
mAX_Float_REG = (MAX_FLOAT_REG :: Int)
mAX_Double_REG = (MAX_DOUBLE_REG :: Int)
mAX_Long_REG = (MAX_LONG_REG :: Int)
mAX_Real_Vanilla_REG = (MAX_REAL_VANILLA_REG :: Int)
mAX_Real_Float_REG = (MAX_REAL_FLOAT_REG :: Int)
mAX_Real_Double_REG = (MAX_REAL_DOUBLE_REG :: Int)
#ifdef MAX_REAL_LONG_REG
mAX_Real_Long_REG = (MAX_REAL_LONG_REG :: Int)
#else
mAX_Real_Long_REG = (0::Int)
#endif
\end{code}
Closure header sizes.
\begin{code}
sTD_HDR_SIZE = (STD_HDR_SIZE :: Int)
pROF_HDR_SIZE = (PROF_HDR_SIZE :: Int)
gRAN_HDR_SIZE = (GRAN_HDR_SIZE :: Int)
\end{code}
Size of a double in StgWords.
\begin{code}
dOUBLE_SIZE = SIZEOF_DOUBLE :: Int
wORD64_SIZE = 8 :: Int
iNT64_SIZE = wORD64_SIZE
\end{code}
This tells the native code generator the size of the spill
area is has available.
\begin{code}
rESERVED_C_STACK_BYTES = (RESERVED_C_STACK_BYTES :: Int)
\end{code}
The amount of (Haskell) stack to leave free for saving registers when
returning to the scheduler.
\begin{code}
rESERVED_STACK_WORDS = (RESERVED_STACK_WORDS :: Int)
\end{code}
Continuations that need more than this amount of stack should do their
own stack check (see bug #1466).
\begin{code}
aP_STACK_SPLIM = (AP_STACK_SPLIM :: Int)
\end{code}
Size of a word, in bytes
\begin{code}
wORD_SIZE = (SIZEOF_HSWORD :: Int)
wORD_SIZE_IN_BITS = wORD_SIZE * 8 :: Int
\end{code}
Amount of pointer bits used for semi-tagging constructor closures
\begin{code}
tAG_BITS = (TAG_BITS :: Int)
tAG_MASK = ((1 `shiftL` tAG_BITS) - 1) :: Int
mAX_PTR_TAG = tAG_MASK :: Int
\end{code}
Size of a C int, in bytes. May be smaller than wORD_SIZE.
\begin{code}
cINT_SIZE = (SIZEOF_INT :: Int)
\end{code}
Size of a storage manager block (in bytes).
\begin{code}
bLOCK_SIZE = (BLOCK_SIZE :: Int)
bLOCK_SIZE_W = (bLOCK_SIZE `quot` wORD_SIZE :: Int)
\end{code}
Number of bits to shift a bitfield left by in an info table.
\begin{code}
bITMAP_BITS_SHIFT = (BITMAP_BITS_SHIFT :: Int)
\end{code}
Constants derived from headers in ghc/includes, generated by the program
../includes/mkDerivedConstants.c.
\begin{code}
#include "../includes/GHCConstants.h"
\end{code}
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