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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[Constants]{Info about this compilation}
\begin{code}
module Constants (
mAX_CONTEXT_REDUCTION_DEPTH,
mAX_TUPLE_SIZE,
mAX_SPEC_THUNK_SIZE,
mAX_SPEC_FUN_SIZE,
mAX_SPEC_CONSTR_SIZE,
mAX_SPEC_SELECTEE_SIZE,
mAX_SPEC_AP_SIZE,
mIN_UPD_SIZE,
mIN_SIZE_NonUpdHeapObject,
sTD_HDR_SIZE,
pROF_HDR_SIZE,
gRAN_HDR_SIZE,
aRR_WORDS_HDR_SIZE,
aRR_PTRS_HDR_SIZE,
rESERVED_C_STACK_BYTES,
rESERVED_STACK_WORDS,
sTD_ITBL_SIZE,
rET_ITBL_SIZE,
pROF_ITBL_SIZE,
gRAN_ITBL_SIZE,
tICKY_ITBL_SIZE,
mAX_FAMILY_SIZE_FOR_VEC_RETURNS,
uF_SIZE,
pROF_UF_SIZE,
gRAN_UF_SIZE, -- HWL
uF_RET,
uF_UPDATEE,
mAX_Vanilla_REG,
mAX_Float_REG,
mAX_Double_REG,
mAX_Long_REG,
mAX_Real_Vanilla_REG,
mAX_Real_Float_REG,
mAX_Real_Double_REG,
mAX_Real_Long_REG,
oTHER_TAG,
mAX_INTLIKE, mIN_INTLIKE,
mAX_CHARLIKE, mIN_CHARLIKE,
spRelToInt,
dOUBLE_SIZE,
iNT64_SIZE,
wORD64_SIZE,
wORD_SIZE,
bLOCK_SIZE,
bLOCK_SIZE_W,
bITMAP_BITS_SHIFT,
) where
-- 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/config.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_UPD_SIZE = (MIN_UPD_SIZE::Int)
mIN_SIZE_NonUpdHeapObject = (MIN_NONUPD_SIZE::Int)
\end{code}
Constants for semi-tagging; the tags associated with the data
constructors will start at 0 and go up.
\begin{code}
oTHER_TAG = (INFO_OTHER_TAG :: Integer) -- (-1) unevaluated, probably
\end{code}
\begin{code}
mIN_INTLIKE, mAX_INTLIKE :: Integer -- Only used to compare with (MachInt Integer)
mIN_INTLIKE = MIN_INTLIKE
mAX_INTLIKE = MAX_INTLIKE
mIN_CHARLIKE, mAX_CHARLIKE :: Int -- Only used to compare with (MachChar Int)
mIN_CHARLIKE = MIN_CHARLIKE
mAX_CHARLIKE = MAX_CHARLIKE
\end{code}
A little function that abstracts the stack direction. Note that most
of the code generator is dependent on the stack direction anyway, so
changing this on its own spells certain doom. ToDo: remove?
\begin{code}
-- THIS IS DIRECTION SENSITIVE!
-- stack grows down, positive virtual offsets correspond to negative
-- additions to the stack pointer.
spRelToInt :: Int{-VirtualSpOffset-} -> Int{-VirtualSpOffset-} -> Int
spRelToInt sp off = sp - off
\end{code}
A section of code-generator-related MAGIC CONSTANTS.
\begin{code}
mAX_FAMILY_SIZE_FOR_VEC_RETURNS = (MAX_VECTORED_RTN::Int) -- pretty arbitrary
-- If you change this, you may need to change runtimes/standard/Update.lhc
-- The update frame sizes
uF_SIZE = (STD_UF_SIZE::Int)
-- Same again, with profiling
pROF_UF_SIZE = (PROF_UF_SIZE::Int)
-- Same again, with gransim
gRAN_UF_SIZE = (GRAN_UF_SIZE::Int)
-- Offsets in an update frame. They don't change with profiling!
uF_RET = (UF_RET::Int)
uF_UPDATEE = (UF_UPDATEE::Int)
\end{code}
\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)
aRR_WORDS_HDR_SIZE = (ARR_WORDS_HDR_SIZE :: Int)
aRR_PTRS_HDR_SIZE = (ARR_PTRS_HDR_SIZE :: Int)
\end{code}
Info Table sizes.
\begin{code}
sTD_ITBL_SIZE = (STD_ITBL_SIZE :: Int)
rET_ITBL_SIZE = (RET_ITBL_SIZE :: Int)
pROF_ITBL_SIZE = (PROF_ITBL_SIZE :: Int)
gRAN_ITBL_SIZE = (GRAN_ITBL_SIZE :: Int)
tICKY_ITBL_SIZE = (TICKY_ITBL_SIZE :: Int)
\end{code}
Size of a double in StgWords.
\begin{code}
dOUBLE_SIZE = (SIZEOF_DOUBLE `quot` SIZEOF_HSWORD :: Int)
wORD64_SIZE = (8 `quot` SIZEOF_HSWORD :: 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}
Size of a word, in bytes
\begin{code}
wORD_SIZE = (SIZEOF_HSWORD :: Int)
\end{code}
Size of a storage manager block (in bytes).
\begin{code}
bLOCK_SIZE = (BLOCK_SIZE :: Int)
bLOCK_SIZE_W = (bLOCK_SIZE `div` 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}
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