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#!/bin/sh
#
# Usage: size_classes.sh <lg_qarr> <lg_tmin> <lg_parr> <lg_g>
# The following limits are chosen such that they cover all supported platforms.
# Pointer sizes.
lg_zarr="2 3"
# Quanta.
lg_qarr=$1
# The range of tiny size classes is [2^lg_tmin..2^(lg_q-1)].
lg_tmin=$2
# Maximum lookup size.
lg_kmax=12
# Page sizes.
lg_parr=`echo $3 | tr ',' ' '`
# Size class group size (number of size classes for each size doubling).
lg_g=$4
pow2() {
e=$1
pow2_result=1
while [ ${e} -gt 0 ] ; do
pow2_result=$((${pow2_result} + ${pow2_result}))
e=$((${e} - 1))
done
}
lg() {
x=$1
lg_result=0
while [ ${x} -gt 1 ] ; do
lg_result=$((${lg_result} + 1))
x=$((${x} / 2))
done
}
size_class() {
index=$1
lg_grp=$2
lg_delta=$3
ndelta=$4
lg_p=$5
lg_kmax=$6
if [ ${lg_delta} -ge ${lg_p} ] ; then
psz="yes"
else
pow2 ${lg_p}; p=${pow2_result}
pow2 ${lg_grp}; grp=${pow2_result}
pow2 ${lg_delta}; delta=${pow2_result}
sz=$((${grp} + ${delta} * ${ndelta}))
npgs=$((${sz} / ${p}))
if [ ${sz} -eq $((${npgs} * ${p})) ] ; then
psz="yes"
else
psz="no"
fi
fi
lg ${ndelta}; lg_ndelta=${lg_result}; pow2 ${lg_ndelta}
if [ ${pow2_result} -lt ${ndelta} ] ; then
rem="yes"
else
rem="no"
fi
lg_size=${lg_grp}
if [ $((${lg_delta} + ${lg_ndelta})) -eq ${lg_grp} ] ; then
lg_size=$((${lg_grp} + 1))
else
lg_size=${lg_grp}
rem="yes"
fi
if [ ${lg_size} -lt $((${lg_p} + ${lg_g})) ] ; then
bin="yes"
else
bin="no"
fi
if [ ${lg_size} -lt ${lg_kmax} \
-o ${lg_size} -eq ${lg_kmax} -a ${rem} = "no" ] ; then
lg_delta_lookup=${lg_delta}
else
lg_delta_lookup="no"
fi
printf ' SC(%3d, %6d, %8d, %6d, %3s, %3s, %2s) \\\n' ${index} ${lg_grp} ${lg_delta} ${ndelta} ${psz} ${bin} ${lg_delta_lookup}
# Defined upon return:
# - psz ("yes" or "no")
# - bin ("yes" or "no")
# - lg_delta_lookup (${lg_delta} or "no")
}
sep_line() {
echo " \\"
}
size_classes() {
lg_z=$1
lg_q=$2
lg_t=$3
lg_p=$4
lg_g=$5
pow2 $((${lg_z} + 3)); ptr_bits=${pow2_result}
pow2 ${lg_g}; g=${pow2_result}
echo "#define SIZE_CLASSES \\"
echo " /* index, lg_grp, lg_delta, ndelta, psz, bin, lg_delta_lookup */ \\"
ntbins=0
nlbins=0
lg_tiny_maxclass='"NA"'
nbins=0
npsizes=0
# Tiny size classes.
ndelta=0
index=0
lg_grp=${lg_t}
lg_delta=${lg_grp}
while [ ${lg_grp} -lt ${lg_q} ] ; do
size_class ${index} ${lg_grp} ${lg_delta} ${ndelta} ${lg_p} ${lg_kmax}
if [ ${lg_delta_lookup} != "no" ] ; then
nlbins=$((${index} + 1))
fi
if [ ${psz} = "yes" ] ; then
npsizes=$((${npsizes} + 1))
fi
if [ ${bin} != "no" ] ; then
nbins=$((${index} + 1))
fi
ntbins=$((${ntbins} + 1))
lg_tiny_maxclass=${lg_grp} # Final written value is correct.
index=$((${index} + 1))
lg_delta=${lg_grp}
lg_grp=$((${lg_grp} + 1))
done
# First non-tiny group.
if [ ${ntbins} -gt 0 ] ; then
sep_line
# The first size class has an unusual encoding, because the size has to be
# split between grp and delta*ndelta.
lg_grp=$((${lg_grp} - 1))
ndelta=1
size_class ${index} ${lg_grp} ${lg_delta} ${ndelta} ${lg_p} ${lg_kmax}
index=$((${index} + 1))
lg_grp=$((${lg_grp} + 1))
lg_delta=$((${lg_delta} + 1))
if [ ${psz} = "yes" ] ; then
npsizes=$((${npsizes} + 1))
fi
fi
while [ ${ndelta} -lt ${g} ] ; do
size_class ${index} ${lg_grp} ${lg_delta} ${ndelta} ${lg_p} ${lg_kmax}
index=$((${index} + 1))
ndelta=$((${ndelta} + 1))
if [ ${psz} = "yes" ] ; then
npsizes=$((${npsizes} + 1))
fi
done
# All remaining groups.
lg_grp=$((${lg_grp} + ${lg_g}))
while [ ${lg_grp} -lt $((${ptr_bits} - 1)) ] ; do
sep_line
ndelta=1
if [ ${lg_grp} -eq $((${ptr_bits} - 2)) ] ; then
ndelta_limit=$((${g} - 1))
else
ndelta_limit=${g}
fi
while [ ${ndelta} -le ${ndelta_limit} ] ; do
size_class ${index} ${lg_grp} ${lg_delta} ${ndelta} ${lg_p} ${lg_kmax}
if [ ${lg_delta_lookup} != "no" ] ; then
nlbins=$((${index} + 1))
# Final written value is correct:
lookup_maxclass="((((size_t)1) << ${lg_grp}) + (((size_t)${ndelta}) << ${lg_delta}))"
fi
if [ ${psz} = "yes" ] ; then
npsizes=$((${npsizes} + 1))
fi
if [ ${bin} != "no" ] ; then
nbins=$((${index} + 1))
# Final written value is correct:
small_maxclass="((((size_t)1) << ${lg_grp}) + (((size_t)${ndelta}) << ${lg_delta}))"
if [ ${lg_g} -gt 0 ] ; then
lg_large_minclass=$((${lg_grp} + 1))
else
lg_large_minclass=$((${lg_grp} + 2))
fi
fi
# Final written value is correct:
huge_maxclass="((((size_t)1) << ${lg_grp}) + (((size_t)${ndelta}) << ${lg_delta}))"
index=$((${index} + 1))
ndelta=$((${ndelta} + 1))
done
lg_grp=$((${lg_grp} + 1))
lg_delta=$((${lg_delta} + 1))
done
echo
nsizes=${index}
# Defined upon completion:
# - ntbins
# - nlbins
# - nbins
# - nsizes
# - npsizes
# - lg_tiny_maxclass
# - lookup_maxclass
# - small_maxclass
# - lg_large_minclass
# - huge_maxclass
}
cat <<EOF
/* This file was automatically generated by size_classes.sh. */
/******************************************************************************/
#ifdef JEMALLOC_H_TYPES
/*
* This header requires LG_SIZEOF_PTR, LG_TINY_MIN, LG_QUANTUM, and LG_PAGE to
* be defined prior to inclusion, and it in turn defines:
*
* LG_SIZE_CLASS_GROUP: Lg of size class count for each size doubling.
* SIZE_CLASSES: Complete table of SC(index, lg_grp, lg_delta, ndelta, psz,
* bin, lg_delta_lookup) tuples.
* index: Size class index.
* lg_grp: Lg group base size (no deltas added).
* lg_delta: Lg delta to previous size class.
* ndelta: Delta multiplier. size == 1<<lg_grp + ndelta<<lg_delta
* psz: 'yes' if a multiple of the page size, 'no' otherwise.
* bin: 'yes' if a small bin size class, 'no' otherwise.
* lg_delta_lookup: Same as lg_delta if a lookup table size class, 'no'
* otherwise.
* NTBINS: Number of tiny bins.
* NLBINS: Number of bins supported by the lookup table.
* NBINS: Number of small size class bins.
* NSIZES: Number of size classes.
* NPSIZES: Number of size classes that are a multiple of (1U << LG_PAGE).
* LG_TINY_MAXCLASS: Lg of maximum tiny size class.
* LOOKUP_MAXCLASS: Maximum size class included in lookup table.
* SMALL_MAXCLASS: Maximum small size class.
* LG_LARGE_MINCLASS: Lg of minimum large size class.
* HUGE_MAXCLASS: Maximum (huge) size class.
*/
#define LG_SIZE_CLASS_GROUP ${lg_g}
EOF
for lg_z in ${lg_zarr} ; do
for lg_q in ${lg_qarr} ; do
lg_t=${lg_tmin}
while [ ${lg_t} -le ${lg_q} ] ; do
# Iterate through page sizes and compute how many bins there are.
for lg_p in ${lg_parr} ; do
echo "#if (LG_SIZEOF_PTR == ${lg_z} && LG_TINY_MIN == ${lg_t} && LG_QUANTUM == ${lg_q} && LG_PAGE == ${lg_p})"
size_classes ${lg_z} ${lg_q} ${lg_t} ${lg_p} ${lg_g}
echo "#define SIZE_CLASSES_DEFINED"
echo "#define NTBINS ${ntbins}"
echo "#define NLBINS ${nlbins}"
echo "#define NBINS ${nbins}"
echo "#define NSIZES ${nsizes}"
echo "#define NPSIZES ${npsizes}"
echo "#define LG_TINY_MAXCLASS ${lg_tiny_maxclass}"
echo "#define LOOKUP_MAXCLASS ${lookup_maxclass}"
echo "#define SMALL_MAXCLASS ${small_maxclass}"
echo "#define LG_LARGE_MINCLASS ${lg_large_minclass}"
echo "#define HUGE_MAXCLASS ${huge_maxclass}"
echo "#endif"
echo
done
lg_t=$((${lg_t} + 1))
done
done
done
cat <<EOF
#ifndef SIZE_CLASSES_DEFINED
# error "No size class definitions match configuration"
#endif
#undef SIZE_CLASSES_DEFINED
/*
* The size2index_tab lookup table uses uint8_t to encode each bin index, so we
* cannot support more than 256 small size classes. Further constrain NBINS to
* 255 since all small size classes, plus a "not small" size class must be
* stored in 8 bits of arena_chunk_map_bits_t's bits field.
*/
#if (NBINS > 255)
# error "Too many small size classes"
#endif
#endif /* JEMALLOC_H_TYPES */
/******************************************************************************/
#ifdef JEMALLOC_H_STRUCTS
#endif /* JEMALLOC_H_STRUCTS */
/******************************************************************************/
#ifdef JEMALLOC_H_EXTERNS
#endif /* JEMALLOC_H_EXTERNS */
/******************************************************************************/
#ifdef JEMALLOC_H_INLINES
#endif /* JEMALLOC_H_INLINES */
/******************************************************************************/
EOF
|