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    Subject[PATCH 18/28] perf beauty: Add a generator for MAP_ mmap's flag constants
    Date
    From: Arnaldo Carvalho de Melo <acme@redhat.com>

    It'll use tools/{arch}/*,include copies of mman.h to generate a table to
    be used by tools, initially by the 'mmap' beautifiers in 'perf trace',
    but that could also be used to translate from a string constant to the
    integer value to be used in a eBPF or tracefs tracepoint filter.

    Tested for all archs using:

    $ for arch in `ls tools/arch/` ; \
    do echo $arch ; tools/perf/trace/beauty/mmap_flags.sh $arch ; \
    done | less

    Example for alpha, an oddball, doesn't include any header, defines all
    its stuff:

    $ tools/perf/trace/beauty/mmap_flags.sh alpha
    static const char *mmap_flags[] = {
    [ilog2(0x10) + 1] = "ANONYMOUS",
    [ilog2(0x02000) + 1] = "DENYWRITE",
    [ilog2(0x04000) + 1] = "EXECUTABLE",
    [ilog2(0x100) + 1] = "FIXED",
    [ilog2(0x01000) + 1] = "GROWSDOWN",
    [ilog2(0x100000) + 1] = "HUGETLB",
    [ilog2(0x08000) + 1] = "LOCKED",
    [ilog2(0x40000) + 1] = "NONBLOCK",
    [ilog2(0x10000) + 1] = "NORESERVE",
    [ilog2(0x20000) + 1] = "POPULATE",
    [ilog2(0x02) + 1] = "PRIVATE",
    [ilog2(0x01) + 1] = "SHARED",
    [ilog2(0x80000) + 1] = "STACK",
    };
    $

    Common case, my workstation, defines one entry (MAP_32BIT), then
    includes mman.h, which gets it to include mman-common.h too:

    $ tools/perf/trace/beauty/mmap_flags.sh
    static const char *mmap_flags[] = {
    [ilog2(0x40) + 1] = "32BIT",
    [ilog2(0x01) + 1] = "SHARED",
    [ilog2(0x02) + 1] = "PRIVATE",
    [ilog2(0x10) + 1] = "FIXED",
    [ilog2(0x20) + 1] = "ANONYMOUS",
    [ilog2(0x100000) + 1] = "FIXED_NOREPLACE",
    [ilog2(0x0100) + 1] = "GROWSDOWN",
    [ilog2(0x0800) + 1] = "DENYWRITE",
    [ilog2(0x1000) + 1] = "EXECUTABLE",
    [ilog2(0x2000) + 1] = "LOCKED",
    [ilog2(0x4000) + 1] = "NORESERVE",
    [ilog2(0x8000) + 1] = "POPULATE",
    [ilog2(0x10000) + 1] = "NONBLOCK",
    [ilog2(0x20000) + 1] = "STACK",
    [ilog2(0x40000) + 1] = "HUGETLB",
    [ilog2(0x80000) + 1] = "SYNC",
    };
    $ uname -m
    x86_64
    $

    Sparc, that defines a bunch then includes just mman-common.h:

    $ tools/perf/trace/beauty/mmap_flags.sh sparc
    static const char *mmap_flags[] = {
    [ilog2(0x0800) + 1] = "DENYWRITE",
    [ilog2(0x1000) + 1] = "EXECUTABLE",
    [ilog2(0x0200) + 1] = "GROWSDOWN",
    [ilog2(0x40000) + 1] = "HUGETLB",
    [ilog2(0x100) + 1] = "LOCKED",
    [ilog2(0x10000) + 1] = "NONBLOCK",
    [ilog2(0x40) + 1] = "NORESERVE",
    [ilog2(0x8000) + 1] = "POPULATE",
    [ilog2(0x20000) + 1] = "STACK",
    [ilog2(0x01) + 1] = "SHARED",
    [ilog2(0x02) + 1] = "PRIVATE",
    [ilog2(0x10) + 1] = "FIXED",
    [ilog2(0x20) + 1] = "ANONYMOUS",
    [ilog2(0x100000) + 1] = "FIXED_NOREPLACE",
    };
    [acme@jouet perf]$

    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: https://lkml.kernel.org/n/tip-xydeh491z8fkgglcmqnl5thj@git.kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/trace/beauty/mmap_flags.sh | 32 ++++++++++++++++++++++++++++++++
    1 file changed, 32 insertions(+)
    create mode 100755 tools/perf/trace/beauty/mmap_flags.sh

    diff --git a/tools/perf/trace/beauty/mmap_flags.sh b/tools/perf/trace/beauty/mmap_flags.sh
    new file mode 100755
    index 000000000000..22c3fdca8975
    --- /dev/null
    +++ b/tools/perf/trace/beauty/mmap_flags.sh
    @@ -0,0 +1,32 @@
    +#!/bin/sh
    +# SPDX-License-Identifier: LGPL-2.1
    +
    +if [ $# -ne 2 ] ; then
    + [ $# -eq 1 ] && hostarch=$1 || hostarch=`uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/`
    + header_dir=tools/include/uapi/asm-generic
    + arch_header_dir=tools/arch/${hostarch}/include/uapi/asm
    +else
    + header_dir=$1
    + arch_header_dir=$2
    +fi
    +
    +arch_mman=${arch_header_dir}/mman.h
    +
    +# those in egrep -vw are flags, we want just the bits
    +
    +printf "static const char *mmap_flags[] = {\n"
    +regex='^[[:space:]]*#[[:space:]]*define[[:space:]]+MAP_([[:alnum:]_]+)[[:space:]]+(0x[[:xdigit:]]+)[[:space:]]*.*'
    +egrep -q $regex ${arch_mman} && \
    +(egrep $regex ${arch_mman} | \
    + sed -r "s/$regex/\2 \1/g" | \
    + xargs printf "\t[ilog2(%s) + 1] = \"%s\",\n")
    +egrep -q '#[[:space:]]*include[[:space:]]+<uapi/asm-generic/mman.*' ${arch_mman} &&
    +(egrep $regex ${header_dir}/mman-common.h | \
    + egrep -vw 'MAP_(UNINITIALIZED|TYPE|SHARED_VALIDATE)' | \
    + sed -r "s/$regex/\2 \1/g" | \
    + xargs printf "\t[ilog2(%s) + 1] = \"%s\",\n")
    +egrep -q '#[[:space:]]*include[[:space:]]+<uapi/asm-generic/mman.h>.*' ${arch_mman} &&
    +(egrep $regex ${header_dir}/mman.h | \
    + sed -r "s/$regex/\2 \1/g" | \
    + xargs printf "\t[ilog2(%s) + 1] = \"%s\",\n")
    +printf "};\n"
    --
    2.14.4
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