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authorAlan Maguire <alan.maguire@oracle.com>2020-09-28 12:31:04 +0100
committerAlexei Starovoitov <ast@kernel.org>2020-09-28 18:26:58 -0700
commit31d0bc81637d8d974a6dad9827b765b4b70c89d7 (patch)
tree95012b4f5c189b4ae257f45f102c41ea92c519e9 /tools
parent76654e67f3a01c50dc13dd6dea75e58943413956 (diff)
bpf: Move to generic BTF show support, apply it to seq files/strings
generalize the "seq_show" seq file support in btf.c to support a generic show callback of which we support two instances; the current seq file show, and a show with snprintf() behaviour which instead writes the type data to a supplied string. Both classes of show function call btf_type_show() with different targets; the seq file or the string to be written. In the string case we need to track additional data - length left in string to write and length to return that we would have written (a la snprintf). By default show will display type information, field members and their types and values etc, and the information is indented based upon structure depth. Zeroed fields are omitted. Show however supports flags which modify its behaviour: BTF_SHOW_COMPACT - suppress newline/indent. BTF_SHOW_NONAME - suppress show of type and member names. BTF_SHOW_PTR_RAW - do not obfuscate pointer values. BTF_SHOW_UNSAFE - do not copy data to safe buffer before display. BTF_SHOW_ZERO - show zeroed values (by default they are not shown). Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/1601292670-1616-3-git-send-email-alan.maguire@oracle.com
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