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Re: [PATCH 2/4] Add Jeff Mahoney's py-crash patches.
- From: Jeff Mahoney <jeffm at suse dot com>
- To: Doug Evans <dje at google dot com>, Ales Novak <alnovak at suse dot cz>
- Cc: gdb-patches <gdb-patches at sourceware dot org>
- Date: Mon, 1 Feb 2016 21:55:53 -0500
- Subject: Re: [PATCH 2/4] Add Jeff Mahoney's py-crash patches.
- Authentication-results: sourceware.org; auth=none
- References: <1454276692-7119-1-git-send-email-alnovak at suse dot cz> <1454276692-7119-3-git-send-email-alnovak at suse dot cz> <CADPb22TwarW84NbuqczsjFFq5DPEEMVuyHjtFHGU4LVBjj6wGQ at mail dot gmail dot com>
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On 2/1/16 5:22 PM, Doug Evans wrote:
> On Sun, Jan 31, 2016 at 1:44 PM, Ales Novak <alnovak@suse.cz>
> wrote:
>> --- gdb/Makefile.in | 12 ++
>> gdb/python/py-minsymbol.c | 353
>> +++++++++++++++++++++++++++++++++++++ gdb/python/py-objfile.c
>> | 29 +++- gdb/python/py-section.c | 401
>> +++++++++++++++++++++++++++++++++++++++++++
>> gdb/python/py-symbol.c | 52 ++++--
>> gdb/python/python-internal.h | 14 ++ gdb/python/python.c
>> | 7 +- 7 files changed, 853 insertions(+), 15 deletions(-)
>> create mode 100644 gdb/python/py-minsymbol.c create mode 100644
>> gdb/python/py-section.c
>
>
> Hi.
Hi Doug -
> Part of what this patch is doing is exporting bfd to python. E.g.,
> all the SEC_* constants.
>
> As a rule we absolutely discourage people from using bfd outside
> of the the binutils+gdb source tree. Either this rule needs to
> change, or I don't think we can allow this patch. I'd be interested
> to hear what others in the community think.
That's unfortunate. The Linux kernel uses ELF sections for a number
of purposes. Most notably is the definition of per-cpu variables.
Without the ELF section, we can't resolve the addresses for the
variables. So, from our perspective, it's a requirement.
> For myself, I would much rather export ELF separately (e.g., a
> separate python API one can use independent of any particular tool,
> including gdb), and then have gdb provide the necessary glue to use
> this API. [I can imagine some compromises being needed, at least
> for now; e.g., it'd be cumbersome to read in all ELF symbols
> twice. But fixing that is just an optimization.]
Ok, that's doable. As it is, the section code mixes GDB and BFD
pretty heavily. It shouldn't be too difficult to separate the two out
and push the section stuff into a new BFD python interface and
associate the objfiles with it.
- -Jeff
>
>> ... + if (PyModule_AddIntConstant (gdb_module, "SEC_NO_FLAGS",
>> SEC_NO_FLAGS) < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_ALLOC", SEC_ALLOC) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_LOAD", SEC_LOAD) < 0 + ||
>> PyModule_AddIntConstant (gdb_module, "SEC_RELOC", SEC_RELOC) < 0
>> + || PyModule_AddIntConstant (gdb_module, "SEC_READONLY",
>> SEC_READONLY) < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_CODE", SEC_CODE) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_DATA", SEC_DATA) < 0 + ||
>> PyModule_AddIntConstant (gdb_module, "SEC_ROM", SEC_ROM) < 0 +
>> || PyModule_AddIntConstant (gdb_module, "SEC_CONSTRUCTOR", +
>> SEC_CONSTRUCTOR) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_HAS_CONTENTS", +
>> SEC_HAS_CONTENTS) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_NEVER_LOAD", +
>> SEC_NEVER_LOAD) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_THREAD_LOCAL", +
>> SEC_THREAD_LOCAL) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_HAS_GOT_REF", +
>> SEC_HAS_GOT_REF) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_IS_COMMON", +
>> SEC_IS_COMMON) < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_DEBUGGING", + SEC_DEBUGGING)
>> < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_IN_MEMORY", + SEC_IN_MEMORY)
>> < 0 + || PyModule_AddIntConstant (gdb_module, "SEC_EXCLUDE",
>> SEC_EXCLUDE) < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_SORT_ENTRIES", +
>> SEC_SORT_ENTRIES) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_LINK_ONCE", +
>> SEC_LINK_ONCE) < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_LINK_DUPLICATES", +
>> SEC_LINK_DUPLICATES) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_LINK_DUPLICATES_DISCARD", +
>> SEC_LINK_DUPLICATES_DISCARD) < 0 + ||
>> PyModule_AddIntConstant (gdb_module,
>> "SEC_LINK_DUPLICATES_ONE_ONLY", +
>> SEC_LINK_DUPLICATES_ONE_ONLY) < 0 + ||
>> PyModule_AddIntConstant (gdb_module,
>> "SEC_LINK_DUPLICATES_SAME_SIZE", +
>> SEC_LINK_DUPLICATES_SAME_SIZE) < 0 + ||
>> PyModule_AddIntConstant (gdb_module, "SEC_LINKER_CREATED", +
>> SEC_LINKER_CREATED) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_KEEP", SEC_KEEP) < 0 + ||
>> PyModule_AddIntConstant (gdb_module, "SEC_SMALL_DATA", +
>> SEC_SMALL_DATA) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_MERGE", SEC_MERGE) < 0 + ||
>> PyModule_AddIntConstant (gdb_module, "SEC_STRNGS", SEC_STRINGS) <
>> 0 + || PyModule_AddIntConstant (gdb_module, "SEC_GROUP",
>> SEC_GROUP) < 0 + || PyModule_AddIntConstant (gdb_module,
>> "SEC_COFF_SHARED_LIBRARY", +
>> SEC_COFF_SHARED_LIBRARY) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_ELF_REVERSE_COPY", +
>> SEC_ELF_REVERSE_COPY) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_COFF_SHARED", +
>> SEC_COFF_SHARED) < 0 + || PyModule_AddIntConstant
>> (gdb_module, "SEC_COFF_NOREAD", +
>> SEC_COFF_NOREAD) < 0) + return -1; ...
>
- --
Jeff Mahoney
SUSE Labs
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