libctf: fix a number of build problems found on Solaris and NetBSD
- Use of nonportable <endian.h>
- Use of qsort_r
- Use of zlib without appropriate magic to pull in the binutils zlib
- Use of off64_t without checking (fixed by dropping the unused fields
that need off64_t entirely)
- signedness problems due to long being too short a type on 32-bit
platforms: ctf_id_t is now 'unsigned long', and CTF_ERR must be
used only for functions that return ctf_id_t
- One lingering use of bzero() and of <sys/errno.h>
All fixed, using code from gnulib where possible.
Relatedly, set cts_size in a couple of places it was missed
(string table and symbol table loading upon ctf_bfdopen()).
binutils/
* objdump.c (make_ctfsect): Drop cts_type, cts_flags, and
cts_offset.
* readelf.c (shdr_to_ctf_sect): Likewise.
include/
* ctf-api.h (ctf_sect_t): Drop cts_type, cts_flags, and cts_offset.
(ctf_id_t): This is now an unsigned type.
(CTF_ERR): Cast it to ctf_id_t. Note that it should only be used
for ctf_id_t-returning functions.
libctf/
* Makefile.am (ZLIB): New.
(ZLIBINC): Likewise.
(AM_CFLAGS): Use them.
(libctf_a_LIBADD): New, for LIBOBJS.
* configure.ac: Check for zlib, endian.h, and qsort_r.
* ctf-endian.h: New, providing htole64 and le64toh.
* swap.h: Code style fixes.
(bswap_identity_64): New.
* qsort_r.c: New, from gnulib (with one added #include).
* ctf-decls.h: New, providing a conditional qsort_r declaration,
and unconditional definitions of MIN and MAX.
* ctf-impl.h: Use it. Do not use <sys/errno.h>.
(ctf_set_errno): Now returns unsigned long.
* ctf-util.c (ctf_set_errno): Adjust here too.
* ctf-archive.c: Use ctf-endian.h.
(ctf_arc_open_by_offset): Use memset, not bzero. Drop cts_type,
cts_flags and cts_offset.
(ctf_arc_write): Drop debugging dependent on the size of off_t.
* ctf-create.c: Provide a definition of roundup if not defined.
(ctf_create): Drop cts_type, cts_flags and cts_offset.
(ctf_add_reftype): Do not check if type IDs are below zero.
(ctf_add_slice): Likewise.
(ctf_add_typedef): Likewise.
(ctf_add_member_offset): Cast error-returning ssize_t's to size_t
when known error-free. Drop CTF_ERR usage for functions returning
int.
(ctf_add_member_encoded): Drop CTF_ERR usage for functions returning
int.
(ctf_add_variable): Likewise.
(enumcmp): Likewise.
(enumadd): Likewise.
(membcmp): Likewise.
(ctf_add_type): Likewise. Cast error-returning ssize_t's to size_t
when known error-free.
* ctf-dump.c (ctf_is_slice): Drop CTF_ERR usage for functions
returning int: use CTF_ERR for functions returning ctf_type_id.
(ctf_dump_label): Likewise.
(ctf_dump_objts): Likewise.
* ctf-labels.c (ctf_label_topmost): Likewise.
(ctf_label_iter): Likewise.
(ctf_label_info): Likewise.
* ctf-lookup.c (ctf_func_args): Likewise.
* ctf-open.c (upgrade_types): Cast to size_t where appropriate.
(ctf_bufopen): Likewise. Use zlib types as needed.
* ctf-types.c (ctf_member_iter): Drop CTF_ERR usage for functions
returning int.
(ctf_enum_iter): Likewise.
(ctf_type_size): Likewise.
(ctf_type_align): Likewise. Cast to size_t where appropriate.
(ctf_type_kind_unsliced): Likewise.
(ctf_type_kind): Likewise.
(ctf_type_encoding): Likewise.
(ctf_member_info): Likewise.
(ctf_array_info): Likewise.
(ctf_enum_value): Likewise.
(ctf_type_rvisit): Likewise.
* ctf-open-bfd.c (ctf_bfdopen): Drop cts_type, cts_flags and
cts_offset.
(ctf_simple_open): Likewise.
(ctf_bfdopen_ctfsect): Likewise. Set cts_size properly.
* Makefile.in: Regenerate.
* aclocal.m4: Likewise.
* config.h: Likewise.
* configure: Likewise.
2019-05-31 11:10:51 +02:00
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2019-05-29 Nick Alcock <nick.alcock@oracle.com>
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* Makefile.am (ZLIB): New.
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(ZLIBINC): Likewise.
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(AM_CFLAGS): Use them.
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(libctf_a_LIBADD): New, for LIBOBJS.
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* configure.ac: Check for zlib, endian.h, and qsort_r.
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* ctf-endian.h: New, providing htole64 and le64toh.
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* swap.h: Code style fixes.
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(bswap_identity_64): New.
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* qsort_r.c: New, from gnulib (with one added #include).
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* ctf-decls.h: New, providing a conditional qsort_r declaration,
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and unconditional definitions of MIN and MAX.
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* ctf-impl.h: Use it. Do not use <sys/errno.h>.
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(ctf_set_errno): Now returns unsigned long.
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* ctf-util.c (ctf_set_errno): Adjust here too.
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* ctf-archive.c: Use ctf-endian.h.
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(ctf_arc_open_by_offset): Use memset, not bzero. Drop cts_type,
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cts_flags and cts_offset.
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(ctf_arc_write): Drop debugging dependent on the size of off_t.
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* ctf-create.c: Provide a definition of roundup if not defined.
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(ctf_create): Drop cts_type, cts_flags and cts_offset.
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(ctf_add_reftype): Do not check if type IDs are below zero.
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(ctf_add_slice): Likewise.
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(ctf_add_typedef): Likewise.
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(ctf_add_member_offset): Cast error-returning ssize_t's to size_t
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when known error-free. Drop CTF_ERR usage for functions returning
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int.
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(ctf_add_member_encoded): Drop CTF_ERR usage for functions returning
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int.
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(ctf_add_variable): Likewise.
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(enumcmp): Likewise.
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(enumadd): Likewise.
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(membcmp): Likewise.
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(ctf_add_type): Likewise. Cast error-returning ssize_t's to size_t
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when known error-free.
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* ctf-dump.c (ctf_is_slice): Drop CTF_ERR usage for functions
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returning int: use CTF_ERR for functions returning ctf_type_id.
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(ctf_dump_label): Likewise.
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(ctf_dump_objts): Likewise.
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* ctf-labels.c (ctf_label_topmost): Likewise.
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(ctf_label_iter): Likewise.
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(ctf_label_info): Likewise.
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* ctf-lookup.c (ctf_func_args): Likewise.
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* ctf-open.c (upgrade_types): Cast to size_t where appropriate.
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(ctf_bufopen): Likewise. Use zlib types as needed.
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* ctf-types.c (ctf_member_iter): Drop CTF_ERR usage for functions
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returning int.
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(ctf_enum_iter): Likewise.
|
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(ctf_type_size): Likewise.
|
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(ctf_type_align): Likewise. Cast to size_t where appropriate.
|
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(ctf_type_kind_unsliced): Likewise.
|
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(ctf_type_kind): Likewise.
|
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(ctf_type_encoding): Likewise.
|
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(ctf_member_info): Likewise.
|
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(ctf_array_info): Likewise.
|
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(ctf_enum_value): Likewise.
|
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(ctf_type_rvisit): Likewise.
|
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* ctf-open-bfd.c (ctf_bfdopen): Drop cts_type, cts_flags and
|
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cts_offset.
|
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(ctf_simple_open): Likewise.
|
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(ctf_bfdopen_ctfsect): Likewise. Set cts_size properly.
|
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* Makefile.in: Regenerate.
|
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* aclocal.m4: Likewise.
|
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* config.h: Likewise.
|
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* configure: Likewise.
|
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2019-05-29 11:11:37 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* configure.in: Check for bfd_section_from_elf_index.
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* configure: Regenerate.
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* config.h.in [HAVE_BFD_ELF]: Likewise.
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* libctf/ctf_open_bfd (ctf_bfdopen_ctfsect): Use it.
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abfd is potentially unused now.
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2019-04-24 12:49:48 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* Makefile.am: New.
|
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* Makefile.in: Regenerated.
|
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* config.h.in: Likewise.
|
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* aclocal.m4: Likewise.
|
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* configure: Likewise.
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2019-04-24 12:41:00 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-dump.c: New.
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2019-04-24 12:35:37 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-labels.c: New.
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2019-04-24 12:26:42 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-impl.h (_libctf_version): New declaration.
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* ctf-subr.c (_libctf_version): Define it.
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(ctf_version): New.
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2019-04-24 12:22:03 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-create.c (enumcmp): New.
|
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(enumadd): Likewise.
|
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(membcmp): Likewise.
|
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(membadd): Likewise.
|
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(ctf_add_type): Likewise.
|
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2019-04-24 12:15:33 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-lookup.c (isqualifier): New.
|
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(ctf_lookup_by_name): Likewise.
|
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(struct ctf_lookup_var_key): Likewise.
|
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(ctf_lookup_var): Likewise.
|
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(ctf_lookup_variable): Likewise.
|
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(ctf_lookup_symbol_name): Likewise.
|
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(ctf_lookup_by_symbol): Likewise.
|
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(ctf_func_info): Likewise.
|
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(ctf_func_args): Likewise.
|
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2019-04-24 12:03:37 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-decl.c: New file.
|
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* ctf-types.c: Likewise.
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* ctf-impl.h: New declarations.
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libctf: ELF file opening via BFD
These functions let you open an ELF file with a customarily-named CTF
section in it, automatically opening the CTF file or archive and
associating the symbol and string tables in the ELF file with the CTF
container, so that you can look up the types of symbols in the ELF file
via ctf_lookup_by_symbol(), and so that strings can be shared between
the ELF file and CTF container, to save space.
It uses BFD machinery to do so. This has now been lightly tested and
seems to work. In particular, if you already have a bfd you can pass
it in to ctf_bfdopen(), and if you want a bfd made for you you can
call ctf_open() or ctf_fdopen(), optionally specifying a target (or
try once without a target and then again with one if you get
ECTF_BFD_AMBIGUOUS back).
We use a forward declaration for the struct bfd in ctf-api.h, so that
ctf-api.h users are not required to pull in <bfd.h>. (This is mostly
for the sake of readelf.)
libctf/
* ctf-open-bfd.c: New file.
* ctf-open.c (ctf_close): New.
* ctf-impl.h: Include bfd.h.
(ctf_file): New members ctf_data_mmapped, ctf_data_mmapped_len.
(ctf_archive_internal): New members ctfi_abfd, ctfi_data,
ctfi_bfd_close.
(ctf_bfdopen_ctfsect): New declaration.
(_CTF_SECTION): likewise.
include/
* ctf-api.h (struct bfd): New forward.
(ctf_fdopen): New.
(ctf_bfdopen): Likewise.
(ctf_open): Likewise.
(ctf_arc_open): Likewise.
2019-04-24 11:46:39 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-open-bfd.c: New file.
|
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* ctf-open.c (ctf_close): New.
|
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* ctf-impl.h: Include bfd.h.
|
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(ctf_file): New members ctf_data_mmapped, ctf_data_mmapped_len.
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(ctf_archive_internal): New members ctfi_abfd, ctfi_data,
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ctfi_bfd_close.
|
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(ctf_bfdopen_ctfsect): New declaration.
|
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(_CTF_SECTION): likewise.
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libctf: mmappable archives
If you need to store a large number of CTF containers somewhere, this
provides a dedicated facility for doing so: an mmappable archive format
like a very simple tar or ar without all the system-dependent format
horrors or need for heavy file copying, with built-in compression of
files above a particular size threshold.
libctf automatically mmap()s uncompressed elements of these archives, or
uncompresses them, as needed. (If the platform does not support mmap(),
copying into dynamically-allocated buffers is used.)
Archive iteration operations are partitioned into raw and non-raw
forms. Raw operations pass thhe raw archive contents to the callback:
non-raw forms open each member with ctf_bufopen() and pass the resulting
ctf_file_t to the iterator instead. This lets you manipulate the raw
data in the archive, or the contents interpreted as a CTF file, as
needed.
It is not yet known whether we will store CTF archives in a linked ELF
object in one of these (akin to debugdata) or whether they'll get one
section per TU plus one parent container for types shared between them.
(In the case of ELF objects with very large numbers of TUs, an archive
of all of them would seem preferable, so we might just use an archive,
and add lzma support so you can assume that .gnu_debugdata and .ctf are
compressed using the same algorithm if both are present.)
To make usage easier, the ctf_archive_t is not the on-disk
representation but an abstraction over both ctf_file_t's and archives of
many ctf_file_t's: users see both CTF archives and raw CTF files as
ctf_archive_t's upon opening, the only difference being that a raw CTF
file has only a single "archive member", named ".ctf" (the default if a
null pointer is passed in as the name). The next commit will make use
of this facility, in addition to providing the public interface to
actually open archives. (In the future, it should be possible to have
all CTF sections in an ELF file appear as an "archive" in the same
fashion.)
This machinery is also used to allow library-internal creators of
ctf_archive_t's (such as the next commit) to stash away an ELF string
and symbol table, so that all opens of members in a given archive will
use them. This lets CTF archives exploit the ELF string and symbol
table just like raw CTF files can.
(All this leads to somewhat confusing type naming. The ctf_archive_t is
a typedef for the opaque internal type, struct ctf_archive_internal: the
non-internal "struct ctf_archive" is the on-disk structure meant for
other libraries manipulating CTF files. It is probably clearest to use
the struct name for struct ctf_archive_internal inside the program, and
the typedef names outside.)
libctf/
* ctf-archive.c: New.
* ctf-impl.h (ctf_archive_internal): New type.
(ctf_arc_open_internal): New declaration.
(ctf_arc_bufopen): Likewise.
(ctf_arc_close_internal): Likewise.
include/
* ctf.h (CTFA_MAGIC): New.
(struct ctf_archive): New.
(struct ctf_archive_modent): Likewise.
* ctf-api.h (ctf_archive_member_f): New.
(ctf_archive_raw_member_f): Likewise.
(ctf_arc_write): Likewise.
(ctf_arc_close): Likewise.
(ctf_arc_open_by_name): Likewise.
(ctf_archive_iter): Likewise.
(ctf_archive_raw_iter): Likewise.
(ctf_get_arc): Likewise.
2019-04-24 12:30:17 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-archive.c: New.
|
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|
* ctf-impl.h (ctf_archive_internal): New type.
|
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(ctf_arc_open_internal): New declaration.
|
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(ctf_arc_bufopen): Likewise.
|
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(ctf_arc_close_internal): Likewise.
|
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|
libctf: opening
This fills in the other half of the opening/creation puzzle: opening of
already-existing CTF files. Such files are always read-only: if you
want to add to a CTF file opened with one of the opening functions in
this file, use ctf_add_type(), in a later commit, to copy appropriate
types into a newly ctf_create()d, writable container.
The lowest-level opening functions are in here: ctf_bufopen(), which
takes ctf_sect_t structures akin to ELF section headers, and
ctf_simple_open(), which can be used if you don't have an entire ELF
section header to work from. Both will malloc() new space for the
buffers only if necessary, will mmap() directly from the file if
requested, and will mprotect() it afterwards to prevent accidental
corruption of the types. These functions are also used by ctf_update()
when converting types in a writable container into read-only types that
can be looked up using the lookup functions (in later commits).
The files are always of the native endianness of the system that created
them: at read time, the endianness of the header magic number is used to
determine whether or not the file needs byte-swapping, and the entire
thing is aggressively byte-swapped.
The agggressive nature of this swapping avoids complicating the rest of
the code with endianness conversions, while the native endianness
introduces no byte-swapping overhead in the common case. (The
endianness-independence code is also much newer than everything else in
this file, and deserves closer scrutiny.)
The accessors at the top of the file are there to transparently support
older versions of the CTF file format, allowing translation from older
formats that have different sizes for the structures in ctf.h:
currently, these older formats are intermingled with the newer ones in
ctf.h: they will probably migrate to a compatibility header in time, to
ease readability. The ctf_set_base() function is split out for the same
reason: when conversion code to a newer format is written, it would need
to malloc() new storage for the entire ctf_file_t if a file format
change causes it to grow, and for that we need ctf_set_base() to be a
separate function.
One pair of linked data structures supported by this file has no
creation code in libctf yet: the data and function object sections read
by init_symtab(). These will probably arrive soon, when the linker comes
to need them. (init_symtab() has hardly been changed since 2009, but if
any code in libctf has rotted over time, this will.)
A few simple accessors are also present that can even be called on
read-only containers because they don't actually modify them, since the
relevant things are not stored in the container but merely change its
operation: ctf_setmodel(), which lets you specify whether a container is
LP64 or not (used to statically determine the sizes of a few types),
ctf_import(), which is the only way to associate a parent container with
a child container, and ctf_setspecific(), which lets the caller
associate an arbitrary pointer with the CTF container for any use. If
the user doesn't call these functions correctly, libctf will misbehave:
this is particularly important for ctf_import(), since a container built
against a given parent container will not be able to resolve types that
depend on types in the parent unless it is ctf_import()ed with a parent
container with the same set of types at the same IDs, or a superset.
Possible future extensions (also noted in the ctf-hash.c file) include
storing a count of things so that we don't need to do one pass over the
CTF file counting everything, and computing a perfect hash at CTF
creation time in some compact form, storing it in the CTF file, and
using it to hash things so we don't need to do a second pass over the
entire CTF file to set up the hashes used to go from names to type IDs.
(There are multiple such hashes, one for each C type namespace: types,
enums, structs, and unions.)
libctf/
* ctf-open.c: New file.
* swap.h: Likewise.
include/
* ctf-api.h (ctf_file_close): New declaration.
(ctf_getdatasect): Likewise.
(ctf_parent_file): Likewise.
(ctf_parent_name): Likewise.
(ctf_parent_name_set): Likewise.
(ctf_import): Likewise.
(ctf_setmodel): Likewise.
(ctf_getmodel): Likewise.
(ctf_setspecific): Likewise.
(ctf_getspecific): Likewise.
2019-04-24 11:17:13 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-open.c: New file.
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* swap.h: Likewise.
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libctf: creation functions
The CTF creation process looks roughly like (error handling elided):
int err;
ctf_file_t *foo = ctf_create (&err);
ctf_id_t type = ctf_add_THING (foo, ...);
ctf_update (foo);
ctf_*write (...);
Some ctf_add_THING functions accept other type IDs as arguments,
depending on the type: cv-quals, pointers, and structure and union
members all take other types as arguments. So do 'slices', which
let you take an existing integral type and recast it as a type
with a different bitness or offset within a byte, for bitfields.
One class of THING is not a type: "variables", which are mappings
of names (in the internal string table) to types. These are mostly
useful when encoding variables that do not appear in a symbol table
but which some external user has some other way to figure out the
address of at runtime (dynamic symbol lookup or querying a VM
interpreter or something).
You can snapshot the creation process at any point: rolling back to a
snapshot deletes all types and variables added since that point.
You can make arbitrary type queries on the CTF container during the
creation process, but you must call ctf_update() first, which
translates the growing dynamic container into a static one (this uses
the CTF opening machinery, added in a later commit), which is quite
expensive. This function must also be called after adding types
and before writing the container out.
Because addition of types involves looking up existing types, we add a
little of the type lookup machinery here, as well: only enough to
look up types in dynamic containers under construction.
libctf/
* ctf-create.c: New file.
* ctf-lookup.c: New file.
include/
* ctf-api.h (zlib.h): New include.
(ctf_sect_t): New.
(ctf_sect_names_t): Likewise.
(ctf_encoding_t): Likewise.
(ctf_membinfo_t): Likewise.
(ctf_arinfo_t): Likewise.
(ctf_funcinfo_t): Likewise.
(ctf_lblinfo_t): Likewise.
(ctf_snapshot_id_t): Likewise.
(CTF_FUNC_VARARG): Likewise.
(ctf_simple_open): Likewise.
(ctf_bufopen): Likewise.
(ctf_create): Likewise.
(ctf_add_array): Likewise.
(ctf_add_const): Likewise.
(ctf_add_enum_encoded): Likewise.
(ctf_add_enum): Likewise.
(ctf_add_float): Likewise.
(ctf_add_forward): Likewise.
(ctf_add_function): Likewise.
(ctf_add_integer): Likewise.
(ctf_add_slice): Likewise.
(ctf_add_pointer): Likewise.
(ctf_add_type): Likewise.
(ctf_add_typedef): Likewise.
(ctf_add_restrict): Likewise.
(ctf_add_struct): Likewise.
(ctf_add_union): Likewise.
(ctf_add_struct_sized): Likewise.
(ctf_add_union_sized): Likewise.
(ctf_add_volatile): Likewise.
(ctf_add_enumerator): Likewise.
(ctf_add_member): Likewise.
(ctf_add_member_offset): Likewise.
(ctf_add_member_encoded): Likewise.
(ctf_add_variable): Likewise.
(ctf_set_array): Likewise.
(ctf_update): Likewise.
(ctf_snapshot): Likewise.
(ctf_rollback): Likewise.
(ctf_discard): Likewise.
(ctf_write): Likewise.
(ctf_gzwrite): Likewise.
(ctf_compress_write): Likewise.
2019-04-23 23:45:46 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-create.c: New file.
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* ctf-lookup.c: New file.
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2019-04-23 23:24:13 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-impl.h: New definitions and declarations for type creation
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and lookup.
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2019-04-23 23:12:16 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-hash.c: New file.
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* ctf-impl.h: New declarations.
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2019-04-23 23:05:52 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-error.c: New file.
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2019-04-23 22:45:30 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-util.c: New file.
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* elf.h: Likewise.
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* ctf-impl.h: Include it, and add declarations.
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2019-04-23 19:55:27 +02:00
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2019-05-28 Nick Alcock <nick.alcock@oracle.com>
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* ctf-impl.h: New file.
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* ctf-subr.c: New file.
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Local Variables:
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mode: change-log
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left-margin: 8
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fill-column: 76
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version-control: never
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End:
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