mirror of
git://sourceware.org/git/libabigail.git
synced 2024-12-14 22:14:35 +00:00
1392a720a8
5 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Dodji Seketeli
|
b1b0586dc2 |
dwarf-reader: Fix bloom filter access in GNU_HASH section
The bloom filter of the GNU_HASH section of binaries is made of words (bitmasks) that are either 32-bits for ELFCLASS32 binaries or 64-bits for ELFCLASS64 binaries. By using the GElf_Word type to hold the content of each bitmask we assume the bitmask to be of a size of at most 'sizeof(Elf64_Word)'. Unfortunately, the name Elf64_Word is a bit misleading because it's a 32-bits wide type (uint32_t). That type is thus too short to hold an entire bitmask for 64-bits binaries. I won't give too many details here about how the bloom filter works as it's described in details in the documentation for the GNU_HASH section at http://www.linker-aliens.org/blogs/ali/entry/gnu_hash_elf_sections/. Suffice it to say that in practise, we were comparing the least significant bytes of a 64-bits bloom bitmask to a 32-bits value. Depending on if we read those least significant bytes on a big or little endian, we obviously don't get the same result. Hence the recent buid breakage at https://builder.wildebeest.org/buildbot/#builders/14/builds/352 where the runtestlookupsyms test fails. This patch thus changes the code of lookup_symbol_from_gnu_hash_tab to use a 64-bits type to hold the value of the bloom bitmask. That way, we never have any information loss. The function bloom_word_at is also changed to read the bloom bitmask as a 64-bits value when looking at an ELFCLASS64 binary and to always return a 64-bits value. It also adds a test to access the bloom filter of an ELFCLASS32 binary. * src/abg-dwarf-reader.cc (bloom_word_at): Properly read an element from the bloom bitmasks array of 32-bits values as a 64-bits value in a portable way. Always return a 64 bits value. (lookup_symbol_from_gnu_hash_tab): Use a 64-bits value to store the bloom bitmask. * tests/data/test-lookup-syms/test1-32bits.so: New test input, compiled as a 32bits binary to test for ELFCLASS32 binaries. * tests/data/test-lookup-syms/test1.c.compiling.txt: Documentation about how to compile the test1[-21bits].so files. * tests/data/Makefile.am: Add the new test material above to source distribution. * tests/test-lookup-syms.cc (in_out_specs): Add the test1-32bits.so test case to this test harness. Signed-off-by: Dodji Seketeli <dodji@redhat.com> |
||
Giuliano Procida
|
aadbd8cdbf |
abisym: Remove leading space in output.
When abisym reports a symbol as found, it currently emits a leading space. It does not do this when reporting a symbol as not found. This patch removes the leading space. * tools/abisym.cc (main): Remove leading space from output. * tests/data/test-lookup-syms/test0-report.txt: Remove leading space from expected output. * tests/data/test-lookup-syms/test01-report.txt: Ditto. * tests/data/test-lookup-syms/test02-report.txt: Ditto. * tests/data/test-lookup-syms/test1-1-report.txt: Ditto. Signed-off-by: Giuliano Procida <gprocida@google.com> Signed-off-by: Dodji Seketeli <dodji@redhat.com> |
||
|
Dodji Seketeli
|
3567c0fe12 |
Re-build a test input file with debug info
* tests/data/test-lookup-syms/test1.so: Rebuild this with debug info. Signed-off-by: Dodji Seketeli <dodji@redhat.com> |
||
|
Dodji Seketeli
|
ce1278c3da |
Initial support for elf symbol (versionning) during decl comparison
* include/abg-fwd.h (get_linkage_name): Remove.
* include/abg-dwarf-reader.h (enum symbol_type)
(enum symbol_binding): Move these into abg-ir.h.
(lookup_symbol_from_elf, lookup_public_function_symbol_from_elf):
Adjust.
* src/abg-dwarf-reader.cc (eval_last_constant_dwarf_sub_expr):
Declare this before using it.
(die_address_attribute, die_location_address)
(stt_to_elf_symbol_type, stb_to_elf_symbol_binding)
(find_hash_table_section_index, find_symbol_table_section)
(find_symbol_table_section_index, find_text_section)
(find_bss_section, compare_symbol_name)
(get_symbol_versionning_sections get_version_for_symbol)
(lookup_symbol_from_sysv_hash_tab)
(lookup_symbol_from_gnu_hash_tab, get_elf_class_size_in_bytes)
(bloom_word_at, setup_gnu_ht, lookup_symbol_from_elf_hash_tab)
(lookup_symbol_from_symtab, maybe_adjust_fn_sym_address)
(maybe_adjust_var_sym_address): New static functions.
(enum hash_table_kind): New enum.
(struct gnu_ht): New struct.
(read_context::var_decls_to_add_): Renamed var_decls_to_add into
this.
(read_context::{fun, var}_sym_addr_sym_index_map_): New member.
(read_context::{lookup_symbol_from_elf,
lookup_elf_symbol_from_index, lookup_elf_fn_symbol_from_address,
lookup_elf_var_symbol_from_address, fun_sym_addr_sym_index_map,
var_sym_addr_sym_index_map, load_symbol_addr_to_index_maps,
get_function_address, get_variable_address}): New member
functions.
(read_context::lookup_public_{variable,
function}_symbol_from_elf): Adjust.
(op_pushes_constant_value): Fix a bug here.
(lookup_symbol_from_elf): Adjust. Support cases where there is no
elf hash table, e.g, for relocatable files.
(lookup_public_function_symbol_from_elf)
(lookup_public_variable_symbol_from_elf): Adjust.
(build_var_decl): Allow updating the var_decl to associate it with
its underlying symbol. In that case, if the linkage name is not
set, set it to the symbol name.
(build_function_decl): Likewise for function_decl.
(operator<<(std::ostream&, symbol_type)):
(operator<<(std::ostream&, symbol_binding)): Move these do
abg-ir.cc.
* include/abg-ir.h (class elf_symbol): Declare new class. Move
enum symbol_binding and enum symbol_type (from abg-dwarf-reader.h) to
elf_symbol::binding and elf_symbol::type here.
(operator<<(std::ostream&, elf_symbol::type))
(operator<<(std::ostream&, elf_symbol::binding))
(operator==(const elf_symbol_sptr, const elf_symbol_sptr)): New
operators.
(class elf_symbol::version): Declare new class.
(class var_decl): Make this pimpl, and add ...
(var_decl::{g,s}et_symbol): ... new member functions.
(class function_decl): Likewise, make this pimpl and add ...
(function_decl::{g,s}et_symbol): ... new member functions.
* src/abg-ir.cc (struct elf_symbol, elf_symbol::priv): New
types.
(elf_symbol::*): Lots of new members and member functions.
(operator==(const elf_symbol_sptr, const elf_symbol_sptr)): New.
(operator<<(std::ostream&, elf_symbol::type)): New.
(operator<<(std::ostream&, elf_symbol::binding)): New.
(elf_symbol::version::priv): New type.
(elf_symbol::version::*): Lots of member functions.
(get_linkage_name): Removed.
(var_decl::priv): New type. Pimplify the thing.
(var_decl::{s,g}et_symbol): New.
(var_decl::operator==): Take symbols in account in the comparison.
(function_decl::priv): New type.
(function_decl::*): Pimplify.
(function_decl::{s,g}et_symbol): New.
(function_decl::operator==): Take symbols in account in the
comparison.
* include/abg-comparison.h (diff_context::show_linkage_name): New
member function.
* src/abg-comparison.cc (diff_context::priv::show_linkage_name_):
New member.
(diff_context::priv::priv): Initialize it.
(diff_context::show_linkage_names): New member function.
(corpus_diff::report): If the user used --show-linkage-names,
display the linkage name after the name of the functions. Add
missing "'" in the some spots.
* tools/bidiff.cc (options.show_linkage_names): New member.
(display_usage, parse_command_line): Support --linkage-names.
* tools/bisym.cc (show_help): Add '\n' at the end of help string
for --demangle. Add --no-absolute-path option.
(parse_command_line): Support --no-absolute-path.
(main): Adjust for symbol (versionning) support. Consider that
the program successfully completed even when the symbol wasn't
found. Support --no-absolute-path.
* tests/data/test-lookup-syms/test0-report.txt: New.
* tests/data/test-lookup-syms/test01-report.txt: New.
* tests/data/test-lookup-syms/test02-report.txt: New.
* tests/data/test-read-dwarf/test0.abi: Adjust.
* tests/data/test-read-dwarf/test1.abi: Adjust.
* tests/data/test-diff-dwarf/test7-report.txt: Adjust.
* tests/data/test-diff-filter/test10-report.txt: Adjust.
* tests/data/test-diff-filter/test12-report.txt: Adjust.
* tests/data/test-lookup-syms/test1-[123]-report.txt: New.
* tests/data/test-lookup-syms/test1.c: New.
* tests/data/test-lookup-syms/test1.version-script: New.
* tests/test-lookup-syms.cc: Adjust for new tests.
* test/Makefile.am: Adjust makefile.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
|
||
|
Dodji Seketeli
|
12c777681d |
Support symbol lookups from ELF
* include/abg-dwarf-reader.h (symbol_type, symbol_binding): New
enums.
(operator<<): Declare new overloads for the new enums above.
(lookup_symbol_from_elf, lookup_public_function_symbol_from_elf):
Declare new entry points.
* src/abg-dwarf-reader.cc (lookup_symbol_from_elf)
(lookup_public_function_symbol_from_elf)
(lookup_public_variable_symbol_from_elf): Define new static
functions.
(read_context::elf_{module_, handle}_): New data members.
(read_context::{elf_module, elf_handle}): New accessors.
(read_context::load_debug_info): Store the elf module into
read_context::_elf_module_. Adjust.
(read_context::{lookup_symbol_from_elf,
lookup_public_function_symbol_from_elf,
lookup_public_variable_symbol_from_elf}): New member functions.
(lookup_symbol_from_elf, lookup_public_function_symbol_from_elf)
(operator<<): Define public entry points.
* tools/bisym.cc: New tool to lookup a symbol in an elf file.
* tools/Makefile.am: Add the bisym.cc source file to the
distribution and arrange to compile it into a 'bisym' executable.
* tests/test-lookup-syms.cc: New test harness.
* tests/data/test-lookup-syms/test0-report.txt: New test input
for the harness above.
* tests/data/test-lookup-syms/test0.cc: Likewise.
* tests/data/test-lookup-syms/test0.o: Likewise
* tests/data/test-lookup-syms/test01-report.txt: Likewise.
* tests/data/test-lookup-syms/test02-report.txt: Likewise.
* tests/Makefile.am: Build the new runtestlookupsyms test and add
the new files to the distribution.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
|