Though DWARF specifies "the applicable base address defaults to the base
address of the compilation unit", but GCC seems to use zero as default.
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../addr2line.c: In function ‘fill_lines’:
../addr2line.c:709:8: warning: ‘file’ may be used uninitialized in this function [-Wmaybe-uninitialized]
if (file != NULL) {
^
../addr2line.c:535:11: warning: ‘filesize’ may be used uninitialized in this function [-Wmaybe-uninitialized]
off_t filesize;
^~~~~~~~
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FreeBSD 11.0 unfortunately lacks ELF compression definitions in their
elf.h (sys/elf_common.h), and 11.1 introduced them.
b9167d33a1
Though we can add workaround, we simply drop support because
FreeBSD 11.0 is already EOL at November 30, 2017.
https://www.freebsd.org/security/unsupported.html
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POSIX mmap(3) manpage stipulates mmap bumps the reference
count of the file description. Thus keeping a file descriptor
to maintain the reference is not necessary.
If this didn't work, every extension .so would require a
permanent FD, which is obviously not the case.
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* addr2line.c: Because stdbool.h is a C99 feature, compile error
occurs with some old compilers without specifying C99 options.
Fix compile error with Oracle Solaris Studio 12.4 on Solaris 10.
[Bug #14200] [ruby-dev:50366]
* missing/stdbool.h: Alternative of stdbool.h for C89 compilers.
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SHF_COMPRESSED was not defined until glibc 2.22, and there are
older distros (e.g. Debian 8.x jessie) which do not have this
defined.
Perhaps it is safe to define SHF_COMPRESSED to (1 << 11) ourselves,
too, since ELF should be a standardized format.
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To identify the line of backtrace with ease, show the offset address of library.
You can just find the source filename and the line with
`addr2line -e libruby.so.2.5.0 0xXXXX`
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* addr2line.c (follow_debuglink): insert global_debug_dir by using
memmove instead of copying to temporary buffer.
* dln.c (dln_load): use memcpy with the known length instead of
strcpy.
* gc.c (rb_gc_unprotect_logging): use strdup instead of malloc and
strcpy.
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more than two decades ago. [fix GH-1350] Patch by @cremno
* include/ruby/ruby.h: ditto.
* io.c: ditto.
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with dladdr_fbases introduced at r45563.
it didn't get before if the executalbe is not pie.
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At least sh, csh, tcsh, bash, and zsh sets realpath of the main
executable for dladdr, but gdb doesn't.
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which is retrived from dladdr to dladdr_fbases, to skip already
parsed objects.
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symbol '_start'.
* addr2line.c (fill_lines): instead of above, get a dynamic symbol
in the main executable and use it to know the base address.
* addr2line.c (follow_debuglink0): use obj_info_t instead of
line_info_t to handle object related data.
* addr2line.c (main_exe_path): defined for Linux.
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.symtab section exists, the section's type can be SHT_NOBITS and
actual data doesn't exist in the file. [Bug #9654]
revert r45441.
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fc18 powerpc64's libc6-dbg has symtab/strtab but it can't be
referenced. therefore add workaround not to see them.
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