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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the basis of base addresses comparison.
* addr2line.c: use uintptr_t instead of intptr_t for poinrters.
* addr2line.c (rb_dump_backtrace_with_lines): don't use syms.
* vm_dump.c (rb_print_backtrace): ditto.
* addr2line.h: ditto.
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be a function in the main executable, whose absolute path is not
available by dladdr, and ruby get it by /proc/self/exe on Linux.
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because DWARF's line_Base is signed char and char maybe unsigned.
patched by Rei Odaira. [ruby-dev:48068] [Bug #9654]
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address. Therefore noreturn function with tail call's return
address may be in another function.
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symbol table if it is built with cc -g and not stripped.
Now ruby can show static symbols on Linux though glibc's
backtrace_symbols(3) don't show them.
* addr2line.c (rb_dump_backtrace_with_lines): use dladdr(3) to
detect what object file declares the symbol because
dl_iterate_phdr can't detect the main executable file
and codes on the stack.
NOTE: signal trampolines sometimes on the user stack. (FreeBSD)
* addr2line.c (rb_dump_backtrace_with_lines): stop showing
backtrace if the function's name is main.
NOTE: FreeBSD's backtrace (libexecinfo) shows _start and
an additional address. Why it doesn't remove them on dladdr phase
is, dladdr may fail to detect the main function but detect
as _start function. Therefore it must be after scanning
the symbol table and getting correct name.
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* addr2line.c (fill_lines): show the line number in C backtrace if
ruby is built without --enable-shared (PIE) on Linux.
patch is originally by Shinichiro Hamaji
https://twitter.com/shinh/status/441957774264504321
NOTE: ld doesn't insert __executable_start for PIE.
dladdr(3)'s argument must be a function pointer.
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__inline is not available with old compilers on Solaris.
[ruby-dev:47229] [Bug #8227]
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this is consided as async signal safe function.
* addr2line.c (rb_dump_backtrace_with_lines): use kfprintf.
[Bug #8144] [ruby-core:53632]
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* include/ruby/ruby.h (alloca), eval_intern.h (alloca), gc.c
(alloca): Make alloca() globally available by moving the
ultimate ifdef's to ruby/ruby.h. Gcc hides its builtin alloca()
when compiling with -ansi, and linking thus fails on platforms
that lack their own alloca() implementation in libc, which
include OpenBSD and some ports of NetBSD. We use alloca()
everywhere including from within third party C extentions, so
alloca() must be made globally available. [Bug #7307]
* addr2line.c (alloca): Replace the alloca() part with the
ultimate ifdef's. [Bug #7307]
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* addr2line.c (fill_lines): check file size overflow only if it is
necessary, and suppress a sign-compare warning.
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target binary because there are some platforms which off_t > size_t.
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this tmp1 is not required after r35538.
* addr2line.c: suppress warnings.
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because the index specifies the index of given included_directories
which is separated by NUL and its index is begun from 1.
Note that 0 specifies the current directory of the compilation.
see also http://www.dwarfstd.org/doc/dwarf-2.0.0.pdf
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A user of distribution provided ruby will see line
info if s/he has a debug package for ruby.
patched by Shinichiro Hamaji [ruby-dev:42655]
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To ignore, it needs to read a sigle unsigned LEB128 integer.
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functions in backtrace. [ruby-dev:42625]
a patch from shinichiro.h <shinichiro.hamaji AT gmail.com>
* addr2line.h: ditto.
* common.mk: add addr2line.$(OBJEXT).
* configure.in: check dl_iterate_phdr.
* vm_dump.c (rb_vm_bugreport): use rb_dump_backtrace_with_lines in
addr2line.c when the binary is ELF.
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