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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