The .ctors section contains a list of pointers that have to be run
before `main`. It usually contains pointers to global constructors.
The .dtors are for global destructors.
The .init_array and .fini_array serve the same purpose as .ctors and
.dtors. The former sections are newer than the latter sections, and
most programs have already migrated to .{init,fini}_array.
.ctors/.dtors are very similar to .{init,fini}_array, but the order
in which pointers are executed is different. .ctors/.dtors are executed
from the end to the beginning, while .{init,fini}_array are executed
from the beginning to the end.
Previously, we converted .ctors/.dtors sections into .{init,fini}_array
sections. In order to do that, we not only merge .ctors/.dtors to
.{init,fini}_array but also reverse their section contents, so that
the initialization order remains the same.
However, there was a bug in that logic. We forgot to reverse the
locations of dynamic relocations for the converted sections.
So, .ctors/.dtors sections converted to .{init,fini}_array were executed
in a wrong order.
We have two choices to "fix" the issue: (1) reverse not only section
contents but also dynamic relocations, or (2) stop converting .ctors/.dtors.
In this patch, I chose (2).
Since LLVM lld doesn't convert .ctors/.dtors, it shouldn't cause an
issue for most programs.
Previously, mold crashes due to an invalid regex pattern exception
when `[...]` is given as a version script pattern.
Fixes https://github.com/rui314/mold/issues/258
Previously, mold put all global symbols into .gnu.hash. Although I
believe it was not an error, it bloated the size of .gnu.hash because
.gnu.hash needs only exported symbols.
https://github.com/rui314/mold/issues/255
This is very hacky but highly practical, so I couldn't resist to not
implement this. We should support LTO natively in the future. In the
meantime, this feature should work as a poor-man's replacement.
Fixes https://github.com/rui314/mold/issues/242
This makes it possible to build and test mold in a path that contains
whitespace characters - with the notable exception of the tests where
`LD_PRELOAD` is used. That's because `LD_PRELOAD` unconditionally treats
any whitespace as separator, regardless of quoting.
The following ShellCheck warnings are eliminated by this commit:
* SC2046: Quote this to prevent word splitting.
* SC2086: Double quote to prevent globbing and word splitting.
Signed-off-by: Christoph Erhardt <github@sicherha.de>
For globbing, '?' matches a single character, so must be replaced
with '.'. As a result, don't skip the later regex matching for
version scripts, if the pattern contains either '*' or '?'.
Signed-off-by: Jan-Marek Glogowski <glogow@fbihome.de>
Previously, if there are more than one TLS BSS section (e.g. .tbss and
.tcommon), mold layout them in such a way that they overlap in memory.
That caused a mysterious program crash to the programs compiled with DMD,
a D compiler.
Fixes https://github.com/rui314/mold/issues/126
When we are creating a DSO, unresolved undefined symbols are promoted to
dynamic symbols by default so that they will get another chance to be
resolved at runtime.
You can suppress this behavior by passing `-z defs`. If that option is
given, remaining undefs are reported as errors instead of being silently
promoted.
It looks like `-warn-undefined-symbols` negates the effect of `-z defs`.
So, if both options are given, remaining undefs are promoted to dynamic
symbols. mold previously silently make such symbols absolute symbols with
value 0.
Fixed https://github.com/rui314/mold/issues/152
