On Thu, 2 Aug 2018, Martin Storsjö wrote:
On Thu, 2 Aug 2018, Liu Hao wrote:
在 2018/8/2 19:02, Martin Storsjö 写道:
-#ifdef __clang__
extern func_ptr __CTOR_END__[];
extern func_ptr __DTOR_END__[];
void __do_global_ctors (void)
{
static func_ptr *p = __CTOR_END__ - 1;
+ // If the linker provided its own __CTOR_LIST__ in addition to the one
+ // we provide, we'd actually stop at __CTOR_LIST__+1, but that's no
problem
+ // for this function.
while (*p != (func_ptr) -1) {
(*(p))();
At the very firsts iteration, isn't `*p` null if there are two null
termini in the list?
(i.e. the list looks like `-1, -1, ... some `func_ptr`s ... , 0, 0`)
I thought the same; that's why I did the extra check with "if (*p)", as I
mentioned in the other mail.
However, in practice, __CTOR_END__ points to the first 0-terminator. Not
sure why that is, but you can check with -Wl,-Map,map.txt.
But yes, it's safer with that extra check added, then both iterations
should be fine, regardless which one the symbol points to, in both ends.
This is because it seems like GNU LD actually never provides any
__CTOR_END__ symbol. But we can have the extra check in any case, for
safety and symmetry.
// Martin
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