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.
// Martin
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