win32 missing linfo lookup

[vtjnash]

It's missing type info. This would be a regression in backtrace quality on win32 which is still somewhat widely used.

#17179 (comment)

[tkelman]

example comparison at #10595 (comment)

[tkelman]

care to elaborate on how far you got? kinda sucks to have backtraces contain less information on 32 bit

[vtjnash]

decided not to work on it as it seemed annoying and low value.

[tkelman]

any breadcrumbs for how this might be fixed then? win32 is the 4th most widely used platform for julia, by a large margin over the 5th.

[vtjnash]

the basic idea would be to go through the symbol list and find the address of closest one, similar to

julia/src/codegen.cpp

Line 1205 in f5764ac

static uint64_t compute_obj_symsize(const object::ObjectFile *obj, uint64_t offset)

but returning lo instead of hi - lo (this is probably essentially what the dlsym call is doing)

(that logic would be added as another option for computing saddr @

julia/src/debuginfo.cpp

Line 1124 in f5764ac

if (saddr) {

)