Great!two issues (on OSX at least):
A)
it seems the top-most element of the call stack gets chopped off; eg in your code, the main_module.main symbol will not appear in the stack trace.
Any idea why or how to fix that?
Is that some inlining issue ? I tried with dmd -g, or -gs or -gc.
This can be annoying when the top-most function is a large function and it's not at all clear where the code stopped.
B)
there are no line numbers. I did a complex workaround by launching a process and calling atos to get those, but isn't there a better way?
On Thu, Jun 6, 2013 at 8:44 AM, nazriel
<spam@dzfl.pl> wrote:
On Wednesday, 5 June 2013 at 21:05:53 UTC, Timothee Cour wrote:
how do i get a stacktrace inside handleTermination?
If not currently possible, could we have a compile flag that would enable
this kind of feature? (making code slower would be OK, its an opt in
feature)
Ideally we'd also be able to walk up or down the stack trace (kind of what
gdb would do, but I'd like to be able to do that without resorting to gdb,
using a language/library solution)
----
import core.sys.posix.signal;
import std.c.stdlib;
import std.stdio;
void main(string[] args)
{
bsd_signal(SIGINT, &handleTermination);
while (true)
{
}
}
extern(C) void handleTermination(int signal)
{
writefln("Caught signal: %s", signal);
exit(signal);
}
-----
Maybe something like this:
http://dpaste.dzfl.pl/99f217be
---
import core.sys.posix.signal;
import std.c.stdlib;
import std.stdio;
import std.conv;
void main(string[] args)
{
bsd_signal(SIGINT, &handleTermination);
while (true)
{
}
}
extern(C) void handleTermination(int signal)
{
writefln("Caught signal: %s", signal);
getTrace();
exit(signal);
}
extern (C) void* thread_stackBottom();
extern (C) char** backtrace_symbols(void**, int size);
void getTrace() {
void*[10] callstack;
void** stackTop;
void** stackBottom = cast(void**) thread_stackBottom();
asm {
mov [stackTop], RBP;
}
auto curr = stackTop;
size_t i;
for (i = 0; stackTop <= curr &&
curr < stackBottom && i < 10;)
{
callstack[i++] = *(curr+1);
curr = cast(void**) *curr;
}
auto ret = backtrace_symbols(callstack.ptr, cast(int) i);
for (; i > 0; i--) {
writeln((*ret).to!string());
ret++;
}
}
---