I recently discovered that my exceptions do not show a trace anymore.
How can this happen?

int main() {
  try {
    throw new Exception("test");
  } catch(Throwable e) {
    writefln("trace: %s", e.info);
  }
  // ...
}

I'm expecting something like this:

trace: 0x00402326
0x0040E337
0x0040E2B1
0x0040E14C
0x0040A1D2
0x0040236B
0x76466359 in BaseThreadInitThunk
0x77CA7B74 in RtlGetAppContainerNamedObjectPath
0x77CA7B44 in RtlGetAppContainerNamedObjectPath

but it just prints: "trace:" and continues normally (does not terminate).
The e.info contains a core.sys.windows.stacktrace.StackTrace but it seems empty.

I cannot reproduce it with a standalone example app - everything works as expected there. But not in my application. Anyone ever experienced this?

On Saturday, 24 July 2021 at 08:41:20 UTC, frame wrote:

Meanwhile I can, it seems a linking problem or I'm doing something wrong? Please consider:

// dmd -m64 -L/DLL -version=lib test.d -of=common.dll
// dmd -m64 test.d

// test.d
version (lib)
{
    import core.sys.windows.dll;
    import std.stdio;

    mixin SimpleDllMain;

    export extern (C) void test()
    {
        writeln("test() called");
    }
}
else
{
    import std.stdio;

    pragma(lib, "common.lib");
    extern (C) void test();

    void main()
    {
        // No trace info anymore if extern function is called
        // test();

        try
        {
            throw new Exception("test");
        }
        catch (Throwable e)
        {
            writeln("trace: ", e.info);
            writeln("whatever");
        }
    }
}

On Saturday, 24 July 2021 at 08:41:20 UTC, frame wrote:

It needs to load the .pdb file at runtime, so make sure it stays next to your exe.

On Sunday, 25 July 2021 at 10:26:34 UTC, Adam D Ruppe wrote:

No, I think you misunderstand the issue. I don't care about the symbolic debug information.

The issue is: w/o calling test() there are stack lines available but when I compile it with the test() call, no stack lines are available?

On Sunday, 25 July 2021 at 11:17:26 UTC, frame wrote:

So if my usage is valid I would file a bug report - but maybe my setup is just broken.
Could some Windows user please verify this issue with static linked?

try
{
   throw new Exception("test");
}
catch (Throwable e)
{
   const(char)[] lines;
   foreach (n; e.info) lines ~= n;
   assert(lines.length == 0); // true if test() call was compiled in
}

On Tuesday, 27 July 2021 at 05:14:22 UTC, frame wrote:

No further response to this, so I made a ticket:
https://issues.dlang.org/show_bug.cgi?id=22181