• d-bugmail puremagic.com (21/27) Jun 13 2018 https://issues.dlang.org/show_bug.cgi?id=18984

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=18984

          Issue ID: 18984
           Summary: Debugging stack struct's which are returned causes
                    incorrect debuginfo.
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P1
         Component: visuald
          Assignee: nobody puremagic.com
          Reporter: turkeyman gmail.com

Created attachment 1704
  --> https://issues.dlang.org/attachment.cgi?id=1704&action=edit
Test case

From the prior conversation:

 Debugging issues:
    Stack allocated struct won't show values correctly (repro project attached)
    Supply metadata0.bin as commandline arg
    Place watch at lines 91 and 119, step and watch the values of `Frame f` and
`Packet p` as they are populated with data
    Notice that those stack structs do not appear to be changing, and show
rubbish values.


You can see the actual value in the hidden return value __HID1/__HID2
(you can see the symbol in the disassembly). dmd seems to ignore RVO
when emitting the debug info.

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