• d-bugmail puremagic.com (30/30) May 08 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8068
• d-bugmail puremagic.com (57/57) May 17 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8068

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8068

           Summary: Segmentation fault in std.string.format()
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody puremagic.com
        ReportedBy: pablofst gmail.com



This segmentation fault happens when format is called with 6 consecutive
numbers followed by an string.  It only occurs on 64bit platforms, on 32 it
works as expected.
The minimal example is as follows:

  1 import std.string;
  2 import std.stdio;
  3 
  4 void main() {
  5     string a = format("%d %d %d %d %d %d %s", 1,2,3,4,5,6,"string");
  6     writeln(a);
  7 }
  8 

Regards!
Pablo

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8068


Ali Cehreli <acehreli yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |acehreli yahoo.com



With dmd 2.059 64-bit, I get a "segmentation fault" even though none of the
format() calls have 6 items. There are three layers of structs in the following
code: Outer, Inner, InnerMost:

import std.stdio;
import std.string;

struct InnerMost
{
    int m0;
    int m1;

    string toString()
    {
        return format("%s %s", m0, m1);
    }
}

struct Inner
{
    string m0;
    int m1;
    InnerMost m2;
    InnerMost m3;

    string toString() const
    {
        return format("%s %s %s %s", m0, m1, m2, m3);
    }
}

struct Outer
{
    Inner m0;

    string toString() const
    {
        return format("%s", m0);
    }
}

void main()
{
    auto im0 = InnerMost(0, 0);
    auto im1 = InnerMost(1, 1);
    auto i = Inner("hello", 42, im0, im1);
    auto o = Outer(i);

    o.toString();
}

When built with -m32, there is no bug.

Also, when I replace the first two lines of main with the default
initializations:

    auto im0 = InnerMost();
    auto im1 = InnerMost();

This time I get "null this" similar to bug 6576.

Ali

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