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digitalmars.D.bugs - [Issue 2931] New: Initialization struct with array from another struct

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2931

           Summary: Initialization struct with array from another struct
           Product: D
           Version: 1.042
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: mihail.zenkov gmail.com


This example work fine:

import std.stdio: writefln;

struct D2 {
        double val[2];
}

void main() {

D2 p = { 1 };
double zoom = 2;
double move = 3;
double scale = 4;

writefln("p.val[0]=", p.val[0]);
writefln("p.val[1]=", p.val[1]);
writefln("zoom=", zoom);
writefln("move=", move);
writefln("scale=", scale);
}

and return:

p.val[0]=1
p.val[1]=1
zoom=2
move=3
scale=4

But if i try same in struct:

import std.stdio: writefln;

struct D2 {
        double val[2];
}

struct view {
        D2 p = { 1 };
        double zoom = 2;
        double move = 3;
        double scale = 4;
}

void main() {
        view v;
        writefln("p.val[0]=", v.p.val[0]);
        writefln("p.val[1]=", v.p.val[1]);
        writefln("zoom=", v.zoom);
        writefln("move=", v.move);
        writefln("scale=", v.scale);
}

i have:

p.val[0]=1
p.val[1]=nan
zoom=nan
move=2
scale=3


--
May 03 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2931


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch



Here's a reduced test case. The fact that the static assert passes shows that
it's not a front-end bug. The bug only happens when an array is
block-initialized.
--------
struct Bug2931 {
        int val[3][4];
}

struct Outer2931 {
        Bug2931 p = Bug2931(67);  // Applies to struct static initializers too
        int zoom = 2;
        int move = 3;
        int scale = 4;
}

int bug2931()
{
  Outer2931 v;
  assert(v.move==3);
  return v.zoom;
}

static assert(bug2931()==2);

void main() {
    assert(bug2931()==2);
}

CAUSE:
todt.c, StructLiteralExp::toDt() contains code which seems to be completely
erroneous. It duplicates the array initializer multiple times. The test suite
still passes when it is removed.

PATCH: todt.c, Line 690, in svn 589.

            if (v->offset < offset)
                error("duplicate union initialization for %s", v->toChars());
            else
            {   unsigned sz = dt_size(d);
                unsigned vsz = v->type->size();
                unsigned voffset = v->offset;
                assert(sz <= vsz);
-                unsigned dim = 1;
-                for (Type *vt = v->type->toBasetype();
-                     vt->ty == Tsarray;
-                     vt = vt->nextOf()->toBasetype())
-                {   TypeSArray *tsa = (TypeSArray *)vt;
-                    dim *= tsa->dim->toInteger();
-                }
-                for (size_t i = 0; i < dim; i++)
-                {
                    if (offset < voffset)
                        pdt = dtnzeros(pdt, voffset - offset);
                    if (!d)
                    {
                        if (v->init)
                            d = v->init->toDt();
                        else
                            v->type->toDt(&d);
                    }
                    pdt = dtcat(pdt, d);
                    d = NULL;
                    offset = voffset + sz;
                    voffset += vsz / dim;
                    if (sz == vsz)
                        break;
-                }

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Jul 28 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2931


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla digitalmars.com



20:34:54 PDT ---
The problem is that the rest of the array is filled in with the array
initializer, rather than the element initializer. This overflows the array.

http://www.dsource.org/projects/dmd/changeset/602

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Aug 05 2010
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2931


Lars T. Kyllingstad <bugzilla kyllingen.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla kyllingen.net
         Resolution|                            |FIXED



01:47:24 PDT ---
Fixed DMD 2.048

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Aug 13 2010