22-Mar-2013 11:26, Jacob Carlborg пишет:
On 2013-03-21 22:46, Iain Buclaw wrote:
On 21 March 2013 20:29, Jacob Carlborg <[email protected]
<mailto:[email protected]>> wrote:
The code below works fine without optimizations. But with
optimizations (the -O flag) turned on it segfaults. The behavior
with optimizations turned on is a bit different depending on which
version of DMD I try and if I compile for 32 or 64bit.
DMD 2.062 64bit: Segfault
DMD 2.062 32bit: Prints a huge array then segfault
DMD 2.061 64bit: Segfault
DMD 2.061 32bit: Prints a fairly small array (10 elements) with
random numbers
DMD head (7dcc72a997) 32bit: Bus error: 10
I'm using Mac OS X 10.8.2.
import std.stdio;
int[]* getDeserializedSlice ()
{
void[] a = [1, 2, 3, 4, 5].dup;
auto b = &a;
if (auto c = b)
auto d = &(cast(int[]) *c)[1 .. 1 + 2];
return null;
}
void main ()
{
writeln(*getDeserializedSlice(__));
}
Is the above code supposed to work? The test case might look a bit
strange, the full source code is here:
https://github.com/jacob-__carlborg/orange/blob/master/__orange/serialization/__Serializer.d#L1672
<https://github.com/jacob-carlborg/orange/blob/master/orange/serialization/Serializer.d#L1672>
--
/Jacob Carlborg
Crap, that example was incorrect, it should look like this:
return &(cast(int[]) *c)[1 .. 1 + 2];
OK so c points to [1, 2, 3, 4, 5] (and who knows if it's 5 bytes or 5
ints) slice. *c is that slice, (cast(int[])*c)[1..3] is pieces of that
slice an r-value.
Mmm so you are returning a pointer to r-value (a local temporary)?
What's the point of the code?
--
Dmitry Olshansky
