On Thursday, 26 January 2017 at 07:27:13 UTC, Stefan Koch wrote:
On Wednesday, 25 January 2017 at 12:36:02 UTC, Stefan Koch
wrote:
newCTFE is green now on all platforms!
I just found an interesting bug just now.
The following code would cause newCTFE to segfault.
char* initPtr()
{
return cast(char*) size_t.max;
}
static assert(cast(size_t)initPtr() == size_t.max);
Because it would try to return the char-value at heap-address
size_t.max;
newCTFE allocates a 16MB heap by default and therefore the
address was hopelessly out-of-bounds.
The reason this was not detected before is because:
`cast(char*) size_t.max;`
does not actually produce a cast expression.
But rather an IntegerLiteral with the type char*.
After dealing with dmd for 7 months, I could figure out this
bug in a day.
If I had run into this earlier I would have been stuck for
weeks :)
I do not understand why it should dereference the pointer? Do you
mean that the bug was that newCTFE dereferenced but it shouldn't
or that oldCTFE didn't dereference but it should have?
