Hi, I'm trying to compile the r17057 on FreeBSD x86_64 and I'm getting this
error:
fpc/rtl/units/x86_64-freebsd/cpu.s:40: Error: no such instruction: `cmpxchg16b
(%r8)
Any hint?
___
fpc-devel maillist - fpc-devel@lists.freepascal.org
Hi, I'm trying to compile the r17057 on FreeBSD x86_64 and I'm getting this
error:
fpc/rtl/units/x86_64-freebsd/cpu.s:40: Error: no such instruction: `cmpxchg16b
(%r8)
Any hint?
___
fpc-devel maillist - fpc-devel@lists.freepascal.org
Hello, FPC developers' list.
I noticed today that if I want to allocate 0 bytes I get not a nil but a
valid pointer. Why?
This is incompatible with delphi. And I suppose cause crashes and memory
leaks not only in my delphi code which I'm porting to FPC/Lazarus.
--
Best regards,
Paul
On Tue, 1 Mar 2011, Paul Ishenin wrote:
Hello, FPC developers' list.
I noticed today that if I want to allocate 0 bytes I get not a nil but a
valid pointer. Why?
This is incompatible with delphi. And I suppose cause crashes and memory
leaks not only in my delphi code which I'm porting to
On Tue, Mar 1, 2011 at 1:20 PM, Michael Van Canneyt
mich...@freepascal.org wrote:
Does it say in the Delphi docs that Nil is returned if Size=0 ?
Not in the online ones:
http://docwiki.embarcadero.com/VCL/en/System.GetMem
--
Felipe Monteiro de Carvalho
On 01 Mar 2011, at 07:32, Paul Ishenin wrote:
I noticed today that if I want to allocate 0 bytes I get not a nil
but a valid pointer. Why?
The current code that causes this comes from this (cvs) revision:
revision 1.16
date: 1999-09-17 19:14:12 +0200; author: peter; state: Exp; lines:
01.03.2011 19:20, Michael Van Canneyt wrote:
Well, in all these years, you're the first to notice, so I'm not
inclined to think it is a big problem.
Does it say in the Delphi docs that Nil is returned if Size=0 ?
I don't know but a simple test shows this.
Best regards,
Paul Ishenin
01.03.2011 19:29, Jonas Maebe wrote:
That sounds very much like badly written code.
For simplicity we had the next code:
GetMem(SomeArray, Count * SizeOf(ArrayCell))
if SomeArray nil then DoSomeLogic;
Best regards,
Paul Ishenin
___
fpc-devel
Jonas Maebe пишет:
On 01 Mar 2011, at 07:32, Paul Ishenin wrote:
I noticed today that if I want to allocate 0 bytes I get not a nil but
a valid pointer. Why?
The current code that causes this comes from this (cvs) revision:
revision 1.16
date: 1999-09-17 19:14:12 +0200; author: peter;
Paul Ishenin schrieb:
I noticed today that if I want to allocate 0 bytes I get not a nil but a
valid pointer. Why?
This will allow for a following Realloc.
Even in Delphi the behaviour may be subject to the installed memory manager.
DoDi
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On 01 Mar 2011, at 15:25, Sergei Gorelkin wrote:
Jonas Maebe пишет:
a) give a run time error if someone tries to do freemem(nil)
Delphi allows freemem(nil) without error, consistent with TObject.Free
I don't think TObject.Free and freemem are really comparable. TObject.Free is
much more
Paul Ishenin wrote:
01.03.2011 19:29, Jonas Maebe wrote:
That sounds very much like badly written code.
For simplicity we had the next code:
GetMem(SomeArray, Count * SizeOf(ArrayCell))
if SomeArray nil then DoSomeLogic;
DoSomeLogic ... with a Count = 0, right? or was Sizeof(...) = 0? :-)
On Tue, 01 Mar 2011 22:19:38 +0100, Micha Nelissen mi...@neli.hopto.org
wrote:
Paul Ishenin wrote:
01.03.2011 19:29, Jonas Maebe wrote:
That sounds very much like badly written code.
For simplicity we had the next code:
GetMem(SomeArray, Count * SizeOf(ArrayCell))
if SomeArray nil then
On 01 Mar 2011, at 22:58, Vinzent Höfler wrote:
What I wonder is, if GetMem returns a non-NIL, valid pointer for a request
of zero bytes of memory, where does this pointer actually point to? ;)
To a small, non-zero sized memory block.
Jonas___
On Tue, Mar 1, 2011 at 03:07, Leonardo M. Ramé martinr...@yahoo.com wrote:
Hi, I'm trying to compile the r17057 on FreeBSD x86_64 and I'm getting this
error:
fpc/rtl/units/x86_64-freebsd/cpu.s:40: Error: no such instruction:
`cmpxchg16b (%r8)
Any hint?
It seems you should upgrade your
On Wed, Mar 2, 2011 at 01:01, Hans-Peter Diettrich drdiettri...@aol.com wrote:
Paul Ishenin schrieb:
I noticed today that if I want to allocate 0 bytes I get not a nil but a
valid pointer. Why?
This will allow for a following Realloc.
Even in Delphi the behaviour may be subject to the
02.03.2011 7:23, Alexander Klenin wrote:
Maybe {$mode delphi} should by default install dephi-compatible memory
manager?
No. Different units cannot install different memory managers. This will
be even more dangerous than to be just incompatible with delphi.
Best regards,
Paul Ishenin
On Wed, Mar 2, 2011 at 10:28, Paul Ishenin webpi...@mail.ru wrote:
02.03.2011 7:23, Alexander Klenin wrote:
Maybe {$mode delphi} should by default install dephi-compatible memory
manager?
No. Different units cannot install different memory managers. This will be
even more dangerous than to
02.03.2011 5:24, Jonas Maebe wrote:
To a small, non-zero sized memory block.
Memory allocation is time cost. Either user code should compare that for
the zero bytes it should not call a GetMem or GetMem can compare this
for user. Since GetMem already has a condition which compares for 0 - it
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