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?
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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?
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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 Ishenin
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
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
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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
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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; sta
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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Hans-Peter Diettrich 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.
Since the resulting pointer of a realloc isn't guarantied the same as
the source pointer, I don't see a pr
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 mo
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
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 DoSomeLogic;
DoSo
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___
fp
On Tue, Mar 1, 2011 at 03:07, Leonardo M. Ramé 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 assembler/binuti
On Wed, Mar 2, 2011 at 01:01, Hans-Peter Diettrich 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 installed memor
02.03.2011 7:23, Alexander Klenin wrote:
Maybe {$mode delphi} should by default install dephi-compatible memory
manager?
No. Different units cannot install different memory managers. This will
be even more dangerous than to be just incompatible with delphi.
Best regards,
Paul Ishenin
_
On Wed, Mar 2, 2011 at 10:28, Paul Ishenin wrote:
> 02.03.2011 7:23, Alexander Klenin wrote:
>>
>> Maybe {$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 be just
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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