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February 28, 2011
Some weird crashes
I'm trying to wrap the newest mysql c connector, but I get some weird 
bugs. I don't know any assembly, so I don't even know if I've included 
enough info.. I hope this is a small enough test case so someone can 
understand the issue.
I've used implib on the included dll and rdmd and dmd 2.051 to compile.

// CORRECT
auto res = mysql_library_init(0, null, null);

auto cn = mysql_init(null);
auto oldcn = cn;

writeln(mysql_errno(cn));
assert(cn == oldcn);

auto err = mysql_errno(cn);
//assert(cn == oldcn); // notice this is commented out

mysql_close(cn);
mysql_library_end();


0040201A  |. E8 F5B30300    CALL <JMP.&libmysql.mysql_server_init>
0040201F  |. 6A 00          PUSH 0
00402021  |. E8 E8B30300    CALL <JMP.&libmysql.mysql_init>
00402026  |. 8945 F8        MOV DWORD PTR SS:[EBP-8],EAX
00402029  |. 8945 FC        MOV DWORD PTR SS:[EBP-4],EAX
0040202C  |. FF75 F8        PUSH DWORD PTR SS:[EBP-8]
0040202F  |. E8 D4B30300    CALL <JMP.&libmysql.mysql_errno>
00402034  |. 83C4 04        ADD ESP,4
00402037  |. E8 4C000000    CALL mytest_w.00402088
0040203C  |. 8B45 F8        MOV EAX,DWORD PTR SS:[EBP-8]
0040203F  |. 3B45 FC        CMP EAX,DWORD PTR SS:[EBP-4]
00402042  |. B9 01000000    MOV ECX,1
00402047  |. 74 02          JE SHORT mytest_w.0040204B
00402049  |. 8ACD           MOV CL,CH
0040204B  |> 894D F4        MOV DWORD PTR SS:[EBP-C],ECX
0040204E  |. 74 0A          JE SHORT mytest_w.0040205A
00402050  |. B8 1A000000    MOV EAX,1A
00402055  |. E8 662A0000    CALL mytest_w.00404AC0
0040205A  |> FF75 F8        PUSH DWORD PTR SS:[EBP-8]
0040205D  |. E8 A6B30300    CALL <JMP.&libmysql.mysql_errno>
00402062  |. 807D F4 00     CMP BYTE PTR SS:[EBP-C],0
00402066  |. 75 0A          JNZ SHORT mytest_w.00402072
00402068  |. B8 1D000000    MOV EAX,1D
0040206D  |. E8 4E2A0000    CALL mytest_w.00404AC0
00402072  |> FF75 F8        PUSH DWORD PTR SS:[EBP-8]
00402075  |. E8 88B30300    CALL <JMP.&libmysql.mysql_close>
0040207A  |. E8 7DB30300    CALL <JMP.&libmysql.mysql_server_end>
0040207F  |. 31C0           XOR EAX,EAX
00402081  |. 83C4 18        ADD ESP,18
00402084  |. C9             LEAVE
00402085  \. C3             RETN



// ERROR
auto res = mysql_library_init(0, null, null);

auto cn = mysql_init(null);
auto oldcn = cn;

writeln(mysql_errno(cn));
assert(cn == oldcn); // when the last assert is active, the above line 
changes cn and thus fails.

auto err = mysql_errno(cn);
assert(cn == oldcn);

mysql_close(cn);
mysql_library_end();
0040201A  |. E8 D5B30300    CALL <JMP.&libmysql.mysql_server_init>
0040201F  |. 6A 00          PUSH 0
00402021  |. E8 C8B30300    CALL <JMP.&libmysql.mysql_init>
00402026  |. 8945 F8        MOV DWORD PTR SS:[EBP-8],EAX
00402029  |. 8945 FC        MOV DWORD PTR SS:[EBP-4],EAX
0040202C  |. FF75 F8        PUSH DWORD PTR SS:[EBP-8]
0040202F  |. E8 B4B30300    CALL <JMP.&libmysql.mysql_errno>
00402034  |. 83C4 04        ADD ESP,4
00402037  |. E8 30000000    CALL mytest_f.0040206C
0040203C  |. 8B45 F8        MOV EAX,DWORD PTR SS:[EBP-8]
0040203F  |. 3B45 FC        CMP EAX,DWORD PTR SS:[EBP-4]
00402042  |. 74 0A          JE SHORT mytest_f.0040204E
00402044  |. B8 1A000000    MOV EAX,1A
00402049  |. E8 562A0000    CALL mytest_f.00404AA4
0040204E  |> FF75 F8        PUSH DWORD PTR SS:[EBP-8]
00402051  |. E8 92B30300    CALL <JMP.&libmysql.mysql_errno>
00402056  |. FF75 F8        PUSH DWORD PTR SS:[EBP-8]
00402059  |. E8 84B30300    CALL <JMP.&libmysql.mysql_close>
0040205E  |. E8 79B30300    CALL <JMP.&libmysql.mysql_server_end>
00402063  |. 31C0           XOR EAX,EAX
00402065  |. 83C4 18        ADD ESP,18
00402068  |. C9             LEAVE
00402069  \. C3             RETN
February 28, 2011
Re: Some weird crashes
On 28.02.2011 18:52, simendsjo wrote:
>
> // ERROR
> auto res = mysql_library_init(0, null, null);
>
> auto cn = mysql_init(null);
> auto oldcn = cn;
>
> writeln(mysql_errno(cn));
> assert(cn == oldcn); // when the last assert is active, the above line
> changes cn and thus fails.
>
> auto err = mysql_errno(cn);
> assert(cn == oldcn);

Btw, if I don't use writeln it doesn't fail..
February 28, 2011
Re: Some weird crashes
On Mon, 28 Feb 2011 22:04:44 +0300, simendsjo <simen.endsjo@pandavre.com>  
wrote:

> On 28.02.2011 18:52, simendsjo wrote:
>>
>> // ERROR
>> auto res = mysql_library_init(0, null, null);
>>
>> auto cn = mysql_init(null);
>> auto oldcn = cn;
>>
>> writeln(mysql_errno(cn));
>> assert(cn == oldcn); // when the last assert is active, the above line
>> changes cn and thus fails.
>>
>> auto err = mysql_errno(cn);
>> assert(cn == oldcn);
>
> Btw, if I don't use writeln it doesn't fail..

I think you have a bug at line 42.

On a serious note, it might have helped if you'd attached source code, or  
at least binaries.
February 28, 2011
Re: Some weird crashes
On 28.02.2011 20:24, Denis Koroskin wrote:
> I think you have a bug at line 42.
>
> On a serious note, it might have helped if you'd attached source code,
> or at least binaries.

The file was too large to be attached. Here's a link to a public hosting 
service: http://share1t.com/4xgt2l. Everything (including mysql 
libraries) is included.

Not sure what line you are referring to though.
February 28, 2011
Re: Some weird crashes
simendsjo:

> Not sure what line you are referring to though.

http://en.wikipedia.org/wiki/Answer_to_Life,_the_Universe,_and_Everything#The_number_42

Bye,
bearophile
March 01, 2011
Re: Some weird crashes
On 28.02.2011 20:24, Denis Koroskin wrote:
> On Mon, 28 Feb 2011 22:04:44 +0300, simendsjo
> <simen.endsjo@pandavre.com> wrote:
>
>> On 28.02.2011 18:52, simendsjo wrote:
>>>
>>> // ERROR
>>> auto res = mysql_library_init(0, null, null);
>>>
>>> auto cn = mysql_init(null);
>>> auto oldcn = cn;
>>>
>>> writeln(mysql_errno(cn));
>>> assert(cn == oldcn); // when the last assert is active, the above line
>>> changes cn and thus fails.
>>>
>>> auto err = mysql_errno(cn);
>>> assert(cn == oldcn);
>>
>> Btw, if I don't use writeln it doesn't fail..
>
> I think you have a bug at line 42.
>
> On a serious note, it might have helped if you'd attached source code,
> or at least binaries.

Hmmm.. Seems my post last night didn't get through..
Here's the code and necessary libraries: http://share1t.com/4xgt2l
March 02, 2011
Re: Some weird crashes
On Tue, 01 Mar 2011 23:01:21 +0300, simendsjo <simen.endsjo@pandavre.com>  
wrote:

> On 28.02.2011 20:24, Denis Koroskin wrote:
>> On Mon, 28 Feb 2011 22:04:44 +0300, simendsjo
>> <simen.endsjo@pandavre.com> wrote:
>>
>>> On 28.02.2011 18:52, simendsjo wrote:
>>>>
>>>> // ERROR
>>>> auto res = mysql_library_init(0, null, null);
>>>>
>>>> auto cn = mysql_init(null);
>>>> auto oldcn = cn;
>>>>
>>>> writeln(mysql_errno(cn));
>>>> assert(cn == oldcn); // when the last assert is active, the above line
>>>> changes cn and thus fails.
>>>>
>>>> auto err = mysql_errno(cn);
>>>> assert(cn == oldcn);
>>>
>>> Btw, if I don't use writeln it doesn't fail..
>>
>> I think you have a bug at line 42.
>>
>> On a serious note, it might have helped if you'd attached source code,
>> or at least binaries.
>
> Hmmm.. Seems my post last night didn't get through..
> Here's the code and necessary libraries: http://share1t.com/4xgt2l

What appears to be an error here is in fact an Access Violation at  
mysql_close.

Here is a reduced test-case:

import mysql;

void main()
{
    auto res = mysql_library_init(0, null, null);
    auto cn = mysql_init(null);
    mysql_close(cn);
}


Then I decided to check whether it is D's fault or not by porting this  
short program to C. Here is what I got:

// mysql.c
int mysql_server_init(int argc, char **argv, char **groups);
struct MYSQL* mysql_init(struct MYSQL*);
void mysql_close(struct MYSQL*);

#define mysql_library_init mysql_server_init

#define NULL 0

#include <stdio.h>

int main()
{
	int res = mysql_library_init(0, NULL, NULL);
	struct MYSQL* cn = mysql_init(NULL);
	printf("here");
	mysql_close(cn);
	return 0;
}

This program works fine, BUT try commenting out the "printf" call and it  
crashes, too. That said, it is unlikely to be DMD fault here. Are you sure  
those prototypes and/or .lib/.dll files are fine?
March 02, 2011
Re: Some weird crashes
On 02.03.2011 18:24, Denis Koroskin wrote:
> On Tue, 01 Mar 2011 23:01:21 +0300, simendsjo
> <simen.endsjo@pandavre.com> wrote:
>
>> On 28.02.2011 20:24, Denis Koroskin wrote:
>>> On Mon, 28 Feb 2011 22:04:44 +0300, simendsjo
>>> <simen.endsjo@pandavre.com> wrote:
>>>
>>>> On 28.02.2011 18:52, simendsjo wrote:
>>>>>
>>>>> // ERROR
>>>>> auto res = mysql_library_init(0, null, null);
>>>>>
>>>>> auto cn = mysql_init(null);
>>>>> auto oldcn = cn;
>>>>>
>>>>> writeln(mysql_errno(cn));
>>>>> assert(cn == oldcn); // when the last assert is active, the above line
>>>>> changes cn and thus fails.
>>>>>
>>>>> auto err = mysql_errno(cn);
>>>>> assert(cn == oldcn);
>>>>
>>>> Btw, if I don't use writeln it doesn't fail..
>>>
>>> I think you have a bug at line 42.
>>>
>>> On a serious note, it might have helped if you'd attached source code,
>>> or at least binaries.
>>
>> Hmmm.. Seems my post last night didn't get through..
>> Here's the code and necessary libraries: http://share1t.com/4xgt2l
>
> What appears to be an error here is in fact an Access Violation at
> mysql_close.
>
> Here is a reduced test-case:
>
> import mysql;
>
> void main()
> {
> auto res = mysql_library_init(0, null, null);
> auto cn = mysql_init(null);
> mysql_close(cn);
> }
>
>
> Then I decided to check whether it is D's fault or not by porting this
> short program to C. Here is what I got:
>
> // mysql.c
> int mysql_server_init(int argc, char **argv, char **groups);
> struct MYSQL* mysql_init(struct MYSQL*);
> void mysql_close(struct MYSQL*);
>
> #define mysql_library_init mysql_server_init
>
> #define NULL 0
>
> #include <stdio.h>
>
> int main()
> {
> int res = mysql_library_init(0, NULL, NULL);
> struct MYSQL* cn = mysql_init(NULL);
> printf("here");
> mysql_close(cn);
> return 0;
> }
>
> This program works fine, BUT try commenting out the "printf" call and it
> crashes, too. That said, it is unlikely to be DMD fault here. Are you
> sure those prototypes and/or .lib/.dll files are fine?


The prototypes might be wrong. I'm in the process of checking everything.

The dll is the one included in the download. The lib is made with implib 
/system

But your c program fails..? Could the problem be with the implib library..?

I couldn't find a free download for coff2omf, that's why I don't use the 
supplied .lib.
March 02, 2011
Re: Some weird crashes
On 3/2/11 10:52 AM, simendsjo wrote:
> I couldn't find a free download for coff2omf, that's why I don't use the
> supplied .lib.

You can use coffimplib: ftp://ftp.digitalmars.com/coffimplib.zip
March 03, 2011
Re: Some weird crashes
Thanks! I couldn't find it on the web page.
coffimplib is missing to option to prepend _ to the types as implib
does with /system. Any way around this (without changing all my code)?
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