mORMot Open Source

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Access violation error after commit 4fad13563

Since commit 4fad13563f6769b475a77f6f162f5a4253c94998 I am getting a Access violation error in line 5448 of mormot.core.json using win64 Delphi 13.1. The stack follows:

_JS_Ansi('',(W=($0000011D0D18EC70,TOnTextWriterFlush @ 0x0000011d0e4a6490,$0000011D0E802E40,8192,0,0,0,[twoForceJsonStandard],[twfDestIsOwnedStream,twfRawByteStringStream],0,$0000011D0E802E9C,$0000011D0E804E30,??,nil,nil),Info=(??,ptRawUtf8,pctNone,[rcfIsManaged,rcfJsonString,rcfMultiLineStrings],nil,nil,$00007ff7c83036e0,$00007ff7c8303dc0,??,??,??,$00007ff7c8303980,ptNone,ptNone,$00007ff7c836f820,$00007ff7c83686f0,??,??,??,??,??,??,??,??,??,$0000000000000000,nil,nil)))
_JS_DynArray($0000000000000008,(W=($FFFFFFFFFFFFFFFF,TOnTextWriterFlush @ 0xec83485356575551,$FFFFFFFFFFFFFFFF,,,,,TTextWriterOptions @ 0xec83485356575581,TTextWriterFlags @ 0xec83485356575583,,$FFFFFFFFFFFFFFFF,$FFFFFFFFFFFFFFFF,??,$FFFFFFFFFFFFFFFF,$FFFFFFFFFFFFFFFF),Info=(??,??,??,??,??,$FFFFFFFFFFFFFFFF,??,??,??,??,??,??,??,??,??,??,??,??,??,??,??,??,??,??,??,??,$FFFFFFFFFFFFFFFF,??)))
_JS_RttiCustom('',(W=??,Info=??,Prop=??,Options=(__data="",__basetype=??)))
TInterfaceMethodArgument.AddJson((ParamName=??,ArgTypeName=??,ArgRtti=??,ValueType=??,ValueDirection=??,ValueVar=??,ValueKindAsm=(__data="",__basetype=??),RegisterIdent=??,FPRegisterIdent=??,IndexVar=??,SizeInStack=??,InStackOffset=??,RawExecute=??,OffsetAsValue=??),??,??,(__data='',__basetype=??))
TInterfacedObjectFake.FakeCallGetJsonFromStack(??,(Stack=??,Method=??,Result=??,ResultType=??,ServiceCustomAnswerPoint=??,Value=(__element_ptr=([0]=??,[1]=??,[2]=??,[3]=??,[4]=??,[5]=??,[6]=??,[7]=??,[8]=??,[9]=??,[10]=??,[11]=??,[12]=??,[13]=??,[14]=??,[15]=??,[16]=??,[17]=??,[18]=??,[19]=??,[20]=??,[21]=??,[22]=??,[23]=??,[24]=??,[25]=??,[26]=??,[27]=??,[28]=??,[29]=??,[30]=??,[31]=??))),(Data=??))
TInterfacedObjectFakeClient.FakeCallGetJsonFromStack(??,(Stack=$0000001d0ceff788,Method=$0000011d7a2d7258,Result=$0000001d0ceff738,ResultType=imvNone,ServiceCustomAnswerPoint=$0000001d0ceff850,Value=([0]=$00007ff7c7e39a88,[1]=$0000001d0ceff7d0,[2]=$0000001d0ceff7d8,[3]=$0000001d0ceff7e0,[4]=$0000001d0ceff828,[5]=$0000001d0ceff7f0,[6]=$0000001d0ceff7f8,[7]=$0000001d0ceff800,[8]=$0000001d0ceff850,[9]=$0000011d7a2820c0,[10]=$0000011d7c3a5470,[11]=$0000001d0ceff8c4)),(Data=nil))
TInterfacedObjectFake.FakeCallInternalProcess((1529898381,$485356575541CCCC,$8948CB894828EC83,$8948CF894CC933D6,??,3347269881,[ifoJsonAsExtended],??,$00007FF7C843F216,$00007FF7C843F21E,??),(Stack=nil,Method=nil,Result=nil,ResultType=imvNone,ServiceCustomAnswerPoint=$0000000000000005,Value=([0]=$0000001d0ceff7c0,[1]=$00007ff7c947660d,[2]=$0000011d0e4a6520,[3]=$0000001d0ceff850,[4]=$00490010a0000002,[5]=nil,[6]=$0000000000000001,[7]=$0000001d0ceff828,[8]=nil,[9]=nil,[10]=$0000011d0d40e628,[11]=$00007ff70001d4c0,[12]=$0000001d0000ea60,[13]=nil)))
TInterfacedObjectFakeRaw.FakeCall(??,$0000001d0ceff788)
x64FakeStub

ab

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From: France

Registered: 2010-06-21

Posts: 15,484

Website

Re: Access violation error after commit 4fad13563

Please don't post stack traces like that directly.
There is not enough information, and it is filling the forum DB for no benefit.

What is the context?
Please create a gist with
- the interface method involved
- the transmitted JSON involved

Aren't you mixing string types and codepages in your client code?
What are rec^.length and rec^.codepage values?

The line 5448 should not be compiled at all under Delphi 13.1.
Debug a little more and find out where is the actual issue.

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Re: Access violation error after commit 4fad13563

What is the context?
Please create a gist with
- the interface method involved
- the transmitted JSON involved

Aren't you mixing string types and codepages in your client code?

No, as far as I can understand the question

What are rec^.length and rec^.codepage values?

Debugger in delphi can not provide this and I believe rec does not correct point to memory

The line 5448 should not be compiled at all under Delphi 13.1.
Debug a little more and find out where is the actual issue.

https://gist.github.com/dkounal/913a3fa … 355ec8ced5

Last edited by dcoun (2026-05-18 11:08:06)

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Re: Access violation error after commit 4fad13563

I found a solution. It simply needs to avoid rawutf8 as type in records that will be used as parameters in this interface.
Replacing rawutf8 with utf8string works ok. Probably it is a compiler problem from Delphi 13.1

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 15,484

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Re: Access violation error after commit 4fad13563

But RawUtf8 is in fact Utf8String...
In practice, TypeInfo(RawUtf8) = TypeInfo(System.UTF8String) so there should be no difference!

Weird that we can't reproduce it...

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Re: Access violation error after commit 4fad13563

I have not managed to reproduce it and I am really in a hurry these days.
Thank you a lot for your time.

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Re: Access violation error after commit 4fad13563

Weird that we can't reproduce it...

I could not resist....

https://gist.github.com/dkounal/3fd7bff … ce3175e764

it reproduces the problem

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 15,484

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Re: Access violation error after commit 4fad13563

tarray<rawutf8> generics syntax should indeed be supported.

There was an issue to be fixed:
https://github.com/synopse/mORMot2/commit/9a7ae37f1

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Re: Access violation error after commit 4fad13563

Thanks a lot Arnaud
So, this declaration in the rtti caused the problem.
Is it possible to be warned for such errors before I find errors in other place of the code?

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 15,484

Website

Re: Access violation error after commit 4fad13563

The bug was silent because it registered tarray<rawutf8> as a dynamic array with a type name of 'rawutf8' and not something genuine.
So it thought that the next rawutf8 was a dynamic array...
It is fixed now with my above commit.

I have reviewed the code to fix such errors, and ensure nested dynamic array types in RTTI definition have a proper internal genuine name:
https://github.com/synopse/mORMot2/commit/6ba6138f8
Normal syntax errors would trigger an exception.

dcoun

Member

From: Crete, Greece

Registered: 2020-02-18

Posts: 528

Re: Access violation error after commit 4fad13563

Thank you again Arnaud.
It is much better now!