• Carl Volhard (15/15) Jun 22 2007 How can i access non-static class fields?
• BCS (10/11) Jun 22 2007 try somthing like this (I haven't even tried to compile this)
• Carl Volhard (6/24) Jun 28 2007 Curiously this way works
• Deewiant (4/13) Jun 28 2007 Ah, that'll be this then: http://d.puremagic.com/issues/show_bug.cgi?id=...
• Manfred Hansen (17/38) Jun 22 2007 I think it should work too.
• Carl Volhard (6/6) Jun 26 2007 Hello and thanks so far.
• Deewiant (5/10) Jun 26 2007 This looks like a bug to me, as 8 is the offsetof of the field. You shou...

Carl Volhard <CarlVolhard web.de> writes:

How can i access non-static class fields?
The Code in the D-Specification doesn't work for me.
I've tried:

public class FooBar {
	public int b = 8;
}

FooBar foo = new FooBar();
FooBar *bar = &foo;
asm{
	mov EBX, [bar];
	mov EAX, FooBar.b[EBX]; 	//<- Line 65
}

and got following compile errors:


...Examples.d(65): Error: 'this' is only allowed in non-static member
...Examples.d(65): Error: this for b needs to be type FooBar not type int
...Examples.d(65): bad type/size of operands 'this.b'

BCS <ao pathlink.com> writes:

Reply to Carl,

 How can i access non-static class fields?

try somthing like this (I haven't even tried to compile this)

public class FooBar {
  public int b = 8;
}
FooBar foo = new FooBar(); // foo is a pointer
asm{
 mov EBX, foo;    // load by value
 mov EAX, [EBX+FooBar.b.offsetof]; //offset from pointer
}  

Carl Volhard <CarlVolhard web.de> writes:

Curiously this way works
    foo.b.offsetof

although the documentation says
    FooBar.b.offsetof
is the correct way. But this code generates the following compile errors:

 Error: 'this' is only allowed in non-static member functions, not main
 Error: this for b needs to be type FooBar not type int


BCS Wrote:

 Reply to Carl,
 
 How can i access non-static class fields?

 
 try somthing like this (I haven't even tried to compile this)
 
 public class FooBar {
   public int b = 8;
 }
 FooBar foo = new FooBar(); // foo is a pointer
 asm{
  mov EBX, foo;    // load by value
  mov EAX, [EBX+FooBar.b.offsetof]; //offset from pointer
 }  
 
 

Deewiant <deewiant.doesnotlike.spam gmail.com> writes:

Carl Volhard wrote:
 Curiously this way works
     foo.b.offsetof
 
 although the documentation says
     FooBar.b.offsetof
 is the correct way. But this code generates the following compile errors:
 
 Error: 'this' is only allowed in non-static member functions, not main
 Error: this for b needs to be type FooBar not type int


Ah, that'll be this then: http://d.puremagic.com/issues/show_bug.cgi?id=515

-- 
Remove ".doesnotlike.spam" from the mail address.

Manfred Hansen <m.hansen kielnet.net> writes:

Carl Volhard wrote:

 How can i access non-static class fields?
 The Code in the D-Specification doesn't work for me.
 I've tried:
 
 public class FooBar {
 public int b = 8;
 }
 
 FooBar foo = new FooBar();
 FooBar *bar = &foo;
 asm{
 mov EBX, [bar];
 mov EAX, FooBar.b[EBX];       //<- Line 65
 }
 
 and got following compile errors:
 
 
 ...Examples.d(65): Error: 'this' is only allowed in non-static member
 ...Examples.d(65): Error: this for b needs to be type FooBar not type int
 ...Examples.d(65): bad type/size of operands 'this.b'

I think it should work too.


Here is my solution:

import tango.io.Stdout;
public class FooBar {
        public int b = 8;
}

void main() {

        int c;
        FooBar foo = new FooBar();
        asm {
                mov  EBX,[foo];
                mov ECX,dword ptr[EBX+8];
                mov c,ECX;
        }
        Stdout("c: ")(c).newline;
}

Carl Volhard <CarlVolhard web.de> writes:

Hello and thanks so far.

The first version with the offset does not work. I got the same compile errors.
The second version works. But I don't understand why I have to add 8 Bytes to
the address? What information fills the first 2 words?

Is there an option to access the fields without counting the offset? (like in
the first Version, only for non-static fields?)

greetings
Carl Volhard

Deewiant <deewiant.doesnotlike.spam gmail.com> writes:

Carl Volhard wrote:
 Hello and thanks so far.
 
 The first version with the offset does not work. I got the same compile errors.
 The second version works. But I don't understand why I have to add 8 Bytes to
the address? What information fills the first 2 words?
 

This looks like a bug to me, as 8 is the offsetof of the field. You should file
it in the 'Zilla.

You should be able to find information on class structure at abi.html in the
documentation.