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digitalmars.D.bugs - [Issue 474] New: in ASM block last line can't be a label

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=474

           Summary: in ASM block last line can't be a label
           Product: D
           Version: 0.173
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: davidl 126.com


asm
{
   jmp label1;
   mov EBX,EAX;
label1:
}

when i have label in the last line of my asm block would make the compiler fail
to compiler it


and i wonder how can this kind of hack being done
asm
{
        mov label1, EAX;  //modify the code to get it run differently
label1: dw 00;
}

and also if i have a array item i want i can get the address directly
asm
{
       mov ax, myarray[1];
}


--
Nov 01 2006
next sibling parent "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
<d-bugmail puremagic.com> wrote in message 
news:bug-474-3 http.d.puremagic.com/issues/...

 asm
 {
   jmp label1;
   mov EBX,EAX;
 label1:
 }

 when i have label in the last line of my asm block would make the compiler 
 fail
 to compiler it


Just put a semicolon after the label.  The same thing applies with regular D 
code -- a label must be followed by a statement, even if it's the empty 
statement.


 and i wonder how can this kind of hack being done
 asm
 {
        mov label1, EAX;  //modify the code to get it run differently
 label1: dw 00;
 }

 and also if i have a array item i want i can get the address directly
 asm
 {
       mov ax, myarray[1];
 }


Those I can't help you with :\
Nov 01 2006
prev sibling next sibling parent Lionello Lunesu <lio lunesu.remove.com> writes:
d-bugmail puremagic.com wrote:

 http://d.puremagic.com/issues/show_bug.cgi?id=474
 
            Summary: in ASM block last line can't be a label
            Product: D
            Version: 0.173
           Platform: PC
         OS/Version: Windows
             Status: NEW
           Severity: normal
           Priority: P2
          Component: DMD
         AssignedTo: bugzilla digitalmars.com
         ReportedBy: davidl 126.com
 
 
 asm
 {
    jmp label1;
    mov EBX,EAX;
 label1:
 }
 
 when i have label in the last line of my asm block would make the compiler fail
 to compiler it
 
 
 and i wonder how can this kind of hack being done
 asm
 {
         mov label1, EAX;  //modify the code to get it run differently
 label1: dw 00;
 }


Or,
label: nop;


 and also if i have a array item i want i can get the address directly
 asm
 {
        mov ax, myarray[1];
 }


I think you'd want "lea eax, myarray[1]".

L.
Nov 02 2006
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=474


davidl 126.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|in ASM block last line can't|in ASM block last line can't
                   |be a label                  |be a label





consider this
class
{
        int dynamicarray[];
        void method()
        {
             asm
             {
                    mov EAX,this;        //failed;
             }
             asm
             {
                    lea EAX, dynamicarray[0]; //without this this ain't gonna
work properly

             }

        }
}


and consider this in a func bar
void bar()
{
   int dynamicarray[];
   asm
   {
       lea EAX,dynamicarray[1];   //this won't tell the address IMHO

   }

}

and how to deal with dynamic array in ASM is  a pain in ass in D


--
Nov 02 2006
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=474


bugzilla digitalmars.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID





This is the way it's supposed to work; a label is not a statement. To make it
compile, add an empty statement:

asm
{
   jmp label1;
   mov EBX,EAX;
label1:
   ;    // <== add this
}

Labels outside of asm blocks work the same way.

Also, if there are separate issues, please list them as separate items in
bugzilla.


--
Nov 09 2006
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=474






int dynamicarray[];
asm
{
    mov EAX,dynamicarray;    // gets the length
    mov EAX,dynamicarray+4;  // gets pointer to the data
}


--
Nov 09 2006