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digitalmars.D - inline asm bug

reply Blas Rodriguez Somoza <blas puertareal.com> writes:
Hello

I've found something that seems to a bug working with the inline assembler, but
I'm not sure if it is the expected behavoir.

The reference to struct/unions don't work if there is nested structs/unions
defined separately. Example:

union test {
	ulong var1;
	struct var2 {
		ubyte zz;
	}
}

union test2 {
	ulong var1;
	pp var2;	
}

struct pp {
	ubyte zz;
}

..
..
asm{
	..
	movzx EAX, test.var2.zz[ESI];
	movzx EAX, test2.var2.zz[ESI];
	..
}

The first line succeed but the second fails:

Error: need 'this' for address of var2
Error: need 'this' for address of var2
bad type/size of operands '*(& var2)'    

When, by error, I change the second line to 

	movzx EAX, test2.var2->zz[ESI];

the compiler crash.


Regards 
Blas Rodriguez Somoza
Jan 16 2008
next sibling parent davidl <davidl 126.com> writes:
在 Thu, 17 Jan 2008 12:21:21 +0800，Blas Rodriguez Somoza  
<blas puertareal.com> 写道:


 Hello

 I've found something that seems to a bug working with the inline  
 assembler, but I'm not sure if it is the expected behavoir.

 The reference to struct/unions don't work if there is nested  
 structs/unions defined separately. Example:

 union test {
 	ulong var1;
 	struct var2 {
 		ubyte zz;
 	}
 }

 union test2 {
 	ulong var1;
 	pp var2;	
 }

 struct pp {
 	ubyte zz;
 }

 ..
 ..
 asm{
 	..
 	movzx EAX, test.var2.zz[ESI];
 	movzx EAX, test2.var2.zz[ESI];
 	..
 }


I think this should compile


 The first line succeed but the second fails:

 Error: need 'this' for address of var2
 Error: need 'this' for address of var2
 bad type/size of operands '*(& var2)'

 When, by error, I change the second line to

 	movzx EAX, test2.var2->zz[ESI];

 the compiler crash.


 Regards
 Blas Rodriguez Somoza


there's no -> operator in D, but compiler shouldn't crash.


-- 
使用 Opera 革命性的电子邮件客户程序: http://www.opera.com/mail/
Jan 16 2008
prev sibling parent reply "Simen Kjaeraas" <simen.kjaras gmail.com> writes:
Blas Rodriguez Somoza <blas puertareal.com> wrote:


 Hello

 I've found something that seems to a bug working with the inline  
 assembler, but I'm not sure if it is the expected behavoir.

 The reference to struct/unions don't work if there is nested  
 structs/unions defined separately. Example:

 union test {
 	ulong var1;
 	struct var2 {
 		ubyte zz;
 	}
 }

 union test2 {
 	ulong var1;
 	pp var2;	
 }

 struct pp {
 	ubyte zz;
 }

 ..
 ..
 asm{
 	..
 	movzx EAX, test.var2.zz[ESI];
 	movzx EAX, test2.var2.zz[ESI];
 	..
 }

 The first line succeed but the second fails:

 Error: need 'this' for address of var2
 Error: need 'this' for address of var2
 bad type/size of operands '*(& var2)'

 When, by error, I change the second line to

 	movzx EAX, test2.var2->zz[ESI];

 the compiler crash.


 Regards
 Blas Rodriguez Somoza


To me it seems you are referencing the struct definitions/prototypes, not  
a struct instance. Try something like this:


union test {
	ulong var1;
	struct var2 {
		ubyte zz;
	}
}

union test2 {
	ulong var1;
	pp var2;	
}

struct pp {
	ubyte zz;
}

test foo; // new lines here
test2 bar;

..
..

asm{
	..
	movzx EAX, foo.var2.zz[ESI];
	movzx EAX, bar.var2.zz[ESI];
	..
}

Simen Kjaeraas
Jan 17 2008
parent brodsom <blas puertareal.com> writes:
Simen Kjaeraas Wrote:


 Blas Rodriguez Somoza <blas puertareal.com> wrote:
 

 Hello

 I've found something that seems to a bug working with the inline  
 assembler, but I'm not sure if it is the expected behavoir.

 The reference to struct/unions don't work if there is nested  
 structs/unions defined separately. Example:

 union test {
 	ulong var1;
 	struct var2 {
 		ubyte zz;
 	}
 }

 union test2 {
 	ulong var1;
 	pp var2;	
 }

 struct pp {
 	ubyte zz;
 }

 ..
 ..
 asm{
 	..
 	movzx EAX, test.var2.zz[ESI];
 	movzx EAX, test2.var2.zz[ESI];
 	..
 }

 The first line succeed but the second fails:

 Error: need 'this' for address of var2
 Error: need 'this' for address of var2
 bad type/size of operands '*(& var2)'

 When, by error, I change the second line to

 	movzx EAX, test2.var2->zz[ESI];

 the compiler crash.


 Regards
 Blas Rodriguez Somoza


 
 To me it seems you are referencing the struct definitions/prototypes, not  
 a struct instance. Try something like this:
 
 
 union test {
 	ulong var1;
 	struct var2 {
 		ubyte zz;
 	}
 }
 
 union test2 {
 	ulong var1;
 	pp var2;	
 }
 
 struct pp {
 	ubyte zz;
 }
 
 test foo; // new lines here
 test2 bar;
 
 ..
 ..
 
 asm{
 	..
 	movzx EAX, foo.var2.zz[ESI];
 	movzx EAX, bar.var2.zz[ESI];
 	..
 }
 
 Simen Kjaeraas


In inline assembler this kind of reference must be to a struct/union
definition. It means an offset from the address contained in the register.
Jan 18 2008