Article ID: 88092
Article Last Modified on 7/5/2005
APPLIES TO
- Microsoft C/C++ Professional Development System 7.0
- Microsoft Visual C++ 1.0 Professional Edition
- Microsoft Visual C++ 1.5 Professional Edition
- Microsoft Visual C++ 1.0 Professional Edition
- Microsoft Visual C++ 2.0 Professional Edition
- Microsoft Visual C++ 2.1
- Microsoft Visual C++ 4.0 Standard Edition
- Microsoft Visual C++ 4.1 Subscription
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 5.0 Standard Edition
- Microsoft Visual C++ 6.0 Service Pack 5
This article was previously published under Q88092
SYMPTOMS
When trying to access static data members in a C++ program with inline assembly, the compiler may report the following errors:
The inline assembler cannot access static data members within a class member function. The sample code below demonstrates the problem.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
MORE INFORMATION
To access the static data member, assign the address of the data member to a temporary variable. The inline assembler can then access the data by loading the address from the temporary variable.
Below is code that demonstrates the problem and workaround.
Sample Code
/* Compile options needed: /AS for 16-bit
* none for 32-bit
*/
#include <stdio.h>
class sample
{
public:
static int value;
sample();
};
int sample::value = 9;
sample::sample()
{
__asm mov value,3 // C2420 and C2415 here
__asm mov sample::value,ax // C2420, C2414, C2400 on
// this line
// For 16-bit workaround, uncomment next three lines.
// void * valueptr=&value;
// __asm mov bx, valueptr
// __asm mov [bx],3
// For 32-bit workaround, uncomment next three lines.
// void * valueptr=&value;
// __asm mov ebx, valueptr
// __asm mov [ebx],3
}
int main( void )
{
sample aSample;
printf( "aSample.value = %d.\n", aSample.value );
return 0;
}
Additional query words: 8.00 8.00c 9.00 10.00 10.10 10.20
Keywords: kbbug KB88092
