6.5. WINDOWS NT
try
{
printf("hello #1!\n");
*p = 13; // causes an access violation exception;
printf("hello #2!\n");
}
except(GetExceptionCode()==EXCEPTION_ACCESS_VIOLATION?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
{
printf("access violation, can't recover\n");
}
}
Listing 6.27: MSVC 2003$SG74605 DB 'hello #1!', 0aH, 00H
$SG74606 DB 'hello #2!', 0aH, 00H
$SG74608 DB 'access violation, can''t recover', 0aH, 00H
_DATA ENDS
; scope table:
CONST SEGMENT
$T74622 DD 0ffffffffH ; previous try level
DD FLAT:$L74617 ; filter
DD FLAT:$L74618 ; handler
CONST ENDS
_TEXT SEGMENT
$T74621 = -32 ; size = 4
_p$ = -28 ; size = 4
$SEHRec$ = -24 ; size = 24
_main PROC NEAR
push ebp
mov ebp, esp
push -1 ; previous try level
push OFFSET FLAT:$T74622 ; scope table
push OFFSET FLAT:__except_handler3 ; handler
mov eax, DWORD PTR fs:except_list
push eax ; prev
mov DWORD PTR fs:except_list, esp
add esp, -16
; 3 registers to be saved:
push ebx
push esi
push edi
mov DWORD PTR __$SEHRec$[ebp], esp
mov DWORD PTR _p$[ebp], 0
mov DWORD PTR $SEHRec$[ebp+20], 0 ; previous try level
push OFFSET FLAT:$SG74605 ; 'hello #1!'
call _printf
add esp, 4
mov eax, DWORD PTR _p$[ebp]
mov DWORD PTR [eax], 13
push OFFSET FLAT:$SG74606 ; 'hello #2!'
call _printf
add esp, 4
mov DWORD PTR __$SEHRec$[ebp+20], -1 ; previous try level
jmp SHORT $L74616
; filter code:
$L74617:
$L74627:
mov ecx, DWORD PTR __$SEHRec$[ebp+4]
mov edx, DWORD PTR [ecx]
mov eax, DWORD PTR [edx]
mov DWORD PTR $T74621[ebp], eax
mov eax, DWORD PTR $T74621[ebp]
sub eax, -1073741819; c0000005H
neg eax
sbb eax, eax