CHAPTER 68. WINDOWS NT CHAPTER 68. WINDOWS NT
}
}
Now there are twotryblocks. So thescope table now has two entries, one for each block.Previous try levelchanges as
execution flow enters or exits thetryblock.
Listing 68.8: MSVC 2003$SG74606 DB 'in filter. code=0x%08X', 0aH, 00H
$SG74608 DB 'yes, that is our exception', 0aH, 00H
$SG74610 DB 'not our exception', 0aH, 00H
$SG74617 DB 'hello!', 0aH, 00H
$SG74619 DB '0x112233 raised. now let''s crash', 0aH, 00H
$SG74621 DB 'access violation, can''t recover', 0aH, 00H
$SG74623 DB 'user exception caught', 0aH, 00H
_code$ = 8 ; size = 4
_ep$ = 12 ; size = 4
_filter_user_exceptions PROC NEAR
push ebp
mov ebp, esp
mov eax, DWORD PTR _code$[ebp]
push eax
push OFFSET FLAT:$SG74606 ; 'in filter. code=0x%08X'
call _printf
add esp, 8
cmp DWORD PTR _code$[ebp], 1122867; 00112233H
jne SHORT $L74607
push OFFSET FLAT:$SG74608 ; 'yes, that is our exception'
call _printf
add esp, 4
mov eax, 1
jmp SHORT $L74605
$L74607:
push OFFSET FLAT:$SG74610 ; 'not our exception'
call _printf
add esp, 4
xor eax, eax
$L74605:
pop ebp
ret 0
_filter_user_exceptions ENDP
; scope table:
CONST SEGMENT
$T74644 DD 0ffffffffH ; previous try level for outer block
DD FLAT:$L74634 ; outer block filter
DD FLAT:$L74635 ; outer block handler
DD 00H ; previous try level for inner block
DD FLAT:$L74638 ; inner block filter
DD FLAT:$L74639 ; inner block handler
CONST ENDS
$T74643 = -36 ; size = 4
$T74642 = -32 ; size = 4
_p$ = -28 ; size = 4
$SEHRec$ = -24 ; size = 24
_main PROC NEAR
push ebp
mov ebp, esp
push -1 ; previous try level
push OFFSET FLAT:$T74644
push OFFSET FLAT:__except_handler3
mov eax, DWORD PTR fs:except_list
push eax
mov DWORD PTR fs:__except_list, esp
add esp, -20
push ebx
push esi
push edi
mov DWORD PTR __$SEHRec$[ebp], esp