对“仅通过崩溃地址找出源代码的出错行”一文的补充与改进
2010-07-20 20:46:12 来源:WEB开发网排错步骤1)定位崩溃函数。可以查询map文件获得。我的机器编译产生的map文件的部分如下:
Crash
Timestamp is 42881a01 (Mon May 16 11:56:49 2005)
Preferred load address is 00400000
Start Length Name Class
0001:00000000 0000ddf1H .text CODE
0001:0000ddf1 0001000fH .textbss CODE
0002:00000000 00001346H .rdata DATA
0002:00001346 00000000H .edata DATA
0003:00000000 00000104H .CRT$XCA DATA
0003:00000104 00000104H .CRT$XCZ DATA
0003:00000208 00000104H .CRT$XIA DATA
0003:0000030c 00000109H .CRT$XIC DATA
0003:00000418 00000104H .CRT$XIZ DATA
0003:0000051c 00000104H .CRT$XPA DATA
0003:00000620 00000104H .CRT$XPX DATA
0003:00000724 00000104H .CRT$XPZ DATA
0003:00000828 00000104H .CRT$XTA DATA
0003:0000092c 00000104H .CRT$XTZ DATA
0003:00000a30 00000b93H .data DATA
0003:000015c4 00001974H .bss DATA
0004:00000000 00000014H .idata$2 DATA
0004:00000014 00000014H .idata$3 DATA
0004:00000028 00000110H .idata$4 DATA
0004:00000138 00000110H .idata$5 DATA
0004:00000248 000004afH .idata$6 DATA
Address Publics by Value Rva+Base Lib:Object
0001:00000020 _main 00401020 f Crash.obj
0001:00000060 ?Crash1@@YAXXZ 00401060 f Crash.obj
0001:000000a0 __chkesp 004010a0 f LIBCD:chkesp.obj
0001:000000e0 _mainCRTStartup 004010e0 f LIBCD:crt0.obj
0001:00000210 __amsg_exit 00401210 f LIBCD:crt0.obj
0001:00000270 __CrtDbgBreak 00401270 f LIBCD:dbgrpt.obj
...
对于崩溃地址0x00401082而言,小于此地址中最接近的地址(Rva+Base中的地址)为00401060,其对应的函数名为?Crash1@@YAXXZ,由于所有以问号开头的函数名称都是 C++ 修饰的名称 ,"@@YAXXZ"则为区别重载函数而加的后缀,所以?Crash1@@YAXXZ就是我们的源程序中,Crash1() 这个函数。
排错步骤2)定位出错行。打开编译生成的"cod"文件,我机器上生成的文件内容如下:
TITLE E:CrashCrash。cpp
.386P
include listing.inc
if @Version gt 510
.model FLAT
else
_TEXT SEGMENT PARA USE32 PUBLIC ''CODE''
_TEXT ENDS
_DATA SEGMENT DWORD USE32 PUBLIC ''DATA''
_DATA ENDS
CONST SEGMENT DWORD USE32 PUBLIC ''CONST''
CONST ENDS
_BSS SEGMENT DWORD USE32 PUBLIC ''BSS''
_BSS ENDS
$$SYMBOLS SEGMENT BYTE USE32 ''DEBSYM''
$$SYMBOLS ENDS
$$TYPES SEGMENT BYTE USE32 ''DEBTYP''
$$TYPES ENDS
_TLS SEGMENT DWORD USE32 PUBLIC ''TLS''
_TLS ENDS
; COMDAT _main
_TEXT SEGMENT PARA USE32 PUBLIC ''CODE''
_TEXT ENDS
; COMDAT ?Crash1@@YAXXZ
_TEXT SEGMENT PARA USE32 PUBLIC ''CODE''
_TEXT ENDS
FLAT GROUP _DATA, CONST, _BSS
ASSUME CS: FLAT, DS: FLAT, SS: FLAT
endif
PUBLIC ?Crash1@@YAXXZ ; Crash1
PUBLIC _main
EXTRN __chkesp:NEAR
; COMDAT _main
_TEXT SEGMENT
_main PROC NEAR ; COMDAT
; 9 : {
00000 55 push ebp
00001 8b ec mov ebp, esp
00003 83 ec 40 sub esp, 64 ; 00000040H
00006 53 push ebx
00007 56 push esi
00008 57 push edi
00009 8d 7d c0 lea edi, DWORD PTR [ebp-64]
0000c b9 10 00 00 00 mov ecx, 16 ; 00000010H
00011 b8 cc cc cc cc mov eax, -858993460 ; ccccccccH
00016 f3 ab rep stosd
; 10 : Crash1();
00018 e8 00 00 00 00 call ?Crash1@@YAXXZ ; Crash1
; 11 : return 0;
0001d 33 c0 xor eax, eax
; 12 : }
0001f 5f pop edi
00020 5e pop esi
00021 5b pop ebx
00022 83 c4 40 add esp, 64 ; 00000040H
00025 3b ec cmp ebp, esp
00027 e8 00 00 00 00 call __chkesp
0002c 8b e5 mov esp, ebp
0002e 5d pop ebp
0002f c3 ret 0
_main ENDP
_TEXT ENDS
; COMDAT ?Crash1@@YAXXZ
_TEXT SEGMENT
_p$ = -4
?Crash1@@YAXXZ PROC NEAR ; Crash1, COMDAT
; 15 : {
00000 55 push ebp
00001 8b ec mov ebp, esp
00003 83 ec 44 sub esp, 68 ; 00000044H
00006 53 push ebx
00007 56 push esi
00008 57 push edi
00009 8d 7d bc lea edi, DWORD PTR [ebp-68]
0000c b9 11 00 00 00 mov ecx, 17 ; 00000011H
00011 b8 cc cc cc cc mov eax, -858993460 ; ccccccccH
00016 f3 ab rep stosd
; 16 : char * p =(char*)100;
00018 c7 45 fc 64 00
00 00 mov DWORD PTR _p$[ebp], 100 ; 00000064H
; 17 : *p=100;
0001f 8b 45 fc mov eax, DWORD PTR _p$[ebp]
00022 c6 00 64 mov BYTE PTR [eax], 100 ; 00000064H
; 18 : }
00025 5f pop edi
00026 5e pop esi
00027 5b pop ebx
00028 8b e5 mov esp, ebp
0002a 5d pop ebp
0002b c3 ret 0
?Crash1@@YAXXZ ENDP ; Crash1
_TEXT ENDS
END
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