函數(shù)參數(shù)傳遞時(shí)被修改,如何下斷點(diǎn)?

closetome123

#0  0xb7f0420d in REGION_UnionNonO (region=0xb3875058, r=0x0, rEnd=0x8285efc, top=633, bottom=634) at region.c:959
#1  0xb7f03cd0 in REGION_RegionOp (newReg=0x80fb664, reg1=0x80fb664, reg2=0xb3875114, overlapFunc=0xb7f0424d <REGION_UnionO>,
    nonOverlap1Func=0xb7f0419a <REGION_UnionNonO>, nonOverlap2Func=0xb7f0419a <REGION_UnionNonO> at region.c:747
#2  0xb7f04d57 in UnionRegion (dst=0x80fb664, src1=0x80fb664, src2=0xb3875114) at region.c:1304
#3  0xb7f04ed3 in AddClipRect (region=0x80fb664, rect=0xb387517 at region.c:1363
#4  0xb7e9d6ab in wndInvalidateRect (hWnd=135247384, prc=0xb387525c, bEraseBkgnd=1) at window.c:4368
#5  0xb7e9d9b1 in InvalidateRect (hWnd=135247384, prc=0xb387525c, bEraseBkgnd=1) at window.c:4457


問(wèn)題出現(xiàn)frame 0 和 1之間.

(gdb) p *r
Cannot access memory at address 0x0
(gdb) up
#1  0xb7f03cd0 in REGION_RegionOp (newReg=0x80fb664, reg1=0x80fb664, reg2=0xb3875114, overlapFunc=0xb7f0424d <REGION_UnionO>,
    nonOverlap1Func=0xb7f0419a <REGION_UnionNonO>, nonOverlap2Func=0xb7f0419a <REGION_UnionNonO> at region.c:747
747                    (* nonOverlap1Func) (pdst, r1, r1BandEnd, top, bot);
(gdb) p *r1
$31 = {rc = {left = 0, top = 0, right = 0, bottom = 0}, next = 0x0, prev = 0x8285edc}
(gdb)

問(wèn)題出現(xiàn)在調(diào)用(* nonOverlap1Func) (pdst, r1, r1BandEnd, top, bot)的時(shí)候r1是有效的, 結(jié)果到了frame 0后傳進(jìn)去的r1就變成了0x0;
程序有上10多個(gè)線(xiàn)程, 有可能是哪里越界造成傳成r1的時(shí)候給覆蓋掉了.我改怎么樣下個(gè)斷點(diǎn),
斷在frame 0狀態(tài)下r被改成0x00的時(shí)候停住, 或者有更好的辦法找出問(wèn)題?

另外這個(gè)函數(shù)出現(xiàn)的幾率是1/1000, 也就是前1000多次調(diào)用是不會(huì)出現(xiàn)問(wèn)題的.
望ggjj們幫忙分析怎么弄? 先謝謝了!

nnnqpnnn

watch不可以嗎

closetome123

我試過(guò)了,watch停不下來(lái).

gigabyte

函數(shù)體斷點(diǎn)
調(diào)用的時(shí)候斷點(diǎn)

jiangf

最有可能是內(nèi)存溢出，strcpy或memcpy時(shí)超過(guò)了緩沖區(qū)的最大值