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回复 27# lin5161678
哪儿错了,自己看....- [root@speedlinux ~]# gdb a.out
- GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
- Copyright (C) 2012 Free Software Foundation, Inc.
- License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
- This is free software: you are free to change and redistribute it.
- There is NO WARRANTY, to the extent permitted by law. Type "show copying"
- and "show warranty" for details.
- This GDB was configured as "i686-linux-gnu".
- For bug reporting instructions, please see:
- <http://bugs.launchpad.net/gdb-linaro/>...
- Reading symbols from /root/a.out...done.
- (gdb) list
- 4
- 5 using namespace std;
- 6
- 7 struct STEST {
- 8 int i;
- 9 int p[10];
- 10 };
- 11
- 12 int main(void)
- 13 {
- (gdb) list
- 14 struct STEST x;
- 15 int *p = &x.i;
- 16 p[0] = 4;
- 17 p[1] = 3;
- 18
- 19 string s1="test";
- 20 char msgBuffer[256];
- 21 if(!s1.empty())
- 22 sprintf(msgBuffer, "s1:%s\n",s1.c_str());
- 23 x.p[0]=5;
- (gdb) list
- 24 printf("msgBuffer%s,%d\n", msgBuffer, x.i,x.p[0]);
- 25 return 0;
- 26 }
- (gdb) l
- Line number 27 out of range; test.c has 26 lines.
- (gdb) break 15 16
- Junk at end of arguments.
- (gdb) break 15
- Breakpoint 1 at 0x8048800: file test.c, line 15.
- (gdb) break 16
- Breakpoint 2 at 0x8048808: file test.c, line 16.
- (gdb) break 17
- Breakpoint 3 at 0x8048812: file test.c, line 17.
- (gdb) break 18
- Breakpoint 4 at 0x804881f: file test.c, line 18.
- (gdb) break 19
- Note: breakpoint 4 also set at pc 0x804881f.
- Breakpoint 5 at 0x804881f: file test.c, line 19.
- (gdb) break 20
- Breakpoint 6 at 0x8048853: file test.c, line 20.
- (gdb) break 22
- Breakpoint 7 at 0x8048866: file test.c, line 22.
- (gdb) break 23
- Breakpoint 8 at 0x804888a: file test.c, line 23.
- (gdb) run
- Starting program: /root/a.out
- Breakpoint 1, main () at test.c:15
- 15 int *p = &x.i;
- (gdb) print *p
- $1 = -1208203904
- (gdb) print p[0]
- $2 = -1208203904
- (gdb) n
- Breakpoint 2, main () at test.c:16
- 16 p[0] = 4;
- (gdb) n
- Breakpoint 3, main () at test.c:17
- 17 p[1] = 3;
- (gdb) n
- Breakpoint 4, main () at test.c:19
- 19 string s1="test";
- (gdb) print p[0]
- $3 = 4
- (gdb) print p[1]
- $4 = 3
- (gdb) print x.i
- $5 = 4
- (gdb) print *x.p
- $6 = 3
- (gdb) print x.p[0]
- $7 = 3
- (gdb) print x.p[1]
- $8 = -1073745012
- (gdb) print x.p[2]
- $9 = -1209019464
- (gdb) print s1
- $10 = {static npos = <optimized out>,
- _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>},
- _M_p = 0xb7fc7510 "\364", <incomplete sequence \374\267>}}
- (gdb) n
- Breakpoint 6, main () at test.c:21
- 21 if(!s1.empty())
- (gdb) n
- Breakpoint 7, main () at test.c:22
- 22 sprintf(msgBuffer, "s1:%s\n",s1.c_str());
- (gdb) print msgBuffer
- $11 = "\326\n\370\267\377\377\377\377,.\374\267\370K\374\267\000\000\000\000\334\363\377\277\364\357\377\267\030\371\377\267\001\000\000\000\000\000\000\000\213\302\376\267\320\372\377\267C0辗\001\000\000\000\001\000\000\000\000\000\000\000i,\365\267\244t\374\267\020u\374\267\200E\374\267\364_\354\267\000\000\000\000\001\000\000\000h\364\377\277\253\061辗\344c旆竤曳\000\000\000\000C0辗\001\000\000\000\226\061辗\364_\354\267%2辗\220\206\004\bP\240\004\bD\240\004\b\344c旆怽206\004\b\366\061辗\364\237\004\bS\211\004\b\220\206\004\bP\240\004\bD\240\004\b%2辗03\364\267\270\210\374\267\210\364\377\277o\211\004\b\001\000\000\000\377\377\000\000\001\000\000\000\r\206\004\b\344c旆竆210\374\267\001\000\000\000覊\004\b\001\000\000\000T\365\377\277\\\365\377\277%2辗p\322\376\267\000\000\000\000\211\211\004\b"
- (gdb) print msgBuffer[0]@256
- $12 = "\326\n\370\267\377\377\377\377,.\374\267\370K\374\267\000\000\000\000\334\363\377\277\364\357\377\267\030\371\377\267\001\000\000\000\000\000\000\000\213\302\376\267\320\372\377\267C0辗\001\000\000\000\001\000\000\000\000\000\000\000i,\365\267\244t\374\267\020u\374\267\200E\374\267\364_\354\267\000\000\000\000\001\000\000\000h\364\377\277\253\061辗\344c旆竤曳\000\000\000\000C0辗\001\000\000\000\226\061辗\364_\354\267%2辗\220\206\004\bP\240\004\bD\240\004\b\344c旆怽206\004\b\366\061辗\364\237\004\bS\211\004\b\220\206\004\bP\240\004\bD\240\004\b%2辗03\364\267\270\210\374\267\210\364\377\277o\211\004\b\001\000\000\000\377\377\000\000\001\000\000\000\r\206\004\b\344c旆竆210\374\267\001\000\000\000覊\004\b\001\000\000\000T\365\377\277\\\365\377\277%2辗p\322\376\267\000\000\000\000\211\211\004\b"
- (gdb) print s1.c_str()
- $13 = 0x804b014 "test"
- (gdb) n
- Breakpoint 8, main () at test.c:23
- 23 x.p[0]=5;
- (gdb) p x.p[0];
- Invalid character ';' in expression.
- (gdb) p x.p[0]
- $14 = 3
- (gdb) p x.p[1]
- $15 = -1073745012
- (gdb) n
- 24 printf("msgBuffer%s,%d\n", msgBuffer, x.i,x.p[0]);
- (gdb) p x.p[0]@255
- $16 = {5, -1073745012, -1209019464, -1208762682, -1208197132, -1208187308, 6, 0, -1210944584, -1209229312, 134524948, -1073745036,
- -1208191520, 1949970803, 175403877, -1208209920, -1208202248, 0, -1073744932, -1207963660, -1207961320, 1, 0, -1208040821,
- -1207960880, -1210765245, 1, 1, 0, -1208669079, -1208191836, -1208191728, -1208203904, -1209245708, 0, 1, -1073744792,
- -1210764885, -1209244700, -1210944584, 0, -1210765245, 1, -1210764906, -1209245708, -1210764763, 134514320, 134520912, 134520900,
- -1209244700, 134514320, -1210764810, 134520820, 134515027, 134514320, 134520912, 134520900, -1210764763, -1208732880, -1208186696,
- -1073744760, 134515055, 1, 65535, 1, 134514189, -1209244700, -1208186696, 1, 134515154, 1, -1073744556, -1073744548, -1210764763,
- -1208036752, 0, 134515081, 269330176, 134515072, -1209245708, 0, -1210870573, 1, -1073744556, -1073744548, -1208100768, 0,
- -1073744612, -1073744548, 0, 134513432, -1209245708, 0, 0, 0, 377269150, 1320947598, 0, 0, 0, 1, 134514480, 0, -1208015200,
- -1210870807, -1207963660, 1, 134514480, 0, 134514513, 134514660, 1, -1073744556, 134515072, 134515184, -1208036752, -1073744564,
- -1207961320, 1, -1073744183, 0, -1073744171, -1073744149, -1073744125, -1073744100, -1073744084, -1073744073, -1073744039,
- -1073743952, -1073743928, -1073743889, -1073743870, -1073743851, -1073743824, -1073743814, -1073743788, -1073742475, -1073742463,
- -1073742434, -1073742341, -1073742321, -1073742296, -1073742281, -1073742257, -1073742226, -1073742216, -1073742198, -1073742170,
- -1073742161, -1073742150, -1073742142, -1073742132, -1073742100, -1073742087, -1073742033, -1073742011, -1073741979, -1073741953,
- -1073741932, -1073741898, -1073741861, 0, 32, -7136, 33, -8192, 16, -1075053569, 6, 4096, 17, 100, 3, 134512692, 4, 32, 5, 9, 7,
- -1208098816, 8, 0, 9, 134514480, 11, 0, 12, 0, 13, 0, 14, 0, 23, 0, 25, -1073744213, 31, -1073741840, 15, -1073744197...}
- (gdb) quit
- A debugging session is active.
- Inferior 1 [process 3378] will be killed.
- Quit anyway? (y or n) y
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楼主: lsupper
发表于 2012-11-05 22:09
