lldb调试redis

lldb调试redis步骤

1、编译redis并启动redis服务
「目前位于redis源码目录」

1	make && ./src/redis-server &

2、lldb调试redis-cli

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lldb src/redis-cli
(lldb) target create "src/redis-cli"
Current executable set to 'src/redis-cli' (x86_64).

4、设置断点
注：「redis-cli.c文件的第986行，redis版本为：3.0.2」，第986行代码如下

1	-> 986 if (line[0] != '\0') {

1 2	(lldb) b redis-cli.c:986 Breakpoint 1: where = redis-cli`main + 11728 [inlined] repl + 74 at redis-cli.c:2288, address = 0x00000001000081b0

5、运行redis-cli

(lldb) process launch
P
Process 7181 launched: '/Users/sunnysmilez/Desktop/code/redis-3.0.2/src/redis-cli' (x86_64)
P

6、执行redis命令
注「使用ctrl+c进去信号处理器」

127.0.0.1:6379> SET KEY MS
                           Process 7181 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x00007fff52bf4142 libsystem_kernel.dylib`read + 10
libsystem_kernel.dylib`read:
->  0x7fff52bf4142 <+10>: jae    0x7fff52bf414c            ; <+20>
    0x7fff52bf4144 <+12>: movq   %rax, %rdi
    0x7fff52bf4147 <+15>: jmp    0x7fff52be9b0e            ; cerror
    0x7fff52bf414c <+20>: retq
Target 1: (redis-cli) stopped.

7、使用c命令进入断点
注：「c也就是continue命令」

(lldb) c
Process 7181 resuming
redis-cli was compiled with optimization - stepping may behave oddly; variables may not be available.
Process 7181 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x00000001000081b0 redis-cli`main [inlined] repl at redis-cli.c:986 [opt]
   983
   984 	    cliRefreshPrompt();
   985 	    while((line = linenoise(context ? config.prompt : "not connected> ")) != NULL) {
-> 986 	        if (line[0] != '\0') {
   987 	            argv = sdssplitargs(line,&argc);
   988 	            if (history) linenoiseHistoryAdd(line);
   989 	            if (historyfile) linenoiseHistorySave(historyfile);
Target 1: (redis-cli) stopped.

8、使用n向下执行

(lldb) n
Process 7181 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x00000001000081bb redis-cli`main [inlined] repl at redis-cli.c:987 [opt]
   984 	    cliRefreshPrompt();
   985 	    while((line = linenoise(context ? config.prompt : "not connected> ")) != NULL) {
   986 	        if (line[0] != '\0') {
-> 987 	            argv = sdssplitargs(line,&argc);
   988 	            if (history) linenoiseHistoryAdd(line);
   989 	            if (historyfile) linenoiseHistorySave(historyfile);
   990
Target 1: (redis-cli) stopped.
(lldb) n
Process 7181 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x00000001000081d2 redis-cli`main [inlined] repl at redis-cli.c:988 [opt]
   985 	    while((line = linenoise(context ? config.prompt : "not connected> ")) != NULL) {
   986 	        if (line[0] != '\0') {
   987 	            argv = sdssplitargs(line,&argc);
-> 988 	            if (history) linenoiseHistoryAdd(line);
   989 	            if (historyfile) linenoiseHistorySave(historyfile);
   990
   991 	            if (argv == NULL) {
Target 1: (redis-cli) stopped.
(lldb) n
Process 7181 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x00000001000081df redis-cli`main [inlined] repl at redis-cli.c:989 [opt]
   986 	        if (line[0] != '\0') {
   987 	            argv = sdssplitargs(line,&argc);
   988 	            if (history) linenoiseHistoryAdd(line);
-> 989 	            if (historyfile) linenoiseHistorySave(historyfile);
   990
   991 	            if (argv == NULL) {
   992 	                printf("Invalid argument(s)\n");
Target 1: (redis-cli) stopped.
(lldb) n
Process 7181 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x00000001000081e7 redis-cli`main [inlined] repl at redis-cli.c:991 [opt]
   988 	            if (history) linenoiseHistoryAdd(line);
   989 	            if (historyfile) linenoiseHistorySave(historyfile);
   990
-> 991 	            if (argv == NULL) {
   992 	                printf("Invalid argument(s)\n");
   993 	                free(line);
   994 	                continue;
Target 1: (redis-cli) stopped.

9、使用p打印值

(lldb) p *argv
(sds) $0 = 0x0000000100203e88 "SET"
(lldb) p *(argv+1)
(sds) $1 = 0x0000000100203ed8 "KEY"
(lldb) p *(argv+2)
(sds) $2 = 0x0000000100203ee8 "MS"
(lldb) p line
(char *) $3 = 0x0000000100202ef0 "SET KEY MS\n"

10、结束

使用n和p去查看你想要看到的一切值吧