https://zh.wikipedia.org/wiki/符号表

https://en.wikipedia.org/wiki/Symbol_table

在计算机科学中，符号表是一种用于语言翻译器（例如编译器和解释器）中的数据结构。在符号表中，程序源代码中的每个标识符都和它的声明或使用信息绑定在一起，比如其数据类型、作用域以及内存地址。

实现

散列表是用来实现符号表的一种常用技术。编译器可能会使用一个很大的符号表来包含所有的符号，或是针对不同的作用域使用层次结构的多个独立的符号表。

使用

目标文件中通常会有一个包含了所有外部可见标识符的符号表。在链接不同的目标文件时，链接器会使用这些文件中的符号表来解析所有未解析的符号引用。

符号表可能只存在于翻译阶段，也可能被嵌入到该阶段的输出文件中，以供后续阶段使用。比如，它可用于交互式的调试器中，也可以在程序执行过程中或结束后提供格式化的诊断报告。

在逆向工程中，许多任务具会通过符号表来检查全局变量和已知函数的地址。如果可执行文件的符号表被strip这样的工具去除掉了，则逆向工程会更加困难。

在进行动态内存分配和变量访问时，编译器需要完成许多任务作，其中扩展的栈模型就需要用到符号表。

示例

下图是一个小程序的符号表。该表是用GNU Binutils中的nm工具生成的。其中有一个数据类型符号（由类型 "D" 表明）和许多函数（自己定义的以及标准库中的）。第一列是每个符号在内存中的位置，第二列是"符号类型"，而第三列则是符号名称。通过传递适当的参数，可以按照地址顺序生成该符号表。

Example table
地址 类型 名称
00000020 a T_BIT
00000040 a F_BIT
00000080 a I_BIT
20000004 t irqvec
20000008 t fiqvec
2000000c t InitReset
20000018 T _main
20000024 t End
20000030 T AT91F_US3_CfgPIO_useB
2000005c t AT91F_PIO_CfgPeriph
200000b0 T main
20000120 T AT91F_DBGU_Printk
20000190 t AT91F_US_TxReady
200001c0 t AT91F_US_PutChar
200001f8 T AT91F_SpuriousHandler
20000214 T AT91F_DataAbort
20000230 T AT91F_FetchAbort
2000024c T AT91F_Undef
20000268 T AT91F_UndefHandler
20000284 T AT91F_LowLevelInit
200002e0 t AT91F_DBGU_CfgPIO
2000030c t AT91F_PIO_CfgPeriph
20000360 t AT91F_US_Configure
200003dc t AT91F_US_SetBaudrate
2000041c t AT91F_US_Baudrate
200004ec t AT91F_US_SetTimeguard
2000051c t AT91F_PDC_Open
2000059c t AT91F_PDC_DisableRx
200005c8 t AT91F_PDC_DisableTx
200005f4 t AT91F_PDC_SetNextTx
20000638 t AT91F_PDC_SetNextRx
2000067c t AT91F_PDC_SetTx
200006c0 t AT91F_PDC_SetRx
20000704 t AT91F_PDC_EnableRx
20000730 t AT91F_PDC_EnableTx
2000075c t AT91F_US_EnableTx
20000788 T __aeabi_uidiv
20000788 T __udivsi3
20000884 T __aeabi_uidivmod
2000089c T __aeabi_idiv0
2000089c T __aeabi_ldiv0
2000089c T __div0
200009a0 D _data
200009a0 A _etext
200009a0 D holaamigosh
200009a4 A __bss_end__
200009a4 A __bss_start
200009a4 A __bss_start__
200009a4 A _edata
200009a4 A _end

In computer science, a symbol table is a data structure used by a language translator such as a compiler or interpreter, where each identifier (a.k.a. symbol) in a program's source code is associated with information relating to its declaration or appearance in the source. In other words, the entries of a symbol table store the information related to the entry's corresponding symbol.

Example

Consider the following program written in C:

// Declare an external function

extern double bar(double x);

// Define a public function

double foo(int count)

{

    double sum = 0.0;

    // Sum all the values bar(1) to bar(count)

    for (int i = 1; i <= count; i++)

        sum += bar((double) i);

    return sum;

}

A C compiler that parses this code will contain at least the following symbol table entries:

Symbol name Type Scope
bar function, double extern
x double function parameter
foo function, double global
count int function parameter
sum double block local
i int for-loop statement

In addition, the symbol table will also contain entries generated by the compiler for intermediate expression values (e.g., the expression that casts the i loop variable into a double, and the return value of the call to function bar()), statement labels, and so forth.

https://baike.baidu.com/item/符号表

中文名
符号表
外文名
The symbol table
用    于
语言翻译器
属    性
数据结构
符号表在编译程序工作的过程中需要不断收集、记录和使用源程序中一些语法符号的类型和特征等相关信息。这些信息一般以表格形式存储于系统中。如常数表、变量名表、数组名表、过程名表、标号表等等，统称为符号表。对于符号表组织、构造和管理方法的好坏会直接影响编译系统的运行效率。
 
 
 
 
 
 

debugging – 如何在GDB中获取内存地址的符号名称？

时间: 2018-08-23 03:00:43.0
 
 
 
info address symbol

Describe where the data for symbol is stored. For a register variable, this says which register it is kept in. For a non-register local variable, this prints the stack-frame offset at which the variable is always stored.

Note the contrast with ‘print &symbol’, which does not work at all for a register variable, and for a stack local variable prints the exact address of the current instantiation of the variable.

info symbol addr

Print the name of a symbol which is stored at the address addr. If no symbol is stored exactly at addr, GDB prints the nearest symbol and an offset from it:

(gdb) info symbol 0x54320

_initialize_vx + 396 in section .text

This is the opposite of the info address command. You can use it to find out the name of a variable or a function given its address.

For dynamically linked executables, the name of executable or shared library containing the symbol is also printed:

(gdb) info symbol 0x400225

_start + 5 in section .text of /tmp/a.out

(gdb) info symbol 0x2aaaac2811cf

__read_nocancel + 6 in section .text of /usr/lib64/libc.so.6
 
[root@test-proxy-2 ~]# ps -ef | grep gun

root     16448     1  0 Nov08 ?        00:00:13 /mnt/venvs/proDev/bin/python3.7 /mnt/venvs/proDev/bin/gunicorn wsgi_prod:application --bind=0.0.0.0:8003 --workers=2 --timeout=300 -k gevent

root     16635 16448  0 Nov08 ?        00:00:17 /mnt/venvs/proDev/bin/python3.7 /mnt/venvs/proDev/bin/gunicorn wsgi_prod:application --bind=0.0.0.0:8003 --workers=2 --timeout=300 -k gevent

root     16636 16448  0 Nov08 ?        00:00:17 /mnt/venvs/proDev/bin/python3.7 /mnt/venvs/proDev/bin/gunicorn wsgi_prod:application --bind=0.0.0.0:8003 --workers=2 --timeout=300 -k gevent

root     18262 18154  0 21:04 pts/1    00:00:00 grep gun

[root@test-proxy-2 ~]# gdb --pid=16635

GNU gdb (GDB) Red Hat Enterprise Linux (7.2-92.el6)

Copyright (C) 2010 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 "x86_64-redhat-linux-gnu".

For bug reporting instructions, please see:

<http://www.gnu.org/software/gdb/bugs/>.

Attaching to process 16635

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[New LWP 17494]

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Loaded symbols for /lib64/libnss_dns.so.2

0x00007fc2e53dd243 in epoll_wait () from /lib64/libc.so.6

Missing separate debuginfos, use: debuginfo-install bzip2-libs-1.0.5-7.el6_0.x86_64 glibc-2.12-1.212.el6_10.3.x86_64 keyutils-libs-1.4-5.el6.x86_64 krb5-libs-1.10.3-65.el6.x86_64 libcom_err-1.41.12-24.el6.x86_64 libselinux-2.0.94-7.el6.x86_64 mysql-libs-5.1.73-8.el6_8.x86_64 nss-softokn-freebl-3.14.3-23.3.el6_8.x86_64 openssl-1.0.1e-58.el6_10.x86_64 zlib-1.2.3-29.el6.x86_64

(gdb) backtrace

#0  0x00007fc2e53dd243 in epoll_wait () from /lib64/libc.so.6

#1  0x00007fc2dafe3595 in epoll_poll (loop=0x7fc2db2022c0, timeout=<value optimized out>) at /tmp/build/gevent/deps/libev/ev_epoll.c:153

#2  0x00007fc2dafed47e in ev_run (loop=0x7fc2db2022c0, flags=Unhandled dwarf expression opcode 0xf3

) at /tmp/build/gevent/deps/libev/ev.c:3683

#3  0x00007fc2dafedfaa in __pyx_pf_6gevent_5libev_8corecext_4loop_14run (__pyx_v_self=0x7fc2d957dd50, __pyx_args=Unhandled dwarf expression opcode 0xf3

) at src/gevent/libev/corecext.c:6882

#4  __pyx_pw_6gevent_5libev_8corecext_4loop_15run (__pyx_v_self=0x7fc2d957dd50, __pyx_args=Unhandled dwarf expression opcode 0xf3

) at src/gevent/libev/corecext.c:6842

#5  0x0000000000430223 in _PyMethodDef_RawFastCallKeywords (method=<value optimized out>, self=0x7fc2d957dd50, args=0x7fc2d5b657b0, nargs=0, kwnames=<value optimized out>)

    at Objects/call.c:694

#6  0x000000000059dbae in _PyMethodDescr_FastCallKeywords (descrobj=<value optimized out>, args=0x7fc2d5b657a8, nargs=1, kwnames=0x0) at Objects/descrobject.c:288

#7  0x00000000004da001 in call_function (f=<value optimized out>, throwflag=<value optimized out>) at Python/ceval.c:4593

#8  _PyEval_EvalFrameDefault (f=<value optimized out>, throwflag=<value optimized out>) at Python/ceval.c:3110

#9  0x00000000004325d4 in function_code_fastcall (co=<value optimized out>, args=<value optimized out>, nargs=1, globals=<value optimized out>) at Objects/call.c:283

#10 0x00000000004309fe in _PyFunction_FastCallDict (func=0x7fc2dafa95f0, args=<value optimized out>, nargs=<value optimized out>, kwargs=0x0) at Objects/call.c:322

#11 0x000000000043129c in _PyObject_Call_Prepend (callable=0x7fc2dafa95f0, obj=0x7fc2d92851d0, args=0x7fc2e6541050, kwargs=0x0) at Objects/call.c:908

#12 0x0000000000431632 in PyObject_Call (callable=0x7fc2d9294d70, args=<value optimized out>, kwargs=<value optimized out>) at Objects/call.c:245

#13 0x00007fc2dab5a667 in g_initialstub (mark=Unhandled dwarf expression opcode 0xf3

) at greenlet.c:823

#14 0x00007fc2dab59ff6 in g_switch (target=0x7fc2d92851d0, args=0x7fc2e6541050, kwargs=Unhandled dwarf expression opcode 0xf3

) at greenlet.c:597

#15 0x00007fc2dab5af5b in PyGreenlet_Switch (g=0x7fc2d92851d0, args=0x7fc2e6541050, kwargs=0x0) at greenlet.c:1441

#16 0x00007fc2da95071f in __pyx_f_6gevent_21__greenlet_primitives__greenlet_switch (__pyx_v_self=0x7fc2d92851d0, __pyx_skip_dispatch=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_greenlet_primitives.c:2679

#17 __pyx_f_6gevent_21__greenlet_primitives_25SwitchOutGreenletWithLoop_switch (__pyx_v_self=0x7fc2d92851d0, __pyx_skip_dispatch=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_greenlet_primitives.c:1958

#18 0x00007fc2da950dce in __pyx_pf_6gevent_21__greenlet_primitives_25SwitchOutGreenletWithLoop_switch (__pyx_v_self=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_greenlet_primitives.c:2008

#19 __pyx_pw_6gevent_21__greenlet_primitives_25SwitchOutGreenletWithLoop_1switch (__pyx_v_self=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_greenlet_primitives.c:1995

#20 0x00007fc2dad65b9e in __Pyx_CyFunction_CallMethod (func=0x7fc2db687650, args=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_local.c:4407

#21 __Pyx_CyFunction_CallAsMethod (func=0x7fc2db687650, args=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_local.c:4465

#22 0x00007fc2da94ebf9 in __Pyx_PyObject_Call (func=0x7fc2db687650, arg=0x7fc2d42e1150, kw=0x0) at src/gevent/_greenlet_primitives.c:4024

#23 0x00007fc2da94bba5 in __Pyx__PyObject_CallOneArg (func=0x7fc2db687650, arg=0x7fc2d92851d0) at src/gevent/_greenlet_primitives.c:4092

#24 0x00007fc2da94fe6b in __Pyx_PyObject_CallOneArg (func=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_greenlet_primitives.c:4111

#25 0x00007fc2da950d64 in __pyx_f_6gevent_21__greenlet_primitives_25SwitchOutGreenletWithLoop_switch (__pyx_v_self=0x7fc2d92851d0, __pyx_skip_dispatch=Unhandled dwarf expression opcode 0xf3

)

    at src/gevent/_greenlet_primitives.c:1867

#26 0x00007fc2da73f483 in __pyx_f_6gevent_8__waiter_6Waiter_get (__pyx_v_self=0x7fc2d4fe0bf0, __pyx_skip_dispatch=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_waiter.c:3309

#27 0x00007fc2da529a31 in __pyx_f_6gevent_16__hub_primitives_22WaitOperationsGreenlet_wait (__pyx_v_self=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_primitives.c:2120

#28 0x00007fc2da52adfe in __pyx_pf_6gevent_16__hub_primitives_22WaitOperationsGreenlet_wait (__pyx_v_self=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_primitives.c:2351

#29 __pyx_pw_6gevent_16__hub_primitives_22WaitOperationsGreenlet_1wait (__pyx_v_self=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_primitives.c:2338

#30 0x00007fc2dad65a7f in __Pyx_CyFunction_CallMethod (func=0x7fc2daf7bb90, args=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_local.c:4424

#31 __Pyx_CyFunction_CallAsMethod (func=0x7fc2daf7bb90, args=Unhandled dwarf expression opcode 0xf3

) at src/gevent/_hub_local.c:4465

#32 0x0000000000431fb5 in _PyObject_FastCallKeywords (callable=0x7fc2daf7bb90, stack=0x245ea68, nargs=<value optimized out>, kwnames=0x0) at Objects/call.c:199

#33 0x00000000004d8ff5 in call_function (f=<value optimized out>, throwflag=<value optimized out>) at Python/ceval.c:4619

#34 _PyEval_EvalFrameDefault (f=<value optimized out>, throwflag=<value optimized out>) at Python/ceval.c:3093

#35 0x00000000004d0039 in PyEval_EvalFrameEx (_co=0x7fc2daf85930, globals=<value optimized out>, locals=<value optimized out>, args=<value optimized out>, argcount=1,

    kwnames=0x0, kwargs=0x2237100, kwcount=0, kwstep=1, defs=0x7fc2daf9fa18, defcount=2, kwdefs=0x0, closure=0x0, name=0x7fc2defc52f0, qualname=0x7fc2defc52f0)

    at Python/ceval.c:547

#36 _PyEval_EvalCodeWithName (_co=0x7fc2daf85930, globals=<value optimized out>, locals=<value optimized out>, args=<value optimized out>, argcount=1, kwnames=0x0,

    kwargs=0x2237100, kwcount=0, kwstep=1, defs=0x7fc2daf9fa18, defcount=2, kwdefs=0x0, closure=0x0, name=0x7fc2defc52f0, qualname=0x7fc2defc52f0) at Python/ceval.c:3930

#37 0x00000000004306d7 in _PyFunction_FastCallKeywords (func=<value optimized out>, stack=<value optimized out>, nargs=<value optimized out>, kwnames=<value optimized out>)

    at Objects/call.c:433

#38 0x00000000004d97cc in call_function (f=<value optimized out>, throwflag=<value optimized out>) at Python/ceval.c:4616

#39 _PyEval_EvalFrameDefault (f=<value optimized out>, throwflag=<value optimized out>) at Python/ceval.c:3093

#40 0x00000000004325d4 in function_code_fastcall (co=<value optimized out>, args=<value optimized out>, nargs=1, globals=<value optimized out>) at Objects/call.c:283

---Type <return> to continue, or q <return> to quit---q

Quit

(gdb) info symbol 0x00007fc2e53dd243

epoll_wait + 51 in section .text of /lib64/libc.so.6

(gdb) info address epoll_poll

Symbol "epoll_poll" is a function at address 0x7fc2dafe3540.

(gdb) info address epoll_wait

Symbol "epoll_wait" is at 0x7fc2e53dd210 in a file compiled without debugging.

(gdb) info symbol 0x00007fc2e53dd243

epoll_wait + 51 in section .text of /lib64/libc.so.6

(gdb) info address epoll_wait

Symbol "epoll_wait" is at 0x7fc2e53dd210 in a file compiled without debugging.

(gdb) info address epoll_poll

Symbol "epoll_poll" is a function at address 0x7fc2dafe3540.

(gdb) info symbol 0x00007fc2dafe3595

epoll_poll + 85 in section .text of /mnt/venvs/proDev/lib/python3.7/site-packages/gevent/libev/corecext.cpython-37m-x86_64-linux-gnu.so

(gdb) q

A debugging session is active.

        Inferior 1 [process 16635] will be detached.

Quit anyway? (y or n) y

Detaching from program: /mnt/venvs/proDev/bin/python3.7, process 16635

[root@test-proxy-2 ~]#

　　

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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