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Top Forums Programming gdb - loading symbols of shared library Post 302245984 by rimon on Sunday 12th of October 2008 07:01:59 AM
Old 10-12-2008
gdb - loading symbols of shared library

I am debugging in gdb a program that dynamically loads libodbcinst.so. I want to debug the code from libodbcinst - I can break in it, see the source and step through it, but whenever I try printing a variable, I get (e.g. for the variable ret):
Code:
No symbol "ret" in current context.

In my program libodbcinst.so loads my own library (an odbc driver). This library I can debug fully, symbols and all.
Things I've verified:
- libodbcinst.so is compiled with debug information. I compiled it myself from UnixODBC sources, and made sure it was compiled with debug info.
- libodcinst.so is not stripped - I ran 'nm' on it, and got a symbol table.
- From gdb I ran 'info share' and saw that libodbcinst.so was in the list of loaded libraries. I also tried running 'sharedlibrary libodbcinst.so' but this made no difference.
- I tried running add-symbol-file for the library. I must admit I have a problem here. This command is supposed to receive an 'address' parameter. The manual says this should be the address where the library was loaded. How do I know that library? I tried putting different things there - for example the address of the text segment I got from 'maint info sections', but not only could I still not see the symbols, this also screwed up something with the rest of the debugging.

So, in addition to a solution to show the symbols, I would also be very grateful for an explanation of the address parameter for add-symbol-file.

I'm working on HP-UX 11.23 (Itanium). Using HP gdb (wdb) 5.7 .

TIA!

RO
 

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syms(5) 							File Formats Manual							   syms(5)

Name
       syms - MIPS symbol table

Syntax
       #include < sym.h>
       #include < symconst.h>

Description
       Unlike the COFF symbol table, the MIPS symbol table consists of many tables unbundling information.  The symbol table should be viewed as a
       network-style database designed for space and access efficiency.

       The following structures or tables appear in the MIPS symbol table:

       TABLE			CONTENTS

       Symbolic header		Sizes and locations of all other tables

       File descriptors 	Per file locations for other tables

       Procedure descriptors
				Frame information and location of procedure info

       Local symbols		Local type, local variable, and scoping info

       Local strings		String space for local symbols

       Line numbers		Compacted by encoding, contains a line per instruction

       Relative file descriptors
				Indirection for interfile symbol access

       Optimization symbols
				To be defined

       Auxiliary symbols	Variable data type information for each local symbol

       External symbols 	Loader symbols (global text and data)

       External strings 	String space for external symbols

       Dense numbers		Index pairs (file, symbol) for compiler use

       External and local symbols contain the standard concept of a symbol as follows:
       struct
       {
	    long iss; /* index into string space */
	    long value;    /* address, size, etc., depends on sc and st */
	    unsigned  st: 6;	/* symbol type (e.g. local, param, etc.) */
	    unsigned  sc: 5;	/* storage class (e.g. text, bss, etc.) */
	    unsigned  reserved: 1;
	    unsigned  index;	/* index to symbol or auxiliary tables */
       };

See Also
       ldfcn(5)

								       RISC								   syms(5)
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