If needed, use backslash to escape the meaning of special characters or quotes. Print the names and data types of all variables that are defined outside of functions i.
The printed variables are grouped by source files and annotated with their respective source line numbers. Like info variables , but only print the variables selected with the provided regexp s. If regexp is provided, print only the variables whose names match the regular expression regexp. List all Fortran modules in the program, or all modules matching the optional regular expression regexp.
List all functions or variables within all Fortran modules. The set of functions or variables listed can be limited by providing some or all of the optional regular expressions. If module-regexp is provided, then only Fortran modules matching module-regexp will be searched. Only functions or variables whose type matches the optional regular expression type-regexp will be listed. And only functions or variables whose name matches the optional regular expression regexp will be listed.
Display all Objective-C classes in your program, or with the regexp argument all those matching a particular regular expression. Display all Objective-C selectors in your program, or with the regexp argument all those matching a particular regular expression.
Tell GDB to resolve opaque types. The default is on. A change in the setting of this subcommand will not take effect until the next time symbols for a file are loaded. Tell GDB not to resolve opaque types. In this case, the type is printed as follows:. The set print symbol-loading command allows you to control the printing of messages when GDB loads symbol information.
By default a message is printed for the executable and one for each shared library, and normally this is what you want. However, when debugging apps with large numbers of shared libraries these messages can be annoying. When set to brief a message is printed for each executable, and when GDB loads a collection of shared libraries at once it will only print one message regardless of the number of shared libraries.
When set to off no messages are printed. Show whether messages will be printed when a GDB command entered from the keyboard causes symbol information to be loaded. Write a dump of debugging symbol data into the file filename or the terminal if filename is unspecified.
If -objfile objfile is specified, only dump symbols for that objfile. If -pc address is specified, only dump symbols for the file with code at that address. Note that address may be a symbol like main. If -source source is specified, only dump symbols for that source file.
These commands are used to debug the GDB symbol-reading code. You can use the command info sources to find out which files these are. If regexp is not given, list them all. The output includes expressions which you can copy into a GDB debugging this one to examine a particular structure in more detail.
If we set a breakpoint on a function, that will cause GDB to read the symtab for the compilation unit containing that function:. List the struct linetable from all struct symtab instances whose name matches regexp. If regexp is not given, list the struct linetable from all struct symtab. Set the size of the symbol cache to size. The default size is intended to be good enough for debugging most applications. This option exists to allow for experimenting with different sizes. Flush the contents of the symbol cache, all entries are removed.
This command is useful when debugging the symbol cache. It is also useful when collecting performance data. The command maint flush-symbol-cache is deprecated in favor of maint flush symbol-cache..
Symbol linebuffer is in static storage at address 0xa18, length 4. But embedded hardware is often resource constrained. For example, installing the unstripped executables can be prohibitively.
In my actual project, the whole project is composed of many executable and many shared libraries. While the production package is around 5Mb compressed, the unstripped version is around 70Mb and we only have 50Mb of flash space available. ELF objects are composed of sections that includes code. GDB can read symbol tables from other files, so one solution is to build the package as usual, perhaps with unoptimizing flags -O0 and with debug symbols -g and then split them in executable and debug symbol files.
This way code can installed, tested and used as usual and symbols only moved on board when needed. This article is divided in two sections: first how to automatize the creation of the debug package, then how to load the symbol tables into gdb. The recipe for this is the same on both the library and executables. First run objcopy to extract the symbol table and build the debug symbol file, then strip the object file.
This will create a new ELF object with just the symbol table. See this note from man obj-copy :. In ELF files, this preserves all note sections in the output. Note — the section headers of the stripped sections are preserved, including their sizes, but the of the section are discarded. The section headers are preserved so that other tools can match up the debuginfo file with the real executable, even if that executable has been relocated to a address space.
The latest can be copied on the board when needed, and loaded into dbg. I tried that but it is not loading the symbol files from said directory — Ibrar Ahmed. Do you load bar. Does it contian a debug link? Yes bar. I have symbol file of bar. In my case gdb searched not in the directory set to debug-file-directory itself, but in a subdirectory, which is the absolute path to the original file bar. Additional symbols can be loaded to the gdb debug session with: add-symbol-file filename address Parameter address is the address for.
Jaakko Jaakko 3, 2 2 gold badges 22 22 silver badges 19 19 bronze badges. Here is a version of add-symbol-file-auto that does not depend on a temporary file: stackoverflow.
You can find it by using the readelf command Here you have an example of a readelf use for binary files The address where filename has been loaded is missing [GDB]. Olivier Olivier 3 3 silver badges 11 11 bronze badges. Usage: add-symbol-file-auto FILE [-readnow -readnever] The necessary starting address of the file's text is resolved by 'readelf'. Simon Sobisch 5, 13 13 silver badges 35 35 bronze badges. Rob W Rob W k 77 77 gold badges silver badges bronze badges.
I don't like the tempfile either. I remember looking at Python but I think there was some limitation using python with that specific gdb version.
I've found this script very useful and adjusted it a bit to match add-symbol-file , hoping rob-w doesn't mind: added help, moved to gdb files it will be shown next to add-symbol-file in GDB's help , added don't-repeat, added file exist check for the original one please see the edit.
Note: instead of added to. Rahul Sreeram Rahul Sreeram 1 1 silver badge 8 8 bronze badges. Floern Frank Ren Frank Ren Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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