The usual way to examine data in your program is with the print command (abbreviated p ), or its synonym inspect . It evaluates and prints the value of an expression of the language your program is written in (see section Using GDB with Different Languages). expr is an expression (in the source language).
Where does GDB look for source files?
GDB would look for the source file in the following locations: /usr/src/foo-1.0/lib/foo. c. /mnt/cross/usr/src/foo-1.0/lib/foo.
Which command is used to display the source code for the current file?
Use the “file” command. You must compile the program with debug information in order to see the source code while debugging.
How do I see more lines in GDB?
By default, GDB prints ten source lines with any of these forms of the list command. You can change this using set listsize : set listsize count. Make the list command display count source lines (unless the list argument explicitly specifies some other number).
Which command is used to print the value of variable?
disp( X ) displays the value of variable X without printing the variable name. Another way to display a variable is to type its name, which displays a leading “ X = ” before the value.
What GDB command would you need to call to print the value?
print command
Prints the value of a given expression.
How do I set up GDB?
The simplest way to configure and build GDB is to run configure from the `gdb- version-number ‘ source directory, which in this example is the `gdb-5.1. 1’ directory. First switch to the `gdb- version-number ‘ source directory if you are not already in it; then run configure .
How do I connect to a GDB server?
The basic procedure for connecting to the remote target is:
- Run GDB on the host system.
- Make sure you have the necessary symbol files (see Host and target files). Load symbols for your application using the file command before you connect.
- Connect to your target (see Connecting to a Remote Target).
What is L in GDB?
To print lines from a source file, use the list command (abbreviated l ). By default, ten lines are printed. There are several ways to specify what part of the file you want to print; see Specify Location, for the full list.
What is frame in GDB?
The frame contains the arguments given to the function, the function’s local variables, and the address at which the function is executing. When your program is started, the stack has only one frame, that of the function main . This is called the initial frame or the outermost frame.
How do I use BT in gdb?
To print a backtrace of the entire stack, use the backtrace command, or its alias bt . This command will print one line per frame for frames in the stack. By default, all stack frames are printed. You can stop the backtrace at any time by typing the system interrupt character, normally Ctrl-c .
What is L in gdb?
How do I print the source file in gdb?
You can print other portions of source files by explicit command. If you use GDB through its GNU Emacs interface, you may prefer to use Emacs facilities to view source; see section Using GDB under GNU Emacs. Printing source lines
How do I change the number of source lines in gdb?
By default, GDB prints ten source lines with any of these forms of the listcommand. You can change this using set listsize: set listsize count Make the listcommand display countsource lines (unless the listargument explicitly specifies some other number). show listsize Display the number of lines that listprints.
How does GDB print the line where execution has stopped?
When your program stops, GDB spontaneously prints the line where it stopped. Likewise, when you select a stack frame (see section Selecting a frame), GDB prints the line where execution in that frame has stopped.
How does GDB search for source files?
GDB has a list of directories to search for source files; this is called the source path. Each time GDB wants a source file, it tries all the directories in the list, in the order they are present in the list, until it finds a file with the desired name. Note that the executable search path is not used for this purpose.
