Lecture 8 Flashcards
What does the gdb Run
command do?
Execute the program
What does break do?
Sets a breakpoint, a place for the program to stop
What does next do?
Runs until the next instruction in the this function
What does step do?
Stops at the next instruction call anywhere
What does continue do?
run until the next breakpoint
What does print do?
show the value of a variable
What does set do?
Change the value of a variable
What does jump do?
Start executing at a different line number
What is enable/disable?
Turn breakpoints on or off
What is the anatomy of a running program?
Executable code of the program
Global Variables
Call Stack
Heap
What two parts of the anatomy of a running program are created at compile time?
Executable code of the program
Global Variables
What is the executable?
the instructions to run
What is the call stack?
where we track function calls
What is the heap?
where dynamic memory allocation happens. Space that lives beyond the end of a function.
What do we use the call stack for?
We use it to track which function we’re currently using.
What happens when we call a function?
- We create a stack frame for it
- Add the frame to the stack
What does the stack frame hold?
The instructions to execute in the calling function when the function ends
Hardware information
Register Values
Parameters for the function
Space for local variables in the function
What happens when a function ends?
The stack frame for the function is removed from the call stack, so all the information disappears.
How are startup information values provided to the program?
It’s provided as parameters to main()
One parameter to say how many items are passed to your program
One array of strings to hold all of the items passed to your program
Will a char hold unicode values?
No, it holds ascii values
Why? Because it’s only a byte
