When you debug, you can examine your program as it steps into functions that you do not have source code for; for example, printf(). Normally, the debugger steps over these functions, even when you use the Step Into menu item. When the instruction pointer enters functions that it does not have the source code for, the IDE displays the function in the Assembly Editor.
To step into assembler functions during a debug
In Debug view, click the Disassembly Mode On/Off button.
As you step into assembler functions, the IDE displays the execution trace in the Assembly Editor.