c | continue |
d | step-in |
b | flag frame for debugging when leaving frame again |
u | unflag frame for debugging when leaving |
j | flag frame and disable function-entry breakpoints |
e | eval expression in minibuffer |
q | quit |
r | eval expression and set it as value of frame, continue |
R | as r, but save to Debugger-record too |
l | list functions with breakpoints |
Debugger can’t step through primitive functions, i.w. ones written in C.
Compiled functions can’t be stepped through, either. To replace function with an interpreted version visit the source and hit C-M-x.