/usr/lib/swipl/library/prolog_stack.pl
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 get_prolog_backtrace(+MaxDepth, -Backtrace) is det
 get_prolog_backtrace(+MaxDepth, -Backtrace, +Options) is det
Obtain a backtrace from the current location. The backtrace is a list of frames. Each frame is an opaque term that can be inspected using the predicate prolog_stack_frame_property/2 can be used to extract information from these frames. Most use scenarios will pass the stack to print_prolog_backtrace/2. The following options are provided:
frame(+Frame)
Start at Frame instead of the current frame.
goal_depth(+Depth)
If Depth > 0, include a shallow copy of the goal arguments into the stack. Default is set by the Prolog flag backtrace_goal_depth, set to 2 initially, showing the goal and toplevel of any argument.
guard(+Guard)
Do not show stack frames above Guard. See stack_guard/1.
Arguments:
Frame- is the frame to start from. See prolog_current_frame/1.
MaxDepth- defines the maximum number of frames returned.
Compatibility
- get_prolog_backtrace/3 used to have the parameters +Frame, +MaxDepth, -Backtrace. A call that matches this signature is mapped to get_prolog_backtrace(MaxDepth, Backtrace, [frame(Frame)]).