Class: IRB::Frame (Ruby 2.5.7)
Description: Class : IRB::Frame - Ruby 2.5.7

### Home Classes Methods

### In Files

- irb/frame.rb

### Parent

Object

### Methods

- ::bottom
- ::new
- ::sender
- ::top
- #bottom
- #top
- #trace_func

### Class/Module Index

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# IRB::Frame

### Constants

CALL_STACK_OFFSET

  Default number of frames offset

INIT_STACK_TIMES

  Default number of stack frames

### Public Class Methods

bottom(n = 0) click to toggle source

Convenience method for `Frame#bottom`

                   # File irb/frame.rb, line 62
    def Frame.bottom(n = 0)
      @backtrace.bottom(n)
    end

new() click to toggle source

Creates a new stack frame

                   # File irb/frame.rb, line 27
    def initialize
      @frames = [TOPLEVEL_BINDING] * INIT_STACK_TIMES
    end

sender() click to toggle source

Returns the binding context of the caller from the last frame initialized

                   # File irb/frame.rb, line 72
    def Frame.sender
      eval "self", @backtrace.top
    end

top(n = 0) click to toggle source

Convenience method for `Frame#top`

                   # File irb/frame.rb, line 67
    def Frame.top(n = 0)
      @backtrace.top(n)
    end

### Public Instance Methods

bottom(n = 0) click to toggle source

Returns the `n` number of frames on the call stack from the first frame initialized.

Raises FrameOverflow if there are no frames in the given stack range.

                   # File irb/frame.rb, line 55
    def bottom(n = 0)
      bind = @frames[n]
      Fail FrameOverflow unless bind
      bind
    end

top(n = 0) click to toggle source

Returns the `n` number of frames on the call stack from the last frame initialized.

Raises FrameUnderflow if there are no frames in the given stack range.

                   # File irb/frame.rb, line 45
    def top(n = 0)
      bind = @frames[-(n + CALL_STACK_OFFSET)]
      Fail FrameUnderflow unless bind
      bind
    end

trace_func(event, file, line, id, binding) click to toggle source

Used by Kernel#set_trace_func to register each event in the call stack

                   # File irb/frame.rb, line 32
    def trace_func(event, file, line, id, binding)
      case event
      when 'call', 'class'
        @frames.push binding
      when 'return', 'end'
        @frames.pop
      end
    end