Class: DEBUGGER__::MethodBreakpoint

Inherits:
Breakpoint show all
Defined in:
lib/debug/breakpoint.rb

Instance Attribute Summary collapse

Attributes inherited from Breakpoint

#key, #skip_src

Instance Method Summary collapse

Methods inherited from Breakpoint

#delete, #deleted?, #description, #disable, #duplicable?, #enabled?, #generate_label, #oneshot?, #safe_eval, #skip_path?, #suspend

Methods included from Color

#color_pp, #colored_inspect, #colorize, #colorize_blue, #colorize_code, #colorize_cyan, #colorize_dim, #colorize_magenta, #irb_colorize, #with_inspection_error_guard

Methods included from SkipPathHelper

#skip_config_skip_path?, #skip_internal_path?, #skip_location?, #skip_path?

Constructor Details

#initialize(b, klass_name, op, method_name, cond: nil, command: nil, path: nil) ⇒ MethodBreakpoint

Returns a new instance of MethodBreakpoint.



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# File 'lib/debug/breakpoint.rb', line 430

def initialize b, klass_name, op, method_name, cond: nil, command: nil, path: nil
  @sig_klass_name = klass_name
  @sig_op = op
  @sig_method_name = method_name
  @klass_eval_binding = b
  @override_method = false

  @klass = nil
  @method = nil
  @cond_class = nil
  @key = "#{klass_name}#{op}#{method_name}".freeze

  super(cond, command, path, do_enable: false)
end

Instance Attribute Details

#klass ⇒ Object (readonly)

Returns the value of attribute klass.



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# File 'lib/debug/breakpoint.rb', line 428

def klass
  @klass
end

#method ⇒ Object (readonly)

Returns the value of attribute method.



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# File 'lib/debug/breakpoint.rb', line 428

def method
  @method
end

#sig_method_name ⇒ Object (readonly)

Returns the value of attribute sig_method_name.



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# File 'lib/debug/breakpoint.rb', line 428

def sig_method_name
  @sig_method_name
end

Instance Method Details

#enable ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 475

def enable
  try_enable
end

#eval_class_name ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 457

def eval_class_name
  return @klass if @klass
  @klass = @klass_eval_binding.eval(@sig_klass_name)
  @klass_eval_binding = nil
  @klass
end

#override(klass) ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 480

def override klass
  sig_method_name = @sig_method_name
  klass.prepend Module.new{
    define_method(sig_method_name) do |*args, &block|
      super(*args, &block)
    end
  }
end

#search_method ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 464

def search_method
  case @sig_op
  when '.'
    @method = @klass.method(@sig_method_name)
  when '#'
    @method = @klass.instance_method(@sig_method_name)
  else
    raise "Unknown op: #{@sig_op}"
  end
end

#setup ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 445

def setup
  @tp = TracePoint.new(:call){|tp|
    next if !safe_eval(tp.binding, @cond) if @cond
    next if @cond_class && !tp.self.kind_of?(@cond_class)

    caller_location = caller_locations(2, 1).first.to_s
    next if skip_path?(caller_location)

    suspend
  }
end

#sig ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 543

def sig
  @key
end

#to_s ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 547

def to_s
  if @method
    loc = @method.source_location || []
    "#{generate_label("Method")} #{sig} at #{loc.join(':')}"
  else
    "#{generate_label("Method (pending)")} #{sig}"
  end + super
end

#try_enable(added: false) ⇒ Object 



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# File 'lib/debug/breakpoint.rb', line 499

def try_enable added: false
  eval_class_name
  search_method

  begin
    retried = false

    @tp.enable(target: @method)
    DEBUGGER__.info "#{self} is activated." if added

    if @sig_op == '#'
      @cond_class = @klass if @method.owner != @klass
    else # '.'
      begin
        @cond_class = @klass.singleton_class if @method.owner != @klass.singleton_class
      rescue TypeError
      end
    end

  rescue ArgumentError
    raise if retried
    retried = true

    # maybe C method
    case @sig_op
    when '.'
      begin
        override @klass.singleton_class
      rescue TypeError
        override @klass.class
      end
    when '#'
      override @klass
    end

    # re-collect the method object after the above patch
    search_method
    @override_method = true if @method
    retry
  end
rescue Exception
  raise unless added
end