Thread::Backtrace::Location

Class

An object representation of a stack frame, initialized by Kernel#caller_locations.

For example:

# caller_locations.rb
def a(skip)
  caller_locations(skip)
end
def b(skip)
  a(skip)
end
def c(skip)
  b(skip)
end

c(0..2).map do |call|
  puts call.to_s
end

Running ruby caller_locations.rb will produce:

caller_locations.rb:2:in `a'
caller_locations.rb:5:in `b'
caller_locations.rb:8:in `c'

Here’s another example with a slightly different result:

# foo.rb
class Foo
  attr_accessor :locations
  def initialize(skip)
    @locations = caller_locations(skip)
  end
end

Foo.new(0..2).locations.map do |call|
  puts call.to_s
end

Now run ruby foo.rb and you should see:

init.rb:4:in `initialize'
init.rb:8:in `new'
init.rb:8:in `<main>'

Instance Methods

absolute_path

vm_backtrace.c View on GitHub

          
            static VALUE
location_absolute_path_m(VALUE self)
{
    return location_absolute_path(location_ptr(self));
}

Returns the full file path of this frame.

Same as path, but includes the absolute path.

base_label

vm_backtrace.c View on GitHub

          
            static VALUE
location_base_label_m(VALUE self)
{
    return location_base_label(location_ptr(self));
}

Returns the base label of this frame.

Usually same as label, without decoration.

inspect

vm_backtrace.c View on GitHub

          
            static VALUE
location_inspect_m(VALUE self)
{
    return rb_str_inspect(location_to_str(location_ptr(self)));
}

Returns the same as calling inspect on the string representation of to_str

label

vm_backtrace.c View on GitHub

          
            static VALUE
location_label_m(VALUE self)
{
    return location_label(location_ptr(self));
}

Returns the label of this frame.

Usually consists of method, class, module, etc names with decoration.

Consider the following example:

def foo
  puts caller_locations(0).first.label

  1.times do
    puts caller_locations(0).first.label

    1.times do
      puts caller_locations(0).first.label
    end

  end
end

The result of calling foo is this:

label: foo
label: block in foo
label: block (2 levels) in foo

lineno

vm_backtrace.c View on GitHub

          
            static VALUE
location_lineno_m(VALUE self)
{
    return INT2FIX(location_lineno(location_ptr(self)));
}

Returns the line number of this frame.

For example, using caller_locations.rb from Thread::Backtrace::Location

loc = c(0..1).first
loc.lineno #=> 2

path

vm_backtrace.c View on GitHub

          
            static VALUE
location_path_m(VALUE self)
{
    return location_path(location_ptr(self));
}

Returns the file name of this frame.

For example, using caller_locations.rb from Thread::Backtrace::Location

loc = c(0..1).first
loc.path #=> caller_locations.rb

to_s

vm_backtrace.c View on GitHub

          
            static VALUE
location_to_str_m(VALUE self)
{
    return location_to_str(location_ptr(self));
}

Returns a Kernel#caller style string representing this frame.