instance method

Exception#backtrace

() -> ::Array[::String]?

backtrace → array or nil

static VALUE
exc_backtrace(VALUE exc)
{
    VALUE obj;

    obj = rb_attr_get(exc, id_bt);

    if (rb_backtrace_p(obj)) {
        obj = rb_backtrace_to_str_ary(obj);
        /* rb_ivar_set(exc, id_bt, obj); */
    }

    return obj;
}

Returns the backtrace (the list of code locations that led to the exception), as an array of strings.

Example (assuming the code is stored in the file named t.rb):

Example

def division(numerator, denominator)
  numerator / denominator
end

begin
  division(1, 0)
rescue => ex
  p ex.backtrace
  # ["t.rb:2:in 'Integer#/'", "t.rb:2:in 'Object#division'", "t.rb:6:in '<main>'"]
  loc = ex.backtrace.first
  p loc.class
  # String
end

The value returned by this method might be adjusted when raising (see Kernel#raise), or during intermediate handling by set_backtrace.

See also backtrace_locations that provide the same value, as structured objects. (Note though that two values might not be consistent with each other when backtraces are manually adjusted.)

see Backtraces.

See also #as_json #backtrace_locations #== #cause also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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