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#! /usr/bin/env ruby
# frozen_string_literal: true
#
# examine the nokogiri dll for external symbols that shouldn't be there
#
# this assumes that we're on a linux machine, and that nokogiri.so, libxml2.a, libxslt.a, and
# libexslt.a exist and can be found under the pwd.
#
require "set"
def find_that_file(glob)
Dir.glob(glob).first || raise("could not find #{glob}")
end
def find_symbols(archive, flavor)
%x(nm #{archive}).split("\n").grep(/ #{flavor} /).each_with_object(Set.new) do |line, set|
set.add(line.split(/\s/).last)
end
end
def external_symbols(archive)
find_symbols(archive, "T")
end
def local_symbols(archive)
find_symbols(archive, "t")
end
noko_so = find_that_file("lib/**/nokogiri.so")
libxml2_archive = find_that_file("ports/**/libxml2.a")
libxslt_archive = find_that_file("ports/**/libxslt.a")
libexslt_archive = find_that_file("ports/**/libexslt.a")
libgumbo_archive = find_that_file("tmp/**/libgumbo.a")
symbols = external_symbols(noko_so)
symbols -= external_symbols(libxml2_archive)
symbols -= external_symbols(libxslt_archive)
symbols -= external_symbols(libexslt_archive)
symbols -= external_symbols(libgumbo_archive)
puts "#{noko_so} exports the following surprising symbols:"
symbols.to_a.sort.each do |symbol|
next if symbol == "Init_nokogiri"
next if /^Nokogiri_/.match?(symbol)
next if /^noko_/.match?(symbol)
puts "- #{symbol}"
end
symbols = local_symbols(noko_so)
puts "#{noko_so} has the following surprising local symbols:"
symbols.to_a.sort.each do |symbol|
puts "- #{symbol}" if /^noko_|^Nokogiri_/.match?(symbol)
end
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