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require "os/mac/architecture_list"
module CctoolsMachO
# @private
OTOOL_RX = /\t(.*) \(compatibility version (?:\d+\.)*\d+, current version (?:\d+\.)*\d+\)/
# Mach-O binary methods, see:
# /usr/include/mach-o/loader.h
# /usr/include/mach-o/fat.h
# @private
def mach_data
@mach_data ||= begin
offsets = []
mach_data = []
header = read(8).unpack("N2")
case header[0]
when 0xcafebabe # universal
header[1].times do |i|
# header[1] is the number of struct fat_arch in the file.
# Each struct fat_arch is 20 bytes, and the 'offset' member
# begins 8 bytes into the struct, with an additional 8 byte
# offset due to the struct fat_header at the beginning of
# the file.
offsets << read(4, 20*i + 16).unpack("N")[0]
end
when 0xcefaedfe, 0xcffaedfe, 0xfeedface, 0xfeedfacf # Single arch
offsets << 0
else
raise "Not a Mach-O binary."
end
offsets.each do |offset|
arch = case read(8, offset).unpack("N2")
when [0xcefaedfe, 0x07000000] then :i386
when [0xcffaedfe, 0x07000001] then :x86_64
when [0xfeedface, 0x00000012] then :ppc7400
when [0xfeedfacf, 0x01000012] then :ppc64
else :dunno
end
type = case read(4, offset + 12).unpack("N")[0]
when 0x00000002, 0x02000000 then :executable
when 0x00000006, 0x06000000 then :dylib
when 0x00000008, 0x08000000 then :bundle
else :dunno
end
mach_data << { :arch => arch, :type => type }
end
mach_data
rescue
[]
end
end
def archs
mach_data.map { |m| m.fetch :arch }.extend(ArchitectureListExtension)
end
def arch
case archs.length
when 0 then :dunno
when 1 then archs.first
else :universal
end
end
def universal?
arch == :universal
end
def i386?
arch == :i386
end
def x86_64?
arch == :x86_64
end
def ppc7400?
arch == :ppc7400
end
def ppc64?
arch == :ppc64
end
# @private
def dylib?
mach_data.any? { |m| m.fetch(:type) == :dylib }
end
# @private
def mach_o_executable?
mach_data.any? { |m| m.fetch(:type) == :executable }
end
# @private
def mach_o_bundle?
mach_data.any? { |m| m.fetch(:type) == :bundle }
end
# @private
class Metadata
attr_reader :path, :dylib_id, :dylibs
def initialize(path)
@path = path
@dylib_id, @dylibs = parse_otool_L_output
end
def parse_otool_L_output
args = ["-L", path.expand_path.to_s]
libs = Utils.popen_read(OS::Mac.otool, *args).split("\n")
unless $?.success?
raise ErrorDuringExecution.new(OS::Mac.otool, args)
end
libs.shift # first line is the filename
id = libs.shift[OTOOL_RX, 1] if path.dylib?
libs.map! { |lib| lib[OTOOL_RX, 1] }.compact!
return id, libs
end
end
# @private
def mach_metadata
@mach_metadata ||= Metadata.new(self)
end
# Returns an array containing all dynamically-linked libraries, based on the
# output of otool. This returns the install names, so these are not guaranteed
# to be absolute paths.
# Returns an empty array both for software that links against no libraries,
# and for non-mach objects.
# @private
def dynamically_linked_libraries
mach_metadata.dylibs
end
# @private
def dylib_id
mach_metadata.dylib_id
end
end
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