This commit is contained in:
@@ -0,0 +1,232 @@
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require 'tempfile'
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require 'open3'
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module FFI
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# ConstGenerator turns C constants into ruby values.
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#
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# @example a simple example for stdio
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# require 'ffi/tools/const_generator'
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# cg = FFI::ConstGenerator.new('stdio') do |gen|
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# gen.const(:SEEK_SET)
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# gen.const('SEEK_CUR')
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# gen.const('seek_end') # this constant does not exist
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# end # #calculate called automatically at the end of the block
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#
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# cg['SEEK_SET'] # => 0
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# cg['SEEK_CUR'] # => 1
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# cg['seek_end'] # => nil
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# cg.to_ruby # => "SEEK_SET = 0\nSEEK_CUR = 1\n# seek_end not available"
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class ConstGenerator
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@options = {}
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attr_reader :constants
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# Creates a new constant generator that uses +prefix+ as a name, and an
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# options hash.
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#
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# The only option is +:required+, which if set to +true+ raises an error if a
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# constant you have requested was not found.
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#
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# @param [#to_s] prefix
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# @param [Hash] options
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# @return
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# @option options [Boolean] :required
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# @overload initialize(prefix, options)
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# @overload initialize(prefix, options) { |gen| ... }
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# @yieldparam [ConstGenerator] gen new generator is passed to the block
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# When passed a block, {#calculate} is automatically called at the end of
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# the block, otherwise you must call it yourself.
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def initialize(prefix = nil, options = {})
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@includes = ['stdio.h', 'stddef.h']
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@constants = {}
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@prefix = prefix
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@required = options[:required]
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@options = options
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if block_given? then
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yield self
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calculate self.class.options.merge(options)
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end
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end
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# Set class options
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# These options are merged with {#initialize} options when it is called with a block.
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# @param [Hash] options
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# @return [Hash] class options
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def self.options=(options)
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@options = options
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end
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# Get class options.
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# @return [Hash] class options
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def self.options
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@options
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end
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# @param [String] name
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# @return constant value (converted if a +converter+ was defined).
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# Access a constant by name.
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def [](name)
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@constants[name].converted_value
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end
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# Request the value for C constant +name+.
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#
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# @param [#to_s] name C constant name
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# @param [String] format a printf format string to print the value out
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# @param [String] cast a C cast for the value
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# @param ruby_name alternate ruby name for {#to_ruby}
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#
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# @overload const(name, format=nil, cast='', ruby_name=nil, converter=nil)
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# +converter+ is a Method or a Proc.
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# @param [#call] converter convert the value from a string to the appropriate
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# type for {#to_ruby}.
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# @overload const(name, format=nil, cast='', ruby_name=nil) { |value| ... }
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# Use a converter block. This block convert the value from a string to the
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# appropriate type for {#to_ruby}.
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# @yieldparam value constant value
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def const(name, format = nil, cast = '', ruby_name = nil, converter = nil,
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&converter_proc)
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format ||= '%d'
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cast ||= ''
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if converter_proc and converter then
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raise ArgumentError, "Supply only converter or converter block"
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end
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converter = converter_proc if converter.nil?
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const = Constant.new name, format, cast, ruby_name, converter
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@constants[name.to_s] = const
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return const
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end
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# Calculate constants values.
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# @param [Hash] options
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# @option options [String] :cppflags flags for C compiler
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# @return [nil]
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# @raise if a constant is missing and +:required+ was set to +true+ (see {#initialize})
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def calculate(options = {})
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binary_path = nil
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Tempfile.open("#{@prefix}.const_generator") do |f|
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binary_path = f.path + ".bin"
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@includes.each do |inc|
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f.puts "#include <#{inc}>"
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end
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f.puts "\nint main(int argc, char **argv)\n{"
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@constants.each_value do |const|
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f.puts <<-EOF
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#ifdef #{const.name}
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printf("#{const.name} #{const.format}\\n", #{const.cast}#{const.name});
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#endif
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EOF
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end
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f.puts "\n\treturn 0;\n}"
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f.flush
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cc = ENV['CC'] || 'gcc'
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output = `#{cc} #{options[:cppflags]} -D_DARWIN_USE_64_BIT_INODE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -x c -Wall -Werror #{f.path} -o #{binary_path} 2>&1`
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unless $?.success? then
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output = output.split("\n").map { |l| "\t#{l}" }.join "\n"
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raise "Compilation error generating constants #{@prefix}:\n#{output}"
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end
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end
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output = `#{binary_path}`
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File.unlink(binary_path + (FFI::Platform.windows? ? ".exe" : ""))
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output.each_line do |line|
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line =~ /^(\S+)\s(.*)$/
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const = @constants[$1]
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const.value = $2
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end
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missing_constants = @constants.select do |name, constant|
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constant.value.nil?
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end.map { |name,| name }
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if @required and not missing_constants.empty? then
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raise "Missing required constants for #{@prefix}: #{missing_constants.join ', '}"
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end
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end
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# Dump constants to +io+.
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# @param [#puts] io
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# @return [nil]
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def dump_constants(io)
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@constants.each do |name, constant|
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name = [@prefix, name].join '.' if @prefix
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io.puts "#{name} = #{constant.converted_value}"
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end
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end
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# Outputs values for discovered constants. If the constant's value was
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# not discovered it is not omitted.
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# @return [String]
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def to_ruby
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@constants.sort_by { |name,| name }.map do |name, constant|
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if constant.value.nil? then
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"# #{name} not available"
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else
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constant.to_ruby
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end
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end.join "\n"
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end
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# Add additional C include file(s) to calculate constants from.
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# @note +stdio.h+ and +stddef.h+ automatically included
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# @param [List<String>, Array<String>] i include file(s)
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# @return [Array<String>] array of include files
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def include(*i)
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@includes |= i.flatten
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end
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end
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# This class hold constants for {ConstGenerator}
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class ConstGenerator::Constant
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attr_reader :name, :format, :cast
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attr_accessor :value
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# @param [#to_s] name
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# @param [String] format a printf format string to print the value out
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# @param [String] cast a C cast for the value
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# @param ruby_name alternate ruby name for {#to_ruby}
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# @param [#call] converter convert the value from a string to the appropriate
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# type for {#to_ruby}.
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def initialize(name, format, cast, ruby_name = nil, converter=nil)
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@name = name
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@format = format
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@cast = cast
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@ruby_name = ruby_name
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@converter = converter
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@value = nil
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end
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# Return constant value (converted if a +converter+ was defined).
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# @return constant value.
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def converted_value
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if @converter
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@converter.call(@value)
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else
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@value
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end
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end
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# get constant ruby name
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# @return [String]
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def ruby_name
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@ruby_name || @name
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end
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# Get an evaluable string from constant.
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# @return [String]
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def to_ruby
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"#{ruby_name} = #{converted_value}"
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end
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end
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end
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@@ -0,0 +1,105 @@
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require 'ffi/tools/struct_generator'
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require 'ffi/tools/const_generator'
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module FFI
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##
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# Generate files with C structs for FFI::Struct and C constants.
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#
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# == A simple example
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#
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# In file +zlib.rb.ffi+:
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# module Zlib
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# @@@
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# constants do |c|
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# c.include "zlib.h"
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# c.const :ZLIB_VERNUM
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# end
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# @@@
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#
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# class ZStream < FFI::Struct
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#
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# struct do |s|
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# s.name "struct z_stream_s"
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# s.include "zlib.h"
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#
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# s.field :next_in, :pointer
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# s.field :avail_in, :uint
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# s.field :total_in, :ulong
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# end
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# @@@
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# end
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# end
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#
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# Translate the file:
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# require "ffi/tools/generator"
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# FFI::Generator.new "zlib.rb.ffi", "zlib.rb"
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#
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# Generates the file +zlib.rb+ with constant values and offsets:
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# module Zlib
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# ZLIB_VERNUM = 4784
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#
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# class ZStream < FFI::Struct
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# layout :next_in, :pointer, 0,
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# :avail_in, :uint, 8,
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# :total_in, :ulong, 16
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# end
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#
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# @see FFI::Generator::Task for easy integration in a Rakefile
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class Generator
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def initialize(ffi_name, rb_name, options = {})
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@ffi_name = ffi_name
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@rb_name = rb_name
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@options = options
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@name = File.basename rb_name, '.rb'
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file = File.read @ffi_name
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new_file = file.gsub(/^( *)@@@(.*?)@@@/m) do
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@constants = []
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@structs = []
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indent = $1
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original_lines = $2.count "\n"
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instance_eval $2, @ffi_name, $`.count("\n")
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new_lines = []
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@constants.each { |c| new_lines << c.to_ruby }
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@structs.each { |s| new_lines << s.generate_layout }
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new_lines = new_lines.join("\n").split "\n" # expand multiline blocks
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new_lines = new_lines.map { |line| indent + line }
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padding = original_lines - new_lines.length
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new_lines += [nil] * padding if padding >= 0
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new_lines.join "\n"
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end
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open @rb_name, 'w' do |f|
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f.puts "# This file is generated from `#{@ffi_name}'. Do not edit."
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f.puts
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f.puts new_file
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end
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end
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def constants(options = {}, &block)
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@constants << FFI::ConstGenerator.new(@name, @options.merge(options), &block)
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end
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def struct(options = {}, &block)
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@structs << FFI::StructGenerator.new(@name, @options.merge(options), &block)
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end
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##
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# Utility converter for constants
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def to_s
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proc { |obj| obj.to_s.inspect }
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end
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end
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end
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@@ -0,0 +1,32 @@
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require 'ffi/tools/generator'
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require 'rake'
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require 'rake/tasklib'
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##
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# Add Rake tasks that generate files with C structs for FFI::Struct and C constants.
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#
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# @example a simple example for your Rakefile
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# require "ffi/tools/generator_task"
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# # Add a task to generate my_object.rb out of my_object.rb.ffi
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# FFI::Generator::Task.new ["my_object.rb"], cflags: "-I/usr/local/mylibrary"
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#
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# The generated files are also added to the 'clear' task.
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#
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# @see FFI::Generator for a description of the file content
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class FFI::Generator::Task < Rake::TaskLib
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def initialize(rb_names, options={})
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task :clean do rm_f rb_names end
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rb_names.each do |rb_name|
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ffi_name = "#{rb_name}.ffi"
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file rb_name => ffi_name do |t|
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puts "Generating #{rb_name}..." if Rake.application.options.trace
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FFI::Generator.new ffi_name, rb_name, options
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end
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end
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end
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end
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@@ -0,0 +1,195 @@
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require 'tempfile'
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module FFI
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##
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# Generates an FFI Struct layout.
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#
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# Given the @@@ portion in:
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#
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# class Zlib::ZStream < FFI::Struct
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# @@@
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# name "struct z_stream_s"
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# include "zlib.h"
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#
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# field :next_in, :pointer
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# field :avail_in, :uint
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# field :total_in, :ulong
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#
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# # ...
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# @@@
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# end
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#
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# StructGenerator will create the layout:
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#
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# layout :next_in, :pointer, 0,
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# :avail_in, :uint, 4,
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# :total_in, :ulong, 8,
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# # ...
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#
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# StructGenerator does its best to pad the layout it produces to preserve
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# line numbers. Place the struct definition as close to the top of the file
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# for best results.
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class StructGenerator
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@options = {}
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attr_accessor :size
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attr_reader :fields
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def initialize(name, options = {})
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@name = name
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@struct_name = nil
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@includes = []
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@fields = []
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@found = false
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@size = nil
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if block_given? then
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yield self
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calculate self.class.options.merge(options)
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end
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||||
end
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||||
def self.options=(options)
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@options = options
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||||
end
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def self.options
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@options
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end
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def calculate(options = {})
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binary = File.join Dir.tmpdir, "rb_struct_gen_bin_#{Process.pid}"
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raise "struct name not set" if @struct_name.nil?
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Tempfile.open("#{@name}.struct_generator") do |f|
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f.puts "#include <stdio.h>"
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@includes.each do |inc|
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f.puts "#include <#{inc}>"
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||||
end
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||||
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f.puts "#include <stddef.h>\n\n"
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f.puts "int main(int argc, char **argv)\n{"
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f.puts " #{@struct_name} s;"
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f.puts %[ printf("sizeof(#{@struct_name}) %u\\n", (unsigned int) sizeof(#{@struct_name}));]
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@fields.each do |field|
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f.puts <<-EOF
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||||
printf("#{field.name} %u %u\\n", (unsigned int) offsetof(#{@struct_name}, #{field.name}),
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(unsigned int) sizeof(s.#{field.name}));
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||||
EOF
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||||
end
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||||
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||||
f.puts "\n return 0;\n}"
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f.flush
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||||
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||||
cc = ENV['CC'] || 'gcc'
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output = `#{cc} #{options[:cppflags]} #{options[:cflags]} -D_DARWIN_USE_64_BIT_INODE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -x c -Wall -Werror #{f.path} -o #{binary} 2>&1`
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||||
|
||||
unless $?.success? then
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||||
@found = false
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||||
output = output.split("\n").map { |l| "\t#{l}" }.join "\n"
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||||
raise "Compilation error generating struct #{@name} (#{@struct_name}):\n#{output}"
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||||
end
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||||
end
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||||
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||||
output = `#{binary}`.split "\n"
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||||
File.unlink(binary + (FFI::Platform.windows? ? ".exe" : ""))
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sizeof = output.shift
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unless @size
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||||
m = /\s*sizeof\([^)]+\) (\d+)/.match sizeof
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@size = m[1]
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end
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||||
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||||
line_no = 0
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||||
output.each do |line|
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md = line.match(/.+ (\d+) (\d+)/)
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@fields[line_no].offset = md[1].to_i
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||||
@fields[line_no].size = md[2].to_i
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||||
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||||
line_no += 1
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||||
end
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||||
|
||||
@found = true
|
||||
end
|
||||
|
||||
def field(name, type=nil)
|
||||
field = Field.new(name, type)
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||||
@fields << field
|
||||
return field
|
||||
end
|
||||
|
||||
def found?
|
||||
@found
|
||||
end
|
||||
|
||||
def dump_config(io)
|
||||
io.puts "rbx.platform.#{@name}.sizeof = #{@size}"
|
||||
|
||||
@fields.each { |field| io.puts field.to_config(@name) }
|
||||
end
|
||||
|
||||
def generate_layout
|
||||
buf = ""
|
||||
|
||||
@fields.each_with_index do |field, i|
|
||||
if buf.empty?
|
||||
buf << "layout :#{field.name}, :#{field.type}, #{field.offset}"
|
||||
else
|
||||
buf << " :#{field.name}, :#{field.type}, #{field.offset}"
|
||||
end
|
||||
|
||||
if i < @fields.length - 1
|
||||
buf << ",\n"
|
||||
end
|
||||
end
|
||||
|
||||
buf
|
||||
end
|
||||
|
||||
def get_field(name)
|
||||
@fields.find { |f| name == f.name }
|
||||
end
|
||||
|
||||
def include(i)
|
||||
@includes << i
|
||||
end
|
||||
|
||||
def name(n)
|
||||
@struct_name = n
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
##
|
||||
# A field in a Struct.
|
||||
|
||||
class StructGenerator::Field
|
||||
|
||||
attr_reader :name
|
||||
attr_reader :type
|
||||
attr_reader :offset
|
||||
attr_accessor :size
|
||||
|
||||
def initialize(name, type)
|
||||
@name = name
|
||||
@type = type
|
||||
@offset = nil
|
||||
@size = nil
|
||||
end
|
||||
|
||||
def offset=(o)
|
||||
@offset = o
|
||||
end
|
||||
|
||||
def to_config(name)
|
||||
buf = []
|
||||
buf << "rbx.platform.#{name}.#{@name}.offset = #{@offset}"
|
||||
buf << "rbx.platform.#{name}.#{@name}.size = #{@size}"
|
||||
buf << "rbx.platform.#{name}.#{@name}.type = #{@type}" if @type
|
||||
buf
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
@@ -0,0 +1,137 @@
|
||||
require 'tempfile'
|
||||
|
||||
module FFI
|
||||
|
||||
# @private
|
||||
class TypesGenerator
|
||||
|
||||
##
|
||||
# Maps different C types to the C type representations we use
|
||||
|
||||
TYPE_MAP = {
|
||||
"char" => :char,
|
||||
"signed char" => :char,
|
||||
"__signed char" => :char,
|
||||
"unsigned char" => :uchar,
|
||||
|
||||
"short" => :short,
|
||||
"signed short" => :short,
|
||||
"signed short int" => :short,
|
||||
"unsigned short" => :ushort,
|
||||
"unsigned short int" => :ushort,
|
||||
|
||||
"int" => :int,
|
||||
"signed int" => :int,
|
||||
"unsigned int" => :uint,
|
||||
|
||||
"long" => :long,
|
||||
"long int" => :long,
|
||||
"signed long" => :long,
|
||||
"signed long int" => :long,
|
||||
"unsigned long" => :ulong,
|
||||
"unsigned long int" => :ulong,
|
||||
"long unsigned int" => :ulong,
|
||||
|
||||
"long long" => :long_long,
|
||||
"long long int" => :long_long,
|
||||
"signed long long" => :long_long,
|
||||
"signed long long int" => :long_long,
|
||||
"unsigned long long" => :ulong_long,
|
||||
"unsigned long long int" => :ulong_long,
|
||||
|
||||
"char *" => :string,
|
||||
"void *" => :pointer,
|
||||
}
|
||||
|
||||
def self.generate(options = {})
|
||||
typedefs = nil
|
||||
Tempfile.open 'ffi_types_generator' do |io|
|
||||
io.puts <<-C
|
||||
#include <stdint.h>
|
||||
#include <stddef.h>
|
||||
#include <sys/types.h>
|
||||
#if !(defined(WIN32))
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
#include <sys/resource.h>
|
||||
#endif
|
||||
C
|
||||
|
||||
io.close
|
||||
cc = ENV['CC'] || 'gcc'
|
||||
cmd = "#{cc} -E -x c #{options[:cppflags]} -D_DARWIN_USE_64_BIT_INODE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -c"
|
||||
if options[:input]
|
||||
typedefs = File.read(options[:input])
|
||||
elsif options[:remote]
|
||||
typedefs = `ssh #{options[:remote]} #{cmd} - < #{io.path}`
|
||||
else
|
||||
typedefs = `#{cmd} #{io.path}`
|
||||
end
|
||||
end
|
||||
|
||||
code = []
|
||||
|
||||
typedefs.each_line do |type|
|
||||
# We only care about single line typedef
|
||||
next unless type =~ /typedef/
|
||||
# Ignore unions or structs
|
||||
next if type =~ /union|struct/
|
||||
|
||||
# strip off the starting typedef and ending ;
|
||||
type.gsub!(/^(.*typedef\s*)/, "")
|
||||
type.gsub!(/\s*;\s*$/, "")
|
||||
|
||||
parts = type.split(/\s+/)
|
||||
def_type = parts.join(" ")
|
||||
|
||||
# GCC does mapping with __attribute__ stuf, also see
|
||||
# http://hal.cs.berkeley.edu/cil/cil016.html section 16.2.7. Problem
|
||||
# with this is that the __attribute__ stuff can either occur before or
|
||||
# after the new type that is defined...
|
||||
if type =~ /__attribute__/
|
||||
if parts.last =~ /__QI__|__HI__|__SI__|__DI__|__word__/
|
||||
|
||||
# In this case, the new type is BEFORE __attribute__ we need to
|
||||
# find the final_type as the type before the part that starts with
|
||||
# __attribute__
|
||||
final_type = ""
|
||||
parts.each do |p|
|
||||
break if p =~ /__attribute__/
|
||||
final_type = p
|
||||
end
|
||||
else
|
||||
final_type = parts.pop
|
||||
end
|
||||
|
||||
def_type = case type
|
||||
when /__QI__/ then "char"
|
||||
when /__HI__/ then "short"
|
||||
when /__SI__/ then "int"
|
||||
when /__DI__/ then "long long"
|
||||
when /__word__/ then "long"
|
||||
else "int"
|
||||
end
|
||||
|
||||
def_type = "unsigned #{def_type}" if type =~ /unsigned/
|
||||
else
|
||||
final_type = parts.pop
|
||||
def_type = parts.join(" ")
|
||||
end
|
||||
|
||||
if type = TYPE_MAP[def_type]
|
||||
code << "rbx.platform.typedef.#{final_type} = #{type}"
|
||||
TYPE_MAP[final_type] = TYPE_MAP[def_type]
|
||||
else
|
||||
# Fallback to an ordinary pointer if we don't know the type
|
||||
if def_type =~ /\*/
|
||||
code << "rbx.platform.typedef.#{final_type} = pointer"
|
||||
TYPE_MAP[final_type] = :pointer
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
code.sort.join("\n")
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
Reference in New Issue
Block a user