Class: FFI::TypesGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/ffi/tools/types_generator.rb

Constant Summary collapse

TYPE_MAP =

Maps different C types to the C type representations we use

{
           "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,
}

Class Method Summary collapse

Class Method Details

.generate(options = {}) ⇒ Object 



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# File 'lib/ffi/tools/types_generator.rb', line 44

def self.generate(options = {})
  typedefs = nil
  Tempfile.open 'ffi_types_generator' do |io|
    io.puts <<-C
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/resource.h>
    C

    io.close
    typedefs = `gcc -E -x c #{options[:cppflags]} -D_DARWIN_USE_64_BIT_INODE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -c #{io.path}`
  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}\n"
      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\n"
        TYPE_MAP[final_type] = :pointer
      end
    end
  end

  code
end