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ffi.rb
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ffi.rb
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# -*- encoding: us-ascii -*-
##
# A Foreign Function Interface used to bind C libraries to ruby.
module FFI
# Specialised error classes
class TypeError < RuntimeError; end
class NotFoundError < RuntimeError; end
# Shorthand for the current process, i.e. all code that
# the process image itself contains. In addition to the
# Rubinius codebase, this also includes libc etc.
#
# Use this constant instead of nil directly.
#
CURRENT_PROCESS = nil
TypeDefs = Rubinius::LookupTable.new
class << self
def add_typedef(current, add)
if current.kind_of? Fixnum
code = current
else
code = FFI::TypeDefs[current]
raise TypeError, "Unable to resolve type '#{current}'" unless code
end
FFI::TypeDefs[add] = code
end
def find_type(name)
code = FFI::TypeDefs[name]
raise TypeError, "Unable to resolve type '#{name}'" unless code
return code
end
##
# Given a +type+ as a number, indicate how many bytes that type
# takes up on this platform.
def type_size(type)
Rubinius.primitive :nativefunction_type_size
case type
when Symbol
return type_size(find_type(type))
when Rubinius::NativeFunction
return type_size(TYPE_PTR)
when FFI::Enum
return type_size(TYPE_ENUM)
end
raise PrimitiveFailure, "FFI.type_size primitive failed: #{type}"
end
def size_to_type(size)
if sz = TypeSizes[size]
return sz
end
# Be like C, use int as the default type size.
return :int
end
def config(name)
Rubinius::Config["rbx.platform.#{name}"]
end
def config_hash(name)
vals = {}
section = "rbx.platform.#{name}."
Rubinius::Config.section section do |key, value|
vals[key.substring(section.size, key.length)] = value
end
vals
end
def errno
FFI::Platform::POSIX.errno
end
end
# Converts a char
add_typedef TYPE_CHAR, :char
# Converts an unsigned char
add_typedef TYPE_UCHAR, :uchar
# The C++ boolean type
add_typedef TYPE_BOOL, :bool
# Converts a short
add_typedef TYPE_SHORT, :short
# Converts an unsigned short
add_typedef TYPE_USHORT, :ushort
# Converts an int
add_typedef TYPE_INT, :int
# Converts an unsigned int
add_typedef TYPE_UINT, :uint
# Converts a long
add_typedef TYPE_LONG, :long
# Converts an unsigned long
add_typedef TYPE_ULONG, :ulong
# Converts a size_t
add_typedef TYPE_ULONG, :size_t
# Converts a long long
add_typedef TYPE_LL, :long_long
# Converts an unsigned long long
add_typedef TYPE_ULL, :ulong_long
# Converts a float
add_typedef TYPE_FLOAT, :float
# Converts a double
add_typedef TYPE_DOUBLE, :double
# Converts a pointer to opaque data
add_typedef TYPE_PTR, :pointer
# For when a function has no return value
add_typedef TYPE_VOID, :void
# Converts NULL-terminated C strings
add_typedef TYPE_STRING, :string
# Use strptr when you need to free the result of some operation.
add_typedef TYPE_STRPTR, :strptr
add_typedef TYPE_STRPTR, :string_and_pointer
# Use for a C struct with a char [] embedded inside.
add_typedef TYPE_CHARARR, :char_array
# A set of unambigious integer types
add_typedef TYPE_CHAR, :int8
add_typedef TYPE_UCHAR, :uint8
add_typedef TYPE_SHORT, :int16
add_typedef TYPE_USHORT, :uint16
add_typedef TYPE_INT, :int32
add_typedef TYPE_UINT, :uint32
# Converts a varargs argument
add_typedef TYPE_VARARGS, :varargs
if Rubinius::L64
add_typedef TYPE_LONG, :int64
add_typedef TYPE_ULONG, :uint64
else
add_typedef TYPE_LL, :int64
add_typedef TYPE_ULL, :uint64
end
TypeSizes = Rubinius::LookupTable.new
TypeSizes[1] = :char
TypeSizes[2] = :short
TypeSizes[4] = :int
TypeSizes[8] = Rubinius::L64 ? :long : :long_long
# Load all the platform dependent types
Rubinius::Config.section("rbx.platform.typedef.") do |key, value|
add_typedef(find_type(value.to_sym), key.substring(21, key.length).to_sym)
end
# It's a class to be compat with the ffi gem.
class Type
class Array
def initialize(element_type, size, impl_class=nil)
@element_type = element_type
@size = size
@implementation = impl_class
end
attr_reader :element_type
attr_reader :size
attr_reader :implementation
end
class StructByValue
def initialize(struct)
@implementation = struct
end
attr_reader :implementation
end
Struct = StructByValue
CHAR = TYPE_CHAR
UCHAR = TYPE_UCHAR
BOOL = TYPE_BOOL
SHORT = TYPE_SHORT
USHORT = TYPE_USHORT
INT = TYPE_INT
UINT = TYPE_UINT
LONG = TYPE_LONG
ULONG = TYPE_ULONG
LL = TYPE_LL
ULL = TYPE_ULL
FLOAT = TYPE_FLOAT
DOUBLE = TYPE_DOUBLE
PTR = TYPE_PTR
VOID = TYPE_VOID
STRING = TYPE_STRING
STRPTR = TYPE_STRPTR
CHARARR = TYPE_CHARARR
ENUM = TYPE_ENUM
VARARGS = TYPE_VARARGS
end
end
##
# Namespace for holding platform-specific C constants.
module FFI::Platform
case
when Rubinius.windows?
LIBSUFFIX = "dll"
IS_WINDOWS = true
OS = 'windows'
when Rubinius.darwin?
LIBSUFFIX = "dylib"
IS_WINDOWS = false
OS = 'darwin'
else
LIBSUFFIX = "so"
IS_WINDOWS = false
OS = 'linux'
end
ARCH = Rubinius::CPU
# ruby-ffi compatible
LONG_SIZE = Rubinius::SIZEOF_LONG * 8
ADDRESS_SIZE = Rubinius::WORDSIZE
def self.windows?
Rubinius.windows?
end
def self.mac?
Rubinius.darwin?
end
def self.unix?
! windows?
end
end