Module: DL::Importer

Extended by:
Importer
Includes:
DL, CParser
Included in:
Importer
Defined in:
lib/dl/import.rb

Overview

DL::Importer includes the means to dynamically load libraries and build modules around them including calling extern functions within the C library that has been loaded.

Example

require 'dl'
require 'dl/import'

module LibSum
	extend DL::Importer
	dlload './libsum.so'
	extern 'double sum(double*, int)'
	extern 'double split(double)'
end

Constant Summary

Constants included from DL

ALIGN_CHAR, ALIGN_DOUBLE, ALIGN_FLOAT, ALIGN_INT, ALIGN_INTPTR_T, ALIGN_LONG, ALIGN_LONG_LONG, ALIGN_PTRDIFF_T, ALIGN_SHORT, ALIGN_SIZE_T, ALIGN_SSIZE_T, ALIGN_UINTPTR_T, ALIGN_VOIDP, BUILD_RUBY_PLATFORM, BUILD_RUBY_VERSION, CdeclCallbackAddrs, CdeclCallbackProcs, DLSTACK_SIZE, MAX_CALLBACK, NULL, RTLD_GLOBAL, RTLD_LAZY, RTLD_NOW, RUBY_FREE, SEM, SIZEOF_CHAR, SIZEOF_DOUBLE, SIZEOF_FLOAT, SIZEOF_INT, SIZEOF_INTPTR_T, SIZEOF_LONG, SIZEOF_LONG_LONG, SIZEOF_PTRDIFF_T, SIZEOF_SHORT, SIZEOF_SIZE_T, SIZEOF_SSIZE_T, SIZEOF_UINTPTR_T, SIZEOF_VOIDP, StdcallCallbackAddrs, StdcallCallbackProcs, TYPE_CHAR, TYPE_DOUBLE, TYPE_FLOAT, TYPE_INT, TYPE_INTPTR_T, TYPE_LONG, TYPE_LONG_LONG, TYPE_PTRDIFF_T, TYPE_SHORT, TYPE_SIZE_T, TYPE_SSIZE_T, TYPE_UINTPTR_T, TYPE_VOID, TYPE_VOIDP

Instance Method Summary collapse

Methods included from CParser

#parse_ctype, #parse_signature, #parse_struct_signature

Methods included from DL

dlopen, dlunwrap, dlwrap, fiddle?, free, malloc, realloc, #remove_callback_internal, #remove_cdecl_callback, #remove_stdcall_callback, #set_callback_internal, #set_cdecl_callback, #set_stdcall_callback

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/dl/import.rb', line 203

def [](name)
  @func_map[name]
end

#bind(signature, *opts, &blk) ⇒ Object 



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# File 'lib/dl/import.rb', line 154

def bind(signature, *opts, &blk)
  @type_alias ||= nil
  name, ctype, argtype = parse_signature(signature, @type_alias)
  h = parse_bind_options(opts)
  case h[:callback_type]
  when :bind, nil
    f = bind_function(name, ctype, argtype, h[:call_type], &blk)
  when :temp, :temporal
    f = create_temp_function(name, ctype, argtype, h[:call_type])
  when :carried
    f = create_carried_function(name, ctype, argtype, h[:call_type], h[:carrier])
  else
    raise(RuntimeError, "unknown callback type: #{h[:callback_type]}")
  end
  @func_map[name] = f
  #define_method(name){|*args,&block| f.call(*args,&block)}
  begin
    /^(.+?):(\d+)/ =~ caller.first
    file, line = $1, $2.to_i
  rescue
    file, line = __FILE__, __LINE__+3
  end
  module_eval(<<-EOS, file, line)
    def #{name}(*args,&block)
      @func_map['#{name}'].call(*args,&block)
    end
  EOS
  module_function(name)
  f
end

#bind_function(name, ctype, argtype, call_type = nil, &block) ⇒ Object 



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# File 'lib/dl/import.rb', line 244

def bind_function(name, ctype, argtype, call_type = nil, &block)
  if DL.fiddle?
    klass = Function.instance_eval { class_fiddle_closure_cfunc }
    abi = Function.instance_eval { call_type_to_abi(call_type) }
    closure = Class.new(klass) {
      define_method(:call, block)
    }.new(ctype, argtype, abi, name)

    Function.new(closure, argtype, abi)
  else
    f = Function.new(CFunc.new(0, ctype, name, call_type || :cdecl), argtype)
    f.bind(&block)
    f
  end
end

#create_carried_function(name, ctype, argtype, call_type = nil, n = 0) ⇒ Object 



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# File 'lib/dl/import.rb', line 264

def create_carried_function(name, ctype, argtype, call_type = nil, n = 0)
  CarriedFunction.new(CFunc.new(0, ctype, name, call_type || :cdecl), argtype, n)
end

#create_temp_function(name, ctype, argtype, call_type = nil) ⇒ Object 



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# File 'lib/dl/import.rb', line 260

def create_temp_function(name, ctype, argtype, call_type = nil)
  TempFunction.new(CFunc.new(0, ctype, name, call_type || :cdecl), argtype)
end

#create_value(ty, val = nil) ⇒ Object Also known as: value 



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# File 'lib/dl/import.rb', line 207

def create_value(ty, val=nil)
  s = struct([ty + " value"])
  ptr = s.malloc()
  if( val )
    ptr.value = val
  end
  return ptr
end

#dlload(*libs) ⇒ Object 



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# File 'lib/dl/import.rb', line 55

def dlload(*libs)
  handles = libs.collect{|lib|
    case lib
    when nil
      nil
    when Handle
      lib
    when Importer
      lib.handlers
    else
      begin
        DL.dlopen(lib)
      rescue DLError
        raise(DLError, "can't load #{lib}")
      end
    end
  }.flatten()
  @handler = CompositeHandler.new(handles)
  @func_map = {}
  @type_alias = {}
end

#extern(signature, *opts) ⇒ Object 



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# File 'lib/dl/import.rb', line 131

def extern(signature, *opts)
  @type_alias ||= nil
  symname, ctype, argtype = parse_signature(signature, @type_alias)
  opt = parse_bind_options(opts)
  f = import_function(symname, ctype, argtype, opt[:call_type])
  name = symname.gsub(/@.+/,'')
  @func_map[name] = f
  # define_method(name){|*args,&block| f.call(*args,&block)}
  begin
    /^(.+?):(\d+)/ =~ caller.first
    file, line = $1, $2.to_i
  rescue
    file, line = __FILE__, __LINE__+3
  end
  module_eval(<<-EOS, file, line)
    def #{name}(*args, &block)
      @func_map['#{name}'].call(*args,&block)
    end
  EOS
  module_function(name)
  f
end

#handler ⇒ Object 



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# File 'lib/dl/import.rb', line 223

def handler
  defined?(@handler) or raise "call dlload before importing symbols and functions"
  @handler
end

#import_function(name, ctype, argtype, call_type = nil) ⇒ Object 



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# File 'lib/dl/import.rb', line 236

def import_function(name, ctype, argtype, call_type = nil)
  addr = handler.sym(name)
  if( !addr )
    raise(DLError, "cannot find the function: #{name}()")
  end
  Function.new(CFunc.new(addr, ctype, name, call_type || :cdecl), argtype)
end

#import_symbol(name) ⇒ Object 



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# File 'lib/dl/import.rb', line 228

def import_symbol(name)
  addr = handler.sym(name)
  if( !addr )
    raise(DLError, "cannot find the symbol: #{name}")
  end
  CPtr.new(addr)
end

#import_value(ty, addr) ⇒ Object 



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# File 'lib/dl/import.rb', line 217

def import_value(ty, addr)
  s = struct([ty + " value"])
  ptr = s.new(addr)
  return ptr
end

#sizeof(ty) ⇒ Object 



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# File 'lib/dl/import.rb', line 81

def sizeof(ty)
  @type_alias ||= nil
  case ty
  when String
    ty = parse_ctype(ty, @type_alias).abs()
    case ty
    when TYPE_CHAR
      return SIZEOF_CHAR
    when TYPE_SHORT
      return SIZEOF_SHORT
    when TYPE_INT
      return SIZEOF_INT
    when TYPE_LONG
      return SIZEOF_LONG
    when TYPE_LONG_LONG
      return SIZEOF_LONG_LON
    when TYPE_FLOAT
      return SIZEOF_FLOAT
    when TYPE_DOUBLE
      return SIZEOF_DOUBLE
    when TYPE_VOIDP
      return SIZEOF_VOIDP
    else
      raise(DLError, "unknown type: #{ty}")
    end
  when Class
    if( ty.instance_methods().include?(:to_ptr) )
      return ty.size()
    end
  end
  return CPtr[ty].size()
end

#struct(signature) ⇒ Object

Creates a class to wrap the C struct described by signature.

MyStruct = struct ['int i', 'char c']



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# File 'lib/dl/import.rb', line 188

def struct(signature)
  @type_alias ||= nil
  tys, mems = parse_struct_signature(signature, @type_alias)
  DL::CStructBuilder.create(CStruct, tys, mems)
end

#typealias(alias_type, orig_type) ⇒ Object 



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# File 'lib/dl/import.rb', line 77

def typealias(alias_type, orig_type)
  @type_alias[alias_type] = orig_type
end

#union(signature) ⇒ Object

Creates a class to wrap the C union described by signature.

MyUnion = union ['int i', 'char c']



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# File 'lib/dl/import.rb', line 197

def union(signature)
  @type_alias ||= nil
  tys, mems = parse_struct_signature(signature, @type_alias)
  DL::CStructBuilder.create(CUnion, tys, mems)
end