1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
require 'fiddle'
require 'fiddle/struct'
require 'fiddle/cparser'
module Fiddle
# Used internally by Fiddle::Importer
class CompositeHandler
# Create a new handler with the open +handlers+
#
# Used internally by Fiddle::Importer.dlload
def initialize(handlers)
@handlers = handlers
end
# Array of the currently loaded libraries.
def handlers()
@handlers
end
# Returns the address as an Integer from any handlers with the function
# named +symbol+.
#
# Raises a DLError if the handle is closed.
def sym(symbol)
@handlers.each{|handle|
if( handle )
begin
addr = handle.sym(symbol)
return addr
rescue DLError
end
end
}
return nil
end
# See Fiddle::CompositeHandler.sym
def [](symbol)
sym(symbol)
end
end
# A DSL that provides 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 'fiddle'
# require 'fiddle/import'
#
# module LibSum
# extend Fiddle::Importer
# dlload './libsum.so'
# extern 'double sum(double*, int)'
# extern 'double split(double)'
# end
#
module Importer
include Fiddle
include CParser
extend Importer
# Creates an array of handlers for the given +libs+, can be an instance of
# Fiddle::Handle, Fiddle::Importer, or will create a new instance of
# Fiddle::Handle using Fiddle.dlopen
#
# Raises a DLError if the library cannot be loaded.
#
# See Fiddle.dlopen
def dlload(*libs)
handles = libs.collect{|lib|
case lib
when nil
nil
when Handle
lib
when Importer
lib.handlers
else
begin
Fiddle.dlopen(lib)
rescue DLError
raise(DLError, "can't load #{lib}")
end
end
}.flatten()
@handler = CompositeHandler.new(handles)
@func_map = {}
@type_alias = {}
end
# Sets the type alias for +alias_type+ as +orig_type+
def typealias(alias_type, orig_type)
@type_alias[alias_type] = orig_type
end
# Returns the sizeof +ty+, using Fiddle::Importer.parse_ctype to determine
# the C type and the appropriate Fiddle constant.
def sizeof(ty)
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 Pointer[ty].size()
end
def parse_bind_options(opts)
h = {}
while( opt = opts.shift() )
case opt
when :stdcall, :cdecl
h[:call_type] = opt
when :carried, :temp, :temporal, :bind
h[:callback_type] = opt
h[:carrier] = opts.shift()
else
h[opt] = true
end
end
h
end
private :parse_bind_options
# :stopdoc:
CALL_TYPE_TO_ABI = Hash.new { |h, k|
raise RuntimeError, "unsupported call type: #{k}"
}.merge({ :stdcall => (Function::STDCALL rescue Function::DEFAULT),
:cdecl => Function::DEFAULT,
nil => Function::DEFAULT
}).freeze
private_constant :CALL_TYPE_TO_ABI
# :startdoc:
# Creates a global method from the given C +signature+.
def extern(signature, *opts)
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
# Creates a global method from the given C +signature+ using the given
# +opts+ as bind parameters with the given block.
def bind(signature, *opts, &blk)
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)
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
# Creates a class to wrap the C struct described by +signature+.
#
# MyStruct = struct ['int i', 'char c']
def struct(signature)
tys, mems = parse_struct_signature(signature, @type_alias)
Fiddle::CStructBuilder.create(CStruct, tys, mems)
end
# Creates a class to wrap the C union described by +signature+.
#
# MyUnion = union ['int i', 'char c']
def union(signature)
tys, mems = parse_struct_signature(signature, @type_alias)
Fiddle::CStructBuilder.create(CUnion, tys, mems)
end
# Returns the function mapped to +name+, that was created by either
# Fiddle::Importer.extern or Fiddle::Importer.bind
def [](name)
@func_map[name]
end
# Creates a class to wrap the C struct with the value +ty+
#
# See also Fiddle::Importer.struct
def create_value(ty, val=nil)
s = struct([ty + " value"])
ptr = s.malloc()
if( val )
ptr.value = val
end
return ptr
end
alias value create_value
# Returns a new instance of the C struct with the value +ty+ at the +addr+
# address.
def import_value(ty, addr)
s = struct([ty + " value"])
ptr = s.new(addr)
return ptr
end
# The Fiddle::CompositeHandler instance
#
# Will raise an error if no handlers are open.
def handler
@handler or raise "call dlload before importing symbols and functions"
end
# Returns a new Fiddle::Pointer instance at the memory address of the given
# +name+ symbol.
#
# Raises a DLError if the +name+ doesn't exist.
#
# See Fiddle::CompositeHandler.sym and Fiddle::Handle.sym
def import_symbol(name)
addr = handler.sym(name)
if( !addr )
raise(DLError, "cannot find the symbol: #{name}")
end
Pointer.new(addr)
end
# Returns a new Fiddle::Function instance at the memory address of the given
# +name+ function.
#
# Raises a DLError if the +name+ doesn't exist.
#
# * +argtype+ is an Array of arguments, passed to the +name+ function.
# * +ctype+ is the return type of the function
# * +call_type+ is the ABI of the function
#
# See also Fiddle:Function.new
#
# See Fiddle::CompositeHandler.sym and Fiddle::Handler.sym
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(addr, argtype, ctype, CALL_TYPE_TO_ABI[call_type],
name: name)
end
# Returns a new closure wrapper for the +name+ function.
#
# * +ctype+ is the return type of the function
# * +argtype+ is an Array of arguments, passed to the callback function
# * +call_type+ is the abi of the closure
# * +block+ is passed to the callback
#
# See Fiddle::Closure
def bind_function(name, ctype, argtype, call_type = nil, &block)
abi = CALL_TYPE_TO_ABI[call_type]
closure = Class.new(Fiddle::Closure) {
define_method(:call, block)
}.new(ctype, argtype, abi)
Function.new(closure, argtype, ctype, abi, name: name)
end
end
end
|