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Diffstat (limited to 'lib/ffi/function.rb')
| -rw-r--r-- | lib/ffi/function.rb | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/ffi/function.rb b/lib/ffi/function.rb new file mode 100644 index 0000000..ac4daf0 --- /dev/null +++ b/lib/ffi/function.rb @@ -0,0 +1,71 @@ +# +# Copyright (C) 2008-2010 JRuby project +# +# This file is part of ruby-ffi. +# +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are met: +# +# * Redistributions of source code must retain the above copyright notice, this +# list of conditions and the following disclaimer. +# * Redistributions in binary form must reproduce the above copyright notice +# this list of conditions and the following disclaimer in the documentation +# and/or other materials provided with the distribution. +# * Neither the name of the Ruby FFI project nor the names of its contributors +# may be used to endorse or promote products derived from this software +# without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +module FFI + class Function + # Only MRI allows function type queries + if private_method_defined?(:type) + # Retrieve the return type of the function + # + # This method returns FFI type returned by the function. + # + # @return [FFI::Type] + def return_type + type.return_type + end + + # Retrieve Array of parameter types + # + # This method returns an Array of FFI types accepted as function parameters. + # + # @return [Array<FFI::Type>] + def param_types + type.param_types + end + end + + # Stash the Function in a module variable so it can be inspected by attached_functions. + # On CRuby it also ensures that it does not get garbage collected. + module RegisterAttach + def attach(mod, name) + funcs = mod.instance_variable_get("@ffi_functions") + unless funcs + funcs = {} + mod.instance_variable_set("@ffi_functions", funcs) + end + funcs[name.to_sym] = self + # Jump to the native attach method of CRuby, JRuby or Tuffleruby + super + end + end + private_constant :RegisterAttach + prepend RegisterAttach + end +end |