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<!DOCTYPE html>
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<h1>Source code for torch.utils.ffi</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">glob</span>
<span class="kn">import</span> <span class="nn">tempfile</span>
<span class="kn">import</span> <span class="nn">shutil</span>
<span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">wraps</span><span class="p">,</span> <span class="n">reduce</span>
<span class="kn">from</span> <span class="nn">string</span> <span class="k">import</span> <span class="n">Template</span>
<span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">import</span> <span class="nn">torch.cuda</span>
<span class="kn">from</span> <span class="nn">torch._utils</span> <span class="k">import</span> <span class="n">_accumulate</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">cffi</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ImportError</span><span class="p">(</span><span class="s2">"torch.utils.ffi requires the cffi package"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">cffi</span><span class="o">.</span><span class="n">__version_info__</span> <span class="o"><</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">0</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">ImportError</span><span class="p">(</span><span class="s2">"torch.utils.ffi requires cffi version >= 1.4, but "</span>
<span class="s2">"got "</span> <span class="o">+</span> <span class="s1">'.'</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">str</span><span class="p">,</span> <span class="n">cffi</span><span class="o">.</span><span class="n">__version_info__</span><span class="p">)))</span>
<span class="k">def</span> <span class="nf">_generate_typedefs</span><span class="p">():</span>
<span class="n">typedefs</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'Double'</span><span class="p">,</span> <span class="s1">'Float'</span><span class="p">,</span> <span class="s1">'Long'</span><span class="p">,</span> <span class="s1">'Int'</span><span class="p">,</span> <span class="s1">'Short'</span><span class="p">,</span> <span class="s1">'Char'</span><span class="p">,</span> <span class="s1">'Byte'</span><span class="p">]:</span>
<span class="k">for</span> <span class="n">lib</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'TH'</span><span class="p">,</span> <span class="s1">'THCuda'</span><span class="p">]:</span>
<span class="k">for</span> <span class="n">kind</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'Tensor'</span><span class="p">,</span> <span class="s1">'Storage'</span><span class="p">]:</span>
<span class="n">python_name</span> <span class="o">=</span> <span class="n">t</span> <span class="o">+</span> <span class="n">kind</span>
<span class="k">if</span> <span class="n">t</span> <span class="o">==</span> <span class="s1">'Float'</span> <span class="ow">and</span> <span class="n">lib</span> <span class="o">==</span> <span class="s1">'THCuda'</span><span class="p">:</span>
<span class="n">th_name</span> <span class="o">=</span> <span class="s1">'THCuda'</span> <span class="o">+</span> <span class="n">kind</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">th_name</span> <span class="o">=</span> <span class="n">lib</span> <span class="o">+</span> <span class="n">t</span> <span class="o">+</span> <span class="n">kind</span>
<span class="n">th_struct</span> <span class="o">=</span> <span class="s1">'struct '</span> <span class="o">+</span> <span class="n">th_name</span>
<span class="n">typedefs</span> <span class="o">+=</span> <span class="p">[</span><span class="s1">'typedef </span><span class="si">{}</span><span class="s1"> </span><span class="si">{}</span><span class="s1">;'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">th_struct</span><span class="p">,</span> <span class="n">th_name</span><span class="p">)]</span>
<span class="n">module</span> <span class="o">=</span> <span class="n">torch</span> <span class="k">if</span> <span class="n">lib</span> <span class="o">==</span> <span class="s1">'TH'</span> <span class="k">else</span> <span class="n">torch</span><span class="o">.</span><span class="n">cuda</span>
<span class="n">python_class</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="n">python_name</span><span class="p">)</span>
<span class="n">_cffi_to_torch</span><span class="p">[</span><span class="n">th_struct</span><span class="p">]</span> <span class="o">=</span> <span class="n">python_class</span>
<span class="n">_torch_to_cffi</span><span class="p">[</span><span class="n">python_class</span><span class="p">]</span> <span class="o">=</span> <span class="n">th_struct</span>
<span class="k">return</span> <span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">typedefs</span><span class="p">)</span> <span class="o">+</span> <span class="s1">'</span><span class="se">\n</span><span class="s1">'</span>
<span class="n">_cffi_to_torch</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">_torch_to_cffi</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">_typedefs</span> <span class="o">=</span> <span class="n">_generate_typedefs</span><span class="p">()</span>
<span class="n">PY_MODULE_TEMPLATE</span> <span class="o">=</span> <span class="n">Template</span><span class="p">(</span><span class="s2">"""</span>
<span class="s2">from torch.utils.ffi import _wrap_function</span>
<span class="s2">from .$cffi_wrapper_name import lib as _lib, ffi as _ffi</span>
<span class="s2">__all__ = []</span>
<span class="s2">def _import_symbols(locals):</span>
<span class="s2"> for symbol in dir(_lib):</span>
<span class="s2"> fn = getattr(_lib, symbol)</span>
<span class="s2"> locals[symbol] = _wrap_function(fn, _ffi)</span>
<span class="s2"> __all__.append(symbol)</span>
<span class="s2">_import_symbols(locals())</span>
<span class="s2">"""</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_setup_wrapper</span><span class="p">(</span><span class="n">with_cuda</span><span class="p">):</span>
<span class="n">here</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">abspath</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">__file__</span><span class="p">))</span>
<span class="n">lib_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">here</span><span class="p">,</span> <span class="s1">'..'</span><span class="p">,</span> <span class="s1">'..'</span><span class="p">,</span> <span class="s1">'lib'</span><span class="p">)</span>
<span class="n">include_dirs</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">lib_dir</span><span class="p">,</span> <span class="s1">'include'</span><span class="p">),</span>
<span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">lib_dir</span><span class="p">,</span> <span class="s1">'include'</span><span class="p">,</span> <span class="s1">'TH'</span><span class="p">),</span>
<span class="p">]</span>
<span class="n">wrapper_source</span> <span class="o">=</span> <span class="s1">'#include <TH/TH.h></span><span class="se">\n</span><span class="s1">'</span>
<span class="k">if</span> <span class="n">with_cuda</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">torch.cuda</span>
<span class="n">wrapper_source</span> <span class="o">+=</span> <span class="s1">'#include <THC/THC.h></span><span class="se">\n</span><span class="s1">'</span>
<span class="n">cuda_include_dirs</span> <span class="o">=</span> <span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="s1">'/usr/local/cuda/include'</span><span class="p">)</span>
<span class="n">cuda_include_dirs</span> <span class="o">+=</span> <span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="s1">'/Developer/NVIDIA/CUDA-*/include'</span><span class="p">)</span>
<span class="n">include_dirs</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">lib_dir</span><span class="p">,</span> <span class="s1">'include'</span><span class="p">,</span> <span class="s1">'THC'</span><span class="p">))</span>
<span class="n">include_dirs</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">cuda_include_dirs</span><span class="p">)</span>
<span class="k">return</span> <span class="n">wrapper_source</span><span class="p">,</span> <span class="n">include_dirs</span>
<span class="k">def</span> <span class="nf">_create_module_dir</span><span class="p">(</span><span class="n">base_path</span><span class="p">,</span> <span class="n">fullname</span><span class="p">):</span>
<span class="n">module</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">name</span> <span class="o">=</span> <span class="n">fullname</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s1">'.'</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">module</span><span class="p">:</span>
<span class="n">target_dir</span> <span class="o">=</span> <span class="n">name</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">target_dir</span> <span class="o">=</span> <span class="n">reduce</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">,</span> <span class="n">fullname</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">'.'</span><span class="p">))</span>
<span class="n">target_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">base_path</span><span class="p">,</span> <span class="n">target_dir</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">target_dir</span><span class="p">)</span>
<span class="k">except</span> <span class="n">os</span><span class="o">.</span><span class="n">error</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">for</span> <span class="n">dirname</span> <span class="ow">in</span> <span class="n">_accumulate</span><span class="p">(</span><span class="n">fullname</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">'.'</span><span class="p">),</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">):</span>
<span class="n">init_file</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">base_path</span><span class="p">,</span> <span class="n">dirname</span><span class="p">,</span> <span class="s1">'__init__.py'</span><span class="p">)</span>
<span class="nb">open</span><span class="p">(</span><span class="n">init_file</span><span class="p">,</span> <span class="s1">'a'</span><span class="p">)</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> <span class="c1"># Create file if it doesn't exist yet</span>
<span class="k">return</span> <span class="n">name</span><span class="p">,</span> <span class="n">target_dir</span>
<span class="k">def</span> <span class="nf">_build_extension</span><span class="p">(</span><span class="n">ffi</span><span class="p">,</span> <span class="n">cffi_wrapper_name</span><span class="p">,</span> <span class="n">target_dir</span><span class="p">,</span> <span class="n">verbose</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">tmpdir</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkdtemp</span><span class="p">()</span>
<span class="n">libname</span> <span class="o">=</span> <span class="n">cffi_wrapper_name</span> <span class="o">+</span> <span class="s1">'.so'</span>
<span class="n">ffi</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="n">tmpdir</span><span class="o">=</span><span class="n">tmpdir</span><span class="p">,</span> <span class="n">verbose</span><span class="o">=</span><span class="n">verbose</span><span class="p">,</span> <span class="n">target</span><span class="o">=</span><span class="n">libname</span><span class="p">)</span>
<span class="n">shutil</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">tmpdir</span><span class="p">,</span> <span class="n">libname</span><span class="p">),</span>
<span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">target_dir</span><span class="p">,</span> <span class="n">libname</span><span class="p">))</span>
<span class="k">finally</span><span class="p">:</span>
<span class="n">shutil</span><span class="o">.</span><span class="n">rmtree</span><span class="p">(</span><span class="n">tmpdir</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_make_python_wrapper</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">cffi_wrapper_name</span><span class="p">,</span> <span class="n">target_dir</span><span class="p">):</span>
<span class="n">py_source</span> <span class="o">=</span> <span class="n">PY_MODULE_TEMPLATE</span><span class="o">.</span><span class="n">substitute</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">,</span>
<span class="n">cffi_wrapper_name</span><span class="o">=</span><span class="n">cffi_wrapper_name</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">target_dir</span><span class="p">,</span> <span class="s1">'__init__.py'</span><span class="p">),</span> <span class="s1">'w'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">py_source</span><span class="p">)</span>
<div class="viewcode-block" id="create_extension"><a class="viewcode-back" href="../../../ffi.html#torch.utils.ffi.create_extension">[docs]</a><span class="k">def</span> <span class="nf">create_extension</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">headers</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">verbose</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">with_cuda</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">package</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">relative_to</span><span class="o">=</span><span class="s1">'.'</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""Creates and configures a cffi.FFI object, that builds PyTorch extension.</span>
<span class="sd"> Arguments:</span>
<span class="sd"> name (str): package name. Can be a nested module e.g. ``.ext.my_lib``.</span>
<span class="sd"> headers (str or List[str]): list of headers, that contain only exported</span>
<span class="sd"> functions</span>
<span class="sd"> sources (List[str]): list of sources to compile.</span>
<span class="sd"> verbose (bool, optional): if set to ``False``, no output will be printed</span>
<span class="sd"> (default: True).</span>
<span class="sd"> with_cuda (bool, optional): set to ``True`` to compile with CUDA headers</span>
<span class="sd"> (default: False)</span>
<span class="sd"> package (bool, optional): set to ``True`` to build in package mode (for modules</span>
<span class="sd"> meant to be installed as pip packages) (default: False).</span>
<span class="sd"> relative_to (str, optional): path of the build file. Required when</span>
<span class="sd"> ``package is True``. It's best to use ``__file__`` for this argument.</span>
<span class="sd"> kwargs: additional arguments that are passed to ffi to declare the</span>
<span class="sd"> extension. See `Extension API reference`_ for details.</span>
<span class="sd"> .. _`Extension API reference`: https://docs.python.org/3/distutils/apiref.html#distutils.core.Extension</span>
<span class="sd"> """</span>
<span class="n">base_path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">abspath</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">relative_to</span><span class="p">))</span>
<span class="n">name_suffix</span><span class="p">,</span> <span class="n">target_dir</span> <span class="o">=</span> <span class="n">_create_module_dir</span><span class="p">(</span><span class="n">base_path</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">package</span><span class="p">:</span>
<span class="n">cffi_wrapper_name</span> <span class="o">=</span> <span class="s1">'_'</span> <span class="o">+</span> <span class="n">name_suffix</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">cffi_wrapper_name</span> <span class="o">=</span> <span class="p">(</span><span class="n">name</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s1">'.'</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span>
<span class="s1">'.</span><span class="si">{0}</span><span class="s1">._</span><span class="si">{0}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">name_suffix</span><span class="p">))</span>
<span class="n">wrapper_source</span><span class="p">,</span> <span class="n">include_dirs</span> <span class="o">=</span> <span class="n">_setup_wrapper</span><span class="p">(</span><span class="n">with_cuda</span><span class="p">)</span>
<span class="n">include_dirs</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'include_dirs'</span><span class="p">,</span> <span class="p">[]))</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">headers</span><span class="p">,</span> <span class="nb">str</span><span class="p">):</span>
<span class="n">headers</span> <span class="o">=</span> <span class="p">[</span><span class="n">headers</span><span class="p">]</span>
<span class="n">all_headers_source</span> <span class="o">=</span> <span class="s1">''</span>
<span class="k">for</span> <span class="n">header</span> <span class="ow">in</span> <span class="n">headers</span><span class="p">:</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">base_path</span><span class="p">,</span> <span class="n">header</span><span class="p">),</span> <span class="s1">'r'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">all_headers_source</span> <span class="o">+=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span> <span class="o">+</span> <span class="s1">'</span><span class="se">\n\n</span><span class="s1">'</span>
<span class="n">ffi</span> <span class="o">=</span> <span class="n">cffi</span><span class="o">.</span><span class="n">FFI</span><span class="p">()</span>
<span class="n">sources</span> <span class="o">=</span> <span class="p">[</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">base_path</span><span class="p">,</span> <span class="n">src</span><span class="p">)</span> <span class="k">for</span> <span class="n">src</span> <span class="ow">in</span> <span class="n">sources</span><span class="p">]</span>
<span class="n">ffi</span><span class="o">.</span><span class="n">set_source</span><span class="p">(</span><span class="n">cffi_wrapper_name</span><span class="p">,</span> <span class="n">wrapper_source</span> <span class="o">+</span> <span class="n">all_headers_source</span><span class="p">,</span>
<span class="n">sources</span><span class="o">=</span><span class="n">sources</span><span class="p">,</span>
<span class="n">include_dirs</span><span class="o">=</span><span class="n">include_dirs</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="n">ffi</span><span class="o">.</span><span class="n">cdef</span><span class="p">(</span><span class="n">_typedefs</span> <span class="o">+</span> <span class="n">all_headers_source</span><span class="p">)</span>
<span class="n">_make_python_wrapper</span><span class="p">(</span><span class="n">name_suffix</span><span class="p">,</span> <span class="s1">'_'</span> <span class="o">+</span> <span class="n">name_suffix</span><span class="p">,</span> <span class="n">target_dir</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">build</span><span class="p">():</span>
<span class="n">_build_extension</span><span class="p">(</span><span class="n">ffi</span><span class="p">,</span> <span class="n">cffi_wrapper_name</span><span class="p">,</span> <span class="n">target_dir</span><span class="p">,</span> <span class="n">verbose</span><span class="p">)</span>
<span class="n">ffi</span><span class="o">.</span><span class="n">build</span> <span class="o">=</span> <span class="n">build</span>
<span class="k">return</span> <span class="n">ffi</span></div>
<span class="k">def</span> <span class="nf">_wrap_function</span><span class="p">(</span><span class="n">function</span><span class="p">,</span> <span class="n">ffi</span><span class="p">):</span>
<span class="nd">@wraps</span><span class="p">(</span><span class="n">function</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">safe_call</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">args</span> <span class="o">=</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">ffi</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="n">_torch_to_cffi</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">arg</span><span class="p">),</span> <span class="s1">'void'</span><span class="p">)</span> <span class="o">+</span> <span class="s1">'*'</span><span class="p">,</span> <span class="n">arg</span><span class="o">.</span><span class="n">_cdata</span><span class="p">)</span>
<span class="k">if</span> <span class="n">torch</span><span class="o">.</span><span class="n">is_tensor</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="ow">or</span> <span class="n">torch</span><span class="o">.</span><span class="n">is_storage</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span>
<span class="k">else</span> <span class="n">arg</span>
<span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">args</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="p">(</span><span class="n">function</span><span class="p">,)</span> <span class="o">+</span> <span class="n">args</span>
<span class="n">result</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_safe_call</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">ffi</span><span class="o">.</span><span class="n">CData</span><span class="p">):</span>
<span class="n">typeof</span> <span class="o">=</span> <span class="n">ffi</span><span class="o">.</span><span class="n">typeof</span><span class="p">(</span><span class="n">result</span><span class="p">)</span>
<span class="k">if</span> <span class="n">typeof</span><span class="o">.</span><span class="n">kind</span> <span class="o">==</span> <span class="s1">'pointer'</span><span class="p">:</span>
<span class="n">cdata</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">ffi</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="s1">'uintptr_t'</span><span class="p">,</span> <span class="n">result</span><span class="p">))</span>
<span class="n">cname</span> <span class="o">=</span> <span class="n">typeof</span><span class="o">.</span><span class="n">item</span><span class="o">.</span><span class="n">cname</span>
<span class="k">if</span> <span class="n">cname</span> <span class="ow">in</span> <span class="n">_cffi_to_torch</span><span class="p">:</span>
<span class="k">return</span> <span class="n">_cffi_to_torch</span><span class="p">[</span><span class="n">cname</span><span class="p">](</span><span class="n">cdata</span><span class="o">=</span><span class="n">cdata</span><span class="p">)</span>
<span class="k">return</span> <span class="n">result</span>
<span class="k">return</span> <span class="n">safe_call</span>
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