Initial support for nogil extension C code generation

Cython/Compiler/ExprNodes.py

@@ -674,6 +674,8 @@ class ExprNode(Node):
             self.gil_error()
 
     def gil_assignment_check(self, env):
+        if self.type == PyrexTypes.PyExtensionType and env.nogil and self.type.nogil:
+            error("No gil type in no gil function")
         if env.nogil and self.type.is_pyobject:
             error(self.pos, "Assignment of Python object not allowed without gil")
 
@@ -1665,6 +1667,9 @@ class StringNode(PyConstNode):
     is_identifier = None
     unicode_value = None
 
+    # XXX: Let the StringNode can be used in nogil extension initializing
+    nogil_check = None
+
     def calculate_constant_result(self):
         if self.unicode_value is not None:
             # only the Unicode value is portable across Py2/3
@@ -2258,6 +2263,9 @@ class NameNode(AtomicExprNode):
                         code.error_goto_if_null(self.result(), self.pos)))
             code.put_gotref(self.py_result())
 
+        elif entry.is_local and isinstance(entry.type, PyrexTypes.CythonExtensionType):
+            pass
+            # code.putln(entry.cname)
         elif entry.is_local or entry.in_closure or entry.from_closure or entry.type.is_memoryviewslice:
             # Raise UnboundLocalError for objects and memoryviewslices
             raise_unbound = (
@@ -5473,6 +5481,18 @@ class CallNode(ExprNode):
             self.analyse_c_function_call(env)
             self.type = type
             return True
+        elif type and type.is_struct and type.nogil:
+            args, kwds = self.explicit_args_kwds()
+            items = []
+            for arg, member in zip(args, type.scope.var_entries):
+                items.append(DictItemNode(pos=arg.pos, key=StringNode(pos=arg.pos, value=member.name), value=arg))
+            if kwds:
+                items += kwds.key_value_pairs
+            self.key_value_pairs = items
+            self.__class__ = DictNode
+            self.analyse_types(env)    # FIXME
+            self.coerce_to(type, env)
+            return True
 
     def is_lvalue(self):
         return self.type.is_reference
@@ -7192,6 +7212,9 @@ class AttributeNode(ExprNode):
                     # (AnalyseExpressionsTransform)
                     self.member = self.entry.cname
 
+                if obj.type.nogil:
+                    return "%s" % self.entry.func_cname
+                else:
                     return "((struct %s *)%s%s%s)->%s" % (
                         obj.type.vtabstruct_cname, obj_code, self.op,
                         obj.type.vtabslot_cname, self.member)
@@ -8847,6 +8870,11 @@ class DictNode(ExprNode):
                     code.putln('}')
                 if self.exclude_null_values:
                     code.putln('}')
+            elif self.type.nogil:
+                code.putln("%s->%s = %s;" % (
+                        self.result(),
+                        item.key.value,
+                        item.value.result()))
             else:
                 code.putln("%s.%s = %s;" % (
                         self.result(),

Cython/Compiler/ModuleNode.py

@@ -1123,6 +1123,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
             self.sue_header_footer(type, "struct", type.objstruct_cname)
         code.putln(header)
         base_type = type.base_type
+        nogil = type.nogil
         if base_type:
             basestruct_cname = base_type.objstruct_cname
             if basestruct_cname == "PyTypeObject":
@@ -1133,6 +1134,14 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
                     ("struct ", "")[base_type.typedef_flag],
                     basestruct_cname,
                     Naming.obj_base_cname))
+        elif nogil:
+            # Extension type with nogil keyword indicate it is a CPython-free struct
+            code.putln(
+                "// nogil"
+            )
+            code.putln(
+                "size_t ob_refcnt;"
+            )
         else:
             code.putln(
                 "PyObject_HEAD")

Cython/Compiler/Nodes.py

@@ -3321,6 +3321,8 @@ class DefNodeWrapper(FuncDefNode):
         # different code types.
         for arg in self.args:
             if not arg.type.is_pyobject:
+                if arg.type is PyrexTypes.PyExtensionType and arg.type.nogil:
+                    continue # XXX maybe here is not the correct place to put it...
                 if not arg.type.create_from_py_utility_code(env):
                     pass # will fail later
             elif arg.hdr_type and not arg.hdr_type.is_pyobject:
@@ -4724,6 +4726,7 @@ class CClassDefNode(ClassDefNode):
     #  doc                string or None
     #  body               StatNode or None
     #  entry              Symtab.Entry
+    #  nogil              boolean
     #  base_type          PyExtensionType or None
     #  buffer_defaults_node DictNode or None Declares defaults for a buffer
     #  buffer_defaults_pos
@@ -4733,6 +4736,7 @@ class CClassDefNode(ClassDefNode):
     buffer_defaults_pos = None
     typedef_flag = False
     api = False
+    nogil = False
     objstruct_name = None
     typeobj_name = None
     check_size = None
@@ -4773,6 +4777,7 @@ class CClassDefNode(ClassDefNode):
             typedef_flag=self.typedef_flag,
             check_size = self.check_size,
             api=self.api,
+            nogil=self.nogil,
             buffer_defaults=self.buffer_defaults(env),
             shadow=self.shadow)
 
@@ -4861,6 +4866,7 @@ class CClassDefNode(ClassDefNode):
             visibility=self.visibility,
             typedef_flag=self.typedef_flag,
             api=self.api,
+            nogil=self.nogil,
             buffer_defaults=self.buffer_defaults(env),
             shadow=self.shadow)
 

Cython/Compiler/ParseTreeTransforms.py

@@ -1630,6 +1630,7 @@ if VALUE is not None:
             if stats:
                 node.body.stats += stats
             if (node.visibility != 'extern'
+                and not node.nogil
                 and not node.scope.lookup('__reduce__')
                 and not node.scope.lookup('__reduce_ex__')):
                 self._inject_pickle_methods(node)

Cython/Compiler/Symtab.py

@@ -1501,7 +1501,7 @@ class ModuleScope(Scope):
     def declare_c_class(self, name, pos, defining=0, implementing=0,
             module_name=None, base_type=None, objstruct_cname=None,
             typeobj_cname=None, typeptr_cname=None, visibility='private',
-            typedef_flag=0, api=0, check_size=None,
+            typedef_flag=0, api=0, nogil=0, check_size=None,
             buffer_defaults=None, shadow=0):
         # If this is a non-extern typedef class, expose the typedef, but use
         # the non-typedef struct internally to avoid needing forward
@@ -1534,8 +1534,15 @@ class ModuleScope(Scope):
         #  Make a new entry if needed
         #
         if not entry or shadow:
+            if nogil:
+                pass
+            if nogil:
+                type = PyrexTypes.CythonExtensionType(
+                        name, typedef_flag, base_type, visibility == 'extern', check_size=check_size)
+            else:
                 type = PyrexTypes.PyExtensionType(
                         name, typedef_flag, base_type, visibility == 'extern', check_size=check_size)
+            type.nogil = nogil
             type.pos = pos
             type.buffer_defaults = buffer_defaults
             if objtypedef_cname is not None: