implement ticket #650: substitute PyErr_NoMemory() for 'raise MemoryError()'

Cython/Compiler/Nodes.py

@@ -3935,12 +3935,26 @@ class RaiseStatNode(StatNode):
         if self.exc_tb:
             self.exc_tb.analyse_types(env)
             self.exc_tb = self.exc_tb.coerce_to_pyobject(env)
-        env.use_utility_code(raise_utility_code)
+        # special cases for builtin exceptions
+        self.builtin_exc_name = None
+        if self.exc_type and not self.exc_value and not self.exc_tb:
+            exc = self.exc_type
+            import ExprNodes
+            if isinstance(exc, ExprNodes.SimpleCallNode) and not exc.args:
+                exc = exc.function # extract the exception type
+            if exc.is_name and exc.entry.is_builtin:
+                self.builtin_exc_name = exc.name
+                if self.builtin_exc_name == 'MemoryError':
+                    self.exc_type = None # has a separate implementation
 
     nogil_check = Node.gil_error
     gil_message = "Raising exception"
 
     def generate_execution_code(self, code):
+        if self.builtin_exc_name == 'MemoryError':
+            code.putln('PyErr_NoMemory(); %s' % code.error_goto(self.pos))
+            return
+
         if self.exc_type:
             self.exc_type.generate_evaluation_code(code)
             type_code = self.exc_type.py_result()
@@ -3956,6 +3970,7 @@ class RaiseStatNode(StatNode):
             tb_code = self.exc_tb.py_result()
         else:
             tb_code = "0"
+        code.globalstate.use_utility_code(raise_utility_code)
         code.putln(
             "__Pyx_Raise(%s, %s, %s);" % (
                 type_code,

tests/run/raise_memory_error_T650.pyx

+
+cimport cython
+
+@cython.test_assert_path_exists(
+    '//RaiseStatNode',
+    '//RaiseStatNode[@builtin_exc_name = "MemoryError"]')
+def raise_me_type():
+    """
+    >>> try: raise_me_type()
+    ... except MemoryError: pass
+    ... else: print('NOT RAISED!')
+    """
+    raise MemoryError
+
+@cython.test_assert_path_exists(
+    '//RaiseStatNode',
+    '//RaiseStatNode[@builtin_exc_name = "MemoryError"]')
+def raise_me_instance():
+    """
+    >>> try: raise_me_instance()
+    ... except MemoryError: pass
+    ... else: print('NOT RAISED!')
+    """
+    raise MemoryError()