bpo-35134: Remove the Include/code.h header file (GH-32385)

Remove the Include/code.h header file. C extensions should only
include the main <Python.h> header file.

Python.h includes directly Include/cpython/code.h instead.

Author: vstinner

Doc/whatsnew/3.11.rst

@@ -1210,7 +1210,7 @@ Porting to Python 3.11
   explicitly include the header files after ``#include <Python.h>``.
   (Contributed by Victor Stinner in :issue:`45434`.)
 
-* The non-limited API files ``cellobject.h``, ``classobject.h``, ``context.h``,
+* The non-limited API files ``cellobject.h``, ``classobject.h``, ``code.h``, ``context.h``,
   ``funcobject.h``, ``genobject.h`` and ``longintrepr.h`` have been moved to
   the ``Include/cpython`` directory. Moreover, the ``eval.h`` header file was
   removed. These files must not be included directly, as they are already

Include/Python.h

@@ -68,7 +68,7 @@
 #include "cpython/classobject.h"
 #include "fileobject.h"
 #include "pycapsule.h"
-#include "code.h"
+#include "cpython/code.h"
 #include "pyframe.h"
 #include "traceback.h"
 #include "sliceobject.h"

Include/code.h

@@ -1,5 +1,10 @@
-#ifndef Py_CPYTHON_CODE_H
-#  error "this header file must not be included directly"
+/* Definitions for bytecode */
+
+#ifndef Py_LIMITED_API
+#ifndef Py_CODE_H
+#define Py_CODE_H
+#ifdef __cplusplus
+extern "C" {
 #endif
 
 /* Each instruction in a code object is a fixed-width value,
@@ -204,3 +209,9 @@ PyAPI_FUNC(int) _PyCode_GetExtra(PyObject *code, Py_ssize_t index,
                                  void **extra);
 PyAPI_FUNC(int) _PyCode_SetExtra(PyObject *code, Py_ssize_t index,
                                  void *extra);
+
+#ifdef __cplusplus
+}
+#endif
+#endif  // !Py_CODE_H
+#endif  // !Py_LIMITED_API

Include/cpython/code.h

@@ -1450,7 +1450,6 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/bytearrayobject.h \
 		$(srcdir)/Include/bytesobject.h \
 		$(srcdir)/Include/ceval.h \
-		$(srcdir)/Include/code.h \
 		$(srcdir)/Include/codecs.h \
 		$(srcdir)/Include/compile.h \
 		$(srcdir)/Include/complexobject.h \

Makefile.pre.in

@@ -0,0 +1,2 @@
+Remove the ``Include/code.h`` header file. C extensions should only include
+the main ``<Python.h>`` header file. Patch by Victor Stinner.

Misc/NEWS.d/next/C API/2022-04-07-00-53-51.bpo-35134.zSjIzk.rst

@@ -1,7 +1,6 @@
 #include <stdbool.h>
 
 #include "Python.h"
-#include "code.h"
 #include "opcode.h"
 #include "structmember.h"         // PyMemberDef
 #include "pycore_code.h"          // _PyCodeConstructor

Objects/codeobject.c

@@ -129,7 +129,6 @@
     <ClInclude Include="..\Include\bytearrayobject.h" />
     <ClInclude Include="..\Include\bytesobject.h" />
     <ClInclude Include="..\Include\ceval.h" />
-    <ClInclude Include="..\Include\code.h" />
     <ClInclude Include="..\Include\codecs.h" />
     <ClInclude Include="..\Include\compile.h" />
     <ClInclude Include="..\Include\complexobject.h" />

PCbuild/pythoncore.vcxproj

@@ -132,9 +132,6 @@
     <ClInclude Include="..\Include\objimpl.h">
       <Filter>Include</Filter>
     </ClInclude>
-    <ClInclude Include="..\Include\opcode.h">
-      <Filter>Include</Filter>
-    </ClInclude>
     <ClInclude Include="..\Include\osdefs.h">
       <Filter>Include</Filter>
     </ClInclude>

PCbuild/pythoncore.vcxproj.filters

@@ -23,7 +23,6 @@
 #include "pycore_tuple.h"         // _PyTuple_ITEMS()
 #include "pycore_emscripten_signal.h"  // _Py_CHECK_EMSCRIPTEN_SIGNALS
 
-#include "code.h"
 #include "pycore_dict.h"
 #include "dictobject.h"
 #include "frameobject.h"