From 62802b6228f001e1a4af6ac668a21d2dcec0ce57 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 15 Nov 2023 01:19:20 +0100
Subject: gh-111545: Add Include/cpython/pyhash.h header file (#112063)

Move non-limited C API to a new Include/cpython/pyhash.h header file.
---
 Include/cpython/pyhash.h           | 13 +++++++++++++
 Include/pyhash.h                   | 19 ++++++-------------
 Makefile.pre.in                    |  1 +
 PCbuild/pythoncore.vcxproj         |  1 +
 PCbuild/pythoncore.vcxproj.filters |  3 +++
 5 files changed, 24 insertions(+), 13 deletions(-)
 create mode 100644 Include/cpython/pyhash.h

diff --git a/Include/cpython/pyhash.h b/Include/cpython/pyhash.h
new file mode 100644
index 0000000..62ae608
--- /dev/null
+++ b/Include/cpython/pyhash.h
@@ -0,0 +1,13 @@
+#ifndef Py_CPYTHON_HASH_H
+#  error "this header file must not be included directly"
+#endif
+
+/* hash function definition */
+typedef struct {
+    Py_hash_t (*const hash)(const void *, Py_ssize_t);
+    const char *name;
+    const int hash_bits;
+    const int seed_bits;
+} PyHash_FuncDef;
+
+PyAPI_FUNC(PyHash_FuncDef*) PyHash_GetFuncDef(void);
diff --git a/Include/pyhash.h b/Include/pyhash.h
index 6e969f8..3e23e275 100644
--- a/Include/pyhash.h
+++ b/Include/pyhash.h
@@ -4,19 +4,6 @@
 extern "C" {
 #endif
 
-#ifndef Py_LIMITED_API
-/* hash function definition */
-typedef struct {
-    Py_hash_t (*const hash)(const void *, Py_ssize_t);
-    const char *name;
-    const int hash_bits;
-    const int seed_bits;
-} PyHash_FuncDef;
-
-PyAPI_FUNC(PyHash_FuncDef*) PyHash_GetFuncDef(void);
-#endif
-
-
 /* Cutoff for small string DJBX33A optimization in range [1, cutoff).
  *
  * About 50% of the strings in a typical Python application are smaller than
@@ -60,6 +47,12 @@ PyAPI_FUNC(PyHash_FuncDef*) PyHash_GetFuncDef(void);
 #  endif /* uint64_t && uint32_t && aligned */
 #endif /* Py_HASH_ALGORITHM */
 
+#ifndef Py_LIMITED_API
+#  define Py_CPYTHON_HASH_H
+#  include "cpython/pyhash.h"
+#  undef Py_CPYTHON_HASH_H
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/Makefile.pre.in b/Makefile.pre.in
index a74cb7e..4fa0337 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1768,6 +1768,7 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/cpython/pyerrors.h \
 		$(srcdir)/Include/cpython/pyfpe.h \
 		$(srcdir)/Include/cpython/pyframe.h \
+		$(srcdir)/Include/cpython/pyhash.h \
 		$(srcdir)/Include/cpython/pylifecycle.h \
 		$(srcdir)/Include/cpython/pymem.h \
 		$(srcdir)/Include/cpython/pystate.h \
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index f6fbd0f..be1b98d 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -172,6 +172,7 @@
     <ClInclude Include="..\Include\cpython\pyerrors.h" />
     <ClInclude Include="..\Include\cpython\pyfpe.h" />
     <ClInclude Include="..\Include\cpython\pyframe.h" />
+    <ClInclude Include="..\Include\cpython\pyhash.h" />
     <ClInclude Include="..\Include\cpython\pylifecycle.h" />
     <ClInclude Include="..\Include\cpython\pymem.h" />
     <ClInclude Include="..\Include\cpython\pystate.h" />
diff --git a/PCbuild/pythoncore.vcxproj.filters b/PCbuild/pythoncore.vcxproj.filters
index eb7ba04..4f0da8f 100644
--- a/PCbuild/pythoncore.vcxproj.filters
+++ b/PCbuild/pythoncore.vcxproj.filters
@@ -468,6 +468,9 @@
     <ClInclude Include="..\Include\cpython\pyframe.h">
       <Filter>Include\cpython</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\cpython\pyhash.h">
+      <Filter>Include\cpython</Filter>
+    </ClInclude>
     <ClInclude Include="..\Include\cpython\pylifecycle.h">
       <Filter>Include\cpython</Filter>
     </ClInclude>
-- 
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