Resolve symbol errors with Python 3.12

    Symbols missing in /opt/hostedtoolcache/Python/3.12.4/x64/lib/libpython3.12.so:
    PyCode_New
    PyCode_NewWithPosOnlyArgs
    PyUnicode_AsUnicode
    PyUnicode_AsUnicodeAndSize
    PyUnicode_FromUnicode
    _Py_GetAllocatedBlocks
    _Py_PackageContext

Python 3.12/3.11 renamed/deprecated some APIs. Update code to skip them.
This affects `linux (ubuntu-latest, 3.12, nightly)` CI.

Author: quark-zju

python3-sys/src/code.rs

@@ -152,6 +152,7 @@ pub const CO_MAXBLOCKS: usize = 20;
 extern "C" {
     pub static mut PyCode_Type: PyTypeObject;
 
+    #[cfg_attr(Py_3_12, link_name = "PyUnstable_Code_New")]
     pub fn PyCode_New(
         argcount: c_int,
         kwonlyargcount: c_int,
@@ -175,6 +176,7 @@ extern "C" {
     ) -> *mut PyCodeObject;
 
     #[cfg(Py_3_8)]
+    #[cfg_attr(Py_3_12, link_name = "PyUnstable_Code_NewWithPosOnlyArgs")]
     pub fn PyCode_NewWithPosOnlyArgs(
         argcount: c_int,
         posonlyargcount: c_int,

python3-sys/src/modsupport.rs

@@ -133,7 +133,7 @@ pub unsafe fn PyModule_FromDefAndSpec(def: *mut PyModuleDef, spec: *mut PyObject
     )
 }
 
-#[cfg(not(Py_LIMITED_API))]
+#[cfg(all(not(Py_LIMITED_API), not(Py_3_12)))]
 #[cfg_attr(windows, link(name = "pythonXY"))]
 extern "C" {
     pub static mut _Py_PackageContext: *const c_char;

python3-sys/src/objimpl.rs

@@ -21,7 +21,7 @@ extern "C" {
     #[cfg(all(py_sys_config = "Py_DEBUG", not(Py_3_4)))]
     pub fn _PyObject_DebugFree(arg1: *mut c_void);
 
-    #[cfg(all(not(Py_LIMITED_API), Py_3_4))]
+    #[cfg(all(not(Py_LIMITED_API), Py_3_4, not(Py_3_11)))]
     pub fn _Py_GetAllocatedBlocks() -> Py_ssize_t;
     pub fn PyObject_Init(arg1: *mut PyObject, arg2: *mut PyTypeObject) -> *mut PyObject;
     pub fn PyObject_InitVar(

python3-sys/src/unicodeobject.rs

@@ -52,7 +52,7 @@ extern "C" {
         length: Py_ssize_t,
         fill_char: Py_UCS4,
     ) -> Py_ssize_t;
-    #[cfg(not(Py_LIMITED_API))]
+    #[cfg(all(not(Py_LIMITED_API), not(Py_3_12)))]
     #[deprecated(since = "0.2.1", note = "Deprecated since Python 3.3 / PEP 393")]
     pub fn PyUnicode_FromUnicode(u: *const Py_UNICODE, size: Py_ssize_t) -> *mut PyObject;
 
@@ -78,10 +78,10 @@ extern "C" {
         copy_null: c_int,
     ) -> *mut Py_UCS4;
     pub fn PyUnicode_AsUCS4Copy(unicode: *mut PyObject) -> *mut Py_UCS4;
-    #[cfg(not(Py_LIMITED_API))]
+    #[cfg(all(not(Py_LIMITED_API), not(Py_3_12)))]
     #[deprecated(since = "0.2.1", note = "Deprecated since Python 3.3 / PEP 393")]
     pub fn PyUnicode_AsUnicode(unicode: *mut PyObject) -> *mut Py_UNICODE;
-    #[cfg(not(Py_LIMITED_API))]
+    #[cfg(all(not(Py_LIMITED_API), not(Py_3_12)))]
     #[deprecated(since = "0.2.1", note = "Deprecated since Python 3.3 / PEP 393")]
     pub fn PyUnicode_AsUnicodeAndSize(
         unicode: *mut PyObject,

tests/check_symbols.py

@@ -89,12 +89,19 @@ def match_braces(text):
         foreign_sections.append(asttree[:endpos])
         asttree = asttree[endpos:]
 
+renames = {}
+if sys.version_info >= (3, 12):
+    # Those renames were declared by cfg_attr(Py_3_12, link_name = ...) but it's hard to parse them from AST.
+    renames.update({"PyCode_New": "PyUnstable_Code_New", "PyCode_NewWithPosOnlyArgs": "PyUnstable_Code_NewWithPosOnlyArgs"})
+
 for section in foreign_sections:
     lines = section.split('\n')
     for idx in range(len(lines)):
         line = lines[idx]
         if ('kind: Fn(' in line) or ('kind: Static(' in line):
-            foreign_symbols.add(re.sub(r'\s*ident: (.*)#[0-9]*,', r'\1', lines[idx-1]))
+            name = re.sub(r'\s*ident: (.*)#[0-9]*,', r'\1', lines[idx-1])
+            name = renames.get(name) or name
+            foreign_symbols.add(name)
 
 assert 'PyList_Type' in foreign_symbols, "Failed getting statics from rustc -Z unpretty=ast-tree,expanded"
 assert 'PyList_New' in foreign_symbols, "Failed getting functions from rustc -Z unpretty=ast-tree,expanded"