gh-89653: PEP 670: Convert unicodeobject.h macros to functions (#91705)

Convert unicodeobject.h macros to static inline functions:

* PyUnicode_CHECK_INTERNED()
* PyUnicode_DATA(), _PyUnicode_COMPACT_DATA(),
  _PyUnicode_NONCOMPACT_DATA()
* PyUnicode_GET_LENGTH()
* PyUnicode_IS_ASCII()
* PyUnicode_IS_COMPACT()
* PyUnicode_IS_COMPACT_ASCII()
* PyUnicode_IS_READY()

Reorder functions to declare functions before their first usage.

Static inline functions are wrapped by macros which casts
arguments with _PyObject_CAST() to prevent introducing
new compiler warnings when passing "const PyObject*".

Include/cpython/unicodeobject.h

@@ -287,37 +287,80 @@ PyAPI_FUNC(int) _PyUnicode_CheckConsistency(
 #define SSTATE_INTERNED_IMMORTAL 2
 
 /* Use only if you know it's a string */
-#define PyUnicode_CHECK_INTERNED(op) \
-    (_PyASCIIObject_CAST(op)->state.interned)
+static inline unsigned int PyUnicode_CHECK_INTERNED(PyObject *op) {
+    return _PyASCIIObject_CAST(op)->state.interned;
+}
+#define PyUnicode_CHECK_INTERNED(op) PyUnicode_CHECK_INTERNED(_PyObject_CAST(op))
+
+/* Fast check to determine whether an object is ready. Equivalent to:
+   PyUnicode_IS_COMPACT(op) || _PyUnicodeObject_CAST(op)->data.any */
+static inline unsigned int PyUnicode_IS_READY(PyObject *op) {
+    return _PyASCIIObject_CAST(op)->state.ready;
+}
+#define PyUnicode_IS_READY(op) PyUnicode_IS_READY(_PyObject_CAST(op))
 
 /* Return true if the string contains only ASCII characters, or 0 if not. The
    string may be compact (PyUnicode_IS_COMPACT_ASCII) or not, but must be
    ready. */
-#define PyUnicode_IS_ASCII(op)                   \
-    (assert(PyUnicode_IS_READY(op)),             \
-     _PyASCIIObject_CAST(op)->state.ascii)
+static inline unsigned int PyUnicode_IS_ASCII(PyObject *op) {
+    assert(PyUnicode_IS_READY(op));
+    return _PyASCIIObject_CAST(op)->state.ascii;
+}
+#define PyUnicode_IS_ASCII(op) PyUnicode_IS_ASCII(_PyObject_CAST(op))
 
 /* Return true if the string is compact or 0 if not.
    No type checks or Ready calls are performed. */
-#define PyUnicode_IS_COMPACT(op) \
-    (_PyASCIIObject_CAST(op)->state.compact)
+static inline unsigned int PyUnicode_IS_COMPACT(PyObject *op) {
+    return _PyASCIIObject_CAST(op)->state.compact;
+}
+#define PyUnicode_IS_COMPACT(op) PyUnicode_IS_COMPACT(_PyObject_CAST(op))
 
 /* Return true if the string is a compact ASCII string (use PyASCIIObject
    structure), or 0 if not.  No type checks or Ready calls are performed. */
-#define PyUnicode_IS_COMPACT_ASCII(op)                 \
-    (_PyASCIIObject_CAST(op)->state.ascii && PyUnicode_IS_COMPACT(op))
+static inline int PyUnicode_IS_COMPACT_ASCII(PyObject *op) {
+    return (_PyASCIIObject_CAST(op)->state.ascii && PyUnicode_IS_COMPACT(op));
+}
+#define PyUnicode_IS_COMPACT_ASCII(op) PyUnicode_IS_COMPACT_ASCII(_PyObject_CAST(op))
 
 enum PyUnicode_Kind {
 /* String contains only wstr byte characters.  This is only possible
    when the string was created with a legacy API and _PyUnicode_Ready()
    has not been called yet.  */
     PyUnicode_WCHAR_KIND = 0,
-/* Return values of the PyUnicode_KIND() macro: */
+/* Return values of the PyUnicode_KIND() function: */
     PyUnicode_1BYTE_KIND = 1,
     PyUnicode_2BYTE_KIND = 2,
     PyUnicode_4BYTE_KIND = 4
 };
 
+/* Return one of the PyUnicode_*_KIND values defined above. */
+#define PyUnicode_KIND(op) \
+    (assert(PyUnicode_Check(op)), \
+     assert(PyUnicode_IS_READY(op)), \
+     ((PyASCIIObject *)(op))->state.kind)
+
+/* Return a void pointer to the raw unicode buffer. */
+static inline void* _PyUnicode_COMPACT_DATA(PyObject *op) {
+    if (PyUnicode_IS_ASCII(op)) {
+        return (void*)(_PyASCIIObject_CAST(op) + 1);
+    }
+    return (void*)(_PyCompactUnicodeObject_CAST(op) + 1);
+}
+
+static inline void* _PyUnicode_NONCOMPACT_DATA(PyObject *op) {
+    void *data = _PyUnicodeObject_CAST(op)->data.any;
+    assert(data != NULL);
+    return data;
+}
+
+static inline void* PyUnicode_DATA(PyObject *op) {
+    if (PyUnicode_IS_COMPACT(op)) {
+        return _PyUnicode_COMPACT_DATA(op);
+    }
+    return _PyUnicode_NONCOMPACT_DATA(op);
+}
+#define PyUnicode_DATA(op) PyUnicode_DATA(_PyObject_CAST(op))
+
 /* Return pointers to the canonical representation cast to unsigned char,
    Py_UCS2, or Py_UCS4 for direct character access.
    No checks are performed, use PyUnicode_KIND() before to ensure
@@ -327,24 +370,14 @@ enum PyUnicode_Kind {
 #define PyUnicode_2BYTE_DATA(op) ((Py_UCS2*)PyUnicode_DATA(op))
 #define PyUnicode_4BYTE_DATA(op) ((Py_UCS4*)PyUnicode_DATA(op))
 
-/* Return one of the PyUnicode_*_KIND values defined above. */
-#define PyUnicode_KIND(op) \
-    (assert(PyUnicode_IS_READY(op)),            \
-     _PyASCIIObject_CAST(op)->state.kind)
-
-/* Return a void pointer to the raw unicode buffer. */
-#define _PyUnicode_COMPACT_DATA(op)                     \
-    (PyUnicode_IS_ASCII(op) ?                           \
-     ((void*)(_PyASCIIObject_CAST(op) + 1)) :           \
-     ((void*)(_PyCompactUnicodeObject_CAST(op) + 1)))
-
-#define _PyUnicode_NONCOMPACT_DATA(op)                  \
-    (assert(_PyUnicodeObject_CAST(op)->data.any),       \
-     (_PyUnicodeObject_CAST(op)->data.any))
-
-#define PyUnicode_DATA(op) \
-    (PyUnicode_IS_COMPACT(op) ? _PyUnicode_COMPACT_DATA(op) :   \
-     _PyUnicode_NONCOMPACT_DATA(op))
+/* Returns the length of the unicode string. The caller has to make sure that
+   the string has it's canonical representation set before calling
+   this function.  Call PyUnicode_(FAST_)Ready to ensure that. */
+static inline Py_ssize_t PyUnicode_GET_LENGTH(PyObject *op) {
+    assert(PyUnicode_IS_READY(op));
+    return _PyASCIIObject_CAST(op)->length;
+}
+#define PyUnicode_GET_LENGTH(op) PyUnicode_GET_LENGTH(_PyObject_CAST(op))
 
 /* In the access macros below, "kind" may be evaluated more than once.
    All other macro parameters are evaluated exactly once, so it is safe
@@ -400,19 +433,6 @@ enum PyUnicode_Kind {
             ) \
         ))
 
-/* Returns the length of the unicode string. The caller has to make sure that
-   the string has it's canonical representation set before calling
-   this macro.  Call PyUnicode_(FAST_)Ready to ensure that. */
-#define PyUnicode_GET_LENGTH(op)                \
-    (assert(PyUnicode_IS_READY(op)),            \
-     _PyASCIIObject_CAST(op)->length)
-
-
-/* Fast check to determine whether an object is ready. Equivalent to
-   PyUnicode_IS_COMPACT(op) || _PyUnicodeObject_CAST(op)->data.any */
-
-#define PyUnicode_IS_READY(op) (_PyASCIIObject_CAST(op)->state.ready)
-
 /* PyUnicode_READY() does less work than _PyUnicode_Ready() in the best
    case.  If the canonical representation is not yet set, it will still call
    _PyUnicode_Ready().