gh-107211: No longer export internal functions (7)

No longer export these 3 internal C API functions:

* _PyUnicode_EncodeUTF16()
* _PyUnicode_EncodeUTF32()
* _PyUnicode_FromId()

Change comment style to "// comment" and add comment explaining why
other functions have to be exported.

Author: vstinner

Include/internal/pycore_pylifecycle.h

@@ -98,16 +98,20 @@ extern int _Py_FdIsInteractive(FILE *fp, PyObject *filename);
 extern const char* _Py_gitidentifier(void);
 extern const char* _Py_gitversion(void);
 
+// Export for '_asyncio' shared extension
 PyAPI_FUNC(int) _Py_IsInterpreterFinalizing(PyInterpreterState *interp);
 
 /* Random */
 extern int _PyOS_URandom(void *buffer, Py_ssize_t size);
+
 // Export for '_random' shared extension
 PyAPI_FUNC(int) _PyOS_URandomNonblock(void *buffer, Py_ssize_t size);
 
 /* Legacy locale support */
 extern int _Py_CoerceLegacyLocale(int warn);
 extern int _Py_LegacyLocaleDetected(int warn);
+
+// Export for 'readline' shared extension
 PyAPI_FUNC(char*) _Py_SetLocaleFromEnv(int category);
 
 #ifdef __cplusplus

Include/internal/pycore_pystate.h

@@ -66,6 +66,9 @@ _Py_ThreadCanHandleSignals(PyInterpreterState *interp)
 #if defined(HAVE_THREAD_LOCAL) && !defined(Py_BUILD_CORE_MODULE)
 extern _Py_thread_local PyThreadState *_Py_tss_tstate;
 #endif
+
+// Export for most shared extensions, used via _PyThreadState_GET() static
+// inline function.
 PyAPI_FUNC(PyThreadState *) _PyThreadState_GetCurrent(void);
 
 /* Get the current Python thread state.

Include/internal/pycore_runtime.h

@@ -272,6 +272,9 @@ typedef struct pyruntimestate {
 
 /* other API */
 
+// Export _PyRuntime for shared extensions which use it in static inline
+// functions for best performance, like _Py_IsMainThread() or _Py_ID().
+// It's also made accessible for debuggers and profilers.
 PyAPI_DATA(_PyRuntimeState) _PyRuntime;
 
 extern PyStatus _PyRuntimeState_Init(_PyRuntimeState *runtime);

Include/internal/pycore_setobject.h

@@ -8,17 +8,17 @@ extern "C" {
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
-// Export for 'pickle' shared extension
+// Export for '_pickle' shared extension
 PyAPI_FUNC(int) _PySet_NextEntry(
     PyObject *set,
     Py_ssize_t *pos,
     PyObject **key,
     Py_hash_t *hash);
 
-// Export for 'pickle' shared extension
+// Export for '_pickle' shared extension
 PyAPI_FUNC(int) _PySet_Update(PyObject *set, PyObject *iterable);
 
-// Export _PySet_Dummy for the gdb plugin's benefit
+// Export for the gdb plugin's (python-gdb.py) benefit
 PyAPI_DATA(PyObject *) _PySet_Dummy;
 
 #ifdef __cplusplus

Include/internal/pycore_sysmodule.h

@@ -14,8 +14,8 @@ extern int _PySys_Audit(
     const char *argFormat,
     ...);
 
-/* We want minimal exposure of this function, so use extern rather than
-   PyAPI_FUNC() to not export the symbol. */
+// _PySys_ClearAuditHooks() must not be exported: use extern rather than
+// PyAPI_FUNC(). We want minimal exposure of this function.
 extern void _PySys_ClearAuditHooks(PyThreadState *tstate);
 
 extern int _PySys_SetAttr(PyObject *, PyObject *);

Include/internal/pycore_token.h

@@ -94,7 +94,7 @@ extern "C" {
                                  (x) == FSTRING_MIDDLE)
 
 
-// Symbols exported for test_peg_generator
+// Export these 4 symbols for 'test_peg_generator'
 PyAPI_DATA(const char * const) _PyParser_TokenNames[]; /* Token names */
 PyAPI_FUNC(int) _PyToken_OneChar(int);
 PyAPI_FUNC(int) _PyToken_TwoChars(int, int);

Include/internal/pycore_typeobject.h

@@ -114,8 +114,10 @@ extern static_builtin_state * _PyStaticType_GetState(PyInterpreterState *, PyTyp
 extern void _PyStaticType_ClearWeakRefs(PyInterpreterState *, PyTypeObject *type);
 extern void _PyStaticType_Dealloc(PyInterpreterState *, PyTypeObject *);
 
-// Export for 'math' shared extension via _PyType_IsReady() function
+// Export for 'math' shared extension, used via _PyType_IsReady() static inline
+// function
 PyAPI_FUNC(PyObject *) _PyType_GetDict(PyTypeObject *);
+
 extern PyObject * _PyType_GetBases(PyTypeObject *type);
 extern PyObject * _PyType_GetMRO(PyTypeObject *type);
 extern PyObject* _PyType_GetSubclasses(PyTypeObject *);

Include/internal/pycore_unicodeobject.h

@@ -24,17 +24,18 @@ extern int _PyUnicode_IsCased(Py_UCS4 ch);
 
 /* --- Unicode API -------------------------------------------------------- */
 
+// Export for '_json' shared extension
 PyAPI_FUNC(int) _PyUnicode_CheckConsistency(
     PyObject *op,
     int check_content);
 
 extern void _PyUnicode_ExactDealloc(PyObject *op);
 extern Py_ssize_t _PyUnicode_InternedSize(void);
 
-/* Get a copy of a Unicode string. */
+// Get a copy of a Unicode string.
+// Export for '_datetime' shared extension.
 PyAPI_FUNC(PyObject*) _PyUnicode_Copy(
-    PyObject *unicode
-    );
+    PyObject *unicode);
 
 /* Unsafe version of PyUnicode_Fill(): don't check arguments and so may crash
    if parameters are invalid (e.g. if length is longer than the string). */
@@ -93,11 +94,13 @@ typedef struct {
     unsigned char readonly;
 } _PyUnicodeWriter ;
 
-/* Initialize a Unicode writer.
- *
- * By default, the minimum buffer size is 0 character and overallocation is
- * disabled. Set min_length, min_char and overallocate attributes to control
- * the allocation of the buffer. */
+// Initialize a Unicode writer.
+//
+// By default, the minimum buffer size is 0 character and overallocation is
+// disabled. Set min_length, min_char and overallocate attributes to control
+// the allocation of the buffer.
+//
+// Export the _PyUnicodeWriter API for '_multibytecodec' shared extension.
 PyAPI_FUNC(void)
 _PyUnicodeWriter_Init(_PyUnicodeWriter *writer);
 
@@ -204,13 +207,14 @@ extern PyObject* _PyUnicode_EncodeUTF7(
 
 /* --- UTF-8 Codecs ------------------------------------------------------- */
 
+// Export for '_tkinter' shared extension.
 PyAPI_FUNC(PyObject*) _PyUnicode_AsUTF8String(
     PyObject *unicode,
     const char *errors);
 
 /* --- UTF-32 Codecs ------------------------------------------------------ */
 
-PyAPI_FUNC(PyObject*) _PyUnicode_EncodeUTF32(
+extern PyObject* _PyUnicode_EncodeUTF32(
     PyObject *object,           /* Unicode object */
     const char *errors,         /* error handling */
     int byteorder);             /* byteorder to use 0=BOM+native;-1=LE,1=BE */
@@ -231,7 +235,7 @@ PyAPI_FUNC(PyObject*) _PyUnicode_EncodeUTF32(
    Unicode BOM mark (U+FEFF). In the other two modes, no BOM mark is
    prepended.
 */
-PyAPI_FUNC(PyObject*) _PyUnicode_EncodeUTF16(
+extern PyObject* _PyUnicode_EncodeUTF16(
     PyObject* unicode,          /* Unicode object */
     const char *errors,         /* error handling */
     int byteorder);             /* byteorder to use 0=BOM+native;-1=LE,1=BE */
@@ -297,13 +301,14 @@ extern PyObject* _PyUnicode_EncodeCharmap(
 
 /* --- Decimal Encoder ---------------------------------------------------- */
 
-/* Coverts a Unicode object holding a decimal value to an ASCII string
-   for using in int, float and complex parsers.
-   Transforms code points that have decimal digit property to the
-   corresponding ASCII digit code points.  Transforms spaces to ASCII.
-   Transforms code points starting from the first non-ASCII code point that
-   is neither a decimal digit nor a space to the end into '?'. */
-
+// Coverts a Unicode object holding a decimal value to an ASCII string
+// for using in int, float and complex parsers.
+// Transforms code points that have decimal digit property to the
+// corresponding ASCII digit code points.  Transforms spaces to ASCII.
+// Transforms code points starting from the first non-ASCII code point that
+// is neither a decimal digit nor a space to the end into '?'.
+//
+// Export for '_testinternalcapi' shared extension.
 PyAPI_FUNC(PyObject*) _PyUnicode_TransformDecimalAndSpaceToASCII(
     PyObject *unicode);         /* Unicode object */
 
@@ -323,9 +328,10 @@ extern int _PyUnicode_EqualToASCIIId(
     _Py_Identifier *right       /* Right identifier */
     );
 
-/* Test whether a unicode is equal to ASCII string.  Return 1 if true,
-   0 otherwise.  The right argument must be ASCII-encoded string.
-   Any error occurs inside will be cleared before return. */
+// Test whether a unicode is equal to ASCII string.  Return 1 if true,
+// 0 otherwise.  The right argument must be ASCII-encoded string.
+// Any error occurs inside will be cleared before return.
+// Export for '_ctypes' shared extension
 PyAPI_FUNC(int) _PyUnicode_EqualToASCIIString(
     PyObject *left,
     const char *right           /* ASCII-encoded string */
@@ -357,14 +363,17 @@ extern Py_ssize_t _PyUnicode_InsertThousandsGrouping(
 
 extern PyObject* _PyUnicode_FormatLong(PyObject *, int, int, int);
 
-/* Return an interned Unicode object for an Identifier; may fail if there is no memory.*/
+// Return an interned Unicode object for an Identifier; may fail if there is no
+// memory.
+// Export for '_testembed' program.
 PyAPI_FUNC(PyObject*) _PyUnicode_FromId(_Py_Identifier*);
 
 /* Fast equality check when the inputs are known to be exact unicode types
    and where the hash values are equal (i.e. a very probable match) */
 extern int _PyUnicode_EQ(PyObject *, PyObject *);
 
-/* Equality check. */
+// Equality check.
+// Export for '_pickle' shared extension.
 PyAPI_FUNC(int) _PyUnicode_Equal(PyObject *, PyObject *);
 
 extern int _PyUnicode_WideCharString_Converter(PyObject *, void *);

Modules/_testinternalcapi.c

@@ -14,9 +14,9 @@
 #include "pycore_bitutils.h"      // _Py_bswap32()
 #include "pycore_bytesobject.h"   // _PyBytes_Find()
 #include "pycore_compile.h"       // _PyCompile_CodeGen, _PyCompile_OptimizeCfg, _PyCompile_Assemble, _PyCompile_CleanDoc
-#include "pycore_ceval.h"         // _PyEval_AddPendingCall
+#include "pycore_ceval.h"         // _PyEval_AddPendingCall()
 #include "pycore_dict.h"          // _PyDictOrValues_GetValues()
-#include "pycore_fileutils.h"     // _Py_normpath
+#include "pycore_fileutils.h"     // _Py_normpath()
 #include "pycore_frame.h"         // _PyInterpreterFrame
 #include "pycore_gc.h"            // PyGC_Head
 #include "pycore_hashtable.h"     // _Py_hashtable_new()