Issue #19512: add some common identifiers to only create common strings once,

instead of creating temporary Unicode string objects

Add also more identifiers in pythonrun.c to avoid temporary Unicode string
objets for the interactive interpreter.

Include/object.h

@@ -143,9 +143,17 @@ typedef struct _Py_Identifier {
     PyObject *object;
 } _Py_Identifier;
 
-#define _Py_static_string(varname, value)  static _Py_Identifier varname = { 0, value, 0 }
+#define _Py_static_string_init(value) { 0, value, 0 }
+#define _Py_static_string(varname, value)  static _Py_Identifier varname = _Py_static_string_init(value)
 #define _Py_IDENTIFIER(varname) _Py_static_string(PyId_##varname, #varname)
 
+/* Common identifiers */
+PyAPI_DATA(_Py_Identifier) _PyId_path;
+PyAPI_DATA(_Py_Identifier) _PyId_argv;
+PyAPI_DATA(_Py_Identifier) _PyId_stdin;
+PyAPI_DATA(_Py_Identifier) _PyId_stdout;
+PyAPI_DATA(_Py_Identifier) _PyId_stderr;
+
 /*
 Type objects contain a string containing the type name (to help somewhat
 in debugging), the allocation parameters (see PyObject_New() and
@@ -829,7 +837,7 @@ PyAPI_FUNC(void) _Py_Dealloc(PyObject *);
         PyObject *_py_xincref_tmp = (PyObject *)(op); \
         if (_py_xincref_tmp != NULL)                  \
             Py_INCREF(_py_xincref_tmp);               \
-    } while (0)                                    
+    } while (0)
 
 #define Py_XDECREF(op)                                \
     do {                                              \

Modules/_ctypes/callbacks.c

@@ -80,7 +80,7 @@ static void
 PrintError(char *msg, ...)
 {
     char buf[512];
-    PyObject *f = PySys_GetObject("stderr");
+    PyObject *f = _PySys_GetObjectId(&_PyId_stderr);
     va_list marker;
 
     va_start(marker, msg);

Modules/_cursesmodule.c

@@ -2578,7 +2578,7 @@ PyCurses_setupterm(PyObject* self, PyObject *args, PyObject* keywds)
     if (fd == -1) {
         PyObject* sys_stdout;
 
-        sys_stdout = PySys_GetObject("stdout");
+        sys_stdout = _PySys_GetObjectId(&_PyId_stdout);
 
         if (sys_stdout == NULL || sys_stdout == Py_None) {
             PyErr_SetString(

Modules/_threadmodule.c

@@ -1005,7 +1005,7 @@ t_bootstrap(void *boot_raw)
             PySys_WriteStderr(
                 "Unhandled exception in thread started by ");
             PyErr_Fetch(&exc, &value, &tb);
-            file = PySys_GetObject("stderr");
+            file = _PySys_GetObjectId(&_PyId_stderr);
             if (file != NULL && file != Py_None)
                 PyFile_WriteObject(boot->func, file, 0);
             else

Modules/faulthandler.c

@@ -136,7 +136,7 @@ faulthandler_get_fileno(PyObject *file, int *p_fd)
     int fd;
 
     if (file == NULL || file == Py_None) {
-        file = PySys_GetObject("stderr");
+        file = _PySys_GetObjectId(&_PyId_stderr);
         if (file == NULL) {
             PyErr_SetString(PyExc_RuntimeError, "unable to get sys.stderr");
             return NULL;

Modules/main.c

@@ -261,7 +261,7 @@ RunMainFromImporter(wchar_t *filename)
 
     /* argv0 is usable as an import source, so put it in sys.path[0]
        and import __main__ */
-    sys_path = PySys_GetObject("path");
+    sys_path = _PySys_GetObjectId(&_PyId_path);
     if (sys_path == NULL) {
         PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path");
         goto error;

Modules/syslogmodule.c

@@ -71,7 +71,7 @@ syslog_get_argv(void)
     Py_ssize_t argv_len, scriptlen;
     PyObject *scriptobj;
     Py_ssize_t slash;
-    PyObject *argv = PySys_GetObject("argv");
+    PyObject *argv = _PySys_GetObjectId(&_PyId_argv);
 
     if (argv == NULL) {
         return(NULL);

Python/_warnings.c

@@ -265,7 +265,7 @@ show_warning(PyObject *filename, int lineno, PyObject *text, PyObject
     if (name == NULL)  /* XXX Can an object lack a '__name__' attribute? */
         goto error;
 
-    f_stderr = PySys_GetObject("stderr");
+    f_stderr = _PySys_GetObjectId(&_PyId_stderr);
     if (f_stderr == NULL) {
         fprintf(stderr, "lost sys.stderr\n");
         goto error;
@@ -562,7 +562,7 @@ setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,
     else {
         *filename = NULL;
         if (*module != Py_None && PyUnicode_CompareWithASCIIString(*module, "__main__") == 0) {
-            PyObject *argv = PySys_GetObject("argv");
+            PyObject *argv = _PySys_GetObjectId(&_PyId_argv);
             /* PyList_Check() is needed because sys.argv is set to None during
                Python finalization */
             if (argv != NULL && PyList_Check(argv) && PyList_Size(argv) > 0) {

Python/bltinmodule.c

@@ -1553,7 +1553,7 @@ builtin_print(PyObject *self, PyObject *args, PyObject *kwds)
                                      kwlist, &sep, &end, &file, &flush))
         return NULL;
     if (file == NULL || file == Py_None) {
-        file = PySys_GetObject("stdout");
+        file = _PySys_GetObjectId(&_PyId_stdout);
         if (file == NULL) {
             PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
             return NULL;
@@ -1638,9 +1638,9 @@ static PyObject *
 builtin_input(PyObject *self, PyObject *args)
 {
     PyObject *promptarg = NULL;
-    PyObject *fin = PySys_GetObject("stdin");
-    PyObject *fout = PySys_GetObject("stdout");
-    PyObject *ferr = PySys_GetObject("stderr");
+    PyObject *fin = _PySys_GetObjectId(&_PyId_stdin);
+    PyObject *fout = _PySys_GetObjectId(&_PyId_stdout);
+    PyObject *ferr = _PySys_GetObjectId(&_PyId_stderr);
     PyObject *tmp;
     long fd;
     int tty;

Python/errors.c

@@ -844,7 +844,7 @@ PyErr_WriteUnraisable(PyObject *obj)
 
     PyErr_Fetch(&t, &v, &tb);
 
-    f = PySys_GetObject("stderr");
+    f = _PySys_GetObjectId(&_PyId_stderr);
     if (f == NULL || f == Py_None)
         goto done;
 

Python/pythonrun.c

@@ -35,6 +35,21 @@
 #define PATH_MAX MAXPATHLEN
 #endif
 
+/* Common identifiers */
+_Py_Identifier _PyId_argv = _Py_static_string_init("argv");
+_Py_Identifier _PyId_path = _Py_static_string_init("path");
+_Py_Identifier _PyId_stdin = _Py_static_string_init("stdin");
+_Py_Identifier _PyId_stdout = _Py_static_string_init("stdout");
+_Py_Identifier _PyId_stderr = _Py_static_string_init("stderr");
+
+/* local identifiers */
+_Py_IDENTIFIER(excepthook);
+_Py_IDENTIFIER(ps1);
+_Py_IDENTIFIER(ps2);
+_Py_IDENTIFIER(last_type);
+_Py_IDENTIFIER(last_value);
+_Py_IDENTIFIER(last_traceback);
+
 #ifdef Py_REF_DEBUG
 static
 void _print_total_refs(void) {
@@ -412,7 +427,7 @@ _Py_InitializeEx_Private(int install_sigs, int install_importlib)
     pstderr = PyFile_NewStdPrinter(fileno(stderr));
     if (pstderr == NULL)
         Py_FatalError("Py_Initialize: can't set preliminary stderr");
-    PySys_SetObject("stderr", pstderr);
+    _PySys_SetObjectId(&_PyId_stderr, pstderr);
     PySys_SetObject("__stderr__", pstderr);
     Py_DECREF(pstderr);
 
@@ -497,8 +512,8 @@ file_is_closed(PyObject *fobj)
 static void
 flush_std_files(void)
 {
-    PyObject *fout = PySys_GetObject("stdout");
-    PyObject *ferr = PySys_GetObject("stderr");
+    PyObject *fout = _PySys_GetObjectId(&_PyId_stdout);
+    PyObject *ferr = _PySys_GetObjectId(&_PyId_stderr);
     PyObject *tmp;
     _Py_IDENTIFIER(flush);
 
@@ -776,7 +791,7 @@ Py_NewInterpreter(void)
         pstderr = PyFile_NewStdPrinter(fileno(stderr));
         if (pstderr == NULL)
             Py_FatalError("Py_Initialize: can't set preliminary stderr");
-        PySys_SetObject("stderr", pstderr);
+        _PySys_SetObjectId(&_PyId_stderr, pstderr);
         PySys_SetObject("__stderr__", pstderr);
         Py_DECREF(pstderr);
 
@@ -1170,7 +1185,7 @@ initstdio(void)
             goto error;
     } /* if (fd < 0) */
     PySys_SetObject("__stdin__", std);
-    PySys_SetObject("stdin", std);
+    _PySys_SetObjectId(&_PyId_stdin, std);
     Py_DECREF(std);
 
     /* Set sys.stdout */
@@ -1185,7 +1200,7 @@ initstdio(void)
             goto error;
     } /* if (fd < 0) */
     PySys_SetObject("__stdout__", std);
-    PySys_SetObject("stdout", std);
+    _PySys_SetObjectId(&_PyId_stdout, std);
     Py_DECREF(std);
 
 #if 1 /* Disable this if you have trouble debugging bootstrap stuff */
@@ -1219,7 +1234,7 @@ initstdio(void)
         Py_DECREF(std);
         goto error;
     }
-    if (PySys_SetObject("stderr", std) < 0) {
+    if (_PySys_SetObjectId(&_PyId_stderr, std) < 0) {
         Py_DECREF(std);
         goto error;
     }
@@ -1281,14 +1296,14 @@ PyRun_InteractiveLoopFlags(FILE *fp, const char *filename_str, PyCompilerFlags *
         flags = &local_flags;
         local_flags.cf_flags = 0;
     }
-    v = PySys_GetObject("ps1");
+    v = _PySys_GetObjectId(&PyId_ps1);
     if (v == NULL) {
-        PySys_SetObject("ps1", v = PyUnicode_FromString(">>> "));
+        _PySys_SetObjectId(&PyId_ps1, v = PyUnicode_FromString(">>> "));
         Py_XDECREF(v);
     }
-    v = PySys_GetObject("ps2");
+    v = _PySys_GetObjectId(&PyId_ps2);
     if (v == NULL) {
-        PySys_SetObject("ps2", v = PyUnicode_FromString("... "));
+        _PySys_SetObjectId(&PyId_ps2, v = PyUnicode_FromString("... "));
         Py_XDECREF(v);
     }
     err = -1;
@@ -1351,7 +1366,7 @@ PyRun_InteractiveOneObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)
 
     if (fp == stdin) {
         /* Fetch encoding from sys.stdin if possible. */
-        v = PySys_GetObject("stdin");
+        v = _PySys_GetObjectId(&_PyId_stdin);
         if (v && v != Py_None) {
             oenc = _PyObject_GetAttrId(v, &PyId_encoding);
             if (oenc)
@@ -1360,7 +1375,7 @@ PyRun_InteractiveOneObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)
                 PyErr_Clear();
         }
     }
-    v = PySys_GetObject("ps1");
+    v = _PySys_GetObjectId(&PyId_ps1);
     if (v != NULL) {
         v = PyObject_Str(v);
         if (v == NULL)
@@ -1373,7 +1388,7 @@ PyRun_InteractiveOneObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)
             }
         }
     }
-    w = PySys_GetObject("ps2");
+    w = _PySys_GetObjectId(&PyId_ps2);
     if (w != NULL) {
         w = PyObject_Str(w);
         if (w == NULL)
@@ -1752,7 +1767,7 @@ handle_system_exit(void)
     if (PyLong_Check(value))
         exitcode = (int)PyLong_AsLong(value);
     else {
-        PyObject *sys_stderr = PySys_GetObject("stderr");
+        PyObject *sys_stderr = _PySys_GetObjectId(&_PyId_stderr);
         if (sys_stderr != NULL && sys_stderr != Py_None) {
             PyFile_WriteObject(value, sys_stderr, Py_PRINT_RAW);
         } else {
@@ -1795,11 +1810,11 @@ PyErr_PrintEx(int set_sys_last_vars)
         return;
     /* Now we know v != NULL too */
     if (set_sys_last_vars) {
-        PySys_SetObject("last_type", exception);
-        PySys_SetObject("last_value", v);
-        PySys_SetObject("last_traceback", tb);
+        _PySys_SetObjectId(&PyId_last_type, exception);
+        _PySys_SetObjectId(&PyId_last_value, v);
+        _PySys_SetObjectId(&PyId_last_traceback, tb);
     }
-    hook = PySys_GetObject("excepthook");
+    hook = _PySys_GetObjectId(&PyId_excepthook);
     if (hook) {
         PyObject *args = PyTuple_Pack(3, exception, v, tb);
         PyObject *result = PyEval_CallObject(hook, args);
@@ -2009,7 +2024,7 @@ void
 PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
 {
     PyObject *seen;
-    PyObject *f = PySys_GetObject("stderr");
+    PyObject *f = _PySys_GetObjectId(&_PyId_stderr);
     if (PyExceptionInstance_Check(value)
         && tb != NULL && PyTraceBack_Check(tb)) {
         /* Put the traceback on the exception, otherwise it won't get
@@ -2107,7 +2122,7 @@ flush_io(void)
     /* Save the current exception */
     PyErr_Fetch(&type, &value, &traceback);
 
-    f = PySys_GetObject("stderr");
+    f = _PySys_GetObjectId(&_PyId_stderr);
     if (f != NULL) {
         r = _PyObject_CallMethodId(f, &PyId_flush, "");
         if (r)
@@ -2115,7 +2130,7 @@ flush_io(void)
         else
             PyErr_Clear();
     }
-    f = PySys_GetObject("stdout");
+    f = _PySys_GetObjectId(&_PyId_stdout);
     if (f != NULL) {
         r = _PyObject_CallMethodId(f, &PyId_flush, "");
         if (r)

Python/sysmodule.c

@@ -183,7 +183,7 @@ sys_displayhook(PyObject *self, PyObject *o)
     }
     if (_PyObject_SetAttrId(builtins, &PyId__, Py_None) != 0)
         return NULL;
-    outf = PySys_GetObject("stdout");
+    outf = _PySys_GetObjectId(&_PyId_stdout);
     if (outf == NULL || outf == Py_None) {
         PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
         return NULL;
@@ -1825,7 +1825,7 @@ PySys_SetPath(const wchar_t *path)
     PyObject *v;
     if ((v = makepathobject(path, DELIM)) == NULL)
         Py_FatalError("can't create sys.path");
-    if (PySys_SetObject("path", v) != 0)
+    if (_PySys_SetObjectId(&_PyId_path, v) != 0)
         Py_FatalError("can't assign sys.path");
     Py_DECREF(v);
 }
@@ -1894,7 +1894,7 @@ sys_update_path(int argc, wchar_t **argv)
     wchar_t fullpath[MAX_PATH];
 #endif
 
-    path = PySys_GetObject("path");
+    path = _PySys_GetObjectId(&_PyId_path);
     if (path == NULL)
         return;
 
@@ -2081,7 +2081,7 @@ sys_pyfile_write(const char *text, PyObject *file)
  */
 
 static void
-sys_write(char *name, FILE *fp, const char *format, va_list va)
+sys_write(_Py_Identifier *key, FILE *fp, const char *format, va_list va)
 {
     PyObject *file;
     PyObject *error_type, *error_value, *error_traceback;
@@ -2089,7 +2089,7 @@ sys_write(char *name, FILE *fp, const char *format, va_list va)
     int written;
 
     PyErr_Fetch(&error_type, &error_value, &error_traceback);
-    file = PySys_GetObject(name);
+    file = _PySys_GetObjectId(key);
     written = PyOS_vsnprintf(buffer, sizeof(buffer), format, va);
     if (sys_pyfile_write(buffer, file) != 0) {
         PyErr_Clear();
@@ -2109,7 +2109,7 @@ PySys_WriteStdout(const char *format, ...)
     va_list va;
 
     va_start(va, format);
-    sys_write("stdout", stdout, format, va);
+    sys_write(&_PyId_stdout, stdout, format, va);
     va_end(va);
 }
 
@@ -2119,19 +2119,19 @@ PySys_WriteStderr(const char *format, ...)
     va_list va;
 
     va_start(va, format);
-    sys_write("stderr", stderr, format, va);
+    sys_write(&_PyId_stderr, stderr, format, va);
     va_end(va);
 }
 
 static void
-sys_format(char *name, FILE *fp, const char *format, va_list va)
+sys_format(_Py_Identifier *key, FILE *fp, const char *format, va_list va)
 {
     PyObject *file, *message;
     PyObject *error_type, *error_value, *error_traceback;
     char *utf8;
 
     PyErr_Fetch(&error_type, &error_value, &error_traceback);
-    file = PySys_GetObject(name);
+    file = _PySys_GetObjectId(key);
     message = PyUnicode_FromFormatV(format, va);
     if (message != NULL) {
         if (sys_pyfile_write_unicode(message, file) != 0) {
@@ -2151,7 +2151,7 @@ PySys_FormatStdout(const char *format, ...)
     va_list va;
 
     va_start(va, format);
-    sys_format("stdout", stdout, format, va);
+    sys_format(&_PyId_stdout, stdout, format, va);
     va_end(va);
 }
 
@@ -2161,6 +2161,6 @@ PySys_FormatStderr(const char *format, ...)
     va_list va;
 
     va_start(va, format);
-    sys_format("stderr", stderr, format, va);
+    sys_format(&_PyId_stderr, stderr, format, va);
     va_end(va);
 }

Python/traceback.c

@@ -169,7 +169,7 @@ _Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *
         tail++;
     taillen = strlen(tail);
 
-    syspath = PySys_GetObject("path");
+    syspath = _PySys_GetObjectId(&_PyId_path);
     if (syspath == NULL || !PyList_Check(syspath))
         goto error;
     npath = PyList_Size(syspath);