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gh-103571: Add runtime-global strings to the initial per-interpreter interned_dict #103572

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gh-103571: Add runtime-global strings to the initial per-interpreter interned_dict #103572

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gh-103571: Add runtime-global strings to the initial per-interpreter …
Christopher-Chianelli Apr 16, 2023
7d06a7e
Modify singleton object interning to not use intern dict
Christopher-Chianelli Apr 16, 2023
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37 changes: 35 additions & 2 deletions Objects/codeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,11 @@
#include "pycore_tuple.h" // _PyTuple_ITEMS()
#include "clinic/codeobject.c.h"

#define LATIN1(ch) \
(ch < 128 \
? (PyObject*)&_Py_SINGLETON(strings).ascii[ch] \
: (PyObject*)&_Py_SINGLETON(strings).latin1[ch - 128])

static PyObject* code_repr(PyCodeObject *co);

static const char *
Expand Down Expand Up @@ -111,6 +116,15 @@ PyCode_ClearWatcher(int watcher_id)
* generic helpers
******************/

/* is_runtime_global_string(s): true iff s is a runtime global (singleton ascii strings) */
static int
is_runtime_global_string(PyObject *o) {
if (!PyUnicode_IS_ASCII(o))
return 0;

return PyUnicode_GET_LENGTH(o) == 1;
}

/* all_name_chars(s): true iff s matches [a-zA-Z0-9_]* */
static int
all_name_chars(PyObject *o)
Expand Down Expand Up @@ -156,8 +170,27 @@ intern_string_constants(PyObject *tuple, int *modified)
if (PyUnicode_READY(v) == -1) {
return -1;
}

if (all_name_chars(v)) {
if (is_runtime_global_string(v)) {
// unfortunately, storing the immortal singletons
// in the interned string dict seem to cause some
// refcount issues
const void *data;
int kind;
Py_UCS4 ch;

kind = PyUnicode_KIND(v);
data = PyUnicode_DATA(v);
ch = PyUnicode_READ(kind, data, 0);
PyObject *w = LATIN1(ch);
if (w != v) {
PyTuple_SET_ITEM(tuple, i, w);
Py_INCREF(w);
if (modified) {
*modified = 1;
}
}
}
else if (all_name_chars(v)) {
PyObject *w = v;
PyUnicode_InternInPlace(&v);
if (w != v) {
Expand Down