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call_trace(): Add an additional parameter -- pointer to a PyObject*

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that should be used to cache an interned version of the event
    string passed to the profile/trace function.  call_trace() will
    create interned strings and cache them in using the storage
    specified by this additional parameter, avoiding a lot of string
    object creation at runtime when using the profiling or tracing
    functions.

All call sites are modified to pass the additional parameter, and four
static PyObject* variables are allocated to cache the interned string
objects.

This closes SF patch #431257.
This commit is contained in:
Fred Drake 2001-06-08 04:33:09 +00:00
parent edb5ffb2c1
commit 904aa7bb00
1 changed files with 36 additions and 13 deletions
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43
Python/ceval.c
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@ -62,7 +62,7 @@ static int prtrace(PyObject *, char *);
#endif
static void call_exc_trace(PyObject **, PyObject**, PyFrameObject *);
static int call_trace(PyObject **, PyObject **,
PyFrameObject *, char *, PyObject *);
PyFrameObject *, char *, PyObject **, PyObject *);
static PyObject *loop_subscript(PyObject *, PyObject *);
static PyObject *apply_slice(PyObject *, PyObject *, PyObject *);
static int assign_slice(PyObject *, PyObject *,
@ -97,6 +97,15 @@ static long dxp[256];
#endif
#endif
/* Cached interned string objects used for calling the profile and
* trace functions.
*/
static PyObject *str_call = NULL;
static PyObject *str_exception = NULL;
static PyObject *str_line = NULL;
static PyObject *str_return = NULL;
#ifdef WITH_THREAD
#ifndef DONT_HAVE_ERRNO_H
@ -645,7 +654,7 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
(sys.trace) is also called whenever an exception
is detected. */
if (call_trace(&tstate->sys_tracefunc,
&f->f_trace, f, "call",
&f->f_trace, f, "call", &str_call,
Py_None/*XXX how to compute arguments now?*/)) {
/* Trace function raised an error */
goto fail;
@ -656,7 +665,7 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
/* Similar for sys_profilefunc, except it needn't return
itself and isn't called for "line" events */
if (call_trace(&tstate->sys_profilefunc,
(PyObject**)0, f, "call",
(PyObject**)0, f, "call", &str_call,
Py_None/*XXX*/)) {
goto fail;
}
@ -1952,7 +1961,7 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
/* Trace each line of code reached */
f->f_lasti = INSTR_OFFSET();
err = call_trace(&f->f_trace, &f->f_trace,
f, "line", Py_None);
f, "line", &str_line, Py_None);
break;
case CALL_FUNCTION:
@ -2297,7 +2306,7 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
if (f->f_trace) {
if (why == WHY_RETURN) {
if (call_trace(&f->f_trace, &f->f_trace, f,
"return", retval)) {
"return", &str_return, retval)) {
Py_XDECREF(retval);
retval = NULL;
why = WHY_EXCEPTION;
@ -2307,7 +2316,7 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
if (tstate->sys_profilefunc && why == WHY_RETURN) {
if (call_trace(&tstate->sys_profilefunc, (PyObject**)0,
f, "return", retval)) {
f, "return", &str_return, retval)) {
Py_XDECREF(retval);
retval = NULL;
why = WHY_EXCEPTION;
@ -2575,7 +2584,8 @@ call_exc_trace(PyObject **p_trace, PyObject **p_newtrace, PyFrameObject *f)
PyErr_Restore(type, value, traceback);
return;
}
err = call_trace(p_trace, p_newtrace, f, "exception", arg);
err = call_trace(p_trace, p_newtrace, f,
"exception", &str_exception, arg);
Py_DECREF(arg);
if (err == 0)
PyErr_Restore(type, value, traceback);
@ -2590,11 +2600,16 @@ call_exc_trace(PyObject **p_trace, PyObject **p_newtrace, PyFrameObject *f)
may not point to NULL variable initially
PyObject **p_newtrace: in/out; may be NULL;
may point to NULL variable;
may be same variable as p_newtrace */
may be same variable as p_newtrace
PyObject **p_omsg: in/out; may not be NULL;
if non-null & *p_omsg == NULL, will be
initialized with an interned string
corresponding to msg.
*/
static int
call_trace(PyObject **p_trace, PyObject **p_newtrace, PyFrameObject *f,
char *msg, PyObject *arg)
char *msg, PyObject **p_omsg, PyObject *arg)
{
PyThreadState *tstate = f->f_tstate;
PyObject *args, *what;
@ -2612,9 +2627,17 @@ call_trace(PyObject **p_trace, PyObject **p_newtrace, PyFrameObject *f,
args = PyTuple_New(3);
if (args == NULL)
goto cleanup;
what = PyString_FromString(msg);
if (*p_omsg != NULL) {
what = *p_omsg;
Py_INCREF(what);
}
else {
what = PyString_InternFromString(msg);
if (what == NULL)
goto cleanup;
*p_omsg = what;
Py_INCREF(what);
}
Py_INCREF(f);
PyTuple_SET_ITEM(args, 0, (PyObject *)f);
PyTuple_SET_ITEM(args, 1, what);