diff options
Diffstat (limited to 'Python/ceval.c')
| -rw-r--r-- | Python/ceval.c | 154 |
1 files changed, 142 insertions, 12 deletions
diff --git a/Python/ceval.c b/Python/ceval.c index 8547f85..0f52a0b 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -87,6 +87,62 @@ static long dxp[256]; #endif #endif +/* Function call profile */ +#ifdef CALL_PROFILE +#define PCALL_NUM 11 +static int pcall[PCALL_NUM]; + +#define PCALL_ALL 0 +#define PCALL_FUNCTION 1 +#define PCALL_FAST_FUNCTION 2 +#define PCALL_FASTER_FUNCTION 3 +#define PCALL_METHOD 4 +#define PCALL_BOUND_METHOD 5 +#define PCALL_CFUNCTION 6 +#define PCALL_TYPE 7 +#define PCALL_GENERATOR 8 +#define PCALL_OTHER 9 +#define PCALL_POP 10 + +/* Notes about the statistics + + PCALL_FAST stats + + FAST_FUNCTION means no argument tuple needs to be created. + FASTER_FUNCTION means that the fast-path frame setup code is used. + + If there is a method call where the call can be optimized by changing + the argument tuple and calling the function directly, it gets recorded + twice. + + As a result, the relationship among the statistics appears to be + PCALL_ALL == PCALL_FUNCTION + PCALL_METHOD - PCALL_BOUND_METHOD + + PCALL_CFUNCTION + PCALL_TYPE + PCALL_GENERATOR + PCALL_OTHER + PCALL_FUNCTION > PCALL_FAST_FUNCTION > PCALL_FASTER_FUNCTION + PCALL_METHOD > PCALL_BOUND_METHOD +*/ + +#define PCALL(POS) pcall[POS]++ + +PyObject * +PyEval_GetCallStats(PyObject *self) +{ + return Py_BuildValue("iiiiiiiiii", + pcall[0], pcall[1], pcall[2], pcall[3], + pcall[4], pcall[5], pcall[6], pcall[7], + pcall[8], pcall[9]); +} +#else +#define PCALL(O) + +PyObject * +PyEval_GetCallStats(PyObject *self) +{ + Py_INCREF(Py_None); + return Py_None; +} +#endif + static PyTypeObject gentype; typedef struct { @@ -475,6 +531,7 @@ volatile int _Py_Ticker = 100; PyObject * PyEval_EvalCode(PyCodeObject *co, PyObject *globals, PyObject *locals) { + /* XXX raise SystemError if globals is NULL */ return PyEval_EvalCodeEx(co, globals, locals, (PyObject **)NULL, 0, @@ -1980,6 +2037,7 @@ eval_frame(PyFrameObject *f) continue; case CALL_FUNCTION: + PCALL(PCALL_ALL); x = call_function(&stack_pointer, oparg); PUSH(x); if (x != NULL) @@ -1995,6 +2053,7 @@ eval_frame(PyFrameObject *f) int flags = (opcode - CALL_FUNCTION) & 3; int n = na + 2 * nk; PyObject **pfunc, *func; + PCALL(PCALL_ALL); if (flags & CALL_FLAG_VAR) n++; if (flags & CALL_FLAG_KW) @@ -2317,9 +2376,8 @@ PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals, return NULL; } - f = PyFrame_New(tstate, /*back*/ - co, /*code*/ - globals, locals); + assert(globals != NULL); + f = PyFrame_New(tstate, co, globals, locals); if (f == NULL) return NULL; @@ -2520,6 +2578,8 @@ PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals, Py_XDECREF(f->f_back); f->f_back = NULL; + PCALL(PCALL_GENERATOR); + /* Create a new generator that owns the ready to run frame * and return that as the value. */ return gen_new(f); @@ -3198,12 +3258,12 @@ call_function(PyObject ***pp_stack, int oparg) PyObject *func = *pfunc; PyObject *x, *w; - /* Always dispatch PyCFunction first, because - these are presumed to be the most frequent - callable object. + /* Always dispatch PyCFunction first, because these are + presumed to be the most frequent callable object. */ if (PyCFunction_Check(func) && nk == 0) { int flags = PyCFunction_GET_FLAGS(func); + PCALL(PCALL_CFUNCTION); if (flags & (METH_NOARGS | METH_O)) { PyCFunction meth = PyCFunction_GET_FUNCTION(func); PyObject *self = PyCFunction_GET_SELF(func); @@ -3229,6 +3289,8 @@ call_function(PyObject ***pp_stack, int oparg) if (PyMethod_Check(func) && PyMethod_GET_SELF(func) != NULL) { /* optimize access to bound methods */ PyObject *self = PyMethod_GET_SELF(func); + PCALL(PCALL_METHOD); + PCALL(PCALL_BOUND_METHOD); Py_INCREF(self); func = PyMethod_GET_FUNCTION(func); Py_INCREF(func); @@ -3245,35 +3307,75 @@ call_function(PyObject ***pp_stack, int oparg) Py_DECREF(func); } + /* What does this do? */ while ((*pp_stack) > pfunc) { w = EXT_POP(*pp_stack); Py_DECREF(w); + PCALL(PCALL_POP); } return x; } /* The fast_function() function optimize calls for which no argument tuple is necessary; the objects are passed directly from the stack. + For the simplest case -- a function that takes only positional + arguments and is called with only positional arguments -- it + inlines the most primitive frame setup code from + PyEval_EvalCodeEx(), which vastly reduces the checks that must be + done before evaluating the frame. */ static PyObject * fast_function(PyObject *func, PyObject ***pp_stack, int n, int na, int nk) { - PyObject *co = PyFunction_GET_CODE(func); + PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func); PyObject *globals = PyFunction_GET_GLOBALS(func); PyObject *argdefs = PyFunction_GET_DEFAULTS(func); - PyObject *closure = PyFunction_GET_CLOSURE(func); PyObject **d = NULL; int nd = 0; + PCALL(PCALL_FUNCTION); + PCALL(PCALL_FAST_FUNCTION); + if (argdefs == NULL && co->co_argcount == n && + co->co_flags == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE)) { + PyFrameObject *f; + PyObject *retval = NULL; + PyThreadState *tstate = PyThreadState_GET(); + PyObject **fastlocals, **stack; + int i; + + PCALL(PCALL_FASTER_FUNCTION); + assert(globals != NULL); + /* XXX Perhaps we should create a specialized + PyFrame_New() that doesn't take locals, but does + take builtins without sanity checking them. + */ + f = PyFrame_New(tstate, co, globals, NULL); + if (f == NULL) + return NULL; + + fastlocals = f->f_localsplus; + stack = (*pp_stack) - n; + + for (i = 0; i < n; i++) { + Py_INCREF(*stack); + fastlocals[i] = *stack++; + } + retval = eval_frame(f); + assert(tstate != NULL); + ++tstate->recursion_depth; + Py_DECREF(f); + --tstate->recursion_depth; + return retval; + } if (argdefs != NULL) { d = &PyTuple_GET_ITEM(argdefs, 0); nd = ((PyTupleObject *)argdefs)->ob_size; } - return PyEval_EvalCodeEx((PyCodeObject *)co, globals, - (PyObject *)NULL, (*pp_stack)-n, na, - (*pp_stack)-2*nk, nk, d, nd, - closure); + return PyEval_EvalCodeEx(co, globals, + (PyObject *)NULL, (*pp_stack)-n, na, + (*pp_stack)-2*nk, nk, d, nd, + PyFunction_GET_CLOSURE(func)); } static PyObject * @@ -3371,6 +3473,20 @@ do_call(PyObject *func, PyObject ***pp_stack, int na, int nk) callargs = load_args(pp_stack, na); if (callargs == NULL) goto call_fail; +#ifdef CALL_PROFILE + /* At this point, we have to look at the type of func to + update the call stats properly. Do it here so as to avoid + exposing the call stats machinery outside ceval.c + */ + if (PyFunction_Check(func)) + PCALL(PCALL_FUNCTION); + else if (PyMethod_Check(func)) + PCALL(PCALL_METHOD); + else if (PyType_Check(func)) + PCALL(PCALL_TYPE); + else + PCALL(PCALL_OTHER); +#endif result = PyObject_Call(func, callargs, kwdict); call_fail: Py_XDECREF(callargs); @@ -3426,6 +3542,20 @@ ext_do_call(PyObject *func, PyObject ***pp_stack, int flags, int na, int nk) callargs = update_star_args(na, nstar, stararg, pp_stack); if (callargs == NULL) goto ext_call_fail; +#ifdef CALL_PROFILE + /* At this point, we have to look at the type of func to + update the call stats properly. Do it here so as to avoid + exposing the call stats machinery outside ceval.c + */ + if (PyFunction_Check(func)) + PCALL(PCALL_FUNCTION); + else if (PyMethod_Check(func)) + PCALL(PCALL_METHOD); + else if (PyType_Check(func)) + PCALL(PCALL_TYPE); + else + PCALL(PCALL_OTHER); +#endif result = PyObject_Call(func, callargs, kwdict); ext_call_fail: Py_XDECREF(callargs); |