Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 2 | /* Frame object implementation */ |
| 3 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 4 | #include "Python.h" |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 5 | |
| 6 | #include "compile.h" |
| 7 | #include "frameobject.h" |
| 8 | #include "opcode.h" |
| 9 | #include "structmember.h" |
| 10 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 11 | #define OFF(x) offsetof(PyFrameObject, x) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 12 | |
| 13 | static struct memberlist frame_memberlist[] = { |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 14 | {"f_back", T_OBJECT, OFF(f_back), RO}, |
| 15 | {"f_code", T_OBJECT, OFF(f_code), RO}, |
Guido van Rossum | c113482 | 1995-01-10 10:39:16 +0000 | [diff] [blame] | 16 | {"f_builtins", T_OBJECT, OFF(f_builtins),RO}, |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 17 | {"f_globals", T_OBJECT, OFF(f_globals), RO}, |
| 18 | {"f_locals", T_OBJECT, OFF(f_locals), RO}, |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 19 | {"f_lasti", T_INT, OFF(f_lasti), RO}, |
| 20 | {"f_lineno", T_INT, OFF(f_lineno), RO}, |
Guido van Rossum | c113482 | 1995-01-10 10:39:16 +0000 | [diff] [blame] | 21 | {"f_restricted",T_INT, OFF(f_restricted),RO}, |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 22 | {"f_trace", T_OBJECT, OFF(f_trace)}, |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 23 | {"f_exc_type", T_OBJECT, OFF(f_exc_type)}, |
| 24 | {"f_exc_value", T_OBJECT, OFF(f_exc_value)}, |
| 25 | {"f_exc_traceback", T_OBJECT, OFF(f_exc_traceback)}, |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 26 | {NULL} /* Sentinel */ |
| 27 | }; |
| 28 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 29 | static PyObject * |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 30 | frame_getattr(PyFrameObject *f, char *name) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 31 | { |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 32 | if (strcmp(name, "f_locals") == 0) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 33 | PyFrame_FastToLocals(f); |
| 34 | return PyMember_Get((char *)f, frame_memberlist, name); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 35 | } |
| 36 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 37 | static int |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 38 | frame_setattr(PyFrameObject *f, char *name, PyObject *value) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 39 | { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 40 | return PyMember_Set((char *)f, frame_memberlist, name, value); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 41 | } |
| 42 | |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 43 | /* Stack frames are allocated and deallocated at a considerable rate. |
| 44 | In an attempt to improve the speed of function calls, we maintain a |
| 45 | separate free list of stack frames (just like integers are |
| 46 | allocated in a special way -- see intobject.c). When a stack frame |
| 47 | is on the free list, only the following members have a meaning: |
| 48 | ob_type == &Frametype |
| 49 | f_back next item on free list, or NULL |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 50 | f_nlocals number of locals |
| 51 | f_stacksize size of value stack |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 52 | f_size size of localsplus |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 53 | Note that the value and block stacks are preserved -- this can save |
| 54 | another malloc() call or two (and two free() calls as well!). |
| 55 | Also note that, unlike for integers, each frame object is a |
| 56 | malloc'ed object in its own right -- it is only the actual calls to |
| 57 | malloc() that we are trying to save here, not the administration. |
| 58 | After all, while a typical program may make millions of calls, a |
| 59 | call depth of more than 20 or 30 is probably already exceptional |
| 60 | unless the program contains run-away recursion. I hope. |
| 61 | */ |
| 62 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 63 | static PyFrameObject *free_list = NULL; |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 64 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 65 | static void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 66 | frame_dealloc(PyFrameObject *f) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 67 | { |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 68 | int i, slots; |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 69 | PyObject **fastlocals; |
Tim Peters | 5ca576e | 2001-06-18 22:08:13 +0000 | [diff] [blame] | 70 | PyObject **p; |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 71 | |
Guido van Rossum | d724b23 | 2000-03-13 16:01:29 +0000 | [diff] [blame] | 72 | Py_TRASHCAN_SAFE_BEGIN(f) |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 73 | /* Kill all local variables */ |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 74 | slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 75 | fastlocals = f->f_localsplus; |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 76 | for (i = slots; --i >= 0; ++fastlocals) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 77 | Py_XDECREF(*fastlocals); |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 78 | } |
| 79 | |
Tim Peters | 5ca576e | 2001-06-18 22:08:13 +0000 | [diff] [blame] | 80 | /* Free stack */ |
Tim Peters | 8c96369 | 2001-06-23 05:26:56 +0000 | [diff] [blame^] | 81 | if (f->f_stacktop != NULL) { |
| 82 | for (p = f->f_valuestack; p < f->f_stacktop; p++) |
| 83 | Py_XDECREF(*p); |
Tim Peters | 5ca576e | 2001-06-18 22:08:13 +0000 | [diff] [blame] | 84 | } |
Tim Peters | 8c96369 | 2001-06-23 05:26:56 +0000 | [diff] [blame^] | 85 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 86 | Py_XDECREF(f->f_back); |
| 87 | Py_XDECREF(f->f_code); |
| 88 | Py_XDECREF(f->f_builtins); |
| 89 | Py_XDECREF(f->f_globals); |
| 90 | Py_XDECREF(f->f_locals); |
| 91 | Py_XDECREF(f->f_trace); |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 92 | Py_XDECREF(f->f_exc_type); |
| 93 | Py_XDECREF(f->f_exc_value); |
| 94 | Py_XDECREF(f->f_exc_traceback); |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 95 | f->f_back = free_list; |
| 96 | free_list = f; |
Guido van Rossum | d724b23 | 2000-03-13 16:01:29 +0000 | [diff] [blame] | 97 | Py_TRASHCAN_SAFE_END(f) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 98 | } |
| 99 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 100 | PyTypeObject PyFrame_Type = { |
| 101 | PyObject_HEAD_INIT(&PyType_Type) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 102 | 0, |
| 103 | "frame", |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 104 | sizeof(PyFrameObject), |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 105 | 0, |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 106 | (destructor)frame_dealloc, /*tp_dealloc*/ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 107 | 0, /*tp_print*/ |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 108 | (getattrfunc)frame_getattr, /*tp_getattr*/ |
| 109 | (setattrfunc)frame_setattr, /*tp_setattr*/ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 110 | 0, /*tp_compare*/ |
| 111 | 0, /*tp_repr*/ |
| 112 | 0, /*tp_as_number*/ |
| 113 | 0, /*tp_as_sequence*/ |
| 114 | 0, /*tp_as_mapping*/ |
| 115 | }; |
| 116 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 117 | PyFrameObject * |
Jeremy Hylton | 64949cb | 2001-01-25 20:06:59 +0000 | [diff] [blame] | 118 | PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals, |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 119 | PyObject *locals) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 120 | { |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 121 | PyFrameObject *back = tstate->frame; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 122 | static PyObject *builtin_object; |
| 123 | PyFrameObject *f; |
| 124 | PyObject *builtins; |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 125 | int extras, ncells, nfrees; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 126 | |
Sjoerd Mullender | 5b7f3cd | 1995-04-04 11:47:41 +0000 | [diff] [blame] | 127 | if (builtin_object == NULL) { |
Guido van Rossum | b56933e | 1997-01-18 07:58:41 +0000 | [diff] [blame] | 128 | builtin_object = PyString_InternFromString("__builtins__"); |
Sjoerd Mullender | 5b7f3cd | 1995-04-04 11:47:41 +0000 | [diff] [blame] | 129 | if (builtin_object == NULL) |
| 130 | return NULL; |
| 131 | } |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 132 | if ((back != NULL && !PyFrame_Check(back)) || |
| 133 | code == NULL || !PyCode_Check(code) || |
| 134 | globals == NULL || !PyDict_Check(globals) || |
| 135 | (locals != NULL && !PyDict_Check(locals))) { |
| 136 | PyErr_BadInternalCall(); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 137 | return NULL; |
| 138 | } |
Jeremy Hylton | 64949cb | 2001-01-25 20:06:59 +0000 | [diff] [blame] | 139 | ncells = PyTuple_GET_SIZE(code->co_cellvars); |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 140 | nfrees = PyTuple_GET_SIZE(code->co_freevars); |
| 141 | extras = code->co_stacksize + code->co_nlocals + ncells + nfrees; |
Guido van Rossum | bde6ff7 | 1998-02-19 20:48:26 +0000 | [diff] [blame] | 142 | if (back == NULL || back->f_globals != globals) { |
| 143 | builtins = PyDict_GetItem(globals, builtin_object); |
| 144 | if (builtins != NULL && PyModule_Check(builtins)) |
| 145 | builtins = PyModule_GetDict(builtins); |
| 146 | } |
| 147 | else { |
| 148 | /* If we share the globals, we share the builtins. |
| 149 | Save a lookup and a call. */ |
| 150 | builtins = back->f_builtins; |
| 151 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 152 | if (builtins != NULL && !PyDict_Check(builtins)) |
| 153 | builtins = NULL; |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 154 | if (free_list == NULL) { |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 155 | /* PyObject_New is inlined */ |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 156 | f = (PyFrameObject *) |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 157 | PyObject_MALLOC(sizeof(PyFrameObject) + |
| 158 | extras*sizeof(PyObject *)); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 159 | if (f == NULL) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 160 | return (PyFrameObject *)PyErr_NoMemory(); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 161 | PyObject_INIT(f, &PyFrame_Type); |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 162 | f->f_size = extras; |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 163 | } |
| 164 | else { |
| 165 | f = free_list; |
| 166 | free_list = free_list->f_back; |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 167 | if (f->f_size < extras) { |
Guido van Rossum | 6345ac6 | 1997-10-31 20:32:13 +0000 | [diff] [blame] | 168 | f = (PyFrameObject *) |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 169 | PyObject_REALLOC(f, sizeof(PyFrameObject) + |
| 170 | extras*sizeof(PyObject *)); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 171 | if (f == NULL) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 172 | return (PyFrameObject *)PyErr_NoMemory(); |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 173 | f->f_size = extras; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 174 | } |
Guido van Rossum | 747596a | 1997-01-24 04:00:21 +0000 | [diff] [blame] | 175 | else |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 176 | extras = f->f_size; |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 177 | PyObject_INIT(f, &PyFrame_Type); |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 178 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 179 | if (builtins == NULL) { |
Guido van Rossum | bde6ff7 | 1998-02-19 20:48:26 +0000 | [diff] [blame] | 180 | /* No builtins! Make up a minimal one. */ |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 181 | builtins = PyDict_New(); |
Guido van Rossum | f61618c | 1998-10-19 14:20:20 +0000 | [diff] [blame] | 182 | if (builtins == NULL || /* Give them 'None', at least. */ |
| 183 | PyDict_SetItemString(builtins, "None", Py_None) < 0) { |
| 184 | Py_DECREF(f); |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 185 | return NULL; |
Guido van Rossum | f61618c | 1998-10-19 14:20:20 +0000 | [diff] [blame] | 186 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 187 | } |
| 188 | else |
| 189 | Py_XINCREF(builtins); |
| 190 | f->f_builtins = builtins; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 191 | Py_XINCREF(back); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 192 | f->f_back = back; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 193 | Py_INCREF(code); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 194 | f->f_code = code; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 195 | Py_INCREF(globals); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 196 | f->f_globals = globals; |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 197 | if (code->co_flags & CO_NEWLOCALS) { |
| 198 | if (code->co_flags & CO_OPTIMIZED) |
| 199 | locals = NULL; /* Let fast_2_locals handle it */ |
| 200 | else { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 201 | locals = PyDict_New(); |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 202 | if (locals == NULL) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 203 | Py_DECREF(f); |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 204 | return NULL; |
| 205 | } |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 206 | } |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 207 | } |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 208 | else { |
| 209 | if (locals == NULL) |
| 210 | locals = globals; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 211 | Py_INCREF(locals); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 212 | } |
| 213 | f->f_locals = locals; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 214 | f->f_trace = NULL; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 215 | f->f_exc_type = f->f_exc_value = f->f_exc_traceback = NULL; |
Guido van Rossum | eb46d67 | 1997-08-02 02:59:08 +0000 | [diff] [blame] | 216 | f->f_tstate = tstate; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 217 | |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 218 | f->f_lasti = 0; |
Guido van Rossum | 747596a | 1997-01-24 04:00:21 +0000 | [diff] [blame] | 219 | f->f_lineno = code->co_firstlineno; |
Guido van Rossum | eb46d67 | 1997-08-02 02:59:08 +0000 | [diff] [blame] | 220 | f->f_restricted = (builtins != tstate->interp->builtins); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 221 | f->f_iblock = 0; |
| 222 | f->f_nlocals = code->co_nlocals; |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 223 | f->f_stacksize = code->co_stacksize; |
| 224 | f->f_ncells = ncells; |
| 225 | f->f_nfreevars = nfrees; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 226 | |
| 227 | while (--extras >= 0) |
| 228 | f->f_localsplus[extras] = NULL; |
| 229 | |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 230 | f->f_valuestack = f->f_localsplus + (f->f_nlocals + ncells + nfrees); |
Tim Peters | 8c96369 | 2001-06-23 05:26:56 +0000 | [diff] [blame^] | 231 | f->f_stacktop = f->f_valuestack; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 232 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 233 | return f; |
| 234 | } |
| 235 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 236 | /* Block management */ |
| 237 | |
| 238 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 239 | PyFrame_BlockSetup(PyFrameObject *f, int type, int handler, int level) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 240 | { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 241 | PyTryBlock *b; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 242 | if (f->f_iblock >= CO_MAXBLOCKS) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 243 | Py_FatalError("XXX block stack overflow"); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 244 | b = &f->f_blockstack[f->f_iblock++]; |
| 245 | b->b_type = type; |
| 246 | b->b_level = level; |
| 247 | b->b_handler = handler; |
| 248 | } |
| 249 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 250 | PyTryBlock * |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 251 | PyFrame_BlockPop(PyFrameObject *f) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 252 | { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 253 | PyTryBlock *b; |
Guido van Rossum | d7047b3 | 1995-01-02 19:07:15 +0000 | [diff] [blame] | 254 | if (f->f_iblock <= 0) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 255 | Py_FatalError("XXX block stack underflow"); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 256 | b = &f->f_blockstack[--f->f_iblock]; |
| 257 | return b; |
| 258 | } |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 259 | |
| 260 | /* Convert between "fast" version of locals and dictionary version */ |
| 261 | |
Guido van Rossum | f68d8e5 | 2001-04-14 17:55:09 +0000 | [diff] [blame] | 262 | static void |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 263 | map_to_dict(PyObject *map, int nmap, PyObject *dict, PyObject **values, |
| 264 | int deref) |
| 265 | { |
| 266 | int j; |
| 267 | for (j = nmap; --j >= 0; ) { |
| 268 | PyObject *key = PyTuple_GetItem(map, j); |
| 269 | PyObject *value = values[j]; |
| 270 | if (deref) |
| 271 | value = PyCell_GET(value); |
| 272 | if (value == NULL) { |
| 273 | PyErr_Clear(); |
| 274 | if (PyDict_DelItem(dict, key) != 0) |
| 275 | PyErr_Clear(); |
| 276 | } |
| 277 | else { |
| 278 | if (PyDict_SetItem(dict, key, value) != 0) |
| 279 | PyErr_Clear(); |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | |
Guido van Rossum | 6b356e7 | 2001-04-14 17:55:41 +0000 | [diff] [blame] | 284 | static void |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 285 | dict_to_map(PyObject *map, int nmap, PyObject *dict, PyObject **values, |
| 286 | int deref, int clear) |
| 287 | { |
| 288 | int j; |
| 289 | for (j = nmap; --j >= 0; ) { |
| 290 | PyObject *key = PyTuple_GetItem(map, j); |
| 291 | PyObject *value = PyDict_GetItem(dict, key); |
| 292 | Py_XINCREF(value); |
| 293 | if (deref) { |
Jeremy Hylton | 4c88901 | 2001-05-08 04:08:59 +0000 | [diff] [blame] | 294 | if (value || clear) { |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 295 | if (PyCell_Set(values[j], value) < 0) |
| 296 | PyErr_Clear(); |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 297 | } |
| 298 | } else if (value != NULL || clear) { |
| 299 | Py_XDECREF(values[j]); |
| 300 | values[j] = value; |
| 301 | } |
| 302 | } |
| 303 | } |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 304 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 305 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 306 | PyFrame_FastToLocals(PyFrameObject *f) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 307 | { |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 308 | /* Merge fast locals into f->f_locals */ |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 309 | PyObject *locals, *map; |
| 310 | PyObject **fast; |
| 311 | PyObject *error_type, *error_value, *error_traceback; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 312 | int j; |
| 313 | if (f == NULL) |
| 314 | return; |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 315 | locals = f->f_locals; |
| 316 | if (locals == NULL) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 317 | locals = f->f_locals = PyDict_New(); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 318 | if (locals == NULL) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 319 | PyErr_Clear(); /* Can't report it :-( */ |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 320 | return; |
| 321 | } |
| 322 | } |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 323 | if (f->f_nlocals == 0) |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 324 | return; |
| 325 | map = f->f_code->co_varnames; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 326 | if (!PyDict_Check(locals) || !PyTuple_Check(map)) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 327 | return; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 328 | PyErr_Fetch(&error_type, &error_value, &error_traceback); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 329 | fast = f->f_localsplus; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 330 | j = PyTuple_Size(map); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 331 | if (j > f->f_nlocals) |
| 332 | j = f->f_nlocals; |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 333 | map_to_dict(map, j, locals, fast, 0); |
| 334 | if (f->f_ncells || f->f_nfreevars) { |
| 335 | if (!(PyTuple_Check(f->f_code->co_cellvars) |
| 336 | && PyTuple_Check(f->f_code->co_freevars))) { |
| 337 | Py_DECREF(locals); |
| 338 | return; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 339 | } |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 340 | map_to_dict(f->f_code->co_cellvars, |
| 341 | PyTuple_GET_SIZE(f->f_code->co_cellvars), |
| 342 | locals, fast + f->f_nlocals, 1); |
| 343 | map_to_dict(f->f_code->co_freevars, |
| 344 | PyTuple_GET_SIZE(f->f_code->co_freevars), |
| 345 | locals, fast + f->f_nlocals + f->f_ncells, 1); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 346 | } |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 347 | PyErr_Restore(error_type, error_value, error_traceback); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 351 | PyFrame_LocalsToFast(PyFrameObject *f, int clear) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 352 | { |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 353 | /* Merge f->f_locals into fast locals */ |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 354 | PyObject *locals, *map; |
| 355 | PyObject **fast; |
| 356 | PyObject *error_type, *error_value, *error_traceback; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 357 | int j; |
| 358 | if (f == NULL) |
| 359 | return; |
| 360 | locals = f->f_locals; |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 361 | map = f->f_code->co_varnames; |
Guido van Rossum | 3bb63a8 | 1997-01-20 04:29:16 +0000 | [diff] [blame] | 362 | if (locals == NULL || f->f_code->co_nlocals == 0) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 363 | return; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 364 | if (!PyDict_Check(locals) || !PyTuple_Check(map)) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 365 | return; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 366 | PyErr_Fetch(&error_type, &error_value, &error_traceback); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 367 | fast = f->f_localsplus; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 368 | j = PyTuple_Size(map); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 369 | if (j > f->f_nlocals) |
| 370 | j = f->f_nlocals; |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 371 | dict_to_map(f->f_code->co_varnames, j, locals, fast, 0, clear); |
| 372 | if (f->f_ncells || f->f_nfreevars) { |
| 373 | if (!(PyTuple_Check(f->f_code->co_cellvars) |
| 374 | && PyTuple_Check(f->f_code->co_freevars))) |
| 375 | return; |
| 376 | dict_to_map(f->f_code->co_cellvars, |
| 377 | PyTuple_GET_SIZE(f->f_code->co_cellvars), |
Jeremy Hylton | 4c88901 | 2001-05-08 04:08:59 +0000 | [diff] [blame] | 378 | locals, fast + f->f_nlocals, 1, clear); |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 379 | dict_to_map(f->f_code->co_freevars, |
| 380 | PyTuple_GET_SIZE(f->f_code->co_freevars), |
Jeremy Hylton | 4c88901 | 2001-05-08 04:08:59 +0000 | [diff] [blame] | 381 | locals, fast + f->f_nlocals + f->f_ncells, 1, clear); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 382 | } |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 383 | PyErr_Restore(error_type, error_value, error_traceback); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 384 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 385 | |
| 386 | /* Clear out the free list */ |
| 387 | |
| 388 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 389 | PyFrame_Fini(void) |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 390 | { |
| 391 | while (free_list != NULL) { |
| 392 | PyFrameObject *f = free_list; |
| 393 | free_list = free_list->f_back; |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 394 | PyObject_DEL(f); |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 395 | } |
| 396 | } |