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