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 | |
Guido van Rossum | 6f79937 | 2001-09-20 20:46:19 +0000 | [diff] [blame] | 13 | static PyMemberDef 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}, |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 18 | {"f_lasti", T_INT, OFF(f_lasti), RO}, |
| 19 | {"f_lineno", T_INT, OFF(f_lineno), RO}, |
Guido van Rossum | c113482 | 1995-01-10 10:39:16 +0000 | [diff] [blame] | 20 | {"f_restricted",T_INT, OFF(f_restricted),RO}, |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 21 | {"f_trace", T_OBJECT, OFF(f_trace)}, |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 22 | {"f_exc_type", T_OBJECT, OFF(f_exc_type)}, |
| 23 | {"f_exc_value", T_OBJECT, OFF(f_exc_value)}, |
| 24 | {"f_exc_traceback", T_OBJECT, OFF(f_exc_traceback)}, |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 25 | {NULL} /* Sentinel */ |
| 26 | }; |
| 27 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 28 | static PyObject * |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 29 | frame_getlocals(PyFrameObject *f, void *closure) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 30 | { |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 31 | PyFrame_FastToLocals(f); |
| 32 | Py_INCREF(f->f_locals); |
| 33 | return f->f_locals; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 34 | } |
| 35 | |
Guido van Rossum | 32d34c8 | 2001-09-20 21:45:26 +0000 | [diff] [blame] | 36 | static PyGetSetDef frame_getsetlist[] = { |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 37 | {"f_locals", (getter)frame_getlocals, NULL, NULL}, |
| 38 | {0} |
| 39 | }; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 40 | |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 41 | /* Stack frames are allocated and deallocated at a considerable rate. |
| 42 | In an attempt to improve the speed of function calls, we maintain a |
| 43 | separate free list of stack frames (just like integers are |
| 44 | allocated in a special way -- see intobject.c). When a stack frame |
| 45 | is on the free list, only the following members have a meaning: |
| 46 | ob_type == &Frametype |
| 47 | f_back next item on free list, or NULL |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 48 | f_nlocals number of locals |
| 49 | f_stacksize size of value stack |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 50 | ob_size size of localsplus |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 51 | Note that the value and block stacks are preserved -- this can save |
| 52 | another malloc() call or two (and two free() calls as well!). |
| 53 | Also note that, unlike for integers, each frame object is a |
| 54 | malloc'ed object in its own right -- it is only the actual calls to |
| 55 | malloc() that we are trying to save here, not the administration. |
| 56 | After all, while a typical program may make millions of calls, a |
| 57 | call depth of more than 20 or 30 is probably already exceptional |
| 58 | unless the program contains run-away recursion. I hope. |
Tim Peters | b7ba743 | 2002-04-13 05:21:47 +0000 | [diff] [blame] | 59 | |
| 60 | Later, MAXFREELIST was added to bound the # of frames saved on |
| 61 | free_list. Else programs creating lots of cyclic trash involving |
| 62 | frames could provoke free_list into growing without bound. |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 63 | */ |
| 64 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 65 | static PyFrameObject *free_list = NULL; |
Tim Peters | b7ba743 | 2002-04-13 05:21:47 +0000 | [diff] [blame] | 66 | static int numfree = 0; /* number of frames currently in free_list */ |
| 67 | #define MAXFREELIST 200 /* max value for numfree */ |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 68 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 69 | static void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 70 | frame_dealloc(PyFrameObject *f) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 71 | { |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 72 | int i, slots; |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 73 | PyObject **fastlocals; |
Tim Peters | 5ca576e | 2001-06-18 22:08:13 +0000 | [diff] [blame] | 74 | PyObject **p; |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 75 | |
Guido van Rossum | ff413af | 2002-03-28 20:34:59 +0000 | [diff] [blame] | 76 | PyObject_GC_UnTrack(f); |
Guido van Rossum | d724b23 | 2000-03-13 16:01:29 +0000 | [diff] [blame] | 77 | Py_TRASHCAN_SAFE_BEGIN(f) |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 78 | /* Kill all local variables */ |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 79 | slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 80 | fastlocals = f->f_localsplus; |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 81 | for (i = slots; --i >= 0; ++fastlocals) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 82 | Py_XDECREF(*fastlocals); |
Guido van Rossum | 7582bfb | 1997-02-14 16:27:29 +0000 | [diff] [blame] | 83 | } |
| 84 | |
Tim Peters | 5ca576e | 2001-06-18 22:08:13 +0000 | [diff] [blame] | 85 | /* Free stack */ |
Tim Peters | 8c96369 | 2001-06-23 05:26:56 +0000 | [diff] [blame] | 86 | if (f->f_stacktop != NULL) { |
| 87 | for (p = f->f_valuestack; p < f->f_stacktop; p++) |
| 88 | Py_XDECREF(*p); |
Tim Peters | 5ca576e | 2001-06-18 22:08:13 +0000 | [diff] [blame] | 89 | } |
Tim Peters | 8c96369 | 2001-06-23 05:26:56 +0000 | [diff] [blame] | 90 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 91 | Py_XDECREF(f->f_back); |
| 92 | Py_XDECREF(f->f_code); |
| 93 | Py_XDECREF(f->f_builtins); |
| 94 | Py_XDECREF(f->f_globals); |
| 95 | Py_XDECREF(f->f_locals); |
| 96 | Py_XDECREF(f->f_trace); |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 97 | Py_XDECREF(f->f_exc_type); |
| 98 | Py_XDECREF(f->f_exc_value); |
| 99 | Py_XDECREF(f->f_exc_traceback); |
Tim Peters | b7ba743 | 2002-04-13 05:21:47 +0000 | [diff] [blame] | 100 | if (numfree < MAXFREELIST) { |
| 101 | ++numfree; |
| 102 | f->f_back = free_list; |
| 103 | free_list = f; |
| 104 | } |
| 105 | else |
| 106 | PyObject_GC_Del(f); |
Guido van Rossum | d724b23 | 2000-03-13 16:01:29 +0000 | [diff] [blame] | 107 | Py_TRASHCAN_SAFE_END(f) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 108 | } |
| 109 | |
Neil Schemenauer | 19cd292 | 2001-07-12 13:27:11 +0000 | [diff] [blame] | 110 | static int |
| 111 | frame_traverse(PyFrameObject *f, visitproc visit, void *arg) |
| 112 | { |
| 113 | PyObject **fastlocals, **p; |
| 114 | int i, err, slots; |
| 115 | #define VISIT(o) if (o) {if ((err = visit((PyObject *)(o), arg))) return err;} |
| 116 | |
| 117 | VISIT(f->f_back); |
| 118 | VISIT(f->f_code); |
| 119 | VISIT(f->f_builtins); |
| 120 | VISIT(f->f_globals); |
| 121 | VISIT(f->f_locals); |
| 122 | VISIT(f->f_trace); |
| 123 | VISIT(f->f_exc_type); |
| 124 | VISIT(f->f_exc_value); |
| 125 | VISIT(f->f_exc_traceback); |
| 126 | |
| 127 | /* locals */ |
| 128 | slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
| 129 | fastlocals = f->f_localsplus; |
| 130 | for (i = slots; --i >= 0; ++fastlocals) { |
| 131 | VISIT(*fastlocals); |
| 132 | } |
| 133 | |
| 134 | /* stack */ |
| 135 | if (f->f_stacktop != NULL) { |
| 136 | for (p = f->f_valuestack; p < f->f_stacktop; p++) |
| 137 | VISIT(*p); |
| 138 | } |
Neil Schemenauer | 19cd292 | 2001-07-12 13:27:11 +0000 | [diff] [blame] | 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static void |
| 143 | frame_clear(PyFrameObject *f) |
| 144 | { |
| 145 | PyObject **fastlocals, **p; |
| 146 | int i, slots; |
| 147 | |
| 148 | Py_XDECREF(f->f_exc_type); |
| 149 | f->f_exc_type = NULL; |
| 150 | |
| 151 | Py_XDECREF(f->f_exc_value); |
| 152 | f->f_exc_value = NULL; |
| 153 | |
| 154 | Py_XDECREF(f->f_exc_traceback); |
| 155 | f->f_exc_traceback = NULL; |
| 156 | |
| 157 | Py_XDECREF(f->f_trace); |
| 158 | f->f_trace = NULL; |
| 159 | |
| 160 | /* locals */ |
| 161 | slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
| 162 | fastlocals = f->f_localsplus; |
| 163 | for (i = slots; --i >= 0; ++fastlocals) { |
| 164 | if (*fastlocals != NULL) { |
| 165 | Py_XDECREF(*fastlocals); |
| 166 | *fastlocals = NULL; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | /* stack */ |
| 171 | if (f->f_stacktop != NULL) { |
| 172 | for (p = f->f_valuestack; p < f->f_stacktop; p++) { |
| 173 | Py_XDECREF(*p); |
| 174 | *p = NULL; |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 180 | PyTypeObject PyFrame_Type = { |
| 181 | PyObject_HEAD_INIT(&PyType_Type) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 182 | 0, |
| 183 | "frame", |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 184 | sizeof(PyFrameObject), |
| 185 | sizeof(PyObject *), |
Neil Schemenauer | 19cd292 | 2001-07-12 13:27:11 +0000 | [diff] [blame] | 186 | (destructor)frame_dealloc, /* tp_dealloc */ |
| 187 | 0, /* tp_print */ |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 188 | 0, /* tp_getattr */ |
| 189 | 0, /* tp_setattr */ |
Neil Schemenauer | 19cd292 | 2001-07-12 13:27:11 +0000 | [diff] [blame] | 190 | 0, /* tp_compare */ |
| 191 | 0, /* tp_repr */ |
| 192 | 0, /* tp_as_number */ |
| 193 | 0, /* tp_as_sequence */ |
| 194 | 0, /* tp_as_mapping */ |
| 195 | 0, /* tp_hash */ |
| 196 | 0, /* tp_call */ |
| 197 | 0, /* tp_str */ |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 198 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 199 | PyObject_GenericSetAttr, /* tp_setattro */ |
Neil Schemenauer | 19cd292 | 2001-07-12 13:27:11 +0000 | [diff] [blame] | 200 | 0, /* tp_as_buffer */ |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 201 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */ |
Neil Schemenauer | 19cd292 | 2001-07-12 13:27:11 +0000 | [diff] [blame] | 202 | 0, /* tp_doc */ |
| 203 | (traverseproc)frame_traverse, /* tp_traverse */ |
| 204 | (inquiry)frame_clear, /* tp_clear */ |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 205 | 0, /* tp_richcompare */ |
| 206 | 0, /* tp_weaklistoffset */ |
| 207 | 0, /* tp_iter */ |
| 208 | 0, /* tp_iternext */ |
| 209 | 0, /* tp_methods */ |
| 210 | frame_memberlist, /* tp_members */ |
| 211 | frame_getsetlist, /* tp_getset */ |
| 212 | 0, /* tp_base */ |
| 213 | 0, /* tp_dict */ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 214 | }; |
| 215 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 216 | PyFrameObject * |
Jeremy Hylton | 64949cb | 2001-01-25 20:06:59 +0000 | [diff] [blame] | 217 | PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals, |
Jeremy Hylton | 30c9f39 | 2001-03-13 01:58:22 +0000 | [diff] [blame] | 218 | PyObject *locals) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 219 | { |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 220 | PyFrameObject *back = tstate->frame; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 221 | static PyObject *builtin_object; |
| 222 | PyFrameObject *f; |
| 223 | PyObject *builtins; |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 224 | int extras, ncells, nfrees; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 225 | |
Sjoerd Mullender | 5b7f3cd | 1995-04-04 11:47:41 +0000 | [diff] [blame] | 226 | if (builtin_object == NULL) { |
Guido van Rossum | b56933e | 1997-01-18 07:58:41 +0000 | [diff] [blame] | 227 | builtin_object = PyString_InternFromString("__builtins__"); |
Sjoerd Mullender | 5b7f3cd | 1995-04-04 11:47:41 +0000 | [diff] [blame] | 228 | if (builtin_object == NULL) |
| 229 | return NULL; |
| 230 | } |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 231 | if ((back != NULL && !PyFrame_Check(back)) || |
| 232 | code == NULL || !PyCode_Check(code) || |
| 233 | globals == NULL || !PyDict_Check(globals) || |
| 234 | (locals != NULL && !PyDict_Check(locals))) { |
| 235 | PyErr_BadInternalCall(); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 236 | return NULL; |
| 237 | } |
Jeremy Hylton | 64949cb | 2001-01-25 20:06:59 +0000 | [diff] [blame] | 238 | ncells = PyTuple_GET_SIZE(code->co_cellvars); |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 239 | nfrees = PyTuple_GET_SIZE(code->co_freevars); |
| 240 | extras = code->co_stacksize + code->co_nlocals + ncells + nfrees; |
Guido van Rossum | bde6ff7 | 1998-02-19 20:48:26 +0000 | [diff] [blame] | 241 | if (back == NULL || back->f_globals != globals) { |
| 242 | builtins = PyDict_GetItem(globals, builtin_object); |
| 243 | if (builtins != NULL && PyModule_Check(builtins)) |
| 244 | builtins = PyModule_GetDict(builtins); |
| 245 | } |
| 246 | else { |
| 247 | /* If we share the globals, we share the builtins. |
| 248 | Save a lookup and a call. */ |
| 249 | builtins = back->f_builtins; |
| 250 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 251 | if (builtins != NULL && !PyDict_Check(builtins)) |
| 252 | builtins = NULL; |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 253 | if (free_list == NULL) { |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 254 | f = PyObject_GC_NewVar(PyFrameObject, &PyFrame_Type, extras); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 255 | if (f == NULL) |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 256 | return NULL; |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 257 | } |
| 258 | else { |
Tim Peters | b7ba743 | 2002-04-13 05:21:47 +0000 | [diff] [blame] | 259 | assert(numfree > 0); |
| 260 | --numfree; |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 261 | f = free_list; |
| 262 | free_list = free_list->f_back; |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 263 | if (f->ob_size < extras) { |
| 264 | f = PyObject_GC_Resize(PyFrameObject, f, extras); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 265 | if (f == NULL) |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 266 | return NULL; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 267 | } |
Guido van Rossum | 747596a | 1997-01-24 04:00:21 +0000 | [diff] [blame] | 268 | else |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 269 | extras = f->ob_size; |
Tim Peters | deb77e8 | 2001-08-30 00:32:51 +0000 | [diff] [blame] | 270 | _Py_NewReference((PyObject *)f); |
Guido van Rossum | a9e7dc1 | 1992-10-18 18:53:57 +0000 | [diff] [blame] | 271 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 272 | if (builtins == NULL) { |
Guido van Rossum | bde6ff7 | 1998-02-19 20:48:26 +0000 | [diff] [blame] | 273 | /* No builtins! Make up a minimal one. */ |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 274 | builtins = PyDict_New(); |
Guido van Rossum | f61618c | 1998-10-19 14:20:20 +0000 | [diff] [blame] | 275 | if (builtins == NULL || /* Give them 'None', at least. */ |
| 276 | PyDict_SetItemString(builtins, "None", Py_None) < 0) { |
| 277 | Py_DECREF(f); |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 278 | return NULL; |
Guido van Rossum | f61618c | 1998-10-19 14:20:20 +0000 | [diff] [blame] | 279 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 280 | } |
| 281 | else |
| 282 | Py_XINCREF(builtins); |
| 283 | f->f_builtins = builtins; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 284 | Py_XINCREF(back); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 285 | f->f_back = back; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 286 | Py_INCREF(code); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 287 | f->f_code = code; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 288 | Py_INCREF(globals); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 289 | f->f_globals = globals; |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 290 | if (code->co_flags & CO_NEWLOCALS) { |
| 291 | if (code->co_flags & CO_OPTIMIZED) |
| 292 | locals = NULL; /* Let fast_2_locals handle it */ |
| 293 | else { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 294 | locals = PyDict_New(); |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 295 | if (locals == NULL) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 296 | Py_DECREF(f); |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 297 | return NULL; |
| 298 | } |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 299 | } |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 300 | } |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 301 | else { |
| 302 | if (locals == NULL) |
| 303 | locals = globals; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 304 | Py_INCREF(locals); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 305 | } |
| 306 | f->f_locals = locals; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 307 | f->f_trace = NULL; |
Guido van Rossum | a027efa | 1997-05-05 20:56:21 +0000 | [diff] [blame] | 308 | 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] | 309 | f->f_tstate = tstate; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 310 | |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 311 | f->f_lasti = 0; |
Guido van Rossum | 747596a | 1997-01-24 04:00:21 +0000 | [diff] [blame] | 312 | f->f_lineno = code->co_firstlineno; |
Guido van Rossum | eb46d67 | 1997-08-02 02:59:08 +0000 | [diff] [blame] | 313 | f->f_restricted = (builtins != tstate->interp->builtins); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 314 | f->f_iblock = 0; |
| 315 | f->f_nlocals = code->co_nlocals; |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 316 | f->f_stacksize = code->co_stacksize; |
| 317 | f->f_ncells = ncells; |
| 318 | f->f_nfreevars = nfrees; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 319 | |
| 320 | while (--extras >= 0) |
| 321 | f->f_localsplus[extras] = NULL; |
| 322 | |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 323 | f->f_valuestack = f->f_localsplus + (f->f_nlocals + ncells + nfrees); |
Tim Peters | 8c96369 | 2001-06-23 05:26:56 +0000 | [diff] [blame] | 324 | f->f_stacktop = f->f_valuestack; |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 325 | _PyObject_GC_TRACK(f); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 326 | return f; |
| 327 | } |
| 328 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 329 | /* Block management */ |
| 330 | |
| 331 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 332 | PyFrame_BlockSetup(PyFrameObject *f, int type, int handler, int level) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 333 | { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 334 | PyTryBlock *b; |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 335 | if (f->f_iblock >= CO_MAXBLOCKS) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 336 | Py_FatalError("XXX block stack overflow"); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 337 | b = &f->f_blockstack[f->f_iblock++]; |
| 338 | b->b_type = type; |
| 339 | b->b_level = level; |
| 340 | b->b_handler = handler; |
| 341 | } |
| 342 | |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 343 | PyTryBlock * |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 344 | PyFrame_BlockPop(PyFrameObject *f) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 345 | { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 346 | PyTryBlock *b; |
Guido van Rossum | d7047b3 | 1995-01-02 19:07:15 +0000 | [diff] [blame] | 347 | if (f->f_iblock <= 0) |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 348 | Py_FatalError("XXX block stack underflow"); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 349 | b = &f->f_blockstack[--f->f_iblock]; |
| 350 | return b; |
| 351 | } |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 352 | |
| 353 | /* Convert between "fast" version of locals and dictionary version */ |
| 354 | |
Guido van Rossum | f68d8e5 | 2001-04-14 17:55:09 +0000 | [diff] [blame] | 355 | static void |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 356 | map_to_dict(PyObject *map, int nmap, PyObject *dict, PyObject **values, |
| 357 | int deref) |
| 358 | { |
| 359 | int j; |
| 360 | for (j = nmap; --j >= 0; ) { |
Jeremy Hylton | 1a48ca8 | 2001-12-06 15:48:16 +0000 | [diff] [blame] | 361 | PyObject *key = PyTuple_GET_ITEM(map, j); |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 362 | PyObject *value = values[j]; |
| 363 | if (deref) |
| 364 | value = PyCell_GET(value); |
| 365 | if (value == NULL) { |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 366 | if (PyDict_DelItem(dict, key) != 0) |
| 367 | PyErr_Clear(); |
| 368 | } |
| 369 | else { |
| 370 | if (PyDict_SetItem(dict, key, value) != 0) |
| 371 | PyErr_Clear(); |
| 372 | } |
| 373 | } |
| 374 | } |
| 375 | |
Guido van Rossum | 6b356e7 | 2001-04-14 17:55:41 +0000 | [diff] [blame] | 376 | static void |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 377 | dict_to_map(PyObject *map, int nmap, PyObject *dict, PyObject **values, |
| 378 | int deref, int clear) |
| 379 | { |
| 380 | int j; |
| 381 | for (j = nmap; --j >= 0; ) { |
Jeremy Hylton | 1a48ca8 | 2001-12-06 15:48:16 +0000 | [diff] [blame] | 382 | PyObject *key = PyTuple_GET_ITEM(map, j); |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 383 | PyObject *value = PyDict_GetItem(dict, key); |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 384 | if (deref) { |
Jeremy Hylton | 4c88901 | 2001-05-08 04:08:59 +0000 | [diff] [blame] | 385 | if (value || clear) { |
Jeremy Hylton | 1a48ca8 | 2001-12-06 15:48:16 +0000 | [diff] [blame] | 386 | if (PyCell_GET(values[j]) != value) { |
| 387 | if (PyCell_Set(values[j], value) < 0) |
| 388 | PyErr_Clear(); |
| 389 | } |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 390 | } |
| 391 | } else if (value != NULL || clear) { |
Jeremy Hylton | 1a48ca8 | 2001-12-06 15:48:16 +0000 | [diff] [blame] | 392 | if (values[j] != value) { |
| 393 | Py_XINCREF(value); |
| 394 | Py_XDECREF(values[j]); |
| 395 | values[j] = value; |
| 396 | } |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 397 | } |
| 398 | } |
| 399 | } |
Jeremy Hylton | 2b724da | 2001-01-29 22:51:52 +0000 | [diff] [blame] | 400 | |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 401 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 402 | PyFrame_FastToLocals(PyFrameObject *f) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 403 | { |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 404 | /* Merge fast locals into f->f_locals */ |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 405 | PyObject *locals, *map; |
| 406 | PyObject **fast; |
| 407 | PyObject *error_type, *error_value, *error_traceback; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 408 | int j; |
| 409 | if (f == NULL) |
| 410 | return; |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 411 | locals = f->f_locals; |
| 412 | if (locals == NULL) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 413 | locals = f->f_locals = PyDict_New(); |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 414 | if (locals == NULL) { |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 415 | PyErr_Clear(); /* Can't report it :-( */ |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 416 | return; |
| 417 | } |
| 418 | } |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 419 | if (f->f_nlocals == 0) |
Guido van Rossum | bdd207a | 1995-07-26 16:14:30 +0000 | [diff] [blame] | 420 | return; |
| 421 | map = f->f_code->co_varnames; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 422 | if (!PyDict_Check(locals) || !PyTuple_Check(map)) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 423 | return; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 424 | PyErr_Fetch(&error_type, &error_value, &error_traceback); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 425 | fast = f->f_localsplus; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 426 | j = PyTuple_Size(map); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 427 | if (j > f->f_nlocals) |
| 428 | j = f->f_nlocals; |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 429 | map_to_dict(map, j, locals, fast, 0); |
| 430 | if (f->f_ncells || f->f_nfreevars) { |
| 431 | if (!(PyTuple_Check(f->f_code->co_cellvars) |
| 432 | && PyTuple_Check(f->f_code->co_freevars))) { |
| 433 | Py_DECREF(locals); |
| 434 | return; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 435 | } |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 436 | map_to_dict(f->f_code->co_cellvars, |
| 437 | PyTuple_GET_SIZE(f->f_code->co_cellvars), |
| 438 | locals, fast + f->f_nlocals, 1); |
| 439 | map_to_dict(f->f_code->co_freevars, |
| 440 | PyTuple_GET_SIZE(f->f_code->co_freevars), |
| 441 | locals, fast + f->f_nlocals + f->f_ncells, 1); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 442 | } |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 443 | PyErr_Restore(error_type, error_value, error_traceback); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 447 | PyFrame_LocalsToFast(PyFrameObject *f, int clear) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 448 | { |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 449 | /* Merge f->f_locals into fast locals */ |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 450 | PyObject *locals, *map; |
| 451 | PyObject **fast; |
| 452 | PyObject *error_type, *error_value, *error_traceback; |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 453 | int j; |
| 454 | if (f == NULL) |
| 455 | return; |
| 456 | locals = f->f_locals; |
Guido van Rossum | 2271bf7 | 1995-07-18 14:30:34 +0000 | [diff] [blame] | 457 | map = f->f_code->co_varnames; |
Guido van Rossum | 3bb63a8 | 1997-01-20 04:29:16 +0000 | [diff] [blame] | 458 | if (locals == NULL || f->f_code->co_nlocals == 0) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 459 | return; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 460 | if (!PyDict_Check(locals) || !PyTuple_Check(map)) |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 461 | return; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 462 | PyErr_Fetch(&error_type, &error_value, &error_traceback); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 463 | fast = f->f_localsplus; |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 464 | j = PyTuple_Size(map); |
Guido van Rossum | f3e85a0 | 1997-01-20 04:20:52 +0000 | [diff] [blame] | 465 | if (j > f->f_nlocals) |
| 466 | j = f->f_nlocals; |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 467 | dict_to_map(f->f_code->co_varnames, j, locals, fast, 0, clear); |
| 468 | if (f->f_ncells || f->f_nfreevars) { |
| 469 | if (!(PyTuple_Check(f->f_code->co_cellvars) |
| 470 | && PyTuple_Check(f->f_code->co_freevars))) |
| 471 | return; |
| 472 | dict_to_map(f->f_code->co_cellvars, |
| 473 | PyTuple_GET_SIZE(f->f_code->co_cellvars), |
Jeremy Hylton | 4c88901 | 2001-05-08 04:08:59 +0000 | [diff] [blame] | 474 | locals, fast + f->f_nlocals, 1, clear); |
Jeremy Hylton | 220ae7c | 2001-03-21 16:43:47 +0000 | [diff] [blame] | 475 | dict_to_map(f->f_code->co_freevars, |
| 476 | PyTuple_GET_SIZE(f->f_code->co_freevars), |
Jeremy Hylton | 4c88901 | 2001-05-08 04:08:59 +0000 | [diff] [blame] | 477 | locals, fast + f->f_nlocals + f->f_ncells, 1, clear); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 478 | } |
Guido van Rossum | 1875247 | 1997-04-29 14:49:28 +0000 | [diff] [blame] | 479 | PyErr_Restore(error_type, error_value, error_traceback); |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 480 | } |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 481 | |
| 482 | /* Clear out the free list */ |
| 483 | |
| 484 | void |
Fred Drake | 1b190b4 | 2000-07-09 05:40:56 +0000 | [diff] [blame] | 485 | PyFrame_Fini(void) |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 486 | { |
| 487 | while (free_list != NULL) { |
| 488 | PyFrameObject *f = free_list; |
| 489 | free_list = free_list->f_back; |
Neil Schemenauer | 4f4817f | 2001-08-29 23:52:17 +0000 | [diff] [blame] | 490 | PyObject_GC_Del(f); |
Tim Peters | b7ba743 | 2002-04-13 05:21:47 +0000 | [diff] [blame] | 491 | --numfree; |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 492 | } |
Tim Peters | b7ba743 | 2002-04-13 05:21:47 +0000 | [diff] [blame] | 493 | assert(numfree == 0); |
Guido van Rossum | 404b95d | 1997-08-05 02:09:46 +0000 | [diff] [blame] | 494 | } |