| |
| /* Frame object implementation */ |
| |
| #include "Python.h" |
| |
| #include "compile.h" |
| #include "frameobject.h" |
| #include "opcode.h" |
| #include "structmember.h" |
| |
| #undef MIN |
| #undef MAX |
| #define MIN(a, b) ((a) < (b) ? (a) : (b)) |
| #define MAX(a, b) ((a) > (b) ? (a) : (b)) |
| |
| #define OFF(x) offsetof(PyFrameObject, x) |
| |
| static PyMemberDef frame_memberlist[] = { |
| {"f_back", T_OBJECT, OFF(f_back), RO}, |
| {"f_code", T_OBJECT, OFF(f_code), RO}, |
| {"f_builtins", T_OBJECT, OFF(f_builtins),RO}, |
| {"f_globals", T_OBJECT, OFF(f_globals), RO}, |
| {"f_lasti", T_INT, OFF(f_lasti), RO}, |
| {"f_restricted",T_INT, OFF(f_restricted),RO}, |
| {"f_exc_type", T_OBJECT, OFF(f_exc_type)}, |
| {"f_exc_value", T_OBJECT, OFF(f_exc_value)}, |
| {"f_exc_traceback", T_OBJECT, OFF(f_exc_traceback)}, |
| {NULL} /* Sentinel */ |
| }; |
| |
| static PyObject * |
| frame_getlocals(PyFrameObject *f, void *closure) |
| { |
| PyFrame_FastToLocals(f); |
| Py_INCREF(f->f_locals); |
| return f->f_locals; |
| } |
| |
| static PyObject * |
| frame_getlineno(PyFrameObject *f, void *closure) |
| { |
| int lineno; |
| |
| if (f->f_trace) |
| lineno = f->f_lineno; |
| else |
| lineno = PyCode_Addr2Line(f->f_code, f->f_lasti); |
| |
| return PyInt_FromLong(lineno); |
| } |
| |
| /* Setter for f_lineno - you can set f_lineno from within a trace function in |
| * order to jump to a given line of code, subject to some restrictions. Most |
| * lines are OK to jump to because they don't make any assumptions about the |
| * state of the stack (obvious because you could remove the line and the code |
| * would still work without any stack errors), but there are some constructs |
| * that limit jumping: |
| * |
| * o Lines with an 'except' statement on them can't be jumped to, because |
| * they expect an exception to be on the top of the stack. |
| * o Lines that live in a 'finally' block can't be jumped from or to, since |
| * the END_FINALLY expects to clean up the stack after the 'try' block. |
| * o 'try'/'for'/'while' blocks can't be jumped into because the blockstack |
| * needs to be set up before their code runs, and for 'for' loops the |
| * iterator needs to be on the stack. |
| */ |
| static int |
| frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno) |
| { |
| int new_lineno = 0; /* The new value of f_lineno */ |
| int new_lasti = 0; /* The new value of f_lasti */ |
| int new_iblock = 0; /* The new value of f_iblock */ |
| char *code = NULL; /* The bytecode for the frame... */ |
| int code_len = 0; /* ...and its length */ |
| char *lnotab = NULL; /* Iterating over co_lnotab */ |
| int lnotab_len = 0; /* (ditto) */ |
| int offset = 0; /* (ditto) */ |
| int line = 0; /* (ditto) */ |
| int addr = 0; /* (ditto) */ |
| int min_addr = 0; /* Scanning the SETUPs and POPs */ |
| int max_addr = 0; /* (ditto) */ |
| int delta_iblock = 0; /* (ditto) */ |
| int min_delta_iblock = 0; /* (ditto) */ |
| int min_iblock = 0; /* (ditto) */ |
| int f_lasti_setup_addr = 0; /* Policing no-jump-into-finally */ |
| int new_lasti_setup_addr = 0; /* (ditto) */ |
| int blockstack[CO_MAXBLOCKS]; /* Walking the 'finally' blocks */ |
| int in_finally[CO_MAXBLOCKS]; /* (ditto) */ |
| int blockstack_top = 0; /* (ditto) */ |
| int setup_op = 0; /* (ditto) */ |
| |
| /* f_lineno must be an integer. */ |
| if (!PyInt_Check(p_new_lineno)) { |
| PyErr_SetString(PyExc_ValueError, |
| "lineno must be an integer"); |
| return -1; |
| } |
| |
| /* You can only do this from within a trace function, not via |
| * _getframe or similar hackery. */ |
| if (!f->f_trace) |
| { |
| PyErr_Format(PyExc_ValueError, |
| "f_lineno can only be set by a trace function"); |
| return -1; |
| } |
| |
| /* Fail if the line comes before the start of the code block. */ |
| new_lineno = (int) PyInt_AsLong(p_new_lineno); |
| if (new_lineno < f->f_code->co_firstlineno) { |
| PyErr_Format(PyExc_ValueError, |
| "line %d comes before the current code block", |
| new_lineno); |
| return -1; |
| } |
| |
| /* Find the bytecode offset for the start of the given line, or the |
| * first code-owning line after it. */ |
| PyString_AsStringAndSize(f->f_code->co_lnotab, &lnotab, &lnotab_len); |
| addr = 0; |
| line = f->f_code->co_firstlineno; |
| new_lasti = -1; |
| for (offset = 0; offset < lnotab_len; offset += 2) { |
| addr += lnotab[offset]; |
| line += lnotab[offset+1]; |
| if (line >= new_lineno) { |
| new_lasti = addr; |
| new_lineno = line; |
| break; |
| } |
| } |
| |
| /* If we didn't reach the requested line, return an error. */ |
| if (new_lasti == -1) { |
| PyErr_Format(PyExc_ValueError, |
| "line %d comes after the current code block", |
| new_lineno); |
| return -1; |
| } |
| |
| /* We're now ready to look at the bytecode. */ |
| PyString_AsStringAndSize(f->f_code->co_code, &code, &code_len); |
| min_addr = MIN(new_lasti, f->f_lasti); |
| max_addr = MAX(new_lasti, f->f_lasti); |
| |
| /* You can't jump onto a line with an 'except' statement on it - |
| * they expect to have an exception on the top of the stack, which |
| * won't be true if you jump to them. They always start with code |
| * that either pops the exception using POP_TOP (plain 'except:' |
| * lines do this) or duplicates the exception on the stack using |
| * DUP_TOP (if there's an exception type specified). See compile.c, |
| * 'com_try_except' for the full details. There aren't any other |
| * cases (AFAIK) where a line's code can start with DUP_TOP or |
| * POP_TOP, but if any ever appear, they'll be subject to the same |
| * restriction (but with a different error message). */ |
| if (code[new_lasti] == DUP_TOP || code[new_lasti] == POP_TOP) { |
| PyErr_SetString(PyExc_ValueError, |
| "can't jump to 'except' line as there's no exception"); |
| return -1; |
| } |
| |
| /* You can't jump into or out of a 'finally' block because the 'try' |
| * block leaves something on the stack for the END_FINALLY to clean |
| * up. So we walk the bytecode, maintaining a simulated blockstack. |
| * When we reach the old or new address and it's in a 'finally' block |
| * we note the address of the corresponding SETUP_FINALLY. The jump |
| * is only legal if neither address is in a 'finally' block or |
| * they're both in the same one. 'blockstack' is a stack of the |
| * bytecode addresses of the SETUP_X opcodes, and 'in_finally' tracks |
| * whether we're in a 'finally' block at each blockstack level. */ |
| f_lasti_setup_addr = -1; |
| new_lasti_setup_addr = -1; |
| memset(blockstack, '\0', sizeof(blockstack)); |
| memset(in_finally, '\0', sizeof(in_finally)); |
| blockstack_top = 0; |
| for (addr = 0; addr < code_len; addr++) { |
| unsigned char op = code[addr]; |
| switch (op) { |
| case SETUP_LOOP: |
| case SETUP_EXCEPT: |
| case SETUP_FINALLY: |
| blockstack[blockstack_top++] = addr; |
| in_finally[blockstack_top-1] = 0; |
| break; |
| |
| case POP_BLOCK: |
| assert(blockstack_top > 0); |
| setup_op = code[blockstack[blockstack_top-1]]; |
| if (setup_op == SETUP_FINALLY) { |
| in_finally[blockstack_top-1] = 1; |
| } |
| else { |
| blockstack_top--; |
| } |
| break; |
| |
| case END_FINALLY: |
| /* Ignore END_FINALLYs for SETUP_EXCEPTs - they exist |
| * in the bytecode but don't correspond to an actual |
| * 'finally' block. (If blockstack_top is 0, we must |
| * be seeing such an END_FINALLY.) */ |
| if (blockstack_top > 0) { |
| setup_op = code[blockstack[blockstack_top-1]]; |
| if (setup_op == SETUP_FINALLY) { |
| blockstack_top--; |
| } |
| } |
| break; |
| } |
| |
| /* For the addresses we're interested in, see whether they're |
| * within a 'finally' block and if so, remember the address |
| * of the SETUP_FINALLY. */ |
| if (addr == new_lasti || addr == f->f_lasti) { |
| int i = 0; |
| int setup_addr = -1; |
| for (i = blockstack_top-1; i >= 0; i--) { |
| if (in_finally[i]) { |
| setup_addr = blockstack[i]; |
| break; |
| } |
| } |
| |
| if (setup_addr != -1) { |
| if (addr == new_lasti) { |
| new_lasti_setup_addr = setup_addr; |
| } |
| |
| if (addr == f->f_lasti) { |
| f_lasti_setup_addr = setup_addr; |
| } |
| } |
| } |
| |
| if (op >= HAVE_ARGUMENT) { |
| addr += 2; |
| } |
| } |
| |
| /* Verify that the blockstack tracking code didn't get lost. */ |
| assert(blockstack_top == 0); |
| |
| /* After all that, are we jumping into / out of a 'finally' block? */ |
| if (new_lasti_setup_addr != f_lasti_setup_addr) { |
| PyErr_SetString(PyExc_ValueError, |
| "can't jump into or out of a 'finally' block"); |
| return -1; |
| } |
| |
| |
| /* Police block-jumping (you can't jump into the middle of a block) |
| * and ensure that the blockstack finishes up in a sensible state (by |
| * popping any blocks we're jumping out of). We look at all the |
| * blockstack operations between the current position and the new |
| * one, and keep track of how many blocks we drop out of on the way. |
| * By also keeping track of the lowest blockstack position we see, we |
| * can tell whether the jump goes into any blocks without coming out |
| * again - in that case we raise an exception below. */ |
| delta_iblock = 0; |
| for (addr = min_addr; addr < max_addr; addr++) { |
| unsigned char op = code[addr]; |
| switch (op) { |
| case SETUP_LOOP: |
| case SETUP_EXCEPT: |
| case SETUP_FINALLY: |
| delta_iblock++; |
| break; |
| |
| case POP_BLOCK: |
| delta_iblock--; |
| break; |
| } |
| |
| min_delta_iblock = MIN(min_delta_iblock, delta_iblock); |
| |
| if (op >= HAVE_ARGUMENT) { |
| addr += 2; |
| } |
| } |
| |
| /* Derive the absolute iblock values from the deltas. */ |
| min_iblock = f->f_iblock + min_delta_iblock; |
| if (new_lasti > f->f_lasti) { |
| /* Forwards jump. */ |
| new_iblock = f->f_iblock + delta_iblock; |
| } |
| else { |
| /* Backwards jump. */ |
| new_iblock = f->f_iblock - delta_iblock; |
| } |
| |
| /* Are we jumping into a block? */ |
| if (new_iblock > min_iblock) { |
| PyErr_SetString(PyExc_ValueError, |
| "can't jump into the middle of a block"); |
| return -1; |
| } |
| |
| /* Pop any blocks that we're jumping out of. */ |
| while (f->f_iblock > new_iblock) { |
| PyTryBlock *b = &f->f_blockstack[--f->f_iblock]; |
| while ((f->f_stacktop - f->f_valuestack) > b->b_level) { |
| PyObject *v = (*--f->f_stacktop); |
| Py_DECREF(v); |
| } |
| } |
| |
| /* Finally set the new f_lineno and f_lasti and return OK. */ |
| f->f_lineno = new_lineno; |
| f->f_lasti = new_lasti; |
| return 0; |
| } |
| |
| static PyObject * |
| frame_gettrace(PyFrameObject *f, void *closure) |
| { |
| PyObject* trace = f->f_trace; |
| |
| if (trace == NULL) |
| trace = Py_None; |
| |
| Py_INCREF(trace); |
| |
| return trace; |
| } |
| |
| static int |
| frame_settrace(PyFrameObject *f, PyObject* v, void *closure) |
| { |
| /* We rely on f_lineno being accurate when f_trace is set. */ |
| |
| PyObject* old_value = f->f_trace; |
| |
| Py_XINCREF(v); |
| f->f_trace = v; |
| |
| if (v != NULL) |
| f->f_lineno = PyCode_Addr2Line(f->f_code, f->f_lasti); |
| |
| Py_XDECREF(old_value); |
| |
| return 0; |
| } |
| |
| static PyGetSetDef frame_getsetlist[] = { |
| {"f_locals", (getter)frame_getlocals, NULL, NULL}, |
| {"f_lineno", (getter)frame_getlineno, |
| (setter)frame_setlineno, NULL}, |
| {"f_trace", (getter)frame_gettrace, (setter)frame_settrace, NULL}, |
| {0} |
| }; |
| |
| /* Stack frames are allocated and deallocated at a considerable rate. |
| In an attempt to improve the speed of function calls, we maintain a |
| separate free list of stack frames (just like integers are |
| allocated in a special way -- see intobject.c). When a stack frame |
| is on the free list, only the following members have a meaning: |
| ob_type == &Frametype |
| f_back next item on free list, or NULL |
| f_nlocals number of locals |
| f_stacksize size of value stack |
| ob_size size of localsplus |
| Note that the value and block stacks are preserved -- this can save |
| another malloc() call or two (and two free() calls as well!). |
| Also note that, unlike for integers, each frame object is a |
| malloc'ed object in its own right -- it is only the actual calls to |
| malloc() that we are trying to save here, not the administration. |
| After all, while a typical program may make millions of calls, a |
| call depth of more than 20 or 30 is probably already exceptional |
| unless the program contains run-away recursion. I hope. |
| |
| Later, MAXFREELIST was added to bound the # of frames saved on |
| free_list. Else programs creating lots of cyclic trash involving |
| frames could provoke free_list into growing without bound. |
| */ |
| |
| static PyFrameObject *free_list = NULL; |
| static int numfree = 0; /* number of frames currently in free_list */ |
| #define MAXFREELIST 200 /* max value for numfree */ |
| |
| static void |
| frame_dealloc(PyFrameObject *f) |
| { |
| int i, slots; |
| PyObject **fastlocals; |
| PyObject **p; |
| |
| PyObject_GC_UnTrack(f); |
| Py_TRASHCAN_SAFE_BEGIN(f) |
| /* Kill all local variables */ |
| slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
| fastlocals = f->f_localsplus; |
| for (i = slots; --i >= 0; ++fastlocals) { |
| Py_XDECREF(*fastlocals); |
| } |
| |
| /* Free stack */ |
| if (f->f_stacktop != NULL) { |
| for (p = f->f_valuestack; p < f->f_stacktop; p++) |
| Py_XDECREF(*p); |
| } |
| |
| Py_XDECREF(f->f_back); |
| Py_DECREF(f->f_code); |
| Py_DECREF(f->f_builtins); |
| Py_DECREF(f->f_globals); |
| Py_XDECREF(f->f_locals); |
| Py_XDECREF(f->f_trace); |
| Py_XDECREF(f->f_exc_type); |
| Py_XDECREF(f->f_exc_value); |
| Py_XDECREF(f->f_exc_traceback); |
| if (numfree < MAXFREELIST) { |
| ++numfree; |
| f->f_back = free_list; |
| free_list = f; |
| } |
| else |
| PyObject_GC_Del(f); |
| Py_TRASHCAN_SAFE_END(f) |
| } |
| |
| static int |
| frame_traverse(PyFrameObject *f, visitproc visit, void *arg) |
| { |
| PyObject **fastlocals, **p; |
| int i, err, slots; |
| #define VISIT(o) if (o) {if ((err = visit((PyObject *)(o), arg))) return err;} |
| |
| VISIT(f->f_back); |
| VISIT(f->f_code); |
| VISIT(f->f_builtins); |
| VISIT(f->f_globals); |
| VISIT(f->f_locals); |
| VISIT(f->f_trace); |
| VISIT(f->f_exc_type); |
| VISIT(f->f_exc_value); |
| VISIT(f->f_exc_traceback); |
| |
| /* locals */ |
| slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
| fastlocals = f->f_localsplus; |
| for (i = slots; --i >= 0; ++fastlocals) { |
| VISIT(*fastlocals); |
| } |
| |
| /* stack */ |
| if (f->f_stacktop != NULL) { |
| for (p = f->f_valuestack; p < f->f_stacktop; p++) |
| VISIT(*p); |
| } |
| return 0; |
| } |
| |
| static void |
| frame_clear(PyFrameObject *f) |
| { |
| PyObject **fastlocals, **p; |
| int i, slots; |
| |
| Py_XDECREF(f->f_exc_type); |
| f->f_exc_type = NULL; |
| |
| Py_XDECREF(f->f_exc_value); |
| f->f_exc_value = NULL; |
| |
| Py_XDECREF(f->f_exc_traceback); |
| f->f_exc_traceback = NULL; |
| |
| Py_XDECREF(f->f_trace); |
| f->f_trace = NULL; |
| |
| /* locals */ |
| slots = f->f_nlocals + f->f_ncells + f->f_nfreevars; |
| fastlocals = f->f_localsplus; |
| for (i = slots; --i >= 0; ++fastlocals) { |
| if (*fastlocals != NULL) { |
| Py_XDECREF(*fastlocals); |
| *fastlocals = NULL; |
| } |
| } |
| |
| /* stack */ |
| if (f->f_stacktop != NULL) { |
| for (p = f->f_valuestack; p < f->f_stacktop; p++) { |
| Py_XDECREF(*p); |
| *p = NULL; |
| } |
| } |
| } |
| |
| |
| PyTypeObject PyFrame_Type = { |
| PyObject_HEAD_INIT(&PyType_Type) |
| 0, |
| "frame", |
| sizeof(PyFrameObject), |
| sizeof(PyObject *), |
| (destructor)frame_dealloc, /* tp_dealloc */ |
| 0, /* tp_print */ |
| 0, /* tp_getattr */ |
| 0, /* tp_setattr */ |
| 0, /* tp_compare */ |
| 0, /* tp_repr */ |
| 0, /* tp_as_number */ |
| 0, /* tp_as_sequence */ |
| 0, /* tp_as_mapping */ |
| 0, /* tp_hash */ |
| 0, /* tp_call */ |
| 0, /* tp_str */ |
| PyObject_GenericGetAttr, /* tp_getattro */ |
| PyObject_GenericSetAttr, /* tp_setattro */ |
| 0, /* tp_as_buffer */ |
| Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */ |
| 0, /* tp_doc */ |
| (traverseproc)frame_traverse, /* tp_traverse */ |
| (inquiry)frame_clear, /* tp_clear */ |
| 0, /* tp_richcompare */ |
| 0, /* tp_weaklistoffset */ |
| 0, /* tp_iter */ |
| 0, /* tp_iternext */ |
| 0, /* tp_methods */ |
| frame_memberlist, /* tp_members */ |
| frame_getsetlist, /* tp_getset */ |
| 0, /* tp_base */ |
| 0, /* tp_dict */ |
| }; |
| |
| static PyObject *builtin_object; |
| |
| int _PyFrame_Init() |
| { |
| builtin_object = PyString_InternFromString("__builtins__"); |
| return (builtin_object != NULL); |
| } |
| |
| PyFrameObject * |
| PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals, |
| PyObject *locals) |
| { |
| PyFrameObject *back = tstate->frame; |
| PyFrameObject *f; |
| PyObject *builtins; |
| int extras, ncells, nfrees; |
| |
| #ifdef Py_DEBUG |
| if (code == NULL || globals == NULL || !PyDict_Check(globals) || |
| (locals != NULL && !PyDict_Check(locals))) { |
| PyErr_BadInternalCall(); |
| return NULL; |
| } |
| #endif |
| ncells = PyTuple_GET_SIZE(code->co_cellvars); |
| nfrees = PyTuple_GET_SIZE(code->co_freevars); |
| extras = code->co_stacksize + code->co_nlocals + ncells + nfrees; |
| if (back == NULL || back->f_globals != globals) { |
| builtins = PyDict_GetItem(globals, builtin_object); |
| if (builtins) { |
| if (PyModule_Check(builtins)) { |
| builtins = PyModule_GetDict(builtins); |
| assert(!builtins || PyDict_Check(builtins)); |
| } |
| else if (!PyDict_Check(builtins)) |
| builtins = NULL; |
| } |
| if (builtins == NULL) { |
| /* No builtins! Make up a minimal one |
| Give them 'None', at least. */ |
| builtins = PyDict_New(); |
| if (builtins == NULL || |
| PyDict_SetItemString( |
| builtins, "None", Py_None) < 0) |
| return NULL; |
| } |
| else |
| Py_INCREF(builtins); |
| |
| } |
| else { |
| /* If we share the globals, we share the builtins. |
| Save a lookup and a call. */ |
| builtins = back->f_builtins; |
| assert(builtins != NULL && PyDict_Check(builtins)); |
| Py_INCREF(builtins); |
| } |
| if (free_list == NULL) { |
| f = PyObject_GC_NewVar(PyFrameObject, &PyFrame_Type, extras); |
| if (f == NULL) |
| return NULL; |
| } |
| else { |
| assert(numfree > 0); |
| --numfree; |
| f = free_list; |
| free_list = free_list->f_back; |
| if (f->ob_size < extras) { |
| f = PyObject_GC_Resize(PyFrameObject, f, extras); |
| if (f == NULL) |
| return NULL; |
| } |
| _Py_NewReference((PyObject *)f); |
| } |
| f->f_builtins = builtins; |
| Py_XINCREF(back); |
| f->f_back = back; |
| Py_INCREF(code); |
| f->f_code = code; |
| Py_INCREF(globals); |
| f->f_globals = globals; |
| /* Most functions have CO_NEWLOCALS and CO_OPTIMIZED set. */ |
| if ((code->co_flags & (CO_NEWLOCALS | CO_OPTIMIZED)) == |
| (CO_NEWLOCALS | CO_OPTIMIZED)) |
| locals = NULL; /* PyFrame_FastToLocals() will set. */ |
| else if (code->co_flags & CO_NEWLOCALS) { |
| locals = PyDict_New(); |
| if (locals == NULL) { |
| Py_DECREF(f); |
| return NULL; |
| } |
| } |
| else { |
| if (locals == NULL) |
| locals = globals; |
| Py_INCREF(locals); |
| } |
| f->f_locals = locals; |
| f->f_trace = NULL; |
| f->f_exc_type = f->f_exc_value = f->f_exc_traceback = NULL; |
| f->f_tstate = tstate; |
| |
| f->f_lasti = -1; |
| f->f_lineno = code->co_firstlineno; |
| f->f_restricted = (builtins != tstate->interp->builtins); |
| f->f_iblock = 0; |
| f->f_nlocals = code->co_nlocals; |
| f->f_stacksize = code->co_stacksize; |
| f->f_ncells = ncells; |
| f->f_nfreevars = nfrees; |
| |
| extras = f->f_nlocals + ncells + nfrees; |
| memset(f->f_localsplus, 0, extras * sizeof(f->f_localsplus[0])); |
| |
| f->f_valuestack = f->f_localsplus + extras; |
| f->f_stacktop = f->f_valuestack; |
| _PyObject_GC_TRACK(f); |
| return f; |
| } |
| |
| /* Block management */ |
| |
| void |
| PyFrame_BlockSetup(PyFrameObject *f, int type, int handler, int level) |
| { |
| PyTryBlock *b; |
| if (f->f_iblock >= CO_MAXBLOCKS) |
| Py_FatalError("XXX block stack overflow"); |
| b = &f->f_blockstack[f->f_iblock++]; |
| b->b_type = type; |
| b->b_level = level; |
| b->b_handler = handler; |
| } |
| |
| PyTryBlock * |
| PyFrame_BlockPop(PyFrameObject *f) |
| { |
| PyTryBlock *b; |
| if (f->f_iblock <= 0) |
| Py_FatalError("XXX block stack underflow"); |
| b = &f->f_blockstack[--f->f_iblock]; |
| return b; |
| } |
| |
| /* Convert between "fast" version of locals and dictionary version */ |
| |
| static void |
| map_to_dict(PyObject *map, int nmap, PyObject *dict, PyObject **values, |
| int deref) |
| { |
| int j; |
| for (j = nmap; --j >= 0; ) { |
| PyObject *key = PyTuple_GET_ITEM(map, j); |
| PyObject *value = values[j]; |
| if (deref) |
| value = PyCell_GET(value); |
| if (value == NULL) { |
| if (PyDict_DelItem(dict, key) != 0) |
| PyErr_Clear(); |
| } |
| else { |
| if (PyDict_SetItem(dict, key, value) != 0) |
| PyErr_Clear(); |
| } |
| } |
| } |
| |
| static void |
| dict_to_map(PyObject *map, int nmap, PyObject *dict, PyObject **values, |
| int deref, int clear) |
| { |
| int j; |
| for (j = nmap; --j >= 0; ) { |
| PyObject *key = PyTuple_GET_ITEM(map, j); |
| PyObject *value = PyDict_GetItem(dict, key); |
| if (deref) { |
| if (value || clear) { |
| if (PyCell_GET(values[j]) != value) { |
| if (PyCell_Set(values[j], value) < 0) |
| PyErr_Clear(); |
| } |
| } |
| } else if (value != NULL || clear) { |
| if (values[j] != value) { |
| Py_XINCREF(value); |
| Py_XDECREF(values[j]); |
| values[j] = value; |
| } |
| } |
| } |
| } |
| |
| void |
| PyFrame_FastToLocals(PyFrameObject *f) |
| { |
| /* Merge fast locals into f->f_locals */ |
| PyObject *locals, *map; |
| PyObject **fast; |
| PyObject *error_type, *error_value, *error_traceback; |
| int j; |
| if (f == NULL) |
| return; |
| locals = f->f_locals; |
| if (locals == NULL) { |
| locals = f->f_locals = PyDict_New(); |
| if (locals == NULL) { |
| PyErr_Clear(); /* Can't report it :-( */ |
| return; |
| } |
| } |
| map = f->f_code->co_varnames; |
| if (!PyDict_Check(locals) || !PyTuple_Check(map)) |
| return; |
| PyErr_Fetch(&error_type, &error_value, &error_traceback); |
| fast = f->f_localsplus; |
| j = PyTuple_Size(map); |
| if (j > f->f_nlocals) |
| j = f->f_nlocals; |
| if (f->f_nlocals) |
| map_to_dict(map, j, locals, fast, 0); |
| if (f->f_ncells || f->f_nfreevars) { |
| if (!(PyTuple_Check(f->f_code->co_cellvars) |
| && PyTuple_Check(f->f_code->co_freevars))) { |
| return; |
| } |
| map_to_dict(f->f_code->co_cellvars, |
| PyTuple_GET_SIZE(f->f_code->co_cellvars), |
| locals, fast + f->f_nlocals, 1); |
| map_to_dict(f->f_code->co_freevars, |
| PyTuple_GET_SIZE(f->f_code->co_freevars), |
| locals, fast + f->f_nlocals + f->f_ncells, 1); |
| } |
| PyErr_Restore(error_type, error_value, error_traceback); |
| } |
| |
| void |
| PyFrame_LocalsToFast(PyFrameObject *f, int clear) |
| { |
| /* Merge f->f_locals into fast locals */ |
| PyObject *locals, *map; |
| PyObject **fast; |
| PyObject *error_type, *error_value, *error_traceback; |
| int j; |
| if (f == NULL) |
| return; |
| locals = f->f_locals; |
| map = f->f_code->co_varnames; |
| if (locals == NULL) |
| return; |
| if (!PyDict_Check(locals) || !PyTuple_Check(map)) |
| return; |
| PyErr_Fetch(&error_type, &error_value, &error_traceback); |
| fast = f->f_localsplus; |
| j = PyTuple_Size(map); |
| if (j > f->f_nlocals) |
| j = f->f_nlocals; |
| if (f->f_nlocals) |
| dict_to_map(f->f_code->co_varnames, j, locals, fast, 0, clear); |
| if (f->f_ncells || f->f_nfreevars) { |
| if (!(PyTuple_Check(f->f_code->co_cellvars) |
| && PyTuple_Check(f->f_code->co_freevars))) |
| return; |
| dict_to_map(f->f_code->co_cellvars, |
| PyTuple_GET_SIZE(f->f_code->co_cellvars), |
| locals, fast + f->f_nlocals, 1, clear); |
| dict_to_map(f->f_code->co_freevars, |
| PyTuple_GET_SIZE(f->f_code->co_freevars), |
| locals, fast + f->f_nlocals + f->f_ncells, 1, |
| clear); |
| } |
| PyErr_Restore(error_type, error_value, error_traceback); |
| } |
| |
| /* Clear out the free list */ |
| |
| void |
| PyFrame_Fini(void) |
| { |
| while (free_list != NULL) { |
| PyFrameObject *f = free_list; |
| free_list = free_list->f_back; |
| PyObject_GC_Del(f); |
| --numfree; |
| } |
| assert(numfree == 0); |
| Py_XDECREF(builtin_object); |
| builtin_object = NULL; |
| } |