mirror of https://github.com/python/cpython
Removed obsolete exception PyExc_AccessError.
Added PyErr_MemoryErrorInst to hold the pre-instantiated instance when using class based exceptions. Simplified the creation of all built-in exceptions, both class based and string based. Actually, for class based exceptions, the string ones are still created just in case there's a problem creating the class based ones (so you still get *some* exception handling!). Now the init and fini functions run through a list of structure elements, creating the strings (and optionally classes) for every entry. initerrors(): the new base class exceptions StandardError, LookupError, and NumberError are initialized when using string exceptions, to tuples containing the list of derived string exceptions. This GvR trick enables forward compatibility! One bit of nastiness is that the C code has to know the inheritance tree embodied in exceptions.py. Added the two phase init and fini functions.
This commit is contained in:
Barry Warsaw
parent
035574d755
commit
757af0e7bb
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@ -1724,7 +1724,10 @@ static PyMethodDef builtin_methods[] = {
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/* Predefined exceptions */
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PyObject *PyExc_AccessError;
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PyObject *PyExc_StandardError;
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PyObject *PyExc_NumberError;
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PyObject *PyExc_LookupError;
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PyObject *PyExc_AssertionError;
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PyObject *PyExc_AttributeError;
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PyObject *PyExc_EOFError;
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@ -1745,6 +1748,108 @@ PyObject *PyExc_TypeError;
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PyObject *PyExc_ValueError;
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PyObject *PyExc_ZeroDivisionError;
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PyObject *PyExc_MemoryErrorInst;
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static struct
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{
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char* name;
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PyObject** exc;
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int leaf_exc;
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}
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bltin_exc[] = {
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{"StandardError", &PyExc_StandardError, 0},
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{"NumberError", &PyExc_NumberError, 0},
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{"LookupError", &PyExc_LookupError, 0},
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{"AssertionError", &PyExc_AssertionError, 1},
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{"AttributeError", &PyExc_AttributeError, 1},
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{"EOFError", &PyExc_EOFError, 1},
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{"FloatingPointError", &PyExc_FloatingPointError, 1},
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{"IOError", &PyExc_IOError, 1},
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{"ImportError", &PyExc_ImportError, 1},
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{"IndexError", &PyExc_IndexError, 1},
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{"KeyError", &PyExc_KeyError, 1},
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{"KeyboardInterrupt", &PyExc_KeyboardInterrupt, 1},
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{"MemoryError", &PyExc_MemoryError, 1},
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{"NameError", &PyExc_NameError, 1},
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{"OverflowError", &PyExc_OverflowError, 1},
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{"RuntimeError", &PyExc_RuntimeError, 1},
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{"SyntaxError", &PyExc_SyntaxError, 1},
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{"SystemError", &PyExc_SystemError, 1},
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{"SystemExit", &PyExc_SystemExit, 1},
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{"TypeError", &PyExc_TypeError, 1},
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{"ValueError", &PyExc_ValueError, 1},
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{"ZeroDivisionError", &PyExc_ZeroDivisionError, 1},
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{NULL, NULL}
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};
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/* import exceptions module to extract class exceptions */
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static void
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init_class_exc(dict)
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PyObject *dict;
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{
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int i;
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PyObject *m = PyImport_ImportModule("exceptions");
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PyObject *d;
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PyObject *args;
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if (m == NULL ||
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(d = PyModule_GetDict(m)) == NULL)
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{
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PyObject *f = PySys_GetObject("stderr");
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if (Py_VerboseFlag) {
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PyFile_WriteString(
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"'import exceptions' failed; traceback:\n", f);
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PyErr_Print();
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}
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else {
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PyFile_WriteString(
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"'import exceptions' failed; use -v for traceback\n", f);
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PyErr_Clear();
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}
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PyFile_WriteString("defaulting to old style exceptions\n", f);
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return;
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}
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for (i = 0; bltin_exc[i].name; i++) {
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/* dig the exception out of the module */
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PyObject *exc = PyDict_GetItemString(d, bltin_exc[i].name);
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if (!exc)
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Py_FatalError("built-in exception cannot be initialized");
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Py_XDECREF(*bltin_exc[i].exc);
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/* squirrel away a pointer to the exception */
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Py_INCREF(exc);
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*bltin_exc[i].exc = exc;
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/* and insert the name in the __builtin__ module */
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PyDict_SetItemString(dict, bltin_exc[i].name, exc);
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}
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/* we need one pre-allocated instance */
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args = Py_BuildValue("()");
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if (args) {
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PyExc_MemoryErrorInst =
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PyEval_CallObject(PyExc_MemoryError, args);
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Py_DECREF(args);
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}
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/* we're done with the exceptions module */
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Py_DECREF(m);
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if (PyErr_Occurred())
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Py_FatalError("can't instantiate standard exceptions");
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}
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static void
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fini_instances()
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{
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Py_XDECREF(PyExc_MemoryErrorInst);
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PyExc_MemoryErrorInst = NULL;
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}
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static PyObject *
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newstdexception(dict, name)
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PyObject *dict;
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@ -1760,55 +1865,60 @@ static void
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initerrors(dict)
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PyObject *dict;
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{
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PyExc_AccessError = newstdexception(dict, "AccessError");
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PyExc_AssertionError = newstdexception(dict, "AssertionError");
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PyExc_AttributeError = newstdexception(dict, "AttributeError");
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PyExc_EOFError = newstdexception(dict, "EOFError");
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PyExc_FloatingPointError = newstdexception(dict, "FloatingPointError");
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PyExc_IOError = newstdexception(dict, "IOError");
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PyExc_ImportError = newstdexception(dict, "ImportError");
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PyExc_IndexError = newstdexception(dict, "IndexError");
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PyExc_KeyError = newstdexception(dict, "KeyError");
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PyExc_KeyboardInterrupt = newstdexception(dict, "KeyboardInterrupt");
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PyExc_MemoryError = newstdexception(dict, "MemoryError");
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PyExc_NameError = newstdexception(dict, "NameError");
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PyExc_OverflowError = newstdexception(dict, "OverflowError");
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PyExc_RuntimeError = newstdexception(dict, "RuntimeError");
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PyExc_SyntaxError = newstdexception(dict, "SyntaxError");
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PyExc_SystemError = newstdexception(dict, "SystemError");
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PyExc_SystemExit = newstdexception(dict, "SystemExit");
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PyExc_TypeError = newstdexception(dict, "TypeError");
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PyExc_ValueError = newstdexception(dict, "ValueError");
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PyExc_ZeroDivisionError = newstdexception(dict, "ZeroDivisionError");
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int i;
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int exccnt = 0;
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for (i = 0; bltin_exc[i].name; i++, exccnt++) {
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if (bltin_exc[i].leaf_exc)
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*bltin_exc[i].exc =
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newstdexception(dict, bltin_exc[i].name);
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}
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/* This is kind of bogus because we special case the three new
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exceptions to be nearly forward compatible. But this means we
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hard code knowledge about exceptions.py into C here. I don't
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have a better solution, though
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*/
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PyExc_LookupError = PyTuple_New(2);
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Py_INCREF(PyExc_IndexError);
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PyTuple_SET_ITEM(PyExc_LookupError, 0, PyExc_IndexError);
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Py_INCREF(PyExc_KeyError);
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PyTuple_SET_ITEM(PyExc_LookupError, 1, PyExc_KeyError);
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PyDict_SetItemString(dict, "LookupError", PyExc_LookupError);
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PyExc_NumberError = PyTuple_New(3);
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Py_INCREF(PyExc_OverflowError);
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PyTuple_SET_ITEM(PyExc_NumberError, 0, PyExc_OverflowError);
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Py_INCREF(PyExc_ZeroDivisionError);
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PyTuple_SET_ITEM(PyExc_NumberError, 1, PyExc_ZeroDivisionError);
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Py_INCREF(PyExc_FloatingPointError);
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PyTuple_SET_ITEM(PyExc_NumberError, 2, PyExc_FloatingPointError);
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PyDict_SetItemString(dict, "NumberError", PyExc_NumberError);
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PyExc_StandardError = PyTuple_New(exccnt-1);
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for (i = 1; bltin_exc[i].name; i++) {
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PyObject *exc = *bltin_exc[i].exc;
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Py_INCREF(exc);
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PyTuple_SET_ITEM(PyExc_StandardError, i-1, exc);
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}
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PyDict_SetItemString(dict, "StandardError", PyExc_StandardError);
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if (PyErr_Occurred())
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Py_FatalError("Could not initialize built-in string exceptions");
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}
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static void
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finierrors()
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{
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Py_XDECREF(PyExc_AccessError); PyExc_AccessError = NULL;
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Py_XDECREF(PyExc_AssertionError); PyExc_AssertionError = NULL;
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Py_XDECREF(PyExc_AttributeError); PyExc_AttributeError = NULL;
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Py_XDECREF(PyExc_EOFError); PyExc_EOFError = NULL;
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Py_XDECREF(PyExc_FloatingPointError); PyExc_FloatingPointError = NULL;
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Py_XDECREF(PyExc_IOError); PyExc_IOError = NULL;
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Py_XDECREF(PyExc_ImportError); PyExc_ImportError = NULL;
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Py_XDECREF(PyExc_IndexError); PyExc_IndexError = NULL;
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Py_XDECREF(PyExc_KeyError); PyExc_KeyError = NULL;
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Py_XDECREF(PyExc_KeyboardInterrupt); PyExc_KeyboardInterrupt = NULL;
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Py_XDECREF(PyExc_MemoryError); PyExc_MemoryError = NULL;
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Py_XDECREF(PyExc_NameError); PyExc_NameError = NULL;
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Py_XDECREF(PyExc_OverflowError); PyExc_OverflowError = NULL;
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Py_XDECREF(PyExc_RuntimeError); PyExc_RuntimeError = NULL;
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Py_XDECREF(PyExc_SyntaxError); PyExc_SyntaxError = NULL;
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Py_XDECREF(PyExc_SystemError); PyExc_SystemError = NULL;
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Py_XDECREF(PyExc_SystemExit); PyExc_SystemExit = NULL;
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Py_XDECREF(PyExc_TypeError); PyExc_TypeError = NULL;
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Py_XDECREF(PyExc_ValueError); PyExc_ValueError = NULL;
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Py_XDECREF(PyExc_ZeroDivisionError); PyExc_ZeroDivisionError = NULL;
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int i;
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for (i = 0; bltin_exc[i].name; i++) {
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PyObject *exc = *bltin_exc[i].exc;
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Py_XDECREF(exc);
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*bltin_exc[i].exc = NULL;
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}
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}
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PyObject *
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_PyBuiltin_Init()
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_PyBuiltin_Init_1()
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{
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PyObject *mod, *dict;
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mod = Py_InitModule("__builtin__", builtin_methods);
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@ -1823,11 +1933,29 @@ _PyBuiltin_Init()
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if (PyDict_SetItemString(dict, "__debug__",
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PyInt_FromLong(Py_OptimizeFlag == 0)) < 0)
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return NULL;
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return mod;
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}
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void
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_PyBuiltin_Fini()
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_PyBuiltin_Init_2(dict)
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PyObject *dict;
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{
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/* if Python was started with -X, initialize the class exceptions */
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if (Py_UseClassExceptionsFlag)
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init_class_exc(dict);
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}
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void
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_PyBuiltin_Fini_1()
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{
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fini_instances();
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}
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void
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_PyBuiltin_Fini_2()
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{
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finierrors();
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}
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