mirror of
https://github.com/python/cpython.git
synced 2024-11-28 08:20:55 +01:00
405 lines
11 KiB
C
405 lines
11 KiB
C
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/* Traceback implementation */
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#include "Python.h"
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#include "code.h"
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#include "frameobject.h"
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#include "structmember.h"
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#include "osdefs.h"
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#define OFF(x) offsetof(PyTracebackObject, x)
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/* Method from Parser/tokenizer.c */
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extern char * PyTokenizer_FindEncoding(int);
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static PyObject *
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tb_dir(PyTracebackObject *self)
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{
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return Py_BuildValue("[ssss]", "tb_frame", "tb_next",
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"tb_lasti", "tb_lineno");
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}
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static PyMethodDef tb_methods[] = {
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{"__dir__", (PyCFunction)tb_dir, METH_NOARGS},
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{NULL, NULL, 0, NULL},
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};
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static PyMemberDef tb_memberlist[] = {
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{"tb_next", T_OBJECT, OFF(tb_next), READONLY},
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{"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
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{"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
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{"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
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{NULL} /* Sentinel */
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};
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static void
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tb_dealloc(PyTracebackObject *tb)
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{
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PyObject_GC_UnTrack(tb);
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Py_TRASHCAN_SAFE_BEGIN(tb)
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Py_XDECREF(tb->tb_next);
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Py_XDECREF(tb->tb_frame);
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PyObject_GC_Del(tb);
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Py_TRASHCAN_SAFE_END(tb)
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}
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static int
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tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
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{
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Py_VISIT(tb->tb_next);
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Py_VISIT(tb->tb_frame);
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return 0;
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}
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static void
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tb_clear(PyTracebackObject *tb)
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{
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Py_CLEAR(tb->tb_next);
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Py_CLEAR(tb->tb_frame);
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}
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PyTypeObject PyTraceBack_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"traceback",
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sizeof(PyTracebackObject),
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0,
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(destructor)tb_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_reserved*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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0, /* tp_doc */
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(traverseproc)tb_traverse, /* tp_traverse */
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(inquiry)tb_clear, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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tb_methods, /* tp_methods */
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tb_memberlist, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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};
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static PyTracebackObject *
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newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
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{
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PyTracebackObject *tb;
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if ((next != NULL && !PyTraceBack_Check(next)) ||
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frame == NULL || !PyFrame_Check(frame)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
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if (tb != NULL) {
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Py_XINCREF(next);
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tb->tb_next = next;
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Py_XINCREF(frame);
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tb->tb_frame = frame;
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tb->tb_lasti = frame->f_lasti;
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tb->tb_lineno = PyFrame_GetLineNumber(frame);
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PyObject_GC_Track(tb);
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}
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return tb;
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}
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int
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PyTraceBack_Here(PyFrameObject *frame)
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{
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PyThreadState *tstate = PyThreadState_GET();
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PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
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PyTracebackObject *tb = newtracebackobject(oldtb, frame);
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if (tb == NULL)
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return -1;
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tstate->curexc_traceback = (PyObject *)tb;
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Py_XDECREF(oldtb);
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return 0;
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}
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static PyObject *
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_Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *io)
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{
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Py_ssize_t i;
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PyObject *binary;
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PyObject *v;
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Py_ssize_t npath;
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size_t taillen;
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PyObject *syspath;
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PyObject *path;
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const char* tail;
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PyObject *filebytes;
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const char* filepath;
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Py_ssize_t len;
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PyObject* result;
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filebytes = PyUnicode_EncodeFSDefault(filename);
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if (filebytes == NULL) {
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PyErr_Clear();
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return NULL;
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}
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filepath = PyBytes_AS_STRING(filebytes);
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/* Search tail of filename in sys.path before giving up */
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tail = strrchr(filepath, SEP);
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if (tail == NULL)
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tail = filepath;
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else
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tail++;
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taillen = strlen(tail);
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syspath = PySys_GetObject("path");
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if (syspath == NULL || !PyList_Check(syspath))
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goto error;
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npath = PyList_Size(syspath);
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for (i = 0; i < npath; i++) {
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v = PyList_GetItem(syspath, i);
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if (v == NULL) {
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PyErr_Clear();
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break;
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}
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if (!PyUnicode_Check(v))
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continue;
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path = PyUnicode_EncodeFSDefault(v);
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if (path == NULL) {
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PyErr_Clear();
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continue;
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}
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len = PyBytes_GET_SIZE(path);
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if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1) {
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Py_DECREF(path);
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continue; /* Too long */
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}
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strcpy(namebuf, PyBytes_AS_STRING(path));
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Py_DECREF(path);
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if (strlen(namebuf) != len)
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continue; /* v contains '\0' */
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if (len > 0 && namebuf[len-1] != SEP)
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namebuf[len++] = SEP;
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strcpy(namebuf+len, tail);
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binary = PyObject_CallMethod(io, "open", "ss", namebuf, "rb");
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if (binary != NULL) {
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result = binary;
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goto finally;
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}
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PyErr_Clear();
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}
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goto error;
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error:
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result = NULL;
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finally:
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Py_DECREF(filebytes);
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return result;
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}
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int
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_Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
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{
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int err = 0;
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int fd;
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int i;
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char *found_encoding;
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char *encoding;
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PyObject *io;
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PyObject *binary;
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PyObject *fob = NULL;
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PyObject *lineobj = NULL;
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PyObject *res;
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char buf[MAXPATHLEN+1];
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Py_UNICODE *u, *p;
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Py_ssize_t len;
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/* open the file */
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if (filename == NULL)
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return 0;
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io = PyImport_ImportModuleNoBlock("io");
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if (io == NULL)
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return -1;
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binary = PyObject_CallMethod(io, "open", "Os", filename, "rb");
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if (binary == NULL) {
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binary = _Py_FindSourceFile(filename, buf, sizeof(buf), io);
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if (binary == NULL) {
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Py_DECREF(io);
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return 0;
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}
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}
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/* use the right encoding to decode the file as unicode */
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fd = PyObject_AsFileDescriptor(binary);
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found_encoding = PyTokenizer_FindEncoding(fd);
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encoding = (found_encoding != NULL) ? found_encoding : "utf-8";
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lseek(fd, 0, 0); /* Reset position */
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fob = PyObject_CallMethod(io, "TextIOWrapper", "Os", binary, encoding);
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Py_DECREF(io);
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Py_DECREF(binary);
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PyMem_FREE(found_encoding);
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if (fob == NULL) {
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PyErr_Clear();
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return 0;
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}
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/* get the line number lineno */
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for (i = 0; i < lineno; i++) {
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Py_XDECREF(lineobj);
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lineobj = PyFile_GetLine(fob, -1);
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if (!lineobj) {
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err = -1;
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break;
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}
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}
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res = PyObject_CallMethod(fob, "close", "");
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if (res)
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Py_DECREF(res);
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else
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PyErr_Clear();
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Py_DECREF(fob);
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if (!lineobj || !PyUnicode_Check(lineobj)) {
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Py_XDECREF(lineobj);
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return err;
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}
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/* remove the indentation of the line */
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u = PyUnicode_AS_UNICODE(lineobj);
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len = PyUnicode_GET_SIZE(lineobj);
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for (p=u; *p == ' ' || *p == '\t' || *p == '\014'; p++)
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len--;
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if (u != p) {
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PyObject *truncated;
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truncated = PyUnicode_FromUnicode(p, len);
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if (truncated) {
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Py_DECREF(lineobj);
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lineobj = truncated;
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} else {
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PyErr_Clear();
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}
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}
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/* Write some spaces before the line */
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strcpy(buf, " ");
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assert (strlen(buf) == 10);
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while (indent > 0) {
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if(indent < 10)
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buf[indent] = '\0';
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err = PyFile_WriteString(buf, f);
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if (err != 0)
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break;
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indent -= 10;
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}
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/* finally display the line */
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if (err == 0)
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err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);
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Py_DECREF(lineobj);
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if (err == 0)
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err = PyFile_WriteString("\n", f);
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return err;
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}
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static int
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tb_displayline(PyObject *f, PyObject *filename, int lineno, PyObject *name)
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{
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int err;
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PyObject *line;
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if (filename == NULL || name == NULL)
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return -1;
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line = PyUnicode_FromFormat(" File \"%U\", line %d, in %U\n",
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filename, lineno, name);
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if (line == NULL)
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return -1;
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err = PyFile_WriteObject(line, f, Py_PRINT_RAW);
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Py_DECREF(line);
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if (err != 0)
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return err;
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return _Py_DisplaySourceLine(f, filename, lineno, 4);
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}
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static int
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tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
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{
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int err = 0;
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long depth = 0;
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PyTracebackObject *tb1 = tb;
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while (tb1 != NULL) {
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depth++;
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tb1 = tb1->tb_next;
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}
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while (tb != NULL && err == 0) {
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if (depth <= limit) {
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err = tb_displayline(f,
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tb->tb_frame->f_code->co_filename,
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tb->tb_lineno,
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tb->tb_frame->f_code->co_name);
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}
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depth--;
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tb = tb->tb_next;
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if (err == 0)
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err = PyErr_CheckSignals();
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}
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return err;
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}
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#define PyTraceBack_LIMIT 1000
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int
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PyTraceBack_Print(PyObject *v, PyObject *f)
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{
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int err;
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PyObject *limitv;
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long limit = PyTraceBack_LIMIT;
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if (v == NULL)
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return 0;
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if (!PyTraceBack_Check(v)) {
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PyErr_BadInternalCall();
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return -1;
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}
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limitv = PySys_GetObject("tracebacklimit");
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if (limitv) {
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PyObject *exc_type, *exc_value, *exc_tb;
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PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
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limit = PyLong_AsLong(limitv);
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if (limit == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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limit = PyTraceBack_LIMIT;
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}
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else {
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Py_XDECREF(exc_type);
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Py_XDECREF(exc_value);
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Py_XDECREF(exc_tb);
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return 0;
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}
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}
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else if (limit <= 0) {
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limit = PyTraceBack_LIMIT;
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}
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PyErr_Restore(exc_type, exc_value, exc_tb);
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}
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err = PyFile_WriteString("Traceback (most recent call last):\n", f);
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if (!err)
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err = tb_printinternal((PyTracebackObject *)v, f, limit);
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return err;
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}
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