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https://github.com/python/cpython.git
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275 lines
6.7 KiB
C
275 lines
6.7 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Traceback implementation */
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#include "Python.h"
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#include "compile.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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typedef struct _tracebackobject {
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PyObject_HEAD
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struct _tracebackobject *tb_next;
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PyFrameObject *tb_frame;
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int tb_lasti;
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int tb_lineno;
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} tracebackobject;
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#define OFF(x) offsetof(tracebackobject, x)
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static struct memberlist tb_memberlist[] = {
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{"tb_next", T_OBJECT, OFF(tb_next)},
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{"tb_frame", T_OBJECT, OFF(tb_frame)},
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{"tb_lasti", T_INT, OFF(tb_lasti)},
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{"tb_lineno", T_INT, OFF(tb_lineno)},
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{NULL} /* Sentinel */
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};
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static PyObject *
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tb_getattr(tb, name)
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tracebackobject *tb;
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char *name;
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{
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return PyMember_Get((char *)tb, tb_memberlist, name);
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}
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static void
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tb_dealloc(tb)
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tracebackobject *tb;
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{
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Py_XDECREF(tb->tb_next);
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Py_XDECREF(tb->tb_frame);
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PyMem_DEL(tb);
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}
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#define Tracebacktype PyTraceBack_Type
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#define is_tracebackobject PyTraceBack_Check
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PyTypeObject Tracebacktype = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"traceback",
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sizeof(tracebackobject),
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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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(getattrfunc)tb_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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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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};
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static tracebackobject *
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newtracebackobject(next, frame, lasti, lineno)
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tracebackobject *next;
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PyFrameObject *frame;
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int lasti, lineno;
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{
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tracebackobject *tb;
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if ((next != NULL && !is_tracebackobject(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_NEW(tracebackobject, &Tracebacktype);
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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 = lasti;
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tb->tb_lineno = lineno;
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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(frame)
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PyFrameObject *frame;
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{
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PyThreadState *tstate = frame->f_tstate;
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tracebackobject *oldtb = (tracebackobject *) tstate->curexc_traceback;
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tracebackobject *tb = newtracebackobject(oldtb,
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frame, frame->f_lasti, frame->f_lineno);
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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 int
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tb_displayline(f, filename, lineno, name)
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PyObject *f;
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char *filename;
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int lineno;
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char *name;
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{
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int err = 0;
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FILE *xfp;
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char linebuf[1000];
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int i;
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if (filename == NULL || name == NULL)
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return -1;
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#ifdef MPW
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/* This is needed by MPW's File and Line commands */
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#define FMT " File \"%.900s\"; line %d # in %s\n"
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#else
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/* This is needed by Emacs' compile command */
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#define FMT " File \"%.900s\", line %d, in %s\n"
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#endif
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xfp = fopen(filename, "r");
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if (xfp == NULL) {
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/* Search tail of filename in sys.path before giving up */
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PyObject *path;
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char *tail = strrchr(filename, SEP);
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if (tail == NULL)
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tail = filename;
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else
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tail++;
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path = PySys_GetObject("path");
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if (path != NULL && PyList_Check(path)) {
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int npath = PyList_Size(path);
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int taillen = strlen(tail);
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char namebuf[MAXPATHLEN+1];
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for (i = 0; i < npath; i++) {
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PyObject *v = PyList_GetItem(path, 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 (PyString_Check(v)) {
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int len;
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len = PyString_Size(v);
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if (len + 1 + taillen >= MAXPATHLEN)
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continue; /* Too long */
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strcpy(namebuf, PyString_AsString(v));
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if ((int)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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xfp = fopen(namebuf, "r");
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if (xfp != NULL) {
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filename = namebuf;
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break;
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}
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}
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}
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}
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}
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sprintf(linebuf, FMT, filename, lineno, name);
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err = PyFile_WriteString(linebuf, f);
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if (xfp == NULL || err != 0)
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return err;
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for (i = 0; i < lineno; i++) {
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if (fgets(linebuf, sizeof linebuf, xfp) == NULL)
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break;
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}
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if (i == lineno) {
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char *p = linebuf;
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while (*p == ' ' || *p == '\t' || *p == '\014')
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p++;
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err = PyFile_WriteString(" ", f);
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if (err == 0) {
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err = PyFile_WriteString(p, f);
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if (err == 0 && strchr(p, '\n') == NULL)
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err = PyFile_WriteString("\n", f);
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}
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}
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fclose(xfp);
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return err;
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}
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static int
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tb_printinternal(tb, f, limit)
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tracebackobject *tb;
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PyObject *f;
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int limit;
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{
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int err = 0;
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int depth = 0;
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tracebackobject *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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if (Py_OptimizeFlag)
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tb->tb_lineno = PyCode_Addr2Line(
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tb->tb_frame->f_code, tb->tb_lasti);
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err = tb_displayline(f,
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PyString_AsString(
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tb->tb_frame->f_code->co_filename),
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tb->tb_lineno,
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PyString_AsString(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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int
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PyTraceBack_Print(v, f)
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PyObject *v;
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PyObject *f;
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{
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int err;
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PyObject *limitv;
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int limit = 1000;
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if (v == NULL)
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return 0;
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if (!is_tracebackobject(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 && PyInt_Check(limitv)) {
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limit = PyInt_AsLong(limitv);
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if (limit <= 0)
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return 0;
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}
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err = PyFile_WriteString("Traceback (innermost last):\n", f);
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if (!err)
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err = tb_printinternal((tracebackobject *)v, f, limit);
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return err;
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}
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