/* Traceback implementation */

#include "Python.h"

#include "code.h" // PyCode_Addr2Line etc

#include "pycore_interp.h" // PyInterpreterState.gc

#include "frameobject.h" // PyFrame_GetBack()

#include "pycore_frame.h" // _PyFrame_GetCode()

#include "pycore_pyarena.h" // _PyArena_Free()

#include "pycore_ast.h" // asdl_seq_*

#include "pycore_compile.h" // _PyAST_Optimize

#include "pycore_parser.h" // _PyParser_ASTFromString

#include "../Parser/pegen.h" // _PyPegen_byte_offset_to_character_offset()

#include "structmember.h" // PyMemberDef

#include "osdefs.h" // SEP

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#define OFF(x) offsetof(PyTracebackObject, x)

#define PUTS(fd, str) _Py_write_noraise(fd, str, (int)strlen(str))

#define MAX_STRING_LENGTH 500

#define MAX_FRAME_DEPTH 100

#define MAX_NTHREADS 100

/* Function from Parser/tokenizer.c */

extern char * PyTokenizer_FindEncodingFilename(int, PyObject *);

_Py_IDENTIFIER(TextIOWrapper);

_Py_IDENTIFIER(close);

_Py_IDENTIFIER(open);

_Py_IDENTIFIER(path);

/*[clinic input]

class TracebackType "PyTracebackObject *" "&PyTraceback_Type"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=928fa06c10151120]*/

#include "clinic/traceback.c.h"

static PyObject *

tb_create_raw(PyTracebackObject *next, PyFrameObject *frame, int lasti,

int lineno)

{

PyTracebackObject *tb;

if ((next != NULL && !PyTraceBack_Check(next)) ||

frame == NULL || !PyFrame_Check(frame)) {

PyErr_BadInternalCall();

return NULL;

}

tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);

if (tb != NULL) {

Py_XINCREF(next);

tb->tb_next = next;

Py_XINCREF(frame);

tb->tb_frame = frame;

tb->tb_lasti = lasti;

tb->tb_lineno = lineno;

PyObject_GC_Track(tb);

}

return (PyObject *)tb;

}

/*[clinic input]

@classmethod

TracebackType.__new__ as tb_new

tb_next: object

tb_frame: object(type='PyFrameObject *', subclass_of='&PyFrame_Type')

tb_lasti: int

tb_lineno: int

Create a new traceback object.

[clinic start generated code]*/

static PyObject *

tb_new_impl(PyTypeObject *type, PyObject *tb_next, PyFrameObject *tb_frame,

int tb_lasti, int tb_lineno)

/*[clinic end generated code: output=fa077debd72d861a input=01cbe8ec8783fca7]*/

{

if (tb_next == Py_None) {

tb_next = NULL;

} else if (!PyTraceBack_Check(tb_next)) {

return PyErr_Format(PyExc_TypeError,

"expected traceback object or None, got '%s'",

Py_TYPE(tb_next)->tp_name);

}

return tb_create_raw((PyTracebackObject *)tb_next, tb_frame, tb_lasti,

tb_lineno);

}

static PyObject *

tb_dir(PyTracebackObject *self, PyObject *Py_UNUSED(ignored))

{

return Py_BuildValue("[ssss]", "tb_frame", "tb_next",

"tb_lasti", "tb_lineno");

}

static PyObject *

tb_next_get(PyTracebackObject *self, void *Py_UNUSED(_))

{

PyObject* ret = (PyObject*)self->tb_next;

if (!ret) {

ret = Py_None;

}

Py_INCREF(ret);

return ret;

}

static int

tb_next_set(PyTracebackObject *self, PyObject *new_next, void *Py_UNUSED(_))

{

if (!new_next) {

PyErr_Format(PyExc_TypeError, "can't delete tb_next attribute");

return -1;

}

/* We accept None or a traceback object, and map None -> NULL (inverse of

tb_next_get) */

if (new_next == Py_None) {

new_next = NULL;

} else if (!PyTraceBack_Check(new_next)) {

PyErr_Format(PyExc_TypeError,

"expected traceback object, got '%s'",

Py_TYPE(new_next)->tp_name);

return -1;

}

/* Check for loops */

PyTracebackObject *cursor = (PyTracebackObject *)new_next;

while (cursor) {

if (cursor == self) {

PyErr_Format(PyExc_ValueError, "traceback loop detected");

return -1;

}

cursor = cursor->tb_next;

}

PyObject *old_next = (PyObject*)self->tb_next;

Py_XINCREF(new_next);

self->tb_next = (PyTracebackObject *)new_next;

Py_XDECREF(old_next);

return 0;

}

static PyMethodDef tb_methods[] = {

{"__dir__", (PyCFunction)tb_dir, METH_NOARGS},

{NULL, NULL, 0, NULL},

};

static PyMemberDef tb_memberlist[] = {

{"tb_frame", T_OBJECT, OFF(tb_frame), READONLY|PY_AUDIT_READ},

{"tb_lasti", T_INT, OFF(tb_lasti), READONLY},

{"tb_lineno", T_INT, OFF(tb_lineno), READONLY},

{NULL} /* Sentinel */

};

static PyGetSetDef tb_getsetters[] = {

{"tb_next", (getter)tb_next_get, (setter)tb_next_set, NULL, NULL},

{NULL} /* Sentinel */

};

static void

tb_dealloc(PyTracebackObject *tb)

{

PyObject_GC_UnTrack(tb);

Py_TRASHCAN_BEGIN(tb, tb_dealloc)

Py_XDECREF(tb->tb_next);

Py_XDECREF(tb->tb_frame);

PyObject_GC_Del(tb);

Py_TRASHCAN_END

}

static int

tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)

{

Py_VISIT(tb->tb_next);

Py_VISIT(tb->tb_frame);

return 0;

}

static int

tb_clear(PyTracebackObject *tb)

{

Py_CLEAR(tb->tb_next);

Py_CLEAR(tb->tb_frame);

return 0;

}

PyTypeObject PyTraceBack_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"traceback",

sizeof(PyTracebackObject),

0,

(destructor)tb_dealloc, /*tp_dealloc*/

0, /*tp_vectorcall_offset*/

0, /*tp_getattr*/

0, /*tp_setattr*/

0, /*tp_as_async*/

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 */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */

tb_new__doc__, /* tp_doc */

(traverseproc)tb_traverse, /* tp_traverse */

(inquiry)tb_clear, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

tb_methods, /* tp_methods */

tb_memberlist, /* tp_members */

tb_getsetters, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

tb_new, /* tp_new */

};

PyObject*

_PyTraceBack_FromFrame(PyObject *tb_next, PyFrameObject *frame)

{

assert(tb_next == NULL || PyTraceBack_Check(tb_next));

assert(frame != NULL);

return tb_create_raw((PyTracebackObject *)tb_next, frame, frame->f_frame->f_lasti*sizeof(_Py_CODEUNIT),

PyFrame_GetLineNumber(frame));

}

int

PyTraceBack_Here(PyFrameObject *frame)

{

PyObject *exc, *val, *tb, *newtb;

PyErr_Fetch(&exc, &val, &tb);

newtb = _PyTraceBack_FromFrame(tb, frame);

if (newtb == NULL) {

_PyErr_ChainExceptions(exc, val, tb);

return -1;

}

PyErr_Restore(exc, val, newtb);

Py_XDECREF(tb);

return 0;

}

/* Insert a frame into the traceback for (funcname, filename, lineno). */

void _PyTraceback_Add(const char *funcname, const char *filename, int lineno)

{

PyObject *globals;

PyCodeObject *code;

PyFrameObject *frame;

PyObject *exc, *val, *tb;

/* Save and clear the current exception. Python functions must not be

called with an exception set. Calling Python functions happens when

the codec of the filesystem encoding is implemented in pure Python. */

PyErr_Fetch(&exc, &val, &tb);

globals = PyDict_New();

if (!globals)

goto error;

code = PyCode_NewEmpty(filename, funcname, lineno);

if (!code) {

Py_DECREF(globals);

goto error;

}

frame = PyFrame_New(PyThreadState_Get(), code, globals, NULL);

Py_DECREF(globals);

Py_DECREF(code);

if (!frame)

goto error;

frame->f_lineno = lineno;

PyErr_Restore(exc, val, tb);

PyTraceBack_Here(frame);

Py_DECREF(frame);

return;

error:

_PyErr_ChainExceptions(exc, val, tb);

}

static PyObject *

_Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *io)

{

Py_ssize_t i;

PyObject *binary;

PyObject *v;

Py_ssize_t npath;

size_t taillen;

PyObject *syspath;

PyObject *path;

const char* tail;

PyObject *filebytes;

const char* filepath;

Py_ssize_t len;

PyObject* result;

filebytes = PyUnicode_EncodeFSDefault(filename);

if (filebytes == NULL) {

PyErr_Clear();

return NULL;

}

filepath = PyBytes_AS_STRING(filebytes);

/* Search tail of filename in sys.path before giving up */

tail = strrchr(filepath, SEP);

if (tail == NULL)

tail = filepath;

else

tail++;

taillen = strlen(tail);

syspath = _PySys_GetObjectId(&PyId_path);

if (syspath == NULL || !PyList_Check(syspath))

goto error;

npath = PyList_Size(syspath);

for (i = 0; i < npath; i++) {

v = PyList_GetItem(syspath, i);

if (v == NULL) {

PyErr_Clear();

break;

}

if (!PyUnicode_Check(v))

continue;

path = PyUnicode_EncodeFSDefault(v);

if (path == NULL) {

PyErr_Clear();

continue;

}

len = PyBytes_GET_SIZE(path);

if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1) {

Py_DECREF(path);

continue; /* Too long */

}

strcpy(namebuf, PyBytes_AS_STRING(path));

Py_DECREF(path);

if (strlen(namebuf) != (size_t)len)

continue; /* v contains '\0' */

if (len > 0 && namebuf[len-1] != SEP)

namebuf[len++] = SEP;

strcpy(namebuf+len, tail);

binary = _PyObject_CallMethodId(io, &PyId_open, "ss", namebuf, "rb");

if (binary != NULL) {

result = binary;

goto finally;

}

PyErr_Clear();

}

goto error;

error:

result = NULL;

finally:

Py_DECREF(filebytes);

return result;

}

int

_Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent, int *truncation, PyObject **line)

{

int err = 0;

int fd;

int i;

char *found_encoding;

const char *encoding;

PyObject *io;

PyObject *binary;

PyObject *fob = NULL;

PyObject *lineobj = NULL;

PyObject *res;

char buf[MAXPATHLEN+1];

int kind;

const void *data;

/* open the file */

if (filename == NULL)

return 0;

/* Do not attempt to open things like <string> or <stdin> */

assert(PyUnicode_Check(filename));

if (PyUnicode_READ_CHAR(filename, 0) == '<') {

Py_ssize_t len = PyUnicode_GET_LENGTH(filename);

if (len > 0 && PyUnicode_READ_CHAR(filename, len - 1) == '>') {

return 0;

}

}

io = PyImport_ImportModuleNoBlock("io");

if (io == NULL)

return -1;

binary = _PyObject_CallMethodId(io, &PyId_open, "Os", filename, "rb");

if (binary == NULL) {

PyErr_Clear();

binary = _Py_FindSourceFile(filename, buf, sizeof(buf), io);

if (binary == NULL) {

Py_DECREF(io);

return -1;

}

}

/* use the right encoding to decode the file as unicode */

fd = PyObject_AsFileDescriptor(binary);

if (fd < 0) {

Py_DECREF(io);

Py_DECREF(binary);

return 0;

}

found_encoding = PyTokenizer_FindEncodingFilename(fd, filename);

if (found_encoding == NULL)

PyErr_Clear();

encoding = (found_encoding != NULL) ? found_encoding : "utf-8";

/* Reset position */

if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {

Py_DECREF(io);

Py_DECREF(binary);

PyMem_Free(found_encoding);

return 0;

}

fob = _PyObject_CallMethodId(io, &PyId_TextIOWrapper, "Os", binary, encoding);

Py_DECREF(io);

PyMem_Free(found_encoding);

if (fob == NULL) {

PyErr_Clear();

res = _PyObject_CallMethodIdNoArgs(binary, &PyId_close);

Py_DECREF(binary);

if (res)

Py_DECREF(res);

else

PyErr_Clear();

return 0;

}

Py_DECREF(binary);

/* get the line number lineno */

for (i = 0; i < lineno; i++) {

Py_XDECREF(lineobj);

lineobj = PyFile_GetLine(fob, -1);

if (!lineobj) {

PyErr_Clear();

err = -1;

break;

}

}

res = _PyObject_CallMethodIdNoArgs(fob, &PyId_close);

if (res)

Py_DECREF(res);

else

PyErr_Clear();

Py_DECREF(fob);

if (!lineobj || !PyUnicode_Check(lineobj)) {

Py_XDECREF(lineobj);

return err;

}

if (line) {

Py_INCREF(lineobj);

*line = lineobj;

}

/* remove the indentation of the line */

kind = PyUnicode_KIND(lineobj);

data = PyUnicode_DATA(lineobj);

for (i=0; i < PyUnicode_GET_LENGTH(lineobj); i++) {

Py_UCS4 ch = PyUnicode_READ(kind, data, i);

if (ch != ' ' && ch != '\t' && ch != '\014')

break;

}

if (i) {

PyObject *truncated;

truncated = PyUnicode_Substring(lineobj, i, PyUnicode_GET_LENGTH(lineobj));

if (truncated) {

Py_DECREF(lineobj);

lineobj = truncated;

} else {

PyErr_Clear();

}

}

if (truncation != NULL) {

*truncation = i - indent;

}

/* Write some spaces before the line */

strcpy(buf, " ");

assert (strlen(buf) == 10);

while (indent > 0) {

if (indent < 10)

buf[indent] = '\0';

err = PyFile_WriteString(buf, f);

if (err != 0)

break;

indent -= 10;

}

/* finally display the line */

if (err == 0)

err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);

Py_DECREF(lineobj);

if (err == 0)

err = PyFile_WriteString("\n", f);

return err;

}

/* AST based Traceback Specialization

*

* When displaying a new traceback line, for certain syntactical constructs

* (e.g a subscript, an arithmetic operation) we try to create a representation

* that separates the primary source of error from the rest.

*

* Example specialization of BinOp nodes:

* Traceback (most recent call last):

* File "/home/isidentical/cpython/cpython/t.py", line 10, in <module>

* add_values(1, 2, 'x', 3, 4)

* ^^^^^^^^^^^^^^^^^^^^^^^^^^^

* File "/home/isidentical/cpython/cpython/t.py", line 2, in add_values

* return a + b + c + d + e

* ~~~~~~^~~

* TypeError: 'NoneType' object is not subscriptable

*/

#define IS_WHITESPACE(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\f'))

static int

extract_anchors_from_expr(const char *segment_str, expr_ty expr, Py_ssize_t *left_anchor, Py_ssize_t *right_anchor,

char** primary_error_char, char** secondary_error_char)

{

switch (expr->kind) {

case BinOp_kind: {

expr_ty left = expr->v.BinOp.left;

expr_ty right = expr->v.BinOp.right;

for (int i = left->end_col_offset; i < right->col_offset; i++) {

if (IS_WHITESPACE(segment_str[i])) {

continue;

}

*left_anchor = i;

*right_anchor = i + 1;

// Check whether if this a two-character operator (e.g //)

if (i + 1 < right->col_offset && !IS_WHITESPACE(segment_str[i + 1])) {

++*right_anchor;

}

// Set the error characters

*primary_error_char = "~";

*secondary_error_char = "^";

break;

}

return 1;

}

case Subscript_kind: {

*left_anchor = expr->v.Subscript.value->end_col_offset;

*right_anchor = expr->v.Subscript.slice->end_col_offset + 1;

// Set the error characters

*primary_error_char = "~";

*secondary_error_char = "^";

return 1;

}

default:

return 0;

}

}

static int

extract_anchors_from_stmt(const char *segment_str, stmt_ty statement, Py_ssize_t *left_anchor, Py_ssize_t *right_anchor,

char** primary_error_char, char** secondary_error_char)

{

switch (statement->kind) {

case Expr_kind: {

return extract_anchors_from_expr(segment_str, statement->v.Expr.value, left_anchor, right_anchor,

primary_error_char, secondary_error_char);

}

default:

return 0;

}

}

static int

extract_anchors_from_line(PyObject *filename, PyObject *line,

Py_ssize_t start_offset, Py_ssize_t end_offset,

Py_ssize_t *left_anchor, Py_ssize_t *right_anchor,

char** primary_error_char, char** secondary_error_char)

{

int res = -1;

PyArena *arena = NULL;

PyObject *segment = PyUnicode_Substring(line, start_offset, end_offset);

if (!segment) {

goto done;

}

const char *segment_str = PyUnicode_AsUTF8(segment);

if (!segment_str) {

goto done;

}

arena = _PyArena_New();

if (!arena) {

goto done;

}

PyCompilerFlags flags = _PyCompilerFlags_INIT;

_PyASTOptimizeState state;

state.optimize = _Py_GetConfig()->optimization_level;

state.ff_features = 0;

mod_ty module = _PyParser_ASTFromString(segment_str, filename, Py_file_input,

&flags, arena);

if (!module) {

goto done;

}

if (!_PyAST_Optimize(module, arena, &state)) {

goto done;

}

assert(module->kind == Module_kind);

if (asdl_seq_LEN(module->v.Module.body) == 1) {

stmt_ty statement = asdl_seq_GET(module->v.Module.body, 0);

res = extract_anchors_from_stmt(segment_str, statement, left_anchor, right_anchor,

primary_error_char, secondary_error_char);

} else {

res = 0;

}

done:

if (res > 0) {

*left_anchor += start_offset;

*right_anchor += start_offset;

}

Py_XDECREF(segment);

if (arena) {

_PyArena_Free(arena);

}

return res;

}

#define _TRACEBACK_SOURCE_LINE_INDENT 4

static inline int

ignore_source_errors(void) {

if (PyErr_Occurred()) {

if (PyErr_ExceptionMatches(PyExc_KeyboardInterrupt)) {

return -1;

}

PyErr_Clear();

}

return 0;

}

static inline int

print_error_location_carets(PyObject *f, int offset, Py_ssize_t start_offset, Py_ssize_t end_offset,

Py_ssize_t right_start_offset, Py_ssize_t left_end_offset,

const char *primary, const char *secondary) {

int err = 0;

int special_chars = (left_end_offset != -1 || right_start_offset != -1);

while (++offset <= end_offset) {

if (offset <= start_offset || offset > end_offset) {

err = PyFile_WriteString(" ", f);

} else if (special_chars && left_end_offset < offset && offset <= right_start_offset) {

err = PyFile_WriteString(secondary, f);

} else {

err = PyFile_WriteString(primary, f);

}

}

err = PyFile_WriteString("\n", f);

return err;

}

static int

tb_displayline(PyTracebackObject* tb, PyObject *f, PyObject *filename, int lineno,

PyFrameObject *frame, PyObject *name)

{

int err;

PyObject *line;

if (filename == NULL || name == NULL)

return -1;

line = PyUnicode_FromFormat(" File \"%U\", line %d, in %U\n",

filename, lineno, name);

if (line == NULL)

return -1;

err = PyFile_WriteObject(line, f, Py_PRINT_RAW);

Py_DECREF(line);

if (err != 0)

return err;

int truncation = _TRACEBACK_SOURCE_LINE_INDENT;

PyObject* source_line = NULL;

if (_Py_DisplaySourceLine(f, filename, lineno, _TRACEBACK_SOURCE_LINE_INDENT,

&truncation, &source_line) != 0 || !source_line) {

/* ignore errors since we can't report them, can we? */

err = ignore_source_errors();

goto done;

}

int code_offset = tb->tb_lasti;

PyCodeObject* code = frame->f_frame->f_code;

int start_line;

int end_line;

int start_col_byte_offset;

int end_col_byte_offset;

if (!PyCode_Addr2Location(code, code_offset, &start_line, &start_col_byte_offset,

&end_line, &end_col_byte_offset)) {

goto done;

}

if (start_line < 0 || end_line < 0

|| start_col_byte_offset < 0

|| end_col_byte_offset < 0)

{

goto done;

}

// When displaying errors, we will use the following generic structure:

//

// ERROR LINE ERROR LINE ERROR LINE ERROR LINE ERROR LINE ERROR LINE ERROR LINE

// ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^~~~~~~~~~~~~~~~~~~~

// | |-> left_end_offset | |-> left_offset

// |-> start_offset |-> right_start_offset

//

// In general we will only have (start_offset, end_offset) but we can gather more information

// by analyzing the AST of the text between *start_offset* and *end_offset*. If this succeeds

// we could get *left_end_offset* and *right_start_offset* and some selection of characters for

// the different ranges (primary_error_char and secondary_error_char). If we cannot obtain the

// AST information or we cannot identify special ranges within it, then left_end_offset and

// right_end_offset will be set to -1.

// Convert the utf-8 byte offset to the actual character offset so we print the right number of carets.

assert(source_line);

Py_ssize_t start_offset = _PyPegen_byte_offset_to_character_offset(source_line, start_col_byte_offset);

if (start_offset < 0) {

err = ignore_source_errors() < 0;

goto done;

}

Py_ssize_t end_offset = _PyPegen_byte_offset_to_character_offset(source_line, end_col_byte_offset);

if (end_offset < 0) {

err = ignore_source_errors() < 0;

goto done;

}

Py_ssize_t left_end_offset = -1;

Py_ssize_t right_start_offset = -1;

char *primary_error_char = "^";

char *secondary_error_char = primary_error_char;

if (start_line == end_line) {

int res = extract_anchors_from_line(filename, source_line, start_offset, end_offset,

&left_end_offset, &right_start_offset,

&primary_error_char, &secondary_error_char);

if (res < 0 && ignore_source_errors() < 0) {

goto done;

}

}

else {

// If this is a multi-line expression, then we will highlight until

// the last non-whitespace character.

const char *source_line_str = PyUnicode_AsUTF8(source_line);

if (!source_line_str) {

goto done;

}

Py_ssize_t i = PyUnicode_GET_LENGTH(source_line);

while (--i >= 0) {

if (!IS_WHITESPACE(source_line_str[i])) {

break;

}

}

end_offset = i + 1;

}

err = print_error_location_carets(f, truncation, start_offset, end_offset,

right_start_offset, left_end_offset,

primary_error_char, secondary_error_char);

done:

Py_XDECREF(source_line);

return err;

}

static const int TB_RECURSIVE_CUTOFF = 3; // Also hardcoded in traceback.py.

static int

tb_print_line_repeated(PyObject *f, long cnt)

{

cnt -= TB_RECURSIVE_CUTOFF;

PyObject *line = PyUnicode_FromFormat(

(cnt > 1)

? " [Previous line repeated %ld more times]\n"

: " [Previous line repeated %ld more time]\n",

cnt);

if (line == NULL) {

return -1;

}

int err = PyFile_WriteObject(line, f, Py_PRINT_RAW);

Py_DECREF(line);

return err;

}

static int

tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)

{

int err = 0;

Py_ssize_t depth = 0;

PyObject *last_file = NULL;

int last_line = -1;

PyObject *last_name = NULL;

long cnt = 0;

PyTracebackObject *tb1 = tb;

while (tb1 != NULL) {

depth++;

tb1 = tb1->tb_next;

}

while (tb != NULL && depth > limit) {

depth--;

tb = tb->tb_next;

}

while (tb != NULL && err == 0) {

PyCodeObject *code = PyFrame_GetCode(tb->tb_frame);

if (last_file == NULL ||

code->co_filename != last_file ||

last_line == -1 || tb->tb_lineno != last_line ||

last_name == NULL || code->co_name != last_name) {

if (cnt > TB_RECURSIVE_CUTOFF) {

err = tb_print_line_repeated(f, cnt);

}

last_file = code->co_filename;

last_line = tb->tb_lineno;

last_name = code->co_name;

cnt = 0;

}

cnt++;

if (err == 0 && cnt <= TB_RECURSIVE_CUTOFF) {

err = tb_displayline(tb, f, code->co_filename, tb->tb_lineno,

tb->tb_frame, code->co_name);

if (err == 0) {

err = PyErr_CheckSignals();

}

}

Py_DECREF(code);

tb = tb->tb_next;

}

if (err == 0 && cnt > TB_RECURSIVE_CUTOFF) {

err = tb_print_line_repeated(f, cnt);

}

return err;

}

#define PyTraceBack_LIMIT 1000

int

PyTraceBack_Print(PyObject *v, PyObject *f)

{

int err;

PyObject *limitv;

long limit = PyTraceBack_LIMIT;

if (v == NULL)

return 0;

if (!PyTraceBack_Check(v)) {

PyErr_BadInternalCall();

return -1;

}

limitv = PySys_GetObject("tracebacklimit");

if (limitv && PyLong_Check(limitv)) {

int overflow;

limit = PyLong_AsLongAndOverflow(limitv, &overflow);

if (overflow > 0) {

limit = LONG_MAX;

}

else if (limit <= 0) {

return 0;

}

}

err = PyFile_WriteString("Traceback (most recent call last):\n", f);

if (!err)

err = tb_printinternal((PyTracebackObject *)v, f, limit);

return err;

}

/* Format an integer in range [0; 0xffffffff] to decimal and write it

into the file fd.

This function is signal safe. */

void

_Py_DumpDecimal(int fd, size_t value)

{

/* maximum number of characters required for output of %lld or %p.

We need at most ceil(log10(256)*SIZEOF_LONG_LONG) digits,

plus 1 for the null byte. 53/22 is an upper bound for log10(256). */

char buffer[1 + (sizeof(size_t)*53-1) / 22 + 1];

char *ptr, *end;

end = &buffer[Py_ARRAY_LENGTH(buffer) - 1];

ptr = end;

*ptr = '\0';

do {

--ptr;

assert(ptr >= buffer);

*ptr = '0' + (value % 10);

value /= 10;

} while (value);

_Py_write_noraise(fd, ptr, end - ptr);

}

/* Format an integer as hexadecimal with width digits into fd file descriptor.

The function is signal safe. */

void

_Py_DumpHexadecimal(int fd, uintptr_t value, Py_ssize_t width)

{

char buffer[sizeof(uintptr_t) * 2 + 1], *ptr, *end;

const Py_ssize_t size = Py_ARRAY_LENGTH(buffer) - 1;

if (width > size)

width = size;

/* it's ok if width is negative */

end = &buffer[size];

ptr = end;

*ptr = '\0';

do {

--ptr;

assert(ptr >= buffer);

*ptr = Py_hexdigits[value & 15];

value >>= 4;

} while ((end - ptr) < width || value);

_Py_write_noraise(fd, ptr, end - ptr);

}

void

_Py_DumpASCII(int fd, PyObject *text)

{

PyASCIIObject *ascii = (PyASCIIObject *)text;

Py_ssize_t i, size;

int truncated;

int kind;

void *data = NULL;

wchar_t *wstr = NULL;

Py_UCS4 ch;

if (!PyUnicode_Check(text))

return;

size = ascii->length;

kind = ascii->state.kind;

if (kind == PyUnicode_WCHAR_KIND) {

wstr = ((PyASCIIObject *)text)->wstr;

if (wstr == NULL)

return;

size = ((PyCompactUnicodeObject *)text)->wstr_length;

}

else if (ascii->state.compact) {

if (ascii->state.ascii)

data = ((PyASCIIObject*)text) + 1;

else

data = ((PyCompactUnicodeObject*)text) + 1;

}

else {

data = ((PyUnicodeObject *)text)->data.any;

if (data == NULL)

return;

}

if (MAX_STRING_LENGTH < size) {

size = MAX_STRING_LENGTH;

truncated = 1;

}

else {

truncated = 0;