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pythonrun.c
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/* Top level execution of Python code (including in __main__) */
/* To help control the interfaces between the startup, execution and
* shutdown code, the phases are split across separate modules (bootstrap,
* pythonrun, shutdown)
*/
/* TODO: Cull includes following phase split */
#include <stdbool.h>
#include "Python.h"
#include "pycore_ast.h" // PyAST_mod2obj
#include "pycore_ceval.h" // _Py_EnterRecursiveCall
#include "pycore_compile.h" // _PyAST_Compile()
#include "pycore_interp.h" // PyInterpreterState.importlib
#include "pycore_object.h" // _PyDebug_PrintTotalRefs()
#include "pycore_parser.h" // _PyParser_ASTFromString()
#include "pycore_pyerrors.h" // _PyErr_Fetch, _Py_Offer_Suggestions
#include "pycore_pylifecycle.h" // _Py_UnhandledKeyboardInterrupt
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_sysmodule.h" // _PySys_Audit()
#include "pycore_traceback.h" // _PyTraceBack_Print_Indented()
#include "errcode.h" // E_EOF
#include "marshal.h" // PyMarshal_ReadLongFromFile()
#ifdef MS_WINDOWS
# include "malloc.h" // alloca()
#endif
#ifdef MS_WINDOWS
# undef BYTE
# include "windows.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* Forward */
static void flush_io(void);
static PyObject *run_mod(mod_ty, PyObject *, PyObject *, PyObject *,
PyCompilerFlags *, PyArena *);
static PyObject *run_pyc_file(FILE *, PyObject *, PyObject *,
PyCompilerFlags *);
static int PyRun_InteractiveOneObjectEx(FILE *, PyObject *, PyCompilerFlags *);
static PyObject* pyrun_file(FILE *fp, PyObject *filename, int start,
PyObject *globals, PyObject *locals, int closeit,
PyCompilerFlags *flags);
int
_PyRun_AnyFileObject(FILE *fp, PyObject *filename, int closeit,
PyCompilerFlags *flags)
{
int decref_filename = 0;
if (filename == NULL) {
filename = PyUnicode_FromString("???");
if (filename == NULL) {
PyErr_Print();
return -1;
}
decref_filename = 1;
}
int res;
if (_Py_FdIsInteractive(fp, filename)) {
res = _PyRun_InteractiveLoopObject(fp, filename, flags);
if (closeit) {
fclose(fp);
}
}
else {
res = _PyRun_SimpleFileObject(fp, filename, closeit, flags);
}
if (decref_filename) {
Py_DECREF(filename);
}
return res;
}
/* Parse input from a file and execute it */
int
PyRun_AnyFileExFlags(FILE *fp, const char *filename, int closeit,
PyCompilerFlags *flags)
{
PyObject *filename_obj;
if (filename != NULL) {
filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL) {
PyErr_Print();
return -1;
}
}
else {
filename_obj = NULL;
}
int res = _PyRun_AnyFileObject(fp, filename_obj, closeit, flags);
Py_XDECREF(filename_obj);
return res;
}
int
_PyRun_InteractiveLoopObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)
{
PyCompilerFlags local_flags = _PyCompilerFlags_INIT;
if (flags == NULL) {
flags = &local_flags;
}
PyThreadState *tstate = _PyThreadState_GET();
PyObject *v = _PySys_GetAttr(tstate, &_Py_ID(ps1));
if (v == NULL) {
_PySys_SetAttr(&_Py_ID(ps1), v = PyUnicode_FromString(">>> "));
Py_XDECREF(v);
}
v = _PySys_GetAttr(tstate, &_Py_ID(ps2));
if (v == NULL) {
_PySys_SetAttr(&_Py_ID(ps2), v = PyUnicode_FromString("... "));
Py_XDECREF(v);
}
#ifdef Py_REF_DEBUG
int show_ref_count = _Py_GetConfig()->show_ref_count;
#endif
int err = 0;
int ret;
int nomem_count = 0;
do {
ret = PyRun_InteractiveOneObjectEx(fp, filename, flags);
if (ret == -1 && PyErr_Occurred()) {
/* Prevent an endless loop after multiple consecutive MemoryErrors
* while still allowing an interactive command to fail with a
* MemoryError. */
if (PyErr_ExceptionMatches(PyExc_MemoryError)) {
if (++nomem_count > 16) {
PyErr_Clear();
err = -1;
break;
}
} else {
nomem_count = 0;
}
PyErr_Print();
flush_io();
} else {
nomem_count = 0;
}
#ifdef Py_REF_DEBUG
if (show_ref_count) {
_PyDebug_PrintTotalRefs();
}
#endif
} while (ret != E_EOF);
return err;
}
int
PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)
{
PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL) {
PyErr_Print();
return -1;
}
int err = _PyRun_InteractiveLoopObject(fp, filename_obj, flags);
Py_DECREF(filename_obj);
return err;
}
/* A PyRun_InteractiveOneObject() auxiliary function that does not print the
* error on failure. */
static int
PyRun_InteractiveOneObjectEx(FILE *fp, PyObject *filename,
PyCompilerFlags *flags)
{
PyObject *m, *d, *v, *w, *oenc = NULL;
mod_ty mod;
PyArena *arena;
const char *ps1 = "", *ps2 = "", *enc = NULL;
int errcode = 0;
PyThreadState *tstate = _PyThreadState_GET();
if (fp == stdin) {
/* Fetch encoding from sys.stdin if possible. */
v = _PySys_GetAttr(tstate, &_Py_ID(stdin));
if (v && v != Py_None) {
oenc = PyObject_GetAttr(v, &_Py_ID(encoding));
if (oenc)
enc = PyUnicode_AsUTF8(oenc);
if (!enc)
PyErr_Clear();
}
}
v = _PySys_GetAttr(tstate, &_Py_ID(ps1));
if (v != NULL) {
v = PyObject_Str(v);
if (v == NULL)
PyErr_Clear();
else if (PyUnicode_Check(v)) {
ps1 = PyUnicode_AsUTF8(v);
if (ps1 == NULL) {
PyErr_Clear();
ps1 = "";
}
}
}
w = _PySys_GetAttr(tstate, &_Py_ID(ps2));
if (w != NULL) {
w = PyObject_Str(w);
if (w == NULL)
PyErr_Clear();
else if (PyUnicode_Check(w)) {
ps2 = PyUnicode_AsUTF8(w);
if (ps2 == NULL) {
PyErr_Clear();
ps2 = "";
}
}
}
arena = _PyArena_New();
if (arena == NULL) {
Py_XDECREF(v);
Py_XDECREF(w);
Py_XDECREF(oenc);
return -1;
}
mod = _PyParser_ASTFromFile(fp, filename, enc, Py_single_input,
ps1, ps2, flags, &errcode, arena);
Py_XDECREF(v);
Py_XDECREF(w);
Py_XDECREF(oenc);
if (mod == NULL) {
_PyArena_Free(arena);
if (errcode == E_EOF) {
PyErr_Clear();
return E_EOF;
}
return -1;
}
m = PyImport_AddModuleObject(&_Py_ID(__main__));
if (m == NULL) {
_PyArena_Free(arena);
return -1;
}
d = PyModule_GetDict(m);
v = run_mod(mod, filename, d, d, flags, arena);
_PyArena_Free(arena);
if (v == NULL) {
return -1;
}
Py_DECREF(v);
flush_io();
return 0;
}
int
PyRun_InteractiveOneObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)
{
int res;
res = PyRun_InteractiveOneObjectEx(fp, filename, flags);
if (res == -1) {
PyErr_Print();
flush_io();
}
return res;
}
int
PyRun_InteractiveOneFlags(FILE *fp, const char *filename_str, PyCompilerFlags *flags)
{
PyObject *filename;
int res;
filename = PyUnicode_DecodeFSDefault(filename_str);
if (filename == NULL) {
PyErr_Print();
return -1;
}
res = PyRun_InteractiveOneObject(fp, filename, flags);
Py_DECREF(filename);
return res;
}
/* Check whether a file maybe a pyc file: Look at the extension,
the file type, and, if we may close it, at the first few bytes. */
static int
maybe_pyc_file(FILE *fp, PyObject *filename, int closeit)
{
PyObject *ext = PyUnicode_FromString(".pyc");
if (ext == NULL) {
return -1;
}
Py_ssize_t endswith = PyUnicode_Tailmatch(filename, ext, 0, PY_SSIZE_T_MAX, +1);
Py_DECREF(ext);
if (endswith) {
return 1;
}
/* Only look into the file if we are allowed to close it, since
it then should also be seekable. */
if (!closeit) {
return 0;
}
/* Read only two bytes of the magic. If the file was opened in
text mode, the bytes 3 and 4 of the magic (\r\n) might not
be read as they are on disk. */
unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF;
unsigned char buf[2];
/* Mess: In case of -x, the stream is NOT at its start now,
and ungetc() was used to push back the first newline,
which makes the current stream position formally undefined,
and a x-platform nightmare.
Unfortunately, we have no direct way to know whether -x
was specified. So we use a terrible hack: if the current
stream position is not 0, we assume -x was specified, and
give up. Bug 132850 on SourceForge spells out the
hopelessness of trying anything else (fseek and ftell
don't work predictably x-platform for text-mode files).
*/
int ispyc = 0;
if (ftell(fp) == 0) {
if (fread(buf, 1, 2, fp) == 2 &&
((unsigned int)buf[1]<<8 | buf[0]) == halfmagic)
ispyc = 1;
rewind(fp);
}
return ispyc;
}
static int
set_main_loader(PyObject *d, PyObject *filename, const char *loader_name)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
PyObject *bootstrap = PyObject_GetAttrString(interp->importlib,
"_bootstrap_external");
if (bootstrap == NULL) {
return -1;
}
PyObject *loader_type = PyObject_GetAttrString(bootstrap, loader_name);
Py_DECREF(bootstrap);
if (loader_type == NULL) {
return -1;
}
PyObject *loader = PyObject_CallFunction(loader_type,
"sO", "__main__", filename);
Py_DECREF(loader_type);
if (loader == NULL) {
return -1;
}
if (PyDict_SetItemString(d, "__loader__", loader) < 0) {
Py_DECREF(loader);
return -1;
}
Py_DECREF(loader);
return 0;
}
int
_PyRun_SimpleFileObject(FILE *fp, PyObject *filename, int closeit,
PyCompilerFlags *flags)
{
PyObject *m, *d, *v;
int set_file_name = 0, ret = -1;
m = PyImport_AddModule("__main__");
if (m == NULL)
return -1;
Py_INCREF(m);
d = PyModule_GetDict(m);
if (_PyDict_GetItemStringWithError(d, "__file__") == NULL) {
if (PyErr_Occurred()) {
goto done;
}
if (PyDict_SetItemString(d, "__file__", filename) < 0) {
goto done;
}
if (PyDict_SetItemString(d, "__cached__", Py_None) < 0) {
goto done;
}
set_file_name = 1;
}
int pyc = maybe_pyc_file(fp, filename, closeit);
if (pyc < 0) {
goto done;
}
if (pyc) {
FILE *pyc_fp;
/* Try to run a pyc file. First, re-open in binary */
if (closeit) {
fclose(fp);
}
pyc_fp = _Py_fopen_obj(filename, "rb");
if (pyc_fp == NULL) {
fprintf(stderr, "python: Can't reopen .pyc file\n");
goto done;
}
if (set_main_loader(d, filename, "SourcelessFileLoader") < 0) {
fprintf(stderr, "python: failed to set __main__.__loader__\n");
ret = -1;
fclose(pyc_fp);
goto done;
}
v = run_pyc_file(pyc_fp, d, d, flags);
} else {
/* When running from stdin, leave __main__.__loader__ alone */
if (PyUnicode_CompareWithASCIIString(filename, "<stdin>") != 0 &&
set_main_loader(d, filename, "SourceFileLoader") < 0) {
fprintf(stderr, "python: failed to set __main__.__loader__\n");
ret = -1;
goto done;
}
v = pyrun_file(fp, filename, Py_file_input, d, d,
closeit, flags);
}
flush_io();
if (v == NULL) {
Py_CLEAR(m);
PyErr_Print();
goto done;
}
Py_DECREF(v);
ret = 0;
done:
if (set_file_name) {
if (PyDict_DelItemString(d, "__file__")) {
PyErr_Clear();
}
if (PyDict_DelItemString(d, "__cached__")) {
PyErr_Clear();
}
}
Py_XDECREF(m);
return ret;
}
int
PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
PyCompilerFlags *flags)
{
PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL) {
return -1;
}
int res = _PyRun_SimpleFileObject(fp, filename_obj, closeit, flags);
Py_DECREF(filename_obj);
return res;
}
int
PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags)
{
PyObject *m, *d, *v;
m = PyImport_AddModule("__main__");
if (m == NULL)
return -1;
d = PyModule_GetDict(m);
v = PyRun_StringFlags(command, Py_file_input, d, d, flags);
if (v == NULL) {
PyErr_Print();
return -1;
}
Py_DECREF(v);
return 0;
}
static int
parse_syntax_error(PyObject *err, PyObject **message, PyObject **filename,
Py_ssize_t *lineno, Py_ssize_t *offset,
Py_ssize_t* end_lineno, Py_ssize_t* end_offset,
PyObject **text)
{
Py_ssize_t hold;
PyObject *v;
*message = NULL;
*filename = NULL;
/* new style errors. `err' is an instance */
*message = PyObject_GetAttr(err, &_Py_ID(msg));
if (!*message)
goto finally;
v = PyObject_GetAttr(err, &_Py_ID(filename));
if (!v)
goto finally;
if (v == Py_None) {
Py_DECREF(v);
_Py_DECLARE_STR(anon_string, "<string>");
*filename = &_Py_STR(anon_string);
Py_INCREF(*filename);
}
else {
*filename = v;
}
v = PyObject_GetAttr(err, &_Py_ID(lineno));
if (!v)
goto finally;
hold = PyLong_AsSsize_t(v);
Py_DECREF(v);
if (hold < 0 && PyErr_Occurred())
goto finally;
*lineno = hold;
v = PyObject_GetAttr(err, &_Py_ID(offset));
if (!v)
goto finally;
if (v == Py_None) {
*offset = -1;
Py_DECREF(v);
} else {
hold = PyLong_AsSsize_t(v);
Py_DECREF(v);
if (hold < 0 && PyErr_Occurred())
goto finally;
*offset = hold;
}
if (Py_TYPE(err) == (PyTypeObject*)PyExc_SyntaxError) {
v = PyObject_GetAttr(err, &_Py_ID(end_lineno));
if (!v) {
PyErr_Clear();
*end_lineno = *lineno;
}
else if (v == Py_None) {
*end_lineno = *lineno;
Py_DECREF(v);
} else {
hold = PyLong_AsSsize_t(v);
Py_DECREF(v);
if (hold < 0 && PyErr_Occurred())
goto finally;
*end_lineno = hold;
}
v = PyObject_GetAttr(err, &_Py_ID(end_offset));
if (!v) {
PyErr_Clear();
*end_offset = -1;
}
else if (v == Py_None) {
*end_offset = -1;
Py_DECREF(v);
} else {
hold = PyLong_AsSsize_t(v);
Py_DECREF(v);
if (hold < 0 && PyErr_Occurred())
goto finally;
*end_offset = hold;
}
} else {
// SyntaxError subclasses
*end_lineno = *lineno;
*end_offset = -1;
}
v = PyObject_GetAttr(err, &_Py_ID(text));
if (!v)
goto finally;
if (v == Py_None) {
Py_DECREF(v);
*text = NULL;
}
else {
*text = v;
}
return 1;
finally:
Py_XDECREF(*message);
Py_XDECREF(*filename);
return 0;
}
static int
print_error_text(PyObject *f, Py_ssize_t offset, Py_ssize_t end_offset,
PyObject *text_obj)
{
size_t caret_repetitions = (end_offset > 0 && end_offset > offset) ?
end_offset - offset : 1;
/* Convert text to a char pointer; return if error */
const char *text = PyUnicode_AsUTF8(text_obj);
if (text == NULL) {
return -1;
}
/* Convert offset from 1-based to 0-based */
offset--;
/* Strip leading whitespace from text, adjusting offset as we go */
while (*text == ' ' || *text == '\t' || *text == '\f') {
text++;
offset--;
}
/* Calculate text length excluding trailing newline */
Py_ssize_t len = strlen(text);
if (len > 0 && text[len-1] == '\n') {
len--;
}
/* Clip offset to at most len */
if (offset > len) {
offset = len;
}
/* Skip past newlines embedded in text */
for (;;) {
const char *nl = strchr(text, '\n');
if (nl == NULL) {
break;
}
Py_ssize_t inl = nl - text;
if (inl >= offset) {
break;
}
inl += 1;
text += inl;
len -= inl;
offset -= (int)inl;
}
/* Print text */
if (PyFile_WriteString(" ", f) < 0) {
return -1;
}
if (PyFile_WriteString(text, f) < 0) {
return -1;
}
/* Make sure there's a newline at the end */
if (text[len] != '\n') {
if (PyFile_WriteString("\n", f) < 0) {
return -1;
}
}
/* Don't print caret if it points to the left of the text */
if (offset < 0) {
return 0;
}
/* Write caret line */
if (PyFile_WriteString(" ", f) < 0) {
return -1;
}
while (--offset >= 0) {
if (PyFile_WriteString(" ", f) < 0) {
return -1;
}
}
for (size_t caret_iter=0; caret_iter < caret_repetitions ; caret_iter++) {
if (PyFile_WriteString("^", f) < 0) {
return -1;
}
}
if (PyFile_WriteString("\n", f) < 0) {
return -1;
}
return 0;
}
int
_Py_HandleSystemExit(int *exitcode_p)
{
int inspect = _Py_GetConfig()->inspect;
if (inspect) {
/* Don't exit if -i flag was given. This flag is set to 0
* when entering interactive mode for inspecting. */
return 0;
}
if (!PyErr_ExceptionMatches(PyExc_SystemExit)) {
return 0;
}
PyObject *exception, *value, *tb;
PyErr_Fetch(&exception, &value, &tb);
fflush(stdout);
int exitcode = 0;
if (value == NULL || value == Py_None) {
goto done;
}
if (PyExceptionInstance_Check(value)) {
/* The error code should be in the `code' attribute. */
PyObject *code = PyObject_GetAttr(value, &_Py_ID(code));
if (code) {
Py_DECREF(value);
value = code;
if (value == Py_None)
goto done;
}
/* If we failed to dig out the 'code' attribute,
just let the else clause below print the error. */
}
if (PyLong_Check(value)) {
exitcode = (int)PyLong_AsLong(value);
}
else {
PyThreadState *tstate = _PyThreadState_GET();
PyObject *sys_stderr = _PySys_GetAttr(tstate, &_Py_ID(stderr));
/* We clear the exception here to avoid triggering the assertion
* in PyObject_Str that ensures it won't silently lose exception
* details.
*/
PyErr_Clear();
if (sys_stderr != NULL && sys_stderr != Py_None) {
PyFile_WriteObject(value, sys_stderr, Py_PRINT_RAW);
} else {
PyObject_Print(value, stderr, Py_PRINT_RAW);
fflush(stderr);
}
PySys_WriteStderr("\n");
exitcode = 1;
}
done:
/* Restore and clear the exception info, in order to properly decref
* the exception, value, and traceback. If we just exit instead,
* these leak, which confuses PYTHONDUMPREFS output, and may prevent
* some finalizers from running.
*/
PyErr_Restore(exception, value, tb);
PyErr_Clear();
*exitcode_p = exitcode;
return 1;
}
static void
handle_system_exit(void)
{
int exitcode;
if (_Py_HandleSystemExit(&exitcode)) {
Py_Exit(exitcode);
}
}
static void
_PyErr_PrintEx(PyThreadState *tstate, int set_sys_last_vars)
{
PyObject *exception, *v, *tb, *hook;
handle_system_exit();
_PyErr_Fetch(tstate, &exception, &v, &tb);
if (exception == NULL) {
goto done;
}
_PyErr_NormalizeException(tstate, &exception, &v, &tb);
if (tb == NULL) {
tb = Py_NewRef(Py_None);
}
PyException_SetTraceback(v, tb);
if (exception == NULL) {
goto done;
}
/* Now we know v != NULL too */
if (set_sys_last_vars) {
if (_PySys_SetAttr(&_Py_ID(last_type), exception) < 0) {
_PyErr_Clear(tstate);
}
if (_PySys_SetAttr(&_Py_ID(last_value), v) < 0) {
_PyErr_Clear(tstate);
}
if (_PySys_SetAttr(&_Py_ID(last_traceback), tb) < 0) {
_PyErr_Clear(tstate);
}
}
hook = _PySys_GetAttr(tstate, &_Py_ID(excepthook));
if (_PySys_Audit(tstate, "sys.excepthook", "OOOO", hook ? hook : Py_None,
exception, v, tb) < 0) {
if (PyErr_ExceptionMatches(PyExc_RuntimeError)) {
PyErr_Clear();
goto done;
}
_PyErr_WriteUnraisableMsg("in audit hook", NULL);
}
if (hook) {
PyObject* stack[3];
PyObject *result;
stack[0] = exception;
stack[1] = v;
stack[2] = tb;
result = _PyObject_FastCall(hook, stack, 3);
if (result == NULL) {
handle_system_exit();
PyObject *exception2, *v2, *tb2;
_PyErr_Fetch(tstate, &exception2, &v2, &tb2);
_PyErr_NormalizeException(tstate, &exception2, &v2, &tb2);
/* It should not be possible for exception2 or v2
to be NULL. However PyErr_Display() can't
tolerate NULLs, so just be safe. */
if (exception2 == NULL) {
exception2 = Py_NewRef(Py_None);
}
if (v2 == NULL) {
v2 = Py_NewRef(Py_None);
}
fflush(stdout);
PySys_WriteStderr("Error in sys.excepthook:\n");
PyErr_Display(exception2, v2, tb2);
PySys_WriteStderr("\nOriginal exception was:\n");
PyErr_Display(exception, v, tb);
Py_DECREF(exception2);
Py_DECREF(v2);
Py_XDECREF(tb2);
}
Py_XDECREF(result);
}
else {
PySys_WriteStderr("sys.excepthook is missing\n");
PyErr_Display(exception, v, tb);
}
done:
Py_XDECREF(exception);
Py_XDECREF(v);
Py_XDECREF(tb);
}
void
_PyErr_Print(PyThreadState *tstate)
{
_PyErr_PrintEx(tstate, 1);
}
void
PyErr_PrintEx(int set_sys_last_vars)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_PrintEx(tstate, set_sys_last_vars);
}
void
PyErr_Print(void)
{
PyErr_PrintEx(1);
}
struct exception_print_context
{
PyObject *file;
PyObject *seen; // Prevent cycles in recursion
int exception_group_depth; // nesting level of current exception group
bool need_close; // Need a closing bottom frame
int max_group_width; // Maximum number of children of each EG
int max_group_depth; // Maximum nesting level of EGs
};
#define EXC_MARGIN(ctx) ((ctx)->exception_group_depth ? "| " : "")
#define EXC_INDENT(ctx) (2 * (ctx)->exception_group_depth)
static int
write_indented_margin(struct exception_print_context *ctx, PyObject *f)
{
return _Py_WriteIndentedMargin(EXC_INDENT(ctx), EXC_MARGIN(ctx), f);
}
static int
print_exception_invalid_type(struct exception_print_context *ctx,
PyObject *value)
{
PyObject *f = ctx->file;
if (_Py_WriteIndent(EXC_INDENT(ctx), f) < 0) {
return -1;
}
const char *const msg = "TypeError: print_exception(): Exception expected "
"for value, ";
if (PyFile_WriteString(msg, f) < 0) {
return -1;
}
if (PyFile_WriteString(Py_TYPE(value)->tp_name, f) < 0) {
return -1;
}
if (PyFile_WriteString(" found\n", f) < 0) {
return -1;
}
return 0;
}
static int
print_exception_traceback(struct exception_print_context *ctx, PyObject *value)
{
PyObject *f = ctx->file;
int err = 0;
PyObject *tb = PyException_GetTraceback(value);
if (tb && tb != Py_None) {
const char *header = EXCEPTION_TB_HEADER;
const char *header_margin = EXC_MARGIN(ctx);
if (_PyBaseExceptionGroup_Check(value)) {
header = EXCEPTION_GROUP_TB_HEADER;
if (ctx->exception_group_depth == 1) {
header_margin = "+ ";
}
}
err = _PyTraceBack_Print_Indented(
tb, EXC_INDENT(ctx), EXC_MARGIN(ctx), header_margin, header, f);
}
Py_XDECREF(tb);
return err;
}
static int
print_exception_file_and_line(struct exception_print_context *ctx,
PyObject **value_p)
{
PyObject *f = ctx->file;
PyObject *tmp;
int res = _PyObject_LookupAttr(*value_p, &_Py_ID(print_file_and_line), &tmp);
if (res <= 0) {
if (res < 0) {
PyErr_Clear();
}
return 0;
}
Py_DECREF(tmp);
PyObject *message, *filename, *text;
Py_ssize_t lineno, offset, end_lineno, end_offset;
if (!parse_syntax_error(*value_p, &message, &filename,
&lineno, &offset,
&end_lineno, &end_offset, &text)) {
PyErr_Clear();
return 0;
}
Py_SETREF(*value_p, message);
PyObject *line = PyUnicode_FromFormat(" File \"%S\", line %zd\n",
filename, lineno);
Py_DECREF(filename);
if (line == NULL) {
goto error;
}
if (write_indented_margin(ctx, f) < 0) {
goto error;
}
if (PyFile_WriteObject(line, f, Py_PRINT_RAW) < 0) {
goto error;
}
Py_CLEAR(line);
if (text != NULL) {
Py_ssize_t line_size;
const char *error_line = PyUnicode_AsUTF8AndSize(text, &line_size);
// If the location of the error spawn multiple lines, we want
// to just print the first one and highlight everything until
// the end of that one since we don't support multi-line error
// messages.
if (end_lineno > lineno) {
end_offset = (error_line != NULL) ? line_size : -1;
}
// Limit the amount of '^' that we can display to
// the size of the text in the source line.
if (error_line != NULL && end_offset > line_size + 1) {
end_offset = line_size + 1;
}