cpython/Python/pythonrun.c at 1d1bb95abdcafe92c771fb3dc4722351b032cc24 · python/cpython · GitHub

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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_NewRef(&_Py_STR(anon_string));

}

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_SETREF(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;

}

if (print_error_text(f, offset, end_offset, text) < 0) {

goto error;

View remainder of file in raw view

cpython/Python/pythonrun.c at 1d1bb95abdcafe92c771fb3dc4722351b032cc24 · python/cpython · GitHub

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