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cpython/Python/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_GetRaisedException()
#include "pycore_pylifecycle.h" // _Py_FdIsInteractive()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_pythonrun.h" // export _PyRun_InteractiveLoopObject()
#include "pycore_sysmodule.h" // _PySys_Audit()
#include "pycore_traceback.h" // _PyTraceBack_Print()
#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
/* Forward */
static void flush_io(void);
static PyObject *run_mod(mod_ty, PyObject *, PyObject *, PyObject *,
PyCompilerFlags *, PyArena *, PyObject*, int);
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);
static PyObject *
_PyRun_StringFlagsWithName(const char *str, PyObject* name, int start,
PyObject *globals, PyObject *locals, PyCompilerFlags *flags,
int generate_new_source);
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;
}
// Call _PyParser_ASTFromFile() with sys.stdin.encoding, sys.ps1 and sys.ps2
static int
pyrun_one_parse_ast(FILE *fp, PyObject *filename,
PyCompilerFlags *flags, PyArena *arena,
mod_ty *pmod, PyObject** interactive_src)
{
PyThreadState *tstate = _PyThreadState_GET();
// Get sys.stdin.encoding (as UTF-8)
PyObject *attr; // borrowed ref
PyObject *encoding_obj = NULL;
const char *encoding = NULL;
if (fp == stdin) {
attr = _PySys_GetAttr(tstate, &_Py_ID(stdin));
if (attr && attr != Py_None) {
encoding_obj = PyObject_GetAttr(attr, &_Py_ID(encoding));
if (encoding_obj) {
encoding = PyUnicode_AsUTF8(encoding_obj);
if (!encoding) {
PyErr_Clear();
}
}
}
}
// Get sys.ps1 (as UTF-8)
attr = _PySys_GetAttr(tstate, &_Py_ID(ps1));
PyObject *ps1_obj = NULL;
const char *ps1 = "";
if (attr != NULL) {
ps1_obj = PyObject_Str(attr);
if (ps1_obj == NULL) {
PyErr_Clear();
}
else if (PyUnicode_Check(ps1_obj)) {
ps1 = PyUnicode_AsUTF8(ps1_obj);
if (ps1 == NULL) {
PyErr_Clear();
ps1 = "";
}
}
}
// Get sys.ps2 (as UTF-8)
attr = _PySys_GetAttr(tstate, &_Py_ID(ps2));
PyObject *ps2_obj = NULL;
const char *ps2 = "";
if (attr != NULL) {
ps2_obj = PyObject_Str(attr);
if (ps2_obj == NULL) {
PyErr_Clear();
}
else if (PyUnicode_Check(ps2_obj)) {
ps2 = PyUnicode_AsUTF8(ps2_obj);
if (ps2 == NULL) {
PyErr_Clear();
ps2 = "";
}
}
}
int errcode = 0;
*pmod = _PyParser_InteractiveASTFromFile(fp, filename, encoding,
Py_single_input, ps1, ps2,
flags, &errcode, interactive_src, arena);
Py_XDECREF(ps1_obj);
Py_XDECREF(ps2_obj);
Py_XDECREF(encoding_obj);
if (*pmod == NULL) {
if (errcode == E_EOF) {
PyErr_Clear();
return E_EOF;
}
return -1;
}
return 0;
}
/* A PyRun_InteractiveOneObject() auxiliary function that does not print the
* error on failure. */
static int
PyRun_InteractiveOneObjectEx(FILE *fp, PyObject *filename,
PyCompilerFlags *flags)
{
PyArena *arena = _PyArena_New();
if (arena == NULL) {
return -1;
}
mod_ty mod;
PyObject *interactive_src;
int parse_res = pyrun_one_parse_ast(fp, filename, flags, arena, &mod, &interactive_src);
if (parse_res != 0) {
_PyArena_Free(arena);
return parse_res;
}
PyObject *main_module = PyImport_AddModuleRef("__main__");
if (main_module == NULL) {
_PyArena_Free(arena);
return -1;
}
PyObject *main_dict = PyModule_GetDict(main_module); // borrowed ref
PyObject *res = run_mod(mod, filename, main_dict, main_dict, flags, arena, interactive_src, 1);
_PyArena_Free(arena);
Py_DECREF(main_module);
if (res == NULL) {
return -1;
}
Py_DECREF(res);
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 *loader_type = _PyImport_GetImportlibExternalLoader(interp,
loader_name);
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)
{
int ret = -1;
PyObject *main_module = PyImport_AddModuleRef("__main__");
if (main_module == NULL)
return -1;
PyObject *dict = PyModule_GetDict(main_module); // borrowed ref
int set_file_name = 0;
int has_file = PyDict_ContainsString(dict, "__file__");
if (has_file < 0) {
goto done;
}
if (!has_file) {
if (PyDict_SetItemString(dict, "__file__", filename) < 0) {
goto done;
}
if (PyDict_SetItemString(dict, "__cached__", Py_None) < 0) {
goto done;
}
set_file_name = 1;
}
int pyc = maybe_pyc_file(fp, filename, closeit);
if (pyc < 0) {
goto done;
}
PyObject *v;
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(dict, 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, dict, dict, flags);
} else {
/* When running from stdin, leave __main__.__loader__ alone */
if (PyUnicode_CompareWithASCIIString(filename, "<stdin>") != 0 &&
set_main_loader(dict, filename, "SourceFileLoader") < 0) {
fprintf(stderr, "python: failed to set __main__.__loader__\n");
ret = -1;
goto done;
}
v = pyrun_file(fp, filename, Py_file_input, dict, dict,
closeit, flags);
}
flush_io();
if (v == NULL) {
Py_CLEAR(main_module);
PyErr_Print();
goto done;
}
Py_DECREF(v);
ret = 0;
done:
if (set_file_name) {
if (PyDict_DelItemString(dict, "__file__")) {
PyErr_Clear();
}
if (PyDict_DelItemString(dict, "__cached__")) {
PyErr_Clear();
}
}
Py_XDECREF(main_module);
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_SimpleStringFlagsWithName(const char *command, const char* name, PyCompilerFlags *flags) {
PyObject *main_module = PyImport_AddModuleRef("__main__");
if (main_module == NULL) {
return -1;
}
PyObject *dict = PyModule_GetDict(main_module); // borrowed ref
PyObject *res = NULL;
if (name == NULL) {
res = PyRun_StringFlags(command, Py_file_input, dict, dict, flags);
} else {
PyObject* the_name = PyUnicode_FromString(name);
if (!the_name) {
PyErr_Print();
return -1;
}
res = _PyRun_StringFlagsWithName(command, the_name, Py_file_input, dict, dict, flags, 0);
Py_DECREF(the_name);
}
Py_DECREF(main_module);
if (res == NULL) {
PyErr_Print();
return -1;
}
Py_DECREF(res);
return 0;
}
int
PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags)
{
return _PyRun_SimpleStringFlagsWithName(command, NULL, flags);
}
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;
}
fflush(stdout);
int exitcode = 0;
PyObject *exc = PyErr_GetRaisedException();
if (exc == NULL) {
goto done;
}
assert(PyExceptionInstance_Check(exc));
/* The error code should be in the `code' attribute. */
PyObject *code = PyObject_GetAttr(exc, &_Py_ID(code));
if (code) {
Py_SETREF(exc, code);
if (exc == 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(exc)) {
exitcode = (int)PyLong_AsLong(exc);
}
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(exc, sys_stderr, Py_PRINT_RAW);
} else {
PyObject_Print(exc, stderr, Py_PRINT_RAW);
fflush(stderr);
}
PySys_WriteStderr("\n");
exitcode = 1;
}
done:
Py_CLEAR(exc);
*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 *typ = NULL, *tb = NULL;
handle_system_exit();
PyObject *exc = _PyErr_GetRaisedException(tstate);
if (exc == NULL) {
goto done;
}
assert(PyExceptionInstance_Check(exc));
typ = Py_NewRef(Py_TYPE(exc));
tb = PyException_GetTraceback(exc);
if (tb == NULL) {
tb = Py_NewRef(Py_None);
}
if (set_sys_last_vars) {
if (_PySys_SetAttr(&_Py_ID(last_exc), exc) < 0) {
_PyErr_Clear(tstate);
}
/* Legacy version: */
if (_PySys_SetAttr(&_Py_ID(last_type), typ) < 0) {
_PyErr_Clear(tstate);
}
if (_PySys_SetAttr(&_Py_ID(last_value), exc) < 0) {
_PyErr_Clear(tstate);
}
if (_PySys_SetAttr(&_Py_ID(last_traceback), tb) < 0) {
_PyErr_Clear(tstate);
}
}
PyObject *hook = _PySys_GetAttr(tstate, &_Py_ID(excepthook));
if (_PySys_Audit(tstate, "sys.excepthook", "OOOO", hook ? hook : Py_None,
typ, exc, tb) < 0) {
if (PyErr_ExceptionMatches(PyExc_RuntimeError)) {
PyErr_Clear();
goto done;
}
_PyErr_WriteUnraisableMsg("in audit hook", NULL);
}
if (hook) {
PyObject* args[3] = {typ, exc, tb};
PyObject *result = PyObject_Vectorcall(hook, args, 3, NULL);
if (result == NULL) {
handle_system_exit();
PyObject *exc2 = _PyErr_GetRaisedException(tstate);
assert(exc2 && PyExceptionInstance_Check(exc2));
fflush(stdout);
PySys_WriteStderr("Error in sys.excepthook:\n");
PyErr_DisplayException(exc2);
PySys_WriteStderr("\nOriginal exception was:\n");
PyErr_DisplayException(exc);
Py_DECREF(exc2);
}
else {
Py_DECREF(result);
}
}
else {
PySys_WriteStderr("sys.excepthook is missing\n");
PyErr_DisplayException(exc);
}
done:
Py_XDECREF(typ);
Py_XDECREF(exc);
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
};
static int
print_exception_invalid_type(struct exception_print_context *ctx,
PyObject *value)
{
PyObject *f = ctx->file;
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;
err = _PyTraceBack_Print(tb, 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_GetOptionalAttr(*value_p, &_Py_ID(print_file_and_line), &tmp);
if (res <= 0) {
if (res < 0) {
PyErr_Clear();
}
return 0;
}
Py_DECREF(tmp);
PyObject *filename = NULL;
Py_ssize_t lineno = 0;
PyObject* v = PyObject_GetAttr(*value_p, &_Py_ID(filename));
if (!v) {
return -1;
}
if (v == Py_None) {
Py_DECREF(v);
_Py_DECLARE_STR(anon_string, "<string>");
filename = Py_NewRef(&_Py_STR(anon_string));
}
else {
filename = v;
}
PyObject *line = PyUnicode_FromFormat(" File \"%S\", line %zd\n",
filename, lineno);
Py_DECREF(filename);
if (line == NULL) {
goto error;
}
if (PyFile_WriteObject(line, f, Py_PRINT_RAW) < 0) {
goto error;
}
Py_CLEAR(line);
assert(!PyErr_Occurred());
return 0;
error:
Py_XDECREF(line);
return -1;
}
/* Prints the message line: module.qualname[: str(exc)] */
static int
print_exception_message(struct exception_print_context *ctx, PyObject *type,
PyObject *value)
{
PyObject *f = ctx->file;
if (PyErr_GivenExceptionMatches(value, PyExc_MemoryError)) {
// The Python APIs in this function require allocating memory
// for various objects. If we're out of memory, we can't do that,
return -1;
}
assert(PyExceptionClass_Check(type));
PyObject *modulename = PyObject_GetAttr(type, &_Py_ID(__module__));
if (modulename == NULL || !PyUnicode_Check(modulename)) {
Py_XDECREF(modulename);
PyErr_Clear();
if (PyFile_WriteString("<unknown>.", f) < 0) {
return -1;
}
}
else {
if (!_PyUnicode_Equal(modulename, &_Py_ID(builtins)) &&
!_PyUnicode_Equal(modulename, &_Py_ID(__main__)))
{
int res = PyFile_WriteObject(modulename, f, Py_PRINT_RAW);
Py_DECREF(modulename);
if (res < 0) {
return -1;
}
if (PyFile_WriteString(".", f) < 0) {
return -1;
}
}
else {
Py_DECREF(modulename);
}
}
PyObject *qualname = PyType_GetQualName((PyTypeObject *)type);
if (qualname == NULL || !PyUnicode_Check(qualname)) {
Py_XDECREF(qualname);
PyErr_Clear();
if (PyFile_WriteString("<unknown>", f) < 0) {
return -1;
}
}
else {
int res = PyFile_WriteObject(qualname, f, Py_PRINT_RAW);
Py_DECREF(qualname);
if (res < 0) {
return -1;
}
}
if (Py_IsNone(value)) {
return 0;
}
PyObject *s = PyObject_Str(value);
if (s == NULL) {
PyErr_Clear();
if (PyFile_WriteString(": <exception str() failed>", f) < 0) {
return -1;
}
}
else {
/* only print colon if the str() of the
object is not the empty string
*/
if (!PyUnicode_Check(s) || PyUnicode_GetLength(s) != 0) {
if (PyFile_WriteString(": ", f) < 0) {
Py_DECREF(s);
return -1;
}
}
int res = PyFile_WriteObject(s, f, Py_PRINT_RAW);
Py_DECREF(s);
if (res < 0) {
return -1;
}
}
return 0;
}
static int
print_exception(struct exception_print_context *ctx, PyObject *value)
{
PyObject *f = ctx->file;
if (!PyExceptionInstance_Check(value)) {
return print_exception_invalid_type(ctx, value);
}
Py_INCREF(value);
fflush(stdout);
if (print_exception_traceback(ctx, value) < 0) {
goto error;
}
/* grab the type and notes now because value can change below */
PyObject *type = (PyObject *) Py_TYPE(value);
if (print_exception_file_and_line(ctx, &value) < 0) {
goto error;
}
if (print_exception_message(ctx, type, value) < 0) {
goto error;
}
if (PyFile_WriteString("\n", f) < 0) {
goto error;
}
Py_DECREF(value);
assert(!PyErr_Occurred());
return 0;
error:
Py_DECREF(value);
return -1;
}
static const char cause_message[] =
"The above exception was the direct cause "
"of the following exception:\n";
static const char context_message[] =
"During handling of the above exception, "
"another exception occurred:\n";
static int
print_exception_recursive(struct exception_print_context*, PyObject*);
static int
print_chained(struct exception_print_context* ctx, PyObject *value,
const char * message, const char *tag)
{
PyObject *f = ctx->file;
if (_Py_EnterRecursiveCall(" in print_chained")) {
return -1;
}
int res = print_exception_recursive(ctx, value);
_Py_LeaveRecursiveCall();
if (res < 0) {
return -1;
}
if (PyFile_WriteString("\n", f) < 0) {
return -1;
}
if (PyFile_WriteString(message, f) < 0) {
return -1;
}
if (PyFile_WriteString("\n", f) < 0) {
return -1;
}
return 0;
}
/* Return true if value is in seen or there was a lookup error.
* Return false if lookup succeeded and the item was not found.
* We suppress errors because this makes us err on the side of
* under-printing which is better than over-printing irregular
* exceptions (e.g., unhashable ones).
*/
static bool
print_exception_seen_lookup(struct exception_print_context *ctx,
PyObject *value)
{
PyObject *check_id = PyLong_FromVoidPtr(value);
if (check_id == NULL) {
PyErr_Clear();
return true;
}
int in_seen = PySet_Contains(ctx->seen, check_id);
Py_DECREF(check_id);
if (in_seen == -1) {
PyErr_Clear();
return true;
}
if (in_seen == 1) {
/* value is in seen */
return true;
}
return false;
}
static int
print_exception_cause_and_context(struct exception_print_context *ctx,
PyObject *value)
{
PyObject *value_id = PyLong_FromVoidPtr(value);
if (value_id == NULL || PySet_Add(ctx->seen, value_id) == -1) {
PyErr_Clear();
Py_XDECREF(value_id);
return 0;
}
Py_DECREF(value_id);
if (!PyExceptionInstance_Check(value)) {
return 0;
}
PyObject *cause = PyException_GetCause(value);
if (cause) {
int err = 0;
if (!print_exception_seen_lookup(ctx, cause)) {
err = print_chained(ctx, cause, cause_message, "cause");
}
Py_DECREF(cause);
return err;
}
if (((PyBaseExceptionObject *)value)->suppress_context) {
return 0;
}
PyObject *context = PyException_GetContext(value);
if (context) {
int err = 0;
if (!print_exception_seen_lookup(ctx, context)) {
err = print_chained(ctx, context, context_message, "context");
}
Py_DECREF(context);
return err;
}
return 0;
}
static int
print_exception_recursive(struct exception_print_context *ctx, PyObject *value)
{
if (_Py_EnterRecursiveCall(" in print_exception_recursive")) {
return -1;
}
if (ctx->seen != NULL) {
/* Exception chaining */
if (print_exception_cause_and_context(ctx, value) < 0) {
goto error;
}
}
if (print_exception(ctx, value) < 0) {
goto error;
}
assert(!PyErr_Occurred());
_Py_LeaveRecursiveCall();
return 0;
error:
_Py_LeaveRecursiveCall();
return -1;
}
void
_PyErr_Display(PyObject *file, PyObject *unused, PyObject *value, PyObject *tb)
{
assert(value != NULL);
assert(file != NULL && file != Py_None);
if (PyExceptionInstance_Check(value)
&& tb != NULL && PyTraceBack_Check(tb)) {
/* Put the traceback on the exception, otherwise it won't get
displayed. See issue #18776. */
PyObject *cur_tb = PyException_GetTraceback(value);
if (cur_tb == NULL) {
PyException_SetTraceback(value, tb);
}
else {
Py_DECREF(cur_tb);
}
}
int unhandled_keyboard_interrupt = _PyRuntime.signals.unhandled_keyboard_interrupt;
// Try first with the stdlib traceback module
PyObject *traceback_module = PyImport_ImportModule("traceback");
if (traceback_module == NULL) {
goto fallback;
}
PyObject *print_exception_fn = PyObject_GetAttrString(traceback_module, "_print_exception_bltin");
if (print_exception_fn == NULL || !PyCallable_Check(print_exception_fn)) {
Py_DECREF(traceback_module);
goto fallback;
}
PyObject* result = PyObject_CallOneArg(print_exception_fn, value);
Py_DECREF(traceback_module);
Py_XDECREF(print_exception_fn);
if (result) {
Py_DECREF(result);
_PyRuntime.signals.unhandled_keyboard_interrupt = unhandled_keyboard_interrupt;
return;
}
fallback:
_PyRuntime.signals.unhandled_keyboard_interrupt = unhandled_keyboard_interrupt;
#ifdef Py_DEBUG
if (PyErr_Occurred()) {
_PyErr_WriteUnraisableMsg("in the internal traceback machinery", NULL);
}
#endif
PyErr_Clear();
struct exception_print_context ctx;
ctx.file = file;
/* We choose to ignore seen being possibly NULL, and report
at least the main exception (it could be a MemoryError).
*/
ctx.seen = PySet_New(NULL);
if (ctx.seen == NULL) {
PyErr_Clear();
}
if (print_exception_recursive(&ctx, value) < 0) {
PyErr_Clear();
_PyObject_Dump(value);
fprintf(stderr, "lost sys.stderr\n");
}
Py_XDECREF(ctx.seen);
/* Call file.flush() */
if (_PyFile_Flush(file) < 0) {
/* Silently ignore file.flush() error */
PyErr_Clear();
}
}
void
PyErr_Display(PyObject *unused, PyObject *value, PyObject *tb)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *file = _PySys_GetAttr(tstate, &_Py_ID(stderr));
if (file == NULL) {
_PyObject_Dump(value);
fprintf(stderr, "lost sys.stderr\n");
return;
}
if (file == Py_None) {
return;
}
Py_INCREF(file);
_PyErr_Display(file, NULL, value, tb);
Py_DECREF(file);
}
void _PyErr_DisplayException(PyObject *file, PyObject *exc)
{
_PyErr_Display(file, NULL, exc, NULL);
}
void PyErr_DisplayException(PyObject *exc)
{
PyErr_Display(NULL, exc, NULL);
}
static PyObject *
_PyRun_StringFlagsWithName(const char *str, PyObject* name, int start,
PyObject *globals, PyObject *locals, PyCompilerFlags *flags,
int generate_new_source)
{
PyObject *ret = NULL;
mod_ty mod;
PyArena *arena;
arena = _PyArena_New();
if (arena == NULL)
return NULL;
PyObject* source = NULL;
_Py_DECLARE_STR(anon_string, "<string>");
if (name) {
source = PyUnicode_FromString(str);
if (!source) {
PyErr_Clear();
}
} else {
name = &_Py_STR(anon_string);
}
mod = _PyParser_ASTFromString(str, name, start, flags, arena);
if (mod != NULL) {
ret = run_mod(mod, name, globals, locals, flags, arena, source, generate_new_source);
}
Py_XDECREF(source);
_PyArena_Free(arena);
return ret;
}
PyObject *
PyRun_StringFlags(const char *str, int start, PyObject *globals,
PyObject *locals, PyCompilerFlags *flags) {
return _PyRun_StringFlagsWithName(str, NULL, start, globals, locals, flags, 0);
}
static PyObject *
pyrun_file(FILE *fp, PyObject *filename, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
{
PyArena *arena = _PyArena_New();
if (arena == NULL) {
return NULL;
}
mod_ty mod;
mod = _PyParser_ASTFromFile(fp, filename, NULL, start, NULL, NULL,
flags, NULL, arena);
if (closeit) {
fclose(fp);
}
PyObject *ret;
if (mod != NULL) {
ret = run_mod(mod, filename, globals, locals, flags, arena, NULL, 0);
}
else {
ret = NULL;
}
_PyArena_Free(arena);
return ret;
}
PyObject *
PyRun_FileExFlags(FILE *fp, const char *filename, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
{
PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL) {
return NULL;
}
PyObject *res = pyrun_file(fp, filename_obj, start, globals,
locals, closeit, flags);
Py_DECREF(filename_obj);
return res;
}
static void
flush_io_stream(PyThreadState *tstate, PyObject *name)
{
PyObject *f = _PySys_GetAttr(tstate, name);
if (f != NULL) {
if (_PyFile_Flush(f) < 0) {
PyErr_Clear();
}
}
}
static void
flush_io(void)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *exc = _PyErr_GetRaisedException(tstate);
flush_io_stream(tstate, &_Py_ID(stderr));
flush_io_stream(tstate, &_Py_ID(stdout));
_PyErr_SetRaisedException(tstate, exc);
}
static PyObject *
run_eval_code_obj(PyThreadState *tstate, PyCodeObject *co, PyObject *globals, PyObject *locals)
{
PyObject *v;
/*
* We explicitly re-initialize _Py_UnhandledKeyboardInterrupt every eval
* _just in case_ someone is calling into an embedded Python where they
* don't care about an uncaught KeyboardInterrupt exception (why didn't they
* leave config.install_signal_handlers set to 0?!?) but then later call
* Py_Main() itself (which _checks_ this flag and dies with a signal after
* its interpreter exits). We don't want a previous embedded interpreter's
* uncaught exception to trigger an unexplained signal exit from a future
* Py_Main() based one.
*/
// XXX Isn't this dealt with by the move to _PyRuntimeState?
_PyRuntime.signals.unhandled_keyboard_interrupt = 0;
/* Set globals['__builtins__'] if it doesn't exist */
if (globals != NULL) {
int has_builtins = PyDict_ContainsString(globals, "__builtins__");
if (has_builtins < 0) {
return NULL;
}
if (!has_builtins) {
if (PyDict_SetItemString(globals, "__builtins__",
tstate->interp->builtins) < 0) {
return NULL;
}
}
}
v = PyEval_EvalCode((PyObject*)co, globals, locals);
if (!v && _PyErr_Occurred(tstate) == PyExc_KeyboardInterrupt) {
_PyRuntime.signals.unhandled_keyboard_interrupt = 1;
}
return v;
}
static PyObject *
run_mod(mod_ty mod, PyObject *filename, PyObject *globals, PyObject *locals,
PyCompilerFlags *flags, PyArena *arena, PyObject* interactive_src,
int generate_new_source)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject* interactive_filename = filename;
if (interactive_src) {
PyInterpreterState *interp = tstate->interp;
if (generate_new_source) {
interactive_filename = PyUnicode_FromFormat(
"%U-%d", filename, interp->_interactive_src_count++);
} else {
Py_INCREF(interactive_filename);
}
if (interactive_filename == NULL) {
return NULL;
}
}
PyCodeObject *co = _PyAST_Compile(mod, interactive_filename, flags, -1, arena);
if (co == NULL) {
if (interactive_src) {
Py_DECREF(interactive_filename);
}
return NULL;
}
if (interactive_src) {
PyObject *linecache_module = PyImport_ImportModule("linecache");
if (linecache_module == NULL) {
Py_DECREF(co);
Py_DECREF(interactive_filename);
return NULL;
}
PyObject *print_tb_func = PyObject_GetAttrString(linecache_module, "_register_code");
if (print_tb_func == NULL) {
Py_DECREF(co);
Py_DECREF(interactive_filename);
Py_DECREF(linecache_module);
return NULL;
}
if (!PyCallable_Check(print_tb_func)) {
Py_DECREF(co);
Py_DECREF(interactive_filename);
Py_DECREF(linecache_module);
Py_DECREF(print_tb_func);
PyErr_SetString(PyExc_ValueError, "linecache._register_code is not callable");
return NULL;
}
PyObject* result = PyObject_CallFunction(
print_tb_func, "OOO",
interactive_filename,
interactive_src,
filename
);
Py_DECREF(interactive_filename);
Py_DECREF(linecache_module);
Py_XDECREF(print_tb_func);
Py_XDECREF(result);
if (!result) {
Py_DECREF(co);
return NULL;
}
}
if (_PySys_Audit(tstate, "exec", "O", co) < 0) {
Py_DECREF(co);
return NULL;
}
PyObject *v = run_eval_code_obj(tstate, co, globals, locals);
Py_DECREF(co);
return v;
}
static PyObject *
run_pyc_file(FILE *fp, PyObject *globals, PyObject *locals,
PyCompilerFlags *flags)
{
PyThreadState *tstate = _PyThreadState_GET();
PyCodeObject *co;
PyObject *v;
long magic;
long PyImport_GetMagicNumber(void);
magic = PyMarshal_ReadLongFromFile(fp);
if (magic != PyImport_GetMagicNumber()) {
if (!PyErr_Occurred())
PyErr_SetString(PyExc_RuntimeError,
"Bad magic number in .pyc file");
goto error;
}
/* Skip the rest of the header. */
(void) PyMarshal_ReadLongFromFile(fp);
(void) PyMarshal_ReadLongFromFile(fp);
(void) PyMarshal_ReadLongFromFile(fp);
if (PyErr_Occurred()) {
goto error;
}
v = PyMarshal_ReadLastObjectFromFile(fp);
if (v == NULL || !PyCode_Check(v)) {
Py_XDECREF(v);
PyErr_SetString(PyExc_RuntimeError,
"Bad code object in .pyc file");
goto error;
}
fclose(fp);
co = (PyCodeObject *)v;
v = run_eval_code_obj(tstate, co, globals, locals);
if (v && flags)
flags->cf_flags |= (co->co_flags & PyCF_MASK);
Py_DECREF(co);
return v;
error:
fclose(fp);
return NULL;
}
PyObject *
Py_CompileStringObject(const char *str, PyObject *filename, int start,
PyCompilerFlags *flags, int optimize)
{
PyCodeObject *co;
mod_ty mod;
PyArena *arena = _PyArena_New();
if (arena == NULL)
return NULL;
mod = _PyParser_ASTFromString(str, filename, start, flags, arena);
if (mod == NULL) {
_PyArena_Free(arena);
return NULL;
}
if (flags && (flags->cf_flags & PyCF_ONLY_AST)) {
if ((flags->cf_flags & PyCF_OPTIMIZED_AST) == PyCF_OPTIMIZED_AST) {
if (_PyCompile_AstOptimize(mod, filename, flags, optimize, arena) < 0) {
return NULL;
}
}
PyObject *result = PyAST_mod2obj(mod);
_PyArena_Free(arena);
return result;
}
co = _PyAST_Compile(mod, filename, flags, optimize, arena);
_PyArena_Free(arena);
return (PyObject *)co;
}
PyObject *
Py_CompileStringExFlags(const char *str, const char *filename_str, int start,
PyCompilerFlags *flags, int optimize)
{
PyObject *filename, *co;
filename = PyUnicode_DecodeFSDefault(filename_str);
if (filename == NULL)
return NULL;
co = Py_CompileStringObject(str, filename, start, flags, optimize);
Py_DECREF(filename);
return co;
}
const char *
_Py_SourceAsString(PyObject *cmd, const char *funcname, const char *what, PyCompilerFlags *cf, PyObject **cmd_copy)
{
const char *str;
Py_ssize_t size;
Py_buffer view;
*cmd_copy = NULL;
if (PyUnicode_Check(cmd)) {
cf->cf_flags |= PyCF_IGNORE_COOKIE;
str = PyUnicode_AsUTF8AndSize(cmd, &size);
if (str == NULL)
return NULL;
}
else if (PyBytes_Check(cmd)) {
str = PyBytes_AS_STRING(cmd);
size = PyBytes_GET_SIZE(cmd);
}
else if (PyByteArray_Check(cmd)) {
str = PyByteArray_AS_STRING(cmd);
size = PyByteArray_GET_SIZE(cmd);
}
else if (PyObject_GetBuffer(cmd, &view, PyBUF_SIMPLE) == 0) {
/* Copy to NUL-terminated buffer. */
*cmd_copy = PyBytes_FromStringAndSize(
(const char *)view.buf, view.len);
PyBuffer_Release(&view);
if (*cmd_copy == NULL) {
return NULL;
}
str = PyBytes_AS_STRING(*cmd_copy);
size = PyBytes_GET_SIZE(*cmd_copy);
}
else {
PyErr_Format(PyExc_TypeError,
"%s() arg 1 must be a %s object",
funcname, what);
return NULL;
}
if (strlen(str) != (size_t)size) {
PyErr_SetString(PyExc_SyntaxError,
"source code string cannot contain null bytes");
Py_CLEAR(*cmd_copy);
return NULL;
}
return str;
}
#if defined(USE_STACKCHECK)
#if defined(WIN32) && defined(_MSC_VER)
/* Stack checking for Microsoft C */
#include <malloc.h>
#include <excpt.h>
/*
* Return non-zero when we run out of memory on the stack; zero otherwise.
*/
int
PyOS_CheckStack(void)
{
__try {
/* alloca throws a stack overflow exception if there's
not enough space left on the stack */
alloca(PYOS_STACK_MARGIN * sizeof(void*));
return 0;
} __except (GetExceptionCode() == STATUS_STACK_OVERFLOW ?
EXCEPTION_EXECUTE_HANDLER :
EXCEPTION_CONTINUE_SEARCH) {
int errcode = _resetstkoflw();
if (errcode == 0)
{
Py_FatalError("Could not reset the stack!");
}
}
return 1;
}
#endif /* WIN32 && _MSC_VER */
/* Alternate implementations can be added here... */
#endif /* USE_STACKCHECK */
/* Deprecated C API functions still provided for binary compatibility */
#undef PyRun_AnyFile
PyAPI_FUNC(int)
PyRun_AnyFile(FILE *fp, const char *name)
{
return PyRun_AnyFileExFlags(fp, name, 0, NULL);
}
#undef PyRun_AnyFileEx
PyAPI_FUNC(int)
PyRun_AnyFileEx(FILE *fp, const char *name, int closeit)
{
return PyRun_AnyFileExFlags(fp, name, closeit, NULL);
}
#undef PyRun_AnyFileFlags
PyAPI_FUNC(int)
PyRun_AnyFileFlags(FILE *fp, const char *name, PyCompilerFlags *flags)
{
return PyRun_AnyFileExFlags(fp, name, 0, flags);
}
#undef PyRun_File
PyAPI_FUNC(PyObject *)
PyRun_File(FILE *fp, const char *p, int s, PyObject *g, PyObject *l)
{
return PyRun_FileExFlags(fp, p, s, g, l, 0, NULL);
}
#undef PyRun_FileEx
PyAPI_FUNC(PyObject *)
PyRun_FileEx(FILE *fp, const char *p, int s, PyObject *g, PyObject *l, int c)
{
return PyRun_FileExFlags(fp, p, s, g, l, c, NULL);
}
#undef PyRun_FileFlags
PyAPI_FUNC(PyObject *)
PyRun_FileFlags(FILE *fp, const char *p, int s, PyObject *g, PyObject *l,
PyCompilerFlags *flags)
{
return PyRun_FileExFlags(fp, p, s, g, l, 0, flags);
}
#undef PyRun_SimpleFile
PyAPI_FUNC(int)
PyRun_SimpleFile(FILE *f, const char *p)
{
return PyRun_SimpleFileExFlags(f, p, 0, NULL);
}
#undef PyRun_SimpleFileEx
PyAPI_FUNC(int)
PyRun_SimpleFileEx(FILE *f, const char *p, int c)
{
return PyRun_SimpleFileExFlags(f, p, c, NULL);
}
#undef PyRun_String
PyAPI_FUNC(PyObject *)
PyRun_String(const char *str, int s, PyObject *g, PyObject *l)
{
return PyRun_StringFlags(str, s, g, l, NULL);
}
#undef PyRun_SimpleString
PyAPI_FUNC(int)
PyRun_SimpleString(const char *s)
{
return PyRun_SimpleStringFlags(s, NULL);
}
#undef Py_CompileString
PyAPI_FUNC(PyObject *)
Py_CompileString(const char *str, const char *p, int s)
{
return Py_CompileStringExFlags(str, p, s, NULL, -1);
}
#undef Py_CompileStringFlags
PyAPI_FUNC(PyObject *)
Py_CompileStringFlags(const char *str, const char *p, int s,
PyCompilerFlags *flags)
{
return Py_CompileStringExFlags(str, p, s, flags, -1);
}
#undef PyRun_InteractiveOne
PyAPI_FUNC(int)
PyRun_InteractiveOne(FILE *f, const char *p)
{
return PyRun_InteractiveOneFlags(f, p, NULL);
}
#undef PyRun_InteractiveLoop
PyAPI_FUNC(int)
PyRun_InteractiveLoop(FILE *f, const char *p)
{
return PyRun_InteractiveLoopFlags(f, p, NULL);
}
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