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cpython/Python/pythonrun.c
Serhiy Storchaka 98c4433a81
bpo-41991: Remove _PyObject_HasAttrId (GH-22629) 
It can silence arbitrary exceptions.
2020-10-10 22:23:42 +03:00

1371 lines
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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 (boostrap,
* pythonrun, shutdown)
*/
/* TODO: Cull includes following phase split */
#include "Python.h"
#include "Python-ast.h"
#undef Yield /* undefine macro conflicting with <winbase.h> */
#include "pycore_interp.h" // PyInterpreterState.importlib
#include "pycore_object.h" // _PyDebug_PrintTotalRefs()
#include "pycore_pyerrors.h" // _PyErr_Fetch
#include "pycore_pylifecycle.h" // _Py_UnhandledKeyboardInterrupt
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_sysmodule.h" // _PySys_Audit()
#include "token.h" // INDENT
#include "errcode.h" // E_EOF
#include "code.h" // PyCodeObject
#include "symtable.h" // PySymtable_BuildObject()
#include "marshal.h" // PyMarshal_ReadLongFromFile()
#include "parser_interface.h" // PyParser_ASTFrom*
#ifdef MS_WINDOWS
# include "malloc.h" // alloca()
#endif
#ifdef MS_WINDOWS
# undef BYTE
# include "windows.h"
#endif
_Py_IDENTIFIER(builtins);
_Py_IDENTIFIER(excepthook);
_Py_IDENTIFIER(flush);
_Py_IDENTIFIER(last_traceback);
_Py_IDENTIFIER(last_type);
_Py_IDENTIFIER(last_value);
_Py_IDENTIFIER(ps1);
_Py_IDENTIFIER(ps2);
_Py_IDENTIFIER(stdin);
_Py_IDENTIFIER(stdout);
_Py_IDENTIFIER(stderr);
_Py_static_string(PyId_string, "<string>");
#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 *, const char *, PyObject *, PyObject *,
PyCompilerFlags *);
static int PyRun_InteractiveOneObjectEx(FILE *, PyObject *, PyCompilerFlags *);
/* Parse input from a file and execute it */
int
PyRun_AnyFileExFlags(FILE *fp, const char *filename, int closeit,
PyCompilerFlags *flags)
{
if (filename == NULL)
filename = "???";
if (Py_FdIsInteractive(fp, filename)) {
int err = PyRun_InteractiveLoopFlags(fp, filename, flags);
if (closeit)
fclose(fp);
return err;
}
else
return PyRun_SimpleFileExFlags(fp, filename, closeit, flags);
}
int
PyRun_InteractiveLoopFlags(FILE *fp, const char *filename_str, PyCompilerFlags *flags)
{
PyObject *filename, *v;
int ret, err;
PyCompilerFlags local_flags = _PyCompilerFlags_INIT;
int nomem_count = 0;
#ifdef Py_REF_DEBUG
int show_ref_count = _Py_GetConfig()->show_ref_count;
#endif
filename = PyUnicode_DecodeFSDefault(filename_str);
if (filename == NULL) {
PyErr_Print();
return -1;
}
if (flags == NULL) {
flags = &local_flags;
}
v = _PySys_GetObjectId(&PyId_ps1);
if (v == NULL) {
_PySys_SetObjectId(&PyId_ps1, v = PyUnicode_FromString(">>> "));
Py_XDECREF(v);
}
v = _PySys_GetObjectId(&PyId_ps2);
if (v == NULL) {
_PySys_SetObjectId(&PyId_ps2, v = PyUnicode_FromString("... "));
Py_XDECREF(v);
}
err = 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);
Py_DECREF(filename);
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_name;
mod_ty mod;
PyArena *arena;
const char *ps1 = "", *ps2 = "", *enc = NULL;
int errcode = 0;
_Py_IDENTIFIER(encoding);
_Py_IDENTIFIER(__main__);
mod_name = _PyUnicode_FromId(&PyId___main__); /* borrowed */
if (mod_name == NULL) {
return -1;
}
if (fp == stdin) {
/* Fetch encoding from sys.stdin if possible. */
v = _PySys_GetObjectId(&PyId_stdin);
if (v && v != Py_None) {
oenc = _PyObject_GetAttrId(v, &PyId_encoding);
if (oenc)
enc = PyUnicode_AsUTF8(oenc);
if (!enc)
PyErr_Clear();
}
}
v = _PySys_GetObjectId(&PyId_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_GetObjectId(&PyId_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_ASTFromFileObject(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(mod_name);
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, const char* filename, const char* ext, int closeit)
{
if (strcmp(ext, ".pyc") == 0)
return 1;
/* Only look into the file if we are allowed to close it, since
it then should also be seekable. */
if (closeit) {
/* 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;
}
return 0;
}
static int
set_main_loader(PyObject *d, const char *filename, const char *loader_name)
{
PyObject *filename_obj, *bootstrap, *loader_type = NULL, *loader;
int result = 0;
filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL)
return -1;
PyInterpreterState *interp = _PyInterpreterState_GET();
bootstrap = PyObject_GetAttrString(interp->importlib,
"_bootstrap_external");
if (bootstrap != NULL) {
loader_type = PyObject_GetAttrString(bootstrap, loader_name);
Py_DECREF(bootstrap);
}
if (loader_type == NULL) {
Py_DECREF(filename_obj);
return -1;
}
loader = PyObject_CallFunction(loader_type, "sN", "__main__", filename_obj);
Py_DECREF(loader_type);
if (loader == NULL) {
return -1;
}
if (PyDict_SetItemString(d, "__loader__", loader) < 0) {
result = -1;
}
Py_DECREF(loader);
return result;
}
int
PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
PyCompilerFlags *flags)
{
PyObject *m, *d, *v;
const char *ext;
int set_file_name = 0, ret = -1;
size_t len;
m = PyImport_AddModule("__main__");
if (m == NULL)
return -1;
Py_INCREF(m);
d = PyModule_GetDict(m);
if (PyDict_GetItemString(d, "__file__") == NULL) {
PyObject *f;
f = PyUnicode_DecodeFSDefault(filename);
if (f == NULL)
goto done;
if (PyDict_SetItemString(d, "__file__", f) < 0) {
Py_DECREF(f);
goto done;
}
if (PyDict_SetItemString(d, "__cached__", Py_None) < 0) {
Py_DECREF(f);
goto done;
}
set_file_name = 1;
Py_DECREF(f);
}
len = strlen(filename);
ext = filename + len - (len > 4 ? 4 : 0);
if (maybe_pyc_file(fp, filename, ext, closeit)) {
FILE *pyc_fp;
/* Try to run a pyc file. First, re-open in binary */
if (closeit)
fclose(fp);
if ((pyc_fp = _Py_fopen(filename, "rb")) == 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, filename, d, d, flags);
} else {
/* When running from stdin, leave __main__.__loader__ alone */
if (strcmp(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_FileExFlags(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_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, PyObject **text)
{
Py_ssize_t hold;
PyObject *v;
_Py_IDENTIFIER(msg);
_Py_IDENTIFIER(filename);
_Py_IDENTIFIER(lineno);
_Py_IDENTIFIER(offset);
_Py_IDENTIFIER(text);
*message = NULL;
*filename = NULL;
/* new style errors. `err' is an instance */
*message = _PyObject_GetAttrId(err, &PyId_msg);
if (!*message)
goto finally;
v = _PyObject_GetAttrId(err, &PyId_filename);
if (!v)
goto finally;
if (v == Py_None) {
Py_DECREF(v);
*filename = _PyUnicode_FromId(&PyId_string);
if (*filename == NULL)
goto finally;
Py_INCREF(*filename);
}
else {
*filename = v;
}
v = _PyObject_GetAttrId(err, &PyId_lineno);
if (!v)
goto finally;
hold = PyLong_AsSsize_t(v);
Py_DECREF(v);
if (hold < 0 && PyErr_Occurred())
goto finally;
*lineno = hold;
v = _PyObject_GetAttrId(err, &PyId_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;
}
v = _PyObject_GetAttrId(err, &PyId_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 void
print_error_text(PyObject *f, Py_ssize_t offset, PyObject *text_obj)
{
/* Convert text to a char pointer; return if error */
const char *text = PyUnicode_AsUTF8(text_obj);
if (text == NULL)
return;
/* 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 */
PyFile_WriteString(" ", f);
PyFile_WriteString(text, f);
/* Make sure there's a newline at the end */
if (text[len] != '\n') {
PyFile_WriteString("\n", f);
}
/* Don't print caret if it points to the left of the text */
if (offset < 0)
return;
/* Write caret line */
PyFile_WriteString(" ", f);
while (--offset >= 0) {
PyFile_WriteString(" ", f);
}
PyFile_WriteString("^\n", f);
}
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. */
_Py_IDENTIFIER(code);
PyObject *code = _PyObject_GetAttrId(value, &PyId_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 {
PyObject *sys_stderr = _PySys_GetObjectId(&PyId_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_None;
Py_INCREF(tb);
}
PyException_SetTraceback(v, tb);
if (exception == NULL) {
goto done;
}
/* Now we know v != NULL too */
if (set_sys_last_vars) {
if (_PySys_SetObjectId(&PyId_last_type, exception) < 0) {
_PyErr_Clear(tstate);
}
if (_PySys_SetObjectId(&PyId_last_value, v) < 0) {
_PyErr_Clear(tstate);
}
if (_PySys_SetObjectId(&PyId_last_traceback, tb) < 0) {
_PyErr_Clear(tstate);
}
}
hook = _PySys_GetObjectId(&PyId_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_None;
Py_INCREF(exception2);
}
if (v2 == NULL) {
v2 = Py_None;
Py_INCREF(v2);
}
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);
}
static void
print_exception(PyObject *f, PyObject *value)
{
int err = 0;
PyObject *type, *tb, *tmp;
_Py_IDENTIFIER(print_file_and_line);
if (!PyExceptionInstance_Check(value)) {
err = PyFile_WriteString("TypeError: print_exception(): Exception expected for value, ", f);
err += PyFile_WriteString(Py_TYPE(value)->tp_name, f);
err += PyFile_WriteString(" found\n", f);
if (err)
PyErr_Clear();
return;
}
Py_INCREF(value);
fflush(stdout);
type = (PyObject *) Py_TYPE(value);
tb = PyException_GetTraceback(value);
if (tb && tb != Py_None)
err = PyTraceBack_Print(tb, f);
if (err == 0 &&
(err = _PyObject_LookupAttrId(value, &PyId_print_file_and_line, &tmp)) > 0)
{
PyObject *message, *filename, *text;
Py_ssize_t lineno, offset;
err = 0;
Py_DECREF(tmp);
if (!parse_syntax_error(value, &message, &filename,
&lineno, &offset, &text))
PyErr_Clear();
else {
PyObject *line;
Py_DECREF(value);
value = message;
line = PyUnicode_FromFormat(" File \"%S\", line %zd\n",
filename, lineno);
Py_DECREF(filename);
if (line != NULL) {
PyFile_WriteObject(line, f, Py_PRINT_RAW);
Py_DECREF(line);
}
if (text != NULL) {
print_error_text(f, offset, text);
Py_DECREF(text);
}
/* Can't be bothered to check all those
PyFile_WriteString() calls */
if (PyErr_Occurred())
err = -1;
}
}
if (err) {
/* Don't do anything else */
}
else {
PyObject* moduleName;
const char *className;
_Py_IDENTIFIER(__module__);
assert(PyExceptionClass_Check(type));
className = PyExceptionClass_Name(type);
if (className != NULL) {
const char *dot = strrchr(className, '.');
if (dot != NULL)
className = dot+1;
}
moduleName = _PyObject_GetAttrId(type, &PyId___module__);
if (moduleName == NULL || !PyUnicode_Check(moduleName))
{
Py_XDECREF(moduleName);
err = PyFile_WriteString("<unknown>", f);
}
else {
if (!_PyUnicode_EqualToASCIIId(moduleName, &PyId_builtins))
{
err = PyFile_WriteObject(moduleName, f, Py_PRINT_RAW);
err += PyFile_WriteString(".", f);
}
Py_DECREF(moduleName);
}
if (err == 0) {
if (className == NULL)
err = PyFile_WriteString("<unknown>", f);
else
err = PyFile_WriteString(className, f);
}
}
if (err == 0 && (value != Py_None)) {
PyObject *s = PyObject_Str(value);
/* only print colon if the str() of the
object is not the empty string
*/
if (s == NULL) {
PyErr_Clear();
err = -1;
PyFile_WriteString(": <exception str() failed>", f);
}
else if (!PyUnicode_Check(s) ||
PyUnicode_GetLength(s) != 0)
err = PyFile_WriteString(": ", f);
if (err == 0)
err = PyFile_WriteObject(s, f, Py_PRINT_RAW);
Py_XDECREF(s);
}
/* try to write a newline in any case */
if (err < 0) {
PyErr_Clear();
}
err += PyFile_WriteString("\n", f);
Py_XDECREF(tb);
Py_DECREF(value);
/* If an error happened here, don't show it.
XXX This is wrong, but too many callers rely on this behavior. */
if (err != 0)
PyErr_Clear();
}
static const char cause_message[] =
"\nThe above exception was the direct cause "
"of the following exception:\n\n";
static const char context_message[] =
"\nDuring handling of the above exception, "
"another exception occurred:\n\n";
static void
print_exception_recursive(PyObject *f, PyObject *value, PyObject *seen)
{
int err = 0, res;
PyObject *cause, *context;
if (seen != NULL) {
/* Exception chaining */
PyObject *value_id = PyLong_FromVoidPtr(value);
if (value_id == NULL || PySet_Add(seen, value_id) == -1)
PyErr_Clear();
else if (PyExceptionInstance_Check(value)) {
PyObject *check_id = NULL;
cause = PyException_GetCause(value);
context = PyException_GetContext(value);
if (cause) {
check_id = PyLong_FromVoidPtr(cause);
if (check_id == NULL) {
res = -1;
} else {
res = PySet_Contains(seen, check_id);
Py_DECREF(check_id);
}
if (res == -1)
PyErr_Clear();
if (res == 0) {
print_exception_recursive(
f, cause, seen);
err |= PyFile_WriteString(
cause_message, f);
}
}
else if (context &&
!((PyBaseExceptionObject *)value)->suppress_context) {
check_id = PyLong_FromVoidPtr(context);
if (check_id == NULL) {
res = -1;
} else {
res = PySet_Contains(seen, check_id);
Py_DECREF(check_id);
}
if (res == -1)
PyErr_Clear();
if (res == 0) {
print_exception_recursive(
f, context, seen);
err |= PyFile_WriteString(
context_message, f);
}
}
Py_XDECREF(context);
Py_XDECREF(cause);
}
Py_XDECREF(value_id);
}
print_exception(f, value);
if (err != 0)
PyErr_Clear();
}
void
_PyErr_Display(PyObject *file, PyObject *exception, PyObject *value, PyObject *tb)
{
assert(file != NULL && file != Py_None);
PyObject *seen;
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);
}
/* We choose to ignore seen being possibly NULL, and report
at least the main exception (it could be a MemoryError).
*/
seen = PySet_New(NULL);
if (seen == NULL) {
PyErr_Clear();
}
print_exception_recursive(file, value, seen);
Py_XDECREF(seen);
/* Call file.flush() */
PyObject *res = _PyObject_CallMethodIdNoArgs(file, &PyId_flush);
if (!res) {
/* Silently ignore file.flush() error */
PyErr_Clear();
}
else {
Py_DECREF(res);
}
}
void
PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
{
PyObject *file = _PySys_GetObjectId(&PyId_stderr);
if (file == NULL) {
_PyObject_Dump(value);
fprintf(stderr, "lost sys.stderr\n");
return;
}
if (file == Py_None) {
return;
}
_PyErr_Display(file, exception, value, tb);
}
PyObject *
PyRun_StringFlags(const char *str, int start, PyObject *globals,
PyObject *locals, PyCompilerFlags *flags)
{
PyObject *ret = NULL;
mod_ty mod;
PyArena *arena;
PyObject *filename;
filename = _PyUnicode_FromId(&PyId_string); /* borrowed */
if (filename == NULL)
return NULL;
arena = PyArena_New();
if (arena == NULL)
return NULL;
mod = PyParser_ASTFromStringObject(str, filename, start, flags, arena);
if (mod != NULL)
ret = run_mod(mod, filename, globals, locals, flags, arena);
PyArena_Free(arena);
return ret;
}
PyObject *
PyRun_FileExFlags(FILE *fp, const char *filename_str, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
{
PyObject *ret = NULL;
mod_ty mod;
PyArena *arena = NULL;
PyObject *filename;
filename = PyUnicode_DecodeFSDefault(filename_str);
if (filename == NULL)
goto exit;
arena = PyArena_New();
if (arena == NULL)
goto exit;
mod = PyParser_ASTFromFileObject(fp, filename, NULL, start, NULL, NULL,
flags, NULL, arena);
if (closeit)
fclose(fp);
if (mod == NULL) {
goto exit;
}
ret = run_mod(mod, filename, globals, locals, flags, arena);
exit:
Py_XDECREF(filename);
if (arena != NULL)
PyArena_Free(arena);
return ret;
}
static void
flush_io(void)
{
PyObject *f, *r;
PyObject *type, *value, *traceback;
/* Save the current exception */
PyErr_Fetch(&type, &value, &traceback);
f = _PySys_GetObjectId(&PyId_stderr);
if (f != NULL) {
r = _PyObject_CallMethodIdNoArgs(f, &PyId_flush);
if (r)
Py_DECREF(r);
else
PyErr_Clear();
}
f = _PySys_GetObjectId(&PyId_stdout);
if (f != NULL) {
r = _PyObject_CallMethodIdNoArgs(f, &PyId_flush);
if (r)
Py_DECREF(r);
else
PyErr_Clear();
}
PyErr_Restore(type, value, traceback);
}
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.
*/
_Py_UnhandledKeyboardInterrupt = 0;
/* Set globals['__builtins__'] if it doesn't exist */
if (globals != NULL && PyDict_GetItemString(globals, "__builtins__") == NULL) {
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) {
_Py_UnhandledKeyboardInterrupt = 1;
}
return v;
}
static PyObject *
run_mod(mod_ty mod, PyObject *filename, PyObject *globals, PyObject *locals,
PyCompilerFlags *flags, PyArena *arena)
{
PyThreadState *tstate = _PyThreadState_GET();
PyCodeObject *co = PyAST_CompileObject(mod, filename, flags, -1, arena);
if (co == NULL)
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, const char *filename, 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_ASTFromStringObject(str, filename, start, flags, arena);
if (mod == NULL) {
PyArena_Free(arena);
return NULL;
}
if (flags && (flags->cf_flags & PyCF_ONLY_AST)) {
PyObject *result = PyAST_mod2obj(mod);
PyArena_Free(arena);
return result;
}
co = PyAST_CompileObject(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;
}
/* For use in Py_LIMITED_API */
#undef Py_CompileString
PyObject *
PyCompileString(const char *str, const char *filename, int start)
{
return Py_CompileStringFlags(str, filename, start, NULL);
}
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_ValueError,
"source code string cannot contain null bytes");
Py_CLEAR(*cmd_copy);
return NULL;
}
return str;
}
struct symtable *
Py_SymtableStringObject(const char *str, PyObject *filename, int start)
{
PyCompilerFlags flags = _PyCompilerFlags_INIT;
return _Py_SymtableStringObjectFlags(str, filename, start, &flags);
}
struct symtable *
_Py_SymtableStringObjectFlags(const char *str, PyObject *filename, int start, PyCompilerFlags *flags)
{
struct symtable *st;
mod_ty mod;
PyArena *arena;
arena = PyArena_New();
if (arena == NULL)
return NULL;
mod = PyParser_ASTFromStringObject(str, filename, start, flags, arena);
if (mod == NULL) {
PyArena_Free(arena);
return NULL;
}
st = PySymtable_BuildObject(mod, filename, 0);
PyArena_Free(arena);
return st;
}
struct symtable *
Py_SymtableString(const char *str, const char *filename_str, int start)
{
PyObject *filename;
struct symtable *st;
filename = PyUnicode_DecodeFSDefault(filename_str);
if (filename == NULL)
return NULL;
st = Py_SymtableStringObject(str, filename, start);
Py_DECREF(filename);
return st;
}
#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 */
#ifdef __cplusplus
}
#endif
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