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gh-81057: Move faulthandler Globals to _PyRuntimeState (gh-100152)
#81057
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9 files changed

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-73
lines changed

9 files changed

+120
-73
lines changed

‎Include/internal/pycore_faulthandler.h

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@@ -0,0 +1,99 @@
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#ifndef Py_INTERNAL_FAULTHANDLER_H
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#define Py_INTERNAL_FAULTHANDLER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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# error "this header requires Py_BUILD_CORE define"
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#endif
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#ifdef HAVE_SIGACTION
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# include <signal.h>
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#endif
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#ifndef MS_WINDOWS
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/* register() is useless on Windows, because only SIGSEGV, SIGABRT and
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SIGILL can be handled by the process, and these signals can only be used
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with enable(), not using register() */
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# define FAULTHANDLER_USER
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#endif
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#ifdef HAVE_SIGACTION
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/* Using an alternative stack requires sigaltstack()
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and sigaction() SA_ONSTACK */
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# ifdef HAVE_SIGALTSTACK
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# define FAULTHANDLER_USE_ALT_STACK
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# endif
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typedef struct sigaction _Py_sighandler_t;
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#else
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typedef PyOS_sighandler_t _Py_sighandler_t;
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#endif // HAVE_SIGACTION
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#ifdef FAULTHANDLER_USER
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struct faulthandler_user_signal {
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int enabled;
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PyObject *file;
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int fd;
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int all_threads;
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int chain;
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_Py_sighandler_t previous;
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PyInterpreterState *interp;
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};
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#endif /* FAULTHANDLER_USER */
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struct _faulthandler_runtime_state {
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struct {
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int enabled;
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PyObject *file;
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int fd;
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int all_threads;
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PyInterpreterState *interp;
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#ifdef MS_WINDOWS
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void *exc_handler;
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#endif
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} fatal_error;
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struct {
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PyObject *file;
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int fd;
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PY_TIMEOUT_T timeout_us; /* timeout in microseconds */
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int repeat;
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PyInterpreterState *interp;
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int exit;
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char *header;
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size_t header_len;
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/* The main thread always holds this lock. It is only released when
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faulthandler_thread() is interrupted before this thread exits, or at
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Python exit. */
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PyThread_type_lock cancel_event;
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/* released by child thread when joined */
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PyThread_type_lock running;
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} thread;
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#ifdef FAULTHANDLER_USER
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struct faulthandler_user_signal *user_signals;
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#endif
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#ifdef FAULTHANDLER_USE_ALT_STACK
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stack_t stack;
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stack_t old_stack;
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#endif
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};
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#define _faulthandler_runtime_state_INIT \
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{ \
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.fatal_error = { \
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.fd = -1, \
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}, \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_INTERNAL_FAULTHANDLER_H */

‎Include/internal/pycore_runtime.h

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@@ -13,6 +13,7 @@ extern "C" {
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#include "pycore_dict_state.h" // struct _Py_dict_runtime_state
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#include "pycore_dtoa.h" // struct _dtoa_runtime_state
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#include "pycore_floatobject.h" // struct _Py_float_runtime_state
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#include "pycore_faulthandler.h" // struct _faulthandler_runtime_state
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#include "pycore_function.h" // struct _func_runtime_state
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#include "pycore_global_objects.h" // struct _Py_global_objects
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#include "pycore_import.h" // struct _import_runtime_state
@@ -140,6 +141,7 @@ typedef struct pyruntimestate {
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struct _getargs_runtime_state getargs;
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struct _dtoa_runtime_state dtoa;
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struct _fileutils_state fileutils;
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struct _faulthandler_runtime_state faulthandler;
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struct _tracemalloc_runtime_state tracemalloc;
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PyPreConfig preconfig;

‎Include/internal/pycore_runtime_init.h

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@@ -54,6 +54,7 @@ extern "C" {
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.fileutils = { \
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.force_ascii = -1, \
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}, \
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.faulthandler = _faulthandler_runtime_state_INIT, \
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.tracemalloc = _tracemalloc_runtime_state_INIT, \
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.float_state = { \
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.float_format = _py_float_format_unknown, \

‎Makefile.pre.in

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@@ -1634,6 +1634,7 @@ PYTHON_HEADERS= \
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$(srcdir)/Include/internal/pycore_descrobject.h \
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$(srcdir)/Include/internal/pycore_dtoa.h \
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$(srcdir)/Include/internal/pycore_exceptions.h \
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$(srcdir)/Include/internal/pycore_faulthandler.h \
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$(srcdir)/Include/internal/pycore_fileutils.h \
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$(srcdir)/Include/internal/pycore_floatobject.h \
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$(srcdir)/Include/internal/pycore_format.h \

‎Modules/faulthandler.c

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@@ -18,12 +18,6 @@
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# include <sys/resource.h>
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#endif
2020

21-
/* Using an alternative stack requires sigaltstack()
22-
and sigaction() SA_ONSTACK */
23-
#if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION)
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# define FAULTHANDLER_USE_ALT_STACK
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#endif
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#if defined(FAULTHANDLER_USE_ALT_STACK) && defined(HAVE_LINUX_AUXVEC_H) && defined(HAVE_SYS_AUXV_H)
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# include <linux/auxvec.h> // AT_MINSIGSTKSZ
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# include <sys/auxv.h> // getauxval()
@@ -32,13 +26,6 @@
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/* Allocate at maximum 100 MiB of the stack to raise the stack overflow */
3327
#define STACK_OVERFLOW_MAX_SIZE (100 * 1024 * 1024)
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35-
#ifndef MS_WINDOWS
36-
/* register() is useless on Windows, because only SIGSEGV, SIGABRT and
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SIGILL can be handled by the process, and these signals can only be used
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with enable(), not using register() */
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# define FAULTHANDLER_USER
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#endif
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#define PUTS(fd, str) _Py_write_noraise(fd, str, strlen(str))
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4431

@@ -58,12 +45,6 @@
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#endif
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6047

61-
#ifdef HAVE_SIGACTION
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typedef struct sigaction _Py_sighandler_t;
63-
#else
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typedef PyOS_sighandler_t _Py_sighandler_t;
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#endif
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typedef struct {
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int signum;
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int enabled;
@@ -72,47 +53,12 @@ typedef struct {
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int all_threads;
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} fault_handler_t;
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75-
static struct {
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int enabled;
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PyObject *file;
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int fd;
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int all_threads;
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PyInterpreterState *interp;
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#ifdef MS_WINDOWS
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void *exc_handler;
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#endif
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} fatal_error = {0, NULL, -1, 0};
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static struct {
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PyObject *file;
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int fd;
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PY_TIMEOUT_T timeout_us; /* timeout in microseconds */
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int repeat;
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PyInterpreterState *interp;
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int exit;
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char *header;
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size_t header_len;
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/* The main thread always holds this lock. It is only released when
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faulthandler_thread() is interrupted before this thread exits, or at
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Python exit. */
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PyThread_type_lock cancel_event;
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/* released by child thread when joined */
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PyThread_type_lock running;
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} thread;
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#define fatal_error _PyRuntime.faulthandler.fatal_error
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#define thread _PyRuntime.faulthandler.thread
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#ifdef FAULTHANDLER_USER
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typedef struct {
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int enabled;
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PyObject *file;
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int fd;
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int all_threads;
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int chain;
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_Py_sighandler_t previous;
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PyInterpreterState *interp;
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} user_signal_t;
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static user_signal_t *user_signals;
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60+
#define user_signals _PyRuntime.faulthandler.user_signals
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typedef struct faulthandler_user_signal user_signal_t;
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static void faulthandler_user(int signum);
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#endif /* FAULTHANDLER_USER */
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@@ -134,8 +80,8 @@ static const size_t faulthandler_nsignals = \
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Py_ARRAY_LENGTH(faulthandler_handlers);
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13682
#ifdef FAULTHANDLER_USE_ALT_STACK
137-
static stack_t stack;
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static stack_t old_stack;
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# define stack _PyRuntime.faulthandler.stack
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# define old_stack _PyRuntime.faulthandler.old_stack
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#endif
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static PyObject *
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faulthandler_fatal_error_c_thread(PyObject *self, PyObject *args)
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{
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long thread;
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long tid;
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PyThread_type_lock lock;
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faulthandler_suppress_crash_report();
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11061052
PyThread_acquire_lock(lock, WAIT_LOCK);
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1108-
thread = PyThread_start_new_thread(faulthandler_fatal_error_thread, lock);
1109-
if (thread == -1) {
1054+
tid = PyThread_start_new_thread(faulthandler_fatal_error_thread, lock);
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if (tid == -1) {
11101056
PyThread_free_lock(lock);
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PyErr_SetString(PyExc_RuntimeError, "unable to start the thread");
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return NULL;

‎PCbuild/pythoncore.vcxproj

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<ClInclude Include="..\Include\internal\pycore_dict_state.h" />
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<ClInclude Include="..\Include\internal\pycore_dtoa.h" />
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<ClInclude Include="..\Include\internal\pycore_exceptions.h" />
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<ClInclude Include="..\Include\internal\pycore_faulthandler.h" />
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<ClInclude Include="..\Include\internal\pycore_fileutils.h" />
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<ClInclude Include="..\Include\internal\pycore_floatobject.h" />
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<ClInclude Include="..\Include\internal\pycore_format.h" />

‎PCbuild/pythoncore.vcxproj.filters

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<ClInclude Include="..\Include\internal\pycore_exceptions.h">
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<Filter>Include\internal</Filter>
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</ClInclude>
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<ClInclude Include="..\Include\internal\pycore_faulthandler.h">
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<Filter>Include\internal</Filter>
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</ClInclude>
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<ClInclude Include="..\Include\internal\pycore_fileutils.h">
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<Filter>Include\internal</Filter>
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</ClInclude>
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<ClInclude Include="..\Include\internal\pycore_format.h">
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<Filter>Include\internal</Filter>
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</ClInclude>
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<ClInclude Include="..\Include\internal\pycore_function.h">
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<Filter>Include\internal</Filter>
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</ClInclude>
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<ClInclude Include="..\Include\internal\pycore_gc.h">
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<Filter>Include\internal</Filter>
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</ClInclude>

‎Tools/c-analyzer/cpython/globals-to-fix.tsv

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Modules/itertoolsmodule.c - teedataobject_type -
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Modules/itertoolsmodule.c - ziplongest_type -
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##-----------------------
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## state
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Modules/faulthandler.c - fatal_error -
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Modules/faulthandler.c - thread -
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Modules/faulthandler.c - user_signals -
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Modules/faulthandler.c - stack -
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Modules/faulthandler.c - old_stack -
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##################################
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## global non-objects to fix in builtin modules
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##-----------------------
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## state
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Modules/faulthandler.c faulthandler_dump_traceback reentrant -
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Modules/signalmodule.c - is_tripped -
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Modules/signalmodule.c - signal_global_state -
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Modules/signalmodule.c - wakeup -

‎Tools/c-analyzer/cpython/ignored.tsv

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# thread-safety
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# XXX need race protection?
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Modules/faulthandler.c faulthandler_dump_traceback reentrant -
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Python/pylifecycle.c _Py_FatalErrorFormat reentrant -
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Python/pylifecycle.c fatal_error reentrant -
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