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5b222135f8
This affects the parser, various object implementations, and all places that put identifiers into C string literals. In testing, a number of crashes occurred as code would fail when the recursion limit was reached (such as the Unicode interning dictionary having key/value pairs where key is not value). To solve these, I added an overflowed flag, which allows for 50 more recursions after the limit was reached and the exception was raised, and a recursion_critical flag, which indicates that recursion absolutely must be allowed, i.e. that a certain call must not cause a stack overflow exception. There are still some places where both str and str8 are accepted as identifiers; these should eventually be removed.
200 lines
6.3 KiB
C
200 lines
6.3 KiB
C
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/* Thread and interpreter state structures and their interfaces */
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#ifndef Py_PYSTATE_H
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#define Py_PYSTATE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* State shared between threads */
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struct _ts; /* Forward */
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struct _is; /* Forward */
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typedef struct _is {
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struct _is *next;
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struct _ts *tstate_head;
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PyObject *modules;
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PyObject *sysdict;
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PyObject *builtins;
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PyObject *modules_reloading;
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PyObject *codec_search_path;
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PyObject *codec_search_cache;
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PyObject *codec_error_registry;
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#ifdef HAVE_DLOPEN
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int dlopenflags;
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#endif
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#ifdef WITH_TSC
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int tscdump;
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#endif
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} PyInterpreterState;
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/* State unique per thread */
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struct _frame; /* Avoid including frameobject.h */
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/* Py_tracefunc return -1 when raising an exception, or 0 for success. */
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typedef int (*Py_tracefunc)(PyObject *, struct _frame *, int, PyObject *);
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/* The following values are used for 'what' for tracefunc functions: */
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#define PyTrace_CALL 0
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#define PyTrace_EXCEPTION 1
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#define PyTrace_LINE 2
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#define PyTrace_RETURN 3
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#define PyTrace_C_CALL 4
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#define PyTrace_C_EXCEPTION 5
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#define PyTrace_C_RETURN 6
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typedef struct _ts {
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/* See Python/ceval.c for comments explaining most fields */
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struct _ts *next;
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PyInterpreterState *interp;
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struct _frame *frame;
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int recursion_depth;
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char overflowed; /* The stack has overflowed. Allow 50 more calls
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to handle the runtime error. */
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char recursion_critical; /* The current calls must not cause
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a stack overflow. */
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/* 'tracing' keeps track of the execution depth when tracing/profiling.
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This is to prevent the actual trace/profile code from being recorded in
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the trace/profile. */
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int tracing;
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int use_tracing;
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Py_tracefunc c_profilefunc;
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Py_tracefunc c_tracefunc;
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PyObject *c_profileobj;
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PyObject *c_traceobj;
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PyObject *curexc_type;
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PyObject *curexc_value;
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PyObject *curexc_traceback;
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PyObject *exc_type;
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PyObject *exc_value;
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PyObject *exc_traceback;
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PyObject *dict; /* Stores per-thread state */
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/* tick_counter is incremented whenever the check_interval ticker
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* reaches zero. The purpose is to give a useful measure of the number
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* of interpreted bytecode instructions in a given thread. This
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* extremely lightweight statistic collector may be of interest to
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* profilers (like psyco.jit()), although nothing in the core uses it.
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*/
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int tick_counter;
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int gilstate_counter;
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PyObject *async_exc; /* Asynchronous exception to raise */
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long thread_id; /* Thread id where this tstate was created */
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/* XXX signal handlers should also be here */
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} PyThreadState;
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PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_New(void);
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PyAPI_FUNC(void) PyInterpreterState_Clear(PyInterpreterState *);
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PyAPI_FUNC(void) PyInterpreterState_Delete(PyInterpreterState *);
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PyAPI_FUNC(PyThreadState *) PyThreadState_New(PyInterpreterState *);
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PyAPI_FUNC(void) PyThreadState_Clear(PyThreadState *);
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PyAPI_FUNC(void) PyThreadState_Delete(PyThreadState *);
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#ifdef WITH_THREAD
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PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void);
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#endif
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PyAPI_FUNC(PyThreadState *) PyThreadState_Get(void);
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PyAPI_FUNC(PyThreadState *) PyThreadState_Swap(PyThreadState *);
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PyAPI_FUNC(PyObject *) PyThreadState_GetDict(void);
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PyAPI_FUNC(int) PyThreadState_SetAsyncExc(long, PyObject *);
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/* Variable and macro for in-line access to current thread state */
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PyAPI_DATA(PyThreadState *) _PyThreadState_Current;
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#ifdef Py_DEBUG
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#define PyThreadState_GET() PyThreadState_Get()
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#else
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#define PyThreadState_GET() (_PyThreadState_Current)
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#endif
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typedef
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enum {PyGILState_LOCKED, PyGILState_UNLOCKED}
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PyGILState_STATE;
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/* Ensure that the current thread is ready to call the Python
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C API, regardless of the current state of Python, or of its
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thread lock. This may be called as many times as desired
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by a thread so long as each call is matched with a call to
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PyGILState_Release(). In general, other thread-state APIs may
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be used between _Ensure() and _Release() calls, so long as the
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thread-state is restored to its previous state before the Release().
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For example, normal use of the Py_BEGIN_ALLOW_THREADS/
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Py_END_ALLOW_THREADS macros are acceptable.
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The return value is an opaque "handle" to the thread state when
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PyGILState_Ensure() was called, and must be passed to
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PyGILState_Release() to ensure Python is left in the same state. Even
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though recursive calls are allowed, these handles can *not* be shared -
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each unique call to PyGILState_Ensure must save the handle for its
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call to PyGILState_Release.
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When the function returns, the current thread will hold the GIL.
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Failure is a fatal error.
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*/
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PyAPI_FUNC(PyGILState_STATE) PyGILState_Ensure(void);
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/* Release any resources previously acquired. After this call, Python's
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state will be the same as it was prior to the corresponding
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PyGILState_Ensure() call (but generally this state will be unknown to
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the caller, hence the use of the GILState API.)
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Every call to PyGILState_Ensure must be matched by a call to
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PyGILState_Release on the same thread.
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*/
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PyAPI_FUNC(void) PyGILState_Release(PyGILState_STATE);
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/* Helper/diagnostic function - get the current thread state for
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this thread. May return NULL if no GILState API has been used
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on the current thread. Note the main thread always has such a
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thread-state, even if no auto-thread-state call has been made
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on the main thread.
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*/
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PyAPI_FUNC(PyThreadState *) PyGILState_GetThisThreadState(void);
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/* The implementation of sys._current_frames() Returns a dict mapping
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thread id to that thread's current frame.
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*/
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PyAPI_FUNC(PyObject *) _PyThread_CurrentFrames(void);
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/* Routines for advanced debuggers, requested by David Beazley.
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Don't use unless you know what you are doing! */
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PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Head(void);
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PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Next(PyInterpreterState *);
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PyAPI_FUNC(PyThreadState *) PyInterpreterState_ThreadHead(PyInterpreterState *);
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PyAPI_FUNC(PyThreadState *) PyThreadState_Next(PyThreadState *);
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typedef struct _frame *(*PyThreadFrameGetter)(PyThreadState *self_);
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/* hook for PyEval_GetFrame(), requested for Psyco */
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PyAPI_DATA(PyThreadFrameGetter) _PyThreadState_GetFrame;
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_PYSTATE_H */
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