Showing content from http://svn.python.org/projects/python/branches/r22b2-branch/Python/ceval.c below:
/* Execute compiled code */ /* XXX TO DO: XXX speed up searching for keywords by using a dictionary XXX document it! */ #include "Python.h" #include "compile.h" #include "frameobject.h" #include "eval.h" #include "opcode.h" #include "structmember.h" #ifdef macintosh #include "macglue.h" #endif #include /* Turn this on if your compiler chokes on the big switch: */ /* #define CASE_TOO_BIG 1 */ #ifdef Py_DEBUG /* For debugging the interpreter: */ #define LLTRACE 1 /* Low-level trace feature */ #define CHECKEXC 1 /* Double-check exception checking */ #endif typedef PyObject *(*callproc)(PyObject *, PyObject *, PyObject *); /* Forward declarations */ static PyObject *eval_frame(PyFrameObject *); static PyObject *fast_function(PyObject *, PyObject ***, int, int, int); static PyObject *fast_cfunction(PyObject *, PyObject ***, int); static PyObject *do_call(PyObject *, PyObject ***, int, int); static PyObject *ext_do_call(PyObject *, PyObject ***, int, int, int); static PyObject *update_keyword_args(PyObject *, int, PyObject ***,PyObject *); static PyObject *update_star_args(int, int, PyObject *, PyObject ***); static PyObject *load_args(PyObject ***, int); #define CALL_FLAG_VAR 1 #define CALL_FLAG_KW 2 #ifdef LLTRACE static int prtrace(PyObject *, char *); #endif static int call_trace(Py_tracefunc, PyObject *, PyFrameObject *, int, PyObject *); static void call_trace_protected(Py_tracefunc, PyObject *, PyFrameObject *, int); static void call_exc_trace(Py_tracefunc, PyObject *, PyFrameObject *); static PyObject *loop_subscript(PyObject *, PyObject *); static PyObject *apply_slice(PyObject *, PyObject *, PyObject *); static int assign_slice(PyObject *, PyObject *, PyObject *, PyObject *); static PyObject *cmp_outcome(int, PyObject *, PyObject *); static PyObject *import_from(PyObject *, PyObject *); static int import_all_from(PyObject *, PyObject *); static PyObject *build_class(PyObject *, PyObject *, PyObject *); static int exec_statement(PyFrameObject *, PyObject *, PyObject *, PyObject *); static void set_exc_info(PyThreadState *, PyObject *, PyObject *, PyObject *); static void reset_exc_info(PyThreadState *); static void format_exc_check_arg(PyObject *, char *, PyObject *); #define NAME_ERROR_MSG \ "name '%.200s' is not defined" #define GLOBAL_NAME_ERROR_MSG \ "global name '%.200s' is not defined" #define UNBOUNDLOCAL_ERROR_MSG \ "local variable '%.200s' referenced before assignment" #define UNBOUNDFREE_ERROR_MSG \ "free variable '%.200s' referenced before assignment" \ " in enclosing scope" /* Dynamic execution profile */ #ifdef DYNAMIC_EXECUTION_PROFILE #ifdef DXPAIRS static long dxpairs[257][256]; #define dxp dxpairs[256] #else static long dxp[256]; #endif #endif staticforward PyTypeObject gentype; typedef struct { PyObject_HEAD /* The gi_ prefix is intended to remind of generator-iterator. */ PyFrameObject *gi_frame; /* True if generator is being executed. */ int gi_running; } genobject; static PyObject * gen_new(PyFrameObject *f) { genobject *gen = PyObject_New(genobject, &gentype); if (gen == NULL) { Py_DECREF(f); return NULL; } gen->gi_frame = f; gen->gi_running = 0; PyObject_GC_Init(gen); return (PyObject *)gen; } static int gen_traverse(genobject *gen, visitproc visit, void *arg) { return visit((PyObject *)gen->gi_frame, arg); } static void gen_dealloc(genobject *gen) { PyObject_GC_Fini(gen); Py_DECREF(gen->gi_frame); PyObject_Del(gen); } static PyObject * gen_iternext(genobject *gen) { PyThreadState *tstate = PyThreadState_GET(); PyFrameObject *f = gen->gi_frame; PyObject *result; if (gen->gi_running) { PyErr_SetString(PyExc_ValueError, "generator already executing"); return NULL; } if (f->f_stacktop == NULL) return NULL; /* Generators always return to their most recent caller, not * necessarily their creator. */ Py_XINCREF(tstate->frame); assert(f->f_back == NULL); f->f_back = tstate->frame; gen->gi_running = 1; result = eval_frame(f); gen->gi_running = 0; /* Don't keep the reference to f_back any longer than necessary. It * may keep a chain of frames alive or it could create a reference * cycle. */ Py_XDECREF(f->f_back); f->f_back = NULL; /* If the generator just returned (as opposed to yielding), signal * that the generator is exhausted. */ if (result == Py_None && f->f_stacktop == NULL) { Py_DECREF(result); result = NULL; } return result; } static PyObject * gen_next(genobject *gen) { PyObject *result; result = gen_iternext(gen); if (result == NULL && !PyErr_Occurred()) { PyErr_SetObject(PyExc_StopIteration, Py_None); return NULL; } return result; } static PyObject * gen_getiter(PyObject *gen) { Py_INCREF(gen); return gen; } static struct PyMethodDef gen_methods[] = { {"next", (PyCFunction)gen_next, METH_NOARGS, "next() -- get the next value, or raise StopIteration"}, {NULL, NULL} /* Sentinel */ }; static PyMemberDef gen_memberlist[] = { {"gi_frame", T_OBJECT, offsetof(genobject, gi_frame), RO}, {"gi_running", T_INT, offsetof(genobject, gi_running), RO}, {NULL} /* Sentinel */ }; statichere PyTypeObject gentype = { PyObject_HEAD_INIT(&PyType_Type) 0, /* ob_size */ "generator", /* tp_name */ sizeof(genobject) + PyGC_HEAD_SIZE, /* tp_basicsize */ 0, /* tp_itemsize */ /* methods */ (destructor)gen_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_compare */ 0, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ 0, /* tp_call */ 0, /* tp_str */ PyObject_GenericGetAttr, /* tp_getattro */ 0, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */ 0, /* tp_doc */ (traverseproc)gen_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ (getiterfunc)gen_getiter, /* tp_iter */ (iternextfunc)gen_iternext, /* tp_iternext */ gen_methods, /* tp_methods */ gen_memberlist, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ }; #ifdef WITH_THREAD #ifndef DONT_HAVE_ERRNO_H #include #endif #include "pythread.h" extern int _PyThread_Started; /* Flag for Py_Exit */ static PyThread_type_lock interpreter_lock = 0; static long main_thread = 0; void PyEval_InitThreads(void) { if (interpreter_lock) return; _PyThread_Started = 1; interpreter_lock = PyThread_allocate_lock(); PyThread_acquire_lock(interpreter_lock, 1); main_thread = PyThread_get_thread_ident(); } void PyEval_AcquireLock(void) { PyThread_acquire_lock(interpreter_lock, 1); } void PyEval_ReleaseLock(void) { PyThread_release_lock(interpreter_lock); } void PyEval_AcquireThread(PyThreadState *tstate) { if (tstate == NULL) Py_FatalError("PyEval_AcquireThread: NULL new thread state"); PyThread_acquire_lock(interpreter_lock, 1); if (PyThreadState_Swap(tstate) != NULL) Py_FatalError( "PyEval_AcquireThread: non-NULL old thread state"); } void PyEval_ReleaseThread(PyThreadState *tstate) { if (tstate == NULL) Py_FatalError("PyEval_ReleaseThread: NULL thread state"); if (PyThreadState_Swap(NULL) != tstate) Py_FatalError("PyEval_ReleaseThread: wrong thread state"); PyThread_release_lock(interpreter_lock); } /* This function is called from PyOS_AfterFork to ensure that newly created child processes don't hold locks referring to threads which are not running in the child process. (This could also be done using pthread_atfork mechanism, at least for the pthreads implementation.) */ void PyEval_ReInitThreads(void) { if (!interpreter_lock) return; /*XXX Can't use PyThread_free_lock here because it does too much error-checking. Doing this cleanly would require adding a new function to each thread_*.h. Instead, just create a new lock and waste a little bit of memory */ interpreter_lock = PyThread_allocate_lock(); PyThread_acquire_lock(interpreter_lock, 1); main_thread = PyThread_get_thread_ident(); } #endif /* Functions save_thread and restore_thread are always defined so dynamically loaded modules needn't be compiled separately for use with and without threads: */ PyThreadState * PyEval_SaveThread(void) { PyThreadState *tstate = PyThreadState_Swap(NULL); if (tstate == NULL) Py_FatalError("PyEval_SaveThread: NULL tstate"); #ifdef WITH_THREAD if (interpreter_lock) PyThread_release_lock(interpreter_lock); #endif return tstate; } void PyEval_RestoreThread(PyThreadState *tstate) { if (tstate == NULL) Py_FatalError("PyEval_RestoreThread: NULL tstate"); #ifdef WITH_THREAD if (interpreter_lock) { int err = errno; PyThread_acquire_lock(interpreter_lock, 1); errno = err; } #endif PyThreadState_Swap(tstate); } /* Mechanism whereby asynchronously executing callbacks (e.g. UNIX signal handlers or Mac I/O completion routines) can schedule calls to a function to be called synchronously. The synchronous function is called with one void* argument. It should return 0 for success or -1 for failure -- failure should be accompanied by an exception. If registry succeeds, the registry function returns 0; if it fails (e.g. due to too many pending calls) it returns -1 (without setting an exception condition). Note that because registry may occur from within signal handlers, or other asynchronous events, calling malloc() is unsafe! #ifdef WITH_THREAD Any thread can schedule pending calls, but only the main thread will execute them. #endif XXX WARNING! ASYNCHRONOUSLY EXECUTING CODE! There are two possible race conditions: (1) nested asynchronous registry calls; (2) registry calls made while pending calls are being processed. While (1) is very unlikely, (2) is a real possibility. The current code is safe against (2), but not against (1). The safety against (2) is derived from the fact that only one thread (the main thread) ever takes things out of the queue. XXX Darn! With the advent of thread state, we should have an array of pending calls per thread in the thread state! Later... */ #define NPENDINGCALLS 32 static struct { int (*func)(void *); void *arg; } pendingcalls[NPENDINGCALLS]; static volatile int pendingfirst = 0; static volatile int pendinglast = 0; static volatile int things_to_do = 0; int Py_AddPendingCall(int (*func)(void *), void *arg) { static int busy = 0; int i, j; /* XXX Begin critical section */ /* XXX If you want this to be safe against nested XXX asynchronous calls, you'll have to work harder! */ if (busy) return -1; busy = 1; i = pendinglast; j = (i + 1) % NPENDINGCALLS; if (j == pendingfirst) return -1; /* Queue full */ pendingcalls[i].func = func; pendingcalls[i].arg = arg; pendinglast = j; things_to_do = 1; /* Signal main loop */ busy = 0; /* XXX End critical section */ return 0; } int Py_MakePendingCalls(void) { static int busy = 0; #ifdef WITH_THREAD if (main_thread && PyThread_get_thread_ident() != main_thread) return 0; #endif if (busy) return 0; busy = 1; things_to_do = 0; for (;;) { int i; int (*func)(void *); void *arg; i = pendingfirst; if (i == pendinglast) break; /* Queue empty */ func = pendingcalls[i].func; arg = pendingcalls[i].arg; pendingfirst = (i + 1) % NPENDINGCALLS; if (func(arg) < 0) { busy = 0; things_to_do = 1; /* We're not done yet */ return -1; } } busy = 0; return 0; } /* The interpreter's recursion limit */ static int recursion_limit = 1000; int Py_GetRecursionLimit(void) { return recursion_limit; } void Py_SetRecursionLimit(int new_limit) { recursion_limit = new_limit; } /* Status code for main loop (reason for stack unwind) */ enum why_code { WHY_NOT, /* No error */ WHY_EXCEPTION, /* Exception occurred */ WHY_RERAISE, /* Exception re-raised by 'finally' */ WHY_RETURN, /* 'return' statement */ WHY_BREAK, /* 'break' statement */ WHY_CONTINUE, /* 'continue' statement */ WHY_YIELD /* 'yield' operator */ }; static enum why_code do_raise(PyObject *, PyObject *, PyObject *); static int unpack_iterable(PyObject *, int, PyObject **); PyObject * PyEval_EvalCode(PyCodeObject *co, PyObject *globals, PyObject *locals) { return PyEval_EvalCodeEx(co, globals, locals, (PyObject **)NULL, 0, (PyObject **)NULL, 0, (PyObject **)NULL, 0, NULL); } /* Interpreter main loop */ static PyObject * eval_frame(PyFrameObject *f) { #ifdef DXPAIRS int lastopcode = 0; #endif PyObject **stack_pointer; register unsigned char *next_instr; register int opcode=0; /* Current opcode */ register int oparg=0; /* Current opcode argument, if any */ register enum why_code why; /* Reason for block stack unwind */ register int err; /* Error status -- nonzero if error */ register PyObject *x; /* Result object -- NULL if error */ register PyObject *v; /* Temporary objects popped off stack */ register PyObject *w; register PyObject *u; register PyObject *t; register PyObject *stream = NULL; /* for PRINT opcodes */ register PyObject **fastlocals, **freevars; PyObject *retval = NULL; /* Return value */ PyThreadState *tstate = PyThreadState_GET(); PyCodeObject *co; unsigned char *first_instr; #ifdef LLTRACE int lltrace; #endif #if defined(Py_DEBUG) || defined(LLTRACE) /* Make it easier to find out where we are with a debugger */ char *filename; #endif /* Code access macros */ #define GETCONST(i) Getconst(f, i) #define GETNAME(i) Getname(f, i) #define GETNAMEV(i) Getnamev(f, i) #define INSTR_OFFSET() (next_instr - first_instr) #define NEXTOP() (*next_instr++) #define NEXTARG() (next_instr += 2, (next_instr[-1]<<8) + next_instr[-2]) #define JUMPTO(x) (next_instr = first_instr + (x)) #define JUMPBY(x) (next_instr += (x)) /* Stack manipulation macros */ #define STACK_LEVEL() (stack_pointer - f->f_valuestack) #define EMPTY() (STACK_LEVEL() == 0) #define TOP() (stack_pointer[-1]) #define BASIC_PUSH(v) (*stack_pointer++ = (v)) #define BASIC_POP() (*--stack_pointer) #ifdef LLTRACE #define PUSH(v) { (void)(BASIC_PUSH(v), \ lltrace && prtrace(TOP(), "push")); \ assert(STACK_LEVEL() <= f->f_stacksize); } #define POP() ((void)(lltrace && prtrace(TOP(), "pop")), BASIC_POP()) #else #define PUSH(v) BASIC_PUSH(v) #define POP() BASIC_POP() #endif /* Local variable macros */ #define GETLOCAL(i) (fastlocals[i]) #define SETLOCAL(i, value) do { Py_XDECREF(GETLOCAL(i)); \ GETLOCAL(i) = value; } while (0) /* Start of code */ if (f == NULL) return NULL; #ifdef USE_STACKCHECK if (tstate->recursion_depth%10 == 0 && PyOS_CheckStack()) { PyErr_SetString(PyExc_MemoryError, "Stack overflow"); return NULL; } #endif /* push frame */ if (++tstate->recursion_depth > recursion_limit) { --tstate->recursion_depth; PyErr_SetString(PyExc_RuntimeError, "maximum recursion depth exceeded"); tstate->frame = f->f_back; return NULL; } tstate->frame = f; co = f->f_code; fastlocals = f->f_localsplus; freevars = f->f_localsplus + f->f_nlocals; _PyCode_GETCODEPTR(co, &first_instr); next_instr = first_instr + f->f_lasti; stack_pointer = f->f_stacktop; assert(stack_pointer != NULL); f->f_stacktop = NULL; if (tstate->use_tracing) { if (tstate->c_tracefunc != NULL) { /* tstate->c_tracefunc, if defined, is a function that will be called on *every* entry to a code block. Its return value, if not None, is a function that will be called at the start of each executed line of code. (Actually, the function must return itself in order to continue tracing.) The trace functions are called with three arguments: a pointer to the current frame, a string indicating why the function is called, and an argument which depends on the situation. The global trace function is also called whenever an exception is detected. */ if (call_trace(tstate->c_tracefunc, tstate->c_traceobj, f, PyTrace_CALL, Py_None)) { /* Trace function raised an error */ return NULL; } } if (tstate->c_profilefunc != NULL) { /* Similar for c_profilefunc, except it needn't return itself and isn't called for "line" events */ if (call_trace(tstate->c_profilefunc, tstate->c_profileobj, f, PyTrace_CALL, Py_None)) { /* Profile function raised an error */ return NULL; } } } #ifdef LLTRACE lltrace = PyDict_GetItemString(f->f_globals,"__lltrace__") != NULL; #endif #if defined(Py_DEBUG) || defined(LLTRACE) filename = PyString_AsString(co->co_filename); #endif why = WHY_NOT; err = 0; x = Py_None; /* Not a reference, just anything non-NULL */ w = NULL; for (;;) { /* Do periodic things. Doing this every time through the loop would add too much overhead, so we do it only every Nth instruction. We also do it if ``things_to_do'' is set, i.e. when an asynchronous event needs attention (e.g. a signal handler or async I/O handler); see Py_AddPendingCall() and Py_MakePendingCalls() above. */ if (things_to_do || --tstate->ticker < 0) { tstate->ticker = tstate->interp->checkinterval; if (things_to_do) { if (Py_MakePendingCalls() < 0) { why = WHY_EXCEPTION; goto on_error; } } #if !defined(HAVE_SIGNAL_H) || defined(macintosh) /* If we have true signals, the signal handler will call Py_AddPendingCall() so we don't have to call sigcheck(). On the Mac and DOS, alas, we have to call it. */ if (PyErr_CheckSignals()) { why = WHY_EXCEPTION; goto on_error; } #endif #ifdef WITH_THREAD if (interpreter_lock) { /* Give another thread a chance */ if (PyThreadState_Swap(NULL) != tstate) Py_FatalError("ceval: tstate mix-up"); PyThread_release_lock(interpreter_lock); /* Other threads may run now */ PyThread_acquire_lock(interpreter_lock, 1); if (PyThreadState_Swap(tstate) != NULL) Py_FatalError("ceval: orphan tstate"); } #endif } /* Extract opcode and argument */ #if defined(Py_DEBUG) || defined(LLTRACE) f->f_lasti = INSTR_OFFSET(); #endif opcode = NEXTOP(); if (HAS_ARG(opcode)) oparg = NEXTARG(); dispatch_opcode: #ifdef DYNAMIC_EXECUTION_PROFILE #ifdef DXPAIRS dxpairs[lastopcode][opcode]++; lastopcode = opcode; #endif dxp[opcode]++; #endif #ifdef LLTRACE /* Instruction tracing */ if (lltrace) { if (HAS_ARG(opcode)) { printf("%d: %d, %d\n", (int) (INSTR_OFFSET() - 3), opcode, oparg); } else { printf("%d: %d\n", (int) (INSTR_OFFSET() - 1), opcode); } } #endif /* Main switch on opcode */ switch (opcode) { /* BEWARE! It is essential that any operation that fails sets either x to NULL, err to nonzero, or why to anything but WHY_NOT, and that no operation that succeeds does this! */ /* case STOP_CODE: this is an error! */ case POP_TOP: v = POP(); Py_DECREF(v); continue; case ROT_TWO: v = POP(); w = POP(); PUSH(v); PUSH(w); continue; case ROT_THREE: v = POP(); w = POP(); x = POP(); PUSH(v); PUSH(x); PUSH(w); continue; case ROT_FOUR: u = POP(); v = POP(); w = POP(); x = POP(); PUSH(u); PUSH(x); PUSH(w); PUSH(v); continue; case DUP_TOP: v = TOP(); Py_INCREF(v); PUSH(v); continue; case DUP_TOPX: switch (oparg) { case 1: x = TOP(); Py_INCREF(x); PUSH(x); continue; case 2: x = POP(); Py_INCREF(x); w = TOP(); Py_INCREF(w); PUSH(x); PUSH(w); PUSH(x); continue; case 3: x = POP(); Py_INCREF(x); w = POP(); Py_INCREF(w); v = TOP(); Py_INCREF(v); PUSH(w); PUSH(x); PUSH(v); PUSH(w); PUSH(x); continue; case 4: x = POP(); Py_INCREF(x); w = POP(); Py_INCREF(w); v = POP(); Py_INCREF(v); u = TOP(); Py_INCREF(u); PUSH(v); PUSH(w); PUSH(x); PUSH(u); PUSH(v); PUSH(w); PUSH(x); continue; case 5: x = POP(); Py_INCREF(x); w = POP(); Py_INCREF(w); v = POP(); Py_INCREF(v); u = POP(); Py_INCREF(u); t = TOP(); Py_INCREF(t); PUSH(u); PUSH(v); PUSH(w); PUSH(x); PUSH(t); PUSH(u); PUSH(v); PUSH(w); PUSH(x); continue; default: Py_FatalError("invalid argument to DUP_TOPX" " (bytecode corruption?)"); } break; case UNARY_POSITIVE: v = POP(); x = PyNumber_Positive(v); Py_DECREF(v); PUSH(x); if (x != NULL) continue; break; case UNARY_NEGATIVE: v = POP(); x = PyNumber_Negative(v); Py_DECREF(v); PUSH(x); if (x != NULL) continue; break; case UNARY_NOT: v = POP(); err = PyObject_IsTrue(v); Py_DECREF(v); if (err == 0) { Py_INCREF(Py_True); PUSH(Py_True); continue; } else if (err > 0) { Py_INCREF(Py_False); PUSH(Py_False); err = 0; continue; } break; case UNARY_CONVERT: v = POP(); x = PyObject_Repr(v); Py_DECREF(v); PUSH(x); if (x != NULL) continue; break; case UNARY_INVERT: v = POP(); x = PyNumber_Invert(v); Py_DECREF(v); PUSH(x); if (x != NULL) continue; break; case BINARY_POWER: w = POP(); v = POP(); x = PyNumber_Power(v, w, Py_None); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_MULTIPLY: w = POP(); v = POP(); x = PyNumber_Multiply(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_DIVIDE: w = POP(); v = POP(); x = PyNumber_Divide(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_FLOOR_DIVIDE: w = POP(); v = POP(); x = PyNumber_FloorDivide(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_TRUE_DIVIDE: w = POP(); v = POP(); x = PyNumber_TrueDivide(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_MODULO: w = POP(); v = POP(); x = PyNumber_Remainder(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_ADD: w = POP(); v = POP(); if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) { /* INLINE: int + int */ register long a, b, i; a = PyInt_AS_LONG(v); b = PyInt_AS_LONG(w); i = a + b; if ((i^a) < 0 && (i^b) < 0) goto slow_add; x = PyInt_FromLong(i); } else { slow_add: x = PyNumber_Add(v, w); } Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_SUBTRACT: w = POP(); v = POP(); if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) { /* INLINE: int - int */ register long a, b, i; a = PyInt_AS_LONG(v); b = PyInt_AS_LONG(w); i = a - b; if ((i^a) < 0 && (i^~b) < 0) goto slow_sub; x = PyInt_FromLong(i); } else { slow_sub: x = PyNumber_Subtract(v, w); } Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_SUBSCR: w = POP(); v = POP(); if (PyList_CheckExact(v) && PyInt_CheckExact(w)) { /* INLINE: list[int] */ long i = PyInt_AsLong(w); if (i < 0) i += PyList_GET_SIZE(v); if (i < 0 || i >= PyList_GET_SIZE(v)) { PyErr_SetString(PyExc_IndexError, "list index out of range"); x = NULL; } else { x = PyList_GET_ITEM(v, i); Py_INCREF(x); } } else x = PyObject_GetItem(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_LSHIFT: w = POP(); v = POP(); x = PyNumber_Lshift(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_RSHIFT: w = POP(); v = POP(); x = PyNumber_Rshift(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_AND: w = POP(); v = POP(); x = PyNumber_And(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_XOR: w = POP(); v = POP(); x = PyNumber_Xor(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case BINARY_OR: w = POP(); v = POP(); x = PyNumber_Or(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_POWER: w = POP(); v = POP(); x = PyNumber_InPlacePower(v, w, Py_None); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_MULTIPLY: w = POP(); v = POP(); x = PyNumber_InPlaceMultiply(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_DIVIDE: w = POP(); v = POP(); x = PyNumber_InPlaceDivide(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_FLOOR_DIVIDE: w = POP(); v = POP(); x = PyNumber_InPlaceFloorDivide(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_TRUE_DIVIDE: w = POP(); v = POP(); x = PyNumber_InPlaceTrueDivide(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_MODULO: w = POP(); v = POP(); x = PyNumber_InPlaceRemainder(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_ADD: w = POP(); v = POP(); if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) { /* INLINE: int + int */ register long a, b, i; a = PyInt_AS_LONG(v); b = PyInt_AS_LONG(w); i = a + b; if ((i^a) < 0 && (i^b) < 0) goto slow_iadd; x = PyInt_FromLong(i); } else { slow_iadd: x = PyNumber_InPlaceAdd(v, w); } Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_SUBTRACT: w = POP(); v = POP(); if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) { /* INLINE: int - int */ register long a, b, i; a = PyInt_AS_LONG(v); b = PyInt_AS_LONG(w); i = a - b; if ((i^a) < 0 && (i^~b) < 0) goto slow_isub; x = PyInt_FromLong(i); } else { slow_isub: x = PyNumber_InPlaceSubtract(v, w); } Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_LSHIFT: w = POP(); v = POP(); x = PyNumber_InPlaceLshift(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_RSHIFT: w = POP(); v = POP(); x = PyNumber_InPlaceRshift(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_AND: w = POP(); v = POP(); x = PyNumber_InPlaceAnd(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_XOR: w = POP(); v = POP(); x = PyNumber_InPlaceXor(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case INPLACE_OR: w = POP(); v = POP(); x = PyNumber_InPlaceOr(v, w); Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case SLICE+0: case SLICE+1: case SLICE+2: case SLICE+3: if ((opcode-SLICE) & 2) w = POP(); else w = NULL; if ((opcode-SLICE) & 1) v = POP(); else v = NULL; u = POP(); x = apply_slice(u, v, w); Py_DECREF(u); Py_XDECREF(v); Py_XDECREF(w); PUSH(x); if (x != NULL) continue; break; case STORE_SLICE+0: case STORE_SLICE+1: case STORE_SLICE+2: case STORE_SLICE+3: if ((opcode-STORE_SLICE) & 2) w = POP(); else w = NULL; if ((opcode-STORE_SLICE) & 1) v = POP(); else v = NULL; u = POP(); t = POP(); err = assign_slice(u, v, w, t); /* u[v:w] = t */ Py_DECREF(t); Py_DECREF(u); Py_XDECREF(v); Py_XDECREF(w); if (err == 0) continue; break; case DELETE_SLICE+0: case DELETE_SLICE+1: case DELETE_SLICE+2: case DELETE_SLICE+3: if ((opcode-DELETE_SLICE) & 2) w = POP(); else w = NULL; if ((opcode-DELETE_SLICE) & 1) v = POP(); else v = NULL; u = POP(); err = assign_slice(u, v, w, (PyObject *)NULL); /* del u[v:w] */ Py_DECREF(u); Py_XDECREF(v); Py_XDECREF(w); if (err == 0) continue; break; case STORE_SUBSCR: w = POP(); v = POP(); u = POP(); /* v[w] = u */ err = PyObject_SetItem(v, w, u); Py_DECREF(u); Py_DECREF(v); Py_DECREF(w); if (err == 0) continue; break; case DELETE_SUBSCR: w = POP(); v = POP(); /* del v[w] */ err = PyObject_DelItem(v, w); Py_DECREF(v); Py_DECREF(w); if (err == 0) continue; break; case PRINT_EXPR: v = POP(); w = PySys_GetObject("displayhook"); if (w == NULL) { PyErr_SetString(PyExc_RuntimeError, "lost sys.displayhook"); err = -1; x = NULL; } if (err == 0) { x = Py_BuildValue("(O)", v); if (x == NULL) err = -1; } if (err == 0) { w = PyEval_CallObject(w, x); Py_XDECREF(w); if (w == NULL) err = -1; } Py_DECREF(v); Py_XDECREF(x); break; case PRINT_ITEM_TO: w = stream = POP(); /* fall through to PRINT_ITEM */ case PRINT_ITEM: v = POP(); if (stream == NULL || stream == Py_None) { w = PySys_GetObject("stdout"); if (w == NULL) { PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout"); err = -1; } } if (w != NULL && PyFile_SoftSpace(w, 1)) err = PyFile_WriteString(" ", w); if (err == 0) err = PyFile_WriteObject(v, w, Py_PRINT_RAW); if (err == 0 && PyString_Check(v)) { /* XXX move into writeobject() ? */ char *s = PyString_AsString(v); int len = PyString_Size(v); if (len > 0 && isspace(Py_CHARMASK(s[len-1])) && s[len-1] != ' ') PyFile_SoftSpace(w, 0); } Py_DECREF(v); Py_XDECREF(stream); stream = NULL; if (err == 0) continue; break; case PRINT_NEWLINE_TO: w = stream = POP(); /* fall through to PRINT_NEWLINE */ case PRINT_NEWLINE: if (stream == NULL || stream == Py_None) { w = PySys_GetObject("stdout"); if (w == NULL) PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout"); } if (w != NULL) { err = PyFile_WriteString("\n", w); if (err == 0) PyFile_SoftSpace(w, 0); } Py_XDECREF(stream); stream = NULL; break; #ifdef CASE_TOO_BIG default: switch (opcode) { #endif case BREAK_LOOP: why = WHY_BREAK; break; case CONTINUE_LOOP: retval = PyInt_FromLong(oparg); why = WHY_CONTINUE; break; case RAISE_VARARGS: u = v = w = NULL; switch (oparg) { case 3: u = POP(); /* traceback */ /* Fallthrough */ case 2: v = POP(); /* value */ /* Fallthrough */ case 1: w = POP(); /* exc */ case 0: /* Fallthrough */ why = do_raise(w, v, u); break; default: PyErr_SetString(PyExc_SystemError, "bad RAISE_VARARGS oparg"); why = WHY_EXCEPTION; break; } break; case LOAD_LOCALS: if ((x = f->f_locals) == NULL) { PyErr_SetString(PyExc_SystemError, "no locals"); break; } Py_INCREF(x); PUSH(x); break; case RETURN_VALUE: retval = POP(); why = WHY_RETURN; break; case YIELD_VALUE: retval = POP(); f->f_stacktop = stack_pointer; f->f_lasti = INSTR_OFFSET(); why = WHY_YIELD; break; case EXEC_STMT: w = POP(); v = POP(); u = POP(); err = exec_statement(f, u, v, w); Py_DECREF(u); Py_DECREF(v); Py_DECREF(w); break; case POP_BLOCK: { PyTryBlock *b = PyFrame_BlockPop(f); while (STACK_LEVEL() > b->b_level) { v = POP(); Py_DECREF(v); } } break; case END_FINALLY: v = POP(); if (PyInt_Check(v)) { why = (enum why_code) PyInt_AsLong(v); if (why == WHY_RETURN || why == WHY_YIELD || why == CONTINUE_LOOP) retval = POP(); } else if (PyString_Check(v) || PyClass_Check(v)) { w = POP(); u = POP(); PyErr_Restore(v, w, u); why = WHY_RERAISE; break; } else if (v != Py_None) { PyErr_SetString(PyExc_SystemError, "'finally' pops bad exception"); why = WHY_EXCEPTION; } Py_DECREF(v); break; case BUILD_CLASS: u = POP(); v = POP(); w = POP(); x = build_class(u, v, w); PUSH(x); Py_DECREF(u); Py_DECREF(v); Py_DECREF(w); break; case STORE_NAME: w = GETNAMEV(oparg); v = POP(); if ((x = f->f_locals) == NULL) { PyErr_Format(PyExc_SystemError, "no locals found when storing %s", PyObject_REPR(w)); break; } err = PyDict_SetItem(x, w, v); Py_DECREF(v); break; case DELETE_NAME: w = GETNAMEV(oparg); if ((x = f->f_locals) == NULL) { PyErr_Format(PyExc_SystemError, "no locals when deleting %s", PyObject_REPR(w)); break; } if ((err = PyDict_DelItem(x, w)) != 0) format_exc_check_arg(PyExc_NameError, NAME_ERROR_MSG ,w); break; case UNPACK_SEQUENCE: v = POP(); if (PyTuple_Check(v)) { if (PyTuple_Size(v) != oparg) { PyErr_SetString(PyExc_ValueError, "unpack tuple of wrong size"); why = WHY_EXCEPTION; } else { for (; --oparg >= 0; ) { w = PyTuple_GET_ITEM(v, oparg); Py_INCREF(w); PUSH(w); } } } else if (PyList_Check(v)) { if (PyList_Size(v) != oparg) { PyErr_SetString(PyExc_ValueError, "unpack list of wrong size"); why = WHY_EXCEPTION; } else { for (; --oparg >= 0; ) { w = PyList_GET_ITEM(v, oparg); Py_INCREF(w); PUSH(w); } } } else if (unpack_iterable(v, oparg, stack_pointer + oparg)) stack_pointer += oparg; else { if (PyErr_ExceptionMatches(PyExc_TypeError)) PyErr_SetString(PyExc_TypeError, "unpack non-sequence"); why = WHY_EXCEPTION; } Py_DECREF(v); break; case STORE_ATTR: w = GETNAMEV(oparg); v = POP(); u = POP(); err = PyObject_SetAttr(v, w, u); /* v.w = u */ Py_DECREF(v); Py_DECREF(u); break; case DELETE_ATTR: w = GETNAMEV(oparg); v = POP(); err = PyObject_SetAttr(v, w, (PyObject *)NULL); /* del v.w */ Py_DECREF(v); break; case STORE_GLOBAL: w = GETNAMEV(oparg); v = POP(); err = PyDict_SetItem(f->f_globals, w, v); Py_DECREF(v); break; case DELETE_GLOBAL: w = GETNAMEV(oparg); if ((err = PyDict_DelItem(f->f_globals, w)) != 0) format_exc_check_arg( PyExc_NameError, GLOBAL_NAME_ERROR_MSG, w); break; case LOAD_CONST: x = GETCONST(oparg); Py_INCREF(x); PUSH(x); break; case LOAD_NAME: w = GETNAMEV(oparg); if ((x = f->f_locals) == NULL) { PyErr_Format(PyExc_SystemError, "no locals when loading %s", PyObject_REPR(w)); break; } x = PyDict_GetItem(x, w); if (x == NULL) { x = PyDict_GetItem(f->f_globals, w); if (x == NULL) { x = PyDict_GetItem(f->f_builtins, w); if (x == NULL) { format_exc_check_arg( PyExc_NameError, NAME_ERROR_MSG ,w); break; } } } Py_INCREF(x); PUSH(x); break; case LOAD_GLOBAL: w = GETNAMEV(oparg); x = PyDict_GetItem(f->f_globals, w); if (x == NULL) { x = PyDict_GetItem(f->f_builtins, w); if (x == NULL) { format_exc_check_arg( PyExc_NameError, GLOBAL_NAME_ERROR_MSG ,w); break; } } Py_INCREF(x); PUSH(x); break; case LOAD_FAST: x = GETLOCAL(oparg); if (x == NULL) { format_exc_check_arg( PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg) ); break; } Py_INCREF(x); PUSH(x); if (x != NULL) continue; break; case STORE_FAST: v = POP(); SETLOCAL(oparg, v); continue; case DELETE_FAST: x = GETLOCAL(oparg); if (x == NULL) { format_exc_check_arg( PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg) ); break; } SETLOCAL(oparg, NULL); continue; case LOAD_CLOSURE: x = freevars[oparg]; Py_INCREF(x); PUSH(x); break; case LOAD_DEREF: x = freevars[oparg]; w = PyCell_Get(x); if (w == NULL) { if (oparg < f->f_ncells) { v = PyTuple_GetItem(co->co_cellvars, oparg); format_exc_check_arg( PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, v); } else { v = PyTuple_GetItem( co->co_freevars, oparg - f->f_ncells); format_exc_check_arg( PyExc_NameError, UNBOUNDFREE_ERROR_MSG, v); } err = -1; break; } PUSH(w); break; case STORE_DEREF: w = POP(); x = freevars[oparg]; PyCell_Set(x, w); Py_DECREF(w); continue; case BUILD_TUPLE: x = PyTuple_New(oparg); if (x != NULL) { for (; --oparg >= 0;) { w = POP(); PyTuple_SET_ITEM(x, oparg, w); } PUSH(x); continue; } break; case BUILD_LIST: x = PyList_New(oparg); if (x != NULL) { for (; --oparg >= 0;) { w = POP(); PyList_SET_ITEM(x, oparg, w); } PUSH(x); continue; } break; case BUILD_MAP: x = PyDict_New(); PUSH(x); if (x != NULL) continue; break; case LOAD_ATTR: w = GETNAMEV(oparg); v = POP(); x = PyObject_GetAttr(v, w); Py_DECREF(v); PUSH(x); if (x != NULL) continue; break; case COMPARE_OP: w = POP(); v = POP(); if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) { /* INLINE: cmp(int, int) */ register long a, b; register int res; a = PyInt_AS_LONG(v); b = PyInt_AS_LONG(w); switch (oparg) { case LT: res = a < b; break; case LE: res = a <= b; break; case EQ: res = a == b; break; case NE: res = a != b; break; case GT: res = a > b; break; case GE: res = a >= b; break; case IS: res = v == w; break; case IS_NOT: res = v != w; break; default: goto slow_compare; } x = res ? Py_True : Py_False; Py_INCREF(x); } else { slow_compare: x = cmp_outcome(oparg, v, w); } Py_DECREF(v); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case IMPORT_NAME: w = GETNAMEV(oparg); x = PyDict_GetItemString(f->f_builtins, "__import__"); if (x == NULL) { PyErr_SetString(PyExc_ImportError, "__import__ not found"); break; } u = POP(); w = Py_BuildValue("(OOOO)", w, f->f_globals, f->f_locals == NULL ? Py_None : f->f_locals, u); Py_DECREF(u); if (w == NULL) { x = NULL; break; } x = PyEval_CallObject(x, w); Py_DECREF(w); PUSH(x); if (x != NULL) continue; break; case IMPORT_STAR: v = POP(); PyFrame_FastToLocals(f); if ((x = f->f_locals) == NULL) { PyErr_SetString(PyExc_SystemError, "no locals found during 'import *'"); break; } err = import_all_from(x, v); PyFrame_LocalsToFast(f, 0); Py_DECREF(v); if (err == 0) continue; break; case IMPORT_FROM: w = GETNAMEV(oparg); v = TOP(); x = import_from(v, w); PUSH(x); if (x != NULL) continue; break; case JUMP_FORWARD: JUMPBY(oparg); continue; case JUMP_IF_FALSE: err = PyObject_IsTrue(TOP()); if (err > 0) err = 0; else if (err == 0) JUMPBY(oparg); else break; continue; case JUMP_IF_TRUE: err = PyObject_IsTrue(TOP()); if (err > 0) { err = 0; JUMPBY(oparg); } else if (err == 0) ; else break; continue; case JUMP_ABSOLUTE: JUMPTO(oparg); continue; case GET_ITER: /* before: [obj]; after [getiter(obj)] */ v = POP(); x = PyObject_GetIter(v); Py_DECREF(v); if (x != NULL) { PUSH(x); continue; } break; case FOR_ITER: /* before: [iter]; after: [iter, iter()] *or* [] */ v = TOP(); x = PyIter_Next(v); if (x != NULL) { PUSH(x); continue; } if (!PyErr_Occurred()) { /* iterator ended normally */ x = v = POP(); Py_DECREF(v); JUMPBY(oparg); continue; } break; case FOR_LOOP: /* for v in s: ... On entry: stack contains s, i. On exit: stack contains s, i+1, s[i]; but if loop exhausted: s, i are popped, and we jump */ w = POP(); /* Loop index */ v = POP(); /* Sequence object */ u = loop_subscript(v, w); if (u != NULL) { PUSH(v); x = PyInt_FromLong(PyInt_AsLong(w)+1); PUSH(x); Py_DECREF(w); PUSH(u); if (x != NULL) continue; } else { Py_DECREF(v); Py_DECREF(w); /* A NULL can mean "s exhausted" but also an error: */ if (PyErr_Occurred()) why = WHY_EXCEPTION; else { JUMPBY(oparg); continue; } } break; case SETUP_LOOP: case SETUP_EXCEPT: case SETUP_FINALLY: PyFrame_BlockSetup(f, opcode, INSTR_OFFSET() + oparg, STACK_LEVEL()); continue; case SET_LINENO: #ifdef LLTRACE if (lltrace) printf("--- %s:%d \n", filename, oparg); #endif f->f_lineno = oparg; if (tstate->c_tracefunc == NULL || tstate->tracing) continue; /* Trace each line of code reached */ f->f_lasti = INSTR_OFFSET(); /* Inline call_trace() for performance: */ tstate->tracing++; tstate->use_tracing = 0; err = (tstate->c_tracefunc)(tstate->c_traceobj, f, PyTrace_LINE, Py_None); tstate->use_tracing = (tstate->c_tracefunc || tstate->c_profilefunc); tstate->tracing--; break; case CALL_FUNCTION: { int na = oparg & 0xff; int nk = (oparg>>8) & 0xff; int n = na + 2 * nk; PyObject **pfunc = stack_pointer - n - 1; PyObject *func = *pfunc; f->f_lasti = INSTR_OFFSET() - 3; /* For tracing */ /* Always dispatch PyCFunction first, because these are presumed to be the most frequent callable object. */ if (PyCFunction_Check(func)) { int flags = PyCFunction_GET_FLAGS(func); if (nk != 0 || (flags & METH_KEYWORDS)) x = do_call(func, &stack_pointer, na, nk); else if (flags == METH_VARARGS) { PyObject *callargs; callargs = load_args(&stack_pointer, na); x = PyCFunction_Call(func, callargs, NULL); Py_XDECREF(callargs); } else x = fast_cfunction(func, &stack_pointer, na); } else { if (PyMethod_Check(func) && PyMethod_GET_SELF(func) != NULL) { /* optimize access to bound methods */ PyObject *self = PyMethod_GET_SELF(func); Py_INCREF(self); func = PyMethod_GET_FUNCTION(func); Py_INCREF(func); Py_DECREF(*pfunc); *pfunc = self; na++; n++; } else Py_INCREF(func); if (PyFunction_Check(func)) { x = fast_function(func, &stack_pointer, n, na, nk); } else { x = do_call(func, &stack_pointer, na, nk); } Py_DECREF(func); } while (stack_pointer > pfunc) { w = POP(); Py_DECREF(w); } PUSH(x); if (x != NULL) continue; break; } case CALL_FUNCTION_VAR: case CALL_FUNCTION_KW: case CALL_FUNCTION_VAR_KW: { int na = oparg & 0xff; int nk = (oparg>>8) & 0xff; int flags = (opcode - CALL_FUNCTION) & 3; int n = na + 2 * nk; PyObject **pfunc, *func; if (flags & CALL_FLAG_VAR) n++; if (flags & CALL_FLAG_KW) n++; pfunc = stack_pointer - n - 1; func = *pfunc; f->f_lasti = INSTR_OFFSET() - 3; /* For tracing */ if (PyMethod_Check(func) && PyMethod_GET_SELF(func) != NULL) { PyObject *self = PyMethod_GET_SELF(func); Py_INCREF(self); func = PyMethod_GET_FUNCTION(func); Py_INCREF(func); Py_DECREF(*pfunc); *pfunc = self; na++; n++; } else Py_INCREF(func); x = ext_do_call(func, &stack_pointer, flags, na, nk); Py_DECREF(func); while (stack_pointer > pfunc) { w = POP(); Py_DECREF(w); } PUSH(x); if (x != NULL) continue; break; } case MAKE_FUNCTION: v = POP(); /* code object */ x = PyFunction_New(v, f->f_globals); Py_DECREF(v); /* XXX Maybe this should be a separate opcode? */ if (x != NULL && oparg > 0) { v = PyTuple_New(oparg); if (v == NULL) { Py_DECREF(x); x = NULL; break; } while (--oparg >= 0) { w = POP(); PyTuple_SET_ITEM(v, oparg, w); } err = PyFunction_SetDefaults(x, v); Py_DECREF(v); } PUSH(x); break; case MAKE_CLOSURE: { int nfree; v = POP(); /* code object */ x = PyFunction_New(v, f->f_globals); nfree = PyTuple_GET_SIZE(((PyCodeObject *)v)->co_freevars); Py_DECREF(v); /* XXX Maybe this should be a separate opcode? */ if (x != NULL && nfree > 0) { v = PyTuple_New(nfree); if (v == NULL) { Py_DECREF(x); x = NULL; break; } while (--nfree >= 0) { w = POP(); PyTuple_SET_ITEM(v, nfree, w); } err = PyFunction_SetClosure(x, v); Py_DECREF(v); } if (x != NULL && oparg > 0) { v = PyTuple_New(oparg); if (v == NULL) { Py_DECREF(x); x = NULL; break; } while (--oparg >= 0) { w = POP(); PyTuple_SET_ITEM(v, oparg, w); } err = PyFunction_SetDefaults(x, v); Py_DECREF(v); } PUSH(x); break; } case BUILD_SLICE: if (oparg == 3) w = POP(); else w = NULL; v = POP(); u = POP(); x = PySlice_New(u, v, w); Py_DECREF(u); Py_DECREF(v); Py_XDECREF(w); PUSH(x); if (x != NULL) continue; break; case EXTENDED_ARG: opcode = NEXTOP(); oparg = oparg<<16 | NEXTARG(); goto dispatch_opcode; default: fprintf(stderr, "XXX lineno: %d, opcode: %d\n", f->f_lineno, opcode); PyErr_SetString(PyExc_SystemError, "unknown opcode"); why = WHY_EXCEPTION; break; #ifdef CASE_TOO_BIG } #endif } /* switch */ on_error: /* Quickly continue if no error occurred */ if (why == WHY_NOT) { if (err == 0 && x != NULL) { #ifdef CHECKEXC /* This check is expensive! */ if (PyErr_Occurred()) fprintf(stderr, "XXX undetected error\n"); else #endif continue; /* Normal, fast path */ } why = WHY_EXCEPTION; x = Py_None; err = 0; } /* Double-check exception status */ if (why == WHY_EXCEPTION || why == WHY_RERAISE) { if (!PyErr_Occurred()) { PyErr_SetString(PyExc_SystemError, "error return without exception set"); why = WHY_EXCEPTION; } } #ifdef CHECKEXC else { /* This check is expensive! */ if (PyErr_Occurred()) { fprintf(stderr, "XXX undetected error (why=%d)\n", why); why = WHY_EXCEPTION; } } #endif /* Log traceback info if this is a real exception */ if (why == WHY_EXCEPTION) { f->f_lasti = INSTR_OFFSET() - 1; if (HAS_ARG(opcode)) f->f_lasti -= 2; PyTraceBack_Here(f); if (tstate->c_tracefunc != NULL) call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, f); } /* For the rest, treat WHY_RERAISE as WHY_EXCEPTION */ if (why == WHY_RERAISE) why = WHY_EXCEPTION; /* Unwind stacks if a (pseudo) exception occurred */ while (why != WHY_NOT && why != WHY_YIELD && f->f_iblock > 0) { PyTryBlock *b = PyFrame_BlockPop(f); if (b->b_type == SETUP_LOOP && why == WHY_CONTINUE) { /* For a continue inside a try block, don't pop the block for the loop. */ PyFrame_BlockSetup(f, b->b_type, b->b_handler, b->b_level); why = WHY_NOT; JUMPTO(PyInt_AS_LONG(retval)); Py_DECREF(retval); break; } while (STACK_LEVEL() > b->b_level) { v = POP(); Py_XDECREF(v); } if (b->b_type == SETUP_LOOP && why == WHY_BREAK) { why = WHY_NOT; JUMPTO(b->b_handler); break; } if (b->b_type == SETUP_FINALLY || (b->b_type == SETUP_EXCEPT && why == WHY_EXCEPTION)) { if (why == WHY_EXCEPTION) { PyObject *exc, *val, *tb; PyErr_Fetch(&exc, &val, &tb); if (val == NULL) { val = Py_None; Py_INCREF(val); } /* Make the raw exception data available to the handler, so a program can emulate the Python main loop. Don't do this for 'finally'. */ if (b->b_type == SETUP_EXCEPT) { PyErr_NormalizeException( &exc, &val, &tb); set_exc_info(tstate, exc, val, tb); } if (tb == NULL) { Py_INCREF(Py_None); PUSH(Py_None); } else PUSH(tb); PUSH(val); PUSH(exc); } else { if (why == WHY_RETURN || why == CONTINUE_LOOP) PUSH(retval); v = PyInt_FromLong((long)why); PUSH(v); } why = WHY_NOT; JUMPTO(b->b_handler); break; } } /* unwind stack */ /* End the loop if we still have an error (or return) */ if (why != WHY_NOT) break; } /* main loop */ if (why != WHY_RETURN && why != WHY_YIELD) retval = NULL; if (tstate->use_tracing) { if (tstate->c_tracefunc && (why == WHY_RETURN || why == WHY_YIELD)) { if (call_trace(tstate->c_tracefunc, tstate->c_traceobj, f, PyTrace_RETURN, retval)) { Py_XDECREF(retval); retval = NULL; why = WHY_EXCEPTION; } } if (tstate->c_profilefunc) { if (why == WHY_EXCEPTION) call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, f, PyTrace_RETURN); else if (call_trace(tstate->c_profilefunc, tstate->c_profileobj, f, PyTrace_RETURN, retval)) { Py_XDECREF(retval); retval = NULL; why = WHY_EXCEPTION; } } } reset_exc_info(tstate); /* pop frame */ --tstate->recursion_depth; tstate->frame = f->f_back; return retval; } PyObject * PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals, PyObject **args, int argcount, PyObject **kws, int kwcount, PyObject **defs, int defcount, PyObject *closure) { register PyFrameObject *f; register PyObject *retval = NULL; register PyObject **fastlocals, **freevars; PyThreadState *tstate = PyThreadState_GET(); PyObject *x, *u; if (globals == NULL) { PyErr_SetString(PyExc_SystemError, "PyEval_EvalCodeEx: NULL globals"); return NULL; } f = PyFrame_New(tstate, /*back*/ co, /*code*/ globals, locals); if (f == NULL) return NULL; fastlocals = f->f_localsplus; freevars = f->f_localsplus + f->f_nlocals; if (co->co_argcount > 0 || co->co_flags & (CO_VARARGS | CO_VARKEYWORDS)) { int i; int n = argcount; PyObject *kwdict = NULL; if (co->co_flags & CO_VARKEYWORDS) { kwdict = PyDict_New(); if (kwdict == NULL) goto fail; i = co->co_argcount; if (co->co_flags & CO_VARARGS) i++; SETLOCAL(i, kwdict); } if (argcount > co->co_argcount) { if (!(co->co_flags & CO_VARARGS)) { PyErr_Format(PyExc_TypeError, "%.200s() takes %s %d " "%sargument%s (%d given)", PyString_AsString(co->co_name), defcount ? "at most" : "exactly", co->co_argcount, kwcount ? "non-keyword " : "", co->co_argcount == 1 ? "" : "s", argcount); goto fail; } n = co->co_argcount; } for (i = 0; i < n; i++) { x = args[i]; Py_INCREF(x); SETLOCAL(i, x); } if (co->co_flags & CO_VARARGS) { u = PyTuple_New(argcount - n); if (u == NULL) goto fail; SETLOCAL(co->co_argcount, u); for (i = n; i < argcount; i++) { x = args[i]; Py_INCREF(x); PyTuple_SET_ITEM(u, i-n, x); } } for (i = 0; i < kwcount; i++) { PyObject *keyword = kws[2*i]; PyObject *value = kws[2*i + 1]; int j; if (keyword == NULL || !PyString_Check(keyword)) { PyErr_Format(PyExc_TypeError, "%.200s() keywords must be strings", PyString_AsString(co->co_name)); goto fail; } /* XXX slow -- speed up using dictionary? */ for (j = 0; j < co->co_argcount; j++) { PyObject *nm = PyTuple_GET_ITEM( co->co_varnames, j); int cmp = PyObject_RichCompareBool( keyword, nm, Py_EQ); if (cmp > 0) break; else if (cmp < 0) goto fail; } /* Check errors from Compare */ if (PyErr_Occurred()) goto fail; if (j >= co->co_argcount) { if (kwdict == NULL) { PyErr_Format(PyExc_TypeError, "%.200s() got an unexpected " "keyword argument '%.400s'", PyString_AsString(co->co_name), PyString_AsString(keyword)); goto fail; } PyDict_SetItem(kwdict, keyword, value); } else { if (GETLOCAL(j) != NULL) { PyErr_Format(PyExc_TypeError, "%.200s() got multiple " "values for keyword " "argument '%.400s'", PyString_AsString(co->co_name), PyString_AsString(keyword)); goto fail; } Py_INCREF(value); SETLOCAL(j, value); } } if (argcount < co->co_argcount) { int m = co->co_argcount - defcount; for (i = argcount; i < m; i++) { if (GETLOCAL(i) == NULL) { PyErr_Format(PyExc_TypeError, "%.200s() takes %s %d " "%sargument%s (%d given)", PyString_AsString(co->co_name), ((co->co_flags & CO_VARARGS) || defcount) ? "at least" : "exactly", m, kwcount ? "non-keyword " : "", m == 1 ? "" : "s", i); goto fail; } } if (n > m) i = n - m; else i = 0; for (; i < defcount; i++) { if (GETLOCAL(m+i) == NULL) { PyObject *def = defs[i]; Py_INCREF(def); SETLOCAL(m+i, def); } } } } else { if (argcount > 0 || kwcount > 0) { PyErr_Format(PyExc_TypeError, "%.200s() takes no arguments (%d given)", PyString_AsString(co->co_name), argcount + kwcount); goto fail; } } /* Allocate and initialize storage for cell vars, and copy free vars into frame. This isn't too efficient right now. */ if (f->f_ncells) { int i = 0, j = 0, nargs, found; char *cellname, *argname; PyObject *c; nargs = co->co_argcount; if (co->co_flags & CO_VARARGS) nargs++; if (co->co_flags & CO_VARKEYWORDS) nargs++; /* Check for cells that shadow args */ for (i = 0; i < f->f_ncells && j < nargs; ++i) { cellname = PyString_AS_STRING( PyTuple_GET_ITEM(co->co_cellvars, i)); found = 0; while (j < nargs) { argname = PyString_AS_STRING( PyTuple_GET_ITEM(co->co_varnames, j)); if (strcmp(cellname, argname) == 0) { c = PyCell_New(GETLOCAL(j)); if (c == NULL) goto fail; GETLOCAL(f->f_nlocals + i) = c; found = 1; break; } j++; } if (found == 0) { c = PyCell_New(NULL); if (c == NULL) goto fail; SETLOCAL(f->f_nlocals + i, c); } } /* Initialize any that are left */ while (i < f->f_ncells) { c = PyCell_New(NULL); if (c == NULL) goto fail; SETLOCAL(f->f_nlocals + i, c); i++; } } if (f->f_nfreevars) { int i; for (i = 0; i < f->f_nfreevars; ++i) { PyObject *o = PyTuple_GET_ITEM(closure, i); Py_INCREF(o); freevars[f->f_ncells + i] = o; } } if (co->co_flags & CO_GENERATOR) { /* Don't need to keep the reference to f_back, it will be set * when the generator is resumed. */ Py_XDECREF(f->f_back); f->f_back = NULL; /* Create a new generator that owns the ready to run frame * and return that as the value. */ return gen_new(f); } retval = eval_frame(f); fail: /* Jump here from prelude on failure */ Py_DECREF(f); return retval; } static void set_exc_info(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *tb) { PyFrameObject *frame; PyObject *tmp_type, *tmp_value, *tmp_tb; frame = tstate->frame; if (frame->f_exc_type == NULL) { /* This frame didn't catch an exception before */ /* Save previous exception of this thread in this frame */ if (tstate->exc_type == NULL) { Py_INCREF(Py_None); tstate->exc_type = Py_None; } tmp_type = frame->f_exc_type; tmp_value = frame->f_exc_value; tmp_tb = frame->f_exc_traceback; Py_XINCREF(tstate->exc_type); Py_XINCREF(tstate->exc_value); Py_XINCREF(tstate->exc_traceback); frame->f_exc_type = tstate->exc_type; frame->f_exc_value = tstate->exc_value; frame->f_exc_traceback = tstate->exc_traceback; Py_XDECREF(tmp_type); Py_XDECREF(tmp_value); Py_XDECREF(tmp_tb); } /* Set new exception for this thread */ tmp_type = tstate->exc_type; tmp_value = tstate->exc_value; tmp_tb = tstate->exc_traceback; Py_XINCREF(type); Py_XINCREF(value); Py_XINCREF(tb); tstate->exc_type = type; tstate->exc_value = value; tstate->exc_traceback = tb; Py_XDECREF(tmp_type); Py_XDECREF(tmp_value); Py_XDECREF(tmp_tb); /* For b/w compatibility */ PySys_SetObject("exc_type", type); PySys_SetObject("exc_value", value); PySys_SetObject("exc_traceback", tb); } static void reset_exc_info(PyThreadState *tstate) { PyFrameObject *frame; PyObject *tmp_type, *tmp_value, *tmp_tb; frame = tstate->frame; if (frame->f_exc_type != NULL) { /* This frame caught an exception */ tmp_type = tstate->exc_type; tmp_value = tstate->exc_value; tmp_tb = tstate->exc_traceback; Py_XINCREF(frame->f_exc_type); Py_XINCREF(frame->f_exc_value); Py_XINCREF(frame->f_exc_traceback); tstate->exc_type = frame->f_exc_type; tstate->exc_value = frame->f_exc_value; tstate->exc_traceback = frame->f_exc_traceback; Py_XDECREF(tmp_type); Py_XDECREF(tmp_value); Py_XDECREF(tmp_tb); /* For b/w compatibility */ PySys_SetObject("exc_type", frame->f_exc_type); PySys_SetObject("exc_value", frame->f_exc_value); PySys_SetObject("exc_traceback", frame->f_exc_traceback); } tmp_type = frame->f_exc_type; tmp_value = frame->f_exc_value; tmp_tb = frame->f_exc_traceback; frame->f_exc_type = NULL; frame->f_exc_value = NULL; frame->f_exc_traceback = NULL; Py_XDECREF(tmp_type); Py_XDECREF(tmp_value); Py_XDECREF(tmp_tb); } /* Logic for the raise statement (too complicated for inlining). This *consumes* a reference count to each of its arguments. */ static enum why_code do_raise(PyObject *type, PyObject *value, PyObject *tb) { if (type == NULL) { /* Reraise */ PyThreadState *tstate = PyThreadState_Get(); type = tstate->exc_type == NULL ? Py_None : tstate->exc_type; value = tstate->exc_value; tb = tstate->exc_traceback; Py_XINCREF(type); Py_XINCREF(value); Py_XINCREF(tb); } /* We support the following forms of raise: raise , raise , raise , None raise , raise , None raise ,
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