/* 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 <ctype.h>

/* 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 *call_function(PyObject ***, int);

static PyObject *fast_function(PyObject *, PyObject ***, int, int, 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 int maybe_call_line_trace(Py_tracefunc, PyObject *,

PyFrameObject *, int *, int *);

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

static 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;

/* List of weak reference. */

PyObject *gi_weakreflist;

} genobject;

static PyObject *

gen_new(PyFrameObject *f)

{

genobject *gen = PyObject_GC_New(genobject, &gentype);

if (gen == NULL) {

Py_DECREF(f);

return NULL;

}

gen->gi_frame = f;

gen->gi_running = 0;

gen->gi_weakreflist = NULL;

_PyObject_GC_TRACK(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_UNTRACK(gen);

if (gen->gi_weakreflist != NULL)

PyObject_ClearWeakRefs((PyObject *) gen);

Py_DECREF(gen->gi_frame);

PyObject_GC_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_getiter(PyObject *gen)

{

Py_INCREF(gen);

return gen;

}

static PyMemberDef gen_memberlist[] = {

{"gi_frame", T_OBJECT, offsetof(genobject, gi_frame), RO},

{"gi_running", T_INT, offsetof(genobject, gi_running), RO},

{NULL} /* Sentinel */

};

static PyTypeObject gentype = {

PyObject_HEAD_INIT(&PyType_Type)

0, /* ob_size */

"generator", /* tp_name */

sizeof(genobject), /* 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_HAVE_GC,/* tp_flags */

0, /* tp_doc */

(traverseproc)gen_traverse, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

offsetof(genobject, gi_weakreflist), /* tp_weaklistoffset */

(getiterfunc)gen_getiter, /* tp_iter */

(iternextfunc)gen_iternext, /* tp_iternext */

0, /* tp_methods */

gen_memberlist, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

};

#ifdef WITH_THREAD

#ifndef DONT_HAVE_ERRNO_H

#include <errno.h>

#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) {

busy = 0;

return -1; /* Queue full */

}

pendingcalls[i].func = func;

pendingcalls[i].arg = arg;

pendinglast = j;

_Py_Ticker = 0;

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 **);

/* for manipulating the thread switch and periodic "stuff" - used to be

per thread, now just a pair o' globals */

int _Py_CheckInterval = 100;

volatile int _Py_Ticker = 100;

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; /* Next free slot in value stack */

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;

/* when tracing we set things up so that

not (instr_lb <= current_bytecode_offset < instr_ub)

is true when the line being executed has changed. The

initial values are such as to make this false the first

time it is tested. */

int instr_ub = -1, instr_lb = 0;

unsigned char *first_instr;

PyObject *names;

PyObject *consts;

#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

/* Tuple access macros */

#ifndef Py_DEBUG

#define GETITEM(v, i) PyTuple_GET_ITEM((PyTupleObject *)(v), (i))

#else

#define GETITEM(v, i) PyTuple_GetItem((v), (i))

#endif

/* Code access macros */

#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 SECOND() (stack_pointer[-2])

#define THIRD() (stack_pointer[-3])

#define FOURTH() (stack_pointer[-4])

#define SET_TOP(v) (stack_pointer[-1] = (v))

#define SET_SECOND(v) (stack_pointer[-2] = (v))

#define SET_THIRD(v) (stack_pointer[-3] = (v))

#define SET_FOURTH(v) (stack_pointer[-4] = (v))

#define BASIC_STACKADJ(n) (stack_pointer += n)

#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())

#define STACKADJ(n) { (void)(BASIC_STACKADJ(n), \

lltrace && prtrace(TOP(), "stackadj")); \

assert(STACK_LEVEL() <= f->f_stacksize); }

#else

#define PUSH(v) BASIC_PUSH(v)

#define POP() BASIC_POP()

#define STACKADJ(n) BASIC_STACKADJ(n)

#endif

/* Local variable macros */

#define GETLOCAL(i) (fastlocals[i])

/* The SETLOCAL() macro must not DECREF the local variable in-place and

then store the new value; it must copy the old value to a temporary

value, then store the new value, and then DECREF the temporary value.

This is because it is possible that during the DECREF the frame is

accessed by other code (e.g. a __del__ method or gc.collect()) and the

variable would be pointing to already-freed memory. */

#define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \

GETLOCAL(i) = value; \

Py_XDECREF(tmp); } 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;

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 */

--tstate->recursion_depth;

tstate->frame = f->f_back;

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 */

--tstate->recursion_depth;

tstate->frame = f->f_back;

return NULL;

}

}

}

co = f->f_code;

names = co->co_names;

consts = co->co_consts;

fastlocals = f->f_localsplus;

freevars = f->f_localsplus + f->f_nlocals;

_PyCode_GETCODEPTR(co, &first_instr);

/* An explanation is in order for the next line.

f->f_lasti now refers to the index of the last instruction

executed. You might think this was obvious from the name, but

this wasn't always true before 2.3! PyFrame_New now sets

f->f_lasti to -1 (i.e. the index *before* the first instruction)

and YIELD_VALUE doesn't fiddle with f_lasti any more. So this

does work. Promise. */

next_instr = first_instr + f->f_lasti + 1;

stack_pointer = f->f_stacktop;

assert(stack_pointer != NULL);

f->f_stacktop = NULL; /* remains NULL unless yield suspends frame */

#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 (;;) {

assert(stack_pointer >= f->f_valuestack); /* else underflow */

assert(STACK_LEVEL() <= f->f_stacksize); /* else overflow */

/* 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 (--_Py_Ticker < 0) {

_Py_Ticker = _Py_CheckInterval;

tstate->tick_counter++;

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 PyErr_CheckSignals(). 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

}

fast_next_opcode:

f->f_lasti = INSTR_OFFSET();

/* line-by-line tracing support */

if (tstate->c_tracefunc != NULL && !tstate->tracing) {

/* see maybe_call_line_trace

for expository comments */

f->f_stacktop = stack_pointer;

if (maybe_call_line_trace(tstate->c_tracefunc,

tstate->c_traceobj,

f, &instr_lb, &instr_ub)) {

/* trace function raised an exception */

why = WHY_EXCEPTION;

goto on_error;

}

/* Reload possibly changed frame fields */

JUMPTO(f->f_lasti);

stack_pointer = f->f_stacktop;

assert(stack_pointer != NULL);

f->f_stacktop = NULL;

}

/* Extract opcode and argument */

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",

f->f_lasti, opcode, oparg);

}

else {

printf("%d: %d\n",

f->f_lasti, 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 LOAD_FAST:

x = GETLOCAL(oparg);

if (x != NULL) {

Py_INCREF(x);

PUSH(x);

goto fast_next_opcode;

}

format_exc_check_arg(PyExc_UnboundLocalError,

UNBOUNDLOCAL_ERROR_MSG,

PyTuple_GetItem(co->co_varnames, oparg));

break;

case LOAD_CONST:

x = GETITEM(consts, oparg);

Py_INCREF(x);

PUSH(x);

goto fast_next_opcode;

case STORE_FAST:

v = POP();

SETLOCAL(oparg, v);

goto fast_next_opcode;

case POP_TOP:

v = POP();

Py_DECREF(v);

goto fast_next_opcode;

case ROT_TWO:

v = TOP();

w = SECOND();

SET_TOP(w);

SET_SECOND(v);

continue;

case ROT_THREE:

v = TOP();

w = SECOND();

x = THIRD();

SET_TOP(w);

SET_SECOND(x);

SET_THIRD(v);

continue;

case ROT_FOUR:

u = TOP();

v = SECOND();

w = THIRD();

x = FOURTH();

SET_TOP(v);

SET_SECOND(w);

SET_THIRD(x);

SET_FOURTH(u);

continue;

case DUP_TOP:

v = TOP();

Py_INCREF(v);

PUSH(v);

continue;

case DUP_TOPX:

if (oparg == 2) {

x = TOP();

Py_INCREF(x);

w = SECOND();

Py_INCREF(w);

STACKADJ(2);

SET_TOP(x);

SET_SECOND(w);

continue;

} else if (oparg == 3) {

x = TOP();

Py_INCREF(x);

w = SECOND();

Py_INCREF(w);

v = THIRD();

Py_INCREF(v);

STACKADJ(3);

SET_TOP(x);

SET_SECOND(w);

SET_THIRD(v);

continue;

}

Py_FatalError("invalid argument to DUP_TOPX"

" (bytecode corruption?)");

break;

case UNARY_POSITIVE:

v = TOP();

x = PyNumber_Positive(v);

Py_DECREF(v);

SET_TOP(x);

if (x != NULL) continue;

break;

case UNARY_NEGATIVE:

v = TOP();

x = PyNumber_Negative(v);

Py_DECREF(v);

SET_TOP(x);

if (x != NULL) continue;

break;

case UNARY_NOT:

v = TOP();

err = PyObject_IsTrue(v);

Py_DECREF(v);

if (err == 0) {

Py_INCREF(Py_True);

SET_TOP(Py_True);

continue;

}

else if (err > 0) {

Py_INCREF(Py_False);

SET_TOP(Py_False);

err = 0;

continue;

}

STACKADJ(-1);

break;

case UNARY_CONVERT:

v = TOP();

x = PyObject_Repr(v);

Py_DECREF(v);

SET_TOP(x);

if (x != NULL) continue;

break;

case UNARY_INVERT:

v = TOP();

x = PyNumber_Invert(v);

Py_DECREF(v);

SET_TOP(x);

if (x != NULL) continue;

break;

case BINARY_POWER:

w = POP();

v = TOP();

x = PyNumber_Power(v, w, Py_None);

Py_DECREF(v);

Py_DECREF(w);

SET_TOP(x);

if (x != NULL) continue;

break;

case BINARY_MULTIPLY:

w = POP();

v = TOP();

x = PyNumber_Multiply(v, w);

Py_DECREF(v);

Py_DECREF(w);

SET_TOP(x);

if (x != NULL) continue;

break;

case BINARY_DIVIDE:

if (!_Py_QnewFlag) {

w = POP();

v = TOP();

x = PyNumber_Divide(v, w);

Py_DECREF(v);

Py_DECREF(w);

SET_TOP(x);

if (x != NULL) continue;

break;

}

/* -Qnew is in effect: fall through to

BINARY_TRUE_DIVIDE */

case BINARY_TRUE_DIVIDE:

w = POP();

v = TOP();

x = PyNumber_TrueDivide(v, w);

Py_DECREF(v);

Py_DECREF(w);

SET_TOP(x);

if (x != NULL) continue;

break;

case BINARY_FLOOR_DIVIDE:

w = POP();

v = TOP();

x = PyNumber_FloorDivide(v, w);

Py_DECREF(v);

Py_DECREF(w);

SET_TOP(x);

if (x != NULL) continue;

break;

case BINARY_MODULO:

w = POP();

v = TOP();

x = PyNumber_Remainder(v, w);

Py_DECREF(v);

Py_DECREF(w);

SET_TOP(x);

if (x != NULL) continue;

break;

case BINARY_ADD:

w = POP();

v = TOP();

if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) {