source: python/trunk/Python/ceval.c@ 20

Last change on this file since 20 was 2, checked in by Yuri Dario, 15 years ago

Initial import for vendor code.
  • Property svn:eol-style set to native
File size: 111.3 KB
Line 
1
2/* Execute compiled code */
3
4/* XXX TO DO:
5 XXX speed up searching for keywords by using a dictionary
6 XXX document it!
7 */
8
9/* enable more aggressive intra-module optimizations, where available */
10#define PY_LOCAL_AGGRESSIVE
11
12#include "Python.h"
13
14#include "code.h"
15#include "frameobject.h"
16#include "eval.h"
17#include "opcode.h"
18#include "structmember.h"
19
20#include <ctype.h>
21
22#ifndef WITH_TSC
23
24#define READ_TIMESTAMP(var)
25
26#else
27
28typedef unsigned long long uint64;
29
30#if defined(__ppc__) /* <- Don't know if this is the correct symbol; this
31 section should work for GCC on any PowerPC
32 platform, irrespective of OS.
33 POWER? Who knows :-) */
34
35#define READ_TIMESTAMP(var) ppc_getcounter(&var)
36
37static void
38ppc_getcounter(uint64 *v)
39{
40 register unsigned long tbu, tb, tbu2;
41
42 loop:
43 asm volatile ("mftbu %0" : "=r" (tbu) );
44 asm volatile ("mftb %0" : "=r" (tb) );
45 asm volatile ("mftbu %0" : "=r" (tbu2));
46 if (__builtin_expect(tbu != tbu2, 0)) goto loop;
47
48 /* The slightly peculiar way of writing the next lines is
49 compiled better by GCC than any other way I tried. */
50 ((long*)(v))[0] = tbu;
51 ((long*)(v))[1] = tb;
52}
53
54#elif defined(__i386__)
55
56/* this is for linux/x86 (and probably any other GCC/x86 combo) */
57
58#define READ_TIMESTAMP(val) \
59 __asm__ __volatile__("rdtsc" : "=A" (val))
60
61#elif defined(__x86_64__)
62
63/* for gcc/x86_64, the "A" constraint in DI mode means *either* rax *or* rdx;
64 not edx:eax as it does for i386. Since rdtsc puts its result in edx:eax
65 even in 64-bit mode, we need to use "a" and "d" for the lower and upper
66 32-bit pieces of the result. */
67
68#define READ_TIMESTAMP(val) \
69 __asm__ __volatile__("rdtsc" : \
70 "=a" (((int*)&(val))[0]), "=d" (((int*)&(val))[1]));
71
72
73#else
74
75#error "Don't know how to implement timestamp counter for this architecture"
76
77#endif
78
79void dump_tsc(int opcode, int ticked, uint64 inst0, uint64 inst1,
80 uint64 loop0, uint64 loop1, uint64 intr0, uint64 intr1)
81{
82 uint64 intr, inst, loop;
83 PyThreadState *tstate = PyThreadState_Get();
84 if (!tstate->interp->tscdump)
85 return;
86 intr = intr1 - intr0;
87 inst = inst1 - inst0 - intr;
88 loop = loop1 - loop0 - intr;
89 fprintf(stderr, "opcode=%03d t=%d inst=%06lld loop=%06lld\n",
90 opcode, ticked, inst, loop);
91}
92
93#endif
94
95/* Turn this on if your compiler chokes on the big switch: */
96/* #define CASE_TOO_BIG 1 */
97
98#ifdef Py_DEBUG
99/* For debugging the interpreter: */
100#define LLTRACE 1 /* Low-level trace feature */
101#define CHECKEXC 1 /* Double-check exception checking */
102#endif
103
104typedef PyObject *(*callproc)(PyObject *, PyObject *, PyObject *);
105
106/* Forward declarations */
107#ifdef WITH_TSC
108static PyObject * call_function(PyObject ***, int, uint64*, uint64*);
109#else
110static PyObject * call_function(PyObject ***, int);
111#endif
112static PyObject * fast_function(PyObject *, PyObject ***, int, int, int);
113static PyObject * do_call(PyObject *, PyObject ***, int, int);
114static PyObject * ext_do_call(PyObject *, PyObject ***, int, int, int);
115static PyObject * update_keyword_args(PyObject *, int, PyObject ***,
116 PyObject *);
117static PyObject * update_star_args(int, int, PyObject *, PyObject ***);
118static PyObject * load_args(PyObject ***, int);
119#define CALL_FLAG_VAR 1
120#define CALL_FLAG_KW 2
121
122#ifdef LLTRACE
123static int lltrace;
124static int prtrace(PyObject *, char *);
125#endif
126static int call_trace(Py_tracefunc, PyObject *, PyFrameObject *,
127 int, PyObject *);
128static int call_trace_protected(Py_tracefunc, PyObject *,
129 PyFrameObject *, int, PyObject *);
130static void call_exc_trace(Py_tracefunc, PyObject *, PyFrameObject *);
131static int maybe_call_line_trace(Py_tracefunc, PyObject *,
132 PyFrameObject *, int *, int *, int *);
133
134static PyObject * apply_slice(PyObject *, PyObject *, PyObject *);
135static int assign_slice(PyObject *, PyObject *,
136 PyObject *, PyObject *);
137static PyObject * cmp_outcome(int, PyObject *, PyObject *);
138static PyObject * import_from(PyObject *, PyObject *);
139static int import_all_from(PyObject *, PyObject *);
140static PyObject * build_class(PyObject *, PyObject *, PyObject *);
141static int exec_statement(PyFrameObject *,
142 PyObject *, PyObject *, PyObject *);
143static void set_exc_info(PyThreadState *, PyObject *, PyObject *, PyObject *);
144static void reset_exc_info(PyThreadState *);
145static void format_exc_check_arg(PyObject *, char *, PyObject *);
146static PyObject * string_concatenate(PyObject *, PyObject *,
147 PyFrameObject *, unsigned char *);
148static PyObject * kwd_as_string(PyObject *);
149
150#define NAME_ERROR_MSG \
151 "name '%.200s' is not defined"
152#define GLOBAL_NAME_ERROR_MSG \
153 "global name '%.200s' is not defined"
154#define UNBOUNDLOCAL_ERROR_MSG \
155 "local variable '%.200s' referenced before assignment"
156#define UNBOUNDFREE_ERROR_MSG \
157 "free variable '%.200s' referenced before assignment" \
158 " in enclosing scope"
159
160/* Dynamic execution profile */
161#ifdef DYNAMIC_EXECUTION_PROFILE
162#ifdef DXPAIRS
163static long dxpairs[257][256];
164#define dxp dxpairs[256]
165#else
166static long dxp[256];
167#endif
168#endif
169
170/* Function call profile */
171#ifdef CALL_PROFILE
172#define PCALL_NUM 11
173static int pcall[PCALL_NUM];
174
175#define PCALL_ALL 0
176#define PCALL_FUNCTION 1
177#define PCALL_FAST_FUNCTION 2
178#define PCALL_FASTER_FUNCTION 3
179#define PCALL_METHOD 4
180#define PCALL_BOUND_METHOD 5
181#define PCALL_CFUNCTION 6
182#define PCALL_TYPE 7
183#define PCALL_GENERATOR 8
184#define PCALL_OTHER 9
185#define PCALL_POP 10
186
187/* Notes about the statistics
188
189 PCALL_FAST stats
190
191 FAST_FUNCTION means no argument tuple needs to be created.
192 FASTER_FUNCTION means that the fast-path frame setup code is used.
193
194 If there is a method call where the call can be optimized by changing
195 the argument tuple and calling the function directly, it gets recorded
196 twice.
197
198 As a result, the relationship among the statistics appears to be
199 PCALL_ALL == PCALL_FUNCTION + PCALL_METHOD - PCALL_BOUND_METHOD +
200 PCALL_CFUNCTION + PCALL_TYPE + PCALL_GENERATOR + PCALL_OTHER
201 PCALL_FUNCTION > PCALL_FAST_FUNCTION > PCALL_FASTER_FUNCTION
202 PCALL_METHOD > PCALL_BOUND_METHOD
203*/
204
205#define PCALL(POS) pcall[POS]++
206
207PyObject *
208PyEval_GetCallStats(PyObject *self)
209{
210 return Py_BuildValue("iiiiiiiiiii",
211 pcall[0], pcall[1], pcall[2], pcall[3],
212 pcall[4], pcall[5], pcall[6], pcall[7],
213 pcall[8], pcall[9], pcall[10]);
214}
215#else
216#define PCALL(O)
217
218PyObject *
219PyEval_GetCallStats(PyObject *self)
220{
221 Py_INCREF(Py_None);
222 return Py_None;
223}
224#endif
225
226
227#ifdef WITH_THREAD
228
229#ifdef HAVE_ERRNO_H
230#include <errno.h>
231#endif
232#include "pythread.h"
233
234static PyThread_type_lock interpreter_lock = 0; /* This is the GIL */
235static long main_thread = 0;
236
237int
238PyEval_ThreadsInitialized(void)
239{
240 return interpreter_lock != 0;
241}
242
243void
244PyEval_InitThreads(void)
245{
246 if (interpreter_lock)
247 return;
248 interpreter_lock = PyThread_allocate_lock();
249 PyThread_acquire_lock(interpreter_lock, 1);
250 main_thread = PyThread_get_thread_ident();
251}
252
253void
254PyEval_AcquireLock(void)
255{
256 PyThread_acquire_lock(interpreter_lock, 1);
257}
258
259void
260PyEval_ReleaseLock(void)
261{
262 PyThread_release_lock(interpreter_lock);
263}
264
265void
266PyEval_AcquireThread(PyThreadState *tstate)
267{
268 if (tstate == NULL)
269 Py_FatalError("PyEval_AcquireThread: NULL new thread state");
270 /* Check someone has called PyEval_InitThreads() to create the lock */
271 assert(interpreter_lock);
272 PyThread_acquire_lock(interpreter_lock, 1);
273 if (PyThreadState_Swap(tstate) != NULL)
274 Py_FatalError(
275 "PyEval_AcquireThread: non-NULL old thread state");
276}
277
278void
279PyEval_ReleaseThread(PyThreadState *tstate)
280{
281 if (tstate == NULL)
282 Py_FatalError("PyEval_ReleaseThread: NULL thread state");
283 if (PyThreadState_Swap(NULL) != tstate)
284 Py_FatalError("PyEval_ReleaseThread: wrong thread state");
285 PyThread_release_lock(interpreter_lock);
286}
287
288/* This function is called from PyOS_AfterFork to ensure that newly
289 created child processes don't hold locks referring to threads which
290 are not running in the child process. (This could also be done using
291 pthread_atfork mechanism, at least for the pthreads implementation.) */
292
293void
294PyEval_ReInitThreads(void)
295{
296 PyObject *threading, *result;
297 PyThreadState *tstate;
298
299 if (!interpreter_lock)
300 return;
301 /*XXX Can't use PyThread_free_lock here because it does too
302 much error-checking. Doing this cleanly would require
303 adding a new function to each thread_*.h. Instead, just
304 create a new lock and waste a little bit of memory */
305 interpreter_lock = PyThread_allocate_lock();
306 PyThread_acquire_lock(interpreter_lock, 1);
307 main_thread = PyThread_get_thread_ident();
308
309 /* Update the threading module with the new state.
310 */
311 tstate = PyThreadState_GET();
312 threading = PyMapping_GetItemString(tstate->interp->modules,
313 "threading");
314 if (threading == NULL) {
315 /* threading not imported */
316 PyErr_Clear();
317 return;
318 }
319 result = PyObject_CallMethod(threading, "_after_fork", NULL);
320 if (result == NULL)
321 PyErr_WriteUnraisable(threading);
322 else
323 Py_DECREF(result);
324 Py_DECREF(threading);
325}
326#endif
327
328/* Functions save_thread and restore_thread are always defined so
329 dynamically loaded modules needn't be compiled separately for use
330 with and without threads: */
331
332PyThreadState *
333PyEval_SaveThread(void)
334{
335 PyThreadState *tstate = PyThreadState_Swap(NULL);
336 if (tstate == NULL)
337 Py_FatalError("PyEval_SaveThread: NULL tstate");
338#ifdef WITH_THREAD
339 if (interpreter_lock)
340 PyThread_release_lock(interpreter_lock);
341#endif
342 return tstate;
343}
344
345void
346PyEval_RestoreThread(PyThreadState *tstate)
347{
348 if (tstate == NULL)
349 Py_FatalError("PyEval_RestoreThread: NULL tstate");
350#ifdef WITH_THREAD
351 if (interpreter_lock) {
352 int err = errno;
353 PyThread_acquire_lock(interpreter_lock, 1);
354 errno = err;
355 }
356#endif
357 PyThreadState_Swap(tstate);
358}
359
360
361/* Mechanism whereby asynchronously executing callbacks (e.g. UNIX
362 signal handlers or Mac I/O completion routines) can schedule calls
363 to a function to be called synchronously.
364 The synchronous function is called with one void* argument.
365 It should return 0 for success or -1 for failure -- failure should
366 be accompanied by an exception.
367
368 If registry succeeds, the registry function returns 0; if it fails
369 (e.g. due to too many pending calls) it returns -1 (without setting
370 an exception condition).
371
372 Note that because registry may occur from within signal handlers,
373 or other asynchronous events, calling malloc() is unsafe!
374
375#ifdef WITH_THREAD
376 Any thread can schedule pending calls, but only the main thread
377 will execute them.
378#endif
379
380 XXX WARNING! ASYNCHRONOUSLY EXECUTING CODE!
381 There are two possible race conditions:
382 (1) nested asynchronous registry calls;
383 (2) registry calls made while pending calls are being processed.
384 While (1) is very unlikely, (2) is a real possibility.
385 The current code is safe against (2), but not against (1).
386 The safety against (2) is derived from the fact that only one
387 thread (the main thread) ever takes things out of the queue.
388
389 XXX Darn! With the advent of thread state, we should have an array
390 of pending calls per thread in the thread state! Later...
391*/
392
393#define NPENDINGCALLS 32
394static struct {
395 int (*func)(void *);
396 void *arg;
397} pendingcalls[NPENDINGCALLS];
398static volatile int pendingfirst = 0;
399static volatile int pendinglast = 0;
400static volatile int things_to_do = 0;
401
402int
403Py_AddPendingCall(int (*func)(void *), void *arg)
404{
405 static volatile int busy = 0;
406 int i, j;
407 /* XXX Begin critical section */
408 /* XXX If you want this to be safe against nested
409 XXX asynchronous calls, you'll have to work harder! */
410 if (busy)
411 return -1;
412 busy = 1;
413 i = pendinglast;
414 j = (i + 1) % NPENDINGCALLS;
415 if (j == pendingfirst) {
416 busy = 0;
417 return -1; /* Queue full */
418 }
419 pendingcalls[i].func = func;
420 pendingcalls[i].arg = arg;
421 pendinglast = j;
422
423 _Py_Ticker = 0;
424 things_to_do = 1; /* Signal main loop */
425 busy = 0;
426 /* XXX End critical section */
427 return 0;
428}
429
430int
431Py_MakePendingCalls(void)
432{
433 static int busy = 0;
434#ifdef WITH_THREAD
435 if (main_thread && PyThread_get_thread_ident() != main_thread)
436 return 0;
437#endif
438 if (busy)
439 return 0;
440 busy = 1;
441 things_to_do = 0;
442 for (;;) {
443 int i;
444 int (*func)(void *);
445 void *arg;
446 i = pendingfirst;
447 if (i == pendinglast)
448 break; /* Queue empty */
449 func = pendingcalls[i].func;
450 arg = pendingcalls[i].arg;
451 pendingfirst = (i + 1) % NPENDINGCALLS;
452 if (func(arg) < 0) {
453 busy = 0;
454 things_to_do = 1; /* We're not done yet */
455 return -1;
456 }
457 }
458 busy = 0;
459 return 0;
460}
461
462
463/* The interpreter's recursion limit */
464
465#ifndef Py_DEFAULT_RECURSION_LIMIT
466#define Py_DEFAULT_RECURSION_LIMIT 1000
467#endif
468static int recursion_limit = Py_DEFAULT_RECURSION_LIMIT;
469int _Py_CheckRecursionLimit = Py_DEFAULT_RECURSION_LIMIT;
470
471int
472Py_GetRecursionLimit(void)
473{
474 return recursion_limit;
475}
476
477void
478Py_SetRecursionLimit(int new_limit)
479{
480 recursion_limit = new_limit;
481 _Py_CheckRecursionLimit = recursion_limit;
482}
483
484/* the macro Py_EnterRecursiveCall() only calls _Py_CheckRecursiveCall()
485 if the recursion_depth reaches _Py_CheckRecursionLimit.
486 If USE_STACKCHECK, the macro decrements _Py_CheckRecursionLimit
487 to guarantee that _Py_CheckRecursiveCall() is regularly called.
488 Without USE_STACKCHECK, there is no need for this. */
489int
490_Py_CheckRecursiveCall(char *where)
491{
492 PyThreadState *tstate = PyThreadState_GET();
493
494#ifdef USE_STACKCHECK
495 if (PyOS_CheckStack()) {
496 --tstate->recursion_depth;
497 PyErr_SetString(PyExc_MemoryError, "Stack overflow");
498 return -1;
499 }
500#endif
501 if (tstate->recursion_depth > recursion_limit) {
502 --tstate->recursion_depth;
503 PyErr_Format(PyExc_RuntimeError,
504 "maximum recursion depth exceeded%s",
505 where);
506 return -1;
507 }
508 _Py_CheckRecursionLimit = recursion_limit;
509 return 0;
510}
511
512/* Status code for main loop (reason for stack unwind) */
513enum why_code {
514 WHY_NOT = 0x0001, /* No error */
515 WHY_EXCEPTION = 0x0002, /* Exception occurred */
516 WHY_RERAISE = 0x0004, /* Exception re-raised by 'finally' */
517 WHY_RETURN = 0x0008, /* 'return' statement */
518 WHY_BREAK = 0x0010, /* 'break' statement */
519 WHY_CONTINUE = 0x0020, /* 'continue' statement */
520 WHY_YIELD = 0x0040 /* 'yield' operator */
521};
522
523static enum why_code do_raise(PyObject *, PyObject *, PyObject *);
524static int unpack_iterable(PyObject *, int, PyObject **);
525
526/* Records whether tracing is on for any thread. Counts the number of
527 threads for which tstate->c_tracefunc is non-NULL, so if the value
528 is 0, we know we don't have to check this thread's c_tracefunc.
529 This speeds up the if statement in PyEval_EvalFrameEx() after
530 fast_next_opcode*/
531static int _Py_TracingPossible = 0;
532
533/* for manipulating the thread switch and periodic "stuff" - used to be
534 per thread, now just a pair o' globals */
535int _Py_CheckInterval = 100;
536volatile int _Py_Ticker = 100;
537
538PyObject *
539PyEval_EvalCode(PyCodeObject *co, PyObject *globals, PyObject *locals)
540{
541 return PyEval_EvalCodeEx(co,
542 globals, locals,
543 (PyObject **)NULL, 0,
544 (PyObject **)NULL, 0,
545 (PyObject **)NULL, 0,
546 NULL);
547}
548
549
550/* Interpreter main loop */
551
552PyObject *
553PyEval_EvalFrame(PyFrameObject *f) {
554 /* This is for backward compatibility with extension modules that
555 used this API; core interpreter code should call
556 PyEval_EvalFrameEx() */
557 return PyEval_EvalFrameEx(f, 0);
558}
559
560PyObject *
561PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
562{
563#ifdef DXPAIRS
564 int lastopcode = 0;
565#endif
566 register PyObject **stack_pointer; /* Next free slot in value stack */
567 register unsigned char *next_instr;
568 register int opcode; /* Current opcode */
569 register int oparg; /* Current opcode argument, if any */
570 register enum why_code why; /* Reason for block stack unwind */
571 register int err; /* Error status -- nonzero if error */
572 register PyObject *x; /* Result object -- NULL if error */
573 register PyObject *v; /* Temporary objects popped off stack */
574 register PyObject *w;
575 register PyObject *u;
576 register PyObject *t;
577 register PyObject *stream = NULL; /* for PRINT opcodes */
578 register PyObject **fastlocals, **freevars;
579 PyObject *retval = NULL; /* Return value */
580 PyThreadState *tstate = PyThreadState_GET();
581 PyCodeObject *co;
582
583 /* when tracing we set things up so that
584
585 not (instr_lb <= current_bytecode_offset < instr_ub)
586
587 is true when the line being executed has changed. The
588 initial values are such as to make this false the first
589 time it is tested. */
590 int instr_ub = -1, instr_lb = 0, instr_prev = -1;
591
592 unsigned char *first_instr;
593 PyObject *names;
594 PyObject *consts;
595#if defined(Py_DEBUG) || defined(LLTRACE)
596 /* Make it easier to find out where we are with a debugger */
597 char *filename;
598#endif
599
600/* Tuple access macros */
601
602#ifndef Py_DEBUG
603#define GETITEM(v, i) PyTuple_GET_ITEM((PyTupleObject *)(v), (i))
604#else
605#define GETITEM(v, i) PyTuple_GetItem((v), (i))
606#endif
607
608#ifdef WITH_TSC
609/* Use Pentium timestamp counter to mark certain events:
610 inst0 -- beginning of switch statement for opcode dispatch
611 inst1 -- end of switch statement (may be skipped)
612 loop0 -- the top of the mainloop
613 loop1 -- place where control returns again to top of mainloop
614 (may be skipped)
615 intr1 -- beginning of long interruption
616 intr2 -- end of long interruption
617
618 Many opcodes call out to helper C functions. In some cases, the
619 time in those functions should be counted towards the time for the
620 opcode, but not in all cases. For example, a CALL_FUNCTION opcode
621 calls another Python function; there's no point in charge all the
622 bytecode executed by the called function to the caller.
623
624 It's hard to make a useful judgement statically. In the presence
625 of operator overloading, it's impossible to tell if a call will
626 execute new Python code or not.
627
628 It's a case-by-case judgement. I'll use intr1 for the following
629 cases:
630
631 EXEC_STMT
632 IMPORT_STAR
633 IMPORT_FROM
634 CALL_FUNCTION (and friends)
635
636 */
637 uint64 inst0, inst1, loop0, loop1, intr0 = 0, intr1 = 0;
638 int ticked = 0;
639
640 READ_TIMESTAMP(inst0);
641 READ_TIMESTAMP(inst1);
642 READ_TIMESTAMP(loop0);
643 READ_TIMESTAMP(loop1);
644
645 /* shut up the compiler */
646 opcode = 0;
647#endif
648
649/* Code access macros */
650
651#define INSTR_OFFSET() ((int)(next_instr - first_instr))
652#define NEXTOP() (*next_instr++)
653#define NEXTARG() (next_instr += 2, (next_instr[-1]<<8) + next_instr[-2])
654#define PEEKARG() ((next_instr[2]<<8) + next_instr[1])
655#define JUMPTO(x) (next_instr = first_instr + (x))
656#define JUMPBY(x) (next_instr += (x))
657
658/* OpCode prediction macros
659 Some opcodes tend to come in pairs thus making it possible to
660 predict the second code when the first is run. For example,
661 COMPARE_OP is often followed by JUMP_IF_FALSE or JUMP_IF_TRUE. And,
662 those opcodes are often followed by a POP_TOP.
663
664 Verifying the prediction costs a single high-speed test of a register
665 variable against a constant. If the pairing was good, then the
666 processor's own internal branch predication has a high likelihood of
667 success, resulting in a nearly zero-overhead transition to the
668 next opcode. A successful prediction saves a trip through the eval-loop
669 including its two unpredictable branches, the HAS_ARG test and the
670 switch-case. Combined with the processor's internal branch prediction,
671 a successful PREDICT has the effect of making the two opcodes run as if
672 they were a single new opcode with the bodies combined.
673
674 If collecting opcode statistics, your choices are to either keep the
675 predictions turned-on and interpret the results as if some opcodes
676 had been combined or turn-off predictions so that the opcode frequency
677 counter updates for both opcodes.
678*/
679
680#ifdef DYNAMIC_EXECUTION_PROFILE
681#define PREDICT(op) if (0) goto PRED_##op
682#else
683#define PREDICT(op) if (*next_instr == op) goto PRED_##op
684#endif
685
686#define PREDICTED(op) PRED_##op: next_instr++
687#define PREDICTED_WITH_ARG(op) PRED_##op: oparg = PEEKARG(); next_instr += 3
688
689/* Stack manipulation macros */
690
691/* The stack can grow at most MAXINT deep, as co_nlocals and
692 co_stacksize are ints. */
693#define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack))
694#define EMPTY() (STACK_LEVEL() == 0)
695#define TOP() (stack_pointer[-1])
696#define SECOND() (stack_pointer[-2])
697#define THIRD() (stack_pointer[-3])
698#define FOURTH() (stack_pointer[-4])
699#define SET_TOP(v) (stack_pointer[-1] = (v))
700#define SET_SECOND(v) (stack_pointer[-2] = (v))
701#define SET_THIRD(v) (stack_pointer[-3] = (v))
702#define SET_FOURTH(v) (stack_pointer[-4] = (v))
703#define BASIC_STACKADJ(n) (stack_pointer += n)
704#define BASIC_PUSH(v) (*stack_pointer++ = (v))
705#define BASIC_POP() (*--stack_pointer)
706
707#ifdef LLTRACE
708#define PUSH(v) { (void)(BASIC_PUSH(v), \
709 lltrace && prtrace(TOP(), "push")); \
710 assert(STACK_LEVEL() <= co->co_stacksize); }
711#define POP() ((void)(lltrace && prtrace(TOP(), "pop")), \
712 BASIC_POP())
713#define STACKADJ(n) { (void)(BASIC_STACKADJ(n), \
714 lltrace && prtrace(TOP(), "stackadj")); \
715 assert(STACK_LEVEL() <= co->co_stacksize); }
716#define EXT_POP(STACK_POINTER) ((void)(lltrace && \
717 prtrace((STACK_POINTER)[-1], "ext_pop")), \
718 *--(STACK_POINTER))
719#else
720#define PUSH(v) BASIC_PUSH(v)
721#define POP() BASIC_POP()
722#define STACKADJ(n) BASIC_STACKADJ(n)
723#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER))
724#endif
725
726/* Local variable macros */
727
728#define GETLOCAL(i) (fastlocals[i])
729
730/* The SETLOCAL() macro must not DECREF the local variable in-place and
731 then store the new value; it must copy the old value to a temporary
732 value, then store the new value, and then DECREF the temporary value.
733 This is because it is possible that during the DECREF the frame is
734 accessed by other code (e.g. a __del__ method or gc.collect()) and the
735 variable would be pointing to already-freed memory. */
736#define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \
737 GETLOCAL(i) = value; \
738 Py_XDECREF(tmp); } while (0)
739
740/* Start of code */
741
742 if (f == NULL)
743 return NULL;
744
745 /* push frame */
746 if (Py_EnterRecursiveCall(""))
747 return NULL;
748
749 tstate->frame = f;
750
751 if (tstate->use_tracing) {
752 if (tstate->c_tracefunc != NULL) {
753 /* tstate->c_tracefunc, if defined, is a
754 function that will be called on *every* entry
755 to a code block. Its return value, if not
756 None, is a function that will be called at
757 the start of each executed line of code.
758 (Actually, the function must return itself
759 in order to continue tracing.) The trace
760 functions are called with three arguments:
761 a pointer to the current frame, a string
762 indicating why the function is called, and
763 an argument which depends on the situation.
764 The global trace function is also called
765 whenever an exception is detected. */
766 if (call_trace_protected(tstate->c_tracefunc,
767 tstate->c_traceobj,
768 f, PyTrace_CALL, Py_None)) {
769 /* Trace function raised an error */
770 goto exit_eval_frame;
771 }
772 }
773 if (tstate->c_profilefunc != NULL) {
774 /* Similar for c_profilefunc, except it needn't
775 return itself and isn't called for "line" events */
776 if (call_trace_protected(tstate->c_profilefunc,
777 tstate->c_profileobj,
778 f, PyTrace_CALL, Py_None)) {
779 /* Profile function raised an error */
780 goto exit_eval_frame;
781 }
782 }
783 }
784
785 co = f->f_code;
786 names = co->co_names;
787 consts = co->co_consts;
788 fastlocals = f->f_localsplus;
789 freevars = f->f_localsplus + co->co_nlocals;
790 first_instr = (unsigned char*) PyString_AS_STRING(co->co_code);
791 /* An explanation is in order for the next line.
792
793 f->f_lasti now refers to the index of the last instruction
794 executed. You might think this was obvious from the name, but
795 this wasn't always true before 2.3! PyFrame_New now sets
796 f->f_lasti to -1 (i.e. the index *before* the first instruction)
797 and YIELD_VALUE doesn't fiddle with f_lasti any more. So this
798 does work. Promise.
799
800 When the PREDICT() macros are enabled, some opcode pairs follow in
801 direct succession without updating f->f_lasti. A successful
802 prediction effectively links the two codes together as if they
803 were a single new opcode; accordingly,f->f_lasti will point to
804 the first code in the pair (for instance, GET_ITER followed by
805 FOR_ITER is effectively a single opcode and f->f_lasti will point
806 at to the beginning of the combined pair.)
807 */
808 next_instr = first_instr + f->f_lasti + 1;
809 stack_pointer = f->f_stacktop;
810 assert(stack_pointer != NULL);
811 f->f_stacktop = NULL; /* remains NULL unless yield suspends frame */
812
813#ifdef LLTRACE
814 lltrace = PyDict_GetItemString(f->f_globals, "__lltrace__") != NULL;
815#endif
816#if defined(Py_DEBUG) || defined(LLTRACE)
817 filename = PyString_AsString(co->co_filename);
818#endif
819
820 why = WHY_NOT;
821 err = 0;
822 x = Py_None; /* Not a reference, just anything non-NULL */
823 w = NULL;
824
825 if (throwflag) { /* support for generator.throw() */
826 why = WHY_EXCEPTION;
827 goto on_error;
828 }
829
830 for (;;) {
831#ifdef WITH_TSC
832 if (inst1 == 0) {
833 /* Almost surely, the opcode executed a break
834 or a continue, preventing inst1 from being set
835 on the way out of the loop.
836 */
837 READ_TIMESTAMP(inst1);
838 loop1 = inst1;
839 }
840 dump_tsc(opcode, ticked, inst0, inst1, loop0, loop1,
841 intr0, intr1);
842 ticked = 0;
843 inst1 = 0;
844 intr0 = 0;
845 intr1 = 0;
846 READ_TIMESTAMP(loop0);
847#endif
848 assert(stack_pointer >= f->f_valuestack); /* else underflow */
849 assert(STACK_LEVEL() <= co->co_stacksize); /* else overflow */
850
851 /* Do periodic things. Doing this every time through
852 the loop would add too much overhead, so we do it
853 only every Nth instruction. We also do it if
854 ``things_to_do'' is set, i.e. when an asynchronous
855 event needs attention (e.g. a signal handler or
856 async I/O handler); see Py_AddPendingCall() and
857 Py_MakePendingCalls() above. */
858
859 if (--_Py_Ticker < 0) {
860 if (*next_instr == SETUP_FINALLY) {
861 /* Make the last opcode before
862 a try: finally: block uninterruptable. */
863 goto fast_next_opcode;
864 }
865 _Py_Ticker = _Py_CheckInterval;
866 tstate->tick_counter++;
867#ifdef WITH_TSC
868 ticked = 1;
869#endif
870 if (things_to_do) {
871 if (Py_MakePendingCalls() < 0) {
872 why = WHY_EXCEPTION;
873 goto on_error;
874 }
875 if (things_to_do)
876 /* MakePendingCalls() didn't succeed.
877 Force early re-execution of this
878 "periodic" code, possibly after
879 a thread switch */
880 _Py_Ticker = 0;
881 }
882#ifdef WITH_THREAD
883 if (interpreter_lock) {
884 /* Give another thread a chance */
885
886 if (PyThreadState_Swap(NULL) != tstate)
887 Py_FatalError("ceval: tstate mix-up");
888 PyThread_release_lock(interpreter_lock);
889
890 /* Other threads may run now */
891
892 PyThread_acquire_lock(interpreter_lock, 1);
893 if (PyThreadState_Swap(tstate) != NULL)
894 Py_FatalError("ceval: orphan tstate");
895
896 /* Check for thread interrupts */
897
898 if (tstate->async_exc != NULL) {
899 x = tstate->async_exc;
900 tstate->async_exc = NULL;
901 PyErr_SetNone(x);
902 Py_DECREF(x);
903 why = WHY_EXCEPTION;
904 goto on_error;
905 }
906 }
907#endif
908 }
909
910 fast_next_opcode:
911 f->f_lasti = INSTR_OFFSET();
912
913 /* line-by-line tracing support */
914
915 if (_Py_TracingPossible &&
916 tstate->c_tracefunc != NULL && !tstate->tracing) {
917 /* see maybe_call_line_trace
918 for expository comments */
919 f->f_stacktop = stack_pointer;
920
921 err = maybe_call_line_trace(tstate->c_tracefunc,
922 tstate->c_traceobj,
923 f, &instr_lb, &instr_ub,
924 &instr_prev);
925 /* Reload possibly changed frame fields */
926 JUMPTO(f->f_lasti);
927 if (f->f_stacktop != NULL) {
928 stack_pointer = f->f_stacktop;
929 f->f_stacktop = NULL;
930 }
931 if (err) {
932 /* trace function raised an exception */
933 goto on_error;
934 }
935 }
936
937 /* Extract opcode and argument */
938
939 opcode = NEXTOP();
940 oparg = 0; /* allows oparg to be stored in a register because
941 it doesn't have to be remembered across a full loop */
942 if (HAS_ARG(opcode))
943 oparg = NEXTARG();
944 dispatch_opcode:
945#ifdef DYNAMIC_EXECUTION_PROFILE
946#ifdef DXPAIRS
947 dxpairs[lastopcode][opcode]++;
948 lastopcode = opcode;
949#endif
950 dxp[opcode]++;
951#endif
952
953#ifdef LLTRACE
954 /* Instruction tracing */
955
956 if (lltrace) {
957 if (HAS_ARG(opcode)) {
958 printf("%d: %d, %d\n",
959 f->f_lasti, opcode, oparg);
960 }
961 else {
962 printf("%d: %d\n",
963 f->f_lasti, opcode);
964 }
965 }
966#endif
967
968 /* Main switch on opcode */
969 READ_TIMESTAMP(inst0);
970
971 switch (opcode) {
972
973 /* BEWARE!
974 It is essential that any operation that fails sets either
975 x to NULL, err to nonzero, or why to anything but WHY_NOT,
976 and that no operation that succeeds does this! */
977
978 /* case STOP_CODE: this is an error! */
979
980 case NOP:
981 goto fast_next_opcode;
982
983 case LOAD_FAST:
984 x = GETLOCAL(oparg);
985 if (x != NULL) {
986 Py_INCREF(x);
987 PUSH(x);
988 goto fast_next_opcode;
989 }
990 format_exc_check_arg(PyExc_UnboundLocalError,
991 UNBOUNDLOCAL_ERROR_MSG,
992 PyTuple_GetItem(co->co_varnames, oparg));
993 break;
994
995 case LOAD_CONST:
996 x = GETITEM(consts, oparg);
997 Py_INCREF(x);
998 PUSH(x);
999 goto fast_next_opcode;
1000
1001 PREDICTED_WITH_ARG(STORE_FAST);
1002 case STORE_FAST:
1003 v = POP();
1004 SETLOCAL(oparg, v);
1005 goto fast_next_opcode;
1006
1007 PREDICTED(POP_TOP);
1008 case POP_TOP:
1009 v = POP();
1010 Py_DECREF(v);
1011 goto fast_next_opcode;
1012
1013 case ROT_TWO:
1014 v = TOP();
1015 w = SECOND();
1016 SET_TOP(w);
1017 SET_SECOND(v);
1018 goto fast_next_opcode;
1019
1020 case ROT_THREE:
1021 v = TOP();
1022 w = SECOND();
1023 x = THIRD();
1024 SET_TOP(w);
1025 SET_SECOND(x);
1026 SET_THIRD(v);
1027 goto fast_next_opcode;
1028
1029 case ROT_FOUR:
1030 u = TOP();
1031 v = SECOND();
1032 w = THIRD();
1033 x = FOURTH();
1034 SET_TOP(v);
1035 SET_SECOND(w);
1036 SET_THIRD(x);
1037 SET_FOURTH(u);
1038 goto fast_next_opcode;
1039
1040 case DUP_TOP:
1041 v = TOP();
1042 Py_INCREF(v);
1043 PUSH(v);
1044 goto fast_next_opcode;
1045
1046 case DUP_TOPX:
1047 if (oparg == 2) {
1048 x = TOP();
1049 Py_INCREF(x);
1050 w = SECOND();
1051 Py_INCREF(w);
1052 STACKADJ(2);
1053 SET_TOP(x);
1054 SET_SECOND(w);
1055 goto fast_next_opcode;
1056 } else if (oparg == 3) {
1057 x = TOP();
1058 Py_INCREF(x);
1059 w = SECOND();
1060 Py_INCREF(w);
1061 v = THIRD();
1062 Py_INCREF(v);
1063 STACKADJ(3);
1064 SET_TOP(x);
1065 SET_SECOND(w);
1066 SET_THIRD(v);
1067 goto fast_next_opcode;
1068 }
1069 Py_FatalError("invalid argument to DUP_TOPX"
1070 " (bytecode corruption?)");
1071 /* Never returns, so don't bother to set why. */
1072 break;
1073
1074 case UNARY_POSITIVE:
1075 v = TOP();
1076 x = PyNumber_Positive(v);
1077 Py_DECREF(v);
1078 SET_TOP(x);
1079 if (x != NULL) continue;
1080 break;
1081
1082 case UNARY_NEGATIVE:
1083 v = TOP();
1084 x = PyNumber_Negative(v);
1085 Py_DECREF(v);
1086 SET_TOP(x);
1087 if (x != NULL) continue;
1088 break;
1089
1090 case UNARY_NOT:
1091 v = TOP();
1092 err = PyObject_IsTrue(v);
1093 Py_DECREF(v);
1094 if (err == 0) {
1095 Py_INCREF(Py_True);
1096 SET_TOP(Py_True);
1097 continue;
1098 }
1099 else if (err > 0) {
1100 Py_INCREF(Py_False);
1101 SET_TOP(Py_False);
1102 err = 0;
1103 continue;
1104 }
1105 STACKADJ(-1);
1106 break;
1107
1108 case UNARY_CONVERT:
1109 v = TOP();
1110 x = PyObject_Repr(v);
1111 Py_DECREF(v);
1112 SET_TOP(x);
1113 if (x != NULL) continue;
1114 break;
1115
1116 case UNARY_INVERT:
1117 v = TOP();
1118 x = PyNumber_Invert(v);
1119 Py_DECREF(v);
1120 SET_TOP(x);
1121 if (x != NULL) continue;
1122 break;
1123
1124 case BINARY_POWER:
1125 w = POP();
1126 v = TOP();
1127 x = PyNumber_Power(v, w, Py_None);
1128 Py_DECREF(v);
1129 Py_DECREF(w);
1130 SET_TOP(x);
1131 if (x != NULL) continue;
1132 break;
1133
1134 case BINARY_MULTIPLY:
1135 w = POP();
1136 v = TOP();
1137 x = PyNumber_Multiply(v, w);
1138 Py_DECREF(v);
1139 Py_DECREF(w);
1140 SET_TOP(x);
1141 if (x != NULL) continue;
1142 break;
1143
1144 case BINARY_DIVIDE:
1145 if (!_Py_QnewFlag) {
1146 w = POP();
1147 v = TOP();
1148 x = PyNumber_Divide(v, w);
1149 Py_DECREF(v);
1150 Py_DECREF(w);
1151 SET_TOP(x);
1152 if (x != NULL) continue;
1153 break;
1154 }
1155 /* -Qnew is in effect: fall through to
1156 BINARY_TRUE_DIVIDE */
1157 case BINARY_TRUE_DIVIDE:
1158 w = POP();
1159 v = TOP();
1160 x = PyNumber_TrueDivide(v, w);
1161 Py_DECREF(v);
1162 Py_DECREF(w);
1163 SET_TOP(x);
1164 if (x != NULL) continue;
1165 break;
1166
1167 case BINARY_FLOOR_DIVIDE:
1168 w = POP();
1169 v = TOP();
1170 x = PyNumber_FloorDivide(v, w);
1171 Py_DECREF(v);
1172 Py_DECREF(w);
1173 SET_TOP(x);
1174 if (x != NULL) continue;
1175 break;
1176
1177 case BINARY_MODULO:
1178 w = POP();
1179 v = TOP();
1180 x = PyNumber_Remainder(v, w);
1181 Py_DECREF(v);
1182 Py_DECREF(w);
1183 SET_TOP(x);
1184 if (x != NULL) continue;
1185 break;
1186
1187 case BINARY_ADD:
1188 w = POP();
1189 v = TOP();
1190 if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) {
1191 /* INLINE: int + int */
1192 register long a, b, i;
1193 a = PyInt_AS_LONG(v);
1194 b = PyInt_AS_LONG(w);
1195 /* cast to avoid undefined behaviour
1196 on overflow */
1197 i = (long)((unsigned long)a + b);
1198 if ((i^a) < 0 && (i^b) < 0)
1199 goto slow_add;
1200 x = PyInt_FromLong(i);
1201 }
1202 else if (PyString_CheckExact(v) &&
1203 PyString_CheckExact(w)) {
1204 x = string_concatenate(v, w, f, next_instr);
1205 /* string_concatenate consumed the ref to v */
1206 goto skip_decref_vx;
1207 }
1208 else {
1209 slow_add:
1210 x = PyNumber_Add(v, w);
1211 }
1212 Py_DECREF(v);
1213 skip_decref_vx:
1214 Py_DECREF(w);
1215 SET_TOP(x);
1216 if (x != NULL) continue;
1217 break;
1218
1219 case BINARY_SUBTRACT:
1220 w = POP();
1221 v = TOP();
1222 if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) {
1223 /* INLINE: int - int */
1224 register long a, b, i;
1225 a = PyInt_AS_LONG(v);
1226 b = PyInt_AS_LONG(w);
1227 /* cast to avoid undefined behaviour
1228 on overflow */
1229 i = (long)((unsigned long)a - b);
1230 if ((i^a) < 0 && (i^~b) < 0)
1231 goto slow_sub;
1232 x = PyInt_FromLong(i);
1233 }
1234 else {
1235 slow_sub:
1236 x = PyNumber_Subtract(v, w);
1237 }
1238 Py_DECREF(v);
1239 Py_DECREF(w);
1240 SET_TOP(x);
1241 if (x != NULL) continue;
1242 break;
1243
1244 case BINARY_SUBSCR:
1245 w = POP();
1246 v = TOP();
1247 if (PyList_CheckExact(v) && PyInt_CheckExact(w)) {
1248 /* INLINE: list[int] */
1249 Py_ssize_t i = PyInt_AsSsize_t(w);
1250 if (i < 0)
1251 i += PyList_GET_SIZE(v);
1252 if (i >= 0 && i < PyList_GET_SIZE(v)) {
1253 x = PyList_GET_ITEM(v, i);
1254 Py_INCREF(x);
1255 }
1256 else
1257 goto slow_get;
1258 }
1259 else
1260 slow_get:
1261 x = PyObject_GetItem(v, w);
1262 Py_DECREF(v);
1263 Py_DECREF(w);
1264 SET_TOP(x);
1265 if (x != NULL) continue;
1266 break;
1267
1268 case BINARY_LSHIFT:
1269 w = POP();
1270 v = TOP();
1271 x = PyNumber_Lshift(v, w);
1272 Py_DECREF(v);
1273 Py_DECREF(w);
1274 SET_TOP(x);
1275 if (x != NULL) continue;
1276 break;
1277
1278 case BINARY_RSHIFT:
1279 w = POP();
1280 v = TOP();
1281 x = PyNumber_Rshift(v, w);
1282 Py_DECREF(v);
1283 Py_DECREF(w);
1284 SET_TOP(x);
1285 if (x != NULL) continue;
1286 break;
1287
1288 case BINARY_AND:
1289 w = POP();
1290 v = TOP();
1291 x = PyNumber_And(v, w);
1292 Py_DECREF(v);
1293 Py_DECREF(w);
1294 SET_TOP(x);
1295 if (x != NULL) continue;
1296 break;
1297
1298 case BINARY_XOR:
1299 w = POP();
1300 v = TOP();
1301 x = PyNumber_Xor(v, w);
1302 Py_DECREF(v);
1303 Py_DECREF(w);
1304 SET_TOP(x);
1305 if (x != NULL) continue;
1306 break;
1307
1308 case BINARY_OR:
1309 w = POP();
1310 v = TOP();
1311 x = PyNumber_Or(v, w);
1312 Py_DECREF(v);
1313 Py_DECREF(w);
1314 SET_TOP(x);
1315 if (x != NULL) continue;
1316 break;
1317
1318 case LIST_APPEND:
1319 w = POP();
1320 v = POP();
1321 err = PyList_Append(v, w);
1322 Py_DECREF(v);
1323 Py_DECREF(w);
1324 if (err == 0) {
1325 PREDICT(JUMP_ABSOLUTE);
1326 continue;
1327 }
1328 break;
1329
1330 case INPLACE_POWER:
1331 w = POP();
1332 v = TOP();
1333 x = PyNumber_InPlacePower(v, w, Py_None);
1334 Py_DECREF(v);
1335 Py_DECREF(w);
1336 SET_TOP(x);
1337 if (x != NULL) continue;
1338 break;
1339
1340 case INPLACE_MULTIPLY:
1341 w = POP();
1342 v = TOP();
1343 x = PyNumber_InPlaceMultiply(v, w);
1344 Py_DECREF(v);
1345 Py_DECREF(w);
1346 SET_TOP(x);
1347 if (x != NULL) continue;
1348 break;
1349
1350 case INPLACE_DIVIDE:
1351 if (!_Py_QnewFlag) {
1352 w = POP();
1353 v = TOP();
1354 x = PyNumber_InPlaceDivide(v, w);
1355 Py_DECREF(v);
1356 Py_DECREF(w);
1357 SET_TOP(x);
1358 if (x != NULL) continue;
1359 break;
1360 }
1361 /* -Qnew is in effect: fall through to
1362 INPLACE_TRUE_DIVIDE */
1363 case INPLACE_TRUE_DIVIDE:
1364 w = POP();
1365 v = TOP();
1366 x = PyNumber_InPlaceTrueDivide(v, w);
1367 Py_DECREF(v);
1368 Py_DECREF(w);
1369 SET_TOP(x);
1370 if (x != NULL) continue;
1371 break;
1372
1373 case INPLACE_FLOOR_DIVIDE:
1374 w = POP();
1375 v = TOP();
1376 x = PyNumber_InPlaceFloorDivide(v, w);
1377 Py_DECREF(v);
1378 Py_DECREF(w);
1379 SET_TOP(x);
1380 if (x != NULL) continue;
1381 break;
1382
1383 case INPLACE_MODULO:
1384 w = POP();
1385 v = TOP();
1386 x = PyNumber_InPlaceRemainder(v, w);
1387 Py_DECREF(v);
1388 Py_DECREF(w);
1389 SET_TOP(x);
1390 if (x != NULL) continue;
1391 break;
1392
1393 case INPLACE_ADD:
1394 w = POP();
1395 v = TOP();
1396 if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) {
1397 /* INLINE: int + int */
1398 register long a, b, i;
1399 a = PyInt_AS_LONG(v);
1400 b = PyInt_AS_LONG(w);
1401 i = a + b;
1402 if ((i^a) < 0 && (i^b) < 0)
1403 goto slow_iadd;
1404 x = PyInt_FromLong(i);
1405 }
1406 else if (PyString_CheckExact(v) &&
1407 PyString_CheckExact(w)) {
1408 x = string_concatenate(v, w, f, next_instr);
1409 /* string_concatenate consumed the ref to v */
1410 goto skip_decref_v;
1411 }
1412 else {
1413 slow_iadd:
1414 x = PyNumber_InPlaceAdd(v, w);
1415 }
1416 Py_DECREF(v);
1417 skip_decref_v:
1418 Py_DECREF(w);
1419 SET_TOP(x);
1420 if (x != NULL) continue;
1421 break;
1422
1423 case INPLACE_SUBTRACT:
1424 w = POP();
1425 v = TOP();
1426 if (PyInt_CheckExact(v) && PyInt_CheckExact(w)) {
1427 /* INLINE: int - int */
1428 register long a, b, i;
1429 a = PyInt_AS_LONG(v);
1430 b = PyInt_AS_LONG(w);
1431 i = a - b;
1432 if ((i^a) < 0 && (i^~b) < 0)
1433 goto slow_isub;
1434 x = PyInt_FromLong(i);
1435 }
1436 else {
1437 slow_isub:
1438 x = PyNumber_InPlaceSubtract(v, w);
1439 }
1440 Py_DECREF(v);
1441 Py_DECREF(w);
1442 SET_TOP(x);
1443 if (x != NULL) continue;
1444 break;
1445
1446 case INPLACE_LSHIFT:
1447 w = POP();
1448 v = TOP();
1449 x = PyNumber_InPlaceLshift(v, w);
1450 Py_DECREF(v);
1451 Py_DECREF(w);
1452 SET_TOP(x);
1453 if (x != NULL) continue;
1454 break;
1455
1456 case INPLACE_RSHIFT:
1457 w = POP();
1458 v = TOP();
1459 x = PyNumber_InPlaceRshift(v, w);
1460 Py_DECREF(v);
1461 Py_DECREF(w);
1462 SET_TOP(x);
1463 if (x != NULL) continue;
1464 break;
1465
1466 case INPLACE_AND:
1467 w = POP();
1468 v = TOP();
1469 x = PyNumber_InPlaceAnd(v, w);
1470 Py_DECREF(v);
1471 Py_DECREF(w);
1472 SET_TOP(x);
1473 if (x != NULL) continue;
1474 break;
1475
1476 case INPLACE_XOR:
1477 w = POP();
1478 v = TOP();
1479 x = PyNumber_InPlaceXor(v, w);
1480 Py_DECREF(v);
1481 Py_DECREF(w);
1482 SET_TOP(x);
1483 if (x != NULL) continue;
1484 break;
1485
1486 case INPLACE_OR:
1487 w = POP();
1488 v = TOP();
1489 x = PyNumber_InPlaceOr(v, w);
1490 Py_DECREF(v);
1491 Py_DECREF(w);
1492 SET_TOP(x);
1493 if (x != NULL) continue;
1494 break;
1495
1496 case SLICE+0:
1497 case SLICE+1:
1498 case SLICE+2:
1499 case SLICE+3:
1500 if ((opcode-SLICE) & 2)
1501 w = POP();
1502 else
1503 w = NULL;
1504 if ((opcode-SLICE) & 1)
1505 v = POP();
1506 else
1507 v = NULL;
1508 u = TOP();
1509 x = apply_slice(u, v, w);
1510 Py_DECREF(u);
1511 Py_XDECREF(v);
1512 Py_XDECREF(w);
1513 SET_TOP(x);
1514 if (x != NULL) continue;
1515 break;
1516
1517 case STORE_SLICE+0:
1518 case STORE_SLICE+1:
1519 case STORE_SLICE+2:
1520 case STORE_SLICE+3:
1521 if ((opcode-STORE_SLICE) & 2)
1522 w = POP();
1523 else
1524 w = NULL;
1525 if ((opcode-STORE_SLICE) & 1)
1526 v = POP();
1527 else
1528 v = NULL;
1529 u = POP();
1530 t = POP();
1531 err = assign_slice(u, v, w, t); /* u[v:w] = t */
1532 Py_DECREF(t);
1533 Py_DECREF(u);
1534 Py_XDECREF(v);
1535 Py_XDECREF(w);
1536 if (err == 0) continue;
1537 break;
1538
1539 case DELETE_SLICE+0:
1540 case DELETE_SLICE+1:
1541 case DELETE_SLICE+2:
1542 case DELETE_SLICE+3:
1543 if ((opcode-DELETE_SLICE) & 2)
1544 w = POP();
1545 else
1546 w = NULL;
1547 if ((opcode-DELETE_SLICE) & 1)
1548 v = POP();
1549 else
1550 v = NULL;
1551 u = POP();
1552 err = assign_slice(u, v, w, (PyObject *)NULL);
1553 /* del u[v:w] */
1554 Py_DECREF(u);
1555 Py_XDECREF(v);
1556 Py_XDECREF(w);
1557 if (err == 0) continue;
1558 break;
1559
1560 case STORE_SUBSCR:
1561 w = TOP();
1562 v = SECOND();
1563 u = THIRD();
1564 STACKADJ(-3);
1565 /* v[w] = u */
1566 err = PyObject_SetItem(v, w, u);
1567 Py_DECREF(u);
1568 Py_DECREF(v);
1569 Py_DECREF(w);
1570 if (err == 0) continue;
1571 break;
1572
1573 case DELETE_SUBSCR:
1574 w = TOP();
1575 v = SECOND();
1576 STACKADJ(-2);
1577 /* del v[w] */
1578 err = PyObject_DelItem(v, w);
1579 Py_DECREF(v);
1580 Py_DECREF(w);
1581 if (err == 0) continue;
1582 break;
1583
1584 case PRINT_EXPR:
1585 v = POP();
1586 w = PySys_GetObject("displayhook");
1587 if (w == NULL) {
1588 PyErr_SetString(PyExc_RuntimeError,
1589 "lost sys.displayhook");
1590 err = -1;
1591 x = NULL;
1592 }
1593 if (err == 0) {
1594 x = PyTuple_Pack(1, v);
1595 if (x == NULL)
1596 err = -1;
1597 }
1598 if (err == 0) {
1599 w = PyEval_CallObject(w, x);
1600 Py_XDECREF(w);
1601 if (w == NULL)
1602 err = -1;
1603 }
1604 Py_DECREF(v);
1605 Py_XDECREF(x);
1606 break;
1607
1608 case PRINT_ITEM_TO:
1609 w = stream = POP();
1610 /* fall through to PRINT_ITEM */
1611
1612 case PRINT_ITEM:
1613 v = POP();
1614 if (stream == NULL || stream == Py_None) {
1615 w = PySys_GetObject("stdout");
1616 if (w == NULL) {
1617 PyErr_SetString(PyExc_RuntimeError,
1618 "lost sys.stdout");
1619 err = -1;
1620 }
1621 }
1622 /* PyFile_SoftSpace() can exececute arbitrary code
1623 if sys.stdout is an instance with a __getattr__.
1624 If __getattr__ raises an exception, w will
1625 be freed, so we need to prevent that temporarily. */
1626 Py_XINCREF(w);
1627 if (w != NULL && PyFile_SoftSpace(w, 0))
1628 err = PyFile_WriteString(" ", w);
1629 if (err == 0)
1630 err = PyFile_WriteObject(v, w, Py_PRINT_RAW);
1631 if (err == 0) {
1632 /* XXX move into writeobject() ? */
1633 if (PyString_Check(v)) {
1634 char *s = PyString_AS_STRING(v);
1635 Py_ssize_t len = PyString_GET_SIZE(v);
1636 if (len == 0 ||
1637 !isspace(Py_CHARMASK(s[len-1])) ||
1638 s[len-1] == ' ')
1639 PyFile_SoftSpace(w, 1);
1640 }
1641#ifdef Py_USING_UNICODE
1642 else if (PyUnicode_Check(v)) {
1643 Py_UNICODE *s = PyUnicode_AS_UNICODE(v);
1644 Py_ssize_t len = PyUnicode_GET_SIZE(v);
1645 if (len == 0 ||
1646 !Py_UNICODE_ISSPACE(s[len-1]) ||
1647 s[len-1] == ' ')
1648 PyFile_SoftSpace(w, 1);
1649 }
1650#endif
1651 else
1652 PyFile_SoftSpace(w, 1);
1653 }
1654 Py_XDECREF(w);
1655 Py_DECREF(v);
1656 Py_XDECREF(stream);
1657 stream = NULL;
1658 if (err == 0)
1659 continue;
1660 break;
1661
1662 case PRINT_NEWLINE_TO:
1663 w = stream = POP();
1664 /* fall through to PRINT_NEWLINE */
1665
1666 case PRINT_NEWLINE:
1667 if (stream == NULL || stream == Py_None) {
1668 w = PySys_GetObject("stdout");
1669 if (w == NULL) {
1670 PyErr_SetString(PyExc_RuntimeError,
1671 "lost sys.stdout");
1672 why = WHY_EXCEPTION;
1673 }
1674 }
1675 if (w != NULL) {
1676 /* w.write() may replace sys.stdout, so we
1677 * have to keep our reference to it */
1678 Py_INCREF(w);
1679 err = PyFile_WriteString("\n", w);
1680 if (err == 0)
1681 PyFile_SoftSpace(w, 0);
1682 Py_DECREF(w);
1683 }
1684 Py_XDECREF(stream);
1685 stream = NULL;
1686 break;
1687
1688
1689#ifdef CASE_TOO_BIG
1690 default: switch (opcode) {
1691#endif
1692 case RAISE_VARARGS:
1693 u = v = w = NULL;
1694 switch (oparg) {
1695 case 3:
1696 u = POP(); /* traceback */
1697 /* Fallthrough */
1698 case 2:
1699 v = POP(); /* value */
1700 /* Fallthrough */
1701 case 1:
1702 w = POP(); /* exc */
1703 case 0: /* Fallthrough */
1704 why = do_raise(w, v, u);
1705 break;
1706 default:
1707 PyErr_SetString(PyExc_SystemError,
1708 "bad RAISE_VARARGS oparg");
1709 why = WHY_EXCEPTION;
1710 break;
1711 }
1712 break;
1713
1714 case LOAD_LOCALS:
1715 if ((x = f->f_locals) != NULL) {
1716 Py_INCREF(x);
1717 PUSH(x);
1718 continue;
1719 }
1720 PyErr_SetString(PyExc_SystemError, "no locals");
1721 break;
1722
1723 case RETURN_VALUE:
1724 retval = POP();
1725 why = WHY_RETURN;
1726 goto fast_block_end;
1727
1728 case YIELD_VALUE:
1729 retval = POP();
1730 f->f_stacktop = stack_pointer;
1731 why = WHY_YIELD;
1732 goto fast_yield;
1733
1734 case EXEC_STMT:
1735 w = TOP();
1736 v = SECOND();
1737 u = THIRD();
1738 STACKADJ(-3);
1739 READ_TIMESTAMP(intr0);
1740 err = exec_statement(f, u, v, w);
1741 READ_TIMESTAMP(intr1);
1742 Py_DECREF(u);
1743 Py_DECREF(v);
1744 Py_DECREF(w);
1745 break;
1746
1747 case POP_BLOCK:
1748 {
1749 PyTryBlock *b = PyFrame_BlockPop(f);
1750 while (STACK_LEVEL() > b->b_level) {
1751 v = POP();
1752 Py_DECREF(v);
1753 }
1754 }
1755 continue;
1756
1757 PREDICTED(END_FINALLY);
1758 case END_FINALLY:
1759 v = POP();
1760 if (PyInt_Check(v)) {
1761 why = (enum why_code) PyInt_AS_LONG(v);
1762 assert(why != WHY_YIELD);
1763 if (why == WHY_RETURN ||
1764 why == WHY_CONTINUE)
1765 retval = POP();
1766 }
1767 else if (PyExceptionClass_Check(v) ||
1768 PyString_Check(v)) {
1769 w = POP();
1770 u = POP();
1771 PyErr_Restore(v, w, u);
1772 why = WHY_RERAISE;
1773 break;
1774 }
1775 else if (v != Py_None) {
1776 PyErr_SetString(PyExc_SystemError,
1777 "'finally' pops bad exception");
1778 why = WHY_EXCEPTION;
1779 }
1780 Py_DECREF(v);
1781 break;
1782
1783 case BUILD_CLASS:
1784 u = TOP();
1785 v = SECOND();
1786 w = THIRD();
1787 STACKADJ(-2);
1788 x = build_class(u, v, w);
1789 SET_TOP(x);
1790 Py_DECREF(u);
1791 Py_DECREF(v);
1792 Py_DECREF(w);
1793 break;
1794
1795 case STORE_NAME:
1796 w = GETITEM(names, oparg);
1797 v = POP();
1798 if ((x = f->f_locals) != NULL) {
1799 if (PyDict_CheckExact(x))
1800 err = PyDict_SetItem(x, w, v);
1801 else
1802 err = PyObject_SetItem(x, w, v);
1803 Py_DECREF(v);
1804 if (err == 0) continue;
1805 break;
1806 }
1807 PyErr_Format(PyExc_SystemError,
1808 "no locals found when storing %s",
1809 PyObject_REPR(w));
1810 break;
1811
1812 case DELETE_NAME:
1813 w = GETITEM(names, oparg);
1814 if ((x = f->f_locals) != NULL) {
1815 if ((err = PyObject_DelItem(x, w)) != 0)
1816 format_exc_check_arg(PyExc_NameError,
1817 NAME_ERROR_MSG,
1818 w);
1819 break;
1820 }
1821 PyErr_Format(PyExc_SystemError,
1822 "no locals when deleting %s",
1823 PyObject_REPR(w));
1824 break;
1825
1826 PREDICTED_WITH_ARG(UNPACK_SEQUENCE);
1827 case UNPACK_SEQUENCE:
1828 v = POP();
1829 if (PyTuple_CheckExact(v) &&
1830 PyTuple_GET_SIZE(v) == oparg) {
1831 PyObject **items = \
1832 ((PyTupleObject *)v)->ob_item;
1833 while (oparg--) {
1834 w = items[oparg];
1835 Py_INCREF(w);
1836 PUSH(w);
1837 }
1838 Py_DECREF(v);
1839 continue;
1840 } else if (PyList_CheckExact(v) &&
1841 PyList_GET_SIZE(v) == oparg) {
1842 PyObject **items = \
1843 ((PyListObject *)v)->ob_item;
1844 while (oparg--) {
1845 w = items[oparg];
1846 Py_INCREF(w);
1847 PUSH(w);
1848 }
1849 } else if (unpack_iterable(v, oparg,
1850 stack_pointer + oparg)) {
1851 stack_pointer += oparg;
1852 } else {
1853 /* unpack_iterable() raised an exception */
1854 why = WHY_EXCEPTION;
1855 }
1856 Py_DECREF(v);
1857 break;
1858
1859 case STORE_ATTR:
1860 w = GETITEM(names, oparg);
1861 v = TOP();
1862 u = SECOND();
1863 STACKADJ(-2);
1864 err = PyObject_SetAttr(v, w, u); /* v.w = u */
1865 Py_DECREF(v);
1866 Py_DECREF(u);
1867 if (err == 0) continue;
1868 break;
1869
1870 case DELETE_ATTR:
1871 w = GETITEM(names, oparg);
1872 v = POP();
1873 err = PyObject_SetAttr(v, w, (PyObject *)NULL);
1874 /* del v.w */
1875 Py_DECREF(v);
1876 break;
1877
1878 case STORE_GLOBAL:
1879 w = GETITEM(names, oparg);
1880 v = POP();
1881 err = PyDict_SetItem(f->f_globals, w, v);
1882 Py_DECREF(v);
1883 if (err == 0) continue;
1884 break;
1885
1886 case DELETE_GLOBAL:
1887 w = GETITEM(names, oparg);
1888 if ((err = PyDict_DelItem(f->f_globals, w)) != 0)
1889 format_exc_check_arg(
1890 PyExc_NameError, GLOBAL_NAME_ERROR_MSG, w);
1891 break;
1892
1893 case LOAD_NAME:
1894 w = GETITEM(names, oparg);
1895 if ((v = f->f_locals) == NULL) {
1896 PyErr_Format(PyExc_SystemError,
1897 "no locals when loading %s",
1898 PyObject_REPR(w));
1899 why = WHY_EXCEPTION;
1900 break;
1901 }
1902 if (PyDict_CheckExact(v)) {
1903 x = PyDict_GetItem(v, w);
1904 Py_XINCREF(x);
1905 }
1906 else {
1907 x = PyObject_GetItem(v, w);
1908 if (x == NULL && PyErr_Occurred()) {
1909 if (!PyErr_ExceptionMatches(
1910 PyExc_KeyError))
1911 break;
1912 PyErr_Clear();
1913 }
1914 }
1915 if (x == NULL) {
1916 x = PyDict_GetItem(f->f_globals, w);
1917 if (x == NULL) {
1918 x = PyDict_GetItem(f->f_builtins, w);
1919 if (x == NULL) {
1920 format_exc_check_arg(
1921 PyExc_NameError,
1922 NAME_ERROR_MSG, w);
1923 break;
1924 }
1925 }
1926 Py_INCREF(x);
1927 }
1928 PUSH(x);
1929 continue;
1930
1931 case LOAD_GLOBAL:
1932 w = GETITEM(names, oparg);
1933 if (PyString_CheckExact(w)) {
1934 /* Inline the PyDict_GetItem() calls.
1935 WARNING: this is an extreme speed hack.
1936 Do not try this at home. */
1937 long hash = ((PyStringObject *)w)->ob_shash;
1938 if (hash != -1) {
1939 PyDictObject *d;
1940 PyDictEntry *e;
1941 d = (PyDictObject *)(f->f_globals);
1942 e = d->ma_lookup(d, w, hash);
1943 if (e == NULL) {
1944 x = NULL;
1945 break;
1946 }
1947 x = e->me_value;
1948 if (x != NULL) {
1949 Py_INCREF(x);
1950 PUSH(x);
1951 continue;
1952 }
1953 d = (PyDictObject *)(f->f_builtins);
1954 e = d->ma_lookup(d, w, hash);
1955 if (e == NULL) {
1956 x = NULL;
1957 break;
1958 }
1959 x = e->me_value;
1960 if (x != NULL) {
1961 Py_INCREF(x);
1962 PUSH(x);
1963 continue;
1964 }
1965 goto load_global_error;
1966 }
1967 }
1968 /* This is the un-inlined version of the code above */
1969 x = PyDict_GetItem(f->f_globals, w);
1970 if (x == NULL) {
1971 x = PyDict_GetItem(f->f_builtins, w);
1972 if (x == NULL) {
1973 load_global_error:
1974 format_exc_check_arg(
1975 PyExc_NameError,
1976 GLOBAL_NAME_ERROR_MSG, w);
1977 break;
1978 }
1979 }
1980 Py_INCREF(x);
1981 PUSH(x);
1982 continue;
1983
1984 case DELETE_FAST:
1985 x = GETLOCAL(oparg);
1986 if (x != NULL) {
1987 SETLOCAL(oparg, NULL);
1988 continue;
1989 }
1990 format_exc_check_arg(
1991 PyExc_UnboundLocalError,
1992 UNBOUNDLOCAL_ERROR_MSG,
1993 PyTuple_GetItem(co->co_varnames, oparg)
1994 );
1995 break;
1996
1997 case LOAD_CLOSURE:
1998 x = freevars[oparg];
1999 Py_INCREF(x);
2000 PUSH(x);
2001 if (x != NULL) continue;
2002 break;
2003
2004 case LOAD_DEREF:
2005 x = freevars[oparg];
2006 w = PyCell_Get(x);
2007 if (w != NULL) {
2008 PUSH(w);
2009 continue;
2010 }
2011 err = -1;
2012 /* Don't stomp existing exception */
2013 if (PyErr_Occurred())
2014 break;
2015 if (oparg < PyTuple_GET_SIZE(co->co_cellvars)) {
2016 v = PyTuple_GET_ITEM(co->co_cellvars,
2017 oparg);
2018 format_exc_check_arg(
2019 PyExc_UnboundLocalError,
2020 UNBOUNDLOCAL_ERROR_MSG,
2021 v);
2022 } else {
2023 v = PyTuple_GET_ITEM(co->co_freevars, oparg -
2024 PyTuple_GET_SIZE(co->co_cellvars));
2025 format_exc_check_arg(PyExc_NameError,
2026 UNBOUNDFREE_ERROR_MSG, v);
2027 }
2028 break;
2029
2030 case STORE_DEREF:
2031 w = POP();
2032 x = freevars[oparg];
2033 PyCell_Set(x, w);
2034 Py_DECREF(w);
2035 continue;
2036
2037 case BUILD_TUPLE:
2038 x = PyTuple_New(oparg);
2039 if (x != NULL) {
2040 for (; --oparg >= 0;) {
2041 w = POP();
2042 PyTuple_SET_ITEM(x, oparg, w);
2043 }
2044 PUSH(x);
2045 continue;
2046 }
2047 break;
2048
2049 case BUILD_LIST:
2050 x = PyList_New(oparg);
2051 if (x != NULL) {
2052 for (; --oparg >= 0;) {
2053 w = POP();
2054 PyList_SET_ITEM(x, oparg, w);
2055 }
2056 PUSH(x);
2057 continue;
2058 }
2059 break;
2060
2061 case BUILD_MAP:
2062 x = _PyDict_NewPresized((Py_ssize_t)oparg);
2063 PUSH(x);
2064 if (x != NULL) continue;
2065 break;
2066
2067 case STORE_MAP:
2068 w = TOP(); /* key */
2069 u = SECOND(); /* value */
2070 v = THIRD(); /* dict */
2071 STACKADJ(-2);
2072 assert (PyDict_CheckExact(v));
2073 err = PyDict_SetItem(v, w, u); /* v[w] = u */
2074 Py_DECREF(u);
2075 Py_DECREF(w);
2076 if (err == 0) continue;
2077 break;
2078
2079 case LOAD_ATTR:
2080 w = GETITEM(names, oparg);
2081 v = TOP();
2082 x = PyObject_GetAttr(v, w);
2083 Py_DECREF(v);
2084 SET_TOP(x);
2085 if (x != NULL) continue;
2086 break;
2087
2088 case COMPARE_OP:
2089 w = POP();
2090 v = TOP();
2091 if (PyInt_CheckExact(w) && PyInt_CheckExact(v)) {
2092 /* INLINE: cmp(int, int) */
2093 register long a, b;
2094 register int res;
2095 a = PyInt_AS_LONG(v);
2096 b = PyInt_AS_LONG(w);
2097 switch (oparg) {
2098 case PyCmp_LT: res = a < b; break;
2099 case PyCmp_LE: res = a <= b; break;
2100 case PyCmp_EQ: res = a == b; break;
2101 case PyCmp_NE: res = a != b; break;
2102 case PyCmp_GT: res = a > b; break;
2103 case PyCmp_GE: res = a >= b; break;
2104 case PyCmp_IS: res = v == w; break;
2105 case PyCmp_IS_NOT: res = v != w; break;
2106 default: goto slow_compare;
2107 }
2108 x = res ? Py_True : Py_False;
2109 Py_INCREF(x);
2110 }
2111 else {
2112 slow_compare:
2113 x = cmp_outcome(oparg, v, w);
2114 }
2115 Py_DECREF(v);
2116 Py_DECREF(w);
2117 SET_TOP(x);
2118 if (x == NULL) break;
2119 PREDICT(JUMP_IF_FALSE);
2120 PREDICT(JUMP_IF_TRUE);
2121 continue;
2122
2123 case IMPORT_NAME:
2124 w = GETITEM(names, oparg);
2125 x = PyDict_GetItemString(f->f_builtins, "__import__");
2126 if (x == NULL) {
2127 PyErr_SetString(PyExc_ImportError,
2128 "__import__ not found");
2129 break;
2130 }
2131 Py_INCREF(x);
2132 v = POP();
2133 u = TOP();
2134 if (PyInt_AsLong(u) != -1 || PyErr_Occurred())
2135 w = PyTuple_Pack(5,
2136 w,
2137 f->f_globals,
2138 f->f_locals == NULL ?
2139 Py_None : f->f_locals,
2140 v,
2141 u);
2142 else
2143 w = PyTuple_Pack(4,
2144 w,
2145 f->f_globals,
2146 f->f_locals == NULL ?
2147 Py_None : f->f_locals,
2148 v);
2149 Py_DECREF(v);
2150 Py_DECREF(u);
2151 if (w == NULL) {
2152 u = POP();
2153 Py_DECREF(x);
2154 x = NULL;
2155 break;
2156 }
2157 READ_TIMESTAMP(intr0);
2158 v = x;
2159 x = PyEval_CallObject(v, w);
2160 Py_DECREF(v);
2161 READ_TIMESTAMP(intr1);
2162 Py_DECREF(w);
2163 SET_TOP(x);
2164 if (x != NULL) continue;
2165 break;
2166
2167 case IMPORT_STAR:
2168 v = POP();
2169 PyFrame_FastToLocals(f);
2170 if ((x = f->f_locals) == NULL) {
2171 PyErr_SetString(PyExc_SystemError,
2172 "no locals found during 'import *'");
2173 break;
2174 }
2175 READ_TIMESTAMP(intr0);
2176 err = import_all_from(x, v);
2177 READ_TIMESTAMP(intr1);
2178 PyFrame_LocalsToFast(f, 0);
2179 Py_DECREF(v);
2180 if (err == 0) continue;
2181 break;
2182
2183 case IMPORT_FROM:
2184 w = GETITEM(names, oparg);
2185 v = TOP();
2186 READ_TIMESTAMP(intr0);
2187 x = import_from(v, w);
2188 READ_TIMESTAMP(intr1);
2189 PUSH(x);
2190 if (x != NULL) continue;
2191 break;
2192
2193 case JUMP_FORWARD:
2194 JUMPBY(oparg);
2195 goto fast_next_opcode;
2196
2197 PREDICTED_WITH_ARG(JUMP_IF_FALSE);
2198 case JUMP_IF_FALSE:
2199 w = TOP();
2200 if (w == Py_True) {
2201 PREDICT(POP_TOP);
2202 goto fast_next_opcode;
2203 }
2204 if (w == Py_False) {
2205 JUMPBY(oparg);
2206 goto fast_next_opcode;
2207 }
2208 err = PyObject_IsTrue(w);
2209 if (err > 0)
2210 err = 0;
2211 else if (err == 0)
2212 JUMPBY(oparg);
2213 else
2214 break;
2215 continue;
2216
2217 PREDICTED_WITH_ARG(JUMP_IF_TRUE);
2218 case JUMP_IF_TRUE:
2219 w = TOP();
2220 if (w == Py_False) {
2221 PREDICT(POP_TOP);
2222 goto fast_next_opcode;
2223 }
2224 if (w == Py_True) {
2225 JUMPBY(oparg);
2226 goto fast_next_opcode;
2227 }
2228 err = PyObject_IsTrue(w);
2229 if (err > 0) {
2230 err = 0;
2231 JUMPBY(oparg);
2232 }
2233 else if (err == 0)
2234 ;
2235 else
2236 break;
2237 continue;
2238
2239 PREDICTED_WITH_ARG(JUMP_ABSOLUTE);
2240 case JUMP_ABSOLUTE:
2241 JUMPTO(oparg);
2242#if FAST_LOOPS
2243 /* Enabling this path speeds-up all while and for-loops by bypassing
2244 the per-loop checks for signals. By default, this should be turned-off
2245 because it prevents detection of a control-break in tight loops like
2246 "while 1: pass". Compile with this option turned-on when you need
2247 the speed-up and do not need break checking inside tight loops (ones
2248 that contain only instructions ending with goto fast_next_opcode).
2249 */
2250 goto fast_next_opcode;
2251#else
2252 continue;
2253#endif
2254
2255 case GET_ITER:
2256 /* before: [obj]; after [getiter(obj)] */
2257 v = TOP();
2258 x = PyObject_GetIter(v);
2259 Py_DECREF(v);
2260 if (x != NULL) {
2261 SET_TOP(x);
2262 PREDICT(FOR_ITER);
2263 continue;
2264 }
2265 STACKADJ(-1);
2266 break;
2267
2268 PREDICTED_WITH_ARG(FOR_ITER);
2269 case FOR_ITER:
2270 /* before: [iter]; after: [iter, iter()] *or* [] */
2271 v = TOP();
2272 x = (*v->ob_type->tp_iternext)(v);
2273 if (x != NULL) {
2274 PUSH(x);
2275 PREDICT(STORE_FAST);
2276 PREDICT(UNPACK_SEQUENCE);
2277 continue;
2278 }
2279 if (PyErr_Occurred()) {
2280 if (!PyErr_ExceptionMatches(
2281 PyExc_StopIteration))
2282 break;
2283 PyErr_Clear();
2284 }
2285 /* iterator ended normally */
2286 x = v = POP();
2287 Py_DECREF(v);
2288 JUMPBY(oparg);
2289 continue;
2290
2291 case BREAK_LOOP:
2292 why = WHY_BREAK;
2293 goto fast_block_end;
2294
2295 case CONTINUE_LOOP:
2296 retval = PyInt_FromLong(oparg);
2297 if (!retval) {
2298 x = NULL;
2299 break;
2300 }
2301 why = WHY_CONTINUE;
2302 goto fast_block_end;
2303
2304 case SETUP_LOOP:
2305 case SETUP_EXCEPT:
2306 case SETUP_FINALLY:
2307 /* NOTE: If you add any new block-setup opcodes that
2308 are not try/except/finally handlers, you may need
2309 to update the PyGen_NeedsFinalizing() function.
2310 */
2311
2312 PyFrame_BlockSetup(f, opcode, INSTR_OFFSET() + oparg,
2313 STACK_LEVEL());
2314 continue;
2315
2316 case WITH_CLEANUP:
2317 {
2318 /* At the top of the stack are 1-3 values indicating
2319 how/why we entered the finally clause:
2320 - TOP = None
2321 - (TOP, SECOND) = (WHY_{RETURN,CONTINUE}), retval
2322 - TOP = WHY_*; no retval below it
2323 - (TOP, SECOND, THIRD) = exc_info()
2324 Below them is EXIT, the context.__exit__ bound method.
2325 In the last case, we must call
2326 EXIT(TOP, SECOND, THIRD)
2327 otherwise we must call
2328 EXIT(None, None, None)
2329
2330 In all cases, we remove EXIT from the stack, leaving
2331 the rest in the same order.
2332
2333 In addition, if the stack represents an exception,
2334 *and* the function call returns a 'true' value, we
2335 "zap" this information, to prevent END_FINALLY from
2336 re-raising the exception. (But non-local gotos
2337 should still be resumed.)
2338 */
2339
2340 PyObject *exit_func;
2341
2342 u = POP();
2343 if (u == Py_None) {
2344 exit_func = TOP();
2345 SET_TOP(u);
2346 v = w = Py_None;
2347 }
2348 else if (PyInt_Check(u)) {
2349 switch(PyInt_AS_LONG(u)) {
2350 case WHY_RETURN:
2351 case WHY_CONTINUE:
2352 /* Retval in TOP. */
2353 exit_func = SECOND();
2354 SET_SECOND(TOP());
2355 SET_TOP(u);
2356 break;
2357 default:
2358 exit_func = TOP();
2359 SET_TOP(u);
2360 break;
2361 }
2362 u = v = w = Py_None;
2363 }
2364 else {
2365 v = TOP();
2366 w = SECOND();
2367 exit_func = THIRD();
2368 SET_TOP(u);
2369 SET_SECOND(v);
2370 SET_THIRD(w);
2371 }
2372 /* XXX Not the fastest way to call it... */
2373 x = PyObject_CallFunctionObjArgs(exit_func, u, v, w,
2374 NULL);
2375 Py_DECREF(exit_func);
2376 if (x == NULL)
2377 break; /* Go to error exit */
2378
2379 if (u != Py_None)
2380 err = PyObject_IsTrue(x);
2381 else
2382 err = 0;
2383 Py_DECREF(x);
2384
2385 if (err < 0)
2386 break; /* Go to error exit */
2387 else if (err > 0) {
2388 err = 0;
2389 /* There was an exception and a true return */
2390 STACKADJ(-2);
2391 Py_INCREF(Py_None);
2392 SET_TOP(Py_None);
2393 Py_DECREF(u);
2394 Py_DECREF(v);
2395 Py_DECREF(w);
2396 } else {
2397 /* The stack was rearranged to remove EXIT
2398 above. Let END_FINALLY do its thing */
2399 }
2400 PREDICT(END_FINALLY);
2401 break;
2402 }
2403
2404 case CALL_FUNCTION:
2405 {
2406 PyObject **sp;
2407 PCALL(PCALL_ALL);
2408 sp = stack_pointer;
2409#ifdef WITH_TSC
2410 x = call_function(&sp, oparg, &intr0, &intr1);
2411#else
2412 x = call_function(&sp, oparg);
2413#endif
2414 stack_pointer = sp;
2415 PUSH(x);
2416 if (x != NULL)
2417 continue;
2418 break;
2419 }
2420
2421 case CALL_FUNCTION_VAR:
2422 case CALL_FUNCTION_KW:
2423 case CALL_FUNCTION_VAR_KW:
2424 {
2425 int na = oparg & 0xff;
2426 int nk = (oparg>>8) & 0xff;
2427 int flags = (opcode - CALL_FUNCTION) & 3;
2428 int n = na + 2 * nk;
2429 PyObject **pfunc, *func, **sp;
2430 PCALL(PCALL_ALL);
2431 if (flags & CALL_FLAG_VAR)
2432 n++;
2433 if (flags & CALL_FLAG_KW)
2434 n++;
2435 pfunc = stack_pointer - n - 1;
2436 func = *pfunc;
2437
2438 if (PyMethod_Check(func)
2439 && PyMethod_GET_SELF(func) != NULL) {
2440 PyObject *self = PyMethod_GET_SELF(func);
2441 Py_INCREF(self);
2442 func = PyMethod_GET_FUNCTION(func);
2443 Py_INCREF(func);
2444 Py_DECREF(*pfunc);
2445 *pfunc = self;
2446 na++;
2447 n++;
2448 } else
2449 Py_INCREF(func);
2450 sp = stack_pointer;
2451 READ_TIMESTAMP(intr0);
2452 x = ext_do_call(func, &sp, flags, na, nk);
2453 READ_TIMESTAMP(intr1);
2454 stack_pointer = sp;
2455 Py_DECREF(func);
2456
2457 while (stack_pointer > pfunc) {
2458 w = POP();
2459 Py_DECREF(w);
2460 }
2461 PUSH(x);
2462 if (x != NULL)
2463 continue;
2464 break;
2465 }
2466
2467 case MAKE_FUNCTION:
2468 v = POP(); /* code object */
2469 x = PyFunction_New(v, f->f_globals);
2470 Py_DECREF(v);
2471 /* XXX Maybe this should be a separate opcode? */
2472 if (x != NULL && oparg > 0) {
2473 v = PyTuple_New(oparg);
2474 if (v == NULL) {
2475 Py_DECREF(x);
2476 x = NULL;
2477 break;
2478 }
2479 while (--oparg >= 0) {
2480 w = POP();
2481 PyTuple_SET_ITEM(v, oparg, w);
2482 }
2483 err = PyFunction_SetDefaults(x, v);
2484 Py_DECREF(v);
2485 }
2486 PUSH(x);
2487 break;
2488
2489 case MAKE_CLOSURE:
2490 {
2491 v = POP(); /* code object */
2492 x = PyFunction_New(v, f->f_globals);
2493 Py_DECREF(v);
2494 if (x != NULL) {
2495 v = POP();
2496 if (PyFunction_SetClosure(x, v) != 0) {
2497 /* Can't happen unless bytecode is corrupt. */
2498 why = WHY_EXCEPTION;
2499 }
2500 Py_DECREF(v);
2501 }
2502 if (x != NULL && oparg > 0) {
2503 v = PyTuple_New(oparg);
2504 if (v == NULL) {
2505 Py_DECREF(x);
2506 x = NULL;
2507 break;
2508 }
2509 while (--oparg >= 0) {
2510 w = POP();
2511 PyTuple_SET_ITEM(v, oparg, w);
2512 }
2513 if (PyFunction_SetDefaults(x, v) != 0) {
2514 /* Can't happen unless
2515 PyFunction_SetDefaults changes. */
2516 why = WHY_EXCEPTION;
2517 }
2518 Py_DECREF(v);
2519 }
2520 PUSH(x);
2521 break;
2522 }
2523
2524 case BUILD_SLICE:
2525 if (oparg == 3)
2526 w = POP();
2527 else
2528 w = NULL;
2529 v = POP();
2530 u = TOP();
2531 x = PySlice_New(u, v, w);
2532 Py_DECREF(u);
2533 Py_DECREF(v);
2534 Py_XDECREF(w);
2535 SET_TOP(x);
2536 if (x != NULL) continue;
2537 break;
2538
2539 case EXTENDED_ARG:
2540 opcode = NEXTOP();
2541 oparg = oparg<<16 | NEXTARG();
2542 goto dispatch_opcode;
2543
2544 default:
2545 fprintf(stderr,
2546 "XXX lineno: %d, opcode: %d\n",
2547 PyCode_Addr2Line(f->f_code, f->f_lasti),
2548 opcode);
2549 PyErr_SetString(PyExc_SystemError, "unknown opcode");
2550 why = WHY_EXCEPTION;
2551 break;
2552
2553#ifdef CASE_TOO_BIG
2554 }
2555#endif
2556
2557 } /* switch */
2558
2559 on_error:
2560
2561 READ_TIMESTAMP(inst1);
2562
2563 /* Quickly continue if no error occurred */
2564
2565 if (why == WHY_NOT) {
2566 if (err == 0 && x != NULL) {
2567#ifdef CHECKEXC
2568 /* This check is expensive! */
2569 if (PyErr_Occurred())
2570 fprintf(stderr,
2571 "XXX undetected error\n");
2572 else {
2573#endif
2574 READ_TIMESTAMP(loop1);
2575 continue; /* Normal, fast path */
2576#ifdef CHECKEXC
2577 }
2578#endif
2579 }
2580 why = WHY_EXCEPTION;
2581 x = Py_None;
2582 err = 0;
2583 }
2584
2585 /* Double-check exception status */
2586
2587 if (why == WHY_EXCEPTION || why == WHY_RERAISE) {
2588 if (!PyErr_Occurred()) {
2589 PyErr_SetString(PyExc_SystemError,
2590 "error return without exception set");
2591 why = WHY_EXCEPTION;
2592 }
2593 }
2594#ifdef CHECKEXC
2595 else {
2596 /* This check is expensive! */
2597 if (PyErr_Occurred()) {
2598 char buf[128];
2599 sprintf(buf, "Stack unwind with exception "
2600 "set and why=%d", why);
2601 Py_FatalError(buf);
2602 }
2603 }
2604#endif
2605
2606 /* Log traceback info if this is a real exception */
2607
2608 if (why == WHY_EXCEPTION) {
2609 PyTraceBack_Here(f);
2610
2611 if (tstate->c_tracefunc != NULL)
2612 call_exc_trace(tstate->c_tracefunc,
2613 tstate->c_traceobj, f);
2614 }
2615
2616 /* For the rest, treat WHY_RERAISE as WHY_EXCEPTION */
2617
2618 if (why == WHY_RERAISE)
2619 why = WHY_EXCEPTION;
2620
2621 /* Unwind stacks if a (pseudo) exception occurred */
2622
2623fast_block_end:
2624 while (why != WHY_NOT && f->f_iblock > 0) {
2625 PyTryBlock *b = PyFrame_BlockPop(f);
2626
2627 assert(why != WHY_YIELD);
2628 if (b->b_type == SETUP_LOOP && why == WHY_CONTINUE) {
2629 /* For a continue inside a try block,
2630 don't pop the block for the loop. */
2631 PyFrame_BlockSetup(f, b->b_type, b->b_handler,
2632 b->b_level);
2633 why = WHY_NOT;
2634 JUMPTO(PyInt_AS_LONG(retval));
2635 Py_DECREF(retval);
2636 break;
2637 }
2638
2639 while (STACK_LEVEL() > b->b_level) {
2640 v = POP();
2641 Py_XDECREF(v);
2642 }
2643 if (b->b_type == SETUP_LOOP && why == WHY_BREAK) {
2644 why = WHY_NOT;
2645 JUMPTO(b->b_handler);
2646 break;
2647 }
2648 if (b->b_type == SETUP_FINALLY ||
2649 (b->b_type == SETUP_EXCEPT &&
2650 why == WHY_EXCEPTION)) {
2651 if (why == WHY_EXCEPTION) {
2652 PyObject *exc, *val, *tb;
2653 PyErr_Fetch(&exc, &val, &tb);
2654 if (val == NULL) {
2655 val = Py_None;
2656 Py_INCREF(val);
2657 }
2658 /* Make the raw exception data
2659 available to the handler,
2660 so a program can emulate the
2661 Python main loop. Don't do
2662 this for 'finally'. */
2663 if (b->b_type == SETUP_EXCEPT) {
2664 PyErr_NormalizeException(
2665 &exc, &val, &tb);
2666 set_exc_info(tstate,
2667 exc, val, tb);
2668 }
2669 if (tb == NULL) {
2670 Py_INCREF(Py_None);
2671 PUSH(Py_None);
2672 } else
2673 PUSH(tb);
2674 PUSH(val);
2675 PUSH(exc);
2676 }
2677 else {
2678 if (why & (WHY_RETURN | WHY_CONTINUE))
2679 PUSH(retval);
2680 v = PyInt_FromLong((long)why);
2681 PUSH(v);
2682 }
2683 why = WHY_NOT;
2684 JUMPTO(b->b_handler);
2685 break;
2686 }
2687 } /* unwind stack */
2688
2689 /* End the loop if we still have an error (or return) */
2690
2691 if (why != WHY_NOT)
2692 break;
2693 READ_TIMESTAMP(loop1);
2694
2695 } /* main loop */
2696
2697 assert(why != WHY_YIELD);
2698 /* Pop remaining stack entries. */
2699 while (!EMPTY()) {
2700 v = POP();
2701 Py_XDECREF(v);
2702 }
2703
2704 if (why != WHY_RETURN)
2705 retval = NULL;
2706
2707fast_yield:
2708 if (tstate->use_tracing) {
2709 if (tstate->c_tracefunc) {
2710 if (why == WHY_RETURN || why == WHY_YIELD) {
2711 if (call_trace(tstate->c_tracefunc,
2712 tstate->c_traceobj, f,
2713 PyTrace_RETURN, retval)) {
2714 Py_XDECREF(retval);
2715 retval = NULL;
2716 why = WHY_EXCEPTION;
2717 }
2718 }
2719 else if (why == WHY_EXCEPTION) {
2720 call_trace_protected(tstate->c_tracefunc,
2721 tstate->c_traceobj, f,
2722 PyTrace_RETURN, NULL);
2723 }
2724 }
2725 if (tstate->c_profilefunc) {
2726 if (why == WHY_EXCEPTION)
2727 call_trace_protected(tstate->c_profilefunc,
2728 tstate->c_profileobj, f,
2729 PyTrace_RETURN, NULL);
2730 else if (call_trace(tstate->c_profilefunc,
2731 tstate->c_profileobj, f,
2732 PyTrace_RETURN, retval)) {
2733 Py_XDECREF(retval);
2734 retval = NULL;
2735 why = WHY_EXCEPTION;
2736 }
2737 }
2738 }
2739
2740 if (tstate->frame->f_exc_type != NULL)
2741 reset_exc_info(tstate);
2742 else {
2743 assert(tstate->frame->f_exc_value == NULL);
2744 assert(tstate->frame->f_exc_traceback == NULL);
2745 }
2746
2747 /* pop frame */
2748exit_eval_frame:
2749 Py_LeaveRecursiveCall();
2750 tstate->frame = f->f_back;
2751
2752 return retval;
2753}
2754
2755/* This is gonna seem *real weird*, but if you put some other code between
2756 PyEval_EvalFrame() and PyEval_EvalCodeEx() you will need to adjust
2757 the test in the if statements in Misc/gdbinit (pystack and pystackv). */
2758
2759PyObject *
2760PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals,
2761 PyObject **args, int argcount, PyObject **kws, int kwcount,
2762 PyObject **defs, int defcount, PyObject *closure)
2763{
2764 register PyFrameObject *f;
2765 register PyObject *retval = NULL;
2766 register PyObject **fastlocals, **freevars;
2767 PyThreadState *tstate = PyThreadState_GET();
2768 PyObject *x, *u;
2769
2770 if (globals == NULL) {
2771 PyErr_SetString(PyExc_SystemError,
2772 "PyEval_EvalCodeEx: NULL globals");
2773 return NULL;
2774 }
2775
2776 assert(tstate != NULL);
2777 assert(globals != NULL);
2778 f = PyFrame_New(tstate, co, globals, locals);
2779 if (f == NULL)
2780 return NULL;
2781
2782 fastlocals = f->f_localsplus;
2783 freevars = f->f_localsplus + co->co_nlocals;
2784
2785 if (co->co_argcount > 0 ||
2786 co->co_flags & (CO_VARARGS | CO_VARKEYWORDS)) {
2787 int i;
2788 int n = argcount;
2789 PyObject *kwdict = NULL;
2790 if (co->co_flags & CO_VARKEYWORDS) {
2791 kwdict = PyDict_New();
2792 if (kwdict == NULL)
2793 goto fail;
2794 i = co->co_argcount;
2795 if (co->co_flags & CO_VARARGS)
2796 i++;
2797 SETLOCAL(i, kwdict);
2798 }
2799 if (argcount > co->co_argcount) {
2800 if (!(co->co_flags & CO_VARARGS)) {
2801 PyErr_Format(PyExc_TypeError,
2802 "%.200s() takes %s %d "
2803 "%sargument%s (%d given)",
2804 PyString_AsString(co->co_name),
2805 defcount ? "at most" : "exactly",
2806 co->co_argcount,
2807 kwcount ? "non-keyword " : "",
2808 co->co_argcount == 1 ? "" : "s",
2809 argcount);
2810 goto fail;
2811 }
2812 n = co->co_argcount;
2813 }
2814 for (i = 0; i < n; i++) {
2815 x = args[i];
2816 Py_INCREF(x);
2817 SETLOCAL(i, x);
2818 }
2819 if (co->co_flags & CO_VARARGS) {
2820 u = PyTuple_New(argcount - n);
2821 if (u == NULL)
2822 goto fail;
2823 SETLOCAL(co->co_argcount, u);
2824 for (i = n; i < argcount; i++) {
2825 x = args[i];
2826 Py_INCREF(x);
2827 PyTuple_SET_ITEM(u, i-n, x);
2828 }
2829 }
2830 for (i = 0; i < kwcount; i++) {
2831 PyObject **co_varnames;
2832 PyObject *keyword = kws[2*i];
2833 PyObject *value = kws[2*i + 1];
2834 int j;
2835 if (keyword == NULL || !(PyString_Check(keyword) ||
2836 PyUnicode_Check(keyword))) {
2837 PyErr_Format(PyExc_TypeError,
2838 "%.200s() keywords must be strings",
2839 PyString_AsString(co->co_name));
2840 goto fail;
2841 }
2842 /* Speed hack: do raw pointer compares. As names are
2843 normally interned this should almost always hit. */
2844 co_varnames = PySequence_Fast_ITEMS(co->co_varnames);
2845 for (j = 0; j < co->co_argcount; j++) {
2846 PyObject *nm = co_varnames[j];
2847 if (nm == keyword)
2848 goto kw_found;
2849 }
2850 /* Slow fallback, just in case */
2851 for (j = 0; j < co->co_argcount; j++) {
2852 PyObject *nm = co_varnames[j];
2853 int cmp = PyObject_RichCompareBool(
2854 keyword, nm, Py_EQ);
2855 if (cmp > 0)
2856 goto kw_found;
2857 else if (cmp < 0)
2858 goto fail;
2859 }
2860 /* Check errors from Compare */
2861 if (PyErr_Occurred())
2862 goto fail;
2863 if (j >= co->co_argcount) {
2864 if (kwdict == NULL) {
2865 PyObject *kwd_str = kwd_as_string(keyword);
2866 if (kwd_str) {
2867 PyErr_Format(PyExc_TypeError,
2868 "%.200s() got an unexpected "
2869 "keyword argument '%.400s'",
2870 PyString_AsString(co->co_name),
2871 PyString_AsString(kwd_str));
2872 Py_DECREF(kwd_str);
2873 }
2874 goto fail;
2875 }
2876 PyDict_SetItem(kwdict, keyword, value);
2877 continue;
2878 }
2879kw_found:
2880 if (GETLOCAL(j) != NULL) {
2881 PyObject *kwd_str = kwd_as_string(keyword);
2882 if (kwd_str) {
2883 PyErr_Format(PyExc_TypeError,
2884 "%.200s() got multiple "
2885 "values for keyword "
2886 "argument '%.400s'",
2887 PyString_AsString(co->co_name),
2888 PyString_AsString(kwd_str));
2889 Py_DECREF(kwd_str);
2890 }
2891 goto fail;
2892 }
2893 Py_INCREF(value);
2894 SETLOCAL(j, value);
2895 }
2896 if (argcount < co->co_argcount) {
2897 int m = co->co_argcount - defcount;
2898 for (i = argcount; i < m; i++) {
2899 if (GETLOCAL(i) == NULL) {
2900 PyErr_Format(PyExc_TypeError,
2901 "%.200s() takes %s %d "
2902 "%sargument%s (%d given)",
2903 PyString_AsString(co->co_name),
2904 ((co->co_flags & CO_VARARGS) ||
2905 defcount) ? "at least"
2906 : "exactly",
2907 m, kwcount ? "non-keyword " : "",
2908 m == 1 ? "" : "s", i);
2909 goto fail;
2910 }
2911 }
2912 if (n > m)
2913 i = n - m;
2914 else
2915 i = 0;
2916 for (; i < defcount; i++) {
2917 if (GETLOCAL(m+i) == NULL) {
2918 PyObject *def = defs[i];
2919 Py_INCREF(def);
2920 SETLOCAL(m+i, def);
2921 }
2922 }
2923 }
2924 }
2925 else {
2926 if (argcount > 0 || kwcount > 0) {
2927 PyErr_Format(PyExc_TypeError,
2928 "%.200s() takes no arguments (%d given)",
2929 PyString_AsString(co->co_name),
2930 argcount + kwcount);
2931 goto fail;
2932 }
2933 }
2934 /* Allocate and initialize storage for cell vars, and copy free
2935 vars into frame. This isn't too efficient right now. */
2936 if (PyTuple_GET_SIZE(co->co_cellvars)) {
2937 int i, j, nargs, found;
2938 char *cellname, *argname;
2939 PyObject *c;
2940
2941 nargs = co->co_argcount;
2942 if (co->co_flags & CO_VARARGS)
2943 nargs++;
2944 if (co->co_flags & CO_VARKEYWORDS)
2945 nargs++;
2946
2947 /* Initialize each cell var, taking into account
2948 cell vars that are initialized from arguments.
2949
2950 Should arrange for the compiler to put cellvars
2951 that are arguments at the beginning of the cellvars
2952 list so that we can march over it more efficiently?
2953 */
2954 for (i = 0; i < PyTuple_GET_SIZE(co->co_cellvars); ++i) {
2955 cellname = PyString_AS_STRING(
2956 PyTuple_GET_ITEM(co->co_cellvars, i));
2957 found = 0;
2958 for (j = 0; j < nargs; j++) {
2959 argname = PyString_AS_STRING(
2960 PyTuple_GET_ITEM(co->co_varnames, j));
2961 if (strcmp(cellname, argname) == 0) {
2962 c = PyCell_New(GETLOCAL(j));
2963 if (c == NULL)
2964 goto fail;
2965 GETLOCAL(co->co_nlocals + i) = c;
2966 found = 1;
2967 break;
2968 }
2969 }
2970 if (found == 0) {
2971 c = PyCell_New(NULL);
2972 if (c == NULL)
2973 goto fail;
2974 SETLOCAL(co->co_nlocals + i, c);
2975 }
2976 }
2977 }
2978 if (PyTuple_GET_SIZE(co->co_freevars)) {
2979 int i;
2980 for (i = 0; i < PyTuple_GET_SIZE(co->co_freevars); ++i) {
2981 PyObject *o = PyTuple_GET_ITEM(closure, i);
2982 Py_INCREF(o);
2983 freevars[PyTuple_GET_SIZE(co->co_cellvars) + i] = o;
2984 }
2985 }
2986
2987 if (co->co_flags & CO_GENERATOR) {
2988 /* Don't need to keep the reference to f_back, it will be set
2989 * when the generator is resumed. */
2990 Py_XDECREF(f->f_back);
2991 f->f_back = NULL;
2992
2993 PCALL(PCALL_GENERATOR);
2994
2995 /* Create a new generator that owns the ready to run frame
2996 * and return that as the value. */
2997 return PyGen_New(f);
2998 }
2999
3000 retval = PyEval_EvalFrameEx(f,0);
3001
3002fail: /* Jump here from prelude on failure */
3003
3004 /* decref'ing the frame can cause __del__ methods to get invoked,
3005 which can call back into Python. While we're done with the
3006 current Python frame (f), the associated C stack is still in use,
3007 so recursion_depth must be boosted for the duration.
3008 */
3009 assert(tstate != NULL);
3010 ++tstate->recursion_depth;
3011 Py_DECREF(f);
3012 --tstate->recursion_depth;
3013 return retval;
3014}
3015
3016
3017static PyObject *
3018kwd_as_string(PyObject *kwd) {
3019 if (PyString_Check(kwd)) {
3020 Py_INCREF(kwd);
3021 return kwd;
3022 }
3023 else
3024 return _PyUnicode_AsDefaultEncodedString(kwd, "replace");
3025}
3026
3027
3028/* Implementation notes for set_exc_info() and reset_exc_info():
3029
3030- Below, 'exc_ZZZ' stands for 'exc_type', 'exc_value' and
3031 'exc_traceback'. These always travel together.
3032
3033- tstate->curexc_ZZZ is the "hot" exception that is set by
3034 PyErr_SetString(), cleared by PyErr_Clear(), and so on.
3035
3036- Once an exception is caught by an except clause, it is transferred
3037 from tstate->curexc_ZZZ to tstate->exc_ZZZ, from which sys.exc_info()
3038 can pick it up. This is the primary task of set_exc_info().
3039 XXX That can't be right: set_exc_info() doesn't look at tstate->curexc_ZZZ.
3040
3041- Now let me explain the complicated dance with frame->f_exc_ZZZ.
3042
3043 Long ago, when none of this existed, there were just a few globals:
3044 one set corresponding to the "hot" exception, and one set
3045 corresponding to sys.exc_ZZZ. (Actually, the latter weren't C
3046 globals; they were simply stored as sys.exc_ZZZ. For backwards
3047 compatibility, they still are!) The problem was that in code like
3048 this:
3049
3050 try:
3051 "something that may fail"
3052 except "some exception":
3053 "do something else first"
3054 "print the exception from sys.exc_ZZZ."
3055
3056 if "do something else first" invoked something that raised and caught
3057 an exception, sys.exc_ZZZ were overwritten. That was a frequent
3058 cause of subtle bugs. I fixed this by changing the semantics as
3059 follows:
3060
3061 - Within one frame, sys.exc_ZZZ will hold the last exception caught
3062 *in that frame*.
3063
3064 - But initially, and as long as no exception is caught in a given
3065 frame, sys.exc_ZZZ will hold the last exception caught in the
3066 previous frame (or the frame before that, etc.).
3067
3068 The first bullet fixed the bug in the above example. The second
3069 bullet was for backwards compatibility: it was (and is) common to
3070 have a function that is called when an exception is caught, and to
3071 have that function access the caught exception via sys.exc_ZZZ.
3072 (Example: traceback.print_exc()).
3073
3074 At the same time I fixed the problem that sys.exc_ZZZ weren't
3075 thread-safe, by introducing sys.exc_info() which gets it from tstate;
3076 but that's really a separate improvement.
3077
3078 The reset_exc_info() function in ceval.c restores the tstate->exc_ZZZ
3079 variables to what they were before the current frame was called. The
3080 set_exc_info() function saves them on the frame so that
3081 reset_exc_info() can restore them. The invariant is that
3082 frame->f_exc_ZZZ is NULL iff the current frame never caught an
3083 exception (where "catching" an exception applies only to successful
3084 except clauses); and if the current frame ever caught an exception,
3085 frame->f_exc_ZZZ is the exception that was stored in tstate->exc_ZZZ
3086 at the start of the current frame.
3087
3088*/
3089
3090static void
3091set_exc_info(PyThreadState *tstate,
3092 PyObject *type, PyObject *value, PyObject *tb)
3093{
3094 PyFrameObject *frame = tstate->frame;
3095 PyObject *tmp_type, *tmp_value, *tmp_tb;
3096
3097 assert(type != NULL);
3098 assert(frame != NULL);
3099 if (frame->f_exc_type == NULL) {
3100 assert(frame->f_exc_value == NULL);
3101 assert(frame->f_exc_traceback == NULL);
3102 /* This frame didn't catch an exception before. */
3103 /* Save previous exception of this thread in this frame. */
3104 if (tstate->exc_type == NULL) {
3105 /* XXX Why is this set to Py_None? */
3106 Py_INCREF(Py_None);
3107 tstate->exc_type = Py_None;
3108 }
3109 Py_INCREF(tstate->exc_type);
3110 Py_XINCREF(tstate->exc_value);
3111 Py_XINCREF(tstate->exc_traceback);
3112 frame->f_exc_type = tstate->exc_type;
3113 frame->f_exc_value = tstate->exc_value;
3114 frame->f_exc_traceback = tstate->exc_traceback;
3115 }
3116 /* Set new exception for this thread. */
3117 tmp_type = tstate->exc_type;
3118 tmp_value = tstate->exc_value;
3119 tmp_tb = tstate->exc_traceback;
3120 Py_INCREF(type);
3121 Py_XINCREF(value);
3122 Py_XINCREF(tb);
3123 tstate->exc_type = type;
3124 tstate->exc_value = value;
3125 tstate->exc_traceback = tb;
3126 Py_XDECREF(tmp_type);
3127 Py_XDECREF(tmp_value);
3128 Py_XDECREF(tmp_tb);
3129 /* For b/w compatibility */
3130 PySys_SetObject("exc_type", type);
3131 PySys_SetObject("exc_value", value);
3132 PySys_SetObject("exc_traceback", tb);
3133}
3134
3135static void
3136reset_exc_info(PyThreadState *tstate)
3137{
3138 PyFrameObject *frame;
3139 PyObject *tmp_type, *tmp_value, *tmp_tb;
3140
3141 /* It's a precondition that the thread state's frame caught an
3142 * exception -- verify in a debug build.
3143 */
3144 assert(tstate != NULL);
3145 frame = tstate->frame;
3146 assert(frame != NULL);
3147 assert(frame->f_exc_type != NULL);
3148
3149 /* Copy the frame's exception info back to the thread state. */
3150 tmp_type = tstate->exc_type;
3151 tmp_value = tstate->exc_value;
3152 tmp_tb = tstate->exc_traceback;
3153 Py_INCREF(frame->f_exc_type);
3154 Py_XINCREF(frame->f_exc_value);
3155 Py_XINCREF(frame->f_exc_traceback);
3156 tstate->exc_type = frame->f_exc_type;
3157 tstate->exc_value = frame->f_exc_value;
3158 tstate->exc_traceback = frame->f_exc_traceback;
3159 Py_XDECREF(tmp_type);
3160 Py_XDECREF(tmp_value);
3161 Py_XDECREF(tmp_tb);
3162
3163 /* For b/w compatibility */
3164 PySys_SetObject("exc_type", frame->f_exc_type);
3165 PySys_SetObject("exc_value", frame->f_exc_value);
3166 PySys_SetObject("exc_traceback", frame->f_exc_traceback);
3167
3168 /* Clear the frame's exception info. */
3169 tmp_type = frame->f_exc_type;
3170 tmp_value = frame->f_exc_value;
3171 tmp_tb = frame->f_exc_traceback;
3172 frame->f_exc_type = NULL;
3173 frame->f_exc_value = NULL;
3174 frame->f_exc_traceback = NULL;
3175 Py_DECREF(tmp_type);
3176 Py_XDECREF(tmp_value);
3177 Py_XDECREF(tmp_tb);
3178}
3179
3180/* Logic for the raise statement (too complicated for inlining).
3181 This *consumes* a reference count to each of its arguments. */
3182static enum why_code
3183do_raise(PyObject *type, PyObject *value, PyObject *tb)
3184{
3185 if (type == NULL) {
3186 /* Reraise */
3187 PyThreadState *tstate = PyThreadState_GET();
3188 type = tstate->exc_type == NULL ? Py_None : tstate->exc_type;
3189 value = tstate->exc_value;
3190 tb = tstate->exc_traceback;
3191 Py_XINCREF(type);
3192 Py_XINCREF(value);
3193 Py_XINCREF(tb);
3194 }
3195
3196 /* We support the following forms of raise:
3197 raise <class>, <classinstance>
3198 raise <class>, <argument tuple>
3199 raise <class>, None
3200 raise <class>, <argument>
3201 raise <classinstance>, None
3202 raise <string>, <object>
3203 raise <string>, None
3204
3205 An omitted second argument is the same as None.
3206
3207 In addition, raise <tuple>, <anything> is the same as
3208 raising the tuple's first item (and it better have one!);
3209 this rule is applied recursively.
3210
3211 Finally, an optional third argument can be supplied, which
3212 gives the traceback to be substituted (useful when
3213 re-raising an exception after examining it). */
3214
3215 /* First, check the traceback argument, replacing None with
3216 NULL. */
3217 if (tb == Py_None) {
3218 Py_DECREF(tb);
3219 tb = NULL;
3220 }
3221 else if (tb != NULL && !PyTraceBack_Check(tb)) {
3222 PyErr_SetString(PyExc_TypeError,
3223 "raise: arg 3 must be a traceback or None");
3224 goto raise_error;
3225 }
3226
3227 /* Next, replace a missing value with None */
3228 if (value == NULL) {
3229 value = Py_None;
3230 Py_INCREF(value);
3231 }
3232
3233 /* Next, repeatedly, replace a tuple exception with its first item */
3234 while (PyTuple_Check(type) && PyTuple_Size(type) > 0) {
3235 PyObject *tmp = type;
3236 type = PyTuple_GET_ITEM(type, 0);
3237 Py_INCREF(type);
3238 Py_DECREF(tmp);
3239 }
3240
3241 if (PyExceptionClass_Check(type))
3242 PyErr_NormalizeException(&type, &value, &tb);
3243
3244 else if (PyExceptionInstance_Check(type)) {
3245 /* Raising an instance. The value should be a dummy. */
3246 if (value != Py_None) {
3247 PyErr_SetString(PyExc_TypeError,
3248 "instance exception may not have a separate value");
3249 goto raise_error;
3250 }
3251 else {
3252 /* Normalize to raise <class>, <instance> */
3253 Py_DECREF(value);
3254 value = type;
3255 type = PyExceptionInstance_Class(type);
3256 Py_INCREF(type);
3257 }
3258 }
3259 else {
3260 /* Not something you can raise. You get an exception
3261 anyway, just not what you specified :-) */
3262 PyErr_Format(PyExc_TypeError,
3263 "exceptions must be old-style classes or "
3264 "derived from BaseException, not %s",
3265 type->ob_type->tp_name);
3266 goto raise_error;
3267 }
3268
3269 assert(PyExceptionClass_Check(type));
3270 if (Py_Py3kWarningFlag && PyClass_Check(type)) {
3271 if (PyErr_WarnEx(PyExc_DeprecationWarning,
3272 "exceptions must derive from BaseException "
3273 "in 3.x", 1) < 0)
3274 goto raise_error;
3275 }
3276
3277 PyErr_Restore(type, value, tb);
3278 if (tb == NULL)
3279 return WHY_EXCEPTION;
3280 else
3281 return WHY_RERAISE;
3282 raise_error:
3283 Py_XDECREF(value);
3284 Py_XDECREF(type);
3285 Py_XDECREF(tb);
3286 return WHY_EXCEPTION;
3287}
3288
3289/* Iterate v argcnt times and store the results on the stack (via decreasing
3290 sp). Return 1 for success, 0 if error. */
3291
3292static int
3293unpack_iterable(PyObject *v, int argcnt, PyObject **sp)
3294{
3295 int i = 0;
3296 PyObject *it; /* iter(v) */
3297 PyObject *w;
3298
3299 assert(v != NULL);
3300
3301 it = PyObject_GetIter(v);
3302 if (it == NULL)
3303 goto Error;
3304
3305 for (; i < argcnt; i++) {
3306 w = PyIter_Next(it);
3307 if (w == NULL) {
3308 /* Iterator done, via error or exhaustion. */
3309 if (!PyErr_Occurred()) {
3310 PyErr_Format(PyExc_ValueError,
3311 "need more than %d value%s to unpack",
3312 i, i == 1 ? "" : "s");
3313 }
3314 goto Error;
3315 }
3316 *--sp = w;
3317 }
3318
3319 /* We better have exhausted the iterator now. */
3320 w = PyIter_Next(it);
3321 if (w == NULL) {
3322 if (PyErr_Occurred())
3323 goto Error;
3324 Py_DECREF(it);
3325 return 1;
3326 }
3327 Py_DECREF(w);
3328 PyErr_SetString(PyExc_ValueError, "too many values to unpack");
3329 /* fall through */
3330Error:
3331 for (; i > 0; i--, sp++)
3332 Py_DECREF(*sp);
3333 Py_XDECREF(it);
3334 return 0;
3335}
3336
3337
3338#ifdef LLTRACE
3339static int
3340prtrace(PyObject *v, char *str)
3341{
3342 printf("%s ", str);
3343 if (PyObject_Print(v, stdout, 0) != 0)
3344 PyErr_Clear(); /* Don't know what else to do */
3345 printf("\n");
3346 return 1;
3347}
3348#endif
3349
3350static void
3351call_exc_trace(Py_tracefunc func, PyObject *self, PyFrameObject *f)
3352{
3353 PyObject *type, *value, *traceback, *arg;
3354 int err;
3355 PyErr_Fetch(&type, &value, &traceback);
3356 if (value == NULL) {
3357 value = Py_None;
3358 Py_INCREF(value);
3359 }
3360 arg = PyTuple_Pack(3, type, value, traceback);
3361 if (arg == NULL) {
3362 PyErr_Restore(type, value, traceback);
3363 return;
3364 }
3365 err = call_trace(func, self, f, PyTrace_EXCEPTION, arg);
3366 Py_DECREF(arg);
3367 if (err == 0)
3368 PyErr_Restore(type, value, traceback);
3369 else {
3370 Py_XDECREF(type);
3371 Py_XDECREF(value);
3372 Py_XDECREF(traceback);
3373 }
3374}
3375
3376static int
3377call_trace_protected(Py_tracefunc func, PyObject *obj, PyFrameObject *frame,
3378 int what, PyObject *arg)
3379{
3380 PyObject *type, *value, *traceback;
3381 int err;
3382 PyErr_Fetch(&type, &value, &traceback);
3383 err = call_trace(func, obj, frame, what, arg);
3384 if (err == 0)
3385 {
3386 PyErr_Restore(type, value, traceback);
3387 return 0;
3388 }
3389 else {
3390 Py_XDECREF(type);
3391 Py_XDECREF(value);
3392 Py_XDECREF(traceback);
3393 return -1;
3394 }
3395}
3396
3397static int
3398call_trace(Py_tracefunc func, PyObject *obj, PyFrameObject *frame,
3399 int what, PyObject *arg)
3400{
3401 register PyThreadState *tstate = frame->f_tstate;
3402 int result;
3403 if (tstate->tracing)
3404 return 0;
3405 tstate->tracing++;
3406 tstate->use_tracing = 0;
3407 result = func(obj, frame, what, arg);
3408 tstate->use_tracing = ((tstate->c_tracefunc != NULL)
3409 || (tstate->c_profilefunc != NULL));
3410 tstate->tracing--;
3411 return result;
3412}
3413
3414PyObject *
3415_PyEval_CallTracing(PyObject *func, PyObject *args)
3416{
3417 PyFrameObject *frame = PyEval_GetFrame();
3418 PyThreadState *tstate = frame->f_tstate;
3419 int save_tracing = tstate->tracing;
3420 int save_use_tracing = tstate->use_tracing;
3421 PyObject *result;
3422
3423 tstate->tracing = 0;
3424 tstate->use_tracing = ((tstate->c_tracefunc != NULL)
3425 || (tstate->c_profilefunc != NULL));
3426 result = PyObject_Call(func, args, NULL);
3427 tstate->tracing = save_tracing;
3428 tstate->use_tracing = save_use_tracing;
3429 return result;
3430}
3431
3432static int
3433maybe_call_line_trace(Py_tracefunc func, PyObject *obj,
3434 PyFrameObject *frame, int *instr_lb, int *instr_ub,
3435 int *instr_prev)
3436{
3437 int result = 0;
3438
3439 /* If the last instruction executed isn't in the current
3440 instruction window, reset the window. If the last
3441 instruction happens to fall at the start of a line or if it
3442 represents a jump backwards, call the trace function.
3443 */
3444 if ((frame->f_lasti < *instr_lb || frame->f_lasti >= *instr_ub)) {
3445 int line;
3446 PyAddrPair bounds;
3447
3448 line = PyCode_CheckLineNumber(frame->f_code, frame->f_lasti,
3449 &bounds);
3450 if (line >= 0) {
3451 frame->f_lineno = line;
3452 result = call_trace(func, obj, frame,
3453 PyTrace_LINE, Py_None);
3454 }
3455 *instr_lb = bounds.ap_lower;
3456 *instr_ub = bounds.ap_upper;
3457 }
3458 else if (frame->f_lasti <= *instr_prev) {
3459 result = call_trace(func, obj, frame, PyTrace_LINE, Py_None);
3460 }
3461 *instr_prev = frame->f_lasti;
3462 return result;
3463}
3464
3465void
3466PyEval_SetProfile(Py_tracefunc func, PyObject *arg)
3467{
3468 PyThreadState *tstate = PyThreadState_GET();
3469 PyObject *temp = tstate->c_profileobj;
3470 Py_XINCREF(arg);
3471 tstate->c_profilefunc = NULL;
3472 tstate->c_profileobj = NULL;
3473 /* Must make sure that tracing is not ignored if 'temp' is freed */
3474 tstate->use_tracing = tstate->c_tracefunc != NULL;
3475 Py_XDECREF(temp);
3476 tstate->c_profilefunc = func;
3477 tstate->c_profileobj = arg;
3478 /* Flag that tracing or profiling is turned on */
3479 tstate->use_tracing = (func != NULL) || (tstate->c_tracefunc != NULL);
3480}
3481
3482void
3483PyEval_SetTrace(Py_tracefunc func, PyObject *arg)
3484{
3485 PyThreadState *tstate = PyThreadState_GET();
3486 PyObject *temp = tstate->c_traceobj;
3487 _Py_TracingPossible += (func != NULL) - (tstate->c_tracefunc != NULL);
3488 Py_XINCREF(arg);
3489 tstate->c_tracefunc = NULL;
3490 tstate->c_traceobj = NULL;
3491 /* Must make sure that profiling is not ignored if 'temp' is freed */
3492 tstate->use_tracing = tstate->c_profilefunc != NULL;
3493 Py_XDECREF(temp);
3494 tstate->c_tracefunc = func;
3495 tstate->c_traceobj = arg;
3496 /* Flag that tracing or profiling is turned on */
3497 tstate->use_tracing = ((func != NULL)
3498 || (tstate->c_profilefunc != NULL));
3499}
3500
3501PyObject *
3502PyEval_GetBuiltins(void)
3503{
3504 PyFrameObject *current_frame = PyEval_GetFrame();
3505 if (current_frame == NULL)
3506 return PyThreadState_GET()->interp->builtins;
3507 else
3508 return current_frame->f_builtins;
3509}
3510
3511PyObject *
3512PyEval_GetLocals(void)
3513{
3514 PyFrameObject *current_frame = PyEval_GetFrame();
3515 if (current_frame == NULL)
3516 return NULL;
3517 PyFrame_FastToLocals(current_frame);
3518 return current_frame->f_locals;
3519}
3520
3521PyObject *
3522PyEval_GetGlobals(void)
3523{
3524 PyFrameObject *current_frame = PyEval_GetFrame();
3525 if (current_frame == NULL)
3526 return NULL;
3527 else
3528 return current_frame->f_globals;
3529}
3530
3531PyFrameObject *
3532PyEval_GetFrame(void)
3533{
3534 PyThreadState *tstate = PyThreadState_GET();
3535 return _PyThreadState_GetFrame(tstate);
3536}
3537
3538int
3539PyEval_GetRestricted(void)
3540{
3541 PyFrameObject *current_frame = PyEval_GetFrame();
3542 return current_frame == NULL ? 0 : PyFrame_IsRestricted(current_frame);
3543}
3544
3545int
3546PyEval_MergeCompilerFlags(PyCompilerFlags *cf)
3547{
3548 PyFrameObject *current_frame = PyEval_GetFrame();
3549 int result = cf->cf_flags != 0;
3550
3551 if (current_frame != NULL) {
3552 const int codeflags = current_frame->f_code->co_flags;
3553 const int compilerflags = codeflags & PyCF_MASK;
3554 if (compilerflags) {
3555 result = 1;
3556 cf->cf_flags |= compilerflags;
3557 }
3558#if 0 /* future keyword */
3559 if (codeflags & CO_GENERATOR_ALLOWED) {
3560 result = 1;
3561 cf->cf_flags |= CO_GENERATOR_ALLOWED;
3562 }
3563#endif
3564 }
3565 return result;
3566}
3567
3568int
3569Py_FlushLine(void)
3570{
3571 PyObject *f = PySys_GetObject("stdout");
3572 if (f == NULL)
3573 return 0;
3574 if (!PyFile_SoftSpace(f, 0))
3575 return 0;
3576 return PyFile_WriteString("\n", f);
3577}
3578
3579
3580/* External interface to call any callable object.
3581 The arg must be a tuple or NULL. */
3582
3583#undef PyEval_CallObject
3584/* for backward compatibility: export this interface */
3585
3586PyObject *
3587PyEval_CallObject(PyObject *func, PyObject *arg)
3588{
3589 return PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL);
3590}
3591#define PyEval_CallObject(func,arg) \
3592 PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL)
3593
3594PyObject *
3595PyEval_CallObjectWithKeywords(PyObject *func, PyObject *arg, PyObject *kw)
3596{
3597 PyObject *result;
3598
3599 if (arg == NULL) {
3600 arg = PyTuple_New(0);
3601 if (arg == NULL)
3602 return NULL;
3603 }
3604 else if (!PyTuple_Check(arg)) {
3605 PyErr_SetString(PyExc_TypeError,
3606 "argument list must be a tuple");
3607 return NULL;
3608 }
3609 else
3610 Py_INCREF(arg);
3611
3612 if (kw != NULL && !PyDict_Check(kw)) {
3613 PyErr_SetString(PyExc_TypeError,
3614 "keyword list must be a dictionary");
3615 Py_DECREF(arg);
3616 return NULL;
3617 }
3618
3619 result = PyObject_Call(func, arg, kw);
3620 Py_DECREF(arg);
3621 return result;
3622}
3623
3624const char *
3625PyEval_GetFuncName(PyObject *func)
3626{
3627 if (PyMethod_Check(func))
3628 return PyEval_GetFuncName(PyMethod_GET_FUNCTION(func));
3629 else if (PyFunction_Check(func))
3630 return PyString_AsString(((PyFunctionObject*)func)->func_name);
3631 else if (PyCFunction_Check(func))
3632 return ((PyCFunctionObject*)func)->m_ml->ml_name;
3633 else if (PyClass_Check(func))
3634 return PyString_AsString(((PyClassObject*)func)->cl_name);
3635 else if (PyInstance_Check(func)) {
3636 return PyString_AsString(
3637 ((PyInstanceObject*)func)->in_class->cl_name);
3638 } else {
3639 return func->ob_type->tp_name;
3640 }
3641}
3642
3643const char *
3644PyEval_GetFuncDesc(PyObject *func)
3645{
3646 if (PyMethod_Check(func))
3647 return "()";
3648 else if (PyFunction_Check(func))
3649 return "()";
3650 else if (PyCFunction_Check(func))
3651 return "()";
3652 else if (PyClass_Check(func))
3653 return " constructor";
3654 else if (PyInstance_Check(func)) {
3655 return " instance";
3656 } else {
3657 return " object";
3658 }
3659}
3660
3661static void
3662err_args(PyObject *func, int flags, int nargs)
3663{
3664 if (flags & METH_NOARGS)
3665 PyErr_Format(PyExc_TypeError,
3666 "%.200s() takes no arguments (%d given)",
3667 ((PyCFunctionObject *)func)->m_ml->ml_name,
3668 nargs);
3669 else
3670 PyErr_Format(PyExc_TypeError,
3671 "%.200s() takes exactly one argument (%d given)",
3672 ((PyCFunctionObject *)func)->m_ml->ml_name,
3673 nargs);
3674}
3675
3676#define C_TRACE(x, call) \
3677if (tstate->use_tracing && tstate->c_profilefunc) { \
3678 if (call_trace(tstate->c_profilefunc, \
3679 tstate->c_profileobj, \
3680 tstate->frame, PyTrace_C_CALL, \
3681 func)) { \
3682 x = NULL; \
3683 } \
3684 else { \
3685 x = call; \
3686 if (tstate->c_profilefunc != NULL) { \
3687 if (x == NULL) { \
3688 call_trace_protected(tstate->c_profilefunc, \
3689 tstate->c_profileobj, \
3690 tstate->frame, PyTrace_C_EXCEPTION, \
3691 func); \
3692 /* XXX should pass (type, value, tb) */ \
3693 } else { \
3694 if (call_trace(tstate->c_profilefunc, \
3695 tstate->c_profileobj, \
3696 tstate->frame, PyTrace_C_RETURN, \
3697 func)) { \
3698 Py_DECREF(x); \
3699 x = NULL; \
3700 } \
3701 } \
3702 } \
3703 } \
3704} else { \
3705 x = call; \
3706 }
3707
3708static PyObject *
3709call_function(PyObject ***pp_stack, int oparg
3710#ifdef WITH_TSC
3711 , uint64* pintr0, uint64* pintr1
3712#endif
3713 )
3714{
3715 int na = oparg & 0xff;
3716 int nk = (oparg>>8) & 0xff;
3717 int n = na + 2 * nk;
3718 PyObject **pfunc = (*pp_stack) - n - 1;
3719 PyObject *func = *pfunc;
3720 PyObject *x, *w;
3721
3722 /* Always dispatch PyCFunction first, because these are
3723 presumed to be the most frequent callable object.
3724 */
3725 if (PyCFunction_Check(func) && nk == 0) {
3726 int flags = PyCFunction_GET_FLAGS(func);
3727 PyThreadState *tstate = PyThreadState_GET();
3728
3729 PCALL(PCALL_CFUNCTION);
3730 if (flags & (METH_NOARGS | METH_O)) {
3731 PyCFunction meth = PyCFunction_GET_FUNCTION(func);
3732 PyObject *self = PyCFunction_GET_SELF(func);
3733 if (flags & METH_NOARGS && na == 0) {
3734 C_TRACE(x, (*meth)(self,NULL));
3735 }
3736 else if (flags & METH_O && na == 1) {
3737 PyObject *arg = EXT_POP(*pp_stack);
3738 C_TRACE(x, (*meth)(self,arg));
3739 Py_DECREF(arg);
3740 }
3741 else {
3742 err_args(func, flags, na);
3743 x = NULL;
3744 }
3745 }
3746 else {
3747 PyObject *callargs;
3748 callargs = load_args(pp_stack, na);
3749 READ_TIMESTAMP(*pintr0);
3750 C_TRACE(x, PyCFunction_Call(func,callargs,NULL));
3751 READ_TIMESTAMP(*pintr1);
3752 Py_XDECREF(callargs);
3753 }
3754 } else {
3755 if (PyMethod_Check(func) && PyMethod_GET_SELF(func) != NULL) {
3756 /* optimize access to bound methods */
3757 PyObject *self = PyMethod_GET_SELF(func);
3758 PCALL(PCALL_METHOD);
3759 PCALL(PCALL_BOUND_METHOD);
3760 Py_INCREF(self);
3761 func = PyMethod_GET_FUNCTION(func);
3762 Py_INCREF(func);
3763 Py_DECREF(*pfunc);
3764 *pfunc = self;
3765 na++;
3766 n++;
3767 } else
3768 Py_INCREF(func);
3769 READ_TIMESTAMP(*pintr0);
3770 if (PyFunction_Check(func))
3771 x = fast_function(func, pp_stack, n, na, nk);
3772 else
3773 x = do_call(func, pp_stack, na, nk);
3774 READ_TIMESTAMP(*pintr1);
3775 Py_DECREF(func);
3776 }
3777
3778 /* Clear the stack of the function object. Also removes
3779 the arguments in case they weren't consumed already
3780 (fast_function() and err_args() leave them on the stack).
3781 */
3782 while ((*pp_stack) > pfunc) {
3783 w = EXT_POP(*pp_stack);
3784 Py_DECREF(w);
3785 PCALL(PCALL_POP);
3786 }
3787 return x;
3788}
3789
3790/* The fast_function() function optimize calls for which no argument
3791 tuple is necessary; the objects are passed directly from the stack.
3792 For the simplest case -- a function that takes only positional
3793 arguments and is called with only positional arguments -- it
3794 inlines the most primitive frame setup code from
3795 PyEval_EvalCodeEx(), which vastly reduces the checks that must be
3796 done before evaluating the frame.
3797*/
3798
3799static PyObject *
3800fast_function(PyObject *func, PyObject ***pp_stack, int n, int na, int nk)
3801{
3802 PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func);
3803 PyObject *globals = PyFunction_GET_GLOBALS(func);
3804 PyObject *argdefs = PyFunction_GET_DEFAULTS(func);
3805 PyObject **d = NULL;
3806 int nd = 0;
3807
3808 PCALL(PCALL_FUNCTION);
3809 PCALL(PCALL_FAST_FUNCTION);
3810 if (argdefs == NULL && co->co_argcount == n && nk==0 &&
3811 co->co_flags == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE)) {
3812 PyFrameObject *f;
3813 PyObject *retval = NULL;
3814 PyThreadState *tstate = PyThreadState_GET();
3815 PyObject **fastlocals, **stack;
3816 int i;
3817
3818 PCALL(PCALL_FASTER_FUNCTION);
3819 assert(globals != NULL);
3820 /* XXX Perhaps we should create a specialized
3821 PyFrame_New() that doesn't take locals, but does
3822 take builtins without sanity checking them.
3823 */
3824 assert(tstate != NULL);
3825 f = PyFrame_New(tstate, co, globals, NULL);
3826 if (f == NULL)
3827 return NULL;
3828
3829 fastlocals = f->f_localsplus;
3830 stack = (*pp_stack) - n;
3831
3832 for (i = 0; i < n; i++) {
3833 Py_INCREF(*stack);
3834 fastlocals[i] = *stack++;
3835 }
3836 retval = PyEval_EvalFrameEx(f,0);
3837 ++tstate->recursion_depth;
3838 Py_DECREF(f);
3839 --tstate->recursion_depth;
3840 return retval;
3841 }
3842 if (argdefs != NULL) {
3843 d = &PyTuple_GET_ITEM(argdefs, 0);
3844 nd = Py_SIZE(argdefs);
3845 }
3846 return PyEval_EvalCodeEx(co, globals,
3847 (PyObject *)NULL, (*pp_stack)-n, na,
3848 (*pp_stack)-2*nk, nk, d, nd,
3849 PyFunction_GET_CLOSURE(func));
3850}
3851
3852static PyObject *
3853update_keyword_args(PyObject *orig_kwdict, int nk, PyObject ***pp_stack,
3854 PyObject *func)
3855{
3856 PyObject *kwdict = NULL;
3857 if (orig_kwdict == NULL)
3858 kwdict = PyDict_New();
3859 else {
3860 kwdict = PyDict_Copy(orig_kwdict);
3861 Py_DECREF(orig_kwdict);
3862 }
3863 if (kwdict == NULL)
3864 return NULL;
3865 while (--nk >= 0) {
3866 int err;
3867 PyObject *value = EXT_POP(*pp_stack);
3868 PyObject *key = EXT_POP(*pp_stack);
3869 if (PyDict_GetItem(kwdict, key) != NULL) {
3870 PyErr_Format(PyExc_TypeError,
3871 "%.200s%s got multiple values "
3872 "for keyword argument '%.200s'",
3873 PyEval_GetFuncName(func),
3874 PyEval_GetFuncDesc(func),
3875 PyString_AsString(key));
3876 Py_DECREF(key);
3877 Py_DECREF(value);
3878 Py_DECREF(kwdict);
3879 return NULL;
3880 }
3881 err = PyDict_SetItem(kwdict, key, value);
3882 Py_DECREF(key);
3883 Py_DECREF(value);
3884 if (err) {
3885 Py_DECREF(kwdict);
3886 return NULL;
3887 }
3888 }
3889 return kwdict;
3890}
3891
3892static PyObject *
3893update_star_args(int nstack, int nstar, PyObject *stararg,
3894 PyObject ***pp_stack)
3895{
3896 PyObject *callargs, *w;
3897
3898 callargs = PyTuple_New(nstack + nstar);
3899 if (callargs == NULL) {
3900 return NULL;
3901 }
3902 if (nstar) {
3903 int i;
3904 for (i = 0; i < nstar; i++) {
3905 PyObject *a = PyTuple_GET_ITEM(stararg, i);
3906 Py_INCREF(a);
3907 PyTuple_SET_ITEM(callargs, nstack + i, a);
3908 }
3909 }
3910 while (--nstack >= 0) {
3911 w = EXT_POP(*pp_stack);
3912 PyTuple_SET_ITEM(callargs, nstack, w);
3913 }
3914 return callargs;
3915}
3916
3917static PyObject *
3918load_args(PyObject ***pp_stack, int na)
3919{
3920 PyObject *args = PyTuple_New(na);
3921 PyObject *w;
3922
3923 if (args == NULL)
3924 return NULL;
3925 while (--na >= 0) {
3926 w = EXT_POP(*pp_stack);
3927 PyTuple_SET_ITEM(args, na, w);
3928 }
3929 return args;
3930}
3931
3932static PyObject *
3933do_call(PyObject *func, PyObject ***pp_stack, int na, int nk)
3934{
3935 PyObject *callargs = NULL;
3936 PyObject *kwdict = NULL;
3937 PyObject *result = NULL;
3938
3939 if (nk > 0) {
3940 kwdict = update_keyword_args(NULL, nk, pp_stack, func);
3941 if (kwdict == NULL)
3942 goto call_fail;
3943 }
3944 callargs = load_args(pp_stack, na);
3945 if (callargs == NULL)
3946 goto call_fail;
3947#ifdef CALL_PROFILE
3948 /* At this point, we have to look at the type of func to
3949 update the call stats properly. Do it here so as to avoid
3950 exposing the call stats machinery outside ceval.c
3951 */
3952 if (PyFunction_Check(func))
3953 PCALL(PCALL_FUNCTION);
3954 else if (PyMethod_Check(func))
3955 PCALL(PCALL_METHOD);
3956 else if (PyType_Check(func))
3957 PCALL(PCALL_TYPE);
3958 else if (PyCFunction_Check(func))
3959 PCALL(PCALL_CFUNCTION);
3960 else
3961 PCALL(PCALL_OTHER);
3962#endif
3963 if (PyCFunction_Check(func)) {
3964 PyThreadState *tstate = PyThreadState_GET();
3965 C_TRACE(result, PyCFunction_Call(func, callargs, kwdict));
3966 }
3967 else
3968 result = PyObject_Call(func, callargs, kwdict);
3969 call_fail:
3970 Py_XDECREF(callargs);
3971 Py_XDECREF(kwdict);
3972 return result;
3973}
3974
3975static PyObject *
3976ext_do_call(PyObject *func, PyObject ***pp_stack, int flags, int na, int nk)
3977{
3978 int nstar = 0;
3979 PyObject *callargs = NULL;
3980 PyObject *stararg = NULL;
3981 PyObject *kwdict = NULL;
3982 PyObject *result = NULL;
3983
3984 if (flags & CALL_FLAG_KW) {
3985 kwdict = EXT_POP(*pp_stack);
3986 if (!PyDict_Check(kwdict)) {
3987 PyObject *d;
3988 d = PyDict_New();
3989 if (d == NULL)
3990 goto ext_call_fail;
3991 if (PyDict_Update(d, kwdict) != 0) {
3992 Py_DECREF(d);
3993 /* PyDict_Update raises attribute
3994 * error (percolated from an attempt
3995 * to get 'keys' attribute) instead of
3996 * a type error if its second argument
3997 * is not a mapping.
3998 */
3999 if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
4000 PyErr_Format(PyExc_TypeError,
4001 "%.200s%.200s argument after ** "
4002 "must be a mapping, not %.200s",
4003 PyEval_GetFuncName(func),
4004 PyEval_GetFuncDesc(func),
4005 kwdict->ob_type->tp_name);
4006 }
4007 goto ext_call_fail;
4008 }
4009 Py_DECREF(kwdict);
4010 kwdict = d;
4011 }
4012 }
4013 if (flags & CALL_FLAG_VAR) {
4014 stararg = EXT_POP(*pp_stack);
4015 if (!PyTuple_Check(stararg)) {
4016 PyObject *t = NULL;
4017 t = PySequence_Tuple(stararg);
4018 if (t == NULL) {
4019 if (PyErr_ExceptionMatches(PyExc_TypeError)) {
4020 PyErr_Format(PyExc_TypeError,
4021 "%.200s%.200s argument after * "
4022 "must be a sequence, not %200s",
4023 PyEval_GetFuncName(func),
4024 PyEval_GetFuncDesc(func),
4025 stararg->ob_type->tp_name);
4026 }
4027 goto ext_call_fail;
4028 }
4029 Py_DECREF(stararg);
4030 stararg = t;
4031 }
4032 nstar = PyTuple_GET_SIZE(stararg);
4033 }
4034 if (nk > 0) {
4035 kwdict = update_keyword_args(kwdict, nk, pp_stack, func);
4036 if (kwdict == NULL)
4037 goto ext_call_fail;
4038 }
4039 callargs = update_star_args(na, nstar, stararg, pp_stack);
4040 if (callargs == NULL)
4041 goto ext_call_fail;
4042#ifdef CALL_PROFILE
4043 /* At this point, we have to look at the type of func to
4044 update the call stats properly. Do it here so as to avoid
4045 exposing the call stats machinery outside ceval.c
4046 */
4047 if (PyFunction_Check(func))
4048 PCALL(PCALL_FUNCTION);
4049 else if (PyMethod_Check(func))
4050 PCALL(PCALL_METHOD);
4051 else if (PyType_Check(func))
4052 PCALL(PCALL_TYPE);
4053 else if (PyCFunction_Check(func))
4054 PCALL(PCALL_CFUNCTION);
4055 else
4056 PCALL(PCALL_OTHER);
4057#endif
4058 if (PyCFunction_Check(func)) {
4059 PyThreadState *tstate = PyThreadState_GET();
4060 C_TRACE(result, PyCFunction_Call(func, callargs, kwdict));
4061 }
4062 else
4063 result = PyObject_Call(func, callargs, kwdict);
4064ext_call_fail:
4065 Py_XDECREF(callargs);
4066 Py_XDECREF(kwdict);
4067 Py_XDECREF(stararg);
4068 return result;
4069}
4070
4071/* Extract a slice index from a PyInt or PyLong or an object with the
4072 nb_index slot defined, and store in *pi.
4073 Silently reduce values larger than PY_SSIZE_T_MAX to PY_SSIZE_T_MAX,
4074 and silently boost values less than -PY_SSIZE_T_MAX-1 to -PY_SSIZE_T_MAX-1.
4075 Return 0 on error, 1 on success.
4076*/
4077/* Note: If v is NULL, return success without storing into *pi. This
4078 is because_PyEval_SliceIndex() is called by apply_slice(), which can be
4079 called by the SLICE opcode with v and/or w equal to NULL.
4080*/
4081int
4082_PyEval_SliceIndex(PyObject *v, Py_ssize_t *pi)
4083{
4084 if (v != NULL) {
4085 Py_ssize_t x;
4086 if (PyInt_Check(v)) {
4087 /* XXX(nnorwitz): I think PyInt_AS_LONG is correct,
4088 however, it looks like it should be AsSsize_t.
4089 There should be a comment here explaining why.
4090 */
4091 x = PyInt_AS_LONG(v);
4092 }
4093 else if (PyIndex_Check(v)) {
4094 x = PyNumber_AsSsize_t(v, NULL);
4095 if (x == -1 && PyErr_Occurred())
4096 return 0;
4097 }
4098 else {
4099 PyErr_SetString(PyExc_TypeError,
4100 "slice indices must be integers or "
4101 "None or have an __index__ method");
4102 return 0;
4103 }
4104 *pi = x;
4105 }
4106 return 1;
4107}
4108
4109#undef ISINDEX
4110#define ISINDEX(x) ((x) == NULL || \
4111 PyInt_Check(x) || PyLong_Check(x) || PyIndex_Check(x))
4112
4113static PyObject *
4114apply_slice(PyObject *u, PyObject *v, PyObject *w) /* return u[v:w] */
4115{
4116 PyTypeObject *tp = u->ob_type;
4117 PySequenceMethods *sq = tp->tp_as_sequence;
4118
4119 if (sq && sq->sq_slice && ISINDEX(v) && ISINDEX(w)) {
4120 Py_ssize_t ilow = 0, ihigh = PY_SSIZE_T_MAX;
4121 if (!_PyEval_SliceIndex(v, &ilow))
4122 return NULL;
4123 if (!_PyEval_SliceIndex(w, &ihigh))
4124 return NULL;
4125 return PySequence_GetSlice(u, ilow, ihigh);
4126 }
4127 else {
4128 PyObject *slice = PySlice_New(v, w, NULL);
4129 if (slice != NULL) {
4130 PyObject *res = PyObject_GetItem(u, slice);
4131 Py_DECREF(slice);
4132 return res;
4133 }
4134 else
4135 return NULL;
4136 }
4137}
4138
4139static int
4140assign_slice(PyObject *u, PyObject *v, PyObject *w, PyObject *x)
4141 /* u[v:w] = x */
4142{
4143 PyTypeObject *tp = u->ob_type;
4144 PySequenceMethods *sq = tp->tp_as_sequence;
4145
4146 if (sq && sq->sq_ass_slice && ISINDEX(v) && ISINDEX(w)) {
4147 Py_ssize_t ilow = 0, ihigh = PY_SSIZE_T_MAX;
4148 if (!_PyEval_SliceIndex(v, &ilow))
4149 return -1;
4150 if (!_PyEval_SliceIndex(w, &ihigh))
4151 return -1;
4152 if (x == NULL)
4153 return PySequence_DelSlice(u, ilow, ihigh);
4154 else
4155 return PySequence_SetSlice(u, ilow, ihigh, x);
4156 }
4157 else {
4158 PyObject *slice = PySlice_New(v, w, NULL);
4159 if (slice != NULL) {
4160 int res;
4161 if (x != NULL)
4162 res = PyObject_SetItem(u, slice, x);
4163 else
4164 res = PyObject_DelItem(u, slice);
4165 Py_DECREF(slice);
4166 return res;
4167 }
4168 else
4169 return -1;
4170 }
4171}
4172
4173#define Py3kExceptionClass_Check(x) \
4174 (PyType_Check((x)) && \
4175 PyType_FastSubclass((PyTypeObject*)(x), Py_TPFLAGS_BASE_EXC_SUBCLASS))
4176
4177#define CANNOT_CATCH_MSG "catching classes that don't inherit from " \
4178 "BaseException is not allowed in 3.x"
4179
4180static PyObject *
4181cmp_outcome(int op, register PyObject *v, register PyObject *w)
4182{
4183 int res = 0;
4184 switch (op) {
4185 case PyCmp_IS:
4186 res = (v == w);
4187 break;
4188 case PyCmp_IS_NOT:
4189 res = (v != w);
4190 break;
4191 case PyCmp_IN:
4192 res = PySequence_Contains(w, v);
4193 if (res < 0)
4194 return NULL;
4195 break;
4196 case PyCmp_NOT_IN:
4197 res = PySequence_Contains(w, v);
4198 if (res < 0)
4199 return NULL;
4200 res = !res;
4201 break;
4202 case PyCmp_EXC_MATCH:
4203 if (PyTuple_Check(w)) {
4204 Py_ssize_t i, length;
4205 length = PyTuple_Size(w);
4206 for (i = 0; i < length; i += 1) {
4207 PyObject *exc = PyTuple_GET_ITEM(w, i);
4208 if (PyString_Check(exc)) {
4209 int ret_val;
4210 ret_val = PyErr_WarnEx(
4211 PyExc_DeprecationWarning,
4212 "catching of string "
4213 "exceptions is deprecated", 1);
4214 if (ret_val < 0)
4215 return NULL;
4216 }
4217 else if (Py_Py3kWarningFlag &&
4218 !PyTuple_Check(exc) &&
4219 !Py3kExceptionClass_Check(exc))
4220 {
4221 int ret_val;
4222 ret_val = PyErr_WarnEx(
4223 PyExc_DeprecationWarning,
4224 CANNOT_CATCH_MSG, 1);
4225 if (ret_val < 0)
4226 return NULL;
4227 }
4228 }
4229 }
4230 else {
4231 if (PyString_Check(w)) {
4232 int ret_val;
4233 ret_val = PyErr_WarnEx(
4234 PyExc_DeprecationWarning,
4235 "catching of string "
4236 "exceptions is deprecated", 1);
4237 if (ret_val < 0)
4238 return NULL;
4239 }
4240 else if (Py_Py3kWarningFlag &&
4241 !PyTuple_Check(w) &&
4242 !Py3kExceptionClass_Check(w))
4243 {
4244 int ret_val;
4245 ret_val = PyErr_WarnEx(
4246 PyExc_DeprecationWarning,
4247 CANNOT_CATCH_MSG, 1);
4248 if (ret_val < 0)
4249 return NULL;
4250 }
4251 }
4252 res = PyErr_GivenExceptionMatches(v, w);
4253 break;
4254 default:
4255 return PyObject_RichCompare(v, w, op);
4256 }
4257 v = res ? Py_True : Py_False;
4258 Py_INCREF(v);
4259 return v;
4260}
4261
4262static PyObject *
4263import_from(PyObject *v, PyObject *name)
4264{
4265 PyObject *x;
4266
4267 x = PyObject_GetAttr(v, name);
4268 if (x == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) {
4269 PyErr_Format(PyExc_ImportError,
4270 "cannot import name %.230s",
4271 PyString_AsString(name));
4272 }
4273 return x;
4274}
4275
4276static int
4277import_all_from(PyObject *locals, PyObject *v)
4278{
4279 PyObject *all = PyObject_GetAttrString(v, "__all__");
4280 PyObject *dict, *name, *value;
4281 int skip_leading_underscores = 0;
4282 int pos, err;
4283
4284 if (all == NULL) {
4285 if (!PyErr_ExceptionMatches(PyExc_AttributeError))
4286 return -1; /* Unexpected error */
4287 PyErr_Clear();
4288 dict = PyObject_GetAttrString(v, "__dict__");
4289 if (dict == NULL) {
4290 if (!PyErr_ExceptionMatches(PyExc_AttributeError))
4291 return -1;
4292 PyErr_SetString(PyExc_ImportError,
4293 "from-import-* object has no __dict__ and no __all__");
4294 return -1;
4295 }
4296 all = PyMapping_Keys(dict);
4297 Py_DECREF(dict);
4298 if (all == NULL)
4299 return -1;
4300 skip_leading_underscores = 1;
4301 }
4302
4303 for (pos = 0, err = 0; ; pos++) {
4304 name = PySequence_GetItem(all, pos);
4305 if (name == NULL) {
4306 if (!PyErr_ExceptionMatches(PyExc_IndexError))
4307 err = -1;
4308 else
4309 PyErr_Clear();
4310 break;
4311 }
4312 if (skip_leading_underscores &&
4313 PyString_Check(name) &&
4314 PyString_AS_STRING(name)[0] == '_')
4315 {
4316 Py_DECREF(name);
4317 continue;
4318 }
4319 value = PyObject_GetAttr(v, name);
4320 if (value == NULL)
4321 err = -1;
4322 else if (PyDict_CheckExact(locals))
4323 err = PyDict_SetItem(locals, name, value);
4324 else
4325 err = PyObject_SetItem(locals, name, value);
4326 Py_DECREF(name);
4327 Py_XDECREF(value);
4328 if (err != 0)
4329 break;
4330 }
4331 Py_DECREF(all);
4332 return err;
4333}
4334
4335static PyObject *
4336build_class(PyObject *methods, PyObject *bases, PyObject *name)
4337{
4338 PyObject *metaclass = NULL, *result, *base;
4339
4340 if (PyDict_Check(methods))
4341 metaclass = PyDict_GetItemString(methods, "__metaclass__");
4342 if (metaclass != NULL)
4343 Py_INCREF(metaclass);
4344 else if (PyTuple_Check(bases) && PyTuple_GET_SIZE(bases) > 0) {
4345 base = PyTuple_GET_ITEM(bases, 0);
4346 metaclass = PyObject_GetAttrString(base, "__class__");
4347 if (metaclass == NULL) {
4348 PyErr_Clear();
4349 metaclass = (PyObject *)base->ob_type;
4350 Py_INCREF(metaclass);
4351 }
4352 }
4353 else {
4354 PyObject *g = PyEval_GetGlobals();
4355 if (g != NULL && PyDict_Check(g))
4356 metaclass = PyDict_GetItemString(g, "__metaclass__");
4357 if (metaclass == NULL)
4358 metaclass = (PyObject *) &PyClass_Type;
4359 Py_INCREF(metaclass);
4360 }
4361 result = PyObject_CallFunctionObjArgs(metaclass, name, bases, methods,
4362 NULL);
4363 Py_DECREF(metaclass);
4364 if (result == NULL && PyErr_ExceptionMatches(PyExc_TypeError)) {
4365 /* A type error here likely means that the user passed
4366 in a base that was not a class (such the random module
4367 instead of the random.random type). Help them out with
4368 by augmenting the error message with more information.*/
4369
4370 PyObject *ptype, *pvalue, *ptraceback;
4371
4372 PyErr_Fetch(&ptype, &pvalue, &ptraceback);
4373 if (PyString_Check(pvalue)) {
4374 PyObject *newmsg;
4375 newmsg = PyString_FromFormat(
4376 "Error when calling the metaclass bases\n"
4377 " %s",
4378 PyString_AS_STRING(pvalue));
4379 if (newmsg != NULL) {
4380 Py_DECREF(pvalue);
4381 pvalue = newmsg;
4382 }
4383 }
4384 PyErr_Restore(ptype, pvalue, ptraceback);
4385 }
4386 return result;
4387}
4388
4389static int
4390exec_statement(PyFrameObject *f, PyObject *prog, PyObject *globals,
4391 PyObject *locals)
4392{
4393 int n;
4394 PyObject *v;
4395 int plain = 0;
4396
4397 if (PyTuple_Check(prog) && globals == Py_None && locals == Py_None &&
4398 ((n = PyTuple_Size(prog)) == 2 || n == 3)) {
4399 /* Backward compatibility hack */
4400 globals = PyTuple_GetItem(prog, 1);
4401 if (n == 3)
4402 locals = PyTuple_GetItem(prog, 2);
4403 prog = PyTuple_GetItem(prog, 0);
4404 }
4405 if (globals == Py_None) {
4406 globals = PyEval_GetGlobals();
4407 if (locals == Py_None) {
4408 locals = PyEval_GetLocals();
4409 plain = 1;
4410 }
4411 if (!globals || !locals) {
4412 PyErr_SetString(PyExc_SystemError,
4413 "globals and locals cannot be NULL");
4414 return -1;
4415 }
4416 }
4417 else if (locals == Py_None)
4418 locals = globals;
4419 if (!PyString_Check(prog) &&
4420 !PyUnicode_Check(prog) &&
4421 !PyCode_Check(prog) &&
4422 !PyFile_Check(prog)) {
4423 PyErr_SetString(PyExc_TypeError,
4424 "exec: arg 1 must be a string, file, or code object");
4425 return -1;
4426 }
4427 if (!PyDict_Check(globals)) {
4428 PyErr_SetString(PyExc_TypeError,
4429 "exec: arg 2 must be a dictionary or None");
4430 return -1;
4431 }
4432 if (!PyMapping_Check(locals)) {
4433 PyErr_SetString(PyExc_TypeError,
4434 "exec: arg 3 must be a mapping or None");
4435 return -1;
4436 }
4437 if (PyDict_GetItemString(globals, "__builtins__") == NULL)
4438 PyDict_SetItemString(globals, "__builtins__", f->f_builtins);
4439 if (PyCode_Check(prog)) {
4440 if (PyCode_GetNumFree((PyCodeObject *)prog) > 0) {
4441 PyErr_SetString(PyExc_TypeError,
4442 "code object passed to exec may not contain free variables");
4443 return -1;
4444 }
4445 v = PyEval_EvalCode((PyCodeObject *) prog, globals, locals);
4446 }
4447 else if (PyFile_Check(prog)) {
4448 FILE *fp = PyFile_AsFile(prog);
4449 char *name = PyString_AsString(PyFile_Name(prog));
4450 PyCompilerFlags cf;
4451 if (name == NULL)
4452 return -1;
4453 cf.cf_flags = 0;
4454 if (PyEval_MergeCompilerFlags(&cf))
4455 v = PyRun_FileFlags(fp, name, Py_file_input, globals,
4456 locals, &cf);
4457 else
4458 v = PyRun_File(fp, name, Py_file_input, globals,
4459 locals);
4460 }
4461 else {
4462 PyObject *tmp = NULL;
4463 char *str;
4464 PyCompilerFlags cf;
4465 cf.cf_flags = 0;
4466#ifdef Py_USING_UNICODE
4467 if (PyUnicode_Check(prog)) {
4468 tmp = PyUnicode_AsUTF8String(prog);
4469 if (tmp == NULL)
4470 return -1;
4471 prog = tmp;
4472 cf.cf_flags |= PyCF_SOURCE_IS_UTF8;
4473 }
4474#endif
4475 if (PyString_AsStringAndSize(prog, &str, NULL))
4476 return -1;
4477 if (PyEval_MergeCompilerFlags(&cf))
4478 v = PyRun_StringFlags(str, Py_file_input, globals,
4479 locals, &cf);
4480 else
4481 v = PyRun_String(str, Py_file_input, globals, locals);
4482 Py_XDECREF(tmp);
4483 }
4484 if (plain)
4485 PyFrame_LocalsToFast(f, 0);
4486 if (v == NULL)
4487 return -1;
4488 Py_DECREF(v);
4489 return 0;
4490}
4491
4492static void
4493format_exc_check_arg(PyObject *exc, char *format_str, PyObject *obj)
4494{
4495 char *obj_str;
4496
4497 if (!obj)
4498 return;
4499
4500 obj_str = PyString_AsString(obj);
4501 if (!obj_str)
4502 return;
4503
4504 PyErr_Format(exc, format_str, obj_str);
4505}
4506
4507static PyObject *
4508string_concatenate(PyObject *v, PyObject *w,
4509 PyFrameObject *f, unsigned char *next_instr)
4510{
4511 /* This function implements 'variable += expr' when both arguments
4512 are strings. */
4513 Py_ssize_t v_len = PyString_GET_SIZE(v);
4514 Py_ssize_t w_len = PyString_GET_SIZE(w);
4515 Py_ssize_t new_len = v_len + w_len;
4516 if (new_len < 0) {
4517 PyErr_SetString(PyExc_OverflowError,
4518 "strings are too large to concat");
4519 return NULL;
4520 }
4521
4522 if (v->ob_refcnt == 2) {
4523 /* In the common case, there are 2 references to the value
4524 * stored in 'variable' when the += is performed: one on the
4525 * value stack (in 'v') and one still stored in the
4526 * 'variable'. We try to delete the variable now to reduce
4527 * the refcnt to 1.
4528 */
4529 switch (*next_instr) {
4530 case STORE_FAST:
4531 {
4532 int oparg = PEEKARG();
4533 PyObject **fastlocals = f->f_localsplus;
4534 if (GETLOCAL(oparg) == v)
4535 SETLOCAL(oparg, NULL);
4536 break;
4537 }
4538 case STORE_DEREF:
4539 {
4540 PyObject **freevars = (f->f_localsplus +
4541 f->f_code->co_nlocals);
4542 PyObject *c = freevars[PEEKARG()];
4543 if (PyCell_GET(c) == v)
4544 PyCell_Set(c, NULL);
4545 break;
4546 }
4547 case STORE_NAME:
4548 {
4549 PyObject *names = f->f_code->co_names;
4550 PyObject *name = GETITEM(names, PEEKARG());
4551 PyObject *locals = f->f_locals;
4552 if (PyDict_CheckExact(locals) &&
4553 PyDict_GetItem(locals, name) == v) {
4554 if (PyDict_DelItem(locals, name) != 0) {
4555 PyErr_Clear();
4556 }
4557 }
4558 break;
4559 }
4560 }
4561 }
4562
4563 if (v->ob_refcnt == 1 && !PyString_CHECK_INTERNED(v)) {
4564 /* Now we own the last reference to 'v', so we can resize it
4565 * in-place.
4566 */
4567 if (_PyString_Resize(&v, new_len) != 0) {
4568 /* XXX if _PyString_Resize() fails, 'v' has been
4569 * deallocated so it cannot be put back into
4570 * 'variable'. The MemoryError is raised when there
4571 * is no value in 'variable', which might (very
4572 * remotely) be a cause of incompatibilities.
4573 */
4574 return NULL;
4575 }
4576 /* copy 'w' into the newly allocated area of 'v' */
4577 memcpy(PyString_AS_STRING(v) + v_len,
4578 PyString_AS_STRING(w), w_len);
4579 return v;
4580 }
4581 else {
4582 /* When in-place resizing is not an option. */
4583 PyString_Concat(&v, w);
4584 return v;
4585 }
4586}
4587
4588#ifdef DYNAMIC_EXECUTION_PROFILE
4589
4590static PyObject *
4591getarray(long a[256])
4592{
4593 int i;
4594 PyObject *l = PyList_New(256);
4595 if (l == NULL) return NULL;
4596 for (i = 0; i < 256; i++) {
4597 PyObject *x = PyInt_FromLong(a[i]);
4598 if (x == NULL) {
4599 Py_DECREF(l);
4600 return NULL;
4601 }
4602 PyList_SetItem(l, i, x);
4603 }
4604 for (i = 0; i < 256; i++)
4605 a[i] = 0;
4606 return l;
4607}
4608
4609PyObject *
4610_Py_GetDXProfile(PyObject *self, PyObject *args)
4611{
4612#ifndef DXPAIRS
4613 return getarray(dxp);
4614#else
4615 int i;
4616 PyObject *l = PyList_New(257);
4617 if (l == NULL) return NULL;
4618 for (i = 0; i < 257; i++) {
4619 PyObject *x = getarray(dxpairs[i]);
4620 if (x == NULL) {
4621 Py_DECREF(l);
4622 return NULL;
4623 }
4624 PyList_SetItem(l, i, x);
4625 }
4626 return l;
4627#endif
4628}
4629
4630#endif
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