forked from glix/python
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcompile.c
More file actions
3982 lines (3591 loc) · 93.6 KB
/
compile.c
File metadata and controls
3982 lines (3591 loc) · 93.6 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* This file compiles an abstract syntax tree (AST) into Python bytecode.
*
* The primary entry point is PyAST_Compile(), which returns a
* PyCodeObject. The compiler makes several passes to build the code
* object:
* 1. Checks for future statements. See future.c
* 2. Builds a symbol table. See symtable.c.
* 3. Generate code for basic blocks. See compiler_mod() in this file.
* 4. Assemble the basic blocks into final code. See assemble() in
* this file.
* 5. Optimize the byte code (peephole optimizations). See peephole.c
*
* Note that compiler_mod() suggests module, but the module ast type
* (mod_ty) has cases for expressions and interactive statements.
*
* CAUTION: The VISIT_* macros abort the current function when they
* encounter a problem. So don't invoke them when there is memory
* which needs to be released. Code blocks are OK, as the compiler
* structure takes care of releasing those. Use the arena to manage
* objects.
*/
#include "Python.h"
#include "Python-ast.h"
#include "node.h"
#include "pyarena.h"
#include "ast.h"
#include "code.h"
#include "compile.h"
#include "symtable.h"
#include "opcode.h"
int Py_OptimizeFlag = 0;
#define DEFAULT_BLOCK_SIZE 16
#define DEFAULT_BLOCKS 8
#define DEFAULT_CODE_SIZE 128
#define DEFAULT_LNOTAB_SIZE 16
struct instr {
unsigned i_jabs : 1;
unsigned i_jrel : 1;
unsigned i_hasarg : 1;
unsigned char i_opcode;
int i_oparg;
struct basicblock_ *i_target; /* target block (if jump instruction) */
int i_lineno;
};
typedef struct basicblock_ {
/* Each basicblock in a compilation unit is linked via b_list in the
reverse order that the block are allocated. b_list points to the next
block, not to be confused with b_next, which is next by control flow. */
struct basicblock_ *b_list;
/* number of instructions used */
int b_iused;
/* length of instruction array (b_instr) */
int b_ialloc;
/* pointer to an array of instructions, initially NULL */
struct instr *b_instr;
/* If b_next is non-NULL, it is a pointer to the next
block reached by normal control flow. */
struct basicblock_ *b_next;
/* b_seen is used to perform a DFS of basicblocks. */
unsigned b_seen : 1;
/* b_return is true if a RETURN_VALUE opcode is inserted. */
unsigned b_return : 1;
/* depth of stack upon entry of block, computed by stackdepth() */
int b_startdepth;
/* instruction offset for block, computed by assemble_jump_offsets() */
int b_offset;
} basicblock;
/* fblockinfo tracks the current frame block.
A frame block is used to handle loops, try/except, and try/finally.
It's called a frame block to distinguish it from a basic block in the
compiler IR.
*/
enum fblocktype { LOOP, EXCEPT, FINALLY_TRY, FINALLY_END };
struct fblockinfo {
enum fblocktype fb_type;
basicblock *fb_block;
};
/* The following items change on entry and exit of code blocks.
They must be saved and restored when returning to a block.
*/
struct compiler_unit {
PySTEntryObject *u_ste;
PyObject *u_name;
/* The following fields are dicts that map objects to
the index of them in co_XXX. The index is used as
the argument for opcodes that refer to those collections.
*/
PyObject *u_consts; /* all constants */
PyObject *u_names; /* all names */
PyObject *u_varnames; /* local variables */
PyObject *u_cellvars; /* cell variables */
PyObject *u_freevars; /* free variables */
PyObject *u_private; /* for private name mangling */
int u_argcount; /* number of arguments for block */
/* Pointer to the most recently allocated block. By following b_list
members, you can reach all early allocated blocks. */
basicblock *u_blocks;
basicblock *u_curblock; /* pointer to current block */
int u_tmpname; /* temporary variables for list comps */
int u_nfblocks;
struct fblockinfo u_fblock[CO_MAXBLOCKS];
int u_firstlineno; /* the first lineno of the block */
int u_lineno; /* the lineno for the current stmt */
bool u_lineno_set; /* boolean to indicate whether instr
has been generated with current lineno */
};
/* This struct captures the global state of a compilation.
The u pointer points to the current compilation unit, while units
for enclosing blocks are stored in c_stack. The u and c_stack are
managed by compiler_enter_scope() and compiler_exit_scope().
*/
struct compiler {
const char *c_filename;
struct symtable *c_st;
PyFutureFeatures *c_future; /* pointer to module's __future__ */
PyCompilerFlags *c_flags;
int c_interactive; /* true if in interactive mode */
int c_nestlevel;
struct compiler_unit *u; /* compiler state for current block */
PyObject *c_stack; /* Python list holding compiler_unit ptrs */
char *c_encoding; /* source encoding (a borrowed reference) */
PyArena *c_arena; /* pointer to memory allocation arena */
};
static int compiler_enter_scope(struct compiler *, identifier, void *, int);
static void compiler_free(struct compiler *);
static basicblock *compiler_new_block(struct compiler *);
static int compiler_next_instr(struct compiler *, basicblock *);
static int compiler_addop(struct compiler *, int);
static int compiler_addop_o(struct compiler *, int, PyObject *, PyObject *);
static int compiler_addop_i(struct compiler *, int, int);
static int compiler_addop_j(struct compiler *, int, basicblock *, int);
static basicblock *compiler_use_new_block(struct compiler *);
static int compiler_error(struct compiler *, const char *);
static int compiler_nameop(struct compiler *, identifier, expr_context_ty);
static PyCodeObject *compiler_mod(struct compiler *, mod_ty);
static int compiler_visit_stmt(struct compiler *, stmt_ty);
static int compiler_visit_keyword(struct compiler *, keyword_ty);
static int compiler_visit_expr(struct compiler *, expr_ty);
static int compiler_augassign(struct compiler *, stmt_ty);
static int compiler_visit_slice(struct compiler *, slice_ty,
expr_context_ty);
static int compiler_push_fblock(struct compiler *, enum fblocktype,
basicblock *);
static void compiler_pop_fblock(struct compiler *, enum fblocktype,
basicblock *);
/* Returns true if there is a loop on the fblock stack. */
static int compiler_in_loop(struct compiler *);
static int inplace_binop(struct compiler *, operator_ty);
static int expr_constant(expr_ty e);
static int compiler_with(struct compiler *, stmt_ty);
static PyCodeObject *assemble(struct compiler *, int addNone);
static PyObject *__doc__;
PyObject *
_Py_Mangle(PyObject *privateobj, PyObject *ident)
{
/* Name mangling: __private becomes _classname__private.
This is independent from how the name is used. */
const char *p, *name = PyString_AsString(ident);
char *buffer;
size_t nlen, plen;
if (privateobj == NULL || !PyString_Check(privateobj) ||
name == NULL || name[0] != '_' || name[1] != '_') {
Py_INCREF(ident);
return ident;
}
p = PyString_AsString(privateobj);
nlen = strlen(name);
/* Don't mangle __id__ or names with dots.
The only time a name with a dot can occur is when
we are compiling an import statement that has a
package name.
TODO(jhylton): Decide whether we want to support
mangling of the module name, e.g. __M.X.
*/
if ((name[nlen-1] == '_' && name[nlen-2] == '_')
|| strchr(name, '.')) {
Py_INCREF(ident);
return ident; /* Don't mangle __whatever__ */
}
/* Strip leading underscores from class name */
while (*p == '_')
p++;
if (*p == '\0') {
Py_INCREF(ident);
return ident; /* Don't mangle if class is just underscores */
}
plen = strlen(p);
assert(1 <= PY_SSIZE_T_MAX - nlen);
assert(1 + nlen <= PY_SSIZE_T_MAX - plen);
ident = PyString_FromStringAndSize(NULL, 1 + nlen + plen);
if (!ident)
return 0;
/* ident = "_" + p[:plen] + name # i.e. 1+plen+nlen bytes */
buffer = PyString_AS_STRING(ident);
buffer[0] = '_';
strncpy(buffer+1, p, plen);
strcpy(buffer+1+plen, name);
return ident;
}
static int
compiler_init(struct compiler *c)
{
memset(c, 0, sizeof(struct compiler));
c->c_stack = PyList_New(0);
if (!c->c_stack)
return 0;
return 1;
}
PyCodeObject *
PyAST_Compile(mod_ty mod, const char *filename, PyCompilerFlags *flags,
PyArena *arena)
{
struct compiler c;
PyCodeObject *co = NULL;
PyCompilerFlags local_flags;
int merged;
if (!__doc__) {
__doc__ = PyString_InternFromString("__doc__");
if (!__doc__)
return NULL;
}
if (!compiler_init(&c))
return NULL;
c.c_filename = filename;
c.c_arena = arena;
c.c_future = PyFuture_FromAST(mod, filename);
if (c.c_future == NULL)
goto finally;
if (!flags) {
local_flags.cf_flags = 0;
flags = &local_flags;
}
merged = c.c_future->ff_features | flags->cf_flags;
c.c_future->ff_features = merged;
flags->cf_flags = merged;
c.c_flags = flags;
c.c_nestlevel = 0;
c.c_st = PySymtable_Build(mod, filename, c.c_future);
if (c.c_st == NULL) {
if (!PyErr_Occurred())
PyErr_SetString(PyExc_SystemError, "no symtable");
goto finally;
}
/* XXX initialize to NULL for now, need to handle */
c.c_encoding = NULL;
co = compiler_mod(&c, mod);
finally:
compiler_free(&c);
assert(co || PyErr_Occurred());
return co;
}
PyCodeObject *
PyNode_Compile(struct _node *n, const char *filename)
{
PyCodeObject *co = NULL;
mod_ty mod;
PyArena *arena = PyArena_New();
if (!arena)
return NULL;
mod = PyAST_FromNode(n, NULL, filename, arena);
if (mod)
co = PyAST_Compile(mod, filename, NULL, arena);
PyArena_Free(arena);
return co;
}
static void
compiler_free(struct compiler *c)
{
if (c->c_st)
PySymtable_Free(c->c_st);
if (c->c_future)
PyObject_Free(c->c_future);
Py_DECREF(c->c_stack);
}
static PyObject *
list2dict(PyObject *list)
{
Py_ssize_t i, n;
PyObject *v, *k;
PyObject *dict = PyDict_New();
if (!dict) return NULL;
n = PyList_Size(list);
for (i = 0; i < n; i++) {
v = PyInt_FromLong(i);
if (!v) {
Py_DECREF(dict);
return NULL;
}
k = PyList_GET_ITEM(list, i);
k = PyTuple_Pack(2, k, k->ob_type);
if (k == NULL || PyDict_SetItem(dict, k, v) < 0) {
Py_XDECREF(k);
Py_DECREF(v);
Py_DECREF(dict);
return NULL;
}
Py_DECREF(k);
Py_DECREF(v);
}
return dict;
}
/* Return new dict containing names from src that match scope(s).
src is a symbol table dictionary. If the scope of a name matches
either scope_type or flag is set, insert it into the new dict. The
values are integers, starting at offset and increasing by one for
each key.
*/
static PyObject *
dictbytype(PyObject *src, int scope_type, int flag, int offset)
{
Py_ssize_t pos = 0, i = offset, scope;
PyObject *k, *v, *dest = PyDict_New();
assert(offset >= 0);
if (dest == NULL)
return NULL;
while (PyDict_Next(src, &pos, &k, &v)) {
/* XXX this should probably be a macro in symtable.h */
assert(PyInt_Check(v));
scope = (PyInt_AS_LONG(v) >> SCOPE_OFF) & SCOPE_MASK;
if (scope == scope_type || PyInt_AS_LONG(v) & flag) {
PyObject *tuple, *item = PyInt_FromLong(i);
if (item == NULL) {
Py_DECREF(dest);
return NULL;
}
i++;
tuple = PyTuple_Pack(2, k, k->ob_type);
if (!tuple || PyDict_SetItem(dest, tuple, item) < 0) {
Py_DECREF(item);
Py_DECREF(dest);
Py_XDECREF(tuple);
return NULL;
}
Py_DECREF(item);
Py_DECREF(tuple);
}
}
return dest;
}
static void
compiler_unit_check(struct compiler_unit *u)
{
basicblock *block;
for (block = u->u_blocks; block != NULL; block = block->b_list) {
assert((void *)block != (void *)0xcbcbcbcb);
assert((void *)block != (void *)0xfbfbfbfb);
assert((void *)block != (void *)0xdbdbdbdb);
if (block->b_instr != NULL) {
assert(block->b_ialloc > 0);
assert(block->b_iused > 0);
assert(block->b_ialloc >= block->b_iused);
}
else {
assert (block->b_iused == 0);
assert (block->b_ialloc == 0);
}
}
}
static void
compiler_unit_free(struct compiler_unit *u)
{
basicblock *b, *next;
compiler_unit_check(u);
b = u->u_blocks;
while (b != NULL) {
if (b->b_instr)
PyObject_Free((void *)b->b_instr);
next = b->b_list;
PyObject_Free((void *)b);
b = next;
}
Py_CLEAR(u->u_ste);
Py_CLEAR(u->u_name);
Py_CLEAR(u->u_consts);
Py_CLEAR(u->u_names);
Py_CLEAR(u->u_varnames);
Py_CLEAR(u->u_freevars);
Py_CLEAR(u->u_cellvars);
Py_CLEAR(u->u_private);
PyObject_Free(u);
}
static int
compiler_enter_scope(struct compiler *c, identifier name, void *key,
int lineno)
{
struct compiler_unit *u;
u = (struct compiler_unit *)PyObject_Malloc(sizeof(
struct compiler_unit));
if (!u) {
PyErr_NoMemory();
return 0;
}
memset(u, 0, sizeof(struct compiler_unit));
u->u_argcount = 0;
u->u_ste = PySymtable_Lookup(c->c_st, key);
if (!u->u_ste) {
compiler_unit_free(u);
return 0;
}
Py_INCREF(name);
u->u_name = name;
u->u_varnames = list2dict(u->u_ste->ste_varnames);
u->u_cellvars = dictbytype(u->u_ste->ste_symbols, CELL, 0, 0);
if (!u->u_varnames || !u->u_cellvars) {
compiler_unit_free(u);
return 0;
}
u->u_freevars = dictbytype(u->u_ste->ste_symbols, FREE, DEF_FREE_CLASS,
PyDict_Size(u->u_cellvars));
if (!u->u_freevars) {
compiler_unit_free(u);
return 0;
}
u->u_blocks = NULL;
u->u_tmpname = 0;
u->u_nfblocks = 0;
u->u_firstlineno = lineno;
u->u_lineno = 0;
u->u_lineno_set = false;
u->u_consts = PyDict_New();
if (!u->u_consts) {
compiler_unit_free(u);
return 0;
}
u->u_names = PyDict_New();
if (!u->u_names) {
compiler_unit_free(u);
return 0;
}
u->u_private = NULL;
/* Push the old compiler_unit on the stack. */
if (c->u) {
PyObject *wrapper = PyCObject_FromVoidPtr(c->u, NULL);
if (!wrapper || PyList_Append(c->c_stack, wrapper) < 0) {
Py_XDECREF(wrapper);
compiler_unit_free(u);
return 0;
}
Py_DECREF(wrapper);
u->u_private = c->u->u_private;
Py_XINCREF(u->u_private);
}
c->u = u;
c->c_nestlevel++;
if (compiler_use_new_block(c) == NULL)
return 0;
return 1;
}
static void
compiler_exit_scope(struct compiler *c)
{
int n;
PyObject *wrapper;
c->c_nestlevel--;
compiler_unit_free(c->u);
/* Restore c->u to the parent unit. */
n = PyList_GET_SIZE(c->c_stack) - 1;
if (n >= 0) {
wrapper = PyList_GET_ITEM(c->c_stack, n);
c->u = (struct compiler_unit *)PyCObject_AsVoidPtr(wrapper);
assert(c->u);
/* we are deleting from a list so this really shouldn't fail */
if (PySequence_DelItem(c->c_stack, n) < 0)
Py_FatalError("compiler_exit_scope()");
compiler_unit_check(c->u);
}
else
c->u = NULL;
}
/* Allocate a new "anonymous" local variable.
Used by list comprehensions and with statements.
*/
static PyObject *
compiler_new_tmpname(struct compiler *c)
{
char tmpname[256];
PyOS_snprintf(tmpname, sizeof(tmpname), "_[%d]", ++c->u->u_tmpname);
return PyString_FromString(tmpname);
}
/* Allocate a new block and return a pointer to it.
Returns NULL on error.
*/
static basicblock *
compiler_new_block(struct compiler *c)
{
basicblock *b;
struct compiler_unit *u;
u = c->u;
b = (basicblock *)PyObject_Malloc(sizeof(basicblock));
if (b == NULL) {
PyErr_NoMemory();
return NULL;
}
memset((void *)b, 0, sizeof(basicblock));
/* Extend the singly linked list of blocks with new block. */
b->b_list = u->u_blocks;
u->u_blocks = b;
return b;
}
static basicblock *
compiler_use_new_block(struct compiler *c)
{
basicblock *block = compiler_new_block(c);
if (block == NULL)
return NULL;
c->u->u_curblock = block;
return block;
}
static basicblock *
compiler_next_block(struct compiler *c)
{
basicblock *block = compiler_new_block(c);
if (block == NULL)
return NULL;
c->u->u_curblock->b_next = block;
c->u->u_curblock = block;
return block;
}
static basicblock *
compiler_use_next_block(struct compiler *c, basicblock *block)
{
assert(block != NULL);
c->u->u_curblock->b_next = block;
c->u->u_curblock = block;
return block;
}
/* Returns the offset of the next instruction in the current block's
b_instr array. Resizes the b_instr as necessary.
Returns -1 on failure.
*/
static int
compiler_next_instr(struct compiler *c, basicblock *b)
{
assert(b != NULL);
if (b->b_instr == NULL) {
b->b_instr = (struct instr *)PyObject_Malloc(
sizeof(struct instr) * DEFAULT_BLOCK_SIZE);
if (b->b_instr == NULL) {
PyErr_NoMemory();
return -1;
}
b->b_ialloc = DEFAULT_BLOCK_SIZE;
memset((char *)b->b_instr, 0,
sizeof(struct instr) * DEFAULT_BLOCK_SIZE);
}
else if (b->b_iused == b->b_ialloc) {
struct instr *tmp;
size_t oldsize, newsize;
oldsize = b->b_ialloc * sizeof(struct instr);
newsize = oldsize << 1;
if (oldsize > (PY_SIZE_MAX >> 1)) {
PyErr_NoMemory();
return -1;
}
if (newsize == 0) {
PyErr_NoMemory();
return -1;
}
b->b_ialloc <<= 1;
tmp = (struct instr *)PyObject_Realloc(
(void *)b->b_instr, newsize);
if (tmp == NULL) {
PyErr_NoMemory();
return -1;
}
b->b_instr = tmp;
memset((char *)b->b_instr + oldsize, 0, newsize - oldsize);
}
return b->b_iused++;
}
/* Set the i_lineno member of the instruction at offset off if the
line number for the current expression/statement has not
already been set. If it has been set, the call has no effect.
The line number is reset in the following cases:
- when entering a new scope
- on each statement
- on each expression that start a new line
- before the "except" clause
- before the "for" and "while" expressions
*/
static void
compiler_set_lineno(struct compiler *c, int off)
{
basicblock *b;
if (c->u->u_lineno_set)
return;
c->u->u_lineno_set = true;
b = c->u->u_curblock;
b->b_instr[off].i_lineno = c->u->u_lineno;
}
static int
opcode_stack_effect(int opcode, int oparg)
{
switch (opcode) {
case POP_TOP:
return -1;
case ROT_TWO:
case ROT_THREE:
return 0;
case DUP_TOP:
return 1;
case ROT_FOUR:
return 0;
case UNARY_POSITIVE:
case UNARY_NEGATIVE:
case UNARY_NOT:
case UNARY_CONVERT:
case UNARY_INVERT:
return 0;
case LIST_APPEND:
return -1;
case BINARY_POWER:
case BINARY_MULTIPLY:
case BINARY_DIVIDE:
case BINARY_MODULO:
case BINARY_ADD:
case BINARY_SUBTRACT:
case BINARY_SUBSCR:
case BINARY_FLOOR_DIVIDE:
case BINARY_TRUE_DIVIDE:
return -1;
case INPLACE_FLOOR_DIVIDE:
case INPLACE_TRUE_DIVIDE:
return -1;
case SLICE+0:
return 1;
case SLICE+1:
return 0;
case SLICE+2:
return 0;
case SLICE+3:
return -1;
case STORE_SLICE+0:
return -2;
case STORE_SLICE+1:
return -3;
case STORE_SLICE+2:
return -3;
case STORE_SLICE+3:
return -4;
case DELETE_SLICE+0:
return -1;
case DELETE_SLICE+1:
return -2;
case DELETE_SLICE+2:
return -2;
case DELETE_SLICE+3:
return -3;
case INPLACE_ADD:
case INPLACE_SUBTRACT:
case INPLACE_MULTIPLY:
case INPLACE_DIVIDE:
case INPLACE_MODULO:
return -1;
case STORE_SUBSCR:
return -3;
case STORE_MAP:
return -2;
case DELETE_SUBSCR:
return -2;
case BINARY_LSHIFT:
case BINARY_RSHIFT:
case BINARY_AND:
case BINARY_XOR:
case BINARY_OR:
return -1;
case INPLACE_POWER:
return -1;
case GET_ITER:
return 0;
case PRINT_EXPR:
return -1;
case PRINT_ITEM:
return -1;
case PRINT_NEWLINE:
return 0;
case PRINT_ITEM_TO:
return -2;
case PRINT_NEWLINE_TO:
return -1;
case INPLACE_LSHIFT:
case INPLACE_RSHIFT:
case INPLACE_AND:
case INPLACE_XOR:
case INPLACE_OR:
return -1;
case BREAK_LOOP:
return 0;
case WITH_CLEANUP:
return -1; /* XXX Sometimes more */
case LOAD_LOCALS:
return 1;
case RETURN_VALUE:
return -1;
case IMPORT_STAR:
return -1;
case EXEC_STMT:
return -3;
case YIELD_VALUE:
return 0;
case POP_BLOCK:
return 0;
case END_FINALLY:
return -1; /* or -2 or -3 if exception occurred */
case BUILD_CLASS:
return -2;
case STORE_NAME:
return -1;
case DELETE_NAME:
return 0;
case UNPACK_SEQUENCE:
return oparg-1;
case FOR_ITER:
return 1;
case STORE_ATTR:
return -2;
case DELETE_ATTR:
return -1;
case STORE_GLOBAL:
return -1;
case DELETE_GLOBAL:
return 0;
case DUP_TOPX:
return oparg;
case LOAD_CONST:
return 1;
case LOAD_NAME:
return 1;
case BUILD_TUPLE:
case BUILD_LIST:
return 1-oparg;
case BUILD_MAP:
return 1;
case LOAD_ATTR:
return 0;
case COMPARE_OP:
return -1;
case IMPORT_NAME:
return 0;
case IMPORT_FROM:
return 1;
case JUMP_FORWARD:
case JUMP_IF_FALSE:
case JUMP_IF_TRUE:
case JUMP_ABSOLUTE:
return 0;
case LOAD_GLOBAL:
return 1;
case CONTINUE_LOOP:
return 0;
case SETUP_LOOP:
return 0;
case SETUP_EXCEPT:
case SETUP_FINALLY:
return 3; /* actually pushed by an exception */
case LOAD_FAST:
return 1;
case STORE_FAST:
return -1;
case DELETE_FAST:
return 0;
case RAISE_VARARGS:
return -oparg;
#define NARGS(o) (((o) % 256) + 2*((o) / 256))
case CALL_FUNCTION:
return -NARGS(oparg);
case CALL_FUNCTION_VAR:
case CALL_FUNCTION_KW:
return -NARGS(oparg)-1;
case CALL_FUNCTION_VAR_KW:
return -NARGS(oparg)-2;
#undef NARGS
case MAKE_FUNCTION:
return -oparg;
case BUILD_SLICE:
if (oparg == 3)
return -2;
else
return -1;
case MAKE_CLOSURE:
return -oparg;
case LOAD_CLOSURE:
return 1;
case LOAD_DEREF:
return 1;
case STORE_DEREF:
return -1;
default:
fprintf(stderr, "opcode = %d\n", opcode);
Py_FatalError("opcode_stack_effect()");
}
return 0; /* not reachable */
}
/* Add an opcode with no argument.
Returns 0 on failure, 1 on success.
*/
static int
compiler_addop(struct compiler *c, int opcode)
{
basicblock *b;
struct instr *i;
int off;
off = compiler_next_instr(c, c->u->u_curblock);
if (off < 0)
return 0;
b = c->u->u_curblock;
i = &b->b_instr[off];
i->i_opcode = opcode;
i->i_hasarg = 0;
if (opcode == RETURN_VALUE)
b->b_return = 1;
compiler_set_lineno(c, off);
return 1;
}
static int
compiler_add_o(struct compiler *c, PyObject *dict, PyObject *o)
{
PyObject *t, *v;
Py_ssize_t arg;
unsigned char *p, *q;
Py_complex z;
double d;
int real_part_zero, imag_part_zero;
/* necessary to make sure types aren't coerced (e.g., int and long) */
/* _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms */
if (PyFloat_Check(o)) {
d = PyFloat_AS_DOUBLE(o);
p = (unsigned char*) &d;
/* all we need is to make the tuple different in either the 0.0
* or -0.0 case from all others, just to avoid the "coercion".
*/
if (*p==0 && p[sizeof(double)-1]==0)
t = PyTuple_Pack(3, o, o->ob_type, Py_None);
else
t = PyTuple_Pack(2, o, o->ob_type);
}
else if (PyComplex_Check(o)) {
/* complex case is even messier: we need to make complex(x,
0.) different from complex(x, -0.) and complex(0., y)
different from complex(-0., y), for any x and y. In
particular, all four complex zeros should be
distinguished.*/
z = PyComplex_AsCComplex(o);
p = (unsigned char*) &(z.real);
q = (unsigned char*) &(z.imag);
/* all that matters here is that on IEEE platforms
real_part_zero will be true if z.real == 0., and false if
z.real == -0. In fact, real_part_zero will also be true
for some other rarely occurring nonzero floats, but this
doesn't matter. Similar comments apply to
imag_part_zero. */
real_part_zero = *p==0 && p[sizeof(double)-1]==0;
imag_part_zero = *q==0 && q[sizeof(double)-1]==0;
if (real_part_zero && imag_part_zero) {
t = PyTuple_Pack(4, o, o->ob_type, Py_True, Py_True);
}
else if (real_part_zero && !imag_part_zero) {
t = PyTuple_Pack(4, o, o->ob_type, Py_True, Py_False);
}
else if (!real_part_zero && imag_part_zero) {
t = PyTuple_Pack(4, o, o->ob_type, Py_False, Py_True);
}
else {
t = PyTuple_Pack(2, o, o->ob_type);
}
}
else {
t = PyTuple_Pack(2, o, o->ob_type);
}
if (t == NULL)
return -1;
v = PyDict_GetItem(dict, t);
if (!v) {
arg = PyDict_Size(dict);
v = PyInt_FromLong(arg);
if (!v) {
Py_DECREF(t);
return -1;
}
if (PyDict_SetItem(dict, t, v) < 0) {
Py_DECREF(t);
Py_DECREF(v);
return -1;
}
Py_DECREF(v);
}
else
arg = PyInt_AsLong(v);
Py_DECREF(t);
return arg;
}
static int