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
|
/*
+----------------------------------------------------------------------+
| Zend Engine, DFG - Data Flow Graph |
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "zend_compile.h"
#include "zend_dfg.h"
static zend_always_inline void _zend_dfg_add_use_def_op(const zend_op_array *op_array, const zend_op *opline, uint32_t build_flags, zend_bitset use, zend_bitset def) /* {{{ */
{
uint32_t var_num;
const zend_op *next;
if (opline->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(opline->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
}
if (((opline->op2_type & (IS_VAR|IS_TMP_VAR)) != 0
&& opline->opcode != ZEND_FE_FETCH_R
&& opline->opcode != ZEND_FE_FETCH_RW)
|| (opline->op2_type == IS_CV)) {
var_num = EX_VAR_TO_NUM(opline->op2.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
}
if ((build_flags & ZEND_SSA_USE_CV_RESULTS)
&& opline->result_type == IS_CV
&& opline->opcode != ZEND_RECV) {
var_num = EX_VAR_TO_NUM(opline->result.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
}
switch (opline->opcode) {
case ZEND_ASSIGN:
if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op2_type == IS_CV) {
zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
}
if (opline->op1_type == IS_CV) {
add_op1_def:
zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op1.var));
}
break;
case ZEND_ASSIGN_REF:
if (opline->op2_type == IS_CV) {
zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
}
if (opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_ASSIGN_DIM:
case ZEND_ASSIGN_OBJ:
next = opline + 1;
if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(next->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
if (build_flags & ZEND_SSA_RC_INFERENCE && next->op1_type == IS_CV) {
zend_bitset_incl(def, var_num);
}
}
if (opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_ASSIGN_OBJ_REF:
next = opline + 1;
if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(next->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
if (next->op1_type == IS_CV) {
zend_bitset_incl(def, var_num);
}
}
if (opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_ASSIGN_STATIC_PROP:
next = opline + 1;
if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(next->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
if ((build_flags & ZEND_SSA_RC_INFERENCE) && next->op1_type == IS_CV) {
zend_bitset_incl(def, var_num);
}
}
break;
case ZEND_ASSIGN_STATIC_PROP_REF:
next = opline + 1;
if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(next->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
if (next->op1_type == IS_CV) {
zend_bitset_incl(def, var_num);
}
}
break;
case ZEND_ASSIGN_STATIC_PROP_OP:
next = opline + 1;
if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(next->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
}
break;
case ZEND_ASSIGN_DIM_OP:
case ZEND_ASSIGN_OBJ_OP:
next = opline + 1;
if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
var_num = EX_VAR_TO_NUM(next->op1.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
}
if (opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_ASSIGN_OP:
case ZEND_PRE_INC:
case ZEND_PRE_DEC:
case ZEND_POST_INC:
case ZEND_POST_DEC:
case ZEND_BIND_GLOBAL:
case ZEND_BIND_STATIC:
case ZEND_SEND_VAR_NO_REF:
case ZEND_SEND_VAR_NO_REF_EX:
case ZEND_SEND_VAR_EX:
case ZEND_SEND_FUNC_ARG:
case ZEND_SEND_REF:
case ZEND_SEND_UNPACK:
case ZEND_FE_RESET_RW:
case ZEND_MAKE_REF:
case ZEND_PRE_INC_OBJ:
case ZEND_PRE_DEC_OBJ:
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
case ZEND_UNSET_DIM:
case ZEND_UNSET_OBJ:
case ZEND_FETCH_DIM_W:
case ZEND_FETCH_DIM_RW:
case ZEND_FETCH_DIM_FUNC_ARG:
case ZEND_FETCH_DIM_UNSET:
case ZEND_FETCH_LIST_W:
if (opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_SEND_VAR:
case ZEND_CAST:
case ZEND_QM_ASSIGN:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_FE_RESET_R:
if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_ADD_ARRAY_UNPACK:
var_num = EX_VAR_TO_NUM(opline->result.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
break;
case ZEND_ADD_ARRAY_ELEMENT:
var_num = EX_VAR_TO_NUM(opline->result.var);
if (!zend_bitset_in(def, var_num)) {
zend_bitset_incl(use, var_num);
}
/* break missing intentionally */
case ZEND_INIT_ARRAY:
if (((build_flags & ZEND_SSA_RC_INFERENCE)
|| (opline->extended_value & ZEND_ARRAY_ELEMENT_REF))
&& opline->op1_type == IS_CV) {
goto add_op1_def;
}
break;
case ZEND_YIELD:
if (opline->op1_type == IS_CV
&& ((op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)
|| (build_flags & ZEND_SSA_RC_INFERENCE))) {
goto add_op1_def;
}
break;
case ZEND_UNSET_CV:
goto add_op1_def;
case ZEND_VERIFY_RETURN_TYPE:
if (opline->op1_type & (IS_TMP_VAR|IS_VAR|IS_CV)) {
goto add_op1_def;
}
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
#if 0
/* This special case was handled above the switch */
if (opline->op2_type != IS_CV) {
op2_use = -1; /* not used */
}
#endif
zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
break;
case ZEND_BIND_LEXICAL:
if ((opline->extended_value & ZEND_BIND_REF) || (build_flags & ZEND_SSA_RC_INFERENCE)) {
zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
}
break;
default:
break;
}
if (opline->result_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
zend_bitset_incl(def, EX_VAR_TO_NUM(opline->result.var));
}
}
/* }}} */
ZEND_API void zend_dfg_add_use_def_op(const zend_op_array *op_array, const zend_op *opline, uint32_t build_flags, zend_bitset use, zend_bitset def) /* {{{ */
{
_zend_dfg_add_use_def_op(op_array, opline, build_flags, use, def);
}
/* }}} */
int zend_build_dfg(const zend_op_array *op_array, const zend_cfg *cfg, zend_dfg *dfg, uint32_t build_flags) /* {{{ */
{
int set_size;
zend_basic_block *blocks = cfg->blocks;
int blocks_count = cfg->blocks_count;
zend_bitset tmp, def, use, in, out;
int k;
int j;
set_size = dfg->size;
tmp = dfg->tmp;
def = dfg->def;
use = dfg->use;
in = dfg->in;
out = dfg->out;
/* Collect "def" and "use" sets */
for (j = 0; j < blocks_count; j++) {
zend_op *opline, *end;
zend_bitset b_use, b_def;
if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
continue;
}
opline = op_array->opcodes + blocks[j].start;
end = opline + blocks[j].len;
b_use = DFG_BITSET(use, set_size, j);
b_def = DFG_BITSET(def, set_size, j);
for (; opline < end; opline++) {
if (opline->opcode != ZEND_OP_DATA) {
_zend_dfg_add_use_def_op(op_array, opline, build_flags, b_use, b_def);
}
}
}
/* Calculate "in" and "out" sets */
{
uint32_t worklist_len = zend_bitset_len(blocks_count);
zend_bitset worklist;
ALLOCA_FLAG(use_heap);
worklist = ZEND_BITSET_ALLOCA(worklist_len, use_heap);
memset(worklist, 0, worklist_len * ZEND_BITSET_ELM_SIZE);
for (j = 0; j < blocks_count; j++) {
zend_bitset_incl(worklist, j);
}
while (!zend_bitset_empty(worklist, worklist_len)) {
/* We use the last block on the worklist, because predecessors tend to be located
* before the succeeding block, so this converges faster. */
j = zend_bitset_last(worklist, worklist_len);
zend_bitset_excl(worklist, j);
if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
continue;
}
if (blocks[j].successors_count != 0) {
zend_bitset_copy(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[0]), set_size);
for (k = 1; k < blocks[j].successors_count; k++) {
zend_bitset_union(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[k]), set_size);
}
} else {
zend_bitset_clear(DFG_BITSET(out, set_size, j), set_size);
}
zend_bitset_union_with_difference(tmp, DFG_BITSET(use, set_size, j), DFG_BITSET(out, set_size, j), DFG_BITSET(def, set_size, j), set_size);
if (!zend_bitset_equal(DFG_BITSET(in, set_size, j), tmp, set_size)) {
zend_bitset_copy(DFG_BITSET(in, set_size, j), tmp, set_size);
/* Add predecessors of changed block to worklist */
{
int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
for (k = 0; k < blocks[j].predecessors_count; k++) {
zend_bitset_incl(worklist, predecessors[k]);
}
}
}
}
free_alloca(worklist, use_heap);
}
return SUCCESS;
}
/* }}} */
|
