1 /*
2 +----------------------------------------------------------------------+
3 | Zend OPcache |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1998-2015 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Andi Gutmans <andi@zend.com> |
16 | Zeev Suraski <zeev@zend.com> |
17 | Stanislav Malyshev <stas@zend.com> |
18 | Dmitry Stogov <dmitry@zend.com> |
19 +----------------------------------------------------------------------+
20 */
21
22 #include "php.h"
23 #include "Optimizer/zend_optimizer.h"
24 #include "Optimizer/zend_optimizer_internal.h"
25 #include "zend_API.h"
26 #include "zend_constants.h"
27 #include "zend_execute.h"
28
29 #define OPTIMIZATION_LEVEL \
30 ZCG(accel_directives).optimization_level
31
32 #if ZEND_EXTENSION_API_NO >= PHP_5_5_X_API_NO
zend_optimizer_lookup_cv(zend_op_array * op_array,char * name,int name_len)33 static int zend_optimizer_lookup_cv(zend_op_array *op_array, char* name, int name_len)
34 {
35 int i = 0;
36 ulong hash_value = zend_inline_hash_func(name, name_len+1);
37
38 while (i < op_array->last_var) {
39 if (op_array->vars[i].name == name ||
40 (op_array->vars[i].hash_value == hash_value &&
41 op_array->vars[i].name_len == name_len &&
42 memcmp(op_array->vars[i].name, name, name_len) == 0)) {
43 return i;
44 }
45 i++;
46 }
47 i = op_array->last_var;
48 op_array->last_var++;
49 op_array->vars = erealloc(op_array->vars, op_array->last_var * sizeof(zend_compiled_variable));
50 if (IS_INTERNED(name)) {
51 op_array->vars[i].name = name;
52 } else {
53 op_array->vars[i].name = estrndup(name, name_len);
54 }
55 op_array->vars[i].name_len = name_len;
56 op_array->vars[i].hash_value = hash_value;
57 return i;
58 }
59 #endif
60
61 #if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
zend_optimizer_add_literal(zend_op_array * op_array,const zval * zv TSRMLS_DC)62 int zend_optimizer_add_literal(zend_op_array *op_array, const zval *zv TSRMLS_DC)
63 {
64 int i = op_array->last_literal;
65 op_array->last_literal++;
66 if (i >= CG(context).literals_size) {
67 CG(context).literals_size += 16; /* FIXME */
68 op_array->literals = (zend_literal*)erealloc(op_array->literals, CG(context).literals_size * sizeof(zend_literal));
69 }
70 op_array->literals[i].constant = *zv;
71 op_array->literals[i].hash_value = 0;
72 op_array->literals[i].cache_slot = -1;
73 Z_SET_REFCOUNT(op_array->literals[i].constant, 2);
74 Z_SET_ISREF(op_array->literals[i].constant);
75 return i;
76 }
77
78 # define LITERAL_LONG(op, val) do { \
79 zval _c; \
80 ZVAL_LONG(&_c, val); \
81 op.constant = zend_optimizer_add_literal(op_array, &_c TSRMLS_CC); \
82 } while (0)
83
84 # define LITERAL_BOOL(op, val) do { \
85 zval _c; \
86 ZVAL_BOOL(&_c, val); \
87 op.constant = zend_optimizer_add_literal(op_array, &_c TSRMLS_CC); \
88 } while (0)
89
90 # define literal_dtor(zv) do { \
91 zval_dtor(zv); \
92 Z_TYPE_P(zv) = IS_NULL; \
93 } while (0)
94
95 #define COPY_NODE(target, src) do { \
96 target ## _type = src ## _type; \
97 target = src; \
98 } while (0)
99
100 #else
101
102 # define LITERAL_LONG(op, val) ZVAL_LONG(&op.u.constant, val)
103
104 # define LITERAL_BOOL(op, val) ZVAL_BOOL(&op.u.constant, val)
105
106 # define literal_dtor(zv) zval_dtor(zv)
107
108 #define COPY_NODE(target, src) do { \
109 target = src; \
110 } while (0)
111
112 #endif
113
update_op1_const(zend_op_array * op_array,zend_op * opline,zval * val TSRMLS_DC)114 static void update_op1_const(zend_op_array *op_array,
115 zend_op *opline,
116 zval *val TSRMLS_DC)
117 {
118 if (opline->opcode == ZEND_FREE) {
119 MAKE_NOP(opline);
120 zval_dtor(val);
121 } else {
122 ZEND_OP1_TYPE(opline) = IS_CONST;
123 #if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
124 if (Z_TYPE_P(val) == IS_STRING) {
125 switch (opline->opcode) {
126 case ZEND_INIT_STATIC_METHOD_CALL:
127 case ZEND_CATCH:
128 case ZEND_FETCH_CONSTANT:
129 opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
130 Z_HASH_P(&ZEND_OP1_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1);
131 op_array->literals[opline->op1.constant].cache_slot = op_array->last_cache_slot++;
132 zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
133 zend_optimizer_add_literal(op_array, val TSRMLS_CC);
134 op_array->literals[opline->op1.constant+1].hash_value = zend_hash_func(Z_STRVAL(op_array->literals[opline->op1.constant+1].constant), Z_STRLEN(op_array->literals[opline->op1.constant+1].constant) + 1);
135 break;
136 case ZEND_DO_FCALL:
137 zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
138 opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
139 Z_HASH_P(&ZEND_OP1_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1);
140 op_array->literals[opline->op1.constant].cache_slot = op_array->last_cache_slot++;
141 break;
142 default:
143 opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
144 Z_HASH_P(&ZEND_OP1_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1);
145 break;
146 }
147 } else {
148 opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
149 }
150 #else
151 ZEND_OP1_LITERAL(opline) = *val;
152 #endif
153 }
154 }
155
update_op2_const(zend_op_array * op_array,zend_op * opline,zval * val TSRMLS_DC)156 static void update_op2_const(zend_op_array *op_array,
157 zend_op *opline,
158 zval *val TSRMLS_DC)
159 {
160 ZEND_OP2_TYPE(opline) = IS_CONST;
161 #if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
162 opline->op2.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
163 if (Z_TYPE_P(val) == IS_STRING) {
164 Z_HASH_P(&ZEND_OP2_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)) + 1);
165 switch (opline->opcode) {
166 case ZEND_FETCH_R:
167 case ZEND_FETCH_W:
168 case ZEND_FETCH_RW:
169 case ZEND_FETCH_IS:
170 case ZEND_FETCH_UNSET:
171 case ZEND_FETCH_FUNC_ARG:
172 case ZEND_FETCH_CLASS:
173 case ZEND_INIT_FCALL_BY_NAME:
174 /*case ZEND_INIT_NS_FCALL_BY_NAME:*/
175 case ZEND_UNSET_VAR:
176 case ZEND_ISSET_ISEMPTY_VAR:
177 case ZEND_ADD_INTERFACE:
178 case ZEND_ADD_TRAIT:
179 op_array->literals[opline->op2.constant].cache_slot = op_array->last_cache_slot++;
180 zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
181 zend_optimizer_add_literal(op_array, val TSRMLS_CC);
182 op_array->literals[opline->op2.constant+1].hash_value = zend_hash_func(Z_STRVAL(op_array->literals[opline->op2.constant+1].constant), Z_STRLEN(op_array->literals[opline->op2.constant+1].constant) + 1);
183 break;
184 case ZEND_INIT_METHOD_CALL:
185 case ZEND_INIT_STATIC_METHOD_CALL:
186 zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
187 zend_optimizer_add_literal(op_array, val TSRMLS_CC);
188 op_array->literals[opline->op2.constant+1].hash_value = zend_hash_func(Z_STRVAL(op_array->literals[opline->op2.constant+1].constant), Z_STRLEN(op_array->literals[opline->op2.constant+1].constant) + 1);
189 /* break missing intentionally */
190 /*case ZEND_FETCH_CONSTANT:*/
191 case ZEND_ASSIGN_OBJ:
192 case ZEND_FETCH_OBJ_R:
193 case ZEND_FETCH_OBJ_W:
194 case ZEND_FETCH_OBJ_RW:
195 case ZEND_FETCH_OBJ_IS:
196 case ZEND_FETCH_OBJ_UNSET:
197 case ZEND_FETCH_OBJ_FUNC_ARG:
198 case ZEND_UNSET_OBJ:
199 case ZEND_PRE_INC_OBJ:
200 case ZEND_PRE_DEC_OBJ:
201 case ZEND_POST_INC_OBJ:
202 case ZEND_POST_DEC_OBJ:
203 case ZEND_ISSET_ISEMPTY_PROP_OBJ:
204 op_array->literals[opline->op2.constant].cache_slot = op_array->last_cache_slot;
205 op_array->last_cache_slot += 2;
206 break;
207 case ZEND_ASSIGN_ADD:
208 case ZEND_ASSIGN_SUB:
209 case ZEND_ASSIGN_MUL:
210 case ZEND_ASSIGN_DIV:
211 case ZEND_ASSIGN_MOD:
212 case ZEND_ASSIGN_SL:
213 case ZEND_ASSIGN_SR:
214 case ZEND_ASSIGN_CONCAT:
215 case ZEND_ASSIGN_BW_OR:
216 case ZEND_ASSIGN_BW_AND:
217 case ZEND_ASSIGN_BW_XOR:
218 if (opline->extended_value == ZEND_ASSIGN_OBJ) {
219 op_array->literals[opline->op2.constant].cache_slot = op_array->last_cache_slot;
220 op_array->last_cache_slot += 2;
221 }
222 break;
223 #if ZEND_EXTENSION_API_NO >= PHP_5_4_X_API_NO
224 case ZEND_OP_DATA:
225 if ((opline-1)->opcode == ZEND_ASSIGN_DIM ||
226 ((opline-1)->extended_value == ZEND_ASSIGN_DIM &&
227 ((opline-1)->opcode == ZEND_ASSIGN_ADD ||
228 (opline-1)->opcode == ZEND_ASSIGN_SUB ||
229 (opline-1)->opcode == ZEND_ASSIGN_MUL ||
230 (opline-1)->opcode == ZEND_ASSIGN_DIV ||
231 (opline-1)->opcode == ZEND_ASSIGN_MOD ||
232 (opline-1)->opcode == ZEND_ASSIGN_SL ||
233 (opline-1)->opcode == ZEND_ASSIGN_SR ||
234 (opline-1)->opcode == ZEND_ASSIGN_CONCAT ||
235 (opline-1)->opcode == ZEND_ASSIGN_BW_OR ||
236 (opline-1)->opcode == ZEND_ASSIGN_BW_AND ||
237 (opline-1)->opcode == ZEND_ASSIGN_BW_XOR))) {
238 goto check_numeric;
239 }
240 break;
241 case ZEND_ISSET_ISEMPTY_DIM_OBJ:
242 case ZEND_ADD_ARRAY_ELEMENT:
243 case ZEND_INIT_ARRAY:
244 case ZEND_ASSIGN_DIM:
245 case ZEND_UNSET_DIM:
246 case ZEND_FETCH_DIM_R:
247 case ZEND_FETCH_DIM_W:
248 case ZEND_FETCH_DIM_RW:
249 case ZEND_FETCH_DIM_IS:
250 case ZEND_FETCH_DIM_FUNC_ARG:
251 case ZEND_FETCH_DIM_UNSET:
252 case ZEND_FETCH_DIM_TMP_VAR:
253 check_numeric:
254 {
255 ulong index;
256 int numeric = 0;
257
258 ZEND_HANDLE_NUMERIC_EX(Z_STRVAL_P(val), Z_STRLEN_P(val)+1, index, numeric = 1);
259 if (numeric) {
260 zval_dtor(val);
261 ZVAL_LONG(val, index);
262 op_array->literals[opline->op2.constant].constant = *val;
263 }
264 }
265 break;
266 #endif
267 default:
268 break;
269 }
270 }
271 #else
272 ZEND_OP2_LITERAL(opline) = *val;
273 #endif
274 }
275
replace_tmp_by_const(zend_op_array * op_array,zend_op * opline,zend_uint var,zval * val TSRMLS_DC)276 static void replace_tmp_by_const(zend_op_array *op_array,
277 zend_op *opline,
278 zend_uint var,
279 zval *val
280 TSRMLS_DC)
281 {
282 zend_op *end = op_array->opcodes + op_array->last;
283
284 while (opline < end) {
285 if (ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
286 ZEND_OP1(opline).var == var) {
287
288 /* In most cases IS_TMP_VAR operand may be used only once.
289 * The operands are usually destroyed by the opcode handler.
290 * ZEND_CASE is an exception, that keeps operand unchanged,
291 * and allows its reuse. The number of ZEND_CASE instructions
292 * usually terminated by ZEND_FREE that finally kills the value.
293 */
294 if (opline->opcode == ZEND_CASE || opline->opcode == ZEND_FREE) {
295 zend_op *m, *n;
296 int brk = op_array->last_brk_cont;
297 zend_bool in_switch = 0;
298 while (brk--) {
299 if (op_array->brk_cont_array[brk].start <= (opline - op_array->opcodes) &&
300 op_array->brk_cont_array[brk].brk > (opline - op_array->opcodes)) {
301 in_switch = 1;
302 break;
303 }
304 }
305
306 if (!in_switch) {
307 MAKE_NOP(opline);
308 zval_dtor(val);
309 break;
310 }
311
312 m = opline;
313 n = op_array->opcodes + op_array->brk_cont_array[brk].brk + 1;
314 while (m < n) {
315 if (ZEND_OP1_TYPE(m) == IS_TMP_VAR &&
316 ZEND_OP1(m).var == var) {
317 if (m->opcode == ZEND_CASE) {
318 zval old_val;
319 old_val = *val;
320 zval_copy_ctor(val);
321 update_op1_const(op_array, m, val TSRMLS_CC);
322 *val = old_val;
323 } else if (m->opcode == ZEND_FREE) {
324 MAKE_NOP(m);
325 } else {
326 ZEND_ASSERT(0);
327 }
328 }
329 m++;
330 }
331 zval_dtor(val);
332 break;
333 } else {
334 update_op1_const(op_array, opline, val TSRMLS_CC);
335 break;
336 }
337 }
338
339 if (ZEND_OP2_TYPE(opline) == IS_TMP_VAR &&
340 ZEND_OP2(opline).var == var) {
341
342 update_op2_const(op_array, opline, val TSRMLS_CC);
343 /* TMP_VAR may be used only once */
344 break;
345 }
346 opline++;
347 }
348 }
349
350 #include "Optimizer/nop_removal.c"
351 #include "Optimizer/block_pass.c"
352 #include "Optimizer/optimize_temp_vars_5.c"
353
zend_optimizer(zend_op_array * op_array TSRMLS_DC)354 void zend_optimizer(zend_op_array *op_array TSRMLS_DC)
355 {
356 if (op_array->type == ZEND_EVAL_CODE ||
357 (op_array->fn_flags & ZEND_ACC_INTERACTIVE)) {
358 return;
359 }
360
361 /* pass 1
362 * - substitute persistent constants (true, false, null, etc)
363 * - perform compile-time evaluation of constant binary and unary operations
364 * - optimize series of ADD_STRING and/or ADD_CHAR
365 * - convert CAST(IS_BOOL,x) into BOOL(x)
366 * - convert INTI_FCALL_BY_NAME + DO_FCALL_BY_NAME into DO_FCALL
367 */
368 #include "Optimizer/pass1_5.c"
369
370 /* pass 2:
371 * - convert non-numeric constants to numeric constants in numeric operators
372 * - optimize constant conditional JMPs
373 * - optimize static BRKs and CONTs
374 */
375 #include "Optimizer/pass2.c"
376
377 /* pass 3:
378 * - optimize $i = $i+expr to $i+=expr
379 * - optimize series of JMPs
380 * - change $i++ to ++$i where possible
381 */
382 #include "Optimizer/pass3.c"
383
384 /* pass 5:
385 * - CFG optimization
386 */
387 #include "Optimizer/pass5.c"
388
389 /* pass 9:
390 * - Optimize temp variables usage
391 */
392 #include "Optimizer/pass9.c"
393
394 /* pass 10:
395 * - remove NOPs
396 */
397 #include "Optimizer/pass10.c"
398 }
399