1 /*
2 +----------------------------------------------------------------------+
3 | Zend OPcache |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 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 | https://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@php.net> |
16 | Zeev Suraski <zeev@php.net> |
17 | Stanislav Malyshev <stas@zend.com> |
18 | Dmitry Stogov <dmitry@php.net> |
19 +----------------------------------------------------------------------+
20 */
21
22 #include "zend_API.h"
23 #include "zend_constants.h"
24 #include "zend_inheritance.h"
25 #include "zend_accelerator_util_funcs.h"
26 #include "zend_persist.h"
27 #include "zend_shared_alloc.h"
28 #include "zend_observer.h"
29
30 #ifdef __SSE2__
31 /* For SSE2 adler32 */
32 #include <immintrin.h>
33 #endif
34
35 typedef int (*id_function_t)(void *, void *);
36 typedef void (*unique_copy_ctor_func_t)(void *pElement);
37
create_persistent_script(void)38 zend_persistent_script* create_persistent_script(void)
39 {
40 zend_persistent_script *persistent_script = (zend_persistent_script *) emalloc(sizeof(zend_persistent_script));
41 memset(persistent_script, 0, sizeof(zend_persistent_script));
42
43 zend_hash_init(&persistent_script->script.function_table, 0, NULL, ZEND_FUNCTION_DTOR, 0);
44 /* class_table is usually destroyed by free_persistent_script() that
45 * overrides destructor. ZEND_CLASS_DTOR may be used by standard
46 * PHP compiler
47 */
48 zend_hash_init(&persistent_script->script.class_table, 0, NULL, ZEND_CLASS_DTOR, 0);
49
50 return persistent_script;
51 }
52
free_persistent_script(zend_persistent_script * persistent_script,int destroy_elements)53 void free_persistent_script(zend_persistent_script *persistent_script, int destroy_elements)
54 {
55 if (!destroy_elements) {
56 /* Both the keys and values have been transferred into the global tables.
57 * Set nNumUsed=0 to only deallocate the table, but not destroy any elements. */
58 persistent_script->script.function_table.nNumUsed = 0;
59 persistent_script->script.class_table.nNumUsed = 0;
60 } else {
61 destroy_op_array(&persistent_script->script.main_op_array);
62 }
63
64 zend_hash_destroy(&persistent_script->script.function_table);
65 zend_hash_destroy(&persistent_script->script.class_table);
66
67 if (persistent_script->script.filename) {
68 zend_string_release_ex(persistent_script->script.filename, 0);
69 }
70
71 if (persistent_script->warnings) {
72 for (uint32_t i = 0; i < persistent_script->num_warnings; i++) {
73 zend_error_info *info = persistent_script->warnings[i];
74 zend_string_release(info->filename);
75 zend_string_release(info->message);
76 efree(info);
77 }
78 efree(persistent_script->warnings);
79 }
80
81 zend_accel_free_delayed_early_binding_list(persistent_script);
82
83 efree(persistent_script);
84 }
85
zend_accel_move_user_functions(HashTable * src,uint32_t count,zend_script * script)86 void zend_accel_move_user_functions(HashTable *src, uint32_t count, zend_script *script)
87 {
88 Bucket *p, *end;
89 HashTable *dst;
90 zend_string *filename;
91 dtor_func_t orig_dtor;
92 zend_function *function;
93
94 if (!count) {
95 return;
96 }
97
98 dst = &script->function_table;
99 filename = script->main_op_array.filename;
100 orig_dtor = src->pDestructor;
101 src->pDestructor = NULL;
102 zend_hash_extend(dst, count, 0);
103 end = src->arData + src->nNumUsed;
104 p = end - count;
105 for (; p != end; p++) {
106 if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
107 function = Z_PTR(p->val);
108 if (EXPECTED(function->type == ZEND_USER_FUNCTION)
109 && EXPECTED(function->op_array.filename == filename)) {
110 _zend_hash_append_ptr(dst, p->key, function);
111 zend_hash_del_bucket(src, p);
112 }
113 }
114 src->pDestructor = orig_dtor;
115 }
116
zend_accel_move_user_classes(HashTable * src,uint32_t count,zend_script * script)117 void zend_accel_move_user_classes(HashTable *src, uint32_t count, zend_script *script)
118 {
119 Bucket *p, *end;
120 HashTable *dst;
121 zend_string *filename;
122 dtor_func_t orig_dtor;
123 zend_class_entry *ce;
124
125 if (!count) {
126 return;
127 }
128
129 dst = &script->class_table;
130 filename = script->main_op_array.filename;
131 orig_dtor = src->pDestructor;
132 src->pDestructor = NULL;
133 zend_hash_extend(dst, count, 0);
134 end = src->arData + src->nNumUsed;
135 p = end - count;
136 for (; p != end; p++) {
137 if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
138 ce = Z_PTR(p->val);
139 if (EXPECTED(ce->type == ZEND_USER_CLASS)
140 && EXPECTED(ce->info.user.filename == filename)) {
141 _zend_hash_append_ptr(dst, p->key, ce);
142 zend_hash_del_bucket(src, p);
143 }
144 }
145 src->pDestructor = orig_dtor;
146 }
147
_zend_accel_function_hash_copy(HashTable * target,HashTable * source,bool call_observers)148 static zend_always_inline void _zend_accel_function_hash_copy(HashTable *target, HashTable *source, bool call_observers)
149 {
150 zend_function *function1, *function2;
151 Bucket *p, *end;
152 zval *t;
153
154 zend_hash_extend(target, target->nNumUsed + source->nNumUsed, 0);
155 p = source->arData;
156 end = p + source->nNumUsed;
157 for (; p != end; p++) {
158 ZEND_ASSERT(Z_TYPE(p->val) != IS_UNDEF);
159 ZEND_ASSERT(p->key);
160 t = zend_hash_find_known_hash(target, p->key);
161 if (UNEXPECTED(t != NULL)) {
162 goto failure;
163 }
164 _zend_hash_append_ptr_ex(target, p->key, Z_PTR(p->val), 1);
165 if (UNEXPECTED(call_observers) && *ZSTR_VAL(p->key)) { // if not rtd key
166 _zend_observer_function_declared_notify(Z_PTR(p->val), p->key);
167 }
168 }
169 target->nInternalPointer = 0;
170
171 return;
172
173 failure:
174 function1 = Z_PTR(p->val);
175 function2 = Z_PTR_P(t);
176 CG(in_compilation) = 1;
177 zend_set_compiled_filename(function1->op_array.filename);
178 CG(zend_lineno) = function1->op_array.opcodes[0].lineno;
179 if (function2->type == ZEND_USER_FUNCTION
180 && function2->op_array.last > 0) {
181 zend_error_noreturn(E_ERROR, "Cannot redeclare function %s() (previously declared in %s:%d)",
182 ZSTR_VAL(function1->common.function_name),
183 ZSTR_VAL(function2->op_array.filename),
184 (int)function2->op_array.opcodes[0].lineno);
185 } else {
186 zend_error_noreturn(E_ERROR, "Cannot redeclare function %s()", ZSTR_VAL(function1->common.function_name));
187 }
188 }
189
zend_accel_function_hash_copy(HashTable * target,HashTable * source)190 static zend_always_inline void zend_accel_function_hash_copy(HashTable *target, HashTable *source)
191 {
192 _zend_accel_function_hash_copy(target, source, 0);
193 }
194
zend_accel_function_hash_copy_notify(HashTable * target,HashTable * source)195 static zend_never_inline void zend_accel_function_hash_copy_notify(HashTable *target, HashTable *source)
196 {
197 _zend_accel_function_hash_copy(target, source, 1);
198 }
199
_zend_accel_class_hash_copy(HashTable * target,HashTable * source,bool call_observers)200 static zend_always_inline void _zend_accel_class_hash_copy(HashTable *target, HashTable *source, bool call_observers)
201 {
202 Bucket *p, *end;
203 zval *t;
204
205 zend_hash_extend(target, target->nNumUsed + source->nNumUsed, 0);
206 p = source->arData;
207 end = p + source->nNumUsed;
208 for (; p != end; p++) {
209 ZEND_ASSERT(Z_TYPE(p->val) != IS_UNDEF);
210 ZEND_ASSERT(p->key);
211 t = zend_hash_find_known_hash(target, p->key);
212 if (UNEXPECTED(t != NULL)) {
213 if (EXPECTED(ZSTR_LEN(p->key) > 0) && EXPECTED(ZSTR_VAL(p->key)[0] == 0)) {
214 /* Runtime definition key. There are two circumstances under which the key can
215 * already be defined:
216 * 1. The file has been re-included without being changed in the meantime. In
217 * this case we can keep the old value, because we know that the definition
218 * hasn't changed.
219 * 2. The file has been changed in the meantime, but the RTD key ends up colliding.
220 * This would be a bug.
221 * As we can't distinguish these cases, we assume that it is 1. and keep the old
222 * value. */
223 continue;
224 } else if (UNEXPECTED(!ZCG(accel_directives).ignore_dups)) {
225 zend_class_entry *ce1 = Z_PTR(p->val);
226 if (!(ce1->ce_flags & ZEND_ACC_ANON_CLASS)) {
227 CG(in_compilation) = 1;
228 zend_set_compiled_filename(ce1->info.user.filename);
229 CG(zend_lineno) = ce1->info.user.line_start;
230 zend_class_redeclaration_error(E_ERROR, Z_PTR_P(t));
231 return;
232 }
233 continue;
234 }
235 } else {
236 zend_class_entry *ce = Z_PTR(p->val);
237 _zend_hash_append_ptr_ex(target, p->key, Z_PTR(p->val), 1);
238 if ((ce->ce_flags & ZEND_ACC_LINKED) && ZSTR_VAL(p->key)[0]) {
239 if (ZSTR_HAS_CE_CACHE(ce->name)) {
240 ZSTR_SET_CE_CACHE_EX(ce->name, ce, 0);
241 }
242 if (UNEXPECTED(call_observers)) {
243 _zend_observer_class_linked_notify(ce, p->key);
244 }
245 }
246 }
247 }
248 target->nInternalPointer = 0;
249 }
250
zend_accel_class_hash_copy(HashTable * target,HashTable * source)251 static zend_always_inline void zend_accel_class_hash_copy(HashTable *target, HashTable *source)
252 {
253 _zend_accel_class_hash_copy(target, source, 0);
254 }
255
zend_accel_class_hash_copy_notify(HashTable * target,HashTable * source)256 static zend_never_inline void zend_accel_class_hash_copy_notify(HashTable *target, HashTable *source)
257 {
258 _zend_accel_class_hash_copy(target, source, 1);
259 }
260
zend_accel_build_delayed_early_binding_list(zend_persistent_script * persistent_script)261 void zend_accel_build_delayed_early_binding_list(zend_persistent_script *persistent_script)
262 {
263 zend_op_array *op_array = &persistent_script->script.main_op_array;
264 if (!(op_array->fn_flags & ZEND_ACC_EARLY_BINDING)) {
265 return;
266 }
267
268 zend_op *end = op_array->opcodes + op_array->last;
269 for (zend_op *opline = op_array->opcodes; opline < end; opline++) {
270 if (opline->opcode == ZEND_DECLARE_CLASS_DELAYED) {
271 persistent_script->num_early_bindings++;
272 }
273 }
274
275 zend_early_binding *early_binding = persistent_script->early_bindings =
276 emalloc(sizeof(zend_early_binding) * persistent_script->num_early_bindings);
277
278 for (zend_op *opline = op_array->opcodes; opline < end; opline++) {
279 if (opline->opcode == ZEND_DECLARE_CLASS_DELAYED) {
280 zval *lcname = RT_CONSTANT(opline, opline->op1);
281 early_binding->lcname = zend_string_copy(Z_STR_P(lcname));
282 early_binding->rtd_key = zend_string_copy(Z_STR_P(lcname + 1));
283 early_binding->lc_parent_name =
284 zend_string_copy(Z_STR_P(RT_CONSTANT(opline, opline->op2)));
285 early_binding->cache_slot = (uint32_t) -1;
286 early_binding++;
287 }
288 }
289 }
290
zend_accel_finalize_delayed_early_binding_list(zend_persistent_script * persistent_script)291 void zend_accel_finalize_delayed_early_binding_list(zend_persistent_script *persistent_script)
292 {
293 if (!persistent_script->num_early_bindings) {
294 return;
295 }
296
297 zend_early_binding *early_binding = persistent_script->early_bindings;
298 zend_early_binding *early_binding_end = early_binding + persistent_script->num_early_bindings;
299 zend_op_array *op_array = &persistent_script->script.main_op_array;
300 zend_op *opline_end = op_array->opcodes + op_array->last;
301 for (zend_op *opline = op_array->opcodes; opline < opline_end; opline++) {
302 if (opline->opcode == ZEND_DECLARE_CLASS_DELAYED) {
303 zend_string *rtd_key = Z_STR_P(RT_CONSTANT(opline, opline->op1) + 1);
304 /* Skip early_binding entries that don't match, maybe their DECLARE_CLASS_DELAYED
305 * was optimized away. */
306 while (!zend_string_equals(early_binding->rtd_key, rtd_key)) {
307 early_binding++;
308 if (early_binding >= early_binding_end) {
309 return;
310 }
311 }
312
313 early_binding->cache_slot = opline->extended_value;
314 early_binding++;
315 if (early_binding >= early_binding_end) {
316 return;
317 }
318 }
319 }
320 }
321
zend_accel_free_delayed_early_binding_list(zend_persistent_script * persistent_script)322 void zend_accel_free_delayed_early_binding_list(zend_persistent_script *persistent_script)
323 {
324 if (persistent_script->num_early_bindings) {
325 for (uint32_t i = 0; i < persistent_script->num_early_bindings; i++) {
326 zend_early_binding *early_binding = &persistent_script->early_bindings[i];
327 zend_string_release(early_binding->lcname);
328 zend_string_release(early_binding->rtd_key);
329 zend_string_release(early_binding->lc_parent_name);
330 }
331 efree(persistent_script->early_bindings);
332 persistent_script->early_bindings = NULL;
333 persistent_script->num_early_bindings = 0;
334 }
335 }
336
zend_accel_do_delayed_early_binding(zend_persistent_script * persistent_script,zend_op_array * op_array)337 static void zend_accel_do_delayed_early_binding(
338 zend_persistent_script *persistent_script, zend_op_array *op_array)
339 {
340 ZEND_ASSERT(!ZEND_MAP_PTR(op_array->run_time_cache));
341 ZEND_ASSERT(op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE);
342 void *run_time_cache = emalloc(op_array->cache_size);
343
344 ZEND_MAP_PTR_INIT(op_array->run_time_cache, run_time_cache);
345 memset(run_time_cache, 0, op_array->cache_size);
346
347 zend_string *orig_compiled_filename = CG(compiled_filename);
348 bool orig_in_compilation = CG(in_compilation);
349 CG(compiled_filename) = persistent_script->script.filename;
350 CG(in_compilation) = 1;
351 for (uint32_t i = 0; i < persistent_script->num_early_bindings; i++) {
352 zend_early_binding *early_binding = &persistent_script->early_bindings[i];
353 zend_class_entry *ce = zend_hash_find_ex_ptr(EG(class_table), early_binding->lcname, 1);
354 if (!ce) {
355 zval *zv = zend_hash_find_known_hash(EG(class_table), early_binding->rtd_key);
356 if (zv) {
357 zend_class_entry *orig_ce = Z_CE_P(zv);
358 zend_class_entry *parent_ce = !(orig_ce->ce_flags & ZEND_ACC_LINKED)
359 ? zend_hash_find_ex_ptr(EG(class_table), early_binding->lc_parent_name, 1)
360 : NULL;
361 if (parent_ce || (orig_ce->ce_flags & ZEND_ACC_LINKED)) {
362 ce = zend_try_early_bind(orig_ce, parent_ce, early_binding->lcname, zv);
363 }
364 }
365 if (ce && early_binding->cache_slot != (uint32_t) -1) {
366 *(void**)((char*)run_time_cache + early_binding->cache_slot) = ce;
367 }
368 }
369 }
370 CG(compiled_filename) = orig_compiled_filename;
371 CG(in_compilation) = orig_in_compilation;
372 }
373
zend_accel_load_script(zend_persistent_script * persistent_script,int from_shared_memory)374 zend_op_array* zend_accel_load_script(zend_persistent_script *persistent_script, int from_shared_memory)
375 {
376 zend_op_array *op_array;
377
378 op_array = (zend_op_array *) emalloc(sizeof(zend_op_array));
379 *op_array = persistent_script->script.main_op_array;
380
381 if (EXPECTED(from_shared_memory)) {
382 if (ZCSG(map_ptr_last) > CG(map_ptr_last)) {
383 zend_map_ptr_extend(ZCSG(map_ptr_last));
384 }
385
386 /* Register __COMPILER_HALT_OFFSET__ constant */
387 if (persistent_script->compiler_halt_offset != 0 &&
388 persistent_script->script.filename) {
389 zend_string *name;
390 static const char haltoff[] = "__COMPILER_HALT_OFFSET__";
391
392 name = zend_mangle_property_name(haltoff, sizeof(haltoff) - 1, ZSTR_VAL(persistent_script->script.filename), ZSTR_LEN(persistent_script->script.filename), 0);
393 if (!zend_hash_exists(EG(zend_constants), name)) {
394 zend_register_long_constant(ZSTR_VAL(name), ZSTR_LEN(name), persistent_script->compiler_halt_offset, 0, 0);
395 }
396 zend_string_release_ex(name, 0);
397 }
398 }
399
400 if (zend_hash_num_elements(&persistent_script->script.function_table) > 0) {
401 if (EXPECTED(!zend_observer_function_declared_observed)) {
402 zend_accel_function_hash_copy(CG(function_table), &persistent_script->script.function_table);
403 } else {
404 zend_accel_function_hash_copy_notify(CG(function_table), &persistent_script->script.function_table);
405 }
406 }
407
408 if (zend_hash_num_elements(&persistent_script->script.class_table) > 0) {
409 if (EXPECTED(!zend_observer_class_linked_observed)) {
410 zend_accel_class_hash_copy(CG(class_table), &persistent_script->script.class_table);
411 } else {
412 zend_accel_class_hash_copy_notify(CG(class_table), &persistent_script->script.class_table);
413 }
414 }
415
416 if (persistent_script->num_early_bindings) {
417 zend_accel_do_delayed_early_binding(persistent_script, op_array);
418 }
419
420 if (UNEXPECTED(!from_shared_memory)) {
421 free_persistent_script(persistent_script, 0); /* free only hashes */
422 }
423
424 return op_array;
425 }
426
427 /*
428 * zend_adler32() is based on zlib implementation
429 * Computes the Adler-32 checksum of a data stream
430 *
431 * Copyright (C) 1995-2005 Mark Adler
432 * For conditions of distribution and use, see copyright notice in zlib.h
433 *
434 * Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
435 *
436 * This software is provided 'as-is', without any express or implied
437 * warranty. In no event will the authors be held liable for any damages
438 * arising from the use of this software.
439 *
440 * Permission is granted to anyone to use this software for any purpose,
441 * including commercial applications, and to alter it and redistribute it
442 * freely, subject to the following restrictions:
443 *
444 * 1. The origin of this software must not be misrepresented; you must not
445 * claim that you wrote the original software. If you use this software
446 * in a product, an acknowledgment in the product documentation would be
447 * appreciated but is not required.
448 * 2. Altered source versions must be plainly marked as such, and must not be
449 * misrepresented as being the original software.
450 * 3. This notice may not be removed or altered from any source distribution.
451 *
452 */
453
454 #define ADLER32_BASE 65521 /* largest prime smaller than 65536 */
455 #define ADLER32_NMAX 5552
456 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
457
458 #define ADLER32_SCALAR_DO1(buf) {s1 += *(buf); s2 += s1;}
459 #define ADLER32_SCALAR_DO2(buf, i) ADLER32_SCALAR_DO1(buf + i); ADLER32_SCALAR_DO1(buf + i + 1);
460 #define ADLER32_SCALAR_DO4(buf, i) ADLER32_SCALAR_DO2(buf, i); ADLER32_SCALAR_DO2(buf, i + 2);
461 #define ADLER32_SCALAR_DO8(buf, i) ADLER32_SCALAR_DO4(buf, i); ADLER32_SCALAR_DO4(buf, i + 4);
462 #define ADLER32_SCALAR_DO16(buf) ADLER32_SCALAR_DO8(buf, 0); ADLER32_SCALAR_DO8(buf, 8);
463
adler32_do16_loop(unsigned char * buf,unsigned char * end,unsigned int * s1_out,unsigned int * s2_out)464 static zend_always_inline void adler32_do16_loop(unsigned char *buf, unsigned char *end, unsigned int *s1_out, unsigned int *s2_out)
465 {
466 unsigned int s1 = *s1_out;
467 unsigned int s2 = *s2_out;
468
469 #ifdef __SSE2__
470 const __m128i zero = _mm_setzero_si128();
471
472 __m128i accumulate_s2 = zero;
473 unsigned int accumulate_s1 = 0;
474
475 do {
476 __m128i read = _mm_loadu_si128((__m128i *) buf); /* [A:P] */
477
478 /* Split the 8-bit-element vector into two 16-bit-element vectors where each element gets zero-extended from 8-bits to 16-bits */
479 __m128i lower = _mm_unpacklo_epi8(read, zero); /* [A:H] zero-extended to 16-bits */
480 __m128i higher = _mm_unpackhi_epi8(read, zero); /* [I:P] zero-extended to 16-bits */
481 lower = _mm_madd_epi16(lower, _mm_set_epi16(9, 10, 11, 12, 13, 14, 15, 16)); /* [A * 16:H * 9] */
482 higher = _mm_madd_epi16(higher, _mm_set_epi16(1, 2, 3, 4, 5, 6, 7, 8)); /* [I * 8:P * 1] */
483
484 /* We'll cheat here: it's difficult to add 16-bit elementwise, but we can do 32-bit additions.
485 * The highest value the sum of two elements of the vectors can take is 0xff * 16 + 0xff * 8 < 0xffff.
486 * That means there is no carry possible from 16->17 bits so the 32-bit addition is safe. */
487 __m128i sum = _mm_add_epi32(lower, higher); /* [A * 16 + I * 8:H * 9 + P * 1] */
488 accumulate_s2 = _mm_add_epi32(accumulate_s2, sum);
489 accumulate_s1 += s1;
490
491 /* Computes 8-bit element-wise abs(buf - zero) and then sums the elements into two 16 bit parts */
492 sum = _mm_sad_epu8(read, zero);
493 s1 += _mm_cvtsi128_si32(sum) + _mm_extract_epi16(sum, 4);
494
495 buf += 16;
496 } while (buf != end);
497
498 /* For convenience, let's do a rename of variables and let accumulate_s2 = [X, Y, Z, W] */
499 __m128i shuffled = _mm_shuffle_epi32(accumulate_s2, _MM_SHUFFLE(1, 0, 0, 2)); /* [Y, X, X, Z] */
500 accumulate_s2 = _mm_add_epi32(accumulate_s2, shuffled); /* [X + Y, Y + X, Z + X, W + Z] */
501 shuffled = _mm_shuffle_epi32(accumulate_s2, _MM_SHUFFLE(3, 3, 3, 3)); /* [X + Y, X + Y, X + Y, X + Y] */
502 accumulate_s2 = _mm_add_epi32(accumulate_s2, shuffled); /* [/, /, /, W + Z + X + Y] */
503 s2 += accumulate_s1 * 16 + _mm_cvtsi128_si32(accumulate_s2);
504 #else
505 do {
506 ADLER32_SCALAR_DO16(buf);
507 buf += 16;
508 } while (buf != end);
509 #endif
510
511 *s1_out = s1;
512 *s2_out = s2;
513 }
514
zend_adler32(unsigned int checksum,unsigned char * buf,uint32_t len)515 unsigned int zend_adler32(unsigned int checksum, unsigned char *buf, uint32_t len)
516 {
517 unsigned int s1 = checksum & 0xffff;
518 unsigned int s2 = (checksum >> 16) & 0xffff;
519 unsigned char *end;
520
521 while (len >= ADLER32_NMAX) {
522 len -= ADLER32_NMAX;
523 end = buf + ADLER32_NMAX;
524 adler32_do16_loop(buf, end, &s1, &s2);
525 buf = end;
526 s1 %= ADLER32_BASE;
527 s2 %= ADLER32_BASE;
528 }
529
530 if (len) {
531 if (len >= 16) {
532 end = buf + (len & 0xfff0);
533 len &= 0xf;
534 adler32_do16_loop(buf, end, &s1, &s2);
535 buf = end;
536 }
537 if (len) {
538 end = buf + len;
539 do {
540 ADLER32_SCALAR_DO1(buf);
541 buf++;
542 } while (buf != end);
543 }
544 s1 %= ADLER32_BASE;
545 s2 %= ADLER32_BASE;
546 }
547
548 return (s2 << 16) | s1;
549 }
550
zend_accel_script_checksum(zend_persistent_script * persistent_script)551 unsigned int zend_accel_script_checksum(zend_persistent_script *persistent_script)
552 {
553 unsigned char *mem = (unsigned char*)persistent_script->mem;
554 size_t size = persistent_script->size;
555 size_t persistent_script_check_block_size = ((char *)&(persistent_script->dynamic_members)) - (char *)persistent_script;
556 unsigned int checksum = ADLER32_INIT;
557
558 if (mem < (unsigned char*)persistent_script) {
559 checksum = zend_adler32(checksum, mem, (unsigned char*)persistent_script - mem);
560 size -= (unsigned char*)persistent_script - mem;
561 mem += (unsigned char*)persistent_script - mem;
562 }
563
564 zend_adler32(checksum, mem, persistent_script_check_block_size);
565 mem += sizeof(*persistent_script);
566 size -= sizeof(*persistent_script);
567
568 if (size > 0) {
569 checksum = zend_adler32(checksum, mem, size);
570 }
571 return checksum;
572 }
573
