1 /*
2 +----------------------------------------------------------------------+
3 | Zend JIT |
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: Dmitry Stogov <dmitry@php.net> |
16 | Xinchen Hui <laruence@php.net> |
17 +----------------------------------------------------------------------+
18 */
19
20 #include "Zend/zend_execute.h"
21 #include "Zend/zend_exceptions.h"
22 #include "Zend/zend_vm.h"
23 #include "Zend/zend_closures.h"
24 #include "Zend/zend_constants.h"
25 #include "Zend/zend_API.h"
26
27 #include <ZendAccelerator.h>
28 #include "Optimizer/zend_func_info.h"
29 #include "Optimizer/zend_call_graph.h"
30 #include "zend_jit.h"
31 #if ZEND_JIT_TARGET_X86
32 # include "zend_jit_x86.h"
33 #elif ZEND_JIT_TARGET_ARM64
34 # include "zend_jit_arm64.h"
35 #endif
36
37 #include "zend_jit_internal.h"
38
39 #ifdef HAVE_GCC_GLOBAL_REGS
40 # pragma GCC diagnostic ignored "-Wvolatile-register-var"
41 # if defined(__x86_64__)
42 register zend_execute_data* volatile execute_data __asm__("%r14");
43 register const zend_op* volatile opline __asm__("%r15");
44 # elif defined(i386)
45 register zend_execute_data* volatile execute_data __asm__("%esi");
46 register const zend_op* volatile opline __asm__("%edi");
47 # elif defined(__aarch64__)
48 register zend_execute_data* volatile execute_data __asm__("x27");
49 register const zend_op* volatile opline __asm__("x28");
50 # endif
51 # pragma GCC diagnostic warning "-Wvolatile-register-var"
52 #endif
53
zend_jit_leave_nested_func_helper(uint32_t call_info EXECUTE_DATA_DC)54 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_leave_nested_func_helper(uint32_t call_info EXECUTE_DATA_DC)
55 {
56 zend_execute_data *old_execute_data;
57
58 if (UNEXPECTED(call_info & ZEND_CALL_HAS_SYMBOL_TABLE)) {
59 zend_clean_and_cache_symbol_table(EX(symbol_table));
60 }
61
62 zend_vm_stack_free_extra_args_ex(call_info, execute_data);
63 if (UNEXPECTED(call_info & ZEND_CALL_RELEASE_THIS)) {
64 OBJ_RELEASE(Z_OBJ(execute_data->This));
65 } else if (UNEXPECTED(call_info & ZEND_CALL_CLOSURE)) {
66 OBJ_RELEASE(ZEND_CLOSURE_OBJECT(EX(func)));
67 }
68 if (UNEXPECTED(call_info & ZEND_CALL_HAS_EXTRA_NAMED_PARAMS)) {
69 zend_free_extra_named_params(EX(extra_named_params));
70 }
71
72 old_execute_data = execute_data;
73 execute_data = EX(prev_execute_data);
74 zend_vm_stack_free_call_frame_ex(call_info, old_execute_data);
75
76 if (UNEXPECTED(EG(exception) != NULL)) {
77 const zend_op *old_opline = EX(opline);
78 zend_throw_exception_internal(NULL);
79 if (old_opline->result_type != IS_UNDEF) {
80 zval_ptr_dtor(EX_VAR(old_opline->result.var));
81 }
82 #ifndef HAVE_GCC_GLOBAL_REGS
83 return 2; // ZEND_VM_LEAVE
84 #endif
85 } else {
86 EX(opline)++;
87 #ifdef HAVE_GCC_GLOBAL_REGS
88 opline = EX(opline);
89 #else
90 return 2; // ZEND_VM_LEAVE
91 #endif
92 }
93 }
94
zend_jit_leave_top_func_helper(uint32_t call_info EXECUTE_DATA_DC)95 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_leave_top_func_helper(uint32_t call_info EXECUTE_DATA_DC)
96 {
97 if (UNEXPECTED(call_info & (ZEND_CALL_HAS_SYMBOL_TABLE|ZEND_CALL_FREE_EXTRA_ARGS))) {
98 if (UNEXPECTED(call_info & ZEND_CALL_HAS_SYMBOL_TABLE)) {
99 zend_clean_and_cache_symbol_table(EX(symbol_table));
100 }
101 zend_vm_stack_free_extra_args_ex(call_info, execute_data);
102 }
103 if (UNEXPECTED(call_info & ZEND_CALL_HAS_EXTRA_NAMED_PARAMS)) {
104 zend_free_extra_named_params(EX(extra_named_params));
105 }
106 if (UNEXPECTED(call_info & ZEND_CALL_CLOSURE)) {
107 OBJ_RELEASE(ZEND_CLOSURE_OBJECT(EX(func)));
108 }
109 execute_data = EG(current_execute_data);
110 #ifdef HAVE_GCC_GLOBAL_REGS
111 opline = zend_jit_halt_op;
112 #else
113 return -1; // ZEND_VM_RETURN
114 #endif
115 }
116
zend_jit_leave_func_helper(EXECUTE_DATA_D)117 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_leave_func_helper(EXECUTE_DATA_D)
118 {
119 uint32_t call_info = EX_CALL_INFO();
120
121 if (call_info & ZEND_CALL_TOP) {
122 ZEND_OPCODE_TAIL_CALL_EX(zend_jit_leave_top_func_helper, call_info);
123 } else {
124 ZEND_OPCODE_TAIL_CALL_EX(zend_jit_leave_nested_func_helper, call_info);
125 }
126 }
127
zend_jit_copy_extra_args_helper(EXECUTE_DATA_D)128 void ZEND_FASTCALL zend_jit_copy_extra_args_helper(EXECUTE_DATA_D)
129 {
130 zend_op_array *op_array = &EX(func)->op_array;
131
132 if (EXPECTED(!(op_array->fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE))) {
133 uint32_t first_extra_arg = op_array->num_args;
134 uint32_t num_args = EX_NUM_ARGS();
135 zval *end, *src, *dst;
136 uint32_t type_flags = 0;
137
138 if (EXPECTED((op_array->fn_flags & ZEND_ACC_HAS_TYPE_HINTS) == 0)) {
139 /* Skip useless ZEND_RECV and ZEND_RECV_INIT opcodes */
140 #ifdef HAVE_GCC_GLOBAL_REGS
141 opline += first_extra_arg;
142 #else
143 EX(opline) += first_extra_arg;
144 #endif
145 }
146
147 /* move extra args into separate array after all CV and TMP vars */
148 end = EX_VAR_NUM(first_extra_arg - 1);
149 src = end + (num_args - first_extra_arg);
150 dst = src + (op_array->last_var + op_array->T - first_extra_arg);
151 if (EXPECTED(src != dst)) {
152 do {
153 type_flags |= Z_TYPE_INFO_P(src);
154 ZVAL_COPY_VALUE(dst, src);
155 ZVAL_UNDEF(src);
156 src--;
157 dst--;
158 } while (src != end);
159 if (type_flags & (IS_TYPE_REFCOUNTED << Z_TYPE_FLAGS_SHIFT)) {
160 ZEND_ADD_CALL_FLAG(execute_data, ZEND_CALL_FREE_EXTRA_ARGS);
161 }
162 } else {
163 do {
164 if (Z_REFCOUNTED_P(src)) {
165 ZEND_ADD_CALL_FLAG(execute_data, ZEND_CALL_FREE_EXTRA_ARGS);
166 break;
167 }
168 src--;
169 } while (src != end);
170 }
171 }
172 }
173
zend_jit_deprecated_helper(OPLINE_D)174 bool ZEND_FASTCALL zend_jit_deprecated_helper(OPLINE_D)
175 {
176 zend_execute_data *call = (zend_execute_data *) opline;
177 zend_function *fbc = call->func;
178
179 zend_deprecated_function(fbc);
180
181 if (EG(exception)) {
182 #ifndef HAVE_GCC_GLOBAL_REGS
183 zend_execute_data *execute_data = EG(current_execute_data);
184 #endif
185 const zend_op *opline = EG(opline_before_exception);
186 if (RETURN_VALUE_USED(opline)) {
187 ZVAL_UNDEF(EX_VAR(opline->result.var));
188 }
189
190 zend_vm_stack_free_args(call);
191
192 if (UNEXPECTED(ZEND_CALL_INFO(call) & ZEND_CALL_RELEASE_THIS)) {
193 OBJ_RELEASE(Z_OBJ(call->This));
194 }
195
196 zend_vm_stack_free_call_frame(call);
197 return 0;
198 }
199 return 1;
200 }
201
zend_jit_undefined_long_key(EXECUTE_DATA_D)202 void ZEND_FASTCALL zend_jit_undefined_long_key(EXECUTE_DATA_D)
203 {
204 const zend_op *opline = EX(opline);
205 zval *result = EX_VAR(opline->result.var);
206 zval *dim;
207
208 if (opline->op2_type == IS_CONST) {
209 dim = RT_CONSTANT(opline, opline->op2);
210 } else {
211 dim = EX_VAR(opline->op2.var);
212 }
213 ZEND_ASSERT(Z_TYPE_P(dim) == IS_LONG);
214 zend_error(E_WARNING, "Undefined array key " ZEND_LONG_FMT, Z_LVAL_P(dim));
215 ZVAL_NULL(result);
216 }
217
zend_jit_undefined_string_key(EXECUTE_DATA_D)218 void ZEND_FASTCALL zend_jit_undefined_string_key(EXECUTE_DATA_D)
219 {
220 const zend_op *opline = EX(opline);
221 zval *result = EX_VAR(opline->result.var);
222 zval *dim;
223 zend_ulong lval;
224
225 if (opline->op2_type == IS_CONST) {
226 dim = RT_CONSTANT(opline, opline->op2);
227 } else {
228 dim = EX_VAR(opline->op2.var);
229 }
230 ZEND_ASSERT(Z_TYPE_P(dim) == IS_STRING);
231 if (ZEND_HANDLE_NUMERIC(Z_STR_P(dim), lval)) {
232 zend_error(E_WARNING, "Undefined array key " ZEND_LONG_FMT, lval);
233 } else {
234 zend_error(E_WARNING, "Undefined array key \"%s\"", Z_STRVAL_P(dim));
235 }
236 ZVAL_NULL(result);
237 }
238
zend_jit_profile_helper(ZEND_OPCODE_HANDLER_ARGS)239 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_profile_helper(ZEND_OPCODE_HANDLER_ARGS)
240 {
241 zend_op_array *op_array = (zend_op_array*)EX(func);
242 zend_jit_op_array_extension *jit_extension = (zend_jit_op_array_extension*)ZEND_FUNC_INFO(op_array);
243 zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t) jit_extension->orig_handler;
244 ++*(uintptr_t*)(EX(run_time_cache) + zend_jit_profile_counter_rid);
245 ++zend_jit_profile_counter;
246 ZEND_OPCODE_TAIL_CALL(handler);
247 }
248
zend_jit_func_counter_helper(ZEND_OPCODE_HANDLER_ARGS)249 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_func_counter_helper(ZEND_OPCODE_HANDLER_ARGS)
250 {
251 zend_jit_op_array_hot_extension *jit_extension =
252 (zend_jit_op_array_hot_extension*)ZEND_FUNC_INFO(&EX(func)->op_array);
253 #ifndef HAVE_GCC_GLOBAL_REGS
254 const zend_op *opline = EX(opline);
255 #endif
256
257 *(jit_extension->counter) -= ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_func) - 1) / JIT_G(hot_func));
258
259 if (UNEXPECTED(*(jit_extension->counter) <= 0)) {
260 *(jit_extension->counter) = ZEND_JIT_COUNTER_INIT;
261 zend_jit_hot_func(execute_data, opline);
262 ZEND_OPCODE_RETURN();
263 } else {
264 zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t)jit_extension->orig_handlers[opline - EX(func)->op_array.opcodes];
265 ZEND_OPCODE_TAIL_CALL(handler);
266 }
267 }
268
zend_jit_loop_counter_helper(ZEND_OPCODE_HANDLER_ARGS)269 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_loop_counter_helper(ZEND_OPCODE_HANDLER_ARGS)
270 {
271 zend_jit_op_array_hot_extension *jit_extension =
272 (zend_jit_op_array_hot_extension*)ZEND_FUNC_INFO(&EX(func)->op_array);
273 #ifndef HAVE_GCC_GLOBAL_REGS
274 const zend_op *opline = EX(opline);
275 #endif
276
277 *(jit_extension->counter) -= ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_loop) - 1) / JIT_G(hot_loop));
278
279 if (UNEXPECTED(*(jit_extension->counter) <= 0)) {
280 *(jit_extension->counter) = ZEND_JIT_COUNTER_INIT;
281 zend_jit_hot_func(execute_data, opline);
282 ZEND_OPCODE_RETURN();
283 } else {
284 zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t)jit_extension->orig_handlers[opline - EX(func)->op_array.opcodes];
285 ZEND_OPCODE_TAIL_CALL(handler);
286 }
287 }
288
_zend_quick_get_constant(const zval * key,uint32_t flags,int check_defined_only)289 static zend_always_inline zend_constant* _zend_quick_get_constant(
290 const zval *key, uint32_t flags, int check_defined_only)
291 {
292 #ifndef HAVE_GCC_GLOBAL_REGS
293 zend_execute_data *execute_data = EG(current_execute_data);
294 #endif
295 const zend_op *opline = EX(opline);
296 zval *zv;
297 zend_constant *c = NULL;
298
299 /* null/true/false are resolved during compilation, so don't check for them here. */
300 zv = zend_hash_find_known_hash(EG(zend_constants), Z_STR_P(key));
301 if (zv) {
302 c = (zend_constant*)Z_PTR_P(zv);
303 } else if (flags & IS_CONSTANT_UNQUALIFIED_IN_NAMESPACE) {
304 key++;
305 zv = zend_hash_find_known_hash(EG(zend_constants), Z_STR_P(key));
306 if (zv) {
307 c = (zend_constant*)Z_PTR_P(zv);
308 }
309 }
310
311 if (!c) {
312 if (!check_defined_only) {
313 zend_throw_error(NULL, "Undefined constant \"%s\"", Z_STRVAL_P(RT_CONSTANT(opline, opline->op2)));
314 ZVAL_UNDEF(EX_VAR(opline->result.var));
315 }
316 CACHE_PTR(opline->extended_value, ENCODE_SPECIAL_CACHE_NUM(zend_hash_num_elements(EG(zend_constants))));
317 return NULL;
318 }
319
320 if (!check_defined_only) {
321 if (ZEND_CONSTANT_FLAGS(c) & CONST_DEPRECATED) {
322 zend_error(E_DEPRECATED, "Constant %s is deprecated", ZSTR_VAL(c->name));
323 if (EG(exception)) {
324 return NULL;
325 }
326 return c;
327 }
328 }
329
330 CACHE_PTR(opline->extended_value, c);
331 return c;
332 }
333
zend_jit_get_constant(const zval * key,uint32_t flags)334 zend_constant* ZEND_FASTCALL zend_jit_get_constant(const zval *key, uint32_t flags)
335 {
336 return _zend_quick_get_constant(key, flags, 0);
337 }
338
zend_jit_check_constant(const zval * key)339 zend_constant* ZEND_FASTCALL zend_jit_check_constant(const zval *key)
340 {
341 return _zend_quick_get_constant(key, 0, 1);
342 }
343
zend_jit_trace_counter_helper(uint32_t cost ZEND_OPCODE_HANDLER_ARGS_DC)344 static zend_always_inline ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_trace_counter_helper(uint32_t cost ZEND_OPCODE_HANDLER_ARGS_DC)
345 {
346 zend_jit_op_array_trace_extension *jit_extension =
347 (zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(&EX(func)->op_array);
348 size_t offset = jit_extension->offset;
349 #ifndef HAVE_GCC_GLOBAL_REGS
350 const zend_op *opline = EX(opline);
351 #endif
352
353 *(ZEND_OP_TRACE_INFO(opline, offset)->counter) -= cost;
354
355 if (UNEXPECTED(*(ZEND_OP_TRACE_INFO(opline, offset)->counter) <= 0)) {
356 *(ZEND_OP_TRACE_INFO(opline, offset)->counter) = ZEND_JIT_COUNTER_INIT;
357 if (UNEXPECTED(zend_jit_trace_hot_root(execute_data, opline) < 0)) {
358 #ifdef HAVE_GCC_GLOBAL_REGS
359 opline = NULL;
360 return;
361 #else
362 return -1;
363 #endif
364 }
365 #ifdef HAVE_GCC_GLOBAL_REGS
366 execute_data = EG(current_execute_data);
367 opline = execute_data ? EX(opline) : NULL;
368 return;
369 #else
370 return 1;
371 #endif
372 } else {
373 zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t)ZEND_OP_TRACE_INFO(opline, offset)->orig_handler;
374 ZEND_OPCODE_TAIL_CALL(handler);
375 }
376 }
377
zend_jit_func_trace_helper(ZEND_OPCODE_HANDLER_ARGS)378 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_func_trace_helper(ZEND_OPCODE_HANDLER_ARGS)
379 {
380 ZEND_OPCODE_TAIL_CALL_EX(zend_jit_trace_counter_helper,
381 ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_func) - 1) / JIT_G(hot_func)));
382 }
383
zend_jit_ret_trace_helper(ZEND_OPCODE_HANDLER_ARGS)384 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_ret_trace_helper(ZEND_OPCODE_HANDLER_ARGS)
385 {
386 ZEND_OPCODE_TAIL_CALL_EX(zend_jit_trace_counter_helper,
387 ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_return) - 1) / JIT_G(hot_return)));
388 }
389
zend_jit_loop_trace_helper(ZEND_OPCODE_HANDLER_ARGS)390 ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_loop_trace_helper(ZEND_OPCODE_HANDLER_ARGS)
391 {
392 ZEND_OPCODE_TAIL_CALL_EX(zend_jit_trace_counter_helper,
393 ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_loop) - 1) / JIT_G(hot_loop)));
394 }
395
396 #define TRACE_RECORD(_op, _info, _ptr) \
397 trace_buffer[idx].info = _op | (_info); \
398 trace_buffer[idx].ptr = _ptr; \
399 idx++; \
400 if (idx >= ZEND_JIT_TRACE_MAX_LENGTH - 2) { \
401 stop = ZEND_JIT_TRACE_STOP_TOO_LONG; \
402 break; \
403 }
404
405 #define TRACE_RECORD_VM(_op, _ptr, _op1_type, _op2_type, _op3_type) \
406 trace_buffer[idx].op = _op; \
407 trace_buffer[idx].op1_type = _op1_type; \
408 trace_buffer[idx].op2_type = _op2_type; \
409 trace_buffer[idx].op3_type = _op3_type; \
410 trace_buffer[idx].ptr = _ptr; \
411 idx++; \
412 if (idx >= ZEND_JIT_TRACE_MAX_LENGTH - 2) { \
413 stop = ZEND_JIT_TRACE_STOP_TOO_LONG; \
414 break; \
415 }
416
417 #define TRACE_START(_op, _start, _ptr1, _ptr2) \
418 trace_buffer[0].op = _op; \
419 trace_buffer[0].start = _start; \
420 trace_buffer[0].level = 0; \
421 trace_buffer[0].ptr = _ptr1; \
422 trace_buffer[1].last = 0; \
423 trace_buffer[1].ptr = _ptr2; \
424 idx = ZEND_JIT_TRACE_START_REC_SIZE;
425
426 #define TRACE_END(_op, _stop, _ptr) \
427 trace_buffer[1].last = idx; \
428 trace_buffer[idx].op = _op; \
429 trace_buffer[idx].start = trace_buffer[idx].start; \
430 trace_buffer[idx].stop = trace_buffer[0].stop = _stop; \
431 trace_buffer[idx].level = trace_buffer[0].level = ret_level ? ret_level + 1 : 0; \
432 trace_buffer[idx].ptr = _ptr;
433
zend_jit_trace_recursive_call_count(const zend_op_array * op_array,const zend_op_array ** unrolled_calls,int ret_level,int level)434 static int zend_jit_trace_recursive_call_count(const zend_op_array *op_array, const zend_op_array **unrolled_calls, int ret_level, int level)
435 {
436 int i;
437 int count = 0;
438
439 for (i = ret_level; i < level; i++) {
440 count += (unrolled_calls[i] == op_array);
441 }
442 return count;
443 }
444
zend_jit_trace_recursive_ret_count(const zend_op_array * op_array,const zend_op_array ** unrolled_calls,int ret_level)445 static int zend_jit_trace_recursive_ret_count(const zend_op_array *op_array, const zend_op_array **unrolled_calls, int ret_level)
446 {
447 int i;
448 int count = 0;
449
450 for (i = 0; i < ret_level; i++) {
451 count += (unrolled_calls[i] == op_array);
452 }
453 return count;
454 }
455
zend_jit_trace_has_recursive_ret(zend_execute_data * ex,const zend_op_array * orig_op_array,const zend_op * orig_opline,int ret_level)456 static int zend_jit_trace_has_recursive_ret(zend_execute_data *ex, const zend_op_array *orig_op_array, const zend_op *orig_opline, int ret_level)
457 {
458 while (ex != NULL && ex->func != NULL && ret_level < ZEND_JIT_TRACE_MAX_RET_DEPTH) {
459 if (&ex->func->op_array == orig_op_array && ex->opline + 1 == orig_opline) {
460 return 1;
461 }
462 ex = ex->prev_execute_data;
463 ret_level++;
464 }
465 return 0;
466 }
467
zend_jit_trace_bad_stop_event(const zend_op * opline,int count)468 static uint8_t zend_jit_trace_bad_stop_event(const zend_op *opline, int count)
469 {
470 const zend_op **cache_opline = JIT_G(bad_root_cache_opline);
471 uint8_t *cache_count = JIT_G(bad_root_cache_count);
472 uint8_t *cache_stop = JIT_G(bad_root_cache_stop);
473 uint32_t i;
474
475 if (count < 0) {
476 count = 0;
477 }
478 for (i = 0; i < ZEND_JIT_TRACE_BAD_ROOT_SLOTS; i++) {
479 if (cache_opline[i] == opline) {
480 if (cache_count[i] >= count) {
481 return cache_stop[i];
482 }
483 break;
484 }
485 }
486 return 0;
487 }
488
489 #define ZEND_CALL_MEGAMORPHIC ZEND_CALL_JIT_RESERVED
490
zend_jit_trace_record_fake_init_call_ex(zend_execute_data * call,zend_jit_trace_rec * trace_buffer,int idx,uint32_t is_megamorphic,uint32_t init_level)491 static int zend_jit_trace_record_fake_init_call_ex(zend_execute_data *call, zend_jit_trace_rec *trace_buffer, int idx, uint32_t is_megamorphic, uint32_t init_level)
492 {
493 zend_jit_trace_stop stop ZEND_ATTRIBUTE_UNUSED = ZEND_JIT_TRACE_STOP_ERROR;
494
495 do {
496 zend_function *func;
497 zend_jit_op_array_trace_extension *jit_extension;
498
499 if (call->prev_execute_data) {
500 idx = zend_jit_trace_record_fake_init_call_ex(call->prev_execute_data, trace_buffer, idx, is_megamorphic, init_level + 1);
501 if (idx < 0) {
502 return idx;
503 }
504 }
505
506 func = call->func;
507 if (func->common.fn_flags & (ZEND_ACC_CALL_VIA_TRAMPOLINE|ZEND_ACC_NEVER_CACHE)) {
508 /* TODO: Can we continue recording ??? */
509 return -1;
510 }
511 if (func->type == ZEND_INTERNAL_FUNCTION
512 && (func->op_array.fn_flags & (ZEND_ACC_CLOSURE|ZEND_ACC_FAKE_CLOSURE))) {
513 return -1;
514 }
515 if (func->type == ZEND_USER_FUNCTION
516 && (func->op_array.fn_flags & ZEND_ACC_CLOSURE)) {
517 jit_extension =
518 (zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(&func->op_array);
519 if (UNEXPECTED(!jit_extension
520 || !(jit_extension->func_info.flags & ZEND_FUNC_JIT_ON_HOT_TRACE)
521 || (func->op_array.fn_flags & ZEND_ACC_FAKE_CLOSURE))) {
522 return -1;
523 }
524 func = (zend_function*)jit_extension->op_array;
525 }
526 if (is_megamorphic == ZEND_JIT_EXIT_POLYMORPHISM
527 /* TODO: use more accurate check ??? */
528 && ((ZEND_CALL_INFO(call) & ZEND_CALL_DYNAMIC)
529 || func->common.scope)) {
530 func = NULL;
531 ZEND_ADD_CALL_FLAG(call, ZEND_CALL_MEGAMORPHIC);
532 }
533 TRACE_RECORD(ZEND_JIT_TRACE_INIT_CALL, ZEND_JIT_TRACE_FAKE_INFO(init_level), func);
534 } while (0);
535 return idx;
536 }
537
zend_jit_trace_record_fake_init_call(zend_execute_data * call,zend_jit_trace_rec * trace_buffer,int idx,uint32_t is_megamorphic)538 static int zend_jit_trace_record_fake_init_call(zend_execute_data *call, zend_jit_trace_rec *trace_buffer, int idx, uint32_t is_megamorphic)
539 {
540 return zend_jit_trace_record_fake_init_call_ex(call, trace_buffer, idx, is_megamorphic, 0);
541 }
542
zend_jit_trace_subtrace(zend_jit_trace_rec * trace_buffer,int start,int end,uint8_t event,const zend_op_array * op_array,const zend_op * opline)543 static int zend_jit_trace_subtrace(zend_jit_trace_rec *trace_buffer, int start, int end, uint8_t event, const zend_op_array *op_array, const zend_op *opline)
544 {
545 int idx;
546
547 TRACE_START(ZEND_JIT_TRACE_START, event, op_array, opline);
548 memmove(trace_buffer + idx, trace_buffer + start, (end - start) * sizeof(zend_jit_trace_rec));
549 return idx + (end - start);
550 }
551
552 /*
553 * Trace Linking Rules
554 * ===================
555 *
556 * flags
557 * +----------+----------+----------++----------+----------+----------+
558 * | || JIT |
559 * +----------+----------+----------++----------+----------+----------+
560 * start | LOOP | ENTER | RETURN || LOOP | ENTER | RETURN |
561 * +========+==========+==========+==========++==========+==========+==========+
562 * | LOOP | loop | | loop-ret || COMPILED | LINK | LINK |
563 * +--------+----------+----------+----------++----------+----------+----------+
564 * | ENTER |INNER_LOOP| rec-call | return || LINK | LINK | LINK |
565 * +--------+----------+----------+----------++----------+----------+----------+
566 * | RETURN |INNER_LOOP| | rec-ret || LINK | | LINK |
567 * +--------+----------+----------+----------++----------+----------+----------+
568 * | SIDE | unroll | | return || LINK | LINK | LINK |
569 * +--------+----------+----------+----------++----------+----------+----------+
570 *
571 * loop: LOOP if "cycle" and level == 0, otherwise INNER_LOOP
572 * INNER_LOOP: abort recording and start new one (wait for loop)
573 * COMPILED: abort recording (wait while side exit creates outer loop)
574 * unroll: continue recording while unroll limit reached
575 * rec-call: RECURSIVE_CALL if "cycle" and level > N, otherwise continue
576 * loop-ret: LOOP_EXIT if level == 0, otherwise continue (wait for loop)
577 * return: RETURN if level == 0
578 * rec_ret: RECURSIVE_RET if "cycle" and ret_level > N, otherwise continue
579 *
580 */
581
zend_jit_trace_execute(zend_execute_data * ex,const zend_op * op,zend_jit_trace_rec * trace_buffer,uint8_t start,uint32_t is_megamorphic)582 zend_jit_trace_stop ZEND_FASTCALL zend_jit_trace_execute(zend_execute_data *ex, const zend_op *op, zend_jit_trace_rec *trace_buffer, uint8_t start, uint32_t is_megamorphic)
583
584 {
585 #ifdef HAVE_GCC_GLOBAL_REGS
586 zend_execute_data *save_execute_data = execute_data;
587 const zend_op *save_opline = opline;
588 #endif
589 const zend_op *orig_opline, *end_opline;
590 zend_jit_trace_stop stop = ZEND_JIT_TRACE_STOP_ERROR;
591 zend_jit_trace_stop halt = 0;
592 int level = 0;
593 int ret_level = 0;
594 zend_vm_opcode_handler_t handler;
595 const zend_op_array *op_array;
596 zend_jit_op_array_trace_extension *jit_extension;
597 size_t offset;
598 int idx, count;
599 uint8_t trace_flags, op1_type, op2_type, op3_type;
600 zend_class_entry *ce1, *ce2;
601 const zend_op *link_to_enter_opline = NULL;
602 int backtrack_link_to_enter = -1;
603 int backtrack_recursion = -1;
604 int backtrack_ret_recursion = -1;
605 int backtrack_ret_recursion_level = 0;
606 int loop_unroll_limit = 0;
607 int last_loop = -1;
608 int last_loop_level = -1;
609 const zend_op *last_loop_opline = NULL;
610 const zend_op_array *unrolled_calls[ZEND_JIT_TRACE_MAX_CALL_DEPTH + ZEND_JIT_TRACE_MAX_RET_DEPTH];
611 #ifdef HAVE_GCC_GLOBAL_REGS
612 zend_execute_data *prev_execute_data = ex;
613
614 execute_data = ex;
615 opline = EX(opline) = op;
616 #else
617 int rc;
618 zend_execute_data *execute_data = ex;
619 const zend_op *opline = EX(opline);
620 #endif
621 zend_execute_data *prev_call = EX(call);
622
623 orig_opline = opline;
624
625 op_array = &EX(func)->op_array;
626 jit_extension =
627 (zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(op_array);
628 offset = jit_extension->offset;
629 if (!op_array->function_name
630 || (op_array->fn_flags & ZEND_ACC_CLOSURE)) {
631 op_array = jit_extension->op_array;
632 }
633
634 TRACE_START(ZEND_JIT_TRACE_START, start, op_array, opline);
635
636 if (UNEXPECTED(opline->opcode == ZEND_HANDLE_EXCEPTION)) {
637 /* Abort trace because of exception */
638 TRACE_END(ZEND_JIT_TRACE_END, ZEND_JIT_TRACE_STOP_EXCEPTION, opline);
639 #ifdef HAVE_GCC_GLOBAL_REGS
640 execute_data = save_execute_data;
641 opline = save_opline;
642 #endif
643 return ZEND_JIT_TRACE_STOP_EXCEPTION;
644 }
645
646 trace_flags = ZEND_OP_TRACE_INFO(opline, offset)->trace_flags;
647 if (trace_flags & ZEND_JIT_TRACE_UNSUPPORTED) {
648 TRACE_END(ZEND_JIT_TRACE_END, ZEND_JIT_TRACE_STOP_NOT_SUPPORTED, opline);
649 #ifdef HAVE_GCC_GLOBAL_REGS
650 execute_data = save_execute_data;
651 opline = save_opline;
652 #endif
653 return ZEND_JIT_TRACE_STOP_NOT_SUPPORTED;
654 }
655
656 if (prev_call) {
657 int ret = zend_jit_trace_record_fake_init_call(prev_call, trace_buffer, idx, is_megamorphic);
658 if (ret < 0) {
659 TRACE_END(ZEND_JIT_TRACE_END, ZEND_JIT_TRACE_STOP_BAD_FUNC, opline);
660 #ifdef HAVE_GCC_GLOBAL_REGS
661 execute_data = save_execute_data;
662 opline = save_opline;
663 #endif
664 return ZEND_JIT_TRACE_STOP_BAD_FUNC;
665 }
666 idx = ret;
667 }
668
669 while (1) {
670 ce1 = ce2 = NULL;
671 op1_type = op2_type = op3_type = IS_UNKNOWN;
672 if ((opline->op1_type & (IS_TMP_VAR|IS_VAR|IS_CV))
673 && opline->opcode != ZEND_ROPE_ADD
674 && opline->opcode != ZEND_ROPE_END
675 && opline->opcode != ZEND_NEW
676 && opline->opcode != ZEND_FETCH_CLASS_CONSTANT
677 && opline->opcode != ZEND_INIT_STATIC_METHOD_CALL) {
678 zval *zv = EX_VAR(opline->op1.var);
679 op1_type = Z_TYPE_P(zv);
680 uint8_t flags = 0;
681
682 if (op1_type == IS_INDIRECT) {
683 zv = Z_INDIRECT_P(zv);
684 op1_type = Z_TYPE_P(zv);
685 flags |= IS_TRACE_INDIRECT;
686 }
687 if (op1_type == IS_REFERENCE) {
688 zv = Z_REFVAL_P(zv);
689 op1_type = Z_TYPE_P(zv);
690 flags |= IS_TRACE_REFERENCE;
691 }
692 if (Z_TYPE_P(zv) == IS_OBJECT) {
693 ce1 = Z_OBJCE_P(zv);
694 } else if (Z_TYPE_P(zv) == IS_ARRAY) {
695 if (HT_IS_PACKED(Z_ARRVAL_P(zv))) {
696 flags |= IS_TRACE_PACKED;
697 }
698 }
699 op1_type |= flags;
700 }
701 if (opline->op2_type & (IS_TMP_VAR|IS_VAR|IS_CV)
702 && opline->opcode != ZEND_INSTANCEOF
703 && opline->opcode != ZEND_UNSET_STATIC_PROP
704 && opline->opcode != ZEND_ISSET_ISEMPTY_STATIC_PROP
705 && opline->opcode != ZEND_ASSIGN_STATIC_PROP
706 && opline->opcode != ZEND_ASSIGN_STATIC_PROP_REF
707 && opline->opcode != ZEND_ASSIGN_STATIC_PROP_OP
708 && opline->opcode != ZEND_PRE_INC_STATIC_PROP
709 && opline->opcode != ZEND_POST_INC_STATIC_PROP
710 && opline->opcode != ZEND_PRE_DEC_STATIC_PROP
711 && opline->opcode != ZEND_POST_DEC_STATIC_PROP
712 && opline->opcode != ZEND_FETCH_STATIC_PROP_R
713 && opline->opcode != ZEND_FETCH_STATIC_PROP_W
714 && opline->opcode != ZEND_FETCH_STATIC_PROP_RW
715 && opline->opcode != ZEND_FETCH_STATIC_PROP_IS
716 && opline->opcode != ZEND_FETCH_STATIC_PROP_FUNC_ARG
717 && opline->opcode != ZEND_FETCH_STATIC_PROP_UNSET
718 && (opline->op2_type == IS_CV
719 || (opline->opcode != ZEND_FE_FETCH_R
720 && opline->opcode != ZEND_FE_FETCH_RW))) {
721 zval *zv = EX_VAR(opline->op2.var);
722 uint8_t flags = 0;
723
724 op2_type = Z_TYPE_P(zv);
725 if (op2_type == IS_INDIRECT) {
726 zv = Z_INDIRECT_P(zv);
727 op2_type = Z_TYPE_P(zv);
728 flags |= IS_TRACE_INDIRECT;
729 }
730 if (op2_type == IS_REFERENCE) {
731 zv = Z_REFVAL_P(zv);
732 op2_type = Z_TYPE_P(zv);
733 flags |= IS_TRACE_REFERENCE;
734 }
735 if (Z_TYPE_P(zv) == IS_OBJECT) {
736 ce2 = Z_OBJCE_P(zv);
737 }
738 op2_type |= flags;
739 }
740 if (opline->opcode == ZEND_ASSIGN_DIM ||
741 opline->opcode == ZEND_ASSIGN_OBJ ||
742 opline->opcode == ZEND_ASSIGN_STATIC_PROP ||
743 opline->opcode == ZEND_ASSIGN_DIM_OP ||
744 opline->opcode == ZEND_ASSIGN_OBJ_OP ||
745 opline->opcode == ZEND_ASSIGN_STATIC_PROP_OP ||
746 opline->opcode == ZEND_ASSIGN_OBJ_REF ||
747 opline->opcode == ZEND_ASSIGN_STATIC_PROP_REF) {
748 if ((opline+1)->op1_type & (IS_TMP_VAR|IS_VAR|IS_CV)) {
749 zval *zv = EX_VAR((opline+1)->op1.var);
750 uint8_t flags = 0;
751
752 op3_type = Z_TYPE_P(zv);
753 if (op3_type == IS_INDIRECT) {
754 zv = Z_INDIRECT_P(zv);
755 op3_type = Z_TYPE_P(zv);
756 flags |= IS_TRACE_INDIRECT;
757 }
758 if (op3_type == IS_REFERENCE) {
759 zv = Z_REFVAL_P(zv);
760 op3_type = Z_TYPE_P(zv);
761 flags |= IS_TRACE_REFERENCE;
762 }
763 op3_type |= flags;
764 }
765 }
766
767 TRACE_RECORD_VM(ZEND_JIT_TRACE_VM, opline, op1_type, op2_type, op3_type);
768
769 if (ce1) {
770 TRACE_RECORD(ZEND_JIT_TRACE_OP1_TYPE, 0, ce1);
771 }
772
773 if (ce2) {
774 TRACE_RECORD(ZEND_JIT_TRACE_OP2_TYPE, 0, ce2);
775 }
776
777 switch (opline->opcode) {
778 case ZEND_FETCH_DIM_R:
779 case ZEND_FETCH_DIM_W:
780 case ZEND_FETCH_DIM_RW:
781 case ZEND_FETCH_DIM_IS:
782 case ZEND_FETCH_DIM_FUNC_ARG:
783 case ZEND_FETCH_DIM_UNSET:
784 case ZEND_FETCH_LIST_R:
785 case ZEND_FETCH_LIST_W:
786 case ZEND_ASSIGN_DIM:
787 case ZEND_ASSIGN_DIM_OP:
788 case ZEND_UNSET_DIM:
789 case ZEND_ISSET_ISEMPTY_DIM_OBJ:
790 if (opline->op1_type == IS_CONST) {
791 zval *arr = RT_CONSTANT(opline, opline->op1);
792 op1_type = Z_TYPE_P(arr);
793 }
794 if ((op1_type & IS_TRACE_TYPE_MASK) == IS_ARRAY
795 && opline->op2_type != IS_UNDEF) {
796 zval *arr, *dim, *val;
797 uint8_t val_type = IS_UNDEF;
798
799 if (opline->op2_type == IS_CONST) {
800 dim = RT_CONSTANT(opline, opline->op2);
801 } else {
802 dim = EX_VAR(opline->op2.var);
803 }
804
805 if (Z_TYPE_P(dim) == IS_LONG || Z_TYPE_P(dim) == IS_STRING) {
806 if (opline->op1_type == IS_CONST) {
807 arr = RT_CONSTANT(opline, opline->op1);
808 } else {
809 arr = EX_VAR(opline->op1.var);
810 }
811 if (Z_TYPE_P(arr) == IS_INDIRECT) {
812 arr = Z_INDIRECT_P(arr);
813 }
814 if (Z_TYPE_P(arr) == IS_REFERENCE) {
815 arr = Z_REFVAL_P(arr);
816 }
817 ZEND_ASSERT(Z_TYPE_P(arr) == IS_ARRAY);
818 if (Z_TYPE_P(dim) == IS_LONG) {
819 val = zend_hash_index_find(Z_ARRVAL_P(arr), Z_LVAL_P(dim));
820 } else /*if Z_TYPE_P(dim) == IS_STRING)*/ {
821 val = zend_symtable_find(Z_ARRVAL_P(arr), Z_STR_P(dim));
822 }
823 if (val) {
824 val_type = Z_TYPE_P(val);
825 }
826 TRACE_RECORD_VM(ZEND_JIT_TRACE_VAL_INFO, NULL, val_type, 0, 0);
827 }
828 }
829 break;
830 case ZEND_FETCH_OBJ_R:
831 case ZEND_FETCH_OBJ_W:
832 case ZEND_FETCH_OBJ_RW:
833 case ZEND_FETCH_OBJ_IS:
834 case ZEND_FETCH_OBJ_FUNC_ARG:
835 case ZEND_FETCH_OBJ_UNSET:
836 case ZEND_ASSIGN_OBJ:
837 case ZEND_ASSIGN_OBJ_OP:
838 case ZEND_ASSIGN_OBJ_REF:
839 case ZEND_UNSET_OBJ:
840 case ZEND_ISSET_ISEMPTY_PROP_OBJ:
841 case ZEND_PRE_INC_OBJ:
842 case ZEND_PRE_DEC_OBJ:
843 case ZEND_POST_INC_OBJ:
844 case ZEND_POST_DEC_OBJ:
845 if (opline->op1_type != IS_CONST
846 && opline->op2_type == IS_CONST
847 && Z_TYPE_P(RT_CONSTANT(opline, opline->op2)) == IS_STRING
848 && Z_STRVAL_P(RT_CONSTANT(opline, opline->op2))[0] != '\0') {
849 zval *obj, *val;
850 zend_string *prop_name = Z_STR_P(RT_CONSTANT(opline, opline->op2));
851 zend_property_info *prop_info;
852
853 if (opline->op1_type == IS_UNUSED) {
854 obj = &EX(This);
855 } else {
856 obj = EX_VAR(opline->op1.var);
857 }
858 if (Z_TYPE_P(obj) != IS_OBJECT
859 || Z_OBJ_P(obj)->handlers != &std_object_handlers) {
860 break;
861 }
862 prop_info = zend_get_property_info(Z_OBJCE_P(obj), prop_name, 1);
863 if (prop_info
864 && prop_info != ZEND_WRONG_PROPERTY_INFO
865 && !(prop_info->flags & ZEND_ACC_STATIC)) {
866 val = OBJ_PROP(Z_OBJ_P(obj), prop_info->offset);
867 TRACE_RECORD_VM(ZEND_JIT_TRACE_VAL_INFO, NULL, Z_TYPE_P(val), 0, 0);
868 }
869 }
870 break;
871 default:
872 break;
873 }
874
875 if (opline->opcode == ZEND_DO_FCALL
876 || opline->opcode == ZEND_DO_ICALL
877 || opline->opcode == ZEND_DO_UCALL
878 || opline->opcode == ZEND_DO_FCALL_BY_NAME) {
879 if (ZEND_CALL_INFO(EX(call)) & ZEND_CALL_MEGAMORPHIC) {
880 stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
881 break;
882 }
883 if (EX(call)->func->type == ZEND_INTERNAL_FUNCTION) {
884 if (EX(call)->func->op_array.fn_flags & (ZEND_ACC_CLOSURE|ZEND_ACC_FAKE_CLOSURE)) {
885 stop = ZEND_JIT_TRACE_STOP_BAD_FUNC;
886 break;
887 }
888 TRACE_RECORD(ZEND_JIT_TRACE_DO_ICALL, 0, EX(call)->func);
889 }
890 } else if (opline->opcode == ZEND_INCLUDE_OR_EVAL
891 || opline->opcode == ZEND_CALLABLE_CONVERT) {
892 /* TODO: Support tracing JIT for ZEND_CALLABLE_CONVERT. */
893 stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
894 break;
895 }
896
897 handler = (zend_vm_opcode_handler_t)ZEND_OP_TRACE_INFO(opline, offset)->call_handler;
898 #ifdef HAVE_GCC_GLOBAL_REGS
899 handler();
900 if (UNEXPECTED(opline == zend_jit_halt_op)) {
901 stop = ZEND_JIT_TRACE_STOP_RETURN;
902 opline = NULL;
903 halt = ZEND_JIT_TRACE_HALT;
904 break;
905 }
906 if (UNEXPECTED(execute_data != prev_execute_data)) {
907 #else
908 rc = handler(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU);
909 if (rc != 0) {
910 if (rc < 0) {
911 stop = ZEND_JIT_TRACE_STOP_RETURN;
912 opline = NULL;
913 halt = ZEND_JIT_TRACE_HALT;
914 break;
915 } else if (execute_data == EG(current_execute_data)) {
916 /* return after interrupt handler */
917 rc = 0;
918 }
919 execute_data = EG(current_execute_data);
920 opline = EX(opline);
921 #endif
922
923 op_array = &EX(func)->op_array;
924 jit_extension =
925 (zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(op_array);
926 if (UNEXPECTED(!jit_extension)
927 || UNEXPECTED(!(jit_extension->func_info.flags & ZEND_FUNC_JIT_ON_HOT_TRACE))) {
928 stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
929 break;
930 }
931 offset = jit_extension->offset;
932 if (!op_array->function_name
933 || (op_array->fn_flags & ZEND_ACC_CLOSURE)) {
934 op_array = jit_extension->op_array;
935 }
936
937 #ifdef HAVE_GCC_GLOBAL_REGS
938 if (execute_data->prev_execute_data == prev_execute_data) {
939 #else
940 if (rc == 0) {
941 /* pass */
942 } else if (rc == 1) {
943 #endif
944 /* Enter into function */
945 prev_call = NULL;
946 if (level > ZEND_JIT_TRACE_MAX_CALL_DEPTH) {
947 stop = ZEND_JIT_TRACE_STOP_TOO_DEEP;
948 break;
949 }
950
951 if (EX(func)->op_array.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) {
952 /* TODO: Can we continue recording ??? */
953 stop = ZEND_JIT_TRACE_STOP_TRAMPOLINE;
954 break;
955 }
956
957 TRACE_RECORD(ZEND_JIT_TRACE_ENTER,
958 EX(return_value) != NULL ? ZEND_JIT_TRACE_RETURN_VALUE_USED : 0,
959 op_array);
960
961 count = zend_jit_trace_recursive_call_count(&EX(func)->op_array, unrolled_calls, ret_level, level);
962
963 if (opline == orig_opline) {
964 if (count + 1 >= JIT_G(max_recursive_calls)) {
965 stop = ZEND_JIT_TRACE_STOP_RECURSIVE_CALL;
966 break;
967 }
968 backtrack_recursion = idx;
969 } else if (count >= JIT_G(max_recursive_calls)) {
970 stop = ZEND_JIT_TRACE_STOP_DEEP_RECURSION;
971 break;
972 }
973
974 unrolled_calls[ret_level + level] = &EX(func)->op_array;
975 level++;
976 } else {
977 /* Return from function */
978 prev_call = EX(call);
979 if (level == 0) {
980 if (start == ZEND_JIT_TRACE_START_RETURN
981 && JIT_G(max_recursive_returns) > 0
982 && execute_data->prev_execute_data
983 && execute_data->prev_execute_data->func
984 && execute_data->prev_execute_data->func->type == ZEND_USER_FUNCTION
985 && zend_jit_trace_has_recursive_ret(execute_data, trace_buffer[0].op_array, orig_opline, ret_level)) {
986 if (ret_level > ZEND_JIT_TRACE_MAX_RET_DEPTH) {
987 stop = ZEND_JIT_TRACE_STOP_TOO_DEEP_RET;
988 break;
989 }
990 TRACE_RECORD(ZEND_JIT_TRACE_BACK, 0, op_array);
991 count = zend_jit_trace_recursive_ret_count(&EX(func)->op_array, unrolled_calls, ret_level);
992 if (opline == orig_opline) {
993 if (count + 1 >= JIT_G(max_recursive_returns)) {
994 stop = ZEND_JIT_TRACE_STOP_RECURSIVE_RET;
995 break;
996 }
997 backtrack_ret_recursion = idx;
998 backtrack_ret_recursion_level = ret_level;
999 } else if (count >= JIT_G(max_recursive_returns)) {
1000 stop = ZEND_JIT_TRACE_STOP_DEEP_RECURSION;
1001 break;
1002 }
1003
1004 unrolled_calls[ret_level] = &EX(func)->op_array;
1005 ret_level++;
1006 last_loop_opline = NULL;
1007
1008 if (prev_call) {
1009 int ret = zend_jit_trace_record_fake_init_call(prev_call, trace_buffer, idx, 0);
1010 if (ret < 0) {
1011 stop = ZEND_JIT_TRACE_STOP_BAD_FUNC;
1012 break;
1013 }
1014 idx = ret;
1015 }
1016 } else if (start & ZEND_JIT_TRACE_START_LOOP
1017 && zend_jit_trace_bad_stop_event(orig_opline, JIT_G(blacklist_root_trace) - 1) !=
1018 ZEND_JIT_TRACE_STOP_LOOP_EXIT) {
1019 /* Fail to try close the loop.
1020 If this doesn't work terminate it. */
1021 stop = ZEND_JIT_TRACE_STOP_LOOP_EXIT;
1022 break;
1023 } else if (start & ZEND_JIT_TRACE_START_ENTER
1024 && EX(prev_execute_data)
1025 && EX(func) == EX(prev_execute_data)->func
1026 && zend_jit_trace_bad_stop_event(orig_opline, JIT_G(blacklist_root_trace) - 1) !=
1027 ZEND_JIT_TRACE_STOP_RECURSION_EXIT) {
1028 stop = ZEND_JIT_TRACE_STOP_RECURSION_EXIT;
1029 break;
1030 } else {
1031 stop = ZEND_JIT_TRACE_STOP_RETURN;
1032 break;
1033 }
1034 } else {
1035 level--;
1036 if (level < last_loop_level) {
1037 last_loop_opline = NULL;
1038 }
1039 TRACE_RECORD(ZEND_JIT_TRACE_BACK, 0, op_array);
1040 }
1041 }
1042 #ifdef HAVE_GCC_GLOBAL_REGS
1043 prev_execute_data = execute_data;
1044 #endif
1045 }
1046 if (EX(call) != prev_call) {
1047 if (EX(call)
1048 && EX(call)->prev_execute_data == prev_call) {
1049 zend_function *func;
1050 zend_jit_op_array_trace_extension *jit_extension;
1051
1052 if (EX(call)->func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) {
1053 /* TODO: Can we continue recording ??? */
1054 stop = ZEND_JIT_TRACE_STOP_TRAMPOLINE;
1055 break;
1056 } else if (EX(call)->func->common.fn_flags & ZEND_ACC_NEVER_CACHE) {
1057 /* TODO: Can we continue recording ??? */
1058 stop = ZEND_JIT_TRACE_STOP_BAD_FUNC;
1059 break;
1060 }
1061 func = EX(call)->func;
1062 if (func->type == ZEND_INTERNAL_FUNCTION
1063 && (func->op_array.fn_flags & (ZEND_ACC_CLOSURE|ZEND_ACC_FAKE_CLOSURE))) {
1064 stop = ZEND_JIT_TRACE_STOP_BAD_FUNC;
1065 break;
1066 }
1067 if (func->type == ZEND_USER_FUNCTION
1068 && (func->op_array.fn_flags & ZEND_ACC_CLOSURE)) {
1069 jit_extension =
1070 (zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(&func->op_array);
1071 if (UNEXPECTED(!jit_extension)
1072 || !(jit_extension->func_info.flags & ZEND_FUNC_JIT_ON_HOT_TRACE)
1073 || (func->op_array.fn_flags & ZEND_ACC_FAKE_CLOSURE)) {
1074 stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
1075 break;
1076 }
1077 func = (zend_function*)jit_extension->op_array;
1078 }
1079
1080 #ifndef HAVE_GCC_GLOBAL_REGS
1081 opline = EX(opline);
1082 #endif
1083
1084 if (JIT_G(max_polymorphic_calls) == 0
1085 && zend_jit_may_be_polymorphic_call(opline - 1)) {
1086 func = NULL;
1087 } else if ((is_megamorphic == ZEND_JIT_EXIT_METHOD_CALL
1088 || is_megamorphic == ZEND_JIT_EXIT_CLOSURE_CALL)
1089 && trace_buffer[1].opline == opline - 1) {
1090 func = NULL;
1091 }
1092 if (!func) {
1093 ZEND_ADD_CALL_FLAG(EX(call), ZEND_CALL_MEGAMORPHIC);
1094 }
1095 TRACE_RECORD(ZEND_JIT_TRACE_INIT_CALL, 0, func);
1096 }
1097 prev_call = EX(call);
1098 }
1099
1100 #ifndef HAVE_GCC_GLOBAL_REGS
1101 opline = EX(opline);
1102 #endif
1103
1104 if (UNEXPECTED(opline->opcode == ZEND_HANDLE_EXCEPTION)) {
1105 /* Abort trace because of exception */
1106 stop = ZEND_JIT_TRACE_STOP_EXCEPTION;
1107 break;
1108 }
1109
1110 trace_flags = ZEND_OP_TRACE_INFO(opline, offset)->trace_flags;
1111 if (trace_flags) {
1112 if (trace_flags & ZEND_JIT_TRACE_JITED) {
1113 if (trace_flags & ZEND_JIT_TRACE_START_LOOP) {
1114 if ((start & ZEND_JIT_TRACE_START_LOOP) != 0
1115 && level + ret_level == 0
1116 && zend_jit_trace_bad_stop_event(orig_opline, JIT_G(blacklist_root_trace) - 1) !=
1117 ZEND_JIT_TRACE_STOP_COMPILED_LOOP) {
1118 /* Fail to try close outer loop through side exit.
1119 If this doesn't work just link. */
1120 stop = ZEND_JIT_TRACE_STOP_COMPILED_LOOP;
1121 break;
1122 } else {
1123 stop = ZEND_JIT_TRACE_STOP_LINK;
1124 break;
1125 }
1126 } else if (trace_flags & ZEND_JIT_TRACE_START_ENTER) {
1127 if (start != ZEND_JIT_TRACE_START_RETURN) {
1128 // TODO: We may try to inline function ???
1129 stop = ZEND_JIT_TRACE_STOP_LINK;
1130 break;
1131 }
1132 if (backtrack_link_to_enter < 0) {
1133 backtrack_link_to_enter = idx;
1134 link_to_enter_opline = opline;
1135 }
1136 } else {
1137 stop = ZEND_JIT_TRACE_STOP_LINK;
1138 break;
1139 }
1140 } else if (trace_flags & ZEND_JIT_TRACE_BLACKLISTED) {
1141 stop = ZEND_JIT_TRACE_STOP_BLACK_LIST;
1142 break;
1143 } else if (trace_flags & ZEND_JIT_TRACE_START_LOOP) {
1144 uint8_t bad_stop;
1145
1146 if (start != ZEND_JIT_TRACE_START_SIDE) {
1147 if (opline == orig_opline && level + ret_level == 0) {
1148 stop = ZEND_JIT_TRACE_STOP_LOOP;
1149 break;
1150 }
1151 }
1152
1153 if (start != ZEND_JIT_TRACE_START_SIDE
1154 || level + ret_level != 0) {
1155 /* First try creating a trace for inner loop.
1156 If this doesn't work try loop unroling. */
1157 bad_stop = zend_jit_trace_bad_stop_event(opline,
1158 JIT_G(blacklist_root_trace) / 2);
1159 if (bad_stop != ZEND_JIT_TRACE_STOP_INNER_LOOP
1160 && bad_stop != ZEND_JIT_TRACE_STOP_LOOP_EXIT) {
1161 if (start == ZEND_JIT_TRACE_START_SIDE
1162 || zend_jit_trace_bad_stop_event(orig_opline,
1163 JIT_G(blacklist_root_trace) / 2) != ZEND_JIT_TRACE_STOP_INNER_LOOP) {
1164 stop = ZEND_JIT_TRACE_STOP_INNER_LOOP;
1165 break;
1166 }
1167 }
1168 }
1169
1170 if (opline == last_loop_opline
1171 && level == last_loop_level) {
1172 idx = zend_jit_trace_subtrace(trace_buffer,
1173 last_loop, idx, ZEND_JIT_TRACE_START_LOOP, op_array, opline);
1174 start = ZEND_JIT_TRACE_START_LOOP;
1175 stop = ZEND_JIT_TRACE_STOP_LOOP;
1176 ret_level = 0;
1177 break;
1178 } else if (loop_unroll_limit < JIT_G(max_loop_unrolls)) {
1179 last_loop = idx;
1180 last_loop_opline = opline;
1181 last_loop_level = level;
1182 loop_unroll_limit++;
1183 } else {
1184 stop = ZEND_JIT_TRACE_STOP_LOOP_UNROLL;
1185 break;
1186 }
1187 } else if (trace_flags & ZEND_JIT_TRACE_UNSUPPORTED) {
1188 TRACE_RECORD(ZEND_JIT_TRACE_VM, 0, opline);
1189 stop = ZEND_JIT_TRACE_STOP_NOT_SUPPORTED;
1190 break;
1191 }
1192 }
1193 }
1194
1195 end_opline = opline;
1196 if (!ZEND_JIT_TRACE_STOP_OK(stop)) {
1197 if (backtrack_recursion > 0) {
1198 idx = backtrack_recursion;
1199 stop = ZEND_JIT_TRACE_STOP_RECURSIVE_CALL;
1200 end_opline = orig_opline;
1201 } else if (backtrack_ret_recursion > 0) {
1202 idx = backtrack_ret_recursion;
1203 ret_level = backtrack_ret_recursion_level;
1204 stop = ZEND_JIT_TRACE_STOP_RECURSIVE_RET;
1205 end_opline = orig_opline;
1206 } else if (backtrack_link_to_enter > 0) {
1207 if (stop == ZEND_JIT_TRACE_STOP_DEEP_RECURSION
1208 && zend_jit_trace_bad_stop_event(orig_opline, JIT_G(blacklist_root_trace) / 2) ==
1209 ZEND_JIT_TRACE_STOP_DEEP_RECURSION) {
1210 idx = backtrack_link_to_enter;
1211 stop = ZEND_JIT_TRACE_STOP_LINK;
1212 end_opline = link_to_enter_opline;
1213 }
1214 }
1215 }
1216
1217 if (stop == ZEND_JIT_TRACE_STOP_LINK) {
1218 /* Shrink fake INIT_CALLs */
1219 while (trace_buffer[idx-1].op == ZEND_JIT_TRACE_INIT_CALL
1220 && (trace_buffer[idx-1].info & ZEND_JIT_TRACE_FAKE_INIT_CALL)) {
1221 idx--;
1222 }
1223 }
1224
1225 TRACE_END(ZEND_JIT_TRACE_END, stop, end_opline);
1226
1227 #ifdef HAVE_GCC_GLOBAL_REGS
1228 if (!halt) {
1229 EX(opline) = opline;
1230 }
1231 #endif
1232
1233 #ifdef HAVE_GCC_GLOBAL_REGS
1234 execute_data = save_execute_data;
1235 opline = save_opline;
1236 #endif
1237
1238 return stop | halt;
1239 }
1240
