/src/php-src/Zend/Optimizer/zend_dfg.c

Source
/*
   +----------------------------------------------------------------------+
   | Zend Engine, DFG - Data Flow Graph                                   |
   +----------------------------------------------------------------------+
   | Copyright © The PHP Group and Contributors.                          |
   +----------------------------------------------------------------------+
   | This source file is subject to the Modified BSD License that is      |
   | bundled with this package in the file LICENSE, and is available      |
   | through the World Wide Web at <https://www.php.net/license/>.        |
   |                                                                      |
   | SPDX-License-Identifier: BSD-3-Clause                                |
   +----------------------------------------------------------------------+
   | Authors: Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#include "zend_compile.h"
#include "zend_dfg.h"

static zend_always_inline void zend_dfg_add_use_def_op_impl(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:
    case ZEND_FRAMELESS_ICALL_3:
      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_BIND_INIT_STATIC_OR_JMP:
    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);
      }
      ZEND_FALLTHROUGH;
    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_impl(op_array, opline, build_flags, use, def);
}
/* }}} */

void zend_build_dfg(const zend_op_array *op_array, const zend_cfg *cfg, const zend_dfg *dfg, uint32_t build_flags) /* {{{ */
{
  uint32_t set_size = dfg->size;
  zend_basic_block *blocks = cfg->blocks;
  uint32_t blocks_count = cfg->blocks_count;
  zend_bitset tmp, def, use, in, out;
  uint32_t j;

  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++) {
    const 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_impl(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 (uint32_t 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 */
        {
          const int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
          for (uint32_t k = 0; k < blocks[j].predecessors_count; k++) {
            zend_bitset_incl(worklist, predecessors[k]);
          }
        }
      }
    }

    free_alloca(worklist, use_heap);
  }
}
/* }}} */

Coverage Report

Created: 2026-06-02 06:40

Line	Count	Source
1		/*
2		+----------------------------------------------------------------------+
3		\| Zend Engine, DFG - Data Flow Graph \|
4		+----------------------------------------------------------------------+
5		\| Copyright © The PHP Group and Contributors. \|
6		+----------------------------------------------------------------------+
7		\| This source file is subject to the Modified BSD License that is \|
8		\| bundled with this package in the file LICENSE, and is available \|
9		\| through the World Wide Web at <https://www.php.net/license/>. \|
10		\| \|
11		\| SPDX-License-Identifier: BSD-3-Clause \|
12		+----------------------------------------------------------------------+
13		\| Authors: Dmitry Stogov <dmitry@php.net> \|
14		+----------------------------------------------------------------------+
15		*/
16
17		#include "zend_compile.h"
18		#include "zend_dfg.h"
19
20		static zend_always_inline void zend_dfg_add_use_def_op_impl(const zend_op_array op_array, const zend_op opline, uint32_t build_flags, zend_bitset use, zend_bitset def) /* {{{ */
21	714k	{
22	714k	uint32_t var_num;
23	714k	const zend_op *next;
24
25	714k	if (opline->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
26	409k	var_num = EX_VAR_TO_NUM(opline->op1.var);
27	409k	if (!zend_bitset_in(def, var_num)) {
28	106k	zend_bitset_incl(use, var_num);
29	106k	}
30	409k	}
31	714k	if (((opline->op2_type & (IS_VAR\|IS_TMP_VAR)) != 0
32	56.5k	&& opline->opcode != ZEND_FE_FETCH_R
33	56.3k	&& opline->opcode != ZEND_FE_FETCH_RW)
34	657k	\|\| (opline->op2_type == IS_CV)) {
35	125k	var_num = EX_VAR_TO_NUM(opline->op2.var);
36	125k	if (!zend_bitset_in(def, var_num)) {
37	68.2k	zend_bitset_incl(use, var_num);
38	68.2k	}
39	125k	}
40	714k	if ((build_flags & ZEND_SSA_USE_CV_RESULTS)
41	0	&& opline->result_type == IS_CV
42	0	&& opline->opcode != ZEND_RECV) {
43	0	var_num = EX_VAR_TO_NUM(opline->result.var);
44	0	if (!zend_bitset_in(def, var_num)) {
45	0	zend_bitset_incl(use, var_num);
46	0	}
47	0	}
48
49	714k	switch (opline->opcode) {
50	31.5k	case ZEND_ASSIGN:
51	31.5k	if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op2_type == IS_CV) {
52	0	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
53	0	}
54	31.5k	if (opline->op1_type == IS_CV) {
55	59.1k	add_op1_def:
56	59.1k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op1.var));
57	59.1k	}
58	59.3k	break;
59	59.3k	case ZEND_ASSIGN_REF:
60	1.15k	if (opline->op2_type == IS_CV) {
61	636	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
62	636	}
63	1.15k	if (opline->op1_type == IS_CV) {
64	895	goto add_op1_def;
65	895	}
66	262	break;
67	5.19k	case ZEND_ASSIGN_DIM:
68	9.99k	case ZEND_ASSIGN_OBJ:
69	9.99k	next = opline + 1;
70	9.99k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
71	6.30k	var_num = EX_VAR_TO_NUM(next->op1.var);
72	6.30k	if (!zend_bitset_in(def, var_num)) {
73	1.03k	zend_bitset_incl(use, var_num);
74	1.03k	}
75	6.30k	if (build_flags & ZEND_SSA_RC_INFERENCE && next->op1_type == IS_CV) {
76	0	zend_bitset_incl(def, var_num);
77	0	}
78	6.30k	}
79	9.99k	if (opline->op1_type == IS_CV) {
80	6.15k	goto add_op1_def;
81	6.15k	}
82	3.83k	break;
83	3.83k	case ZEND_ASSIGN_OBJ_REF:
84	200	next = opline + 1;
85	200	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
86	200	var_num = EX_VAR_TO_NUM(next->op1.var);
87	200	if (!zend_bitset_in(def, var_num)) {
88	40	zend_bitset_incl(use, var_num);
89	40	}
90	200	if (next->op1_type == IS_CV) {
91	140	zend_bitset_incl(def, var_num);
92	140	}
93	200	}
94	200	if (opline->op1_type == IS_CV) {
95	74	goto add_op1_def;
96	74	}
97	126	break;
98	463	case ZEND_ASSIGN_STATIC_PROP:
99	463	next = opline + 1;
100	463	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
101	261	var_num = EX_VAR_TO_NUM(next->op1.var);
102	261	if (!zend_bitset_in(def, var_num)) {
103	58	zend_bitset_incl(use, var_num);
104	58	}
105	261	if ((build_flags & ZEND_SSA_RC_INFERENCE) && next->op1_type == IS_CV) {
106	0	zend_bitset_incl(def, var_num);
107	0	}
108	261	}
109	463	break;
110	72	case ZEND_ASSIGN_STATIC_PROP_REF:
111	72	next = opline + 1;
112	72	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
113	72	var_num = EX_VAR_TO_NUM(next->op1.var);
114	72	if (!zend_bitset_in(def, var_num)) {
115	8	zend_bitset_incl(use, var_num);
116	8	}
117	72	if (next->op1_type == IS_CV) {
118	26	zend_bitset_incl(def, var_num);
119	26	}
120	72	}
121	72	break;
122	2	case ZEND_ASSIGN_STATIC_PROP_OP:
123	2	case ZEND_FRAMELESS_ICALL_3:
124	2	next = opline + 1;
125	2	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
126	0	var_num = EX_VAR_TO_NUM(next->op1.var);
127	0	if (!zend_bitset_in(def, var_num)) {
128	0	zend_bitset_incl(use, var_num);
129	0	}
130	0	}
131	2	break;
132	721	case ZEND_ASSIGN_DIM_OP:
133	1.02k	case ZEND_ASSIGN_OBJ_OP:
134	1.02k	next = opline + 1;
135	1.02k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
136	366	var_num = EX_VAR_TO_NUM(next->op1.var);
137	366	if (!zend_bitset_in(def, var_num)) {
138	111	zend_bitset_incl(use, var_num);
139	111	}
140	366	}
141	1.02k	if (opline->op1_type == IS_CV) {
142	895	goto add_op1_def;
143	895	}
144	129	break;
145	2.22k	case ZEND_ASSIGN_OP:
146	4.65k	case ZEND_PRE_INC:
147	5.01k	case ZEND_PRE_DEC:
148	5.52k	case ZEND_POST_INC:
149	6.34k	case ZEND_POST_DEC:
150	6.74k	case ZEND_BIND_GLOBAL:
151	12.2k	case ZEND_BIND_STATIC:
152	12.3k	case ZEND_BIND_INIT_STATIC_OR_JMP:
153	12.5k	case ZEND_SEND_VAR_NO_REF:
154	13.2k	case ZEND_SEND_VAR_NO_REF_EX:
155	15.5k	case ZEND_SEND_VAR_EX:
156	15.9k	case ZEND_SEND_FUNC_ARG:
157	17.1k	case ZEND_SEND_REF:
158	17.5k	case ZEND_SEND_UNPACK:
159	17.8k	case ZEND_FE_RESET_RW:
160	18.2k	case ZEND_MAKE_REF:
161	18.4k	case ZEND_PRE_INC_OBJ:
162	18.5k	case ZEND_PRE_DEC_OBJ:
163	18.6k	case ZEND_POST_INC_OBJ:
164	18.6k	case ZEND_POST_DEC_OBJ:
165	19.2k	case ZEND_UNSET_DIM:
166	19.6k	case ZEND_UNSET_OBJ:
167	22.5k	case ZEND_FETCH_DIM_W:
168	22.5k	case ZEND_FETCH_DIM_RW:
169	22.7k	case ZEND_FETCH_DIM_FUNC_ARG:
170	22.8k	case ZEND_FETCH_DIM_UNSET:
171	22.9k	case ZEND_FETCH_LIST_W:
172	22.9k	if (opline->op1_type == IS_CV) {
173	18.0k	goto add_op1_def;
174	18.0k	}
175	4.97k	break;
176	10.6k	case ZEND_SEND_VAR:
177	11.7k	case ZEND_CAST:
178	16.5k	case ZEND_QM_ASSIGN:
179	17.2k	case ZEND_JMP_SET:
180	19.1k	case ZEND_COALESCE:
181	20.8k	case ZEND_FE_RESET_R:
182	20.8k	if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op1_type == IS_CV) {
183	0	goto add_op1_def;
184	0	}
185	20.8k	break;
186	20.8k	case ZEND_ADD_ARRAY_UNPACK:
187	71	var_num = EX_VAR_TO_NUM(opline->result.var);
188	71	if (!zend_bitset_in(def, var_num)) {
189	0	zend_bitset_incl(use, var_num);
190	0	}
191	71	break;
192	5.70k	case ZEND_ADD_ARRAY_ELEMENT:
193	5.70k	var_num = EX_VAR_TO_NUM(opline->result.var);
194	5.70k	if (!zend_bitset_in(def, var_num)) {
195	538	zend_bitset_incl(use, var_num);
196	538	}
197	5.70k	ZEND_FALLTHROUGH;
198	7.57k	case ZEND_INIT_ARRAY:
199	7.57k	if (((build_flags & ZEND_SSA_RC_INFERENCE)
200	7.57k	\|\| (opline->extended_value & ZEND_ARRAY_ELEMENT_REF))
201	132	&& opline->op1_type == IS_CV) {
202	121	goto add_op1_def;
203	121	}
204	7.45k	break;
205	7.45k	case ZEND_YIELD:
206	928	if (opline->op1_type == IS_CV
207	152	&& ((op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)
208	120	\|\| (build_flags & ZEND_SSA_RC_INFERENCE))) {
209	32	goto add_op1_def;
210	32	}
211	896	break;
212	896	case ZEND_UNSET_CV:
213	666	goto add_op1_def;
214	1.67k	case ZEND_VERIFY_RETURN_TYPE:
215	1.67k	if (opline->op1_type & (IS_TMP_VAR\|IS_VAR\|IS_CV)) {
216	900	goto add_op1_def;
217	900	}
218	772	break;
219	1.65k	case ZEND_FE_FETCH_R:
220	1.98k	case ZEND_FE_FETCH_RW:
221		#if 0
222		/* This special case was handled above the switch */
223		if (opline->op2_type != IS_CV) {
224		op2_use = -1; /* not used */
225		}
226		#endif
227	1.98k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
228	1.98k	break;
229	5.21k	case ZEND_BIND_LEXICAL:
230	5.21k	if ((opline->extended_value & ZEND_BIND_REF) \|\| (build_flags & ZEND_SSA_RC_INFERENCE)) {
231	244	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
232	244	}
233	5.21k	break;
234	607k	default:
235	607k	break;
236	714k	}
237
238	714k	if (opline->result_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
239	361k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->result.var));
240	361k	}
241	714k	}
242		/* }}} */
243
244		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) /* {{{ */
245	0	{
246	0	zend_dfg_add_use_def_op_impl(op_array, opline, build_flags, use, def);
247	0	}
248		/* }}} */
249
250		void zend_build_dfg(const zend_op_array op_array, const zend_cfg cfg, const zend_dfg dfg, uint32_t build_flags) / {{{ */
251	34.0k	{
252	34.0k	uint32_t set_size = dfg->size;
253	34.0k	zend_basic_block *blocks = cfg->blocks;
254	34.0k	uint32_t blocks_count = cfg->blocks_count;
255	34.0k	zend_bitset tmp, def, use, in, out;
256	34.0k	uint32_t j;
257
258	34.0k	tmp = dfg->tmp;
259	34.0k	def = dfg->def;
260	34.0k	use = dfg->use;
261	34.0k	in = dfg->in;
262	34.0k	out = dfg->out;
263
264		/* Collect "def" and "use" sets */
265	127k	for (j = 0; j < blocks_count; j++) {
266	92.9k	const zend_op opline, end;
267	92.9k	zend_bitset b_use, b_def;
268
269	92.9k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
270	10	continue;
271	10	}
272
273	92.9k	opline = op_array->opcodes + blocks[j].start;
274	92.9k	end = opline + blocks[j].len;
275	92.9k	b_use = DFG_BITSET(use, set_size, j);
276	92.9k	b_def = DFG_BITSET(def, set_size, j);
277	819k	for (; opline < end; opline++) {
278	726k	if (opline->opcode != ZEND_OP_DATA) {
279	714k	zend_dfg_add_use_def_op_impl(op_array, opline, build_flags, b_use, b_def);
280	714k	}
281	726k	}
282	92.9k	}
283
284		/* Calculate "in" and "out" sets */
285	34.0k	{
286	34.0k	uint32_t worklist_len = zend_bitset_len(blocks_count);
287	34.0k	zend_bitset worklist;
288	34.0k	ALLOCA_FLAG(use_heap);
289	34.0k	worklist = ZEND_BITSET_ALLOCA(worklist_len, use_heap);
290	34.0k	memset(worklist, 0, worklist_len * ZEND_BITSET_ELM_SIZE);
291	127k	for (j = 0; j < blocks_count; j++) {
292	92.9k	zend_bitset_incl(worklist, j);
293	92.9k	}
294	154k	while (!zend_bitset_empty(worklist, worklist_len)) {
295		/* We use the last block on the worklist, because predecessors tend to be located
296		* before the succeeding block, so this converges faster. */
297	120k	j = zend_bitset_last(worklist, worklist_len);
298	120k	zend_bitset_excl(worklist, j);
299
300	120k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
301	10	continue;
302	10	}
303	120k	if (blocks[j].successors_count != 0) {
304	85.3k	zend_bitset_copy(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[0]), set_size);
305	128k	for (uint32_t k = 1; k < blocks[j].successors_count; k++) {
306	43.2k	zend_bitset_union(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[k]), set_size);
307	43.2k	}
308	85.3k	} else {
309	35.1k	zend_bitset_clear(DFG_BITSET(out, set_size, j), set_size);
310	35.1k	}
311	120k	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);
312	120k	if (!zend_bitset_equal(DFG_BITSET(in, set_size, j), tmp, set_size)) {
313	85.9k	zend_bitset_copy(DFG_BITSET(in, set_size, j), tmp, set_size);
314
315		/* Add predecessors of changed block to worklist */
316	85.9k	{
317	85.9k	const int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
318	192k	for (uint32_t k = 0; k < blocks[j].predecessors_count; k++) {
319	106k	zend_bitset_incl(worklist, predecessors[k]);
320	106k	}
321	85.9k	}
322	85.9k	}
323	120k	}
324
325		free_alloca(worklist, use_heap);
326	34.0k	}
327	34.0k	}
328		/* }}} */