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

Source (jump to first uncovered line)
/*
   +----------------------------------------------------------------------+
   | Zend Engine, DFG - Data Flow Graph                                   |
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

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

static zend_always_inline void _zend_dfg_add_use_def_op(const zend_op_array *op_array, const zend_op *opline, uint32_t build_flags, zend_bitset use, zend_bitset def) /* {{{ */
{
  uint32_t var_num;
  const zend_op *next;

  if (opline->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
    var_num = EX_VAR_TO_NUM(opline->op1.var);
    if (!zend_bitset_in(def, var_num)) {
      zend_bitset_incl(use, var_num);
    }
  }
  if (((opline->op2_type & (IS_VAR|IS_TMP_VAR)) != 0
    && opline->opcode != ZEND_FE_FETCH_R
    && opline->opcode != ZEND_FE_FETCH_RW)
   || (opline->op2_type == IS_CV)) {
    var_num = EX_VAR_TO_NUM(opline->op2.var);
    if (!zend_bitset_in(def, var_num)) {
      zend_bitset_incl(use, var_num);
    }
  }
  if ((build_flags & ZEND_SSA_USE_CV_RESULTS)
   && opline->result_type == IS_CV
   && opline->opcode != ZEND_RECV) {
    var_num = EX_VAR_TO_NUM(opline->result.var);
    if (!zend_bitset_in(def, var_num)) {
      zend_bitset_incl(use, var_num);
    }
  }

  switch (opline->opcode) {
    case ZEND_ASSIGN:
      if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op2_type == IS_CV) {
        zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
      }
      if (opline->op1_type == IS_CV) {
add_op1_def:
        zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op1.var));
      }
      break;
    case ZEND_ASSIGN_REF:
      if (opline->op2_type == IS_CV) {
        zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
      }
      if (opline->op1_type == IS_CV) {
        goto add_op1_def;
      }
      break;
    case ZEND_ASSIGN_DIM:
    case ZEND_ASSIGN_OBJ:
      next = opline + 1;
      if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
        var_num = EX_VAR_TO_NUM(next->op1.var);
        if (!zend_bitset_in(def, var_num)) {
          zend_bitset_incl(use, var_num);
        }
        if (build_flags & ZEND_SSA_RC_INFERENCE && next->op1_type == IS_CV) {
          zend_bitset_incl(def, var_num);
        }
      }
      if (opline->op1_type == IS_CV) {
        goto add_op1_def;
      }
      break;
    case ZEND_ASSIGN_OBJ_REF:
      next = opline + 1;
      if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
        var_num = EX_VAR_TO_NUM(next->op1.var);
        if (!zend_bitset_in(def, var_num)) {
          zend_bitset_incl(use, var_num);
        }
        if (next->op1_type == IS_CV) {
          zend_bitset_incl(def, var_num);
        }
      }
      if (opline->op1_type == IS_CV) {
        goto add_op1_def;
      }
      break;
    case ZEND_ASSIGN_STATIC_PROP:
      next = opline + 1;
      if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
        var_num = EX_VAR_TO_NUM(next->op1.var);
        if (!zend_bitset_in(def, var_num)) {
          zend_bitset_incl(use, var_num);
        }
        if ((build_flags & ZEND_SSA_RC_INFERENCE) && next->op1_type == IS_CV) {
          zend_bitset_incl(def, var_num);
        }
      }
      break;
    case ZEND_ASSIGN_STATIC_PROP_REF:
      next = opline + 1;
      if (next->op1_type & (IS_CV|IS_VAR|IS_TMP_VAR)) {
        var_num = EX_VAR_TO_NUM(next->op1.var);
        if (!zend_bitset_in(def, var_num)) {
          zend_bitset_incl(use, var_num);
        }
        if (next->op1_type == IS_CV) {
          zend_bitset_incl(def, var_num);
        }
      }
      break;
    case ZEND_ASSIGN_STATIC_PROP_OP:
    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(op_array, opline, build_flags, use, def);
}
/* }}} */

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

  set_size = dfg->size;
  tmp = dfg->tmp;
  def = dfg->def;
  use = dfg->use;
  in  = dfg->in;
  out = dfg->out;

  /* Collect "def" and "use" sets */
  for (j = 0; j < blocks_count; j++) {
    zend_op *opline, *end;
    zend_bitset b_use, b_def;

    if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
      continue;
    }

    opline = op_array->opcodes + blocks[j].start;
    end = opline + blocks[j].len;
    b_use = DFG_BITSET(use, set_size, j);
    b_def = DFG_BITSET(def, set_size, j);
    for (; opline < end; opline++) {
      if (opline->opcode != ZEND_OP_DATA) {
        _zend_dfg_add_use_def_op(op_array, opline, build_flags, b_use, b_def);
      }
    }
  }

  /* Calculate "in" and "out" sets */
  {
    uint32_t worklist_len = zend_bitset_len(blocks_count);
    zend_bitset worklist;
    ALLOCA_FLAG(use_heap);
    worklist = ZEND_BITSET_ALLOCA(worklist_len, use_heap);
    memset(worklist, 0, worklist_len * ZEND_BITSET_ELM_SIZE);
    for (j = 0; j < blocks_count; j++) {
      zend_bitset_incl(worklist, j);
    }
    while (!zend_bitset_empty(worklist, worklist_len)) {
      /* We use the last block on the worklist, because predecessors tend to be located
       * before the succeeding block, so this converges faster. */
      j = zend_bitset_last(worklist, worklist_len);
      zend_bitset_excl(worklist, j);

      if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
        continue;
      }
      if (blocks[j].successors_count != 0) {
        zend_bitset_copy(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[0]), set_size);
        for (k = 1; k < blocks[j].successors_count; k++) {
          zend_bitset_union(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[k]), set_size);
        }
      } else {
        zend_bitset_clear(DFG_BITSET(out, set_size, j), set_size);
      }
      zend_bitset_union_with_difference(tmp, DFG_BITSET(use, set_size, j), DFG_BITSET(out, set_size, j), DFG_BITSET(def, set_size, j), set_size);
      if (!zend_bitset_equal(DFG_BITSET(in, set_size, j), tmp, set_size)) {
        zend_bitset_copy(DFG_BITSET(in, set_size, j), tmp, set_size);

        /* Add predecessors of changed block to worklist */
        {
          int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
          for (k = 0; k < blocks[j].predecessors_count; k++) {
            zend_bitset_incl(worklist, predecessors[k]);
          }
        }
      }
    }

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

Coverage Report

Created: 2025-06-13 06:43

Line	Count	Source (jump to first uncovered line)
1		/*
2		+----------------------------------------------------------------------+
3		\| Zend Engine, DFG - Data Flow Graph \|
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		+----------------------------------------------------------------------+
17		*/
18
19		#include "zend_compile.h"
20		#include "zend_dfg.h"
21
22		static zend_always_inline void _zend_dfg_add_use_def_op(const zend_op_array op_array, const zend_op opline, uint32_t build_flags, zend_bitset use, zend_bitset def) /* {{{ */
23	1.33M	{
24	1.33M	uint32_t var_num;
25	1.33M	const zend_op *next;
26
27	1.33M	if (opline->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
28	799k	var_num = EX_VAR_TO_NUM(opline->op1.var);
29	799k	if (!zend_bitset_in(def, var_num)) {
30	243k	zend_bitset_incl(use, var_num);
31	243k	}
32	799k	}
33	1.33M	if (((opline->op2_type & (IS_VAR\|IS_TMP_VAR)) != 0
34	1.33M	&& opline->opcode != ZEND_FE_FETCH_R
35	1.33M	&& opline->opcode != ZEND_FE_FETCH_RW)
36	1.33M	\|\| (opline->op2_type == IS_CV)) {
37	274k	var_num = EX_VAR_TO_NUM(opline->op2.var);
38	274k	if (!zend_bitset_in(def, var_num)) {
39	169k	zend_bitset_incl(use, var_num);
40	169k	}
41	274k	}
42	1.33M	if ((build_flags & ZEND_SSA_USE_CV_RESULTS)
43	1.33M	&& opline->result_type == IS_CV
44	1.33M	&& opline->opcode != ZEND_RECV) {
45	0	var_num = EX_VAR_TO_NUM(opline->result.var);
46	0	if (!zend_bitset_in(def, var_num)) {
47	0	zend_bitset_incl(use, var_num);
48	0	}
49	0	}
50
51	1.33M	switch (opline->opcode) {
52	57.6k	case ZEND_ASSIGN:
53	57.6k	if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op2_type == IS_CV) {
54	0	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
55	0	}
56	57.6k	if (opline->op1_type == IS_CV) {
57	103k	add_op1_def:
58	103k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op1.var));
59	103k	}
60	104k	break;
61	104k	case ZEND_ASSIGN_REF:
62	2.01k	if (opline->op2_type == IS_CV) {
63	957	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
64	957	}
65	2.01k	if (opline->op1_type == IS_CV) {
66	1.53k	goto add_op1_def;
67	1.53k	}
68	476	break;
69	6.76k	case ZEND_ASSIGN_DIM:
70	14.3k	case ZEND_ASSIGN_OBJ:
71	14.3k	next = opline + 1;
72	14.3k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
73	8.03k	var_num = EX_VAR_TO_NUM(next->op1.var);
74	8.03k	if (!zend_bitset_in(def, var_num)) {
75	1.14k	zend_bitset_incl(use, var_num);
76	1.14k	}
77	8.03k	if (build_flags & ZEND_SSA_RC_INFERENCE && next->op1_type == IS_CV) {
78	0	zend_bitset_incl(def, var_num);
79	0	}
80	8.03k	}
81	14.3k	if (opline->op1_type == IS_CV) {
82	8.97k	goto add_op1_def;
83	8.97k	}
84	5.41k	break;
85	5.41k	case ZEND_ASSIGN_OBJ_REF:
86	303	next = opline + 1;
87	303	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
88	303	var_num = EX_VAR_TO_NUM(next->op1.var);
89	303	if (!zend_bitset_in(def, var_num)) {
90	46	zend_bitset_incl(use, var_num);
91	46	}
92	303	if (next->op1_type == IS_CV) {
93	215	zend_bitset_incl(def, var_num);
94	215	}
95	303	}
96	303	if (opline->op1_type == IS_CV) {
97	172	goto add_op1_def;
98	172	}
99	131	break;
100	1.01k	case ZEND_ASSIGN_STATIC_PROP:
101	1.01k	next = opline + 1;
102	1.01k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
103	663	var_num = EX_VAR_TO_NUM(next->op1.var);
104	663	if (!zend_bitset_in(def, var_num)) {
105	346	zend_bitset_incl(use, var_num);
106	346	}
107	663	if ((build_flags & ZEND_SSA_RC_INFERENCE) && next->op1_type == IS_CV) {
108	0	zend_bitset_incl(def, var_num);
109	0	}
110	663	}
111	1.01k	break;
112	110	case ZEND_ASSIGN_STATIC_PROP_REF:
113	110	next = opline + 1;
114	110	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
115	110	var_num = EX_VAR_TO_NUM(next->op1.var);
116	110	if (!zend_bitset_in(def, var_num)) {
117	4	zend_bitset_incl(use, var_num);
118	4	}
119	110	if (next->op1_type == IS_CV) {
120	34	zend_bitset_incl(def, var_num);
121	34	}
122	110	}
123	110	break;
124	12	case ZEND_ASSIGN_STATIC_PROP_OP:
125	12	case ZEND_FRAMELESS_ICALL_3:
126	12	next = opline + 1;
127	12	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
128	12	var_num = EX_VAR_TO_NUM(next->op1.var);
129	12	if (!zend_bitset_in(def, var_num)) {
130	0	zend_bitset_incl(use, var_num);
131	0	}
132	12	}
133	12	break;
134	1.19k	case ZEND_ASSIGN_DIM_OP:
135	1.71k	case ZEND_ASSIGN_OBJ_OP:
136	1.71k	next = opline + 1;
137	1.71k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
138	814	var_num = EX_VAR_TO_NUM(next->op1.var);
139	814	if (!zend_bitset_in(def, var_num)) {
140	79	zend_bitset_incl(use, var_num);
141	79	}
142	814	}
143	1.71k	if (opline->op1_type == IS_CV) {
144	1.22k	goto add_op1_def;
145	1.22k	}
146	497	break;
147	4.66k	case ZEND_ASSIGN_OP:
148	8.77k	case ZEND_PRE_INC:
149	9.27k	case ZEND_PRE_DEC:
150	10.0k	case ZEND_POST_INC:
151	11.2k	case ZEND_POST_DEC:
152	11.9k	case ZEND_BIND_GLOBAL:
153	17.8k	case ZEND_BIND_STATIC:
154	17.9k	case ZEND_BIND_INIT_STATIC_OR_JMP:
155	18.4k	case ZEND_SEND_VAR_NO_REF:
156	21.4k	case ZEND_SEND_VAR_NO_REF_EX:
157	27.6k	case ZEND_SEND_VAR_EX:
158	28.7k	case ZEND_SEND_FUNC_ARG:
159	30.9k	case ZEND_SEND_REF:
160	31.6k	case ZEND_SEND_UNPACK:
161	32.2k	case ZEND_FE_RESET_RW:
162	33.1k	case ZEND_MAKE_REF:
163	33.5k	case ZEND_PRE_INC_OBJ:
164	33.7k	case ZEND_PRE_DEC_OBJ:
165	33.9k	case ZEND_POST_INC_OBJ:
166	34.0k	case ZEND_POST_DEC_OBJ:
167	34.8k	case ZEND_UNSET_DIM:
168	35.6k	case ZEND_UNSET_OBJ:
169	37.7k	case ZEND_FETCH_DIM_W:
170	38.4k	case ZEND_FETCH_DIM_RW:
171	39.1k	case ZEND_FETCH_DIM_FUNC_ARG:
172	39.2k	case ZEND_FETCH_DIM_UNSET:
173	39.5k	case ZEND_FETCH_LIST_W:
174	39.5k	if (opline->op1_type == IS_CV) {
175	31.3k	goto add_op1_def;
176	31.3k	}
177	8.17k	break;
178	32.4k	case ZEND_SEND_VAR:
179	33.5k	case ZEND_CAST:
180	39.8k	case ZEND_QM_ASSIGN:
181	41.0k	case ZEND_JMP_SET:
182	42.2k	case ZEND_COALESCE:
183	44.8k	case ZEND_FE_RESET_R:
184	44.8k	if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op1_type == IS_CV) {
185	0	goto add_op1_def;
186	0	}
187	44.8k	break;
188	44.8k	case ZEND_ADD_ARRAY_UNPACK:
189	150	var_num = EX_VAR_TO_NUM(opline->result.var);
190	150	if (!zend_bitset_in(def, var_num)) {
191	0	zend_bitset_incl(use, var_num);
192	0	}
193	150	break;
194	17.4k	case ZEND_ADD_ARRAY_ELEMENT:
195	17.4k	var_num = EX_VAR_TO_NUM(opline->result.var);
196	17.4k	if (!zend_bitset_in(def, var_num)) {
197	742	zend_bitset_incl(use, var_num);
198	742	}
199	17.4k	ZEND_FALLTHROUGH;
200	21.1k	case ZEND_INIT_ARRAY:
201	21.1k	if (((build_flags & ZEND_SSA_RC_INFERENCE)
202	21.1k	\|\| (opline->extended_value & ZEND_ARRAY_ELEMENT_REF))
203	21.1k	&& opline->op1_type == IS_CV) {
204	203	goto add_op1_def;
205	203	}
206	20.9k	break;
207	20.9k	case ZEND_YIELD:
208	1.83k	if (opline->op1_type == IS_CV
209	1.83k	&& ((op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)
210	385	\|\| (build_flags & ZEND_SSA_RC_INFERENCE))) {
211	52	goto add_op1_def;
212	52	}
213	1.78k	break;
214	1.78k	case ZEND_UNSET_CV:
215	1.58k	goto add_op1_def;
216	3.23k	case ZEND_VERIFY_RETURN_TYPE:
217	3.23k	if (opline->op1_type & (IS_TMP_VAR\|IS_VAR\|IS_CV)) {
218	1.60k	goto add_op1_def;
219	1.60k	}
220	1.63k	break;
221	2.59k	case ZEND_FE_FETCH_R:
222	3.23k	case ZEND_FE_FETCH_RW:
223		#if 0
224		/* This special case was handled above the switch */
225		if (opline->op2_type != IS_CV) {
226		op2_use = -1; /* not used */
227		}
228		#endif
229	3.23k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
230	3.23k	break;
231	5.45k	case ZEND_BIND_LEXICAL:
232	5.45k	if ((opline->extended_value & ZEND_BIND_REF) \|\| (build_flags & ZEND_SSA_RC_INFERENCE)) {
233	480	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
234	480	}
235	5.45k	break;
236	1.13M	default:
237	1.13M	break;
238	1.33M	}
239
240	1.33M	if (opline->result_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
241	737k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->result.var));
242	737k	}
243	1.33M	}
244		/* }}} */
245
246		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) /* {{{ */
247	0	{
248	0	_zend_dfg_add_use_def_op(op_array, opline, build_flags, use, def);
249	0	}
250		/* }}} */
251
252		void zend_build_dfg(const zend_op_array op_array, const zend_cfg cfg, zend_dfg dfg, uint32_t build_flags) / {{{ */
253	74.1k	{
254	74.1k	int set_size;
255	74.1k	zend_basic_block *blocks = cfg->blocks;
256	74.1k	int blocks_count = cfg->blocks_count;
257	74.1k	zend_bitset tmp, def, use, in, out;
258	74.1k	int k;
259	74.1k	int j;
260
261	74.1k	set_size = dfg->size;
262	74.1k	tmp = dfg->tmp;
263	74.1k	def = dfg->def;
264	74.1k	use = dfg->use;
265	74.1k	in = dfg->in;
266	74.1k	out = dfg->out;
267
268		/* Collect "def" and "use" sets */
269	290k	for (j = 0; j < blocks_count; j++) {
270	216k	zend_op opline, end;
271	216k	zend_bitset b_use, b_def;
272
273	216k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
274	32	continue;
275	32	}
276
277	216k	opline = op_array->opcodes + blocks[j].start;
278	216k	end = opline + blocks[j].len;
279	216k	b_use = DFG_BITSET(use, set_size, j);
280	216k	b_def = DFG_BITSET(def, set_size, j);
281	1.56M	for (; opline < end; opline++) {
282	1.34M	if (opline->opcode != ZEND_OP_DATA) {
283	1.33M	_zend_dfg_add_use_def_op(op_array, opline, build_flags, b_use, b_def);
284	1.33M	}
285	1.34M	}
286	216k	}
287
288		/* Calculate "in" and "out" sets */
289	74.1k	{
290	74.1k	uint32_t worklist_len = zend_bitset_len(blocks_count);
291	74.1k	zend_bitset worklist;
292	74.1k	ALLOCA_FLAG(use_heap);
293	74.1k	worklist = ZEND_BITSET_ALLOCA(worklist_len, use_heap);
294	74.1k	memset(worklist, 0, worklist_len * ZEND_BITSET_ELM_SIZE);
295	290k	for (j = 0; j < blocks_count; j++) {
296	216k	zend_bitset_incl(worklist, j);
297	216k	}
298	335k	while (!zend_bitset_empty(worklist, worklist_len)) {
299		/* We use the last block on the worklist, because predecessors tend to be located
300		* before the succeeding block, so this converges faster. */
301	261k	j = zend_bitset_last(worklist, worklist_len);
302	261k	zend_bitset_excl(worklist, j);
303
304	261k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
305	32	continue;
306	32	}
307	261k	if (blocks[j].successors_count != 0) {
308	186k	zend_bitset_copy(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[0]), set_size);
309	279k	for (k = 1; k < blocks[j].successors_count; k++) {
310	93.3k	zend_bitset_union(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[k]), set_size);
311	93.3k	}
312	186k	} else {
313	75.2k	zend_bitset_clear(DFG_BITSET(out, set_size, j), set_size);
314	75.2k	}
315	261k	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);
316	261k	if (!zend_bitset_equal(DFG_BITSET(in, set_size, j), tmp, set_size)) {
317	192k	zend_bitset_copy(DFG_BITSET(in, set_size, j), tmp, set_size);
318
319		/* Add predecessors of changed block to worklist */
320	192k	{
321	192k	int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
322	440k	for (k = 0; k < blocks[j].predecessors_count; k++) {
323	247k	zend_bitset_incl(worklist, predecessors[k]);
324	247k	}
325	192k	}
326	192k	}
327	261k	}
328
329	74.1k	free_alloca(worklist, use_heap);
330	74.1k	}
331	74.1k	}
332		/* }}} */