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

Source
/*
   +----------------------------------------------------------------------+
   | 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_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: 2026-04-01 06:49

Line	Count	Source
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_impl(const zend_op_array op_array, const zend_op opline, uint32_t build_flags, zend_bitset use, zend_bitset def) /* {{{ */
23	1.35M	{
24	1.35M	uint32_t var_num;
25	1.35M	const zend_op *next;
26
27	1.35M	if (opline->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
28	793k	var_num = EX_VAR_TO_NUM(opline->op1.var);
29	793k	if (!zend_bitset_in(def, var_num)) {
30	214k	zend_bitset_incl(use, var_num);
31	214k	}
32	793k	}
33	1.35M	if (((opline->op2_type & (IS_VAR\|IS_TMP_VAR)) != 0
34	112k	&& opline->opcode != ZEND_FE_FETCH_R
35	111k	&& opline->opcode != ZEND_FE_FETCH_RW)
36	1.24M	\|\| (opline->op2_type == IS_CV)) {
37	239k	var_num = EX_VAR_TO_NUM(opline->op2.var);
38	239k	if (!zend_bitset_in(def, var_num)) {
39	143k	zend_bitset_incl(use, var_num);
40	143k	}
41	239k	}
42	1.35M	if ((build_flags & ZEND_SSA_USE_CV_RESULTS)
43	0	&& opline->result_type == IS_CV
44	0	&& 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	1.35M	switch (opline->opcode) {
52	57.7k	case ZEND_ASSIGN:
53	57.7k	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	57.7k	if (opline->op1_type == IS_CV) {
57	105k	add_op1_def:
58	105k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op1.var));
59	105k	}
60	105k	break;
61	105k	case ZEND_ASSIGN_REF:
62	2.17k	if (opline->op2_type == IS_CV) {
63	1.08k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
64	1.08k	}
65	2.17k	if (opline->op1_type == IS_CV) {
66	1.64k	goto add_op1_def;
67	1.64k	}
68	532	break;
69	7.80k	case ZEND_ASSIGN_DIM:
70	16.2k	case ZEND_ASSIGN_OBJ:
71	16.2k	next = opline + 1;
72	16.2k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
73	9.38k	var_num = EX_VAR_TO_NUM(next->op1.var);
74	9.38k	if (!zend_bitset_in(def, var_num)) {
75	1.56k	zend_bitset_incl(use, var_num);
76	1.56k	}
77	9.38k	if (build_flags & ZEND_SSA_RC_INFERENCE && next->op1_type == IS_CV) {
78	0	zend_bitset_incl(def, var_num);
79	0	}
80	9.38k	}
81	16.2k	if (opline->op1_type == IS_CV) {
82	9.90k	goto add_op1_def;
83	9.90k	}
84	6.30k	break;
85	6.30k	case ZEND_ASSIGN_OBJ_REF:
86	316	next = opline + 1;
87	316	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
88	316	var_num = EX_VAR_TO_NUM(next->op1.var);
89	316	if (!zend_bitset_in(def, var_num)) {
90	58	zend_bitset_incl(use, var_num);
91	58	}
92	316	if (next->op1_type == IS_CV) {
93	230	zend_bitset_incl(def, var_num);
94	230	}
95	316	}
96	316	if (opline->op1_type == IS_CV) {
97	140	goto add_op1_def;
98	140	}
99	176	break;
100	880	case ZEND_ASSIGN_STATIC_PROP:
101	880	next = opline + 1;
102	880	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
103	501	var_num = EX_VAR_TO_NUM(next->op1.var);
104	501	if (!zend_bitset_in(def, var_num)) {
105	124	zend_bitset_incl(use, var_num);
106	124	}
107	501	if ((build_flags & ZEND_SSA_RC_INFERENCE) && next->op1_type == IS_CV) {
108	0	zend_bitset_incl(def, var_num);
109	0	}
110	501	}
111	880	break;
112	144	case ZEND_ASSIGN_STATIC_PROP_REF:
113	144	next = opline + 1;
114	144	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
115	144	var_num = EX_VAR_TO_NUM(next->op1.var);
116	144	if (!zend_bitset_in(def, var_num)) {
117	10	zend_bitset_incl(use, var_num);
118	10	}
119	144	if (next->op1_type == IS_CV) {
120	36	zend_bitset_incl(def, var_num);
121	36	}
122	144	}
123	144	break;
124	16	case ZEND_ASSIGN_STATIC_PROP_OP:
125	16	case ZEND_FRAMELESS_ICALL_3:
126	16	next = opline + 1;
127	16	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
128	4	var_num = EX_VAR_TO_NUM(next->op1.var);
129	4	if (!zend_bitset_in(def, var_num)) {
130	0	zend_bitset_incl(use, var_num);
131	0	}
132	4	}
133	16	break;
134	1.17k	case ZEND_ASSIGN_DIM_OP:
135	1.78k	case ZEND_ASSIGN_OBJ_OP:
136	1.78k	next = opline + 1;
137	1.78k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
138	866	var_num = EX_VAR_TO_NUM(next->op1.var);
139	866	if (!zend_bitset_in(def, var_num)) {
140	183	zend_bitset_incl(use, var_num);
141	183	}
142	866	}
143	1.78k	if (opline->op1_type == IS_CV) {
144	1.31k	goto add_op1_def;
145	1.31k	}
146	464	break;
147	4.83k	case ZEND_ASSIGN_OP:
148	9.08k	case ZEND_PRE_INC:
149	9.70k	case ZEND_PRE_DEC:
150	10.5k	case ZEND_POST_INC:
151	11.5k	case ZEND_POST_DEC:
152	12.2k	case ZEND_BIND_GLOBAL:
153	18.5k	case ZEND_BIND_STATIC:
154	18.6k	case ZEND_BIND_INIT_STATIC_OR_JMP:
155	18.9k	case ZEND_SEND_VAR_NO_REF:
156	19.9k	case ZEND_SEND_VAR_NO_REF_EX:
157	25.3k	case ZEND_SEND_VAR_EX:
158	25.9k	case ZEND_SEND_FUNC_ARG:
159	28.0k	case ZEND_SEND_REF:
160	28.6k	case ZEND_SEND_UNPACK:
161	29.4k	case ZEND_FE_RESET_RW:
162	30.2k	case ZEND_MAKE_REF:
163	30.6k	case ZEND_PRE_INC_OBJ:
164	30.8k	case ZEND_PRE_DEC_OBJ:
165	30.8k	case ZEND_POST_INC_OBJ:
166	30.9k	case ZEND_POST_DEC_OBJ:
167	32.1k	case ZEND_UNSET_DIM:
168	32.7k	case ZEND_UNSET_OBJ:
169	35.0k	case ZEND_FETCH_DIM_W:
170	35.6k	case ZEND_FETCH_DIM_RW:
171	35.9k	case ZEND_FETCH_DIM_FUNC_ARG:
172	36.1k	case ZEND_FETCH_DIM_UNSET:
173	36.5k	case ZEND_FETCH_LIST_W:
174	36.5k	if (opline->op1_type == IS_CV) {
175	30.8k	goto add_op1_def;
176	30.8k	}
177	5.70k	break;
178	18.6k	case ZEND_SEND_VAR:
179	20.3k	case ZEND_CAST:
180	29.2k	case ZEND_QM_ASSIGN:
181	30.5k	case ZEND_JMP_SET:
182	33.6k	case ZEND_COALESCE:
183	36.4k	case ZEND_FE_RESET_R:
184	36.4k	if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op1_type == IS_CV) {
185	0	goto add_op1_def;
186	0	}
187	36.4k	break;
188	36.4k	case ZEND_ADD_ARRAY_UNPACK:
189	147	var_num = EX_VAR_TO_NUM(opline->result.var);
190	147	if (!zend_bitset_in(def, var_num)) {
191	0	zend_bitset_incl(use, var_num);
192	0	}
193	147	break;
194	17.6k	case ZEND_ADD_ARRAY_ELEMENT:
195	17.6k	var_num = EX_VAR_TO_NUM(opline->result.var);
196	17.6k	if (!zend_bitset_in(def, var_num)) {
197	774	zend_bitset_incl(use, var_num);
198	774	}
199	17.6k	ZEND_FALLTHROUGH;
200	20.9k	case ZEND_INIT_ARRAY:
201	20.9k	if (((build_flags & ZEND_SSA_RC_INFERENCE)
202	20.9k	\|\| (opline->extended_value & ZEND_ARRAY_ELEMENT_REF))
203	254	&& opline->op1_type == IS_CV) {
204	229	goto add_op1_def;
205	229	}
206	20.7k	break;
207	20.7k	case ZEND_YIELD:
208	1.77k	if (opline->op1_type == IS_CV
209	332	&& ((op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)
210	276	\|\| (build_flags & ZEND_SSA_RC_INFERENCE))) {
211	56	goto add_op1_def;
212	56	}
213	1.71k	break;
214	1.88k	case ZEND_UNSET_CV:
215	1.88k	goto add_op1_def;
216	3.46k	case ZEND_VERIFY_RETURN_TYPE:
217	3.46k	if (opline->op1_type & (IS_TMP_VAR\|IS_VAR\|IS_CV)) {
218	1.75k	goto add_op1_def;
219	1.75k	}
220	1.71k	break;
221	2.81k	case ZEND_FE_FETCH_R:
222	3.53k	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	3.53k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
230	3.53k	break;
231	5.78k	case ZEND_BIND_LEXICAL:
232	5.78k	if ((opline->extended_value & ZEND_BIND_REF) \|\| (build_flags & ZEND_SSA_RC_INFERENCE)) {
233	439	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
234	439	}
235	5.78k	break;
236	1.16M	default:
237	1.16M	break;
238	1.35M	}
239
240	1.35M	if (opline->result_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
241	721k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->result.var));
242	721k	}
243	1.35M	}
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_impl(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, const zend_dfg dfg, uint32_t build_flags) / {{{ */
253	66.4k	{
254	66.4k	uint32_t set_size = dfg->size;
255	66.4k	zend_basic_block *blocks = cfg->blocks;
256	66.4k	uint32_t blocks_count = cfg->blocks_count;
257	66.4k	zend_bitset tmp, def, use, in, out;
258	66.4k	uint32_t j;
259
260	66.4k	tmp = dfg->tmp;
261	66.4k	def = dfg->def;
262	66.4k	use = dfg->use;
263	66.4k	in = dfg->in;
264	66.4k	out = dfg->out;
265
266		/* Collect "def" and "use" sets */
267	260k	for (j = 0; j < blocks_count; j++) {
268	194k	const zend_op opline, end;
269	194k	zend_bitset b_use, b_def;
270
271	194k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
272	24	continue;
273	24	}
274
275	194k	opline = op_array->opcodes + blocks[j].start;
276	194k	end = opline + blocks[j].len;
277	194k	b_use = DFG_BITSET(use, set_size, j);
278	194k	b_def = DFG_BITSET(def, set_size, j);
279	1.57M	for (; opline < end; opline++) {
280	1.37M	if (opline->opcode != ZEND_OP_DATA) {
281	1.35M	zend_dfg_add_use_def_op_impl(op_array, opline, build_flags, b_use, b_def);
282	1.35M	}
283	1.37M	}
284	194k	}
285
286		/* Calculate "in" and "out" sets */
287	66.4k	{
288	66.4k	uint32_t worklist_len = zend_bitset_len(blocks_count);
289	66.4k	zend_bitset worklist;
290	66.4k	ALLOCA_FLAG(use_heap);
291	66.4k	worklist = ZEND_BITSET_ALLOCA(worklist_len, use_heap);
292	66.4k	memset(worklist, 0, worklist_len * ZEND_BITSET_ELM_SIZE);
293	260k	for (j = 0; j < blocks_count; j++) {
294	194k	zend_bitset_incl(worklist, j);
295	194k	}
296	305k	while (!zend_bitset_empty(worklist, worklist_len)) {
297		/* We use the last block on the worklist, because predecessors tend to be located
298		* before the succeeding block, so this converges faster. */
299	239k	j = zend_bitset_last(worklist, worklist_len);
300	239k	zend_bitset_excl(worklist, j);
301
302	239k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
303	24	continue;
304	24	}
305	239k	if (blocks[j].successors_count != 0) {
306	170k	zend_bitset_copy(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[0]), set_size);
307	257k	for (uint32_t k = 1; k < blocks[j].successors_count; k++) {
308	86.9k	zend_bitset_union(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[k]), set_size);
309	86.9k	}
310	170k	} else {
311	68.4k	zend_bitset_clear(DFG_BITSET(out, set_size, j), set_size);
312	68.4k	}
313	239k	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);
314	239k	if (!zend_bitset_equal(DFG_BITSET(in, set_size, j), tmp, set_size)) {
315	173k	zend_bitset_copy(DFG_BITSET(in, set_size, j), tmp, set_size);
316
317		/* Add predecessors of changed block to worklist */
318	173k	{
319	173k	const int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
320	393k	for (uint32_t k = 0; k < blocks[j].predecessors_count; k++) {
321	219k	zend_bitset_incl(worklist, predecessors[k]);
322	219k	}
323	173k	}
324	173k	}
325	239k	}
326
327		free_alloca(worklist, use_heap);
328	66.4k	}
329	66.4k	}
330		/* }}} */