/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;
  int blocks_count = cfg->blocks_count;
  zend_bitset tmp, def, use, in, out;
  int k;
  int 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 (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 (k = 0; k < blocks[j].predecessors_count; k++) {
            zend_bitset_incl(worklist, predecessors[k]);
          }
        }
      }
    }

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

Coverage Report

Created: 2026-02-14 06:52

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	1.24M	{
24	1.24M	uint32_t var_num;
25	1.24M	const zend_op *next;
26
27	1.24M	if (opline->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
28	727k	var_num = EX_VAR_TO_NUM(opline->op1.var);
29	727k	if (!zend_bitset_in(def, var_num)) {
30	196k	zend_bitset_incl(use, var_num);
31	196k	}
32	727k	}
33	1.24M	if (((opline->op2_type & (IS_VAR\|IS_TMP_VAR)) != 0
34	101k	&& opline->opcode != ZEND_FE_FETCH_R
35	100k	&& opline->opcode != ZEND_FE_FETCH_RW)
36	1.14M	\|\| (opline->op2_type == IS_CV)) {
37	215k	var_num = EX_VAR_TO_NUM(opline->op2.var);
38	215k	if (!zend_bitset_in(def, var_num)) {
39	129k	zend_bitset_incl(use, var_num);
40	129k	}
41	215k	}
42	1.24M	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	1.24M	switch (opline->opcode) {
52	50.4k	case ZEND_ASSIGN:
53	50.4k	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	50.4k	if (opline->op1_type == IS_CV) {
57	92.1k	add_op1_def:
58	92.1k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op1.var));
59	92.1k	}
60	92.5k	break;
61	92.5k	case ZEND_ASSIGN_REF:
62	1.91k	if (opline->op2_type == IS_CV) {
63	968	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
64	968	}
65	1.91k	if (opline->op1_type == IS_CV) {
66	1.46k	goto add_op1_def;
67	1.46k	}
68	452	break;
69	6.32k	case ZEND_ASSIGN_DIM:
70	14.0k	case ZEND_ASSIGN_OBJ:
71	14.0k	next = opline + 1;
72	14.0k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
73	8.02k	var_num = EX_VAR_TO_NUM(next->op1.var);
74	8.02k	if (!zend_bitset_in(def, var_num)) {
75	1.35k	zend_bitset_incl(use, var_num);
76	1.35k	}
77	8.02k	if (build_flags & ZEND_SSA_RC_INFERENCE && next->op1_type == IS_CV) {
78	0	zend_bitset_incl(def, var_num);
79	0	}
80	8.02k	}
81	14.0k	if (opline->op1_type == IS_CV) {
82	8.39k	goto add_op1_def;
83	8.39k	}
84	5.68k	break;
85	5.68k	case ZEND_ASSIGN_OBJ_REF:
86	272	next = opline + 1;
87	272	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
88	272	var_num = EX_VAR_TO_NUM(next->op1.var);
89	272	if (!zend_bitset_in(def, var_num)) {
90	46	zend_bitset_incl(use, var_num);
91	46	}
92	272	if (next->op1_type == IS_CV) {
93	206	zend_bitset_incl(def, var_num);
94	206	}
95	272	}
96	272	if (opline->op1_type == IS_CV) {
97	130	goto add_op1_def;
98	130	}
99	142	break;
100	796	case ZEND_ASSIGN_STATIC_PROP:
101	796	next = opline + 1;
102	796	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
103	451	var_num = EX_VAR_TO_NUM(next->op1.var);
104	451	if (!zend_bitset_in(def, var_num)) {
105	108	zend_bitset_incl(use, var_num);
106	108	}
107	451	if ((build_flags & ZEND_SSA_RC_INFERENCE) && next->op1_type == IS_CV) {
108	0	zend_bitset_incl(def, var_num);
109	0	}
110	451	}
111	796	break;
112	104	case ZEND_ASSIGN_STATIC_PROP_REF:
113	104	next = opline + 1;
114	104	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
115	104	var_num = EX_VAR_TO_NUM(next->op1.var);
116	104	if (!zend_bitset_in(def, var_num)) {
117	6	zend_bitset_incl(use, var_num);
118	6	}
119	104	if (next->op1_type == IS_CV) {
120	32	zend_bitset_incl(def, var_num);
121	32	}
122	104	}
123	104	break;
124	8	case ZEND_ASSIGN_STATIC_PROP_OP:
125	8	case ZEND_FRAMELESS_ICALL_3:
126	8	next = opline + 1;
127	8	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
128	2	var_num = EX_VAR_TO_NUM(next->op1.var);
129	2	if (!zend_bitset_in(def, var_num)) {
130	0	zend_bitset_incl(use, var_num);
131	0	}
132	2	}
133	8	break;
134	982	case ZEND_ASSIGN_DIM_OP:
135	1.56k	case ZEND_ASSIGN_OBJ_OP:
136	1.56k	next = opline + 1;
137	1.56k	if (next->op1_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
138	756	var_num = EX_VAR_TO_NUM(next->op1.var);
139	756	if (!zend_bitset_in(def, var_num)) {
140	132	zend_bitset_incl(use, var_num);
141	132	}
142	756	}
143	1.56k	if (opline->op1_type == IS_CV) {
144	1.09k	goto add_op1_def;
145	1.09k	}
146	462	break;
147	4.22k	case ZEND_ASSIGN_OP:
148	7.96k	case ZEND_PRE_INC:
149	8.46k	case ZEND_PRE_DEC:
150	9.14k	case ZEND_POST_INC:
151	9.99k	case ZEND_POST_DEC:
152	10.6k	case ZEND_BIND_GLOBAL:
153	16.6k	case ZEND_BIND_STATIC:
154	16.8k	case ZEND_BIND_INIT_STATIC_OR_JMP:
155	17.0k	case ZEND_SEND_VAR_NO_REF:
156	17.9k	case ZEND_SEND_VAR_NO_REF_EX:
157	22.6k	case ZEND_SEND_VAR_EX:
158	23.3k	case ZEND_SEND_FUNC_ARG:
159	25.1k	case ZEND_SEND_REF:
160	25.7k	case ZEND_SEND_UNPACK:
161	26.3k	case ZEND_FE_RESET_RW:
162	26.9k	case ZEND_MAKE_REF:
163	27.3k	case ZEND_PRE_INC_OBJ:
164	27.5k	case ZEND_PRE_DEC_OBJ:
165	27.6k	case ZEND_POST_INC_OBJ:
166	27.6k	case ZEND_POST_DEC_OBJ:
167	28.6k	case ZEND_UNSET_DIM:
168	29.2k	case ZEND_UNSET_OBJ:
169	31.1k	case ZEND_FETCH_DIM_W:
170	31.7k	case ZEND_FETCH_DIM_RW:
171	32.0k	case ZEND_FETCH_DIM_FUNC_ARG:
172	32.1k	case ZEND_FETCH_DIM_UNSET:
173	32.4k	case ZEND_FETCH_LIST_W:
174	32.4k	if (opline->op1_type == IS_CV) {
175	27.5k	goto add_op1_def;
176	27.5k	}
177	4.90k	break;
178	16.4k	case ZEND_SEND_VAR:
179	17.8k	case ZEND_CAST:
180	25.9k	case ZEND_QM_ASSIGN:
181	27.1k	case ZEND_JMP_SET:
182	29.9k	case ZEND_COALESCE:
183	32.4k	case ZEND_FE_RESET_R:
184	32.4k	if ((build_flags & ZEND_SSA_RC_INFERENCE) && opline->op1_type == IS_CV) {
185	0	goto add_op1_def;
186	0	}
187	32.4k	break;
188	32.4k	case ZEND_ADD_ARRAY_UNPACK:
189	127	var_num = EX_VAR_TO_NUM(opline->result.var);
190	127	if (!zend_bitset_in(def, var_num)) {
191	0	zend_bitset_incl(use, var_num);
192	0	}
193	127	break;
194	14.1k	case ZEND_ADD_ARRAY_ELEMENT:
195	14.1k	var_num = EX_VAR_TO_NUM(opline->result.var);
196	14.1k	if (!zend_bitset_in(def, var_num)) {
197	606	zend_bitset_incl(use, var_num);
198	606	}
199	14.1k	ZEND_FALLTHROUGH;
200	17.1k	case ZEND_INIT_ARRAY:
201	17.1k	if (((build_flags & ZEND_SSA_RC_INFERENCE)
202	17.1k	\|\| (opline->extended_value & ZEND_ARRAY_ELEMENT_REF))
203	204	&& opline->op1_type == IS_CV) {
204	183	goto add_op1_def;
205	183	}
206	16.9k	break;
207	16.9k	case ZEND_YIELD:
208	1.70k	if (opline->op1_type == IS_CV
209	301	&& ((op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)
210	249	\|\| (build_flags & ZEND_SSA_RC_INFERENCE))) {
211	52	goto add_op1_def;
212	52	}
213	1.65k	break;
214	1.68k	case ZEND_UNSET_CV:
215	1.68k	goto add_op1_def;
216	3.28k	case ZEND_VERIFY_RETURN_TYPE:
217	3.28k	if (opline->op1_type & (IS_TMP_VAR\|IS_VAR\|IS_CV)) {
218	1.58k	goto add_op1_def;
219	1.58k	}
220	1.69k	break;
221	2.59k	case ZEND_FE_FETCH_R:
222	3.21k	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	3.21k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
230	3.21k	break;
231	5.54k	case ZEND_BIND_LEXICAL:
232	5.54k	if ((opline->extended_value & ZEND_BIND_REF) \|\| (build_flags & ZEND_SSA_RC_INFERENCE)) {
233	394	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->op2.var));
234	394	}
235	5.54k	break;
236	1.08M	default:
237	1.08M	break;
238	1.24M	}
239
240	1.24M	if (opline->result_type & (IS_CV\|IS_VAR\|IS_TMP_VAR)) {
241	662k	zend_bitset_incl(def, EX_VAR_TO_NUM(opline->result.var));
242	662k	}
243	1.24M	}
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	61.5k	{
254	61.5k	uint32_t set_size = dfg->size;
255	61.5k	zend_basic_block *blocks = cfg->blocks;
256	61.5k	int blocks_count = cfg->blocks_count;
257	61.5k	zend_bitset tmp, def, use, in, out;
258	61.5k	int k;
259	61.5k	int j;
260
261	61.5k	tmp = dfg->tmp;
262	61.5k	def = dfg->def;
263	61.5k	use = dfg->use;
264	61.5k	in = dfg->in;
265	61.5k	out = dfg->out;
266
267		/* Collect "def" and "use" sets */
268	240k	for (j = 0; j < blocks_count; j++) {
269	179k	const zend_op opline, end;
270	179k	zend_bitset b_use, b_def;
271
272	179k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
273	20	continue;
274	20	}
275
276	179k	opline = op_array->opcodes + blocks[j].start;
277	179k	end = opline + blocks[j].len;
278	179k	b_use = DFG_BITSET(use, set_size, j);
279	179k	b_def = DFG_BITSET(def, set_size, j);
280	1.44M	for (; opline < end; opline++) {
281	1.26M	if (opline->opcode != ZEND_OP_DATA) {
282	1.24M	zend_dfg_add_use_def_op_impl(op_array, opline, build_flags, b_use, b_def);
283	1.24M	}
284	1.26M	}
285	179k	}
286
287		/* Calculate "in" and "out" sets */
288	61.5k	{
289	61.5k	uint32_t worklist_len = zend_bitset_len(blocks_count);
290	61.5k	zend_bitset worklist;
291	61.5k	ALLOCA_FLAG(use_heap);
292	61.5k	worklist = ZEND_BITSET_ALLOCA(worklist_len, use_heap);
293	61.5k	memset(worklist, 0, worklist_len * ZEND_BITSET_ELM_SIZE);
294	240k	for (j = 0; j < blocks_count; j++) {
295	179k	zend_bitset_incl(worklist, j);
296	179k	}
297	280k	while (!zend_bitset_empty(worklist, worklist_len)) {
298		/* We use the last block on the worklist, because predecessors tend to be located
299		* before the succeeding block, so this converges faster. */
300	219k	j = zend_bitset_last(worklist, worklist_len);
301	219k	zend_bitset_excl(worklist, j);
302
303	219k	if ((blocks[j].flags & ZEND_BB_REACHABLE) == 0) {
304	20	continue;
305	20	}
306	219k	if (blocks[j].successors_count != 0) {
307	155k	zend_bitset_copy(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[0]), set_size);
308	235k	for (k = 1; k < blocks[j].successors_count; k++) {
309	79.4k	zend_bitset_union(DFG_BITSET(out, set_size, j), DFG_BITSET(in, set_size, blocks[j].successors[k]), set_size);
310	79.4k	}
311	155k	} else {
312	63.4k	zend_bitset_clear(DFG_BITSET(out, set_size, j), set_size);
313	63.4k	}
314	219k	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);
315	219k	if (!zend_bitset_equal(DFG_BITSET(in, set_size, j), tmp, set_size)) {
316	158k	zend_bitset_copy(DFG_BITSET(in, set_size, j), tmp, set_size);
317
318		/* Add predecessors of changed block to worklist */
319	158k	{
320	158k	const int *predecessors = &cfg->predecessors[blocks[j].predecessor_offset];
321	360k	for (k = 0; k < blocks[j].predecessors_count; k++) {
322	201k	zend_bitset_incl(worklist, predecessors[k]);
323	201k	}
324	158k	}
325	158k	}
326	219k	}
327
328		free_alloca(worklist, use_heap);
329	61.5k	}
330	61.5k	}
331		/* }}} */