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

Source
/*
   +----------------------------------------------------------------------+
   | Zend OPcache                                                         |
   +----------------------------------------------------------------------+
   | 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: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Stanislav Malyshev <stas@zend.com>                          |
   |          Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#include "Optimizer/zend_optimizer.h"
#include "Optimizer/zend_optimizer_internal.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_vm.h"
#include "zend_cfg.h"
#include "zend_func_info.h"
#include "zend_call_graph.h"
#include "zend_inference.h"
#include "zend_dump.h"
#include "php.h"

#ifndef ZEND_OPTIMIZER_MAX_REGISTERED_PASSES
# define ZEND_OPTIMIZER_MAX_REGISTERED_PASSES 32
#endif

struct {
  zend_optimizer_pass_t pass[ZEND_OPTIMIZER_MAX_REGISTERED_PASSES];
  int last;
} zend_optimizer_registered_passes = {{NULL}, 0};

void zend_optimizer_collect_constant(zend_optimizer_ctx *ctx, zval *name, zval* value)
{
  if (!ctx->constants) {
    ctx->constants = zend_arena_alloc(&ctx->arena, sizeof(HashTable));
    zend_hash_init(ctx->constants, 16, NULL, zval_ptr_dtor_nogc, 0);
  }

  if (zend_hash_add(ctx->constants, Z_STR_P(name), value)) {
    Z_TRY_ADDREF_P(value);
  }
}

zend_result zend_optimizer_eval_binary_op(zval *result, uint8_t opcode, zval *op1, zval *op2) /* {{{ */
{
  if (zend_binary_op_produces_error(opcode, op1, op2)) {
    return FAILURE;
  }

  binary_op_type binary_op = get_binary_op(opcode);
  return binary_op(result, op1, op2);
}
/* }}} */

zend_result zend_optimizer_eval_unary_op(zval *result, uint8_t opcode, zval *op1) /* {{{ */
{
  unary_op_type unary_op = get_unary_op(opcode);

  if (unary_op) {
    if (zend_unary_op_produces_error(opcode, op1)) {
      return FAILURE;
    }
    return unary_op(result, op1);
  } else { /* ZEND_BOOL */
    if (Z_TYPE_P(op1) == IS_DOUBLE && zend_isnan(Z_DVAL_P(op1))) {
      return FAILURE;
    }
    ZVAL_BOOL(result, zend_is_true(op1));
    return SUCCESS;
  }
}
/* }}} */

zend_result zend_optimizer_eval_cast(zval *result, uint32_t type, zval *op1) /* {{{ */
{
  if (zend_try_ct_eval_cast(result, type, op1)) {
    return SUCCESS;
  }
  return FAILURE;
}
/* }}} */

zend_result zend_optimizer_eval_strlen(zval *result, const zval *op1) /* {{{ */
{
  if (Z_TYPE_P(op1) != IS_STRING) {
    return FAILURE;
  }
  ZVAL_LONG(result, Z_STRLEN_P(op1));
  return SUCCESS;
}
/* }}} */

zend_result zend_optimizer_eval_special_func_call(
    zval *result, zend_string *name, zend_string *arg) {
  if (zend_string_equals_literal(name, "function_exists") ||
      zend_string_equals_literal(name, "is_callable")) {
    zend_string *lc_name = zend_string_tolower(arg);
    zend_internal_function *func = zend_hash_find_ptr(EG(function_table), lc_name);
    zend_string_release_ex(lc_name, 0);

    if (func && func->type == ZEND_INTERNAL_FUNCTION
        && func->module->type == MODULE_PERSISTENT
#ifdef ZEND_WIN32
        && func->module->handle == NULL
#endif
    ) {
      ZVAL_TRUE(result);
      return SUCCESS;
    }
    return FAILURE;
  }
  if (zend_string_equals_literal(name, "extension_loaded")) {
    zend_string *lc_name = zend_string_tolower(arg);
    zend_module_entry *m = zend_hash_find_ptr(&module_registry, lc_name);
    zend_string_release_ex(lc_name, 0);

    if (!m) {
      if (PG(enable_dl)) {
        return FAILURE;
      }
      ZVAL_FALSE(result);
      return SUCCESS;
    }

    if (m->type == MODULE_PERSISTENT
#ifdef ZEND_WIN32
      && m->handle == NULL
#endif
    ) {
      ZVAL_TRUE(result);
      return SUCCESS;
    }
    return FAILURE;
  }
  if (zend_string_equals_literal(name, "constant")) {
    return zend_optimizer_get_persistent_constant(arg, result, 1) ? SUCCESS : FAILURE;
  }
  if (zend_string_equals_literal(name, "dirname")) {
    if (!IS_ABSOLUTE_PATH(ZSTR_VAL(arg), ZSTR_LEN(arg))) {
      return FAILURE;
    }

    zend_string *dirname = zend_string_init(ZSTR_VAL(arg), ZSTR_LEN(arg), 0);
    ZSTR_LEN(dirname) = zend_dirname(ZSTR_VAL(dirname), ZSTR_LEN(dirname));
    if (IS_ABSOLUTE_PATH(ZSTR_VAL(dirname), ZSTR_LEN(dirname))) {
      ZVAL_STR(result, dirname);
      return SUCCESS;
    }
    zend_string_release_ex(dirname, 0);
    return FAILURE;
  }
  if (zend_string_equals_literal(name, "ini_get")) {
    zend_ini_entry *ini_entry = zend_hash_find_ptr(EG(ini_directives), arg);
    if (!ini_entry) {
      if (PG(enable_dl)) {
        return FAILURE;
      }
      ZVAL_FALSE(result);
    } else if (ini_entry->modifiable != ZEND_INI_SYSTEM) {
      return FAILURE;
    } else if (ini_entry->value) {
      ZVAL_STR_COPY(result, ini_entry->value);
    } else {
      ZVAL_EMPTY_STRING(result);
    }
    return SUCCESS;
  }
  return FAILURE;
}

bool zend_optimizer_get_collected_constant(HashTable *constants, zval *name, zval* value)
{
  zval *val;

  if ((val = zend_hash_find(constants, Z_STR_P(name))) != NULL) {
    ZVAL_COPY(value, val);
    return true;
  }
  return false;
}

void zend_optimizer_convert_to_free_op1(zend_op_array *op_array, zend_op *opline)
{
  if (opline->op1_type == IS_CV) {
    opline->opcode = ZEND_CHECK_VAR;
    SET_UNUSED(opline->op2);
    SET_UNUSED(opline->result);
    opline->extended_value = 0;
  } else if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
    opline->opcode = ZEND_FREE;
    SET_UNUSED(opline->op2);
    SET_UNUSED(opline->result);
    opline->extended_value = 0;
  } else {
    ZEND_ASSERT(opline->op1_type == IS_CONST);
    literal_dtor(&ZEND_OP1_LITERAL(opline));
    MAKE_NOP(opline);
  }
}

int zend_optimizer_add_literal(zend_op_array *op_array, const zval *zv)
{
  int i = op_array->last_literal;
  op_array->last_literal++;
  op_array->literals = (zval*)erealloc(op_array->literals, op_array->last_literal * sizeof(zval));
  ZVAL_COPY_VALUE(&op_array->literals[i], zv);
  Z_EXTRA(op_array->literals[i]) = 0;
  return i;
}

static inline int zend_optimizer_add_literal_string(zend_op_array *op_array, zend_string *str) {
  zval zv;
  ZVAL_STR(&zv, str);
  zend_string_hash_val(str);
  return zend_optimizer_add_literal(op_array, &zv);
}

static inline void drop_leading_backslash(zval *val) {
  if (Z_STRVAL_P(val)[0] == '\\') {
    zend_string *str = zend_string_init(Z_STRVAL_P(val) + 1, Z_STRLEN_P(val) - 1, 0);
    zval_ptr_dtor_nogc(val);
    ZVAL_STR(val, str);
  }
}

static inline uint32_t alloc_cache_slots(zend_op_array *op_array, uint32_t num) {
  uint32_t ret = op_array->cache_size;
  op_array->cache_size += num * sizeof(void *);
  return ret;
}

#define REQUIRES_STRING(val) do { \
  if (Z_TYPE_P(val) != IS_STRING) { \
    return 0; \
  } \
} while (0)

#define TO_STRING_NOWARN(val) do { \
  if (Z_TYPE_P(val) >= IS_ARRAY) { \
    return 0; \
  } \
  convert_to_string(val); \
} while (0)

bool zend_optimizer_update_op1_const(zend_op_array *op_array,
                                    zend_op       *opline,
                                    zval          *val)
{
  switch (opline->opcode) {
    case ZEND_OP_DATA:
      switch ((opline-1)->opcode) {
        case ZEND_ASSIGN_OBJ_REF:
        case ZEND_ASSIGN_STATIC_PROP_REF:
          return false;
      }
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      break;
    case ZEND_FREE:
    case ZEND_CHECK_VAR:
      MAKE_NOP(opline);
      zval_ptr_dtor_nogc(val);
      return true;
    case ZEND_SEND_VAR_EX:
    case ZEND_SEND_FUNC_ARG:
    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:
    case ZEND_ASSIGN_DIM:
    case ZEND_RETURN_BY_REF:
    case ZEND_INSTANCEOF:
    case ZEND_MAKE_REF:
    case ZEND_SEPARATE:
    case ZEND_SEND_VAR_NO_REF:
    case ZEND_SEND_VAR_NO_REF_EX:
      return false;
    case ZEND_CATCH:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      opline->extended_value = alloc_cache_slots(op_array, 1) | (opline->extended_value & ZEND_LAST_CATCH);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      break;
    case ZEND_DEFINED:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      opline->extended_value = alloc_cache_slots(op_array, 1);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      break;
    case ZEND_NEW:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      opline->op2.num = alloc_cache_slots(op_array, 1);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      break;
    case ZEND_INIT_STATIC_METHOD_CALL:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      if (opline->op2_type != IS_CONST) {
        opline->result.num = alloc_cache_slots(op_array, 1);
      }
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      break;
    case ZEND_FETCH_CLASS_CONSTANT:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      if (opline->op2_type != IS_CONST) {
        opline->extended_value = alloc_cache_slots(op_array, 1);
      }
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      break;
    case ZEND_ASSIGN_OP:
    case ZEND_ASSIGN_DIM_OP:
    case ZEND_ASSIGN_OBJ_OP:
      break;
    case ZEND_ASSIGN_STATIC_PROP_OP:
    case ZEND_ASSIGN_STATIC_PROP:
    case ZEND_ASSIGN_STATIC_PROP_REF:
    case ZEND_FETCH_STATIC_PROP_R:
    case ZEND_FETCH_STATIC_PROP_W:
    case ZEND_FETCH_STATIC_PROP_RW:
    case ZEND_FETCH_STATIC_PROP_IS:
    case ZEND_FETCH_STATIC_PROP_UNSET:
    case ZEND_FETCH_STATIC_PROP_FUNC_ARG:
    case ZEND_UNSET_STATIC_PROP:
    case ZEND_ISSET_ISEMPTY_STATIC_PROP:
    case ZEND_PRE_INC_STATIC_PROP:
    case ZEND_PRE_DEC_STATIC_PROP:
    case ZEND_POST_INC_STATIC_PROP:
    case ZEND_POST_DEC_STATIC_PROP:
      TO_STRING_NOWARN(val);
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      if (opline->op2_type == IS_CONST && (opline->extended_value & ~ZEND_FETCH_OBJ_FLAGS) + sizeof(void*) == op_array->cache_size) {
        op_array->cache_size += sizeof(void *);
      } else {
        opline->extended_value = alloc_cache_slots(op_array, 3) | (opline->extended_value & ZEND_FETCH_OBJ_FLAGS);
      }
      break;
    case ZEND_SEND_VAR:
      opline->opcode = ZEND_SEND_VAL;
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      break;
    case ZEND_CASE:
      opline->opcode = ZEND_IS_EQUAL;
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      break;
    case ZEND_CASE_STRICT:
      opline->opcode = ZEND_IS_IDENTICAL;
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      break;
    case ZEND_VERIFY_RETURN_TYPE:
      /* This would require a non-local change.
       * zend_optimizer_replace_by_const() supports this. */
      return false;
    case ZEND_COPY_TMP:
    case ZEND_FETCH_CLASS_NAME:
      return false;
    case ZEND_ECHO:
    {
      zval zv;
      if (Z_TYPE_P(val) != IS_STRING && zend_optimizer_eval_cast(&zv, IS_STRING, val) == SUCCESS) {
        zval_ptr_dtor_nogc(val);
        val = &zv;
      }
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      if (Z_TYPE_P(val) == IS_STRING && Z_STRLEN_P(val) == 0) {
        MAKE_NOP(opline);
        return true;
      }
      /* TODO: In a subsequent pass, *after* this step and compacting nops, combine consecutive ZEND_ECHOs using the block information from ssa->cfg */
      /* (e.g. for ext/opcache/tests/opt/sccp_010.phpt) */
      break;
    }
    case ZEND_CONCAT:
    case ZEND_FAST_CONCAT:
    case ZEND_FETCH_R:
    case ZEND_FETCH_W:
    case ZEND_FETCH_RW:
    case ZEND_FETCH_IS:
    case ZEND_FETCH_UNSET:
    case ZEND_FETCH_FUNC_ARG:
    case ZEND_ISSET_ISEMPTY_VAR:
    case ZEND_UNSET_VAR:
      TO_STRING_NOWARN(val);
      if (opline->opcode == ZEND_CONCAT && opline->op2_type == IS_CONST) {
        opline->opcode = ZEND_FAST_CONCAT;
      }
      ZEND_FALLTHROUGH;
    default:
      opline->op1.constant = zend_optimizer_add_literal(op_array, val);
      break;
  }

  opline->op1_type = IS_CONST;
  if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
    zend_string_hash_val(Z_STR(ZEND_OP1_LITERAL(opline)));
  }
  return true;
}

bool zend_optimizer_update_op2_const(zend_op_array *op_array,
                                    zend_op       *opline,
                                    zval          *val)
{
  zval tmp;

  switch (opline->opcode) {
    case ZEND_ASSIGN_REF:
    case ZEND_FAST_CALL:
      return false;
    case ZEND_FETCH_CLASS:
    case ZEND_INSTANCEOF:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      opline->extended_value = alloc_cache_slots(op_array, 1);
      break;
    case ZEND_INIT_FCALL_BY_NAME:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      opline->result.num = alloc_cache_slots(op_array, 1);
      break;
    case ZEND_ASSIGN_STATIC_PROP:
    case ZEND_ASSIGN_STATIC_PROP_REF:
    case ZEND_FETCH_STATIC_PROP_R:
    case ZEND_FETCH_STATIC_PROP_W:
    case ZEND_FETCH_STATIC_PROP_RW:
    case ZEND_FETCH_STATIC_PROP_IS:
    case ZEND_FETCH_STATIC_PROP_UNSET:
    case ZEND_FETCH_STATIC_PROP_FUNC_ARG:
    case ZEND_UNSET_STATIC_PROP:
    case ZEND_ISSET_ISEMPTY_STATIC_PROP:
    case ZEND_PRE_INC_STATIC_PROP:
    case ZEND_PRE_DEC_STATIC_PROP:
    case ZEND_POST_INC_STATIC_PROP:
    case ZEND_POST_DEC_STATIC_PROP:
    case ZEND_ASSIGN_STATIC_PROP_OP:
      REQUIRES_STRING(val);
      drop_leading_backslash(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      if (opline->op1_type != IS_CONST) {
        opline->extended_value = alloc_cache_slots(op_array, 1) | (opline->extended_value & (ZEND_RETURNS_FUNCTION|ZEND_ISEMPTY|ZEND_FETCH_OBJ_FLAGS));
      }
      break;
    case ZEND_INIT_FCALL:
      REQUIRES_STRING(val);
      if (Z_REFCOUNT_P(val) == 1) {
        zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
      } else {
        ZVAL_STR(&tmp, zend_string_tolower(Z_STR_P(val)));
        zval_ptr_dtor_nogc(val);
        val = &tmp;
      }
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      opline->result.num = alloc_cache_slots(op_array, 1);
      break;
    case ZEND_INIT_DYNAMIC_CALL:
      if (Z_TYPE_P(val) == IS_STRING) {
        if (zend_memrchr(Z_STRVAL_P(val), ':', Z_STRLEN_P(val))) {
          return false;
        }

        if (zend_optimizer_classify_function(Z_STR_P(val), opline->extended_value)) {
          /* Dynamic call to various special functions must stay dynamic,
           * otherwise would drop a warning */
          return false;
        }

        opline->opcode = ZEND_INIT_FCALL_BY_NAME;
        drop_leading_backslash(val);
        opline->op2.constant = zend_optimizer_add_literal(op_array, val);
        zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
        opline->result.num = alloc_cache_slots(op_array, 1);
      } else {
        opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      }
      break;
    case ZEND_INIT_METHOD_CALL:
      REQUIRES_STRING(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      opline->result.num = alloc_cache_slots(op_array, 2);
      break;
    case ZEND_INIT_STATIC_METHOD_CALL:
      REQUIRES_STRING(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
      if (opline->op1_type != IS_CONST) {
        opline->result.num = alloc_cache_slots(op_array, 2);
      }
      break;
    case ZEND_ASSIGN_OBJ:
    case ZEND_ASSIGN_OBJ_REF:
    case ZEND_FETCH_OBJ_R:
    case ZEND_FETCH_OBJ_W:
    case ZEND_FETCH_OBJ_RW:
    case ZEND_FETCH_OBJ_IS:
    case ZEND_FETCH_OBJ_UNSET:
    case ZEND_FETCH_OBJ_FUNC_ARG:
    case ZEND_UNSET_OBJ:
    case ZEND_PRE_INC_OBJ:
    case ZEND_PRE_DEC_OBJ:
    case ZEND_POST_INC_OBJ:
    case ZEND_POST_DEC_OBJ:
      TO_STRING_NOWARN(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      opline->extended_value = alloc_cache_slots(op_array, 3);
      break;
    case ZEND_ASSIGN_OBJ_OP:
      TO_STRING_NOWARN(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      ZEND_ASSERT((opline + 1)->opcode == ZEND_OP_DATA);
      (opline + 1)->extended_value = alloc_cache_slots(op_array, 3);
      break;
    case ZEND_ISSET_ISEMPTY_PROP_OBJ:
      TO_STRING_NOWARN(val);
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      opline->extended_value = alloc_cache_slots(op_array, 3) | (opline->extended_value & ZEND_ISEMPTY);
      break;
    case ZEND_ASSIGN_DIM_OP:
    case ZEND_ISSET_ISEMPTY_DIM_OBJ:
    case ZEND_ASSIGN_DIM:
    case ZEND_UNSET_DIM:
    case ZEND_FETCH_DIM_R:
    case ZEND_FETCH_DIM_W:
    case ZEND_FETCH_DIM_RW:
    case ZEND_FETCH_DIM_IS:
    case ZEND_FETCH_DIM_FUNC_ARG:
    case ZEND_FETCH_DIM_UNSET:
    case ZEND_FETCH_LIST_R:
    case ZEND_FETCH_LIST_W:
      if (Z_TYPE_P(val) == IS_STRING) {
        zend_ulong index;

        if (ZEND_HANDLE_NUMERIC(Z_STR_P(val), index)) {
          ZVAL_LONG(&tmp, index);
          opline->op2.constant = zend_optimizer_add_literal(op_array, &tmp);
          zend_string_hash_val(Z_STR_P(val));
          zend_optimizer_add_literal(op_array, val);
          Z_EXTRA(op_array->literals[opline->op2.constant]) = ZEND_EXTRA_VALUE;
          break;
        }
      }
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      break;
    case ZEND_ADD_ARRAY_ELEMENT:
    case ZEND_INIT_ARRAY:
      if (Z_TYPE_P(val) == IS_STRING) {
        zend_ulong index;
        if (ZEND_HANDLE_NUMERIC(Z_STR_P(val), index)) {
          zval_ptr_dtor_nogc(val);
          ZVAL_LONG(val, index);
        }
      }
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      break;
    case ZEND_ROPE_INIT:
    case ZEND_ROPE_ADD:
    case ZEND_ROPE_END:
    case ZEND_CONCAT:
    case ZEND_FAST_CONCAT:
      TO_STRING_NOWARN(val);
      if (opline->opcode == ZEND_CONCAT && opline->op1_type == IS_CONST) {
        opline->opcode = ZEND_FAST_CONCAT;
      }
      ZEND_FALLTHROUGH;
    default:
      opline->op2.constant = zend_optimizer_add_literal(op_array, val);
      break;
  }

  opline->op2_type = IS_CONST;
  if (Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
    zend_string_hash_val(Z_STR(ZEND_OP2_LITERAL(opline)));
  }
  return true;
}

bool zend_optimizer_replace_by_const(zend_op_array *op_array,
                                    zend_op       *opline,
                                    uint8_t        type,
                                    uint32_t       var,
                                    zval          *val)
{
  zend_op *end = op_array->opcodes + op_array->last;

  while (opline < end) {
    if (opline->op1_type == type &&
      opline->op1.var == var) {
      switch (opline->opcode) {
        /* In most cases IS_TMP_VAR operand may be used only once.
         * The operands are usually destroyed by the opcode handler.
         * However, there are some exception which keep the operand alive. In that case
         * we want to try to replace all uses of the temporary.
         */
        case ZEND_FETCH_LIST_R:
        case ZEND_CASE:
        case ZEND_CASE_STRICT:
        case ZEND_SWITCH_LONG:
        case ZEND_SWITCH_STRING:
        case ZEND_MATCH:
        case ZEND_MATCH_ERROR:
        case ZEND_JMP_NULL: {
          zend_op *end = op_array->opcodes + op_array->last;
          while (opline < end) {
            if (opline->op1_type == type && opline->op1.var == var) {
              /* If this opcode doesn't keep the operand alive, we're done. Check
               * this early, because op replacement may modify the opline. */
              bool is_last = opline->opcode != ZEND_FETCH_LIST_R
                && opline->opcode != ZEND_CASE
                && opline->opcode != ZEND_CASE_STRICT
                && opline->opcode != ZEND_SWITCH_LONG
                && opline->opcode != ZEND_SWITCH_STRING
                && opline->opcode != ZEND_MATCH
                && opline->opcode != ZEND_MATCH_ERROR
                && opline->opcode != ZEND_JMP_NULL
                && (opline->opcode != ZEND_FREE
                  || opline->extended_value != ZEND_FREE_ON_RETURN);

              Z_TRY_ADDREF_P(val);
              if (!zend_optimizer_update_op1_const(op_array, opline, val)) {
                zval_ptr_dtor(val);
                return false;
              }
              if (is_last) {
                break;
              }
            }
            opline++;
          }
          zval_ptr_dtor_nogc(val);
          return true;
        }
        case ZEND_VERIFY_RETURN_TYPE: {
          zend_arg_info *ret_info = op_array->arg_info - 1;
          if (!ZEND_TYPE_CONTAINS_CODE(ret_info->type, Z_TYPE_P(val))
            || (op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)) {
            return false;
          }
          MAKE_NOP(opline);

          /* zend_handle_loops_and_finally may inserts other oplines */
          do {
            ++opline;
          } while (opline->opcode != ZEND_RETURN && opline->opcode != ZEND_RETURN_BY_REF);
          ZEND_ASSERT(opline->op1.var == var);

          break;
        }
        default:
          break;
      }
      return zend_optimizer_update_op1_const(op_array, opline, val);
    }

    if (opline->op2_type == type &&
      opline->op2.var == var) {
      return zend_optimizer_update_op2_const(op_array, opline, val);
    }
    opline++;
  }

  return true;
}

/* Update jump offsets after a jump was migrated to another opline */
void zend_optimizer_migrate_jump(zend_op_array *op_array, zend_op *new_opline, zend_op *opline) {
  switch (new_opline->opcode) {
    case ZEND_JMP:
    case ZEND_FAST_CALL:
      ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op1, ZEND_OP1_JMP_ADDR(opline));
      break;
    case ZEND_JMPZ:
    case ZEND_JMPNZ:
    case ZEND_JMPZ_EX:
    case ZEND_JMPNZ_EX:
    case ZEND_FE_RESET_R:
    case ZEND_FE_RESET_RW:
    case ZEND_JMP_SET:
    case ZEND_COALESCE:
    case ZEND_ASSERT_CHECK:
    case ZEND_JMP_NULL:
    case ZEND_BIND_INIT_STATIC_OR_JMP:
    case ZEND_JMP_FRAMELESS:
      ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op2, ZEND_OP2_JMP_ADDR(opline));
      break;
    case ZEND_FE_FETCH_R:
    case ZEND_FE_FETCH_RW:
      new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
      break;
    case ZEND_CATCH:
      if (!(opline->extended_value & ZEND_LAST_CATCH)) {
        ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op2, ZEND_OP2_JMP_ADDR(opline));
      }
      break;
    case ZEND_SWITCH_LONG:
    case ZEND_SWITCH_STRING:
    case ZEND_MATCH:
    {
      HashTable *jumptable = Z_ARRVAL(ZEND_OP2_LITERAL(opline));
      zval *zv;
      ZEND_HASH_FOREACH_VAL(jumptable, zv) {
        Z_LVAL_P(zv) = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv)));
      } ZEND_HASH_FOREACH_END();
      new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
      break;
    }
  }
}

/* Shift jump offsets based on shiftlist */
void zend_optimizer_shift_jump(zend_op_array *op_array, zend_op *opline, uint32_t *shiftlist) {
  switch (opline->opcode) {
    case ZEND_JMP:
    case ZEND_FAST_CALL:
      ZEND_SET_OP_JMP_ADDR(opline, opline->op1, ZEND_OP1_JMP_ADDR(opline) - shiftlist[ZEND_OP1_JMP_ADDR(opline) - op_array->opcodes]);
      break;
    case ZEND_JMPZ:
    case ZEND_JMPNZ:
    case ZEND_JMPZ_EX:
    case ZEND_JMPNZ_EX:
    case ZEND_FE_RESET_R:
    case ZEND_FE_RESET_RW:
    case ZEND_JMP_SET:
    case ZEND_COALESCE:
    case ZEND_ASSERT_CHECK:
    case ZEND_JMP_NULL:
    case ZEND_BIND_INIT_STATIC_OR_JMP:
    case ZEND_JMP_FRAMELESS:
      ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(opline) - shiftlist[ZEND_OP2_JMP_ADDR(opline) - op_array->opcodes]);
      break;
    case ZEND_CATCH:
      if (!(opline->extended_value & ZEND_LAST_CATCH)) {
        ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(opline) - shiftlist[ZEND_OP2_JMP_ADDR(opline) - op_array->opcodes]);
      }
      break;
    case ZEND_FE_FETCH_R:
    case ZEND_FE_FETCH_RW:
      opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
      break;
    case ZEND_SWITCH_LONG:
    case ZEND_SWITCH_STRING:
    case ZEND_MATCH:
    {
      HashTable *jumptable = Z_ARRVAL(ZEND_OP2_LITERAL(opline));
      zval *zv;
      ZEND_HASH_FOREACH_VAL(jumptable, zv) {
        Z_LVAL_P(zv) = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv)) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv))]);
      } ZEND_HASH_FOREACH_END();
      opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
      break;
    }
  }
}

static bool zend_optimizer_ignore_class(zval *ce_zv, zend_string *filename)
{
  zend_class_entry *ce = Z_PTR_P(ce_zv);

  if (ce->ce_flags & ZEND_ACC_PRELOADED) {
    Bucket *ce_bucket = (Bucket*)((uintptr_t)ce_zv - XtOffsetOf(Bucket, val));
    size_t offset = ce_bucket - EG(class_table)->arData;
    if (offset < EG(persistent_classes_count)) {
      return false;
    }
  }
  return ce->type == ZEND_USER_CLASS
    && (!ce->info.user.filename || ce->info.user.filename != filename);
}

static bool zend_optimizer_ignore_function(zval *fbc_zv, zend_string *filename)
{
  zend_function *fbc = Z_PTR_P(fbc_zv);

  if (fbc->type == ZEND_INTERNAL_FUNCTION) {
    return false;
  } else if (fbc->type == ZEND_USER_FUNCTION) {
    if (fbc->op_array.fn_flags & ZEND_ACC_PRELOADED) {
      Bucket *fbc_bucket = (Bucket*)((uintptr_t)fbc_zv - XtOffsetOf(Bucket, val));
      size_t offset = fbc_bucket - EG(function_table)->arData;
      if (offset < EG(persistent_functions_count)) {
        return false;
      }
    }
    return !fbc->op_array.filename || fbc->op_array.filename != filename;
  } else {
    ZEND_ASSERT(fbc->type == ZEND_EVAL_CODE);
    return true;
  }
}

zend_class_entry *zend_optimizer_get_class_entry(
    const zend_script *script, const zend_op_array *op_array, zend_string *lcname) {
  zend_class_entry *ce = script ? zend_hash_find_ptr(&script->class_table, lcname) : NULL;
  if (ce) {
    return ce;
  }

  zval *ce_zv = zend_hash_find(CG(class_table), lcname);
  if (ce_zv && !zend_optimizer_ignore_class(ce_zv, op_array ? op_array->filename : NULL)) {
    return Z_PTR_P(ce_zv);
  }

  if (op_array && op_array->scope && zend_string_equals_ci(op_array->scope->name, lcname)) {
    return op_array->scope;
  }

  return NULL;
}

zend_class_entry *zend_optimizer_get_class_entry_from_op1(
    const zend_script *script, const zend_op_array *op_array, const zend_op *opline) {
  if (opline->op1_type == IS_CONST) {
    zval *op1 = CRT_CONSTANT(opline->op1);
    if (Z_TYPE_P(op1) == IS_STRING) {
      return zend_optimizer_get_class_entry(script, op_array, Z_STR_P(op1 + 1));
    }
  } else if (opline->op1_type == IS_UNUSED && op_array->scope
      && !(op_array->scope->ce_flags & ZEND_ACC_TRAIT)
      && ((opline->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_SELF
        || ((opline->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_STATIC
          && (op_array->scope->ce_flags & ZEND_ACC_FINAL)))) {
    return op_array->scope;
  }
  return NULL;
}

const zend_class_constant *zend_fetch_class_const_info(
  const zend_script *script, const zend_op_array *op_array, const zend_op *opline, bool *is_prototype) {
  const zend_class_entry *ce = NULL;
  bool is_static_reference = false;

  if (!opline || !op_array || opline->op2_type != IS_CONST || Z_TYPE_P(CRT_CONSTANT(opline->op2)) != IS_STRING) {
    return NULL;
  }
  if (opline->op1_type == IS_CONST) {
    zval *op1 = CRT_CONSTANT(opline->op1);
    if (Z_TYPE_P(op1) == IS_STRING) {
      if (script) {
        ce = zend_optimizer_get_class_entry(script, op_array, Z_STR_P(op1 + 1));
      } else {
        zval *ce_zv = zend_hash_find(EG(class_table), Z_STR_P(op1 + 1));
        if (ce_zv && !zend_optimizer_ignore_class(ce_zv, op_array->filename)) {
          ce = Z_PTR_P(ce_zv);
        }
      }
    }
  } else if (opline->op1_type == IS_UNUSED
    && op_array->scope && !(op_array->scope->ce_flags & ZEND_ACC_TRAIT)
    && !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)) {
    int fetch_type = opline->op1.num & ZEND_FETCH_CLASS_MASK;
    if (fetch_type == ZEND_FETCH_CLASS_SELF) {
      ce = op_array->scope;
    } else if (fetch_type == ZEND_FETCH_CLASS_STATIC) {
      ce = op_array->scope;
      is_static_reference = true;
    } else if (fetch_type == ZEND_FETCH_CLASS_PARENT) {
      if (op_array->scope->ce_flags & ZEND_ACC_LINKED) {
        ce = op_array->scope->parent;
      }
    }
  }
  if (!ce || (ce->ce_flags & ZEND_ACC_TRAIT)) {
    return NULL;
  }
  zend_class_constant *const_info = zend_hash_find_ptr(&ce->constants_table, Z_STR_P(CRT_CONSTANT(opline->op2)));
  if (!const_info) {
    return NULL;
  }
  if ((ZEND_CLASS_CONST_FLAGS(const_info) & ZEND_ACC_DEPRECATED)
    || ((ZEND_CLASS_CONST_FLAGS(const_info) & ZEND_ACC_PPP_MASK) != ZEND_ACC_PUBLIC && const_info->ce != op_array->scope)) {
    return NULL;
  }
  *is_prototype = is_static_reference
    && !(const_info->ce->ce_flags & ZEND_ACC_FINAL) && !(ZEND_CLASS_CONST_FLAGS(const_info) & ZEND_ACC_FINAL);

  return const_info;
}

zend_function *zend_optimizer_get_called_func(
    zend_script *script, zend_op_array *op_array, zend_op *opline, bool *is_prototype)
{
  *is_prototype = false;
  switch (opline->opcode) {
    case ZEND_INIT_FCALL:
    {
      zend_string *function_name = Z_STR_P(CRT_CONSTANT(opline->op2));
      zend_function *func;
      zval *func_zv;
      if (script && (func = zend_hash_find_ptr(&script->function_table, function_name)) != NULL) {
        return func;
      } else if ((func_zv = zend_hash_find(EG(function_table), function_name)) != NULL) {
        if (!zend_optimizer_ignore_function(func_zv, op_array->filename)) {
          return Z_PTR_P(func_zv);
        }
      }
      break;
    }
    case ZEND_INIT_FCALL_BY_NAME:
    case ZEND_INIT_NS_FCALL_BY_NAME:
      if (opline->op2_type == IS_CONST && Z_TYPE_P(CRT_CONSTANT(opline->op2)) == IS_STRING) {
        zval *function_name = CRT_CONSTANT(opline->op2) + 1;
        zend_function *func;
        zval *func_zv;
        if (script && (func = zend_hash_find_ptr(&script->function_table, Z_STR_P(function_name)))) {
          return func;
        } else if ((func_zv = zend_hash_find(EG(function_table), Z_STR_P(function_name))) != NULL) {
          if (!zend_optimizer_ignore_function(func_zv, op_array->filename)) {
            return Z_PTR_P(func_zv);
          }
        }
      }
      break;
    case ZEND_INIT_STATIC_METHOD_CALL:
      if (opline->op2_type == IS_CONST && Z_TYPE_P(CRT_CONSTANT(opline->op2)) == IS_STRING) {
        zend_class_entry *ce = zend_optimizer_get_class_entry_from_op1(
          script, op_array, opline);
        if (ce) {
          zend_string *func_name = Z_STR_P(CRT_CONSTANT(opline->op2) + 1);
          zend_function *fbc = zend_hash_find_ptr(&ce->function_table, func_name);
          if (fbc) {
            bool is_public = (fbc->common.fn_flags & ZEND_ACC_PUBLIC) != 0;
            bool same_scope = fbc->common.scope == op_array->scope;
            if (is_public || same_scope) {
              return fbc;
            }
          }
        }
      }
      break;
    case ZEND_INIT_METHOD_CALL:
      if (opline->op1_type == IS_UNUSED
          && opline->op2_type == IS_CONST && Z_TYPE_P(CRT_CONSTANT(opline->op2)) == IS_STRING
          && op_array->scope
          && !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)
          && !(op_array->scope->ce_flags & ZEND_ACC_TRAIT)) {
        zend_string *method_name = Z_STR_P(CRT_CONSTANT(opline->op2) + 1);
        zend_function *fbc = zend_hash_find_ptr(
          &op_array->scope->function_table, method_name);
        if (fbc) {
          bool is_private = (fbc->common.fn_flags & ZEND_ACC_PRIVATE) != 0;
          if (is_private) {
            /* Only use private method if in the same scope. We can't even use it
             * as a prototype, as it may be overridden with changed signature. */
            bool same_scope = fbc->common.scope == op_array->scope;
            return same_scope ? fbc : NULL;
          }
          /* Prototype methods are potentially overridden. fbc still contains useful type information.
           * Some optimizations may not be applied, like inlining or inferring the send-mode of superfluous args.
           * A method cannot be overridden if the class or method is final. */
          if ((fbc->common.fn_flags & ZEND_ACC_FINAL) == 0 &&
            (fbc->common.scope->ce_flags & ZEND_ACC_FINAL) == 0) {
            *is_prototype = true;
          }
          return fbc;
        }
      }
      break;
    case ZEND_INIT_PARENT_PROPERTY_HOOK_CALL: {
      zend_class_entry *scope = op_array->scope;
      ZEND_ASSERT(scope != NULL);
      if ((scope->ce_flags & ZEND_ACC_LINKED) && scope->parent) {
        zend_class_entry *parent_scope = scope->parent;
        zend_string *prop_name = Z_STR_P(CRT_CONSTANT(opline->op1));
        zend_property_hook_kind hook_kind = opline->op2.num;
        zend_property_info *prop_info = zend_get_property_info(parent_scope, prop_name, /* silent */ true);

        if (prop_info
          && prop_info != ZEND_WRONG_PROPERTY_INFO
          && !(prop_info->flags & ZEND_ACC_PRIVATE)
          && prop_info->hooks) {
          zend_function *fbc = prop_info->hooks[hook_kind];
          if (fbc) {
            *is_prototype = false;
            return fbc;
          }
        }
      }
      break;
    }
    case ZEND_NEW:
    {
      zend_class_entry *ce = zend_optimizer_get_class_entry_from_op1(
        script, op_array, opline);
      if (ce && ce->type == ZEND_USER_CLASS) {
        return ce->constructor;
      }
      break;
    }
  }
  return NULL;
}

uint32_t zend_optimizer_classify_function(zend_string *name, uint32_t num_args) {
  if (zend_string_equals_literal(name, "extract")) {
    return ZEND_FUNC_INDIRECT_VAR_ACCESS;
  } else if (zend_string_equals_literal(name, "compact")) {
    return ZEND_FUNC_INDIRECT_VAR_ACCESS;
  } else if (zend_string_equals_literal(name, "get_defined_vars")) {
    return ZEND_FUNC_INDIRECT_VAR_ACCESS;
  } else if (zend_string_equals_literal(name, "db2_execute")) {
    return ZEND_FUNC_INDIRECT_VAR_ACCESS;
  } else if (zend_string_equals_literal(name, "func_num_args")) {
    return ZEND_FUNC_VARARG;
  } else if (zend_string_equals_literal(name, "func_get_arg")) {
    return ZEND_FUNC_VARARG;
  } else if (zend_string_equals_literal(name, "func_get_args")) {
    return ZEND_FUNC_VARARG;
  } else {
    return 0;
  }
}

zend_op *zend_optimizer_get_loop_var_def(const zend_op_array *op_array, zend_op *free_opline) {
  uint32_t var = free_opline->op1.var;
  ZEND_ASSERT(zend_optimizer_is_loop_var_free(free_opline));

  while (--free_opline >= op_array->opcodes) {
    if ((free_opline->result_type & (IS_TMP_VAR|IS_VAR)) && free_opline->result.var == var) {
      return free_opline;
    }
  }
  return NULL;
}

static void zend_optimize(zend_op_array      *op_array,
                          zend_optimizer_ctx *ctx)
{
  if (op_array->type == ZEND_EVAL_CODE) {
    return;
  }

  if (ctx->debug_level & ZEND_DUMP_BEFORE_OPTIMIZER) {
    zend_dump_op_array(op_array, ZEND_DUMP_LIVE_RANGES, "before optimizer", NULL);
  }

  /* pass 1 (Simple local optimizations)
   * - persistent constant substitution (true, false, null, etc)
   * - constant casting (ADD expects numbers, CONCAT strings, etc)
   * - constant expression evaluation
   * - optimize constant conditional JMPs
   * - pre-evaluate constant function calls
   * - eliminate FETCH $GLOBALS followed by FETCH_DIM/UNSET_DIM/ISSET_ISEMPTY_DIM
   */
  if (ZEND_OPTIMIZER_PASS_1 & ctx->optimization_level) {
    zend_optimizer_pass1(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_1) {
      zend_dump_op_array(op_array, 0, "after pass 1", NULL);
    }
  }

  /* pass 3: (Jump optimization)
   * - optimize series of JMPs
   */
  if (ZEND_OPTIMIZER_PASS_3 & ctx->optimization_level) {
    zend_optimizer_pass3(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_3) {
      zend_dump_op_array(op_array, 0, "after pass 3", NULL);
    }
  }

  /* pass 4:
   * - INIT_FCALL_BY_NAME -> DO_FCALL
   */
  if (ZEND_OPTIMIZER_PASS_4 & ctx->optimization_level) {
    zend_optimize_func_calls(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_4) {
      zend_dump_op_array(op_array, 0, "after pass 4", NULL);
    }
  }

  /* pass 5:
   * - CFG optimization
   */
  if (ZEND_OPTIMIZER_PASS_5 & ctx->optimization_level) {
    zend_optimize_cfg(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_5) {
      zend_dump_op_array(op_array, 0, "after pass 5", NULL);
    }
  }

  /* pass 6:
   * - DFA optimization
   */
  if ((ZEND_OPTIMIZER_PASS_6 & ctx->optimization_level) &&
      !(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level)) {
    zend_optimize_dfa(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_6) {
      zend_dump_op_array(op_array, 0, "after pass 6", NULL);
    }
  }

  /* pass 9:
   * - Optimize temp variables usage
   */
  if ((ZEND_OPTIMIZER_PASS_9 & ctx->optimization_level) &&
      !(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level)) {
    zend_optimize_temporary_variables(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_9) {
      zend_dump_op_array(op_array, 0, "after pass 9", NULL);
    }
  }

  /* pass 10:
   * - remove NOPs
   */
  if (((ZEND_OPTIMIZER_PASS_10|ZEND_OPTIMIZER_PASS_5) & ctx->optimization_level) == ZEND_OPTIMIZER_PASS_10) {
    zend_optimizer_nop_removal(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_10) {
      zend_dump_op_array(op_array, 0, "after pass 10", NULL);
    }
  }

  /* pass 11:
   * - Compact literals table
   */
  if ((ZEND_OPTIMIZER_PASS_11 & ctx->optimization_level) &&
      (!(ZEND_OPTIMIZER_PASS_6 & ctx->optimization_level) ||
       !(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level))) {
    zend_optimizer_compact_literals(op_array, ctx);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_11) {
      zend_dump_op_array(op_array, 0, "after pass 11", NULL);
    }
  }

  if ((ZEND_OPTIMIZER_PASS_13 & ctx->optimization_level) &&
      (!(ZEND_OPTIMIZER_PASS_6 & ctx->optimization_level) ||
       !(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level))) {
    zend_optimizer_compact_vars(op_array);
    if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_13) {
      zend_dump_op_array(op_array, 0, "after pass 13", NULL);
    }
  }

  if (ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level) {
    return;
  }

  if (ctx->debug_level & ZEND_DUMP_AFTER_OPTIMIZER) {
    zend_dump_op_array(op_array, 0, "after optimizer", NULL);
  }
}

static void zend_revert_pass_two(zend_op_array *op_array)
{
  zend_op *opline, *end;

  ZEND_ASSERT((op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) != 0);

  opline = op_array->opcodes;
  end = opline + op_array->last;
  while (opline < end) {
    if (opline->op1_type == IS_CONST) {
      ZEND_PASS_TWO_UNDO_CONSTANT(op_array, opline, opline->op1);
    }
    if (opline->op2_type == IS_CONST) {
      ZEND_PASS_TWO_UNDO_CONSTANT(op_array, opline, opline->op2);
    }
    /* reset smart branch flags IS_SMART_BRANCH_JMP[N]Z */
    opline->result_type &= (IS_TMP_VAR|IS_VAR|IS_CV|IS_CONST);
    opline++;
  }
#if !ZEND_USE_ABS_CONST_ADDR
  if (op_array->literals) {
    zval *literals = emalloc(sizeof(zval) * op_array->last_literal);
    memcpy(literals, op_array->literals, sizeof(zval) * op_array->last_literal);
    op_array->literals = literals;
  }
#endif

  op_array->fn_flags &= ~ZEND_ACC_DONE_PASS_TWO;
}

static void zend_redo_pass_two(zend_op_array *op_array)
{
  zend_op *opline, *end;
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
  zend_op *old_opcodes = op_array->opcodes;
#endif

  ZEND_ASSERT((op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) == 0);

#if !ZEND_USE_ABS_CONST_ADDR
  if (op_array->last_literal) {
    op_array->opcodes = (zend_op *) erealloc(op_array->opcodes,
      ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
      sizeof(zval) * op_array->last_literal);
    memcpy(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16),
      op_array->literals, sizeof(zval) * op_array->last_literal);
    efree(op_array->literals);
    op_array->literals = (zval*)(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
  } else {
    if (op_array->literals) {
      efree(op_array->literals);
    }
    op_array->literals = NULL;
  }
#endif

  opline = op_array->opcodes;
  end = opline + op_array->last;
  while (opline < end) {
    if (opline->op1_type == IS_CONST) {
      ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op1);
    }
    if (opline->op2_type == IS_CONST) {
      ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op2);
    }
    /* fix jumps to point to new array */
    switch (opline->opcode) {
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
      case ZEND_JMP:
      case ZEND_FAST_CALL:
        opline->op1.jmp_addr = &op_array->opcodes[opline->op1.jmp_addr - old_opcodes];
        break;
      case ZEND_JMPZ:
      case ZEND_JMPNZ:
      case ZEND_JMPZ_EX:
      case ZEND_JMPNZ_EX:
      case ZEND_JMP_SET:
      case ZEND_COALESCE:
      case ZEND_FE_RESET_R:
      case ZEND_FE_RESET_RW:
      case ZEND_ASSERT_CHECK:
      case ZEND_JMP_NULL:
      case ZEND_BIND_INIT_STATIC_OR_JMP:
      case ZEND_JMP_FRAMELESS:
        opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
        break;
      case ZEND_CATCH:
        if (!(opline->extended_value & ZEND_LAST_CATCH)) {
          opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
        }
        break;
      case ZEND_FE_FETCH_R:
      case ZEND_FE_FETCH_RW:
      case ZEND_SWITCH_LONG:
      case ZEND_SWITCH_STRING:
      case ZEND_MATCH:
        /* relative extended_value don't have to be changed */
        break;
#endif
      case ZEND_IS_IDENTICAL:
      case ZEND_IS_NOT_IDENTICAL:
      case ZEND_IS_EQUAL:
      case ZEND_IS_NOT_EQUAL:
      case ZEND_IS_SMALLER:
      case ZEND_IS_SMALLER_OR_EQUAL:
      case ZEND_CASE:
      case ZEND_CASE_STRICT:
      case ZEND_ISSET_ISEMPTY_CV:
      case ZEND_ISSET_ISEMPTY_VAR:
      case ZEND_ISSET_ISEMPTY_DIM_OBJ:
      case ZEND_ISSET_ISEMPTY_PROP_OBJ:
      case ZEND_ISSET_ISEMPTY_STATIC_PROP:
      case ZEND_INSTANCEOF:
      case ZEND_TYPE_CHECK:
      case ZEND_DEFINED:
      case ZEND_IN_ARRAY:
      case ZEND_ARRAY_KEY_EXISTS:
        if (opline->result_type & IS_TMP_VAR) {
          /* reinitialize result_type of smart branch instructions */
          if (opline + 1 < end) {
            if ((opline+1)->opcode == ZEND_JMPZ
             && (opline+1)->op1_type == IS_TMP_VAR
             && (opline+1)->op1.var == opline->result.var) {
              opline->result_type = IS_SMART_BRANCH_JMPZ | IS_TMP_VAR;
            } else if ((opline+1)->opcode == ZEND_JMPNZ
             && (opline+1)->op1_type == IS_TMP_VAR
             && (opline+1)->op1.var == opline->result.var) {
              opline->result_type = IS_SMART_BRANCH_JMPNZ | IS_TMP_VAR;
            }
          }
        }
        break;
    }
    ZEND_VM_SET_OPCODE_HANDLER(opline);
    opline++;
  }

  op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
}

static void zend_redo_pass_two_ex(zend_op_array *op_array, zend_ssa *ssa)
{
  zend_op *opline, *end;
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
  zend_op *old_opcodes = op_array->opcodes;
#endif

  ZEND_ASSERT((op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) == 0);

#if !ZEND_USE_ABS_CONST_ADDR
  if (op_array->last_literal) {
    op_array->opcodes = (zend_op *) erealloc(op_array->opcodes,
      ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
      sizeof(zval) * op_array->last_literal);
    memcpy(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16),
      op_array->literals, sizeof(zval) * op_array->last_literal);
    efree(op_array->literals);
    op_array->literals = (zval*)(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
  } else {
    if (op_array->literals) {
      efree(op_array->literals);
    }
    op_array->literals = NULL;
  }
#endif

  opline = op_array->opcodes;
  end = opline + op_array->last;
  while (opline < end) {
    zend_ssa_op *ssa_op = &ssa->ops[opline - op_array->opcodes];
    uint32_t op1_info = opline->op1_type == IS_UNUSED ? 0 : (OP1_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY));
    uint32_t op2_info = opline->op1_type == IS_UNUSED ? 0 : (OP2_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY));
    uint32_t res_info =
      (opline->opcode == ZEND_PRE_INC ||
       opline->opcode == ZEND_PRE_DEC ||
       opline->opcode == ZEND_POST_INC ||
       opline->opcode == ZEND_POST_DEC) ?
        ((ssa->ops[opline - op_array->opcodes].op1_def >= 0) ? (OP1_DEF_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY)) : MAY_BE_ANY) :
        (opline->result_type == IS_UNUSED ? 0 : (RES_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY)));

    if (opline->op1_type == IS_CONST) {
      ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op1);
    }
    if (opline->op2_type == IS_CONST) {
      ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op2);
    }

    /* fix jumps to point to new array */
    switch (opline->opcode) {
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
      case ZEND_JMP:
      case ZEND_FAST_CALL:
        opline->op1.jmp_addr = &op_array->opcodes[opline->op1.jmp_addr - old_opcodes];
        break;
      case ZEND_JMPZ:
      case ZEND_JMPNZ:
      case ZEND_JMPZ_EX:
      case ZEND_JMPNZ_EX:
      case ZEND_JMP_SET:
      case ZEND_COALESCE:
      case ZEND_FE_RESET_R:
      case ZEND_FE_RESET_RW:
      case ZEND_ASSERT_CHECK:
      case ZEND_JMP_NULL:
      case ZEND_BIND_INIT_STATIC_OR_JMP:
      case ZEND_JMP_FRAMELESS:
        opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
        break;
      case ZEND_CATCH:
        if (!(opline->extended_value & ZEND_LAST_CATCH)) {
          opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
        }
        break;
      case ZEND_FE_FETCH_R:
      case ZEND_FE_FETCH_RW:
      case ZEND_SWITCH_LONG:
      case ZEND_SWITCH_STRING:
      case ZEND_MATCH:
        /* relative extended_value don't have to be changed */
        break;
#endif
      case ZEND_IS_IDENTICAL:
      case ZEND_IS_NOT_IDENTICAL:
      case ZEND_IS_EQUAL:
      case ZEND_IS_NOT_EQUAL:
      case ZEND_IS_SMALLER:
      case ZEND_IS_SMALLER_OR_EQUAL:
      case ZEND_CASE:
      case ZEND_CASE_STRICT:
      case ZEND_ISSET_ISEMPTY_CV:
      case ZEND_ISSET_ISEMPTY_VAR:
      case ZEND_ISSET_ISEMPTY_DIM_OBJ:
      case ZEND_ISSET_ISEMPTY_PROP_OBJ:
      case ZEND_ISSET_ISEMPTY_STATIC_PROP:
      case ZEND_INSTANCEOF:
      case ZEND_TYPE_CHECK:
      case ZEND_DEFINED:
      case ZEND_IN_ARRAY:
      case ZEND_ARRAY_KEY_EXISTS:
        if (opline->result_type & IS_TMP_VAR) {
          /* reinitialize result_type of smart branch instructions */
          if (opline + 1 < end) {
            if ((opline+1)->opcode == ZEND_JMPZ
             && (opline+1)->op1_type == IS_TMP_VAR
             && (opline+1)->op1.var == opline->result.var) {
              opline->result_type = IS_SMART_BRANCH_JMPZ | IS_TMP_VAR;
            } else if ((opline+1)->opcode == ZEND_JMPNZ
             && (opline+1)->op1_type == IS_TMP_VAR
             && (opline+1)->op1.var == opline->result.var) {
              opline->result_type = IS_SMART_BRANCH_JMPNZ | IS_TMP_VAR;
            }
          }
        }
        break;
    }
#ifdef ZEND_VERIFY_TYPE_INFERENCE
    if (ssa_op->op1_use >= 0) {
      opline->op1_use_type = ssa->var_info[ssa_op->op1_use].type;
    }
    if (ssa_op->op2_use >= 0) {
      opline->op2_use_type = ssa->var_info[ssa_op->op2_use].type;
    }
    if (ssa_op->result_use >= 0) {
      opline->result_use_type = ssa->var_info[ssa_op->result_use].type;
    }
    if (ssa_op->op1_def >= 0) {
      opline->op1_def_type = ssa->var_info[ssa_op->op1_def].type;
    }
    if (ssa_op->op2_def >= 0) {
      opline->op2_def_type = ssa->var_info[ssa_op->op2_def].type;
    }
    if (ssa_op->result_def >= 0) {
      opline->result_def_type = ssa->var_info[ssa_op->result_def].type;
    }
#endif
    zend_vm_set_opcode_handler_ex(opline, op1_info, op2_info, res_info);
    opline++;
  }

  op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
}

static void zend_optimize_op_array(zend_op_array      *op_array,
                                   zend_optimizer_ctx *ctx)
{
  /* Revert pass_two() */
  zend_revert_pass_two(op_array);

  /* Do actual optimizations */
  zend_optimize(op_array, ctx);

  /* Redo pass_two() */
  zend_redo_pass_two(op_array);

  if (op_array->live_range) {
    zend_recalc_live_ranges(op_array, NULL);
  }
}

static void zend_adjust_fcall_stack_size(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
  zend_function *func;
  zend_op *opline, *end;

  opline = op_array->opcodes;
  end = opline + op_array->last;
  while (opline < end) {
    if (opline->opcode == ZEND_INIT_FCALL) {
      func = zend_hash_find_ptr(
        &ctx->script->function_table,
        Z_STR_P(RT_CONSTANT(opline, opline->op2)));
      if (func) {
        opline->op1.num = zend_vm_calc_used_stack(opline->extended_value, func);
      }
    }
    opline++;
  }
}

static void zend_adjust_fcall_stack_size_graph(zend_op_array *op_array)
{
  zend_func_info *func_info = ZEND_FUNC_INFO(op_array);

  if (func_info) {
    zend_call_info *call_info =func_info->callee_info;

    while (call_info) {
      zend_op *opline = call_info->caller_init_opline;

      if (opline && call_info->callee_func && opline->opcode == ZEND_INIT_FCALL) {
        ZEND_ASSERT(!call_info->is_prototype);
        opline->op1.num = zend_vm_calc_used_stack(opline->extended_value, call_info->callee_func);
      }
      call_info = call_info->next_callee;
    }
  }
}

static bool needs_live_range(zend_op_array *op_array, zend_op *def_opline) {
  zend_func_info *func_info = ZEND_FUNC_INFO(op_array);
  zend_ssa_op *ssa_op = &func_info->ssa.ops[def_opline - op_array->opcodes];
  int ssa_var = ssa_op->result_def;
  if (ssa_var < 0) {
    /* Be conservative. */
    return true;
  }

  /* If the variable is used by a PHI, this may be the assignment of the final branch of a
   * ternary/etc structure. While this is where the live range starts, the value from the other
   * branch may also be used. As such, use the type of the PHI node for the following check. */
  if (func_info->ssa.vars[ssa_var].phi_use_chain) {
    ssa_var = func_info->ssa.vars[ssa_var].phi_use_chain->ssa_var;
  }

  uint32_t type = func_info->ssa.var_info[ssa_var].type;
  return (type & (MAY_BE_STRING|MAY_BE_ARRAY|MAY_BE_OBJECT|MAY_BE_RESOURCE|MAY_BE_REF)) != 0;
}

static void zend_foreach_op_array_helper(
    zend_op_array *op_array, zend_op_array_func_t func, void *context) {
  func(op_array, context);
  for (uint32_t i = 0; i < op_array->num_dynamic_func_defs; i++) {
    zend_foreach_op_array_helper(op_array->dynamic_func_defs[i], func, context);
  }
}

void zend_foreach_op_array(zend_script *script, zend_op_array_func_t func, void *context)
{
  zval *zv;
  zend_op_array *op_array;

  zend_foreach_op_array_helper(&script->main_op_array, func, context);

  ZEND_HASH_MAP_FOREACH_PTR(&script->function_table, op_array) {
    zend_foreach_op_array_helper(op_array, func, context);
  } ZEND_HASH_FOREACH_END();

  ZEND_HASH_MAP_FOREACH_VAL(&script->class_table, zv) {
    if (Z_TYPE_P(zv) == IS_ALIAS_PTR) {
      continue;
    }
    zend_class_entry *ce = Z_CE_P(zv);
    ZEND_HASH_MAP_FOREACH_PTR(&ce->function_table, op_array) {
      if (op_array->scope == ce
          && op_array->type == ZEND_USER_FUNCTION
          && !(op_array->fn_flags & ZEND_ACC_ABSTRACT)
          && !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)) {
        zend_foreach_op_array_helper(op_array, func, context);
      }
    } ZEND_HASH_FOREACH_END();

    zend_property_info *property;
    ZEND_HASH_MAP_FOREACH_PTR(&ce->properties_info, property) {
      zend_function **hooks = property->hooks;
      if (property->ce == ce && property->hooks) {
        for (uint32_t i = 0; i < ZEND_PROPERTY_HOOK_COUNT; i++) {
          zend_function *hook = hooks[i];
          if (hook && hook->common.scope == ce && !(hooks[i]->op_array.fn_flags & ZEND_ACC_TRAIT_CLONE)) {
            zend_foreach_op_array_helper(&hooks[i]->op_array, func, context);
          }
        }
      }
    } ZEND_HASH_FOREACH_END();
  } ZEND_HASH_FOREACH_END();
}

static void step_optimize_op_array(zend_op_array *op_array, void *context) {
  zend_optimize_op_array(op_array, (zend_optimizer_ctx *) context);
}

static void step_adjust_fcall_stack_size(zend_op_array *op_array, void *context) {
  zend_adjust_fcall_stack_size(op_array, (zend_optimizer_ctx *) context);
}

static void step_dump_after_optimizer(zend_op_array *op_array, void *context) {
  zend_dump_op_array(op_array, ZEND_DUMP_LIVE_RANGES, "after optimizer", NULL);
}

static void zend_optimizer_call_registered_passes(zend_script *script, void *ctx) {
  for (int i = 0; i < zend_optimizer_registered_passes.last; i++) {
    if (!zend_optimizer_registered_passes.pass[i]) {
      continue;
    }

    zend_optimizer_registered_passes.pass[i](script, ctx);
  }
}

ZEND_API void zend_optimize_script(zend_script *script, zend_long optimization_level, zend_long debug_level)
{
  zend_op_array *op_array;
  zend_string *name;
  zend_optimizer_ctx ctx;
  zval *zv;

  ctx.arena = zend_arena_create(64 * 1024);
  ctx.script = script;
  ctx.constants = NULL;
  ctx.optimization_level = optimization_level;
  ctx.debug_level = debug_level;

  if ((ZEND_OPTIMIZER_PASS_6 & optimization_level) &&
      (ZEND_OPTIMIZER_PASS_7 & optimization_level)) {
    /* Optimize using call-graph */
    zend_call_graph call_graph;
    zend_build_call_graph(&ctx.arena, script, &call_graph);

    int i;
    zend_func_info *func_info;

    for (i = 0; i < call_graph.op_arrays_count; i++) {
      zend_revert_pass_two(call_graph.op_arrays[i]);
      zend_optimize(call_graph.op_arrays[i], &ctx);
    }

      zend_analyze_call_graph(&ctx.arena, script, &call_graph);

    for (i = 0; i < call_graph.op_arrays_count; i++) {
      func_info = ZEND_FUNC_INFO(call_graph.op_arrays[i]);
      if (func_info) {
        func_info->call_map = zend_build_call_map(&ctx.arena, func_info, call_graph.op_arrays[i]);
        if (call_graph.op_arrays[i]->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
          zend_init_func_return_info(call_graph.op_arrays[i], script, &func_info->return_info);
        }
      }
    }

    for (i = 0; i < call_graph.op_arrays_count; i++) {
      func_info = ZEND_FUNC_INFO(call_graph.op_arrays[i]);
      if (func_info) {
        if (zend_dfa_analyze_op_array(call_graph.op_arrays[i], &ctx, &func_info->ssa) == SUCCESS) {
          func_info->flags = func_info->ssa.cfg.flags;
        } else {
          ZEND_SET_FUNC_INFO(call_graph.op_arrays[i], NULL);
        }
      }
    }

    //TODO: perform inner-script inference???
    for (i = 0; i < call_graph.op_arrays_count; i++) {
      func_info = ZEND_FUNC_INFO(call_graph.op_arrays[i]);
      if (func_info) {
        zend_dfa_optimize_op_array(call_graph.op_arrays[i], &ctx, &func_info->ssa, func_info->call_map);
      }
    }

    if (debug_level & ZEND_DUMP_AFTER_PASS_7) {
      for (i = 0; i < call_graph.op_arrays_count; i++) {
        zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 7", NULL);
      }
    }

    if (ZEND_OPTIMIZER_PASS_9 & optimization_level) {
      for (i = 0; i < call_graph.op_arrays_count; i++) {
        zend_optimize_temporary_variables(call_graph.op_arrays[i], &ctx);
        if (debug_level & ZEND_DUMP_AFTER_PASS_9) {
          zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 9", NULL);
        }
      }
    }

    if (ZEND_OPTIMIZER_PASS_11 & optimization_level) {
      for (i = 0; i < call_graph.op_arrays_count; i++) {
        zend_optimizer_compact_literals(call_graph.op_arrays[i], &ctx);
        if (debug_level & ZEND_DUMP_AFTER_PASS_11) {
          zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 11", NULL);
        }
      }
    }

    if (ZEND_OPTIMIZER_PASS_13 & optimization_level) {
      for (i = 0; i < call_graph.op_arrays_count; i++) {
        zend_optimizer_compact_vars(call_graph.op_arrays[i]);
        if (debug_level & ZEND_DUMP_AFTER_PASS_13) {
          zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 13", NULL);
        }
      }
    }

    if (ZEND_OPTIMIZER_PASS_12 & optimization_level) {
      for (i = 0; i < call_graph.op_arrays_count; i++) {
        zend_adjust_fcall_stack_size_graph(call_graph.op_arrays[i]);
      }
    }

    for (i = 0; i < call_graph.op_arrays_count; i++) {
      op_array = call_graph.op_arrays[i];
      func_info = ZEND_FUNC_INFO(op_array);
      if (func_info && func_info->ssa.var_info) {
        zend_redo_pass_two_ex(op_array, &func_info->ssa);
        if (op_array->live_range) {
          zend_recalc_live_ranges(op_array, needs_live_range);
        }
      } else {
        zend_redo_pass_two(op_array);
        if (op_array->live_range) {
          zend_recalc_live_ranges(op_array, NULL);
        }
      }
    }

    for (i = 0; i < call_graph.op_arrays_count; i++) {
      ZEND_SET_FUNC_INFO(call_graph.op_arrays[i], NULL);
    }
  } else {
    zend_foreach_op_array(script, step_optimize_op_array, &ctx);

    if (ZEND_OPTIMIZER_PASS_12 & optimization_level) {
      zend_foreach_op_array(script, step_adjust_fcall_stack_size, &ctx);
    }
  }

  ZEND_HASH_MAP_FOREACH_VAL(&script->class_table, zv) {
    if (Z_TYPE_P(zv) == IS_ALIAS_PTR) {
      continue;
    }
    zend_class_entry *ce = Z_CE_P(zv);
    ZEND_HASH_MAP_FOREACH_STR_KEY_PTR(&ce->function_table, name, op_array) {
      if (op_array->scope != ce && op_array->type == ZEND_USER_FUNCTION) {
        zend_op_array *orig_op_array =
          zend_hash_find_ptr(&op_array->scope->function_table, name);

        ZEND_ASSERT(orig_op_array != NULL);
        if (orig_op_array != op_array) {
          uint32_t fn_flags = op_array->fn_flags;
          zend_function *prototype = op_array->prototype;
          HashTable *ht = op_array->static_variables;

          *op_array = *orig_op_array;
          op_array->fn_flags = fn_flags;
          op_array->prototype = prototype;
          op_array->static_variables = ht;
        }
      }
    } ZEND_HASH_FOREACH_END();
  } ZEND_HASH_FOREACH_END();

  zend_optimizer_call_registered_passes(script, &ctx);

  if ((debug_level & ZEND_DUMP_AFTER_OPTIMIZER) &&
      (ZEND_OPTIMIZER_PASS_7 & optimization_level)) {
    zend_foreach_op_array(script, step_dump_after_optimizer, NULL);
  }

  if (ctx.constants) {
    zend_hash_destroy(ctx.constants);
  }
  zend_arena_destroy(ctx.arena);
}

ZEND_API int zend_optimizer_register_pass(zend_optimizer_pass_t pass)
{
  if (!pass) {
    return -1;
  }

  if (zend_optimizer_registered_passes.last == ZEND_OPTIMIZER_MAX_REGISTERED_PASSES) {
    return -1;
  }

  zend_optimizer_registered_passes.pass[
    zend_optimizer_registered_passes.last++] = pass;

  return zend_optimizer_registered_passes.last;
}

ZEND_API void zend_optimizer_unregister_pass(int idx)
{
  zend_optimizer_registered_passes.pass[idx-1] = NULL;
}

zend_result zend_optimizer_startup(void)
{
  return zend_func_info_startup();
}

zend_result zend_optimizer_shutdown(void)
{
  return zend_func_info_shutdown();
}

Coverage Report

Created: 2025-09-27 06:26